[media] media: Add stk1160 new driver (easycap replacement)

This driver adds support for stk1160 usb bridge as used in some
video/audio usb capture devices.
It is a complete rewrite of staging/media/easycap driver and
it's meant as a replacement.

As stk1160 allows communication with an ac97 codec chip, this
driver allows to register a control-only sound card to allow the user
to access ac97 controls.

Two devices have been used for testing:
* 1-cvbs video and 1-audio ac97 input,
* 4-cvbs inputs
Both of these devices reports with the same id [05e1:0408],
so the driver tries to support a superset of the capabilities.

By using keep_buffers module parameter it's possible to prevent
the driver from releasing urb buffers when streaming is stopped.
The usage of this parameter can avoid memory fragmentation that may
cause the driver to stop working on low memory systems.
A similar mechanism is implemented in em28xx driver (see commit 86d38d).

Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

11 files changed, 2470 insertions, 0 deletions

diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index d5df1fdebf2..966954de599 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -748,6 +748,8 @@ source "drivers/media/video/tm6000/Kconfig"
 
 source "drivers/media/video/usbvision/Kconfig"
 
+source "drivers/media/video/stk1160/Kconfig"
+
 endif # V4L_USB_DRIVERS
 
 #
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index b7ada61f08b..12cad120614 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -126,6 +126,7 @@ obj-$(CONFIG_VIDEO_HEXIUM_ORION) += hexium_orion.o
 obj-$(CONFIG_VIDEO_HEXIUM_GEMINI) += hexium_gemini.o
 obj-$(CONFIG_STA2X11_VIP) += sta2x11_vip.o
 obj-$(CONFIG_VIDEO_TIMBERDALE)	+= timblogiw.o
+obj-$(CONFIG_VIDEO_STK1160) += stk1160/
 
 obj-$(CONFIG_VIDEOBUF_GEN) += videobuf-core.o
 obj-$(CONFIG_VIDEOBUF_DMA_SG) += videobuf-dma-sg.o
diff --git a/drivers/media/video/stk1160/Kconfig b/drivers/media/video/stk1160/Kconfig
new file mode 100644
index 00000000000..1c3a1ec0023
--- /dev/null
+++ b/drivers/media/video/stk1160/Kconfig
@@ -0,0 +1,20 @@
+config VIDEO_STK1160
+	tristate "STK1160 USB video capture support"
+	depends on VIDEO_DEV && I2C
+	select VIDEOBUF2_VMALLOC
+	select VIDEO_SAA711X
+
+	---help---
+	  This is a video4linux driver for STK1160 based video capture devices.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called stk1160
+
+config VIDEO_STK1160_AC97
+	bool "STK1160 AC97 codec support"
+	depends on VIDEO_STK1160 && SND
+	select SND_AC97_CODEC
+
+	---help---
+	  Enables AC97 codec support for stk1160 driver.
+.
diff --git a/drivers/media/video/stk1160/Makefile b/drivers/media/video/stk1160/Makefile
new file mode 100644
index 00000000000..8a3c78482e7
--- /dev/null
+++ b/drivers/media/video/stk1160/Makefile
@@ -0,0 +1,11 @@
+obj-stk1160-ac97-$(CONFIG_VIDEO_STK1160_AC97) := stk1160-ac97.o
+
+stk1160-y := 	stk1160-core.o \
+		stk1160-v4l.o \
+		stk1160-video.o \
+		stk1160-i2c.o \
+		$(obj-stk1160-ac97-y)
+
+obj-$(CONFIG_VIDEO_STK1160) += stk1160.o
+
+ccflags-y += -Idrivers/media/video
diff --git a/drivers/media/video/stk1160/stk1160-ac97.c b/drivers/media/video/stk1160/stk1160-ac97.c
new file mode 100644
index 00000000000..8d325f50c87
--- /dev/null
+++ b/drivers/media/video/stk1160/stk1160-ac97.c
@@ -0,0 +1,153 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ *	Copyright (C) 2010 R.M. Thomas
+ *	<rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/ac97_codec.h>
+
+#include "stk1160.h"
+#include "stk1160-reg.h"
+
+static struct snd_ac97 *stk1160_ac97;
+
+static void stk1160_write_ac97(struct snd_ac97 *ac97, u16 reg, u16 value)
+{
+	struct stk1160 *dev = ac97->private_data;
+
+	/* Set codec register address */
+	stk1160_write_reg(dev, STK1160_AC97_ADDR, reg);
+
+	/* Set codec command */
+	stk1160_write_reg(dev, STK1160_AC97_CMD, value & 0xff);
+	stk1160_write_reg(dev, STK1160_AC97_CMD + 1, (value & 0xff00) >> 8);
+
+	/*
+	 * Set command write bit to initiate write operation.
