This patch adds led-flash support to Maxim max77693 chipset. A device can be exposed to user space through LED subsystem sysfs interface or through V4L2 subdevice when the support for V4L2 Flash sub-devices is enabled. Device supports up to two leds which can work in flash and torch mode. Leds can be triggered externally or by software. Signed-off-by: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx> Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx> Acked-by: Lee Jones <lee.jones@xxxxxxxxxx> Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> Cc: Bryan Wu <cooloney@xxxxxxxxx> Cc: Richard Purdie <rpurdie@xxxxxxxxx> Cc: SangYoung Son <hello.son@xxxxxxxxxxx> Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx> --- drivers/leds/Kconfig | 9 + drivers/leds/Makefile | 1 + drivers/leds/leds-max77693.c | 1070 ++++++++++++++++++++++++++++++++++++++++++ drivers/mfd/max77693.c | 5 +- include/linux/mfd/max77693.h | 40 ++ 5 files changed, 1124 insertions(+), 1 deletion(-) create mode 100644 drivers/leds/leds-max77693.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 5032c6f..794055e 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -457,6 +457,15 @@ config LEDS_TCA6507 LED driver chips accessed via the I2C bus. Driver support brightness control and hardware-assisted blinking. +config LEDS_MAX77693 + tristate "LED support for MAX77693 Flash" + depends on LEDS_CLASS_FLASH + depends on MFD_MAX77693 + help + This option enables support for the flash part of the MAX77693 + multifunction device. It has build in control for two leds in flash + and torch mode. + config LEDS_MAX8997 tristate "LED support for MAX8997 PMIC" depends on LEDS_CLASS && MFD_MAX8997 diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 237c5ba..da1a4ba 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -55,6 +55,7 @@ obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o obj-$(CONFIG_LEDS_NS2) += leds-ns2.o obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o +obj-$(CONFIG_LEDS_MAX77693) += leds-max77693.o obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o diff --git a/drivers/leds/leds-max77693.c b/drivers/leds/leds-max77693.c new file mode 100644 index 0000000..38a2398 --- /dev/null +++ b/drivers/leds/leds-max77693.c @@ -0,0 +1,1070 @@ +/* + * LED Flash Class driver for the flash cell of max77693 mfd. + * + * Copyright (C) 2014, Samsung Electronics Co., Ltd. + * + * Authors: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx> + * Andrzej Hajda <a.hajda@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 <asm/div64.h> +#include <linux/led-class-flash.h> +#include <linux/led-flash-manager.h> +#include <linux/mfd/max77693.h> +#include <linux/mfd/max77693-private.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/workqueue.h> +#include <media/v4l2-flash.h> + +#define MAX77693_LED_NAME_1 "max77693-flash_1" +#define MAX77693_LED_NAME_2 "max77693-flash_2" + +#define MAX77693_TORCH_IOUT_BITS 4 + +#define MAX77693_TORCH_NO_TIMER 0x40 +#define MAX77693_FLASH_TIMER_LEVEL 0x80 + +#define MAX77693_FLASH_EN_OFF 0 +#define MAX77693_FLASH_EN_FLASH 1 +#define MAX77693_FLASH_EN_TORCH 2 +#define MAX77693_FLASH_EN_ON 3 + +#define MAX77693_FLASH_EN1_SHIFT 6 +#define MAX77693_FLASH_EN2_SHIFT 4 +#define MAX77693_TORCH_EN1_SHIFT 2 +#define MAX77693_TORCH_EN2_SHIFT 0 + +#define MAX77693_FLASH_LOW_BATTERY_EN 0x80 + +#define MAX77693_FLASH_BOOST_FIXED 0x04 +#define MAX77693_FLASH_BOOST_LEDNUM_2 0x80 + +#define MAX77693_FLASH_TIMEOUT_MIN 62500 +#define MAX77693_FLASH_TIMEOUT_MAX 1000000 +#define MAX77693_FLASH_TIMEOUT_STEP 62500 + +#define MAX77693_TORCH_TIMEOUT_MIN 262000 +#define MAX77693_TORCH_TIMEOUT_MAX 15728000 + +#define MAX77693_FLASH_IOUT_MIN 15625 +#define MAX77693_FLASH_IOUT_MAX_1LED 1000000 +#define MAX77693_FLASH_IOUT_MAX_2LEDS 625000 +#define MAX77693_FLASH_IOUT_STEP 15625 + +#define MAX77693_TORCH_IOUT_MIN 15625 +#define MAX77693_TORCH_IOUT_MAX 250000 +#define MAX77693_TORCH_IOUT_STEP 15625 + +#define MAX77693_FLASH_VSYS_MIN 2400 +#define MAX77693_FLASH_VSYS_MAX 3400 +#define MAX77693_FLASH_VSYS_STEP 33 + +#define MAX77693_FLASH_VOUT_MIN 3300 +#define MAX77693_FLASH_VOUT_MAX 5500 +#define MAX77693_FLASH_VOUT_STEP 