Commit | Line | Data |
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59277b67 BT |
1 | /* |
2 | * udlfb.c -- Framebuffer driver for DisplayLink USB controller | |
3 | * | |
4 | * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it> | |
5 | * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com> | |
2469d5db | 6 | * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com> |
59277b67 BT |
7 | * |
8 | * This file is subject to the terms and conditions of the GNU General Public | |
9 | * License v2. See the file COPYING in the main directory of this archive for | |
10 | * more details. | |
11 | * | |
12 | * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven, | |
13 | * usb-skeleton by GregKH. | |
14 | * | |
15 | * Device-specific portions based on information from Displaylink, with work | |
16 | * from Florian Echtler, Henrik Bjerregaard Pedersen, and others. | |
17 | */ | |
88e58b1a RDI |
18 | |
19 | #include <linux/module.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/usb.h> | |
23 | #include <linux/uaccess.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/fb.h> | |
fb299002 | 26 | #include <linux/vmalloc.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
33077b8d BT |
28 | #include <linux/delay.h> |
29 | ||
88e58b1a RDI |
30 | #include "udlfb.h" |
31 | ||
59277b67 | 32 | static struct fb_fix_screeninfo dlfb_fix = { |
2469d5db | 33 | .id = "udlfb", |
1d31a9ee BT |
34 | .type = FB_TYPE_PACKED_PIXELS, |
35 | .visual = FB_VISUAL_TRUECOLOR, | |
36 | .xpanstep = 0, | |
37 | .ypanstep = 0, | |
38 | .ywrapstep = 0, | |
39 | .accel = FB_ACCEL_NONE, | |
59277b67 | 40 | }; |
88e58b1a | 41 | |
2469d5db BT |
42 | static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST | |
43 | #ifdef FBINFO_VIRTFB | |
44 | FBINFO_VIRTFB | | |
45 | #endif | |
46 | FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | | |
47 | FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; | |
48 | ||
cc403dc6 BT |
49 | /* |
50 | * There are many DisplayLink-based products, all with unique PIDs. We are able | |
51 | * to support all volume ones (circa 2009) with a single driver, so we match | |
52 | * globally on VID. TODO: Probe() needs to detect when we might be running | |
53 | * "future" chips, and bail on those, so a compatible driver can match. | |
54 | */ | |
55 | static struct usb_device_id id_table[] = { | |
56 | {.idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,}, | |
57 | {}, | |
58 | }; | |
59 | MODULE_DEVICE_TABLE(usb, id_table); | |
88e58b1a | 60 | |
d5ed5432 BT |
61 | /* module options */ |
62 | static int console; /* Optionally allow fbcon to consume first framebuffer */ | |
63 | static int fb_defio; /* Optionally enable experimental fb_defio mmap support */ | |
dd8015f1 | 64 | |
4a4854dd BT |
65 | /* dlfb keeps a list of urbs for efficient bulk transfers */ |
66 | static void dlfb_urb_completion(struct urb *urb); | |
67 | static struct urb *dlfb_get_urb(struct dlfb_data *dev); | |
68 | static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len); | |
69 | static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size); | |
70 | static void dlfb_free_urb_list(struct dlfb_data *dev); | |
71 | ||
59277b67 | 72 | /* |
bd80816b BT |
73 | * All DisplayLink bulk operations start with 0xAF, followed by specific code |
74 | * All operations are written to buffers which then later get sent to device | |
59277b67 | 75 | */ |
4574203f | 76 | static char *dlfb_set_register(char *buf, u8 reg, u8 val) |
88e58b1a | 77 | { |
1d31a9ee BT |
78 | *buf++ = 0xAF; |
79 | *buf++ = 0x20; | |
80 | *buf++ = reg; | |
81 | *buf++ = val; | |
82 | return buf; | |
59277b67 | 83 | } |
88e58b1a | 84 | |
4574203f | 85 | static char *dlfb_vidreg_lock(char *buf) |
59277b67 | 86 | { |
4574203f | 87 | return dlfb_set_register(buf, 0xFF, 0x00); |
59277b67 | 88 | } |
88e58b1a | 89 | |
4574203f | 90 | static char *dlfb_vidreg_unlock(char *buf) |
59277b67 | 91 | { |
4574203f | 92 | return dlfb_set_register(buf, 0xFF, 0xFF); |
59277b67 BT |
93 | } |
94 | ||
95 | /* | |
530f43a8 | 96 | * On/Off for driving the DisplayLink framebuffer to the display |
9825f70f BT |
97 | * 0x00 H and V sync on |
98 | * 0x01 H and V sync off (screen blank but powered) | |
99 | * 0x07 DPMS powerdown (requires modeset to come back) | |
59277b67 | 100 | */ |
530f43a8 | 101 | static char *dlfb_enable_hvsync(char *buf, bool enable) |
59277b67 | 102 | { |
530f43a8 BT |
103 | if (enable) |
104 | return dlfb_set_register(buf, 0x1F, 0x00); | |
105 | else | |
9825f70f | 106 | return dlfb_set_register(buf, 0x1F, 0x07); |
59277b67 BT |
107 | } |
108 | ||
4574203f | 109 | static char *dlfb_set_color_depth(char *buf, u8 selection) |
59277b67 | 110 | { |
4574203f | 111 | return dlfb_set_register(buf, 0x00, selection); |
59277b67 BT |
112 | } |
113 | ||
4574203f | 114 | static char *dlfb_set_base16bpp(char *wrptr, u32 base) |
59277b67 | 115 | { |
1d31a9ee | 116 | /* the base pointer is 16 bits wide, 0x20 is hi byte. */ |
4574203f BT |
117 | wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); |
118 | wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); | |
119 | return dlfb_set_register(wrptr, 0x22, base); | |
59277b67 BT |
120 | } |
121 | ||
bd80816b BT |
122 | /* |
123 | * DisplayLink HW has separate 16bpp and 8bpp framebuffers. | |
124 | * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer | |
125 | */ | |
4574203f | 126 | static char *dlfb_set_base8bpp(char *wrptr, u32 base) |
59277b67 | 127 | { |
4574203f BT |
128 | wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); |
129 | wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); | |
130 | return dlfb_set_register(wrptr, 0x28, base); | |
59277b67 BT |
131 | } |
132 | ||
4574203f | 133 | static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) |
59277b67 | 134 | { |
4574203f BT |
135 | wrptr = dlfb_set_register(wrptr, reg, value >> 8); |
136 | return dlfb_set_register(wrptr, reg+1, value); | |
59277b67 BT |
137 | } |
138 | ||
139 | /* | |
140 | * This is kind of weird because the controller takes some | |
141 | * register values in a different byte order than other registers. | |
142 | */ | |
4574203f | 143 | static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) |
59277b67 | 144 | { |
4574203f BT |
145 | wrptr = dlfb_set_register(wrptr, reg, value); |
146 | return dlfb_set_register(wrptr, reg+1, value >> 8); | |
59277b67 BT |
147 | } |
148 | ||
149 | /* | |
150 | * LFSR is linear feedback shift register. The reason we have this is | |
151 | * because the display controller needs to minimize the clock depth of | |
152 | * various counters used in the display path. So this code reverses the | |
153 | * provided value into the lfsr16 value by counting backwards to get | |
154 | * the value that needs to be set in the hardware comparator to get the | |
155 | * same actual count. This makes sense once you read above a couple of | |
156 | * times and think about it from a hardware perspective. | |
157 | */ | |
bd80816b | 158 | static u16 dlfb_lfsr16(u16 actual_count) |
59277b67 BT |
159 | { |
160 | u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ | |
161 | ||
162 | while (actual_count--) { | |
163 | lv = ((lv << 1) | | |
164 | (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) | |
165 | & 0xFFFF; | |
88e58b1a RDI |
166 | } |
167 | ||
59277b67 BT |
168 | return (u16) lv; |
169 | } | |
170 | ||
171 | /* | |
172 | * This does LFSR conversion on the value that is to be written. | |
173 | * See LFSR explanation above for more detail. | |
174 | */ | |
4574203f | 175 | static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) |
59277b67 | 176 | { |
bd80816b | 177 | return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); |
88e58b1a RDI |
178 | } |
179 | ||
59277b67 BT |
180 | /* |
181 | * This takes a standard fbdev screeninfo struct and all of its monitor mode | |
182 | * details and converts them into the DisplayLink equivalent register commands. | |
183 | */ | |
4574203f | 184 | static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) |
88e58b1a | 185 | { |
59277b67 BT |
186 | u16 xds, yds; |
187 | u16 xde, yde; | |
188 | u16 yec; | |
189 | ||
59277b67 BT |
190 | /* x display start */ |
191 | xds = var->left_margin + var->hsync_len; | |
4574203f | 192 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); |
59277b67 BT |
193 | /* x display end */ |
194 | xde = xds + var->xres; | |
4574203f | 195 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); |
59277b67 BT |
196 | |
197 | /* y display start */ | |
198 | yds = var->upper_margin + var->vsync_len; | |
4574203f | 199 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); |
59277b67 BT |
200 | /* y display end */ |
201 | yde = yds + var->yres; | |
4574203f | 202 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); |
59277b67 BT |
203 | |
204 | /* x end count is active + blanking - 1 */ | |
4574203f BT |
205 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, |
206 | xde + var->right_margin - 1); | |
59277b67 BT |
207 | |
208 | /* libdlo hardcodes hsync start to 1 */ | |
4574203f | 209 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); |
59277b67 BT |
210 | |
211 | /* hsync end is width of sync pulse + 1 */ | |
4574203f | 212 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); |
59277b67 BT |
213 | |
214 | /* hpixels is active pixels */ | |
4574203f | 215 | wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); |
88e58b1a | 216 | |
59277b67 BT |
217 | /* yendcount is vertical active + vertical blanking */ |
218 | yec = var->yres + var->upper_margin + var->lower_margin + | |
219 | var->vsync_len; | |
4574203f | 220 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); |
88e58b1a | 221 | |
59277b67 | 222 | /* libdlo hardcodes vsync start to 0 */ |
4574203f | 223 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); |
59277b67 BT |
224 | |
225 | /* vsync end is width of vsync pulse */ | |
4574203f | 226 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); |
59277b67 BT |
227 | |
228 | /* vpixels is active pixels */ | |
4574203f | 229 | wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); |
59277b67 BT |
230 | |
231 | /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ | |
4574203f BT |
232 | wrptr = dlfb_set_register_16be(wrptr, 0x1B, |
233 | 200*1000*1000/var->pixclock); | |
59277b67 BT |
234 | |
235 | return wrptr; | |
236 | } | |
237 | ||
238 | /* | |
239 | * This takes a standard fbdev screeninfo struct that was fetched or prepared | |
240 | * and then generates the appropriate command sequence that then drives the | |
241 | * display controller. | |
242 | */ | |
243 | static int dlfb_set_video_mode(struct dlfb_data *dev, | |
244 | struct fb_var_screeninfo *var) | |
245 | { | |
246 | char *buf; | |
247 | char *wrptr; | |
248 | int retval = 0; | |
249 | int writesize; | |
530f43a8 BT |
250 | struct urb *urb; |
251 | ||
252 | if (!atomic_read(&dev->usb_active)) | |
253 | return -EPERM; | |
59277b67 | 254 | |
530f43a8 BT |
255 | urb = dlfb_get_urb(dev); |
256 | if (!urb) | |
257 | return -ENOMEM; | |
2685cffa | 258 | |
530f43a8 | 259 | buf = (char *) urb->transfer_buffer; |
59277b67 BT |
260 | |
261 | /* | |
262 | * This first section has to do with setting the base address on the | |
263 | * controller * associated with the display. There are 2 base | |
264 | * pointers, currently, we only * use the 16 bpp segment. | |
265 | */ | |
4574203f BT |
266 | wrptr = dlfb_vidreg_lock(buf); |
267 | wrptr = dlfb_set_color_depth(wrptr, 0x00); | |
59277b67 | 268 | /* set base for 16bpp segment to 0 */ |
4574203f | 269 | wrptr = dlfb_set_base16bpp(wrptr, 0); |
59277b67 | 270 | /* set base for 8bpp segment to end of fb */ |
4574203f | 271 | wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len); |
59277b67 | 272 | |
4574203f | 273 | wrptr = dlfb_set_vid_cmds(wrptr, var); |
530f43a8 | 274 | wrptr = dlfb_enable_hvsync(wrptr, true); |
4574203f | 275 | wrptr = dlfb_vidreg_unlock(wrptr); |
59277b67 BT |
276 | |
277 | writesize = wrptr - buf; | |
278 | ||
530f43a8 | 279 | retval = dlfb_submit_urb(dev, urb, writesize); |
59277b67 | 280 | |
59277b67 BT |
281 | return retval; |
282 | } | |
283 | ||
4574203f | 284 | static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) |
88e58b1a RDI |
285 | { |
286 | unsigned long start = vma->vm_start; | |
287 | unsigned long size = vma->vm_end - vma->vm_start; | |
288 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
289 | unsigned long page, pos; | |
290 | ||
f05e0575 | 291 | if (offset + size > info->fix.smem_len) |
88e58b1a | 292 | return -EINVAL; |
88e58b1a RDI |
293 | |
294 | pos = (unsigned long)info->fix.smem_start + offset; | |
295 | ||
2685cffa BT |
296 | dl_notice("mmap() framebuffer addr:%lu size:%lu\n", |
297 | pos, size); | |
298 | ||
88e58b1a RDI |
299 | while (size > 0) { |
300 | page = vmalloc_to_pfn((void *)pos); | |
f05e0575 | 301 | if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) |
88e58b1a | 302 | return -EAGAIN; |
f05e0575 | 303 | |
88e58b1a RDI |
304 | start += PAGE_SIZE; |
305 | pos += PAGE_SIZE; | |
306 | if (size > PAGE_SIZE) | |
307 | size -= PAGE_SIZE; | |
308 | else | |
309 | size = 0; | |
310 | } | |
311 | ||
312 | vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */ | |
313 | return 0; | |
88e58b1a RDI |
314 | } |
315 | ||
530f43a8 BT |
316 | /* |
317 | * Trims identical data from front and back of line | |
318 | * Sets new front buffer address and width | |
319 | * And returns byte count of identical pixels | |
320 | * Assumes CPU natural alignment (unsigned long) | |
321 | * for back and front buffer ptrs and width | |
322 | */ | |
323 | static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) | |
7316bc55 | 324 | { |
530f43a8 BT |
325 | int j, k; |
326 | const unsigned long *back = (const unsigned long *) bback; | |
327 | const unsigned long *front = (const unsigned long *) *bfront; | |
328 | const int width = *width_bytes / sizeof(unsigned long); | |
329 | int identical = width; | |
330 | int start = width; | |
331 | int end = width; | |
332 | ||
333 | prefetch((void *) front); | |
334 | prefetch((void *) back); | |
335 | ||
336 | for (j = 0; j < width; j++) { | |
337 | if (back[j] != front[j]) { | |
338 | start = j; | |
339 | break; | |
340 | } | |
341 | } | |
7316bc55 | 342 | |
530f43a8 BT |
343 | for (k = width - 1; k > j; k--) { |
344 | if (back[k] != front[k]) { | |
345 | end = k+1; | |
346 | break; | |
347 | } | |
7316bc55 RDI |
348 | } |
349 | ||
530f43a8 BT |
350 | identical = start + (width - end); |
351 | *bfront = (u8 *) &front[start]; | |
352 | *width_bytes = (end - start) * sizeof(unsigned long); | |
353 | ||
354 | return identical * sizeof(unsigned long); | |
7316bc55 RDI |
355 | } |
356 | ||
357 | /* | |
3b7b31fa PM |
358 | * Render a command stream for an encoded horizontal line segment of pixels. |
359 | * | |
360 | * A command buffer holds several commands. | |
361 | * It always begins with a fresh command header | |
362 | * (the protocol doesn't require this, but we enforce it to allow | |
363 | * multiple buffers to be potentially encoded and sent in parallel). | |
364 | * A single command encodes one contiguous horizontal line of pixels | |
365 | * | |
366 | * The function relies on the client to do all allocation, so that | |
367 | * rendering can be done directly to output buffers (e.g. USB URBs). | |
368 | * The function fills the supplied command buffer, providing information | |
369 | * on where it left off, so the client may call in again with additional | |
370 | * buffers if the line will take several buffers to complete. | |
371 | * | |
372 | * A single command can transmit a maximum of 256 pixels, | |
373 | * regardless of the compression ratio (protocol design limit). | |
374 | * To the hardware, 0 for a size byte means 256 | |
2685cffa | 375 | * |
3b7b31fa PM |
376 | * Rather than 256 pixel commands which are either rl or raw encoded, |
377 | * the rlx command simply assumes alternating raw and rl spans within one cmd. | |
378 | * This has a slightly larger header overhead, but produces more even results. | |
379 | * It also processes all data (read and write) in a single pass. | |
380 | * Performance benchmarks of common cases show it having just slightly better | |
2685cffa | 381 | * compression than 256 pixel raw or rle commands, with similar CPU consumpion. |
3b7b31fa PM |
382 | * But for very rl friendly data, will compress not quite as well. |
383 | */ | |
530f43a8 BT |
384 | static void dlfb_compress_hline( |
385 | const uint16_t **pixel_start_ptr, | |
386 | const uint16_t *const pixel_end, | |
387 | uint32_t *device_address_ptr, | |
388 | uint8_t **command_buffer_ptr, | |
389 | const uint8_t *const cmd_buffer_end) | |
88e58b1a | 390 | { |
530f43a8 BT |
391 | const uint16_t *pixel = *pixel_start_ptr; |
392 | uint32_t dev_addr = *device_address_ptr; | |
393 | uint8_t *cmd = *command_buffer_ptr; | |
394 | const int bpp = 2; | |
395 | ||
396 | while ((pixel_end > pixel) && | |
397 | (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { | |
398 | uint8_t *raw_pixels_count_byte = 0; | |
399 | uint8_t *cmd_pixels_count_byte = 0; | |
400 | const uint16_t *raw_pixel_start = 0; | |
401 | const uint16_t *cmd_pixel_start, *cmd_pixel_end = 0; | |
530f43a8 BT |
402 | |
403 | prefetchw((void *) cmd); /* pull in one cache line at least */ | |
404 | ||
405 | *cmd++ = 0xAF; | |
406 | *cmd++ = 0x6B; | |
1572f91c BT |
407 | *cmd++ = (uint8_t) ((dev_addr >> 16) & 0xFF); |
408 | *cmd++ = (uint8_t) ((dev_addr >> 8) & 0xFF); | |
409 | *cmd++ = (uint8_t) ((dev_addr) & 0xFF); | |
530f43a8 BT |
410 | |
411 | cmd_pixels_count_byte = cmd++; /* we'll know this later */ | |
412 | cmd_pixel_start = pixel; | |
413 | ||
414 | raw_pixels_count_byte = cmd++; /* we'll know this later */ | |
415 | raw_pixel_start = pixel; | |
416 | ||
417 | cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1, | |
418 | min((int)(pixel_end - pixel), | |
419 | (int)(cmd_buffer_end - cmd) / bpp)); | |
420 | ||
421 | prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp); | |
422 | ||
423 | while (pixel < cmd_pixel_end) { | |
424 | const uint16_t * const repeating_pixel = pixel; | |
425 | ||
426 | *(uint16_t *)cmd = cpu_to_be16p(pixel); | |
427 | cmd += 2; | |
428 | pixel++; | |
429 | ||
430 | if (unlikely((pixel < cmd_pixel_end) && | |
431 | (*pixel == *repeating_pixel))) { | |
432 | /* go back and fill in raw pixel count */ | |
433 | *raw_pixels_count_byte = ((repeating_pixel - | |
434 | raw_pixel_start) + 1) & 0xFF; | |
435 | ||
436 | while ((pixel < cmd_pixel_end) | |
437 | && (*pixel == *repeating_pixel)) { | |
438 | pixel++; | |
88e58b1a | 439 | } |
59277b67 | 440 | |
530f43a8 BT |
441 | /* immediately after raw data is repeat byte */ |
442 | *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF; | |
59277b67 | 443 | |
530f43a8 BT |
444 | /* Then start another raw pixel span */ |
445 | raw_pixel_start = pixel; | |
446 | raw_pixels_count_byte = cmd++; | |
7316bc55 | 447 | } |
88e58b1a RDI |
448 | } |
449 | ||
530f43a8 BT |
450 | if (pixel > raw_pixel_start) { |
451 | /* finalize last RAW span */ | |
452 | *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF; | |
453 | } | |
88e58b1a | 454 | |
530f43a8 BT |
455 | *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; |
456 | dev_addr += (pixel - cmd_pixel_start) * bpp; | |
88e58b1a RDI |
457 | } |
458 | ||
530f43a8 BT |
459 | if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) { |
460 | /* Fill leftover bytes with no-ops */ | |
461 | if (cmd_buffer_end > cmd) | |
462 | memset(cmd, 0xAF, cmd_buffer_end - cmd); | |
463 | cmd = (uint8_t *) cmd_buffer_end; | |
7316bc55 | 464 | } |
88e58b1a | 465 | |
530f43a8 BT |
466 | *command_buffer_ptr = cmd; |
467 | *pixel_start_ptr = pixel; | |
468 | *device_address_ptr = dev_addr; | |
88e58b1a | 469 | |
530f43a8 | 470 | return; |
88e58b1a RDI |
471 | } |
472 | ||
530f43a8 BT |
473 | /* |
474 | * There are 3 copies of every pixel: The front buffer that the fbdev | |
475 | * client renders to, the actual framebuffer across the USB bus in hardware | |
476 | * (that we can only write to, slowly, and can never read), and (optionally) | |
477 | * our shadow copy that tracks what's been sent to that hardware buffer. | |
478 | */ | |
5bea1fbf | 479 | static int dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr, |
530f43a8 BT |
480 | const char *front, char **urb_buf_ptr, |
481 | u32 byte_offset, u32 byte_width, | |
482 | int *ident_ptr, int *sent_ptr) | |
88e58b1a | 483 | { |
530f43a8 BT |
484 | const u8 *line_start, *line_end, *next_pixel; |
485 | u32 dev_addr = dev->base16 + byte_offset; | |
486 | struct urb *urb = *urb_ptr; | |
487 | u8 *cmd = *urb_buf_ptr; | |
488 | u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; | |
489 | ||
490 | line_start = (u8 *) (front + byte_offset); | |
491 | next_pixel = line_start; | |
492 | line_end = next_pixel + byte_width; | |
493 | ||
494 | if (dev->backing_buffer) { | |
495 | int offset; | |
496 | const u8 *back_start = (u8 *) (dev->backing_buffer | |
497 | + byte_offset); | |
498 | ||
499 | *ident_ptr += dlfb_trim_hline(back_start, &next_pixel, | |
500 | &byte_width); | |
501 | ||
502 | offset = next_pixel - line_start; | |
503 | line_end = next_pixel + byte_width; | |
504 | dev_addr += offset; | |
505 | back_start += offset; | |
506 | line_start += offset; | |
507 | ||
508 | memcpy((char *)back_start, (char *) line_start, | |
509 | byte_width); | |
510 | } | |
88e58b1a | 511 | |
530f43a8 BT |
512 | while (next_pixel < line_end) { |
513 | ||
514 | dlfb_compress_hline((const uint16_t **) &next_pixel, | |
515 | (const uint16_t *) line_end, &dev_addr, | |
516 | (u8 **) &cmd, (u8 *) cmd_end); | |
517 | ||
518 | if (cmd >= cmd_end) { | |
519 | int len = cmd - (u8 *) urb->transfer_buffer; | |
520 | if (dlfb_submit_urb(dev, urb, len)) | |
5bea1fbf | 521 | return 1; /* lost pixels is set */ |
530f43a8 BT |
522 | *sent_ptr += len; |
523 | urb = dlfb_get_urb(dev); | |
524 | if (!urb) | |
5bea1fbf | 525 | return 1; /* lost_pixels is set */ |
530f43a8 BT |
526 | *urb_ptr = urb; |
527 | cmd = urb->transfer_buffer; | |
528 | cmd_end = &cmd[urb->transfer_buffer_length]; | |
88e58b1a | 529 | } |
88e58b1a RDI |
530 | } |
531 | ||
530f43a8 | 532 | *urb_buf_ptr = cmd; |
5bea1fbf BT |
533 | |
534 | return 0; | |
88e58b1a RDI |
535 | } |
536 | ||
530f43a8 BT |
537 | int dlfb_handle_damage(struct dlfb_data *dev, int x, int y, |
538 | int width, int height, char *data) | |
7316bc55 | 539 | { |
7316bc55 | 540 | int i, ret; |
530f43a8 BT |
541 | char *cmd; |
542 | cycles_t start_cycles, end_cycles; | |
543 | int bytes_sent = 0; | |
544 | int bytes_identical = 0; | |
545 | struct urb *urb; | |
546 | int aligned_x; | |
547 | ||
548 | start_cycles = get_cycles(); | |
549 | ||
550 | aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long)); | |
551 | width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long)); | |
552 | x = aligned_x; | |
553 | ||
554 | if ((width <= 0) || | |
555 | (x + width > dev->info->var.xres) || | |
556 | (y + height > dev->info->var.yres)) | |
557 | return -EINVAL; | |
7316bc55 | 558 | |
530f43a8 BT |
559 | if (!atomic_read(&dev->usb_active)) |
560 | return 0; | |
7316bc55 | 561 | |
530f43a8 BT |
562 | urb = dlfb_get_urb(dev); |
563 | if (!urb) | |
564 | return 0; | |
565 | cmd = urb->transfer_buffer; | |
7316bc55 | 566 | |
530f43a8 BT |
567 | for (i = y; i < y + height ; i++) { |
568 | const int line_offset = dev->info->fix.line_length * i; | |
569 | const int byte_offset = line_offset + (x * BPP); | |
7316bc55 | 570 | |
5bea1fbf BT |
571 | if (dlfb_render_hline(dev, &urb, |
572 | (char *) dev->info->fix.smem_start, | |
2685cffa | 573 | &cmd, byte_offset, width * BPP, |
5bea1fbf BT |
574 | &bytes_identical, &bytes_sent)) |
575 | goto error; | |
7316bc55 RDI |
576 | } |
577 | ||
530f43a8 BT |
578 | if (cmd > (char *) urb->transfer_buffer) { |
579 | /* Send partial buffer remaining before exiting */ | |
580 | int len = cmd - (char *) urb->transfer_buffer; | |
581 | ret = dlfb_submit_urb(dev, urb, len); | |
582 | bytes_sent += len; | |
583 | } else | |
584 | dlfb_urb_completion(urb); | |
585 | ||
5bea1fbf | 586 | error: |
530f43a8 BT |
587 | atomic_add(bytes_sent, &dev->bytes_sent); |
588 | atomic_add(bytes_identical, &dev->bytes_identical); | |
589 | atomic_add(width*height*2, &dev->bytes_rendered); | |
590 | end_cycles = get_cycles(); | |
591 | atomic_add(((unsigned int) ((end_cycles - start_cycles) | |
592 | >> 10)), /* Kcycles */ | |
593 | &dev->cpu_kcycles_used); | |
7316bc55 | 594 | |
530f43a8 | 595 | return 0; |
7316bc55 RDI |
596 | } |
597 | ||
d46ecb9f BT |
598 | static ssize_t dlfb_ops_read(struct fb_info *info, char __user *buf, |
599 | size_t count, loff_t *ppos) | |
600 | { | |
601 | ssize_t result = -ENOSYS; | |
602 | ||
603 | #if defined CONFIG_FB_SYS_FOPS || defined CONFIG_FB_SYS_FOPS_MODULE | |
604 | result = fb_sys_read(info, buf, count, ppos); | |
605 | #endif | |
606 | ||
607 | return result; | |
608 | } | |
609 | ||
610 | /* | |
611 | * Path triggered by usermode clients who write to filesystem | |
612 | * e.g. cat filename > /dev/fb1 | |
613 | * Not used by X Windows or text-mode console. But useful for testing. | |
614 | * Slow because of extra copy and we must assume all pixels dirty. | |
615 | */ | |
616 | static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf, | |
617 | size_t count, loff_t *ppos) | |
618 | { | |
619 | ssize_t result = -ENOSYS; | |
620 | struct dlfb_data *dev = info->par; | |
621 | u32 offset = (u32) *ppos; | |
622 | ||
623 | #if defined CONFIG_FB_SYS_FOPS || defined CONFIG_FB_SYS_FOPS_MODULE | |
624 | ||
625 | result = fb_sys_write(info, buf, count, ppos); | |
626 | ||
627 | if (result > 0) { | |
628 | int start = max((int)(offset / info->fix.line_length) - 1, 0); | |
629 | int lines = min((u32)((result / info->fix.line_length) + 1), | |
630 | (u32)info->var.yres); | |
631 | ||
632 | dlfb_handle_damage(dev, 0, start, info->var.xres, | |
633 | lines, info->screen_base); | |
634 | } | |
635 | #endif | |
636 | ||
637 | return result; | |
638 | } | |
639 | ||
530f43a8 BT |
640 | /* hardware has native COPY command (see libdlo), but not worth it for fbcon */ |
641 | static void dlfb_ops_copyarea(struct fb_info *info, | |
642 | const struct fb_copyarea *area) | |
88e58b1a | 643 | { |
88e58b1a | 644 | |
530f43a8 | 645 | struct dlfb_data *dev = info->par; |
88e58b1a | 646 | |
530f43a8 | 647 | #if defined CONFIG_FB_SYS_COPYAREA || defined CONFIG_FB_SYS_COPYAREA_MODULE |
88e58b1a | 648 | |
530f43a8 | 649 | sys_copyarea(info, area); |
88e58b1a | 650 | |
530f43a8 BT |
651 | dlfb_handle_damage(dev, area->dx, area->dy, |
652 | area->width, area->height, info->screen_base); | |
653 | #endif | |
88e58b1a | 654 | |
530f43a8 | 655 | } |
88e58b1a | 656 | |
530f43a8 BT |
657 | static void dlfb_ops_imageblit(struct fb_info *info, |
658 | const struct fb_image *image) | |
659 | { | |
660 | struct dlfb_data *dev = info->par; | |
88e58b1a | 661 | |
530f43a8 | 662 | #if defined CONFIG_FB_SYS_IMAGEBLIT || defined CONFIG_FB_SYS_IMAGEBLIT_MODULE |
88e58b1a | 663 | |
530f43a8 | 664 | sys_imageblit(info, image); |
88e58b1a | 665 | |
530f43a8 BT |
666 | dlfb_handle_damage(dev, image->dx, image->dy, |
667 | image->width, image->height, info->screen_base); | |
88e58b1a | 668 | |
530f43a8 | 669 | #endif |
88e58b1a | 670 | |
88e58b1a RDI |
671 | } |
672 | ||
530f43a8 BT |
673 | static void dlfb_ops_fillrect(struct fb_info *info, |
674 | const struct fb_fillrect *rect) | |
88e58b1a | 675 | { |
88e58b1a RDI |
676 | struct dlfb_data *dev = info->par; |
677 | ||
530f43a8 | 678 | #if defined CONFIG_FB_SYS_FILLRECT || defined CONFIG_FB_SYS_FILLRECT_MODULE |
88e58b1a | 679 | |
530f43a8 | 680 | sys_fillrect(info, rect); |
88e58b1a | 681 | |
530f43a8 BT |
682 | dlfb_handle_damage(dev, rect->dx, rect->dy, rect->width, |
683 | rect->height, info->screen_base); | |
684 | #endif | |
88e58b1a | 685 | |
88e58b1a RDI |
686 | } |
687 | ||
d5ed5432 BT |
688 | #ifdef CONFIG_FB_DEFERRED_IO |
689 | /* | |
690 | * NOTE: fb_defio.c is holding info->fbdefio.mutex | |
691 | * Touching ANY framebuffer memory that triggers a page fault | |
692 | * in fb_defio will cause a deadlock, when it also tries to | |
693 | * grab the same mutex. | |
694 | */ | |
695 | static void dlfb_dpy_deferred_io(struct fb_info *info, | |
696 | struct list_head *pagelist) | |
697 | { | |
698 | struct page *cur; | |
699 | struct fb_deferred_io *fbdefio = info->fbdefio; | |
700 | struct dlfb_data *dev = info->par; | |
701 | struct urb *urb; | |
702 | char *cmd; | |
703 | cycles_t start_cycles, end_cycles; | |
704 | int bytes_sent = 0; | |
705 | int bytes_identical = 0; | |
706 | int bytes_rendered = 0; | |
707 | ||
708 | if (!fb_defio) | |
709 | return; | |
710 | ||
711 | if (!atomic_read(&dev->usb_active)) | |
712 | return; | |
713 | ||
714 | start_cycles = get_cycles(); | |
715 | ||
716 | urb = dlfb_get_urb(dev); | |
717 | if (!urb) | |
718 | return; | |
719 | ||
720 | cmd = urb->transfer_buffer; | |
721 | ||
722 | /* walk the written page list and render each to device */ | |
723 | list_for_each_entry(cur, &fbdefio->pagelist, lru) { | |
724 | ||
5bea1fbf | 725 | if (dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start, |
d5ed5432 | 726 | &cmd, cur->index << PAGE_SHIFT, |
5bea1fbf BT |
727 | PAGE_SIZE, &bytes_identical, &bytes_sent)) |
728 | goto error; | |
d5ed5432 BT |
729 | bytes_rendered += PAGE_SIZE; |
730 | } | |
731 | ||
732 | if (cmd > (char *) urb->transfer_buffer) { | |
733 | /* Send partial buffer remaining before exiting */ | |
734 | int len = cmd - (char *) urb->transfer_buffer; | |
735 | dlfb_submit_urb(dev, urb, len); | |
736 | bytes_sent += len; | |
737 | } else | |
738 | dlfb_urb_completion(urb); | |
739 | ||
5bea1fbf | 740 | error: |
d5ed5432 BT |
741 | atomic_add(bytes_sent, &dev->bytes_sent); |
742 | atomic_add(bytes_identical, &dev->bytes_identical); | |
743 | atomic_add(bytes_rendered, &dev->bytes_rendered); | |
744 | end_cycles = get_cycles(); | |
745 | atomic_add(((unsigned int) ((end_cycles - start_cycles) | |
746 | >> 10)), /* Kcycles */ | |
747 | &dev->cpu_kcycles_used); | |
748 | } | |
749 | ||
750 | #endif | |
751 | ||
18dffdf8 | 752 | static int dlfb_get_edid(struct dlfb_data *dev, char *edid, int len) |
7d9485e2 BT |
753 | { |
754 | int i; | |
755 | int ret; | |
18dffdf8 | 756 | char *rbuf; |
7d9485e2 | 757 | |
18dffdf8 BT |
758 | rbuf = kmalloc(2, GFP_KERNEL); |
759 | if (!rbuf) | |
760 | return 0; | |
761 | ||
762 | for (i = 0; i < len; i++) { | |
7d9485e2 BT |
763 | ret = usb_control_msg(dev->udev, |
764 | usb_rcvctrlpipe(dev->udev, 0), (0x02), | |
765 | (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2, | |
18dffdf8 BT |
766 | HZ); |
767 | if (ret < 1) { | |
768 | dl_err("Read EDID byte %d failed err %x\n", i, ret); | |
769 | i--; | |
770 | break; | |
771 | } | |
772 | edid[i] = rbuf[1]; | |
7d9485e2 | 773 | } |
18dffdf8 BT |
774 | |
775 | kfree(rbuf); | |
776 | ||
777 | return i; | |
7d9485e2 BT |
778 | } |
779 | ||
4574203f | 780 | static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd, |
530f43a8 | 781 | unsigned long arg) |
88e58b1a | 782 | { |
530f43a8 BT |
783 | |
784 | struct dlfb_data *dev = info->par; | |
7316bc55 | 785 | struct dloarea *area = NULL; |
88e58b1a | 786 | |
530f43a8 BT |
787 | if (!atomic_read(&dev->usb_active)) |
788 | return 0; | |
789 | ||
790 | /* TODO: Update X server to get this from sysfs instead */ | |
791 | if (cmd == DLFB_IOCTL_RETURN_EDID) { | |
7316bc55 | 792 | char *edid = (char *)arg; |
18dffdf8 | 793 | if (copy_to_user(edid, dev->edid, dev->edid_size)) |
7316bc55 | 794 | return -EFAULT; |
7316bc55 RDI |
795 | return 0; |
796 | } | |
797 | ||
530f43a8 BT |
798 | /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ |
799 | if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { | |
88e58b1a | 800 | |
5bea1fbf BT |
801 | /* |
802 | * If we have a damage-aware client, turn fb_defio "off" | |
803 | * To avoid perf imact of unecessary page fault handling. | |
804 | * Done by resetting the delay for this fb_info to a very | |
805 | * long period. Pages will become writable and stay that way. | |
806 | * Reset to normal value when all clients have closed this fb. | |
807 | */ | |
808 | if (info->fbdefio) | |
809 | info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE; | |
810 | ||
88e58b1a RDI |
811 | area = (struct dloarea *)arg; |
812 | ||
813 | if (area->x < 0) | |
814 | area->x = 0; | |
815 | ||
816 | if (area->x > info->var.xres) | |
817 | area->x = info->var.xres; | |
818 | ||
819 | if (area->y < 0) | |
820 | area->y = 0; | |
821 | ||
822 | if (area->y > info->var.yres) | |
823 | area->y = info->var.yres; | |
824 | ||
530f43a8 | 825 | dlfb_handle_damage(dev, area->x, area->y, area->w, area->h, |
88e58b1a RDI |
826 | info->screen_base); |
827 | } | |
7316bc55 | 828 | |
88e58b1a RDI |
829 | return 0; |
830 | } | |
831 | ||
f05e0575 | 832 | /* taken from vesafb */ |
88e58b1a | 833 | static int |
4574203f | 834 | dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green, |
88e58b1a RDI |
835 | unsigned blue, unsigned transp, struct fb_info *info) |
836 | { | |
837 | int err = 0; | |
838 | ||
839 | if (regno >= info->cmap.len) | |
840 | return 1; | |
841 | ||
842 | if (regno < 16) { | |
843 | if (info->var.red.offset == 10) { | |
844 | /* 1:5:5:5 */ | |
845 | ((u32 *) (info->pseudo_palette))[regno] = | |
846 | ((red & 0xf800) >> 1) | | |
847 | ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); | |
848 | } else { | |
849 | /* 0:5:6:5 */ | |
850 | ((u32 *) (info->pseudo_palette))[regno] = | |
851 | ((red & 0xf800)) | | |
852 | ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); | |
853 | } | |
854 | } | |
855 | ||
856 | return err; | |
857 | } | |
858 | ||
3e8f3d6f BT |
859 | /* |
860 | * It's common for several clients to have framebuffer open simultaneously. | |
861 | * e.g. both fbcon and X. Makes things interesting. | |
33077b8d | 862 | * Assumes caller is holding info->lock (for open and release at least) |
3e8f3d6f BT |
863 | */ |
864 | static int dlfb_ops_open(struct fb_info *info, int user) | |
865 | { | |
866 | struct dlfb_data *dev = info->par; | |
867 | ||
d5ed5432 BT |
868 | /* |
869 | * fbcon aggressively connects to first framebuffer it finds, | |
870 | * preventing other clients (X) from working properly. Usually | |
871 | * not what the user wants. Fail by default with option to enable. | |
872 | */ | |
873 | if ((user == 0) & (!console)) | |
874 | return -EBUSY; | |
3e8f3d6f | 875 | |
33077b8d BT |
876 | /* If the USB device is gone, we don't accept new opens */ |
877 | if (dev->virtualized) | |
878 | return -ENODEV; | |
3e8f3d6f BT |
879 | |
880 | dev->fb_count++; | |
881 | ||
33077b8d BT |
882 | kref_get(&dev->kref); |
883 | ||
3e8f3d6f | 884 | #ifdef CONFIG_FB_DEFERRED_IO |
d5ed5432 | 885 | if (fb_defio && (info->fbdefio == NULL)) { |
5bea1fbf BT |
886 | /* enable defio at last moment if not disabled by client */ |
887 | ||
888 | struct fb_deferred_io *fbdefio; | |
889 | ||
890 | fbdefio = kmalloc(GFP_KERNEL, sizeof(struct fb_deferred_io)); | |
891 | ||
892 | if (fbdefio) { | |
893 | fbdefio->delay = DL_DEFIO_WRITE_DELAY; | |
894 | fbdefio->deferred_io = dlfb_dpy_deferred_io; | |
895 | } | |
896 | ||
897 | info->fbdefio = fbdefio; | |
3e8f3d6f BT |
898 | fb_deferred_io_init(info); |
899 | } | |
900 | #endif | |
901 | ||
902 | dl_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n", | |
903 | info->node, user, info, dev->fb_count); | |
904 | ||
88e58b1a RDI |
905 | return 0; |
906 | } | |
907 | ||
4a4854dd BT |
908 | /* |
909 | * Called when all client interfaces to start transactions have been disabled, | |
910 | * and all references to our device instance (dlfb_data) are released. | |
911 | * Every transaction must have a reference, so we know are fully spun down | |
912 | */ | |
33077b8d | 913 | static void dlfb_free(struct kref *kref) |
4a4854dd BT |
914 | { |
915 | struct dlfb_data *dev = container_of(kref, struct dlfb_data, kref); | |
916 | ||
33077b8d BT |
917 | /* this function will wait for all in-flight urbs to complete */ |
918 | if (dev->urbs.count > 0) | |
919 | dlfb_free_urb_list(dev); | |
920 | ||
4a4854dd BT |
921 | if (dev->backing_buffer) |
922 | vfree(dev->backing_buffer); | |
923 | ||
33077b8d BT |
924 | kfree(dev->edid); |
925 | ||
926 | dl_warn("freeing dlfb_data %p\n", dev); | |
3e8f3d6f | 927 | |
4a4854dd BT |
928 | kfree(dev); |
929 | } | |
930 | ||
5bea1fbf BT |
