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>
8 Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
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.
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.
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.
25 #include <linux/init.h>
26 #include <linux/list.h>
27 #include <linux/module.h>
28 #include <linux/slab.h>
29 #include <linux/usb.h>
30 #include <linux/vmalloc.h>
31 #include <sound/ac97_codec.h>
32 #include <media/v4l2-common.h>
36 /* #define ENABLE_DEBUG_ISOC_FRAMES */
38 static unsigned int core_debug;
39 module_param(core_debug, int, 0644);
40 MODULE_PARM_DESC(core_debug, "enable debug messages [core]");
42 #define em28xx_coredbg(fmt, arg...) do {\
44 printk(KERN_INFO "%s %s :"fmt, \
45 dev->name, __func__ , ##arg); } while (0)
47 static unsigned int reg_debug;
48 module_param(reg_debug, int, 0644);
49 MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]");
51 #define em28xx_regdbg(fmt, arg...) do {\
53 printk(KERN_INFO "%s %s :"fmt, \
54 dev->name, __func__ , ##arg); } while (0)
57 module_param(alt, int, 0644);
58 MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
60 static unsigned int disable_vbi;
61 module_param(disable_vbi, int, 0644);
62 MODULE_PARM_DESC(disable_vbi, "disable vbi support");
65 #define em28xx_isocdbg(fmt, arg...) do {\
67 printk(KERN_INFO "%s %s :"fmt, \
68 dev->name, __func__ , ##arg); } while (0)
71 * em28xx_read_reg_req()
72 * reads data from the usb device specifying bRequest
74 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
78 int pipe = usb_rcvctrlpipe(dev->udev, 0);
80 if (dev->disconnected)
83 if (len > URB_MAX_CTRL_SIZE)
87 printk(KERN_DEBUG "(pipe 0x%08x): "
88 "IN: %02x %02x %02x %02x %02x %02x %02x %02x ",
90 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
93 len & 0xff, len >> 8);
96 mutex_lock(&dev->ctrl_urb_lock);
97 ret = usb_control_msg(dev->udev, pipe, req,
98 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
99 0x0000, reg, dev->urb_buf, len, HZ);
102 printk(" failed!\n");
103 mutex_unlock(&dev->ctrl_urb_lock);
104 return usb_translate_errors(ret);
108 memcpy(buf, dev->urb_buf, len);
110 mutex_unlock(&dev->ctrl_urb_lock);
116 for (byte = 0; byte < len; byte++)
117 printk(" %02x", (unsigned char)buf[byte]);
125 * em28xx_read_reg_req()
126 * reads data from the usb device specifying bRequest
128 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
133 ret = em28xx_read_reg_req_len(dev, req, reg, &val, 1);
140 int em28xx_read_reg(struct em28xx *dev, u16 reg)
142 return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
144 EXPORT_SYMBOL_GPL(em28xx_read_reg);
147 * em28xx_write_regs_req()
148 * sends data to the usb device, specifying bRequest
150 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
154 int pipe = usb_sndctrlpipe(dev->udev, 0);
156 if (dev->disconnected)
159 if ((len < 1) || (len > URB_MAX_CTRL_SIZE))
165 printk(KERN_DEBUG "(pipe 0x%08x): "
166 "OUT: %02x %02x %02x %02x %02x %02x %02x %02x >>>",
168 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
170 reg & 0xff, reg >> 8,
171 len & 0xff, len >> 8);
173 for (byte = 0; byte < len; byte++)
174 printk(" %02x", (unsigned char)buf[byte]);
178 mutex_lock(&dev->ctrl_urb_lock);
179 memcpy(dev->urb_buf, buf, len);
180 ret = usb_control_msg(dev->udev, pipe, req,
181 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
182 0x0000, reg, dev->urb_buf, len, HZ);
183 mutex_unlock(&dev->ctrl_urb_lock);
186 return usb_translate_errors(ret);
188 if (dev->wait_after_write)
189 msleep(dev->wait_after_write);
194 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
198 rc = em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
200 /* Stores GPO/GPIO values at the cache, if changed
201 Only write values should be stored, since input on a GPIO
202 register will return the input bits.
