MTK camera flashlight bring up

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• MTK camera flashlight bring up
  • 一查看硬件原理圖
    • front camera
    • rear camera
    • key note
  • 二kernel層
    • front camera 添加驅動文件
    • rear camera 添加驅動文件
  • 二hal層
    • front camera 打開flashlight宏控制

一、查看硬件原理圖：

1.front camera：

2.rear camera：

3.key note：

(1)注意第一個前攝flashlight：default is powered by ISINK。這里走的是PMIC，沒有使用GPIO。
(2)第二個后攝flashlight使用的是GPIO控制。

二、kernel層：

1.front camera 添加驅動文件：

file path：alps/kernel-3.18/drivers/misc/mediatek/flashlight/src/mt6580/sub_strobe.c

example：

/** Copyright (C) 2015 MediaTek Inc.** 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.** This program is distributed in the hope that it will be useful,* but WITHOUT ANY WARRANTY; without even the implied warranty of* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the* GNU General Public License for more details.*/#include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/wait.h> #include <linux/slab.h> #include <linux/fs.h> #include <linux/sched.h> #include <linux/poll.h> #include <linux/device.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/cdev.h> #include <linux/errno.h> #include <linux/time.h> #include <asm/io.h> #include <asm/uaccess.h> #include "kd_camera_typedef.h" #include <linux/hrtimer.h> #include <linux/ktime.h> #include <linux/version.h> #include <mt-plat/mt_gpio.h> #ifdef CONFIG_COMPAT #include <linux/fs.h> #include <linux/compat.h> #endif #include "kd_flashlight.h" /******************************************************************************* Debug configuration ******************************************************************************/ /* availible parameter */ /* ANDROID_LOG_ASSERT */ /* ANDROID_LOG_ERROR */ /* ANDROID_LOG_WARNING */ /* ANDROID_LOG_INFO */ /* ANDROID_LOG_DEBUG */ /* ANDROID_LOG_VERBOSE */ #define TAG_NAME "[sub_strobe.c]" #define PK_DBG_NONE(fmt, arg...) do {} while (0) #define PK_DBG_FUNC(fmt, arg...) pr_debug(TAG_NAME "%s: " fmt, __func__ , ##arg) #define PK_WARN(fmt, arg...) pr_warn(TAG_NAME "%s: " fmt, __func__ , ##arg) #define PK_NOTICE(fmt, arg...) pr_notice(TAG_NAME "%s: " fmt, __func__ , ##arg) #define PK_INFO(fmt, arg...) pr_info(TAG_NAME "%s: " fmt, __func__ , ##arg) #define PK_TRC_FUNC(f) pr_debug(TAG_NAME "<%s>\n", __func__) #define PK_TRC_VERBOSE(fmt, arg...) pr_debug(TAG_NAME fmt, ##arg) #define PK_ERROR(fmt, arg...) pr_err(TAG_NAME "%s: " fmt, __func__ , ##arg)#define DEBUG_LEDS_STROBE #ifdef DEBUG_LEDS_STROBE #define PK_DBG PK_DBG_FUNC #define PK_VER PK_TRC_VERBOSE #define PK_ERR PK_ERROR #else #define PK_DBG(a, ...) #define PK_VER(a, ...) #define PK_ERR(a, ...) #endif#define CONFIG_FLASHLIGHT_EN_BY_ISINK #if defined (CONFIG_FLASHLIGHT_EN_BY_ISINK) #include <upmu_common.h> enum{C_ISINK_0 = 0, //4mAC_ISINK_1 = 1, //8mAC_ISINK_2 = 2, //12mAC_ISINK_3 = 3, //16mAC_ISINK_4 = 4, //20mAC_ISINK_5 = 5 //24mA }; enum{C_PMIC_PWM_0 = 0,C_PMIC_PWM_1 = 1,C_PMIC_PWM_2 = 2 };enum{//32K clockC_ISINK_1KHZ = 0,C_ISINK_200HZ = 4,C_ISINK_5HZ = 199,C_ISINK_2HZ = 499,C_ISINK_1HZ = 999,C_ISINK_05HZ = 