/*
 * Driver for the Himax HX-8357 LCD Controller
 *
 * Copyright 2012 Free Electrons
 *
 * Licensed under the GPLv2 or later.
 */

#include <linux/delay.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/spi/spi.h>
#include <linux/sysfs.h>

#include "mxc_dispdrv.h"

#define xstr(s) str(s)
#define str(s) #s

#define HX8357_NUM_IM_PINS	3

#define HX8357_SWRESET			0x01
#define HX8357_GET_RED_CHANNEL		0x06
#define HX8357_GET_GREEN_CHANNEL	0x07
#define HX8357_GET_BLUE_CHANNEL		0x08
#define HX8357_GET_POWER_MODE		0x0a
#define HX8357_POWER_MODE_DISP_ON	0x04
#define HX8357_POWER_MODE_NORMAL	0x08
#define HX8357_POWER_MODE_AWAKE		0x10
#define HX8357_GET_MADCTL			0x0b
#define HX8357_GET_PIXEL_FORMAT		0x0c
#define HX8357_GET_DISPLAY_MODE		0x0d
#define HX8357_GET_SIGNAL_MODE		0x0e
#define HX8357_GET_DIAGNOSTIC_RESULT	0x0f
#define HX8357_ENTER_SLEEP_MODE		0x10
#define HX8357_EXIT_SLEEP_MODE		0x11
#define HX8357_ENTER_PARTIAL_MODE	0x12
#define HX8357_ENTER_NORMAL_MODE	0x13
#define HX8357_EXIT_INVERSION_MODE	0x20
#define HX8357_ENTER_INVERSION_MODE	0x21
#define HX8357_SET_DISPLAY_OFF		0x28
#define HX8357_SET_DISPLAY_ON		0x29
#define HX8357_SET_COLUMN_ADDRESS	0x2a
#define HX8357_SET_PAGE_ADDRESS		0x2b
#define HX8357_WRITE_MEMORY_START	0x2c
#define HX8357_READ_MEMORY_START	0x2e
#define HX8357_SET_PARTIAL_AREA		0x30
#define HX8357_SET_SCROLL_AREA		0x33
#define HX8357_SET_TEAR_OFF		0x34
#define HX8357_SET_TEAR_ON		0x35
#define HX8357_SET_ADDRESS_MODE		0x36
#define HX8357_SET_SCROLL_START		0x37
#define HX8357_EXIT_IDLE_MODE		0x38
#define HX8357_ENTER_IDLE_MODE		0x39
#define HX8357_SET_PIXEL_FORMAT		0x3a
#define HX8357_SET_PIXEL_FORMAT_DBI_3BIT	(0x1)
#define HX8357_SET_PIXEL_FORMAT_DBI_16BIT	(0x5)
#define HX8357_SET_PIXEL_FORMAT_DBI_18BIT	(0x6)
#define HX8357_SET_PIXEL_FORMAT_DBI_24BIT	(0x7)
#define HX8357_SET_PIXEL_FORMAT_DPI_3BIT	(0x1 << 4)
#define HX8357_SET_PIXEL_FORMAT_DPI_16BIT	(0x5 << 4)
#define HX8357_SET_PIXEL_FORMAT_DPI_18BIT	(0x6 << 4)
#define HX8357_SET_PIXEL_FORMAT_DPI_24BIT	(0x7 << 4)
#define HX8357_WRITE_MEMORY_CONTINUE	0x3c
#define HX8357_READ_MEMORY_CONTINUE	0x3e
#define HX8357_SET_TEAR_SCAN_LINES	0x44
#define HX8357_GET_SCAN_LINES		0x45
#define HX8357_READ_DDB_START		0xa1
#define HX8357_SET_DISPLAY_MODE		0xb4
#define HX8357_SET_DISPLAY_MODE_RGB_THROUGH	(0x3)
#define HX8357_SET_DISPLAY_MODE_RGB_INTERFACE	(1 << 4)
#define HX8357_SET_PANEL_DRIVING	0xc0
#define HX8357_SET_DISPLAY_FRAME	0xc5
#define HX8357_SET_RGB			0xc6
#define HX8357_SET_RGB_ENABLE_HIGH		(1 << 1)
#define HX8357_SET_GAMMA		0xc8
#define HX8357_SET_POWER		0xd0
#define HX8357_SET_VCOM			0xd1
#define HX8357_SET_POWER_NORMAL		0xd2
#define HX8357_SET_PANEL_RELATED	0xe9