203 Not sure what happens on reading GPO register.
206 if (reg == dev->reg_gpo_num)
207 dev->reg_gpo = buf[0];
208 else if (reg == dev->reg_gpio_num)
209 dev->reg_gpio = buf[0];
214 EXPORT_SYMBOL_GPL(em28xx_write_regs);
216 /* Write a single register */
217 int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
219 return em28xx_write_regs(dev, reg, &val, 1);
221 EXPORT_SYMBOL_GPL(em28xx_write_reg);
224 * em28xx_write_reg_bits()
225 * sets only some bits (specified by bitmask) of a register, by first reading
228 int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
234 /* Uses cache for gpo/gpio registers */
235 if (reg == dev->reg_gpo_num)
236 oldval = dev->reg_gpo;
237 else if (reg == dev->reg_gpio_num)
238 oldval = dev->reg_gpio;
240 oldval = em28xx_read_reg(dev, reg);
245 newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
247 return em28xx_write_regs(dev, reg, &newval, 1);
249 EXPORT_SYMBOL_GPL(em28xx_write_reg_bits);
252 * em28xx_is_ac97_ready()
253 * Checks if ac97 is ready
255 static int em28xx_is_ac97_ready(struct em28xx *dev)
259 /* Wait up to 50 ms for AC97 command to complete */
260 for (i = 0; i < 10; i++, msleep(5)) {
261 ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
269 em28xx_warn("AC97 command still being executed: not handled properly!\n");
275 * write a 16 bit value to the specified AC97 address (LSB first!)
277 int em28xx_read_ac97(struct em28xx *dev, u8 reg)
280 u8 addr = (reg & 0x7f) | 0x80;
283 ret = em28xx_is_ac97_ready(dev);
287 ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
291 ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
292 (u8 *)&val, sizeof(val));
296 return le16_to_cpu(val);
298 EXPORT_SYMBOL_GPL(em28xx_read_ac97);
301 * em28xx_write_ac97()
302 * write a 16 bit value to the specified AC97 address (LSB first!)
304 int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
307 u8 addr = reg & 0x7f;
310 value = cpu_to_le16(val);
312 ret = em28xx_is_ac97_ready(dev);
316 ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *) &value, 2);
320 ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
326 EXPORT_SYMBOL_GPL(em28xx_write_ac97);
328 struct em28xx_vol_itable {
329 enum em28xx_amux mux;
333 static struct em28xx_vol_itable inputs[] = {
334 { EM28XX_AMUX_VIDEO, AC97_VIDEO },
335 { EM28XX_AMUX_LINE_IN, AC97_LINE },
336 { EM28XX_AMUX_PHONE, AC97_PHONE },
337 { EM28XX_AMUX_MIC, AC97_MIC },
338 { EM28XX_AMUX_CD, AC97_CD },
339 { EM28XX_AMUX_AUX, AC97_AUX },
340 { EM28XX_AMUX_PCM_OUT, AC97_PCM },
343 static int set_ac97_input(struct em28xx *dev)
346 enum em28xx_amux amux = dev->ctl_ainput;
348 /* EM28XX_AMUX_VIDEO2 is a special case used to indicate that
349 em28xx should point to LINE IN, while AC97 should use VIDEO
351 if (amux == EM28XX_AMUX_VIDEO2)
352 amux = EM28XX_AMUX_VIDEO;
354 /* Mute all entres but the one that were selected */
355 for (i = 0; i < ARRAY_SIZE(inputs); i++) {
356 if (amux == inputs[i].mux)
357 ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
359 ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
362 em28xx_warn("couldn't setup AC97 register %d\n",
368 static int em28xx_set_audio_source(struct em28xx *dev)
373 if (dev->board.is_em2800) {
374 if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
375 input = EM2800_AUDIO_SRC_TUNER;
377 input = EM2800_AUDIO_SRC_LINE;
379 ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
384 if (dev->board.has_msp34xx)
385 input = EM28XX_AUDIO_SRC_TUNER;
387 switch (dev->ctl_ainput) {
388 case EM28XX_AMUX_VIDEO:
389 input = EM28XX_AUDIO_SRC_TUNER;
392 input = EM28XX_AUDIO_SRC_LINE;
397 if (dev->board.mute_gpio && dev->mute)
398 em28xx_gpio_set(dev, dev->board.mute_gpio);
400 em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
402 ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
407 switch (dev->audio_mode.ac97) {
411 ret = set_ac97_input(dev);
417 struct em28xx_vol_otable {
418 enum em28xx_aout mux;
422 static const struct em28xx_vol_otable outputs[] = {
423 { EM28XX_AOUT_MASTER, AC97_MASTER },
424 { EM28XX_AOUT_LINE, AC97_HEADPHONE },
425 { EM28XX_AOUT_MONO, AC97_MASTER_MONO },
426 { EM28XX_AOUT_LFE, AC97_CENTER_LFE_MASTER },
427 { EM28XX_AOUT_SURR, AC97_SURROUND_MASTER },
430 int em28xx_audio_analog_set(struct em28xx *dev)
435 if (!dev->audio_mode.has_audio)
438 /* It is assumed that all devices use master volume for output.
