2 em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
4 Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
5 Markus Rechberger <mrechberger@gmail.com>
6 Mauro Carvalho Chehab <mchehab@infradead.org>
7 Sascha Sommer <saschasommer@freenet.de>
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/init.h>
25 #include <linux/list.h>
26 #include <linux/module.h>
27 #include <linux/usb.h>
28 #include <linux/vmalloc.h>
32 /* #define ENABLE_DEBUG_ISOC_FRAMES */
34 static unsigned int core_debug;
35 module_param(core_debug,int,0644);
36 MODULE_PARM_DESC(core_debug,"enable debug messages [core]");
38 #define em28xx_coredbg(fmt, arg...) do {\
40 printk(KERN_INFO "%s %s :"fmt, \
41 dev->name, __func__ , ##arg); } while (0)
43 static unsigned int reg_debug;
44 module_param(reg_debug,int,0644);
45 MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");
47 #define em28xx_regdbg(fmt, arg...) do {\
49 printk(KERN_INFO "%s %s :"fmt, \
50 dev->name, __func__ , ##arg); } while (0)
52 static int alt = EM28XX_PINOUT;
53 module_param(alt, int, 0644);
54 MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
57 #define em28xx_isocdbg(fmt, arg...) do {\
59 printk(KERN_INFO "%s %s :"fmt, \
60 dev->name, __func__ , ##arg); } while (0)
63 * em28xx_read_reg_req()
64 * reads data from the usb device specifying bRequest
66 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
71 if (dev->state & DEV_DISCONNECTED)
74 if (len > URB_MAX_CTRL_SIZE)
77 em28xx_regdbg("req=%02x, reg=%02x ", req, reg);
79 mutex_lock(&dev->ctrl_urb_lock);
80 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
81 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
82 0x0000, reg, dev->urb_buf, len, HZ);
86 mutex_unlock(&dev->ctrl_urb_lock);
91 memcpy(buf, dev->urb_buf, len);
93 mutex_unlock(&dev->ctrl_urb_lock);
96 printk("%02x values: ", ret);
97 for (byte = 0; byte < len; byte++)
98 printk(" %02x", (unsigned char)buf[byte]);
106 * em28xx_read_reg_req()
107 * reads data from the usb device specifying bRequest
109 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
114 if (dev->state & DEV_DISCONNECTED)
117 em28xx_regdbg("req=%02x, reg=%02x:", req, reg);
119 mutex_lock(&dev->ctrl_urb_lock);
120 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
121 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
122 0x0000, reg, dev->urb_buf, 1, HZ);
123 val = dev->urb_buf[0];
124 mutex_unlock(&dev->ctrl_urb_lock);
127 printk(" failed!\n");
132 printk("%02x\n", (unsigned char) val);
137 int em28xx_read_reg(struct em28xx *dev, u16 reg)
139 return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
143 * em28xx_write_regs_req()
144 * sends data to the usb device, specifying bRequest
146 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
151 if (dev->state & DEV_DISCONNECTED)
154 if ((len < 1) || (len > URB_MAX_CTRL_SIZE))
157 em28xx_regdbg("req=%02x reg=%02x:", req, reg);
160 for (i = 0; i < len; ++i)
161 printk(" %02x", (unsigned char)buf[i]);
165 mutex_lock(&dev->ctrl_urb_lock);
166 memcpy(dev->urb_buf, buf, len);
167 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req,
168 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
169 0x0000, reg, dev->urb_buf, len, HZ);
170 mutex_unlock(&dev->ctrl_urb_lock);
172 if (dev->wait_after_write)
173 msleep(dev->wait_after_write);
178 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
182 rc = em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
184 /* Stores GPO/GPIO values at the cache, if changed
185 Only write values should be stored, since input on a GPIO
186 register will return the input bits.
187 Not sure what happens on reading GPO register.
190 if (reg == dev->reg_gpo_num)
191 dev->reg_gpo = buf[0];
192 else if (reg == dev->reg_gpio_num)
193 dev->reg_gpio = buf[0];
199 /* Write a single register */
200 int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
202 return em28xx_write_regs(dev, reg, &val, 1);
206 * em28xx_write_reg_bits()
207 * sets only some bits (specified by bitmask) of a register, by first reading
210 static int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
216 /* Uses cache for gpo/gpio registers */
217 if (reg == dev->reg_gpo_num)
218 oldval = dev->reg_gpo;
219 else if (reg == dev->reg_gpio_num)
220 oldval = dev->reg_gpio;
222 oldval = em28xx_read_reg(dev, reg);
227 newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
229 return em28xx_write_regs(dev, reg, &newval, 1);
233 * em28xx_is_ac97_ready()
234 * Checks if ac97 is ready
236 static int em28xx_is_ac97_ready(struct em28xx *dev)
240 /* Wait up to 50 ms for AC97 command to complete */
241 for (i = 0; i < 10; i++, msleep(5)) {
242 ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
250 em28xx_warn("AC97 command still being executed: not handled properly!\n");
256 * write a 16 bit value to the specified AC97 address (LSB first!)
