This is a RFC patch only, please do not apply it.
This introduce a conversion slot-gpio to gpiod-* API.
Usage of gpiod-* API allows us to remove all pieces of storage
GPIOs in the driver's platform_data in the future.
Patch saves calls to existing functions that allows us to convert
all drivers to use new interface, one by one.
Ready for comments and suggestions.
---
drivers/mmc/core/slot-gpio.c | 221 ++++++++++++++++++++++++++----------------
include/linux/mmc/slot-gpio.h | 10 +-
2 files changed, 148 insertions(+), 83 deletions(-)
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index 46596b71..6fc0483 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -14,17 +14,14 @@
#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 {
- int ro_gpio;
- int cd_gpio;
- char *ro_label;
- char cd_label[0];
+ struct gpio_desc *ro_gpio;
+ struct gpio_desc *cd_gpio;
+ char *cd_label;
};
-static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
+static irqreturn_t mmc_gpio_cd_irq(int irq, void *dev_id)
{
/* Schedule a card detection after a debounce timeout */
struct mmc_host *host = dev_id;
@@ -37,34 +34,26 @@ static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static int mmc_gpio_alloc(struct mmc_host *host)
+static int mmc_gpiod_alloc(struct mmc_host *host)
{
size_t len = strlen(dev_name(host->parent)) + 4;
- struct mmc_gpio *ctx;
-
- mutex_lock(&host->slot.lock);
+ struct mmc_gpio *ctx = host->slot.handler_priv;
- ctx = host->slot.handler_priv;
if (!ctx) {
/*
* devm_kzalloc() can be called after device_initialize(), even
* before device_add(), i.e., between mmc_alloc_host() and
* mmc_add_host()
*/
- ctx = devm_kzalloc(&host->class_dev, sizeof(*ctx) + 2 * len,
+ ctx = devm_kzalloc(&host->class_dev, sizeof(*ctx) + len,
GFP_KERNEL);
if (ctx) {
- ctx->ro_label = ctx->cd_label + len;
- snprintf(ctx->cd_label, len, "%s cd",
dev_name(host->parent));
- snprintf(ctx->ro_label, len, "%s ro",
dev_name(host->parent));
- ctx->cd_gpio = -EINVAL;
- ctx->ro_gpio = -EINVAL;
+ snprintf(ctx->cd_label, len, "%s cd",
+ dev_name(host->parent));
host->slot.handler_priv = ctx;
}
}
- mutex_unlock(&host->slot.lock);
-
return ctx ? 0 : -ENOMEM;
}
@@ -72,10 +61,10 @@ int mmc_gpio_get_ro(struct mmc_host *host)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
- if (!ctx || !gpio_is_valid(ctx->ro_gpio))
+ if (!ctx || IS_ERR_OR_NULL(ctx->ro_gpio))
return -ENOSYS;
- return !gpio_get_value_cansleep(ctx->ro_gpio) ^
+ return !gpiod_get_value_cansleep(ctx->ro_gpio) ^
!!(host->caps2 & MMC_CAP2_RO_ACTIVE_HIGH);
}
EXPORT_SYMBOL(mmc_gpio_get_ro);
@@ -84,18 +73,17 @@ int mmc_gpio_get_cd(struct mmc_host *host)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
- if (!ctx || !gpio_is_valid(ctx->cd_gpio))
+ if (!ctx || IS_ERR_OR_NULL(ctx->cd_gpio))
return -ENOSYS;
- return !gpio_get_value_cansleep(ctx->cd_gpio) ^
+ return !gpiod_get_value_cansleep(ctx->cd_gpio) ^
!!(host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH);
}
EXPORT_SYMBOL(mmc_gpio_get_cd);
/**
- * mmc_gpio_request_ro - request a gpio for write-protection
+ * mmc_gpiod_request_ro - request a gpio for write-protection
* @host: mmc host
- * @gpio: gpio number requested
*
* As devm_* managed functions are used in mmc_gpio_request_ro(), client
* drivers do not need to explicitly call mmc_gpio_free_ro() for freeing up,
@@ -106,35 +94,45 @@ EXPORT_SYMBOL(mmc_gpio_get_cd);
*
* Returns zero on success, else an error.