#define HX8369_NOOP				0x00
#define HX8369_DISPLAY_ID					0x69
#define HX8369_SET_DISPLAY_BRIGHTNESS		0x51
#define HX8369_WRITE_CABC_DISPLAY_VALUE		0x53
#define HX8369_WRITE_CABC_BRIGHT_CTRL		0x55
#define HX8369_WRITE_CABC_MIN_BRIGHTNESS	0x5e
#define HX8369_SET_OSC						0xb0
#define HX8369_SET_OSC_LEN					2
#define HX8369_SET_POWER					0xb1
#define HX8369_SET_POWER_LEN				20
#define HX8369_SET_DISPLAY_MODE				0xb2
#define HX8369_SET_DISPLAY_MODE_LEN			16
#define HX8369_SET_RGB_INTERFACE			0xb3
#define HX8369_SET_RGB_INTERFACE_LEN		3
#define HX8369_SET_DISPLAY_WAVEFORM_CYC		0xb4
#define HX8369_SET_DISPLAY_WAVEFORM_CYC_LEN	6
#define HX8369_SET_VCOM						0xb6
#define HX8369_SET_VCOM_LEN					3
#define HX8369_SET_DCDC_FDBK_CTRL		0xbf /* Undocumented, from Vendor */
#define HX8369_SET_DCDC_FDBK_CTRL_LEN		2
#define HX8369_SET_EXTENSION_COMMAND		0xb9
#define HX8369_SET_EXTENSION_COMMAND_LEN	4
#define HX8369_SET_PANEL					0xcc
#define HX8369_SET_PANEL_LEN				2
#define HX8369_SET_GIP						0xd5
#define HX8369_SET_GIP_LEN					27
#define HX8369_SET_GAMMA_CURVE_RELATED		0xe0
#define HX8369_SET_GAMMA_CURVE_RELATED_LEN	35
#define HX8369_GET_HXID						0xF4
#define HX8369_GET_POWER_MODE				0x0A
#define HX8369_READ_ID(x)					(0xDA + (x))

struct hx8357_data {
	struct mxc_dispdrv_driver driver;
	struct mxc_dispdrv_handle *handle;
	unsigned		im_pins[HX8357_NUM_IM_PINS];
	unsigned		reset;
	struct spi_device	*spi;
	int			state;
	int			pre_suspend_state;
	bool			use_im_pins;
	int (*init)(struct hx8357_data* lcd);
	struct fb_info *fbi;
	struct device dev;
};

#define HX8369_NUM_DISPLAY_TYPES	3
#define HX8369_FALLBACK_TYPE (HX8369_NUM_DISPLAY_TYPES - 1)

enum {
	DISPLAY_ID_TIANMA = 0,
	DISPLAY_ID_WINTEK,
	DISPLAY_ID_LG
} display_id;

static const uint32_t hx8369_display_ids[HX8369_NUM_DISPLAY_TYPES] = {
	0x000011, /* tianma TM040YDHP09 480x800 */
	0x232221,  /* wintek form factor */
	0x000021, /* LG Form Factor */
};

static const u8 hx8357_seq_power[] = {
	HX8357_SET_POWER, 0x44, 0x41, 0x06,
};

static const u8 hx8357_seq_vcom[] = {
	HX8357_SET_VCOM, 0x40, 0x10,
};

static const u8 hx8357_seq_power_normal[] = {
	HX8357_SET_POWER_NORMAL, 0x05, 0x12,
};

static const u8 hx8357_seq_panel_driving[] = {
	HX8357_SET_PANEL_DRIVING, 0x14, 0x3b, 0x00, 0x02, 0x11,
};

static const u8 hx8357_seq_display_frame[] = {
	HX8357_SET_DISPLAY_FRAME, 0x0c,
};

static const u8 hx8357_seq_panel_related[] = {
	HX8357_SET_PANEL_RELATED, 0x01,
};

static const u8 hx8357_seq_undefined1[] = {
	0xea, 0x03, 0x00, 0x00,
};

static const u8 hx8357_seq_undefined2[] = {
	0xeb, 0x40, 0x54, 0x26, 0xdb,
};

static const u8 hx8357_seq_gamma[] = {
	HX8357_SET_GAMMA, 0x00, 0x15, 0x00, 0x22, 0x00,
	0x08, 0x77, 0x26, 0x77, 0x22, 0x04, 0x00,
};

static const u8 hx8357_seq_address_mode[] = {
	HX8357_SET_ADDRESS_MODE, 0xc0,
};

static const u8 hx8357_seq_pixel_format[] = {
	HX8357_SET_PIXEL_FORMAT,
	HX8357_SET_PIXEL_FORMAT_DPI_24BIT |
	HX8357_SET_PIXEL_FORMAT_DBI_24BIT,
};

