97e24769e65b22ebb2a84beb3d37c65c77ec2dec
[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 static unsigned short normal_i2c[] = { 0xb6 >> 1, I2C_CLIENT_END };
40
41
42 I2C_CLIENT_INSMOD;
43
44 /* ----------------------------------------------------------------------- */
45
46 struct vp27smpx_state {
47         int radio;
48         u32 audmode;
49 };
50
51 static void vp27smpx_set_audmode(struct i2c_client *client, u32 audmode)
52 {
53         struct vp27smpx_state *state = i2c_get_clientdata(client);
54         u8 data[3] = { 0x00, 0x00, 0x04 };
55
56         switch (audmode) {
57                 case V4L2_TUNER_MODE_MONO:
58                 case V4L2_TUNER_MODE_LANG1:
59                         break;
60                 case V4L2_TUNER_MODE_STEREO:
61                 case V4L2_TUNER_MODE_LANG1_LANG2:
62                         data[1] = 0x01;
63                         break;
64                 case V4L2_TUNER_MODE_LANG2:
65                         data[1] = 0x02;
66                         break;
67         }
68
69         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data)) {
70                 v4l_err(client, "%s: I/O error setting audmode\n", client->name);
71         }
72         else {
73                 state->audmode = audmode;
74         }
75 }
76
77 static int vp27smpx_command(struct i2c_client *client, unsigned int cmd, void *arg)
78 {
79         struct vp27smpx_state *state = i2c_get_clientdata(client);
80         struct v4l2_tuner *vt = arg;
81
82         switch (cmd) {
83         case AUDC_SET_RADIO:
84                 state->radio = 1;
85                 break;
86
87         case VIDIOC_S_STD:
88                 state->radio = 0;
89                 break;
90
91         case VIDIOC_S_TUNER:
92                 if (!state->radio)
93                         vp27smpx_set_audmode(client, vt->audmode);
94                 break;
95
96         case VIDIOC_G_TUNER:
97                 if (state->radio)
98                         break;
99                 vt->audmode = state->audmode;
100                 vt->capability = V4L2_TUNER_CAP_STEREO |
101                         V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
102                 vt->rxsubchans = V4L2_TUNER_SUB_MONO;
103                 break;
104
105         case VIDIOC_G_CHIP_IDENT:
106                 return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_VP27SMPX, 0);
107
108         case VIDIOC_LOG_STATUS:
109                 v4l_info(client, "Audio Mode: %u%s\n", state->audmode,
110                                 state->radio ? " (Radio)" : "");
111                 break;
112
113         default:
114                 return -EINVAL;
115         }
116         return 0;
117 }
118
119 /* ----------------------------------------------------------------------- */
120
121 /* i2c implementation */
122
123 /*
124  * Generic i2c probe
125  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
126  */
127
128 static int vp27smpx_probe(struct i2c_client *client)
129 {
130         struct vp27smpx_state *state;
131
132         /* Check if the adapter supports the needed features */
133         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
134                 return -EIO;
135
136         snprintf(client->name, sizeof(client->name) - 1, "vp27smpx");
137
138         v4l_info(client, "chip found @ 0x%x (%s)\n", client->addr << 1, client->adapter->name);
139
140         state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
141         if (state == NULL) {
142                 return -ENOMEM;
143         }
144         state->audmode = V4L2_TUNER_MODE_STEREO;
145         i2c_set_clientdata(client, state);
146
147         /* initialize vp27smpx */
148         vp27smpx_set_audmode(client, state->audmode);
149         return 0;
150 }
151
152 static int vp27smpx_remove(struct i2c_client *client)
153 {
154         kfree(i2c_get_clientdata(client));
155         return 0;
156 }
157
158 /* ----------------------------------------------------------------------- */
159
160 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
161         .name = "vp27smpx",
162         .driverid = I2C_DRIVERID_VP27SMPX,
163         .command = vp27smpx_command,
164         .probe = vp27smpx_probe,
165         .remove = vp27smpx_remove,
166 };
167