^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Analog Devices LTC2983 Multi-Sensor Digital Temperature Measurement System
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright 2019 Analog Devices Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/bitfield.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/of_gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/spi/spi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /* register map */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define LTC2983_STATUS_REG 0x0000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define LTC2983_TEMP_RES_START_REG 0x0010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define LTC2983_TEMP_RES_END_REG 0x005F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define LTC2983_GLOBAL_CONFIG_REG 0x00F0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define LTC2983_MULT_CHANNEL_START_REG 0x00F4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define LTC2983_MULT_CHANNEL_END_REG 0x00F7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define LTC2983_MUX_CONFIG_REG 0x00FF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define LTC2983_CHAN_ASSIGN_START_REG 0x0200
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define LTC2983_CHAN_ASSIGN_END_REG 0x024F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define LTC2983_CUST_SENS_TBL_START_REG 0x0250
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define LTC2983_CUST_SENS_TBL_END_REG 0x03CF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define LTC2983_DIFFERENTIAL_CHAN_MIN 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define LTC2983_MAX_CHANNELS_NR 20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define LTC2983_MIN_CHANNELS_NR 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define LTC2983_SLEEP 0x97
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define LTC2983_CUSTOM_STEINHART_SIZE 24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define LTC2983_CUSTOM_SENSOR_ENTRY_SZ 6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define LTC2983_CUSTOM_STEINHART_ENTRY_SZ 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define LTC2983_CHAN_START_ADDR(chan) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) (((chan - 1) * 4) + LTC2983_CHAN_ASSIGN_START_REG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define LTC2983_CHAN_RES_ADDR(chan) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) (((chan - 1) * 4) + LTC2983_TEMP_RES_START_REG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #define LTC2983_THERMOCOUPLE_DIFF_MASK BIT(3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define LTC2983_THERMOCOUPLE_SGL(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) FIELD_PREP(LTC2983_THERMOCOUPLE_DIFF_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define LTC2983_THERMOCOUPLE_OC_CURR_MASK GENMASK(1, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #define LTC2983_THERMOCOUPLE_OC_CURR(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) FIELD_PREP(LTC2983_THERMOCOUPLE_OC_CURR_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #define LTC2983_THERMOCOUPLE_OC_CHECK_MASK BIT(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define LTC2983_THERMOCOUPLE_OC_CHECK(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) FIELD_PREP(LTC2983_THERMOCOUPLE_OC_CHECK_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #define LTC2983_THERMISTOR_DIFF_MASK BIT(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #define LTC2983_THERMISTOR_SGL(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) FIELD_PREP(LTC2983_THERMISTOR_DIFF_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #define LTC2983_THERMISTOR_R_SHARE_MASK BIT(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #define LTC2983_THERMISTOR_R_SHARE(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) FIELD_PREP(LTC2983_THERMISTOR_R_SHARE_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #define LTC2983_THERMISTOR_C_ROTATE_MASK BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #define LTC2983_THERMISTOR_C_ROTATE(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) FIELD_PREP(LTC2983_THERMISTOR_C_ROTATE_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #define LTC2983_DIODE_DIFF_MASK BIT(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #define LTC2983_DIODE_SGL(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) FIELD_PREP(LTC2983_DIODE_DIFF_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #define LTC2983_DIODE_3_CONV_CYCLE_MASK BIT(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #define LTC2983_DIODE_3_CONV_CYCLE(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) FIELD_PREP(LTC2983_DIODE_3_CONV_CYCLE_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #define LTC2983_DIODE_AVERAGE_ON_MASK BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #define LTC2983_DIODE_AVERAGE_ON(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) FIELD_PREP(LTC2983_DIODE_AVERAGE_ON_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #define LTC2983_RTD_4_WIRE_MASK BIT(3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #define LTC2983_RTD_ROTATION_MASK BIT(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #define LTC2983_RTD_C_ROTATE(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) FIELD_PREP(LTC2983_RTD_ROTATION_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #define LTC2983_RTD_KELVIN_R_SENSE_MASK GENMASK(3, 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #define LTC2983_RTD_N_WIRES_MASK GENMASK(3, 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #define LTC2983_RTD_N_WIRES(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) FIELD_PREP(LTC2983_RTD_N_WIRES_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) #define LTC2983_RTD_R_SHARE_MASK BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #define LTC2983_RTD_R_SHARE(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) FIELD_PREP(LTC2983_RTD_R_SHARE_MASK, 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #define LTC2983_COMMON_HARD_FAULT_MASK GENMASK(31, 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) #define LTC2983_COMMON_SOFT_FAULT_MASK GENMASK(27, 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #define LTC2983_STATUS_START_MASK BIT(7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) #define LTC2983_STATUS_START(x) FIELD_PREP(LTC2983_STATUS_START_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) #define LTC2983_STATUS_UP_MASK GENMASK(7, 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #define LTC2983_STATUS_UP(reg) FIELD_GET(LTC2983_STATUS_UP_MASK, reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) #define LTC2983_STATUS_CHAN_SEL_MASK GENMASK(4, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #define LTC2983_STATUS_CHAN_SEL(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) FIELD_PREP(LTC2983_STATUS_CHAN_SEL_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) #define LTC2983_TEMP_UNITS_MASK BIT(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #define LTC2983_TEMP_UNITS(x) FIELD_PREP(LTC2983_TEMP_UNITS_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #define LTC2983_NOTCH_FREQ_MASK GENMASK(1, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #define LTC2983_NOTCH_FREQ(x) FIELD_PREP(LTC2983_NOTCH_FREQ_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #define LTC2983_RES_VALID_MASK BIT(24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #define LTC2983_DATA_MASK GENMASK(23, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) #define LTC2983_DATA_SIGN_BIT 23
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #define LTC2983_CHAN_TYPE_MASK GENMASK(31, 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) #define LTC2983_CHAN_TYPE(x) FIELD_PREP(LTC2983_CHAN_TYPE_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /* cold junction for thermocouples and rsense for rtd's and thermistor's */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) #define LTC2983_CHAN_ASSIGN_MASK GENMASK(26, 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #define LTC2983_CHAN_ASSIGN(x) FIELD_PREP(LTC2983_CHAN_ASSIGN_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) #define LTC2983_CUSTOM_LEN_MASK GENMASK(5, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #define LTC2983_CUSTOM_LEN(x) FIELD_PREP(LTC2983_CUSTOM_LEN_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) #define LTC2983_CUSTOM_ADDR_MASK GENMASK(11, 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) #define LTC2983_CUSTOM_ADDR(x) FIELD_PREP(LTC2983_CUSTOM_ADDR_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #define LTC2983_THERMOCOUPLE_CFG_MASK GENMASK(21, 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) #define LTC2983_THERMOCOUPLE_CFG(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) FIELD_PREP(LTC2983_THERMOCOUPLE_CFG_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) #define LTC2983_THERMOCOUPLE_HARD_FAULT_MASK GENMASK(31, 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) #define LTC2983_THERMOCOUPLE_SOFT_FAULT_MASK GENMASK(28, 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) #define LTC2983_RTD_CFG_MASK GENMASK(21, 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) #define LTC2983_RTD_CFG(x) FIELD_PREP(LTC2983_RTD_CFG_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) #define LTC2983_RTD_EXC_CURRENT_MASK GENMASK(17, 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) #define LTC2983_RTD_EXC_CURRENT(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) FIELD_PREP(LTC2983_RTD_EXC_CURRENT_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #define LTC2983_RTD_CURVE_MASK GENMASK(13, 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) #define LTC2983_RTD_CURVE(x) FIELD_PREP(LTC2983_RTD_CURVE_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #define LTC2983_THERMISTOR_CFG_MASK GENMASK(21, 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) #define LTC2983_THERMISTOR_CFG(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) FIELD_PREP(LTC2983_THERMISTOR_CFG_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) #define LTC2983_THERMISTOR_EXC_CURRENT_MASK GENMASK(18, 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) #define LTC2983_THERMISTOR_EXC_CURRENT(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) FIELD_PREP(LTC2983_THERMISTOR_EXC_CURRENT_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #define LTC2983_DIODE_CFG_MASK GENMASK(26, 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) #define LTC2983_DIODE_CFG(x) FIELD_PREP(LTC2983_DIODE_CFG_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) #define LTC2983_DIODE_EXC_CURRENT_MASK GENMASK(23, 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) #define