This driver can also be built as a module. If so the module
will be called leds-menf21bmc.
-config LEDS_KTD2692
- tristate "LED support for KTD2692 flash LED controller"
- depends on LEDS_CLASS_FLASH && OF
- depends on GPIOLIB || COMPILE_TEST
- help
- This option enables support for KTD2692 LED flash connected
- through ExpressWire interface.
-
- Say Y to enable this driver.
-
config LEDS_IS31FL319X
tristate "LED Support for ISSI IS31FL319x I2C LED controller family"
depends on LEDS_CLASS && I2C && OF
obj-$(CONFIG_LEDS_IPAQ_MICRO) += leds-ipaq-micro.o
obj-$(CONFIG_LEDS_IS31FL319X) += leds-is31fl319x.o
obj-$(CONFIG_LEDS_IS31FL32XX) += leds-is31fl32xx.o
-obj-$(CONFIG_LEDS_KTD2692) += leds-ktd2692.o
obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o
obj-$(CONFIG_LEDS_LM3532) += leds-lm3532.o
obj-$(CONFIG_LEDS_LM3533) += leds-lm3533.o
controller. V4L2 flash API is provided as well if
CONFIG_V4L2_FLASH_API is enabled.
+config LEDS_KTD2692
+ tristate "LED support for Kinetic KTD2692 flash LED controller"
+ depends on OF
+ depends on GPIOLIB || COMPILE_TEST
+ help
+ This option enables support for Kinetic KTD2692 LED flash connected
+ through ExpressWire interface.
+
+ Say Y to enable this driver.
+
config LEDS_LM3601X
tristate "LED support for LM3601x Chips"
depends on LEDS_CLASS && I2C
obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o
obj-$(CONFIG_LEDS_AS3645A) += leds-as3645a.o
+obj-$(CONFIG_LEDS_KTD2692) += leds-ktd2692.o
obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o
obj-$(CONFIG_LEDS_MAX77693) += leds-max77693.o
obj-$(CONFIG_LEDS_RT4505) += leds-rt4505.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * LED driver : leds-ktd2692.c
+ *
+ * Copyright (C) 2015 Samsung Electronics
+ * Ingi Kim <ingi2.kim@samsung.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/led-class-flash.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+
+/* Value related the movie mode */
+#define KTD2692_MOVIE_MODE_CURRENT_LEVELS 16
+#define KTD2692_MM_TO_FL_RATIO(x) ((x) / 3)
+#define KTD2692_MM_MIN_CURR_THRESHOLD_SCALE 8
+
+/* Value related the flash mode */
+#define KTD2692_FLASH_MODE_TIMEOUT_LEVELS 8
+#define KTD2692_FLASH_MODE_TIMEOUT_DISABLE 0
+#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))
+
+/* Base register address */
+#define KTD2692_REG_LVP_BASE 0x00
+#define KTD2692_REG_FLASH_TIMEOUT_BASE 0x20
+#define KTD2692_REG_MM_MIN_CURR_THRESHOLD_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_led_config_data {
+ /* maximum LED current in movie mode */
+ u32 movie_max_microamp;
+ /* maximum LED current in flash mode */
+ u32 flash_max_microamp;
+ /* maximum flash timeout */
+ u32 flash_max_timeout;
+ /* max LED brightness level */
+ enum led_brightness max_brightness;
+};
+
+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 gpio_desc *aux_gpio;
+ struct gpio_desc *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)
+{
+ gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
+ udelay(KTD2692_TIME_DATA_START_TIME_US);
+}
+
+static void ktd2692_expresswire_reset(struct ktd2692_context *led)
+{
+ gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
+ udelay(KTD2692_TIME_RESET_US);
+}
+
+static void ktd2692_expresswire_end(struct ktd2692_context *led)
+{
+ gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
+ udelay(KTD2692_TIME_LOW_END_OF_DATA_US);
+ gpiod_direction_output(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 <L_LB> <H_LB> <L_HB> <H_HB>
+ * [ Low Bit (0) ] [ High Bit(1) ]
+ */
+ if (bit) {
+ gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
+ udelay(KTD2692_TIME_SHORT_BITSET_US);
+ gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
+ udelay(KTD2692_TIME_LONG_BITSET_US);
+ } else {
+ gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
+ udelay(KTD2692_TIME_LONG_BITSET_US);
+ gpiod_direction_output(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 int 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);
+
+ mutex_lock(&led->lock);
+
+ if (brightness == LED_OFF) {
