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8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/usb.h>
11#include <linux/init.h>
12#include <linux/slab.h>
13#include <linux/input.h>
14#include <linux/mutex.h>
15#include <linux/i2c.h>
16
17#include <linux/videodev2.h>
18#include <media/v4l2-common.h>
19#include <media/v4l2-device.h>
20#include <media/v4l2-ioctl.h>
21#include <media/v4l2-event.h>
22#include <linux/platform_data/media/si4713.h>
23
24#include "si4713.h"
25
26
27MODULE_AUTHOR("Dinesh Ram <dinesh.ram@cern.ch>");
28MODULE_DESCRIPTION("Si4713 FM Transmitter USB driver");
29MODULE_LICENSE("GPL v2");
30
31
32#define USB_SI4713_VENDOR 0x10c4
33#define USB_SI4713_PRODUCT 0x8244
34
35#define BUFFER_LENGTH 64
36#define USB_TIMEOUT 1000
37#define USB_RESP_TIMEOUT 50000
38
39
40static const struct usb_device_id usb_si4713_usb_device_table[] = {
41 {USB_DEVICE_AND_INTERFACE_INFO(USB_SI4713_VENDOR, USB_SI4713_PRODUCT,
42 USB_CLASS_HID, 0, 0) },
43 { }
44};
45
46MODULE_DEVICE_TABLE(usb, usb_si4713_usb_device_table);
47
48struct si4713_usb_device {
49 struct usb_device *usbdev;
50 struct usb_interface *intf;
51 struct video_device vdev;
52 struct v4l2_device v4l2_dev;
53 struct v4l2_subdev *v4l2_subdev;
54 struct mutex lock;
55 struct i2c_adapter i2c_adapter;
56
57 u8 *buffer;
58};
59
60static inline struct si4713_usb_device *to_si4713_dev(struct v4l2_device *v4l2_dev)
61{
62 return container_of(v4l2_dev, struct si4713_usb_device, v4l2_dev);
63}
64
65static int vidioc_querycap(struct file *file, void *priv,
66 struct v4l2_capability *v)
67{
68 struct si4713_usb_device *radio = video_drvdata(file);
69
70 strlcpy(v->driver, "radio-usb-si4713", sizeof(v->driver));
71 strlcpy(v->card, "Si4713 FM Transmitter", sizeof(v->card));
72 usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
73 v->device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
74 v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
75
76 return 0;
77}
78
79static int vidioc_g_modulator(struct file *file, void *priv,
80 struct v4l2_modulator *vm)
81{
82 struct si4713_usb_device *radio = video_drvdata(file);
83
84 return v4l2_subdev_call(radio->v4l2_subdev, tuner, g_modulator, vm);
85}
86
87static int vidioc_s_modulator(struct file *file, void *priv,
88 const struct v4l2_modulator *vm)
89{
90 struct si4713_usb_device *radio = video_drvdata(file);
91
92 return v4l2_subdev_call(radio->v4l2_subdev, tuner, s_modulator, vm);
93}
94
95static int vidioc_s_frequency(struct file *file, void *priv,
96 const struct v4l2_frequency *vf)
97{
98 struct si4713_usb_device *radio = video_drvdata(file);
99
100 return v4l2_subdev_call(radio->v4l2_subdev, tuner, s_frequency, vf);
101}
102
103static int vidioc_g_frequency(struct file *file, void *priv,
104 struct v4l2_frequency *vf)
105{
106 struct si4713_usb_device *radio = video_drvdata(file);
107
108 return v4l2_subdev_call(radio->v4l2_subdev, tuner, g_frequency, vf);
109}
110
111static const struct v4l2_ioctl_ops usb_si4713_ioctl_ops = {
112 .vidioc_querycap = vidioc_querycap,
113 .vidioc_g_modulator = vidioc_g_modulator,
114 .vidioc_s_modulator = vidioc_s_modulator,
115 .vidioc_g_frequency = vidioc_g_frequency,
116 .vidioc_s_frequency = vidioc_s_frequency,
117 .vidioc_log_status = v4l2_ctrl_log_status,
118 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
119 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
120};
121
122
123static const struct v4l2_file_operations usb_si4713_fops = {
124 .owner = THIS_MODULE,
125 .open = v4l2_fh_open,
