[PATCH v2 3/3] leds: Add ktd2692 flash LED driver
From: Ingi Kim
Date: Tue Mar 17 2015 - 04:49:11 EST
This patch adds a driver to support the ktd2692 flash LEDs.
ktd2692 can control flash current by ExpressWire interface.
Signed-off-by: Ingi Kim <ingi2.kim@xxxxxxxxxxx>
---
drivers/leds/Kconfig | 9 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-ktd2692.c | 522 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 532 insertions(+)
create mode 100644 drivers/leds/leds-ktd2692.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 25b320d..9311cfc4 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -498,6 +498,15 @@ 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 "Flash LED support for the KTD2692 Driver"
+ depends on LEDS_CLASS_FLASH && GPIOLIB
+ help
+ This option enables support for the KTD2692 connected through
+ ExpressWire Interface. Say Y to enabled these.
+ It depends on LEDS_CLASS_FLASH for using flash led (strobe) and
+ GPIOLIB for using gpio pin to control Expresswire interface
+
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 cbba921..289513b 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -58,6 +58,7 @@ 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..8aa339c
--- /dev/null
+++ b/drivers/leds/leds-ktd2692.c
@@ -0,0 +1,522 @@
+/*
+ * LED driver : leds-ktd2692.c
+ *
+ * Copyright (C) 2015 Samsung Electronics
+ * Ingi Kim <ingi2.kim@xxxxxxxxxxx>
+ *
+ * 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 <linux/delay.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/led-class-flash.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/workqueue.h>
+
+#define GET_BIT(bit, val) (((val) >> (bit)) & 0x01)
+
+/* Value related the flash timeout */
+#define KTD2692_FLASH_TM_LEVELS 8
+#define KTD2692_DEFAULT_FLASH_TM_US 1049000
+#define KTD2692_MAX_FLASH_TM_US 1835000
+
+/* 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
+
+/* KTD2692 default name */
+#define KTD2692_DEFAULT_NAME "ktd2692"
+
+enum ktd2692_bitset {
+ KTD2692_LOW = 0,
+ KTD2692_HIGH,
+};
+
+/* Low Voltage Protection Setting */
+enum ktd2692_lvp_setting {
+ KTD2692_LVP_DISABLE = 0,
+ KTD2692_LVP_3_2V,
+ KTD2692_LVP_3_3V,
+ KTD2692_LVP_3_4V, /* default */
+ KTD2692_LVP_3_5V,
+ KTD2692_LVP_3_6V,
+ KTD2692_LVP_3_7V,
+ KTD2692_LVP_3_8V,
+};
+
+/* Flash Timeout Setting (msec) */
+enum ktd2692_timeout_setting {
+ KTD2692_TIMEOUT_DISABLE = 0,
+ KTD2692_TIMEOUT_262ms,
+ KTD2692_TIMEOUT_524ms,
+ KTD2692_TIMEOUT_786ms,
+ KTD2692_TIMEOUT_1049ms, /* default */
+ KTD2692_TIMEOUT_1311ms,
+ KTD2692_TIMEOUT_1573ms,
+ KTD2692_TIMEOUT_1835ms,
+};
+
+/* Minimum Current Setting for Timer Operating */
+enum ktd2692_min_current_setting {
+ KTD2692_MIN_CURRENT_90mA = 0,
+ KTD2692_MIN_CURRENT_120mA,
+ KTD2692_MIN_CURRENT_150mA,
+ KTD2692_MIN_CURRENT_180mA,
+ KTD2692_MIN_CURRENT_210mA,
+ KTD2692_MIN_CURRENT_240mA, /* default */
+ KTD2692_MIN_CURRENT_270mA,
+ KTD2692_MIN_CURRENT_300mA,
+};
+
+/* Movie current setting */
+enum ktd2692_movie_current_setting {
+ KTD2692_MOVIE_CURRENT_1 = 0,
+ KTD2692_MOVIE_CURRENT_2,
+ KTD2692_MOVIE_CURRENT_3,
+ KTD2692_MOVIE_CURRENT_4,
+ KTD2692_MOVIE_CURRENT_5, /* default */
+ KTD2692_MOVIE_CURRENT_6,
+ KTD2692_MOVIE_CURRENT_7,
+ KTD2692_MOVIE_CURRENT_8,
+ KTD2692_MOVIE_CURRENT_9,
+ KTD2692_MOVIE_CURRENT_10,
+ KTD2692_MOVIE_CURRENT_11,
+ KTD2692_MOVIE_CURRENT_12,
+ KTD2692_MOVIE_CURRENT_13,
+ KTD2692_MOVIE_CURRENT_14,
+ KTD2692_MOVIE_CURRENT_15,
+ KTD2692_MOVIE_CURRENT_16,
+};
+
+/* Flash current setting */
+enum ktd2692_flash_current_setting {
+ KTD2692_FLASH_CURRENT_1 = 0,
+ KTD2692_FLASH_CURRENT_2,
+ KTD2692_FLASH_CURRENT_3,
+ KTD2692_FLASH_CURRENT_4,
+ KTD2692_FLASH_CURRENT_5,
+ KTD2692_FLASH_CURRENT_6,
+ KTD2692_FLASH_CURRENT_7,
+ KTD2692_FLASH_CURRENT_8,
+ KTD2692_FLASH_CURRENT_9,
+ KTD2692_FLASH_CURRENT_10,
+ KTD2692_FLASH_CURRENT_11,
