]>
Commit | Line | Data |
---|---|---|
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> |
88e58b1a RDI |
28 | |
29 | #include "udlfb.h" | |
30 | ||
59277b67 | 31 | static struct fb_fix_screeninfo dlfb_fix = { |
2469d5db | 32 | .id = "udlfb", |
1d31a9ee BT |
33 | .type = FB_TYPE_PACKED_PIXELS, |
34 | .visual = FB_VISUAL_TRUECOLOR, | |
35 | .xpanstep = 0, | |
36 | .ypanstep = 0, | |
37 | .ywrapstep = 0, | |
38 | .accel = FB_ACCEL_NONE, | |
59277b67 | 39 | }; |
88e58b1a | 40 | |
2469d5db BT |
41 | static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST | |
42 | #ifdef FBINFO_VIRTFB | |
43 | FBINFO_VIRTFB | | |
44 | #endif | |
45 | FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | | |
46 | FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; | |
47 | ||
cc403dc6 BT |
48 | /* |
49 | * There are many DisplayLink-based products, all with unique PIDs. We are able | |
50 | * to support all volume ones (circa 2009) with a single driver, so we match | |
51 | * globally on VID. TODO: Probe() needs to detect when we might be running | |
52 | * "future" chips, and bail on those, so a compatible driver can match. | |
53 | */ | |
54 | static struct usb_device_id id_table[] = { | |
55 | {.idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,}, | |
56 | {}, | |
57 | }; | |
58 | MODULE_DEVICE_TABLE(usb, id_table); | |
88e58b1a | 59 | |
dd8015f1 BT |
60 | #ifndef CONFIG_FB_DEFERRED_IO |
61 | #warning message "kernel FB_DEFFERRED_IO option to support generic fbdev apps" | |
62 | #endif | |
63 | ||
64 | #ifndef CONFIG_FB_SYS_IMAGEBLIT | |
65 | #ifndef CONFIG_FB_SYS_IMAGEBLIT_MODULE | |
66 | #warning message "FB_SYS_* in kernel or module option to support fb console" | |
67 | #endif | |
68 | #endif | |
69 | ||
70 | #ifndef CONFIG_FB_MODE_HELPERS | |
71 | #warning message "kernel FB_MODE_HELPERS required. Expect build break" | |
72 | #endif | |
73 | ||
4a4854dd BT |
74 | /* dlfb keeps a list of urbs for efficient bulk transfers */ |
75 | static void dlfb_urb_completion(struct urb *urb); | |
76 | static struct urb *dlfb_get_urb(struct dlfb_data *dev); | |
77 | static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len); | |
78 | static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size); | |
79 | static void dlfb_free_urb_list(struct dlfb_data *dev); | |
80 | ||
3e8f3d6f BT |
81 | /* other symbols with dependents */ |
82 | #ifdef CONFIG_FB_DEFERRED_IO | |
83 | static struct fb_deferred_io dlfb_defio; | |
84 | #endif | |
85 | ||
59277b67 | 86 | /* |
bd80816b BT |
87 | * All DisplayLink bulk operations start with 0xAF, followed by specific code |
88 | * All operations are written to buffers which then later get sent to device | |
59277b67 | 89 | */ |
4574203f | 90 | static char *dlfb_set_register(char *buf, u8 reg, u8 val) |
88e58b1a | 91 | { |
1d31a9ee BT |
92 | *buf++ = 0xAF; |
93 | *buf++ = 0x20; | |
94 | *buf++ = reg; | |
95 | *buf++ = val; | |
96 | return buf; | |
59277b67 | 97 | } |
88e58b1a | 98 | |
4574203f | 99 | static char *dlfb_vidreg_lock(char *buf) |
59277b67 | 100 | { |
4574203f | 101 | return dlfb_set_register(buf, 0xFF, 0x00); |
59277b67 | 102 | } |
88e58b1a | 103 | |
4574203f | 104 | static char *dlfb_vidreg_unlock(char *buf) |
59277b67 | 105 | { |
4574203f | 106 | return dlfb_set_register(buf, 0xFF, 0xFF); |
59277b67 BT |
107 | } |
108 | ||
109 | /* | |
530f43a8 | 110 | * On/Off for driving the DisplayLink framebuffer to the display |
59277b67 | 111 | */ |
530f43a8 | 112 | static char *dlfb_enable_hvsync(char *buf, bool enable) |
59277b67 | 113 | { |
530f43a8 BT |
114 | if (enable) |
115 | return dlfb_set_register(buf, 0x1F, 0x00); | |
116 | else | |
117 | return dlfb_set_register(buf, 0x1F, 0x01); | |
59277b67 BT |
118 | } |
119 | ||
4574203f | 120 | static char *dlfb_set_color_depth(char *buf, u8 selection) |
59277b67 | 121 | { |
4574203f | 122 | return dlfb_set_register(buf, 0x00, selection); |
59277b67 BT |
123 | } |
124 | ||
4574203f | 125 | static char *dlfb_set_base16bpp(char *wrptr, u32 base) |
59277b67 | 126 | { |
1d31a9ee | 127 | /* the base pointer is 16 bits wide, 0x20 is hi byte. */ |
4574203f BT |
128 | wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); |
129 | wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); | |
130 | return dlfb_set_register(wrptr, 0x22, base); | |
59277b67 BT |
131 | } |
132 | ||
bd80816b BT |
133 | /* |
134 | * DisplayLink HW has separate 16bpp and 8bpp framebuffers. | |
135 | * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer | |
136 | */ | |
4574203f | 137 | static char *dlfb_set_base8bpp(char *wrptr, u32 base) |
59277b67 | 138 | { |
4574203f BT |
139 | wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); |
140 | wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); | |
141 | return dlfb_set_register(wrptr, 0x28, base); | |
59277b67 BT |
142 | } |
143 | ||
4574203f | 144 | static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) |
59277b67 | 145 | { |
4574203f BT |
146 | wrptr = dlfb_set_register(wrptr, reg, value >> 8); |
147 | return dlfb_set_register(wrptr, reg+1, value); | |
59277b67 BT |
148 | } |
149 | ||
150 | /* | |
151 | * This is kind of weird because the controller takes some | |
152 | * register values in a different byte order than other registers. | |
153 | */ | |
4574203f | 154 | static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) |
59277b67 | 155 | { |
4574203f BT |
156 | wrptr = dlfb_set_register(wrptr, reg, value); |
157 | return dlfb_set_register(wrptr, reg+1, value >> 8); | |
59277b67 BT |
158 | } |
159 | ||
160 | /* | |
161 | * LFSR is linear feedback shift register. The reason we have this is | |
162 | * because the display controller needs to minimize the clock depth of | |
163 | * various counters used in the display path. So this code reverses the | |
164 | * provided value into the lfsr16 value by counting backwards to get | |
165 | * the value that needs to be set in the hardware comparator to get the | |
166 | * same actual count. This makes sense once you read above a couple of | |
167 | * times and think about it from a hardware perspective. | |
168 | */ | |
bd80816b | 169 | static u16 dlfb_lfsr16(u16 actual_count) |
59277b67 BT |
170 | { |
171 | u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ | |
172 | ||
173 | while (actual_count--) { | |
174 | lv = ((lv << 1) | | |
175 | (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) | |
176 | & 0xFFFF; | |
88e58b1a RDI |
177 | } |
178 | ||
59277b67 BT |
179 | return (u16) lv; |
180 | } | |
181 | ||
182 | /* | |
183 | * This does LFSR conversion on the value that is to be written. | |
184 | * See LFSR explanation above for more detail. | |
185 | */ | |
4574203f | 186 | static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) |
59277b67 | 187 | { |
bd80816b | 188 | return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); |
88e58b1a RDI |
189 | } |
190 | ||
59277b67 BT |
191 | /* |
192 | * This takes a standard fbdev screeninfo struct and all of its monitor mode | |
193 | * details and converts them into the DisplayLink equivalent register commands. | |
194 | */ | |
4574203f | 195 | static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) |
88e58b1a | 196 | { |
59277b67 BT |
197 | u16 xds, yds; |
198 | u16 xde, yde; | |
199 | u16 yec; | |
200 | ||
59277b67 BT |
201 | /* x display start */ |
202 | xds = var->left_margin + var->hsync_len; | |
4574203f | 203 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); |
59277b67 BT |
204 | /* x display end */ |
205 | xde = xds + var->xres; | |
4574203f | 206 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); |
