/* drivers/input/touchscreen/goodix_tool.c
 *
 * 2010 - 2012 Goodix Technology.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be a reference
 * to you, when you are integrating the GOODiX's CTP IC into your system,
 * 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.
 *
 * Version:1.2
 *        V1.0:2012/05/01,create file.
 *        V1.2:2012/06/08,modify some warning.
 *        V1.4:2012/08/28,modified to support GT9XX
 *
 */

#include <linux/i2c/gt9xx.h>

/* #define IC_TYPE_NAME        "GT813" */
#define DATA_LENGTH_UINT    512
#define CMD_HEAD_LENGTH     (sizeof(struct st_cmd_head) - sizeof(u8 *))
#define GOODIX_ENTRY_NAME   "goodix_tool"

#pragma pack(1)
struct st_cmd_head {
	u8 wr;			/* write read flag 0:R  1:W  2:PID 3: */
	u8 flag;		/* 0:no need flag/int
					1: need flag  2:need int */
	u8 flag_addr[2];	/* flag address */
	u8 flag_val;		/* flag val */
	u8 flag_relation;	/* flag_val:flag 0:not equal 1:equal 2:> 3:< */
	u16 circle;		/* polling cycle */
	u8 times;		/* plling times */
	u8 retry;		/* I2C retry times */
	u16 delay;		/* delay befor read or after write */
	u16 data_len;	/* data length */
	u8 addr_len;	/* address length */
	u8 addr[2];		/* address */
	u8 res[3];		/* reserved */
	u8 *data;		/* data pointer */
};
#pragma pack()
struct st_cmd_head cmd_head;

static struct i2c_client *gt_client;

static struct proc_dir_entry *goodix_proc_entry;

static s32 goodix_tool_write(struct file *filp, const char __user *buff,
			     unsigned long len, void *data);
static s32 goodix_tool_read(char *page, char **start, off_t off, int count,
			    int *eof, void *data);
static s32(*tool_i2c_read) (u8 *, u16);
static s32(*tool_i2c_write) (u8 *, u16);

s32 DATA_LENGTH;
s8 IC_TYPE[16] = { 0 };

static s32 tool_i2c_read_no_extra(u8 *buf, u16 len)
{
	s32 ret = -1;
	s32 i = 0;
	struct i2c_msg msgs[2];

	msgs[0].flags = !I2C_M_RD;
	msgs[0].addr = gt_client->addr;
	msgs[0].len = cmd_head.addr_len;
	msgs[0].buf = &buf[0];

	msgs[1].flags = I2C_M_RD;
	msgs[1].addr = gt_client->addr;
	msgs[1].len = len;
	msgs[1].buf = &buf[GTP_ADDR_LENGTH];

	for (i = 0; i < cmd_head.retry; i++) {
		ret = i2c_transfer(gt_client->adapter, msgs, 2);
		if (ret > 0)
			break;
	}
	return ret;
}

static s32 tool_i2c_write_no_extra(u8 *buf, u16 len)
{
	s32 ret = -1;
	s32 i = 0;
	struct i2c_msg msg;

	msg.flags = !I2C_M_RD;
	msg.addr = gt_client->addr;
	msg.len = len;
	msg.buf = buf;

	for (i = 0; i < cmd_head.retry; i++) {
		ret = i2c_transfer(gt_client->adapter, &msg, 1);
		if (ret > 0)
			break;
	}
	return ret;
}

static s32 tool_i2c_read_with_extra(u8 *buf, u16 len)
{
	s32 ret = -1;
	u8 pre[2] = { 0x0f, 0xff };
	u8 end[2] = { 0x80, 0x00 };

	tool_i2c_write_no_extra(pre, 2);
	ret = tool_i2c_read_no_extra(buf, len);
	tool_i2c_write_no_extra(end, 2);

	return ret;
}

static s32 tool_i2c_write_with_extra(u8 *buf, u16 len)
{
	s32 ret = -1;
	u8 pre[2] = { 0x0f, 0xff };
	u8 end[2] = { 0x80, 0x00 };

	tool_i2c_write_no_extra(pre, 2);
	ret = tool_i2c_write_no_extra(buf, len);
	tool_i2c_write_no_extra(end, 2);

