Commit 11c11998 authored by Alan Tull's avatar Alan Tull Committed by Guenter Roeck

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
......@@ -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);
......
......@@ -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.
......
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