LTC2983_DIODE_EXC_CURRENT(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) FIELD_PREP(LTC2983_DIODE_EXC_CURRENT_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) #define LTC2983_DIODE_IDEAL_FACTOR_MASK GENMASK(21, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) #define LTC2983_DIODE_IDEAL_FACTOR(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) FIELD_PREP(LTC2983_DIODE_IDEAL_FACTOR_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) #define LTC2983_R_SENSE_VAL_MASK GENMASK(26, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) #define LTC2983_R_SENSE_VAL(x) FIELD_PREP(LTC2983_R_SENSE_VAL_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) #define LTC2983_ADC_SINGLE_ENDED_MASK BIT(26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) #define LTC2983_ADC_SINGLE_ENDED(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) FIELD_PREP(LTC2983_ADC_SINGLE_ENDED_MASK, x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) LTC2983_SENSOR_THERMOCOUPLE = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) LTC2983_SENSOR_THERMOCOUPLE_CUSTOM = 9,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) LTC2983_SENSOR_RTD = 10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) LTC2983_SENSOR_RTD_CUSTOM = 18,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) LTC2983_SENSOR_THERMISTOR = 19,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) LTC2983_SENSOR_THERMISTOR_STEINHART = 26,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) LTC2983_SENSOR_THERMISTOR_CUSTOM = 27,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) LTC2983_SENSOR_DIODE = 28,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) LTC2983_SENSOR_SENSE_RESISTOR = 29,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) LTC2983_SENSOR_DIRECT_ADC = 30,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) #define to_thermocouple(_sensor) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) container_of(_sensor, struct ltc2983_thermocouple, sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) #define to_rtd(_sensor) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) container_of(_sensor, struct ltc2983_rtd, sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) #define to_thermistor(_sensor) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) container_of(_sensor, struct ltc2983_thermistor, sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) #define to_diode(_sensor) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) container_of(_sensor, struct ltc2983_diode, sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) #define to_rsense(_sensor) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) container_of(_sensor, struct ltc2983_rsense, sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) #define to_adc(_sensor) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) container_of(_sensor, struct ltc2983_adc, sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) struct ltc2983_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct spi_device *spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) struct mutex lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct completion completion;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct iio_chan_spec *iio_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct ltc2983_sensor **sensors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) u32 mux_delay_config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) u32 filter_notch_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) u16 custom_table_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) u8 num_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) u8 iio_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * DMA (thus cache coherency maintenance) requires the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * transfer buffers to live in their own cache lines.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * Holds the converted temperature
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) __be32 temp ____cacheline_aligned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) struct ltc2983_sensor {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int (*fault_handler)(const struct ltc2983_data *st, const u32 result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) int (*assign_chan)(struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) const struct ltc2983_sensor *sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) /* specifies the sensor channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) u32 chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) /* sensor type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) u32 type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) struct ltc2983_custom_sensor {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) /* raw table sensor data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) u8 *table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) /* address offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) s8 offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) bool is_steinhart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) struct ltc2983_thermocouple {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) struct ltc2983_sensor sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) struct ltc2983_custom_sensor *custom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) u32 sensor_config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) u32 cold_junction_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) struct ltc2983_rtd {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) struct ltc2983_sensor sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) struct ltc2983_custom_sensor *custom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) u32 sensor_config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) u32 r_sense_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) u32 excitation_current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) u32 rtd_curve;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) struct ltc2983_thermistor {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) struct ltc2983_sensor sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) struct ltc2983_custom_sensor *custom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) u32 sensor_config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) u32 r_sense_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) u32 excitation_current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) struct ltc2983_diode {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct ltc2983_sensor sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) u32 sensor_config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) u32 excitation_current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) u32 ideal_factor_value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) struct ltc2983_rsense {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) struct ltc2983_sensor sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) u32 r_sense_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) struct ltc2983_adc {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) struct ltc2983_sensor sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) bool single_ended;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * Convert to Q format numbers. These number's are integers where
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * the number of integer and fractional bits are specified. The resolution
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * is given by 1/@resolution and tell us the number of fractional bits. For
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * instance a resolution of 2^-10 means we have 10 fractional bits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static u32 __convert_to_raw(const u64 val, const u32 resolution)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) u64 __res = val * resolution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /* all values are multiplied by 1000000 to remove the fraction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) do_div(__res, 1000000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return __res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) static u32 __convert_to_raw_sign(const u64 val, const u32 resolution)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) s64 __res = -(s32)val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) __res = __convert_to_raw(__res, resolution);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return (u32)-__res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) static int __ltc2983_fault_handler(const struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) const u32 result, const u32 hard_mask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) const u32 soft_mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) const struct device *dev = &st->spi->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (result & hard_mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) dev_err(dev, "Invalid conversion: Sensor HARD fault\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) } else if (result & soft_mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) /* just print a warning */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) dev_warn(dev, "Suspicious conversion: Sensor SOFT fault\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static int __ltc2983_chan_assign_common(const struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) const struct ltc2983_sensor *sensor,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) u32 chan_val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) u32 reg = LTC2983_CHAN_START_ADDR(sensor->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) __be32 __chan_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) chan_val |= LTC2983_CHAN_TYPE(sensor->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) dev_dbg(&st->spi->dev, "Assign reg:0x%04X, val:0x%08X\n", reg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) chan_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) __chan_val = cpu_to_be32(chan_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) return regmap_bulk_write(st->regmap, reg, &__chan_val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) sizeof(__chan_val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) static int __ltc2983_chan_custom_sensor_assign(struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) struct ltc2983_custom_sensor *custom,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) u32 *chan_val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) u32 reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) u8 mult = custom->is_steinhart ? LTC2983_CUSTOM_STEINHART_ENTRY_SZ :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) LTC2983_CUSTOM_SENSOR_ENTRY_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) const struct device *dev = &st->spi->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) * custom->size holds the raw size of the table. However, when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) * configuring the sensor channel, we must write the number of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * entries of the table minus 1. For steinhart sensors 0 is written
