[PATCH v3 3/3] leds: rt5033: Add RT5033 Flash led device driver
From: Ingi Kim
Date: Fri Oct 23 2015 - 01:49:13 EST
This patch adds device driver of Richtek RT5033 PMIC.
The driver supports a current regulated output to drive
white LEDs for camera flash.
Signed-off-by: Ingi Kim <ingi2.kim@xxxxxxxxxxx>
---
drivers/leds/Kconfig | 8 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-rt5033.c | 314 +++++++++++++++++++++++++++++++++++++
include/linux/mfd/rt5033-private.h | 49 ++++++
include/linux/mfd/rt5033.h | 13 ++
5 files changed, 385 insertions(+)
create mode 100644 drivers/leds/leds-rt5033.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 42990f2..29613e3 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -345,6 +345,14 @@ config LEDS_PCA963X
LED driver chip accessed via the I2C bus. Supported
devices include PCA9633 and PCA9634
+config LEDS_RT5033
+ tristate "LED support for RT5033 PMIC"
+ depends on LEDS_CLASS_FLASH && OF
+ depends on MFD_RT5033
+ help
+ This option enables support for on-chip LED driver on
+ RT5033 PMIC.
+
config LEDS_WM831X_STATUS
tristate "LED support for status LEDs on WM831x PMICs"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index b503f92..bcc4d93 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_LEDS_COBALT_QUBE) += leds-cobalt-qube.o
obj-$(CONFIG_LEDS_COBALT_RAQ) += leds-cobalt-raq.o
obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunfire.o
obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
+obj-$(CONFIG_LEDS_RT5033) += leds-rt5033.o
obj-$(CONFIG_LEDS_GPIO_REGISTER) += leds-gpio-register.o
obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
diff --git a/drivers/leds/leds-rt5033.c b/drivers/leds/leds-rt5033.c
new file mode 100644
index 0000000..4ba1ec6
--- /dev/null
+++ b/drivers/leds/leds-rt5033.c
@@ -0,0 +1,314 @@
+/*
+ * led driver for RT5033
+ *
+ * Copyright (C) 2015 Samsung Electronics, Co., Ltd.
+ * 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/mfd/rt5033.h>
+#include <linux/mfd/rt5033-private.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+
+#define RT5033_LED_FLASH_TIMEOUT_MIN 64000
+#define RT5033_LED_FLASH_TIMEOUT_STEP 32000
+#define RT5033_LED_FLASH_BRIGHTNESS_MIN 50000
+#define RT5033_LED_FLASH_BRIGHTNESS_STEP 25000
+#define RT5033_LED_TORCH_BRIGHTNESS_MIN 12500
+#define RT5033_LED_TORCH_BRIGHTNESS_STEP 12500
+
+/* Macro to get offset of rt5033_led_config_data */
+#define RT5033_LED_CONFIG_DATA_OFFSET(val, step, min) (((val) - (min)) \
+ / (step))
+
+struct rt5033_led_config_data {
+ u32 flash_max_microamp;
+ u32 flash_max_timeout;
+ u32 torch_max_microamp;
+};
+
+static struct rt5033_led *flcdev_to_led(
+ struct led_classdev_flash *fled_cdev)
+{
+ return container_of(fled_cdev, struct rt5033_led, fled_cdev);
+}
+
+static void rt5033_brightness_set(struct rt5033_led *led,
+ enum led_brightness brightness)
+{
+ mutex_lock(&led->lock);
+
+ if (!brightness) {
+ regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2,
+ RT5033_FLED_FUNC2_MASK, 0x0);
+ } else {
+ regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
