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 | 18 | |
81f6f3c1 PM |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
20 | ||
88e58b1a RDI |
21 | #include <linux/module.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/usb.h> | |
25 | #include <linux/uaccess.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/fb.h> | |
fb299002 | 28 | #include <linux/vmalloc.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
268bb0ce | 30 | #include <linux/prefetch.h> |
33077b8d | 31 | #include <linux/delay.h> |
96f8d864 | 32 | #include <video/udlfb.h> |
b9f03a3c | 33 | #include "edid.h" |
88e58b1a | 34 | |
59277b67 | 35 | static struct fb_fix_screeninfo dlfb_fix = { |
2469d5db | 36 | .id = "udlfb", |
1d31a9ee BT |
37 | .type = FB_TYPE_PACKED_PIXELS, |
38 | .visual = FB_VISUAL_TRUECOLOR, | |
39 | .xpanstep = 0, | |
40 | .ypanstep = 0, | |
41 | .ywrapstep = 0, | |
42 | .accel = FB_ACCEL_NONE, | |
59277b67 | 43 | }; |
88e58b1a | 44 | |
2469d5db | 45 | static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST | |
2469d5db | 46 | FBINFO_VIRTFB | |
2469d5db BT |
47 | FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | |
48 | FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; | |
49 | ||
cc403dc6 BT |
50 | /* |
51 | * There are many DisplayLink-based products, all with unique PIDs. We are able | |
52 | * to support all volume ones (circa 2009) with a single driver, so we match | |
53 | * globally on VID. TODO: Probe() needs to detect when we might be running | |
54 | * "future" chips, and bail on those, so a compatible driver can match. | |
55 | */ | |
56 | static struct usb_device_id id_table[] = { | |
57 | {.idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,}, | |
58 | {}, | |
59 | }; | |
60 | MODULE_DEVICE_TABLE(usb, id_table); | |
88e58b1a | 61 | |
d5ed5432 BT |
62 | /* module options */ |
63 | static int console; /* Optionally allow fbcon to consume first framebuffer */ | |
64 | static int fb_defio; /* Optionally enable experimental fb_defio mmap support */ | |
dd8015f1 | 65 | |
4a4854dd BT |
66 | /* dlfb keeps a list of urbs for efficient bulk transfers */ |
67 | static void dlfb_urb_completion(struct urb *urb); | |
68 | static struct urb *dlfb_get_urb(struct dlfb_data *dev); | |
69 | static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len); | |
70 | static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size); | |
71 | static void dlfb_free_urb_list(struct dlfb_data *dev); | |
72 | ||
59277b67 | 73 | /* |
bd80816b BT |
74 | * All DisplayLink bulk operations start with 0xAF, followed by specific code |
75 | * All operations are written to buffers which then later get sent to device | |
59277b67 | 76 | */ |
4574203f | 77 | static char *dlfb_set_register(char *buf, u8 reg, u8 val) |
88e58b1a | 78 | { |
1d31a9ee BT |
79 | *buf++ = 0xAF; |
80 | *buf++ = 0x20; | |
81 | *buf++ = reg; | |
82 | *buf++ = val; | |
83 | return buf; | |
59277b67 | 84 | } |
88e58b1a | 85 | |
4574203f | 86 | static char *dlfb_vidreg_lock(char *buf) |
59277b67 | 87 | { |
4574203f | 88 | return dlfb_set_register(buf, 0xFF, 0x00); |
59277b67 | 89 | } |
88e58b1a | 90 | |
4574203f | 91 | static char *dlfb_vidreg_unlock(char *buf) |
59277b67 | 92 | { |
4574203f | 93 | return dlfb_set_register(buf, 0xFF, 0xFF); |
59277b67 BT |
94 | } |
95 | ||
96 | /* | |
530f43a8 | 97 | * On/Off for driving the DisplayLink framebuffer to the display |
9825f70f BT |
98 | * 0x00 H and V sync on |
99 | * 0x01 H and V sync off (screen blank but powered) | |
100 | * 0x07 DPMS powerdown (requires modeset to come back) | |
59277b67 | 101 | */ |
530f43a8 | 102 | static char *dlfb_enable_hvsync(char *buf, bool enable) |
59277b67 | 103 | { |
530f43a8 BT |
104 | if (enable) |
105 | return dlfb_set_register(buf, 0x1F, 0x00); | |
106 | else | |
9825f70f | 107 | return dlfb_set_register(buf, 0x1F, 0x07); |
59277b67 BT |
108 | } |
109 | ||
4574203f | 110 | static char *dlfb_set_color_depth(char *buf, u8 selection) |
59277b67 | 111 | { |
4574203f | 112 | return dlfb_set_register(buf, 0x00, selection); |
59277b67 BT |
113 | } |
114 | ||
4574203f | 115 | static char *dlfb_set_base16bpp(char *wrptr, u32 base) |
59277b67 | 116 | { |
1d31a9ee | 117 | /* the base pointer is 16 bits wide, 0x20 is hi byte. */ |
4574203f BT |
118 | wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); |
119 | wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); | |
120 | return dlfb_set_register(wrptr, 0x22, base); | |
59277b67 BT |
121 | } |
122 | ||
bd80816b BT |
123 | /* |
124 | * DisplayLink HW has separate 16bpp and 8bpp framebuffers. | |
125 | * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer | |
126 | */ | |
4574203f | 127 | static char *dlfb_set_base8bpp(char *wrptr, u32 base) |
59277b67 | 128 | { |
4574203f BT |
129 | wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); |
130 | wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); | |
131 | return dlfb_set_register(wrptr, 0x28, base); | |
59277b67 BT |
132 | } |
133 | ||
4574203f | 134 | static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) |
59277b67 | 135 | { |
4574203f BT |
136 | wrptr = dlfb_set_register(wrptr, reg, value >> 8); |
137 | return dlfb_set_register(wrptr, reg+1, value); | |
59277b67 BT |
138 | } |
139 | ||
140 | /* | |
141 | * This is kind of weird because the controller takes some | |
142 | * register values in a different byte order than other registers. | |
143 | */ | |
4574203f | 144 | static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) |
59277b67 | 145 | { |
4574203f BT |
146 | wrptr = dlfb_set_register(wrptr, reg, value); |
147 | return dlfb_set_register(wrptr, reg+1, value >> 8); | |
59277b67 BT |
148 | } |
149 | ||
150 | /* | |
151 | * LFSR is linear feedback shift register. The reason we have this is | |
152 | * because the display controller needs to minimize the clock depth of | |
153 | * various counters used in the display path. So this code reverses the | |
154 | * provided value into the lfsr16 value by counting backwards to get | |
155 | * the value that needs to be set in the hardware comparator to get the | |
156 | * same actual count. This makes sense once you read above a couple of | |
157 | * times and think about it from a hardware perspective. | |
158 | */ | |
bd80816b | 159 | static u16 dlfb_lfsr16(u16 actual_count) |
59277b67 BT |
160 | { |
161 | u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ | |
162 | ||
163 | while (actual_count--) { | |
164 | lv = ((lv << 1) | | |
165 | (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) | |
166 | & 0xFFFF; | |
88e58b1a RDI |
167 | } |
168 | ||
59277b67 BT |
169 | return (u16) lv; |
170 | } | |
171 | ||
172 | /* | |
173 | * This does LFSR conversion on the value that is to be written. | |
174 | * See LFSR explanation above for more detail. | |
175 | */ | |
4574203f | 176 | static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) |
59277b67 | 177 | { |
bd80816b | 178 | return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); |
88e58b1a RDI |
179 | } |
180 | ||
59277b67 BT |
181 | /* |
182 | * This takes a standard fbdev screeninfo struct and all of its monitor mode | |
183 | * details and converts them into the DisplayLink equivalent register commands. | |
184 | */ | |
4574203f | 185 | static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) |
88e58b1a | 186 | { |
59277b67 BT |
187 | u16 xds, yds; |
188 | u16 xde, yde; | |
189 | u16 yec; | |
190 | ||
59277b67 BT |
191 | /* x display start */ |
192 | xds = var->left_margin + var->hsync_len; | |
4574203f | 193 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); |
59277b67 BT |
194 | /* x display end */ |
195 | xde = xds + var->xres; | |
4574203f | 196 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); |
59277b67 BT |
197 | |
198 | /* y display start */ | |
199 | yds = var->upper_margin + var->vsync_len; | |
4574203f | 200 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); |
59277b67 BT |
201 | /* y display end */ |
202 | yde = yds + var->yres; | |
4574203f | 203 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); |
59277b67 BT |
204 | |
205 | /* x end count is active + blanking - 1 */ | |
4574203f BT |
206 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, |
207 | xde + var->right_margin - 1); | |
59277b67 BT |
208 | |
209 | /* libdlo hardcodes hsync start to 1 */ | |
4574203f | 210 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); |
59277b67 BT |
211 | |
212 | /* hsync end is width of sync pulse + 1 */ | |
4574203f | 213 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); |
59277b67 BT |
214 | |
215 | /* hpixels is active pixels */ | |
4574203f | 216 | wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); |
88e58b1a | 217 | |
59277b67 BT |
218 | /* yendcount is vertical active + vertical blanking */ |
219 | yec = var->yres + var->upper_margin + var->lower_margin + | |
220 | var->vsync_len; | |
4574203f | 221 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); |
88e58b1a | 222 | |
59277b67 | 223 | /* libdlo hardcodes vsync start to 0 */ |
