From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755094AbbDJHvV (ORCPT ); Fri, 10 Apr 2015 03:51:21 -0400 Received: from mailout3.samsung.com ([203.254.224.33]:8484 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753588AbbDJHvH (ORCPT ); Fri, 10 Apr 2015 03:51:07 -0400 X-AuditID: cbfee68d-f79266d0000049c9-e4-552780e99688 From: Ingi Kim To: cooloney@gmail.com, rpurdie@rpsys.net, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org Cc: sakari.ailus@iki.fi, j.anaszewski@samsung.com, varkabhadram@gmail.com, joe@perches.com, sw0312.kim@samsung.com, cw00.choi@samsung.com, jh80.chung@samsung.com, ideal.song@samsung.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, Ingi Kim Subject: [PATCH v6 RESEND 3/3] leds: Add ktd2692 flash LED driver Date: Fri, 10 Apr 2015 16:51:01 +0900 Message-id: <1428652261-24142-4-git-send-email-ingi2.kim@samsung.com> X-Mailer: git-send-email 2.0.5 In-reply-to: <1428652261-24142-1-git-send-email-ingi2.kim@samsung.com> References: <1428652261-24142-1-git-send-email-ingi2.kim@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrEIsWRmVeSWpSXmKPExsWyRsSkUPdlg3qowedWXoujOycyWVz/8pzV Yv6Rc6wW/W8Wslrs+nuf0eLcq5WMFjtufmGz6L36nNHixq82VovZ9x+zWFzeNYfNYuubdYwW S69fZLKYMH0ti0Xr3iPsFrt3PWW1OLN/JZvFjMkv2SxOdsxhdBD2WDNvDaPH5b5eJo+ds+6y e6xc/oXN4/DXhSwem1Z1snl8WXWN2WPP/B+sHn1bVjF6fN4kF8AVxWWTkpqTWZZapG+XwJXx +1E7c8H77IpVu5rYGhjfRXYxcnJICJhIPLm8iB3CFpO4cG89WxcjF4eQwFJGiRV73rLAFH2a fY0VxBYSWMQo0dxUC1E0lUli+s1rTCAJNgE1iRsrFjKBJEQEFjBKXD5/E2wUs8BOJonmyYvY QKqEBRwlXjyeDraPRUBV4t23RrCxvAKuEo39m9gg1slJrHm1Amw1p4CbROfG92wQq10l2ifP ZwYZKiEwlUPi2/wJTBCDBCS+TT4E1MABlJCV2HSAGWKOpMTBFTdYJjAKL2BkWMUomlqQXFCc lF5kqFecmFtcmpeul5yfu4kRGJWn/z3r3cF4+4D1IUYBDkYlHt6GWPVQIdbEsuLK3EOMpkAb JjJLiSbnA2M/ryTe0NjMyMLUxNTYyNzSTEmcV1HqZ7CQQHpiSWp2ampBalF8UWlOavEhRiYO TqkGRl6J/OsROVO37rGquJS8T8Pm3Mn8KRfmPAuxe3WsZ9ua5e+WcBpkpjmp/HfaMzs16erV mHsPXkjIvFY9p71RMz2Yq+y9sPh0kTKfpAW5HL1LFbZcnsy/Rv4s55oaHzthweB5ghrT5BXz ra0V/1hPvS7LPvXmnhqGJj32zXEnLruYzrqyZdfmDUosxRmJhlrMRcWJAO+4a+fFAgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrNIsWRmVeSWpSXmKPExsVy+t9jAd2XDeqhBjfcLY7unMhkcf3Lc1aL +UfOsVr0v1nIarHr731Gi3OvVjJa7Lj5hc2i9+pzRosbv9pYLWbff8xicXnXHDaLrW/WMVos vX6RyWLC9LUsFq17j7Bb7N71lNXizP6VbBYzJr9kszjZMYfRQdhjzbw1jB6X+3qZPHbOusvu sXL5FzaPw18XsnhsWtXJ5vFl1TVmjz3zf7B69G1ZxejxeZNcAFdUA6NNRmpiSmqRQmpecn5K Zl66rZJ3cLxzvKmZgaGuoaWFuZJCXmJuqq2Si0+ArltmDtBvSgpliTmlQKGAxOJiJX07TBNC Q9x0LWAaI3R9Q4LgeowM0EDCGsaM34/amQveZ1es2tXE1sD4LrKLkZNDQsBE4tPsa6wQtpjE hXvr2UBsIYFFjBLNTbVdjFxA9lQmiek3rzGBJNgE1CRurFjIBJIQEVjAKHH5/E02EIdZYCeT RPPkRWDtwgKOEi8eT2cHsVkEVCXefWsEW8Er4CrR2L+JDWKdnMSaVytYQGxOATeJzo3voVa7 SrRPns88gZF3ASPDKkbR1ILkguKk9FwjveLE3OLSvHS95PzcTYzgiH8mvYNxVYPFIUYBDkYl Ht6GWPVQIdbEsuLK3EOMEhzMSiK8lSAh3pTEyqrUovz4otKc1OJDjKZAV01klhJNzgcmo7yS eENjEzMjSyNzQwsjY3Mlcd45unKhQgLpiSWp2ampBalFMH1MHJxSDYwC3pMN3z7ZLdC7aquf hmfMTE/n0EvNhmJqzvOWcxxvLKpUUs5nulfv9trc8pCUtUjiOjb5l6pBpsaVeQnPd9/dtaxL js/9qt+exZ8u1c6ZKGx6wtF09cz/xrx/ClvWbVhWzX65+FCTE9+xy7EZM3fscOflTtts8X6L 6Gbn+YaF7t4SoQtdXiixFGckGmoxFxUnAgDayMz5DgMAAA== DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds a driver to support the ktd2692 flash LEDs. ktd2692 can control flash current by ExpressWire interface. Signed-off-by: Ingi Kim --- drivers/leds/Kconfig | 9 + drivers/leds/Makefile | 1 + drivers/leds/leds-ktd2692.c | 409 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 419 insertions(+) create mode 100644 drivers/leds/leds-ktd2692.