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30#include <linux/kernel.h>
31#include <linux/slab.h>
32#include <linux/module.h>
33#include <linux/init.h>
34#include <linux/videodev2.h>
35#include <linux/i2c.h>
36#include <media/v4l2-common.h>
37#include <media/v4l2-ioctl.h>
38#include <media/v4l2-device.h>
39#include <media/v4l2-ctrls.h>
40#include <media/v4l2-event.h>
41
42#define DRIVER_VERSION "0.0.2"
43
44#define DRIVER_AUTHOR "Fabio Belavenuto <belavenuto@gmail.com>"
45#define DRIVER_DESC "A driver for the TEA5764 radio chip for EZX Phones."
46
47#define PINFO(format, ...)\
48 printk(KERN_INFO KBUILD_MODNAME ": "\
49 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
50#define PWARN(format, ...)\
51 printk(KERN_WARNING KBUILD_MODNAME ": "\
52 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
53# define PDEBUG(format, ...)\
54 printk(KERN_DEBUG KBUILD_MODNAME ": "\
55 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
56
57
58
59#define FREQ_MIN 87500U
60#define FREQ_MAX 108000U
61#define FREQ_MUL 16
62
63
64#define TEA5764_MANID 0x002b
65#define TEA5764_CHIPID 0x5764
66
67#define TEA5764_INTREG_BLMSK 0x0001
68#define TEA5764_INTREG_FRRMSK 0x0002
69#define TEA5764_INTREG_LEVMSK 0x0008
70#define TEA5764_INTREG_IFMSK 0x0010
71#define TEA5764_INTREG_BLMFLAG 0x0100
72#define TEA5764_INTREG_FRRFLAG 0x0200
73#define TEA5764_INTREG_LEVFLAG 0x0800
74#define TEA5764_INTREG_IFFLAG 0x1000
75
76#define TEA5764_FRQSET_SUD 0x8000
77#define TEA5764_FRQSET_SM 0x4000
78
79#define TEA5764_TNCTRL_PUPD1 0x8000
80#define TEA5764_TNCTRL_PUPD0 0x4000
81#define TEA5764_TNCTRL_BLIM 0x2000
82#define TEA5764_TNCTRL_SWPM 0x1000
83#define TEA5764_TNCTRL_IFCTC 0x0800
84#define TEA5764_TNCTRL_AFM 0x0400
85#define TEA5764_TNCTRL_SMUTE 0x0200
86#define TEA5764_TNCTRL_SNC 0x0100
87#define TEA5764_TNCTRL_MU 0x0080
88#define TEA5764_TNCTRL_SSL1 0x0040
89#define TEA5764_TNCTRL_SSL0 0x0020
90#define TEA5764_TNCTRL_HLSI 0x0010
91#define TEA5764_TNCTRL_MST 0x0008
92#define TEA5764_TNCTRL_SWP 0x0004
93#define TEA5764_TNCTRL_DTC 0x0002
94#define TEA5764_TNCTRL_AHLSI 0x0001
95
96#define TEA5764_TUNCHK_LEVEL(x) (((x) & 0x00F0) >> 4)
97#define TEA5764_TUNCHK_IFCNT(x) (((x) & 0xFE00) >> 9)
98#define TEA5764_TUNCHK_TUNTO 0x0100
99#define TEA5764_TUNCHK_LD 0x0008
100#define TEA5764_TUNCHK_STEREO 0x0004
101
102#define TEA5764_TESTREG_TRIGFR 0x0800
103
104struct tea5764_regs {
105 u16 intreg;
106 u16 frqset;
107 u16 tnctrl;
108 u16 frqchk;
109 u16 tunchk;
110 u16 testreg;
111 u16 rdsstat;
112 u16 rdslb;
113 u16 rdspb;
114 u16 rdsbc;
115 u16 rdsctrl;
116 u16 rdsbbl;
117 u16 manid;
118 u16 chipid;
119} __attribute__ ((packed));
120
121struct tea5764_write_regs {
122 u8 intreg;
123 __be16 frqset;
124 __be16 tnctrl;
125 __be16 testreg;
126 __be16 rdsctrl;
127 __be16 rdsbbl;
128} __attribute__ ((packed));
129
130#ifdef CONFIG_RADIO_TEA5764_XTAL
131#define RADIO_TEA5764_XTAL 1
132#else
133#define RADIO_TEA5764_XTAL 0
134#endif
135
136static int radio_nr = -1;
137static int use_xtal = RADIO_TEA5764_XTAL;
138
139struct tea5764_device {
140 struct v4l2_device v4l2_dev;
141 struct v4l2_ctrl_handler ctrl_handler;
142 struct i2c_client *i2c_client;
143 struct video_device vdev;
144 struct tea5764_regs regs;
145 struct mutex mutex;
146};
147
148
149static int tea5764_i2c_read(struct tea5764_device *radio)
150{
151 int i;
152 u16 *p = (u16 *) &radio->regs;
153
154 struct i2c_msg msgs[1] = {
155 { .addr = radio->i2c_client->addr,
