mmc: extend and rename cd-gpio helpers to handle more slot GPIO functions

GPIOs can be used in MMC/SD-card slots not only for hotplug detection, but
also to implement the write-protection pin. Rename cd-gpio helpers to
slot-gpio to make addition of further slot GPIO functions possible.

Signed-off-by: Guennadi Liakhovetski <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>

drivers/mmc/core/Makefile

···
 				   mmc.o mmc_ops.o sd.o sd_ops.o \
 				   sdio.o sdio_ops.o sdio_bus.o \
 				   sdio_cis.o sdio_io.o sdio_irq.o \
-				   quirks.o cd-gpio.o
+				   quirks.o slot-gpio.o
 
 mmc_core-$(CONFIG_DEBUG_FS)	+= debugfs.o

drivers/mmc/core/cd-gpio.c drivers/mmc/core/slot-gpio.c

···
 #include <linux/gpio.h>
 #include <linux/interrupt.h>
 #include <linux/jiffies.h>
-#include <linux/mmc/cd-gpio.h>
 #include <linux/mmc/host.h>
+#include <linux/mmc/slot-gpio.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 
-struct mmc_cd_gpio {
-	unsigned int gpio;
-	char label[0];
+struct mmc_gpio {
+	unsigned int cd_gpio;
+	char cd_label[0];
 };
 
-static irqreturn_t mmc_cd_gpio_irqt(int irq, void *dev_id)
+static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
 {
 	/* Schedule a card detection after a debounce timeout */
 	mmc_detect_change(dev_id, msecs_to_jiffies(100));
 	return IRQ_HANDLED;
 }
 
-int mmc_cd_gpio_request(struct mmc_host *host, unsigned int gpio)
+int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio)
 {
 	size_t len = strlen(dev_name(host->parent)) + 4;
-	struct mmc_cd_gpio *cd;
+	struct mmc_gpio *ctx;
 	int irq = gpio_to_irq(gpio);
 	int ret;
 
 	if (irq < 0)
 		return irq;
 
-	cd = kmalloc(sizeof(*cd) + len, GFP_KERNEL);
-	if (!cd)
+	ctx = kmalloc(sizeof(*ctx) + len, GFP_KERNEL);
+	if (!ctx)
 		return -ENOMEM;
 
-	snprintf(cd->label, len, "%s cd", dev_name(host->parent));
+	snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));
 
-	ret = gpio_request_one(gpio, GPIOF_DIR_IN, cd->label);
+	ret = gpio_request_one(gpio, GPIOF_DIR_IN, ctx->cd_label);
 	if (ret < 0)
 		goto egpioreq;
 
-	ret = request_threaded_irq(irq, NULL, mmc_cd_gpio_irqt,
-				   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
-				   IRQF_ONESHOT, cd->label, host);
+	ret = request_threaded_irq(irq, NULL, mmc_gpio_cd_irqt,
+			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+			ctx->cd_label, host);
 	if (ret < 0)
 		goto eirqreq;
 
-	cd->gpio = gpio;
+	ctx->cd_gpio = gpio;
 	host->hotplug.irq = irq;
-	host->hotplug.handler_priv = cd;
+	host->hotplug.handler_priv = ctx;
 
 	return 0;
 
 eirqreq:
 	gpio_free(gpio);
 egpioreq:
-	kfree(cd);
+	kfree(ctx);
 	return ret;
 }
-EXPORT_SYMBOL(mmc_cd_gpio_request);
+EXPORT_SYMBOL(mmc_gpio_request_cd);
 
-void mmc_cd_gpio_free(struct mmc_host *host)
+void mmc_gpio_free_cd(struct mmc_host *host)
 {
-	struct mmc_cd_gpio *cd = host->hotplug.handler_priv;
+	struct mmc_gpio *ctx = host->hotplug.handler_priv;
 
-	if (!cd)
+	if (!ctx)
 		return;
 
 	free_irq(host->hotplug.irq, host);
-	gpio_free(cd->gpio);
-	kfree(cd);
+	gpio_free(ctx->cd_gpio);
+	kfree(ctx);
 }
-EXPORT_SYMBOL(mmc_cd_gpio_free);
+EXPORT_SYMBOL(mmc_gpio_free_cd);

drivers/mmc/host/tmio_mmc_pio.c

···
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/mfd/tmio.h>
-#include <linux/mmc/cd-gpio.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/mmc.h>
+#include <linux/mmc/slot-gpio.h>
 #include <linux/mmc/tmio.h>
 #include <linux/module.h>
 #include <linux/pagemap.h>
···
 	tmio_mmc_enable_mmc_irqs(_host, irq_mask);
 
 	if (pdata->flags & TMIO_MMC_USE_GPIO_CD) {
-		ret = mmc_cd_gpio_request(mmc, pdata->cd_gpio);
+		ret = mmc_gpio_request_cd(mmc, pdata->cd_gpio);
 		if (ret < 0) {
 			tmio_mmc_host_remove(_host);
 			return ret;
···
 		 * This means we can miss a card-eject, but this is anyway
 		 * possible, because of delayed processing of hotplug events.
 		 */
-		mmc_cd_gpio_free(mmc);
+		mmc_gpio_free_cd(mmc);
 
 	if (!host->native_hotplug)
 		pm_runtime_get_sync(&pdev->dev);

include/linux/mmc/cd-gpio.h include/linux/mmc/slot-gpio.h

···
  * published by the Free Software Foundation.
  */
 
-#ifndef MMC_CD_GPIO_H
-#define MMC_CD_GPIO_H
+#ifndef MMC_SLOT_GPIO_H
+#define MMC_SLOT_GPIO_H
 
 struct mmc_host;
-int mmc_cd_gpio_request(struct mmc_host *host, unsigned int gpio);
-void mmc_cd_gpio_free(struct mmc_host *host);
+int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio);
+void mmc_gpio_free_cd(struct mmc_host *host);
 
 #endif