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/spinlock.h>
26 #include <linux/of.h>
27 #include <video/mipi_display.h>
28
29 #include "fbtft.h"
30 #include "internal.h"
31
32 static unsigned long debug;
33 module_param(debug, ulong, 0000);
34 MODULE_PARM_DESC(debug, "override device debug level");
35
fbtft_write_buf_dc(struct fbtft_par * par,void * buf,size_t len,int dc)36 int fbtft_write_buf_dc(struct fbtft_par *par, void *buf, size_t len, int dc)
37 {
38 int ret;
39
40 if (par->gpio.dc)
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
73 #ifdef CONFIG_OF
fbtft_request_one_gpio(struct fbtft_par * par,const char * name,int index,struct gpio_desc ** gpiop)74 static int fbtft_request_one_gpio(struct fbtft_par *par,
75 const char *name, int index,
76 struct gpio_desc **gpiop)
77 {
78 struct device *dev = par->info->device;
79 int ret = 0;
80
81 *gpiop = devm_gpiod_get_index_optional(dev, name, index,
82 GPIOD_OUT_HIGH);
83 if (IS_ERR(*gpiop)) {
84 ret = PTR_ERR(*gpiop);
85 dev_err(dev,
86 "Failed to request %s GPIO: %d\n", name, ret);
87 return ret;
88 }
89 fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' GPIO\n",
90 __func__, name);
91
92 return ret;
93 }
94
fbtft_request_gpios_dt(struct fbtft_par * par)95 static int fbtft_request_gpios_dt(struct fbtft_par *par)
96 {
97 int i;
98 int ret;
99
100 if (!par->info->device->of_node)
101 return -EINVAL;
102
103 ret = fbtft_request_one_gpio(par, "reset", 0, &par->gpio.reset);
104 if (ret)
105 return ret;
106 ret = fbtft_request_one_gpio(par, "dc", 0, &par->gpio.dc);
107 if (ret)
108 return ret;
109 ret = fbtft_request_one_gpio(par, "rd", 0, &par->gpio.rd);
110 if (ret)
111 return ret;
112 ret = fbtft_request_one_gpio(par, "wr", 0, &par->gpio.wr);
113 if (ret)
114 return ret;
115 ret = fbtft_request_one_gpio(par, "cs", 0, &par->gpio.cs);
116 if (ret)
117 return ret;
118 ret = fbtft_request_one_gpio(par, "latch", 0, &par->gpio.latch);
119 if (ret)
120 return ret;
121 for (i = 0; i < 16; i++) {
122 ret = fbtft_request_one_gpio(par, "db", i,
123 &par->gpio.db[i]);
124 if (ret)
125 return ret;
126 ret = fbtft_request_one_gpio(par, "led", i,
127 &par->gpio.led[i]);
128 if (ret)
129 return ret;
130 ret = fbtft_request_one_gpio(par, "aux", i,
131 &par->gpio.aux[i]);
132 if (ret)
133 return ret;
134 }
135
136 return 0;
137 }
138 #endif
139
140 #ifdef CONFIG_FB_BACKLIGHT
fbtft_backlight_update_status(struct backlight_device * bd)141 static int fbtft_backlight_update_status(struct backlight_device *bd)
142 {
143 struct fbtft_par *par = bl_get_data(bd);
144 bool polarity = par->polarity;
145
146 fbtft_par_dbg(DEBUG_BACKLIGHT, par,
147 "%s: polarity=%d, power=%d, fb_blank=%d\n",
148 __func__, polarity, bd->props.power, bd->props.fb_blank);
149
150 if ((bd->props.power == FB_BLANK_UNBLANK) &&
151 (bd->props.fb_blank == FB_BLANK_UNBLANK))
152 gpiod_set_value(par->gpio.led[0], polarity);
153 else
154 gpiod_set_value(par->gpio.led[0], !polarity);
155
156 return 0;
157 }
158
fbtft_backlight_get_brightness(struct backlight_device * bd)159 static int fbtft_backlight_get_brightness(struct backlight_device *bd)
160 {
161 return bd->props.brightness;
162 }
163
fbtft_unregister_backlight(struct fbtft_par * par)164 void fbtft_unregister_backlight(struct fbtft_par *par)
165 {
166 if (par->info->bl_dev) {
167 par->info->bl_dev->props.power = FB_BLANK_POWERDOWN;
168 backlight_update_status(par->info->bl_dev);
169 backlight_device_unregister(par->info->bl_dev);
170 par->info->bl_dev = NULL;
171 }
172 }
173
174 static const struct backlight_ops fbtft_bl_ops = {
175 .get_brightness = fbtft_backlight_get_brightness,
176 .update_status = fbtft_backlight_update_status,
177 };
178
fbtft_register_backlight(struct fbtft_par * par)179 void fbtft_register_backlight(struct fbtft_par *par)
180 {
181 struct backlight_device *bd;
182 struct backlight_properties bl_props = { 0, };
183
184 if (!par->gpio.led[0]) {
185 fbtft_par_dbg(DEBUG_BACKLIGHT, par,
186 "%s(): led pin not set, exiting.\n", __func__);
187 return;
188 }
189
190 bl_props.type = BACKLIGHT_RAW;
191 /* Assume backlight is off, get polarity from current state of pin */
192 bl_props.power = FB_BLANK_POWERDOWN;
193 if (!gpiod_get_value(par->gpio.led[0]))
194 par->polarity = true;
195
196 bd = backlight_device_register(dev_driver_string(par->info->device),
197 par->info->device, par,
198 &fbtft_bl_ops, &bl_props);
199 if (IS_ERR(bd)) {
200 dev_err(par->info->device,
201 "cannot register backlight device (%ld)\n",
202 PTR_ERR(bd));
203 return;
204 }
205 par->info->bl_dev = bd;
206
207 if (!par->fbtftops.unregister_backlight)
208 par->fbtftops.unregister_backlight = fbtft_unregister_backlight;
209 }
210 #else
fbtft_register_backlight(struct fbtft_par * par)211 void fbtft_register_backlight(struct fbtft_par *par) { };
fbtft_unregister_backlight(struct fbtft_par * par)212 void fbtft_unregister_backlight(struct fbtft_par *par) { };
213 #endif
214 EXPORT_SYMBOL(fbtft_register_backlight);
215 EXPORT_SYMBOL(fbtft_unregister_backlight);
216
fbtft_set_addr_win(struct fbtft_par * par,int xs,int ys,int xe,int ye)217 static void fbtft_set_addr_win(struct fbtft_par *par, int xs, int ys, int xe,
