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,void * buf,size_t len,const char * fmt,...)51 void fbtft_dbg_hex(const struct device *dev, int groupsize,
52 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 long index;
331 unsigned int y_low = 0, y_high = 0;
332 int count = 0;
333
334 spin_lock(&par->dirty_lock);
335 dirty_lines_start = par->dirty_lines_start;
336 dirty_lines_end = par->dirty_lines_end;
337 /* set display line markers as clean */
338 par->dirty_lines_start = par->info->var.yres - 1;
339 par->dirty_lines_end = 0;
340 spin_unlock(&par->dirty_lock);
341
342 /* Mark display lines as dirty */
343 list_for_each_entry(pageref, pagereflist, list) {
344 struct page *page = pageref->page;
345 count++;
346 index = page->index << PAGE_SHIFT;
347 y_low = index / info->fix.line_length;
348 y_high = (index + PAGE_SIZE - 1) / info->fix.line_length;
349 dev_dbg(info->device,
350 "page->index=%lu y_low=%d y_high=%d\n",
351 page->index, y_low, y_high);
352 if (y_high > info->var.yres - 1)
353 y_high = info->var.yres - 1;
354 if (y_low < dirty_lines_start)
355 dirty_lines_start = y_low;
356 if (y_high > dirty_lines_end)
357 dirty_lines_end = y_high;
358 }
359
360 par->fbtftops.update_display(info->par,
361 dirty_lines_start, dirty_lines_end);
362 }
363
fbtft_fb_fillrect(struct fb_info * info,const struct fb_fillrect * rect)364 static void fbtft_fb_fillrect(struct fb_info *info,
365 const struct fb_fillrect *rect)
366 {
367 struct fbtft_par *par = info->par;
368
369 dev_dbg(info->dev,
370 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
371 __func__, rect->dx, rect->dy, rect->width, rect->height);
372 sys_fillrect(info, rect);
373
374 par->fbtftops.mkdirty(info, rect->dy, rect->height);
375 }
376
fbtft_fb_copyarea(struct fb_info * info,const struct fb_copyarea * area)377 static void fbtft_fb_copyarea(struct fb_info *info,
378 const struct fb_copyarea *area)
379 {
380 struct fbtft_par *par = info->par;
381
382 dev_dbg(info->dev,
383 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
384 __func__, area->dx, area->dy, area->width, area->height);
385 sys_copyarea(info, area);
386
387 par->fbtftops.mkdirty(info, area->dy, area->height);
388 }
389
fbtft_fb_imageblit(struct fb_info * info,const struct fb_image * image)390 static void fbtft_fb_imageblit(struct fb_info *info,
391 const struct fb_image *image)
392 {
393 struct fbtft_par *par = info->par;
394
395 dev_dbg(info->dev,
396 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
397 __func__, image->dx, image->dy, image->width, image->height);
398 sys_imageblit(info, image);
399
400 par->fbtftops.mkdirty(info, image->dy, image->height);
401 }
402
fbtft_fb_write(struct fb_info * info,const char __user * buf,size_t count,loff_t * ppos)403 static ssize_t fbtft_fb_write(struct fb_info *info, const char __user *buf,
404 size_t count, loff_t *ppos)
405 {
406 struct fbtft_par *par = info->par;
407 ssize_t res;
408
409 dev_dbg(info->dev,
410 "%s: count=%zd, ppos=%llu\n", __func__, count, *ppos);
411 res = fb_sys_write(info, buf, count, ppos);
412
413 /* TODO: only mark changed area update all for now */
414 par->fbtftops.mkdirty(info, -1, 0);
415
416 return res;
417 }
418
419 /* from pxafb.c */
chan_to_field(unsigned int chan,struct fb_bitfield * bf)420 static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
421 {
422 chan &= 0xffff;
423 chan >>= 16 - bf->length;
424 return chan << bf->offset;
425 }
426
fbtft_fb_setcolreg(unsigned int regno,unsigned int red,unsigned int green,unsigned int blue,unsigned int transp,struct fb_info * info)427 static int fbtft_fb_setcolreg(unsigned int regno, unsigned int red,
428 unsigned int green, unsigned int blue,
429 unsigned int transp, struct fb_info *info)
430 {
431 unsigned int val;
432 int ret = 1;
433
434 dev_dbg(info->dev,
