From patchwork Wed Feb 18 16:20:32 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacek Anaszewski X-Patchwork-Id: 5845161 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id AEFFA9F373 for ; Wed, 18 Feb 2015 16:25:21 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 56C8B20256 for ; Wed, 18 Feb 2015 16:25:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D948A20225 for ; Wed, 18 Feb 2015 16:25:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752840AbbBRQZN (ORCPT ); Wed, 18 Feb 2015 11:25:13 -0500 Received: from mailout2.samsung.com ([203.254.224.25]:11175 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752806AbbBRQZK (ORCPT ); Wed, 18 Feb 2015 11:25:10 -0500 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout2.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NJZ00JLA6XWDB70@mailout2.samsung.com>; Thu, 19 Feb 2015 01:25:08 +0900 (KST) X-AuditID: cbfee61a-f79c06d000004e71-36-54e4bce40d73 Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id 42.99.20081.4ECB4E45; Thu, 19 Feb 2015 01:25:08 +0900 (KST) Received: from AMDC2362.DIGITAL.local ([106.120.53.23]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0NJZ003WS6QJDJ20@mmp1.samsung.com>; Thu, 19 Feb 2015 01:25:08 +0900 (KST) From: Jacek Anaszewski To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org Cc: kyungmin.park@samsung.com, pavel@ucw.cz, cooloney@gmail.com, rpurdie@rpsys.net, sakari.ailus@iki.fi, s.nawrocki@samsung.com, Jacek Anaszewski Subject: [PATCH/RFC v11 11/20] leds: Add driver for AAT1290 current regulator Date: Wed, 18 Feb 2015 17:20:32 +0100 Message-id: <1424276441-3969-12-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1424276441-3969-1-git-send-email-j.anaszewski@samsung.com> References: <1424276441-3969-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrOLMWRmVeSWpSXmKPExsVy+t9jAd0ne56EGNztUrc4unMik8X8I+dY LXqvPme0ONv0ht1i65t1jBY9G7ayWtw9dZTNYveup6wWh9+0s1qc2b+SzYHLY+esu+weh78u ZPHYM/8Hq0ffllWMHitWf2f3+LxJLoAtissmJTUnsyy1SN8ugSvj3Z5HzAV3UiuWrtjG2sDY GdLFyMkhIWAi0fL0PQuELSZx4d56ti5GLg4hgUWMEld/7YVy2pkk7h08wQxSxSZgKPHzxWsm EFtEIFLi3dFLzCBFzAIbGCUuT2gEGyUs4Cvx5+EDsAYWAVWJK6/vsYHYvAIeEgsfvgdq5gBa pyAxZ5INiMkJFL7w3AOkQkjAXWL6zXesExh5FzAyrGIUTS1ILihOSs811CtOzC0uzUvXS87P 3cQIDr5nUjsYVzZYHGIU4GBU4uFt+P04RIg1say4MvcQowQHs5IIb+7KJyFCvCmJlVWpRfnx RaU5qcWHGKU5WJTEeZXs20KEBNITS1KzU1MLUotgskwcnFINjAsOxHOKTwrZk/5dLNTfjiWp u+dU7Ww2l+VrOaJPM6Vq5ZT0mh3mnhrXaf4pZd+2ozcDD26KOLxo8eE1lfP2f2q02LDu88WY sD2r/mTtbmXfLPm+Q0pRYMfrPcnq1ufLS1ZOivLe6qDXJ5jl9knj/UvX+RZ16dU+++9HnpBL 4vNTT1h3YJZnoBJLcUaioRZzUXEiAJf2hcQ6AgAA 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 | 407 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 415 insertions(+) create mode 100644 drivers/leds/leds-aat1290.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index ff9c21b..d70fc7b 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..b217f0a --- /dev/null +++ b/drivers/leds/leds-aat1290.c @@ -0,0 +1,407 @@ +/* + * LED Flash class driver for the AAT1290 + * 1.5A Step-Up Current Regulator for Flash LEDs + * + * Copyright (C) 2015, 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 + +#define AAT1290_MOVIE_MODE_CURRENT_ADDR 17 +#define AAT1290_MAX_MM_CURR_PERCENT_0 16 +#define AAT1290_MAX_MM_CURR_PERCENT_100 1 + +#define AAT1290_FLASH_SAFETY_TIMER_ADDR 18 + +#define AAT1290_MOVIE_MODE_CONFIG_ADDR 19 +#define AAT1290_MOVIE_MODE_OFF 1 +#define AAT1290_MOVIE_MODE_ON 3 + +#define AAT1290_MM_CURRENT_RATIO_ADDR 20 +#define AAT1290_MM_TO_FL_1_92 1 + +#define AAT1290_MM_TO_FL_RATIO 1000 / 1920 +#define AAT1290_MAX_MM_CURRENT(fl_max) (fl_max * AAT1290_MM_TO_FL_RATIO) + +#define AAT1290_LATCH_TIME_MIN_US 500 +#define AAT1290_LATCH_TIME_MAX_US 1000 +#define AAT1290_EN_SET_TICK_TIME_US 1 +#define AAT1290_FLEN_OFF_DELAY_TIME_US 10 +#define AAT1290_FLASH_TM_NUM_LEVELS 16 +#define AAT1290_MM_CURRENT_SCALE_SIZE 15 + +struct aat1290_led_settings { + struct led_flash_setting flash_timeout; +}; + +struct aat1290_led { + /* platform device data */ + struct platform_device *pdev; + /* secures access to the device */ + struct mutex lock; + + /* related LED Flash class device */ + struct led_classdev_flash fled_cdev; + + /* FLEN pin */ + int flen_gpio; + /* EN|SET pin */ + int en_set_gpio; + + /* maximum flash timeout */ + u32 max_flash_tm; + /* maximum LED current in flash mode */ + u32 max_flash_current; + /* device mode */ + bool movie_mode; + + /* brightness cache */ + unsigned int