218 int ye)
219 {
220 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
221 (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
222
223 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
224 (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
225
226 write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
227 }
228
fbtft_reset(struct fbtft_par * par)229 static void fbtft_reset(struct fbtft_par *par)
230 {
231 if (!par->gpio.reset)
232 return;
233 fbtft_par_dbg(DEBUG_RESET, par, "%s()\n", __func__);
234 gpiod_set_value_cansleep(par->gpio.reset, 1);
235 usleep_range(20, 40);
236 gpiod_set_value_cansleep(par->gpio.reset, 0);
237 msleep(120);
238 }
239
fbtft_update_display(struct fbtft_par * par,unsigned int start_line,unsigned int end_line)240 static void fbtft_update_display(struct fbtft_par *par, unsigned int start_line,
241 unsigned int end_line)
242 {
243 size_t offset, len;
244 ktime_t ts_start, ts_end;
245 long fps, throughput;
246 bool timeit = false;
247 int ret = 0;
248
249 if (unlikely(par->debug & (DEBUG_TIME_FIRST_UPDATE |
250 DEBUG_TIME_EACH_UPDATE))) {
251 if ((par->debug & DEBUG_TIME_EACH_UPDATE) ||
252 ((par->debug & DEBUG_TIME_FIRST_UPDATE) &&
253 !par->first_update_done)) {
254 ts_start = ktime_get();
255 timeit = true;
256 }
257 }
258
259 /* Sanity checks */
260 if (start_line > end_line) {
261 dev_warn(par->info->device,
262 "%s: start_line=%u is larger than end_line=%u. Shouldn't happen, will do full display update\n",
263 __func__, start_line, end_line);
264 start_line = 0;
265 end_line = par->info->var.yres - 1;
266 }
267 if (start_line > par->info->var.yres - 1 ||
268 end_line > par->info->var.yres - 1) {
269 dev_warn(par->info->device,
270 "%s: start_line=%u or end_line=%u is larger than max=%d. Shouldn't happen, will do full display update\n",
271 __func__, start_line,
272 end_line, par->info->var.yres - 1);
273 start_line = 0;
274 end_line = par->info->var.yres - 1;
275 }
276
277 fbtft_par_dbg(DEBUG_UPDATE_DISPLAY, par, "%s(start_line=%u, end_line=%u)\n",
278 __func__, start_line, end_line);
279
280 if (par->fbtftops.set_addr_win)
281 par->fbtftops.set_addr_win(par, 0, start_line,
282 par->info->var.xres - 1, end_line);
283
284 offset = start_line * par->info->fix.line_length;
285 len = (end_line - start_line + 1) * par->info->fix.line_length;
286 ret = par->fbtftops.write_vmem(par, offset, len);
287 if (ret < 0)
288 dev_err(par->info->device,
289 "%s: write_vmem failed to update display buffer\n",
290 __func__);
291
292 if (unlikely(timeit)) {
293 ts_end = ktime_get();
294 if (!ktime_to_ns(par->update_time))
295 par->update_time = ts_start;
296
297 fps = ktime_us_delta(ts_start, par->update_time);
298 par->update_time = ts_start;
299 fps = fps ? 1000000 / fps : 0;
300
301 throughput = ktime_us_delta(ts_end, ts_start);
302 throughput = throughput ? (len * 1000) / throughput : 0;
303 throughput = throughput * 1000 / 1024;
304
305 dev_info(par->info->device,
306 "Display update: %ld kB/s, fps=%ld\n",
307 throughput, fps);
308 par->first_update_done = true;
309 }
310 }
311
fbtft_mkdirty(struct fb_info * info,int y,int height)312 static void fbtft_mkdirty(struct fb_info *info, int y, int height)
313 {
314 struct fbtft_par *par = info->par;
315 struct fb_deferred_io *fbdefio = info->fbdefio;
316
317 /* special case, needed ? */
318 if (y == -1) {
319 y = 0;
320 height = info->var.yres - 1;
321 }
322
323 /* Mark display lines/area as dirty */
324 spin_lock(&par->dirty_lock);
325 if (y < par->dirty_lines_start)
326 par->dirty_lines_start = y;
327 if (y + height - 1 > par->dirty_lines_end)
328 par->dirty_lines_end = y + height - 1;
329 spin_unlock(&par->dirty_lock);
330
331 /* Schedule deferred_io to update display (no-op if already on queue)*/
332 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
333 }
334
fbtft_deferred_io(struct fb_info * info,struct list_head * pagelist)335 static void fbtft_deferred_io(struct fb_info *info, struct list_head *pagelist)
336 {
337 struct fbtft_par *par = info->par;
338 unsigned int dirty_lines_start, dirty_lines_end;
339 struct page *page;
340 unsigned long index;
341 unsigned int y_low = 0, y_high = 0;
342 int count = 0;
343
344 spin_lock(&par->dirty_lock);
345 dirty_lines_start = par->dirty_lines_start;
346 dirty_lines_end = par->dirty_lines_end;
347 /* set display line markers as clean */
348 par->dirty_lines_start = par->info->var.yres - 1;
349 par->dirty_lines_end = 0;
350 spin_unlock(&par->dirty_lock);
351
352 /* Mark display lines as dirty */
353 list_for_each_entry(page, pagelist, lru) {
354 count++;
355 index = page->index << PAGE_SHIFT;
356 y_low = index / info->fix.line_length;
357 y_high = (index + PAGE_SIZE - 1) / info->fix.line_length;
358 dev_dbg(info->device,
359 "page->index=%lu y_low=%d y_high=%d\n",
360 page->index, y_low, y_high);
361 if (y_high > info->var.yres - 1)
362 y_high = info->var.yres - 1;
363 if (y_low < dirty_lines_start)
364 dirty_lines_start = y_low;
365 if (y_high > dirty_lines_end)
366 dirty_lines_end = y_high;
367 }
368