439 It would be possible to use also line output.
441 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
442 /* Mute all outputs */
443 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
444 ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
446 em28xx_warn("couldn't setup AC97 register %d\n",
451 xclk = dev->board.xclk & 0x7f;
453 xclk |= EM28XX_XCLK_AUDIO_UNMUTE;
455 ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
460 /* Selects the proper audio input */
461 ret = em28xx_set_audio_source(dev);
464 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
467 em28xx_write_ac97(dev, AC97_POWERDOWN, 0x4200);
468 em28xx_write_ac97(dev, AC97_EXTENDED_STATUS, 0x0031);
469 em28xx_write_ac97(dev, AC97_PCM_LR_ADC_RATE, 0xbb80);
471 /* LSB: left channel - both channels with the same level */
472 vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
474 /* Mute device, if needed */
479 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
480 if (dev->ctl_aoutput & outputs[i].mux)
481 ret = em28xx_write_ac97(dev, outputs[i].reg,
484 em28xx_warn("couldn't setup AC97 register %d\n",
488 if (dev->ctl_aoutput & EM28XX_AOUT_PCM_IN) {
489 int sel = ac97_return_record_select(dev->ctl_aoutput);
491 /* Use the same input for both left and right
495 em28xx_write_ac97(dev, AC97_REC_SEL, sel);
501 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
503 int em28xx_audio_setup(struct em28xx *dev)
505 int vid1, vid2, feat, cfg;
508 if (dev->chip_id == CHIP_ID_EM2870 || dev->chip_id == CHIP_ID_EM2874
509 || dev->chip_id == CHIP_ID_EM28174) {
510 /* Digital only device - don't load any alsa module */
511 dev->audio_mode.has_audio = false;
512 dev->has_audio_class = false;
513 dev->has_alsa_audio = false;
517 dev->audio_mode.has_audio = true;
519 /* See how this device is configured */
520 cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
521 em28xx_info("Config register raw data: 0x%02x\n", cfg);
523 /* Register read error? */
524 cfg = EM28XX_CHIPCFG_AC97; /* Be conservative */
525 } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
526 /* The device doesn't have vendor audio at all */
527 dev->has_alsa_audio = false;
528 dev->audio_mode.has_audio = false;
530 } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
531 EM28XX_CHIPCFG_I2S_3_SAMPRATES) {
532 em28xx_info("I2S Audio (3 sample rates)\n");
533 dev->audio_mode.i2s_3rates = 1;
534 } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
535 EM28XX_CHIPCFG_I2S_5_SAMPRATES) {
536 em28xx_info("I2S Audio (5 sample rates)\n");
537 dev->audio_mode.i2s_5rates = 1;
540 if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
541 /* Skip the code that does AC97 vendor detection */
542 dev->audio_mode.ac97 = EM28XX_NO_AC97;
546 dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
548 vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
551 * Device likely doesn't support AC97
552 * Note: (some) em2800 devices without eeprom reports 0x91 on
553 * CHIPCFG register, even not having an AC97 chip
555 em28xx_warn("AC97 chip type couldn't be determined\n");
556 dev->audio_mode.ac97 = EM28XX_NO_AC97;
557 dev->has_alsa_audio = false;
558 dev->audio_mode.has_audio = false;
562 vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
566 vid = vid1 << 16 | vid2;
568 dev->audio_mode.ac97_vendor_id = vid;
569 em28xx_warn("AC97 vendor ID = 0x%08x\n", vid);
571 feat = em28xx_read_ac97(dev, AC97_RESET);
575 dev->audio_mode.ac97_feat = feat;
576 em28xx_warn("AC97 features = 0x%04x\n", feat);
578 /* Try to identify what audio processor we have */
