From patchwork Wed Dec 3 16:06:43 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacek Anaszewski X-Patchwork-Id: 5432211 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 73629BEEA8 for ; Wed, 3 Dec 2014 16:17:09 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2F01D20379 for ; Wed, 3 Dec 2014 16:17:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AE25F20256 for ; Wed, 3 Dec 2014 16:17:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752778AbaLCQIK (ORCPT ); Wed, 3 Dec 2014 11:08:10 -0500 Received: from mailout2.samsung.com ([203.254.224.25]:26730 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752106AbaLCQIF (ORCPT ); Wed, 3 Dec 2014 11:08:05 -0500 Received: from epcpsbgm2.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout2.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NG000E02KTF8B90@mailout2.samsung.com>; Thu, 04 Dec 2014 01:08:04 +0900 (KST) X-AuditID: cbfee61b-f79d76d0000024d6-67-547f356399e0 Received: from epmmp2 ( [203.254.227.17]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id 10.BE.09430.3653F745; Thu, 04 Dec 2014 01:08:03 +0900 (KST) Received: from AMDC2362.DIGITAL.local ([106.120.53.23]) by mmp2.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0NG000LO7KRKV100@mmp2.samsung.com>; Thu, 04 Dec 2014 01:08:03 +0900 (KST) From: Jacek Anaszewski To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Cc: kyungmin.park@samsung.com, b.zolnierkie@samsung.com, pavel@ucw.cz, cooloney@gmail.com, rpurdie@rpsys.net, sakari.ailus@iki.fi, s.nawrocki@samsung.com, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, Jacek Anaszewski Subject: [PATCH/RFC v9 08/19] leds: Add driver for AAT1290 current regulator Date: Wed, 03 Dec 2014 17:06:43 +0100 Message-id: <1417622814-10845-9-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1417622814-10845-1-git-send-email-j.anaszewski@samsung.com> References: <1417622814-10845-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrOLMWRmVeSWpSXmKPExsVy+t9jQd1k0/oQg4sPDCw2zljPanF050Qm i/43C1ktzr1ayWjRe/U5o8XZpjfsFpd3zWGz2PpmHaNFz4atrBZLr19ksrh76iibxYTpa1ks WvceYbfYvespq8XhN+2sFmf2r2RzEPBYM28No8flvl4mj52z7rJ7rFz+hc3j8NeFLB6bVnWy eeyZ/4PVo2/LKkaPFau/s3t83iQXwBXFZZOSmpNZllqkb5fAlXH+fgtLQU96RcPCj8wNjOdD uxg5OSQETCTWP13MCGGLSVy4t56ti5GLQ0hgOqPE7tv7mCGcdiaJC7eWsoJUsQkYSvx88Zqp i5GDQ0QgWuLSsXqQMLPAQSaJW4/LQWxhAR+JQ+/uM4HYLAKqEmeffQRr5RXwkJi++xcjSKuE gILEnEk2IGFOAU+Jpz/us4OEhYBKDk70n8DIu4CRYRWjaGpBckFxUnqukV5xYm5xaV66XnJ+ 7iZGcHA/k97BuKrB4hCjAAejEg+vRVxdiBBrYllxZe4hRgkOZiUR3mffgEK8KYmVValF+fFF pTmpxYcYpTlYlMR5b9zMDRESSE8sSc1OTS1ILYLJMnFwSjUwLuV3s4m859G67sKLKdKfyzau j9/1Sf9Ta1T+9ob8/LuGLxJyw/o2LuY+d+7HXw4bb5tWzUCvOJYAdisOceZedQHf8CahV6LH vb03/Y94sGgt77PjH7tP3BZcoruRfWnTV5FTkyYtUmnew/qbY/funxr1Xo3zvSZNt2phPpj1 vD1tZ++TG41blFiKMxINtZiLihMB2Zbv/2oCAAA= Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds a driver for the 1.5A Step-Up Current Regulator for Flash LEDs. The device is programmed through a Skyworks proprietary AS2Cwire serial digital interface. Signed-off-by: Jacek Anaszewski Acked-by: Kyungmin Park Cc: Bryan Wu Cc: Richard Purdie --- drivers/leds/Kconfig | 7 + drivers/leds/Makefile | 1 + drivers/leds/leds-aat1290.c | 413 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 421 insertions(+) create mode 100644 drivers/leds/leds-aat1290.