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Commit 98ab0b5d authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
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i2c: convert lm75 chip driver to use sysfs files.

parent 6fb80bd6
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Showing with 77 additions and 108 deletions
drivers/i2c/chips/lm75.c
View file @ 98ab0b5d
......@@ -18,6 +18,8 @@
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* #define DEBUG 1 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
......@@ -25,8 +27,6 @@
#include <linux/i2c-proc.h>
#define LM75_SYSCTL_TEMP 1200 /* Degrees Celsius * 10 */
/* Addresses to scan */
static unsigned short normal_i2c[] = { SENSORS_I2C_END };
static unsigned short normal_i2c_range[] = { 0x48, 0x4f, SENSORS_I2C_END };
......@@ -39,97 +39,113 @@ SENSORS_INSMOD_1(lm75);
/* Many LM75 constants specified below */
/* The LM75 registers */
#define LM75_REG_TEMP 0x00
#define LM75_REG_CONF 0x01
#define LM75_REG_TEMP_HYST 0x02
#define LM75_REG_TEMP_OS 0x03
#define LM75_REG_TEMP 0x00
#define LM75_REG_CONF 0x01
#define LM75_REG_TEMP_HYST 0x02
#define LM75_REG_TEMP_OS 0x03
/* Conversions. Rounding and limit checking is only done on the TO_REG
variants. Note that you should be a bit careful with which arguments
these macros are called: arguments may be evaluated more than once.
Fixing this is just not worth it. */
#define TEMP_FROM_REG(val) ((((val & 0x7fff) >> 7) * 5) | ((val & 0x8000)?-256:0))
#define TEMP_TO_REG(val) (SENSORS_LIMIT((val<0?(0x200+((val)/5))<<7:(((val) + 2) / 5) << 7),0,0xffff))
#define TEMP_FROM_REG(val) ((((val & 0x7fff) >> 7) * 5) | ((val & 0x8000)?-256:0))
#define TEMP_TO_REG(val) (SENSORS_LIMIT((val<0?(0x200+((val)/5))<<7:(((val) + 2) / 5) << 7),0,0xffff))
/* Initial values */
#define LM75_INIT_TEMP_OS 600
#define LM75_INIT_TEMP_HYST 500
#define LM75_INIT_TEMP_OS 600
#define LM75_INIT_TEMP_HYST 500
/* Each client has this additional data */
struct lm75_data {
int sysctl_id;
struct semaphore update_lock;
char valid; /* !=0 if following fields are valid */
unsigned long last_updated; /* In jiffies */
u16 temp, temp_os, temp_hyst; /* Register values */
struct semaphore update_lock;
char valid; /* !=0 if following fields are valid */
unsigned long last_updated; /* In jiffies */
u16 temp_input; /* Register values */
u16 temp_max;
u16 temp_hyst;
};
static int lm75_attach_adapter(struct i2c_adapter *adapter);
static int lm75_detect(struct i2c_adapter *adapter, int address,
unsigned short flags, int kind);
static int lm75_detect(struct i2c_adapter *adapter, int address, int kind);
static void lm75_init_client(struct i2c_client *client);
static int lm75_detach_client(struct i2c_client *client);
static u16 swap_bytes(u16 val);
static int lm75_read_value(struct i2c_client *client, u8 reg);
static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value);
static void lm75_temp(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void lm75_update_client(struct i2c_client *client);
/* This is the driver that will be inserted */
static struct i2c_driver lm75_driver = {
.owner = THIS_MODULE,
.name = "LM75 sensor",
.name = "lm75",
.id = I2C_DRIVERID_LM75,
.flags = I2C_DF_NOTIFY,
.attach_adapter = lm75_attach_adapter,
.detach_client = lm75_detach_client,
};
/* These files are created for each detected LM75. This is just a template;
though at first sight, you might think we could use a statically
allocated list, we need some way to get back to the parent - which
is done through one of the 'extra' fields which are initialized
when a new copy is allocated. */
static ctl_table lm75_dir_table_template[] = {
{LM75_SYSCTL_TEMP, "temp", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &lm75_temp},
{0}
};
static int lm75_id = 0;
#define show(value) \
static ssize_t show_##value(struct device *dev, char *buf) \
{ \
struct i2c_client *client = to_i2c_client(dev); \
struct lm75_data *data = i2c_get_clientdata(client); \
int temp; \
\
lm75_update_client(client); \
temp = TEMP_FROM_REG(data->value); \
return sprintf(buf, "%d\n", temp * 100); \
}
show(temp_max);
show(temp_hyst);
show(temp_input);
#define set(value, reg) \
static ssize_t set_##value(struct device *dev, const char *buf, size_t count) \
{ \
struct i2c_client *client = to_i2c_client(dev); \
struct lm75_data *data = i2c_get_clientdata(client); \
int temp = simple_strtoul(buf, NULL, 10) / 100; \
\
data->value = TEMP_TO_REG(temp); \
lm75_write_value(client, reg, data->value); \
return count; \
}
set(temp_max, LM75_REG_TEMP_OS);
set(temp_hyst, LM75_REG_TEMP_HYST);
static DEVICE_ATTR(temp_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
static DEVICE_ATTR(temp_min, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst);
static DEVICE_ATTR(temp_input, S_IRUGO, show_temp_input, NULL);
static int lm75_attach_adapter(struct i2c_adapter *adapter)
{
return i2c_detect(adapter, &addr_data, lm75_detect);
}
/* This function is called by i2c_detect */
static int lm75_detect(struct i2c_adapter *adapter, int address,
unsigned short flags, int kind)
static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
{
int i, cur, conf, hyst, os;
struct i2c_client *new_client;
struct lm75_data *data;
int err = 0;
const char *type_name, *client_name;
const char *name;
/* Make sure we aren't probing the ISA bus!! This is just a safety check
at this moment; i2c_detect really won't call us. */
#ifdef DEBUG
if (i2c_is_isa_adapter(adapter)) {
printk
("lm75.o: lm75_detect called for an ISA bus adapter?!?\n");
return 0;
dev_dbg(&adapter->dev,
"lm75_detect called for an ISA bus adapter?!?\n");
goto exit;
}
#endif
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA))
goto error0;
goto exit;
/* OK. For now, we presume we have a valid client. We now create the
client structure, even though we cannot fill it completely yet.
