drivers/staging/fbtft/fb_s6d1121.c

   1 /*
   2  * FB driver for the S6D1121 LCD Controller
   3  *
   4  * Copyright (C) 2013 Roman Rolinsky
   5  *
   6  * Based on fb_ili9325.c by Noralf Tronnes
   7  * Based on ili9325.c by Jeroen Domburg
   8  * Init code from UTFT library by Henning Karlsen
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/gpio.h>
  25 #include <linux/delay.h>
  26
  27 #include "fbtft.h"
  28
  29 #define DRVNAME         "fb_s6d1121"
  30 #define WIDTH           240
  31 #define HEIGHT          320
  32 #define BPP             16
  33 #define FPS             20
  34 #define DEFAULT_GAMMA   "26 09 24 2C 1F 23 24 25 22 26 25 23 0D 00\n" \
  35                         "1C 1A 13 1D 0B 11 12 10 13 15 36 19 00 0D"
  36
  37 static int init_display(struct fbtft_par *par)
  38 {
  39         par->fbtftops.reset(par);
  40
  41         if (par->gpio.cs != -1)
  42                 gpio_set_value(par->gpio.cs, 0);  /* Activate chip */
  43
  44         /* Initialization sequence from Lib_UTFT */
  45
  46         write_reg(par, 0x0011, 0x2004);
  47         write_reg(par, 0x0013, 0xCC00);
  48         write_reg(par, 0x0015, 0x2600);
  49         write_reg(par, 0x0014, 0x252A);
  50         write_reg(par, 0x0012, 0x0033);
  51         write_reg(par, 0x0013, 0xCC04);
  52         write_reg(par, 0x0013, 0xCC06);
  53         write_reg(par, 0x0013, 0xCC4F);
  54         write_reg(par, 0x0013, 0x674F);
  55         write_reg(par, 0x0011, 0x2003);
  56         write_reg(par, 0x0016, 0x0007);
  57         write_reg(par, 0x0002, 0x0013);
  58         write_reg(par, 0x0003, 0x0003);
  59         write_reg(par, 0x0001, 0x0127);
  60         write_reg(par, 0x0008, 0x0303);
  61         write_reg(par, 0x000A, 0x000B);
  62         write_reg(par, 0x000B, 0x0003);
  63         write_reg(par, 0x000C, 0x0000);
  64         write_reg(par, 0x0041, 0x0000);
  65         write_reg(par, 0x0050, 0x0000);
  66         write_reg(par, 0x0060, 0x0005);
  67         write_reg(par, 0x0070, 0x000B);
  68         write_reg(par, 0x0071, 0x0000);
  69         write_reg(par, 0x0078, 0x0000);
  70         write_reg(par, 0x007A, 0x0000);
  71         write_reg(par, 0x0079, 0x0007);
  72         write_reg(par, 0x0007, 0x0051);
  73         write_reg(par, 0x0007, 0x0053);
  74         write_reg(par, 0x0079, 0x0000);
  75
  76         write_reg(par, 0x0022); /* Write Data to GRAM */
  77
  78         return 0;
  79 }
  80
  81 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
  82 {
  83         switch (par->info->var.rotate) {
  84         /* R20h = Horizontal GRAM Start Address */
  85         /* R21h = Vertical GRAM Start Address */
  86         case 0:
  87                 write_reg(par, 0x0020, xs);
  88                 write_reg(par, 0x0021, ys);
  89                 break;
  90         case 180:
  91                 write_reg(par, 0x0020, WIDTH - 1 - xs);
  92                 write_reg(par, 0x0021, HEIGHT - 1 - ys);
  93                 break;
  94         case 270:
  95                 write_reg(par, 0x0020, WIDTH - 1 - ys);
  96                 write_reg(par, 0x0021, xs);
  97                 break;
  98         case 90:
  99                 write_reg(par, 0x0020, ys);
 100                 write_reg(par, 0x0021, HEIGHT - 1 - xs);
 101                 break;
 102         }
 103         write_reg(par, 0x0022); /* Write Data to GRAM */
 104 }
 105
 106 static int set_var(struct fbtft_par *par)
 107 {
