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fbtft: Make sure string is NULL terminated
[mirror_ubuntu-bionic-kernel.git] / drivers / staging / fbtft / fbtft-core.c
CommitLineData
c296d5f9
TP		 1/*
2 * Copyright (C) 2013 Noralf Tronnes
3 *
4 * This driver is inspired by:
5 * st7735fb.c, Copyright (C) 2011, Matt Porter
6 * broadsheetfb.c, Copyright (C) 2008, Jaya Kumar
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
c296d5f9
TP		 17 */
18
19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/string.h>
23#include <linux/mm.h>
24#include <linux/vmalloc.h>
25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/fb.h>
28#include <linux/gpio.h>
29#include <linux/spi/spi.h>
30#include <linux/delay.h>
31#include <linux/uaccess.h>
32#include <linux/backlight.h>
33#include <linux/platform_device.h>
34#include <linux/spinlock.h>
c296d5f9
TP		 35#include <linux/of.h>
36#include <linux/of_gpio.h>
a79cb390 37#include <video/mipi_display.h>
c296d5f9
TP		 38
39#include "fbtft.h"
d9fabbde 40#include "internal.h"
c296d5f9
TP		 41
42static unsigned long debug;
ced04842 43module_param(debug, ulong, 0000);
c296d5f9
TP		 44MODULE_PARM_DESC(debug, "override device debug level");
45
60da7020
HK		 46int fbtft_write_buf_dc(struct fbtft_par *par, void *buf, size_t len, int dc)
47{
48 int ret;
49
50 if (gpio_is_valid(par->gpio.dc))
51 gpio_set_value(par->gpio.dc, dc);
52
53 ret = par->fbtftops.write(par, buf, len);
54 if (ret < 0)
55 dev_err(par->info->device,
56 "write() failed and returned %d\n", ret);
57 return ret;
58}
59EXPORT_SYMBOL(fbtft_write_buf_dc);
60
c296d5f9 61void fbtft_dbg_hex(const struct device *dev, int groupsize,
4da2f4b7 62 void *buf, size_t len, const char *fmt, ...)
c296d5f9
TP		 63{
64 va_list args;
65 static char textbuf[512];
66 char *text = textbuf;
67 size_t text_len;
68
69 va_start(args, fmt);
70 text_len = vscnprintf(text, sizeof(textbuf), fmt, args);
71 va_end(args);
72
73 hex_dump_to_buffer(buf, len, 32, groupsize, text + text_len,
4da2f4b7 74 512 - text_len, false);
c296d5f9
TP		 75
76 if (len > 32)
77 dev_info(dev, "%s ...\n", text);
78 else
79 dev_info(dev, "%s\n", text);
80}
81EXPORT_SYMBOL(fbtft_dbg_hex);
82
ed208436 83static unsigned long fbtft_request_gpios_match(struct fbtft_par *par,
4da2f4b7 84 const struct fbtft_gpio *gpio)
c296d5f9
TP		 85{
86 int ret;
0d0d4d21 87 unsigned int val;
c296d5f9
TP		 88
89 fbtft_par_dbg(DEBUG_REQUEST_GPIOS_MATCH, par, "%s('%s')\n",
4da2f4b7 90 __func__, gpio->name);
c296d5f9
TP		 91
92 if (strcasecmp(gpio->name, "reset") == 0) {
93 par->gpio.reset = gpio->gpio;
94 return GPIOF_OUT_INIT_HIGH;
95 } else if (strcasecmp(gpio->name, "dc") == 0) {
96 par->gpio.dc = gpio->gpio;
97 return GPIOF_OUT_INIT_LOW;
98 } else if (strcasecmp(gpio->name, "cs") == 0) {
99 par->gpio.cs = gpio->gpio;
100 return GPIOF_OUT_INIT_HIGH;
101 } else if (strcasecmp(gpio->name, "wr") == 0) {
102 par->gpio.wr = gpio->gpio;
103 return GPIOF_OUT_INIT_HIGH;
104 } else if (strcasecmp(gpio->name, "rd") == 0) {
105 par->gpio.rd = gpio->gpio;
106 return GPIOF_OUT_INIT_HIGH;
107 } else if (strcasecmp(gpio->name, "latch") == 0) {
108 par->gpio.latch = gpio->gpio;
109 return GPIOF_OUT_INIT_LOW;
110 } else if (gpio->name[0] == 'd' && gpio->name[1] == 'b') {
0d0d4d21 111 ret = kstrtouint(&gpio->name[2], 10, &val);
c296d5f9
TP		 112 if (ret == 0 && val < 16) {
113 par->gpio.db[val] = gpio->gpio;
114 return GPIOF_OUT_INIT_LOW;
115 }
116 } else if (strcasecmp(gpio->name, "led") == 0) {
117 par->gpio.led[0] = gpio->gpio;
118 return GPIOF_OUT_INIT_LOW;
119 } else if (strcasecmp(gpio->name, "led_") == 0) {
120 par->gpio.led[0] = gpio->gpio;
121 return GPIOF_OUT_INIT_HIGH;
122 }
123
124 return FBTFT_GPIO_NO_MATCH;
125}
126
ed208436 127static int fbtft_request_gpios(struct fbtft_par *par)
c296d5f9
TP		 128{
129 struct fbtft_platform_data *pdata = par->pdata;
130 const struct fbtft_gpio *gpio;
131 unsigned long flags;
132 int ret;
133
ed20c6fb
MR		 134 if (!(pdata && pdata->gpios))
135 return 0;
136
137 gpio = pdata->gpios;
138 while (gpio->name[0]) {
139 flags = FBTFT_GPIO_NO_MATCH;
140 /* if driver provides match function, try it first,
e4d1bff1
AJ		 141 * if no match use our own
142 */
ed20c6fb
MR		 143 if (par->fbtftops.request_gpios_match)
144 flags = par->fbtftops.request_gpios_match(par, gpio);
145 if (flags == FBTFT_GPIO_NO_MATCH)
146 flags = fbtft_request_gpios_match(par, gpio);
147 if (flags != FBTFT_GPIO_NO_MATCH) {
148 ret = devm_gpio_request_one(par->info->device,
149 gpio->gpio, flags,
150 par->info->device->driver->name);
151 if (ret < 0) {
152 dev_err(par->info->device,
153 "%s: gpio_request_one('%s'=%d) failed with %d\n",
154 __func__, gpio->name,
155 gpio->gpio, ret);
156 return ret;
c296d5f9 157 }
ed20c6fb 158 fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par,
4da2f4b7
GS		 159 "%s: '%s' = GPIO%d\n",
160 __func__, gpio->name, gpio->gpio);
c296d5f9 161 }
ed20c6fb 162 gpio++;
c296d5f9
TP		 163 }
164
165 return 0;
166}
167
168#ifdef CONFIG_OF
169static int fbtft_request_one_gpio(struct fbtft_par *par,
170 const char *name, int index, int *gpiop)
171{
172 struct device *dev = par->info->device;
173 struct device_node *node = dev->of_node;
174 int gpio, flags, ret = 0;
175 enum of_gpio_flags of_flags;
176
177 if (of_find_property(node, name, NULL)) {
178 gpio = of_get_named_gpio_flags(node, name, index, &of_flags);
179 if (gpio == -ENOENT)
180 return 0;
181 if (gpio == -EPROBE_DEFER)
182 return gpio;
183 if (gpio < 0) {
184 dev_err(dev,
185 "failed to get '%s' from DT\n", name);
186 return gpio;
187 }
188
189 /* active low translates to initially low */
190 flags = (of_flags & OF_GPIO_ACTIVE_LOW) ? GPIOF_OUT_INIT_LOW :
