1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2013 Noralf Tronnes
4 *
5 * This driver is inspired by:
6 * st7735fb.c, Copyright (C) 2011, Matt Porter
7 * broadsheetfb.c, Copyright (C) 2008, Jaya Kumar
8 */
9
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/string.h>
14 #include <linux/mm.h>
15 #include <linux/vmalloc.h>
16 #include <linux/slab.h>
17 #include <linux/init.h>
18 #include <linux/fb.h>
19 #include <linux/gpio/consumer.h>
20 #include <linux/spi/spi.h>
21 #include <linux/delay.h>
22 #include <linux/uaccess.h>
23 #include <linux/backlight.h>
24 #include <linux/platform_device.h>
25 #include <linux/property.h>
26 #include <linux/spinlock.h>
27
28 #include <video/mipi_display.h>
29
30 #include "fbtft.h"
31 #include "internal.h"
32
33 static unsigned long debug;
34 module_param(debug, ulong, 0000);
35 MODULE_PARM_DESC(debug, "override device debug level");
36
fbtft_write_buf_dc(struct fbtft_par * par,void * buf,size_t len,int dc)37 int fbtft_write_buf_dc(struct fbtft_par *par, void *buf, size_t len, int dc)
38 {
39 int ret;
40
41 gpiod_set_value(par->gpio.dc, dc);
42
43 ret = par->fbtftops.write(par, buf, len);
44 if (ret < 0)
45 dev_err(par->info->device,
46 "write() failed and returned %d\n", ret);
47 return ret;
48 }
49 EXPORT_SYMBOL(fbtft_write_buf_dc);
50
fbtft_dbg_hex(const struct device * dev,int groupsize,const void * buf,size_t len,const char * fmt,...)51 void fbtft_dbg_hex(const struct device *dev, int groupsize,
52 const void *buf, size_t len, const char *fmt, ...)
53 {
54 va_list args;
55 static char textbuf[512];
56 char *text = textbuf;
57 size_t text_len;
58
59 va_start(args, fmt);
60 text_len = vscnprintf(text, sizeof(textbuf), fmt, args);
61 va_end(args);
62
63 hex_dump_to_buffer(buf, len, 32, groupsize, text + text_len,
64 512 - text_len, false);
65
66 if (len > 32)
67 dev_info(dev, "%s ...\n", text);
68 else
69 dev_info(dev, "%s\n", text);
70 }
71 EXPORT_SYMBOL(fbtft_dbg_hex);
72
fbtft_request_one_gpio(struct fbtft_par * par,const char * name,int index,struct gpio_desc ** gpiop)73 static int fbtft_request_one_gpio(struct fbtft_par *par,
74 const char *name, int index,
75 struct gpio_desc **gpiop)
76 {
77 struct device *dev = par->info->device;
78
79 *gpiop = devm_gpiod_get_index_optional(dev, name, index,
80 GPIOD_OUT_LOW);
81 if (IS_ERR(*gpiop))
82 return dev_err_probe(dev, PTR_ERR(*gpiop), "Failed to request %s GPIO\n", name);
83
84 fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' GPIO\n",
85 __func__, name);
86
87 return 0;
88 }
89
fbtft_request_gpios(struct fbtft_par * par)90 static int fbtft_request_gpios(struct fbtft_par *par)
91 {
92 int i;
93 int ret;
94
95 ret = fbtft_request_one_gpio(par, "reset", 0, &par->gpio.reset);
96 if (ret)
97 return ret;
98 ret = fbtft_request_one_gpio(par, "dc", 0, &par->gpio.dc);
99 if (ret)
100 return ret;
101 ret = fbtft_request_one_gpio(par, "rd", 0, &par->gpio.rd);
102 if (ret)
103 return ret;
104 ret = fbtft_request_one_gpio(par, "wr", 0, &par->gpio.wr);
105 if (ret)
106 return ret;
107 ret = fbtft_request_one_gpio(par, "cs", 0, &par->gpio.cs);
108 if (ret)
109 return ret;
110 ret = fbtft_request_one_gpio(par, "latch", 0, &par->gpio.latch);
111 if (ret)
112 return ret;
113 for (i = 0; i < 16; i++) {
114 ret = fbtft_request_one_gpio(par, "db", i,
115 &par->gpio.db[i]);
116 if (ret)
117 return ret;
118 ret = fbtft_request_one_gpio(par, "led", i,
119 &par->gpio.led[i]);
120 if (ret)
121 return ret;
122 ret = fbtft_request_one_gpio(par, "aux", i,
123 &par->gpio.aux[i]);
124 if (ret)
125 return ret;
126 }
127
128 return 0;
129 }
130
fbtft_backlight_update_status(struct backlight_device * bd)131 static int fbtft_backlight_update_status(struct backlight_device *bd)
132 {
133 struct fbtft_par *par = bl_get_data(bd);
134 bool polarity = par->polarity;
135
136 fbtft_par_dbg(DEBUG_BACKLIGHT, par,
137 "%s: polarity=%d, power=%d, fb_blank=%d\n",
138 __func__, polarity, bd->props.power, bd->props.fb_blank);
139
140 if (!backlight_is_blank(bd))
141 gpiod_set_value(par->gpio.led[0], polarity);
142 else
143 gpiod_set_value(par->gpio.led[0], !polarity);
144
145 return 0;
146 }
147
fbtft_backlight_get_brightness(struct backlight_device * bd)148 static int fbtft_backlight_get_brightness(struct backlight_device *bd)
149 {
150 return bd->props.brightness;
151 }
152
fbtft_unregister_backlight(struct fbtft_par * par)153 void fbtft_unregister_backlight(struct fbtft_par *par)
154 {
155 if (par->info->bl_dev) {
156 par->info->bl_dev->props.power = FB_BLANK_POWERDOWN;
157 backlight_update_status(par->info->bl_dev);
158 backlight_device_unregister(par->info->bl_dev);
159 par->info->bl_dev = NULL;
160 }
161 }
162 EXPORT_SYMBOL(fbtft_unregister_backlight);
163
164 static const struct backlight_ops fbtft_bl_ops = {
165 .get_brightness = fbtft_backlight_get_brightness,
166 .update_status = fbtft_backlight_update_status,
167 };
168
fbtft_register_backlight(struct fbtft_par * par)169 void fbtft_register_backlight(struct fbtft_par *par)
170 {
171 struct backlight_device *bd;
172 struct backlight_properties bl_props = { 0, };
173
174 if (!par->gpio.led[0]) {
175 fbtft_par_dbg(DEBUG_BACKLIGHT, par,
176 "%s(): led pin not set, exiting.\n", __func__);
177 return;
178 }
179
180 bl_props.type = BACKLIGHT_RAW;
181 /* Assume backlight is off, get polarity from current state of pin */
182 bl_props.power = FB_BLANK_POWERDOWN;
183 if (!gpiod_get_value(par->gpio.led[0]))
184 par->polarity = true;
185
186 bd = backlight_device_register(dev_driver_string(par->info->device),
187 par->info->device, par,
188 &fbtft_bl_ops, &bl_props);
189 if (IS_ERR(bd)) {
190 dev_err(par->info->device,
191 "cannot register backlight device (%ld)\n",
192 PTR_ERR(bd));
193 return;
194 }
195 par->info->bl_dev = bd;
196
197 if (!par->fbtftops.unregister_backlight)
198 par->fbtftops.unregister_backlight = fbtft_unregister_backlight;
199 }
200 EXPORT_SYMBOL(fbtft_register_backlight);
201
fbtft_set_addr_win(struct fbtft_par * par,int xs,int ys,int xe,int ye)202 static void fbtft_set_addr_win(struct fbtft_par *par, int xs, int ys, int xe,
203 int ye)
204 {
205 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
206 (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
207
208 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
209 (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
210
211 write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
212 }
213
fbtft_reset(struct fbtft_par * par)214 static void fbtft_reset(struct fbtft_par *par)
215 {
216 if (!par->gpio.reset)
217 return;
218
219 fbtft_par_dbg(DEBUG_RESET, par, "%s()\n", __func__);
220
221 gpiod_set_value_cansleep(par->gpio.reset, 1);
222 usleep_range(20, 40);
223 gpiod_set_value_cansleep(par->gpio.reset, 0);
224 msleep(120);
225
226 gpiod_set_value_cansleep(par->gpio.cs, 1); /* Activate chip */
227 }
228
fbtft_update_display(struct fbtft_par * par,unsigned int start_line,unsigned int end_line)229 static void fbtft_update_display(struct fbtft_par *par, unsigned int start_line,
230 unsigned int end_line)
231 {
232 size_t offset, len;
233 ktime_t ts_start, ts_end;
234 long fps, throughput;
235 bool timeit = false;
236 int ret = 0;
237
238 if (unlikely(par->debug & (DEBUG_TIME_FIRST_UPDATE |
239 DEBUG_TIME_EACH_UPDATE))) {
240 if ((par->debug & DEBUG_TIME_EACH_UPDATE) ||
241 ((par->debug & DEBUG_TIME_FIRST_UPDATE) &&
242 !par->first_update_done)) {
243 ts_start = ktime_get();
244 timeit = true;
245 }
246 }
247
248 /* Sanity checks */
249 if (start_line > end_line) {
250 dev_warn(par->info->device,
251 "%s: start_line=%u is larger than end_line=%u. Shouldn't happen, will do full display update\n",
252 __func__, start_line, end_line);
253 start_line = 0;
254 end_line = par->info->var.yres - 1;
255 }
256 if (start_line > par->info->var.yres - 1 ||
257 end_line > par->info->var.yres - 1) {
258 dev_warn(par->info->device,
259 "%s: start_line=%u or end_line=%u is larger than max=%d. Shouldn't happen, will do full display update\n",
260 __func__, start_line,
261 end_line, par->info->var.yres - 1);
262 start_line = 0;
263 end_line = par->info->var.yres - 1;
264 }
265
266 fbtft_par_dbg(DEBUG_UPDATE_DISPLAY, par, "%s(start_line=%u, end_line=%u)\n",
267 __func__, start_line, end_line);
268
269 if (par->fbtftops.set_addr_win)
270 par->fbtftops.set_addr_win(par, 0, start_line,
271 par->info->var.xres - 1, end_line);
272
273 offset = start_line * par->info->fix.line_length;
274 len = (end_line - start_line + 1) * par->info->fix.line_length;
275 ret = par->fbtftops.write_vmem(par, offset, len);
276 if (ret < 0)
277 dev_err(par->info->device,
278 "%s: write_vmem failed to update display buffer\n",
279 __func__);
280
281 if (unlikely(timeit)) {
282 ts_end = ktime_get();
283 if (!ktime_to_ns(par->update_time))
284 par->update_time = ts_start;
285
286 fps = ktime_us_delta(ts_start, par->update_time);
287 par->update_time = ts_start;
288 fps = fps ? 1000000 / fps : 0;
289
290 throughput = ktime_us_delta(ts_end, ts_start);
291 throughput = throughput ? (len * 1000) / throughput : 0;
292 throughput = throughput * 1000 / 1024;
293
294 dev_info(par->info->device,
295 "Display update: %ld kB/s, fps=%ld\n",
296 throughput, fps);
297 par->first_update_done = true;
298 }
299 }
300
fbtft_mkdirty(struct fb_info * info,int y,int height)301 static void fbtft_mkdirty(struct fb_info *info, int y, int height)
302 {
303 struct fbtft_par *par = info->par;
304 struct fb_deferred_io *fbdefio = info->fbdefio;
305
306 /* special case, needed ? */
307 if (y == -1) {
308 y = 0;
309 height = info->var.yres;
310 }
311
312 /* Mark display lines/area as dirty */
313 spin_lock(&par->dirty_lock);
314 if (y < par->dirty_lines_start)
315 par->dirty_lines_start = y;
316 if (y + height - 1 > par->dirty_lines_end)
317 par->dirty_lines_end = y + height - 1;
318 spin_unlock(&par->dirty_lock);
319
320 /* Schedule deferred_io to update display (no-op if already on queue)*/
321 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
322 }
323
fbtft_deferred_io(struct fb_info * info,struct list_head * pagereflist)324 static void fbtft_deferred_io(struct fb_info *info, struct list_head *pagereflist)
325 {
326 struct fbtft_par *par = info->par;
327 unsigned int dirty_lines_start, dirty_lines_end;
328 struct fb_deferred_io_pageref *pageref;
329 unsigned int y_low = 0, y_high = 0;
330 int count = 0;
331
332 spin_lock(&par->dirty_lock);
333 dirty_lines_start = par->dirty_lines_start;
334 dirty_lines_end = par->dirty_lines_end;
335 /* set display line markers as clean */
336 par->dirty_lines_start = par->info->var.yres - 1;
337 par->dirty_lines_end = 0;
338 spin_unlock(&par->dirty_lock);
339
340 /* Mark display lines as dirty */
341 list_for_each_entry(pageref, pagereflist, list) {
342 count++;
343 y_low = pageref->offset / info->fix.line_length;
344 y_high = (pageref->offset + PAGE_SIZE - 1) / info->fix.line_length;
345 dev_dbg(info->device,
346 "page->index=%lu y_low=%d y_high=%d\n",
347 pageref->page->index, y_low, y_high);
348 if (y_high > info->var.yres - 1)
349 y_high = info->var.yres - 1;
350 if (y_low < dirty_lines_start)
351 dirty_lines_start = y_low;
352 if (y_high > dirty_lines_end)
353 dirty_lines_end = y_high;
354 }
355
356 par->fbtftops.update_display(info->par,
357 dirty_lines_start, dirty_lines_end);
358 }
359
fbtft_fb_fillrect(struct fb_info * info,const struct fb_fillrect * rect)360 static void fbtft_fb_fillrect(struct fb_info *info,
361 const struct fb_fillrect *rect)
362 {
363 struct fbtft_par *par = info->par;
364
365 dev_dbg(info->dev,
366 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
367 __func__, rect->dx, rect->dy, rect->width, rect->height);
368 sys_fillrect(info, rect);
369
370 par->fbtftops.mkdirty(info, rect->dy, rect->height);
371 }
372
fbtft_fb_copyarea(struct fb_info * info,const struct fb_copyarea * area)373 static void fbtft_fb_copyarea(struct fb_info *info,
374 const struct fb_copyarea *area)
375 {
376 struct fbtft_par *par = info->par;
377
378 dev_dbg(info->dev,
379 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
380 __func__, area->dx, area->dy, area->width, area->height);
381 sys_copyarea(info, area);
382
383 par->fbtftops.mkdirty(info, area->dy, area->height);
384 }
385
fbtft_fb_imageblit(struct fb_info * info,const struct fb_image * image)386 static void fbtft_fb_imageblit(struct fb_info *info,
387 const struct fb_image *image)
388 {
389 struct fbtft_par *par = info->par;
390
391 dev_dbg(info->dev,
392 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
393 __func__, image->dx, image->dy, image->width, image->height);
394 sys_imageblit(info, image);
395
396 par->fbtftops.mkdirty(info, image->dy, image->height);
397 }
398
fbtft_fb_write(struct fb_info * info,const char __user * buf,size_t count,loff_t * ppos)399 static ssize_t fbtft_fb_write(struct fb_info *info, const char __user *buf,
400 size_t count, loff_t *ppos)
401 {
402 struct fbtft_par *par = info->par;
403 ssize_t res;
404
405 dev_dbg(info->dev,
406 "%s: count=%zd, ppos=%llu\n", __func__, count, *ppos);
407 res = fb_sys_write(info, buf, count, ppos);
408
409 /* TODO: only mark changed area update all for now */
410 par->fbtftops.mkdirty(info, -1, 0);
411
412 return res;
413 }
414
415 /* from pxafb.c */
chan_to_field(unsigned int chan,struct fb_bitfield * bf)416 static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
417 {
418 chan &= 0xffff;
419 chan >>= 16 - bf->length;
420 return chan << bf->offset;
421 }
422
fbtft_fb_setcolreg(unsigned int regno,unsigned int red,unsigned int green,unsigned int blue,unsigned int transp,struct fb_info * info)423 static int fbtft_fb_setcolreg(unsigned int regno, unsigned int red,
424 unsigned int green, unsigned int blue,
425 unsigned int transp, struct fb_info *info)
426 {
427 unsigned int val;
428 int ret = 1;
429
430 dev_dbg(info->dev,
431 "%s(regno=%u, red=0x%X, green=0x%X, blue=0x%X, trans=0x%X)\n",
432 __func__, regno, red, green, blue, transp);
433
434 switch (info->fix.visual) {
435 case FB_VISUAL_TRUECOLOR:
436 if (regno < 16) {
437 u32 *pal = info->pseudo_palette;
438
439 val = chan_to_field(red, &info->var.red);
440 val |= chan_to_field(green, &info->var.green);
441 val |= chan_to_field(blue, &info->var.blue);
442
443 pal[regno] = val;
444 ret = 0;
445 }
446 break;
447 }
448 return ret;
449 }
450
fbtft_fb_blank(int blank,struct fb_info * info)451 static int fbtft_fb_blank(int blank, struct fb_info *info)
452 {
453 struct fbtft_par *par = info->par;
454 int ret = -EINVAL;
455
456 dev_dbg(info->dev, "%s(blank=%d)\n",
457 __func__, blank);
458
459 if (!par->fbtftops.blank)
460 return ret;
461
462 switch (blank) {
463 case FB_BLANK_POWERDOWN:
464 case FB_BLANK_VSYNC_SUSPEND:
465 case FB_BLANK_HSYNC_SUSPEND:
466 case FB_BLANK_NORMAL:
467 ret = par->fbtftops.blank(par, true);
468 break;
469 case FB_BLANK_UNBLANK:
470 ret = par->fbtftops.blank(par, false);
471 break;
472 }
473 return ret;
474 }
475
fbtft_merge_fbtftops(struct fbtft_ops * dst,struct fbtft_ops * src)476 static void fbtft_merge_fbtftops(struct fbtft_ops *dst, struct fbtft_ops *src)
477 {
478 if (src->write)
479 dst->write = src->write;
480 if (src->read)
481 dst->read = src->read;
482 if (src->write_vmem)
483 dst->write_vmem = src->write_vmem;
484 if (src->write_register)
485 dst->write_register = src->write_register;
486 if (src->set_addr_win)
487 dst->set_addr_win = src->set_addr_win;
488 if (src->reset)
489 dst->reset = src->reset;
490 if (src->mkdirty)
491 dst->mkdirty = src->mkdirty;
492 if (src->update_display)
493 dst->update_display = src->update_display;
494 if (src->init_display)
495 dst->init_display = src->init_display;
496 if (src->blank)
497 dst->blank = src->blank;
498 if (src->request_gpios_match)
499 dst->request_gpios_match = src->request_gpios_match;
500 if (src->request_gpios)
501 dst->request_gpios = src->request_gpios;
502 if (src->verify_gpios)
503 dst->verify_gpios = src->verify_gpios;
504 if (src->register_backlight)
505 dst->register_backlight = src->register_backlight;
506 if (src->unregister_backlight)
507 dst->unregister_backlight = src->unregister_backlight;
508 if (src->set_var)
509 dst->set_var = src->set_var;
510 if (src->set_gamma)
511 dst->set_gamma = src->set_gamma;
512 }
513
514 /**
515 * fbtft_framebuffer_alloc - creates a new frame buffer info structure
516 *
517 * @display: pointer to structure describing the display
518 * @dev: pointer to the device for this fb, this can be NULL
519 * @pdata: platform data for the display in use
520 *
521 * Creates a new frame buffer info structure.
