^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) * Driver for Linear Technology LTC4215 I2C 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) 2009 Ira W. Snyder <iws@ovro.caltech.edu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Datasheet:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1006,C1163,P17572,D12697
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^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/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/hwmon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/hwmon-sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /* Here are names of the chip's registers (a.k.a. commands) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) enum ltc4215_cmd {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) LTC4215_CONTROL = 0x00, /* rw */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) LTC4215_ALERT = 0x01, /* rw */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) LTC4215_STATUS = 0x02, /* ro */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) LTC4215_FAULT = 0x03, /* rw */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) LTC4215_SENSE = 0x04, /* rw */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) LTC4215_SOURCE = 0x05, /* rw */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) LTC4215_ADIN = 0x06, /* rw */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct ltc4215_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct mutex update_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) bool valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) unsigned long last_updated; /* in jiffies */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /* Registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) u8 regs[7];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static struct ltc4215_data *ltc4215_update_device(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct ltc4215_data *data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct i2c_client *client = data->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) s32 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) mutex_lock(&data->update_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /* The chip's A/D updates 10 times per second */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (time_after(jiffies, data->last_updated + HZ / 10) || !data->valid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) dev_dbg(&client->dev, "Starting ltc4215 update\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /* Read all registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) for (i = 0; i < ARRAY_SIZE(data->regs); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) val = i2c_smbus_read_byte_data(client, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (unlikely(val < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) data->regs[i] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) data->regs[i] = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) data->last_updated = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) data->valid = 1;
^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) mutex_unlock(&data->update_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /* Return the voltage from the given register in millivolts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static int ltc4215_get_voltage(struct device *dev, u8 reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct ltc4215_data *data = ltc4215_update_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) const u8 regval = data->regs[reg];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) u32 voltage = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) switch (reg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) case LTC4215_SENSE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /* 151 uV per increment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) voltage = regval * 151 / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) case LTC4215_SOURCE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) /* 60.5 mV per increment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) voltage = regval * 605 / 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) case LTC4215_ADIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * The ADIN input is divided by 12.5, and has 4.82 mV
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * per increment, so we have the additional multiply
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) voltage = regval * 482 * 125 / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* If we get here, the developer messed up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) WARN_ON_ONCE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) break;
^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) return voltage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* Return the current from the sense resistor in mA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static unsigned int ltc4215_get_current(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct ltc4215_data *data = ltc4215_update_device(dev);
^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) * The strange looking conversions that follow are fixed-point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * math, since we cannot do floating point in the kernel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * Step 1: convert sense register to microVolts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * Step 2: convert voltage to milliAmperes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * If you play around with the V=IR equation, you come up with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * the following: X uV / Y mOhm == Z mA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * With the resistors that are fractions of a milliOhm, we multiply
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * the voltage and resistance by 10, to shift the decimal point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * Now we can use the normal division operator again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /* Calculate voltage in microVolts (151 uV per increment) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) const unsigned int voltage = data->regs[LTC4215_SENSE] * 151;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /* Calculate current in milliAmperes (4 milliOhm sense resistor) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) const unsigned int curr = voltage / 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return curr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static ssize_t ltc4215_voltage_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) struct device_attribute *da, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) const int voltage = ltc4215_get_voltage(dev, attr->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return snprintf(buf, PAGE_SIZE, "%d\n", voltage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static ssize_t ltc4215_current_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct device_attribute *da, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) const unsigned int curr = ltc4215_get_current(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return snprintf(buf, PAGE_SIZE, "%u\n", curr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static ssize_t ltc4215_power_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct device_attribute *da, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) const unsigned int curr = ltc4215_get_current(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) const int output_voltage = ltc4215_get_voltage(dev, LTC4215_ADIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* current in mA * voltage in mV == power in uW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) const unsigned int power = abs(output_voltage * curr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return snprintf(buf, PAGE_SIZE, "%u\n", power);
^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 ssize_t ltc4215_alarm_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct device_attribute *da, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct ltc4215_data *data = ltc4215_update_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) const u8 reg = data->regs[LTC4215_STATUS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) const u32 mask = attr->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return snprintf(buf, PAGE_SIZE, "%u\n", !!(reg & mask));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * These macros are used below in constructing device attribute objects
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * for use with sysfs_create_group() to make a sysfs device file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * for each register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /* Construct a sensor_device_attribute structure for each register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) /* Current */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc4215_current, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc4215_alarm, 1 << 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /* Power (virtual) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) static SENSOR_DEVICE_ATTR_RO(power1_input, ltc4215_power, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) /* Input Voltage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static SENSOR_DEVICE_ATTR_RO(in1_input, ltc4215_voltage, LTC4215_ADIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc4215_alarm, 1 << 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc4215_alarm, 1 << 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) /* Output Voltage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static SENSOR_DEVICE_ATTR_RO(in2_input, ltc4215_voltage, LTC4215_SOURCE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static SENSOR_DEVICE_ATTR_RO(in2_min_alarm, ltc4215_alarm, 1 << 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * Finally, construct an array of pointers to members of the above objects,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * as required for sysfs_create_group()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static struct attribute *ltc4215_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) &sensor_dev_attr_curr1_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) &sensor_dev_attr_power1_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) &sensor_dev_attr_in1_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) &sensor_dev_attr_in1_max_alarm.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) &sensor_dev_attr_in2_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) &sensor_dev_attr_in2_min_alarm.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) ATTRIBUTE_GROUPS(ltc4215);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static int ltc4215_probe(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct i2c_adapter *adapter = client->adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct ltc4215_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) struct device *hwmon_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) data->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) mutex_init(&data->update_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) /* Initialize the LTC4215 chip */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) i2c_smbus_write_byte_data(client, LTC4215_FAULT, 0x00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) ltc4215_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) return PTR_ERR_OR_ZERO(hwmon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) static const struct i2c_device_id ltc4215_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) { "ltc4215", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) MODULE_DEVICE_TABLE(i2c, ltc4215_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) /* This is the driver that will be inserted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static struct i2c_driver ltc4215_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) .name = "ltc4215",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) .probe_new = ltc4215_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) .id_table = ltc4215_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) module_i2c_driver(ltc4215_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) MODULE_DESCRIPTION("LTC4215 driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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