kernel: fix of_node handling in LEDs core code

This backports fixes for setting of_node and making it possible to read
extra info from DT. This was partially fixed by:
[PATCH] leds: leds-gpio: Set of_node for created LED devices
but it didn't work during initialization.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2017-03-08 12:38:43 +01:00
parent 4124847772
commit 318f2d6101
6 changed files with 496 additions and 0 deletions

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@ -0,0 +1,61 @@
From 68620e594c250ba8c43a78e77f5296cb9952582e Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Wed, 14 Sep 2016 20:54:12 +0200
Subject: [PATCH] leds: gpio: introduce gpio_blink_set_t
Introduce a typedef gpio_blink_set_t to improve readability of the code.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
---
drivers/leds/leds-gpio.c | 6 ++----
include/linux/leds.h | 9 ++++++---
2 files changed, 8 insertions(+), 7 deletions(-)
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -29,8 +29,7 @@ struct gpio_led_data {
u8 new_level;
u8 can_sleep;
u8 blinking;
- int (*platform_gpio_blink_set)(struct gpio_desc *desc, int state,
- unsigned long *delay_on, unsigned long *delay_off);
+ gpio_blink_set_t platform_gpio_blink_set;
};
static void gpio_led_work(struct work_struct *work)
@@ -88,8 +87,7 @@ static int gpio_blink_set(struct led_cla
static int create_gpio_led(const struct gpio_led *template,
struct gpio_led_data *led_dat, struct device *parent,
- int (*blink_set)(struct gpio_desc *, int, unsigned long *,
- unsigned long *))
+ gpio_blink_set_t blink_set)
{
int ret, state;
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -330,6 +330,11 @@ struct led_platform_data {
struct led_info *leds;
};
+struct gpio_desc;
+typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state,
+ unsigned long *delay_on,
+ unsigned long *delay_off);
+
/* For the leds-gpio driver */
struct gpio_led {
const char *name;
@@ -352,9 +357,7 @@ struct gpio_led_platform_data {
#define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */
#define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */
#define GPIO_LED_BLINK 2 /* Please, blink */
- int (*gpio_blink_set)(struct gpio_desc *desc, int state,
- unsigned long *delay_on,
- unsigned long *delay_off);
+ gpio_blink_set_t gpio_blink_set;
};
struct platform_device *gpio_led_register_device(

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@ -0,0 +1,75 @@
From bc2c0dd85a0a31505ca2f92bef891ddac9126725 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Wed, 14 Sep 2016 20:55:27 +0200
Subject: [PATCH] leds: gpio: switch to managed version of
led_classdev_register
Using the managed version of led_classdev_register allows to
significantly simplify the code.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
---
drivers/leds/leds-gpio.c | 23 ++---------------------
1 file changed, 2 insertions(+), 21 deletions(-)
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -143,7 +143,7 @@ static int create_gpio_led(const struct
INIT_WORK(&led_dat->work, gpio_led_work);
- return led_classdev_register(parent, &led_dat->cdev);
+ return devm_led_classdev_register(parent, &led_dat->cdev);
}
static void delete_gpio_led(struct gpio_led_data *led)
@@ -231,8 +231,6 @@ static struct gpio_leds_priv *gpio_leds_
return priv;
err:
- for (count = priv->num_leds - 1; count >= 0; count--)
- delete_gpio_led(&priv->leds[count]);
return ERR_PTR(ret);
}
@@ -261,12 +259,8 @@ static int gpio_led_probe(struct platfor
ret = create_gpio_led(&pdata->leds[i],
&priv->leds[i],
&pdev->dev, pdata->gpio_blink_set);
- if (ret < 0) {
- /* On failure: unwind the led creations */
- for (i = i - 1; i >= 0; i--)
- delete_gpio_led(&priv->leds[i]);
+ if (ret < 0)
return ret;
- }
}
} else {
priv = gpio_leds_create(pdev);
@@ -279,17 +273,6 @@ static int gpio_led_probe(struct platfor
return 0;
}
-static int gpio_led_remove(struct platform_device *pdev)
-{
- struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
- int i;
-
- for (i = 0; i < priv->num_leds; i++)
- delete_gpio_led(&priv->leds[i]);
-
- return 0;
-}
-
static void gpio_led_shutdown(struct platform_device *pdev)
{
struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
@@ -304,7 +287,6 @@ static void gpio_led_shutdown(struct pla
static struct platform_driver gpio_led_driver = {
.probe = gpio_led_probe,
- .remove = gpio_led_remove,
.shutdown = gpio_led_shutdown,
.driver = {
.name = "leds-gpio",

