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 ((bd->props.power == FB_BLANK_UNBLANK) &&
141 (bd->props.fb_blank == FB_BLANK_UNBLANK))
142 gpiod_set_value(par->gpio.led[0], polarity);
143 else
144 gpiod_set_value(par->gpio.led[0], !polarity);
145
146 return 0;
147 }
148
fbtft_backlight_get_brightness(struct backlight_device * bd)149 static int fbtft_backlight_get_brightness(struct backlight_device *bd)
150 {
151 return bd->props.brightness;
152 }
153
fbtft_unregister_backlight(struct fbtft_par * par)154 void fbtft_unregister_backlight(struct fbtft_par *par)
155 {
156 if (par->info->bl_dev) {
157 par->info->bl_dev->props.power = FB_BLANK_POWERDOWN;
158 backlight_update_status(par->info->bl_dev);
159 backlight_device_unregister(par->info->bl_dev);
160 par->info->bl_dev = NULL;
161 }
162 }
163 EXPORT_SYMBOL(fbtft_unregister_backlight);
164
165 static const struct backlight_ops fbtft_bl_ops = {
166 .get_brightness = fbtft_backlight_get_brightness,
167 .update_status = fbtft_backlight_update_status,
168 };
169
fbtft_register_backlight(struct fbtft_par * par)170 void fbtft_register_backlight(struct fbtft_par *par)
171 {
172 struct backlight_device *bd;
173 struct backlight_properties bl_props = { 0, };
174
175 if (!par->gpio.led[0]) {
176 fbtft_par_dbg(DEBUG_BACKLIGHT, par,
177 "%s(): led pin not set, exiting.\n", __func__);
178 return;
179 }
180
181 bl_props.type = BACKLIGHT_RAW;
182 /* Assume backlight is off, get polarity from current state of pin */
183 bl_props.power = FB_BLANK_POWERDOWN;
184 if (!gpiod_get_value(par->gpio.led[0]))
185 par->polarity = true;
186
187 bd = backlight_device_register(dev_driver_string(par->info->device),
188 par->info->device, par,
189 &fbtft_bl_ops, &bl_props);
190 if (IS_ERR(bd)) {
191 dev_err(par->info->device,
192 "cannot register backlight device (%ld)\n",
193 PTR_ERR(bd));
194 return;
195 }
196 par->info->bl_dev = bd;
197
198 if (!par->fbtftops.unregister_backlight)
199 par->fbtftops.unregister_backlight = fbtft_unregister_backlight;
200 }
201 EXPORT_SYMBOL(fbtft_register_backlight);
202
fbtft_set_addr_win(struct fbtft_par * par,int xs,int ys,int xe,int ye)203 static void fbtft_set_addr_win(struct fbtft_par *par, int xs, int ys, int xe,
204 int ye)
205 {
206 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
207 (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
208
209 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
210 (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
211
212 write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
213 }
214
fbtft_reset(struct fbtft_par * par)215 static void fbtft_reset(struct fbtft_par *par)
216 {
217 if (!par->gpio.reset)
218 return;
219
220 fbtft_par_dbg(DEBUG_RESET, par, "%s()\n", __func__);
221
222 gpiod_set_value_cansleep(par->gpio.reset, 1);
223 usleep_range(20, 40);
224 gpiod_set_value_cansleep(par->gpio.reset, 0);
225 msleep(120);
226
227 gpiod_set_value_cansleep(par->gpio.cs, 1); /* Activate chip */
228 }
229
fbtft_update_display(struct fbtft_par * par,unsigned int start_line,unsigned int end_line)230 static void fbtft_update_display(struct fbtft_par *par, unsigned int start_line,
231 unsigned int end_line)
232 {
233 size_t offset, len;
234 ktime_t ts_start, ts_end;
235 long fps, throughput;
236 bool timeit = false;
237 int ret = 0;
238
239 if (unlikely(par->debug & (DEBUG_TIME_FIRST_UPDATE |
240 DEBUG_TIME_EACH_UPDATE))) {
241 if ((par->debug & DEBUG_TIME_EACH_UPDATE) ||
242 ((par->debug & DEBUG_TIME_FIRST_UPDATE) &&
243 !par->first_update_done)) {
244 ts_start = ktime_get();
245 timeit = true;
246 }
247 }
248
249 /* Sanity checks */
250 if (start_line > end_line) {
251 dev_warn(par->info->device,
252 "%s: start_line=%u is larger than end_line=%u. Shouldn't happen, will do full display update\n",
253 __func__, start_line, end_line);
254 start_line = 0;
255 end_line = par->info->var.yres - 1;
256 }
257 if (start_line > par->info->var.yres - 1 ||
258 end_line > par->info->var.yres - 1) {
259 dev_warn(par->info->device,
260 "%s: start_line=%u or end_line=%u is larger than max=%d. Shouldn't happen, will do full display update\n",
261 __func__, start_line,
262 end_line, par->info->var.yres - 1);
263 start_line = 0;
264 end_line = par->info->var.yres - 1;
265 }
266
267 fbtft_par_dbg(DEBUG_UPDATE_DISPLAY, par, "%s(start_line=%u, end_line=%u)\n",
268 __func__, start_line, end_line);
269
270 if (par->fbtftops.set_addr_win)
271 par->fbtftops.set_addr_win(par, 0, start_line,
272 par->info->var.xres - 1, end_line);
273
274 offset = start_line * par->info->fix.line_length;
275 len = (end_line - start_line + 1) * par->info->fix.line_length;
276 ret = par->fbtftops.write_vmem(par, offset, len);
277 if (ret < 0)
278 dev_err(par->info->device,
279 "%s: write_vmem failed to update display buffer\n",
280 __func__);
281
282 if (unlikely(timeit)) {
283 ts_end = ktime_get();
284 if (!ktime_to_ns(par->update_time))
285 par->update_time = ts_start;
286
287 fps = ktime_us_delta(ts_start, par->update_time);
288 par->update_time = ts_start;
289 fps = fps ? 1000000 / fps : 0;
290
291 throughput = ktime_us_delta(ts_end, ts_start);
292 throughput = throughput ? (len * 1000) / throughput : 0;
293 throughput = throughput * 1000 / 1024;
294
295 dev_info(par->info->device,
296 "Display update: %ld kB/s, fps=%ld\n",
297 throughput, fps);
298 par->first_update_done = true;
299 }
300 }
301
fbtft_mkdirty(struct fb_info * info,int y,int height)302 static void fbtft_mkdirty(struct fb_info *info, int y, int height)
303 {
304 struct fbtft_par *par = info->par;
305 struct fb_deferred_io *fbdefio = info->fbdefio;
306
307 /* special case, needed ? */
308 if (y == -1) {
309 y = 0;
310 height = info->var.yres;
311 }
312
313 /* Mark display lines/area as dirty */
314 spin_lock(&par->dirty_lock);
315 if (y < par->dirty_lines_start)
316 par->dirty_lines_start = y;
317 if (y + height - 1 > par->dirty_lines_end)
318 par->dirty_lines_end = y + height - 1;
319 spin_unlock(&par->dirty_lock);
320
321 /* Schedule deferred_io to update display (no-op if already on queue)*/
322 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
323 }
324
fbtft_deferred_io(struct fb_info * info,struct list_head * pagereflist)325 static void fbtft_deferred_io(struct fb_info *info, struct list_head *pagereflist)
326 {
327 struct fbtft_par *par = info->par;
328 unsigned int dirty_lines_start, dirty_lines_end;
329 struct fb_deferred_io_pageref *pageref;
330 unsigned int y_low = 0, y_high = 0;
331 int count = 0;
332
333 spin_lock(&par->dirty_lock);
334 dirty_lines_start = par->dirty_lines_start;
335 dirty_lines_end = par->dirty_lines_end;
336 /* set display line markers as clean */
337 par->dirty_lines_start = par->info->var.yres - 1;
338 par->dirty_lines_end = 0;
339 spin_unlock(&par->dirty_lock);
340
341 /* Mark display lines as dirty */
342 list_for_each_entry(pageref, pagereflist, list) {
343 count++;
344 y_low = pageref->offset / info->fix.line_length;
345 y_high = (pageref->offset + PAGE_SIZE - 1) / info->fix.line_length;
346 dev_dbg(info->device,
347 "page->index=%lu y_low=%d y_high=%d\n",
348 pageref->page->index, y_low, y_high);
349 if (y_high > info->var.yres - 1)
350 y_high = info->var.yres - 1;
351 if (y_low < dirty_lines_start)
352 dirty_lines_start = y_low;
353 if (y_high > dirty_lines_end)
354 dirty_lines_end = y_high;
355 }
356
357 par->fbtftops.update_display(info->par,
358 dirty_lines_start, dirty_lines_end);
359 }
360
fbtft_fb_fillrect(struct fb_info * info,const struct fb_fillrect * rect)361 static void fbtft_fb_fillrect(struct fb_info *info,
362 const struct fb_fillrect *rect)
363 {
364 struct fbtft_par *par = info->par;
365
366 dev_dbg(info->dev,
367 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
368 __func__, rect->dx, rect->dy, rect->width, rect->height);
369 sys_fillrect(info, rect);
370
371 par->fbtftops.mkdirty(info, rect->dy, rect->height);
372 }
373
fbtft_fb_copyarea(struct fb_info * info,const struct fb_copyarea * area)374 static void fbtft_fb_copyarea(struct fb_info *info,
375 const struct fb_copyarea *area)
376 {
377 struct fbtft_par *par = info->par;
378
379 dev_dbg(info->dev,
380 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
381 __func__, area->dx, area->dy, area->width, area->height);
382 sys_copyarea(info, area);
383
384 par->fbtftops.mkdirty(info, area->dy, area->height);
385 }
386
fbtft_fb_imageblit(struct fb_info * info,const struct fb_image * image)387 static void fbtft_fb_imageblit(struct fb_info *info,
388 const struct fb_image *image)
389 {
390 struct fbtft_par *par = info->par;
391
392 dev_dbg(info->dev,
