drivers/staging/fbtft/flexfb.c

   1 /*
   2  * Generic FB driver for TFT LCD displays
   3  *
   4  * Copyright (C) 2013 Noralf Tronnes
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/gpio.h>
  26 #include <linux/spi/spi.h>
  27 #include <linux/delay.h>
  28
  29 #include "fbtft.h"
  30
  31 #define DRVNAME     "flexfb"
  32
  33
  34 static char *chip;
  35 module_param(chip, charp, 0);
  36 MODULE_PARM_DESC(chip, "LCD controller");
  37
  38 static unsigned int width;
  39 module_param(width, uint, 0);
  40 MODULE_PARM_DESC(width, "Display width");
  41
  42 static unsigned int height;
  43 module_param(height, uint, 0);
  44 MODULE_PARM_DESC(height, "Display height");
  45
  46 static int init[512];
  47 static int init_num;
  48 module_param_array(init, int, &init_num, 0);
  49 MODULE_PARM_DESC(init, "Init sequence");
  50
  51 static unsigned int setaddrwin;
  52 module_param(setaddrwin, uint, 0);
  53 MODULE_PARM_DESC(setaddrwin, "Which set_addr_win() implementation to use");
  54
  55 static unsigned int buswidth = 8;
  56 module_param(buswidth, uint, 0);
  57 MODULE_PARM_DESC(buswidth, "Width of databus (default: 8)");
  58
  59 static unsigned int regwidth = 8;
  60 module_param(regwidth, uint, 0);
  61 MODULE_PARM_DESC(regwidth, "Width of controller register (default: 8)");
  62
  63 static bool nobacklight;
  64 module_param(nobacklight, bool, 0);
  65 MODULE_PARM_DESC(nobacklight, "Turn off backlight functionality.");
  66
  67 static bool latched;
  68 module_param(latched, bool, 0);
  69 MODULE_PARM_DESC(latched, "Use with latched 16-bit databus");
  70
  71
  72 static int *initp;
  73 static int initp_num;
  74
  75 /* default init sequences */
  76 static int st7735r_init[] = { \
  77 -1,0x01,-2,150,-1,0x11,-2,500,-1,0xB1,0x01,0x2C,0x2D,-1,0xB2,0x01,0x2C,0x2D,-1,0xB3,0x01,0x2C,0x2D,0x01,0x2C,0x2D, \
  78 -1,0xB4,0x07,-1,0xC0,0xA2,0x02,0x84,-1,0xC1,0xC5,-1,0xC2,0x0A,0x00,-1,0xC3,0x8A,0x2A,-1,0xC4,0x8A,0xEE,-1,0xC5,0x0E, \
  79 -1,0x20,-1,0x36,0xC0,-1,0x3A,0x05,-1,0xE0,0x0f,0x1a,0x0f,0x18,0x2f,0x28,0x20,0x22,0x1f,0x1b,0x23,0x37,0x00,0x07,0x02,0x10, \
  80 -1,0xE1,0x0f,0x1b,0x0f,0x17,0x33,0x2c,0x29,0x2e,0x30,0x30,0x39,0x3f,0x00,0x07,0x03,0x10,-1,0x29,-2,100,-1,0x13,-2,10,-3 };
  81
  82 static int ssd1289_init[] = { \
  83 -1,0x00,0x0001,-1,0x03,0xA8A4,-1,0x0C,0x0000,-1,0x0D,0x080C,-1,0x0E,0x2B00,-1,0x1E,0x00B7,-1,0x01,0x2B3F,-1,0x02,0x0600, \
  84 -1,0x10,0x0000,-1,0x11,0x6070,-1,0x05,0x0000,-1,0x06,0x0000,-1,0x16,0xEF1C,-1,0x17,0x0003,-1,0x07,0x0233,-1,0x0B,0x0000, \
  85 -1,0x0F,0x0000,-1,0x41,0x0000,-1,0x42,0x0000,-1,0x48,0x0000,-1,0x49,0x013F,-1,0x4A,0x0000,-1,0x4B,0x0000,-1,0x44,0xEF00, \
  86 -1,0x45,0x0000,-1,0x46,0x013F,-1,0x30,0x0707,-1,0x31,0x0204,-1,0x32,0x0204,-1,0x33,0x0502,-1,0x34,0x0507,-1,0x35,0x0204, \
  87 -1,0x36,0x0204,-1,0x37,0x0502,-1,0x3A,0x0302,-1,0x3B,0x0302,-1,0x23,0x0000,-1,0x24,0x0000,-1,0x25,0x8000,-1,0x4f,0x0000, \
  88 -1,0x4e,0x0000,-1,0x22,-3 };
  89
  90 static int hx8340bn_init[] = { \
  91 -1,0xC1,0xFF,0x83,0x40,-1,0x11,-2,150,-1,0xCA,0x70,0x00,0xD9,-1,0xB0,0x01,0x11, \
  92 -1,0xC9,0x90,0x49,0x10,0x28,0x28,0x10,0x00,0x06,-2,20,-1,0xC2,0x60,0x71,0x01,0x0E,0x05,0x02,0x09,0x31,0x0A, \
  93 -1,0xC3,0x67,0x30,0x61,0x17,0x48,0x07,0x05,0x33,-2,10,-1,0xB5,0x35,0x20,0x45,-1,0xB4,0x33,0x25,0x4C,-2,10, \
  94 -1,0x3A,0x05,-1,0x29,-2,10,-3 };
  95
  96 static int ili9225_init[] = { \
  97 -1,0x0001,0x011C,-1,0x0002,0x0100,-1,0x0003,0x1030,-1,0x0008,0x0808,-1,0x000C,0x0000,-1,0x000F,0x0A01,-1,0x0020,0x0000, \