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * since the size is constant!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) const u8 len = custom->is_steinhart ? 0 :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) (custom->size / LTC2983_CUSTOM_SENSOR_ENTRY_SZ) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * Check if the offset was assigned already. It should be for steinhart
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * sensors. When coming from sleep, it should be assigned for all.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if (custom->offset < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * This needs to be done again here because, from the moment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * when this test was done (successfully) for this custom
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * sensor, a steinhart sensor might have been added changing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * custom_table_size...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (st->custom_table_size + custom->size >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) (LTC2983_CUST_SENS_TBL_END_REG -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) LTC2983_CUST_SENS_TBL_START_REG) + 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) dev_err(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) "Not space left(%d) for new custom sensor(%zu)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) st->custom_table_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) custom->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) custom->offset = st->custom_table_size /
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) LTC2983_CUSTOM_SENSOR_ENTRY_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) st->custom_table_size += custom->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) reg = (custom->offset * mult) + LTC2983_CUST_SENS_TBL_START_REG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) *chan_val |= LTC2983_CUSTOM_LEN(len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) *chan_val |= LTC2983_CUSTOM_ADDR(custom->offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) dev_dbg(dev, "Assign custom sensor, reg:0x%04X, off:%d, sz:%zu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) reg, custom->offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) custom->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) /* write custom sensor table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) return regmap_bulk_write(st->regmap, reg, custom->table, custom->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) static struct ltc2983_custom_sensor *__ltc2983_custom_sensor_new(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) const struct device_node *np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) const char *propname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) const bool is_steinhart,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) const u32 resolution,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) const bool has_signed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) struct ltc2983_custom_sensor *new_custom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) u8 index, n_entries, tbl = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) struct device *dev = &st->spi->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) * For custom steinhart, the full u32 is taken. For all the others
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) * the MSB is discarded.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) const u8 n_size = is_steinhart ? 4 : 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) const u8 e_size = is_steinhart ? sizeof(u32) : sizeof(u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) n_entries = of_property_count_elems_of_size(np, propname, e_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) /* n_entries must be an even number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) if (!n_entries || (n_entries % 2) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) dev_err(dev, "Number of entries either 0 or not even\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) new_custom = devm_kzalloc(dev, sizeof(*new_custom), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) if (!new_custom)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) new_custom->size = n_entries * n_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) /* check Steinhart size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (is_steinhart && new_custom->size != LTC2983_CUSTOM_STEINHART_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) dev_err(dev, "Steinhart sensors size(%zu) must be 24",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) new_custom->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) /* Check space on the table. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) if (st->custom_table_size + new_custom->size >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) (LTC2983_CUST_SENS_TBL_END_REG -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) LTC2983_CUST_SENS_TBL_START_REG) + 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) dev_err(dev, "No space left(%d) for new custom sensor(%zu)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) st->custom_table_size, new_custom->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) /* allocate the table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) new_custom->table = devm_kzalloc(dev, new_custom->size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (!new_custom->table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) for (index = 0; index < n_entries; index++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) u64 temp = 0, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) * Steinhart sensors are configured with raw values in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) * devicetree. For the other sensors we must convert the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) * value to raw. The odd index's correspond to temperarures
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) * and always have 1/1024 of resolution. Temperatures also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) * come in kelvin, so signed values is not possible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (!is_steinhart) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) of_property_read_u64_index(np, propname, index, &temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) if ((index % 2) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) temp = __convert_to_raw(temp, 1024);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) else if (has_signed && (s64)temp < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) temp = __convert_to_raw_sign(temp, resolution);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) temp = __convert_to_raw(temp, resolution);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) u32 t32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) of_property_read_u32_index(np, propname, index, &t32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) temp = t32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) for (j = 0; j < n_size; j++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) new_custom->table[tbl++] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) temp >> (8 * (n_size - j - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) new_custom->is_steinhart = is_steinhart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) * This is done to first add all the steinhart sensors to the table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) * in order to maximize the table usage. If we mix adding steinhart
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) * with the other sensors, we might have to do some roundup to make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) * sure that sensor_addr - 0x250(start address) is a multiple of 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) * (for steinhart), and a multiple of 6 for all the other sensors.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) * Since we have const 24 bytes for steinhart sensors and 24 is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) * also a multiple of 6, we guarantee that the first non-steinhart
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) * sensor will sit in a correct address without the need of filling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) * addresses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (is_steinhart) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) new_custom->offset = st->custom_table_size /