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@ -0,0 +1,120 @@
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Mon, 6 Mar 2017 06:19:44 +0100
Subject: [PATCH] leds: core: add OF variants of LED registering functions
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
These new functions allow passing an additional device_node argument
that will be internally set for created LED device. Thanks to this LED
core code and triggers will be able to access DT node for reading extra
info.
The easiest solution for achieving this was reworking old functions to
more generic ones & adding simple defines for API compatibility.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
---
drivers/leds/led-class.c | 26 ++++++++++++++++----------
include/linux/leds.h | 14 ++++++++++----
2 files changed, 26 insertions(+), 14 deletions(-)
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -181,11 +181,14 @@ static int led_classdev_next_name(const
}
/**
- * led_classdev_register - register a new object of led_classdev class.
- * @parent: The device to register.
+ * of_led_classdev_register - register a new object of led_classdev class.
+ *
+ * @parent: parent of LED device
* @led_cdev: the led_classdev structure for this device.
+ * @np: DT node describing this LED
*/
-int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
+int of_led_classdev_register(struct device *parent, struct device_node *np,
+ struct led_classdev *led_cdev)
{
char name[64];
int ret;
@@ -198,6 +201,7 @@ int led_classdev_register(struct device
led_cdev, led_cdev->groups, "%s", name);
if (IS_ERR(led_cdev->dev))
return PTR_ERR(led_cdev->dev);
+ led_cdev->dev->of_node = np;
if (ret)
dev_warn(parent, "Led %s renamed to %s due to name collision",
@@ -230,7 +234,7 @@ int led_classdev_register(struct device
return 0;
}
-EXPORT_SYMBOL_GPL(led_classdev_register);
+EXPORT_SYMBOL_GPL(of_led_classdev_register);
/**
* led_classdev_unregister - unregisters a object of led_properties class.
@@ -269,12 +273,14 @@ static void devm_led_classdev_release(st
}
/**
- * devm_led_classdev_register - resource managed led_classdev_register()
- * @parent: The device to register.
+ * devm_of_led_classdev_register - resource managed led_classdev_register()
+ *
+ * @parent: parent of LED device
* @led_cdev: the led_classdev structure for this device.
*/
-int devm_led_classdev_register(struct device *parent,
- struct led_classdev *led_cdev)
+int devm_of_led_classdev_register(struct device *parent,
+ struct device_node *np,
+ struct led_classdev *led_cdev)
{
struct led_classdev **dr;
int rc;
@@ -283,7 +289,7 @@ int devm_led_classdev_register(struct de
if (!dr)
return -ENOMEM;
- rc = led_classdev_register(parent, led_cdev);
+ rc = of_led_classdev_register(parent, np, led_cdev);
if (rc) {
devres_free(dr);
return rc;
@@ -294,7 +300,7 @@ int devm_led_classdev_register(struct de
return 0;
}
-EXPORT_SYMBOL_GPL(devm_led_classdev_register);
+EXPORT_SYMBOL_GPL(devm_of_led_classdev_register);
static int devm_led_classdev_match(struct device *dev, void *res, void *data)
{
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -103,10 +103,16 @@ struct led_classdev {
struct mutex led_access;
};
-extern int led_classdev_register(struct device *parent,
- struct led_classdev *led_cdev);
-extern int devm_led_classdev_register(struct device *parent,
- struct led_classdev *led_cdev);
+extern int of_led_classdev_register(struct device *parent,
+ struct device_node *np,
+ struct led_classdev *led_cdev);
+#define led_classdev_register(parent, led_cdev) \
+ of_led_classdev_register(parent, NULL, led_cdev)
+extern int devm_of_led_classdev_register(struct device *parent,
+ struct device_node *np,
+ struct led_classdev *led_cdev);
+#define devm_led_classdev_register(parent, led_cdev) \
+ devm_of_led_classdev_register(parent, NULL, led_cdev)
extern void led_classdev_unregister(struct led_classdev *led_cdev);
extern void devm_led_classdev_unregister(struct device *parent,
struct led_classdev *led_cdev);