 108         switch (par->info->var.rotate) {
 109         /* AM: GRAM update direction */
 110         case 0:
 111                 write_reg(par, 0x03, 0x0003 | (par->bgr << 12));
 112                 break;
 113         case 180:
 114                 write_reg(par, 0x03, 0x0000 | (par->bgr << 12));
 115                 break;
 116         case 270:
 117                 write_reg(par, 0x03, 0x000A | (par->bgr << 12));
 118                 break;
 119         case 90:
 120                 write_reg(par, 0x03, 0x0009 | (par->bgr << 12));
 121                 break;
 122         }
 123
 124         return 0;
 125 }
 126
 127 /*
 128   Gamma string format:
 129     PKP0 PKP1 PKP2 PKP3 PKP4 PKP5 PKP6 PKP7 PKP8 PKP9 PKP10 PKP11 VRP0 VRP1
 130     PKN0 PKN1 PKN2 PKN3 PKN4 PKN5 PKN6 PKN7 PRN8 PRN9 PRN10 PRN11 VRN0 VRN1
 131 */
 132 #define CURVE(num, idx)  curves[num * par->gamma.num_values + idx]
 133 static int set_gamma(struct fbtft_par *par, unsigned long *curves)
 134 {
 135         unsigned long mask[] = {
 136                 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f,
 137                 0x3f, 0x3f, 0x1f, 0x1f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f,
 138                 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x1f, 0x1f,
 139         };
 140         int i, j;
 141
 142         /* apply mask */
 143         for (i = 0; i < 2; i++)
 144                 for (j = 0; j < 14; j++)
 145                         CURVE(i, j) &= mask[i * par->gamma.num_values + j];
 146
 147         write_reg(par, 0x0030, CURVE(0, 1) << 8 | CURVE(0, 0));
 148         write_reg(par, 0x0031, CURVE(0, 3) << 8 | CURVE(0, 2));
 149         write_reg(par, 0x0032, CURVE(0, 5) << 8 | CURVE(0, 3));
 150         write_reg(par, 0x0033, CURVE(0, 7) << 8 | CURVE(0, 6));
 151         write_reg(par, 0x0034, CURVE(0, 9) << 8 | CURVE(0, 8));
 152         write_reg(par, 0x0035, CURVE(0, 11) << 8 | CURVE(0, 10));
 153
 154         write_reg(par, 0x0036, CURVE(1, 1) << 8 | CURVE(1, 0));
 155         write_reg(par, 0x0037, CURVE(1, 3) << 8 | CURVE(1, 2));
 156         write_reg(par, 0x0038, CURVE(1, 5) << 8 | CURVE(1, 4));
 157         write_reg(par, 0x0039, CURVE(1, 7) << 8 | CURVE(1, 6));
 158         write_reg(par, 0x003A, CURVE(1, 9) << 8 | CURVE(1, 8));
 159         write_reg(par, 0x003B, CURVE(1, 11) << 8 | CURVE(1, 10));
 160
 161         write_reg(par, 0x003C, CURVE(0, 13) << 8 | CURVE(0, 12));
 162         write_reg(par, 0x003D, CURVE(1, 13) << 8 | CURVE(1, 12));
 163
 164         return 0;
 165 }
 166 #undef CURVE
 167
 168 static struct fbtft_display display = {
 169         .regwidth = 16,
 170         .width = WIDTH,
 171         .height = HEIGHT,
 172         .bpp = BPP,
 173         .fps = FPS,
 174         .gamma_num = 2,
 175         .gamma_len = 14,
 176         .gamma = DEFAULT_GAMMA,
 177         .fbtftops = {
 178                 .init_display = init_display,
 179                 .set_addr_win = set_addr_win,
 180                 .set_var = set_var,
 181                 .set_gamma = set_gamma,
 182         },
 183 };
 184
 185 FBTFT_REGISTER_DRIVER(DRVNAME, "samsung,s6d1121", &display);
 186
 187 MODULE_ALIAS("spi:" DRVNAME);
 188 MODULE_ALIAS("platform:" DRVNAME);
 189 MODULE_ALIAS("spi:s6d1121");
 190 MODULE_ALIAS("platform:s6d1121");
 191
 192 MODULE_DESCRIPTION("FB driver for the S6D1121 LCD Controller");
 193 MODULE_AUTHOR("Roman Rolinsky");
 194 MODULE_LICENSE("GPL");