drivers/video/auo_k190x.c

   1 /*
   2  * Common code for AUO-K190X framebuffer drivers
   3  *
   4  * Copyright (C) 2012 Heiko Stuebner <heiko@sntech.de>
   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 version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/gpio.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/fb.h>
  17 #include <linux/delay.h>
  18 #include <linux/uaccess.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/regulator/consumer.h>
  21
  22 #include <video/auo_k190xfb.h>
  23
  24 #include "auo_k190x.h"
  25
  26 struct panel_info {
  27         int w;
  28         int h;
  29 };
  30
  31 /* table of panel specific parameters to be indexed into by the board drivers */
  32 static struct panel_info panel_table[] = {
  33         /* standard 6" */
  34         [AUOK190X_RESOLUTION_800_600] = {
  35                 .w = 800,
  36                 .h = 600,
  37         },
  38         /* standard 9" */
  39         [AUOK190X_RESOLUTION_1024_768] = {
  40                 .w = 1024,
  41                 .h = 768,
  42         },
  43         [AUOK190X_RESOLUTION_600_800] = {
  44                 .w = 600,
  45                 .h = 800,
  46         },
  47         [AUOK190X_RESOLUTION_768_1024] = {
  48                 .w = 768,
  49                 .h = 1024,
  50         },
  51 };
  52
  53 /*
  54  * private I80 interface to the board driver
  55  */
  56
  57 static void auok190x_issue_data(struct auok190xfb_par *par, u16 data)
  58 {
  59         par->board->set_ctl(par, AUOK190X_I80_WR, 0);
  60         par->board->set_hdb(par, data);
  61         par->board->set_ctl(par, AUOK190X_I80_WR, 1);
  62 }
  63
  64 static void auok190x_issue_cmd(struct auok190xfb_par *par, u16 data)
  65 {
  66         par->board->set_ctl(par, AUOK190X_I80_DC, 0);
  67         auok190x_issue_data(par, data);
  68         par->board->set_ctl(par, AUOK190X_I80_DC, 1);
  69 }
  70
  71 /**
  72  * Conversion of 16bit color to 4bit grayscale
  73  * does roughly (0.3 * R + 0.6 G + 0.1 B) / 2
  74  */
  75 static inline int rgb565_to_gray4(u16 data, struct fb_var_screeninfo *var)
  76 {
  77         return ((((data & 0xF800) >> var->red.offset) * 77 +
  78                  ((data & 0x07E0) >> (var->green.offset + 1)) * 151 +
  79                  ((data & 0x1F) >> var->blue.offset) * 28) >> 8 >> 1);
  80 }
  81
  82 static int auok190x_issue_pixels_rgb565(struct auok190xfb_par *par, int size,
  83                                         u16 *data)
  84 {
  85         struct fb_var_screeninfo *var = &par->info->var;
  86         struct device *dev = par->info->device;
  87         int i;
  88         u16 tmp;
  89
  90         if (size & 7) {
  91                 dev_err(dev, "issue_pixels: size %d must be a multiple of 8\n",
  92                         size);
  93                 return -EINVAL;
  94         }
  95
  96         for (i = 0; i < (size >> 2); i++) {
  97                 par->board->set_ctl(par, AUOK190X_I80_WR, 0);
  98
  99                 tmp  = (rgb565_to_gray4(data[4*i], var) & 0x000F);
 100                 tmp |= (rgb565_to_gray4(data[4*i+1], var) << 4) & 0x00F0;
 101                 tmp |= (rgb565_to_gray4(data[4*i+2], var) << 8) & 0x0F00;
 102                 tmp |= (rgb565_to_gray4(data[4*i+3], var) << 12) & 0xF000;
 103
 104                 par->board->set_hdb(par, tmp);
 105                 par->board->set_ctl(par, AUOK190X_I80_WR, 1);
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int auok190x_issue_pixels_gray8(struct auok190xfb_par *par, int size,
 112                                        u16 *data)
 113 {
 114         struct device *dev = par->info->device;
 115         int i;
 116         u16 tmp;
 117
 118         if (size & 3) {
 119                 dev_err(dev, "issue_pixels: size %d must be a multiple of 4\n",
 120                         size);
 121                 return -EINVAL;
 122         }
 123
 124         for (i = 0; i < (size >> 1); i++) {
 125                 par->board->set_ctl(par, AUOK190X_I80_WR, 0);
 126
 127                 /* simple reduction of 8bit staticgray to 4bit gray
 128                  * combines 4 * 4bit pixel values into a 16bit value
 129                  */
 130                 tmp  = (data[2*i] & 0xF0) >> 4;
 131                 tmp |= (data[2*i] & 0xF000) >> 8;
 132                 tmp |= (data[2*i+1] & 0xF0) << 4;
 133                 tmp |= (data[2*i+1] & 0xF000);
 134
 135                 par->board->set_hdb(par, tmp);