522 *
523 * Also creates and populates the following structures:
524 * info->fbops
525 * info->fbdefio
526 * info->pseudo_palette
527 * par->fbtftops
528 * par->txbuf
529 *
530 * Returns the new structure, or NULL if an error occurred.
531 *
532 */
fbtft_framebuffer_alloc(struct fbtft_display * display,struct device * dev,struct fbtft_platform_data * pdata)533 struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
534 struct device *dev,
535 struct fbtft_platform_data *pdata)
536 {
537 struct fb_info *info;
538 struct fbtft_par *par;
539 struct fb_ops *fbops = NULL;
540 struct fb_deferred_io *fbdefio = NULL;
541 u8 *vmem = NULL;
542 void *txbuf = NULL;
543 void *buf = NULL;
544 unsigned int width;
545 unsigned int height;
546 int txbuflen = display->txbuflen;
547 unsigned int bpp = display->bpp;
548 unsigned int fps = display->fps;
549 int vmem_size;
550 const s16 *init_sequence = display->init_sequence;
551 char *gamma = display->gamma;
552 u32 *gamma_curves = NULL;
553
554 /* sanity check */
555 if (display->gamma_num * display->gamma_len >
556 FBTFT_GAMMA_MAX_VALUES_TOTAL) {
557 dev_err(dev, "FBTFT_GAMMA_MAX_VALUES_TOTAL=%d is exceeded\n",
558 FBTFT_GAMMA_MAX_VALUES_TOTAL);
559 return NULL;
560 }
561
562 /* defaults */
563 if (!fps)
564 fps = 20;
565 if (!bpp)
566 bpp = 16;
567
568 if (!pdata) {
569 dev_err(dev, "platform data is missing\n");
570 return NULL;
571 }
572
573 /* override driver values? */
574 if (pdata->fps)
575 fps = pdata->fps;
576 if (pdata->txbuflen)
577 txbuflen = pdata->txbuflen;
578 if (pdata->display.init_sequence)
579 init_sequence = pdata->display.init_sequence;
580 if (pdata->gamma)
581 gamma = pdata->gamma;
582 if (pdata->display.debug)
583 display->debug = pdata->display.debug;
584 if (pdata->display.backlight)
585 display->backlight = pdata->display.backlight;
586 if (pdata->display.width)
587 display->width = pdata->display.width;
588 if (pdata->display.height)
589 display->height = pdata->display.height;
590 if (pdata->display.buswidth)
591 display->buswidth = pdata->display.buswidth;
592 if (pdata->display.regwidth)
593 display->regwidth = pdata->display.regwidth;
594
595 display->debug |= debug;
596 fbtft_expand_debug_value(&display->debug);
597
598 switch (pdata->rotate) {
599 case 90:
600 case 270:
601 width = display->height;
602 height = display->width;
603 break;
604 default:
605 width = display->width;
606 height = display->height;
607 }
608
609 vmem_size = display->width * display->height * bpp / 8;
610 vmem = vzalloc(vmem_size);
611 if (!vmem)
612 goto alloc_fail;
613
614 fbops = devm_kzalloc(dev, sizeof(struct fb_ops), GFP_KERNEL);
615 if (!fbops)
616 goto alloc_fail;
617
618 fbdefio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL);
619 if (!fbdefio)
620 goto alloc_fail;
621
622 buf = devm_kzalloc(dev, 128, GFP_KERNEL);
623 if (!buf)
624 goto alloc_fail;
625
626 if (display->gamma_num && display->gamma_len) {
627 gamma_curves = devm_kcalloc(dev,
628 display->gamma_num *
629 display->gamma_len,
630 sizeof(gamma_curves[0]),
631 GFP_KERNEL);
632 if (!gamma_curves)
633 goto alloc_fail;
634 }
635
636 info = framebuffer_alloc(sizeof(struct fbtft_par), dev);
637 if (!info)
638 goto alloc_fail;
639
640 info->screen_buffer = vmem;
641 info->fbops = fbops;
642 info->fbdefio = fbdefio;
643
644 fbops->owner = dev->driver->owner;
645 fbops->fb_read = fb_sys_read;
646 fbops->fb_write = fbtft_fb_write;
647 fbops->fb_fillrect = fbtft_fb_fillrect;
648 fbops->fb_copyarea = fbtft_fb_copyarea;
649 fbops->fb_imageblit = fbtft_fb_imageblit;
650 fbops->fb_setcolreg = fbtft_fb_setcolreg;
651 fbops->fb_blank = fbtft_fb_blank;
652 fbops->fb_mmap = fb_deferred_io_mmap;
653
654 fbdefio->delay = HZ / fps;
655 fbdefio->sort_pagereflist = true;
656 fbdefio->deferred_io = fbtft_deferred_io;
657
658 snprintf(info->fix.id, sizeof(info->fix.id), "%s", dev->driver->name);
659 info->fix.type = FB_TYPE_PACKED_PIXELS;
660 info->fix.visual = FB_VISUAL_TRUECOLOR;
661 info->fix.xpanstep = 0;
662 info->fix.ypanstep = 0;
663 info->fix.ywrapstep = 0;
664 info->fix.line_length = width * bpp / 8;
665 info->fix.accel = FB_ACCEL_NONE;
666 info->fix.smem_len = vmem_size;
667 fb_deferred_io_init(info);
668
669 info->var.rotate = pdata->rotate;
670 info->var.xres = width;
671 info->var.yres = height;
672 info->var.xres_virtual = info->var.xres;
673 info->var.yres_virtual = info->var.yres;
674 info->var.bits_per_pixel = bpp;
675 info->var.nonstd = 1;
676
677 /* RGB565 */
678 info->var.red.offset = 11;
679 info->var.red.length = 5;
680 info->var.green.offset = 5;
681 info->var.green.length = 6;
682 info->var.blue.offset = 0;
683 info->var.blue.length = 5;
684 info->var.transp.offset = 0;
685 info->var.transp.length = 0;
686
687 info->flags = FBINFO_VIRTFB;
688
689 par = info->par;
690 par->info = info;
691 par->pdata = pdata;
692 par->debug = display->debug;
693 par->buf = buf;
694 spin_lock_init(&par->dirty_lock);
695 par->bgr = pdata->bgr;
696 par->startbyte = pdata->startbyte;
