a6c2ba28 |
1 | /* |
2 | em2820-core.c - driver for Empia EM2820/2840 USB video capture devices |
3 | |
4 | Copyright (C) 2005 Markus Rechberger <mrechberger@gmail.com> |
5 | Ludovico Cavedon <cavedon@sssup.it> |
6 | Mauro Carvalho Chehab <mchehab@brturbo.com.br> |
7 | |
8 | Based on the em2800 driver from Sascha Sommer <saschasommer@freenet.de> |
9 | |
10 | This program is free software; you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by |
12 | the Free Software Foundation; either version 2 of the License, or |
13 | (at your option) any later version. |
14 | |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | GNU General Public License for more details. |
19 | |
20 | You should have received a copy of the GNU General Public License |
21 | along with this program; if not, write to the Free Software |
22 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
23 | */ |
24 | |
25 | #include <linux/init.h> |
26 | #include <linux/list.h> |
27 | #include <linux/module.h> |
28 | #include <linux/moduleparam.h> |
a6c2ba28 |
29 | #include <linux/usb.h> |
30 | #include <linux/vmalloc.h> |
31 | |
32 | #include "em2820.h" |
33 | |
34 | /* #define ENABLE_DEBUG_ISOC_FRAMES */ |
35 | |
36 | unsigned int core_debug = 0; |
37 | module_param(core_debug,int,0644); |
38 | MODULE_PARM_DESC(core_debug,"enable debug messages [core]"); |
39 | |
40 | #define em2820_coredbg(fmt, arg...) do {\ |
41 | if (core_debug) \ |
42 | printk(KERN_INFO "%s %s :"fmt, \ |
43 | dev->name, __FUNCTION__ , ##arg); } while (0) |
44 | |
45 | unsigned int reg_debug = 0; |
46 | module_param(reg_debug,int,0644); |
47 | MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]"); |
48 | |
49 | #define em2820_regdbg(fmt, arg...) do {\ |
50 | if (reg_debug) \ |
51 | printk(KERN_INFO "%s %s :"fmt, \ |
52 | dev->name, __FUNCTION__ , ##arg); } while (0) |
53 | |
54 | unsigned int isoc_debug = 0; |
55 | module_param(isoc_debug,int,0644); |
56 | MODULE_PARM_DESC(core_debug,"enable debug messages [isoc transfers]"); |
57 | |
58 | #define em2820_isocdbg(fmt, arg...) do {\ |
59 | if (isoc_debug) \ |
60 | printk(KERN_INFO "%s %s :"fmt, \ |
61 | dev->name, __FUNCTION__ , ##arg); } while (0) |
62 | |
63 | static int alt = EM2820_PINOUT; |
64 | module_param(alt, int, 0644); |
65 | MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint"); |
66 | |
67 | /* ------------------------------------------------------------------ */ |
68 | /* debug help functions */ |
69 | |
70 | static const char *v4l1_ioctls[] = { |
71 | "0", "CGAP", "GCHAN", "SCHAN", "GTUNER", "STUNER", "GPICT", "SPICT", |
72 | "CCAPTURE", "GWIN", "SWIN", "GFBUF", "SFBUF", "KEY", "GFREQ", |
73 | "SFREQ", "GAUDIO", "SAUDIO", "SYNC", "MCAPTURE", "GMBUF", "GUNIT", |
74 | "GCAPTURE", "SCAPTURE", "SPLAYMODE", "SWRITEMODE", "GPLAYINFO", |
75 | "SMICROCODE", "GVBIFMT", "SVBIFMT" }; |
76 | #define V4L1_IOCTLS ARRAY_SIZE(v4l1_ioctls) |
77 | |
78 | static const char *v4l2_ioctls[] = { |
79 | "QUERYCAP", "1", "ENUM_PIXFMT", "ENUM_FBUFFMT", "G_FMT", "S_FMT", |
80 | "G_COMP", "S_COMP", "REQBUFS", "QUERYBUF", "G_FBUF", "S_FBUF", |
81 | "G_WIN", "S_WIN", "PREVIEW", "QBUF", "16", "DQBUF", "STREAMON", |
82 | "STREAMOFF", "G_PERF", "G_PARM", "S_PARM", "G_STD", "S_STD", |
83 | "ENUMSTD", "ENUMINPUT", "G_CTRL", "S_CTRL", "G_TUNER", "S_TUNER", |
84 | "G_FREQ", "S_FREQ", "G_AUDIO", "S_AUDIO", "35", "QUERYCTRL", |
85 | "QUERYMENU", "G_INPUT", "S_INPUT", "ENUMCVT", "41", "42", "43", |