+ led->mode = KTD2692_MODE_DISABLE;
+ gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
+ } else {
+ ktd2692_expresswire_write(led, brightness |
+ KTD2692_REG_MOVIE_CURRENT_BASE);
+ led->mode = KTD2692_MODE_MOVIE;
+ }
+
+ ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE);
+ mutex_unlock(&led->lock);
+
+ 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) {
+ 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;
+ gpiod_direction_output(led->aux_gpio, KTD2692_HIGH);
+ } else {
+ led->mode = KTD2692_MODE_DISABLE;
+ gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
+ }
+
+ 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_movie_current_max(struct ktd2692_led_config_data *cfg)
+{
+ u32 offset, step;
+ u32 movie_current_microamp;
+
+ offset = KTD2692_MOVIE_MODE_CURRENT_LEVELS;
+ step = KTD2692_MM_TO_FL_RATIO(cfg->flash_max_microamp)
+ / KTD2692_MOVIE_MODE_CURRENT_LEVELS;
+
+ do {
+ movie_current_microamp = step * offset;
+ offset--;
+ } while ((movie_current_microamp > cfg->movie_max_microamp) &&
+ (offset > 0));
+
+ cfg->max_brightness = offset;
+}
+
+static void ktd2692_init_flash_timeout(struct led_classdev_flash *fled_cdev,
+ struct ktd2692_led_config_data *cfg)
+{
+ struct led_flash_setting *setting;
+
+ setting = &fled_cdev->timeout;
+ setting->min = KTD2692_FLASH_MODE_TIMEOUT_DISABLE;
+ setting->max = cfg->flash_max_timeout;
+ setting->step = cfg->flash_max_timeout
+ / (KTD2692_FLASH_MODE_TIMEOUT_LEVELS - 1);
+ setting->val = cfg->flash_max_timeout;
+}
+
+static void ktd2692_setup(struct ktd2692_context *led)
+{
+ led->mode = KTD2692_MODE_DISABLE;
+ ktd2692_expresswire_reset(led);
+ gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
+
+ ktd2692_expresswire_write(led, (KTD2692_MM_MIN_CURR_THRESHOLD_SCALE - 1)
+ | KTD2692_REG_MM_MIN_CURR_THRESHOLD_BASE);
+ ktd2692_expresswire_write(led, KTD2692_FLASH_MODE_CURR_PERCENT(45)
+ | KTD2692_REG_FLASH_CURRENT_BASE);
+}
+
+static void regulator_disable_action(void *_data)
+{
+ struct device *dev = _data;
+ struct ktd2692_context *led = dev_get_drvdata(dev);
+ int ret;
+
+ ret = regulator_disable(led->regulator);
+ if (ret)
+ dev_err(dev, "Failed to disable supply: %d\n", ret);
+}
+
+static int ktd2692_parse_dt(struct ktd2692_context *led, struct device *dev,
+ struct ktd2692_led_config_data *cfg)
+{
+ struct device_node *np = dev_of_node(dev);
+ struct device_node *child_node;
+ int ret;
+
+ if (!dev_of_node(dev))
+ return -ENXIO;
+
+ led->ctrl_gpio = devm_gpiod_get(dev, "ctrl", GPIOD_ASIS);
+ ret = PTR_ERR_OR_ZERO(led->ctrl_gpio);
+ if (ret) {
+ dev_err(dev, "cannot get ctrl-gpios %d\n", ret);
+ return ret;
+ }
+
+ led->aux_gpio = devm_gpiod_get(dev, "aux", GPIOD_ASIS);
+ ret = PTR_ERR_OR_ZERO(led->aux_gpio);
+ if (ret) {
+ dev_err(dev, "cannot get aux-gpios %d\n", ret);
+ return ret;
+ }
+
+ led->regulator = devm_regulator_get(dev, "vin");
+ if (IS_ERR(led->regulator))
+ led->regulator = NULL;
+
+ if (led->regulator) {
+ ret = regulator_enable(led->regulator);
+ if (ret) {
+ dev_err(dev, "Failed to enable supply: %d\n", ret);
+ } else {
+ ret = devm_add_action_or_reset(dev,
+ regulator_disable_action, dev);
+ if (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, "led-max-microamp",
+ &cfg->movie_max_microamp);
+ if (ret) {
+ dev_err(dev, "failed to parse led-max-microamp\n");
+ goto err_parse_dt;
+ }
+
+ ret = of_property_read_u32(child_node, "flash-max-microamp",
+ &cfg->flash_max_microamp);
+ if (ret) {
+ dev_err(dev, "failed to parse flash-max-microamp\n");
+ goto err_parse_dt;
+ }
+
+ ret = of_property_read_u32(child_node, "flash-max-timeout-us",
+ &cfg->flash_max_timeout);
+ if (ret) {
+ dev_err(dev, "failed to parse flash-max-timeout-us\n");
+ goto err_parse_dt;
+ }
+
+err_parse_dt:
+ of_node_put(child_node);
+ return ret;
+}
+
+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_led_config_data led_cfg;
+ 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, &led_cfg);
+ if (ret)
+ return ret;
+
+ ktd2692_init_flash_timeout(fled_cdev, &led_cfg);
+ ktd2692_init_movie_current_max(&led_cfg);
