/*
 * Copyright (C) 2008-2009 QUALCOMM Incorporated.
 */

#include <linux/delay.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include <linux/kernel.h>
#include <media/msm_camera.h>
#include <mach/gpio.h>
#include <mach/camera.h>
#include "mt9p012.h"

/*=============================================================
    SENSOR REGISTER DEFINES
==============================================================*/
#define MT9P012_REG_MODEL_ID         0x0000
#define MT9P012_MODEL_ID             0x2801
#define REG_GROUPED_PARAMETER_HOLD   0x0104
#define GROUPED_PARAMETER_HOLD       0x0100
#define GROUPED_PARAMETER_UPDATE     0x0000
#define REG_COARSE_INT_TIME          0x3012
#define REG_VT_PIX_CLK_DIV           0x0300
#define REG_VT_SYS_CLK_DIV           0x0302
#define REG_PRE_PLL_CLK_DIV          0x0304
#define REG_PLL_MULTIPLIER           0x0306
#define REG_OP_PIX_CLK_DIV           0x0308
#define REG_OP_SYS_CLK_DIV           0x030A
#define REG_SCALE_M                  0x0404
#define REG_FRAME_LENGTH_LINES       0x300A
#define REG_LINE_LENGTH_PCK          0x300C
#define REG_X_ADDR_START             0x3004
#define REG_Y_ADDR_START             0x3002
#define REG_X_ADDR_END               0x3008
#define REG_Y_ADDR_END               0x3006
#define REG_X_OUTPUT_SIZE            0x034C
#define REG_Y_OUTPUT_SIZE            0x034E
#define REG_FINE_INTEGRATION_TIME    0x3014
#define REG_ROW_SPEED                0x3016
#define MT9P012_REG_RESET_REGISTER   0x301A
#define MT9P012_RESET_REGISTER_PWON  0x10CC
#define MT9P012_RESET_REGISTER_PWOFF 0x10C8
#define REG_READ_MODE                0x3040
#define REG_GLOBAL_GAIN              0x305E
#define REG_TEST_PATTERN_MODE        0x3070

#define MT9P012_REV_7


enum mt9p012_test_mode {
	TEST_OFF,
	TEST_1,
	TEST_2,
	TEST_3
};

enum mt9p012_resolution {
	QTR_SIZE,
	FULL_SIZE,
	INVALID_SIZE
};

enum mt9p012_reg_update {
	/* Sensor egisters that need to be updated during initialization */
	REG_INIT,
	/* Sensor egisters that needs periodic I2C writes */
	UPDATE_PERIODIC,
	/* All the sensor Registers will be updated */
	UPDATE_ALL,
	/* Not valid update */
	UPDATE_INVALID
};

enum mt9p012_setting {
	RES_PREVIEW,
	RES_CAPTURE
};

/* actuator's Slave Address */
#define MT9P012_AF_I2C_ADDR   0x18

/* AF Total steps parameters */
#define MT9P012_STEPS_NEAR_TO_CLOSEST_INF  32
#define MT9P012_TOTAL_STEPS_NEAR_TO_FAR    32

#define MT9P012_MU5M0_PREVIEW_DUMMY_PIXELS 0
#define MT9P012_MU5M0_PREVIEW_DUMMY_LINES  0

/* Time in milisecs for waiting for the sensor to reset.*/
#define MT9P012_RESET_DELAY_MSECS   66

/* for 20 fps preview */
#define MT9P012_DEFAULT_CLOCK_RATE  24000000
#define MT9P012_DEFAULT_MAX_FPS     26 /* ???? */

struct mt9p012_work {
	struct work_struct work;
};
static struct mt9p012_work *mt9p012_sensorw;
static struct i2c_client *mt9p012_client;

struct mt9p012_ctrl {
	const struct msm_camera_sensor_info *sensordata;

	int sensormode;
	uint32_t fps_divider; /* init to 1 * 0x00000400 */
	uint32_t pict_fps_divider; /* init to 1 * 0x00000400 */

	uint16_t curr_lens_pos;
	uint16_t init_curr_lens_pos;
	uint16_t my_reg_gain;
	uint32_t my_reg_line_count;

	enum mt9p012_resolution prev_res;
	enum mt9p012_resolution pict_res;
	enum mt9p012_resolution curr_res;
	enum mt9p012_test_mode  set_test;
};


static struct mt9p012_ctrl *mt9p012_ctrl;
static DECLARE_WAIT_QUEUE_HEAD(mt9p012_wait_queue);
DECLARE_MUTEX(mt9p012_sem);

/*=============================================================
	EXTERNAL DECLARATIONS
==============================================================*/
extern struct mt9p012_reg mt9p012_regs;	/* from mt9p012_reg.c */


/*=============================================================*/

static int mt9p012_i2c_rxdata(unsigned short saddr, unsigned char *rxdata,
	int length)
{
	struct i2c_msg msgs[] = {
		{
			.addr   = saddr,
			.flags = 0,
			.len   = 2,
			.buf   = rxdata,
		},
		{
			.addr   = saddr,
			.flags = I2C_M_RD,
			.len   = length,
			.buf   = rxdata,
		},
	};

	if (i2c_transfer(mt9p012_client->adapter, msgs, 2) < 0) {
		CDBG("mt9p012_i2c_rxdata failed!\n");
		return -EIO;
	}

	return 0;
}

static int32_t mt9p012_i2c_read_w(unsigned short saddr, unsigned short raddr,
	unsigned short *rdata)
{
	int32_t rc = 0;
	unsigned char buf[4];

	if (!rdata)
		return -EIO;

	memset(buf, 0, sizeof(buf));

	buf[0] = (raddr & 0xFF00)>>8;
	buf[1] = (raddr & 0x00FF);

	rc = mt9p012_i2c_rxdata(saddr, buf, 2);
	if (rc < 0)
		return rc;