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 2e66d55..ec4b78c 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -39,6 +39,13 @@ config LEDS_88PM860X This option enables support for on-chip LED drivers found on Marvell Semiconductor 88PM8606 PMIC. +config LEDS_AAT1290 + tristate "LED support for the AAT1290" + depends on LEDS_CLASS_FLASH + depends on OF + help + This option enables support for the LEDs on the AAT1290. + config LEDS_LM3530 tristate "LCD Backlight driver for LM3530" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 57ca62b..b802251 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o # LED Platform Drivers obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o +obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o diff --git a/drivers/leds/leds-aat1290.c b/drivers/leds/leds-aat1290.c new file mode 100644 index 0000000..15d969b --- /dev/null +++ b/drivers/leds/leds-aat1290.c @@ -0,0 +1,413 @@ +/* + * LED Flash class driver for the AAT1290 + * 1.5A Step-Up Current Regulator for Flash LEDs + * + * Copyright (C) 2014, Samsung Electronics Co., Ltd. + * Author: Jacek Anaszewski + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define AAT1290_MOVIE_MODE_CURRENT_ADDR 17 +#define AAT1290_FLASH_SAFETY_TIMER_ADDR 18 +#define AAT1290_MOVIE_MODE_CONFIG_ADDR 19 +#define AAT1290_MM_CURRENT_RATIO_ADDR 20 +#define AAT1290_LATCH_TIME_US 500 +#define AAT1290_EN_SET_TICK_TIME_US 1 +#define AAT1290_MOVIE_MODE_OFF 1 +#define AAT1290_MOVIE_MODE_ON 3 +#define AAT1290_MAX_MM_CURR_PERCENT_0 16 +#define AAT1290_MAX_MM_CURR_PERCENT_100 1 +#define AAT1290_FLASH_TM_NUM_LEVELS 16 + +#define AAT1290_MM_TO_FL_1_92 1 +#define AAT1290_MM_TO_FL_3_7 2 +#define AAT1290_MM_TO_FL_5_5 3 +#define AAT1290_MM_TO_FL_7_3 4 +#define AAT1290_MM_TO_FL_9 5 +#define AAT1290_MM_TO_FL_10_7 6 +#define AAT1290_MM_TO_FL_12_4 7 +#define AAT1290_MM_TO_FL_14 8 +#define AAT1290_MM_TO_FL_15_9 9 +#define AAT1290_MM_TO_FL_17_5 10 +#define AAT1290_MM_TO_FL_19_1 11 +#define AAT1290_MM_TO_FL_20_8 12 +#define AAT1290_MM_TO_FL_22_4 13 +#define AAT1290_MM_TO_FL_24 14 +#define AAT1290_MM_TO_FL_25_6 15 +#define AAT1290_MM_TO_FL_OFF 16 + +struct aat1290_led_settings { + struct led_flash_setting torch_brightness; + struct led_flash_setting flash_brightness; + struct led_flash_setting flash_timeout; +}; + +struct aat1290_led { + struct platform_device *pdev; + struct mutex lock; + + struct led_classdev_flash ldev; + + int flen_gpio; + int en_set_gpio; + + u32 max_flash_tm; + bool movie_mode; + + char *label; + unsigned int torch_brightness; + unsigned int flash_timeout; + struct work_struct work_brightness_set; +}; + +static struct aat1290_led *ldev_to_led(struct led_classdev_flash *ldev) +{ + return container_of(ldev, struct aat1290_led, ldev); +} + +static void aat1290_as2cwire_write(struct aat1290_led *led, int addr, int value) +{ + int i; + + gpio_set_value(led->flen_gpio, 0); + gpio_set_value(led->en_set_gpio, 0); + + udelay(10); + + /* write address */ + for (i = 0; i < addr; ++i) { + udelay(AAT1290_EN_SET_TICK_TIME_US); + gpio_set_value(led->en_set_gpio, 0); + udelay(AAT1290_EN_SET_TICK_TIME_US); + gpio_set_value(led->en_set_gpio, 1); + } + + udelay(AAT1290_LATCH_TIME_US); + + /* write data */ + for (i = 0; i < value; ++i) { + udelay(AAT1290_EN_SET_TICK_TIME_US); + gpio_set_value(led->en_set_gpio, 0); + udelay(AAT1290_EN_SET_TICK_TIME_US); + gpio_set_value(led->en_set_gpio, 1); + } + + udelay(AAT1290_LATCH_TIME_US); +} + +static void aat1290_set_flash_safety_timer(struct aat1290_led *led, + unsigned int micro_sec) +{ + struct led_classdev_flash *flash = &led->ldev; + struct led_flash_setting *flash_tm = &flash->timeout; + int flash_tm_reg = AAT1290_FLASH_TM_NUM_LEVELS - + (micro_sec / flash_tm->step) + 1; + + aat1290_as2cwire_write(led, AAT1290_FLASH_SAFETY_TIMER_ADDR, + flash_tm_reg); +} + +static void aat1290_brightness_set(struct