cd98084ac090ddf75c9aaadf450211f7fc17a3ac
[linux-2.6.git] / drivers / media / video / vp27smpx.c
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/ioctl.h>
27 #include <asm/uaccess.h>
28 #include <linux/i2c.h>
29 #include <linux/i2c-id.h>
30 #include <linux/videodev.h>
31 #include <media/v4l2-common.h>
32 #include <media/v4l2-chip-ident.h>
33 #include <media/v4l2-i2c-drv-legacy.h>
34
35 MODULE_DESCRIPTION("vp27smpx driver");
36 MODULE_AUTHOR("Hans Verkuil");
37 MODULE_LICENSE("GPL");
38
39
40 /* ----------------------------------------------------------------------- */
41
42 struct vp27smpx_state {
43         int radio;
44         u32 audmode;
45 };
46
47 static void vp27smpx_set_audmode(struct i2c_client *client, u32 audmode)
48 {
49         struct vp27smpx_state *state = i2c_get_clientdata(client);
50         u8 data[3] = { 0x00, 0x00, 0x04 };
51
52         switch (audmode) {
53                 case V4L2_TUNER_MODE_MONO:
54                 case V4L2_TUNER_MODE_LANG1:
55                         break;
56                 case V4L2_TUNER_MODE_STEREO:
57                 case V4L2_TUNER_MODE_LANG1_LANG2:
58                         data[1] = 0x01;
59                         break;
60                 case V4L2_TUNER_MODE_LANG2:
61                         data[1] = 0x02;
62                         break;
63         }
64
65         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data)) {
66                 v4l_err(client, "%s: I/O error setting audmode\n", client->name);
67         }
68         else {
69                 state->audmode = audmode;
70         }
71 }
72
73 static int vp27smpx_command(struct i2c_client *client, unsigned int cmd, void *arg)
74 {
75         struct vp27smpx_state *state = i2c_get_clientdata(client);
76         struct v4l2_tuner *vt = arg;
77
78         switch (cmd) {
79         case AUDC_SET_RADIO:
80                 state->radio = 1;
81                 break;
82
83         case VIDIOC_S_STD:
84                 state->radio = 0;
85                 break;
86
87         case VIDIOC_S_TUNER:
88                 if (!state->radio)
89                         vp27smpx_set_audmode(client, vt->audmode);
90                 break;
91
92         case VIDIOC_G_TUNER:
93                 if (state->radio)
94                         break;
95                 vt->audmode = state->audmode;
96                 vt->capability = V4L2_TUNER_CAP_STEREO |
97                         V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
98                 vt->rxsubchans = V4L2_TUNER_SUB_MONO;
99                 break;
100
101         case VIDIOC_G_CHIP_IDENT:
102                 return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_VP27SMPX, 0);
103
104         case VIDIOC_LOG_STATUS:
105                 v4l_info(client, "Audio Mode: %u%s\n", state->audmode,
106                                 state->radio ? " (Radio)" : "");
107                 break;
108
109         default:
110                 return -EINVAL;
111         }
112         return 0;
113 }
114
115 /* ----------------------------------------------------------------------- */
116
117 /* i2c implementation */
118
119 /*
120  * Generic i2c probe
121  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
122  */
123
124 static int vp27smpx_probe(struct i2c_client *client)
125 {
126         struct vp27smpx_state *state;
127
128         /* Check if the adapter supports the needed features */
129         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
130                 return -EIO;
131
132         snprintf(client->name, sizeof(client->name) - 1, "vp27smpx");
133
134         v4l_info(client, "chip found @ 0x%x (%s)\n", client->addr << 1, client->adapter->name);
135
136         state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
137         if (state == NULL) {
138                 return -ENOMEM;
139         }
140         state->audmode = V4L2_TUNER_MODE_STEREO;
141         i2c_set_clientdata(client, state);
142
143         /* initialize vp27smpx */
144         vp27smpx_set_audmode(client, state->audmode);
145         return 0;
146 }
147
148 static int vp27smpx_remove(struct i2c_client *client)
149 {
150         kfree(i2c_get_clientdata(client));
151         return 0;
152 }
153
154 /* ----------------------------------------------------------------------- */
155
156 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
157         .name = "vp27smpx",
158         .driverid = I2C_DRIVERID_VP27SMPX,
159         .command = vp27smpx_command,
160         .probe = vp27smpx_probe,
161         .remove = vp27smpx_remove,
162 };
163