393 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
394 __func__, image->dx, image->dy, image->width, image->height);
395 sys_imageblit(info, image);
396
397 par->fbtftops.mkdirty(info, image->dy, image->height);
398 }
399
fbtft_fb_write(struct fb_info * info,const char __user * buf,size_t count,loff_t * ppos)400 static ssize_t fbtft_fb_write(struct fb_info *info, const char __user *buf,
401 size_t count, loff_t *ppos)
402 {
403 struct fbtft_par *par = info->par;
404 ssize_t res;
405
406 dev_dbg(info->dev,
407 "%s: count=%zd, ppos=%llu\n", __func__, count, *ppos);
408 res = fb_sys_write(info, buf, count, ppos);
409
410 /* TODO: only mark changed area update all for now */
411 par->fbtftops.mkdirty(info, -1, 0);
412
413 return res;
414 }
415
416 /* from pxafb.c */
chan_to_field(unsigned int chan,struct fb_bitfield * bf)417 static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
418 {
419 chan &= 0xffff;
420 chan >>= 16 - bf->length;
421 return chan << bf->offset;
422 }
423
fbtft_fb_setcolreg(unsigned int regno,unsigned int red,unsigned int green,unsigned int blue,unsigned int transp,struct fb_info * info)424 static int fbtft_fb_setcolreg(unsigned int regno, unsigned int red,
425 unsigned int green, unsigned int blue,
426 unsigned int transp, struct fb_info *info)
427 {
428 unsigned int val;
429 int ret = 1;
430
431 dev_dbg(info->dev,
432 "%s(regno=%u, red=0x%X, green=0x%X, blue=0x%X, trans=0x%X)\n",
433 __func__, regno, red, green, blue, transp);
434
435 switch (info->fix.visual) {
436 case FB_VISUAL_TRUECOLOR:
437 if (regno < 16) {
438 u32 *pal = info->pseudo_palette;
439
440 val = chan_to_field(red, &info->var.red);
441 val |= chan_to_field(green, &info->var.green);
442 val |= chan_to_field(blue, &info->var.blue);
443
444 pal[regno] = val;
445 ret = 0;
446 }
447 break;
448 }
449 return ret;
450 }
451
fbtft_fb_blank(int blank,struct fb_info * info)452 static int fbtft_fb_blank(int blank, struct fb_info *info)
453 {
454 struct fbtft_par *par = info->par;
455 int ret = -EINVAL;
456
457 dev_dbg(info->dev, "%s(blank=%d)\n",
458 __func__, blank);
459
460 if (!par->fbtftops.blank)
461 return ret;
462
463 switch (blank) {
464 case FB_BLANK_POWERDOWN:
465 case FB_BLANK_VSYNC_SUSPEND:
466 case FB_BLANK_HSYNC_SUSPEND:
467 case FB_BLANK_NORMAL:
468 ret = par->fbtftops.blank(par, true);
469 break;
470 case FB_BLANK_UNBLANK:
471 ret = par->fbtftops.blank(par, false);
472 break;
473 }
474 return ret;
475 }
476
fbtft_merge_fbtftops(struct fbtft_ops * dst,struct fbtft_ops * src)477 static void fbtft_merge_fbtftops(struct fbtft_ops *dst, struct fbtft_ops *src)
478 {
479 if (src->write)
480 dst->write = src->write;
481 if (src->read)
482 dst->read = src->read;
483 if (src->write_vmem)
484 dst->write_vmem = src->write_vmem;
485 if (src->write_register)
486 dst->write_register = src->write_register;
487 if (src->set_addr_win)
488 dst->set_addr_win = src->set_addr_win;
489 if (src->reset)
490 dst->reset = src->reset;
491 if (src->mkdirty)
492 dst->mkdirty = src->mkdirty;
493 if (src->update_display)
494 dst->update_display = src->update_display;
495 if (src->init_display)
496 dst->init_display = src->init_display;
497 if (src->blank)
498 dst->blank = src->blank;
499 if (src->request_gpios_match)
500 dst->request_gpios_match = src->request_gpios_match;
501 if (src->request_gpios)
502 dst->request_gpios = src->request_gpios;
503 if (src->verify_gpios)
504 dst->verify_gpios = src->verify_gpios;
505 if (src->register_backlight)
506 dst->register_backlight = src->register_backlight;
507 if (src->unregister_backlight)
508 dst->unregister_backlight = src->unregister_backlight;
509 if (src->set_var)
510 dst->set_var = src->set_var;
511 if (src->set_gamma)
512 dst->set_gamma = src->set_gamma;
513 }
514
515 /**
516 * fbtft_framebuffer_alloc - creates a new frame buffer info structure
517 *
518 * @display: pointer to structure describing the display
519 * @dev: pointer to the device for this fb, this can be NULL
520 * @pdata: platform data for the display in use
521 *
522 * Creates a new frame buffer info structure.
523 *
524 * Also creates and populates the following structures:
525 * info->fbops
526 * info->fbdefio
527 * info->pseudo_palette
528 * par->fbtftops
529 * par->txbuf
530 *
531 * Returns the new structure, or NULL if an error occurred.
