--- /dev/null
+/*
+ * LED Flash class driver for the flash cell of max77693 mfd.
+ *
+ * Copyright (C) 2015, 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 <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>
+
+#define MODE_OFF 0
+#define MODE_FLASH(a) (1 << (a))
+#define MODE_TORCH(a) (1 << (2 + (a)))
+#define MODE_FLASH_EXTERNAL(a) (1 << (4 + (a)))
+
+#define MODE_FLASH_MASK (MODE_FLASH(FLED1) | MODE_FLASH(FLED2) | \
+ MODE_FLASH_EXTERNAL(FLED1) | \
+ MODE_FLASH_EXTERNAL(FLED2))
+#define MODE_TORCH_MASK (MODE_TORCH(FLED1) | MODE_TORCH(FLED2))
+
+#define FLED1_IOUT (1 << 0)
+#define FLED2_IOUT (1 << 1)
+
+enum max77693_fled {
+ FLED1,
+ FLED2,
+};
+
+enum max77693_led_mode {
+ FLASH,
+ TORCH,
+};
+
+struct max77693_led_config_data {
+ const char *label[2];
+ u32 iout_torch_max[2];
+ u32 iout_flash_max[2];
+ u32 flash_timeout_max[2];
+ u32 num_leds;
+ u32 boost_mode;
+ u32 boost_vout;
+ u32 low_vsys;
+};
+
+struct max77693_sub_led {
+ /* corresponding FLED output identifier */
+ int fled_id;
+ /* corresponding LED Flash class device */
+ struct led_classdev_flash fled_cdev;
+ /* assures led-triggers compatibility */
+ struct work_struct work_brightness_set;
+
+ /* brightness cache */
+ unsigned int torch_brightness;
+ /* flash timeout cache */
+ unsigned int flash_timeout;
+ /* flash faults that may have occurred */
+ u32 flash_faults;
+};
+
+struct max77693_led_device {
+ /* parent mfd regmap */
+ struct regmap *regmap;
+ /* platform device data */
+ struct platform_device *pdev;
+ /* secures access to the device */
+ struct mutex lock;
+
+ /* sub led data */
+ struct max77693_sub_led sub_leds[2];
+
+ /* maximum torch current values for FLED outputs */
+ u32 iout_torch_max[2];
+ /* maximum flash current values for FLED outputs */
+ u32 iout_flash_max[2];
+
+ /* current flash timeout cache */
+ unsigned int current_flash_timeout;
+ /* ITORCH register cache */
+ u8 torch_iout_reg;
+ /* mode of fled outputs */
+ unsigned int mode_flags;
+ /* recently strobed fled */
+ int strobing_sub_led_id;
+ /* bitmask of FLED outputs use state (bit 0. - FLED1, bit 1. - FLED2) */
+ u8 fled_mask;
+ /* FLED modes that can be set */
+ u8 allowed_modes;
+
+ /* arrangement of current outputs */
+ bool iout_joint;
+};
+
+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_sub_led *flcdev_to_sub_led(
+ struct led_classdev_flash *fled_cdev)
+{
+ return container_of(fled_cdev, struct max77693_sub_led, fled_cdev);
+}
+
+static inline struct max77693_led_device *sub_led_to_led(
+ struct max77693_sub_led *sub_led)
+{
+ return container_of(sub_led, struct max77693_led_device,
+ sub_leds[sub_led->fled_id]);
+}
+
+static inline u8 max77693_led_vsys_to_reg(u32 mv)
+{
+ return ((mv - MAX_FLASH1_VSYS_MIN) / MAX_FLASH1_VSYS_STEP) << 2;
+}
+
+static inline u8 max77693_led_vout_to_reg(u32 mv)
+{
+ return (mv - FLASH_VOUT_MIN) / FLASH_VOUT_STEP + FLASH_VOUT_RMIN;
+}
+
+static inline bool max77693_fled_used(struct max77693_led_device *led,
+ int fled_id)
+{
+ u8 fled_bit = (fled_id == FLED1) ? FLED1_IOUT : FLED2_IOUT;
+
+ return led->fled_mask & fled_bit;
+}
+
+static int max77693_set_mode_reg(struct max77693_led_device *led, u8 mode)
+{
+ struct regmap *rmap = led->regmap;
+ int ret, v = 0, i;
+
+ for (i = FLED1; i <= FLED2; ++i) {
+ if (mode & MODE_TORCH(i))
+ v |= FLASH_EN_ON << TORCH_EN_SHIFT(i);
+
+ if (mode & MODE_FLASH(i)) {
+ v |= FLASH_EN_ON << FLASH_EN_SHIFT(i);
+ } else if (mode & MODE_FLASH_EXTERNAL(i)) {
+ v |= FLASH_EN_FLASH << FLASH_EN_SHIFT(i);
+ /*
+ * Enable hw triggering also for torch mode, as some
+ * camera sensors use torch led to fathom ambient light
+ * conditions before strobing the flash.