......@@ -138,7 +154,7 @@ static int lm75_detect(struct i2c_adapter *adapter, int address,
sizeof(struct lm75_data),
GFP_KERNEL))) {
err = -ENOMEM;
goto error0;
goto exit;
}
memset(new_client, 0x00, sizeof(struct i2c_client) +
sizeof(struct lm75_data));
......@@ -157,16 +173,10 @@ static int lm75_detect(struct i2c_adapter *adapter, int address,
hyst = i2c_smbus_read_word_data(new_client, 2);
os = i2c_smbus_read_word_data(new_client, 3);
for (i = 0; i <= 0x1f; i++)
if (
(i2c_smbus_read_byte_data
(new_client, i * 8 + 1) != conf)
||
(i2c_smbus_read_word_data
(new_client, i * 8 + 2) != hyst)
||
(i2c_smbus_read_word_data
(new_client, i * 8 + 3) != os))
goto error1;
if ((i2c_smbus_read_byte_data(new_client, i * 8 + 1) != conf) ||
(i2c_smbus_read_word_data(new_client, i * 8 + 2) != hyst) ||
(i2c_smbus_read_word_data(new_client, i * 8 + 3) != os))
goto exit_free;
}
/* Determine the chip type - only one kind supported! */
......@@ -174,15 +184,15 @@ static int lm75_detect(struct i2c_adapter *adapter, int address,
kind = lm75;
if (kind == lm75) {
type_name = "lm75";
client_name = "LM75 chip";
name = "lm75";
} else {
pr_debug("lm75.o: Internal error: unknown kind (%d)?!?", kind);
goto error1;
dev_dbg(&adapter->dev, "Internal error: unknown kind (%d)?!?",
kind);
goto exit_free;
}
/* Fill in the remaining client fields and put it into the global list */
strncpy(new_client->dev.name, client_name, DEVICE_NAME_SIZE);
strncpy(new_client->dev.name, name, DEVICE_NAME_SIZE);
new_client->id = lm75_id++;
data->valid = 0;
......@@ -190,36 +200,23 @@ static int lm75_detect(struct i2c_adapter *adapter, int address,
/* Tell the I2C layer a new client has arrived */
if ((err = i2c_attach_client(new_client)))
goto error3;
goto exit_free;
/* Register a new directory entry with module sensors */
i = i2c_register_entry(new_client, type_name, lm75_dir_table_template);
if (i < 0) {
err = i;
goto error4;
}
data->sysctl_id = i;
device_create_file(&new_client->dev, &dev_attr_temp_max);
device_create_file(&new_client->dev, &dev_attr_temp_min);
device_create_file(&new_client->dev, &dev_attr_temp_input);
lm75_init_client(new_client);
return 0;
/* OK, this is not exactly good programming practice, usually. But it is
very code-efficient in this case. */
error4:
i2c_detach_client(new_client);
error3:
error1:
exit_free:
kfree(new_client);
error0:
exit:
return err;
}
static int lm75_detach_client(struct i2c_client *client)
{
struct lm75_data *data = i2c_get_clientdata(client);
i2c_deregister_entry(data->sysctl_id);
i2c_detach_client(client);
kfree(client);
return 0;
......@@ -271,12 +268,11 @@ static void lm75_update_client(struct i2c_client *client)
if ((jiffies - data->last_updated > HZ + HZ / 2) ||
(jiffies < data->last_updated) || !data->valid) {
pr_debug("Starting lm75 update\n");
dev_dbg(&client->dev, "Starting lm75 update\n");
data->temp = lm75_read_value(client, LM75_REG_TEMP);
data->temp_os = lm75_read_value(client, LM75_REG_TEMP_OS);
data->temp_hyst =
lm75_read_value(client, LM75_REG_TEMP_HYST);
data->temp_input = lm75_read_value(client, LM75_REG_TEMP);
data->temp_max = lm75_read_value(client, LM75_REG_TEMP_OS);
data->temp_hyst = lm75_read_value(client, LM75_REG_TEMP_HYST);
data->last_updated = jiffies;
data->valid = 1;
}
......@@ -284,33 +280,6 @@ static void lm75_update_client(struct i2c_client *client)
up(&data->update_lock);
}
static void lm75_temp(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct lm75_data *data = i2c_get_clientdata(client);
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 1;
else if (operation == SENSORS_PROC_REAL_READ) {
lm75_update_client(client);
results[0] = TEMP_FROM_REG(data->temp_os);
results[1] = TEMP_FROM_REG(data->temp_hyst);
results[2] = TEMP_FROM_REG(data->temp);
*nrels_mag = 3;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
if (*nrels_mag >= 1) {
data->temp_os = TEMP_TO_REG(results[0]);
lm75_write_value(client, LM75_REG_TEMP_OS,
data->temp_os);
}
if (*nrels_mag >= 2) {
data->temp_hyst = TEMP_TO_REG(results[1]);
lm75_write_value(client, LM75_REG_TEMP_HYST,
data->temp_hyst);
}
}
}
static int __init sensors_lm75_init(void)
{
return i2c_add_driver(&lm75_driver);
......
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