[deliverable/linux.git] / drivers / media / usb / stk1160 / stk1160-core.c

/*
 * 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 rc = 0;

	unsigned int *alt_max_pkt_size;	/* array of wMaxPacketSize */
	struct usb_device *udev;
	struct stk1160 *dev;

	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);
Commit	Line	Data
9cb2173e EG	1	/*
	2	* STK1160 driver
	3	*
	4	* Copyright (C) 2012 Ezequiel Garcia
	5	* <elezegarcia--a.t--gmail.com>
	6	*
	7	* Based on Easycap driver by R.M. Thomas
	8	* Copyright (C) 2010 R.M. Thomas
	9	* <rmthomas--a.t--sciolus.org>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* TODO:
	22	*
	23	* 1. (Try to) detect if we must register ac97 mixer
	24	* 2. Support stream at lower speed: lower frame rate or lower frame size.
	25	*
	26	*/
	27
	28	#include <linux/module.h>
	29	#include <linux/init.h>
	30	#include <linux/kernel.h>
	31	#include <linux/errno.h>
	32	#include <linux/slab.h>
	33
	34	#include <linux/usb.h>
	35	#include <linux/mm.h>
	36	#include <linux/vmalloc.h>
	37	#include <media/saa7115.h>
	38
	39	#include "stk1160.h"
	40	#include "stk1160-reg.h"
	41
	42	static unsigned int input;
	43	module_param(input, int, 0644);
	44	MODULE_PARM_DESC(input, "Set default input");
	45
	46	MODULE_LICENSE("GPL");
	47	MODULE_AUTHOR("Ezequiel Garcia");
	48	MODULE_DESCRIPTION("STK1160 driver");
	49
	50	/* Devices supported by this driver */
	51	static struct usb_device_id stk1160_id_table[] = {
	52	{ USB_DEVICE(0x05e1, 0x0408) },
	53	{ }
	54	};
	55	MODULE_DEVICE_TABLE(usb, stk1160_id_table);
	56
	57	/* saa7113 I2C address */
	58	static unsigned short saa7113_addrs[] = {
	59	0x4a >> 1,
	60	I2C_CLIENT_END
	61	};
	62
	63	/*
	64	* Read/Write stk registers
65	*/
66	int stk1160_read_reg(struct stk1160 dev, u16 reg, u8 value)
67	{
68	int ret;
69	int pipe = usb_rcvctrlpipe(dev->udev, 0);
70
71	*value = 0;
72	ret = usb_control_msg(dev->udev, pipe, 0x00,
73	USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
74	0x00, reg, value, sizeof(u8), HZ);
75	if (ret < 0) {
76	stk1160_err("read failed on reg 0x%x (%d)\n",
77	reg, ret);
78	return ret;
79	}
80
81	return 0;
82	}
83
84	int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value)
85	{
86	int ret;
87	int pipe = usb_sndctrlpipe(dev->udev, 0);
88
89	ret = usb_control_msg(dev->udev, pipe, 0x01,
90	USB_DIR_OUT \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
91	value, reg, NULL, 0, HZ);
92	if (ret < 0) {
93	stk1160_err("write failed on reg 0x%x (%d)\n",
94	reg, ret);
95	return ret;
96	}
97
98	return 0;
99	}
100
101	void stk1160_select_input(struct stk1160 *dev)
102	{
103	static const u8 gctrl[] = {
104	0x98, 0x90, 0x88, 0x80
105	};
106
107	if (dev->ctl_input < ARRAY_SIZE(gctrl))
108	stk1160_write_reg(dev, STK1160_GCTRL, gctrl[dev->ctl_input]);
109	}
110
111	/* TODO: We should break this into pieces */
112	static void stk1160_reg_reset(struct stk1160 *dev)
113	{
114	int i;
115
116	static const struct regval ctl[] = {
117	{STK1160_GCTRL+2, 0x0078},
118
119	{STK1160_RMCTL+1, 0x0000},
120	{STK1160_RMCTL+3, 0x0002},
121
122	{STK1160_PLLSO, 0x0010},
123	{STK1160_PLLSO+1, 0x0000},
124	{STK1160_PLLSO+2, 0x0014},
125	{STK1160_PLLSO+3, 0x000E},
126
127	{STK1160_PLLFD, 0x0046},
128
129	/* Timing generator setup */
130	{STK1160_TIGEN, 0x0012},
131	{STK1160_TICTL, 0x002D},
132	{STK1160_TICTL+1, 0x0001},
133	{STK1160_TICTL+2, 0x0000},
134	{STK1160_TICTL+3, 0x0000},
135	{STK1160_TIGEN, 0x0080},
136
137	{0xffff, 0xffff}
138	};
139
140	for (i = 0; ctl[i].reg != 0xffff; i++)
141	stk1160_write_reg(dev, ctl[i].reg, ctl[i].val);
142	}
143
144	static void stk1160_release(struct v4l2_device *v4l2_dev)
145	{
146	struct stk1160 *dev = container_of(v4l2_dev, struct stk1160, v4l2_dev);
147
148	stk1160_info("releasing all resources\n");
149
150	stk1160_i2c_unregister(dev);
151
152	v4l2_ctrl_handler_free(&dev->ctrl_handler);
153	v4l2_device_unregister(&dev->v4l2_dev);
154	kfree(dev->alt_max_pkt_size);
155	kfree(dev);
156	}
157
158	/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
159	#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
160
161	/*
162	* Scan usb interface and populate max_pkt_size array
163	* with information on each alternate setting.
164	* The array should be allocated by the caller.
165	*/
166	static int stk1160_scan_usb(struct usb_interface intf, struct usb_device udev,
167	unsigned int *max_pkt_size)
168	{
169	int i, e, sizedescr, size, ifnum;
170	const struct usb_endpoint_descriptor *desc;
171
172	bool has_video = false, has_audio = false;
173	const char *speed;
174
175	ifnum = intf->altsetting[0].desc.bInterfaceNumber;
176
177	/* Get endpoints */
178	for (i = 0; i < intf->num_altsetting; i++) {
179
180	for (e = 0; e < intf->altsetting[i].desc.bNumEndpoints; e++) {
181
182	/* This isn't clear enough, at least to me */
183	desc = &intf->altsetting[i].endpoint[e].desc;
184	sizedescr = le16_to_cpu(desc->wMaxPacketSize);
185	size = sizedescr & 0x7ff;
186
187	if (udev->speed == USB_SPEED_HIGH)
188	size = size * hb_mult(sizedescr);
189
190	if (usb_endpoint_xfer_isoc(desc) &&
191	usb_endpoint_dir_in(desc)) {
192	switch (desc->bEndpointAddress) {
193	case STK1160_EP_AUDIO:
194	has_audio = true;
195	break;
196	case STK1160_EP_VIDEO:
197	has_video = true;
198	max_pkt_size[i] = size;
199	break;
200	}
201	}
202	}
203	}
204
205	/* Is this even possible? */
206	if (!(has_audio \|\| has_video)) {
207	dev_err(&udev->dev, "no audio or video endpoints found\n");
208	return -ENODEV;
209	}
210
211	switch (udev->speed) {
212	case USB_SPEED_LOW:
213	speed = "1.5";
214	break;
215	case USB_SPEED_FULL:
216	speed = "12";
217	break;
218	case USB_SPEED_HIGH:
219	speed = "480";
220	break;
221	default:
222	speed = "unknown";
223	}
224
225	dev_info(&udev->dev, "New device %s %s @ %s Mbps (%04x:%04x, interface %d, class %d)\n",
226	udev->manufacturer ? udev->manufacturer : "",
227	udev->product ? udev->product : "",
228	speed,
229	le16_to_cpu(udev->descriptor.idVendor),
230	le16_to_cpu(udev->descriptor.idProduct),
231	ifnum,
232	intf->altsetting->desc.bInterfaceNumber);
233
234	/* This should never happen, since we rejected audio interfaces */
235	if (has_audio)
236	dev_warn(&udev->dev, "audio interface %d found.\n\
237	This is not implemented by this driver,\
238	you should use snd-usb-audio instead\n", ifnum);
239
240	if (has_video)
241	dev_info(&udev->dev, "video interface %d found\n",
242	ifnum);
243
244	/*
245	* Make sure we have 480 Mbps of bandwidth, otherwise things like
246	* video stream wouldn't likely work, since 12 Mbps is generally
247	* not enough even for most streams.
248	*/
249	if (udev->speed != USB_SPEED_HIGH)
250	dev_warn(&udev->dev, "must be connected to a high-speed USB 2.0 port\n\
251	You may not be able to stream video smoothly\n");
252
253	return 0;
254	}
255
256	static int stk1160_probe(struct usb_interface *interface,
257	const struct usb_device_id *id)
258	{
9cb2173e EG	259	int rc = 0;
	260
	261	unsigned int alt_max_pkt_size; / array of wMaxPacketSize */
	262	struct usb_device *udev;
	263	struct stk1160 *dev;
	264
9cb2173e EG	265	udev = interface_to_usbdev(interface);
	266
	267	/*
	268	* Since usb audio class is supported by snd-usb-audio,
	269	* we reject audio interface.
	270	*/
	271	if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO)
	272	return -ENODEV;
	273
	274	/* Alloc an array for all possible max_pkt_size */
	275	alt_max_pkt_size = kmalloc(sizeof(alt_max_pkt_size[0]) *
	276	interface->num_altsetting, GFP_KERNEL);
	277	if (alt_max_pkt_size == NULL)
	278	return -ENOMEM;
	279
	280	/*
	281	* Scan usb posibilities and populate alt_max_pkt_size array.
	282	* Also, check if device speed is fast enough.
	283	*/
	284	rc = stk1160_scan_usb(interface, udev, alt_max_pkt_size);
	285	if (rc < 0) {
	286	kfree(alt_max_pkt_size);
	287	return rc;
	288	}
	289
	290	dev = kzalloc(sizeof(struct stk1160), GFP_KERNEL);
	291	if (dev == NULL) {
	292	kfree(alt_max_pkt_size);
	293	return -ENOMEM;
	294	}
	295
	296	dev->alt_max_pkt_size = alt_max_pkt_size;
	297	dev->udev = udev;
	298	dev->num_alt = interface->num_altsetting;
	299	dev->ctl_input = input;
	300
	301	/* We save struct device for debug purposes only */
	302	dev->dev = &interface->dev;
	303
	304	usb_set_intfdata(interface, dev);
	305
	306	/* initialize videobuf2 stuff */
	307	rc = stk1160_vb2_setup(dev);
	308	if (rc < 0)
	309	goto free_err;
	310
	311	/*
	312	* There is no need to take any locks here in probe
	313	* because we register the device node as the last thing.
	314	*/
	315	spin_lock_init(&dev->buf_lock);
	316	mutex_init(&dev->v4l_lock);
	317	mutex_init(&dev->vb_queue_lock);
	318
	319	rc = v4l2_ctrl_handler_init(&dev->ctrl_handler, 0);
	320	if (rc) {
	321	stk1160_err("v4l2_ctrl_handler_init failed (%d)\n", rc);
	322	goto free_err;
	323	}
	324
	325	/*
	326	* We obtain a v4l2_dev but defer
	327	* registration of video device node as the last thing.
	328	* There is no need to set the name if we give a device struct
329	*/
330	dev->v4l2_dev.release = stk1160_release;
331	dev->v4l2_dev.ctrl_handler = &dev->ctrl_handler;
332	rc = v4l2_device_register(dev->dev, &dev->v4l2_dev);
333	if (rc) {
334	stk1160_err("v4l2_device_register failed (%d)\n", rc);
335	goto free_ctrl;
336	}
337
338	rc = stk1160_i2c_register(dev);
339	if (rc < 0)
340	goto unreg_v4l2;
341
342	/*
343	* To the best of my knowledge stk1160 boards only have
344	* saa7113, but it doesn't hurt to support them all.
345	*/
346	dev->sd_saa7115 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &dev->i2c_adap,
347	"saa7115_auto", 0, saa7113_addrs);
348
349	stk1160_info("driver ver %s successfully loaded\n",
350	STK1160_VERSION);
351
352	/* i2c reset saa711x */
353	v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 0);
354	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
355	0, 0, 0);
356	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
357
358	/* reset stk1160 to default values */
359	stk1160_reg_reset(dev);
360
361	/* select default input */
362	stk1160_select_input(dev);
363
364	stk1160_ac97_register(dev);
365
366	rc = stk1160_video_register(dev);
367	if (rc < 0)
368	goto unreg_i2c;
369
370	return 0;
371
372	unreg_i2c:
373	stk1160_i2c_unregister(dev);
374	unreg_v4l2:
375	v4l2_device_unregister(&dev->v4l2_dev);
376	free_ctrl:
377	v4l2_ctrl_handler_free(&dev->ctrl_handler);
378	free_err:
379	kfree(alt_max_pkt_size);
380	kfree(dev);
381
382	return rc;
383	}
384
385	static void stk1160_disconnect(struct usb_interface *interface)
386	{
387	struct stk1160 *dev;
388
389	dev = usb_get_intfdata(interface);
390	usb_set_intfdata(interface, NULL);
391
392	/*
393	* Wait until all current v4l2 operation are finished
394	* then deallocate resources
395	*/
396	mutex_lock(&dev->vb_queue_lock);
397	mutex_lock(&dev->v4l_lock);
398
399	/* Here is the only place where isoc get released */
400	stk1160_uninit_isoc(dev);
401
402	/* ac97 unregister needs to be done before usb_device is cleared */
403	stk1160_ac97_unregister(dev);
404
405	stk1160_clear_queue(dev);
406
407	video_unregister_device(&dev->vdev);
408	v4l2_device_disconnect(&dev->v4l2_dev);
409
410	/* This way current users can detect device is gone */
411	dev->udev = NULL;
412
413	mutex_unlock(&dev->v4l_lock);
414	mutex_unlock(&dev->vb_queue_lock);
415
416	/*
417	* This calls stk1160_release if it's the last reference.
418	* therwise, release is posponed until there are no users left.
419	*/
420	v4l2_device_put(&dev->v4l2_dev);
421	}
422
423	static struct usb_driver stk1160_usb_driver = {
424	.name = "stk1160",
425	.id_table = stk1160_id_table,
426	.probe = stk1160_probe,
427	.disconnect = stk1160_disconnect,
428	};
429
430	module_usb_driver(stk1160_usb_driver);