aat1290_led *led, + enum led_brightness brightness) +{ + mutex_lock(&led->lock); + + if (brightness == 0) { + gpio_set_value(led->flen_gpio, 0); + gpio_set_value(led->en_set_gpio, 0); + goto unlock; + } + + if (!led->movie_mode) { + aat1290_as2cwire_write(led, AAT1290_MM_CURRENT_RATIO_ADDR, + AAT1290_MM_TO_FL_1_92); + led->movie_mode = true; + } + + aat1290_as2cwire_write(led, AAT1290_MOVIE_MODE_CURRENT_ADDR, + AAT1290_MAX_MM_CURR_PERCENT_0 - brightness); + aat1290_as2cwire_write(led, AAT1290_MOVIE_MODE_CONFIG_ADDR, + AAT1290_MOVIE_MODE_ON); +unlock: + mutex_unlock(&led->lock); +} + +/* LED subsystem callbacks */ + +static void aat1290_brightness_set_work(struct work_struct *work) +{ + struct aat1290_led *led = + container_of(work, struct aat1290_led, work_brightness_set); + + aat1290_brightness_set(led, led->torch_brightness); +} + +static void aat1290_led_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct led_classdev_flash *flash = lcdev_to_flash(led_cdev); + struct aat1290_led *led = ldev_to_led(flash); + + led->torch_brightness = brightness; + schedule_work(&led->work_brightness_set); +} + +static int aat1290_led_brightness_set_sync(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct led_classdev_flash *flash = lcdev_to_flash(led_cdev); + struct aat1290_led *led = ldev_to_led(flash); + + aat1290_brightness_set(led, brightness); + + return 0; +} + +static int aat1290_led_flash_strobe_set(struct led_classdev_flash *flash, + bool state) + +{ + struct aat1290_led *led = ldev_to_led(flash); + struct led_classdev *led_cdev = &flash->led_cdev; + struct led_flash_setting *timeout = &flash->timeout; + + mutex_lock(&led->lock); + + if (state == 0) { + gpio_set_value(led->flen_gpio, 0); + gpio_set_value(led->en_set_gpio, 0); + goto unlock; + } + + aat1290_set_flash_safety_timer(led, timeout->val); + + /* + * To reenter movie mode after a flash event the part + * must be cycled off and back on to reset the movie + * mode and reprogrammed via the AS2Cwire. Therefore + * the brightness value needs to be updated here to + * reflect the actual state. + */ + led_cdev->brightness = 0; + led->movie_mode = false; + + gpio_set_value(led->flen_gpio, 1); + +unlock: + mutex_unlock(&led->lock); + + return 0; +} + +static int aat1290_led_flash_timeout_set(struct led_classdev_flash *flash, + u32 timeout) +{ + /* + * Don't do anything - flash timeout is cached in the led-class-flash + * core and will be applied in the strobe_set op, as writing the + * safety timer register spuriously turns the torch mode on. + */ + + return 0; +} + +static int aat1290_led_parse_dt(struct aat1290_led *led, + struct device *dev) +{ + int ret; + char *pname = "label"; + + ret = of_property_read_string(dev->of_node, pname, + (const char **) &led->label); + if (ret < 0) { + dev_err(dev, "Error reading %s Device Tree property (%d)\n", + pname, ret); + return ret; + } + + pname = "flash-timeout-microsec"; + + ret = of_property_read_u32(dev->of_node, pname, &led->max_flash_tm); + if (ret) { + dev_err(dev, "Error reading %s Device Tree property (%d)\n", + pname, ret); + return ret; + } + + return ret; +} + +static void aat1290_init_flash_settings(struct aat1290_led *led, + struct aat1290_led_settings *s) +{ + struct led_flash_setting *setting; + + /* Init flash intensity setting */ + setting = &s->torch_brightness; + /* + * Torch current is adjustable in logarithmic fashion and thus + * it is not possible to define fixed step in microamperes. + * Instead led brightness levels are used to make possible + * setting all the supported levels from V4L2 