?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / media / radio / radio-tea5764.c
blobafb763256fd68a9a203f060c104707fe1699a29d
1 /*
2 * driver/media/radio/radio-tea5764.c
3 *
4 * Driver for TEA5764 radio chip for linux 2.6.
5 * This driver is for TEA5764 chip from NXP, used in EZX phones from Motorola.
6 * The I2C protocol is used for communicate with chip.
7 *
8 * Based in radio-tea5761.c Copyright (C) 2005 Nokia Corporation
9 *
10 * Copyright (c) 2008 Fabio Belavenuto <belavenuto@gmail.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * History:
23 * 2008-12-06 Fabio Belavenuto <belavenuto@gmail.com>
24 * initial code
25 *
26 * TODO:
27 * add platform_data support for IRQs platform dependencies
28 * add RDS support
29 */
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/module.h>
33 #include <linux/init.h> /* Initdata */
34 #include <linux/videodev2.h> /* kernel radio structs */
35 #include <linux/i2c.h> /* I2C */
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 /* Frequency limits in MHz -- these are European values. For Japanese
58 devices, that would be 76000 and 91000. */
59 #define FREQ_MIN 87500U
60 #define FREQ_MAX 108000U
61 #define FREQ_MUL 16
62
63 /* TEA5764 registers */
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
104 struct tea5764_regs {
105 u16 intreg; /* INTFLAG & INTMSK */
106 u16 frqset; /* FRQSETMSB & FRQSETLSB */
107 u16 tnctrl; /* TNCTRL1 & TNCTRL2 */
108 u16 frqchk; /* FRQCHKMSB & FRQCHKLSB */
109 u16 tunchk; /* IFCHK & LEVCHK */
110 u16 testreg; /* TESTBITS & TESTMODE */
111 u16 rdsstat; /* RDSSTAT1 & RDSSTAT2 */
112 u16 rdslb; /* RDSLBMSB & RDSLBLSB */
113 u16 rdspb; /* RDSPBMSB & RDSPBLSB */
114 u16 rdsbc; /* RDSBBC & RDSGBC */
115 u16 rdsctrl; /* RDSCTRL1 & RDSCTRL2 */
116 u16 rdsbbl; /* PAUSEDET & RDSBBL */
117 u16 manid; /* MANID1 & MANID2 */
118 u16 chipid; /* CHIPID1 & CHIPID2 */
119 } __attribute__ ((packed));
120
121 struct tea5764_write_regs {
122 u8 intreg; /* INTMSK */
123 __be16 frqset; /* FRQSETMSB & FRQSETLSB */
124 __be16 tnctrl; /* TNCTRL1 & TNCTRL2 */
125 __be16 testreg; /* TESTBITS & TESTMODE */
126 __be16 rdsctrl; /* RDSCTRL1 & RDSCTRL2 */
127 __be16 rdsbbl; /* PAUSEDET & 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
136 static int radio_nr = -1;
137 static int use_xtal = RADIO_TEA5764_XTAL;
138
139 struct 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 /* I2C code related */
149 static 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
169 static 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
191 static 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
208 static 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
218 static void tea5764_set_freq(struct tea5764_device *radio, int freq)
219 {
220 struct tea5764_regs *r = &radio->regs;
221
222 /* formula: (freq [+ or -] 225000) / 8192 */
223 if (r->tnctrl & TEA5764_TNCTRL_HLSI)
224 r->frqset = (freq + 225000) / 8192;
225 else
226 r->frqset = (freq - 225000) / 8192;
227 }
228
229 static 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 /* tune an frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
240 static 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
247 static 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
260 static 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
270 static 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 /* V4L2 vidioc */
284 static 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
299 static 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
325 static 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
337 static 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 /* We special case this as a power down control. */
347 tea5764_power_down(radio);
348 /* Yes, that's what is returned in this case. This
349 whole special case is non-compliant and should really
350 be replaced with something better, but changing this
351 might well break code that depends on this behavior.
352 So we keep it as-is. */
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
361 static 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
379 static 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
392 static const struct v4l2_ctrl_ops tea5764_ctrl_ops = {
393 .s_ctrl = tea5764_s_ctrl,
394 };
395
396 /* File system interface */
397 static 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
405 static 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 /* V4L2 interface */
417 static const 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 /* I2C probe: check if the device exists and register with v4l if it is */
425 static 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 /* initialize and power off the chip */
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;
492 errunreg:
493 v4l2_ctrl_handler_free(hdl);
494 v4l2_device_unregister(v4l2_dev);
495 errfr:
496 kfree(radio);
497 return ret;
498 }
499
500 static 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 /* I2C subsystem interface */
516 static const struct i2c_device_id tea5764_id[] = {
517 { "radio-tea5764", 0 },
518 { } /* Terminating entry */
519 };
520 MODULE_DEVICE_TABLE(i2c, tea5764_id);
521
522 static 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
531 module_i2c_driver(tea5764_i2c_driver);
532
533 MODULE_AUTHOR(DRIVER_AUTHOR);
534 MODULE_DESCRIPTION(DRIVER_DESC);
535 MODULE_LICENSE("GPL");
536 MODULE_VERSION(DRIVER_VERSION);
537
538 module_param(use_xtal, int, 0);
539 MODULE_PARM_DESC(use_xtal, "Chip have a xtal connected in board");
540 module_param(radio_nr, int, 0);
541 MODULE_PARM_DESC(radio_nr, "video4linux device number to use");
CRIS linux kernel tree