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leds: class: Improve LED and LED flash class registration API 

Replace of_led_classdev_register() with led_classdev_register_ext(), which
accepts easily extendable struct led_init_data, instead of the fixed
struct device_node argument. The latter can be now passed in an fwnode
property of the struct led_init_data.

The modification is driven by the need for passing additional arguments
required for the forthcoming generic mechanism for composing LED names.
Currently the LED name is conveyed in the "name" char pointer property of
the struct led_classdev. This is redundant since LED class device name
is accessible throughout the whole LED class device life time via
associated struct device's kobj->name property.

The change will not break any existing clients since the patch alters
also existing led_classdev{_flash}_register() macro wrappers, that pass
NULL in place of init_data, which leads to using legacy name
initialization path basing on the struct led_classdev's "name" property.

Three existing users of devm_of_led_classdev_registers() are modified
to use devm_led_classdev_register(), which will not impact their
operation since they in fact didn't need to pass struct device_node on
registration from the beginning.

Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Cc: Baolin Wang <baolin.wang@linaro.org>
Cc: Dan Murphy <dmurphy@ti.com>
Cc: Daniel Mack <daniel@zonque.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Oleh Kravchenko <oleg@kaa.org.ua>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Simon Shields <simon@lineageos.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Jacek Anaszewski 2019-06-09 20:19:03 +02:00
parent 7d9d60bdfa
commit b2b998c0f9
8 changed files with 60 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/leds/led-class-flash.c
View File

@ -282,8 +282,9 @@ static void led_flash_init_sysfs_groups(struct led_classdev_flash *fled_cdev)
led_cdev->groups = flash_groups;
}
int led_classdev_flash_register(struct device *parent,
struct led_classdev_flash *fled_cdev)
int led_classdev_flash_register_ext(struct device *parent,
struct led_classdev_flash *fled_cdev,
struct led_init_data *init_data)
{
struct led_classdev *led_cdev;
const struct led_flash_ops *ops;
@ -309,13 +310,13 @@ int led_classdev_flash_register(struct device *parent,
}
/* Register led class device */
ret = led_classdev_register(parent, led_cdev);
ret = led_classdev_register_ext(parent, led_cdev, init_data);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(led_classdev_flash_register);
EXPORT_SYMBOL_GPL(led_classdev_flash_register_ext);
void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev)
{

29
drivers/leds/led-class.c
View File

@ -14,6 +14,7 @@
#include <linux/leds.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
@ -242,14 +243,16 @@ static int led_classdev_next_name(const char *init_name, char *name,
}
/**
* of_led_classdev_register - register a new object of led_classdev class.
* led_classdev_register_ext - register a new object of led_classdev class
* with init data.
*
* @parent: parent of LED device
* @led_cdev: the led_classdev structure for this device.
* @np: DT node describing this LED
* @init_data: LED class device initialization data
*/
int of_led_classdev_register(struct device *parent, struct device_node *np,
struct led_classdev *led_cdev)
int led_classdev_register_ext(struct device *parent,
struct led_classdev *led_cdev,
struct led_init_data *init_data)
{
char name[LED_MAX_NAME_SIZE];
int ret;
@ -266,7 +269,8 @@ int of_led_classdev_register(struct device *parent, struct device_node *np,
mutex_unlock(&led_cdev->led_access);
return PTR_ERR(led_cdev->dev);
}
led_cdev->dev->of_node = np;
if (init_data && init_data->fwnode)
led_cdev->dev->of_node = to_of_node(init_data->fwnode);
if (ret)
dev_warn(parent, "Led %s renamed to %s due to name collision",
@ -311,7 +315,7 @@ int of_led_classdev_register(struct device *parent, struct device_node *np,
return 0;
}
EXPORT_SYMBOL_GPL(of_led_classdev_register);
EXPORT_SYMBOL_GPL(led_classdev_register_ext);
/**
* led_classdev_unregister - unregisters a object of led_properties class.
@ -356,14 +360,15 @@ static void devm_led_classdev_release(struct device *dev, void *res)
}
/**
* devm_of_led_classdev_register - resource managed led_classdev_register()
* devm_led_classdev_register_ext - resource managed led_classdev_register_ext()
*
* @parent: parent of LED device
* @led_cdev: the led_classdev structure for this device.
* @init_data: LED class device initialization data
*/
int devm_of_led_classdev_register(struct device *parent,
struct device_node *np,
struct led_classdev *led_cdev)
int devm_led_classdev_register_ext(struct device *parent,
struct led_classdev *led_cdev,
struct led_init_data *init_data)
{
struct led_classdev **dr;
int rc;
@ -372,7 +377,7 @@ int devm_of_led_classdev_register(struct device *parent,
if (!dr)
return -ENOMEM;
rc = of_led_classdev_register(parent, np, led_cdev);
rc = led_classdev_register_ext(parent, led_cdev, init_data);
if (rc) {
devres_free(dr);
return rc;
@ -383,7 +388,7 @@ int devm_of_led_classdev_register(struct device *parent,
return 0;
}
EXPORT_SYMBOL_GPL(devm_of_led_classdev_register);
EXPORT_SYMBOL_GPL(devm_led_classdev_register_ext);
static int devm_led_classdev_match(struct device *dev, void *res, void *data)
{