86 | "44", "45", "G_OUTPUT", "S_OUTPUT", "ENUMOUTPUT", "G_AUDOUT", |
87 | "S_AUDOUT", "ENUMFX", "G_EFFECT", "S_EFFECT", "G_MODULATOR", |
88 | "S_MODULATOR" |
89 | }; |
90 | #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls) |
91 | |
92 | void em2820_print_ioctl(char *name, unsigned int cmd) |
93 | { |
94 | char *dir; |
95 | |
96 | switch (_IOC_DIR(cmd)) { |
97 | case _IOC_NONE: dir = "--"; break; |
98 | case _IOC_READ: dir = "r-"; break; |
99 | case _IOC_WRITE: dir = "-w"; break; |
100 | case _IOC_READ | _IOC_WRITE: dir = "rw"; break; |
101 | default: dir = "??"; break; |
102 | } |
103 | switch (_IOC_TYPE(cmd)) { |
104 | case 'v': |
105 | printk(KERN_DEBUG "%s: ioctl 0x%08x (v4l1, %s, VIDIOC%s)\n", |
106 | name, cmd, dir, (_IOC_NR(cmd) < V4L1_IOCTLS) ? |
107 | v4l1_ioctls[_IOC_NR(cmd)] : "???"); |
108 | break; |
109 | case 'V': |
110 | printk(KERN_DEBUG "%s: ioctl 0x%08x (v4l2, %s, VIDIOC_%s)\n", |
111 | name, cmd, dir, (_IOC_NR(cmd) < V4L2_IOCTLS) ? |
112 | v4l2_ioctls[_IOC_NR(cmd)] : "???"); |
113 | break; |
114 | default: |
115 | printk(KERN_DEBUG "%s: ioctl 0x%08x (???, %s, #%d)\n", |
116 | name, cmd, dir, _IOC_NR(cmd)); |
117 | } |
118 | } |
119 | |
120 | static void *rvmalloc(size_t size) |
121 | { |
122 | void *mem; |
123 | unsigned long adr; |
124 | |
125 | size = PAGE_ALIGN(size); |
126 | |
127 | mem = vmalloc_32((unsigned long)size); |
128 | if (!mem) |
129 | return NULL; |
130 | |
131 | memset(mem, 0, size); |
132 | |
133 | adr = (unsigned long)mem; |
134 | while (size > 0) { |
135 | SetPageReserved(vmalloc_to_page((void *)adr)); |
136 | adr += PAGE_SIZE; |
137 | size -= PAGE_SIZE; |
138 | } |
139 | |
140 | return mem; |
141 | } |
142 | |
143 | static void rvfree(void *mem, size_t size) |
144 | { |
145 | unsigned long adr; |
146 | |
147 | if (!mem) |
148 | return; |
149 | |
150 | size = PAGE_ALIGN(size); |
151 | |
152 | adr = (unsigned long)mem; |
153 | while (size > 0) { |
154 | ClearPageReserved(vmalloc_to_page((void *)adr)); |
155 | adr += PAGE_SIZE; |
156 | size -= PAGE_SIZE; |
157 | } |
158 | |
159 | vfree(mem); |
160 | } |
161 | |
162 | /* |
163 | * em2820_request_buffers() |
164 | * allocate a number of buffers |
165 | */ |
166 | u32 em2820_request_buffers(struct em2820 *dev, u32 count) |
167 | { |
168 | const size_t imagesize = PAGE_ALIGN(dev->frame_size); /*needs to be page aligned cause the buffers can be mapped individually! */ |
169 | void *buff = NULL; |
170 | u32 i; |
171 | em2820_coredbg("requested %i buffers with size %i", count, imagesize); |
172 | if (count > EM2820_NUM_FRAMES) |
173 | count = EM2820_NUM_FRAMES; |
174 | |
175 | dev->num_frames = count; |
176 | while (dev->num_frames > 0) { |
177 | if ((buff = rvmalloc(dev->num_frames * imagesize))) |
178 | break; |
179 | dev->num_frames--; |
180 | } |
181 | |
182 | for (i = 0; i < dev->num_frames; i++) { |
183 | dev->frame[i].bufmem = buff + i * imagesize; |
184 | dev->frame[i].buf.index = i; |
185 | dev->frame[i].buf.m.offset = i * imagesize; |
186 | dev->frame[i].buf.length = dev->frame_size; |
187 | dev->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
188 | dev->frame[i].buf.sequence = 0; |
189 | dev->frame[i].buf.field = V4L2_FIELD_NONE; |
190 | dev->frame[i].buf.memory = V4L2_MEMORY_MMAP; |
191 | dev->frame[i].buf.flags = 0; |
192 | } |
193 | return dev->num_frames; |
194 | } |
195 | |
196 | /* |