+ */
+ v |= FLASH_EN_TORCH << TORCH_EN_SHIFT(i);
+ }
+ }
+
+ /* Reset the register only prior setting flash modes */
+ if (mode & ~(MODE_TORCH(FLED1) | MODE_TORCH(FLED2))) {
+ 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_device *led, u8 mode)
+{
+ u8 new_mode_flags;
+ int i, ret;
+
+ if (led->iout_joint)
+ /* Span the mode on FLED2 for joint iouts case */
+ mode |= (mode << 1);
+
+ /*
+ * FLASH_EXTERNAL mode activates FLASHEN and TORCHEN pins in the device.
+ * Corresponding register bit fields interfere with SW triggered modes,
+ * thus clear them to ensure proper device configuration.
+ */
+ for (i = FLED1; i <= FLED2; ++i)
+ if (mode & MODE_FLASH_EXTERNAL(i))
+ led->mode_flags &= (~MODE_TORCH(i) & ~MODE_FLASH(i));
+
+ new_mode_flags = mode | led->mode_flags;
+ new_mode_flags &= led->allowed_modes;
+
+ if (new_mode_flags ^ led->mode_flags)
+ led->mode_flags = new_mode_flags;
+ else
+ return 0;
+
+ ret = max77693_set_mode_reg(led, led->mode_flags);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Clear flash mode flag after setting the mode to avoid spurious flash
+ * strobing on each subsequent torch mode setting.
+ */
+ if (mode & MODE_FLASH_MASK)
+ led->mode_flags &= ~mode;
+
+ return ret;
+}
+
+static int max77693_clear_mode(struct max77693_led_device *led,
+ u8 mode)
+{
+ if (led->iout_joint)
+ /* Clear mode also on FLED2 for joint iouts case */
+ mode |= (mode << 1);
+
+ led->mode_flags &= ~mode;
+
+ return max77693_set_mode_reg(led, led->mode_flags);
+}
+
+static void max77693_add_allowed_modes(struct max77693_led_device *led,
+ int fled_id, enum max77693_led_mode mode)
+{
+ if (mode == FLASH)
+ led->allowed_modes |= (MODE_FLASH(fled_id) |
+ MODE_FLASH_EXTERNAL(fled_id));
+ else
+ led->allowed_modes |= MODE_TORCH(fled_id);
+}
+
+static void max77693_distribute_currents(struct max77693_led_device *led,
+ int fled_id, enum max77693_led_mode mode,
+ u32 micro_amp, u32 iout_max[2], u32 iout[2])
+{
+ if (!led->iout_joint) {
+ iout[fled_id] = micro_amp;
+ max77693_add_allowed_modes(led, fled_id, mode);
+ return;
+ }
+
+ iout[FLED1] = min(micro_amp, iout_max[FLED1]);
+ iout[FLED2] = micro_amp - iout[FLED1];
+
+ if (mode == FLASH)
+ led->allowed_modes &= ~MODE_FLASH_MASK;
+ else
+ led->allowed_modes &= ~MODE_TORCH_MASK;
+
+ max77693_add_allowed_modes(led, FLED1, mode);
+
+ if (iout[FLED2])
+ max77693_add_allowed_modes(led, FLED2, mode);
+}
+
+static int max77693_set_torch_current(struct max77693_led_device *led,
+ int fled_id, u32 micro_amp)
+{
+ struct regmap *rmap = led->regmap;
+ u8 iout1_reg = 0, iout2_reg = 0;
+ u32 iout[2];
+
+ max77693_distribute_currents(led, fled_id, TORCH, micro_amp,
+ led->iout_torch_max, iout);
+
+ if (fled_id == FLED1 || led->iout_joint) {
+ iout1_reg = max77693_led_iout_to_reg(iout[FLED1]);
+ led->torch_iout_reg &= TORCH_IOUT_MASK(TORCH_IOUT2_SHIFT);
+ }
+ if (fled_id == FLED2 || led->iout_joint) {
+ iout2_reg = max77693_led_iout_to_reg(iout[FLED2]);
+ led->torch_iout_reg &= TORCH_IOUT_MASK(TORCH_IOUT1_SHIFT);
+ }
+
+ 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_device *led,
+ int fled_id,
+ u32 micro_amp)
+{
+ struct regmap *rmap = led->regmap;
