[PATCH v3 2/4] gpiolib: add gpio_request_{in,out}put support

[Antony Pavlov]

I just examined http://www.kernel.org/doc/Documentation/gpio.txt

I think, that I can drop my "homegrown" gpio_direction_{in,out}put functions
in favour of gpio_request_one() and int gpio_request_array() functions.

On 1 February 2013 22:26, Jean-Christophe PLAGNIOL-VILLARD
<plagnioj at jcrosoft.com> wrote:
> On 22:22 Fri 01 Feb     , Antony Pavlov wrote:
>> gpio_request() followed by gpio_direction_{in,out}put
>> is a gpio usage pattern (e.g. the similar functions
>> are used in a ARM boards code).
> NACK again
>
> NO PRINT ERROR in generic code
>
> this MUST be handled by the board code
>
> I DO wand duplicated code
>>
>> Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
>> ---
>>  drivers/gpio/gpio.c |   40 ++++++++++++++++++++++++++++++++++++++++
>>  include/gpio.h      |   13 +++++++++++++
>>  2 files changed, 53 insertions(+)
>>
>> diff --git a/drivers/gpio/gpio.c b/drivers/gpio/gpio.c
>> index d37f5a0..c0c66ae 100644
>> --- a/drivers/gpio/gpio.c
>> +++ b/drivers/gpio/gpio.c
>> @@ -47,6 +47,46 @@ int gpio_request(unsigned gpio, const char *label)
>>       return 0;
>>  }
>>
>> +int gpio_request_input(unsigned gpio, const char *label)
>> +{
>> +     int ret;
>> +
>> +     ret = gpio_request(gpio, label);
>> +     if (ret) {
>> +             pr_err("can't request gpio %d as %s (%d)\n",
>> +                     gpio, label, ret);
>> +             return ret;
>> +     }
>> +
>> +     ret = gpio_direction_input(gpio);
>> +     if (ret) {
>> +             pr_err("can't configure gpio %d (%s) as input (%d)\n",
>> +                     gpio, label, ret);
>> +     }
>> +
>> +     return ret;
>> +}
>> +
>> +int gpio_request_output(unsigned gpio, const char *label, int value)
>> +{
>> +     int ret;
>> +
>> +     ret = gpio_request(gpio, label);
>> +     if (ret) {
>> +             pr_err("can't request gpio %d as %s (%d)\n",
>> +                     gpio, label, ret);
>> +             return ret;
>> +     }
>> +
>> +     ret = gpio_direction_output(gpio, value);
>> +     if (ret) {
>> +             pr_err("can't configure gpio %d (%s) as output (%d)\n",
>> +                     gpio, label, ret);
>> +     }
>> +
>> +     return ret;
>> +}
>> +
>>  void gpio_free(unsigned gpio)
>>  {
>>       struct gpio_info *gi = &gpio_desc[gpio];
>> diff --git a/include/gpio.h b/include/gpio.h
>> index 794d959..309c1c5 100644
>> --- a/include/gpio.h
>> +++ b/include/gpio.h
>> @@ -9,11 +9,24 @@ static inline int gpio_request(unsigned gpio, const char *label)
>>       return 0;
>>  }
>>
>> +static inline int gpio_request_input(unsigned gpio, const char *label)
>> +{
>> +     return 0;
>> +}
>> +
>> +static inline int gpio_request_output(unsigned gpio, const char *label,
>> +             int value)
>> +{
>> +     return 0;
>> +}
>> +
>>  static inline void gpio_free(unsigned gpio)
>>  {
>>  }
>>  #else
>>  int gpio_request(unsigned gpio, const char *label);
>> +int gpio_request_input(unsigned gpio, const char *label);
>> +int gpio_request_output(unsigned gpio, const char *label, int value);
>>  void gpio_free(unsigned gpio);
>>  #endif
>>
>> --
>> 1.7.10.4
>>



-- 
Best regards,
  Antony Pavlov