mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
![Deepak Saxena](/assets/img/avatar_default.png)
Use kzalloc instead of kmalloc+memset in all hardware monitoring drivers. Signed-off-by: Deepak Saxena <dsaxena@plexity.net> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
335 lines
9 KiB
C
335 lines
9 KiB
C
/*
|
|
* w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware
|
|
* monitoring
|
|
* Copyright (C) 2003-2004 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>
|
|
|
|
/* How many retries on register read error */
|
|
#define MAX_RETRIES 5
|
|
|
|
/*
|
|
* Address to scan
|
|
* Address is fully defined internally and cannot be changed.
|
|
*/
|
|
|
|
static 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_attach_adapter(struct i2c_adapter *adapter);
|
|
static int w83l785ts_detect(struct i2c_adapter *adapter, int address,
|
|
int kind);
|
|
static int w83l785ts_detach_client(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 struct i2c_driver w83l785ts_driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "w83l785ts",
|
|
.id = I2C_DRIVERID_W83L785TS,
|
|
.flags = I2C_DF_NOTIFY,
|
|
.attach_adapter = w83l785ts_attach_adapter,
|
|
.detach_client = w83l785ts_detach_client,
|
|
};
|
|
|
|
/*
|
|
* Client data (each client gets its own)
|
|
*/
|
|
|
|
struct w83l785ts_data {
|
|
struct i2c_client client;
|
|
struct class_device *class_dev;
|
|
struct semaphore 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
|
|
*/
|
|
|
|
static int w83l785ts_attach_adapter(struct i2c_adapter *adapter)
|
|
{
|
|
if (!(adapter->class & I2C_CLASS_HWMON))
|
|
return 0;
|
|
return i2c_probe(adapter, &addr_data, w83l785ts_detect);
|
|
}
|
|
|
|
/*
|
|
* The following function does more than just detection. If detection
|
|
* succeeds, it also registers the new chip.
|
|
*/
|
|
static int w83l785ts_detect(struct i2c_adapter *adapter, int address, int kind)
|
|
{
|
|
struct i2c_client *new_client;
|
|
struct w83l785ts_data *data;
|
|
int err = 0;
|
|
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
goto exit;
|
|
|
|
if (!(data = kzalloc(sizeof(struct w83l785ts_data), GFP_KERNEL))) {
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
/* The common I2C client data is placed right before the
|
|
* W83L785TS-specific data. */
|
|
new_client = &data->client;
|
|
i2c_set_clientdata(new_client, data);
|
|
new_client->addr = address;
|
|
new_client->adapter = adapter;
|
|
new_client->driver = &w83l785ts_driver;
|
|
new_client->flags = 0;
|
|
|
|
/*
|
|
* Now we do the remaining detection. A negative kind means that
|
|
* the driver was loaded with no force parameter (default), so we
|
|
* must both detect and identify the chip (actually there is only
|
|
* one possible kind of chip for now, W83L785TS-S). A zero kind means
|
|
* that the driver was loaded with the force parameter, the detection
|
|
* step shall be skipped. A positive kind means that the driver
|
|
* was loaded with the force parameter and a given kind of chip is
|
|
* requested, so both the detection and the identification steps
|
|
* are skipped.
|
|
*/
|
|
if (kind < 0) { /* detection */
|
|
if (((w83l785ts_read_value(new_client,
|
|
W83L785TS_REG_CONFIG, 0) & 0x80) != 0x00)
|
|
|| ((w83l785ts_read_value(new_client,
|
|
W83L785TS_REG_TYPE, 0) & 0xFC) != 0x00)) {
|
|
dev_dbg(&adapter->dev,
|
|
"W83L785TS-S detection failed at 0x%02x.\n",
|
|
address);
|
|
goto exit_free;
|
|
}
|
|
}
|
|
|
|
if (kind <= 0) { /* identification */
|
|
u16 man_id;
|
|
u8 chip_id;
|
|
|
|
man_id = (w83l785ts_read_value(new_client,
|
|
W83L785TS_REG_MAN_ID1, 0) << 8) +
|
|
w83l785ts_read_value(new_client,
|
|
W83L785TS_REG_MAN_ID2, 0);
|
|
chip_id = w83l785ts_read_value(new_client,
|
|
W83L785TS_REG_CHIP_ID, 0);
|
|
|
|
if (man_id == 0x5CA3) { /* Winbond */
|
|
if (chip_id == 0x70) { /* W83L785TS-S */
|
|
kind = w83l785ts;
|
|
}
|
|
}
|
|
|
|
if (kind <= 0) { /* identification failed */
|
|
dev_info(&adapter->dev,
|
|
"Unsupported chip (man_id=0x%04X, "
|
|
"chip_id=0x%02X).\n", man_id, chip_id);
|
|
goto exit_free;
|
|
}
|
|
}
|
|
|
|
/* We can fill in the remaining client fields. */
|
|
strlcpy(new_client->name, "w83l785ts", I2C_NAME_SIZE);
|
|
data->valid = 0;
|
|
init_MUTEX(&data->update_lock);
|
|
|
|
/* Default values in case the first read fails (unlikely). */
|
|
data->temp[1] = data->temp[0] = 0;
|
|
|
|
/* Tell the I2C layer a new client has arrived. */
|
|
if ((err = i2c_attach_client(new_client)))
|
|
goto exit_free;
|
|
|
|
/*
|
|
* Initialize the W83L785TS chip
|
|
* Nothing yet, assume it is already started.
|
|
*/
|
|
|
|
/* Register sysfs hooks */
|
|
data->class_dev = hwmon_device_register(&new_client->dev);
|
|
if (IS_ERR(data->class_dev)) {
|
|
err = PTR_ERR(data->class_dev);
|
|
goto exit_detach;
|
|
}
|
|
|
|
device_create_file(&new_client->dev,
|
|
&sensor_dev_attr_temp1_input.dev_attr);
|
|
device_create_file(&new_client->dev,
|
|
&sensor_dev_attr_temp1_max.dev_attr);
|
|
|
|
return 0;
|
|
|
|
exit_detach:
|
|
i2c_detach_client(new_client);
|
|
exit_free:
|
|
kfree(data);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static int w83l785ts_detach_client(struct i2c_client *client)
|
|
{
|
|
struct w83l785ts_data *data = i2c_get_clientdata(client);
|
|
int err;
|
|
|
|
hwmon_device_unregister(data->class_dev);
|
|
|
|
if ((err = i2c_detach_client(client)))
|
|
return err;
|
|
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
|
|
static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval)
|
|
{
|
|
int value, i;
|
|
|
|
/* 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(&client->dev, "Read 0x%02x from register "
|
|
"0x%02x.\n", value, reg);
|
|
return value;
|
|
}
|
|
dev_dbg(&client->dev, "Read failed, will retry in %d.\n", i);
|
|
msleep(i);
|
|
}
|
|
|
|
dev_err(&client->dev, "Couldn't read value from register 0x%02x. "
|
|
"Please report.\n", 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);
|
|
|
|
down(&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;
|
|
}
|
|
|
|
up(&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);
|