156 .flags = I2C_M_RD,
157 .len = sizeof(radio->regs),
158 .buf = (void *)&radio->regs
159 },
160 };
161 if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
162 return -EIO;
163 for (i = 0; i < sizeof(struct tea5764_regs) / sizeof(u16); i++)
164 p[i] = __be16_to_cpu((__force __be16)p[i]);
165
166 return 0;
167}
168
169static int tea5764_i2c_write(struct tea5764_device *radio)
170{
171 struct tea5764_write_regs wr;
172 struct tea5764_regs *r = &radio->regs;
173 struct i2c_msg msgs[1] = {
174 {
175 .addr = radio->i2c_client->addr,
176 .len = sizeof(wr),
177 .buf = (void *)&wr
178 },
179 };
180 wr.intreg = r->intreg & 0xff;
181 wr.frqset = __cpu_to_be16(r->frqset);
182 wr.tnctrl = __cpu_to_be16(r->tnctrl);
183 wr.testreg = __cpu_to_be16(r->testreg);
184 wr.rdsctrl = __cpu_to_be16(r->rdsctrl);
185 wr.rdsbbl = __cpu_to_be16(r->rdsbbl);
186 if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
187 return -EIO;
188 return 0;
189}
190
191static void tea5764_power_up(struct tea5764_device *radio)
192{
193 struct tea5764_regs *r = &radio->regs;
194
195 if (!(r->tnctrl & TEA5764_TNCTRL_PUPD0)) {
196 r->tnctrl &= ~(TEA5764_TNCTRL_AFM | TEA5764_TNCTRL_MU |
197 TEA5764_TNCTRL_HLSI);
198 if (!use_xtal)
199 r->testreg |= TEA5764_TESTREG_TRIGFR;
200 else
201 r->testreg &= ~TEA5764_TESTREG_TRIGFR;
202
203 r->tnctrl |= TEA5764_TNCTRL_PUPD0;
204 tea5764_i2c_write(radio);
205 }
206}
207
208static void tea5764_power_down(struct tea5764_device *radio)
209{
210 struct tea5764_regs *r = &radio->regs;
211
212 if (r->tnctrl & TEA5764_TNCTRL_PUPD0) {
213 r->tnctrl &= ~TEA5764_TNCTRL_PUPD0;
214 tea5764_i2c_write(radio);
215 }
216}
217
218static void tea5764_set_freq(struct tea5764_device *radio, int freq)
219{
220 struct tea5764_regs *r = &radio->regs;
221
222
223 if (r->tnctrl & TEA5764_TNCTRL_HLSI)
224 r->frqset = (freq + 225000) / 8192;
225 else
226 r->frqset = (freq - 225000) / 8192;
227}
228
229static int tea5764_get_freq(struct tea5764_device *radio)
230{
231 struct tea5764_regs *r = &radio->regs;
232
233 if (r->tnctrl & TEA5764_TNCTRL_HLSI)
234 return (r->frqchk * 8192) - 225000;
235 else
236 return (r->frqchk * 8192) + 225000;
237}
238
239
240static void tea5764_tune(struct tea5764_device *radio, int freq)
241{
242 tea5764_set_freq(radio, freq);
243 if (tea5764_i2c_write(radio))
244 PWARN("Could not set frequency!");
245}
246
247static void tea5764_set_audout_mode(struct tea5764_device *radio, int audmode)
248{
249 struct tea5764_regs *r = &radio->regs;
250 int tnctrl = r->tnctrl;
251
252 if (audmode == V4L2_TUNER_MODE_MONO)
253 r->tnctrl |= TEA5764_TNCTRL_MST;
254 else
255 r->tnctrl &= ~TEA5764_TNCTRL_MST;
256 if (tnctrl != r->tnctrl)
257 tea5764_i2c_write(radio);
258}
259
260static int tea5764_get_audout_mode(struct tea5764_device *radio)
261{
262 struct tea5764_regs *r = &radio->regs;
263
264 if (r->tnctrl & TEA5764_TNCTRL_MST)
265 return V4L2_TUNER_MODE_MONO;
266 else
267 return V4L2_TUNER_MODE_STEREO;
268}
269
270static void tea5764_mute(struct tea5764_device *radio, int on)
271{
272 struct tea5764_regs *r = &radio->regs;
273 int tnctrl = r->tnctrl;
274
275 if (on)
276 r->tnctrl |= TEA5764_TNCTRL_MU;
277 else
278 r->tnctrl &= ~TEA5764_TNCTRL_MU;
279 if (tnctrl != r->tnctrl)
280 tea5764_i2c_write(radio);
281}
282
283
284static int vidioc_querycap(struct file *file, void *priv,
285 struct v4l2_capability *v)
286{
287 struct tea5764_device *radio = video_drvdata(file);
288 struct video_device *dev = &radio->vdev;
289
290 strlcpy(v->driver, dev->dev.driver->name, sizeof(v->driver));
291 strlcpy(v->card, dev->name, sizeof(v->card));
292 snprintf(v->bus_info, sizeof(v->bus_info),
293 "I2C:%s", dev_name(&dev->dev));
294 v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
295 v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
296 return 0;
297}
298
299static int vidioc_g_tuner(struct file *file, void *priv,
300 struct v4l2_tuner *v)
301{
302 struct tea5764_device *radio = video_drvdata(file);
303 struct tea5764_regs *r = &radio->regs;
304
305 if (v->index > 0)
306 return -EINVAL;
307
308 strlcpy(v->name, "FM", sizeof(v->name));
309 v->type = V4L2_TUNER_RADIO;
310 tea5764_i2c_read(radio);
311 v->rangelow = FREQ_MIN * FREQ_MUL;
312 v->rangehigh = FREQ_MAX * FREQ_MUL;
313 v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
314 if (r->tunchk & TEA5764_TUNCHK_STEREO)
315 v->rxsubchans = V4L2_TUNER_SUB_STEREO;
316 else
317 v->rxsubchans = V4L2_TUNER_SUB_MONO;
318 v->audmode = tea5764_get_audout_mode(radio);
319 v->signal = TEA5764_TUNCHK_LEVEL(r->tunchk) * 0xffff / 0xf;
320 v->afc = TEA5764_TUNCHK_IFCNT(r->tunchk);
321
322 return 0;
323}
324
325static int vidioc_s_tuner(struct file *file, void *priv,
326 const struct v4l2_tuner *v)
327{
328 struct tea5764_device *radio = video_drvdata(file);
329
330 if (v->index > 0)
331 return -EINVAL;
332
333 tea5764_set_audout_mode(radio, v->audmode);
334 return 0;
335}
336
337static int vidioc_s_frequency(struct file *file, void *priv,
338 const struct v4l2_frequency *f)
339{
340 struct tea5764_device *radio = video_drvdata(file);
341 unsigned freq = f->frequency;
342
343 if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
344 return -EINVAL;
345 if (freq == 0) {
346
347 tea5764_power_down(radio);
348
349
350
351
352
353 return -EINVAL;
354 }
355 freq = clamp(freq, FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL);
356 tea5764_power_up(radio);
357 tea5764_tune(radio, (freq * 125) / 2);
358 return 0;
359}
360
361static int vidioc_g_frequency(struct file *file, void *priv,
362 struct v4l2_frequency *f)
363{
364 struct tea5764_device *radio = video_drvdata(file);
365 struct tea5764_regs *r = &radio->regs;
366
367 if (f->tuner != 0)
368 return -EINVAL;
369 tea5764_i2c_read(radio);
370 f->type = V4L2_TUNER_RADIO;
371 if (r->tnctrl & TEA5764_TNCTRL_PUPD0)
372 f->frequency = (tea5764_get_freq(radio) * 2) / 125;
373 else
374 f->frequency = 0;
375
376 return 0;
377}
378
379static int tea5764_s_ctrl(struct v4l2_ctrl *ctrl)
380{
381 struct tea5764_device *radio =
382 container_of(ctrl->handler, struct tea5764_device, ctrl_handler);
383
384 switch (ctrl->id) {
385 case V4L2_CID_AUDIO_MUTE:
386 tea5764_mute(radio, ctrl->val);
387 return 0;
388 }
389 return -EINVAL;
390}
391
392static const struct v4l2_ctrl_ops tea5764_ctrl_ops = {
393 .s_ctrl = tea5764_s_ctrl,
394};
395
396
397static const struct v4l2_file_operations tea5764_fops = {
398 .owner = THIS_MODULE,
399 .open = v4l2_fh_open,
400 .release = v4l2_fh_release,
401 .poll = v4l2_ctrl_poll,
402 .unlocked_ioctl = video_ioctl2,
403};
404
405static const struct v4l2_ioctl_ops tea5764_ioctl_ops = {
406 .vidioc_querycap = vidioc_querycap,
407 .vidioc_g_tuner = vidioc_g_tuner,
408 .vidioc_s_tuner = vidioc_s_tuner,
409 .vidioc_g_frequency = vidioc_g_frequency,
410 .vidioc_s_frequency = vidioc_s_frequency,
411 .vidioc_log_status = v4l2_ctrl_log_status,
412 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
