https://github.com/torvalds/linux
Tip revision: 6ba59ff4227927d3a8530fc2973b80e94b54d58f authored by Linus Torvalds on 16 June 2024, 20:40:16 UTC
Linux 6.10-rc4
Linux 6.10-rc4
Tip revision: 6ba59ff
emc1403.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* emc1403.c - SMSC Thermal Driver
*
* Copyright (C) 2008 Intel Corp
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/sysfs.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/util_macros.h>
#define THERMAL_PID_REG 0xfd
#define THERMAL_SMSC_ID_REG 0xfe
#define THERMAL_REVISION_REG 0xff
enum emc1403_chip { emc1402, emc1403, emc1404, emc1428 };
struct thermal_data {
enum emc1403_chip chip;
struct regmap *regmap;
struct mutex mutex;
};
static ssize_t power_state_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_data *data = dev_get_drvdata(dev);
unsigned int val;
int retval;
retval = regmap_read(data->regmap, 0x03, &val);
if (retval < 0)
return retval;
return sprintf(buf, "%d\n", !!(val & BIT(6)));
}
static ssize_t power_state_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct thermal_data *data = dev_get_drvdata(dev);
unsigned long val;
int retval;
if (kstrtoul(buf, 10, &val))
return -EINVAL;
retval = regmap_update_bits(data->regmap, 0x03, BIT(6),
val ? BIT(6) : 0);
if (retval < 0)
return retval;
return count;
}
static DEVICE_ATTR_RW(power_state);
static struct attribute *emc1403_attrs[] = {
&dev_attr_power_state.attr,
NULL
};
ATTRIBUTE_GROUPS(emc1403);
static int emc1403_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
int id;
/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
if (id != 0x5d)
return -ENODEV;
id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
switch (id) {
case 0x20:
strscpy(info->type, "emc1402", I2C_NAME_SIZE);
break;
case 0x21:
strscpy(info->type, "emc1403", I2C_NAME_SIZE);
break;
case 0x22:
strscpy(info->type, "emc1422", I2C_NAME_SIZE);
break;
case 0x23:
strscpy(info->type, "emc1423", I2C_NAME_SIZE);
break;
case 0x25:
strscpy(info->type, "emc1404", I2C_NAME_SIZE);
break;
case 0x27:
strscpy(info->type, "emc1424", I2C_NAME_SIZE);
break;
case 0x29:
strscpy(info->type, "emc1428", I2C_NAME_SIZE);
break;
case 0x59:
strscpy(info->type, "emc1438", I2C_NAME_SIZE);
break;
case 0x60:
strscpy(info->type, "emc1442", I2C_NAME_SIZE);
break;
default:
return -ENODEV;
}
id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
if (id < 0x01 || id > 0x04)
return -ENODEV;
return 0;
}
static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
{
switch (reg) {
case 0x00: /* internal diode high byte */
case 0x01: /* external diode 1 high byte */
case 0x02: /* status */
case 0x10: /* external diode 1 low byte */
case 0x1b: /* external diode fault */
case 0x23: /* external diode 2 high byte */
case 0x24: /* external diode 2 low byte */
case 0x29: /* internal diode low byte */
case 0x2a: /* externl diode 3 high byte */
case 0x2b: /* external diode 3 low byte */
case 0x35: /* high limit status */
case 0x36: /* low limit status */
case 0x37: /* therm limit status */
case 0x41: /* external diode 4 high byte */
case 0x42: /* external diode 4 low byte */
case 0x43: /* external diode 5 high byte */
case 0x44: /* external diode 5 low byte */
case 0x45: /* external diode 6 high byte */
case 0x46: /* external diode 6 low byte */
case 0x47: /* external diode 7 high byte */
case 0x48: /* external diode 7 low byte */
return true;
default:
return false;
}
}
static const struct regmap_config emc1403_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.cache_type = REGCACHE_MAPLE,
.volatile_reg = emc1403_regmap_is_volatile,
};
enum emc1403_reg_map {temp_min, temp_max, temp_crit, temp_input};
static u8 ema1403_temp_map[] = {
[hwmon_temp_min] = temp_min,
[hwmon_temp_max] = temp_max,
[hwmon_temp_crit] = temp_crit,
