![Andrew Morton](/assets/img/avatar_default.png)
Something horrid has happened to the indenting and braces in this function, producing a warning: drivers/hwmon/max1619.c: In function `max1619_detect': drivers/hwmon/max1619.c:196: warning: `man_id' might be used uninitialized in this function drivers/hwmon/max1619.c:196: warning: `chip_id' might be used uninitialized in this function Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
378 lines
11 KiB
C
378 lines
11 KiB
C
/*
|
|
* max1619.c - Part of lm_sensors, Linux kernel modules for hardware
|
|
* monitoring
|
|
* Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
|
|
* Jean Delvare <khali@linux-fr.org>
|
|
*
|
|
* Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
|
|
* It reports up to two temperatures (its own plus up to
|
|
* one external one). Complete datasheet can be
|
|
* obtained from Maxim's website at:
|
|
* http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
|
|
*
|
|
* 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/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/err.h>
|
|
|
|
static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
|
|
0x29, 0x2a, 0x2b,
|
|
0x4c, 0x4d, 0x4e,
|
|
I2C_CLIENT_END };
|
|
|
|
/*
|
|
* Insmod parameters
|
|
*/
|
|
|
|
I2C_CLIENT_INSMOD_1(max1619);
|
|
|
|
/*
|
|
* The MAX1619 registers
|
|
*/
|
|
|
|
#define MAX1619_REG_R_MAN_ID 0xFE
|
|
#define MAX1619_REG_R_CHIP_ID 0xFF
|
|
#define MAX1619_REG_R_CONFIG 0x03
|
|
#define MAX1619_REG_W_CONFIG 0x09
|
|
#define MAX1619_REG_R_CONVRATE 0x04
|
|
#define MAX1619_REG_W_CONVRATE 0x0A
|
|
#define MAX1619_REG_R_STATUS 0x02
|
|
#define MAX1619_REG_R_LOCAL_TEMP 0x00
|
|
#define MAX1619_REG_R_REMOTE_TEMP 0x01
|
|
#define MAX1619_REG_R_REMOTE_HIGH 0x07
|
|
#define MAX1619_REG_W_REMOTE_HIGH 0x0D
|
|
#define MAX1619_REG_R_REMOTE_LOW 0x08
|
|
#define MAX1619_REG_W_REMOTE_LOW 0x0E
|
|
#define MAX1619_REG_R_REMOTE_CRIT 0x10
|
|
#define MAX1619_REG_W_REMOTE_CRIT 0x12
|
|
#define MAX1619_REG_R_TCRIT_HYST 0x11
|
|
#define MAX1619_REG_W_TCRIT_HYST 0x13
|
|
|
|
/*
|
|
* Conversions and various macros
|
|
*/
|
|
|
|
#define TEMP_FROM_REG(val) ((val & 0x80 ? val-0x100 : val) * 1000)
|
|
#define TEMP_TO_REG(val) ((val < 0 ? val+0x100*1000 : val) / 1000)
|
|
|
|
/*
|
|
* Functions declaration
|
|
*/
|
|
|
|
static int max1619_attach_adapter(struct i2c_adapter *adapter);
|
|
static int max1619_detect(struct i2c_adapter *adapter, int address,
|
|
int kind);
|
|
static void max1619_init_client(struct i2c_client *client);
|
|
static int max1619_detach_client(struct i2c_client *client);
|
|
static struct max1619_data *max1619_update_device(struct device *dev);
|
|
|
|
/*
|
|
* Driver data (common to all clients)
|
|
*/
|
|
|
|
static struct i2c_driver max1619_driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "max1619",
|
|
.flags = I2C_DF_NOTIFY,
|
|
.attach_adapter = max1619_attach_adapter,
|
|
.detach_client = max1619_detach_client,
|
|
};
|
|
|
|
/*
|
|
* Client data (each client gets its own)
|
|
*/
|
|
|
|
struct max1619_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 */
|
|
u8 temp_input1; /* local */
|
|
u8 temp_input2, temp_low2, temp_high2; /* remote */
|
|
u8 temp_crit2;
|
|
u8 temp_hyst2;
|
|
u8 alarms;
|
|
};
|
|
|
|
/*
|
|
* Sysfs stuff
|
|
*/
|
|
|
|
#define show_temp(value) \
|
|
static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct max1619_data *data = max1619_update_device(dev); \
|
|
