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 V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
- depends on GPIOLIB || COMPILE_TEST
- depends on OF
- depends on PINCTRL
- help
- This option enables support for the LEDs on the AAT1290.
-
config LEDS_AN30259A
tristate "LED support for Panasonic AN30259A"
depends on LEDS_CLASS && I2C && OF
# LED Platform Drivers (keep this sorted, M-| sort)
obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o
-obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o
obj-$(CONFIG_LEDS_ACER_A500) += leds-acer-a500.o
obj-$(CONFIG_LEDS_ADP5520) += leds-adp5520.o
obj-$(CONFIG_LEDS_AN30259A) += leds-an30259a.o
if LEDS_CLASS_FLASH
+config LEDS_AAT1290
+ tristate "LED support for the AAT1290"
+ depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
+ depends on GPIOLIB || COMPILE_TEST
+ depends on OF
+ depends on PINCTRL
+ help
+ This option enables support for the LEDs on the AAT1290.
+
config LEDS_RT4505
tristate "LED support for RT4505 flashlight controller"
depends on I2C && OF
# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o
obj-$(CONFIG_LEDS_RT4505) += leds-rt4505.o
obj-$(CONFIG_LEDS_RT8515) += leds-rt8515.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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 <j.anaszewski@samsung.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/led-class-flash.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <media/v4l2-flash-led-class.h>
+
+#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
+
+#define AAT1290_NAME "aat1290"
+
+
+struct aat1290_led_config_data {
+ /* maximum LED current in movie mode */
+ u32 max_mm_current;
+ /* maximum LED current in flash mode */
+ u32 max_flash_current;
+ /* maximum flash timeout */
+ u32 max_flash_tm;
+ /* external strobe capability */
+ bool has_external_strobe;
+ /* max LED brightness level */
+ enum led_brightness max_brightness;
+};
+
+struct aat1290_led {
+ /* platform device data */
+ struct platform_device *pdev;
+ /* secures access to the device */
+ struct mutex lock;
+
+ /* corresponding LED Flash class device */
+ struct led_classdev_flash fled_cdev;
+ /* V4L2 Flash device */
+ struct v4l2_flash *v4l2_flash;
+
+ /* FLEN pin */
+ struct gpio_desc *gpio_fl_en;
+ /* EN|SET pin */
+ struct gpio_desc *gpio_en_set;
+ /* movie mode current scale */
+ int *mm_current_scale;
+ /* device mode */
+ bool movie_mode;
+ /* brightness cache */
+ unsigned int torch_brightness;
+};
+
+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 struct led_classdev_flash *led_cdev_to_fled_cdev(
+ struct led_classdev *led_cdev)
+{
+ return container_of(led_cdev, struct led_classdev_flash, led_cdev);
+}
+
+static void aat1290_as2cwire_write(struct aat1290_led *led, int addr, int value)
+{
+ int i;
+
+ gpiod_direction_output(led->gpio_fl_en, 0);
+ gpiod_direction_output(led->gpio_en_set, 0);
+
+ udelay(AAT1290_FLEN_OFF_DELAY_TIME_US);
+
+ /* write address */
+ for (i = 0; i < addr; ++i) {
+ udelay(AAT1290_EN_SET_TICK_TIME_US);
+ gpiod_direction_output(led->gpio_en_set, 0);
+ udelay(AAT1290_EN_SET_TICK_TIME_US);
+ gpiod_direction_output(led->gpio_en_set, 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);
+ gpiod_direction_output(led->gpio_en_set, 0);
+ udelay(AAT1290_EN_SET_TICK_TIME_US);
+ gpiod_direction_output(led->gpio_en_set, 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);
+}
+
+/* LED subsystem callbacks */
+
+static int aat1290_led_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct led_classdev_flash *fled_cdev = led_cdev_to_fled_cdev(led_cdev);
+ struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
+
+ mutex_lock(&led->lock);
+
+ if (brightness == 0) {
+ gpiod_direction_output(led->gpio_fl_en, 0);
+ gpiod_direction_output(led->gpio_en_set, 0);
+ led->movie_mode = false;
+ } else {
+ 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);
+ }
+
+ mutex_unlock(&led->lock);
+
+ 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) {
+ aat1290_set_flash_safety_timer(led, timeout->val);
+ gpiod_direction_output(led->gpio_fl_en, 1);
+ } else {
+ gpiod_direction_output(led->gpio_fl_en, 0);
+ gpiod_direction_output(led->gpio_en_set, 0);
+ }
+
+ /*
+ * 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 and movie_mode properties needs
+ * to be updated here to reflect the actual state.
