Free Electrons

Embedded Linux Experts

  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
/*
 * Linux V4L2 radio driver for the Griffin radioSHARK USB radio receiver
 *
 * Note the radioSHARK offers the audio through a regular USB audio device,
 * this driver only handles the tuning.
 *
 * The info necessary to drive the shark was taken from the small userspace
 * shark.c program by Michael Rolig, which he kindly placed in the Public
 * Domain.
 *
 * Copyright (c) 2012 Hans de Goede <hdegoede@redhat.com>
 *
 * 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/init.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/workqueue.h>
#include <media/v4l2-device.h>
#include <media/drv-intf/tea575x.h>

#if defined(CONFIG_LEDS_CLASS) || \
    (defined(CONFIG_LEDS_CLASS_MODULE) && defined(CONFIG_RADIO_SHARK_MODULE))
#define SHARK_USE_LEDS 1
#endif

/*
 * Version Information
 */
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("Griffin radioSHARK, USB radio receiver driver");
MODULE_LICENSE("GPL");

#define SHARK_IN_EP		0x83
#define SHARK_OUT_EP		0x05

#define TEA575X_BIT_MONO	(1<<22)		/* 0 = stereo, 1 = mono */
#define TEA575X_BIT_BAND_MASK	(3<<20)
#define TEA575X_BIT_BAND_FM	(0<<20)

#define TB_LEN 6
#define DRV_NAME "radioshark"

#define v4l2_dev_to_shark(d) container_of(d, struct shark_device, v4l2_dev)

/* Note BLUE_IS_PULSE comes after NO_LEDS as it is a status bit, not a LED */
enum { BLUE_LED, BLUE_PULSE_LED, RED_LED, NO_LEDS, BLUE_IS_PULSE };

struct shark_device {
	struct usb_device *usbdev;
	struct v4l2_device v4l2_dev;
	struct snd_tea575x tea;

#ifdef SHARK_USE_LEDS
	struct work_struct led_work;
	struct led_classdev leds[NO_LEDS];
	char led_names[NO_LEDS][32];
	atomic_t brightness[NO_LEDS];
	unsigned long brightness_new;
#endif

	u8 *transfer_buffer;
	u32 last_val;
};

static atomic_t shark_instance = ATOMIC_INIT(0);

static void shark_write_val(struct snd_tea575x *tea, u32 val)
{
	struct shark_device *shark = tea->private_data;
	int i, res, actual_len;

	/* Avoid unnecessary (slow) USB transfers */
	if (shark->last_val == val)
		return;

	memset(shark->transfer_buffer, 0, TB_LEN);
	shark->transfer_buffer[0] = 0xc0; /* Write shift register command */
	for (i = 0; i < 4; i++)
		shark->transfer_buffer[i] |= (val >> (24 - i * 8)) & 0xff;

	res = usb_interrupt_msg(shark->usbdev,
				usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
				shark->transfer_buffer, TB_LEN,
				&actual_len, 1000);
	if (res >= 0)
		shark->last_val = val;
	else
		v4l2_err(&shark->v4l2_dev, "set-freq error: %d\n", res);
}

static u32 shark_read_val(struct snd_tea575x *tea)
{
	struct shark_device *shark = tea->private_data;
	int i, res, actual_len;
	u32 val = 0;

	memset(shark->transfer_buffer, 0, TB_LEN);
	shark->transfer_buffer[0] = 0x80;
	res = usb_interrupt_msg(shark->usbdev,
				usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
				shark->transfer_buffer, TB_LEN,
				&actual_len, 1000);
	if (res < 0) {
		v4l2_err(&shark->v4l2_dev, "request-status error: %d\n", res);
		return shark->last_val;
	}

	res = usb_interrupt_msg(shark->usbdev,
				usb_rcvintpipe(shark->usbdev, SHARK_IN_EP),
				shark->transfer_buffer, TB_LEN,
				&actual_len, 1000);
	if (res < 0) {
		v4l2_err(&shark->v4l2_dev, "get-status error: %d\n", res);
		return shark->last_val;
	}

	for (i = 0; i < 4; i++)
		val |= shark->transfer_buffer[i] << (24 - i * 8);

	shark->last_val = val;

	/*
	 * The shark does not allow actually reading the stereo / mono pin :(
	 * So assume that when we're tuned to an FM station and mono has not
	 * been requested, that we're receiving stereo.
	 */
	if (((val & TEA575X_BIT_BAND_MASK) == TEA575X_BIT_BAND_FM) &&
	    !(val & TEA575X_BIT_MONO))
		shark->tea.stereo = true;
	else
		shark->tea.stereo = false;

	return val;
}

static const struct snd_tea575x_ops shark_tea_ops = {
	.write_val = shark_write_val,
	.read_val  = shark_read_val,
};

