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24c9d96d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
fabdbf2f BP |
2 | /*************************************************************************** |
3 | * Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org> * | |
4 | * * | |
5 | * Based on Logitech G13 driver (v0.4) * | |
6 | * Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu> * | |
7 | * * | |
fabdbf2f BP |
8 | ***************************************************************************/ |
9 | ||
10 | #include <linux/hid.h> | |
d1c60a03 | 11 | #include <linux/vmalloc.h> |
fabdbf2f BP |
12 | |
13 | #include <linux/fb.h> | |
14 | #include <linux/module.h> | |
15 | ||
16 | #include "hid-picolcd.h" | |
17 | ||
18 | /* Framebuffer | |
19 | * | |
20 | * The PicoLCD use a Topway LCD module of 256x64 pixel | |
21 | * This display area is tiled over 4 controllers with 8 tiles | |
22 | * each. Each tile has 8x64 pixel, each data byte representing | |
23 | * a 1-bit wide vertical line of the tile. | |
24 | * | |
25 | * The display can be updated at a tile granularity. | |
26 | * | |
27 | * Chip 1 Chip 2 Chip 3 Chip 4 | |
28 | * +----------------+----------------+----------------+----------------+ | |
29 | * | Tile 1 | Tile 1 | Tile 1 | Tile 1 | | |
30 | * +----------------+----------------+----------------+----------------+ | |
31 | * | Tile 2 | Tile 2 | Tile 2 | Tile 2 | | |
32 | * +----------------+----------------+----------------+----------------+ | |
33 | * ... | |
34 | * +----------------+----------------+----------------+----------------+ | |
35 | * | Tile 8 | Tile 8 | Tile 8 | Tile 8 | | |
36 | * +----------------+----------------+----------------+----------------+ | |
37 | */ | |
38 | #define PICOLCDFB_NAME "picolcdfb" | |
39 | #define PICOLCDFB_WIDTH (256) | |
40 | #define PICOLCDFB_HEIGHT (64) | |
41 | #define PICOLCDFB_SIZE (PICOLCDFB_WIDTH * PICOLCDFB_HEIGHT / 8) | |
42 | ||
43 | #define PICOLCDFB_UPDATE_RATE_LIMIT 10 | |
44 | #define PICOLCDFB_UPDATE_RATE_DEFAULT 2 | |
45 | ||
46 | /* Framebuffer visual structures */ | |
47 | static const struct fb_fix_screeninfo picolcdfb_fix = { | |
48 | .id = PICOLCDFB_NAME, | |
49 | .type = FB_TYPE_PACKED_PIXELS, | |
50 | .visual = FB_VISUAL_MONO01, | |
51 | .xpanstep = 0, | |
52 | .ypanstep = 0, | |
53 | .ywrapstep = 0, | |
54 | .line_length = PICOLCDFB_WIDTH / 8, | |
55 | .accel = FB_ACCEL_NONE, | |
56 | }; | |
57 | ||
58 | static const struct fb_var_screeninfo picolcdfb_var = { | |
59 | .xres = PICOLCDFB_WIDTH, | |
60 | .yres = PICOLCDFB_HEIGHT, | |
61 | .xres_virtual = PICOLCDFB_WIDTH, | |
62 | .yres_virtual = PICOLCDFB_HEIGHT, | |
63 | .width = 103, | |
64 | .height = 26, | |
65 | .bits_per_pixel = 1, | |
66 | .grayscale = 1, | |
67 | .red = { | |
68 | .offset = 0, | |
69 | .length = 1, | |
70 | .msb_right = 0, | |
71 | }, | |
72 | .green = { | |
73 | .offset = 0, | |
74 | .length = 1, | |
75 | .msb_right = 0, | |
76 | }, | |
77 | .blue = { | |
78 | .offset = 0, | |
79 | .length = 1, | |
80 | .msb_right = 0, | |
81 | }, | |
82 | .transp = { | |
83 | .offset = 0, | |
84 | .length = 0, | |
85 | .msb_right = 0, | |
86 | }, | |
87 | }; | |
88 | ||
89 | /* Send a given tile to PicoLCD */ | |
16048709 BP |