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@ -0,0 +1,60 @@
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Mon, 6 Mar 2017 06:19:45 +0100
Subject: [PATCH] leds: gpio: use OF variant of LED registering function
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
In leds-gpio we support LEDs specified in DT so we should use
(devm_)of_led_classdev_register. This allows passing DT node as argument
for use by the LED subsystem.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
---
drivers/leds/leds-gpio.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -87,7 +87,7 @@ static int gpio_blink_set(struct led_cla
static int create_gpio_led(const struct gpio_led *template,
struct gpio_led_data *led_dat, struct device *parent,
- gpio_blink_set_t blink_set)
+ struct device_node *np, gpio_blink_set_t blink_set)
{
int ret, state;
@@ -143,7 +143,7 @@ static int create_gpio_led(const struct
INIT_WORK(&led_dat->work, gpio_led_work);
- return devm_led_classdev_register(parent, &led_dat->cdev);
+ return devm_of_led_classdev_register(parent, np, &led_dat->cdev);
}
static void delete_gpio_led(struct gpio_led_data *led)
@@ -219,7 +219,7 @@ static struct gpio_leds_priv *gpio_leds_
if (fwnode_property_present(child, "retain-state-suspended"))
led.retain_state_suspended = 1;
- ret = create_gpio_led(&led, led_dat, dev, NULL);
+ ret = create_gpio_led(&led, led_dat, dev, np, NULL);
if (ret < 0) {
fwnode_handle_put(child);
goto err;
@@ -256,9 +256,9 @@ static int gpio_led_probe(struct platfor
priv->num_leds = pdata->num_leds;
for (i = 0; i < priv->num_leds; i++) {
- ret = create_gpio_led(&pdata->leds[i],
- &priv->leds[i],
- &pdev->dev, pdata->gpio_blink_set);
+ ret = create_gpio_led(&pdata->leds[i], &priv->leds[i],
+ &pdev->dev, NULL,
+ pdata->gpio_blink_set);
if (ret < 0)
return ret;
}

