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CoolPi-Armbian-Rockchip-RK3.../drivers/media/i2c/aw36518.c

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// SPDX-License-Identifier: GPL-2.0
/*
* General device driver for awinic aw36518, FLASH LED Driver
*
* Copyright (C) 2022 Rockchip Electronics Co., Ltd.
*
* V0.0X01.0X00 init version.
* V0.0X01.0X01 fix power off torch not off issue.
* V0.0X01.0X02 fix get wrong time info issue.
*/
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm_runtime.h>
#include <linux/rk-camera-module.h>
#include <linux/rk-led-flash.h>
#include <linux/slab.h>
#include <linux/version.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <linux/compat.h>
#define DRIVER_VERSION KERNEL_VERSION(0, 0x01, 0x02)
#define AW36518_NAME "aw36518"
#define AW36518_REG_ID 0x00
#define AW36518_ID 0x30
#define AW36518_REG_MODE 0x01
#define AW36518_REG_LED0_FLASH_CUR 0x03
#define AW36518_REG_LED0_TORCH_CUR 0x05
#define AW36518_REG_LED1_FLASH_CUR 0x03
#define AW36518_REG_LED1_TORCH_CUR 0x05
#define AW36518_HW_TORCH BIT(4)
#define AW36518_HW_STROBE BIT(5)
#define AW36518_REG_FAULT 0x0A
#define AW36518_REG_FL_SC 0x70
#define AW36518_REG_FL_OT BIT(2)
#define AW36518_REG_FL_TO BIT(0)
#define AW36518_REG_FAULT2 0x0B
#define AW36518_REG_FL_OVP BIT(1)
#define AW36518_REG_ENABLE 0x01
#define LED_ON 0x03
#define LED_OFF 0x00
/* FLASH Brightness
* min 2940uA, step 5870uA, max 1500000uA
*/
#define AW36518_MIN_FLASH_INTENSITY 2940
#define AW36518_MAX_FLASH_INTENSITY 1500000
#define AW36518_FLASH_INTENSITY_DEFAULT 748430
#define AW36518_FLASH_INTENSITY_STEP 5870
#define AW36518_FLASH_BRT_uA_TO_REG(a) \
((a) < AW36518_MIN_FLASH_INTENSITY ? 0 : \
(((a) - AW36518_MIN_FLASH_INTENSITY) / AW36518_FLASH_INTENSITY_STEP))
#define AW36518_FLASH_BRT_REG_TO_uA(a) \
((a) * AW36518_FLASH_INTENSITY_STEP + AW36518_MIN_FLASH_INTENSITY)
/* TORCH BRT
* min 750uA, step 1510uA, max 3860000uA
*/
#define AW36518_MIN_TORCH_INTENSITY 750
#define AW36518_MAX_TORCH_INTENSITY 386000
#define AW36518_TORCH_INTENSITY_DEFAULT 192000
#define AW36518_TORCH_INTENSITY_STEP 1510
#define AW36518_TORCH_BRT_uA_TO_REG(a) \
((a) < AW36518_MIN_TORCH_INTENSITY ? 0 : \
(((a) - AW36518_MIN_TORCH_INTENSITY) / AW36518_TORCH_INTENSITY_STEP))
#define AW36518_TORCH_BRT_REG_TO_uA(a) \
((a) * AW36518_TORCH_INTENSITY_STEP + AW36518_MIN_TORCH_INTENSITY)
/* FLASH TIMEOUT DURATION
* min 40ms, step 40 or 200ms, max 1600ms
*/
#define TIMEOUT_MAX 1600000
#define TIMEOUT_STEP 40000
#define TIMEOUT_MIN 40000
#define TIMEOUT_STEP2 200000
#define TIMEOUT_DEFAULT 600000
#define AW36518_FLASH_TOUT_ms_TO_REG(a) \
((a) < TIMEOUT_MIN ? 0 : \
(((a) - TIMEOUT_MIN) / TIMEOUT_STEP))
#define AW36518_FLASH_TOUT_REG_TO_ms(a) \
((a) * TIMEOUT_STEP + TIMEOUT_MIN)
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "debug level (0-2)");