*/
-int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)
+int mmc_gpiod_request_ro(struct mmc_host *host)
{
- struct mmc_gpio *ctx;
+ struct mmc_gpio *ctx = host->slot.handler_priv;
int ret;
- if (!gpio_is_valid(gpio))
- return -EINVAL;
-
- ret = mmc_gpio_alloc(host);
- if (ret < 0)
+ ret = mmc_gpiod_alloc(host);
+ if (ret)
return ret;
- ctx = host->slot.handler_priv;
+ ctx->ro_gpio = devm_gpiod_get(&host->class_dev, "wp");
+ if (IS_ERR(ctx->ro_gpio))
+ return PTR_ERR(ctx->ro_gpio);
+
+ return gpiod_direction_input(ctx->ro_gpio);
+}
+EXPORT_SYMBOL(mmc_gpiod_request_ro);
+
+int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)
+{
+ struct mmc_gpio *ctx = host->slot.handler_priv;
+ int ret;
+
+ ret = mmc_gpiod_alloc(host);
+ if (ret)
+ return ret;
- ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_DIR_IN,
- ctx->ro_label);
- if (ret < 0)
+ ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_IN, "wp");
+ if (ret)
return ret;
- ctx->ro_gpio = gpio;
+ ctx->ro_gpio = gpio_to_desc(gpio);
- return 0;
+ return IS_ERR(ctx->ro_gpio) ? PTR_ERR(ctx->ro_gpio) : 0;
}
EXPORT_SYMBOL(mmc_gpio_request_ro);
/**
- * mmc_gpio_request_cd - request a gpio for card-detection
+ * mmc_gpiod_request_cd - request a gpio for card-detection
* @host: mmc host
- * @gpio: gpio number requested
* @debounce: debounce time in microseconds
*
* As devm_* managed functions are used in mmc_gpio_request_cd(), client
@@ -150,60 +148,98 @@ EXPORT_SYMBOL(mmc_gpio_request_ro);
*
* Returns zero on success, else an error.
*/
-int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
- unsigned int debounce)
+int mmc_gpiod_request_cd(struct mmc_host *host, unsigned int debounce)
{
- struct mmc_gpio *ctx;
- int irq = gpio_to_irq(gpio);
+ struct mmc_gpio *ctx = host->slot.handler_priv;
int ret;
- ret = mmc_gpio_alloc(host);
- if (ret < 0)
+ ret = mmc_gpiod_alloc(host);
+ if (ret)
return ret;
- ctx = host->slot.handler_priv;
+ ctx->cd_gpio = devm_gpiod_get(&host->class_dev, "cd");
+ if (IS_ERR(ctx->cd_gpio))
+ return PTR_ERR(ctx->cd_gpio);
- ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_DIR_IN,
- ctx->cd_label);
- if (ret < 0)
- /*
- * don't bother freeing memory. It might still get used by other
- * slot functions, in any case it will be freed, when the device
- * is destroyed.
- */
+ ret = gpiod_direction_input(ctx->cd_gpio);
+ if (ret)
return ret;
if (debounce) {
- ret = gpio_set_debounce(gpio, debounce);
- if (ret < 0)
+ ret = gpiod_set_debounce(ctx->cd_gpio, debounce);
+ if (ret)
return ret;
}
/*
- * Even if gpio_to_irq() returns a valid IRQ number, the platform might
+ * Even if gpiod_to_irq() returns a valid IRQ number, the platform might
* still prefer to poll, e.g., because that IRQ number is already used
* by another unit and cannot be shared.
*/
- if (irq >= 0 && host->caps & MMC_CAP_NEEDS_POLL)
- irq = -EINVAL;
-
- if (irq >= 0) {
- ret = devm_request_threaded_irq(&host->class_dev, irq,
- NULL, mmc_gpio_cd_irqt,
+ if (!(host->caps & MMC_CAP_NEEDS_POLL)) {
+ host->slot.cd_irq = gpiod_to_irq(ctx->cd_gpio);
+ ret = devm_request_threaded_irq(&host->class_dev,
+ host->slot.cd_irq, NULL, mmc_gpio_cd_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
ctx->cd_label, host);
- if (ret < 0)
- irq = ret;
+ if (ret)
+ host->slot.cd_irq = ret;
+ } else {
+ host->slot.cd_irq = -EINVAL;
}
- host->slot.cd_irq = irq;
-
- if (irq < 0)
+ if (host->slot.cd_irq < 0)
host->caps |= MMC_CAP_NEEDS_POLL;
- ctx->cd_gpio = gpio;
+ return ret;
+}
+EXPORT_SYMBOL(mmc_gpiod_request_cd);
+
+int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
+ unsigned int debounce)
+{
+ struct mmc_gpio *ctx = host->slot.handler_priv;
+ int ret;
+
+ ret = mmc_gpiod_alloc(host);
+ if (ret)
+ return ret;
- return 0;
+ ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_IN, "cd");
+ if (ret)
+ return ret;
+
+ ctx->cd_gpio = gpio_to_desc(gpio);
+ if (IS_ERR(ctx->cd_gpio))
+ return PTR_ERR(ctx->cd_gpio);
+
+ if (debounce) {
+ ret = gpiod_set_debounce(ctx->cd_gpio, debounce);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * Even if gpiod_to_irq() returns a valid IRQ number, the platform might
+ * still prefer to poll, e.g., because that IRQ number is already used
+ * by another unit and cannot be shared.
