drivers/staging/fbtft/fb_hx8357d.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * FB driver for the HX8357D LCD Controller
   4  * Copyright (C) 2015 Adafruit Industries
   5  *
   6  * Based on the HX8347D FB driver
   7  * Copyright (C) 2013 Christian Vogelgsang
   8  *
   9  * Based on driver code found here: https://github.com/watterott/r61505u-Adapter
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/delay.h>
  16 #include <video/mipi_display.h>
  17
  18 #include "fbtft.h"
  19 #include "fb_hx8357d.h"
  20
  21 #define DRVNAME         "fb_hx8357d"
  22 #define WIDTH           320
  23 #define HEIGHT          480
  24
  25 static int init_display(struct fbtft_par *par)
  26 {
  27         par->fbtftops.reset(par);
  28
  29         /* Reset things like Gamma */
  30         write_reg(par, MIPI_DCS_SOFT_RESET);
  31         usleep_range(5000, 7000);
  32
  33         /* setextc */
  34         write_reg(par, HX8357D_SETC, 0xFF, 0x83, 0x57);
  35         msleep(150);
  36
  37         /* setRGB which also enables SDO */
  38         write_reg(par, HX8357_SETRGB, 0x00, 0x00, 0x06, 0x06);
  39
  40         /* -1.52V */
  41         write_reg(par, HX8357D_SETCOM, 0x25);
  42
  43         /* Normal mode 70Hz, Idle mode 55 Hz */
  44         write_reg(par, HX8357_SETOSC, 0x68);
  45
  46         /* Set Panel - BGR, Gate direction swapped */
  47         write_reg(par, HX8357_SETPANEL, 0x05);
  48
  49         write_reg(par, HX8357_SETPWR1,
  50                   0x00,  /* Not deep standby */
  51                   0x15,  /* BT */
  52                   0x1C,  /* VSPR */
  53                   0x1C,  /* VSNR */
  54                   0x83,  /* AP */
  55                   0xAA);  /* FS */
  56
  57         write_reg(par, HX8357D_SETSTBA,
  58                   0x50,  /* OPON normal */
  59                   0x50,  /* OPON idle */
  60                   0x01,  /* STBA */
  61                   0x3C,  /* STBA */
  62                   0x1E,  /* STBA */
  63                   0x08);  /* GEN */
  64
  65         write_reg(par, HX8357D_SETCYC,
  66                   0x02,  /* NW 0x02 */
  67                   0x40,  /* RTN */
  68                   0x00,  /* DIV */
  69                   0x2A,  /* DUM */
  70                   0x2A,  /* DUM */
  71                   0x0D,  /* GDON */
  72                   0x78);  /* GDOFF */
  73
  74         write_reg(par, HX8357D_SETGAMMA,
  75                   0x02,
  76                   0x0A,
  77                   0x11,
  78                   0x1d,
  79                   0x23,
  80                   0x35,
  81                   0x41,
  82                   0x4b,
  83                   0x4b,
  84                   0x42,
  85                   0x3A,
  86                   0x27,
  87                   0x1B,
  88                   0x08,
  89                   0x09,
  90                   0x03,
  91                   0x02,
  92                   0x0A,
  93                   0x11,
  94                   0x1d,
  95                   0x23,
  96                   0x35,
  97                   0x41,
  98                   0x4b,
  99                   0x4b,
 100                   0x42,
 101                   0x3A,
 102                   0x27,
 103                   0x1B,
 104                   0x08,
 105                   0x09,
 106                   0x03,
 107                   0x00,
 108                   0x01);
 109
 110         /* 16 bit */
 111         write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
 112
 113         write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0xC0);
 114
 115         /* TE off */
 116         write_reg(par, MIPI_DCS_SET_TEAR_ON, 0x00);
 117
 118         /* tear line */
 119         write_reg(par, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02);
 120
 121         /* Exit Sleep */
 122         write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
 123         msleep(150);
 124
 125         /* display on */
 126         write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
 127         usleep_range(5000, 7000);
 128
 129         return 0;
 130 }
 131
 132 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
 133 {
 134         write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
 135                   xs >> 8, xs & 0xff,  /* XSTART */
 136                   xe >> 8, xe & 0xff); /* XEND */
 137
 138         write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
 139                   ys >> 8, ys & 0xff,  /* YSTART */
 140                   ye >> 8, ye & 0xff); /* YEND */
 141
 142         write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
 143 }
 144
 145 #define HX8357D_MADCTL_MY  0x80
 146 #define HX8357D_MADCTL_MX  0x40
 147 #define HX8357D_MADCTL_MV  0x20
 148 #define HX8357D_MADCTL_ML  0x10
 149 #define HX8357D_MADCTL_RGB 0x00
 150 #define HX8357D_MADCTL_BGR 0x08
 151 #define HX8357D_MADCTL_MH  0x04
 152 static int set_var(struct fbtft_par *par)
 153 {
 154         u8 val;
 155
 156         switch (par->info->var.rotate) {
 157         case 270:
 158                 val = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX;
 159                 break;
 160         case 180:
 161                 val = 0;
 162                 break;
 163         case 90:
 164                 val = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY;
 165                 break;
 166         default:
 167                 val = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY;
 168                 break;
 169         }
 170
 171         val |= (par->bgr ? HX8357D_MADCTL_RGB : HX8357D_MADCTL_BGR);
 172
 173         /* Memory Access Control */
 174         write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, val);
 175
 176         return 0;
 177 }
 178
 179 static struct fbtft_display display = {
 180         .regwidth = 8,
 181         .width = WIDTH,
 182         .height = HEIGHT,
 183         .gamma_num = 2,
 184         .gamma_len = 14,
 185         .fbtftops = {
 186                 .init_display = init_display,
 187                 .set_addr_win = set_addr_win,
 188                 .set_var = set_var,
 189         },
 190 };
 191
 192 FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8357d", &display);
 193
 194 MODULE_ALIAS("spi:" DRVNAME);
 195 MODULE_ALIAS("platform:" DRVNAME);
 196 MODULE_ALIAS("spi:hx8357d");
 197 MODULE_ALIAS("platform:hx8357d");
 198
 199 MODULE_DESCRIPTION("FB driver for the HX8357D LCD Controller");
 200 MODULE_AUTHOR("Sean Cross <xobs@kosagi.com>");
 201 MODULE_LICENSE("GPL");