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
|
|
}
|
|
show_temp(temp_input1);
|
|
show_temp(temp_input2);
|
|
show_temp(temp_low2);
|
|
show_temp(temp_high2);
|
|
show_temp(temp_crit2);
|
|
show_temp(temp_hyst2);
|
|
|
|
#define set_temp2(value, reg) \
|
|
static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \
|
|
size_t count) \
|
|
{ \
|
|
struct i2c_client *client = to_i2c_client(dev); \
|
|
struct max1619_data *data = i2c_get_clientdata(client); \
|
|
long val = simple_strtol(buf, NULL, 10); \
|
|
\
|
|
down(&data->update_lock); \
|
|
data->value = TEMP_TO_REG(val); \
|
|
i2c_smbus_write_byte_data(client, reg, data->value); \
|
|
up(&data->update_lock); \
|
|
return count; \
|
|
}
|
|
|
|
set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
|
|
set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
|
|
set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
|
|
set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
|
|
|
|
static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct max1619_data *data = max1619_update_device(dev);
|
|
return sprintf(buf, "%d\n", data->alarms);
|
|
}
|
|
|
|
static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
|
|
static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
|
|
static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2,
|
|
set_temp_low2);
|
|
static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2,
|
|
set_temp_high2);
|
|
static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2,
|
|
set_temp_crit2);
|
|
static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2,
|
|
set_temp_hyst2);
|
|
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
|
|
|
|
/*
|
|
* Real code
|
|
*/
|
|
|
|
static int max1619_attach_adapter(struct i2c_adapter *adapter)
|
|
{
|
|
if (!(adapter->class & I2C_CLASS_HWMON))
|
|
return 0;
|
|
return i2c_probe(adapter, &addr_data, max1619_detect);
|
|
}
|
|
|
|
/*
|
|
* The following function does more than just detection. If detection
|
|
* succeeds, it also registers the new chip.
|
|
*/
|
|
static int max1619_detect(struct i2c_adapter *adapter, int address, int kind)
|
|
{
|
|
struct i2c_client *new_client;
|
|
struct max1619_data *data;
|
|
int err = 0;
|
|
const char *name = "";
|
|
u8 reg_config=0, reg_convrate=0, reg_status=0;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
goto exit;
|
|
|
|
if (!(data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL))) {
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
/* The common I2C client data is placed right before the
|
|
MAX1619-specific data. */
|
|
new_client = &data->client;
|
|
i2c_set_clientdata(new_client, data);
|
|
new_client->addr = address;
|
|
new_client->adapter = adapter;
|
|
new_client->driver = &max1619_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. 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 */
|
|
reg_config = i2c_smbus_read_byte_data(new_client,
|
|
MAX1619_REG_R_CONFIG);
|
|
reg_convrate = i2c_smbus_read_byte_data(new_client,
|
|
MAX1619_REG_R_CONVRATE);
|
|
reg_status = i2c_smbus_read_byte_data(new_client,
|
|
MAX1619_REG_R_STATUS);
|
|
if ((reg_config & 0x03) != 0x00
|
|
|| reg_convrate > 0x07 || (reg_status & 0x61 ) !=0x00) {
|
|
dev_dbg(&adapter->dev,
|
|
"MAX1619 detection failed at 0x%02x.\n",
|
|
address);
|
|
goto exit_free;
|
|
}
|
|
}
|
|
|
|
if (kind <= 0) { /* identification */
|
|
u8 man_id, chip_id;
|
|
|
|
man_id = i2c_smbus_read_byte_data(new_client,