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) LTC2983_CUSTOM_STEINHART_ENTRY_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) st->custom_table_size += new_custom->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /* mark as unset. This is checked later on the assign phase */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) new_custom->offset = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) return new_custom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) static int ltc2983_thermocouple_fault_handler(const struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) const u32 result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) return __ltc2983_fault_handler(st, result,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) LTC2983_THERMOCOUPLE_HARD_FAULT_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) LTC2983_THERMOCOUPLE_SOFT_FAULT_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) static int ltc2983_common_fault_handler(const struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) const u32 result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) return __ltc2983_fault_handler(st, result,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) LTC2983_COMMON_HARD_FAULT_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) LTC2983_COMMON_SOFT_FAULT_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) static int ltc2983_thermocouple_assign_chan(struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) struct ltc2983_thermocouple *thermo = to_thermocouple(sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) u32 chan_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) chan_val = LTC2983_CHAN_ASSIGN(thermo->cold_junction_chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) chan_val |= LTC2983_THERMOCOUPLE_CFG(thermo->sensor_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) if (thermo->custom) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) ret = __ltc2983_chan_custom_sensor_assign(st, thermo->custom,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) &chan_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) return __ltc2983_chan_assign_common(st, sensor, chan_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) static int ltc2983_rtd_assign_chan(struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) struct ltc2983_rtd *rtd = to_rtd(sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) u32 chan_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) chan_val = LTC2983_CHAN_ASSIGN(rtd->r_sense_chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) chan_val |= LTC2983_RTD_CFG(rtd->sensor_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) chan_val |= LTC2983_RTD_EXC_CURRENT(rtd->excitation_current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) chan_val |= LTC2983_RTD_CURVE(rtd->rtd_curve);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if (rtd->custom) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) ret = __ltc2983_chan_custom_sensor_assign(st, rtd->custom,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) &chan_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) return __ltc2983_chan_assign_common(st, sensor, chan_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) static int ltc2983_thermistor_assign_chan(struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) struct ltc2983_thermistor *thermistor = to_thermistor(sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) u32 chan_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) chan_val = LTC2983_CHAN_ASSIGN(thermistor->r_sense_chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) chan_val |= LTC2983_THERMISTOR_CFG(thermistor->sensor_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) chan_val |=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) LTC2983_THERMISTOR_EXC_CURRENT(thermistor->excitation_current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) if (thermistor->custom) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) ret = __ltc2983_chan_custom_sensor_assign(st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) thermistor->custom,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) &chan_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) return __ltc2983_chan_assign_common(st, sensor, chan_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) static int ltc2983_diode_assign_chan(struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) struct ltc2983_diode *diode = to_diode(sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) u32 chan_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) chan_val = LTC2983_DIODE_CFG(diode->sensor_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) chan_val |= LTC2983_DIODE_EXC_CURRENT(diode->excitation_current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) chan_val |= LTC2983_DIODE_IDEAL_FACTOR(diode->ideal_factor_value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) return __ltc2983_chan_assign_common(st, sensor, chan_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) static int ltc2983_r_sense_assign_chan(struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) struct ltc2983_rsense *rsense = to_rsense(sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) u32 chan_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) chan_val = LTC2983_R_SENSE_VAL(rsense->r_sense_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) return __ltc2983_chan_assign_common(st, sensor, chan_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) static int ltc2983_adc_assign_chan(struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) struct ltc2983_adc *adc = to_adc(sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) u32 chan_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) chan_val = LTC2983_ADC_SINGLE_ENDED(adc->single_ended);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) return __ltc2983_chan_assign_common(st, sensor, chan_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) static struct ltc2983_sensor *ltc2983_thermocouple_new(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) const struct device_node *child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) struct ltc2983_thermocouple *thermo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) struct device_node *phandle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) u32 oc_current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) thermo = devm_kzalloc(&st->spi->dev, sizeof(*thermo), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) if (!thermo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (of_property_read_bool(child, "adi,single-ended"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) thermo->sensor_config = LTC2983_THERMOCOUPLE_SGL(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) ret = of_property_read_u32(child, "adi,sensor-oc-current-microamp",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) &oc_current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) switch (oc_current) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) case 10:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) thermo->sensor_config |=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) LTC2983_THERMOCOUPLE_OC_CURR(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) case 100:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) thermo->sensor_config |=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) LTC2983_THERMOCOUPLE_OC_CURR(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) case 500:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) thermo->sensor_config |=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) LTC2983_THERMOCOUPLE_OC_CURR(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) case 1000:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) thermo->sensor_config |=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) LTC2983_THERMOCOUPLE_OC_CURR(3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) dev_err(&st->spi->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) "Invalid open circuit current:%u", oc_current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) thermo->sensor_config |= LTC2983_THERMOCOUPLE_OC_CHECK(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) /* validate channel index */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) if (!(thermo->sensor_config & LTC2983_THERMOCOUPLE_DIFF_MASK) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) dev_err(&st->spi->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) "Invalid chann:%d for differential thermocouple",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) sensor->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) phandle = of_parse_phandle(child, "adi,cold-junction-handle", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) if (phandle) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) ret = of_property_read_u32(phandle, "reg",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) &thermo->cold_junction_chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) * This would be catched later but we can just return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) * the error right away.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) dev_err(&st->spi->dev, "Property reg must be given\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) of_node_put(phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) /* check custom sensor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) if (sensor->type == LTC2983_SENSOR_THERMOCOUPLE_CUSTOM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) const char *propname = "adi,custom-thermocouple";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) thermo->custom = __ltc2983_custom_sensor_new(st, child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) propname, false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) 16384, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) if (IS_ERR(thermo->custom)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) of_node_put(phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) return ERR_CAST(thermo->custom);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) /* set common parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) thermo->sensor.fault_handler = ltc2983_thermocouple_fault_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) thermo->sensor.assign_chan = ltc2983_thermocouple_assign_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) of_node_put(phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) return &thermo->sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) static struct ltc2983_sensor *ltc2983_rtd_new(const struct device_node *child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) struct ltc2983_rtd *rtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) struct device *dev = &st->spi->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) struct device_node *phandle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) u32 excitation_current = 0, n_wires = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) rtd = devm_kzalloc(dev, sizeof(*rtd), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) if (!rtd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) phandle = of_parse_phandle(child, "adi,rsense-handle", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) if (!phandle) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) dev_err(dev, "Property adi,rsense-handle missing or invalid");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) ret = of_property_read_u32(phandle, "reg", &rtd->r_sense_chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) dev_err(dev, "Property reg must be given\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) ret = of_property_read_u32(child, "adi,number-of-wires", &n_wires);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) switch (n_wires) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) rtd->sensor_config = LTC2983_RTD_N_WIRES(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) case 3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) rtd->sensor_config = LTC2983_RTD_N_WIRES(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) rtd->sensor_config = LTC2983_RTD_N_WIRES(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) case 5:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) /* 4 wires, Kelvin Rsense */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) rtd->sensor_config = LTC2983_RTD_N_WIRES(3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) dev_err(dev, "Invalid number of wires:%u\n", n_wires);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) if (of_property_read_bool(child, "adi,rsense-share")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) /* Current rotation is only available with rsense sharing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) if (of_property_read_bool(child, "adi,current-rotate")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) if (n_wires == 2 || n_wires == 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) dev_err(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) "Rotation not allowed for 2/3 Wire RTDs");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) rtd->sensor_config |= LTC2983_RTD_C_ROTATE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) rtd->sensor_config |= LTC2983_RTD_R_SHARE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) * rtd channel indexes are a bit more complicated to validate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) * For 4wire RTD with rotation, the channel selection cannot be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) * >=19 since the chann + 1 is used in this configuration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) * For 4wire RTDs with kelvin rsense, the rsense channel cannot be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) * <=1 since chanel - 1 and channel - 2 are used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) if (rtd->sensor_config & LTC2983_RTD_4_WIRE_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) /* 4-wire */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) u8 min = LTC2983_DIFFERENTIAL_CHAN_MIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) max = LTC2983_MAX_CHANNELS_NR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) if (rtd->sensor_config & LTC2983_RTD_ROTATION_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) max = LTC2983_MAX_CHANNELS_NR - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) if (((rtd->sensor_config & LTC2983_RTD_KELVIN_R_SENSE_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) == LTC2983_RTD_KELVIN_R_SENSE_MASK) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) (rtd->r_sense_chan <= min)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) /* kelvin rsense*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) dev_err(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) "Invalid rsense chann:%d to use in kelvin rsense",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) rtd->r_sense_chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) if (sensor->chan < min || sensor->chan > max) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) dev_err(dev, "Invalid chann:%d for the rtd config",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) sensor->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) /* same as differential case */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) dev_err(&st->spi->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) "Invalid chann:%d for RTD", sensor->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) /* check custom sensor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) if (sensor->type == LTC2983_SENSOR_RTD_CUSTOM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) rtd->custom = __ltc2983_custom_sensor_new(st, child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) "adi,custom-rtd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) false, 2048, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) if (IS_ERR(rtd->custom)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) of_node_put(phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) return ERR_CAST(rtd->custom);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) /* set common parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) rtd->sensor.fault_handler = ltc2983_common_fault_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) rtd->sensor.assign_chan = ltc2983_rtd_assign_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) ret = of_property_read_u32(child, "adi,excitation-current-microamp",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) &excitation_current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) /* default to 5uA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) rtd->excitation_current = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) switch (excitation_current) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) case 5:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) rtd->excitation_current = 0x01;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) case 10:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) rtd->excitation_current = 0x02;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) case 25:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) rtd->excitation_current = 0x03;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) case 50:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) rtd->excitation_current = 0x04;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) case 100:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) rtd->excitation_current = 0x05;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) case 250:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) rtd->excitation_current = 0x06;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) case 500:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) rtd->excitation_current = 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) case 1000:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) rtd->excitation_current = 0x08;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) dev_err(&st->spi->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) "Invalid value for excitation current(%u)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) excitation_current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) of_property_read_u32(child, "adi,rtd-curve", &rtd->rtd_curve);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) of_node_put(phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) return &rtd->sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) of_node_put(phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) static struct ltc2983_sensor *ltc2983_thermistor_new(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) const struct device_node *child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) struct ltc2983_thermistor *thermistor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) struct device *dev = &st->spi->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) struct device_node *phandle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) u32 excitation_current = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) thermistor = devm_kzalloc(dev, sizeof(*thermistor), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) if (!thermistor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) phandle = of_parse_phandle(child, "adi,rsense-handle", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) if (!phandle) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) dev_err(dev, "Property adi,rsense-handle missing or invalid");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) ret = of_property_read_u32(phandle, "reg", &thermistor->r_sense_chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) dev_err(dev, "rsense channel must be configured...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) if (of_property_read_bool(child, "adi,single-ended")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) thermistor->sensor_config = LTC2983_THERMISTOR_SGL(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) } else if (of_property_read_bool(child, "adi,rsense-share")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) /* rotation is only possible if sharing rsense */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) if (of_property_read_bool(child, "adi,current-rotate"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) thermistor->sensor_config =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) LTC2983_THERMISTOR_C_ROTATE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) thermistor->sensor_config =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) LTC2983_THERMISTOR_R_SHARE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) /* validate channel index */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) if (!(thermistor->sensor_config & LTC2983_THERMISTOR_DIFF_MASK) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) dev_err(&st->spi->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) "Invalid chann:%d for differential thermistor",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) sensor->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) /* check custom sensor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) if (sensor->type >= LTC2983_SENSOR_THERMISTOR_STEINHART) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) bool steinhart = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) const char *propname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) if (sensor->type == LTC2983_SENSOR_THERMISTOR_STEINHART) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) steinhart = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) propname = "adi,custom-steinhart";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) propname = "adi,custom-thermistor";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) thermistor->custom = __ltc2983_custom_sensor_new(st, child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) propname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) steinhart,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) 64, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) if (IS_ERR(thermistor->custom)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) of_node_put(phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) return ERR_CAST(thermistor->custom);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) /* set common parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) thermistor->sensor.fault_handler = ltc2983_common_fault_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) thermistor->sensor.assign_chan = ltc2983_thermistor_assign_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) ret = of_property_read_u32(child, "adi,excitation-current-nanoamp",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) &excitation_current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) /* Auto range is not allowed for custom sensors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) if (sensor->type >= LTC2983_SENSOR_THERMISTOR_STEINHART)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) /* default to 1uA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) thermistor->excitation_current = 0x03;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) /* default to auto-range */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) thermistor->excitation_current = 0x0c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) switch (excitation_current) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) /* auto range */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) if (sensor->type >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) LTC2983_SENSOR_THERMISTOR_STEINHART) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) dev_err(&st->spi->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) "Auto Range not allowed for custom sensors\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) thermistor->excitation_current = 0x0c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) case 250:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) thermistor->excitation_current = 0x01;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) case 500:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) thermistor->excitation_current = 0x02;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) case 1000:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) thermistor->excitation_current = 0x03;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) case 5000:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) thermistor->excitation_current = 0x04;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) case 10000:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) thermistor->excitation_current = 0x05;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) case 25000:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) thermistor->excitation_current = 0x06;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) case 50000:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) thermistor->excitation_current = 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) case 100000:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) thermistor->excitation_current = 0x08;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) case 250000:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) thermistor->excitation_current = 0x09;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) case 500000:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) thermistor->excitation_current = 0x0a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) case 1000000:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) thermistor->excitation_current = 0x0b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) dev_err(&st->spi->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) "Invalid value for excitation current(%u)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) excitation_current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) of_node_put(phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) return &thermistor->sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) of_node_put(phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) static struct ltc2983_sensor *ltc2983_diode_new(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) const struct device_node *child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) const struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) struct ltc2983_diode *diode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) u32 temp = 0, excitation_current = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) diode = devm_kzalloc(&st->spi->dev, sizeof(*diode), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) if (!diode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) if (of_property_read_bool(child, "adi,single-ended"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) diode->sensor_config = LTC2983_DIODE_SGL(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) if (of_property_read_bool(child, "adi,three-conversion-cycles"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) diode->sensor_config |= LTC2983_DIODE_3_CONV_CYCLE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) if (of_property_read_bool(child, "adi,average-on"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) diode->sensor_config |= LTC2983_DIODE_AVERAGE_ON(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) /* validate channel index */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) if (!(diode->sensor_config & LTC2983_DIODE_DIFF_MASK) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) dev_err(&st->spi->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) "Invalid chann:%d for differential thermistor",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) sensor->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) /* set common parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) diode->sensor.fault_handler = ltc2983_common_fault_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) diode->sensor.assign_chan = ltc2983_diode_assign_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) ret = of_property_read_u32(child, "adi,excitation-current-microamp",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) &excitation_current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) switch (excitation_current) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) case 10:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) diode->excitation_current = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) case 20:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) diode->excitation_current = 0x01;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) case 40:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) diode->excitation_current = 0x02;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) case 80:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) diode->excitation_current = 0x03;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) dev_err(&st->spi->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) "Invalid value for excitation current(%u)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) excitation_current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) of_property_read_u32(child, "adi,ideal-factor-value", &temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) /* 2^20 resolution */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) diode->ideal_factor_value = __convert_to_raw(temp, 1048576);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) return &diode->sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) static struct ltc2983_sensor *ltc2983_r_sense_new(struct device_node *child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) struct ltc2983_rsense *rsense;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) u32 temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) rsense = devm_kzalloc(&st->spi->dev, sizeof(*rsense), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) if (!rsense)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) /* validate channel index */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) dev_err(&st->spi->dev, "Invalid chann:%d for r_sense",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) sensor->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) ret = of_property_read_u32(child, "adi,rsense-val-milli-ohms", &temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) dev_err(&st->spi->dev, "Property adi,rsense-val-milli-ohms missing\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) * Times 1000 because we have milli-ohms and __convert_to_raw
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) * expects scales of 1000000 which are used for all other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) * properties.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) * 2^10 resolution
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) rsense->r_sense_val = __convert_to_raw((u64)temp * 1000, 1024);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) /* set common parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) rsense->sensor.assign_chan = ltc2983_r_sense_assign_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) return &rsense->sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) static struct ltc2983_sensor *ltc2983_adc_new(struct device_node *child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) const struct ltc2983_sensor *sensor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) struct ltc2983_adc *adc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) adc = devm_kzalloc(&st->spi->dev, sizeof(*adc), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) if (!adc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) if (of_property_read_bool(child, "adi,single-ended"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) adc->single_ended = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) if (!adc->single_ended &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) dev_err(&st->spi->dev, "Invalid chan:%d for differential adc\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) sensor->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) /* set common parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) adc->sensor.assign_chan = ltc2983_adc_assign_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) adc->sensor.fault_handler = ltc2983_common_fault_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) return &adc->sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) static int ltc2983_chan_read(struct ltc2983_data *st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) const struct ltc2983_sensor *sensor, int *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) u32 start_conversion = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) unsigned long time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) start_conversion = LTC2983_STATUS_START(true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) start_conversion |= LTC2983_STATUS_CHAN_SEL(sensor->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) dev_dbg(&st->spi->dev, "Start conversion on chan:%d, status:%02X\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) sensor->chan, start_conversion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) /* start conversion */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) ret = regmap_write(st->regmap, LTC2983_STATUS_REG, start_conversion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) reinit_completion(&st->completion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) * wait for conversion to complete.