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Message-ID: <1338135226.2968.22.camel@lorien2>
Date: Sun, 27 May 2012 10:13:46 -0600
From: Shuah Khan <shuahkhan@...il.com>
To: Fabio Baltieri <fabio.baltieri@...il.com>,
Bryan Wu <bryan.wu@...onical.com>
Cc: shuahkhan@...il.com, linux-leds@...r.kernel.org,
linux-kernel@...r.kernel.org, Richard Purdie <rpurdie@...ys.net>
Subject: Re: [PATCH v2 1/3] leds: add oneshot blink functions
On Sun, 2012-05-27 at 01:19 +0200, Fabio Baltieri wrote:
> Add two new functions, led_blink_set_oneshot and
> led_trigger_blink_oneshot, to be used by triggers for one-shot blink of
> led devices.
>
> This is implemented extending the existing software-blink code, and uses
> the same timer and handler function.
>
> The behavior of the code is to do a blink-on, blink-off sequence when
> the function is called, ignoring other calls until the sequence is
> completed so that the leds keep blinking at constant rate if the
> functions are called repeatedly.
>
> This is meant to be used by drivers which needs to trigger on sporadic
> event, but doesn't have clear busy/idle trigger points.
>
> After the blink sequence the led remains off. This behavior can be
> inverted setting the "invert" argument, which blink the led off, than on
> and leave the led on after the sequence.
>
> Signed-off-by: Fabio Baltieri <fabio.baltieri@...il.com>
> Cc: Bryan Wu <bryan.wu@...onical.com>
> ---
>
> Same patch as v1 but rebased on Bryan's linux-leds tree.
Fabio/Bryan,
Please take a look at linux-next. I am concerned that this work
conflicts with LEDS_TRIGGER_TIMER implementation. Anyways using
linux-next is more appropriate here, as there were a few patches that
went in while Andrew Morton was acting as a maintainer for leds
sub-system.
-- Shuah
>
> More info in original thread:
> http://marc.info/?l=linux-kernel&m=133763247601381&w=2
>
> Tested on an x86 system with a custom usb-led device (http://wp.me/p1M1k7-fZ
> for the curious).
>
> Fabio
>
> drivers/leds/led-class.c | 19 +++++++++++++++++
> drivers/leds/led-core.c | 50 ++++++++++++++++++++++++++++++++++-----------
> drivers/leds/led-triggers.c | 30 +++++++++++++++++++++++----
> include/linux/leds.h | 25 +++++++++++++++++++++++
> 4 files changed, 108 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 5bff843..42d9359 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -91,6 +91,11 @@ static void led_timer_function(unsigned long data)
> return;
> }
>
> + if (led_cdev->flags & LED_BLINK_ONESHOT_STOP) {
> + led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
> + return;
> + }
> +
> brightness = led_get_brightness(led_cdev);
> if (!brightness) {
> /* Time to switch the LED on. */
> @@ -107,6 +112,20 @@ static void led_timer_function(unsigned long data)
>
> led_set_brightness(led_cdev, brightness);
>
> + /* Return in next iteration if led is in one-shot mode and we are in
> + * the final blink state so that the led is toggled each delay_on +
> + * delay_off milliseconds in worst case.
> + */
> + if (led_cdev->flags & LED_BLINK_ONESHOT) {
> + if (led_cdev->flags & LED_BLINK_INVERT) {
> + if (brightness)
> + led_cdev->flags |= LED_BLINK_ONESHOT_STOP;
> + } else {
> + if (!brightness)
> + led_cdev->flags |= LED_BLINK_ONESHOT_STOP;
> + }
> + }
> +
> mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
> }
>
> diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
> index d686004..579eb78 100644
> --- a/drivers/leds/led-core.c
> +++ b/drivers/leds/led-core.c
> @@ -27,7 +27,6 @@ EXPORT_SYMBOL_GPL(leds_list);
> static void led_stop_software_blink(struct led_classdev *led_cdev)
> {
> /* deactivate previous settings */
> - del_timer_sync(&led_cdev->blink_timer);
> led_cdev->blink_delay_on = 0;
> led_cdev->blink_delay_off = 0;
> }
> @@ -44,11 +43,6 @@ static void led_set_software_blink(struct led_classdev *led_cdev,
> if (!led_cdev->blink_brightness)
> led_cdev->blink_brightness = led_cdev->max_brightness;
>
> - if (led_get_trigger_data(led_cdev) &&
> - delay_on == led_cdev->blink_delay_on &&
> - delay_off == led_cdev->blink_delay_off)
> - return;
> -
> led_stop_software_blink(led_cdev);
>
> led_cdev->blink_delay_on = delay_on;
> @@ -68,13 +62,12 @@ static void led_set_software_blink(struct led_classdev *led_cdev,
> }
>
>
> -void led_blink_set(struct led_classdev *led_cdev,
> - unsigned long *delay_on,
> - unsigned long *delay_off)
> +void led_blink_setup(struct led_classdev *led_cdev,
> + unsigned long *delay_on,
> + unsigned long *delay_off)
> {
> - del_timer_sync(&led_cdev->blink_timer);
> -
> - if (led_cdev->blink_set &&
> + if (!(led_cdev->flags & LED_BLINK_ONESHOT) &&
> + led_cdev->blink_set &&
> !led_cdev->blink_set(led_cdev, delay_on, delay_off))