+ */
+ led_cdev->brightness = 0;
+ led->movie_mode = false;
+
+ 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 aat1290_led_config_data *cfg,
+ struct device_node **sub_node)
+{
+ struct device *dev = &led->pdev->dev;
+ struct device_node *child_node;
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+ struct pinctrl *pinctrl;
+#endif
+ int ret = 0;
+
+ led->gpio_fl_en = devm_gpiod_get(dev, "flen", GPIOD_ASIS);
+ if (IS_ERR(led->gpio_fl_en)) {
+ ret = PTR_ERR(led->gpio_fl_en);
+ dev_err(dev, "Unable to claim gpio \"flen\".\n");
+ return ret;
+ }
+
+ led->gpio_en_set = devm_gpiod_get(dev, "enset", GPIOD_ASIS);
+ if (IS_ERR(led->gpio_en_set)) {
+ ret = PTR_ERR(led->gpio_en_set);
+ dev_err(dev, "Unable to claim gpio \"enset\".\n");
+ return ret;
+ }
+
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+ pinctrl = devm_pinctrl_get_select_default(&led->pdev->dev);
+ if (IS_ERR(pinctrl)) {
+ cfg->has_external_strobe = false;
+ dev_info(dev,
+ "No support for external strobe detected.\n");
+ } else {
+ cfg->has_external_strobe = true;
+ }
+#endif
+
+ child_node = of_get_next_available_child(dev_of_node(dev), NULL);
+ if (!child_node) {
+ dev_err(dev, "No DT child node found for connected LED.\n");
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32(child_node, "led-max-microamp",
+ &cfg->max_mm_current);
+ /*
+ * led-max-microamp will default to 1/20 of flash-max-microamp
+ * in case it is missing.
+ */
+ if (ret < 0)
+ dev_warn(dev,
+ "led-max-microamp DT property missing\n");
+
+ ret = of_property_read_u32(child_node, "flash-max-microamp",
+ &cfg->max_flash_current);
+ if (ret < 0) {
+ dev_err(dev,
+ "flash-max-microamp DT property missing\n");
+ goto err_parse_dt;
+ }
+
+ ret = of_property_read_u32(child_node, "flash-max-timeout-us",
+ &cfg->max_flash_tm);
+ if (ret < 0) {
+ dev_err(dev,
+ "flash-max-timeout-us DT property missing\n");
+ goto err_parse_dt;
+ }
+
+ *sub_node = child_node;
+
+err_parse_dt:
+ of_node_put(child_node);
+
+ return ret;
+}
+
+static void aat1290_led_validate_mm_current(struct aat1290_led *led,
+ struct aat1290_led_config_data *cfg)
+{
+ int i, b = 0, e = AAT1290_MM_CURRENT_SCALE_SIZE;
+
+ while (e - b > 1) {
+ i = b + (e - b) / 2;
+ if (cfg->max_mm_current < led->mm_current_scale[i])
+ e = i;
+ else
+ b = i;
+ }
+
+ cfg->max_mm_current = led->mm_current_scale[b];
+ cfg->max_brightness = b + 1;
+}
+
+static int init_mm_current_scale(struct aat1290_led *led,
+ struct aat1290_led_config_data *cfg)
+{
+ static const int max_mm_current_percent[] = {
+ 20, 22, 25, 28, 32, 36, 40, 45, 50, 56,
+ 63, 71, 79, 89, 100
+ };
+ int i, max_mm_current =
+ AAT1290_MAX_MM_CURRENT(cfg->max_flash_current);
+
+ led->mm_current_scale = devm_kzalloc(&led->pdev->dev,
+ sizeof(max_mm_current_percent),
+ GFP_KERNEL);
+ if (!led->mm_current_scale)
+ return -ENOMEM;
+
+ for (i = 0; i < AAT1290_MM_CURRENT_SCALE_SIZE; ++i)
+ led->mm_current_scale[i] = max_mm_current *
+ max_mm_current_percent[i] / 100;
+
+ return 0;
+}
+
+static int aat1290_led_get_configuration(struct aat1290_led *led,
+ struct aat1290_led_config_data *cfg,
+ struct device_node **sub_node)
+{
+ int ret;
+
+ ret = aat1290_led_parse_dt(led, cfg, sub_node);
+ if (ret < 0)
+ return ret;
+ /*
+ * Init non-linear movie mode current scale basing
+ * on the max flash current from led configuration.
