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
auok190x_issue_data(struct auok190xfb_par * par,u16 data)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
auok190x_issue_cmd(struct auok190xfb_par * par,u16 data)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 */
rgb565_to_gray4(u16 data,struct fb_var_screeninfo * var)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
auok190x_issue_pixels_rgb565(struct auok190xfb_par * par,int size,u16 * data)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
auok190x_issue_pixels_gray8(struct auok190xfb_par * par,int size,u16 * data)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
auok190x_issue_pixels(struct auok190xfb_par * par,int size,u16 * data)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
auok190x_read_data(struct auok190xfb_par * par)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
auok190x_send_command_nowait(struct auok190xfb_par * par,u16 data)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
auok190x_send_cmdargs_nowait(struct auok190xfb_par * par,u16 cmd,int argc,u16 * argv)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
auok190x_send_command(struct auok190xfb_par * par,u16 data)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
auok190x_send_cmdargs(struct auok190xfb_par * par,u16 cmd,int argc,u16 * argv)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
auok190x_read_cmdargs(struct auok190xfb_par * par,u16 cmd,int argc,u16 * argv)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
auok190x_send_cmdargs_pixels_nowait(struct auok190xfb_par * par,u16 cmd,int argc,u16 * argv,int size,u16 * data)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
auok190x_send_cmdargs_pixels(struct auok190xfb_par * par,u16 cmd,int argc,u16 * argv,int size,u16 * data)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
auok190xfb_dpy_first_io(struct fb_info * info)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 */
auok190xfb_dpy_deferred_io(struct fb_info * info,struct list_head * pagelist)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 */
auok190xfb_write(struct fb_info * info,const char __user * buf,size_t count,loff_t * ppos)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
auok190xfb_fillrect(struct fb_info * info,const struct fb_fillrect * rect)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
auok190xfb_copyarea(struct fb_info * info,const struct fb_copyarea * area)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
auok190xfb_imageblit(struct fb_info * info,const struct fb_image * image)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
auok190xfb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)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
auok190xfb_set_fix(struct fb_info * info)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
auok190xfb_set_par(struct fb_info * info)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
auok190x_read_temperature(struct auok190xfb_par * par)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
auok190x_identify(struct auok190xfb_par * par)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
update_mode_show(struct device * dev,struct device_attribute * attr,char * buf)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
update_mode_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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
flash_show(struct device * dev,struct device_attribute * attr,char * buf)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
flash_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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
temp_show(struct device * dev,struct device_attribute * attr,char * buf)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
auok190x_power(struct auok190xfb_par * par,bool on)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
auok190x_recover(struct auok190xfb_par * par)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 */
auok190x_runtime_suspend(struct device * dev)776 static int __maybe_unused auok190x_runtime_suspend(struct device *dev)
777 {
778 struct platform_device *pdev = to_platform_device(dev);
779 struct fb_info *info = platform_get_drvdata(pdev);
780 struct auok190xfb_par *par = info->par;
781 struct auok190x_board *board = par->board;
782 u16 standby_param;
783
784 /* take and keep the lock until we are resumed, as the controller
785 * will never reach the non-busy state when in standby mode
786 */
787 mutex_lock(&(par->io_lock));
788
789 if (par->standby) {
790 dev_warn(dev, "already in standby, runtime-pm pairing mismatch\n");
791 mutex_unlock(&(par->io_lock));
792 return 0;
793 }
794
795 /* according to runtime_pm.txt runtime_suspend only means, that the
796 * device will not process data and will not communicate with the CPU
797 * As we hold the lock, this stays true even without standby
798 */
799 if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
800 dev_dbg(dev, "runtime suspend without standby\n");
801 goto finish;
802 } else if (board->quirks & AUOK190X_QUIRK_STANDBYPARAM) {
803 /* for some TCON versions STANDBY expects a parameter (0) but
804 * it seems the real tcon version has to be determined yet.