4574203f | 224 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); |
59277b67 BT |
225 | |
226 | /* vsync end is width of vsync pulse */ | |
4574203f | 227 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); |
59277b67 BT |
228 | |
229 | /* vpixels is active pixels */ | |
4574203f | 230 | wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); |
59277b67 BT |
231 | |
232 | /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ | |
4574203f BT |
233 | wrptr = dlfb_set_register_16be(wrptr, 0x1B, |
234 | 200*1000*1000/var->pixclock); | |
59277b67 BT |
235 | |
236 | return wrptr; | |
237 | } | |
238 | ||
239 | /* | |
240 | * This takes a standard fbdev screeninfo struct that was fetched or prepared | |
241 | * and then generates the appropriate command sequence that then drives the | |
242 | * display controller. | |
243 | */ | |
244 | static int dlfb_set_video_mode(struct dlfb_data *dev, | |
245 | struct fb_var_screeninfo *var) | |
246 | { | |
247 | char *buf; | |
248 | char *wrptr; | |
249 | int retval = 0; | |
250 | int writesize; | |
530f43a8 BT |
251 | struct urb *urb; |
252 | ||
253 | if (!atomic_read(&dev->usb_active)) | |
254 | return -EPERM; | |
59277b67 | 255 | |
530f43a8 BT |
256 | urb = dlfb_get_urb(dev); |
257 | if (!urb) | |
258 | return -ENOMEM; | |
2685cffa | 259 | |
530f43a8 | 260 | buf = (char *) urb->transfer_buffer; |
59277b67 BT |
261 | |
262 | /* | |
263 | * This first section has to do with setting the base address on the | |
264 | * controller * associated with the display. There are 2 base | |
265 | * pointers, currently, we only * use the 16 bpp segment. | |
266 | */ | |
4574203f BT |
267 | wrptr = dlfb_vidreg_lock(buf); |
268 | wrptr = dlfb_set_color_depth(wrptr, 0x00); | |
59277b67 | 269 | /* set base for 16bpp segment to 0 */ |
4574203f | 270 | wrptr = dlfb_set_base16bpp(wrptr, 0); |
59277b67 | 271 | /* set base for 8bpp segment to end of fb */ |
4574203f | 272 | wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len); |
59277b67 | 273 | |
4574203f | 274 | wrptr = dlfb_set_vid_cmds(wrptr, var); |
530f43a8 | 275 | wrptr = dlfb_enable_hvsync(wrptr, true); |
4574203f | 276 | wrptr = dlfb_vidreg_unlock(wrptr); |
59277b67 BT |
277 | |
278 | writesize = wrptr - buf; | |
279 | ||
530f43a8 | 280 | retval = dlfb_submit_urb(dev, urb, writesize); |
59277b67 | 281 | |
59277b67 BT |
282 | return retval; |
283 | } | |
284 | ||
4574203f | 285 | static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) |
88e58b1a RDI |
286 | { |
287 | unsigned long start = vma->vm_start; | |
288 | unsigned long size = vma->vm_end - vma->vm_start; | |
289 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
290 | unsigned long page, pos; | |
291 | ||
f05e0575 | 292 | if (offset + size > info->fix.smem_len) |
88e58b1a | 293 | return -EINVAL; |
88e58b1a RDI |
294 | |
295 | pos = (unsigned long)info->fix.smem_start + offset; | |
296 | ||
81f6f3c1 | 297 | pr_notice("mmap() framebuffer addr:%lu size:%lu\n", |
2685cffa BT |
298 | pos, size); |
299 | ||
88e58b1a RDI |
300 | while (size > 0) { |
301 | page = vmalloc_to_pfn((void *)pos); | |
f05e0575 | 302 | if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) |
88e58b1a | 303 | return -EAGAIN; |
f05e0575 | 304 | |
88e58b1a RDI |
305 | start += PAGE_SIZE; |
306 | pos += PAGE_SIZE; | |
307 | if (size > PAGE_SIZE) | |
308 | size -= PAGE_SIZE; | |
309 | else | |
310 | size = 0; | |
311 | } | |
312 | ||
313 | vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */ | |
314 | return 0; | |
88e58b1a RDI |
315 | } |
316 | ||
530f43a8 BT |
317 | /* |
318 | * Trims identical data from front and back of line | |
319 | * Sets new front buffer address and width | |
320 | * And returns byte count of identical pixels | |
321 | * Assumes CPU natural alignment (unsigned long) | |
322 | * for back and front buffer ptrs and width | |
323 | */ | |
324 | static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) | |
7316bc55 | 325 | { |
530f43a8 BT |
326 | int j, k; |
327 | const unsigned long *back = (const unsigned long *) bback; | |
328 | const unsigned long *front = (const unsigned long *) *bfront; | |
329 | const int width = *width_bytes / sizeof(unsigned long); | |
330 | int identical = width; | |
331 | int start = width; | |
332 | int end = width; | |
333 | ||
334 | prefetch((void *) front); | |
335 | prefetch((void *) back); | |
336 | ||
337 | for (j = 0; j < width; j++) { | |
338 | if (back[j] != front[j]) { | |
339 | start = j; | |
340 | break; | |
341 | } | |
342 | } | |
7316bc55 | 343 | |
530f43a8 BT |
344 | for (k = width - 1; k > j; k--) { |
345 | if (back[k] != front[k]) { | |
346 | end = k+1; | |
347 | break; | |
348 | } | |
7316bc55 RDI |
349 | } |
350 | ||
530f43a8 BT |
351 | identical = start + (width - end); |
352 | *bfront = (u8 *) &front[start]; | |
353 | *width_bytes = (end - start) * sizeof(unsigned long); | |
354 | ||
355 | return identical * sizeof(unsigned long); | |
7316bc55 RDI |
356 | } |
357 | ||
358 | /* | |
3b7b31fa PM |
359 | * Render a command stream for an encoded horizontal line segment of pixels. |
360 | * | |
361 | * A command buffer holds several commands. | |
362 | * It always begins with a fresh command header | |
363 | * (the protocol doesn't require this, but we enforce it to allow | |
364 | * multiple buffers to be potentially encoded and sent in parallel). | |
365 | * A single command encodes one contiguous horizontal line of pixels | |
366 | * | |
367 | * The function relies on the client to do all allocation, so that | |
368 | * rendering can be done directly to output buffers (e.g. USB URBs). | |
369 | * The function fills the supplied command buffer, providing information | |
370 | * on where it left off, so the client may call in again with additional | |
371 | * buffers if the line will take several buffers to complete. | |
372 | * | |
373 | * A single command can transmit a maximum of 256 pixels, | |
374 | * regardless of the compression ratio (protocol design limit). | |
375 | * To the hardware, 0 for a size byte means 256 | |
2685cffa | 376 | * |
3b7b31fa PM |
377 | * Rather than 256 pixel commands which are either rl or raw encoded, |
378 | * the rlx command simply assumes alternating raw and rl spans within one cmd. | |
379 | * This has a slightly larger header overhead, but produces more even results. | |
380 | * It also processes all data (read and write) in a single pass. | |
381 | * Performance benchmarks of common cases show it having just slightly better | |
2685cffa | 382 | * compression than 256 pixel raw or rle commands, with similar CPU consumpion. |
3b7b31fa PM |
383 | * But for very rl friendly data, will compress not quite as well. |
384 | */ | |
530f43a8 BT |
385 | static void dlfb_compress_hline( |
386 | const uint16_t **pixel_start_ptr, | |
387 | const uint16_t *const pixel_end, | |
388 | uint32_t *device_address_ptr, | |
389 | uint8_t **command_buffer_ptr, | |
390 | const uint8_t *const cmd_buffer_end) | |
88e58b1a | 391 | { |
530f43a8 BT |
392 | const uint16_t *pixel = *pixel_start_ptr; |
393 | uint32_t dev_addr = *device_address_ptr; | |
394 | uint8_t *cmd = *command_buffer_ptr; | |
395 | const int bpp = 2; | |
396 | ||
397 | while ((pixel_end > pixel) && | |
398 | (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { | |
399 | uint8_t *raw_pixels_count_byte = 0; | |
400 | uint8_t *cmd_pixels_count_byte = 0; | |
401 | const uint16_t *raw_pixel_start = 0; | |
402 | const uint16_t *cmd_pixel_start, *cmd_pixel_end = 0; | |
530f43a8 BT |
403 | |
404 | prefetchw((void *) cmd); /* pull in one cache line at least */ | |
405 | ||
406 | *cmd++ = 0xAF; | |
407 | *cmd++ = 0x6B; | |
1572f91c BT |
408 | *cmd++ = (uint8_t) ((dev_addr >> 16) & 0xFF); |
409 | *cmd++ = (uint8_t) ((dev_addr >> 8) & 0xFF); | |
410 | *cmd++ = (uint8_t) ((dev_addr) & 0xFF); | |
530f43a8 BT |
411 | |
412 | cmd_pixels_count_byte = cmd++; /* we'll know this later */ | |
413 | cmd_pixel_start = pixel; | |
414 | ||
415 | raw_pixels_count_byte = cmd++; /* we'll know this later */ | |
416 | raw_pixel_start = pixel; | |
417 | ||
418 | cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1, | |
419 | min((int)(pixel_end - pixel), | |
420 | (int)(cmd_buffer_end - cmd) / bpp)); | |
421 | ||
422 | prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp); | |
423 | ||
424 | while (pixel < cmd_pixel_end) { | |
425 | const uint16_t * const repeating_pixel = pixel; | |
426 | ||
427 | *(uint16_t *)cmd = cpu_to_be16p(pixel); | |
428 | cmd += 2; | |
429 | pixel++; | |
430 | ||
431 | if (unlikely((pixel < cmd_pixel_end) && | |
432 | (*pixel == *repeating_pixel))) { | |
433 | /* go back and fill in raw pixel count */ | |
434 | *raw_pixels_count_byte = ((repeating_pixel - | |
435 | raw_pixel_start) + 1) & 0xFF; | |
436 | ||
437 | while ((pixel < cmd_pixel_end) | |
438 | && (*pixel == *repeating_pixel)) { | |
439 | pixel++; | |
88e58b1a | 440 | } |
59277b67 | 441 | |
530f43a8 BT |
442 | /* immediately after raw data is repeat byte */ |
443 | *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF; | |
59277b67 | 444 | |
530f43a8 BT |
445 | /* Then start another raw pixel span */ |
446 | raw_pixel_start = pixel; | |
447 | raw_pixels_count_byte = cmd++; | |
7316bc55 | 448 | } |
88e58b1a RDI |
449 | } |
450 | ||
530f43a8 BT |
451 | if (pixel > raw_pixel_start) { |
452 | /* finalize last RAW span */ | |
453 | *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF; | |
454 | } | |
88e58b1a | 455 | |
530f43a8 BT |
456 | *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; |
457 | dev_addr += (pixel - cmd_pixel_start) * bpp; | |
88e58b1a RDI |
458 | } |
459 | ||
530f43a8 BT |
460 | if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) { |
461 | /* Fill leftover bytes with no-ops */ | |
462 | if (cmd_buffer_end > cmd) | |
463 | memset(cmd, 0xAF, cmd_buffer_end - cmd); | |
464 | cmd = (uint8_t *) cmd_buffer_end; | |
7316bc55 | 465 | } |
88e58b1a | 466 | |
530f43a8 BT |
467 | *command_buffer_ptr = cmd; |
468 | *pixel_start_ptr = pixel; | |
469 | *device_address_ptr = dev_addr; | |
88e58b1a | 470 | |
530f43a8 | 471 | return; |
88e58b1a RDI |
472 | } |
473 | ||
530f43a8 BT |
474 | /* |
475 | * There are 3 copies of every pixel: The front buffer that the fbdev | |
476 | * client renders to, the actual framebuffer across the USB bus in hardware | |
477 | * (that we can only write to, slowly, and can never read), and (optionally) | |
478 | * our shadow copy that tracks what's been sent to that hardware buffer. | |
479 | */ | |
5bea1fbf | 480 | static int dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr, |
530f43a8 BT |
481 | const char *front, char **urb_buf_ptr, |
482 | u32 byte_offset, u32 byte_width, | |
483 | int *ident_ptr, int *sent_ptr) | |
88e58b1a | 484 | { |
530f43a8 BT |
485 | const u8 *line_start, *line_end, *next_pixel; |
486 | u32 dev_addr = dev->base16 + byte_offset; | |
487 | struct urb *urb = *urb_ptr; | |
488 | u8 *cmd = *urb_buf_ptr; | |
489 | u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; | |
490 | ||
491 | line_start = (u8 *) (front + byte_offset); | |
492 | next_pixel = line_start; | |
493 | line_end = next_pixel + byte_width; | |
494 | ||
495 | if (dev->backing_buffer) { | |
496 | int offset; | |
497 | const u8 *back_start = (u8 *) (dev->backing_buffer | |
498 | + byte_offset); | |
499 | ||
500 | *ident_ptr += dlfb_trim_hline(back_start, &next_pixel, | |
501 | &byte_width); | |
502 | ||
503 | offset = next_pixel - line_start; | |
504 | line_end = next_pixel + byte_width; | |
505 | dev_addr += offset; | |
506 | back_start += offset; | |
507 | line_start += offset; | |
508 | ||
509 | memcpy((char *)back_start, (char *) line_start, | |
510 | byte_width); | |
511 | } | |
88e58b1a | 512 | |
530f43a8 BT |
513 | while (next_pixel < line_end) { |
514 | ||
515 | dlfb_compress_hline((const uint16_t **) &next_pixel, | |
516 | (const uint16_t *) line_end, &dev_addr, | |
517 | (u8 **) &cmd, (u8 *) cmd_end); | |
518 | ||
519 | if (cmd >= cmd_end) { | |
520 | int len = cmd - (u8 *) urb->transfer_buffer; | |
521 | if (dlfb_submit_urb(dev, urb, len)) | |
5bea1fbf | 522 | return 1; /* lost pixels is set */ |
530f43a8 BT |
523 | *sent_ptr += len; |
524 | urb = dlfb_get_urb(dev); | |
525 | if (!urb) | |
5bea1fbf | 526 | return 1; /* lost_pixels is set */ |
530f43a8 BT |
527 | *urb_ptr = urb; |
528 | cmd = urb->transfer_buffer; | |
529 | cmd_end = &cmd[urb->transfer_buffer_length]; | |
88e58b1a | 530 | } |
88e58b1a RDI |
531 | } |
532 | ||
530f43a8 | 533 | *urb_buf_ptr = cmd; |
5bea1fbf BT |
534 | |
535 | return 0; | |
88e58b1a RDI |
536 | } |
537 | ||
530f43a8 BT |
538 | int dlfb_handle_damage(struct dlfb_data *dev, int x, int y, |
539 | int width, int height, char *data) | |
7316bc55 | 540 | { |
7316bc55 | 541 | int i, ret; |
530f43a8 BT |
542 | char *cmd; |
543 | cycles_t start_cycles, end_cycles; | |
544 | int bytes_sent = 0; | |
545 | int bytes_identical = 0; | |
546 | struct urb *urb; | |
547 | int aligned_x; | |
548 | ||
549 | start_cycles = get_cycles(); | |
550 | ||
551 | aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long)); | |
552 | width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long)); | |
553 | x = aligned_x; | |
554 | ||
555 | if ((width <= 0) || | |
556 | (x + width > dev->info->var.xres) || | |
557 | (y + height > dev->info->var.yres)) | |
558 | return -EINVAL; | |
7316bc55 | 559 | |
530f43a8 BT |
560 | if (!atomic_read(&dev->usb_active)) |
561 | return 0; | |
7316bc55 | 562 | |
530f43a8 BT |
563 | urb = dlfb_get_urb(dev); |
564 | if (!urb) | |
565 | return 0; | |
566 | cmd = urb->transfer_buffer; | |
7316bc55 | 567 | |
530f43a8 BT |
568 | for (i = y; i < y + height ; i++) { |
569 | const int line_offset = dev->info->fix.line_length * i; | |
570 | const int byte_offset = line_offset + (x * BPP); | |
7316bc55 | 571 | |
5bea1fbf BT |
572 | if (dlfb_render_hline(dev, &urb, |
573 | (char *) dev->info->fix.smem_start, | |
2685cffa | 574 | &cmd, byte_offset, width * BPP, |
5bea1fbf BT |
575 | &bytes_identical, &bytes_sent)) |
576 | goto error; | |
7316bc55 RDI |
577 | } |
578 | ||
530f43a8 BT |
579 | if (cmd > (char *) urb->transfer_buffer) { |
580 | /* Send partial buffer remaining before exiting */ | |
581 | int len = cmd - (char *) urb->transfer_buffer; | |
582 | ret = dlfb_submit_urb(dev, urb, len); | |
583 | bytes_sent += len; | |
584 | } else | |
585 | dlfb_urb_completion(urb); | |
586 | ||
5bea1fbf | 587 | error: |
530f43a8 BT |
588 | atomic_add(bytes_sent, &dev->bytes_sent); |
589 | atomic_add(bytes_identical, &dev->bytes_identical); | |
590 | atomic_add(width*height*2, &dev->bytes_rendered); | |
591 | end_cycles = get_cycles(); | |
592 | atomic_add(((unsigned int) ((end_cycles - start_cycles) | |
593 | >> 10)), /* Kcycles */ | |
594 | &dev->cpu_kcycles_used); | |
7316bc55 | 595 | |
530f43a8 | 596 | return 0; |
7316bc55 RDI |
597 | } |
598 | ||
d46ecb9f BT |
599 | /* |
600 | * Path triggered by usermode clients who write to filesystem | |
601 | * e.g. cat filename > /dev/fb1 | |
602 | * Not used by X Windows or text-mode console. But useful for testing. | |
603 | * Slow because of extra copy and we must assume all pixels dirty. | |
604 | */ | |
605 | static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf, | |
606 | size_t count, loff_t *ppos) | |
607 | { | |
1a3e528c | 608 | ssize_t result; |
d46ecb9f BT |
609 | struct dlfb_data *dev = info->par; |
610 | u32 offset = (u32) *ppos; | |
611 | ||
d46ecb9f BT |
612 | result = fb_sys_write(info, buf, count, ppos); |
613 | ||
614 | if (result > 0) { | |
615 | int start = max((int)(offset / info->fix.line_length) - 1, 0); | |
616 | int lines = min((u32)((result / info->fix.line_length) + 1), | |
617 | (u32)info->var.yres); | |
618 | ||
619 | dlfb_handle_damage(dev, 0, start, info->var.xres, | |
620 | lines, info->screen_base); | |
621 | } | |
d46ecb9f BT |
622 | |
623 | return result; | |
624 | } | |
625 | ||
530f43a8 BT |
626 | /* hardware has native COPY command (see libdlo), but not worth it for fbcon */ |
627 | static void dlfb_ops_copyarea(struct fb_info *info, | |
628 | const struct fb_copyarea *area) | |
88e58b1a | 629 | { |
88e58b1a | 630 | |
530f43a8 | 631 | struct dlfb_data *dev = info->par; |
88e58b1a | 632 | |
530f43a8 | 633 | sys_copyarea(info, area); |
88e58b1a | 634 | |
530f43a8 BT |
635 | dlfb_handle_damage(dev, area->dx, area->dy, |
636 | area->width, area->height, info->screen_base); | |
530f43a8 | 637 | } |
88e58b1a | 638 | |
530f43a8 BT |
639 | static void dlfb_ops_imageblit(struct fb_info *info, |
640 | const struct fb_image *image) | |
641 | { | |
642 | struct dlfb_data *dev = info->par; | |
88e58b1a | 643 | |
530f43a8 | 644 | sys_imageblit(info, image); |
88e58b1a | 645 | |
530f43a8 BT |
646 | dlfb_handle_damage(dev, image->dx, image->dy, |
647 | image->width, image->height, info->screen_base); | |
88e58b1a RDI |
648 | } |
649 | ||
530f43a8 BT |
650 | static void dlfb_ops_fillrect(struct fb_info *info, |
651 | const struct fb_fillrect *rect) | |
88e58b1a | 652 | { |
88e58b1a RDI |
653 | struct dlfb_data *dev = info->par; |
654 | ||
530f43a8 | 655 | sys_fillrect(info, rect); |
88e58b1a | 656 | |
530f43a8 BT |
657 | dlfb_handle_damage(dev, rect->dx, rect->dy, rect->width, |
658 | rect->height, info->screen_base); | |
88e58b1a RDI |
659 | } |
660 | ||
d5ed5432 BT |
661 | /* |
662 | * NOTE: fb_defio.c is holding info->fbdefio.mutex | |
663 | * Touching ANY framebuffer memory that triggers a page fault | |
664 | * in fb_defio will cause a deadlock, when it also tries to | |
665 | * grab the same mutex. | |
666 | */ | |
667 | static void dlfb_dpy_deferred_io(struct fb_info *info, | |
668 | struct list_head *pagelist) | |
669 | { | |
670 | struct page *cur; | |
671 | struct fb_deferred_io *fbdefio = info->fbdefio; | |
672 | struct dlfb_data *dev = info->par; | |
673 | struct urb *urb; | |
674 | char *cmd; | |
675 | cycles_t start_cycles, end_cycles; | |
676 | int bytes_sent = 0; | |
677 | int bytes_identical = 0; | |
678 | int bytes_rendered = 0; | |
679 | ||
680 | if (!fb_defio) | |
681 | return; | |
682 | ||
