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>
29 #include <media/v4l2-common.h>
33 /* #define ENABLE_DEBUG_ISOC_FRAMES */
35 static unsigned int core_debug;
36 module_param(core_debug,int,0644);
37 MODULE_PARM_DESC(core_debug,"enable debug messages [core]");
39 #define em28xx_coredbg(fmt, arg...) do {\
41 printk(KERN_INFO "%s %s :"fmt, \
42 dev->name, __func__ , ##arg); } while (0)
44 static unsigned int reg_debug;
45 module_param(reg_debug,int,0644);
46 MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");
48 #define em28xx_regdbg(fmt, arg...) do {\
50 printk(KERN_INFO "%s %s :"fmt, \
51 dev->name, __func__ , ##arg); } while (0)
53 static int alt = EM28XX_PINOUT;
54 module_param(alt, int, 0644);
55 MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
58 #define em28xx_isocdbg(fmt, arg...) do {\
60 printk(KERN_INFO "%s %s :"fmt, \
61 dev->name, __func__ , ##arg); } while (0)
64 * em28xx_read_reg_req()
65 * reads data from the usb device specifying bRequest
67 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
71 int pipe = usb_rcvctrlpipe(dev->udev, 0);
73 if (dev->state & DEV_DISCONNECTED)
76 if (len > URB_MAX_CTRL_SIZE)
80 printk( KERN_DEBUG "(pipe 0x%08x): "
81 "IN: %02x %02x %02x %02x %02x %02x %02x %02x ",
83 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
86 len & 0xff, len >> 8);
89 mutex_lock(&dev->ctrl_urb_lock);
90 ret = usb_control_msg(dev->udev, pipe, req,
91 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
92 0x0000, reg, dev->urb_buf, len, HZ);
96 mutex_unlock(&dev->ctrl_urb_lock);
101 memcpy(buf, dev->urb_buf, len);
103 mutex_unlock(&dev->ctrl_urb_lock);
109 for (byte = 0; byte < len; byte++)
110 printk(" %02x", (unsigned char)buf[byte]);
118 * em28xx_read_reg_req()
119 * reads data from the usb device specifying bRequest
121 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
126 ret = em28xx_read_reg_req_len(dev, req, reg, &val, 1);
133 int em28xx_read_reg(struct em28xx *dev, u16 reg)
135 return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
139 * em28xx_write_regs_req()
140 * sends data to the usb device, specifying bRequest
142 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
146 int pipe = usb_sndctrlpipe(dev->udev, 0);
148 if (dev->state & DEV_DISCONNECTED)
151 if ((len < 1) || (len > URB_MAX_CTRL_SIZE))
157 printk( KERN_DEBUG "(pipe 0x%08x): "
158 "OUT: %02x %02x %02x %02x %02x %02x %02x %02x >>>",
160 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
162 reg & 0xff, reg >> 8,
163 len & 0xff, len >> 8);
165 for (byte = 0; byte < len; byte++)
166 printk(" %02x", (unsigned char)buf[byte]);
170 mutex_lock(&dev->ctrl_urb_lock);
171 memcpy(dev->urb_buf, buf, len);
172 ret = usb_control_msg(dev->udev, pipe, req,
173 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
174 0x0000, reg, dev->urb_buf, len, HZ);
175 mutex_unlock(&dev->ctrl_urb_lock);
177 if (dev->wait_after_write)
178 msleep(dev->wait_after_write);
183 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
187 rc = em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
189 /* Stores GPO/GPIO values at the cache, if changed
190 Only write values should be stored, since input on a GPIO
191 register will return the input bits.
192 Not sure what happens on reading GPO register.
195 if (reg == dev->reg_gpo_num)
196 dev->reg_gpo = buf[0];
197 else if (reg == dev->reg_gpio_num)
198 dev->reg_gpio = buf[0];
204 /* Write a single register */
205 int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
207 return em28xx_write_regs(dev, reg, &val, 1);
211 * em28xx_write_reg_bits()
212 * sets only some bits (specified by bitmask) of a register, by first reading
215 static int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
221 /* Uses cache for gpo/gpio registers */
222 if (reg == dev->reg_gpo_num)
223 oldval = dev->reg_gpo;
224 else if (reg == dev->reg_gpio_num)
225 oldval = dev->reg_gpio;
227 oldval = em28xx_read_reg(dev, reg);
232 newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
234 return em28xx_write_regs(dev, reg, &newval, 1);
238 * em28xx_is_ac97_ready()
239 * Checks if ac97 is ready
241 static int em28xx_is_ac97_ready(struct em28xx *dev)
245 /* Wait up to 50 ms for AC97 command to complete */
246 for (i = 0; i < 10; i++, msleep(5)) {
247 ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
255 em28xx_warn("AC97 command still being executed: not handled properly!\n");
261 * write a 16 bit value to the specified AC97 address (LSB first!)
263 int em28xx_read_ac97(struct em28xx *dev, u8 reg)
266 u8 addr = (reg & 0x7f) | 0x80;
269 ret = em28xx_is_ac97_ready(dev);
273 ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
277 ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
278 (u8 *)&val, sizeof(val));
282 return le16_to_cpu(val);
286 * em28xx_write_ac97()
287 * write a 16 bit value to the specified AC97 address (LSB first!)
289 int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
292 u8 addr = reg & 0x7f;
295 value = cpu_to_le16(val);
297 ret = em28xx_is_ac97_ready(dev);
301 ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *) &value, 2);
305 ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
312 struct em28xx_vol_table {
313 enum em28xx_amux mux;
317 static struct em28xx_vol_table inputs[] = {
318 { EM28XX_AMUX_VIDEO, AC97_VIDEO_VOL },
319 { EM28XX_AMUX_LINE_IN, AC97_LINEIN_VOL },
320 { EM28XX_AMUX_PHONE, AC97_PHONE_VOL },
321 { EM28XX_AMUX_MIC, AC97_MIC_VOL },
322 { EM28XX_AMUX_CD, AC97_CD_VOL },
323 { EM28XX_AMUX_AUX, AC97_AUX_VOL },
324 { EM28XX_AMUX_PCM_OUT, AC97_PCM_OUT_VOL },
327 static int set_ac97_input(struct em28xx *dev)
330 enum em28xx_amux amux = dev->ctl_ainput;
332 /* EM28XX_AMUX_VIDEO2 is a special case used to indicate that
333 em28xx should point to LINE IN, while AC97 should use VIDEO
335 if (amux == EM28XX_AMUX_VIDEO2)
336 amux = EM28XX_AMUX_VIDEO;
338 /* Mute all entres but the one that were selected */
339 for (i = 0; i < ARRAY_SIZE(inputs); i++) {
340 if (amux == inputs[i].mux)
341 ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
343 ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
346 em28xx_warn("couldn't setup AC97 register %d\n",
352 static int em28xx_set_audio_source(struct em28xx *dev)
357 if (dev->board.is_em2800) {
358 if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
359 input = EM2800_AUDIO_SRC_TUNER;
361 input = EM2800_AUDIO_SRC_LINE;
363 ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
368 if (dev->board.has_msp34xx)
369 input = EM28XX_AUDIO_SRC_TUNER;
371 switch (dev->ctl_ainput) {
372 case EM28XX_AMUX_VIDEO:
373 input = EM28XX_AUDIO_SRC_TUNER;
376 input = EM28XX_AUDIO_SRC_LINE;
381 ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
386 switch (dev->audio_mode.ac97) {
390 ret = set_ac97_input(dev);
396 struct em28xx_vol_table outputs[] = {
397 { EM28XX_AOUT_MASTER, AC97_MASTER_VOL },
398 { EM28XX_AOUT_LINE, AC97_LINE_LEVEL_VOL },
399 { EM28XX_AOUT_MONO, AC97_MASTER_MONO_VOL },
400 { EM28XX_AOUT_LFE, AC97_LFE_MASTER_VOL },
401 { EM28XX_AOUT_SURR, AC97_SURR_MASTER_VOL },
404 int em28xx_audio_analog_set(struct em28xx *dev)
409 if (!dev->audio_mode.has_audio)
412 /* It is assumed that all devices use master volume for output.
