LXR linux/drivers/staging/fbtft/fb

   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
  25static 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
 132static 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
 152static 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
 179static 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
 192FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8357d", &display);
 193
 194MODULE_ALIAS("spi:" DRVNAME);
 195MODULE_ALIAS("platform:" DRVNAME);
 196MODULE_ALIAS("spi:hx8357d");
 197MODULE_ALIAS("platform:hx8357d");
 198
 199MODULE_DESCRIPTION("FB driver for the HX8357D LCD Controller");
 200MODULE_AUTHOR("Sean Cross <xobs@kosagi.com>");
 201MODULE_LICENSE("GPL");
 202