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 static const 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",
458 if (dev->ctl_aoutput & EM28XX_AOUT_PCM_IN) {
459 int sel = ac97_return_record_select(dev->ctl_aoutput);
461 /* Use the same input for both left and right channels */
464 em28xx_write_ac97(dev, AC97_RECORD_SELECT, sel);
470 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
472 int em28xx_audio_setup(struct em28xx *dev)
474 int vid1, vid2, feat, cfg;
477 if (dev->chip_id == CHIP_ID_EM2870 || dev->chip_id == CHIP_ID_EM2874) {
478 /* Digital only device - don't load any alsa module */
479 dev->audio_mode.has_audio = 0;
480 dev->has_audio_class = 0;
481 dev->has_alsa_audio = 0;
485 /* If device doesn't support Usb Audio Class, use vendor class */
486 if (!dev->has_audio_class)
487 dev->has_alsa_audio = 1;
489 dev->audio_mode.has_audio = 1;
491 /* See how this device is configured */
492 cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
494 cfg = EM28XX_CHIPCFG_AC97; /* Be conservative */
496 em28xx_info("Config register raw data: 0x%02x\n", cfg);
498 if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
499 EM28XX_CHIPCFG_I2S_3_SAMPRATES) {
500 em28xx_info("I2S Audio (3 sample rates)\n");
501 dev->audio_mode.i2s_3rates = 1;
503 if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
504 EM28XX_CHIPCFG_I2S_5_SAMPRATES) {
505 em28xx_info("I2S Audio (5 sample rates)\n");
506 dev->audio_mode.i2s_5rates = 1;
509 if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
510 /* Skip the code that does AC97 vendor detection */
511 dev->audio_mode.ac97 = EM28XX_NO_AC97;
515 dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
517 vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
519 /* Device likely doesn't support AC97 */
520 em28xx_warn("AC97 chip type couldn't be determined\n");
524 vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
528 vid = vid1 << 16 | vid2;
530 dev->audio_mode.ac97_vendor_id = vid;
531 em28xx_warn("AC97 vendor ID = 0x%08x\n", vid);
533 feat = em28xx_read_ac97(dev, AC97_RESET);
537 dev->audio_mode.ac97_feat = feat;
538 em28xx_warn("AC97 features = 0x%04x\n", feat);
540 /* Try to identify what audio processor we have */
541 if ((vid == 0xffffffff) && (feat == 0x6a90))
542 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
543 else if ((vid >> 8) == 0x838476)
544 dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
547 /* Reports detected AC97 processor */
548 switch (dev->audio_mode.ac97) {
550 em28xx_info("No AC97 audio processor\n");
552 case EM28XX_AC97_EM202:
553 em28xx_info("Empia 202 AC97 audio processor detected\n");
555 case EM28XX_AC97_SIGMATEL:
556 em28xx_info("Sigmatel audio processor detected(stac 97%02x)\n",
557 dev->audio_mode.ac97_vendor_id & 0xff);
559 case EM28XX_AC97_OTHER:
560 em28xx_warn("Unknown AC97 audio processor detected!\n");
566 return em28xx_audio_analog_set(dev);
568 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
570 int em28xx_colorlevels_set_default(struct em28xx *dev)
572 em28xx_write_reg(dev, EM28XX_R20_YGAIN, 0x10); /* contrast */
573 em28xx_write_reg(dev, EM28XX_R21_YOFFSET, 0x00); /* brightness */
574 em28xx_write_reg(dev, EM28XX_R22_UVGAIN, 0x10); /* saturation */
575 em28xx_write_reg(dev, EM28XX_R23_UOFFSET, 0x00);
576 em28xx_write_reg(dev, EM28XX_R24_VOFFSET, 0x00);
577 em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, 0x00);
579 em28xx_write_reg(dev, EM28XX_R14_GAMMA, 0x20);
580 em28xx_write_reg(dev, EM28XX_R15_RGAIN, 0x20);
581 em28xx_write_reg(dev, EM28XX_R16_GGAIN, 0x20);
582 em28xx_write_reg(dev, EM28XX_R17_BGAIN, 0x20);
583 em28xx_write_reg(dev, EM28XX_R18_ROFFSET, 0x00);
584 em28xx_write_reg(dev, EM28XX_R19_GOFFSET, 0x00);
585 return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
588 int em28xx_capture_start(struct em28xx *dev, int start)
592 if (dev->chip_id == CHIP_ID_EM2874) {
593 /* The Transport Stream Enable Register moved in em2874 */
595 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
597 EM2874_TS1_CAPTURE_ENABLE);
