// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/*
* LTC2992 - Dual Wide Range Power Monitor
*
* Copyright 2020 Analog Devices Inc.
*/
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/hwmon.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regmap.h>
#define LTC2992_CTRLB 0x01
#define LTC2992_FAULT1 0x03
#define LTC2992_POWER1 0x05
#define LTC2992_POWER1_MAX 0x08
#define LTC2992_POWER1_MIN 0x0B
#define LTC2992_POWER1_MAX_THRESH 0x0E
#define LTC2992_POWER1_MIN_THRESH 0x11
#define LTC2992_DSENSE1 0x14
#define LTC2992_DSENSE1_MAX 0x16
#define LTC2992_DSENSE1_MIN 0x18
#define LTC2992_DSENSE1_MAX_THRESH 0x1A
#define LTC2992_DSENSE1_MIN_THRESH 0x1C
#define LTC2992_SENSE1 0x1E
#define LTC2992_SENSE1_MAX 0x20
#define LTC2992_SENSE1_MIN 0x22
#define LTC2992_SENSE1_MAX_THRESH 0x24
#define LTC2992_SENSE1_MIN_THRESH 0x26
#define LTC2992_G1 0x28
#define LTC2992_G1_MAX 0x2A
#define LTC2992_G1_MIN 0x2C
#define LTC2992_G1_MAX_THRESH 0x2E
#define LTC2992_G1_MIN_THRESH 0x30
#define LTC2992_FAULT2 0x35
#define LTC2992_G2 0x5A
#define LTC2992_G2_MAX 0x5C
#define LTC2992_G2_MIN 0x5E
#define LTC2992_G2_MAX_THRESH 0x60
#define LTC2992_G2_MIN_THRESH 0x62
#define LTC2992_G3 0x64
#define LTC2992_G3_MAX 0x66
#define LTC2992_G3_MIN 0x68
#define LTC2992_G3_MAX_THRESH 0x6A
#define LTC2992_G3_MIN_THRESH 0x6C
#define LTC2992_G4 0x6E
#define LTC2992_G4_MAX 0x70
#define LTC2992_G4_MIN 0x72
#define LTC2992_G4_MAX_THRESH 0x74
#define LTC2992_G4_MIN_THRESH 0x76
#define LTC2992_FAULT3 0x92
#define LTC2992_GPIO_STATUS 0x95
#define LTC2992_GPIO_IO_CTRL 0x96
#define LTC2992_GPIO_CTRL 0x97
#define LTC2992_POWER(x) (LTC2992_POWER1 + ((x) * 0x32))
#define LTC2992_POWER_MAX(x) (LTC2992_POWER1_MAX + ((x) * 0x32))
#define LTC2992_POWER_MIN(x) (LTC2992_POWER1_MIN + ((x) * 0x32))
#define LTC2992_POWER_MAX_THRESH(x) (LTC2992_POWER1_MAX_THRESH + ((x) * 0x32))
#define LTC2992_POWER_MIN_THRESH(x) (LTC2992_POWER1_MIN_THRESH + ((x) * 0x32))
#define LTC2992_DSENSE(x) (LTC2992_DSENSE1 + ((x) * 0x32))
#define LTC2992_DSENSE_MAX(x) (LTC2992_DSENSE1_MAX + ((x) * 0x32))
#define LTC2992_DSENSE_MIN(x) (LTC2992_DSENSE1_MIN + ((x) * 0x32))
#define LTC2992_DSENSE_MAX_THRESH(x) (LTC2992_DSENSE1_MAX_THRESH + ((x) * 0x32))
#define LTC2992_DSENSE_MIN_THRESH(x) (LTC2992_DSENSE1_MIN_THRESH + ((x) * 0x32))
#define LTC2992_SENSE(x) (LTC2992_SENSE1 + ((x) * 0x32))
#define LTC2992_SENSE_MAX(x) (LTC2992_SENSE1_MAX + ((x) * 0x32))
#define LTC2992_SENSE_MIN(x) (LTC2992_SENSE1_MIN + ((x) * 0x32))
#define LTC2992_SENSE_MAX_THRESH(x) (LTC2992_SENSE1_MAX_THRESH + ((x) * 0x32))
#define LTC2992_SENSE_MIN_THRESH(x) (LTC2992_SENSE1_MIN_THRESH + ((x) * 0x32))
#define LTC2992_POWER_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32))
#define LTC2992_SENSE_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32))
#define LTC2992_DSENSE_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32))
/* CTRLB register bitfields */
#define LTC2992_RESET_HISTORY BIT(3)
/* FAULT1 FAULT2 registers common bitfields */
#define LTC2992_POWER_FAULT_MSK(x) (BIT(6) << (x))
#define LTC2992_DSENSE_FAULT_MSK(x) (BIT(4) << (x))
#define LTC2992_SENSE_FAULT_MSK(x) (BIT(2) << (x))
/* FAULT1 bitfields */