	*rdata = buf[0] << 8 | buf[1];

	if (rc < 0)
		CDBG("mt9p012_i2c_read failed!\n");

	return rc;
}

static int32_t mt9p012_i2c_txdata(unsigned short saddr, unsigned char *txdata,
	int length)
{
	struct i2c_msg msg[] = {
		{
		.addr  = saddr,
		.flags = 0,
		.len = length,
		.buf = txdata,
		},
	};

	if (i2c_transfer(mt9p012_client->adapter, msg, 1) < 0) {
		CDBG("mt9p012_i2c_txdata failed\n");
		return -EIO;
	}

	return 0;
}

static int32_t mt9p012_i2c_write_b(unsigned short saddr, unsigned short baddr,
	unsigned short bdata)
{
	int32_t rc = -EIO;
	unsigned char buf[2];

	memset(buf, 0, sizeof(buf));
	buf[0] = baddr;
	buf[1] = bdata;
	rc = mt9p012_i2c_txdata(saddr, buf, 2);

	if (rc < 0)
		CDBG("i2c_write failed, saddr = 0x%x addr = 0x%x, val =0x%x!\n",
		saddr, baddr, bdata);

	return rc;
}

static int32_t mt9p012_i2c_write_w(unsigned short saddr, unsigned short waddr,
	unsigned short wdata)
{
	int32_t rc = -EIO;
	unsigned char buf[4];

	memset(buf, 0, sizeof(buf));
	buf[0] = (waddr & 0xFF00)>>8;
	buf[1] = (waddr & 0x00FF);
	buf[2] = (wdata & 0xFF00)>>8;
	buf[3] = (wdata & 0x00FF);

	rc = mt9p012_i2c_txdata(saddr, buf, 4);

	if (rc < 0)
		CDBG("i2c_write_w failed, addr = 0x%x, val = 0x%x!\n",
			waddr, wdata);

	return rc;
}

static int32_t mt9p012_i2c_write_w_table(
	struct mt9p012_i2c_reg_conf *reg_conf_tbl, int num)
{
	int i;
	int32_t rc = -EIO;

	for (i = 0; i < num; i++) {
		rc = mt9p012_i2c_write_w(mt9p012_client->addr,
			reg_conf_tbl->waddr, reg_conf_tbl->wdata);
		if (rc < 0)
			break;
		reg_conf_tbl++;
	}

	return rc;
}

static int32_t mt9p012_test(enum mt9p012_test_mode mo)
{
	int32_t rc = 0;

	rc = mt9p012_i2c_write_w(mt9p012_client->addr,
		REG_GROUPED_PARAMETER_HOLD,
		GROUPED_PARAMETER_HOLD);
	if (rc < 0)
		return rc;

	if (mo == TEST_OFF)
		return 0;
	else {
		rc = mt9p012_i2c_write_w_table(mt9p012_regs.ttbl, mt9p012_regs.ttbl_size);
		if (rc < 0)
			return rc;

		rc = mt9p012_i2c_write_w(mt9p012_client->addr,
				REG_TEST_PATTERN_MODE, (uint16_t)mo);
		if (rc < 0)
			return rc;
	}

	rc = mt9p012_i2c_write_w(mt9p012_client->addr,
		REG_GROUPED_PARAMETER_HOLD,
		GROUPED_PARAMETER_UPDATE);
	if (rc < 0)
		return rc;

	return rc;
}

static int32_t mt9p012_lens_shading_enable(uint8_t is_enable)
{
	int32_t rc = 0;

	CDBG("%s: entered. enable = %d\n", __func__, is_enable);

	rc = mt9p012_i2c_write_w(mt9p012_client->addr,
		REG_GROUPED_PARAMETER_HOLD, GROUPED_PARAMETER_HOLD);
	if (rc < 0)
		return rc;

	rc = mt9p012_i2c_write_w(mt9p012_client->addr, 0x3780,
		((uint16_t) is_enable) << 15);
	if (rc < 0)
		return rc;

	rc = mt9p012_i2c_write_w(mt9p012_client->addr,
		REG_GROUPED_PARAMETER_HOLD, GROUPED_PARAMETER_UPDATE);

	CDBG("%s: exiting. rc = %d\n", __func__, rc);
	return rc;
}

static int32_t mt9p012_set_lc(void)
{
	int32_t rc;

	rc = mt9p012_i2c_write_w_table(mt9p012_regs.lctbl, mt9p012_regs.lctbl_size);
	if (rc < 0)
		return rc;

	rc = mt9p012_i2c_write_w_table(mt9p012_regs.rftbl, mt9p012_regs.rftbl_size);

	return rc;
}

static void mt9p012_get_pict_fps(uint16_t fps, uint16_t *pfps)
{
	/* input fps is preview fps in Q8 format */
	uint32_t divider;   /*Q10 */
	uint32_t pclk_mult; /*Q10 */

	if (mt9p012_ctrl->prev_res == QTR_SIZE) {
		divider = (uint32_t)
		(((mt9p012_regs.reg_pat[RES_PREVIEW].frame_length_lines *
		mt9p012_regs.reg_pat[RES_PREVIEW].line_length_pck) * 0x00000400) /
		(mt9p012_regs.reg_pat[RES_CAPTURE].frame_length_lines *
		mt9p012_regs.reg_pat[RES_CAPTURE].line_length_pck));

		pclk_mult =
		(uint32_t) ((mt9p012_regs.reg_pat[RES_CAPTURE].pll_multiplier *
		0x00000400) / (mt9p012_regs.reg_pat[RES_PREVIEW].pll_multiplier));
	} else {
		/* full size resolution used for preview. */
		divider   = 0x00000400;  /*1.0 */
		pclk_mult = 0x00000400;  /*1.0 */
	}