435 "%s(regno=%u, red=0x%X, green=0x%X, blue=0x%X, trans=0x%X)\n",
436 __func__, regno, red, green, blue, transp);
437
438 switch (info->fix.visual) {
439 case FB_VISUAL_TRUECOLOR:
440 if (regno < 16) {
441 u32 *pal = info->pseudo_palette;
442
443 val = chan_to_field(red, &info->var.red);
444 val |= chan_to_field(green, &info->var.green);
445 val |= chan_to_field(blue, &info->var.blue);
446
447 pal[regno] = val;
448 ret = 0;
449 }
450 break;
451 }
452 return ret;
453 }
454
fbtft_fb_blank(int blank,struct fb_info * info)455 static int fbtft_fb_blank(int blank, struct fb_info *info)
456 {
457 struct fbtft_par *par = info->par;
458 int ret = -EINVAL;
459
460 dev_dbg(info->dev, "%s(blank=%d)\n",
461 __func__, blank);
462
463 if (!par->fbtftops.blank)
464 return ret;
465
466 switch (blank) {
467 case FB_BLANK_POWERDOWN:
468 case FB_BLANK_VSYNC_SUSPEND:
469 case FB_BLANK_HSYNC_SUSPEND:
470 case FB_BLANK_NORMAL:
471 ret = par->fbtftops.blank(par, true);
472 break;
473 case FB_BLANK_UNBLANK:
474 ret = par->fbtftops.blank(par, false);
475 break;
476 }
477 return ret;
478 }
479
fbtft_merge_fbtftops(struct fbtft_ops * dst,struct fbtft_ops * src)480 static void fbtft_merge_fbtftops(struct fbtft_ops *dst, struct fbtft_ops *src)
481 {
482 if (src->write)
483 dst->write = src->write;
484 if (src->read)
485 dst->read = src->read;
486 if (src->write_vmem)
487 dst->write_vmem = src->write_vmem;
488 if (src->write_register)
489 dst->write_register = src->write_register;
490 if (src->set_addr_win)
491 dst->set_addr_win = src->set_addr_win;
492 if (src->reset)
493 dst->reset = src->reset;
494 if (src->mkdirty)
495 dst->mkdirty = src->mkdirty;
496 if (src->update_display)
497 dst->update_display = src->update_display;
498 if (src->init_display)
499 dst->init_display = src->init_display;
500 if (src->blank)
501 dst->blank = src->blank;
502 if (src->request_gpios_match)
503 dst->request_gpios_match = src->request_gpios_match;
504 if (src->request_gpios)
505 dst->request_gpios = src->request_gpios;
506 if (src->verify_gpios)
507 dst->verify_gpios = src->verify_gpios;
508 if (src->register_backlight)
509 dst->register_backlight = src->register_backlight;
510 if (src->unregister_backlight)
511 dst->unregister_backlight = src->unregister_backlight;
512 if (src->set_var)
513 dst->set_var = src->set_var;
514 if (src->set_gamma)
515 dst->set_gamma = src->set_gamma;
516 }
517
518 /**
519 * fbtft_framebuffer_alloc - creates a new frame buffer info structure
520 *
521 * @display: pointer to structure describing the display
522 * @dev: pointer to the device for this fb, this can be NULL
523 * @pdata: platform data for the display in use
524 *
525 * Creates a new frame buffer info structure.
526 *
527 * Also creates and populates the following structures:
528 * info->fbops
529 * info->fbdefio
530 * info->pseudo_palette
531 * par->fbtftops
532 * par->txbuf
533 *
534 * Returns the new structure, or NULL if an error occurred.
535 *
536 */
fbtft_framebuffer_alloc(struct fbtft_display * display,struct device * dev,struct fbtft_platform_data * pdata)537 struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
538 struct device *dev,
539 struct fbtft_platform_data *pdata)
540 {
541 struct fb_info *info;
542 struct fbtft_par *par;
543 struct fb_ops *fbops = NULL;
544 struct fb_deferred_io *fbdefio = NULL;
545 u8 *vmem = NULL;
546 void *txbuf = NULL;
547 void *buf = NULL;
548 unsigned int width;
549 unsigned int height;
550 int txbuflen = display->txbuflen;
551 unsigned int bpp = display->bpp;
552 unsigned int fps = display->fps;
553 int vmem_size;
554 const s16 *init_sequence = display->init_sequence;
555 char *gamma = display->gamma;
556 u32 *gamma_curves = NULL;
557
558 /* sanity check */
559 if (display->gamma_num * display->gamma_len >
