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 | 50 | /* |
b63d1013 BT |
51 | * There are many DisplayLink-based graphics products, all with unique PIDs. |
52 | * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) | |
53 | * We also require a match on SubClass (0x00) and Protocol (0x00), | |
54 | * which is compatible with all known USB 2.0 era graphics chips and firmware, | |
55 | * but allows DisplayLink to increment those for any future incompatible chips | |
cc403dc6 BT |
56 | */ |
57 | static struct usb_device_id id_table[] = { | |
b63d1013 BT |
58 | {.idVendor = 0x17e9, |
59 | .bInterfaceClass = 0xff, | |
60 | .bInterfaceSubClass = 0x00, | |
61 | .bInterfaceProtocol = 0x00, | |
62 | .match_flags = USB_DEVICE_ID_MATCH_VENDOR | | |
63 | USB_DEVICE_ID_MATCH_INT_CLASS | | |
64 | USB_DEVICE_ID_MATCH_INT_SUBCLASS | | |
65 | USB_DEVICE_ID_MATCH_INT_PROTOCOL, | |
66 | }, | |
cc403dc6 BT |
67 | {}, |
68 | }; | |
69 | MODULE_DEVICE_TABLE(usb, id_table); | |
88e58b1a | 70 | |
d5ed5432 | 71 | /* module options */ |
90ab5ee9 RR |
72 | static bool console = 1; /* Allow fbcon to open framebuffer */ |
73 | static bool fb_defio = 1; /* Detect mmap writes using page faults */ | |
74 | static bool shadow = 1; /* Optionally disable shadow framebuffer */ | |
664c5f18 | 75 | static int pixel_limit; /* Optionally force a pixel resolution limit */ |
dd8015f1 | 76 | |
4a4854dd BT |
77 | /* dlfb keeps a list of urbs for efficient bulk transfers */ |
78 | static void dlfb_urb_completion(struct urb *urb); | |
79 | static struct urb *dlfb_get_urb(struct dlfb_data *dev); | |
80 | static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len); | |
81 | static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size); | |
82 | static void dlfb_free_urb_list(struct dlfb_data *dev); | |
83 | ||
59277b67 | 84 | /* |
bd80816b BT |
85 | * All DisplayLink bulk operations start with 0xAF, followed by specific code |
86 | * All operations are written to buffers which then later get sent to device | |
59277b67 | 87 | */ |
4574203f | 88 | static char *dlfb_set_register(char *buf, u8 reg, u8 val) |
88e58b1a | 89 | { |
1d31a9ee BT |
90 | *buf++ = 0xAF; |
91 | *buf++ = 0x20; | |
92 | *buf++ = reg; | |
93 | *buf++ = val; | |
94 | return buf; | |
59277b67 | 95 | } |
88e58b1a | 96 | |
4574203f | 97 | static char *dlfb_vidreg_lock(char *buf) |
59277b67 | 98 | { |
4574203f | 99 | return dlfb_set_register(buf, 0xFF, 0x00); |
59277b67 | 100 | } |
88e58b1a | 101 | |
4574203f | 102 | static char *dlfb_vidreg_unlock(char *buf) |
59277b67 | 103 | { |
4574203f | 104 | return dlfb_set_register(buf, 0xFF, 0xFF); |
59277b67 BT |
105 | } |
106 | ||
107 | /* | |
58e7c3b0 BT |
108 | * Map FB_BLANK_* to DisplayLink register |
109 | * DLReg FB_BLANK_* | |
110 | * ----- ----------------------------- | |
111 | * 0x00 FB_BLANK_UNBLANK (0) | |
112 | * 0x01 FB_BLANK (1) | |
113 | * 0x03 FB_BLANK_VSYNC_SUSPEND (2) | |
114 | * 0x05 FB_BLANK_HSYNC_SUSPEND (3) | |
115 | * 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back | |
59277b67 | 116 | */ |
58e7c3b0 | 117 | static char *dlfb_blanking(char *buf, int fb_blank) |
59277b67 | 118 | { |
58e7c3b0 BT |
119 | u8 reg; |
120 | ||
121 | switch (fb_blank) { | |
122 | case FB_BLANK_POWERDOWN: | |
123 | reg = 0x07; | |
124 | break; | |
125 | case FB_BLANK_HSYNC_SUSPEND: | |
126 | reg = 0x05; | |
127 | break; | |
128 | case FB_BLANK_VSYNC_SUSPEND: | |
129 | reg = 0x03; | |
130 | break; | |
131 | case FB_BLANK_NORMAL: | |
132 | reg = 0x01; | |
133 | break; | |
134 | default: | |
135 | reg = 0x00; | |
136 | } | |
137 | ||
138 | buf = dlfb_set_register(buf, 0x1F, reg); | |
139 | ||
140 | return buf; | |
59277b67 BT |
141 | } |
142 | ||
4574203f | 143 | static char *dlfb_set_color_depth(char *buf, u8 selection) |
59277b67 | 144 | { |
4574203f | 145 | return dlfb_set_register(buf, 0x00, selection); |
59277b67 BT |
146 | } |
147 | ||
4574203f | 148 | static char *dlfb_set_base16bpp(char *wrptr, u32 base) |
59277b67 | 149 | { |
1d31a9ee | 150 | /* the base pointer is 16 bits wide, 0x20 is hi byte. */ |
4574203f BT |
151 | wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); |
152 | wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); | |
153 | return dlfb_set_register(wrptr, 0x22, base); | |
59277b67 BT |
154 | } |
155 | ||
bd80816b BT |
156 | /* |
157 | * DisplayLink HW has separate 16bpp and 8bpp framebuffers. | |
158 | * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer | |
159 | */ | |
4574203f | 160 | static char *dlfb_set_base8bpp(char *wrptr, u32 base) |
59277b67 | 161 | { |
4574203f BT |
162 | wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); |
163 | wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); | |
164 | return dlfb_set_register(wrptr, 0x28, base); | |
59277b67 BT |
165 | } |
166 | ||
4574203f | 167 | static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) |
59277b67 | 168 | { |
4574203f BT |
169 | wrptr = dlfb_set_register(wrptr, reg, value >> 8); |
170 | return dlfb_set_register(wrptr, reg+1, value); | |
59277b67 BT |
171 | } |
172 | ||
173 | /* | |
174 | * This is kind of weird because the controller takes some | |
175 | * register values in a different byte order than other registers. | |
176 | */ | |
4574203f | 177 | static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) |
59277b67 | 178 | { |
4574203f BT |
179 | wrptr = dlfb_set_register(wrptr, reg, value); |
180 | return dlfb_set_register(wrptr, reg+1, value >> 8); | |
59277b67 BT |
181 | } |
182 | ||
183 | /* | |
184 | * LFSR is linear feedback shift register. The reason we have this is | |
185 | * because the display controller needs to minimize the clock depth of | |
186 | * various counters used in the display path. So this code reverses the | |
187 | * provided value into the lfsr16 value by counting backwards to get | |
188 | * the value that needs to be set in the hardware comparator to get the | |
189 | * same actual count. This makes sense once you read above a couple of | |
190 | * times and think about it from a hardware perspective. | |
191 | */ | |
bd80816b | 192 | static u16 dlfb_lfsr16(u16 actual_count) |
59277b67 BT |
193 | { |
194 | u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ | |
195 | ||
196 | while (actual_count--) { | |
197 | lv = ((lv << 1) | | |
198 | (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) | |
199 | & 0xFFFF; | |
88e58b1a RDI |
200 | } |
201 | ||
59277b67 BT |
202 | return (u16) lv; |
203 | } | |
204 | ||
205 | /* | |
206 | * This does LFSR conversion on the value that is to be written. | |
207 | * See LFSR explanation above for more detail. | |
208 | */ | |
4574203f | 209 | static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) |
59277b67 | 210 | { |
bd80816b | 211 | return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); |
88e58b1a RDI |
212 | } |
213 | ||
59277b67 BT |
214 | /* |
215 | * This takes a standard fbdev screeninfo struct and all of its monitor mode | |
216 | * details and converts them into the DisplayLink equivalent register commands. | |
217 | */ | |
4574203f | 218 | static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) |
88e58b1a | 219 | { |
59277b67 BT |
220 | u16 xds, yds; |
221 | u16 xde, yde; | |
222 | u16 yec; | |
223 | ||
59277b67 BT |
224 | /* x display start */ |
225 | xds = var->left_margin + var->hsync_len; | |
4574203f | 226 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); |
59277b67 BT |
227 | /* x display end */ |
228 | xde = xds + var->xres; | |
4574203f | 229 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); |
59277b67 BT |
230 | |
231 | /* y display start */ | |
232 | yds = var->upper_margin + var->vsync_len; | |
4574203f | 233 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); |
59277b67 BT |
234 | /* y display end */ |
235 | yde = yds + var->yres; | |
4574203f | 236 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); |
59277b67 BT |
237 | |
238 | /* x end count is active + blanking - 1 */ | |
4574203f BT |
239 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, |
240 | xde + var->right_margin - 1); | |
59277b67 BT |
241 | |
242 | /* libdlo hardcodes hsync start to 1 */ | |
4574203f | 243 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); |
59277b67 BT |
244 | |
245 | /* hsync end is width of sync pulse + 1 */ | |
4574203f | 246 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); |
59277b67 BT |
247 | |
248 | /* hpixels is active pixels */ | |
4574203f | 249 | wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); |
88e58b1a | 250 | |
59277b67 BT |
251 | /* yendcount is vertical active + vertical blanking */ |
252 | yec = var->yres + var->upper_margin + var->lower_margin + | |
253 | var->vsync_len; | |
4574203f | 254 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); |
88e58b1a | 255 | |
59277b67 | 256 | /* libdlo hardcodes vsync start to 0 */ |
4574203f | 257 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); |
59277b67 BT |
258 | |
259 | /* vsync end is width of vsync pulse */ | |
4574203f | 260 | wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); |
59277b67 BT |
261 | |
262 | /* vpixels is active pixels */ | |
4574203f | 263 | wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); |
59277b67 BT |
264 | |
265 | /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ | |
4574203f BT |