59277b67 BT |
207 | |
208 | /* y display start */ | |
209 | yds = var->upper_margin + var->vsync_len; | |
4574203f | 210 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); |
59277b67 BT |
211 | /* y display end */ |
212 | yde = yds + var->yres; | |
4574203f | 213 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); |
59277b67 BT |
214 | |
215 | /* x end count is active + blanking - 1 */ | |
4574203f BT |
216 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, |
217 | xde + var->right_margin - 1); | |
59277b67 BT |
218 | |
219 | /* libdlo hardcodes hsync start to 1 */ | |
4574203f | 220 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); |
59277b67 BT |
221 | |
222 | /* hsync end is width of sync pulse + 1 */ | |
4574203f | 223 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); |
59277b67 BT |
224 | |
225 | /* hpixels is active pixels */ | |
4574203f | 226 | wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); |
88e58b1a | 227 | |
59277b67 BT |
228 | /* yendcount is vertical active + vertical blanking */ |
229 | yec = var->yres + var->upper_margin + var->lower_margin + | |
230 | var->vsync_len; | |
4574203f | 231 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); |
88e58b1a | 232 | |
59277b67 | 233 | /* libdlo hardcodes vsync start to 0 */ |
4574203f | 234 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); |
59277b67 BT |
235 | |
236 | /* vsync end is width of vsync pulse */ | |
4574203f | 237 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); |
59277b67 BT |
238 | |
239 | /* vpixels is active pixels */ | |
4574203f | 240 | wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); |
59277b67 BT |
241 | |
242 | /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ | |
4574203f BT |
243 | wrptr = dlfb_set_register_16be(wrptr, 0x1B, |
244 | 200*1000*1000/var->pixclock); | |
59277b67 BT |
245 | |
246 | return wrptr; | |
247 | } | |
248 | ||
249 | /* | |
250 | * This takes a standard fbdev screeninfo struct that was fetched or prepared | |
251 | * and then generates the appropriate command sequence that then drives the | |
252 | * display controller. | |
253 | */ | |
254 | static int dlfb_set_video_mode(struct dlfb_data *dev, | |
255 | struct fb_var_screeninfo *var) | |
256 | { | |
257 | char *buf; | |
258 | char *wrptr; | |
259 | int retval = 0; | |
260 | int writesize; | |
530f43a8 BT |
261 | struct urb *urb; |
262 | ||
263 | if (!atomic_read(&dev->usb_active)) | |
264 | return -EPERM; | |
59277b67 | 265 | |
530f43a8 BT |
266 | urb = dlfb_get_urb(dev); |
267 | if (!urb) | |
268 | return -ENOMEM; | |
269 | buf = (char *) urb->transfer_buffer; | |
59277b67 BT |
270 | |
271 | /* | |
272 | * This first section has to do with setting the base address on the | |
273 | * controller * associated with the display. There are 2 base | |
274 | * pointers, currently, we only * use the 16 bpp segment. | |
275 | */ | |
4574203f BT |
276 | wrptr = dlfb_vidreg_lock(buf); |
277 | wrptr = dlfb_set_color_depth(wrptr, 0x00); | |
59277b67 | 278 | /* set base for 16bpp segment to 0 */ |
4574203f | 279 | wrptr = dlfb_set_base16bpp(wrptr, 0); |
59277b67 | 280 | /* set base for 8bpp segment to end of fb */ |
4574203f | 281 | wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len); |
59277b67 | 282 | |
4574203f | 283 | wrptr = dlfb_set_vid_cmds(wrptr, var); |
530f43a8 | 284 | wrptr = dlfb_enable_hvsync(wrptr, true); |
4574203f | 285 | wrptr = dlfb_vidreg_unlock(wrptr); |
59277b67 BT |
286 | |
287 | writesize = wrptr - buf; | |
288 | ||
530f43a8 | 289 | retval = dlfb_submit_urb(dev, urb, writesize); |
59277b67 | 290 | |
59277b67 BT |
291 | return retval; |
292 | } | |
293 | ||
4574203f | 294 | static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) |
88e58b1a RDI |
295 | { |
296 | unsigned long start = vma->vm_start; | |
297 | unsigned long size = vma->vm_end - vma->vm_start; | |
298 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
299 | unsigned long page, pos; | |
bd80816b | 300 | struct dlfb_data *dev = info->par; |
88e58b1a | 301 | |
bd80816b | 302 | dl_notice("MMAP: %lu %u\n", offset + size, info->fix.smem_len); |
88e58b1a | 303 | |
f05e0575 | 304 | if (offset + size > info->fix.smem_len) |
88e58b1a | 305 | return -EINVAL; |
88e58b1a RDI |
306 | |
307 | pos = (unsigned long)info->fix.smem_start + offset; | |
308 | ||
309 | while (size > 0) { | |
310 | page = vmalloc_to_pfn((void *)pos); | |
f05e0575 | 311 | if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) |
88e58b1a | 312 | return -EAGAIN; |
f05e0575 | 313 | |
88e58b1a RDI |
314 | start += PAGE_SIZE; |
315 | pos += PAGE_SIZE; | |
316 | if (size > PAGE_SIZE) | |
317 | size -= PAGE_SIZE; | |
318 | else | |
319 | size = 0; | |
320 | } | |
321 | ||
322 | vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */ | |
323 | return 0; | |
324 | ||
325 | } | |
326 | ||
530f43a8 BT |
327 | /* |
328 | * Trims identical data from front and back of line | |
329 | * Sets new front buffer address and width | |
330 | * And returns byte count of identical pixels | |
331 | * Assumes CPU natural alignment (unsigned long) | |
332 | * for back and front buffer ptrs and width | |
333 | */ | |
334 | static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) | |
7316bc55 | 335 | { |
530f43a8 BT |
336 | int j, k; |
337 | const unsigned long *back = (const unsigned long *) bback; | |
338 | const unsigned long *front = (const unsigned long *) *bfront; | |
339 | const int width = *width_bytes / sizeof(unsigned long); | |
340 | int identical = width; | |
341 | int start = width; | |
342 | int end = width; | |
343 | ||
344 | prefetch((void *) front); | |
345 | prefetch((void *) back); | |
346 | ||
347 | for (j = 0; j < width; j++) { | |
348 | if (back[j] != front[j]) { | |
349 | start = j; | |
350 | break; | |
351 | } | |
352 | } | |
7316bc55 | 353 | |
530f43a8 BT |
354 | for (k = width - 1; k > j; k--) { |
355 | if (back[k] != front[k]) { | |
356 | end = k+1; | |
357 | break; | |
358 | } | |
7316bc55 RDI |
359 | } |
360 | ||
530f43a8 BT |
361 | identical = start + (width - end); |
362 | *bfront = (u8 *) &front[start]; | |
363 | *width_bytes = (end - start) * sizeof(unsigned long); | |
364 | ||
365 | return identical * sizeof(unsigned long); | |
7316bc55 RDI |
366 | } |
367 | ||
368 | /* | |
530f43a8 BT |
369 | Render a command stream for an encoded horizontal line segment of pixels. |
370 | ||
371 | A command buffer holds several commands. | |
372 | It always begins with a fresh command header | |
373 | (the protocol doesn't require this, but we enforce it to allow | |
374 | multiple buffers to be potentially encoded and sent in parallel). | |
375 | A single command encodes one contiguous horizontal line of pixels | |
376 | ||
377 | The function relies on the client to do all allocation, so that | |
378 | rendering can be done directly to output buffers (e.g. USB URBs). | |
379 | The function fills the supplied command buffer, providing information | |
380 | on where it left off, so the client may call in again with additional | |
381 | buffers if the line will take several buffers to complete. | |
382 | ||
383 | A single command can transmit a maximum of 256 pixels, | |
384 | regardless of the compression ratio (protocol design limit). | |
385 | To the hardware, 0 for a size byte means 256 | |
386 | ||
387 | Rather than 256 pixel commands which are either rl or raw encoded, | |
388 | the rlx command simply assumes alternating raw and rl spans within one cmd. | |
389 | This has a slightly larger header overhead, but produces more even results. | |