	/* Verify PCLK settings and frame sizes. */
	*pfps = (uint16_t) (fps * divider * pclk_mult / 0x00000400 /
		0x00000400);
}

static uint16_t mt9p012_get_prev_lines_pf(void)
{
	if (mt9p012_ctrl->prev_res == QTR_SIZE)
		return mt9p012_regs.reg_pat[RES_PREVIEW].frame_length_lines;
	else
		return mt9p012_regs.reg_pat[RES_CAPTURE].frame_length_lines;
}

static uint16_t mt9p012_get_prev_pixels_pl(void)
{
	if (mt9p012_ctrl->prev_res == QTR_SIZE)
		return mt9p012_regs.reg_pat[RES_PREVIEW].line_length_pck;
	else
		return mt9p012_regs.reg_pat[RES_CAPTURE].line_length_pck;
}

static uint16_t mt9p012_get_pict_lines_pf(void)
{
	return mt9p012_regs.reg_pat[RES_CAPTURE].frame_length_lines;
}

static uint16_t mt9p012_get_pict_pixels_pl(void)
{
	return mt9p012_regs.reg_pat[RES_CAPTURE].line_length_pck;
}

static uint32_t mt9p012_get_pict_max_exp_lc(void)
{
	uint16_t snapshot_lines_per_frame;

	if (mt9p012_ctrl->pict_res == QTR_SIZE)
		snapshot_lines_per_frame =
		mt9p012_regs.reg_pat[RES_PREVIEW].frame_length_lines - 1;
	else
		snapshot_lines_per_frame =
		mt9p012_regs.reg_pat[RES_CAPTURE].frame_length_lines - 1;

	return snapshot_lines_per_frame * 24;
}

static int32_t mt9p012_set_fps(struct fps_cfg *fps)
{
	/* input is new fps in Q10 format */
	int32_t rc = 0;

	mt9p012_ctrl->fps_divider = fps->fps_div;
	mt9p012_ctrl->pict_fps_divider = fps->pict_fps_div;

	rc =
		mt9p012_i2c_write_w(mt9p012_client->addr,
			REG_GROUPED_PARAMETER_HOLD,
			GROUPED_PARAMETER_HOLD);
	if (rc < 0)
		return -EBUSY;

	rc =
		mt9p012_i2c_write_w(mt9p012_client->addr,
			REG_LINE_LENGTH_PCK,
			(mt9p012_regs.reg_pat[RES_PREVIEW].line_length_pck *
			fps->f_mult / 0x00000400));
	if (rc < 0)
		return rc;

	rc =
		mt9p012_i2c_write_w(mt9p012_client->addr,
			REG_GROUPED_PARAMETER_HOLD,
			GROUPED_PARAMETER_UPDATE);

	return rc;
}

static int32_t mt9p012_write_exp_gain(uint16_t gain, uint32_t line)
{
	uint16_t max_legal_gain = 0x01FF;
	uint32_t line_length_ratio = 0x00000400;
	enum mt9p012_setting setting;
	int32_t rc = 0;

	CDBG("Line:%d mt9p012_write_exp_gain \n", __LINE__);

	if (mt9p012_ctrl->sensormode == SENSOR_PREVIEW_MODE) {
		mt9p012_ctrl->my_reg_gain = gain;
		mt9p012_ctrl->my_reg_line_count = (uint16_t)line;
	}

	if (gain > max_legal_gain) {
		CDBG("Max legal gain Line:%d \n", __LINE__);
		gain = max_legal_gain;
	}

	/* Verify no overflow */
	if (mt9p012_ctrl->sensormode != SENSOR_SNAPSHOT_MODE) {
		line = (uint32_t)(line * mt9p012_ctrl->fps_divider /
			0x00000400);
		setting = RES_PREVIEW;
	} else {
		line = (uint32_t)(line * mt9p012_ctrl->pict_fps_divider /
			0x00000400);
		setting = RES_CAPTURE;
	}

	/* Set digital gain to 1 */
#ifdef MT9P012_REV_7
	gain |= 0x1000;
#else
	gain |= 0x0200;
#endif

	if ((mt9p012_regs.reg_pat[setting].frame_length_lines - 1) < line) {
		line_length_ratio = (uint32_t) (line * 0x00000400) /
		(mt9p012_regs.reg_pat[setting].frame_length_lines - 1);
	} else
		line_length_ratio = 0x00000400;

	rc =
		mt9p012_i2c_write_w(mt9p012_client->addr,
			REG_GROUPED_PARAMETER_HOLD,
			GROUPED_PARAMETER_HOLD);
	if (rc < 0) {
		CDBG("mt9p012_i2c_write_w failed... Line:%d \n", __LINE__);
		return rc;
	}

	rc =
		mt9p012_i2c_write_w(
			mt9p012_client->addr,
			REG_GLOBAL_GAIN, gain);
	if (rc < 0) {
		CDBG("mt9p012_i2c_write_w failed... Line:%d \n", __LINE__);
		return rc;
	}

	rc =
		mt9p012_i2c_write_w(mt9p012_client->addr,
			REG_COARSE_INT_TIME,
			line);
	if (rc < 0) {
		CDBG("mt9p012_i2c_write_w failed... Line:%d \n", __LINE__);
		return rc;
	}

	CDBG("mt9p012_write_exp_gain: gain = %d, line = %d\n", gain, line);

	rc =
		mt9p012_i2c_write_w(mt9p012_client->addr,
			REG_GROUPED_PARAMETER_HOLD,
			GROUPED_PARAMETER_UPDATE);
	if (rc < 0)
		CDBG("mt9p012_i2c_write_w failed... Line:%d \n", __LINE__);

	return rc;
}

static int32_t mt9p012_set_pict_exp_gain(uint16_t gain, uint32_t line)
{
	int32_t rc = 0;