258 static int em28xx_read_ac97(struct em28xx *dev, u8 reg)
261 u8 addr = (reg & 0x7f) | 0x80;
264 ret = em28xx_is_ac97_ready(dev);
268 ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
272 ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
273 (u8 *)&val, sizeof(val));
277 return le16_to_cpu(val);
281 * em28xx_write_ac97()
282 * write a 16 bit value to the specified AC97 address (LSB first!)
284 static int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
287 u8 addr = reg & 0x7f;
290 value = cpu_to_le16(val);
292 ret = em28xx_is_ac97_ready(dev);
296 ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *) &value, 2);
300 ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
307 struct em28xx_vol_table {
308 enum em28xx_amux mux;
312 static struct em28xx_vol_table inputs[] = {
313 { EM28XX_AMUX_VIDEO, AC97_VIDEO_VOL },
314 { EM28XX_AMUX_LINE_IN, AC97_LINEIN_VOL },
315 { EM28XX_AMUX_PHONE, AC97_PHONE_VOL },
316 { EM28XX_AMUX_MIC, AC97_MIC_VOL },
317 { EM28XX_AMUX_CD, AC97_CD_VOL },
318 { EM28XX_AMUX_AUX, AC97_AUX_VOL },
319 { EM28XX_AMUX_PCM_OUT, AC97_PCM_OUT_VOL },
322 static int set_ac97_input(struct em28xx *dev)
325 enum em28xx_amux amux = dev->ctl_ainput;
327 /* EM28XX_AMUX_VIDEO2 is a special case used to indicate that
328 em28xx should point to LINE IN, while AC97 should use VIDEO
330 if (amux == EM28XX_AMUX_VIDEO2)
331 amux = EM28XX_AMUX_VIDEO;
333 /* Mute all entres but the one that were selected */
334 for (i = 0; i < ARRAY_SIZE(inputs); i++) {
335 if (amux == inputs[i].mux)
336 ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
338 ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
341 em28xx_warn("couldn't setup AC97 register %d\n",
347 static int em28xx_set_audio_source(struct em28xx *dev)
352 if (dev->board.is_em2800) {
353 if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
354 input = EM2800_AUDIO_SRC_TUNER;
356 input = EM2800_AUDIO_SRC_LINE;
358 ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
363 if (dev->board.has_msp34xx)
364 input = EM28XX_AUDIO_SRC_TUNER;
366 switch (dev->ctl_ainput) {
367 case EM28XX_AMUX_VIDEO:
368 input = EM28XX_AUDIO_SRC_TUNER;
371 input = EM28XX_AUDIO_SRC_LINE;
376 ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
381 switch (dev->audio_mode.ac97) {
385 ret = set_ac97_input(dev);
391 struct em28xx_vol_table outputs[] = {
392 { EM28XX_AOUT_MASTER, AC97_MASTER_VOL },
393 { EM28XX_AOUT_LINE, AC97_LINE_LEVEL_VOL },
394 { EM28XX_AOUT_MONO, AC97_MASTER_MONO_VOL },
395 { EM28XX_AOUT_LFE, AC97_LFE_MASTER_VOL },
396 { EM28XX_AOUT_SURR, AC97_SURR_MASTER_VOL },
399 int em28xx_audio_analog_set(struct em28xx *dev)
404 if (!dev->audio_mode.has_audio)
407 /* It is assumed that all devices use master volume for output.