369 par->fbtftops.update_display(info->par,
370 dirty_lines_start, dirty_lines_end);
371 }
372
fbtft_fb_fillrect(struct fb_info * info,const struct fb_fillrect * rect)373 static void fbtft_fb_fillrect(struct fb_info *info,
374 const struct fb_fillrect *rect)
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__, rect->dx, rect->dy, rect->width, rect->height);
381 sys_fillrect(info, rect);
382
383 par->fbtftops.mkdirty(info, rect->dy, rect->height);
384 }
385
fbtft_fb_copyarea(struct fb_info * info,const struct fb_copyarea * area)386 static void fbtft_fb_copyarea(struct fb_info *info,
387 const struct fb_copyarea *area)
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__, area->dx, area->dy, area->width, area->height);
394 sys_copyarea(info, area);
395
396 par->fbtftops.mkdirty(info, area->dy, area->height);
397 }
398
fbtft_fb_imageblit(struct fb_info * info,const struct fb_image * image)399 static void fbtft_fb_imageblit(struct fb_info *info,
400 const struct fb_image *image)
401 {
402 struct fbtft_par *par = info->par;
403
404 dev_dbg(info->dev,
405 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
406 __func__, image->dx, image->dy, image->width, image->height);
407 sys_imageblit(info, image);
408
409 par->fbtftops.mkdirty(info, image->dy, image->height);
410 }
411
fbtft_fb_write(struct fb_info * info,const char __user * buf,size_t count,loff_t * ppos)412 static ssize_t fbtft_fb_write(struct fb_info *info, const char __user *buf,
413 size_t count, loff_t *ppos)
414 {
415 struct fbtft_par *par = info->par;
416 ssize_t res;
417
418 dev_dbg(info->dev,
419 "%s: count=%zd, ppos=%llu\n", __func__, count, *ppos);
420 res = fb_sys_write(info, buf, count, ppos);
421
422 /* TODO: only mark changed area update all for now */
423 par->fbtftops.mkdirty(info, -1, 0);
424
425 return res;
426 }
427
428 /* from pxafb.c */
chan_to_field(unsigned int chan,struct fb_bitfield * bf)429 static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
430 {
431 chan &= 0xffff;
432 chan >>= 16 - bf->length;
433 return chan << bf->offset;
434 }
435
fbtft_fb_setcolreg(unsigned int regno,unsigned int red,unsigned int green,unsigned int blue,unsigned int transp,struct fb_info * info)436 static int fbtft_fb_setcolreg(unsigned int regno, unsigned int red,
437 unsigned int green, unsigned int blue,
438 unsigned int transp, struct fb_info *info)
439 {
440 unsigned int val;
441 int ret = 1;
442
443 dev_dbg(info->dev,
444 "%s(regno=%u, red=0x%X, green=0x%X, blue=0x%X, trans=0x%X)\n",
445 __func__, regno, red, green, blue, transp);
446
447 switch (info->fix.visual) {
448 case FB_VISUAL_TRUECOLOR:
449 if (regno < 16) {
450 u32 *pal = info->pseudo_palette;
451
452 val = chan_to_field(red, &info->var.red);
453 val |= chan_to_field(green, &info->var.green);
454 val |= chan_to_field(blue, &info->var.blue);
455
456 pal[regno] = val;
457 ret = 0;
458 }
459 break;
460 }
461 return ret;
462 }
463
fbtft_fb_blank(int blank,struct fb_info * info)464 static int fbtft_fb_blank(int blank, struct fb_info *info)
465 {
466 struct fbtft_par *par = info->par;
467 int ret = -EINVAL;
468
469 dev_dbg(info->dev, "%s(blank=%d)\n",
470 __func__, blank);
471
472 if (!par->fbtftops.blank)
473 return ret;
474
475 switch (blank) {
476 case FB_BLANK_POWERDOWN:
477 case FB_BLANK_VSYNC_SUSPEND:
478 case FB_BLANK_HSYNC_SUSPEND:
479 case FB_BLANK_NORMAL:
480 ret = par->fbtftops.blank(par, true);
481 break;
482 case FB_BLANK_UNBLANK:
483 ret = par->fbtftops.blank(par, false);
484 break;
485 }
486 return ret;
487 }
488
fbtft_merge_fbtftops(struct fbtft_ops * dst,struct fbtft_ops * src)489 static void fbtft_merge_fbtftops(struct fbtft_ops *dst, struct fbtft_ops *src)
490 {
491 if (src->write)
492 dst->write = src->write;
493 if (src->read)
494 dst->read = src->read;
495 if (src->write_vmem)
496 dst->write_vmem = src->write_vmem;
497 if (src->write_register)
498 dst->write_register = src->write_register;
499 if (src->set_addr_win)
500 dst->set_addr_win = src->set_addr_win;
501 if (src->reset)
502 dst->reset = src->reset;
503 if (src->mkdirty)
504 dst->mkdirty = src->mkdirty;
505 if (src->update_display)
506 dst->update_display = src->update_display;
507 if (src->init_display)
508 dst->init_display = src->init_display;
509 if (src->blank)
510 dst->blank = src->blank;
511 if (src->request_gpios_match)
512 dst->request_gpios_match = src->request_gpios_match;
513 if (src->request_gpios)
514 dst->request_gpios = src->request_gpios;
515 if (src->verify_gpios)
516 dst->verify_gpios = src->verify_gpios;
517 if (src->register_backlight)
518 dst->register_backlight = src->register_backlight;
519 if (src->unregister_backlight)
520 dst->unregister_backlight = src->unregister_backlight;
521 if (src->set_var)
522 dst->set_var = src->set_var;
523 if (src->set_gamma)
524 dst->set_gamma = src->set_gamma;
525 }
526
527 /**
528 * fbtft_framebuffer_alloc - creates a new frame buffer info structure
529 *
530 * @display: pointer to structure describing the display
531 * @dev: pointer to the device for this fb, this can be NULL
532 *
533 * Creates a new frame buffer info structure.
