mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-09-21 12:11:49 +08:00
c21eced115
Convert driver to with_info hwmon API to simplify the code and to reduce its size. No functional change. Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
439 lines
10 KiB
C
439 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* lm92 - Hardware monitoring driver
|
|
* Copyright (C) 2005-2008 Jean Delvare <jdelvare@suse.de>
|
|
*
|
|
* Based on the lm90 driver, with some ideas taken from the lm_sensors
|
|
* lm92 driver as well.
|
|
*
|
|
* The LM92 is a sensor chip made by National Semiconductor. It reports
|
|
* its own temperature with a 0.0625 deg resolution and a 0.33 deg
|
|
* accuracy. Complete datasheet can be obtained from National's website
|
|
* at:
|
|
* http://www.national.com/pf/LM/LM92.html
|
|
*
|
|
* This driver also supports the MAX6635 sensor chip made by Maxim.
|
|
* This chip is compatible with the LM92, but has a lesser accuracy
|
|
* (1.0 deg). Complete datasheet can be obtained from Maxim's website
|
|
* at:
|
|
* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3074
|
|
*
|
|
* Since the LM92 was the first chipset supported by this driver, most
|
|
* comments will refer to this chipset, but are actually general and
|
|
* concern all supported chipsets, unless mentioned otherwise.
|
|
*
|
|
* Support could easily be added for the National Semiconductor LM76
|
|
* and Maxim MAX6633 and MAX6634 chips, which are mostly compatible
|
|
* with the LM92.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/slab.h>
|
|
|
|
/*
|
|
* The LM92 and MAX6635 have 2 two-state pins for address selection,
|
|
* resulting in 4 possible addresses.
|
|
*/
|
|
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
|
|
I2C_CLIENT_END };
|
|
/* The LM92 registers */
|
|
#define LM92_REG_CONFIG 0x01 /* 8-bit, RW */
|
|
#define LM92_REG_TEMP 0x00 /* 16-bit, RO */
|
|
#define LM92_REG_TEMP_HYST 0x02 /* 16-bit, RW */
|
|
#define LM92_REG_TEMP_CRIT 0x03 /* 16-bit, RW */
|
|
#define LM92_REG_TEMP_LOW 0x04 /* 16-bit, RW */
|
|
#define LM92_REG_TEMP_HIGH 0x05 /* 16-bit, RW */
|
|
#define LM92_REG_MAN_ID 0x07 /* 16-bit, RO, LM92 only */
|
|
|
|
/*
|
|
* The LM92 uses signed 13-bit values with LSB = 0.0625 degree Celsius,
|
|
* left-justified in 16-bit registers. No rounding is done, with such
|
|
* a resolution it's just not worth it. Note that the MAX6635 doesn't
|
|
* make use of the 4 lower bits for limits (i.e. effective resolution
|
|
* for limits is 1 degree Celsius).
|
|
*/
|
|
static inline int TEMP_FROM_REG(s16 reg)
|
|
{
|
|
return reg / 8 * 625 / 10;
|
|
}
|
|
|
|
static inline s16 TEMP_TO_REG(long val, int resolution)
|
|
{
|
|
val = clamp_val(val, -60000, 160000);
|
|
return DIV_ROUND_CLOSEST(val << (resolution - 9), 1000) << (16 - resolution);
|
|
}
|
|
|
|
/* Alarm flags are stored in the 3 LSB of the temperature register */
|
|
static inline u8 ALARMS_FROM_REG(s16 reg)
|
|
{
|
|
return reg & 0x0007;
|
|
}
|
|
|
|
/* Client data (each client gets its own) */
|
|
struct lm92_data {
|
|
struct regmap *regmap;
|
|
struct mutex update_lock;
|
|
int resolution;
|
|
};
|
|
|
|
static int lm92_temp_read(struct lm92_data *data, u32 attr, int channel, long *val)
|
|
{
|
|
int reg = -1, hyst_reg = -1, alarm_bit = 0;
|
|
struct regmap *regmap = data->regmap;
|
|
u32 temp;
|
|
int ret;
|
|
|
|
switch (attr) {
|
|
case hwmon_temp_input:
|
|
reg = LM92_REG_TEMP;
|
|
break;
|
|
case hwmon_temp_min:
|
|
reg = LM92_REG_TEMP_LOW;
|
|
break;
|
|
case hwmon_temp_max:
|
|
reg = LM92_REG_TEMP_HIGH;
|
|
break;
|
|
case hwmon_temp_crit:
|
|
reg = LM92_REG_TEMP_CRIT;
|
|
break;
|
|
case hwmon_temp_min_hyst:
|
|
hyst_reg = LM92_REG_TEMP_LOW;
|
|
break;
|
|
case hwmon_temp_max_hyst:
|
|
hyst_reg = LM92_REG_TEMP_HIGH;
|
|
break;
|
|
case hwmon_temp_crit_hyst:
|
|
hyst_reg = LM92_REG_TEMP_CRIT;
|
|
break;
|
|
case hwmon_temp_min_alarm:
|
|
alarm_bit = 0;
|
|
break;
|
|
case hwmon_temp_max_alarm:
|
|
alarm_bit = 1;
|
|
break;
|
|
case hwmon_temp_crit_alarm:
|
|
alarm_bit = 2;
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
if (reg >= 0) {
|
|
ret = regmap_read(regmap, reg, &temp);
|
|
if (ret < 0)
|
|
return ret;
|
|
*val = TEMP_FROM_REG(temp);
|
|
} else if (hyst_reg >= 0) {
|
|
u32 regs[2] = { hyst_reg, LM92_REG_TEMP_HYST };
|
|
u16 regvals[2];
|
|
|
|