408 It would be possible to use also line output.
410 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
411 /* Mute all outputs */
412 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
413 ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
415 em28xx_warn("couldn't setup AC97 register %d\n",
420 xclk = dev->board.xclk & 0x7f;
424 ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
429 /* Selects the proper audio input */
430 ret = em28xx_set_audio_source(dev);
433 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
436 /* LSB: left channel - both channels with the same level */
437 vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
439 /* Mute device, if needed */
444 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
445 if (dev->ctl_aoutput & outputs[i].mux)
446 ret = em28xx_write_ac97(dev, outputs[i].reg,
449 em28xx_warn("couldn't setup AC97 register %d\n",
456 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
458 int em28xx_audio_setup(struct em28xx *dev)
460 int vid1, vid2, feat, cfg;
463 if (dev->chip_id == CHIP_ID_EM2874) {
464 /* Digital only device - don't load any alsa module */
465 dev->audio_mode.has_audio = 0;
466 dev->has_audio_class = 0;
467 dev->has_alsa_audio = 0;
471 /* If device doesn't support Usb Audio Class, use vendor class */
472 if (!dev->has_audio_class)
473 dev->has_alsa_audio = 1;
475 dev->audio_mode.has_audio = 1;
477 /* See how this device is configured */
478 cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
480 cfg = EM28XX_CHIPCFG_AC97; /* Be conservative */
482 em28xx_info("Config register raw data: 0x%02x\n", cfg);
484 if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
485 EM28XX_CHIPCFG_I2S_3_SAMPRATES) {
486 em28xx_info("I2S Audio (3 sample rates)\n");
487 dev->audio_mode.i2s_3rates = 1;
489 if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
490 EM28XX_CHIPCFG_I2S_5_SAMPRATES) {
491 em28xx_info("I2S Audio (5 sample rates)\n");
492 dev->audio_mode.i2s_5rates = 1;
495 if (!(cfg & EM28XX_CHIPCFG_AC97)) {
496 dev->audio_mode.ac97 = EM28XX_NO_AC97;
500 dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
502 vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
504 /* Device likely doesn't support AC97 */
505 em28xx_warn("AC97 chip type couldn't be determined\n");
509 vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
513 vid = vid1 << 16 | vid2;
515 dev->audio_mode.ac97_vendor_id = vid;
516 em28xx_warn("AC97 vendor ID = 0x%08x\n", vid);
518 feat = em28xx_read_ac97(dev, AC97_RESET);
522 dev->audio_mode.ac97_feat = feat;
523 em28xx_warn("AC97 features = 0x%04x\n", feat);
525 /* Try to identify what audio processor we have */
526 if ((vid == 0xffffffff) && (feat == 0x6a90))
527 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
528 else if ((vid >> 8) == 0x838476)
529 dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
532 /* Reports detected AC97 processor */
533 switch (dev->audio_mode.ac97) {
535 em28xx_info("No AC97 audio processor\n");
537 case EM28XX_AC97_EM202:
538 em28xx_info("Empia 202 AC97 audio processor detected\n");
540 case EM28XX_AC97_SIGMATEL:
541 em28xx_info("Sigmatel audio processor detected(stac 97%02x)\n",
542 dev->audio_mode.ac97_vendor_id & 0xff);
544 case EM28XX_AC97_OTHER:
545 em28xx_warn("Unknown AC97 audio processor detected!\n");
551 return em28xx_audio_analog_set(dev);
553 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
555 int em28xx_colorlevels_set_default(struct em28xx *dev)
557 em28xx_write_reg(dev, EM28XX_R20_YGAIN, 0x10); /* contrast */
558 em28xx_write_reg(dev, EM28XX_R21_YOFFSET, 0x00); /* brightness */
559 em28xx_write_reg(dev, EM28XX_R22_UVGAIN, 0x10); /* saturation */
560 em28xx_write_reg(dev, EM28XX_R23_UOFFSET, 0x00);
561 em28xx_write_reg(dev, EM28XX_R24_VOFFSET, 0x00);
562 em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, 0x00);
564 em28xx_write_reg(dev, EM28XX_R14_GAMMA, 0x20);
565 em28xx_write_reg(dev, EM28XX_R15_RGAIN, 0x20);
566 em28xx_write_reg(dev, EM28XX_R16_GGAIN, 0x20);
567 em28xx_write_reg(dev, EM28XX_R17_BGAIN, 0x20);
568 em28xx_write_reg(dev, EM28XX_R18_ROFFSET, 0x00);
569 em28xx_write_reg(dev, EM28XX_R19_GOFFSET, 0x00);
570 return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
573 int em28xx_capture_start(struct em28xx *dev, int start)
577 if (dev->chip_id == CHIP_ID_EM2874) {
578 /* The Transport Stream Enable Register moved in em2874 */