	CDBG("Line:%d mt9p012_set_pict_exp_gain \n", __LINE__);

	rc =
		mt9p012_write_exp_gain(gain, line);
	if (rc < 0) {
		CDBG("Line:%d mt9p012_set_pict_exp_gain failed... \n",
			__LINE__);
		return rc;
	}

	rc =
	mt9p012_i2c_write_w(mt9p012_client->addr,
		MT9P012_REG_RESET_REGISTER,
		0x10CC | 0x0002);
	if (rc < 0) {
		CDBG("mt9p012_i2c_write_w failed... Line:%d \n", __LINE__);
		return rc;
	}

	mdelay(5);

	/* camera_timed_wait(snapshot_wait*exposure_ratio); */
	return rc;
}

static int32_t mt9p012_setting(enum mt9p012_reg_update rupdate,
	enum mt9p012_setting rt)
{
	int32_t rc = 0;

	switch (rupdate) {
	case UPDATE_PERIODIC:
	if (rt == RES_PREVIEW || rt == RES_CAPTURE) {

		struct mt9p012_i2c_reg_conf ppc_tbl[] = {
		{REG_GROUPED_PARAMETER_HOLD, GROUPED_PARAMETER_HOLD},
		{REG_ROW_SPEED, mt9p012_regs.reg_pat[rt].row_speed},
		{REG_X_ADDR_START, mt9p012_regs.reg_pat[rt].x_addr_start},
		{REG_X_ADDR_END, mt9p012_regs.reg_pat[rt].x_addr_end},
		{REG_Y_ADDR_START, mt9p012_regs.reg_pat[rt].y_addr_start},
		{REG_Y_ADDR_END, mt9p012_regs.reg_pat[rt].y_addr_end},
		{REG_READ_MODE, mt9p012_regs.reg_pat[rt].read_mode},
		{REG_SCALE_M, mt9p012_regs.reg_pat[rt].scale_m},
		{REG_X_OUTPUT_SIZE, mt9p012_regs.reg_pat[rt].x_output_size},
		{REG_Y_OUTPUT_SIZE, mt9p012_regs.reg_pat[rt].y_output_size},

		{REG_LINE_LENGTH_PCK, mt9p012_regs.reg_pat[rt].line_length_pck},
		{REG_FRAME_LENGTH_LINES,
			(mt9p012_regs.reg_pat[rt].frame_length_lines *
			mt9p012_ctrl->fps_divider / 0x00000400)},
		{REG_COARSE_INT_TIME, mt9p012_regs.reg_pat[rt].coarse_int_time},
		{REG_FINE_INTEGRATION_TIME, mt9p012_regs.reg_pat[rt].fine_int_time},
		{REG_GROUPED_PARAMETER_HOLD, GROUPED_PARAMETER_UPDATE},
		};

		rc = mt9p012_i2c_write_w_table(&ppc_tbl[0],
			ARRAY_SIZE(ppc_tbl));
		if (rc < 0)
			return rc;

		rc = mt9p012_test(mt9p012_ctrl->set_test);
		if (rc < 0)
			return rc;

		rc =
			mt9p012_i2c_write_w(mt9p012_client->addr,
			MT9P012_REG_RESET_REGISTER,
			MT9P012_RESET_REGISTER_PWON | 0x0002);
		if (rc < 0)
			return rc;

		mdelay(5); /* 15? wait for sensor to transition*/

		return rc;
	}
	break; /* UPDATE_PERIODIC */

	case REG_INIT:
	if (rt == RES_PREVIEW || rt == RES_CAPTURE) {
		struct mt9p012_i2c_reg_conf ipc_tbl1[] = {
		{MT9P012_REG_RESET_REGISTER, MT9P012_RESET_REGISTER_PWOFF},
		{REG_VT_PIX_CLK_DIV, mt9p012_regs.reg_pat[rt].vt_pix_clk_div},
		{REG_VT_SYS_CLK_DIV, mt9p012_regs.reg_pat[rt].vt_sys_clk_div},
		{REG_PRE_PLL_CLK_DIV, mt9p012_regs.reg_pat[rt].pre_pll_clk_div},
		{REG_PLL_MULTIPLIER, mt9p012_regs.reg_pat[rt].pll_multiplier},
		{REG_OP_PIX_CLK_DIV, mt9p012_regs.reg_pat[rt].op_pix_clk_div},
		{REG_OP_SYS_CLK_DIV, mt9p012_regs.reg_pat[rt].op_sys_clk_div},
#ifdef MT9P012_REV_7
		{0x30B0, 0x0001},
		{0x308E, 0xE060},
		{0x3092, 0x0A52},
		{0x3094, 0x4656},
		{0x3096, 0x5652},
		{0x30CA, 0x8006},
		{0x312A, 0xDD02},
		{0x312C, 0x00E4},
		{0x3170, 0x299A},
#endif
		/* optimized settings for noise */
		{0x3088, 0x6FF6},
		{0x3154, 0x0282},
		{0x3156, 0x0381},
		{0x3162, 0x04CE},
		{0x0204, 0x0010},
		{0x0206, 0x0010},
		{0x0208, 0x0010},
		{0x020A, 0x0010},
		{0x020C, 0x0010},
		{MT9P012_REG_RESET_REGISTER, MT9P012_RESET_REGISTER_PWON},
		};