534 *
535 * Also creates and populates the following structures:
536 * info->fbops
537 * info->fbdefio
538 * info->pseudo_palette
539 * par->fbtftops
540 * par->txbuf
541 *
542 * Returns the new structure, or NULL if an error occurred.
543 *
544 */
fbtft_framebuffer_alloc(struct fbtft_display * display,struct device * dev,struct fbtft_platform_data * pdata)545 struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
546 struct device *dev,
547 struct fbtft_platform_data *pdata)
548 {
549 struct fb_info *info;
550 struct fbtft_par *par;
551 struct fb_ops *fbops = NULL;
552 struct fb_deferred_io *fbdefio = NULL;
553 u8 *vmem = NULL;
554 void *txbuf = NULL;
555 void *buf = NULL;
556 unsigned int width;
557 unsigned int height;
558 int txbuflen = display->txbuflen;
559 unsigned int bpp = display->bpp;
560 unsigned int fps = display->fps;
561 int vmem_size;
562 const s16 *init_sequence = display->init_sequence;
563 char *gamma = display->gamma;
564 u32 *gamma_curves = NULL;
565
566 /* sanity check */
567 if (display->gamma_num * display->gamma_len >
568 FBTFT_GAMMA_MAX_VALUES_TOTAL) {
569 dev_err(dev, "FBTFT_GAMMA_MAX_VALUES_TOTAL=%d is exceeded\n",
570 FBTFT_GAMMA_MAX_VALUES_TOTAL);
571 return NULL;
572 }
573
574 /* defaults */
575 if (!fps)
576 fps = 20;
577 if (!bpp)
578 bpp = 16;
579
580 if (!pdata) {
581 dev_err(dev, "platform data is missing\n");
582 return NULL;
583 }
584
585 /* override driver values? */
586 if (pdata->fps)
587 fps = pdata->fps;
588 if (pdata->txbuflen)
589 txbuflen = pdata->txbuflen;
590 if (pdata->display.init_sequence)
591 init_sequence = pdata->display.init_sequence;
592 if (pdata->gamma)
593 gamma = pdata->gamma;
594 if (pdata->display.debug)
595 display->debug = pdata->display.debug;
596 if (pdata->display.backlight)
597 display->backlight = pdata->display.backlight;
598 if (pdata->display.width)
599 display->width = pdata->display.width;
600 if (pdata->display.height)
601 display->height = pdata->display.height;
602 if (pdata->display.buswidth)
603 display->buswidth = pdata->display.buswidth;
604 if (pdata->display.regwidth)
605 display->regwidth = pdata->display.regwidth;
606
607 display->debug |= debug;
608 fbtft_expand_debug_value(&display->debug);
609
610 switch (pdata->rotate) {
611 case 90:
612 case 270:
613 width = display->height;
614 height = display->width;
615 break;
616 default:
617 width = display->width;
618 height = display->height;
619 }
620
621 vmem_size = display->width * display->height * bpp / 8;
622 vmem = vzalloc(vmem_size);
623 if (!vmem)
624 goto alloc_fail;
625
626 fbops = devm_kzalloc(dev, sizeof(struct fb_ops), GFP_KERNEL);
627 if (!fbops)
628 goto alloc_fail;
629
630 fbdefio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL);
631 if (!fbdefio)
632 goto alloc_fail;
633
634 buf = devm_kzalloc(dev, 128, GFP_KERNEL);
635 if (!buf)
636 goto alloc_fail;
637
638 if (display->gamma_num && display->gamma_len) {
639 gamma_curves = devm_kcalloc(dev,
640 display->gamma_num *
641 display->gamma_len,
642 sizeof(gamma_curves[0]),
643 GFP_KERNEL);
644 if (!gamma_curves)
645 goto alloc_fail;
646 }
647
648 info = framebuffer_alloc(sizeof(struct fbtft_par), dev);
649 if (!info)
650 goto alloc_fail;
651
652 info->screen_buffer = vmem;
653 info->fbops = fbops;
654 info->fbdefio = fbdefio;
655
656 fbops->owner = dev->driver->owner;
657 fbops->fb_read = fb_sys_read;
658 fbops->fb_write = fbtft_fb_write;
659 fbops->fb_fillrect = fbtft_fb_fillrect;
660 fbops->fb_copyarea = fbtft_fb_copyarea;
661 fbops->fb_imageblit = fbtft_fb_imageblit;
662 fbops->fb_setcolreg = fbtft_fb_setcolreg;
663 fbops->fb_blank = fbtft_fb_blank;
664
665 fbdefio->delay = HZ / fps;
666 fbdefio->deferred_io = fbtft_deferred_io;
667 fb_deferred_io_init(info);
668
669 snprintf(info->fix.id, sizeof(info->fix.id), "%s", dev->driver->name);
670 info->fix.type = FB_TYPE_PACKED_PIXELS;
671 info->fix.visual = FB_VISUAL_TRUECOLOR;
672 info->fix.xpanstep = 0;
673 info->fix.ypanstep = 0;
674 info->fix.ywrapstep = 0;
675 info->fix.line_length = width * bpp / 8;
676 info->fix.accel = FB_ACCEL_NONE;
677 info->fix.smem_len = vmem_size;
678
679 info->var.rotate = pdata->rotate;
680 info->var.xres = width;
681 info->var.yres = height;
682 info->var.xres_virtual = info->var.xres;
683 info->var.yres_virtual = info->var.yres;
684 info->var.bits_per_pixel = bpp;
685 info->var.nonstd = 1;
686
687 /* RGB565 */
688 info->var.red.offset = 11;
689 info->var.red.length = 5;
690 info->var.green.offset = 5;
691 info->var.green.length = 6;
692 info->var.blue.offset = 0;
693 info->var.blue.length = 5;
694 info->var.transp.offset = 0;
695 info->var.transp.length = 0;
696
697 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
698
699 par = info->par;
700 par->info = info;
701 par->pdata = pdata;
702 par->debug = display->debug;
703 par->buf = buf;
704 spin_lock_init(&par->dirty_lock);
705 par->bgr = pdata->bgr;
706 par->startbyte = pdata->startbyte;
707 par->init_sequence = init_sequence;
708 par->gamma.curves = gamma_curves;
