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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>
hifive-unleashed-5.1
Guennadi Liakhovetski 2012-04-30 23:31:57 +02:00 committed by Chris Ball
parent 0f506a9669
commit fd0ea65d3e
4 changed files with 32 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/mmc/core/Makefile
View File

@ -7,6 +7,6 @@ mmc_core-y := core.o bus.o host.o \
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

48
drivers/mmc/core/cd-gpio.c → drivers/mmc/core/slot-gpio.c
View File

@ -12,72 +12,72 @@
#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);

6
drivers/mmc/host/tmio_mmc_pio.c
View File

@ -34,9 +34,9 @@
#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>
@ -977,7 +977,7 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host,
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;
@ -1009,7 +1009,7 @@ void tmio_mmc_host_remove(struct tmio_mmc_host *host)
* 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);

8
include/linux/mmc/cd-gpio.h → include/linux/mmc/slot-gpio.h
View File

@ -8,11 +8,11 @@
* 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