From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cmhbu-0006UR-Pz for barebox@lists.infradead.org; Sat, 11 Mar 2017 14:03:11 +0000 From: Oleksij Rempel Date: Sat, 11 Mar 2017 15:02:34 +0100 Message-Id: <20170311140237.6958-1-o.rempel@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 1/4] led: Allow blinking/flashing on led level To: barebox@lists.infradead.org Cc: Markus Pargmann From: Sascha Hauer So far blinking/flashing LEDs is only supported on led-trigger level. Even without triggers it useful to be able to blink/flash LEDs, so add this functionality to the LED core. Signed-off-by: Sascha Hauer led: Introduce led_blink_pattern for flexible LED blinking A pattern consists of a number of on and off-periods which are described in an array. Using such an array you can encode nearly every blink pattern you need. led_blink and led_flash are rewritten to use the new mechanism. Signed-off-by: Markus Pargmann --- drivers/led/core.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++++- include/led.h | 11 ++++++ 2 files changed, 112 insertions(+), 1 deletion(-) diff --git a/drivers/led/core.c b/drivers/led/core.c index 30b016b..ab293b5 100644 --- a/drivers/led/core.c +++ b/drivers/led/core.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include #include @@ -101,7 +102,7 @@ struct led *led_by_name_or_number(const char *str) * @param led the led * @param value the value of the LED (0 is disabled) */ -int led_set(struct led *led, unsigned int value) +static int __led_set(struct led *led, unsigned int value) { if (value > led->max_value) value = led->max_value; @@ -114,6 +115,105 @@ int led_set(struct led *led, unsigned int value) return 0; } +int led_set(struct led *led, unsigned int value) +{ + led->blink = 0; + led->flash = 0; + return __led_set(led, value); +} + +static void led_blink_func(struct poller_struct *poller) +{ + struct led *led; + + list_for_each_entry(led, &leds, list) { + bool on; + + if (!led->blink && !led->flash) + continue; + + if (led->blink_next_event > get_time_ns()) { + continue; + } + + on = !(led->blink_next_state % 2); + + led->blink_next_event = get_time_ns() + + (led->blink_states[led->blink_next_state] * MSECOND); + led->blink_next_state = (led->blink_next_state + 1) % + led->blink_nr_states; + + if (led->flash && !on) + led->flash = 0; + + __led_set(led, on); + } +} + +/** + * led_blink_pattern - Blink a led with flexible timings. + * @led LED used + * @pattern Array of millisecond intervals describing the on and off periods of + * the pattern. At the end of the array/pattern it is repeated. The array + * starts with an on-period. In general every array item with even index + * describes an on-period, every item with odd index an off-period. + * @pattern_len Length of the pattern array. + * + * Returns 0 on success. + * + * Example: + * pattern = {500, 1000}; + * This will enable the LED for 500ms and disable it for 1000ms after + * that. This is repeated forever. + */ +int led_blink_pattern(struct led *led, const unsigned int *pattern, + unsigned int pattern_len) +{ + if (led->blink_states) + free(led->blink_states); + led->blink_states = xmemdup(pattern, + pattern_len * sizeof(*led->blink_states)); + led->blink_nr_states = pattern_len; + led->blink_next_state = 0; + led->blink_next_event = get_time_ns(); + led->blink = 1; + led->flash = 0; + + return 0; +} + +int led_blink(struct led *led, unsigned int on_ms, unsigned int off_ms) +{ + unsigned int pattern[] = {on_ms, off_ms}; + + return led_blink_pattern(led, pattern, 2); +} + +int led_flash(struct led *led, unsigned int duration_ms) +{ + unsigned int pattern[] = {duration_ms, 0}; + int ret; + + ret = led_blink_pattern(led, pattern, 2); + if (ret) + return ret; + + led->flash = 1; + led->blink = 0; + + return 0; +} + +static struct poller_struct led_poller = { + .func = led_blink_func, +}; + +static int led_blink_init(void) +{ + return poller_register(&led_poller); +} +late_initcall(led_blink_init); + /** * led_set_num - set the value of a LED * @param num the number of the LED diff --git a/include/led.h b/include/led.h index 000267c..fb5c48b 100644 --- a/include/led.h +++ b/include/led.h @@ -12,6 +12,13 @@ struct led { char *name; int num; struct list_head list; + + int blink; + int flash; + unsigned int *blink_states; + int blink_nr_states; + int blink_next_state; + uint64_t blink_next_event; }; struct led *led_by_number(int no); @@ -25,6 +32,10 @@ static inline int led_get_number(struct led *led) int led_set_num(int num, unsigned int value); int led_set(struct led *led, unsigned int value); +int led_blink(struct led *led, unsigned int on_ms, unsigned int off_ms); +int led_blink_pattern(struct led *led, const unsigned int *pattern, + unsigned int pattern_len); +int led_flash(struct led *led, unsigned int duration_ms); int led_register(struct led *led); void led_unregister(struct led *led); void led_unregister(struct led *led); -- 2.7.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox