From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933569AbbEOQr6 (ORCPT ); Fri, 15 May 2015 12:47:58 -0400 Received: from smtp43.i.mail.ru ([94.100.177.103]:36641 "EHLO smtp43.i.mail.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752335AbbEOQry (ORCPT ); Fri, 15 May 2015 12:47:54 -0400 Message-ID: <55562329.9070604@list.ru> Date: Fri, 15 May 2015 19:47:37 +0300 From: Stas Sergeev User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 MIME-Version: 1.0 To: linux-leds@vger.kernel.org CC: Linux kernel , Stas Sergeev , Bryan Wu , Richard Purdie , Michael Hennerich , Jan-Simon Moeller , Support Opensource , Milo Kim , Riku Voipio , Jacek Anaszewski , Kyungmin Park , patches@opensource.wolfsonmicro.com Subject: [PATCH] leds: put hard limit on minimum blink period for slow leds Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Spam: Not detected X-Mras: Ok Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently the timer trigger allows to set blink period as small as 1mS. But in fact the minimum period is jiffy, which is usually 10mS. The following mail says: http://lkml.iu.edu/hypermail/linux/kernel/1504.3/03469.html --- As I mentioned before even with hr timer it wouldn't be possible to assure that 1ms is achievable due to locking and bus latency reasons. --- So the limit of 10mS should be enforced for drivers that use waiting operations, like transfers across slow bus. This allows to stay on safe side when CONFIG_HZ is set to eg 1000. This patch differentiates the "slow" drivers by marking them with the new LED_BRIGHTNESS_SLOW flag. Currently every driver that uses a work-queue in .brightness_set op, is marked as such. The extra bonus is the possibility of a further development aiming for software PWM for "fast" drivers. CC: Bryan Wu CC: Richard Purdie CC: Michael Hennerich CC: Jan-Simon Moeller CC: Support Opensource CC: Milo Kim CC: Riku Voipio CC: Jacek Anaszewski CC: Kyungmin Park CC: linux-leds@vger.kernel.org CC: linux-kernel@vger.kernel.org CC: patches@opensource.wolfsonmicro.com Signed-off-by: Stas Sergeev --- drivers/leds/led-core.c | 30 +++++++++++++++++++----------- drivers/leds/led-triggers.c | 8 +++++--- drivers/leds/leds-88pm860x.c | 1 + drivers/leds/leds-adp5520.c | 1 + drivers/leds/leds-bd2802.c | 2 +- drivers/leds/leds-blinkm.c | 3 ++- drivers/leds/leds-da903x.c | 1 + drivers/leds/leds-da9052.c | 1 + drivers/leds/leds-dac124s085.c | 1 + drivers/leds/leds-gpio.c | 2 ++ drivers/leds/leds-lm3533.c | 1 + drivers/leds/leds-lm355x.c | 1 + drivers/leds/leds-lm3642.c | 1 + drivers/leds/leds-lp3944.c | 3 ++- drivers/leds/leds-lp55xx-common.c | 1 + drivers/leds/leds-lp8788.c | 1 + drivers/leds/leds-lp8860.c | 1 + drivers/leds/leds-lt3593.c | 1 + drivers/leds/leds-mc13783.c | 3 ++- drivers/leds/leds-pca9532.c | 1 + drivers/leds/leds-pca955x.c | 1 + drivers/leds/leds-pca963x.c | 1 + drivers/leds/leds-pwm.c | 4 +++- drivers/leds/leds-regulator.c | 2 +- drivers/leds/leds-tca6507.c | 1 + drivers/leds/leds-wm831x-status.c | 1 + drivers/leds/leds-wm8350.c | 2 +- drivers/leds/trigger/ledtrig-oneshot.c | 5 ++++- drivers/leds/trigger/ledtrig-timer.c | 18 +++++++++++++----- include/linux/leds.h | 8 ++++++-- 30 files changed, 78 insertions(+), 29 deletions(-) diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c