blob: 68041d9dc2602e263474e7892c24b20c30e151b0 [file] [log] [blame]
Bernie Thompson59277b62009-11-24 15:52:21 -08001/*
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>
Bernie Thompson2469d5d2010-02-15 06:46:13 -08006 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
Bernie Thompson59277b62009-11-24 15:52:21 -08007 *
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 */
Roberto De Ioris88e58b12009-06-03 14:03:06 -070018
Paul Mundt81f6f3c2011-01-06 18:07:54 +090019#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
Roberto De Ioris88e58b12009-06-03 14:03:06 -070021#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>
Amit Kucheriafb299002009-07-27 12:01:03 +030028#include <linux/vmalloc.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090029#include <linux/slab.h>
Bernie Thompson33077b82010-09-05 16:35:19 -070030#include <linux/delay.h>
Paul Mundt96f8d862010-11-16 14:00:24 +090031#include <video/udlfb.h>
Paul Mundtb9f03a32011-01-06 18:04:02 +090032#include "edid.h"
Roberto De Ioris88e58b12009-06-03 14:03:06 -070033
Bernie Thompson59277b62009-11-24 15:52:21 -080034static struct fb_fix_screeninfo dlfb_fix = {
Bernie Thompson2469d5d2010-02-15 06:46:13 -080035 .id = "udlfb",
Bernie Thompson1d31a9e2010-02-15 06:45:43 -080036 .type = FB_TYPE_PACKED_PIXELS,
37 .visual = FB_VISUAL_TRUECOLOR,
38 .xpanstep = 0,
39 .ypanstep = 0,
40 .ywrapstep = 0,
41 .accel = FB_ACCEL_NONE,
Bernie Thompson59277b62009-11-24 15:52:21 -080042};
Roberto De Ioris88e58b12009-06-03 14:03:06 -070043
Bernie Thompson2469d5d2010-02-15 06:46:13 -080044static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST |
Bernie Thompson2469d5d2010-02-15 06:46:13 -080045 FBINFO_VIRTFB |
Bernie Thompson2469d5d2010-02-15 06:46:13 -080046 FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT |
47 FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR;
48
Bernie Thompsoncc403dc2010-02-15 06:45:49 -080049/*
50 * There are many DisplayLink-based products, all with unique PIDs. We are able
51 * to support all volume ones (circa 2009) with a single driver, so we match
52 * globally on VID. TODO: Probe() needs to detect when we might be running
53 * "future" chips, and bail on those, so a compatible driver can match.
54 */
55static struct usb_device_id id_table[] = {
56 {.idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,},
57 {},
58};
59MODULE_DEVICE_TABLE(usb, id_table);
Bernie Thompson59277b62009-11-24 15:52:21 -080060
Bernie Thompsond5ed5432010-09-05 16:35:39 -070061/* module options */
62static int console; /* Optionally allow fbcon to consume first framebuffer */
63static int fb_defio; /* Optionally enable experimental fb_defio mmap support */
Bernie Thompsondd8015f2010-02-15 06:46:35 -080064
Bernie Thompson4a4854d2010-02-15 06:45:55 -080065/* dlfb keeps a list of urbs for efficient bulk transfers */
66static void dlfb_urb_completion(struct urb *urb);
67static struct urb *dlfb_get_urb(struct dlfb_data *dev);
68static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len);
69static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size);
70static void dlfb_free_urb_list(struct dlfb_data *dev);
71
Bernie Thompson59277b62009-11-24 15:52:21 -080072/*
Bernie Thompsonbd808162010-02-15 06:46:48 -080073 * All DisplayLink bulk operations start with 0xAF, followed by specific code
74 * All operations are written to buffers which then later get sent to device
Bernie Thompson59277b62009-11-24 15:52:21 -080075 */
Bernie Thompson45742032010-02-15 06:46:04 -080076static char *dlfb_set_register(char *buf, u8 reg, u8 val)
Roberto De Ioris88e58b12009-06-03 14:03:06 -070077{
Bernie Thompson1d31a9e2010-02-15 06:45:43 -080078 *buf++ = 0xAF;
79 *buf++ = 0x20;
80 *buf++ = reg;
81 *buf++ = val;
82 return buf;
Roberto De Ioris88e58b12009-06-03 14:03:06 -070083}
84
Bernie Thompson45742032010-02-15 06:46:04 -080085static char *dlfb_vidreg_lock(char *buf)
Roberto De Ioris88e58b12009-06-03 14:03:06 -070086{
Bernie Thompson45742032010-02-15 06:46:04 -080087 return dlfb_set_register(buf, 0xFF, 0x00);
Bernie Thompson59277b62009-11-24 15:52:21 -080088}
Roberto De Ioris88e58b12009-06-03 14:03:06 -070089
Bernie Thompson45742032010-02-15 06:46:04 -080090static char *dlfb_vidreg_unlock(char *buf)
Bernie Thompson59277b62009-11-24 15:52:21 -080091{
Bernie Thompson45742032010-02-15 06:46:04 -080092 return dlfb_set_register(buf, 0xFF, 0xFF);
Bernie Thompson59277b62009-11-24 15:52:21 -080093}
Roberto De Ioris88e58b12009-06-03 14:03:06 -070094
Bernie Thompson59277b62009-11-24 15:52:21 -080095/*
Bernie Thompson530f43a2010-02-15 06:46:21 -080096 * On/Off for driving the DisplayLink framebuffer to the display
Bernie Thompson9825f702010-09-05 16:35:10 -070097 * 0x00 H and V sync on
98 * 0x01 H and V sync off (screen blank but powered)
99 * 0x07 DPMS powerdown (requires modeset to come back)
Bernie Thompson59277b62009-11-24 15:52:21 -0800100 */
Bernie Thompson530f43a2010-02-15 06:46:21 -0800101static char *dlfb_enable_hvsync(char *buf, bool enable)
Bernie Thompson59277b62009-11-24 15:52:21 -0800102{
Bernie Thompson530f43a2010-02-15 06:46:21 -0800103 if (enable)
104 return dlfb_set_register(buf, 0x1F, 0x00);
105 else
Bernie Thompson9825f702010-09-05 16:35:10 -0700106 return dlfb_set_register(buf, 0x1F, 0x07);
Bernie Thompson59277b62009-11-24 15:52:21 -0800107}
108
Bernie Thompson45742032010-02-15 06:46:04 -0800109static char *dlfb_set_color_depth(char *buf, u8 selection)
Bernie Thompson59277b62009-11-24 15:52:21 -0800110{
Bernie Thompson45742032010-02-15 06:46:04 -0800111 return dlfb_set_register(buf, 0x00, selection);
Bernie Thompson59277b62009-11-24 15:52:21 -0800112}
113
Bernie Thompson45742032010-02-15 06:46:04 -0800114static char *dlfb_set_base16bpp(char *wrptr, u32 base)
Bernie Thompson59277b62009-11-24 15:52:21 -0800115{
Bernie Thompson1d31a9e2010-02-15 06:45:43 -0800116 /* the base pointer is 16 bits wide, 0x20 is hi byte. */
Bernie Thompson45742032010-02-15 06:46:04 -0800117 wrptr = dlfb_set_register(wrptr, 0x20, base >> 16);
118 wrptr = dlfb_set_register(wrptr, 0x21, base >> 8);
119 return dlfb_set_register(wrptr, 0x22, base);
Bernie Thompson59277b62009-11-24 15:52:21 -0800120}
121
Bernie Thompsonbd808162010-02-15 06:46:48 -0800122/*
123 * DisplayLink HW has separate 16bpp and 8bpp framebuffers.
124 * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
125 */
Bernie Thompson45742032010-02-15 06:46:04 -0800126static char *dlfb_set_base8bpp(char *wrptr, u32 base)
Bernie Thompson59277b62009-11-24 15:52:21 -0800127{
Bernie Thompson45742032010-02-15 06:46:04 -0800128 wrptr = dlfb_set_register(wrptr, 0x26, base >> 16);
129 wrptr = dlfb_set_register(wrptr, 0x27, base >> 8);
130 return dlfb_set_register(wrptr, 0x28, base);
Bernie Thompson59277b62009-11-24 15:52:21 -0800131}
132
Bernie Thompson45742032010-02-15 06:46:04 -0800133static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value)
Bernie Thompson59277b62009-11-24 15:52:21 -0800134{
Bernie Thompson45742032010-02-15 06:46:04 -0800135 wrptr = dlfb_set_register(wrptr, reg, value >> 8);
136 return dlfb_set_register(wrptr, reg+1, value);
Bernie Thompson59277b62009-11-24 15:52:21 -0800137}
138
139/*
140 * This is kind of weird because the controller takes some
141 * register values in a different byte order than other registers.
142 */
Bernie Thompson45742032010-02-15 06:46:04 -0800143static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value)
Bernie Thompson59277b62009-11-24 15:52:21 -0800144{
Bernie Thompson45742032010-02-15 06:46:04 -0800145 wrptr = dlfb_set_register(wrptr, reg, value);
146 return dlfb_set_register(wrptr, reg+1, value >> 8);
Bernie Thompson59277b62009-11-24 15:52:21 -0800147}
148
149/*
150 * LFSR is linear feedback shift register. The reason we have this is
151 * because the display controller needs to minimize the clock depth of
152 * various counters used in the display path. So this code reverses the
153 * provided value into the lfsr16 value by counting backwards to get
154 * the value that needs to be set in the hardware comparator to get the
155 * same actual count. This makes sense once you read above a couple of
156 * times and think about it from a hardware perspective.
157 */
Bernie Thompsonbd808162010-02-15 06:46:48 -0800158static u16 dlfb_lfsr16(u16 actual_count)
Bernie Thompson59277b62009-11-24 15:52:21 -0800159{
160 u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */
161
162 while (actual_count--) {
163 lv = ((lv << 1) |
164 (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1))
165 & 0xFFFF;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700166 }
Bernie Thompson59277b62009-11-24 15:52:21 -0800167
168 return (u16) lv;
169}
170
171/*
172 * This does LFSR conversion on the value that is to be written.
173 * See LFSR explanation above for more detail.
174 */
Bernie Thompson45742032010-02-15 06:46:04 -0800175static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value)
Bernie Thompson59277b62009-11-24 15:52:21 -0800176{
Bernie Thompsonbd808162010-02-15 06:46:48 -0800177 return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value));
Bernie Thompson59277b62009-11-24 15:52:21 -0800178}
179
180/*
181 * This takes a standard fbdev screeninfo struct and all of its monitor mode
182 * details and converts them into the DisplayLink equivalent register commands.
