Implement a function to translate a gpio name to a descriptor.
Signed-off-by: Markus Pargmann <[email protected]>
---
drivers/gpio/gpiolib.c | 32 ++++++++++++++++++++++++++++++++
include/linux/gpio/consumer.h | 7 +++++++
2 files changed, 39 insertions(+)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 9f402b159cbe..dcac3bcf21dd 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -90,6 +90,38 @@ struct gpio_desc *gpio_to_desc(unsigned gpio)
EXPORT_SYMBOL_GPL(gpio_to_desc);
/**
+ * Convert a GPIO name to its descriptor
+ */
+struct gpio_desc *gpio_name_to_desc(const char *name)
+{
+ struct gpio_chip *chip;
+ unsigned long flags;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ list_for_each_entry(chip, &gpio_chips, list) {
+ int i;
+
+ for (i = 0; i != chip->ngpio; ++i) {
+ struct gpio_desc *gpio = &chip->desc[i];
+
+ if (!gpio->name)
+ continue;
+
+ if (!strcmp(gpio->name, name)) {
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ return gpio;
+ }
+ }
+ }
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(gpio_name_to_desc);
+
+/**
* Get the GPIO descriptor corresponding to the given hw number for this chip.
*/
struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index adac255aee86..a873b8b47ab3 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -130,6 +130,7 @@ int gpiod_to_irq(const struct gpio_desc *desc);
/* Convert between the old gpio_ and new gpiod_ interfaces */
struct gpio_desc *gpio_to_desc(unsigned gpio);
int desc_to_gpio(const struct gpio_desc *desc);
+struct gpio_desc *gpio_name_to_desc(const char *name);
/* Child properties interface */
struct fwnode_handle;
@@ -400,6 +401,12 @@ static inline struct gpio_desc *gpio_to_desc(unsigned gpio)
{
return ERR_PTR(-EINVAL);
}
+
+static inline struct gpio_desc *gpio_name_to_desc(const char *name)
+{
+ return ERR_PTR(-EINVAL);
+}
+
static inline int desc_to_gpio(const struct gpio_desc *desc)
{
/* GPIO can never have been requested */
--
2.1.4
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