> return;
>
> @@ -84,8 +77,41 @@ void led_blink_set(struct led_classdev *led_cdev,
>
> led_set_software_blink(led_cdev, *delay_on, *delay_off);
> }
> +
> +void led_blink_set(struct led_classdev *led_cdev,
> + unsigned long *delay_on,
> + unsigned long *delay_off)
> +{
> + del_timer_sync(&led_cdev->blink_timer);
> +
> + led_cdev->flags &= ~LED_BLINK_ONESHOT;
> + led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
> +
> + led_blink_setup(led_cdev, delay_on, delay_off);
> +}
> EXPORT_SYMBOL(led_blink_set);
>
> +void led_blink_set_oneshot(struct led_classdev *led_cdev,
> + unsigned long *delay_on,
> + unsigned long *delay_off,
> + int invert)
> +{
> + if ((led_cdev->flags & LED_BLINK_ONESHOT) &&
> + timer_pending(&led_cdev->blink_timer))
> + return;
> +
> + led_cdev->flags |= LED_BLINK_ONESHOT;
> + led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
> +
> + if (invert)
> + led_cdev->flags |= LED_BLINK_INVERT;
> + else
> + led_cdev->flags &= ~LED_BLINK_INVERT;
> +
> + led_blink_setup(led_cdev, delay_on, delay_off);
> +}
> +EXPORT_SYMBOL(led_blink_set_oneshot);
> +
> void led_brightness_set(struct led_classdev *led_cdev,
> enum led_brightness brightness)
> {
> diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
> index b449ed8..fa0b9be 100644
> --- a/drivers/leds/led-triggers.c
> +++ b/drivers/leds/led-triggers.c
> @@ -230,9 +230,11 @@ void led_trigger_event(struct led_trigger *trig,
> }
> EXPORT_SYMBOL_GPL(led_trigger_event);
>
> -void led_trigger_blink(struct led_trigger *trig,
> - unsigned long *delay_on,
> - unsigned long *delay_off)
> +void led_trigger_blink_setup(struct led_trigger *trig,
> + unsigned long *delay_on,
> + unsigned long *delay_off,
> + int oneshot,
> + int invert)
> {
> struct list_head *entry;
>
> @@ -244,12 +246,32 @@ void led_trigger_blink(struct led_trigger *trig,
> struct led_classdev *led_cdev;
>
> led_cdev = list_entry(entry, struct led_classdev, trig_list);
> - led_blink_set(led_cdev, delay_on, delay_off);
> + if (oneshot)
> + led_blink_set_oneshot(led_cdev, delay_on, delay_off,
> + invert);
> + else
> + led_blink_set(led_cdev, delay_on, delay_off);
> }
> read_unlock(&trig->leddev_list_lock);
> }
> +
> +void led_trigger_blink(struct led_trigger *trig,
> + unsigned long *delay_on,
> + unsigned long *delay_off)
> +{
> + led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0);
> +}
> EXPORT_SYMBOL_GPL(led_trigger_blink);
>
> +void led_trigger_blink_oneshot(struct led_trigger *trig,
> + unsigned long *delay_on,
> + unsigned long *delay_off,
> + int invert)
> +{
> + led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert);
> +}
> +EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot);
> +
> void led_trigger_register_simple(const char *name, struct led_trigger **tp)
> {
> struct led_trigger *trig;
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index 5884def..f252438 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -38,6 +38,9 @@ struct led_classdev {
> #define LED_SUSPENDED (1 << 0)
> /* Upper 16 bits reflect control information */
> #define LED_CORE_SUSPENDRESUME (1 << 16)
> +#define LED_BLINK_ONESHOT (1 << 17)
> +#define LED_BLINK_ONESHOT_STOP (1 << 18)
> +#define LED_BLINK_INVERT (1 << 19)
>
> /* Set LED brightness level */
> /* Must not sleep, use a workqueue if needed */
> @@ -101,6 +104,24 @@ extern void led_blink_set(struct led_classdev *led_cdev,
> unsigned long *delay_on,
> unsigned long *delay_off);
> /**
> + * led_blink_set_oneshot - do a oneshot software blink
> + * @led_cdev: the LED to start blinking
> + * @delay_on: the time it should be on (in ms)
> + * @delay_off: the time it should ble off (in ms)
> + * @invert: blink off, then on, leaving the led on
> + *
> + * This function makes the LED blink one time for delay_on +
> + * delay_off time, ignoring the request if another one-shot
> + * blink is already in progress.
> + *
> + * If invert is set, led blinks for delay_off first, then for
> + * delay_on and leave the led on after the on-off cycle.
> + */
> +extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
> + unsigned long *delay_on,
> + unsigned long *delay_off,
> + int invert);
> +/**
> * led_brightness_set - set LED brightness
> * @led_cdev: the LED to set
> * @brightness: the brightness to set it to
> @@ -148,6 +169,10 @@ extern void led_trigger_event(struct led_trigger *trigger,
> extern void led_trigger_blink(struct led_trigger *trigger,
> unsigned long *delay_on,
> unsigned long *delay_off);
> +extern void led_trigger_blink_oneshot(struct led_trigger *trigger,
> + unsigned long *delay_on,
> + unsigned long *delay_off,
> + int invert);
>
> #else
>
--
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