#define LTC2992_GPIO1_FAULT_MSK(x) (BIT(0) << (x))
/* FAULT2 bitfields */
#define LTC2992_GPIO2_FAULT_MSK(x) (BIT(0) << (x))
/* FAULT3 bitfields */
#define LTC2992_GPIO3_FAULT_MSK(x) (BIT(6) << (x))
#define LTC2992_GPIO4_FAULT_MSK(x) (BIT(4) << (x))
#define LTC2992_IADC_NANOV_LSB 12500
#define LTC2992_VADC_UV_LSB 25000
#define LTC2992_VADC_GPIO_UV_LSB 500
#define LTC2992_GPIO_NR 4
#define LTC2992_GPIO1_BIT 7
#define LTC2992_GPIO2_BIT 6
#define LTC2992_GPIO3_BIT 0
#define LTC2992_GPIO4_BIT 6
#define LTC2992_GPIO_BIT(x) (LTC2992_GPIO_NR - (x) - 1)
struct ltc2992_state {
struct i2c_client *client;
struct gpio_chip gc;
struct mutex gpio_mutex; /* lock for gpio access */
const char *gpio_names[LTC2992_GPIO_NR];
struct regmap *regmap;
u32 r_sense_uohm[2];
};
struct ltc2992_gpio_regs {
u8 data;
u8 max;
u8 min;
u8 max_thresh;
u8 min_thresh;
u8 alarm;
u8 min_alarm_msk;
u8 max_alarm_msk;
u8 ctrl;
u8 ctrl_bit;
};
static const struct ltc2992_gpio_regs ltc2992_gpio_addr_map[] = {
{
.data = LTC2992_G1,
.max = LTC2992_G1_MAX,
.min = LTC2992_G1_MIN,
.max_thresh = LTC2992_G1_MAX_THRESH,
.min_thresh = LTC2992_G1_MIN_THRESH,
.alarm = LTC2992_FAULT1,
.min_alarm_msk = LTC2992_GPIO1_FAULT_MSK(0),
.max_alarm_msk = LTC2992_GPIO1_FAULT_MSK(1),
.ctrl = LTC2992_GPIO_IO_CTRL,
.ctrl_bit = LTC2992_GPIO1_BIT,
},
{
.data = LTC2992_G2,
.max = LTC2992_G2_MAX,
.min = LTC2992_G2_MIN,
.max_thresh = LTC2992_G2_MAX_THRESH,
.min_thresh = LTC2992_G2_MIN_THRESH,
.alarm = LTC2992_FAULT2,
.min_alarm_msk = LTC2992_GPIO2_FAULT_MSK(0),
.max_alarm_msk = LTC2992_GPIO2_FAULT_MSK(1),
.ctrl = LTC2992_GPIO_IO_CTRL,
.ctrl_bit = LTC2992_GPIO2_BIT,
},
{
.data = LTC2992_G3,
.max = LTC2992_G3_MAX,
.min = LTC2992_G3_MIN,
.max_thresh = LTC2992_G3_MAX_THRESH,
.min_thresh = LTC2992_G3_MIN_THRESH,
.alarm = LTC2992_FAULT3,
.min_alarm_msk = LTC2992_GPIO3_FAULT_MSK(0),
.max_alarm_msk = LTC2992_GPIO3_FAULT_MSK(1),
.ctrl = LTC2992_GPIO_IO_CTRL,
.ctrl_bit = LTC2992_GPIO3_BIT,
},
{
.data = LTC2992_G4,
.max = LTC2992_G4_MAX,
.min = LTC2992_G4_MIN,
.max_thresh = LTC2992_G4_MAX_THRESH,
.min_thresh = LTC2992_G4_MIN_THRESH,
.alarm = LTC2992_FAULT3,
.min_alarm_msk = LTC2992_GPIO4_FAULT_MSK(0),
.max_alarm_msk = LTC2992_GPIO4_FAULT_MSK(1),
.ctrl = LTC2992_GPIO_CTRL,
.ctrl_bit = LTC2992_GPIO4_BIT,
},
};
static const char *ltc2992_gpio_names[LTC2992_GPIO_NR] = {
"GPIO1", "GPIO2", "GPIO3", "GPIO4",
};
static int ltc2992_read_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len)
{
u8 regvals[4];
int val;
int ret;
int i;
ret = regmap_bulk_read(st->regmap, addr, regvals, reg_len);
if (ret < 0)
return ret;
val = 0;
for (i = 0; i < reg_len; i++)
val |= regvals[reg_len - i - 1] << (i * 8);
return val;
}
static int ltc2992_write_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len, u32 val)
{
u8 regvals[4];
int i;
for (i = 0; i < reg_len; i++)
regvals[reg_len - i - 1] = (val >> (i * 8)) & 0xFF;
return regmap_bulk_write(st->regmap, addr, regvals, reg_len);
}
static int ltc2992_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct ltc2992_state *st = gpiochip_get_data(chip);
unsigned long gpio_status;
int reg;
mutex_lock(&st->gpio_mutex);
reg = ltc2992_read_reg(st, LTC2992_GPIO_STATUS, 1);