+ */
+ ret = init_mm_current_scale(led, cfg);
+ if (ret < 0)
+ return ret;
+
+ aat1290_led_validate_mm_current(led, cfg);
+
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+#else
+ devm_kfree(&led->pdev->dev, led->mm_current_scale);
+#endif
+
+ return 0;
+}
+
+static void aat1290_init_flash_timeout(struct aat1290_led *led,
+ struct aat1290_led_config_data *cfg)
+{
+ struct led_classdev_flash *fled_cdev = &led->fled_cdev;
+ struct led_flash_setting *setting;
+
+ /* Init flash timeout setting */
+ setting = &fled_cdev->timeout;
+ setting->min = cfg->max_flash_tm / AAT1290_FLASH_TM_NUM_LEVELS;
+ setting->max = cfg->max_flash_tm;
+ setting->step = setting->min;
+ setting->val = setting->max;
+}
+
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+static enum led_brightness aat1290_intensity_to_brightness(
+ struct v4l2_flash *v4l2_flash,
+ s32 intensity)
+{
+ struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
+ struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
+ int i;
+
+ for (i = AAT1290_MM_CURRENT_SCALE_SIZE - 1; i >= 0; --i)
+ if (intensity >= led->mm_current_scale[i])
+ return i + 1;
+
+ return 1;
+}
+
+static s32 aat1290_brightness_to_intensity(struct v4l2_flash *v4l2_flash,
+ enum led_brightness brightness)
+{
+ struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
+ struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
+
+ return led->mm_current_scale[brightness - 1];
+}
+
+static int aat1290_led_external_strobe_set(struct v4l2_flash *v4l2_flash,
+ bool enable)
+{
+ struct aat1290_led *led = fled_cdev_to_led(v4l2_flash->fled_cdev);
+ struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
+ struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+ struct pinctrl *pinctrl;
+
+ gpiod_direction_output(led->gpio_fl_en, 0);
+ gpiod_direction_output(led->gpio_en_set, 0);
+
+ led->movie_mode = false;
+ led_cdev->brightness = 0;
+
+ pinctrl = devm_pinctrl_get_select(&led->pdev->dev,
+ enable ? "isp" : "host");
+ if (IS_ERR(pinctrl)) {
+ dev_warn(&led->pdev->dev, "Unable to switch strobe source.\n");
+ return PTR_ERR(pinctrl);
+ }
+
+ return 0;
+}
+
+static void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
+ struct aat1290_led_config_data *led_cfg,
+ struct v4l2_flash_config *v4l2_sd_cfg)
+{
+ struct led_classdev *led_cdev = &led->fled_cdev.led_cdev;
+ struct led_flash_setting *s;
+
+ strlcpy(v4l2_sd_cfg->dev_name, led_cdev->dev->kobj.name,
+ sizeof(v4l2_sd_cfg->dev_name));
+
+ s = &v4l2_sd_cfg->intensity;
+ s->min = led->mm_current_scale[0];
+ s->max = led_cfg->max_mm_current;
+ s->step = 1;
+ s->val = s->max;
+
+ v4l2_sd_cfg->has_external_strobe = led_cfg->has_external_strobe;
+}
+
+static const struct v4l2_flash_ops v4l2_flash_ops = {
+ .external_strobe_set = aat1290_led_external_strobe_set,
+ .intensity_to_led_brightness = aat1290_intensity_to_brightness,
+ .led_brightness_to_intensity = aat1290_brightness_to_intensity,
+};
+#else
+static inline void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
+ struct aat1290_led_config_data *led_cfg,
+ struct v4l2_flash_config *v4l2_sd_cfg)
+{
+}
+static const struct v4l2_flash_ops v4l2_flash_ops;
+#endif
+
+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 *sub_node = NULL;
+ struct aat1290_led *led;
+ struct led_classdev *led_cdev;
+ struct led_classdev_flash *fled_cdev;
+ struct led_init_data init_data = {};
+ struct aat1290_led_config_data led_cfg = {};
+ struct v4l2_flash_config v4l2_sd_cfg = {};
