1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * driver/media/radio/radio-tea5764.c
4  *
5  * Driver for TEA5764 radio chip for linux 2.6.
6  * This driver is for TEA5764 chip from NXP, used in EZX phones from Motorola.
7  * The I2C protocol is used for communicate with chip.
8  *
9  * Based in radio-tea5761.c Copyright (C) 2005 Nokia Corporation
10  *
11  *  Copyright (c) 2008 Fabio Belavenuto <belavenuto@gmail.com>
12  *
13  * History:
14  * 2008-12-06   Fabio Belavenuto <belavenuto@gmail.com>
15  *              initial code
16  *
17  * TODO:
18  *  add platform_data support for IRQs platform dependencies
19  *  add RDS support
20  */
21 #include <linux/kernel.h>
22 #include <linux/slab.h>
23 #include <linux/module.h>
24 #include <linux/init.h>			/* Initdata			*/
25 #include <linux/videodev2.h>		/* kernel radio structs		*/
26 #include <linux/i2c.h>			/* I2C				*/
27 #include <media/v4l2-common.h>
28 #include <media/v4l2-ioctl.h>
29 #include <media/v4l2-device.h>
30 #include <media/v4l2-ctrls.h>
31 #include <media/v4l2-event.h>
32 
33 #define DRIVER_VERSION	"0.0.2"
34 
35 #define DRIVER_AUTHOR	"Fabio Belavenuto <belavenuto@gmail.com>"
36 #define DRIVER_DESC	"A driver for the TEA5764 radio chip for EZX Phones."
37 
38 #define PINFO(format, ...)\
39 	printk(KERN_INFO KBUILD_MODNAME ": "\
40 		DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
41 #define PWARN(format, ...)\
42 	printk(KERN_WARNING KBUILD_MODNAME ": "\
43 		DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
44 # define PDEBUG(format, ...)\
45 	printk(KERN_DEBUG KBUILD_MODNAME ": "\
46 		DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
47 
48 /* Frequency limits in MHz -- these are European values.  For Japanese
49 devices, that would be 76000 and 91000.  */
50 #define FREQ_MIN  87500U
51 #define FREQ_MAX 108000U
52 #define FREQ_MUL 16
53 
54 /* TEA5764 registers */
55 #define TEA5764_MANID		0x002b
56 #define TEA5764_CHIPID		0x5764
57 
58 #define TEA5764_INTREG_BLMSK	0x0001
59 #define TEA5764_INTREG_FRRMSK	0x0002
60 #define TEA5764_INTREG_LEVMSK	0x0008
61 #define TEA5764_INTREG_IFMSK	0x0010
62 #define TEA5764_INTREG_BLMFLAG	0x0100
63 #define TEA5764_INTREG_FRRFLAG	0x0200
64 #define TEA5764_INTREG_LEVFLAG	0x0800
65 #define TEA5764_INTREG_IFFLAG	0x1000
66 
67 #define TEA5764_FRQSET_SUD	0x8000
68 #define TEA5764_FRQSET_SM	0x4000
69 
70 #define TEA5764_TNCTRL_PUPD1	0x8000
71 #define TEA5764_TNCTRL_PUPD0	0x4000
72 #define TEA5764_TNCTRL_BLIM	0x2000
73 #define TEA5764_TNCTRL_SWPM	0x1000
74 #define TEA5764_TNCTRL_IFCTC	0x0800
75 #define TEA5764_TNCTRL_AFM	0x0400
76 #define TEA5764_TNCTRL_SMUTE	0x0200
77 #define TEA5764_TNCTRL_SNC	0x0100
78 #define TEA5764_TNCTRL_MU	0x0080
79 #define TEA5764_TNCTRL_SSL1	0x0040
80 #define TEA5764_TNCTRL_SSL0	0x0020
81 #define TEA5764_TNCTRL_HLSI	0x0010
82 #define TEA5764_TNCTRL_MST	0x0008
83 #define TEA5764_TNCTRL_SWP	0x0004
84 #define TEA5764_TNCTRL_DTC	0x0002
85 #define TEA5764_TNCTRL_AHLSI	0x0001
86 
87 #define TEA5764_TUNCHK_LEVEL(x)	(((x) & 0x00F0) >> 4)
88 #define TEA5764_TUNCHK_IFCNT(x) (((x) & 0xFE00) >> 9)
89 #define TEA5764_TUNCHK_TUNTO	0x0100
90 #define TEA5764_TUNCHK_LD	0x0008
91 #define TEA5764_TUNCHK_STEREO	0x0004
92 
93 #define TEA5764_TESTREG_TRIGFR	0x0800
94 
95 struct tea5764_regs {