560 FBTFT_GAMMA_MAX_VALUES_TOTAL) {
561 dev_err(dev, "FBTFT_GAMMA_MAX_VALUES_TOTAL=%d is exceeded\n",
562 FBTFT_GAMMA_MAX_VALUES_TOTAL);
563 return NULL;
564 }
565
566 /* defaults */
567 if (!fps)
568 fps = 20;
569 if (!bpp)
570 bpp = 16;
571
572 if (!pdata) {
573 dev_err(dev, "platform data is missing\n");
574 return NULL;
575 }
576
577 /* override driver values? */
578 if (pdata->fps)
579 fps = pdata->fps;
580 if (pdata->txbuflen)
581 txbuflen = pdata->txbuflen;
582 if (pdata->display.init_sequence)
583 init_sequence = pdata->display.init_sequence;
584 if (pdata->gamma)
585 gamma = pdata->gamma;
586 if (pdata->display.debug)
587 display->debug = pdata->display.debug;
588 if (pdata->display.backlight)
589 display->backlight = pdata->display.backlight;
590 if (pdata->display.width)
591 display->width = pdata->display.width;
592 if (pdata->display.height)
593 display->height = pdata->display.height;
594 if (pdata->display.buswidth)
595 display->buswidth = pdata->display.buswidth;
596 if (pdata->display.regwidth)
597 display->regwidth = pdata->display.regwidth;
598
599 display->debug |= debug;
600 fbtft_expand_debug_value(&display->debug);
601
602 switch (pdata->rotate) {
603 case 90:
604 case 270:
605 width = display->height;
606 height = display->width;
607 break;
608 default:
609 width = display->width;
610 height = display->height;
611 }
612
613 vmem_size = display->width * display->height * bpp / 8;
614 vmem = vzalloc(vmem_size);
615 if (!vmem)
616 goto alloc_fail;
617
618 fbops = devm_kzalloc(dev, sizeof(struct fb_ops), GFP_KERNEL);
619 if (!fbops)
620 goto alloc_fail;
621
622 fbdefio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL);
623 if (!fbdefio)
624 goto alloc_fail;
625
626 buf = devm_kzalloc(dev, 128, GFP_KERNEL);
627 if (!buf)
628 goto alloc_fail;
629
630 if (display->gamma_num && display->gamma_len) {
631 gamma_curves = devm_kcalloc(dev,
632 display->gamma_num *
633 display->gamma_len,
634 sizeof(gamma_curves[0]),
635 GFP_KERNEL);
636 if (!gamma_curves)
637 goto alloc_fail;
638 }
639
640 info = framebuffer_alloc(sizeof(struct fbtft_par), dev);
641 if (!info)
642 goto alloc_fail;
643
644 info->screen_buffer = vmem;
645 info->fbops = fbops;
646 info->fbdefio = fbdefio;
647
648 fbops->owner = dev->driver->owner;
649 fbops->fb_read = fb_sys_read;
650 fbops->fb_write = fbtft_fb_write;
651 fbops->fb_fillrect = fbtft_fb_fillrect;
652 fbops->fb_copyarea = fbtft_fb_copyarea;
653 fbops->fb_imageblit = fbtft_fb_imageblit;
654 fbops->fb_setcolreg = fbtft_fb_setcolreg;
655 fbops->fb_blank = fbtft_fb_blank;
656
657 fbdefio->delay = HZ / fps;
658 fbdefio->sort_pagereflist = true;
659 fbdefio->deferred_io = fbtft_deferred_io;
660
661 snprintf(info->fix.id, sizeof(info->fix.id), "%s", dev->driver->name);
662 info->fix.type = FB_TYPE_PACKED_PIXELS;
663 info->fix.visual = FB_VISUAL_TRUECOLOR;
664 info->fix.xpanstep = 0;
665 info->fix.ypanstep = 0;
666 info->fix.ywrapstep = 0;
667 info->fix.line_length = width * bpp / 8;
668 info->fix.accel = FB_ACCEL_NONE;
669 info->fix.smem_len = vmem_size;
670 fb_deferred_io_init(info);
671
672 info->var.rotate = pdata->rotate;
673 info->var.xres = width;
674 info->var.yres = height;
675 info->var.xres_virtual = info->var.xres;
676 info->var.yres_virtual = info->var.yres;
677 info->var.bits_per_pixel = bpp;
678 info->var.nonstd = 1;
679
680 /* RGB565 */
681 info->var.red.offset = 11;
682 info->var.red.length = 5;
683 info->var.green.offset = 5;
684 info->var.green.length = 6;
685 info->var.blue.offset = 0;
686 info->var.blue.length = 5;
687 info->var.transp.offset = 0;
688 info->var.transp.length = 0;
689
690 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
691
692 par = info->par;
693 par->info = info;
694 par->pdata = pdata;
695 par->debug = display->debug;
696 par->buf = buf;