601 /* Enable Transport Stream */
602 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
603 EM2874_TS1_CAPTURE_ENABLE,
604 EM2874_TS1_CAPTURE_ENABLE);
609 /* FIXME: which is the best order? */
610 /* video registers are sampled by VREF */
611 rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
612 start ? 0x10 : 0x00, 0x10);
617 /* disable video capture */
618 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
622 /* enable video capture */
623 rc = em28xx_write_reg(dev, 0x48, 0x00);
625 if (dev->mode == EM28XX_ANALOG_MODE)
626 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
628 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
635 int em28xx_set_outfmt(struct em28xx *dev)
639 ret = em28xx_write_reg_bits(dev, EM28XX_R27_OUTFMT,
640 dev->format->reg | 0x20, 0x3f);
644 ret = em28xx_write_reg(dev, EM28XX_R10_VINMODE, 0x10);
648 return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, 0x11);
651 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
654 em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
655 xmin, ymin, xmax, ymax);
657 em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
658 em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
659 em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
660 return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
663 static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
664 u16 width, u16 height)
668 u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
670 em28xx_coredbg("em28xx Area Set: (%d,%d)\n",
671 (width | (overflow & 2) << 7),
672 (height | (overflow & 1) << 8));
674 em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
675 em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
676 em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
677 em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
678 return em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
681 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
684 /* the em2800 scaler only supports scaling down to 50% */
685 if (dev->board.is_em2800)
686 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
691 em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);
694 em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
695 /* it seems that both H and V scalers must be active
697 mode = (h || v)? 0x30: 0x00;
699 return em28xx_write_reg_bits(dev, EM28XX_R26_COMPR, mode, 0x30);
702 /* FIXME: this only function read values from dev */
703 int em28xx_resolution_set(struct em28xx *dev)
706 width = norm_maxw(dev);
707 height = norm_maxh(dev) >> 1;
709 em28xx_set_outfmt(dev);
710 em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
711 em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
712 return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
715 int em28xx_set_alternate(struct em28xx *dev)
717 int errCode, prev_alt = dev->alt;
719 unsigned int min_pkt_size = dev->width * 2 + 4;
721 /* When image size is bigger than a certain value,
722 the frame size should be increased, otherwise, only
723 green screen will be received.
725 if (dev->width * 2 * dev->height > 720 * 240 * 2)
728 for (i = 0; i < dev->num_alt; i++) {
729 /* stop when the selected alt setting offers enough bandwidth */
730 if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
733 /* otherwise make sure that we end up with the maximum bandwidth
734 because the min_pkt_size equation might be wrong...
736 } else if (dev->alt_max_pkt_size[i] >
737 dev->alt_max_pkt_size[dev->alt])
741 if (dev->alt != prev_alt) {
742 em28xx_coredbg("minimum isoc packet size: %u (alt=%d)\n",
743 min_pkt_size, dev->alt);
744 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
745 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n",
746 dev->alt, dev->max_pkt_size);
747 errCode = usb_set_interface(dev->udev, 0, dev->alt);
749 em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
757 int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
764 if (dev->mode != EM28XX_SUSPEND) {
765 em28xx_write_reg(dev, 0x48, 0x00);