413 It would be possible to use also line output.
415 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
416 /* Mute all outputs */
417 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
418 ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
420 em28xx_warn("couldn't setup AC97 register %d\n",
425 xclk = dev->board.xclk & 0x7f;
429 ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
434 /* Selects the proper audio input */
435 ret = em28xx_set_audio_source(dev);
438 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
441 /* LSB: left channel - both channels with the same level */
442 vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
444 /* Mute device, if needed */
449 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
450 if (dev->ctl_aoutput & outputs[i].mux)
451 ret = em28xx_write_ac97(dev, outputs[i].reg,
454 em28xx_warn("couldn't setup AC97 register %d\n",
461 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
463 int em28xx_audio_setup(struct em28xx *dev)
465 int vid1, vid2, feat, cfg;
468 if (dev->chip_id == CHIP_ID_EM2870 || dev->chip_id == CHIP_ID_EM2874) {
469 /* Digital only device - don't load any alsa module */
470 dev->audio_mode.has_audio = 0;
471 dev->has_audio_class = 0;
472 dev->has_alsa_audio = 0;
476 /* If device doesn't support Usb Audio Class, use vendor class */
477 if (!dev->has_audio_class)
478 dev->has_alsa_audio = 1;
480 dev->audio_mode.has_audio = 1;
482 /* See how this device is configured */
483 cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
485 cfg = EM28XX_CHIPCFG_AC97; /* Be conservative */
487 em28xx_info("Config register raw data: 0x%02x\n", cfg);
489 if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
490 EM28XX_CHIPCFG_I2S_3_SAMPRATES) {
491 em28xx_info("I2S Audio (3 sample rates)\n");
492 dev->audio_mode.i2s_3rates = 1;
494 if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
495 EM28XX_CHIPCFG_I2S_5_SAMPRATES) {
496 em28xx_info("I2S Audio (5 sample rates)\n");
497 dev->audio_mode.i2s_5rates = 1;
500 if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
501 /* Skip the code that does AC97 vendor detection */
502 dev->audio_mode.ac97 = EM28XX_NO_AC97;
506 dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
508 vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
510 /* Device likely doesn't support AC97 */
511 em28xx_warn("AC97 chip type couldn't be determined\n");
515 vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
519 vid = vid1 << 16 | vid2;
521 dev->audio_mode.ac97_vendor_id = vid;
522 em28xx_warn("AC97 vendor ID = 0x%08x\n", vid);
524 feat = em28xx_read_ac97(dev, AC97_RESET);
528 dev->audio_mode.ac97_feat = feat;
529 em28xx_warn("AC97 features = 0x%04x\n", feat);
531 /* Try to identify what audio processor we have */
532 if ((vid == 0xffffffff) && (feat == 0x6a90))
533 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
534 else if ((vid >> 8) == 0x838476)
535 dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
538 /* Reports detected AC97 processor */
539 switch (dev->audio_mode.ac97) {
541 em28xx_info("No AC97 audio processor\n");
543 case EM28XX_AC97_EM202:
544 em28xx_info("Empia 202 AC97 audio processor detected\n");
546 case EM28XX_AC97_SIGMATEL:
547 em28xx_info("Sigmatel audio processor detected(stac 97%02x)\n",
548 dev->audio_mode.ac97_vendor_id & 0xff);
550 case EM28XX_AC97_OTHER:
551 em28xx_warn("Unknown AC97 audio processor detected!\n");
557 return em28xx_audio_analog_set(dev);
559 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
561 int em28xx_colorlevels_set_default(struct em28xx *dev)
563 em28xx_write_reg(dev, EM28XX_R20_YGAIN, 0x10); /* contrast */
564 em28xx_write_reg(dev, EM28XX_R21_YOFFSET, 0x00); /* brightness */
565 em28xx_write_reg(dev, EM28XX_R22_UVGAIN, 0x10); /* saturation */
566 em28xx_write_reg(dev, EM28XX_R23_UOFFSET, 0x00);
567 em28xx_write_reg(dev, EM28XX_R24_VOFFSET, 0x00);
568 em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, 0x00);
570 em28xx_write_reg(dev, EM28XX_R14_GAMMA, 0x20);
571 em28xx_write_reg(dev, EM28XX_R15_RGAIN, 0x20);
572 em28xx_write_reg(dev, EM28XX_R16_GGAIN, 0x20);
573 em28xx_write_reg(dev, EM28XX_R17_BGAIN, 0x20);