191 GPIOF_OUT_INIT_HIGH;
192 ret = devm_gpio_request_one(dev, gpio, flags,
4da2f4b7 193 dev->driver->name);
c296d5f9
TP		 194 if (ret) {
195 dev_err(dev,
196 "gpio_request_one('%s'=%d) failed with %d\n",
197 name, gpio, ret);
198 return ret;
199 }
200 if (gpiop)
201 *gpiop = gpio;
202 fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' = GPIO%d\n",
4da2f4b7 203 __func__, name, gpio);
c296d5f9
TP		 204 }
205
206 return ret;
207}
208
209static int fbtft_request_gpios_dt(struct fbtft_par *par)
210{
211 int i;
212 int ret;
213
214 if (!par->info->device->of_node)
215 return -EINVAL;
216
217 ret = fbtft_request_one_gpio(par, "reset-gpios", 0, &par->gpio.reset);
218 if (ret)
219 return ret;
220 ret = fbtft_request_one_gpio(par, "dc-gpios", 0, &par->gpio.dc);
221 if (ret)
222 return ret;
223 ret = fbtft_request_one_gpio(par, "rd-gpios", 0, &par->gpio.rd);
224 if (ret)
225 return ret;
226 ret = fbtft_request_one_gpio(par, "wr-gpios", 0, &par->gpio.wr);
227 if (ret)
228 return ret;
229 ret = fbtft_request_one_gpio(par, "cs-gpios", 0, &par->gpio.cs);
230 if (ret)
231 return ret;
232 ret = fbtft_request_one_gpio(par, "latch-gpios", 0, &par->gpio.latch);
233 if (ret)
234 return ret;
235 for (i = 0; i < 16; i++) {
236 ret = fbtft_request_one_gpio(par, "db-gpios", i,
4da2f4b7 237 &par->gpio.db[i]);
c296d5f9
TP		 238 if (ret)
239 return ret;
240 ret = fbtft_request_one_gpio(par, "led-gpios", i,
4da2f4b7 241 &par->gpio.led[i]);
c296d5f9
TP		 242 if (ret)
243 return ret;
244 ret = fbtft_request_one_gpio(par, "aux-gpios", i,
4da2f4b7 245 &par->gpio.aux[i]);
c296d5f9
TP		 246 if (ret)
247 return ret;
248 }
249
250 return 0;
251}
252#endif
253
254#ifdef CONFIG_FB_BACKLIGHT
ed208436 255static int fbtft_backlight_update_status(struct backlight_device *bd)
c296d5f9
TP		 256{
257 struct fbtft_par *par = bl_get_data(bd);
258 bool polarity = !!(bd->props.state & BL_CORE_DRIVER1);
259
260 fbtft_par_dbg(DEBUG_BACKLIGHT, par,
261 "%s: polarity=%d, power=%d, fb_blank=%d\n",
262 __func__, polarity, bd->props.power, bd->props.fb_blank);
263
1007e613
MS		 264 if ((bd->props.power == FB_BLANK_UNBLANK) &&
265 (bd->props.fb_blank == FB_BLANK_UNBLANK))
c296d5f9
TP		 266 gpio_set_value(par->gpio.led[0], polarity);
267 else
268 gpio_set_value(par->gpio.led[0], !polarity);
269
270 return 0;
271}
272
ed208436 273static int fbtft_backlight_get_brightness(struct backlight_device *bd)
c296d5f9
TP		 274{
275 return bd->props.brightness;
276}
277
278void fbtft_unregister_backlight(struct fbtft_par *par)
279{
c296d5f9
TP		 280 if (par->info->bl_dev) {
281 par->info->bl_dev->props.power = FB_BLANK_POWERDOWN;
282 backlight_update_status(par->info->bl_dev);
c296d5f9
TP		 283 backlight_device_unregister(par->info->bl_dev);
284 par->info->bl_dev = NULL;
285 }
286}
287
c18d116d
MR		 288static const struct backlight_ops fbtft_bl_ops = {
289 .get_brightness = fbtft_backlight_get_brightness,
290 .update_status = fbtft_backlight_update_status,
291};
292
c296d5f9
TP		 293void fbtft_register_backlight(struct fbtft_par *par)
294{
295 struct backlight_device *bd;
296 struct backlight_properties bl_props = { 0, };
c296d5f9 297
c296d5f9
TP		 298 if (par->gpio.led[0] == -1) {
299 fbtft_par_dbg(DEBUG_BACKLIGHT, par,
4da2f4b7 300 "%s(): led pin not set, exiting.\n", __func__);
c296d5f9
TP		 301 return;
302 }
303
c296d5f9
TP		 304 bl_props.type = BACKLIGHT_RAW;
305 /* Assume backlight is off, get polarity from current state of pin */
306 bl_props.power = FB_BLANK_POWERDOWN;
307 if (!gpio_get_value(par->gpio.led[0]))
308 bl_props.state |= BL_CORE_DRIVER1;
309
310 bd = backlight_device_register(dev_driver_string(par->info->device),
1007e613
MS		 311 par->info->device, par,
312 &fbtft_bl_ops, &bl_props);
c296d5f9
TP		 313 if (IS_ERR(bd)) {
314 dev_err(par->info->device,
315 "cannot register backlight device (%ld)\n",
316 PTR_ERR(bd));
317 return;
318 }
319 par->info->bl_dev = bd;
320
321 if (!par->fbtftops.unregister_backlight)
322 par->fbtftops.unregister_backlight = fbtft_unregister_backlight;
323}
324#else
325void fbtft_register_backlight(struct fbtft_par *par) { };
326void fbtft_unregister_backlight(struct fbtft_par *par) { };
327#endif
328EXPORT_SYMBOL(fbtft_register_backlight);
329EXPORT_SYMBOL(fbtft_unregister_backlight);
330
ed208436
KA		 331static void fbtft_set_addr_win(struct fbtft_par *par, int xs, int ys, int xe,
332 int ye)
c296d5f9 333{
a79cb390
PL		 334 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
335 (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
c296d5f9 336
a79cb390
PL		 337 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
338 (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
c296d5f9 339
a79cb390 340 write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
c296d5f9
TP		 341}
342
ed208436 343static void fbtft_reset(struct fbtft_par *par)
c296d5f9
TP		 344{
345 if (par->gpio.reset == -1)
346 return;
347 fbtft_par_dbg(DEBUG_RESET, par, "%s()\n", __func__);
9ed2bfb3
AS		 348 gpio_set_value_cansleep(par->gpio.reset, 0);
349 usleep_range(20, 40);
350 gpio_set_value_cansleep(par->gpio.reset, 1);
351 msleep(120);
c296d5f9
TP		 352}
353
1c41494a
MY		 354static void fbtft_update_display(struct fbtft_par *par, unsigned int start_line,
355 unsigned int end_line)
c296d5f9
TP		 356{
357 size_t offset, len;
367e8560 358 ktime_t ts_start, ts_end;
c296d5f9
TP		 359 long fps, throughput;
360 bool timeit = false;
361 int ret = 0;
362
1007e613
MS		 363 if (unlikely(par->debug & (DEBUG_TIME_FIRST_UPDATE |
364 DEBUG_TIME_EACH_UPDATE))) {
6ba67a5a 365 if ((par->debug & DEBUG_TIME_EACH_UPDATE) ||
4da2f4b7
GS		 366 ((par->debug & DEBUG_TIME_FIRST_UPDATE) &&
367 !par->first_update_done)) {