+ u8 iout1_reg, iout2_reg;
+ u32 iout[2];
+ int ret = -EINVAL;
+
+ max77693_distribute_currents(led, fled_id, FLASH, micro_amp,
+ led->iout_flash_max, iout);
+
+ if (fled_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 (fled_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_device *led, u32 microsec)
+{
+ struct regmap *rmap = led->regmap;
+ u8 v;
+ int ret;
+
+ v = max77693_flash_timeout_to_reg(microsec) | FLASH_TMR_LEVEL;
+
+ ret = regmap_write(rmap, MAX77693_LED_REG_FLASH_TIMER, v);
+ if (ret < 0)
+ return ret;
+
+ led->current_flash_timeout = microsec;
+
+ return 0;
+}
+
+static int max77693_get_strobe_status(struct max77693_led_device *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_get_flash_faults(struct max77693_sub_led *sub_led)
+{
+ struct max77693_led_device *led = sub_led_to_led(sub_led);
+ struct regmap *rmap = led->regmap;
+ unsigned int v;
+ u8 fault_open_mask, fault_short_mask;
+ int ret;
+
+ sub_led->flash_faults = 0;
+
+ if (led->iout_joint) {
+ fault_open_mask = FLASH_INT_FLED1_OPEN | FLASH_INT_FLED2_OPEN;
+ fault_short_mask = FLASH_INT_FLED1_SHORT |
+ FLASH_INT_FLED2_SHORT;
+ } else {
+ fault_open_mask = (sub_led->fled_id == FLED1) ?
+ FLASH_INT_FLED1_OPEN :
+ FLASH_INT_FLED2_OPEN;
+ fault_short_mask = (sub_led->fled_id == FLED1) ?
+ FLASH_INT_FLED1_SHORT :
+ FLASH_INT_FLED2_SHORT;
+ }
+
+ ret = regmap_read(rmap, MAX77693_LED_REG_FLASH_INT, &v);
+ if (ret < 0)
+ return ret;
+
+ if (v & fault_open_mask)
+ sub_led->flash_faults |= LED_FAULT_OVER_VOLTAGE;
+ if (v & fault_short_mask)
+ sub_led->flash_faults |= LED_FAULT_SHORT_CIRCUIT;
+ if (v & FLASH_INT_OVER_CURRENT)
+ sub_led->flash_faults |= LED_FAULT_OVER_CURRENT;
+
+ return 0;
+}
+
+static int max77693_setup(struct max77693_led_device *led,
+ struct max77693_led_config_data *led_cfg)
+{
+ 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] = led_cfg->iout_flash_max[FLED1] +
+ led_cfg->iout_flash_max[FLED2];
+ } else {
+ first_led = max77693_fled_used(led, FLED1) ? FLED1 : FLED2;
+ last_led = max77693_fled_used(led, FLED2) ? FLED2 : FLED1;
+ max_flash_curr[FLED1] = led_cfg->iout_flash_max[FLED1];
+ max_flash_curr[FLED2] = led_cfg->iout_flash_max[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;
+
+ if (led_cfg->low_vsys > 0)
+ v = max77693_led_vsys_to_reg(led_cfg->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 (led_cfg->boost_mode == MAX77693_LED_BOOST_FIXED)
+ v = FLASH_BOOST_FIXED;
+ else
+ v = led_cfg->boost_mode | led_cfg->boost_mode << 1;
+
+ if (max77693_fled_used(led, FLED1) && max77693_fled_used(led, 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(led_cfg->boost_vout);
+ ret = regmap_write(rmap, MAX77693_LED_REG_VOUT_FLASH1, v);
+ if (ret < 0)
+ return ret;
+
+ return max77693_set_mode_reg(led, MODE_OFF);
+}
+
+static int __max77693_led_brightness_set(struct max77693_led_device *led,
+ int fled_id, enum led_brightness value)
+{
+ int ret;
+
+ mutex_lock(&led->lock);
+
+ if (value == 0) {
+ ret = max77693_clear_mode(led, MODE_TORCH(fled_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, fled_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_TORCH(fled_id));
+ if (ret < 0)
+ dev_dbg(&led->pdev->dev,