static const u8 hx8357_seq_column_address[] = {
	HX8357_SET_COLUMN_ADDRESS, 0x00, 0x00, 0x01, 0xdf,
};

static const u8 hx8357_seq_page_address[] = {
	HX8357_SET_PAGE_ADDRESS, 0x00, 0x00, 0x03, 0x1f,
};

static const u8 hx8357_seq_rgb[] = {
	HX8357_SET_RGB, 0x02,
};

static const u8 hx8357_seq_display_mode[] = {
	HX8357_SET_DISPLAY_MODE,
	HX8357_SET_DISPLAY_MODE_RGB_THROUGH |
	HX8357_SET_DISPLAY_MODE_RGB_INTERFACE,
};

static const u8 hx8369_seq_extension_command[HX8369_SET_EXTENSION_COMMAND_LEN] = {
	HX8369_SET_EXTENSION_COMMAND, 0xff, 0x83, 0x69,
};

static const u8 hx8369_seq_display_related[HX8369_NUM_DISPLAY_TYPES][HX8369_SET_DISPLAY_MODE_LEN] = {
{
	HX8369_SET_DISPLAY_MODE,
	0x00,/*d[1:0] --Operate (display)*/
	0x3b,/*RES_SEL=b010 RM=1 DFR=0 DM=01 480x640 RGB DPI*/
	0x04,/*bp=6*/
	0x04,/*fp=6*/
	0xF0,/*sap=b0111 4u fixed current*/
	0x00,/*GEN_ON*/
	0xFF,/*GEN_OFF*/
	0x00,/*RTN*/
	0x00,/*TEI*/
	0x00,/*TEP*/
	0x00,/*TEP*/
	0x04,/*BP_PE=6*/
	0x04,/*FP_PE=6*/
	0x00,/*RTN_PE*/
	0x01,/*GON=1*/
},
{
	HX8369_SET_DISPLAY_MODE,
        0x00, 0x33, 0x03, 0x03, 0x70, 0x00, 0xFF,
        0x06, 0x00, 0x00, 0x00, 0x03, 0x03, 0x00, 0x01,
},
{
	HX8369_SET_DISPLAY_MODE,
	0x00, 0x33, 0x03, 0x03, 0x70, 0x00, 0xFF,
	0x00, 0x00, 0x00, 0x00, 0x03, 0x03, 0x00, 0x01,
},
};

static const u8 hx8369_seq_panel_waveform_cycle[HX8369_NUM_DISPLAY_TYPES][HX8369_SET_DISPLAY_WAVEFORM_CYC_LEN] = {
{
	HX8369_SET_DISPLAY_WAVEFORM_CYC, 0x0a, 0x1d, 0x80, 0x00, 0x00,
},
{
	 HX8369_SET_DISPLAY_WAVEFORM_CYC, 0x00, 0x1c, 0x84, 0x06, 0x02,
},
{
	HX8369_SET_DISPLAY_WAVEFORM_CYC, 0x0A, 0x1D, 0x69, 0x0E, 0x06,
},
};

static const u8 hx8369_seq_set_address_mode[] = {
	HX8357_SET_ADDRESS_MODE, 0x08,
};

static const u8 hx8369_seq_vcom[HX8369_NUM_DISPLAY_TYPES][HX8369_SET_VCOM_LEN] = {{
	HX8369_SET_VCOM, 0x3F, 0x3F,
},
{
	HX8369_SET_VCOM, 0x3c, 0x3c,
},
{
	HX8369_SET_VCOM, 0x31, 0x31,
},
};

static const u8 hx8369_seq_panel[HX8369_SET_PANEL_LEN] = {
	HX8369_SET_PANEL, 0x02,
};


static const u8 hx8369_seq_gip[HX8369_NUM_DISPLAY_TYPES][HX8369_SET_GIP_LEN] = {{
	HX8369_SET_GIP, 0x00, 0x01, 0x03, 0x34, 0x01, 0x05, 0x00, 0x70,
	0x11, 0x13, 0x00, 0x00, 0x60, 0x24, 0x71, 0x35, 0x00, 0x00, 0x73,
	0x05, 0x62, 0x14, 0x07, 0x0f, 0x04, 0x04,
},
{
	HX8369_SET_GIP, 0x00, 0x08, 0x03, 0x00, 0x01, 0x0A, 0x00, 0x85,
        0x11, 0x13, 0x00, 0x01, 0x00, 0x64, 0x00, 0x75, 0x01, 0x00, 0x44,
        0x57, 0x44, 0x46, 0x07, 0x0F, 0x02, 0x03,
},
{
	HX8369_SET_GIP, 0x00, 0x04, 0x00, 0x00, 0x01, 0x04, 0x28, 0x98,
	0x33, 0x37, 0x02, 0x31, 0x46, 0x8A, 0x57, 0x9B, 0x00, 0x00, 0x73,
	0x15, 0x61, 0x04, 0x07, 0x0F, 0x04, 0x00,
},
};