 136                 par->board->set_ctl(par, AUOK190X_I80_WR, 1);
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int auok190x_issue_pixels(struct auok190xfb_par *par, int size,
 143                                  u16 *data)
 144 {
 145         struct fb_info *info = par->info;
 146         struct device *dev = par->info->device;
 147
 148         if (info->var.bits_per_pixel == 8 && info->var.grayscale)
 149                 auok190x_issue_pixels_gray8(par, size, data);
 150         else if (info->var.bits_per_pixel == 16)
 151                 auok190x_issue_pixels_rgb565(par, size, data);
 152         else
 153                 dev_err(dev, "unsupported color mode (bits: %d, gray: %d)\n",
 154                         info->var.bits_per_pixel, info->var.grayscale);
 155
 156         return 0;
 157 }
 158
 159 static u16 auok190x_read_data(struct auok190xfb_par *par)
 160 {
 161         u16 data;
 162
 163         par->board->set_ctl(par, AUOK190X_I80_OE, 0);
 164         data = par->board->get_hdb(par);
 165         par->board->set_ctl(par, AUOK190X_I80_OE, 1);
 166
 167         return data;
 168 }
 169
 170 /*
 171  * Command interface for the controller drivers
 172  */
 173
 174 void auok190x_send_command_nowait(struct auok190xfb_par *par, u16 data)
 175 {
 176         par->board->set_ctl(par, AUOK190X_I80_CS, 0);
 177         auok190x_issue_cmd(par, data);
 178         par->board->set_ctl(par, AUOK190X_I80_CS, 1);
 179 }
 180 EXPORT_SYMBOL_GPL(auok190x_send_command_nowait);
 181
 182 void auok190x_send_cmdargs_nowait(struct auok190xfb_par *par, u16 cmd,
 183                                   int argc, u16 *argv)
 184 {
 185         int i;
 186
 187         par->board->set_ctl(par, AUOK190X_I80_CS, 0);
 188         auok190x_issue_cmd(par, cmd);
 189
 190         for (i = 0; i < argc; i++)
 191                 auok190x_issue_data(par, argv[i]);
 192         par->board->set_ctl(par, AUOK190X_I80_CS, 1);
 193 }
 194 EXPORT_SYMBOL_GPL(auok190x_send_cmdargs_nowait);
 195
 196 int auok190x_send_command(struct auok190xfb_par *par, u16 data)
 197 {
 198         int ret;
 199
 200         ret = par->board->wait_for_rdy(par);
 201         if (ret)
 202                 return ret;
 203
 204         auok190x_send_command_nowait(par, data);
 205         return 0;
 206 }
 207 EXPORT_SYMBOL_GPL(auok190x_send_command);
 208
 209 int auok190x_send_cmdargs(struct auok190xfb_par *par, u16 cmd,
 210                            int argc, u16 *argv)
 211 {
 212         int ret;
 213
 214         ret = par->board->wait_for_rdy(par);
 215         if (ret)
 216                 return ret;
 217
 218         auok190x_send_cmdargs_nowait(par, cmd, argc, argv);
 219         return 0;
 220 }
 221 EXPORT_SYMBOL_GPL(auok190x_send_cmdargs);
 222
 223 int auok190x_read_cmdargs(struct auok190xfb_par *par, u16 cmd,
 224                            int argc, u16 *argv)
 225 {
 226         int i, ret;
 227
 228         ret = par->board->wait_for_rdy(par);
 229         if (ret)
 230                 return ret;
 231
 232         par->board->set_ctl(par, AUOK190X_I80_CS, 0);
 233         auok190x_issue_cmd(par, cmd);
 234
 235         for (i = 0; i < argc; i++)
 236                 argv[i] = auok190x_read_data(par);
 237         par->board->set_ctl(par, AUOK190X_I80_CS, 1);
 238
 239         return 0;
 240 }
 241 EXPORT_SYMBOL_GPL(auok190x_read_cmdargs);
 242
 243 void auok190x_send_cmdargs_pixels_nowait(struct auok190xfb_par *par, u16 cmd,
 244                                   int argc, u16 *argv, int size, u16 *data)
 245 {
 246         int i;
 247
 248         par->board->set_ctl(par, AUOK190X_I80_CS, 0);
 249
 250         auok190x_issue_cmd(par, cmd);
 251
 252         for (i = 0; i < argc; i++)
 253                 auok190x_issue_data(par, argv[i]);
 254
 255         auok190x_issue_pixels(par, size, data);
 256
 257         par->board->set_ctl(par, AUOK190X_I80_CS, 1);
 258 }
 259 EXPORT_SYMBOL_GPL(auok190x_send_cmdargs_pixels_nowait);
 260
 261 int auok190x_send_cmdargs_pixels(struct auok190xfb_par *par, u16 cmd,
 262                                   int argc, u16 *argv, int size, u16 *data)
 263 {
 264         int ret;
 265
 266         ret = par->board->wait_for_rdy(par);
 267         if (ret)
 268                 return ret;
 269
 270         auok190x_send_cmdargs_pixels_nowait(par, cmd, argc, argv, size, data);
 271
 272         return 0;
 273 }
 274 EXPORT_SYMBOL_GPL(auok190x_send_cmdargs_pixels);
 275
 276 /*
 277  * fbdefio callbacks - common on both controllers.