390 | It also processes all data (read and write) in a single pass. | |
391 | Performance benchmarks of common cases show it having just slightly better | |
392 | compression than 256 pixel raw -or- rle commands, with similar CPU consumpion. | |
393 | But for very rl friendly data, will compress not quite as well. | |
7316bc55 | 394 | */ |
530f43a8 BT |
395 | static void dlfb_compress_hline( |
396 | const uint16_t **pixel_start_ptr, | |
397 | const uint16_t *const pixel_end, | |
398 | uint32_t *device_address_ptr, | |
399 | uint8_t **command_buffer_ptr, | |
400 | const uint8_t *const cmd_buffer_end) | |
88e58b1a | 401 | { |
530f43a8 BT |
402 | const uint16_t *pixel = *pixel_start_ptr; |
403 | uint32_t dev_addr = *device_address_ptr; | |
404 | uint8_t *cmd = *command_buffer_ptr; | |
405 | const int bpp = 2; | |
406 | ||
407 | while ((pixel_end > pixel) && | |
408 | (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { | |
409 | uint8_t *raw_pixels_count_byte = 0; | |
410 | uint8_t *cmd_pixels_count_byte = 0; | |
411 | const uint16_t *raw_pixel_start = 0; | |
412 | const uint16_t *cmd_pixel_start, *cmd_pixel_end = 0; | |
413 | const uint32_t be_dev_addr = cpu_to_be32(dev_addr); | |
414 | ||
415 | prefetchw((void *) cmd); /* pull in one cache line at least */ | |
416 | ||
417 | *cmd++ = 0xAF; | |
418 | *cmd++ = 0x6B; | |
419 | *cmd++ = (uint8_t) ((be_dev_addr >> 8) & 0xFF); | |
420 | *cmd++ = (uint8_t) ((be_dev_addr >> 16) & 0xFF); | |
421 | *cmd++ = (uint8_t) ((be_dev_addr >> 24) & 0xFF); | |
422 | ||
423 | cmd_pixels_count_byte = cmd++; /* we'll know this later */ | |
424 | cmd_pixel_start = pixel; | |
425 | ||
426 | raw_pixels_count_byte = cmd++; /* we'll know this later */ | |
427 | raw_pixel_start = pixel; | |
428 | ||
429 | cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1, | |
430 | min((int)(pixel_end - pixel), | |
431 | (int)(cmd_buffer_end - cmd) / bpp)); | |
432 | ||
433 | prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp); | |
434 | ||
435 | while (pixel < cmd_pixel_end) { | |
436 | const uint16_t * const repeating_pixel = pixel; | |
437 | ||
438 | *(uint16_t *)cmd = cpu_to_be16p(pixel); | |
439 | cmd += 2; | |
440 | pixel++; | |
441 | ||
442 | if (unlikely((pixel < cmd_pixel_end) && | |
443 | (*pixel == *repeating_pixel))) { | |
444 | /* go back and fill in raw pixel count */ | |
445 | *raw_pixels_count_byte = ((repeating_pixel - | |
446 | raw_pixel_start) + 1) & 0xFF; | |
447 | ||
448 | while ((pixel < cmd_pixel_end) | |
449 | && (*pixel == *repeating_pixel)) { | |
450 | pixel++; | |
88e58b1a | 451 | } |
59277b67 | 452 | |
530f43a8 BT |
453 | /* immediately after raw data is repeat byte */ |
454 | *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF; | |
59277b67 | 455 | |
530f43a8 BT |
456 | /* Then start another raw pixel span */ |
457 | raw_pixel_start = pixel; | |
458 | raw_pixels_count_byte = cmd++; | |
7316bc55 | 459 | } |
88e58b1a RDI |
460 | } |
461 | ||
530f43a8 BT |
462 | if (pixel > raw_pixel_start) { |
463 | /* finalize last RAW span */ | |
464 | *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF; | |
465 | } | |
88e58b1a | 466 | |
530f43a8 BT |
467 | *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; |
468 | dev_addr += (pixel - cmd_pixel_start) * bpp; | |
88e58b1a RDI |
469 | } |
470 | ||
530f43a8 BT |
471 | if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) { |
472 | /* Fill leftover bytes with no-ops */ | |
473 | if (cmd_buffer_end > cmd) | |
474 | memset(cmd, 0xAF, cmd_buffer_end - cmd); | |
475 | cmd = (uint8_t *) cmd_buffer_end; | |
7316bc55 | 476 | } |
88e58b1a | 477 | |
530f43a8 BT |
478 | *command_buffer_ptr = cmd; |
479 | *pixel_start_ptr = pixel; | |
480 | *device_address_ptr = dev_addr; | |
88e58b1a | 481 | |
530f43a8 | 482 | return; |
88e58b1a RDI |
483 | } |
484 | ||
530f43a8 BT |
485 | /* |
486 | * There are 3 copies of every pixel: The front buffer that the fbdev | |
487 | * client renders to, the actual framebuffer across the USB bus in hardware | |
488 | * (that we can only write to, slowly, and can never read), and (optionally) | |
489 | * our shadow copy that tracks what's been sent to that hardware buffer. | |
490 | */ | |
491 | static void dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr, | |
492 | const char *front, char **urb_buf_ptr, | |
493 | u32 byte_offset, u32 byte_width, | |
494 | int *ident_ptr, int *sent_ptr) | |
88e58b1a | 495 | { |
530f43a8 BT |
496 | const u8 *line_start, *line_end, *next_pixel; |
497 | u32 dev_addr = dev->base16 + byte_offset; | |
498 | struct urb *urb = *urb_ptr; | |
499 | u8 *cmd = *urb_buf_ptr; | |
500 | u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; | |
501 | ||
502 | line_start = (u8 *) (front + byte_offset); | |
503 | next_pixel = line_start; | |
504 | line_end = next_pixel + byte_width; | |
505 | ||
506 | if (dev->backing_buffer) { | |
507 | int offset; | |
508 | const u8 *back_start = (u8 *) (dev->backing_buffer | |
509 | + byte_offset); | |
510 | ||
511 | *ident_ptr += dlfb_trim_hline(back_start, &next_pixel, | |
512 | &byte_width); | |
513 | ||
514 | offset = next_pixel - line_start; | |
515 | line_end = next_pixel + byte_width; | |
516 | dev_addr += offset; | |
517 | back_start += offset; | |
518 | line_start += offset; | |
519 | ||
520 | memcpy((char *)back_start, (char *) line_start, | |
521 | byte_width); | |
522 | } | |
88e58b1a | 523 | |
530f43a8 BT |
524 | while (next_pixel < line_end) { |
525 | ||
526 | dlfb_compress_hline((const uint16_t **) &next_pixel, | |
527 | (const uint16_t *) line_end, &dev_addr, | |
528 | (u8 **) &cmd, (u8 *) cmd_end); | |
529 | ||
530 | if (cmd >= cmd_end) { | |
531 | int len = cmd - (u8 *) urb->transfer_buffer; | |
532 | if (dlfb_submit_urb(dev, urb, len)) | |
533 | return; /* lost pixels is set */ | |
534 | *sent_ptr += len; | |
535 | urb = dlfb_get_urb(dev); | |
536 | if (!urb) | |
537 | return; /* lost_pixels is set */ | |
538 | *urb_ptr = urb; | |
539 | cmd = urb->transfer_buffer; | |
540 | cmd_end = &cmd[urb->transfer_buffer_length]; | |
88e58b1a | 541 | } |
88e58b1a RDI |
542 | } |
543 | ||
530f43a8 | 544 | *urb_buf_ptr = cmd; |
88e58b1a RDI |
545 | } |
546 | ||
530f43a8 BT |
547 | int dlfb_handle_damage(struct dlfb_data *dev, int x, int y, |
548 | int width, int height, char *data) | |
7316bc55 | 549 | { |
7316bc55 | 550 | int i, ret; |
530f43a8 BT |
551 | char *cmd; |
552 | cycles_t start_cycles, end_cycles; | |
553 | int bytes_sent = 0; | |
554 | int bytes_identical = 0; | |
555 | struct urb *urb; | |
556 | int aligned_x; | |
557 | ||
558 | start_cycles = get_cycles(); | |
559 | ||
560 | aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long)); | |
561 | width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long)); | |
562 | x = aligned_x; | |
563 | ||
564 | if ((width <= 0) || | |
565 | (x + width > dev->info->var.xres) || | |
566 | (y + height > dev->info->var.yres)) | |
567 | return -EINVAL; | |
7316bc55 | 568 | |
530f43a8 BT |
569 | if (!atomic_read(&dev->usb_active)) |
570 | return 0; | |
7316bc55 | 571 | |
530f43a8 BT |
572 | urb = dlfb_get_urb(dev); |
573 | if (!urb) | |
574 | return 0; | |
575 | cmd = urb->transfer_buffer; | |
7316bc55 | 576 | |
530f43a8 BT |
577 | for (i = y; i < y + height ; i++) { |
578 | const int line_offset = dev->info->fix.line_length * i; | |
579 | const int byte_offset = line_offset + (x * BPP); | |
7316bc55 | 580 | |
530f43a8 BT |
581 | dlfb_render_hline(dev, &urb, (char *) dev->info->fix.smem_start, |
582 | &cmd, byte_offset, width * BPP, | |
583 | &bytes_identical, &bytes_sent); | |
7316bc55 RDI |
584 | } |
585 | ||