766 if (dev->mode == EM28XX_ANALOG_MODE)
767 em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
769 em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
773 /* Send GPIO reset sequences specified at board entry */
774 while (gpio->sleep >= 0) {
775 if (gpio->reg >= 0) {
776 rc = em28xx_write_reg_bits(dev,
791 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
793 if (dev->mode == set_mode)
796 if (set_mode == EM28XX_SUSPEND) {
797 dev->mode = set_mode;
799 /* FIXME: add suspend support for ac97 */
801 return em28xx_gpio_set(dev, dev->board.suspend_gpio);
804 dev->mode = set_mode;
806 if (dev->mode == EM28XX_DIGITAL_MODE)
807 return em28xx_gpio_set(dev, dev->board.dvb_gpio);
809 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
811 EXPORT_SYMBOL_GPL(em28xx_set_mode);
813 /* ------------------------------------------------------------------
815 ------------------------------------------------------------------*/
818 * IRQ callback, called by URB callback
820 static void em28xx_irq_callback(struct urb *urb)
822 struct em28xx_dmaqueue *dma_q = urb->context;
823 struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
826 /* Copy data from URB */
827 spin_lock(&dev->slock);
828 rc = dev->isoc_ctl.isoc_copy(dev, urb);
829 spin_unlock(&dev->slock);
831 /* Reset urb buffers */
832 for (i = 0; i < urb->number_of_packets; i++) {
833 urb->iso_frame_desc[i].status = 0;
834 urb->iso_frame_desc[i].actual_length = 0;
838 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
840 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
846 * Stop and Deallocate URBs
848 void em28xx_uninit_isoc(struct em28xx *dev)
853 em28xx_isocdbg("em28xx: called em28xx_uninit_isoc\n");
855 dev->isoc_ctl.nfields = -1;
856 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
857 urb = dev->isoc_ctl.urb[i];
861 if (dev->isoc_ctl.transfer_buffer[i]) {
862 usb_buffer_free(dev->udev,
863 urb->transfer_buffer_length,
864 dev->isoc_ctl.transfer_buffer[i],
868 dev->isoc_ctl.urb[i] = NULL;
870 dev->isoc_ctl.transfer_buffer[i] = NULL;
873 kfree(dev->isoc_ctl.urb);
874 kfree(dev->isoc_ctl.transfer_buffer);
876 dev->isoc_ctl.urb = NULL;
877 dev->isoc_ctl.transfer_buffer = NULL;
878 dev->isoc_ctl.num_bufs = 0;
880 em28xx_capture_start(dev, 0);
882 EXPORT_SYMBOL_GPL(em28xx_uninit_isoc);
885 * Allocate URBs and start IRQ
887 int em28xx_init_isoc(struct em28xx *dev, int max_packets,
888 int num_bufs, int max_pkt_size,
889 int (*isoc_copy) (struct em28xx *dev, struct urb *urb))
891 struct em28xx_dmaqueue *dma_q = &dev->vidq;
898 em28xx_isocdbg("em28xx: called em28xx_prepare_isoc\n");
900 /* De-allocates all pending stuff */
901 em28xx_uninit_isoc(dev);
903 dev->isoc_ctl.isoc_copy = isoc_copy;
904 dev->isoc_ctl.num_bufs = num_bufs;
906 dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs, GFP_KERNEL);
907 if (!dev->isoc_ctl.urb) {
908 em28xx_errdev("cannot alloc memory for usb buffers\n");
912 dev->isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
914 if (!dev->isoc_ctl.transfer_buffer) {
915 em28xx_errdev("cannot allocate memory for usbtransfer\n");
916 kfree(dev->isoc_ctl.urb);
920 dev->isoc_ctl.max_pkt_size = max_pkt_size;
921 dev->isoc_ctl.buf = NULL;
923 sb_size = max_packets * dev->isoc_ctl.max_pkt_size;
925 /* allocate urbs and transfer buffers */
926 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
927 urb = usb_alloc_urb(max_packets, GFP_KERNEL);
929 em28xx_err("cannot alloc isoc_ctl.urb %i\n", i);
930 em28xx_uninit_isoc(dev);
933 dev->isoc_ctl.urb[i] = urb;
935 dev->isoc_ctl.transfer_buffer[i] = usb_buffer_alloc(dev->udev,
936 sb_size, GFP_KERNEL, &urb->transfer_dma);
937 if (!dev->isoc_ctl.transfer_buffer[i]) {
938 em28xx_err("unable to allocate %i bytes for transfer"
941 in_interrupt()?" while in int":"");
942 em28xx_uninit_isoc(dev);
945 memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size);
947 /* FIXME: this is a hack - should be
948 'desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK'
949 should also be using 'desc.bInterval'