266 | wrptr = dlfb_set_register_16be(wrptr, 0x1B, |
267 | 200*1000*1000/var->pixclock); | |
59277b67 BT |
268 | |
269 | return wrptr; | |
270 | } | |
271 | ||
272 | /* | |
273 | * This takes a standard fbdev screeninfo struct that was fetched or prepared | |
274 | * and then generates the appropriate command sequence that then drives the | |
275 | * display controller. | |
276 | */ | |
277 | static int dlfb_set_video_mode(struct dlfb_data *dev, | |
278 | struct fb_var_screeninfo *var) | |
279 | { | |
280 | char *buf; | |
281 | char *wrptr; | |
282 | int retval = 0; | |
283 | int writesize; | |
530f43a8 BT |
284 | struct urb *urb; |
285 | ||
286 | if (!atomic_read(&dev->usb_active)) | |
287 | return -EPERM; | |
59277b67 | 288 | |
530f43a8 BT |
289 | urb = dlfb_get_urb(dev); |
290 | if (!urb) | |
291 | return -ENOMEM; | |
2685cffa | 292 | |
530f43a8 | 293 | buf = (char *) urb->transfer_buffer; |
59277b67 BT |
294 | |
295 | /* | |
296 | * This first section has to do with setting the base address on the | |
297 | * controller * associated with the display. There are 2 base | |
298 | * pointers, currently, we only * use the 16 bpp segment. | |
299 | */ | |
4574203f BT |
300 | wrptr = dlfb_vidreg_lock(buf); |
301 | wrptr = dlfb_set_color_depth(wrptr, 0x00); | |
59277b67 | 302 | /* set base for 16bpp segment to 0 */ |
4574203f | 303 | wrptr = dlfb_set_base16bpp(wrptr, 0); |
59277b67 | 304 | /* set base for 8bpp segment to end of fb */ |
4574203f | 305 | wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len); |
59277b67 | 306 | |
4574203f | 307 | wrptr = dlfb_set_vid_cmds(wrptr, var); |
58e7c3b0 | 308 | wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK); |
4574203f | 309 | wrptr = dlfb_vidreg_unlock(wrptr); |
59277b67 BT |
310 | |
311 | writesize = wrptr - buf; | |
312 | ||
530f43a8 | 313 | retval = dlfb_submit_urb(dev, urb, writesize); |
59277b67 | 314 | |
58e7c3b0 BT |
315 | dev->blank_mode = FB_BLANK_UNBLANK; |
316 | ||
59277b67 BT |
317 | return retval; |
318 | } | |
319 | ||
4574203f | 320 | static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) |
88e58b1a RDI |
321 | { |
322 | unsigned long start = vma->vm_start; | |
323 | unsigned long size = vma->vm_end - vma->vm_start; | |
324 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
325 | unsigned long page, pos; | |
326 | ||
f05e0575 | 327 | if (offset + size > info->fix.smem_len) |
88e58b1a | 328 | return -EINVAL; |
88e58b1a RDI |
329 | |
330 | pos = (unsigned long)info->fix.smem_start + offset; | |
331 | ||
81f6f3c1 | 332 | pr_notice("mmap() framebuffer addr:%lu size:%lu\n", |
2685cffa BT |
333 | pos, size); |
334 | ||
88e58b1a RDI |
335 | while (size > 0) { |
336 | page = vmalloc_to_pfn((void *)pos); | |
f05e0575 | 337 | if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) |
88e58b1a | 338 | return -EAGAIN; |
f05e0575 | 339 | |
88e58b1a RDI |
340 | start += PAGE_SIZE; |
341 | pos += PAGE_SIZE; | |
342 | if (size > PAGE_SIZE) | |
343 | size -= PAGE_SIZE; | |
344 | else | |
345 | size = 0; | |
346 | } | |
347 | ||
348 | vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */ | |
349 | return 0; | |
88e58b1a RDI |
350 | } |
351 | ||
530f43a8 BT |
352 | /* |
353 | * Trims identical data from front and back of line | |
354 | * Sets new front buffer address and width | |
355 | * And returns byte count of identical pixels | |
356 | * Assumes CPU natural alignment (unsigned long) | |
357 | * for back and front buffer ptrs and width | |
358 | */ | |
359 | static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) | |
7316bc55 | 360 | { |
530f43a8 BT |
361 | int j, k; |
362 | const unsigned long *back = (const unsigned long *) bback; | |
363 | const unsigned long *front = (const unsigned long *) *bfront; | |
364 | const int width = *width_bytes / sizeof(unsigned long); | |
365 | int identical = width; | |
366 | int start = width; | |
367 | int end = width; | |
368 | ||
369 | prefetch((void *) front); | |
370 | prefetch((void *) back); | |
371 | ||
372 | for (j = 0; j < width; j++) { | |
373 | if (back[j] != front[j]) { | |
374 | start = j; | |
375 | break; | |
376 | } | |
377 | } | |
7316bc55 | 378 | |
530f43a8 BT |
379 | for (k = width - 1; k > j; k--) { |
380 | if (back[k] != front[k]) { | |
381 | end = k+1; | |
382 | break; | |
383 | } | |
7316bc55 RDI |
384 | } |
385 | ||
530f43a8 BT |
386 | identical = start + (width - end); |
387 | *bfront = (u8 *) &front[start]; | |
388 | *width_bytes = (end - start) * sizeof(unsigned long); | |
389 | ||
390 | return identical * sizeof(unsigned long); | |
7316bc55 RDI |
391 | } |
392 | ||
393 | /* | |
3b7b31fa PM |
394 | * Render a command stream for an encoded horizontal line segment of pixels. |
395 | * | |
396 | * A command buffer holds several commands. | |
397 | * It always begins with a fresh command header | |
398 | * (the protocol doesn't require this, but we enforce it to allow | |
399 | * multiple buffers to be potentially encoded and sent in parallel). | |
400 | * A single command encodes one contiguous horizontal line of pixels | |
401 | * | |
402 | * The function relies on the client to do all allocation, so that | |
403 | * rendering can be done directly to output buffers (e.g. USB URBs). | |
404 | * The function fills the supplied command buffer, providing information | |
405 | * on where it left off, so the client may call in again with additional | |
406 | * buffers if the line will take several buffers to complete. | |
407 | * | |
408 | * A single command can transmit a maximum of 256 pixels, | |
409 | * regardless of the compression ratio (protocol design limit). | |
410 | * To the hardware, 0 for a size byte means 256 | |
2685cffa | 411 | * |
3b7b31fa PM |
412 | * Rather than 256 pixel commands which are either rl or raw encoded, |
413 | * the rlx command simply assumes alternating raw and rl spans within one cmd. | |
414 | * This has a slightly larger header overhead, but produces more even results. | |
415 | * It also processes all data (read and write) in a single pass. | |
416 | * Performance benchmarks of common cases show it having just slightly better | |
2685cffa | 417 | * compression than 256 pixel raw or rle commands, with similar CPU consumpion. |
3b7b31fa PM |
418 | * But for very rl friendly data, will compress not quite as well. |
419 | */ | |
530f43a8 BT |
420 | static void dlfb_compress_hline( |
421 | const uint16_t **pixel_start_ptr, | |
422 | const uint16_t *const pixel_end, | |
423 | uint32_t *device_address_ptr, | |
424 | uint8_t **command_buffer_ptr, | |
425 | const uint8_t *const cmd_buffer_end) | |
88e58b1a | 426 | { |
530f43a8 BT |
427 | const uint16_t *pixel = *pixel_start_ptr; |
428 | uint32_t dev_addr = *device_address_ptr; | |
429 | uint8_t *cmd = *command_buffer_ptr; | |
430 | const int bpp = 2; | |
431 | ||
432 | while ((pixel_end > pixel) && | |
433 | (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { | |
434 | uint8_t *raw_pixels_count_byte = 0; | |
435 | uint8_t *cmd_pixels_count_byte = 0; | |
436 | const uint16_t *raw_pixel_start = 0; | |
437 | const uint16_t *cmd_pixel_start, *cmd_pixel_end = 0; | |
530f43a8 BT |
438 | |
439 | prefetchw((void *) cmd); /* pull in one cache line at least */ | |
440 | ||
441 | *cmd++ = 0xAF; | |
442 | *cmd++ = 0x6B; | |
1572f91c BT |
443 | *cmd++ = (uint8_t) ((dev_addr >> 16) & 0xFF); |
444 | *cmd++ = (uint8_t) ((dev_addr >> 8) & 0xFF); | |
445 | *cmd++ = (uint8_t) ((dev_addr) & 0xFF); | |
530f43a8 BT |
446 | |
447 | cmd_pixels_count_byte = cmd++; /* we'll know this later */ | |
448 | cmd_pixel_start = pixel; | |
449 | ||
450 | raw_pixels_count_byte = cmd++; /* we'll know this later */ | |
451 | raw_pixel_start = pixel; | |
452 | ||
453 | cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1, | |
454 | min((int)(pixel_end - pixel), | |
455 | (int)(cmd_buffer_end - cmd) / bpp)); | |
456 | ||
457 | prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp); | |
458 | ||
459 | while (pixel < cmd_pixel_end) { | |
460 | const uint16_t * const repeating_pixel = pixel; | |
461 | ||
462 | *(uint16_t *)cmd = cpu_to_be16p(pixel); | |
463 | cmd += 2; | |
464 | pixel++; | |
465 | ||
466 | if (unlikely((pixel < cmd_pixel_end) && | |
467 | (*pixel == *repeating_pixel))) { | |
468 | /* go back and fill in raw pixel count */ | |
469 | *raw_pixels_count_byte = ((repeating_pixel - | |
470 | raw_pixel_start) + 1) & 0xFF; | |
471 | ||
472 | while ((pixel < cmd_pixel_end) | |
473 | && (*pixel == *repeating_pixel)) { | |
474 | pixel++; | |
88e58b1a | 475 | } |
59277b67 | 476 | |
530f43a8 BT |
477 | /* immediately after raw data is repeat byte */ |
478 | *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF; | |
59277b67 | 479 | |
530f43a8 BT |
480 | /* Then start another raw pixel span */ |
481 | raw_pixel_start = pixel; | |
482 | raw_pixels_count_byte = cmd++; | |
7316bc55 | 483 | } |
88e58b1a RDI |
484 | } |
485 | ||
530f43a8 BT |
486 | if (pixel > raw_pixel_start) { |
487 | /* finalize last RAW span */ | |
488 | *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF; | |
489 | } | |
88e58b1a | 490 | |
530f43a8 BT |
491 | *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; |
492 | dev_addr += (pixel - cmd_pixel_start) * bpp; | |
88e58b1a RDI |
493 | } |
494 | ||
530f43a8 BT |
495 | if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) { |