413 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
414};
415
416
417static struct video_device tea5764_radio_template = {
418 .name = "TEA5764 FM-Radio",
419 .fops = &tea5764_fops,
420 .ioctl_ops = &tea5764_ioctl_ops,
421 .release = video_device_release_empty,
422};
423
424
425static int tea5764_i2c_probe(struct i2c_client *client,
426 const struct i2c_device_id *id)
427{
428 struct tea5764_device *radio;
429 struct v4l2_device *v4l2_dev;
430 struct v4l2_ctrl_handler *hdl;
431 struct tea5764_regs *r;
432 int ret;
433
434 PDEBUG("probe");
435 radio = kzalloc(sizeof(struct tea5764_device), GFP_KERNEL);
436 if (!radio)
437 return -ENOMEM;
438
439 v4l2_dev = &radio->v4l2_dev;
440 ret = v4l2_device_register(&client->dev, v4l2_dev);
441 if (ret < 0) {
442 v4l2_err(v4l2_dev, "could not register v4l2_device\n");
443 goto errfr;
444 }
445
446 hdl = &radio->ctrl_handler;
447 v4l2_ctrl_handler_init(hdl, 1);
448 v4l2_ctrl_new_std(hdl, &tea5764_ctrl_ops,
449 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
450 v4l2_dev->ctrl_handler = hdl;
451 if (hdl->error) {
452 ret = hdl->error;
453 v4l2_err(v4l2_dev, "Could not register controls\n");
454 goto errunreg;
455 }
456
457 mutex_init(&radio->mutex);
458 radio->i2c_client = client;
459 ret = tea5764_i2c_read(radio);
460 if (ret)
461 goto errunreg;
462 r = &radio->regs;
463 PDEBUG("chipid = %04X, manid = %04X", r->chipid, r->manid);
464 if (r->chipid != TEA5764_CHIPID ||
465 (r->manid & 0x0fff) != TEA5764_MANID) {
466 PWARN("This chip is not a TEA5764!");
467 ret = -EINVAL;
468 goto errunreg;
469 }
470
471 radio->vdev = tea5764_radio_template;
472
473 i2c_set_clientdata(client, radio);
474 video_set_drvdata(&radio->vdev, radio);
475 radio->vdev.lock = &radio->mutex;
476 radio->vdev.v4l2_dev = v4l2_dev;
477
478
479 tea5764_i2c_read(radio);
480 tea5764_set_audout_mode(radio, V4L2_TUNER_MODE_STEREO);
481 tea5764_mute(radio, 1);
482 tea5764_power_down(radio);
483
484 ret = video_register_device(&radio->vdev, VFL_TYPE_RADIO, radio_nr);
485 if (ret < 0) {
486 PWARN("Could not register video device!");
487 goto errunreg;
488 }
489
490 PINFO("registered.");
491 return 0;
492errunreg:
493 v4l2_ctrl_handler_free(hdl);
494 v4l2_device_unregister(v4l2_dev);
495errfr:
496 kfree(radio);
497 return ret;
498}
499
500static int tea5764_i2c_remove(struct i2c_client *client)
501{
502 struct tea5764_device *radio = i2c_get_clientdata(client);
503
504 PDEBUG("remove");
505 if (radio) {
506 tea5764_power_down(radio);
507 video_unregister_device(&radio->vdev);
508 v4l2_ctrl_handler_free(&radio->ctrl_handler);
509 v4l2_device_unregister(&radio->v4l2_dev);
510 kfree(radio);
511 }
512 return 0;
513}
514
515
516static const struct i2c_device_id tea5764_id[] = {
517 { "radio-tea5764", 0 },
518 { }
519};
520MODULE_DEVICE_TABLE(i2c, tea5764_id);
521
522static struct i2c_driver tea5764_i2c_driver = {
523 .driver = {
524 .name = "radio-tea5764",
525 },
526 .probe = tea5764_i2c_probe,
527 .remove = tea5764_i2c_remove,
528 .id_table = tea5764_id,
529};
530
531module_i2c_driver(tea5764_i2c_driver);
532
533MODULE_AUTHOR(DRIVER_AUTHOR);
534MODULE_DESCRIPTION(DRIVER_DESC);
535MODULE_LICENSE("GPL");
536MODULE_VERSION(DRIVER_VERSION);
537
538module_param(use_xtal, int, 0);
539MODULE_PARM_DESC(use_xtal, "Chip have a xtal connected in board");
540module_param(radio_nr, int, 0);
541MODULE_PARM_DESC(radio_nr, "video4linux device number to use");
542