25 +#define MAX77693_FLASH_VOUT_RMIN 0x0c + +#define MAX77693_LED_STATUS_FLASH_ON (1 << 3) +#define MAX77693_LED_STATUS_TORCH_ON (1 << 2) + +#define MAX77693_LED_FLASH_INT_FLED2_OPEN (1 << 0) +#define MAX77693_LED_FLASH_INT_FLED2_SHORT (1 << 1) +#define MAX77693_LED_FLASH_INT_FLED1_OPEN (1 << 2) +#define MAX77693_LED_FLASH_INT_FLED1_SHORT (1 << 3) +#define MAX77693_LED_FLASH_INT_OVER_CURRENT (1 << 4) + +#define MAX77693_MODE_OFF 0 +#define MAX77693_MODE_FLASH1 (1 << 0) +#define MAX77693_MODE_FLASH2 (1 << 1) +#define MAX77693_MODE_TORCH1 (1 << 2) +#define MAX77693_MODE_TORCH2 (1 << 3) +#define MAX77693_MODE_FLASH_EXTERNAL1 (1 << 4) +#define MAX77693_MODE_FLASH_EXTERNAL2 (1 << 5) + +enum { + FLED1, + FLED2 +}; + +enum { + FLASH, + TORCH +}; + +struct max77693_led { + struct regmap *regmap; + struct platform_device *pdev; + struct max77693_led_platform_data *pdata; + struct mutex lock; + + struct led_classdev_flash ldev1; + struct work_struct work1_brightness_set; + struct v4l2_flash *v4l2_flash1; + + struct led_classdev_flash ldev2; + struct work_struct work2_brightness_set; + struct v4l2_flash *v4l2_flash2; + + unsigned int torch1_brightness; + unsigned int torch2_brightness; + unsigned int flash1_timeout; + unsigned int flash2_timeout; + unsigned int current_flash_timeout; + unsigned int mode_flags; + u8 torch_iout_reg; + bool iout_joint; +}; + +struct max77693_led_settings { + struct led_flash_setting torch_brightness; + struct led_flash_setting flash_brightness; + struct led_flash_setting flash_timeout; +}; + +static u8 max77693_led_iout_to_reg(u32 ua) +{ + if (ua < MAX77693_FLASH_IOUT_MIN) + ua = MAX77693_FLASH_IOUT_MIN; + return (ua - MAX77693_FLASH_IOUT_MIN) / MAX77693_FLASH_IOUT_STEP; +} + +static u8 max77693_flash_timeout_to_reg(u32 us) +{ + return (us - MAX77693_FLASH_TIMEOUT_MIN) / MAX77693_FLASH_TIMEOUT_STEP; +} + +static inline struct max77693_led *ldev1_to_led( + struct led_classdev_flash *ldev1) +{ + return container_of(ldev1, struct max77693_led, ldev1); +} + +static inline struct max77693_led *ldev2_to_led( + struct led_classdev_flash *ldev2) +{ + return container_of(ldev2, struct max77693_led, ldev2); +} + +static u8 max77693_led_vsys_to_reg(u32 mv) +{ + return ((mv - MAX77693_FLASH_VSYS_MIN) / MAX77693_FLASH_VSYS_STEP) << 2; +} + +static u8 max77693_led_vout_to_reg(u32 mv) +{ + return (mv - MAX77693_FLASH_VOUT_MIN) / MAX77693_FLASH_VOUT_STEP + + MAX77693_FLASH_VOUT_RMIN; +} + +/* split composite current @i into two @iout according to @imax weights */ +static void max77693_calc_iout(u32 iout[2], u32 i, u32 imax[2]) +{ + u64 t = i; + + t *= imax[1]; + do_div(t, imax[0] + imax[1]); + + iout[1] = (u32)t / MAX77693_FLASH_IOUT_STEP * MAX77693_FLASH_IOUT_STEP; + iout[0] = i - iout[1]; +} + +static int max77693_set_mode(struct max77693_led *led, unsigned int mode) +{ + struct max77693_led_platform_data *p = led->pdata; + struct regmap *rmap = led->regmap; + int ret, v = 0; + + if (mode & MAX77693_MODE_TORCH1) { + if (p->trigger[FLED1] & MAX77693_LED_TRIG_SOFT) + v |= MAX77693_FLASH_EN_ON << MAX77693_TORCH_EN1_SHIFT; + } + + if (mode & MAX77693_MODE_TORCH2) { + if (p->trigger[FLED2] & MAX77693_LED_TRIG_SOFT) + v |= MAX77693_FLASH_EN_ON << MAX77693_TORCH_EN2_SHIFT; + } + + if (mode & MAX77693_MODE_FLASH1) { + if (p->trigger[FLED1] & MAX77693_LED_TRIG_SOFT) + v |= MAX77693_FLASH_EN_ON << MAX77693_FLASH_EN1_SHIFT; + } else if (mode & MAX77693_MODE_FLASH_EXTERNAL1) { + if (p->trigger[FLED1] & MAX77693_LED_TRIG_EXT) + v |= MAX77693_FLASH_EN_FLASH << MAX77693_FLASH_EN1_SHIFT; + /* + * Enable hw triggering also for torch mode, as some camera + * sensors use torch led to fathom ambient light conditions + * before strobing the flash. + */ + if (p->trigger[FLED1] & MAX77693_LED_TRIG_EXT) + v |= MAX77693_FLASH_EN_TORCH << MAX77693_TORCH_EN1_SHIFT; + } + + if (mode & MAX77693_MODE_FLASH2) { + if (p->trigger[FLED2] & MAX77693_LED_TRIG_SOFT) + v |= MAX77693_FLASH_EN_ON << MAX77693_FLASH_EN2_SHIFT; + } else if (mode & MAX77693_MODE_FLASH_EXTERNAL1) { + if (p->trigger[FLED2] & MAX77693_LED_TRIG_EXT) + v |= MAX77693_FLASH_EN_FLASH << MAX77693_FLASH_EN2_SHIFT; + /* + * Enable hw triggering also for torch