 278  */
 279
 280 static void auok190xfb_dpy_first_io(struct fb_info *info)
 281 {
 282         /* tell runtime-pm that we wish to use the device in a short time */
 283         pm_runtime_get(info->device);
 284 }
 285
 286 /* this is called back from the deferred io workqueue */
 287 static void auok190xfb_dpy_deferred_io(struct fb_info *info,
 288                                 struct list_head *pagelist)
 289 {
 290         struct fb_deferred_io *fbdefio = info->fbdefio;
 291         struct auok190xfb_par *par = info->par;
 292         u16 line_length = info->fix.line_length;
 293         u16 yres = info->var.yres;
 294         u16 y1 = 0, h = 0;
 295         int prev_index = -1;
 296         struct page *cur;
 297         int h_inc;
 298         int threshold;
 299
 300         if (!list_empty(pagelist))
 301                 /* the device resume should've been requested through first_io,
 302                  * if the resume did not finish until now, wait for it.
 303                  */
 304                 pm_runtime_barrier(info->device);
 305         else
 306                 /* We reached this via the fsync or some other way.
 307                  * In either case the first_io function did not run,
 308                  * so we runtime_resume the device here synchronously.
 309                  */
 310                 pm_runtime_get_sync(info->device);
 311
 312         /* Do a full screen update every n updates to prevent
 313          * excessive darkening of the Sipix display.
 314          * If we do this, there is no need to walk the pages.
 315          */
 316         if (par->need_refresh(par)) {
 317                 par->update_all(par);
 318                 goto out;
 319         }
 320
 321         /* height increment is fixed per page */
 322         h_inc = DIV_ROUND_UP(PAGE_SIZE , line_length);
 323
 324         /* calculate number of pages from pixel height */
 325         threshold = par->consecutive_threshold / h_inc;
 326         if (threshold < 1)
 327                 threshold = 1;
 328
 329         /* walk the written page list and swizzle the data */
 330         list_for_each_entry(cur, &fbdefio->pagelist, lru) {
 331                 if (prev_index < 0) {
 332                         /* just starting so assign first page */
 333                         y1 = (cur->index << PAGE_SHIFT) / line_length;
 334                         h = h_inc;
 335                 } else if ((cur->index - prev_index) <= threshold) {
 336                         /* page is within our threshold for single updates */
 337                         h += h_inc * (cur->index - prev_index);
 338                 } else {
 339                         /* page not consecutive, issue previous update first */
 340                         par->update_partial(par, y1, y1 + h);
 341
 342                         /* start over with our non consecutive page */
 343                         y1 = (cur->index << PAGE_SHIFT) / line_length;
 344                         h = h_inc;
 345                 }
 346                 prev_index = cur->index;
 347         }
 348
 349         /* if we still have any pages to update we do so now */
 350         if (h >= yres)
 351                 /* its a full screen update, just do it */
 352                 par->update_all(par);
 353         else
 354                 par->update_partial(par, y1, min((u16) (y1 + h), yres));
 355
 356 out:
 357         pm_runtime_mark_last_busy(info->device);
 358         pm_runtime_put_autosuspend(info->device);
 359 }
 360
 361 /*
 362  * framebuffer operations
 363  */
 364
 365 /*
 366  * this is the slow path from userspace. they can seek and write to
 367  * the fb. it's inefficient to do anything less than a full screen draw
 368  */
 369 static ssize_t auok190xfb_write(struct fb_info *info, const char __user *buf,
 370                                 size_t count, loff_t *ppos)
 371 {
 372         struct auok190xfb_par *par = info->par;
 373         unsigned long p = *ppos;
 374         void *dst;
 375         int err = 0;
 376         unsigned long total_size;
 377
 378         if (info->state != FBINFO_STATE_RUNNING)
 379                 return -EPERM;
 380
 381         total_size = info->fix.smem_len;
 382
 383         if (p > total_size)
 384                 return -EFBIG;
 385
 386         if (count > total_size) {
 387                 err = -EFBIG;
 388                 count = total_size;
 389         }
 390
 391         if (count + p > total_size) {
 392                 if (!err)
 393                         err = -ENOSPC;
 394
 395                 count = total_size - p;
 396         }
 397
 398         dst = (void *)(info->screen_base + p);
 399
 400         if (copy_from_user(dst, buf, count))
 401                 err = -EFAULT;
 402
 403         if  (!err)
 404                 *ppos += count;
 405
 406         par->update_all(par);
 407
 408         return (err) ? err : count;
 409 }
 410
 411 static void auok190xfb_fillrect(struct fb_info *info,
 412                                    const struct fb_fillrect *rect)
 413 {
 414         struct auok190xfb_par *par = info->par;
 415
 416         sys_fillrect(info, rect);
 417
 418         par->update_all(par);
 419 }
 420
 421 static void auok190xfb_copyarea(struct fb_info *info,
 422                                    const struct fb_copyarea *area)
 423 {
 424         struct auok190xfb_par *par = info->par;
 425
 426         sys_copyarea(info, area);
 427
 428         par->update_all(par);
 429 }
 430
 431 static void auok190xfb_imageblit(struct fb_info *info,
 432                                 const struct fb_image *image)
 433 {
 434         struct auok190xfb_par *par = info->par;
 435
 436         sys_imageblit(info, image);
 437
 438         par->update_all(par);
 439 }
 440
 441 static int auok190xfb_check_var(struct fb_var_screeninfo *var,
 442                                    struct fb_info *info)
 443 {
 444         struct device *dev = info->device;
 445         struct auok190xfb_par *par = info->par;
 446         struct panel_info *panel = &panel_table[par->resolution];
 447         int size;
 448
 449         /*
 450          * Color depth
 451          */
 452
 453         if (var->bits_per_pixel == 8 && var->grayscale == 1) {
 454                 /*
 455                  * For 8-bit grayscale, R, G, and B offset are equal.