709 par->gamma.num_curves = display->gamma_num;
710 par->gamma.num_values = display->gamma_len;
711 mutex_init(&par->gamma.lock);
712 info->pseudo_palette = par->pseudo_palette;
713
714 if (par->gamma.curves && gamma) {
715 if (fbtft_gamma_parse_str(par, par->gamma.curves, gamma,
716 strlen(gamma)))
717 goto release_framebuf;
718 }
719
720 /* Transmit buffer */
721 if (txbuflen == -1)
722 txbuflen = vmem_size + 2; /* add in case startbyte is used */
723 if (txbuflen >= vmem_size + 2)
724 txbuflen = 0;
725
726 #ifdef __LITTLE_ENDIAN
727 if ((!txbuflen) && (bpp > 8))
728 txbuflen = PAGE_SIZE; /* need buffer for byteswapping */
729 #endif
730
731 if (txbuflen > 0) {
732 txbuf = devm_kzalloc(par->info->device, txbuflen, GFP_KERNEL);
733 if (!txbuf)
734 goto release_framebuf;
735 par->txbuf.buf = txbuf;
736 par->txbuf.len = txbuflen;
737 }
738
739 /* default fbtft operations */
740 par->fbtftops.write = fbtft_write_spi;
741 par->fbtftops.read = fbtft_read_spi;
742 par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
743 par->fbtftops.write_register = fbtft_write_reg8_bus8;
744 par->fbtftops.set_addr_win = fbtft_set_addr_win;
745 par->fbtftops.reset = fbtft_reset;
746 par->fbtftops.mkdirty = fbtft_mkdirty;
747 par->fbtftops.update_display = fbtft_update_display;
748 if (display->backlight)
749 par->fbtftops.register_backlight = fbtft_register_backlight;
750
751 /* use driver provided functions */
752 fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
753
754 return info;
755
756 release_framebuf:
757 framebuffer_release(info);
758
759 alloc_fail:
760 vfree(vmem);
761
762 return NULL;
763 }
764 EXPORT_SYMBOL(fbtft_framebuffer_alloc);
765
766 /**
767 * fbtft_framebuffer_release - frees up all memory used by the framebuffer
768 *
769 * @info: frame buffer info structure
770 *
771 */
fbtft_framebuffer_release(struct fb_info * info)772 void fbtft_framebuffer_release(struct fb_info *info)
773 {
774 fb_deferred_io_cleanup(info);
775 vfree(info->screen_buffer);
776 framebuffer_release(info);
777 }
778 EXPORT_SYMBOL(fbtft_framebuffer_release);
779
780 /**
781 * fbtft_register_framebuffer - registers a tft frame buffer device
782 * @fb_info: frame buffer info structure
783 *
784 * Sets SPI driverdata if needed
785 * Requests needed gpios.
786 * Initializes display
787 * Updates display.
788 * Registers a frame buffer device @fb_info.
789 *
790 * Returns negative errno on error, or zero for success.
791 *
792 */
fbtft_register_framebuffer(struct fb_info * fb_info)793 int fbtft_register_framebuffer(struct fb_info *fb_info)
794 {
795 int ret;
796 char text1[50] = "";
797 char text2[50] = "";
798 struct fbtft_par *par = fb_info->par;
799 struct spi_device *spi = par->spi;
800
801 /* sanity checks */
802 if (!par->fbtftops.init_display) {
803 dev_err(fb_info->device, "missing fbtftops.init_display()\n");
804 return -EINVAL;
805 }
806
807 if (spi)
808 spi_set_drvdata(spi, fb_info);
809 if (par->pdev)
810 platform_set_drvdata(par->pdev, fb_info);
811
812 ret = par->fbtftops.request_gpios(par);
813 if (ret < 0)
814 goto reg_fail;
815
816 if (par->fbtftops.verify_gpios) {
817 ret = par->fbtftops.verify_gpios(par);
818 if (ret < 0)
819 goto reg_fail;
820 }
821
822 ret = par->fbtftops.init_display(par);
823 if (ret < 0)
824 goto reg_fail;
825 if (par->fbtftops.set_var) {
826 ret = par->fbtftops.set_var(par);
827 if (ret < 0)
828 goto reg_fail;
829 }
830
831 /* update the entire display */
832 par->fbtftops.update_display(par, 0, par->info->var.yres - 1);
833
834 if (par->fbtftops.set_gamma && par->gamma.curves) {
835 ret = par->fbtftops.set_gamma(par, par->gamma.curves);
836 if (ret)
837 goto reg_fail;
838 }
839
840 if (par->fbtftops.register_backlight)
841 par->fbtftops.register_backlight(par);
842
843 ret = register_framebuffer(fb_info);
844 if (ret < 0)
845 goto reg_fail;
846
847 fbtft_sysfs_init(par);
848
849 if (par->txbuf.buf && par->txbuf.len >= 1024)
850 sprintf(text1, ", %zu KiB buffer memory", par->txbuf.len >> 10);
851 if (spi)
852 sprintf(text2, ", spi%d.%d at %d MHz", spi->master->bus_num,
853 spi->chip_select, spi->max_speed_hz / 1000000);
854 dev_info(fb_info->dev,
855 "%s frame buffer, %dx%d, %d KiB video memory%s, fps=%lu%s\n",
856 fb_info->fix.id, fb_info->var.xres, fb_info->var.yres,
857 fb_info->fix.smem_len >> 10, text1,
858 HZ / fb_info->fbdefio->delay, text2);
859
860 #ifdef CONFIG_FB_BACKLIGHT
861 /* Turn on backlight if available */
862 if (fb_info->bl_dev) {
863 fb_info->bl_dev->props.power = FB_BLANK_UNBLANK;
864 fb_info->bl_dev->ops->update_status(fb_info->bl_dev);
865 }
866 #endif
867
868 return 0;
869
870 reg_fail:
871 if (par->fbtftops.unregister_backlight)
872 par->fbtftops.unregister_backlight(par);
873
874 return ret;
875 }
876 EXPORT_SYMBOL(fbtft_register_framebuffer);
877
878 /**
879 * fbtft_unregister_framebuffer - releases a tft frame buffer device
880 * @fb_info: frame buffer info structure
881 *
882 * Frees SPI driverdata if needed
883 * Frees gpios.