683 | if (!atomic_read(&dev->usb_active)) | |
684 | return; | |
685 | ||
686 | start_cycles = get_cycles(); | |
687 | ||
688 | urb = dlfb_get_urb(dev); | |
689 | if (!urb) | |
690 | return; | |
691 | ||
692 | cmd = urb->transfer_buffer; | |
693 | ||
694 | /* walk the written page list and render each to device */ | |
695 | list_for_each_entry(cur, &fbdefio->pagelist, lru) { | |
696 | ||
5bea1fbf | 697 | if (dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start, |
d5ed5432 | 698 | &cmd, cur->index << PAGE_SHIFT, |
5bea1fbf BT |
699 | PAGE_SIZE, &bytes_identical, &bytes_sent)) |
700 | goto error; | |
d5ed5432 BT |
701 | bytes_rendered += PAGE_SIZE; |
702 | } | |
703 | ||
704 | if (cmd > (char *) urb->transfer_buffer) { | |
705 | /* Send partial buffer remaining before exiting */ | |
706 | int len = cmd - (char *) urb->transfer_buffer; | |
707 | dlfb_submit_urb(dev, urb, len); | |
708 | bytes_sent += len; | |
709 | } else | |
710 | dlfb_urb_completion(urb); | |
711 | ||
5bea1fbf | 712 | error: |
d5ed5432 BT |
713 | atomic_add(bytes_sent, &dev->bytes_sent); |
714 | atomic_add(bytes_identical, &dev->bytes_identical); | |
715 | atomic_add(bytes_rendered, &dev->bytes_rendered); | |
716 | end_cycles = get_cycles(); | |
717 | atomic_add(((unsigned int) ((end_cycles - start_cycles) | |
718 | >> 10)), /* Kcycles */ | |
719 | &dev->cpu_kcycles_used); | |
720 | } | |
721 | ||
18dffdf8 | 722 | static int dlfb_get_edid(struct dlfb_data *dev, char *edid, int len) |
7d9485e2 BT |
723 | { |
724 | int i; | |
725 | int ret; | |
18dffdf8 | 726 | char *rbuf; |
7d9485e2 | 727 | |
18dffdf8 BT |
728 | rbuf = kmalloc(2, GFP_KERNEL); |
729 | if (!rbuf) | |
730 | return 0; | |
731 | ||
732 | for (i = 0; i < len; i++) { | |
7d9485e2 BT |
733 | ret = usb_control_msg(dev->udev, |
734 | usb_rcvctrlpipe(dev->udev, 0), (0x02), | |
735 | (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2, | |
18dffdf8 BT |
736 | HZ); |
737 | if (ret < 1) { | |
81f6f3c1 | 738 | pr_err("Read EDID byte %d failed err %x\n", i, ret); |
18dffdf8 BT |
739 | i--; |
740 | break; | |
741 | } | |
742 | edid[i] = rbuf[1]; | |
7d9485e2 | 743 | } |
18dffdf8 BT |
744 | |
745 | kfree(rbuf); | |
746 | ||
747 | return i; | |
7d9485e2 BT |
748 | } |
749 | ||
4574203f | 750 | static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd, |
530f43a8 | 751 | unsigned long arg) |
88e58b1a | 752 | { |
530f43a8 BT |
753 | |
754 | struct dlfb_data *dev = info->par; | |
7316bc55 | 755 | struct dloarea *area = NULL; |
88e58b1a | 756 | |
530f43a8 BT |
757 | if (!atomic_read(&dev->usb_active)) |
758 | return 0; | |
759 | ||
760 | /* TODO: Update X server to get this from sysfs instead */ | |
761 | if (cmd == DLFB_IOCTL_RETURN_EDID) { | |
7316bc55 | 762 | char *edid = (char *)arg; |
18dffdf8 | 763 | if (copy_to_user(edid, dev->edid, dev->edid_size)) |
7316bc55 | 764 | return -EFAULT; |
7316bc55 RDI |
765 | return 0; |
766 | } | |
767 | ||
530f43a8 BT |
768 | /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ |
769 | if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { | |
88e58b1a | 770 | |
5bea1fbf BT |
771 | /* |
772 | * If we have a damage-aware client, turn fb_defio "off" | |
25985edc | 773 | * To avoid perf imact of unnecessary page fault handling. |
5bea1fbf BT |
774 | * Done by resetting the delay for this fb_info to a very |
775 | * long period. Pages will become writable and stay that way. | |
776 | * Reset to normal value when all clients have closed this fb. | |
777 | */ | |
778 | if (info->fbdefio) | |
779 | info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE; | |
780 | ||
88e58b1a RDI |
781 | area = (struct dloarea *)arg; |
782 | ||
783 | if (area->x < 0) | |
784 | area->x = 0; | |
785 | ||
786 | if (area->x > info->var.xres) | |
787 | area->x = info->var.xres; | |
788 | ||
789 | if (area->y < 0) | |
790 | area->y = 0; | |
791 | ||
792 | if (area->y > info->var.yres) | |
793 | area->y = info->var.yres; | |
794 | ||
530f43a8 | 795 | dlfb_handle_damage(dev, area->x, area->y, area->w, area->h, |
88e58b1a RDI |
796 | info->screen_base); |
797 | } | |
7316bc55 | 798 | |
88e58b1a RDI |
799 | return 0; |
800 | } | |
801 | ||
f05e0575 | 802 | /* taken from vesafb */ |
88e58b1a | 803 | static int |
4574203f | 804 | dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green, |
88e58b1a RDI |
805 | unsigned blue, unsigned transp, struct fb_info *info) |
806 | { | |
807 | int err = 0; | |
808 | ||
809 | if (regno >= info->cmap.len) | |
810 | return 1; | |
811 | ||
812 | if (regno < 16) { | |
813 | if (info->var.red.offset == 10) { | |
814 | /* 1:5:5:5 */ | |
815 | ((u32 *) (info->pseudo_palette))[regno] = | |
816 | ((red & 0xf800) >> 1) | | |
817 | ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); | |
818 | } else { | |
819 | /* 0:5:6:5 */ | |
820 | ((u32 *) (info->pseudo_palette))[regno] = | |
821 | ((red & 0xf800)) | | |
822 | ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); | |
823 | } | |
824 | } | |
825 | ||
826 | return err; | |
827 | } | |
828 | ||
3e8f3d6f BT |
829 | /* |
830 | * It's common for several clients to have framebuffer open simultaneously. | |
831 | * e.g. both fbcon and X. Makes things interesting. | |
33077b8d | 832 | * Assumes caller is holding info->lock (for open and release at least) |
3e8f3d6f BT |
833 | */ |
834 | static int dlfb_ops_open(struct fb_info *info, int user) | |
835 | { | |
836 | struct dlfb_data *dev = info->par; | |
837 | ||
d5ed5432 BT |
838 | /* |
839 | * fbcon aggressively connects to first framebuffer it finds, | |
840 | * preventing other clients (X) from working properly. Usually | |
841 | * not what the user wants. Fail by default with option to enable. | |
842 | */ | |
843 | if ((user == 0) & (!console)) | |
844 | return -EBUSY; | |
3e8f3d6f | 845 | |
33077b8d BT |
846 | /* If the USB device is gone, we don't accept new opens */ |
847 | if (dev->virtualized) | |
848 | return -ENODEV; | |
3e8f3d6f BT |
849 | |
850 | dev->fb_count++; | |
851 | ||
33077b8d BT |
852 | kref_get(&dev->kref); |
853 | ||
d5ed5432 | 854 | if (fb_defio && (info->fbdefio == NULL)) { |
5bea1fbf BT |
855 | /* enable defio at last moment if not disabled by client */ |
856 | ||
857 | struct fb_deferred_io *fbdefio; | |
858 | ||
31a9f47a | 859 | fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL); |
5bea1fbf BT |
860 | |
861 | if (fbdefio) { | |
862 | fbdefio->delay = DL_DEFIO_WRITE_DELAY; | |
863 | fbdefio->deferred_io = dlfb_dpy_deferred_io; | |
864 | } | |
865 | ||
866 | info->fbdefio = fbdefio; | |
3e8f3d6f BT |
867 | fb_deferred_io_init(info); |
868 | } | |
3e8f3d6f | 869 | |
81f6f3c1 | 870 | pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n", |
3e8f3d6f BT |
871 | info->node, user, info, dev->fb_count); |
872 | ||
88e58b1a RDI |
873 | return 0; |
874 | } | |
875 | ||
4a4854dd BT |
876 | /* |
877 | * Called when all client interfaces to start transactions have been disabled, | |
878 | * and all references to our device instance (dlfb_data) are released. | |
879 | * Every transaction must have a reference, so we know are fully spun down | |
880 | */ | |
33077b8d | 881 | static void dlfb_free(struct kref *kref) |
4a4854dd BT |
882 | { |
883 | struct dlfb_data *dev = container_of(kref, struct dlfb_data, kref); | |
884 | ||
33077b8d BT |
885 | /* this function will wait for all in-flight urbs to complete */ |
886 | if (dev->urbs.count > 0) | |
887 | dlfb_free_urb_list(dev); | |
888 | ||
4a4854dd BT |
889 | if (dev->backing_buffer) |
890 | vfree(dev->backing_buffer); | |
891 | ||
33077b8d BT |
892 | kfree(dev->edid); |
893 | ||
81f6f3c1 | 894 | pr_warn("freeing dlfb_data %p\n", dev); |
3e8f3d6f | 895 | |
4a4854dd BT |
896 | kfree(dev); |
897 | } | |
898 | ||
5bea1fbf BT |
899 | static void dlfb_release_urb_work(struct work_struct *work) |
900 | { | |
901 | struct urb_node *unode = container_of(work, struct urb_node, | |
902 | release_urb_work.work); | |
903 | ||
904 | up(&unode->dev->urbs.limit_sem); | |
905 | } | |
33077b8d BT |
906 | |
907 | static void dlfb_free_framebuffer_work(struct work_struct *work) | |
2469d5db | 908 | { |
33077b8d BT |
909 | struct dlfb_data *dev = container_of(work, struct dlfb_data, |
910 | free_framebuffer_work.work); | |
911 | struct fb_info *info = dev->info; | |
912 | int node = info->node; | |
913 | ||
914 | unregister_framebuffer(info); | |
2469d5db BT |
915 | |
916 | if (info->cmap.len != 0) | |
917 | fb_dealloc_cmap(&info->cmap); | |
918 | if (info->monspecs.modedb) | |
919 | fb_destroy_modedb(info->monspecs.modedb); | |
920 | if (info->screen_base) | |
921 | vfree(info->screen_base); | |
922 | ||
923 | fb_destroy_modelist(&info->modelist); | |
924 | ||
33077b8d BT |
925 | dev->info = 0; |
926 | ||
927 | /* Assume info structure is freed after this point */ | |
2469d5db BT |
928 | framebuffer_release(info); |
929 | ||
81f6f3c1 | 930 | pr_warn("fb_info for /dev/fb%d has been freed\n", node); |
33077b8d BT |
931 | |
932 | /* ref taken in probe() as part of registering framebfufer */ | |
933 | kref_put(&dev->kref, dlfb_free); | |
934 | } | |
935 | ||
