[PATCH 2/3] mmc: omap_hsmmc: use slot-gpio library for gpio support.

NeilBrown
2014-11-07T23:52:28Z

Using the common code removes some code duplication, and
makes it easier to switch to using mmc_of_parse() which
will remove more duplication.

As hsmmc has a slightly different interrupt service routine
for card-detect, enhance slot-gpio to allow an alternate
routine to be provided.

Signed-off-by: NeilBrown <neilb@suse.de>
---
drivers/mmc/core/slot-gpio.c | 21 +++++++++++-
drivers/mmc/host/omap_hsmmc.c | 73 ++++++++++-------------------------------
include/linux/mmc/slot-gpio.h | 2 +
3 files changed, 39 insertions(+), 57 deletions(-)

diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index 5f89cb83d5f0..f3bc51f9aba9 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -23,6 +23,7 @@ struct mmc_gpio {
struct gpio_desc *cd_gpio;
bool override_ro_active_level;
bool override_cd_active_level;
+ irqreturn_t (*cd_gpio_isr)(int irq, void *dev_id);
char *ro_label;
char cd_label[0];
};
@@ -156,8 +157,10 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
irq = -EINVAL;

if (irq >= 0) {
+ if (ctx->cd_gpio_isr == NULL)
+ ctx->cd_gpio_isr = mmc_gpio_cd_irqt;
ret = devm_request_threaded_irq(&host->class_dev, irq,
- NULL, mmc_gpio_cd_irqt,
+ NULL, ctx->cd_gpio_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
ctx->cd_label, host);
if (ret < 0)
@@ -171,6 +174,22 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
}
EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);

+int mmc_gpio_request_cd_isr(struct mmc_host *host,
+ irqreturn_t (*isr)(int irq, void *dev_id))
+{
+ struct mmc_gpio *ctx;
+ int ret;
+
+ ret = mmc_gpio_alloc(host);
+ if (ret < 0)
+ return ret;
+ ctx = host->slot.handler_priv;
+ if (ctx->cd_gpio_isr)
+ return -EBUSY;
+ ctx->cd_gpio_isr = isr;
+ return 0;
+}
+
/**
* mmc_gpio_request_cd - request a gpio for card-detection
* @host: mmc host
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 6958e6898d03..3fe02cf077ec 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -36,6 +36,7 @@
#include <linux/mmc/host.h>
#include <linux/mmc/core.h>
#include <linux/mmc/mmc.h>
+#include <linux/mmc/slot-gpio.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/gpio.h>
@@ -233,28 +234,22 @@ static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host);
static int omap_hsmmc_card_detect(struct device *dev, int slot)
{
struct omap_hsmmc_host *host = dev_get_drvdata(dev);
- struct omap_mmc_platform_data *mmc = host->pdata;

- /* NOTE: assumes card detect signal is active-low */
- return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
+ return mmc_gpio_get_cd(host->mmc);
}

static int omap_hsmmc_get_wp(struct device *dev, int slot)
{
struct omap_hsmmc_host *host = dev_get_drvdata(dev);
- struct omap_mmc_platform_data *mmc = host->pdata;

- /* NOTE: assumes write protect signal is active-high */
- return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
+ return mmc_gpio_get_ro(host->mmc);
}

static int omap_hsmmc_get_cover_state(struct device *dev, int slot)
{
struct omap_hsmmc_host *host = dev_get_drvdata(dev);
- struct omap_mmc_platform_data *mmc = host->pdata;

- /* NOTE: assumes card detect signal is active-low */
- return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
+ return mmc_gpio_get_cd(host->mmc);
}

#ifdef CONFIG_REGULATOR
@@ -422,7 +417,10 @@ static inline int omap_hsmmc_have_reg(void)

#endif

-static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
+static irqreturn_t omap_hsmmc_detect(int irq, void *dev_id);
+
+static int omap_hsmmc_gpio_init(struct mmc_host *mmc,
+ struct omap_mmc_platform_data *pdata)
{
int ret;