96 	u16 intreg;				/* INTFLAG & INTMSK */
97 	u16 frqset;				/* FRQSETMSB & FRQSETLSB */
98 	u16 tnctrl;				/* TNCTRL1 & TNCTRL2 */
99 	u16 frqchk;				/* FRQCHKMSB & FRQCHKLSB */
100 	u16 tunchk;				/* IFCHK & LEVCHK */
101 	u16 testreg;				/* TESTBITS & TESTMODE */
102 	u16 rdsstat;				/* RDSSTAT1 & RDSSTAT2 */
103 	u16 rdslb;				/* RDSLBMSB & RDSLBLSB */
104 	u16 rdspb;				/* RDSPBMSB & RDSPBLSB */
105 	u16 rdsbc;				/* RDSBBC & RDSGBC */
106 	u16 rdsctrl;				/* RDSCTRL1 & RDSCTRL2 */
107 	u16 rdsbbl;				/* PAUSEDET & RDSBBL */
108 	u16 manid;				/* MANID1 & MANID2 */
109 	u16 chipid;				/* CHIPID1 & CHIPID2 */
110 } __attribute__ ((packed));
111 
112 struct tea5764_write_regs {
113 	u8 intreg;				/* INTMSK */
114 	__be16 frqset;				/* FRQSETMSB & FRQSETLSB */
115 	__be16 tnctrl;				/* TNCTRL1 & TNCTRL2 */
116 	__be16 testreg;				/* TESTBITS & TESTMODE */
117 	__be16 rdsctrl;				/* RDSCTRL1 & RDSCTRL2 */
118 	__be16 rdsbbl;				/* PAUSEDET & RDSBBL */
119 } __attribute__ ((packed));
120 
121 #ifdef CONFIG_RADIO_TEA5764_XTAL
122 #define RADIO_TEA5764_XTAL 1
123 #else
124 #define RADIO_TEA5764_XTAL 0
125 #endif
126 
127 static int radio_nr = -1;
128 static int use_xtal = RADIO_TEA5764_XTAL;
129 
130 struct tea5764_device {
131 	struct v4l2_device		v4l2_dev;
132 	struct v4l2_ctrl_handler	ctrl_handler;
133 	struct i2c_client		*i2c_client;
134 	struct video_device		vdev;
135 	struct tea5764_regs		regs;
136 	struct mutex			mutex;
137 };
138 
139 /* I2C code related */
140 static int tea5764_i2c_read(struct tea5764_device *radio)
141 {
142 	int i;
143 	u16 *p = (u16 *) &radio->regs;
144 
145 	struct i2c_msg msgs[1] = {
146 		{	.addr = radio->i2c_client->addr,
147 			.flags = I2C_M_RD,
148 			.len = sizeof(radio->regs),
149 			.buf = (void *)&radio->regs
150 		},
151 	};
152 	if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
153 		return -EIO;
154 	for (i = 0; i < sizeof(struct tea5764_regs) / sizeof(u16); i++)
155 		p[i] = __be16_to_cpu((__force __be16)p[i]);
156 
157 	return 0;
158 }
159 
160 static int tea5764_i2c_write(struct tea5764_device *radio)
161 {
162 	struct tea5764_write_regs wr;
163 	struct tea5764_regs *r = &radio->regs;
164 	struct i2c_msg msgs[1] = {
165 		{
166 			.addr = radio->i2c_client->addr,
167 			.len = sizeof(wr),
168 			.buf = (void *)&wr
169 		},
170 	};
171 	wr.intreg  = r->intreg & 0xff;
172 	wr.frqset  = __cpu_to_be16(r->frqset);
173 	wr.tnctrl  = __cpu_to_be16(r->tnctrl);
174 	wr.testreg = __cpu_to_be16(r->testreg);
175 	wr.rdsctrl = __cpu_to_be16(r->rdsctrl);
176 	wr.rdsbbl  = __cpu_to_be16(r->rdsbbl);
177 	if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
178 		return -EIO;
179 	return 0;
180 }
181 
182 static void tea5764_power_up(struct tea5764_device *radio)
183 {
184 	struct tea5764_regs *r = &radio->regs;
185 
186 	if (!(r->tnctrl & TEA5764_TNCTRL_PUPD0)) {
187 		r->tnctrl &= ~(TEA5764_TNCTRL_AFM | TEA5764_TNCTRL_MU |
188 			       TEA5764_TNCTRL_HLSI);
189 		if (!use_xtal)
190 			r->testreg |= TEA5764_TESTREG_TRIGFR;
191 		else
192 			r->testreg &= ~TEA5764_TESTREG_TRIGFR;
193 
194 		r->tnctrl |= TEA5764_TNCTRL_PUPD0;
195 		tea5764_i2c_write(radio);
196 	}
197 }
198 
199 static void tea5764_power_down(struct tea5764_device *radio)
200 {
201 	struct tea5764_regs *r = &radio->regs;