183 */
Bernie Thompson45742032010-02-15 06:46:04 -0800184static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var)
Bernie Thompson59277b62009-11-24 15:52:21 -0800185{
186 u16 xds, yds;
187 u16 xde, yde;
188 u16 yec;
189
Bernie Thompson59277b62009-11-24 15:52:21 -0800190 /* x display start */
191 xds = var->left_margin + var->hsync_len;
Bernie Thompson45742032010-02-15 06:46:04 -0800192 wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds);
Bernie Thompson59277b62009-11-24 15:52:21 -0800193 /* x display end */
194 xde = xds + var->xres;
Bernie Thompson45742032010-02-15 06:46:04 -0800195 wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde);
Bernie Thompson59277b62009-11-24 15:52:21 -0800196
197 /* y display start */
198 yds = var->upper_margin + var->vsync_len;
Bernie Thompson45742032010-02-15 06:46:04 -0800199 wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds);
Bernie Thompson59277b62009-11-24 15:52:21 -0800200 /* y display end */
201 yde = yds + var->yres;
Bernie Thompson45742032010-02-15 06:46:04 -0800202 wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde);
Bernie Thompson59277b62009-11-24 15:52:21 -0800203
204 /* x end count is active + blanking - 1 */
Bernie Thompson45742032010-02-15 06:46:04 -0800205 wrptr = dlfb_set_register_lfsr16(wrptr, 0x09,
206 xde + var->right_margin - 1);
Bernie Thompson59277b62009-11-24 15:52:21 -0800207
208 /* libdlo hardcodes hsync start to 1 */
Bernie Thompson45742032010-02-15 06:46:04 -0800209 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1);
Bernie Thompson59277b62009-11-24 15:52:21 -0800210
211 /* hsync end is width of sync pulse + 1 */
Bernie Thompson45742032010-02-15 06:46:04 -0800212 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1);
Bernie Thompson59277b62009-11-24 15:52:21 -0800213
214 /* hpixels is active pixels */
Bernie Thompson45742032010-02-15 06:46:04 -0800215 wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres);
Bernie Thompson59277b62009-11-24 15:52:21 -0800216
217 /* yendcount is vertical active + vertical blanking */
218 yec = var->yres + var->upper_margin + var->lower_margin +
219 var->vsync_len;
Bernie Thompson45742032010-02-15 06:46:04 -0800220 wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec);
Bernie Thompson59277b62009-11-24 15:52:21 -0800221
222 /* libdlo hardcodes vsync start to 0 */
Bernie Thompson45742032010-02-15 06:46:04 -0800223 wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0);
Bernie Thompson59277b62009-11-24 15:52:21 -0800224
225 /* vsync end is width of vsync pulse */
Bernie Thompson45742032010-02-15 06:46:04 -0800226 wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len);
Bernie Thompson59277b62009-11-24 15:52:21 -0800227
228 /* vpixels is active pixels */
Bernie Thompson45742032010-02-15 06:46:04 -0800229 wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres);
Bernie Thompson59277b62009-11-24 15:52:21 -0800230
231 /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */
Bernie Thompson45742032010-02-15 06:46:04 -0800232 wrptr = dlfb_set_register_16be(wrptr, 0x1B,
233 200*1000*1000/var->pixclock);
Bernie Thompson59277b62009-11-24 15:52:21 -0800234
235 return wrptr;
236}
237
238/*
239 * This takes a standard fbdev screeninfo struct that was fetched or prepared
240 * and then generates the appropriate command sequence that then drives the
241 * display controller.
242 */
243static int dlfb_set_video_mode(struct dlfb_data *dev,
244 struct fb_var_screeninfo *var)
245{
246 char *buf;
247 char *wrptr;
248 int retval = 0;
249 int writesize;
Bernie Thompson530f43a2010-02-15 06:46:21 -0800250 struct urb *urb;
Bernie Thompson59277b62009-11-24 15:52:21 -0800251
Bernie Thompson530f43a2010-02-15 06:46:21 -0800252 if (!atomic_read(&dev->usb_active))
253 return -EPERM;
254
255 urb = dlfb_get_urb(dev);
256 if (!urb)
257 return -ENOMEM;
Bernie Thompson2685cff2010-09-05 18:29:56 -0700258
Bernie Thompson530f43a2010-02-15 06:46:21 -0800259 buf = (char *) urb->transfer_buffer;
Bernie Thompson59277b62009-11-24 15:52:21 -0800260
261 /*
262 * This first section has to do with setting the base address on the
263 * controller * associated with the display. There are 2 base
264 * pointers, currently, we only * use the 16 bpp segment.
265 */
Bernie Thompson45742032010-02-15 06:46:04 -0800266 wrptr = dlfb_vidreg_lock(buf);
267 wrptr = dlfb_set_color_depth(wrptr, 0x00);
Bernie Thompson59277b62009-11-24 15:52:21 -0800268 /* set base for 16bpp segment to 0 */
Bernie Thompson45742032010-02-15 06:46:04 -0800269 wrptr = dlfb_set_base16bpp(wrptr, 0);
Bernie Thompson59277b62009-11-24 15:52:21 -0800270 /* set base for 8bpp segment to end of fb */
Bernie Thompson45742032010-02-15 06:46:04 -0800271 wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len);
Bernie Thompson59277b62009-11-24 15:52:21 -0800272
Bernie Thompson45742032010-02-15 06:46:04 -0800273 wrptr = dlfb_set_vid_cmds(wrptr, var);
Bernie Thompson530f43a2010-02-15 06:46:21 -0800274 wrptr = dlfb_enable_hvsync(wrptr, true);
Bernie Thompson45742032010-02-15 06:46:04 -0800275 wrptr = dlfb_vidreg_unlock(wrptr);
Bernie Thompson59277b62009-11-24 15:52:21 -0800276
277 writesize = wrptr - buf;
278
Bernie Thompson530f43a2010-02-15 06:46:21 -0800279 retval = dlfb_submit_urb(dev, urb, writesize);
Bernie Thompson59277b62009-11-24 15:52:21 -0800280
Bernie Thompson59277b62009-11-24 15:52:21 -0800281 return retval;
282}
283
Bernie Thompson45742032010-02-15 06:46:04 -0800284static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700285{
286 unsigned long start = vma->vm_start;
287 unsigned long size = vma->vm_end - vma->vm_start;
288 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
289 unsigned long page, pos;
290
Greg Kroah-Hartmanf05e0572009-06-03 14:47:08 -0700291 if (offset + size > info->fix.smem_len)
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700292 return -EINVAL;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700293
294 pos = (unsigned long)info->fix.smem_start + offset;
295
Paul Mundt81f6f3c2011-01-06 18:07:54 +0900296 pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
Bernie Thompson2685cff2010-09-05 18:29:56 -0700297 pos, size);
298
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700299 while (size > 0) {
300 page = vmalloc_to_pfn((void *)pos);
Greg Kroah-Hartmanf05e0572009-06-03 14:47:08 -0700301 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700302 return -EAGAIN;
Greg Kroah-Hartmanf05e0572009-06-03 14:47:08 -0700303
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700304 start += PAGE_SIZE;
305 pos += PAGE_SIZE;
306 if (size > PAGE_SIZE)
307 size -= PAGE_SIZE;
308 else
309 size = 0;
310 }
311
312 vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
313 return 0;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700314}
315
Bernie Thompson530f43a2010-02-15 06:46:21 -0800316/*
317 * Trims identical data from front and back of line
318 * Sets new front buffer address and width
319 * And returns byte count of identical pixels
320 * Assumes CPU natural alignment (unsigned long)
321 * for back and front buffer ptrs and width
322 */
323static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes)
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700324{
Bernie Thompson530f43a2010-02-15 06:46:21 -0800325 int j, k;
326 const unsigned long *back = (const unsigned long *) bback;
327 const unsigned long *front = (const unsigned long *) *bfront;
328 const int width = *width_bytes / sizeof(unsigned long);
329 int identical = width;
330 int start = width;
331 int end = width;
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700332
Bernie Thompson530f43a2010-02-15 06:46:21 -0800333 prefetch((void *) front);
334 prefetch((void *) back);
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700335
Bernie Thompson530f43a2010-02-15 06:46:21 -0800336 for (j = 0; j < width; j++) {
337 if (back[j] != front[j]) {
338 start = j;
339 break;
340 }
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700341 }
342
Bernie Thompson530f43a2010-02-15 06:46:21 -0800343 for (k = width - 1; k > j; k--) {
344 if (back[k] != front[k]) {
345 end = k+1;
346 break;
347 }
348 }
349
350 identical = start + (width - end);
351 *bfront = (u8 *) &front[start];
352 *width_bytes = (end - start) * sizeof(unsigned long);
353
354 return identical * sizeof(unsigned long);
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700355}
356
357/*
Pavel Machek3b7b31f2010-04-03 07:00:37 +0200358 * Render a command stream for an encoded horizontal line segment of pixels.
359 *
360 * A command buffer holds several commands.
361 * It always begins with a fresh command header
362 * (the protocol doesn't require this, but we enforce it to allow
363 * multiple buffers to be potentially encoded and sent in parallel).
364 * A single command encodes one contiguous horizontal line of pixels
365 *
366 * The function relies on the client to do all allocation, so that
367 * rendering can be done directly to output buffers (e.g. USB URBs).
368 * The function fills the supplied command buffer, providing information
369 * on where it left off, so the client may call in again with additional
370 * buffers if the line will take several buffers to complete.
371 *
372 * A single command can transmit a maximum of 256 pixels,
373 * regardless of the compression ratio (protocol design limit).
374 * To the hardware, 0 for a size byte means 256
Bernie Thompson2685cff2010-09-05 18:29:56 -0700375 *
Pavel Machek3b7b31f2010-04-03 07:00:37 +0200376 * Rather than 256 pixel commands which are either rl or raw encoded,
377 * the rlx command simply assumes alternating raw and rl spans within one cmd.
378 * This has a slightly larger header overhead, but produces more even results.
379 * It also processes all data (read and write) in a single pass.
380 * Performance benchmarks of common cases show it having just slightly better
Bernie Thompson2685cff2010-09-05 18:29:56 -0700381 * compression than 256 pixel raw or rle commands, with similar CPU consumpion.
Pavel Machek3b7b31f2010-04-03 07:00:37 +0200382 * But for very rl friendly data, will compress not quite as well.
383 */
Bernie Thompson530f43a2010-02-15 06:46:21 -0800384static void dlfb_compress_hline(
385 const uint16_t **pixel_start_ptr,
386 const uint16_t *const pixel_end,
387 uint32_t *device_address_ptr,
388 uint8_t **command_buffer_ptr,
389 const uint8_t *const cmd_buffer_end)
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700390{
Bernie Thompson530f43a2010-02-15 06:46:21 -0800391 const uint16_t *pixel = *pixel_start_ptr;
392 uint32_t dev_addr = *device_address_ptr;
393 uint8_t *cmd = *command_buffer_ptr;
394 const int bpp = 2;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700395
Bernie Thompson530f43a2010-02-15 06:46:21 -0800396 while ((pixel_end > pixel) &&
397 (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) {
398 uint8_t *raw_pixels_count_byte = 0;
399 uint8_t *cmd_pixels_count_byte = 0;
400 const uint16_t *raw_pixel_start = 0;
401 const uint16_t *cmd_pixel_start, *cmd_pixel_end = 0;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700402
Bernie Thompson530f43a2010-02-15 06:46:21 -0800403 prefetchw((void *) cmd); /* pull in one cache line at least */
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700404
Bernie Thompson530f43a2010-02-15 06:46:21 -0800405 *cmd++ = 0xAF;
406 *cmd++ = 0x6B;
Bernie Thompson1572f912010-09-05 16:35:27 -0700407 *cmd++ = (uint8_t) ((dev_addr >> 16) & 0xFF);
408 *cmd++ = (uint8_t) ((dev_addr >> 8) & 0xFF);
409 *cmd++ = (uint8_t) ((dev_addr) & 0xFF);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700410
Bernie Thompson530f43a2010-02-15 06:46:21 -0800411 cmd_pixels_count_byte = cmd++; /* we'll know this later */
412 cmd_pixel_start = pixel;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700413
Bernie Thompson530f43a2010-02-15 06:46:21 -0800414 raw_pixels_count_byte = cmd++; /* we'll know this later */
415 raw_pixel_start = pixel;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700416
Bernie Thompson530f43a2010-02-15 06:46:21 -0800417 cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1,
418 min((int)(pixel_end - pixel),
419 (int)(cmd_buffer_end - cmd) / bpp));
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700420
Bernie Thompson530f43a2010-02-15 06:46:21 -0800421 prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700422
Bernie Thompson530f43a2010-02-15 06:46:21 -0800423 while (pixel < cmd_pixel_end) {
424 const uint16_t * const repeating_pixel = pixel;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700425
Bernie Thompson530f43a2010-02-15 06:46:21 -0800426 *(uint16_t *)cmd = cpu_to_be16p(pixel);
427 cmd += 2;
428 pixel++;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700429
Bernie Thompson530f43a2010-02-15 06:46:21 -0800430 if (unlikely((pixel < cmd_pixel_end) &&
431 (*pixel == *repeating_pixel))) {
432 /* go back and fill in raw pixel count */
433 *raw_pixels_count_byte = ((repeating_pixel -
434 raw_pixel_start) + 1) & 0xFF;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700435
Bernie Thompson530f43a2010-02-15 06:46:21 -0800436 while ((pixel < cmd_pixel_end)
437 && (*pixel == *repeating_pixel)) {
438 pixel++;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700439 }
Bernie Thompson59277b62009-11-24 15:52:21 -0800440
Bernie Thompson530f43a2010-02-15 06:46:21 -0800441 /* immediately after raw data is repeat byte */
442 *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF;
Bernie Thompson59277b62009-11-24 15:52:21 -0800443
Bernie Thompson530f43a2010-02-15 06:46:21 -0800444 /* Then start another raw pixel span */
445 raw_pixel_start = pixel;
446 raw_pixels_count_byte = cmd++;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700447 }
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700448 }
449
Bernie Thompson530f43a2010-02-15 06:46:21 -0800450 if (pixel > raw_pixel_start) {
451 /* finalize last RAW span */
452 *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF;
453 }
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700454
Bernie Thompson530f43a2010-02-15 06:46:21 -0800455 *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF;
456 dev_addr += (pixel - cmd_pixel_start) * bpp;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700457 }
458
Bernie Thompson530f43a2010-02-15 06:46:21 -0800459 if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) {
460 /* Fill leftover bytes with no-ops */
461 if (cmd_buffer_end > cmd)
462 memset(cmd, 0xAF, cmd_buffer_end - cmd);
463 cmd = (uint8_t *) cmd_buffer_end;
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700464 }
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700465
Bernie Thompson530f43a2010-02-15 06:46:21 -0800466 *command_buffer_ptr = cmd;
467 *pixel_start_ptr = pixel;
468 *device_address_ptr = dev_addr;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700469
Bernie Thompson530f43a2010-02-15 06:46:21 -0800470 return;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700471}
472
Bernie Thompson530f43a2010-02-15 06:46:21 -0800473/*
474 * There are 3 copies of every pixel: The front buffer that the fbdev
475 * client renders to, the actual framebuffer across the USB bus in hardware
476 * (that we can only write to, slowly, and can never read), and (optionally)
477 * our shadow copy that tracks what's been sent to that hardware buffer.
478 */
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700479static int dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr,
Bernie Thompson530f43a2010-02-15 06:46:21 -0800480 const char *front, char **urb_buf_ptr,
481 u32 byte_offset, u32 byte_width,
482 int *ident_ptr, int *sent_ptr)
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700483{
Bernie Thompson530f43a2010-02-15 06:46:21 -0800484 const u8 *line_start, *line_end, *next_pixel;
485 u32 dev_addr = dev->base16 + byte_offset;
486 struct urb *urb = *urb_ptr;
487 u8 *cmd = *urb_buf_ptr;
488 u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700489
Bernie Thompson530f43a2010-02-15 06:46:21 -0800490 line_start = (u8 *) (front + byte_offset);
491 next_pixel = line_start;
492 line_end = next_pixel + byte_width;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700493
Bernie Thompson530f43a2010-02-15 06:46:21 -0800494 if (dev->backing_buffer) {
495 int offset;
496 const u8 *back_start = (u8 *) (dev->backing_buffer
497 + byte_offset);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700498
Bernie Thompson530f43a2010-02-15 06:46:21 -0800499 *ident_ptr += dlfb_trim_hline(back_start, &next_pixel,
500 &byte_width);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700501
Bernie Thompson530f43a2010-02-15 06:46:21 -0800502 offset = next_pixel - line_start;
503 line_end = next_pixel + byte_width;
504 dev_addr += offset;
505 back_start += offset;
506 line_start += offset;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700507
Bernie Thompson530f43a2010-02-15 06:46:21 -0800508 memcpy((char *)back_start, (char *) line_start,
509 byte_width);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700510 }
511
Bernie Thompson530f43a2010-02-15 06:46:21 -0800512 while (next_pixel < line_end) {
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700513
Bernie Thompson530f43a2010-02-15 06:46:21 -0800514 dlfb_compress_hline((const uint16_t **) &next_pixel,
515 (const uint16_t *) line_end, &dev_addr,
516 (u8 **) &cmd, (u8 *) cmd_end);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700517
Bernie Thompson530f43a2010-02-15 06:46:21 -0800518 if (cmd >= cmd_end) {
519 int len = cmd - (u8 *) urb->transfer_buffer;
520 if (dlfb_submit_urb(dev, urb, len))
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700521 return 1; /* lost pixels is set */
Bernie Thompson530f43a2010-02-15 06:46:21 -0800522 *sent_ptr += len;
523 urb = dlfb_get_urb(dev);
524 if (!urb)
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700525 return 1; /* lost_pixels is set */
Bernie Thompson530f43a2010-02-15 06:46:21 -0800526 *urb_ptr = urb;
527 cmd = urb->transfer_buffer;
528 cmd_end = &cmd[urb->transfer_buffer_length];
529 }
530 }
531
532 *urb_buf_ptr = cmd;
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700533
534 return 0;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700535}
536
Bernie Thompson530f43a2010-02-15 06:46:21 -0800537int dlfb_handle_damage(struct dlfb_data *dev, int x, int y,
538 int width, int height, char *data)
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700539{
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700540 int i, ret;
Bernie Thompson530f43a2010-02-15 06:46:21 -0800541 char *cmd;
542 cycles_t start_cycles, end_cycles;
543 int bytes_sent = 0;
544 int bytes_identical = 0;
545 struct urb *urb;
546 int aligned_x;
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700547
Bernie Thompson530f43a2010-02-15 06:46:21 -0800548 start_cycles = get_cycles();
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700549
Bernie Thompson530f43a2010-02-15 06:46:21 -0800550 aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
551 width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
552 x = aligned_x;
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700553
Bernie Thompson530f43a2010-02-15 06:46:21 -0800554 if ((width <= 0) ||
555 (x + width > dev->info->var.xres) ||
556 (y + height > dev->info->var.yres))
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700557 return -EINVAL;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700558
Bernie Thompson530f43a2010-02-15 06:46:21 -0800559 if (!atomic_read(&dev->usb_active))
560 return 0;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700561
Bernie Thompson530f43a2010-02-15 06:46:21 -0800562 urb = dlfb_get_urb(dev);
563 if (!urb)
564 return 0;
565 cmd = urb->transfer_buffer;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700566
Bernie Thompson530f43a2010-02-15 06:46:21 -0800567 for (i = y; i < y + height ; i++) {
568 const int line_offset = dev->info->fix.line_length * i;
569 const int byte_offset = line_offset + (x * BPP);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700570
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700571 if (dlfb_render_hline(dev, &urb,
572 (char *) dev->info->fix.smem_start,
Bernie Thompson2685cff2010-09-05 18:29:56 -0700573 &cmd, byte_offset, width * BPP,
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700574 &bytes_identical, &bytes_sent))
575 goto error;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700576 }
577
Bernie Thompson530f43a2010-02-15 06:46:21 -0800578 if (cmd > (char *) urb->transfer_buffer) {
579 /* Send partial buffer remaining before exiting */
580 int len = cmd - (char *) urb->transfer_buffer;
581 ret = dlfb_submit_urb(dev, urb, len);
582 bytes_sent += len;
583 } else
584 dlfb_urb_completion(urb);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700585
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700586error:
Bernie Thompson530f43a2010-02-15 06:46:21 -0800587 atomic_add(bytes_sent, &dev->bytes_sent);
588 atomic_add(bytes_identical, &dev->bytes_identical);
589 atomic_add(width*height*2, &dev->bytes_rendered);
590 end_cycles = get_cycles();
591 atomic_add(((unsigned int) ((end_cycles - start_cycles)
592 >> 10)), /* Kcycles */
593 &dev->cpu_kcycles_used);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700594
Bernie Thompson530f43a2010-02-15 06:46:21 -0800595 return 0;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700596}
597
Bernie Thompsond46ecb92010-09-05 16:35:04 -0700598/*
599 * Path triggered by usermode clients who write to filesystem
600 * e.g. cat filename > /dev/fb1
601 * Not used by X Windows or text-mode console. But useful for testing.
602 * Slow because of extra copy and we must assume all pixels dirty.
603 */
604static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf,
605 size_t count, loff_t *ppos)
606{
Paul Mundt1a3e5282011-01-06 17:29:24 +0900607 ssize_t result;
Bernie Thompsond46ecb92010-09-05 16:35:04 -0700608 struct dlfb_data *dev = info->par;
609 u32 offset = (u32) *ppos;
610
Bernie Thompsond46ecb92010-09-05 16:35:04 -0700611 result = fb_sys_write(info, buf, count, ppos);
612
613 if (result > 0) {
614 int start = max((int)(offset / info->fix.line_length) - 1, 0);
615 int lines = min((u32)((result / info->fix.line_length) + 1),
616 (u32)info->var.yres);
617
618 dlfb_handle_damage(dev, 0, start, info->var.xres,
619 lines, info->screen_base);
620 }
Bernie Thompsond46ecb92010-09-05 16:35:04 -0700621
622 return result;
623}
624
Bernie Thompson530f43a2010-02-15 06:46:21 -0800625/* hardware has native COPY command (see libdlo), but not worth it for fbcon */
Bernie Thompson45742032010-02-15 06:46:04 -0800626static void dlfb_ops_copyarea(struct fb_info *info,
Bernie Thompson530f43a2010-02-15 06:46:21 -0800627 const struct fb_copyarea *area)
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700628{
Bernie Thompson530f43a2010-02-15 06:46:21 -0800629
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700630 struct dlfb_data *dev = info->par;
631
Bernie Thompson530f43a2010-02-15 06:46:21 -0800632 sys_copyarea(info, area);
633
634 dlfb_handle_damage(dev, area->dx, area->dy,
635 area->width, area->height, info->screen_base);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700636}
637
Bernie Thompson45742032010-02-15 06:46:04 -0800638static void dlfb_ops_imageblit(struct fb_info *info,
Bernie Thompson530f43a2010-02-15 06:46:21 -0800639 const struct fb_image *image)
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700640{
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700641 struct dlfb_data *dev = info->par;
Bernie Thompson530f43a2010-02-15 06:46:21 -0800642
Bernie Thompson530f43a2010-02-15 06:46:21 -0800643 sys_imageblit(info, image);
644
645 dlfb_handle_damage(dev, image->dx, image->dy,
646 image->width, image->height, info->screen_base);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700647}
648
Bernie Thompson45742032010-02-15 06:46:04 -0800649static void dlfb_ops_fillrect(struct fb_info *info,
Bernie Thompson530f43a2010-02-15 06:46:21 -0800650 const struct fb_fillrect *rect)
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700651{
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700652 struct dlfb_data *dev = info->par;
653
Bernie Thompson530f43a2010-02-15 06:46:21 -0800654 sys_fillrect(info, rect);
655
656 dlfb_handle_damage(dev, rect->dx, rect->dy, rect->width,
657 rect->height, info->screen_base);
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700658}
659
Bernie Thompsond5ed5432010-09-05 16:35:39 -0700660/*
661 * NOTE: fb_defio.c is holding info->fbdefio.mutex
662 * Touching ANY framebuffer memory that triggers a page fault
663 * in fb_defio will cause a deadlock, when it also tries to
664 * grab the same mutex.
665 */
666static void dlfb_dpy_deferred_io(struct fb_info *info,
667 struct list_head *pagelist)
668{
669 struct page *cur;
670 struct fb_deferred_io *fbdefio = info->fbdefio;
671 struct dlfb_data *dev = info->par;
672 struct urb *urb;
673 char *cmd;
674 cycles_t start_cycles, end_cycles;
675 int bytes_sent = 0;
676 int bytes_identical = 0;
677 int bytes_rendered = 0;
678
679 if (!fb_defio)
680 return;
681
682 if (!atomic_read(&dev->usb_active))
683 return;
684
685 start_cycles = get_cycles();
686
687 urb = dlfb_get_urb(dev);
688 if (!urb)
689 return;
690
691 cmd = urb->transfer_buffer;
692
693 /* walk the written page list and render each to device */
694 list_for_each_entry(cur, &fbdefio->pagelist, lru) {
695
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700696 if (dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start,
Bernie Thompsond5ed5432010-09-05 16:35:39 -0700697 &cmd, cur->index << PAGE_SHIFT,
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700698 PAGE_SIZE, &bytes_identical, &bytes_sent))
699 goto error;
Bernie Thompsond5ed5432010-09-05 16:35:39 -0700700 bytes_rendered += PAGE_SIZE;
701 }
702
703 if (cmd > (char *) urb->transfer_buffer) {
704 /* Send partial buffer remaining before exiting */
705 int len = cmd - (char *) urb->transfer_buffer;
706 dlfb_submit_urb(dev, urb, len);
707 bytes_sent += len;
708 } else
709 dlfb_urb_completion(urb);
710
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700711error:
Bernie Thompsond5ed5432010-09-05 16:35:39 -0700712 atomic_add(bytes_sent, &dev->bytes_sent);
713 atomic_add(bytes_identical, &dev->bytes_identical);
714 atomic_add(bytes_rendered, &dev->bytes_rendered);
715 end_cycles = get_cycles();
716 atomic_add(((unsigned int) ((end_cycles - start_cycles)
717 >> 10)), /* Kcycles */
718 &dev->cpu_kcycles_used);
719}
720
Bernie Thompson18dffdf2010-09-05 16:35:23 -0700721static int dlfb_get_edid(struct dlfb_data *dev, char *edid, int len)
Bernie Thompson7d9485e2010-02-15 06:46:08 -0800722{
723 int i;
724 int ret;
Bernie Thompson18dffdf2010-09-05 16:35:23 -0700725 char *rbuf;
Bernie Thompson7d9485e2010-02-15 06:46:08 -0800726
Bernie Thompson18dffdf2010-09-05 16:35:23 -0700727 rbuf = kmalloc(2, GFP_KERNEL);
728 if (!rbuf)
729 return 0;
730
731 for (i = 0; i < len; i++) {
Bernie Thompson7d9485e2010-02-15 06:46:08 -0800732 ret = usb_control_msg(dev->udev,
733 usb_rcvctrlpipe(dev->udev, 0), (0x02),
734 (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
Bernie Thompson18dffdf2010-09-05 16:35:23 -0700735 HZ);
736 if (ret < 1) {
Paul Mundt81f6f3c2011-01-06 18:07:54 +0900737 pr_err("Read EDID byte %d failed err %x\n", i, ret);
Bernie Thompson18dffdf2010-09-05 16:35:23 -0700738 i--;
739 break;
740 }
741 edid[i] = rbuf[1];
Bernie Thompson7d9485e2010-02-15 06:46:08 -0800742 }
Bernie Thompson18dffdf2010-09-05 16:35:23 -0700743
744 kfree(rbuf);
745
746 return i;
Bernie Thompson7d9485e2010-02-15 06:46:08 -0800747}
748
Bernie Thompson45742032010-02-15 06:46:04 -0800749static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd,
Bernie Thompson530f43a2010-02-15 06:46:21 -0800750 unsigned long arg)
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700751{
Bernie Thompson530f43a2010-02-15 06:46:21 -0800752
753 struct dlfb_data *dev = info->par;
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700754 struct dloarea *area = NULL;
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700755
Bernie Thompson530f43a2010-02-15 06:46:21 -0800756 if (!atomic_read(&dev->usb_active))
757 return 0;
758
759 /* TODO: Update X server to get this from sysfs instead */
760 if (cmd == DLFB_IOCTL_RETURN_EDID) {
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700761 char *edid = (char *)arg;
Bernie Thompson18dffdf2010-09-05 16:35:23 -0700762 if (copy_to_user(edid, dev->edid, dev->edid_size))
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700763 return -EFAULT;
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700764 return 0;
765 }
766
Bernie Thompson530f43a2010-02-15 06:46:21 -0800767 /* TODO: Help propose a standard fb.h ioctl to report mmap damage */
768 if (cmd == DLFB_IOCTL_REPORT_DAMAGE) {
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700769
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700770 /*
771 * If we have a damage-aware client, turn fb_defio "off"
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300772 * To avoid perf imact of unnecessary page fault handling.
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700773 * Done by resetting the delay for this fb_info to a very
774 * long period. Pages will become writable and stay that way.
775 * Reset to normal value when all clients have closed this fb.
776 */
777 if (info->fbdefio)
778 info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE;
779
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700780 area = (struct dloarea *)arg;
781
782 if (area->x < 0)
783 area->x = 0;
784
785 if (area->x > info->var.xres)
786 area->x = info->var.xres;
787
788 if (area->y < 0)
789 area->y = 0;
790
791 if (area->y > info->var.yres)
792 area->y = info->var.yres;
793
Bernie Thompson530f43a2010-02-15 06:46:21 -0800794 dlfb_handle_damage(dev, area->x, area->y, area->w, area->h,
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700795 info->screen_base);
796 }
Roberto De Ioris7316bc52009-06-10 23:02:19 -0700797
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700798 return 0;
799}
800
Greg Kroah-Hartmanf05e0572009-06-03 14:47:08 -0700801/* taken from vesafb */
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700802static int
Bernie Thompson45742032010-02-15 06:46:04 -0800803dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green,
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700804 unsigned blue, unsigned transp, struct fb_info *info)
805{
806 int err = 0;
807
808 if (regno >= info->cmap.len)
809 return 1;
810
811 if (regno < 16) {
812 if (info->var.red.offset == 10) {
813 /* 1:5:5:5 */
814 ((u32 *) (info->pseudo_palette))[regno] =
815 ((red & 0xf800) >> 1) |
816 ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);
817 } else {
818 /* 0:5:6:5 */
819 ((u32 *) (info->pseudo_palette))[regno] =
820 ((red & 0xf800)) |
821 ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
822 }
823 }
824
825 return err;
826}
827
Bernie Thompson3e8f3d62010-02-15 06:46:26 -0800828/*
829 * It's common for several clients to have framebuffer open simultaneously.
830 * e.g. both fbcon and X. Makes things interesting.
Bernie Thompson33077b82010-09-05 16:35:19 -0700831 * Assumes caller is holding info->lock (for open and release at least)
Bernie Thompson3e8f3d62010-02-15 06:46:26 -0800832 */
833static int dlfb_ops_open(struct fb_info *info, int user)
834{
835 struct dlfb_data *dev = info->par;
836
Bernie Thompsond5ed5432010-09-05 16:35:39 -0700837 /*
838 * fbcon aggressively connects to first framebuffer it finds,
839 * preventing other clients (X) from working properly. Usually
840 * not what the user wants. Fail by default with option to enable.
841 */
842 if ((user == 0) & (!console))
843 return -EBUSY;
Bernie Thompson3e8f3d62010-02-15 06:46:26 -0800844
Bernie Thompson33077b82010-09-05 16:35:19 -0700845 /* If the USB device is gone, we don't accept new opens */
846 if (dev->virtualized)
847 return -ENODEV;
Bernie Thompson3e8f3d62010-02-15 06:46:26 -0800848
849 dev->fb_count++;
850
Bernie Thompson33077b82010-09-05 16:35:19 -0700851 kref_get(&dev->kref);
852
Bernie Thompsond5ed5432010-09-05 16:35:39 -0700853 if (fb_defio && (info->fbdefio == NULL)) {
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700854 /* enable defio at last moment if not disabled by client */
855
856 struct fb_deferred_io *fbdefio;
857
Joe Perches31a9f472010-10-31 15:33:55 -0700858 fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700859
860 if (fbdefio) {
861 fbdefio->delay = DL_DEFIO_WRITE_DELAY;
862 fbdefio->deferred_io = dlfb_dpy_deferred_io;
863 }
864
865 info->fbdefio = fbdefio;
Bernie Thompson3e8f3d62010-02-15 06:46:26 -0800866 fb_deferred_io_init(info);
867 }
Bernie Thompson3e8f3d62010-02-15 06:46:26 -0800868
Paul Mundt81f6f3c2011-01-06 18:07:54 +0900869 pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
Bernie Thompson3e8f3d62010-02-15 06:46:26 -0800870 info->node, user, info, dev->fb_count);
871
Roberto De Ioris88e58b12009-06-03 14:03:06 -0700872 return 0;
873}
874
Bernie Thompson4a4854d2010-02-15 06:45:55 -0800875/*
876 * Called when all client interfaces to start transactions have been disabled,
877 * and all references to our device instance (dlfb_data) are released.
878 * Every transaction must have a reference, so we know are fully spun down
879 */
Bernie Thompson33077b82010-09-05 16:35:19 -0700880static void dlfb_free(struct kref *kref)
Bernie Thompson4a4854d2010-02-15 06:45:55 -0800881{
882 struct dlfb_data *dev = container_of(kref, struct dlfb_data, kref);
883
Bernie Thompson33077b82010-09-05 16:35:19 -0700884 /* this function will wait for all in-flight urbs to complete */
885 if (dev->urbs.count > 0)
886 dlfb_free_urb_list(dev);
887
Bernie Thompson4a4854d2010-02-15 06:45:55 -0800888 if (dev->backing_buffer)
889 vfree(dev->backing_buffer);
890
Bernie Thompson33077b82010-09-05 16:35:19 -0700891 kfree(dev->edid);
892
Paul Mundt81f6f3c2011-01-06 18:07:54 +0900893 pr_warn("freeing dlfb_data %p\n", dev);
Bernie Thompson3e8f3d62010-02-15 06:46:26 -0800894
Bernie Thompson4a4854d2010-02-15 06:45:55 -0800895 kfree(dev);
896}
897
Bernie Thompson5bea1fb2010-09-05 18:28:29 -0700898static void dlfb_release_urb_work(struct work_struct *work)
899{
900 struct urb_node *unode = container_of(work, struct urb_node,
901 release_urb_work.work);
902
903 up(&unode->dev->urbs.limit_sem);
904}
Bernie Thompson33077b82010-09-05 16:35:19 -0700905
906static void dlfb_free_framebuffer_work(struct work_struct *work)
Bernie Thompson2469d5d2010-02-15 06:46:13 -0800907{
Bernie Thompson33077b82010-09-05 16:35:19 -0700908 struct dlfb_data *dev = container_of(work, struct dlfb_data,
909 free_framebuffer_work.work);
910 struct fb_info *info = dev->info;
911 int node = info->node;
912
913 unregister_framebuffer(info);
Bernie Thompson2469d5d2010-02-15 06:46:13 -0800914
915 if (info->cmap.len != 0)
916 fb_dealloc_cmap(&info->cmap);
917 if (info->monspecs.modedb)
918 fb_destroy_modedb(info->monspecs.modedb);
919 if (info->screen_base)
920 vfree(info->screen_base);
921
922 fb_destroy_modelist(&info->modelist);
923
Bernie Thompson33077b82010-09-05 16:35:19 -0700924 dev->info = 0;
925
926 /* Assume info structure is freed after this point */
Bernie Thompson2469d5d2010-02-15 06:46:13 -0800927 framebuffer_release(info);
928
Paul Mundt81f6f3c2011-01-06 18:07:54 +0900929 pr_warn("fb_info for /dev/fb%d has been freed\n", node);
Bernie Thompson33077b82010-09-05 16:35:19 -0700930
931 /* ref taken in probe() as part of registering framebfufer */
932 kref_put(&dev->kref, dlfb_free);
933}
934
935/*
936 * Assumes caller is holding info->lock mutex (for open and release at least)
937 */
938static int dlfb_ops_release(struct fb_info *info, int user)
939{
940 struct dlfb_data *dev = info->par;
941
942 dev->fb_count--;
943
944 /* We can't free fb_info here - fbmem will touch it when we return */
945 if (dev->virtualized && (dev->fb_count == 0))
946 schedule_delayed_work(&dev->free_framebuffer_work, HZ);
947
Bernie Thompson33077b82010-09-05 16:35:19 -0700948 if ((dev->fb_count == 0) && (info->fbdefio)) {
949 fb_deferred_io_cleanup(info);
950 kfree(info->fbdefio);
951 info->fbdefio = NULL;
952 info->fbops->fb_mmap = dlfb_ops_mmap;
953 }
Bernie Thompson33077b82010-09-05 16:35:19 -0700954
Paul Mundt81f6f3c2011-01-06 18:07:54 +0900955 pr_warn("released /dev/fb%d user=%d count=%d\n",
Bernie Thompson33077b82010-09-05 16:35:19 -0700956 info->node, user, dev->fb_count);
957
958 kref_put(&dev->kref, dlfb_free);
959
960 return 0;
Bernie Thompson2469d5d2010-02-15 06:46:13 -0800961}
962
963/*
Bernie Thompson7d9485e2010-02-15 06:46:08 -0800964 * Check whether a video mode is supported by the DisplayLink chip
965 * We start from monitor's modes, so don't need to filter that here
966 */
967static int dlfb_is_valid_mode(struct fb_videomode *mode,
968 struct fb_info *info)
969{
970 struct dlfb_data *dev = info->par;
971
Bernie Thompson18dffdf2010-09-05 16:35:23 -0700972 if (mode->xres * mode->yres > dev->sku_pixel_limit) {
Paul Mundt81f6f3c2011-01-06 18:07:54 +0900973 pr_warn("%dx%d beyond chip capabilities\n",
Bernie Thompson18dffdf2010-09-05 16:35:23 -0700974 mode->xres, mode->yres);
Bernie Thompson7d9485e2010-02-15 06:46:08 -0800975 return 0;
Bernie Thompson18dffdf2010-09-05 16:35:23 -0700976 }
977
Paul Mundt81f6f3c2011-01-06 18:07:54 +0900978 pr_info("%dx%d valid mode\n", mode->xres, mode->yres);
Bernie Thompson7d9485e2010-02-15 06:46:08 -0800979
980 return 1;
981}
982
983static void dlfb_var_color_format(struct fb_var_screeninfo *var)
984{
985 const struct fb_bitfield red = { 11, 5, 0 };
986 const struct fb_bitfield green = { 5, 6, 0 };
987 const struct fb_bitfield blue = { 0, 5, 0 };
988
989 var->bits_per_pixel = 16;
990 var->red = red;
991 var->green = green;
992 var->blue = blue;
993}
994
Bernie Thompson2469d5d2010-02-15 06:46:13 -0800995static int dlfb_ops_check_var(struct fb_var_screeninfo *var,
996 struct fb_info *info)
997{
998 struct fb_videomode mode;
999
1000 /* TODO: support dynamically changing framebuffer size */
1001 if ((var->xres * var->yres * 2) > info->fix.smem_len)
1002 return -EINVAL;
1003
1004 /* set device-specific elements of var unrelated to mode */
1005 dlfb_var_color_format(var);
1006
1007 fb_var_to_videomode(&mode, var);
1008
1009 if (!dlfb_is_valid_mode(&mode, info))
1010 return -EINVAL;
1011
1012 return 0;
1013}
1014
1015static int dlfb_ops_set_par(struct fb_info *info)
1016{
1017 struct dlfb_data *dev = info->par;
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001018 int result;
1019 u16 *pix_framebuffer;
1020 int i;
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001021
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001022 pr_notice("set_par mode %dx%d\n", info->var.xres, info->var.yres);
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001023
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001024 result = dlfb_set_video_mode(dev, &info->var);
1025
1026 if ((result == 0) && (dev->fb_count == 0)) {
1027
1028 /* paint greenscreen */
1029
1030 pix_framebuffer = (u16 *) info->screen_base;
1031 for (i = 0; i < info->fix.smem_len / 2; i++)
1032 pix_framebuffer[i] = 0x37e6;
1033
1034 dlfb_handle_damage(dev, 0, 0, info->var.xres, info->var.yres,
1035 info->screen_base);
1036 }
1037
1038 return result;
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001039}
1040
Bernie Thompson9825f702010-09-05 16:35:10 -07001041/*
1042 * In order to come back from full DPMS off, we need to set the mode again
1043 */
Bernie Thompson45742032010-02-15 06:46:04 -08001044static int dlfb_ops_blank(int blank_mode, struct fb_info *info)
Greg Kroah-Hartmanf05e0572009-06-03 14:47:08 -07001045{
Bernie Thompson530f43a2010-02-15 06:46:21 -08001046 struct dlfb_data *dev = info->par;
Roberto De Ioris7316bc52009-06-10 23:02:19 -07001047
Roberto De Ioris7316bc52009-06-10 23:02:19 -07001048 if (blank_mode != FB_BLANK_UNBLANK) {
Bernie Thompson9825f702010-09-05 16:35:10 -07001049 char *bufptr;
1050 struct urb *urb;
Roberto De Ioris7316bc52009-06-10 23:02:19 -07001051
Bernie Thompson9825f702010-09-05 16:35:10 -07001052 urb = dlfb_get_urb(dev);
1053 if (!urb)
1054 return 0;
1055
1056 bufptr = (char *) urb->transfer_buffer;
1057 bufptr = dlfb_vidreg_lock(bufptr);
1058 bufptr = dlfb_enable_hvsync(bufptr, false);
1059 bufptr = dlfb_vidreg_unlock(bufptr);
1060
1061 dlfb_submit_urb(dev, urb, bufptr -
1062 (char *) urb->transfer_buffer);
1063 } else {
1064 dlfb_set_video_mode(dev, &info->var);
1065 }
Roberto De Ioris7316bc52009-06-10 23:02:19 -07001066
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001067 return 0;
1068}
1069
1070static struct fb_ops dlfb_ops = {
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001071 .owner = THIS_MODULE,
Paul Mundt1a3e5282011-01-06 17:29:24 +09001072 .fb_read = fb_sys_read,
Bernie Thompsond46ecb92010-09-05 16:35:04 -07001073 .fb_write = dlfb_ops_write,
Bernie Thompson45742032010-02-15 06:46:04 -08001074 .fb_setcolreg = dlfb_ops_setcolreg,
1075 .fb_fillrect = dlfb_ops_fillrect,
1076 .fb_copyarea = dlfb_ops_copyarea,
1077 .fb_imageblit = dlfb_ops_imageblit,
1078 .fb_mmap = dlfb_ops_mmap,
1079 .fb_ioctl = dlfb_ops_ioctl,
Bernie Thompson3e8f3d62010-02-15 06:46:26 -08001080 .fb_open = dlfb_ops_open,
Bernie Thompson45742032010-02-15 06:46:04 -08001081 .fb_release = dlfb_ops_release,
1082 .fb_blank = dlfb_ops_blank,
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001083 .fb_check_var = dlfb_ops_check_var,
1084 .fb_set_par = dlfb_ops_set_par,
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001085};
1086
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001087
Bernie Thompsoncc403dc2010-02-15 06:45:49 -08001088/*
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001089 * Assumes &info->lock held by caller
1090 * Assumes no active clients have framebuffer open
1091 */
1092static int dlfb_realloc_framebuffer(struct dlfb_data *dev, struct fb_info *info)
1093{
1094 int retval = -ENOMEM;
1095 int old_len = info->fix.smem_len;
1096 int new_len;
1097 unsigned char *old_fb = info->screen_base;
1098 unsigned char *new_fb;
1099 unsigned char *new_back;
1100
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001101 pr_warn("Reallocating framebuffer. Addresses will change!\n");
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001102
1103 new_len = info->fix.line_length * info->var.yres;
1104
1105 if (PAGE_ALIGN(new_len) > old_len) {
1106 /*
1107 * Alloc system memory for virtual framebuffer
1108 */
1109 new_fb = vmalloc(new_len);
1110 if (!new_fb) {
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001111 pr_err("Virtual framebuffer alloc failed\n");
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001112 goto error;
1113 }
1114
1115 if (info->screen_base) {
1116 memcpy(new_fb, old_fb, old_len);
1117 vfree(info->screen_base);
1118 }
1119
1120 info->screen_base = new_fb;
1121 info->fix.smem_len = PAGE_ALIGN(new_len);
1122 info->fix.smem_start = (unsigned long) new_fb;
1123 info->flags = udlfb_info_flags;
1124
1125 /*
1126 * Second framebuffer copy to mirror the framebuffer state
1127 * on the physical USB device. We can function without this.
1128 * But with imperfect damage info we may send pixels over USB
1129 * that were, in fact, unchanged - wasting limited USB bandwidth
1130 */
Joe Perches5b84cc72010-11-04 20:07:59 -07001131 new_back = vzalloc(new_len);
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001132 if (!new_back)
Linus Torvalds949f6712011-01-10 16:04:53 -08001133 pr_info("No shadow/backing buffer allocated\n");
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001134 else {
1135 if (dev->backing_buffer)
1136 vfree(dev->backing_buffer);
1137 dev->backing_buffer = new_back;
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001138 }
1139 }
1140
1141 retval = 0;
1142
1143error:
1144 return retval;
1145}
1146
1147/*
1148 * 1) Get EDID from hw, or use sw default
1149 * 2) Parse into various fb_info structs
1150 * 3) Allocate virtual framebuffer memory to back highest res mode
1151 *
1152 * Parses EDID into three places used by various parts of fbdev:
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001153 * fb_var_screeninfo contains the timing of the monitor's preferred mode
1154 * fb_info.monspecs is full parsed EDID info, including monspecs.modedb
1155 * fb_info.modelist is a linked list of all monitor & VESA modes which work
1156 *
1157 * If EDID is not readable/valid, then modelist is all VESA modes,
1158 * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001159 * Returns 0 if successful
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001160 */
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001161static int dlfb_setup_modes(struct dlfb_data *dev,
1162 struct fb_info *info,
1163 char *default_edid, size_t default_edid_size)
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001164{
1165 int i;
1166 const struct fb_videomode *default_vmode = NULL;
1167 int result = 0;
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001168 char *edid;
1169 int tries = 3;
1170
1171 if (info->dev) /* only use mutex if info has been registered */
1172 mutex_lock(&info->lock);
1173
Paul Mundtb9f03a32011-01-06 18:04:02 +09001174 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001175 if (!edid) {
1176 result = -ENOMEM;
1177 goto error;
1178 }
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001179
1180 fb_destroy_modelist(&info->modelist);
1181 memset(&info->monspecs, 0, sizeof(info->monspecs));
1182
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001183 /*
1184 * Try to (re)read EDID from hardware first
1185 * EDID data may return, but not parse as valid
1186 * Try again a few times, in case of e.g. analog cable noise
1187 */
1188 while (tries--) {
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001189
Paul Mundtb9f03a32011-01-06 18:04:02 +09001190 i = dlfb_get_edid(dev, edid, EDID_LENGTH);
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001191
Paul Mundtb9f03a32011-01-06 18:04:02 +09001192 if (i >= EDID_LENGTH)
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001193 fb_edid_to_monspecs(edid, &info->monspecs);
1194
1195 if (info->monspecs.modedb_len > 0) {
1196 dev->edid = edid;
1197 dev->edid_size = i;
1198 break;
1199 }
1200 }
1201
1202 /* If that fails, use a previously returned EDID if available */
1203 if (info->monspecs.modedb_len == 0) {
1204
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001205 pr_err("Unable to get valid EDID from device/display\n");
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001206
1207 if (dev->edid) {
1208 fb_edid_to_monspecs(dev->edid, &info->monspecs);
1209 if (info->monspecs.modedb_len > 0)
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001210 pr_err("Using previously queried EDID\n");
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001211 }
1212 }
1213
1214 /* If that fails, use the default EDID we were handed */
1215 if (info->monspecs.modedb_len == 0) {
Paul Mundtb9f03a32011-01-06 18:04:02 +09001216 if (default_edid_size >= EDID_LENGTH) {
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001217 fb_edid_to_monspecs(default_edid, &info->monspecs);
1218 if (info->monspecs.modedb_len > 0) {
1219 memcpy(edid, default_edid, default_edid_size);
1220 dev->edid = edid;
1221 dev->edid_size = default_edid_size;
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001222 pr_err("Using default/backup EDID\n");
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001223 }
1224 }
1225 }
1226
1227 /* If we've got modes, let's pick a best default mode */
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001228 if (info->monspecs.modedb_len > 0) {
1229
1230 for (i = 0; i < info->monspecs.modedb_len; i++) {
1231 if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info))
1232 fb_add_videomode(&info->monspecs.modedb[i],
1233 &info->modelist);
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001234 else /* if we've removed top/best mode */
1235 info->monspecs.misc &= ~FB_MISC_1ST_DETAIL;
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001236 }
1237
1238 default_vmode = fb_find_best_display(&info->monspecs,
1239 &info->modelist);
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001240 }
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001241
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001242 /* If everything else has failed, fall back to safe default mode */
1243 if (default_vmode == NULL) {
1244
1245 struct fb_videomode fb_vmode = {0};
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001246
1247 /*
1248 * Add the standard VESA modes to our modelist
1249 * Since we don't have EDID, there may be modes that
1250 * overspec monitor and/or are incorrect aspect ratio, etc.
1251 * But at least the user has a chance to choose
1252 */
1253 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
1254 if (dlfb_is_valid_mode((struct fb_videomode *)
1255 &vesa_modes[i], info))
1256 fb_add_videomode(&vesa_modes[i],
1257 &info->modelist);
1258 }
1259
1260 /*
1261 * default to resolution safe for projectors
1262 * (since they are most common case without EDID)
1263 */
1264 fb_vmode.xres = 800;
1265 fb_vmode.yres = 600;
1266 fb_vmode.refresh = 60;
1267 default_vmode = fb_find_nearest_mode(&fb_vmode,
1268 &info->modelist);
1269 }
1270
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001271 /* If we have good mode and no active clients*/
1272 if ((default_vmode != NULL) && (dev->fb_count == 0)) {
1273
1274 fb_videomode_to_var(&info->var, default_vmode);
1275 dlfb_var_color_format(&info->var);
1276
1277 /*
1278 * with mode size info, we can now alloc our framebuffer.