90 | static int picolcd_fb_send_tile(struct picolcd_data *data, u8 *vbitmap, |
91 | int chip, int tile) | |
fabdbf2f | 92 | { |
16048709 | 93 | struct hid_report *report1, *report2; |
fabdbf2f BP |
94 | unsigned long flags; |
95 | u8 *tdata; | |
96 | int i; | |
97 | ||
16048709 BP |
98 | report1 = picolcd_out_report(REPORT_LCD_CMD_DATA, data->hdev); |
99 | if (!report1 || report1->maxfield != 1) | |
100 | return -ENODEV; | |
101 | report2 = picolcd_out_report(REPORT_LCD_DATA, data->hdev); | |
102 | if (!report2 || report2->maxfield != 1) | |
fabdbf2f BP |
103 | return -ENODEV; |
104 | ||
105 | spin_lock_irqsave(&data->lock, flags); | |
16048709 BP |
106 | if ((data->status & PICOLCD_FAILED)) { |
107 | spin_unlock_irqrestore(&data->lock, flags); | |
108 | return -ENODEV; | |
109 | } | |
fabdbf2f BP |
110 | hid_set_field(report1->field[0], 0, chip << 2); |
111 | hid_set_field(report1->field[0], 1, 0x02); | |
112 | hid_set_field(report1->field[0], 2, 0x00); | |
113 | hid_set_field(report1->field[0], 3, 0x00); | |
114 | hid_set_field(report1->field[0], 4, 0xb8 | tile); | |
115 | hid_set_field(report1->field[0], 5, 0x00); | |
116 | hid_set_field(report1->field[0], 6, 0x00); | |
117 | hid_set_field(report1->field[0], 7, 0x40); | |
118 | hid_set_field(report1->field[0], 8, 0x00); | |
119 | hid_set_field(report1->field[0], 9, 0x00); | |
120 | hid_set_field(report1->field[0], 10, 32); | |
121 | ||
122 | hid_set_field(report2->field[0], 0, (chip << 2) | 0x01); | |
123 | hid_set_field(report2->field[0], 1, 0x00); | |
124 | hid_set_field(report2->field[0], 2, 0x00); | |
125 | hid_set_field(report2->field[0], 3, 32); | |
126 | ||
16048709 | 127 | tdata = vbitmap + (tile * 4 + chip) * 64; |
fabdbf2f BP |
128 | for (i = 0; i < 64; i++) |
129 | if (i < 32) | |
130 | hid_set_field(report1->field[0], 11 + i, tdata[i]); | |
131 | else | |
132 | hid_set_field(report2->field[0], 4 + i - 32, tdata[i]); | |
133 | ||
d8814272 BT |
134 | hid_hw_request(data->hdev, report1, HID_REQ_SET_REPORT); |
135 | hid_hw_request(data->hdev, report2, HID_REQ_SET_REPORT); | |
fabdbf2f BP |
136 | spin_unlock_irqrestore(&data->lock, flags); |
137 | return 0; | |
138 | } | |
139 | ||
140 | /* Translate a single tile*/ | |
141 | static int picolcd_fb_update_tile(u8 *vbitmap, const u8 *bitmap, int bpp, | |
142 | int chip, int tile) | |
143 | { | |
144 | int i, b, changed = 0; | |
145 | u8 tdata[64]; | |
146 | u8 *vdata = vbitmap + (tile * 4 + chip) * 64; | |
147 | ||
148 | if (bpp == 1) { | |
149 | for (b = 7; b >= 0; b--) { | |
150 | const u8 *bdata = bitmap + tile * 256 + chip * 8 + b * 32; | |
151 | for (i = 0; i < 64; i++) { | |
152 | tdata[i] <<= 1; | |
153 | tdata[i] |= (bdata[i/8] >> (i % 8)) & 0x01; | |
154 | } | |
155 | } | |
156 | } else if (bpp == 8) { | |
157 | for (b = 7; b >= 0; b--) { | |
158 | const u8 *bdata = bitmap + (tile * 256 + chip * 8 + b * 32) * 8; | |
159 | for (i = 0; i < 64; i++) { | |
160 | tdata[i] <<= 1; | |
161 | tdata[i] |= (bdata[i] & 0x80) ? 0x01 : 0x00; | |
162 | } | |
163 | } | |
164 | } else { | |
165 | /* Oops, we should never get here! */ | |
166 | WARN_ON(1); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | for (i = 0; i < 64; i++) | |
171 | if (tdata[i] != vdata[i]) { | |
172 | changed = 1; | |
