^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Driver for Linear Technology LTC4260 I2C Positive Voltage Hot Swap Controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2014 Guenter Roeck
^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/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/hwmon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/hwmon-sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /* chip registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define LTC4260_CONTROL 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define LTC4260_ALERT 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define LTC4260_STATUS 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define LTC4260_FAULT 0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define LTC4260_SENSE 0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define LTC4260_SOURCE 0x05
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define LTC4260_ADIN 0x06
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Fault register bits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define FAULT_OV (1 << 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define FAULT_UV (1 << 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define FAULT_OC (1 << 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define FAULT_POWER_BAD (1 << 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define FAULT_FET_SHORT (1 << 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /* Return the voltage from the given register in mV or mA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static int ltc4260_get_value(struct device *dev, u8 reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct regmap *regmap = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) unsigned int val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) ret = regmap_read(regmap, reg, &val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) switch (reg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) case LTC4260_ADIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* 10 mV resolution. Convert to mV. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) val = val * 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) case LTC4260_SOURCE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /* 400 mV resolution. Convert to mV. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) val = val * 400;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) case LTC4260_SENSE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * 300 uV resolution. Convert to current as measured with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * an 1 mOhm sense resistor, in mA. If a different sense
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * resistor is installed, calculate the actual current by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * dividing the reported current by the sense resistor value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * in mOhm.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) val = val * 300;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static ssize_t ltc4260_value_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct device_attribute *da, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) int value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) value = ltc4260_get_value(dev, attr->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (value < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return snprintf(buf, PAGE_SIZE, "%d\n", value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static ssize_t ltc4260_bool_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct device_attribute *da, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct regmap *regmap = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) unsigned int fault;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) ret = regmap_read(regmap, LTC4260_FAULT, &fault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) fault &= attr->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (fault) /* Clear reported faults in chip register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) regmap_update_bits(regmap, LTC4260_FAULT, attr->index, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return snprintf(buf, PAGE_SIZE, "%d\n", !!fault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /* Voltages */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static SENSOR_DEVICE_ATTR_RO(in1_input, ltc4260_value, LTC4260_SOURCE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static SENSOR_DEVICE_ATTR_RO(in2_input, ltc4260_value, LTC4260_ADIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * Voltage alarms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * UV/OV faults are associated with the input voltage, and the POWER BAD and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * FET SHORT faults are associated with the output voltage.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc4260_bool, FAULT_UV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc4260_bool, FAULT_OV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static SENSOR_DEVICE_ATTR_RO(in2_alarm, ltc4260_bool,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) FAULT_POWER_BAD | FAULT_FET_SHORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /* Current (via sense resistor) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc4260_value, LTC4260_SENSE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /* Overcurrent alarm */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc4260_bool, FAULT_OC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static struct attribute *ltc4260_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) &sensor_dev_attr_in1_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) &sensor_dev_attr_in1_max_alarm.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) &sensor_dev_attr_in2_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) &sensor_dev_attr_in2_alarm.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) &sensor_dev_attr_curr1_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ATTRIBUTE_GROUPS(ltc4260);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static const struct regmap_config ltc4260_regmap_config = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .reg_bits = 8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .val_bits = 8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) .max_register = LTC4260_ADIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static int ltc4260_probe(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct device *hwmon_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) regmap = devm_regmap_init_i2c(client, <c4260_regmap_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (IS_ERR(regmap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) dev_err(dev, "failed to allocate register map\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return PTR_ERR(regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) /* Clear faults */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) regmap_write(regmap, LTC4260_FAULT, 0x00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) regmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) ltc4260_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return PTR_ERR_OR_ZERO(hwmon_dev);
^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) static const struct i2c_device_id ltc4260_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {"ltc4260", 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) MODULE_DEVICE_TABLE(i2c, ltc4260_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static struct i2c_driver ltc4260_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) .name = "ltc4260",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) .probe_new = ltc4260_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) .id_table = ltc4260_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) module_i2c_driver(ltc4260_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) MODULE_DESCRIPTION("LTC4260 driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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