805 */
806 dev_dbg(dev, "runtime suspend with additional empty param\n");
807 standby_param = 0;
808 auok190x_send_cmdargs(par, AUOK190X_CMD_STANDBY, 1,
809 &standby_param);
810 } else {
811 dev_dbg(dev, "runtime suspend without param\n");
812 auok190x_send_command(par, AUOK190X_CMD_STANDBY);
813 }
814
815 msleep(64);
816
817 finish:
818 par->standby = 1;
819
820 return 0;
821 }
822
auok190x_runtime_resume(struct device * dev)823 static int __maybe_unused auok190x_runtime_resume(struct device *dev)
824 {
825 struct platform_device *pdev = to_platform_device(dev);
826 struct fb_info *info = platform_get_drvdata(pdev);
827 struct auok190xfb_par *par = info->par;
828 struct auok190x_board *board = par->board;
829
830 if (!par->standby) {
831 dev_warn(dev, "not in standby, runtime-pm pairing mismatch\n");
832 return 0;
833 }
834
835 if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
836 dev_dbg(dev, "runtime resume without standby\n");
837 } else {
838 /* when in standby, controller is always busy
839 * and only accepts the wakeup command
840 */
841 dev_dbg(dev, "runtime resume from standby\n");
842 auok190x_send_command_nowait(par, AUOK190X_CMD_WAKEUP);
843
844 msleep(160);
845
846 /* wait for the controller to be ready and release the lock */
847 board->wait_for_rdy(par);
848 }
849
850 par->standby = 0;
851
852 mutex_unlock(&(par->io_lock));
853
854 return 0;
855 }
856
auok190x_suspend(struct device * dev)857 static int __maybe_unused auok190x_suspend(struct device *dev)
858 {
859 struct platform_device *pdev = to_platform_device(dev);
860 struct fb_info *info = platform_get_drvdata(pdev);
861 struct auok190xfb_par *par = info->par;
862 struct auok190x_board *board = par->board;
863 int ret;
864
865 dev_dbg(dev, "suspend\n");
866 if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
867 /* suspend via powering off the ic */
868 dev_dbg(dev, "suspend with broken standby\n");
869
870 auok190x_power(par, 0);
871 } else {
872 dev_dbg(dev, "suspend using sleep\n");
873
874 /* the sleep state can only be entered from the standby state.
875 * pm_runtime_get_noresume gets called before the suspend call.
876 * So the devices usage count is >0 but it is not necessarily
877 * active.
878 */
879 if (!pm_runtime_status_suspended(dev)) {
880 ret = auok190x_runtime_suspend(dev);
881 if (ret < 0) {
882 dev_err(dev, "auok190x_runtime_suspend failed with %d\n",
883 ret);
884 return ret;
885 }
886 par->manual_standby = 1;
887 }
888
889 gpio_direction_output(board->gpio_nsleep, 0);
890 }
891
892 msleep(100);
893
894 return 0;
895 }
896
auok190x_resume(struct device * dev)897 static int __maybe_unused auok190x_resume(struct device *dev)
898 {
899 struct platform_device *pdev = to_platform_device(dev);
900 struct fb_info *info = platform_get_drvdata(pdev);
901 struct auok190xfb_par *par = info->par;
902 struct auok190x_board *board = par->board;
903
904 dev_dbg(dev, "resume\n");
905 if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
906 dev_dbg(dev, "resume with broken standby\n");
907
908 auok190x_power(par, 1);
909
910 par->init(par);
911 } else {
912 dev_dbg(dev, "resume from sleep\n");
913
914 /* device should be in runtime suspend when we were suspended
915 * and pm_runtime_put_sync gets called after this function.
916 * So there is no need to touch the standby mode here at all.
