forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
610 lines
15 KiB
610 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Copyright (C) 2011 Alexander Stein <[email protected]> |
|
* |
|
* The LM95245 is a sensor chip made by TI / National Semiconductor. |
|
* It reports up to two temperatures (its own plus an external one). |
|
* |
|
* This driver is based on lm95241.c |
|
*/ |
|
|
|
#include <linux/err.h> |
|
#include <linux/init.h> |
|
#include <linux/hwmon.h> |
|
#include <linux/i2c.h> |
|
#include <linux/module.h> |
|
#include <linux/mutex.h> |
|
#include <linux/regmap.h> |
|
#include <linux/slab.h> |
|
|
|
static const unsigned short normal_i2c[] = { |
|
0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END }; |
|
|
|
/* LM95245 registers */ |
|
/* general registers */ |
|
#define LM95245_REG_RW_CONFIG1 0x03 |
|
#define LM95245_REG_RW_CONVERS_RATE 0x04 |
|
#define LM95245_REG_W_ONE_SHOT 0x0F |
|
|
|
/* diode configuration */ |
|
#define LM95245_REG_RW_CONFIG2 0xBF |
|
#define LM95245_REG_RW_REMOTE_OFFH 0x11 |
|
#define LM95245_REG_RW_REMOTE_OFFL 0x12 |
|
|
|
/* status registers */ |
|
#define LM95245_REG_R_STATUS1 0x02 |
|
#define LM95245_REG_R_STATUS2 0x33 |
|
|
|
/* limit registers */ |
|
#define LM95245_REG_RW_REMOTE_OS_LIMIT 0x07 |
|
#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT 0x20 |
|
#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT 0x19 |
|
#define LM95245_REG_RW_COMMON_HYSTERESIS 0x21 |
|
|
|
/* temperature signed */ |
|
#define LM95245_REG_R_LOCAL_TEMPH_S 0x00 |
|
#define LM95245_REG_R_LOCAL_TEMPL_S 0x30 |
|
#define LM95245_REG_R_REMOTE_TEMPH_S 0x01 |
|
#define LM95245_REG_R_REMOTE_TEMPL_S 0x10 |
|
/* temperature unsigned */ |
|
#define LM95245_REG_R_REMOTE_TEMPH_U 0x31 |
|
#define LM95245_REG_R_REMOTE_TEMPL_U 0x32 |
|
|
|
/* id registers */ |
|
#define LM95245_REG_R_MAN_ID 0xFE |
|
#define LM95245_REG_R_CHIP_ID 0xFF |
|
|
|
/* LM95245 specific bitfields */ |
|
#define CFG_STOP 0x40 |
|
#define CFG_REMOTE_TCRIT_MASK 0x10 |
|
#define CFG_REMOTE_OS_MASK 0x08 |
|
#define CFG_LOCAL_TCRIT_MASK 0x04 |
|
#define CFG_LOCAL_OS_MASK 0x02 |
|
|
|
#define CFG2_OS_A0 0x40 |
|
#define CFG2_DIODE_FAULT_OS 0x20 |
|
#define CFG2_DIODE_FAULT_TCRIT 0x10 |
|
#define CFG2_REMOTE_TT 0x08 |
|
#define CFG2_REMOTE_FILTER_DIS 0x00 |
|
#define CFG2_REMOTE_FILTER_EN 0x06 |
|
|
|
/* conversation rate in ms */ |
|
#define RATE_CR0063 0x00 |
|
#define RATE_CR0364 0x01 |
|
#define RATE_CR1000 0x02 |
|
#define RATE_CR2500 0x03 |
|
|
|
#define STATUS1_ROS 0x10 |
|
#define STATUS1_DIODE_FAULT 0x04 |
|
#define STATUS1_RTCRIT 0x02 |
|
#define STATUS1_LOC 0x01 |
|
|
|
#define MANUFACTURER_ID 0x01 |
|
#define LM95235_REVISION 0xB1 |
|
#define LM95245_REVISION 0xB3 |
|
|
|
/* Client data (each client gets its own) */ |
|
struct lm95245_data { |
|
struct regmap *regmap; |
|
struct mutex update_lock; |
|
int interval; /* in msecs */ |
|
}; |
|
|
|
/* Conversions */ |
|
static int temp_from_reg_unsigned(u8 val_h, u8 val_l) |
|
{ |
|
return val_h * 1000 + val_l * 1000 / 256; |
|
} |
|
|
|
static int temp_from_reg_signed(u8 val_h, u8 val_l) |
|
{ |
|
if (val_h & 0x80) |
|
return (val_h - 0x100) * 1000; |
|
return temp_from_reg_unsigned(val_h, val_l); |
|
} |
|
|
|
static int lm95245_read_conversion_rate(struct lm95245_data *data) |
|
{ |
|
unsigned int rate; |
|
int ret; |
|
|
|
ret = regmap_read(data->regmap, LM95245_REG_RW_CONVERS_RATE, &rate); |
