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 <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 83 insertions, 0 deletions

diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
new file mode 100644
index 000000000000..979671053436
--- /dev/null
+++ b/drivers/mmc/core/slot-gpio.c
@@ -0,0 +1,83 @@
+/*
+ * Generic GPIO card-detect helper
+ *
+ * Copyright (C) 2011, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/slot-gpio.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+struct mmc_gpio {
+	unsigned int cd_gpio;
+	char cd_label[0];
+};
+
+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_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;
+
+	if (irq < 0)
+		return irq;
+
+	ctx = kmalloc(sizeof(*ctx) + len, GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));
+
+	ret = gpio_request_one(gpio, GPIOF_DIR_IN, ctx->cd_label);
+	if (ret < 0)
+		goto egpioreq;
+
+	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;
+
+	ctx->cd_gpio = gpio;
+	host->hotplug.irq = irq;
+	host->hotplug.handler_priv = ctx;
+
+	return 0;
+
+eirqreq:
+	gpio_free(gpio);
+egpioreq:
+	kfree(ctx);
+	return ret;
+}
+EXPORT_SYMBOL(mmc_gpio_request_cd);
+
+void mmc_gpio_free_cd(struct mmc_host *host)
+{
+	struct mmc_gpio *ctx = host->hotplug.handler_priv;
+
+	if (!ctx)
+		return;
+
+	free_irq(host->hotplug.irq, host);
+	gpio_free(ctx->cd_gpio);
+	kfree(ctx);
+}
+EXPORT_SYMBOL(mmc_gpio_free_cd);