Commit 8a85007c authored by Adam Wujek's avatar Adam Wujek Committed by Guenter Roeck
Browse files

hwmon: (pmbus) add a function to check the presence of a block register 



Other functions (like pmbus_check_byte_register) cannot be used to check
the presence of a block register, because it will generate error when PEC
is used.

Signed-off-by: default avatarAdam Wujek <dev_public@wujek.eu>
Link: https://lore.kernel.org/r/20220601013232.801133-1-dev_public@wujek.eu


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent bae26b80

drivers/hwmon/pmbus/pmbus_core.c

+28 −0
Original line number Diff line number Diff line
@@ -441,6 +441,18 @@ int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg, 
}

EXPORT_SYMBOL_NS_GPL(pmbus_update_byte_data, PMBUS);



static int pmbus_read_block_data(struct i2c_client *client, int page, u8 reg,

				 char *data_buf)

{

	int rv;



	rv = pmbus_set_page(client, page, 0xff);

	if (rv < 0)

		return rv;



	return i2c_smbus_read_block_data(client, reg, data_buf);

}



static struct pmbus_sensor *pmbus_find_sensor(struct pmbus_data *data, int page,

					      int reg)

{
@@ -578,6 +590,22 @@ bool pmbus_check_word_register(struct i2c_client *client, int page, int reg) 
}

EXPORT_SYMBOL_NS_GPL(pmbus_check_word_register, PMBUS);



static bool pmbus_check_block_register(struct i2c_client *client, int page,

				       int reg)

{

	int rv;

	struct pmbus_data *data = i2c_get_clientdata(client);

	char data_buf[I2C_SMBUS_BLOCK_MAX + 2];



	rv = pmbus_read_block_data(client, page, reg, data_buf);

	if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))

		rv = pmbus_check_status_cml(client);

	if (rv < 0 && (data->flags & PMBUS_READ_STATUS_AFTER_FAILED_CHECK))

		data->read_status(client, -1);

	pmbus_clear_fault_page(client, -1);

	return rv >= 0;

}



const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)

{

	struct pmbus_data *data = i2c_get_clientdata(client);