Commit 46243f3a authored by Guenter Roeck's avatar Guenter Roeck
Browse files

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: default avatarGuenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: default avatarRobert Coulson <robert.coulson@ericsson.com>
parent 2bd05bf4

drivers/hwmon/pmbus/pmbus.h

+4 −0
Original line number Diff line number Diff line
@@ -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);

drivers/hwmon/pmbus/pmbus_core.c

+46 −6
Original line number Diff line number Diff line
@@ -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)

{
@@ -350,7 +389,8 @@ static struct pmbus_data *pmbus_update_device(struct device *dev) 


			if (!data->valid || sensor->update)

				sensor->data

				    = pmbus_read_word_data(client, sensor->page,

				    = _pmbus_read_word_data(client,

							    sensor->page,

							    sensor->reg);

		}

		pmbus_clear_faults(client);
@@ -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

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