[PATCH/RFC v8 10/14] leds: Add support for max77693 mfd flash cell

Jacek Anaszewski
2014-11-28T09:20:43Z

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 sub-device when the support
for V4L2 Flash sub-devices is enabled. Device supports up to
two leds which can work in flash and torch mode. The leds can
be triggered externally or by software.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Bryan Wu <cooloney@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: SangYoung Son <hello.son@smasung.com>
Cc: Samuel Ortiz <sameo@linux.intel.com>
---
drivers/leds/Kconfig | 10 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-max77693.c | 1152 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1163 insertions(+)
create mode 100644 drivers/leds/leds-max77693.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index fa8021e..2e66d55 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -463,6 +463,16 @@ 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
+ depends on OF
+ 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 cbba921..57ca62b 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -52,6 +52,7 @@ 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..2e96fd9
--- /dev/null
+++ b/drivers/leds/leds-max77693.c
@@ -0,0 +1,1152 @@
+/*
+ * LED Flash class driver for the flash cell of max77693 mfd.
+ *
+ * Copyright (C) 2014, Samsung Electronics Co., Ltd.
+ *
+ * Authors: Jacek Anaszewski <j.anaszewski@samsung.com>
+ * Andrzej Hajda <a.hajda@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 <asm/div64.h>
+#include <linux/led-class-flash.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 MODE_OFF 0
+#define MODE_FLASH1 (1 << 0)
+#define MODE_FLASH2 (1 << 1)
+#define MODE_TORCH1 (1 << 2)
+#define MODE_TORCH2 (1 << 3)
+#define MODE_FLASH_EXTERNAL1 (1 << 4)
+#define MODE_FLASH_EXTERNAL2 (1 << 5)
+
+#define MODE_FLASH (MODE_FLASH1 | MODE_FLASH2 | \
+ MODE_FLASH_EXTERNAL1 | MODE_FLASH_EXTERNAL2)
+
+#define FLED1_IOUT (1 << 0)
+#define FLED2_IOUT (1 << 1)
+
+enum {
+ FLED1,
+ FLED2
+};
+
+enum {
+ FLASH,
+ TORCH
+};
+
+struct max77693_sub_led {
+ struct led_classdev_flash ldev;
+ struct work_struct work_brightness_set;
+ struct v4l2_flash *v4l2_flash;
+
+ unsigned int torch_brightness;
+ unsigned int flash_timeout;
+};
+
+struct max77693_led {
+ struct regmap *regmap;
+ struct platform_device *pdev;
+ struct max77693_led_platform_data *pdata;
+ struct mutex lock;
+
+ struct max77693_sub_led sub_leds[2];
+
+ unsigned int current_flash_timeout;
+ unsigned int mode_flags;
+ u8 torch_iout_reg;
+ bool iout_joint;
+ int strobing_sub_led_id;
+};
+
+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 < FLASH_IOUT_MIN)
+ ua = FLASH_IOUT_MIN;
+ return (ua - FLASH_IOUT_MIN) / FLASH_IOUT_STEP;
+}
+
+static u8 max77693_flash_timeout_to_reg(u32 us)
+{
+ return (us - FLASH_TIMEOUT_MIN) / FLASH_TIMEOUT_STEP;
+}
+
+static inline struct max77693_led *ldev1_to_led(
+ struct led_classdev_flash *ldev)
+{
+ struct max77693_sub_led *sub_led = container_of(ldev,
+ struct max77693_sub_led,
+ ldev);
+ return container_of(sub_led, struct max77693_led, sub_leds[0]);
+}
+
+static inline struct max77693_led *ldev2_to_led(
+ struct led_classdev_flash *ldev)
+{
+ struct max77693_sub_led *sub_led = container_of(ldev,
+ struct max77693_sub_led,
+ ldev);
+ return container_of(sub_led, struct max77693_led, sub_leds[1]);