|
if (ret < 0) |
|
return ret; |
|
|
|
switch (rate) { |
|
case RATE_CR0063: |
|
data->interval = 63; |
|
break; |
|
case RATE_CR0364: |
|
data->interval = 364; |
|
break; |
|
case RATE_CR1000: |
|
data->interval = 1000; |
|
break; |
|
case RATE_CR2500: |
|
default: |
|
data->interval = 2500; |
|
break; |
|
} |
|
return 0; |
|
} |
|
|
|
static int lm95245_set_conversion_rate(struct lm95245_data *data, long interval) |
|
{ |
|
int ret, rate; |
|
|
|
if (interval <= 63) { |
|
interval = 63; |
|
rate = RATE_CR0063; |
|
} else if (interval <= 364) { |
|
interval = 364; |
|
rate = RATE_CR0364; |
|
} else if (interval <= 1000) { |
|
interval = 1000; |
|
rate = RATE_CR1000; |
|
} else { |
|
interval = 2500; |
|
rate = RATE_CR2500; |
|
} |
|
|
|
ret = regmap_write(data->regmap, LM95245_REG_RW_CONVERS_RATE, rate); |
|
if (ret < 0) |
|
return ret; |
|
|
|
data->interval = interval; |
|
return 0; |
|
} |
|
|
|
static int lm95245_read_temp(struct device *dev, u32 attr, int channel, |
|
long *val) |
|
{ |
|
struct lm95245_data *data = dev_get_drvdata(dev); |
|
struct regmap *regmap = data->regmap; |
|
int ret, regl, regh, regvall, regvalh; |
|
|
|
switch (attr) { |
|
case hwmon_temp_input: |
|
regl = channel ? LM95245_REG_R_REMOTE_TEMPL_S : |
|
LM95245_REG_R_LOCAL_TEMPL_S; |
|
regh = channel ? LM95245_REG_R_REMOTE_TEMPH_S : |
|
LM95245_REG_R_LOCAL_TEMPH_S; |
|
ret = regmap_read(regmap, regl, ®vall); |
|
if (ret < 0) |
|
return ret; |
|
ret = regmap_read(regmap, regh, ®valh); |
|
if (ret < 0) |
|
return ret; |
|
/* |
|
* Local temp is always signed. |
|
* Remote temp has both signed and unsigned data. |
|
* Use signed calculation for remote if signed bit is set |
|
* or if reported temperature is below signed limit. |
|
*/ |
|
if (!channel || (regvalh & 0x80) || regvalh < 0x7f) { |
|
*val = temp_from_reg_signed(regvalh, regvall); |
|
return 0; |
|
} |
|
ret = regmap_read(regmap, LM95245_REG_R_REMOTE_TEMPL_U, |
|
®vall); |
|
if (ret < 0) |
|
return ret; |
|
ret = regmap_read(regmap, LM95245_REG_R_REMOTE_TEMPH_U, |
|
®valh); |
|
if (ret < 0) |
|
return ret; |
|
*val = temp_from_reg_unsigned(regvalh, regvall); |
|
return 0; |
|
case hwmon_temp_max: |
|
ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT, |
|
®valh); |
|
if (ret < 0) |
|
return ret; |
|
*val = regvalh * 1000; |
|
return 0; |
|
case hwmon_temp_crit: |
|
regh = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT : |
|
LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT; |
|
ret = regmap_read(regmap, regh, ®valh); |
|
if (ret < 0) |
|
return ret; |
|
*val = regvalh * 1000; |
|
return 0; |
|
case hwmon_temp_max_hyst: |
|
ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT, |
|
®valh); |
|
if (ret < 0) |
|
return ret; |
|
ret = regmap_read(regmap, LM95245_REG_RW_COMMON_HYSTERESIS, |
|
®vall); |
|
if (ret < 0) |
|
return ret; |
|
*val = (regvalh - regvall) * 1000; |
|
return 0; |
|
case hwmon_temp_crit_hyst: |
|
regh = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT : |
|
LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT; |
|
ret = regmap_read(regmap, regh, ®valh); |
|
if (ret < 0) |
|
return ret; |
|
ret = regmap_read(regmap, LM95245_REG_RW_COMMON_HYSTERESIS, |
|
®vall); |
|
if (ret < 0) |
|
return ret; |
|
*val = (regvalh - regvall) * 1000; |
|
return 0; |
|
case hwmon_temp_type: |
|
ret = regmap_read(regmap, LM95245_REG_RW_CONFIG2, ®valh); |
|
if (ret < 0) |
