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

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Message-ID: <20141219230732.7511.28103.stgit@notabene.brown>
Date:	Sat, 20 Dec 2014 10:07:38 +1100
From:	NeilBrown <neilb@...e.de>
To:	Ulf Hansson <ulf.hansson@...aro.org>, Chris Ball <chris@...ntf.net>
Cc:	GTA04 owners <gta04-owner@...delico.com>,
	linux-omap <linux-omap@...r.kernel.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Felipe Balbi <balbi@...com>
Subject: [PATCH 2a/3] mmc: core: Allow host driver to provide isr for
 card-detect interrupts.

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@...e.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);
 


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