Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6
[pandora-kernel.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/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 #include <media/v4l2-chip-ident.h>
33
34 MODULE_DESCRIPTION("vp27smpx driver");
35 MODULE_AUTHOR("Hans Verkuil");
36 MODULE_LICENSE("GPL");
37
38
39 /* ----------------------------------------------------------------------- */
40
41 struct vp27smpx_state {
42         struct v4l2_subdev sd;
43         int radio;
44         u32 audmode;
45 };
46
47 static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
48 {
49         return container_of(sd, struct vp27smpx_state, sd);
50 }
51
52 static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
53 {
54         struct vp27smpx_state *state = to_state(sd);
55         struct i2c_client *client = v4l2_get_subdevdata(sd);
56         u8 data[3] = { 0x00, 0x00, 0x04 };
57
58         switch (audmode) {
59         case V4L2_TUNER_MODE_MONO:
60         case V4L2_TUNER_MODE_LANG1:
61                 break;
62         case V4L2_TUNER_MODE_STEREO:
63         case V4L2_TUNER_MODE_LANG1_LANG2:
64                 data[1] = 0x01;
65                 break;
66         case V4L2_TUNER_MODE_LANG2:
67                 data[1] = 0x02;
68                 break;
69         }
70
71         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
72                 v4l2_err(sd, "I/O error setting audmode\n");
73         else
74                 state->audmode = audmode;
75 }
76
77 static int vp27smpx_s_radio(struct v4l2_subdev *sd)
78 {
79         struct vp27smpx_state *state = to_state(sd);
80
81         state->radio = 1;
82         return 0;
83 }
84
85 static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
86 {
87         struct vp27smpx_state *state = to_state(sd);
88
89         state->radio = 0;
90         return 0;
91 }
92
93 static int vp27smpx_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
94 {
95         struct vp27smpx_state *state = to_state(sd);
96
97         if (!state->radio)
98                 vp27smpx_set_audmode(sd, vt->audmode);
99         return 0;
100 }
101
102 static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
103 {
104         struct vp27smpx_state *state = to_state(sd);
105
106         if (state->radio)
107                 return 0;
108         vt->audmode = state->audmode;
109         vt->capability = V4L2_TUNER_CAP_STEREO |
110                 V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
111         vt->rxsubchans = V4L2_TUNER_SUB_MONO;
112         return 0;
113 }
114
115 static int vp27smpx_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
116 {
117         struct i2c_client *client = v4l2_get_subdevdata(sd);
118
119         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_VP27SMPX, 0);
120 }
121
122 static int vp27smpx_log_status(struct v4l2_subdev *sd)
123 {
124         struct vp27smpx_state *state = to_state(sd);
125
126         v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
127                         state->radio ? " (Radio)" : "");
128         return 0;
129 }
130
131 /* ----------------------------------------------------------------------- */
132
133 static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
134         .log_status = vp27smpx_log_status,
135         .g_chip_ident = vp27smpx_g_chip_ident,
136         .s_std = vp27smpx_s_std,
137 };
138
139 static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
140         .s_radio = vp27smpx_s_radio,
141         .s_tuner = vp27smpx_s_tuner,
142         .g_tuner = vp27smpx_g_tuner,
143 };
144
145 static const struct v4l2_subdev_ops vp27smpx_ops = {
146         .core = &vp27smpx_core_ops,
147         .tuner = &vp27smpx_tuner_ops,
148 };
149
150 /* ----------------------------------------------------------------------- */
151
152 /* i2c implementation */
153
154 /*
155  * Generic i2c probe
156  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
157  */
158
159 static int vp27smpx_probe(struct i2c_client *client,
160                           const struct i2c_device_id *id)
161 {
162         struct vp27smpx_state *state;
163         struct v4l2_subdev *sd;
164
165         /* Check if the adapter supports the needed features */
166         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
167                 return -EIO;
168
169         v4l_info(client, "chip found @ 0x%x (%s)\n",
170                         client->addr << 1, client->adapter->name);
171
172         state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
173         if (state == NULL)
174                 return -ENOMEM;
175         sd = &state->sd;
176         v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
177         state->audmode = V4L2_TUNER_MODE_STEREO;
178
179         /* initialize vp27smpx */
180         vp27smpx_set_audmode(sd, state->audmode);
181         return 0;
182 }
183
184 static int vp27smpx_remove(struct i2c_client *client)
185 {
186         struct v4l2_subdev *sd = i2c_get_clientdata(client);
187
188         v4l2_device_unregister_subdev(sd);
189         kfree(to_state(sd));
190         return 0;
191 }
192
193 /* ----------------------------------------------------------------------- */
194
195 static const struct i2c_device_id vp27smpx_id[] = {
196         { "vp27smpx", 0 },
197         { }
198 };
199 MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
200
201 static struct i2c_driver vp27smpx_driver = {
202         .driver = {
203                 .owner  = THIS_MODULE,
204                 .name   = "vp27smpx",
205         },
206         .probe          = vp27smpx_probe,
207         .remove         = vp27smpx_remove,
208         .id_table       = vp27smpx_id,
209 };
210
211 static __init int init_vp27smpx(void)
212 {
213         return i2c_add_driver(&vp27smpx_driver);
214 }
215
216 static __exit void exit_vp27smpx(void)
217 {
218         i2c_del_driver(&vp27smpx_driver);
219 }
220
221 module_init(init_vp27smpx);
222 module_exit(exit_vp27smpx);