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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 | 28 | #include <linux/delay.h> |
96f8d864 | 29 | #include <video/udlfb.h> |
b9f03a3c | 30 | #include "edid.h" |
88e58b1a | 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 | 42 | static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST | |
2469d5db | 43 | FBINFO_VIRTFB | |
2469d5db BT |
44 | FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | |
45 | FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; | |
46 | ||
cc403dc6 BT |
47 | /* |
48 | * There are many DisplayLink-based products, all with unique PIDs. We are able | |
49 | * to support all volume ones (circa 2009) with a single driver, so we match | |
50 | * globally on VID. TODO: Probe() needs to detect when we might be running | |
51 | * "future" chips, and bail on those, so a compatible driver can match. | |
52 | */ | |
53 | static struct usb_device_id id_table[] = { | |
54 | {.idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,}, | |
55 | {}, | |
56 | }; | |
57 | MODULE_DEVICE_TABLE(usb, id_table); | |
88e58b1a | 58 | |
d5ed5432 BT |
59 | /* module options */ |
60 | static int console; /* Optionally allow fbcon to consume first framebuffer */ | |
61 | static int fb_defio; /* Optionally enable experimental fb_defio mmap support */ | |
dd8015f1 | 62 | |
4a4854dd BT |
63 | /* dlfb keeps a list of urbs for efficient bulk transfers */ |
64 | static void dlfb_urb_completion(struct urb *urb); | |
65 | static struct urb *dlfb_get_urb(struct dlfb_data *dev); | |
66 | static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len); | |
67 | static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size); | |
68 | static void dlfb_free_urb_list(struct dlfb_data *dev); | |
69 | ||
59277b67 | 70 | /* |
bd80816b BT |
71 | * All DisplayLink bulk operations start with 0xAF, followed by specific code |
72 | * All operations are written to buffers which then later get sent to device | |
59277b67 | 73 | */ |
4574203f | 74 | static char *dlfb_set_register(char *buf, u8 reg, u8 val) |
88e58b1a | 75 | { |
1d31a9ee BT |
76 | *buf++ = 0xAF; |
77 | *buf++ = 0x20; | |
78 | *buf++ = reg; | |
79 | *buf++ = val; | |
80 | return buf; | |
59277b67 | 81 | } |
88e58b1a | 82 | |
4574203f | 83 | static char *dlfb_vidreg_lock(char *buf) |
59277b67 | 84 | { |
4574203f | 85 | return dlfb_set_register(buf, 0xFF, 0x00); |
59277b67 | 86 | } |
88e58b1a | 87 | |
4574203f | 88 | static char *dlfb_vidreg_unlock(char *buf) |
59277b67 | 89 | { |
4574203f | 90 | return dlfb_set_register(buf, 0xFF, 0xFF); |
59277b67 BT |
91 | } |
92 | ||
93 | /* | |
530f43a8 | 94 | * On/Off for driving the DisplayLink framebuffer to the display |
9825f70f BT |
95 | * 0x00 H and V sync on |
96 | * 0x01 H and V sync off (screen blank but powered) | |
97 | * 0x07 DPMS powerdown (requires modeset to come back) | |
59277b67 | 98 | */ |
530f43a8 | 99 | static char *dlfb_enable_hvsync(char *buf, bool enable) |
59277b67 | 100 | { |
530f43a8 BT |
101 | if (enable) |
102 | return dlfb_set_register(buf, 0x1F, 0x00); | |
103 | else | |
9825f70f | 104 | return dlfb_set_register(buf, 0x1F, 0x07); |
59277b67 BT |
105 | } |
106 | ||
4574203f | 107 | static char *dlfb_set_color_depth(char *buf, u8 selection) |
59277b67 | 108 | { |
4574203f | 109 | return dlfb_set_register(buf, 0x00, selection); |
59277b67 BT |
110 | } |
111 | ||
4574203f | 112 | static char *dlfb_set_base16bpp(char *wrptr, u32 base) |
59277b67 | 113 | { |
1d31a9ee | 114 | /* the base pointer is 16 bits wide, 0x20 is hi byte. */ |
4574203f BT |
115 | wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); |
116 | wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); | |
117 | return dlfb_set_register(wrptr, 0x22, base); | |
59277b67 BT |
118 | } |
119 | ||
bd80816b BT |
120 | /* |
121 | * DisplayLink HW has separate 16bpp and 8bpp framebuffers. | |
122 | * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer | |
123 | */ | |
4574203f | 124 | static char *dlfb_set_base8bpp(char *wrptr, u32 base) |
59277b67 | 125 | { |
4574203f BT |
126 | wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); |
127 | wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); | |
128 | return dlfb_set_register(wrptr, 0x28, base); | |
59277b67 BT |
129 | } |
130 | ||
4574203f | 131 | static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) |
59277b67 | 132 | { |
4574203f BT |
133 | wrptr = dlfb_set_register(wrptr, reg, value >> 8); |
134 | return dlfb_set_register(wrptr, reg+1, value); | |
59277b67 BT |
135 | } |
136 | ||
137 | /* | |
138 | * This is kind of weird because the controller takes some | |
139 | * register values in a different byte order than other registers. | |
140 | */ | |
4574203f | 141 | static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) |
59277b67 | 142 | { |
4574203f BT |
143 | wrptr = dlfb_set_register(wrptr, reg, value); |
144 | return dlfb_set_register(wrptr, reg+1, value >> 8); | |
59277b67 BT |
145 | } |
146 | ||
147 | /* | |
148 | * LFSR is linear feedback shift register. The reason we have this is | |
149 | * because the display controller needs to minimize the clock depth of | |
150 | * various counters used in the display path. So this code reverses the | |
151 | * provided value into the lfsr16 value by counting backwards to get | |
152 | * the value that needs to be set in the hardware comparator to get the | |
153 | * same actual count. This makes sense once you read above a couple of | |
154 | * times and think about it from a hardware perspective. | |
155 | */ | |
bd80816b | 156 | static u16 dlfb_lfsr16(u16 actual_count) |
59277b67 BT |
157 | { |
158 | u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ | |
159 | ||
160 | while (actual_count--) { | |
161 | lv = ((lv << 1) | | |
162 | (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) | |
163 | & 0xFFFF; | |
88e58b1a RDI |
164 | } |
165 | ||
59277b67 BT |
166 | return (u16) lv; |
167 | } | |
168 | ||
169 | /* | |
170 | * This does LFSR conversion on the value that is to be written. | |
171 | * See LFSR explanation above for more detail. | |
172 | */ | |
4574203f | 173 | static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) |
59277b67 | 174 | { |
bd80816b | 175 | return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); |
88e58b1a RDI |
176 | } |
177 | ||
59277b67 BT |
178 | /* |
179 | * This takes a standard fbdev screeninfo struct and all of its monitor mode | |
180 | * details and converts them into the DisplayLink equivalent register commands. | |
181 | */ | |
4574203f | 182 | static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) |
88e58b1a | 183 | { |
59277b67 BT |
184 | u16 xds, yds; |
185 | u16 xde, yde; | |
186 | u16 yec; | |
187 | ||
59277b67 BT |
188 | /* x display start */ |
189 | xds = var->left_margin + var->hsync_len; | |
4574203f | 190 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); |
59277b67 BT |
191 | /* x display end */ |
192 | xde = xds + var->xres; | |
4574203f | 193 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); |
59277b67 BT |
194 | |
195 | /* y display start */ | |
196 | yds = var->upper_margin + var->vsync_len; | |
4574203f | 197 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); |
59277b67 BT |
198 | /* y display end */ |
199 | yde = yds + var->yres; | |
4574203f | 200 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); |
59277b67 BT |
201 | |
202 | /* x end count is active + blanking - 1 */ | |
4574203f BT |
203 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, |
204 | xde + var->right_margin - 1); | |
59277b67 BT |
205 | |
206 | /* libdlo hardcodes hsync start to 1 */ | |
4574203f | 207 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); |
59277b67 BT |
208 | |
209 | /* hsync end is width of sync pulse + 1 */ | |
4574203f | 210 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); |
59277b67 BT |
211 | |
212 | /* hpixels is active pixels */ | |
4574203f | 213 | wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); |
88e58b1a | 214 | |
59277b67 BT |
215 | /* yendcount is vertical active + vertical blanking */ |
216 | yec = var->yres + var->upper_margin + var->lower_margin + | |
217 | var->vsync_len; | |
4574203f | 218 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); |
88e58b1a | 219 | |
59277b67 | 220 | /* libdlo hardcodes vsync start to 0 */ |
4574203f | 221 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); |
59277b67 BT |
222 | |
223 | /* vsync end is width of vsync pulse */ | |
4574203f | 224 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); |
59277b67 BT |
225 | |
226 | /* vpixels is active pixels */ | |
4574203f | 227 | wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); |
59277b67 BT |
228 | |
229 | /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ | |
4574203f BT |