579 if (((vid == 0xffffffff) || (vid == 0x83847650)) && (feat == 0x6a90))
580 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
581 else if ((vid >> 8) == 0x838476)
582 dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
585 /* Reports detected AC97 processor */
586 switch (dev->audio_mode.ac97) {
588 em28xx_info("No AC97 audio processor\n");
590 case EM28XX_AC97_EM202:
591 em28xx_info("Empia 202 AC97 audio processor detected\n");
593 case EM28XX_AC97_SIGMATEL:
594 em28xx_info("Sigmatel audio processor detected(stac 97%02x)\n",
595 dev->audio_mode.ac97_vendor_id & 0xff);
597 case EM28XX_AC97_OTHER:
598 em28xx_warn("Unknown AC97 audio processor detected!\n");
604 return em28xx_audio_analog_set(dev);
606 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
608 int em28xx_colorlevels_set_default(struct em28xx *dev)
610 em28xx_write_reg(dev, EM28XX_R20_YGAIN, CONTRAST_DEFAULT);
611 em28xx_write_reg(dev, EM28XX_R21_YOFFSET, BRIGHTNESS_DEFAULT);
612 em28xx_write_reg(dev, EM28XX_R22_UVGAIN, SATURATION_DEFAULT);
613 em28xx_write_reg(dev, EM28XX_R23_UOFFSET, BLUE_BALANCE_DEFAULT);
614 em28xx_write_reg(dev, EM28XX_R24_VOFFSET, RED_BALANCE_DEFAULT);
615 em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, SHARPNESS_DEFAULT);
617 em28xx_write_reg(dev, EM28XX_R14_GAMMA, 0x20);
618 em28xx_write_reg(dev, EM28XX_R15_RGAIN, 0x20);
619 em28xx_write_reg(dev, EM28XX_R16_GGAIN, 0x20);
620 em28xx_write_reg(dev, EM28XX_R17_BGAIN, 0x20);
621 em28xx_write_reg(dev, EM28XX_R18_ROFFSET, 0x00);
622 em28xx_write_reg(dev, EM28XX_R19_GOFFSET, 0x00);
623 return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
626 int em28xx_capture_start(struct em28xx *dev, int start)
630 if (dev->chip_id == CHIP_ID_EM2874 ||
631 dev->chip_id == CHIP_ID_EM2884 ||
632 dev->chip_id == CHIP_ID_EM28174) {
633 /* The Transport Stream Enable Register moved in em2874 */
635 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
637 EM2874_TS1_CAPTURE_ENABLE);
641 /* Enable Transport Stream */
642 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
643 EM2874_TS1_CAPTURE_ENABLE,
644 EM2874_TS1_CAPTURE_ENABLE);
649 /* FIXME: which is the best order? */
650 /* video registers are sampled by VREF */
651 rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
652 start ? 0x10 : 0x00, 0x10);
657 /* disable video capture */
658 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
662 if (dev->board.is_webcam)
663 rc = em28xx_write_reg(dev, 0x13, 0x0c);
665 /* enable video capture */
666 rc = em28xx_write_reg(dev, 0x48, 0x00);
668 if (dev->mode == EM28XX_ANALOG_MODE)
669 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
671 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
678 int em28xx_vbi_supported(struct em28xx *dev)
680 /* Modprobe option to manually disable */
681 if (disable_vbi == 1)
684 if (dev->board.is_webcam)
687 /* FIXME: check subdevices for VBI support */
689 if (dev->chip_id == CHIP_ID_EM2860 ||
690 dev->chip_id == CHIP_ID_EM2883)
693 /* Version of em28xx that does not support VBI */
697 int em28xx_set_outfmt(struct em28xx *dev)
702 fmt = dev->format->reg;
706 * NOTE: it's not clear if this is really needed !
707 * The datasheets say bit 5 is a reserved bit and devices seem to work
708 * fine without it. But the Windows driver sets it for em2710/50+em28xx
709 * devices and we've always been setting it, too.
711 * em2765 (em25xx, em276x/7x/8x) devices do NOT work with this bit set,
712 * it's likely used for an additional (compressed ?) format there.