+ int ret;
+
+ led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ led->pdev = pdev;
+ platform_set_drvdata(pdev, led);
+
+ fled_cdev = &led->fled_cdev;
+ fled_cdev->ops = &flash_ops;
+ led_cdev = &fled_cdev->led_cdev;
+
+ ret = aat1290_led_get_configuration(led, &led_cfg, &sub_node);
+ if (ret < 0)
+ return ret;
+
+ mutex_init(&led->lock);
+
+ /* Initialize LED Flash class device */
+ led_cdev->brightness_set_blocking = aat1290_led_brightness_set;
+ led_cdev->max_brightness = led_cfg.max_brightness;
+ led_cdev->flags |= LED_DEV_CAP_FLASH;
+
+ aat1290_init_flash_timeout(led, &led_cfg);
+
+ init_data.fwnode = of_fwnode_handle(sub_node);
+ init_data.devicename = AAT1290_NAME;
+
+ /* Register LED Flash class device */
+ ret = led_classdev_flash_register_ext(&pdev->dev, fled_cdev,
+ &init_data);
+ if (ret < 0)
+ goto err_flash_register;
+
+ aat1290_init_v4l2_flash_config(led, &led_cfg, &v4l2_sd_cfg);
+
+ /* Create V4L2 Flash subdev. */
+ led->v4l2_flash = v4l2_flash_init(dev, of_fwnode_handle(sub_node),
+ fled_cdev, &v4l2_flash_ops,
+ &v4l2_sd_cfg);
+ if (IS_ERR(led->v4l2_flash)) {
+ ret = PTR_ERR(led->v4l2_flash);
+ goto error_v4l2_flash_init;
+ }
+
+ return 0;
+
+error_v4l2_flash_init:
+ led_classdev_flash_unregister(fled_cdev);
+err_flash_register:
+ mutex_destroy(&led->lock);
+
+ return ret;
+}
+
+static int aat1290_led_remove(struct platform_device *pdev)
+{
+ struct aat1290_led *led = platform_get_drvdata(pdev);
+
+ v4l2_flash_release(led->v4l2_flash);
+ led_classdev_flash_unregister(&led->fled_cdev);
+
+ mutex_destroy(&led->lock);
+
+ return 0;
+}
+
+static const struct of_device_id aat1290_led_dt_match[] = {
+ { .compatible = "skyworks,aat1290" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, aat1290_led_dt_match);
+
+static struct platform_driver aat1290_led_driver = {
+ .probe = aat1290_led_probe,
+ .remove = aat1290_led_remove,
+ .driver = {
+ .name = "aat1290",
+ .of_match_table = aat1290_led_dt_match,
+ },
+};
+
+module_platform_driver(aat1290_led_driver);
+
+MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
+MODULE_DESCRIPTION("Skyworks Current Regulator for Flash LEDs");
+MODULE_LICENSE("GPL v2");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * 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 <j.anaszewski@samsung.com>
- */
-
-#include <linux/delay.h>
-#include <linux/gpio/consumer.h>
-#include <linux/led-class-flash.h>
-#include <linux/leds.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/of.h>
-#include <linux/pinctrl/consumer.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <media/v4l2-flash-led-class.h>
-
-#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
-
-#define AAT1290_NAME "aat1290"
-
-
-struct aat1290_led_config_data {
- /* maximum LED current in movie mode */
- u32 max_mm_current;
- /* maximum LED current in flash mode */
- u32 max_flash_current;
- /* maximum flash timeout */
- u32 max_flash_tm;
- /* external strobe capability */
- bool has_external_strobe;
- /* max LED brightness level */
- enum led_brightness max_brightness;
-};
-
-struct aat1290_led {
- /* platform device data */
- struct platform_device *pdev;
- /* secures access to the device */
- struct mutex lock;
-
- /* corresponding LED Flash class device */
- struct led_classdev_flash fled_cdev;
- /* V4L2 Flash device */
- struct v4l2_flash *v4l2_flash;
-
- /* FLEN pin */
- struct gpio_desc *gpio_fl_en;
- /* EN|SET pin */
- struct gpio_desc *gpio_en_set;
- /* movie mode current scale */
- int *mm_current_scale;
- /* device mode */
- bool movie_mode;
- /* brightness cache */
- unsigned int torch_brightness;
-};
-
-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 struct led_classdev_flash *led_cdev_to_fled_cdev(
- struct led_classdev *led_cdev)
-{
- return container_of(led_cdev, struct led_classdev_flash, led_cdev);
-}
-
-static void aat1290_as2cwire_write(struct aat1290_led *led, int addr, int value)
-{
- int i;
-
- gpiod_direction_output(led->gpio_fl_en, 0);
- gpiod_direction_output(led->gpio_en_set, 0);
-
- udelay(AAT1290_FLEN_OFF_DELAY_TIME_US);
-
- /* write address */
- for (i = 0; i < addr; ++i) {
- udelay(AAT1290_EN_SET_TICK_TIME_US);
- gpiod_direction_output(led->gpio_en_set, 0);
- udelay(AAT1290_EN_SET_TICK_TIME_US);
- gpiod_direction_output(led->gpio_en_set, 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);
- gpiod_direction_output(led->gpio_en_set, 0);
- udelay(AAT1290_EN_SET_TICK_TIME_US);
- gpiod_direction_output(led->gpio_en_set, 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);
-}
-
-/* LED subsystem callbacks */
-
-static int aat1290_led_brightness_set(struct led_classdev *led_cdev,
- enum led_brightness brightness)
-{
- struct led_classdev_flash *fled_cdev = led_cdev_to_fled_cdev(led_cdev);
- struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
-
- mutex_lock(&led->lock);
-
- if (brightness == 0) {
- gpiod_direction_output(led->gpio_fl_en, 0);
- gpiod_direction_output(led->gpio_en_set, 0);
- led->movie_mode = false;
- } else {
- 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);
- }
-
- mutex_unlock(&led->lock);
-
- 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) {
- aat1290_set_flash_safety_timer(led, timeout->val);
- gpiod_direction_output(led->gpio_fl_en, 1);
- } else {
- gpiod_direction_output(led->gpio_fl_en, 0);
- gpiod_direction_output(led->gpio_en_set, 0);
- }
-
- /*
- * 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 and movie_mode properties needs
- * to be updated here to reflect the actual state.
- */
- led_cdev->brightness = 0;
- led->movie_mode = false;
-
- 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 aat1290_led_config_data *cfg,
- struct device_node **sub_node)
-{
- struct device *dev = &led->pdev->dev;
- struct device_node *child_node;
-#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
- struct pinctrl *pinctrl;
-#endif
- int ret = 0;
-
- led->gpio_fl_en = devm_gpiod_get(dev, "flen", GPIOD_ASIS);
- if (IS_ERR(led->gpio_fl_en)) {
- ret = PTR_ERR(led->gpio_fl_en);
- dev_err(dev, "Unable to claim gpio \"flen\".\n");
- return ret;
- }
-
- led->gpio_en_set = devm_gpiod_get(dev, "enset", GPIOD_ASIS);
- if (IS_ERR(led->gpio_en_set)) {
- ret = PTR_ERR(led->gpio_en_set);
- dev_err(dev, "Unable to claim gpio \"enset\".\n");
- return ret;
- }
-
-#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
- pinctrl = devm_pinctrl_get_select_default(&led->pdev->dev);
- if (IS_ERR(pinctrl)) {
- cfg->has_external_strobe = false;
- dev_info(dev,
- "No support for external strobe detected.\n");
- } else {
- cfg->has_external_strobe = true;
- }
-#endif
-
- child_node = of_get_next_available_child(dev_of_node(dev), NULL);
- if (!child_node) {
- dev_err(dev, "No DT child node found for connected LED.\n");
- return -EINVAL;
- }
-
- ret = of_property_read_u32(child_node, "led-max-microamp",
- &cfg->max_mm_current);
- /*
- * led-max-microamp will default to 1/20 of flash-max-microamp
- * in case it is missing.