+}
+
+static u8 max77693_led_vsys_to_reg(u32 mv)
+{
+ return ((mv - MAX_FLASH1_VSYS_MIN) / MAX_FLASH1_VSYS_STEP) << 2;
+}
+
+static u8 max77693_led_vout_to_reg(u32 mv)
+{
+ return (mv - FLASH_VOUT_MIN) / FLASH_VOUT_STEP + 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 / FLASH_IOUT_STEP * 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 & MODE_TORCH1) {
+ if (p->trigger[FLED1] & MAX77693_LED_TRIG_SOFT)
+ v |= FLASH_EN_ON << TORCH_EN_SHIFT(1);
+ }
+
+ if (mode & MODE_TORCH2) {
+ if (p->trigger[FLED2] & MAX77693_LED_TRIG_SOFT)
+ v |= FLASH_EN_ON << TORCH_EN_SHIFT(2);
+ }
+
+ if (mode & MODE_FLASH1) {
+ if (p->trigger[FLED1] & MAX77693_LED_TRIG_SOFT)
+ v |= FLASH_EN_ON << FLASH_EN_SHIFT(1);
+ } else if (mode & MODE_FLASH_EXTERNAL1) {
+ if (p->trigger[FLED1] & MAX77693_LED_TRIG_EXT)
+ v |= FLASH_EN_FLASH << FLASH_EN_SHIFT(2);
+ /*
+ * 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 |= FLASH_EN_TORCH << TORCH_EN_SHIFT(1);
+ }
+
+ if (mode & MODE_FLASH2) {
+ if (p->trigger[FLED2] & MAX77693_LED_TRIG_SOFT)
+ v |= FLASH_EN_ON << FLASH_EN_SHIFT(2);
+ } else if (mode & MODE_FLASH_EXTERNAL2) {
+ if (p->trigger[FLED2] & MAX77693_LED_TRIG_EXT)
+ v |= FLASH_EN_FLASH << FLASH_EN_SHIFT(2);
+ /*
+ * 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 |= FLASH_EN_TORCH << TORCH_EN_SHIFT(2);
+ }
+
+ /* Reset the register only prior setting flash modes */
+ if (mode & ~(MODE_TORCH1 | 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 void max77693_set_sync_strobe(struct max77693_led *led,
+ unsigned int *mode)
+{
+ struct max77693_sub_led *sub_leds = led->sub_leds;
+ struct led_classdev_flash *flash;
+ unsigned int m = *mode;
+
+ /*
+ * If there are two leds then check if the other one
+ * wants to be strobed simultaneously.
+ */
+ if (!led->iout_joint) {
+ if (m & (MODE_FLASH1 | MODE_FLASH_EXTERNAL1)) {
+ flash = &sub_leds[FLED2].ldev;
+ if (flash->sync_strobe)
+ m |= m << 1;
+ } else if (m & (MODE_FLASH2 | MODE_FLASH_EXTERNAL2)) {
+ flash = &sub_leds[FLED1].ldev;
+ if (flash->sync_strobe)
+ m |= m >> 1;
+ }
+ }
+
+ *mode = m;
+}
+
+static int max77693_add_mode(struct max77693_led *led, unsigned int mode)
+{
+ int ret;
+
+ /* Span the 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 & MODE_TORCH1) &&
+ (led->mode_flags & MODE_TORCH1))
+ return 0;
+ if ((mode & MODE_TORCH2) &&
+ (led->mode_flags & MODE_TORCH2))
+ return 0;
+
+ /* Span a flash mode on the other led if it is to be synchronized */
+ max77693_set_sync_strobe(led, &mode);
+
+ /*
+ * FLASH_EXTERNAL mode activates FLASHEN and TORCHEN pins
+ * in the device. The related register settings interfere
+ * with SW triggerred modes, thus clear them to ensure proper
+ * device configuration.
+ */
+ if (mode & MODE_FLASH_EXTERNAL1)
+ led->mode_flags &= (~MODE_TORCH1 & ~MODE_FLASH1);
+ if (mode & MODE_FLASH_EXTERNAL2)
+ led->mode_flags &= (~MODE_TORCH2 & ~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
+ * spurious flash strobing on every subsequent torch mode
+ * setting.
+ */
+ if (mode & MODE_FLASH)
+ led->mode_flags &= ~mode;
+
+ return ret;
+}
+
+static int max77693_clear_mode(struct max77693_led *led, unsigned int mode)
+{
+ int ret;
+
+ if (led->iout_joint)
+ /* Clear mode also on FLED2 for joint iouts case */
+ mode |= (mode << 1);
+ else
+ /*
+ * Clear a flash mode on the other led
+ * if it is to be synchronized.
