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Date: Mon, 20 Jul 2020 13:20:27 +0200
From: Pavel Machek <pavel@....cz>
To: Marek Behún <marek.behun@....cz>
Cc: linux-leds@...r.kernel.org, jacek.anaszewski@...il.com,
Dan Murphy <dmurphy@...com>,
Ondřej Jirman <megous@...ous.com>,
netdev@...r.kernel.org, Russell King <linux@...linux.org.uk>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Gregory Clement <gregory.clement@...tlin.com>,
Andrew Lunn <andrew@...n.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC leds + net-next 1/3] leds: trigger: add support for
LED-private device triggers
Hi!
> Some LED controllers may come with an internal HW triggering mechanism
> for the LED and the ability to switch between SW control and the
> internal HW control. This includes most PHYs, various ethernet switches,
> the Turris Omnia LED controller or AXP20X PMIC.
>
> This adds support for registering such triggers.
>
> This code is based on work by Pavel Machek <pavel@....cz> and
> Ondřej Jirman <megous@...ous.com>.
>
> Signed-off-by: Marek Behún <marek.behun@....cz>
Looks good to me. I'll likely apply it soon...
Best regards,
Pavel
> ---
> drivers/leds/led-triggers.c | 26 ++++++++++++++++++++------
> include/linux/leds.h | 10 ++++++++++
> 2 files changed, 30 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
> index 79e30d2cb7a5..81e758d5a048 100644
> --- a/drivers/leds/led-triggers.c
> +++ b/drivers/leds/led-triggers.c
> @@ -27,6 +27,12 @@ LIST_HEAD(trigger_list);
>
> /* Used by LED Class */
>
> +static inline bool
> +trigger_relevant(struct led_classdev *led_cdev, struct led_trigger *trig)
> +{
> + return !trig->trigger_type || trig->trigger_type == led_cdev->trigger_type;
> +}
> +
> ssize_t led_trigger_write(struct file *filp, struct kobject *kobj,
> struct bin_attribute *bin_attr, char *buf,
> loff_t pos, size_t count)
> @@ -50,7 +56,7 @@ ssize_t led_trigger_write(struct file *filp, struct kobject *kobj,
>
> down_read(&triggers_list_lock);
> list_for_each_entry(trig, &trigger_list, next_trig) {
> - if (sysfs_streq(buf, trig->name)) {
> + if (sysfs_streq(buf, trig->name) && trigger_relevant(led_cdev, trig)) {
> down_write(&led_cdev->trigger_lock);
> led_trigger_set(led_cdev, trig);
> up_write(&led_cdev->trigger_lock);
> @@ -93,8 +99,12 @@ static int led_trigger_format(char *buf, size_t size,
> led_cdev->trigger ? "none" : "[none]");
>
> list_for_each_entry(trig, &trigger_list, next_trig) {
> - bool hit = led_cdev->trigger &&
> - !strcmp(led_cdev->trigger->name, trig->name);
> + bool hit;
> +
> + if (!trigger_relevant(led_cdev, trig))
> + continue;
> +
> + hit = led_cdev->trigger && !strcmp(led_cdev->trigger->name, trig->name);
>
> len += led_trigger_snprintf(buf + len, size - len,
> " %s%s%s", hit ? "[" : "",
> @@ -243,7 +253,8 @@ void led_trigger_set_default(struct led_classdev *led_cdev)
> down_read(&triggers_list_lock);
> down_write(&led_cdev->trigger_lock);
> list_for_each_entry(trig, &trigger_list, next_trig) {
> - if (!strcmp(led_cdev->default_trigger, trig->name)) {
> + if (!strcmp(led_cdev->default_trigger, trig->name) &&
> + trigger_relevant(led_cdev, trig)) {
> led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER;
> led_trigger_set(led_cdev, trig);
> break;
> @@ -280,7 +291,9 @@ int led_trigger_register(struct led_trigger *trig)
> down_write(&triggers_list_lock);
> /* Make sure the trigger's name isn't already in use */
> list_for_each_entry(_trig, &trigger_list, next_trig) {
> - if (!strcmp(_trig->name, trig->name)) {
> + if (!strcmp(_trig->name, trig->name) &&
> + (trig->trigger_type == _trig->trigger_type ||
> + !trig->trigger_type || !_trig->trigger_type)) {
> up_write(&triggers_list_lock);
> return -EEXIST;
> }
> @@ -294,7 +307,8 @@ int led_trigger_register(struct led_trigger *trig)
> list_for_each_entry(led_cdev, &leds_list, node) {
> down_write(&led_cdev->trigger_lock);
> if (!led_cdev->trigger && led_cdev->default_trigger &&
> - !strcmp(led_cdev->default_trigger, trig->name)) {
> + !strcmp(led_cdev->default_trigger, trig->name) &&
> + trigger_relevant(led_cdev, trig)) {
> led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER;
> led_trigger_set(led_cdev, trig);
> }
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index 2451962d1ec5..6a8d6409c993 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -57,6 +57,10 @@ struct led_init_data {
> bool devname_mandatory;
> };
>
> +struct led_hw_trigger_type {
> + int dummy;
> +};
> +
> struct led_classdev {
> const char *name;
> enum led_brightness brightness;
> @@ -141,6 +145,9 @@ struct led_classdev {
> void *trigger_data;
> /* true if activated - deactivate routine uses it to do cleanup */
> bool activated;
> +
> + /* LEDs that have private triggers have this set */
> + struct led_hw_trigger_type *trigger_type;
> #endif
>
> #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
> @@ -345,6 +352,9 @@ struct led_trigger {
> int (*activate)(struct led_classdev *led_cdev);
> void (*deactivate)(struct led_classdev *led_cdev);
>
> + /* LED-private triggers have this set */
> + struct led_hw_trigger_type *trigger_type;
> +
> /* LEDs under control by this trigger (for simple triggers) */
> rwlock_t leddev_list_lock;
> struct list_head led_cdevs;
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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