aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/vp27smpx.c
blob: cbecb3cbbbaa83b9a6e1f5ddfe9283427f9af830 (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
/*
 * vp27smpx - driver version 0.0.1
 *
 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
 *
 * Based on a tvaudio patch from Takahiro Adachi <tadachi@tadachi-net.com>
 * and Kazuhiko Kawakami <kazz-0@mail.goo.ne.jp>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/ioctl.h>
#include <asm/uaccess.h>
#include <linux/i2c.h>
#include <linux/i2c-id.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-i2c-drv.h>

MODULE_DESCRIPTION("vp27smpx driver");
MODULE_AUTHOR("Hans Verkuil");
MODULE_LICENSE("GPL");


/* ----------------------------------------------------------------------- */

struct vp27smpx_state {
	int radio;
	u32 audmode;
};

static void vp27smpx_set_audmode(struct i2c_client *client, u32 audmode)
{
	struct vp27smpx_state *state = i2c_get_clientdata(client);
	u8 data[3] = { 0x00, 0x00, 0x04 };

	switch (audmode) {
	case V4L2_TUNER_MODE_MONO:
	case V4L2_TUNER_MODE_LANG1:
		break;
	case V4L2_TUNER_MODE_STEREO:
	case V4L2_TUNER_MODE_LANG1_LANG2:
		data[1] = 0x01;
		break;
	case V4L2_TUNER_MODE_LANG2:
		data[1] = 0x02;
		break;
	}

	if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
		v4l_err(client, "%s: I/O error setting audmode\n",
				client->name);
	else
		state->audmode = audmode;
}

static int vp27smpx_command(struct i2c_client *client, unsigned cmd, void *arg)
{
	struct vp27smpx_state *state = i2c_get_clientdata(client);
	struct v4l2_tuner *vt = arg;

	switch (cmd) {
	case AUDC_SET_RADIO:
		state->radio = 1;
		break;

	case VIDIOC_S_STD:
		state->radio = 0;
		break;

	case VIDIOC_S_TUNER:
		if (!state->radio)
			vp27smpx_set_audmode(client, vt->audmode);
		break;

	case VIDIOC_G_TUNER:
		if (state->radio)
			break;
		vt->audmode = state->audmode;
		vt->capability = V4L2_TUNER_CAP_STEREO |
			V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
		vt->rxsubchans = V4L2_TUNER_SUB_MONO;
		break;

	case VIDIOC_G_CHIP_IDENT:
		return v4l2_chip_ident_i2c_client(client, arg,
				V4L2_IDENT_VP27SMPX, 0);

	case VIDIOC_LOG_STATUS:
		v4l_info(client, "Audio Mode: %u%s\n", state->audmode,
				state->radio ? " (Radio)" : "");
		break;

	default:
		return -EINVAL;
	}
	return 0;
}

/* ----------------------------------------------------------------------- */

/* i2c implementation */

/*
 * Generic i2c probe
 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 */

static int vp27smpx_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct vp27smpx_state *state;

	/* Check if the adapter supports the needed features */
	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -EIO;

	v4l_info(client, "chip found @ 0x%x (%s)\n",
			client->addr << 1, client->adapter->name);

	state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
	if (state == NULL)
		return -ENOMEM;
	state->audmode = V4L2_TUNER_MODE_STEREO;
	i2c_set_clientdata(client, state);

	/* initialize vp27smpx */
	vp27smpx_set_audmode(client, state->audmode);
	return 0;
}

static int vp27smpx_remove(struct i2c_client *client)
{
	kfree(i2c_get_clientdata(client));
	return 0;
}

/* ----------------------------------------------------------------------- */

static const struct i2c_device_id vp27smpx_id[] = {
	{ "vp27smpx", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, vp27smpx_id);

static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "vp27smpx",
	.driverid = I2C_DRIVERID_VP27SMPX,
	.command = vp27smpx_command,
	.probe = vp27smpx_probe,
	.remove = vp27smpx_remove,
	.id_table = vp27smpx_id,
};

Privacy Policy