532 *
533 */
fbtft_framebuffer_alloc(struct fbtft_display * display,struct device * dev,struct fbtft_platform_data * pdata)534 struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
535 struct device *dev,
536 struct fbtft_platform_data *pdata)
537 {
538 struct fb_info *info;
539 struct fbtft_par *par;
540 struct fb_ops *fbops = NULL;
541 struct fb_deferred_io *fbdefio = NULL;
542 u8 *vmem = NULL;
543 void *txbuf = NULL;
544 void *buf = NULL;
545 unsigned int width;
546 unsigned int height;
547 int txbuflen = display->txbuflen;
548 unsigned int bpp = display->bpp;
549 unsigned int fps = display->fps;
550 int vmem_size;
551 const s16 *init_sequence = display->init_sequence;
552 char *gamma = display->gamma;
553 u32 *gamma_curves = NULL;
554
555 /* sanity check */
556 if (display->gamma_num * display->gamma_len >
557 FBTFT_GAMMA_MAX_VALUES_TOTAL) {
558 dev_err(dev, "FBTFT_GAMMA_MAX_VALUES_TOTAL=%d is exceeded\n",
559 FBTFT_GAMMA_MAX_VALUES_TOTAL);
560 return NULL;
561 }
562
563 /* defaults */
564 if (!fps)
565 fps = 20;
566 if (!bpp)
567 bpp = 16;
568
569 if (!pdata) {
570 dev_err(dev, "platform data is missing\n");
571 return NULL;
572 }
573
574 /* override driver values? */
575 if (pdata->fps)
576 fps = pdata->fps;
577 if (pdata->txbuflen)
578 txbuflen = pdata->txbuflen;
579 if (pdata->display.init_sequence)
580 init_sequence = pdata->display.init_sequence;
581 if (pdata->gamma)
582 gamma = pdata->gamma;
583 if (pdata->display.debug)
584 display->debug = pdata->display.debug;
585 if (pdata->display.backlight)
586 display->backlight = pdata->display.backlight;
587 if (pdata->display.width)
588 display->width = pdata->display.width;
589 if (pdata->display.height)
590 display->height = pdata->display.height;
591 if (pdata->display.buswidth)
592 display->buswidth = pdata->display.buswidth;
593 if (pdata->display.regwidth)
594 display->regwidth = pdata->display.regwidth;
595
596 display->debug |= debug;
597 fbtft_expand_debug_value(&display->debug);
598
599 switch (pdata->rotate) {
600 case 90:
601 case 270:
602 width = display->height;
603 height = display->width;
604 break;
605 default:
606 width = display->width;
607 height = display->height;
608 }
609
610 vmem_size = display->width * display->height * bpp / 8;
611 vmem = vzalloc(vmem_size);
612 if (!vmem)
613 goto alloc_fail;
614
615 fbops = devm_kzalloc(dev, sizeof(struct fb_ops), GFP_KERNEL);
616 if (!fbops)
617 goto alloc_fail;
618
619 fbdefio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL);
620 if (!fbdefio)
621 goto alloc_fail;
622
623 buf = devm_kzalloc(dev, 128, GFP_KERNEL);
624 if (!buf)
625 goto alloc_fail;
626
627 if (display->gamma_num && display->gamma_len) {
628 gamma_curves = devm_kcalloc(dev,
629 display->gamma_num *
630 display->gamma_len,
631 sizeof(gamma_curves[0]),
632 GFP_KERNEL);
633 if (!gamma_curves)
634 goto alloc_fail;
635 }
636
637 info = framebuffer_alloc(sizeof(struct fbtft_par), dev);
638 if (!info)
639 goto alloc_fail;
640
641 info->screen_buffer = vmem;
642 info->fbops = fbops;
643 info->fbdefio = fbdefio;
644
645 fbops->owner = dev->driver->owner;
646 fbops->fb_read = fb_sys_read;
647 fbops->fb_write = fbtft_fb_write;
648 fbops->fb_fillrect = fbtft_fb_fillrect;
649 fbops->fb_copyarea = fbtft_fb_copyarea;
650 fbops->fb_imageblit = fbtft_fb_imageblit;
651 fbops->fb_setcolreg = fbtft_fb_setcolreg;
652 fbops->fb_blank = fbtft_fb_blank;
653 fbops->fb_mmap = fb_deferred_io_mmap;
654
655 fbdefio->delay = HZ / fps;
656 fbdefio->sort_pagereflist = true;
657 fbdefio->deferred_io = fbtft_deferred_io;
658
659 snprintf(info->fix.id, sizeof(info->fix.id), "%s", dev->driver->name);
660 info->fix.type = FB_TYPE_PACKED_PIXELS;
661 info->fix.visual = FB_VISUAL_TRUECOLOR;
662 info->fix.xpanstep = 0;
663 info->fix.ypanstep = 0;
664 info->fix.ywrapstep = 0;
665 info->fix.line_length = width * bpp / 8;
666 info->fix.accel = FB_ACCEL_NONE;
667 info->fix.smem_len = vmem_size;
668 fb_deferred_io_init(info);
669
670 info->var.rotate = pdata->rotate;
671 info->var.xres = width;
672 info->var.yres = height;
673 info->var.xres_virtual = info->var.xres;
674 info->var.yres_virtual = info->var.yres;
675 info->var.bits_per_pixel = bpp;
676 info->var.nonstd = 1;
677
678 /* RGB565 */
679 info->var.red.offset = 11;
680 info->var.red.length = 5;
681 info->var.green.offset = 5;
682 info->var.green.length = 6;
683 info->var.blue.offset = 0;
684 info->var.blue.length = 5;
685 info->var.transp.offset = 0;
686 info->var.transp.length = 0;
687
688 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
689
690 par = info->par;
691 par->info = info;
692 par->pdata = pdata;
693 par->debug = display->debug;
694 par->buf = buf;
695 spin_lock_init(&par->dirty_lock);
696 par->bgr = pdata->bgr;
697 par->startbyte = pdata->startbyte;
698 par->init_sequence = init_sequence;
699 par->gamma.curves = gamma_curves;
700 par->gamma.num_curves = display->gamma_num;