enum aw36518_led_id {
LED0 = 0,
LED1,
LED_MAX
};
struct aw36518_led {
struct v4l2_subdev sd;
struct v4l2_ctrl_handler ctrls;
struct v4l2_ctrl *flash_brt;
struct v4l2_ctrl *torch_brt;
struct __kernel_old_timeval timestamp;
u32 max_flash_timeout;
u32 max_flash_intensity;
u32 max_torch_intensity;
};
struct aw36518_flash {
struct i2c_client *client;
struct aw36518_led leds[LED_MAX];
struct gpio_desc *en_gpio;
struct gpio_desc *torch_gpio;
struct gpio_desc *strobe_gpio;
struct gpio_desc *tx_gpio;
struct mutex lock;
u32 flash_timeout;
enum v4l2_flash_led_mode led_mode;
u32 module_index;
const char *module_facing;
bool power_on;
};
#define to_led(sd) container_of(sd, struct aw36518_led, sd)
static int aw36518_i2c_write(struct aw36518_flash *flash, u8 reg, u8 val)
{
struct i2c_client *client = flash->client;
int ret;
ret = i2c_smbus_write_byte_data(client, reg, val);
if (ret < 0)
dev_err(&client->dev,
"%s: reg:0x%x val:0x%x failed\n",
__func__, reg, val);
v4l2_dbg(2, debug, &flash->leds[0].sd,
"%s: reg:0x%x val:0x%x\n",
__func__, reg, val);
return ret;
}
static int aw36518_i2c_read(struct aw36518_flash *flash, u8 reg)
{
struct i2c_client *client = flash->client;
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
dev_err(&client->dev,
"%s: reg:0x%x failed\n",
__func__, reg);
dev_dbg(&client->dev, "%s: reg:0x%x val:0x%x\n",
__func__, reg, ret);
return ret;
}
static int aw36518_led_on(struct aw36518_flash *flash, bool on)
{
int ret;
struct i2c_client *client = flash->client;
int temp;
u8 val = 0;
v4l2_dbg(1, debug, &flash->leds[0].sd,
"%s: on:%d\n", __func__, on);
temp = aw36518_i2c_read(flash, AW36518_REG_ENABLE);
if (temp < 0)
dev_err(&client->dev,
"%s: read reg:0x%x failed.\n",
__func__, AW36518_REG_ENABLE);
if (flash->led_mode == V4L2_FLASH_LED_MODE_FLASH && on)
temp = temp | 0x0c;
else
temp = temp & 0xfc;
v4l2_dbg(1, debug, &flash->leds[0].sd,
"%s: temp:%d\n", __func__, temp);
val = on ? LED_ON : LED_OFF;
ret = aw36518_i2c_write(flash, AW36518_REG_ENABLE, val | temp);
flash->leds[0].timestamp = ns_to_kernel_old_timeval(ktime_get_ns());
flash->leds[1].timestamp = flash->leds[0].timestamp;
return ret;
}
static int aw36518_get_fault(struct aw36518_flash *flash)
{
int fault = 0;
int temp = 0;
fault = aw36518_i2c_read(flash, AW36518_REG_FAULT);
v4l2_dbg(1, debug, &flash->leds[0].sd,
"%s: 0x%x\n", __func__, fault);
fault = fault & 0xfd;
temp = aw36518_i2c_read(flash, AW36518_REG_FAULT2);
fault = fault | (temp & 0x2);
return fault;
}
static int aw36518_timeout_cal(struct aw36518_flash *flash)
{
u8 val;
v4l2_dbg(1, debug, &flash->leds[0].sd,
"%s: timeout:%dUS\n", __func__, flash->flash_timeout);
if (flash->flash_timeout < 400000)
val = AW36518_FLASH_TOUT_ms_TO_REG(flash->flash_timeout);
else {
val = (flash->flash_timeout - 0x400000) / TIMEOUT_STEP2;
val = val + 0x09;
}
return val;