#ifdef SHARK_USE_LEDS
static void shark_led_work(struct work_struct *work)
{
	struct shark_device *shark =
		container_of(work, struct shark_device, led_work);
	int i, res, brightness, actual_len;

	for (i = 0; i < 3; i++) {
		if (!test_and_clear_bit(i, &shark->brightness_new))
			continue;

		brightness = atomic_read(&shark->brightness[i]);
		memset(shark->transfer_buffer, 0, TB_LEN);
		if (i != RED_LED) {
			shark->transfer_buffer[0] = 0xA0 + i;
			shark->transfer_buffer[1] = brightness;
		} else
			shark->transfer_buffer[0] = brightness ? 0xA9 : 0xA8;
		res = usb_interrupt_msg(shark->usbdev,
					usb_sndintpipe(shark->usbdev, 0x05),
					shark->transfer_buffer, TB_LEN,
					&actual_len, 1000);
		if (res < 0)
			v4l2_err(&shark->v4l2_dev, "set LED %s error: %d\n",
				 shark->led_names[i], res);
	}
}

static void shark_led_set_blue(struct led_classdev *led_cdev,
			       enum led_brightness value)
{
	struct shark_device *shark =
		container_of(led_cdev, struct shark_device, leds[BLUE_LED]);

	atomic_set(&shark->brightness[BLUE_LED], value);
	set_bit(BLUE_LED, &shark->brightness_new);
	clear_bit(BLUE_IS_PULSE, &shark->brightness_new);
	schedule_work(&shark->led_work);
}

static void shark_led_set_blue_pulse(struct led_classdev *led_cdev,
				     enum led_brightness value)
{
	struct shark_device *shark = container_of(led_cdev,
				struct shark_device, leds[BLUE_PULSE_LED]);

	atomic_set(&shark->brightness[BLUE_PULSE_LED], 256 - value);
	set_bit(BLUE_PULSE_LED, &shark->brightness_new);
	set_bit(BLUE_IS_PULSE, &shark->brightness_new);
	schedule_work(&shark->led_work);
}

static void shark_led_set_red(struct led_classdev *led_cdev,
			      enum led_brightness value)
{
	struct shark_device *shark =
		container_of(led_cdev, struct shark_device, leds[RED_LED]);

	atomic_set(&shark->brightness[RED_LED], value);
	set_bit(RED_LED, &shark->brightness_new);
	schedule_work(&shark->led_work);
}

static const struct led_classdev shark_led_templates[NO_LEDS] = {
	[BLUE_LED] = {
		.name		= "%s:blue:",
		.brightness	= LED_OFF,
		.max_brightness = 127,
		.brightness_set = shark_led_set_blue,
	},
	[BLUE_PULSE_LED] = {
		.name		= "%s:blue-pulse:",
		.brightness	= LED_OFF,
		.max_brightness = 255,
		.brightness_set = shark_led_set_blue_pulse,
	},
	[RED_LED] = {
		.name		= "%s:red:",
		.brightness	= LED_OFF,
		.max_brightness = 1,
		.brightness_set = shark_led_set_red,
	},
};

static int shark_register_leds(struct shark_device *shark, struct device *dev)
{
	int i, retval;

	atomic_set(&shark->brightness[BLUE_LED], 127);
	INIT_WORK(&shark->led_work, shark_led_work);
	for (i = 0; i < NO_LEDS; i++) {
		shark->leds[i] = shark_led_templates[i];
		snprintf(shark->led_names[i], sizeof(shark->led_names[0]),
			 shark->leds[i].name, shark->v4l2_dev.name);
		shark->leds[i].name = shark->led_names[i];
		retval = led_classdev_register(dev, &shark->leds[i]);
		if (retval) {
			v4l2_err(&shark->v4l2_dev,
				 "couldn't register led: %s\n",
				 shark->led_names[i]);
			return retval;
		}
	}
	return 0;
}

static void shark_unregister_leds(struct shark_device *shark)
{
	int i;

	for (i = 0; i < NO_LEDS; i++)
		led_classdev_unregister(&shark->leds[i]);