index 9886dac..2653755 100644 --- a/drivers/leds/led-core.c +++ b/drivers/leds/led-core.c @@ -25,12 +25,19 @@ EXPORT_SYMBOL_GPL(leds_list_lock); LIST_HEAD(leds_list); EXPORT_SYMBOL_GPL(leds_list); -static void led_set_software_blink(struct led_classdev *led_cdev, +static int led_set_software_blink(struct led_classdev *led_cdev, unsigned long delay_on, unsigned long delay_off) { int current_brightness; + if (led_cdev->flags & LED_BRIGHTNESS_SLOW) { + if (delay_on < LED_SLOW_MIN_PERIOD) + return -EINVAL; + if (delay_off < LED_SLOW_MIN_PERIOD) + return -EINVAL; + } + current_brightness = led_get_brightness(led_cdev); if (current_brightness) led_cdev->blink_brightness = current_brightness; @@ -43,36 +50,37 @@ static void led_set_software_blink(struct led_classdev *led_cdev, /* never on - just set to off */ if (!delay_on) { led_set_brightness_async(led_cdev, LED_OFF); - return; + return 0; } /* never off - just set to brightness */ if (!delay_off) { led_set_brightness_async(led_cdev, led_cdev->blink_brightness); - return; + return 0; } mod_timer(&led_cdev->blink_timer, jiffies + 1); + return 0; } -static void led_blink_setup(struct led_classdev *led_cdev, +static int led_blink_setup(struct led_classdev *led_cdev, unsigned long *delay_on, unsigned long *delay_off) { if (!(led_cdev->flags & LED_BLINK_ONESHOT) && led_cdev->blink_set && !led_cdev->blink_set(led_cdev, delay_on, delay_off)) - return; + return 0; /* blink with 1 Hz as default if nothing specified */ if (!*delay_on && !*delay_off) *delay_on = *delay_off = 500; - led_set_software_blink(led_cdev, *delay_on, *delay_off); + return led_set_software_blink(led_cdev, *delay_on, *delay_off); } -void led_blink_set(struct led_classdev *led_cdev, +int led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on, unsigned long *delay_off) { @@ -81,18 +89,18 @@ void led_blink_set(struct led_classdev *led_cdev, led_cdev->flags &= ~LED_BLINK_ONESHOT; led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP; - led_blink_setup(led_cdev, delay_on, delay_off); + return led_blink_setup(led_cdev, delay_on, delay_off); } EXPORT_SYMBOL(led_blink_set); -void led_blink_set_oneshot(struct led_classdev *led_cdev, +int 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; + return -EBUSY; led_cdev->flags |= LED_BLINK_ONESHOT; led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP; @@ -102,7 +110,7 @@ void led_blink_set_oneshot(struct led_classdev *led_cdev, else led_cdev->flags &= ~LED_BLINK_INVERT; - led_blink_setup(led_cdev, delay_on, delay_off); + return led_blink_setup(led_cdev, delay_on, delay_off); } EXPORT_SYMBOL(led_blink_set_oneshot); diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c index e8b1120..012b94c 100644 --- a/drivers/leds/led-triggers.c +++ b/drivers/leds/led-triggers.c @@ -272,6 +272,7 @@ static void led_trigger_blink_setup(struct led_trigger *trig, int oneshot, int invert) { + int rc = 0; struct led_classdev *led_cdev; if (!trig) @@ -280,12 +281,13 @@ static void led_trigger_blink_setup(struct led_trigger *trig, read_lock(&trig->leddev_list_lock); list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) { if (oneshot) - led_blink_set_oneshot(led_cdev, delay_on, delay_off, - invert); + rc = led_blink_set_oneshot(led_cdev, delay_on, + delay_off, invert); else - led_blink_set(led_cdev, delay_on, delay_off); + rc = led_blink_set(led_cdev, delay_on, delay_off); } read_unlock(&trig->leddev_list_lock); + WARN_ON(rc); } void led_trigger_blink(struct led_trigger *trig, diff --git a/drivers/leds/leds-88pm860x.c b/drivers/leds/leds-88pm860x.c index 1497a09..b21e6ac 100644 --- a/drivers/leds/leds-88pm860x.c +++ b/drivers/leds/leds-88pm860x.c @@ -213,6 +213,7 @@ static int pm860x_led_probe(struct platform_device *pdev) data->current_brightness = 0; data->cdev.name = data->name; data->cdev.brightness_set = pm860x_led_set; + data->cdev.flags |= LED_BRIGHTNESS_SLOW; mutex_init(&data->lock); INIT_WORK(&data->work, pm860x_led_work); diff --git a/drivers/leds/leds-adp5520.c b/drivers/leds/leds-adp5520.c index 07e66ca..f3540c2 100644 --- a/drivers/leds/leds-adp5520.c +++ b/drivers/leds/leds-adp5520.c @@ -137,6 +137,7 @@ static int adp5520_led_probe(struct platform_device *pdev) led_dat->cdev.default_trigger = cur_led->default_trigger; led_dat->cdev.brightness_set = adp5520_led_set; led_dat->cdev.brightness = LED_OFF; + led_dat->cdev.flags |= LED_BRIGHTNESS_SLOW; if (cur_led->flags & ADP5520_FLAG_LED_MASK) led_dat->flags = cur_led->flags; diff --git a/drivers/leds/leds-bd2802.c b/drivers/leds/leds-bd2802.c index 6078c15..3aba6af 100644 --- a/drivers/leds/leds-bd2802.c +++ b/drivers/leds/leds-bd2802.c @@ -633,7 +633,7 @@ static int bd2802_register_led_classdev(struct bd2802_led *led) led->cdev_led2b.brightness = LED_OFF; led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness; led->cdev_led2b.blink_set = bd2802_set_led2b_blink; - led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME; + led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME | LED_BRIGHTNESS_SLOW; ret = led_classdev_register(&led->client->dev, &led->cdev_led2b); if (ret < 0) { diff --git a/drivers/leds/leds-blinkm.c b/drivers/leds/leds-blinkm.c index d0452b0..e5cc289 100644 --- a/drivers/leds/leds-blinkm.c +++ b/drivers/leds/leds-blinkm.c @@ -668,7 +668,8 @@ static int blinkm_probe(struct i2c_client *client, led[i]->i2c_client = client; led[i]->id = i; led[i]->led_cdev.max_brightness = 255; - led[i]->led_cdev.flags = LED_CORE_SUSPENDRESUME; + led[i]->led_cdev.flags = LED_CORE_SUSPENDRESUME | + LED_BRIGHTNESS_SLOW; atomic_set(&led[i]->active, 0); switch (i) { case RED: diff --git a/drivers/leds/leds-da903x.c b/drivers/leds/leds-da903x.c index 952ba96e..af6318f 100644 --- a/drivers/leds/leds-da903x.c +++ b/drivers/leds/leds-da903x.c @@ -115,6 +115,7 @@ static int da903x_led_probe(struct platform_device *pdev) led->cdev.default_trigger = pdata->default_trigger; led->cdev.brightness_set = da903x_led_set; led->cdev.brightness = LED_OFF; + led->cdev.flags |= LED_BRIGHTNESS_SLOW; led->id = id; led->flags = pdata->flags; diff --git a/drivers/leds/leds-da9052.c b/drivers/leds/leds-da9052.c index 28291b6..0c12b46 100644 --- a/drivers/leds/leds-da9052.c +++ b/drivers/leds/leds-da9052.c @@ -137,6 +137,7 @@ static int da9052_led_probe(struct platform_device *pdev) led[i].cdev.brightness = LED_OFF; led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; led[i].brightness = LED_OFF; + led[i].flags |= LED_BRIGHTNESS_SLOW; led[i].led_index = pled->leds[i].flags; led[i].da9052 = dev_get_drvdata(pdev->dev.parent); INIT_WORK(&led[i].work, da9052_led_work); diff --git a/drivers/leds/leds-dac124s085.c b/drivers/leds/leds-dac124s085.c index db3ba8b..64b3ed7 100644 --- a/drivers/leds/leds-dac124s085.c +++ b/drivers/leds/leds-dac124s085.c @@ -88,6 +88,7 @@ static int dac124s085_probe(struct spi_device *spi) led->ldev.brightness = LED_OFF; led->ldev.max_brightness = 0xfff; led->ldev.brightness_set = dac124s085_set_brightness; + led->ldev.flags |= LED_BRIGHTNESS_SLOW; ret = led_classdev_register(&spi->dev, &led->ldev); if (ret < 0) goto eledcr; diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c index 15eb3f8..45c0bb1 100644 --- a/drivers/leds/leds-gpio.c +++ b/drivers/leds/leds-gpio.c @@ -137,6 +137,8 @@ static int create_gpio_led(const struct gpio_led *template, led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; if (!template->retain_state_suspended) led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; + if (led_dat->can_sleep) + led_dat->cdev.flags |= LED_BRIGHTNESS_SLOW; ret = gpiod_direction_output(led_dat->gpiod, state); if (ret < 0) diff --git a/drivers/leds/leds-lm3533.c b/drivers/leds/leds-lm3533.c index 6e2e020..f70cd0e 100644 --- a/drivers/leds/leds-lm3533.c +++ b/drivers/leds/leds-lm3533.c @@ -697,6 +697,7 @@ static int lm3533_led_probe(struct platform_device *pdev) led->cdev.brightness_get = lm3533_led_get; led->cdev.blink_set = lm3533_led_blink_set; led->cdev.brightness = LED_OFF; + led->cdev.flags |= LED_BRIGHTNESS_SLOW; led->cdev.groups = lm3533_led_attribute_groups, led->id = pdev->id; diff --git a/drivers/leds/leds-lm355x.c b/drivers/leds/leds-lm355x.c index f5112cb..4a9948b 100644 --- a/drivers/leds/leds-lm355x.c +++ b/drivers/leds/leds-lm355x.c @@ -483,6 +483,7 @@ static int lm355x_probe(struct i2c_client *client, chip->cdev_flash.name = "flash"; chip->cdev_flash.max_brightness = 16; chip->cdev_flash.brightness_set = lm355x_strobe_brightness_set; + chip->cdev_flash.flags |= LED_BRIGHTNESS_SLOW; chip->cdev_flash.default_trigger = "flash"; err = led_classdev_register((struct device *) &client->dev, &chip->cdev_flash); diff --git a/drivers/leds/leds-lm3642.c b/drivers/leds/leds-lm3642.c index d3dec01..84bb319 100644 --- a/drivers/leds/leds-lm3642.c +++ b/drivers/leds/leds-lm3642.c @@ -375,6 +375,7 @@ static int lm3642_probe(struct i2c_client *client, chip->cdev_flash.name = "flash"; chip->cdev_flash.max_brightness = 16; chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set; + chip->cdev_flash.flags |= LED_BRIGHTNESS_SLOW; chip->cdev_flash.default_trigger = "flash"; chip->cdev_flash.groups = lm3642_flash_groups, err = led_classdev_register((struct device *) diff --git a/drivers/leds/leds-lp3944.c b/drivers/leds/leds-lp3944.c index 53144fb..70b15b3 100644 --- a/drivers/leds/leds-lp3944.c +++ b/drivers/leds/leds-lp3944.c @@ -323,7 +323,8 @@ static int lp3944_configure(struct i2c_client *client, led->ldev.max_brightness = 1; led->ldev.brightness_set = lp3944_led_set_brightness; led->ldev.blink_set = lp3944_led_set_blink; - led->ldev.flags = LED_CORE_SUSPENDRESUME; + led->ldev.flags = LED_CORE_SUSPENDRESUME | + LED_BRIGHTNESS_SLOW; INIT_WORK(&led->work, lp3944_led_work); err = led_classdev_register(&client->dev, &led->ldev); diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c index 77c26bc..02bc090 100644 --- a/drivers/leds/leds-lp55xx-common.c +++ b/drivers/leds/leds-lp55xx-common.c @@ -173,6 +173,7 @@ static int lp55xx_init_led(struct lp55xx_led *led, } led->cdev.brightness_set = lp55xx_set_brightness; + led->cdev.flags |= LED_BRIGHTNESS_SLOW; led->cdev.groups = lp55xx_led_groups; if (pdata->led_config[chan].name) { diff --git a/drivers/leds/leds-lp8788.c b/drivers/leds/leds-lp8788.c index 3409f03..3fe2983 100644 --- a/drivers/leds/leds-lp8788.c +++ b/drivers/leds/leds-lp8788.c @@ -140,6 +140,7 @@ static int lp8788_led_probe(struct platform_device *pdev) led->lp = lp; led->led_dev.max_brightness = MAX_BRIGHTNESS; led->led_dev.brightness_set = lp8788_brightness_set; + led->led_dev.flags |= LED_BRIGHTNESS_SLOW; led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL; diff --git a/drivers/leds/leds-lp8860.c b/drivers/leds/leds-lp8860.c index 8c2b7fb..9270410 100644 --- a/drivers/leds/leds-lp8860.c +++ b/drivers/leds/leds-lp8860.c @@ -407,6 +407,7 @@ static int lp8860_probe(struct i2c_client *client, led->led_dev.name = led->label; led->led_dev.max_brightness = LED_FULL; led->led_dev.brightness_set = lp8860_brightness_set; + led->led_dev.flags |= LED_BRIGHTNESS_SLOW; mutex_init(&led->lock); INIT_WORK(&led->work, lp8860_led_brightness_work); diff --git a/drivers/leds/leds-lt3593.c b/drivers/leds/leds-lt3593.c index 9f41124..cedc31c 100644 --- a/drivers/leds/leds-lt3593.c +++ b/drivers/leds/leds-lt3593.c @@ -104,6 +104,7 @@ static int create_lt3593_led(const struct gpio_led *template, if (!template->retain_state_suspended) led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; + led_dat->cdev.flags |= LED_BRIGHTNESS_SLOW; ret = devm_gpio_request_one(parent, template->gpio, state ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW, diff --git a/drivers/leds/leds-mc13783.c b/drivers/leds/leds-mc13783.c index e2b847f..706a94f 100644 --- a/drivers/leds/leds-mc13783.c +++ b/drivers/leds/leds-mc13783.c @@ -256,7 +256,8 @@ static int __init mc13xxx_led_probe(struct platform_device *pdev) leds->led[i].leds = leds; leds->led[i].cdev.name = name; leds->led[i].cdev.default_trigger = trig; - leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME; + leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME | + LED_BRIGHTNESS_SLOW; leds->led[i].cdev.brightness_set = mc13xxx_led_set; leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id); diff --git a/drivers/leds/leds-pca9532.c b/drivers/leds/leds-pca9532.c index 5a6363d..e9bcd0e 100644 --- a/drivers/leds/leds-pca9532.c +++ b/drivers/leds/leds-pca9532.c @@ -361,6 +361,7 @@ static int pca9532_configure(struct i2c_client *client, led->ldev.brightness = LED_OFF; led->ldev.brightness_set = pca9532_set_brightness; led->ldev.blink_set = pca9532_set_blink; + led->ldev.flags |= LED_BRIGHTNESS_SLOW; INIT_WORK(&led->work, pca9532_led_work); err = led_classdev_register(&client->dev, &led->ldev); if (err < 0) { diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c index c3a08b6..2a6f1e5 100644 --- a/drivers/leds/leds-pca955x.c +++ b/drivers/leds/leds-pca955x.c @@ -329,6 +329,7 @@ static int pca955x_probe(struct i2c_client *client, pca955x_led->led_cdev.name = pca955x_led->name; pca955x_led->led_cdev.brightness_set = pca955x_led_set; + pca955x_led->led_cdev.flags |= LED_BRIGHTNESS_SLOW; INIT_WORK(&pca955x_led->work, pca955x_led_work); diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c index bee3e1a..0b2ff27 100644 --- a/drivers/leds/leds-pca963x.c +++ b/drivers/leds/leds-pca963x.c @@ -409,6 +409,7 @@ static int pca963x_probe(struct i2c_client *client, pca963x[i].led_cdev.name = pca963x[i].name; pca963x[i].led_cdev.brightness_set = pca963x_led_set; + pca963x[i].led_cdev.flags |= LED_BRIGHTNESS_SLOW; if (pdata && pdata->blink_type == PCA963X_HW_BLINK) pca963x[i].led_cdev.blink_set = pca963x_blink_set; diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c index 1d07e3e..daff48d 100644 --- a/drivers/leds/leds-pwm.c +++ b/drivers/leds/leds-pwm.c @@ -122,8 +122,10 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv, } led_data->can_sleep = pwm_can_sleep(led_data->pwm); - if (led_data->can_sleep) + if (led_data->can_sleep) { INIT_WORK(&led_data->work, led_pwm_work); + led_data->cdev.flags |= LED_BRIGHTNESS_SLOW; + } led_data->period = pwm_get_period(led_data->pwm); if (!led_data->period && (led->pwm_period_ns > 0)) diff --git a/drivers/leds/leds-regulator.c b/drivers/leds/leds-regulator.c index ffc2139..3b898fb 100644 --- a/drivers/leds/leds-regulator.c +++ b/drivers/leds/leds-regulator.c @@ -173,7 +173,7 @@ static int regulator_led_probe(struct platform_device *pdev) led->cdev.brightness_set = regulator_led_brightness_set; led->cdev.name = pdata->name; - led->cdev.flags |= LED_CORE_SUSPENDRESUME; + led->cdev.flags |= LED_CORE_SUSPENDRESUME | LED_BRIGHTNESS_SLOW; led->vcc = vcc; /* to handle correctly an already enabled regulator */ diff --git a/drivers/leds/leds-tca6507.c b/drivers/leds/leds-tca6507.c index 20fa8e7..8209b0d 100644 --- a/drivers/leds/leds-tca6507.c +++ b/drivers/leds/leds-tca6507.c @@ -788,6 +788,7 @@ static int tca6507_probe(struct i2c_client *client, = pdata->leds.leds[i].default_trigger; l->led_cdev.brightness_set = tca6507_brightness_set; l->led_cdev.blink_set = tca6507_blink_set; + l->led_cdev.flags |= LED_BRIGHTNESS_SLOW; l->bank = -1; err = led_classdev_register(&client->dev, &l->led_cdev); diff --git a/drivers/leds/leds-wm831x-status.c b/drivers/leds/leds-wm831x-status.c index 56027ef..7718dcd 100644 --- a/drivers/leds/leds-wm831x-status.c +++ b/drivers/leds/leds-wm831x-status.c @@ -288,6 +288,7 @@ static int wm831x_status_probe(struct platform_device *pdev) drvdata->cdev.name = pdata.name; drvdata->cdev.default_trigger = pdata.default_trigger; drvdata->cdev.brightness_set = wm831x_status_set; + drvdata->cdev.flags |= LED_BRIGHTNESS_SLOW; drvdata->cdev.blink_set = wm831x_status_blink_set; drvdata->cdev.groups = wm831x_status_groups; diff --git a/drivers/leds/leds-wm8350.c b/drivers/leds/leds-wm8350.c index 0d12183..ad1ada3 100644 --- a/drivers/leds/leds-wm8350.c +++ b/drivers/leds/leds-wm8350.c @@ -235,7 +235,7 @@ static int wm8350_led_probe(struct platform_device *pdev) led->cdev.brightness_set = wm8350_led_set; led->cdev.default_trigger = pdata->default_trigger; led->cdev.name = pdata->name; - led->cdev.flags |= LED_CORE_SUSPENDRESUME; + led->cdev.flags |= LED_CORE_SUSPENDRESUME | LED_BRIGHTNESS_SLOW; led->enabled = regulator_is_enabled(isink); led->isink = isink; led->dcdc = dcdc; diff --git a/drivers/leds/trigger/ledtrig-oneshot.c b/drivers/leds/trigger/ledtrig-oneshot.c index