Commit 7cbfaf48 authored by Jean Delvare's avatar Jean Delvare Committed by Greg Kroah-Hartman

[PATCH] I2C: Add lm83 chip driver

parent d0a2fba8
......@@ -68,6 +68,17 @@ config SENSORS_LM78
This driver can also be built as a module. If so, the module
will be called lm78.
config SENSORS_LM83
tristate "National Semiconductor LM83"
depends on I2C && EXPERIMENTAL
select I2C_SENSOR
help
If you say yes here you get support for National Semiconductor
LM83 sensor chips.
This driver can also be built as a module. If so, the module
will be called lm83.
config SENSORS_LM85
tristate "National Semiconductors LM85 and compatibles"
depends on I2C && EXPERIMENTAL
......
......@@ -10,5 +10,6 @@ obj-$(CONFIG_SENSORS_EEPROM) += eeprom.o
obj-$(CONFIG_SENSORS_IT87) += it87.o
obj-$(CONFIG_SENSORS_LM75) += lm75.o
obj-$(CONFIG_SENSORS_LM78) += lm78.o
obj-$(CONFIG_SENSORS_LM83) += lm83.o
obj-$(CONFIG_SENSORS_LM85) += lm85.o
obj-$(CONFIG_SENSORS_VIA686A) += via686a.o
/*
* lm83.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* Copyright (C) 2003 Jean Delvare <khali@linux-fr.org>
*
* Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
* a sensor chip made by National Semiconductor. It reports up to four
* temperatures (its own plus up to three external ones) with a 1 deg
* resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
* from National's website at:
* http://www.national.com/pf/LM/LM83.html
* Since the datasheet omits to give the chip stepping code, I give it
* here: 0x03 (at register 0xff).
*
* 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/i2c.h>
#include <linux/i2c-sensor.h>
/*
* Addresses to scan
* Address is selected using 2 three-level pins, resulting in 9 possible
* addresses.
*/
static unsigned short normal_i2c[] = { I2C_CLIENT_END };
static unsigned short normal_i2c_range[] = { 0x18, 0x1a, 0x29, 0x2b,
0x4c, 0x4e, I2C_CLIENT_END };
static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
static unsigned int normal_isa_range[] = { I2C_CLIENT_ISA_END };
/*
* Insmod parameters
*/
SENSORS_INSMOD_1(lm83);
/*
* The LM83 registers
* Manufacturer ID is 0x01 for National Semiconductor.
*/
#define LM83_REG_R_MAN_ID 0xFE
#define LM83_REG_R_CHIP_ID 0xFF
#define LM83_REG_R_CONFIG 0x03
#define LM83_REG_W_CONFIG 0x09
#define LM83_REG_R_STATUS1 0x02
#define LM83_REG_R_STATUS2 0x35
#define LM83_REG_R_LOCAL_TEMP 0x00
#define LM83_REG_R_LOCAL_HIGH 0x05
#define LM83_REG_W_LOCAL_HIGH 0x0B
#define LM83_REG_R_REMOTE1_TEMP 0x30
#define LM83_REG_R_REMOTE1_HIGH 0x38
#define LM83_REG_W_REMOTE1_HIGH 0x50
#define LM83_REG_R_REMOTE2_TEMP 0x01
#define LM83_REG_R_REMOTE2_HIGH 0x07
#define LM83_REG_W_REMOTE2_HIGH 0x0D
#define LM83_REG_R_REMOTE3_TEMP 0x31
#define LM83_REG_R_REMOTE3_HIGH 0x3A
#define LM83_REG_W_REMOTE3_HIGH 0x52
#define LM83_REG_R_TCRIT 0x42
#define LM83_REG_W_TCRIT 0x5A
/*
* Conversions, initial values and various macros
* The LM83 uses signed 8-bit values.