367e8560 368 ts_start = ktime_get();
c296d5f9
TP		 369 timeit = true;
370 }
371 }
372
373 /* Sanity checks */
374 if (start_line > end_line) {
375 dev_warn(par->info->device,
1007e613
MS		 376 "%s: start_line=%u is larger than end_line=%u. Shouldn't happen, will do full display update\n",
377 __func__, start_line, end_line);
c296d5f9
TP		 378 start_line = 0;
379 end_line = par->info->var.yres - 1;
380 }
1007e613
MS		 381 if (start_line > par->info->var.yres - 1 ||
382 end_line > par->info->var.yres - 1) {
c296d5f9
TP		 383 dev_warn(par->info->device,
384 "%s: start_line=%u or end_line=%u is larger than max=%d. Shouldn't happen, will do full display update\n",
1007e613
MS		 385 __func__, start_line,
386 end_line, par->info->var.yres - 1);
c296d5f9
TP		 387 start_line = 0;
388 end_line = par->info->var.yres - 1;
389 }
390
391 fbtft_par_dbg(DEBUG_UPDATE_DISPLAY, par, "%s(start_line=%u, end_line=%u)\n",
4da2f4b7 392 __func__, start_line, end_line);
c296d5f9
TP		 393
394 if (par->fbtftops.set_addr_win)
395 par->fbtftops.set_addr_win(par, 0, start_line,
94c0a544 396 par->info->var.xres - 1, end_line);
c296d5f9
TP		 397
398 offset = start_line * par->info->fix.line_length;
399 len = (end_line - start_line + 1) * par->info->fix.line_length;
400 ret = par->fbtftops.write_vmem(par, offset, len);
401 if (ret < 0)
402 dev_err(par->info->device,
403 "%s: write_vmem failed to update display buffer\n",
404 __func__);
405
406 if (unlikely(timeit)) {
367e8560 407 ts_end = ktime_get();
fc1e2c8e 408 if (!ktime_to_ns(par->update_time))
367e8560
KS		 409 par->update_time = ts_start;
410
367e8560 411 fps = ktime_us_delta(ts_start, par->update_time);
fc1e2c8e 412 par->update_time = ts_start;
c296d5f9
TP		 413 fps = fps ? 1000000 / fps : 0;
414
367e8560 415 throughput = ktime_us_delta(ts_end, ts_start);
c296d5f9
TP		 416 throughput = throughput ? (len * 1000) / throughput : 0;
417 throughput = throughput * 1000 / 1024;
418
419 dev_info(par->info->device,
4da2f4b7
GS		 420 "Display update: %ld kB/s, fps=%ld\n",
421 throughput, fps);
c296d5f9
TP		 422 par->first_update_done = true;
423 }
424}
425
ed208436 426static void fbtft_mkdirty(struct fb_info *info, int y, int height)
c296d5f9
TP		 427{
428 struct fbtft_par *par = info->par;
429 struct fb_deferred_io *fbdefio = info->fbdefio;
430
431 /* special case, needed ? */
432 if (y == -1) {
433 y = 0;
434 height = info->var.yres - 1;
435 }
436
437 /* Mark display lines/area as dirty */
438 spin_lock(&par->dirty_lock);
439 if (y < par->dirty_lines_start)
440 par->dirty_lines_start = y;
441 if (y + height - 1 > par->dirty_lines_end)
442 par->dirty_lines_end = y + height - 1;
443 spin_unlock(&par->dirty_lock);
444
445 /* Schedule deferred_io to update display (no-op if already on queue)*/
446 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
447}
448
ed208436 449static void fbtft_deferred_io(struct fb_info *info, struct list_head *pagelist)
c296d5f9
TP		 450{
451 struct fbtft_par *par = info->par;
1c41494a 452 unsigned int dirty_lines_start, dirty_lines_end;
c296d5f9
TP		 453 struct page *page;
454 unsigned long index;
1c41494a 455 unsigned int y_low = 0, y_high = 0;
c296d5f9
TP		 456 int count = 0;
457
458 spin_lock(&par->dirty_lock);
459 dirty_lines_start = par->dirty_lines_start;
460 dirty_lines_end = par->dirty_lines_end;
461 /* set display line markers as clean */
462 par->dirty_lines_start = par->info->var.yres - 1;
463 par->dirty_lines_end = 0;
464 spin_unlock(&par->dirty_lock);
465
466 /* Mark display lines as dirty */
467 list_for_each_entry(page, pagelist, lru) {
468 count++;
469 index = page->index << PAGE_SHIFT;
470 y_low = index / info->fix.line_length;
471 y_high = (index + PAGE_SIZE - 1) / info->fix.line_length;
b38c760a 472 dev_dbg(info->device,
c296d5f9
TP		 473 "page->index=%lu y_low=%d y_high=%d\n",
474 page->index, y_low, y_high);
475 if (y_high > info->var.yres - 1)
476 y_high = info->var.yres - 1;
477 if (y_low < dirty_lines_start)
478 dirty_lines_start = y_low;
479 if (y_high > dirty_lines_end)
480 dirty_lines_end = y_high;
481 }
482
483 par->fbtftops.update_display(info->par,
484 dirty_lines_start, dirty_lines_end);
485}
486
ed208436
KA		 487static void fbtft_fb_fillrect(struct fb_info *info,
488 const struct fb_fillrect *rect)
c296d5f9
TP		 489{
490 struct fbtft_par *par = info->par;
491
b38c760a 492 dev_dbg(info->dev,
c296d5f9
TP		 493 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
494 __func__, rect->dx, rect->dy, rect->width, rect->height);
495 sys_fillrect(info, rect);
496
497 par->fbtftops.mkdirty(info, rect->dy, rect->height);
498}
499
ed208436
KA		 500static void fbtft_fb_copyarea(struct fb_info *info,
501 const struct fb_copyarea *area)
c296d5f9
TP		 502{
503 struct fbtft_par *par = info->par;
504
b38c760a 505 dev_dbg(info->dev,
c296d5f9
TP		 506 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
507 __func__, area->dx, area->dy, area->width, area->height);
508 sys_copyarea(info, area);
509
510 par->fbtftops.mkdirty(info, area->dy, area->height);
511}
512
ed208436
KA		 513static void fbtft_fb_imageblit(struct fb_info *info,
514 const struct fb_image *image)
c296d5f9
TP		 515{
516 struct fbtft_par *par = info->par;
517
b38c760a 518 dev_dbg(info->dev,
c296d5f9
TP		 519 "%s: dx=%d, dy=%d, width=%d, height=%d\n",
520 __func__, image->dx, image->dy, image->width, image->height);
521 sys_imageblit(info, image);
522
523 par->fbtftops.mkdirty(info, image->dy, image->height);
524}
525
ed208436
KA		 526static ssize_t fbtft_fb_write(struct fb_info *info, const char __user *buf,
527 size_t count, loff_t *ppos)
c296d5f9
TP		 528{
529 struct fbtft_par *par = info->par;
530 ssize_t res;
531
