c3813d6af1
Struct i2c_client_address_data only contains one field at this point, which makes its usefulness questionable. Get rid of it and pass simple address lists around instead. Signed-off-by: Jean Delvare <khali@linux-fr.org> Tested-by: Wolfram Sang <w.sang@pengutronix.de>
327 lines
8.5 KiB
C
327 lines
8.5 KiB
C
/*
|
|
* w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware
|
|
* monitoring
|
|
* Copyright (C) 2003-2009 Jean Delvare <khali@linux-fr.org>
|
|
*
|
|
* Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made
|
|
* by Winbond. It reports a single external temperature with a 1 deg
|
|
* resolution and a 3 deg accuracy. Datasheet can be obtained from
|
|
* Winbond's website at:
|
|
* http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf
|
|
*
|
|
* Ported to Linux 2.6 by Wolfgang Ziegler <nuppla@gmx.at> and Jean Delvare
|
|
* <khali@linux-fr.org>.
|
|
*
|
|
* Thanks to James Bolt <james@evilpenguin.com> for benchmarking the read
|
|
* error handling mechanism.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/hwmon-sysfs.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mutex.h>
|
|
|
|
/* How many retries on register read error */
|
|
#define MAX_RETRIES 5
|
|
|
|
/*
|
|
* Address to scan
|
|
* Address is fully defined internally and cannot be changed.
|
|
*/
|
|
|
|
static const unsigned short normal_i2c[] = { 0x2e, I2C_CLIENT_END };
|
|
|
|
/*
|
|
* Insmod parameters
|
|
*/
|
|
|
|
I2C_CLIENT_INSMOD_1(w83l785ts);
|
|
|
|
/*
|
|
* The W83L785TS-S registers
|
|
* Manufacturer ID is 0x5CA3 for Winbond.
|
|
*/
|
|
|
|
#define W83L785TS_REG_MAN_ID1 0x4D
|
|
#define W83L785TS_REG_MAN_ID2 0x4C
|
|
#define W83L785TS_REG_CHIP_ID 0x4E
|
|
#define W83L785TS_REG_CONFIG 0x40
|
|
#define W83L785TS_REG_TYPE 0x52
|
|
#define W83L785TS_REG_TEMP 0x27
|
|
#define W83L785TS_REG_TEMP_OVER 0x53 /* not sure about this one */
|
|
|
|
/*
|
|
* Conversions
|
|
* The W83L785TS-S uses signed 8-bit values.
|
|
*/
|
|
|
|
#define TEMP_FROM_REG(val) ((val) * 1000)
|
|
|
|
/*
|
|
* Functions declaration
|
|
*/
|
|
|
|
static int w83l785ts_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id);
|
|
static int w83l785ts_detect(struct i2c_client *client,
|
|
struct i2c_board_info *info);
|
|
static int w83l785ts_remove(struct i2c_client *client);
|
|
static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval);
|
|
static struct w83l785ts_data *w83l785ts_update_device(struct device *dev);
|
|
|
|
/*
|
|
* Driver data (common to all clients)
|
|
*/
|
|
|
|
static const struct i2c_device_id w83l785ts_id[] = {
|
|
{ "w83l785ts", w83l785ts },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, w83l785ts_id);
|
|
|
|
static struct i2c_driver w83l785ts_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "w83l785ts",
|
|
},
|
|
.probe = w83l785ts_probe,
|
|
.remove = w83l785ts_remove,
|
|
.id_table = w83l785ts_id,
|
|
.detect = w83l785ts_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
/*
|
|
* Client data (each client gets its own)
|
|
*/
|
|
|
|
struct w83l785ts_data {
|
|
struct device *hwmon_dev;
|
|
struct mutex update_lock;
|
|
char valid; /* zero until following fields are valid */
|
|
unsigned long last_updated; /* in jiffies */
|
|
|
|
/* registers values */
|
|
s8 temp[2]; /* 0: input
|
|
1: critical limit */
|
|
};
|
|
|
|
/*
|
|
* Sysfs stuff
|
|
*/
|
|
|
|
static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
struct w83l785ts_data *data = w83l785ts_update_device(dev);
|
|
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
|
|
}
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 1);
|
|
|
|
/*
|
|
* Real code
|
|
*/
|
|
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */
|
|
static int w83l785ts_detect(struct i2c_client *client,
|
|
struct i2c_board_info *info)
|
|
{
|
|
struct i2c_adapter *adapter = client->adapter;
|
|
u16 man_id;
|
|
u8 chip_id;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -ENODEV;
|
|
|
|
/* detection */
|
|
if ((w83l785ts_read_value(client, W83L785TS_REG_CONFIG, 0) & 0x80)
|
|
|| (w83l785ts_read_value(client, W83L785TS_REG_TYPE, 0) & 0xFC)) {
|
|
dev_dbg(&adapter->dev,
|
|
"W83L785TS-S detection failed at 0x%02x\n",
|
|
client->addr);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Identification */
|
|
man_id = (w83l785ts_read_value(client, W83L785TS_REG_MAN_ID1, 0) << 8)
|
|
+ w83l785ts_read_value(client, W83L785TS_REG_MAN_ID2, 0);
|
|
chip_id = w83l785ts_read_value(client, W83L785TS_REG_CHIP_ID, 0);
|
|
|
|
if (man_id != 0x5CA3 /* Winbond */
|
|
|| chip_id != 0x70) { /* W83L785TS-S */
|
|
dev_dbg(&adapter->dev,
|
|
"Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
|
|
man_id, chip_id);
|
|
return -ENODEV;
|
|
}
|
|
|
|
strlcpy(info->type, "w83l785ts", I2C_NAME_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int w83l785ts_probe(struct i2c_client *new_client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct w83l785ts_data *data;
|
|
int err = 0;
|
|
|
|
data = kzalloc(sizeof(struct w83l785ts_data), GFP_KERNEL);
|
|
if (!data) {
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
i2c_set_clientdata(new_client, data);
|
|
data->valid = 0;
|
|
mutex_init(&data->update_lock);
|
|
|
|
/* Default values in case the first read fails (unlikely). */
|
|
data->temp[1] = data->temp[0] = 0;
|
|
|
|
/*
|
|
* Initialize the W83L785TS chip
|
|
* Nothing yet, assume it is already started.
