summaryrefslogtreecommitdiff
path: root/drivers/media/i2c/ak881x.c
blob: ce840adc2aa7fe42ce7dd3f29d5dbe9c6986b68f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for AK8813 / AK8814 TV-ecoders from Asahi Kasei Microsystems Co., Ltd. (AKM)
 *
 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 */

#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/module.h>

#include <media/i2c/ak881x.h>
#include <media/v4l2-common.h>
#include <media/v4l2-device.h>

#define AK881X_INTERFACE_MODE	0
#define AK881X_VIDEO_PROCESS1	1
#define AK881X_VIDEO_PROCESS2	2
#define AK881X_VIDEO_PROCESS3	3
#define AK881X_DAC_MODE		5
#define AK881X_STATUS		0x24
#define AK881X_DEVICE_ID	0x25
#define AK881X_DEVICE_REVISION	0x26

struct ak881x {
	struct v4l2_subdev subdev;
	struct ak881x_pdata *pdata;
	unsigned int lines;
	char revision;	/* DEVICE_REVISION content */
};

static int reg_read(struct i2c_client *client, const u8 reg)
{
	return i2c_smbus_read_byte_data(client, reg);
}

static int reg_write(struct i2c_client *client, const u8 reg,
		     const u8 data)
{
	return i2c_smbus_write_byte_data(client, reg, data);
}

static int reg_set(struct i2c_client *client, const u8 reg,
		   const u8 data, u8 mask)
{
	int ret = reg_read(client, reg);
	if (ret < 0)
		return ret;
	return reg_write(client, reg, (ret & ~mask) | (data & mask));
}

static struct ak881x *to_ak881x(const struct i2c_client *client)
{
	return container_of(i2c_get_clientdata(client), struct ak881x, subdev);
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int ak881x_g_register(struct v4l2_subdev *sd,
			     struct v4l2_dbg_register *reg)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (reg->reg > 0x26)
		return -EINVAL;

	reg->size = 1;
	reg->val = reg_read(client, reg->reg);

	if (reg->val > 0xffff)
		return -EIO;

	return 0;
}

static int ak881x_s_register(struct v4l2_subdev *sd,
			     const struct v4l2_dbg_register *reg)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (reg->reg > 0x26)
		return -EINVAL;

	if (reg_write(client, reg->reg, reg->val) < 0)
		return -EIO;

	return 0;
}
#endif

static int ak881x_fill_fmt(struct v4l2_subdev *sd,
		struct v4l2_subdev_state *sd_state,
		struct v4l2_subdev_format *format)
{
	struct v4l2_mbus_framefmt *mf = &format->format;
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct ak881x *ak881x = to_ak881x(client);

	if (format->pad)
		return -EINVAL;

	v4l_bound_align_image(&mf->width, 0, 720, 2,
			      &mf->height, 0, ak881x->lines, 1, 0);
	mf->field	= V4L2_FIELD_INTERLACED;
	mf->code	= MEDIA_BUS_FMT_YUYV8_2X8;
	mf->colorspace	= V4L2_COLORSPACE_SMPTE170M;

	return 0;
}

static int ak881x_enum_mbus_code(struct v4l2_subdev *sd,
		struct v4l2_subdev_state *sd_state,
		struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->pad || code->index)
		return -EINVAL;

	code->code = MEDIA_BUS_FMT_YUYV8_2X8;
	return 0;
}

static int ak881x_get_selection(struct v4l2_subdev *sd,
				struct v4l2_subdev_state *sd_state,
				struct v4l2_subdev_selection *sel)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct ak881x *ak881x = to_ak881x(client);

	if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
		return -EINVAL;

	switch (sel->target) {
	case V4L2_SEL_TGT_CROP_BOUNDS:
		sel->r.left = 0;
		sel->r.top = 0;
		sel->r.width = 720;
		sel->r.height = ak881x->lines;
		return 0;
	default:
		return -EINVAL;
	}
}

static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct ak881x *ak881x = to_ak881x(client);
	u8 vp1;