697 spin_lock_init(&par->dirty_lock);
698 par->bgr = pdata->bgr;
699 par->startbyte = pdata->startbyte;
700 par->init_sequence = init_sequence;
701 par->gamma.curves = gamma_curves;
702 par->gamma.num_curves = display->gamma_num;
703 par->gamma.num_values = display->gamma_len;
704 mutex_init(&par->gamma.lock);
705 info->pseudo_palette = par->pseudo_palette;
706
707 if (par->gamma.curves && gamma) {
708 if (fbtft_gamma_parse_str(par, par->gamma.curves, gamma,
709 strlen(gamma)))
710 goto release_framebuf;
711 }
712
713 /* Transmit buffer */
714 if (txbuflen == -1)
715 txbuflen = vmem_size + 2; /* add in case startbyte is used */
716 if (txbuflen >= vmem_size + 2)
717 txbuflen = 0;
718
719 #ifdef __LITTLE_ENDIAN
720 if ((!txbuflen) && (bpp > 8))
721 txbuflen = PAGE_SIZE; /* need buffer for byteswapping */
722 #endif
723
724 if (txbuflen > 0) {
725 txbuf = devm_kzalloc(par->info->device, txbuflen, GFP_KERNEL);
726 if (!txbuf)
727 goto release_framebuf;
728 par->txbuf.buf = txbuf;
729 par->txbuf.len = txbuflen;
730 }
731
732 /* default fbtft operations */
733 par->fbtftops.write = fbtft_write_spi;
734 par->fbtftops.read = fbtft_read_spi;
735 par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
736 par->fbtftops.write_register = fbtft_write_reg8_bus8;
737 par->fbtftops.set_addr_win = fbtft_set_addr_win;
738 par->fbtftops.reset = fbtft_reset;
739 par->fbtftops.mkdirty = fbtft_mkdirty;
740 par->fbtftops.update_display = fbtft_update_display;
741 if (display->backlight)
742 par->fbtftops.register_backlight = fbtft_register_backlight;
743
744 /* use driver provided functions */
745 fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
746
747 return info;
748
749 release_framebuf:
750 framebuffer_release(info);
751
752 alloc_fail:
753 vfree(vmem);
754
755 return NULL;
756 }
757 EXPORT_SYMBOL(fbtft_framebuffer_alloc);
758
759 /**
760 * fbtft_framebuffer_release - frees up all memory used by the framebuffer
761 *
762 * @info: frame buffer info structure
763 *
764 */
fbtft_framebuffer_release(struct fb_info * info)765 void fbtft_framebuffer_release(struct fb_info *info)
766 {
767 fb_deferred_io_cleanup(info);
768 vfree(info->screen_buffer);
769 framebuffer_release(info);
770 }
771 EXPORT_SYMBOL(fbtft_framebuffer_release);
772
773 /**
774 * fbtft_register_framebuffer - registers a tft frame buffer device
775 * @fb_info: frame buffer info structure
776 *
777 * Sets SPI driverdata if needed
778 * Requests needed gpios.
779 * Initializes display
780 * Updates display.
781 * Registers a frame buffer device @fb_info.
782 *
783 * Returns negative errno on error, or zero for success.
784 *
785 */
fbtft_register_framebuffer(struct fb_info * fb_info)786 int fbtft_register_framebuffer(struct fb_info *fb_info)
787 {
788 int ret;
789 char text1[50] = "";
790 char text2[50] = "";
791 struct fbtft_par *par = fb_info->par;
792 struct spi_device *spi = par->spi;
793
794 /* sanity checks */
795 if (!par->fbtftops.init_display) {
796 dev_err(fb_info->device, "missing fbtftops.init_display()\n");
797 return -EINVAL;
798 }
799
800 if (spi)
801 spi_set_drvdata(spi, fb_info);
802 if (par->pdev)
803 platform_set_drvdata(par->pdev, fb_info);
804
805 ret = par->fbtftops.request_gpios(par);
806 if (ret < 0)
807 goto reg_fail;
808
809 if (par->fbtftops.verify_gpios) {
810 ret = par->fbtftops.verify_gpios(par);
811 if (ret < 0)
812 goto reg_fail;
813 }
814
815 ret = par->fbtftops.init_display(par);
816 if (ret < 0)
817 goto reg_fail;
818 if (par->fbtftops.set_var) {
819 ret = par->fbtftops.set_var(par);
820 if (ret < 0)
821 goto reg_fail;
822 }
823
824 /* update the entire display */
825 par->fbtftops.update_display(par, 0, par->info->var.yres - 1);
826
827 if (par->fbtftops.set_gamma && par->gamma.curves) {
828 ret = par->fbtftops.set_gamma(par, par->gamma.curves);