936 | /* | |
937 | * Assumes caller is holding info->lock mutex (for open and release at least) | |
938 | */ | |
939 | static int dlfb_ops_release(struct fb_info *info, int user) | |
940 | { | |
941 | struct dlfb_data *dev = info->par; | |
942 | ||
943 | dev->fb_count--; | |
944 | ||
945 | /* We can't free fb_info here - fbmem will touch it when we return */ | |
946 | if (dev->virtualized && (dev->fb_count == 0)) | |
947 | schedule_delayed_work(&dev->free_framebuffer_work, HZ); | |
948 | ||
33077b8d BT |
949 | if ((dev->fb_count == 0) && (info->fbdefio)) { |
950 | fb_deferred_io_cleanup(info); | |
951 | kfree(info->fbdefio); | |
952 | info->fbdefio = NULL; | |
953 | info->fbops->fb_mmap = dlfb_ops_mmap; | |
954 | } | |
33077b8d | 955 | |
81f6f3c1 | 956 | pr_warn("released /dev/fb%d user=%d count=%d\n", |
33077b8d BT |
957 | info->node, user, dev->fb_count); |
958 | ||
959 | kref_put(&dev->kref, dlfb_free); | |
960 | ||
961 | return 0; | |
2469d5db BT |
962 | } |
963 | ||
7d9485e2 BT |
964 | /* |
965 | * Check whether a video mode is supported by the DisplayLink chip | |
966 | * We start from monitor's modes, so don't need to filter that here | |
967 | */ | |
968 | static int dlfb_is_valid_mode(struct fb_videomode *mode, | |
969 | struct fb_info *info) | |
970 | { | |
971 | struct dlfb_data *dev = info->par; | |
972 | ||
18dffdf8 | 973 | if (mode->xres * mode->yres > dev->sku_pixel_limit) { |
81f6f3c1 | 974 | pr_warn("%dx%d beyond chip capabilities\n", |
18dffdf8 | 975 | mode->xres, mode->yres); |
7d9485e2 | 976 | return 0; |
18dffdf8 BT |
977 | } |
978 | ||
81f6f3c1 | 979 | pr_info("%dx%d valid mode\n", mode->xres, mode->yres); |
7d9485e2 BT |
980 | |
981 | return 1; | |
982 | } | |
983 | ||
984 | static void dlfb_var_color_format(struct fb_var_screeninfo *var) | |
985 | { | |
986 | const struct fb_bitfield red = { 11, 5, 0 }; | |
987 | const struct fb_bitfield green = { 5, 6, 0 }; | |
988 | const struct fb_bitfield blue = { 0, 5, 0 }; | |
989 | ||
990 | var->bits_per_pixel = 16; | |
991 | var->red = red; | |
992 | var->green = green; | |
993 | var->blue = blue; | |
994 | } | |
995 | ||
2469d5db BT |
996 | static int dlfb_ops_check_var(struct fb_var_screeninfo *var, |
997 | struct fb_info *info) | |
998 | { | |
999 | struct fb_videomode mode; | |
1000 | ||
1001 | /* TODO: support dynamically changing framebuffer size */ | |
1002 | if ((var->xres * var->yres * 2) > info->fix.smem_len) | |
1003 | return -EINVAL; | |
1004 | ||
1005 | /* set device-specific elements of var unrelated to mode */ | |
1006 | dlfb_var_color_format(var); | |
1007 | ||
1008 | fb_var_to_videomode(&mode, var); | |
1009 | ||
1010 | if (!dlfb_is_valid_mode(&mode, info)) | |
1011 | return -EINVAL; | |
1012 | ||
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | static int dlfb_ops_set_par(struct fb_info *info) | |
1017 | { | |
1018 | struct dlfb_data *dev = info->par; | |
18dffdf8 BT |
1019 | int result; |
1020 | u16 *pix_framebuffer; | |
1021 | int i; | |
2469d5db | 1022 | |
81f6f3c1 | 1023 | pr_notice("set_par mode %dx%d\n", info->var.xres, info->var.yres); |
2469d5db | 1024 | |
18dffdf8 BT |
1025 | result = dlfb_set_video_mode(dev, &info->var); |
1026 | ||
1027 | if ((result == 0) && (dev->fb_count == 0)) { | |
1028 | ||
1029 | /* paint greenscreen */ | |
1030 | ||
1031 | pix_framebuffer = (u16 *) info->screen_base; | |
1032 | for (i = 0; i < info->fix.smem_len / 2; i++) | |
1033 | pix_framebuffer[i] = 0x37e6; | |
1034 | ||
1035 | dlfb_handle_damage(dev, 0, 0, info->var.xres, info->var.yres, | |
1036 | info->screen_base); | |
1037 | } | |
1038 | ||
1039 | return result; | |
2469d5db BT |
1040 | } |
1041 | ||
9825f70f BT |
1042 | /* |
1043 | * In order to come back from full DPMS off, we need to set the mode again | |
1044 | */ | |
4574203f | 1045 | static int dlfb_ops_blank(int blank_mode, struct fb_info *info) |
f05e0575 | 1046 | { |
530f43a8 | 1047 | struct dlfb_data *dev = info->par; |
7316bc55 | 1048 | |
9825f70f BT |
1049 | if (blank_mode != FB_BLANK_UNBLANK) { |
1050 | char *bufptr; | |
1051 | struct urb *urb; | |
530f43a8 | 1052 | |
9825f70f BT |
1053 | urb = dlfb_get_urb(dev); |
1054 | if (!urb) | |
1055 | return 0; | |
530f43a8 | 1056 | |
9825f70f BT |
1057 | bufptr = (char *) urb->transfer_buffer; |
1058 | bufptr = dlfb_vidreg_lock(bufptr); | |
530f43a8 | 1059 | bufptr = dlfb_enable_hvsync(bufptr, false); |
9825f70f BT |
1060 | bufptr = dlfb_vidreg_unlock(bufptr); |
1061 | ||
1062 | dlfb_submit_urb(dev, urb, bufptr - | |
1063 | (char *) urb->transfer_buffer); | |
7316bc55 | 1064 | } else { |
9825f70f | 1065 | dlfb_set_video_mode(dev, &info->var); |
7316bc55 | 1066 | } |
7316bc55 | 1067 | |
88e58b1a RDI |
1068 | return 0; |
1069 | } | |
1070 | ||
1071 | static struct fb_ops dlfb_ops = { | |
2469d5db | 1072 | .owner = THIS_MODULE, |
1a3e528c | 1073 | .fb_read = fb_sys_read, |
d46ecb9f | 1074 | .fb_write = dlfb_ops_write, |
4574203f BT |
1075 | .fb_setcolreg = dlfb_ops_setcolreg, |
1076 | .fb_fillrect = dlfb_ops_fillrect, | |
1077 | .fb_copyarea = dlfb_ops_copyarea, | |
1078 | .fb_imageblit = dlfb_ops_imageblit, | |
1079 | .fb_mmap = dlfb_ops_mmap, | |
1080 | .fb_ioctl = dlfb_ops_ioctl, | |
3e8f3d6f | 1081 | .fb_open = dlfb_ops_open, |
4574203f BT |
1082 | .fb_release = dlfb_ops_release, |
1083 | .fb_blank = dlfb_ops_blank, | |
2469d5db BT |
1084 | .fb_check_var = dlfb_ops_check_var, |
1085 | .fb_set_par = dlfb_ops_set_par, | |
88e58b1a RDI |
1086 | }; |
1087 | ||
18dffdf8 | 1088 | |
7d9485e2 | 1089 | /* |
18dffdf8 BT |
1090 | * Assumes &info->lock held by caller |
1091 | * Assumes no active clients have framebuffer open | |
1092 | */ | |
1093 | static int dlfb_realloc_framebuffer(struct dlfb_data *dev, struct fb_info *info) | |
1094 | { | |
1095 | int retval = -ENOMEM; | |
1096 | int old_len = info->fix.smem_len; | |
1097 | int new_len; | |
1098 | unsigned char *old_fb = info->screen_base; | |
1099 | unsigned char *new_fb; | |
1100 | unsigned char *new_back; | |
1101 | ||
81f6f3c1 | 1102 | pr_warn("Reallocating framebuffer. Addresses will change!\n"); |
18dffdf8 BT |
1103 | |
1104 | new_len = info->fix.line_length * info->var.yres; | |
1105 | ||
1106 | if (PAGE_ALIGN(new_len) > old_len) { | |
1107 | /* | |
1108 | * Alloc system memory for virtual framebuffer | |
1109 | */ | |
1110 | new_fb = vmalloc(new_len); | |
1111 | if (!new_fb) { | |
81f6f3c1 | 1112 | pr_err("Virtual framebuffer alloc failed\n"); |
18dffdf8 BT |
1113 | goto error; |
1114 | } | |
1115 | ||
1116 | if (info->screen_base) { | |
1117 | memcpy(new_fb, old_fb, old_len); | |
1118 | vfree(info->screen_base); | |
1119 | } | |
1120 | ||
1121 | info->screen_base = new_fb; | |
1122 | info->fix.smem_len = PAGE_ALIGN(new_len); | |
1123 | info->fix.smem_start = (unsigned long) new_fb; | |
1124 | info->flags = udlfb_info_flags; | |
1125 | ||
1126 | /* | |
1127 | * Second framebuffer copy to mirror the framebuffer state | |
1128 | * on the physical USB device. We can function without this. | |
1129 | * But with imperfect damage info we may send pixels over USB | |
1130 | * that were, in fact, unchanged - wasting limited USB bandwidth | |
1131 | */ | |
5b84cc78 | 1132 | new_back = vzalloc(new_len); |
18dffdf8 | 1133 | if (!new_back) |
949f6711 | 1134 | pr_info("No shadow/backing buffer allocated\n"); |
18dffdf8 BT |
1135 | else { |
1136 | if (dev->backing_buffer) | |
1137 | vfree(dev->backing_buffer); | |
1138 | dev->backing_buffer = new_back; | |
18dffdf8 BT |
1139 | } |
1140 | } | |
1141 | ||
1142 | retval = 0; | |
1143 | ||
1144 | error: | |
1145 | return retval; | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * 1) Get EDID from hw, or use sw default | |
1150 | * 2) Parse into various fb_info structs | |
1151 | * 3) Allocate virtual framebuffer memory to back highest res mode | |
1152 | * | |
1153 | * Parses EDID into three places used by various parts of fbdev: | |
7d9485e2 BT |
1154 | * fb_var_screeninfo contains the timing of the monitor's preferred mode |
1155 | * fb_info.monspecs is full parsed EDID info, including monspecs.modedb | |
1156 | * fb_info.modelist is a linked list of all monitor & VESA modes which work | |
1157 | * | |
1158 | * If EDID is not readable/valid, then modelist is all VESA modes, | |
1159 | * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode | |
18dffdf8 | 1160 | * Returns 0 if successful |
7d9485e2 | 1161 | */ |
18dffdf8 BT |
1162 | static int dlfb_setup_modes(struct dlfb_data *dev, |
1163 | struct fb_info *info, | |
1164 | char *default_edid, size_t default_edid_size) | |
7d9485e2 BT |
1165 | { |
1166 | int i; | |
1167 | const struct fb_videomode *default_vmode = NULL; | |
1168 | int result = 0; | |
18dffdf8 BT |
1169 | char *edid; |
1170 | int tries = 3; | |
1171 | ||
1172 | if (info->dev) /* only use mutex if info has been registered */ | |
1173 | mutex_lock(&info->lock); | |
1174 | ||
b9f03a3c | 1175 | edid = kmalloc(EDID_LENGTH, GFP_KERNEL); |
18dffdf8 BT |
1176 | if (!edid) { |
1177 | result = -ENOMEM; | |
1178 | goto error; | |
1179 | } | |
7d9485e2 BT |
1180 | |