torch_brightness; + /* assures led-triggers compatibility */ + struct work_struct work_brightness_set; +}; + +static struct aat1290_led *fled_cdev_to_led( + struct led_classdev_flash *fled_cdev) +{ + return container_of(fled_cdev, struct aat1290_led, fled_cdev); +} + +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(AAT1290_FLEN_OFF_DELAY_TIME_US); + + /* 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); + } + + usleep_range(AAT1290_LATCH_TIME_MIN_US, AAT1290_LATCH_TIME_MAX_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); + } + + usleep_range(AAT1290_LATCH_TIME_MIN_US, AAT1290_LATCH_TIME_MAX_US); +} + +static void aat1290_set_flash_safety_timer(struct aat1290_led *led, + unsigned int micro_sec) +{ + struct led_classdev_flash *fled_cdev = &led->fled_cdev; + struct led_flash_setting *flash_tm = &fled_cdev->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); + led->movie_mode = false; + 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 *fled_cdev = lcdev_to_flcdev(led_cdev); + struct aat1290_led *led = fled_cdev_to_led(fled_cdev); + + 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 *fled_cdev = lcdev_to_flcdev(led_cdev); + struct aat1290_led *led = fled_cdev_to_led(fled_cdev); + + aat1290_brightness_set(led, brightness); + + return 0; +} + +static int aat1290_led_flash_strobe_set(struct led_classdev_flash *fled_cdev, + bool state) + +{ + struct aat1290_led *led = fled_cdev_to_led(fled_cdev); + struct led_classdev *led_cdev = &fled_cdev->led_cdev; + struct led_flash_setting *timeout = &fled_cdev->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 *fled_cdev, + 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, + const char **led_label) +{ + struct device_node *node = dev->of_node, *child_node; + int cnt_leds = 0, ret; + + for_each_available_child_of_node(node, child_node) { + ret = of_property_read_string(child_node, "label", + (const char **) led_label); + if (ret < 0) { + dev_err(dev, + "Error reading \"label\" DT property.\n"); + return ret; + } + + ret = of_property_read_u32(child_node, "flash-max-microamp", + &led->max_flash_current); + if (ret < 0) { + dev_err(dev, + "Error reading \"flash-max-microamp\" DT property\n"); + return ret; + } + + ret = of_property_read_u32(child_node, "flash-timeout-us", + &led->max_flash_tm); + if (ret < 0) { + dev_err(dev, + "Error reading \"flash-timeout-us\" DT property\n"); + return ret; + } + + ++cnt_leds; + } + + if (cnt_leds != 1) { + dev_err(dev, + "Expected one DT child node for the connected LED.\n"); + return -EINVAL; + } + + + return ret; +} + +static void aat1290_init_flash_settings(struct aat1290_led *led, + struct aat1290_led_settings *s) +{ + struct led_flash_setting *setting; + + /* 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 *fled_cdev; + 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 = devm_gpio_request_one(dev, flen_gpio, GPIOF_DIR_OUT, + "aat1290_flen"); + if (ret < 0) { + dev_err(dev, + "failed to request GPIO %d, error %d\n", + flen_gpio, ret); + return ret; + } + } else { + return -EINVAL; + } + led->flen_gpio = flen_gpio; + + enset_gpio = of_get_gpio(dev_node, 1); + if (gpio_is_valid(enset_gpio)) { + ret = devm_gpio_request_one(dev, 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); + return ret; + } + } else { + return -EINVAL; + } + led->en_set_gpio = enset_gpio; + + fled_cdev = &led->fled_cdev; + led_cdev = &fled_cdev->led_cdev; + + ret = aat1290_led_parse_dt(led, &pdev->dev, &led_cdev->name); + if (ret < 0) + return ret; + + /* Init flash settings */ + aat1290_init_flash_settings(led, &settings); + + fled_cdev->timeout = settings.flash_timeout; + fled_cdev->ops = &flash_ops; + + /* Init LED class */ + led_cdev->brightness_set = aat1290_led_brightness_set; + led_cdev->brightness_set_sync = aat1290_led_brightness_set_sync; + led_cdev->max_brightness = AAT1290_MM_CURRENT_SCALE_SIZE; + led_cdev->flags |= LED_DEV_CAP_FLASH; + + INIT_WORK(&led->work_brightness_set, aat1290_brightness_set_work); + + /* Register in the LED subsystem. */ + ret = led_classdev_flash_register(&pdev->dev, fled_cdev); + if (ret < 0) + return ret; + + mutex_init(&led->lock); + + return 0; +} + +static int aat1290_led_remove(struct platform_device *pdev) +{ + struct aat1290_led *led = platform_get_drvdata(pdev); + + led_classdev_flash_unregister(&led->fled_cdev); + cancel_work_sync(&led->work_brightness_set); + + 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 v2");