574 em28xx_write_reg(dev, EM28XX_R18_ROFFSET, 0x00);
575 em28xx_write_reg(dev, EM28XX_R19_GOFFSET, 0x00);
576 return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
579 int em28xx_capture_start(struct em28xx *dev, int start)
583 if (dev->chip_id == CHIP_ID_EM2874) {
584 /* The Transport Stream Enable Register moved in em2874 */
586 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
588 EM2874_TS1_CAPTURE_ENABLE);
592 /* Enable Transport Stream */
593 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
594 EM2874_TS1_CAPTURE_ENABLE,
595 EM2874_TS1_CAPTURE_ENABLE);
600 /* FIXME: which is the best order? */
601 /* video registers are sampled by VREF */
602 rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
603 start ? 0x10 : 0x00, 0x10);
608 /* disable video capture */
609 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
613 /* enable video capture */
614 rc = em28xx_write_reg(dev, 0x48, 0x00);
616 if (dev->mode == EM28XX_ANALOG_MODE)
617 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
619 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
626 int em28xx_set_outfmt(struct em28xx *dev)
630 ret = em28xx_write_reg_bits(dev, EM28XX_R27_OUTFMT,
631 dev->format->reg | 0x20, 0x3f);
635 ret = em28xx_write_reg(dev, EM28XX_R10_VINMODE, 0x10);
639 return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, 0x11);
642 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
645 em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
646 xmin, ymin, xmax, ymax);
648 em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
649 em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
650 em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
651 return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
654 static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
655 u16 width, u16 height)
659 u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
661 em28xx_coredbg("em28xx Area Set: (%d,%d)\n",
662 (width | (overflow & 2) << 7),
663 (height | (overflow & 1) << 8));
665 em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
666 em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
667 em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
668 em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
669 return em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
672 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
675 /* the em2800 scaler only supports scaling down to 50% */
676 if (dev->board.is_em2800)
677 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
682 em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);
685 em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
686 /* it seems that both H and V scalers must be active
688 mode = (h || v)? 0x30: 0x00;
690 return em28xx_write_reg_bits(dev, EM28XX_R26_COMPR, mode, 0x30);
693 /* FIXME: this only function read values from dev */
694 int em28xx_resolution_set(struct em28xx *dev)
697 width = norm_maxw(dev);
698 height = norm_maxh(dev) >> 1;
700 em28xx_set_outfmt(dev);
701 em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
702 em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
703 return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
706 int em28xx_set_alternate(struct em28xx *dev)
708 int errCode, prev_alt = dev->alt;
710 unsigned int min_pkt_size = dev->width * 2 + 4;
712 /* When image size is bigger than a certain value,
713 the frame size should be increased, otherwise, only
714 green screen will be received.
716 if (dev->width * 2 * dev->height > 720 * 240 * 2)
719 for (i = 0; i < dev->num_alt; i++) {
720 /* stop when the selected alt setting offers enough bandwidth */
721 if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
724 /* otherwise make sure that we end up with the maximum bandwidth
725 because the min_pkt_size equation might be wrong...
727 } else if (dev->alt_max_pkt_size[i] >
728 dev->alt_max_pkt_size[dev->alt])
732 if (dev->alt != prev_alt) {
733 em28xx_coredbg("minimum isoc packet size: %u (alt=%d)\n",
734 min_pkt_size, dev->alt);
735 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
736 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n",
737 dev->alt, dev->max_pkt_size);