496 | /* Fill leftover bytes with no-ops */ | |
497 | if (cmd_buffer_end > cmd) | |
498 | memset(cmd, 0xAF, cmd_buffer_end - cmd); | |
499 | cmd = (uint8_t *) cmd_buffer_end; | |
7316bc55 | 500 | } |
88e58b1a | 501 | |
530f43a8 BT |
502 | *command_buffer_ptr = cmd; |
503 | *pixel_start_ptr = pixel; | |
504 | *device_address_ptr = dev_addr; | |
88e58b1a | 505 | |
530f43a8 | 506 | return; |
88e58b1a RDI |
507 | } |
508 | ||
530f43a8 BT |
509 | /* |
510 | * There are 3 copies of every pixel: The front buffer that the fbdev | |
511 | * client renders to, the actual framebuffer across the USB bus in hardware | |
512 | * (that we can only write to, slowly, and can never read), and (optionally) | |
513 | * our shadow copy that tracks what's been sent to that hardware buffer. | |
514 | */ | |
5bea1fbf | 515 | static int dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr, |
530f43a8 BT |
516 | const char *front, char **urb_buf_ptr, |
517 | u32 byte_offset, u32 byte_width, | |
518 | int *ident_ptr, int *sent_ptr) | |
88e58b1a | 519 | { |
530f43a8 BT |
520 | const u8 *line_start, *line_end, *next_pixel; |
521 | u32 dev_addr = dev->base16 + byte_offset; | |
522 | struct urb *urb = *urb_ptr; | |
523 | u8 *cmd = *urb_buf_ptr; | |
524 | u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; | |
525 | ||
526 | line_start = (u8 *) (front + byte_offset); | |
527 | next_pixel = line_start; | |
528 | line_end = next_pixel + byte_width; | |
529 | ||
530 | if (dev->backing_buffer) { | |
531 | int offset; | |
532 | const u8 *back_start = (u8 *) (dev->backing_buffer | |
533 | + byte_offset); | |
534 | ||
535 | *ident_ptr += dlfb_trim_hline(back_start, &next_pixel, | |
536 | &byte_width); | |
537 | ||
538 | offset = next_pixel - line_start; | |
539 | line_end = next_pixel + byte_width; | |
540 | dev_addr += offset; | |
541 | back_start += offset; | |
542 | line_start += offset; | |
543 | ||
544 | memcpy((char *)back_start, (char *) line_start, | |
545 | byte_width); | |
546 | } | |
88e58b1a | 547 | |
530f43a8 BT |
548 | while (next_pixel < line_end) { |
549 | ||
550 | dlfb_compress_hline((const uint16_t **) &next_pixel, | |
551 | (const uint16_t *) line_end, &dev_addr, | |
552 | (u8 **) &cmd, (u8 *) cmd_end); | |
553 | ||
554 | if (cmd >= cmd_end) { | |
555 | int len = cmd - (u8 *) urb->transfer_buffer; | |
556 | if (dlfb_submit_urb(dev, urb, len)) | |
5bea1fbf | 557 | return 1; /* lost pixels is set */ |
530f43a8 BT |
558 | *sent_ptr += len; |
559 | urb = dlfb_get_urb(dev); | |
560 | if (!urb) | |
5bea1fbf | 561 | return 1; /* lost_pixels is set */ |
530f43a8 BT |
562 | *urb_ptr = urb; |
563 | cmd = urb->transfer_buffer; | |
564 | cmd_end = &cmd[urb->transfer_buffer_length]; | |
88e58b1a | 565 | } |
88e58b1a RDI |
566 | } |
567 | ||
530f43a8 | 568 | *urb_buf_ptr = cmd; |
5bea1fbf BT |
569 | |
570 | return 0; | |
88e58b1a RDI |
571 | } |
572 | ||
530f43a8 BT |
573 | int dlfb_handle_damage(struct dlfb_data *dev, int x, int y, |
574 | int width, int height, char *data) | |
7316bc55 | 575 | { |
7316bc55 | 576 | int i, ret; |
530f43a8 BT |
577 | char *cmd; |
578 | cycles_t start_cycles, end_cycles; | |
579 | int bytes_sent = 0; | |
580 | int bytes_identical = 0; | |
581 | struct urb *urb; | |
582 | int aligned_x; | |
583 | ||
584 | start_cycles = get_cycles(); | |
585 | ||
586 | aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long)); | |
587 | width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long)); | |
588 | x = aligned_x; | |
589 | ||
590 | if ((width <= 0) || | |
591 | (x + width > dev->info->var.xres) || | |
592 | (y + height > dev->info->var.yres)) | |
593 | return -EINVAL; | |
7316bc55 | 594 | |
530f43a8 BT |
595 | if (!atomic_read(&dev->usb_active)) |
596 | return 0; | |
7316bc55 | 597 | |
530f43a8 BT |
598 | urb = dlfb_get_urb(dev); |
599 | if (!urb) | |
600 | return 0; | |
601 | cmd = urb->transfer_buffer; | |
7316bc55 | 602 | |
530f43a8 BT |
603 | for (i = y; i < y + height ; i++) { |
604 | const int line_offset = dev->info->fix.line_length * i; | |
605 | const int byte_offset = line_offset + (x * BPP); | |
7316bc55 | 606 | |
5bea1fbf BT |
607 | if (dlfb_render_hline(dev, &urb, |
608 | (char *) dev->info->fix.smem_start, | |
2685cffa | 609 | &cmd, byte_offset, width * BPP, |
5bea1fbf BT |
610 | &bytes_identical, &bytes_sent)) |
611 | goto error; | |
7316bc55 RDI |
612 | } |
613 | ||
530f43a8 BT |
614 | if (cmd > (char *) urb->transfer_buffer) { |
615 | /* Send partial buffer remaining before exiting */ | |
616 | int len = cmd - (char *) urb->transfer_buffer; | |
617 | ret = dlfb_submit_urb(dev, urb, len); | |
618 | bytes_sent += len; | |
619 | } else | |
620 | dlfb_urb_completion(urb); | |
621 | ||
5bea1fbf | 622 | error: |
530f43a8 BT |
623 | atomic_add(bytes_sent, &dev->bytes_sent); |
624 | atomic_add(bytes_identical, &dev->bytes_identical); | |
625 | atomic_add(width*height*2, &dev->bytes_rendered); | |
626 | end_cycles = get_cycles(); | |
627 | atomic_add(((unsigned int) ((end_cycles - start_cycles) | |
628 | >> 10)), /* Kcycles */ | |
629 | &dev->cpu_kcycles_used); | |
7316bc55 | 630 | |
530f43a8 | 631 | return 0; |
7316bc55 RDI |
632 | } |
633 | ||
d46ecb9f BT |
634 | /* |
635 | * Path triggered by usermode clients who write to filesystem | |
636 | * e.g. cat filename > /dev/fb1 | |
637 | * Not used by X Windows or text-mode console. But useful for testing. | |
638 | * Slow because of extra copy and we must assume all pixels dirty. | |
639 | */ | |
640 | static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf, | |
641 | size_t count, loff_t *ppos) | |
642 | { | |
1a3e528c | 643 | ssize_t result; |
d46ecb9f BT |
644 | struct dlfb_data *dev = info->par; |
645 | u32 offset = (u32) *ppos; | |
646 | ||
d46ecb9f BT |
647 | result = fb_sys_write(info, buf, count, ppos); |
648 | ||
649 | if (result > 0) { | |
650 | int start = max((int)(offset / info->fix.line_length) - 1, 0); | |
651 | int lines = min((u32)((result / info->fix.line_length) + 1), | |
652 | (u32)info->var.yres); | |
653 | ||
654 | dlfb_handle_damage(dev, 0, start, info->var.xres, | |
655 | lines, info->screen_base); | |
656 | } | |
d46ecb9f BT |
657 | |
658 | return result; | |
659 | } | |
660 | ||
530f43a8 BT |
661 | /* hardware has native COPY command (see libdlo), but not worth it for fbcon */ |
662 | static void dlfb_ops_copyarea(struct fb_info *info, | |
663 | const struct fb_copyarea *area) | |
88e58b1a | 664 | { |
88e58b1a | 665 | |
530f43a8 | 666 | struct dlfb_data *dev = info->par; |
88e58b1a | 667 | |
530f43a8 | 668 | sys_copyarea(info, area); |
88e58b1a | 669 | |
530f43a8 BT |
670 | dlfb_handle_damage(dev, area->dx, area->dy, |
671 | area->width, area->height, info->screen_base); | |
530f43a8 | 672 | } |
88e58b1a | 673 | |
530f43a8 BT |
674 | static void dlfb_ops_imageblit(struct fb_info *info, |
675 | const struct fb_image *image) | |
676 | { | |
677 | struct dlfb_data *dev = info->par; | |
88e58b1a | 678 | |
530f43a8 | 679 | sys_imageblit(info, image); |
88e58b1a | 680 | |
530f43a8 BT |
681 | dlfb_handle_damage(dev, image->dx, image->dy, |
682 | image->width, image->height, info->screen_base); | |
88e58b1a RDI |
683 | } |
684 | ||
530f43a8 BT |
685 | static void dlfb_ops_fillrect(struct fb_info *info, |
686 | const struct fb_fillrect *rect) | |
88e58b1a | 687 | { |
88e58b1a RDI |
688 | struct dlfb_data *dev = info->par; |
689 | ||
530f43a8 | 690 | sys_fillrect(info, rect); |
88e58b1a | 691 | |
530f43a8 BT |
692 | dlfb_handle_damage(dev, rect->dx, rect->dy, rect->width, |
693 | rect->height, info->screen_base); | |
88e58b1a RDI |
694 | } |
695 | ||
d5ed5432 BT |
696 | /* |
697 | * NOTE: fb_defio.c is holding info->fbdefio.mutex | |
698 | * Touching ANY framebuffer memory that triggers a page fault | |
699 | * in fb_defio will cause a deadlock, when it also tries to | |
700 | * grab the same mutex. | |
701 | */ | |
702 | static void dlfb_dpy_deferred_io(struct fb_info *info, | |
703 | struct list_head *pagelist) | |
704 | { | |
705 | struct page *cur; | |
706 | struct fb_deferred_io *fbdefio = info->fbdefio; | |
707 | struct dlfb_data *dev = info->par; | |
708 | struct urb *urb; | |
709 | char *cmd; | |
710 | cycles_t start_cycles, end_cycles; | |
711 | int bytes_sent = 0; | |
712 | int bytes_identical = 0; | |
713 | int bytes_rendered = 0; | |
714 | ||
715 | if (!fb_defio) | |
716 | return; | |
717 | ||
718 | if (!atomic_read(&dev->usb_active)) | |
719 | return; | |
720 | ||
721 | start_cycles = get_cycles(); | |
722 | ||
723 | urb = dlfb_get_urb(dev); | |
724 | if (!urb) | |
725 | return; | |
726 | ||
727 | cmd = urb->transfer_buffer; | |
728 | ||
729 | /* walk the written page list and render each to device */ | |
730 | list_for_each_entry(cur, &fbdefio->pagelist, lru) { | |
731 | ||
5bea1fbf | 732 | if (dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start, |
d5ed5432 | 733 | &cmd, cur->index << PAGE_SHIFT, |
5bea1fbf BT |
734 | PAGE_SIZE, &bytes_identical, &bytes_sent)) |
735 | goto error; | |
d5ed5432 BT |
736 | bytes_rendered += PAGE_SIZE; |
737 | } | |
738 | ||
739 | if (cmd > (char *) urb->transfer_buffer) { | |
740 | /* Send partial buffer remaining before exiting */ | |
741 | int len = cmd - (char *) urb->transfer_buffer; | |
742 | dlfb_submit_urb(dev, urb, len); | |
743 | bytes_sent += len; | |
744 | } else | |
745 | dlfb_urb_completion(urb); | |
746 | ||