1181 | fb_destroy_modelist(&info->modelist); | |
1182 | memset(&info->monspecs, 0, sizeof(info->monspecs)); | |
1183 | ||
18dffdf8 BT |
1184 | /* |
1185 | * Try to (re)read EDID from hardware first | |
1186 | * EDID data may return, but not parse as valid | |
1187 | * Try again a few times, in case of e.g. analog cable noise | |
1188 | */ | |
1189 | while (tries--) { | |
1190 | ||
b9f03a3c | 1191 | i = dlfb_get_edid(dev, edid, EDID_LENGTH); |
18dffdf8 | 1192 | |
b9f03a3c | 1193 | if (i >= EDID_LENGTH) |
18dffdf8 BT |
1194 | fb_edid_to_monspecs(edid, &info->monspecs); |
1195 | ||
1196 | if (info->monspecs.modedb_len > 0) { | |
1197 | dev->edid = edid; | |
1198 | dev->edid_size = i; | |
1199 | break; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | /* If that fails, use a previously returned EDID if available */ | |
1204 | if (info->monspecs.modedb_len == 0) { | |
1205 | ||
81f6f3c1 | 1206 | pr_err("Unable to get valid EDID from device/display\n"); |
18dffdf8 BT |
1207 | |
1208 | if (dev->edid) { | |
1209 | fb_edid_to_monspecs(dev->edid, &info->monspecs); | |
1210 | if (info->monspecs.modedb_len > 0) | |
81f6f3c1 | 1211 | pr_err("Using previously queried EDID\n"); |
18dffdf8 BT |
1212 | } |
1213 | } | |
1214 | ||
1215 | /* If that fails, use the default EDID we were handed */ | |
1216 | if (info->monspecs.modedb_len == 0) { | |
b9f03a3c | 1217 | if (default_edid_size >= EDID_LENGTH) { |
18dffdf8 BT |
1218 | fb_edid_to_monspecs(default_edid, &info->monspecs); |
1219 | if (info->monspecs.modedb_len > 0) { | |
1220 | memcpy(edid, default_edid, default_edid_size); | |
1221 | dev->edid = edid; | |
1222 | dev->edid_size = default_edid_size; | |
81f6f3c1 | 1223 | pr_err("Using default/backup EDID\n"); |
18dffdf8 BT |
1224 | } |
1225 | } | |
1226 | } | |
7d9485e2 | 1227 | |
18dffdf8 | 1228 | /* If we've got modes, let's pick a best default mode */ |
7d9485e2 BT |
1229 | if (info->monspecs.modedb_len > 0) { |
1230 | ||
1231 | for (i = 0; i < info->monspecs.modedb_len; i++) { | |
1232 | if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info)) | |
1233 | fb_add_videomode(&info->monspecs.modedb[i], | |
1234 | &info->modelist); | |
9377c517 WK |
1235 | else { |
1236 | if (i == 0) | |
1237 | /* if we've removed top/best mode */ | |
1238 | info->monspecs.misc | |
1239 | &= ~FB_MISC_1ST_DETAIL; | |
1240 | } | |
7d9485e2 BT |
1241 | } |
1242 | ||
1243 | default_vmode = fb_find_best_display(&info->monspecs, | |
1244 | &info->modelist); | |
18dffdf8 | 1245 | } |
7d9485e2 | 1246 | |
18dffdf8 BT |
1247 | /* If everything else has failed, fall back to safe default mode */ |
1248 | if (default_vmode == NULL) { | |
1249 | ||
1250 | struct fb_videomode fb_vmode = {0}; | |
7d9485e2 BT |
1251 | |
1252 | /* | |
1253 | * Add the standard VESA modes to our modelist | |
1254 | * Since we don't have EDID, there may be modes that | |
1255 | * overspec monitor and/or are incorrect aspect ratio, etc. | |
1256 | * But at least the user has a chance to choose | |
1257 | */ | |
1258 | for (i = 0; i < VESA_MODEDB_SIZE; i++) { | |
1259 | if (dlfb_is_valid_mode((struct fb_videomode *) | |
1260 | &vesa_modes[i], info)) | |
1261 | fb_add_videomode(&vesa_modes[i], | |
1262 | &info->modelist); | |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * default to resolution safe for projectors | |
1267 | * (since they are most common case without EDID) | |
1268 | */ | |
1269 | fb_vmode.xres = 800; | |
1270 | fb_vmode.yres = 600; | |
1271 | fb_vmode.refresh = 60; | |
1272 | default_vmode = fb_find_nearest_mode(&fb_vmode, | |
1273 | &info->modelist); | |
1274 | } | |
1275 | ||
18dffdf8 BT |
1276 | /* If we have good mode and no active clients*/ |
1277 | if ((default_vmode != NULL) && (dev->fb_count == 0)) { | |
1278 | ||
1279 | fb_videomode_to_var(&info->var, default_vmode); | |
1280 | dlfb_var_color_format(&info->var); | |
1281 | ||
1282 | /* | |
1283 | * with mode size info, we can now alloc our framebuffer. | |
1284 | */ | |
1285 | memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix)); | |
1286 | info->fix.line_length = info->var.xres * | |
1287 | (info->var.bits_per_pixel / 8); | |
1288 | ||
1289 | result = dlfb_realloc_framebuffer(dev, info); | |
1290 | ||
1291 | } else | |
1292 | result = -EINVAL; | |
1293 | ||
1294 | error: | |
1295 | if (edid && (dev->edid != edid)) | |
1296 | kfree(edid); | |
1297 | ||
1298 | if (info->dev) | |
1299 | mutex_unlock(&info->lock); | |
7d9485e2 BT |
1300 | |
1301 | return result; | |
1302 | } | |
1303 | ||
1304 | static ssize_t metrics_bytes_rendered_show(struct device *fbdev, | |
1305 | struct device_attribute *a, char *buf) { | |
1306 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1307 | struct dlfb_data *dev = fb_info->par; | |
1308 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1309 | atomic_read(&dev->bytes_rendered)); | |
1310 | } | |
1311 | ||
1312 | static ssize_t metrics_bytes_identical_show(struct device *fbdev, | |
1313 | struct device_attribute *a, char *buf) { | |
1314 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1315 | struct dlfb_data *dev = fb_info->par; | |
1316 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1317 | atomic_read(&dev->bytes_identical)); | |
1318 | } | |
1319 | ||
1320 | static ssize_t metrics_bytes_sent_show(struct device *fbdev, | |
1321 | struct device_attribute *a, char *buf) { | |
1322 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1323 | struct dlfb_data *dev = fb_info->par; | |
1324 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1325 | atomic_read(&dev->bytes_sent)); | |
1326 | } | |
1327 | ||
1328 | static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev, | |
1329 | struct device_attribute *a, char *buf) { | |
1330 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1331 | struct dlfb_data *dev = fb_info->par; | |
1332 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1333 | atomic_read(&dev->cpu_kcycles_used)); | |
1334 | } | |
1335 | ||
18dffdf8 BT |
1336 | static ssize_t edid_show( |
1337 | struct file *filp, | |
1338 | struct kobject *kobj, struct bin_attribute *a, | |
7d9485e2 BT |
1339 | char *buf, loff_t off, size_t count) { |
1340 | struct device *fbdev = container_of(kobj, struct device, kobj); | |
1341 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1342 | struct dlfb_data *dev = fb_info->par; | |
7d9485e2 | 1343 | |
18dffdf8 | 1344 | if (dev->edid == NULL) |
7d9485e2 BT |
1345 | return 0; |
1346 | ||
18dffdf8 | 1347 | if ((off >= dev->edid_size) || (count > dev->edid_size)) |
7d9485e2 BT |
1348 | return 0; |
1349 | ||
18dffdf8 BT |
1350 | if (off + count > dev->edid_size) |
1351 | count = dev->edid_size - off; | |
1352 | ||
81f6f3c1 | 1353 | pr_info("sysfs edid copy %p to %p, %d bytes\n", |
18dffdf8 BT |
1354 | dev->edid, buf, (int) count); |
1355 | ||
1356 | memcpy(buf, dev->edid, count); | |
7d9485e2 BT |
1357 | |
1358 | return count; | |
1359 | } | |
1360 | ||
8ef8cc4f BT |
1361 | static ssize_t edid_store( |
1362 | struct file *filp, | |
1363 | struct kobject *kobj, struct bin_attribute *a, | |
1364 | char *src, loff_t src_off, size_t src_size) { | |
1365 | struct device *fbdev = container_of(kobj, struct device, kobj); | |
1366 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1367 | struct dlfb_data *dev = fb_info->par; | |
1368 | ||
1369 | /* We only support write of entire EDID at once, no offset*/ | |
b9f03a3c | 1370 | if ((src_size != EDID_LENGTH) || (src_off != 0)) |
8ef8cc4f BT |
1371 | return 0; |
1372 | ||
1373 | dlfb_setup_modes(dev, fb_info, src, src_size); | |
1374 | ||
1375 | if (dev->edid && (memcmp(src, dev->edid, src_size) == 0)) { | |
81f6f3c1 | 1376 | pr_info("sysfs written EDID is new default\n"); |
8ef8cc4f BT |
1377 | dlfb_ops_set_par(fb_info); |
1378 | return src_size; | |
1379 | } else | |
1380 | return 0; | |
1381 | } | |
7d9485e2 BT |
1382 | |
1383 | static ssize_t metrics_reset_store(struct device *fbdev, | |
1384 | struct device_attribute *attr, | |
1385 | const char *buf, size_t count) | |
1386 | { | |
1387 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1388 | struct dlfb_data *dev = fb_info->par; | |
1389 | ||
1390 | atomic_set(&dev->bytes_rendered, 0); | |
1391 | atomic_set(&dev->bytes_identical, 0); | |
1392 | atomic_set(&dev->bytes_sent, 0); | |
1393 | atomic_set(&dev->cpu_kcycles_used, 0); | |
7d9485e2 BT |
1394 | |
1395 | return count; | |
1396 | } | |
1397 | ||
7d9485e2 BT |
1398 | static struct bin_attribute edid_attr = { |
1399 | .attr.name = "edid", | |
8ef8cc4f | 1400 | .attr.mode = 0666, |
b9f03a3c | 1401 | .size = EDID_LENGTH, |
7d9485e2 | 1402 | .read = edid_show, |
8ef8cc4f | 1403 | .write = edid_store |
7d9485e2 BT |
1404 | }; |
1405 | ||
1406 | static struct device_attribute fb_device_attrs[] = { | |
1407 | __ATTR_RO(metrics_bytes_rendered), | |
1408 | __ATTR_RO(metrics_bytes_identical), | |
1409 | __ATTR_RO(metrics_bytes_sent), | |
1410 | __ATTR_RO(metrics_cpu_kcycles_used), | |
926c1115 | 1411 | __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store), |
7d9485e2 BT |
1412 | }; |
1413 | ||