738 errCode = usb_set_interface(dev->udev, 0, dev->alt);
740 em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
748 int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
755 if (dev->mode != EM28XX_SUSPEND) {
756 em28xx_write_reg(dev, 0x48, 0x00);
757 if (dev->mode == EM28XX_ANALOG_MODE)
758 em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
760 em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
764 /* Send GPIO reset sequences specified at board entry */
765 while (gpio->sleep >= 0) {
766 if (gpio->reg >= 0) {
767 rc = em28xx_write_reg_bits(dev,
782 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
784 if (dev->mode == set_mode)
787 if (set_mode == EM28XX_SUSPEND) {
788 dev->mode = set_mode;
790 /* FIXME: add suspend support for ac97 */
792 return em28xx_gpio_set(dev, dev->board.suspend_gpio);
795 dev->mode = set_mode;
797 if (dev->mode == EM28XX_DIGITAL_MODE)
798 return em28xx_gpio_set(dev, dev->board.dvb_gpio);
800 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
802 EXPORT_SYMBOL_GPL(em28xx_set_mode);
804 /* ------------------------------------------------------------------
806 ------------------------------------------------------------------*/
809 * IRQ callback, called by URB callback
811 static void em28xx_irq_callback(struct urb *urb)
813 struct em28xx_dmaqueue *dma_q = urb->context;
814 struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
817 /* Copy data from URB */
818 spin_lock(&dev->slock);
819 rc = dev->isoc_ctl.isoc_copy(dev, urb);
820 spin_unlock(&dev->slock);
822 /* Reset urb buffers */
823 for (i = 0; i < urb->number_of_packets; i++) {
824 urb->iso_frame_desc[i].status = 0;
825 urb->iso_frame_desc[i].actual_length = 0;
829 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
831 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
837 * Stop and Deallocate URBs
839 void em28xx_uninit_isoc(struct em28xx *dev)
844 em28xx_isocdbg("em28xx: called em28xx_uninit_isoc\n");
846 dev->isoc_ctl.nfields = -1;
847 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
848 urb = dev->isoc_ctl.urb[i];
852 if (dev->isoc_ctl.transfer_buffer[i]) {
853 usb_buffer_free(dev->udev,
854 urb->transfer_buffer_length,
855 dev->isoc_ctl.transfer_buffer[i],
859 dev->isoc_ctl.urb[i] = NULL;
861 dev->isoc_ctl.transfer_buffer[i] = NULL;
864 kfree(dev->isoc_ctl.urb);
865 kfree(dev->isoc_ctl.transfer_buffer);
867 dev->isoc_ctl.urb = NULL;
868 dev->isoc_ctl.transfer_buffer = NULL;
869 dev->isoc_ctl.num_bufs = 0;
871 em28xx_capture_start(dev, 0);
873 EXPORT_SYMBOL_GPL(em28xx_uninit_isoc);
876 * Allocate URBs and start IRQ
878 int em28xx_init_isoc(struct em28xx *dev, int max_packets,
879 int num_bufs, int max_pkt_size,
880 int (*isoc_copy) (struct em28xx *dev, struct urb *urb))
882 struct em28xx_dmaqueue *dma_q = &dev->vidq;
889 em28xx_isocdbg("em28xx: called em28xx_prepare_isoc\n");
891 /* De-allocates all pending stuff */
892 em28xx_uninit_isoc(dev);
894 dev->isoc_ctl.isoc_copy = isoc_copy;
895 dev->isoc_ctl.num_bufs = num_bufs;
897 dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs, GFP_KERNEL);
898 if (!dev->isoc_ctl.urb) {
899 em28xx_errdev("cannot alloc memory for usb buffers\n");
903 dev->isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
905 if (!dev->isoc_ctl.transfer_buffer) {
906 em28xx_errdev("cannot allocate memory for usbtransfer\n");
907 kfree(dev->isoc_ctl.urb);
911 dev->isoc_ctl.max_pkt_size = max_pkt_size;
912 dev->isoc_ctl.buf = NULL;
914 sb_size = max_packets * dev->isoc_ctl.max_pkt_size;
916 /* allocate urbs and transfer buffers */
917 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
918 urb = usb_alloc_urb(max_packets, GFP_KERNEL);
920 em28xx_err("cannot alloc isoc_ctl.urb %i\n", i);
921 em28xx_uninit_isoc(dev);
924 dev->isoc_ctl.urb[i] = urb;
926 dev->isoc_ctl.transfer_buffer[i] = usb_buffer_alloc(dev->udev,
927 sb_size, GFP_KERNEL, &urb->transfer_dma);
928 if (!dev->isoc_ctl.transfer_buffer[i]) {
929 em28xx_err("unable to allocate %i bytes for transfer"
932 in_interrupt()?" while in int":"");
933 em28xx_uninit_isoc(dev);
936 memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size);
938 /* FIXME: this is a hack - should be