	return ret;
}

static void register_i2c_func(void)
{
/*if (!strncmp(IC_TYPE, "GT818", 5) || !strncmp(IC_TYPE, "GT816", 5) */
/*	|| !strncmp(IC_TYPE, "GT811", 5) || !strncmp(IC_TYPE, "GT818F", 6) */
/*	|| !strncmp(IC_TYPE, "GT827", 5) || !strncmp(IC_TYPE,"GT828", 5) */
/*	|| !strncmp(IC_TYPE, "GT813", 5)) */
	if (strncmp(IC_TYPE, "GT8110", 6) && strncmp(IC_TYPE, "GT8105", 6)
	    && strncmp(IC_TYPE, "GT801", 5) && strncmp(IC_TYPE, "GT800", 5)
	    && strncmp(IC_TYPE, "GT801PLUS", 9) && strncmp(IC_TYPE, "GT811", 5)
	    && strncmp(IC_TYPE, "GTxxx", 5)) {
		tool_i2c_read = tool_i2c_read_with_extra;
		tool_i2c_write = tool_i2c_write_with_extra;
		GTP_DEBUG("I2C function: with pre and end cmd!");
	} else {
		tool_i2c_read = tool_i2c_read_no_extra;
		tool_i2c_write = tool_i2c_write_no_extra;
		GTP_INFO("I2C function: without pre and end cmd!");
	}
}

static void unregister_i2c_func(void)
{
	tool_i2c_read = NULL;
	tool_i2c_write = NULL;
	GTP_INFO("I2C function: unregister i2c transfer function!");
}

s32 init_wr_node(struct i2c_client *client)
{
	s32 i;

	gt_client = client;
	memset(&cmd_head, 0, sizeof(cmd_head));
	cmd_head.data = NULL;

	i = 5;
	while ((!cmd_head.data) && i) {
		cmd_head.data = kzalloc(i * DATA_LENGTH_UINT, GFP_KERNEL);
		if (NULL != cmd_head.data)
			break;
		i--;
	}
	if (i) {
		DATA_LENGTH = i * DATA_LENGTH_UINT + GTP_ADDR_LENGTH;
		GTP_INFO("Applied memory size:%d.", DATA_LENGTH);
	} else {
		GTP_ERROR("Apply for memory failed.");
		return FAIL;
	}

	cmd_head.addr_len = 2;
	cmd_head.retry = 5;

	register_i2c_func();

	goodix_proc_entry = create_proc_entry(GOODIX_ENTRY_NAME, 0666, NULL);
	if (goodix_proc_entry == NULL) {
		GTP_ERROR("Couldn't create proc entry!");
		return FAIL;
	} else {
		GTP_INFO("Create proc entry success!");
		goodix_proc_entry->write_proc = goodix_tool_write;
		goodix_proc_entry->read_proc = goodix_tool_read;
	}

	return SUCCESS;
}

void uninit_wr_node(void)
{
	kfree(cmd_head.data);
	cmd_head.data = NULL;
	unregister_i2c_func();
	remove_proc_entry(GOODIX_ENTRY_NAME, NULL);
}

static u8 relation(u8 src, u8 dst, u8 rlt)
{
	u8 ret = 0;

	switch (rlt) {
	case 0:
		ret = (src != dst) ? true : false;
		break;

	case 1:
		ret = (src == dst) ? true : false;
		GTP_DEBUG("equal:src:0x%02x   dst:0x%02x   ret:%d.", src, dst,
			  (s32) ret);
		break;

	case 2:
		ret = (src > dst) ? true : false;
		break;

	case 3:
		ret = (src < dst) ? true : false;
		break;

	case 4:
		ret = (src & dst) ? true : false;
		break;

	case 5:
		ret = (!(src | dst)) ? true : false;
		break;

	default:
		ret = false;
		break;
	}

	return ret;
}

/*******************************************************
Function:
	Comfirm function.
Input:
  None.
Output:
	Return write length.
********************************************************/
static u8 comfirm(void)
{
	s32 i = 0;
	u8 buf[32];

	/*    memcpy(&buf[GTP_ADDR_LENGTH - cmd_head.addr_len],
		&cmd_head.flag_addr, cmd_head.addr_len); */
	/*    memcpy(buf, &cmd_head.flag_addr, cmd_head.addr_len);
		//Modified by Scott, 2012-02-17 */
	memcpy(buf, cmd_head.flag_addr, cmd_head.addr_len);

	for (i = 0; i < cmd_head.times; i++) {
		if (tool_i2c_read(buf, 1) <= 0) {
			GTP_ERROR("Read flag data failed!");
			return FAIL;
		}
		if (true ==
		    relation(buf[GTP_ADDR_LENGTH], cmd_head.flag_val,
			     cmd_head.flag_relation)) {
			GTP_DEBUG("value at flag addr:0x%02x.",
				  buf[GTP_ADDR_LENGTH]);
			GTP_DEBUG("flag value:0x%02x.", cmd_head.flag_val);
			break;
		}

		msleep(cmd_head.circle);
	}

	if (i >= cmd_head.times) {
		GTP_ERROR("Didn't get the flag to continue!");
		return FAIL;
	}

	return SUCCESS;
}

/*******************************************************
Function:
	Goodix tool write function.
Input:
  standard proc write function param.
Output:
	Return write length.
********************************************************/
static s32 goodix_tool_write(struct file *filp, const char __user *buff,
			     unsigned long len, void *data)
{
	s32 ret = 0;
	GTP_DEBUG_FUNC();
	GTP_DEBUG_ARRAY((u8 *)buff, len);

	ret = copy_from_user(&cmd_head, buff, CMD_HEAD_LENGTH);
	if (ret)
		GTP_ERROR("copy_from_user failed.");

