From patchwork Thu Feb 6 15:30:26 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 863672 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E3E5522577F; Thu, 6 Feb 2025 15:40:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.130 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738856449; cv=none; b=X0BPQ6u5cjVn+7BRDz/jl2uQ7SBltG8iAGiqc5YI2zdiHPOnTPABnadaMKaODcCNleFgyGvFgE7Rc/4M5n7V9pwK+DN3H6g9tWWmr7m1NaJ5YpXsynpOy53E/fDOfL+8/gMeyweEGs2VcRLN60azyphQ5j7EkuVnVN/DeiQw3xU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738856449; c=relaxed/simple; bh=mQLciDWkIC8+buA4vhMfNSDIL06Oh9J3W/mFzbx8s3w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Pv4vpgOkwhFRZspDKUNiccz4KgHFyRUjppjza418ab2IaqTWFxu2AAz4XLawd7ywgq5H0SkofQsHOOpOjH05wbnVNS+fANvdxoFDfk5cyDj6SZtimk62UCKLGETrCet2iguo0HlV6Z3Ie0WJTuD+xJjKpPRVcEzKf3rBIfxnI18= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de; spf=pass smtp.mailfrom=suse.de; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=jiAqai6e; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=AS3bldt3; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=jiAqai6e; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=AS3bldt3; arc=none smtp.client-ip=195.135.223.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="jiAqai6e"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="AS3bldt3"; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="jiAqai6e"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="AS3bldt3" Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 280602115F; Thu, 6 Feb 2025 15:40:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1738856446; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=E3XUtLPaqLGIYCmzV8GNcFujB/Skf7MzzsqQR1UIaXo=; b=jiAqai6eQD64hkxSM8Q88uQ6xlGs4LeTNZz9Ur1nzc7dekU5DvwUOrS2GH2KttA/XfrJQn PIKlkuqly8paOu8FXEdgwta5gt3bM+Y6xWPtJgz8mXmjxQbvb9UhmENKkMg0OotuNoW4Uq xe27EP06VS7KgT8DdLsnblR99NyLVjw= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1738856446; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=E3XUtLPaqLGIYCmzV8GNcFujB/Skf7MzzsqQR1UIaXo=; b=AS3bldt3OBsYK1Q4RqdXamim7zvqvdxXZkbcCd5R1VV12G2D7PFqW/uEv2NEZkfyRgCzsN 7mKGW6IjBOXm84Bg== Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1738856446; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=E3XUtLPaqLGIYCmzV8GNcFujB/Skf7MzzsqQR1UIaXo=; b=jiAqai6eQD64hkxSM8Q88uQ6xlGs4LeTNZz9Ur1nzc7dekU5DvwUOrS2GH2KttA/XfrJQn PIKlkuqly8paOu8FXEdgwta5gt3bM+Y6xWPtJgz8mXmjxQbvb9UhmENKkMg0OotuNoW4Uq xe27EP06VS7KgT8DdLsnblR99NyLVjw= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1738856446; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=E3XUtLPaqLGIYCmzV8GNcFujB/Skf7MzzsqQR1UIaXo=; b=AS3bldt3OBsYK1Q4RqdXamim7zvqvdxXZkbcCd5R1VV12G2D7PFqW/uEv2NEZkfyRgCzsN 7mKGW6IjBOXm84Bg== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id D327E13A7F; Thu, 6 Feb 2025 15:40:45 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id iCRdMv3XpGf4PAAAD6G6ig (envelope-from ); Thu, 06 Feb 2025 15:40:45 +0000 From: Thomas Zimmermann To: pavel@ucw.cz, lee@kernel.org, danielt@kernel.org, jingoohan1@gmail.com, deller@gmx.de, simona@ffwll.ch Cc: linux-leds@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, Thomas Zimmermann Subject: [PATCH 07/13] backlight: lcd: Maintain global list of lcd devices Date: Thu, 6 Feb 2025 16:30:26 +0100 Message-ID: <20250206154033.697495-8-tzimmermann@suse.de> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250206154033.697495-1-tzimmermann@suse.de> References: <20250206154033.697495-1-tzimmermann@suse.de> Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Score: -6.80 X-Spamd-Result: default: False [-6.80 / 50.00]; REPLY(-4.00)[]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,suse.de:email]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; FROM_EQ_ENVFROM(0.00)[]; FREEMAIL_TO(0.00)[ucw.cz,kernel.org,gmail.com,gmx.de,ffwll.ch]; RCPT_COUNT_SEVEN(0.00)[10]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_TLS_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; R_RATELIMIT(0.00)[to_ip_from(RLqirfcw6gnbcr9a9yhi49fhi6)]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FREEMAIL_ENVRCPT(0.00)[gmail.com,gmx.de] X-Spam-Flag: NO X-Spam-Level: Maintain a list of lcd devices. This will replace the fbdev notifiers that all lcd devices currently subscribe to. Signed-off-by: Thomas Zimmermann --- drivers/video/backlight/lcd.c | 11 +++++++++++ include/linux/lcd.h | 5 +++++ 2 files changed, 16 insertions(+) diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c index 3267acf8dc5b..95a371b3e8a4 100644 --- a/drivers/video/backlight/lcd.c +++ b/drivers/video/backlight/lcd.c @@ -18,6 +18,9 @@ #include #include +static struct list_head lcd_dev_list; +static struct mutex lcd_dev_list_mutex; + #if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \ defined(CONFIG_LCD_CLASS_DEVICE_MODULE)) static int to_lcd_power(int fb_blank) @@ -251,6 +254,10 @@ struct lcd_device *lcd_device_register(const char *name, struct device *parent, return ERR_PTR(rc); } + mutex_lock(&lcd_dev_list_mutex); + list_add(&new_ld->entry, &lcd_dev_list); + mutex_unlock(&lcd_dev_list_mutex); + return new_ld; } EXPORT_SYMBOL(lcd_device_register); @@ -266,6 +273,10 @@ void lcd_device_unregister(struct lcd_device *ld) if (!ld) return; + mutex_lock(&lcd_dev_list_mutex); + list_del(&ld->entry); + mutex_unlock(&lcd_dev_list_mutex); + mutex_lock(&ld->ops_lock); ld->ops = NULL; mutex_unlock(&ld->ops_lock); diff --git a/include/linux/lcd.h b/include/linux/lcd.h index c3ccdff4519a..195b95edb13f 100644 --- a/include/linux/lcd.h +++ b/include/linux/lcd.h @@ -82,6 +82,11 @@ struct lcd_device { /* The framebuffer notifier block */ struct notifier_block fb_notif; + /** + * @entry: List entry of all registered lcd devices + */ + struct list_head entry; + struct device dev; };