xref: /linux/drivers/media/i2c/sony-btf-mpx.c (revision bde5d79d00255db609fe9d859eef8c7b6d38b137)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2005-2006 Micronas USA Inc.
4  */
5 
6 #include <linux/module.h>
7 #include <linux/init.h>
8 #include <linux/i2c.h>
9 #include <linux/videodev2.h>
10 #include <media/tuner.h>
11 #include <media/v4l2-common.h>
12 #include <media/v4l2-ioctl.h>
13 #include <media/v4l2-device.h>
14 #include <linux/slab.h>
15 
16 MODULE_DESCRIPTION("sony-btf-mpx driver");
17 MODULE_LICENSE("GPL v2");
18 
19 static int debug;
20 module_param(debug, int, 0644);
21 MODULE_PARM_DESC(debug, "debug level 0=off(default) 1=on");
22 
23 /* #define MPX_DEBUG */
24 
25 /*
26  * Note:
27  *
28  * AS(IF/MPX) pin:      LOW      HIGH/OPEN
29  * IF/MPX address:   0x42/0x40   0x43/0x44
30  */
31 
32 
33 static int force_mpx_mode = -1;
34 module_param(force_mpx_mode, int, 0644);
35 
36 struct sony_btf_mpx {
37 	struct v4l2_subdev sd;
38 	int mpxmode;
39 	u32 audmode;
40 };
41 
42 static inline struct sony_btf_mpx *to_state(struct v4l2_subdev *sd)
43 {
44 	return container_of(sd, struct sony_btf_mpx, sd);
45 }
46 
47 static int mpx_write(struct i2c_client *client, int dev, int addr, int val)
48 {
49 	u8 buffer[5];
50 	struct i2c_msg msg;
51 
52 	buffer[0] = dev;
53 	buffer[1] = addr >> 8;
54 	buffer[2] = addr & 0xff;
55 	buffer[3] = val >> 8;
56 	buffer[4] = val & 0xff;
57 	msg.addr = client->addr;
58 	msg.flags = 0;
59 	msg.len = 5;
60 	msg.buf = buffer;
61 	i2c_transfer(client->adapter, &msg, 1);
62 	return 0;
63 }
64 
65 /*
66  * MPX register values for the BTF-PG472Z:
67  *
68  *                                 FM_     NICAM_  SCART_
69  *          MODUS  SOURCE    ACB   PRESCAL PRESCAL PRESCAL SYSTEM  VOLUME
70  *         10/0030 12/0008 12/0013 12/000E 12/0010 12/0000 10/0020 12/0000
71  *         ---------------------------------------------------------------
72  * Auto     1003    0020    0100    2603    5000    XXXX    0001    7500
73  *
74  * B/G
75  *  Mono    1003    0020    0100    2603    5000    XXXX    0003    7500
76  *  A2      1003    0020    0100    2601    5000    XXXX    0003    7500
77  *  NICAM   1003    0120    0100    2603    5000    XXXX    0008    7500
78  *
79  * I
80  *  Mono    1003    0020    0100    2603    7900    XXXX    000A    7500
81  *  NICAM   1003    0120    0100    2603    7900    XXXX    000A    7500
82  *
83  * D/K
84  *  Mono    1003    0020    0100    2603    5000    XXXX    0004    7500
85  *  A2-1    1003    0020    0100    2601    5000    XXXX    0004    7500
86  *  A2-2    1003    0020    0100    2601    5000    XXXX    0005    7500
87  *  A2-3    1003    0020    0100    2601    5000    XXXX    0007    7500
88  *  NICAM   1003    0120    0100    2603    5000    XXXX    000B    7500
89  *
90  * L/L'
91  *  Mono    0003    0200    0100    7C03    5000    2200    0009    7500
92  *  NICAM   0003    0120    0100    7C03    5000    XXXX    0009    7500
93  *
94  * M
95  *  Mono    1003    0200    0100    2B03    5000    2B00    0002    7500
96  *
97  * For Asia, replace the 0x26XX in FM_PRESCALE with 0x14XX.