+ "Failed to set torch mode (%d)\n",
+ ret);
+unlock:
+ mutex_unlock(&led->lock);
+ return ret;
+}
+
+static void max77693_led_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_device *led = sub_led_to_led(sub_led);
+
+ __max77693_led_brightness_set(led, sub_led->fled_id,
+ sub_led->torch_brightness);
+}
+
+/* LED subsystem callbacks */
+
+static int max77693_led_brightness_set_sync(
+ struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+ struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+ struct max77693_led_device *led = sub_led_to_led(sub_led);
+
+ return __max77693_led_brightness_set(led, sub_led->fled_id, value);
+}
+
+static void max77693_led_brightness_set(
+ struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+ struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+
+ sub_led->torch_brightness = value;
+ schedule_work(&sub_led->work_brightness_set);
+}
+
+static int max77693_led_flash_brightness_set(
+ struct led_classdev_flash *fled_cdev,
+ u32 brightness)
+{
+ struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+ struct max77693_led_device *led = sub_led_to_led(sub_led);
+ int ret;
+
+ mutex_lock(&led->lock);
+ ret = max77693_set_flash_current(led, sub_led->fled_id, brightness);
+ mutex_unlock(&led->lock);
+
+ return ret;
+}
+
+static int max77693_led_flash_strobe_set(
+ struct led_classdev_flash *fled_cdev,
+ bool state)
+{
+ struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+ struct max77693_led_device *led = sub_led_to_led(sub_led);
+ int fled_id = sub_led->fled_id;
+ int ret;
+
+ mutex_lock(&led->lock);
+
+ if (!state) {
+ ret = max77693_clear_mode(led, MODE_FLASH(fled_id));
+ goto unlock;
+ }
+
+ if (sub_led->flash_timeout != led->current_flash_timeout) {
+ ret = max77693_set_timeout(led, sub_led->flash_timeout);
+ if (ret < 0)
+ goto unlock;
+ }
+
+ led->strobing_sub_led_id = fled_id;
+
+ ret = max77693_add_mode(led, MODE_FLASH(fled_id));
+ if (ret < 0)
+ goto unlock;
+
+ ret = max77693_get_flash_faults(sub_led);
+
+unlock:
+ mutex_unlock(&led->lock);
+ return ret;
+}
+
+static int max77693_led_flash_fault_get(
+ struct led_classdev_flash *fled_cdev,
+ u32 *fault)
+{
+ struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+
+ *fault = sub_led->flash_faults;
+
+ return 0;
+}
+
+static int max77693_led_flash_strobe_get(
+ struct led_classdev_flash *fled_cdev,
+ bool *state)
+{
+ struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+ struct max77693_led_device *led = sub_led_to_led(sub_led);
+ int ret;
+
+ if (!state)
+ return -EINVAL;
+
+ mutex_lock(&led->lock);
+
+ ret = max77693_get_strobe_status(led, state);
+
+ *state = !!(*state && (led->strobing_sub_led_id == sub_led->fled_id));
+
+ mutex_unlock(&led->lock);
+
+ return ret;
+}
+
+static int max77693_led_flash_timeout_set(
+ struct led_classdev_flash *fled_cdev,
+ u32 timeout)
+{
+ struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev);
+ struct max77693_led_device *led = sub_led_to_led(sub_led);
+
+ mutex_lock(&led->lock);
+ sub_led->flash_timeout = timeout;
+ mutex_unlock(&led->lock);
+
+ return 0;
+}
+
+static int max77693_led_parse_dt(struct max77693_led_device *led,
