From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 390911714A1; Thu, 15 Aug 2024 13:55:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723730133; cv=none; b=R/BC7QWXH5uwjeuH/8/qzmPuvXD/2XWZGUOePkHV7Xf+SHgQoiBImsfbOfccDVSD132RjxBHPOOxd6XwteFHyBB2ElIHqGtHYiwXXUr0O7YGs9ETyGYDqotU+9GM8noOHE1iT4jN0lggfM5e926KAHeEaerhctGXkv52L4xmqbY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723730133; c=relaxed/simple; bh=/Xaxb8MLZMu7TaB7gnp/oDkO/KRfLBJl94etI2CEFjY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rCbH0gsNblfxVTEPwq+fVte9aS4kAuaYcksqY4A2IF7AKBbnh7gVwAvzZMxuu1dqBYO98iHuJdhjqyW9cuIuzcucuCO7Y1RJRb2KRZyIorKlijTqgmB9JYazOLZbmW7swK1Lh6KJDgtMmA2+O5Om4HYdw4ibq6xMNX71XVfle80= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=GLu2Ym/O; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="GLu2Ym/O" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B2F2CC32786; Thu, 15 Aug 2024 13:55:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1723730133; bh=/Xaxb8MLZMu7TaB7gnp/oDkO/KRfLBJl94etI2CEFjY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GLu2Ym/O88es8g1xM4MzSTZE+XEej2K9tadJRAydtfxklXN/9zWlejOp6skAspJUO 8A031M8A+vmCZ0RzN/86Lu3HtvmUq5kKD37WwUGwVKttenp4UE2syFqj9bcgnQz6wk jQswj8EGbgk8kh3W2SP2Z5RYf9awQ19fEnXMGqls= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Heiner Kallweit , Takashi Iwai , Lee Jones , Sasha Levin Subject: [PATCH 5.15 314/484] leds: trigger: Store brightness set by led_trigger_event() Date: Thu, 15 Aug 2024 15:22:52 +0200 Message-ID: <20240815131953.532594428@linuxfoundation.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240815131941.255804951@linuxfoundation.org> References: <20240815131941.255804951@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Heiner Kallweit [ Upstream commit 822c91e72eac568ed8d83765634f00decb45666c ] If a simple trigger is assigned to a LED, then the LED may be off until the next led_trigger_event() call. This may be an issue for simple triggers with rare led_trigger_event() calls, e.g. power supply charging indicators (drivers/power/supply/power_supply_leds.c). Therefore persist the brightness value of the last led_trigger_event() call and use this value if the trigger is assigned to a LED. In addition add a getter for the trigger brightness value. Signed-off-by: Heiner Kallweit Reviewed-by: Takashi Iwai Link: https://lore.kernel.org/r/b1358b25-3f30-458d-8240-5705ae007a8a@gmail.com Signed-off-by: Lee Jones Stable-dep-of: ab477b766edd ("leds: triggers: Flush pending brightness before activating trigger") Signed-off-by: Sasha Levin --- drivers/leds/led-triggers.c | 6 ++++-- include/linux/leds.h | 15 +++++++++++++++ 2 files changed, 19 insertions(+), 2 deletions(-) diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c index dddfc301d3414..cdb446cb84af2 100644 --- a/drivers/leds/led-triggers.c +++ b/drivers/leds/led-triggers.c @@ -193,11 +193,11 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) spin_unlock(&trig->leddev_list_lock); led_cdev->trigger = trig; + ret = 0; if (trig->activate) ret = trig->activate(led_cdev); else - ret = 0; - + led_set_brightness(led_cdev, trig->brightness); if (ret) goto err_activate; @@ -372,6 +372,8 @@ void led_trigger_event(struct led_trigger *trig, if (!trig) return; + trig->brightness = brightness; + rcu_read_lock(); list_for_each_entry_rcu(led_cdev, &trig->led_cdevs, trig_list) led_set_brightness(led_cdev, brightness); diff --git a/include/linux/leds.h b/include/linux/leds.h index 2bbff7519b731..79ab2dfd3c72f 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -356,6 +356,9 @@ struct led_trigger { int (*activate)(struct led_classdev *led_cdev); void (*deactivate)(struct led_classdev *led_cdev); + /* Brightness set by led_trigger_event */ + enum led_brightness brightness; + /* LED-private triggers have this set */ struct led_hw_trigger_type *trigger_type; @@ -409,6 +412,12 @@ static inline void *led_get_trigger_data(struct led_classdev *led_cdev) return led_cdev->trigger_data; } +static inline enum led_brightness +led_trigger_get_brightness(const struct led_trigger *trigger) +{ + return trigger ? trigger->brightness : LED_OFF; +} + #define module_led_trigger(__led_trigger) \ module_driver(__led_trigger, led_trigger_register, \ led_trigger_unregister) @@ -445,6 +454,12 @@ static inline void *led_get_trigger_data(struct led_classdev *led_cdev) return NULL; } +static inline enum led_brightness +led_trigger_get_brightness(const struct led_trigger *trigger) +{ + return LED_OFF; +} + #endif /* CONFIG_LEDS_TRIGGERS */ /* Trigger specific functions */ -- 2.43.0