+
+ fled_cdev->ops = &flash_ops;
+
+ led_cdev->max_brightness = led_cfg.max_brightness;
+ led_cdev->brightness_set_blocking = ktd2692_led_brightness_set;
+ led_cdev->flags |= LED_CORE_SUSPENDRESUME | LED_DEV_CAP_FLASH;
+
+ mutex_init(&led->lock);
+
+ 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);
+
+ led_classdev_flash_unregister(&led->fled_cdev);
+
+ mutex_destroy(&led->lock);
+
+ return 0;
+}
+
+static const struct of_device_id ktd2692_match[] = {
+ { .compatible = "kinetic,ktd2692", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ktd2692_match);
+
+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 <ingi2.kim@samsung.com>");
+MODULE_DESCRIPTION("Kinetic KTD2692 LED driver");
+MODULE_LICENSE("GPL v2");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * LED driver : leds-ktd2692.c
- *
- * Copyright (C) 2015 Samsung Electronics
- * Ingi Kim <ingi2.kim@samsung.com>
- */
-
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/gpio/consumer.h>
-#include <linux/led-class-flash.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/regulator/consumer.h>
-
-/* Value related the movie mode */
-#define KTD2692_MOVIE_MODE_CURRENT_LEVELS 16
-#define KTD2692_MM_TO_FL_RATIO(x) ((x) / 3)
-#define KTD2692_MM_MIN_CURR_THRESHOLD_SCALE 8
-
-/* Value related the flash mode */
-#define KTD2692_FLASH_MODE_TIMEOUT_LEVELS 8
-#define KTD2692_FLASH_MODE_TIMEOUT_DISABLE 0
-#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))
-
-/* Base register address */
-#define KTD2692_REG_LVP_BASE 0x00
-#define KTD2692_REG_FLASH_TIMEOUT_BASE 0x20
-#define KTD2692_REG_MM_MIN_CURR_THRESHOLD_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_led_config_data {
- /* maximum LED current in movie mode */
- u32 movie_max_microamp;
- /* maximum LED current in flash mode */
- u32 flash_max_microamp;
- /* maximum flash timeout */
- u32 flash_max_timeout;
- /* max LED brightness level */
- enum led_brightness max_brightness;
-};
-
-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 gpio_desc *aux_gpio;
- struct gpio_desc *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)
-{
- gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
- udelay(KTD2692_TIME_DATA_START_TIME_US);
-}
-
-static void ktd2692_expresswire_reset(struct ktd2692_context *led)
-{
- gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
- udelay(KTD2692_TIME_RESET_US);
-}
-
-static void ktd2692_expresswire_end(struct ktd2692_context *led)
-{
- gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
- udelay(KTD2692_TIME_LOW_END_OF_DATA_US);
- gpiod_direction_output(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 <L_LB> <H_LB> <L_HB> <H_HB>
- * [ Low Bit (0) ] [ High Bit(1) ]
- */
- if (bit) {
- gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
- udelay(KTD2692_TIME_SHORT_BITSET_US);
- gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
- udelay(KTD2692_TIME_LONG_BITSET_US);
- } else {
- gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
- udelay(KTD2692_TIME_LONG_BITSET_US);
- gpiod_direction_output(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 int 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);
-
- mutex_lock(&led->lock);
-
- if (brightness == LED_OFF) {
- led->mode = KTD2692_MODE_DISABLE;
- gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
- } else {
- ktd2692_expresswire_write(led, brightness |
- KTD2692_REG_MOVIE_CURRENT_BASE);
- led->mode = KTD2692_MODE_MOVIE;
- }
-
- ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE);
- mutex_unlock(&led->lock);
-
- 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) {
- 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;
- gpiod_direction_output(led->aux_gpio, KTD2692_HIGH);
- } else {
- led->mode = KTD2692_MODE_DISABLE;
- gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
- }
-
- 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_movie_current_max(struct ktd2692_led_config_data *cfg)
-{
- u32 offset, step;
- u32 movie_current_microamp;
-
- offset = KTD2692_MOVIE_MODE_CURRENT_LEVELS;
