On Wed, 11 Oct 2017, Meghana Madhyastha <meghana.madhyastha@xxxxxxxxx> wrote:
> On Wed, Oct 11, 2017 at 04:56:25PM +0300, Jani Nikula wrote:
>> On Wed, 11 Oct 2017, Meghana Madhyastha <meghana.madhyastha@xxxxxxxxx> wrote:
>> > Add devm_backlight_get and the corresponding release
>> > function because some drivers use devres versions of functions
>> > for requiring device resources.
>> >
>> > Signed-off-by: Meghana Madhyastha <meghana.madhyastha@xxxxxxxxx>
>> > ---
>> > Changes in v8:
>> > -Put the devres version to backlight.c along with backlight_get.
>> >
>> > drivers/gpu/drm/tinydrm/mi0283qt.c | 2 +-
>> > drivers/video/backlight/backlight.c | 31 +++++++++++++++++++++++++++++++
>> > include/linux/backlight.h | 16 ++++++++++++++++
>> > 3 files changed, 48 insertions(+), 1 deletion(-)
>> >
>> > diff --git a/drivers/gpu/drm/tinydrm/mi0283qt.c b/drivers/gpu/drm/tinydrm/mi0283qt.c
>> > index edf9502..03fec36 100644
>> > --- a/drivers/gpu/drm/tinydrm/mi0283qt.c
>> > +++ b/drivers/gpu/drm/tinydrm/mi0283qt.c
>> > @@ -190,7 +190,7 @@ static int mi0283qt_probe(struct spi_device *spi)
>> > if (IS_ERR(mipi->regulator))
>> > return PTR_ERR(mipi->regulator);
>> >
>> > - mipi->backlight = backlight_get(dev);
>> > + mipi->backlight = devm_backlight_get(dev);
>> > if (IS_ERR(mipi->backlight))
>> > return PTR_ERR(mipi->backlight);
>> >
>> > diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
>> > index 1debb60..9b24dc2 100644
>> > --- a/drivers/video/backlight/backlight.c
>> > +++ b/drivers/video/backlight/backlight.c
>> > @@ -618,6 +618,37 @@ struct backlight_device *backlight_get(struct device *dev)
>> > return bd;
>> > }
>> > EXPORT_SYMBOL(backlight_get);
>> > +
>> > +static void devm_backlight_get_release(void *data)
>>
>> I think that's a confusing name because of the "get", maybe just call it
>> devm_backlight_put?
>
> backlight_put is already in use as a helper function so wouldn't
> devm_backlight_put be confusing as there is already a backlight_put?
I'd think not, as it literally is a devm version of the same thing.
BR,
Jani.
>
> Regards,
> Meghana
>
>> BR,
>> Jani.
>>
>>
>>
>> > +{
>> > + backlight_put(data);
>> > +}
>> > +
>> > +/**
>> > + * devm_backlight_get - Resource-managed backlight_get()
>> > + * @dev: Device
>> > + *
>> > + * Device managed version of backlight_get(). The reference on the backlight
>> > + * device is automatically dropped on driver detach.
>> > + */
>> > +struct backlight_device *devm_backlight_get(struct device *dev)
>> > +{
>> > + struct backlight_device *bd;
>> > + int ret;
>> > +
>> > + bd = backlight_get(dev);
>> > + if (!bd)
>> > + return NULL;
>> > +
>> > + ret = devm_add_action(dev, devm_backlight_get_release, bd);
>> > + if (ret) {
>> > + backlight_put(bd);
>> > + return ERR_PTR(ret);
>> > + }
>> > +
>> > + return bd;
>> > +}
>> > +EXPORT_SYMBOL(devm_backlight_get);
>> > #endif
>> >
>> > static void __exit backlight_class_exit(void)
>> > diff --git a/include/linux/backlight.h b/include/linux/backlight.h
>> > index 1d713b3..0bfadb6 100644
>> > --- a/include/linux/backlight.h
>> > +++ b/include/linux/backlight.h
>> > @@ -183,6 +183,16 @@ static inline int backlight_disable(struct backlight_device *bd)
>> > return backlight_update_status(bd);
>> > }
>> >
>> > +/**
>> > + ** backlight_put - Drop backlight reference
>> > + ** @bd: the backlight device to put
>> > + **/
>> > +static inline void backlight_put(struct backlight_device *bd)
>> > +{
>> > + if (bd)
>> > + put_device(&bd->dev);
>> > +}
>> > +
>> > struct generic_bl_info {
>> > const char *name;
>> > int max_intensity;
>> > @@ -204,11 +214,17 @@ of_find_backlight_by_node(struct device_node *node)
>> >
>> > #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
>> > struct backlight_device *backlight_get(struct device *dev);
>> > +struct backlight_device *devm_backlight_get(struct device *dev);
>> > #else
>> > static inline struct backlight_device *backlight_get(struct device *dev)
>> > {
>> > return NULL;
>> > }
>> > +
>> > +static inline struct backlight_device *devm_backlight_get(struct device *dev)
>> > +{
>> > + return NULL;
>> > +}
>> > #endif
>> >
>> > #endif
>>
>> --
>> Jani Nikula, Intel Open Source Technology Center
--
Jani Nikula, Intel Open Source Technology Center
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