126 .release = v4l2_fh_release,
127 .poll = v4l2_ctrl_poll,
128 .unlocked_ioctl = video_ioctl2,
129};
130
131static void usb_si4713_video_device_release(struct v4l2_device *v4l2_dev)
132{
133 struct si4713_usb_device *radio = to_si4713_dev(v4l2_dev);
134 struct i2c_adapter *adapter = &radio->i2c_adapter;
135
136 i2c_del_adapter(adapter);
137 v4l2_device_unregister(&radio->v4l2_dev);
138 kfree(radio->buffer);
139 kfree(radio);
140}
141
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152
153
154
155static int si4713_send_startup_command(struct si4713_usb_device *radio)
156{
157 unsigned long until_jiffies = jiffies + usecs_to_jiffies(USB_RESP_TIMEOUT) + 1;
158 u8 *buffer = radio->buffer;
159 int retval;
160
161
162 retval = usb_control_msg(radio->usbdev, usb_sndctrlpipe(radio->usbdev, 0),
163 0x09, 0x21, 0x033f, 0, radio->buffer,
164 BUFFER_LENGTH, USB_TIMEOUT);
165 if (retval < 0)
166 return retval;
167
168 for (;;) {
169
170 retval = usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
171 0x01, 0xa1, 0x033f, 0, radio->buffer,
172 BUFFER_LENGTH, USB_TIMEOUT);
173 if (retval < 0)
174 return retval;
175 if (!radio->buffer[1]) {
176
177
178 switch (buffer[1]) {
179 case 0x32:
180 if (radio->buffer[2] == 0)
181 return 0;
182 break;
183 case 0x14:
184 case 0x12:
185 if (radio->buffer[2] & SI4713_CTS)
186 return 0;
187 break;
188 case 0x06:
189 if ((radio->buffer[2] & SI4713_CTS) && radio->buffer[9] == 0x08)
190 return 0;
191 break;
192 default:
193 return 0;
194 }
195 }
196 if (time_is_before_jiffies(until_jiffies))
197 return -EIO;
198 msleep(3);
199 }
200
201 return retval;
202}
203
204struct si4713_start_seq_table {
205 int len;
206 u8 payload[8];
207};
208
209
210
211
212
213
214static const struct si4713_start_seq_table start_seq[] = {
215
216 { 1, { 0x03 } },
217 { 2, { 0x32, 0x7f } },
218 { 6, { 0x06, 0x03, 0x03, 0x08, 0x01, 0x0f } },
219 { 2, { 0x14, 0x02 } },
220 { 2, { 0x09, 0x90 } },
221 { 3, { 0x08, 0x90, 0xfa } },
222 { 2, { 0x36, 0x01 } },
223 { 2, { 0x05, 0x03 } },
224 { 7, { 0x06, 0x00, 0x06, 0x0e, 0x01, 0x0f, 0x05 } },
225 { 1, { 0x12 } },
226
227
228 { 1, { 0x03 } },
229 { 1, { 0x01 } },
230 { 2, { 0x09, 0x90 } },
231 { 3, { 0x08, 0x90, 0xfa } },
232 { 1, { 0x34 } },
233 { 2, { 0x35, 0x01 } },
234 { 2, { 0x36, 0x01 } },
235 { 2, { 0x30, 0x09 } },
236 { 4, { 0x30, 0x06, 0x00, 0xe2 } },
237 { 3, { 0x31, 0x01, 0x30 } },
238 { 3, { 0x31, 0x04, 0x09 } },
239 { 2, { 0x05, 0x02 } },
240 { 6, { 0x06, 0x03, 0x03, 0x08, 0x01, 0x0f } },
241};
242
243static int si4713_start_seq(struct si4713_usb_device *radio)
244{
245 int retval = 0;
246 int i;
247
248 radio->buffer[0] = 0x3f;
249
250 for (i = 0; i < ARRAY_SIZE(start_seq); i++) {
251 int len = start_seq[i].len;
252 const u8 *payload = start_seq[i].payload;
253
254 memcpy(radio->buffer + 1, payload, len);
255 memset(radio->buffer + len + 1, 0, BUFFER_LENGTH - 1 - len);
256 retval = si4713_send_startup_command(radio);
257 }
258
259 return retval;
260}
261
262static struct i2c_board_info si4713_board_info = {
263 I2C_BOARD_INFO("si4713", SI4713_I2C_ADDR_BUSEN_HIGH),
264};
265
266struct si4713_command_table {
267 int command_id;
268 u8 payload[8];
269};
270
271
272
273
274
275
276
277
278
279static struct si4713_command_table command_table[] = {
280
281 { SI4713_CMD_POWER_UP, { 0x00, SI4713_PWUP_NARGS + 1, SI4713_PWUP_NRESP} },
282 { SI4713_CMD_GET_REV, { 0x03, 0x01, SI4713_GETREV_NRESP } },
283 { SI4713_CMD_POWER_DOWN, { 0x00, 0x01, SI4713_PWDN_NRESP} },