ret = regmap_multi_reg_read(regmap, regs, regvals, 2);
|
|
if (ret)
|
|
return ret;
|
|
if (attr == hwmon_temp_min_hyst)
|
|
*val = TEMP_FROM_REG(regvals[0]) + TEMP_FROM_REG(regvals[1]);
|
|
else
|
|
*val = TEMP_FROM_REG(regvals[0]) - TEMP_FROM_REG(regvals[1]);
|
|
} else {
|
|
ret = regmap_read(regmap, LM92_REG_TEMP, &temp);
|
|
if (ret)
|
|
return ret;
|
|
*val = !!(temp & BIT(alarm_bit));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int lm92_chip_read(struct lm92_data *data, u32 attr, long *val)
|
|
{
|
|
u32 temp;
|
|
int ret;
|
|
|
|
switch (attr) {
|
|
case hwmon_chip_alarms:
|
|
ret = regmap_read(data->regmap, LM92_REG_TEMP, &temp);
|
|
if (ret)
|
|
return ret;
|
|
*val = ALARMS_FROM_REG(temp);
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int lm92_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
|
|
int channel, long *val)
|
|
{
|
|
struct lm92_data *data = dev_get_drvdata(dev);
|
|
|
|
switch (type) {
|
|
case hwmon_chip:
|
|
return lm92_chip_read(data, attr, val);
|
|
case hwmon_temp:
|
|
return lm92_temp_read(data, attr, channel, val);
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
static int lm92_temp_write(struct lm92_data *data, u32 attr, long val)
|
|
{
|
|
struct regmap *regmap = data->regmap;
|
|
int reg, err;
|
|
u32 temp;
|
|
|
|
switch (attr) {
|
|
case hwmon_temp_min:
|
|
reg = LM92_REG_TEMP_LOW;
|
|
break;
|
|
case hwmon_temp_max:
|
|
reg = LM92_REG_TEMP_HIGH;
|
|
break;
|
|
case hwmon_temp_crit:
|
|
reg = LM92_REG_TEMP_CRIT;
|
|
break;
|
|
case hwmon_temp_crit_hyst:
|
|
val = clamp_val(val, -120000, 220000);
|
|
mutex_lock(&data->update_lock);
|
|
err = regmap_read(regmap, LM92_REG_TEMP_CRIT, &temp);
|
|
if (err)
|
|
goto unlock;
|
|
val = TEMP_TO_REG(TEMP_FROM_REG(temp) - val, data->resolution);
|
|
err = regmap_write(regmap, LM92_REG_TEMP_HYST, val);
|
|
unlock:
|
|
mutex_unlock(&data->update_lock);
|
|
return err;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
return regmap_write(regmap, reg, TEMP_TO_REG(val, data->resolution));
|
|
}
|
|
|
|
static int lm92_write(struct device *dev, enum hwmon_sensor_types type,
|
|
u32 attr, int channel, long val)
|
|
{
|
|
struct lm92_data *data = dev_get_drvdata(dev);
|
|
|
|
switch (type) {
|
|
case hwmon_temp:
|
|
return lm92_temp_write(data, attr, val);
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
static umode_t lm92_is_visible(const void *_data, enum hwmon_sensor_types type,
|
|
u32 attr, int channel)
|
|
{
|
|
switch (type) {
|
|
case hwmon_chip:
|
|
switch (attr) {
|
|
case hwmon_chip_alarms:
|
|
return 0444;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case hwmon_temp:
|
|
switch (attr) {
|
|
case hwmon_temp_min:
|
|
case hwmon_temp_max:
|
|
case hwmon_temp_crit:
|
|
case hwmon_temp_crit_hyst:
|
|
return 0644;
|
|
case hwmon_temp_input:
|
|
case hwmon_temp_min_hyst:
|
|
case hwmon_temp_max_hyst:
|
|
case hwmon_temp_min_alarm:
|
|
case hwmon_temp_max_alarm:
|
|
case hwmon_temp_crit_alarm:
|
|
return 0444;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct hwmon_channel_info * const lm92_info[] = {
|
|
HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS),
|
|
HWMON_CHANNEL_INFO(temp,
|
|
HWMON_T_INPUT |
|
|
HWMON_T_MIN | HWMON_T_MIN_HYST |
|
|
HWMON_T_MAX | HWMON_T_MAX_HYST |
|
|
HWMON_T_CRIT | HWMON_T_CRIT_HYST |
|
|
HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
|
|
HWMON_T_CRIT_ALARM),
|
|
NULL
|
|
};
|
|
|
|
static const struct hwmon_ops lm92_hwmon_ops = {
|
|
.is_visible = lm92_is_visible,
|
|
.read = lm92_read,
|
|
.write = lm92_write,
|
|
};
|
|
|
|
static const struct hwmon_chip_info lm92_chip_info = {
|
|
.ops = &lm92_hwmon_ops,
|
|
.info = lm92_info,
|
|
};
|
|
|
|
/*
|
|
* Detection and registration
|
|
*/
|
|
|
|
static int lm92_init_client(struct regmap *regmap)
|
|
{
|
|
return regmap_clear_bits(regmap, LM92_REG_CONFIG, 0x01);
|
|
}
|
|
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */
|
|
static int lm92_detect(struct i2c_client *new_client,
|
|
struct i2c_board_info *info)
|
|
{
|
|
struct i2c_adapter *adapter = new_client->adapter;
|
|
u8 config_addr = LM92_REG_CONFIG;
|
|
u8 man_id_addr = LM92_REG_MAN_ID;
|
|
int i, regval;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
|
|
| I2C_FUNC_SMBUS_WORD_DATA))
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* Register values repeat with multiples of 8.