197 | * em2820_queue_unusedframes() |
198 | * add all frames that are not currently in use to the inbuffer queue |
199 | */ |
200 | void em2820_queue_unusedframes(struct em2820 *dev) |
201 | { |
202 | unsigned long lock_flags; |
203 | u32 i; |
204 | |
205 | for (i = 0; i < dev->num_frames; i++) |
206 | if (dev->frame[i].state == F_UNUSED) { |
207 | dev->frame[i].state = F_QUEUED; |
208 | spin_lock_irqsave(&dev->queue_lock, lock_flags); |
209 | list_add_tail(&dev->frame[i].frame, &dev->inqueue); |
210 | spin_unlock_irqrestore(&dev->queue_lock, lock_flags); |
211 | } |
212 | } |
213 | |
214 | /* |
215 | * em2820_release_buffers() |
216 | * free frame buffers |
217 | */ |
218 | void em2820_release_buffers(struct em2820 *dev) |
219 | { |
220 | if (dev->num_frames) { |
221 | rvfree(dev->frame[0].bufmem, |
222 | dev->num_frames * PAGE_ALIGN(dev->frame[0].buf.length)); |
223 | dev->num_frames = 0; |
224 | } |
225 | } |
226 | |
227 | /* |
228 | * em2820_read_reg_req() |
229 | * reads data from the usb device specifying bRequest |
230 | */ |
231 | int em2820_read_reg_req_len(struct em2820 *dev, u8 req, u16 reg, |
232 | char *buf, int len) |
233 | { |
234 | int ret, byte; |
235 | |
236 | em2820_regdbg("req=%02x, reg=%02x ", req, reg); |
237 | |
238 | ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req, |
239 | USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, |
240 | 0x0000, reg, buf, len, HZ); |
241 | |
242 | if (reg_debug){ |
243 | printk(ret < 0 ? " failed!\n" : "%02x values: ", ret); |
244 | for (byte = 0; byte < len; byte++) { |
245 | printk(" %02x", buf[byte]); |
246 | } |
247 | printk("\n"); |
248 | } |
249 | |
250 | return ret; |
251 | } |
252 | |
253 | /* |
254 | * em2820_read_reg_req() |
255 | * reads data from the usb device specifying bRequest |
256 | */ |
257 | int em2820_read_reg_req(struct em2820 *dev, u8 req, u16 reg) |
258 | { |
259 | u8 val; |
260 | int ret; |
261 | |
262 | em2820_regdbg("req=%02x, reg=%02x:", req, reg); |
263 | |
264 | ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req, |
265 | USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, |
266 | 0x0000, reg, &val, 1, HZ); |
267 | |
268 | if (reg_debug) |
269 | printk(ret < 0 ? " failed!\n" : "%02x\n", val); |
270 | |
271 | if (ret < 0) |
272 | return ret; |
273 | |
274 | return val; |
275 | } |
276 | |
277 | int em2820_read_reg(struct em2820 *dev, u16 reg) |
278 | { |
279 | return em2820_read_reg_req(dev, USB_REQ_GET_STATUS, reg); |
280 | } |
281 | |
282 | /* |
283 | * em2820_write_regs_req() |
284 | * sends data to the usb device, specifying bRequest |
285 | */ |
286 | int em2820_write_regs_req(struct em2820 *dev, u8 req, u16 reg, char *buf, |
287 | int len) |
288 | { |
289 | int ret; |
290 | |
291 | /*usb_control_msg seems to expect a kmalloced buffer */ |
292 | unsigned char *bufs = kmalloc(len, GFP_KERNEL); |
293 | |
294 | em2820_regdbg("req=%02x reg=%02x:", req, reg); |
295 | |
296 | if (reg_debug) { |
297 | int i; |
298 | for (i = 0; i < len; ++i) |
299 | printk (" %02x", (unsigned char)buf[i]); |
300 | printk ("\n"); |
301 | } |
302 | |
303 | if (!bufs) |
304 | return -ENOMEM; |
305 | memcpy(bufs, buf, len); |
306 | ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req, |
307 | USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, |
308 | 0x0000, reg, bufs, len, HZ); |
309 | mdelay(5); /* FIXME: magic number */ |
310 | kfree(bufs); |