mode, as some camera + * sensors use torch led to fathom ambient light conditions + * before strobing the flash. + */ + if (p->trigger[FLED2] & MAX77693_LED_TRIG_EXT) + v |= MAX77693_FLASH_EN_TORCH << MAX77693_TORCH_EN2_SHIFT; + } + + /* Reset the register only prior setting flash modes */ + if (mode & ~(MAX77693_MODE_TORCH1 | MAX77693_MODE_TORCH2)) { + ret = regmap_write(rmap, MAX77693_LED_REG_FLASH_EN, 0); + if (ret < 0) + return ret; + } + + return regmap_write(rmap, MAX77693_LED_REG_FLASH_EN, v); +} + +static int max77693_add_mode(struct max77693_led *led, unsigned int mode) +{ + int ret; + + /* Span mode on FLED2 for joint iouts case */ + if (led->iout_joint) + mode |= (mode << 1); + + /* + * Torch mode once enabled remains active until turned off, + * and thus no action is required in this case. + */ + if ((mode & MAX77693_MODE_TORCH1) && + (led->mode_flags & MAX77693_MODE_TORCH1)) + return 0; + if ((mode & MAX77693_MODE_TORCH2) && + (led->mode_flags & MAX77693_MODE_TORCH2)) + return 0; + /* + * FLASH_EXTERNAL mode activates HW triggered flash and torch + * modes in the device. The related register settings interfere + * with SW triggerred modes, thus clear them to ensure proper + * device configuration. + */ + if (mode & MAX77693_MODE_FLASH_EXTERNAL1) + led->mode_flags &= (~MAX77693_MODE_TORCH1 & + ~MAX77693_MODE_FLASH1); + if (mode & MAX77693_MODE_FLASH_EXTERNAL2) + led->mode_flags &= (~MAX77693_MODE_TORCH2 & + ~MAX77693_MODE_FLASH2); + + led->mode_flags |= mode; + + ret = max77693_set_mode(led, led->mode_flags); + if (ret < 0) + return ret; + + /* + * Clear flash mode flag after setting the mode to avoid + * spurous flash strobing on every subsequent torch mode + * setting. + */ + if (mode & MAX77693_MODE_FLASH1 || + mode & MAX77693_MODE_FLASH_EXTERNAL1 || + mode & MAX77693_MODE_FLASH2 || + mode & MAX77693_MODE_FLASH_EXTERNAL2) + led->mode_flags &= ~mode; + + return ret; +} + +static int max77693_clear_mode(struct max77693_led *led, unsigned int mode) +{ + int ret; + + /* Span mode on FLED2 for joint iouts case */ + if (led->iout_joint) + mode |= (mode << 1); + + led->mode_flags &= ~mode; + + ret = max77693_set_mode(led, led->mode_flags); + + return ret; +} + +static int max77693_set_torch_current(struct max77693_led *led, + int led_id, + u32 micro_amp) +{ + struct max77693_led_platform_data *p = led->pdata; + struct regmap *rmap = led->regmap; + u32 iout[2], iout_max[2]; + u8 iout1_reg = 0, iout2_reg = 0; + + iout_max[FLED1] = p->iout_torch[FLED1]; + iout_max[FLED2] = p->iout_torch[FLED2]; + + if (led_id == FLED1) { + /* + * Preclude splitting current to FLED2 if we + * are driving two separate leds. + */ + if (!led->iout_joint) + iout_max[FLED2] = 0; + max77693_calc_iout(iout, micro_amp, iout_max); + } else if (led_id == FLED2) { + iout_max[FLED1] = 0; + max77693_calc_iout(iout, micro_amp, iout_max); + } + + if (led_id == FLED1 || led->iout_joint) { + iout1_reg = max77693_led_iout_to_reg(iout[FLED1]); + led->torch_iout_reg &= 0xf0; + } + if (led_id == FLED2 || led->iout_joint) { + iout2_reg = max77693_led_iout_to_reg(iout[FLED2]); + led->torch_iout_reg &= 0x0f; + } + + led->torch_iout_reg |= (iout1_reg | iout2_reg << + MAX77693_TORCH_IOUT_BITS); + + return regmap_write(rmap, MAX77693_LED_REG_ITORCH, + led->torch_iout_reg); +} + +static int max77693_set_flash_current(struct max77693_led *led, + int led_id, + u32 micro_amp) +{ + struct max77693_led_platform_data *p = led->pdata; + struct regmap *rmap = led->regmap; + u32 iout[2], iout_max[2]; + u8 iout1_reg, iout2_reg; + int ret = -EINVAL; + + iout_max[FLED1] = p->iout_flash[FLED1]; + iout_max[FLED2] = p->iout_flash[FLED2]; + + if (led_id == FLED1) { + /* + * Preclude splitting current to FLED2 if we + * are driving two separate leds. + */ + if (!led->iout_joint) + iout_max[FLED2] = 0; + max77693_calc_iout(iout, micro_amp, iout_max); + } else if (led_id == FLED2) { + iout_max[FLED1] = 0; + max77693_calc_iout(iout, micro_amp, iout_max); + } + + if (led_id == FLED1 || led->iout_joint) { + iout1_reg = max77693_led_iout_to_reg(iout[FLED1]); + ret = regmap_write(rmap, MAX77693_LED_REG_IFLASH1, + iout1_reg); + if (ret < 0) + return ret; + } + if (led_id == FLED2 || led->iout_joint) { + iout2_reg = max77693_led_iout_to_reg(iout[FLED2]); + ret = regmap_write(rmap, MAX77693_LED_REG_IFLASH2, + iout2_reg); + } + + return ret; +} + +static int max77693_set_timeout(struct max77693_led *led, u32 timeout) +{ + struct max77693_led_platform_data *p = led->pdata; + struct regmap *rmap = led->regmap; + u8 v; + int ret; + + v = max77693_flash_timeout_to_reg(timeout); + + if (p->trigger_type[FLASH] == MAX77693_LED_TRIG_TYPE_LEVEL) + v |= MAX77693_FLASH_TIMER_LEVEL; + + ret = regmap_write(rmap, MAX77693_LED_REG_FLASH_TIMER, v); + if (ret < 0) + return ret; + + led->current_flash_timeout = timeout; + + return 0; +} + +static int max77693_strobe_status_get(struct max77693_led *led, bool *state) +{ + struct regmap *rmap = led->regmap; + unsigned int v; + int ret; + + ret = regmap_read(rmap, MAX77693_LED_REG_FLASH_INT_STATUS, &v); + if (ret < 0) + return ret; + + *state = v & MAX77693_LED_STATUS_FLASH_ON; + + return ret; +} + +static int max77693_int_flag_get(struct max77693_led *led, unsigned int *v) +{ + struct regmap *rmap = led->regmap; + + return regmap_read(rmap, MAX77693_LED_REG_FLASH_INT, v); +} + +static int max77693_setup(struct max77693_led *led) +{ + struct max77693_led_platform_data *p = led->pdata; + struct regmap *rmap = led->regmap; + int i, firstLed, lastLed, ret; + u32 max_flash_curr[2]; + u8 v; + + /* + * Initialize only flash current. Torch current doesn't + * require initialization as ITORCH register is written with + * new value each time brightness_set op is called. + */ + if (led->iout_joint) { + firstLed = FLED1; + lastLed = FLED1; + max_flash_curr[FLED1] = p->iout_flash[FLED1] + + p->iout_flash[FLED2]; + } else { + firstLed = p->fleds[FLED1] ? FLED1 : FLED2; + lastLed = p->num_leds == 2 ? FLED2 : firstLed; + max_flash_curr[FLED1] = p->iout_flash[FLED1]; + max_flash_curr[FLED2] = p->iout_flash[FLED2]; + } + + for (i = firstLed; i <= lastLed; ++i) { + ret = max77693_set_flash_current(led, i, + max_flash_curr[i]); + if (ret < 0) + return ret; + } + + v = MAX77693_TORCH_NO_TIMER | MAX77693_LED_TRIG_TYPE_LEVEL; + ret = regmap_write(rmap, MAX77693_LED_REG_ITORCHTIMER, v); + if (ret < 0) + return ret; + + ret = max77693_set_timeout(led, p->flash_timeout); + if (ret < 0) + return ret; + + if (p->low_vsys > 0) + v = max77693_led_vsys_to_reg(p->low_vsys) | + MAX77693_FLASH_LOW_BATTERY_EN; + else + v = 0; + + ret = regmap_write(rmap, MAX77693_LED_REG_MAX_FLASH1, v); + if (ret < 0) + return ret; + ret = regmap_write(rmap, MAX77693_LED_REG_MAX_FLASH2, 0); + if (ret < 0) + return ret; + + if (p->boost_mode == MAX77693_LED_BOOST_FIXED) + v = MAX77693_FLASH_BOOST_FIXED; + else + v = p->boost_mode | p->boost_mode << 1; + if (p->fleds[FLED1] && p->fleds[FLED2]) + v |= MAX77693_FLASH_BOOST_LEDNUM_2; + ret = regmap_write(rmap, MAX77693_LED_REG_VOUT_CNTL, v); + if (ret < 0) + return ret; + + v = max77693_led_vout_to_reg(p->boost_vout); + ret = regmap_write(rmap, MAX77693_LED_REG_VOUT_FLASH1, v); + if (ret < 0) + return ret; + + return max77693_set_mode(led, MAX77693_MODE_OFF); +} + +static int max77693_led_brightness_set(struct max77693_led *led, + int led_id, enum led_brightness value) +{ + int ret; + + mutex_lock(&led->lock); + + if (value == 0) { + ret = max77693_clear_mode(led, MAX77693_MODE_TORCH1 << led_id); + if (ret < 0) + dev_dbg(&led->pdev->dev, + "Failed to clear torch mode (%d)\n", + ret); + goto unlock; + } + + ret = max77693_set_torch_current(led, led_id, value * + MAX77693_TORCH_IOUT_STEP); + if (ret < 0) { + dev_dbg(&led->pdev->dev, + "Failed to set torch current (%d)\n", + ret); + goto unlock; + } + + ret = max77693_add_mode(led, MAX77693_MODE_TORCH1 << led_id); + if (ret < 0) + dev_dbg(&led->pdev->dev, + "Failed to set torch mode (%d)\n", + ret); +unlock: + mutex_unlock(&led->lock); + return ret; +} + +#define MAX77693_LED_BRIGHTNESS_SET_WORK(ID) \ +static void max77693_led##ID##_brightness_set_work( \ + struct work_struct *work) \ +{ \ + struct max77693_led *led = container_of(work, \ + struct max77693_led, \ + work##ID##_brightness_set); \ + \ + max77693_led_brightness_set(led, FLED##ID, \ + led->torch##ID##_brightness); \ +} + +/* LED subsystem callbacks */ + +#define MAX77693_LED_TORCH_BRIGHTNESS_SET(ID) \ +static int max77693_led##ID##_torch_brightness_set( \ + struct led_classdev *led_cdev, \ + enum led_brightness value) \ +{ \ + struct led_classdev_flash *flash = lcdev_to_flash(led_cdev); \ + struct max77693_led *led = ldev##ID##_to_led(flash); \ + \ + return max77693_led_brightness_set(led, FLED##ID, value); \ +} + +#define MAX77693_LED_BRIGHTNESS_SET(ID) \ +static void max77693_led##ID##_brightness_set( \ + struct led_classdev *led_cdev, \ + enum led_brightness value) \ +{ \ + struct led_classdev_flash *flash = lcdev_to_flash(led_cdev); \ + struct max77693_led *led = ldev##ID##_to_led(flash); \ + \ + led->torch##ID##_brightness = value; \ + schedule_work(&led->work##ID##_brightness_set); \ +} + +#define MAX77693_LED_FLASH_BRIGHTNESS_SET(ID) \ +static int max77693_led##ID##_flash_brightness_set( \ + struct led_classdev_flash *flash, \ + u32 brightness) \ +{ \ + struct max77693_led *led = ldev##ID##_to_led(flash); \ + int ret; \ + \ + mutex_lock(&led->lock); \ + ret = max77693_set_flash_current(led, FLED##ID, brightness); \ + mutex_unlock(&led->lock); \ + \ + return ret; \ +} + +#define MAX77693_LED_FLASH_STROBE_SET(ID) \ +static int max77693_led##ID##_flash_strobe_set( \ + struct led_classdev_flash *flash, \ + bool state) \ +{ \ + struct max77693_led *led = ldev##ID##_to_led(flash); \ + int ret; \ + \ + mutex_lock(&led->lock); \ + \ + if (!state) { \ + ret = max77693_clear_mode(led, \ + MAX77693_MODE_FLASH##ID); \ + goto unlock; \ + } \ + \ + if (led->flash##ID##_timeout != led->current_flash_timeout) { \ + ret = max77693_set_timeout(led, \ + led->flash##ID##_timeout); \ + if (ret < 0) \ + goto unlock; \ + } \ + \ + ret = max77693_add_mode(led, MAX77693_MODE_FLASH##ID); \ + \ +unlock: \ + mutex_unlock(&led->lock); \ + return ret; \ +} + +#define MAX77693_LED_FLASH_EXTERNAL_STROBE_SET(ID) \ +static int max77693_led##ID##_external_strobe_set( \ + struct led_classdev_flash *flash, \ + bool enable) \ +{ \ + struct max77693_led *led = ldev##ID##_to_led(flash); \ + int ret; \ + \ + mutex_lock(&led->lock); \ + \ + if (enable) \ + ret = max77693_add_mode(led, \ + MAX77693_MODE_FLASH_EXTERNAL##ID); \ + else \ + ret = max77693_clear_mode(led, \ + MAX77693_MODE_FLASH_EXTERNAL##ID); \ + \ + mutex_unlock(&led->lock); \ + \ + return ret; \ +} + +#define MAX77693_LED_FLASH_FAULT_GET(ID) \ +static int max77693_led##ID##_flash_fault_get( \ + struct led_classdev_flash *flash, \ + u32 *fault) \ +{ \ + struct max77693_led *led = ldev##ID##_to_led(flash); \ + unsigned int v; \ + int ret; \ + \ + ret = max77693_int_flag_get(led, &v); \ + if (ret < 0) \ + return ret; \ + \ + *fault = 0; \ + \ + if (v & MAX77693_LED_FLASH_INT_FLED##ID##_OPEN) \ + *fault |= LED_FAULT_OVER_VOLTAGE; \ + if (v & MAX77693_LED_FLASH_INT_FLED##ID##_SHORT) \ + *fault |= LED_FAULT_SHORT_CIRCUIT; \ + if (v & MAX77693_LED_FLASH_INT_OVER_CURRENT) \ + *fault |= LED_FAULT_OVER_CURRENT; \ + \ + return 0; \ +} + +#define MAX77693_LED_FLASH_STROBE_GET(ID) \ +static int max77693_led##ID##_flash_strobe_get( \ + struct led_classdev_flash *flash, \ + bool *state) \ +{ \ + struct max77693_led *led = ldev##ID##_to_led(flash); \ + \ + if (!state) \ + return -EINVAL; \ + \ + return max77693_strobe_status_get(led, state); \ +} + +#define MAX77693_LED_FLASH_TIMEOUT_SET(ID) \ +static int max77693_led##ID##_flash_timeout_set( \ + struct led_classdev_flash *flash, \ + u32 timeout) \ +{ \ + struct max77693_led *led = ldev##ID##_to_led(flash); \ + \ + mutex_lock(&led->lock); \ + led->flash##ID##_timeout = timeout; \ + mutex_unlock(&led->lock); \ + \ + return 0; \ +} + +MAX77693_LED_BRIGHTNESS_SET(1) +MAX77693_LED_BRIGHTNESS_SET_WORK(1) +MAX77693_LED_TORCH_BRIGHTNESS_SET(1) +MAX77693_LED_FLASH_BRIGHTNESS_SET(1) +MAX77693_LED_FLASH_STROBE_SET(1) +MAX77693_LED_FLASH_STROBE_GET(1) +MAX77693_LED_FLASH_EXTERNAL_STROBE_SET(1) +MAX77693_LED_FLASH_TIMEOUT_SET(1) +MAX77693_LED_FLASH_FAULT_GET(1) + +MAX77693_LED_BRIGHTNESS_SET(2) +MAX77693_LED_BRIGHTNESS_SET_WORK(2) +MAX77693_LED_TORCH_BRIGHTNESS_SET(2) +MAX77693_LED_FLASH_BRIGHTNESS_SET(2) +MAX77693_LED_FLASH_STROBE_SET(2) +MAX77693_LED_FLASH_STROBE_GET(2) +MAX77693_LED_FLASH_EXTERNAL_STROBE_SET(2) +MAX77693_LED_FLASH_TIMEOUT_SET(2) +MAX77693_LED_FLASH_FAULT_GET(2) + +static