Hi Ingi, Thanks for the update. Few comments below. On 10/12/2015 03:12 PM, Ingi Kim wrote:
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 | 223 +++++++++++++++++++++++++++++++++++++ include/linux/mfd/rt5033-private.h | 49 ++++++++ include/linux/mfd/rt5033.h | 22 +++- 5 files changed, 301 insertions(+), 2 deletions(-) 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..b470c94 --- /dev/null +++ b/drivers/leds/leds-rt5033.c @@ -0,0 +1,223 @@ +/* + * 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/platform_device.h> + +#define RT5033_LED_FLASH_TIMEOUT_MIN 64000 +#define RT5033_LED_FLASH_TIMEOUT_STEPS 32000 +#define RT5033_LED_TORCH_CURRENT_LEVEL_MAX 16 + +/* Macro for getting offset of flash timeout */ +#define GET_TIMEOUT_OFFSET(tm, step) ((tm) / (step) - 2) + +static struct rt5033_led *flcdev_to_led( + struct led_classdev_flash *fled_cdev) +{ + return container_of(fled_cdev, struct rt5033_led, fled_cdev); +} + +static int 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);
I assume that you don't use mutex here deliberately?
+ if (!brightness) { + regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2, + RT5033_FLED_CTRL2_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_CTRL2_MASK, RT5033_FLED_ENFLED); + } + + return 0; +} + +static void rt5033_init_flash_timeout(struct rt5033_led *led) +{ + struct led_flash_setting *setting; + + setting = &led->fled_cdev.timeout; + setting->min = RT5033_LED_FLASH_TIMEOUT_MIN; + setting->max = led->data->flash_max_timeout; + setting->step = RT5033_LED_FLASH_TIMEOUT_STEPS; + setting->val = led->data->flash_max_timeout; +} + +static int rt5033_led_parse_dt(struct rt5033_led *led, struct device *dev) +{ + struct device_node *np = dev->of_node; + struct device_node *child_node; + struct rt5033_led_config_data *data; + int ret = 0; + + if (!np) + return -ENXIO; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM;
This way data will remain allocated until driver removal, whereas you are using it only in rt5033_init_flash_timeout during driver probing AFAICS. Please define local variable in rt5033_led_probe, pass its pointer to this function and than pass the pointer to rt5033_init_flash_timeout.
+ 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", + &data->torch_max_microamp); + if (ret) { + dev_err(dev, "failed to parse led-max-microamp\n"); + return ret; + }
data->torch_max_microamp isn't used anywhere, while it should be used for initializing led_cdev->max_brightness.
+ + ret = of_property_read_u32(child_node, "flash-max-microamp", + &data->flash_max_microamp); + if (ret) { + dev_err(dev, "failed to parse flash-max-microamp\n"); + return ret; + }
data->flash_max_microamp also isn't used anywhere. Does your device support flash brightness setting? If yes then you should implement also flash_brightness_set op. Otherwise this property is redundant.
+ ret = of_property_read_u32(child_node, "flash-max-timeout-us", + &data->flash_max_timeout); + if (ret) + dev_err(dev, "failed to parse flash-max-timeout-us\n"); + + of_node_put(child_node); + led->data = data; + + return ret; +} + +static int rt5033_led_flash_timeout_set(struct led_classdev_flash *fled_cdev, + u32 timeout) +{ + 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); + u32 flash_tm_reg;
I think that you need a mutex here and in rt5033_led_flash_strobe_set. Otherwise following is possible:
Process 1: rt5033_led_flash_strobe_set(led_cdev, 1); regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1, RT5033_FLED_FUNC1_MASK, RT5033_FLED_RESET); fled_cdev->led_cdev.brightness = LED_OFF; Process 2: led_set_brightness(led_cdev, 1); fled_cdev->led_cdev.brightness = 1; rt5033_led_brightness_set(led_cdev, LED_FULL); 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_CTRL2_MASK, RT5033_FLED_ENFLED); Process 1: regmap_update_bits(led->regmap, RT5033_REG_FLED_STROBE_CTRL2, RT5033_FLED_STRBCTRL2_MASK, flash_tm_reg); 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 In a result LED class device will report brightness value 1, whereas it would be inconsistent with hardware state, since flash strobe turns torch mode off.
+ + regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1, + RT5033_FLED_FUNC1_MASK, RT5033_FLED_RESET); + fled_cdev->led_cdev.brightness = LED_OFF;
> +
+ if (state) { + flash_tm_reg = GET_TIMEOUT_OFFSET(fled_cdev->timeout.val, + fled_cdev->timeout.step); + regmap_update_bits(led->regmap, RT5033_REG_FLED_STROBE_CTRL2, + RT5033_FLED_STRBCTRL2_MASK, flash_tm_reg); + 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); + } + + return 0; +} + +static const struct led_flash_ops flash_ops = { + .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; + 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); + if (ret) + return ret; + + rt5033_init_flash_timeout(led); + led->fled_cdev.ops = &flash_ops; + led_cdev = &led->fled_cdev.led_cdev; + + led_cdev->max_brightness = RT5033_LED_TORCH_CURRENT_LEVEL_MAX;
This should depend on led-max-microamp.
+ led_cdev->brightness_set_sync = rt5033_led_brightness_set; + led_cdev->flags |= LED_CORE_SUSPENDRESUME | LED_DEV_CAP_FLASH;
You need also a work queue since your ops can sleep.
+ + 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); + 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); + + 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..6374d84 100644 --- a/include/linux/mfd/rt5033.h +++ b/include/linux/mfd/rt5033.h @@ -12,10 +12,11 @@ #ifndef __RT5033_H__ #define __RT5033_H__ -#include <linux/regulator/consumer.h> #include <linux/i2c.h> -#include <linux/regmap.h> +#include <linux/led-class-flash.h> #include <linux/power_supply.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> /* RT5033 regulator IDs */ enum rt5033_regulators { @@ -59,4 +60,21 @@ struct rt5033_charger { struct rt5033_charger_data *chg; }; +/* RT5033 Flash led platform data */ +struct rt5033_led_config_data { + u32 torch_max_microamp; + u32 flash_max_microamp; + u32 flash_max_timeout; + enum led_brightness max_brightness; +}; + +struct rt5033_led { + struct device *dev; + struct rt5033_dev *rt5033; + struct regmap *regmap; + + struct led_classdev_flash fled_cdev; + struct rt5033_led_config_data *data;
It is not needed to have config data here.
+}; + #endif /* __RT5033_H__ */
-- Best Regards, Jacek Anaszewski -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html