mutex_unlock(&st->gpio_mutex);
if (reg < 0)
return reg;
gpio_status = reg;
return !test_bit(LTC2992_GPIO_BIT(offset), &gpio_status);
}
static int ltc2992_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
unsigned long *bits)
{
struct ltc2992_state *st = gpiochip_get_data(chip);
unsigned long gpio_status;
unsigned int gpio_nr;
int reg;
mutex_lock(&st->gpio_mutex);
reg = ltc2992_read_reg(st, LTC2992_GPIO_STATUS, 1);
mutex_unlock(&st->gpio_mutex);
if (reg < 0)
return reg;
gpio_status = reg;
for_each_set_bit(gpio_nr, mask, LTC2992_GPIO_NR) {
if (test_bit(LTC2992_GPIO_BIT(gpio_nr), &gpio_status))
set_bit(gpio_nr, bits);
}
return 0;
}
static void ltc2992_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
{
struct ltc2992_state *st = gpiochip_get_data(chip);
unsigned long gpio_ctrl;
int reg;
mutex_lock(&st->gpio_mutex);
reg = ltc2992_read_reg(st, ltc2992_gpio_addr_map[offset].ctrl, 1);
if (reg < 0) {
mutex_unlock(&st->gpio_mutex);
return;
}
gpio_ctrl = reg;
assign_bit(ltc2992_gpio_addr_map[offset].ctrl_bit, &gpio_ctrl, value);
ltc2992_write_reg(st, ltc2992_gpio_addr_map[offset].ctrl, 1, gpio_ctrl);
mutex_unlock(&st->gpio_mutex);
}
static void ltc2992_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
unsigned long *bits)
{
struct ltc2992_state *st = gpiochip_get_data(chip);
unsigned long gpio_ctrl_io = 0;
unsigned long gpio_ctrl = 0;
unsigned int gpio_nr;
for_each_set_bit(gpio_nr, mask, LTC2992_GPIO_NR) {
if (gpio_nr < 3)
assign_bit(ltc2992_gpio_addr_map[gpio_nr].ctrl_bit, &gpio_ctrl_io, true);
if (gpio_nr == 3)
assign_bit(ltc2992_gpio_addr_map[gpio_nr].ctrl_bit, &gpio_ctrl, true);
}
mutex_lock(&st->gpio_mutex);
ltc2992_write_reg(st, LTC2992_GPIO_IO_CTRL, 1, gpio_ctrl_io);
ltc2992_write_reg(st, LTC2992_GPIO_CTRL, 1, gpio_ctrl);
mutex_unlock(&st->gpio_mutex);
}
static int ltc2992_config_gpio(struct ltc2992_state *st)
{
const char *name = dev_name(&st->client->dev);
char *gpio_name;
int ret;
int i;
ret = ltc2992_write_reg(st, LTC2992_GPIO_IO_CTRL, 1, 0);
if (ret < 0)
return ret;
mutex_init(&st->gpio_mutex);
for (i = 0; i < ARRAY_SIZE(st->gpio_names); i++) {
gpio_name = devm_kasprintf(&st->client->dev, GFP_KERNEL, "ltc2992-%x-%s",
st->client->addr, ltc2992_gpio_names[i]);
if (!gpio_name)
return -ENOMEM;
st->gpio_names[i] = gpio_name;
}
st->gc.label = name;
st->gc.parent = &st->client->dev;
st->gc.owner = THIS_MODULE;
st->gc.base = -1;
st->gc.names = st->gpio_names;
st->gc.ngpio = ARRAY_SIZE(st->gpio_names);
st->gc.get = ltc2992_gpio_get;
st->gc.get_multiple = ltc2992_gpio_get_multiple;
st->gc.set = ltc2992_gpio_set;
st->gc.set_multiple = ltc2992_gpio_set_multiple;
ret = devm_gpiochip_add_data(&st->client->dev, &st->gc, st);
if (ret)
dev_err(&st->client->dev, "GPIO registering failed (%d)\n", ret);
return ret;
}
static umode_t ltc2992_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
int channel)
{
const struct ltc2992_state *st = data;
switch (type) {
case hwmon_chip:
switch (attr) {
case hwmon_chip_in_reset_history:
return 0200;
}
break;
case hwmon_in:
switch (attr) {
case hwmon_in_input:
case hwmon_in_lowest:
case hwmon_in_highest:
case hwmon_in_min_alarm:
case hwmon_in_max_alarm:
return 0444;
case hwmon_in_min:
case hwmon_in_max:
return 0644;
}
break;
case hwmon_curr:
switch (attr) {
case hwmon_curr_input:
case hwmon_curr_lowest:
case hwmon_curr_highest:
case hwmon_curr_min_alarm:
case hwmon_curr_max_alarm:
if (st->r_sense_uohm[channel])
return 0444;
break;
case hwmon_curr_min:
case hwmon_curr_max:
if (st->r_sense_uohm[channel])
return 0644;
break;
}
break;
case hwmon_power:
switch (attr) {
case hwmon_power_input:
case hwmon_power_input_lowest:
case hwmon_power_input_highest:
case hwmon_power_min_alarm:
case hwmon_power_max_alarm:
if (st->r_sense_uohm[channel])
return 0444;
break;
case hwmon_power_min:
case hwmon_power_max:
if (st->r_sense_uohm[channel])
return 0644;
break;
}
break;
default:
break;
}
return 0;
}
static int ltc2992_get_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long *val)
{
int reg_val;
reg_val = ltc2992_read_reg(st, reg, 2);
if (reg_val < 0)
return reg_val;
reg_val = reg_val >> 4;
*val = DIV_ROUND_CLOSEST(reg_val * scale, 1000);
return 0;
}
static int ltc2992_set_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long val)
{
val = DIV_ROUND_CLOSEST(val * 1000, scale);
val = val << 4;
return ltc2992_write_reg(st, reg, 2, val);
}
static int ltc2992_read_gpio_alarm(struct ltc2992_state *st, int nr_gpio, u32 attr, long *val)
{
int reg_val;
u32 mask;
if (attr == hwmon_in_max_alarm)
mask = ltc2992_gpio_addr_map[nr_gpio].max_alarm_msk;
else
mask = ltc2992_gpio_addr_map[nr_gpio].min_alarm_msk;
reg_val = ltc2992_read_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1);
if (reg_val < 0)
return reg_val;
*val = !!(reg_val & mask);
reg_val &= ~mask;
return ltc2992_write_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1, reg_val);
}
static int ltc2992_read_gpios_in(struct device *dev, u32 attr, int nr_gpio, long *val)
{
struct ltc2992_state *st = dev_get_drvdata(dev);
u32 reg;
switch (attr) {
case hwmon_in_input:
reg = ltc2992_gpio_addr_map[nr_gpio].data;
break;
case hwmon_in_lowest:
reg = ltc2992_gpio_addr_map[nr_gpio].min;
break;
case hwmon_in_highest:
reg = ltc2992_gpio_addr_map[nr_gpio].max;
break;
case hwmon_in_min:
reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh;
break;
case hwmon_in_max:
reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh;
break;
case hwmon_in_min_alarm:
case hwmon_in_max_alarm:
return ltc2992_read_gpio_alarm(st, nr_gpio, attr, val);
default:
return -EOPNOTSUPP;
}
return ltc2992_get_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val);
}
static int ltc2992_read_in_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr)
{
int reg_val;
u32 mask;
if (attr == hwmon_in_max_alarm)
mask = LTC2992_SENSE_FAULT_MSK(1);
else
mask = LTC2992_SENSE_FAULT_MSK(0);
reg_val = ltc2992_read_reg(st, LTC2992_SENSE_FAULT(channel), 1);
if (reg_val < 0)
return reg_val;
*val = !!(reg_val & mask);
reg_val &= ~mask;
return ltc2992_write_reg(st, LTC2992_SENSE_FAULT(channel), 1, reg_val);
}
static int ltc2992_read_in(struct device *dev, u32 attr, int channel, long *val)
{
struct ltc2992_state *st = dev_get_drvdata(dev);
u32 reg;
if (channel > 1)
return ltc2992_read_gpios_in(dev, attr, channel - 2, val);
switch (attr) {
case hwmon_in_input:
reg = LTC2992_SENSE(channel);
break;
case hwmon_in_lowest:
reg = LTC2992_SENSE_MIN(channel);
break;
case hwmon_in_highest:
reg = LTC2992_SENSE_MAX(channel);
break;
case hwmon_in_min:
reg = LTC2992_SENSE_MIN_THRESH(channel);
break;
case hwmon_in_max:
reg = LTC2992_SENSE_MAX_THRESH(channel);
break;
case hwmon_in_min_alarm:
case hwmon_in_max_alarm:
return ltc2992_read_in_alarm(st, channel, val, attr);
default:
return -EOPNOTSUPP;
}
return ltc2992_get_voltage(st, reg, LTC2992_VADC_UV_LSB, val);
}
static int ltc2992_get_current(struct ltc2992_state *st, u32 reg, u32 channel, long *val)
{
int reg_val;
reg_val = ltc2992_read_reg(st, reg, 2);
if (reg_val < 0)
return reg_val;
reg_val = reg_val >> 4;
*val = DIV_ROUND_CLOSEST(reg_val * LTC2992_IADC_NANOV_LSB, st->r_sense_uohm[channel]);
return 0;
}
static int ltc2992_set_current(struct ltc2992_state *st, u32 reg, u32 channel, long val)
{
u32 reg_val;
reg_val = DIV_ROUND_CLOSEST(val * st->r_sense_uohm[channel], LTC2992_IADC_NANOV_LSB);
reg_val = reg_val << 4;
return ltc2992_write_reg(st, reg, 2, reg_val);
}
static int ltc2992_read_curr_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr)
{
int reg_val;
u32 mask;
if (attr == hwmon_curr_max_alarm)
mask = LTC2992_DSENSE_FAULT_MSK(1);
else
mask = LTC2992_DSENSE_FAULT_MSK(0);
reg_val = ltc2992_read_reg(st, LTC2992_DSENSE_FAULT(channel), 1);
if (reg_val < 0)
return reg_val;
*val = !!(reg_val & mask);
reg_val &= ~mask;
return ltc2992_write_reg(st, LTC2992_DSENSE_FAULT(channel), 1, reg_val);
}
static int ltc2992_read_curr(struct device *dev, u32 attr, int channel, long *val)
{
struct ltc2992_state *st = dev_get_drvdata(dev);
u32 reg;
switch (attr) {
case hwmon_curr_input:
reg = LTC2992_DSENSE(channel);
break;
case hwmon_curr_lowest:
reg = LTC2992_DSENSE_MIN(channel);
break;
case hwmon_curr_highest:
reg = LTC2992_DSENSE_MAX(channel);
break;
case hwmon_curr_min:
reg = LTC2992_DSENSE_MIN_THRESH(channel);
break;
case hwmon_curr_max:
reg = LTC2992_DSENSE_MAX_THRESH(channel);
break;
case hwmon_curr_min_alarm:
case hwmon_curr_max_alarm:
return ltc2992_read_curr_alarm(st, channel, val, attr);
default:
return -EOPNOTSUPP;
}
return ltc2992_get_current(st, reg, channel, val);
}
static int ltc2992_get_power(struct ltc2992_state *st, u32 reg, u32 channel, long *val)
{
int reg_val;
reg_val = ltc2992_read_reg(st, reg, 3);
if (reg_val < 0)
return reg_val;
*val = mul_u64_u32_div(reg_val, LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB,
st->r_sense_uohm[channel] * 1000);
return 0;
}
static int ltc2992_set_power(struct ltc2992_state *st, u32 reg, u32 channel, long val)
{
u32 reg_val;
reg_val = mul_u64_u32_div(val, st->r_sense_uohm[channel] * 1000,
LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB);
return ltc2992_write_reg(st, reg, 3, reg_val);
}
static int ltc2992_read_power_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr)
{
int reg_val;
u32 mask;
if (attr == hwmon_power_max_alarm)
mask = LTC2992_POWER_FAULT_MSK(1);
else
mask = LTC2992_POWER_FAULT_MSK(0);
reg_val = ltc2992_read_reg(st, LTC2992_POWER_FAULT(channel), 1);
if (reg_val < 0)
return reg_val;
*val = !!(reg_val & mask);
reg_val &= ~mask;
return ltc2992_write_reg(st, LTC2992_POWER_FAULT(channel), 1, reg_val);
}