202 
203 	if (r->tnctrl & TEA5764_TNCTRL_PUPD0) {
204 		r->tnctrl &= ~TEA5764_TNCTRL_PUPD0;
205 		tea5764_i2c_write(radio);
206 	}
207 }
208 
209 static void tea5764_set_freq(struct tea5764_device *radio, int freq)
210 {
211 	struct tea5764_regs *r = &radio->regs;
212 
213 	/* formula: (freq [+ or -] 225000) / 8192 */
214 	if (r->tnctrl & TEA5764_TNCTRL_HLSI)
215 		r->frqset = (freq + 225000) / 8192;
216 	else
217 		r->frqset = (freq - 225000) / 8192;
218 }
219 
220 static int tea5764_get_freq(struct tea5764_device *radio)
221 {
222 	struct tea5764_regs *r = &radio->regs;
223 
224 	if (r->tnctrl & TEA5764_TNCTRL_HLSI)
225 		return (r->frqchk * 8192) - 225000;
226 	else
227 		return (r->frqchk * 8192) + 225000;
228 }
229 
230 /* tune an frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
231 static void tea5764_tune(struct tea5764_device *radio, int freq)
232 {
233 	tea5764_set_freq(radio, freq);
234 	if (tea5764_i2c_write(radio))
235 		PWARN("Could not set frequency!");
236 }
237 
238 static void tea5764_set_audout_mode(struct tea5764_device *radio, int audmode)
239 {
240 	struct tea5764_regs *r = &radio->regs;
241 	int tnctrl = r->tnctrl;
242 
243 	if (audmode == V4L2_TUNER_MODE_MONO)
244 		r->tnctrl |= TEA5764_TNCTRL_MST;
245 	else
246 		r->tnctrl &= ~TEA5764_TNCTRL_MST;
247 	if (tnctrl != r->tnctrl)
248 		tea5764_i2c_write(radio);
249 }
250 
251 static int tea5764_get_audout_mode(struct tea5764_device *radio)
252 {
253 	struct tea5764_regs *r = &radio->regs;
254 
255 	if (r->tnctrl & TEA5764_TNCTRL_MST)
256 		return V4L2_TUNER_MODE_MONO;
257 	else
258 		return V4L2_TUNER_MODE_STEREO;
259 }
260 
261 static void tea5764_mute(struct tea5764_device *radio, int on)
262 {
263 	struct tea5764_regs *r = &radio->regs;
264 	int tnctrl = r->tnctrl;
265 
266 	if (on)
267 		r->tnctrl |= TEA5764_TNCTRL_MU;
268 	else
269 		r->tnctrl &= ~TEA5764_TNCTRL_MU;
270 	if (tnctrl != r->tnctrl)
271 		tea5764_i2c_write(radio);
272 }
273 
274 /* V4L2 vidioc */
275 static int vidioc_querycap(struct file *file, void  *priv,
276 					struct v4l2_capability *v)
277 {
278 	struct tea5764_device *radio = video_drvdata(file);
279 	struct video_device *dev = &radio->vdev;
280 
281 	strscpy(v->driver, dev->dev.driver->name, sizeof(v->driver));
282 	strscpy(v->card, dev->name, sizeof(v->card));
283 	snprintf(v->bus_info, sizeof(v->bus_info),
284 		 "I2C:%s", dev_name(&dev->dev));
285 	return 0;
286 }
287 
288 static int vidioc_g_tuner(struct file *file, void *priv,
289 				struct v4l2_tuner *v)
290 {
291 	struct tea5764_device *radio = video_drvdata(file);
292 	struct tea5764_regs *r = &radio->regs;
293 
294 	if (v->index > 0)
295 		return -EINVAL;
296 
297 	strscpy(v->name, "FM", sizeof(v->name));
298 	v->type = V4L2_TUNER_RADIO;
299 	tea5764_i2c_read(radio);
300 	v->rangelow   = FREQ_MIN * FREQ_MUL;
301 	v->rangehigh  = FREQ_MAX * FREQ_MUL;
302 	v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
303 	if (r->tunchk & TEA5764_TUNCHK_STEREO)
304 		v->rxsubchans = V4L2_TUNER_SUB_STEREO;
305 	else
306 		v->rxsubchans = V4L2_TUNER_SUB_MONO;
307 	v->audmode = tea5764_get_audout_mode(radio);
308 	v->signal = TEA5764_TUNCHK_LEVEL(r->tunchk) * 0xffff / 0xf;
309 	v->afc = TEA5764_TUNCHK_IFCNT(r->tunchk);
310 
311 	return 0;
312 }
