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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: Alan Tull <atull@opensource.altera.com> Cc: Mark Brown <broonie@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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2 changed files with 35 additions and 0 deletions
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@ -375,6 +375,10 @@ int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg);
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int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word);
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int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg);
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int pmbus_write_byte(struct i2c_client *client, int page, u8 value);
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int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg,
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u8 value);
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int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
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u8 mask, u8 value);
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void pmbus_clear_faults(struct i2c_client *client);
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bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg);
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bool pmbus_check_word_register(struct i2c_client *client, int page, int reg);
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@ -253,6 +253,37 @@ int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
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}
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EXPORT_SYMBOL_GPL(pmbus_read_byte_data);
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int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg, u8 value)
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{
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int rv;
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rv = pmbus_set_page(client, page);
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if (rv < 0)
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return rv;
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return i2c_smbus_write_byte_data(client, reg, value);
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}
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EXPORT_SYMBOL_GPL(pmbus_write_byte_data);
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int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
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u8 mask, u8 value)
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{
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unsigned int tmp;
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int rv;
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rv = pmbus_read_byte_data(client, page, reg);
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if (rv < 0)
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return rv;
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tmp = (rv & ~mask) | (value & mask);
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if (tmp != rv)
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rv = pmbus_write_byte_data(client, page, reg, tmp);
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return rv;
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}
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EXPORT_SYMBOL_GPL(pmbus_update_byte_data);
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/*
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* _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
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* a device specific mapping function exists and calls it if necessary.
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