311 | return ret; |
312 | } |
313 | |
314 | int em2820_write_regs(struct em2820 *dev, u16 reg, char *buf, int len) |
315 | { |
316 | return em2820_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len); |
317 | } |
318 | |
319 | /* |
320 | * em2820_write_reg_bits() |
321 | * sets only some bits (specified by bitmask) of a register, by first reading |
322 | * the actual value |
323 | */ |
324 | int em2820_write_reg_bits(struct em2820 *dev, u16 reg, u8 val, |
325 | u8 bitmask) |
326 | { |
327 | int oldval; |
328 | u8 newval; |
329 | if ((oldval = em2820_read_reg(dev, reg)) < 0) |
330 | return oldval; |
331 | newval = (((u8) oldval) & ~bitmask) | (val & bitmask); |
332 | return em2820_write_regs(dev, reg, &newval, 1); |
333 | } |
334 | |
335 | /* |
336 | * em2820_write_ac97() |
337 | * write a 16 bit value to the specified AC97 address (LSB first!) |
338 | */ |
339 | int em2820_write_ac97(struct em2820 *dev, u8 reg, u8 * val) |
340 | { |
341 | int ret; |
342 | u8 addr = reg & 0x7f; |
343 | if ((ret = em2820_write_regs(dev, AC97LSB_REG, val, 2)) < 0) |
344 | return ret; |
345 | if ((ret = em2820_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0) |
346 | return ret; |
347 | if ((ret = em2820_read_reg(dev, AC97BUSY_REG)) < 0) |
348 | return ret; |
349 | else if (((u8) ret) & 0x01) { |
350 | em2820_warn ("AC97 command still being exectuted: not handled properly!\n"); |
351 | } |
352 | return 0; |
353 | } |
354 | |
355 | int em2820_audio_analog_set(struct em2820 *dev) |
356 | { |
357 | char s[2] = { 0x00, 0x00 }; |
358 | s[0] |= 0x1f - dev->volume; |
359 | s[1] |= 0x1f - dev->volume; |
360 | if (dev->mute) |
361 | s[1] |= 0x80; |
362 | return em2820_write_ac97(dev, MASTER_AC97, s); |
363 | } |
364 | |
365 | |
366 | int em2820_colorlevels_set_default(struct em2820 *dev) |
367 | { |
368 | em2820_write_regs(dev, YGAIN_REG, "\x10", 1); /* contrast */ |
369 | em2820_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */ |
370 | em2820_write_regs(dev, UVGAIN_REG, "\x10", 1); /* saturation */ |
371 | em2820_write_regs(dev, UOFFSET_REG, "\x00", 1); |
372 | em2820_write_regs(dev, VOFFSET_REG, "\x00", 1); |
373 | em2820_write_regs(dev, SHARPNESS_REG, "\x00", 1); |
374 | |
375 | em2820_write_regs(dev, GAMMA_REG, "\x20", 1); |
376 | em2820_write_regs(dev, RGAIN_REG, "\x20", 1); |
377 | em2820_write_regs(dev, GGAIN_REG, "\x20", 1); |
378 | em2820_write_regs(dev, BGAIN_REG, "\x20", 1); |
379 | em2820_write_regs(dev, ROFFSET_REG, "\x00", 1); |
380 | em2820_write_regs(dev, GOFFSET_REG, "\x00", 1); |
381 | return em2820_write_regs(dev, BOFFSET_REG, "\x00", 1); |
382 | } |
383 | |
384 | int em2820_capture_start(struct em2820 *dev, int start) |
385 | { |
386 | int ret; |
387 | /* FIXME: which is the best order? */ |
388 | /* video registers are sampled by VREF */ |
389 | if ((ret = em2820_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00, |
390 | 0x10)) < 0) |
391 | return ret; |
392 | /* enable video capture */ |
393 | return em2820_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1); |
394 | } |
395 | |
396 | int em2820_outfmt_set_yuv422(struct em2820 *dev) |
397 | { |
398 | em2820_write_regs(dev, OUTFMT_REG, "\x34", 1); |
399 | em2820_write_regs(dev, VINMODE_REG, "\x10", 1); |
400 | return em2820_write_regs(dev, VINCTRL_REG, "\x11", 1); |
401 | } |
402 | |
403 | int em2820_accumulator_set(struct em2820 *dev, u8 xmin, u8 xmax, u8 ymin, |