951 pipe = usb_rcvisocpipe(dev->udev,
952 dev->mode == EM28XX_ANALOG_MODE ? 0x82 : 0x84);
954 usb_fill_int_urb(urb, dev->udev, pipe,
955 dev->isoc_ctl.transfer_buffer[i], sb_size,
956 em28xx_irq_callback, dma_q, 1);
958 urb->number_of_packets = max_packets;
959 urb->transfer_flags = URB_ISO_ASAP;
962 for (j = 0; j < max_packets; j++) {
963 urb->iso_frame_desc[j].offset = k;
964 urb->iso_frame_desc[j].length =
965 dev->isoc_ctl.max_pkt_size;
966 k += dev->isoc_ctl.max_pkt_size;
970 init_waitqueue_head(&dma_q->wq);
972 em28xx_capture_start(dev, 1);
974 /* submit urbs and enables IRQ */
975 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
976 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_ATOMIC);
978 em28xx_err("submit of urb %i failed (error=%i)\n", i,
980 em28xx_uninit_isoc(dev);
987 EXPORT_SYMBOL_GPL(em28xx_init_isoc);
991 * configure i2c attached devices
993 void em28xx_wake_i2c(struct em28xx *dev)
995 struct v4l2_routing route;
998 route.input = INPUT(dev->ctl_input)->vmux;
1000 em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, &zero);
1001 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
1002 em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
1006 * Device control list
1009 static LIST_HEAD(em28xx_devlist);
1010 static DEFINE_MUTEX(em28xx_devlist_mutex);
1012 struct em28xx *em28xx_get_device(int minor,
1013 enum v4l2_buf_type *fh_type,
1016 struct em28xx *h, *dev = NULL;
1018 *fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1021 mutex_lock(&em28xx_devlist_mutex);
1022 list_for_each_entry(h, &em28xx_devlist, devlist) {
1023 if (h->vdev->minor == minor)
1025 if (h->vbi_dev->minor == minor) {
1027 *fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
1030 h->radio_dev->minor == minor) {
1035 mutex_unlock(&em28xx_devlist_mutex);
1041 * em28xx_realease_resources()
1042 * unregisters the v4l2,i2c and usb devices
1043 * called when the device gets disconected or at module unload
1045 void em28xx_remove_from_devlist(struct em28xx *dev)
1047 mutex_lock(&em28xx_devlist_mutex);
1048 list_del(&dev->devlist);
1049 mutex_unlock(&em28xx_devlist_mutex);
1052 void em28xx_add_into_devlist(struct em28xx *dev)
1054 mutex_lock(&em28xx_devlist_mutex);
1055 list_add_tail(&dev->devlist, &em28xx_devlist);
1056 mutex_unlock(&em28xx_devlist_mutex);
1060 * Extension interface
1063 static LIST_HEAD(em28xx_extension_devlist);
1064 static DEFINE_MUTEX(em28xx_extension_devlist_lock);
1066 int em28xx_register_extension(struct em28xx_ops *ops)
1068 struct em28xx *dev = NULL;
1070 mutex_lock(&em28xx_devlist_mutex);
1071 mutex_lock(&em28xx_extension_devlist_lock);
1072 list_add_tail(&ops->next, &em28xx_extension_devlist);
1073 list_for_each_entry(dev, &em28xx_devlist, devlist) {
1077 printk(KERN_INFO "Em28xx: Initialized (%s) extension\n", ops->name);
1078 mutex_unlock(&em28xx_extension_devlist_lock);
1079 mutex_unlock(&em28xx_devlist_mutex);
1082 EXPORT_SYMBOL(em28xx_register_extension);
1084 void em28xx_unregister_extension(struct em28xx_ops *ops)
1086 struct em28xx *dev = NULL;
1088 mutex_lock(&em28xx_devlist_mutex);
1089 list_for_each_entry(dev, &em28xx_devlist, devlist) {
1094 mutex_lock(&em28xx_extension_devlist_lock);
1095 printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
1096 list_del(&ops->next);
1097 mutex_unlock(&em28xx_extension_devlist_lock);
1098 mutex_unlock(&em28xx_devlist_mutex);
1100 EXPORT_SYMBOL(em28xx_unregister_extension);
1102 void em28xx_init_extension(struct em28xx *dev)
1104 struct em28xx_ops *ops = NULL;
1106 mutex_lock(&em28xx_extension_devlist_lock);
1107 if (!list_empty(&em28xx_extension_devlist)) {
1108 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1113 mutex_unlock(&em28xx_extension_devlist_lock);
1116 void em28xx_close_extension(struct em28xx *dev)
1118 struct em28xx_ops *ops = NULL;
1120 mutex_lock(&em28xx_extension_devlist_lock);
1121 if (!list_empty(&em28xx_extension_devlist)) {
1122 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1127 mutex_unlock(&em28xx_extension_devlist_lock);