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hwmon: (pmbus) Support reading and writing of word registers in device specific code 

Some PMBus devices use non-standard registers for some of the sensors and/or
limits. To support such devices, add code to support reading and writing of word
size registers in device specific code.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
This commit is contained in:
Guenter Roeck 2011-07-08 10:41:24 -07:00
parent 2bd05bf4d2
commit 46243f3ab4
2 changed files with 50 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/hwmon/pmbus/pmbus.h
View File

@ -286,6 +286,9 @@ struct pmbus_driver_info {
* necessary.
*/
int (*read_byte_data)(struct i2c_client *client, int page, int reg);
int (*read_word_data)(struct i2c_client *client, int page, int reg);
int (*write_word_data)(struct i2c_client *client, int page, int reg,
u16 word);
/*
* The identify function determines supported PMBus functionality.
* This function is only necessary if a chip driver supports multiple
@ -299,6 +302,7 @@ struct pmbus_driver_info {
int pmbus_set_page(struct i2c_client *client, u8 page);
int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg);
int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word);
int pmbus_read_byte_data(struct i2c_client *client, u8 page, u8 reg);
void pmbus_clear_faults(struct i2c_client *client);
bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg);

52
drivers/hwmon/pmbus/pmbus_core.c
View File

@ -175,8 +175,7 @@ static int pmbus_write_byte(struct i2c_client *client, u8 page, u8 value)
return i2c_smbus_write_byte(client, value);
}
static int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg,
u16 word)
int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word)
{
int rv;
@ -186,6 +185,28 @@ static int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg,
return i2c_smbus_write_word_data(client, reg, word);
}
EXPORT_SYMBOL_GPL(pmbus_write_word_data);
/*
* _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
* a device specific mapping function exists and calls it if necessary.
*/
static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
struct pmbus_data *data = i2c_get_clientdata(client);
const struct pmbus_driver_info *info = data->info;
int status;
if (info->write_word_data) {
status = info->write_word_data(client, page, reg, word);
if (status != -ENODATA)
return status;
}
if (reg >= PMBUS_VIRT_BASE)
return -EINVAL;
return pmbus_write_word_data(client, page, reg, word);
}
int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
{
@ -199,6 +220,24 @@ int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
}
EXPORT_SYMBOL_GPL(pmbus_read_word_data);
/*
* _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
* a device specific mapping function exists and calls it if necessary.
*/
static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg)
{
struct pmbus_data *data = i2c_get_clientdata(client);
const struct pmbus_driver_info *info = data->info;
int status;
if (info->read_word_data) {
status = info->read_word_data(client, page, reg);
if (status != -ENODATA)
return status;
}
return pmbus_read_word_data(client, page, reg);
}
int pmbus_read_byte_data(struct i2c_client *client, u8 page, u8 reg)
{
int rv;
@ -275,7 +314,7 @@ EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
/*
* _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
* a device specific mapping funcion exists and calls it if necessary.
* a device specific mapping function exists and calls it if necessary.
*/
static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
{
@ -350,8 +389,9 @@ static struct pmbus_data *pmbus_update_device(struct device *dev)
if (!data->valid || sensor->update)
sensor->data
= pmbus_read_word_data(client, sensor->page,
sensor->reg);
= _pmbus_read_word_data(client,
sensor->page,
sensor->reg);
}
pmbus_clear_faults(client);
data->last_updated = jiffies;
@ -722,7 +762,7 @@ static ssize_t pmbus_set_sensor(struct device *dev,
mutex_lock(&data->update_lock);
regval = pmbus_data2reg(data, sensor->class, val);
ret = pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
if (ret < 0)
rv = ret;
else