404 | u8 ymax) |
405 | { |
406 | em2820_coredbg("em2820 Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax); |
407 | |
408 | em2820_write_regs(dev, XMIN_REG, &xmin, 1); |
409 | em2820_write_regs(dev, XMAX_REG, &xmax, 1); |
410 | em2820_write_regs(dev, YMIN_REG, &ymin, 1); |
411 | return em2820_write_regs(dev, YMAX_REG, &ymax, 1); |
412 | } |
413 | |
414 | int em2820_capture_area_set(struct em2820 *dev, u8 hstart, u8 vstart, |
415 | u16 width, u16 height) |
416 | { |
417 | u8 cwidth = width; |
418 | u8 cheight = height; |
419 | u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01); |
420 | |
421 | em2820_coredbg("em2820 Area Set: (%d,%d)\n", (width | (overflow & 2) << 7), |
422 | (height | (overflow & 1) << 8)); |
423 | |
424 | em2820_write_regs(dev, HSTART_REG, &hstart, 1); |
425 | em2820_write_regs(dev, VSTART_REG, &vstart, 1); |
426 | em2820_write_regs(dev, CWIDTH_REG, &cwidth, 1); |
427 | em2820_write_regs(dev, CHEIGHT_REG, &cheight, 1); |
428 | return em2820_write_regs(dev, OFLOW_REG, &overflow, 1); |
429 | } |
430 | |
431 | int em2820_scaler_set(struct em2820 *dev, u16 h, u16 v) |
432 | { |
433 | u8 buf[2]; |
434 | buf[0] = h; |
435 | buf[1] = h >> 8; |
436 | em2820_write_regs(dev, HSCALELOW_REG, (char *)buf, 2); |
437 | buf[0] = v; |
438 | buf[1] = v >> 8; |
439 | em2820_write_regs(dev, VSCALELOW_REG, (char *)buf, 2); |
440 | /* when H and V mixershould be used? */ |
441 | /* return em2820_write_reg_bits(dev, COMPR_REG, (h ? 0x20 : 0x00) | (v ? 0x10 : 0x00), 0x30); */ |
442 | /* it seems that both H and V scalers must be active to work correctly */ |
443 | return em2820_write_reg_bits(dev, COMPR_REG, h |
444 | || v ? 0x30 : 0x00, 0x30); |
445 | } |
446 | |
447 | /* FIXME: this only function read values from dev */ |
448 | int em2820_resolution_set(struct em2820 *dev) |
449 | { |
450 | int width, height; |
451 | width = norm_maxw(dev); |
452 | height = norm_maxh(dev) >> 1; |
453 | |
454 | em2820_outfmt_set_yuv422(dev); |
455 | em2820_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2); |
456 | em2820_capture_area_set(dev, 0, 0, width >> 2, height >> 2); |
457 | return em2820_scaler_set(dev, dev->hscale, dev->vscale); |
458 | } |
459 | |
460 | |
461 | /******************* isoc transfer handling ****************************/ |
462 | |
463 | #ifdef ENABLE_DEBUG_ISOC_FRAMES |
464 | static void em2820_isoc_dump(struct urb *urb, struct pt_regs *regs) |
465 | { |
466 | int len = 0; |
467 | int ntrans = 0; |
468 | int i; |
469 | |
470 | printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n", |
471 | urb->start_frame, urb->number_of_packets, |
472 | urb->error_count); |
473 | for (i = 0; i < urb->number_of_packets; i++) { |
474 | unsigned char *buf = |
475 | urb->transfer_buffer + |
476 | urb->iso_frame_desc[i].offset; |
477 | int alen = urb->iso_frame_desc[i].actual_length; |
478 | if (alen > 0) { |
479 | if (buf[0] == 0x88) { |
480 | ntrans++; |
481 | len += alen; |
482 | } else if (buf[0] == 0x22) { |
483 | printk(KERN_DEBUG |
484 | "= l=%d nt=%d bpp=%d\n", |
485 | len - 4 * ntrans, ntrans, |
486 | ntrans == 0 ? 0 : len / ntrans); |
487 | ntrans = 1; |
488 | len = alen; |
489 | } else |
490 | printk(KERN_DEBUG "!\n"); |
491 | } |
492 | printk(KERN_DEBUG " n=%d s=%d al=%d %x\n", i, |
493 | urb->iso_frame_desc[i].status, |
494 | urb->iso_frame_desc[i].actual_length, |
495 | (unsigned int) |
496 | *((unsigned char *)(urb->transfer_buffer + |