- step = KTD2692_MM_TO_FL_RATIO(cfg->flash_max_microamp)
- / KTD2692_MOVIE_MODE_CURRENT_LEVELS;
-
- do {
- movie_current_microamp = step * offset;
- offset--;
- } while ((movie_current_microamp > cfg->movie_max_microamp) &&
- (offset > 0));
-
- cfg->max_brightness = offset;
-}
-
-static void ktd2692_init_flash_timeout(struct led_classdev_flash *fled_cdev,
- struct ktd2692_led_config_data *cfg)
-{
- struct led_flash_setting *setting;
-
- setting = &fled_cdev->timeout;
- setting->min = KTD2692_FLASH_MODE_TIMEOUT_DISABLE;
- setting->max = cfg->flash_max_timeout;
- setting->step = cfg->flash_max_timeout
- / (KTD2692_FLASH_MODE_TIMEOUT_LEVELS - 1);
- setting->val = cfg->flash_max_timeout;
-}
-
-static void ktd2692_setup(struct ktd2692_context *led)
-{
- led->mode = KTD2692_MODE_DISABLE;
- ktd2692_expresswire_reset(led);
- gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
-
- ktd2692_expresswire_write(led, (KTD2692_MM_MIN_CURR_THRESHOLD_SCALE - 1)
- | KTD2692_REG_MM_MIN_CURR_THRESHOLD_BASE);
- ktd2692_expresswire_write(led, KTD2692_FLASH_MODE_CURR_PERCENT(45)
- | KTD2692_REG_FLASH_CURRENT_BASE);
-}
-
-static void regulator_disable_action(void *_data)
-{
- struct device *dev = _data;
- struct ktd2692_context *led = dev_get_drvdata(dev);
- int ret;
-
- ret = regulator_disable(led->regulator);
- if (ret)
- dev_err(dev, "Failed to disable supply: %d\n", ret);
-}
-
-static int ktd2692_parse_dt(struct ktd2692_context *led, struct device *dev,
- struct ktd2692_led_config_data *cfg)
-{
- struct device_node *np = dev_of_node(dev);
- struct device_node *child_node;
- int ret;
-
- if (!dev_of_node(dev))
- return -ENXIO;
-
- led->ctrl_gpio = devm_gpiod_get(dev, "ctrl", GPIOD_ASIS);
- ret = PTR_ERR_OR_ZERO(led->ctrl_gpio);
- if (ret) {
- dev_err(dev, "cannot get ctrl-gpios %d\n", ret);
- return ret;
- }
-
- led->aux_gpio = devm_gpiod_get(dev, "aux", GPIOD_ASIS);
- ret = PTR_ERR_OR_ZERO(led->aux_gpio);
- if (ret) {
- dev_err(dev, "cannot get aux-gpios %d\n", ret);
- return ret;
- }
-
- led->regulator = devm_regulator_get(dev, "vin");
- if (IS_ERR(led->regulator))
- led->regulator = NULL;
-
- if (led->regulator) {
- ret = regulator_enable(led->regulator);
- if (ret) {
- dev_err(dev, "Failed to enable supply: %d\n", ret);
- } else {
- ret = devm_add_action_or_reset(dev,
- regulator_disable_action, dev);
- if (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, "led-max-microamp",
- &cfg->movie_max_microamp);
- if (ret) {
- dev_err(dev, "failed to parse led-max-microamp\n");
- goto err_parse_dt;
- }
-
- ret = of_property_read_u32(child_node, "flash-max-microamp",
- &cfg->flash_max_microamp);
- if (ret) {
- dev_err(dev, "failed to parse flash-max-microamp\n");
- goto err_parse_dt;
- }
-
- ret = of_property_read_u32(child_node, "flash-max-timeout-us",
- &cfg->flash_max_timeout);
- if (ret) {
- dev_err(dev, "failed to parse flash-max-timeout-us\n");
- goto err_parse_dt;
- }
-
-err_parse_dt:
- of_node_put(child_node);
- return ret;
-}
-
-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_led_config_data led_cfg;
- 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, &led_cfg);
- if (ret)
- return ret;
-
- ktd2692_init_flash_timeout(fled_cdev, &led_cfg);
- ktd2692_init_movie_current_max(&led_cfg);
-
- fled_cdev->ops = &flash_ops;
-
- led_cdev->max_brightness = led_cfg.max_brightness;
- led_cdev->brightness_set_blocking = ktd2692_led_brightness_set;
- led_cdev->flags |= LED_CORE_SUSPENDRESUME | LED_DEV_CAP_FLASH;
-
- mutex_init(&led->lock);
-
- 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);
-
- led_classdev_flash_unregister(&led->fled_cdev);
-
- mutex_destroy(&led->lock);
-
- return 0;
-}
-
-static const struct of_device_id ktd2692_match[] = {
- { .compatible = "kinetic,ktd2692", },
- { /* sentinel */ },
-};
-MODULE_DEVICE_TABLE(of, ktd2692_match);
-
-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 <ingi2.kim@samsung.com>");
-MODULE_DESCRIPTION("Kinetic KTD2692 LED driver");
-MODULE_LICENSE("GPL v2");
projects / linux.git / commitdiff