5bea1fbf | 747 | error: |
d5ed5432 BT |
748 | atomic_add(bytes_sent, &dev->bytes_sent); |
749 | atomic_add(bytes_identical, &dev->bytes_identical); | |
750 | atomic_add(bytes_rendered, &dev->bytes_rendered); | |
751 | end_cycles = get_cycles(); | |
752 | atomic_add(((unsigned int) ((end_cycles - start_cycles) | |
753 | >> 10)), /* Kcycles */ | |
754 | &dev->cpu_kcycles_used); | |
755 | } | |
756 | ||
18dffdf8 | 757 | static int dlfb_get_edid(struct dlfb_data *dev, char *edid, int len) |
7d9485e2 BT |
758 | { |
759 | int i; | |
760 | int ret; | |
18dffdf8 | 761 | char *rbuf; |
7d9485e2 | 762 | |
18dffdf8 BT |
763 | rbuf = kmalloc(2, GFP_KERNEL); |
764 | if (!rbuf) | |
765 | return 0; | |
766 | ||
767 | for (i = 0; i < len; i++) { | |
7d9485e2 BT |
768 | ret = usb_control_msg(dev->udev, |
769 | usb_rcvctrlpipe(dev->udev, 0), (0x02), | |
770 | (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2, | |
18dffdf8 BT |
771 | HZ); |
772 | if (ret < 1) { | |
81f6f3c1 | 773 | pr_err("Read EDID byte %d failed err %x\n", i, ret); |
18dffdf8 BT |
774 | i--; |
775 | break; | |
776 | } | |
777 | edid[i] = rbuf[1]; | |
7d9485e2 | 778 | } |
18dffdf8 BT |
779 | |
780 | kfree(rbuf); | |
781 | ||
782 | return i; | |
7d9485e2 BT |
783 | } |
784 | ||
4574203f | 785 | static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd, |
530f43a8 | 786 | unsigned long arg) |
88e58b1a | 787 | { |
530f43a8 BT |
788 | |
789 | struct dlfb_data *dev = info->par; | |
88e58b1a | 790 | |
530f43a8 BT |
791 | if (!atomic_read(&dev->usb_active)) |
792 | return 0; | |
793 | ||
794 | /* TODO: Update X server to get this from sysfs instead */ | |
795 | if (cmd == DLFB_IOCTL_RETURN_EDID) { | |
def76608 | 796 | void __user *edid = (void __user *)arg; |
18dffdf8 | 797 | if (copy_to_user(edid, dev->edid, dev->edid_size)) |
7316bc55 | 798 | return -EFAULT; |
7316bc55 RDI |
799 | return 0; |
800 | } | |
801 | ||
530f43a8 BT |
802 | /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ |
803 | if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { | |
def76608 DDAG |
804 | struct dloarea area; |
805 | ||
806 | if (copy_from_user(&area, (void __user *)arg, | |
807 | sizeof(struct dloarea))) | |
808 | return -EFAULT; | |
88e58b1a | 809 | |
5bea1fbf BT |
810 | /* |
811 | * If we have a damage-aware client, turn fb_defio "off" | |
25985edc | 812 | * To avoid perf imact of unnecessary page fault handling. |
5bea1fbf BT |
813 | * Done by resetting the delay for this fb_info to a very |
814 | * long period. Pages will become writable and stay that way. | |
815 | * Reset to normal value when all clients have closed this fb. | |
816 | */ | |
817 | if (info->fbdefio) | |
818 | info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE; | |
819 | ||
def76608 DDAG |
820 | if (area.x < 0) |
821 | area.x = 0; | |
88e58b1a | 822 | |
def76608 DDAG |
823 | if (area.x > info->var.xres) |
824 | area.x = info->var.xres; | |
88e58b1a | 825 | |
def76608 DDAG |
826 | if (area.y < 0) |
827 | area.y = 0; | |
88e58b1a | 828 | |
def76608 DDAG |
829 | if (area.y > info->var.yres) |
830 | area.y = info->var.yres; | |
88e58b1a | 831 | |
def76608 | 832 | dlfb_handle_damage(dev, area.x, area.y, area.w, area.h, |
88e58b1a RDI |
833 | info->screen_base); |
834 | } | |
7316bc55 | 835 | |
88e58b1a RDI |
836 | return 0; |
837 | } | |
838 | ||
f05e0575 | 839 | /* taken from vesafb */ |
88e58b1a | 840 | static int |
4574203f | 841 | dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green, |
88e58b1a RDI |
842 | unsigned blue, unsigned transp, struct fb_info *info) |
843 | { | |
844 | int err = 0; | |
845 | ||
846 | if (regno >= info->cmap.len) | |
847 | return 1; | |
848 | ||
849 | if (regno < 16) { | |
850 | if (info->var.red.offset == 10) { | |
851 | /* 1:5:5:5 */ | |
852 | ((u32 *) (info->pseudo_palette))[regno] = | |
853 | ((red & 0xf800) >> 1) | | |
854 | ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); | |
855 | } else { | |
856 | /* 0:5:6:5 */ | |
857 | ((u32 *) (info->pseudo_palette))[regno] = | |
858 | ((red & 0xf800)) | | |
859 | ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); | |
860 | } | |
861 | } | |
862 | ||
863 | return err; | |
864 | } | |
865 | ||
3e8f3d6f BT |
866 | /* |
867 | * It's common for several clients to have framebuffer open simultaneously. | |
868 | * e.g. both fbcon and X. Makes things interesting. | |
33077b8d | 869 | * Assumes caller is holding info->lock (for open and release at least) |
3e8f3d6f BT |
870 | */ |
871 | static int dlfb_ops_open(struct fb_info *info, int user) | |
872 | { | |
873 | struct dlfb_data *dev = info->par; | |
874 | ||
d5ed5432 BT |
875 | /* |
876 | * fbcon aggressively connects to first framebuffer it finds, | |
877 | * preventing other clients (X) from working properly. Usually | |
878 | * not what the user wants. Fail by default with option to enable. | |
879 | */ | |
def76608 | 880 | if ((user == 0) && (!console)) |
d5ed5432 | 881 | return -EBUSY; |
3e8f3d6f | 882 | |
33077b8d BT |
883 | /* If the USB device is gone, we don't accept new opens */ |
884 | if (dev->virtualized) | |
885 | return -ENODEV; | |
3e8f3d6f BT |
886 | |
887 | dev->fb_count++; | |
888 | ||
33077b8d BT |
889 | kref_get(&dev->kref); |
890 | ||
d5ed5432 | 891 | if (fb_defio && (info->fbdefio == NULL)) { |
5bea1fbf BT |
892 | /* enable defio at last moment if not disabled by client */ |
893 | ||
894 | struct fb_deferred_io *fbdefio; | |
895 | ||
31a9f47a | 896 | fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL); |
5bea1fbf BT |
897 | |
898 | if (fbdefio) { | |
899 | fbdefio->delay = DL_DEFIO_WRITE_DELAY; | |
900 | fbdefio->deferred_io = dlfb_dpy_deferred_io; | |
901 | } | |
902 | ||
903 | info->fbdefio = fbdefio; | |
3e8f3d6f BT |
904 | fb_deferred_io_init(info); |
905 | } | |
3e8f3d6f | 906 | |
81f6f3c1 | 907 | pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n", |
3e8f3d6f BT |
908 | info->node, user, info, dev->fb_count); |
909 | ||
88e58b1a RDI |
910 | return 0; |
911 | } | |
912 | ||
4a4854dd BT |
913 | /* |
914 | * Called when all client interfaces to start transactions have been disabled, | |
915 | * and all references to our device instance (dlfb_data) are released. | |
916 | * Every transaction must have a reference, so we know are fully spun down | |
917 | */ | |
33077b8d | 918 | static void dlfb_free(struct kref *kref) |
4a4854dd BT |
919 | { |
920 | struct dlfb_data *dev = container_of(kref, struct dlfb_data, kref); | |
921 | ||
922 | if (dev->backing_buffer) | |
923 | vfree(dev->backing_buffer); | |
924 | ||
33077b8d BT |
925 | kfree(dev->edid); |
926 | ||
81f6f3c1 | 927 | pr_warn("freeing dlfb_data %p\n", dev); |
3e8f3d6f | 928 | |
4a4854dd BT |
929 | kfree(dev); |
930 | } | |
931 | ||
5bea1fbf BT |
932 | static void dlfb_release_urb_work(struct work_struct *work) |
933 | { | |
934 | struct urb_node *unode = container_of(work, struct urb_node, | |
935 | release_urb_work.work); | |
936 | ||
937 | up(&unode->dev->urbs.limit_sem); | |
938 | } | |
33077b8d | 939 | |
8d21547d | 940 | static void dlfb_free_framebuffer(struct dlfb_data *dev) |
2469d5db | 941 | { |
33077b8d | 942 | struct fb_info *info = dev->info; |
33077b8d | 943 | |
8d21547d BT |
944 | if (info) { |
945 | int node = info->node; | |
2469d5db | 946 | |
8d21547d | 947 | unregister_framebuffer(info); |
2469d5db | 948 | |
8d21547d BT |
949 | if (info->cmap.len != 0) |
950 | fb_dealloc_cmap(&info->cmap); | |
951 | if (info->monspecs.modedb) | |
952 | fb_destroy_modedb(info->monspecs.modedb); | |
953 | if (info->screen_base) | |
954 | vfree(info->screen_base); | |
2469d5db | 955 | |
8d21547d | 956 | fb_destroy_modelist(&info->modelist); |
33077b8d | 957 | |
8d21547d | 958 | dev->info = NULL; |
2469d5db | 959 | |
8d21547d BT |
960 | /* Assume info structure is freed after this point */ |
961 | framebuffer_release(info); | |
2469d5db | 962 | |
8d21547d BT |
963 | pr_warn("fb_info for /dev/fb%d has been freed\n", node); |
964 | } | |
33077b8d BT |
965 | |
966 | /* ref taken in probe() as part of registering framebfufer */ | |
967 | kref_put(&dev->kref, dlfb_free); | |
968 | } | |
969 | ||
8d21547d BT |
970 | static void dlfb_free_framebuffer_work(struct work_struct *work) |
971 | { | |
972 | struct dlfb_data *dev = container_of(work, struct dlfb_data, | |
973 | free_framebuffer_work.work); | |
974 | dlfb_free_framebuffer(dev); | |
975 | } | |
33077b8d BT |
976 | /* |
977 | * Assumes caller is holding info->lock mutex (for open and release at least) | |
978 | */ | |
979 | static int dlfb_ops_release(struct fb_info *info, int user) | |
980 | { | |
981 | struct dlfb_data *dev = info->par; | |
982 | ||
983 | dev->fb_count--; | |
984 | ||
985 | /* We can't free fb_info here - fbmem will touch it when we return */ | |
986 | if (dev->virtualized && (dev->fb_count == 0)) | |
987 | schedule_delayed_work(&dev->free_framebuffer_work, HZ); | |
988 | ||
33077b8d BT |
989 | if ((dev->fb_count == 0) && (info->fbdefio)) { |
990 | fb_deferred_io_cleanup(info); | |
991 | kfree(info->fbdefio); | |
992 | info->fbdefio = NULL; | |
993 | info->fbops->fb_mmap = dlfb_ops_mmap; | |
994 | } | |
33077b8d | 995 | |
81f6f3c1 | 996 | pr_warn("released /dev/fb%d user=%d count=%d\n", |
33077b8d BT |
997 | info->node, user, dev->fb_count); |
998 | ||
999 | kref_put(&dev->kref, dlfb_free); | |
1000 | ||
1001 | return 0; | |