1999,C_ISINK_02HZ = 4999,C_ISINK_01HZ = 9999,//2M clockC_ISINK_2M_20KHZ = 2,C_ISINK_2M_1KHZ = 61,C_ISINK_2M_200HZ = 311,C_ISINK_2M_5HZ = 12499,C_ISINK_2M_2HZ = 31249,C_ISINK_2M_1HZ = 62499 };#define C_NLED_OFF 0 #define C_NLED_ON 1 #endifstatic DEFINE_SPINLOCK(g_sub_strobeSMPLock); /* cotta-- SMP proection */static u32 strobe_Res; static u32 strobe_Timeus; static BOOL g_strobe_On;static int g_duty = -1; static int g_timeOutTimeMs;static struct work_struct workTimeOut;static int FL_Enable(void) { #if defined (CONFIG_FLASHLIGHT_EN_BY_ISINK) //internal FL and extennal FL add by zhaoliangming 20160429pmic_set_register_value(PMIC_ISINK_CH1_EN,C_NLED_ON); // Turn on ISINK Channel 1pmic_set_register_value(PMIC_ISINK_CH2_EN,C_NLED_ON); // Turn on ISINK Channel 2pmic_set_register_value(PMIC_ISINK_CH3_EN,C_NLED_ON); // Turn on ISINK Channel 3 #endifreturn 0; }static int FL_Disable(void) { #if defined (CONFIG_FLASHLIGHT_EN_BY_ISINK) //internal FL and external FL add by zhaoliangming 20160429pmic_set_register_value(PMIC_ISINK_CH1_EN,C_NLED_OFF); // Turn off ISINK Channel 1pmic_set_register_value(PMIC_ISINK_CH2_EN,C_NLED_OFF); // Turn off ISINK Channel 2pmic_set_register_value(PMIC_ISINK_CH3_EN,C_NLED_OFF); // Turn off ISINK Channel 3 #endifreturn 0; }static int FL_dim_duty(kal_uint32 duty) {PK_DBG(" FL_dim_duty line=%d\n", __LINE__);g_duty = duty;if(duty <32 ){pmic_set_register_value(PMIC_ISINK_DIM1_DUTY,duty);pmic_set_register_value(PMIC_ISINK_DIM2_DUTY,duty);pmic_set_register_value(PMIC_ISINK_DIM3_DUTY,duty);}return 0; }static int FL_Init(void) { #if defined (CONFIG_FLASHLIGHT_EN_BY_ISINK)pmic_set_register_value(PMIC_RG_DRV_32K_CK_PDN,0x0); // Disable power downpmic_set_register_value(PMIC_RG_ISINK1_CK_PDN,0);pmic_set_register_value(PMIC_RG_ISINK1_CK_SEL,0);pmic_set_register_value(PMIC_ISINK_CH1_MODE,C_PMIC_PWM_2);//register modepmic_set_register_value(PMIC_ISINK_CH1_STEP,C_ISINK_5);//24mApmic_set_register_value(PMIC_ISINK_DIM1_DUTY,31);pmic_set_register_value(PMIC_ISINK_DIM1_FSEL,C_ISINK_1KHZ);//1KHzpmic_set_register_value(PMIC_RG_ISINK1_DOUBLE_EN,0x1); // Enable double currentpmic_set_register_value(PMIC_RG_DRV_32K_CK_PDN,0x0); // Disable power downpmic_set_register_value(PMIC_RG_ISINK2_CK_PDN,0);pmic_set_register_value(PMIC_RG_ISINK2_CK_SEL,0);pmic_set_register_value(PMIC_ISINK_CH2_MODE,C_PMIC_PWM_2);//register modepmic_set_register_value(PMIC_ISINK_CH2_STEP,C_ISINK_5);//24mApmic_set_register_value(PMIC_ISINK_DIM2_DUTY,31);pmic_set_register_value(PMIC_ISINK_DIM2_FSEL,C_ISINK_1KHZ);//1KHzpmic_set_register_value(PMIC_RG_ISINK2_DOUBLE_EN,0x1); // Enable double currentpmic_set_register_value(PMIC_RG_DRV_32K_CK_PDN,0x0); // Disable power downpmic_set_register_value(PMIC_RG_ISINK3_CK_PDN,0);pmic_set_register_value(PMIC_RG_ISINK3_CK_SEL,0);pmic_set_register_value(PMIC_ISINK_CH3_MODE,C_PMIC_PWM_2);//register modepmic_set_register_value(PMIC_ISINK_CH3_STEP,C_ISINK_5);//24mApmic_set_register_value(PMIC_ISINK_DIM3_DUTY,31);pmic_set_register_value(PMIC_ISINK_DIM3_FSEL,C_ISINK_1KHZ);//1KHzpmic_set_register_value(PMIC_RG_ISINK3_DOUBLE_EN,0x1); // Enable