		struct mt9p012_i2c_reg_conf ipc_tbl2[] = {
		{MT9P012_REG_RESET_REGISTER, MT9P012_RESET_REGISTER_PWOFF},
		{REG_VT_PIX_CLK_DIV, mt9p012_regs.reg_pat[rt].vt_pix_clk_div},
		{REG_VT_SYS_CLK_DIV, mt9p012_regs.reg_pat[rt].vt_sys_clk_div},
		{REG_PRE_PLL_CLK_DIV, mt9p012_regs.reg_pat[rt].pre_pll_clk_div},
		{REG_PLL_MULTIPLIER, mt9p012_regs.reg_pat[rt].pll_multiplier},
		{REG_OP_PIX_CLK_DIV, mt9p012_regs.reg_pat[rt].op_pix_clk_div},
		{REG_OP_SYS_CLK_DIV, mt9p012_regs.reg_pat[rt].op_sys_clk_div},
#ifdef MT9P012_REV_7
		{0x30B0, 0x0001},
		{0x308E, 0xE060},
		{0x3092, 0x0A52},
		{0x3094, 0x4656},
		{0x3096, 0x5652},
		{0x30CA, 0x8006},
		{0x312A, 0xDD02},
		{0x312C, 0x00E4},
		{0x3170, 0x299A},
#endif
		/* optimized settings for noise */
		{0x3088, 0x6FF6},
		{0x3154, 0x0282},
		{0x3156, 0x0381},
		{0x3162, 0x04CE},
		{0x0204, 0x0010},
		{0x0206, 0x0010},
		{0x0208, 0x0010},
		{0x020A, 0x0010},
		{0x020C, 0x0010},
		{MT9P012_REG_RESET_REGISTER, MT9P012_RESET_REGISTER_PWON},
		};

		struct mt9p012_i2c_reg_conf ipc_tbl3[] = {
		{REG_GROUPED_PARAMETER_HOLD, GROUPED_PARAMETER_HOLD},
		/* Set preview or snapshot mode */
		{REG_ROW_SPEED, mt9p012_regs.reg_pat[rt].row_speed},
		{REG_X_ADDR_START, mt9p012_regs.reg_pat[rt].x_addr_start},
		{REG_X_ADDR_END, mt9p012_regs.reg_pat[rt].x_addr_end},
		{REG_Y_ADDR_START, mt9p012_regs.reg_pat[rt].y_addr_start},
		{REG_Y_ADDR_END, mt9p012_regs.reg_pat[rt].y_addr_end},
		{REG_READ_MODE, mt9p012_regs.reg_pat[rt].read_mode},
		{REG_SCALE_M, mt9p012_regs.reg_pat[rt].scale_m},
		{REG_X_OUTPUT_SIZE, mt9p012_regs.reg_pat[rt].x_output_size},
		{REG_Y_OUTPUT_SIZE, mt9p012_regs.reg_pat[rt].y_output_size},
		{REG_LINE_LENGTH_PCK, mt9p012_regs.reg_pat[rt].line_length_pck},
		{REG_FRAME_LENGTH_LINES,
			mt9p012_regs.reg_pat[rt].frame_length_lines},
		{REG_COARSE_INT_TIME, mt9p012_regs.reg_pat[rt].coarse_int_time},
		{REG_FINE_INTEGRATION_TIME, mt9p012_regs.reg_pat[rt].fine_int_time},
		{REG_GROUPED_PARAMETER_HOLD, GROUPED_PARAMETER_UPDATE},
		};

		/* reset fps_divider */
		mt9p012_ctrl->fps_divider = 1 * 0x0400;

		rc = mt9p012_i2c_write_w_table(&ipc_tbl1[0],
			ARRAY_SIZE(ipc_tbl1));
		if (rc < 0)
			return rc;

		rc = mt9p012_i2c_write_w_table(&ipc_tbl2[0],
			ARRAY_SIZE(ipc_tbl2));
		if (rc < 0)
			return rc;

		mdelay(5);

		rc = mt9p012_i2c_write_w_table(&ipc_tbl3[0],
			ARRAY_SIZE(ipc_tbl3));
		if (rc < 0)
			return rc;

		/* load lens shading */
		rc = mt9p012_i2c_write_w(mt9p012_client->addr,
			REG_GROUPED_PARAMETER_HOLD, GROUPED_PARAMETER_HOLD);
		if (rc < 0)
			return rc;

		rc = mt9p012_set_lc();
		if (rc < 0)
			return rc;

		rc = mt9p012_i2c_write_w(mt9p012_client->addr,
			REG_GROUPED_PARAMETER_HOLD, GROUPED_PARAMETER_UPDATE);

		if (rc < 0)
			return rc;
	}
	break; /* case REG_INIT: */

	default:
		rc = -EINVAL;
		break;
	} /* switch (rupdate) */

	return rc;
}

static int32_t mt9p012_video_config(int mode, int res)
{
	int32_t rc;

	switch (res) {
	case QTR_SIZE:
		rc = mt9p012_setting(UPDATE_PERIODIC, RES_PREVIEW);
		if (rc < 0)
			return rc;

		CDBG("mt9p012 sensor configuration done!\n");
		break;

	case FULL_SIZE:
		rc =
		mt9p012_setting(UPDATE_PERIODIC, RES_CAPTURE);
		if (rc < 0)
			return rc;

		break;

	default:
		return 0;
	} /* switch */

	mt9p012_ctrl->prev_res = res;
	mt9p012_ctrl->curr_res = res;
	mt9p012_ctrl->sensormode = mode;

	rc =
		mt9p012_write_exp_gain(mt9p012_ctrl->my_reg_gain,
			mt9p012_ctrl->my_reg_line_count);

	rc =
		mt9p012_i2c_write_w(mt9p012_client->addr,
			MT9P012_REG_RESET_REGISTER,
			0x10cc|0x0002);

	return rc;
}

static int32_t mt9p012_snapshot_config(int mode)
{
	int32_t rc = 0;

	rc = mt9p012_setting(UPDATE_PERIODIC, RES_CAPTURE);
	if (rc < 0)
		return rc;