697 par->init_sequence = init_sequence;
698 par->gamma.curves = gamma_curves;
699 par->gamma.num_curves = display->gamma_num;
700 par->gamma.num_values = display->gamma_len;
701 mutex_init(&par->gamma.lock);
702 info->pseudo_palette = par->pseudo_palette;
703
704 if (par->gamma.curves && gamma) {
705 if (fbtft_gamma_parse_str(par, par->gamma.curves, gamma,
706 strlen(gamma)))
707 goto release_framebuf;
708 }
709
710 /* Transmit buffer */
711 if (txbuflen == -1)
712 txbuflen = vmem_size + 2; /* add in case startbyte is used */
713 if (txbuflen >= vmem_size + 2)
714 txbuflen = 0;
715
716 #ifdef __LITTLE_ENDIAN
717 if ((!txbuflen) && (bpp > 8))
718 txbuflen = PAGE_SIZE; /* need buffer for byteswapping */
719 #endif
720
721 if (txbuflen > 0) {
722 txbuf = devm_kzalloc(par->info->device, txbuflen, GFP_KERNEL);
723 if (!txbuf)
724 goto release_framebuf;
725 par->txbuf.buf = txbuf;
726 par->txbuf.len = txbuflen;
727 }
728
729 /* default fbtft operations */
730 par->fbtftops.write = fbtft_write_spi;
731 par->fbtftops.read = fbtft_read_spi;
732 par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
733 par->fbtftops.write_register = fbtft_write_reg8_bus8;
734 par->fbtftops.set_addr_win = fbtft_set_addr_win;
735 par->fbtftops.reset = fbtft_reset;
736 par->fbtftops.mkdirty = fbtft_mkdirty;
737 par->fbtftops.update_display = fbtft_update_display;
738 if (display->backlight)
739 par->fbtftops.register_backlight = fbtft_register_backlight;
740
741 /* use driver provided functions */
742 fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
743
744 return info;
745
746 release_framebuf:
747 framebuffer_release(info);
748
749 alloc_fail:
750 vfree(vmem);
751
752 return NULL;
753 }
754 EXPORT_SYMBOL(fbtft_framebuffer_alloc);
755
756 /**
757 * fbtft_framebuffer_release - frees up all memory used by the framebuffer
758 *
759 * @info: frame buffer info structure
760 *
761 */
fbtft_framebuffer_release(struct fb_info * info)762 void fbtft_framebuffer_release(struct fb_info *info)
763 {
764 fb_deferred_io_cleanup(info);
765 vfree(info->screen_buffer);
766 framebuffer_release(info);
767 }
768 EXPORT_SYMBOL(fbtft_framebuffer_release);
769
770 /**
771 * fbtft_register_framebuffer - registers a tft frame buffer device
772 * @fb_info: frame buffer info structure
773 *
774 * Sets SPI driverdata if needed
775 * Requests needed gpios.
776 * Initializes display
777 * Updates display.
778 * Registers a frame buffer device @fb_info.
779 *
780 * Returns negative errno on error, or zero for success.
781 *
782 */
fbtft_register_framebuffer(struct fb_info * fb_info)783 int fbtft_register_framebuffer(struct fb_info *fb_info)
784 {
785 int ret;
786 char text1[50] = "";
787 char text2[50] = "";
788 struct fbtft_par *par = fb_info->par;
789 struct spi_device *spi = par->spi;
790
791 /* sanity checks */
792 if (!par->fbtftops.init_display) {
793 dev_err(fb_info->device, "missing fbtftops.init_display()\n");
794 return -EINVAL;
795 }
796
797 if (spi)
798 spi_set_drvdata(spi, fb_info);
799 if (par->pdev)
800 platform_set_drvdata(par->pdev, fb_info);
801
802 ret = par->fbtftops.request_gpios(par);
803 if (ret < 0)
804 goto reg_fail;
805
806 if (par->fbtftops.verify_gpios) {
807 ret = par->fbtftops.verify_gpios(par);
808 if (ret < 0)
809 goto reg_fail;
810 }
811
812 ret = par->fbtftops.init_display(par);
813 if (ret < 0)
814 goto reg_fail;
815 if (par->fbtftops.set_var) {
816 ret = par->fbtftops.set_var(par);
817 if (ret < 0)
818 goto reg_fail;
819 }
820
821 /* update the entire display */
822 par->fbtftops.update_display(par, 0, par->info->var.yres - 1);
823
824 if (par->fbtftops.set_gamma && par->gamma.curves) {
825 ret = par->fbtftops.set_gamma(par, par->gamma.curves);
826 if (ret)
827 goto reg_fail;
828 }
829
830 if (par->fbtftops.register_backlight)
831 par->fbtftops.register_backlight(par);
832
833 ret = register_framebuffer(fb_info);
834 if (ret < 0)
835 goto reg_fail;
836
837 fbtft_sysfs_init(par);
838
839 if (par->txbuf.buf && par->txbuf.len >= 1024)
840 sprintf(text1, ", %zu KiB buffer memory", par->txbuf.len >> 10);
841 if (spi)
842 sprintf(text2, ", spi%d.%d at %d MHz", spi->master->bus_num,
843 spi_get_chipselect(spi, 0), spi->max_speed_hz / 1000000);
844 dev_info(fb_info->dev,
845 "%s frame buffer, %dx%d, %d KiB video memory%s, fps=%lu%s\n",
846 fb_info->fix.id, fb_info->var.xres, fb_info->var.yres,
847 fb_info->fix.smem_len >> 10, text1,
848 HZ / fb_info->fbdefio->delay, text2);
849
850 /* Turn on backlight if available */
851 if (fb_info->bl_dev) {
852 fb_info->bl_dev->props.power = FB_BLANK_UNBLANK;
853 fb_info->bl_dev->ops->update_status(fb_info->bl_dev);
854 }
855
856 return 0;
857
858 reg_fail:
859 if (par->fbtftops.unregister_backlight)
860 par->fbtftops.unregister_backlight(par);
861
862 return ret;
863 }
864 EXPORT_SYMBOL(fbtft_register_framebuffer);
865
866 /**
867 * fbtft_unregister_framebuffer - releases a tft frame buffer device
868 * @fb_info: frame buffer info structure
869 *
870 * Frees SPI driverdata if needed
871 * Frees gpios.
872 * Unregisters frame buffer device.
873 *
874 */
fbtft_unregister_framebuffer(struct fb_info * fb_info)875 int fbtft_unregister_framebuffer(struct fb_info *fb_info)
876 {
877 struct fbtft_par *par = fb_info->par;
878
879 if (par->fbtftops.unregister_backlight)
880 par->fbtftops.unregister_backlight(par);
881 fbtft_sysfs_exit(par);
882 unregister_framebuffer(fb_info);
883
884 return 0;
885 }
886 EXPORT_SYMBOL(fbtft_unregister_framebuffer);
887
888 /**
889 * fbtft_init_display_from_property() - Device Tree init_display() function
890 * @par: Driver data
891 *
892 * Return: 0 if successful, negative if error
893 */
fbtft_init_display_from_property(struct fbtft_par * par)894 static int fbtft_init_display_from_property(struct fbtft_par *par)
895 {
896 struct device *dev = par->info->device;
897 int buf[64], count, index, i, j, ret;
898 u32 *values;
899 u32 val;
900
901 count = device_property_count_u32(dev, "init");
902 if (count < 0)
903 return count;
904 if (count == 0)
905 return -EINVAL;
906
907 values = kmalloc_array(count + 1, sizeof(*values), GFP_KERNEL);
908 if (!values)
909 return -ENOMEM;
910
911 ret = device_property_read_u32_array(dev, "init", values, count);
912 if (ret)
913 goto out_free;
914
915 par->fbtftops.reset(par);
916
917 index = -1;
918 val = values[++index];
919
920 while (index < count) {
921 if (val & FBTFT_OF_INIT_CMD) {
922 val &= 0xFFFF;
923 i = 0;
924 while ((index < count) && !(val & 0xFFFF0000)) {
925 if (i > 63) {
926 dev_err(dev,
927 "%s: Maximum register values exceeded\n",
928 __func__);
929 ret = -EINVAL;
930 goto out_free;
931 }
932 buf[i++] = val;
933 val = values[++index];
934 }
935 /* make debug message */
936 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
937 "init: write_register:\n");
938 for (j = 0; j < i; j++)
939 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
940 "buf[%d] = %02X\n", j, buf[j]);
941
942 par->fbtftops.write_register(par, i,
943 buf[0], buf[1], buf[2], buf[3],
944 buf[4], buf[5], buf[6], buf[7],
945 buf[8], buf[9], buf[10], buf[11],
946 buf[12], buf[13], buf[14], buf[15],
947 buf[16], buf[17], buf[18], buf[19],
948 buf[20], buf[21], buf[22], buf[23],
949 buf[24], buf[25], buf[26], buf[27],
950 buf[28], buf[29], buf[30], buf[31],
951 buf[32], buf[33], buf[34], buf[35],
952 buf[36], buf[37], buf[38], buf[39],
953 buf[40], buf[41], buf[42], buf[43],
954 buf[44], buf[45], buf[46], buf[47],
955 buf[48], buf[49], buf[50], buf[51],
956 buf[52], buf[53], buf[54], buf[55],
957 buf[56], buf[57], buf[58], buf[59],
958 buf[60], buf[61], buf[62], buf[63]);
959 } else if (val & FBTFT_OF_INIT_DELAY) {
960 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
961 "init: msleep(%u)\n", val & 0xFFFF);
962 msleep(val & 0xFFFF);
963 val = values[++index];
964 } else {
965 dev_err(dev, "illegal init value 0x%X\n", val);
966 ret = -EINVAL;
967 goto out_free;
968 }
969 }
970
971 out_free:
972 kfree(values);
973 return ret;
974 }
975
976 /**
977 * fbtft_init_display() - Generic init_display() function
978 * @par: Driver data
979 *
980 * Uses par->init_sequence to do the initialization
981 *
982 * Return: 0 if successful, negative if error
983 */
fbtft_init_display(struct fbtft_par * par)984 int fbtft_init_display(struct fbtft_par *par)
985 {
986 int buf[64];
987 int i;
988 int j;
989
990 /* sanity check */
991 if (!par->init_sequence) {
992 dev_err(par->info->device,
993 "error: init_sequence is not set\n");
994 return -EINVAL;
995 }
996
997 /* make sure stop marker exists */
998 for (i = 0; i < FBTFT_MAX_INIT_SEQUENCE; i++) {
999 if (par->init_sequence[i] == -3)
1000 break;
1001 }
1002
1003 if (i == FBTFT_MAX_INIT_SEQUENCE) {
1004 dev_err(par->info->device,
1005 "missing stop marker at end of init sequence\n");
1006 return -EINVAL;
1007 }
1008
1009 par->fbtftops.reset(par);
1010
1011 i = 0;
1012 while (i < FBTFT_MAX_INIT_SEQUENCE) {
1013 if (par->init_sequence[i] == -3) {
1014 /* done */
1015 return 0;
1016 }
1017 if (par->init_sequence[i] >= 0) {
1018 dev_err(par->info->device,
1019 "missing delimiter at position %d\n", i);
1020 return -EINVAL;
1021 }
1022 if (par->init_sequence[i + 1] < 0) {
1023 dev_err(par->info->device,
1024 "missing value after delimiter %d at position %d\n",
1025 par->init_sequence[i], i);
1026 return -EINVAL;
1027 }
1028 switch (par->init_sequence[i]) {
1029 case -1:
1030 i++;
1031
1032 /* make debug message */
1033 for (j = 0; par->init_sequence[i + 1 + j] >= 0; j++)
1034 ;
1035
1036 fbtft_par_dbg_hex(DEBUG_INIT_DISPLAY, par, par->info->device,
1037 s16, &par->init_sequence[i + 1], j,
1038 "init: write(0x%02X)", par->init_sequence[i]);
