mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Stephen Kitt](/assets/img/avatar_default.png)
This driver doesn't use the id information provided by the old i2c probe function, so it can trivially be converted to the simple ("probe_new") form. Signed-off-by: Stephen Kitt <steve@sk2.org> Link: https://lore.kernel.org/r/20200813162300.1514695-1-steve@sk2.org Signed-off-by: Guenter Roeck <linux@roeck-us.net>
290 lines
7.5 KiB
C
290 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* LM73 Sensor driver
|
|
* Based on LM75
|
|
*
|
|
* Copyright (C) 2007, CenoSYS (www.cenosys.com).
|
|
* Copyright (C) 2009, Bollore telecom (www.bolloretelecom.eu).
|
|
*
|
|
* Guillaume Ligneul <guillaume.ligneul@gmail.com>
|
|
* Adrien Demarez <adrien.demarez@bolloretelecom.eu>
|
|
* Jeremy Laine <jeremy.laine@bolloretelecom.eu>
|
|
* Chris Verges <kg4ysn@gmail.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/hwmon-sysfs.h>
|
|
#include <linux/err.h>
|
|
|
|
|
|
/* Addresses scanned */
|
|
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c,
|
|
0x4d, 0x4e, I2C_CLIENT_END };
|
|
|
|
/* LM73 registers */
|
|
#define LM73_REG_INPUT 0x00
|
|
#define LM73_REG_CONF 0x01
|
|
#define LM73_REG_MAX 0x02
|
|
#define LM73_REG_MIN 0x03
|
|
#define LM73_REG_CTRL 0x04
|
|
#define LM73_REG_ID 0x07
|
|
|
|
#define LM73_ID 0x9001 /* 0x0190, byte-swapped */
|
|
#define DRVNAME "lm73"
|
|
#define LM73_TEMP_MIN (-256000 / 250)
|
|
#define LM73_TEMP_MAX (255750 / 250)
|
|
|
|
#define LM73_CTRL_RES_SHIFT 5
|
|
#define LM73_CTRL_RES_MASK (BIT(5) | BIT(6))
|
|
#define LM73_CTRL_TO_MASK BIT(7)
|
|
|
|
#define LM73_CTRL_HI_SHIFT 2
|
|
#define LM73_CTRL_LO_SHIFT 1
|
|
|
|
static const unsigned short lm73_convrates[] = {
|
|
14, /* 11-bits (0.25000 C/LSB): RES1 Bit = 0, RES0 Bit = 0 */
|
|
28, /* 12-bits (0.12500 C/LSB): RES1 Bit = 0, RES0 Bit = 1 */
|
|
56, /* 13-bits (0.06250 C/LSB): RES1 Bit = 1, RES0 Bit = 0 */
|
|
112, /* 14-bits (0.03125 C/LSB): RES1 Bit = 1, RES0 Bit = 1 */
|
|
};
|
|
|
|
struct lm73_data {
|
|
struct i2c_client *client;
|
|
struct mutex lock;
|
|
u8 ctrl; /* control register value */
|
|
};
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
static ssize_t temp_store(struct device *dev, struct device_attribute *da,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
|
struct lm73_data *data = dev_get_drvdata(dev);
|
|
long temp;
|
|
short value;
|
|
s32 err;
|
|
|
|
int status = kstrtol(buf, 10, &temp);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
/* Write value */
|
|
value = clamp_val(temp / 250, LM73_TEMP_MIN, LM73_TEMP_MAX) << 5;
|
|
err = i2c_smbus_write_word_swapped(data->client, attr->index, value);
|
|
return (err < 0) ? err : count;
|
|
}
|
|
|
|
static ssize_t temp_show(struct device *dev, struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
|
struct lm73_data *data = dev_get_drvdata(dev);
|
|
int temp;
|
|
|
|
s32 err = i2c_smbus_read_word_swapped(data->client, attr->index);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* use integer division instead of equivalent right shift to
|
|
guarantee arithmetic shift and preserve the sign */
|
|
temp = (((s16) err) * 250) / 32;
|
|
return scnprintf(buf, PAGE_SIZE, "%d\n", temp);
|
|
}
|
|
|
|
static ssize_t convrate_store(struct device *dev, struct device_attribute *da,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct lm73_data *data = dev_get_drvdata(dev);
|
|
unsigned long convrate;
|
|
s32 err;
|
|
int res = 0;
|
|
|
|
err = kstrtoul(buf, 10, &convrate);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/*
|
|
* Convert the desired conversion rate into register bits.
|
|
* res is already initialized, and everything past the second-to-last
|
|
* value in the array is treated as belonging to the last value
|
|
* in the array.