313 
314 static int vidioc_s_tuner(struct file *file, void *priv,
315 				const struct v4l2_tuner *v)
316 {
317 	struct tea5764_device *radio = video_drvdata(file);
318 
319 	if (v->index > 0)
320 		return -EINVAL;
321 
322 	tea5764_set_audout_mode(radio, v->audmode);
323 	return 0;
324 }
325 
326 static int vidioc_s_frequency(struct file *file, void *priv,
327 				const struct v4l2_frequency *f)
328 {
329 	struct tea5764_device *radio = video_drvdata(file);
330 	unsigned freq = f->frequency;
331 
332 	if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
333 		return -EINVAL;
334 	if (freq == 0) {
335 		/* We special case this as a power down control. */
336 		tea5764_power_down(radio);
337 		/* Yes, that's what is returned in this case. This
338 		   whole special case is non-compliant and should really
339 		   be replaced with something better, but changing this
340 		   might well break code that depends on this behavior.
341 		   So we keep it as-is. */
342 		return -EINVAL;
343 	}
344 	freq = clamp(freq, FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL);
345 	tea5764_power_up(radio);
346 	tea5764_tune(radio, (freq * 125) / 2);
347 	return 0;
348 }
349 
350 static int vidioc_g_frequency(struct file *file, void *priv,
351 				struct v4l2_frequency *f)
352 {
353 	struct tea5764_device *radio = video_drvdata(file);
354 	struct tea5764_regs *r = &radio->regs;
355 
356 	if (f->tuner != 0)
357 		return -EINVAL;
358 	tea5764_i2c_read(radio);
359 	f->type = V4L2_TUNER_RADIO;
360 	if (r->tnctrl & TEA5764_TNCTRL_PUPD0)
361 		f->frequency = (tea5764_get_freq(radio) * 2) / 125;
362 	else
363 		f->frequency = 0;
364 
365 	return 0;
366 }
367 
368 static int tea5764_s_ctrl(struct v4l2_ctrl *ctrl)
369 {
370 	struct tea5764_device *radio =
371 		container_of(ctrl->handler, struct tea5764_device, ctrl_handler);
372 
373 	switch (ctrl->id) {
374 	case V4L2_CID_AUDIO_MUTE:
375 		tea5764_mute(radio, ctrl->val);
376 		return 0;
377 	}
378 	return -EINVAL;
379 }
380 
381 static const struct v4l2_ctrl_ops tea5764_ctrl_ops = {
382 	.s_ctrl = tea5764_s_ctrl,
383 };
384 
385 /* File system interface */
386 static const struct v4l2_file_operations tea5764_fops = {
387 	.owner		= THIS_MODULE,
388 	.open		= v4l2_fh_open,
389 	.release	= v4l2_fh_release,
390 	.poll		= v4l2_ctrl_poll,
391 	.unlocked_ioctl	= video_ioctl2,
392 };
393 
394 static const struct v4l2_ioctl_ops tea5764_ioctl_ops = {
395 	.vidioc_querycap    = vidioc_querycap,
396 	.vidioc_g_tuner     = vidioc_g_tuner,
397 	.vidioc_s_tuner     = vidioc_s_tuner,
398 	.vidioc_g_frequency = vidioc_g_frequency,
399 	.vidioc_s_frequency = vidioc_s_frequency,
400 	.vidioc_log_status  = v4l2_ctrl_log_status,
401 	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
402 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
403 };
404 
405 /* V4L2 interface */
406 static const struct video_device tea5764_radio_template = {
407 	.name		= "TEA5764 FM-Radio",
408 	.fops           = &tea5764_fops,
409 	.ioctl_ops	= &tea5764_ioctl_ops,
410 	.release	= video_device_release_empty,
411 };
412 
413 /* I2C probe: check if the device exists and register with v4l if it is */
414 static int tea5764_i2c_probe(struct i2c_client *client)
415 {
416 	struct tea5764_device *radio;