284 { SI4713_CMD_SET_PROPERTY, { 0x00, SI4713_SET_PROP_NARGS + 1, SI4713_SET_PROP_NRESP } },
285 { SI4713_CMD_GET_PROPERTY, { 0x00, SI4713_GET_PROP_NARGS + 1, SI4713_GET_PROP_NRESP } },
286 { SI4713_CMD_TX_TUNE_FREQ, { 0x03, SI4713_TXFREQ_NARGS + 1, SI4713_TXFREQ_NRESP } },
287 { SI4713_CMD_TX_TUNE_POWER, { 0x03, SI4713_TXPWR_NARGS + 1, SI4713_TXPWR_NRESP } },
288 { SI4713_CMD_TX_TUNE_MEASURE, { 0x03, SI4713_TXMEA_NARGS + 1, SI4713_TXMEA_NRESP } },
289 { SI4713_CMD_TX_TUNE_STATUS, { 0x00, SI4713_TXSTATUS_NARGS + 1, SI4713_TXSTATUS_NRESP } },
290 { SI4713_CMD_TX_ASQ_STATUS, { 0x03, SI4713_ASQSTATUS_NARGS + 1, SI4713_ASQSTATUS_NRESP } },
291 { SI4713_CMD_GET_INT_STATUS, { 0x03, 0x01, SI4713_GET_STATUS_NRESP } },
292 { SI4713_CMD_TX_RDS_BUFF, { 0x03, SI4713_RDSBUFF_NARGS + 1, SI4713_RDSBUFF_NRESP } },
293 { SI4713_CMD_TX_RDS_PS, { 0x00, SI4713_RDSPS_NARGS + 1, SI4713_RDSPS_NRESP } },
294};
295
296static int send_command(struct si4713_usb_device *radio, u8 *payload, char *data, int len)
297{
298 int retval;
299
300 radio->buffer[0] = 0x3f;
301 radio->buffer[1] = 0x06;
302
303 memcpy(radio->buffer + 2, payload, 3);
304 memcpy(radio->buffer + 5, data, len);
305 memset(radio->buffer + 5 + len, 0, BUFFER_LENGTH - 5 - len);
306
307
308 retval = usb_control_msg(radio->usbdev, usb_sndctrlpipe(radio->usbdev, 0),
309 0x09, 0x21, 0x033f, 0, radio->buffer,
310 BUFFER_LENGTH, USB_TIMEOUT);
311
312 return retval < 0 ? retval : 0;
313}
314
315static int si4713_i2c_read(struct si4713_usb_device *radio, char *data, int len)
316{
317 unsigned long until_jiffies = jiffies + usecs_to_jiffies(USB_RESP_TIMEOUT) + 1;
318 int retval;
319
320
321 for (;;) {
322 retval = usb_control_msg(radio->usbdev,
323 usb_rcvctrlpipe(radio->usbdev, 0),
324 0x01, 0xa1, 0x033f, 0, radio->buffer,
325 BUFFER_LENGTH, USB_TIMEOUT);
326 if (retval < 0)
327 return retval;
328
329
330
331
332
333
334
335
336 if (radio->buffer[1] == 0 && (radio->buffer[2] & SI4713_CTS)) {
337 memcpy(data, radio->buffer + 2, len);
338 return 0;
339 }
340 if (time_is_before_jiffies(until_jiffies)) {
341
342 data[0] = 0;
343 return 0;
344 }
345 msleep(3);
346 }
347}
348
349static int si4713_i2c_write(struct si4713_usb_device *radio, char *data, int len)
350{
351 int retval = -EINVAL;
352 int i;
353
354 if (len > BUFFER_LENGTH - 5)
355 return -EINVAL;
356
357 for (i = 0; i < ARRAY_SIZE(command_table); i++) {
358 if (data[0] == command_table[i].command_id)
359 retval = send_command(radio, command_table[i].payload,
360 data, len);
361 }
362
363 return retval < 0 ? retval : 0;
364}
365
366static int si4713_transfer(struct i2c_adapter *i2c_adapter,
367 struct i2c_msg *msgs, int num)
368{
369 struct si4713_usb_device *radio = i2c_get_adapdata(i2c_adapter);
370 int retval = -EINVAL;
371 int i;
372
373 if (num <= 0)
374 return 0;
375
376 for (i = 0; i < num; i++) {
377 if (msgs[i].flags & I2C_M_RD)
378 retval = si4713_i2c_read(radio, msgs[i].buf, msgs[i].len);
379 else
380 retval = si4713_i2c_write(radio, msgs[i].buf, msgs[i].len);
381 if (retval)
382 break;
383 }
384
385 return retval ? retval : num;
386}
387
388static u32 si4713_functionality(struct i2c_adapter *adapter)
389{
390 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
391}
392
393static const struct i2c_algorithm si4713_algo = {
394 .master_xfer = si4713_transfer,
395 .functionality = si4713_functionality,
396};
397
398
399
400static const struct i2c_adapter si4713_i2c_adapter_template = {
401 .name = "si4713-i2c",
402 .owner = THIS_MODULE,
403 .algo = &si4713_algo,
404};
405