}
static int aw36518_set_timeout(struct aw36518_flash *flash, u32 timeout)
{
int ret;
u8 val;
v4l2_dbg(1, debug, &flash->leds[0].sd,
"%s: %d\n",
__func__, flash->flash_timeout);
flash->flash_timeout = timeout;
ret = aw36518_i2c_read(flash, 0x08);
if (ret < 0)
return ret;
val = aw36518_timeout_cal(flash);
return aw36518_i2c_write(flash, 0x08, val | (ret & 0xf0));
}
static int aw36518_torch_brt(struct aw36518_flash *flash,
enum aw36518_led_id id)
{
struct aw36518_led *led = &flash->leds[id];
u8 val, reg;
v4l2_dbg(1, debug, &led->sd,
"%s: %d\n", __func__, led->torch_brt->val);
val = AW36518_TORCH_BRT_uA_TO_REG(led->torch_brt->val);
reg = id ? AW36518_REG_LED1_TORCH_CUR : AW36518_REG_LED0_TORCH_CUR;
return aw36518_i2c_write(flash, reg, val);
}
static int aw36518_flash_brt(struct aw36518_flash *flash,
enum aw36518_led_id id)
{
struct aw36518_led *led = &flash->leds[id];
u8 val, reg;
v4l2_dbg(1, debug, &led->sd,
"%s: %d\n", __func__, led->flash_brt->val);
val = AW36518_FLASH_BRT_uA_TO_REG(led->flash_brt->val);
reg = id ? AW36518_REG_LED1_FLASH_CUR : AW36518_REG_LED0_FLASH_CUR;
return aw36518_i2c_write(flash, reg, val);
}
static int aw36518_set_mode(struct aw36518_flash *flash,
enum aw36518_led_id id, unsigned int mode)
{
int ret = 0;
v4l2_dbg(1, debug, &flash->leds[id].sd,
"%s: %d cur:%d\n", __func__,
mode, flash->led_mode);
if (flash->led_mode == mode)
return 0;
aw36518_led_on(flash, false);
flash->led_mode = mode;
if (mode == V4L2_FLASH_LED_MODE_FLASH) {
ret = aw36518_i2c_write(flash, 0x01, 0x0C);
ret |= aw36518_flash_brt(flash, LED0);
} else if (mode == V4L2_FLASH_LED_MODE_TORCH) {
//ret = aw36518_i2c_write(flash, 0x01, 0x08);
/* hw torch/strobe io trigger torch */
ret = aw36518_i2c_write(flash, 0x01, AW36518_HW_TORCH);
ret |= aw36518_torch_brt(flash, LED0);
ret |= aw36518_led_on(flash, true);
if (flash->torch_gpio) {
v4l2_dbg(1, debug, &flash->leds[id].sd,
"%s:set torch gpio high.\n", __func__);
gpiod_set_value_cansleep(flash->torch_gpio, 1);
}
} else {
ret = aw36518_i2c_write(flash, 0x01, 0x00);
if (flash->torch_gpio) {
v4l2_dbg(1, debug, &flash->leds[id].sd,
"%s:set torch gpio low.\n", __func__);
gpiod_set_value_cansleep(flash->torch_gpio, 0);
}
}
return ret;
}
static int aw36518_strobe(struct aw36518_flash *flash, bool on)
{
int ret;
v4l2_dbg(1, debug, &flash->leds[0].sd,
"%s: on %d\n", __func__, on);
if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
return -EBUSY;
ret = aw36518_led_on(flash, on);
return ret;
}
static int aw36518_get_ctrl(struct v4l2_ctrl *ctrl, enum aw36518_led_id id)
{
struct aw36518_led *led =
container_of(ctrl->handler, struct aw36518_led, ctrls);
struct aw36518_flash *flash =
container_of(led, struct aw36518_flash, leds[id]);
int ret = 0;
struct i2c_client *client = flash->client;
v4l2_dbg(1, debug, &flash->leds[id].sd,
