From patchwork Tue Oct 28 00:01:58 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 404013 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 9A6E5140077 for ; Tue, 28 Oct 2014 11:02:42 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752996AbaJ1ACl (ORCPT ); Mon, 27 Oct 2014 20:02:41 -0400 Received: from mail-wi0-f172.google.com ([209.85.212.172]:58429 "EHLO mail-wi0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752945AbaJ1ACi (ORCPT ); Mon, 27 Oct 2014 20:02:38 -0400 Received: by mail-wi0-f172.google.com with SMTP id d1so4309715wiv.5 for ; Mon, 27 Oct 2014 17:02:36 -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=BWm32NmLMSC1Kuwd3W2+zuRx5f9xM8ao/gTgossNOjw=; b=CU57EIlyZgVtpTdRpXnj3o9Newf+0YCa+i94BPZWS4vCq442Nofn+MM4FZZ+NZGjEi N65UIbe/04WbKqzCn9dCg2ejOsWJLqJ8sm4vvy0CCYRu1SOJjmMLr7+nk16Hm2ZYWSoD PkeXjIhWbfBPTjEkXez6wfBdHGX75HAKN1//NZlT94sQlaAAYGgpE1a0x7l9RMN91PO7 FfMPy2zM+sx1ukfpG07Gn7P/uwvdyBbhhQewtgI1pOG+rgeqUpGZbUB2st+fRT4g9K5D j/awrbXd5XrBtgo5ZbvTSSrG9H/StNliSlyBMcYOHdTXGQykUVewqIwmAuL/mAAlkNcr XfeQ== X-Received: by 10.194.57.169 with SMTP id j9mr24904108wjq.33.1414454556484; Mon, 27 Oct 2014 17:02:36 -0700 (PDT) Received: from fangorn.rup.mentorg.com (nat-min.mentorg.com. [139.181.32.34]) by mx.google.com with ESMTPSA id fq1sm13495340wib.12.2014.10.27.17.02.34 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 27 Oct 2014 17:02:35 -0700 (PDT) From: Dmitry Eremin-Solenikov To: linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-input@vger.kernel.org, linux-leds@vger.kernel.org, linux-spi@vger.kernel.org, linux-fbdev@vger.kernel.org, alsa-devel@alsa-project.org Cc: Andrea Adami , Russell King , Daniel Mack , Haojian Zhuang , Robert Jarzmik , Linus Walleij , Alexandre Courbot , Dmitry Torokhov , Bryan Wu , Richard Purdie , Samuel Ortiz , Lee Jones , Mark Brown , Jingoo Han , Liam Girdwood Subject: [PATCH 05/15] video: backlight: add new locomo backlight driver Date: Tue, 28 Oct 2014 03:01:58 +0300 Message-Id: <1414454528-24240-6-git-send-email-dbaryshkov@gmail.com> X-Mailer: git-send-email 2.1.1 In-Reply-To: <1414454528-24240-1-git-send-email-dbaryshkov@gmail.com> References: <1414454528-24240-1-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 | 171 ++++++++++++++++++++++++++++++++++++ 3 files changed, 175 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 8d03924..03b77b33 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -218,12 +218,12 @@ 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 fcd50b73..2a61b7e 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..cec1b51 --- /dev/null +++ b/drivers/video/backlight/locomo_bl.c @@ -0,0 +1,171 @@ +/* + * 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 +#include + +struct locomo_bl { + void __iomem *regs; + int current_intensity; + int gpio_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; + + gpio_set_value(bl->gpio_fl_vr, locomo_bl_pwm[intensity].vr); + + writew(locomo_bl_pwm[intensity].bpwf, bl->regs + LOCOMO_ALS); + udelay(100); + writew(locomo_bl_pwm[intensity].duty, bl->regs + LOCOMO_ALD); + udelay(100); + writew(locomo_bl_pwm[intensity].bpwf | LOCOMO_ALC_EN, + bl->regs + LOCOMO_ALS); + + bl->current_intensity = intensity; + if (bd->props.state & BL_CORE_SUSPENDED) + writew(0x00, bl->regs + LOCOMO_ALS); + + 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 resource *res; + struct locomo_bl_platform_data *pdata; + struct locomo_bl *bl; + struct backlight_device *locomo_bl_device; + int rc; + + bl = devm_kmalloc(&dev->dev, sizeof(struct locomo_bl), GFP_KERNEL); + if (!bl) + return -ENOMEM; + + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; + bl->regs = devm_ioremap_resource(&dev->dev, res); + if (!bl->regs) + return -EINVAL; + + pdata = dev_get_platdata(&dev->dev); + if (!pdata) + return -EINVAL; + + bl->gpio_fl_vr = pdata->gpio_fl_vr; + rc = devm_gpio_request_one(&dev->dev, bl->gpio_fl_vr, + GPIOF_OUT_INIT_LOW, "FL VR"); + if (rc) + return rc; + + writew(0, bl->regs + LOCOMO_ALS); + writew(0, bl->regs + LOCOMO_ALD); + + 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 = backlight_device_register("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 int locomo_bl_remove(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); + + backlight_device_unregister(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 struct platform_driver locomo_bl_driver = { + .driver = { + .name = "locomo-backlight", + .owner = THIS_MODULE, + }, + .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 , Pavel Machek "); +MODULE_DESCRIPTION("Collie Backlight driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:locomo-backlight");