b38c760a 532 dev_dbg(info->dev,
c296d5f9
TP		 533 "%s: count=%zd, ppos=%llu\n", __func__, count, *ppos);
534 res = fb_sys_write(info, buf, count, ppos);
535
e4d1bff1 536 /* TODO: only mark changed area update all for now */
c296d5f9
TP		 537 par->fbtftops.mkdirty(info, -1, 0);
538
539 return res;
540}
541
542/* from pxafb.c */
1c41494a 543static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
c296d5f9
TP		 544{
545 chan &= 0xffff;
546 chan >>= 16 - bf->length;
547 return chan << bf->offset;
548}
549
1c41494a
MY		 550static int fbtft_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
551 unsigned int blue, unsigned int transp,
ed208436 552 struct fb_info *info)
c296d5f9 553{
1c41494a 554 unsigned int val;
c296d5f9
TP		 555 int ret = 1;
556
b38c760a 557 dev_dbg(info->dev,
c296d5f9
TP		 558 "%s(regno=%u, red=0x%X, green=0x%X, blue=0x%X, trans=0x%X)\n",
559 __func__, regno, red, green, blue, transp);
560
561 switch (info->fix.visual) {
562 case FB_VISUAL_TRUECOLOR:
563 if (regno < 16) {
564 u32 *pal = info->pseudo_palette;
565
566 val = chan_to_field(red, &info->var.red);
567 val |= chan_to_field(green, &info->var.green);
568 val |= chan_to_field(blue, &info->var.blue);
569
570 pal[regno] = val;
571 ret = 0;
572 }
573 break;
c296d5f9
TP		 574 }
575 return ret;
576}
577
ed208436 578static int fbtft_fb_blank(int blank, struct fb_info *info)
c296d5f9
TP		 579{
580 struct fbtft_par *par = info->par;
581 int ret = -EINVAL;
582
b38c760a 583 dev_dbg(info->dev, "%s(blank=%d)\n",
c296d5f9
TP		 584 __func__, blank);
585
586 if (!par->fbtftops.blank)
587 return ret;
588
589 switch (blank) {
590 case FB_BLANK_POWERDOWN:
591 case FB_BLANK_VSYNC_SUSPEND:
592 case FB_BLANK_HSYNC_SUSPEND:
593 case FB_BLANK_NORMAL:
594 ret = par->fbtftops.blank(par, true);
595 break;
596 case FB_BLANK_UNBLANK:
597 ret = par->fbtftops.blank(par, false);
598 break;
599 }
600 return ret;
601}
602
ed208436 603static void fbtft_merge_fbtftops(struct fbtft_ops *dst, struct fbtft_ops *src)
c296d5f9
TP		 604{
605 if (src->write)
606 dst->write = src->write;
607 if (src->read)
608 dst->read = src->read;
609 if (src->write_vmem)
610 dst->write_vmem = src->write_vmem;
611 if (src->write_register)
612 dst->write_register = src->write_register;
613 if (src->set_addr_win)
614 dst->set_addr_win = src->set_addr_win;
615 if (src->reset)
616 dst->reset = src->reset;
617 if (src->mkdirty)
618 dst->mkdirty = src->mkdirty;
619 if (src->update_display)
620 dst->update_display = src->update_display;
621 if (src->init_display)
622 dst->init_display = src->init_display;
623 if (src->blank)
624 dst->blank = src->blank;
625 if (src->request_gpios_match)
626 dst->request_gpios_match = src->request_gpios_match;
627 if (src->request_gpios)
628 dst->request_gpios = src->request_gpios;
629 if (src->verify_gpios)
630 dst->verify_gpios = src->verify_gpios;
631 if (src->register_backlight)
632 dst->register_backlight = src->register_backlight;
633 if (src->unregister_backlight)
634 dst->unregister_backlight = src->unregister_backlight;
635 if (src->set_var)
636 dst->set_var = src->set_var;
637 if (src->set_gamma)
638 dst->set_gamma = src->set_gamma;
639}
640
641/**
642 * fbtft_framebuffer_alloc - creates a new frame buffer info structure
643 *
644 * @display: pointer to structure describing the display
645 * @dev: pointer to the device for this fb, this can be NULL
646 *
647 * Creates a new frame buffer info structure.
648 *
649 * Also creates and populates the following structures:
650 * info->fbops
651 * info->fbdefio
652 * info->pseudo_palette
653 * par->fbtftops
654 * par->txbuf
655 *
656 * Returns the new structure, or NULL if an error occurred.
657 *
658 */
659struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
ad6d8812
NT		 660 struct device *dev,
661 struct fbtft_platform_data *pdata)
c296d5f9
TP		 662{
663 struct fb_info *info;
664 struct fbtft_par *par;
665 struct fb_ops *fbops = NULL;
666 struct fb_deferred_io *fbdefio = NULL;
c296d5f9
TP		 667 u8 *vmem = NULL;
668 void *txbuf = NULL;
669 void *buf = NULL;
1c41494a
MY		 670 unsigned int width;
671 unsigned int height;
c296d5f9 672 int txbuflen = display->txbuflen;
1c41494a
MY		 673 unsigned int bpp = display->bpp;
674 unsigned int fps = display->fps;
c296d5f9 675 int vmem_size, i;
0a859b31 676 const s16 *init_sequence = display->init_sequence;
c296d5f9 677 char *gamma = display->gamma;
22eb36b8 678 u32 *gamma_curves = NULL;
c296d5f9
TP		 679
680 /* sanity check */
1007e613
MS		 681 if (display->gamma_num * display->gamma_len >
682 FBTFT_GAMMA_MAX_VALUES_TOTAL) {
aed1c72e
HM		 683 dev_err(dev, "FBTFT_GAMMA_MAX_VALUES_TOTAL=%d is exceeded\n",
684 FBTFT_GAMMA_MAX_VALUES_TOTAL);
c296d5f9
TP		 685 return NULL;
686 }
687
688 /* defaults */
689 if (!fps)
690 fps = 20;
691 if (!bpp)
692 bpp = 16;
693
694 if (!pdata) {
695 dev_err(dev, "platform data is missing\n");
696 return NULL;
697 }
698
699 /* override driver values? */
700 if (pdata->fps)
701 fps = pdata->fps;
702 if (pdata->txbuflen)
703 txbuflen = pdata->txbuflen;
704 if (pdata->display.init_sequence)
705 init_sequence = pdata->display.init_sequence;
706 if (pdata->gamma)
707 gamma = pdata->gamma;
708 if (pdata->display.debug)
709 display->debug = pdata->display.debug;
710 if (pdata->display.backlight)
711 display->backlight = pdata->display.backlight;
712 if (pdata->display.width)
713 display->width = pdata->display.width;
714 if (pdata->display.height)
715 display->height = pdata->display.height;
716 if (pdata->display.buswidth)
717 display->buswidth = pdata->display.buswidth;
718 if (pdata->display.regwidth)
719 display->regwidth = pdata->display.regwidth;
720
721 display->debug |= debug;