static const u8 hx8369_seq_osc[HX8369_SET_OSC_LEN] = {
	HX8369_SET_OSC, 0x01,
};
static const u8 hx8369_seq_power[HX8369_NUM_DISPLAY_TYPES][HX8369_SET_POWER_LEN] = {
{
	HX8369_SET_POWER, 0x01, 0x00, 0x34, 0x0A, 0x00, 0x11, 0x11, 0x2f,
	0x37, 0x3f, 0x3f, 0x01, 0x22, 0x01, 0xe6, 0xe6, 0xe6, 0xe6, 0xe6,
},
{
	HX8369_SET_POWER, 0x01, 0x00, 0x34, 0x07, 0x00, 0x10, 0x10, 0x22,
	 0x32, 0x3F, 0x3F, 0x07, 0x23, 0x01, 0xE6, 0xE6, 0xE6, 0xE6, 0xE6,
},
{
	HX8369_SET_POWER, 0x01, 0x00, 0x54, 0x0B, 0x00, 0x0F, 0x0F, 0x34,
	0x3C, 0x3F, 0x3F, 0x07, 0x22, 0x01, 0xE6, 0xE6, 0xE6, 0xE6, 0xE6,
},
};

static const u8 hx8369_seq_dcdc_fdbk_ctrl[HX8369_NUM_DISPLAY_TYPES][HX8369_SET_DCDC_FDBK_CTRL_LEN] = {
	{
		HX8369_NOOP,
	},
	{
		HX8369_NOOP,
	},
	{
		HX8369_SET_DCDC_FDBK_CTRL, 0x70,
	},
};

static const u8 hx8369_seq_gamma_curve_related[HX8369_NUM_DISPLAY_TYPES][HX8369_SET_GAMMA_CURVE_RELATED_LEN] = {
	{
		HX8369_SET_GAMMA_CURVE_RELATED, 0x10, 0x1a, 0x26, 0x2a, 0x2b, 0x2f,
		0x33, 0x4b, 0x04, 0x0a, 0x0e, 0x13, 0x15, 0x14, 0x14, 0x13, 0x15,
		0x10, 0x1b, 0x26, 0x2a, 0x2b, 0x2f, 0x33, 0x4a, 0x00, 0x0a, 0x0e,
		0x14, 0x16, 0x14, 0x14, 0x12, 0x18,

	},
	{
		HX8369_SET_GAMMA_CURVE_RELATED, 0x00, 0x1A, 0x20, 0x37, 0x3B, 0x3F,
		0x2F, 0x4D, 0x07, 0x0D, 0x0F, 0x12, 0x14, 0x12, 0x14, 0x10, 0x18,
		0x00, 0x19, 0x21, 0x38, 0x3B, 0x3F, 0x2F, 0x4C, 0x06, 0x0D, 0x0E,
		0x12, 0x14, 0x14, 0x14, 0x11, 0x17,
	},
	{
		HX8369_SET_GAMMA_CURVE_RELATED, 0x00, 0x0D, 0x0F, 0x2F, 0x32, 0x3E,
		0x1D, 0x3C, 0x09, 0x0E, 0x0D, 0x10, 0x12, 0x11, 0x12, 0x11, 0x18,
		0x00, 0x0D, 0x0F, 0x2F, 0x32, 0x3E, 0x1D, 0x3C, 0x09, 0x0E, 0x0D,
		0x10, 0x12, 0x11, 0x12, 0x11, 0x18,
	},
};

static int hx8357_spi_write_then_read(struct hx8357_data *lcd,
				u8 *txbuf, u16 txlen,
				u8 *rxbuf, u16 rxlen)
{
	struct spi_message msg;
	struct spi_transfer xfer[2];
	u16 *local_txbuf = NULL;
	int ret = 0;

	memset(xfer, 0, sizeof(xfer));
	spi_message_init(&msg);

	if (txlen) {
		int i;

		local_txbuf = kcalloc(txlen, sizeof(*local_txbuf), GFP_KERNEL);

		if (!local_txbuf)
			return -ENOMEM;

		for (i = 0; i < txlen; i++) {
			local_txbuf[i] = txbuf[i];
			if (i > 0)
				local_txbuf[i] |= 1 << 8;
		}