	mt9p012_ctrl->curr_res = mt9p012_ctrl->pict_res;

	mt9p012_ctrl->sensormode = mode;

	return rc;
}

static int32_t mt9p012_raw_snapshot_config(int mode)
{
	int32_t rc = 0;

	rc = mt9p012_setting(UPDATE_PERIODIC, RES_CAPTURE);
	if (rc < 0)
		return rc;

	mt9p012_ctrl->curr_res = mt9p012_ctrl->pict_res;

	mt9p012_ctrl->sensormode = mode;

	return rc;
}

static int32_t mt9p012_power_down(void)
{
	int32_t rc = 0;

	rc = mt9p012_i2c_write_w(mt9p012_client->addr,
		MT9P012_REG_RESET_REGISTER,
		MT9P012_RESET_REGISTER_PWOFF);

	mdelay(5);
	return rc;
}

static int32_t mt9p012_move_focus(int direction, int32_t num_steps)
{
	int16_t step_direction;
	int16_t actual_step;
	int16_t next_position;
	uint8_t code_val_msb, code_val_lsb;

	if (num_steps > MT9P012_TOTAL_STEPS_NEAR_TO_FAR)
		num_steps = MT9P012_TOTAL_STEPS_NEAR_TO_FAR;
	else if (num_steps == 0) {
		CDBG("mt9p012_move_focus failed at line %d ...\n", __LINE__);
		return -EINVAL;
	}

	if (direction == MOVE_NEAR)
		step_direction = 16; /* 10bit */
	else if (direction == MOVE_FAR)
		step_direction = -16; /* 10 bit */
	else {
		CDBG("mt9p012_move_focus failed at line %d ...\n", __LINE__);
		return -EINVAL;
	}

	if (mt9p012_ctrl->curr_lens_pos < mt9p012_ctrl->init_curr_lens_pos)
		mt9p012_ctrl->curr_lens_pos =
			mt9p012_ctrl->init_curr_lens_pos;

	actual_step = (int16_t)(step_direction * (int16_t)num_steps);
	next_position = (int16_t)(mt9p012_ctrl->curr_lens_pos + actual_step);

	if (next_position > 1023)
		next_position = 1023;
	else if (next_position < 0)
		next_position = 0;

	code_val_msb = next_position >> 4;
	code_val_lsb = (next_position & 0x000F) << 4;
	/* code_val_lsb |= mode_mask; */

	/* Writing the digital code for current to the actuator */
	if (mt9p012_i2c_write_b(MT9P012_AF_I2C_ADDR >> 1,
		code_val_msb, code_val_lsb) < 0) {
		CDBG("mt9p012_move_focus failed at line %d ...\n", __LINE__);
		return -EBUSY;
	}

	/* Storing the current lens Position */
	mt9p012_ctrl->curr_lens_pos = next_position;

	return 0;
}

static int32_t mt9p012_set_default_focus(void)
{
	int32_t rc = 0;
	uint8_t code_val_msb, code_val_lsb;

	code_val_msb = 0x00;
	code_val_lsb = 0x00;

	/* Write the digital code for current to the actuator */
	rc = mt9p012_i2c_write_b(MT9P012_AF_I2C_ADDR >> 1,
		code_val_msb, code_val_lsb);

	mt9p012_ctrl->curr_lens_pos = 0;
	mt9p012_ctrl->init_curr_lens_pos = 0;

	return rc;
}

static int mt9p012_probe_init_done(const struct msm_camera_sensor_info *data)
{
	gpio_direction_output(data->sensor_reset, 0);
	gpio_free(data->sensor_reset);
	return 0;
}

static int mt9p012_probe_init_sensor(const struct msm_camera_sensor_info *data)
{
	int32_t  rc;
	uint16_t chipid;

	rc = gpio_request(data->sensor_reset, "mt9p012");
	if (!rc)
		gpio_direction_output(data->sensor_reset, 1);
	else
		goto init_probe_done;

	mdelay(20);

	/* RESET the sensor image part via I2C command */
	CDBG("mt9p012_sensor_init(): reseting sensor.\n");
	rc = mt9p012_i2c_write_w(mt9p012_client->addr,
		MT9P012_REG_RESET_REGISTER, 0x10CC|0x0001);
	if (rc < 0) {
		CDBG("sensor reset failed. rc = %d\n", rc);
		goto init_probe_fail;
	}

	mdelay(MT9P012_RESET_DELAY_MSECS);

	/* 3. Read sensor Model ID: */
	rc = mt9p012_i2c_read_w(mt9p012_client->addr,
		MT9P012_REG_MODEL_ID, &chipid);
	if (rc < 0)
		goto init_probe_fail;

	/* 4. Compare sensor ID to MT9T012VC ID: */
	if (chipid != MT9P012_MODEL_ID) {
		CDBG("mt9p012 wrong model_id = 0x%x\n", chipid);
		rc = -ENODEV;
		goto init_probe_fail;
	}

	rc = mt9p012_i2c_write_w(mt9p012_client->addr, 0x306E, 0x9000);
	if (rc < 0) {
		CDBG("REV_7 write failed. rc = %d\n", rc);
		goto init_probe_fail;
	}

	/* RESET_REGISTER, enable parallel interface and disable serialiser */
	CDBG("mt9p012_sensor_init(): enabling parallel interface.\n");
	rc = mt9p012_i2c_write_w(mt9p012_client->addr, 0x301A, 0x10CC);
	if (rc < 0) {
		CDBG("enable parallel interface failed. rc = %d\n", rc);
		goto init_probe_fail;
	}