722 fbtft_expand_debug_value(&display->debug);
723
724 switch (pdata->rotate) {
725 case 90:
726 case 270:
727 width = display->height;
728 height = display->width;
729 break;
730 default:
731 width = display->width;
732 height = display->height;
733 }
734
735 vmem_size = display->width * display->height * bpp / 8;
736 vmem = vzalloc(vmem_size);
737 if (!vmem)
738 goto alloc_fail;
739
740 fbops = devm_kzalloc(dev, sizeof(struct fb_ops), GFP_KERNEL);
741 if (!fbops)
742 goto alloc_fail;
743
744 fbdefio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL);
745 if (!fbdefio)
746 goto alloc_fail;
747
748 buf = devm_kzalloc(dev, 128, GFP_KERNEL);
749 if (!buf)
750 goto alloc_fail;
751
752 if (display->gamma_num && display->gamma_len) {
0c9ab986
AKC		 753 gamma_curves = devm_kcalloc(dev,
754 display->gamma_num *
755 display->gamma_len,
756 sizeof(gamma_curves[0]),
757 GFP_KERNEL);
c296d5f9
TP		 758 if (!gamma_curves)
759 goto alloc_fail;
760 }
761
762 info = framebuffer_alloc(sizeof(struct fbtft_par), dev);
763 if (!info)
764 goto alloc_fail;
765
4b6dc179 766 info->screen_buffer = vmem;
c296d5f9
TP		 767 info->fbops = fbops;
768 info->fbdefio = fbdefio;
769
770 fbops->owner = dev->driver->owner;
771 fbops->fb_read = fb_sys_read;
772 fbops->fb_write = fbtft_fb_write;
773 fbops->fb_fillrect = fbtft_fb_fillrect;
774 fbops->fb_copyarea = fbtft_fb_copyarea;
775 fbops->fb_imageblit = fbtft_fb_imageblit;
776 fbops->fb_setcolreg = fbtft_fb_setcolreg;
777 fbops->fb_blank = fbtft_fb_blank;
778
779 fbdefio->delay = HZ/fps;
780 fbdefio->deferred_io = fbtft_deferred_io;
781 fb_deferred_io_init(info);
782
7fb0b152 783 snprintf(info->fix.id, sizeof(info->fix.id), "%s", dev->driver->name);
c296d5f9
TP		 784 info->fix.type = FB_TYPE_PACKED_PIXELS;
785 info->fix.visual = FB_VISUAL_TRUECOLOR;
786 info->fix.xpanstep = 0;
787 info->fix.ypanstep = 0;
788 info->fix.ywrapstep = 0;
94c0a544 789 info->fix.line_length = width * bpp / 8;
c296d5f9
TP		 790 info->fix.accel = FB_ACCEL_NONE;
791 info->fix.smem_len = vmem_size;
792
793 info->var.rotate = pdata->rotate;
794 info->var.xres = width;
795 info->var.yres = height;
796 info->var.xres_virtual = info->var.xres;
797 info->var.yres_virtual = info->var.yres;
798 info->var.bits_per_pixel = bpp;
799 info->var.nonstd = 1;
800
801 /* RGB565 */
802 info->var.red.offset = 11;
803 info->var.red.length = 5;
804 info->var.green.offset = 5;
805 info->var.green.length = 6;
806 info->var.blue.offset = 0;
807 info->var.blue.length = 5;
808 info->var.transp.offset = 0;
809 info->var.transp.length = 0;
810
811 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
812
813 par = info->par;
814 par->info = info;
ad6d8812 815 par->pdata = pdata;
c296d5f9
TP		 816 par->debug = display->debug;
817 par->buf = buf;
818 spin_lock_init(&par->dirty_lock);
819 par->bgr = pdata->bgr;
820 par->startbyte = pdata->startbyte;
821 par->init_sequence = init_sequence;
822 par->gamma.curves = gamma_curves;
823 par->gamma.num_curves = display->gamma_num;
824 par->gamma.num_values = display->gamma_len;
825 mutex_init(&par->gamma.lock);
826 info->pseudo_palette = par->pseudo_palette;
827
828 if (par->gamma.curves && gamma) {
829 if (fbtft_gamma_parse_str(par,
830 par->gamma.curves, gamma, strlen(gamma)))
75d8929e 831 goto release_framebuf;
c296d5f9
TP		 832 }
833
834 /* Transmit buffer */
835 if (txbuflen == -1)
836 txbuflen = vmem_size + 2; /* add in case startbyte is used */
175f5a41
MS		 837 if (txbuflen >= vmem_size + 2)
838 txbuflen = 0;
c296d5f9
TP		 839
840#ifdef __LITTLE_ENDIAN
841 if ((!txbuflen) && (bpp > 8))
842 txbuflen = PAGE_SIZE; /* need buffer for byteswapping */
843#endif
844
845 if (txbuflen > 0) {
7c3eaadd 846 txbuf = devm_kzalloc(par->info->device, txbuflen, GFP_KERNEL);
c296d5f9 847 if (!txbuf)
75d8929e 848 goto release_framebuf;
c296d5f9
TP		 849 par->txbuf.buf = txbuf;
850 par->txbuf.len = txbuflen;
851 }
852
853 /* Initialize gpios to disabled */
854 par->gpio.reset = -1;
855 par->gpio.dc = -1;
856 par->gpio.rd = -1;
857 par->gpio.wr = -1;
858 par->gpio.cs = -1;
859 par->gpio.latch = -1;
860 for (i = 0; i < 16; i++) {
861 par->gpio.db[i] = -1;
862 par->gpio.led[i] = -1;
863 par->gpio.aux[i] = -1;
864 }
865
866 /* default fbtft operations */
867 par->fbtftops.write = fbtft_write_spi;
868 par->fbtftops.read = fbtft_read_spi;
869 par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
870 par->fbtftops.write_register = fbtft_write_reg8_bus8;
871 par->fbtftops.set_addr_win = fbtft_set_addr_win;
872 par->fbtftops.reset = fbtft_reset;
873 par->fbtftops.mkdirty = fbtft_mkdirty;
874 par->fbtftops.update_display = fbtft_update_display;
875 par->fbtftops.request_gpios = fbtft_request_gpios;
876 if (display->backlight)
877 par->fbtftops.register_backlight = fbtft_register_backlight;
878
879 /* use driver provided functions */
880 fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
881
882 return info;
883
75d8929e
NE		 884release_framebuf:
885 framebuffer_release(info);
886
c296d5f9
TP		 887alloc_fail:
888 vfree(vmem);
889
890 return NULL;
891}
892EXPORT_SYMBOL(fbtft_framebuffer_alloc);
893
894/**
895 * fbtft_framebuffer_release - frees up all memory used by the framebuffer
896 *
897 * @info: frame buffer info structure
898 *
899 */
900void fbtft_framebuffer_release(struct fb_info *info)
901{
902 fb_deferred_io_cleanup(info);
4b6dc179 903 vfree(info->screen_buffer);
c296d5f9
TP		 904 framebuffer_release(info);
905}
906EXPORT_SYMBOL(fbtft_framebuffer_release);
907
908/**
909 * fbtft_register_framebuffer - registers a tft frame buffer device
910 * @fb_info: frame buffer info structure
911 *
912 * Sets SPI driverdata if needed
913 * Requests needed gpios.