173 | vdata[i] = tdata[i]; | |
174 | } | |
175 | return changed; | |
176 | } | |
177 | ||
178 | void picolcd_fb_refresh(struct picolcd_data *data) | |
179 | { | |
180 | if (data->fb_info) | |
181 | schedule_delayed_work(&data->fb_info->deferred_work, 0); | |
182 | } | |
183 | ||
184 | /* Reconfigure LCD display */ | |
185 | int picolcd_fb_reset(struct picolcd_data *data, int clear) | |
186 | { | |
187 | struct hid_report *report = picolcd_out_report(REPORT_LCD_CMD, data->hdev); | |
16048709 | 188 | struct picolcd_fb_data *fbdata = data->fb_info->par; |
fabdbf2f BP |
189 | int i, j; |
190 | unsigned long flags; | |
191 | static const u8 mapcmd[8] = { 0x00, 0x02, 0x00, 0x64, 0x3f, 0x00, 0x64, 0xc0 }; | |
192 | ||
193 | if (!report || report->maxfield != 1) | |
194 | return -ENODEV; | |
195 | ||
196 | spin_lock_irqsave(&data->lock, flags); | |
197 | for (i = 0; i < 4; i++) { | |
198 | for (j = 0; j < report->field[0]->maxusage; j++) | |
199 | if (j == 0) | |
200 | hid_set_field(report->field[0], j, i << 2); | |
201 | else if (j < sizeof(mapcmd)) | |
202 | hid_set_field(report->field[0], j, mapcmd[j]); | |
203 | else | |
204 | hid_set_field(report->field[0], j, 0); | |
d8814272 | 205 | hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT); |
fabdbf2f | 206 | } |
fabdbf2f BP |
207 | spin_unlock_irqrestore(&data->lock, flags); |
208 | ||
16048709 BP |
209 | if (clear) { |
210 | memset(fbdata->vbitmap, 0, PICOLCDFB_SIZE); | |
211 | memset(fbdata->bitmap, 0, PICOLCDFB_SIZE*fbdata->bpp); | |
fabdbf2f | 212 | } |
16048709 | 213 | fbdata->force = 1; |
fabdbf2f BP |
214 | |
215 | /* schedule first output of framebuffer */ | |
16048709 BP |
216 | if (fbdata->ready) |
217 | schedule_delayed_work(&data->fb_info->deferred_work, 0); | |
218 | else | |
219 | fbdata->ready = 1; | |
fabdbf2f BP |
220 | |
221 | return 0; | |
222 | } | |
223 | ||
224 | /* Update fb_vbitmap from the screen_base and send changed tiles to device */ | |
a93ab849 | 225 | static void picolcd_fb_update(struct fb_info *info) |
fabdbf2f BP |
226 | { |
227 | int chip, tile, n; | |
228 | unsigned long flags; | |
16048709 | 229 | struct picolcd_fb_data *fbdata = info->par; |
a93ab849 | 230 | struct picolcd_data *data; |
fabdbf2f | 231 | |
a93ab849 | 232 | mutex_lock(&info->lock); |
fabdbf2f | 233 | |
16048709 BP |
234 | spin_lock_irqsave(&fbdata->lock, flags); |
235 | if (!fbdata->ready && fbdata->picolcd) | |
236 | picolcd_fb_reset(fbdata->picolcd, 0); | |
237 | spin_unlock_irqrestore(&fbdata->lock, flags); | |
fabdbf2f BP |
238 | |
239 | /* | |
240 | * Translate the framebuffer into the format needed by the PicoLCD. | |
241 | * See display layout above. | |
242 | * Do this one tile after the other and push those tiles that changed. | |
243 | * | |
244 | * Wait for our IO to complete as otherwise we might flood the queue! | |
245 | */ | |
246 | n = 0; | |
247 | for (chip = 0; chip < 4; chip++) | |
16048709 BP |
248 | for (tile = 0; tile < 8; tile++) { |
249 | if (!fbdata->force && !picolcd_fb_update_tile( | |
250 | fbdata->vbitmap, fbdata->bitmap, | |
251 | fbdata->bpp, chip, tile)) | |
252 | continue; | |
253 | n += 2; | |
254 | if (n >= HID_OUTPUT_FIFO_SIZE / 2) { | |
255 | spin_lock_irqsave(&fbdata->lock, flags); | |
256 | data = fbdata->picolcd; | |