"%s: id 0x%x\n", __func__, ctrl->id);
mutex_lock(&flash->lock);
switch (ctrl->id) {
case V4L2_CID_FLASH_FAULT:
ret = aw36518_get_fault(flash);
ctrl->val = 0;
if (ret & AW36518_REG_FL_SC)
ctrl->val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
if (ret & AW36518_REG_FL_OT)
ctrl->val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
if (ret & AW36518_REG_FL_TO)
ctrl->val |= V4L2_FLASH_FAULT_TIMEOUT;
if (ret & AW36518_REG_FL_OVP)
ctrl->val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;
ret = 0;
break;
default:
dev_err(&client->dev,
"ctrl 0x%x not supported\n", ctrl->id);
ret = -EINVAL;
break;
}
mutex_unlock(&flash->lock);
return ret;
}
static int aw36518_set_ctrl(struct v4l2_ctrl *ctrl, enum aw36518_led_id id)
{
struct aw36518_led *led =
container_of(ctrl->handler, struct aw36518_led, ctrls);
struct aw36518_flash *flash =
container_of(led, struct aw36518_flash, leds[id]);
int ret = 0;
struct i2c_client *client = flash->client;
v4l2_dbg(1, debug, &led->sd,
"%s: id 0x%x val 0x%x\n",
__func__, ctrl->id, ctrl->val);
mutex_lock(&flash->lock);
ret = aw36518_get_fault(flash);
if ((ret & (AW36518_REG_FL_OVP |
AW36518_REG_FL_OT |
AW36518_REG_FL_SC)) &&
(ctrl->id == V4L2_CID_FLASH_STROBE ||
ctrl->id == V4L2_CID_FLASH_TORCH_INTENSITY ||
ctrl->id == V4L2_CID_FLASH_LED_MODE)) {
ret = -EBUSY;
goto err;
}
switch (ctrl->id) {
case V4L2_CID_FLASH_LED_MODE:
ret = aw36518_set_mode(flash, id, ctrl->val);
break;
case V4L2_CID_FLASH_STROBE:
ret = aw36518_strobe(flash, true);
break;
case V4L2_CID_FLASH_STROBE_STOP:
ret = aw36518_strobe(flash, false);
break;
case V4L2_CID_FLASH_TIMEOUT:
ret = aw36518_set_timeout(flash, ctrl->val);
break;
case V4L2_CID_FLASH_INTENSITY:
ret = aw36518_flash_brt(flash, id);
break;
case V4L2_CID_FLASH_TORCH_INTENSITY:
ret = aw36518_torch_brt(flash, id);
break;
default:
dev_err(&client->dev,
"ctrl 0x%x not supported\n", ctrl->id);
ret = -EINVAL;
break;
}
err:
mutex_unlock(&flash->lock);
return ret;
}
static int aw36518_led0_get_ctrl(struct v4l2_ctrl *ctrl)
{
return aw36518_get_ctrl(ctrl, LED0);
}
static int aw36518_led0_set_ctrl(struct v4l2_ctrl *ctrl)
{
return aw36518_set_ctrl(ctrl, LED0);
}
static int aw36518_led1_get_ctrl(struct v4l2_ctrl *ctrl)
{
return aw36518_get_ctrl(ctrl, LED1);
}
static int aw36518_led1_set_ctrl(struct v4l2_ctrl *ctrl)
{
return aw36518_set_ctrl(ctrl, LED1);
}
static const struct v4l2_ctrl_ops aw36518_ctrl_ops[LED_MAX] = {
[LED0] = {
.g_volatile_ctrl = aw36518_led0_get_ctrl,
.s_ctrl = aw36518_led0_set_ctrl,
},
[LED1] = {
.g_volatile_ctrl = aw36518_led1_get_ctrl,
.s_ctrl = aw36518_led1_set_ctrl,
}
};
static int aw36518_init_controls(struct aw36518_flash *flash,
enum aw36518_led_id id)
{
struct v4l2_ctrl *fault;
struct v4l2_ctrl_handler *hdl = &flash->leds[id].ctrls;
const struct v4l2_ctrl_ops *ops = &aw36518_ctrl_ops[id];