  98 -1,0x0021,0x0000,-2,50,-1,0x0010,0x0A00,-1,0x0011,0x1038,-2,50,-1,0x0012,0x1121,-1,0x0013,0x004E,-1,0x0014,0x676F, \
  99 -1,0x0030,0x0000,-1,0x0031,0x00DB,-1,0x0032,0x0000,-1,0x0033,0x0000,-1,0x0034,0x00DB,-1,0x0035,0x0000,-1,0x0036,0x00AF, \
 100 -1,0x0037,0x0000,-1,0x0038,0x00DB,-1,0x0039,0x0000,-1,0x0050,0x0000,-1,0x0051,0x060A,-1,0x0052,0x0D0A,-1,0x0053,0x0303, \
 101 -1,0x0054,0x0A0D,-1,0x0055,0x0A06,-1,0x0056,0x0000,-1,0x0057,0x0303,-1,0x0058,0x0000,-1,0x0059,0x0000,-2,50, \
 102 -1,0x0007,0x1017,-2,50,-3 };
 103
 104 static int ili9320_init[] = { \
 105 -1,0x00E5,0x8000,-1,0x0000,0x0001,-1,0x0001,0x0100,-1,0x0002,0x0700,-1,0x0003,0x1030,-1,0x0004,0x0000,-1,0x0008,0x0202, \
 106 -1,0x0009,0x0000,-1,0x000A,0x0000,-1,0x000C,0x0000,-1,0x000D,0x0000,-1,0x000F,0x0000,-1,0x0010,0x0000,-1,0x0011,0x0007, \
 107 -1,0x0012,0x0000,-1,0x0013,0x0000,-2,200,-1,0x0010,0x17B0,-1,0x0011,0x0031,-2,50,-1,0x0012,0x0138,-2,50,-1,0x0013,0x1800, \
 108 -1,0x0029,0x0008,-2,50,-1,0x0020,0x0000,-1,0x0021,0x0000,-1,0x0030,0x0000,-1,0x0031,0x0505,-1,0x0032,0x0004, \
 109 -1,0x0035,0x0006,-1,0x0036,0x0707,-1,0x0037,0x0105,-1,0x0038,0x0002,-1,0x0039,0x0707,-1,0x003C,0x0704,-1,0x003D,0x0807, \
 110 -1,0x0050,0x0000,-1,0x0051,0x00EF,-1,0x0052,0x0000,-1,0x0053,0x013F,-1,0x0060,0x2700,-1,0x0061,0x0001,-1,0x006A,0x0000, \
 111 -1,0x0080,0x0000,-1,0x0081,0x0000,-1,0x0082,0x0000,-1,0x0083,0x0000,-1,0x0084,0x0000,-1,0x0085,0x0000,-1,0x0090,0x0010, \
 112 -1,0x0092,0x0000,-1,0x0093,0x0003,-1,0x0095,0x0110,-1,0x0097,0x0000,-1,0x0098,0x0000,-1,0x0007,0x0173,-3 };
 113
 114 static int ili9325_init[] = { \
 115 -1,0x00E3,0x3008,-1,0x00E7,0x0012,-1,0x00EF,0x1231,-1,0x0001,0x0100,-1,0x0002,0x0700,-1,0x0003,0x1030,-1,0x0004,0x0000, \
 116 -1,0x0008,0x0207,-1,0x0009,0x0000,-1,0x000A,0x0000,-1,0x000C,0x0000,-1,0x000D,0x0000,-1,0x000F,0x0000,-1,0x0010,0x0000, \
 117 -1,0x0011,0x0007,-1,0x0012,0x0000,-1,0x0013,0x0000,-2,200,-1,0x0010,0x1690,-1,0x0011,0x0223,-2,50,-1,0x0012,0x000D,-2,50, \
 118 -1,0x0013,0x1200,-1,0x0029,0x000A,-1,0x002B,0x000C,-2,50,-1,0x0020,0x0000,-1,0x0021,0x0000,-1,0x0030,0x0000, \
 119 -1,0x0031,0x0506,-1,0x0032,0x0104,-1,0x0035,0x0207,-1,0x0036,0x000F,-1,0x0037,0x0306,-1,0x0038,0x0102,-1,0x0039,0x0707, \
 120 -1,0x003C,0x0702,-1,0x003D,0x1604,-1,0x0050,0x0000,-1,0x0051,0x00EF,-1,0x0052,0x0000,-1,0x0053,0x013F,-1,0x0060,0xA700, \
 121 -1,0x0061,0x0001,-1,0x006A,0x0000,-1,0x0080,0x0000,-1,0x0081,0x0000,-1,0x0082,0x0000,-1,0x0083,0x0000,-1,0x0084,0x0000, \
 122 -1,0x0085,0x0000,-1,0x0090,0x0010,-1,0x0092,0x0600,-1,0x0007,0x0133,-3 };
 123
 124 static int ili9341_init[] = { \
 125 -1,0x28,-2,20,-1,0xCF,0x00,0x83,0x30,-1,0xED,0x64,0x03,0x12,0x81,-1,0xE8,0x85,0x01,0x79, \
 126 -1,0xCB,0x39,0x2c,0x00,0x34,0x02,-1,0xF7,0x20,-1,0xEA,0x00,0x00,-1,0xC0,0x26,-1,0xC1,0x11, \
 127 -1,0xC5,0x35,0x3E,-1,0xC7,0xBE,-1,0xB1,0x00,0x1B,-1,0xB6,0x0a,0x82,0x27,0x00,-1,0xB7,0x07, \
 128 -1,0x3A,0x55,-1,0x36,0x48,-1,0x11,-2,120,-1,0x29,-2,20,-3 };
 129
 130 static int ssd1351_init[] = { -1,0xfd,0x12,-1,0xfd,0xb1,-1,0xae,-1,0xb3,0xf1,-1,0xca,0x7f,-1,0xa0,0x74, \
 131                               -1,0x15,0x00,0x7f,-1,0x75,0x00,0x7f,-1,0xa1,0x00,-1,0xa2,0x00,-1,0xb5,0x00, \
 132                               -1,0xab,0x01,-1,0xb1,0x32,-1,0xb4,0xa0,0xb5,0x55,-1,0xbb,0x17,-1,0xbe,0x05, \
 133                               -1,0xc1,0xc8,0x80,0xc8,-1,0xc7,0x0f,-1,0xb6,0x01,-1,0xa6,-1,0xaf,-3 };
 134
 135
 136 /* ili9320, ili9325 */
 137 static void flexfb_set_addr_win_1(struct fbtft_par *par, int xs, int ys, int xe, int ye)
 138 {
 139         fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par, "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
