DW9718AF.c

/*
 * 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.
 */

/*
 * DW9718AF voice coil motor driver
 *
 *
 */

#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/i2c.h>
#include <linux/uaccess.h>

#include "lens_info.h"

#define AF_DRVNAME "DW9718AF_DRV"
#define AF_I2C_SLAVE_ADDR 0x18

#define AF_DEBUG
#ifdef AF_DEBUG
#define LOG_INF(format, args...)                                               \
	pr_debug(AF_DRVNAME " [%s] " format, __func__, ##args)
#else
#define LOG_INF(format, args...)
#endif

static struct i2c_client *g_pstAF_I2Cclient;
static int *g_pAF_Opened;
static spinlock_t *g_pAF_SpinLock;

static unsigned long g_u4AF_INF;
static unsigned long g_u4AF_MACRO = 1023;
static unsigned long g_u4CurrPosition;

#if 0
static int i2c_read(u8 a_u2Addr, u8 *a_puBuff)
{
	int i4RetValue = 0;
	char puReadCmd[1] = {(char)(a_u2Addr)};

	i4RetValue = i2c_master_send(g_pstAF_I2Cclient, puReadCmd, 1);
	if (i4RetValue < 0) {
		LOG_INF(" I2C write failed!!\n");
		return -1;
	}

	i4RetValue = i2c_master_recv(g_pstAF_I2Cclient, (char *)a_puBuff, 1);
	if (i4RetValue < 0) {
		LOG_INF(" I2C read failed!!\n");
		return -1;
	}

	return 0;
}


static u8 read_data(u8 addr)
{
	u8 get_byte = 0xFF;

	i2c_read(addr, &get_byte);

	return get_byte;
}

static int s4DW9718AF_ReadReg(unsigned short *a_pu2Result)
{
	*a_pu2Result = (read_data(0x02) << 8) + (read_data(0x03) & 0xff);

	return 0;
}
#endif

static int s4AF_WriteReg(u16 a_u2Data)
{
	int i4RetValue = 0;

	char puSendCmd[3] = {0x02, (char)(a_u2Data >> 8),
			     (char)(a_u2Data & 0xFF)};

	g_pstAF_I2Cclient->addr = AF_I2C_SLAVE_ADDR;

	g_pstAF_I2Cclient->addr = g_pstAF_I2Cclient->addr >> 1;

	i4RetValue = i2c_master_send(g_pstAF_I2Cclient, puSendCmd, 3);

	if (i4RetValue < 0) {
		LOG_INF("I2C send failed!!\n");
		return -1;
	}

	return 0;
}

static inline int getAFInfo(__user struct stAF_MotorInfo *pstMotorInfo)
{
	struct stAF_MotorInfo stMotorInfo;

	stMotorInfo.u4MacroPosition = g_u4AF_MACRO;
	stMotorInfo.u4InfPosition = g_u4AF_INF;
	stMotorInfo.u4CurrentPosition = g_u4CurrPosition;
	stMotorInfo.bIsSupportSR = 1;

	stMotorInfo.bIsMotorMoving = 1;

	if (*g_pAF_Opened >= 1)
		stMotorInfo.bIsMotorOpen = 1;
	else
		stMotorInfo.bIsMotorOpen = 0;

	if (copy_to_user(pstMotorInfo, &stMotorInfo,
			 sizeof(struct stAF_MotorInfo)))
		LOG_INF("copy to user failed when getting motor information\n");

	return 0;
}

/* initAF include driver initialization and standby mode */
static int initAF(void)
{
	LOG_INF("+\n");

	if (*g_pAF_Opened == 1) {

		int i4RetValue = 0;
		char puSendCmd[2] = {0x00, 0x00}; /* soft power on */
		char puSendCmd2[2] = {0x01, 0x39};
		char puSendCmd3[2] = {0x05, 0x65};

		i4RetValue = i2c_master_send(g_pstAF_I2Cclient, puSendCmd, 2);

		if (i4RetValue < 0) {
			LOG_INF("I2C send 0x00 failed!!\n");
			return -1;
		}

		i4RetValue = i2c_master_send(g_pstAF_I2Cclient, puSendCmd2, 2);

		if (i4RetValue < 0) {
			LOG_INF("I2C send 0x01 failed!!\n");
			return -1;
		}

		i4RetValue = i2c_master_send(g_pstAF_I2Cclient, puSendCmd3, 2);

		if (i4RetValue < 0) {
			LOG_INF("I2C send 0x05 failed!!\n");
			return -1;
		}

		LOG_INF("driver init success!!\n");

		spin_lock(g_pAF_SpinLock);
		*g_pAF_Opened = 2;
		spin_unlock(g_pAF_SpinLock);
	}