1039
1040 /* Write */
1041 j = 0;
1042 while (par->init_sequence[i] >= 0) {
1043 if (j > 63) {
1044 dev_err(par->info->device,
1045 "%s: Maximum register values exceeded\n",
1046 __func__);
1047 return -EINVAL;
1048 }
1049 buf[j++] = par->init_sequence[i++];
1050 }
1051 par->fbtftops.write_register(par, j,
1052 buf[0], buf[1], buf[2], buf[3],
1053 buf[4], buf[5], buf[6], buf[7],
1054 buf[8], buf[9], buf[10], buf[11],
1055 buf[12], buf[13], buf[14], buf[15],
1056 buf[16], buf[17], buf[18], buf[19],
1057 buf[20], buf[21], buf[22], buf[23],
1058 buf[24], buf[25], buf[26], buf[27],
1059 buf[28], buf[29], buf[30], buf[31],
1060 buf[32], buf[33], buf[34], buf[35],
1061 buf[36], buf[37], buf[38], buf[39],
1062 buf[40], buf[41], buf[42], buf[43],
1063 buf[44], buf[45], buf[46], buf[47],
1064 buf[48], buf[49], buf[50], buf[51],
1065 buf[52], buf[53], buf[54], buf[55],
1066 buf[56], buf[57], buf[58], buf[59],
1067 buf[60], buf[61], buf[62], buf[63]);
1068 break;
1069 case -2:
1070 i++;
1071 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
1072 "init: mdelay(%d)\n",
1073 par->init_sequence[i]);
1074 mdelay(par->init_sequence[i++]);
1075 break;
1076 default:
1077 dev_err(par->info->device,
1078 "unknown delimiter %d at position %d\n",
1079 par->init_sequence[i], i);
1080 return -EINVAL;
1081 }
1082 }
1083
1084 dev_err(par->info->device,
1085 "%s: something is wrong. Shouldn't get here.\n", __func__);
1086 return -EINVAL;
1087 }
1088 EXPORT_SYMBOL(fbtft_init_display);
1089
1090 /**
1091 * fbtft_verify_gpios() - Generic verify_gpios() function
1092 * @par: Driver data
1093 *
1094 * Uses @spi, @pdev and @buswidth to determine which GPIOs is needed
1095 *
1096 * Return: 0 if successful, negative if error
1097 */
fbtft_verify_gpios(struct fbtft_par * par)1098 static int fbtft_verify_gpios(struct fbtft_par *par)
1099 {
1100 struct fbtft_platform_data *pdata = par->pdata;
1101 int i;
1102
1103 fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);
1104
1105 if (pdata->display.buswidth != 9 && par->startbyte == 0 &&
1106 !par->gpio.dc) {
1107 dev_err(par->info->device,
1108 "Missing info about 'dc' gpio. Aborting.\n");
1109 return -EINVAL;
1110 }
1111
1112 if (!par->pdev)
1113 return 0;
1114
1115 if (!par->gpio.wr) {
1116 dev_err(par->info->device, "Missing 'wr' gpio. Aborting.\n");
1117 return -EINVAL;
1118 }
1119 for (i = 0; i < pdata->display.buswidth; i++) {
1120 if (!par->gpio.db[i]) {
1121 dev_err(par->info->device,
1122 "Missing 'db%02d' gpio. Aborting.\n", i);
1123 return -EINVAL;
1124 }
1125 }
1126
1127 return 0;
1128 }
1129
1130 /* returns 0 if the property is not present */
fbtft_property_value(struct device * dev,const char * propname)1131 static u32 fbtft_property_value(struct device *dev, const char *propname)
1132 {
1133 int ret;
1134 u32 val = 0;
1135
1136 ret = device_property_read_u32(dev, propname, &val);
1137 if (ret == 0)
1138 dev_info(dev, "%s: %s = %u\n", __func__, propname, val);
1139
1140 return val;
1141 }
1142
fbtft_properties_read(struct device * dev)1143 static struct fbtft_platform_data *fbtft_properties_read(struct device *dev)
1144 {
1145 struct fbtft_platform_data *pdata;
1146
1147 if (!dev_fwnode(dev)) {
1148 dev_err(dev, "Missing platform data or properties\n");
1149 return ERR_PTR(-EINVAL);
1150 }
1151
1152 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1153 if (!pdata)
1154 return ERR_PTR(-ENOMEM);
1155
1156 pdata->display.width = fbtft_property_value(dev, "width");
1157 pdata->display.height = fbtft_property_value(dev, "height");
1158 pdata->display.regwidth = fbtft_property_value(dev, "regwidth");
1159 pdata->display.buswidth = fbtft_property_value(dev, "buswidth");
1160 pdata->display.backlight = fbtft_property_value(dev, "backlight");
1161 pdata->display.bpp = fbtft_property_value(dev, "bpp");
1162 pdata->display.debug = fbtft_property_value(dev, "debug");
1163 pdata->rotate = fbtft_property_value(dev, "rotate");
1164 pdata->bgr = device_property_read_bool(dev, "bgr");
1165 pdata->fps = fbtft_property_value(dev, "fps");
1166 pdata->txbuflen = fbtft_property_value(dev, "txbuflen");
1167 pdata->startbyte = fbtft_property_value(dev, "startbyte");
1168 device_property_read_string(dev, "gamma", (const char **)&pdata->gamma);
1169
1170 if (device_property_present(dev, "led-gpios"))
1171 pdata->display.backlight = 1;
1172 if (device_property_present(dev, "init"))
1173 pdata->display.fbtftops.init_display =
1174 fbtft_init_display_from_property;
1175
1176 pdata->display.fbtftops.request_gpios = fbtft_request_gpios;
1177
1178 return pdata;