|
|
MAX1619_REG_R_MAN_ID);
|
|
chip_id = i2c_smbus_read_byte_data(new_client,
|
|
MAX1619_REG_R_CHIP_ID);
|
|
|
|
if ((man_id == 0x4D) && (chip_id == 0x04))
|
|
kind = max1619;
|
|
|
|
if (kind <= 0) { /* identification failed */
|
|
dev_info(&adapter->dev,
|
|
"Unsupported chip (man_id=0x%02X, "
|
|
"chip_id=0x%02X).\n", man_id, chip_id);
|
|
goto exit_free;
|
|
}
|
|
}
|
|
|
|
if (kind == max1619)
|
|
name = "max1619";
|
|
|
|
/* We can fill in the remaining client fields */
|
|
strlcpy(new_client->name, name, I2C_NAME_SIZE);
|
|
data->valid = 0;
|
|
init_MUTEX(&data->update_lock);
|
|
|
|
/* Tell the I2C layer a new client has arrived */
|
|
if ((err = i2c_attach_client(new_client)))
|
|
goto exit_free;
|
|
|
|
/* Initialize the MAX1619 chip */
|
|
max1619_init_client(new_client);
|
|
|
|
/* 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, &dev_attr_temp1_input);
|
|
device_create_file(&new_client->dev, &dev_attr_temp2_input);
|
|
device_create_file(&new_client->dev, &dev_attr_temp2_min);
|
|
device_create_file(&new_client->dev, &dev_attr_temp2_max);
|
|
device_create_file(&new_client->dev, &dev_attr_temp2_crit);
|
|
device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst);
|
|
device_create_file(&new_client->dev, &dev_attr_alarms);
|
|
|
|
return 0;
|
|
|
|
exit_detach:
|
|
i2c_detach_client(new_client);
|
|
exit_free:
|
|
kfree(data);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static void max1619_init_client(struct i2c_client *client)
|
|
{
|
|
u8 config;
|
|
|
|
/*
|
|
* Start the conversions.
|
|
*/
|
|
i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
|
|
5); /* 2 Hz */
|
|
config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
|
|
if (config & 0x40)
|
|
i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
|
|
config & 0xBF); /* run */
|
|
}
|
|
|
|
static int max1619_detach_client(struct i2c_client *client)
|
|
{
|
|
struct max1619_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 struct max1619_data *max1619_update_device(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct max1619_data *data = i2c_get_clientdata(client);
|
|
|
|
down(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
|
|
dev_dbg(&client->dev, "Updating max1619 data.\n");
|
|
data->temp_input1 = i2c_smbus_read_byte_data(client,
|
|
MAX1619_REG_R_LOCAL_TEMP);
|
|
data->temp_input2 = i2c_smbus_read_byte_data(client,
|
|
MAX1619_REG_R_REMOTE_TEMP);
|
|
data->temp_high2 = i2c_smbus_read_byte_data(client,
|
|
MAX1619_REG_R_REMOTE_HIGH);
|
|
data->temp_low2 = i2c_smbus_read_byte_data(client,
|
|
MAX1619_REG_R_REMOTE_LOW);
|
|
data->temp_crit2 = i2c_smbus_read_byte_data(client,
|
|
MAX1619_REG_R_REMOTE_CRIT);
|
|
data->temp_hyst2 = i2c_smbus_read_byte_data(client,
|
|
MAX1619_REG_R_TCRIT_HYST);
|
|
data->alarms = i2c_smbus_read_byte_data(client,
|
|
MAX1619_REG_R_STATUS);
|
|
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
up(&data->update_lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
static int __init sensors_max1619_init(void)
|
|
{
|
|
return i2c_add_driver(&max1619_driver);
|
|
}
|
|
|
|
static void __exit sensors_max1619_exit(void)
|
|
{
|
|
i2c_del_driver(&max1619_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
|
|
"Jean Delvare <khali@linux-fr.org>");
|
|
MODULE_DESCRIPTION("MAX1619 sensor driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(sensors_max1619_init);
|
|
module_exit(sensors_max1619_exit);
|