Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1172 insertions, 0 deletions

diff --git a/drivers/media/usb/em28xx/em28xx-core.c b/drivers/media/usb/em28xx/em28xx-core.c
new file mode 100644
index 0000000000..61d7bf701d
--- /dev/null
+++ b/drivers/media/usb/em28xx/em28xx-core.c
@@ -0,0 +1,1172 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
+//
+// Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
+//		      Markus Rechberger <mrechberger@gmail.com>
+//		      Mauro Carvalho Chehab <mchehab@kernel.org>
+//		      Sascha Sommer <saschasommer@freenet.de>
+// Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
+
+#include "em28xx.h"
+
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+#include <linux/vmalloc.h>
+#include <sound/ac97_codec.h>
+#include <media/v4l2-common.h>
+
+#define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
+		      "Markus Rechberger <mrechberger@gmail.com>, " \
+		      "Mauro Carvalho Chehab <mchehab@kernel.org>, " \
+		      "Sascha Sommer <saschasommer@freenet.de>"
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(EM28XX_VERSION);
+
+/* #define ENABLE_DEBUG_ISOC_FRAMES */
+
+static unsigned int core_debug;
+module_param(core_debug, int, 0644);
+MODULE_PARM_DESC(core_debug, "enable debug messages [core and isoc]");
+
+#define em28xx_coredbg(fmt, arg...) do {				\
+	if (core_debug)							\
+		dev_printk(KERN_DEBUG, &dev->intf->dev,			\
+			   "core: %s: " fmt, __func__, ## arg);		\
+} while (0)
+
+static unsigned int reg_debug;
+module_param(reg_debug, int, 0644);
+MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]");
+
+#define em28xx_regdbg(fmt, arg...) do {				\
+	if (reg_debug)							\
+		dev_printk(KERN_DEBUG, &dev->intf->dev,			\
+			   "reg: %s: " fmt, __func__, ## arg);		\
+} while (0)
+
+/* FIXME: don't abuse core_debug */
+#define em28xx_isocdbg(fmt, arg...) do {				\
+	if (core_debug)							\
+		dev_printk(KERN_DEBUG, &dev->intf->dev,			\
+			   "core: %s: " fmt, __func__, ## arg);		\
+} while (0)
+
+/*
+ * em28xx_read_reg_req()
+ * reads data from the usb device specifying bRequest
+ */
+int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
+			    char *buf, int len)
+{
+	int ret;
+	struct usb_device *udev = interface_to_usbdev(dev->intf);
+	int pipe = usb_rcvctrlpipe(udev, 0);
+
+	if (dev->disconnected)
+		return -ENODEV;
+
+	if (len > URB_MAX_CTRL_SIZE)
+		return -EINVAL;
+
+	mutex_lock(&dev->ctrl_urb_lock);
+	ret = usb_control_msg(udev, pipe, req,
+			      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			      0x0000, reg, dev->urb_buf, len, 1000);
+	if (ret < 0) {
+		em28xx_regdbg("(pipe 0x%08x): IN:  %02x %02x %02x %02x %02x %02x %02x %02x  failed with error %i\n",
+			      pipe,
+			      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			      req, 0, 0,
+			      reg & 0xff, reg >> 8,
+			      len & 0xff, len >> 8, ret);
+		mutex_unlock(&dev->ctrl_urb_lock);
+		return usb_translate_errors(ret);
+	}
+
+	if (len)
+		memcpy(buf, dev->urb_buf, len);
+
+	mutex_unlock(&dev->ctrl_urb_lock);
+
+	em28xx_regdbg("(pipe 0x%08x): IN:  %02x %02x %02x %02x %02x %02x %02x %02x <<< %*ph\n",
+		      pipe, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		      req, 0, 0,
+		      reg & 0xff, reg >> 8,
+		      len & 0xff, len >> 8, len, buf);
+
+	return ret;
+}
+
+/*
+ * em28xx_read_reg_req()
+ * reads data from the usb device specifying bRequest
+ */
+int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
+{
+	int ret;
+	u8 val;
+
+	ret = em28xx_read_reg_req_len(dev, req, reg, &val, 1);
+	if (ret < 0)
+		return ret;
+
+	return val;
+}
+
+int em28xx_read_reg(struct em28xx *dev, u16 reg)
+{
+	return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
+}
+EXPORT_SYMBOL_GPL(em28xx_read_reg);
+
+/*
+ * em28xx_write_regs_req()