931 | static void dlfb_release_urb_work(struct work_struct *work) |
932 | { | |
933 | struct urb_node *unode = container_of(work, struct urb_node, | |
934 | release_urb_work.work); | |
935 | ||
936 | up(&unode->dev->urbs.limit_sem); | |
937 | } | |
33077b8d BT |
938 | |
939 | static void dlfb_free_framebuffer_work(struct work_struct *work) | |
2469d5db | 940 | { |
33077b8d BT |
941 | struct dlfb_data *dev = container_of(work, struct dlfb_data, |
942 | free_framebuffer_work.work); | |
943 | struct fb_info *info = dev->info; | |
944 | int node = info->node; | |
945 | ||
946 | unregister_framebuffer(info); | |
2469d5db BT |
947 | |
948 | if (info->cmap.len != 0) | |
949 | fb_dealloc_cmap(&info->cmap); | |
950 | if (info->monspecs.modedb) | |
951 | fb_destroy_modedb(info->monspecs.modedb); | |
952 | if (info->screen_base) | |
953 | vfree(info->screen_base); | |
954 | ||
955 | fb_destroy_modelist(&info->modelist); | |
956 | ||
33077b8d BT |
957 | dev->info = 0; |
958 | ||
959 | /* Assume info structure is freed after this point */ | |
2469d5db BT |
960 | framebuffer_release(info); |
961 | ||
33077b8d BT |
962 | dl_warn("fb_info for /dev/fb%d has been freed\n", node); |
963 | ||
964 | /* ref taken in probe() as part of registering framebfufer */ | |
965 | kref_put(&dev->kref, dlfb_free); | |
966 | } | |
967 | ||
968 | /* | |
969 | * Assumes caller is holding info->lock mutex (for open and release at least) | |
970 | */ | |
971 | static int dlfb_ops_release(struct fb_info *info, int user) | |
972 | { | |
973 | struct dlfb_data *dev = info->par; | |
974 | ||
975 | dev->fb_count--; | |
976 | ||
977 | /* We can't free fb_info here - fbmem will touch it when we return */ | |
978 | if (dev->virtualized && (dev->fb_count == 0)) | |
979 | schedule_delayed_work(&dev->free_framebuffer_work, HZ); | |
980 | ||
981 | #ifdef CONFIG_FB_DEFERRED_IO | |
982 | if ((dev->fb_count == 0) && (info->fbdefio)) { | |
983 | fb_deferred_io_cleanup(info); | |
984 | kfree(info->fbdefio); | |
985 | info->fbdefio = NULL; | |
986 | info->fbops->fb_mmap = dlfb_ops_mmap; | |
987 | } | |
988 | #endif | |
989 | ||
990 | dl_warn("released /dev/fb%d user=%d count=%d\n", | |
991 | info->node, user, dev->fb_count); | |
992 | ||
993 | kref_put(&dev->kref, dlfb_free); | |
994 | ||
995 | return 0; | |
2469d5db BT |
996 | } |
997 | ||
7d9485e2 BT |
998 | /* |
999 | * Check whether a video mode is supported by the DisplayLink chip | |
1000 | * We start from monitor's modes, so don't need to filter that here | |
1001 | */ | |
1002 | static int dlfb_is_valid_mode(struct fb_videomode *mode, | |
1003 | struct fb_info *info) | |
1004 | { | |
1005 | struct dlfb_data *dev = info->par; | |
1006 | ||
18dffdf8 BT |
1007 | if (mode->xres * mode->yres > dev->sku_pixel_limit) { |
1008 | dl_warn("%dx%d beyond chip capabilities\n", | |
1009 | mode->xres, mode->yres); | |
7d9485e2 | 1010 | return 0; |
18dffdf8 BT |
1011 | } |
1012 | ||
1013 | dl_info("%dx%d valid mode\n", mode->xres, mode->yres); | |
7d9485e2 BT |
1014 | |
1015 | return 1; | |
1016 | } | |
1017 | ||
1018 | static void dlfb_var_color_format(struct fb_var_screeninfo *var) | |
1019 | { | |
1020 | const struct fb_bitfield red = { 11, 5, 0 }; | |
1021 | const struct fb_bitfield green = { 5, 6, 0 }; | |
1022 | const struct fb_bitfield blue = { 0, 5, 0 }; | |
1023 | ||
1024 | var->bits_per_pixel = 16; | |
1025 | var->red = red; | |
1026 | var->green = green; | |
1027 | var->blue = blue; | |
1028 | } | |
1029 | ||
2469d5db BT |
1030 | static int dlfb_ops_check_var(struct fb_var_screeninfo *var, |
1031 | struct fb_info *info) | |
1032 | { | |
1033 | struct fb_videomode mode; | |
1034 | ||
1035 | /* TODO: support dynamically changing framebuffer size */ | |
1036 | if ((var->xres * var->yres * 2) > info->fix.smem_len) | |
1037 | return -EINVAL; | |
1038 | ||
1039 | /* set device-specific elements of var unrelated to mode */ | |
1040 | dlfb_var_color_format(var); | |
1041 | ||
1042 | fb_var_to_videomode(&mode, var); | |
1043 | ||
1044 | if (!dlfb_is_valid_mode(&mode, info)) | |
1045 | return -EINVAL; | |
1046 | ||
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | static int dlfb_ops_set_par(struct fb_info *info) | |
1051 | { | |
1052 | struct dlfb_data *dev = info->par; | |
18dffdf8 BT |
1053 | int result; |
1054 | u16 *pix_framebuffer; | |
1055 | int i; | |
2469d5db BT |
1056 | |
1057 | dl_notice("set_par mode %dx%d\n", info->var.xres, info->var.yres); | |
1058 | ||
18dffdf8 BT |
1059 | result = dlfb_set_video_mode(dev, &info->var); |
1060 | ||
1061 | if ((result == 0) && (dev->fb_count == 0)) { | |
1062 | ||
1063 | /* paint greenscreen */ | |
1064 | ||
1065 | pix_framebuffer = (u16 *) info->screen_base; | |
1066 | for (i = 0; i < info->fix.smem_len / 2; i++) | |
1067 | pix_framebuffer[i] = 0x37e6; | |
1068 | ||
1069 | dlfb_handle_damage(dev, 0, 0, info->var.xres, info->var.yres, | |
1070 | info->screen_base); | |
1071 | } | |
1072 | ||
1073 | return result; | |
2469d5db BT |
1074 | } |
1075 | ||
9825f70f BT |
1076 | /* |
1077 | * In order to come back from full DPMS off, we need to set the mode again | |
1078 | */ | |
4574203f | 1079 | static int dlfb_ops_blank(int blank_mode, struct fb_info *info) |
f05e0575 | 1080 | { |
530f43a8 | 1081 | struct dlfb_data *dev = info->par; |
7316bc55 | 1082 | |
9825f70f BT |
1083 | if (blank_mode != FB_BLANK_UNBLANK) { |
1084 | char *bufptr; | |
1085 | struct urb *urb; | |
530f43a8 | 1086 | |
9825f70f BT |
1087 | urb = dlfb_get_urb(dev); |
1088 | if (!urb) | |
1089 | return 0; | |
530f43a8 | 1090 | |
9825f70f BT |
1091 | bufptr = (char *) urb->transfer_buffer; |
1092 | bufptr = dlfb_vidreg_lock(bufptr); | |
530f43a8 | 1093 | bufptr = dlfb_enable_hvsync(bufptr, false); |
9825f70f BT |
1094 | bufptr = dlfb_vidreg_unlock(bufptr); |
1095 | ||
1096 | dlfb_submit_urb(dev, urb, bufptr - | |
1097 | (char *) urb->transfer_buffer); | |
7316bc55 | 1098 | } else { |
9825f70f | 1099 | dlfb_set_video_mode(dev, &info->var); |
7316bc55 | 1100 | } |
7316bc55 | 1101 | |
88e58b1a RDI |
1102 | return 0; |
1103 | } | |
1104 | ||
1105 | static struct fb_ops dlfb_ops = { | |
2469d5db | 1106 | .owner = THIS_MODULE, |
d46ecb9f BT |
1107 | .fb_read = dlfb_ops_read, |
1108 | .fb_write = dlfb_ops_write, | |
4574203f BT |
1109 | .fb_setcolreg = dlfb_ops_setcolreg, |
1110 | .fb_fillrect = dlfb_ops_fillrect, | |
1111 | .fb_copyarea = dlfb_ops_copyarea, | |
1112 | .fb_imageblit = dlfb_ops_imageblit, | |
1113 | .fb_mmap = dlfb_ops_mmap, | |
1114 | .fb_ioctl = dlfb_ops_ioctl, | |
3e8f3d6f | 1115 | .fb_open = dlfb_ops_open, |
4574203f BT |
1116 | .fb_release = dlfb_ops_release, |
1117 | .fb_blank = dlfb_ops_blank, | |
2469d5db BT |
1118 | .fb_check_var = dlfb_ops_check_var, |
1119 | .fb_set_par = dlfb_ops_set_par, | |
88e58b1a RDI |
1120 | }; |
1121 | ||
18dffdf8 | 1122 | |
7d9485e2 | 1123 | /* |
18dffdf8 BT |
1124 | * Assumes &info->lock held by caller |
1125 | * Assumes no active clients have framebuffer open | |
1126 | */ | |
1127 | static int dlfb_realloc_framebuffer(struct dlfb_data *dev, struct fb_info *info) | |
1128 | { | |
1129 | int retval = -ENOMEM; | |
1130 | int old_len = info->fix.smem_len; | |
1131 | int new_len; | |
1132 | unsigned char *old_fb = info->screen_base; | |
1133 | unsigned char *new_fb; | |
1134 | unsigned char *new_back; | |
1135 | ||
1136 | dl_warn("Reallocating framebuffer. Addresses will change!\n"); | |
1137 | ||
1138 | new_len = info->fix.line_length * info->var.yres; | |
1139 | ||
1140 | if (PAGE_ALIGN(new_len) > old_len) { | |
1141 | /* | |
1142 | * Alloc system memory for virtual framebuffer | |
1143 | */ | |
1144 | new_fb = vmalloc(new_len); | |
1145 | if (!new_fb) { | |
1146 | dl_err("Virtual framebuffer alloc failed\n"); | |
1147 | goto error; | |
1148 | } | |
1149 | ||
1150 | if (info->screen_base) { | |
1151 | memcpy(new_fb, old_fb, old_len); | |
1152 | vfree(info->screen_base); | |
1153 | } | |
1154 | ||
1155 | info->screen_base = new_fb; | |
1156 | info->fix.smem_len = PAGE_ALIGN(new_len); | |
1157 | info->fix.smem_start = (unsigned long) new_fb; | |
1158 | info->flags = udlfb_info_flags; | |
1159 | ||
1160 | /* | |
1161 | * Second framebuffer copy to mirror the framebuffer state | |
1162 | * on the physical USB device. We can function without this. | |
1163 | * But with imperfect damage info we may send pixels over USB | |
1164 | * that were, in fact, unchanged - wasting limited USB bandwidth | |
1165 | */ | |
1166 | new_back = vmalloc(new_len); | |
1167 | if (!new_back) | |
1168 | dl_info("No shadow/backing buffer allcoated\n"); | |
1169 | else { | |
1170 | if (dev->backing_buffer) | |
1171 | vfree(dev->backing_buffer); | |
1172 | dev->backing_buffer = new_back; | |
1173 | memset(dev->backing_buffer, 0, new_len); | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | retval = 0; | |
1178 | ||
1179 | error: | |
1180 | return retval; | |
1181 | } | |
1182 | ||
1183 | /* | |
1184 | * 1) Get EDID from hw, or use sw default | |
1185 | * 2) Parse into various fb_info structs | |
1186 | * 3) Allocate virtual framebuffer memory to back highest res mode | |
1187 | * | |
1188 | * Parses EDID into three places used by various parts of fbdev: | |
