[PATCH 1/2] gpiolib: add gpio_request and gpio_free support

[Jean-Christophe PLAGNIOL-VILLARD]

On 08:12 Fri 21 Dec     , Sascha Hauer wrote:
> On Thu, Dec 20, 2012 at 03:23:59PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > as today if no request or free provided do not complain
> > 
> > if the gpio is not request auto requested at first use
> > 
> > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
> > ---
> >  drivers/gpio/gpio.c |   87 ++++++++++++++++++++++++++++++++++++++++++++++-----
> >  include/gpio.h      |    7 +++++
> >  2 files changed, 87 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/gpio/gpio.c b/drivers/gpio/gpio.c
> > index 042a062..e29f0ba 100644
> > --- a/drivers/gpio/gpio.c
> > +++ b/drivers/gpio/gpio.c
> > @@ -1,19 +1,71 @@
> >  #include <common.h>
> >  #include <gpio.h>
> >  #include <errno.h>
> > +#include <malloc.h>
> >  
> >  static LIST_HEAD(chip_list);
> >  
> > -static struct gpio_chip *gpio_desc[ARCH_NR_GPIOS];
> > +struct gpio_info {
> > +	struct gpio_chip *chip;
> > +	bool requested;
> > +	char *label;
> > +};
> > +
> > +static struct gpio_info gpio_desc[ARCH_NR_GPIOS];
> > +
> > +int gpio_request(unsigned gpio, const char *label)
> > +{
> > +	struct gpio_info *gi = &gpio_desc[gpio];
> > +	struct gpio_chip *chip = gi->chip;
> > +	int ret;
> > +
> > +	if (!gpio_is_valid(gpio))
> > +		return -EINVAL;
> > +	if (!chip)
> > +		return -EINVAL;
> > +	if (gi->requested)
> > +		return -ENODEV;
> 
> -EBUSY?
> 
> >  void gpio_set_value(unsigned gpio, int value)
> >  {
> > -	struct gpio_chip *chip = gpio_desc[gpio];
> > +	struct gpio_info *gi = &gpio_desc[gpio];
> > +	struct gpio_chip *chip = gi->chip;
> >  
> >  	if (!gpio_is_valid(gpio))
> >  		return;
> >  	if (!chip)
> >  		return;
> > +	if (!gi->requested && gpio_request(gpio, "gpio"))
> > +		return;
> 
> Could you factor out this into a gpio_ensure_requested function? This
> way we would have a single point where the implicit gpio_request calls
> are handled.

ok

Best Regards,
J.