void max77693_led_parse_dt(struct max77693_led_platform_data *p, + struct device_node *node) +{ + of_property_read_u32_array(node, "iout-torch", p->iout_torch, 2); + of_property_read_u32_array(node, "iout-flash", p->iout_flash, 2); + of_property_read_u32_array(node, "maxim,fleds", p->fleds, 2); + of_property_read_u32_array(node, "maxim,trigger", p->trigger, 2); + of_property_read_u32_array(node, "maxim,trigger-type", p->trigger_type, + 2); + of_property_read_u32(node, "flash-timeout", &p->flash_timeout); + of_property_read_u32(node, "maxim,boost-mode", &p->boost_mode); + of_property_read_u32(node, "maxim,boost-vout", &p->boost_vout); + of_property_read_u32(node, "maxim,num-leds", &p->num_leds); + of_property_read_u32(node, "maxim,vsys-min", &p->low_vsys); +} + +static void clamp_align(u32 *v, u32 min, u32 max, u32 step) +{ + *v = clamp_val(*v, min, max); + if (step > 1) + *v = (*v - min) / step * step + min; +} + +static void max77693_led_validate_platform_data( + struct max77693_led_platform_data *p) +{ + u32 max; + int i; + + p->boost_mode = clamp_val(p->boost_mode, MAX77693_LED_BOOST_NONE, + MAX77693_LED_BOOST_FIXED); + p->num_leds = clamp_val(p->num_leds, 1, 2); + + for (i = 0; i < ARRAY_SIZE(p->fleds); ++i) + p->fleds[i] = clamp_val(p->fleds[i], 0, 1); + + /* Ensure fleds configuration is sane */ + if (!p->fleds[FLED1] && !p->fleds[FLED2]) { + p->fleds[FLED1] = p->fleds[FLED2] = 1; + p->num_leds = 1; + } + + /* Ensure num_leds is consistent with fleds configuration */ + if ((!p->fleds[FLED1] || !p->fleds[FLED2]) && p->num_leds == 2) + p->num_leds = 1; + + /* + * boost must be enabled if current outputs + * are connected to separate leds. + */ + if ((p->num_leds == 2 || (p->fleds[FLED1] && p->fleds[FLED2])) && + p->boost_mode == MAX77693_LED_BOOST_NONE) + p->boost_mode = MAX77693_LED_BOOST_FIXED; + + max = p->boost_mode ? MAX77693_FLASH_IOUT_MAX_2LEDS : + MAX77693_FLASH_IOUT_MAX_1LED; + + if (p->fleds[FLED1]) { + clamp_align(&p->iout_torch[FLED1], MAX77693_TORCH_IOUT_MIN, + MAX77693_TORCH_IOUT_MAX, MAX77693_TORCH_IOUT_STEP); + clamp_align(&p->iout_flash[FLED1], MAX77693_FLASH_IOUT_MIN, + max, MAX77693_FLASH_IOUT_STEP); + } else { + p->iout_torch[FLED1] = p->iout_flash[FLED1] = 0; + } + if (p->fleds[FLED2]) { + clamp_align(&p->iout_torch[FLED2], MAX77693_TORCH_IOUT_MIN, + MAX77693_TORCH_IOUT_MAX, MAX77693_TORCH_IOUT_STEP); + clamp_align(&p->iout_flash[FLED2], MAX77693_FLASH_IOUT_MIN, + max, MAX77693_FLASH_IOUT_STEP); + } else { + p->iout_torch[FLED2] = p->iout_flash[FLED2] = 0; + } + + for (i = 0; i < ARRAY_SIZE(p->trigger); ++i) + p->trigger[i] = clamp_val(p->trigger[i], 0, 7); + for (i = 0; i < ARRAY_SIZE(p->trigger_type); ++i) + p->trigger_type[i] = clamp_val(p->trigger_type[i], + MAX77693_LED_TRIG_TYPE_EDGE, + MAX77693_LED_TRIG_TYPE_LEVEL); + + clamp_align(&p->flash_timeout, MAX77693_FLASH_TIMEOUT_MIN, + MAX77693_FLASH_TIMEOUT_MAX, MAX77693_FLASH_TIMEOUT_STEP); + + clamp_align(&p->boost_vout, MAX77693_FLASH_VOUT_MIN, + MAX77693_FLASH_VOUT_MAX, MAX77693_FLASH_VOUT_STEP); + + if (p->low_vsys) + clamp_align(&p->low_vsys, MAX77693_FLASH_VSYS_MIN, + MAX77693_FLASH_VSYS_MAX, MAX77693_FLASH_VSYS_STEP); +} + +static int max77693_led_get_platform_data(struct max77693_led *led) +{ + struct max77693_led_platform_data *p; + struct device *dev = &led->pdev->dev; + + if (dev->of_node) { + p = devm_kzalloc(dev, sizeof(*led->pdata), GFP_KERNEL); + if (!p) + return -ENOMEM; + max77693_led_parse_dt(p, dev->of_node); + } else { + p = dev_get_platdata(dev); + if (!p) + return -ENODEV; + } + led->pdata = p; + + max77693_led_validate_platform_data(p); + + return 0; +} + +#define MAX77693_LED_INIT_FLASH_OPS(ID) \ +const struct led_flash_ops flash_ops##ID = { \ + \ + .flash_brightness_set = max77693_led##ID##_flash_brightness_set, \ + .strobe_set = max77693_led##ID##_flash_strobe_set, \ + .strobe_get = max77693_led##ID##_flash_strobe_get, \ + .timeout_set = max77693_led##ID##_flash_timeout_set, \ + .external_strobe_set = max77693_led##ID##_external_strobe_set, \ + .fault_get = max77693_led##ID##_flash_fault_get, \ +}; + +MAX77693_LED_INIT_FLASH_OPS(1) +MAX77693_LED_INIT_FLASH_OPS(2) + +static void max77693_init_flash_settings(struct max77693_led *led, + struct max77693_led_settings *s, + int led_id) +{ + struct max77693_led_platform_data *p = led->pdata; + struct led_flash_setting *setting; + + /* Init torch intensity setting */ + setting = &s->torch_brightness; + setting->min = led->iout_joint ? + MAX77693_TORCH_IOUT_MIN * 2 : + MAX77693_TORCH_IOUT_MIN; + setting->max = led->iout_joint ? + p->iout_torch[FLED1] + p->iout_torch[FLED2] : + p->iout_torch[led_id]; + setting->step = MAX77693_TORCH_IOUT_STEP; + setting->val = setting->max; + + /* Init flash intensity setting */ + setting = &s->flash_brightness; + setting->min = led->iout_joint ? + MAX77693_FLASH_IOUT_MIN * 2 : + MAX77693_FLASH_IOUT_MIN; + setting->max = led->iout_joint ? + p->iout_flash[FLED1] + p->iout_flash[FLED2] : + p->iout_flash[led_id]; + setting->step = MAX77693_FLASH_IOUT_STEP; + setting->val = setting->max; + + /* Init flash timeout setting */ + setting = &s->flash_timeout; + setting->min = MAX77693_FLASH_TIMEOUT_MIN; + setting->max = MAX77693_FLASH_TIMEOUT_MAX; + setting->step = MAX77693_FLASH_TIMEOUT_STEP; + setting->val = p->flash_timeout; +} + +#ifdef CONFIG_V4L2_FLASH_LED_CLASS +static void max77693_init_v4l2_ctrl_config(struct max77693_led_settings *s, + struct v4l2_flash_ctrl_config *config) +{ + struct led_flash_setting *setting; + struct v4l2_ctrl_config *c; + + c = &config->torch_intensity; + setting = &s->torch_brightness; + c->min = setting->min; + c->max = setting->max; + c->step = setting->step; + c->def = setting->val; + + c = &config->flash_intensity; + setting = &s->flash_brightness; + c->min = setting->min; + c->max = setting->max; + c->step = setting->step; + c->def = setting->val; + + c = &config->flash_timeout; + setting = &s->flash_timeout; + c->min = setting->min; + c->max = setting->max; + c->step = setting->step; + c->def = setting->val; + + /* Init flash faults config */ + config->flash_faults = V4L2_FLASH_FAULT_OVER_VOLTAGE | + V4L2_FLASH_FAULT_SHORT_CIRCUIT | + V4L2_FLASH_FAULT_OVER_CURRENT; +} +#else +#define max77693_init_v4l2_ctrl_config(s, config) +#endif + +#define MAX77693_LED_REGISTER_FLASH(ID) \ +static int max77693_register_led##ID(struct max77693_led *led) \ +{ \ + struct platform_device *pdev = led->pdev; \ + struct device *dev = &pdev->dev; \ + struct led_classdev_flash *flash; \ + struct led_classdev *led_cdev; \ + struct max77693_led_platform_data *p = led->pdata; \ + struct v4l2_flash_ctrl_config v4l2_flash_config; \ + struct max77693_led_settings settings; \ + int ret; \ + \ + flash = &led->ldev##ID; \ + \ + /* Init flash settings */ \ + max77693_init_flash_settings(led, &settings, FLED##ID); \ + /* Init V4L2 Flash controls basing on initialized settings */ \ + max77693_init_v4l2_ctrl_config(&settings, &v4l2_flash_config); \ + \ + /* Init led class */ \ + led_cdev = &flash->led_cdev; \ + led_cdev->name = MAX77693_LED_NAME_##ID; \ + led_cdev->brightness_set = max77693_led##ID##_brightness_set; \ + led_cdev->torch_brightness_set = \ + max77693_led##ID##_torch_brightness_set; \ + led_cdev->max_brightness = settings.torch_brightness.val / \ + MAX77693_TORCH_IOUT_STEP; \ + led_cdev->flags |= LED_DEV_CAP_FLASH; \ + \ + INIT_WORK(&led->work##ID##_brightness_set, \ + max77693_led##ID##_brightness_set_work); \ + \ + flash->ops = &flash_ops##ID; \ + flash->brightness = settings.flash_brightness; \ + flash->timeout = settings.flash_timeout; \ + led->flash##ID##_timeout = flash->timeout.val; \ + \ + if (p->trigger[FLED##ID] & MAX77693_LED_TRIG_FLASH) \ + flash->has_external_strobe = true; \ + \ + /* Register in the LED subsystem. */ \ + ret = led_classdev_flash_register(&pdev->dev, flash, \ + dev->of_node); \ + if (ret < 0) \ + return ret; \ + \ + ret = v4l2_flash_init(flash, \ + &v4l2_flash_config, \ + led_get_v4l2_flash_ops(), \ + &led->v4l2_flash##ID); \ + if (ret < 0) \ + goto err_v4l2_flash_init; \ + \ + return 0; \ + \ +err_v4l2_flash_init: \ + led_classdev_flash_unregister(flash); \ + \ + return ret; \ +} + +MAX77693_LED_REGISTER_FLASH(1) +MAX77693_LED_REGISTER_FLASH(2) + +static