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 51059bb..86197ef 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -505,6 +505,15 @@ config LEDS_MENF21BMC This driver can also be built as a module. If so the module will be called leds-menf21bmc. +config LEDS_KTD2692 + tristate "KTD2692 LED flash support" + depends on LEDS_CLASS_FLASH && GPIOLIB + help + This option enables support for KTD2692 LED flash connected + through ExpressWire interface. + + Say Y to enable this driver. + comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)" config LEDS_BLINKM diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index a739ae2..ed5ed79 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -59,6 +59,7 @@ obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o obj-$(CONFIG_LEDS_SYSCON) += leds-syscon.o obj-$(CONFIG_LEDS_VERSATILE) += leds-versatile.o obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o +obj-$(CONFIG_LEDS_KTD2692) += leds-ktd2692.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o diff --git a/drivers/leds/leds-ktd2692.c b/drivers/leds/leds-ktd2692.c new file mode 100644 index 0000000..dd76b8f --- /dev/null +++ b/drivers/leds/leds-ktd2692.c @@ -0,0 +1,409 @@ +/* + * LED driver : leds-ktd2692.c + * + * Copyright (C) 2015 Samsung Electronics + * Ingi Kim + * + * 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 + +/* Value related the flash mode */ +#define KTD2692_FLASH_MODE_TIMEOUT_LEVELS 8 +#define KTD2692_FLASH_MODE_TIMEOUT_DISABLE 0 +#define KTD2692_FLASH_MODE_TIMEOUT_DEFAULT_US 1049000 +#define KTD2692_FLASH_MODE_TIMEOUT_MAX_US 1835000 +#define KTD2692_FLASH_MODE_CURR_PERCENT(x) (((x) * 16) / 100) + +/* Macro for getting offset of flash timeout */ +#define GET_TIMEOUT_OFFSET(timeout, step) ((timeout) / (step)) + +/* Adjust a multiple of brightness */ +#define KTD2692_BRIGHTNESS_RANGE_255_TO_16(x) (((x) >> 4) & 0x0F) +#define KTD2692_BRIGHTNESS_RANGE_255_TO_8(x) (((x) >> 5) & 0x0F) +#define KTD2692_BRIGHTNESS_RANGE_255_TO_4(x) (((x) >> 6) & 0x0F) + +/* Base register address */ +#define KTD2692_REG_LVP_BASE 0x00 +#define KTD2692_REG_FLASH_TIMEOUT_BASE 0x20 +#define KTD2692_REG_MIN_CURRENT_SET_BASE 0x40 +#define KTD2692_REG_MOVIE_CURRENT_BASE 0x60 +#define KTD2692_REG_FLASH_CURRENT_BASE 0x80 +#define KTD2692_REG_MODE_BASE 0xA0 + +/* Set bit coding time for expresswire interface */ +#define KTD2692_TIME_RESET_US 700 +#define KTD2692_TIME_DATA_START_TIME_US 10 +#define KTD2692_TIME_HIGH_END_OF_DATA_US 350 +#define KTD2692_TIME_LOW_END_OF_DATA_US 10 +#define KTD2692_TIME_SHORT_BITSET_US 4 +#define KTD2692_TIME_LONG_BITSET_US 12 + +/* KTD2692 default length of name */ +#define KTD2692_NAME_LENGTH 20 + +enum