	GTP_DEBUG("wr  :0x%02x.", cmd_head.wr);
	GTP_DEBUG("flag:0x%02x.", cmd_head.flag);
	GTP_DEBUG("flag addr:0x%02x%02x.", cmd_head.flag_addr[0],
		  cmd_head.flag_addr[1]);
	GTP_DEBUG("flag val:0x%02x.", cmd_head.flag_val);
	GTP_DEBUG("flag rel:0x%02x.", cmd_head.flag_relation);
	GTP_DEBUG("circle  :%d.", (s32) cmd_head.circle);
	GTP_DEBUG("times   :%d.", (s32) cmd_head.times);
	GTP_DEBUG("retry   :%d.", (s32) cmd_head.retry);
	GTP_DEBUG("delay   :%d.", (s32) cmd_head.delay);
	GTP_DEBUG("data len:%d.", (s32) cmd_head.data_len);
	GTP_DEBUG("addr len:%d.", (s32) cmd_head.addr_len);
	GTP_DEBUG("addr:0x%02x%02x.", cmd_head.addr[0], cmd_head.addr[1]);
	GTP_DEBUG("len:%d.", (s32) len);
	GTP_DEBUG("buf[20]:0x%02x.", buff[CMD_HEAD_LENGTH]);

	if (1 == cmd_head.wr) {
		/*copy_from_user(&cmd_head.data[cmd_head.addr_len],
			&buff[CMD_HEAD_LENGTH], cmd_head.data_len); */
		ret =
		    copy_from_user(&cmd_head.data[GTP_ADDR_LENGTH],
				   &buff[CMD_HEAD_LENGTH], cmd_head.data_len);
		if (ret)
			GTP_ERROR("copy_from_user failed.");
		memcpy(&cmd_head.data[GTP_ADDR_LENGTH - cmd_head.addr_len],
		       cmd_head.addr, cmd_head.addr_len);

		GTP_DEBUG_ARRAY(cmd_head.data,
				cmd_head.data_len + cmd_head.addr_len);
		GTP_DEBUG_ARRAY((u8 *)&buff[CMD_HEAD_LENGTH],
				cmd_head.data_len);

		if (1 == cmd_head.flag) {
			if (FAIL == comfirm()) {
				GTP_ERROR("[WRITE]Comfirm fail!");
				return FAIL;
			}
		} else if (2 == cmd_head.flag) {
			/* Need interrupt! */
		}
		if (tool_i2c_write
		    (&cmd_head.data[GTP_ADDR_LENGTH - cmd_head.addr_len],
		     cmd_head.data_len + cmd_head.addr_len) <= 0) {
			GTP_ERROR("[WRITE]Write data failed!");
			return FAIL;
		}

		GTP_DEBUG_ARRAY(&cmd_head.
				data[GTP_ADDR_LENGTH - cmd_head.addr_len],
				cmd_head.data_len + cmd_head.addr_len);
		if (cmd_head.delay)
			msleep(cmd_head.delay);

		return cmd_head.data_len + CMD_HEAD_LENGTH;
	} else if (3 == cmd_head.wr) { /* Write ic type */
		ret =
		    copy_from_user(&cmd_head.data[0], &buff[CMD_HEAD_LENGTH],
				   cmd_head.data_len);
		if (ret)
			GTP_ERROR("copy_from_user failed.");
		memcpy(IC_TYPE, cmd_head.data, cmd_head.data_len);

		register_i2c_func();

		return cmd_head.data_len + CMD_HEAD_LENGTH;
	} else if (5 == cmd_head.wr) {
		/* memcpy(IC_TYPE, cmd_head.data, cmd_head.data_len); */

		return cmd_head.data_len + CMD_HEAD_LENGTH;
	} else if (7 == cmd_head.wr) { /* disable irq! */
		gtp_irq_disable(i2c_get_clientdata(gt_client));

		return CMD_HEAD_LENGTH;
	} else if (9 == cmd_head.wr) { /* enable irq! */
		gtp_irq_enable(i2c_get_clientdata(gt_client));