497 | urb->iso_frame_desc[i]. |
498 | offset))); |
499 | } |
500 | } |
501 | #endif |
502 | |
503 | static inline int em2820_isoc_video(struct em2820 *dev,struct em2820_frame_t **f, |
504 | unsigned long *lock_flags, unsigned char buf) |
505 | { |
506 | if (!(buf & 0x01)) { |
507 | if ((*f)->state == F_GRABBING) { |
508 | /*previous frame is incomplete */ |
509 | if ((*f)->fieldbytesused < dev->field_size) { |
510 | (*f)->state = F_ERROR; |
511 | em2820_isocdbg ("dropping incomplete bottom field (%i missing bytes)", |
512 | dev->field_size-(*f)->fieldbytesused); |
513 | } else { |
514 | (*f)->state = F_DONE; |
515 | (*f)->buf.bytesused = dev->frame_size; |
516 | } |
517 | } |
518 | if ((*f)->state == F_DONE || (*f)->state == F_ERROR) { |
519 | /* move current frame to outqueue and get next free buffer from inqueue */ |
520 | spin_lock_irqsave(&dev-> queue_lock, *lock_flags); |
521 | list_move_tail(&(*f)->frame, &dev->outqueue); |
522 | if (!list_empty(&dev->inqueue)) |
523 | (*f) = list_entry(dev-> inqueue.next, |
524 | struct em2820_frame_t,frame); |
525 | else |
526 | (*f) = NULL; |
527 | spin_unlock_irqrestore(&dev->queue_lock,*lock_flags); |
528 | } |
529 | if (!(*f)) { |
530 | em2820_isocdbg ("new frame but no buffer is free"); |
531 | return -1; |
532 | } |
533 | do_gettimeofday(&(*f)->buf.timestamp); |
534 | (*f)->buf.sequence = ++dev->frame_count; |
535 | (*f)->buf.field = V4L2_FIELD_INTERLACED; |
536 | (*f)->state = F_GRABBING; |
537 | (*f)->buf.bytesused = 0; |
538 | (*f)->top_field = 1; |
539 | (*f)->fieldbytesused = 0; |
540 | } else { |
541 | /* acquiring bottom field */ |
542 | if ((*f)->state == F_GRABBING) { |
543 | if (!(*f)->top_field) { |
544 | (*f)->state = F_ERROR; |
545 | em2820_isocdbg ("unexpected begin of bottom field; discarding it"); |
546 | } else if ((*f)-> fieldbytesused < dev->field_size - 172) { |
547 | (*f)->state = F_ERROR; |
548 | em2820_isocdbg ("dropping incomplete top field (%i missing bytes)", |
549 | dev->field_size-(*f)->fieldbytesused); |
550 | } else { |
551 | (*f)->top_field = 0; |
552 | (*f)->fieldbytesused = 0; |
553 | } |
554 | } |
555 | } |
556 | return (0); |
557 | } |
558 | |
559 | static inline void em2820_isoc_video_copy(struct em2820 *dev, |
560 | struct em2820_frame_t **f, unsigned char *buf, int len) |
561 | { |
562 | void *fieldstart, *startwrite, *startread; |
563 | int linesdone, currlinedone, offset, lencopy,remain; |
564 | |
565 | if ((*f)->fieldbytesused + len > dev->field_size) |
566 | len =dev->field_size - (*f)->fieldbytesused; |
567 | remain = len; |
568 | startread = buf + 4; |
569 | if ((*f)->top_field) |
570 | fieldstart = (*f)->bufmem; |
571 | else |
572 | fieldstart = (*f)->bufmem + dev->bytesperline; |
573 | |
574 | linesdone = (*f)->fieldbytesused / dev->bytesperline; |
575 | currlinedone = (*f)->fieldbytesused % dev->bytesperline; |
576 | offset = linesdone * dev->bytesperline * 2 + currlinedone; |
577 | startwrite = fieldstart + offset; |
578 | lencopy = dev->bytesperline - currlinedone; |
579 | lencopy = lencopy > remain ? remain : lencopy; |
580 | |
581 | memcpy(startwrite, startread, lencopy); |
582 | remain -= lencopy; |
583 | |
584 | while (remain > 0) { |
585 | startwrite += lencopy + dev->bytesperline; |
586 | startread += lencopy; |
587 | if (dev->bytesperline > remain) |
588 | lencopy = remain; |
589 | else |
590 | lencopy = dev->bytesperline; |