ktd2692_bitset { + KTD2692_LOW = 0, + KTD2692_HIGH, +}; + +/* Movie / Flash Mode Control */ +enum ktd2692_led_mode { + KTD2692_MODE_DISABLE = 0, /* default */ + KTD2692_MODE_MOVIE, + KTD2692_MODE_FLASH, +}; + +struct ktd2692_context { + /* Related LED Flash class device */ + struct led_classdev_flash fled_cdev; + + /* secures access to the device */ + struct mutex lock; + struct regulator *regulator; + struct work_struct work_brightness_set; + + int aux_gpio; + int ctrl_gpio; + + enum ktd2692_led_mode mode; + enum led_brightness torch_brightness; +}; + +static struct ktd2692_context *fled_cdev_to_led( + struct led_classdev_flash *fled_cdev) +{ + return container_of(fled_cdev, struct ktd2692_context, fled_cdev); +} + +static void ktd2692_expresswire_start(struct ktd2692_context *led) +{ + gpio_set_value(led->ctrl_gpio, KTD2692_HIGH); + udelay(KTD2692_TIME_DATA_START_TIME_US); +} + +static void ktd2692_expresswire_reset(struct ktd2692_context *led) +{ + gpio_set_value(led->ctrl_gpio, KTD2692_LOW); + udelay(KTD2692_TIME_RESET_US); +} + +static void ktd2692_expresswire_end(struct ktd2692_context *led) +{ + gpio_set_value(led->ctrl_gpio, KTD2692_LOW); + udelay(KTD2692_TIME_LOW_END_OF_DATA_US); + gpio_set_value(led->ctrl_gpio, KTD2692_HIGH); + udelay(KTD2692_TIME_HIGH_END_OF_DATA_US); +} + +static void ktd2692_expresswire_set_bit(struct ktd2692_context *led, bool bit) +{ + /* + * The Low Bit(0) and High Bit(1) is based on a time detection + * algorithm between time low and time high + * Time_(L_LB) : Low time of the Low Bit(0) + * Time_(H_LB) : High time of the LOW Bit(0) + * Time_(L_HB) : Low time of the High Bit(1) + * Time_(H_HB) : High time of the High Bit(1) + * + * It can be simplified to: + * Low Bit(0) : 2 * Time_(H_LB) < Time_(L_LB) + * High Bit(1) : 2 * Time_(L_HB) < Time_(H_HB) + * HIGH ___ ____ _.. _________ ___ + * |_________| |_.. |____| |__| + * LOW + * [ Low Bit (0) ] [ High Bit(1) ] + */ + if (bit) { + gpio_set_value(led->ctrl_gpio, KTD2692_LOW); + udelay(KTD2692_TIME_SHORT_BITSET_US); + gpio_set_value(led->ctrl_gpio, KTD2692_HIGH); + udelay(KTD2692_TIME_LONG_BITSET_US); + } else { + gpio_set_value(led->ctrl_gpio, KTD2692_LOW); + udelay(KTD2692_TIME_LONG_BITSET_US); + gpio_set_value(led->ctrl_gpio, KTD2692_HIGH); + udelay(KTD2692_TIME_SHORT_BITSET_US); + } +} + +static void ktd2692_expresswire_write(struct ktd2692_context *led, u8 value) +{ + int i; + + ktd2692_expresswire_start(led); + for (i = 7; i >= 0; i--) + ktd2692_expresswire_set_bit(led, value & BIT(i)); + ktd2692_expresswire_end(led); +} + +static void ktd2692_brightness_set(struct ktd2692_context *led, + enum led_brightness brightness) +{ + mutex_lock(&led->lock); + + if (brightness == LED_OFF) { + led->mode = KTD2692_MODE_DISABLE; + gpio_set_value(led->aux_gpio, KTD2692_LOW); + } else { + ktd2692_expresswire_write(led, KTD2692_REG_MOVIE_CURRENT_BASE | + KTD2692_BRIGHTNESS_RANGE_255_TO_8(brightness)); + led->mode = KTD2692_MODE_MOVIE; + } + + ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE); + mutex_unlock(&led->lock); +} + +static