1 /*
2  * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
3  *
4  * This program is free software; you may redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; version 2 of the License.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15  * SOFTWARE.
16  */
17 
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/slab.h>
22 #include <linux/input.h>
23 #include <linux/usb.h>
24 #include <linux/hid.h>
25 #include <linux/mutex.h>
26 #include <linux/videodev2.h>
27 #include <asm/unaligned.h>
28 #include <media/v4l2-device.h>
29 #include <media/v4l2-ioctl.h>
30 #include <media/v4l2-ctrls.h>
31 #include <media/v4l2-event.h>
32 
33 /*
34  * 'Thanko's Raremono' is a Japanese si4734-based AM/FM/SW USB receiver:
35  *
36  * http://www.raremono.jp/product/484.html/
37  *
38  * The USB protocol has been reversed engineered using wireshark, initially
39  * by Dinesh Ram <dinesh.ram@cern.ch> and finished by Hans Verkuil
40  * <hverkuil@xs4all.nl>.
41  *
42  * Sadly the firmware used in this product hides lots of goodies since the
43  * si4734 has more features than are supported by the firmware. Oh well...
44  */
45 
46 /* driver and module definitions */
47 MODULE_AUTHOR("Hans Verkuil <hverkuil@xs4all.nl>");
48 MODULE_DESCRIPTION("Thanko's Raremono AM/FM/SW Receiver USB driver");
49 MODULE_LICENSE("GPL v2");
50 
51 /*
52  * The Device announces itself as Cygnal Integrated Products, Inc.
53  *
54  * The vendor and product IDs (and in fact all other lsusb information as
55  * well) are identical to the si470x Silicon Labs USB FM Radio Reference
56  * Design board, even though this card has a si4734 device. Clearly the
57  * designer of this product never bothered to change the USB IDs.
58  */
59 
60 /* USB Device ID List */
61 static struct usb_device_id usb_raremono_device_table[] = {
62 	{USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
63 	{ }						/* Terminating entry */
64 };
65 
66 MODULE_DEVICE_TABLE(usb, usb_raremono_device_table);
67 
68 #define BUFFER_LENGTH 64
69 
70 /* Timeout is set to a high value, could probably be reduced. Need more tests */
71 #define USB_TIMEOUT 10000
72 
73 /* Frequency limits in KHz */
74 #define FM_FREQ_RANGE_LOW	64000
75 #define FM_FREQ_RANGE_HIGH	108000
76 
77 #define AM_FREQ_RANGE_LOW	520
78 #define AM_FREQ_RANGE_HIGH	1710
79 
80 #define SW_FREQ_RANGE_LOW	2300
81 #define SW_FREQ_RANGE_HIGH	26100
82 
83 enum { BAND_FM, BAND_AM, BAND_SW };
84 
85 static const struct v4l2_frequency_band bands[] = {
86 	/* Band FM */
87 	{
88 		.type = V4L2_TUNER_RADIO,
89 		.index = 0,
90 		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
91 			      V4L2_TUNER_CAP_FREQ_BANDS,
92 		.rangelow   = FM_FREQ_RANGE_LOW * 16,
93 		.rangehigh  = FM_FREQ_RANGE_HIGH * 16,
94 		.modulation = V4L2_BAND_MODULATION_FM,
95 	},
96 	/* Band AM */
97 	{
98 		.type = V4L2_TUNER_RADIO,
99 		.index = 1,
100 		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
101 		.rangelow   = AM_FREQ_RANGE_LOW * 16,
102 		.rangehigh  = AM_FREQ_RANGE_HIGH * 16,
103 		.modulation = V4L2_BAND_MODULATION_AM,
104 	},
105 	/* Band SW */
106 	{
107 		.type = V4L2_TUNER_RADIO,
108 		.index = 2,
109 		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
110 		.rangelow   = SW_FREQ_RANGE_LOW * 16,
111 		.rangehigh  = SW_FREQ_RANGE_HIGH * 16,
112 		.modulation = V4L2_BAND_MODULATION_AM,
113 	},
114 };
115 
116 struct raremono_device {
117 	struct usb_device *usbdev;
118 	struct usb_interface *intf;
119 	struct video_device vdev;
120 	struct v4l2_device v4l2_dev;
121 	struct mutex lock;
122 
123 	u8 *buffer;
124 	u32 band;
125 	unsigned curfreq;
126 };
127 
128 static inline struct raremono_device *to_raremono_dev(struct v4l2_device *v4l2_dev)
129 {
130 	return container_of(v4l2_dev, struct raremono_device, v4l2_dev);
131 }
132 
133 /* Set frequency. */
134 static int raremono_cmd_main(struct raremono_device *radio, unsigned band, unsigned freq)
135 {
136 	unsigned band_offset;
137 	int ret;
138 
139 	switch (band) {
140 	case BAND_FM:
141 		band_offset = 1;
142 		freq /= 10;
143 		break;
144 	case BAND_AM:
145 		band_offset = 0;
146 		break;
147 	default:
148 		band_offset = 2;
149 		break;
150 	}
151 	radio->buffer[0] = 0x04 + band_offset;
152 	radio->buffer[1] = freq >> 8;
153 	radio->buffer[2] = freq & 0xff;
154 
155 	ret = usb_control_msg(radio->usbdev, usb_sndctrlpipe(radio->usbdev, 0),
156 			HID_REQ_SET_REPORT,
157 			USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
158 			0x0300 + radio->buffer[0], 2,
159 			radio->buffer, 3, USB_TIMEOUT);
160 
161 	if (ret < 0) {
162 		dev_warn(radio->v4l2_dev.dev, "%s failed (%d)\n", __func__, ret);
163 		return ret;
164 	}
165 	radio->curfreq = (band == BAND_FM) ? freq * 10 : freq;
166 	return 0;
167 }
168 
169 /* Handle unplugging the device.