701 par->gamma.num_values = display->gamma_len;
702 mutex_init(&par->gamma.lock);
703 info->pseudo_palette = par->pseudo_palette;
704
705 if (par->gamma.curves && gamma) {
706 if (fbtft_gamma_parse_str(par, par->gamma.curves, gamma,
707 strlen(gamma)))
708 goto release_framebuf;
709 }
710
711 /* Transmit buffer */
712 if (txbuflen == -1)
713 txbuflen = vmem_size + 2; /* add in case startbyte is used */
714 if (txbuflen >= vmem_size + 2)
715 txbuflen = 0;
716
717 #ifdef __LITTLE_ENDIAN
718 if ((!txbuflen) && (bpp > 8))
719 txbuflen = PAGE_SIZE; /* need buffer for byteswapping */
720 #endif
721
722 if (txbuflen > 0) {
723 txbuf = devm_kzalloc(par->info->device, txbuflen, GFP_KERNEL);
724 if (!txbuf)
725 goto release_framebuf;
726 par->txbuf.buf = txbuf;
727 par->txbuf.len = txbuflen;
728 }
729
730 /* default fbtft operations */
731 par->fbtftops.write = fbtft_write_spi;
732 par->fbtftops.read = fbtft_read_spi;
733 par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
734 par->fbtftops.write_register = fbtft_write_reg8_bus8;
735 par->fbtftops.set_addr_win = fbtft_set_addr_win;
736 par->fbtftops.reset = fbtft_reset;
737 par->fbtftops.mkdirty = fbtft_mkdirty;
738 par->fbtftops.update_display = fbtft_update_display;
739 if (display->backlight)
740 par->fbtftops.register_backlight = fbtft_register_backlight;
741
742 /* use driver provided functions */
743 fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
744
745 return info;
746
747 release_framebuf:
748 framebuffer_release(info);
749
750 alloc_fail:
751 vfree(vmem);
752
753 return NULL;
754 }
755 EXPORT_SYMBOL(fbtft_framebuffer_alloc);
756
757 /**
758 * fbtft_framebuffer_release - frees up all memory used by the framebuffer
759 *
760 * @info: frame buffer info structure
761 *
762 */
fbtft_framebuffer_release(struct fb_info * info)763 void fbtft_framebuffer_release(struct fb_info *info)
764 {
765 fb_deferred_io_cleanup(info);
766 vfree(info->screen_buffer);
767 framebuffer_release(info);
768 }
769 EXPORT_SYMBOL(fbtft_framebuffer_release);
770
771 /**
772 * fbtft_register_framebuffer - registers a tft frame buffer device
773 * @fb_info: frame buffer info structure
774 *
775 * Sets SPI driverdata if needed
776 * Requests needed gpios.
777 * Initializes display
778 * Updates display.
779 * Registers a frame buffer device @fb_info.
780 *
781 * Returns negative errno on error, or zero for success.
782 *
783 */
fbtft_register_framebuffer(struct fb_info * fb_info)784 int fbtft_register_framebuffer(struct fb_info *fb_info)
785 {
786 int ret;
787 char text1[50] = "";
788 char text2[50] = "";
789 struct fbtft_par *par = fb_info->par;
790 struct spi_device *spi = par->spi;
791
792 /* sanity checks */
793 if (!par->fbtftops.init_display) {
794 dev_err(fb_info->device, "missing fbtftops.init_display()\n");
795 return -EINVAL;
796 }
797
798 if (spi)
799 spi_set_drvdata(spi, fb_info);
800 if (par->pdev)
801 platform_set_drvdata(par->pdev, fb_info);
802
803 ret = par->fbtftops.request_gpios(par);
804 if (ret < 0)
805 goto reg_fail;
806
807 if (par->fbtftops.verify_gpios) {
808 ret = par->fbtftops.verify_gpios(par);
809 if (ret < 0)
810 goto reg_fail;
811 }
812
813 ret = par->fbtftops.init_display(par);
814 if (ret < 0)
815 goto reg_fail;
816 if (par->fbtftops.set_var) {
817 ret = par->fbtftops.set_var(par);
818 if (ret < 0)
819 goto reg_fail;
820 }
821
822 /* update the entire display */
823 par->fbtftops.update_display(par, 0, par->info->var.yres - 1);
824
825 if (par->fbtftops.set_gamma && par->gamma.curves) {
826 ret = par->fbtftops.set_gamma(par, par->gamma.curves);
827 if (ret)
828 goto reg_fail;
829 }
830
831 if (par->fbtftops.register_backlight)
832 par->fbtftops.register_backlight(par);
833
834 ret = register_framebuffer(fb_info);
835 if (ret < 0)
836 goto reg_fail;
837
838 fbtft_sysfs_init(par);
839
840 if (par->txbuf.buf && par->txbuf.len >= 1024)
841 sprintf(text1, ", %zu KiB buffer memory", par->txbuf.len >> 10);
842 if (spi)
843 sprintf(text2, ", spi%d.%d at %d MHz", spi->master->bus_num,
844 spi->chip_select, spi->max_speed_hz / 1000000);
845 dev_info(fb_info->dev,
846 "%s frame buffer, %dx%d, %d KiB video memory%s, fps=%lu%s\n",
847 fb_info->fix.id, fb_info->var.xres, fb_info->var.yres,
848 fb_info->fix.smem_len >> 10, text1,
849 HZ / fb_info->fbdefio->delay, text2);
850
851 /* Turn on backlight if available */
852 if (fb_info->bl_dev) {
853 fb_info->bl_dev->props.power = FB_BLANK_UNBLANK;
854 fb_info->bl_dev->ops->update_status(fb_info->bl_dev);
855 }
856
857 return 0;
858
859 reg_fail:
860 if (par->fbtftops.unregister_backlight)
861 par->fbtftops.unregister_backlight(par);
862
863 return ret;
864 }
865 EXPORT_SYMBOL(fbtft_register_framebuffer);
866
867 /**
868 * fbtft_unregister_framebuffer - releases a tft frame buffer device
869 * @fb_info: frame buffer info structure
870 *
871 * Frees SPI driverdata if needed
872 * Frees gpios.
873 * Unregisters frame buffer device.