void ktd2692_brightness_set_work(struct work_struct *work) +{ + struct ktd2692_context *led = + container_of(work, struct ktd2692_context, work_brightness_set); + + ktd2692_brightness_set(led, led->torch_brightness); +} + +static void ktd2692_led_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); + struct ktd2692_context *led = fled_cdev_to_led(fled_cdev); + + led->torch_brightness = brightness; + schedule_work(&led->work_brightness_set); +} + +static int ktd2692_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 ktd2692_context *led = fled_cdev_to_led(fled_cdev); + + ktd2692_brightness_set(led, brightness); + + return 0; +} + +static int ktd2692_led_flash_strobe_set(struct led_classdev_flash *fled_cdev, + bool state) +{ + struct ktd2692_context *led = fled_cdev_to_led(fled_cdev); + struct led_flash_setting *timeout = &fled_cdev->timeout; + u32 flash_tm_reg; + + mutex_lock(&led->lock); + + if (state == 0) { + led->mode = KTD2692_MODE_DISABLE; + gpio_set_value(led->aux_gpio, KTD2692_LOW); + } else { + flash_tm_reg = GET_TIMEOUT_OFFSET(timeout->val, timeout->step); + ktd2692_expresswire_write(led, flash_tm_reg + | KTD2692_REG_FLASH_TIMEOUT_BASE); + + led->mode = KTD2692_MODE_FLASH; + gpio_set_value(led->aux_gpio, KTD2692_HIGH); + } + + ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE); + + fled_cdev->led_cdev.brightness = LED_OFF; + led->mode = KTD2692_MODE_DISABLE; + + mutex_unlock(&led->lock); + + return 0; +} + +static int ktd2692_led_flash_timeout_set(struct led_classdev_flash *fled_cdev, + u32 timeout) +{ + return 0; +} + +static void ktd2692_init_flash_timeout(u32 flash_timeout_us, + struct led_flash_setting *setting) +{ + setting->min = KTD2692_FLASH_MODE_TIMEOUT_DISABLE; + setting->max = KTD2692_FLASH_MODE_TIMEOUT_MAX_US; + setting->step = KTD2692_FLASH_MODE_TIMEOUT_MAX_US + / (KTD2692_FLASH_MODE_TIMEOUT_LEVELS - 1); + setting->val = flash_timeout_us; +} + +static void ktd2692_setup(struct ktd2692_context *led) +{ + led->mode = KTD2692_MODE_DISABLE; + ktd2692_expresswire_reset(led); + gpio_set_value(led->aux_gpio, KTD2692_LOW); + + ktd2692_expresswire_write(led, KTD2692_FLASH_MODE_CURR_PERCENT(45) + | KTD2692_REG_FLASH_CURRENT_BASE); +} + +static int ktd2692_parse_dt(struct ktd2692_context *led, struct device *dev, + u32 *flash_timeout_us) +{ + struct device_node *np = dev->of_node; + struct device_node *child_node; + int ret; + + if (!dev->of_node) + return -ENXIO; + + led->ctrl_gpio = of_get_named_gpio(np, "ctrl-gpio", 0); + if (!gpio_is_valid(led->ctrl_gpio)) { + dev_err(dev, "no ctrl-gpio property found\n"); + return -EINVAL; + } + + led->aux_gpio = of_get_named_gpio(np, "aux-gpio", 0); + if (!gpio_is_valid(led->aux_gpio)) { + dev_err(dev, "no aux-gpio property found\n"); + return -EINVAL; + } + + ret = devm_gpio_request_one(dev, led->ctrl_gpio, + GPIOF_OPEN_SOURCE, "ctrl-gpio"); + if (ret) { + dev_err(dev, "failed to request ctrl-gpio %d error %d\n", + led->ctrl_gpio, ret); + return ret; + } + + ret = devm_gpio_request_one(dev, led->aux_gpio, + GPIOF_OPEN_SOURCE, "aux-gpio"); + if (ret) { + dev_err(dev, "failed to request aux-gpio %d error %d\n", + led->aux_gpio, ret); + return ret; + } + + child_node = of_get_next_available_child(np, NULL); + if (!child_node) { + dev_err(dev, "No DT child node found for connected LED.