230 | wrptr = dlfb_set_register_16be(wrptr, 0x1B, |
231 | 200*1000*1000/var->pixclock); | |
59277b67 BT |
232 | |
233 | return wrptr; | |
234 | } | |
235 | ||
236 | /* | |
237 | * This takes a standard fbdev screeninfo struct that was fetched or prepared | |
238 | * and then generates the appropriate command sequence that then drives the | |
239 | * display controller. | |
240 | */ | |
241 | static int dlfb_set_video_mode(struct dlfb_data *dev, | |
242 | struct fb_var_screeninfo *var) | |
243 | { | |
244 | char *buf; | |
245 | char *wrptr; | |
246 | int retval = 0; | |
247 | int writesize; | |
530f43a8 BT |
248 | struct urb *urb; |
249 | ||
250 | if (!atomic_read(&dev->usb_active)) | |
251 | return -EPERM; | |
59277b67 | 252 | |
530f43a8 BT |
253 | urb = dlfb_get_urb(dev); |
254 | if (!urb) | |
255 | return -ENOMEM; | |
2685cffa | 256 | |
530f43a8 | 257 | buf = (char *) urb->transfer_buffer; |
59277b67 BT |
258 | |
259 | /* | |
260 | * This first section has to do with setting the base address on the | |
261 | * controller * associated with the display. There are 2 base | |
262 | * pointers, currently, we only * use the 16 bpp segment. | |
263 | */ | |
4574203f BT |
264 | wrptr = dlfb_vidreg_lock(buf); |
265 | wrptr = dlfb_set_color_depth(wrptr, 0x00); | |
59277b67 | 266 | /* set base for 16bpp segment to 0 */ |
4574203f | 267 | wrptr = dlfb_set_base16bpp(wrptr, 0); |
59277b67 | 268 | /* set base for 8bpp segment to end of fb */ |
4574203f | 269 | wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len); |
59277b67 | 270 | |
4574203f | 271 | wrptr = dlfb_set_vid_cmds(wrptr, var); |
530f43a8 | 272 | wrptr = dlfb_enable_hvsync(wrptr, true); |
4574203f | 273 | wrptr = dlfb_vidreg_unlock(wrptr); |
59277b67 BT |
274 | |
275 | writesize = wrptr - buf; | |
276 | ||
530f43a8 | 277 | retval = dlfb_submit_urb(dev, urb, writesize); |
59277b67 | 278 | |
59277b67 BT |
279 | return retval; |
280 | } | |
281 | ||
4574203f | 282 | static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) |
88e58b1a RDI |
283 | { |
284 | unsigned long start = vma->vm_start; | |
285 | unsigned long size = vma->vm_end - vma->vm_start; | |
286 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
287 | unsigned long page, pos; | |
288 | ||
f05e0575 | 289 | if (offset + size > info->fix.smem_len) |
88e58b1a | 290 | return -EINVAL; |
88e58b1a RDI |
291 | |
292 | pos = (unsigned long)info->fix.smem_start + offset; | |
293 | ||
2685cffa BT |
294 | dl_notice("mmap() framebuffer addr:%lu size:%lu\n", |
295 | pos, size); | |
296 | ||
88e58b1a RDI |
297 | while (size > 0) { |
298 | page = vmalloc_to_pfn((void *)pos); | |
f05e0575 | 299 | if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) |
88e58b1a | 300 | return -EAGAIN; |
f05e0575 | 301 | |
88e58b1a RDI |
302 | start += PAGE_SIZE; |
303 | pos += PAGE_SIZE; | |
304 | if (size > PAGE_SIZE) | |
305 | size -= PAGE_SIZE; | |
306 | else | |
307 | size = 0; | |
308 | } | |
309 | ||
310 | vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */ | |
311 | return 0; | |
88e58b1a RDI |
312 | } |
313 | ||
530f43a8 BT |
314 | /* |
315 | * Trims identical data from front and back of line | |
316 | * Sets new front buffer address and width | |
317 | * And returns byte count of identical pixels | |
318 | * Assumes CPU natural alignment (unsigned long) | |
319 | * for back and front buffer ptrs and width | |
320 | */ | |
321 | static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) | |
7316bc55 | 322 | { |
530f43a8 BT |
323 | int j, k; |
324 | const unsigned long *back = (const unsigned long *) bback; | |
325 | const unsigned long *front = (const unsigned long *) *bfront; | |
326 | const int width = *width_bytes / sizeof(unsigned long); | |
327 | int identical = width; | |
328 | int start = width; | |
329 | int end = width; | |
330 | ||
331 | prefetch((void *) front); | |
332 | prefetch((void *) back); | |
333 | ||
334 | for (j = 0; j < width; j++) { | |
335 | if (back[j] != front[j]) { | |
336 | start = j; | |
337 | break; | |
338 | } | |
339 | } | |
7316bc55 | 340 | |
530f43a8 BT |
341 | for (k = width - 1; k > j; k--) { |
342 | if (back[k] != front[k]) { | |
343 | end = k+1; | |
344 | break; | |
345 | } | |
7316bc55 RDI |
346 | } |
347 | ||
530f43a8 BT |
348 | identical = start + (width - end); |
349 | *bfront = (u8 *) &front[start]; | |
350 | *width_bytes = (end - start) * sizeof(unsigned long); | |
351 | ||
352 | return identical * sizeof(unsigned long); | |
7316bc55 RDI |
353 | } |
354 | ||
355 | /* | |
3b7b31fa PM |
356 | * Render a command stream for an encoded horizontal line segment of pixels. |
357 | * | |
358 | * A command buffer holds several commands. | |
359 | * It always begins with a fresh command header | |
360 | * (the protocol doesn't require this, but we enforce it to allow | |
361 | * multiple buffers to be potentially encoded and sent in parallel). | |
362 | * A single command encodes one contiguous horizontal line of pixels | |
363 | * | |
364 | * The function relies on the client to do all allocation, so that | |
365 | * rendering can be done directly to output buffers (e.g. USB URBs). | |
366 | * The function fills the supplied command buffer, providing information | |
367 | * on where it left off, so the client may call in again with additional | |
368 | * buffers if the line will take several buffers to complete. | |
369 | * | |
370 | * A single command can transmit a maximum of 256 pixels, | |
371 | * regardless of the compression ratio (protocol design limit). | |
372 | * To the hardware, 0 for a size byte means 256 | |
2685cffa | 373 | * |
3b7b31fa PM |
374 | * Rather than 256 pixel commands which are either rl or raw encoded, |
375 | * the rlx command simply assumes alternating raw and rl spans within one cmd. | |
376 | * This has a slightly larger header overhead, but produces more even results. | |
377 | * It also processes all data (read and write) in a single pass. | |
378 | * Performance benchmarks of common cases show it having just slightly better | |
2685cffa | 379 | * compression than 256 pixel raw or rle commands, with similar CPU consumpion. |
3b7b31fa PM |
380 | * But for very rl friendly data, will compress not quite as well. |
381 | */ | |
530f43a8 BT |
382 | static void dlfb_compress_hline( |
383 | const uint16_t **pixel_start_ptr, | |
384 | const uint16_t *const pixel_end, | |
385 | uint32_t *device_address_ptr, | |
386 | uint8_t **command_buffer_ptr, | |
387 | const uint8_t *const cmd_buffer_end) | |
88e58b1a | 388 | { |
530f43a8 BT |
389 | const uint16_t *pixel = *pixel_start_ptr; |
390 | uint32_t dev_addr = *device_address_ptr; | |
391 | uint8_t *cmd = *command_buffer_ptr; | |
392 | const int bpp = 2; | |
393 | ||
394 | while ((pixel_end > pixel) && | |
395 | (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { | |
396 | uint8_t *raw_pixels_count_byte = 0; | |
397 | uint8_t *cmd_pixels_count_byte = 0; | |
398 | const uint16_t *raw_pixel_start = 0; | |
399 | const uint16_t *cmd_pixel_start, *cmd_pixel_end = 0; | |
530f43a8 BT |
400 | |
401 | prefetchw((void *) cmd); /* pull in one cache line at least */ | |
402 | ||
403 | *cmd++ = 0xAF; | |
404 | *cmd++ = 0x6B; | |
1572f91c BT |
405 | *cmd++ = (uint8_t) ((dev_addr >> 16) & 0xFF); |
406 | *cmd++ = (uint8_t) ((dev_addr >> 8) & 0xFF); | |
407 | *cmd++ = (uint8_t) ((dev_addr) & 0xFF); | |
530f43a8 BT |
408 | |
409 | cmd_pixels_count_byte = cmd++; /* we'll know this later */ | |
410 | cmd_pixel_start = pixel; | |
411 | ||
412 | raw_pixels_count_byte = cmd++; /* we'll know this later */ | |
413 | raw_pixel_start = pixel; | |
414 | ||
415 | cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1, | |
416 | min((int)(pixel_end - pixel), | |
417 | (int)(cmd_buffer_end - cmd) / bpp)); | |
418 | ||
419 | prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp); | |
420 | ||
421 | while (pixel < cmd_pixel_end) { | |
422 | const uint16_t * const repeating_pixel = pixel; | |
423 | ||
424 | *(uint16_t *)cmd = cpu_to_be16p(pixel); | |
425 | cmd += 2; | |
426 | pixel++; | |
427 | ||
428 | if (unlikely((pixel < cmd_pixel_end) && | |
429 | (*pixel == *repeating_pixel))) { | |
430 | /* go back and fill in raw pixel count */ | |
431 | *raw_pixels_count_byte = ((repeating_pixel - | |
432 | raw_pixel_start) + 1) & 0xFF; | |
433 | ||
434 | while ((pixel < cmd_pixel_end) | |
435 | && (*pixel == *repeating_pixel)) { | |
436 | pixel++; | |
88e58b1a | 437 | } |
59277b67 | 438 | |
530f43a8 BT |
439 | /* immediately after raw data is repeat byte */ |
440 | *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF; | |
59277b67 | 441 | |
530f43a8 BT |
442 | /* Then start another raw pixel span */ |
443 | raw_pixel_start = pixel; | |
444 | raw_pixels_count_byte = cmd++; | |
7316bc55 | 445 | } |
88e58b1a RDI |
446 | } |
447 | ||
530f43a8 BT |