530f43a8 BT |
586 | if (cmd > (char *) urb->transfer_buffer) { |
587 | /* Send partial buffer remaining before exiting */ | |
588 | int len = cmd - (char *) urb->transfer_buffer; | |
589 | ret = dlfb_submit_urb(dev, urb, len); | |
590 | bytes_sent += len; | |
591 | } else | |
592 | dlfb_urb_completion(urb); | |
593 | ||
594 | atomic_add(bytes_sent, &dev->bytes_sent); | |
595 | atomic_add(bytes_identical, &dev->bytes_identical); | |
596 | atomic_add(width*height*2, &dev->bytes_rendered); | |
597 | end_cycles = get_cycles(); | |
598 | atomic_add(((unsigned int) ((end_cycles - start_cycles) | |
599 | >> 10)), /* Kcycles */ | |
600 | &dev->cpu_kcycles_used); | |
7316bc55 | 601 | |
530f43a8 | 602 | return 0; |
7316bc55 RDI |
603 | } |
604 | ||
530f43a8 BT |
605 | /* hardware has native COPY command (see libdlo), but not worth it for fbcon */ |
606 | static void dlfb_ops_copyarea(struct fb_info *info, | |
607 | const struct fb_copyarea *area) | |
88e58b1a | 608 | { |
88e58b1a | 609 | |
530f43a8 | 610 | struct dlfb_data *dev = info->par; |
88e58b1a | 611 | |
530f43a8 | 612 | #if defined CONFIG_FB_SYS_COPYAREA || defined CONFIG_FB_SYS_COPYAREA_MODULE |
88e58b1a | 613 | |
530f43a8 | 614 | sys_copyarea(info, area); |
88e58b1a | 615 | |
530f43a8 BT |
616 | dlfb_handle_damage(dev, area->dx, area->dy, |
617 | area->width, area->height, info->screen_base); | |
618 | #endif | |
619 | atomic_inc(&dev->copy_count); | |
88e58b1a | 620 | |
530f43a8 | 621 | } |
88e58b1a | 622 | |
530f43a8 BT |
623 | static void dlfb_ops_imageblit(struct fb_info *info, |
624 | const struct fb_image *image) | |
625 | { | |
626 | struct dlfb_data *dev = info->par; | |
88e58b1a | 627 | |
530f43a8 | 628 | #if defined CONFIG_FB_SYS_IMAGEBLIT || defined CONFIG_FB_SYS_IMAGEBLIT_MODULE |
88e58b1a | 629 | |
530f43a8 | 630 | sys_imageblit(info, image); |
88e58b1a | 631 | |
530f43a8 BT |
632 | dlfb_handle_damage(dev, image->dx, image->dy, |
633 | image->width, image->height, info->screen_base); | |
88e58b1a | 634 | |
530f43a8 | 635 | #endif |
88e58b1a | 636 | |
530f43a8 | 637 | atomic_inc(&dev->blit_count); |
88e58b1a RDI |
638 | } |
639 | ||
530f43a8 BT |
640 | static void dlfb_ops_fillrect(struct fb_info *info, |
641 | const struct fb_fillrect *rect) | |
88e58b1a | 642 | { |
88e58b1a RDI |
643 | struct dlfb_data *dev = info->par; |
644 | ||
530f43a8 | 645 | #if defined CONFIG_FB_SYS_FILLRECT || defined CONFIG_FB_SYS_FILLRECT_MODULE |
88e58b1a | 646 | |
530f43a8 | 647 | sys_fillrect(info, rect); |
88e58b1a | 648 | |
530f43a8 BT |
649 | dlfb_handle_damage(dev, rect->dx, rect->dy, rect->width, |
650 | rect->height, info->screen_base); | |
651 | #endif | |
88e58b1a | 652 | |
530f43a8 | 653 | atomic_inc(&dev->fill_count); |
88e58b1a RDI |
654 | |
655 | } | |
656 | ||
7d9485e2 BT |
657 | static void dlfb_get_edid(struct dlfb_data *dev) |
658 | { | |
659 | int i; | |
660 | int ret; | |
661 | char rbuf[2]; | |
662 | ||
663 | for (i = 0; i < sizeof(dev->edid); i++) { | |
664 | ret = usb_control_msg(dev->udev, | |
665 | usb_rcvctrlpipe(dev->udev, 0), (0x02), | |
666 | (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2, | |
667 | 0); | |
668 | dev->edid[i] = rbuf[1]; | |
669 | } | |
670 | } | |
671 | ||
4574203f | 672 | static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd, |
530f43a8 | 673 | unsigned long arg) |
88e58b1a | 674 | { |
530f43a8 BT |
675 | |
676 | struct dlfb_data *dev = info->par; | |
7316bc55 | 677 | struct dloarea *area = NULL; |
88e58b1a | 678 | |
530f43a8 BT |
679 | if (!atomic_read(&dev->usb_active)) |
680 | return 0; | |
681 | ||
682 | /* TODO: Update X server to get this from sysfs instead */ | |
683 | if (cmd == DLFB_IOCTL_RETURN_EDID) { | |
7316bc55 | 684 | char *edid = (char *)arg; |
530f43a8 BT |
685 | dlfb_get_edid(dev); |
686 | if (copy_to_user(edid, dev->edid, sizeof(dev->edid))) | |
7316bc55 | 687 | return -EFAULT; |
7316bc55 RDI |
688 | return 0; |
689 | } | |
690 | ||
530f43a8 BT |
691 | /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ |
692 | if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { | |
88e58b1a RDI |
693 | |
694 | area = (struct dloarea *)arg; | |
695 | ||
696 | if (area->x < 0) | |
697 | area->x = 0; | |
698 | ||
699 | if (area->x > info->var.xres) | |
700 | area->x = info->var.xres; | |
701 | ||
702 | if (area->y < 0) | |
703 | area->y = 0; | |
704 | ||
705 | if (area->y > info->var.yres) | |
706 | area->y = info->var.yres; | |
707 | ||
530f43a8 BT |
708 | atomic_set(&dev->use_defio, 0); |
709 | ||
710 | dlfb_handle_damage(dev, area->x, area->y, area->w, area->h, | |
88e58b1a | 711 | info->screen_base); |
530f43a8 | 712 | atomic_inc(&dev->damage_count); |
88e58b1a | 713 | } |
7316bc55 | 714 | |
88e58b1a RDI |
715 | return 0; |
716 | } | |
717 | ||
f05e0575 | 718 | /* taken from vesafb */ |
88e58b1a | 719 | static int |
4574203f | 720 | dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green, |
88e58b1a RDI |
721 | unsigned blue, unsigned transp, struct fb_info *info) |
722 | { | |
723 | int err = 0; | |
724 | ||
725 | if (regno >= info->cmap.len) | |
726 | return 1; | |
727 | ||
728 | if (regno < 16) { | |
729 | if (info->var.red.offset == 10) { | |
730 | /* 1:5:5:5 */ | |
731 | ((u32 *) (info->pseudo_palette))[regno] = | |
732 | ((red & 0xf800) >> 1) | | |
733 | ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); | |
734 | } else { | |
735 | /* 0:5:6:5 */ | |
736 | ((u32 *) (info->pseudo_palette))[regno] = | |
737 | ((red & 0xf800)) | | |
738 | ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); | |
739 | } | |
740 | } | |
741 | ||
742 | return err; | |
743 | } | |
744 | ||
3e8f3d6f BT |
745 | /* |
746 | * It's common for several clients to have framebuffer open simultaneously. | |
747 | * e.g. both fbcon and X. Makes things interesting. | |
748 | */ | |
749 | static int dlfb_ops_open(struct fb_info *info, int user) | |
750 | { | |
751 | struct dlfb_data *dev = info->par; | |
752 | ||
753 | /* if (user == 0) | |
754 | * We could special case kernel mode clients (fbcon) here | |
755 | */ | |
756 | ||
757 | mutex_lock(&dev->fb_open_lock); | |
758 | ||
759 | dev->fb_count++; | |
760 | ||
761 | #ifdef CONFIG_FB_DEFERRED_IO | |
762 | if ((atomic_read(&dev->use_defio)) && (info->fbdefio == NULL)) { | |
763 | /* enable defio */ | |
764 | info->fbdefio = &dlfb_defio; | |
765 | fb_deferred_io_init(info); | |
766 | } | |
767 | #endif | |
768 | ||
769 | dl_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n", | |
770 | info->node, user, info, dev->fb_count); | |
771 | ||
772 | mutex_unlock(&dev->fb_open_lock); | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
4574203f | 777 | static int dlfb_ops_release(struct fb_info *info, int user) |
88e58b1a | 778 | { |
3e8f3d6f BT |
779 | struct dlfb_data *dev = info->par; |
780 | ||
781 | mutex_lock(&dev->fb_open_lock); | |
782 | ||
783 | dev->fb_count--; | |
784 | ||
785 | #ifdef CONFIG_FB_DEFERRED_IO | |
786 | if ((dev->fb_count == 0) && (info->fbdefio)) { | |
787 | fb_deferred_io_cleanup(info); | |
788 | info->fbdefio = NULL; | |
789 | info->fbops->fb_mmap = dlfb_ops_mmap; | |
790 | } | |
791 | #endif | |
792 | ||
793 | dl_notice("release /dev/fb%d user=%d count=%d\n", | |
794 | info->node, user, dev->fb_count); | |
795 | ||
796 | mutex_unlock(&dev->fb_open_lock); | |
797 | ||
88e58b1a RDI |
798 | return 0; |
799 | } | |
800 | ||
4a4854dd BT |
801 | /* |
802 | * Called when all client interfaces to start transactions have been disabled, | |
803 | * and all references to our device instance (dlfb_data) are released. | |
804 | * Every transaction must have a reference, so we know are fully spun down | |