+ */
+ max77693_set_sync_strobe(led, &mode);
+
+ 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 << TORCH_IOUT1_SHIFT) |
+ (iout2_reg << TORCH_IOUT2_SHIFT));
+
+ 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 |= FLASH_TMR_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_STATUS, &v);
+ if (ret < 0)
+ return ret;
+
+ *state = v & FLASH_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, first_led, last_led, 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) {
+ first_led = FLED1;
+ last_led = FLED1;
+ max_flash_curr[FLED1] = p->iout_flash[FLED1] +
+ p->iout_flash[FLED2];
+ } else {
+ first_led = p->fleds[FLED1] ? FLED1 : FLED2;
+ last_led = p->num_leds == 2 ? FLED2 : first_led;
+ max_flash_curr[FLED1] = p->iout_flash[FLED1];
+ max_flash_curr[FLED2] = p->iout_flash[FLED2];
+ }
+
+ for (i = first_led; i <= last_led; ++i) {
+ ret = max77693_set_flash_current(led, i,
+ max_flash_curr[i]);
+ if (ret < 0)
+ return ret;
+ }
+
+ v = TORCH_TMR_NO_TIMER | MAX77693_LED_TRIG_TYPE_LEVEL;
+ ret = regmap_write(rmap, MAX77693_LED_REG_ITORCHTIMER, v);
+ if (ret < 0)
+ return ret;
+
+ /* initially set FLED1 timeout */
+ ret = max77693_set_timeout(led, p->flash_timeout[FLED1]);
+ if (ret < 0)
+ return ret;
+
+ if (p->low_vsys > 0)
+ v = max77693_led_vsys_to_reg(p->low_vsys) |
+ MAX_FLASH1_MAX_FL_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 = FLASH_BOOST_FIXED;
+ else
+ v = p->boost_mode | p->boost_mode << 1;
+ if (p->fleds[FLED1] && p->fleds[FLED2])
+ v |= 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, 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, 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 * 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, 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_sub_led *sub_led = \
+ container_of(work, struct max77693_sub_led, \
+ work_brightness_set); \
+ struct max77693_led *led = container_of(sub_led, \
+ struct max77693_led, \
+ sub_leds[FLED##ID]); \
+ struct max77693_sub_led *sub_leds = led->sub_leds; \
+ \
+ max77693_led_brightness_set(led, FLED##ID, \
+ sub_leds[FLED##ID].torch_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); \
+ struct max77693_sub_led *sub_leds = led->sub_leds; \
+ \
+ sub_leds[FLED##ID].torch_brightness = value; \
+ schedule_work(&sub_leds[FLED##ID].work_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); \
+ struct max77693_sub_led *sub_leds = led->sub_leds; \
+ int ret; \
+ \
+ mutex_lock(&led->lock); \
+ \
+ if (!state) { \
+ ret = max77693_clear_mode(led, MODE_FLASH##ID); \
+ goto unlock; \
+ } \
+ \
+ if (sub_leds[FLED##ID].flash_timeout != \
+ led->current_flash_timeout) { \
+ ret = max77693_set_timeout(led, \
+ sub_leds[FLED##ID].flash_timeout); \
+ if (ret < 0) \
+ goto unlock; \
+ } \
+ \
+ led->strobing_sub_led_id = ID; \
+ \
+ ret = max77693_add_mode(led, MODE_FLASH##ID); \
+ \
+unlock: \
+ mutex_unlock(&led->lock); \
+ return ret; \
+}
+
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+#define MAX77693_LED_FLASH_EXTERNAL_STROBE_SET(ID) \
+static int max77693_led##ID##_external_strobe_set( \
+ struct v4l2_flash *v4l2_flash, \
+ bool enable) \
+{ \
+ struct max77693_led *led = \
+ ldev##ID##_to_led(v4l2_flash->flash); \
+ int ret; \
+ \