448 | if (pixel > raw_pixel_start) { |
449 | /* finalize last RAW span */ | |
450 | *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF; | |
451 | } | |
88e58b1a | 452 | |
530f43a8 BT |
453 | *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; |
454 | dev_addr += (pixel - cmd_pixel_start) * bpp; | |
88e58b1a RDI |
455 | } |
456 | ||
530f43a8 BT |
457 | if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) { |
458 | /* Fill leftover bytes with no-ops */ | |
459 | if (cmd_buffer_end > cmd) | |
460 | memset(cmd, 0xAF, cmd_buffer_end - cmd); | |
461 | cmd = (uint8_t *) cmd_buffer_end; | |
7316bc55 | 462 | } |
88e58b1a | 463 | |
530f43a8 BT |
464 | *command_buffer_ptr = cmd; |
465 | *pixel_start_ptr = pixel; | |
466 | *device_address_ptr = dev_addr; | |
88e58b1a | 467 | |
530f43a8 | 468 | return; |
88e58b1a RDI |
469 | } |
470 | ||
530f43a8 BT |
471 | /* |
472 | * There are 3 copies of every pixel: The front buffer that the fbdev | |
473 | * client renders to, the actual framebuffer across the USB bus in hardware | |
474 | * (that we can only write to, slowly, and can never read), and (optionally) | |
475 | * our shadow copy that tracks what's been sent to that hardware buffer. | |
476 | */ | |
5bea1fbf | 477 | static int dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr, |
530f43a8 BT |
478 | const char *front, char **urb_buf_ptr, |
479 | u32 byte_offset, u32 byte_width, | |
480 | int *ident_ptr, int *sent_ptr) | |
88e58b1a | 481 | { |
530f43a8 BT |
482 | const u8 *line_start, *line_end, *next_pixel; |
483 | u32 dev_addr = dev->base16 + byte_offset; | |
484 | struct urb *urb = *urb_ptr; | |
485 | u8 *cmd = *urb_buf_ptr; | |
486 | u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; | |
487 | ||
488 | line_start = (u8 *) (front + byte_offset); | |
489 | next_pixel = line_start; | |
490 | line_end = next_pixel + byte_width; | |
491 | ||
492 | if (dev->backing_buffer) { | |
493 | int offset; | |
494 | const u8 *back_start = (u8 *) (dev->backing_buffer | |
495 | + byte_offset); | |
496 | ||
497 | *ident_ptr += dlfb_trim_hline(back_start, &next_pixel, | |
498 | &byte_width); | |
499 | ||
500 | offset = next_pixel - line_start; | |
501 | line_end = next_pixel + byte_width; | |
502 | dev_addr += offset; | |
503 | back_start += offset; | |
504 | line_start += offset; | |
505 | ||
506 | memcpy((char *)back_start, (char *) line_start, | |
507 | byte_width); | |
508 | } | |
88e58b1a | 509 | |
530f43a8 BT |
510 | while (next_pixel < line_end) { |
511 | ||
512 | dlfb_compress_hline((const uint16_t **) &next_pixel, | |
513 | (const uint16_t *) line_end, &dev_addr, | |
514 | (u8 **) &cmd, (u8 *) cmd_end); | |
515 | ||
516 | if (cmd >= cmd_end) { | |
517 | int len = cmd - (u8 *) urb->transfer_buffer; | |
518 | if (dlfb_submit_urb(dev, urb, len)) | |
5bea1fbf | 519 | return 1; /* lost pixels is set */ |
530f43a8 BT |
520 | *sent_ptr += len; |
521 | urb = dlfb_get_urb(dev); | |
522 | if (!urb) | |
5bea1fbf | 523 | return 1; /* lost_pixels is set */ |
530f43a8 BT |
524 | *urb_ptr = urb; |
525 | cmd = urb->transfer_buffer; | |
526 | cmd_end = &cmd[urb->transfer_buffer_length]; | |
88e58b1a | 527 | } |
88e58b1a RDI |
528 | } |
529 | ||
530f43a8 | 530 | *urb_buf_ptr = cmd; |
5bea1fbf BT |
531 | |
532 | return 0; | |
88e58b1a RDI |
533 | } |
534 | ||
530f43a8 BT |
535 | int dlfb_handle_damage(struct dlfb_data *dev, int x, int y, |
536 | int width, int height, char *data) | |
7316bc55 | 537 | { |
7316bc55 | 538 | int i, ret; |
530f43a8 BT |
539 | char *cmd; |
540 | cycles_t start_cycles, end_cycles; | |
541 | int bytes_sent = 0; | |
542 | int bytes_identical = 0; | |
543 | struct urb *urb; | |
544 | int aligned_x; | |
545 | ||
546 | start_cycles = get_cycles(); | |
547 | ||
548 | aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long)); | |
549 | width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long)); | |
550 | x = aligned_x; | |
551 | ||
552 | if ((width <= 0) || | |
553 | (x + width > dev->info->var.xres) || | |
554 | (y + height > dev->info->var.yres)) | |
555 | return -EINVAL; | |
7316bc55 | 556 | |
530f43a8 BT |
557 | if (!atomic_read(&dev->usb_active)) |
558 | return 0; | |
7316bc55 | 559 | |
530f43a8 BT |
560 | urb = dlfb_get_urb(dev); |
561 | if (!urb) | |
562 | return 0; | |
563 | cmd = urb->transfer_buffer; | |
7316bc55 | 564 | |
530f43a8 BT |
565 | for (i = y; i < y + height ; i++) { |
566 | const int line_offset = dev->info->fix.line_length * i; | |
567 | const int byte_offset = line_offset + (x * BPP); | |
7316bc55 | 568 | |
5bea1fbf BT |
569 | if (dlfb_render_hline(dev, &urb, |
570 | (char *) dev->info->fix.smem_start, | |
2685cffa | 571 | &cmd, byte_offset, width * BPP, |
5bea1fbf BT |
572 | &bytes_identical, &bytes_sent)) |
573 | goto error; | |
7316bc55 RDI |
574 | } |
575 | ||
530f43a8 BT |
576 | if (cmd > (char *) urb->transfer_buffer) { |
577 | /* Send partial buffer remaining before exiting */ | |
578 | int len = cmd - (char *) urb->transfer_buffer; | |
579 | ret = dlfb_submit_urb(dev, urb, len); | |
580 | bytes_sent += len; | |
581 | } else | |
582 | dlfb_urb_completion(urb); | |
583 | ||
5bea1fbf | 584 | error: |
530f43a8 BT |
585 | atomic_add(bytes_sent, &dev->bytes_sent); |
586 | atomic_add(bytes_identical, &dev->bytes_identical); | |
587 | atomic_add(width*height*2, &dev->bytes_rendered); | |
588 | end_cycles = get_cycles(); | |
589 | atomic_add(((unsigned int) ((end_cycles - start_cycles) | |
590 | >> 10)), /* Kcycles */ | |
591 | &dev->cpu_kcycles_used); | |
7316bc55 | 592 | |
530f43a8 | 593 | return 0; |
7316bc55 RDI |
594 | } |
595 | ||
d46ecb9f BT |
596 | /* |
597 | * Path triggered by usermode clients who write to filesystem | |
598 | * e.g. cat filename > /dev/fb1 | |
599 | * Not used by X Windows or text-mode console. But useful for testing. | |
600 | * Slow because of extra copy and we must assume all pixels dirty. | |
601 | */ | |
602 | static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf, | |
603 | size_t count, loff_t *ppos) | |
604 | { | |
1a3e528c | 605 | ssize_t result; |
d46ecb9f BT |
606 | struct dlfb_data *dev = info->par; |
607 | u32 offset = (u32) *ppos; | |
608 | ||
d46ecb9f BT |
609 | result = fb_sys_write(info, buf, count, ppos); |
610 | ||
611 | if (result > 0) { | |
612 | int start = max((int)(offset / info->fix.line_length) - 1, 0); | |
613 | int lines = min((u32)((result / info->fix.line_length) + 1), | |
614 | (u32)info->var.yres); | |
615 | ||
616 | dlfb_handle_damage(dev, 0, start, info->var.xres, | |
617 | lines, info->screen_base); | |
618 | } | |
d46ecb9f BT |
619 | |
620 | return result; | |
621 | } | |
622 | ||
530f43a8 BT |
623 | /* hardware has native COPY command (see libdlo), but not worth it for fbcon */ |
624 | static void dlfb_ops_copyarea(struct fb_info *info, | |
625 | const struct fb_copyarea *area) | |
88e58b1a | 626 | { |
88e58b1a | 627 | |
530f43a8 | 628 | struct dlfb_data *dev = info->par; |
88e58b1a | 629 | |
530f43a8 | 630 | sys_copyarea(info, area); |
88e58b1a | 631 | |
530f43a8 BT |
632 | dlfb_handle_damage(dev, area->dx, area->dy, |
633 | area->width, area->height, info->screen_base); | |
530f43a8 | 634 | } |
88e58b1a | 635 | |
530f43a8 BT |
636 | static void dlfb_ops_imageblit(struct fb_info *info, |
637 | const struct fb_image *image) | |
638 | { | |
639 | struct dlfb_data *dev = info->par; | |
88e58b1a | 640 | |
530f43a8 | 641 | sys_imageblit(info, image); |
88e58b1a | 642 | |
530f43a8 BT |
643 | dlfb_handle_damage(dev, image->dx, image->dy, |
644 | image->width, image->height, info->screen_base); | |
88e58b1a RDI |
645 | } |
646 | ||
530f43a8 BT |
647 | static void dlfb_ops_fillrect(struct fb_info *info, |
648 | const struct fb_fillrect *rect) | |
88e58b1a | 649 | { |
88e58b1a RDI |
650 | struct dlfb_data *dev = info->par; |
651 | ||
530f43a8 | 652 | sys_fillrect(info, rect); |
88e58b1a | 653 | |
530f43a8 BT |
654 | dlfb_handle_damage(dev, rect->dx, rect->dy, rect->width, |
655 | rect->height, info->screen_base); | |
88e58b1a RDI |
656 | } |
657 | ||
d5ed5432 BT |
658 | /* |
659 | * NOTE: fb_defio.c is holding info->fbdefio.mutex | |
660 | * Touching ANY framebuffer memory that triggers a page fault | |
661 | * in fb_defio will cause a deadlock, when it also tries to | |
662 | * grab the same mutex. | |
663 | */ | |
664 | static void dlfb_dpy_deferred_io(struct fb_info *info, | |
665 | struct list_head *pagelist) | |
666 | { | |
667 | struct page *cur; | |
668 | struct fb_deferred_io *fbdefio = info->fbdefio; | |
669 | struct dlfb_data *dev = info->par; | |
670 | struct urb *urb; | |
671 | char *cmd; | |
672 | cycles_t start_cycles, end_cycles; | |
673 | int bytes_sent = 0; | |
674 | int bytes_identical = 0; | |
675 | int bytes_rendered = 0; | |
676 | ||
677 | if (!fb_defio) | |
678 | return; | |
679 | ||
680 | if (!atomic_read(&dev->usb_active)) | |