int max77693_led_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct max77693_dev *iodev = dev_get_drvdata(dev->parent); + struct max77693_led *led; + struct max77693_led_platform_data *p; + int ret; + + led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + led->pdev = pdev; + led->regmap = iodev->regmap; + platform_set_drvdata(pdev, led); + ret = max77693_led_get_platform_data(led); + if (ret < 0) + return -EINVAL; + + p = led->pdata; + mutex_init(&led->lock); + + if (p->num_leds == 1 && p->fleds[FLED1] && p->fleds[FLED2]) + led->iout_joint = true; + + ret = max77693_setup(led); + if (ret < 0) + return ret; + + if (led->iout_joint || p->fleds[FLED1]) { + ret = max77693_register_led1(led); + if (ret < 0) + goto err_register_led1; + } + + if (!led->iout_joint && p->fleds[FLED2]) { + ret = max77693_register_led2(led); + if (ret < 0) + goto err_register_led2; + } + + return 0; + +err_register_led2: + if (!p->fleds[FLED1]) + goto err_register_led1; + v4l2_flash_release(led->v4l2_flash1); + led_classdev_flash_unregister(&led->ldev1); +err_register_led1: + mutex_destroy(&led->lock); + + return ret; +} + +static int max77693_led_remove(struct platform_device *pdev) +{ + struct max77693_led *led = platform_get_drvdata(pdev); + struct max77693_led_platform_data *p = led->pdata; + + if (led->iout_joint || p->fleds[FLED1]) { + v4l2_flash_release(led->v4l2_flash1); + led_classdev_flash_unregister(&led->ldev1); + cancel_work_sync(&led->work1_brightness_set); + } + if (!led->iout_joint && p->fleds[FLED2]) { + v4l2_flash_release(led->v4l2_flash2); + led_classdev_flash_unregister(&led->ldev2); + cancel_work_sync(&led->work2_brightness_set); + } + mutex_destroy(&led->lock); + + return 0; +} + +static struct of_device_id max77693_led_dt_match[] = { + {.compatible = "maxim,max77693-flash"}, + {}, +}; + +static struct platform_driver max77693_led_driver = { + .probe = max77693_led_probe, + .remove = max77693_led_remove, + .driver = { + .name = "max77693-flash", + .owner = THIS_MODULE, + .of_match_table = max77693_led_dt_match, + }, +}; + +module_platform_driver(max77693_led_driver); + +MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>"); +MODULE_AUTHOR("Andrzej Hajda <a.hajda@xxxxxxxxxxx>"); +MODULE_DESCRIPTION("Maxim MAX77693 led flash driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/mfd/max77693.c b/drivers/mfd/max77693.c index 249c139..cf008f4 100644 --- a/drivers/mfd/max77693.c +++ b/drivers/mfd/max77693.c @@ -44,9 +44,12 @@ static const struct mfd_cell max77693_devs[] = { { .name = "max77693-pmic", }, { .name = "max77693-charger", }, - { .name = "max77693-flash", }, { .name = "max77693-muic", }, { .name = "max77693-haptic", }, + { + .name = "max77693-flash", + .of_compatible = "maxim,max77693-flash", + }, }; static const struct regmap_config max77693_regmap_config = { diff --git a/include/linux/mfd/max77693.h b/include/linux/mfd/max77693.h index 3f3dc45..f0b6585 100644 --- a/include/linux/mfd/max77693.h +++ b/include/linux/mfd/max77693.h @@ -63,6 +63,45 @@ struct max77693_muic_platform_data { int path_uart; }; +/* MAX77693 led flash */ + +/* triggers */ +enum max77693_led_trigger { + MAX77693_LED_TRIG_OFF, + MAX77693_LED_TRIG_FLASH, + MAX77693_LED_TRIG_TORCH, + MAX77693_LED_TRIG_EXT, + MAX77693_LED_TRIG_SOFT, +}; + +/* trigger types */ +enum max77693_led_trigger_type { + MAX77693_LED_TRIG_TYPE_EDGE, + MAX77693_LED_TRIG_TYPE_LEVEL, +}; + +/* boost modes */ +enum max77693_led_boost_mode { + MAX77693_LED_BOOST_NONE, + MAX77693_LED_BOOST_ADAPTIVE, + MAX77693_LED_BOOST_FIXED, +}; + +struct max77693_led_platform_data { + u32 fleds[2]; + u32 iout_torch[2]; + u32 iout_flash[2]; + u32 trigger[2]; + u32 trigger_type[2]; + u32 num_leds; + u32 boost_mode; + u32 flash_timeout; + u32 boost_vout; + u32 low_vsys; +}; + +/* MAX77693 */ + struct max77693_platform_data { /* regulator data */ struct max77693_regulator_data *regulators; @@ -70,5 +109,6 @@ struct max77693_platform_data { /* muic data */ struct max77693_muic_platform_data *muic_data; + struct max77693_led_platform_data *led_data; }; #endif /* __LINUX_MFD_MAX77693_H */ -- 1.7.9.5 -- 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