|
return ret; |
|
*val = (regvalh & CFG2_REMOTE_TT) ? 1 : 2; |
|
return 0; |
|
case hwmon_temp_offset: |
|
ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OFFL, |
|
®vall); |
|
if (ret < 0) |
|
return ret; |
|
ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OFFH, |
|
®valh); |
|
if (ret < 0) |
|
return ret; |
|
*val = temp_from_reg_signed(regvalh, regvall); |
|
return 0; |
|
case hwmon_temp_max_alarm: |
|
ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh); |
|
if (ret < 0) |
|
return ret; |
|
*val = !!(regvalh & STATUS1_ROS); |
|
return 0; |
|
case hwmon_temp_crit_alarm: |
|
ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh); |
|
if (ret < 0) |
|
return ret; |
|
*val = !!(regvalh & (channel ? STATUS1_RTCRIT : STATUS1_LOC)); |
|
return 0; |
|
case hwmon_temp_fault: |
|
ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh); |
|
if (ret < 0) |
|
return ret; |
|
*val = !!(regvalh & STATUS1_DIODE_FAULT); |
|
return 0; |
|
default: |
|
return -EOPNOTSUPP; |
|
} |
|
} |
|
|
|
static int lm95245_write_temp(struct device *dev, u32 attr, int channel, |
|
long val) |
|
{ |
|
struct lm95245_data *data = dev_get_drvdata(dev); |
|
struct regmap *regmap = data->regmap; |
|
unsigned int regval; |
|
int ret, reg; |
|
|
|
switch (attr) { |
|
case hwmon_temp_max: |
|
val = clamp_val(val / 1000, 0, 255); |
|
ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT, val); |
|
return ret; |
|
case hwmon_temp_crit: |
|
reg = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT : |
|
LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT; |
|
val = clamp_val(val / 1000, 0, channel ? 255 : 127); |
|
ret = regmap_write(regmap, reg, val); |
|
return ret; |
|
case hwmon_temp_crit_hyst: |
|
mutex_lock(&data->update_lock); |
|
ret = regmap_read(regmap, LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT, |
|
®val); |
|
if (ret < 0) { |
|
mutex_unlock(&data->update_lock); |
|
return ret; |
|
} |
|
/* Clamp to reasonable range to prevent overflow */ |
|
val = clamp_val(val, -1000000, 1000000); |
|
val = regval - val / 1000; |
|
val = clamp_val(val, 0, 31); |
|
ret = regmap_write(regmap, LM95245_REG_RW_COMMON_HYSTERESIS, |
|
val); |
|
mutex_unlock(&data->update_lock); |
|
return ret; |
|
case hwmon_temp_offset: |
|
val = clamp_val(val, -128000, 127875); |
|
val = val * 256 / 1000; |
|
mutex_lock(&data->update_lock); |
|
ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OFFL, |
|
val & 0xe0); |
|
if (ret < 0) { |
|
mutex_unlock(&data->update_lock); |
|
return ret; |
|
} |
|
ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OFFH, |
|
(val >> 8) & 0xff); |
|
mutex_unlock(&data->update_lock); |
|
return ret; |
|
case hwmon_temp_type: |
|
if (val != 1 && val != 2) |
|
return -EINVAL; |
|
ret = regmap_update_bits(regmap, LM95245_REG_RW_CONFIG2, |
|
CFG2_REMOTE_TT, |
|
val == 1 ? CFG2_REMOTE_TT : 0); |
|
return ret; |
|
default: |
|
return -EOPNOTSUPP; |
|
} |
|
} |
|
|
|
static int lm95245_read_chip(struct device *dev, u32 attr, int channel, |
|
long *val) |
|
{ |
|
struct lm95245_data *data = dev_get_drvdata(dev); |
|
|
|
switch (attr) { |
|
case hwmon_chip_update_interval: |
|
*val = data->interval; |
|
return 0; |
|
default: |
|
return -EOPNOTSUPP; |
|
} |
|
} |
|
|
|
static int lm95245_write_chip(struct device *dev, u32 attr, int channel, |
|
long val) |
|
{ |
|
struct lm95245_data *data = dev_get_drvdata(dev); |
|
int ret; |
|
|
|