struct aw36518_led *led = &flash->leds[id];
v4l2_ctrl_handler_init(hdl, 8);
v4l2_ctrl_new_std_menu(hdl, ops,
V4L2_CID_FLASH_LED_MODE,
V4L2_FLASH_LED_MODE_TORCH, ~0x7, 0);
flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
v4l2_ctrl_new_std_menu(hdl, ops,
V4L2_CID_FLASH_STROBE_SOURCE,
V4L2_FLASH_STROBE_SOURCE_SOFTWARE, ~0x1, 0);
v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_FLASH_TIMEOUT, TIMEOUT_MIN,
led->max_flash_timeout,
TIMEOUT_STEP,
led->max_flash_timeout);
flash->flash_timeout = led->max_flash_timeout;
flash->leds[id].flash_brt =
v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_FLASH_INTENSITY,
AW36518_MIN_FLASH_INTENSITY,
led->max_flash_intensity,
AW36518_FLASH_INTENSITY_STEP,
AW36518_FLASH_INTENSITY_DEFAULT);
flash->leds[id].torch_brt =
v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_FLASH_TORCH_INTENSITY,
AW36518_MIN_TORCH_INTENSITY,
led->max_torch_intensity,
AW36518_TORCH_INTENSITY_STEP,
AW36518_TORCH_INTENSITY_DEFAULT);
fault = v4l2_ctrl_new_std(hdl, ops,
V4L2_CID_FLASH_FAULT, 0,
V4L2_FLASH_FAULT_OVER_VOLTAGE
| V4L2_FLASH_FAULT_TIMEOUT
| V4L2_FLASH_FAULT_OVER_TEMPERATURE
| V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0);
if (hdl->error)
return hdl->error;
fault->flags |= V4L2_CTRL_FLAG_VOLATILE;
flash->leds[id].sd.ctrl_handler = hdl;
return 0;
}
static void aw36518_get_time_info(struct v4l2_subdev *sd,
struct __kernel_old_timeval *ti)
{
struct aw36518_led *led =
container_of(sd, struct aw36518_led, sd);
memset(ti, 0, sizeof(*ti));
ti->tv_sec = led->timestamp.tv_sec;
ti->tv_usec = led->timestamp.tv_usec;
v4l2_dbg(1, debug, sd,
"%s: tv_sec:%ld, tv_usec:%ld\n", __func__, ti->tv_sec, ti->tv_usec);
}
static long aw36518_ioctl(struct v4l2_subdev *sd,
unsigned int cmd, void *arg)
{
long ret = 0;
switch (cmd) {
case RK_VIDIOC_FLASH_TIMEINFO:
aw36518_get_time_info(sd, (struct __kernel_old_timeval *)arg);
break;
default:
ret = -ENOIOCTLCMD;
break;
}
return ret;
}
#ifdef CONFIG_COMPAT
#define RK_VIDIOC_COMPAT_FLASH_TIMEINFO \
_IOR('V', BASE_VIDIOC_PRIVATE + 0, struct old_timeval32)
static long aw36518_compat_ioctl32(struct v4l2_subdev *sd,
unsigned int cmd,
unsigned long arg)
{
void __user *up = compat_ptr(arg);
struct old_timeval32 *compat_t;
long ret;
struct __kernel_old_timeval t;
switch (cmd) {
case RK_VIDIOC_COMPAT_FLASH_TIMEINFO:
compat_t = kzalloc(sizeof(*compat_t), GFP_KERNEL);
if (!compat_t) {
ret = -ENOMEM;
return ret;
}
ret = aw36518_ioctl(sd, RK_VIDIOC_FLASH_TIMEINFO, &t);
if (!ret) {
compat_t->tv_sec = t.tv_sec;
compat_t->tv_usec = t.tv_usec;
ret = copy_to_user(up, compat_t, sizeof(*compat_t));
if (ret)
ret = -EFAULT;
}
kfree(compat_t);
break;
default:
ret = -ENOIOCTLCMD;
break;
}
return ret;
}
#endif
static int aw36518_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
int rval;
rval = pm_runtime_get_sync(sd->dev);
if (rval < 0) {