+ struct max77693_led_config_data *cfg)
+{
+ struct device *dev = &led->pdev->dev;
+ struct max77693_sub_led *sub_leds = led->sub_leds;
+ struct device_node *node = dev->of_node, *child_node;
+ struct property *prop;
+ u32 led_sources[2];
+ int i, ret, fled_id;
+
+ of_property_read_u32(node, "maxim,boost-mode", &cfg->boost_mode);
+ of_property_read_u32(node, "maxim,boost-mvout", &cfg->boost_vout);
+ of_property_read_u32(node, "maxim,mvsys-min", &cfg->low_vsys);
+
+ for_each_available_child_of_node(node, child_node) {
+ prop = of_find_property(child_node, "led-sources", NULL);
+ if (prop) {
+ const __be32 *srcs = NULL;
+
+ for (i = 0; i < ARRAY_SIZE(led_sources); ++i) {
+ srcs = of_prop_next_u32(prop, srcs,
+ &led_sources[i]);
+ if (!srcs)
+ break;
+ }
+ } else {
+ dev_err(dev,
+ "led-sources DT property missing\n");
+ of_node_put(child_node);
+ return -EINVAL;
+ }
+
+ if (i == 2) {
+ fled_id = FLED1;
+ led->fled_mask = FLED1_IOUT | FLED2_IOUT;
+ } else if (led_sources[0] == FLED1) {
+ fled_id = FLED1;
+ led->fled_mask |= FLED1_IOUT;
+ } else if (led_sources[0] == FLED2) {
+ fled_id = FLED2;
+ led->fled_mask |= FLED2_IOUT;
+ } else {
+ dev_err(dev,
+ "Wrong led-sources DT property value.\n");
+ of_node_put(child_node);
+ return -EINVAL;
+ }
+
+ sub_leds[fled_id].fled_id = fled_id;
+
+ cfg->label[fled_id] =
+ of_get_property(child_node, "label", NULL) ? :
+ child_node->name;
+
+ ret = of_property_read_u32(child_node, "led-max-microamp",
+ &cfg->iout_torch_max[fled_id]);
+ if (ret < 0) {
+ cfg->iout_torch_max[fled_id] = TORCH_IOUT_MIN;
+ dev_warn(dev, "led-max-microamp DT property missing\n");
+ }
+
+ ret = of_property_read_u32(child_node, "flash-max-microamp",
+ &cfg->iout_flash_max[fled_id]);
+ if (ret < 0) {
+ cfg->iout_flash_max[fled_id] = FLASH_IOUT_MIN;
+ dev_warn(dev,
+ "flash-max-microamp DT property missing\n");
+ }
+
+ ret = of_property_read_u32(child_node, "flash-max-timeout-us",
+ &cfg->flash_timeout_max[fled_id]);
+ if (ret < 0) {
+ cfg->flash_timeout_max[fled_id] = FLASH_TIMEOUT_MIN;
+ dev_warn(dev,
+ "flash-max-timeout-us DT property missing\n");
+ }
+
+ if (++cfg->num_leds == 2 ||
+ (max77693_fled_used(led, FLED1) &&
+ max77693_fled_used(led, FLED2))) {
+ of_node_put(child_node);
+ break;
+ }
+ }
+
+ if (cfg->num_leds == 0) {
+ dev_err(dev, "No DT child node found for connected LED(s).\n");
+ return -EINVAL;
+ }
+
+ 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_align_iout_current(struct max77693_led_device *led,
+ u32 *iout, u32 min, u32 max, u32 step)
+{
+ int i;
+
+ if (led->iout_joint) {
+ if (iout[FLED1] > min) {
+ iout[FLED1] /= 2;
+ iout[FLED2] = iout[FLED1];
+ } else {
+ iout[FLED1] = min;
+ iout[FLED2] = 0;
+ return;
+ }
+ }
+
+ for (i = FLED1; i <= FLED2; ++i)
+ if (max77693_fled_used(led, i))
+ clamp_align(&iout[i], min, max, step);
+ else
+ iout[i] = 0;
+}
+
+static void max77693_led_validate_configuration(struct max77693_led_device *led,
+ struct max77693_led_config_data *cfg)
+{
+ u32 flash_iout_max = cfg->boost_mode ? FLASH_IOUT_MAX_2LEDS :
+ FLASH_IOUT_MAX_1LED;
+ int i;
+
+ if (cfg->num_leds == 1 &&
+ max77693_fled_used(led, FLED1) && max77693_fled_used(led, FLED2))