static int ltc2992_read_power(struct device *dev, u32 attr, int channel, long *val)
{
struct ltc2992_state *st = dev_get_drvdata(dev);
u32 reg;
switch (attr) {
case hwmon_power_input:
reg = LTC2992_POWER(channel);
break;
case hwmon_power_input_lowest:
reg = LTC2992_POWER_MIN(channel);
break;
case hwmon_power_input_highest:
reg = LTC2992_POWER_MAX(channel);
break;
case hwmon_power_min:
reg = LTC2992_POWER_MIN_THRESH(channel);
break;
case hwmon_power_max:
reg = LTC2992_POWER_MAX_THRESH(channel);
break;
case hwmon_power_min_alarm:
case hwmon_power_max_alarm:
return ltc2992_read_power_alarm(st, channel, val, attr);
default:
return -EOPNOTSUPP;
}
return ltc2992_get_power(st, reg, channel, val);
}
static int ltc2992_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
long *val)
{
switch (type) {
case hwmon_in:
return ltc2992_read_in(dev, attr, channel, val);
case hwmon_curr:
return ltc2992_read_curr(dev, attr, channel, val);
case hwmon_power:
return ltc2992_read_power(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static int ltc2992_write_curr(struct device *dev, u32 attr, int channel, long val)
{
struct ltc2992_state *st = dev_get_drvdata(dev);
u32 reg;
switch (attr) {
case hwmon_curr_min:
reg = LTC2992_DSENSE_MIN_THRESH(channel);
break;
case hwmon_curr_max:
reg = LTC2992_DSENSE_MAX_THRESH(channel);
break;
default:
return -EOPNOTSUPP;
}
return ltc2992_set_current(st, reg, channel, val);
}
static int ltc2992_write_gpios_in(struct device *dev, u32 attr, int nr_gpio, long val)
{
struct ltc2992_state *st = dev_get_drvdata(dev);
u32 reg;
switch (attr) {
case hwmon_in_min:
reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh;
break;
case hwmon_in_max:
reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh;
break;
default:
return -EOPNOTSUPP;
}
return ltc2992_set_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val);
}
static int ltc2992_write_in(struct device *dev, u32 attr, int channel, long val)
{
struct ltc2992_state *st = dev_get_drvdata(dev);
u32 reg;
if (channel > 1)
return ltc2992_write_gpios_in(dev, attr, channel - 2, val);
switch (attr) {
case hwmon_in_min:
reg = LTC2992_SENSE_MIN_THRESH(channel);
break;
case hwmon_in_max:
reg = LTC2992_SENSE_MAX_THRESH(channel);
break;
default:
return -EOPNOTSUPP;
}
return ltc2992_set_voltage(st, reg, LTC2992_VADC_UV_LSB, val);
}
static int ltc2992_write_power(struct device *dev, u32 attr, int channel, long val)
{
struct ltc2992_state *st = dev_get_drvdata(dev);
u32 reg;
switch (attr) {
case hwmon_power_min:
reg = LTC2992_POWER_MIN_THRESH(channel);
break;
case hwmon_power_max:
reg = LTC2992_POWER_MAX_THRESH(channel);
break;
default:
return -EOPNOTSUPP;
}
return ltc2992_set_power(st, reg, channel, val);
}
static int ltc2992_write_chip(struct device *dev, u32 attr, int channel, long val)
{
struct ltc2992_state *st = dev_get_drvdata(dev);
switch (attr) {
case hwmon_chip_in_reset_history:
return regmap_update_bits(st->regmap, LTC2992_CTRLB, LTC2992_RESET_HISTORY,
LTC2992_RESET_HISTORY);
default:
return -EOPNOTSUPP;
}
}
static int ltc2992_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
long val)
{
switch (type) {
case hwmon_chip:
return ltc2992_write_chip(dev, attr, channel, val);