+ mutex_lock(&led->lock); \
+ \
+ if (enable) \
+ ret = max77693_add_mode(led, MODE_FLASH_EXTERNAL##ID); \
+ else \
+ ret = max77693_clear_mode(led, \
+ MODE_FLASH_EXTERNAL##ID); \
+ \
+ mutex_unlock(&led->lock); \
+ \
+ return ret; \
+}
+#else
+#define MAX77693_LED_FLASH_EXTERNAL_STROBE_SET(ID)
+#endif
+
+#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 & FLASH_INT_FLED##ID##_OPEN) \
+ *fault |= LED_FAULT_OVER_VOLTAGE; \
+ if (v & FLASH_INT_FLED##ID##_SHORT) \
+ *fault |= LED_FAULT_SHORT_CIRCUIT; \
+ if (v & 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); \
+ int ret; \
+ \
+ if (!state) \
+ return -EINVAL; \
+ \
+ mutex_lock(&led->lock); \
+ \
+ ret = max77693_strobe_status_get(led, state); \
+ \
+ *state = !!(*state && led->strobing_sub_led_id == ID); \
+ \
+ mutex_unlock(&led->lock); \
+ \
+ return ret; \
+}
+
+#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); \
+ struct max77693_sub_led *sub_leds = led->sub_leds; \
+ \
+ mutex_lock(&led->lock); \
+ sub_leds[FLED##ID].flash_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 int max77693_led_parse_dt(struct max77693_led *led,
+ struct device_node *node)
+{
+ struct max77693_led_platform_data *p = led->pdata;
+ struct device *dev = &led->pdev->dev;
+ struct device_node *child_node;
+ u32 fled_id;
+ int ret;
+
+ 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, "maxim,boost-mode", &p->boost_mode);
+ of_property_read_u32(node, "maxim,boost-vout", &p->boost_vout);
+ of_property_read_u32(node, "maxim,vsys-min", &p->low_vsys);
+
+ for_each_available_child_of_node(node, child_node) {
+ ret = of_property_read_u32(child_node, "maxim,fled_id",
+ &fled_id);
+ if (ret < 0) {
+ dev_err(dev, "Error reading \"fled_id\" DT property\n");
+ return ret;
+ }
+
+ fled_id = clamp_val(fled_id, 1, 2);
+ --fled_id;
+
+ ret = of_property_read_string(child_node, "label",
+ (const char **) &p->label[fled_id]);
+ if (ret < 0) {
+ dev_err(dev, "Error reading \"label\" DT property\n");
+ return ret;
+ }
+
+ of_property_read_u32(child_node, "max-microamp",
+ &p->iout_torch[fled_id]);
+ of_property_read_u32(child_node, "flash-max-microamp",
+ &p->iout_flash[fled_id]);
+ of_property_read_u32(child_node, "flash-timeout-microsec",
+ &p->flash_timeout[fled_id]);
+ if (++p->num_leds == 2)
+ break;
+ }
+
+ return 0;
+}
+
+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);
+
+ 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 ? FLASH_IOUT_MAX_2LEDS : FLASH_IOUT_MAX_1LED;
+
+ if (p->fleds[FLED1]) {
+ clamp_align(&p->iout_torch[FLED1], TORCH_IOUT_MIN,
+ TORCH_IOUT_MAX, TORCH_IOUT_STEP);
+ clamp_align(&p->iout_flash[FLED1], FLASH_IOUT_MIN, max,
+ FLASH_IOUT_STEP);
+ } else {
+ p->iout_torch[FLED1] = p->iout_flash[FLED1] = 0;
+ }
+ if (p->fleds[FLED2]) {
+ clamp_align(&p->iout_torch[FLED2], TORCH_IOUT_MIN,
+ TORCH_IOUT_MAX, TORCH_IOUT_STEP);
+ clamp_align(&p->iout_flash[FLED2], FLASH_IOUT_MIN, max,
+ 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);
+
+ for (i = 0; i < ARRAY_SIZE(p->flash_timeout); ++i)
+ clamp_align(&p->flash_timeout[i], FLASH_TIMEOUT_MIN,
+ FLASH_TIMEOUT_MAX, FLASH_TIMEOUT_STEP);
+
+ clamp_align(&p->boost_vout, FLASH_VOUT_MIN, FLASH_VOUT_MAX,
+ FLASH_VOUT_STEP);
+
+ if (p->low_vsys)
+ clamp_align(&p->low_vsys, MAX_FLASH1_VSYS_MIN,