829 if (ret)
830 goto reg_fail;
831 }
832
833 if (par->fbtftops.register_backlight)
834 par->fbtftops.register_backlight(par);
835
836 ret = register_framebuffer(fb_info);
837 if (ret < 0)
838 goto reg_fail;
839
840 fbtft_sysfs_init(par);
841
842 if (par->txbuf.buf && par->txbuf.len >= 1024)
843 sprintf(text1, ", %zu KiB buffer memory", par->txbuf.len >> 10);
844 if (spi)
845 sprintf(text2, ", spi%d.%d at %d MHz", spi->master->bus_num,
846 spi->chip_select, spi->max_speed_hz / 1000000);
847 dev_info(fb_info->dev,
848 "%s frame buffer, %dx%d, %d KiB video memory%s, fps=%lu%s\n",
849 fb_info->fix.id, fb_info->var.xres, fb_info->var.yres,
850 fb_info->fix.smem_len >> 10, text1,
851 HZ / fb_info->fbdefio->delay, text2);
852
853 /* Turn on backlight if available */
854 if (fb_info->bl_dev) {
855 fb_info->bl_dev->props.power = FB_BLANK_UNBLANK;
856 fb_info->bl_dev->ops->update_status(fb_info->bl_dev);
857 }
858
859 return 0;
860
861 reg_fail:
862 if (par->fbtftops.unregister_backlight)
863 par->fbtftops.unregister_backlight(par);
864
865 return ret;
866 }
867 EXPORT_SYMBOL(fbtft_register_framebuffer);
868
869 /**
870 * fbtft_unregister_framebuffer - releases a tft frame buffer device
871 * @fb_info: frame buffer info structure
872 *
873 * Frees SPI driverdata if needed
874 * Frees gpios.
875 * Unregisters frame buffer device.
876 *
877 */
fbtft_unregister_framebuffer(struct fb_info * fb_info)878 int fbtft_unregister_framebuffer(struct fb_info *fb_info)
879 {
880 struct fbtft_par *par = fb_info->par;
881
882 if (par->fbtftops.unregister_backlight)
883 par->fbtftops.unregister_backlight(par);
884 fbtft_sysfs_exit(par);
885 unregister_framebuffer(fb_info);
886
887 return 0;
888 }
889 EXPORT_SYMBOL(fbtft_unregister_framebuffer);
890
891 /**
892 * fbtft_init_display_from_property() - Device Tree init_display() function
893 * @par: Driver data
894 *
895 * Return: 0 if successful, negative if error
896 */
fbtft_init_display_from_property(struct fbtft_par * par)897 static int fbtft_init_display_from_property(struct fbtft_par *par)
898 {
899 struct device *dev = par->info->device;
900 int buf[64], count, index, i, j, ret;
901 u32 *values;
902 u32 val;
903
904 count = device_property_count_u32(dev, "init");
905 if (count < 0)
906 return count;
907 if (count == 0)
908 return -EINVAL;
909
910 values = kmalloc_array(count + 1, sizeof(*values), GFP_KERNEL);
911 if (!values)
912 return -ENOMEM;
913
914 ret = device_property_read_u32_array(dev, "init", values, count);
915 if (ret)
916 goto out_free;
917
918 par->fbtftops.reset(par);
919
920 index = -1;
921 val = values[++index];
922
923 while (index < count) {
924 if (val & FBTFT_OF_INIT_CMD) {
925 val &= 0xFFFF;
926 i = 0;
927 while ((index < count) && !(val & 0xFFFF0000)) {
928 if (i > 63) {
929 dev_err(dev,
930 "%s: Maximum register values exceeded\n",
931 __func__);
932 ret = -EINVAL;
933 goto out_free;
934 }
935 buf[i++] = val;
936 val = values[++index];
937 }
938 /* make debug message */
939 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
940 "init: write_register:\n");
941 for (j = 0; j < i; j++)
942 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
943 "buf[%d] = %02X\n", j, buf[j]);
944
945 par->fbtftops.write_register(par, i,
946 buf[0], buf[1], buf[2], buf[3],
947 buf[4], buf[5], buf[6], buf[7],
948 buf[8], buf[9], buf[10], buf[11],
949 buf[12], buf[13], buf[14], buf[15],
950 buf[16], buf[17], buf[18], buf[19],
951 buf[20], buf[21], buf[22], buf[23],
952 buf[24], buf[25], buf[26], buf[27],
953 buf[28], buf[29], buf[30], buf[31],
954 buf[32], buf[33], buf[34], buf[35],
955 buf[36], buf[37], buf[38], buf[39],
956 buf[40], buf[41], buf[42], buf[43],
957 buf[44], buf[45], buf[46], buf[47],
958 buf[48], buf[49], buf[50], buf[51],
959 buf[52], buf[53], buf[54], buf[55],