914 * Initializes display
915 * Updates display.
916 * Registers a frame buffer device @fb_info.
917 *
918 * Returns negative errno on error, or zero for success.
919 *
920 */
921int fbtft_register_framebuffer(struct fb_info *fb_info)
922{
923 int ret;
924 char text1[50] = "";
925 char text2[50] = "";
926 struct fbtft_par *par = fb_info->par;
927 struct spi_device *spi = par->spi;
928
929 /* sanity checks */
930 if (!par->fbtftops.init_display) {
931 dev_err(fb_info->device, "missing fbtftops.init_display()\n");
932 return -EINVAL;
933 }
934
935 if (spi)
936 spi_set_drvdata(spi, fb_info);
937 if (par->pdev)
938 platform_set_drvdata(par->pdev, fb_info);
939
940 ret = par->fbtftops.request_gpios(par);
941 if (ret < 0)
942 goto reg_fail;
943
944 if (par->fbtftops.verify_gpios) {
945 ret = par->fbtftops.verify_gpios(par);
946 if (ret < 0)
947 goto reg_fail;
948 }
949
950 ret = par->fbtftops.init_display(par);
951 if (ret < 0)
952 goto reg_fail;
953 if (par->fbtftops.set_var) {
954 ret = par->fbtftops.set_var(par);
955 if (ret < 0)
956 goto reg_fail;
957 }
958
959 /* update the entire display */
960 par->fbtftops.update_display(par, 0, par->info->var.yres - 1);
961
962 if (par->fbtftops.set_gamma && par->gamma.curves) {
963 ret = par->fbtftops.set_gamma(par, par->gamma.curves);
964 if (ret)
965 goto reg_fail;
966 }
967
968 if (par->fbtftops.register_backlight)
969 par->fbtftops.register_backlight(par);
970
971 ret = register_framebuffer(fb_info);
972 if (ret < 0)
973 goto reg_fail;
974
975 fbtft_sysfs_init(par);
976
18c61421 977 if (par->txbuf.buf && par->txbuf.len >= 1024)
7c3eaadd 978 sprintf(text1, ", %zu KiB buffer memory", par->txbuf.len >> 10);
c296d5f9
TP		 979 if (spi)
980 sprintf(text2, ", spi%d.%d at %d MHz", spi->master->bus_num,
94c0a544 981 spi->chip_select, spi->max_speed_hz / 1000000);
c296d5f9 982 dev_info(fb_info->dev,
4da2f4b7
GS		 983 "%s frame buffer, %dx%d, %d KiB video memory%s, fps=%lu%s\n",
984 fb_info->fix.id, fb_info->var.xres, fb_info->var.yres,
985 fb_info->fix.smem_len >> 10, text1,
986 HZ / fb_info->fbdefio->delay, text2);
c296d5f9
TP		 987
988#ifdef CONFIG_FB_BACKLIGHT
989 /* Turn on backlight if available */
990 if (fb_info->bl_dev) {
991 fb_info->bl_dev->props.power = FB_BLANK_UNBLANK;
992 fb_info->bl_dev->ops->update_status(fb_info->bl_dev);
993 }
994#endif
995
996 return 0;
997
998reg_fail:
999 if (par->fbtftops.unregister_backlight)
1000 par->fbtftops.unregister_backlight(par);
c296d5f9
TP		 1001
1002 return ret;
1003}
1004EXPORT_SYMBOL(fbtft_register_framebuffer);
1005
1006/**
1007 * fbtft_unregister_framebuffer - releases a tft frame buffer device
1008 * @fb_info: frame buffer info structure
1009 *
1010 * Frees SPI driverdata if needed
1011 * Frees gpios.
1012 * Unregisters frame buffer device.
1013 *
1014 */
1015int fbtft_unregister_framebuffer(struct fb_info *fb_info)
1016{
1017 struct fbtft_par *par = fb_info->par;
c296d5f9 1018
c296d5f9
TP		 1019 if (par->fbtftops.unregister_backlight)
1020 par->fbtftops.unregister_backlight(par);
1021 fbtft_sysfs_exit(par);
11107ffe 1022 return unregister_framebuffer(fb_info);
c296d5f9
TP		 1023}
1024EXPORT_SYMBOL(fbtft_unregister_framebuffer);
1025
1026#ifdef CONFIG_OF
1027/**
1028 * fbtft_init_display_dt() - Device Tree init_display() function
1029 * @par: Driver data
1030 *
1031 * Return: 0 if successful, negative if error
1032 */
1033static int fbtft_init_display_dt(struct fbtft_par *par)
1034{
1035 struct device_node *node = par->info->device->of_node;
1036 struct property *prop;
1037 const __be32 *p;
1038 u32 val;
1039 int buf[64], i, j;
c296d5f9 1040
c296d5f9
TP		 1041 if (!node)
1042 return -EINVAL;
1043
1044 prop = of_find_property(node, "init", NULL);
1045 p = of_prop_next_u32(prop, NULL, &val);
1046 if (!p)
1047 return -EINVAL;
dc4b2068
NT		 1048
1049 par->fbtftops.reset(par);
1050 if (par->gpio.cs != -1)
1051 gpio_set_value(par->gpio.cs, 0); /* Activate chip */
1052
c296d5f9
TP		 1053 while (p) {
1054 if (val & FBTFT_OF_INIT_CMD) {
1055 val &= 0xFFFF;
1056 i = 0;
1057 while (p && !(val & 0xFFFF0000)) {
1058 if (i > 63) {
1059 dev_err(par->info->device,
1060 "%s: Maximum register values exceeded\n",
1061 __func__);
1062 return -EINVAL;
1063 }
1064 buf[i++] = val;
1065 p = of_prop_next_u32(prop, p, &val);
1066 }
1067 /* make debug message */
c296d5f9 1068 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
4da2f4b7 1069 "init: write_register:\n");
e6ffd1ba
SM		 1070 for (j = 0; j < i; j++)
1071 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
1072 "buf[%d] = %02X\n", j, buf[j]);
c296d5f9
TP		 1073
1074 par->fbtftops.write_register(par, i,
1075 buf[0], buf[1], buf[2], buf[3],
1076 buf[4], buf[5], buf[6], buf[7],
1077 buf[8], buf[9], buf[10], buf[11],
1078 buf[12], buf[13], buf[14], buf[15],
1079 buf[16], buf[17], buf[18], buf[19],
1080 buf[20], buf[21], buf[22], buf[23],
1081 buf[24], buf[25], buf[26], buf[27],
1082 buf[28], buf[29], buf[30], buf[31],
1083 buf[32], buf[33], buf[34], buf[35],
1084 buf[36], buf[37], buf[38], buf[39],
1085 buf[40], buf[41], buf[42], buf[43],
1086 buf[44], buf[45], buf[46], buf[47],
1087 buf[48], buf[49], buf[50], buf[51],
1088 buf[52], buf[53], buf[54], buf[55],
1089 buf[56], buf[57], buf[58], buf[59],
1090 buf[60], buf[61], buf[62], buf[63]);
1091 } else if (val & FBTFT_OF_INIT_DELAY) {
1092 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
4da2f4b7 1093 "init: msleep(%u)\n", val & 0xFFFF);
c296d5f9
TP		 1094 msleep(val & 0xFFFF);
1095 p = of_prop_next_u32(prop, p, &val);
1096 } else {
1097 dev_err(par->info->device, "illegal init value 0x%X\n",
4da2f4b7 1098 val);
c296d5f9