|
|
* Read twice to improve detection accuracy.
|
|
*/
|
|
for (i = 0; i < 2; i++) {
|
|
regval = i2c_smbus_read_word_data(new_client, man_id_addr);
|
|
if (regval != 0x0180)
|
|
return -ENODEV;
|
|
regval = i2c_smbus_read_byte_data(new_client, config_addr);
|
|
if (regval < 0 || (regval & 0xe0))
|
|
return -ENODEV;
|
|
config_addr += 8;
|
|
man_id_addr += 8;
|
|
}
|
|
|
|
strscpy(info->type, "lm92", I2C_NAME_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* regmap */
|
|
|
|
static int lm92_reg_read(void *context, unsigned int reg, unsigned int *val)
|
|
{
|
|
int ret;
|
|
|
|
if (reg == LM92_REG_CONFIG)
|
|
ret = i2c_smbus_read_byte_data(context, reg);
|
|
else
|
|
ret = i2c_smbus_read_word_swapped(context, reg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*val = ret;
|
|
return 0;
|
|
}
|
|
|
|
static int lm92_reg_write(void *context, unsigned int reg, unsigned int val)
|
|
{
|
|
if (reg == LM92_REG_CONFIG)
|
|
return i2c_smbus_write_byte_data(context, LM92_REG_CONFIG, val);
|
|
|
|
return i2c_smbus_write_word_swapped(context, reg, val);
|
|
}
|
|
|
|
static bool lm92_regmap_is_volatile(struct device *dev, unsigned int reg)
|
|
{
|
|
return reg == LM92_REG_TEMP;
|
|
}
|
|
|
|
static bool lm92_regmap_is_writeable(struct device *dev, unsigned int reg)
|
|
{
|
|
return reg >= LM92_REG_CONFIG;
|
|
}
|
|
|
|
static const struct regmap_config lm92_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 16,
|
|
.max_register = LM92_REG_TEMP_HIGH,
|
|
.cache_type = REGCACHE_MAPLE,
|
|
.volatile_reg = lm92_regmap_is_volatile,
|
|
.writeable_reg = lm92_regmap_is_writeable,
|
|
};
|
|
|
|
static const struct regmap_bus lm92_regmap_bus = {
|
|
.reg_write = lm92_reg_write,
|
|
.reg_read = lm92_reg_read,
|
|
};
|
|
|
|
static int lm92_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct device *hwmon_dev;
|
|
struct lm92_data *data;
|
|
struct regmap *regmap;
|
|
int err;
|
|
|
|
regmap = devm_regmap_init(dev, &lm92_regmap_bus, client,
|
|
&lm92_regmap_config);
|
|
if (IS_ERR(regmap))
|
|
return PTR_ERR(regmap);
|
|
|
|
data = devm_kzalloc(dev, sizeof(struct lm92_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->regmap = regmap;
|
|
data->resolution = (unsigned long)i2c_get_match_data(client);
|
|
mutex_init(&data->update_lock);
|
|
|
|
/* Initialize the chipset */
|
|
err = lm92_init_client(regmap);
|
|
if (err)
|
|
return err;
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
|
|
&lm92_chip_info, NULL);
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
|
}
|
|
|
|
/*
|
|
* Module and driver stuff
|
|
*/
|
|
|
|
/* .driver_data is limit register resolution */
|
|
static const struct i2c_device_id lm92_id[] = {
|
|
{ "lm92", 13 },
|
|
{ "max6635", 9 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lm92_id);
|
|
|
|
static struct i2c_driver lm92_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "lm92",
|
|
},
|
|
.probe = lm92_probe,
|
|
.id_table = lm92_id,
|
|
.detect = lm92_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
module_i2c_driver(lm92_driver);
|
|
|
|
MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
|
|
MODULE_DESCRIPTION("LM92/MAX6635 driver");
|
|
MODULE_LICENSE("GPL");
|