+ MAX_FLASH1_VSYS_MAX, MAX_FLASH1_VSYS_STEP);
+}
+
+static int max77693_led_get_platform_data(struct max77693_led *led)
+{
+ struct device *dev = &led->pdev->dev;
+ int ret;
+
+ if (!dev->of_node)
+ return -EINVAL;
+
+ led->pdata = devm_kzalloc(dev, sizeof(*led->pdata), GFP_KERNEL);
+ if (!led->pdata)
+ return -ENOMEM;
+
+ ret = max77693_led_parse_dt(led, dev->of_node);
+ if (ret < 0)
+ return ret;
+
+ max77693_led_validate_platform_data(led->pdata);
+
+ return 0;
+}
+
+#define MAX77693_LED_INIT_FLASH_OPS(ID) \
+static 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, \
+ .fault_get = max77693_led##ID##_flash_fault_get, \
+}
+
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+#define MAX77693_LED_V4L2_FLASH_OPS(ID) \
+static const struct v4l2_flash_ops v4l2_flash##ID##_ops = { \
+ .external_strobe_set = max77693_led##ID##_external_strobe_set, \
+}
+
+#define MAX77693_LED_GET_V4L2_FLASH_OPS(ID) \
+static inline const struct v4l2_flash_ops *get_v4l2_flash##ID##_ops(void) \
+{ \
+ return &v4l2_flash##ID##_ops; \
+}
+#else
+#define MAX77693_LED_V4L2_FLASH_OPS(ID)
+
+#define MAX77693_LED_GET_V4L2_FLASH_OPS(ID) \
+static inline const struct v4l2_flash_ops *get_v4l2_flash##ID##_ops(void) \
+{ \
+ return NULL; \
+}
+#endif
+
+MAX77693_LED_INIT_FLASH_OPS(1);
+MAX77693_LED_INIT_FLASH_OPS(2);
+
+MAX77693_LED_V4L2_FLASH_OPS(1);
+MAX77693_LED_V4L2_FLASH_OPS(2);
+MAX77693_LED_GET_V4L2_FLASH_OPS(1);
+MAX77693_LED_GET_V4L2_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 ? TORCH_IOUT_MIN * 2 :
+ TORCH_IOUT_MIN;
+ setting->max = led->iout_joint ?
+ p->iout_torch[FLED1] + p->iout_torch[FLED2] :
+ p->iout_torch[led_id];
+ setting->step = TORCH_IOUT_STEP;
+ setting->val = setting->max;
+
+ /* Init flash intensity setting */
+ setting = &s->flash_brightness;
+ setting->min = led->iout_joint ? FLASH_IOUT_MIN * 2 :
+ FLASH_IOUT_MIN;
+ setting->max = led->iout_joint ?
+ p->iout_flash[FLED1] + p->iout_flash[FLED2] :
+ p->iout_flash[led_id];
+ setting->step = FLASH_IOUT_STEP;
+ setting->val = setting->max;
+
+ /* Init flash timeout setting */
+ setting = &s->flash_timeout;
+ setting->min = FLASH_TIMEOUT_MIN;
+ setting->max = p->flash_timeout[led_id];
+ setting->step = FLASH_TIMEOUT_STEP;
+ setting->val = setting->max;
+}
+
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+static void max77693_init_v4l2_ctrl_config(struct max77693_led_settings *s,
+ struct max77693_led_platform_data *p,
+ struct v4l2_flash_ctrl_config *config,
+ int led_id)
+{
+ 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;
+
+ config->has_external_strobe =
+ !!(p->trigger[led_id] & MAX77693_LED_TRIG_FLASH);
+}
+#else
+#define max77693_init_v4l2_ctrl_config(s, p, config, led_id)
+#endif
+
+static int max77693_register_led(struct max77693_led *led, int id)
+{
+ struct platform_device *pdev = led->pdev;
+ struct led_classdev_flash *flash;
+ struct led_classdev *led_cdev;
+ struct max77693_sub_led *sub_leds = led->sub_leds;
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+ struct v4l2_flash_ctrl_config v4l2_flash_config;
+#endif
+ const struct v4l2_flash_ops *v4l2_flash_ops = NULL;
+ struct max77693_led_settings settings;
+ int ret;
+
+ flash = &sub_leds[id].ldev;
+
+ /* Init flash settings */