884 * Unregisters frame buffer device.
885 *
886 */
fbtft_unregister_framebuffer(struct fb_info * fb_info)887 int fbtft_unregister_framebuffer(struct fb_info *fb_info)
888 {
889 struct fbtft_par *par = fb_info->par;
890
891 if (par->fbtftops.unregister_backlight)
892 par->fbtftops.unregister_backlight(par);
893 fbtft_sysfs_exit(par);
894 unregister_framebuffer(fb_info);
895
896 return 0;
897 }
898 EXPORT_SYMBOL(fbtft_unregister_framebuffer);
899
900 #ifdef CONFIG_OF
901 /**
902 * fbtft_init_display_dt() - Device Tree init_display() function
903 * @par: Driver data
904 *
905 * Return: 0 if successful, negative if error
906 */
fbtft_init_display_dt(struct fbtft_par * par)907 static int fbtft_init_display_dt(struct fbtft_par *par)
908 {
909 struct device_node *node = par->info->device->of_node;
910 struct property *prop;
911 const __be32 *p;
912 u32 val;
913 int buf[64], i, j;
914
915 if (!node)
916 return -EINVAL;
917
918 prop = of_find_property(node, "init", NULL);
919 p = of_prop_next_u32(prop, NULL, &val);
920 if (!p)
921 return -EINVAL;
922
923 par->fbtftops.reset(par);
924 if (par->gpio.cs)
925 gpiod_set_value(par->gpio.cs, 0); /* Activate chip */
926
927 while (p) {
928 if (val & FBTFT_OF_INIT_CMD) {
929 val &= 0xFFFF;
930 i = 0;
931 while (p && !(val & 0xFFFF0000)) {
932 if (i > 63) {
933 dev_err(par->info->device,
934 "%s: Maximum register values exceeded\n",
935 __func__);
936 return -EINVAL;
937 }
938 buf[i++] = val;
939 p = of_prop_next_u32(prop, p, &val);
940 }
941 /* make debug message */
942 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
943 "init: write_register:\n");
944 for (j = 0; j < i; j++)
945 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
946 "buf[%d] = %02X\n", j, buf[j]);
947
948 par->fbtftops.write_register(par, i,
949 buf[0], buf[1], buf[2], buf[3],
950 buf[4], buf[5], buf[6], buf[7],
951 buf[8], buf[9], buf[10], buf[11],
952 buf[12], buf[13], buf[14], buf[15],
953 buf[16], buf[17], buf[18], buf[19],
954 buf[20], buf[21], buf[22], buf[23],
955 buf[24], buf[25], buf[26], buf[27],
956 buf[28], buf[29], buf[30], buf[31],
957 buf[32], buf[33], buf[34], buf[35],
958 buf[36], buf[37], buf[38], buf[39],
959 buf[40], buf[41], buf[42], buf[43],
960 buf[44], buf[45], buf[46], buf[47],
961 buf[48], buf[49], buf[50], buf[51],
962 buf[52], buf[53], buf[54], buf[55],
963 buf[56], buf[57], buf[58], buf[59],
964 buf[60], buf[61], buf[62], buf[63]);
965 } else if (val & FBTFT_OF_INIT_DELAY) {
966 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
967 "init: msleep(%u)\n", val & 0xFFFF);
968 msleep(val & 0xFFFF);
969 p = of_prop_next_u32(prop, p, &val);
970 } else {
971 dev_err(par->info->device, "illegal init value 0x%X\n",
972 val);
973 return -EINVAL;
974 }
975 }
976
977 return 0;
978 }
979 #endif
980
981 /**
982 * fbtft_init_display() - Generic init_display() function
983 * @par: Driver data
984 *
985 * Uses par->init_sequence to do the initialization
986 *
987 * Return: 0 if successful, negative if error
988 */
fbtft_init_display(struct fbtft_par * par)989 int fbtft_init_display(struct fbtft_par *par)
990 {
991 int buf[64];
992 char msg[128];
993 char str[16];
994 int i = 0;
995 int j;
996
997 /* sanity check */
998 if (!par->init_sequence) {
999 dev_err(par->info->device,
1000 "error: init_sequence is not set\n");
1001 return -EINVAL;
1002 }
1003
1004 /* make sure stop marker exists */
1005 for (i = 0; i < FBTFT_MAX_INIT_SEQUENCE; i++)
1006 if (par->init_sequence[i] == -3)
1007 break;
1008 if (i == FBTFT_MAX_INIT_SEQUENCE) {
1009 dev_err(par->info->device,
1010 "missing stop marker at end of init sequence\n");
1011 return -EINVAL;
1012 }
1013
1014 par->fbtftops.reset(par);
1015 if (par->gpio.cs)
1016 gpiod_set_value(par->gpio.cs, 0); /* Activate chip */
1017
1018 i = 0;
1019 while (i < FBTFT_MAX_INIT_SEQUENCE) {
1020 if (par->init_sequence[i] == -3) {
1021 /* done */
1022 return 0;
1023 }
1024 if (par->init_sequence[i] >= 0) {
1025 dev_err(par->info->device,
1026 "missing delimiter at position %d\n", i);
1027 return -EINVAL;
1028 }
1029 if (par->init_sequence[i + 1] < 0) {
1030 dev_err(par->info->device,
1031 "missing value after delimiter %d at position %d\n",
1032 par->init_sequence[i], i);
1033 return -EINVAL;
1034 }
1035 switch (par->init_sequence[i]) {
1036 case -1:
1037 i++;
1038 /* make debug message */
1039 strcpy(msg, "");
1040 j = i + 1;
1041 while (par->init_sequence[j] >= 0) {
1042 sprintf(str, "0x%02X ", par->init_sequence[j]);
1043 strcat(msg, str);
1044 j++;
1045 }
1046 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
1047 "init: write(0x%02X) %s\n",
1048 par->init_sequence[i], msg);
1049
1050 /* Write */
1051 j = 0;
