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Date: Mon, 15 Jun 2015 00:00:57 +0200
From: Tobias Diedrich <ranma+kernel@...edrich.de>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>,
Linus Walleij <linus.walleij@...aro.org>
Cc: Alexandre Courbot <gnurou@...il.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] gpio / ACPI: Add label to the gpio request
In leds-gpio.c create_gpio_led only the legacy path propagates the label
by passing it into devm_gpio_request_one. Similarily gpio_keys_polled.c
also neglects to propagate the name to the gpio subsystem.
On the newer devicetree/acpi path the label is lost as far as the GPIO
subsystem goes (it is only retained as name in struct gpio_led.
Amend devm_get_gpiod_from_child to take an additonal (optional) label
argument and propagate it so it will show up in /sys/kernel/debug/gpio.
So instead of:
GPIOs 288-511, platform/PRP0001:00, AMD SBX00:
gpio-475 (? ) in hi
gpio-477 (? ) out hi
gpio-478 (? ) out lo
gpio-479 (? ) out hi
we get the much nicer output:
GPIOs 288-511, platform/PRP0001:00, AMD SBX00:
gpio-475 (switch1 ) in hi
gpio-477 (led1 ) out hi
gpio-478 (led2 ) out lo
gpio-479 (led3 ) out hi
Signed-off-by: Tobias Diedrich <ranma+kernel@...edrich.de>
---
drivers/gpio/devres.c | 6 ++++--
drivers/gpio/gpiolib.c | 6 ++++--
drivers/input/keyboard/gpio_keys_polled.c | 9 +++++----
drivers/leds/leds-gpio.c | 20 +++++++++++---------
include/linux/gpio/consumer.h | 6 ++++--
5 files changed, 28 insertions(+), 19 deletions(-)
diff --git a/drivers/gpio/devres.c b/drivers/gpio/devres.c
index 07ba823..40a6089 100644
--- a/drivers/gpio/devres.c
+++ b/drivers/gpio/devres.c
@@ -127,13 +127,15 @@ EXPORT_SYMBOL(__devm_gpiod_get_index);
* @dev: GPIO consumer
* @con_id: function within the GPIO consumer
* @child: firmware node (child of @dev)
+ * @label: a literal description string of this GPIO
*
* GPIO descriptors returned from this function are automatically disposed on
* driver detach.
*/
struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
const char *con_id,
- struct fwnode_handle *child)
+ struct fwnode_handle *child,
+ const char *label)
{
static const char * const suffixes[] = { "gpios", "gpio" };
char prop_name[32]; /* 32 is max size of property name */
@@ -154,7 +156,7 @@ struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
snprintf(prop_name, sizeof(prop_name), "%s",
suffixes[i]);
- desc = fwnode_get_named_gpiod(child, prop_name);
+ desc = fwnode_get_named_gpiod(child, prop_name, label);
if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))
break;
}
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 6bc612b..b3f2e5c 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2017,6 +2017,7 @@ EXPORT_SYMBOL_GPL(__gpiod_get_index);
* fwnode_get_named_gpiod - obtain a GPIO from firmware node
* @fwnode: handle of the firmware node
* @propname: name of the firmware property representing the GPIO
+ * @label: label for the GPIO
*
* This function can be used for drivers that get their configuration
* from firmware.
@@ -2028,7 +2029,8 @@ EXPORT_SYMBOL_GPL(__gpiod_get_index);
* In case of error an ERR_PTR() is returned.
*/
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
- const char *propname)
+ const char *propname,
+ const char *label)
{
struct gpio_desc *desc = ERR_PTR(-ENODEV);
bool active_low = false;
@@ -2056,7 +2058,7 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
if (IS_ERR(desc))
return desc;
- ret = gpiod_request(desc, NULL);
+ ret = gpiod_request(desc, label);
if (ret)
return ERR_PTR(ret);
diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
index 097d721..4cf3d23 100644
--- a/drivers/input/keyboard/gpio_keys_polled.c
+++ b/drivers/input/keyboard/gpio_keys_polled.c
@@ -124,8 +124,12 @@ static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct
device_for_each_child_node(dev, child) {
struct gpio_desc *desc;
+ button = &pdata->buttons[pdata->nbuttons++];
+
+ fwnode_property_read_string(child, "label", &button->desc);
- desc = devm_get_gpiod_from_child(dev, NULL, child);
+ desc = devm_get_gpiod_from_child(dev, NULL, child,
+ button->desc);
if (IS_ERR(desc)) {
error = PTR_ERR(desc);
if (error != -EPROBE_DEFER)
@@ -136,7 +140,6 @@ static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct
return ERR_PTR(error);
}
- button = &pdata->buttons[pdata->nbuttons++];
button->gpiod = desc;
if (fwnode_property_read_u32(child, "linux,code", &button->code)) {
@@ -146,8 +149,6 @@ static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct
return ERR_PTR(-EINVAL);
}
- fwnode_property_read_string(child, "label", &button->desc);
-
if (fwnode_property_read_u32(child, "linux,input-type",
&button->type))
button->type = EV_KEY;
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 15eb3f8..082ad40 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -184,13 +184,6 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
struct gpio_led led = {};
const char *state = NULL;
- led.gpiod = devm_get_gpiod_from_child(dev, NULL, child);
- if (IS_ERR(led.gpiod)) {
- fwnode_handle_put(child);
- ret = PTR_ERR(led.gpiod);
- goto err;
- }
-
np = of_node(child);
if (fwnode_property_present(child, "label")) {
@@ -198,9 +191,18 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
} else {
if (IS_ENABLED(CONFIG_OF) && !led.name && np)
led.name = np->name;
- if (!led.name)
- return ERR_PTR(-EINVAL);
}
+ if (!led.name)
+ return ERR_PTR(-EINVAL);
+
+ led.gpiod = devm_get_gpiod_from_child(dev, NULL, child,
+ led.name);
+ if (IS_ERR(led.gpiod)) {
+ fwnode_handle_put(child);
+ ret = PTR_ERR(led.gpiod);
+ goto err;
+ }
+
fwnode_property_read_string(child, "linux,default-trigger",
&led.default_trigger);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 3a7c9ff..51654cf 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -134,10 +134,12 @@ int desc_to_gpio(const struct gpio_desc *desc);
struct fwnode_handle;
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
- const char *propname);
+ const char *propname,
+ const char *label);
struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
const char *con_id,
- struct fwnode_handle *child);
+ struct fwnode_handle *child,
+ const char *label);
#else /* CONFIG_GPIOLIB */
static inline int gpiod_count(struct device *dev, const char *con_id)
--
2.1.4
--
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