1/*
2 * vp27smpx - driver version 0.0.1
3 *
4 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
5 *
6 * Based on a tvaudio patch from Takahiro Adachi <tadachi@tadachi-net.com>
7 * and Kazuhiko Kawakami <kazz-0@mail.goo.ne.jp>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24#include <linux/module.h>
25#include <linux/types.h>
26#include <linux/slab.h>
27#include <linux/ioctl.h>
28#include <asm/uaccess.h>
29#include <linux/i2c.h>
30#include <linux/videodev2.h>
31#include <media/v4l2-device.h>
32
33MODULE_DESCRIPTION("vp27smpx driver");
34MODULE_AUTHOR("Hans Verkuil");
35MODULE_LICENSE("GPL");
36
37
38/* ----------------------------------------------------------------------- */
39
40struct vp27smpx_state {
41	struct v4l2_subdev sd;
42	int radio;
43	u32 audmode;
44};
45
46static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
47{
48	return container_of(sd, struct vp27smpx_state, sd);
49}
50
51static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
52{
53	struct vp27smpx_state *state = to_state(sd);
54	struct i2c_client *client = v4l2_get_subdevdata(sd);
55	u8 data[3] = { 0x00, 0x00, 0x04 };
56
57	switch (audmode) {
58	case V4L2_TUNER_MODE_MONO:
59	case V4L2_TUNER_MODE_LANG1:
60		break;
61	case V4L2_TUNER_MODE_STEREO:
62	case V4L2_TUNER_MODE_LANG1_LANG2:
63		data[1] = 0x01;
64		break;
65	case V4L2_TUNER_MODE_LANG2:
66		data[1] = 0x02;
67		break;
68	}
69
70	if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
71		v4l2_err(sd, "I/O error setting audmode\n");
72	else
73		state->audmode = audmode;
74}
75
76static int vp27smpx_s_radio(struct v4l2_subdev *sd)
77{
78	struct vp27smpx_state *state = to_state(sd);
79
80	state->radio = 1;
81	return 0;
82}
83
84static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
85{
86	struct vp27smpx_state *state = to_state(sd);
87
88	state->radio = 0;
89	return 0;
90}
91
92static int vp27smpx_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
93{
94	struct vp27smpx_state *state = to_state(sd);
95
96	if (!state->radio)
97		vp27smpx_set_audmode(sd, vt->audmode);
98	return 0;
99}
100
101static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
102{
103	struct vp27smpx_state *state = to_state(sd);
104
105	if (state->radio)
106		return 0;
107	vt->audmode = state->audmode;
108	vt->capability = V4L2_TUNER_CAP_STEREO |
109		V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
110	vt->rxsubchans = V4L2_TUNER_SUB_MONO;
111	return 0;
112}
113
114static int vp27smpx_log_status(struct v4l2_subdev *sd)
115{
116	struct vp27smpx_state *state = to_state(sd);
117
118	v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
119			state->radio ? " (Radio)" : "");
120	return 0;
121}
122
123/* ----------------------------------------------------------------------- */
124
125static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
126	.log_status = vp27smpx_log_status,
127};
128
129static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
130	.s_radio = vp27smpx_s_radio,
131	.s_tuner = vp27smpx_s_tuner,
132	.g_tuner = vp27smpx_g_tuner,
133};
134
135static const struct v4l2_subdev_video_ops vp27smpx_video_ops = {
136	.s_std = vp27smpx_s_std,
137};
138
139static const struct v4l2_subdev_ops vp27smpx_ops = {
140	.core = &vp27smpx_core_ops,
141	.tuner = &vp27smpx_tuner_ops,
142	.video = &vp27smpx_video_ops,
143};
144
145/* ----------------------------------------------------------------------- */
146
147/* i2c implementation */
148
149/*
150 * Generic i2c probe
151 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
152 */
153
154static int vp27smpx_probe(struct i2c_client *client,
155			  const struct i2c_device_id *id)
156{
157	struct vp27smpx_state *state;
158	struct v4l2_subdev *sd;
159
160	/* Check if the adapter supports the needed features */
161	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
162		return -EIO;
163
164	v4l_info(client, "chip found @ 0x%x (%s)\n",
165			client->addr << 1, client->adapter->name);
166
167	state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
168	if (state == NULL)
169		return -ENOMEM;
170	sd = &state->sd;
171	v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
172	state->audmode = V4L2_TUNER_MODE_STEREO;
173
174	/* initialize vp27smpx */
175	vp27smpx_set_audmode(sd, state->audmode);
176	return 0;
177}
178
179static int vp27smpx_remove(struct i2c_client *client)
180{
181	struct v4l2_subdev *sd = i2c_get_clientdata(client);
182
183	v4l2_device_unregister_subdev(sd);
184	return 0;
185}
186
187/* ----------------------------------------------------------------------- */
188
189static const struct i2c_device_id vp27smpx_id[] = {
190	{ "vp27smpx", 0 },
191	{ }
192};
193MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
194
195static struct i2c_driver vp27smpx_driver = {
196	.driver = {
197		.owner	= THIS_MODULE,
198		.name	= "vp27smpx",
199	},
200	.probe		= vp27smpx_probe,
201	.remove		= vp27smpx_remove,
202	.id_table	= vp27smpx_id,
203};
204
205module_i2c_driver(vp27smpx_driver);
206