Messages in this thread Patch in this message | | | From | <> | Subject | [PATCH v4 2/4] pmbus: core: add helpers for byte write and read modify write | Date | Wed, 1 Oct 2014 14:05:48 -0500 |
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From: Alan Tull <atull@opensource.altera.com>
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> --- drivers/hwmon/pmbus/pmbus_core.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c index 291d11f..d6c3701 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. -- 1.7.9.5
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