drivers/staging/fbtft/fb_s6d1121.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * FB driver for the S6D1121 LCD Controller
   4  *
   5  * Copyright (C) 2013 Roman Rolinsky
   6  *
   7  * Based on fb_ili9325.c by Noralf Tronnes
   8  * Based on ili9325.c by Jeroen Domburg
   9  * Init code from UTFT library by Henning Karlsen
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/gpio/consumer.h>
  16 #include <linux/delay.h>
  17
  18 #include "fbtft.h"
  19
  20 #define DRVNAME         "fb_s6d1121"
  21 #define WIDTH           240
  22 #define HEIGHT          320
  23 #define BPP             16
  24 #define FPS             20
  25 #define DEFAULT_GAMMA   "26 09 24 2C 1F 23 24 25 22 26 25 23 0D 00\n" \
  26                         "1C 1A 13 1D 0B 11 12 10 13 15 36 19 00 0D"
  27
  28 static int init_display(struct fbtft_par *par)
  29 {
  30         par->fbtftops.reset(par);
  31
  32         if (!par->gpio.cs)
  33                 gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
  34
  35         /* Initialization sequence from Lib_UTFT */
  36
  37         write_reg(par, 0x0011, 0x2004);
  38         write_reg(par, 0x0013, 0xCC00);
  39         write_reg(par, 0x0015, 0x2600);
  40         write_reg(par, 0x0014, 0x252A);
  41         write_reg(par, 0x0012, 0x0033);
  42         write_reg(par, 0x0013, 0xCC04);
  43         write_reg(par, 0x0013, 0xCC06);
  44         write_reg(par, 0x0013, 0xCC4F);
  45         write_reg(par, 0x0013, 0x674F);
  46         write_reg(par, 0x0011, 0x2003);
  47         write_reg(par, 0x0016, 0x0007);
  48         write_reg(par, 0x0002, 0x0013);
  49         write_reg(par, 0x0003, 0x0003);
  50         write_reg(par, 0x0001, 0x0127);
  51         write_reg(par, 0x0008, 0x0303);
  52         write_reg(par, 0x000A, 0x000B);
  53         write_reg(par, 0x000B, 0x0003);
  54         write_reg(par, 0x000C, 0x0000);
  55         write_reg(par, 0x0041, 0x0000);
  56         write_reg(par, 0x0050, 0x0000);
  57         write_reg(par, 0x0060, 0x0005);
  58         write_reg(par, 0x0070, 0x000B);
  59         write_reg(par, 0x0071, 0x0000);
  60         write_reg(par, 0x0078, 0x0000);
  61         write_reg(par, 0x007A, 0x0000);
  62         write_reg(par, 0x0079, 0x0007);
  63         write_reg(par, 0x0007, 0x0051);
  64         write_reg(par, 0x0007, 0x0053);
  65         write_reg(par, 0x0079, 0x0000);
  66
  67         write_reg(par, 0x0022); /* Write Data to GRAM */
  68
  69         return 0;
  70 }
  71
  72 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
  73 {
  74         switch (par->info->var.rotate) {
  75         /* R20h = Horizontal GRAM Start Address */
  76         /* R21h = Vertical GRAM Start Address */
  77         case 0:
  78                 write_reg(par, 0x0020, xs);
  79                 write_reg(par, 0x0021, ys);
  80                 break;
  81         case 180:
  82                 write_reg(par, 0x0020, WIDTH - 1 - xs);
  83                 write_reg(par, 0x0021, HEIGHT - 1 - ys);
  84                 break;
  85         case 270:
  86                 write_reg(par, 0x0020, WIDTH - 1 - ys);
  87                 write_reg(par, 0x0021, xs);
  88                 break;
  89         case 90:
  90                 write_reg(par, 0x0020, ys);
  91                 write_reg(par, 0x0021, HEIGHT - 1 - xs);
  92                 break;
  93         }
  94         write_reg(par, 0x0022); /* Write Data to GRAM */
  95 }
  96
  97 static int set_var(struct fbtft_par *par)