	cancel_work_sync(&shark->led_work);
}

static inline void shark_resume_leds(struct shark_device *shark)
{
	if (test_bit(BLUE_IS_PULSE, &shark->brightness_new))
		set_bit(BLUE_PULSE_LED, &shark->brightness_new);
	else
		set_bit(BLUE_LED, &shark->brightness_new);
	set_bit(RED_LED, &shark->brightness_new);
	schedule_work(&shark->led_work);
}
#else
static int shark_register_leds(struct shark_device *shark, struct device *dev)
{
	v4l2_warn(&shark->v4l2_dev,
		  "CONFIG_LEDS_CLASS not enabled, LED support disabled\n");
	return 0;
}
static inline void shark_unregister_leds(struct shark_device *shark) { }
static inline void shark_resume_leds(struct shark_device *shark) { }
#endif

static void usb_shark_disconnect(struct usb_interface *intf)
{
	struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);
	struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);

	mutex_lock(&shark->tea.mutex);
	v4l2_device_disconnect(&shark->v4l2_dev);
	snd_tea575x_exit(&shark->tea);
	mutex_unlock(&shark->tea.mutex);

	shark_unregister_leds(shark);

	v4l2_device_put(&shark->v4l2_dev);
}

static void usb_shark_release(struct v4l2_device *v4l2_dev)
{
	struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);

	v4l2_device_unregister(&shark->v4l2_dev);
	kfree(shark->transfer_buffer);
	kfree(shark);
}

static int usb_shark_probe(struct usb_interface *intf,
			   const struct usb_device_id *id)
{
	struct shark_device *shark;
	int retval = -ENOMEM;

	shark = kzalloc(sizeof(struct shark_device), GFP_KERNEL);
	if (!shark)
		return retval;

	shark->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
	if (!shark->transfer_buffer)
		goto err_alloc_buffer;

	v4l2_device_set_name(&shark->v4l2_dev, DRV_NAME, &shark_instance);

	retval = shark_register_leds(shark, &intf->dev);
	if (retval)
		goto err_reg_leds;

	shark->v4l2_dev.release = usb_shark_release;
	retval = v4l2_device_register(&intf->dev, &shark->v4l2_dev);
	if (retval) {
		v4l2_err(&shark->v4l2_dev, "couldn't register v4l2_device\n");
		goto err_reg_dev;
	}

	shark->usbdev = interface_to_usbdev(intf);
	shark->tea.v4l2_dev = &shark->v4l2_dev;
	shark->tea.private_data = shark;
	shark->tea.radio_nr = -1;
	shark->tea.ops = &shark_tea_ops;
	shark->tea.cannot_mute = true;
	shark->tea.has_am = true;
	strlcpy(shark->tea.card, "Griffin radioSHARK",
		sizeof(shark->tea.card));
	usb_make_path(shark->usbdev, shark->tea.bus_info,
		sizeof(shark->tea.bus_info));

	retval = snd_tea575x_init(&shark->tea, THIS_MODULE);
	if (retval) {
		v4l2_err(&shark->v4l2_dev, "couldn't init tea5757\n");
		goto err_init_tea;
	}

	return 0;

err_init_tea:
	v4l2_device_unregister(&shark->v4l2_dev);
err_reg_dev:
	shark_unregister_leds(shark);
err_reg_leds:
	kfree(shark->transfer_buffer);
err_alloc_buffer:
	kfree(shark);

	return retval;
}

#ifdef CONFIG_PM
static int usb_shark_suspend(struct usb_interface *intf, pm_message_t message)
{
	return 0;
}

static int usb_shark_resume(struct usb_interface *intf)
{
	struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);
	struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);

	mutex_lock(&shark->tea.mutex);
	snd_tea575x_set_freq(&shark->tea);
	mutex_unlock(&shark->tea.mutex);

	shark_resume_leds(shark);

	return 0;
}
#endif

/* Specify the bcdDevice value, as the radioSHARK and radioSHARK2 share ids */
static const struct usb_device_id usb_shark_device_table[] = {
	{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION |
			 USB_DEVICE_ID_MATCH_INT_CLASS,
	  .idVendor     = 0x077d,
	  .idProduct    = 0x627a,
	  .bcdDevice_lo = 0x0001,
	  .bcdDevice_hi = 0x0001,
	  .bInterfaceClass = 3,
	},
	{ }
};
MODULE_DEVICE_TABLE(usb, usb_shark_device_table);

static struct usb_driver usb_shark_driver = {
	.name			= DRV_NAME,
	.probe			= usb_shark_probe,
	.disconnect		= usb_shark_disconnect,
	.id_table		= usb_shark_device_table,
#ifdef CONFIG_PM
	.suspend		= usb_shark_suspend,
	.resume			= usb_shark_resume,
	.reset_resume		= usb_shark_resume,
#endif
};
module_usb_driver(usb_shark_driver);