 140         switch (par->info->var.rotate) {
 141         /* R20h = Horizontal GRAM Start Address */
 142         /* R21h = Vertical GRAM Start Address */
 143         case 0:
 144                 write_reg(par, 0x0020, xs);
 145                 write_reg(par, 0x0021, ys);
 146                 break;
 147         case 180:
 148                 write_reg(par, 0x0020, width - 1 - xs);
 149                 write_reg(par, 0x0021, height - 1 - ys);
 150                 break;
 151         case 270:
 152                 write_reg(par, 0x0020, width - 1 - ys);
 153                 write_reg(par, 0x0021, xs);
 154                 break;
 155         case 90:
 156                 write_reg(par, 0x0020, ys);
 157                 write_reg(par, 0x0021, height - 1 - xs);
 158                 break;
 159         }
 160         write_reg(par, 0x0022); /* Write Data to GRAM */
 161 }
 162
 163 /* ssd1289 */
 164 static void flexfb_set_addr_win_2(struct fbtft_par *par, int xs, int ys, int xe, int ye)
 165 {
 166         fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par, "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
 167
 168         switch (par->info->var.rotate) {
 169         /* R4Eh - Set GDDRAM X address counter */
 170         /* R4Fh - Set GDDRAM Y address counter */
 171         case 0:
 172                 write_reg(par, 0x4e, xs);
 173                 write_reg(par, 0x4f, ys);
 174                 break;
 175         case 180:
 176                 write_reg(par, 0x4e, par->info->var.xres - 1 - xs);
 177                 write_reg(par, 0x4f, par->info->var.yres - 1 - ys);
 178                 break;
 179         case 270:
 180                 write_reg(par, 0x4e, par->info->var.yres - 1 - ys);
 181                 write_reg(par, 0x4f, xs);
 182                 break;
 183         case 90:
 184                 write_reg(par, 0x4e, ys);
 185                 write_reg(par, 0x4f, par->info->var.xres - 1 - xs);
 186                 break;
 187         }
 188
 189         /* R22h - RAM data write */
 190         write_reg(par, 0x22, 0);
 191 }
 192
 193 /* ssd1351 */
 194 static void set_addr_win_3(struct fbtft_par *par, int xs, int ys, int xe, int ye)
 195 {
 196         fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par, "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
 197
 198         write_reg(par, 0x15, xs, xe);
 199         write_reg(par, 0x75, ys, ye);
 200         write_reg(par, 0x5C);
 201 }
 202
 203 static int flexfb_verify_gpios_dc(struct fbtft_par *par)
 204 {
 205         fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);
 206
 207         if (par->gpio.dc < 0) {
 208                 dev_err(par->info->device, "Missing info about 'dc' gpio. Aborting.\n");
 209                 return -EINVAL;
 210         }
 211
 212         return 0;
 213 }
 214
 215 static int flexfb_verify_gpios_db(struct fbtft_par *par)
 216 {
 217         int i;
 218         int num_db = buswidth;
 219
 220         fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);
 221
 222         if (par->gpio.dc < 0) {
 223                 dev_err(par->info->device, "Missing info about 'dc' gpio. Aborting.\n");
 224                 return -EINVAL;
 225         }
 226         if (par->gpio.wr < 0) {
 227                 dev_err(par->info->device, "Missing info about 'wr' gpio. Aborting.\n");
 228                 return -EINVAL;
 229         }
 230         if (latched && (par->gpio.latch < 0)) {
 231                 dev_err(par->info->device, "Missing info about 'latch' gpio. Aborting.\n");