pm_runtime_put_noidle(sd->dev);
return rval;
}
return 0;
}
static int aw36518_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
pm_runtime_put(sd->dev);
return 0;
}
static int aw36518_s_power(struct v4l2_subdev *sd, int on)
{
struct aw36518_led *led = to_led(sd);
struct aw36518_flash *flash =
container_of(led, struct aw36518_flash, leds[0]);
int ret = 0;
struct i2c_client *client = flash->client;
dev_info(&client->dev, "%s on(%d)\n", __func__, on);
mutex_lock(&flash->lock);
/* If the power state is not modified - no work to do. */
if (flash->power_on == !!on)
goto unlock_and_return;
if (on) {
ret = pm_runtime_get_sync(&client->dev);
if (ret < 0) {
pm_runtime_put_noidle(&client->dev);
goto unlock_and_return;
}
flash->power_on = true;
} else {
pm_runtime_put(&client->dev);
flash->power_on = false;
}
unlock_and_return:
mutex_unlock(&flash->lock);
return ret;
}
static const struct v4l2_subdev_core_ops aw36518_core_ops = {
.s_power = aw36518_s_power,
.ioctl = aw36518_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl32 = aw36518_compat_ioctl32
#endif
};
static const struct v4l2_subdev_ops aw36518_ops = {
.core = &aw36518_core_ops,
};
static const struct v4l2_subdev_internal_ops aw36518_internal_ops = {
.open = aw36518_open,
.close = aw36518_close,
};
static int __aw36518_set_power(struct aw36518_flash *flash, bool on)
{
gpiod_direction_output(flash->en_gpio, on);
return 0;
}
static int aw36518_check_id(struct aw36518_flash *flash)
{
int ret = 0;
__aw36518_set_power(flash, true);
ret = aw36518_i2c_read(flash, AW36518_REG_ID);
if (ret != AW36518_ID) {
dev_err(&flash->client->dev,
"Read chip id error\n");
return -ENODEV;
}
dev_info(&flash->client->dev,
"Detected aw36518 flash id:0x%x\n", ret);
return 0;
}
static int aw36518_of_init(struct i2c_client *client,
struct aw36518_flash *flash)
{
struct device_node *node = client->dev.of_node;
struct device_node *child;
struct aw36518_led *led;
int ret = 0;
if (!node) {
dev_err(&client->dev,
"get device node failed\n");
goto err;
}
ret = of_property_read_u32(node,
RKMODULE_CAMERA_MODULE_INDEX,
&flash->module_index);
ret |= of_property_read_string(node,
RKMODULE_CAMERA_MODULE_FACING,
&flash->module_facing);
if (ret) {
dev_err(&client->dev,
"could not get module information!\n");
goto err;
}
flash->en_gpio = devm_gpiod_get(&client->dev,
"enable", GPIOD_OUT_LOW);
if (IS_ERR(flash->en_gpio)) {
flash->en_gpio = NULL;
dev_warn(&client->dev,
"get enable-gpio failed, using assist light mode\n");
}
flash->torch_gpio = devm_gpiod_get(&client->dev,
"torch", GPIOD_OUT_LOW);
if (IS_ERR(flash->torch_gpio)) {
flash->torch_gpio = NULL;
dev_warn(&client->dev,
"get torch-gpio failed, using assist light mode\n");
}
flash->strobe_gpio = devm_gpiod_get(&client->dev,
"strobe", GPIOD_OUT_LOW);
if (IS_ERR(flash->strobe_gpio)) {
flash->strobe_gpio = NULL;
