tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 .s_std = vp27smpx_s_std,
128};
129
130static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
131 .s_radio = vp27smpx_s_radio,
132 .s_tuner = vp27smpx_s_tuner,
133 .g_tuner = vp27smpx_g_tuner,
134};
135
136static const struct v4l2_subdev_ops vp27smpx_ops = {
137 .core = &vp27smpx_core_ops,
138 .tuner = &vp27smpx_tuner_ops,
139};
140
141/* ----------------------------------------------------------------------- */
142
143/* i2c implementation */
144
145/*
146 * Generic i2c probe
147 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
148 */
149
150static int vp27smpx_probe(struct i2c_client *client,
151 const struct i2c_device_id *id)
152{
153 struct vp27smpx_state *state;
154 struct v4l2_subdev *sd;
155
156 /* Check if the adapter supports the needed features */
157 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
158 return -EIO;
159
160 v4l_info(client, "chip found @ 0x%x (%s)\n",
161 client->addr << 1, client->adapter->name);
162
163 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
164 if (state == NULL)
165 return -ENOMEM;
166 sd = &state->sd;
167 v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
168 state->audmode = V4L2_TUNER_MODE_STEREO;
169
170 /* initialize vp27smpx */
171 vp27smpx_set_audmode(sd, state->audmode);
172 return 0;
173}
174
175static int vp27smpx_remove(struct i2c_client *client)
176{
177 struct v4l2_subdev *sd = i2c_get_clientdata(client);
178
179 v4l2_device_unregister_subdev(sd);
180 return 0;
181}
182
183/* ----------------------------------------------------------------------- */
184
185static const struct i2c_device_id vp27smpx_id[] = {
186 { "vp27smpx", 0 },
187 { }
188};
189MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
190
191static struct i2c_driver vp27smpx_driver = {
192 .driver = {
193 .owner = THIS_MODULE,
194 .name = "vp27smpx",
195 },
196 .probe = vp27smpx_probe,
197 .remove = vp27smpx_remove,
198 .id_table = vp27smpx_id,
199};
200
201module_i2c_driver(vp27smpx_driver);