leds: Add driver for AAT1290 flash LED controller

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 <j.anaszewski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

3 files changed, 460 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 62be033100b6..dd7834c32608 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -42,6 +42,14 @@ 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 GPIOLIB
+        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 8bddae6b8ac2..71f7c9accb94 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 000000000000..6ea1d5465309
--- /dev/null
+++ b/drivers/leds/leds-aat1290.c
@@ -0,0 +1,451 @@
+/*
+ *      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>
+ *
+ * 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/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/platform_device.h>
+#include <linux/slab.h>
+#include <linux/workqueue.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
+
+
+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;
+        /* 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;
+
+        /* 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;
+        /* 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;
+
+        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);
+}
+
+static void aat1290_brightness_set(struct aat1290_led *led,
+                                        enum led_brightness brightness)
+{
+        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);
+}
+
+/* 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) {
+                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 led_classdev *led_cdev = &led->fled_cdev.led_cdev;
+        struct device *dev = &led->pdev->dev;
+        struct device_node *child_node;
+        int ret = 0;
+
+        led->gpio_fl_en = devm_gpiod_get(dev, "flen");
+        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");
+        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;
+        }
+
+        child_node = of_get_next_available_child(dev->of_node, NULL);
+        if (!child_node) {
+                dev_err(dev, "No DT child node found for connected LED.\n");
+                return -EINVAL;
+        }
+
+        led_cdev->name = of_get_property(child_node, "label", NULL) ? :
+                                                child_node->name;
+
+        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");
+                return ret;
+        }
+
+        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");
+                return ret;
+        }
+
+        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;
+}
+
+int init_mm_current_scale(struct aat1290_led *led,
+                        struct aat1290_led_config_data *cfg)
+{
+        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 = kzalloc(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)
+{
+        int ret;
+
+        ret = aat1290_led_parse_dt(led, cfg);
+        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);
+
+        kfree(led->mm_current_scale);
+
+        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;
+}
+
+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 aat1290_led *led;
+        struct led_classdev *led_cdev;
+        struct led_classdev_flash *fled_cdev;
+        struct aat1290_led_config_data led_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);
+        if (ret < 0)
+                return ret;
+
+        mutex_init(&led->lock);
+
+        /* Initialize LED Flash class device */
+        led_cdev->brightness_set = aat1290_led_brightness_set;
+        led_cdev->brightness_set_sync = aat1290_led_brightness_set_sync;
+        led_cdev->max_brightness = led_cfg.max_brightness;
+        led_cdev->flags |= LED_DEV_CAP_FLASH;
+        INIT_WORK(&led->work_brightness_set, aat1290_brightness_set_work);
+
+        aat1290_init_flash_timeout(led, &led_cfg);
+
+        /* Register LED Flash class device */
+        ret = led_classdev_flash_register(&pdev->dev, fled_cdev);
+        if (ret < 0)
+                goto err_flash_register;
+
+        return 0;
+
+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);
+
+        led_classdev_flash_unregister(&led->fled_cdev);
+        cancel_work_sync(&led->work_brightness_set);
+
+        mutex_destroy(&led->lock);
+
+        return 0;
+}
+
+static const 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",
+                .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");