2469d5db BT |
1002 | } |
1003 | ||
7d9485e2 BT |
1004 | /* |
1005 | * Check whether a video mode is supported by the DisplayLink chip | |
1006 | * We start from monitor's modes, so don't need to filter that here | |
1007 | */ | |
1008 | static int dlfb_is_valid_mode(struct fb_videomode *mode, | |
1009 | struct fb_info *info) | |
1010 | { | |
1011 | struct dlfb_data *dev = info->par; | |
1012 | ||
18dffdf8 | 1013 | if (mode->xres * mode->yres > dev->sku_pixel_limit) { |
81f6f3c1 | 1014 | pr_warn("%dx%d beyond chip capabilities\n", |
18dffdf8 | 1015 | mode->xres, mode->yres); |
7d9485e2 | 1016 | return 0; |
18dffdf8 BT |
1017 | } |
1018 | ||
9daee73c MD |
1019 | pr_info("%dx%d @ %d Hz valid mode\n", mode->xres, mode->yres, |
1020 | mode->refresh); | |
7d9485e2 BT |
1021 | |
1022 | return 1; | |
1023 | } | |
1024 | ||
1025 | static void dlfb_var_color_format(struct fb_var_screeninfo *var) | |
1026 | { | |
1027 | const struct fb_bitfield red = { 11, 5, 0 }; | |
1028 | const struct fb_bitfield green = { 5, 6, 0 }; | |
1029 | const struct fb_bitfield blue = { 0, 5, 0 }; | |
1030 | ||
1031 | var->bits_per_pixel = 16; | |
1032 | var->red = red; | |
1033 | var->green = green; | |
1034 | var->blue = blue; | |
1035 | } | |
1036 | ||
2469d5db BT |
1037 | static int dlfb_ops_check_var(struct fb_var_screeninfo *var, |
1038 | struct fb_info *info) | |
1039 | { | |
1040 | struct fb_videomode mode; | |
1041 | ||
1042 | /* TODO: support dynamically changing framebuffer size */ | |
1043 | if ((var->xres * var->yres * 2) > info->fix.smem_len) | |
1044 | return -EINVAL; | |
1045 | ||
1046 | /* set device-specific elements of var unrelated to mode */ | |
1047 | dlfb_var_color_format(var); | |
1048 | ||
1049 | fb_var_to_videomode(&mode, var); | |
1050 | ||
1051 | if (!dlfb_is_valid_mode(&mode, info)) | |
1052 | return -EINVAL; | |
1053 | ||
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | static int dlfb_ops_set_par(struct fb_info *info) | |
1058 | { | |
1059 | struct dlfb_data *dev = info->par; | |
18dffdf8 BT |
1060 | int result; |
1061 | u16 *pix_framebuffer; | |
1062 | int i; | |
2469d5db | 1063 | |
81f6f3c1 | 1064 | pr_notice("set_par mode %dx%d\n", info->var.xres, info->var.yres); |
2469d5db | 1065 | |
18dffdf8 BT |
1066 | result = dlfb_set_video_mode(dev, &info->var); |
1067 | ||
1068 | if ((result == 0) && (dev->fb_count == 0)) { | |
1069 | ||
1070 | /* paint greenscreen */ | |
1071 | ||
1072 | pix_framebuffer = (u16 *) info->screen_base; | |
1073 | for (i = 0; i < info->fix.smem_len / 2; i++) | |
1074 | pix_framebuffer[i] = 0x37e6; | |
1075 | ||
1076 | dlfb_handle_damage(dev, 0, 0, info->var.xres, info->var.yres, | |
1077 | info->screen_base); | |
1078 | } | |
1079 | ||
1080 | return result; | |
2469d5db BT |
1081 | } |
1082 | ||
58e7c3b0 BT |
1083 | /* To fonzi the jukebox (e.g. make blanking changes take effect) */ |
1084 | static char *dlfb_dummy_render(char *buf) | |
1085 | { | |
1086 | *buf++ = 0xAF; | |
1087 | *buf++ = 0x6A; /* copy */ | |
1088 | *buf++ = 0x00; /* from address*/ | |
1089 | *buf++ = 0x00; | |
1090 | *buf++ = 0x00; | |
1091 | *buf++ = 0x01; /* one pixel */ | |
1092 | *buf++ = 0x00; /* to address */ | |
1093 | *buf++ = 0x00; | |
1094 | *buf++ = 0x00; | |
1095 | return buf; | |
1096 | } | |
1097 | ||
9825f70f BT |
1098 | /* |
1099 | * In order to come back from full DPMS off, we need to set the mode again | |
1100 | */ | |
4574203f | 1101 | static int dlfb_ops_blank(int blank_mode, struct fb_info *info) |
f05e0575 | 1102 | { |
530f43a8 | 1103 | struct dlfb_data *dev = info->par; |
58e7c3b0 BT |
1104 | char *bufptr; |
1105 | struct urb *urb; | |
7316bc55 | 1106 | |
58e7c3b0 BT |
1107 | pr_info("/dev/fb%d FB_BLANK mode %d --> %d\n", |
1108 | info->node, dev->blank_mode, blank_mode); | |
530f43a8 | 1109 | |
58e7c3b0 BT |
1110 | if ((dev->blank_mode == FB_BLANK_POWERDOWN) && |
1111 | (blank_mode != FB_BLANK_POWERDOWN)) { | |
9825f70f | 1112 | |
58e7c3b0 | 1113 | /* returning from powerdown requires a fresh modeset */ |
9825f70f | 1114 | dlfb_set_video_mode(dev, &info->var); |
7316bc55 | 1115 | } |
7316bc55 | 1116 | |
58e7c3b0 BT |
1117 | urb = dlfb_get_urb(dev); |
1118 | if (!urb) | |
1119 | return 0; | |
1120 | ||
1121 | bufptr = (char *) urb->transfer_buffer; | |
1122 | bufptr = dlfb_vidreg_lock(bufptr); | |
1123 | bufptr = dlfb_blanking(bufptr, blank_mode); | |
1124 | bufptr = dlfb_vidreg_unlock(bufptr); | |
1125 | ||
1126 | /* seems like a render op is needed to have blank change take effect */ | |
1127 | bufptr = dlfb_dummy_render(bufptr); | |
1128 | ||
1129 | dlfb_submit_urb(dev, urb, bufptr - | |
1130 | (char *) urb->transfer_buffer); | |
1131 | ||
1132 | dev->blank_mode = blank_mode; | |
1133 | ||
88e58b1a RDI |
1134 | return 0; |
1135 | } | |
1136 | ||
1137 | static struct fb_ops dlfb_ops = { | |
2469d5db | 1138 | .owner = THIS_MODULE, |
1a3e528c | 1139 | .fb_read = fb_sys_read, |
d46ecb9f | 1140 | .fb_write = dlfb_ops_write, |
4574203f BT |
1141 | .fb_setcolreg = dlfb_ops_setcolreg, |
1142 | .fb_fillrect = dlfb_ops_fillrect, | |
1143 | .fb_copyarea = dlfb_ops_copyarea, | |
1144 | .fb_imageblit = dlfb_ops_imageblit, | |
1145 | .fb_mmap = dlfb_ops_mmap, | |
1146 | .fb_ioctl = dlfb_ops_ioctl, | |
3e8f3d6f | 1147 | .fb_open = dlfb_ops_open, |
4574203f BT |
1148 | .fb_release = dlfb_ops_release, |
1149 | .fb_blank = dlfb_ops_blank, | |
2469d5db BT |
1150 | .fb_check_var = dlfb_ops_check_var, |
1151 | .fb_set_par = dlfb_ops_set_par, | |
88e58b1a RDI |
1152 | }; |
1153 | ||
18dffdf8 | 1154 | |
7d9485e2 | 1155 | /* |
18dffdf8 BT |
1156 | * Assumes &info->lock held by caller |
1157 | * Assumes no active clients have framebuffer open | |
1158 | */ | |
1159 | static int dlfb_realloc_framebuffer(struct dlfb_data *dev, struct fb_info *info) | |
1160 | { | |
1161 | int retval = -ENOMEM; | |
1162 | int old_len = info->fix.smem_len; | |
1163 | int new_len; | |
1164 | unsigned char *old_fb = info->screen_base; | |
1165 | unsigned char *new_fb; | |
d3189545 | 1166 | unsigned char *new_back = 0; |
18dffdf8 | 1167 | |
81f6f3c1 | 1168 | pr_warn("Reallocating framebuffer. Addresses will change!\n"); |
18dffdf8 BT |
1169 | |
1170 | new_len = info->fix.line_length * info->var.yres; | |
1171 | ||
1172 | if (PAGE_ALIGN(new_len) > old_len) { | |
1173 | /* | |
1174 | * Alloc system memory for virtual framebuffer | |
1175 | */ | |
1176 | new_fb = vmalloc(new_len); | |
1177 | if (!new_fb) { | |
81f6f3c1 | 1178 | pr_err("Virtual framebuffer alloc failed\n"); |
18dffdf8 BT |
1179 | goto error; |
1180 | } | |
1181 | ||
1182 | if (info->screen_base) { | |
1183 | memcpy(new_fb, old_fb, old_len); | |
1184 | vfree(info->screen_base); | |
1185 | } | |
1186 | ||
1187 | info->screen_base = new_fb; | |
1188 | info->fix.smem_len = PAGE_ALIGN(new_len); | |
1189 | info->fix.smem_start = (unsigned long) new_fb; | |
1190 | info->flags = udlfb_info_flags; | |
1191 | ||
1192 | /* | |
1193 | * Second framebuffer copy to mirror the framebuffer state | |
1194 | * on the physical USB device. We can function without this. | |
1195 | * But with imperfect damage info we may send pixels over USB | |
1196 | * that were, in fact, unchanged - wasting limited USB bandwidth | |
1197 | */ | |
d3189545 SH |
1198 | if (shadow) |
1199 | new_back = vzalloc(new_len); | |
18dffdf8 | 1200 | if (!new_back) |
949f6711 | 1201 | pr_info("No shadow/backing buffer allocated\n"); |
18dffdf8 BT |
1202 | else { |
1203 | if (dev->backing_buffer) | |
1204 | vfree(dev->backing_buffer); | |
1205 | dev->backing_buffer = new_back; | |
18dffdf8 BT |
1206 | } |
1207 | } | |
1208 | ||
1209 | retval = 0; | |
1210 | ||
1211 | error: | |
1212 | return retval; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * 1) Get EDID from hw, or use sw default | |
1217 | * 2) Parse into various fb_info structs | |
1218 | * 3) Allocate virtual framebuffer memory to back highest res mode | |
1219 | * | |
1220 | * Parses EDID into three places used by various parts of fbdev: | |
7d9485e2 BT |
1221 | * fb_var_screeninfo contains the timing of the monitor's preferred mode |
1222 | * fb_info.monspecs is full parsed EDID info, including monspecs.modedb | |
1223 | * fb_info.modelist is a linked list of all monitor & VESA modes which work | |
1224 | * | |
1225 | * If EDID is not readable/valid, then modelist is all VESA modes, | |
1226 | * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode | |
18dffdf8 | 1227 | * Returns 0 if successful |
7d9485e2 | 1228 | */ |
18dffdf8 BT |
1229 | static int dlfb_setup_modes(struct dlfb_data *dev, |
1230 | struct fb_info *info, | |
1231 | char *default_edid, size_t default_edid_size) | |
7d9485e2 BT |
1232 | { |
1233 | int i; | |
1234 | const struct fb_videomode *default_vmode = NULL; | |
1235 | int result = 0; | |
18dffdf8 BT |
1236 | char *edid; |
1237 | int tries = 3; | |
1238 | ||
1239 | if (info->dev) /* only use mutex if info has been registered */ | |
1240 | mutex_lock(&info->lock); | |
1241 | ||
b9f03a3c | 1242 | edid = kmalloc(EDID_LENGTH, GFP_KERNEL); |
18dffdf8 BT |
1243 | if (!edid) { |
1244 | result = -ENOMEM; | |
1245 | goto error; | |
1246 | } | |
7d9485e2 BT |
1247 | |
1248 | fb_destroy_modelist(&info->modelist); | |
1249 | memset(&info->monspecs, 0, sizeof(info->monspecs)); | |
1250 | ||
18dffdf8 BT |
1251 | /* |
1252 | * Try to (re)read EDID from hardware first | |