7d9485e2 BT |
1189 | * fb_var_screeninfo contains the timing of the monitor's preferred mode |
1190 | * fb_info.monspecs is full parsed EDID info, including monspecs.modedb | |
1191 | * fb_info.modelist is a linked list of all monitor & VESA modes which work | |
1192 | * | |
1193 | * If EDID is not readable/valid, then modelist is all VESA modes, | |
1194 | * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode | |
18dffdf8 | 1195 | * Returns 0 if successful |
7d9485e2 | 1196 | */ |
18dffdf8 BT |
1197 | static int dlfb_setup_modes(struct dlfb_data *dev, |
1198 | struct fb_info *info, | |
1199 | char *default_edid, size_t default_edid_size) | |
7d9485e2 BT |
1200 | { |
1201 | int i; | |
1202 | const struct fb_videomode *default_vmode = NULL; | |
1203 | int result = 0; | |
18dffdf8 BT |
1204 | char *edid; |
1205 | int tries = 3; | |
1206 | ||
1207 | if (info->dev) /* only use mutex if info has been registered */ | |
1208 | mutex_lock(&info->lock); | |
1209 | ||
1210 | edid = kmalloc(MAX_EDID_SIZE, GFP_KERNEL); | |
1211 | if (!edid) { | |
1212 | result = -ENOMEM; | |
1213 | goto error; | |
1214 | } | |
7d9485e2 BT |
1215 | |
1216 | fb_destroy_modelist(&info->modelist); | |
1217 | memset(&info->monspecs, 0, sizeof(info->monspecs)); | |
1218 | ||
18dffdf8 BT |
1219 | /* |
1220 | * Try to (re)read EDID from hardware first | |
1221 | * EDID data may return, but not parse as valid | |
1222 | * Try again a few times, in case of e.g. analog cable noise | |
1223 | */ | |
1224 | while (tries--) { | |
1225 | ||
1226 | i = dlfb_get_edid(dev, edid, MAX_EDID_SIZE); | |
1227 | ||
1228 | if (i >= MIN_EDID_SIZE) | |
1229 | fb_edid_to_monspecs(edid, &info->monspecs); | |
1230 | ||
1231 | if (info->monspecs.modedb_len > 0) { | |
1232 | dev->edid = edid; | |
1233 | dev->edid_size = i; | |
1234 | break; | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | /* If that fails, use a previously returned EDID if available */ | |
1239 | if (info->monspecs.modedb_len == 0) { | |
1240 | ||
1241 | dl_err("Unable to get valid EDID from device/display\n"); | |
1242 | ||
1243 | if (dev->edid) { | |
1244 | fb_edid_to_monspecs(dev->edid, &info->monspecs); | |
1245 | if (info->monspecs.modedb_len > 0) | |
1246 | dl_err("Using previously queried EDID\n"); | |
1247 | } | |
1248 | } | |
1249 | ||
1250 | /* If that fails, use the default EDID we were handed */ | |
1251 | if (info->monspecs.modedb_len == 0) { | |
1252 | if (default_edid_size >= MIN_EDID_SIZE) { | |
1253 | fb_edid_to_monspecs(default_edid, &info->monspecs); | |
1254 | if (info->monspecs.modedb_len > 0) { | |
1255 | memcpy(edid, default_edid, default_edid_size); | |
1256 | dev->edid = edid; | |
1257 | dev->edid_size = default_edid_size; | |
1258 | dl_err("Using default/backup EDID\n"); | |
1259 | } | |
1260 | } | |
1261 | } | |
7d9485e2 | 1262 | |
18dffdf8 | 1263 | /* If we've got modes, let's pick a best default mode */ |
7d9485e2 BT |
1264 | if (info->monspecs.modedb_len > 0) { |
1265 | ||
1266 | for (i = 0; i < info->monspecs.modedb_len; i++) { | |
1267 | if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info)) | |
1268 | fb_add_videomode(&info->monspecs.modedb[i], | |
1269 | &info->modelist); | |
18dffdf8 BT |
1270 | else /* if we've removed top/best mode */ |
1271 | info->monspecs.misc &= ~FB_MISC_1ST_DETAIL; | |
7d9485e2 BT |
1272 | } |
1273 | ||
1274 | default_vmode = fb_find_best_display(&info->monspecs, | |
1275 | &info->modelist); | |
18dffdf8 | 1276 | } |
7d9485e2 | 1277 | |
18dffdf8 BT |
1278 | /* If everything else has failed, fall back to safe default mode */ |
1279 | if (default_vmode == NULL) { | |
1280 | ||
1281 | struct fb_videomode fb_vmode = {0}; | |
7d9485e2 BT |
1282 | |
1283 | /* | |
1284 | * Add the standard VESA modes to our modelist | |
1285 | * Since we don't have EDID, there may be modes that | |
1286 | * overspec monitor and/or are incorrect aspect ratio, etc. | |
1287 | * But at least the user has a chance to choose | |
1288 | */ | |
1289 | for (i = 0; i < VESA_MODEDB_SIZE; i++) { | |
1290 | if (dlfb_is_valid_mode((struct fb_videomode *) | |
1291 | &vesa_modes[i], info)) | |
1292 | fb_add_videomode(&vesa_modes[i], | |
1293 | &info->modelist); | |
1294 | } | |
1295 | ||
1296 | /* | |
1297 | * default to resolution safe for projectors | |
1298 | * (since they are most common case without EDID) | |
1299 | */ | |
1300 | fb_vmode.xres = 800; | |
1301 | fb_vmode.yres = 600; | |
1302 | fb_vmode.refresh = 60; | |
1303 | default_vmode = fb_find_nearest_mode(&fb_vmode, | |
1304 | &info->modelist); | |
1305 | } | |
1306 | ||
18dffdf8 BT |
1307 | /* If we have good mode and no active clients*/ |
1308 | if ((default_vmode != NULL) && (dev->fb_count == 0)) { | |
1309 | ||
1310 | fb_videomode_to_var(&info->var, default_vmode); | |
1311 | dlfb_var_color_format(&info->var); | |
1312 | ||
1313 | /* | |
1314 | * with mode size info, we can now alloc our framebuffer. | |
1315 | */ | |
1316 | memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix)); | |
1317 | info->fix.line_length = info->var.xres * | |
1318 | (info->var.bits_per_pixel / 8); | |
1319 | ||
1320 | result = dlfb_realloc_framebuffer(dev, info); | |
1321 | ||
1322 | } else | |
1323 | result = -EINVAL; | |
1324 | ||
1325 | error: | |
1326 | if (edid && (dev->edid != edid)) | |
1327 | kfree(edid); | |
1328 | ||
1329 | if (info->dev) | |
1330 | mutex_unlock(&info->lock); | |
7d9485e2 BT |
1331 | |
1332 | return result; | |
1333 | } | |
1334 | ||
1335 | static ssize_t metrics_bytes_rendered_show(struct device *fbdev, | |
1336 | struct device_attribute *a, char *buf) { | |
1337 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1338 | struct dlfb_data *dev = fb_info->par; | |
1339 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1340 | atomic_read(&dev->bytes_rendered)); | |
1341 | } | |
1342 | ||
1343 | static ssize_t metrics_bytes_identical_show(struct device *fbdev, | |
1344 | struct device_attribute *a, char *buf) { | |
1345 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1346 | struct dlfb_data *dev = fb_info->par; | |
1347 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1348 | atomic_read(&dev->bytes_identical)); | |
1349 | } | |
1350 | ||
1351 | static ssize_t metrics_bytes_sent_show(struct device *fbdev, | |
1352 | struct device_attribute *a, char *buf) { | |
1353 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1354 | struct dlfb_data *dev = fb_info->par; | |
1355 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1356 | atomic_read(&dev->bytes_sent)); | |
1357 | } | |
1358 | ||
1359 | static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev, | |
1360 | struct device_attribute *a, char *buf) { | |
1361 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1362 | struct dlfb_data *dev = fb_info->par; | |
1363 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1364 | atomic_read(&dev->cpu_kcycles_used)); | |
1365 | } | |
1366 | ||
18dffdf8 BT |
1367 | static ssize_t edid_show( |
1368 | struct file *filp, | |
1369 | struct kobject *kobj, struct bin_attribute *a, | |
7d9485e2 BT |
1370 | char *buf, loff_t off, size_t count) { |
1371 | struct device *fbdev = container_of(kobj, struct device, kobj); | |
1372 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1373 | struct dlfb_data *dev = fb_info->par; | |
7d9485e2 | 1374 | |
18dffdf8 | 1375 | if (dev->edid == NULL) |
7d9485e2 BT |
1376 | return 0; |
1377 | ||
18dffdf8 | 1378 | if ((off >= dev->edid_size) || (count > dev->edid_size)) |
7d9485e2 BT |
1379 | return 0; |
1380 | ||
18dffdf8 BT |
1381 | if (off + count > dev->edid_size) |
1382 | count = dev->edid_size - off; | |
1383 | ||
1384 | dl_info("sysfs edid copy %p to %p, %d bytes\n", | |
1385 | dev->edid, buf, (int) count); | |
1386 | ||
1387 | memcpy(buf, dev->edid, count); | |
7d9485e2 BT |
1388 | |
1389 | return count; | |
1390 | } | |
1391 | ||
8ef8cc4f BT |
1392 | static ssize_t edid_store( |
1393 | struct file *filp, | |
1394 | struct kobject *kobj, struct bin_attribute *a, | |
1395 | char *src, loff_t src_off, size_t src_size) { | |
1396 | struct device *fbdev = container_of(kobj, struct device, kobj); | |
1397 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1398 | struct dlfb_data *dev = fb_info->par; | |
1399 | ||
1400 | /* We only support write of entire EDID at once, no offset*/ | |
1401 | if ((src_size < MIN_EDID_SIZE) || | |
1402 | (src_size > MAX_EDID_SIZE) || | |
1403 | (src_off != 0)) | |
1404 | return 0; | |
1405 | ||
1406 | dlfb_setup_modes(dev, fb_info, src, src_size); | |
1407 | ||
1408 | if (dev->edid && (memcmp(src, dev->edid, src_size) == 0)) { | |
1409 | dl_info("sysfs written EDID is new default\n"); | |
1410 | dlfb_ops_set_par(fb_info); | |
1411 | return src_size; | |
1412 | } else | |
1413 | return 0; | |
1414 | } | |
7d9485e2 BT |
1415 | |
1416 | static ssize_t metrics_reset_store(struct device *fbdev, | |
1417 | struct device_attribute *attr, | |
1418 | const char *buf, size_t count) | |
1419 | { | |
1420 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1421 | struct dlfb_data *dev = fb_info->par; | |
1422 | ||