*/
#define TEMP_FROM_REG(val) ((val > 127 ? val-256 : val) * 1000)
#define TEMP_TO_REG(val) ((val < 0 ? val+256 : val) / 1000)
#define LM83_INIT_HIGH 100
#define LM83_INIT_CRIT 120
static const u8 LM83_REG_R_TEMP[] = {
LM83_REG_R_LOCAL_TEMP,
LM83_REG_R_REMOTE1_TEMP,
LM83_REG_R_REMOTE2_TEMP,
LM83_REG_R_REMOTE3_TEMP
};
static const u8 LM83_REG_R_HIGH[] = {
LM83_REG_R_LOCAL_HIGH,
LM83_REG_R_REMOTE1_HIGH,
LM83_REG_R_REMOTE2_HIGH,
LM83_REG_R_REMOTE3_HIGH
};
static const u8 LM83_REG_W_HIGH[] = {
LM83_REG_W_LOCAL_HIGH,
LM83_REG_W_REMOTE1_HIGH,
LM83_REG_W_REMOTE2_HIGH,
LM83_REG_W_REMOTE3_HIGH
};
/*
* Functions declaration
*/
static int lm83_attach_adapter(struct i2c_adapter *adapter);
static int lm83_detect(struct i2c_adapter *adapter, int address,
int kind);
static void lm83_init_client(struct i2c_client *client);
static int lm83_detach_client(struct i2c_client *client);
static void lm83_update_client(struct i2c_client *client);
/*
* Driver data (common to all clients)
*/
static struct i2c_driver lm83_driver = {
.owner = THIS_MODULE,
.name = "lm83",
.id = I2C_DRIVERID_LM83,
.flags = I2C_DF_NOTIFY,
.attach_adapter = lm83_attach_adapter,
.detach_client = lm83_detach_client,
};
/*
* Client data (each client gets its own)
*/
struct lm83_data
{
struct semaphore update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
/* registers values */
u8 temp_input[4];
u8 temp_high[4];
u8 temp_crit;
u16 alarms; /* bitvector, combined */
};
/*
* Internal variables
*/
static int lm83_id = 0;
/*
* Sysfs stuff
*/
#define show_temp(suffix, value) \
static ssize_t show_temp_##suffix(struct device *dev, char *buf) \
{ \
struct i2c_client *client = to_i2c_client(dev); \
struct lm83_data *data = i2c_get_clientdata(client); \
lm83_update_client(client); \
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
}
show_temp(input1, temp_input[0]);
show_temp(input2, temp_input[1]);
show_temp(input3, temp_input[2]);
show_temp(input4, temp_input[3]);
show_temp(high1, temp_high[0]);
show_temp(high2, temp_high[1]);
show_temp(high3, temp_high[2]);
show_temp(high4, temp_high[3]);
show_temp(crit, temp_crit);
#define set_temp(suffix, value, reg) \
static ssize_t set_temp_##suffix(struct device *dev, const char *buf, \
size_t count) \
{ \
struct i2c_client *client = to_i2c_client(dev); \
struct lm83_data *data = i2c_get_clientdata(client); \
data->value = TEMP_TO_REG(simple_strtoul(buf, NULL, 10)); \
i2c_smbus_write_byte_data(client, reg, data->value); \
return count; \
}
set_temp(high1, temp_high[0], LM83_REG_W_LOCAL_HIGH);
set_temp(high2, temp_high[1], LM83_REG_W_REMOTE1_HIGH);
set_temp(high3, temp_high[2], LM83_REG_W_REMOTE2_HIGH);
set_temp(high4, temp_high[3], LM83_REG_W_REMOTE3_HIGH);
set_temp(crit, temp_crit, LM83_REG_W_TCRIT);
static ssize_t show_alarms(struct device *dev, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm83_data *data = i2c_get_clientdata(client);
lm83_update_client(client);
return sprintf(buf, "%d\n", data->alarms);
}
static DEVICE_ATTR(temp_input1, S_IRUGO, show_temp_input1, NULL);
static DEVICE_ATTR(temp_input2, S_IRUGO, show_temp_input2, NULL);
static DEVICE_ATTR(temp_input3, S_IRUGO, show_temp_input3, NULL);
static DEVICE_ATTR(temp_input4, S_IRUGO, show_temp_input4, NULL);
static DEVICE_ATTR(temp_max1, S_IWUSR | S_IRUGO, show_temp_high1,
set_temp_high1);
static DEVICE_ATTR(temp_max2, S_IWUSR | S_IRUGO, show_temp_high2,
set_temp_high2);
static DEVICE_ATTR(temp_max3, S_IWUSR | S_IRUGO, show_temp_high3,
set_temp_high3);
static DEVICE_ATTR(temp_max4, S_IWUSR | S_IRUGO, show_temp_high4,
set_temp_high4);
static DEVICE_ATTR(temp_crit, S_IWUSR | S_IRUGO, show_temp_crit,
set_temp_crit);
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
/*
* Real code
*/
static int lm83_attach_adapter(struct i2c_adapter *adapter)
{
if (!(adapter->class & I2C_ADAP_CLASS_SMBUS))
return 0;
return i2c_detect(adapter, &addr_data, lm83_detect);
}
/*
* The following function does more than just detection. If detection
* succeeds, it also registers the new chip.
