1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  adv7175 - adv7175a video encoder driver version 0.0.3
4 *
5 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
6 * Copyright (C) 1999 Wolfgang Scherr <scherr@net4you.net>
7 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
8 *    - some corrections for Pinnacle Systems Inc. DC10plus card.
9 *
10 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
11 *    - moved over to linux>=2.4.x i2c protocol (9/9/2002)
12 */
13
14#include <linux/module.h>
15#include <linux/types.h>
16#include <linux/slab.h>
17#include <linux/ioctl.h>
18#include <linux/uaccess.h>
19#include <linux/i2c.h>
20#include <linux/videodev2.h>
21#include <media/v4l2-device.h>
22
23MODULE_DESCRIPTION("Analog Devices ADV7175 video encoder driver");
24MODULE_AUTHOR("Dave Perks");
25MODULE_LICENSE("GPL");
26
27#define   I2C_ADV7175        0xd4
28#define   I2C_ADV7176        0x54
29
30
31static int debug;
32module_param(debug, int, 0);
33MODULE_PARM_DESC(debug, "Debug level (0-1)");
34
35/* ----------------------------------------------------------------------- */
36
37struct adv7175 {
38	struct v4l2_subdev sd;
39	v4l2_std_id norm;
40	int input;
41};
42
43static inline struct adv7175 *to_adv7175(struct v4l2_subdev *sd)
44{
45	return container_of(sd, struct adv7175, sd);
46}
47
48static char *inputs[] = { "pass_through", "play_back", "color_bar" };
49
50static u32 adv7175_codes[] = {
51	MEDIA_BUS_FMT_UYVY8_2X8,
52	MEDIA_BUS_FMT_UYVY8_1X16,
53};
54
55/* ----------------------------------------------------------------------- */
56
57static inline int adv7175_write(struct v4l2_subdev *sd, u8 reg, u8 value)
58{
59	struct i2c_client *client = v4l2_get_subdevdata(sd);
60
61	return i2c_smbus_write_byte_data(client, reg, value);
62}
63
64static inline int adv7175_read(struct v4l2_subdev *sd, u8 reg)
65{
66	struct i2c_client *client = v4l2_get_subdevdata(sd);
67
68	return i2c_smbus_read_byte_data(client, reg);
69}
70
71static int adv7175_write_block(struct v4l2_subdev *sd,
72		     const u8 *data, unsigned int len)
73{
74	struct i2c_client *client = v4l2_get_subdevdata(sd);
75	int ret = -1;
76	u8 reg;
77
78	/* the adv7175 has an autoincrement function, use it if
79	 * the adapter understands raw I2C */
80	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
81		/* do raw I2C, not smbus compatible */
82		u8 block_data[32];
83		int block_len;
84
85		while (len >= 2) {
86			block_len = 0;
87			block_data[block_len++] = reg = data[0];
88			do {
89				block_data[block_len++] = data[1];
90				reg++;
91				len -= 2;
92				data += 2;
93			} while (len >= 2 && data[0] == reg && block_len < 32);
94			ret = i2c_master_send(client, block_data, block_len);
95			if (ret < 0)
96				break;
97		}
98	} else {
99		/* do some slow I2C emulation kind of thing */
100		while (len >= 2) {
101			reg = *data++;
102			ret = adv7175_write(sd, reg, *data++);
103			if (ret < 0)
104				break;
105			len -= 2;
106		}
107	}
108
109	return ret;
110}
111
112static void set_subcarrier_freq(struct v4l2_subdev *sd, int pass_through)
113{
114	/* for some reason pass_through NTSC needs
