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];
200 * em28xx_write_reg_bits()
201 * sets only some bits (specified by bitmask) of a register, by first reading
204 static int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
210 /* Uses cache for gpo/gpio registers */
211 if (reg == dev->reg_gpo_num)
212 oldval = dev->reg_gpo;
213 else if (reg == dev->reg_gpio_num)
214 oldval = dev->reg_gpio;
216 oldval = em28xx_read_reg(dev, reg);
221 newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
223 return em28xx_write_regs(dev, reg, &newval, 1);
227 * em28xx_is_ac97_ready()
228 * Checks if ac97 is ready
230 static int em28xx_is_ac97_ready(struct em28xx *dev)
234 /* Wait up to 50 ms for AC97 command to complete */
235 for (i = 0; i < 10; i++, msleep(5)) {
236 ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
244 em28xx_warn("AC97 command still being executed: not handled properly!\n");
250 * write a 16 bit value to the specified AC97 address (LSB first!)
252 static int em28xx_read_ac97(struct em28xx *dev, u8 reg)
255 u8 addr = (reg & 0x7f) | 0x80;
258 ret = em28xx_is_ac97_ready(dev);
262 ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
266 ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
267 (u8 *)&val, sizeof(val));
271 return le16_to_cpu(val);
275 * em28xx_write_ac97()
276 * write a 16 bit value to the specified AC97 address (LSB first!)
278 static int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
281 u8 addr = reg & 0x7f;
284 value = cpu_to_le16(val);
286 ret = em28xx_is_ac97_ready(dev);
290 ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *) &value, 2);
294 ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
301 static int set_ac97_em202_input(struct em28xx *dev)
304 u16 enable = 0x0808; /* 12 dB attenuation Left/Right */
305 u16 disable = 0x8808; /* bit 15 - mute volumme */
308 if (dev->ctl_ainput == EM28XX_AMUX_VIDEO) {
316 /* Sets em202 AC97 mixer registers */
317 ret = em28xx_write_ac97(dev, AC97_VIDEO_VOL, video);
321 ret = em28xx_write_ac97(dev, AC97_LINEIN_VOL, line);
326 static int em28xx_set_audio_source(struct em28xx *dev)
331 if (dev->is_em2800) {
333 input = EM2800_AUDIO_SRC_LINE;
335 input = EM2800_AUDIO_SRC_TUNER;
337 ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
342 if (dev->has_msp34xx)
343 input = EM28XX_AUDIO_SRC_TUNER;
345 switch (dev->ctl_ainput) {
346 case EM28XX_AMUX_VIDEO:
347 input = EM28XX_AUDIO_SRC_TUNER;
350 input = EM28XX_AUDIO_SRC_LINE;
355 ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
360 switch (dev->audio_mode.ac97) {
363 case EM28XX_AC97_OTHER:
364 /* We don't know how to handle this chip.
365 Let's hope it is close enough to em202 to work
367 case EM28XX_AC97_EM202:
368 ret = set_ac97_em202_input(dev);
375 int em28xx_audio_analog_set(struct em28xx *dev)
380 if (!dev->audio_mode.has_audio)
383 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
385 ret = em28xx_write_ac97(dev, AC97_MASTER_VOL, 0x8000);
391 if (dev->has_12mhz_i2s)
397 ret = em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, xclk, 0xa7);
402 /* Selects the proper audio input */
403 ret = em28xx_set_audio_source(dev);
406 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
409 /* LSB: left channel - both channels with the same level */
410 vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
412 /* Mute device, if needed */
417 ret = em28xx_write_ac97(dev, AC97_MASTER_VOL, vol);
422 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
424 int em28xx_audio_setup(struct em28xx *dev)
426 int vid1, vid2, feat, cfg;
428 if (dev->chip_id == CHIP_ID_EM2874) {
429 /* Digital only device - don't load any alsa module */
430 dev->audio_mode.has_audio = 0;
431 dev->has_audio_class = 0;
432 dev->has_alsa_audio = 0;
436 /* If device doesn't support Usb Audio Class, use vendor class */
437 if (!dev->has_audio_class)
438 dev->has_alsa_audio = 1;