98  *
99  * Bilingual selection in A2/NICAM:
100  *
101  *         High byte of SOURCE     Left chan   Right chan
102  *                 0x01              MAIN         SUB
103  *                 0x03              MAIN         MAIN
104  *                 0x04              SUB          SUB
105  *
106  * Force mono in NICAM by setting the high byte of SOURCE to 0x02 (L/L') or
107  * 0x00 (all other bands).  Force mono in A2 with FMONO_A2:
108  *
109  *                      FMONO_A2
110  *                      10/0022
111  *                      --------
112  *     Forced mono ON     07F0
113  *     Forced mono OFF    0190
114  */
115 
116 static const struct {
117 	enum { AUD_MONO, AUD_A2, AUD_NICAM, AUD_NICAM_L } audio_mode;
118 	u16 modus;
119 	u16 source;
120 	u16 acb;
121 	u16 fm_prescale;
122 	u16 nicam_prescale;
123 	u16 scart_prescale;
124 	u16 system;
125 	u16 volume;
126 } mpx_audio_modes[] = {
127 	/* Auto */	{ AUD_MONO,	0x1003, 0x0020, 0x0100, 0x2603,
128 					0x5000, 0x0000, 0x0001, 0x7500 },
129 	/* B/G Mono */	{ AUD_MONO,	0x1003, 0x0020, 0x0100, 0x2603,
130 					0x5000, 0x0000, 0x0003, 0x7500 },
131 	/* B/G A2 */	{ AUD_A2,	0x1003, 0x0020, 0x0100, 0x2601,
132 					0x5000, 0x0000, 0x0003, 0x7500 },
133 	/* B/G NICAM */ { AUD_NICAM,	0x1003, 0x0120, 0x0100, 0x2603,
134 					0x5000, 0x0000, 0x0008, 0x7500 },
135 	/* I Mono */	{ AUD_MONO,	0x1003, 0x0020, 0x0100, 0x2603,
136 					0x7900, 0x0000, 0x000A, 0x7500 },
137 	/* I NICAM */	{ AUD_NICAM,	0x1003, 0x0120, 0x0100, 0x2603,
138 					0x7900, 0x0000, 0x000A, 0x7500 },
139 	/* D/K Mono */	{ AUD_MONO,	0x1003, 0x0020, 0x0100, 0x2603,
140 					0x5000, 0x0000, 0x0004, 0x7500 },
141 	/* D/K A2-1 */	{ AUD_A2,	0x1003, 0x0020, 0x0100, 0x2601,
142 					0x5000, 0x0000, 0x0004, 0x7500 },
143 	/* D/K A2-2 */	{ AUD_A2,	0x1003, 0x0020, 0x0100, 0x2601,
144 					0x5000, 0x0000, 0x0005, 0x7500 },
145 	/* D/K A2-3 */	{ AUD_A2,	0x1003, 0x0020, 0x0100, 0x2601,
146 					0x5000, 0x0000, 0x0007, 0x7500 },
147 	/* D/K NICAM */	{ AUD_NICAM,	0x1003, 0x0120, 0x0100, 0x2603,
148 					0x5000, 0x0000, 0x000B, 0x7500 },
149 	/* L/L' Mono */	{ AUD_MONO,	0x0003, 0x0200, 0x0100, 0x7C03,
150 					0x5000, 0x2200, 0x0009, 0x7500 },
151 	/* L/L' NICAM */{ AUD_NICAM_L,	0x0003, 0x0120, 0x0100, 0x7C03,
152 					0x5000, 0x0000, 0x0009, 0x7500 },
153 };
154 
155 #define MPX_NUM_MODES	ARRAY_SIZE(mpx_audio_modes)
156 
157 static int mpx_setup(struct sony_btf_mpx *t)
158 {
159 	struct i2c_client *client = v4l2_get_subdevdata(&t->sd);
160 	u16 source = 0;
161 	u8 buffer[3];
162 	struct i2c_msg msg;
163 	int mode = t->mpxmode;
164 
165 	/* reset MPX */
166 	buffer[0] = 0x00;
167 	buffer[1] = 0x80;
168 	buffer[2] = 0x00;
169 	msg.addr = client->addr;
170 	msg.flags = 0;
171 	msg.len = 3;
172 	msg.buf = buffer;
173 	i2c_transfer(client->adapter, &msg, 1);
174 	buffer[1] = 0x00;
175 	i2c_transfer(client->adapter, &msg, 1);
176 
177 	if (t->audmode != V4L2_TUNER_MODE_MONO)
178 		mode++;
179 