 456                  */
 457                 var->red.length = 8;
 458                 var->red.offset = 0;
 459                 var->red.msb_right = 0;
 460
 461                 var->green.length = 8;
 462                 var->green.offset = 0;
 463                 var->green.msb_right = 0;
 464
 465                 var->blue.length = 8;
 466                 var->blue.offset = 0;
 467                 var->blue.msb_right = 0;
 468
 469                 var->transp.length = 0;
 470                 var->transp.offset = 0;
 471                 var->transp.msb_right = 0;
 472         } else if (var->bits_per_pixel == 16) {
 473                 var->red.length = 5;
 474                 var->red.offset = 11;
 475                 var->red.msb_right = 0;
 476
 477                 var->green.length = 6;
 478                 var->green.offset = 5;
 479                 var->green.msb_right = 0;
 480
 481                 var->blue.length = 5;
 482                 var->blue.offset = 0;
 483                 var->blue.msb_right = 0;
 484
 485                 var->transp.length = 0;
 486                 var->transp.offset = 0;
 487                 var->transp.msb_right = 0;
 488         } else {
 489                 dev_warn(dev, "unsupported color mode (bits: %d, grayscale: %d)\n",
 490                         info->var.bits_per_pixel, info->var.grayscale);
 491                 return -EINVAL;
 492         }
 493
 494         /*
 495          * Dimensions
 496          */
 497
 498         switch (var->rotate) {
 499         case FB_ROTATE_UR:
 500         case FB_ROTATE_UD:
 501                 var->xres = panel->w;
 502                 var->yres = panel->h;
 503                 break;
 504         case FB_ROTATE_CW:
 505         case FB_ROTATE_CCW:
 506                 var->xres = panel->h;
 507                 var->yres = panel->w;
 508                 break;
 509         default:
 510                 dev_dbg(dev, "Invalid rotation request\n");
 511                 return -EINVAL;
 512         }
 513
 514         var->xres_virtual = var->xres;
 515         var->yres_virtual = var->yres;
 516
 517         /*
 518          *  Memory limit
 519          */
 520
 521         size = var->xres_virtual * var->yres_virtual * var->bits_per_pixel / 8;
 522         if (size > info->fix.smem_len) {
 523                 dev_err(dev, "Memory limit exceeded, requested %dK\n",
 524                         size >> 10);
 525                 return -ENOMEM;
 526         }
 527
 528         return 0;
 529 }
 530
 531 static int auok190xfb_set_fix(struct fb_info *info)
 532 {
 533         struct fb_fix_screeninfo *fix = &info->fix;
 534         struct fb_var_screeninfo *var = &info->var;
 535
 536         fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
 537
 538         fix->type = FB_TYPE_PACKED_PIXELS;
 539         fix->accel = FB_ACCEL_NONE;
 540         fix->visual = (var->grayscale) ? FB_VISUAL_STATIC_PSEUDOCOLOR
 541                                        : FB_VISUAL_TRUECOLOR;
 542         fix->xpanstep = 0;
 543         fix->ypanstep = 0;
 544         fix->ywrapstep = 0;
 545
 546         return 0;
 547 }
 548
 549 static int auok190xfb_set_par(struct fb_info *info)
 550 {
 551         struct auok190xfb_par *par = info->par;
 552
 553         par->rotation = info->var.rotate;
 554         auok190xfb_set_fix(info);
 555
 556         /* reinit the controller to honor the rotation */
 557         par->init(par);
 558
 559         /* wait for init to complete */
 560         par->board->wait_for_rdy(par);
 561
 562         return 0;
 563 }
 564
 565 static struct fb_ops auok190xfb_ops = {
 566         .owner          = THIS_MODULE,
 567         .fb_read        = fb_sys_read,
 568         .fb_write       = auok190xfb_write,
 569         .fb_fillrect    = auok190xfb_fillrect,
 570         .fb_copyarea    = auok190xfb_copyarea,
 571         .fb_imageblit   = auok190xfb_imageblit,
 572         .fb_check_var   = auok190xfb_check_var,
 573         .fb_set_par     = auok190xfb_set_par,
 574 };
 575
 576 /*
 577  * Controller-functions common to both K1900 and K1901
 578  */
 579
 580 static int auok190x_read_temperature(struct auok190xfb_par *par)
 581 {
 582         struct device *dev = par->info->device;
 583         u16 data[4];
 584         int temp;
 585
 586         pm_runtime_get_sync(dev);
 587
 588         mutex_lock(&(par->io_lock));
 589
 590         auok190x_read_cmdargs(par, AUOK190X_CMD_READ_VERSION, 4, data);
 591
 592         mutex_unlock(&(par->io_lock));
 593
 594         pm_runtime_mark_last_busy(dev);
 595         pm_runtime_put_autosuspend(dev);
 596
 597         /* sanitize and split of half-degrees for now */
 598         temp = ((data[0] & AUOK190X_VERSION_TEMP_MASK) >> 1);
 599
 600         /* handle positive and negative temperatures */
 601         if (temp >= 201)
 602                 return (255 - temp + 1) * (-1);
 603         else
 604                 return temp;