440 dev->audio_mode.has_audio = 1;
442 /* See how this device is configured */
443 cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
445 cfg = EM28XX_CHIPCFG_AC97; /* Be conservative */
447 em28xx_info("Config register raw data: 0x%02x\n", cfg);
449 if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
450 EM28XX_CHIPCFG_I2S_3_SAMPRATES) {
451 em28xx_info("I2S Audio (3 sample rates)\n");
452 dev->audio_mode.i2s_3rates = 1;
454 if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
455 EM28XX_CHIPCFG_I2S_5_SAMPRATES) {
456 em28xx_info("I2S Audio (5 sample rates)\n");
457 dev->audio_mode.i2s_5rates = 1;
460 if (!(cfg & EM28XX_CHIPCFG_AC97)) {
461 dev->audio_mode.ac97 = EM28XX_NO_AC97;
465 dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
467 vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
469 /* Device likely doesn't support AC97 */
470 em28xx_warn("AC97 chip type couldn't be determined\n");
474 vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
478 dev->audio_mode.ac97_vendor_id1 = vid1;
479 dev->audio_mode.ac97_vendor_id2 = vid2;
480 em28xx_warn("AC97 vendor ID = %04x:%04x\n", vid1, vid2);
482 feat = em28xx_read_ac97(dev, AC97_RESET);
486 dev->audio_mode.ac97_feat = feat;
487 em28xx_warn("AC97 features = 0x%04x\n", feat);
489 if ((vid1 == 0xffff) && (vid2 == 0xffff) && (feat == 0x6a90))
490 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
493 /* Reports detected AC97 processor */
494 switch (dev->audio_mode.ac97) {
496 em28xx_info("No AC97 audio processor\n");
498 case EM28XX_AC97_EM202:
499 em28xx_info("Empia 202 AC97 audio processor detected\n");
501 case EM28XX_AC97_OTHER:
502 em28xx_warn("Unknown AC97 audio processor detected!\n");
508 return em28xx_audio_analog_set(dev);
510 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
512 int em28xx_colorlevels_set_default(struct em28xx *dev)
514 em28xx_write_regs(dev, EM28XX_R20_YGAIN, "\x10", 1); /* contrast */
515 em28xx_write_regs(dev, EM28XX_R21_YOFFSET, "\x00", 1); /* brightness */
516 em28xx_write_regs(dev, EM28XX_R22_UVGAIN, "\x10", 1); /* saturation */
517 em28xx_write_regs(dev, EM28XX_R23_UOFFSET, "\x00", 1);
518 em28xx_write_regs(dev, EM28XX_R24_VOFFSET, "\x00", 1);
519 em28xx_write_regs(dev, EM28XX_R25_SHARPNESS, "\x00", 1);
521 em28xx_write_regs(dev, EM28XX_R14_GAMMA, "\x20", 1);
522 em28xx_write_regs(dev, EM28XX_R15_RGAIN, "\x20", 1);
523 em28xx_write_regs(dev, EM28XX_R16_GGAIN, "\x20", 1);
524 em28xx_write_regs(dev, EM28XX_R17_BGAIN, "\x20", 1);
525 em28xx_write_regs(dev, EM28XX_R18_ROFFSET, "\x00", 1);
526 em28xx_write_regs(dev, EM28XX_R19_GOFFSET, "\x00", 1);
527 return em28xx_write_regs(dev, EM28XX_R1A_BOFFSET, "\x00", 1);
530 int em28xx_capture_start(struct em28xx *dev, int start)
534 if (dev->chip_id == CHIP_ID_EM2874) {
535 /* The Transport Stream Enable Register moved in em2874 */
537 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
539 EM2874_TS1_CAPTURE_ENABLE);
543 /* Enable Transport Stream */
544 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
545 EM2874_TS1_CAPTURE_ENABLE,
546 EM2874_TS1_CAPTURE_ENABLE);
551 /* FIXME: which is the best order? */
552 /* video registers are sampled by VREF */
553 rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
554 start ? 0x10 : 0x00, 0x10);
559 /* disable video capture */
560 rc = em28xx_write_regs(dev, EM28XX_R12_VINENABLE, "\x27", 1);
564 /* enable video capture */
565 rc = em28xx_write_regs_req(dev, 0x00, 0x48, "\x00", 1);
567 if (dev->mode == EM28XX_ANALOG_MODE)
568 rc = em28xx_write_regs(dev, EM28XX_R12_VINENABLE, "\x67", 1);
570 rc = em28xx_write_regs(dev, EM28XX_R12_VINENABLE, "\x37", 1);
577 int em28xx_outfmt_set_yuv422(struct em28xx *dev)
579 em28xx_write_regs(dev, EM28XX_R27_OUTFMT, "\x34", 1);
580 em28xx_write_regs(dev, EM28XX_R10_VINMODE, "\x10", 1);
581 return em28xx_write_regs(dev, EM28XX_R11_VINCTRL, "\x11", 1);
584 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