170  * We call video_unregister_device in any case.
171  * The last function called in this procedure is
172  * usb_raremono_device_release.
173  */
174 static void usb_raremono_disconnect(struct usb_interface *intf)
175 {
176 	struct raremono_device *radio = to_raremono_dev(usb_get_intfdata(intf));
177 
178 	dev_info(&intf->dev, "Thanko's Raremono disconnected\n");
179 
180 	mutex_lock(&radio->lock);
181 	usb_set_intfdata(intf, NULL);
182 	video_unregister_device(&radio->vdev);
183 	v4l2_device_disconnect(&radio->v4l2_dev);
184 	mutex_unlock(&radio->lock);
185 	v4l2_device_put(&radio->v4l2_dev);
186 }
187 
188 /*
189  * Linux Video interface
190  */
191 static int vidioc_querycap(struct file *file, void *priv,
192 					struct v4l2_capability *v)
193 {
194 	struct raremono_device *radio = video_drvdata(file);
195 
196 	strlcpy(v->driver, "radio-raremono", sizeof(v->driver));
197 	strlcpy(v->card, "Thanko's Raremono", sizeof(v->card));
198 	usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
199 	v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
200 	v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
201 	return 0;
202 }
203 
204 static int vidioc_enum_freq_bands(struct file *file, void *priv,
205 		struct v4l2_frequency_band *band)
206 {
207 	if (band->tuner != 0)
208 		return -EINVAL;
209 
210 	if (band->index >= ARRAY_SIZE(bands))
211 		return -EINVAL;
212 
213 	*band = bands[band->index];
214 
215 	return 0;
216 }
217 
218 static int vidioc_g_tuner(struct file *file, void *priv,
219 		struct v4l2_tuner *v)
220 {
221 	struct raremono_device *radio = video_drvdata(file);
222 	int ret;
223 
224 	if (v->index > 0)
225 		return -EINVAL;
226 
227 	strlcpy(v->name, "AM/FM/SW", sizeof(v->name));
228 	v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
229 		V4L2_TUNER_CAP_FREQ_BANDS;
230 	v->rangelow = AM_FREQ_RANGE_LOW * 16;
231 	v->rangehigh = FM_FREQ_RANGE_HIGH * 16;
232 	v->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
233 	v->audmode = (radio->curfreq < FM_FREQ_RANGE_LOW) ?
234 		V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
235 	memset(radio->buffer, 1, BUFFER_LENGTH);
236 	ret = usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
237 			1, 0xa1, 0x030d, 2, radio->buffer, BUFFER_LENGTH, USB_TIMEOUT);
238 
239 	if (ret < 0) {
240 		dev_warn(radio->v4l2_dev.dev, "%s failed (%d)\n", __func__, ret);
241 		return ret;
242 	}
243 	v->signal = ((radio->buffer[1] & 0xf) << 8 | radio->buffer[2]) << 4;
244 	return 0;
245 }
246 
247 static int vidioc_s_tuner(struct file *file, void *priv,
248 					const struct v4l2_tuner *v)
249 {
250 	return v->index ? -EINVAL : 0;
251 }
252 
253 static int vidioc_s_frequency(struct file *file, void *priv,
254 				const struct v4l2_frequency *f)
255 {
256 	struct raremono_device *radio = video_drvdata(file);
257 	u32 freq = f->frequency;
258 	unsigned band;
259 
260 	if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
261 		return -EINVAL;
262 
263 	if (f->frequency >= (FM_FREQ_RANGE_LOW + SW_FREQ_RANGE_HIGH) * 8)
264 		band = BAND_FM;
265 	else if (f->frequency <= (AM_FREQ_RANGE_HIGH + SW_FREQ_RANGE_LOW) * 8)
266 		band = BAND_AM;
267 	else
268 		band = BAND_SW;
269 
270 	freq = clamp_t(u32, f->frequency, bands[band].rangelow, bands[band].rangehigh);
271 	return raremono_cmd_main(radio, band, freq / 16);
272 }
273 
274 static int vidioc_g_frequency(struct file *file, void *priv,
275 				struct v4l2_frequency *f)
276 {
277 	struct raremono_device *radio = video_drvdata(file);
278 
279 	if (f->tuner != 0)
280 		return -EINVAL;
281 	f->type = V4L2_TUNER_RADIO;