805 | */ | |
806 | static void dlfb_delete(struct kref *kref) | |
807 | { | |
808 | struct dlfb_data *dev = container_of(kref, struct dlfb_data, kref); | |
809 | ||
810 | if (dev->backing_buffer) | |
811 | vfree(dev->backing_buffer); | |
812 | ||
3e8f3d6f BT |
813 | mutex_destroy(&dev->fb_open_lock); |
814 | ||
4a4854dd BT |
815 | kfree(dev); |
816 | } | |
817 | ||
2469d5db BT |
818 | /* |
819 | * Called by fbdev as last part of unregister_framebuffer() process | |
820 | * No new clients can open connections. Deallocate everything fb_info. | |
821 | */ | |
822 | static void dlfb_ops_destroy(struct fb_info *info) | |
823 | { | |
824 | struct dlfb_data *dev = info->par; | |
825 | ||
826 | if (info->cmap.len != 0) | |
827 | fb_dealloc_cmap(&info->cmap); | |
828 | if (info->monspecs.modedb) | |
829 | fb_destroy_modedb(info->monspecs.modedb); | |
830 | if (info->screen_base) | |
831 | vfree(info->screen_base); | |
832 | ||
833 | fb_destroy_modelist(&info->modelist); | |
834 | ||
835 | framebuffer_release(info); | |
836 | ||
837 | /* ref taken before register_framebuffer() for dlfb_data clients */ | |
838 | kref_put(&dev->kref, dlfb_delete); | |
839 | } | |
840 | ||
7d9485e2 BT |
841 | /* |
842 | * Check whether a video mode is supported by the DisplayLink chip | |
843 | * We start from monitor's modes, so don't need to filter that here | |
844 | */ | |
845 | static int dlfb_is_valid_mode(struct fb_videomode *mode, | |
846 | struct fb_info *info) | |
847 | { | |
848 | struct dlfb_data *dev = info->par; | |
849 | ||
850 | if (mode->xres * mode->yres > dev->sku_pixel_limit) | |
851 | return 0; | |
852 | ||
853 | return 1; | |
854 | } | |
855 | ||
856 | static void dlfb_var_color_format(struct fb_var_screeninfo *var) | |
857 | { | |
858 | const struct fb_bitfield red = { 11, 5, 0 }; | |
859 | const struct fb_bitfield green = { 5, 6, 0 }; | |
860 | const struct fb_bitfield blue = { 0, 5, 0 }; | |
861 | ||
862 | var->bits_per_pixel = 16; | |
863 | var->red = red; | |
864 | var->green = green; | |
865 | var->blue = blue; | |
866 | } | |
867 | ||
2469d5db BT |
868 | static int dlfb_ops_check_var(struct fb_var_screeninfo *var, |
869 | struct fb_info *info) | |
870 | { | |
871 | struct fb_videomode mode; | |
872 | ||
873 | /* TODO: support dynamically changing framebuffer size */ | |
874 | if ((var->xres * var->yres * 2) > info->fix.smem_len) | |
875 | return -EINVAL; | |
876 | ||
877 | /* set device-specific elements of var unrelated to mode */ | |
878 | dlfb_var_color_format(var); | |
879 | ||
880 | fb_var_to_videomode(&mode, var); | |
881 | ||
882 | if (!dlfb_is_valid_mode(&mode, info)) | |
883 | return -EINVAL; | |
884 | ||
885 | return 0; | |
886 | } | |
887 | ||
888 | static int dlfb_ops_set_par(struct fb_info *info) | |
889 | { | |
890 | struct dlfb_data *dev = info->par; | |
891 | ||
892 | dl_notice("set_par mode %dx%d\n", info->var.xres, info->var.yres); | |
893 | ||
894 | return dlfb_set_video_mode(dev, &info->var); | |
895 | } | |
896 | ||
4574203f | 897 | static int dlfb_ops_blank(int blank_mode, struct fb_info *info) |
f05e0575 | 898 | { |
530f43a8 BT |
899 | struct dlfb_data *dev = info->par; |
900 | char *bufptr; | |
901 | struct urb *urb; | |
7316bc55 | 902 | |
530f43a8 BT |
903 | urb = dlfb_get_urb(dev); |
904 | if (!urb) | |
905 | return 0; | |
906 | bufptr = (char *) urb->transfer_buffer; | |
907 | ||
908 | /* overloading usb_active. UNBLANK can conflict with teardown */ | |
909 | ||
910 | bufptr = dlfb_vidreg_lock(bufptr); | |
7316bc55 | 911 | if (blank_mode != FB_BLANK_UNBLANK) { |
530f43a8 BT |
912 | atomic_set(&dev->usb_active, 0); |
913 | bufptr = dlfb_enable_hvsync(bufptr, false); | |
7316bc55 | 914 | } else { |
530f43a8 BT |
915 | atomic_set(&dev->usb_active, 1); |
916 | bufptr = dlfb_enable_hvsync(bufptr, true); | |
7316bc55 | 917 | } |
530f43a8 | 918 | bufptr = dlfb_vidreg_unlock(bufptr); |
7316bc55 | 919 | |
530f43a8 | 920 | dlfb_submit_urb(dev, urb, bufptr - (char *) urb->transfer_buffer); |
7316bc55 | 921 | |
88e58b1a RDI |
922 | return 0; |
923 | } | |
924 | ||
925 | static struct fb_ops dlfb_ops = { | |
2469d5db | 926 | .owner = THIS_MODULE, |
4574203f BT |
927 | .fb_setcolreg = dlfb_ops_setcolreg, |
928 | .fb_fillrect = dlfb_ops_fillrect, | |
929 | .fb_copyarea = dlfb_ops_copyarea, | |
930 | .fb_imageblit = dlfb_ops_imageblit, | |
931 | .fb_mmap = dlfb_ops_mmap, | |
932 | .fb_ioctl = dlfb_ops_ioctl, | |
3e8f3d6f | 933 | .fb_open = dlfb_ops_open, |
4574203f BT |
934 | .fb_release = dlfb_ops_release, |
935 | .fb_blank = dlfb_ops_blank, | |
2469d5db BT |
936 | .fb_check_var = dlfb_ops_check_var, |
937 | .fb_set_par = dlfb_ops_set_par, | |
88e58b1a RDI |
938 | }; |
939 | ||
7d9485e2 BT |
940 | /* |
941 | * Calls dlfb_get_edid() to query the EDID of attached monitor via usb cmds | |
942 | * Then parses EDID into three places used by various parts of fbdev: | |
943 | * fb_var_screeninfo contains the timing of the monitor's preferred mode | |
944 | * fb_info.monspecs is full parsed EDID info, including monspecs.modedb | |
945 | * fb_info.modelist is a linked list of all monitor & VESA modes which work | |
946 | * | |
947 | * If EDID is not readable/valid, then modelist is all VESA modes, | |
948 | * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode | |
949 | * Returns 0 if EDID parses successfully | |
950 | */ | |
951 | static int dlfb_parse_edid(struct dlfb_data *dev, | |
952 | struct fb_var_screeninfo *var, | |
953 | struct fb_info *info) | |
954 | { | |
955 | int i; | |
956 | const struct fb_videomode *default_vmode = NULL; | |
957 | int result = 0; | |
958 | ||
959 | fb_destroy_modelist(&info->modelist); | |
960 | memset(&info->monspecs, 0, sizeof(info->monspecs)); | |
961 | ||
962 | dlfb_get_edid(dev); | |
963 | fb_edid_to_monspecs(dev->edid, &info->monspecs); | |
964 | ||
965 | if (info->monspecs.modedb_len > 0) { | |
966 | ||
967 | for (i = 0; i < info->monspecs.modedb_len; i++) { | |
968 | if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info)) | |
969 | fb_add_videomode(&info->monspecs.modedb[i], | |
970 | &info->modelist); | |
971 | } | |
972 | ||
973 | default_vmode = fb_find_best_display(&info->monspecs, | |
974 | &info->modelist); | |
975 | } else { | |
976 | struct fb_videomode fb_vmode = {0}; | |
977 | ||
978 | dl_err("Unable to get valid EDID from device/display\n"); | |
979 | result = 1; | |
980 | ||
981 | /* | |
982 | * Add the standard VESA modes to our modelist | |
983 | * Since we don't have EDID, there may be modes that | |
984 | * overspec monitor and/or are incorrect aspect ratio, etc. | |
985 | * But at least the user has a chance to choose | |
986 | */ | |
987 | for (i = 0; i < VESA_MODEDB_SIZE; i++) { | |
988 | if (dlfb_is_valid_mode((struct fb_videomode *) | |
989 | &vesa_modes[i], info)) | |
990 | fb_add_videomode(&vesa_modes[i], | |
991 | &info->modelist); | |
992 | } | |
993 | ||
994 | /* | |
995 | * default to resolution safe for projectors | |
996 | * (since they are most common case without EDID) | |
997 | */ | |
998 | fb_vmode.xres = 800; | |
999 | fb_vmode.yres = 600; | |
1000 | fb_vmode.refresh = 60; | |
1001 | default_vmode = fb_find_nearest_mode(&fb_vmode, | |
1002 | &info->modelist); | |
1003 | } | |
1004 | ||
1005 | fb_videomode_to_var(var, default_vmode); | |
1006 | dlfb_var_color_format(var); | |
1007 | ||
1008 | return result; | |
1009 | } | |
1010 | ||
1011 | static ssize_t metrics_bytes_rendered_show(struct device *fbdev, | |
1012 | struct device_attribute *a, char *buf) { | |
1013 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1014 | struct dlfb_data *dev = fb_info->par; | |