	LOG_INF("-\n");

	return 0;
}

/* moveAF only use to control moving the motor */
static inline int moveAF(unsigned long a_u4Position)
{
	int ret = 0;

	if (s4AF_WriteReg((unsigned short)a_u4Position) == 0) {
		g_u4CurrPosition = a_u4Position;
		ret = 0;
	} else {
		LOG_INF("set I2C failed when moving the motor\n");
		ret = -1;
	}

	return ret;
}

static inline int setAFInf(unsigned long a_u4Position)
{
	spin_lock(g_pAF_SpinLock);
	g_u4AF_INF = a_u4Position;
	spin_unlock(g_pAF_SpinLock);
	return 0;
}

static inline int setAFMacro(unsigned long a_u4Position)
{
	spin_lock(g_pAF_SpinLock);
	g_u4AF_MACRO = a_u4Position;
	spin_unlock(g_pAF_SpinLock);
	return 0;
}

/* // */
long DW9718AF_Ioctl(struct file *a_pstFile, unsigned int a_u4Command,
		    unsigned long a_u4Param)
{
	long i4RetValue = 0;

	switch (a_u4Command) {
	case AFIOC_G_MOTORINFO:
		i4RetValue =
			getAFInfo((__user struct stAF_MotorInfo *)(a_u4Param));
		break;

	case AFIOC_T_MOVETO:
		i4RetValue = moveAF(a_u4Param);
		break;

	case AFIOC_T_SETINFPOS:
		i4RetValue = setAFInf(a_u4Param);
		break;

	case AFIOC_T_SETMACROPOS:
		i4RetValue = setAFMacro(a_u4Param);
		break;

	default:
		LOG_INF("No CMD\n");
		i4RetValue = -EPERM;
		break;
	}

	return i4RetValue;
}

/* Main jobs: */
/* 1.Deallocate anything that "open" allocated in private_data. */
/* 2.Shut down the device on last close. */
/* 3.Only called once on last time. */
/* Q1 : Try release multiple times. */
int DW9718AF_Release(struct inode *a_pstInode, struct file *a_pstFile)
{
	LOG_INF("Start\n");

	if (*g_pAF_Opened == 2) {
		int i4RetValue = 0;
		char puSendCmd[2] = {0x00, 0x01};

		LOG_INF("apply\n");

		i4RetValue = i2c_master_send(g_pstAF_I2Cclient, puSendCmd, 2);
	}

	if (*g_pAF_Opened) {
		LOG_INF("Free\n");

		spin_lock(g_pAF_SpinLock);
		*g_pAF_Opened = 0;
		spin_unlock(g_pAF_SpinLock);
	}

	LOG_INF("End\n");

	return 0;
}

int DW9718AF_SetI2Cclient(struct i2c_client *pstAF_I2Cclient,
			  spinlock_t *pAF_SpinLock, int *pAF_Opened)
{
	g_pstAF_I2Cclient = pstAF_I2Cclient;
	g_pAF_SpinLock = pAF_SpinLock;
	g_pAF_Opened = pAF_Opened;

	initAF();

	return 1;
}

int DW9718AF_GetFileName(unsigned char *pFileName)
{
	#if SUPPORT_GETTING_LENS_FOLDER_NAME
	char FilePath[256];
	char *FileString;

	sprintf(FilePath, "%s", __FILE__);
	FileString = strrchr(FilePath, '/');
	*FileString = '\0';
	FileString = (strrchr(FilePath, '/') + 1);
	strncpy(pFileName, FileString, AF_MOTOR_NAME);
	LOG_INF("FileName : %s\n", pFileName);
	#else
	pFileName[0] = '\0';
	#endif
	return 1;
}