580 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
582 EM2874_TS1_CAPTURE_ENABLE);
586 /* Enable Transport Stream */
587 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
588 EM2874_TS1_CAPTURE_ENABLE,
589 EM2874_TS1_CAPTURE_ENABLE);
594 /* FIXME: which is the best order? */
595 /* video registers are sampled by VREF */
596 rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
597 start ? 0x10 : 0x00, 0x10);
602 /* disable video capture */
603 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
607 /* enable video capture */
608 rc = em28xx_write_reg(dev, 0x48, 0x00);
610 if (dev->mode == EM28XX_ANALOG_MODE)
611 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
613 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
620 int em28xx_outfmt_set_yuv422(struct em28xx *dev)
622 em28xx_write_reg(dev, EM28XX_R27_OUTFMT, 0x34);
623 em28xx_write_reg(dev, EM28XX_R10_VINMODE, 0x10);
624 return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, 0x11);
627 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
630 em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
631 xmin, ymin, xmax, ymax);
633 em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
634 em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
635 em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
636 return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
639 static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
640 u16 width, u16 height)
644 u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
646 em28xx_coredbg("em28xx Area Set: (%d,%d)\n",
647 (width | (overflow & 2) << 7),
648 (height | (overflow & 1) << 8));
650 em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
651 em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
652 em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
653 em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
654 return em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
657 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
660 /* the em2800 scaler only supports scaling down to 50% */
661 if (dev->board.is_em2800)
662 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
667 em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);
670 em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
671 /* it seems that both H and V scalers must be active
673 mode = (h || v)? 0x30: 0x00;
675 return em28xx_write_reg_bits(dev, EM28XX_R26_COMPR, mode, 0x30);
678 /* FIXME: this only function read values from dev */
679 int em28xx_resolution_set(struct em28xx *dev)
682 width = norm_maxw(dev);
683 height = norm_maxh(dev) >> 1;
685 em28xx_outfmt_set_yuv422(dev);
686 em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
687 em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
688 return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
691 int em28xx_set_alternate(struct em28xx *dev)
693 int errCode, prev_alt = dev->alt;
695 unsigned int min_pkt_size = dev->width * 2 + 4;
697 /* When image size is bigger than a certain value,
698 the frame size should be increased, otherwise, only
699 green screen will be received.
701 if (dev->width * 2 * dev->height > 720 * 240 * 2)
704 for (i = 0; i < dev->num_alt; i++) {
705 /* stop when the selected alt setting offers enough bandwidth */
706 if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
709 /* otherwise make sure that we end up with the maximum bandwidth
710 because the min_pkt_size equation might be wrong...
712 } else if (dev->alt_max_pkt_size[i] >
713 dev->alt_max_pkt_size[dev->alt])
717 if (dev->alt != prev_alt) {
718 em28xx_coredbg("minimum isoc packet size: %u (alt=%d)\n",
719 min_pkt_size, dev->alt);
720 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
721 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n",
722 dev->alt, dev->max_pkt_size);
723 errCode = usb_set_interface(dev->udev, 0, dev->alt);
725 em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
733 int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
740 em28xx_write_reg(dev, 0x48, 0x00);
741 if (dev->mode == EM28XX_ANALOG_MODE)
742 em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
744 em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
747 /* Send GPIO reset sequences specified at board entry */
748 while (gpio->sleep >= 0) {
749 if (gpio->reg >= 0) {
750 rc = em28xx_write_reg_bits(dev,
765 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