1015 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1016 | atomic_read(&dev->bytes_rendered)); | |
1017 | } | |
1018 | ||
1019 | static ssize_t metrics_bytes_identical_show(struct device *fbdev, | |
1020 | struct device_attribute *a, char *buf) { | |
1021 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1022 | struct dlfb_data *dev = fb_info->par; | |
1023 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1024 | atomic_read(&dev->bytes_identical)); | |
1025 | } | |
1026 | ||
1027 | static ssize_t metrics_bytes_sent_show(struct device *fbdev, | |
1028 | struct device_attribute *a, char *buf) { | |
1029 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1030 | struct dlfb_data *dev = fb_info->par; | |
1031 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1032 | atomic_read(&dev->bytes_sent)); | |
1033 | } | |
1034 | ||
1035 | static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev, | |
1036 | struct device_attribute *a, char *buf) { | |
1037 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1038 | struct dlfb_data *dev = fb_info->par; | |
1039 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1040 | atomic_read(&dev->cpu_kcycles_used)); | |
1041 | } | |
1042 | ||
1043 | static ssize_t metrics_misc_show(struct device *fbdev, | |
1044 | struct device_attribute *a, char *buf) { | |
1045 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1046 | struct dlfb_data *dev = fb_info->par; | |
1047 | return snprintf(buf, PAGE_SIZE, | |
1048 | "Calls to\ndamage: %u\nblit: %u\n" | |
1049 | "defio faults: %u\ncopy: %u\n" | |
1050 | "fill: %u\n\n" | |
1051 | "active framebuffer clients: %d\n" | |
1052 | "urbs available %d(%d)\n" | |
1053 | "Shadow framebuffer in use? %s\n" | |
1054 | "Any lost pixels? %s\n", | |
1055 | atomic_read(&dev->damage_count), | |
1056 | atomic_read(&dev->blit_count), | |
1057 | atomic_read(&dev->defio_fault_count), | |
1058 | atomic_read(&dev->copy_count), | |
1059 | atomic_read(&dev->fill_count), | |
1060 | dev->fb_count, | |
1061 | dev->urbs.available, dev->urbs.limit_sem.count, | |
1062 | (dev->backing_buffer) ? "yes" : "no", | |
1063 | atomic_read(&dev->lost_pixels) ? "yes" : "no"); | |
1064 | } | |
1065 | ||
1066 | static ssize_t edid_show(struct kobject *kobj, struct bin_attribute *a, | |
1067 | char *buf, loff_t off, size_t count) { | |
1068 | struct device *fbdev = container_of(kobj, struct device, kobj); | |
1069 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1070 | struct dlfb_data *dev = fb_info->par; | |
1071 | char *edid = &dev->edid[0]; | |
1072 | const size_t size = sizeof(dev->edid); | |
1073 | ||
1074 | if (dlfb_parse_edid(dev, &fb_info->var, fb_info)) | |
1075 | return 0; | |
1076 | ||
1077 | if (off >= size) | |
1078 | return 0; | |
1079 | ||
1080 | if (off + count > size) | |
1081 | count = size - off; | |
1082 | memcpy(buf, edid + off, count); | |
1083 | ||
1084 | return count; | |
1085 | } | |
1086 | ||
1087 | ||
1088 | static ssize_t metrics_reset_store(struct device *fbdev, | |
1089 | struct device_attribute *attr, | |
1090 | const char *buf, size_t count) | |
1091 | { | |
1092 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1093 | struct dlfb_data *dev = fb_info->par; | |
1094 | ||
1095 | atomic_set(&dev->bytes_rendered, 0); | |
1096 | atomic_set(&dev->bytes_identical, 0); | |
1097 | atomic_set(&dev->bytes_sent, 0); | |
1098 | atomic_set(&dev->cpu_kcycles_used, 0); | |
1099 | atomic_set(&dev->blit_count, 0); | |
1100 | atomic_set(&dev->copy_count, 0); | |
1101 | atomic_set(&dev->fill_count, 0); | |
1102 | atomic_set(&dev->defio_fault_count, 0); | |
1103 | atomic_set(&dev->damage_count, 0); | |
1104 | ||
1105 | return count; | |
1106 | } | |
1107 | ||
1108 | static ssize_t use_defio_show(struct device *fbdev, | |
1109 | struct device_attribute *a, char *buf) { | |
1110 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1111 | struct dlfb_data *dev = fb_info->par; | |
1112 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
1113 | atomic_read(&dev->use_defio)); | |
1114 | } | |
1115 | ||
1116 | static ssize_t use_defio_store(struct device *fbdev, | |
1117 | struct device_attribute *attr, | |
1118 | const char *buf, size_t count) | |
1119 | { | |
1120 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1121 | struct dlfb_data *dev = fb_info->par; | |
1122 | ||
1123 | if (count > 0) { | |
1124 | if (buf[0] == '0') | |
1125 | atomic_set(&dev->use_defio, 0); | |
1126 | if (buf[0] == '1') | |
1127 | atomic_set(&dev->use_defio, 1); | |
1128 | } | |
1129 | return count; | |
1130 | } | |
1131 | ||
1132 | static struct bin_attribute edid_attr = { | |
1133 | .attr.name = "edid", | |
1134 | .attr.mode = 0444, | |
1135 | .size = 128, | |
1136 | .read = edid_show, | |
1137 | }; | |
1138 | ||
1139 | static struct device_attribute fb_device_attrs[] = { | |
1140 | __ATTR_RO(metrics_bytes_rendered), | |
1141 | __ATTR_RO(metrics_bytes_identical), | |
1142 | __ATTR_RO(metrics_bytes_sent), | |
1143 | __ATTR_RO(metrics_cpu_kcycles_used), | |
1144 | __ATTR_RO(metrics_misc), | |
1145 | __ATTR(metrics_reset, S_IWUGO, NULL, metrics_reset_store), | |
1146 | __ATTR_RW(use_defio), | |
1147 | }; | |
1148 | ||
3e8f3d6f BT |
1149 | #ifdef CONFIG_FB_DEFERRED_IO |
1150 | static void dlfb_dpy_deferred_io(struct fb_info *info, | |
1151 | struct list_head *pagelist) | |
1152 | { | |
1153 | struct page *cur; | |
1154 | struct fb_deferred_io *fbdefio = info->fbdefio; | |
1155 | struct dlfb_data *dev = info->par; | |
1156 | struct urb *urb; | |
1157 | char *cmd; | |
1158 | cycles_t start_cycles, end_cycles; | |
1159 | int bytes_sent = 0; | |
1160 | int bytes_identical = 0; | |
1161 | int bytes_rendered = 0; | |
1162 | int fault_count = 0; | |
1163 | ||
1164 | if (!atomic_read(&dev->use_defio)) | |
1165 | return; | |
1166 | ||
1167 | if (!atomic_read(&dev->usb_active)) | |
1168 | return; | |
1169 | ||
1170 | start_cycles = get_cycles(); | |
1171 | ||
1172 | urb = dlfb_get_urb(dev); | |
1173 | if (!urb) | |
1174 | return; | |
1175 | cmd = urb->transfer_buffer; | |
1176 | ||
1177 | /* walk the written page list and render each to device */ | |
1178 | list_for_each_entry(cur, &fbdefio->pagelist, lru) { | |
1179 | dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start, | |
1180 | &cmd, cur->index << PAGE_SHIFT, | |
1181 | PAGE_SIZE, &bytes_identical, &bytes_sent); | |
1182 | bytes_rendered += PAGE_SIZE; | |
1183 | fault_count++; | |
1184 | } | |
1185 | ||
1186 | if (cmd > (char *) urb->transfer_buffer) { | |
1187 | /* Send partial buffer remaining before exiting */ | |
1188 | int len = cmd - (char *) urb->transfer_buffer; | |
1189 | dlfb_submit_urb(dev, urb, len); | |
1190 | bytes_sent += len; | |
1191 | } else | |
1192 | dlfb_urb_completion(urb); | |
1193 | ||
1194 | atomic_add(fault_count, &dev->defio_fault_count); | |
1195 | atomic_add(bytes_sent, &dev->bytes_sent); | |
1196 | atomic_add(bytes_identical, &dev->bytes_identical); | |
1197 | atomic_add(bytes_rendered, &dev->bytes_rendered); | |
1198 | end_cycles = get_cycles(); | |
1199 | atomic_add(((unsigned int) ((end_cycles - start_cycles) | |
1200 | >> 10)), /* Kcycles */ | |
1201 | &dev->cpu_kcycles_used); | |
1202 | } | |
1203 | ||
1204 | static struct fb_deferred_io dlfb_defio = { | |
1205 | .delay = 5, | |
1206 | .deferred_io = dlfb_dpy_deferred_io, | |
1207 | }; | |
1208 | ||
1209 | #endif | |
1210 | ||
cc403dc6 BT |
1211 | /* |
1212 | * This is necessary before we can communicate with the display controller. | |
1213 | */ | |
1214 | static int dlfb_select_std_channel(struct dlfb_data *dev) | |