|
|
*/
|
|
while (res < (ARRAY_SIZE(lm73_convrates) - 1) &&
|
|
convrate > lm73_convrates[res])
|
|
res++;
|
|
|
|
mutex_lock(&data->lock);
|
|
data->ctrl &= LM73_CTRL_TO_MASK;
|
|
data->ctrl |= res << LM73_CTRL_RES_SHIFT;
|
|
err = i2c_smbus_write_byte_data(data->client, LM73_REG_CTRL,
|
|
data->ctrl);
|
|
mutex_unlock(&data->lock);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t convrate_show(struct device *dev, struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
struct lm73_data *data = dev_get_drvdata(dev);
|
|
int res;
|
|
|
|
res = (data->ctrl & LM73_CTRL_RES_MASK) >> LM73_CTRL_RES_SHIFT;
|
|
return scnprintf(buf, PAGE_SIZE, "%hu\n", lm73_convrates[res]);
|
|
}
|
|
|
|
static ssize_t maxmin_alarm_show(struct device *dev,
|
|
struct device_attribute *da, char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
|
struct lm73_data *data = dev_get_drvdata(dev);
|
|
s32 ctrl;
|
|
|
|
mutex_lock(&data->lock);
|
|
ctrl = i2c_smbus_read_byte_data(data->client, LM73_REG_CTRL);
|
|
if (ctrl < 0)
|
|
goto abort;
|
|
data->ctrl = ctrl;
|
|
mutex_unlock(&data->lock);
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%d\n", (ctrl >> attr->index) & 1);
|
|
|
|
abort:
|
|
mutex_unlock(&data->lock);
|
|
return ctrl;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
/* sysfs attributes for hwmon */
|
|
|
|
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, LM73_REG_MAX);
|
|
static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, LM73_REG_MIN);
|
|
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, LM73_REG_INPUT);
|
|
static SENSOR_DEVICE_ATTR_RW(update_interval, convrate, 0);
|
|
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, maxmin_alarm,
|
|
LM73_CTRL_HI_SHIFT);
|
|
static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, maxmin_alarm,
|
|
LM73_CTRL_LO_SHIFT);
|
|
|
|
static struct attribute *lm73_attrs[] = {
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_min.dev_attr.attr,
|
|
&sensor_dev_attr_update_interval.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(lm73);
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
/* device probe and removal */
|
|
|
|
static int
|
|
lm73_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct device *hwmon_dev;
|
|
struct lm73_data *data;
|
|
int ctrl;
|
|
|
|
data = devm_kzalloc(dev, sizeof(struct lm73_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->client = client;
|
|
mutex_init(&data->lock);
|
|
|
|
ctrl = i2c_smbus_read_byte_data(client, LM73_REG_CTRL);
|
|
if (ctrl < 0)
|
|
return ctrl;
|
|
data->ctrl = ctrl;
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
|
|
data, lm73_groups);
|
|
if (IS_ERR(hwmon_dev))
|
|
return PTR_ERR(hwmon_dev);
|
|
|
|
dev_info(dev, "sensor '%s'\n", client->name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id lm73_ids[] = {
|
|
{ "lm73", 0 },
|
|
{ /* LIST END */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lm73_ids);
|
|
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */
|
|
static int lm73_detect(struct i2c_client *new_client,
|
|
struct i2c_board_info *info)
|
|
{
|
|
struct i2c_adapter *adapter = new_client->adapter;
|
|
int id, ctrl, conf;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
|
|
I2C_FUNC_SMBUS_WORD_DATA))
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* Do as much detection as possible with byte reads first, as word
|
|
* reads can confuse other devices.
|
|
*/
|
|
ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL);
|
|
if (ctrl < 0 || (ctrl & 0x10))
|
|
return -ENODEV;
|
|
|
|
conf = i2c_smbus_read_byte_data(new_client, LM73_REG_CONF);
|
|
if (conf < 0 || (conf & 0x0c))
|
|
return -ENODEV;
|
|
|
|
id = i2c_smbus_read_byte_data(new_client, LM73_REG_ID);
|
|
if (id < 0 || id != (LM73_ID & 0xff))
|
|
return -ENODEV;
|
|
|
|
/* Check device ID */
|
|
id = i2c_smbus_read_word_data(new_client, LM73_REG_ID);
|
|
if (id < 0 || id != LM73_ID)
|
|
return -ENODEV;
|
|
|
|
strlcpy(info->type, "lm73", I2C_NAME_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id lm73_of_match[] = {
|
|
{
|
|
.compatible = "ti,lm73",
|
|
},
|
|
{ },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, lm73_of_match);
|
|
|
|
static struct i2c_driver lm73_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "lm73",
|
|
.of_match_table = lm73_of_match,
|
|
},
|
|
.probe_new = lm73_probe,
|
|
.id_table = lm73_ids,
|
|
.detect = lm73_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
module_i2c_driver(lm73_driver);
|
|
|
|
MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>");
|
|
MODULE_DESCRIPTION("LM73 driver");
|
|
MODULE_LICENSE("GPL");
|