417 	struct v4l2_device *v4l2_dev;
418 	struct v4l2_ctrl_handler *hdl;
419 	struct tea5764_regs *r;
420 	int ret;
421 
422 	PDEBUG("probe");
423 	radio = kzalloc(sizeof(struct tea5764_device), GFP_KERNEL);
424 	if (!radio)
425 		return -ENOMEM;
426 
427 	v4l2_dev = &radio->v4l2_dev;
428 	ret = v4l2_device_register(&client->dev, v4l2_dev);
429 	if (ret < 0) {
430 		v4l2_err(v4l2_dev, "could not register v4l2_device\n");
431 		goto errfr;
432 	}
433 
434 	hdl = &radio->ctrl_handler;
435 	v4l2_ctrl_handler_init(hdl, 1);
436 	v4l2_ctrl_new_std(hdl, &tea5764_ctrl_ops,
437 			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
438 	v4l2_dev->ctrl_handler = hdl;
439 	if (hdl->error) {
440 		ret = hdl->error;
441 		v4l2_err(v4l2_dev, "Could not register controls\n");
442 		goto errunreg;
443 	}
444 
445 	mutex_init(&radio->mutex);
446 	radio->i2c_client = client;
447 	ret = tea5764_i2c_read(radio);
448 	if (ret)
449 		goto errunreg;
450 	r = &radio->regs;
451 	PDEBUG("chipid = %04X, manid = %04X", r->chipid, r->manid);
452 	if (r->chipid != TEA5764_CHIPID ||
453 		(r->manid & 0x0fff) != TEA5764_MANID) {
454 		PWARN("This chip is not a TEA5764!");
455 		ret = -EINVAL;
456 		goto errunreg;
457 	}
458 
459 	radio->vdev = tea5764_radio_template;
460 
461 	i2c_set_clientdata(client, radio);
462 	video_set_drvdata(&radio->vdev, radio);
463 	radio->vdev.lock = &radio->mutex;
464 	radio->vdev.v4l2_dev = v4l2_dev;
465 	radio->vdev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
466 
467 	/* initialize and power off the chip */
468 	tea5764_i2c_read(radio);
469 	tea5764_set_audout_mode(radio, V4L2_TUNER_MODE_STEREO);
470 	tea5764_mute(radio, 1);
471 	tea5764_power_down(radio);
472 
473 	ret = video_register_device(&radio->vdev, VFL_TYPE_RADIO, radio_nr);
474 	if (ret < 0) {
475 		PWARN("Could not register video device!");
476 		goto errunreg;
477 	}
478 
479 	PINFO("registered.");
480 	return 0;
481 errunreg:
482 	v4l2_ctrl_handler_free(hdl);
483 	v4l2_device_unregister(v4l2_dev);
484 errfr:
485 	kfree(radio);
486 	return ret;
487 }
488 
489 static void tea5764_i2c_remove(struct i2c_client *client)
490 {
491 	struct tea5764_device *radio = i2c_get_clientdata(client);
492 
493 	PDEBUG("remove");
494 	if (radio) {
495 		tea5764_power_down(radio);
496 		video_unregister_device(&radio->vdev);
497 		v4l2_ctrl_handler_free(&radio->ctrl_handler);
498 		v4l2_device_unregister(&radio->v4l2_dev);
499 		kfree(radio);
500 	}
501 }
502 
503 /* I2C subsystem interface */
504 static const struct i2c_device_id tea5764_id[] = {
505 	{ "radio-tea5764", 0 },
506 	{ }					/* Terminating entry */
507 };
508 MODULE_DEVICE_TABLE(i2c, tea5764_id);
509 
510 static struct i2c_driver tea5764_i2c_driver = {
511 	.driver = {
512 		.name = "radio-tea5764",
513 	},
514 	.probe = tea5764_i2c_probe,
515 	.remove = tea5764_i2c_remove,
516 	.id_table = tea5764_id,
517 };
518 
519 module_i2c_driver(tea5764_i2c_driver);
520 
521 MODULE_AUTHOR(DRIVER_AUTHOR);
522 MODULE_DESCRIPTION(DRIVER_DESC);
523 MODULE_LICENSE("GPL");
524 MODULE_VERSION(DRIVER_VERSION);
525 
526 module_param(use_xtal, int, 0);
527 MODULE_PARM_DESC(use_xtal, "Chip have a xtal connected in board");
528 module_param(radio_nr, int, 0);
529 MODULE_PARM_DESC(radio_nr, "video4linux device number to use");
530