- */
- if (ret < 0)
- dev_warn(dev,
- "led-max-microamp DT property missing\n");
-
- ret = of_property_read_u32(child_node, "flash-max-microamp",
- &cfg->max_flash_current);
- if (ret < 0) {
- dev_err(dev,
- "flash-max-microamp DT property missing\n");
- goto err_parse_dt;
- }
-
- ret = of_property_read_u32(child_node, "flash-max-timeout-us",
- &cfg->max_flash_tm);
- if (ret < 0) {
- dev_err(dev,
- "flash-max-timeout-us DT property missing\n");
- goto err_parse_dt;
- }
-
- *sub_node = child_node;
-
-err_parse_dt:
- of_node_put(child_node);
-
- return ret;
-}
-
-static void aat1290_led_validate_mm_current(struct aat1290_led *led,
- struct aat1290_led_config_data *cfg)
-{
- int i, b = 0, e = AAT1290_MM_CURRENT_SCALE_SIZE;
-
- while (e - b > 1) {
- i = b + (e - b) / 2;
- if (cfg->max_mm_current < led->mm_current_scale[i])
- e = i;
- else
- b = i;
- }
-
- cfg->max_mm_current = led->mm_current_scale[b];
- cfg->max_brightness = b + 1;
-}
-
-static int init_mm_current_scale(struct aat1290_led *led,
- struct aat1290_led_config_data *cfg)
-{
- static const int max_mm_current_percent[] = {
- 20, 22, 25, 28, 32, 36, 40, 45, 50, 56,
- 63, 71, 79, 89, 100
- };
- int i, max_mm_current =
- AAT1290_MAX_MM_CURRENT(cfg->max_flash_current);
-
- led->mm_current_scale = devm_kzalloc(&led->pdev->dev,
- sizeof(max_mm_current_percent),
- GFP_KERNEL);
- if (!led->mm_current_scale)
- return -ENOMEM;
-
- for (i = 0; i < AAT1290_MM_CURRENT_SCALE_SIZE; ++i)
- led->mm_current_scale[i] = max_mm_current *
- max_mm_current_percent[i] / 100;
-
- return 0;
-}
-
-static int aat1290_led_get_configuration(struct aat1290_led *led,
- struct aat1290_led_config_data *cfg,
- struct device_node **sub_node)
-{
- int ret;
-
- ret = aat1290_led_parse_dt(led, cfg, sub_node);
- if (ret < 0)
- return ret;
- /*
- * Init non-linear movie mode current scale basing
- * on the max flash current from led configuration.
- */
- ret = init_mm_current_scale(led, cfg);
- if (ret < 0)
- return ret;
-
- aat1290_led_validate_mm_current(led, cfg);
-
-#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
-#else
- devm_kfree(&led->pdev->dev, led->mm_current_scale);
-#endif
-
- return 0;
-}
-
-static void aat1290_init_flash_timeout(struct aat1290_led *led,
- struct aat1290_led_config_data *cfg)
-{
- struct led_classdev_flash *fled_cdev = &led->fled_cdev;
- struct led_flash_setting *setting;
-
- /* Init flash timeout setting */
- setting = &fled_cdev->timeout;
- setting->min = cfg->max_flash_tm / AAT1290_FLASH_TM_NUM_LEVELS;
- setting->max = cfg->max_flash_tm;
- setting->step = setting->min;
- setting->val = setting->max;
-}
-
-#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
-static enum led_brightness aat1290_intensity_to_brightness(
- struct v4l2_flash *v4l2_flash,
- s32 intensity)
-{
- struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
- struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
- int i;
-
- for (i = AAT1290_MM_CURRENT_SCALE_SIZE - 1; i >= 0; --i)
- if (intensity >= led->mm_current_scale[i])
- return i + 1;
-
- return 1;
-}
-
-static s32 aat1290_brightness_to_intensity(struct v4l2_flash *v4l2_flash,
- enum led_brightness brightness)
-{
- struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
- struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
-
- return led->mm_current_scale[brightness - 1];
-}
-
-static int aat1290_led_external_strobe_set(struct v4l2_flash *v4l2_flash,
- bool enable)
-{
- struct aat1290_led *led = fled_cdev_to_led(v4l2_flash->fled_cdev);
- struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
- struct led_classdev *led_cdev = &fled_cdev->led_cdev;
- struct pinctrl *pinctrl;
-
- gpiod_direction_output(led->gpio_fl_en, 0);
- gpiod_direction_output(led->gpio_en_set, 0);
-
- led->movie_mode = false;
- led_cdev->brightness = 0;