115	 * a different sub-carrier freq to remain stable. */
116	if (pass_through)
117		adv7175_write(sd, 0x02, 0x00);
118	else
119		adv7175_write(sd, 0x02, 0x55);
120
121	adv7175_write(sd, 0x03, 0x55);
122	adv7175_write(sd, 0x04, 0x55);
123	adv7175_write(sd, 0x05, 0x25);
124}
125
126/* ----------------------------------------------------------------------- */
127/* Output filter:  S-Video  Composite */
128
129#define MR050       0x11	/* 0x09 */
130#define MR060       0x14	/* 0x0c */
131
132/* ----------------------------------------------------------------------- */
133
134#define TR0MODE     0x46
135#define TR0RST	    0x80
136
137#define TR1CAPT	    0x80
138#define TR1PLAY	    0x00
139
140static const unsigned char init_common[] = {
141
142	0x00, MR050,		/* MR0, PAL enabled */
143	0x01, 0x00,		/* MR1 */
144	0x02, 0x0c,		/* subc. freq. */
145	0x03, 0x8c,		/* subc. freq. */
146	0x04, 0x79,		/* subc. freq. */
147	0x05, 0x26,		/* subc. freq. */
148	0x06, 0x40,		/* subc. phase */
149
150	0x07, TR0MODE,		/* TR0, 16bit */
151	0x08, 0x21,		/*  */
152	0x09, 0x00,		/*  */
153	0x0a, 0x00,		/*  */
154	0x0b, 0x00,		/*  */
155	0x0c, TR1CAPT,		/* TR1 */
156	0x0d, 0x4f,		/* MR2 */
157	0x0e, 0x00,		/*  */
158	0x0f, 0x00,		/*  */
159	0x10, 0x00,		/*  */
160	0x11, 0x00,		/*  */
161};
162
163static const unsigned char init_pal[] = {
164	0x00, MR050,		/* MR0, PAL enabled */
165	0x01, 0x00,		/* MR1 */
166	0x02, 0x0c,		/* subc. freq. */
167	0x03, 0x8c,		/* subc. freq. */
168	0x04, 0x79,		/* subc. freq. */
169	0x05, 0x26,		/* subc. freq. */
170	0x06, 0x40,		/* subc. phase */
171};
172
173static const unsigned char init_ntsc[] = {
174	0x00, MR060,		/* MR0, NTSC enabled */
175	0x01, 0x00,		/* MR1 */
176	0x02, 0x55,		/* subc. freq. */
177	0x03, 0x55,		/* subc. freq. */
178	0x04, 0x55,		/* subc. freq. */
179	0x05, 0x25,		/* subc. freq. */
180	0x06, 0x1a,		/* subc. phase */
181};
182
183static int adv7175_init(struct v4l2_subdev *sd, u32 val)
184{
185	/* This is just for testing!!! */
186	adv7175_write_block(sd, init_common, sizeof(init_common));
187	adv7175_write(sd, 0x07, TR0MODE | TR0RST);
188	adv7175_write(sd, 0x07, TR0MODE);
189	return 0;
190}
191
192static int adv7175_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
193{
194	struct adv7175 *encoder = to_adv7175(sd);
195
196	if (std & V4L2_STD_NTSC) {
197		adv7175_write_block(sd, init_ntsc, sizeof(init_ntsc));
198		if (encoder->input == 0)
199			adv7175_write(sd, 0x0d, 0x4f);	/* Enable genlock */
200		adv7175_write(sd, 0x07, TR0MODE | TR0RST);
201		adv7175_write(sd, 0x07, TR0MODE);
202	} else if (std & V4L2_STD_PAL) {
203		adv7175_write_block(sd, init_pal, sizeof(init_pal));
204		if (encoder->input == 0)
205			adv7175_write(sd, 0x0d, 0x4f);	/* Enable genlock */
206		adv7175_write(sd, 0x07, TR0MODE | TR0RST);
207		adv7175_write(sd, 0x07, TR0MODE);
208	} else if (std & V4L2_STD_SECAM) {
209		/* This is an attempt to convert
210		 * SECAM->PAL (typically it does not work
211		 * due to genlock: when decoder is in SECAM
212		 * and encoder in in PAL the subcarrier can
213		 * not be synchronized with horizontal
214		 * quency) */
215		adv7175_write_block(sd, init_pal, sizeof(init_pal));