1215 | { | |
1216 | int ret; | |
1217 | u8 set_def_chn[] = { 0x57, 0xCD, 0xDC, 0xA7, | |
1218 | 0x1C, 0x88, 0x5E, 0x15, | |
1219 | 0x60, 0xFE, 0xC6, 0x97, | |
1220 | 0x16, 0x3D, 0x47, 0xF2 }; | |
1221 | ||
1222 | ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
1223 | NR_USB_REQUEST_CHANNEL, | |
1224 | (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, | |
1225 | set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT); | |
1226 | return ret; | |
1227 | } | |
1228 | ||
2469d5db BT |
1229 | |
1230 | static int dlfb_usb_probe(struct usb_interface *interface, | |
59277b67 | 1231 | const struct usb_device_id *id) |
88e58b1a | 1232 | { |
59277b67 BT |
1233 | struct usb_device *usbdev; |
1234 | struct dlfb_data *dev; | |
88e58b1a | 1235 | struct fb_info *info; |
59277b67 | 1236 | int videomemorysize; |
2469d5db | 1237 | int i; |
59277b67 BT |
1238 | unsigned char *videomemory; |
1239 | int retval = -ENOMEM; | |
1240 | struct fb_var_screeninfo *var; | |
2469d5db BT |
1241 | int registered = 0; |
1242 | u16 *pix_framebuffer; | |
59277b67 | 1243 | |
2469d5db BT |
1244 | /* usb initialization */ |
1245 | ||
1246 | usbdev = interface_to_usbdev(interface); | |
59277b67 BT |
1247 | |
1248 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1249 | if (dev == NULL) { | |
2469d5db BT |
1250 | err("dlfb_usb_probe: failed alloc of dev struct\n"); |
1251 | goto error; | |
88e58b1a | 1252 | } |
88e58b1a | 1253 | |
2469d5db BT |
1254 | /* we need to wait for both usb and fbdev to spin down on disconnect */ |
1255 | kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */ | |
1256 | kref_get(&dev->kref); /* matching kref_put in .fb_destroy function*/ | |
1257 | ||
59277b67 | 1258 | dev->udev = usbdev; |
4a4854dd | 1259 | dev->gdev = &usbdev->dev; /* our generic struct device * */ |
59277b67 BT |
1260 | usb_set_intfdata(interface, dev); |
1261 | ||
2469d5db BT |
1262 | if (!dlfb_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) { |
1263 | retval = -ENOMEM; | |
1264 | dl_err("dlfb_alloc_urb_list failed\n"); | |
1265 | goto error; | |
1266 | } | |
1267 | ||
1268 | mutex_init(&dev->fb_open_lock); | |
59277b67 | 1269 | |
2469d5db | 1270 | /* We don't register a new USB class. Our client interface is fbdev */ |
59277b67 | 1271 | |
2469d5db BT |
1272 | /* allocates framebuffer driver structure, not framebuffer memory */ |
1273 | info = framebuffer_alloc(0, &usbdev->dev); | |
1274 | if (!info) { | |
1275 | retval = -ENOMEM; | |
1276 | dl_err("framebuffer_alloc failed\n"); | |
1277 | goto error; | |
1278 | } | |
59277b67 BT |
1279 | dev->info = info; |
1280 | info->par = dev; | |
1281 | info->pseudo_palette = dev->pseudo_palette; | |
2469d5db | 1282 | info->fbops = &dlfb_ops; |
59277b67 BT |
1283 | |
1284 | var = &info->var; | |
2469d5db BT |
1285 | |
1286 | /* TODO set limit based on actual SKU detection */ | |
1287 | dev->sku_pixel_limit = 2048 * 1152; | |
1288 | ||
1289 | INIT_LIST_HEAD(&info->modelist); | |
1290 | dlfb_parse_edid(dev, var, info); | |
88e58b1a | 1291 | |
59277b67 BT |
1292 | /* |
1293 | * ok, now that we've got the size info, we can alloc our framebuffer. | |
59277b67 | 1294 | */ |
59277b67 BT |
1295 | info->fix = dlfb_fix; |
1296 | info->fix.line_length = var->xres * (var->bits_per_pixel / 8); | |
1297 | videomemorysize = info->fix.line_length * var->yres; | |
1298 | ||
1299 | /* | |
1300 | * The big chunk of system memory we use as a virtual framebuffer. | |
2469d5db | 1301 | * TODO: Handle fbcon cursor code calling blit in interrupt context |
59277b67 BT |
1302 | */ |
1303 | videomemory = vmalloc(videomemorysize); | |
2469d5db BT |
1304 | if (!videomemory) { |
1305 | retval = -ENOMEM; | |
1306 | dl_err("Virtual framebuffer alloc failed\n"); | |
1307 | goto error; | |
1308 | } | |
59277b67 BT |
1309 | |
1310 | info->screen_base = videomemory; | |
1311 | info->fix.smem_len = PAGE_ALIGN(videomemorysize); | |
1312 | info->fix.smem_start = (unsigned long) videomemory; | |
2469d5db BT |
1313 | info->flags = udlfb_info_flags; |
1314 | ||
88e58b1a | 1315 | |
59277b67 BT |
1316 | /* |
1317 | * Second framebuffer copy, mirroring the state of the framebuffer | |
1318 | * on the physical USB device. We can function without this. | |
1319 | * But with imperfect damage info we may end up sending pixels over USB | |
1320 | * that were, in fact, unchanged -- wasting limited USB bandwidth | |
1321 | */ | |
2469d5db | 1322 | dev->backing_buffer = vmalloc(videomemorysize); |
59277b67 | 1323 | if (!dev->backing_buffer) |
2469d5db BT |
1324 | dl_warn("No shadow/backing buffer allcoated\n"); |
1325 | else | |
1326 | memset(dev->backing_buffer, 0, videomemorysize); | |
f05e0575 | 1327 | |
2469d5db BT |
1328 | retval = fb_alloc_cmap(&info->cmap, 256, 0); |
1329 | if (retval < 0) { | |
1330 | dl_err("fb_alloc_cmap failed %x\n", retval); | |
1331 | goto error; | |
1332 | } | |
88e58b1a | 1333 | |
2469d5db | 1334 | /* ready to begin using device */ |
88e58b1a | 1335 | |
2469d5db BT |
1336 | #ifdef CONFIG_FB_DEFERRED_IO |
1337 | atomic_set(&dev->use_defio, 1); | |
1338 | #endif | |
2469d5db BT |
1339 | atomic_set(&dev->usb_active, 1); |
1340 | dlfb_select_std_channel(dev); | |
88e58b1a | 1341 | |
2469d5db BT |
1342 | dlfb_ops_check_var(var, info); |
1343 | dlfb_ops_set_par(info); | |
88e58b1a | 1344 | |
2469d5db | 1345 | /* paint greenscreen */ |
2469d5db BT |
1346 | pix_framebuffer = (u16 *) videomemory; |
1347 | for (i = 0; i < videomemorysize / 2; i++) | |
1348 | pix_framebuffer[i] = 0x37e6; | |
88e58b1a | 1349 | |
2469d5db BT |
1350 | dlfb_handle_damage(dev, 0, 0, info->var.xres, info->var.yres, |
1351 | videomemory); | |
530f43a8 | 1352 | |
2469d5db | 1353 | retval = register_framebuffer(info); |
59277b67 | 1354 | if (retval < 0) { |
2469d5db BT |
1355 | dl_err("register_framebuffer failed %d\n", retval); |
1356 | goto error; | |
7316bc55 | 1357 | } |
2469d5db | 1358 | registered = 1; |
88e58b1a | 1359 | |
2469d5db BT |
1360 | for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) |
1361 | device_create_file(info->dev, &fb_device_attrs[i]); | |
88e58b1a | 1362 | |
2469d5db | 1363 | device_create_bin_file(info->dev, &edid_attr); |
88e58b1a | 1364 | |
2469d5db BT |
1365 | dl_err("DisplayLink USB device /dev/fb%d attached. %dx%d resolution." |
1366 | " Using %dK framebuffer memory\n", info->node, | |
1367 | var->xres, var->yres, | |
1368 | ((dev->backing_buffer) ? | |
1369 | videomemorysize * 2 : videomemorysize) >> 10); | |
88e58b1a RDI |
1370 | return 0; |
1371 | ||
2469d5db BT |
1372 | error: |
1373 | if (dev) { | |
1374 | if (registered) { | |
1375 | unregister_framebuffer(info); | |
1376 | dlfb_ops_destroy(info); | |
1377 | } else | |
1378 | kref_put(&dev->kref, dlfb_delete); | |
1379 | ||
1380 | if (dev->urbs.count > 0) | |
1381 | dlfb_free_urb_list(dev); | |
1382 | kref_put(&dev->kref, dlfb_delete); /* last ref from kref_init */ | |
1383 | ||
1384 | /* dev has been deallocated. Do not dereference */ | |
1385 | } | |
1386 | ||
59277b67 | 1387 | return retval; |
88e58b1a RDI |
1388 | } |
1389 | ||
2469d5db | 1390 | static void dlfb_usb_disconnect(struct usb_interface *interface) |
88e58b1a | 1391 | { |
59277b67 BT |
1392 | struct dlfb_data *dev; |
1393 | struct fb_info *info; | |
2469d5db | 1394 | int i; |
88e58b1a | 1395 | |
59277b67 | 1396 | dev = usb_get_intfdata(interface); |
2469d5db BT |
1397 | info = dev->info; |
1398 | ||
1399 | /* when non-active we'll update virtual framebuffer, but no new urbs */ | |
1400 | atomic_set(&dev->usb_active, 0); | |
1401 | ||
88e58b1a | 1402 | usb_set_intfdata(interface, NULL); |
59277b67 | 1403 | |