180 	if (mpx_audio_modes[mode].audio_mode != AUD_MONO) {
181 		switch (t->audmode) {
182 		case V4L2_TUNER_MODE_MONO:
183 			switch (mpx_audio_modes[mode].audio_mode) {
184 			case AUD_A2:
185 				source = mpx_audio_modes[mode].source;
186 				break;
187 			case AUD_NICAM:
188 				source = 0x0000;
189 				break;
190 			case AUD_NICAM_L:
191 				source = 0x0200;
192 				break;
193 			default:
194 				break;
195 			}
196 			break;
197 		case V4L2_TUNER_MODE_STEREO:
198 			source = mpx_audio_modes[mode].source;
199 			break;
200 		case V4L2_TUNER_MODE_LANG1:
201 			source = 0x0300;
202 			break;
203 		case V4L2_TUNER_MODE_LANG2:
204 			source = 0x0400;
205 			break;
206 		}
207 		source |= mpx_audio_modes[mode].source & 0x00ff;
208 	} else
209 		source = mpx_audio_modes[mode].source;
210 
211 	mpx_write(client, 0x10, 0x0030, mpx_audio_modes[mode].modus);
212 	mpx_write(client, 0x12, 0x0008, source);
213 	mpx_write(client, 0x12, 0x0013, mpx_audio_modes[mode].acb);
214 	mpx_write(client, 0x12, 0x000e,
215 			mpx_audio_modes[mode].fm_prescale);
216 	mpx_write(client, 0x12, 0x0010,
217 			mpx_audio_modes[mode].nicam_prescale);
218 	mpx_write(client, 0x12, 0x000d,
219 			mpx_audio_modes[mode].scart_prescale);
220 	mpx_write(client, 0x10, 0x0020, mpx_audio_modes[mode].system);
221 	mpx_write(client, 0x12, 0x0000, mpx_audio_modes[mode].volume);
222 	if (mpx_audio_modes[mode].audio_mode == AUD_A2)
223 		mpx_write(client, 0x10, 0x0022,
224 			t->audmode == V4L2_TUNER_MODE_MONO ? 0x07f0 : 0x0190);
225 
226 #ifdef MPX_DEBUG
227 	{
228 		u8 buf1[3], buf2[2];
229 		struct i2c_msg msgs[2];
230 
231 		v4l2_info(client,
232 			"MPX registers: %04x %04x %04x %04x %04x %04x %04x %04x\n",
233 			mpx_audio_modes[mode].modus,
234 			source,
235 			mpx_audio_modes[mode].acb,
236 			mpx_audio_modes[mode].fm_prescale,
237 			mpx_audio_modes[mode].nicam_prescale,
238 			mpx_audio_modes[mode].scart_prescale,
239 			mpx_audio_modes[mode].system,
240 			mpx_audio_modes[mode].volume);
241 		buf1[0] = 0x11;
242 		buf1[1] = 0x00;
243 		buf1[2] = 0x7e;
244 		msgs[0].addr = client->addr;
245 		msgs[0].flags = 0;
246 		msgs[0].len = 3;
247 		msgs[0].buf = buf1;
248 		msgs[1].addr = client->addr;
249 		msgs[1].flags = I2C_M_RD;
250 		msgs[1].len = 2;
251 		msgs[1].buf = buf2;
252 		i2c_transfer(client->adapter, msgs, 2);
253 		v4l2_info(client, "MPX system: %02x%02x\n",
254 				buf2[0], buf2[1]);
255 		buf1[0] = 0x11;
256 		buf1[1] = 0x02;
257 		buf1[2] = 0x00;
258 		i2c_transfer(client->adapter, msgs, 2);
259 		v4l2_info(client, "MPX status: %02x%02x\n",
260 				buf2[0], buf2[1]);
261 	}
262 #endif
263 	return 0;
264 }
265 
266 
267 static int sony_btf_mpx_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
268 {
269 	struct sony_btf_mpx *t = to_state(sd);
270 	int default_mpx_mode = 0;
271 
272 	if (std & V4L2_STD_PAL_BG)
273 		default_mpx_mode = 1;
274 	else if (std & V4L2_STD_PAL_I)
275 		default_mpx_mode = 4;
276 	else if (std & V4L2_STD_PAL_DK)