 232                 return -EINVAL;
 233         }
 234         if (latched)
 235                 num_db=buswidth/2;
 236         for (i=0;i < num_db;i++) {
 237                 if (par->gpio.db[i] < 0) {
 238                         dev_err(par->info->device, "Missing info about 'db%02d' gpio. Aborting.\n", i);
 239                         return -EINVAL;
 240                 }
 241         }
 242
 243         return 0;
 244 }
 245
 246 static struct fbtft_display flex_display = { };
 247
 248 static int flexfb_probe_common(struct spi_device *sdev, struct platform_device *pdev)
 249 {
 250         struct device *dev;
 251         struct fb_info *info;
 252         struct fbtft_par *par;
 253         int ret;
 254
 255         initp = init;
 256         initp_num = init_num;
 257
 258         if (sdev)
 259                 dev = &sdev->dev;
 260         else
 261                 dev = &pdev->dev;
 262
 263         fbtft_init_dbg(dev, "%s(%s)\n", __func__, sdev ? "'SPI device'" : "'Platform device'");
 264
 265         if (chip) {
 266
 267                 if (!strcmp(chip, "st7735r")) {
 268                         if (!width)
 269                                 width = 128;
 270                         if (!height)
 271                                 height = 160;
 272                         if (init_num == 0) {
 273                                 initp = st7735r_init;
 274                                 initp_num = ARRAY_SIZE(st7735r_init);
 275                         }
 276
 277
 278                 } else if (!strcmp(chip, "hx8340bn")) {
 279                         if (!width)
 280                                 width = 176;
 281                         if (!height)
 282                                 height = 220;
 283                         setaddrwin = 0;
 284                         if (init_num == 0) {
 285                                 initp = hx8340bn_init;
 286                                 initp_num = ARRAY_SIZE(hx8340bn_init);
 287                         }
 288
 289
 290                 } else if (!strcmp(chip, "ili9225")) {
 291                         if (!width)
 292                                 width = 176;
 293                         if (!height)
 294                                 height = 220;
 295                         setaddrwin = 0;
 296                         regwidth = 16;
 297                         if (init_num == 0) {
 298                                 initp = ili9225_init;
 299                                 initp_num = ARRAY_SIZE(ili9225_init);
 300                         }
 301
 302
 303
 304                 } else if (!strcmp(chip, "ili9320")) {
 305                         if (!width)
 306                                 width = 240;
 307                         if (!height)
 308                                 height = 320;
 309                         setaddrwin = 1;
 310                         regwidth = 16;
 311                         if (init_num == 0) {
 312                                 initp = ili9320_init;
 313                                 initp_num = ARRAY_SIZE(ili9320_init);
 314                         }
 315
 316
 317                 } else if (!strcmp(chip, "ili9325")) {
 318                         if (!width)
 319                                 width = 240;
 320                         if (!height)
 321                                 height = 320;
 322                         setaddrwin = 1;
 323                         regwidth = 16;
 324                         if (init_num == 0) {
