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SubjectRe: [PATCH 2a/3] mmc: core: Allow host driver to provide isr for card-detect interrupts.
On Mon, 22 Dec 2014 16:35:40 +0100 Ulf Hansson <ulf.hansson@linaro.org> wrote:

> On 20 December 2014 at 00:07, NeilBrown <neilb@suse.de> wrote:
> > One of the reasons omap_hsmmc doesn't use the slot-gpio library
> > is that it has some non-standard functionality in the card-detect
> > interrupt service routine.
> >
> > To make it possible for omap_hsmmc (and maybe others) to be converted
> > to use slot-gpio, add 'mmc_gpio_request_cd_isr' which provide an
> > alternate isr to be register by the slot-gpio code.
> >
> > Signed-off-by: NeilBrown <neilb@suse.de>
> > ---
> > drivers/mmc/core/slot-gpio.c | 24 +++++++++++++++++++++++-
> > include/linux/mmc/slot-gpio.h | 2 ++
> > 2 files changed, 25 insertions(+), 1 deletion(-)
> >
> > This and following are the result of splitting the previous
> > '2/3' into to patches: core and omap_hsmmc as requested.
> >
> > NeilBrown
> >
> >
> > diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
> > index 69bbf2adb329..f56323f5a996 100644
> > --- a/drivers/mmc/core/slot-gpio.c
> > +++ b/drivers/mmc/core/slot-gpio.c
> > @@ -23,6 +23,7 @@ struct mmc_gpio {
> > struct gpio_desc *cd_gpio;
> > bool override_ro_active_level;
> > bool override_cd_active_level;
> > + irqreturn_t (*cd_gpio_isr)(int irq, void *dev_id);
> > char *ro_label;
> > char cd_label[0];
> > };
> > @@ -156,8 +157,10 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
> > irq = -EINVAL;
> >
> > if (irq >= 0) {
> > + if (ctx->cd_gpio_isr == NULL)
>
> Please change to:
> if (!ctx->cd_gpio_isr)

will do (though I personally prefer the explicit "NULL" :-).

>
> > + ctx->cd_gpio_isr = mmc_gpio_cd_irqt;
> > ret = devm_request_threaded_irq(&host->class_dev, irq,
> > - NULL, mmc_gpio_cd_irqt,
> > + NULL, ctx->cd_gpio_isr,
> > IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> > ctx->cd_label, host);
> > if (ret < 0)
> > @@ -171,6 +174,25 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
> > }
> > EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);
> >
> > +/* Register an alternate interrupt service routine for
> > + * the card-detect GPIO.
> > + */
> > +int mmc_gpio_request_cd_isr(struct mmc_host *host,
> > + irqreturn_t (*isr)(int irq, void *dev_id))
> > +{
> > + struct mmc_gpio *ctx;
> > + int ret;
> > +
> > + ret = mmc_gpio_alloc(host);
> > + if (ret < 0)
> > + return ret;
> > + ctx = host->slot.handler_priv;
> > + if (ctx->cd_gpio_isr)
> > + return -EBUSY;
> > + ctx->cd_gpio_isr = isr;
> > + return 0;
> > +}
>
> I decided to queue those patchsets I recently posted which simplifies
> the slot-gpio API. Please re-base this patch on top of my next branch.

OK.

>
> Moreover, I actually wonder whether we need to add this API at all.
> After my changes, all you need to do from your host driver ->probe(),
> is to assign your isr routine to ctx->cd_gpio_isr.

'struct mmc_gpio' is local to slot-gpio.c, so code in other files cannot
access the members directly.

If you want to move it to include/linux/mmc/host.h and change
void *handler_priv;
to
struct mmc_gpio *gpios;

or similar, then I'll happily update it directly.
What do you think?

NeilBrown


>
> > +
> > /**
> > * mmc_gpio_request_cd - request a gpio for card-detection
> > * @host: mmc host
> > diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h
> > index e56fa24c9322..9e55db60deb0 100644
> > --- a/include/linux/mmc/slot-gpio.h
> > +++ b/include/linux/mmc/slot-gpio.h
> > @@ -28,6 +28,8 @@ int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
> > int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
> > unsigned int idx, bool override_active_level,
> > unsigned int debounce, bool *gpio_invert);
> > +int mmc_gpio_request_cd_isr(struct mmc_host *host,
> > + irqreturn_t (*isr)(int irq, void *dev_id));
> > void mmc_gpiod_free_cd(struct mmc_host *host);
> > void mmc_gpiod_request_cd_irq(struct mmc_host *host);
> >
> >
> >
>
> Kind regards
> Uffe

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