 605 }
 606
 607 static void auok190x_identify(struct auok190xfb_par *par)
 608 {
 609         struct device *dev = par->info->device;
 610         u16 data[4];
 611
 612         pm_runtime_get_sync(dev);
 613
 614         mutex_lock(&(par->io_lock));
 615
 616         auok190x_read_cmdargs(par, AUOK190X_CMD_READ_VERSION, 4, data);
 617
 618         mutex_unlock(&(par->io_lock));
 619
 620         par->epd_type = data[1] & AUOK190X_VERSION_TEMP_MASK;
 621
 622         par->panel_size_int = AUOK190X_VERSION_SIZE_INT(data[2]);
 623         par->panel_size_float = AUOK190X_VERSION_SIZE_FLOAT(data[2]);
 624         par->panel_model = AUOK190X_VERSION_MODEL(data[2]);
 625
 626         par->tcon_version = AUOK190X_VERSION_TCON(data[3]);
 627         par->lut_version = AUOK190X_VERSION_LUT(data[3]);
 628
 629         dev_dbg(dev, "panel %d.%din, model 0x%x, EPD 0x%x TCON-rev 0x%x, LUT-rev 0x%x",
 630                 par->panel_size_int, par->panel_size_float, par->panel_model,
 631                 par->epd_type, par->tcon_version, par->lut_version);
 632
 633         pm_runtime_mark_last_busy(dev);
 634         pm_runtime_put_autosuspend(dev);
 635 }
 636
 637 /*
 638  * Sysfs functions
 639  */
 640
 641 static ssize_t update_mode_show(struct device *dev,
 642                                 struct device_attribute *attr, char *buf)
 643 {
 644         struct fb_info *info = dev_get_drvdata(dev);
 645         struct auok190xfb_par *par = info->par;
 646
 647         return sprintf(buf, "%d\n", par->update_mode);
 648 }
 649
 650 static ssize_t update_mode_store(struct device *dev,
 651                                  struct device_attribute *attr,
 652                                  const char *buf, size_t count)
 653 {
 654         struct fb_info *info = dev_get_drvdata(dev);
 655         struct auok190xfb_par *par = info->par;
 656         int mode, ret;
 657
 658         ret = kstrtoint(buf, 10, &mode);
 659         if (ret)
 660                 return ret;
 661
 662         par->update_mode = mode;
 663
 664         /* if we enter a better mode, do a full update */
 665         if (par->last_mode > 1 && mode < par->last_mode)
 666                 par->update_all(par);
 667
 668         return count;
 669 }
 670
 671 static ssize_t flash_show(struct device *dev, struct device_attribute *attr,
 672                           char *buf)
 673 {
 674         struct fb_info *info = dev_get_drvdata(dev);
 675         struct auok190xfb_par *par = info->par;
 676
 677         return sprintf(buf, "%d\n", par->flash);
 678 }
 679
 680 static ssize_t flash_store(struct device *dev, struct device_attribute *attr,
 681                            const char *buf, size_t count)
 682 {
 683         struct fb_info *info = dev_get_drvdata(dev);
 684         struct auok190xfb_par *par = info->par;
 685         int flash, ret;
 686
 687         ret = kstrtoint(buf, 10, &flash);
 688         if (ret)
 689                 return ret;
 690
 691         if (flash > 0)
 692                 par->flash = 1;
 693         else
 694                 par->flash = 0;
 695
 696         return count;
 697 }
 698
 699 static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
 700                          char *buf)
 701 {
 702         struct fb_info *info = dev_get_drvdata(dev);
 703         struct auok190xfb_par *par = info->par;
 704         int temp;
 705
 706         temp = auok190x_read_temperature(par);
 707         return sprintf(buf, "%d\n", temp);
 708 }
 709
 710 static DEVICE_ATTR(update_mode, 0644, update_mode_show, update_mode_store);
 711 static DEVICE_ATTR(flash, 0644, flash_show, flash_store);
 712 static DEVICE_ATTR(temp, 0644, temp_show, NULL);
 713
 714 static struct attribute *auok190x_attributes[] = {
 715         &dev_attr_update_mode.attr,
 716         &dev_attr_flash.attr,
 717         &dev_attr_temp.attr,
 718         NULL
 719 };
 720
 721 static const struct attribute_group auok190x_attr_group = {
 722         .attrs          = auok190x_attributes,
 723 };
 724
 725 static int auok190x_power(struct auok190xfb_par *par, bool on)
 726 {
 727         struct auok190x_board *board = par->board;
 728         int ret;
 729
 730         if (on) {
 731                 /* We should maintain POWER up for at least 80ms before set
 732                  * RST_N and SLP_N to high (TCON spec 20100803_v35 p59)
 733                  */
 734                 ret = regulator_enable(par->regulator);
 735                 if (ret)
 736                         return ret;
 737
 738                 msleep(200);
 739                 gpio_set_value(board->gpio_nrst, 1);
 740                 gpio_set_value(board->gpio_nsleep, 1);
 741                 msleep(200);
 742         } else {
 743                 regulator_disable(par->regulator);
 744                 gpio_set_value(board->gpio_nrst, 0);
 745                 gpio_set_value(board->gpio_nsleep, 0);
 746         }
 747