|
|
*/
|
|
|
|
err = device_create_file(&new_client->dev,
|
|
&sensor_dev_attr_temp1_input.dev_attr);
|
|
if (err)
|
|
goto exit_remove;
|
|
|
|
err = device_create_file(&new_client->dev,
|
|
&sensor_dev_attr_temp1_max.dev_attr);
|
|
if (err)
|
|
goto exit_remove;
|
|
|
|
/* Register sysfs hooks */
|
|
data->hwmon_dev = hwmon_device_register(&new_client->dev);
|
|
if (IS_ERR(data->hwmon_dev)) {
|
|
err = PTR_ERR(data->hwmon_dev);
|
|
goto exit_remove;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_remove:
|
|
device_remove_file(&new_client->dev,
|
|
&sensor_dev_attr_temp1_input.dev_attr);
|
|
device_remove_file(&new_client->dev,
|
|
&sensor_dev_attr_temp1_max.dev_attr);
|
|
kfree(data);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static int w83l785ts_remove(struct i2c_client *client)
|
|
{
|
|
struct w83l785ts_data *data = i2c_get_clientdata(client);
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
device_remove_file(&client->dev,
|
|
&sensor_dev_attr_temp1_input.dev_attr);
|
|
device_remove_file(&client->dev,
|
|
&sensor_dev_attr_temp1_max.dev_attr);
|
|
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
|
|
static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval)
|
|
{
|
|
int value, i;
|
|
struct device *dev;
|
|
const char *prefix;
|
|
|
|
/* We might be called during detection, at which point the client
|
|
isn't yet fully initialized, so we can't use dev_dbg on it */
|
|
if (i2c_get_clientdata(client)) {
|
|
dev = &client->dev;
|
|
prefix = "";
|
|
} else {
|
|
dev = &client->adapter->dev;
|
|
prefix = "w83l785ts: ";
|
|
}
|
|
|
|
/* Frequent read errors have been reported on Asus boards, so we
|
|
* retry on read errors. If it still fails (unlikely), return the
|
|
* default value requested by the caller. */
|
|
for (i = 1; i <= MAX_RETRIES; i++) {
|
|
value = i2c_smbus_read_byte_data(client, reg);
|
|
if (value >= 0) {
|
|
dev_dbg(dev, "%sRead 0x%02x from register 0x%02x.\n",
|
|
prefix, value, reg);
|
|
return value;
|
|
}
|
|
dev_dbg(dev, "%sRead failed, will retry in %d.\n", prefix, i);
|
|
msleep(i);
|
|
}
|
|
|
|
dev_err(dev, "%sCouldn't read value from register 0x%02x.\n", prefix,
|
|
reg);
|
|
return defval;
|
|
}
|
|
|
|
static struct w83l785ts_data *w83l785ts_update_device(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct w83l785ts_data *data = i2c_get_clientdata(client);
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (!data->valid || time_after(jiffies, data->last_updated + HZ * 2)) {
|
|
dev_dbg(&client->dev, "Updating w83l785ts data.\n");
|
|
data->temp[0] = w83l785ts_read_value(client,
|
|
W83L785TS_REG_TEMP, data->temp[0]);
|
|
data->temp[1] = w83l785ts_read_value(client,
|
|
W83L785TS_REG_TEMP_OVER, data->temp[1]);
|
|
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
static int __init sensors_w83l785ts_init(void)
|
|
{
|
|
return i2c_add_driver(&w83l785ts_driver);
|
|
}
|
|
|
|
static void __exit sensors_w83l785ts_exit(void)
|
|
{
|
|
i2c_del_driver(&w83l785ts_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
|
|
MODULE_DESCRIPTION("W83L785TS-S driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(sensors_w83l785ts_init);
|
|
module_exit(sensors_w83l785ts_exit);
|