3
drivers/leds/leds-cr0014114.c
View File

@ -207,8 +207,7 @@ static int cr0014114_probe_dt(struct cr0014114 *priv)
led->ldev.max_brightness = CR_MAX_BRIGHTNESS;
led->ldev.brightness_set_blocking = cr0014114_set_sync;
ret = devm_of_led_classdev_register(priv->dev, np,
&led->ldev);
ret = devm_led_classdev_register(priv->dev, &led->ldev);
if (ret) {
dev_err(priv->dev,
"failed to register LED device %s, err %d",

2
drivers/leds/leds-gpio.c
View File

@ -108,7 +108,7 @@ static int create_gpio_led(const struct gpio_led *template,
if (ret < 0)
return ret;
return devm_of_led_classdev_register(parent, np, &led_dat->cdev);
return devm_led_classdev_register(parent, &led_dat->cdev);
}
struct gpio_leds_priv {

2
drivers/leds/leds-max77650.c
View File

@ -118,7 +118,7 @@ static int max77650_led_probe(struct platform_device *pdev)
of_property_read_string(child, "linux,default-trigger",
&led->cdev.default_trigger);
rv = devm_of_led_classdev_register(dev, child, &led->cdev);
rv = devm_led_classdev_register(dev, &led->cdev);
if (rv)
goto err_node_put;

3
drivers/leds/leds-pwm.c
View File

@ -111,8 +111,7 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
if (!led_data->period && (led->pwm_period_ns > 0))
led_data->period = led->pwm_period_ns;
ret = devm_of_led_classdev_register(dev, to_of_node(fwnode),
&led_data->cdev);
ret = devm_led_classdev_register(dev, &led_data->cdev);
if (ret == 0) {
priv->num_leds++;
led_pwm_set(&led_data->cdev, led_data->cdev.brightness);

15
include/linux/led-class-flash.h
View File

@ -86,15 +86,20 @@ static inline struct led_classdev_flash *lcdev_to_flcdev(
}
/**
* led_classdev_flash_register - register a new object of led_classdev class
* with support for flash LEDs
* @parent: the flash LED to register
* led_classdev_flash_register_ext - register a new object of LED class with
* init data and with support for flash LEDs
* @parent: LED flash controller device this flash LED is driven by
* @fled_cdev: the led_classdev_flash structure for this device
* @init_data: the LED class flash device initialization data
*
* Returns: 0 on success or negative error value on failure
*/
extern int led_classdev_flash_register(struct device *parent,
struct led_classdev_flash *fled_cdev);
extern int led_classdev_flash_register_ext(struct device *parent,
struct led_classdev_flash *fled_cdev,
struct led_init_data *init_data);
#define led_classdev_flash_register(parent, fled_cdev) \
led_classdev_flash_register_ext(parent, fled_cdev, NULL)
/**
* led_classdev_flash_unregister - unregisters an object of led_classdev class

30
include/linux/leds.h
View File

@ -30,6 +30,11 @@ enum led_brightness {
LED_FULL = 255,
};
struct led_init_data {
/* device fwnode handle */
struct fwnode_handle *fwnode;
};
struct led_classdev {
const char *name;
enum led_brightness brightness;
@ -125,16 +130,25 @@ struct led_classdev {
struct mutex led_access;
};
extern int of_led_classdev_register(struct device *parent,
struct device_node *np,
struct led_classdev *led_cdev);
/**
* led_classdev_register_ext - register a new object of LED class with
* init data
* @parent: LED controller device this LED is driven by
* @led_cdev: the led_classdev structure for this device
* @init_data: the LED class device initialization data
*
* Returns: 0 on success or negative error value on failure
*/
extern int led_classdev_register_ext(struct device *parent,
struct led_classdev *led_cdev,
struct led_init_data *init_data);
#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);
led_classdev_register_ext(parent, led_cdev, NULL)
extern int devm_led_classdev_register_ext(struct device *parent,
struct led_classdev *led_cdev,
struct led_init_data *init_data);
#define devm_led_classdev_register(parent, led_cdev) \
devm_of_led_classdev_register(parent, NULL, led_cdev)
devm_led_classdev_register_ext(parent, led_cdev, NULL)
extern void led_classdev_unregister(struct led_classdev *led_cdev);
extern void devm_led_classdev_unregister(struct device *parent,
struct led_classdev *led_cdev);