+ RT5033_FLED_FUNC1_MASK, RT5033_FLED_PINCTRL);
+ regmap_update_bits(led->regmap, RT5033_REG_FLED_CTRL1,
+ RT5033_FLED_CTRL1_MASK,
+ (brightness - 1) << 4);
+ regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2,
+ RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED);
+ }
+
+ mutex_unlock(&led->lock);
+}
+
+static void rt5033_brightness_set_work(struct work_struct *work)
+{
+ struct rt5033_led *led =
+ container_of(work, struct rt5033_led, work_brightness_set);
+
+ rt5033_brightness_set(led, led->torch_brightness);
+}
+
+static void rt5033_led_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+ struct rt5033_led *led = flcdev_to_led(fled_cdev);
+
+ led->torch_brightness = brightness;
+ schedule_work(&led->work_brightness_set);
+}
+
+static int rt5033_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 rt5033_led *led = flcdev_to_led(fled_cdev);
+
+ rt5033_brightness_set(led, brightness);
+
+ return 0;
+}
+
+static void rt5033_init_flash_properties(struct led_classdev_flash *fled_cdev,
+ struct rt5033_led_config_data *cfg)
+{
+ struct led_flash_setting *tm_set, *fl_set;
+
+ tm_set = &fled_cdev->timeout;
+ tm_set->min = RT5033_LED_FLASH_TIMEOUT_MIN;
+ tm_set->max = cfg->flash_max_timeout;
+ tm_set->step = RT5033_LED_FLASH_TIMEOUT_STEP;
+ tm_set->val = cfg->flash_max_timeout;
+
+ fl_set = &fled_cdev->brightness;
+ fl_set->min = RT5033_LED_FLASH_BRIGHTNESS_MIN;
+ fl_set->max = cfg->flash_max_microamp;
+ fl_set->step = RT5033_LED_FLASH_BRIGHTNESS_STEP;
+ fl_set->val = cfg->flash_max_microamp;
+}
+
+static int rt5033_led_parse_dt(struct rt5033_led *led, struct device *dev,
+ struct rt5033_led_config_data *cfg)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *child_node;
+ int ret = 0;
+
+ if (!np)
+ return -ENXIO;
+
+ child_node = of_get_next_available_child(np, NULL);
+ if (!child_node) {
+ dev_err(dev, "DT child node isn't found\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->torch_max_microamp);
+ if (ret) {
+ dev_err(dev, "failed to parse led-max-microamp\n");
+ return ret;
+ }
+
+ 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");
+ return ret;
+ }
+
+ 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");
+
+ of_node_put(child_node);
+
+ return ret;
+}
+
+static int rt5033_led_flash_brightness_set(struct led_classdev_flash *fled_cdev,
+ u32 brightness)
+{
+ struct rt5033_led *led = flcdev_to_led(fled_cdev);
+ u32 flash_brightness_offset;
+
+ mutex_lock(&led->lock);
+
+ flash_brightness_offset =
+ RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->brightness.val,
+ fled_cdev->brightness.step,
+ fled_cdev->brightness.min);
+
+ regmap_update_bits(led->regmap, RT5033_REG_FLED_STROBE_CTRL1,
+ RT5033_FLED_STRBCTRL1_MASK, flash_brightness_offset);
+
+ mutex_unlock(&led->lock);
+
+ return 0;
+}
+
+static int rt5033_led_flash_timeout_set(struct led_classdev_flash *fled_cdev,
+ u32 timeout)
+{
+ struct rt5033_led *led = flcdev_to_led(fled_cdev);
+ u32 flash_tm_offset;
+
+ mutex_lock(&led->lock);
+
+ flash_tm_offset =
+ RT5033_LED_CONFIG_DATA_OFFSET(fled_cdev->timeout.val,
+ fled_cdev->timeout.step,
+ fled_cdev->timeout.min);