fbd02cd..ba91838 100644 --- a/drivers/leds/trigger/ledtrig-oneshot.c +++ b/drivers/leds/trigger/ledtrig-oneshot.c @@ -29,12 +29,15 @@ struct oneshot_trig_data { static ssize_t led_shot(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { + ssize_t ret; struct led_classdev *led_cdev = dev_get_drvdata(dev); struct oneshot_trig_data *oneshot_data = led_cdev->trigger_data; - led_blink_set_oneshot(led_cdev, + ret = led_blink_set_oneshot(led_cdev, &led_cdev->blink_delay_on, &led_cdev->blink_delay_off, oneshot_data->invert); + if (ret) + return ret; /* content is ignored */ return size; diff --git a/drivers/leds/trigger/ledtrig-timer.c b/drivers/leds/trigger/ledtrig-timer.c index 8d09327..edc0c7f 100644 --- a/drivers/leds/trigger/ledtrig-timer.c +++ b/drivers/leds/trigger/ledtrig-timer.c @@ -31,13 +31,15 @@ static ssize_t led_delay_on_store(struct device *dev, { struct led_classdev *led_cdev = dev_get_drvdata(dev); unsigned long state; - ssize_t ret = -EINVAL; + ssize_t ret; ret = kstrtoul(buf, 10, &state); if (ret) return ret; - led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off); + ret = led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off); + if (ret) + return ret; led_cdev->blink_delay_on = state; return size; @@ -56,13 +58,15 @@ static ssize_t led_delay_off_store(struct device *dev, { struct led_classdev *led_cdev = dev_get_drvdata(dev); unsigned long state; - ssize_t ret = -EINVAL; + ssize_t ret; ret = kstrtoul(buf, 10, &state); if (ret) return ret; - led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state); + ret = led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state); + if (ret) + return ret; led_cdev->blink_delay_off = state; return size; @@ -84,12 +88,16 @@ static void timer_trig_activate(struct led_classdev *led_cdev) if (rc) goto err_out_delayon; - led_blink_set(led_cdev, &led_cdev->blink_delay_on, + rc = led_blink_set(led_cdev, &led_cdev->blink_delay_on, &led_cdev->blink_delay_off); + if (rc) + goto err_out_delayoff; led_cdev->activated = true; return; +err_out_delayoff: + device_remove_file(led_cdev->dev, &dev_attr_delay_off); err_out_delayon: device_remove_file(led_cdev->dev, &dev_attr_delay_on); } diff --git a/include/linux/leds.h b/include/linux/leds.h index 9a2b000..356b8d1 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -47,6 +47,10 @@ struct led_classdev { #define SET_BRIGHTNESS_ASYNC (1 << 21) #define SET_BRIGHTNESS_SYNC (1 << 22) #define LED_DEV_CAP_FLASH (1 << 23) +#define LED_BRIGHTNESS_SLOW (1 << 24) + +/* safe period value for slow leds is 10mS */ +#define LED_SLOW_MIN_PERIOD 10 /* Set LED brightness level */ /* Must not sleep, use a workqueue if needed */ @@ -127,7 +131,7 @@ extern void led_classdev_resume(struct led_classdev *led_cdev); * led_cdev->brightness_set() will not stop the blinking, * use led_classdev_brightness_set() instead. */ -extern void led_blink_set(struct led_classdev *led_cdev, +extern int led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on, unsigned long *delay_off); /** @@ -144,7 +148,7 @@ extern void led_blink_set(struct led_classdev *led_cdev, * 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, +extern int led_blink_set_oneshot(struct led_classdev *led_cdev, unsigned long *delay_on, unsigned long *delay_off, int invert); -- 2.1.0