2469d5db BT |
1404 | for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) |
1405 | device_remove_file(info->dev, &fb_device_attrs[i]); | |
1406 | ||
1407 | device_remove_bin_file(info->dev, &edid_attr); | |
1408 | ||
1409 | /* this function will wait for all in-flight urbs to complete */ | |
1410 | dlfb_free_urb_list(dev); | |
59277b67 BT |
1411 | |
1412 | if (info) { | |
2469d5db | 1413 | dl_notice("Detaching /dev/fb%d\n", info->node); |
59277b67 | 1414 | unregister_framebuffer(info); |
2469d5db | 1415 | dlfb_ops_destroy(info); |
88e58b1a RDI |
1416 | } |
1417 | ||
2469d5db BT |
1418 | /* release reference taken by kref_init in probe() */ |
1419 | kref_put(&dev->kref, dlfb_delete); | |
88e58b1a | 1420 | |
2469d5db BT |
1421 | /* consider dlfb_data freed */ |
1422 | ||
1423 | return; | |
88e58b1a RDI |
1424 | } |
1425 | ||
1426 | static struct usb_driver dlfb_driver = { | |
1427 | .name = "udlfb", | |
2469d5db BT |
1428 | .probe = dlfb_usb_probe, |
1429 | .disconnect = dlfb_usb_disconnect, | |
88e58b1a RDI |
1430 | .id_table = id_table, |
1431 | }; | |
1432 | ||
2469d5db | 1433 | static int __init dlfb_module_init(void) |
88e58b1a RDI |
1434 | { |
1435 | int res; | |
1436 | ||
88e58b1a RDI |
1437 | res = usb_register(&dlfb_driver); |
1438 | if (res) | |
1439 | err("usb_register failed. Error number %d", res); | |
1440 | ||
1441 | printk("VMODES initialized\n"); | |
1442 | ||
1443 | return res; | |
1444 | } | |
1445 | ||
2469d5db | 1446 | static void __exit dlfb_module_exit(void) |
88e58b1a RDI |
1447 | { |
1448 | usb_deregister(&dlfb_driver); | |
1449 | } | |
1450 | ||
2469d5db BT |
1451 | module_init(dlfb_module_init); |
1452 | module_exit(dlfb_module_exit); | |
88e58b1a | 1453 | |
4a4854dd BT |
1454 | static void dlfb_urb_completion(struct urb *urb) |
1455 | { | |
1456 | struct urb_node *unode = urb->context; | |
1457 | struct dlfb_data *dev = unode->dev; | |
1458 | unsigned long flags; | |
1459 | ||
1460 | /* sync/async unlink faults aren't errors */ | |
1461 | if (urb->status) { | |
1462 | if (!(urb->status == -ENOENT || | |
1463 | urb->status == -ECONNRESET || | |
1464 | urb->status == -ESHUTDOWN)) { | |
1465 | dl_err("%s - nonzero write bulk status received: %d\n", | |
1466 | __func__, urb->status); | |
1467 | atomic_set(&dev->lost_pixels, 1); | |
1468 | } | |
1469 | } | |
1470 | ||
1471 | urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */ | |
1472 | ||
1473 | spin_lock_irqsave(&dev->urbs.lock, flags); | |
1474 | list_add_tail(&unode->entry, &dev->urbs.list); | |
1475 | dev->urbs.available++; | |
1476 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1477 | ||
1478 | up(&dev->urbs.limit_sem); | |
1479 | } | |
1480 | ||
1481 | static void dlfb_free_urb_list(struct dlfb_data *dev) | |
1482 | { | |
1483 | int count = dev->urbs.count; | |
1484 | struct list_head *node; | |
1485 | struct urb_node *unode; | |
1486 | struct urb *urb; | |
1487 | int ret; | |
1488 | unsigned long flags; | |
1489 | ||
1490 | dl_notice("Waiting for completes and freeing all render urbs\n"); | |
1491 | ||
1492 | /* keep waiting and freeing, until we've got 'em all */ | |
1493 | while (count--) { | |
1494 | /* Timeout means a memory leak and/or fault */ | |
1495 | ret = down_timeout(&dev->urbs.limit_sem, FREE_URB_TIMEOUT); | |
1496 | if (ret) { | |
1497 | BUG_ON(ret); | |
1498 | break; | |
1499 | } | |
1500 | spin_lock_irqsave(&dev->urbs.lock, flags); | |
1501 | ||
1502 | node = dev->urbs.list.next; /* have reserved one with sem */ | |
1503 | list_del_init(node); | |
1504 | ||
1505 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1506 | ||
1507 | unode = list_entry(node, struct urb_node, entry); | |
1508 | urb = unode->urb; | |
1509 | ||
1510 | /* Free each separately allocated piece */ | |
1511 | usb_buffer_free(urb->dev, dev->urbs.size, | |
1512 | urb->transfer_buffer, urb->transfer_dma); | |
1513 | usb_free_urb(urb); | |
1514 | kfree(node); | |
1515 | } | |
1516 | ||
1517 | kref_put(&dev->kref, dlfb_delete); | |
1518 | ||
1519 | } | |
1520 | ||
1521 | static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size) | |
1522 | { | |
1523 | int i = 0; | |
1524 | struct urb *urb; | |
1525 | struct urb_node *unode; | |
1526 | char *buf; | |
1527 | ||
1528 | spin_lock_init(&dev->urbs.lock); | |
1529 | ||
1530 | dev->urbs.size = size; | |
1531 | INIT_LIST_HEAD(&dev->urbs.list); | |
1532 | ||
1533 | while (i < count) { | |
1534 | unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL); | |
1535 | if (!unode) | |
1536 | break; | |
1537 | unode->dev = dev; | |
1538 | ||
1539 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
1540 | if (!urb) { | |
1541 | kfree(unode); | |
1542 | break; | |
1543 | } | |
1544 | unode->urb = urb; | |
1545 | ||
1546 | buf = usb_buffer_alloc(dev->udev, MAX_TRANSFER, GFP_KERNEL, | |
1547 | &urb->transfer_dma); | |
1548 | if (!buf) { | |
1549 | kfree(unode); | |
1550 | usb_free_urb(urb); | |
1551 | break; | |
1552 | } | |
1553 | ||
1554 | /* urb->transfer_buffer_length set to actual before submit */ | |
1555 | usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1), | |
1556 | buf, size, dlfb_urb_completion, unode); | |
1557 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
1558 | ||
1559 | list_add_tail(&unode->entry, &dev->urbs.list); | |
1560 | ||
1561 | i++; | |
1562 | } | |
1563 | ||
1564 | sema_init(&dev->urbs.limit_sem, i); | |
1565 | dev->urbs.count = i; | |
1566 | dev->urbs.available = i; | |
1567 | ||
1568 | kref_get(&dev->kref); /* released in free_render_urbs() */ | |
1569 | ||
1570 | dl_notice("allocated %d %d byte urbs \n", i, (int) size); | |
1571 | ||
1572 | return i; | |
1573 | } | |
1574 | ||
1575 | static struct urb *dlfb_get_urb(struct dlfb_data *dev) | |
1576 | { | |
1577 | int ret = 0; | |
1578 | struct list_head *entry; | |
1579 | struct urb_node *unode; | |
1580 | struct urb *urb = NULL; | |
1581 | unsigned long flags; | |
1582 | ||
1583 | /* Wait for an in-flight buffer to complete and get re-queued */ | |
1584 | ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT); | |
1585 | if (ret) { | |
1586 | atomic_set(&dev->lost_pixels, 1); | |
1587 | dl_err("wait for urb interrupted: %x\n", ret); | |
1588 | goto error; | |
1589 | } | |
1590 | ||
1591 | spin_lock_irqsave(&dev->urbs.lock, flags); | |
1592 | ||
1593 | BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */ | |
1594 | entry = dev->urbs.list.next; | |
1595 | list_del_init(entry); | |
1596 | dev->urbs.available--; | |
1597 | ||
1598 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1599 | ||
1600 | unode = list_entry(entry, struct urb_node, entry); | |
1601 | urb = unode->urb; | |
1602 | ||
1603 | error: | |
1604 | return urb; | |
1605 | } | |
1606 | ||
1607 | static int dlfb_submit_urb(struct dlfb_data *dev, struct urb *urb, size_t len) | |
1608 | { | |
1609 | int ret; | |
1610 | ||
1611 | BUG_ON(len > dev->urbs.size); | |
1612 | ||
1613 | urb->transfer_buffer_length = len; /* set to actual payload len */ | |
1614 | ret = usb_submit_urb(urb, GFP_KERNEL); | |
1615 | if (ret) { | |
1616 | dlfb_urb_completion(urb); /* because no one else will */ | |
1617 | atomic_set(&dev->lost_pixels, 1); | |
1618 | dl_err("usb_submit_urb error %x\n", ret); | |
1619 | } | |
1620 | return ret; | |
1621 | } | |
1622 | ||
59277b67 | 1623 | MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, " |
2469d5db BT |
1624 | "Jaya Kumar <jayakumar.lkml@gmail.com>, " |
1625 | "Bernie Thompson <bernie@plugable.com>"); | |
1626 | MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); | |
88e58b1a | 1627 | MODULE_LICENSE("GPL"); |
2469d5db | 1628 |