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@ -0,0 +1,120 @@
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Mon, 6 Mar 2017 06:19:44 +0100
Subject: [PATCH] leds: core: add OF variants of LED registering functions
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
These new functions allow passing an additional device_node argument
that will be internally set for created LED device. Thanks to this LED
core code and triggers will be able to access DT node for reading extra
info.
The easiest solution for achieving this was reworking old functions to
more generic ones & adding simple defines for API compatibility.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
---
drivers/leds/led-class.c | 26 ++++++++++++++++----------
include/linux/leds.h | 14 ++++++++++----
2 files changed, 26 insertions(+), 14 deletions(-)
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -181,11 +181,14 @@ static int led_classdev_next_name(const
}
/**
- * led_classdev_register - register a new object of led_classdev class.
- * @parent: The device to register.
+ * of_led_classdev_register - register a new object of led_classdev class.
+ *
+ * @parent: parent of LED device
* @led_cdev: the led_classdev structure for this device.
+ * @np: DT node describing this LED
*/
-int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
+int of_led_classdev_register(struct device *parent, struct device_node *np,
+ struct led_classdev *led_cdev)
{
char name[64];
int ret;
@@ -198,6 +201,7 @@ int led_classdev_register(struct device
led_cdev, led_cdev->groups, "%s", name);
if (IS_ERR(led_cdev->dev))
return PTR_ERR(led_cdev->dev);
+ led_cdev->dev->of_node = np;
if (ret)
dev_warn(parent, "Led %s renamed to %s due to name collision",
@@ -228,7 +232,7 @@ int led_classdev_register(struct device
return 0;
}
-EXPORT_SYMBOL_GPL(led_classdev_register);
+EXPORT_SYMBOL_GPL(of_led_classdev_register);
/**
* led_classdev_unregister - unregisters a object of led_properties class.
@@ -270,12 +274,14 @@ static void devm_led_classdev_release(st
}
/**
- * devm_led_classdev_register - resource managed led_classdev_register()
- * @parent: The device to register.
+ * devm_of_led_classdev_register - resource managed led_classdev_register()
+ *
+ * @parent: parent of LED device
* @led_cdev: the led_classdev structure for this device.
*/
-int devm_led_classdev_register(struct device *parent,
- struct led_classdev *led_cdev)
+int devm_of_led_classdev_register(struct device *parent,
+ struct device_node *np,
+ struct led_classdev *led_cdev)
{
struct led_classdev **dr;
int rc;
@@ -284,7 +290,7 @@ int devm_led_classdev_register(struct de
if (!dr)
return -ENOMEM;
- rc = led_classdev_register(parent, led_cdev);
+ rc = of_led_classdev_register(parent, np, led_cdev);
if (rc) {
devres_free(dr);
return rc;
@@ -295,7 +301,7 @@ int devm_led_classdev_register(struct de
return 0;
}
-EXPORT_SYMBOL_GPL(devm_led_classdev_register);
+EXPORT_SYMBOL_GPL(devm_of_led_classdev_register);
static int devm_led_classdev_match(struct device *dev, void *res, void *data)
{
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -109,10 +109,16 @@ struct led_classdev {
struct mutex led_access;
};
-extern int led_classdev_register(struct device *parent,
- struct led_classdev *led_cdev);
-extern int devm_led_classdev_register(struct device *parent,
- struct led_classdev *led_cdev);
+extern int of_led_classdev_register(struct device *parent,
+ struct device_node *np,
+ struct led_classdev *led_cdev);
+#define led_classdev_register(parent, led_cdev) \
+ of_led_classdev_register(parent, NULL, led_cdev)
+extern int devm_of_led_classdev_register(struct device *parent,
+ struct device_node *np,
+ struct led_classdev *led_cdev);
+#define devm_led_classdev_register(parent, led_cdev) \
+ devm_of_led_classdev_register(parent, NULL, led_cdev)
extern void led_classdev_unregister(struct led_classdev *led_cdev);
extern void devm_led_classdev_unregister(struct device *parent,
struct led_classdev *led_cdev);

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@ -0,0 +1,60 @@
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Mon, 6 Mar 2017 06:19:45 +0100
Subject: [PATCH] leds: gpio: use OF variant of LED registering function
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
In leds-gpio we support LEDs specified in DT so we should use
(devm_)of_led_classdev_register. This allows passing DT node as argument
for use by the LED subsystem.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
---
drivers/leds/leds-gpio.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -77,7 +77,7 @@ static int gpio_blink_set(struct led_cla
static int create_gpio_led(const struct gpio_led *template,
struct gpio_led_data *led_dat, struct device *parent,
- gpio_blink_set_t blink_set)
+ struct device_node *np, gpio_blink_set_t blink_set)
{
int ret, state;
@@ -139,7 +139,7 @@ static int create_gpio_led(const struct
if (ret < 0)
return ret;
- return devm_led_classdev_register(parent, &led_dat->cdev);
+ return devm_of_led_classdev_register(parent, np, &led_dat->cdev);
}
struct gpio_leds_priv {
@@ -206,7 +206,7 @@ static struct gpio_leds_priv *gpio_leds_
if (fwnode_property_present(child, "panic-indicator"))
led.panic_indicator = 1;
- ret = create_gpio_led(&led, led_dat, dev, NULL);
+ ret = create_gpio_led(&led, led_dat, dev, np, NULL);
if (ret < 0) {
fwnode_handle_put(child);
return ERR_PTR(ret);
@@ -240,9 +240,9 @@ static int gpio_led_probe(struct platfor
priv->num_leds = pdata->num_leds;
for (i = 0; i < priv->num_leds; i++) {
- ret = create_gpio_led(&pdata->leds[i],
- &priv->leds[i],
- &pdev->dev, pdata->gpio_blink_set);
+ ret = create_gpio_led(&pdata->leds[i], &priv->leds[i],
+ &pdev->dev, NULL,
+ pdata->gpio_blink_set);
if (ret < 0)
return ret;
}