+ max77693_init_flash_settings(led, &settings, id);
+ /* Init V4L2 Flash controls basing on initialized settings */
+ max77693_init_v4l2_ctrl_config(&settings, led->pdata,
+ &v4l2_flash_config, id);
+
+ /* Init led class */
+ led_cdev = &flash->led_cdev;
+
+ if (id == FLED1) {
+ led_cdev->name = led->pdata->label[FLED1];
+ led_cdev->brightness_set = max77693_led1_brightness_set;
+ led_cdev->brightness_set_sync =
+ max77693_led1_torch_brightness_set;
+ INIT_WORK(&sub_leds[id].work_brightness_set,
+ max77693_led1_brightness_set_work);
+ flash->ops = &flash_ops1;
+ v4l2_flash_ops = get_v4l2_flash1_ops();
+
+ } else {
+ led_cdev->name = led->pdata->label[FLED2];
+ led_cdev->brightness_set = max77693_led2_brightness_set;
+ led_cdev->brightness_set_sync =
+ max77693_led2_torch_brightness_set;
+ INIT_WORK(&sub_leds[id].work_brightness_set,
+ max77693_led2_brightness_set_work);
+ flash->ops = &flash_ops2;
+ v4l2_flash_ops = get_v4l2_flash2_ops();
+ }
+
+ led_cdev->max_brightness = settings.torch_brightness.val /
+ TORCH_IOUT_STEP;
+ led_cdev->flags |= LED_DEV_CAP_FLASH;
+ if (led->pdata->num_leds == 2)
+ led_cdev->flags |= LED_DEV_CAP_COMPOUND;
+
+ flash->brightness = settings.flash_brightness;
+ flash->timeout = settings.flash_timeout;
+ sub_leds[id].flash_timeout = flash->timeout.val;
+
+ /* Register in the LED subsystem. */
+ ret = led_classdev_flash_register(&pdev->dev, flash);
+ if (ret < 0)
+ return ret;
+
+ sub_leds[id].v4l2_flash =
+ v4l2_flash_init(flash,
+ v4l2_flash_ops,
+ &v4l2_flash_config);
+
+ if (IS_ERR(sub_leds[id].v4l2_flash)) {
+ ret = PTR_ERR(sub_leds[id].v4l2_flash);
+ goto err_v4l2_flash_init;
+ }
+
+ return 0;
+
+err_v4l2_flash_init:
+ led_classdev_flash_unregister(flash);
+
+ return ret;
+}
+
+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;
+ struct max77693_sub_led *sub_leds;
+ int ret;
+
+ led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ led->pdev = pdev;
+ led->regmap = iodev->regmap;
+ sub_leds = led->sub_leds;
+ 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)
+ goto err_setup;
+
+ if (led->iout_joint || p->fleds[FLED1]) {
+ ret = max77693_register_led(led, FLED1);
+ if (ret < 0)
+ goto err_setup;
+ }
+
+ if (!led->iout_joint && p->fleds[FLED2]) {
+ ret = max77693_register_led(led, FLED2);
+ if (ret < 0)
+ goto err_register_led2;
+ }
+
+ return 0;
+
+err_register_led2:
+ if (!p->fleds[FLED1])
+ goto err_setup;
+ v4l2_flash_release(sub_leds[FLED1].v4l2_flash);
+ led_classdev_flash_unregister(&sub_leds[FLED1].ldev);
+err_setup:
+ 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;
+ struct max77693_sub_led *sub_leds = led->sub_leds;
+
+ if (led->iout_joint || p->fleds[FLED1]) {
+ v4l2_flash_release(sub_leds[FLED1].v4l2_flash);
+ led_classdev_flash_unregister(&sub_leds[FLED1].ldev);
+ cancel_work_sync(&sub_leds[FLED1].work_brightness_set);
+ }
+
+ if (!led->iout_joint && p->fleds[FLED2]) {
+ v4l2_flash_release(sub_leds[FLED2].v4l2_flash);
+ led_classdev_flash_unregister(&sub_leds[FLED2].ldev);
+ cancel_work_sync(&sub_leds[FLED2].work_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@samsung.com>");
+MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
+MODULE_DESCRIPTION("Maxim MAX77693 led flash driver");
+MODULE_LICENSE("GPL");
--
1.7.9.5