714 ret = em28xx_write_reg(dev, EM28XX_R27_OUTFMT, fmt);
718 ret = em28xx_write_reg(dev, EM28XX_R10_VINMODE, dev->vinmode);
722 vinctrl = dev->vinctl;
723 if (em28xx_vbi_supported(dev) == 1) {
724 vinctrl |= EM28XX_VINCTRL_VBI_RAW;
725 em28xx_write_reg(dev, EM28XX_R34_VBI_START_H, 0x00);
726 em28xx_write_reg(dev, EM28XX_R36_VBI_WIDTH, dev->vbi_width/4);
727 em28xx_write_reg(dev, EM28XX_R37_VBI_HEIGHT, dev->vbi_height);
728 if (dev->norm & V4L2_STD_525_60) {
730 em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x09);
731 } else if (dev->norm & V4L2_STD_625_50) {
733 em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x07);
737 return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, vinctrl);
740 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
743 em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
744 xmin, ymin, xmax, ymax);
746 em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
747 em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
748 em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
749 return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
752 static void em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
753 u16 width, u16 height)
755 u8 cwidth = width >> 2;
756 u8 cheight = height >> 2;
757 u8 overflow = (height >> 9 & 0x02) | (width >> 10 & 0x01);
758 /* NOTE: size limit: 2047x1023 = 2MPix */
760 em28xx_coredbg("capture area set to (%d,%d): %dx%d\n",
762 ((overflow & 2) << 9 | cwidth << 2),
763 ((overflow & 1) << 10 | cheight << 2));
765 em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
766 em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
767 em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
768 em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
769 em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
771 /* FIXME: function/meaning of these registers ? */
772 /* FIXME: align width+height to multiples of 4 ?! */
773 if (dev->is_em25xx) {
774 em28xx_write_reg(dev, 0x34, width >> 4);
775 em28xx_write_reg(dev, 0x35, height >> 4);
779 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
782 /* the em2800 scaler only supports scaling down to 50% */
784 if (dev->board.is_em2800) {
785 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
791 em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);
795 em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
796 /* it seems that both H and V scalers must be active
798 mode = (h || v) ? 0x30 : 0x00;
800 return em28xx_write_reg_bits(dev, EM28XX_R26_COMPR, mode, 0x30);
803 /* FIXME: this only function read values from dev */
804 int em28xx_resolution_set(struct em28xx *dev)
807 width = norm_maxw(dev);
808 height = norm_maxh(dev);
810 /* Properly setup VBI */
811 dev->vbi_width = 720;
812 if (dev->norm & V4L2_STD_525_60)
813 dev->vbi_height = 12;
815 dev->vbi_height = 18;
817 em28xx_set_outfmt(dev);
819 em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
821 /* If we don't set the start position to 2 in VBI mode, we end up
822 with line 20/21 being YUYV encoded instead of being in 8-bit
823 greyscale. The core of the issue is that line 21 (and line 23 for
824 PAL WSS) are inside of active video region, and as a result they
825 get the pixelformatting associated with that area. So by cropping
826 it out, we end up with the same format as the rest of the VBI
828 if (em28xx_vbi_supported(dev) == 1)
829 em28xx_capture_area_set(dev, 0, 2, width, height);
831 em28xx_capture_area_set(dev, 0, 0, width, height);
833 return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
836 /* Set USB alternate setting for analog video */
837 int em28xx_set_alternate(struct em28xx *dev)
841 unsigned int min_pkt_size = dev->width * 2 + 4;
843 /* NOTE: for isoc transfers, only alt settings > 0 are allowed
844 bulk transfers seem to work only with alt=0 ! */
846 if ((alt > 0) && (alt < dev->num_alt)) {
847 em28xx_coredbg("alternate forced to %d\n", dev->alt);
851 if (dev->analog_xfer_bulk)
854 /* When image size is bigger than a certain value,
855 the frame size should be increased, otherwise, only
856 green screen will be received.
858 if (dev->width * 2 * dev->height > 720 * 240 * 2)
861 for (i = 0; i < dev->num_alt; i++) {
862 /* stop when the selected alt setting offers enough bandwidth */
863 if (dev->alt_max_pkt_size_isoc[i] >= min_pkt_size) {
866 /* otherwise make sure that we end up with the maximum bandwidth
867 because the min_pkt_size equation might be wrong...