681 | return; | |
682 | ||
683 | start_cycles = get_cycles(); | |
684 | ||
685 | urb = dlfb_get_urb(dev); | |
686 | if (!urb) | |
687 | return; | |
688 | ||
689 | cmd = urb->transfer_buffer; | |
690 | ||
691 | /* walk the written page list and render each to device */ | |
692 | list_for_each_entry(cur, &fbdefio->pagelist, lru) { | |
693 | ||
5bea1fbf | 694 | if (dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start, |
d5ed5432 | 695 | &cmd, cur->index << PAGE_SHIFT, |
5bea1fbf BT |
696 | PAGE_SIZE, &bytes_identical, &bytes_sent)) |
697 | goto error; | |
d5ed5432 BT |
698 | bytes_rendered += PAGE_SIZE; |
699 | } | |
700 | ||
701 | if (cmd > (char *) urb->transfer_buffer) { | |
702 | /* Send partial buffer remaining before exiting */ | |
703 | int len = cmd - (char *) urb->transfer_buffer; | |
704 | dlfb_submit_urb(dev, urb, len); | |
705 | bytes_sent += len; | |
706 | } else | |
707 | dlfb_urb_completion(urb); | |
708 | ||
5bea1fbf | 709 | error: |
d5ed5432 BT |
710 | atomic_add(bytes_sent, &dev->bytes_sent); |
711 | atomic_add(bytes_identical, &dev->bytes_identical); | |
712 | atomic_add(bytes_rendered, &dev->bytes_rendered); | |
713 | end_cycles = get_cycles(); | |
714 | atomic_add(((unsigned int) ((end_cycles - start_cycles) | |
715 | >> 10)), /* Kcycles */ | |
716 | &dev->cpu_kcycles_used); | |
717 | } | |
718 | ||
18dffdf8 | 719 | static int dlfb_get_edid(struct dlfb_data *dev, char *edid, int len) |
7d9485e2 BT |
720 | { |
721 | int i; | |
722 | int ret; | |
18dffdf8 | 723 | char *rbuf; |
7d9485e2 | 724 | |
18dffdf8 BT |
725 | rbuf = kmalloc(2, GFP_KERNEL); |
726 | if (!rbuf) | |
727 | return 0; | |
728 | ||
729 | for (i = 0; i < len; i++) { | |
7d9485e2 BT |
730 | ret = usb_control_msg(dev->udev, |
731 | usb_rcvctrlpipe(dev->udev, 0), (0x02), | |
732 | (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2, | |
18dffdf8 BT |
733 | HZ); |
734 | if (ret < 1) { | |
735 | dl_err("Read EDID byte %d failed err %x\n", i, ret); | |
736 | i--; | |
737 | break; | |
738 | } | |
739 | edid[i] = rbuf[1]; | |
7d9485e2 | 740 | } |
18dffdf8 BT |
741 | |
742 | kfree(rbuf); | |
743 | ||
744 | return i; | |
7d9485e2 BT |
745 | } |
746 | ||
4574203f | 747 | static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd, |
530f43a8 | 748 | unsigned long arg) |
88e58b1a | 749 | { |
530f43a8 BT |
750 | |
751 | struct dlfb_data *dev = info->par; | |
7316bc55 | 752 | struct dloarea *area = NULL; |
88e58b1a | 753 | |
530f43a8 BT |
754 | if (!atomic_read(&dev->usb_active)) |
755 | return 0; | |
756 | ||
757 | /* TODO: Update X server to get this from sysfs instead */ | |
758 | if (cmd == DLFB_IOCTL_RETURN_EDID) { | |
7316bc55 | 759 | char *edid = (char *)arg; |
18dffdf8 | 760 | if (copy_to_user(edid, dev->edid, dev->edid_size)) |
7316bc55 | 761 | return -EFAULT; |
7316bc55 RDI |
762 | return 0; |
763 | } | |
764 | ||
530f43a8 BT |
765 | /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ |
766 | if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { | |
88e58b1a | 767 | |
5bea1fbf BT |
768 | /* |
769 | * If we have a damage-aware client, turn fb_defio "off" | |
770 | * To avoid perf imact of unecessary page fault handling. | |
771 | * Done by resetting the delay for this fb_info to a very | |
772 | * long period. Pages will become writable and stay that way. | |
773 | * Reset to normal value when all clients have closed this fb. | |
774 | */ | |
775 | if (info->fbdefio) | |
776 | info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE; | |
777 | ||
88e58b1a RDI |
778 | area = (struct dloarea *)arg; |
779 | ||
780 | if (area->x < 0) | |
781 | area->x = 0; | |
782 | ||
783 | if (area->x > info->var.xres) | |
784 | area->x = info->var.xres; | |
785 | ||
786 | if (area->y < 0) | |
787 | area->y = 0; | |
788 | ||
789 | if (area->y > info->var.yres) | |
790 | area->y = info->var.yres; | |
791 | ||
530f43a8 | 792 | dlfb_handle_damage(dev, area->x, area->y, area->w, area->h, |
88e58b1a RDI |
793 | info->screen_base); |
794 | } | |
7316bc55 | 795 | |
88e58b1a RDI |
796 | return 0; |
797 | } | |
798 | ||
f05e0575 | 799 | /* taken from vesafb */ |
88e58b1a | 800 | static int |
4574203f | 801 | dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green, |
88e58b1a RDI |
802 | unsigned blue, unsigned transp, struct fb_info *info) |
803 | { | |
804 | int err = 0; | |
805 | ||
806 | if (regno >= info->cmap.len) | |
807 | return 1; | |
808 | ||
809 | if (regno < 16) { | |
810 | if (info->var.red.offset == 10) { | |
811 | /* 1:5:5:5 */ | |
812 | ((u32 *) (info->pseudo_palette))[regno] = | |
813 | ((red & 0xf800) >> 1) | | |
814 | ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); | |
815 | } else { | |
816 | /* 0:5:6:5 */ | |
817 | ((u32 *) (info->pseudo_palette))[regno] = | |
818 | ((red & 0xf800)) | | |
819 | ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); | |
820 | } | |
821 | } | |
822 | ||
823 | return err; | |
824 | } | |
825 | ||
3e8f3d6f BT |
826 | /* |
827 | * It's common for several clients to have framebuffer open simultaneously. | |
828 | * e.g. both fbcon and X. Makes things interesting. | |
33077b8d | 829 | * Assumes caller is holding info->lock (for open and release at least) |
3e8f3d6f BT |
830 | */ |
831 | static int dlfb_ops_open(struct fb_info *info, int user) | |
832 | { | |
833 | struct dlfb_data *dev = info->par; | |
834 | ||
d5ed5432 BT |
835 | /* |
836 | * fbcon aggressively connects to first framebuffer it finds, | |
837 | * preventing other clients (X) from working properly. Usually | |
838 | * not what the user wants. Fail by default with option to enable. | |
839 | */ | |
840 | if ((user == 0) & (!console)) | |
841 | return -EBUSY; | |
3e8f3d6f | 842 | |
33077b8d BT |
843 | /* If the USB device is gone, we don't accept new opens */ |
844 | if (dev->virtualized) | |
845 | return -ENODEV; | |
3e8f3d6f BT |
846 | |
847 | dev->fb_count++; | |
848 | ||
33077b8d BT |
849 | kref_get(&dev->kref); |
850 | ||
d5ed5432 | 851 | if (fb_defio && (info->fbdefio == NULL)) { |
5bea1fbf BT |
852 | /* enable defio at last moment if not disabled by client */ |
853 | ||
854 | struct fb_deferred_io *fbdefio; | |
855 | ||
31a9f47a | 856 | fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL); |
5bea1fbf BT |
857 | |
858 | if (fbdefio) { | |
859 | fbdefio->delay = DL_DEFIO_WRITE_DELAY; | |
860 | fbdefio->deferred_io = dlfb_dpy_deferred_io; | |
861 | } | |
862 | ||
863 | info->fbdefio = fbdefio; | |
3e8f3d6f BT |
864 | fb_deferred_io_init(info); |
865 | } | |
3e8f3d6f BT |
866 | |
867 | dl_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n", | |
868 | info->node, user, info, dev->fb_count); | |
869 | ||
88e58b1a RDI |
870 | return 0; |
871 | } | |
872 | ||
4a4854dd BT |
873 | /* |
874 | * Called when all client interfaces to start transactions have been disabled, | |
875 | * and all references to our device instance (dlfb_data) are released. | |
876 | * Every transaction must have a reference, so we know are fully spun down | |
877 | */ | |
33077b8d | 878 | static void dlfb_free(struct kref *kref) |
4a4854dd BT |
879 | { |
880 | struct dlfb_data *dev = container_of(kref, struct dlfb_data, kref); | |
881 | ||
33077b8d BT |
882 | /* this function will wait for all in-flight urbs to complete */ |
883 | if (dev->urbs.count > 0) | |
884 | dlfb_free_urb_list(dev); | |
885 | ||
4a4854dd BT |
886 | if (dev->backing_buffer) |
887 | vfree(dev->backing_buffer); | |
888 | ||
33077b8d BT |
889 | kfree(dev->edid); |
890 | ||
891 | dl_warn("freeing dlfb_data %p\n", dev); | |
3e8f3d6f | 892 | |
4a4854dd BT |
893 | kfree(dev); |
894 | } | |
895 | ||
5bea1fbf BT |
896 | static void dlfb_release_urb_work(struct work_struct *work) |
897 | { | |
898 | struct urb_node *unode = container_of(work, struct urb_node, | |
899 | release_urb_work.work); | |
900 | ||
901 | up(&unode->dev->urbs.limit_sem); | |
902 | } | |
33077b8d BT |
903 | |
904 | static void dlfb_free_framebuffer_work(struct work_struct *work) | |
2469d5db | 905 | { |
33077b8d BT |
906 | struct dlfb_data *dev = container_of(work, struct dlfb_data, |
907 | free_framebuffer_work.work); | |
908 | struct fb_info *info = dev->info; | |
909 | int node = info->node; | |
910 | ||
911 | unregister_framebuffer(info); | |
2469d5db BT |
912 | |
913 | if (info->cmap.len != 0) | |
914 | fb_dealloc_cmap(&info->cmap); | |
915 | if (info->monspecs.modedb) | |
916 | fb_destroy_modedb(info->monspecs.modedb); | |
917 | if (info->screen_base) | |
918 | vfree(info->screen_base); | |
919 | ||
920 | fb_destroy_modelist(&info->modelist); | |
921 | ||
33077b8d BT |
922 | dev->info = 0; |
923 | ||
924 | /* Assume info structure is freed after this point */ | |
2469d5db BT |
925 | framebuffer_release(info); |
926 | ||
33077b8d BT |
927 | dl_warn("fb_info for /dev/fb%d has been freed\n", node); |
928 | ||