		xfer[0].len = 2 * txlen;
		xfer[0].bits_per_word = 9;
		xfer[0].tx_buf = local_txbuf;
		spi_message_add_tail(&xfer[0], &msg);
	}

	if (rxlen) {
		xfer[1].len = rxlen;
		xfer[1].bits_per_word = 8;
		xfer[1].rx_buf = rxbuf;
		spi_message_add_tail(&xfer[1], &msg);
	}

	ret = spi_sync(lcd->spi, &msg);
	if (ret < 0)
		dev_err(&lcd->dev, "Couldn't send SPI data\n");

	if (txlen)
		kfree(local_txbuf);

	return ret;
}

static inline int hx8357_spi_write_array(struct hx8357_data *lcd,
					u8 *value, u8 len)
{
	return hx8357_spi_write_then_read(lcd, value, len, NULL, 0);
}

static inline int hx8357_spi_write_byte(struct hx8357_data *lcd,
					u8 value)
{
	return hx8357_spi_write_then_read(lcd, &value, 1, NULL, 0);
}

static uint32_t hx8369_get_cmd(struct hx8357_data *lcd, u8 command)
{
	u8 reg[2] = {0xFE, command};
	u8 cmd = 0xff;
	u8 buf = 0;

	hx8357_spi_write_array(lcd, reg, 2);
	hx8357_spi_write_then_read(lcd, &cmd, 1, &buf, 1);
	return (uint32_t) buf;
};

static uint32_t hx8369_read_hxid(struct hx8357_data *lcd)
{
	return hx8369_get_cmd(lcd, HX8369_GET_HXID);
};

static int hx8357_enter_standby(struct hx8357_data *lcd)
{
	int ret = 0 ;


	/*
	 * Controller must wait minimum 120 msec between exit_sleep and
	 * enter sleep.
	 */
	msleep(120);

	ret = hx8357_spi_write_byte(lcd, HX8357_SET_DISPLAY_OFF);
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_byte(lcd, HX8357_ENTER_SLEEP_MODE);
	if (ret < 0)
		return ret;

	/*
	 * The controller needs 120ms when entering in sleep mode before we can
	 * send the command to exit sleep mode. Wait now to make sure wake is fast.
	 */
	msleep(120);

	if(hx8369_read_hxid(lcd) != HX8369_DISPLAY_ID)
	{
		dev_warn(&lcd->dev, "Display mismatch after sleep. %02X\n", hx8369_read_hxid(lcd));
	}
	if(hx8369_get_cmd(lcd, HX8357_GET_POWER_MODE) != HX8357_POWER_MODE_NORMAL)
	{
		dev_warn(&lcd->dev, "reg 0a != 0x08. is %02X instead\n",hx8369_get_cmd(lcd, HX8357_GET_POWER_MODE));
	}

	return ret;
}

static int hx8357_exit_standby(struct hx8357_data *lcd)
{
	int ret = 0;

	msleep(17); //wait for at least 1 frame to ensure the pixel clock is running.

	ret = hx8357_spi_write_byte(lcd, HX8357_EXIT_SLEEP_MODE);
	if (ret < 0)
		return ret;

	/*From the manual:
	 *It takes 120msec to become Sleep Out mode after SLPOUT command issued.*/
	msleep(120);

	if(hx8369_read_hxid(lcd) != HX8369_DISPLAY_ID)
	{
		dev_warn(&lcd->dev, "Display mismatch after exit sleep. %02X\n", hx8369_read_hxid(lcd));
	}
	if(hx8369_get_cmd(lcd, HX8357_GET_POWER_MODE) != (HX8357_POWER_MODE_NORMAL | HX8357_POWER_MODE_AWAKE))
	{
		dev_warn(&lcd->dev, "reg 0a != 0x18. is %02X instead\n",hx8369_get_cmd(lcd, HX8357_GET_POWER_MODE));
	}

	if(ret == 0)
	{
		ret = hx8357_spi_write_byte(lcd, HX8357_SET_DISPLAY_ON);
	}

	msleep(10);

	if(hx8369_read_hxid(lcd) != HX8369_DISPLAY_ID)
	{
		dev_warn(&lcd->dev, "Display mismatch after display on. %02X\n", hx8369_read_hxid(lcd));
	}
	if(hx8369_get_cmd(lcd, HX8357_GET_POWER_MODE) != (HX8357_POWER_MODE_NORMAL | HX8357_POWER_MODE_AWAKE | HX8357_POWER_MODE_DISP_ON))
	{
		dev_warn(&lcd->dev, "reg 0a != 0x1C. is %02X instead\n",hx8369_get_cmd(lcd, HX8357_GET_POWER_MODE));
	}


	return ret;
}

static void hx8357_lcd_reset(struct hx8357_data *lcd)
{
	/* Reset the screen */
	gpio_set_value(lcd->reset, 1);
	usleep_range(10000, 12000);
	gpio_set_value(lcd->reset, 0);
	usleep_range(10000, 12000);
	gpio_set_value(lcd->reset, 1);

