drivers/staging/fbtft/fb

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This source file includes following definitions.
init_display
set_addr_win
set_var
set_gamma
   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * FB driver for the ILI9341 LCD display controller
   4  *
   5  * This display uses 9-bit SPI: Data/Command bit + 8 data bits
   6  * For platforms that doesn't support 9-bit, the driver is capable
   7  * of emulating this using 8-bit transfer.
   8  * This is done by transferring eight 9-bit words in 9 bytes.
   9  *
  10  * Copyright (C) 2013 Christian Vogelgsang
  11  * Based on adafruit22fb.c by Noralf Tronnes
  12  */
  13 
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <video/mipi_display.h>
  19 
  20 #include "fbtft.h"
  21 
  22 #define DRVNAME         "fb_ili9341"
  23 #define WIDTH           240
  24 #define HEIGHT          320
  25 #define TXBUFLEN        (4 * PAGE_SIZE)
  26 #define DEFAULT_GAMMA   "1F 1A 18 0A 0F 06 45 87 32 0A 07 02 07 05 00\n" \
  27                         "00 25 27 05 10 09 3A 78 4D 05 18 0D 38 3A 1F"
  28 
  29 static int init_display(struct fbtft_par *par)
  30 {
  31         par->fbtftops.reset(par);
  32 
  33         /* startup sequence for MI0283QT-9A */
  34         write_reg(par, MIPI_DCS_SOFT_RESET);
  35         mdelay(5);
  36         write_reg(par, MIPI_DCS_SET_DISPLAY_OFF);
  37         /* --------------------------------------------------------- */
  38         write_reg(par, 0xCF, 0x00, 0x83, 0x30);
  39         write_reg(par, 0xED, 0x64, 0x03, 0x12, 0x81);
  40         write_reg(par, 0xE8, 0x85, 0x01, 0x79);
  41         write_reg(par, 0xCB, 0x39, 0X2C, 0x00, 0x34, 0x02);
  42         write_reg(par, 0xF7, 0x20);
  43         write_reg(par, 0xEA, 0x00, 0x00);
  44         /* ------------power control-------------------------------- */
  45         write_reg(par, 0xC0, 0x26);
  46         write_reg(par, 0xC1, 0x11);
  47         /* ------------VCOM --------- */
  48         write_reg(par, 0xC5, 0x35, 0x3E);
  49         write_reg(par, 0xC7, 0xBE);
  50         /* ------------memory access control------------------------ */
  51         write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); /* 16bit pixel */
  52         /* ------------frame rate----------------------------------- */
  53         write_reg(par, 0xB1, 0x00, 0x1B);
  54         /* ------------Gamma---------------------------------------- */
  55         /* write_reg(par, 0xF2, 0x08); */ /* Gamma Function Disable */
  56         write_reg(par, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
  57         /* ------------display-------------------------------------- */
  58         write_reg(par, 0xB7, 0x07); /* entry mode set */
  59         write_reg(par, 0xB6, 0x0A, 0x82, 0x27, 0x00);
  60         write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
  61         mdelay(100);
  62         write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
  63         mdelay(20);
  64 
  65         return 0;
  66 }
  67 
  68 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
  69 {
  70         write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
  71                   (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
  72 
  73         write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
  74                   (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
  75 
  76         write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
  77 }
  78 
  79 #define MEM_Y   BIT(7) /* MY row address order */
  80 #define MEM_X   BIT(6) /* MX column address order */
  81 #define MEM_V   BIT(5) /* MV row / column exchange */
  82 #define MEM_L   BIT(4) /* ML vertical refresh order */
  83 #define MEM_H   BIT(2) /* MH horizontal refresh order */
  84 #define MEM_BGR (3) /* RGB-BGR Order */
  85 static int set_var(struct fbtft_par *par)
  86 {
  87         switch (par->info->var.rotate) {
  88         case 0:
  89                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
  90                           MEM_X | (par->bgr << MEM_BGR));
  91                 break;
  92         case 270:
  93                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
  94                           MEM_V | MEM_L | (par->bgr << MEM_BGR));
  95                 break;
  96         case 180:
  97                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
  98                           MEM_Y | (par->bgr << MEM_BGR));
  99                 break;
 100         case 90:
 101                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
 102                           MEM_Y | MEM_X | MEM_V | (par->bgr << MEM_BGR));
 103                 break;
 104         }
 105 
 106         return 0;
 107 }
 108 
 109 /*
 110  * Gamma string format:
 111  *  Positive: Par1 Par2 [...] Par15
 112  *  Negative: Par1 Par2 [...] Par15
 113  */
 114 #define CURVE(num, idx)  curves[(num) * par->gamma.num_values + (idx)]
 115 static int set_gamma(struct fbtft_par *par, u32 *curves)
 116 {
 117         int i;
 118 
 119         for (i = 0; i < par->gamma.num_curves; i++)
 120                 write_reg(par, 0xE0 + i,
 121                           CURVE(i, 0), CURVE(i, 1), CURVE(i, 2),
 122                           CURVE(i, 3), CURVE(i, 4), CURVE(i, 5),
 123                           CURVE(i, 6), CURVE(i, 7), CURVE(i, 8),
 124                           CURVE(i, 9), CURVE(i, 10), CURVE(i, 11),
 125                           CURVE(i, 12), CURVE(i, 13), CURVE(i, 14));
 126 
 127         return 0;
 128 }
 129 
 130 #undef CURVE
 131 
 132 static struct fbtft_display display = {
 133         .regwidth = 8,
 134         .width = WIDTH,
 135         .height = HEIGHT,
 136         .txbuflen = TXBUFLEN,
 137         .gamma_num = 2,
 138         .gamma_len = 15,
 139         .gamma = DEFAULT_GAMMA,
 140         .fbtftops = {
 141                 .init_display = init_display,
 142                 .set_addr_win = set_addr_win,
 143                 .set_var = set_var,
 144                 .set_gamma = set_gamma,
 145         },
 146 };
 147 
 148 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9341", &display);
 149 
 150 MODULE_ALIAS("spi:" DRVNAME);
 151 MODULE_ALIAS("platform:" DRVNAME);
 152 MODULE_ALIAS("spi:ili9341");
 153 MODULE_ALIAS("platform:ili9341");
 154 
 155 MODULE_DESCRIPTION("FB driver for the ILI9341 LCD display controller");
 156 MODULE_AUTHOR("Christian Vogelgsang");
 157 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/staging/fbtft/fb_ili9341.c

DEFINITIONS