282 	f->frequency = radio->curfreq * 16;
283 	return 0;
284 }
285 
286 /* File system interface */
287 static const struct v4l2_file_operations usb_raremono_fops = {
288 	.owner		= THIS_MODULE,
289 	.open           = v4l2_fh_open,
290 	.release        = v4l2_fh_release,
291 	.unlocked_ioctl	= video_ioctl2,
292 };
293 
294 static const struct v4l2_ioctl_ops usb_raremono_ioctl_ops = {
295 	.vidioc_querycap = vidioc_querycap,
296 	.vidioc_g_tuner = vidioc_g_tuner,
297 	.vidioc_s_tuner = vidioc_s_tuner,
298 	.vidioc_g_frequency = vidioc_g_frequency,
299 	.vidioc_s_frequency = vidioc_s_frequency,
300 	.vidioc_enum_freq_bands = vidioc_enum_freq_bands,
301 };
302 
303 /* check if the device is present and register with v4l and usb if it is */
304 static int usb_raremono_probe(struct usb_interface *intf,
305 				const struct usb_device_id *id)
306 {
307 	struct raremono_device *radio;
308 	int retval = 0;
309 
310 	radio = devm_kzalloc(&intf->dev, sizeof(struct raremono_device), GFP_KERNEL);
311 	if (radio)
312 		radio->buffer = devm_kmalloc(&intf->dev, BUFFER_LENGTH, GFP_KERNEL);
313 
314 	if (!radio || !radio->buffer)
315 		return -ENOMEM;
316 
317 	radio->usbdev = interface_to_usbdev(intf);
318 	radio->intf = intf;
319 
320 	/*
321 	 * This device uses the same USB IDs as the si470x SiLabs reference
322 	 * design. So do an additional check: attempt to read the device ID
323 	 * from the si470x: the lower 12 bits are 0x0242 for the si470x. The
324 	 * Raremono always returns 0x0800 (the meaning of that is unknown, but
325 	 * at least it works).
326 	 *
327 	 * We use this check to determine which device we are dealing with.
328 	 */
329 	msleep(20);
330 	retval = usb_control_msg(radio->usbdev,
331 		usb_rcvctrlpipe(radio->usbdev, 0),
332 		HID_REQ_GET_REPORT,
333 		USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
334 		1, 2,
335 		radio->buffer, 3, 500);
336 	if (retval != 3 ||
337 	    (get_unaligned_be16(&radio->buffer[1]) & 0xfff) == 0x0242) {
338 		dev_info(&intf->dev, "this is not Thanko's Raremono.\n");
339 		return -ENODEV;
340 	}
341 
342 	dev_info(&intf->dev, "Thanko's Raremono connected: (%04X:%04X)\n",
343 			id->idVendor, id->idProduct);
344 
345 	retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
346 	if (retval < 0) {
347 		dev_err(&intf->dev, "couldn't register v4l2_device\n");
348 		return retval;
349 	}
350 
351 	mutex_init(&radio->lock);
352 
353 	strlcpy(radio->vdev.name, radio->v4l2_dev.name,
354 		sizeof(radio->vdev.name));
355 	radio->vdev.v4l2_dev = &radio->v4l2_dev;
356 	radio->vdev.fops = &usb_raremono_fops;
357 	radio->vdev.ioctl_ops = &usb_raremono_ioctl_ops;
358 	radio->vdev.lock = &radio->lock;
359 	radio->vdev.release = video_device_release_empty;
360 
361 	usb_set_intfdata(intf, &radio->v4l2_dev);
362 
363 	video_set_drvdata(&radio->vdev, radio);
364 
365 	raremono_cmd_main(radio, BAND_FM, 95160);
366 
367 	retval = video_register_device(&radio->vdev, VFL_TYPE_RADIO, -1);
368 	if (retval == 0) {
369 		dev_info(&intf->dev, "V4L2 device registered as %s\n",
370 				video_device_node_name(&radio->vdev));
371 		return 0;
372 	}
373 	dev_err(&intf->dev, "could not register video device\n");
374 	v4l2_device_unregister(&radio->v4l2_dev);
375 	return retval;
376 }
377 
378 /* USB subsystem interface */
379 static struct usb_driver usb_raremono_driver = {
380 	.name			= "radio-raremono",
381 	.probe			= usb_raremono_probe,
382 	.disconnect		= usb_raremono_disconnect,
383 	.id_table		= usb_raremono_device_table,
384 };
385 
386 module_usb_driver(usb_raremono_driver);
387