+
+ regmap_update_bits(led->regmap, RT5033_REG_FLED_STROBE_CTRL2,
+ RT5033_FLED_STRBCTRL2_MASK, flash_tm_offset);
+
+ mutex_unlock(&led->lock);
+
+ return 0;
+}
+
+static int rt5033_led_flash_strobe_set(struct led_classdev_flash *fled_cdev,
+ bool state)
+{
+ struct rt5033_led *led = flcdev_to_led(fled_cdev);
+
+ mutex_lock(&led->lock);
+
+ regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2,
+ RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED);
+
+ if (state) {
+ regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
+ RT5033_FLED_FUNC1_MASK, RT5033_FLED_STRB_SEL
+ | RT5033_FLED_PINCTRL);
+ regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2,
+ RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED
+ | RT5033_FLED_SREG_STRB);
+ }
+ fled_cdev->led_cdev.brightness = LED_OFF;
+
+ mutex_unlock(&led->lock);
+
+ return 0;
+}
+
+static const struct led_flash_ops flash_ops = {
+ .flash_brightness_set = rt5033_led_flash_brightness_set,
+ .strobe_set = rt5033_led_flash_strobe_set,
+ .timeout_set = rt5033_led_flash_timeout_set,
+};
+
+static int rt5033_led_probe(struct platform_device *pdev)
+{
+ struct rt5033_dev *rt5033 = dev_get_drvdata(pdev->dev.parent);
+ struct rt5033_led *led;
+ struct led_classdev *led_cdev;
+ struct rt5033_led_config_data led_cfg;
+ int ret;
+
+ led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, led);
+ led->dev = &pdev->dev;
+ led->regmap = rt5033->regmap;
+
+ ret = rt5033_led_parse_dt(led, &pdev->dev, &led_cfg);
+ if (ret)
+ return ret;
+
+ mutex_init(&led->lock);
+ INIT_WORK(&led->work_brightness_set, rt5033_brightness_set_work);
+
+ rt5033_init_flash_properties(&led->fled_cdev, &led_cfg);
+ led->fled_cdev.ops = &flash_ops;
+ led_cdev = &led->fled_cdev.led_cdev;
+
+ led_cdev->max_brightness =
+ RT5033_LED_CONFIG_DATA_OFFSET(led_cfg.torch_max_microamp,
+ RT5033_LED_TORCH_BRIGHTNESS_STEP,
+ RT5033_LED_TORCH_BRIGHTNESS_MIN);
+
+ led_cdev->brightness_set = rt5033_led_brightness_set;
+ led_cdev->brightness_set_sync = rt5033_led_brightness_set_sync;
+ led_cdev->flags |= LED_CORE_SUSPENDRESUME | LED_DEV_CAP_FLASH;
+
+ ret = led_classdev_flash_register(&pdev->dev, &led->fled_cdev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "can't register LED %s\n", led_cdev->name);
+ mutex_destroy(&led->lock);
+ return ret;
+ }
+
+ regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
+ RT5033_FLED_FUNC1_MASK, RT5033_FLED_RESET);
+
+ return 0;
+}
+
+static int rt5033_led_remove(struct platform_device *pdev)
+{
+ struct rt5033_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 platform_device_id rt5033_led_id[] = {
+ { "rt5033-led", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(platform, rt5033_led_id);
+
+static const struct of_device_id rt5033_led_match[] = {
+ { .compatible = "richtek,rt5033-led", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, rt5033_led_match);
+
+static struct platform_driver rt5033_led_driver = {
+ .driver = {
+ .name = "rt5033-led",
+ .of_match_table = rt5033_led_match,
+ },
+ .probe = rt5033_led_probe,
+ .id_table = rt5033_led_id,