dev_warn(&client->dev,
"get strobe-gpio failed, using assist light mode\n");
}
flash->tx_gpio = devm_gpiod_get(&client->dev,
"tx", GPIOD_OUT_LOW);
if (IS_ERR(flash->tx_gpio)) {
flash->tx_gpio = NULL;
dev_warn(&client->dev,
"get tx-gpio failed, using assist light mode\n");
}
for_each_child_of_node(node, child) {
u32 id = 0;
of_property_read_u32(child, "reg", &id);
if (id >= LED_MAX) {
dev_err(&client->dev, "only support 2 leds\n");
goto err;
}
led = &flash->leds[id];
led->sd.fwnode = of_fwnode_handle(child);
if (of_property_read_u32(child, "flash-max-timeout-us",
&led->max_flash_timeout)) {
dev_err(&client->dev,
"get led%d flash-max-timeout-us fail\n", id);
goto err;
}
if (led->max_flash_timeout > TIMEOUT_MAX)
led->max_flash_timeout = TIMEOUT_MAX;
if (of_property_read_u32(child, "flash-max-microamp",
&led->max_flash_intensity)) {
dev_err(&client->dev,
"get led%d flash-max-microamp fail\n", id);
goto err;
}
if (led->max_flash_intensity > AW36518_MAX_FLASH_INTENSITY)
led->max_flash_intensity = AW36518_MAX_FLASH_INTENSITY;
if (of_property_read_u32(child, "led-max-microamp",
&led->max_torch_intensity)) {
dev_err(&client->dev,
"get led%d led-max-microamp fail\n", id);
goto err;
}
if (led->max_torch_intensity > AW36518_MAX_TORCH_INTENSITY)
led->max_torch_intensity = AW36518_MAX_TORCH_INTENSITY;
v4l2_dbg(1, debug, &led->sd,
"led%d max torch:%dUA flash:%dUA timeout:%dUS\n",
id, led->max_torch_intensity,
led->max_flash_intensity,
led->max_flash_timeout);
}
return 0;
err:
return -EINVAL;
}
static int aw36518_init_device(struct aw36518_flash *flash)
{
int ret;
unsigned int reg_val;
struct i2c_client *client = flash->client;
/* output disable */
flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
ret = aw36518_set_mode(flash, 0, 0);
if (ret < 0)
return ret;
/* reset faults */
reg_val = aw36518_i2c_read(flash, AW36518_REG_FAULT);
dev_info(&client->dev, "%s: fault: 0x%x.\n", __func__, reg_val);
/* tx input default low */
if (flash->tx_gpio)
gpiod_direction_output(flash->tx_gpio, 0);
/* STROBE/Torch input default low */
if (flash->torch_gpio)
gpiod_set_value_cansleep(flash->torch_gpio, 0);
return ret;
}
static int aw36518_probe(struct i2c_client *client,
const struct i2c_device_id *devid)
{
struct aw36518_flash *flash;
struct v4l2_subdev *sd;
char facing[2];
int i, ret;
dev_info(&client->dev, "driver version: %02x.%02x.%02x",
DRIVER_VERSION >> 16,
(DRIVER_VERSION & 0xff00) >> 8,
DRIVER_VERSION & 0x00ff);
flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
if (!flash)
return -ENOMEM;
flash->client = client;
ret = aw36518_of_init(client, flash);
if (ret)
return ret;
ret = aw36518_check_id(flash);
if (ret)
goto err_power_off;
for (i = 0; i < LED_MAX; i++) {
sd = &flash->leds[i].sd;
v4l2_i2c_subdev_init(sd, client, &aw36518_ops);
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