	/* To disable the 2 extra lines */
	rc = mt9p012_i2c_write_w(mt9p012_client->addr,
		0x3064, 0x0805);

	if (rc < 0) {
		CDBG("disable the 2 extra lines failed. rc = %d\n", rc);
		goto init_probe_fail;
	}

	mdelay(MT9P012_RESET_DELAY_MSECS);
	goto init_probe_done;

init_probe_fail:
	mt9p012_probe_init_done(data);
init_probe_done:
	return rc;
}

static int mt9p012_sensor_open_init(const struct msm_camera_sensor_info *data)
{
	int32_t  rc;

	mt9p012_ctrl = kzalloc(sizeof(struct mt9p012_ctrl), GFP_KERNEL);
	if (!mt9p012_ctrl) {
		CDBG("mt9p012_init failed!\n");
		rc = -ENOMEM;
		goto init_done;
	}

	mt9p012_ctrl->fps_divider = 1 * 0x00000400;
	mt9p012_ctrl->pict_fps_divider = 1 * 0x00000400;
	mt9p012_ctrl->set_test = TEST_OFF;
	mt9p012_ctrl->prev_res = QTR_SIZE;
	mt9p012_ctrl->pict_res = FULL_SIZE;

	if (data)
		mt9p012_ctrl->sensordata = data;

	/* enable mclk first */
	msm_camio_clk_rate_set(MT9P012_DEFAULT_CLOCK_RATE);
	mdelay(20);

	msm_camio_camif_pad_reg_reset();
	mdelay(20);

	rc = mt9p012_probe_init_sensor(data);
	if (rc < 0)
		goto init_fail1;

	if (mt9p012_ctrl->prev_res == QTR_SIZE)
		rc = mt9p012_setting(REG_INIT, RES_PREVIEW);
	else
		rc = mt9p012_setting(REG_INIT, RES_CAPTURE);

	if (rc < 0) {
		CDBG("mt9p012_setting failed. rc = %d\n", rc);
		goto init_fail1;
	}

	/* sensor : output enable */
	CDBG("mt9p012_sensor_open_init(): enabling output.\n");
	rc = mt9p012_i2c_write_w(mt9p012_client->addr,
		MT9P012_REG_RESET_REGISTER, MT9P012_RESET_REGISTER_PWON);
	if (rc < 0) {
		CDBG("sensor output enable failed. rc = %d\n", rc);
		goto init_fail1;
	}

	/* TODO: enable AF actuator */
#if 0
	CDBG("enable AF actuator, gpio = %d\n",
		mt9p012_ctrl->sensordata->vcm_pwd);
	rc = gpio_request(mt9p012_ctrl->sensordata->vcm_pwd, "mt9p012");
	if (!rc)
		gpio_direction_output(mt9p012_ctrl->sensordata->vcm_pwd, 1);
	else {
		CDBG("mt9p012_ctrl gpio request failed!\n");
		goto init_fail1;
	}
	mdelay(20);

	rc = mt9p012_set_default_focus();
#endif
	if (rc >= 0)
		goto init_done;

	/* TODO:
	 * gpio_direction_output(mt9p012_ctrl->sensordata->vcm_pwd, 0);
	 * gpio_free(mt9p012_ctrl->sensordata->vcm_pwd); */
init_fail1:
	mt9p012_probe_init_done(data);
	kfree(mt9p012_ctrl);
init_done:
	return rc;
}

static int mt9p012_init_client(struct i2c_client *client)
{
	/* Initialize the MSM_CAMI2C Chip */
	init_waitqueue_head(&mt9p012_wait_queue);
	return 0;
}

static int32_t mt9p012_set_sensor_mode(int mode, int res)
{
	int32_t rc = 0;

	switch (mode) {
	case SENSOR_PREVIEW_MODE:
		rc = mt9p012_video_config(mode, res);
		break;

	case SENSOR_SNAPSHOT_MODE:
		rc = mt9p012_snapshot_config(mode);
		break;

	case SENSOR_RAW_SNAPSHOT_MODE:
		rc = mt9p012_raw_snapshot_config(mode);
		break;

	default:
		rc = -EINVAL;
		break;
	}

	return rc;
}

int mt9p012_sensor_config(void __user *argp)
{
	struct sensor_cfg_data cdata;
	int rc = 0;

	if (copy_from_user(&cdata,
			(void *)argp,
			sizeof(struct sensor_cfg_data)))
		return -EFAULT;

	down(&mt9p012_sem);

		CDBG("%s: cfgtype = %d\n", __func__, cdata.cfgtype);
	switch (cdata.cfgtype) {
	case CFG_GET_PICT_FPS:
		mt9p012_get_pict_fps(cdata.cfg.gfps.prevfps,
				&(cdata.cfg.gfps.pictfps));

		if (copy_to_user((void *)argp, &cdata,
				sizeof(struct sensor_cfg_data)))
			rc = -EFAULT;
		break;

	case CFG_GET_PREV_L_PF:
		cdata.cfg.prevl_pf = mt9p012_get_prev_lines_pf();

		if (copy_to_user((void *)argp,
				&cdata,
				sizeof(struct sensor_cfg_data)))
			rc = -EFAULT;
		break;

	case CFG_GET_PREV_P_PL:
		cdata.cfg.prevp_pl = mt9p012_get_prev_pixels_pl();

		if (copy_to_user((void *)argp,
				&cdata,
				sizeof(struct sensor_cfg_data)))
			rc = -EFAULT;
		break;

	case CFG_GET_PICT_L_PF:
		cdata.cfg.pictl_pf = mt9p012_get_pict_lines_pf();

		if (copy_to_user((void *)argp,
				&cdata,
				sizeof(struct sensor_cfg_data)))
			rc = -EFAULT;
		break;

	case CFG_GET_PICT_P_PL:
		cdata.cfg.pictp_pl = mt9p012_get_pict_pixels_pl();