double current #endifreturn 0; }static int FL_Uninit(void) {return 0; }/***************************************************************************** User interface *****************************************************************************/static void work_timeOutFunc(struct work_struct *data) {FL_Disable();PK_DBG("ledTimeOut_callback\n"); }static enum hrtimer_restart ledTimeOutCallback(struct hrtimer *timer) {schedule_work(&workTimeOut);return HRTIMER_NORESTART; }static struct hrtimer g_timeOutTimer; static void timerInit(void) {static int init_flag;if (init_flag == 0) {init_flag = 1;INIT_WORK(&workTimeOut, work_timeOutFunc);g_timeOutTimeMs = 1000;hrtimer_init(&g_timeOutTimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);g_timeOutTimer.function = ledTimeOutCallback;} }static int sub_strobe_ioctl(unsigned int cmd, unsigned long arg) {int i4RetValue = 0;int ior_shift;int iow_shift;int iowr_shift;ior_shift = cmd - (_IOR(FLASHLIGHT_MAGIC, 0, int));iow_shift = cmd - (_IOW(FLASHLIGHT_MAGIC, 0, int));iowr_shift = cmd - (_IOWR(FLASHLIGHT_MAGIC, 0, int));printk(KERN_ERR "koson!!!!! %s:%d cmd=%d arg=%ld\n", __func__, __LINE__, cmd, arg);/* PK_DBG("LM3642 constant_flashlight_ioctl() line=%d ior_shift=%d, iow_shift=%d iowr_shift=%d arg=%d\n",__LINE__, ior_shift, iow_shift, iowr_shift, (int)arg); */switch (cmd) {case FLASH_IOC_SET_TIME_OUT_TIME_MS:PK_DBG("FLASH_IOC_SET_TIME_OUT_TIME_MS: %d\n", (int)arg);g_timeOutTimeMs = arg;break;case FLASH_IOC_SET_DUTY:PK_DBG("FLASHLIGHT_DUTY: %d\n", (int)arg);FL_dim_duty(arg);break;case FLASH_IOC_SET_STEP:PK_DBG("FLASH_IOC_SET_STEP: %d\n", (int)arg);break;case FLASH_IOC_SET_ONOFF:PK_DBG("FLASHLIGHT_ONOFF: %d\n", (int)arg);if (arg == 1) {int s;int ms;if (g_timeOutTimeMs > 1000) {s = g_timeOutTimeMs / 1000;ms = g_timeOutTimeMs - s * 1000;} else {s = 0;ms = g_timeOutTimeMs;}if (g_timeOutTimeMs != 0) {ktime_t ktime;ktime = ktime_set(s, ms * 1000000);hrtimer_start(&g_timeOutTimer, ktime, HRTIMER_MODE_REL);}FL_Enable();} else {FL_Disable();hrtimer_cancel(&g_timeOutTimer);}break;default:PK_DBG(" No such command\n");i4RetValue = -EPERM;break;}return i4RetValue; }static int sub_strobe_open(void *pArg) {int i4RetValue = 0;PK_DBG("constant_flashlight_open line=%d\n", __LINE__);if (0 == strobe_Res) {FL_Init();timerInit();}PK_DBG("constant_flashlight_open line=%d\n", __LINE__);spin_lock_irq(&g_sub_strobeSMPLock);if (strobe_Res) {PK_DBG(" busy!\n");i4RetValue = -EBUSY;} else {strobe_Res += 1;}spin_unlock_irq(&g_sub_strobeSMPLock);PK_DBG("constant_flashlight_open line=%d\n", __LINE__);return i4RetValue; }static int sub_strobe_release(void *pArg) {PK_DBG(" constant_flashlight_release\n");if (strobe_Res) {spin_lock_irq(&g_sub_strobeSMPLock);strobe_Res = 0;strobe_Timeus = 0;/* LED On Status */g_strobe_On = FALSE;spin_unlock_irq(&g_sub_strobeSMPLock);FL_Uninit();}PK_DBG(" Done\n");return 0; }FLASHLIGHT_FUNCTION_STRUCT subStrobeFunc = {sub_strobe_open,sub_strobe_release,sub_strobe_ioctl };MUINT32 subStrobeInit(PFLASHLIGHT_FUNCTION_STRUCT *pfFunc) {if (pfFunc != NULL)*pfFunc = &subStrobeFunc;return 0; }