929 | /* ref taken in probe() as part of registering framebfufer */ | |
930 | kref_put(&dev->kref, dlfb_free); | |
931 | } | |
932 | ||
933 | /* | |
934 | * Assumes caller is holding info->lock mutex (for open and release at least) | |
935 | */ | |
936 | static int dlfb_ops_release(struct fb_info *info, int user) | |
937 | { | |
938 | struct dlfb_data *dev = info->par; | |
939 | ||
940 | dev->fb_count--; | |
941 | ||
942 | /* We can't free fb_info here - fbmem will touch it when we return */ | |
943 | if (dev->virtualized && (dev->fb_count == 0)) | |
944 | schedule_delayed_work(&dev->free_framebuffer_work, HZ); | |
945 | ||
33077b8d BT |
946 | if ((dev->fb_count == 0) && (info->fbdefio)) { |
947 | fb_deferred_io_cleanup(info); | |
948 | kfree(info->fbdefio); | |
949 | info->fbdefio = NULL; | |
950 | info->fbops->fb_mmap = dlfb_ops_mmap; | |
951 | } | |
33077b8d BT |
952 | |
953 | dl_warn("released /dev/fb%d user=%d count=%d\n", | |
954 | info->node, user, dev->fb_count); | |
955 | ||
956 | kref_put(&dev->kref, dlfb_free); | |
957 | ||
958 | return 0; | |
2469d5db BT |
959 | } |
960 | ||
7d9485e2 BT |
961 | /* |
962 | * Check whether a video mode is supported by the DisplayLink chip | |
963 | * We start from monitor's modes, so don't need to filter that here | |
964 | */ | |
965 | static int dlfb_is_valid_mode(struct fb_videomode *mode, | |
966 | struct fb_info *info) | |
967 | { | |
968 | struct dlfb_data *dev = info->par; | |
969 | ||
18dffdf8 BT |
970 | if (mode->xres * mode->yres > dev->sku_pixel_limit) { |
971 | dl_warn("%dx%d beyond chip capabilities\n", | |
972 | mode->xres, mode->yres); | |
7d9485e2 | 973 | return 0; |
18dffdf8 BT |
974 | } |
975 | ||
976 | dl_info("%dx%d valid mode\n", mode->xres, mode->yres); | |
7d9485e2 BT |
977 | |
978 | return 1; | |
979 | } | |
980 | ||
981 | static void dlfb_var_color_format(struct fb_var_screeninfo *var) | |
982 | { | |
983 | const struct fb_bitfield red = { 11, 5, 0 }; | |
984 | const struct fb_bitfield green = { 5, 6, 0 }; | |
985 | const struct fb_bitfield blue = { 0, 5, 0 }; | |
986 | ||
987 | var->bits_per_pixel = 16; | |
988 | var->red = red; | |
989 | var->green = green; | |
990 | var->blue = blue; | |
991 | } | |
992 | ||
2469d5db BT |
993 | static int dlfb_ops_check_var(struct fb_var_screeninfo *var, |
994 | struct fb_info *info) | |
995 | { | |
996 | struct fb_videomode mode; | |
997 | ||
998 | /* TODO: support dynamically changing framebuffer size */ | |
999 | if ((var->xres * var->yres * 2) > info->fix.smem_len) | |
1000 | return -EINVAL; | |
1001 | ||
1002 | /* set device-specific elements of var unrelated to mode */ | |
1003 | dlfb_var_color_format(var); | |
1004 | ||
1005 | fb_var_to_videomode(&mode, var); | |
1006 | ||
1007 | if (!dlfb_is_valid_mode(&mode, info)) | |
1008 | return -EINVAL; | |
1009 | ||
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | static int dlfb_ops_set_par(struct fb_info *info) | |
1014 | { | |
1015 | struct dlfb_data *dev = info->par; | |
18dffdf8 BT |
1016 | int result; |
1017 | u16 *pix_framebuffer; | |
1018 | int i; | |
2469d5db BT |
1019 | |
1020 | dl_notice("set_par mode %dx%d\n", info->var.xres, info->var.yres); | |
1021 | ||
18dffdf8 BT |
1022 | result = dlfb_set_video_mode(dev, &info->var); |
1023 | ||
1024 | if ((result == 0) && (dev->fb_count == 0)) { | |
1025 | ||
1026 | /* paint greenscreen */ | |
1027 | ||
1028 | pix_framebuffer = (u16 *) info->screen_base; | |
1029 | for (i = 0; i < info->fix.smem_len / 2; i++) | |
1030 | pix_framebuffer[i] = 0x37e6; | |
1031 | ||
1032 | dlfb_handle_damage(dev, 0, 0, info->var.xres, info->var.yres, | |
1033 | info->screen_base); | |
1034 | } | |
1035 | ||
1036 | return result; | |
2469d5db BT |
1037 | } |
1038 | ||
9825f70f BT |
1039 | /* |
1040 | * In order to come back from full DPMS off, we need to set the mode again | |
1041 | */ | |
4574203f | 1042 | static int dlfb_ops_blank(int blank_mode, struct fb_info *info) |
f05e0575 | 1043 | { |
530f43a8 | 1044 | struct dlfb_data *dev = info->par; |
7316bc55 | 1045 | |
9825f70f BT |
1046 | if (blank_mode != FB_BLANK_UNBLANK) { |
1047 | char *bufptr; | |
1048 | struct urb *urb; | |
530f43a8 | 1049 | |
9825f70f BT |
1050 | urb = dlfb_get_urb(dev); |
1051 | if (!urb) | |
1052 | return 0; | |
530f43a8 | 1053 | |
9825f70f BT |
1054 | bufptr = (char *) urb->transfer_buffer; |
1055 | bufptr = dlfb_vidreg_lock(bufptr); | |
530f43a8 | 1056 | bufptr = dlfb_enable_hvsync(bufptr, false); |
9825f70f BT |
1057 | bufptr = dlfb_vidreg_unlock(bufptr); |
1058 | ||
1059 | dlfb_submit_urb(dev, urb, bufptr - | |
1060 | (char *) urb->transfer_buffer); | |
7316bc55 | 1061 | } else { |
9825f70f | 1062 | dlfb_set_video_mode(dev, &info->var); |
7316bc55 | 1063 | } |
7316bc55 | 1064 | |
88e58b1a RDI |
1065 | return 0; |
1066 | } | |
1067 | ||
1068 | static struct fb_ops dlfb_ops = { | |
2469d5db | 1069 | .owner = THIS_MODULE, |
1a3e528c | 1070 | .fb_read = fb_sys_read, |
d46ecb9f | 1071 | .fb_write = dlfb_ops_write, |
4574203f BT |
1072 | .fb_setcolreg = dlfb_ops_setcolreg, |
1073 | .fb_fillrect = dlfb_ops_fillrect, | |
1074 | .fb_copyarea = dlfb_ops_copyarea, | |
1075 | .fb_imageblit = dlfb_ops_imageblit, | |
1076 | .fb_mmap = dlfb_ops_mmap, | |
1077 | .fb_ioctl = dlfb_ops_ioctl, | |
3e8f3d6f | 1078 | .fb_open = dlfb_ops_open, |
4574203f BT |
1079 | .fb_release = dlfb_ops_release, |
1080 | .fb_blank = dlfb_ops_blank, | |
2469d5db BT |
1081 | .fb_check_var = dlfb_ops_check_var, |
1082 | .fb_set_par = dlfb_ops_set_par, | |
88e58b1a RDI |
1083 | }; |
1084 | ||
18dffdf8 | 1085 | |
7d9485e2 | 1086 | /* |
18dffdf8 BT |
1087 | * Assumes &info->lock held by caller |
1088 | * Assumes no active clients have framebuffer open | |
1089 | */ | |
1090 | static int dlfb_realloc_framebuffer(struct dlfb_data *dev, struct fb_info *info) | |
1091 | { | |
1092 | int retval = -ENOMEM; | |
1093 | int old_len = info->fix.smem_len; | |
1094 | int new_len; | |
1095 | unsigned char *old_fb = info->screen_base; | |
1096 | unsigned char *new_fb; | |
1097 | unsigned char *new_back; | |
1098 | ||
1099 | dl_warn("Reallocating framebuffer. Addresses will change!\n"); | |
1100 | ||
1101 | new_len = info->fix.line_length * info->var.yres; | |
1102 | ||
1103 | if (PAGE_ALIGN(new_len) > old_len) { | |
1104 | /* | |
1105 | * Alloc system memory for virtual framebuffer | |
1106 | */ | |
1107 | new_fb = vmalloc(new_len); | |
1108 | if (!new_fb) { | |
1109 | dl_err("Virtual framebuffer alloc failed\n"); | |
1110 | goto error; | |
1111 | } | |
1112 | ||
1113 | if (info->screen_base) { | |
1114 | memcpy(new_fb, old_fb, old_len); | |
1115 | vfree(info->screen_base); | |
1116 | } | |
1117 | ||
1118 | info->screen_base = new_fb; | |
1119 | info->fix.smem_len = PAGE_ALIGN(new_len); | |
1120 | info->fix.smem_start = (unsigned long) new_fb; | |
1121 | info->flags = udlfb_info_flags; | |
1122 | ||
1123 | /* | |
1124 | * Second framebuffer copy to mirror the framebuffer state | |
1125 | * on the physical USB device. We can function without this. | |
1126 | * But with imperfect damage info we may send pixels over USB | |
1127 | * that were, in fact, unchanged - wasting limited USB bandwidth | |
1128 | */ | |
1129 | new_back = vmalloc(new_len); | |
1130 | if (!new_back) | |
1131 | dl_info("No shadow/backing buffer allcoated\n"); | |
1132 | else { | |
1133 | if (dev->backing_buffer) | |
1134 | vfree(dev->backing_buffer); | |
1135 | dev->backing_buffer = new_back; | |
1136 | memset(dev->backing_buffer, 0, new_len); | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | retval = 0; | |
1141 | ||
1142 | error: | |
1143 | return retval; | |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * 1) Get EDID from hw, or use sw default | |
1148 | * 2) Parse into various fb_info structs | |
1149 | * 3) Allocate virtual framebuffer memory to back highest res mode | |
1150 | * | |
1151 | * Parses EDID into three places used by various parts of fbdev: | |
7d9485e2 BT |
1152 | * fb_var_screeninfo contains the timing of the monitor's preferred mode |
1153 | * fb_info.monspecs is full parsed EDID info, including monspecs.modedb | |
1154 | * fb_info.modelist is a linked list of all monitor & VESA modes which work | |
1155 | * | |
1156 | * If EDID is not readable/valid, then modelist is all VESA modes, | |
1157 | * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode | |
18dffdf8 | 1158 | * Returns 0 if successful |
7d9485e2 | 1159 | */ |
18dffdf8 BT |
1160 | static int dlfb_setup_modes(struct dlfb_data *dev, |
1161 | struct fb_info *info, | |
1162 | char *default_edid, size_t default_edid_size) | |
7d9485e2 BT |
1163 | { |
1164 | int i; | |
1165 | const struct fb_videomode *default_vmode = NULL; | |
1166 | int result = 0; | |
18dffdf8 BT |
1167 | char *edid; |
1168 | int tries = 3; | |
1169 | ||
1170 | if (info->dev) /* only use mutex if info has been registered */ | |