 748         return 0;
 749 }
 750
 751 /*
 752  * Recovery - powercycle the controller
 753  */
 754
 755 static void auok190x_recover(struct auok190xfb_par *par)
 756 {
 757         struct device *dev = par->info->device;
 758
 759         auok190x_power(par, 0);
 760         msleep(100);
 761         auok190x_power(par, 1);
 762
 763         /* after powercycling the device, it's always active */
 764         pm_runtime_set_active(dev);
 765         par->standby = 0;
 766
 767         par->init(par);
 768
 769         /* wait for init to complete */
 770         par->board->wait_for_rdy(par);
 771 }
 772
 773 /*
 774  * Power-management
 775  */
 776
 777 #ifdef CONFIG_PM
 778 static int auok190x_runtime_suspend(struct device *dev)
 779 {
 780         struct platform_device *pdev = to_platform_device(dev);
 781         struct fb_info *info = platform_get_drvdata(pdev);
 782         struct auok190xfb_par *par = info->par;
 783         struct auok190x_board *board = par->board;
 784         u16 standby_param;
 785
 786         /* take and keep the lock until we are resumed, as the controller
 787          * will never reach the non-busy state when in standby mode
 788          */
 789         mutex_lock(&(par->io_lock));
 790
 791         if (par->standby) {
 792                 dev_warn(dev, "already in standby, runtime-pm pairing mismatch\n");
 793                 mutex_unlock(&(par->io_lock));
 794                 return 0;
 795         }
 796
 797         /* according to runtime_pm.txt runtime_suspend only means, that the
 798          * device will not process data and will not communicate with the CPU
 799          * As we hold the lock, this stays true even without standby
 800          */
 801         if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
 802                 dev_dbg(dev, "runtime suspend without standby\n");
 803                 goto finish;
 804         } else if (board->quirks & AUOK190X_QUIRK_STANDBYPARAM) {
 805                 /* for some TCON versions STANDBY expects a parameter (0) but
 806                  * it seems the real tcon version has to be determined yet.
 807                  */
 808                 dev_dbg(dev, "runtime suspend with additional empty param\n");
 809                 standby_param = 0;
 810                 auok190x_send_cmdargs(par, AUOK190X_CMD_STANDBY, 1,
 811                                       &standby_param);
 812         } else {
 813                 dev_dbg(dev, "runtime suspend without param\n");
 814                 auok190x_send_command(par, AUOK190X_CMD_STANDBY);
 815         }
 816
 817         msleep(64);
 818
 819 finish:
 820         par->standby = 1;
 821
 822         return 0;
 823 }
 824
 825 static int auok190x_runtime_resume(struct device *dev)
 826 {
 827         struct platform_device *pdev = to_platform_device(dev);
 828         struct fb_info *info = platform_get_drvdata(pdev);
 829         struct auok190xfb_par *par = info->par;
 830         struct auok190x_board *board = par->board;
 831
 832         if (!par->standby) {
 833                 dev_warn(dev, "not in standby, runtime-pm pairing mismatch\n");
 834                 return 0;
 835         }
 836
 837         if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
 838                 dev_dbg(dev, "runtime resume without standby\n");
 839         } else {
 840                 /* when in standby, controller is always busy
 841                  * and only accepts the wakeup command
 842                  */
 843                 dev_dbg(dev, "runtime resume from standby\n");
 844                 auok190x_send_command_nowait(par, AUOK190X_CMD_WAKEUP);
 845
 846                 msleep(160);
 847
 848                 /* wait for the controller to be ready and release the lock */
 849                 board->wait_for_rdy(par);
 850         }
 851
 852         par->standby = 0;
 853
 854         mutex_unlock(&(par->io_lock));
 855
 856         return 0;
 857 }
 858
 859 static int auok190x_suspend(struct device *dev)
 860 {
 861         struct platform_device *pdev = to_platform_device(dev);
 862         struct fb_info *info = platform_get_drvdata(pdev);
 863         struct auok190xfb_par *par = info->par;
 864         struct auok190x_board *board = par->board;
 865         int ret;
 866
 867         dev_dbg(dev, "suspend\n");
 868         if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
 869                 /* suspend via powering off the ic */
 870                 dev_dbg(dev, "suspend with broken standby\n");
 871
 872                 auok190x_power(par, 0);
 873         } else {
 874                 dev_dbg(dev, "suspend using sleep\n");
 875
 876                 /* the sleep state can only be entered from the standby state.
 877                  * pm_runtime_get_noresume gets called before the suspend call.
 878                  * So the devices usage count is >0 but it is not necessarily
 879                  * active.