	if (std == V4L2_STD_NTSC_443) {
		vp1 = 3;
		ak881x->lines = 480;
	} else if (std == V4L2_STD_PAL_M) {
		vp1 = 5;
		ak881x->lines = 480;
	} else if (std == V4L2_STD_PAL_60) {
		vp1 = 7;
		ak881x->lines = 480;
	} else if (std & V4L2_STD_NTSC) {
		vp1 = 0;
		ak881x->lines = 480;
	} else if (std & V4L2_STD_PAL) {
		vp1 = 0xf;
		ak881x->lines = 576;
	} else {
		/* No SECAM or PAL_N/Nc supported */
		return -EINVAL;
	}

	reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf);

	return 0;
}

static int ak881x_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct ak881x *ak881x = to_ak881x(client);

	if (enable) {
		u8 dac;
		/* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */
		/* Default: composite output */
		if (ak881x->pdata->flags & AK881X_COMPONENT)
			dac = 3;
		else
			dac = 4;
		/* Turn on the DAC(s) */
		reg_write(client, AK881X_DAC_MODE, dac);
		dev_dbg(&client->dev, "chip status 0x%x\n",
			reg_read(client, AK881X_STATUS));
	} else {
		/* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */
		reg_write(client, AK881X_DAC_MODE, 0);
		dev_dbg(&client->dev, "chip status 0x%x\n",
			reg_read(client, AK881X_STATUS));
	}

	return 0;
}

static const struct v4l2_subdev_core_ops ak881x_subdev_core_ops = {
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.g_register	= ak881x_g_register,
	.s_register	= ak881x_s_register,
#endif
};

static const struct v4l2_subdev_video_ops ak881x_subdev_video_ops = {
	.s_std_output	= ak881x_s_std_output,
	.s_stream	= ak881x_s_stream,
};

static const struct v4l2_subdev_pad_ops ak881x_subdev_pad_ops = {
	.enum_mbus_code = ak881x_enum_mbus_code,
	.get_selection	= ak881x_get_selection,
	.set_fmt	= ak881x_fill_fmt,
	.get_fmt	= ak881x_fill_fmt,
};

static const struct v4l2_subdev_ops ak881x_subdev_ops = {
	.core	= &ak881x_subdev_core_ops,
	.video	= &ak881x_subdev_video_ops,
	.pad	= &ak881x_subdev_pad_ops,
};

static int ak881x_probe(struct i2c_client *client)
{
	struct i2c_adapter *adapter = client->adapter;
	struct ak881x *ak881x;
	u8 ifmode, data;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
		dev_warn(&adapter->dev,
			 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
		return -EIO;
	}

	ak881x = devm_kzalloc(&client->dev, sizeof(*ak881x), GFP_KERNEL);
	if (!ak881x)
		return -ENOMEM;

	v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops);

	data = reg_read(client, AK881X_DEVICE_ID);

	switch (data) {
	case 0x13:
	case 0x14:
		break;
	default:
		dev_err(&client->dev,
			"No ak881x chip detected, register read %x\n", data);
		return -ENODEV;
	}

	ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION);
	ak881x->pdata = client->dev.platform_data;

	if (ak881x->pdata) {
		if (ak881x->pdata->flags & AK881X_FIELD)
			ifmode = 4;
		else
			ifmode = 0;

		switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) {
		case AK881X_IF_MODE_BT656:
			ifmode |= 1;
			break;
		case AK881X_IF_MODE_MASTER:
			ifmode |= 2;
			break;
		case AK881X_IF_MODE_SLAVE:
		default:
			break;
		}

		dev_dbg(&client->dev, "IF mode %x\n", ifmode);

		/*
		 * "Line Blanking No." seems to be the same as the number of
		 * "black" lines on, e.g., SuperH VOU, whose default value of 20
		 * "incidentally" matches ak881x' default
		 */
		reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3));
	}

	/* Hardware default: NTSC-M */
	ak881x->lines = 480;

	dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n",
		 data, ak881x->revision);

	return 0;
}

static void ak881x_remove(struct i2c_client *client)
{
	struct ak881x *ak881x = to_ak881x(client);

	v4l2_device_unregister_subdev(&ak881x->subdev);
}

static const struct i2c_device_id ak881x_id[] = {
	{ "ak8813", 0 },
	{ "ak8814", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ak881x_id);

static struct i2c_driver ak881x_i2c_driver = {
	.driver = {
		.name = "ak881x",
	},
	.probe		= ak881x_probe,
	.remove		= ak881x_remove,
	.id_table	= ak881x_id,
};

module_i2c_driver(ak881x_i2c_driver);

MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814");
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_LICENSE("GPL v2");