From patchwork Mon May 25 11:41:41 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 476145 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3E0741402C0 for ; Mon, 25 May 2015 21:42:39 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=a25EcNS7; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752456AbbEYLmd (ORCPT ); Mon, 25 May 2015 07:42:33 -0400 Received: from mail-la0-f51.google.com ([209.85.215.51]:35173 "EHLO mail-la0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752441AbbEYLm3 (ORCPT ); Mon, 25 May 2015 07:42:29 -0400 Received: by labbd9 with SMTP id bd9so47906679lab.2; Mon, 25 May 2015 04:42:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=T5TKZ/PX+gwTW272dnAmJ5x7n4vGAdIrycc/G/13KUw=; b=a25EcNS7xe4KScChsTh/aHD9rx4j4DibBiBPGmCpNaVPpKlWmm/BJJBtPWgEoBdRWH ezUVZ4HgojVVrn6yHVQCnc2U1HVPdhO9hWNkbBpt9Im8oxnk4UxaEQdhFTqp2OLn94Hb hy6ITXQ37fsK3aLj8GU0JgMMweCtni5SK6ayd8Zyr7tYsTuD8TBNPjkhbKGwRHsQ3IrF XTwareXPjpEZs2E3w67umsKLFMZc0+fbhsm+tabZ7q1SNSdZXS0hZrRqSASbDh22b+Rf nkrkIXRcY667FDfzrX1YbgUmIvtenDk49VVgPTBEVLhEg7htFD4z6xlkw15u6QE7BjeM 0+UA== X-Received: by 10.152.9.66 with SMTP id x2mr17931608laa.36.1432554147930; Mon, 25 May 2015 04:42:27 -0700 (PDT) Received: from anuminas.rup.mentorg.com (ppp89-110-13-209.pppoe.avangarddsl.ru. [89.110.13.209]) by mx.google.com with ESMTPSA id si3sm2315895lbb.32.2015.05.25.04.42.25 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 25 May 2015 04:42:26 -0700 (PDT) From: Dmitry Eremin-Solenikov To: Russell King , Daniel Mack , Robert Jarzmik , Linus Walleij , Alexandre Courbot , Dmitry Torokhov , Samuel Ortiz , Lee Jones , Mark Brown , Jingoo Han , Liam Girdwood , Andrea Adami Cc: linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-input@vger.kernel.org, linux-spi@vger.kernel.org, alsa-devel@alsa-project.org Subject: [PATCH v4 06/18] video: backlight: add new locomo backlight driver Date: Mon, 25 May 2015 14:41:41 +0300 Message-Id: <1432554113-26280-7-git-send-email-dbaryshkov@gmail.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1432554113-26280-1-git-send-email-dbaryshkov@gmail.com> References: <1432554113-26280-1-git-send-email-dbaryshkov@gmail.com> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Add new simple backlight driver - it cares only about PWM/frontlight part of LoCoMo, it does not touch TFT settings and does not export TFT power control. Signed-off-by: Dmitry Eremin-Solenikov --- drivers/video/backlight/Kconfig | 6 +- drivers/video/backlight/Makefile | 2 +- drivers/video/backlight/locomo_bl.c | 153 ++++++++++++++++++++++++++++++++++++ 3 files changed, 157 insertions(+), 4 deletions(-) create mode 100644 drivers/video/backlight/locomo_bl.c diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 2d9923a..6c093e2 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -217,12 +217,12 @@ config BACKLIGHT_LM3533 levels. config BACKLIGHT_LOCOMO - tristate "Sharp LOCOMO LCD/Backlight Driver" - depends on SHARP_LOCOMO + tristate "Sharp LOCOMO Backlight Driver" + depends on MFD_LOCOMO default y help If you have a Sharp Zaurus SL-5500 (Collie) or SL-5600 (Poodle) say y to - enable the LCD/backlight driver. + enable the backlight driver. config BACKLIGHT_OMAP1 tristate "OMAP1 PWL-based LCD Backlight" diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index d67073f..2de73d2 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -39,7 +39,7 @@ obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO) += ipaq_micro_bl.o obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o obj-$(CONFIG_BACKLIGHT_LM3630A) += lm3630a_bl.o obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o -obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o +obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomo_bl.o obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o obj-$(CONFIG_BACKLIGHT_LP8788) += lp8788_bl.o obj-$(CONFIG_BACKLIGHT_LV5207LP) += lv5207lp.o diff --git a/drivers/video/backlight/locomo_bl.c b/drivers/video/backlight/locomo_bl.c new file mode 100644 index 0000000..cc60022 --- /dev/null +++ b/drivers/video/backlight/locomo_bl.c @@ -0,0 +1,153 @@ +/* + * Backlight control code for Sharp Zaurus SL-5500 + * + * Copyright 2005 John Lenz + * Maintainer: Pavel Machek (unless John wants to :-) + * GPL v2 + * + * This driver assumes single CPU. That's okay, because collie is + * slightly old hardware, and no one is going to retrofit second CPU to + * old PDA. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +struct locomo_bl { + struct regmap *regmap; + int current_intensity; + struct gpio_desc *fl_vr; +}; + +static const struct { + u16 duty, bpwf; + bool vr; +} locomo_bl_pwm[] = { + { 0, 161, false }, + { 117, 161, false }, + { 163, 148, false }, + { 194, 161, false }, + { 194, 161, true }, +}; + +static int locomo_bl_set_intensity(struct backlight_device *bd) +{ + int intensity = bd->props.brightness; + struct locomo_bl *bl = dev_get_drvdata(&bd->dev); + + if (bd->props.power != FB_BLANK_UNBLANK) + intensity = 0; + if (bd->props.fb_blank != FB_BLANK_UNBLANK) + intensity = 0; + if (bd->props.state & BL_CORE_SUSPENDED) + intensity = 0; + + gpiod_set_value(bl->fl_vr, locomo_bl_pwm[intensity].vr); + + regmap_write(bl->regmap, LOCOMO_ALS, locomo_bl_pwm[intensity].bpwf); + usleep_range(100, 200); + regmap_write(bl->regmap, LOCOMO_ALD, locomo_bl_pwm[intensity].duty); + usleep_range(100, 200); + regmap_write(bl->regmap, LOCOMO_ALS, locomo_bl_pwm[intensity].bpwf | + LOCOMO_ALS_EN); + + bl->current_intensity = intensity; + if (bd->props.state & BL_CORE_SUSPENDED) + regmap_write(bl->regmap, LOCOMO_ALS, 0x00); + + return 0; +} + +static int locomo_bl_get_intensity(struct backlight_device *bd) +{ + struct locomo_bl *bl = dev_get_drvdata(&bd->dev); + + return bl->current_intensity; +} + +static const struct backlight_ops locomo_bl_ops = { + .options = BL_CORE_SUSPENDRESUME, + .get_brightness = locomo_bl_get_intensity, + .update_status = locomo_bl_set_intensity, +}; + +static int locomo_bl_probe(struct platform_device *dev) +{ + struct backlight_properties props; + struct locomo_bl *bl; + struct backlight_device *locomo_bl_device; + + bl = devm_kmalloc(&dev->dev, sizeof(struct locomo_bl), GFP_KERNEL); + if (!bl) + return -ENOMEM; + + bl->regmap = dev_get_regmap(dev->dev.parent, NULL); + if (!bl->regmap) + return -ENODEV; + + bl->fl_vr = devm_gpiod_get(&dev->dev, "flvr", GPIOD_OUT_LOW); + if (IS_ERR(bl->fl_vr)) + return PTR_ERR(bl->fl_vr); + + regmap_write(bl->regmap, LOCOMO_ALS, 0); + regmap_write(bl->regmap, LOCOMO_ALD, 0); + + memset(&props, 0, sizeof(struct backlight_properties)); + props.type = BACKLIGHT_RAW; + props.max_brightness = ARRAY_SIZE(locomo_bl_pwm) - 1; + props.brightness = props.max_brightness / 2; + locomo_bl_device = devm_backlight_device_register(&dev->dev, + "locomo-bl", + &dev->dev, bl, + &locomo_bl_ops, &props); + + if (IS_ERR(locomo_bl_device)) + return PTR_ERR(locomo_bl_device); + + platform_set_drvdata(dev, locomo_bl_device); + + /* Set up frontlight so that screen is readable */ + backlight_update_status(locomo_bl_device); + + return 0; +} + +static void locomo_bl_shutdown(struct platform_device *dev) +{ + struct backlight_device *locomo_bl_device = platform_get_drvdata(dev); + + locomo_bl_device->props.brightness = 0; + locomo_bl_device->props.power = 0; + locomo_bl_set_intensity(locomo_bl_device); +} + +static int locomo_bl_remove(struct platform_device *dev) +{ + locomo_bl_shutdown(dev); + + return 0; +} + +static struct platform_driver locomo_bl_driver = { + .driver = { + .name = "locomo-backlight", + }, + .probe = locomo_bl_probe, + .remove = locomo_bl_remove, + /* Turn off bl on power off/reboot */ + .shutdown = locomo_bl_shutdown, +}; + +module_platform_driver(locomo_bl_driver); + +MODULE_AUTHOR("John Lenz "); +MODULE_AUTHOR("Pavel Machek "); +MODULE_DESCRIPTION("LoCoMo Backlight driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:locomo-backlight");