960 buf[56], buf[57], buf[58], buf[59],
961 buf[60], buf[61], buf[62], buf[63]);
962 } else if (val & FBTFT_OF_INIT_DELAY) {
963 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
964 "init: msleep(%u)\n", val & 0xFFFF);
965 msleep(val & 0xFFFF);
966 val = values[++index];
967 } else {
968 dev_err(dev, "illegal init value 0x%X\n", val);
969 ret = -EINVAL;
970 goto out_free;
971 }
972 }
973
974 out_free:
975 kfree(values);
976 return ret;
977 }
978
979 /**
980 * fbtft_init_display() - Generic init_display() function
981 * @par: Driver data
982 *
983 * Uses par->init_sequence to do the initialization
984 *
985 * Return: 0 if successful, negative if error
986 */
fbtft_init_display(struct fbtft_par * par)987 int fbtft_init_display(struct fbtft_par *par)
988 {
989 int buf[64];
990 int i;
991 int j;
992
993 /* sanity check */
994 if (!par->init_sequence) {
995 dev_err(par->info->device,
996 "error: init_sequence is not set\n");
997 return -EINVAL;
998 }
999
1000 /* make sure stop marker exists */
1001 for (i = 0; i < FBTFT_MAX_INIT_SEQUENCE; i++) {
1002 if (par->init_sequence[i] == -3)
1003 break;
1004 }
1005
1006 if (i == FBTFT_MAX_INIT_SEQUENCE) {
1007 dev_err(par->info->device,
1008 "missing stop marker at end of init sequence\n");
1009 return -EINVAL;
1010 }
1011
1012 par->fbtftops.reset(par);
1013
1014 i = 0;
1015 while (i < FBTFT_MAX_INIT_SEQUENCE) {
1016 if (par->init_sequence[i] == -3) {
1017 /* done */
1018 return 0;
1019 }
1020 if (par->init_sequence[i] >= 0) {
1021 dev_err(par->info->device,
1022 "missing delimiter at position %d\n", i);
1023 return -EINVAL;
1024 }
1025 if (par->init_sequence[i + 1] < 0) {
1026 dev_err(par->info->device,
1027 "missing value after delimiter %d at position %d\n",
1028 par->init_sequence[i], i);
1029 return -EINVAL;
1030 }
1031 switch (par->init_sequence[i]) {
1032 case -1:
1033 i++;
1034
1035 /* make debug message */
1036 for (j = 0; par->init_sequence[i + 1 + j] >= 0; j++);
1037
1038 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
1039 "init: write(0x%02X) %*ph\n",
1040 par->init_sequence[i], j,
1041 &par->init_sequence[i + 1]);
1042
1043 /* Write */
1044 j = 0;
1045 while (par->init_sequence[i] >= 0) {
1046 if (j > 63) {
1047 dev_err(par->info->device,
1048 "%s: Maximum register values exceeded\n",
1049 __func__);
1050 return -EINVAL;
1051 }
1052 buf[j++] = par->init_sequence[i++];
1053 }
1054 par->fbtftops.write_register(par, j,
1055 buf[0], buf[1], buf[2], buf[3],
1056 buf[4], buf[5], buf[6], buf[7],
1057 buf[8], buf[9], buf[10], buf[11],
1058 buf[12], buf[13], buf[14], buf[15],
1059 buf[16], buf[17], buf[18], buf[19],
1060 buf[20], buf[21], buf[22], buf[23],
1061 buf[24], buf[25], buf[26], buf[27],
1062 buf[28], buf[29], buf[30], buf[31],
1063 buf[32], buf[33], buf[34], buf[35],
1064 buf[36], buf[37], buf[38], buf[39],
1065 buf[40], buf[41], buf[42], buf[43],
1066 buf[44], buf[45], buf[46], buf[47],
1067 buf[48], buf[49], buf[50], buf[51],
1068 buf[52], buf[53], buf[54], buf[55],
1069 buf[56], buf[57], buf[58], buf[59],
1070 buf[60], buf[61], buf[62], buf[63]);
1071 break;
1072 case -2:
1073 i++;
1074 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
1075 "init: mdelay(%d)\n",
1076 par->init_sequence[i]);
1077 mdelay(par->init_sequence[i++]);
1078 break;
1079 default:
1080 dev_err(par->info->device,
1081 "unknown delimiter %d at position %d\n",
1082 par->init_sequence[i], i);
1083 return -EINVAL;
1084 }
1085 }
1086
1087 dev_err(par->info->device,
1088 "%s: something is wrong. Shouldn't get here.\n", __func__);
1089 return -EINVAL;
1090 }
1091 EXPORT_SYMBOL(fbtft_init_display);
1092
1093 /**
1094 * fbtft_verify_gpios() - Generic verify_gpios() function
1095 * @par: Driver data
1096 *
1097 * Uses @spi, @pdev and @buswidth to determine which GPIOs is needed