257 | spin_unlock_irqrestore(&fbdata->lock, flags); | |
258 | mutex_unlock(&info->lock); | |
259 | if (!data) | |
260 | return; | |
b7966a4d | 261 | hid_hw_wait(data->hdev); |
16048709 BP |
262 | mutex_lock(&info->lock); |
263 | n = 0; | |
fabdbf2f | 264 | } |
16048709 BP |
265 | spin_lock_irqsave(&fbdata->lock, flags); |
266 | data = fbdata->picolcd; | |
267 | spin_unlock_irqrestore(&fbdata->lock, flags); | |
268 | if (!data || picolcd_fb_send_tile(data, | |
269 | fbdata->vbitmap, chip, tile)) | |
270 | goto out; | |
271 | } | |
272 | fbdata->force = false; | |
a93ab849 | 273 | if (n) { |
16048709 BP |
274 | spin_lock_irqsave(&fbdata->lock, flags); |
275 | data = fbdata->picolcd; | |
276 | spin_unlock_irqrestore(&fbdata->lock, flags); | |
a93ab849 | 277 | mutex_unlock(&info->lock); |
16048709 | 278 | if (data) |
b7966a4d | 279 | hid_hw_wait(data->hdev); |
a93ab849 BP |
280 | return; |
281 | } | |
282 | out: | |
283 | mutex_unlock(&info->lock); | |
fabdbf2f BP |
284 | } |
285 | ||
286 | /* Stub to call the system default and update the image on the picoLCD */ | |
287 | static void picolcd_fb_fillrect(struct fb_info *info, | |
288 | const struct fb_fillrect *rect) | |
289 | { | |
290 | if (!info->par) | |
291 | return; | |
292 | sys_fillrect(info, rect); | |
293 | ||
294 | schedule_delayed_work(&info->deferred_work, 0); | |
295 | } | |
296 | ||
297 | /* Stub to call the system default and update the image on the picoLCD */ | |
298 | static void picolcd_fb_copyarea(struct fb_info *info, | |
299 | const struct fb_copyarea *area) | |
300 | { | |
301 | if (!info->par) | |
302 | return; | |
303 | sys_copyarea(info, area); | |
304 | ||
305 | schedule_delayed_work(&info->deferred_work, 0); | |
306 | } | |
307 | ||
308 | /* Stub to call the system default and update the image on the picoLCD */ | |
309 | static void picolcd_fb_imageblit(struct fb_info *info, const struct fb_image *image) | |
310 | { | |
311 | if (!info->par) | |
312 | return; | |
313 | sys_imageblit(info, image); | |
314 | ||
315 | schedule_delayed_work(&info->deferred_work, 0); | |
316 | } | |
317 | ||
318 | /* | |
319 | * this is the slow path from userspace. they can seek and write to | |
320 | * the fb. it's inefficient to do anything less than a full screen draw | |
321 | */ | |
322 | static ssize_t picolcd_fb_write(struct fb_info *info, const char __user *buf, | |
323 | size_t count, loff_t *ppos) | |
324 | { | |
325 | ssize_t ret; | |
326 | if (!info->par) | |
327 | return -ENODEV; | |
328 | ret = fb_sys_write(info, buf, count, ppos); | |
329 | if (ret >= 0) | |
330 | schedule_delayed_work(&info->deferred_work, 0); | |
331 | return ret; | |
332 | } | |
333 | ||
334 | static int picolcd_fb_blank(int blank, struct fb_info *info) | |
335 | { | |
fabdbf2f BP |
336 | /* We let fb notification do this for us via lcd/backlight device */ |
337 | return 0; | |
338 | } | |
339 | ||
340 | static void picolcd_fb_destroy(struct fb_info *info) | |
341 | { | |
16048709 BP |
342 | struct picolcd_fb_data *fbdata = info->par; |
343 | ||
9966c37c | 344 | /* make sure no work is deferred */ |
a93ab849 | 345 | fb_deferred_io_cleanup(info); |
fabdbf2f | 346 | |
16048709 BP |
347 | /* No thridparty should ever unregister our framebuffer! */ |
