^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * 1-Wire implementation for the ds2438 chip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2017 Mariusz Bialonczyk <manio@skyboo.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.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/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/w1.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define W1_FAMILY_DS2438 0x26
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define W1_DS2438_RETRIES 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /* Memory commands */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define W1_DS2438_READ_SCRATCH 0xBE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define W1_DS2438_WRITE_SCRATCH 0x4E
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define W1_DS2438_COPY_SCRATCH 0x48
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define W1_DS2438_RECALL_MEMORY 0xB8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /* Register commands */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define W1_DS2438_CONVERT_TEMP 0x44
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define W1_DS2438_CONVERT_VOLTAGE 0xB4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define DS2438_PAGE_SIZE 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define DS2438_ADC_INPUT_VAD 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define DS2438_ADC_INPUT_VDD 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define DS2438_MAX_CONVERSION_TIME 10 /* ms */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /* Page #0 definitions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define DS2438_STATUS_REG 0x00 /* Status/Configuration Register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define DS2438_STATUS_IAD (1 << 0) /* Current A/D Control Bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define DS2438_STATUS_CA (1 << 1) /* Current Accumulator Configuration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define DS2438_STATUS_EE (1 << 2) /* Current Accumulator Shadow Selector bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define DS2438_STATUS_AD (1 << 3) /* Voltage A/D Input Select Bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define DS2438_STATUS_TB (1 << 4) /* Temperature Busy Flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define DS2438_STATUS_NVB (1 << 5) /* Nonvolatile Memory Busy Flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define DS2438_STATUS_ADB (1 << 6) /* A/D Converter Busy Flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define DS2438_TEMP_LSB 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #define DS2438_TEMP_MSB 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define DS2438_VOLTAGE_LSB 0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define DS2438_VOLTAGE_MSB 0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define DS2438_CURRENT_LSB 0x05
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #define DS2438_CURRENT_MSB 0x06
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #define DS2438_THRESHOLD 0x07
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static int w1_ds2438_get_page(struct w1_slave *sl, int pageno, u8 *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) unsigned int retries = W1_DS2438_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) u8 w1_buf[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) u8 crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) size_t count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) while (retries--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) crc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) w1_buf[0] = W1_DS2438_RECALL_MEMORY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) w1_buf[1] = (u8)pageno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) w1_write_block(sl->master, w1_buf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) w1_buf[0] = W1_DS2438_READ_SCRATCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) w1_buf[1] = (u8)pageno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) w1_write_block(sl->master, w1_buf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) count = w1_read_block(sl->master, buf, DS2438_PAGE_SIZE + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (count == DS2438_PAGE_SIZE + 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) crc = w1_calc_crc8(buf, DS2438_PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /* check for correct CRC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if ((u8)buf[DS2438_PAGE_SIZE] == crc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) static int w1_ds2438_get_temperature(struct w1_slave *sl, int16_t *temperature)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) unsigned int retries = W1_DS2438_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) u8 w1_buf[DS2438_PAGE_SIZE + 1 /*for CRC*/];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) unsigned int tm = DS2438_MAX_CONVERSION_TIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) unsigned long sleep_rem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) while (retries--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) w1_write_8(sl->master, W1_DS2438_CONVERT_TEMP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) sleep_rem = msleep_interruptible(tm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (sleep_rem != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) goto post_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (mutex_lock_interruptible(&sl->master->bus_mutex) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) goto post_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (w1_ds2438_get_page(sl, 0, w1_buf) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) *temperature = (((int16_t) w1_buf[DS2438_TEMP_MSB]) << 8) | ((uint16_t) w1_buf[DS2438_TEMP_LSB]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) post_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static int w1_ds2438_change_config_bit(struct w1_slave *sl, u8 mask, u8 value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) unsigned int retries = W1_DS2438_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) u8 w1_buf[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) u8 status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) int perform_write = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) while (retries--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) w1_buf[0] = W1_DS2438_RECALL_MEMORY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) w1_buf[1] = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) w1_write_block(sl->master, w1_buf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) w1_buf[0] = W1_DS2438_READ_SCRATCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) w1_buf[1] = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) w1_write_block(sl->master, w1_buf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* reading one byte of result */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) status = w1_read_8(sl->master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /* if bit0=1, set a value to a mask for easy compare */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) value = mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if ((status & mask) == value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return 0; /* already set as requested */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /* changing bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) status ^= mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) perform_write = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (perform_write) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) retries = W1_DS2438_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) while (retries--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) w1_buf[0] = W1_DS2438_WRITE_SCRATCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) w1_buf[1] = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) w1_buf[2] = status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) w1_write_block(sl->master, w1_buf, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) w1_buf[0] = W1_DS2438_COPY_SCRATCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) w1_buf[1] = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) w1_write_block(sl->master, w1_buf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static int w1_ds2438_get_voltage(struct w1_slave *sl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) int adc_input, uint16_t *voltage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) unsigned int retries = W1_DS2438_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) u8 w1_buf[DS2438_PAGE_SIZE + 1 /*for CRC*/];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) unsigned int tm = DS2438_MAX_CONVERSION_TIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) unsigned long sleep_rem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (w1_ds2438_change_config_bit(sl, DS2438_STATUS_AD, adc_input)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) goto pre_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) while (retries--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) w1_write_8(sl->master, W1_DS2438_CONVERT_VOLTAGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) sleep_rem = msleep_interruptible(tm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (sleep_rem != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) goto post_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (mutex_lock_interruptible(&sl->master->bus_mutex) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) goto post_unlock;
^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) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (w1_ds2438_get_page(sl, 0, w1_buf) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) *voltage = (((uint16_t) w1_buf[DS2438_VOLTAGE_MSB]) << 8) | ((uint16_t) w1_buf[DS2438_VOLTAGE_LSB]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) pre_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) post_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return ret;
^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) static int w1_ds2438_get_current(struct w1_slave *sl, int16_t *voltage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) u8 w1_buf[DS2438_PAGE_SIZE + 1 /*for CRC*/];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if (w1_ds2438_get_page(sl, 0, w1_buf) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* The voltage measured across current sense resistor RSENS. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) *voltage = (((int16_t) w1_buf[DS2438_CURRENT_MSB]) << 8) | ((int16_t) w1_buf[DS2438_CURRENT_LSB]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static ssize_t iad_write(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (count != 1 || off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (w1_ds2438_change_config_bit(sl, DS2438_STATUS_IAD, *buf & 0x01) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) static ssize_t iad_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) int16_t voltage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (w1_ds2438_get_current(sl, &voltage) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) ret = snprintf(buf, count, "%i\n", voltage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) static ssize_t page0_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) u8 w1_buf[DS2438_PAGE_SIZE + 1 /*for CRC*/];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /* Read no more than page0 size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (count > DS2438_PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) count = DS2438_PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) if (w1_ds2438_get_page(sl, 0, w1_buf) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) memcpy(buf, &w1_buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static ssize_t temperature_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) int16_t temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (w1_ds2438_get_temperature(sl, &temp) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) ret = snprintf(buf, count, "%i\n", temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) static ssize_t vad_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) uint16_t voltage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) if (off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if (w1_ds2438_get_voltage(sl, DS2438_ADC_INPUT_VAD, &voltage) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) ret = snprintf(buf, count, "%u\n", voltage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static ssize_t vdd_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) uint16_t voltage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (w1_ds2438_get_voltage(sl, DS2438_ADC_INPUT_VDD, &voltage) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) ret = snprintf(buf, count, "%u\n", voltage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) static BIN_ATTR(iad, S_IRUGO | S_IWUSR | S_IWGRP, iad_read, iad_write, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) static BIN_ATTR_RO(page0, DS2438_PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) static BIN_ATTR_RO(temperature, 0/* real length varies */);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) static BIN_ATTR_RO(vad, 0/* real length varies */);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) static BIN_ATTR_RO(vdd, 0/* real length varies */);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static struct bin_attribute *w1_ds2438_bin_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) &bin_attr_iad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) &bin_attr_page0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) &bin_attr_temperature,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) &bin_attr_vad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) &bin_attr_vdd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) static const struct attribute_group w1_ds2438_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) .bin_attrs = w1_ds2438_bin_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) static const struct attribute_group *w1_ds2438_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) &w1_ds2438_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) static const struct w1_family_ops w1_ds2438_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) .groups = w1_ds2438_groups,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) static struct w1_family w1_ds2438_family = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) .fid = W1_FAMILY_DS2438,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) .fops = &w1_ds2438_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) module_w1_family(w1_ds2438_family);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) MODULE_AUTHOR("Mariusz Bialonczyk <manio@skyboo.net>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) MODULE_DESCRIPTION("1-wire driver for Maxim/Dallas DS2438 Smart Battery Monitor");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2438));
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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