+ KTD2692_FLASH_CURRENT_12,
+ KTD2692_FLASH_CURRENT_13,
+ KTD2692_FLASH_CURRENT_14,
+ KTD2692_FLASH_CURRENT_15,
+ KTD2692_FLASH_CURRENT_16, /* default */
+};
+
+/* Movie / Flash Mode Control */
+enum ktd2692_mode_setting {
+ KTD2692_MODE_DISABLE = 0, /* default */
+ KTD2692_MODE_MOVIE,
+ KTD2692_MODE_FLASH,
+};
+
+struct ktd2692_led_settings {
+ enum ktd2692_lvp_setting lvp;
+ enum ktd2692_min_current_setting min_current;
+ enum ktd2692_movie_current_setting movie_current;
+ enum ktd2692_flash_current_setting flash_current;
+ enum ktd2692_mode_setting mode;
+};
+
+struct ktd2692_flash_timeout_setting {
+ struct led_flash_setting flash_timeout;
+};
+
+struct ktd2692_context {
+ struct ktd2692_led_settings setting;
+ /* Related LED Flash class device */
+ struct led_classdev_flash fled_cdev;
+ struct mutex lock;
+ struct regulator *regulator;
+ struct work_struct work_brightness_set;
+
+ int ctrl_gpio;
+ u32 flash_timeout_us;
+ 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 int ktd2692_led_regulator_enable(struct ktd2692_context *led)
+{
+ struct led_classdev_flash *fled_cdev = &led->fled_cdev;
+ struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+ int ret;
+
+ if (regulator_is_enabled(led->regulator) > 0)
+ return 0;
+
+ ret = regulator_enable(led->regulator);
+ if (ret)
+ dev_err(led_cdev->dev, "Failed to enable vin:%d\n", ret);
+
+ return ret;
+}
+
+static void ktd2692_led_regulator_disable(struct ktd2692_context *led)
+{
+ struct led_classdev_flash *fled_cdev = &led->fled_cdev;
+ struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+ int ret;
+
+ if (!regulator_is_enabled(led->regulator))
+ return;
+
+ ret = regulator_disable(led->regulator);
+ if (ret)
+ dev_err(led_cdev->dev, "Failed to disable vin:%d\n", ret);
+}
+
+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)
+{
+ 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, GET_BIT(i, value));
+ ktd2692_expresswire_end(led);
+}
+
+static void ktd2692_brightness_set(struct ktd2692_context *led,
+ enum led_brightness brightness)
+{
+ mutex_lock(&led->lock);
+
+ ktd2692_expresswire_reset(led);
+
+ if (brightness == LED_OFF) {
+ led->setting.mode = KTD2692_MODE_DISABLE;
+ led->fled_cdev.led_cdev.brightness = LED_OFF;
+ goto out;
+ }
+
+ if (brightness < 0 ||
+ brightness > led->fled_cdev.led_cdev.max_brightness) {
+ dev_err(led->fled_cdev.led_cdev.dev,
+ "Invalid brightness %d\n", brightness);
+ goto out;
+ }
+
+ led->setting.movie_current =
+ KTD2692_BRIGHTNESS_RANGE_255_TO_8(brightness);
+ ktd2692_expresswire_write(led, led->setting.movie_current
+ | KTD2692_REG_MOVIE_CURRENT_BASE);
+ ktd2692_expresswire_write(led, KTD2692_LVP_DISABLE
+ | KTD2692_REG_LVP_BASE);
+ ktd2692_expresswire_write(led, KTD2692_MIN_CURRENT_300mA
+ | KTD2692_REG_MIN_CURRENT_SET_BASE);
+ led->setting.mode = KTD2692_MODE_MOVIE;
+ ktd2692_expresswire_write(led,
+ led->setting.mode | KTD2692_REG_MODE_BASE);
+
+ led->fled_cdev.led_cdev.brightness = brightness;
+
+out:
+ 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 enum led_brightness ktd2692_brightness_get(struct led_classdev *led_cdev)
+{
+ struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+ struct ktd2692_context *led = fled_cdev_to_led(fled_cdev);
+
+ return led->fled_cdev.led_cdev.brightness;
+}
+
+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);
+
+ ktd2692_expresswire_reset(led);
+
+ if (state == 0)
+ goto out;
+
+ led->setting.mode = KTD2692_MODE_FLASH;
+ flash_tm_reg = GET_TIMEOUT_OFFSET(timeout->val, timeout->step);
+
+ ktd2692_expresswire_write(led, led->setting.lvp
+ | KTD2692_REG_LVP_BASE);
+ ktd2692_expresswire_write(led, led->setting.min_current
+ | KTD2692_REG_MIN_CURRENT_SET_BASE);
+ ktd2692_expresswire_write(led, flash_tm_reg
+ | KTD2692_REG_FLASH_TIMEOUT_BASE);
+ ktd2692_expresswire_write(led, led->setting.flash_current
