Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758465Ab2EUUbs (ORCPT ); Mon, 21 May 2012 16:31:48 -0400 Received: from mail-wg0-f42.google.com ([74.125.82.42]:56930 "EHLO mail-wg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754044Ab2EUUbr (ORCPT ); Mon, 21 May 2012 16:31:47 -0400 From: Fabio Baltieri To: linux-kernel@vger.kernel.org, Richard Purdie Cc: Oliver Hartkopp , Wolfgang Grandegger , Fabio Baltieri , Andrew Morton Subject: [PATCH RESEND] leds: add oneshot blink functions Date: Mon, 21 May 2012 22:31:14 +0200 Message-Id: <1337632274-2261-1-git-send-email-fabio.baltieri@gmail.com> X-Mailer: git-send-email 1.7.5.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9920 Lines: 296 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 events, 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, blinking the led off, than on and leaving the led on after the sequence. Signed-off-by: Fabio Baltieri Cc: Richard Purdie Cc: Andrew Morton --- Hi all! Since merge window is open I'm resending this PATCH/RFC. First mail was a bit long so I'll try to make a long story short. This is a proposal to add a LED-class one-shot library function, to be used by one-shot event triggers, like ide-disk or xt_LED, which currently implements framework-specific led control code. This implementation have been developed after a discussion on the linux-can list on a patch I proposed which used another framework-specific implementation of a one-shot trigger. That's the link of the linux-can patch where the discussion started: http://article.gmane.org/gmane.linux.can/1085 And that's my original post of this one with a more detailed description: https://lkml.org/lkml/2012/5/8/41 So, my question is, what do you think is better between framework-specific implementation (simple/light) and generic led-class level trigger - like this patch - (less code duplication, useful in other frameworks) for one-shot event triggers? Personally, I'm voting for the first version, as in my patch in linux-can, because the implementation is cleaner, but some other opinion would be valuable. If we'll get to a point, I'll post a v3 of my canbus-led-triggers patch for proposed integration, based either on the original version or on this patch. Regards, 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 46b4c76..351cbde 100644 --- a/drivers/leds/led-triggers.c +++ b/drivers/leds/led-triggers.c @@ -230,9 +230,11 @@ void led_trigger_event(struct led_trigger *trigger, } EXPORT_SYMBOL_GPL(led_trigger_event); -void led_trigger_blink(struct led_trigger *trigger, - unsigned long *delay_on, - unsigned long *delay_off) +void led_trigger_blink_setup(struct led_trigger *trigger, + 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 *trigger, 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(&trigger->leddev_list_lock); } + +void led_trigger_blink(struct led_trigger *trigger, + unsigned long *delay_on, + unsigned long *delay_off) +{ + led_trigger_blink_setup(trigger, delay_on, delay_off, 0, 0); +} EXPORT_SYMBOL_GPL(led_trigger_blink); +void led_trigger_blink_oneshot(struct led_trigger *trigger, + unsigned long *delay_on, + unsigned long *delay_off, + int invert) +{ + led_trigger_blink_setup(trigger, 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 *trigger; 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 -- 1.7.10.2.520.g6a4a482.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/