1423 | atomic_set(&dev->bytes_rendered, 0); | |
1424 | atomic_set(&dev->bytes_identical, 0); | |
1425 | atomic_set(&dev->bytes_sent, 0); | |
1426 | atomic_set(&dev->cpu_kcycles_used, 0); | |
7d9485e2 BT |
1427 | |
1428 | return count; | |
1429 | } | |
1430 | ||
7d9485e2 BT |
1431 | static struct bin_attribute edid_attr = { |
1432 | .attr.name = "edid", | |
8ef8cc4f BT |
1433 | .attr.mode = 0666, |
1434 | .size = MAX_EDID_SIZE, | |
7d9485e2 | 1435 | .read = edid_show, |
8ef8cc4f | 1436 | .write = edid_store |
7d9485e2 BT |
1437 | }; |
1438 | ||
1439 | static struct device_attribute fb_device_attrs[] = { | |
1440 | __ATTR_RO(metrics_bytes_rendered), | |
1441 | __ATTR_RO(metrics_bytes_identical), | |
1442 | __ATTR_RO(metrics_bytes_sent), | |
1443 | __ATTR_RO(metrics_cpu_kcycles_used), | |
7d9485e2 | 1444 | __ATTR(metrics_reset, S_IWUGO, NULL, metrics_reset_store), |
7d9485e2 BT |
1445 | }; |
1446 | ||
cc403dc6 BT |
1447 | /* |
1448 | * This is necessary before we can communicate with the display controller. | |
1449 | */ | |
1450 | static int dlfb_select_std_channel(struct dlfb_data *dev) | |
1451 | { | |
1452 | int ret; | |
1453 | u8 set_def_chn[] = { 0x57, 0xCD, 0xDC, 0xA7, | |
1454 | 0x1C, 0x88, 0x5E, 0x15, | |
1455 | 0x60, 0xFE, 0xC6, 0x97, | |
1456 | 0x16, 0x3D, 0x47, 0xF2 }; | |
1457 | ||
1458 | ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
1459 | NR_USB_REQUEST_CHANNEL, | |
1460 | (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, | |
1461 | set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT); | |
1462 | return ret; | |
1463 | } | |
1464 | ||
18dffdf8 BT |
1465 | static int dlfb_parse_vendor_descriptor(struct dlfb_data *dev, |
1466 | struct usb_device *usbdev) | |
1467 | { | |
1468 | char *desc; | |
1469 | char *buf; | |
1470 | char *desc_end; | |
1471 | ||
1472 | u8 total_len = 0; | |
1473 | ||
1474 | buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); | |
1475 | if (!buf) | |
1476 | return false; | |
1477 | desc = buf; | |
1478 | ||
1479 | total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */ | |
1480 | 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); | |
1481 | if (total_len > 5) { | |
1482 | dl_info("vendor descriptor length:%x data:%02x %02x %02x %02x" \ | |
1483 | "%02x %02x %02x %02x %02x %02x %02x\n", | |
1484 | total_len, desc[0], | |
1485 | desc[1], desc[2], desc[3], desc[4], desc[5], desc[6], | |
1486 | desc[7], desc[8], desc[9], desc[10]); | |
1487 | ||
1488 | if ((desc[0] != total_len) || /* descriptor length */ | |
1489 | (desc[1] != 0x5f) || /* vendor descriptor type */ | |
1490 | (desc[2] != 0x01) || /* version (2 bytes) */ | |
1491 | (desc[3] != 0x00) || | |
1492 | (desc[4] != total_len - 2)) /* length after type */ | |
1493 | goto unrecognized; | |
1494 | ||
1495 | desc_end = desc + total_len; | |
1496 | desc += 5; /* the fixed header we've already parsed */ | |
1497 | ||
1498 | while (desc < desc_end) { | |
1499 | u8 length; | |
1500 | u16 key; | |
1501 | ||
1502 | key = *((u16 *) desc); | |
1503 | desc += sizeof(u16); | |
1504 | length = *desc; | |
1505 | desc++; | |
1506 | ||
1507 | switch (key) { | |
1508 | case 0x0200: { /* max_area */ | |
1509 | u32 max_area; | |
1510 | max_area = le32_to_cpu(*((u32 *)desc)); | |
1511 | dl_warn("DL chip limited to %d pixel modes\n", | |
1512 | max_area); | |
1513 | dev->sku_pixel_limit = max_area; | |
1514 | break; | |
1515 | } | |
1516 | default: | |
1517 | break; | |
1518 | } | |
1519 | desc += length; | |
1520 | } | |
1521 | } | |
1522 | ||
1523 | goto success; | |
2469d5db | 1524 | |
18dffdf8 BT |
1525 | unrecognized: |
1526 | /* allow udlfb to load for now even if firmware unrecognized */ | |
1527 | dl_err("Unrecognized vendor firmware descriptor\n"); | |
1528 | ||
1529 | success: | |
1530 | kfree(buf); | |
1531 | return true; | |
1532 | } | |
2469d5db | 1533 | static int dlfb_usb_probe(struct usb_interface *interface, |
59277b67 | 1534 | const struct usb_device_id *id) |
88e58b1a | 1535 | { |
59277b67 | 1536 | struct usb_device *usbdev; |
18dffdf8 | 1537 | struct dlfb_data *dev = 0; |
33077b8d | 1538 | struct fb_info *info = 0; |
59277b67 | 1539 | int retval = -ENOMEM; |
2685cffa | 1540 | int i; |
59277b67 | 1541 | |
2469d5db BT |
1542 | /* usb initialization */ |
1543 | ||
1544 | usbdev = interface_to_usbdev(interface); | |
59277b67 BT |
1545 | |
1546 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1547 | if (dev == NULL) { | |
2469d5db BT |
1548 | err("dlfb_usb_probe: failed alloc of dev struct\n"); |
1549 | goto error; | |
88e58b1a | 1550 | } |
88e58b1a | 1551 | |
2469d5db BT |
1552 | /* we need to wait for both usb and fbdev to spin down on disconnect */ |
1553 | kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */ | |
18dffdf8 | 1554 | kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */ |
2469d5db | 1555 | |
59277b67 | 1556 | dev->udev = usbdev; |
4a4854dd | 1557 | dev->gdev = &usbdev->dev; /* our generic struct device * */ |
59277b67 BT |
1558 | usb_set_intfdata(interface, dev); |
1559 | ||
18dffdf8 BT |
1560 | dl_info("%s %s - serial #%s\n", |
1561 | usbdev->manufacturer, usbdev->product, usbdev->serial); | |
1562 | dl_info("vid_%04x&pid_%04x&rev_%04x driver's dlfb_data struct at %p\n", | |
1563 | usbdev->descriptor.idVendor, usbdev->descriptor.idProduct, | |
1564 | usbdev->descriptor.bcdDevice, dev); | |
d5ed5432 BT |
1565 | dl_info("console enable=%d\n", console); |
1566 | dl_info("fb_defio enable=%d\n", fb_defio); | |
18dffdf8 BT |
1567 | |
1568 | dev->sku_pixel_limit = 2048 * 1152; /* default to maximum */ | |
1569 | ||
1570 | if (!dlfb_parse_vendor_descriptor(dev, usbdev)) { | |
1571 | dl_err("firmware not recognized. Assume incompatible device\n"); | |
1572 | goto error; | |
1573 | } | |
1574 | ||
2469d5db BT |
1575 | if (!dlfb_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) { |
1576 | retval = -ENOMEM; | |
1577 | dl_err("dlfb_alloc_urb_list failed\n"); | |
1578 | goto error; | |
1579 | } | |
1580 | ||
2469d5db | 1581 | /* We don't register a new USB class. Our client interface is fbdev */ |
59277b67 | 1582 | |
2469d5db BT |
1583 | /* allocates framebuffer driver structure, not framebuffer memory */ |
1584 | info = framebuffer_alloc(0, &usbdev->dev); | |
1585 | if (!info) { | |
1586 | retval = -ENOMEM; | |
1587 | dl_err("framebuffer_alloc failed\n"); | |
1588 | goto error; | |
1589 | } | |
33077b8d | 1590 | |
59277b67 BT |
1591 | dev->info = info; |
1592 | info->par = dev; | |
1593 | info->pseudo_palette = dev->pseudo_palette; | |
2469d5db | 1594 | info->fbops = &dlfb_ops; |
59277b67 | 1595 | |
2469d5db BT |
1596 | retval = fb_alloc_cmap(&info->cmap, 256, 0); |
1597 | if (retval < 0) { | |
1598 | dl_err("fb_alloc_cmap failed %x\n", retval); | |
1599 | goto error; | |
1600 | } | |
88e58b1a | 1601 | |
33077b8d BT |
1602 | INIT_DELAYED_WORK(&dev->free_framebuffer_work, |
1603 | dlfb_free_framebuffer_work); | |
1604 | ||
18dffdf8 BT |
1605 | INIT_LIST_HEAD(&info->modelist); |
1606 | ||
1607 | retval = dlfb_setup_modes(dev, info, NULL, 0); | |
1608 | if (retval != 0) { | |
1609 | dl_err("unable to find common mode for display and adapter\n"); | |
1610 | goto error; | |
1611 | } | |
1612 | ||
2469d5db | 1613 | /* ready to begin using device */ |
88e58b1a | 1614 | |
2469d5db BT |
1615 | atomic_set(&dev->usb_active, 1); |
1616 | dlfb_select_std_channel(dev); | |
88e58b1a | 1617 | |
18dffdf8 | 1618 | dlfb_ops_check_var(&info->var, info); |
2469d5db | 1619 | dlfb_ops_set_par(info); |
88e58b1a | 1620 | |
2469d5db | 1621 | retval = register_framebuffer(info); |
59277b67 | 1622 | if (retval < 0) { |
2469d5db BT |
1623 | dl_err("register_framebuffer failed %d\n", retval); |
1624 | goto error; | |
7316bc55 | 1625 | } |
88e58b1a | 1626 | |
2469d5db BT |
1627 | for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) |
1628 | device_create_file(info->dev, &fb_device_attrs[i]); | |
88e58b1a | 1629 | |
2469d5db | 1630 | device_create_bin_file(info->dev, &edid_attr); |
88e58b1a | 1631 | |
18dffdf8 | 1632 | dl_info("DisplayLink USB device /dev/fb%d attached. %dx%d resolution." |
2469d5db | 1633 | " Using %dK framebuffer memory\n", info->node, |
18dffdf8 | 1634 | info->var.xres, info->var.yres, |
2469d5db | 1635 | ((dev->backing_buffer) ? |
18dffdf8 | 1636 | info->fix.smem_len * 2 : info->fix.smem_len) >> 10); |
88e58b1a RDI |
1637 | return 0; |
1638 | ||
2469d5db BT |
1639 | error: |
1640 | if (dev) { | |
2469d5db | 1641 | |
33077b8d BT |
1642 | if (info) { |
1643 | if (info->cmap.len != 0) | |
1644 | fb_dealloc_cmap(&info->cmap); | |
1645 | if (info->monspecs.modedb) | |
1646 | fb_destroy_modedb(info->monspecs.modedb); | |
1647 | if (info->screen_base) | |
1648 | vfree(info->screen_base); | |
1649 | ||
1650 | fb_destroy_modelist(&info->modelist); | |
1651 | ||
1652 | framebuffer_release(info); | |
1653 | } | |
1654 | ||
1655 | if (dev->backing_buffer) | |
1656 | vfree(dev->backing_buffer); | |
1657 | ||
1658 | kref_put(&dev->kref, dlfb_free); /* ref for framebuffer */ | |
1659 | kref_put(&dev->kref, dlfb_free); /* last ref from kref_init */ | |
2469d5db BT |
1660 | |
1661 | /* dev has been deallocated. Do not dereference */ | |