869 } else if (dev->alt_max_pkt_size_isoc[i] >
870 dev->alt_max_pkt_size_isoc[dev->alt])
875 /* NOTE: for bulk transfers, we need to call usb_set_interface()
876 * even if the previous settings were the same. Otherwise streaming
877 * fails with all urbs having status = -EOVERFLOW ! */
878 if (dev->analog_xfer_bulk) {
879 dev->max_pkt_size = 512; /* USB 2.0 spec */
880 dev->packet_multiplier = EM28XX_BULK_PACKET_MULTIPLIER;
882 em28xx_coredbg("minimum isoc packet size: %u (alt=%d)\n",
883 min_pkt_size, dev->alt);
885 dev->alt_max_pkt_size_isoc[dev->alt];
886 dev->packet_multiplier = EM28XX_NUM_ISOC_PACKETS;
888 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n",
889 dev->alt, dev->max_pkt_size);
890 errCode = usb_set_interface(dev->udev, 0, dev->alt);
892 em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
899 int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
906 if (dev->mode != EM28XX_SUSPEND) {
907 em28xx_write_reg(dev, 0x48, 0x00);
908 if (dev->mode == EM28XX_ANALOG_MODE)
909 em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
911 em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
915 /* Send GPIO reset sequences specified at board entry */
916 while (gpio->sleep >= 0) {
917 if (gpio->reg >= 0) {
918 rc = em28xx_write_reg_bits(dev,
932 EXPORT_SYMBOL_GPL(em28xx_gpio_set);
934 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
936 if (dev->mode == set_mode)
939 if (set_mode == EM28XX_SUSPEND) {
940 dev->mode = set_mode;
942 /* FIXME: add suspend support for ac97 */
944 return em28xx_gpio_set(dev, dev->board.suspend_gpio);
947 dev->mode = set_mode;
949 if (dev->mode == EM28XX_DIGITAL_MODE)
950 return em28xx_gpio_set(dev, dev->board.dvb_gpio);
952 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
954 EXPORT_SYMBOL_GPL(em28xx_set_mode);
956 /* ------------------------------------------------------------------
958 ------------------------------------------------------------------*/
961 * URB completion handler for isoc/bulk transfers
963 static void em28xx_irq_callback(struct urb *urb)
965 struct em28xx *dev = urb->context;
968 switch (urb->status) {
969 case 0: /* success */
970 case -ETIMEDOUT: /* NAK */
972 case -ECONNRESET: /* kill */
977 em28xx_isocdbg("urb completition error %d.\n", urb->status);
981 /* Copy data from URB */
982 spin_lock(&dev->slock);
983 dev->usb_ctl.urb_data_copy(dev, urb);
984 spin_unlock(&dev->slock);
986 /* Reset urb buffers */
987 for (i = 0; i < urb->number_of_packets; i++) {
988 /* isoc only (bulk: number_of_packets = 0) */
989 urb->iso_frame_desc[i].status = 0;
990 urb->iso_frame_desc[i].actual_length = 0;
994 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
996 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
1002 * Stop and Deallocate URBs
1004 void em28xx_uninit_usb_xfer(struct em28xx *dev, enum em28xx_mode mode)
1007 struct em28xx_usb_bufs *usb_bufs;
1010 em28xx_isocdbg("em28xx: called em28xx_uninit_usb_xfer in mode %d\n",
1013 if (mode == EM28XX_DIGITAL_MODE)
1014 usb_bufs = &dev->usb_ctl.digital_bufs;
1016 usb_bufs = &dev->usb_ctl.analog_bufs;
1018 for (i = 0; i < usb_bufs->num_bufs; i++) {
1019 urb = usb_bufs->urb[i];
1021 if (!irqs_disabled())
1024 usb_unlink_urb(urb);
1026 if (usb_bufs->transfer_buffer[i]) {
1027 usb_free_coherent(dev->udev,
1028 urb->transfer_buffer_length,
1029 usb_bufs->transfer_buffer[i],
1033 usb_bufs->urb[i] = NULL;
1035 usb_bufs->transfer_buffer[i] = NULL;
1038 kfree(usb_bufs->urb);
1039 kfree(usb_bufs->transfer_buffer);
1041 usb_bufs->urb = NULL;
1042 usb_bufs->transfer_buffer = NULL;
1043 usb_bufs->num_bufs = 0;
1045 em28xx_capture_start(dev, 0);
1047 EXPORT_SYMBOL_GPL(em28xx_uninit_usb_xfer);
1052 void em28xx_stop_urbs(struct em28xx *dev)
1056 struct em28xx_usb_bufs *isoc_bufs = &dev->usb_ctl.digital_bufs;
1058 em28xx_isocdbg("em28xx: called em28xx_stop_urbs\n");
1060 for (i = 0; i < isoc_bufs->num_bufs; i++) {
1061 urb = isoc_bufs->urb[i];
1063 if (!irqs_disabled())
1066 usb_unlink_urb(urb);
1070 em28xx_capture_start(dev, 0);
1072 EXPORT_SYMBOL_GPL(em28xx_stop_urbs);
1077 int em28xx_alloc_urbs(struct em28xx *dev, enum em28xx_mode mode, int xfer_bulk,
1078 int num_bufs, int max_pkt_size, int packet_multiplier)
1080 struct em28xx_usb_bufs *usb_bufs;
1086 em28xx_isocdbg("em28xx: called em28xx_alloc_isoc in mode %d\n", mode);
1088 /* Check mode and if we have an endpoint for the selected
1089 transfer type, select buffer */
1090 if (mode == EM28XX_DIGITAL_MODE) {
1091 if ((xfer_bulk && !dev->dvb_ep_bulk) ||
1092 (!xfer_bulk && !dev->dvb_ep_isoc)) {
1093 em28xx_errdev("no endpoint for DVB mode and transfer type %d\n",
1097 usb_bufs = &dev->usb_ctl.digital_bufs;
1098 } else if (mode == EM28XX_ANALOG_MODE) {
1099 if ((xfer_bulk && !dev->analog_ep_bulk) ||
1100 (!xfer_bulk && !dev->analog_ep_isoc)) {
1101 em28xx_errdev("no endpoint for analog mode and transfer type %d\n",
1105 usb_bufs = &dev->usb_ctl.analog_bufs;
1107 em28xx_errdev("invalid mode selected\n");
1111 /* De-allocates all pending stuff */
1112 em28xx_uninit_usb_xfer(dev, mode);
1114 usb_bufs->num_bufs = num_bufs;
1116 usb_bufs->urb = kzalloc(sizeof(void *)*num_bufs, GFP_KERNEL);
1117 if (!usb_bufs->urb) {
1118 em28xx_errdev("cannot alloc memory for usb buffers\n");
1122 usb_bufs->transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
1124 if (!usb_bufs->transfer_buffer) {
1125 em28xx_errdev("cannot allocate memory for usb transfer\n");
1126 kfree(usb_bufs->urb);
1130 usb_bufs->max_pkt_size = max_pkt_size;
1132 usb_bufs->num_packets = 0;
1134 usb_bufs->num_packets = packet_multiplier;
1135 dev->usb_ctl.vid_buf = NULL;
1136 dev->usb_ctl.vbi_buf = NULL;
1138 sb_size = packet_multiplier * usb_bufs->max_pkt_size;
1140 /* allocate urbs and transfer buffers */
1141 for (i = 0; i < usb_bufs->num_bufs; i++) {
1142 urb = usb_alloc_urb(usb_bufs->num_packets, GFP_KERNEL);
1144 em28xx_err("cannot alloc usb_ctl.urb %i\n", i);
1145 em28xx_uninit_usb_xfer(dev, mode);
1148 usb_bufs->urb[i] = urb;
1150 usb_bufs->transfer_buffer[i] = usb_alloc_coherent(dev->udev,
1151 sb_size, GFP_KERNEL, &urb->transfer_dma);
1152 if (!usb_bufs->transfer_buffer[i]) {
1153 em28xx_err("unable to allocate %i bytes for transfer"
1156 in_interrupt() ? " while in int" : "");
1157 em28xx_uninit_usb_xfer(dev, mode);
1160 memset(usb_bufs->transfer_buffer[i], 0, sb_size);
1162 if (xfer_bulk) { /* bulk */
1163 pipe = usb_rcvbulkpipe(dev->udev,
1164 mode == EM28XX_ANALOG_MODE ?
1165 dev->analog_ep_bulk :
1167 usb_fill_bulk_urb(urb, dev->udev, pipe,
1168 usb_bufs->transfer_buffer[i], sb_size,
1169 em28xx_irq_callback, dev);
1170 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1172 pipe = usb_rcvisocpipe(dev->udev,
1173 mode == EM28XX_ANALOG_MODE ?