key note：此處前攝是PMU ISINK控制，雖然原理圖上標號為ISINK1，但是它是由ISINK1，2，3組合而成的。

2.rear camera 添加驅動文件：

file path：alps/kernel-3.18/drivers/misc/mediatek/flashlight/src/mt6580/constant_flashlight/leds_strobe.c

example：

/** Copyright (C) 2015 MediaTek Inc.** 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.** This program is distributed in the hope that it will be useful,* but WITHOUT ANY WARRANTY; without even the implied warranty of* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the* GNU General Public License for more details.*/#include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/wait.h> #include <linux/slab.h> #include <linux/fs.h> #include <linux/sched.h> #include <linux/poll.h> #include <linux/device.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/cdev.h> #include <linux/errno.h> #include <linux/time.h> #include <linux/gpio.h> #include "kd_flashlight.h" #include <asm/io.h> #include <asm/uaccess.h> #include <mt-plat/mt_gpio.h> #include "kd_camera_typedef.h" #include <linux/hrtimer.h> #include <linux/ktime.h> #include <linux/version.h> #include <linux/mutex.h> #include <linux/i2c.h> #include <linux/leds.h> #include <mt-plat/mt_pwm.h>#include "../../../../imgsensor/src/mt6580/camera_hw/kd_camera_hw.h"#define GPIO8 8/******************************************************************************* Debug configuration ******************************************************************************/ /* availible parameter */ /* ANDROID_LOG_ASSERT */ /* ANDROID_LOG_ERROR */ /* ANDROID_LOG_WARNING */ /* ANDROID_LOG_INFO */ /* ANDROID_LOG_DEBUG */ /* ANDROID_LOG_VERBOSE */#define TAG_NAME "[leds_strobe.c]" #define PK_DBG_NONE(fmt, arg...) do {} while (0) #define PK_DBG_FUNC(fmt, arg...) pr_debug(TAG_NAME "%s: " fmt, __func__ , ##arg)/*#define DEBUG_LEDS_STROBE*/ #ifdef DEBUG_LEDS_STROBE #define PK_DBG PK_DBG_FUNC #else #define PK_DBG(a, ...) #endif/******************************************************************************* local variables ******************************************************************************/static DEFINE_SPINLOCK(g_strobeSMPLock); /* cotta-- SMP proection */static u32 strobe_Res; static u32 strobe_Timeus; static BOOL g_strobe_On;static int g_duty = -1; static int g_timeOutTimeMs;static DEFINE_MUTEX(g_strobeSem);#define STROBE_DEVICE_ID 0xC6static struct work_struct workTimeOut;/* #define FLASH_GPIO_ENF GPIO12 */ /* #define FLASH_GPIO_ENT GPIO13 *///static int g_bLtVersion;static struct pwm_spec_config