summaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/stk1160/stk1160-core.c
blob: bea8bbbb84fba2978cfa98567ef421f5a3fed945 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
/*
 * 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);
	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);

	/* 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.
	 * 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);
OpenPOWER on IntegriCloud