917 */
918 gpio_direction_output(board->gpio_nsleep, 1);
919 msleep(100);
920
921 /* an additional init call seems to be necessary after sleep */
922 auok190x_runtime_resume(dev);
923 par->init(par);
924
925 /* if we were runtime-suspended before, suspend again*/
926 if (!par->manual_standby)
927 auok190x_runtime_suspend(dev);
928 else
929 par->manual_standby = 0;
930 }
931
932 return 0;
933 }
934
935 const struct dev_pm_ops auok190x_pm = {
936 SET_RUNTIME_PM_OPS(auok190x_runtime_suspend, auok190x_runtime_resume,
937 NULL)
938 SET_SYSTEM_SLEEP_PM_OPS(auok190x_suspend, auok190x_resume)
939 };
940 EXPORT_SYMBOL_GPL(auok190x_pm);
941
942 /*
943 * Common probe and remove code
944 */
945
auok190x_common_probe(struct platform_device * pdev,struct auok190x_init_data * init)946 int auok190x_common_probe(struct platform_device *pdev,
947 struct auok190x_init_data *init)
948 {
949 struct auok190x_board *board = init->board;
950 struct auok190xfb_par *par;
951 struct fb_info *info;
952 struct panel_info *panel;
953 int videomemorysize, ret;
954 unsigned char *videomemory;
955
956 /* check board contents */
957 if (!board->init || !board->cleanup || !board->wait_for_rdy
958 || !board->set_ctl || !board->set_hdb || !board->get_hdb
959 || !board->setup_irq)
960 return -EINVAL;
961
962 info = framebuffer_alloc(sizeof(struct auok190xfb_par), &pdev->dev);
963 if (!info)
964 return -ENOMEM;
965
966 par = info->par;
967 par->info = info;
968 par->board = board;
969 par->recover = auok190x_recover;
970 par->update_partial = init->update_partial;
971 par->update_all = init->update_all;
972 par->need_refresh = init->need_refresh;
973 par->init = init->init;
974
975 /* init update modes */
976 par->update_cnt = 0;
977 par->update_mode = -1;
978 par->last_mode = -1;
979 par->flash = 0;
980
981 par->regulator = regulator_get(info->device, "vdd");
982 if (IS_ERR(par->regulator)) {
983 ret = PTR_ERR(par->regulator);
984 dev_err(info->device, "Failed to get regulator: %d\n", ret);
985 goto err_reg;
986 }
987
988 ret = board->init(par);
989 if (ret) {
990 dev_err(info->device, "board init failed, %d\n", ret);
991 goto err_board;
992 }
993
994 ret = gpio_request(board->gpio_nsleep, "AUOK190x sleep");
995 if (ret) {
996 dev_err(info->device, "could not request sleep gpio, %d\n",
997 ret);
998 goto err_gpio1;
999 }
1000
1001 ret = gpio_direction_output(board->gpio_nsleep, 0);
1002 if (ret) {
1003 dev_err(info->device, "could not set sleep gpio, %d\n", ret);
1004 goto err_gpio2;
1005 }
1006
1007 ret = gpio_request(board->gpio_nrst, "AUOK190x reset");
1008 if (ret) {
1009 dev_err(info->device, "could not request reset gpio, %d\n",
1010 ret);
1011 goto err_gpio2;
1012 }
1013
1014 ret = gpio_direction_output(board->gpio_nrst, 0);
1015 if (ret) {
1016 dev_err(info->device, "could not set reset gpio, %d\n", ret);
1017 goto err_gpio3;
1018 }
1019
1020 ret = auok190x_power(par, 1);
1021 if (ret) {
1022 dev_err(info->device, "could not power on the device, %d\n",
1023 ret);
1024 goto err_gpio3;
1025 }
1026
1027 mutex_init(&par->io_lock);
1028
1029 init_waitqueue_head(&par->waitq);
1030
1031 ret = par->board->setup_irq(par->info);
1032 if (ret) {
1033 dev_err(info->device, "could not setup ready-irq, %d\n", ret);
1034 goto err_irq;
1035 }
1036
1037 /* wait for init to complete */
1038 par->board->wait_for_rdy(par);
1039
1040 /*
1041 * From here on the controller can talk to us
1042 */
1043
1044 /* initialise fix, var, resolution and rotation */
1045
1046 strlcpy(info->fix.id, init->id, 16);
1047 info->var.bits_per_pixel = 8;
1048 info->var.grayscale = 1;
1049
1050 panel = &panel_table[board->resolution];
1051
1052 par->resolution = board->resolution;
1053 par->rotation = 0;
1054
1055 /* videomemory handling */
1056
1057 videomemorysize = roundup((panel->w * panel->h) * 2, PAGE_SIZE);