1171 | mutex_lock(&info->lock); | |
1172 | ||
b9f03a3c | 1173 | edid = kmalloc(EDID_LENGTH, GFP_KERNEL); |
18dffdf8 BT |
1174 | if (!edid) { |
1175 | result = -ENOMEM; | |
1176 | goto error; | |
1177 | } | |
7d9485e2 BT |
1178 | |
1179 | fb_destroy_modelist(&info->modelist); | |
1180 | memset(&info->monspecs, 0, sizeof(info->monspecs)); | |
1181 | ||
18dffdf8 BT |
1182 | /* |
1183 | * Try to (re)read EDID from hardware first | |
1184 | * EDID data may return, but not parse as valid | |
1185 | * Try again a few times, in case of e.g. analog cable noise | |
1186 | */ | |
1187 | while (tries--) { | |
1188 | ||
b9f03a3c | 1189 | i = dlfb_get_edid(dev, edid, EDID_LENGTH); |
18dffdf8 | 1190 | |
b9f03a3c | 1191 | if (i >= EDID_LENGTH) |
18dffdf8 BT |
1192 | fb_edid_to_monspecs(edid, &info->monspecs); |
1193 | ||
1194 | if (info->monspecs.modedb_len > 0) { | |
1195 | dev->edid = edid; | |
1196 | dev->edid_size = i; | |
1197 | break; | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | /* If that fails, use a previously returned EDID if available */ | |
1202 | if (info->monspecs.modedb_len == 0) { | |
1203 | ||
1204 | dl_err("Unable to get valid EDID from device/display\n"); | |
1205 | ||
1206 | if (dev->edid) { | |
1207 | fb_edid_to_monspecs(dev->edid, &info->monspecs); | |
1208 | if (info->monspecs.modedb_len > 0) | |
1209 | dl_err("Using previously queried EDID\n"); | |
1210 | } | |
1211 | } | |
1212 | ||
1213 | /* If that fails, use the default EDID we were handed */ | |
1214 | if (info->monspecs.modedb_len == 0) { | |
b9f03a3c | 1215 | if (default_edid_size >= EDID_LENGTH) { |
18dffdf8 BT |
1216 | fb_edid_to_monspecs(default_edid, &info->monspecs); |
1217 | if (info->monspecs.modedb_len > 0) { | |
1218 | memcpy(edid, default_edid, default_edid_size); | |
1219 | dev->edid = edid; | |
1220 | dev->edid_size = default_edid_size; | |
1221 | dl_err("Using default/backup EDID\n"); | |
1222 | } | |
1223 | } | |
1224 | } | |
7d9485e2 | 1225 | |
18dffdf8 | 1226 | /* If we've got modes, let's pick a best default mode */ |
7d9485e2 BT |
1227 | if (info->monspecs.modedb_len > 0) { |
1228 | ||
1229 | for (i = 0; i < info->monspecs.modedb_len; i++) { | |
1230 | if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info)) | |
1231 | fb_add_videomode(&info->monspecs.modedb[i], | |
1232 | &info->modelist); | |
18dffdf8 BT |
1233 | else /* if we've removed top/best mode */ |
1234 | info->monspecs.misc &= ~FB_MISC_1ST_DETAIL; | |
7d9485e2 BT |
1235 | } |
1236 | ||
1237 | default_vmode = fb_find_best_display(&info->monspecs, | |
1238 | &info->modelist); | |
18dffdf8 | 1239 | } |
7d9485e2 | 1240 | |
18dffdf8 BT |
1241 | /* If everything else has failed, fall back to safe default mode */ |
1242 | if (default_vmode == NULL) { | |
1243 | ||
1244 | struct fb_videomode fb_vmode = {0}; | |
7d9485e2 BT |
1245 | |
1246 | /* | |
1247 | * Add the standard VESA modes to our modelist | |
1248 | * Since we don't have EDID, there may be modes that | |
1249 | * overspec monitor and/or are incorrect aspect ratio, etc. | |
1250 | * But at least the user has a chance to choose | |
1251 | */ | |
1252 | for (i = 0; i < VESA_MODEDB_SIZE; i++) { | |
1253 | if (dlfb_is_valid_mode((struct fb_videomode *) | |
1254 | &vesa_modes[i], info)) | |
1255 | fb_add_videomode(&vesa_modes[i], | |
1256 | &info->modelist); | |
1257 | } | |
1258 | ||
1259 | /* | |
1260 | * default to resolution safe for projectors | |
1261 | * (since they are most common case without EDID) | |
1262 | */ | |
1263 | fb_vmode.xres = 800; | |
1264 | fb_vmode.yres = 600; | |
1265 | fb_vmode.refresh = 60; | |
1266 | default_vmode = fb_find_nearest_mode(&fb_vmode, | |
1267 | &info->modelist); | |
1268 | } | |
1269 | ||
18dffdf8 BT |
1270 | /* If we have good mode and no active clients*/ |
1271 | if ((default_vmode != NULL) && (dev->fb_count == 0)) { | |
1272 | ||
1273 | fb_videomode_to_var(&info->var, default_vmode); | |
1274 | dlfb_var_color_format(&info->var); | |
1275 | ||
1276 | /* | |
1277 | * with mode size info, we can now alloc our framebuffer. | |
1278 | */ | |
1279 | memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix)); | |
1280 | info->fix.line_length = info->var.xres * | |
1281 | (info->var.bits_per_pixel / 8); | |
1282 | ||
1283 | result = dlfb_realloc_framebuffer(dev, info); | |
1284 | ||
1285 | } else | |
1286 | result = -EINVAL; | |
1287 | ||
1288 | error: | |
1289 | if (edid && (dev->edid != edid)) | |
1290 | kfree(edid); | |
1291 | ||
1292 | if (info->dev) | |
1293 | mutex_unlock(&info->lock); | |
7d9485e2 BT |
1294 | |
1295 | return result; | |
1296 | } | |
1297 | ||
1298 | static ssize_t metrics_bytes_rendered_show(struct device *fbdev, | |
1299 | struct device_attribute *a, char *buf) { | |
1300 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1301 | struct dlfb_data *dev = fb_info->par; | |
1302 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1303 | atomic_read(&dev->bytes_rendered)); | |
1304 | } | |
1305 | ||
1306 | static ssize_t metrics_bytes_identical_show(struct device *fbdev, | |
1307 | struct device_attribute *a, char *buf) { | |
1308 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1309 | struct dlfb_data *dev = fb_info->par; | |
1310 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1311 | atomic_read(&dev->bytes_identical)); | |
1312 | } | |
1313 | ||
1314 | static ssize_t metrics_bytes_sent_show(struct device *fbdev, | |
1315 | struct device_attribute *a, char *buf) { | |
1316 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1317 | struct dlfb_data *dev = fb_info->par; | |
1318 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1319 | atomic_read(&dev->bytes_sent)); | |
1320 | } | |
1321 | ||
1322 | static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev, | |
1323 | struct device_attribute *a, char *buf) { | |
1324 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1325 | struct dlfb_data *dev = fb_info->par; | |
1326 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1327 | atomic_read(&dev->cpu_kcycles_used)); | |
1328 | } | |
1329 | ||
18dffdf8 BT |
1330 | static ssize_t edid_show( |
1331 | struct file *filp, | |
1332 | struct kobject *kobj, struct bin_attribute *a, | |
7d9485e2 BT |
1333 | char *buf, loff_t off, size_t count) { |
1334 | struct device *fbdev = container_of(kobj, struct device, kobj); | |
1335 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1336 | struct dlfb_data *dev = fb_info->par; | |
7d9485e2 | 1337 | |
18dffdf8 | 1338 | if (dev->edid == NULL) |
7d9485e2 BT |
1339 | return 0; |
1340 | ||
18dffdf8 | 1341 | if ((off >= dev->edid_size) || (count > dev->edid_size)) |
7d9485e2 BT |
1342 | return 0; |
1343 | ||
18dffdf8 BT |
1344 | if (off + count > dev->edid_size) |
1345 | count = dev->edid_size - off; | |
1346 | ||
1347 | dl_info("sysfs edid copy %p to %p, %d bytes\n", | |
1348 | dev->edid, buf, (int) count); | |
1349 | ||
1350 | memcpy(buf, dev->edid, count); | |
7d9485e2 BT |
1351 | |
1352 | return count; | |
1353 | } | |
1354 | ||
8ef8cc4f BT |
1355 | static ssize_t edid_store( |
1356 | struct file *filp, | |
1357 | struct kobject *kobj, struct bin_attribute *a, | |
1358 | char *src, loff_t src_off, size_t src_size) { | |
1359 | struct device *fbdev = container_of(kobj, struct device, kobj); | |
1360 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1361 | struct dlfb_data *dev = fb_info->par; | |
1362 | ||
1363 | /* We only support write of entire EDID at once, no offset*/ | |
b9f03a3c | 1364 | if ((src_size != EDID_LENGTH) || (src_off != 0)) |
8ef8cc4f BT |
1365 | return 0; |
1366 | ||
1367 | dlfb_setup_modes(dev, fb_info, src, src_size); | |
1368 | ||
1369 | if (dev->edid && (memcmp(src, dev->edid, src_size) == 0)) { | |
1370 | dl_info("sysfs written EDID is new default\n"); | |
1371 | dlfb_ops_set_par(fb_info); | |
1372 | return src_size; | |
1373 | } else | |
1374 | return 0; | |
1375 | } | |
7d9485e2 BT |
1376 | |
1377 | static ssize_t metrics_reset_store(struct device *fbdev, | |
1378 | struct device_attribute *attr, | |
1379 | const char *buf, size_t count) | |
1380 | { | |
1381 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1382 | struct dlfb_data *dev = fb_info->par; | |
1383 | ||
1384 | atomic_set(&dev->bytes_rendered, 0); | |
1385 | atomic_set(&dev->bytes_identical, 0); | |
1386 | atomic_set(&dev->bytes_sent, 0); | |
1387 | atomic_set(&dev->cpu_kcycles_used, 0); | |
7d9485e2 BT |
1388 | |
1389 | return count; | |
1390 | } | |
1391 | ||
7d9485e2 BT |
1392 | static struct bin_attribute edid_attr = { |
1393 | .attr.name = "edid", | |
8ef8cc4f | 1394 | .attr.mode = 0666, |
b9f03a3c | 1395 | .size = EDID_LENGTH, |
7d9485e2 | 1396 | .read = edid_show, |
8ef8cc4f | 1397 | .write = edid_store |
7d9485e2 BT |
1398 | }; |
1399 | ||
1400 | static struct device_attribute fb_device_attrs[] = { | |