-
- pinctrl = devm_pinctrl_get_select(&led->pdev->dev,
- enable ? "isp" : "host");
- if (IS_ERR(pinctrl)) {
- dev_warn(&led->pdev->dev, "Unable to switch strobe source.\n");
- return PTR_ERR(pinctrl);
- }
-
- return 0;
-}
-
-static void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
- struct aat1290_led_config_data *led_cfg,
- struct v4l2_flash_config *v4l2_sd_cfg)
-{
- struct led_classdev *led_cdev = &led->fled_cdev.led_cdev;
- struct led_flash_setting *s;
-
- strlcpy(v4l2_sd_cfg->dev_name, led_cdev->dev->kobj.name,
- sizeof(v4l2_sd_cfg->dev_name));
-
- s = &v4l2_sd_cfg->intensity;
- s->min = led->mm_current_scale[0];
- s->max = led_cfg->max_mm_current;
- s->step = 1;
- s->val = s->max;
-
- v4l2_sd_cfg->has_external_strobe = led_cfg->has_external_strobe;
-}
-
-static const struct v4l2_flash_ops v4l2_flash_ops = {
- .external_strobe_set = aat1290_led_external_strobe_set,
- .intensity_to_led_brightness = aat1290_intensity_to_brightness,
- .led_brightness_to_intensity = aat1290_brightness_to_intensity,
-};
-#else
-static inline void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
- struct aat1290_led_config_data *led_cfg,
- struct v4l2_flash_config *v4l2_sd_cfg)
-{
-}
-static const struct v4l2_flash_ops v4l2_flash_ops;
-#endif
-
-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 *sub_node = NULL;
- struct aat1290_led *led;
- struct led_classdev *led_cdev;
- struct led_classdev_flash *fled_cdev;
- struct led_init_data init_data = {};
- struct aat1290_led_config_data led_cfg = {};
- struct v4l2_flash_config v4l2_sd_cfg = {};
- int ret;
-
- led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
- if (!led)
- return -ENOMEM;
-
- led->pdev = pdev;
- platform_set_drvdata(pdev, led);
-
- fled_cdev = &led->fled_cdev;
- fled_cdev->ops = &flash_ops;
- led_cdev = &fled_cdev->led_cdev;
-
- ret = aat1290_led_get_configuration(led, &led_cfg, &sub_node);
- if (ret < 0)
- return ret;
-
- mutex_init(&led->lock);
-
- /* Initialize LED Flash class device */
- led_cdev->brightness_set_blocking = aat1290_led_brightness_set;
- led_cdev->max_brightness = led_cfg.max_brightness;
- led_cdev->flags |= LED_DEV_CAP_FLASH;
-
- aat1290_init_flash_timeout(led, &led_cfg);
-
- init_data.fwnode = of_fwnode_handle(sub_node);
- init_data.devicename = AAT1290_NAME;
-
- /* Register LED Flash class device */
- ret = led_classdev_flash_register_ext(&pdev->dev, fled_cdev,
- &init_data);
- if (ret < 0)
- goto err_flash_register;
-
- aat1290_init_v4l2_flash_config(led, &led_cfg, &v4l2_sd_cfg);
-
- /* Create V4L2 Flash subdev. */
- led->v4l2_flash = v4l2_flash_init(dev, of_fwnode_handle(sub_node),
- fled_cdev, &v4l2_flash_ops,
- &v4l2_sd_cfg);
- if (IS_ERR(led->v4l2_flash)) {
- ret = PTR_ERR(led->v4l2_flash);
- goto error_v4l2_flash_init;
- }
-
- return 0;
-
-error_v4l2_flash_init:
- led_classdev_flash_unregister(fled_cdev);
-err_flash_register:
- mutex_destroy(&led->lock);
-
- return ret;
-}
-
-static int aat1290_led_remove(struct platform_device *pdev)
-{
- struct aat1290_led *led = platform_get_drvdata(pdev);
-
- v4l2_flash_release(led->v4l2_flash);
- led_classdev_flash_unregister(&led->fled_cdev);
-
- mutex_destroy(&led->lock);
-
- return 0;
-}
-
-static const struct of_device_id aat1290_led_dt_match[] = {
- { .compatible = "skyworks,aat1290" },
- {},
-};
-MODULE_DEVICE_TABLE(of, aat1290_led_dt_match);
-
-static struct platform_driver aat1290_led_driver = {
- .probe = aat1290_led_probe,
- .remove = aat1290_led_remove,
- .driver = {
- .name = "aat1290",
- .of_match_table = aat1290_led_dt_match,
- },
-};
-
-module_platform_driver(aat1290_led_driver);
-
-MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
-MODULE_DESCRIPTION("Skyworks Current Regulator for Flash LEDs");
-MODULE_LICENSE("GPL v2");
projects / linux.git / commitdiff