1098 *
1099 * Return: 0 if successful, negative if error
1100 */
fbtft_verify_gpios(struct fbtft_par * par)1101 static int fbtft_verify_gpios(struct fbtft_par *par)
1102 {
1103 struct fbtft_platform_data *pdata = par->pdata;
1104 int i;
1105
1106 fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);
1107
1108 if (pdata->display.buswidth != 9 && par->startbyte == 0 &&
1109 !par->gpio.dc) {
1110 dev_err(par->info->device,
1111 "Missing info about 'dc' gpio. Aborting.\n");
1112 return -EINVAL;
1113 }
1114
1115 if (!par->pdev)
1116 return 0;
1117
1118 if (!par->gpio.wr) {
1119 dev_err(par->info->device, "Missing 'wr' gpio. Aborting.\n");
1120 return -EINVAL;
1121 }
1122 for (i = 0; i < pdata->display.buswidth; i++) {
1123 if (!par->gpio.db[i]) {
1124 dev_err(par->info->device,
1125 "Missing 'db%02d' gpio. Aborting.\n", i);
1126 return -EINVAL;
1127 }
1128 }
1129
1130 return 0;
1131 }
1132
1133 /* returns 0 if the property is not present */
fbtft_property_value(struct device * dev,const char * propname)1134 static u32 fbtft_property_value(struct device *dev, const char *propname)
1135 {
1136 int ret;
1137 u32 val = 0;
1138
1139 ret = device_property_read_u32(dev, propname, &val);
1140 if (ret == 0)
1141 dev_info(dev, "%s: %s = %u\n", __func__, propname, val);
1142
1143 return val;
1144 }
1145
fbtft_properties_read(struct device * dev)1146 static struct fbtft_platform_data *fbtft_properties_read(struct device *dev)
1147 {
1148 struct fbtft_platform_data *pdata;
1149
1150 if (!dev_fwnode(dev)) {
1151 dev_err(dev, "Missing platform data or properties\n");
1152 return ERR_PTR(-EINVAL);
1153 }
1154
1155 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1156 if (!pdata)
1157 return ERR_PTR(-ENOMEM);
1158
1159 pdata->display.width = fbtft_property_value(dev, "width");
1160 pdata->display.height = fbtft_property_value(dev, "height");
1161 pdata->display.regwidth = fbtft_property_value(dev, "regwidth");
1162 pdata->display.buswidth = fbtft_property_value(dev, "buswidth");
1163 pdata->display.backlight = fbtft_property_value(dev, "backlight");
1164 pdata->display.bpp = fbtft_property_value(dev, "bpp");
1165 pdata->display.debug = fbtft_property_value(dev, "debug");
1166 pdata->rotate = fbtft_property_value(dev, "rotate");
1167 pdata->bgr = device_property_read_bool(dev, "bgr");
1168 pdata->fps = fbtft_property_value(dev, "fps");
1169 pdata->txbuflen = fbtft_property_value(dev, "txbuflen");
1170 pdata->startbyte = fbtft_property_value(dev, "startbyte");
1171 device_property_read_string(dev, "gamma", (const char **)&pdata->gamma);
1172
1173 if (device_property_present(dev, "led-gpios"))
1174 pdata->display.backlight = 1;
1175 if (device_property_present(dev, "init"))
1176 pdata->display.fbtftops.init_display =
1177 fbtft_init_display_from_property;
1178
1179 pdata->display.fbtftops.request_gpios = fbtft_request_gpios;
1180
1181 return pdata;
1182 }
1183
1184 /**
1185 * fbtft_probe_common() - Generic device probe() helper function
1186 * @display: Display properties
1187 * @sdev: SPI device
1188 * @pdev: Platform device
1189 *
1190 * Allocates, initializes and registers a framebuffer
1191 *
1192 * Either @sdev or @pdev should be NULL
1193 *
1194 * Return: 0 if successful, negative if error
1195 */
fbtft_probe_common(struct fbtft_display * display,struct spi_device * sdev,struct platform_device * pdev)1196 int fbtft_probe_common(struct fbtft_display *display,
1197 struct spi_device *sdev,
1198 struct platform_device *pdev)
1199 {
1200 struct device *dev;
1201 struct fb_info *info;
1202 struct fbtft_par *par;
1203 struct fbtft_platform_data *pdata;
1204 int ret;
1205
1206 if (sdev)
1207 dev = &sdev->dev;
1208 else
1209 dev = &pdev->dev;
1210
1211 if (unlikely(display->debug & DEBUG_DRIVER_INIT_FUNCTIONS))
1212 dev_info(dev, "%s()\n", __func__);