1253 | * EDID data may return, but not parse as valid | |
1254 | * Try again a few times, in case of e.g. analog cable noise | |
1255 | */ | |
1256 | while (tries--) { | |
1257 | ||
b9f03a3c | 1258 | i = dlfb_get_edid(dev, edid, EDID_LENGTH); |
18dffdf8 | 1259 | |
b9f03a3c | 1260 | if (i >= EDID_LENGTH) |
18dffdf8 BT |
1261 | fb_edid_to_monspecs(edid, &info->monspecs); |
1262 | ||
1263 | if (info->monspecs.modedb_len > 0) { | |
1264 | dev->edid = edid; | |
1265 | dev->edid_size = i; | |
1266 | break; | |
1267 | } | |
1268 | } | |
1269 | ||
1270 | /* If that fails, use a previously returned EDID if available */ | |
1271 | if (info->monspecs.modedb_len == 0) { | |
1272 | ||
81f6f3c1 | 1273 | pr_err("Unable to get valid EDID from device/display\n"); |
18dffdf8 BT |
1274 | |
1275 | if (dev->edid) { | |
1276 | fb_edid_to_monspecs(dev->edid, &info->monspecs); | |
1277 | if (info->monspecs.modedb_len > 0) | |
81f6f3c1 | 1278 | pr_err("Using previously queried EDID\n"); |
18dffdf8 BT |
1279 | } |
1280 | } | |
1281 | ||
1282 | /* If that fails, use the default EDID we were handed */ | |
1283 | if (info->monspecs.modedb_len == 0) { | |
b9f03a3c | 1284 | if (default_edid_size >= EDID_LENGTH) { |
18dffdf8 BT |
1285 | fb_edid_to_monspecs(default_edid, &info->monspecs); |
1286 | if (info->monspecs.modedb_len > 0) { | |
1287 | memcpy(edid, default_edid, default_edid_size); | |
1288 | dev->edid = edid; | |
1289 | dev->edid_size = default_edid_size; | |
81f6f3c1 | 1290 | pr_err("Using default/backup EDID\n"); |
18dffdf8 BT |
1291 | } |
1292 | } | |
1293 | } | |
7d9485e2 | 1294 | |
18dffdf8 | 1295 | /* If we've got modes, let's pick a best default mode */ |
7d9485e2 BT |
1296 | if (info->monspecs.modedb_len > 0) { |
1297 | ||
1298 | for (i = 0; i < info->monspecs.modedb_len; i++) { | |
1299 | if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info)) | |
1300 | fb_add_videomode(&info->monspecs.modedb[i], | |
1301 | &info->modelist); | |
9377c517 WK |
1302 | else { |
1303 | if (i == 0) | |
1304 | /* if we've removed top/best mode */ | |
1305 | info->monspecs.misc | |
1306 | &= ~FB_MISC_1ST_DETAIL; | |
1307 | } | |
7d9485e2 BT |
1308 | } |
1309 | ||
1310 | default_vmode = fb_find_best_display(&info->monspecs, | |
1311 | &info->modelist); | |
18dffdf8 | 1312 | } |
7d9485e2 | 1313 | |
18dffdf8 BT |
1314 | /* If everything else has failed, fall back to safe default mode */ |
1315 | if (default_vmode == NULL) { | |
1316 | ||
1317 | struct fb_videomode fb_vmode = {0}; | |
7d9485e2 BT |
1318 | |
1319 | /* | |
1320 | * Add the standard VESA modes to our modelist | |
1321 | * Since we don't have EDID, there may be modes that | |
1322 | * overspec monitor and/or are incorrect aspect ratio, etc. | |
1323 | * But at least the user has a chance to choose | |
1324 | */ | |
1325 | for (i = 0; i < VESA_MODEDB_SIZE; i++) { | |
1326 | if (dlfb_is_valid_mode((struct fb_videomode *) | |
1327 | &vesa_modes[i], info)) | |
1328 | fb_add_videomode(&vesa_modes[i], | |
1329 | &info->modelist); | |
1330 | } | |
1331 | ||
1332 | /* | |
1333 | * default to resolution safe for projectors | |
1334 | * (since they are most common case without EDID) | |
1335 | */ | |
1336 | fb_vmode.xres = 800; | |
1337 | fb_vmode.yres = 600; | |
1338 | fb_vmode.refresh = 60; | |
1339 | default_vmode = fb_find_nearest_mode(&fb_vmode, | |
1340 | &info->modelist); | |
1341 | } | |
1342 | ||
18dffdf8 BT |
1343 | /* If we have good mode and no active clients*/ |
1344 | if ((default_vmode != NULL) && (dev->fb_count == 0)) { | |
1345 | ||
1346 | fb_videomode_to_var(&info->var, default_vmode); | |
1347 | dlfb_var_color_format(&info->var); | |
1348 | ||
1349 | /* | |
1350 | * with mode size info, we can now alloc our framebuffer. | |
1351 | */ | |
1352 | memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix)); | |
1353 | info->fix.line_length = info->var.xres * | |
1354 | (info->var.bits_per_pixel / 8); | |
1355 | ||
1356 | result = dlfb_realloc_framebuffer(dev, info); | |
1357 | ||
1358 | } else | |
1359 | result = -EINVAL; | |
1360 | ||
1361 | error: | |
1362 | if (edid && (dev->edid != edid)) | |
1363 | kfree(edid); | |
1364 | ||
1365 | if (info->dev) | |
1366 | mutex_unlock(&info->lock); | |
7d9485e2 BT |
1367 | |
1368 | return result; | |
1369 | } | |
1370 | ||
1371 | static ssize_t metrics_bytes_rendered_show(struct device *fbdev, | |
1372 | struct device_attribute *a, char *buf) { | |
1373 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1374 | struct dlfb_data *dev = fb_info->par; | |
1375 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1376 | atomic_read(&dev->bytes_rendered)); | |
1377 | } | |
1378 | ||
1379 | static ssize_t metrics_bytes_identical_show(struct device *fbdev, | |
1380 | struct device_attribute *a, char *buf) { | |
1381 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1382 | struct dlfb_data *dev = fb_info->par; | |
1383 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1384 | atomic_read(&dev->bytes_identical)); | |
1385 | } | |
1386 | ||
1387 | static ssize_t metrics_bytes_sent_show(struct device *fbdev, | |
1388 | struct device_attribute *a, char *buf) { | |
1389 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1390 | struct dlfb_data *dev = fb_info->par; | |
1391 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1392 | atomic_read(&dev->bytes_sent)); | |
1393 | } | |
1394 | ||
1395 | static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev, | |
1396 | struct device_attribute *a, char *buf) { | |
1397 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1398 | struct dlfb_data *dev = fb_info->par; | |
1399 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
1400 | atomic_read(&dev->cpu_kcycles_used)); | |
1401 | } | |
1402 | ||
18dffdf8 BT |
1403 | static ssize_t edid_show( |
1404 | struct file *filp, | |
1405 | struct kobject *kobj, struct bin_attribute *a, | |
7d9485e2 BT |
1406 | char *buf, loff_t off, size_t count) { |
1407 | struct device *fbdev = container_of(kobj, struct device, kobj); | |
1408 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1409 | struct dlfb_data *dev = fb_info->par; | |
7d9485e2 | 1410 | |
18dffdf8 | 1411 | if (dev->edid == NULL) |
7d9485e2 BT |
1412 | return 0; |
1413 | ||
18dffdf8 | 1414 | if ((off >= dev->edid_size) || (count > dev->edid_size)) |
7d9485e2 BT |
1415 | return 0; |
1416 | ||
18dffdf8 BT |
1417 | if (off + count > dev->edid_size) |
1418 | count = dev->edid_size - off; | |
1419 | ||
81f6f3c1 | 1420 | pr_info("sysfs edid copy %p to %p, %d bytes\n", |
18dffdf8 BT |
1421 | dev->edid, buf, (int) count); |
1422 | ||
1423 | memcpy(buf, dev->edid, count); | |
7d9485e2 BT |
1424 | |
1425 | return count; | |
1426 | } | |
1427 | ||
8ef8cc4f BT |
1428 | static ssize_t edid_store( |
1429 | struct file *filp, | |
1430 | struct kobject *kobj, struct bin_attribute *a, | |
1431 | char *src, loff_t src_off, size_t src_size) { | |
1432 | struct device *fbdev = container_of(kobj, struct device, kobj); | |
1433 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1434 | struct dlfb_data *dev = fb_info->par; | |
e71ff6f2 | 1435 | int ret; |
8ef8cc4f BT |
1436 | |
1437 | /* We only support write of entire EDID at once, no offset*/ | |
b9f03a3c | 1438 | if ((src_size != EDID_LENGTH) || (src_off != 0)) |
e71ff6f2 | 1439 | return -EINVAL; |
8ef8cc4f | 1440 | |
e71ff6f2 OS |
1441 | ret = dlfb_setup_modes(dev, fb_info, src, src_size); |
1442 | if (ret) | |
1443 | return ret; | |
8ef8cc4f | 1444 | |
e71ff6f2 OS |
1445 | if (!dev->edid || memcmp(src, dev->edid, src_size)) |
1446 | return -EINVAL; | |
1447 | ||
1448 | pr_info("sysfs written EDID is new default\n"); | |
1449 | dlfb_ops_set_par(fb_info); | |
1450 | return src_size; | |
8ef8cc4f | 1451 | } |
7d9485e2 BT |
1452 | |
1453 | static ssize_t metrics_reset_store(struct device *fbdev, | |
1454 | struct device_attribute *attr, | |
1455 | const char *buf, size_t count) | |
1456 | { | |
1457 | struct fb_info *fb_info = dev_get_drvdata(fbdev); | |
1458 | struct dlfb_data *dev = fb_info->par; | |
1459 | ||
1460 | atomic_set(&dev->bytes_rendered, 0); | |
1461 | atomic_set(&dev->bytes_identical, 0); | |
1462 | atomic_set(&dev->bytes_sent, 0); | |
1463 | atomic_set(&dev->cpu_kcycles_used, 0); | |
7d9485e2 BT |
1464 | |
1465 | return count; | |
1466 | } | |
1467 | ||
7d9485e2 BT |
1468 | static struct bin_attribute edid_attr = { |
1469 | .attr.name = "edid", | |
8ef8cc4f | 1470 | .attr.mode = 0666, |
b9f03a3c | 1471 | .size = EDID_LENGTH, |
7d9485e2 | 1472 | .read = edid_show, |
8ef8cc4f | 1473 | .write = edid_store |
7d9485e2 BT |
1474 | }; |
1475 | ||
1476 | static struct device_attribute fb_device_attrs[] = { | |
1477 | __ATTR_RO(metrics_bytes_rendered), | |
1478 | __ATTR_RO(metrics_bytes_identical), | |
1479 | __ATTR_RO(metrics_bytes_sent), | |
1480 | __ATTR_RO(metrics_cpu_kcycles_used), | |
926c1115 | 1481 | __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store), |
7d9485e2 BT |
1482 | }; |
1483 | ||
cc403dc6 BT |
1484 | /* |
1485 | * This is necessary before we can communicate with the display controller. | |
1486 | */ | |
1487 | static int dlfb_select_std_channel(struct dlfb_data *dev) | |
1488 | { | |
1489 | int ret; | |
1490 | u8 set_def_chn[] = { 0x57, 0xCD, 0xDC, 0xA7, | |
1491 | 0x1C, 0x88, 0x5E, 0x15, | |
1492 | 0x60, 0xFE, 0xC6, 0x97, | |
1493 | 0x16, 0x3D, 0x47, 0xF2 }; | |