1052 while (par->init_sequence[i] >= 0) {
1053 if (j > 63) {
1054 dev_err(par->info->device,
1055 "%s: Maximum register values exceeded\n",
1056 __func__);
1057 return -EINVAL;
1058 }
1059 buf[j++] = par->init_sequence[i++];
1060 }
1061 par->fbtftops.write_register(par, j,
1062 buf[0], buf[1], buf[2], buf[3],
1063 buf[4], buf[5], buf[6], buf[7],
1064 buf[8], buf[9], buf[10], buf[11],
1065 buf[12], buf[13], buf[14], buf[15],
1066 buf[16], buf[17], buf[18], buf[19],
1067 buf[20], buf[21], buf[22], buf[23],
1068 buf[24], buf[25], buf[26], buf[27],
1069 buf[28], buf[29], buf[30], buf[31],
1070 buf[32], buf[33], buf[34], buf[35],
1071 buf[36], buf[37], buf[38], buf[39],
1072 buf[40], buf[41], buf[42], buf[43],
1073 buf[44], buf[45], buf[46], buf[47],
1074 buf[48], buf[49], buf[50], buf[51],
1075 buf[52], buf[53], buf[54], buf[55],
1076 buf[56], buf[57], buf[58], buf[59],
1077 buf[60], buf[61], buf[62], buf[63]);
1078 break;
1079 case -2:
1080 i++;
1081 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
1082 "init: mdelay(%d)\n",
1083 par->init_sequence[i]);
1084 mdelay(par->init_sequence[i++]);
1085 break;
1086 default:
1087 dev_err(par->info->device,
1088 "unknown delimiter %d at position %d\n",
1089 par->init_sequence[i], i);
1090 return -EINVAL;
1091 }
1092 }
1093
1094 dev_err(par->info->device,
1095 "%s: something is wrong. Shouldn't get here.\n", __func__);
1096 return -EINVAL;
1097 }
1098 EXPORT_SYMBOL(fbtft_init_display);
1099
1100 /**
1101 * fbtft_verify_gpios() - Generic verify_gpios() function
1102 * @par: Driver data
1103 *
1104 * Uses @spi, @pdev and @buswidth to determine which GPIOs is needed
1105 *
1106 * Return: 0 if successful, negative if error
1107 */
fbtft_verify_gpios(struct fbtft_par * par)1108 static int fbtft_verify_gpios(struct fbtft_par *par)
1109 {
1110 struct fbtft_platform_data *pdata = par->pdata;
1111 int i;
1112
1113 fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);
1114
1115 if (pdata->display.buswidth != 9 && par->startbyte == 0 &&
1116 !par->gpio.dc) {
1117 dev_err(par->info->device,
1118 "Missing info about 'dc' gpio. Aborting.\n");
1119 return -EINVAL;
1120 }
1121
1122 if (!par->pdev)
1123 return 0;
1124
1125 if (!par->gpio.wr) {
1126 dev_err(par->info->device, "Missing 'wr' gpio. Aborting.\n");
1127 return -EINVAL;
1128 }
1129 for (i = 0; i < pdata->display.buswidth; i++) {
1130 if (!par->gpio.db[i]) {
1131 dev_err(par->info->device,
1132 "Missing 'db%02d' gpio. Aborting.\n", i);
1133 return -EINVAL;
1134 }
1135 }
1136
1137 return 0;
1138 }
1139
1140 #ifdef CONFIG_OF
1141 /* returns 0 if the property is not present */
fbtft_of_value(struct device_node * node,const char * propname)1142 static u32 fbtft_of_value(struct device_node *node, const char *propname)
1143 {
1144 int ret;
1145 u32 val = 0;
1146
1147 ret = of_property_read_u32(node, propname, &val);
1148 if (ret == 0)
1149 pr_info("%s: %s = %u\n", __func__, propname, val);
1150
1151 return val;
1152 }
1153
fbtft_probe_dt(struct device * dev)1154 static struct fbtft_platform_data *fbtft_probe_dt(struct device *dev)
1155 {
1156 struct device_node *node = dev->of_node;
1157 struct fbtft_platform_data *pdata;
1158
1159 if (!node) {
1160 dev_err(dev, "Missing platform data or DT\n");
1161 return ERR_PTR(-EINVAL);
1162 }
1163
1164 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1165 if (!pdata)
1166 return ERR_PTR(-ENOMEM);
1167
1168 pdata->display.width = fbtft_of_value(node, "width");
1169 pdata->display.height = fbtft_of_value(node, "height");
1170 pdata->display.regwidth = fbtft_of_value(node, "regwidth");
1171 pdata->display.buswidth = fbtft_of_value(node, "buswidth");
1172 pdata->display.backlight = fbtft_of_value(node, "backlight");
1173 pdata->display.bpp = fbtft_of_value(node, "bpp");
1174 pdata->display.debug = fbtft_of_value(node, "debug");
1175 pdata->rotate = fbtft_of_value(node, "rotate");
1176 pdata->bgr = of_property_read_bool(node, "bgr");
1177 pdata->fps = fbtft_of_value(node, "fps");
1178 pdata->txbuflen = fbtft_of_value(node, "txbuflen");
1179 pdata->startbyte = fbtft_of_value(node, "startbyte");
1180 of_property_read_string(node, "gamma", (const char **)&pdata->gamma);
1181
1182 if (of_find_property(node, "led-gpios", NULL))
1183 pdata->display.backlight = 1;
1184 if (of_find_property(node, "init", NULL))
1185 pdata->display.fbtftops.init_display = fbtft_init_display_dt;
1186 pdata->display.fbtftops.request_gpios = fbtft_request_gpios_dt;
1187
1188 return pdata;
1189 }
1190 #else
fbtft_probe_dt(struct device * dev)1191 static struct fbtft_platform_data *fbtft_probe_dt(struct device *dev)
1192 {
1193 dev_err(dev, "Missing platform data\n");
1194 return ERR_PTR(-EINVAL);
1195 }
1196 #endif