		if (copy_to_user((void *)argp,
				&cdata,
				sizeof(struct sensor_cfg_data)))
			rc = -EFAULT;
		break;

	case CFG_GET_PICT_MAX_EXP_LC:
		cdata.cfg.pict_max_exp_lc =
			mt9p012_get_pict_max_exp_lc();

		if (copy_to_user((void *)argp,
				&cdata,
				sizeof(struct sensor_cfg_data)))
			rc = -EFAULT;
		break;

	case CFG_SET_FPS:
	case CFG_SET_PICT_FPS:
		rc = mt9p012_set_fps(&(cdata.cfg.fps));
		break;

	case CFG_SET_EXP_GAIN:
		rc = mt9p012_write_exp_gain(cdata.cfg.exp_gain.gain,
				cdata.cfg.exp_gain.line);
		break;

	case CFG_SET_PICT_EXP_GAIN:
		CDBG("Line:%d CFG_SET_PICT_EXP_GAIN \n", __LINE__);
		rc = mt9p012_set_pict_exp_gain(cdata.cfg.exp_gain.gain,
				cdata.cfg.exp_gain.line);
		break;

	case CFG_SET_MODE:
		rc = mt9p012_set_sensor_mode(cdata.mode, cdata.rs);
		break;

	case CFG_PWR_DOWN:
		rc = mt9p012_power_down();
		break;

	case CFG_MOVE_FOCUS:
		CDBG("mt9p012_ioctl: CFG_MOVE_FOCUS: cdata.cfg.focus.dir=%d cdata.cfg.focus.steps=%d\n",
				cdata.cfg.focus.dir, cdata.cfg.focus.steps);
		rc = mt9p012_move_focus(cdata.cfg.focus.dir,
					cdata.cfg.focus.steps);
		break;

	case CFG_SET_DEFAULT_FOCUS:
		rc = mt9p012_set_default_focus();
		break;

	case CFG_SET_LENS_SHADING:
		CDBG("%s: CFG_SET_LENS_SHADING\n", __func__);
		rc = mt9p012_lens_shading_enable(cdata.cfg.lens_shading);
		break;

	case CFG_GET_AF_MAX_STEPS:
		cdata.max_steps = MT9P012_STEPS_NEAR_TO_CLOSEST_INF;
		if (copy_to_user((void *)argp,
				&cdata,
				sizeof(struct sensor_cfg_data)))
			rc = -EFAULT;
		break;

	case CFG_SET_EFFECT:
	default:
		rc = -EINVAL;
		break;
	}

	up(&mt9p012_sem);
	return rc;
}

int mt9p012_sensor_release(void)
{
	int rc = -EBADF;

	down(&mt9p012_sem);

	mt9p012_power_down();

	gpio_direction_output(mt9p012_ctrl->sensordata->sensor_reset,
		0);
	gpio_free(mt9p012_ctrl->sensordata->sensor_reset);

	gpio_direction_output(mt9p012_ctrl->sensordata->vcm_pwd, 0);
	gpio_free(mt9p012_ctrl->sensordata->vcm_pwd);

	kfree(mt9p012_ctrl);
	mt9p012_ctrl = NULL;

	CDBG("mt9p012_release completed\n");

	up(&mt9p012_sem);
	return rc;
}

static int mt9p012_i2c_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
{
	int rc = 0;
	CDBG("mt9p012_probe called!\n");

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		CDBG("i2c_check_functionality failed\n");
		goto probe_failure;
	}

	mt9p012_sensorw = kzalloc(sizeof(struct mt9p012_work), GFP_KERNEL);
	if (!mt9p012_sensorw) {
		CDBG("kzalloc failed.\n");
		rc = -ENOMEM;
		goto probe_failure;
	}

	i2c_set_clientdata(client, mt9p012_sensorw);
	mt9p012_init_client(client);
	mt9p012_client = client;

	mdelay(50);

	CDBG("mt9p012_probe successed! rc = %d\n", rc);
	return 0;

probe_failure:
	CDBG("mt9p012_probe failed! rc = %d\n", rc);
	return rc;
}

static const struct i2c_device_id mt9p012_i2c_id[] = {
	{ "mt9p012", 0},
	{ }
};

static struct i2c_driver mt9p012_i2c_driver = {
	.id_table = mt9p012_i2c_id,
	.probe  = mt9p012_i2c_probe,
	.remove = __exit_p(mt9p012_i2c_remove),
	.driver = {
		.name = "mt9p012",
	},
};

static int mt9p012_sensor_probe(const struct msm_camera_sensor_info *info,
				struct msm_sensor_ctrl *s)
{
	int rc = i2c_add_driver(&mt9p012_i2c_driver);
	if (rc < 0 || mt9p012_client == NULL) {
		rc = -ENOTSUPP;
		goto probe_done;
	}

	msm_camio_clk_rate_set(MT9P012_DEFAULT_CLOCK_RATE);
	mdelay(20);

	rc = mt9p012_probe_init_sensor(info);
	if (rc < 0)
		goto probe_done;

	s->s_init = mt9p012_sensor_open_init;
	s->s_release = mt9p012_sensor_release;
	s->s_config  = mt9p012_sensor_config;
	mt9p012_probe_init_done(info);

probe_done:
	CDBG("%s %s:%d\n", __FILE__, __func__, __LINE__);
	return rc;
}

static int __mt9p012_probe(struct platform_device *pdev)
{
	return msm_camera_drv_start(pdev, mt9p012_sensor_probe);
}

static struct platform_driver msm_camera_driver = {
	.probe = __mt9p012_probe,
	.driver = {
		.name = "msm_camera_mt9p012",
		.owner = THIS_MODULE,
	},
};

static int __init mt9p012_init(void)
{
	return platform_driver_register(&msm_camera_driver);
}

module_init(mt9p012_init);