*/
static int lm83_detect(struct i2c_adapter *adapter, int address,
int kind)
{
struct i2c_client *new_client;
struct lm83_data *data;
int err = 0;
const char *name = "";
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
goto exit;
if (!(new_client = kmalloc(sizeof(struct i2c_client) +
sizeof(struct lm83_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
memset(new_client, 0x00, sizeof(struct i2c_client) +
sizeof(struct lm83_data));
/* The LM83-specific data is placed right after the common I2C
* client data. */
data = (struct lm83_data *) (new_client + 1);
i2c_set_clientdata(new_client, data);
new_client->addr = address;
new_client->adapter = adapter;
new_client->driver = &lm83_driver;
new_client->flags = 0;
/* Now we do the detection and identification. 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, LM83).
* 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 (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1)
& 0xA8) != 0x00) ||
((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2)
& 0x48) != 0x00) ||
((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG)
& 0x41) != 0x00)) {
dev_dbg(&client->dev,
"LM83 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,
LM83_REG_R_MAN_ID);
chip_id = i2c_smbus_read_byte_data(new_client,
LM83_REG_R_CHIP_ID);
if (man_id == 0x01) { /* National Semiconductor */
if (chip_id == 0x03) {
kind = lm83;
name = "lm83";
}
}
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;
}
}
/* We can fill in the remaining client fields */
strlcpy(new_client->name, name, I2C_NAME_SIZE);
new_client->id = lm83_id++;
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 LM83 chip */
lm83_init_client(new_client);
/* Register sysfs hooks */
device_create_file(&new_client->dev, &dev_attr_temp_input1);
device_create_file(&new_client->dev, &dev_attr_temp_input2);
device_create_file(&new_client->dev, &dev_attr_temp_input3);
device_create_file(&new_client->dev, &dev_attr_temp_input4);
device_create_file(&new_client->dev, &dev_attr_temp_max1);
device_create_file(&new_client->dev, &dev_attr_temp_max2);
device_create_file(&new_client->dev, &dev_attr_temp_max3);
device_create_file(&new_client->dev, &dev_attr_temp_max4);
device_create_file(&new_client->dev, &dev_attr_temp_crit);
device_create_file(&new_client->dev, &dev_attr_alarms);
return 0;
exit_free:
kfree(new_client);
exit:
return err;
}
static void lm83_init_client(struct i2c_client *client)
{
int nr;
for (nr = 0; nr < 4; nr++)
i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr],
TEMP_TO_REG(LM83_INIT_HIGH));
i2c_smbus_write_byte_data(client, LM83_REG_W_TCRIT,
TEMP_TO_REG(LM83_INIT_CRIT));
}
static int lm83_detach_client(struct i2c_client *client)
{
int err;
if ((err = i2c_detach_client(client))) {
dev_err(&client->dev,
"Client deregistration failed, client not detached.\n");
return err;
}
kfree(client);
return 0;
}
static void lm83_update_client(struct i2c_client *client)
{
struct lm83_data *data = i2c_get_clientdata(client);
down(&data->update_lock);
if ((jiffies - data->last_updated > HZ * 2) ||
(jiffies < data->last_updated) ||
!data->valid) {
int nr;
dev_dbg(&client->dev, "Updating lm83 data.\n");
for (nr = 0; nr < 4 ; nr++) {
data->temp_input[nr] =
i2c_smbus_read_byte_data(client,
LM83_REG_R_TEMP[nr]);
data->temp_high[nr] =
i2c_smbus_read_byte_data(client,
LM83_REG_R_HIGH[nr]);
}
data->temp_crit =
i2c_smbus_read_byte_data(client, LM83_REG_R_TCRIT);
data->alarms =
i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
<< 8);
data->last_updated = jiffies;
data->valid = 1;
}
up(&data->update_lock);
}
static int __init sensors_lm83_init(void)
{
return i2c_add_driver(&lm83_driver);
}
static void __exit sensors_lm83_exit(void)
{
i2c_del_driver(&lm83_driver);
}
MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("LM83 driver");
MODULE_LICENSE("GPL");
module_init(sensors_lm83_init);
module_exit(sensors_lm83_exit);
......@@ -153,6 +153,7 @@
#define I2C_DRIVERID_FS451 1037
#define I2C_DRIVERID_W83627HF 1038
#define I2C_DRIVERID_LM85 1039
#define I2C_DRIVERID_LM83 1040
/*
* ---- Adapter types ----------------------------------------------------
......
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