+ */
+ if (!(host->caps & MMC_CAP_NEEDS_POLL)) {
+ host->slot.cd_irq = gpiod_to_irq(ctx->cd_gpio);
+ ret = devm_request_threaded_irq(&host->class_dev,
+ host->slot.cd_irq, NULL, mmc_gpio_cd_irq,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
+ ctx->cd_label, host);
+ if (ret)
+ host->slot.cd_irq = ret;
+ } else {
+ host->slot.cd_irq = -EINVAL;
+ }
+
+ if (host->slot.cd_irq < 0)
+ host->caps |= MMC_CAP_NEEDS_POLL;
+
+ return ret;
}
EXPORT_SYMBOL(mmc_gpio_request_cd);
@@ -214,18 +250,41 @@ EXPORT_SYMBOL(mmc_gpio_request_cd);
* It's provided only for cases that client drivers need to manually free
* up the write-protection gpio requested by mmc_gpio_request_ro().
*/
+void mmc_gpiod_free(struct mmc_host *host)
+{
+ struct mmc_gpio *ctx = host->slot.handler_priv;
+
+ if (!ctx)
+ return;
+
+ if (!IS_ERR_OR_NULL(ctx->ro_gpio))
+ devm_gpiod_put(&host->class_dev, ctx->ro_gpio);
+
+ if (!IS_ERR_OR_NULL(ctx->cd_gpio)) {
+ if (host->slot.cd_irq >= 0) {
+ devm_free_irq(&host->class_dev, host->slot.cd_irq,
host);
+ host->slot.cd_irq = -EINVAL;
+ }
+
+ devm_gpiod_put(&host->class_dev, ctx->cd_gpio);
+ }
+
+ devm_kfree(&host->class_dev, ctx);
+
+ ctx = NULL;
+}
+EXPORT_SYMBOL(mmc_gpiod_free);
+
void mmc_gpio_free_ro(struct mmc_host *host)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
- int gpio;
- if (!ctx || !gpio_is_valid(ctx->ro_gpio))
+ if (!ctx || IS_ERR_OR_NULL(ctx->ro_gpio))
return;
- gpio = ctx->ro_gpio;
- ctx->ro_gpio = -EINVAL;
+ devm_gpiod_put(&host->class_dev, ctx->ro_gpio);
- devm_gpio_free(&host->class_dev, gpio);
+ ctx->ro_gpio = NULL;
}
EXPORT_SYMBOL(mmc_gpio_free_ro);
@@ -239,9 +298,8 @@ EXPORT_SYMBOL(mmc_gpio_free_ro);
void mmc_gpio_free_cd(struct mmc_host *host)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
- int gpio;
- if (!ctx || !gpio_is_valid(ctx->cd_gpio))
+ if (!ctx || IS_ERR_OR_NULL(ctx->cd_gpio))
return;
if (host->slot.cd_irq >= 0) {
@@ -249,9 +307,8 @@ void mmc_gpio_free_cd(struct mmc_host *host)
host->slot.cd_irq = -EINVAL;
}
- gpio = ctx->cd_gpio;
- ctx->cd_gpio = -EINVAL;
+ devm_gpiod_put(&host->class_dev, ctx->cd_gpio);
- devm_gpio_free(&host->class_dev, gpio);
+ ctx->cd_gpio = NULL;
}
EXPORT_SYMBOL(mmc_gpio_free_cd);
diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h
index b0c73e4..a31ed96 100644
--- a/include/linux/mmc/slot-gpio.h
+++ b/include/linux/mmc/slot-gpio.h
@@ -14,10 +14,18 @@
struct mmc_host;
int mmc_gpio_get_ro(struct mmc_host *host);
+#define mmc_gpiod_get_ro(host) mmc_gpio_get_ro(host)
+int mmc_gpiod_request_ro(struct mmc_host *host);
+
+int mmc_gpio_get_cd(struct mmc_host *host);
+#define mmc_gpiod_get_cd(host) mmc_gpio_get_cd(host)
+int mmc_gpiod_request_cd(struct mmc_host *host, unsigned int debounce);
+
+void mmc_gpiod_free(struct mmc_host *host);
+
int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio);
void mmc_gpio_free_ro(struct mmc_host *host);
-int mmc_gpio_get_cd(struct mmc_host *host);
int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
unsigned int debounce);
void mmc_gpio_free_cd(struct mmc_host *host);
--
1.8.3.2
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