1179 }
1180
1181 /**
1182 * fbtft_probe_common() - Generic device probe() helper function
1183 * @display: Display properties
1184 * @sdev: SPI device
1185 * @pdev: Platform device
1186 *
1187 * Allocates, initializes and registers a framebuffer
1188 *
1189 * Either @sdev or @pdev should be NULL
1190 *
1191 * Return: 0 if successful, negative if error
1192 */
fbtft_probe_common(struct fbtft_display * display,struct spi_device * sdev,struct platform_device * pdev)1193 int fbtft_probe_common(struct fbtft_display *display,
1194 struct spi_device *sdev,
1195 struct platform_device *pdev)
1196 {
1197 struct device *dev;
1198 struct fb_info *info;
1199 struct fbtft_par *par;
1200 struct fbtft_platform_data *pdata;
1201 int ret;
1202
1203 if (sdev)
1204 dev = &sdev->dev;
1205 else
1206 dev = &pdev->dev;
1207
1208 if (unlikely(display->debug & DEBUG_DRIVER_INIT_FUNCTIONS))
1209 dev_info(dev, "%s()\n", __func__);
1210
1211 pdata = dev->platform_data;
1212 if (!pdata) {
1213 pdata = fbtft_properties_read(dev);
1214 if (IS_ERR(pdata))
1215 return PTR_ERR(pdata);
1216 }
1217
1218 info = fbtft_framebuffer_alloc(display, dev, pdata);
1219 if (!info)
1220 return -ENOMEM;
1221
1222 par = info->par;
1223 par->spi = sdev;
1224 par->pdev = pdev;
1225
1226 if (display->buswidth == 0) {
1227 dev_err(dev, "buswidth is not set\n");
1228 return -EINVAL;
1229 }
1230
1231 /* write register functions */
1232 if (display->regwidth == 8 && display->buswidth == 8)
1233 par->fbtftops.write_register = fbtft_write_reg8_bus8;
1234 else if (display->regwidth == 8 && display->buswidth == 9 && par->spi)
1235 par->fbtftops.write_register = fbtft_write_reg8_bus9;
1236 else if (display->regwidth == 16 && display->buswidth == 8)
1237 par->fbtftops.write_register = fbtft_write_reg16_bus8;
1238 else if (display->regwidth == 16 && display->buswidth == 16)
1239 par->fbtftops.write_register = fbtft_write_reg16_bus16;
1240 else
1241 dev_warn(dev,
1242 "no default functions for regwidth=%d and buswidth=%d\n",
1243 display->regwidth, display->buswidth);
1244
1245 /* write_vmem() functions */
1246 if (display->buswidth == 8)
1247 par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
1248 else if (display->buswidth == 9)
1249 par->fbtftops.write_vmem = fbtft_write_vmem16_bus9;
1250 else if (display->buswidth == 16)
1251 par->fbtftops.write_vmem = fbtft_write_vmem16_bus16;
1252
1253 /* GPIO write() functions */
1254 if (par->pdev) {
1255 if (display->buswidth == 8)
1256 par->fbtftops.write = fbtft_write_gpio8_wr;
1257 else if (display->buswidth == 16)
1258 par->fbtftops.write = fbtft_write_gpio16_wr;
1259 }
1260
1261 /* 9-bit SPI setup */
1262 if (par->spi && display->buswidth == 9) {
1263 if (par->spi->master->bits_per_word_mask & SPI_BPW_MASK(9)) {
1264 par->spi->bits_per_word = 9;
1265 } else {
1266 dev_warn(&par->spi->dev,
1267 "9-bit SPI not available, emulating using 8-bit.\n");
1268 /* allocate buffer with room for dc bits */
1269 par->extra = devm_kzalloc(par->info->device,
1270 par->txbuf.len +
1271 (par->txbuf.len / 8) + 8,
1272 GFP_KERNEL);
1273 if (!par->extra) {
1274 ret = -ENOMEM;
1275 goto out_release;
1276 }
1277 par->fbtftops.write = fbtft_write_spi_emulate_9;
1278 }
1279 }
1280
1281 if (!par->fbtftops.verify_gpios)
1282 par->fbtftops.verify_gpios = fbtft_verify_gpios;
1283
1284 /* make sure we still use the driver provided functions */
1285 fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
1286
1287 /* use init_sequence if provided */
1288 if (par->init_sequence)
1289 par->fbtftops.init_display = fbtft_init_display;
1290
1291 /* use platform_data provided functions above all */
1292 fbtft_merge_fbtftops(&par->fbtftops, &pdata->display.fbtftops);
1293
1294 ret = fbtft_register_framebuffer(info);
1295 if (ret < 0)
1296 goto out_release;
1297
1298 return 0;
1299
1300 out_release:
1301 fbtft_framebuffer_release(info);
1302
1303 return ret;
1304 }
1305 EXPORT_SYMBOL(fbtft_probe_common);
1306
1307 /**
1308 * fbtft_remove_common() - Generic device remove() helper function
1309 * @dev: Device
1310 * @info: Framebuffer
1311 *
1312 * Unregisters and releases the framebuffer
1313 */
fbtft_remove_common(struct device * dev,struct fb_info * info)1314 void fbtft_remove_common(struct device *dev, struct fb_info *info)
1315 {
1316 struct fbtft_par *par;
1317
1318 par = info->par;
1319 if (par)
1320 fbtft_par_dbg(DEBUG_DRIVER_INIT_FUNCTIONS, par,
1321 "%s()\n", __func__);
1322 fbtft_unregister_framebuffer(info);
1323 fbtft_framebuffer_release(info);
1324 }
1325 EXPORT_SYMBOL(fbtft_remove_common);
1326
1327 MODULE_LICENSE("GPL");
1328