		return CMD_HEAD_LENGTH;
	} else if (17 == cmd_head.wr) {
		struct goodix_ts_data *ts = i2c_get_clientdata(gt_client);
		ret =
		    copy_from_user(&cmd_head.data[GTP_ADDR_LENGTH],
				   &buff[CMD_HEAD_LENGTH], cmd_head.data_len);
		if (ret)
			GTP_DEBUG("copy_from_user failed.");
		if (cmd_head.data[GTP_ADDR_LENGTH]) {
			GTP_DEBUG("gtp enter rawdiff.");
			ts->gtp_rawdiff_mode = true;
		} else {
			ts->gtp_rawdiff_mode = false;
			GTP_DEBUG("gtp leave rawdiff.");
		}
		return CMD_HEAD_LENGTH;
	}
#ifdef UPDATE_FUNCTIONS
	else if (11 == cmd_head.wr) { /* Enter update mode! */
		if (FAIL == gup_enter_update_mode(gt_client))
			return FAIL;
	} else if (13 == cmd_head.wr) { /* Leave update mode! */
		gup_leave_update_mode();
	} else if (15 == cmd_head.wr) { /* Update firmware! */
		show_len = 0;
		total_len = 0;
		memset(cmd_head.data, 0, cmd_head.data_len + 1);
		memcpy(cmd_head.data, &buff[CMD_HEAD_LENGTH],
		       cmd_head.data_len);

		if (FAIL == gup_update_proc((void *)cmd_head.data))
			return FAIL;
	}
#endif

	return CMD_HEAD_LENGTH;
}

/*******************************************************
Function:
	Goodix tool read function.
Input:
  standard proc read function param.
Output:
	Return read length.
********************************************************/
static s32 goodix_tool_read(char *page, char **start, off_t off, int count,
			    int *eof, void *data)
{
	GTP_DEBUG_FUNC();

	if (cmd_head.wr % 2) {
		return FAIL;
	} else if (!cmd_head.wr) {
		u16 len = 0;
		s16 data_len = 0;
		u16 loc = 0;

		if (1 == cmd_head.flag) {
			if (FAIL == comfirm()) {
				GTP_ERROR("[READ]Comfirm fail!");
				return FAIL;
			}
		} else if (2 == cmd_head.flag) {
			/* Need interrupt! */
		}

		memcpy(cmd_head.data, cmd_head.addr, cmd_head.addr_len);

		GTP_DEBUG("[CMD HEAD DATA] ADDR:0x%02x%02x.", cmd_head.data[0],
			  cmd_head.data[1]);
		GTP_DEBUG("[CMD HEAD ADDR] ADDR:0x%02x%02x.", cmd_head.addr[0],
			  cmd_head.addr[1]);

		if (cmd_head.delay)
			msleep(cmd_head.delay);

		data_len = cmd_head.data_len;
		while (data_len > 0) {
			if (data_len > DATA_LENGTH)
				len = DATA_LENGTH;
			else
				len = data_len;
			data_len -= DATA_LENGTH;

			if (tool_i2c_read(cmd_head.data, len) <= 0) {
				GTP_ERROR("[READ]Read data failed!");
				return FAIL;
			}
			memcpy(&page[loc], &cmd_head.data[GTP_ADDR_LENGTH],
			       len);
			loc += len;

			GTP_DEBUG_ARRAY(&cmd_head.data[GTP_ADDR_LENGTH], len);
			GTP_DEBUG_ARRAY(page, len);
		}
	} else if (2 == cmd_head.wr) {
		/*    memcpy(page, "gt8", cmd_head.data_len);
			  memcpy(page, "GT818", 5);
			  page[5] = 0;
		 */

		GTP_DEBUG("Return ic type:%s len:%d.", page,
			  (s32) cmd_head.data_len);
		return cmd_head.data_len;
		/* return sizeof(IC_TYPE_NAME); */
	} else if (4 == cmd_head.wr) {
		page[0] = show_len >> 8;
		page[1] = show_len & 0xff;
		page[2] = total_len >> 8;
		page[3] = total_len & 0xff;

		return cmd_head.data_len;
	} else if (6 == cmd_head.wr) {
		/* Read error code! */
	} else if (8 == cmd_head.wr) {/* Read driver version */
		/* memcpy(page, GTP_DRIVER_VERSION,
		strlen(GTP_DRIVER_VERSION)); */

		s32 tmp_len;
		tmp_len = strlen(GTP_DRIVER_VERSION);
		memcpy(page, GTP_DRIVER_VERSION, tmp_len);
		page[tmp_len] = 0;
	}

	return cmd_head.data_len;
}