 880                  */
 881                 if (!pm_runtime_status_suspended(dev)) {
 882                         ret = auok190x_runtime_suspend(dev);
 883                         if (ret < 0) {
 884                                 dev_err(dev, "auok190x_runtime_suspend failed with %d\n",
 885                                         ret);
 886                                 return ret;
 887                         }
 888                         par->manual_standby = 1;
 889                 }
 890
 891                 gpio_direction_output(board->gpio_nsleep, 0);
 892         }
 893
 894         msleep(100);
 895
 896         return 0;
 897 }
 898
 899 static int auok190x_resume(struct device *dev)
 900 {
 901         struct platform_device *pdev = to_platform_device(dev);
 902         struct fb_info *info = platform_get_drvdata(pdev);
 903         struct auok190xfb_par *par = info->par;
 904         struct auok190x_board *board = par->board;
 905
 906         dev_dbg(dev, "resume\n");
 907         if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
 908                 dev_dbg(dev, "resume with broken standby\n");
 909
 910                 auok190x_power(par, 1);
 911
 912                 par->init(par);
 913         } else {
 914                 dev_dbg(dev, "resume from sleep\n");
 915
 916                 /* device should be in runtime suspend when we were suspended
 917                  * and pm_runtime_put_sync gets called after this function.
 918                  * So there is no need to touch the standby mode here at all.
 919                  */
 920                 gpio_direction_output(board->gpio_nsleep, 1);
 921                 msleep(100);
 922
 923                 /* an additional init call seems to be necessary after sleep */
 924                 auok190x_runtime_resume(dev);
 925                 par->init(par);
 926
 927                 /* if we were runtime-suspended before, suspend again*/
 928                 if (!par->manual_standby)
 929                         auok190x_runtime_suspend(dev);
 930                 else
 931                         par->manual_standby = 0;
 932         }
 933
 934         return 0;
 935 }
 936 #endif
 937
 938 const struct dev_pm_ops auok190x_pm = {
 939         SET_RUNTIME_PM_OPS(auok190x_runtime_suspend, auok190x_runtime_resume,
 940                            NULL)
 941         SET_SYSTEM_SLEEP_PM_OPS(auok190x_suspend, auok190x_resume)
 942 };
 943 EXPORT_SYMBOL_GPL(auok190x_pm);
 944
 945 /*
 946  * Common probe and remove code
 947  */
 948
 949 int auok190x_common_probe(struct platform_device *pdev,
 950                           struct auok190x_init_data *init)
 951 {
 952         struct auok190x_board *board = init->board;
 953         struct auok190xfb_par *par;
 954         struct fb_info *info;
 955         struct panel_info *panel;
 956         int videomemorysize, ret;
 957         unsigned char *videomemory;
 958
 959         /* check board contents */
 960         if (!board->init || !board->cleanup || !board->wait_for_rdy
 961             || !board->set_ctl || !board->set_hdb || !board->get_hdb
 962             || !board->setup_irq)
 963                 return -EINVAL;
 964
 965         info = framebuffer_alloc(sizeof(struct auok190xfb_par), &pdev->dev);
 966         if (!info)
 967                 return -ENOMEM;
 968
 969         par = info->par;
 970         par->info = info;
 971         par->board = board;
 972         par->recover = auok190x_recover;
 973         par->update_partial = init->update_partial;
 974         par->update_all = init->update_all;
 975         par->need_refresh = init->need_refresh;
 976         par->init = init->init;
 977
 978         /* init update modes */
 979         par->update_cnt = 0;
 980         par->update_mode = -1;
 981         par->last_mode = -1;
 982         par->flash = 0;
 983
 984         par->regulator = regulator_get(info->device, "vdd");
 985         if (IS_ERR(par->regulator)) {
 986                 ret = PTR_ERR(par->regulator);
 987                 dev_err(info->device, "Failed to get regulator: %d\n", ret);
 988                 goto err_reg;
 989         }
 990
 991         ret = board->init(par);
 992         if (ret) {
 993                 dev_err(info->device, "board init failed, %d\n", ret);
 994                 goto err_board;
 995         }
 996
 997         ret = gpio_request(board->gpio_nsleep, "AUOK190x sleep");
 998         if (ret) {
 999                 dev_err(info->device, "could not request sleep gpio, %d\n",
1000                         ret);
1001                 goto err_gpio1;
1002         }
1003
1004         ret = gpio_direction_output(board->gpio_nsleep, 0);
1005         if (ret) {
1006                 dev_err(info->device, "could not set sleep gpio, %d\n", ret);
1007                 goto err_gpio2;
1008         }
1009
1010         ret = gpio_request(board->gpio_nrst, "AUOK190x reset");
1011         if (ret) {
1012                 dev_err(info->device, "could not request reset gpio, %d\n",
1013                         ret);
1014                 goto err_gpio2;
1015         }
1016
1017         ret = gpio_direction_output(board->gpio_nrst, 0);
1018         if (ret) {
1019                 dev_err(info->device, "could not set reset gpio, %d\n", ret);
1020                 goto err_gpio3;
1021         }
1022
1023         ret = auok190x_power(par, 1);
1024         if (ret) {
1025                 dev_err(info->device, "could not power on the device, %d\n",
1026                         ret);
1027                 goto err_gpio3;