+	 * The bit will be cleared when transfer is done.
+	 */
+	stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8c);
+}
+
+static u16 stk1160_read_ac97(struct snd_ac97 *ac97, u16 reg)
+{
+	struct stk1160 *dev = ac97->private_data;
+	u8 vall = 0;
+	u8 valh = 0;
+
+	/* Set codec register address */
+	stk1160_write_reg(dev, STK1160_AC97_ADDR, reg);
+
+	/*
+	 * Set command read bit to initiate read operation.
+	 * The bit will be cleared when transfer is done.
+	 */
+	stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8b);
+
+	/* Retrieve register value */
+	stk1160_read_reg(dev, STK1160_AC97_CMD, &vall);
+	stk1160_read_reg(dev, STK1160_AC97_CMD + 1, &valh);
+
+	return (valh << 8) | vall;
+}
+
+static void stk1160_reset_ac97(struct snd_ac97 *ac97)
+{
+	struct stk1160 *dev = ac97->private_data;
+	/* Two-step reset AC97 interface and hardware codec */
+	stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x94);
+	stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x88);
+
+	/* Set 16-bit audio data and choose L&R channel*/
+	stk1160_write_reg(dev, STK1160_AC97CTL_1 + 2, 0x01);
+}
+
+static struct snd_ac97_bus_ops stk1160_ac97_ops = {
+	.read	= stk1160_read_ac97,
+	.write	= stk1160_write_ac97,
+	.reset	= stk1160_reset_ac97,
+};
+
+int stk1160_ac97_register(struct stk1160 *dev)
+{
+	struct snd_card *card = NULL;
+	struct snd_ac97_bus *ac97_bus;
+	struct snd_ac97_template ac97_template;
+	int rc;
+
+	/*
+	 * Just want a card to access ac96 controls,
+	 * the actual capture interface will be handled by snd-usb-audio
+	 */
+	rc = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
+			      THIS_MODULE, 0, &card);
+	if (rc < 0)
+		return rc;
+
+	snd_card_set_dev(card, dev->dev);
+
+	/* TODO: I'm not sure where should I get these names :-( */
+	snprintf(card->shortname, sizeof(card->shortname),
+		 "stk1160-mixer");
+	snprintf(card->longname, sizeof(card->longname),
+		 "stk1160 ac97 codec mixer control");
+	strncpy(card->driver, dev->dev->driver->name, sizeof(card->driver));
+
+	rc = snd_ac97_bus(card, 0, &stk1160_ac97_ops, NULL, &ac97_bus);
+	if (rc)
+		goto err;
+
+	/* We must set private_data before calling snd_ac97_mixer */
+	memset(&ac97_template, 0, sizeof(ac97_template));
+	ac97_template.private_data = dev;
+	ac97_template.scaps = AC97_SCAP_SKIP_MODEM;
+	rc = snd_ac97_mixer(ac97_bus, &ac97_template, &stk1160_ac97);
+	if (rc)
+		goto err;
+
+	dev->snd_card = card;
+	rc = snd_card_register(card);
+	if (rc)
+		goto err;
+
+	return 0;
+
+err:
+	dev->snd_card = NULL;
+	if (card)
+		snd_card_free(card);
+	return rc;
+}
+
+int stk1160_ac97_unregister(struct stk1160 *dev)
+{
+	struct snd_card *card = dev->snd_card;
+
+	/*
+	 * We need to check usb_device,
+	 * because ac97 release attempts to communicate with codec
+	 */
+	if (card && dev->udev)
+		snd_card_free(card);
+
+	return 0;
+}
diff --git a/drivers/media/video/stk1160/stk1160-core.c b/drivers/media/video/stk1160/stk1160-core.c
new file mode 100644
index 00000000000..74236fd3b7e
--- /dev/null
+++ b/drivers/media/video/stk1160/stk1160-core.c
@@ -0,0 +1,432 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ *	Copyright (C) 2010 R.M. Thomas
+ *	<rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * TODO:
+ *
+ * 1. (Try to) detect if we must register ac97 mixer
+ * 2. Support stream at lower speed: lower frame rate or lower frame size.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+
+#include <linux/usb.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <media/saa7115.h>
+
+#include "stk1160.h"
+#include "stk1160-reg.h"
+
+static unsigned int input;
+module_param(input, int, 0644);
+MODULE_PARM_DESC(input, "Set default input");
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ezequiel Garcia");
+MODULE_DESCRIPTION("STK1160 driver");
+
+/* Devices supported by this driver */
+static struct usb_device_id stk1160_id_table[] = {
+	{ USB_DEVICE(0x05e1, 0x0408) },
+	{ }
+};
+MODULE_DEVICE_TABLE(usb, stk1160_id_table);
+
+/* saa7113 I2C address */
+static unsigned short saa7113_addrs[] = {
+	0x4a >> 1,
+	I2C_CLIENT_END
+};
+
+/*
+ * Read/Write stk registers
+ */
+int stk1160_read_reg(struct stk1160 *dev, u16 reg, u8 *value)
+{
+	int ret;
+	int pipe = usb_rcvctrlpipe(dev->udev, 0);
+
+	*value = 0;
+	ret = usb_control_msg(dev->udev, pipe, 0x00,
+			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			0x00, reg, value, sizeof(u8), HZ);
+	if (ret < 0) {
+		stk1160_err("read failed on reg 0x%x (%d)\n",
+			reg, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value)
+{
+	int ret;
+	int pipe = usb_sndctrlpipe(dev->udev, 0);
+
+	ret =  usb_control_msg(dev->udev, pipe, 0x01,
+			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			value, reg, NULL, 0, HZ);
+	if (ret < 0) {
+		stk1160_err("write failed on reg 0x%x (%d)\n",
+			reg, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+void stk1160_select_input(struct stk1160 *dev)
+{
+	static const u8 gctrl[] = {
+		0x98, 0x90, 0x88, 0x80
+	};
+
+	if (dev->ctl_input < ARRAY_SIZE(gctrl))
+		stk1160_write_reg(dev, STK1160_GCTRL, gctrl[dev->ctl_input]);
+}
+
+/* TODO: We should break this into pieces */
+static void stk1160_reg_reset(struct stk1160 *dev)
+{
+	int i;
+
+	static const struct regval ctl[] = {
+		{STK1160_GCTRL+2, 0x0078},
+
+		{STK1160_RMCTL+1, 0x0000},
+		{STK1160_RMCTL+3, 0x0002},
+
+		{STK1160_PLLSO,   0x0010},
+		{STK1160_PLLSO+1, 0x0000},
+		{STK1160_PLLSO+2, 0x0014},
+		{STK1160_PLLSO+3, 0x000E},
+
+		{STK1160_PLLFD,   0x0046},
+
+		/* Timing generator setup */
+		{STK1160_TIGEN,   0x0012},
+		{STK1160_TICTL,   0x002D},
+		{STK1160_TICTL+1, 0x0001},
+		{STK1160_TICTL+2, 0x0000},
+		{STK1160_TICTL+3, 0x0000},
+		{STK1160_TIGEN,   0x0080},
+
+		{0xffff, 0xffff}
+	};
+
+	for (i = 0; ctl[i].reg != 0xffff; i++)
+		stk1160_write_reg(dev, ctl[i].reg, ctl[i].val);
+}
+
+static void stk1160_release(struct v4l2_device *v4l2_dev)
+{
+	struct stk1160 *dev = container_of(v4l2_dev, struct stk1160, v4l2_dev);
+
+	stk1160_info("releasing all resources\n");
+
+	stk1160_i2c_unregister(dev);
+
+	v4l2_ctrl_handler_free(&dev->ctrl_handler);
+	v4l2_device_unregister(&dev->v4l2_dev);
+	kfree(dev->alt_max_pkt_size);
+	kfree(dev);
+}
+
+/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
+#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
+
+/*
+ * Scan usb interface and populate max_pkt_size array
+ * with information on each alternate setting.
+ * The array should be allocated by the caller.
+ */
+static int stk1160_scan_usb(struct usb_interface *intf, struct usb_device *udev,
+		unsigned int *max_pkt_size)
+{
+	int i, e, sizedescr, size, ifnum;
+	const struct usb_endpoint_descriptor *desc;
+
+	bool has_video = false, has_audio = false;
+	const char *speed;
+
+	ifnum = intf->altsetting[0].desc.bInterfaceNumber;
+
+	/* Get endpoints */
+	for (i = 0; i < intf->num_altsetting; i++) {
+
+		for (e = 0; e < intf->altsetting[i].desc.bNumEndpoints; e++) {
+
+			/* This isn't clear enough, at least to me */
+			desc = &intf->altsetting[i].endpoint[e].desc;
+			sizedescr = le16_to_cpu(desc->wMaxPacketSize);
+			size = sizedescr & 0x7ff;
+
+			if (udev->speed == USB_SPEED_HIGH)
+				size = size * hb_mult(sizedescr);
+
+			if (usb_endpoint_xfer_isoc(desc) &&
+			    usb_endpoint_dir_in(desc)) {
+				switch (desc->bEndpointAddress) {
+				case STK1160_EP_AUDIO:
+					has_audio = true;
+					break;
+				case STK1160_EP_VIDEO:
+					has_video = true;
+					max_pkt_size[i] = size;
+					break;
+				}
+			}
+		}
+	}
+
+	/* Is this even possible? */
+	if (!(has_audio || has_video)) {
+		dev_err(&udev->dev, "no audio or video endpoints found\n");
+		return -ENODEV;
+	}
+
+	switch (udev->speed) {
+	case USB_SPEED_LOW:
+		speed = "1.5";
+		break;
+	case USB_SPEED_FULL:
+		speed = "12";
+		break;
+	case USB_SPEED_HIGH:
+		speed = "480";
+		break;
+	default:
+		speed = "unknown";
+	}
+
+	dev_info(&udev->dev, "New device %s %s @ %s Mbps (%04x:%04x, interface %d, class %d)\n",
+		udev->manufacturer ? udev->manufacturer : "",
+		udev->product ? udev->product : "",
+		speed,
+		le16_to_cpu(udev->descriptor.idVendor),
+		le16_to_cpu(udev->descriptor.idProduct),
+		ifnum,
+		intf->altsetting->desc.bInterfaceNumber);
+
+	/* This should never happen, since we rejected audio interfaces */
+	if (has_audio)
+		dev_warn(&udev->dev, "audio interface %d found.\n\
+				This is not implemented by this driver,\
+				you should use snd-usb-audio instead\n", ifnum);
+
+	if (has_video)
+		dev_info(&udev->dev, "video interface %d found\n",
+				ifnum);
+
+	/*
+	 * Make sure we have 480 Mbps of bandwidth, otherwise things like
+	 * video stream wouldn't likely work, since 12 Mbps is generally
+	 * not enough even for most streams.
+	 */
+	if (udev->speed != USB_SPEED_HIGH)
+		dev_warn(&udev->dev, "must be connected to a high-speed USB 2.0 port\n\
+				You may not be able to stream video smoothly\n");
+
+	return 0;
+}
+
+static int stk1160_probe(struct usb_interface *interface,
+		const struct usb_device_id *id)
+{
+	int ifnum;
+	int rc = 0;
+
+	unsigned int *alt_max_pkt_size;	/* array of wMaxPacketSize */
+	struct usb_device *udev;
+	struct stk1160 *dev;
+
+	ifnum = interface->altsetting[0].desc.bInterfaceNumber;
+	udev = interface_to_usbdev(interface);
+
+	/*
+	 * Since usb audio class is supported by snd-usb-audio,
+	 * we reject audio interface.
+	 */
+	if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO)
+		return -ENODEV;
+
+	/* Alloc an array for all possible max_pkt_size */
+	alt_max_pkt_size = kmalloc(sizeof(alt_max_pkt_size[0]) *
+			interface->num_altsetting, GFP_KERNEL);
+	if (alt_max_pkt_size == NULL)
+		return -ENOMEM;
+
+	/*
+	 * Scan usb posibilities and populate alt_max_pkt_size array.
+	 * Also, check if device speed is fast enough.
+	 */
+	rc = stk1160_scan_usb(interface, udev, alt_max_pkt_size);
+	if (rc < 0) {
+		kfree(alt_max_pkt_size);
+		return rc;
+	}
+
+	dev = kzalloc(sizeof(struct stk1160), GFP_KERNEL);
+	if (dev == NULL) {
+		kfree(alt_max_pkt_size);
+		return -ENOMEM;
+	}
+
+	dev->alt_max_pkt_size = alt_max_pkt_size;
+	dev->udev = udev;
+	dev->num_alt = interface->num_altsetting;
+	dev->ctl_input = input;
+
+	/* We save struct device for debug purposes only */
+	dev->dev = &interface->dev;
+
+	usb_set_intfdata(interface, dev);
+
+	/* initialize videobuf2 stuff */
+	rc = stk1160_vb2_setup(dev);
+	if (rc < 0)
+		goto free_err;
+
+	/*
+	 * There is no need to take any locks here in probe
+	 * because we register the device node as the *last* thing.
+	 */
+	spin_lock_init(&dev->buf_lock);
+	mutex_init(&dev->v4l_lock);
+	mutex_init(&dev->vb_queue_lock);
+
+	rc = v4l2_ctrl_handler_init(&dev->ctrl_handler, 0);
+	if (rc) {
+		stk1160_err("v4l2_ctrl_handler_init failed (%d)\n", rc);
+		goto free_err;
+	}
+
+	/*
+	 * We obtain a v4l2_dev but defer
+	 * registration of video device node as the last thing.
+	 * There is no need to set the name if we give a device struct
+	 */
+	dev->v4l2_dev.release = stk1160_release;
+	dev->v4l2_dev.ctrl_handler = &dev->ctrl_handler;
+	rc = v4l2_device_register(dev->dev, &dev->v4l2_dev);
+	if (rc) {
+		stk1160_err("v4l2_device_register failed (%d)\n", rc);
+		goto free_ctrl;
+	}
+
+	rc = stk1160_i2c_register(dev);
+	if (rc < 0)
+		goto unreg_v4l2;
+
+	/*
+	 * To the best of my knowledge stk1160 boards only have
+	 * saa7113, but it doesn't hurt to support them all.
+	 */
+	dev->sd_saa7115 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &dev->i2c_adap,
+		"saa7115_auto", 0, saa7113_addrs);
+
+	stk1160_info("driver ver %s successfully loaded\n",
+		STK1160_VERSION);
+
+	/* i2c reset saa711x */
+	v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 0);
+	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
+				0, 0, 0);
+	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
+
+	/* reset stk1160 to default values */
+	stk1160_reg_reset(dev);
+
+	/* select default input */
+	stk1160_select_input(dev);
+
+	stk1160_ac97_register(dev);
+
+	rc = stk1160_video_register(dev);
+	if (rc < 0)
+		goto unreg_i2c;
+
+	return 0;
+
+unreg_i2c:
+	stk1160_i2c_unregister(dev);
+unreg_v4l2:
+	v4l2_device_unregister(&dev->v4l2_dev);
+free_ctrl:
+	v4l2_ctrl_handler_free(&dev->ctrl_handler);
+free_err:
+	kfree(alt_max_pkt_size);
+	kfree(dev);
+
+	return rc;
+}
+
+static void stk1160_disconnect(struct usb_interface *interface)
+{
+	struct stk1160 *dev;
+
+	dev = usb_get_intfdata(interface);
+	usb_set_intfdata(interface, NULL);
+
+	/*
+	 * Wait until all current v4l2 operation are finished
+	 * then deallocate resources
+	 */
+	mutex_lock(&dev->vb_queue_lock);
+	mutex_lock(&dev->v4l_lock);
+
+	/* Here is the only place where isoc get released */
+	stk1160_uninit_isoc(dev);
+
+	/* ac97 unregister needs to be done before usb_device is cleared */
+	stk1160_ac97_unregister(dev);
+
+	stk1160_clear_queue(dev);
+
+	video_unregister_device(&dev->vdev);
+	v4l2_device_disconnect(&dev->v4l2_dev);
+
+	/* This way current users can detect device is gone */
+	dev->udev = NULL;
+
+	mutex_unlock(&dev->v4l_lock);
+	mutex_unlock(&dev->vb_queue_lock);
+
+	/*
+	 * This calls stk1160_release if it's the last reference.
+	 * therwise, release is posponed until there are no users left.
+	 */
+	v4l2_device_put(&dev->v4l2_dev);
+}
+
+static struct usb_driver stk1160_usb_driver = {
+	.name = "stk1160",
+	.id_table = stk1160_id_table,
+	.probe = stk1160_probe,
+	.disconnect = stk1160_disconnect,
+};
+
+module_usb_driver(stk1160_usb_driver);
diff --git a/drivers/media/video/stk1160/stk1160-i2c.c b/drivers/media/video/stk1160/stk1160-i2c.c
new file mode 100644
index 00000000000..176ac937306
--- /dev/null
+++ b/drivers/media/video/stk1160/stk1160-i2c.c
@@ -0,0 +1,294 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ *	Copyright (C) 2010 R.M. Thomas
+ *	<rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/i2c.h>
+
+#include "stk1160.h"
+#include "stk1160-reg.h"
+
+static unsigned int i2c_debug;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
+
+#define dprintk_i2c(fmt, args...)				\
+do {								\
+	if (i2c_debug)						\
+		printk(KERN_DEBUG fmt, ##args);			\
+} while (0)
+
+static int stk1160_i2c_busy_wait(struct stk1160 *dev, u8 wait_bit_mask)
+{
+	unsigned long end;
+	u8 flag;
+
+	/* Wait until read/write finish bit is set */
+	end = jiffies + msecs_to_jiffies(STK1160_I2C_TIMEOUT);
+	while (time_is_after_jiffies(end)) {
+
+		stk1160_read_reg(dev, STK1160_SICTL+1, &flag);
+		/* read/write done? */
+		if (flag & wait_bit_mask)
+			goto done;
+
+		usleep_range(10 * USEC_PER_MSEC, 20 * USEC_PER_MSEC);
+	}
+
+	return -ETIMEDOUT;
+
+done:
+	return 0;
+}
+
+static int stk1160_i2c_write_reg(struct stk1160 *dev, u8 addr,
+		u8 reg, u8 value)
+{
+	int rc;
+
+	/* Set serial device address */
+	rc = stk1160_write_reg(dev, STK1160_SICTL_SDA, addr);
+	if (rc < 0)
+		return rc;
+
+	/* Set i2c device register sub-address */
+	rc = stk1160_write_reg(dev, STK1160_SBUSW_WA, reg);
+	if (rc < 0)
+		return rc;
+
+	/* Set i2c device register value */
+	rc = stk1160_write_reg(dev, STK1160_SBUSW_WD, value);
+	if (rc < 0)
+		return rc;
+
+	/* Start write now */
+	rc = stk1160_write_reg(dev, STK1160_SICTL, 0x01);
+	if (rc < 0)
+		return rc;
+
+	rc = stk1160_i2c_busy_wait(dev, 0x04);
+	if (rc < 0)
+		return rc;
+
+	return 0;
+}
+
+static int stk1160_i2c_read_reg(struct stk1160 *dev, u8 addr,
+		u8 reg, u8 *value)
+{
+	int rc;
+
+	/* Set serial device address */
+	rc = stk1160_write_reg(dev, STK1160_SICTL_SDA, addr);
+	if (rc < 0)
+		return rc;
+
+	/* Set i2c device register sub-address */
+	rc = stk1160_write_reg(dev, STK1160_SBUSR_RA, reg);
+	if (rc < 0)
+		return rc;
+
+	/* Start read now */
+	rc = stk1160_write_reg(dev, STK1160_SICTL, 0x20);
+	if (rc < 0)
+		return rc;
+
+	rc = stk1160_i2c_busy_wait(dev, 0x01);
+	if (rc < 0)
+		return rc;
+
+	stk1160_read_reg(dev, STK1160_SBUSR_RD, value);
+	if (rc < 0)
+		return rc;
+
+	return 0;
+}
+
+/*
+ * stk1160_i2c_check_for_device()
+ * check if there is a i2c_device at the supplied address
+ */
+static int stk1160_i2c_check_for_device(struct stk1160 *dev,
+		unsigned char addr)
+{
+	int rc;
+
+	/* Set serial device address */
+	rc = stk1160_write_reg(dev, STK1160_SICTL_SDA, addr);
+	if (rc < 0)
+		return rc;
+
+	/* Set device sub-address, we'll chip version reg */
+	rc = stk1160_write_reg(dev, STK1160_SBUSR_RA, 0x00);
+	if (rc < 0)
+		return rc;
+
+	/* Start read now */
+	rc = stk1160_write_reg(dev, STK1160_SICTL, 0x20);
+	if (rc < 0)
+		return rc;
+
+	rc = stk1160_i2c_busy_wait(dev, 0x01);
+	if (rc < 0)
+		return -ENODEV;
+
+	return 0;
+}
+
+/*
+ * stk1160_i2c_xfer()
+ * the main i2c transfer function
+ */
+static int stk1160_i2c_xfer(struct i2c_adapter *i2c_adap,
+			   struct i2c_msg msgs[], int num)
+{
+	struct stk1160 *dev = i2c_adap->algo_data;
+	int addr, rc, i;
+
+	for (i = 0; i < num; i++) {
+		addr = msgs[i].addr << 1;
+		dprintk_i2c("%s: addr=%x", __func__, addr);
+
+		if (!msgs[i].len) {
+			/* no len: check only for device presence */
+			rc = stk1160_i2c_check_for_device(dev, addr);
+			if (rc < 0) {
+				dprintk_i2c(" no device\n");
+				return rc;
+			}
+
+		} else if (msgs[i].flags & I2C_M_RD) {
+			/* read request without preceding register selection */
+			dprintk_i2c(" subaddr not selected");
+			rc = -EOPNOTSUPP;
+			goto err;
+
+		} else if (i + 1 < num && msgs[i].len <= 2 &&
+			   (msgs[i + 1].flags & I2C_M_RD) &&
+			   msgs[i].addr == msgs[i + 1].addr) {
+
+			if (msgs[i].len != 1 || msgs[i + 1].len != 1) {
+				dprintk_i2c(" len not supported");
+				rc = -EOPNOTSUPP;
+				goto err;
+			}
+
+			dprintk_i2c(" subaddr=%x", msgs[i].buf[0]);
+
+			rc = stk1160_i2c_read_reg(dev, addr, msgs[i].buf[0],
+				msgs[i + 1].buf);
+
+			dprintk_i2c(" read=%x", *msgs[i + 1].buf);
+
+			/* consumed two msgs, so we skip one of them */
+			i++;
+
+		} else {
+			if (msgs[i].len != 2) {
+				dprintk_i2c(" len not supported");
+				rc = -EOPNOTSUPP;
+				goto err;
+			}
+
+			dprintk_i2c(" subaddr=%x write=%x",
+				msgs[i].buf[0],  msgs[i].buf[1]);
+
+			rc = stk1160_i2c_write_reg(dev, addr, msgs[i].buf[0],
+				msgs[i].buf[1]);
+		}
+
+		if (rc < 0)
+			goto err;
+		dprintk_i2c(" OK\n");
+	}
+
+	return num;
+err:
+	dprintk_i2c(" ERROR: %d\n", rc);
+	return num;
+}
+
+/*
+ * functionality(), what da heck is this?
+ */
+static u32 functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm algo = {
+	.master_xfer   = stk1160_i2c_xfer,
+	.functionality = functionality,
+};
+
+static struct i2c_adapter adap_template = {
+	.owner = THIS_MODULE,
+	.name = "stk1160",
+	.algo = &algo,
+};
+
+static struct i2c_client client_template = {
+	.name = "stk1160 internal",
+};
+
+/*
+ * stk1160_i2c_register()
+ * register i2c bus
+ */
+int stk1160_i2c_register(struct stk1160 *dev)
+{
+	int rc;
+
+	dev->i2c_adap = adap_template;
+	dev->i2c_adap.dev.parent = dev->dev;
+	strcpy(dev->i2c_adap.name, "stk1160");
+	dev->i2c_adap.algo_data = dev;
+
+	i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
+
+	rc = i2c_add_adapter(&dev->i2c_adap);
+	if (rc < 0) {
+		stk1160_err("cannot add i2c adapter (%d)\n", rc);
+		return rc;
+	}
+
+	dev->i2c_client = client_template;
+	dev->i2c_client.adapter = &dev->i2c_adap;
+
+	/* Set i2c clock divider device address */
+	stk1160_write_reg(dev, STK1160_SICTL_CD,  0x0f);
+
+	/* ??? */
+	stk1160_write_reg(dev, STK1160_ASIC + 3,  0x00);
+
+	return 0;
+}
+
+/*
+ * stk1160_i2c_unregister()
+ * unregister i2c_bus
+ */
+int stk1160_i2c_unregister(struct stk1160 *dev)
+{
+	i2c_del_adapter(&dev->i2c_adap);
+	return 0;
+}
diff --git a/drivers/media/video/stk1160/stk1160-reg.h b/drivers/media/video/stk1160/stk1160-reg.h
new file mode 100644
index 00000000000..3e49da6e7ed
--- /dev/null
+++ b/drivers/media/video/stk1160/stk1160-reg.h
@@ -0,0 +1,93 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ *	Copyright (C) 2010 R.M. Thomas
+ *	<rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+/* GPIO Control */
+#define STK1160_GCTRL			0x000
+
+/* Remote Wakup Control */
+#define STK1160_RMCTL			0x00c
+
+/*
+ * Decoder Control Register:
+ * This byte controls capture start/stop
+ * with bit #7 (0x?? OR 0x80 to activate).
+ */
+#define STK1160_DCTRL			0x100
+
+/* Capture Frame Start Position */
+#define STK116_CFSPO			0x110
+#define STK116_CFSPO_STX_L		0x110
+#define STK116_CFSPO_STX_H		0x111
+#define STK116_CFSPO_STY_L		0x112
+#define STK116_CFSPO_STY_H		0x113
+
+/* Capture Frame End Position */
+#define STK116_CFEPO			0x114
+#define STK116_CFEPO_ENX_L		0x114
+#define STK116_CFEPO_ENX_H		0x115
+#define STK116_CFEPO_ENY_L		0x116
+#define STK116_CFEPO_ENY_H		0x117
+
+/* Serial Interface Control  */
+#define STK1160_SICTL			0x200
+#define STK1160_SICTL_CD		0x202
+#define STK1160_SICTL_SDA		0x203
+
+/* Serial Bus Write */
+#define STK1160_SBUSW			0x204
+#define STK1160_SBUSW_WA		0x204
+#define STK1160_SBUSW_WD		0x205
+
+/* Serial Bus Read */
+#define STK1160_SBUSR			0x208
+#define STK1160_SBUSR_RA		0x208
+#define STK1160_SBUSR_RD		0x209
+
+/* Alternate Serial Inteface Control */
+#define STK1160_ASIC			0x2fc
+
+/* PLL Select Options */
+#define STK1160_PLLSO			0x018
+
+/* PLL Frequency Divider */
+#define STK1160_PLLFD			0x01c
+
+/* Timing Generator */
+#define STK1160_TIGEN			0x300
+
+/* Timing Control Parameter */
+#define STK1160_TICTL			0x350
+
+/* AC97 Audio Control */
+#define STK1160_AC97CTL_0		0x500
+#define STK1160_AC97CTL_1		0x504
+
+/* Use [0:6] bits of register 0x504 to set codec command address */
+#define STK1160_AC97_ADDR		0x504
+/* Use [16:31] bits of register 0x500 to set codec command data */
+#define STK1160_AC97_CMD		0x502
+
+/* Audio I2S Interface */
+#define STK1160_I2SCTL			0x50c
+
+/* EEPROM Interface */
+#define STK1160_EEPROM_SZ		0x5f0
diff --git a/drivers/media/video/stk1160/stk1160-v4l.c b/drivers/media/video/stk1160/stk1160-v4l.c
new file mode 100644
index 00000000000..360bdbee427
--- /dev/null
+++ b/drivers/media/video/stk1160/stk1160-v4l.c
@@ -0,0 +1,738 @@
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ *	Copyright (C) 2010 R.M. Thomas
+ *	<rmthomas--a.t--sciolus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/videobuf2-vmalloc.h>
+
+#include <media/saa7115.h>
+