Please note that I submitted a patch on 02/07/14 to create this
function which was acked by Linus Walleij on 05/07/14.
Great minds think alike, and all that.
However, I think that the version I submitted better replicates the
original (non devm) functionality, see below.
I didn't, however, add it to the documentation. +1 on that.
On 06/07/14 18:47, Himangi Saraogi wrote:
This patch introduces the function devm_request_gpio_array that
allocates multiple GPIOs in a single call in a managed manner. The
function is also included in the documentation and a declaration is
added in include/linux/gpio.h.
Signed-off-by: Himangi Saraogi <himangi774@xxxxxxxxx>
---
Documentation/driver-model/devres.txt | 1 +
drivers/gpio/devres.c | 21 +++++++++++++++++++++
include/linux/gpio.h | 2 ++
3 files changed, 24 insertions(+)
diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index 9e2098e..756f6cf 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -337,6 +337,7 @@ GPIO
devm_gpiod_put()
devm_gpio_request()
devm_gpio_request_one()
+ devm_gpio_request_array()
devm_gpio_free()
SND
diff --git a/drivers/gpio/devres.c b/drivers/gpio/devres.c
index 65978cf..adae7fa 100644
--- a/drivers/gpio/devres.c
+++ b/drivers/gpio/devres.c
@@ -229,6 +229,27 @@ int devm_gpio_request_one(struct device *dev, unsigned gpio,
EXPORT_SYMBOL(devm_gpio_request_one);
/**
+ * devm_gpio_request_array - request multiple GPIOs in a single call
+ * @dev: device to request for
+ * @array: array of the 'struct gpio'
+ * @num: how many GPIOs in the array
+ */
+int devm_gpio_request_array(struct device *dev, const struct gpio *array,
+ size_t num)
+{
+ int i, err;
+
+ for (i = 0; i < num; i++, array++) {
+ err = devm_gpio_request_one(dev, array->gpio, array->flags,
+ array->label);
+ if (err)
+ return err;
The failure path in the version I submitted frees up any already
allocated gpios on the first failure.
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_gpio_request_array);
+
+/**
* devm_gpio_free - free a GPIO
* @dev: device to free GPIO for
* @gpio: GPIO to free
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 85aa5d0..c85f243 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -84,6 +84,8 @@ struct device;
int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
int devm_gpio_request_one(struct device *dev, unsigned gpio,
unsigned long flags, const char *label);
+int devm_gpio_request_array(struct device *dev, const struct gpio *array,
+ size_t num);
void devm_gpio_free(struct device *dev, unsigned int gpio);
#else /* ! CONFIG_GPIOLIB */
--
Rob Jones
Codethink Ltd
mailto:rob.jones@xxxxxxxxxxxxxxx
tel:+44 161 236 5575
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