1401 | __ATTR_RO(metrics_bytes_rendered), | |
1402 | __ATTR_RO(metrics_bytes_identical), | |
1403 | __ATTR_RO(metrics_bytes_sent), | |
1404 | __ATTR_RO(metrics_cpu_kcycles_used), | |
7d9485e2 | 1405 | __ATTR(metrics_reset, S_IWUGO, NULL, metrics_reset_store), |
7d9485e2 BT |
1406 | }; |
1407 | ||
cc403dc6 BT |
1408 | /* |
1409 | * This is necessary before we can communicate with the display controller. | |
1410 | */ | |
1411 | static int dlfb_select_std_channel(struct dlfb_data *dev) | |
1412 | { | |
1413 | int ret; | |
1414 | u8 set_def_chn[] = { 0x57, 0xCD, 0xDC, 0xA7, | |
1415 | 0x1C, 0x88, 0x5E, 0x15, | |
1416 | 0x60, 0xFE, 0xC6, 0x97, | |
1417 | 0x16, 0x3D, 0x47, 0xF2 }; | |
1418 | ||
1419 | ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
1420 | NR_USB_REQUEST_CHANNEL, | |
1421 | (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, | |
1422 | set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT); | |
1423 | return ret; | |
1424 | } | |
1425 | ||
18dffdf8 BT |
1426 | static int dlfb_parse_vendor_descriptor(struct dlfb_data *dev, |
1427 | struct usb_device *usbdev) | |
1428 | { | |
1429 | char *desc; | |
1430 | char *buf; | |
1431 | char *desc_end; | |
1432 | ||
1433 | u8 total_len = 0; | |
1434 | ||
1435 | buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); | |
1436 | if (!buf) | |
1437 | return false; | |
1438 | desc = buf; | |
1439 | ||
1440 | total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */ | |
1441 | 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); | |
1442 | if (total_len > 5) { | |
1443 | dl_info("vendor descriptor length:%x data:%02x %02x %02x %02x" \ | |
1444 | "%02x %02x %02x %02x %02x %02x %02x\n", | |
1445 | total_len, desc[0], | |
1446 | desc[1], desc[2], desc[3], desc[4], desc[5], desc[6], | |
1447 | desc[7], desc[8], desc[9], desc[10]); | |
1448 | ||
1449 | if ((desc[0] != total_len) || /* descriptor length */ | |
1450 | (desc[1] != 0x5f) || /* vendor descriptor type */ | |
1451 | (desc[2] != 0x01) || /* version (2 bytes) */ | |
1452 | (desc[3] != 0x00) || | |
1453 | (desc[4] != total_len - 2)) /* length after type */ | |
1454 | goto unrecognized; | |
1455 | ||
1456 | desc_end = desc + total_len; | |
1457 | desc += 5; /* the fixed header we've already parsed */ | |
1458 | ||
1459 | while (desc < desc_end) { | |
1460 | u8 length; | |
1461 | u16 key; | |
1462 | ||
1463 | key = *((u16 *) desc); | |
1464 | desc += sizeof(u16); | |
1465 | length = *desc; | |
1466 | desc++; | |
1467 | ||
1468 | switch (key) { | |
1469 | case 0x0200: { /* max_area */ | |
1470 | u32 max_area; | |
1471 | max_area = le32_to_cpu(*((u32 *)desc)); | |
1472 | dl_warn("DL chip limited to %d pixel modes\n", | |
1473 | max_area); | |
1474 | dev->sku_pixel_limit = max_area; | |
1475 | break; | |
1476 | } | |
1477 | default: | |
1478 | break; | |
1479 | } | |
1480 | desc += length; | |
1481 | } | |
1482 | } | |
1483 | ||
1484 | goto success; | |
2469d5db | 1485 | |
18dffdf8 BT |
1486 | unrecognized: |
1487 | /* allow udlfb to load for now even if firmware unrecognized */ | |
1488 | dl_err("Unrecognized vendor firmware descriptor\n"); | |
1489 | ||
1490 | success: | |
1491 | kfree(buf); | |
1492 | return true; | |
1493 | } | |
2469d5db | 1494 | static int dlfb_usb_probe(struct usb_interface *interface, |
59277b67 | 1495 | const struct usb_device_id *id) |
88e58b1a | 1496 | { |
59277b67 | 1497 | struct usb_device *usbdev; |
18dffdf8 | 1498 | struct dlfb_data *dev = 0; |
33077b8d | 1499 | struct fb_info *info = 0; |
59277b67 | 1500 | int retval = -ENOMEM; |
2685cffa | 1501 | int i; |
59277b67 | 1502 | |
2469d5db BT |
1503 | /* usb initialization */ |
1504 | ||
1505 | usbdev = interface_to_usbdev(interface); | |
59277b67 BT |
1506 | |
1507 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1508 | if (dev == NULL) { | |
2469d5db BT |
1509 | err("dlfb_usb_probe: failed alloc of dev struct\n"); |
1510 | goto error; | |
88e58b1a | 1511 | } |
88e58b1a | 1512 | |
2469d5db BT |
1513 | /* we need to wait for both usb and fbdev to spin down on disconnect */ |
1514 | kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */ | |
18dffdf8 | 1515 | kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */ |
2469d5db | 1516 | |
59277b67 | 1517 | dev->udev = usbdev; |
4a4854dd | 1518 | dev->gdev = &usbdev->dev; /* our generic struct device * */ |
59277b67 BT |
1519 | usb_set_intfdata(interface, dev); |
1520 | ||
18dffdf8 BT |
1521 | dl_info("%s %s - serial #%s\n", |
1522 | usbdev->manufacturer, usbdev->product, usbdev->serial); | |
1523 | dl_info("vid_%04x&pid_%04x&rev_%04x driver's dlfb_data struct at %p\n", | |
1524 | usbdev->descriptor.idVendor, usbdev->descriptor.idProduct, | |
1525 | usbdev->descriptor.bcdDevice, dev); | |
d5ed5432 BT |
1526 | dl_info("console enable=%d\n", console); |
1527 | dl_info("fb_defio enable=%d\n", fb_defio); | |
18dffdf8 BT |
1528 | |
1529 | dev->sku_pixel_limit = 2048 * 1152; /* default to maximum */ | |
1530 | ||
1531 | if (!dlfb_parse_vendor_descriptor(dev, usbdev)) { | |
1532 | dl_err("firmware not recognized. Assume incompatible device\n"); | |
1533 | goto error; | |
1534 | } | |
1535 | ||
2469d5db BT |
1536 | if (!dlfb_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) { |
1537 | retval = -ENOMEM; | |
1538 | dl_err("dlfb_alloc_urb_list failed\n"); | |
1539 | goto error; | |
1540 | } | |
1541 | ||
2469d5db | 1542 | /* We don't register a new USB class. Our client interface is fbdev */ |
59277b67 | 1543 | |
2469d5db BT |
1544 | /* allocates framebuffer driver structure, not framebuffer memory */ |
1545 | info = framebuffer_alloc(0, &usbdev->dev); | |
1546 | if (!info) { | |
1547 | retval = -ENOMEM; | |
1548 | dl_err("framebuffer_alloc failed\n"); | |
1549 | goto error; | |
1550 | } | |
33077b8d | 1551 | |
59277b67 BT |
1552 | dev->info = info; |
1553 | info->par = dev; | |
1554 | info->pseudo_palette = dev->pseudo_palette; | |
2469d5db | 1555 | info->fbops = &dlfb_ops; |
59277b67 | 1556 | |
2469d5db BT |
1557 | retval = fb_alloc_cmap(&info->cmap, 256, 0); |
1558 | if (retval < 0) { | |
1559 | dl_err("fb_alloc_cmap failed %x\n", retval); | |
1560 | goto error; | |
1561 | } | |
88e58b1a | 1562 | |
33077b8d BT |
1563 | INIT_DELAYED_WORK(&dev->free_framebuffer_work, |
1564 | dlfb_free_framebuffer_work); | |
1565 | ||
18dffdf8 BT |
1566 | INIT_LIST_HEAD(&info->modelist); |
1567 | ||
1568 | retval = dlfb_setup_modes(dev, info, NULL, 0); | |
1569 | if (retval != 0) { | |
1570 | dl_err("unable to find common mode for display and adapter\n"); | |
1571 | goto error; | |
1572 | } | |
1573 | ||
2469d5db | 1574 | /* ready to begin using device */ |
88e58b1a | 1575 | |
2469d5db BT |
1576 | atomic_set(&dev->usb_active, 1); |
1577 | dlfb_select_std_channel(dev); | |
88e58b1a | 1578 | |
18dffdf8 | 1579 | dlfb_ops_check_var(&info->var, info); |
2469d5db | 1580 | dlfb_ops_set_par(info); |
88e58b1a | 1581 | |
2469d5db | 1582 | retval = register_framebuffer(info); |
59277b67 | 1583 | if (retval < 0) { |
2469d5db BT |
1584 | dl_err("register_framebuffer failed %d\n", retval); |
1585 | goto error; | |
7316bc55 | 1586 | } |
88e58b1a | 1587 | |
2469d5db BT |
1588 | for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) |
1589 | device_create_file(info->dev, &fb_device_attrs[i]); | |
88e58b1a | 1590 | |
2469d5db | 1591 | device_create_bin_file(info->dev, &edid_attr); |
88e58b1a | 1592 | |
18dffdf8 | 1593 | dl_info("DisplayLink USB device /dev/fb%d attached. %dx%d resolution." |
2469d5db | 1594 | " Using %dK framebuffer memory\n", info->node, |
18dffdf8 | 1595 | info->var.xres, info->var.yres, |
2469d5db | 1596 | ((dev->backing_buffer) ? |
18dffdf8 | 1597 | info->fix.smem_len * 2 : info->fix.smem_len) >> 10); |
88e58b1a RDI |
1598 | return 0; |
1599 | ||
2469d5db BT |
1600 | error: |
1601 | if (dev) { | |
2469d5db | 1602 | |
33077b8d BT |
1603 | if (info) { |
1604 | if (info->cmap.len != 0) | |
1605 | fb_dealloc_cmap(&info->cmap); | |
1606 | if (info->monspecs.modedb) | |
1607 | fb_destroy_modedb(info->monspecs.modedb); | |
1608 | if (info->screen_base) | |
1609 | vfree(info->screen_base); | |
1610 | ||
1611 | fb_destroy_modelist(&info->modelist); | |
1612 | ||
1613 | framebuffer_release(info); | |
1614 | } | |
1615 | ||
1616 | if (dev->backing_buffer) | |
1617 | vfree(dev->backing_buffer); | |
1618 | ||
1619 | kref_put(&dev->kref, dlfb_free); /* ref for framebuffer */ | |
1620 | kref_put(&dev->kref, dlfb_free); /* last ref from kref_init */ | |
2469d5db BT |
1621 | |
1622 | /* dev has been deallocated. Do not dereference */ | |
1623 | } | |
1624 | ||
59277b67 | 1625 | return retval; |
88e58b1a RDI |
1626 | } |
1627 | ||
2469d5db | 1628 | static void dlfb_usb_disconnect(struct usb_interface *interface) |
88e58b1a | 1629 | { |
59277b67 BT |
1630 | struct dlfb_data *dev; |
1631 | struct fb_info *info; | |
2469d5db | 1632 | int i; |