	/* The controller needs 120ms to recover from reset */
	msleep(120);
}

static uint32_t hx8369_read_disp_id(struct hx8357_data *lcd)
{
	uint32_t retval = 0;
	int i;

	for (i = 2; i >= 0; i--) {
		u8 reg[2] = {0xFE, HX8369_READ_ID(i)};
		u8 cmd = 0xff;
		u8 buf = 0;

		hx8357_spi_write_array(lcd, reg, 2);
		hx8357_spi_write_then_read(lcd, &cmd, 1, &buf, 1);
		retval = (retval << 8) | buf;
	}
	/*id2 bit 7 is always set. Clear it.*/
	retval &= ~(1 << 15);

	return retval;
}

static ssize_t show_hxid(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct hx8357_data *lcd = dev_get_drvdata(dev);

	return sprintf(buf, "%02x\n", hx8369_read_hxid(lcd));
}

static ssize_t show_panelid(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct hx8357_data *lcd = dev_get_drvdata(dev);

	return sprintf(buf, "%06x\n", hx8369_read_disp_id(lcd));
}

static DEVICE_ATTR(hxid, S_IRUGO, show_hxid, NULL);
static DEVICE_ATTR(panelid, S_IRUGO, show_panelid, NULL);

static int hx8357_lcd_init(struct hx8357_data *lcd)
{
	int ret;

	hx8357_lcd_reset(lcd);
	/*
	 * Set the interface selection pins to SPI mode, with three
	 * wires
	 */
	if (lcd->use_im_pins) {
		gpio_set_value_cansleep(lcd->im_pins[0], 1);
		gpio_set_value_cansleep(lcd->im_pins[1], 0);
		gpio_set_value_cansleep(lcd->im_pins[2], 1);
	}

	ret = hx8357_spi_write_array(lcd, hx8357_seq_power,
				ARRAY_SIZE(hx8357_seq_power));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_vcom,
				ARRAY_SIZE(hx8357_seq_vcom));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_power_normal,
				ARRAY_SIZE(hx8357_seq_power_normal));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_panel_driving,
				ARRAY_SIZE(hx8357_seq_panel_driving));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_display_frame,
				ARRAY_SIZE(hx8357_seq_display_frame));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_panel_related,
				ARRAY_SIZE(hx8357_seq_panel_related));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_undefined1,
				ARRAY_SIZE(hx8357_seq_undefined1));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_undefined2,
				ARRAY_SIZE(hx8357_seq_undefined2));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_gamma,
				ARRAY_SIZE(hx8357_seq_gamma));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_address_mode,
				ARRAY_SIZE(hx8357_seq_address_mode));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_pixel_format,
				ARRAY_SIZE(hx8357_seq_pixel_format));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_column_address,
				ARRAY_SIZE(hx8357_seq_column_address));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_page_address,
				ARRAY_SIZE(hx8357_seq_page_address));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_rgb,
				ARRAY_SIZE(hx8357_seq_rgb));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8357_seq_display_mode,
				ARRAY_SIZE(hx8357_seq_display_mode));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_byte(lcd, HX8357_EXIT_SLEEP_MODE);
	if (ret < 0)
		return ret;

	/*
	 * The controller needs 120ms to fully recover from exiting sleep mode
	 */
	msleep(120);

	ret = hx8357_spi_write_byte(lcd, HX8357_SET_DISPLAY_ON);
	if (ret < 0)
		return ret;

	usleep_range(5000, 7000);

	ret = hx8357_spi_write_byte(lcd, HX8357_WRITE_MEMORY_START);
	if (ret < 0)
		return ret;

	return 0;
}

static int hx8369_lcd_init(struct hx8357_data *lcd)
{
	int ret;
	int id;
	int panel_id;

	hx8357_lcd_reset(lcd);

	ret = hx8357_spi_write_array(lcd, hx8369_seq_extension_command,
				ARRAY_SIZE(hx8369_seq_extension_command));
	if (ret < 0)
		return ret;
	usleep_range(10000, 12000);