1494 | ||
1495 | ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
1496 | NR_USB_REQUEST_CHANNEL, | |
1497 | (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, | |
1498 | set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT); | |
1499 | return ret; | |
1500 | } | |
1501 | ||
18dffdf8 | 1502 | static int dlfb_parse_vendor_descriptor(struct dlfb_data *dev, |
f2e1fc9d | 1503 | struct usb_interface *interface) |
18dffdf8 BT |
1504 | { |
1505 | char *desc; | |
1506 | char *buf; | |
1507 | char *desc_end; | |
1508 | ||
f2e1fc9d | 1509 | int total_len = 0; |
18dffdf8 BT |
1510 | |
1511 | buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); | |
1512 | if (!buf) | |
1513 | return false; | |
1514 | desc = buf; | |
1515 | ||
f2e1fc9d AK |
1516 | total_len = usb_get_descriptor(interface_to_usbdev(interface), |
1517 | 0x5f, /* vendor specific */ | |
1518 | 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); | |
1519 | ||
1520 | /* if not found, look in configuration descriptor */ | |
1521 | if (total_len < 0) { | |
1522 | if (0 == usb_get_extra_descriptor(interface->cur_altsetting, | |
1523 | 0x5f, &desc)) | |
1524 | total_len = (int) desc[0]; | |
1525 | } | |
1526 | ||
18dffdf8 | 1527 | if (total_len > 5) { |
81f6f3c1 | 1528 | pr_info("vendor descriptor length:%x data:%02x %02x %02x %02x" \ |
18dffdf8 BT |
1529 | "%02x %02x %02x %02x %02x %02x %02x\n", |
1530 | total_len, desc[0], | |
1531 | desc[1], desc[2], desc[3], desc[4], desc[5], desc[6], | |
1532 | desc[7], desc[8], desc[9], desc[10]); | |
1533 | ||
1534 | if ((desc[0] != total_len) || /* descriptor length */ | |
1535 | (desc[1] != 0x5f) || /* vendor descriptor type */ | |
1536 | (desc[2] != 0x01) || /* version (2 bytes) */ | |
1537 | (desc[3] != 0x00) || | |
1538 | (desc[4] != total_len - 2)) /* length after type */ | |
1539 | goto unrecognized; | |
1540 | ||
1541 | desc_end = desc + total_len; | |
1542 | desc += 5; /* the fixed header we've already parsed */ | |
1543 | ||
1544 | while (desc < desc_end) { | |
1545 | u8 length; | |
1546 | u16 key; | |
1547 | ||
b49f184b | 1548 | key = le16_to_cpu(*((u16 *) desc)); |
18dffdf8 BT |
1549 | desc += sizeof(u16); |
1550 | length = *desc; | |
1551 | desc++; | |
1552 | ||
1553 | switch (key) { | |
1554 | case 0x0200: { /* max_area */ | |
1555 | u32 max_area; | |
1556 | max_area = le32_to_cpu(*((u32 *)desc)); | |
81f6f3c1 | 1557 | pr_warn("DL chip limited to %d pixel modes\n", |
18dffdf8 BT |
1558 | max_area); |
1559 | dev->sku_pixel_limit = max_area; | |
1560 | break; | |
1561 | } | |
1562 | default: | |
1563 | break; | |
1564 | } | |
1565 | desc += length; | |
1566 | } | |
f2e1fc9d AK |
1567 | } else { |
1568 | pr_info("vendor descriptor not available (%d)\n", total_len); | |
18dffdf8 BT |
1569 | } |
1570 | ||
1571 | goto success; | |
2469d5db | 1572 | |
18dffdf8 BT |
1573 | unrecognized: |
1574 | /* allow udlfb to load for now even if firmware unrecognized */ | |
81f6f3c1 | 1575 | pr_err("Unrecognized vendor firmware descriptor\n"); |
18dffdf8 BT |
1576 | |
1577 | success: | |
1578 | kfree(buf); | |
1579 | return true; | |
1580 | } | |
8d21547d BT |
1581 | |
1582 | static void dlfb_init_framebuffer_work(struct work_struct *work); | |
1583 | ||
2469d5db | 1584 | static int dlfb_usb_probe(struct usb_interface *interface, |
59277b67 | 1585 | const struct usb_device_id *id) |
88e58b1a | 1586 | { |
59277b67 | 1587 | struct usb_device *usbdev; |
18dffdf8 | 1588 | struct dlfb_data *dev = 0; |
59277b67 | 1589 | int retval = -ENOMEM; |
59277b67 | 1590 | |
2469d5db BT |
1591 | /* usb initialization */ |
1592 | ||
1593 | usbdev = interface_to_usbdev(interface); | |
59277b67 BT |
1594 | |
1595 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1596 | if (dev == NULL) { | |
2469d5db BT |
1597 | err("dlfb_usb_probe: failed alloc of dev struct\n"); |
1598 | goto error; | |
88e58b1a | 1599 | } |
88e58b1a | 1600 | |
2469d5db | 1601 | kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */ |
2469d5db | 1602 | |
59277b67 | 1603 | dev->udev = usbdev; |
4a4854dd | 1604 | dev->gdev = &usbdev->dev; /* our generic struct device * */ |
59277b67 BT |
1605 | usb_set_intfdata(interface, dev); |
1606 | ||
81f6f3c1 | 1607 | pr_info("%s %s - serial #%s\n", |
18dffdf8 | 1608 | usbdev->manufacturer, usbdev->product, usbdev->serial); |
81f6f3c1 | 1609 | pr_info("vid_%04x&pid_%04x&rev_%04x driver's dlfb_data struct at %p\n", |
18dffdf8 BT |
1610 | usbdev->descriptor.idVendor, usbdev->descriptor.idProduct, |
1611 | usbdev->descriptor.bcdDevice, dev); | |
81f6f3c1 PM |
1612 | pr_info("console enable=%d\n", console); |
1613 | pr_info("fb_defio enable=%d\n", fb_defio); | |
d3189545 | 1614 | pr_info("shadow enable=%d\n", shadow); |
18dffdf8 BT |
1615 | |
1616 | dev->sku_pixel_limit = 2048 * 1152; /* default to maximum */ | |
1617 | ||
f2e1fc9d | 1618 | if (!dlfb_parse_vendor_descriptor(dev, interface)) { |
81f6f3c1 | 1619 | pr_err("firmware not recognized. Assume incompatible device\n"); |
18dffdf8 BT |
1620 | goto error; |
1621 | } | |
1622 | ||
664c5f18 BC |
1623 | if (pixel_limit) { |
1624 | pr_warn("DL chip limit of %d overriden" | |
1625 | " by module param to %d\n", | |
1626 | dev->sku_pixel_limit, pixel_limit); | |
1627 | dev->sku_pixel_limit = pixel_limit; | |
1628 | } | |
1629 | ||
1630 | ||
2469d5db BT |
1631 | if (!dlfb_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) { |
1632 | retval = -ENOMEM; | |
81f6f3c1 | 1633 | pr_err("dlfb_alloc_urb_list failed\n"); |
2469d5db BT |
1634 | goto error; |
1635 | } | |
1636 | ||
8d21547d BT |
1637 | kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */ |
1638 | ||
2469d5db | 1639 | /* We don't register a new USB class. Our client interface is fbdev */ |
59277b67 | 1640 | |
8d21547d BT |
1641 | /* Workitem keep things fast & simple during USB enumeration */ |
1642 | INIT_DELAYED_WORK(&dev->init_framebuffer_work, | |
1643 | dlfb_init_framebuffer_work); | |
1644 | schedule_delayed_work(&dev->init_framebuffer_work, 0); | |
1645 | ||
1646 | return 0; | |
1647 | ||
1648 | error: | |
1649 | if (dev) { | |
1650 | ||
1651 | kref_put(&dev->kref, dlfb_free); /* ref for framebuffer */ | |
1652 | kref_put(&dev->kref, dlfb_free); /* last ref from kref_init */ | |
1653 | ||
1654 | /* dev has been deallocated. Do not dereference */ | |
1655 | } | |
1656 | ||
1657 | return retval; | |
1658 | } | |
1659 | ||
1660 | static void dlfb_init_framebuffer_work(struct work_struct *work) | |
1661 | { | |
1662 | struct dlfb_data *dev = container_of(work, struct dlfb_data, | |
1663 | init_framebuffer_work.work); | |
1664 | struct fb_info *info; | |
1665 | int retval; | |
1666 | int i; | |
1667 | ||
2469d5db | 1668 | /* allocates framebuffer driver structure, not framebuffer memory */ |
8d21547d | 1669 | info = framebuffer_alloc(0, dev->gdev); |
2469d5db BT |
1670 | if (!info) { |
1671 | retval = -ENOMEM; | |
81f6f3c1 | 1672 | pr_err("framebuffer_alloc failed\n"); |
2469d5db BT |
1673 | goto error; |
1674 | } | |
33077b8d | 1675 | |
59277b67 BT |
1676 | dev->info = info; |
1677 | info->par = dev; | |
1678 | info->pseudo_palette = dev->pseudo_palette; | |
2469d5db | 1679 | info->fbops = &dlfb_ops; |
59277b67 | 1680 | |
2469d5db BT |
1681 | retval = fb_alloc_cmap(&info->cmap, 256, 0); |
1682 | if (retval < 0) { | |
81f6f3c1 | 1683 | pr_err("fb_alloc_cmap failed %x\n", retval); |
2469d5db BT |
1684 | goto error; |
1685 | } | |
88e58b1a | 1686 | |
33077b8d BT |
1687 | INIT_DELAYED_WORK(&dev->free_framebuffer_work, |
1688 | dlfb_free_framebuffer_work); | |
1689 | ||
18dffdf8 BT |
1690 | INIT_LIST_HEAD(&info->modelist); |
1691 | ||
1692 | retval = dlfb_setup_modes(dev, info, NULL, 0); | |
1693 | if (retval != 0) { | |
81f6f3c1 | 1694 | pr_err("unable to find common mode for display and adapter\n"); |
18dffdf8 BT |
1695 | goto error; |
1696 | } | |
1697 | ||
2469d5db | 1698 | /* ready to begin using device */ |
88e58b1a | 1699 | |
2469d5db BT |
1700 | atomic_set(&dev->usb_active, 1); |
1701 | dlfb_select_std_channel(dev); | |
88e58b1a | 1702 | |
18dffdf8 | 1703 | dlfb_ops_check_var(&info->var, info); |
2469d5db | 1704 | dlfb_ops_set_par(info); |
88e58b1a | 1705 | |
2469d5db | 1706 | retval = register_framebuffer(info); |
59277b67 | 1707 | if (retval < 0) { |
81f6f3c1 | 1708 | pr_err("register_framebuffer failed %d\n", retval); |
2469d5db | 1709 | goto error; |
7316bc55 | 1710 | } |
88e58b1a | 1711 | |
94cd1ae2 LY |
1712 | for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) { |
1713 | retval = device_create_file(info->dev, &fb_device_attrs[i]); | |
1714 | if (retval) { | |
8d21547d | 1715 | pr_warn("device_create_file failed %d\n", retval); |
94cd1ae2 LY |
1716 | } |
1717 | } | |
88e58b1a | 1718 | |
94cd1ae2 LY |
1719 | retval = device_create_bin_file(info->dev, &edid_attr); |
1720 | if (retval) { | |
8d21547d | 1721 | pr_warn("device_create_bin_file failed %d\n", retval); |
94cd1ae2 | 1722 | } |
88e58b1a | 1723 | |
81f6f3c1 | 1724 | pr_info("DisplayLink USB device /dev/fb%d attached. %dx%d resolution." |
2469d5db | 1725 | " Using %dK framebuffer memory\n", info->node, |
18dffdf8 | 1726 | info->var.xres, info->var.yres, |
2469d5db | 1727 | ((dev->backing_buffer) ? |
18dffdf8 | 1728 | info->fix.smem_len * 2 : info->fix.smem_len) >> 10); |
8d21547d | 1729 | return; |
94cd1ae2 | 1730 | |
2469d5db | 1731 | error: |
