diff options
| author |   Alan Tull <atull@opensource.altera.com> | 2014-10-15 13:55:08 -0500 |
|---|---|---|
| committer |   Guenter Roeck <linux@roeck-us.net> | 2014-11-30 20:13:13 -0800 |
| commit | 11c119986f2700e9daca0d795fbe84a988939655 (patch) | |
| tree | 42749a9012146e67645a597cbff2c2d6503e53a7 /drivers/hwmon/pmbus/pmbus_core.c | |
| parent | hwmon: (ltc2978) device tree bindings documentation (diff) | |
| download | linux-dev-11c119986f2700e9daca0d795fbe84a988939655.tar.xz linux-dev-11c119986f2700e9daca0d795fbe84a988939655.zip | |
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: Alan Tull <atull@opensource.altera.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to '')
| -rw-r--r-- | drivers/hwmon/pmbus/pmbus_core.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c index 291d11fe93e7..d6c3701eb7f9 100644 --- a/drivers/hwmon/pmbus/pmbus_core.c +++ b/drivers/hwmon/pmbus/pmbus_core.c @@ -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. |