pwm_setting;/***************************************************************************** Functions *****************************************************************************/ static void work_timeOutFunc(struct work_struct *data);int FL_Enable(void) {pwm_set_spec_config(&pwm_setting);return 0; }int FL_Disable(void) {mt_pwm_disable(PWM1,0);return 0; }int FL_dim_duty(kal_uint32 duty) {PK_DBG(" FL_dim_duty line=%d\n", __LINE__);g_duty = duty;if(duty == 0)pwm_setting.PWM_MODE_OLD_REGS.THRESH = 16;else if (duty == 1)pwm_setting.PWM_MODE_OLD_REGS.THRESH = 8;else if (duty > 16)pwm_setting.PWM_MODE_OLD_REGS.THRESH = 16;elsepwm_setting.PWM_MODE_OLD_REGS.THRESH = duty;return 0; }int FL_Init(void) {mt_set_gpio_mode(GPIO8, GPIO_MODE_02);pwm_setting.pwm_no = PWM1;pwm_setting.pmic_pad = 0; #ifdef PWM_FIFO_1pwm_setting.mode = PWM_MODE_FIFO;pwm_setting.clk_div=CLK_DIV1;pwm_setting.clk_src = PWM_CLK_NEW_MODE_BLOCK_DIV_BY_1625;pwm_setting.PWM_MODE_FIFO_REGS.IDLE_VALUE = 0;pwm_setting.PWM_MODE_FIFO_REGS.GUARD_VALUE = 0;pwm_setting.PWM_MODE_FIFO_REGS.STOP_BITPOS_VALUE = 31;pwm_setting.PWM_MODE_FIFO_REGS.HDURATION = 4;pwm_setting.PWM_MODE_FIFO_REGS.LDURATION = 4;pwm_setting.PWM_MODE_FIFO_REGS.GDURATION =(pwm_setting.PWM_MODE_FIFO_REGS.HDURATION + 1) * 32 - 1;pwm_setting.PWM_MODE_FIFO_REGS.GUARD_VALUE = 1;pwm_setting.PWM_MODE_FIFO_REGS.SEND_DATA0 =50;pwm_setting.PWM_MODE_FIFO_REGS.WAVE_NUM = 0; #elsepwm_setting.mode = PWM_MODE_OLD;pwm_setting.clk_div=CLK_DIV1;pwm_setting.clk_src = PWM_CLK_OLD_MODE_BLOCK;pwm_setting.PWM_MODE_OLD_REGS.IDLE_VALUE = 0;pwm_setting.PWM_MODE_OLD_REGS.GUARD_VALUE = 0;pwm_setting.PWM_MODE_OLD_REGS.GDURATION = 0;pwm_setting.PWM_MODE_OLD_REGS.WAVE_NUM = 0;pwm_setting.PWM_MODE_OLD_REGS.DATA_WIDTH = 16;pwm_setting.PWM_MODE_OLD_REGS.THRESH = 8; #endif/* PK_DBG(" FL_Init line=%d\n", __LINE__); */return 0; }int FL_Uninit(void) {FL_Disable();return 0; }/***************************************************************************** User interface *****************************************************************************/static void work_timeOutFunc(struct work_struct *data) {FL_Disable();PK_DBG("ledTimeOut_callback\n"); }enum hrtimer_restart ledTimeOutCallback(struct hrtimer *timer) {schedule_work(&workTimeOut);return HRTIMER_NORESTART; }static struct hrtimer g_timeOutTimer; void timerInit(void) {static int init_flag;if (init_flag == 0) {init_flag = 1;INIT_WORK(&workTimeOut, work_timeOutFunc);g_timeOutTimeMs = 1000;hrtimer_init(&g_timeOutTimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);g_timeOutTimer.function = ledTimeOutCallback;} }static int constant_flashlight_ioctl(unsigned int cmd, unsigned long arg) {int i4RetValue = 0;int ior_shift;int iow_shift;int iowr_shift;ior_shift = cmd - (_IOR(FLASHLIGHT_MAGIC, 0, int));iow_shift = cmd - (_IOW(FLASHLIGHT_MAGIC, 0, int));iowr_shift = cmd - (_IOWR(FLASHLIGHT_MAGIC, 0, int));switch (cmd) {case FLASH_IOC_SET_TIME_OUT_TIME_MS:PK_DBG("FLASH_IOC_SET_TIME_OUT_TIME_MS: %d\n", (int)arg);g_timeOutTimeMs = arg;break;case FLASH_IOC_SET_DUTY:PK_DBG("FLASHLIGHT_DUTY: %d\n", (int)arg);FL_dim_duty(arg);break;case FLASH_IOC_SET_STEP:PK_DBG("FLASH_IOC_SET_STEP: %d\n", (int)arg);break;case FLASH_IOC_SET_ONOFF:PK_DBG("FLASHLIGHT_ONOFF: %d\n", (int)arg);if (arg == 1) {int s;int ms;if (g_timeOutTimeMs > 1000) {s = g_timeOutTimeMs / 1000;ms = g_timeOutTimeMs - s * 1000;} else {s = 0;ms = g_timeOutTimeMs;}if (g_timeOutTimeMs != 0) {ktime_t ktime;ktime = ktime_set(s, ms * 1000000);hrtimer_start(&g_timeOutTimer, ktime, HRTIMER_MODE_REL);}FL_Enable();} else {FL_Disable();hrtimer_cancel(&g_timeOutTimer);}break;default:PK_DBG(" No such command\n");i4RetValue = -EPERM;break;}return i4RetValue; }static int constant_flashlight_open(void *pArg) {int i4RetValue = 0;PK_DBG("constant_flashlight_open line=%d\n", __LINE__);if (0 == strobe_Res) {FL_Init();timerInit();}PK_DBG("constant_flashlight_open line=%d\n", __LINE__);spin_lock_irq(&g_strobeSMPLock);if (strobe_Res) {PK_DBG(" busy!\n");i4RetValue = -EBUSY;} else {strobe_Res += 1;}spin_unlock_irq(&g_strobeSMPLock);PK_DBG("constant_flashlight_open line=%d\n", __LINE__);return i4RetValue;}static int constant_flashlight_release(void *pArg) {PK_DBG(" constant_flashlight_release\n");if (strobe_Res) {spin_lock_irq(&g_strobeSMPLock);strobe_Res = 0;strobe_Timeus = 0;/* LED On Status */g_strobe_On = FALSE;spin_unlock_irq(&g_strobeSMPLock);FL_Uninit();}PK_DBG(" Done\n");return 0;}FLASHLIGHT_FUNCTION_STRUCT constantFlashlightFunc = {constant_flashlight_open,constant_flashlight_release,constant_flashlight_ioctl };MUINT32 constantFlashlightInit(PFLASHLIGHT_FUNCTION_STRUCT *pfFunc) {if (pfFunc != NULL)*pfFunc = &constantFlashlightFunc;return 0; }/* LED flash control for high current capture mode*/ ssize_t strobe_VDIrq(void) {return 0; } EXPORT_SYMBOL(strobe_VDIrq);

二、hal層：

1.front camera 打開flashlight宏控制：

file path：alps/vendor/mediatek/proprietary/custom/mt6580/hal/flashlight/flash_tuning_custom2.h

example：

#define SUB_FLASH_SUPPORT 1

總結

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