[hwmon_temp_input] = temp_input,
};
static u8 emc1403_temp_regs[][4] = {
[0] = {
[temp_min] = 0x06,
[temp_max] = 0x05,
[temp_crit] = 0x20,
[temp_input] = 0x00,
},
[1] = {
[temp_min] = 0x08,
[temp_max] = 0x07,
[temp_crit] = 0x19,
[temp_input] = 0x01,
},
[2] = {
[temp_min] = 0x16,
[temp_max] = 0x15,
[temp_crit] = 0x1a,
[temp_input] = 0x23,
},
[3] = {
[temp_min] = 0x2d,
[temp_max] = 0x2c,
[temp_crit] = 0x30,
[temp_input] = 0x2a,
},
[4] = {
[temp_min] = 0x51,
[temp_max] = 0x50,
[temp_crit] = 0x64,
[temp_input] = 0x41,
},
[5] = {
[temp_min] = 0x55,
[temp_max] = 0x54,
[temp_crit] = 0x65,
[temp_input] = 0x43
},
[6] = {
[temp_min] = 0x59,
[temp_max] = 0x58,
[temp_crit] = 0x66,
[temp_input] = 0x45,
},
[7] = {
[temp_min] = 0x5d,
[temp_max] = 0x5c,
[temp_crit] = 0x67,
[temp_input] = 0x47,
},
};
static s8 emc1403_temp_regs_low[][4] = {
[0] = {
[temp_min] = -1,
[temp_max] = -1,
[temp_crit] = -1,
[temp_input] = 0x29,
},
[1] = {
[temp_min] = 0x14,
[temp_max] = 0x13,
[temp_crit] = -1,
[temp_input] = 0x10,
},
[2] = {
[temp_min] = 0x18,
[temp_max] = 0x17,
[temp_crit] = -1,
[temp_input] = 0x24,
},
[3] = {
[temp_min] = 0x2f,
[temp_max] = 0x2e,
[temp_crit] = -1,
[temp_input] = 0x2b,
},
[4] = {
[temp_min] = 0x53,
[temp_max] = 0x52,
[temp_crit] = -1,
[temp_input] = 0x42,
},
[5] = {
[temp_min] = 0x57,
[temp_max] = 0x56,
[temp_crit] = -1,
[temp_input] = 0x44,
},
[6] = {
[temp_min] = 0x5b,
[temp_max] = 0x5a,
[temp_crit] = -1,
[temp_input] = 0x46,
},
[7] = {
[temp_min] = 0x5f,
[temp_max] = 0x5e,
[temp_crit] = -1,
[temp_input] = 0x48,
},
};
static int __emc1403_get_temp(struct thermal_data *data, int channel,
enum emc1403_reg_map map, long *val)
{
unsigned int regvalh;
unsigned int regvall = 0;
int ret;
s8 reg;
ret = regmap_read(data->regmap, emc1403_temp_regs[channel][map], ®valh);
if (ret < 0)
return ret;
reg = emc1403_temp_regs_low[channel][map];
if (reg >= 0) {
ret = regmap_read(data->regmap, reg, ®vall);
if (ret < 0)
return ret;
}
if (data->chip == emc1428)
*val = sign_extend32((regvalh << 3) | (regvall >> 5), 10) * 125;
else
*val = ((regvalh << 3) | (regvall >> 5)) * 125;
return 0;
}
static int emc1403_get_temp(struct thermal_data *data, int channel,
enum emc1403_reg_map map, long *val)
{
int ret;
mutex_lock(&data->mutex);
ret = __emc1403_get_temp(data, channel, map, val);
mutex_unlock(&data->mutex);
return ret;
}
static int emc1403_get_hyst(struct thermal_data *data, int channel,
enum emc1403_reg_map map, long *val)
{
int hyst, ret;
long limit;
mutex_lock(&data->mutex);
ret = __emc1403_get_temp(data, channel, map, &limit);
if (ret < 0)
goto unlock;
ret = regmap_read(data->regmap, 0x21, &hyst);
if (ret < 0)
goto unlock;
if (map == temp_min)
*val = limit + hyst * 1000;
else
*val = limit - hyst * 1000;
unlock:
mutex_unlock(&data->mutex);
return ret;
}
static int emc1403_temp_read(struct thermal_data *data, u32 attr, int channel, long *val)
{
unsigned int regval;
int ret;
switch (attr) {
case hwmon_temp_min:
case hwmon_temp_max:
case hwmon_temp_crit:
case hwmon_temp_input:
ret = emc1403_get_temp(data, channel, ema1403_temp_map[attr], val);
break;
case hwmon_temp_min_hyst:
ret = emc1403_get_hyst(data, channel, temp_min, val);
break;
case hwmon_temp_max_hyst:
ret = emc1403_get_hyst(data, channel, temp_max, val);
break;
case hwmon_temp_crit_hyst:
ret = emc1403_get_hyst(data, channel, temp_crit, val);
break;
case hwmon_temp_min_alarm:
if (data->chip == emc1402) {
ret = regmap_read(data->regmap, 0x02, ®val);
if (ret < 0)
break;
*val = !!(regval & BIT(5 - 2 * channel));
} else {
ret = regmap_read(data->regmap, 0x36, ®val);
if (ret < 0)
break;
*val = !!(regval & BIT(channel));
}
break;
case hwmon_temp_max_alarm:
if (data->chip == emc1402) {
ret = regmap_read(data->regmap, 0x02, ®val);
