Re: [PATCH v1 05/17] misc: ds1682: Change nvmem reg_read/write return type

[Joy Chakraborty <joychakr@google.com>]

On Thu, Jun 6, 2024 at 2:48 AM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On 6/5/24 10:59, Joy Chakraborty wrote:
> > Change nvmem read/write function definition return type to ssize_t.
> >
> > Signed-off-by: Joy Chakraborty <joychakr@google.com>
> > ---
> >   drivers/misc/ds1682.c | 16 ++++++----------
> >   1 file changed, 6 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/misc/ds1682.c b/drivers/misc/ds1682.c
> > index 5f8dcd0e3848..953341666ddb 100644
> > --- a/drivers/misc/ds1682.c
> > +++ b/drivers/misc/ds1682.c
> > @@ -198,26 +198,22 @@ static const struct bin_attribute ds1682_eeprom_attr = {
> >       .write = ds1682_eeprom_write,
> >   };
> >
> > -static int ds1682_nvmem_read(void *priv, unsigned int offset, void *val,
> > -                          size_t bytes)
> > +static ssize_t ds1682_nvmem_read(void *priv, unsigned int offset, void *val,
> > +                              size_t bytes)
> >   {
> >       struct i2c_client *client = priv;
> > -     int ret;
> >
> > -     ret = i2c_smbus_read_i2c_block_data(client, DS1682_REG_EEPROM + offset,
> > +     return i2c_smbus_read_i2c_block_data(client, DS1682_REG_EEPROM + offset,
> >                                           bytes, val);
> > -     return ret < 0 ? ret : 0;
> >   }
> >
> > -static int ds1682_nvmem_write(void *priv, unsigned int offset, void *val,
> > -                           size_t bytes)
> > +static ssize_t ds1682_nvmem_write(void *priv, unsigned int offset, void *val,
> > +                               size_t bytes)
> >   {
> >       struct i2c_client *client = priv;
> > -     int ret;
> >
> > -     ret = i2c_smbus_write_i2c_block_data(client, DS1682_REG_EEPROM + offset,
> > +     return i2c_smbus_write_i2c_block_data(client, DS1682_REG_EEPROM + offset,
> >                                            bytes, val);
>
> i2c_smbus_write_i2c_block_data() does not return the number of bytes written.
> It returns either 0 or an error code.
>
Ack, I see only i2c_smbus_read_i2c_block_data()  returns the number of
bytes read . Will fix it next revision.

> Guenter
>