TP		 1099 return -EINVAL;
1100 }
1101 }
1102
1103 return 0;
1104}
1105#endif
1106
1107/**
1108 * fbtft_init_display() - Generic init_display() function
1109 * @par: Driver data
1110 *
1111 * Uses par->init_sequence to do the initialization
1112 *
1113 * Return: 0 if successful, negative if error
1114 */
1115int fbtft_init_display(struct fbtft_par *par)
1116{
1117 int buf[64];
1118 char msg[128];
1119 char str[16];
1120 int i = 0;
1121 int j;
1122
c296d5f9
TP		 1123 /* sanity check */
1124 if (!par->init_sequence) {
1125 dev_err(par->info->device,
1126 "error: init_sequence is not set\n");
1127 return -EINVAL;
1128 }
1129
1130 /* make sure stop marker exists */
1131 for (i = 0; i < FBTFT_MAX_INIT_SEQUENCE; i++)
1132 if (par->init_sequence[i] == -3)
1133 break;
1134 if (i == FBTFT_MAX_INIT_SEQUENCE) {
1135 dev_err(par->info->device,
1136 "missing stop marker at end of init sequence\n");
1137 return -EINVAL;
1138 }
1139
1140 par->fbtftops.reset(par);
1141 if (par->gpio.cs != -1)
1142 gpio_set_value(par->gpio.cs, 0); /* Activate chip */
1143
1144 i = 0;
1145 while (i < FBTFT_MAX_INIT_SEQUENCE) {
1146 if (par->init_sequence[i] == -3) {
1147 /* done */
1148 return 0;
1149 }
1150 if (par->init_sequence[i] >= 0) {
1151 dev_err(par->info->device,
1152 "missing delimiter at position %d\n", i);
1153 return -EINVAL;
1154 }
94c0a544 1155 if (par->init_sequence[i + 1] < 0) {
c296d5f9
TP		 1156 dev_err(par->info->device,
1157 "missing value after delimiter %d at position %d\n",
1158 par->init_sequence[i], i);
1159 return -EINVAL;
1160 }
1161 switch (par->init_sequence[i]) {
1162 case -1:
1163 i++;
1164 /* make debug message */
1165 strcpy(msg, "");
1166 j = i + 1;
1167 while (par->init_sequence[j] >= 0) {
1168 sprintf(str, "0x%02X ", par->init_sequence[j]);
1169 strcat(msg, str);
1170 j++;
1171 }
1172 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
4da2f4b7
GS		 1173 "init: write(0x%02X) %s\n",
1174 par->init_sequence[i], msg);
c296d5f9
TP		 1175
1176 /* Write */
1177 j = 0;
1178 while (par->init_sequence[i] >= 0) {
1179 if (j > 63) {
1180 dev_err(par->info->device,
1181 "%s: Maximum register values exceeded\n",
1182 __func__);
1183 return -EINVAL;
1184 }
1185 buf[j++] = par->init_sequence[i++];
1186 }
1187 par->fbtftops.write_register(par, j,
1188 buf[0], buf[1], buf[2], buf[3],
1189 buf[4], buf[5], buf[6], buf[7],
1190 buf[8], buf[9], buf[10], buf[11],
1191 buf[12], buf[13], buf[14], buf[15],
1192 buf[16], buf[17], buf[18], buf[19],
1193 buf[20], buf[21], buf[22], buf[23],
1194 buf[24], buf[25], buf[26], buf[27],
1195 buf[28], buf[29], buf[30], buf[31],
1196 buf[32], buf[33], buf[34], buf[35],
1197 buf[36], buf[37], buf[38], buf[39],
1198 buf[40], buf[41], buf[42], buf[43],
1199 buf[44], buf[45], buf[46], buf[47],
1200 buf[48], buf[49], buf[50], buf[51],
1201 buf[52], buf[53], buf[54], buf[55],
1202 buf[56], buf[57], buf[58], buf[59],
1203 buf[60], buf[61], buf[62], buf[63]);
1204 break;
1205 case -2:
1206 i++;
1207 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
1208 "init: mdelay(%d)\n", par->init_sequence[i]);
1209 mdelay(par->init_sequence[i++]);
1210 break;
1211 default:
1212 dev_err(par->info->device,
1213 "unknown delimiter %d at position %d\n",
1214 par->init_sequence[i], i);
1215 return -EINVAL;
1216 }
1217 }
1218
1219 dev_err(par->info->device,
1220 "%s: something is wrong. Shouldn't get here.\n", __func__);
1221 return -EINVAL;
1222}
1223EXPORT_SYMBOL(fbtft_init_display);
1224
1225/**
1226 * fbtft_verify_gpios() - Generic verify_gpios() function
1227 * @par: Driver data
1228 *
1229 * Uses @spi, @pdev and @buswidth to determine which GPIOs is needed
1230 *
1231 * Return: 0 if successful, negative if error
1232 */
ed208436 1233static int fbtft_verify_gpios(struct fbtft_par *par)
c296d5f9 1234{
ad6d8812 1235 struct fbtft_platform_data *pdata = par->pdata;
c296d5f9
TP		 1236 int i;
1237
1238 fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);
1239
6ba67a5a 1240 if (pdata->display.buswidth != 9 && par->startbyte == 0 &&
c296d5f9
TP		 1241 par->gpio.dc < 0) {
1242 dev_err(par->info->device,
1243 "Missing info about 'dc' gpio. Aborting.\n");
1244 return -EINVAL;
1245 }
1246
1247 if (!par->pdev)
1248 return 0;
1249
1250 if (par->gpio.wr < 0) {
1251 dev_err(par->info->device, "Missing 'wr' gpio. Aborting.\n");
1252 return -EINVAL;
1253 }
1254 for (i = 0; i < pdata->display.buswidth; i++) {
1255 if (par->gpio.db[i] < 0) {
1256 dev_err(par->info->device,
1257 "Missing 'db%02d' gpio. Aborting.\n", i);
1258 return -EINVAL;
1259 }
1260 }
1261
1262 return 0;
1263}
1264
1265#ifdef CONFIG_OF
1266/* returns 0 if the property is not present */
1267static u32 fbtft_of_value(struct device_node *node, const char *propname)
1268{
1269 int ret;
1270 u32 val = 0;
1271
1272 ret = of_property_read_u32(node, propname, &val);
1273 if (ret == 0)
1274 pr_info("%s: %s = %u\n", __func__, propname, val);
1275
1276 return val;
1277}
1278
1279static struct fbtft_platform_data *fbtft_probe_dt(struct device *dev)
1280{
1281 struct device_node *node = dev->of_node;
1282 struct fbtft_platform_data *pdata;
1283
1284 if (!node) {
1285 dev_err(dev, "Missing platform data or DT\n");
1286 return ERR_PTR(-EINVAL);
1287 }
1288
1289 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1290 if (!pdata)
1291 return ERR_PTR(-ENOMEM);
1292
1293 pdata->display.width = fbtft_of_value(node, "width");
1294 pdata->display.height = fbtft_of_value(node, "height");
1295 pdata->display.regwidth = fbtft_of_value(node, "regwidth");
1296 pdata->display.buswidth = fbtft_of_value(node, "buswidth");
1297 pdata->display.backlight = fbtft_of_value(node, "backlight");
