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mmc: mmc_spi: Support CD/RO GPIOs 

Add support for passing CD/RO GPIO numbers directly to the mmc_spi
driver instead of relying solely on board code callbacks to retrieve the
CD/RO signals values. The driver will enable debouncing on the card
detect GPIO if the cd_debounce field is set to a non-zero value.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Laurent Pinchart 2013-08-08 12:38:32 +02:00 committed by Chris Ball
parent 214fc309d1
commit bf287a90ce
3 changed files with 52 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/mmc/host/mmc_spi.c
View File

@ -36,6 +36,7 @@
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h> /* for R1_SPI_* bit values */
#include <linux/mmc/slot-gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/mmc_spi.h>
@ -1278,11 +1279,8 @@ static int mmc_spi_get_ro(struct mmc_host *mmc)
if (host->pdata && host->pdata->get_ro)
return !!host->pdata->get_ro(mmc->parent);
/*
* Board doesn't support read only detection; let the mmc core
* decide what to do.
*/
return -ENOSYS;
else
return mmc_gpio_get_ro(mmc);
}
static int mmc_spi_get_cd(struct mmc_host *mmc)
@ -1291,7 +1289,8 @@ static int mmc_spi_get_cd(struct mmc_host *mmc)
if (host->pdata && host->pdata->get_cd)
return !!host->pdata->get_cd(mmc->parent);
return -ENOSYS;
else
return mmc_gpio_get_cd(mmc);
}
static const struct mmc_host_ops mmc_spi_ops = {
@ -1324,6 +1323,7 @@ static int mmc_spi_probe(struct spi_device *spi)
struct mmc_host *mmc;
struct mmc_spi_host *host;
int status;
bool has_ro = false;
/* We rely on full duplex transfers, mostly to reduce
* per-transfer overheads (by making fewer transfers).
@ -1448,18 +1448,33 @@ static int mmc_spi_probe(struct spi_device *spi)
}
/* pass platform capabilities, if any */
if (host->pdata)
if (host->pdata) {
mmc->caps |= host->pdata->caps;
mmc->caps2 |= host->pdata->caps2;
}
status = mmc_add_host(mmc);
if (status != 0)
goto fail_add_host;
if (host->pdata && host->pdata->flags & MMC_SPI_USE_CD_GPIO) {
status = mmc_gpio_request_cd(mmc, host->pdata->cd_gpio,
host->pdata->cd_debounce);
if (status != 0)
goto fail_add_host;
}
if (host->pdata && host->pdata->flags & MMC_SPI_USE_RO_GPIO) {
has_ro = true;
status = mmc_gpio_request_ro(mmc, host->pdata->ro_gpio);
if (status != 0)
goto fail_add_host;
}
dev_info(&spi->dev, "SD/MMC host %s%s%s%s%s\n",
dev_name(&mmc->class_dev),
host->dma_dev ? "" : ", no DMA",
(host->pdata && host->pdata->get_ro)
? "" : ", no WP",
has_ro ? "" : ", no WP",
(host->pdata && host->pdata->setpower)
? "" : ", no poweroff",
(mmc->caps & MMC_CAP_NEEDS_POLL)

46
drivers/mmc/host/of_mmc_spi.c
View File

@ -50,25 +50,6 @@ static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
return container_of(dev->platform_data, struct of_mmc_spi, pdata);
}
static int of_mmc_spi_read_gpio(struct device *dev, int gpio_num)
{
struct of_mmc_spi *oms = to_of_mmc_spi(dev);
bool active_low = oms->alow_gpios[gpio_num];
bool value = gpio_get_value(oms->gpios[gpio_num]);
return active_low ^ value;
}
static int of_mmc_spi_get_cd(struct device *dev)
{
return of_mmc_spi_read_gpio(dev, CD_GPIO);
}
static int of_mmc_spi_get_ro(struct device *dev)
{
return of_mmc_spi_read_gpio(dev, WP_GPIO);
}
static int of_mmc_spi_init(struct device *dev,
irqreturn_t (*irqhandler)(int, void *), void *mmc)
{
@ -130,20 +111,22 @@ struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
if (!gpio_is_valid(oms->gpios[i]))
continue;
ret = gpio_request(oms->gpios[i], dev_name(dev));
if (ret < 0) {
oms->gpios[i] = -EINVAL;
continue;
}
if (gpio_flags & OF_GPIO_ACTIVE_LOW)
oms->alow_gpios[i] = true;
}
if (gpio_is_valid(oms->gpios[CD_GPIO]))
oms->pdata.get_cd = of_mmc_spi_get_cd;
if (gpio_is_valid(oms->gpios[WP_GPIO]))
oms->pdata.get_ro = of_mmc_spi_get_ro;
if (gpio_is_valid(oms->gpios[CD_GPIO])) {
oms->pdata.cd_gpio = oms->gpios[CD_GPIO];
oms->pdata.flags |= MMC_SPI_USE_CD_GPIO;
if (!oms->alow_gpios[CD_GPIO])
oms->pdata.caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
}
if (gpio_is_valid(oms->gpios[WP_GPIO])) {
oms->pdata.ro_gpio = oms->gpios[WP_GPIO];
oms->pdata.flags |= MMC_SPI_USE_RO_GPIO;
if (!oms->alow_gpios[WP_GPIO])
oms->pdata.caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
}
oms->detect_irq = irq_of_parse_and_map(np, 0);
if (oms->detect_irq != 0) {
@ -166,15 +149,10 @@ void mmc_spi_put_pdata(struct spi_device *spi)
struct device *dev = &spi->dev;
struct device_node *np = dev->of_node;
struct of_mmc_spi *oms = to_of_mmc_spi(dev);
int i;
if (!dev->platform_data || !np)
return;
for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
if (gpio_is_valid(oms->gpios[i]))
gpio_free(oms->gpios[i]);
}
kfree(oms);
dev->platform_data = NULL;
}

16
include/linux/spi/mmc_spi.h
View File

@ -7,6 +7,11 @@
struct device;
struct mmc_host;
#define MMC_SPI_USE_CD_GPIO (1 << 0)
#define MMC_SPI_USE_RO_GPIO (1 << 1)
#define MMC_SPI_CD_GPIO_ACTIVE_LOW (1 << 2)
#define MMC_SPI_RO_GPIO_ACTIVE_LOW (1 << 3)
/* Put this in platform_data of a device being used to manage an MMC/SD
* card slot. (Modeled after PXA mmc glue; see that for usage examples.)
*
@ -30,8 +35,19 @@ struct mmc_spi_platform_data {
*/
int (*get_cd)(struct device *);
/*
* Card Detect and Read Only GPIOs. To enable debouncing on the card
* detect GPIO, set the cd_debounce to the debounce time in
* microseconds.
*/
unsigned int flags;
unsigned int cd_gpio;
unsigned int cd_debounce;
unsigned int ro_gpio;
/* Capabilities to pass into mmc core (e.g. MMC_CAP_NEEDS_POLL). */
unsigned long caps;
unsigned long caps2;
/* how long to debounce card detect, in msecs */
u16 detect_delay;