1174 dev->analog_ep_isoc :
1176 usb_fill_int_urb(urb, dev->udev, pipe,
1177 usb_bufs->transfer_buffer[i], sb_size,
1178 em28xx_irq_callback, dev, 1);
1179 urb->transfer_flags = URB_ISO_ASAP |
1180 URB_NO_TRANSFER_DMA_MAP;
1182 for (j = 0; j < usb_bufs->num_packets; j++) {
1183 urb->iso_frame_desc[j].offset = k;
1184 urb->iso_frame_desc[j].length =
1185 usb_bufs->max_pkt_size;
1186 k += usb_bufs->max_pkt_size;
1190 urb->number_of_packets = usb_bufs->num_packets;
1195 EXPORT_SYMBOL_GPL(em28xx_alloc_urbs);
1198 * Allocate URBs and start IRQ
1200 int em28xx_init_usb_xfer(struct em28xx *dev, enum em28xx_mode mode,
1201 int xfer_bulk, int num_bufs, int max_pkt_size,
1202 int packet_multiplier,
1203 int (*urb_data_copy) (struct em28xx *dev, struct urb *urb))
1205 struct em28xx_dmaqueue *dma_q = &dev->vidq;
1206 struct em28xx_dmaqueue *vbi_dma_q = &dev->vbiq;
1207 struct em28xx_usb_bufs *usb_bufs;
1212 em28xx_isocdbg("em28xx: called em28xx_init_usb_xfer in mode %d\n",
1215 dev->usb_ctl.urb_data_copy = urb_data_copy;
1217 if (mode == EM28XX_DIGITAL_MODE) {
1218 usb_bufs = &dev->usb_ctl.digital_bufs;
1219 /* no need to free/alloc usb buffers in digital mode */
1222 usb_bufs = &dev->usb_ctl.analog_bufs;
1227 rc = em28xx_alloc_urbs(dev, mode, xfer_bulk, num_bufs,
1228 max_pkt_size, packet_multiplier);
1234 rc = usb_clear_halt(dev->udev, usb_bufs->urb[0]->pipe);
1236 em28xx_err("failed to clear USB bulk endpoint stall/halt condition (error=%i)\n",
1238 em28xx_uninit_usb_xfer(dev, mode);
1243 init_waitqueue_head(&dma_q->wq);
1244 init_waitqueue_head(&vbi_dma_q->wq);
1246 em28xx_capture_start(dev, 1);
1248 /* submit urbs and enables IRQ */
1249 for (i = 0; i < usb_bufs->num_bufs; i++) {
1250 rc = usb_submit_urb(usb_bufs->urb[i], GFP_ATOMIC);
1252 em28xx_err("submit of urb %i failed (error=%i)\n", i,
1254 em28xx_uninit_usb_xfer(dev, mode);
1261 EXPORT_SYMBOL_GPL(em28xx_init_usb_xfer);
1265 * configure i2c attached devices
1267 void em28xx_wake_i2c(struct em28xx *dev)
1269 v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 0);
1270 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
1271 INPUT(dev->ctl_input)->vmux, 0, 0);
1272 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
1276 * Device control list
1279 static LIST_HEAD(em28xx_devlist);
1280 static DEFINE_MUTEX(em28xx_devlist_mutex);
1283 * Extension interface
1286 static LIST_HEAD(em28xx_extension_devlist);
1288 int em28xx_register_extension(struct em28xx_ops *ops)
1290 struct em28xx *dev = NULL;
1292 mutex_lock(&em28xx_devlist_mutex);
1293 list_add_tail(&ops->next, &em28xx_extension_devlist);
1294 list_for_each_entry(dev, &em28xx_devlist, devlist) {
1297 mutex_unlock(&em28xx_devlist_mutex);
1298 printk(KERN_INFO "Em28xx: Initialized (%s) extension\n", ops->name);
1301 EXPORT_SYMBOL(em28xx_register_extension);
1303 void em28xx_unregister_extension(struct em28xx_ops *ops)
1305 struct em28xx *dev = NULL;
1307 mutex_lock(&em28xx_devlist_mutex);
1308 list_for_each_entry(dev, &em28xx_devlist, devlist) {
1311 list_del(&ops->next);
1312 mutex_unlock(&em28xx_devlist_mutex);
1313 printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
1315 EXPORT_SYMBOL(em28xx_unregister_extension);
1317 void em28xx_init_extension(struct em28xx *dev)
1319 const struct em28xx_ops *ops = NULL;
1321 mutex_lock(&em28xx_devlist_mutex);
1322 list_add_tail(&dev->devlist, &em28xx_devlist);
1323 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1327 mutex_unlock(&em28xx_devlist_mutex);
1330 void em28xx_close_extension(struct em28xx *dev)
1332 const struct em28xx_ops *ops = NULL;
1334 mutex_lock(&em28xx_devlist_mutex);
1335 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1339 list_del(&dev->devlist);
1340 mutex_unlock(&em28xx_devlist_mutex);