mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 21:51:40 +00:00
6748703856
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>
315 lines
7.5 KiB
C
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, ®val);
|
|
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, ®val);
|
|
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");
|