874 *
875 */
fbtft_unregister_framebuffer(struct fb_info * fb_info)876 int fbtft_unregister_framebuffer(struct fb_info *fb_info)
877 {
878 struct fbtft_par *par = fb_info->par;
879
880 if (par->fbtftops.unregister_backlight)
881 par->fbtftops.unregister_backlight(par);
882 fbtft_sysfs_exit(par);
883 unregister_framebuffer(fb_info);
884
885 return 0;
886 }
887 EXPORT_SYMBOL(fbtft_unregister_framebuffer);
888
889 /**
890 * fbtft_init_display_from_property() - Device Tree init_display() function
891 * @par: Driver data
892 *
893 * Return: 0 if successful, negative if error
894 */
fbtft_init_display_from_property(struct fbtft_par * par)895 static int fbtft_init_display_from_property(struct fbtft_par *par)
896 {
897 struct device *dev = par->info->device;
898 int buf[64], count, index, i, j, ret;
899 u32 *values;
900 u32 val;
901
902 count = device_property_count_u32(dev, "init");
903 if (count < 0)
904 return count;
905 if (count == 0)
906 return -EINVAL;
907
908 values = kmalloc_array(count + 1, sizeof(*values), GFP_KERNEL);
909 if (!values)
910 return -ENOMEM;
911
912 ret = device_property_read_u32_array(dev, "init", values, count);
913 if (ret)
914 goto out_free;
915
916 par->fbtftops.reset(par);
917
918 index = -1;
919 val = values[++index];
920
921 while (index < count) {
922 if (val & FBTFT_OF_INIT_CMD) {
923 val &= 0xFFFF;
924 i = 0;
925 while ((index < count) && !(val & 0xFFFF0000)) {
926 if (i > 63) {
927 dev_err(dev,
928 "%s: Maximum register values exceeded\n",
929 __func__);
930 ret = -EINVAL;
931 goto out_free;
932 }
933 buf[i++] = val;
934 val = values[++index];
935 }
936 /* make debug message */
937 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
938 "init: write_register:\n");
939 for (j = 0; j < i; j++)
940 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
941 "buf[%d] = %02X\n", j, buf[j]);
942
943 par->fbtftops.write_register(par, i,
944 buf[0], buf[1], buf[2], buf[3],
945 buf[4], buf[5], buf[6], buf[7],
946 buf[8], buf[9], buf[10], buf[11],
947 buf[12], buf[13], buf[14], buf[15],
948 buf[16], buf[17], buf[18], buf[19],
949 buf[20], buf[21], buf[22], buf[23],
950 buf[24], buf[25], buf[26], buf[27],
951 buf[28], buf[29], buf[30], buf[31],
952 buf[32], buf[33], buf[34], buf[35],
953 buf[36], buf[37], buf[38], buf[39],
954 buf[40], buf[41], buf[42], buf[43],
955 buf[44], buf[45], buf[46], buf[47],
956 buf[48], buf[49], buf[50], buf[51],
957 buf[52], buf[53], buf[54], buf[55],
958 buf[56], buf[57], buf[58], buf[59],
959 buf[60], buf[61], buf[62], buf[63]);
960 } else if (val & FBTFT_OF_INIT_DELAY) {
961 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
962 "init: msleep(%u)\n", val & 0xFFFF);
963 msleep(val & 0xFFFF);
964 val = values[++index];
965 } else {
966 dev_err(dev, "illegal init value 0x%X\n", val);
967 ret = -EINVAL;
968 goto out_free;
969 }
970 }
971
972 out_free:
973 kfree(values);
974 return ret;
975 }
976
977 /**
978 * fbtft_init_display() - Generic init_display() function
979 * @par: Driver data
980 *
981 * Uses par->init_sequence to do the initialization
982 *
983 * Return: 0 if successful, negative if error
984 */
fbtft_init_display(struct fbtft_par * par)985 int fbtft_init_display(struct fbtft_par *par)
986 {
987 int buf[64];
988 int i;
989 int j;
990
991 /* sanity check */
992 if (!par->init_sequence) {
993 dev_err(par->info->device,
994 "error: init_sequence is not set\n");
995 return -EINVAL;
996 }
997
998 /* make sure stop marker exists */
999 for (i = 0; i < FBTFT_MAX_INIT_SEQUENCE; i++) {
1000 if (par->init_sequence[i] == -3)
1001 break;
1002 }
1003
1004 if (i == FBTFT_MAX_INIT_SEQUENCE) {
1005 dev_err(par->info->device,
1006 "missing stop marker at end of init sequence\n");
1007 return -EINVAL;
1008 }
1009
1010 par->fbtftops.reset(par);
1011
1012 i = 0;
1013 while (i < FBTFT_MAX_INIT_SEQUENCE) {
1014 if (par->init_sequence[i] == -3) {
1015 /* done */
1016 return 0;
1017 }
1018 if (par->init_sequence[i] >= 0) {
1019 dev_err(par->info->device,
1020 "missing delimiter at position %d\n", i);
1021 return -EINVAL;
1022 }
1023 if (par->init_sequence[i + 1] < 0) {
1024 dev_err(par->info->device,
1025 "missing value after delimiter %d at position %d\n",
1026 par->init_sequence[i], i);
1027 return -EINVAL;
1028 }
1029 switch (par->init_sequence[i]) {
1030 case -1:
1031 i++;
1032
1033 /* make debug message */
1034 for (j = 0; par->init_sequence[i + 1 + j] >= 0; j++)
1035 ;
1036
1037 fbtft_par_dbg_hex(DEBUG_INIT_DISPLAY, par, par->info->device,
1038 s16, &par->init_sequence[i + 1], j,
1039 "init: write(0x%02X)", par->init_sequence[i]);
1040
