From mboxrd@z Thu Jan 1 00:00:00 1970 From: Krzysztof Kozlowski Subject: [PATCH v7 4/5] leds: trigger: oneshot: Add initialization from Device Tree Date: Wed, 9 Jan 2019 15:44:48 +0100 Message-ID: <1547045089-19128-5-git-send-email-krzk@kernel.org> References: <1547045089-19128-1-git-send-email-krzk@kernel.org> Return-path: In-Reply-To: <1547045089-19128-1-git-send-email-krzk@kernel.org> Sender: linux-kernel-owner@vger.kernel.org To: Jacek Anaszewski , Pavel Machek , Rob Herring , Mark Rutland , linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org Cc: Krzysztof Kozlowski List-Id: devicetree@vger.kernel.org Allow initialization of delays used in oneshot trigger from Device Tree property. This is especially useful for embedded systems where the trigger might be used early, before bringing up user-space. Signed-off-by: Krzysztof Kozlowski --- drivers/leds/trigger/ledtrig-oneshot.c | 38 ++++++++++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-) diff --git a/drivers/leds/trigger/ledtrig-oneshot.c b/drivers/leds/trigger/ledtrig-oneshot.c index 95c9be4b6e7e..8808f0ad7339 100644 --- a/drivers/leds/trigger/ledtrig-oneshot.c +++ b/drivers/leds/trigger/ledtrig-oneshot.c @@ -130,6 +130,34 @@ static struct attribute *oneshot_trig_attrs[] = { }; ATTRIBUTE_GROUPS(oneshot_trig); +static void pattern_init(struct led_classdev *led_cdev) +{ + u32 *pattern; + unsigned int size = 0; + + pattern = led_get_default_pattern(led_cdev, &size); + if (!pattern) + goto out_default; + + if (size != 2) { + dev_warn(led_cdev->dev, + "Expected 2 but got %u values for delays pattern\n", + size); + goto out_default; + } + + led_cdev->blink_delay_on = pattern[0]; + led_cdev->blink_delay_off = pattern[1]; + kfree(pattern); + + return; + +out_default: + kfree(pattern); + led_cdev->blink_delay_on = DEFAULT_DELAY; + led_cdev->blink_delay_off = DEFAULT_DELAY; +} + static int oneshot_trig_activate(struct led_classdev *led_cdev) { struct oneshot_trig_data *oneshot_data; @@ -140,8 +168,14 @@ static int oneshot_trig_activate(struct led_classdev *led_cdev) led_set_trigger_data(led_cdev, oneshot_data); - led_cdev->blink_delay_on = DEFAULT_DELAY; - led_cdev->blink_delay_off = DEFAULT_DELAY; + if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) { + pattern_init(led_cdev); + /* + * Mark as initialized even on pattern_init() error because + * any consecutive call to it would produce the same error. + */ + led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER; + } return 0; } -- 2.7.4