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Commit 11c11998 authored by Alan Tull's avatar Alan Tull Committed by Guenter Roeck
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hwmon: (pmbus) add helpers for byte write and read modify write 



Add two helper functions:
 * pmbus_write_byte_data  = paged byte write
 * pmbus_update_byte_data = paged byte read/modify/write

Signed-off-by: default avatarAlan Tull <atull@opensource.altera.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 7e9d62d3

drivers/hwmon/pmbus/pmbus.h

+4 −0
Original line number Diff line number Diff line
@@ -375,6 +375,10 @@ 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, int page, u8 reg);

int pmbus_write_byte(struct i2c_client *client, int page, u8 value);

int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg,

			  u8 value);

int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,

			   u8 mask, u8 value);

void pmbus_clear_faults(struct i2c_client *client);

bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg);

bool pmbus_check_word_register(struct i2c_client *client, int page, int reg);

drivers/hwmon/pmbus/pmbus_core.c

+31 −0
Original line number Diff line number Diff line
@@ -253,6 +253,37 @@ int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg) 
}

EXPORT_SYMBOL_GPL(pmbus_read_byte_data);



int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg, u8 value)

{

	int rv;



	rv = pmbus_set_page(client, page);

	if (rv < 0)

		return rv;



	return i2c_smbus_write_byte_data(client, reg, value);

}

EXPORT_SYMBOL_GPL(pmbus_write_byte_data);



int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,

			   u8 mask, u8 value)

{

	unsigned int tmp;

	int rv;



	rv = pmbus_read_byte_data(client, page, reg);

	if (rv < 0)

		return rv;



	tmp = (rv & ~mask) | (value & mask);



	if (tmp != rv)

		rv = pmbus_write_byte_data(client, page, reg, tmp);



	return rv;

}

EXPORT_SYMBOL_GPL(pmbus_update_byte_data);



/*

 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if

 * a device specific mapping function exists and calls it if necessary.