if (ret < 0)
break;
*val = !!(regval & BIT(6 - 2 * channel));
} else {
ret = regmap_read(data->regmap, 0x35, ®val);
if (ret < 0)
break;
*val = !!(regval & BIT(channel));
}
break;
case hwmon_temp_crit_alarm:
if (data->chip == emc1402) {
ret = regmap_read(data->regmap, 0x02, ®val);
if (ret < 0)
break;
*val = !!(regval & BIT(channel));
} else {
ret = regmap_read(data->regmap, 0x37, ®val);
if (ret < 0)
break;
*val = !!(regval & BIT(channel));
}
break;
case hwmon_temp_fault:
ret = regmap_read(data->regmap, 0x1b, ®val);
if (ret < 0)
break;
*val = !!(regval & BIT(channel));
break;
default:
return -EOPNOTSUPP;
}
return ret;
}
static int emc1403_get_convrate(struct thermal_data *data, long *val)
{
unsigned int convrate;
int ret;
ret = regmap_read(data->regmap, 0x04, &convrate);
if (ret < 0)
return ret;
if (convrate > 10)
convrate = 4;
*val = 16000 >> convrate;
return 0;
}
static int emc1403_chip_read(struct thermal_data *data, u32 attr, long *val)
{
switch (attr) {
case hwmon_chip_update_interval:
return emc1403_get_convrate(data, val);
default:
return -EOPNOTSUPP;
}
}
static int emc1403_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct thermal_data *data = dev_get_drvdata(dev);
switch (type) {
case hwmon_temp:
return emc1403_temp_read(data, attr, channel, val);
case hwmon_chip:
return emc1403_chip_read(data, attr, val);
default:
return -EOPNOTSUPP;
}
}
static int emc1403_set_hyst(struct thermal_data *data, long val)
{
int hyst, ret;
long limit;
if (data->chip == emc1428)
val = clamp_val(val, -128000, 127000);
else
val = clamp_val(val, 0, 255000);
mutex_lock(&data->mutex);
ret = __emc1403_get_temp(data, 0, temp_crit, &limit);
if (ret < 0)
goto unlock;
hyst = limit - val;
if (data->chip == emc1428)
hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 127);
else
hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);
ret = regmap_write(data->regmap, 0x21, hyst);
unlock:
mutex_unlock(&data->mutex);
return ret;
}
static int emc1403_set_temp(struct thermal_data *data, int channel,
enum emc1403_reg_map map, long val)
{
unsigned int regval;
int ret;
u8 regh;
s8 regl;
regh = emc1403_temp_regs[channel][map];
regl = emc1403_temp_regs_low[channel][map];
mutex_lock(&data->mutex);
if (regl >= 0) {
if (data->chip == emc1428)
val = clamp_val(val, -128000, 127875);
else
val = clamp_val(val, 0, 255875);
regval = DIV_ROUND_CLOSEST(val, 125);
ret = regmap_write(data->regmap, regh, (regval >> 3) & 0xff);
if (ret < 0)
goto unlock;
ret = regmap_write(data->regmap, regl, (regval & 0x07) << 5);
} else {
if (data->chip == emc1428)
val = clamp_val(val, -128000, 127000);
else
val = clamp_val(val, 0, 255000);
regval = DIV_ROUND_CLOSEST(val, 1000);
ret = regmap_write(data->regmap, regh, regval);
}
unlock:
mutex_unlock(&data->mutex);
return ret;
}
static int emc1403_temp_write(struct thermal_data *data, u32 attr, int channel, long val)
{
switch (attr) {
case hwmon_temp_min:
case hwmon_temp_max:
case hwmon_temp_crit:
return emc1403_set_temp(data, channel, ema1403_temp_map[attr], val);
case hwmon_temp_crit_hyst:
return emc1403_set_hyst(data, val);
default:
return -EOPNOTSUPP;
}
}
/* Lookup table for temperature conversion times in msec */
static const u16 ina3221_conv_time[] = {
16000, 8000, 4000, 2000, 1000, 500, 250, 125, 62, 31, 16
};
static int emc1403_set_convrate(struct thermal_data *data, unsigned int interval)
{
int convrate;
convrate = find_closest_descending(interval, ina3221_conv_time,
ARRAY_SIZE(ina3221_conv_time));
return regmap_write(data->regmap, 0x04, convrate);
}
static int emc1403_chip_write(struct thermal_data *data, u32 attr, long val)
{
switch (attr) {
case hwmon_chip_update_interval:
return emc1403_set_convrate(data, clamp_val(val, 0, 100000));
default:
return -EOPNOTSUPP;
}
}