939 'desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK'
940 should also be using 'desc.bInterval'
942 pipe = usb_rcvisocpipe(dev->udev,
943 dev->mode == EM28XX_ANALOG_MODE ? 0x82 : 0x84);
945 usb_fill_int_urb(urb, dev->udev, pipe,
946 dev->isoc_ctl.transfer_buffer[i], sb_size,
947 em28xx_irq_callback, dma_q, 1);
949 urb->number_of_packets = max_packets;
950 urb->transfer_flags = URB_ISO_ASAP;
953 for (j = 0; j < max_packets; j++) {
954 urb->iso_frame_desc[j].offset = k;
955 urb->iso_frame_desc[j].length =
956 dev->isoc_ctl.max_pkt_size;
957 k += dev->isoc_ctl.max_pkt_size;
961 init_waitqueue_head(&dma_q->wq);
963 em28xx_capture_start(dev, 1);
965 /* submit urbs and enables IRQ */
966 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
967 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_ATOMIC);
969 em28xx_err("submit of urb %i failed (error=%i)\n", i,
971 em28xx_uninit_isoc(dev);
978 EXPORT_SYMBOL_GPL(em28xx_init_isoc);
982 * configure i2c attached devices
984 void em28xx_wake_i2c(struct em28xx *dev)
986 struct v4l2_routing route;
989 route.input = INPUT(dev->ctl_input)->vmux;
991 em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, &zero);
992 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
993 em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
997 * Device control list
1000 static LIST_HEAD(em28xx_devlist);
1001 static DEFINE_MUTEX(em28xx_devlist_mutex);
1003 struct em28xx *em28xx_get_device(struct inode *inode,
1004 enum v4l2_buf_type *fh_type,
1007 struct em28xx *h, *dev = NULL;
1008 int minor = iminor(inode);
1010 *fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1013 mutex_lock(&em28xx_devlist_mutex);
1014 list_for_each_entry(h, &em28xx_devlist, devlist) {
1015 if (h->vdev->minor == minor)
1017 if (h->vbi_dev->minor == minor) {
1019 *fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
1022 h->radio_dev->minor == minor) {
1027 mutex_unlock(&em28xx_devlist_mutex);
1033 * em28xx_realease_resources()
1034 * unregisters the v4l2,i2c and usb devices
1035 * called when the device gets disconected or at module unload
1037 void em28xx_remove_from_devlist(struct em28xx *dev)
1039 mutex_lock(&em28xx_devlist_mutex);
1040 list_del(&dev->devlist);
1041 mutex_unlock(&em28xx_devlist_mutex);
1044 void em28xx_add_into_devlist(struct em28xx *dev)
1046 mutex_lock(&em28xx_devlist_mutex);
1047 list_add_tail(&dev->devlist, &em28xx_devlist);
1048 mutex_unlock(&em28xx_devlist_mutex);
1052 * Extension interface
1055 static LIST_HEAD(em28xx_extension_devlist);
1056 static DEFINE_MUTEX(em28xx_extension_devlist_lock);
1058 int em28xx_register_extension(struct em28xx_ops *ops)
1060 struct em28xx *dev = NULL;
1062 mutex_lock(&em28xx_devlist_mutex);
1063 mutex_lock(&em28xx_extension_devlist_lock);
1064 list_add_tail(&ops->next, &em28xx_extension_devlist);
1065 list_for_each_entry(dev, &em28xx_devlist, devlist) {
1069 printk(KERN_INFO "Em28xx: Initialized (%s) extension\n", ops->name);
1070 mutex_unlock(&em28xx_extension_devlist_lock);
1071 mutex_unlock(&em28xx_devlist_mutex);
1074 EXPORT_SYMBOL(em28xx_register_extension);
1076 void em28xx_unregister_extension(struct em28xx_ops *ops)
1078 struct em28xx *dev = NULL;
1080 mutex_lock(&em28xx_devlist_mutex);
1081 list_for_each_entry(dev, &em28xx_devlist, devlist) {
1086 mutex_lock(&em28xx_extension_devlist_lock);
1087 printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
1088 list_del(&ops->next);
1089 mutex_unlock(&em28xx_extension_devlist_lock);
1090 mutex_unlock(&em28xx_devlist_mutex);
1092 EXPORT_SYMBOL(em28xx_unregister_extension);
1094 void em28xx_init_extension(struct em28xx *dev)
1096 struct em28xx_ops *ops = NULL;
1098 mutex_lock(&em28xx_extension_devlist_lock);
1099 if (!list_empty(&em28xx_extension_devlist)) {
1100 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1105 mutex_unlock(&em28xx_extension_devlist_lock);
1108 void em28xx_close_extension(struct em28xx *dev)
1110 struct em28xx_ops *ops = NULL;
1112 mutex_lock(&em28xx_extension_devlist_lock);
1113 if (!list_empty(&em28xx_extension_devlist)) {
1114 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1119 mutex_unlock(&em28xx_extension_devlist_lock);