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linux-sg2042/drivers/leds/leds-max77693.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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>
*/
#include <linux/led-class-flash.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-common.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 <media/v4l2-flash-led-class.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;
/* V4L2 Flash device */
struct v4l2_flash *v4l2_flash;
/* 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);
}
/* LED subsystem callbacks */
static int 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);
struct max77693_led_device *led = sub_led_to_led(sub_led);
int fled_id = sub_led->fled_id, 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 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_node **sub_nodes)
{
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;
}
if (sub_nodes[fled_id]) {
dev_err(dev,
"Conflicting \"led-sources\" DT properties\n");
of_node_put(child_node);
return -EINVAL;
}
sub_nodes[fled_id] = child_node;
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,
struct device_node **sub_nodes)
{
int ret;
ret = max77693_led_parse_dt(led, cfg, sub_nodes);
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;
}
#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
static int max77693_led_external_strobe_set(
struct v4l2_flash *v4l2_flash,
bool enable)
{
struct max77693_sub_led *sub_led =
flcdev_to_sub_led(v4l2_flash->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 (enable)
ret = max77693_add_mode(led, MODE_FLASH_EXTERNAL(fled_id));
else
ret = max77693_clear_mode(led, MODE_FLASH_EXTERNAL(fled_id));
mutex_unlock(&led->lock);
return ret;
}
static void max77693_init_v4l2_flash_config(struct max77693_sub_led *sub_led,
struct max77693_led_config_data *led_cfg,
struct v4l2_flash_config *v4l2_sd_cfg)
{
struct max77693_led_device *led = sub_led_to_led(sub_led);
struct device *dev = &led->pdev->dev;
struct max77693_dev *iodev = dev_get_drvdata(dev->parent);
struct i2c_client *i2c = iodev->i2c;
struct led_flash_setting *s;
snprintf(v4l2_sd_cfg->dev_name, sizeof(v4l2_sd_cfg->dev_name),
"%s %d-%04x", sub_led->fled_cdev.led_cdev.name,
i2c_adapter_id(i2c->adapter), i2c->addr);
s = &v4l2_sd_cfg->intensity;
s->min = TORCH_IOUT_MIN;
s->max = sub_led->fled_cdev.led_cdev.max_brightness * TORCH_IOUT_STEP;
s->step = TORCH_IOUT_STEP;
s->val = s->max;
/* Init flash faults config */
v4l2_sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE |
LED_FAULT_SHORT_CIRCUIT |
LED_FAULT_OVER_CURRENT;
v4l2_sd_cfg->has_external_strobe = true;
}
static const struct v4l2_flash_ops v4l2_flash_ops = {
.external_strobe_set = max77693_led_external_strobe_set,
};
#else
static inline void max77693_init_v4l2_flash_config(
struct max77693_sub_led *sub_led,
struct max77693_led_config_data *led_cfg,
struct v4l2_flash_config *v4l2_sd_cfg)
{
}
static const struct v4l2_flash_ops v4l2_flash_ops;
#endif
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_blocking = max77693_led_brightness_set;
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;
max77693_init_flash_settings(sub_led, led_cfg);
/* Init flash timeout cache */
sub_led->flash_timeout = fled_cdev->timeout.val;
}
static int max77693_register_led(struct max77693_sub_led *sub_led,
struct max77693_led_config_data *led_cfg,
struct device_node *sub_node)
{
struct max77693_led_device *led = sub_led_to_led(sub_led);
struct led_classdev_flash *fled_cdev = &sub_led->fled_cdev;
struct device *dev = &led->pdev->dev;
struct v4l2_flash_config v4l2_sd_cfg = {};
int ret;
/* Register in the LED subsystem */
ret = led_classdev_flash_register(dev, fled_cdev);
if (ret < 0)
return ret;
max77693_init_v4l2_flash_config(sub_led, led_cfg, &v4l2_sd_cfg);
/* Register in the V4L2 subsystem. */
sub_led->v4l2_flash = v4l2_flash_init(dev, of_fwnode_handle(sub_node),
fled_cdev, &v4l2_flash_ops,
&v4l2_sd_cfg);
if (IS_ERR(sub_led->v4l2_flash)) {
ret = PTR_ERR(sub_led->v4l2_flash);
goto err_v4l2_flash_init;
}
return 0;
err_v4l2_flash_init:
led_classdev_flash_unregister(fled_cdev);
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_device *led;
struct max77693_sub_led *sub_leds;
struct device_node *sub_nodes[2] = {};
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, sub_nodes);
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 and corresponding
* V4L2 Flash device.
*/
ret = max77693_register_led(&sub_leds[i], &led_cfg,
sub_nodes[i]);
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;
v4l2_flash_release(sub_leds[FLED1].v4l2_flash);
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)) {
v4l2_flash_release(sub_leds[FLED1].v4l2_flash);
led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
}
if (!led->iout_joint && max77693_fled_used(led, FLED2)) {
v4l2_flash_release(sub_leds[FLED2].v4l2_flash);
led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev);
}
mutex_destroy(&led->lock);
return 0;
}
static const struct of_device_id max77693_led_dt_match[] = {
{ .compatible = "maxim,max77693-led" },
{},
};
MODULE_DEVICE_TABLE(of, max77693_led_dt_match);
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");
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