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) * 300 ms should be more than enough to complete the conversion.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) * Depending on the sensor configuration, there are 2/3 conversions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) * cycles of 82ms.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) time = wait_for_completion_timeout(&st->completion,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) msecs_to_jiffies(300));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) if (!time) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) dev_warn(&st->spi->dev, "Conversion timed out\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) return -ETIMEDOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) /* read the converted data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) ret = regmap_bulk_read(st->regmap, LTC2983_CHAN_RES_ADDR(sensor->chan),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) &st->temp, sizeof(st->temp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) *val = __be32_to_cpu(st->temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) if (!(LTC2983_RES_VALID_MASK & *val)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) dev_err(&st->spi->dev, "Invalid conversion detected\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) ret = sensor->fault_handler(st, *val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) *val = sign_extend32((*val) & LTC2983_DATA_MASK, LTC2983_DATA_SIGN_BIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) static int ltc2983_read_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) int *val, int *val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) struct ltc2983_data *st = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) /* sanity check */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) if (chan->address >= st->num_channels) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) dev_err(&st->spi->dev, "Invalid chan address:%ld",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) chan->address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) mutex_lock(&st->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) ret = ltc2983_chan_read(st, st->sensors[chan->address], val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) mutex_unlock(&st->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) return ret ?: IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) case IIO_CHAN_INFO_SCALE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) switch (chan->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) case IIO_TEMP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) /* value in milli degrees */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) *val = 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) /* 2^10 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) *val2 = 1024;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) return IIO_VAL_FRACTIONAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) case IIO_VOLTAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) /* value in millivolt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) *val = 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) /* 2^21 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) *val2 = 2097152;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) return IIO_VAL_FRACTIONAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) static int ltc2983_reg_access(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) unsigned int reg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) unsigned int writeval,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) unsigned int *readval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) struct ltc2983_data *st = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) if (readval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) return regmap_read(st->regmap, reg, readval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) return regmap_write(st->regmap, reg, writeval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) static irqreturn_t ltc2983_irq_handler(int irq, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) struct ltc2983_data *st = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) complete(&st->completion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) #define LTC2983_CHAN(__type, index, __address) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) struct iio_chan_spec __chan = { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) .type = __type, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) .indexed = 1, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) .channel = index, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) .address = __address, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) }; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) __chan; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) static int ltc2983_parse_dt(struct ltc2983_data *st)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) struct device_node *child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) struct device *dev = &st->spi->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) int ret = 0, chan = 0, channel_avail_mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) of_property_read_u32(dev->of_node, "adi,mux-delay-config-us",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) &st->mux_delay_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) of_property_read_u32(dev->of_node, "adi,filter-notch-freq",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) &st->filter_notch_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) st->num_channels = of_get_available_child_count(dev->of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) st->sensors = devm_kcalloc(dev, st->num_channels, sizeof(*st->sensors),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) if (!st->sensors)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) st->iio_channels = st->num_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) for_each_available_child_of_node(dev->of_node, child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) struct ltc2983_sensor sensor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) ret = of_property_read_u32(child, "reg", &sensor.chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) dev_err(dev, "reg property must given for child nodes\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) goto put_child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) /* check if we have a valid channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) if (sensor.chan < LTC2983_MIN_CHANNELS_NR ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) sensor.chan > LTC2983_MAX_CHANNELS_NR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) dev_err(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) "chan:%d must be from 1 to 20\n", sensor.chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) goto put_child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) } else if (channel_avail_mask & BIT(sensor.chan)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) dev_err(dev, "chan:%d already in use\n", sensor.chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) goto put_child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) ret = of_property_read_u32(child, "adi,sensor-type",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) &sensor.type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) dev_err(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) "adi,sensor-type property must given for child nodes\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) goto put_child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) dev_dbg(dev, "Create new sensor, type %u, chann %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) sensor.type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) sensor.chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) if (sensor.type >= LTC2983_SENSOR_THERMOCOUPLE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) sensor.type <= LTC2983_SENSOR_THERMOCOUPLE_CUSTOM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) st->sensors[chan] = ltc2983_thermocouple_new(child, st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) &sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) } else if (sensor.type >= LTC2983_SENSOR_RTD &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) sensor.type <= LTC2983_SENSOR_RTD_CUSTOM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) st->sensors[chan] = ltc2983_rtd_new(child, st, &sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) } else if (sensor.type >= LTC2983_SENSOR_THERMISTOR &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) sensor.type <= LTC2983_SENSOR_THERMISTOR_CUSTOM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) st->sensors[chan] = ltc2983_thermistor_new(child, st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) &sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) } else if (sensor.type == LTC2983_SENSOR_DIODE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) st->sensors[chan] = ltc2983_diode_new(child, st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) &sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) } else if (sensor.type == LTC2983_SENSOR_SENSE_RESISTOR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) st->sensors[chan] = ltc2983_r_sense_new(child, st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) &sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) /* don't add rsense to iio */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) st->iio_channels--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) } else if (sensor.type == LTC2983_SENSOR_DIRECT_ADC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) st->sensors[chan] = ltc2983_adc_new(child, st, &sensor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) dev_err(dev, "Unknown sensor type %d\n", sensor.type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) goto put_child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) if (IS_ERR(st->sensors[chan])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) dev_err(dev, "Failed to create sensor %ld",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) PTR_ERR(st->sensors[chan]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) ret = PTR_ERR(st->sensors[chan]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) goto put_child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) /* set generic sensor parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) st->sensors[chan]->chan = sensor.chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) st->sensors[chan]->type = sensor.type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) channel_avail_mask |= BIT(sensor.chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) chan++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) put_child:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) of_node_put(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) static int ltc2983_setup(struct ltc2983_data *st, bool assign_iio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) u32 iio_chan_t = 0, iio_chan_v = 0, chan, iio_idx = 0, status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) /* make sure the device is up: start bit (7) is 0 and done bit (6) is 1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) ret = regmap_read_poll_timeout(st->regmap, LTC2983_STATUS_REG, status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) LTC2983_STATUS_UP(status) == 1, 25000,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) 25000 * 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) dev_err(&st->spi->dev, "Device startup timed out\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) st->iio_chan = devm_kzalloc(&st->spi->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) st->iio_channels * sizeof(*st->iio_chan),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) if (!st->iio_chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) ret = regmap_update_bits(st->regmap, LTC2983_GLOBAL_CONFIG_REG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) LTC2983_NOTCH_FREQ_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) LTC2983_NOTCH_FREQ(st->filter_notch_freq));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) ret = regmap_write(st->regmap, LTC2983_MUX_CONFIG_REG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) st->mux_delay_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) for (chan = 0; chan < st->num_channels; chan++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) u32 chan_type = 0, *iio_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) ret = st->sensors[chan]->assign_chan(st, st->sensors[chan]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) * The assign_iio flag is necessary for when the device is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) * coming out of sleep. In that case, we just need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) * re-configure the device channels.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) * We also don't assign iio channels for rsense.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) if (st->sensors[chan]->type == LTC2983_SENSOR_SENSE_RESISTOR ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) !assign_iio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) /* assign iio channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) if (st->sensors[chan]->type != LTC2983_SENSOR_DIRECT_ADC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) chan_type = IIO_TEMP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) iio_chan = &iio_chan_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) chan_type = IIO_VOLTAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) iio_chan = &iio_chan_v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) * add chan as the iio .address so that, we can directly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) * reference the sensor given the iio_chan_spec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) st->iio_chan[iio_idx++] = LTC2983_CHAN(chan_type, (*iio_chan)++,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) static const struct regmap_range ltc2983_reg_ranges[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) regmap_reg_range(LTC2983_STATUS_REG, LTC2983_STATUS_REG),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) regmap_reg_range(LTC2983_TEMP_RES_START_REG, LTC2983_TEMP_RES_END_REG),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) regmap_reg_range(LTC2983_GLOBAL_CONFIG_REG, LTC2983_GLOBAL_CONFIG_REG),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) regmap_reg_range(LTC2983_MULT_CHANNEL_START_REG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) LTC2983_MULT_CHANNEL_END_REG),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) regmap_reg_range(LTC2983_MUX_CONFIG_REG, LTC2983_MUX_CONFIG_REG),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) regmap_reg_range(LTC2983_CHAN_ASSIGN_START_REG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) LTC2983_CHAN_ASSIGN_END_REG),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) regmap_reg_range(LTC2983_CUST_SENS_TBL_START_REG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) LTC2983_CUST_SENS_TBL_END_REG),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) static const struct regmap_access_table ltc2983_reg_table = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) .yes_ranges = ltc2983_reg_ranges,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) .n_yes_ranges = ARRAY_SIZE(ltc2983_reg_ranges),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) * The reg_bits are actually 12 but the device needs the first *complete*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) * byte for the command (R/W).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) static const struct regmap_config ltc2983_regmap_config = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) .reg_bits = 24,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) .val_bits = 8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) .wr_table = <c2983_reg_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) .rd_table = <c2983_reg_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) .read_flag_mask = GENMASK(1, 0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) .write_flag_mask = BIT(1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) static const struct iio_info ltc2983_iio_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) .read_raw = ltc2983_read_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) .debugfs_reg_access = ltc2983_reg_access,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) static int ltc2983_probe(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) struct ltc2983_data *st;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) struct iio_dev *indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) const char *name = spi_get_device_id(spi)->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) if (!indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) st = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) st->regmap = devm_regmap_init_spi(spi, <c2983_regmap_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) if (IS_ERR(st->regmap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) dev_err(&spi->dev, "Failed to initialize regmap\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) return PTR_ERR(st->regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) mutex_init(&st->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) init_completion(&st->completion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) st->spi = spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) spi_set_drvdata(spi, st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) ret = ltc2983_parse_dt(st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) ret = ltc2983_setup(st, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) ret = devm_request_irq(&spi->dev, spi->irq, ltc2983_irq_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) IRQF_TRIGGER_RISING, name, st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) dev_err(&spi->dev, "failed to request an irq, %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) indio_dev->name = name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) indio_dev->num_channels = st->iio_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) indio_dev->channels = st->iio_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) indio_dev->modes = INDIO_DIRECT_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) indio_dev->info = <c2983_iio_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) return devm_iio_device_register(&spi->dev, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) static int __maybe_unused ltc2983_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) struct ltc2983_data *st = spi_get_drvdata(to_spi_device(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) int dummy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) /* dummy read to bring the device out of sleep */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) regmap_read(st->regmap, LTC2983_STATUS_REG, &dummy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) /* we need to re-assign the channels */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) return ltc2983_setup(st, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) static int __maybe_unused ltc2983_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) struct ltc2983_data *st = spi_get_drvdata(to_spi_device(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) return regmap_write(st->regmap, LTC2983_STATUS_REG, LTC2983_SLEEP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) static SIMPLE_DEV_PM_OPS(ltc2983_pm_ops, ltc2983_suspend, ltc2983_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) static const struct spi_device_id ltc2983_id_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) { "ltc2983" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) MODULE_DEVICE_TABLE(spi, ltc2983_id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543) static const struct of_device_id ltc2983_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) { .compatible = "adi,ltc2983" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) MODULE_DEVICE_TABLE(of, ltc2983_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549) static struct spi_driver ltc2983_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) .name = "ltc2983",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552) .of_match_table = ltc2983_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) .pm = <c2983_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) .probe = ltc2983_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) .id_table = ltc2983_id_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559) module_spi_driver(ltc2983_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) MODULE_AUTHOR("Nuno Sa <nuno.sa@analog.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) MODULE_DESCRIPTION("Analog Devices LTC2983 SPI Temperature sensors");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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