cc403dc6 BT |
1414 | /* |
1415 | * This is necessary before we can communicate with the display controller. | |
1416 | */ | |
1417 | static int dlfb_select_std_channel(struct dlfb_data *dev) | |
1418 | { | |
1419 | int ret; | |
1420 | u8 set_def_chn[] = { 0x57, 0xCD, 0xDC, 0xA7, | |
1421 | 0x1C, 0x88, 0x5E, 0x15, | |
1422 | 0x60, 0xFE, 0xC6, 0x97, | |
1423 | 0x16, 0x3D, 0x47, 0xF2 }; | |
1424 | ||
1425 | ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
1426 | NR_USB_REQUEST_CHANNEL, | |
1427 | (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, | |
1428 | set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT); | |
1429 | return ret; | |
1430 | } | |
1431 | ||
18dffdf8 BT |
1432 | static int dlfb_parse_vendor_descriptor(struct dlfb_data *dev, |
1433 | struct usb_device *usbdev) | |
1434 | { | |
1435 | char *desc; | |
1436 | char *buf; | |
1437 | char *desc_end; | |
1438 | ||
1439 | u8 total_len = 0; | |
1440 | ||
1441 | buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); | |
1442 | if (!buf) | |
1443 | return false; | |
1444 | desc = buf; | |
1445 | ||
1446 | total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */ | |
1447 | 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); | |
1448 | if (total_len > 5) { | |
81f6f3c1 | 1449 | pr_info("vendor descriptor length:%x data:%02x %02x %02x %02x" \ |
18dffdf8 BT |
1450 | "%02x %02x %02x %02x %02x %02x %02x\n", |
1451 | total_len, desc[0], | |
1452 | desc[1], desc[2], desc[3], desc[4], desc[5], desc[6], | |
1453 | desc[7], desc[8], desc[9], desc[10]); | |
1454 | ||
1455 | if ((desc[0] != total_len) || /* descriptor length */ | |
1456 | (desc[1] != 0x5f) || /* vendor descriptor type */ | |
1457 | (desc[2] != 0x01) || /* version (2 bytes) */ | |
1458 | (desc[3] != 0x00) || | |
1459 | (desc[4] != total_len - 2)) /* length after type */ | |
1460 | goto unrecognized; | |
1461 | ||
1462 | desc_end = desc + total_len; | |
1463 | desc += 5; /* the fixed header we've already parsed */ | |
1464 | ||
1465 | while (desc < desc_end) { | |
1466 | u8 length; | |
1467 | u16 key; | |
1468 | ||
1469 | key = *((u16 *) desc); | |
1470 | desc += sizeof(u16); | |
1471 | length = *desc; | |
1472 | desc++; | |
1473 | ||
1474 | switch (key) { | |
1475 | case 0x0200: { /* max_area */ | |
1476 | u32 max_area; | |
1477 | max_area = le32_to_cpu(*((u32 *)desc)); | |
81f6f3c1 | 1478 | pr_warn("DL chip limited to %d pixel modes\n", |
18dffdf8 BT |
1479 | max_area); |
1480 | dev->sku_pixel_limit = max_area; | |
1481 | break; | |
1482 | } | |
1483 | default: | |
1484 | break; | |
1485 | } | |
1486 | desc += length; | |
1487 | } | |
1488 | } | |
1489 | ||
1490 | goto success; | |
2469d5db | 1491 | |
18dffdf8 BT |
1492 | unrecognized: |
1493 | /* allow udlfb to load for now even if firmware unrecognized */ | |
81f6f3c1 | 1494 | pr_err("Unrecognized vendor firmware descriptor\n"); |
18dffdf8 BT |
1495 | |
1496 | success: | |
1497 | kfree(buf); | |
1498 | return true; | |
1499 | } | |
2469d5db | 1500 | static int dlfb_usb_probe(struct usb_interface *interface, |
59277b67 | 1501 | const struct usb_device_id *id) |
88e58b1a | 1502 | { |
59277b67 | 1503 | struct usb_device *usbdev; |
18dffdf8 | 1504 | struct dlfb_data *dev = 0; |
33077b8d | 1505 | struct fb_info *info = 0; |
59277b67 | 1506 | int retval = -ENOMEM; |
2685cffa | 1507 | int i; |
59277b67 | 1508 | |
2469d5db BT |
1509 | /* usb initialization */ |
1510 | ||
1511 | usbdev = interface_to_usbdev(interface); | |
59277b67 BT |
1512 | |
1513 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1514 | if (dev == NULL) { | |
2469d5db BT |
1515 | err("dlfb_usb_probe: failed alloc of dev struct\n"); |
1516 | goto error; | |
88e58b1a | 1517 | } |
88e58b1a | 1518 | |
2469d5db BT |
1519 | /* we need to wait for both usb and fbdev to spin down on disconnect */ |
1520 | kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */ | |
18dffdf8 | 1521 | kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */ |
2469d5db | 1522 | |
59277b67 | 1523 | dev->udev = usbdev; |
4a4854dd | 1524 | dev->gdev = &usbdev->dev; /* our generic struct device * */ |
59277b67 BT |
1525 | usb_set_intfdata(interface, dev); |
1526 | ||
81f6f3c1 | 1527 | pr_info("%s %s - serial #%s\n", |
18dffdf8 | 1528 | usbdev->manufacturer, usbdev->product, usbdev->serial); |
81f6f3c1 | 1529 | pr_info("vid_%04x&pid_%04x&rev_%04x driver's dlfb_data struct at %p\n", |
18dffdf8 BT |
1530 | usbdev->descriptor.idVendor, usbdev->descriptor.idProduct, |
1531 | usbdev->descriptor.bcdDevice, dev); | |
81f6f3c1 PM |
1532 | pr_info("console enable=%d\n", console); |
1533 | pr_info("fb_defio enable=%d\n", fb_defio); | |
18dffdf8 BT |
1534 | |
1535 | dev->sku_pixel_limit = 2048 * 1152; /* default to maximum */ | |
1536 | ||
1537 | if (!dlfb_parse_vendor_descriptor(dev, usbdev)) { | |
81f6f3c1 | 1538 | pr_err("firmware not recognized. Assume incompatible device\n"); |
18dffdf8 BT |
1539 | goto error; |
1540 | } | |
1541 | ||
2469d5db BT |
1542 | if (!dlfb_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) { |
1543 | retval = -ENOMEM; | |
81f6f3c1 | 1544 | pr_err("dlfb_alloc_urb_list failed\n"); |
2469d5db BT |
1545 | goto error; |
1546 | } | |
1547 | ||
2469d5db | 1548 | /* We don't register a new USB class. Our client interface is fbdev */ |
59277b67 | 1549 | |
2469d5db BT |
1550 | /* allocates framebuffer driver structure, not framebuffer memory */ |
1551 | info = framebuffer_alloc(0, &usbdev->dev); | |
1552 | if (!info) { | |
1553 | retval = -ENOMEM; | |
81f6f3c1 | 1554 | pr_err("framebuffer_alloc failed\n"); |
2469d5db BT |
1555 | goto error; |
1556 | } | |
33077b8d | 1557 | |
59277b67 BT |
1558 | dev->info = info; |
1559 | info->par = dev; | |
1560 | info->pseudo_palette = dev->pseudo_palette; | |
2469d5db | 1561 | info->fbops = &dlfb_ops; |
59277b67 | 1562 | |
2469d5db BT |
1563 | retval = fb_alloc_cmap(&info->cmap, 256, 0); |
1564 | if (retval < 0) { | |
81f6f3c1 | 1565 | pr_err("fb_alloc_cmap failed %x\n", retval); |
2469d5db BT |
1566 | goto error; |
1567 | } | |
88e58b1a | 1568 | |
33077b8d BT |
1569 | INIT_DELAYED_WORK(&dev->free_framebuffer_work, |
1570 | dlfb_free_framebuffer_work); | |
1571 | ||
18dffdf8 BT |
1572 | INIT_LIST_HEAD(&info->modelist); |
1573 | ||
1574 | retval = dlfb_setup_modes(dev, info, NULL, 0); | |
1575 | if (retval != 0) { | |
81f6f3c1 | 1576 | pr_err("unable to find common mode for display and adapter\n"); |
18dffdf8 BT |
1577 | goto error; |
1578 | } | |
1579 | ||
2469d5db | 1580 | /* ready to begin using device */ |
88e58b1a | 1581 | |
2469d5db BT |
1582 | atomic_set(&dev->usb_active, 1); |
1583 | dlfb_select_std_channel(dev); | |
88e58b1a | 1584 | |
18dffdf8 | 1585 | dlfb_ops_check_var(&info->var, info); |
2469d5db | 1586 | dlfb_ops_set_par(info); |
88e58b1a | 1587 | |
2469d5db | 1588 | retval = register_framebuffer(info); |
59277b67 | 1589 | if (retval < 0) { |
81f6f3c1 | 1590 | pr_err("register_framebuffer failed %d\n", retval); |
2469d5db | 1591 | goto error; |
7316bc55 | 1592 | } |
88e58b1a | 1593 | |
94cd1ae2 LY |
1594 | for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) { |
1595 | retval = device_create_file(info->dev, &fb_device_attrs[i]); | |
1596 | if (retval) { | |
1597 | pr_err("device_create_file failed %d\n", retval); | |
1598 | goto err_del_attrs; | |
1599 | } | |
1600 | } | |
88e58b1a | 1601 | |
94cd1ae2 LY |
1602 | retval = device_create_bin_file(info->dev, &edid_attr); |
1603 | if (retval) { | |
1604 | pr_err("device_create_bin_file failed %d\n", retval); | |
1605 | goto err_del_attrs; | |
1606 | } | |
88e58b1a | 1607 | |
81f6f3c1 | 1608 | pr_info("DisplayLink USB device /dev/fb%d attached. %dx%d resolution." |
2469d5db | 1609 | " Using %dK framebuffer memory\n", info->node, |
18dffdf8 | 1610 | info->var.xres, info->var.yres, |
2469d5db | 1611 | ((dev->backing_buffer) ? |
18dffdf8 | 1612 | info->fix.smem_len * 2 : info->fix.smem_len) >> 10); |
88e58b1a RDI |
1613 | return 0; |
1614 | ||
94cd1ae2 LY |
1615 | err_del_attrs: |
1616 | for (i -= 1; i >= 0; i--) | |
1617 | device_remove_file(info->dev, &fb_device_attrs[i]); | |
1618 | ||
2469d5db BT |
1619 | error: |
1620 | if (dev) { | |
2469d5db | 1621 | |
33077b8d BT |
1622 | if (info) { |
1623 | if (info->cmap.len != 0) | |
1624 | fb_dealloc_cmap(&info->cmap); | |
1625 | if (info->monspecs.modedb) | |
1626 | fb_destroy_modedb(info->monspecs.modedb); | |
1627 | if (info->screen_base) | |
1628 | vfree(info->screen_base); | |
1629 | ||
1630 | fb_destroy_modelist(&info->modelist); | |
1631 | ||
1632 | framebuffer_release(info); | |
1633 | } | |
1634 | ||
1635 | if (dev->backing_buffer) | |
1636 | vfree(dev->backing_buffer); | |
1637 | ||
1638 | kref_put(&dev->kref, dlfb_free); /* ref for framebuffer */ | |
1639 | kref_put(&dev->kref, dlfb_free); /* last ref from kref_init */ | |
2469d5db BT |
1640 | |
1641 | /* dev has been deallocated. Do not dereference */ | |
1642 | } | |
1643 | ||
59277b67 | 1644 | return retval; |
88e58b1a RDI |
1645 | } |
1646 | ||
2469d5db | 1647 | static void dlfb_usb_disconnect(struct usb_interface *interface) |