88e58b1a | 1633 | |
59277b67 | 1634 | dev = usb_get_intfdata(interface); |
2469d5db BT |
1635 | info = dev->info; |
1636 | ||
33077b8d | 1637 | dl_info("USB disconnect starting\n"); |
2469d5db | 1638 | |
33077b8d BT |
1639 | /* we virtualize until all fb clients release. Then we free */ |
1640 | dev->virtualized = true; | |
1641 | ||
1642 | /* When non-active we'll update virtual framebuffer, but no new urbs */ | |
1643 | atomic_set(&dev->usb_active, 0); | |
59277b67 | 1644 | |
33077b8d | 1645 | /* remove udlfb's sysfs interfaces */ |
2469d5db BT |
1646 | for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) |
1647 | device_remove_file(info->dev, &fb_device_attrs[i]); | |
2469d5db BT |
1648 | device_remove_bin_file(info->dev, &edid_attr); |
1649 | ||
33077b8d | 1650 | usb_set_intfdata(interface, NULL); |
59277b67 | 1651 | |
33077b8d BT |
1652 | /* if clients still have us open, will be freed on last close */ |
1653 | if (dev->fb_count == 0) | |
1654 | schedule_delayed_work(&dev->free_framebuffer_work, 0); | |
88e58b1a | 1655 | |
2469d5db | 1656 | /* release reference taken by kref_init in probe() */ |
33077b8d | 1657 | kref_put(&dev->kref, dlfb_free); |
88e58b1a | 1658 | |
2469d5db BT |
1659 | /* consider dlfb_data freed */ |
1660 | ||
1661 | return; | |
88e58b1a RDI |
1662 | } |
1663 | ||
1664 | static struct usb_driver dlfb_driver = { | |
1665 | .name = "udlfb", | |
2469d5db BT |
1666 | .probe = dlfb_usb_probe, |
1667 | .disconnect = dlfb_usb_disconnect, | |
88e58b1a RDI |
1668 | .id_table = id_table, |
1669 | }; | |
1670 | ||
2469d5db | 1671 | static int __init dlfb_module_init(void) |
88e58b1a RDI |
1672 | { |
1673 | int res; | |
1674 | ||
88e58b1a RDI |
1675 | res = usb_register(&dlfb_driver); |
1676 | if (res) | |
1677 | err("usb_register failed. Error number %d", res); | |
1678 | ||
88e58b1a RDI |
1679 | return res; |
1680 | } | |
1681 | ||
2469d5db | 1682 | static void __exit dlfb_module_exit(void) |
88e58b1a RDI |
1683 | { |
1684 | usb_deregister(&dlfb_driver); | |
1685 | } | |
1686 | ||
2469d5db BT |
1687 | module_init(dlfb_module_init); |
1688 | module_exit(dlfb_module_exit); | |
88e58b1a | 1689 | |
4a4854dd BT |
1690 | static void dlfb_urb_completion(struct urb *urb) |
1691 | { | |
1692 | struct urb_node *unode = urb->context; | |
1693 | struct dlfb_data *dev = unode->dev; | |
1694 | unsigned long flags; | |
1695 | ||
1696 | /* sync/async unlink faults aren't errors */ | |
1697 | if (urb->status) { | |
1698 | if (!(urb->status == -ENOENT || | |
1699 | urb->status == -ECONNRESET || | |
1700 | urb->status == -ESHUTDOWN)) { | |
1701 | dl_err("%s - nonzero write bulk status received: %d\n", | |
1702 | __func__, urb->status); | |
1703 | atomic_set(&dev->lost_pixels, 1); | |
1704 | } | |
1705 | } | |
1706 | ||
1707 | urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */ | |
1708 | ||
1709 | spin_lock_irqsave(&dev->urbs.lock, flags); | |
1710 | list_add_tail(&unode->entry, &dev->urbs.list); | |
1711 | dev->urbs.available++; | |
1712 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1713 | ||
5bea1fbf BT |
1714 | /* |
1715 | * When using fb_defio, we deadlock if up() is called | |
1716 | * while another is waiting. So queue to another process. | |
1717 | */ | |
1718 | if (fb_defio) | |
1719 | schedule_delayed_work(&unode->release_urb_work, 0); | |
1720 | else | |
1721 | up(&dev->urbs.limit_sem); | |
4a4854dd BT |
1722 | } |
1723 | ||
1724 | static void dlfb_free_urb_list(struct dlfb_data *dev) | |
1725 | { | |
1726 | int count = dev->urbs.count; | |
1727 | struct list_head *node; | |
1728 | struct urb_node *unode; | |
1729 | struct urb *urb; | |
1730 | int ret; | |
1731 | unsigned long flags; | |
1732 | ||
1733 | dl_notice("Waiting for completes and freeing all render urbs\n"); | |
1734 | ||
1735 | /* keep waiting and freeing, until we've got 'em all */ | |
1736 | while (count--) { | |
33077b8d BT |
1737 | |
1738 | /* Getting interrupted means a leak, but ok at shutdown*/ | |
1739 | ret = down_interruptible(&dev->urbs.limit_sem); | |
1740 | if (ret) | |
4a4854dd | 1741 | break; |
33077b8d | 1742 | |
4a4854dd BT |
1743 | spin_lock_irqsave(&dev->urbs.lock, flags); |
1744 | ||
1745 | node = dev->urbs.list.next; /* have reserved one with sem */ | |
1746 | list_del_init(node); | |
1747 | ||
1748 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1749 | ||
1750 | unode = list_entry(node, struct urb_node, entry); | |
1751 | urb = unode->urb; | |
1752 | ||
1753 | /* Free each separately allocated piece */ | |
c220cc3e GKH |
1754 | usb_free_coherent(urb->dev, dev->urbs.size, |
1755 | urb->transfer_buffer, urb->transfer_dma); | |
4a4854dd BT |
1756 | usb_free_urb(urb); |
1757 | kfree(node); | |
1758 | } | |
1759 | ||
4a4854dd BT |
1760 | } |
1761 | ||
1762 | static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size) | |
1763 | { | |
1764 | int i = 0; | |
1765 | struct urb *urb; | |
1766 | struct urb_node *unode; | |
1767 | char *buf; | |
1768 | ||
1769 | spin_lock_init(&dev->urbs.lock); | |
1770 | ||
1771 | dev->urbs.size = size; | |
1772 | INIT_LIST_HEAD(&dev->urbs.list); | |
1773 | ||
1774 | while (i < count) { | |
1775 | unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL); | |
1776 | if (!unode) | |
1777 | break; | |
1778 | unode->dev = dev; | |
1779 | ||
5bea1fbf BT |
1780 | INIT_DELAYED_WORK(&unode->release_urb_work, |
1781 | dlfb_release_urb_work); | |
1782 | ||
4a4854dd BT |
1783 | urb = usb_alloc_urb(0, GFP_KERNEL); |
1784 | if (!urb) { | |
1785 | kfree(unode); | |
1786 | break; | |
1787 | } | |
1788 | unode->urb = urb; | |
1789 | ||
c220cc3e GKH |
1790 | buf = usb_alloc_coherent(dev->udev, MAX_TRANSFER, GFP_KERNEL, |
1791 | &urb->transfer_dma); | |
4a4854dd BT |
1792 | if (!buf) { |
1793 | kfree(unode); | |
1794 | usb_free_urb(urb); | |
1795 | break; | |
1796 | } | |
1797 | ||
1798 | /* urb->transfer_buffer_length set to actual before submit */ | |
1799 | usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1), | |
1800 | buf, size, dlfb_urb_completion, unode); | |
1801 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
1802 | ||
1803 | list_add_tail(&unode->entry, &dev->urbs.list); | |
1804 | ||
1805 | i++; | |
1806 | } | |
1807 | ||
1808 | sema_init(&dev->urbs.limit_sem, i); | |
1809 | dev->urbs.count = i; | |
1810 | dev->urbs.available = i; | |
1811 | ||
b5a2104c | 1812 | dl_notice("allocated %d %d byte urbs\n", i, (int) size); |
4a4854dd BT |
1813 | |
1814 | return i; | |
1815 | } | |
1816 | ||
1817 | static struct urb *dlfb_get_urb(struct dlfb_data *dev) | |
1818 | { | |
1819 | int ret = 0; | |
1820 | struct list_head *entry; | |
1821 | struct urb_node *unode; | |
1822 | struct urb *urb = NULL; | |
1823 | unsigned long flags; | |
1824 | ||
1825 | /* Wait for an in-flight buffer to complete and get re-queued */ | |
1826 | ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT); | |
1827 | if (ret) { | |
1828 | atomic_set(&dev->lost_pixels, 1); | |
5bea1fbf BT |
1829 | dl_warn("wait for urb interrupted: %x available: %d\n", |
1830 | ret, dev->urbs.available); | |
4a4854dd BT |
1831 | goto error; |
1832 | } | |
1833 | ||
1834 | spin_lock_irqsave(&dev->urbs.lock, flags); | |
1835 | ||
1836 | BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */ | |
1837 | entry = dev->urbs.list.next; | |
1838 | list_del_init(entry); | |
1839 | dev->urbs.available--; | |
1840 | ||
1841 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1842 | ||
1843 | unode = list_entry(entry, struct urb_node, entry); | |
1844 | urb = unode->urb; | |
1845 | ||
1846 | error: | |
1847 | return urb; | |
1848 | } | |
1849 | ||
1850 | static int dlfb_submit_urb(struct dlfb_data *dev, struct urb *urb, size_t len) | |
1851 | { | |
1852 | int ret; | |
1853 | ||
1854 | BUG_ON(len > dev->urbs.size); | |
1855 | ||
1856 | urb->transfer_buffer_length = len; /* set to actual payload len */ | |
1857 | ret = usb_submit_urb(urb, GFP_KERNEL); | |
1858 | if (ret) { | |
1859 | dlfb_urb_completion(urb); /* because no one else will */ | |
1860 | atomic_set(&dev->lost_pixels, 1); | |
1861 | dl_err("usb_submit_urb error %x\n", ret); | |
1862 | } | |
1863 | return ret; | |
1864 | } | |
1865 | ||
d5ed5432 BT |
1866 | module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); |
1867 | MODULE_PARM_DESC(console, "Allow fbcon to consume first framebuffer found"); | |
1868 | ||
1869 | module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); | |
1870 | MODULE_PARM_DESC(fb_defio, "Enable fb_defio mmap support. *Experimental*"); | |
1871 | ||
59277b67 | 1872 | MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, " |
2469d5db BT |
1873 | "Jaya Kumar <jayakumar.lkml@gmail.com>, " |
1874 | "Bernie Thompson <bernie@plugable.com>"); | |
1875 | MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); | |
88e58b1a | 1876 | MODULE_LICENSE("GPL"); |
2469d5db | 1877 |