348 | WARN_ON(fbdata->picolcd != NULL); | |
349 | ||
9966c37c BP |
350 | vfree((u8 *)info->fix.smem_start); |
351 | framebuffer_release(info); | |
fabdbf2f BP |
352 | } |
353 | ||
354 | static int picolcd_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) | |
355 | { | |
356 | __u32 bpp = var->bits_per_pixel; | |
357 | __u32 activate = var->activate; | |
358 | ||
359 | /* only allow 1/8 bit depth (8-bit is grayscale) */ | |
360 | *var = picolcdfb_var; | |
361 | var->activate = activate; | |
362 | if (bpp >= 8) { | |
363 | var->bits_per_pixel = 8; | |
364 | var->red.length = 8; | |
365 | var->green.length = 8; | |
366 | var->blue.length = 8; | |
367 | } else { | |
368 | var->bits_per_pixel = 1; | |
369 | var->red.length = 1; | |
370 | var->green.length = 1; | |
371 | var->blue.length = 1; | |
372 | } | |
373 | return 0; | |
374 | } | |
375 | ||
376 | static int picolcd_set_par(struct fb_info *info) | |
377 | { | |
16048709 | 378 | struct picolcd_fb_data *fbdata = info->par; |
fabdbf2f | 379 | u8 *tmp_fb, *o_fb; |
16048709 | 380 | if (info->var.bits_per_pixel == fbdata->bpp) |
fabdbf2f BP |
381 | return 0; |
382 | /* switch between 1/8 bit depths */ | |
383 | if (info->var.bits_per_pixel != 1 && info->var.bits_per_pixel != 8) | |
384 | return -EINVAL; | |
385 | ||
16048709 | 386 | o_fb = fbdata->bitmap; |
6da2ec56 KC |
387 | tmp_fb = kmalloc_array(PICOLCDFB_SIZE, info->var.bits_per_pixel, |
388 | GFP_KERNEL); | |
fabdbf2f BP |
389 | if (!tmp_fb) |
390 | return -ENOMEM; | |
391 | ||
392 | /* translate FB content to new bits-per-pixel */ | |
393 | if (info->var.bits_per_pixel == 1) { | |
394 | int i, b; | |
395 | for (i = 0; i < PICOLCDFB_SIZE; i++) { | |
396 | u8 p = 0; | |
397 | for (b = 0; b < 8; b++) { | |
398 | p <<= 1; | |
399 | p |= o_fb[i*8+b] ? 0x01 : 0x00; | |
400 | } | |
401 | tmp_fb[i] = p; | |
402 | } | |
403 | memcpy(o_fb, tmp_fb, PICOLCDFB_SIZE); | |
404 | info->fix.visual = FB_VISUAL_MONO01; | |
405 | info->fix.line_length = PICOLCDFB_WIDTH / 8; | |
406 | } else { | |
407 | int i; | |
408 | memcpy(tmp_fb, o_fb, PICOLCDFB_SIZE); | |
409 | for (i = 0; i < PICOLCDFB_SIZE * 8; i++) | |
410 | o_fb[i] = tmp_fb[i/8] & (0x01 << (7 - i % 8)) ? 0xff : 0x00; | |
411 | info->fix.visual = FB_VISUAL_DIRECTCOLOR; | |
412 | info->fix.line_length = PICOLCDFB_WIDTH; | |
413 | } | |
414 | ||
415 | kfree(tmp_fb); | |
16048709 | 416 | fbdata->bpp = info->var.bits_per_pixel; |
fabdbf2f BP |
417 | return 0; |
418 | } | |
419 | ||
fabdbf2f BP |
420 | /* Note this can't be const because of struct fb_info definition */ |
421 | static struct fb_ops picolcdfb_ops = { | |
422 | .owner = THIS_MODULE, | |
423 | .fb_destroy = picolcd_fb_destroy, | |
fabdbf2f BP |
424 | .fb_read = fb_sys_read, |
425 | .fb_write = picolcd_fb_write, | |
426 | .fb_blank = picolcd_fb_blank, | |
427 | .fb_fillrect = picolcd_fb_fillrect, | |
428 | .fb_copyarea = picolcd_fb_copyarea, | |
429 | .fb_imageblit = picolcd_fb_imageblit, | |
430 | .fb_check_var = picolcd_fb_check_var, | |
431 | .fb_set_par = picolcd_set_par, | |
432 | }; | |
433 | ||
434 | ||
435 | /* Callback from deferred IO workqueue */ | |
436 | static void picolcd_fb_deferred_io(struct fb_info *info, struct list_head *pagelist) | |
437 | { | |