static int emc1403_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
struct thermal_data *data = dev_get_drvdata(dev);
switch (type) {
case hwmon_temp:
return emc1403_temp_write(data, attr, channel, val);
case hwmon_chip:
return emc1403_chip_write(data, attr, val);
default:
return -EOPNOTSUPP;
}
}
static umode_t emc1403_temp_is_visible(const void *_data, u32 attr, int channel)
{
const struct thermal_data *data = _data;
if (data->chip == emc1402 && channel > 1)
return 0;
if (data->chip == emc1403 && channel > 2)
return 0;
if (data->chip != emc1428 && channel > 3)
return 0;
switch (attr) {
case hwmon_temp_input:
case hwmon_temp_min_alarm:
case hwmon_temp_max_alarm:
case hwmon_temp_crit_alarm:
case hwmon_temp_fault:
case hwmon_temp_min_hyst:
case hwmon_temp_max_hyst:
return 0444;
case hwmon_temp_min:
case hwmon_temp_max:
case hwmon_temp_crit:
return 0644;
case hwmon_temp_crit_hyst:
if (channel == 0)
return 0644;
return 0444;
default:
return 0;
}
}
static umode_t emc1403_chip_is_visible(const void *_data, u32 attr)
{
switch (attr) {
case hwmon_chip_update_interval:
return 0644;
default:
return 0;
}
}
static umode_t emc1403_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
switch (type) {
case hwmon_temp:
return emc1403_temp_is_visible(data, attr, channel);
case hwmon_chip:
return emc1403_chip_is_visible(data, attr);
default:
return 0;
}
}
static const struct hwmon_channel_info * const emc1403_info[] = {
HWMON_CHANNEL_INFO(chip, HWMON_C_UPDATE_INTERVAL),
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM,
HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,
HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,
HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,
HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,
HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,
HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,
HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT
),
NULL
};
static const struct hwmon_ops emc1403_hwmon_ops = {
.is_visible = emc1403_is_visible,
.read = emc1403_read,
.write = emc1403_write,
};
static const struct hwmon_chip_info emc1403_chip_info = {
.ops = &emc1403_hwmon_ops,
.info = emc1403_info,
};
/* Last digit of chip name indicates number of channels */
static const struct i2c_device_id emc1403_idtable[] = {
{ "emc1402", emc1402 },
{ "emc1403", emc1403 },
{ "emc1404", emc1404 },
{ "emc1412", emc1402 },
{ "emc1413", emc1403 },
{ "emc1414", emc1404 },
{ "emc1422", emc1402 },
{ "emc1423", emc1403 },
{ "emc1424", emc1404 },
{ "emc1428", emc1428 },
{ "emc1438", emc1428 },
{ "emc1442", emc1402 },
{ }
};
MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
static int emc1403_probe(struct i2c_client *client)
{
struct thermal_data *data;
struct device *hwmon_dev;
const struct i2c_device_id *id = i2c_match_id(emc1403_idtable, client);
data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
data->chip = id->driver_data;
data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
if (IS_ERR(data->regmap))
return PTR_ERR(data->regmap);
mutex_init(&data->mutex);
hwmon_dev = devm_hwmon_device_register_with_info(&client->dev,
client->name, data,
&emc1403_chip_info,
emc1403_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const unsigned short emc1403_address_list[] = {
0x18, 0x1c, 0x29, 0x3c, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
};
static struct i2c_driver sensor_emc1403 = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "emc1403",
},
.detect = emc1403_detect,
.probe = emc1403_probe,
.id_table = emc1403_idtable,
.address_list = emc1403_address_list,
};
module_i2c_driver(sensor_emc1403);
MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
MODULE_DESCRIPTION("emc1403 Thermal Driver");
MODULE_LICENSE("GPL v2");