case hwmon_in:
return ltc2992_write_in(dev, attr, channel, val);
case hwmon_curr:
return ltc2992_write_curr(dev, attr, channel, val);
case hwmon_power:
return ltc2992_write_power(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static const struct hwmon_ops ltc2992_hwmon_ops = {
.is_visible = ltc2992_is_visible,
.read = ltc2992_read,
.write = ltc2992_write,
};
static const struct hwmon_channel_info *ltc2992_info[] = {
HWMON_CHANNEL_INFO(chip,
HWMON_C_IN_RESET_HISTORY),
HWMON_CHANNEL_INFO(in,
HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM),
HWMON_CHANNEL_INFO(curr,
HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN |
HWMON_C_MAX | HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM,
HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN |
HWMON_C_MAX | HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM),
HWMON_CHANNEL_INFO(power,
HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST |
HWMON_P_MIN | HWMON_P_MAX | HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM,
HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST |
HWMON_P_MIN | HWMON_P_MAX | HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM),
NULL
};
static const struct hwmon_chip_info ltc2992_chip_info = {
.ops = <c2992_hwmon_ops,
.info = ltc2992_info,
};
static const struct regmap_config ltc2992_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0xE8,
};
static int ltc2992_parse_dt(struct ltc2992_state *st)
{
struct fwnode_handle *fwnode;
struct fwnode_handle *child;
u32 addr;
u32 val;
int ret;
fwnode = dev_fwnode(&st->client->dev);
fwnode_for_each_available_child_node(fwnode, child) {
ret = fwnode_property_read_u32(child, "reg", &addr);
if (ret < 0) {
fwnode_handle_put(child);
return ret;
}
if (addr > 1) {
fwnode_handle_put(child);
return -EINVAL;
}
ret = fwnode_property_read_u32(child, "shunt-resistor-micro-ohms", &val);
if (!ret)
st->r_sense_uohm[addr] = val;
}
return 0;
}
static int ltc2992_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct device *hwmon_dev;
struct ltc2992_state *st;
int ret;
st = devm_kzalloc(&client->dev, sizeof(*st), GFP_KERNEL);
if (!st)
return -ENOMEM;
st->client = client;
st->regmap = devm_regmap_init_i2c(client, <c2992_regmap_config);
if (IS_ERR(st->regmap))
return PTR_ERR(st->regmap);
ret = ltc2992_parse_dt(st);
if (ret < 0)
return ret;
ret = ltc2992_config_gpio(st);
if (ret < 0)
return ret;
hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, client->name, st,
<c2992_chip_info, NULL);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct of_device_id ltc2992_of_match[] = {
{ .compatible = "adi,ltc2992" },
{ }
};
MODULE_DEVICE_TABLE(of, ltc2992_of_match);
static const struct i2c_device_id ltc2992_i2c_id[] = {
{"ltc2992", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, ltc2992_i2c_id);
static struct i2c_driver ltc2992_i2c_driver = {
.driver = {
.name = "ltc2992",
.of_match_table = ltc2992_of_match,
},
.probe = ltc2992_i2c_probe,
.id_table = ltc2992_i2c_id,
};
module_i2c_driver(ltc2992_i2c_driver);
MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@analog.com>");
MODULE_DESCRIPTION("Hwmon driver for Linear Technology 2992");
MODULE_LICENSE("Dual BSD/GPL");