a93ab849 | 438 | picolcd_fb_update(info); |
fabdbf2f BP |
439 | } |
440 | ||
441 | static const struct fb_deferred_io picolcd_fb_defio = { | |
442 | .delay = HZ / PICOLCDFB_UPDATE_RATE_DEFAULT, | |
443 | .deferred_io = picolcd_fb_deferred_io, | |
444 | }; | |
445 | ||
446 | ||
447 | /* | |
448 | * The "fb_update_rate" sysfs attribute | |
449 | */ | |
450 | static ssize_t picolcd_fb_update_rate_show(struct device *dev, | |
451 | struct device_attribute *attr, char *buf) | |
452 | { | |
453 | struct picolcd_data *data = dev_get_drvdata(dev); | |
16048709 BP |
454 | struct picolcd_fb_data *fbdata = data->fb_info->par; |
455 | unsigned i, fb_update_rate = fbdata->update_rate; | |
fabdbf2f BP |
456 | size_t ret = 0; |
457 | ||
458 | for (i = 1; i <= PICOLCDFB_UPDATE_RATE_LIMIT; i++) | |
459 | if (ret >= PAGE_SIZE) | |
460 | break; | |
461 | else if (i == fb_update_rate) | |
462 | ret += snprintf(buf+ret, PAGE_SIZE-ret, "[%u] ", i); | |
463 | else | |
464 | ret += snprintf(buf+ret, PAGE_SIZE-ret, "%u ", i); | |
465 | if (ret > 0) | |
466 | buf[min(ret, (size_t)PAGE_SIZE)-1] = '\n'; | |
467 | return ret; | |
468 | } | |
469 | ||
470 | static ssize_t picolcd_fb_update_rate_store(struct device *dev, | |
471 | struct device_attribute *attr, const char *buf, size_t count) | |
472 | { | |
473 | struct picolcd_data *data = dev_get_drvdata(dev); | |
16048709 | 474 | struct picolcd_fb_data *fbdata = data->fb_info->par; |
fabdbf2f BP |
475 | int i; |
476 | unsigned u; | |
477 | ||
478 | if (count < 1 || count > 10) | |
479 | return -EINVAL; | |
480 | ||
481 | i = sscanf(buf, "%u", &u); | |
482 | if (i != 1) | |
483 | return -EINVAL; | |
484 | ||
485 | if (u > PICOLCDFB_UPDATE_RATE_LIMIT) | |
486 | return -ERANGE; | |
487 | else if (u == 0) | |
488 | u = PICOLCDFB_UPDATE_RATE_DEFAULT; | |
489 | ||
16048709 BP |
490 | fbdata->update_rate = u; |
491 | data->fb_info->fbdefio->delay = HZ / fbdata->update_rate; | |
fabdbf2f BP |
492 | return count; |
493 | } | |
494 | ||
f92201c3 | 495 | static DEVICE_ATTR(fb_update_rate, 0664, picolcd_fb_update_rate_show, |
fabdbf2f BP |
496 | picolcd_fb_update_rate_store); |
497 | ||
498 | /* initialize Framebuffer device */ | |
499 | int picolcd_init_framebuffer(struct picolcd_data *data) | |
500 | { | |
501 | struct device *dev = &data->hdev->dev; | |
502 | struct fb_info *info = NULL; | |
16048709 | 503 | struct picolcd_fb_data *fbdata = NULL; |
fabdbf2f | 504 | int i, error = -ENOMEM; |
fabdbf2f BP |
505 | u32 *palette; |
506 | ||
fabdbf2f | 507 | /* The extra memory is: |
fabdbf2f | 508 | * - 256*u32 for pseudo_palette |
9966c37c | 509 | * - struct fb_deferred_io |
fabdbf2f | 510 | */ |
9966c37c | 511 | info = framebuffer_alloc(256 * sizeof(u32) + |
16048709 BP |
512 | sizeof(struct fb_deferred_io) + |
513 | sizeof(struct picolcd_fb_data) + | |
514 | PICOLCDFB_SIZE, dev); | |
fabdbf2f BP |
515 | if (info == NULL) { |
516 | dev_err(dev, "failed to allocate a framebuffer\n"); | |
517 | goto err_nomem; | |
518 | } | |
519 | ||
9966c37c BP |
520 | info->fbdefio = info->par; |
521 | *info->fbdefio = picolcd_fb_defio; | |
16048709 BP |
522 | info->par += sizeof(struct fb_deferred_io); |
523 | palette = info->par; | |
524 | info->par += 256 * sizeof(u32); | |
fabdbf2f BP |