	dev_info(&lcd->dev, "Himax ID: %02x. should be " xstr(HX8369_DISPLAY_ID) ".\n", hx8369_read_hxid(lcd));
	panel_id = hx8369_read_disp_id(lcd);
	dev_info(&lcd->dev, "Panel ID: %06x\n", panel_id);

	for (id = 0; id < HX8369_NUM_DISPLAY_TYPES; id++) {
		if (hx8369_display_ids[id] == panel_id)
			break;
	}
	if (id == HX8369_NUM_DISPLAY_TYPES) {
		dev_warn(&lcd->dev, "Panel ID doesn't exist in table. Trying default\n");
		id = HX8369_FALLBACK_TYPE;
	}

	if (id == DISPLAY_ID_LG) {
		dev_warn(&lcd->dev, "special case, shift framebuffer by 3 pixels");
		lcd->fbi->var.upper_margin += 3;
		fb_set_var(lcd->fbi, &lcd->fbi->var);
	}

	ret = hx8357_spi_write_array(lcd, hx8369_seq_display_related[id],
				ARRAY_SIZE(hx8369_seq_display_related[id]));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8369_seq_panel_waveform_cycle[id],
				ARRAY_SIZE(hx8369_seq_panel_waveform_cycle[id]));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8369_seq_vcom[id],
				ARRAY_SIZE(hx8369_seq_vcom[id]));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8369_seq_panel,
				ARRAY_SIZE(hx8369_seq_panel));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8369_seq_gip[id],
				ARRAY_SIZE(hx8369_seq_gip[id]));
	if (ret < 0)
		return ret;


	ret = hx8357_spi_write_array(lcd, hx8369_seq_power[id],
				ARRAY_SIZE(hx8369_seq_power[id]));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8369_seq_dcdc_fdbk_ctrl[id],
				ARRAY_SIZE(hx8369_seq_dcdc_fdbk_ctrl[id]));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_array(lcd, hx8369_seq_gamma_curve_related[id],
				ARRAY_SIZE(hx8369_seq_gamma_curve_related[id]));
	if (ret < 0)
		return ret;

	ret = hx8357_spi_write_byte(lcd, HX8357_EXIT_SLEEP_MODE);
	if (ret < 0)
		return ret;

	/*
	 * The controller needs 120ms to fully recover from exiting sleep mode
	 */
	msleep(120);

	ret = hx8357_spi_write_byte(lcd, HX8357_SET_DISPLAY_ON);
	if (ret < 0)
		return ret;

	return 0;

}

#define POWER_IS_ON(pwr)	((pwr) <= FB_BLANK_NORMAL)

static int hx8357_set_power(struct hx8357_data *lcd, int power)
{
	int ret = 0;

	if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->state))
	{
		uint32_t id;
		ret = hx8357_exit_standby(lcd);
		id = hx8369_read_hxid(lcd);

		if (id != HX8369_DISPLAY_ID)
		{
			dev_err(&lcd->dev, "Version mismatch on set_power 0x%x\n", id);

			//attempt to fully re-init the panel if resume didn't work.
			ret = lcd->init(lcd);
			//reboot if that failed
			BUG_ON(ret != 0);
		}
	}
	else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->state))
		ret = hx8357_enter_standby(lcd);

	if (ret == 0)
		lcd->state = power;
	else
		dev_warn(&lcd->dev, "failed to set power mode %d\n", power);

	return ret;
}

static int hx8357_get_power(struct hx8357_data *lcd)
{
	return lcd->state;
}

static const struct of_device_id hx8357_dt_ids[] = {
	{
		.compatible = "himax,hx8357",
		.data = hx8357_lcd_init,
	},
	{
		.compatible = "himax,hx8369",
		.data = hx8369_lcd_init,
	},
	{},
};
MODULE_DEVICE_TABLE(of, hx8357_dt_ids);


int mxc_hx8357_init(struct mxc_dispdrv_handle *handle, struct mxc_dispdrv_setting *setting)
{
	int ret = -1;
	struct hx8357_data *lcd = container_of(handle->drv, struct hx8357_data, driver);

	lcd->fbi = setting->fbi;

	if(lcd->init){
		ret = lcd->init(lcd);
		if (ret) {
			dev_err(&lcd->dev, "Couldn't initialize panel\n");
		}
	}

	return ret;
}


/* display driver enable function for extension */
int mxc_hx8357_enable (struct mxc_dispdrv_handle *handle, struct fb_info *fbi)
{
	struct hx8357_data *lcd = container_of(handle->drv, struct hx8357_data, driver);
	usleep_range(1000,2000);
	return hx8357_set_power(lcd, FB_BLANK_UNBLANK);
}