591 | |
592 | memcpy(startwrite, startread, lencopy); |
593 | remain -= lencopy; |
594 | } |
595 | |
596 | (*f)->fieldbytesused += len; |
597 | } |
598 | |
599 | /* |
600 | * em2820_isoIrq() |
601 | * handles the incoming isoc urbs and fills the frames from our inqueue |
602 | */ |
603 | void em2820_isocIrq(struct urb *urb, struct pt_regs *regs) |
604 | { |
605 | struct em2820 *dev = urb->context; |
606 | int i, status; |
607 | struct em2820_frame_t **f; |
608 | unsigned long lock_flags; |
609 | |
610 | if (!dev) |
611 | return; |
612 | #ifdef ENABLE_DEBUG_ISOC_FRAMES |
613 | if (isoc_debug>1) |
614 | em2820_isoc_dump(urb, regs); |
615 | #endif |
616 | |
617 | if (urb->status == -ENOENT) |
618 | return; |
619 | |
620 | f = &dev->frame_current; |
621 | |
622 | if (dev->stream == STREAM_INTERRUPT) { |
623 | dev->stream = STREAM_OFF; |
624 | if ((*f)) |
625 | (*f)->state = F_QUEUED; |
626 | em2820_isocdbg("stream interrupted"); |
627 | wake_up_interruptible(&dev->wait_stream); |
628 | } |
629 | |
630 | if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED)) |
631 | return; |
632 | |
633 | if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) { |
634 | if (!(*f)) |
635 | (*f) = list_entry(dev->inqueue.next, |
636 | struct em2820_frame_t, frame); |
637 | |
638 | for (i = 0; i < urb->number_of_packets; i++) { |
639 | unsigned char *buf = urb->transfer_buffer + |
640 | urb->iso_frame_desc[i].offset; |
641 | int len = urb->iso_frame_desc[i].actual_length - 4; |
642 | |
643 | if (urb->iso_frame_desc[i].status) { |
644 | em2820_isocdbg("data error: [%d] len=%d, status=%d", i, |
645 | urb->iso_frame_desc[i].actual_length, |
646 | urb->iso_frame_desc[i].status); |
647 | continue; |
648 | } |
649 | if (urb->iso_frame_desc[i].actual_length <= 0) { |
650 | em2820_isocdbg("packet %d is empty",i); |
651 | continue; |
652 | } |
653 | if (urb->iso_frame_desc[i].actual_length > |
654 | dev->max_pkt_size) { |
655 | em2820_isocdbg("packet bigger than packet size"); |
656 | continue; |
657 | } |
658 | /*new frame */ |
659 | if (buf[0] == 0x22 && buf[1] == 0x5a) { |
660 | em2820_isocdbg("Video frame, length=%i!",len); |
661 | |
662 | if (em2820_isoc_video(dev,f,&lock_flags,buf[2])) |
663 | break; |
664 | } else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) { |
665 | em2820_isocdbg("VBI HEADER!!!"); |
666 | } |
667 | |
668 | /* actual copying */ |
669 | if ((*f)->state == F_GRABBING) { |
670 | em2820_isoc_video_copy(dev,f,buf, len); |
671 | } |
672 | } |
673 | } |
674 | |
675 | for (i = 0; i < urb->number_of_packets; i++) { |
676 | urb->iso_frame_desc[i].status = 0; |
677 | urb->iso_frame_desc[i].actual_length = 0; |
678 | } |
679 | |
680 | urb->status = 0; |
681 | if ((status = usb_submit_urb(urb, GFP_ATOMIC))) { |
682 | em2820_errdev("resubmit of urb failed (error=%i)\n", status); |
683 | dev->state |= DEV_MISCONFIGURED; |
684 | } |
685 | wake_up_interruptible(&dev->wait_frame); |
686 | return; |
687 | } |
688 | |
689 | /* |
690 | * em2820_uninit_isoc() |
691 | * deallocates the buffers and urbs allocated during em2820_init_iosc() |
692 | */ |
693 | void em2820_uninit_isoc(struct em2820 *dev) |
694 | { |
695 | int i; |
696 | |
697 | for (i = 0; i < EM2820_NUM_BUFS; i++) { |
698 | if (dev->urb[i]) { |
699 | usb_kill_urb(dev->urb[i]); |
700 | usb_free_urb(dev->urb[i]); |
701 | } |
702 | dev->urb[i] = NULL; |
703 | if (dev->transfer_buffer[i]) |