767 if (dev->mode == set_mode)
770 if (set_mode == EM28XX_MODE_UNDEFINED) {
771 dev->mode = set_mode;
775 dev->mode = set_mode;
777 if (dev->mode == EM28XX_DIGITAL_MODE)
778 return em28xx_gpio_set(dev, dev->board.dvb_gpio);
780 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
782 EXPORT_SYMBOL_GPL(em28xx_set_mode);
784 /* ------------------------------------------------------------------
786 ------------------------------------------------------------------*/
789 * IRQ callback, called by URB callback
791 static void em28xx_irq_callback(struct urb *urb)
793 struct em28xx_dmaqueue *dma_q = urb->context;
794 struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
797 /* Copy data from URB */
798 spin_lock(&dev->slock);
799 rc = dev->isoc_ctl.isoc_copy(dev, urb);
800 spin_unlock(&dev->slock);
802 /* Reset urb buffers */
803 for (i = 0; i < urb->number_of_packets; i++) {
804 urb->iso_frame_desc[i].status = 0;
805 urb->iso_frame_desc[i].actual_length = 0;
809 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
811 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
817 * Stop and Deallocate URBs
819 void em28xx_uninit_isoc(struct em28xx *dev)
824 em28xx_isocdbg("em28xx: called em28xx_uninit_isoc\n");
826 dev->isoc_ctl.nfields = -1;
827 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
828 urb = dev->isoc_ctl.urb[i];
832 if (dev->isoc_ctl.transfer_buffer[i]) {
833 usb_buffer_free(dev->udev,
834 urb->transfer_buffer_length,
835 dev->isoc_ctl.transfer_buffer[i],
839 dev->isoc_ctl.urb[i] = NULL;
841 dev->isoc_ctl.transfer_buffer[i] = NULL;
844 kfree(dev->isoc_ctl.urb);
845 kfree(dev->isoc_ctl.transfer_buffer);
847 dev->isoc_ctl.urb = NULL;
848 dev->isoc_ctl.transfer_buffer = NULL;
849 dev->isoc_ctl.num_bufs = 0;
851 em28xx_capture_start(dev, 0);
853 EXPORT_SYMBOL_GPL(em28xx_uninit_isoc);
856 * Allocate URBs and start IRQ
858 int em28xx_init_isoc(struct em28xx *dev, int max_packets,
859 int num_bufs, int max_pkt_size,
860 int (*isoc_copy) (struct em28xx *dev, struct urb *urb))
862 struct em28xx_dmaqueue *dma_q = &dev->vidq;
869 em28xx_isocdbg("em28xx: called em28xx_prepare_isoc\n");
871 /* De-allocates all pending stuff */
872 em28xx_uninit_isoc(dev);
874 dev->isoc_ctl.isoc_copy = isoc_copy;
875 dev->isoc_ctl.num_bufs = num_bufs;
877 dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs, GFP_KERNEL);
878 if (!dev->isoc_ctl.urb) {
879 em28xx_errdev("cannot alloc memory for usb buffers\n");
883 dev->isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
885 if (!dev->isoc_ctl.transfer_buffer) {
886 em28xx_errdev("cannot allocate memory for usbtransfer\n");
887 kfree(dev->isoc_ctl.urb);
891 dev->isoc_ctl.max_pkt_size = max_pkt_size;
892 dev->isoc_ctl.buf = NULL;
894 sb_size = max_packets * dev->isoc_ctl.max_pkt_size;
896 /* allocate urbs and transfer buffers */
897 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
898 urb = usb_alloc_urb(max_packets, GFP_KERNEL);
900 em28xx_err("cannot alloc isoc_ctl.urb %i\n", i);
901 em28xx_uninit_isoc(dev);
904 dev->isoc_ctl.urb[i] = urb;
906 dev->isoc_ctl.transfer_buffer[i] = usb_buffer_alloc(dev->udev,
907 sb_size, GFP_KERNEL, &urb->transfer_dma);
908 if (!dev->isoc_ctl.transfer_buffer[i]) {
909 em28xx_err("unable to allocate %i bytes for transfer"
912 in_interrupt()?" while in int":"");
913 em28xx_uninit_isoc(dev);
916 memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size);
918 /* FIXME: this is a hack - should be
919 'desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK'
920 should also be using 'desc.bInterval'
922 pipe = usb_rcvisocpipe(dev->udev,
923 dev->mode == EM28XX_ANALOG_MODE ? 0x82 : 0x84);
925 usb_fill_int_urb(urb, dev->udev, pipe,
926 dev->isoc_ctl.transfer_buffer[i], sb_size,
927 em28xx_irq_callback, dma_q, 1);
929 urb->number_of_packets = max_packets;
930 urb->transfer_flags = URB_ISO_ASAP;
933 for (j = 0; j < max_packets; j++) {
934 urb->iso_frame_desc[j].offset = k;
935 urb->iso_frame_desc[j].length =
936 dev->isoc_ctl.max_pkt_size;
937 k += dev->isoc_ctl.max_pkt_size;
941 init_waitqueue_head(&dma_q->wq);
943 em28xx_capture_start(dev, 1);
945 /* submit urbs and enables IRQ */
946 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
947 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_ATOMIC);
949 em28xx_err("submit of urb %i failed (error=%i)\n", i,
951 em28xx_uninit_isoc(dev);
958 EXPORT_SYMBOL_GPL(em28xx_init_isoc);