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SubjectRe: [PATCH v4 2/4] pmbus: core: add helpers for byte write and read modify write
On 10/01/2014 12:05 PM, atull@opensource.altera.com wrote:
> 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.
>

Results in:

drivers/hwmon/pmbus/pmbus_core.c:259:5: warning: symbol 'pmbus_write_byte_data' was not declared. Should it be static?
drivers/hwmon/pmbus/pmbus_core.c:271:5: warning: symbol 'pmbus_update_byte_data' was not declared. Should it be static?
drivers/hwmon/pmbus/pmbus_core.c:259:5: warning: no previous prototype for 'pmbus_write_byte_data' [-Wmissing-prototypes]
drivers/hwmon/pmbus/pmbus_core.c:271:5: warning: no previous prototype for 'pmbus_update_byte_data' [-Wmissing-prototypes]

No need to resubmit. I added a patch to un-export the functions
and merged patch 2 and 3 together in order to avoid a warning
after patch 2. We can always export the new helper functions
later if needed.

Guenter



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