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Date: Wed, 7 Nov 2018 14:55:27 +0800
From: Baolin Wang <baolin.wang@...aro.org>
To: Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc: Linux LED Subsystem <linux-leds@...r.kernel.org>,
DTML <devicetree@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
Rob Herring <robh@...nel.org>, Daniel Mack <daniel@...que.org>,
Dan Murphy <dmurphy@...com>,
Linus Walleij <linus.walleij@...aro.org>,
Oleh Kravchenko <oleg@....org.ua>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Simon Shields <simon@...eageos.org>,
Xiaotong Lu <xiaotong.lu@...eadtrum.com>
Subject: Re: [PATCH 01/24] leds: class: Improve LED and LED flash class
registration API
Hi Jacek,
On 7 November 2018 at 06:07, Jacek Anaszewski
<jacek.anaszewski@...il.com> wrote:
> 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 a fwnode
> property of the struct led_init_data.
>
> The modification is driven by the need for passing another argument
> to the LED class initialization function - a LED class device name.
> Currently it is conveyed in the "name" char pointer property of
> struct led_classdev, which is semantically and functionally incorrect
> since it is needed only on LED class device registration, but persists
> in system memory throughout the whole LED class device lifetime.
>
> Whereas in case of the name strings coming from DT "label" property or
> statically initialized ones the cost is only the pointer size, it grows
> to LED_MAX_NAME_SIZE (64) with the advent of a new LED class device naming
> scheme, where color and function properties come from separate board
> firmware properties and the name needs to be constructed in a new buffer.
>
> 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.
>
> Two 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@...il.com>
> Cc: Baolin Wang <baolin.wang@...aro.org>
> Cc: Daniel Mack <daniel@...que.org>
> Cc: Dan Murphy <dmurphy@...com>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Oleh Kravchenko <oleg@....org.ua>
> Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
> Cc: Simon Shields <simon@...eageos.org>
> Cc: Xiaotong Lu <xiaotong.lu@...eadtrum.com>
> ---
> drivers/leds/led-class-flash.c | 9 +++++----
> drivers/leds/led-class.c | 34 ++++++++++++++++++++++------------
> drivers/leds/leds-cr0014114.c | 3 +--
> drivers/leds/leds-gpio.c | 2 +-
> include/linux/led-class-flash.h | 13 +++++++++----
> include/linux/leds.h | 29 +++++++++++++++++++----------
> 6 files changed, 57 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/leds/led-class-flash.c b/drivers/leds/led-class-flash.c
> index cf39827..8d1c117 100644
> --- a/drivers/leds/led-class-flash.c
> +++ b/drivers/leds/led-class-flash.c
> @@ -285,8 +285,9 @@ 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;
> @@ -312,13 +313,13 @@ 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)
> {
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 3c7e348..8c80763 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -17,6 +17,7 @@
> #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>
> @@ -244,18 +245,25 @@ 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.
> *
> * @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;
>
> + if (init_data && init_data->name) {
> + led_cdev->name = init_data->name;
> + } else {
> + dev_info(parent, "init_data not available");
> + }
> +
> ret = led_classdev_next_name(led_cdev->name, name, sizeof(name));
> if (ret < 0)
> return ret;
> @@ -268,7 +276,8 @@ 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",
> @@ -313,7 +322,7 @@ 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.
> @@ -358,14 +367,15 @@ 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;
> @@ -374,7 +384,7 @@ 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;
> @@ -385,7 +395,7 @@ 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)
> {
> diff --git a/drivers/leds/leds-cr0014114.c b/drivers/leds/leds-cr0014114.c
> index 0e42624..1c82152 100644
> --- a/drivers/leds/leds-cr0014114.c
> +++ b/drivers/leds/leds-cr0014114.c
> @@ -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",
> diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
> index 32fa752..c87fbd3 100644
> --- a/drivers/leds/leds-gpio.c
> +++ b/drivers/leds/leds-gpio.c
> @@ -112,7 +112,7 @@ 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 {
> diff --git a/include/linux/led-class-flash.h b/include/linux/led-class-flash.h
> index 700efaa..28a73d0 100644
> --- a/include/linux/led-class-flash.h
> +++ b/include/linux/led-class-flash.h
> @@ -90,15 +90,20 @@ 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
> + * fwnode_led_classdev_flash_register - register a new object of led_classdev
s/fwnode_led_classdev_flash_register/led_classdev_flash_register_ext
> + * class with support for flash LEDs
> * @parent: the flash LED to register
> + * @fwnode: the flash LED fwnode handle
s/fwnode/init_data
> * @fled_cdev: the led_classdev_flash structure for this device
> *
> * 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
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index 834683d..646c49a 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -20,6 +20,7 @@
> #include <linux/spinlock.h>
> #include <linux/timer.h>
> #include <linux/workqueue.h>
> +#include <uapi/linux/uleds.h>
>
> struct device;
> /*
> @@ -33,6 +34,13 @@ enum led_brightness {
> LED_FULL = 255,
> };
>
> +struct led_init_data {
> + /* Device fwnode handle */
> + struct fwnode_handle *fwnode;
> + /* Requested LED class device name */
> + char name[LED_MAX_NAME_SIZE];
> +};
> +
> struct led_classdev {
> const char *name;
> enum led_brightness brightness;
> @@ -73,6 +81,7 @@ struct led_classdev {
> */
> int (*brightness_set_blocking)(struct led_classdev *led_cdev,
> enum led_brightness brightness);
> +
Unrelated change.
> /* Get LED brightness level */
> enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
>
> @@ -123,16 +132,16 @@ 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);
> -#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 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) \
> + 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_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);
> --
> 2.1.4
>
It can work well for SC27XX LED, FWIW you can add my tested tag.
Tested-by: Baolin Wang <baolin.wang@...aro.org>
--
Baolin Wang
Best Regards
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