1028         }
1029
1030         mutex_init(&par->io_lock);
1031
1032         init_waitqueue_head(&par->waitq);
1033
1034         ret = par->board->setup_irq(par->info);
1035         if (ret) {
1036                 dev_err(info->device, "could not setup ready-irq, %d\n", ret);
1037                 goto err_irq;
1038         }
1039
1040         /* wait for init to complete */
1041         par->board->wait_for_rdy(par);
1042
1043         /*
1044          * From here on the controller can talk to us
1045          */
1046
1047         /* initialise fix, var, resolution and rotation */
1048
1049         strlcpy(info->fix.id, init->id, 16);
1050         info->var.bits_per_pixel = 8;
1051         info->var.grayscale = 1;
1052
1053         panel = &panel_table[board->resolution];
1054
1055         par->resolution = board->resolution;
1056         par->rotation = 0;
1057
1058         /* videomemory handling */
1059
1060         videomemorysize = roundup((panel->w * panel->h) * 2, PAGE_SIZE);
1061         videomemory = vmalloc(videomemorysize);
1062         if (!videomemory) {
1063                 ret = -ENOMEM;
1064                 goto err_irq;
1065         }
1066
1067         memset(videomemory, 0, videomemorysize);
1068         info->screen_base = (char *)videomemory;
1069         info->fix.smem_len = videomemorysize;
1070
1071         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
1072         info->fbops = &auok190xfb_ops;
1073
1074         ret = auok190xfb_check_var(&info->var, info);
1075         if (ret)
1076                 goto err_defio;
1077
1078         auok190xfb_set_fix(info);
1079
1080         /* deferred io init */
1081
1082         info->fbdefio = devm_kzalloc(info->device,
1083                                      sizeof(struct fb_deferred_io),
1084                                      GFP_KERNEL);
1085         if (!info->fbdefio) {
1086                 dev_err(info->device, "Failed to allocate memory\n");
1087                 ret = -ENOMEM;
1088                 goto err_defio;
1089         }
1090
1091         dev_dbg(info->device, "targeting %d frames per second\n", board->fps);
1092         info->fbdefio->delay = HZ / board->fps;
1093         info->fbdefio->first_io = auok190xfb_dpy_first_io,
1094         info->fbdefio->deferred_io = auok190xfb_dpy_deferred_io,
1095         fb_deferred_io_init(info);
1096
1097         /* color map */
1098
1099         ret = fb_alloc_cmap(&info->cmap, 256, 0);
1100         if (ret < 0) {
1101                 dev_err(info->device, "Failed to allocate colormap\n");
1102                 goto err_cmap;
1103         }
1104
1105         /* controller init */
1106
1107         par->consecutive_threshold = 100;
1108         par->init(par);
1109         auok190x_identify(par);
1110
1111         platform_set_drvdata(pdev, info);
1112
1113         ret = register_framebuffer(info);
1114         if (ret < 0)
1115                 goto err_regfb;
1116
1117         ret = sysfs_create_group(&info->device->kobj, &auok190x_attr_group);
1118         if (ret)
1119                 goto err_sysfs;
1120
1121         dev_info(info->device, "fb%d: %dx%d using %dK of video memory\n",
1122                  info->node, info->var.xres, info->var.yres,
1123                  videomemorysize >> 10);
1124
1125         /* increase autosuspend_delay when we use alternative methods
1126          * for runtime_pm
1127          */
1128         par->autosuspend_delay = (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN)
1129                                         ? 1000 : 200;
1130
1131         pm_runtime_set_active(info->device);
1132         pm_runtime_enable(info->device);
1133         pm_runtime_set_autosuspend_delay(info->device, par->autosuspend_delay);
1134         pm_runtime_use_autosuspend(info->device);
1135
1136         return 0;
1137
1138 err_sysfs:
1139         unregister_framebuffer(info);
1140 err_regfb:
1141         fb_dealloc_cmap(&info->cmap);
1142 err_cmap:
1143         fb_deferred_io_cleanup(info);
1144 err_defio:
1145         vfree((void *)info->screen_base);
1146 err_irq:
1147         auok190x_power(par, 0);
1148 err_gpio3:
1149         gpio_free(board->gpio_nrst);
1150 err_gpio2:
1151         gpio_free(board->gpio_nsleep);
1152 err_gpio1:
1153         board->cleanup(par);
1154 err_board:
1155         regulator_put(par->regulator);
1156 err_reg:
1157         framebuffer_release(info);
1158
1159         return ret;
1160 }
1161 EXPORT_SYMBOL_GPL(auok190x_common_probe);
1162
1163 int  auok190x_common_remove(struct platform_device *pdev)
1164 {
1165         struct fb_info *info = platform_get_drvdata(pdev);
1166         struct auok190xfb_par *par = info->par;
1167         struct auok190x_board *board = par->board;
1168
1169         pm_runtime_disable(info->device);
1170
1171         sysfs_remove_group(&info->device->kobj, &auok190x_attr_group);
1172
1173         unregister_framebuffer(info);
1174
1175         fb_dealloc_cmap(&info->cmap);
1176
1177         fb_deferred_io_cleanup(info);
1178
1179         vfree((void *)info->screen_base);
1180
1181         auok190x_power(par, 0);
1182
1183         gpio_free(board->gpio_nrst);
1184         gpio_free(board->gpio_nsleep);
1185
1186         board->cleanup(par);
1187
1188         regulator_put(par->regulator);
1189
1190         framebuffer_release(info);
1191
1192         return 0;
1193 }
1194 EXPORT_SYMBOL_GPL(auok190x_common_remove);
1195
1196 MODULE_DESCRIPTION("Common code for AUO-K190X controllers");
1197 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
1198 MODULE_LICENSE("GPL");