Flash sub-device. + */ + setting->min = 1; + setting->max = AAT1290_MAX_MM_CURR_PERCENT_0 - + AAT1290_MAX_MM_CURR_PERCENT_100; + setting->step = 1; + setting->val = setting->max; + + /* Init flash timeout setting */ + setting = &s->flash_timeout; + setting->min = led->max_flash_tm / AAT1290_FLASH_TM_NUM_LEVELS; + setting->max = setting->min * AAT1290_FLASH_TM_NUM_LEVELS; + setting->step = setting->min; + setting->val = setting->max; +} + +static const struct led_flash_ops flash_ops = { + .strobe_set = aat1290_led_flash_strobe_set, + .timeout_set = aat1290_led_flash_timeout_set, +}; + +static int aat1290_led_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *dev_node = pdev->dev.of_node; + struct aat1290_led *led; + struct led_classdev *led_cdev; + struct led_classdev_flash *flash; + struct aat1290_led_settings settings; + int flen_gpio, enset_gpio, ret; + + led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + led->pdev = pdev; + platform_set_drvdata(pdev, led); + + if (!dev_node) + return -ENXIO; + + flen_gpio = of_get_gpio(dev_node, 0); + if (gpio_is_valid(flen_gpio)) { + ret = gpio_request_one(flen_gpio, GPIOF_DIR_OUT, + "aat1290_flen"); + if (ret < 0) { + dev_err(dev, + "failed to request GPIO %d, error %d\n", + flen_gpio, ret); + goto error_gpio_flen; + } + } + led->flen_gpio = flen_gpio; + + enset_gpio = of_get_gpio(dev_node, 1); + if (gpio_is_valid(enset_gpio)) { + ret = gpio_request_one(enset_gpio, GPIOF_DIR_OUT, + "aat1290_en_set"); + if (ret < 0) { + dev_err(dev, + "failed to request GPIO %d, error %d\n", + enset_gpio, ret); + goto error_gpio_en_set; + } + } + led->en_set_gpio = enset_gpio; + + ret = aat1290_led_parse_dt(led, &pdev->dev); + if (ret < 0) + goto error_gpio_en_set; + + mutex_init(&led->lock); + + flash = &led->ldev; + + /* Init flash settings */ + aat1290_init_flash_settings(led, &settings); + + flash->timeout = settings.flash_timeout; + + /* Init led class */ + led_cdev = &flash->led_cdev; + led_cdev->name = led->label; + led_cdev->brightness_set = aat1290_led_brightness_set; + led_cdev->brightness_set_sync = aat1290_led_brightness_set_sync; + led_cdev->max_brightness = settings.torch_brightness.max; + led_cdev->flags |= LED_DEV_CAP_FLASH; + + INIT_WORK(&led->work_brightness_set, aat1290_brightness_set_work); + + flash->ops = &flash_ops; + + /* Register in the LED subsystem. */ + ret = led_classdev_flash_register(&pdev->dev, flash); + if (ret < 0) + goto error_gpio_en_set; + + return 0; + +error_gpio_en_set: + if (gpio_is_valid(enset_gpio)) + gpio_free(enset_gpio); +error_gpio_flen: + if (gpio_is_valid(flen_gpio)) + gpio_free(flen_gpio); + mutex_destroy(&led->lock); + + return ret; +} + +static int aat1290_led_remove(struct platform_device *pdev) +{ + struct aat1290_led *led = platform_get_drvdata(pdev); + + led_classdev_flash_unregister(&led->ldev); + cancel_work_sync(&led->work_brightness_set); + + if (gpio_is_valid(led->en_set_gpio)) + gpio_free(led->en_set_gpio); + if (gpio_is_valid(led->flen_gpio)) + gpio_free(led->flen_gpio); + + mutex_destroy(&led->lock); + + return 0; +} + +static struct of_device_id aat1290_led_dt_match[] = { + {.compatible = "skyworks,aat1290"}, + {}, +}; + +static struct platform_driver aat1290_led_driver = { + .probe = aat1290_led_probe, + .remove = aat1290_led_remove, + .driver = { + .name = "aat1290-led", + .owner = THIS_MODULE, + .of_match_table = aat1290_led_dt_match, + }, +}; + +module_platform_driver(aat1290_led_driver); + +MODULE_AUTHOR("Jacek Anaszewski "); +MODULE_DESCRIPTION("Skyworks Current Regulator for Flash LEDs"); +MODULE_LICENSE("GPL");