1662 | } | |
1663 | ||
59277b67 | 1664 | return retval; |
88e58b1a RDI |
1665 | } |
1666 | ||
2469d5db | 1667 | static void dlfb_usb_disconnect(struct usb_interface *interface) |
88e58b1a | 1668 | { |
59277b67 BT |
1669 | struct dlfb_data *dev; |
1670 | struct fb_info *info; | |
2469d5db | 1671 | int i; |
88e58b1a | 1672 | |
59277b67 | 1673 | dev = usb_get_intfdata(interface); |
2469d5db BT |
1674 | info = dev->info; |
1675 | ||
33077b8d | 1676 | dl_info("USB disconnect starting\n"); |
2469d5db | 1677 | |
33077b8d BT |
1678 | /* we virtualize until all fb clients release. Then we free */ |
1679 | dev->virtualized = true; | |
1680 | ||
1681 | /* When non-active we'll update virtual framebuffer, but no new urbs */ | |
1682 | atomic_set(&dev->usb_active, 0); | |
59277b67 | 1683 | |
33077b8d | 1684 | /* remove udlfb's sysfs interfaces */ |
2469d5db BT |
1685 | for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) |
1686 | device_remove_file(info->dev, &fb_device_attrs[i]); | |
2469d5db BT |
1687 | device_remove_bin_file(info->dev, &edid_attr); |
1688 | ||
33077b8d | 1689 | usb_set_intfdata(interface, NULL); |
59277b67 | 1690 | |
33077b8d BT |
1691 | /* if clients still have us open, will be freed on last close */ |
1692 | if (dev->fb_count == 0) | |
1693 | schedule_delayed_work(&dev->free_framebuffer_work, 0); | |
88e58b1a | 1694 | |
2469d5db | 1695 | /* release reference taken by kref_init in probe() */ |
33077b8d | 1696 | kref_put(&dev->kref, dlfb_free); |
88e58b1a | 1697 | |
2469d5db BT |
1698 | /* consider dlfb_data freed */ |
1699 | ||
1700 | return; | |
88e58b1a RDI |
1701 | } |
1702 | ||
1703 | static struct usb_driver dlfb_driver = { | |
1704 | .name = "udlfb", | |
2469d5db BT |
1705 | .probe = dlfb_usb_probe, |
1706 | .disconnect = dlfb_usb_disconnect, | |
88e58b1a RDI |
1707 | .id_table = id_table, |
1708 | }; | |
1709 | ||
2469d5db | 1710 | static int __init dlfb_module_init(void) |
88e58b1a RDI |
1711 | { |
1712 | int res; | |
1713 | ||
88e58b1a RDI |
1714 | res = usb_register(&dlfb_driver); |
1715 | if (res) | |
1716 | err("usb_register failed. Error number %d", res); | |
1717 | ||
88e58b1a RDI |
1718 | return res; |
1719 | } | |
1720 | ||
2469d5db | 1721 | static void __exit dlfb_module_exit(void) |
88e58b1a RDI |
1722 | { |
1723 | usb_deregister(&dlfb_driver); | |
1724 | } | |
1725 | ||
2469d5db BT |
1726 | module_init(dlfb_module_init); |
1727 | module_exit(dlfb_module_exit); | |
88e58b1a | 1728 | |
4a4854dd BT |
1729 | static void dlfb_urb_completion(struct urb *urb) |
1730 | { | |
1731 | struct urb_node *unode = urb->context; | |
1732 | struct dlfb_data *dev = unode->dev; | |
1733 | unsigned long flags; | |
1734 | ||
1735 | /* sync/async unlink faults aren't errors */ | |
1736 | if (urb->status) { | |
1737 | if (!(urb->status == -ENOENT || | |
1738 | urb->status == -ECONNRESET || | |
1739 | urb->status == -ESHUTDOWN)) { | |
1740 | dl_err("%s - nonzero write bulk status received: %d\n", | |
1741 | __func__, urb->status); | |
1742 | atomic_set(&dev->lost_pixels, 1); | |
1743 | } | |
1744 | } | |
1745 | ||
1746 | urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */ | |
1747 | ||
1748 | spin_lock_irqsave(&dev->urbs.lock, flags); | |
1749 | list_add_tail(&unode->entry, &dev->urbs.list); | |
1750 | dev->urbs.available++; | |
1751 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1752 | ||
5bea1fbf BT |
1753 | /* |
1754 | * When using fb_defio, we deadlock if up() is called | |
1755 | * while another is waiting. So queue to another process. | |
1756 | */ | |
1757 | if (fb_defio) | |
1758 | schedule_delayed_work(&unode->release_urb_work, 0); | |
1759 | else | |
1760 | up(&dev->urbs.limit_sem); | |
4a4854dd BT |
1761 | } |
1762 | ||
1763 | static void dlfb_free_urb_list(struct dlfb_data *dev) | |
1764 | { | |
1765 | int count = dev->urbs.count; | |
1766 | struct list_head *node; | |
1767 | struct urb_node *unode; | |
1768 | struct urb *urb; | |
1769 | int ret; | |
1770 | unsigned long flags; | |
1771 | ||
1772 | dl_notice("Waiting for completes and freeing all render urbs\n"); | |
1773 | ||
1774 | /* keep waiting and freeing, until we've got 'em all */ | |
1775 | while (count--) { | |
33077b8d BT |
1776 | |
1777 | /* Getting interrupted means a leak, but ok at shutdown*/ | |
1778 | ret = down_interruptible(&dev->urbs.limit_sem); | |
1779 | if (ret) | |
4a4854dd | 1780 | break; |
33077b8d | 1781 | |
4a4854dd BT |
1782 | spin_lock_irqsave(&dev->urbs.lock, flags); |
1783 | ||
1784 | node = dev->urbs.list.next; /* have reserved one with sem */ | |
1785 | list_del_init(node); | |
1786 | ||
1787 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1788 | ||
1789 | unode = list_entry(node, struct urb_node, entry); | |
1790 | urb = unode->urb; | |
1791 | ||
1792 | /* Free each separately allocated piece */ | |
c220cc3e GKH |
1793 | usb_free_coherent(urb->dev, dev->urbs.size, |
1794 | urb->transfer_buffer, urb->transfer_dma); | |
4a4854dd BT |
1795 | usb_free_urb(urb); |
1796 | kfree(node); | |
1797 | } | |
1798 | ||
4a4854dd BT |
1799 | } |
1800 | ||
1801 | static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size) | |
1802 | { | |
1803 | int i = 0; | |
1804 | struct urb *urb; | |
1805 | struct urb_node *unode; | |
1806 | char *buf; | |
1807 | ||
1808 | spin_lock_init(&dev->urbs.lock); | |
1809 | ||
1810 | dev->urbs.size = size; | |
1811 | INIT_LIST_HEAD(&dev->urbs.list); | |
1812 | ||
1813 | while (i < count) { | |
1814 | unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL); | |
1815 | if (!unode) | |
1816 | break; | |
1817 | unode->dev = dev; | |
1818 | ||
5bea1fbf BT |
1819 | INIT_DELAYED_WORK(&unode->release_urb_work, |
1820 | dlfb_release_urb_work); | |
1821 | ||
4a4854dd BT |
1822 | urb = usb_alloc_urb(0, GFP_KERNEL); |
1823 | if (!urb) { | |
1824 | kfree(unode); | |
1825 | break; | |
1826 | } | |
1827 | unode->urb = urb; | |
1828 | ||
c220cc3e GKH |
1829 | buf = usb_alloc_coherent(dev->udev, MAX_TRANSFER, GFP_KERNEL, |
1830 | &urb->transfer_dma); | |
4a4854dd BT |
1831 | if (!buf) { |
1832 | kfree(unode); | |
1833 | usb_free_urb(urb); | |
1834 | break; | |
1835 | } | |
1836 | ||
1837 | /* urb->transfer_buffer_length set to actual before submit */ | |
1838 | usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1), | |
1839 | buf, size, dlfb_urb_completion, unode); | |
1840 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
1841 | ||
1842 | list_add_tail(&unode->entry, &dev->urbs.list); | |
1843 | ||
1844 | i++; | |
1845 | } | |
1846 | ||
1847 | sema_init(&dev->urbs.limit_sem, i); | |
1848 | dev->urbs.count = i; | |
1849 | dev->urbs.available = i; | |
1850 | ||
b5a2104c | 1851 | dl_notice("allocated %d %d byte urbs\n", i, (int) size); |
4a4854dd BT |
1852 | |
1853 | return i; | |
1854 | } | |
1855 | ||
1856 | static struct urb *dlfb_get_urb(struct dlfb_data *dev) | |
1857 | { | |
1858 | int ret = 0; | |
1859 | struct list_head *entry; | |
1860 | struct urb_node *unode; | |
1861 | struct urb *urb = NULL; | |
1862 | unsigned long flags; | |
1863 | ||
1864 | /* Wait for an in-flight buffer to complete and get re-queued */ | |
1865 | ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT); | |
1866 | if (ret) { | |
1867 | atomic_set(&dev->lost_pixels, 1); | |
5bea1fbf BT |
1868 | dl_warn("wait for urb interrupted: %x available: %d\n", |
1869 | ret, dev->urbs.available); | |
4a4854dd BT |
1870 | goto error; |
1871 | } | |
1872 | ||
1873 | spin_lock_irqsave(&dev->urbs.lock, flags); | |
1874 | ||
1875 | BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */ | |
1876 | entry = dev->urbs.list.next; | |
1877 | list_del_init(entry); | |
1878 | dev->urbs.available--; | |
1879 | ||
1880 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1881 | ||
1882 | unode = list_entry(entry, struct urb_node, entry); | |
1883 | urb = unode->urb; | |
1884 | ||
1885 | error: | |
1886 | return urb; | |
1887 | } | |
1888 | ||
1889 | static int dlfb_submit_urb(struct dlfb_data *dev, struct urb *urb, size_t len) | |
1890 | { | |
1891 | int ret; | |
1892 | ||
1893 | BUG_ON(len > dev->urbs.size); | |
1894 | ||
1895 | urb->transfer_buffer_length = len; /* set to actual payload len */ | |
1896 | ret = usb_submit_urb(urb, GFP_KERNEL); | |
1897 | if (ret) { | |
1898 | dlfb_urb_completion(urb); /* because no one else will */ | |
1899 | atomic_set(&dev->lost_pixels, 1); | |
1900 | dl_err("usb_submit_urb error %x\n", ret); | |
1901 | } | |
1902 | return ret; | |
1903 | } | |
1904 | ||
d5ed5432 BT |
1905 | module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); |
1906 | MODULE_PARM_DESC(console, "Allow fbcon to consume first framebuffer found"); | |
1907 | ||
1908 | module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); | |
1909 | MODULE_PARM_DESC(fb_defio, "Enable fb_defio mmap support. *Experimental*"); | |
1910 | ||
59277b67 | 1911 | MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, " |
2469d5db BT |
1912 | "Jaya Kumar <jayakumar.lkml@gmail.com>, " |
1913 | "Bernie Thompson <bernie@plugable.com>"); | |
1914 | MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); | |
88e58b1a | 1915 | MODULE_LICENSE("GPL"); |
2469d5db | 1916 |