+ | KTD2692_REG_FLASH_CURRENT_BASE);
+ ktd2692_expresswire_write(led, led->setting.mode
+ | KTD2692_REG_MODE_BASE);
+
+ fled_cdev->led_cdev.brightness = LED_OFF;
+ led->setting.mode = KTD2692_MODE_DISABLE;
+
+out:
+ mutex_unlock(&led->lock);
+ return 0;
+}
+
+static int ktd2692_led_flash_timeout_set(struct led_classdev_flash *fled_cdev,
+ u32 timeout)
+{
+ struct ktd2692_context *led = fled_cdev_to_led(fled_cdev);
+
+ led->fled_cdev.timeout.val = timeout;
+
+ return 0;
+}
+
+static int ktd2692_parse_dt(struct ktd2692_context *led, struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ int ret;
+
+ led->ctrl_gpio = of_get_named_gpio(np, "ctrl-gpio", 0);
+ if (!gpio_is_valid(led->ctrl_gpio)) {
+ dev_err(dev, "no strobe_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 = of_property_read_u32(np, "flash-timeout-us",
+ &led->flash_timeout_us);
+ /* default setting */
+ if (ret)
+ led->flash_timeout_us = KTD2692_DEFAULT_FLASH_TM_US;
+
+ return 0;
+}
+
+static void ktd2692_init_flash_timeout_set(u32 flash_timeout_us,
+ struct ktd2692_flash_timeout_setting *s)
+{
+ struct led_flash_setting *setting;
+
+ setting = &s->flash_timeout;
+ setting->min = KTD2692_TIMEOUT_DISABLE;
+ setting->max = KTD2692_MAX_FLASH_TM_US;
+ setting->step = KTD2692_MAX_FLASH_TM_US / (KTD2692_FLASH_TM_LEVELS - 1);
+ setting->val = flash_timeout_us;
+}
+
+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 ktd2692_flash_timeout_setting timeout_setting;
+ int ret;
+
+ led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ if (!pdev->dev.of_node)
+ return -ENXIO;
+
+ fled_cdev = &led->fled_cdev;
+ led_cdev = &fled_cdev->led_cdev;
+ platform_set_drvdata(pdev, led);
+
+ ret = ktd2692_parse_dt(led, &pdev->dev);
+ 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");
+ ret = PTR_ERR(led->regulator);
+ led->regulator = NULL;
+ return ret;
+ }
+
+ ret = ktd2692_led_regulator_enable(led);
+ if (ret)
+ goto err_regulator;
+
+ ktd2692_init_flash_timeout_set(led->flash_timeout_us, &timeout_setting);
+ fled_cdev->timeout = timeout_setting.flash_timeout;
+ fled_cdev->ops = &flash_ops;
+
+ led->setting.lvp = KTD2692_LVP_DISABLE;
+ led->setting.min_current = KTD2692_MIN_CURRENT_240mA;
+ led->setting.flash_current = KTD2692_FLASH_CURRENT_7;
+ led->setting.mode = KTD2692_MODE_DISABLE;
+
+ led_cdev->name = KTD2692_DEFAULT_NAME;
+ led_cdev->brightness = LED_OFF;
+ led_cdev->max_brightness = LED_FULL;
+ led_cdev->brightness_set = ktd2692_led_brightness_set;
+ led_cdev->brightness_set_sync = ktd2692_led_brightness_set_sync;
+ led_cdev->brightness_get = ktd2692_brightness_get;
+ led_cdev->flags |= LED_DEV_CAP_FLASH;
+ led_cdev->flags |= LED_CORE_SUSPENDRESUME;
+
+ INIT_WORK(&led->work_brightness_set, ktd2692_brightness_set_work);
+
+ ret = led_classdev_flash_register(&pdev->dev, fled_cdev);
+ if (ret) {
+ dev_err(&pdev->dev, "can't register LED %s\n", led_cdev->name);
+ goto err_register;
+ }
+
+ mutex_init(&led->lock);
+
+ return 0;
+err_register:
+ cancel_work_sync(&led->work_brightness_set);
+err_regulator:
+ ktd2692_led_regulator_disable(led);
+ platform_set_drvdata(pdev, NULL);
+ return ret;
+}
+
+static int ktd2692_remove(struct platform_device *pdev)
+{
+ struct ktd2692_context *led = platform_get_drvdata(pdev);
+
+ cancel_work_sync(&led->work_brightness_set);
+ led_classdev_flash_unregister(&led->fled_cdev);
+ ktd2692_led_regulator_disable(led);
+
+ 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 = "leds-ktd2692",
+ .of_match_table = ktd2692_match,
+ },
+ .probe = ktd2692_probe,
+ .remove = ktd2692_remove,
+};
+
+module_platform_driver(ktd2692_driver);
+
+MODULE_AUTHOR("Ingi Kim <ingi2.kim@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Kinetic KTD2692 LED driver");
+MODULE_LICENSE("GPL v2");
--
2.0.5
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