1213
1214 pdata = dev->platform_data;
1215 if (!pdata) {
1216 pdata = fbtft_properties_read(dev);
1217 if (IS_ERR(pdata))
1218 return PTR_ERR(pdata);
1219 }
1220
1221 info = fbtft_framebuffer_alloc(display, dev, pdata);
1222 if (!info)
1223 return -ENOMEM;
1224
1225 par = info->par;
1226 par->spi = sdev;
1227 par->pdev = pdev;
1228
1229 if (display->buswidth == 0) {
1230 dev_err(dev, "buswidth is not set\n");
1231 return -EINVAL;
1232 }
1233
1234 /* write register functions */
1235 if (display->regwidth == 8 && display->buswidth == 8)
1236 par->fbtftops.write_register = fbtft_write_reg8_bus8;
1237 else if (display->regwidth == 8 && display->buswidth == 9 && par->spi)
1238 par->fbtftops.write_register = fbtft_write_reg8_bus9;
1239 else if (display->regwidth == 16 && display->buswidth == 8)
1240 par->fbtftops.write_register = fbtft_write_reg16_bus8;
1241 else if (display->regwidth == 16 && display->buswidth == 16)
1242 par->fbtftops.write_register = fbtft_write_reg16_bus16;
1243 else
1244 dev_warn(dev,
1245 "no default functions for regwidth=%d and buswidth=%d\n",
1246 display->regwidth, display->buswidth);
1247
1248 /* write_vmem() functions */
1249 if (display->buswidth == 8)
1250 par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
1251 else if (display->buswidth == 9)
1252 par->fbtftops.write_vmem = fbtft_write_vmem16_bus9;
1253 else if (display->buswidth == 16)
1254 par->fbtftops.write_vmem = fbtft_write_vmem16_bus16;
1255
1256 /* GPIO write() functions */
1257 if (par->pdev) {
1258 if (display->buswidth == 8)
1259 par->fbtftops.write = fbtft_write_gpio8_wr;
1260 else if (display->buswidth == 16)
1261 par->fbtftops.write = fbtft_write_gpio16_wr;
1262 }
1263
1264 /* 9-bit SPI setup */
1265 if (par->spi && display->buswidth == 9) {
1266 if (par->spi->master->bits_per_word_mask & SPI_BPW_MASK(9)) {
1267 par->spi->bits_per_word = 9;
1268 } else {
1269 dev_warn(&par->spi->dev,
1270 "9-bit SPI not available, emulating using 8-bit.\n");
1271 /* allocate buffer with room for dc bits */
1272 par->extra = devm_kzalloc(par->info->device,
1273 par->txbuf.len +
1274 (par->txbuf.len / 8) + 8,
1275 GFP_KERNEL);
1276 if (!par->extra) {
1277 ret = -ENOMEM;
1278 goto out_release;
1279 }
1280 par->fbtftops.write = fbtft_write_spi_emulate_9;
1281 }
1282 }
1283
1284 if (!par->fbtftops.verify_gpios)
1285 par->fbtftops.verify_gpios = fbtft_verify_gpios;
1286
1287 /* make sure we still use the driver provided functions */
1288 fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
1289
1290 /* use init_sequence if provided */
1291 if (par->init_sequence)
1292 par->fbtftops.init_display = fbtft_init_display;
1293
1294 /* use platform_data provided functions above all */
1295 fbtft_merge_fbtftops(&par->fbtftops, &pdata->display.fbtftops);
1296
1297 ret = fbtft_register_framebuffer(info);
1298 if (ret < 0)
1299 goto out_release;
1300
1301 return 0;
1302
1303 out_release:
1304 fbtft_framebuffer_release(info);
1305
1306 return ret;
1307 }
1308 EXPORT_SYMBOL(fbtft_probe_common);
1309
1310 /**
1311 * fbtft_remove_common() - Generic device remove() helper function
1312 * @dev: Device
1313 * @info: Framebuffer
1314 *
1315 * Unregisters and releases the framebuffer
1316 *
1317 * Return: 0 if successful, negative if error
1318 */
fbtft_remove_common(struct device * dev,struct fb_info * info)1319 int fbtft_remove_common(struct device *dev, struct fb_info *info)
1320 {
1321 struct fbtft_par *par;
1322
1323 if (!info)
1324 return -EINVAL;
1325 par = info->par;
1326 if (par)
1327 fbtft_par_dbg(DEBUG_DRIVER_INIT_FUNCTIONS, par,
1328 "%s()\n", __func__);
1329 fbtft_unregister_framebuffer(info);
1330 fbtft_framebuffer_release(info);
1331
1332 return 0;
1333 }
1334 EXPORT_SYMBOL(fbtft_remove_common);
1335
1336 MODULE_LICENSE("GPL");
1337