/* display driver disable function, called at early part of fb_blank */
void mxc_hx8357_disable (struct mxc_dispdrv_handle *handle, struct fb_info *fbi)
{
	struct hx8357_data *lcd = container_of(handle->drv, struct hx8357_data, driver);
	hx8357_set_power(lcd, FB_BLANK_POWERDOWN);
	usleep_range(1000,2000);
}

/* display driver setup function, called at early part of fb_set_par */
int mxc_hx8357_setup (struct mxc_dispdrv_handle *handle, struct fb_info *fbi)
{
	return 0;
}


int hx8357_init(struct spi_device *spi)
{
	struct hx8357_data *lcd;
	const struct of_device_id *match;
	int i, ret;

	lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
	if (!lcd) {
		dev_err(&spi->dev, "Couldn't allocate lcd internal structure!\n");
		return -ENOMEM;
	}

	ret = spi_setup(spi);
	if (ret < 0) {
		dev_err(&spi->dev, "SPI setup failed.\n");
		return ret;
	}

	lcd->spi = spi;
	lcd->dev = spi->dev;

	match = of_match_device(hx8357_dt_ids, &spi->dev);
	if (!match || !match->data)
		return -EINVAL;

	lcd->reset = of_get_named_gpio(spi->dev.of_node, "gpios-reset", 0);
	if (!gpio_is_valid(lcd->reset)) {
		dev_err(&spi->dev, "Missing dt property: gpios-reset\n");
		return -EINVAL;
	}

	ret = devm_gpio_request_one(&spi->dev, lcd->reset,
				    GPIOF_OUT_INIT_HIGH,
				    "hx8357-reset");
	if (ret) {
		dev_err(&spi->dev,
			"failed to request gpio %d: %d\n",
			lcd->reset, ret);
		return -EINVAL;
	}

	if (of_find_property(spi->dev.of_node, "im-gpios", NULL)) {
		lcd->use_im_pins = 1;

		for (i = 0; i < HX8357_NUM_IM_PINS; i++) {
			lcd->im_pins[i] = of_get_named_gpio(spi->dev.of_node,
							    "im-gpios", i);
			if (lcd->im_pins[i] == -EPROBE_DEFER) {
				dev_info(&spi->dev, "GPIO requested is not here yet, deferring the probe\n");
				return -EPROBE_DEFER;
			}
			if (!gpio_is_valid(lcd->im_pins[i])) {
				dev_err(&spi->dev, "Missing dt property: im-gpios\n");
				return -EINVAL;
			}

			ret = devm_gpio_request_one(&spi->dev, lcd->im_pins[i],
						    GPIOF_OUT_INIT_LOW,
						    "im_pins");
			if (ret) {
				dev_err(&spi->dev, "failed to request gpio %d: %d\n",
					lcd->im_pins[i], ret);
				return -EINVAL;
			}
		}
	} else {
		lcd->use_im_pins = 0;
	}

	lcd->driver.name = "hx8357";
	lcd->driver.init = mxc_hx8357_init;
	lcd->driver.enable = mxc_hx8357_enable;
	lcd->driver.disable = mxc_hx8357_disable;
	lcd->driver.setup = mxc_hx8357_setup;

	lcd->handle = mxc_dispdrv_register(&lcd->driver);
	spi_set_drvdata(spi, lcd);

	lcd->init = match->data;

	dev_set_drvdata(&lcd->dev, lcd);

	ret = device_create_file(&lcd->dev, &dev_attr_hxid);
	if (ret) {
		dev_err(&spi->dev, "Failed to generate sys file hxid");
		goto init_error;
	}

	ret = device_create_file(&lcd->dev, &dev_attr_panelid);
	if (ret) {
		dev_err(&spi->dev, "Failed to generate sys file panelid");
		goto sysfs_exit;
	}

	dev_info(&spi->dev, "Panel probed.\n");
	return 0;

sysfs_exit:
	device_remove_file(&lcd->dev, &dev_attr_hxid);

init_error:
	mxc_dispdrv_unregister(lcd->handle);
	return ret;
}

static int hx8357_remove(struct spi_device *spi)
{
	struct hx8357_data *lcd = spi_get_drvdata(spi);
	mxc_dispdrv_unregister(lcd->handle);
	return 0;
}

static struct spi_driver hx8357_driver = {
	.probe  = hx8357_init,
	.remove = hx8357_remove,
	.driver = {
		.name = "hx8357",
		.of_match_table = of_match_ptr(hx8357_dt_ids),
	},
};
module_spi_driver(hx8357_driver);

MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Himax HX-8357 LCD Driver");
MODULE_LICENSE("GPL");