8d21547d | 1732 | dlfb_free_framebuffer(dev); |
88e58b1a RDI |
1733 | } |
1734 | ||
2469d5db | 1735 | static void dlfb_usb_disconnect(struct usb_interface *interface) |
88e58b1a | 1736 | { |
59277b67 BT |
1737 | struct dlfb_data *dev; |
1738 | struct fb_info *info; | |
2469d5db | 1739 | int i; |
88e58b1a | 1740 | |
59277b67 | 1741 | dev = usb_get_intfdata(interface); |
2469d5db BT |
1742 | info = dev->info; |
1743 | ||
81f6f3c1 | 1744 | pr_info("USB disconnect starting\n"); |
2469d5db | 1745 | |
33077b8d BT |
1746 | /* we virtualize until all fb clients release. Then we free */ |
1747 | dev->virtualized = true; | |
1748 | ||
1749 | /* When non-active we'll update virtual framebuffer, but no new urbs */ | |
1750 | atomic_set(&dev->usb_active, 0); | |
59277b67 | 1751 | |
8d21547d BT |
1752 | /* this function will wait for all in-flight urbs to complete */ |
1753 | dlfb_free_urb_list(dev); | |
1754 | ||
1755 | if (info) { | |
8d21547d BT |
1756 | /* remove udlfb's sysfs interfaces */ |
1757 | for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) | |
1758 | device_remove_file(info->dev, &fb_device_attrs[i]); | |
1759 | device_remove_bin_file(info->dev, &edid_attr); | |
8d21547d BT |
1760 | unlink_framebuffer(info); |
1761 | } | |
1762 | ||
33077b8d | 1763 | usb_set_intfdata(interface, NULL); |
8d21547d BT |
1764 | dev->udev = NULL; |
1765 | dev->gdev = NULL; | |
59277b67 | 1766 | |
33077b8d BT |
1767 | /* if clients still have us open, will be freed on last close */ |
1768 | if (dev->fb_count == 0) | |
1769 | schedule_delayed_work(&dev->free_framebuffer_work, 0); | |
88e58b1a | 1770 | |
2469d5db | 1771 | /* release reference taken by kref_init in probe() */ |
33077b8d | 1772 | kref_put(&dev->kref, dlfb_free); |
88e58b1a | 1773 | |
2469d5db BT |
1774 | /* consider dlfb_data freed */ |
1775 | ||
1776 | return; | |
88e58b1a RDI |
1777 | } |
1778 | ||
1779 | static struct usb_driver dlfb_driver = { | |
1780 | .name = "udlfb", | |
2469d5db BT |
1781 | .probe = dlfb_usb_probe, |
1782 | .disconnect = dlfb_usb_disconnect, | |
88e58b1a RDI |
1783 | .id_table = id_table, |
1784 | }; | |
1785 | ||
fe748483 | 1786 | module_usb_driver(dlfb_driver); |
88e58b1a | 1787 | |
4a4854dd BT |
1788 | static void dlfb_urb_completion(struct urb *urb) |
1789 | { | |
1790 | struct urb_node *unode = urb->context; | |
1791 | struct dlfb_data *dev = unode->dev; | |
1792 | unsigned long flags; | |
1793 | ||
1794 | /* sync/async unlink faults aren't errors */ | |
1795 | if (urb->status) { | |
1796 | if (!(urb->status == -ENOENT || | |
1797 | urb->status == -ECONNRESET || | |
1798 | urb->status == -ESHUTDOWN)) { | |
81f6f3c1 | 1799 | pr_err("%s - nonzero write bulk status received: %d\n", |
4a4854dd BT |
1800 | __func__, urb->status); |
1801 | atomic_set(&dev->lost_pixels, 1); | |
1802 | } | |
1803 | } | |
1804 | ||
1805 | urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */ | |
1806 | ||
1807 | spin_lock_irqsave(&dev->urbs.lock, flags); | |
1808 | list_add_tail(&unode->entry, &dev->urbs.list); | |
1809 | dev->urbs.available++; | |
1810 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1811 | ||
5bea1fbf BT |
1812 | /* |
1813 | * When using fb_defio, we deadlock if up() is called | |
1814 | * while another is waiting. So queue to another process. | |
1815 | */ | |
1816 | if (fb_defio) | |
1817 | schedule_delayed_work(&unode->release_urb_work, 0); | |
1818 | else | |
1819 | up(&dev->urbs.limit_sem); | |
4a4854dd BT |
1820 | } |
1821 | ||
1822 | static void dlfb_free_urb_list(struct dlfb_data *dev) | |
1823 | { | |
1824 | int count = dev->urbs.count; | |
1825 | struct list_head *node; | |
1826 | struct urb_node *unode; | |
1827 | struct urb *urb; | |
1828 | int ret; | |
1829 | unsigned long flags; | |
1830 | ||
8d21547d | 1831 | pr_notice("Freeing all render urbs\n"); |
4a4854dd BT |
1832 | |
1833 | /* keep waiting and freeing, until we've got 'em all */ | |
1834 | while (count--) { | |
33077b8d | 1835 | |
8d21547d | 1836 | /* Getting interrupted means a leak, but ok at disconnect */ |
33077b8d BT |
1837 | ret = down_interruptible(&dev->urbs.limit_sem); |
1838 | if (ret) | |
4a4854dd | 1839 | break; |
33077b8d | 1840 | |
4a4854dd BT |
1841 | spin_lock_irqsave(&dev->urbs.lock, flags); |
1842 | ||
1843 | node = dev->urbs.list.next; /* have reserved one with sem */ | |
1844 | list_del_init(node); | |
1845 | ||
1846 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1847 | ||
1848 | unode = list_entry(node, struct urb_node, entry); | |
1849 | urb = unode->urb; | |
1850 | ||
1851 | /* Free each separately allocated piece */ | |
c220cc3e GKH |
1852 | usb_free_coherent(urb->dev, dev->urbs.size, |
1853 | urb->transfer_buffer, urb->transfer_dma); | |
4a4854dd BT |
1854 | usb_free_urb(urb); |
1855 | kfree(node); | |
1856 | } | |
1857 | ||
8d21547d | 1858 | dev->urbs.count = 0; |
4a4854dd BT |
1859 | } |
1860 | ||
1861 | static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size) | |
1862 | { | |
1863 | int i = 0; | |
1864 | struct urb *urb; | |
1865 | struct urb_node *unode; | |
1866 | char *buf; | |
1867 | ||
1868 | spin_lock_init(&dev->urbs.lock); | |
1869 | ||
1870 | dev->urbs.size = size; | |
1871 | INIT_LIST_HEAD(&dev->urbs.list); | |
1872 | ||
1873 | while (i < count) { | |
1874 | unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL); | |
1875 | if (!unode) | |
1876 | break; | |
1877 | unode->dev = dev; | |
1878 | ||
5bea1fbf BT |
1879 | INIT_DELAYED_WORK(&unode->release_urb_work, |
1880 | dlfb_release_urb_work); | |
1881 | ||
4a4854dd BT |
1882 | urb = usb_alloc_urb(0, GFP_KERNEL); |
1883 | if (!urb) { | |
1884 | kfree(unode); | |
1885 | break; | |
1886 | } | |
1887 | unode->urb = urb; | |
1888 | ||
c220cc3e GKH |
1889 | buf = usb_alloc_coherent(dev->udev, MAX_TRANSFER, GFP_KERNEL, |
1890 | &urb->transfer_dma); | |
4a4854dd BT |
1891 | if (!buf) { |
1892 | kfree(unode); | |
1893 | usb_free_urb(urb); | |
1894 | break; | |
1895 | } | |
1896 | ||
1897 | /* urb->transfer_buffer_length set to actual before submit */ | |
1898 | usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1), | |
1899 | buf, size, dlfb_urb_completion, unode); | |
1900 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
1901 | ||
1902 | list_add_tail(&unode->entry, &dev->urbs.list); | |
1903 | ||
1904 | i++; | |
1905 | } | |
1906 | ||
1907 | sema_init(&dev->urbs.limit_sem, i); | |
1908 | dev->urbs.count = i; | |
1909 | dev->urbs.available = i; | |
1910 | ||
81f6f3c1 | 1911 | pr_notice("allocated %d %d byte urbs\n", i, (int) size); |
4a4854dd BT |
1912 | |
1913 | return i; | |
1914 | } | |
1915 | ||
1916 | static struct urb *dlfb_get_urb(struct dlfb_data *dev) | |
1917 | { | |
1918 | int ret = 0; | |
1919 | struct list_head *entry; | |
1920 | struct urb_node *unode; | |
1921 | struct urb *urb = NULL; | |
1922 | unsigned long flags; | |
1923 | ||
1924 | /* Wait for an in-flight buffer to complete and get re-queued */ | |
1925 | ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT); | |
1926 | if (ret) { | |
1927 | atomic_set(&dev->lost_pixels, 1); | |
81f6f3c1 | 1928 | pr_warn("wait for urb interrupted: %x available: %d\n", |
5bea1fbf | 1929 | ret, dev->urbs.available); |
4a4854dd BT |
1930 | goto error; |
1931 | } | |
1932 | ||
1933 | spin_lock_irqsave(&dev->urbs.lock, flags); | |
1934 | ||
1935 | BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */ | |
1936 | entry = dev->urbs.list.next; | |
1937 | list_del_init(entry); | |
1938 | dev->urbs.available--; | |
1939 | ||
1940 | spin_unlock_irqrestore(&dev->urbs.lock, flags); | |
1941 | ||
1942 | unode = list_entry(entry, struct urb_node, entry); | |
1943 | urb = unode->urb; | |
1944 | ||
1945 | error: | |
1946 | return urb; | |
1947 | } | |
1948 | ||
1949 | static int dlfb_submit_urb(struct dlfb_data *dev, struct urb *urb, size_t len) | |
1950 | { | |
1951 | int ret; | |
1952 | ||
1953 | BUG_ON(len > dev->urbs.size); | |
1954 | ||
1955 | urb->transfer_buffer_length = len; /* set to actual payload len */ | |
1956 | ret = usb_submit_urb(urb, GFP_KERNEL); | |
1957 | if (ret) { | |
1958 | dlfb_urb_completion(urb); /* because no one else will */ | |
1959 | atomic_set(&dev->lost_pixels, 1); | |
81f6f3c1 | 1960 | pr_err("usb_submit_urb error %x\n", ret); |
4a4854dd BT |
1961 | } |
1962 | return ret; | |
1963 | } | |
1964 | ||
d5ed5432 | 1965 | module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); |
4aa7faff | 1966 | MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer"); |
d5ed5432 BT |
1967 | |
1968 | module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); | |
9f811b72 | 1969 | MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes"); |
d5ed5432 | 1970 | |
d3189545 SH |
1971 | module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); |
1972 | MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf"); | |
1973 | ||
664c5f18 BC |
1974 | module_param(pixel_limit, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); |
1975 | MODULE_PARM_DESC(pixel_limit, "Force limit on max mode (in x*y pixels)"); | |
1976 | ||
59277b67 | 1977 | MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, " |
2469d5db BT |
1978 | "Jaya Kumar <jayakumar.lkml@gmail.com>, " |
1979 | "Bernie Thompson <bernie@plugable.com>"); | |
1980 | MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); | |
88e58b1a | 1981 | MODULE_LICENSE("GPL"); |
2469d5db | 1982 |