277 		default_mpx_mode = 6;
278 	else if (std & V4L2_STD_SECAM_L)
279 		default_mpx_mode = 11;
280 
281 	if (default_mpx_mode != t->mpxmode) {
282 		t->mpxmode = default_mpx_mode;
283 		mpx_setup(t);
284 	}
285 	return 0;
286 }
287 
288 static int sony_btf_mpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
289 {
290 	struct sony_btf_mpx *t = to_state(sd);
291 
292 	vt->capability = V4L2_TUNER_CAP_NORM |
293 		V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LANG1 |
294 		V4L2_TUNER_CAP_LANG2;
295 	vt->rxsubchans = V4L2_TUNER_SUB_MONO |
296 		V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_LANG1 |
297 		V4L2_TUNER_SUB_LANG2;
298 	vt->audmode = t->audmode;
299 	return 0;
300 }
301 
302 static int sony_btf_mpx_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
303 {
304 	struct sony_btf_mpx *t = to_state(sd);
305 
306 	if (vt->type != V4L2_TUNER_ANALOG_TV)
307 		return -EINVAL;
308 
309 	if (vt->audmode != t->audmode) {
310 		t->audmode = vt->audmode;
311 		mpx_setup(t);
312 	}
313 	return 0;
314 }
315 
316 /* --------------------------------------------------------------------------*/
317 
318 static const struct v4l2_subdev_tuner_ops sony_btf_mpx_tuner_ops = {
319 	.s_tuner = sony_btf_mpx_s_tuner,
320 	.g_tuner = sony_btf_mpx_g_tuner,
321 };
322 
323 static const struct v4l2_subdev_video_ops sony_btf_mpx_video_ops = {
324 	.s_std = sony_btf_mpx_s_std,
325 };
326 
327 static const struct v4l2_subdev_ops sony_btf_mpx_ops = {
328 	.tuner = &sony_btf_mpx_tuner_ops,
329 	.video = &sony_btf_mpx_video_ops,
330 };
331 
332 /* --------------------------------------------------------------------------*/
333 
334 static int sony_btf_mpx_probe(struct i2c_client *client)
335 {
336 	struct sony_btf_mpx *t;
337 	struct v4l2_subdev *sd;
338 
339 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
340 		return -ENODEV;
341 
342 	v4l_info(client, "chip found @ 0x%x (%s)\n",
343 			client->addr << 1, client->adapter->name);
344 
345 	t = devm_kzalloc(&client->dev, sizeof(*t), GFP_KERNEL);
346 	if (t == NULL)
347 		return -ENOMEM;
348 
349 	sd = &t->sd;
350 	v4l2_i2c_subdev_init(sd, client, &sony_btf_mpx_ops);
351 
352 	/* Initialize sony_btf_mpx */
353 	t->mpxmode = 0;
354 	t->audmode = V4L2_TUNER_MODE_STEREO;
355 
356 	return 0;
357 }
358 
359 static void sony_btf_mpx_remove(struct i2c_client *client)
360 {
361 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
362 
363 	v4l2_device_unregister_subdev(sd);
364 }
365 
366 /* ----------------------------------------------------------------------- */
367 
368 static const struct i2c_device_id sony_btf_mpx_id[] = {
369 	{ "sony-btf-mpx" },
370 	{ }
371 };
372 MODULE_DEVICE_TABLE(i2c, sony_btf_mpx_id);
373 
374 static struct i2c_driver sony_btf_mpx_driver = {
375 	.driver = {
376 		.name	= "sony-btf-mpx",
377 	},
378 	.probe = sony_btf_mpx_probe,
379 	.remove = sony_btf_mpx_remove,
380 	.id_table = sony_btf_mpx_id,
381 };
382 module_i2c_driver(sony_btf_mpx_driver);
383