88e58b1a | 1648 | { |
59277b67 BT |
1649 | struct dlfb_data *dev; |
1650 | struct fb_info *info; | |
2469d5db | 1651 | int i; |
88e58b1a | 1652 | |
59277b67 | 1653 | dev = usb_get_intfdata(interface); |
2469d5db BT |
1654 | info = dev->info; |
1655 | ||
81f6f3c1 | 1656 | pr_info("USB disconnect starting\n"); |
2469d5db | 1657 | |
33077b8d BT |
1658 | /* we virtualize until all fb clients release. Then we free */ |
1659 | dev->virtualized = true; | |
1660 | ||
1661 | /* When non-active we'll update virtual framebuffer, but no new urbs */ | |
1662 | atomic_set(&dev->usb_active, 0); | |
59277b67 | 1663 | |
33077b8d | 1664 | /* remove udlfb's sysfs interfaces */ |
2469d5db BT |
1665 | for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) |
1666 | device_remove_file(info->dev, &fb_device_attrs[i]); | |
2469d5db BT |
1667 | device_remove_bin_file(info->dev, &edid_attr); |
1668 | ||
33077b8d | 1669 | usb_set_intfdata(interface, NULL); |
59277b67 | 1670 | |
33077b8d BT |
1671 | /* if clients still have us open, will be freed on last close */ |
1672 | if (dev->fb_count == 0) | |
1673 | schedule_delayed_work(&dev->free_framebuffer_work, 0); | |
88e58b1a | 1674 | |
2469d5db | 1675 | /* release reference taken by kref_init in probe() */ |
33077b8d | 1676 | kref_put(&dev->kref, dlfb_free); |
88e58b1a | 1677 | |
2469d5db BT |
1678 | /* consider dlfb_data freed */ |
1679 | ||
1680 | return; | |
88e58b1a RDI |
1681 | } |
1682 | ||
1683 | static struct usb_driver dlfb_driver = { | |
1684 | .name = "udlfb", | |
2469d5db BT |
1685 | .probe = dlfb_usb_probe, |
1686 | .disconnect = dlfb_usb_disconnect, | |
88e58b1a RDI |
1687 | .id_table = id_table, |
1688 | }; | |
1689 | ||
2469d5db | 1690 | static int __init dlfb_module_init(void) |
88e58b1a RDI |
1691 | { |
1692 | int res; | |
1693 | ||
88e58b1a RDI |
1694 | res = usb_register(&dlfb_driver); |
1695 | if (res) | |
1696 | err("usb_register failed. Error number %d", res); | |
1697 | ||
88e58b1a RDI |
1698 | return res; |
1699 | } | |
1700 | ||
2469d5db | 1701 | static void __exit dlfb_module_exit(void) |
88e58b1a RDI |
1702 | { |
1703 | usb_deregister(&dlfb_driver); | |
1704 | } | |
1705 | ||
2469d5db BT |
1706 | module_init(dlfb_module_init); |
1707 | module_exit(dlfb_module_exit); | |
88e58b1a | 1708 | |
4a4854dd BT |
1709 | static void dlfb_urb_completion(struct urb *urb) |
1710 | { | |
1711 | struct urb_node *unode = urb->context; | |
1712 | struct dlfb_data *dev = unode->dev; | |
1713 | unsigned long flags; | |
1714 | ||
1715 | /* sync/async unlink faults aren't errors */ | |
1716 | if (urb->status) { | |
1717 | if (!(urb->status == -ENOENT || | |
1718 | urb->status == -ECONNRESET || | |
1719 | urb->status == -ESHUTDOWN)) { | |
81f6f3c1 | 1720 | pr_err("%s - nonzero write bulk status received: %d\n", |
4a4854dd BT |
1721 | __func__, urb->status); |
1722 | atomic_set(&dev->lost_pixels, 1); | |
1723 | } | |
1724 | } | |
1725 | ||
1726 | urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */ | |
1727 | ||
1728 | spin_lock_irqsave(&dev->urbs.lock, flags); | |
1729 | list_add_tail(&unode->entry, &dev->urbs.list); | |
1730 | dev->urbs.available++; | |
1731 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1732 | ||
5bea1fbf BT |
1733 | /* |
1734 | * When using fb_defio, we deadlock if up() is called | |
1735 | * while another is waiting. So queue to another process. | |
1736 | */ | |
1737 | if (fb_defio) | |
1738 | schedule_delayed_work(&unode->release_urb_work, 0); | |
1739 | else | |
1740 | up(&dev->urbs.limit_sem); | |
4a4854dd BT |
1741 | } |
1742 | ||
1743 | static void dlfb_free_urb_list(struct dlfb_data *dev) | |
1744 | { | |
1745 | int count = dev->urbs.count; | |
1746 | struct list_head *node; | |
1747 | struct urb_node *unode; | |
1748 | struct urb *urb; | |
1749 | int ret; | |
1750 | unsigned long flags; | |
1751 | ||
81f6f3c1 | 1752 | pr_notice("Waiting for completes and freeing all render urbs\n"); |
4a4854dd BT |
1753 | |
1754 | /* keep waiting and freeing, until we've got 'em all */ | |
1755 | while (count--) { | |
33077b8d BT |
1756 | |
1757 | /* Getting interrupted means a leak, but ok at shutdown*/ | |
1758 | ret = down_interruptible(&dev->urbs.limit_sem); | |
1759 | if (ret) | |
4a4854dd | 1760 | break; |
33077b8d | 1761 | |
4a4854dd BT |
1762 | spin_lock_irqsave(&dev->urbs.lock, flags); |
1763 | ||
1764 | node = dev->urbs.list.next; /* have reserved one with sem */ | |
1765 | list_del_init(node); | |
1766 | ||
1767 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1768 | ||
1769 | unode = list_entry(node, struct urb_node, entry); | |
1770 | urb = unode->urb; | |
1771 | ||
1772 | /* Free each separately allocated piece */ | |
c220cc3e GKH |
1773 | usb_free_coherent(urb->dev, dev->urbs.size, |
1774 | urb->transfer_buffer, urb->transfer_dma); | |
4a4854dd BT |
1775 | usb_free_urb(urb); |
1776 | kfree(node); | |
1777 | } | |
1778 | ||
4a4854dd BT |
1779 | } |
1780 | ||
1781 | static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size) | |
1782 | { | |
1783 | int i = 0; | |
1784 | struct urb *urb; | |
1785 | struct urb_node *unode; | |
1786 | char *buf; | |
1787 | ||
1788 | spin_lock_init(&dev->urbs.lock); | |
1789 | ||
1790 | dev->urbs.size = size; | |
1791 | INIT_LIST_HEAD(&dev->urbs.list); | |
1792 | ||
1793 | while (i < count) { | |
1794 | unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL); | |
1795 | if (!unode) | |
1796 | break; | |
1797 | unode->dev = dev; | |
1798 | ||
5bea1fbf BT |
1799 | INIT_DELAYED_WORK(&unode->release_urb_work, |
1800 | dlfb_release_urb_work); | |
1801 | ||
4a4854dd BT |
1802 | urb = usb_alloc_urb(0, GFP_KERNEL); |
1803 | if (!urb) { | |
1804 | kfree(unode); | |
1805 | break; | |
1806 | } | |
1807 | unode->urb = urb; | |
1808 | ||
c220cc3e GKH |
1809 | buf = usb_alloc_coherent(dev->udev, MAX_TRANSFER, GFP_KERNEL, |
1810 | &urb->transfer_dma); | |
4a4854dd BT |
1811 | if (!buf) { |
1812 | kfree(unode); | |
1813 | usb_free_urb(urb); | |
1814 | break; | |
1815 | } | |
1816 | ||
1817 | /* urb->transfer_buffer_length set to actual before submit */ | |
1818 | usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1), | |
1819 | buf, size, dlfb_urb_completion, unode); | |
1820 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
1821 | ||
1822 | list_add_tail(&unode->entry, &dev->urbs.list); | |
1823 | ||
1824 | i++; | |
1825 | } | |
1826 | ||
1827 | sema_init(&dev->urbs.limit_sem, i); | |
1828 | dev->urbs.count = i; | |
1829 | dev->urbs.available = i; | |
1830 | ||
81f6f3c1 | 1831 | pr_notice("allocated %d %d byte urbs\n", i, (int) size); |
4a4854dd BT |
1832 | |
1833 | return i; | |
1834 | } | |
1835 | ||
1836 | static struct urb *dlfb_get_urb(struct dlfb_data *dev) | |
1837 | { | |
1838 | int ret = 0; | |
1839 | struct list_head *entry; | |
1840 | struct urb_node *unode; | |
1841 | struct urb *urb = NULL; | |
1842 | unsigned long flags; | |
1843 | ||
1844 | /* Wait for an in-flight buffer to complete and get re-queued */ | |
1845 | ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT); | |
1846 | if (ret) { | |
1847 | atomic_set(&dev->lost_pixels, 1); | |
81f6f3c1 | 1848 | pr_warn("wait for urb interrupted: %x available: %d\n", |
5bea1fbf | 1849 | ret, dev->urbs.available); |
4a4854dd BT |
1850 | goto error; |
1851 | } | |
1852 | ||
1853 | spin_lock_irqsave(&dev->urbs.lock, flags); | |
1854 | ||
1855 | BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */ | |
1856 | entry = dev->urbs.list.next; | |
1857 | list_del_init(entry); | |
1858 | dev->urbs.available--; | |
1859 | ||
1860 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1861 | ||
1862 | unode = list_entry(entry, struct urb_node, entry); | |
1863 | urb = unode->urb; | |
1864 | ||
1865 | error: | |
1866 | return urb; | |
1867 | } | |
1868 | ||
1869 | static int dlfb_submit_urb(struct dlfb_data *dev, struct urb *urb, size_t len) | |
1870 | { | |
1871 | int ret; | |
1872 | ||
1873 | BUG_ON(len > dev->urbs.size); | |
1874 | ||
1875 | urb->transfer_buffer_length = len; /* set to actual payload len */ | |
1876 | ret = usb_submit_urb(urb, GFP_KERNEL); | |
1877 | if (ret) { | |
1878 | dlfb_urb_completion(urb); /* because no one else will */ | |
1879 | atomic_set(&dev->lost_pixels, 1); | |
81f6f3c1 | 1880 | pr_err("usb_submit_urb error %x\n", ret); |
4a4854dd BT |
1881 | } |
1882 | return ret; | |
1883 | } | |
1884 | ||
d5ed5432 BT |
1885 | module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); |
1886 | MODULE_PARM_DESC(console, "Allow fbcon to consume first framebuffer found"); | |
1887 | ||
1888 | module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); | |
1889 | MODULE_PARM_DESC(fb_defio, "Enable fb_defio mmap support. *Experimental*"); | |
1890 | ||
59277b67 | 1891 | MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, " |
2469d5db BT |
1892 | "Jaya Kumar <jayakumar.lkml@gmail.com>, " |
1893 | "Bernie Thompson <bernie@plugable.com>"); | |
1894 | MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); | |
88e58b1a | 1895 | MODULE_LICENSE("GPL"); |
2469d5db | 1896 |