1197
1198 /**
1199 * fbtft_probe_common() - Generic device probe() helper function
1200 * @display: Display properties
1201 * @sdev: SPI device
1202 * @pdev: Platform device
1203 *
1204 * Allocates, initializes and registers a framebuffer
1205 *
1206 * Either @sdev or @pdev should be NULL
1207 *
1208 * Return: 0 if successful, negative if error
1209 */
fbtft_probe_common(struct fbtft_display * display,struct spi_device * sdev,struct platform_device * pdev)1210 int fbtft_probe_common(struct fbtft_display *display,
1211 struct spi_device *sdev,
1212 struct platform_device *pdev)
1213 {
1214 struct device *dev;
1215 struct fb_info *info;
1216 struct fbtft_par *par;
1217 struct fbtft_platform_data *pdata;
1218 int ret;
1219
1220 if (sdev)
1221 dev = &sdev->dev;
1222 else
1223 dev = &pdev->dev;
1224
1225 if (unlikely(display->debug & DEBUG_DRIVER_INIT_FUNCTIONS))
1226 dev_info(dev, "%s()\n", __func__);
1227
1228 pdata = dev->platform_data;
1229 if (!pdata) {
1230 pdata = fbtft_probe_dt(dev);
1231 if (IS_ERR(pdata))
1232 return PTR_ERR(pdata);
1233 }
1234
1235 info = fbtft_framebuffer_alloc(display, dev, pdata);
1236 if (!info)
1237 return -ENOMEM;
1238
1239 par = info->par;
1240 par->spi = sdev;
1241 par->pdev = pdev;
1242
1243 if (display->buswidth == 0) {
1244 dev_err(dev, "buswidth is not set\n");
1245 return -EINVAL;
1246 }
1247
1248 /* write register functions */
1249 if (display->regwidth == 8 && display->buswidth == 8)
1250 par->fbtftops.write_register = fbtft_write_reg8_bus8;
1251 else if (display->regwidth == 8 && display->buswidth == 9 && par->spi)
1252 par->fbtftops.write_register = fbtft_write_reg8_bus9;
1253 else if (display->regwidth == 16 && display->buswidth == 8)
1254 par->fbtftops.write_register = fbtft_write_reg16_bus8;
1255 else if (display->regwidth == 16 && display->buswidth == 16)
1256 par->fbtftops.write_register = fbtft_write_reg16_bus16;
1257 else
1258 dev_warn(dev,
1259 "no default functions for regwidth=%d and buswidth=%d\n",
1260 display->regwidth, display->buswidth);
1261
1262 /* write_vmem() functions */
1263 if (display->buswidth == 8)
1264 par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
1265 else if (display->buswidth == 9)
1266 par->fbtftops.write_vmem = fbtft_write_vmem16_bus9;
1267 else if (display->buswidth == 16)
1268 par->fbtftops.write_vmem = fbtft_write_vmem16_bus16;
1269
1270 /* GPIO write() functions */
1271 if (par->pdev) {
1272 if (display->buswidth == 8)
1273 par->fbtftops.write = fbtft_write_gpio8_wr;
1274 else if (display->buswidth == 16)
1275 par->fbtftops.write = fbtft_write_gpio16_wr;
1276 }
1277
1278 /* 9-bit SPI setup */
1279 if (par->spi && display->buswidth == 9) {
1280 if (par->spi->master->bits_per_word_mask & SPI_BPW_MASK(9)) {
1281 par->spi->bits_per_word = 9;
1282 } else {
1283 dev_warn(&par->spi->dev,
1284 "9-bit SPI not available, emulating using 8-bit.\n");
1285 /* allocate buffer with room for dc bits */
1286 par->extra = devm_kzalloc(par->info->device,
1287 par->txbuf.len +
1288 (par->txbuf.len / 8) + 8,
1289 GFP_KERNEL);
1290 if (!par->extra) {
1291 ret = -ENOMEM;
1292 goto out_release;
1293 }
1294 par->fbtftops.write = fbtft_write_spi_emulate_9;
1295 }
1296 }
1297
1298 if (!par->fbtftops.verify_gpios)
1299 par->fbtftops.verify_gpios = fbtft_verify_gpios;
1300
1301 /* make sure we still use the driver provided functions */
1302 fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
1303
1304 /* use init_sequence if provided */
1305 if (par->init_sequence)
1306 par->fbtftops.init_display = fbtft_init_display;
1307
1308 /* use platform_data provided functions above all */
1309 fbtft_merge_fbtftops(&par->fbtftops, &pdata->display.fbtftops);
1310
1311 ret = fbtft_register_framebuffer(info);
1312 if (ret < 0)
1313 goto out_release;
1314
1315 return 0;
1316
1317 out_release:
1318 fbtft_framebuffer_release(info);
1319
1320 return ret;
1321 }
1322 EXPORT_SYMBOL(fbtft_probe_common);
1323
1324 /**
1325 * fbtft_remove_common() - Generic device remove() helper function
1326 * @dev: Device
1327 * @info: Framebuffer
1328 *
1329 * Unregisters and releases the framebuffer
1330 *
1331 * Return: 0 if successful, negative if error
1332 */
fbtft_remove_common(struct device * dev,struct fb_info * info)1333 int fbtft_remove_common(struct device *dev, struct fb_info *info)
1334 {
1335 struct fbtft_par *par;
1336
1337 if (!info)
1338 return -EINVAL;
1339 par = info->par;
1340 if (par)
1341 fbtft_par_dbg(DEBUG_DRIVER_INIT_FUNCTIONS, par,
1342 "%s()\n", __func__);
1343 fbtft_unregister_framebuffer(info);
1344 fbtft_framebuffer_release(info);
1345
1346 return 0;
1347 }
1348 EXPORT_SYMBOL(fbtft_remove_common);
1349
1350 MODULE_LICENSE("GPL");
1351