+ led->iout_joint = true;
+
+ cfg->boost_mode = clamp_val(cfg->boost_mode, MAX77693_LED_BOOST_NONE,
+ MAX77693_LED_BOOST_FIXED);
+
+ /* Boost must be enabled if both current outputs are used */
+ if ((cfg->boost_mode == MAX77693_LED_BOOST_NONE) && led->iout_joint)
+ cfg->boost_mode = MAX77693_LED_BOOST_FIXED;
+
+ max77693_align_iout_current(led, cfg->iout_torch_max,
+ TORCH_IOUT_MIN, TORCH_IOUT_MAX, TORCH_IOUT_STEP);
+
+ max77693_align_iout_current(led, cfg->iout_flash_max,
+ FLASH_IOUT_MIN, flash_iout_max, FLASH_IOUT_STEP);
+
+ for (i = 0; i < ARRAY_SIZE(cfg->flash_timeout_max); ++i)
+ clamp_align(&cfg->flash_timeout_max[i], FLASH_TIMEOUT_MIN,
+ FLASH_TIMEOUT_MAX, FLASH_TIMEOUT_STEP);
+
+ clamp_align(&cfg->boost_vout, FLASH_VOUT_MIN, FLASH_VOUT_MAX,
+ FLASH_VOUT_STEP);
+
+ if (cfg->low_vsys)
+ clamp_align(&cfg->low_vsys, MAX_FLASH1_VSYS_MIN,
+ MAX_FLASH1_VSYS_MAX, MAX_FLASH1_VSYS_STEP);
+}
+
+static int max77693_led_get_configuration(struct max77693_led_device *led,
+ struct max77693_led_config_data *cfg)
+{
+ int ret;
+
+ ret = max77693_led_parse_dt(led, cfg);
+ if (ret < 0)
+ return ret;
+
+ max77693_led_validate_configuration(led, cfg);
+
+ memcpy(led->iout_torch_max, cfg->iout_torch_max,
+ sizeof(led->iout_torch_max));
+ memcpy(led->iout_flash_max, cfg->iout_flash_max,
+ sizeof(led->iout_flash_max));
+
+ return 0;
+}
+
+static const struct led_flash_ops flash_ops = {
+ .flash_brightness_set = max77693_led_flash_brightness_set,
+ .strobe_set = max77693_led_flash_strobe_set,
+ .strobe_get = max77693_led_flash_strobe_get,
+ .timeout_set = max77693_led_flash_timeout_set,
+ .fault_get = max77693_led_flash_fault_get,
+};
+
+static void max77693_init_flash_settings(struct max77693_sub_led *sub_led,
+ struct max77693_led_config_data *led_cfg)
+{
+ struct led_classdev_flash *fled_cdev = &sub_led->fled_cdev;
+ struct max77693_led_device *led = sub_led_to_led(sub_led);
+ int fled_id = sub_led->fled_id;
+ struct led_flash_setting *setting;
+
+ /* Init flash intensity setting */
+ setting = &fled_cdev->brightness;
+ setting->min = FLASH_IOUT_MIN;
+ setting->max = led->iout_joint ?
+ led_cfg->iout_flash_max[FLED1] +
+ led_cfg->iout_flash_max[FLED2] :
+ led_cfg->iout_flash_max[fled_id];
+ setting->step = FLASH_IOUT_STEP;
+ setting->val = setting->max;
+
+ /* Init flash timeout setting */
+ setting = &fled_cdev->timeout;
+ setting->min = FLASH_TIMEOUT_MIN;
+ setting->max = led_cfg->flash_timeout_max[fled_id];
+ setting->step = FLASH_TIMEOUT_STEP;
+ setting->val = setting->max;
+}
+
+static void max77693_init_fled_cdev(struct max77693_sub_led *sub_led,
+ struct max77693_led_config_data *led_cfg)
+{
+ struct max77693_led_device *led = sub_led_to_led(sub_led);
+ int fled_id = sub_led->fled_id;
+ struct led_classdev_flash *fled_cdev;
+ struct led_classdev *led_cdev;
+
+ /* Initialize LED Flash class device */
+ fled_cdev = &sub_led->fled_cdev;
+ fled_cdev->ops = &flash_ops;
+ led_cdev = &fled_cdev->led_cdev;
+
+ led_cdev->name = led_cfg->label[fled_id];
+
+ led_cdev->brightness_set = max77693_led_brightness_set;
+ led_cdev->brightness_set_sync = max77693_led_brightness_set_sync;
+ led_cdev->max_brightness = (led->iout_joint ?
