linux-imx

/*

 * (C) Copyright 2008

 * Stefano Babic, DENX Software Engineering, sbabic@denx.de.

 *

 * 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 driver implements a lcd device for the ILITEK 922x display

 * controller. The interface to the display is SPI and the display's

 * memory is cyclically updated over the RGB interface.

 */

​

#include <linux/fb.h>

#include <linux/delay.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/lcd.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/slab.h>

#include <linux/spi/spi.h>

#include <linux/string.h>

​

/* Register offset, see manual section 8.2 */

#define REG_START_OSCILLATION           0x00

#define REG_DRIVER_CODE_READ            0x00

#define REG_DRIVER_OUTPUT_CONTROL       0x01

#define REG_LCD_AC_DRIVEING_CONTROL     0x02

#define REG_ENTRY_MODE              0x03

#define REG_COMPARE_1               0x04

#define REG_COMPARE_2               0x05

#define REG_DISPLAY_CONTROL_1           0x07

#define REG_DISPLAY_CONTROL_2           0x08

#define REG_DISPLAY_CONTROL_3           0x09

#define REG_FRAME_CYCLE_CONTROL         0x0B

#define REG_EXT_INTF_CONTROL            0x0C

#define REG_POWER_CONTROL_1         0x10

#define REG_POWER_CONTROL_2         0x11

#define REG_POWER_CONTROL_3         0x12

#define REG_POWER_CONTROL_4         0x13

#define REG_RAM_ADDRESS_SET         0x21

#define REG_WRITE_DATA_TO_GRAM          0x22

#define REG_RAM_WRITE_MASK1         0x23

#define REG_RAM_WRITE_MASK2         0x24

#define REG_GAMMA_CONTROL_1         0x30

#define REG_GAMMA_CONTROL_2         0x31

#define REG_GAMMA_CONTROL_3         0x32

#define REG_GAMMA_CONTROL_4         0x33

#define REG_GAMMA_CONTROL_5         0x34

#define REG_GAMMA_CONTROL_6         0x35

#define REG_GAMMA_CONTROL_7         0x36

#define REG_GAMMA_CONTROL_8         0x37

#define REG_GAMMA_CONTROL_9         0x38

#define REG_GAMMA_CONTROL_10            0x39

#define REG_GATE_SCAN_CONTROL           0x40

#define REG_VERT_SCROLL_CONTROL         0x41

#define REG_FIRST_SCREEN_DRIVE_POS      0x42

#define REG_SECOND_SCREEN_DRIVE_POS     0x43

#define REG_RAM_ADDR_POS_H          0x44

#define REG_RAM_ADDR_POS_V          0x45

#define REG_OSCILLATOR_CONTROL          0x4F

#define REG_GPIO                0x60

#define REG_OTP_VCM_PROGRAMMING         0x61

#define REG_OTP_VCM_STATUS_ENABLE       0x62

#define REG_OTP_PROGRAMMING_ID_KEY      0x65

​

/*

 * maximum frequency for register access

 * (not for the GRAM access)

 */

#define ILITEK_MAX_FREQ_REG 4000000

​

/*

 * Device ID as found in the datasheet (supports 9221 and 9222)

 */

#define ILITEK_DEVICE_ID    0x9220

#define ILITEK_DEVICE_ID_MASK   0xFFF0

​

/* Last two bits in the START BYTE */

#define START_RS_INDEX      0

#define START_RS_REG        1

#define START_RW_WRITE      0

#define START_RW_READ       1

​

/**

 * START_BYTE(id, rs, rw)

 *

 * Set the start byte according to the required operation.

 * The start byte is defined as: