[linux-block.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. 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/i2c/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 const 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);
	u8 *buf;

	*value = 0;

	buf = kmalloc(sizeof(u8), GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	ret = usb_control_msg(dev->udev, pipe, 0x00,
			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			0x00, reg, buf, sizeof(u8), HZ);
	if (ret < 0) {
		stk1160_err("read failed on reg 0x%x (%d)\n",
			reg, ret);
		kfree(buf);
		return ret;
	}

	*value = *buf;
	kfree(buf);
	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)
{
	int route;
	static const u8 gctrl[] = {
		0x98, 0x90, 0x88, 0x80, 0x98
	};

	if (dev->ctl_input == STK1160_SVIDEO_INPUT)
		route = SAA7115_SVIDEO3;
	else
		route = SAA7115_COMPOSITE0;

	if (dev->ctl_input < ARRAY_SIZE(gctrl)) {
		v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
				route, 0, 0);
		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_dbg("releasing all resources\n");

	stk1160_i2c_unregister(dev);

	v4l2_ctrl_handler_free(&dev->ctrl_handler);
	v4l2_device_unregister(&dev->v4l2_dev);
	mutex_destroy(&dev->v4l_lock);
	mutex_destroy(&dev->vb_queue_lock);
	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_array(interface->num_altsetting,
					 sizeof(alt_max_pkt_size[0]),
					 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);

	/* i2c reset saa711x */
	v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 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_setup(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);

	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.
	 * Otherwise, 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	*
1dc7df4d	23	* 1. Support stream at lower speed: lower frame rate or lower frame size.
9cb2173e EG	24	*
	25	*/
	26
	27	#include <linux/module.h>
	28	#include <linux/init.h>
	29	#include <linux/kernel.h>
	30	#include <linux/errno.h>
	31	#include <linux/slab.h>
	32
	33	#include <linux/usb.h>
	34	#include <linux/mm.h>
	35	#include <linux/vmalloc.h>
b5dcee22	36	#include <media/i2c/saa7115.h>
9cb2173e EG	37
	38	#include "stk1160.h"
	39	#include "stk1160-reg.h"
	40
	41	static unsigned int input;
	42	module_param(input, int, 0644);
	43	MODULE_PARM_DESC(input, "Set default input");
	44
	45	MODULE_LICENSE("GPL");
	46	MODULE_AUTHOR("Ezequiel Garcia");
	47	MODULE_DESCRIPTION("STK1160 driver");
	48
	49	/* Devices supported by this driver */
7fb2e072	50	static const struct usb_device_id stk1160_id_table[] = {
9cb2173e EG	51	{ USB_DEVICE(0x05e1, 0x0408) },
	52	{ }
	53	};
	54	MODULE_DEVICE_TABLE(usb, stk1160_id_table);
	55
	56	/* saa7113 I2C address */
	57	static unsigned short saa7113_addrs[] = {
	58	0x4a >> 1,
	59	I2C_CLIENT_END
	60	};
	61
	62	/*
	63	* Read/Write stk registers
	64	*/
	65	int stk1160_read_reg(struct stk1160 dev, u16 reg, u8 value)
	66	{
	67	int ret;
	68	int pipe = usb_rcvctrlpipe(dev->udev, 0);
85ac1a17	69	u8 *buf;
9cb2173e EG	70
9cb2173e EG	71	*value = 0;
85ac1a17 EG	72
	73	buf = kmalloc(sizeof(u8), GFP_KERNEL);
	74	if (!buf)
	75	return -ENOMEM;
9cb2173e EG	76	ret = usb_control_msg(dev->udev, pipe, 0x00,
9cb2173e EG	77	USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
85ac1a17	78	0x00, reg, buf, sizeof(u8), HZ);
9cb2173e EG	79	if (ret < 0) {
	80	stk1160_err("read failed on reg 0x%x (%d)\n",
	81	reg, ret);
85ac1a17	82	kfree(buf);
9cb2173e EG	83	return ret;
	84	}
	85
85ac1a17 EG	86	value = buf;
85ac1a17 EG	87	kfree(buf);
9cb2173e EG	88	return 0;
	89	}
	90
	91	int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value)
	92	{
	93	int ret;
	94	int pipe = usb_sndctrlpipe(dev->udev, 0);
	95
	96	ret = usb_control_msg(dev->udev, pipe, 0x01,
	97	USB_DIR_OUT \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	98	value, reg, NULL, 0, HZ);
	99	if (ret < 0) {
	100	stk1160_err("write failed on reg 0x%x (%d)\n",
	101	reg, ret);
	102	return ret;
	103	}
	104
	105	return 0;
	106	}
	107
	108	void stk1160_select_input(struct stk1160 *dev)
	109	{
56a960bf	110	int route;
9cb2173e	111	static const u8 gctrl[] = {
56a960bf	112	0x98, 0x90, 0x88, 0x80, 0x98
9cb2173e EG	113	};
9cb2173e EG	114
56a960bf EG	115	if (dev->ctl_input == STK1160_SVIDEO_INPUT)
	116	route = SAA7115_SVIDEO3;
	117	else
	118	route = SAA7115_COMPOSITE0;
	119
	120	if (dev->ctl_input < ARRAY_SIZE(gctrl)) {
	121	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
	122	route, 0, 0);
9cb2173e	123	stk1160_write_reg(dev, STK1160_GCTRL, gctrl[dev->ctl_input]);
56a960bf	124	}
9cb2173e EG	125	}
	126
	127	/* TODO: We should break this into pieces */
	128	static void stk1160_reg_reset(struct stk1160 *dev)
	129	{
	130	int i;
	131
	132	static const struct regval ctl[] = {
	133	{STK1160_GCTRL+2, 0x0078},
	134
	135	{STK1160_RMCTL+1, 0x0000},
	136	{STK1160_RMCTL+3, 0x0002},
	137
	138	{STK1160_PLLSO, 0x0010},
	139	{STK1160_PLLSO+1, 0x0000},
	140	{STK1160_PLLSO+2, 0x0014},
	141	{STK1160_PLLSO+3, 0x000E},
	142
	143	{STK1160_PLLFD, 0x0046},
	144
	145	/* Timing generator setup */
	146	{STK1160_TIGEN, 0x0012},
	147	{STK1160_TICTL, 0x002D},
	148	{STK1160_TICTL+1, 0x0001},
	149	{STK1160_TICTL+2, 0x0000},
	150	{STK1160_TICTL+3, 0x0000},
	151	{STK1160_TIGEN, 0x0080},
	152
	153	{0xffff, 0xffff}
	154	};
	155
	156	for (i = 0; ctl[i].reg != 0xffff; i++)
	157	stk1160_write_reg(dev, ctl[i].reg, ctl[i].val);
	158	}
	159
	160	static void stk1160_release(struct v4l2_device *v4l2_dev)
	161	{
	162	struct stk1160 *dev = container_of(v4l2_dev, struct stk1160, v4l2_dev);
	163
890024ad	164	stk1160_dbg("releasing all resources\n");
9cb2173e EG	165
	166	stk1160_i2c_unregister(dev);
	167
	168	v4l2_ctrl_handler_free(&dev->ctrl_handler);
	169	v4l2_device_unregister(&dev->v4l2_dev);
31fa0d12 EG	170	mutex_destroy(&dev->v4l_lock);
31fa0d12 EG	171	mutex_destroy(&dev->vb_queue_lock);
9cb2173e EG	172	kfree(dev->alt_max_pkt_size);
	173	kfree(dev);
	174	}
	175
	176	/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
	177	#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
	178
	179	/*
	180	* Scan usb interface and populate max_pkt_size array
	181	* with information on each alternate setting.
	182	* The array should be allocated by the caller.
	183	*/
	184	static int stk1160_scan_usb(struct usb_interface intf, struct usb_device udev,
	185	unsigned int *max_pkt_size)
	186	{
	187	int i, e, sizedescr, size, ifnum;
	188	const struct usb_endpoint_descriptor *desc;
	189
	190	bool has_video = false, has_audio = false;
	191	const char *speed;
	192
	193	ifnum = intf->altsetting[0].desc.bInterfaceNumber;
	194
	195	/* Get endpoints */
	196	for (i = 0; i < intf->num_altsetting; i++) {
	197
	198	for (e = 0; e < intf->altsetting[i].desc.bNumEndpoints; e++) {
	199
	200	/* This isn't clear enough, at least to me */
	201	desc = &intf->altsetting[i].endpoint[e].desc;
	202	sizedescr = le16_to_cpu(desc->wMaxPacketSize);
	203	size = sizedescr & 0x7ff;
	204
	205	if (udev->speed == USB_SPEED_HIGH)
	206	size = size * hb_mult(sizedescr);
	207
	208	if (usb_endpoint_xfer_isoc(desc) &&
	209	usb_endpoint_dir_in(desc)) {
	210	switch (desc->bEndpointAddress) {
	211	case STK1160_EP_AUDIO:
	212	has_audio = true;
	213	break;
	214	case STK1160_EP_VIDEO:
	215	has_video = true;
	216	max_pkt_size[i] = size;
	217	break;
	218	}
	219	}
	220	}
	221	}
	222
	223	/* Is this even possible? */
	224	if (!(has_audio \|\| has_video)) {
	225	dev_err(&udev->dev, "no audio or video endpoints found\n");
	226	return -ENODEV;
	227	}
	228
	229	switch (udev->speed) {
	230	case USB_SPEED_LOW:
	231	speed = "1.5";
	232	break;
	233	case USB_SPEED_FULL:
	234	speed = "12";
	235	break;
236	case USB_SPEED_HIGH:
237	speed = "480";
238	break;
239	default:
240	speed = "unknown";
241	}
242
243	dev_info(&udev->dev, "New device %s %s @ %s Mbps (%04x:%04x, interface %d, class %d)\n",
244	udev->manufacturer ? udev->manufacturer : "",
245	udev->product ? udev->product : "",
246	speed,
247	le16_to_cpu(udev->descriptor.idVendor),
248	le16_to_cpu(udev->descriptor.idProduct),
249	ifnum,
250	intf->altsetting->desc.bInterfaceNumber);
251
252	/* This should never happen, since we rejected audio interfaces */
253	if (has_audio)
254	dev_warn(&udev->dev, "audio interface %d found.\n\
255	This is not implemented by this driver,\
256	you should use snd-usb-audio instead\n", ifnum);
257
258	if (has_video)
259	dev_info(&udev->dev, "video interface %d found\n",
260	ifnum);
261
262	/*
263	* Make sure we have 480 Mbps of bandwidth, otherwise things like
264	* video stream wouldn't likely work, since 12 Mbps is generally
265	* not enough even for most streams.
266	*/
267	if (udev->speed != USB_SPEED_HIGH)
268	dev_warn(&udev->dev, "must be connected to a high-speed USB 2.0 port\n\
269	You may not be able to stream video smoothly\n");
270
271	return 0;
272	}
273
274	static int stk1160_probe(struct usb_interface *interface,
275	const struct usb_device_id *id)
276	{
9cb2173e EG	277	int rc = 0;
	278
	279	unsigned int alt_max_pkt_size; / array of wMaxPacketSize */
	280	struct usb_device *udev;
	281	struct stk1160 *dev;
	282
9cb2173e EG	283	udev = interface_to_usbdev(interface);
	284
	285	/*
	286	* Since usb audio class is supported by snd-usb-audio,
	287	* we reject audio interface.
	288	*/
	289	if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO)
	290	return -ENODEV;
	291
	292	/* Alloc an array for all possible max_pkt_size */
6da2ec56 KC	293	alt_max_pkt_size = kmalloc_array(interface->num_altsetting,
	294	sizeof(alt_max_pkt_size[0]),
	295	GFP_KERNEL);
9cb2173e EG	296	if (alt_max_pkt_size == NULL)
	297	return -ENOMEM;
	298
	299	/*
	300	* Scan usb posibilities and populate alt_max_pkt_size array.
	301	* Also, check if device speed is fast enough.
	302	*/
	303	rc = stk1160_scan_usb(interface, udev, alt_max_pkt_size);
	304	if (rc < 0) {
	305	kfree(alt_max_pkt_size);
	306	return rc;
	307	}
	308
	309	dev = kzalloc(sizeof(struct stk1160), GFP_KERNEL);
	310	if (dev == NULL) {
	311	kfree(alt_max_pkt_size);
	312	return -ENOMEM;
	313	}
	314
	315	dev->alt_max_pkt_size = alt_max_pkt_size;
	316	dev->udev = udev;
	317	dev->num_alt = interface->num_altsetting;
	318	dev->ctl_input = input;
	319
	320	/* We save struct device for debug purposes only */
	321	dev->dev = &interface->dev;
	322
	323	usb_set_intfdata(interface, dev);
	324
	325	/* initialize videobuf2 stuff */
	326	rc = stk1160_vb2_setup(dev);
	327	if (rc < 0)
	328	goto free_err;
	329
	330	/*
	331	* There is no need to take any locks here in probe
	332	* because we register the device node as the last thing.
	333	*/
	334	spin_lock_init(&dev->buf_lock);
	335	mutex_init(&dev->v4l_lock);
	336	mutex_init(&dev->vb_queue_lock);
	337
	338	rc = v4l2_ctrl_handler_init(&dev->ctrl_handler, 0);
	339	if (rc) {
	340	stk1160_err("v4l2_ctrl_handler_init failed (%d)\n", rc);
	341	goto free_err;
	342	}
	343
	344	/*
	345	* We obtain a v4l2_dev but defer
	346	* registration of video device node as the last thing.
	347	* There is no need to set the name if we give a device struct
	348	*/
	349	dev->v4l2_dev.release = stk1160_release;
	350	dev->v4l2_dev.ctrl_handler = &dev->ctrl_handler;
	351	rc = v4l2_device_register(dev->dev, &dev->v4l2_dev);
	352	if (rc) {
	353	stk1160_err("v4l2_device_register failed (%d)\n", rc);
	354	goto free_ctrl;
	355	}
	356
	357	rc = stk1160_i2c_register(dev);
	358	if (rc < 0)
	359	goto unreg_v4l2;
360
361	/*
362	* To the best of my knowledge stk1160 boards only have
363	* saa7113, but it doesn't hurt to support them all.
364	*/
365	dev->sd_saa7115 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &dev->i2c_adap,
366	"saa7115_auto", 0, saa7113_addrs);
367
9cb2173e EG	368	/* i2c reset saa711x */
9cb2173e EG	369	v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 0);
9cb2173e EG	370	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
	371
	372	/* reset stk1160 to default values */
	373	stk1160_reg_reset(dev);
	374
	375	/* select default input */
	376	stk1160_select_input(dev);
	377
e36e6b5f	378	stk1160_ac97_setup(dev);
9cb2173e EG	379
	380	rc = stk1160_video_register(dev);
	381	if (rc < 0)
	382	goto unreg_i2c;
	383
	384	return 0;
	385
	386	unreg_i2c:
	387	stk1160_i2c_unregister(dev);
	388	unreg_v4l2:
	389	v4l2_device_unregister(&dev->v4l2_dev);
	390	free_ctrl:
	391	v4l2_ctrl_handler_free(&dev->ctrl_handler);
	392	free_err:
	393	kfree(alt_max_pkt_size);
	394	kfree(dev);
	395
	396	return rc;
	397	}
	398
	399	static void stk1160_disconnect(struct usb_interface *interface)
	400	{
	401	struct stk1160 *dev;
	402
	403	dev = usb_get_intfdata(interface);
	404	usb_set_intfdata(interface, NULL);
	405
	406	/*
	407	* Wait until all current v4l2 operation are finished
	408	* then deallocate resources
	409	*/
	410	mutex_lock(&dev->vb_queue_lock);
	411	mutex_lock(&dev->v4l_lock);
	412
	413	/* Here is the only place where isoc get released */
	414	stk1160_uninit_isoc(dev);
	415
9cb2173e EG	416	stk1160_clear_queue(dev);
	417
	418	video_unregister_device(&dev->vdev);
	419	v4l2_device_disconnect(&dev->v4l2_dev);
	420
	421	/* This way current users can detect device is gone */
	422	dev->udev = NULL;
	423
	424	mutex_unlock(&dev->v4l_lock);
	425	mutex_unlock(&dev->vb_queue_lock);
	426
	427	/*
	428	* This calls stk1160_release if it's the last reference.
9141386c	429	* Otherwise, release is posponed until there are no users left.
9cb2173e EG	430	*/
	431	v4l2_device_put(&dev->v4l2_dev);
	432	}
	433
	434	static struct usb_driver stk1160_usb_driver = {
	435	.name = "stk1160",
	436	.id_table = stk1160_id_table,
	437	.probe = stk1160_probe,
	438	.disconnect = stk1160_disconnect,
	439	};
	440
	441	module_usb_driver(stk1160_usb_driver);