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Commit a7d1a1eb authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Chris Ball
Browse files

mmc: core: convert slot functions to managed allocation 



This prepares for the addition of further slot functions.

Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent befe4048

drivers/mmc/core/host.c

+2 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
static void mmc_host_classdev_release(struct device *dev)

{

	struct mmc_host *host = cls_dev_to_mmc_host(dev);

	mutex_destroy(&host->slot.lock);

	kfree(host);

}
@@ -327,6 +328,7 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev) 


	mmc_host_clk_init(host);



	mutex_init(&host->slot.lock);

	host->slot.cd_irq = -EINVAL;



	spin_lock_init(&host->lock);

drivers/mmc/core/slot-gpio.c

+38 −13
Original line number Diff line number Diff line
@@ -29,6 +29,34 @@ static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id) 
	return IRQ_HANDLED;

}



static int mmc_gpio_alloc(struct mmc_host *host)

{

	size_t len = strlen(dev_name(host->parent)) + 4;

	struct mmc_gpio *ctx;



	mutex_lock(&host->slot.lock);



	ctx = host->slot.handler_priv;

	if (!ctx) {

		/*

		 * devm_kzalloc() can be called after device_initialize(), even

		 * before device_add(), i.e., between mmc_alloc_host() and

		 * mmc_add_host()

		 */

		ctx = devm_kzalloc(&host->class_dev, sizeof(*ctx) + len,

				   GFP_KERNEL);

		if (ctx) {

			snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));

			ctx->cd_gpio = -EINVAL;

			host->slot.handler_priv = ctx;

		}

	}



	mutex_unlock(&host->slot.lock);



	return ctx ? 0 : -ENOMEM;

}



int mmc_gpio_get_cd(struct mmc_host *host)

{

	struct mmc_gpio *ctx = host->slot.handler_priv;
@@ -43,20 +71,24 @@ EXPORT_SYMBOL(mmc_gpio_get_cd); 


int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio)

{

	size_t len = strlen(dev_name(host->parent)) + 4;

	struct mmc_gpio *ctx;

	int irq = gpio_to_irq(gpio);

	int ret;



	ctx = kmalloc(sizeof(*ctx) + len, GFP_KERNEL);

	if (!ctx)

		return -ENOMEM;

	ret = mmc_gpio_alloc(host);

	if (ret < 0)

		return ret;



	snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));

	ctx = host->slot.handler_priv;



	ret = gpio_request_one(gpio, GPIOF_DIR_IN, ctx->cd_label);

	if (ret < 0)

		goto egpioreq;

		/*

		 * don't bother freeing memory. It might still get used by other

		 * slot functions, in any case it will be freed, when the device

		 * is destroyed.

		 */

		return ret;



	/*

	 * Even if gpio_to_irq() returns a valid IRQ number, the platform might
@@ -80,13 +112,8 @@ int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio) 
		host->caps |= MMC_CAP_NEEDS_POLL;



	ctx->cd_gpio = gpio;

	host->slot.handler_priv = ctx;



	return 0;



egpioreq:

	kfree(ctx);

	return ret;

}

EXPORT_SYMBOL(mmc_gpio_request_cd);
@@ -107,7 +134,5 @@ void mmc_gpio_free_cd(struct mmc_host *host) 
	ctx->cd_gpio = -EINVAL;



	gpio_free(gpio);

	host->slot.handler_priv = NULL;

	kfree(ctx);

}

EXPORT_SYMBOL(mmc_gpio_free_cd);

include/linux/mmc/host.h

+3 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#define LINUX_MMC_HOST_H



#include <linux/leds.h>

#include <linux/mutex.h>

#include <linux/sched.h>

#include <linux/device.h>

#include <linux/fault-inject.h>
@@ -154,6 +155,7 @@ struct mmc_async_req { 
 * struct mmc_slot - MMC slot functions

 *

 * @cd_irq:		MMC/SD-card slot hotplug detection IRQ or -EINVAL

 * @lock:		protect the @handler_priv pointer

 * @handler_priv:	MMC/SD-card slot context

 *

 * Some MMC/SD host controllers implement slot-functions like card and
@@ -163,6 +165,7 @@ struct mmc_async_req { 
 */

struct mmc_slot {

	int cd_irq;

	struct mutex lock;

	void *handler_priv;

};