1041 /* Write */
1042 j = 0;
1043 while (par->init_sequence[i] >= 0) {
1044 if (j > 63) {
1045 dev_err(par->info->device,
1046 "%s: Maximum register values exceeded\n",
1047 __func__);
1048 return -EINVAL;
1049 }
1050 buf[j++] = par->init_sequence[i++];
1051 }
1052 par->fbtftops.write_register(par, j,
1053 buf[0], buf[1], buf[2], buf[3],
1054 buf[4], buf[5], buf[6], buf[7],
1055 buf[8], buf[9], buf[10], buf[11],
1056 buf[12], buf[13], buf[14], buf[15],
1057 buf[16], buf[17], buf[18], buf[19],
1058 buf[20], buf[21], buf[22], buf[23],
1059 buf[24], buf[25], buf[26], buf[27],
1060 buf[28], buf[29], buf[30], buf[31],
1061 buf[32], buf[33], buf[34], buf[35],
1062 buf[36], buf[37], buf[38], buf[39],
1063 buf[40], buf[41], buf[42], buf[43],
1064 buf[44], buf[45], buf[46], buf[47],
1065 buf[48], buf[49], buf[50], buf[51],
1066 buf[52], buf[53], buf[54], buf[55],
1067 buf[56], buf[57], buf[58], buf[59],
1068 buf[60], buf[61], buf[62], buf[63]);
1069 break;
1070 case -2:
1071 i++;
1072 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
1073 "init: mdelay(%d)\n",
1074 par->init_sequence[i]);
1075 mdelay(par->init_sequence[i++]);
1076 break;
1077 default:
1078 dev_err(par->info->device,
1079 "unknown delimiter %d at position %d\n",
1080 par->init_sequence[i], i);
1081 return -EINVAL;
1082 }
1083 }
1084
1085 dev_err(par->info->device,
1086 "%s: something is wrong. Shouldn't get here.\n", __func__);
1087 return -EINVAL;
1088 }
1089 EXPORT_SYMBOL(fbtft_init_display);
1090
1091 /**
1092 * fbtft_verify_gpios() - Generic verify_gpios() function
1093 * @par: Driver data
1094 *
1095 * Uses @spi, @pdev and @buswidth to determine which GPIOs is needed
1096 *
1097 * Return: 0 if successful, negative if error
1098 */
fbtft_verify_gpios(struct fbtft_par * par)1099 static int fbtft_verify_gpios(struct fbtft_par *par)
1100 {
1101 struct fbtft_platform_data *pdata = par->pdata;
1102 int i;
1103
1104 fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);
1105
1106 if (pdata->display.buswidth != 9 && par->startbyte == 0 &&
1107 !par->gpio.dc) {
1108 dev_err(par->info->device,
1109 "Missing info about 'dc' gpio. Aborting.\n");
1110 return -EINVAL;
1111 }
1112
1113 if (!par->pdev)
1114 return 0;
1115
1116 if (!par->gpio.wr) {
1117 dev_err(par->info->device, "Missing 'wr' gpio. Aborting.\n");
1118 return -EINVAL;
1119 }
1120 for (i = 0; i < pdata->display.buswidth; i++) {
1121 if (!par->gpio.db[i]) {
1122 dev_err(par->info->device,
1123 "Missing 'db%02d' gpio. Aborting.\n", i);
1124 return -EINVAL;
1125 }
1126 }
1127
1128 return 0;
1129 }
1130
1131 /* returns 0 if the property is not present */
fbtft_property_value(struct device * dev,const char * propname)1132 static u32 fbtft_property_value(struct device *dev, const char *propname)
1133 {
1134 int ret;
1135 u32 val = 0;
1136
1137 ret = device_property_read_u32(dev, propname, &val);
1138 if (ret == 0)
1139 dev_info(dev, "%s: %s = %u\n", __func__, propname, val);
1140
1141 return val;
1142 }
1143
fbtft_properties_read(struct device * dev)1144 static struct fbtft_platform_data *fbtft_properties_read(struct device *dev)
1145 {
1146 struct fbtft_platform_data *pdata;
1147
1148 if (!dev_fwnode(dev)) {
1149 dev_err(dev, "Missing platform data or properties\n");
1150 return ERR_PTR(-EINVAL);
1151 }
1152
1153 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1154 if (!pdata)
1155 return ERR_PTR(-ENOMEM);
1156
1157 pdata->display.width = fbtft_property_value(dev, "width");
1158 pdata->display.height = fbtft_property_value(dev, "height");
1159 pdata->display.regwidth = fbtft_property_value(dev, "regwidth");
1160 pdata->display.buswidth = fbtft_property_value(dev, "buswidth");
1161 pdata->display.backlight = fbtft_property_value(dev, "backlight");
1162 pdata->display.bpp = fbtft_property_value(dev, "bpp");
1163 pdata->display.debug = fbtft_property_value(dev, "debug");
1164 pdata->rotate = fbtft_property_value(dev, "rotate");
1165 pdata->bgr = device_property_read_bool(dev, "bgr");
1166 pdata->fps = fbtft_property_value(dev, "fps");
1167 pdata->txbuflen = fbtft_property_value(dev, "txbuflen");
1168 pdata->startbyte = fbtft_property_value(dev, "startbyte");
1169 device_property_read_string(dev, "gamma", (const char **)&pdata->gamma);
1170
1171 if (device_property_present(dev, "led-gpios"))
1172 pdata->display.backlight = 1;
1173 if (device_property_present(dev, "init"))
1174 pdata->display.fbtftops.init_display =
1175 fbtft_init_display_from_property;
1176
1177 pdata->display.fbtftops.request_gpios = fbtft_request_gpios;
1178
1179 return pdata;
1180 }
1181