 325                                 initp = ili9325_init;
 326                                 initp_num = ARRAY_SIZE(ili9325_init);
 327                         }
 328
 329                 } else if (!strcmp(chip, "ili9341")) {
 330                         if (!width)
 331                                 width = 240;
 332                         if (!height)
 333                                 height = 320;
 334                         setaddrwin = 0;
 335                         regwidth = 8;
 336                         if (init_num == 0) {
 337                                 initp = ili9341_init;
 338                                 initp_num = ARRAY_SIZE(ili9341_init);
 339                         }
 340
 341
 342                 } else if (!strcmp(chip, "ssd1289")) {
 343                         if (!width)
 344                                 width = 240;
 345                         if (!height)
 346                                 height = 320;
 347                         setaddrwin = 2;
 348                         regwidth = 16;
 349                         if (init_num == 0) {
 350                                 initp = ssd1289_init;
 351                                 initp_num = ARRAY_SIZE(ssd1289_init);
 352                         }
 353
 354
 355
 356                 } else if (!strcmp(chip, "ssd1351")) {
 357                         if (!width)
 358                                 width = 128;
 359                         if (!height)
 360                                 height = 128;
 361                         setaddrwin = 3;
 362                         if (init_num == 0) {
 363                                 initp = ssd1351_init;
 364                                 initp_num = ARRAY_SIZE(ssd1351_init);
 365                         }
 366                 } else {
 367                         dev_err(dev, "chip=%s is not supported\n", chip);
 368                         return -EINVAL;
 369                 }
 370         }
 371
 372         if (width == 0 || height == 0) {
 373                 dev_err(dev, "argument(s) missing: width and height has to be set.\n");
 374                 return -EINVAL;
 375         }
 376         flex_display.width = width;
 377         flex_display.height = height;
 378         fbtft_init_dbg(dev, "Display resolution: %dx%d\n", width, height);
 379         fbtft_init_dbg(dev, "chip = %s\n", chip ? chip : "not set");
 380         fbtft_init_dbg(dev, "setaddrwin = %d\n", setaddrwin);
 381         fbtft_init_dbg(dev, "regwidth = %d\n", regwidth);
 382         fbtft_init_dbg(dev, "buswidth = %d\n", buswidth);
 383
 384         info = fbtft_framebuffer_alloc(&flex_display, dev);
 385         if (!info)
 386                 return -ENOMEM;
 387
 388         par = info->par;
 389         if (sdev)
 390                 par->spi = sdev;
 391         else
 392                 par->pdev = pdev;
 393         if (!par->init_sequence)
 394                 par->init_sequence = initp;
 395         par->fbtftops.init_display = fbtft_init_display;
 396
 397         /* registerwrite functions */
 398         switch (regwidth) {
 399         case 8:
 400                 par->fbtftops.write_register = fbtft_write_reg8_bus8;
 401                 break;
 402         case 16:
 403                 par->fbtftops.write_register = fbtft_write_reg16_bus8;
 404                 break;
 405         default:
 406                 dev_err(dev, "argument 'regwidth': %d is not supported.\n", regwidth);
 407                 return -EINVAL;
 408         }
 409
 410         /* bus functions */
 411         if (sdev) {