1058 videomemory = vmalloc(videomemorysize);
1059 if (!videomemory) {
1060 ret = -ENOMEM;
1061 goto err_irq;
1062 }
1063
1064 memset(videomemory, 0, videomemorysize);
1065 info->screen_base = (char *)videomemory;
1066 info->fix.smem_len = videomemorysize;
1067
1068 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
1069 info->fbops = &auok190xfb_ops;
1070
1071 ret = auok190xfb_check_var(&info->var, info);
1072 if (ret)
1073 goto err_defio;
1074
1075 auok190xfb_set_fix(info);
1076
1077 /* deferred io init */
1078
1079 info->fbdefio = devm_kzalloc(info->device,
1080 sizeof(struct fb_deferred_io),
1081 GFP_KERNEL);
1082 if (!info->fbdefio) {
1083 dev_err(info->device, "Failed to allocate memory\n");
1084 ret = -ENOMEM;
1085 goto err_defio;
1086 }
1087
1088 dev_dbg(info->device, "targeting %d frames per second\n", board->fps);
1089 info->fbdefio->delay = HZ / board->fps;
1090 info->fbdefio->first_io = auok190xfb_dpy_first_io,
1091 info->fbdefio->deferred_io = auok190xfb_dpy_deferred_io,
1092 fb_deferred_io_init(info);
1093
1094 /* color map */
1095
1096 ret = fb_alloc_cmap(&info->cmap, 256, 0);
1097 if (ret < 0) {
1098 dev_err(info->device, "Failed to allocate colormap\n");
1099 goto err_cmap;
1100 }
1101
1102 /* controller init */
1103
1104 par->consecutive_threshold = 100;
1105 par->init(par);
1106 auok190x_identify(par);
1107
1108 platform_set_drvdata(pdev, info);
1109
1110 ret = register_framebuffer(info);
1111 if (ret < 0)
1112 goto err_regfb;
1113
1114 ret = sysfs_create_group(&info->device->kobj, &auok190x_attr_group);
1115 if (ret)
1116 goto err_sysfs;
1117
1118 dev_info(info->device, "fb%d: %dx%d using %dK of video memory\n",
1119 info->node, info->var.xres, info->var.yres,
1120 videomemorysize >> 10);
1121
1122 /* increase autosuspend_delay when we use alternative methods
1123 * for runtime_pm
1124 */
1125 par->autosuspend_delay = (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN)
1126 ? 1000 : 200;
1127
1128 pm_runtime_set_active(info->device);
1129 pm_runtime_enable(info->device);
1130 pm_runtime_set_autosuspend_delay(info->device, par->autosuspend_delay);
1131 pm_runtime_use_autosuspend(info->device);
1132
1133 return 0;
1134
1135 err_sysfs:
1136 unregister_framebuffer(info);
1137 err_regfb:
1138 fb_dealloc_cmap(&info->cmap);
1139 err_cmap:
1140 fb_deferred_io_cleanup(info);
1141 err_defio:
1142 vfree((void *)info->screen_base);
1143 err_irq:
1144 auok190x_power(par, 0);
1145 err_gpio3:
1146 gpio_free(board->gpio_nrst);
1147 err_gpio2:
1148 gpio_free(board->gpio_nsleep);
1149 err_gpio1:
1150 board->cleanup(par);
1151 err_board:
1152 regulator_put(par->regulator);
1153 err_reg:
1154 framebuffer_release(info);
1155
1156 return ret;
1157 }
1158 EXPORT_SYMBOL_GPL(auok190x_common_probe);
1159
auok190x_common_remove(struct platform_device * pdev)1160 int auok190x_common_remove(struct platform_device *pdev)
1161 {
1162 struct fb_info *info = platform_get_drvdata(pdev);
1163 struct auok190xfb_par *par = info->par;
1164 struct auok190x_board *board = par->board;
1165
1166 pm_runtime_disable(info->device);
1167
1168 sysfs_remove_group(&info->device->kobj, &auok190x_attr_group);
1169
1170 unregister_framebuffer(info);
1171
1172 fb_dealloc_cmap(&info->cmap);
1173
1174 fb_deferred_io_cleanup(info);
1175
1176 vfree((void *)info->screen_base);
1177
1178 auok190x_power(par, 0);
1179
1180 gpio_free(board->gpio_nrst);
1181 gpio_free(board->gpio_nsleep);
1182
1183 board->cleanup(par);
1184
1185 regulator_put(par->regulator);
1186
1187 framebuffer_release(info);
1188
1189 return 0;
1190 }
1191 EXPORT_SYMBOL_GPL(auok190x_common_remove);
1192
1193 MODULE_DESCRIPTION("Common code for AUO-K190X controllers");
1194 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
1195 MODULE_LICENSE("GPL");
1196