1298 pdata->display.bpp = fbtft_of_value(node, "bpp");
1299 pdata->display.debug = fbtft_of_value(node, "debug");
1300 pdata->rotate = fbtft_of_value(node, "rotate");
1301 pdata->bgr = of_property_read_bool(node, "bgr");
1302 pdata->fps = fbtft_of_value(node, "fps");
1303 pdata->txbuflen = fbtft_of_value(node, "txbuflen");
1304 pdata->startbyte = fbtft_of_value(node, "startbyte");
1305 of_property_read_string(node, "gamma", (const char **)&pdata->gamma);
1306
1307 if (of_find_property(node, "led-gpios", NULL))
1308 pdata->display.backlight = 1;
1309 if (of_find_property(node, "init", NULL))
1310 pdata->display.fbtftops.init_display = fbtft_init_display_dt;
1311 pdata->display.fbtftops.request_gpios = fbtft_request_gpios_dt;
1312
1313 return pdata;
1314}
1315#else
1316static struct fbtft_platform_data *fbtft_probe_dt(struct device *dev)
1317{
1318 dev_err(dev, "Missing platform data\n");
1319 return ERR_PTR(-EINVAL);
1320}
1321#endif
1322
1323/**
1324 * fbtft_probe_common() - Generic device probe() helper function
1325 * @display: Display properties
1326 * @sdev: SPI device
1327 * @pdev: Platform device
1328 *
1329 * Allocates, initializes and registers a framebuffer
1330 *
1331 * Either @sdev or @pdev should be NULL
1332 *
1333 * Return: 0 if successful, negative if error
1334 */
1335int fbtft_probe_common(struct fbtft_display *display,
1336 struct spi_device *sdev, struct platform_device *pdev)
1337{
1338 struct device *dev;
1339 struct fb_info *info;
1340 struct fbtft_par *par;
1341 struct fbtft_platform_data *pdata;
1342 int ret;
1343
1344 if (sdev)
1345 dev = &sdev->dev;
1346 else
1347 dev = &pdev->dev;
1348
1349 if (unlikely(display->debug & DEBUG_DRIVER_INIT_FUNCTIONS))
1350 dev_info(dev, "%s()\n", __func__);
1351
1352 pdata = dev->platform_data;
1353 if (!pdata) {
1354 pdata = fbtft_probe_dt(dev);
1355 if (IS_ERR(pdata))
1356 return PTR_ERR(pdata);
c296d5f9
TP		 1357 }
1358
ad6d8812 1359 info = fbtft_framebuffer_alloc(display, dev, pdata);
c296d5f9
TP		 1360 if (!info)
1361 return -ENOMEM;
1362
1363 par = info->par;
1364 par->spi = sdev;
1365 par->pdev = pdev;
1366
1367 if (display->buswidth == 0) {
1368 dev_err(dev, "buswidth is not set\n");
1369 return -EINVAL;
1370 }
1371
1372 /* write register functions */
1373 if (display->regwidth == 8 && display->buswidth == 8) {
1374 par->fbtftops.write_register = fbtft_write_reg8_bus8;
1375 } else
1376 if (display->regwidth == 8 && display->buswidth == 9 && par->spi) {
1377 par->fbtftops.write_register = fbtft_write_reg8_bus9;
1378 } else if (display->regwidth == 16 && display->buswidth == 8) {
1379 par->fbtftops.write_register = fbtft_write_reg16_bus8;
1380 } else if (display->regwidth == 16 && display->buswidth == 16) {
1381 par->fbtftops.write_register = fbtft_write_reg16_bus16;
1382 } else {
1383 dev_warn(dev,
1384 "no default functions for regwidth=%d and buswidth=%d\n",
1385 display->regwidth, display->buswidth);
1386 }
1387
1388 /* write_vmem() functions */
1389 if (display->buswidth == 8)
1390 par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
1391 else if (display->buswidth == 9)
1392 par->fbtftops.write_vmem = fbtft_write_vmem16_bus9;
1393 else if (display->buswidth == 16)
1394 par->fbtftops.write_vmem = fbtft_write_vmem16_bus16;
1395
1396 /* GPIO write() functions */
1397 if (par->pdev) {
1398 if (display->buswidth == 8)
1399 par->fbtftops.write = fbtft_write_gpio8_wr;
1400 else if (display->buswidth == 16)
1401 par->fbtftops.write = fbtft_write_gpio16_wr;
1402 }
1403
1404 /* 9-bit SPI setup */
1405 if (par->spi && display->buswidth == 9) {
cabb5b2a
SW		 1406 if (par->spi->master->bits_per_word_mask & SPI_BPW_MASK(9)) {
1407 par->spi->bits_per_word = 9;
1408 } else {
c296d5f9
TP		 1409 dev_warn(&par->spi->dev,
1410 "9-bit SPI not available, emulating using 8-bit.\n");
c296d5f9
TP		 1411 /* allocate buffer with room for dc bits */
1412 par->extra = devm_kzalloc(par->info->device,
1413 par->txbuf.len + (par->txbuf.len / 8) + 8,
1414 GFP_KERNEL);
1415 if (!par->extra) {
1416 ret = -ENOMEM;
1417 goto out_release;
1418 }
1419 par->fbtftops.write = fbtft_write_spi_emulate_9;
1420 }
1421 }
1422
1423 if (!par->fbtftops.verify_gpios)
1424 par->fbtftops.verify_gpios = fbtft_verify_gpios;
1425
1426 /* make sure we still use the driver provided functions */
1427 fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
1428
1429 /* use init_sequence if provided */
1430 if (par->init_sequence)
1431 par->fbtftops.init_display = fbtft_init_display;
1432
1433 /* use platform_data provided functions above all */
1434 fbtft_merge_fbtftops(&par->fbtftops, &pdata->display.fbtftops);
1435
1436 ret = fbtft_register_framebuffer(info);
1437 if (ret < 0)
1438 goto out_release;
1439
1440 return 0;
1441
1442out_release:
1443 fbtft_framebuffer_release(info);
1444
1445 return ret;
1446}
1447EXPORT_SYMBOL(fbtft_probe_common);
1448
1449/**
1450 * fbtft_remove_common() - Generic device remove() helper function
1451 * @dev: Device
1452 * @info: Framebuffer
1453 *
1454 * Unregisters and releases the framebuffer
1455 *
1456 * Return: 0 if successful, negative if error
1457 */
1458int fbtft_remove_common(struct device *dev, struct fb_info *info)
1459{
1460 struct fbtft_par *par;
1461
1462 if (!info)
1463 return -EINVAL;
1464 par = info->par;
1465 if (par)
1466 fbtft_par_dbg(DEBUG_DRIVER_INIT_FUNCTIONS, par,
4da2f4b7 1467 "%s()\n", __func__);
c296d5f9
TP		 1468 fbtft_unregister_framebuffer(info);
1469 fbtft_framebuffer_release(info);
1470
1471 return 0;
1472}
1473EXPORT_SYMBOL(fbtft_remove_common);
1474
1475MODULE_LICENSE("GPL");
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