[PATCH 2a/3] mmc: core: Allow host driver to provide isr for card-detect interrupts.

[PATCH 2a/3] mmc: core: Allow host driver to provide isr for card-detect interrupts.

[NeilBrown]

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)
+			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;
+}
+
 /**
  * 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);
 

[PATCH 2b/3] mmc: omap_hsmmc: use slot-gpio library for gpio support.

[NeilBrown]

Using the common code removes some code duplication, and
makes it easier to switch to using mmc_of_parse() which
will remove more duplication.

This uses the new mmc_gpio_request_cd_isr to provide a non-standard
interrupt service routine for card-detect interrupts.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 drivers/mmc/host/omap_hsmmc.c |   67 +++++++++--------------------------------
 1 file changed, 14 insertions(+), 53 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 537cba8f1de1..32514b648e3c 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -36,6 +36,7 @@
 #include <linux/mmc/host.h>
 #include <linux/mmc/core.h>
 #include <linux/mmc/mmc.h>
+#include <linux/mmc/slot-gpio.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/gpio.h>
@@ -251,28 +252,22 @@ static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host);
 static int omap_hsmmc_card_detect(struct device *dev)
 {
 	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
-	struct omap_hsmmc_platform_data *mmc = host->pdata;
 
-	/* NOTE: assumes card detect signal is active-low */
-	return !gpio_get_value_cansleep(mmc->switch_pin);
+	return mmc_gpio_get_cd(host->mmc);
 }
 
 static int omap_hsmmc_get_wp(struct device *dev)
 {
 	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
-	struct omap_hsmmc_platform_data *mmc = host->pdata;
 
-	/* NOTE: assumes write protect signal is active-high */
-	return gpio_get_value_cansleep(mmc->gpio_wp);
+	return mmc_gpio_get_ro(host->mmc);
 }
 
 static int omap_hsmmc_get_cover_state(struct device *dev)
 {
 	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
-	struct omap_hsmmc_platform_data *mmc = host->pdata;
 
-	/* NOTE: assumes card detect signal is active-low */
-	return !gpio_get_value_cansleep(mmc->switch_pin);
+	return mmc_gpio_get_cd(host->mmc);
 }
 
 #ifdef CONFIG_REGULATOR
@@ -439,7 +434,10 @@ static inline int omap_hsmmc_have_reg(void)
 
 #endif
 
-static int omap_hsmmc_gpio_init(struct omap_hsmmc_host *host,
+static irqreturn_t omap_hsmmc_detect(int irq, void *dev_id);
+
+static int omap_hsmmc_gpio_init(struct mmc_host *mmc,
+				struct omap_hsmmc_host *host,
 				struct omap_hsmmc_platform_data *pdata)
 {
 	int ret;
@@ -452,46 +450,26 @@ static int omap_hsmmc_gpio_init(struct omap_hsmmc_host *host,
 			host->card_detect = omap_hsmmc_card_detect;
 		host->card_detect_irq =
 				gpio_to_irq(pdata->switch_pin);
-		ret = gpio_request(pdata->switch_pin, "mmc_cd");
+		ret = mmc_gpio_request_cd_isr(mmc, omap_hsmmc_detect);
 		if (ret)
 			return ret;
-		ret = gpio_direction_input(pdata->switch_pin);
+		ret = mmc_gpio_request_cd(mmc, pdata->switch_pin, 0);
 		if (ret)
-			goto err_free_sp;
+			return ret;
 	} else {
 		pdata->switch_pin = -EINVAL;
 	}
 
 	if (gpio_is_valid(pdata->gpio_wp)) {
 		host->get_ro = omap_hsmmc_get_wp;
-		ret = gpio_request(pdata->gpio_wp, "mmc_wp");
-		if (ret)
-			goto err_free_cd;
-		ret = gpio_direction_input(pdata->gpio_wp);
+		ret = mmc_gpio_request_ro(mmc, pdata->gpio_wp);
 		if (ret)
-			goto err_free_wp;
+			return ret;
 	} else {
 		pdata->gpio_wp = -EINVAL;
 	}
 
 	return 0;
-
-err_free_wp:
-	gpio_free(pdata->gpio_wp);
-err_free_cd:
-	if (gpio_is_valid(pdata->switch_pin))
-err_free_sp:
-		gpio_free(pdata->switch_pin);
-	return ret;
-}
-
-static void omap_hsmmc_gpio_free(struct omap_hsmmc_host *host,
-				 struct omap_hsmmc_platform_data *pdata)
-{
-	if (gpio_is_valid(pdata->gpio_wp))
-		gpio_free(pdata->gpio_wp);
-	if (gpio_is_valid(pdata->switch_pin))
-		gpio_free(pdata->switch_pin);
 }
 
 /*
@@ -2066,7 +2044,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	host->next_data.cookie = 1;
 	host->pbias_enabled = 0;
 
-	ret = omap_hsmmc_gpio_init(host, pdata);
+	ret = omap_hsmmc_gpio_init(mmc, host, pdata);
 	if (ret)
 		goto err_gpio;
 
@@ -2197,20 +2175,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
 	mmc->ocr_avail = mmc_pdata(host)->ocr_mask;
 
-	/* Request IRQ for card detect */
-	if (host->card_detect_irq) {
-		ret = devm_request_threaded_irq(&pdev->dev,
-						host->card_detect_irq,
-						NULL, omap_hsmmc_detect,
-					   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
-					   mmc_hostname(mmc), host);
-		if (ret) {
-			dev_err(mmc_dev(host->mmc),
-				"Unable to grab MMC CD IRQ\n");
-			goto err_irq_cd;
-		}
-	}
-
 	omap_hsmmc_disable_irq(host);
 
 	/*
@@ -2249,7 +2213,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
 err_slot_name:
 	mmc_remove_host(mmc);
-err_irq_cd:
 	if (host->use_reg)
 		omap_hsmmc_reg_put(host);
 err_irq:
@@ -2262,7 +2225,6 @@ err_irq:
 	if (host->dbclk)
 		clk_disable_unprepare(host->dbclk);
 err1:
-	omap_hsmmc_gpio_free(host, pdata);
 err_gpio:
 	mmc_free_host(mmc);
 err:
@@ -2288,7 +2250,6 @@ static int omap_hsmmc_remove(struct platform_device *pdev)
 	if (host->dbclk)
 		clk_disable_unprepare(host->dbclk);
 
-	omap_hsmmc_gpio_free(host, host->pdata);
 	mmc_free_host(host->mmc);
 
 	return 0;

Re: [PATCH 2a/3] mmc: core: Allow host driver to provide isr for card-detect interrupts.

[Ulf Hansson]

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)

> +                       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.

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.

> +
>  /**
>   * 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

Re: [PATCH 2a/3] mmc: core: Allow host driver to provide isr for card-detect interrupts.

[NeilBrown]

[-- Attachment #1: Type: text/plain, Size: 4495 bytes --]

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


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 811 bytes --]

Re: [PATCH 2a/3] mmc: core: Allow host driver to provide isr for card-detect interrupts.

[Ulf Hansson]

On 23 December 2014 at 09:48, NeilBrown <neilb@suse.de> wrote:
> 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.

You are right. I don't think they should.

Let's add the API instead, but rename it to something like
mmc_gpio_set_cd_isr().

Kind regards
Uffe

>
> 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
>