216		if (encoder->input == 0)
217			adv7175_write(sd, 0x0d, 0x49);	/* Disable genlock */
218		adv7175_write(sd, 0x07, TR0MODE | TR0RST);
219		adv7175_write(sd, 0x07, TR0MODE);
220	} else {
221		v4l2_dbg(1, debug, sd, "illegal norm: %llx\n",
222				(unsigned long long)std);
223		return -EINVAL;
224	}
225	v4l2_dbg(1, debug, sd, "switched to %llx\n", (unsigned long long)std);
226	encoder->norm = std;
227	return 0;
228}
229
230static int adv7175_s_routing(struct v4l2_subdev *sd,
231			     u32 input, u32 output, u32 config)
232{
233	struct adv7175 *encoder = to_adv7175(sd);
234
235	/* RJ: input = 0: input is from decoder
236	   input = 1: input is from ZR36060
237	   input = 2: color bar */
238
239	switch (input) {
240	case 0:
241		adv7175_write(sd, 0x01, 0x00);
242
243		if (encoder->norm & V4L2_STD_NTSC)
244			set_subcarrier_freq(sd, 1);
245
246		adv7175_write(sd, 0x0c, TR1CAPT);	/* TR1 */
247		if (encoder->norm & V4L2_STD_SECAM)
248			adv7175_write(sd, 0x0d, 0x49);	/* Disable genlock */
249		else
250			adv7175_write(sd, 0x0d, 0x4f);	/* Enable genlock */
251		adv7175_write(sd, 0x07, TR0MODE | TR0RST);
252		adv7175_write(sd, 0x07, TR0MODE);
253		/*udelay(10);*/
254		break;
255
256	case 1:
257		adv7175_write(sd, 0x01, 0x00);
258
259		if (encoder->norm & V4L2_STD_NTSC)
260			set_subcarrier_freq(sd, 0);
261
262		adv7175_write(sd, 0x0c, TR1PLAY);	/* TR1 */
263		adv7175_write(sd, 0x0d, 0x49);
264		adv7175_write(sd, 0x07, TR0MODE | TR0RST);
265		adv7175_write(sd, 0x07, TR0MODE);
266		/* udelay(10); */
267		break;
268
269	case 2:
270		adv7175_write(sd, 0x01, 0x80);
271
272		if (encoder->norm & V4L2_STD_NTSC)
273			set_subcarrier_freq(sd, 0);
274
275		adv7175_write(sd, 0x0d, 0x49);
276		adv7175_write(sd, 0x07, TR0MODE | TR0RST);
277		adv7175_write(sd, 0x07, TR0MODE);
278		/* udelay(10); */
279		break;
280
281	default:
282		v4l2_dbg(1, debug, sd, "illegal input: %d\n", input);
283		return -EINVAL;
284	}
285	v4l2_dbg(1, debug, sd, "switched to %s\n", inputs[input]);
286	encoder->input = input;
287	return 0;
288}
289
290static int adv7175_enum_mbus_code(struct v4l2_subdev *sd,
291		struct v4l2_subdev_state *sd_state,
292		struct v4l2_subdev_mbus_code_enum *code)
293{
294	if (code->pad || code->index >= ARRAY_SIZE(adv7175_codes))
295		return -EINVAL;
296
297	code->code = adv7175_codes[code->index];
298	return 0;
299}
300
301static int adv7175_get_fmt(struct v4l2_subdev *sd,
302		struct v4l2_subdev_state *sd_state,
303		struct v4l2_subdev_format *format)
304{
305	struct v4l2_mbus_framefmt *mf = &format->format;
306	u8 val = adv7175_read(sd, 0x7);
307
308	if (format->pad)
309		return -EINVAL;
310
311	if ((val & 0x40) == (1 << 6))
312		mf->code = MEDIA_BUS_FMT_UYVY8_1X16;
313	else
314		mf->code = MEDIA_BUS_FMT_UYVY8_2X8;
315
316	mf->colorspace  = V4L2_COLORSPACE_SMPTE170M;
317	mf->width       = 0;
318	mf->height      = 0;
319	mf->field       = V4L2_FIELD_ANY;
320
321	return 0;
322}
323
324static int adv7175_set_fmt(struct v4l2_subdev *sd,
325		struct v4l2_subdev_state *sd_state,
326		struct v4l2_subdev_format *format)
327{
328	struct v4l2_mbus_framefmt *mf = &format->format;