1182 /**
1183 * fbtft_probe_common() - Generic device probe() helper function
1184 * @display: Display properties
1185 * @sdev: SPI device
1186 * @pdev: Platform device
1187 *
1188 * Allocates, initializes and registers a framebuffer
1189 *
1190 * Either @sdev or @pdev should be NULL
1191 *
1192 * Return: 0 if successful, negative if error
1193 */
fbtft_probe_common(struct fbtft_display * display,struct spi_device * sdev,struct platform_device * pdev)1194 int fbtft_probe_common(struct fbtft_display *display,
1195 struct spi_device *sdev,
1196 struct platform_device *pdev)
1197 {
1198 struct device *dev;
1199 struct fb_info *info;
1200 struct fbtft_par *par;
1201 struct fbtft_platform_data *pdata;
1202 int ret;
1203
1204 if (sdev)
1205 dev = &sdev->dev;
1206 else
1207 dev = &pdev->dev;
1208
1209 if (unlikely(display->debug & DEBUG_DRIVER_INIT_FUNCTIONS))
1210 dev_info(dev, "%s()\n", __func__);
1211
1212 pdata = dev->platform_data;
1213 if (!pdata) {
1214 pdata = fbtft_properties_read(dev);
1215 if (IS_ERR(pdata))
1216 return PTR_ERR(pdata);
1217 }
1218
1219 info = fbtft_framebuffer_alloc(display, dev, pdata);
1220 if (!info)
1221 return -ENOMEM;
1222
1223 par = info->par;
1224 par->spi = sdev;
1225 par->pdev = pdev;
1226
1227 if (display->buswidth == 0) {
1228 dev_err(dev, "buswidth is not set\n");
1229 return -EINVAL;
1230 }
1231
1232 /* write register functions */
1233 if (display->regwidth == 8 && display->buswidth == 8)
1234 par->fbtftops.write_register = fbtft_write_reg8_bus8;
1235 else if (display->regwidth == 8 && display->buswidth == 9 && par->spi)
1236 par->fbtftops.write_register = fbtft_write_reg8_bus9;
1237 else if (display->regwidth == 16 && display->buswidth == 8)
1238 par->fbtftops.write_register = fbtft_write_reg16_bus8;
1239 else if (display->regwidth == 16 && display->buswidth == 16)
1240 par->fbtftops.write_register = fbtft_write_reg16_bus16;
1241 else
1242 dev_warn(dev,
1243 "no default functions for regwidth=%d and buswidth=%d\n",
1244 display->regwidth, display->buswidth);
1245
1246 /* write_vmem() functions */
1247 if (display->buswidth == 8)
1248 par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
1249 else if (display->buswidth == 9)
1250 par->fbtftops.write_vmem = fbtft_write_vmem16_bus9;
1251 else if (display->buswidth == 16)
1252 par->fbtftops.write_vmem = fbtft_write_vmem16_bus16;
1253
1254 /* GPIO write() functions */
1255 if (par->pdev) {
1256 if (display->buswidth == 8)
1257 par->fbtftops.write = fbtft_write_gpio8_wr;
1258 else if (display->buswidth == 16)
1259 par->fbtftops.write = fbtft_write_gpio16_wr;
1260 }
1261
1262 /* 9-bit SPI setup */
1263 if (par->spi && display->buswidth == 9) {
1264 if (par->spi->master->bits_per_word_mask & SPI_BPW_MASK(9)) {
1265 par->spi->bits_per_word = 9;
1266 } else {
1267 dev_warn(&par->spi->dev,
1268 "9-bit SPI not available, emulating using 8-bit.\n");
1269 /* allocate buffer with room for dc bits */
1270 par->extra = devm_kzalloc(par->info->device,
1271 par->txbuf.len +
1272 (par->txbuf.len / 8) + 8,
1273 GFP_KERNEL);
1274 if (!par->extra) {
1275 ret = -ENOMEM;
1276 goto out_release;
1277 }
1278 par->fbtftops.write = fbtft_write_spi_emulate_9;
1279 }
1280 }
1281
1282 if (!par->fbtftops.verify_gpios)
1283 par->fbtftops.verify_gpios = fbtft_verify_gpios;
1284
1285 /* make sure we still use the driver provided functions */
1286 fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
1287
1288 /* use init_sequence if provided */
1289 if (par->init_sequence)
1290 par->fbtftops.init_display = fbtft_init_display;
1291
1292 /* use platform_data provided functions above all */
1293 fbtft_merge_fbtftops(&par->fbtftops, &pdata->display.fbtftops);
1294
1295 ret = fbtft_register_framebuffer(info);
1296 if (ret < 0)
1297 goto out_release;
1298
1299 return 0;
1300
1301 out_release:
1302 fbtft_framebuffer_release(info);
1303
1304 return ret;
1305 }
1306 EXPORT_SYMBOL(fbtft_probe_common);
1307
1308 /**
1309 * fbtft_remove_common() - Generic device remove() helper function
1310 * @dev: Device
1311 * @info: Framebuffer
1312 *
1313 * Unregisters and releases the framebuffer
1314 */
fbtft_remove_common(struct device * dev,struct fb_info * info)1315 void fbtft_remove_common(struct device *dev, struct fb_info *info)
1316 {
1317 struct fbtft_par *par;
1318
1319 par = info->par;
1320 if (par)
1321 fbtft_par_dbg(DEBUG_DRIVER_INIT_FUNCTIONS, par,
1322 "%s()\n", __func__);
1323 fbtft_unregister_framebuffer(info);
1324 fbtft_framebuffer_release(info);
1325 }
1326 EXPORT_SYMBOL(fbtft_remove_common);
1327
1328 MODULE_LICENSE("GPL");
1329