 412                 par->fbtftops.write = fbtft_write_spi;
 413                 switch (buswidth) {
 414                 case 8:
 415                         par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
 416                         if (!par->startbyte)
 417                                 par->fbtftops.verify_gpios = flexfb_verify_gpios_dc;
 418                         break;
 419                 case 9:
 420                         if (regwidth == 16) {
 421                                 dev_err(dev, "argument 'regwidth': %d is not supported with buswidth=%d and SPI.\n", regwidth, buswidth);
 422                                 return -EINVAL;
 423                         }
 424                         par->fbtftops.write_register = fbtft_write_reg8_bus9;
 425                         par->fbtftops.write_vmem = fbtft_write_vmem16_bus9;
 426                         sdev->bits_per_word=9;
 427                         ret = sdev->master->setup(sdev);
 428                         if (ret) {
 429                                 dev_warn(dev,
 430                                         "9-bit SPI not available, emulating using 8-bit.\n");
 431                                 sdev->bits_per_word = 8;
 432                                 ret = sdev->master->setup(sdev);
 433                                 if (ret)
 434                                         goto out_release;
 435                                 /* allocate buffer with room for dc bits */
 436                                 par->extra = devm_kzalloc(par->info->device,
 437                                                 par->txbuf.len + (par->txbuf.len / 8) + 8,
 438                                                 GFP_KERNEL);
 439                                 if (!par->extra) {
 440                                         ret = -ENOMEM;
 441                                         goto out_release;
 442                                 }
 443                                 par->fbtftops.write = fbtft_write_spi_emulate_9;
 444                         }
 445                         break;
 446                 default:
 447                         dev_err(dev, "argument 'buswidth': %d is not supported with SPI.\n", buswidth);
 448                         return -EINVAL;
 449                 }
 450         } else {
 451                 par->fbtftops.verify_gpios = flexfb_verify_gpios_db;
 452                 switch (buswidth) {
 453                 case 8:
 454                         par->fbtftops.write = fbtft_write_gpio8_wr;
 455                         par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
 456                         break;
 457                 case 16:
 458                         par->fbtftops.write_register = fbtft_write_reg16_bus16;
 459                         if (latched)
 460                                 par->fbtftops.write = fbtft_write_gpio16_wr_latched;
 461                         else
 462                                 par->fbtftops.write = fbtft_write_gpio16_wr;
 463                         par->fbtftops.write_vmem = fbtft_write_vmem16_bus16;
 464                         break;
 465                 default:
 466                         dev_err(dev, "argument 'buswidth': %d is not supported with parallel.\n", buswidth);
 467                         return -EINVAL;
 468                 }
 469         }
 470
 471         /* set_addr_win function */
 472         switch (setaddrwin) {
 473         case 0:
 474                 /* use default */
 475                 break;
 476         case 1:
 477                 par->fbtftops.set_addr_win = flexfb_set_addr_win_1;
 478                 break;
 479         case 2:
 480                 par->fbtftops.set_addr_win = flexfb_set_addr_win_2;
 481                 break;
 482         case 3:
 483                 par->fbtftops.set_addr_win = set_addr_win_3;
 484                 break;
 485         default:
 486                 dev_err(dev, "argument 'setaddrwin': unknown value %d.\n", setaddrwin);
 487                 return -EINVAL;
 488         }
 489
 490         if (!nobacklight)
 491                 par->fbtftops.register_backlight = fbtft_register_backlight;
 492
 493         ret = fbtft_register_framebuffer(info);
 494         if (ret < 0)
 495                 goto out_release;
 496
 497         return 0;
 498
 499 out_release:
 500         fbtft_framebuffer_release(info);
 501
 502         return ret;
 503 }
 504
 505 static int flexfb_remove_common(struct device *dev, struct fb_info *info)
 506 {
 507         struct fbtft_par *par;
 508
 509         if (!info)
 510                 return -EINVAL;
 511         par = info->par;
 512         if (par)
 513                 fbtft_par_dbg(DEBUG_DRIVER_INIT_FUNCTIONS, par,
 514                         "%s()\n", __func__);
 515         fbtft_unregister_framebuffer(info);
 516         fbtft_framebuffer_release(info);
 517
 518         return 0;
 519 }
 520
 521 static int flexfb_probe_spi(struct spi_device *spi)
 522 {
 523         return flexfb_probe_common(spi, NULL);
 524 }
 525
 526 static int flexfb_remove_spi(struct spi_device *spi)
 527 {
 528         struct fb_info *info = spi_get_drvdata(spi);
 529
 530         return flexfb_remove_common(&spi->dev, info);
 531 }
 532
 533 static int flexfb_probe_pdev(struct platform_device *pdev)
 534 {
 535         return flexfb_probe_common(NULL, pdev);
 536 }
 537
 538 static int flexfb_remove_pdev(struct platform_device *pdev)
 539 {
 540         struct fb_info *info = platform_get_drvdata(pdev);
 541
 542         return flexfb_remove_common(&pdev->dev, info);
 543 }
 544
 545 static struct spi_driver flexfb_spi_driver = {
 546         .driver = {
 547                 .name   = DRVNAME,
 548                 .owner  = THIS_MODULE,
 549         },
 550         .probe  = flexfb_probe_spi,
 551         .remove = flexfb_remove_spi,
 552 };
 553
 554 static const struct platform_device_id flexfb_platform_ids[] = {
 555         { "flexpfb", 0 },
 556         { },
 557 };
 558
 559 static struct platform_driver flexfb_platform_driver = {
 560         .driver = {
 561                 .name   = DRVNAME,
 562                 .owner  = THIS_MODULE,
 563         },
 564         .id_table = flexfb_platform_ids,
 565         .probe  = flexfb_probe_pdev,
 566         .remove = flexfb_remove_pdev,
 567 };
 568
 569 static int __init flexfb_init(void)
 570 {
 571         int ret, ret2;
 572
 573         ret = spi_register_driver(&flexfb_spi_driver);
 574         ret2 = platform_driver_register(&flexfb_platform_driver);
 575         if (ret < 0)
 576                 return ret;
 577         return ret2;
 578 }
 579
 580 static void __exit flexfb_exit(void)
 581 {
 582         spi_unregister_driver(&flexfb_spi_driver);
 583         platform_driver_unregister(&flexfb_platform_driver);
 584 }
 585
 586 /* ------------------------------------------------------------------------- */
 587
 588 module_init(flexfb_init);
 589 module_exit(flexfb_exit);
 590
 591 MODULE_DESCRIPTION("Generic FB driver for TFT LCD displays");
 592 MODULE_AUTHOR("Noralf Tronnes");
 593 MODULE_LICENSE("GPL");