\n"); + return -EINVAL; + } + + led->fled_cdev.led_cdev.name = + of_get_property(child_node, "label", NULL) ? : child_node->name; + + ret = of_property_read_u32(child_node, + "flash-timeout-us", flash_timeout_us); + /* default setting */ + if (ret) + *flash_timeout_us = KTD2692_FLASH_MODE_TIMEOUT_DEFAULT_US; + + return 0; +} + +static const struct led_flash_ops flash_ops = { + .strobe_set = ktd2692_led_flash_strobe_set, + .timeout_set = ktd2692_led_flash_timeout_set, +}; + +static int ktd2692_probe(struct platform_device *pdev) +{ + struct ktd2692_context *led; + struct led_classdev *led_cdev; + struct led_classdev_flash *fled_cdev; + struct led_flash_setting flash_timeout; + u32 flash_timeout_us; + int ret; + + led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + fled_cdev = &led->fled_cdev; + led_cdev = &fled_cdev->led_cdev; + + ret = ktd2692_parse_dt(led, &pdev->dev, &flash_timeout_us); + if (ret) + return ret; + + led->regulator = devm_regulator_get(&pdev->dev, "vin"); + if (IS_ERR(led->regulator)) { + dev_err(&pdev->dev, "regulator get failed\n"); + return PTR_ERR(led->regulator); + } + + ret = regulator_enable(led->regulator); + if (ret) { + dev_err(&pdev->dev, "Failed to enable supply: %d\n", ret); + return ret; + } + + ktd2692_init_flash_timeout(flash_timeout_us, &flash_timeout); + + fled_cdev->timeout = flash_timeout; + fled_cdev->ops = &flash_ops; + + led_cdev->brightness_set = ktd2692_led_brightness_set; + led_cdev->brightness_set_sync = ktd2692_led_brightness_set_sync; + led_cdev->flags |= LED_CORE_SUSPENDRESUME | LED_DEV_CAP_FLASH; + + mutex_init(&led->lock); + INIT_WORK(&led->work_brightness_set, ktd2692_brightness_set_work); + + platform_set_drvdata(pdev, led); + + ret = led_classdev_flash_register(&pdev->dev, fled_cdev); + if (ret) { + dev_err(&pdev->dev, "can't register LED %s\n", led_cdev->name); + mutex_destroy(&led->lock); + return ret; + } + + ktd2692_setup(led); + + return 0; +} + +static int ktd2692_remove(struct platform_device *pdev) +{ + struct ktd2692_context *led = platform_get_drvdata(pdev); + int ret; + + led_classdev_flash_unregister(&led->fled_cdev); + cancel_work_sync(&led->work_brightness_set); + + ret = regulator_disable(led->regulator); + if (ret) + dev_err(&pdev->dev, "Failed to disable supply: %d\n", ret); + + mutex_destroy(&led->lock); + + return 0; +} + +static const struct of_device_id ktd2692_match[] = { + { .compatible = "kinetic,ktd2692", }, + { /* sentinel */ }, +}; + +static struct platform_driver ktd2692_driver = { + .driver = { + .name = "ktd2692", + .of_match_table = ktd2692_match, + }, + .probe = ktd2692_probe, + .remove = ktd2692_remove, +}; + +module_platform_driver(ktd2692_driver); + +MODULE_AUTHOR("Ingi Kim "); +MODULE_DESCRIPTION("Kinetic KTD2692 LED driver"); +MODULE_LICENSE("GPL v2"); -- 2.0.5