  98 {
  99         switch (par->info->var.rotate) {
 100         /* AM: GRAM update direction */
 101         case 0:
 102                 write_reg(par, 0x03, 0x0003 | (par->bgr << 12));
 103                 break;
 104         case 180:
 105                 write_reg(par, 0x03, 0x0000 | (par->bgr << 12));
 106                 break;
 107         case 270:
 108                 write_reg(par, 0x03, 0x000A | (par->bgr << 12));
 109                 break;
 110         case 90:
 111                 write_reg(par, 0x03, 0x0009 | (par->bgr << 12));
 112                 break;
 113         }
 114
 115         return 0;
 116 }
 117
 118 /*
 119  * Gamma string format:
 120  * PKP0 PKP1 PKP2 PKP3 PKP4 PKP5 PKP6 PKP7 PKP8 PKP9 PKP10 PKP11 VRP0 VRP1
 121  * PKN0 PKN1 PKN2 PKN3 PKN4 PKN5 PKN6 PKN7 PRN8 PRN9 PRN10 PRN11 VRN0 VRN1
 122  */
 123 #define CURVE(num, idx)  curves[(num) * par->gamma.num_values + (idx)]
 124 static int set_gamma(struct fbtft_par *par, u32 *curves)
 125 {
 126         unsigned long mask[] = {
 127                 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f,
 128                 0x3f, 0x3f, 0x1f, 0x1f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f,
 129                 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x1f, 0x1f,
 130         };
 131         int i, j;
 132
 133         /* apply mask */
 134         for (i = 0; i < 2; i++)
 135                 for (j = 0; j < 14; j++)
 136                         CURVE(i, j) &= mask[i * par->gamma.num_values + j];
 137
 138         write_reg(par, 0x0030, CURVE(0, 1) << 8 | CURVE(0, 0));
 139         write_reg(par, 0x0031, CURVE(0, 3) << 8 | CURVE(0, 2));
 140         write_reg(par, 0x0032, CURVE(0, 5) << 8 | CURVE(0, 3));
 141         write_reg(par, 0x0033, CURVE(0, 7) << 8 | CURVE(0, 6));
 142         write_reg(par, 0x0034, CURVE(0, 9) << 8 | CURVE(0, 8));
 143         write_reg(par, 0x0035, CURVE(0, 11) << 8 | CURVE(0, 10));
 144
 145         write_reg(par, 0x0036, CURVE(1, 1) << 8 | CURVE(1, 0));
 146         write_reg(par, 0x0037, CURVE(1, 3) << 8 | CURVE(1, 2));
 147         write_reg(par, 0x0038, CURVE(1, 5) << 8 | CURVE(1, 4));
 148         write_reg(par, 0x0039, CURVE(1, 7) << 8 | CURVE(1, 6));
 149         write_reg(par, 0x003A, CURVE(1, 9) << 8 | CURVE(1, 8));
 150         write_reg(par, 0x003B, CURVE(1, 11) << 8 | CURVE(1, 10));
 151
 152         write_reg(par, 0x003C, CURVE(0, 13) << 8 | CURVE(0, 12));
 153         write_reg(par, 0x003D, CURVE(1, 13) << 8 | CURVE(1, 12));
 154
 155         return 0;
 156 }
 157
 158 #undef CURVE
 159
 160 static struct fbtft_display display = {
 161         .regwidth = 16,
 162         .width = WIDTH,
 163         .height = HEIGHT,
 164         .bpp = BPP,
 165         .fps = FPS,
 166         .gamma_num = 2,
 167         .gamma_len = 14,
 168         .gamma = DEFAULT_GAMMA,
 169         .fbtftops = {
 170                 .init_display = init_display,
 171                 .set_addr_win = set_addr_win,
 172                 .set_var = set_var,
 173                 .set_gamma = set_gamma,
 174         },
 175 };
 176
 177 FBTFT_REGISTER_DRIVER(DRVNAME, "samsung,s6d1121", &display);
 178
 179 MODULE_ALIAS("spi:" DRVNAME);
 180 MODULE_ALIAS("platform:" DRVNAME);
 181 MODULE_ALIAS("spi:s6d1121");
 182 MODULE_ALIAS("platform:s6d1121");
 183
 184 MODULE_DESCRIPTION("FB driver for the S6D1121 LCD Controller");
 185 MODULE_AUTHOR("Roman Rolinsky");
 186 MODULE_LICENSE("GPL");