587 em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
588 xmin, ymin, xmax, ymax);
590 em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
591 em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
592 em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
593 return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
596 static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
597 u16 width, u16 height)
601 u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
603 em28xx_coredbg("em28xx Area Set: (%d,%d)\n",
604 (width | (overflow & 2) << 7),
605 (height | (overflow & 1) << 8));
607 em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
608 em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
609 em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
610 em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
611 return em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
614 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
617 /* the em2800 scaler only supports scaling down to 50% */
619 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
624 em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);
627 em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
628 /* it seems that both H and V scalers must be active
630 mode = (h || v)? 0x30: 0x00;
632 return em28xx_write_reg_bits(dev, EM28XX_R26_COMPR, mode, 0x30);
635 /* FIXME: this only function read values from dev */
636 int em28xx_resolution_set(struct em28xx *dev)
639 width = norm_maxw(dev);
640 height = norm_maxh(dev) >> 1;
642 em28xx_outfmt_set_yuv422(dev);
643 em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
644 em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
645 return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
648 int em28xx_set_alternate(struct em28xx *dev)
650 int errCode, prev_alt = dev->alt;
652 unsigned int min_pkt_size = dev->width * 2 + 4;
654 /* When image size is bigger than a certain value,
655 the frame size should be increased, otherwise, only
656 green screen will be received.
658 if (dev->width * 2 * dev->height > 720 * 240 * 2)
661 for (i = 0; i < dev->num_alt; i++) {
662 /* stop when the selected alt setting offers enough bandwidth */
663 if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
666 /* otherwise make sure that we end up with the maximum bandwidth
667 because the min_pkt_size equation might be wrong...
669 } else if (dev->alt_max_pkt_size[i] >
670 dev->alt_max_pkt_size[dev->alt])
674 if (dev->alt != prev_alt) {
675 em28xx_coredbg("minimum isoc packet size: %u (alt=%d)\n",
676 min_pkt_size, dev->alt);
677 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
678 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n",
679 dev->alt, dev->max_pkt_size);
680 errCode = usb_set_interface(dev->udev, 0, dev->alt);
682 em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
690 int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
697 dev->em28xx_write_regs_req(dev, 0x00, 0x48, "\x00", 1);
698 if (dev->mode == EM28XX_ANALOG_MODE)
699 dev->em28xx_write_regs_req(dev, 0x00, 0x12, "\x67", 1);
701 dev->em28xx_write_regs_req(dev, 0x00, 0x12, "\x37", 1);
704 /* Send GPIO reset sequences specified at board entry */
705 while (gpio->sleep >= 0) {
706 if (gpio->reg >= 0) {
707 rc = em28xx_write_reg_bits(dev,
722 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
724 if (dev->mode == set_mode)
727 if (set_mode == EM28XX_MODE_UNDEFINED) {
728 dev->mode = set_mode;
732 dev->mode = set_mode;
734 if (dev->mode == EM28XX_DIGITAL_MODE)
735 return em28xx_gpio_set(dev, dev->digital_gpio);
737 return em28xx_gpio_set(dev, dev->analog_gpio);
739 EXPORT_SYMBOL_GPL(em28xx_set_mode);
741 /* ------------------------------------------------------------------
743 ------------------------------------------------------------------*/
746 * IRQ callback, called by URB callback