@@ -434,43 +432,24 @@ static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
pdata->slots[0].card_detect = omap_hsmmc_card_detect;
pdata->slots[0].card_detect_irq =
gpio_to_irq(pdata->slots[0].switch_pin);
- ret = gpio_request(pdata->slots[0].switch_pin, "mmc_cd");
+ ret = mmc_gpio_request_cd_isr(mmc, omap_hsmmc_detect);
if (ret)
return ret;
- ret = gpio_direction_input(pdata->slots[0].switch_pin);
+ ret = mmc_gpio_request_cd(mmc, pdata->slots[0].switch_pin, 0);
if (ret)
- goto err_free_sp;
+ return ret;
} else
pdata->slots[0].switch_pin = -EINVAL;

if (gpio_is_valid(pdata->slots[0].gpio_wp)) {
pdata->slots[0].get_ro = omap_hsmmc_get_wp;
- ret = gpio_request(pdata->slots[0].gpio_wp, "mmc_wp");
- if (ret)
- goto err_free_cd;
- ret = gpio_direction_input(pdata->slots[0].gpio_wp);
+ ret = mmc_gpio_request_ro(mmc, pdata->slots[0].gpio_wp);
if (ret)
- goto err_free_wp;
+ return ret;
} else
pdata->slots[0].gpio_wp = -EINVAL;

return 0;
-
-err_free_wp:
- gpio_free(pdata->slots[0].gpio_wp);
-err_free_cd:
- if (gpio_is_valid(pdata->slots[0].switch_pin))
-err_free_sp:
- gpio_free(pdata->slots[0].switch_pin);
- return ret;
-}
-
-static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
-{
- if (gpio_is_valid(pdata->slots[0].gpio_wp))
- gpio_free(pdata->slots[0].gpio_wp);
- if (gpio_is_valid(pdata->slots[0].switch_pin))
- gpio_free(pdata->slots[0].switch_pin);
}

/*
@@ -2025,16 +2004,16 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
if (IS_ERR(base))
return PTR_ERR(base);

- ret = omap_hsmmc_gpio_init(pdata);
- if (ret)
- goto err;
-
mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
if (!mmc) {
ret = -ENOMEM;
goto err_alloc;
}

+ ret = omap_hsmmc_gpio_init(mmc, pdata);
+ if (ret)
+ goto err1;
+
host = mmc_priv(mmc);
host->mmc = mmc;
host->pdata = pdata;
@@ -2184,20 +2163,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)

mmc->ocr_avail = mmc_slot(host).ocr_mask;

- /* Request IRQ for card detect */
- if ((mmc_slot(host).card_detect_irq)) {
- ret = devm_request_threaded_irq(&pdev->dev,
- mmc_slot(host).card_detect_irq,
- NULL, omap_hsmmc_detect,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
- mmc_hostname(mmc), host);
- if (ret) {
- dev_err(mmc_dev(host->mmc),
- "Unable to grab MMC CD IRQ\n");
- goto err_irq_cd;
- }
- }
-
omap_hsmmc_disable_irq(host);

/*
@@ -2236,7 +2201,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)

err_slot_name:
mmc_remove_host(mmc);
-err_irq_cd:
if (host->use_reg)
omap_hsmmc_reg_put(host);
err_reg:
@@ -2254,8 +2218,6 @@ err_irq:
err1:
mmc_free_host(mmc);
err_alloc:
- omap_hsmmc_gpio_free(pdata);
-err:
return ret;
}

@@ -2280,7 +2242,6 @@ static int omap_hsmmc_remove(struct platform_device *pdev)
if (host->dbclk)
clk_disable_unprepare(host->dbclk);

- omap_hsmmc_gpio_free(host->pdata);
mmc_free_host(host->mmc);

return 0;
diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h
index d2433381e828..a119892cebdb 100644
--- a/include/linux/mmc/slot-gpio.h
+++ b/include/linux/mmc/slot-gpio.h
@@ -25,6 +25,8 @@ void mmc_gpio_free_cd(struct mmc_host *host);
int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
unsigned int idx, bool override_active_level,
unsigned int debounce);
+int mmc_gpio_request_cd_isr(struct mmc_host *host,
+ irqreturn_t (*isr)(int irq, void *dev_id));
void mmc_gpiod_free_cd(struct mmc_host *host);
void mmc_gpiod_request_cd_irq(struct mmc_host *host);