1279 */
1280 memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix));
1281 info->fix.line_length = info->var.xres *
1282 (info->var.bits_per_pixel / 8);
1283
1284 result = dlfb_realloc_framebuffer(dev, info);
1285
1286 } else
1287 result = -EINVAL;
1288
1289error:
1290 if (edid && (dev->edid != edid))
1291 kfree(edid);
1292
1293 if (info->dev)
1294 mutex_unlock(&info->lock);
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001295
1296 return result;
1297}
1298
1299static ssize_t metrics_bytes_rendered_show(struct device *fbdev,
1300 struct device_attribute *a, char *buf) {
1301 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1302 struct dlfb_data *dev = fb_info->par;
1303 return snprintf(buf, PAGE_SIZE, "%u\n",
1304 atomic_read(&dev->bytes_rendered));
1305}
1306
1307static ssize_t metrics_bytes_identical_show(struct device *fbdev,
1308 struct device_attribute *a, char *buf) {
1309 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1310 struct dlfb_data *dev = fb_info->par;
1311 return snprintf(buf, PAGE_SIZE, "%u\n",
1312 atomic_read(&dev->bytes_identical));
1313}
1314
1315static ssize_t metrics_bytes_sent_show(struct device *fbdev,
1316 struct device_attribute *a, char *buf) {
1317 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1318 struct dlfb_data *dev = fb_info->par;
1319 return snprintf(buf, PAGE_SIZE, "%u\n",
1320 atomic_read(&dev->bytes_sent));
1321}
1322
1323static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev,
1324 struct device_attribute *a, char *buf) {
1325 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1326 struct dlfb_data *dev = fb_info->par;
1327 return snprintf(buf, PAGE_SIZE, "%u\n",
1328 atomic_read(&dev->cpu_kcycles_used));
1329}
1330
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001331static ssize_t edid_show(
1332 struct file *filp,
1333 struct kobject *kobj, struct bin_attribute *a,
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001334 char *buf, loff_t off, size_t count) {
1335 struct device *fbdev = container_of(kobj, struct device, kobj);
1336 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1337 struct dlfb_data *dev = fb_info->par;
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001338
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001339 if (dev->edid == NULL)
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001340 return 0;
1341
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001342 if ((off >= dev->edid_size) || (count > dev->edid_size))
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001343 return 0;
1344
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001345 if (off + count > dev->edid_size)
1346 count = dev->edid_size - off;
1347
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001348 pr_info("sysfs edid copy %p to %p, %d bytes\n",
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001349 dev->edid, buf, (int) count);
1350
1351 memcpy(buf, dev->edid, count);
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001352
1353 return count;
1354}
1355
Bernie Thompson8ef8cc42010-09-05 16:35:31 -07001356static ssize_t edid_store(
1357 struct file *filp,
1358 struct kobject *kobj, struct bin_attribute *a,
1359 char *src, loff_t src_off, size_t src_size) {
1360 struct device *fbdev = container_of(kobj, struct device, kobj);
1361 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1362 struct dlfb_data *dev = fb_info->par;
1363
1364 /* We only support write of entire EDID at once, no offset*/
Paul Mundtb9f03a32011-01-06 18:04:02 +09001365 if ((src_size != EDID_LENGTH) || (src_off != 0))
Bernie Thompson8ef8cc42010-09-05 16:35:31 -07001366 return 0;
1367
1368 dlfb_setup_modes(dev, fb_info, src, src_size);
1369
1370 if (dev->edid && (memcmp(src, dev->edid, src_size) == 0)) {
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001371 pr_info("sysfs written EDID is new default\n");
Bernie Thompson8ef8cc42010-09-05 16:35:31 -07001372 dlfb_ops_set_par(fb_info);
1373 return src_size;
1374 } else
1375 return 0;
1376}
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001377
1378static ssize_t metrics_reset_store(struct device *fbdev,
1379 struct device_attribute *attr,
1380 const char *buf, size_t count)
1381{
1382 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1383 struct dlfb_data *dev = fb_info->par;
1384
1385 atomic_set(&dev->bytes_rendered, 0);
1386 atomic_set(&dev->bytes_identical, 0);
1387 atomic_set(&dev->bytes_sent, 0);
1388 atomic_set(&dev->cpu_kcycles_used, 0);
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001389
1390 return count;
1391}
1392
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001393static struct bin_attribute edid_attr = {
1394 .attr.name = "edid",
Bernie Thompson8ef8cc42010-09-05 16:35:31 -07001395 .attr.mode = 0666,
Paul Mundtb9f03a32011-01-06 18:04:02 +09001396 .size = EDID_LENGTH,
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001397 .read = edid_show,
Bernie Thompson8ef8cc42010-09-05 16:35:31 -07001398 .write = edid_store
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001399};
1400
1401static struct device_attribute fb_device_attrs[] = {
1402 __ATTR_RO(metrics_bytes_rendered),
1403 __ATTR_RO(metrics_bytes_identical),
1404 __ATTR_RO(metrics_bytes_sent),
1405 __ATTR_RO(metrics_cpu_kcycles_used),
Greg Kroah-Hartman926c1112010-11-18 11:21:04 -08001406 __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store),
Bernie Thompson7d9485e2010-02-15 06:46:08 -08001407};
1408
1409/*
Bernie Thompsoncc403dc2010-02-15 06:45:49 -08001410 * This is necessary before we can communicate with the display controller.
1411 */
1412static int dlfb_select_std_channel(struct dlfb_data *dev)
1413{
1414 int ret;
1415 u8 set_def_chn[] = { 0x57, 0xCD, 0xDC, 0xA7,
1416 0x1C, 0x88, 0x5E, 0x15,
1417 0x60, 0xFE, 0xC6, 0x97,
1418 0x16, 0x3D, 0x47, 0xF2 };
1419
1420 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1421 NR_USB_REQUEST_CHANNEL,
1422 (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
1423 set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT);
1424 return ret;
1425}
1426
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001427static int dlfb_parse_vendor_descriptor(struct dlfb_data *dev,
1428 struct usb_device *usbdev)
1429{
1430 char *desc;
1431 char *buf;
1432 char *desc_end;
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001433
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001434 u8 total_len = 0;
1435
1436 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
1437 if (!buf)
1438 return false;
1439 desc = buf;
1440
1441 total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
1442 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
1443 if (total_len > 5) {
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001444 pr_info("vendor descriptor length:%x data:%02x %02x %02x %02x" \
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001445 "%02x %02x %02x %02x %02x %02x %02x\n",
1446 total_len, desc[0],
1447 desc[1], desc[2], desc[3], desc[4], desc[5], desc[6],
1448 desc[7], desc[8], desc[9], desc[10]);
1449
1450 if ((desc[0] != total_len) || /* descriptor length */
1451 (desc[1] != 0x5f) || /* vendor descriptor type */
1452 (desc[2] != 0x01) || /* version (2 bytes) */
1453 (desc[3] != 0x00) ||
1454 (desc[4] != total_len - 2)) /* length after type */
1455 goto unrecognized;
1456
1457 desc_end = desc + total_len;
1458 desc += 5; /* the fixed header we've already parsed */
1459
1460 while (desc < desc_end) {
1461 u8 length;
1462 u16 key;
1463
1464 key = *((u16 *) desc);
1465 desc += sizeof(u16);
1466 length = *desc;
1467 desc++;
1468
1469 switch (key) {
1470 case 0x0200: { /* max_area */
1471 u32 max_area;
1472 max_area = le32_to_cpu(*((u32 *)desc));
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001473 pr_warn("DL chip limited to %d pixel modes\n",
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001474 max_area);
1475 dev->sku_pixel_limit = max_area;
1476 break;
1477 }
1478 default:
1479 break;
1480 }
1481 desc += length;
1482 }
1483 }
1484
1485 goto success;
1486
1487unrecognized:
1488 /* allow udlfb to load for now even if firmware unrecognized */
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001489 pr_err("Unrecognized vendor firmware descriptor\n");
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001490
1491success:
1492 kfree(buf);
1493 return true;
1494}
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001495static int dlfb_usb_probe(struct usb_interface *interface,
Bernie Thompson59277b62009-11-24 15:52:21 -08001496 const struct usb_device_id *id)
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001497{
Bernie Thompson59277b62009-11-24 15:52:21 -08001498 struct usb_device *usbdev;
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001499 struct dlfb_data *dev = 0;
Bernie Thompson33077b82010-09-05 16:35:19 -07001500 struct fb_info *info = 0;
Bernie Thompson59277b62009-11-24 15:52:21 -08001501 int retval = -ENOMEM;
Bernie Thompson2685cff2010-09-05 18:29:56 -07001502 int i;
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001503
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001504 /* usb initialization */
1505
1506 usbdev = interface_to_usbdev(interface);
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001507
Bernie Thompson59277b62009-11-24 15:52:21 -08001508 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1509 if (dev == NULL) {
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001510 err("dlfb_usb_probe: failed alloc of dev struct\n");
1511 goto error;
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001512 }
1513
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001514 /* we need to wait for both usb and fbdev to spin down on disconnect */
1515 kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001516 kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001517
Bernie Thompson59277b62009-11-24 15:52:21 -08001518 dev->udev = usbdev;
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001519 dev->gdev = &usbdev->dev; /* our generic struct device * */
Bernie Thompson59277b62009-11-24 15:52:21 -08001520 usb_set_intfdata(interface, dev);
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001521
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001522 pr_info("%s %s - serial #%s\n",
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001523 usbdev->manufacturer, usbdev->product, usbdev->serial);
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001524 pr_info("vid_%04x&pid_%04x&rev_%04x driver's dlfb_data struct at %p\n",
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001525 usbdev->descriptor.idVendor, usbdev->descriptor.idProduct,
1526 usbdev->descriptor.bcdDevice, dev);
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001527 pr_info("console enable=%d\n", console);
1528 pr_info("fb_defio enable=%d\n", fb_defio);
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001529
1530 dev->sku_pixel_limit = 2048 * 1152; /* default to maximum */
1531
1532 if (!dlfb_parse_vendor_descriptor(dev, usbdev)) {
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001533 pr_err("firmware not recognized. Assume incompatible device\n");
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001534 goto error;
1535 }
1536
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001537 if (!dlfb_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
1538 retval = -ENOMEM;
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001539 pr_err("dlfb_alloc_urb_list failed\n");
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001540 goto error;
1541 }
1542
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001543 /* We don't register a new USB class. Our client interface is fbdev */
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001544
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001545 /* allocates framebuffer driver structure, not framebuffer memory */
1546 info = framebuffer_alloc(0, &usbdev->dev);
1547 if (!info) {
1548 retval = -ENOMEM;
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001549 pr_err("framebuffer_alloc failed\n");
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001550 goto error;
1551 }
Bernie Thompson33077b82010-09-05 16:35:19 -07001552
Bernie Thompson59277b62009-11-24 15:52:21 -08001553 dev->info = info;
1554 info->par = dev;
1555 info->pseudo_palette = dev->pseudo_palette;
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001556 info->fbops = &dlfb_ops;
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001557
Bernie Thompson59277b62009-11-24 15:52:21 -08001558 retval = fb_alloc_cmap(&info->cmap, 256, 0);
1559 if (retval < 0) {
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001560 pr_err("fb_alloc_cmap failed %x\n", retval);
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001561 goto error;
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001562 }
1563
Bernie Thompson33077b82010-09-05 16:35:19 -07001564 INIT_DELAYED_WORK(&dev->free_framebuffer_work,
1565 dlfb_free_framebuffer_work);
1566
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001567 INIT_LIST_HEAD(&info->modelist);
1568
1569 retval = dlfb_setup_modes(dev, info, NULL, 0);
1570 if (retval != 0) {
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001571 pr_err("unable to find common mode for display and adapter\n");
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001572 goto error;
1573 }
1574
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001575 /* ready to begin using device */
1576
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001577 atomic_set(&dev->usb_active, 1);
Bernie Thompson59277b62009-11-24 15:52:21 -08001578 dlfb_select_std_channel(dev);
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001579
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001580 dlfb_ops_check_var(&info->var, info);
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001581 dlfb_ops_set_par(info);
1582
Bernie Thompson59277b62009-11-24 15:52:21 -08001583 retval = register_framebuffer(info);
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001584 if (retval < 0) {
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001585 pr_err("register_framebuffer failed %d\n", retval);
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001586 goto error;
1587 }
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001588
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001589 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++)
1590 device_create_file(info->dev, &fb_device_attrs[i]);
Greg Kroah-Hartmanf05e0572009-06-03 14:47:08 -07001591
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001592 device_create_bin_file(info->dev, &edid_attr);
1593
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001594 pr_info("DisplayLink USB device /dev/fb%d attached. %dx%d resolution."