+ * sends data to the usb device, specifying bRequest
+ */
+int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
+			  int len)
+{
+	int ret;
+	struct usb_device *udev = interface_to_usbdev(dev->intf);
+	int pipe = usb_sndctrlpipe(udev, 0);
+
+	if (dev->disconnected)
+		return -ENODEV;
+
+	if (len < 1 || len > URB_MAX_CTRL_SIZE)
+		return -EINVAL;
+
+	mutex_lock(&dev->ctrl_urb_lock);
+	memcpy(dev->urb_buf, buf, len);
+	ret = usb_control_msg(udev, pipe, req,
+			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			      0x0000, reg, dev->urb_buf, len, 1000);
+	mutex_unlock(&dev->ctrl_urb_lock);
+
+	if (ret < 0) {
+		em28xx_regdbg("(pipe 0x%08x): OUT:  %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph  failed with error %i\n",
+			      pipe,
+			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			      req, 0, 0,
+			      reg & 0xff, reg >> 8,
+			      len & 0xff, len >> 8, len, buf, ret);
+		return usb_translate_errors(ret);
+	}
+
+	em28xx_regdbg("(pipe 0x%08x): OUT:  %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph\n",
+		      pipe,
+		      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		      req, 0, 0,
+		      reg & 0xff, reg >> 8,
+		      len & 0xff, len >> 8, len, buf);
+
+	if (dev->wait_after_write)
+		msleep(dev->wait_after_write);
+
+	return ret;
+}
+
+int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
+{
+	return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
+}
+EXPORT_SYMBOL_GPL(em28xx_write_regs);
+
+/* Write a single register */
+int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
+{
+	return em28xx_write_regs(dev, reg, &val, 1);
+}
+EXPORT_SYMBOL_GPL(em28xx_write_reg);
+
+/*
+ * em28xx_write_reg_bits()
+ * sets only some bits (specified by bitmask) of a register, by first reading
+ * the actual value
+ */
+int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
+			  u8 bitmask)
+{
+	int oldval;
+	u8 newval;
+
+	oldval = em28xx_read_reg(dev, reg);
+	if (oldval < 0)
+		return oldval;
+
+	newval = (((u8)oldval) & ~bitmask) | (val & bitmask);
+
+	return em28xx_write_regs(dev, reg, &newval, 1);
+}
+EXPORT_SYMBOL_GPL(em28xx_write_reg_bits);
+
+/*
+ * em28xx_toggle_reg_bits()
+ * toggles/inverts the bits (specified by bitmask) of a register
+ */
+int em28xx_toggle_reg_bits(struct em28xx *dev, u16 reg, u8 bitmask)
+{
+	int oldval;
+	u8 newval;
+
+	oldval = em28xx_read_reg(dev, reg);
+	if (oldval < 0)
+		return oldval;
+
+	newval = (~oldval & bitmask) | (oldval & ~bitmask);
+
+	return em28xx_write_reg(dev, reg, newval);
+}
+EXPORT_SYMBOL_GPL(em28xx_toggle_reg_bits);
+
+/*
+ * em28xx_is_ac97_ready()
+ * Checks if ac97 is ready
+ */
+static int em28xx_is_ac97_ready(struct em28xx *dev)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(EM28XX_AC97_XFER_TIMEOUT);
+	int ret;
+
+	/* Wait up to 50 ms for AC97 command to complete */
+	while (time_is_after_jiffies(timeout)) {
+		ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
+		if (ret < 0)
+			return ret;
+
+		if (!(ret & 0x01))
+			return 0;
+		msleep(5);
+	}
+
+	dev_warn(&dev->intf->dev,
+		 "AC97 command still being executed: not handled properly!\n");
+	return -EBUSY;
+}
+
+/*
+ * em28xx_read_ac97()
+ * write a 16 bit value to the specified AC97 address (LSB first!)
+ */
+int em28xx_read_ac97(struct em28xx *dev, u8 reg)
+{
+	int ret;
+	u8 addr = (reg & 0x7f) | 0x80;
+	__le16 val;
+
+	ret = em28xx_is_ac97_ready(dev);
+	if (ret < 0)
+		return ret;
+
+	ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
+	if (ret < 0)
+		return ret;
+
+	ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
+					   (u8 *)&val, sizeof(val));
+
+	if (ret < 0)
+		return ret;
+	return le16_to_cpu(val);
+}
+EXPORT_SYMBOL_GPL(em28xx_read_ac97);
+
+/*
+ * em28xx_write_ac97()
+ * write a 16 bit value to the specified AC97 address (LSB first!)
+ */
+int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
+{
+	int ret;
+	u8 addr = reg & 0x7f;
+	__le16 value;
+
+	value = cpu_to_le16(val);
+
+	ret = em28xx_is_ac97_ready(dev);
+	if (ret < 0)
+		return ret;
+
+	ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *)&value, 2);
+	if (ret < 0)
+		return ret;
+
+	ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(em28xx_write_ac97);
+
+struct em28xx_vol_itable {
+	enum em28xx_amux mux;
+	u8		 reg;
+};
+
+static struct em28xx_vol_itable inputs[] = {
+	{ EM28XX_AMUX_VIDEO,	AC97_VIDEO	},
+	{ EM28XX_AMUX_LINE_IN,	AC97_LINE	},
+	{ EM28XX_AMUX_PHONE,	AC97_PHONE	},
+	{ EM28XX_AMUX_MIC,	AC97_MIC	},
+	{ EM28XX_AMUX_CD,	AC97_CD		},
+	{ EM28XX_AMUX_AUX,	AC97_AUX	},
+	{ EM28XX_AMUX_PCM_OUT,	AC97_PCM	},
+};
+
+static int set_ac97_input(struct em28xx *dev)
+{
+	int ret, i;
+	enum em28xx_amux amux = dev->ctl_ainput;
+
+	/*
+	 * EM28XX_AMUX_VIDEO2 is a special case used to indicate that
+	 * em28xx should point to LINE IN, while AC97 should use VIDEO
+	 */
+	if (amux == EM28XX_AMUX_VIDEO2)
+		amux = EM28XX_AMUX_VIDEO;
+
+	/* Mute all entres but the one that were selected */
+	for (i = 0; i < ARRAY_SIZE(inputs); i++) {
+		if (amux == inputs[i].mux)
+			ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
+		else
+			ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
+
+		if (ret < 0)
+			dev_warn(&dev->intf->dev,
+				 "couldn't setup AC97 register %d\n",
+				 inputs[i].reg);
+	}
+	return 0;
+}
+
+static int em28xx_set_audio_source(struct em28xx *dev)
+{
+	int ret;
+	u8 input;
+
+	if (dev->board.is_em2800) {
+		if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
+			input = EM2800_AUDIO_SRC_TUNER;
+		else
+			input = EM2800_AUDIO_SRC_LINE;
+
+		ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
+		if (ret < 0)
+			return ret;
+	}
+
+	if (dev->has_msp34xx) {
+		input = EM28XX_AUDIO_SRC_TUNER;
+	} else {
+		switch (dev->ctl_ainput) {
+		case EM28XX_AMUX_VIDEO:
+			input = EM28XX_AUDIO_SRC_TUNER;
+			break;
+		default:
+			input = EM28XX_AUDIO_SRC_LINE;
+			break;
+		}
+	}
+
+	if (dev->board.mute_gpio && dev->mute)
+		em28xx_gpio_set(dev, dev->board.mute_gpio);
+	else
+		em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
+
+	ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
+	if (ret < 0)
+		return ret;
+	usleep_range(10000, 11000);
+
+	switch (dev->audio_mode.ac97) {
+	case EM28XX_NO_AC97:
+		break;
+	default:
+		ret = set_ac97_input(dev);
+	}
+
+	return ret;
+}
+
+struct em28xx_vol_otable {
+	enum em28xx_aout mux;
+	u8		 reg;
+};
+
+static const struct em28xx_vol_otable outputs[] = {
+	{ EM28XX_AOUT_MASTER, AC97_MASTER		},
+	{ EM28XX_AOUT_LINE,   AC97_HEADPHONE		},
+	{ EM28XX_AOUT_MONO,   AC97_MASTER_MONO		},
+	{ EM28XX_AOUT_LFE,    AC97_CENTER_LFE_MASTER	},
+	{ EM28XX_AOUT_SURR,   AC97_SURROUND_MASTER	},
+};
+
+int em28xx_audio_analog_set(struct em28xx *dev)
+{
+	int ret, i;
+	u8 xclk;
+
+	if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE)
+		return 0;
+
+	/*
+	 * It is assumed that all devices use master volume for output.
+	 * It would be possible to use also line output.
+	 */
+	if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
+		/* Mute all outputs */
+		for (i = 0; i < ARRAY_SIZE(outputs); i++) {
+			ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
+			if (ret < 0)
+				dev_warn(&dev->intf->dev,
+					 "couldn't setup AC97 register %d\n",
+					 outputs[i].reg);
+		}
+	}
+
+	xclk = dev->board.xclk & 0x7f;
+	if (!dev->mute)
+		xclk |= EM28XX_XCLK_AUDIO_UNMUTE;
+
+	ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
+	if (ret < 0)
+		return ret;
+	usleep_range(10000, 11000);
+
+	/* Selects the proper audio input */
+	ret = em28xx_set_audio_source(dev);
+
+	/* Sets volume */
+	if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
+		int vol;
+
+		em28xx_write_ac97(dev, AC97_POWERDOWN, 0x4200);
+		em28xx_write_ac97(dev, AC97_EXTENDED_STATUS, 0x0031);
+		em28xx_write_ac97(dev, AC97_PCM_LR_ADC_RATE, 0xbb80);
+
+		/* LSB: left channel - both channels with the same level */
+		vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
+
+		/* Mute device, if needed */
+		if (dev->mute)
+			vol |= 0x8000;
+
+		/* Sets volume */
+		for (i = 0; i < ARRAY_SIZE(outputs); i++) {
+			if (dev->ctl_aoutput & outputs[i].mux)
+				ret = em28xx_write_ac97(dev, outputs[i].reg,
+							vol);
+			if (ret < 0)
+				dev_warn(&dev->intf->dev,
+					 "couldn't setup AC97 register %d\n",
+					 outputs[i].reg);
+		}
+
+		if (dev->ctl_aoutput & EM28XX_AOUT_PCM_IN) {
+			int sel = ac97_return_record_select(dev->ctl_aoutput);
+
+			/*
+			 * Use the same input for both left and right
+			 * channels
+			 */
+			sel |= (sel << 8);
+
+			em28xx_write_ac97(dev, AC97_REC_SEL, sel);
+		}
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
+
+int em28xx_audio_setup(struct em28xx *dev)
+{
+	int vid1, vid2, feat, cfg;
+	u32 vid = 0;
+	u8 i2s_samplerates;
+
+	if (dev->chip_id == CHIP_ID_EM2870 ||
+	    dev->chip_id == CHIP_ID_EM2874 ||
+	    dev->chip_id == CHIP_ID_EM28174 ||
+	    dev->chip_id == CHIP_ID_EM28178) {
+		/* Digital only device - don't load any alsa module */
+		dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
+		dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
+		return 0;
+	}
+
+	/* See how this device is configured */
+	cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
+	dev_info(&dev->intf->dev, "Config register raw data: 0x%02x\n", cfg);
+	if (cfg < 0) { /* Register read error */
+		/* Be conservative */
+		dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
+	} else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
+		/* The device doesn't have vendor audio at all */
+		dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
+		dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
+		return 0;
+	} else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
+		dev->int_audio_type = EM28XX_INT_AUDIO_I2S;
+		if (dev->chip_id < CHIP_ID_EM2860 &&
+		    (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
+		    EM2820_CHIPCFG_I2S_1_SAMPRATE)
+			i2s_samplerates = 1;
+		else if (dev->chip_id >= CHIP_ID_EM2860 &&
+			 (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
+			 EM2860_CHIPCFG_I2S_5_SAMPRATES)
+			i2s_samplerates = 5;
+		else
+			i2s_samplerates = 3;
+		dev_info(&dev->intf->dev, "I2S Audio (%d sample rate(s))\n",
+			 i2s_samplerates);
+		/* Skip the code that does AC97 vendor detection */
+		dev->audio_mode.ac97 = EM28XX_NO_AC97;
+		goto init_audio;
+	} else {
+		dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
+	}
+
+	dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
+
+	vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
+	if (vid1 < 0) {
+		/*
+		 * Device likely doesn't support AC97
+		 * Note: (some) em2800 devices without eeprom reports 0x91 on
+		 *	 CHIPCFG register, even not having an AC97 chip
+		 */
+		dev_warn(&dev->intf->dev,
+			 "AC97 chip type couldn't be determined\n");
+		dev->audio_mode.ac97 = EM28XX_NO_AC97;
+		if (dev->usb_audio_type == EM28XX_USB_AUDIO_VENDOR)
+			dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
+		dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
+		goto init_audio;
+	}
+
+	vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
+	if (vid2 < 0)
+		goto init_audio;
+
+	vid = vid1 << 16 | vid2;
+	dev_warn(&dev->intf->dev, "AC97 vendor ID = 0x%08x\n", vid);
+
+	feat = em28xx_read_ac97(dev, AC97_RESET);
+	if (feat < 0)
+		goto init_audio;
+
+	dev_warn(&dev->intf->dev, "AC97 features = 0x%04x\n", feat);
+
+	/* Try to identify what audio processor we have */
+	if ((vid == 0xffffffff || vid == 0x83847650) && feat == 0x6a90)
+		dev->audio_mode.ac97 = EM28XX_AC97_EM202;
+	else if ((vid >> 8) == 0x838476)
+		dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
+
+init_audio:
+	/* Reports detected AC97 processor */
+	switch (dev->audio_mode.ac97) {
+	case EM28XX_NO_AC97:
+		dev_info(&dev->intf->dev, "No AC97 audio processor\n");
+		break;
+	case EM28XX_AC97_EM202:
+		dev_info(&dev->intf->dev,
+			 "Empia 202 AC97 audio processor detected\n");
+		break;
+	case EM28XX_AC97_SIGMATEL:
+		dev_info(&dev->intf->dev,
+			 "Sigmatel audio processor detected (stac 97%02x)\n",
+			 vid & 0xff);
+		break;
+	case EM28XX_AC97_OTHER:
+		dev_warn(&dev->intf->dev,
+			 "Unknown AC97 audio processor detected!\n");
+		break;
+	default:
+		break;
+	}
+
+	return em28xx_audio_analog_set(dev);
+}
+EXPORT_SYMBOL_GPL(em28xx_audio_setup);
+
+const struct em28xx_led *em28xx_find_led(struct em28xx *dev,
+					 enum em28xx_led_role role)
+{
+	if (dev->board.leds) {
+		u8 k = 0;
+
+		while (dev->board.leds[k].role >= 0 &&
+		       dev->board.leds[k].role < EM28XX_NUM_LED_ROLES) {
+			if (dev->board.leds[k].role == role)
+				return &dev->board.leds[k];
+			k++;
+		}
+	}
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(em28xx_find_led);
+
+int em28xx_capture_start(struct em28xx *dev, int start)
+{
+	int rc;
+	const struct em28xx_led *led = NULL;
+
+	if (dev->chip_id == CHIP_ID_EM2874 ||
+	    dev->chip_id == CHIP_ID_EM2884 ||
+	    dev->chip_id == CHIP_ID_EM28174 ||
+	    dev->chip_id == CHIP_ID_EM28178) {
+		/* The Transport Stream Enable Register moved in em2874 */
+		if (dev->dvb_xfer_bulk) {
+			/* Max Tx Size = 188 * 256 = 48128 - LCM(188,512) * 2 */
+			em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ?
+					 EM2874_R5D_TS1_PKT_SIZE :
+					 EM2874_R5E_TS2_PKT_SIZE,
+					 0xff);
+		} else {
+			/* ISOC Maximum Transfer Size = 188 * 5 */
+			em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ?
+					 EM2874_R5D_TS1_PKT_SIZE :
+					 EM2874_R5E_TS2_PKT_SIZE,
+					 dev->dvb_max_pkt_size_isoc / 188);
+		}
+		if (dev->ts == PRIMARY_TS)
+			rc = em28xx_write_reg_bits(dev,
+						   EM2874_R5F_TS_ENABLE,
+						   start ? EM2874_TS1_CAPTURE_ENABLE : 0x00,
+						   EM2874_TS1_CAPTURE_ENABLE | EM2874_TS1_FILTER_ENABLE | EM2874_TS1_NULL_DISCARD);
+		else
+			rc = em28xx_write_reg_bits(dev,
+						   EM2874_R5F_TS_ENABLE,
+						   start ? EM2874_TS2_CAPTURE_ENABLE : 0x00,
+						   EM2874_TS2_CAPTURE_ENABLE | EM2874_TS2_FILTER_ENABLE | EM2874_TS2_NULL_DISCARD);
+	} else {
+		/* FIXME: which is the best order? */
+		/* video registers are sampled by VREF */
+		rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
+					   start ? 0x10 : 0x00, 0x10);
+		if (rc < 0)
+			return rc;
+
+		if (start) {
+			if (dev->is_webcam)
+				rc = em28xx_write_reg(dev, 0x13, 0x0c);
+
+			/* Enable video capture */
+			rc = em28xx_write_reg(dev, 0x48, 0x00);
+			if (rc < 0)
+				return rc;
+
+			if (dev->mode == EM28XX_ANALOG_MODE)
+				rc = em28xx_write_reg(dev,
+						      EM28XX_R12_VINENABLE,
+						      0x67);
+			else
+				rc = em28xx_write_reg(dev,
+						      EM28XX_R12_VINENABLE,
+						      0x37);
+			if (rc < 0)
+				return rc;
+
+			usleep_range(10000, 11000);
+		} else {
+			/* disable video capture */
+			rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
+		}
+	}
+
+	if (dev->mode == EM28XX_ANALOG_MODE)
+		led = em28xx_find_led(dev, EM28XX_LED_ANALOG_CAPTURING);
+	else if (dev->ts == PRIMARY_TS)
+		led = em28xx_find_led(dev, EM28XX_LED_DIGITAL_CAPTURING);
+	else
+		led = em28xx_find_led(dev, EM28XX_LED_DIGITAL_CAPTURING_TS2);
+
+	if (led)
+		em28xx_write_reg_bits(dev, led->gpio_reg,
+				      (!start ^ led->inverted) ?
+				      ~led->gpio_mask : led->gpio_mask,
+				      led->gpio_mask);
+
+	return rc;
+}
+
+int em28xx_gpio_set(struct em28xx *dev, const struct em28xx_reg_seq *gpio)
+{
+	int rc = 0;
+
+	if (!gpio)
+		return rc;
+
+	if (dev->mode != EM28XX_SUSPEND) {
+		em28xx_write_reg(dev, 0x48, 0x00);
+		if (dev->mode == EM28XX_ANALOG_MODE)
+			em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
+		else
+			em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
+		usleep_range(10000, 11000);
+	}
+
+	/* Send GPIO reset sequences specified at board entry */
+	while (gpio->sleep >= 0) {
+		if (gpio->reg >= 0) {
+			rc = em28xx_write_reg_bits(dev,
+						   gpio->reg,
+						   gpio->val,
+						   gpio->mask);
+			if (rc < 0)
+				return rc;
+		}
+		if (gpio->sleep > 0)
+			msleep(gpio->sleep);
+
+		gpio++;
+	}
+	return rc;
+}
+EXPORT_SYMBOL_GPL(em28xx_gpio_set);
+
+int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
+{
+	if (dev->mode == set_mode)
+		return 0;
+
+	if (set_mode == EM28XX_SUSPEND) {
+		dev->mode = set_mode;
+
+		/* FIXME: add suspend support for ac97 */
+
+		return em28xx_gpio_set(dev, dev->board.suspend_gpio);
+	}
+
+	dev->mode = set_mode;
+
+	if (dev->mode == EM28XX_DIGITAL_MODE)
+		return em28xx_gpio_set(dev, dev->board.dvb_gpio);
+	else
+		return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
+}
+EXPORT_SYMBOL_GPL(em28xx_set_mode);
+
+/*
+ *URB control
+ */
+
+/*
+ * URB completion handler for isoc/bulk transfers
+ */
+static void em28xx_irq_callback(struct urb *urb)
+{
+	struct em28xx *dev = urb->context;
+	unsigned long flags;
+	int i;
+
+	switch (urb->status) {
+	case 0:             /* success */
+	case -ETIMEDOUT:    /* NAK */
+		break;
+	case -ECONNRESET:   /* kill */
+	case -ENOENT:
+	case -ESHUTDOWN:
+		return;
+	default:            /* error */
+		em28xx_isocdbg("urb completion error %d.\n", urb->status);
+		break;
+	}
+
+	/* Copy data from URB */
+	spin_lock_irqsave(&dev->slock, flags);
+	dev->usb_ctl.urb_data_copy(dev, urb);
+	spin_unlock_irqrestore(&dev->slock, flags);
+
+	/* Reset urb buffers */
+	for (i = 0; i < urb->number_of_packets; i++) {
+		/* isoc only (bulk: number_of_packets = 0) */
+		urb->iso_frame_desc[i].status = 0;
+		urb->iso_frame_desc[i].actual_length = 0;
+	}
+	urb->status = 0;
+
+	urb->status = usb_submit_urb(urb, GFP_ATOMIC);
+	if (urb->status) {
+		em28xx_isocdbg("urb resubmit failed (error=%i)\n",
+			       urb->status);
+	}
+}
+
+/*
+ * Stop and Deallocate URBs
+ */
+void em28xx_uninit_usb_xfer(struct em28xx *dev, enum em28xx_mode mode)
+{
+	struct urb *urb;
+	struct em28xx_usb_bufs *usb_bufs;
+	int i;
+
+	em28xx_isocdbg("called %s in mode %d\n", __func__, mode);
+
+	if (mode == EM28XX_DIGITAL_MODE)
+		usb_bufs = &dev->usb_ctl.digital_bufs;
+	else
+		usb_bufs = &dev->usb_ctl.analog_bufs;
+
+	for (i = 0; i < usb_bufs->num_bufs; i++) {
+		urb = usb_bufs->urb[i];
+		if (urb) {
+			if (!irqs_disabled())
+				usb_kill_urb(urb);
+			else
+				usb_unlink_urb(urb);
+
+			usb_free_urb(urb);
+			usb_bufs->urb[i] = NULL;
+		}
+	}
+
+	kfree(usb_bufs->urb);
+	kfree(usb_bufs->buf);
+
+	usb_bufs->urb = NULL;
+	usb_bufs->buf = NULL;
+	usb_bufs->num_bufs = 0;
+
+	em28xx_capture_start(dev, 0);
+}
+EXPORT_SYMBOL_GPL(em28xx_uninit_usb_xfer);
+
+/*
+ * Stop URBs
+ */
+void em28xx_stop_urbs(struct em28xx *dev)
+{
+	int i;
+	struct urb *urb;
+	struct em28xx_usb_bufs *isoc_bufs = &dev->usb_ctl.digital_bufs;
+
+	em28xx_isocdbg("called %s\n", __func__);
+
+	for (i = 0; i < isoc_bufs->num_bufs; i++) {
+		urb = isoc_bufs->urb[i];
+		if (urb) {
+			if (!irqs_disabled())
+				usb_kill_urb(urb);
+			else
+				usb_unlink_urb(urb);
+		}
+	}
+
+	em28xx_capture_start(dev, 0);
+}
+EXPORT_SYMBOL_GPL(em28xx_stop_urbs);
+
+/*
+ * Allocate URBs
+ */
+int em28xx_alloc_urbs(struct em28xx *dev, enum em28xx_mode mode, int xfer_bulk,
+		      int num_bufs, int max_pkt_size, int packet_multiplier)
+{
+	struct em28xx_usb_bufs *usb_bufs;
+	struct urb *urb;
+	struct usb_device *udev = interface_to_usbdev(dev->intf);
+	int i;
+	int sb_size, pipe;
+	int j, k;
+
+	em28xx_isocdbg("em28xx: called %s in mode %d\n", __func__, mode);
+
+	/*
+	 * Check mode and if we have an endpoint for the selected
+	 * transfer type, select buffer
+	 */
+	if (mode == EM28XX_DIGITAL_MODE) {
+		if ((xfer_bulk && !dev->dvb_ep_bulk) ||
+		    (!xfer_bulk && !dev->dvb_ep_isoc)) {
+			dev_err(&dev->intf->dev,
+				"no endpoint for DVB mode and transfer type %d\n",
+				xfer_bulk > 0);
+			return -EINVAL;
+		}
+		usb_bufs = &dev->usb_ctl.digital_bufs;
+	} else if (mode == EM28XX_ANALOG_MODE) {
+		if ((xfer_bulk && !dev->analog_ep_bulk) ||
+		    (!xfer_bulk && !dev->analog_ep_isoc)) {
+			dev_err(&dev->intf->dev,
+				"no endpoint for analog mode and transfer type %d\n",
+				xfer_bulk > 0);
+			return -EINVAL;
+		}
+		usb_bufs = &dev->usb_ctl.analog_bufs;
+	} else {
+		dev_err(&dev->intf->dev, "invalid mode selected\n");
+		return -EINVAL;
+	}
+
+	/* De-allocates all pending stuff */
+	em28xx_uninit_usb_xfer(dev, mode);
+
+	usb_bufs->num_bufs = num_bufs;
+
+	usb_bufs->urb = kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
+	if (!usb_bufs->urb)
+		return -ENOMEM;
+
+	usb_bufs->buf = kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
+	if (!usb_bufs->buf) {
+		kfree(usb_bufs->urb);
+		return -ENOMEM;
+	}
+
+	usb_bufs->max_pkt_size = max_pkt_size;
+	if (xfer_bulk)
+		usb_bufs->num_packets = 0;
+	else
+		usb_bufs->num_packets = packet_multiplier;
+	dev->usb_ctl.vid_buf = NULL;
+	dev->usb_ctl.vbi_buf = NULL;
+
+	sb_size = packet_multiplier * usb_bufs->max_pkt_size;
+
+	/* allocate urbs and transfer buffers */
+	for (i = 0; i < usb_bufs->num_bufs; i++) {
+		urb = usb_alloc_urb(usb_bufs->num_packets, GFP_KERNEL);
+		if (!urb) {
+			em28xx_uninit_usb_xfer(dev, mode);
+			return -ENOMEM;
+		}
+		usb_bufs->urb[i] = urb;
+
+		usb_bufs->buf[i] = kzalloc(sb_size, GFP_KERNEL);
+		if (!usb_bufs->buf[i]) {
+			for (i--; i >= 0; i--)
+				kfree(usb_bufs->buf[i]);
+
+			em28xx_uninit_usb_xfer(dev, mode);
+			return -ENOMEM;
+		}
+
+		urb->transfer_flags = URB_FREE_BUFFER;
+
+		if (xfer_bulk) { /* bulk */
+			pipe = usb_rcvbulkpipe(udev,
+					       mode == EM28XX_ANALOG_MODE ?
+					       dev->analog_ep_bulk :
+					       dev->dvb_ep_bulk);
+			usb_fill_bulk_urb(urb, udev, pipe, usb_bufs->buf[i],
+					  sb_size, em28xx_irq_callback, dev);
+		} else { /* isoc */
+			pipe = usb_rcvisocpipe(udev,
+					       mode == EM28XX_ANALOG_MODE ?
+					       dev->analog_ep_isoc :
+					       dev->dvb_ep_isoc);
+			usb_fill_int_urb(urb, udev, pipe, usb_bufs->buf[i],
+					 sb_size, em28xx_irq_callback, dev, 1);
+			urb->transfer_flags |= URB_ISO_ASAP;
+			k = 0;
+			for (j = 0; j < usb_bufs->num_packets; j++) {
+				urb->iso_frame_desc[j].offset = k;
+				urb->iso_frame_desc[j].length =
+							usb_bufs->max_pkt_size;
+				k += usb_bufs->max_pkt_size;
+			}
+		}
+
+		urb->number_of_packets = usb_bufs->num_packets;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(em28xx_alloc_urbs);
+
+/*
+ * Allocate URBs and start IRQ
+ */
+int em28xx_init_usb_xfer(struct em28xx *dev, enum em28xx_mode mode,
+			 int xfer_bulk, int num_bufs, int max_pkt_size,
+		    int packet_multiplier,
+		    int (*urb_data_copy)(struct em28xx *dev, struct urb *urb))
+{
+	struct em28xx_dmaqueue *dma_q = &dev->vidq;
+	struct em28xx_dmaqueue *vbi_dma_q = &dev->vbiq;
+	struct em28xx_usb_bufs *usb_bufs;
+	struct usb_device *udev = interface_to_usbdev(dev->intf);
+	int i;
+	int rc;
+	int alloc;
+
+	em28xx_isocdbg("em28xx: called %s in mode %d\n", __func__, mode);
+
+	dev->usb_ctl.urb_data_copy = urb_data_copy;
+
+	if (mode == EM28XX_DIGITAL_MODE) {
+		usb_bufs = &dev->usb_ctl.digital_bufs;
+		/* no need to free/alloc usb buffers in digital mode */
+		alloc = 0;
+	} else {
+		usb_bufs = &dev->usb_ctl.analog_bufs;
+		alloc = 1;
+	}
+
+	if (alloc) {
+		rc = em28xx_alloc_urbs(dev, mode, xfer_bulk, num_bufs,
+				       max_pkt_size, packet_multiplier);
+		if (rc)
+			return rc;
+	}
+
+	if (xfer_bulk) {
+		rc = usb_clear_halt(udev, usb_bufs->urb[0]->pipe);
+		if (rc < 0) {
+			dev_err(&dev->intf->dev,
+				"failed to clear USB bulk endpoint stall/halt condition (error=%i)\n",
+			       rc);
+			em28xx_uninit_usb_xfer(dev, mode);
+			return rc;
+		}
+	}
+
+	init_waitqueue_head(&dma_q->wq);
+	init_waitqueue_head(&vbi_dma_q->wq);
+
+	em28xx_capture_start(dev, 1);
+
+	/* submit urbs and enables IRQ */
+	for (i = 0; i < usb_bufs->num_bufs; i++) {
+		rc = usb_submit_urb(usb_bufs->urb[i], GFP_KERNEL);
+		if (rc) {
+			dev_err(&dev->intf->dev,
+				"submit of urb %i failed (error=%i)\n", i, rc);
+			em28xx_uninit_usb_xfer(dev, mode);
+			return rc;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(em28xx_init_usb_xfer);
+
+/*
+ * Device control list
+ */
+
+static LIST_HEAD(em28xx_devlist);
+static DEFINE_MUTEX(em28xx_devlist_mutex);
+
+/*
+ * Extension interface
+ */
+
+static LIST_HEAD(em28xx_extension_devlist);
+
+int em28xx_register_extension(struct em28xx_ops *ops)
+{
+	struct em28xx *dev = NULL;
+
+	mutex_lock(&em28xx_devlist_mutex);
+	list_add_tail(&ops->next, &em28xx_extension_devlist);
+	list_for_each_entry(dev, &em28xx_devlist, devlist) {
+		if (ops->init) {
+			ops->init(dev);
+			if (dev->dev_next)
+				ops->init(dev->dev_next);
+		}
+	}
+	mutex_unlock(&em28xx_devlist_mutex);
+	pr_info("em28xx: Registered (%s) extension\n", ops->name);
+	return 0;
+}
+EXPORT_SYMBOL(em28xx_register_extension);
+
+void em28xx_unregister_extension(struct em28xx_ops *ops)
+{
+	struct em28xx *dev = NULL;
+
+	mutex_lock(&em28xx_devlist_mutex);
+	list_for_each_entry(dev, &em28xx_devlist, devlist) {
+		if (ops->fini) {
+			if (dev->dev_next)
+				ops->fini(dev->dev_next);
+			ops->fini(dev);
+		}
+	}
+	list_del(&ops->next);
+	mutex_unlock(&em28xx_devlist_mutex);
+	pr_info("em28xx: Removed (%s) extension\n", ops->name);
+}
+EXPORT_SYMBOL(em28xx_unregister_extension);
+
+void em28xx_init_extension(struct em28xx *dev)
+{
+	const struct em28xx_ops *ops = NULL;
+
+	mutex_lock(&em28xx_devlist_mutex);
+	list_add_tail(&dev->devlist, &em28xx_devlist);
+	list_for_each_entry(ops, &em28xx_extension_devlist, next) {
+		if (ops->init) {
+			ops->init(dev);
+			if (dev->dev_next)
+				ops->init(dev->dev_next);
+		}
+	}
+	mutex_unlock(&em28xx_devlist_mutex);
+}
+
+void em28xx_close_extension(struct em28xx *dev)
+{
+	const struct em28xx_ops *ops = NULL;
+
+	mutex_lock(&em28xx_devlist_mutex);
+	list_for_each_entry(ops, &em28xx_extension_devlist, next) {
+		if (ops->fini) {
+			if (dev->dev_next)
+				ops->fini(dev->dev_next);
+			ops->fini(dev);
+		}
+	}
+	list_del(&dev->devlist);
+	mutex_unlock(&em28xx_devlist_mutex);
+}
+
+int em28xx_suspend_extension(struct em28xx *dev)
+{
+	const struct em28xx_ops *ops = NULL;
+
+	dev_info(&dev->intf->dev, "Suspending extensions\n");
+	mutex_lock(&em28xx_devlist_mutex);
+	list_for_each_entry(ops, &em28xx_extension_devlist, next) {
+		if (!ops->suspend)
+			continue;
+		ops->suspend(dev);
+		if (dev->dev_next)
+			ops->suspend(dev->dev_next);
+	}
+	mutex_unlock(&em28xx_devlist_mutex);
+	return 0;
+}
+
+int em28xx_resume_extension(struct em28xx *dev)
+{
+	const struct em28xx_ops *ops = NULL;
+
+	dev_info(&dev->intf->dev, "Resuming extensions\n");
+	mutex_lock(&em28xx_devlist_mutex);
+	list_for_each_entry(ops, &em28xx_extension_devlist, next) {
+		if (!ops->resume)
+			continue;
+		ops->resume(dev);
+		if (dev->dev_next)
+			ops->resume(dev->dev_next);
+	}
+	mutex_unlock(&em28xx_devlist_mutex);
+	return 0;
+}