406static int si4713_register_i2c_adapter(struct si4713_usb_device *radio)
407{
408 radio->i2c_adapter = si4713_i2c_adapter_template;
409
410 radio->i2c_adapter.dev.parent = &radio->usbdev->dev;
411 i2c_set_adapdata(&radio->i2c_adapter, radio);
412
413 return i2c_add_adapter(&radio->i2c_adapter);
414}
415
416
417static int usb_si4713_probe(struct usb_interface *intf,
418 const struct usb_device_id *id)
419{
420 struct si4713_usb_device *radio;
421 struct i2c_adapter *adapter;
422 struct v4l2_subdev *sd;
423 int retval = -ENOMEM;
424
425 dev_info(&intf->dev, "Si4713 development board discovered: (%04X:%04X)\n",
426 id->idVendor, id->idProduct);
427
428
429 radio = kzalloc(sizeof(struct si4713_usb_device), GFP_KERNEL);
430 if (radio)
431 radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
432
433 if (!radio || !radio->buffer) {
434 dev_err(&intf->dev, "kmalloc for si4713_usb_device failed\n");
435 kfree(radio);
436 return -ENOMEM;
437 }
438
439 mutex_init(&radio->lock);
440
441 radio->usbdev = interface_to_usbdev(intf);
442 radio->intf = intf;
443 usb_set_intfdata(intf, &radio->v4l2_dev);
444
445 retval = si4713_start_seq(radio);
446 if (retval < 0)
447 goto err_v4l2;
448
449 retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
450 if (retval < 0) {
451 dev_err(&intf->dev, "couldn't register v4l2_device\n");
452 goto err_v4l2;
453 }
454
455 retval = si4713_register_i2c_adapter(radio);
456 if (retval < 0) {
457 dev_err(&intf->dev, "could not register i2c device\n");
458 goto err_i2cdev;
459 }
460
461 adapter = &radio->i2c_adapter;
462 sd = v4l2_i2c_new_subdev_board(&radio->v4l2_dev, adapter,
463 &si4713_board_info, NULL);
464 radio->v4l2_subdev = sd;
465 if (!sd) {
466 dev_err(&intf->dev, "cannot get v4l2 subdevice\n");
467 retval = -ENODEV;
468 goto del_adapter;
469 }
470
471 radio->vdev.ctrl_handler = sd->ctrl_handler;
472 radio->v4l2_dev.release = usb_si4713_video_device_release;
473 strlcpy(radio->vdev.name, radio->v4l2_dev.name,
474 sizeof(radio->vdev.name));
475 radio->vdev.v4l2_dev = &radio->v4l2_dev;
476 radio->vdev.fops = &usb_si4713_fops;
477 radio->vdev.ioctl_ops = &usb_si4713_ioctl_ops;
478 radio->vdev.lock = &radio->lock;
479 radio->vdev.release = video_device_release_empty;
480 radio->vdev.vfl_dir = VFL_DIR_TX;
481
482 video_set_drvdata(&radio->vdev, radio);
483
484 retval = video_register_device(&radio->vdev, VFL_TYPE_RADIO, -1);
485 if (retval < 0) {
486 dev_err(&intf->dev, "could not register video device\n");
487 goto del_adapter;
488 }
489
490 dev_info(&intf->dev, "V4L2 device registered as %s\n",
491 video_device_node_name(&radio->vdev));
492
493 return 0;
494
495del_adapter:
496 i2c_del_adapter(adapter);
497err_i2cdev:
498 v4l2_device_unregister(&radio->v4l2_dev);
499err_v4l2:
500 kfree(radio->buffer);
501 kfree(radio);
502 return retval;
503}
504
505static void usb_si4713_disconnect(struct usb_interface *intf)
506{
507 struct si4713_usb_device *radio = to_si4713_dev(usb_get_intfdata(intf));
508
509 dev_info(&intf->dev, "Si4713 development board now disconnected\n");
510
511 mutex_lock(&radio->lock);
512 usb_set_intfdata(intf, NULL);
513 video_unregister_device(&radio->vdev);
514 v4l2_device_disconnect(&radio->v4l2_dev);
515 mutex_unlock(&radio->lock);
516 v4l2_device_put(&radio->v4l2_dev);
517}
518
519
520static struct usb_driver usb_si4713_driver = {
521 .name = "radio-usb-si4713",
522 .probe = usb_si4713_probe,
523 .disconnect = usb_si4713_disconnect,
524 .id_table = usb_si4713_usb_device_table,
525};
526
527module_usb_driver(usb_si4713_driver);
528