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001595 " Using %dK framebuffer memory\n", info->node,
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001596 info->var.xres, info->var.yres,
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001597 ((dev->backing_buffer) ?
Bernie Thompson18dffdf2010-09-05 16:35:23 -07001598 info->fix.smem_len * 2 : info->fix.smem_len) >> 10);
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001599 return 0;
1600
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001601error:
1602 if (dev) {
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001603
Bernie Thompson33077b82010-09-05 16:35:19 -07001604 if (info) {
1605 if (info->cmap.len != 0)
1606 fb_dealloc_cmap(&info->cmap);
1607 if (info->monspecs.modedb)
1608 fb_destroy_modedb(info->monspecs.modedb);
1609 if (info->screen_base)
1610 vfree(info->screen_base);
1611
1612 fb_destroy_modelist(&info->modelist);
1613
1614 framebuffer_release(info);
1615 }
1616
1617 if (dev->backing_buffer)
1618 vfree(dev->backing_buffer);
1619
1620 kref_put(&dev->kref, dlfb_free); /* ref for framebuffer */
1621 kref_put(&dev->kref, dlfb_free); /* last ref from kref_init */
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001622
1623 /* dev has been deallocated. Do not dereference */
1624 }
1625
Bernie Thompson59277b62009-11-24 15:52:21 -08001626 return retval;
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001627}
1628
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001629static void dlfb_usb_disconnect(struct usb_interface *interface)
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001630{
Bernie Thompson59277b62009-11-24 15:52:21 -08001631 struct dlfb_data *dev;
1632 struct fb_info *info;
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001633 int i;
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001634
Bernie Thompson59277b62009-11-24 15:52:21 -08001635 dev = usb_get_intfdata(interface);
Bernie Thompson59277b62009-11-24 15:52:21 -08001636 info = dev->info;
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001637
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001638 pr_info("USB disconnect starting\n");
Bernie Thompson33077b82010-09-05 16:35:19 -07001639
1640 /* we virtualize until all fb clients release. Then we free */
1641 dev->virtualized = true;
1642
1643 /* When non-active we'll update virtual framebuffer, but no new urbs */
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001644 atomic_set(&dev->usb_active, 0);
1645
Bernie Thompson33077b82010-09-05 16:35:19 -07001646 /* remove udlfb's sysfs interfaces */
1647 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++)
1648 device_remove_file(info->dev, &fb_device_attrs[i]);
1649 device_remove_bin_file(info->dev, &edid_attr);
1650
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001651 usb_set_intfdata(interface, NULL);
1652
Bernie Thompson33077b82010-09-05 16:35:19 -07001653 /* if clients still have us open, will be freed on last close */
1654 if (dev->fb_count == 0)
1655 schedule_delayed_work(&dev->free_framebuffer_work, 0);
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001656
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001657 /* release reference taken by kref_init in probe() */
Bernie Thompson33077b82010-09-05 16:35:19 -07001658 kref_put(&dev->kref, dlfb_free);
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001659
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001660 /* consider dlfb_data freed */
1661
1662 return;
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001663}
1664
1665static struct usb_driver dlfb_driver = {
1666 .name = "udlfb",
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001667 .probe = dlfb_usb_probe,
1668 .disconnect = dlfb_usb_disconnect,
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001669 .id_table = id_table,
1670};
1671
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001672static int __init dlfb_module_init(void)
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001673{
1674 int res;
1675
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001676 res = usb_register(&dlfb_driver);
1677 if (res)
1678 err("usb_register failed. Error number %d", res);
1679
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001680 return res;
1681}
1682
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001683static void __exit dlfb_module_exit(void)
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001684{
1685 usb_deregister(&dlfb_driver);
1686}
1687
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001688module_init(dlfb_module_init);
1689module_exit(dlfb_module_exit);
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001690
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001691static void dlfb_urb_completion(struct urb *urb)
1692{
1693 struct urb_node *unode = urb->context;
1694 struct dlfb_data *dev = unode->dev;
1695 unsigned long flags;
1696
1697 /* sync/async unlink faults aren't errors */
1698 if (urb->status) {
1699 if (!(urb->status == -ENOENT ||
1700 urb->status == -ECONNRESET ||
1701 urb->status == -ESHUTDOWN)) {
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001702 pr_err("%s - nonzero write bulk status received: %d\n",
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001703 __func__, urb->status);
1704 atomic_set(&dev->lost_pixels, 1);
1705 }
1706 }
1707
1708 urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */
1709
1710 spin_lock_irqsave(&dev->urbs.lock, flags);
1711 list_add_tail(&unode->entry, &dev->urbs.list);
1712 dev->urbs.available++;
1713 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1714
Bernie Thompson5bea1fb2010-09-05 18:28:29 -07001715 /*
1716 * When using fb_defio, we deadlock if up() is called
1717 * while another is waiting. So queue to another process.
1718 */
1719 if (fb_defio)
1720 schedule_delayed_work(&unode->release_urb_work, 0);
1721 else
1722 up(&dev->urbs.limit_sem);
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001723}
1724
1725static void dlfb_free_urb_list(struct dlfb_data *dev)
1726{
1727 int count = dev->urbs.count;
1728 struct list_head *node;
1729 struct urb_node *unode;
1730 struct urb *urb;
1731 int ret;
1732 unsigned long flags;
1733
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001734 pr_notice("Waiting for completes and freeing all render urbs\n");
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001735
1736 /* keep waiting and freeing, until we've got 'em all */
1737 while (count--) {
Bernie Thompson33077b82010-09-05 16:35:19 -07001738
1739 /* Getting interrupted means a leak, but ok at shutdown*/
1740 ret = down_interruptible(&dev->urbs.limit_sem);
1741 if (ret)
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001742 break;
Bernie Thompson33077b82010-09-05 16:35:19 -07001743
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001744 spin_lock_irqsave(&dev->urbs.lock, flags);
1745
1746 node = dev->urbs.list.next; /* have reserved one with sem */
1747 list_del_init(node);
1748
1749 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1750
1751 unode = list_entry(node, struct urb_node, entry);
1752 urb = unode->urb;
1753
1754 /* Free each separately allocated piece */
Greg Kroah-Hartmanc220cc32010-04-29 15:36:29 -07001755 usb_free_coherent(urb->dev, dev->urbs.size,
1756 urb->transfer_buffer, urb->transfer_dma);
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001757 usb_free_urb(urb);
1758 kfree(node);
1759 }
1760
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001761}
1762
1763static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size)
1764{
1765 int i = 0;
1766 struct urb *urb;
1767 struct urb_node *unode;
1768 char *buf;
1769
1770 spin_lock_init(&dev->urbs.lock);
1771
1772 dev->urbs.size = size;
1773 INIT_LIST_HEAD(&dev->urbs.list);
1774
1775 while (i < count) {
1776 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
1777 if (!unode)
1778 break;
1779 unode->dev = dev;
1780
Bernie Thompson5bea1fb2010-09-05 18:28:29 -07001781 INIT_DELAYED_WORK(&unode->release_urb_work,
1782 dlfb_release_urb_work);
1783
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001784 urb = usb_alloc_urb(0, GFP_KERNEL);
1785 if (!urb) {
1786 kfree(unode);
1787 break;
1788 }
1789 unode->urb = urb;
1790
Greg Kroah-Hartmanc220cc32010-04-29 15:36:29 -07001791 buf = usb_alloc_coherent(dev->udev, MAX_TRANSFER, GFP_KERNEL,
1792 &urb->transfer_dma);
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001793 if (!buf) {
1794 kfree(unode);
1795 usb_free_urb(urb);
1796 break;
1797 }
1798
1799 /* urb->transfer_buffer_length set to actual before submit */
1800 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1),
1801 buf, size, dlfb_urb_completion, unode);
1802 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1803
1804 list_add_tail(&unode->entry, &dev->urbs.list);
1805
1806 i++;
1807 }
1808
1809 sema_init(&dev->urbs.limit_sem, i);
1810 dev->urbs.count = i;
1811 dev->urbs.available = i;
1812
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001813 pr_notice("allocated %d %d byte urbs\n", i, (int) size);
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001814
1815 return i;
1816}
1817
1818static struct urb *dlfb_get_urb(struct dlfb_data *dev)
1819{
1820 int ret = 0;
1821 struct list_head *entry;
1822 struct urb_node *unode;
1823 struct urb *urb = NULL;
1824 unsigned long flags;
1825
1826 /* Wait for an in-flight buffer to complete and get re-queued */
1827 ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT);
1828 if (ret) {
1829 atomic_set(&dev->lost_pixels, 1);
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001830 pr_warn("wait for urb interrupted: %x available: %d\n",
Bernie Thompson5bea1fb2010-09-05 18:28:29 -07001831 ret, dev->urbs.available);
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001832 goto error;
1833 }
1834
1835 spin_lock_irqsave(&dev->urbs.lock, flags);
1836
1837 BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */
1838 entry = dev->urbs.list.next;
1839 list_del_init(entry);
1840 dev->urbs.available--;
1841
1842 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1843
1844 unode = list_entry(entry, struct urb_node, entry);
1845 urb = unode->urb;
1846
1847error:
1848 return urb;
1849}
1850
1851static int dlfb_submit_urb(struct dlfb_data *dev, struct urb *urb, size_t len)
1852{
1853 int ret;
1854
1855 BUG_ON(len > dev->urbs.size);
1856
1857 urb->transfer_buffer_length = len; /* set to actual payload len */
1858 ret = usb_submit_urb(urb, GFP_KERNEL);
1859 if (ret) {
1860 dlfb_urb_completion(urb); /* because no one else will */
1861 atomic_set(&dev->lost_pixels, 1);
Paul Mundt81f6f3c2011-01-06 18:07:54 +09001862 pr_err("usb_submit_urb error %x\n", ret);
Bernie Thompson4a4854d2010-02-15 06:45:55 -08001863 }
1864 return ret;
1865}
1866
Bernie Thompsond5ed5432010-09-05 16:35:39 -07001867module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1868MODULE_PARM_DESC(console, "Allow fbcon to consume first framebuffer found");
1869
1870module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1871MODULE_PARM_DESC(fb_defio, "Enable fb_defio mmap support. *Experimental*");
1872
Bernie Thompson59277b62009-11-24 15:52:21 -08001873MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, "
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001874 "Jaya Kumar <jayakumar.lkml@gmail.com>, "
1875 "Bernie Thompson <bernie@plugable.com>");
1876MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver");
Roberto De Ioris88e58b12009-06-03 14:03:06 -07001877MODULE_LICENSE("GPL");
Bernie Thompson2469d5d2010-02-15 06:46:13 -08001878