329	u8 val = adv7175_read(sd, 0x7);
330	int ret = 0;
331
332	if (format->pad)
333		return -EINVAL;
334
335	switch (mf->code) {
336	case MEDIA_BUS_FMT_UYVY8_2X8:
337		val &= ~0x40;
338		break;
339
340	case MEDIA_BUS_FMT_UYVY8_1X16:
341		val |= 0x40;
342		break;
343
344	default:
345		v4l2_dbg(1, debug, sd,
346			"illegal v4l2_mbus_framefmt code: %d\n", mf->code);
347		return -EINVAL;
348	}
349
350	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
351		ret = adv7175_write(sd, 0x7, val);
352
353	return ret;
354}
355
356static int adv7175_s_power(struct v4l2_subdev *sd, int on)
357{
358	if (on)
359		adv7175_write(sd, 0x01, 0x00);
360	else
361		adv7175_write(sd, 0x01, 0x78);
362
363	return 0;
364}
365
366/* ----------------------------------------------------------------------- */
367
368static const struct v4l2_subdev_core_ops adv7175_core_ops = {
369	.init = adv7175_init,
370	.s_power = adv7175_s_power,
371};
372
373static const struct v4l2_subdev_video_ops adv7175_video_ops = {
374	.s_std_output = adv7175_s_std_output,
375	.s_routing = adv7175_s_routing,
376};
377
378static const struct v4l2_subdev_pad_ops adv7175_pad_ops = {
379	.enum_mbus_code = adv7175_enum_mbus_code,
380	.get_fmt = adv7175_get_fmt,
381	.set_fmt = adv7175_set_fmt,
382};
383
384static const struct v4l2_subdev_ops adv7175_ops = {
385	.core = &adv7175_core_ops,
386	.video = &adv7175_video_ops,
387	.pad = &adv7175_pad_ops,
388};
389
390/* ----------------------------------------------------------------------- */
391
392static int adv7175_probe(struct i2c_client *client)
393{
394	int i;
395	struct adv7175 *encoder;
396	struct v4l2_subdev *sd;
397
398	/* Check if the adapter supports the needed features */
399	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
400		return -ENODEV;
401
402	v4l_info(client, "chip found @ 0x%x (%s)\n",
403			client->addr << 1, client->adapter->name);
404
405	encoder = devm_kzalloc(&client->dev, sizeof(*encoder), GFP_KERNEL);
406	if (encoder == NULL)
407		return -ENOMEM;
408	sd = &encoder->sd;
409	v4l2_i2c_subdev_init(sd, client, &adv7175_ops);
410	encoder->norm = V4L2_STD_NTSC;
411	encoder->input = 0;
412
413	i = adv7175_write_block(sd, init_common, sizeof(init_common));
414	if (i >= 0) {
415		i = adv7175_write(sd, 0x07, TR0MODE | TR0RST);
416		i = adv7175_write(sd, 0x07, TR0MODE);
417		i = adv7175_read(sd, 0x12);
418		v4l2_dbg(1, debug, sd, "revision %d\n", i & 1);
419	}
420	if (i < 0)
421		v4l2_dbg(1, debug, sd, "init error 0x%x\n", i);
422	return 0;
423}
424
425static void adv7175_remove(struct i2c_client *client)
426{
427	struct v4l2_subdev *sd = i2c_get_clientdata(client);
428
429	v4l2_device_unregister_subdev(sd);
430}
431
432/* ----------------------------------------------------------------------- */
433
434static const struct i2c_device_id adv7175_id[] = {
435	{ "adv7175", 0 },
436	{ "adv7176", 0 },
437	{ }
438};
439MODULE_DEVICE_TABLE(i2c, adv7175_id);
440
441static struct i2c_driver adv7175_driver = {
442	.driver = {
443		.name	= "adv7175",
444	},
445	.probe		= adv7175_probe,
446	.remove		= adv7175_remove,
447	.id_table	= adv7175_id,
448};
449
450module_i2c_driver(adv7175_driver);
451