linux/drivers/hwmon/tmp102.c
Stephen Kitt 6748703856 hwmon: use simple i2c probe function
Many hwmon drivers don't use the id information provided by the old
i2c probe function, and the remainder can easily be adapted to the new
form ("probe_new") by calling i2c_match_id explicitly.

This avoids scanning the identifier tables during probes.

Drivers which didn't use the id are converted as-is; drivers which did
are modified as follows:

* if the information in i2c_client is sufficient, that's used instead
  (client->name);
* anything else is handled by calling i2c_match_id() with the same
  level of error-handling (if any) as before.

A few drivers aren't included in this patch because they have a
different set of maintainers. They will be covered by other patches.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Link: https://lore.kernel.org/r/20200813160222.1503401-1-steve@sk2.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-09-23 09:42:39 -07:00

315 lines
7.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/* Texas Instruments TMP102 SMBus temperature sensor driver
*
* Copyright (C) 2010 Steven King <sfking@fdwdc.com>
*/
#include <linux/delay.h>
#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/mutex.h>
#include <linux/device.h>
#include <linux/jiffies.h>
#include <linux/regmap.h>
#include <linux/of.h>
#define DRIVER_NAME "tmp102"
#define TMP102_TEMP_REG 0x00
#define TMP102_CONF_REG 0x01
/* note: these bit definitions are byte swapped */
#define TMP102_CONF_SD 0x0100
#define TMP102_CONF_TM 0x0200
#define TMP102_CONF_POL 0x0400
#define TMP102_CONF_F0 0x0800
#define TMP102_CONF_F1 0x1000
#define TMP102_CONF_R0 0x2000
#define TMP102_CONF_R1 0x4000
#define TMP102_CONF_OS 0x8000
#define TMP102_CONF_EM 0x0010
#define TMP102_CONF_AL 0x0020
#define TMP102_CONF_CR0 0x0040
#define TMP102_CONF_CR1 0x0080
#define TMP102_TLOW_REG 0x02
#define TMP102_THIGH_REG 0x03
#define TMP102_CONFREG_MASK (TMP102_CONF_SD | TMP102_CONF_TM | \
TMP102_CONF_POL | TMP102_CONF_F0 | \
TMP102_CONF_F1 | TMP102_CONF_OS | \
TMP102_CONF_EM | TMP102_CONF_AL | \
TMP102_CONF_CR0 | TMP102_CONF_CR1)
#define TMP102_CONFIG_CLEAR (TMP102_CONF_SD | TMP102_CONF_OS | \
TMP102_CONF_CR0)
#define TMP102_CONFIG_SET (TMP102_CONF_TM | TMP102_CONF_EM | \
TMP102_CONF_CR1)
#define CONVERSION_TIME_MS 35 /* in milli-seconds */
struct tmp102 {
struct regmap *regmap;
u16 config_orig;
unsigned long ready_time;
};
/* convert left adjusted 13-bit TMP102 register value to milliCelsius */
static inline int tmp102_reg_to_mC(s16 val)
{
return ((val & ~0x01) * 1000) / 128;
}
/* convert milliCelsius to left adjusted 13-bit TMP102 register value */
static inline u16 tmp102_mC_to_reg(int val)
{
return (val * 128) / 1000;
}
static int tmp102_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *temp)
{
struct tmp102 *tmp102 = dev_get_drvdata(dev);
unsigned int regval;
int err, reg;
switch (attr) {
case hwmon_temp_input:
/* Is it too early to return a conversion ? */
if (time_before(jiffies, tmp102->ready_time)) {
dev_dbg(dev, "%s: Conversion not ready yet..\n", __func__);
return -EAGAIN;
}
reg = TMP102_TEMP_REG;
break;
case hwmon_temp_max_hyst:
reg = TMP102_TLOW_REG;
break;
case hwmon_temp_max:
reg = TMP102_THIGH_REG;
break;
default:
return -EOPNOTSUPP;
}
err = regmap_read(tmp102->regmap, reg, &regval);
if (err < 0)
return err;
*temp = tmp102_reg_to_mC(regval);
return 0;
}
static int tmp102_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long temp)
{
struct tmp102 *tmp102 = dev_get_drvdata(dev);
int reg;
switch (attr) {
case hwmon_temp_max_hyst:
reg = TMP102_TLOW_REG;
break;
case hwmon_temp_max:
reg = TMP102_THIGH_REG;
break;
default:
return -EOPNOTSUPP;
}
temp = clamp_val(temp, -256000, 255000);
return regmap_write(tmp102->regmap, reg, tmp102_mC_to_reg(temp));
}
static umode_t tmp102_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
if (type != hwmon_temp)
return 0;
switch (attr) {
case hwmon_temp_input:
return 0444;
case hwmon_temp_max_hyst:
case hwmon_temp_max:
return 0644;
default:
return 0;
}
}
static const struct hwmon_channel_info *tmp102_info[] = {
HWMON_CHANNEL_INFO(chip,
HWMON_C_REGISTER_TZ),
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST),
NULL
};
static const struct hwmon_ops tmp102_hwmon_ops = {
.is_visible = tmp102_is_visible,
.read = tmp102_read,
.write = tmp102_write,
};
static const struct hwmon_chip_info tmp102_chip_info = {
.ops = &tmp102_hwmon_ops,
.info = tmp102_info,
};
static void tmp102_restore_config(void *data)
{
struct tmp102 *tmp102 = data;
regmap_write(tmp102->regmap, TMP102_CONF_REG, tmp102->config_orig);
}
static bool tmp102_is_writeable_reg(struct device *dev, unsigned int reg)
{
return reg != TMP102_TEMP_REG;
}
static bool tmp102_is_volatile_reg(struct device *dev, unsigned int reg)
{
return reg == TMP102_TEMP_REG;
}
static const struct regmap_config tmp102_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.max_register = TMP102_THIGH_REG,
.writeable_reg = tmp102_is_writeable_reg,
.volatile_reg = tmp102_is_volatile_reg,
.val_format_endian = REGMAP_ENDIAN_BIG,
.cache_type = REGCACHE_RBTREE,
.use_single_read = true,
.use_single_write = true,
};
static int tmp102_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct device *hwmon_dev;
struct tmp102 *tmp102;
unsigned int regval;
int err;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WORD_DATA)) {
dev_err(dev,
"adapter doesn't support SMBus word transactions\n");
return -ENODEV;
}
tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL);
if (!tmp102)
return -ENOMEM;
i2c_set_clientdata(client, tmp102);
tmp102->regmap = devm_regmap_init_i2c(client, &tmp102_regmap_config);
if (IS_ERR(tmp102->regmap))
return PTR_ERR(tmp102->regmap);
err = regmap_read(tmp102->regmap, TMP102_CONF_REG, &regval);
if (err < 0) {
dev_err(dev, "error reading config register\n");
return err;
}
if ((regval & ~TMP102_CONFREG_MASK) !=
(TMP102_CONF_R0 | TMP102_CONF_R1)) {
dev_err(dev, "unexpected config register value\n");
return -ENODEV;
}
tmp102->config_orig = regval;
err = devm_add_action_or_reset(dev, tmp102_restore_config, tmp102);
if (err)
return err;
regval &= ~TMP102_CONFIG_CLEAR;
regval |= TMP102_CONFIG_SET;
err = regmap_write(tmp102->regmap, TMP102_CONF_REG, regval);
if (err < 0) {
dev_err(dev, "error writing config register\n");
return err;
}
/*
* Mark that we are not ready with data until the first
* conversion is complete
*/
tmp102->ready_time = jiffies + msecs_to_jiffies(CONVERSION_TIME_MS);
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
tmp102,
&tmp102_chip_info,
NULL);
if (IS_ERR(hwmon_dev)) {
dev_dbg(dev, "unable to register hwmon device\n");
return PTR_ERR(hwmon_dev);
}
dev_info(dev, "initialized\n");
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int tmp102_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct tmp102 *tmp102 = i2c_get_clientdata(client);
return regmap_update_bits(tmp102->regmap, TMP102_CONF_REG,
TMP102_CONF_SD, TMP102_CONF_SD);
}
static int tmp102_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct tmp102 *tmp102 = i2c_get_clientdata(client);
int err;
err = regmap_update_bits(tmp102->regmap, TMP102_CONF_REG,
TMP102_CONF_SD, 0);
tmp102->ready_time = jiffies + msecs_to_jiffies(CONVERSION_TIME_MS);
return err;
}
#endif /* CONFIG_PM */
static SIMPLE_DEV_PM_OPS(tmp102_dev_pm_ops, tmp102_suspend, tmp102_resume);
static const struct i2c_device_id tmp102_id[] = {
{ "tmp102", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tmp102_id);
static const struct of_device_id __maybe_unused tmp102_of_match[] = {
{ .compatible = "ti,tmp102" },
{ },
};
MODULE_DEVICE_TABLE(of, tmp102_of_match);
static struct i2c_driver tmp102_driver = {
.driver.name = DRIVER_NAME,
.driver.of_match_table = of_match_ptr(tmp102_of_match),
.driver.pm = &tmp102_dev_pm_ops,
.probe_new = tmp102_probe,
.id_table = tmp102_id,
};
module_i2c_driver(tmp102_driver);
MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver");
MODULE_LICENSE("GPL");