+ .remove = rt5033_led_remove,
+};
+module_platform_driver(rt5033_led_driver);
+
+MODULE_AUTHOR("Ingi Kim <ingi2.kim@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Richtek RT5033 LED driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:rt5033-led");
diff --git a/include/linux/mfd/rt5033-private.h b/include/linux/mfd/rt5033-private.h
index 1b63fc2..c8e99e4 100644
--- a/include/linux/mfd/rt5033-private.h
+++ b/include/linux/mfd/rt5033-private.h
@@ -93,6 +93,55 @@ enum rt5033_reg {
#define RT5033_RT_CTRL1_UUG_MASK 0x02
#define RT5033_RT_HZ_MASK 0x01
+/* RT5033 FLED Function1 register */
+#define RT5033_FLED_FUNC1_MASK 0x94
+#define RT5033_FLED_STRB_SEL 0x04
+#define RT5033_FLED_PINCTRL 0x10
+#define RT5033_FLED_RESET 0x80
+
+/* RT5033 FLED Function2 register */
+#define RT5033_FLED_FUNC2_MASK 0x81
+#define RT5033_FLED_ENFLED 0x01
+#define RT5033_FLED_SREG_STRB 0x80
+
+/* RT5033 FLED Strobe Control1 */
+#define RT5033_FLED_STRBCTRL1_MASK 0xFF
+#define RT5033_FLED_STRBCTRL1_TM_CUR_MAX 0xE0
+#define RT5033_FLED_STRBCTRL1_FL_CUR_DEF 0x0D
+#define RT5033_FLED_STRBCTRL1_FL_CUR_MAX 0x1F
+
+/* RT5033 FLED Strobe Control2 */
+#define RT5033_FLED_STRBCTRL2_MASK 0x3F
+#define RT5033_FLED_STRBCTRL2_TM_DEF 0x0F
+#define RT5033_FLED_STRBCTRL2_TM_MAX 0x3F
+
+/* RT5033 FLED Control1 */
+#define RT5033_FLED_CTRL1_MASK 0xF7
+#define RT5033_FLED_CTRL1_TORCH_CUR_DEF 0x20
+#define RT5033_FLED_CTRL1_TORCH_CUR_MAX 0xF0
+#define RT5033_FLED_CTRL1_LBP_DEF 0x02
+#define RT5033_FLED_CTRL1_LBP_MAX 0x07
+
+/* RT5033 FLED Control2 */
+#define RT5033_FLED_CTRL2_MASK 0xFF
+#define RT5033_FLED_CTRL2_VMID_DEF 0x37
+#define RT5033_FLED_CTRL2_VMID_MAX 0x3F
+#define RT5033_FLED_CTRL2_TRACK_ALIVE 0x40
+#define RT5033_FLED_CTRL2_MID_TRACK 0x80
+
+/* RT5033 FLED Control4 */
+#define RT5033_FLED_CTRL4_MASK 0xE0
+#define RT5033_FLED_CTRL4_RESV 0x14
+#define RT5033_FLED_CTRL4_VTRREG_DEF 0x40
+#define RT5033_FLED_CTRL4_VTRREG_MAX 0x60
+#define RT5033_FLED_CTRL4_TRACK_CLK 0x80
+
+/* RT5033 FLED Control5 */
+#define RT5033_FLED_CTRL5_MASK 0xC0
+#define RT5033_FLED_CTRL5_RESV 0x10
+#define RT5033_FLED_CTRL5_TA_GOOD 0x40
+#define RT5033_FLED_CTRL5_TA_EXIST 0x80
+
/* RT5033 control register */
#define RT5033_CTRL_FCCM_BUCK_MASK 0x00
#define RT5033_CTRL_BUCKOMS_MASK 0x01
diff --git a/include/linux/mfd/rt5033.h b/include/linux/mfd/rt5033.h
index 6cff5cf..11f6d48 100644
--- a/include/linux/mfd/rt5033.h
+++ b/include/linux/mfd/rt5033.h
@@ -15,6 +15,7 @@
#include <linux/regulator/consumer.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
+#include <linux/led-class-flash.h>
#include <linux/power_supply.h>
/* RT5033 regulator IDs */
@@ -59,4 +60,16 @@ struct rt5033_charger {
struct rt5033_charger_data *chg;
};
+/* RT5033 Flash led platform data */
+struct rt5033_led {
+ struct device *dev;
+ struct led_classdev_flash fled_cdev;
+ struct mutex lock;
+ struct rt5033_dev *rt5033;
+ struct regmap *regmap;
+ struct work_struct work_brightness_set;
+
+ enum led_brightness torch_brightness;
+};
+
#endif /* __RT5033_H__ */
--
2.0.5
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