748 static void em28xx_irq_callback(struct urb *urb)
750 struct em28xx_dmaqueue *dma_q = urb->context;
751 struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
754 /* Copy data from URB */
755 spin_lock(&dev->slock);
756 rc = dev->isoc_ctl.isoc_copy(dev, urb);
757 spin_unlock(&dev->slock);
759 /* Reset urb buffers */
760 for (i = 0; i < urb->number_of_packets; i++) {
761 urb->iso_frame_desc[i].status = 0;
762 urb->iso_frame_desc[i].actual_length = 0;
766 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
768 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
774 * Stop and Deallocate URBs
776 void em28xx_uninit_isoc(struct em28xx *dev)
781 em28xx_isocdbg("em28xx: called em28xx_uninit_isoc\n");
783 dev->isoc_ctl.nfields = -1;
784 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
785 urb = dev->isoc_ctl.urb[i];
789 if (dev->isoc_ctl.transfer_buffer[i]) {
790 usb_buffer_free(dev->udev,
791 urb->transfer_buffer_length,
792 dev->isoc_ctl.transfer_buffer[i],
796 dev->isoc_ctl.urb[i] = NULL;
798 dev->isoc_ctl.transfer_buffer[i] = NULL;
801 kfree(dev->isoc_ctl.urb);
802 kfree(dev->isoc_ctl.transfer_buffer);
804 dev->isoc_ctl.urb = NULL;
805 dev->isoc_ctl.transfer_buffer = NULL;
806 dev->isoc_ctl.num_bufs = 0;
808 em28xx_capture_start(dev, 0);
810 EXPORT_SYMBOL_GPL(em28xx_uninit_isoc);
813 * Allocate URBs and start IRQ
815 int em28xx_init_isoc(struct em28xx *dev, int max_packets,
816 int num_bufs, int max_pkt_size,
817 int (*isoc_copy) (struct em28xx *dev, struct urb *urb))
819 struct em28xx_dmaqueue *dma_q = &dev->vidq;
826 em28xx_isocdbg("em28xx: called em28xx_prepare_isoc\n");
828 /* De-allocates all pending stuff */
829 em28xx_uninit_isoc(dev);
831 dev->isoc_ctl.isoc_copy = isoc_copy;
832 dev->isoc_ctl.num_bufs = num_bufs;
834 dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs, GFP_KERNEL);
835 if (!dev->isoc_ctl.urb) {
836 em28xx_errdev("cannot alloc memory for usb buffers\n");
840 dev->isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
842 if (!dev->isoc_ctl.transfer_buffer) {
843 em28xx_errdev("cannot allocate memory for usbtransfer\n");
844 kfree(dev->isoc_ctl.urb);
848 dev->isoc_ctl.max_pkt_size = max_pkt_size;
849 dev->isoc_ctl.buf = NULL;
851 sb_size = max_packets * dev->isoc_ctl.max_pkt_size;
853 /* allocate urbs and transfer buffers */
854 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
855 urb = usb_alloc_urb(max_packets, GFP_KERNEL);
857 em28xx_err("cannot alloc isoc_ctl.urb %i\n", i);
858 em28xx_uninit_isoc(dev);
861 dev->isoc_ctl.urb[i] = urb;
863 dev->isoc_ctl.transfer_buffer[i] = usb_buffer_alloc(dev->udev,
864 sb_size, GFP_KERNEL, &urb->transfer_dma);
865 if (!dev->isoc_ctl.transfer_buffer[i]) {
866 em28xx_err("unable to allocate %i bytes for transfer"
869 in_interrupt()?" while in int":"");
870 em28xx_uninit_isoc(dev);
873 memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size);
875 /* FIXME: this is a hack - should be
876 'desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK'
877 should also be using 'desc.bInterval'
879 pipe = usb_rcvisocpipe(dev->udev,
880 dev->mode == EM28XX_ANALOG_MODE ? 0x82 : 0x84);
882 usb_fill_int_urb(urb, dev->udev, pipe,
883 dev->isoc_ctl.transfer_buffer[i], sb_size,
884 em28xx_irq_callback, dma_q, 1);
886 urb->number_of_packets = max_packets;
887 urb->transfer_flags = URB_ISO_ASAP;
890 for (j = 0; j < max_packets; j++) {
891 urb->iso_frame_desc[j].offset = k;
892 urb->iso_frame_desc[j].length =
893 dev->isoc_ctl.max_pkt_size;
894 k += dev->isoc_ctl.max_pkt_size;
898 init_waitqueue_head(&dma_q->wq);
900 em28xx_capture_start(dev, 1);
902 /* submit urbs and enables IRQ */
903 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
904 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_ATOMIC);
906 em28xx_err("submit of urb %i failed (error=%i)\n", i,
908 em28xx_uninit_isoc(dev);
915 EXPORT_SYMBOL_GPL(em28xx_init_isoc);