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

Commit Message

NeilBrown Dec. 11, 2014, 9:43 p.m. UTC

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

As hsmmc has a slightly different interrupt service routine
for card-detect, enhance slot-gpio to allow an alternate
routine to be provided.

Signed-off-by: NeilBrown <[e-mail]>
---
 drivers/mmc/core/slot-gpio.c  |   24 ++++++++++++++-
 drivers/mmc/host/omap_hsmmc.c |   67 +++++++++--------------------------------
 include/linux/mmc/slot-gpio.h |    2 +
 3 files changed, 39 insertions(+), 54 deletions(-)



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Comments

Ulf Hansson Dec. 19, 2014, 11:22 a.m. UTC | #1

On 11 December 2014 at 22:43, NeilBrown <[e-mail]> wrote:
> Using the common code removes some code duplication, and
> makes it easier to switch to using mmc_of_parse() which
> will remove more duplication.
>
> As hsmmc has a slightly different interrupt service routine
> for card-detect, enhance slot-gpio to allow an alternate
> routine to be provided.
>
> Signed-off-by: NeilBrown <[e-mail]>
> ---
>  drivers/mmc/core/slot-gpio.c  |   24 ++++++++++++++-
>  drivers/mmc/host/omap_hsmmc.c |   67 +++++++++--------------------------------
>  include/linux/mmc/slot-gpio.h |    2 +
>  3 files changed, 39 insertions(+), 54 deletions(-)

I like the looks of this patch, still I want the mmc core parts to be
separated into it's own patch. Can you please split this up.

Kind regards
Uffe

>
> 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/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;
> 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);
>
>
>
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Patch

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/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;
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);