+ led_cfg->iout_torch_max[FLED1] +
+ led_cfg->iout_torch_max[FLED2] :
+ led_cfg->iout_torch_max[fled_id]) /
+ TORCH_IOUT_STEP;
+ led_cdev->flags |= LED_DEV_CAP_FLASH;
+ INIT_WORK(&sub_led->work_brightness_set,
+ max77693_led_brightness_set_work);
+
+ max77693_init_flash_settings(sub_led, led_cfg);
+
+ /* Init flash timeout cache */
+ sub_led->flash_timeout = fled_cdev->timeout.val;
+}
+
+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_device *led;
+ struct max77693_sub_led *sub_leds;
+ struct max77693_led_config_data led_cfg = {};
+ int init_fled_cdev[2], i, ret;
+
+ led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ led->pdev = pdev;
+ led->regmap = iodev->regmap;
+ led->allowed_modes = MODE_FLASH_MASK;
+ sub_leds = led->sub_leds;
+
+ platform_set_drvdata(pdev, led);
+ ret = max77693_led_get_configuration(led, &led_cfg);
+ if (ret < 0)
+ return ret;
+
+ ret = max77693_setup(led, &led_cfg);
+ if (ret < 0)
+ return ret;
+
+ mutex_init(&led->lock);
+
+ init_fled_cdev[FLED1] =
+ led->iout_joint || max77693_fled_used(led, FLED1);
+ init_fled_cdev[FLED2] =
+ !led->iout_joint && max77693_fled_used(led, FLED2);
+
+ for (i = FLED1; i <= FLED2; ++i) {
+ if (!init_fled_cdev[i])
+ continue;
+
+ /* Initialize LED Flash class device */
+ max77693_init_fled_cdev(&sub_leds[i], &led_cfg);
+
+ /* Register LED Flash class device */
+ ret = led_classdev_flash_register(dev, &sub_leds[i].fled_cdev);
+ if (ret < 0) {
+ /*
+ * At this moment FLED1 might have been already
+ * registered and it needs to be released.
+ */
+ if (i == FLED2)
+ goto err_register_led2;
+ else
+ goto err_register_led1;
+ }
+ }
+
+ return 0;
+
+err_register_led2:
+ /* It is possible than only FLED2 was to be registered */
+ if (!init_fled_cdev[FLED1])
+ goto err_register_led1;
+ led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
+err_register_led1:
+ mutex_destroy(&led->lock);
+
+ return ret;
+}
+
+static int max77693_led_remove(struct platform_device *pdev)
+{
+ struct max77693_led_device *led = platform_get_drvdata(pdev);
+ struct max77693_sub_led *sub_leds = led->sub_leds;
+
+ if (led->iout_joint || max77693_fled_used(led, FLED1)) {
+ led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
+ cancel_work_sync(&sub_leds[FLED1].work_brightness_set);
+ }
+
+ if (!led->iout_joint && max77693_fled_used(led, FLED2)) {
+ led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev);
+ cancel_work_sync(&sub_leds[FLED2].work_brightness_set);
+ }
+
+ mutex_destroy(&led->lock);
+
+ return 0;
+}
+
+static const struct of_device_id max77693_led_dt_match[] = {
+ { .compatible = "maxim,max77693-led" },
+ {},
+};
+
+static struct platform_driver max77693_led_driver = {
+ .probe = max77693_led_probe,
+ .remove = max77693_led_remove,
+ .driver = {
+ .name = "max77693-led",
+ .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 v2");
projects / openwrt / staging / blogic.git / commitdiff