704 | kfree(dev->transfer_buffer[i]); |
705 | dev->transfer_buffer[i] = NULL; |
706 | } |
707 | em2820_capture_start(dev, 0); |
708 | } |
709 | |
710 | /* |
711 | * em2820_init_isoc() |
712 | * allocates transfer buffers and submits the urbs for isoc transfer |
713 | */ |
714 | int em2820_init_isoc(struct em2820 *dev) |
715 | { |
716 | /* change interface to 3 which allowes the biggest packet sizes */ |
717 | int i, errCode; |
718 | const int sb_size = EM2820_NUM_PACKETS * dev->max_pkt_size; |
719 | |
720 | /* reset streaming vars */ |
721 | dev->frame_current = NULL; |
722 | dev->frame_count = 0; |
723 | |
724 | /* allocate urbs */ |
725 | for (i = 0; i < EM2820_NUM_BUFS; i++) { |
726 | struct urb *urb; |
727 | int j, k; |
728 | /* allocate transfer buffer */ |
729 | dev->transfer_buffer[i] = kmalloc(sb_size, GFP_KERNEL); |
730 | if (!dev->transfer_buffer[i]) { |
731 | em2820_errdev |
732 | ("unable to allocate %i bytes for transfer buffer %i\n", |
733 | sb_size, i); |
734 | em2820_uninit_isoc(dev); |
735 | return -ENOMEM; |
736 | } |
737 | memset(dev->transfer_buffer[i], 0, sb_size); |
738 | urb = usb_alloc_urb(EM2820_NUM_PACKETS, GFP_KERNEL); |
739 | if (urb) { |
740 | urb->dev = dev->udev; |
741 | urb->context = dev; |
742 | urb->pipe = usb_rcvisocpipe(dev->udev, 0x82); |
743 | urb->transfer_flags = URB_ISO_ASAP; |
744 | urb->interval = 1; |
745 | urb->transfer_buffer = dev->transfer_buffer[i]; |
746 | urb->complete = em2820_isocIrq; |
747 | urb->number_of_packets = EM2820_NUM_PACKETS; |
748 | urb->transfer_buffer_length = sb_size; |
749 | for (j = k = 0; j < EM2820_NUM_PACKETS; |
750 | j++, k += dev->max_pkt_size) { |
751 | urb->iso_frame_desc[j].offset = k; |
752 | urb->iso_frame_desc[j].length = |
753 | dev->max_pkt_size; |
754 | } |
755 | dev->urb[i] = urb; |
756 | } else { |
757 | em2820_errdev("cannot alloc urb %i\n", i); |
758 | em2820_uninit_isoc(dev); |
759 | return -ENOMEM; |
760 | } |
761 | } |
762 | |
763 | /* submit urbs */ |
764 | for (i = 0; i < EM2820_NUM_BUFS; i++) { |
765 | errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL); |
766 | if (errCode) { |
767 | em2820_errdev("submit of urb %i failed (error=%i)\n", i, |
768 | errCode); |
769 | em2820_uninit_isoc(dev); |
770 | return errCode; |
771 | } |
772 | } |
773 | |
774 | return 0; |
775 | } |
776 | |
777 | int em2820_set_alternate(struct em2820 *dev) |
778 | { |
779 | int errCode, prev_alt = dev->alt; |
780 | dev->alt = alt; |
781 | if (dev->alt == 0) { |
782 | int i; |
783 | unsigned int min_pkt_size = dev->field_size / 137; /* FIXME: empiric magic number */ |
784 | em2820_coredbg("minimum isoc packet size: %u", min_pkt_size); |
785 | dev->alt = 7; |
786 | for (i = 1; i < EM2820_MAX_ALT; i += 2) /* FIXME: skip even alternate: why do they not work? */ |
787 | if (dev->alt_max_pkt_size[i] >= min_pkt_size) { |
788 | dev->alt = i; |
789 | break; |
790 | } |
791 | } |
792 | |
793 | if (dev->alt != prev_alt) { |
794 | dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt]; |
795 | em2820_coredbg("setting alternate %d with wMaxPacketSize=%u", dev->alt, |
796 | dev->max_pkt_size); |
797 | errCode = usb_set_interface(dev->udev, 0, dev->alt); |
798 | if (errCode < 0) { |
799 | em2820_errdev |
800 | ("cannot change alternate number to %d (error=%i)\n", |
801 | dev->alt, errCode); |
802 | return errCode; |
803 | } |
804 | } |
805 | return 0; |
806 | } |