525 | for (i = 0; i < 256; i++) |
526 | palette[i] = i > 0 && i < 16 ? 0xff : 0; | |
527 | info->pseudo_palette = palette; | |
fabdbf2f BP |
528 | info->fbops = &picolcdfb_ops; |
529 | info->var = picolcdfb_var; | |
530 | info->fix = picolcdfb_fix; | |
531 | info->fix.smem_len = PICOLCDFB_SIZE*8; | |
fabdbf2f BP |
532 | info->flags = FBINFO_FLAG_DEFAULT; |
533 | ||
16048709 BP |
534 | fbdata = info->par; |
535 | spin_lock_init(&fbdata->lock); | |
536 | fbdata->picolcd = data; | |
537 | fbdata->update_rate = PICOLCDFB_UPDATE_RATE_DEFAULT; | |
538 | fbdata->bpp = picolcdfb_var.bits_per_pixel; | |
539 | fbdata->force = 1; | |
540 | fbdata->vbitmap = info->par + sizeof(struct picolcd_fb_data); | |
541 | fbdata->bitmap = vmalloc(PICOLCDFB_SIZE*8); | |
542 | if (fbdata->bitmap == NULL) { | |
543 | dev_err(dev, "can't get a free page for framebuffer\n"); | |
544 | goto err_nomem; | |
545 | } | |
546 | info->screen_base = (char __force __iomem *)fbdata->bitmap; | |
547 | info->fix.smem_start = (unsigned long)fbdata->bitmap; | |
548 | memset(fbdata->vbitmap, 0xff, PICOLCDFB_SIZE); | |
549 | data->fb_info = info; | |
550 | ||
fabdbf2f BP |
551 | error = picolcd_fb_reset(data, 1); |
552 | if (error) { | |
553 | dev_err(dev, "failed to configure display\n"); | |
554 | goto err_cleanup; | |
555 | } | |
16048709 | 556 | |
fabdbf2f BP |
557 | error = device_create_file(dev, &dev_attr_fb_update_rate); |
558 | if (error) { | |
559 | dev_err(dev, "failed to create sysfs attributes\n"); | |
560 | goto err_cleanup; | |
561 | } | |
16048709 | 562 | |
fabdbf2f | 563 | fb_deferred_io_init(info); |
fabdbf2f BP |
564 | error = register_framebuffer(info); |
565 | if (error) { | |
566 | dev_err(dev, "failed to register framebuffer\n"); | |
567 | goto err_sysfs; | |
568 | } | |
fabdbf2f BP |
569 | return 0; |
570 | ||
571 | err_sysfs: | |
fabdbf2f | 572 | device_remove_file(dev, &dev_attr_fb_update_rate); |
16048709 | 573 | fb_deferred_io_cleanup(info); |
fabdbf2f | 574 | err_cleanup: |
fabdbf2f BP |
575 | data->fb_info = NULL; |
576 | ||
577 | err_nomem: | |
16048709 BP |
578 | if (fbdata) |
579 | vfree(fbdata->bitmap); | |
fabdbf2f | 580 | framebuffer_release(info); |
fabdbf2f BP |
581 | return error; |
582 | } | |
583 | ||
584 | void picolcd_exit_framebuffer(struct picolcd_data *data) | |
585 | { | |
586 | struct fb_info *info = data->fb_info; | |
1cde501b | 587 | struct picolcd_fb_data *fbdata; |
16048709 | 588 | unsigned long flags; |
fabdbf2f | 589 | |
1cde501b BP |
590 | if (!info) |
591 | return; | |
592 | ||
fabdbf2f | 593 | device_remove_file(&data->hdev->dev, &dev_attr_fb_update_rate); |
1cde501b | 594 | fbdata = info->par; |
16048709 BP |
595 | |
596 | /* disconnect framebuffer from HID dev */ | |
597 | spin_lock_irqsave(&fbdata->lock, flags); | |
598 | fbdata->picolcd = NULL; | |
599 | spin_unlock_irqrestore(&fbdata->lock, flags); | |
600 | ||
601 | /* make sure there is no running update - thus that fbdata->picolcd | |
602 | * once obtained under lock is guaranteed not to get free() under | |
603 | * the feet of the deferred work */ | |
033d9959 | 604 | flush_delayed_work(&info->deferred_work); |
16048709 BP |
605 | |
606 | data->fb_info = NULL; | |
fabdbf2f | 607 | unregister_framebuffer(info); |
fabdbf2f | 608 | } |