switch (attr) { |
|
case hwmon_chip_update_interval: |
|
mutex_lock(&data->update_lock); |
|
ret = lm95245_set_conversion_rate(data, val); |
|
mutex_unlock(&data->update_lock); |
|
return ret; |
|
default: |
|
return -EOPNOTSUPP; |
|
} |
|
} |
|
|
|
static int lm95245_read(struct device *dev, enum hwmon_sensor_types type, |
|
u32 attr, int channel, long *val) |
|
{ |
|
switch (type) { |
|
case hwmon_chip: |
|
return lm95245_read_chip(dev, attr, channel, val); |
|
case hwmon_temp: |
|
return lm95245_read_temp(dev, attr, channel, val); |
|
default: |
|
return -EOPNOTSUPP; |
|
} |
|
} |
|
|
|
static int lm95245_write(struct device *dev, enum hwmon_sensor_types type, |
|
u32 attr, int channel, long val) |
|
{ |
|
switch (type) { |
|
case hwmon_chip: |
|
return lm95245_write_chip(dev, attr, channel, val); |
|
case hwmon_temp: |
|
return lm95245_write_temp(dev, attr, channel, val); |
|
default: |
|
return -EOPNOTSUPP; |
|
} |
|
} |
|
|
|
static umode_t lm95245_temp_is_visible(const void *data, u32 attr, int channel) |
|
{ |
|
switch (attr) { |
|
case hwmon_temp_input: |
|
case hwmon_temp_max_alarm: |
|
case hwmon_temp_max_hyst: |
|
case hwmon_temp_crit_alarm: |
|
case hwmon_temp_fault: |
|
return 0444; |
|
case hwmon_temp_type: |
|
case hwmon_temp_max: |
|
case hwmon_temp_crit: |
|
case hwmon_temp_offset: |
|
return 0644; |
|
case hwmon_temp_crit_hyst: |
|
return (channel == 0) ? 0644 : 0444; |
|
default: |
|
return 0; |
|
} |
|
} |
|
|
|
static umode_t lm95245_is_visible(const void *data, |
|
enum hwmon_sensor_types type, |
|
u32 attr, int channel) |
|
{ |
|
switch (type) { |
|
case hwmon_chip: |
|
switch (attr) { |
|
case hwmon_chip_update_interval: |
|
return 0644; |
|
default: |
|
return 0; |
|
} |
|
case hwmon_temp: |
|
return lm95245_temp_is_visible(data, attr, channel); |
|
default: |
|
return 0; |
|
} |
|
} |
|
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */ |
|
static int lm95245_detect(struct i2c_client *new_client, |
|
struct i2c_board_info *info) |
|
{ |
|
struct i2c_adapter *adapter = new_client->adapter; |
|
int address = new_client->addr; |
|
const char *name; |
|
int rev, id; |
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
|
return -ENODEV; |
|
|
|
id = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID); |
|
if (id != MANUFACTURER_ID) |
|
return -ENODEV; |
|
|
|
rev = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID); |
|
switch (rev) { |
|
case LM95235_REVISION: |
|
if (address != 0x18 && address != 0x29 && address != 0x4c) |
|
return -ENODEV; |
|
name = "lm95235"; |
|
break; |
|
case LM95245_REVISION: |
|
name = "lm95245"; |
|
break; |
|
default: |
|
return -ENODEV; |
|
} |
|
|
|
strlcpy(info->type, name, I2C_NAME_SIZE); |
|
return 0; |
|
} |
|
|
|
static int lm95245_init_client(struct lm95245_data *data) |
|
{ |
|
int ret; |
|
|
|
ret = lm95245_read_conversion_rate(data); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return regmap_update_bits(data->regmap, LM95245_REG_RW_CONFIG1, |
|
CFG_STOP, 0); |
|
} |
|
|
|
static bool lm95245_is_writeable_reg(struct device *dev, unsigned int reg) |
|
{ |
|
switch (reg) { |
|
case LM95245_REG_RW_CONFIG1: |
|
case LM95245_REG_RW_CONVERS_RATE: |
|
case LM95245_REG_W_ONE_SHOT: |
|
case LM95245_REG_RW_CONFIG2: |
|
case LM95245_REG_RW_REMOTE_OFFH: |
|
case LM95245_REG_RW_REMOTE_OFFL: |
|
case LM95245_REG_RW_REMOTE_OS_LIMIT: |
|
case LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT: |
|
case LM95245_REG_RW_REMOTE_TCRIT_LIMIT: |
|
case LM95245_REG_RW_COMMON_HYSTERESIS: |
|
return true; |
|
default: |
|
return false; |
|
} |
|
} |
|
|
|
static bool lm95245_is_volatile_reg(struct device *dev, unsigned int reg) |
|
{ |
|
switch (reg) { |
|
case LM95245_REG_R_STATUS1: |
|
case LM95245_REG_R_STATUS2: |
|
case LM95245_REG_R_LOCAL_TEMPH_S: |
|
case LM95245_REG_R_LOCAL_TEMPL_S: |
|
case LM95245_REG_R_REMOTE_TEMPH_S: |
|
case LM95245_REG_R_REMOTE_TEMPL_S: |
|
case LM95245_REG_R_REMOTE_TEMPH_U: |
|
case LM95245_REG_R_REMOTE_TEMPL_U: |
|
return true; |
|
default: |
|
return false; |
|
} |
|
} |
|
|
|
static const struct regmap_config lm95245_regmap_config = { |
|
.reg_bits = 8, |
|
.val_bits = 8, |
|
.writeable_reg = lm95245_is_writeable_reg, |
|
.volatile_reg = lm95245_is_volatile_reg, |
|
.cache_type = REGCACHE_RBTREE, |
|
.use_single_read = true, |
|
.use_single_write = true, |
|
}; |
|
|
|
static const struct hwmon_channel_info *lm95245_info[] = { |
|
HWMON_CHANNEL_INFO(chip, |
|
HWMON_C_UPDATE_INTERVAL), |
|
HWMON_CHANNEL_INFO(temp, |
|
HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_HYST | |
|
HWMON_T_CRIT_ALARM, |
|
HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | |
|
HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_FAULT | |
|
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | |
|
HWMON_T_TYPE | HWMON_T_OFFSET), |
|
NULL |
|
}; |
|
|
|
static const struct hwmon_ops lm95245_hwmon_ops = { |
|
.is_visible = lm95245_is_visible, |
|
.read = lm95245_read, |
|
.write = lm95245_write, |
|
}; |
|
|
|
static const struct hwmon_chip_info lm95245_chip_info = { |
|
.ops = &lm95245_hwmon_ops, |
|
.info = lm95245_info, |
|
}; |
|
|
|
static int lm95245_probe(struct i2c_client *client) |
|
{ |
|
struct device *dev = &client->dev; |
|
struct lm95245_data *data; |
|
struct device *hwmon_dev; |
|
int ret; |
|
|
|
data = devm_kzalloc(dev, sizeof(struct lm95245_data), GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
data->regmap = devm_regmap_init_i2c(client, &lm95245_regmap_config); |
|
if (IS_ERR(data->regmap)) |
|
return PTR_ERR(data->regmap); |
|
|
|
mutex_init(&data->update_lock); |
|
|
|
/* Initialize the LM95245 chip */ |
|
ret = lm95245_init_client(data); |
|
if (ret < 0) |
|
return ret; |
|
|
|
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
|
data, |
|
&lm95245_chip_info, |
|
NULL); |
|
return PTR_ERR_OR_ZERO(hwmon_dev); |
|
} |
|
|
|
/* Driver data (common to all clients) */ |
|
static const struct i2c_device_id lm95245_id[] = { |
|
{ "lm95235", 0 }, |
|
{ "lm95245", 0 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, lm95245_id); |
|
|
|
static const struct of_device_id __maybe_unused lm95245_of_match[] = { |
|
{ .compatible = "national,lm95235" }, |
|
{ .compatible = "national,lm95245" }, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, lm95245_of_match); |
|
|
|
static struct i2c_driver lm95245_driver = { |
|
.class = I2C_CLASS_HWMON, |
|
.driver = { |
|
.name = "lm95245", |
|
.of_match_table = of_match_ptr(lm95245_of_match), |
|
}, |
|
.probe_new = lm95245_probe, |
|
.id_table = lm95245_id, |
|
.detect = lm95245_detect, |
|
.address_list = normal_i2c, |
|
}; |
|
|
|
module_i2c_driver(lm95245_driver); |
|
|
|
MODULE_AUTHOR("Alexander Stein <[email protected]>"); |
|
MODULE_DESCRIPTION("LM95235/LM95245 sensor driver"); |
|
MODULE_LICENSE("GPL");
|
|
|