sd->internal_ops = &aw36518_internal_ops;
memset(facing, 0, sizeof(facing));
if (strcmp(flash->module_facing, "back") == 0)
facing[0] = 'b';
else
facing[0] = 'f';
/* NOTE: to distinguish between two led
* name: led0 meet the main led
* name: led1 meet the secondary led
*/
snprintf(sd->name, sizeof(sd->name),
"m%02d_%s_%s_led%d %s",
flash->module_index, facing,
AW36518_NAME, i, dev_name(sd->dev));
ret = aw36518_init_controls(flash, i);
if (ret)
goto err;
ret = media_entity_pads_init(&sd->entity, 0, NULL);
if (ret < 0)
goto free_ctl;
sd->entity.function = MEDIA_ENT_F_FLASH;
ret = v4l2_async_register_subdev(sd);
if (ret)
goto free_media;
}
ret = aw36518_init_device(flash);
if (ret < 0)
goto free_media;
i2c_set_clientdata(client, flash);
mutex_init(&flash->lock);
pm_runtime_set_active(&client->dev);
pm_runtime_enable(&client->dev);
pm_runtime_idle(&client->dev);
dev_info(&client->dev, "probing successful\n");
return 0;
free_media:
media_entity_cleanup(&flash->leds[i].sd.entity);
free_ctl:
v4l2_ctrl_handler_free(&flash->leds[i].ctrls);
err:
for (--i; i >= 0; --i) {
v4l2_device_unregister_subdev(&flash->leds[i].sd);
media_entity_cleanup(&flash->leds[i].sd.entity);
v4l2_ctrl_handler_free(&flash->leds[i].ctrls);
}
err_power_off:
__aw36518_set_power(flash, false);
return ret;
}
static void aw36518_remove(struct i2c_client *client)
{
struct aw36518_flash *flash = i2c_get_clientdata(client);
unsigned int i;
pm_runtime_disable(&client->dev);
for (i = 0; i < LED_MAX; i++) {
v4l2_device_unregister_subdev(&flash->leds[i].sd);
v4l2_ctrl_handler_free(&flash->leds[i].ctrls);
media_entity_cleanup(&flash->leds[i].sd.entity);
}
mutex_destroy(&flash->lock);
}
static int __maybe_unused aw36518_runtime_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct aw36518_flash *flash = i2c_get_clientdata(client);
return __aw36518_set_power(flash, false);
}
static int __maybe_unused aw36518_runtime_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct aw36518_flash *flash = i2c_get_clientdata(client);
return __aw36518_set_power(flash, true);
}
static const struct i2c_device_id aw36518_id_table[] = {
{ AW36518_NAME, 0 },
{ { 0 } }
};
MODULE_DEVICE_TABLE(i2c, aw36518_id_table);
static const struct of_device_id aw36518_of_table[] = {
{ .compatible = "awinic,aw36518" },
{ { 0 } }
};
static const struct dev_pm_ops aw36518_pm_ops = {
SET_RUNTIME_PM_OPS(aw36518_runtime_suspend,
aw36518_runtime_resume, NULL)
};
static struct i2c_driver aw36518_i2c_driver = {
.driver = {
.name = AW36518_NAME,
.pm = &aw36518_pm_ops,
.of_match_table = aw36518_of_table,
},
.probe = aw36518_probe,
.remove = aw36518_remove,
.id_table = aw36518_id_table,
};
module_i2c_driver(aw36518_i2c_driver);
MODULE_DESCRIPTION("AW36518 LED flash driver");
MODULE_LICENSE("GPL");
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