include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[safe/jmp/linux-2.6] / 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/i2c-id.h>
31 #include <linux/videodev2.h>
32 #include <media/v4l2-device.h>
33 #include <media/v4l2-chip-ident.h>
34 #include <media/v4l2-i2c-drv.h>
35
36 MODULE_DESCRIPTION("vp27smpx driver");
37 MODULE_AUTHOR("Hans Verkuil");
38 MODULE_LICENSE("GPL");
39
40
41 /* ----------------------------------------------------------------------- */
42
43 struct vp27smpx_state {
44         struct v4l2_subdev sd;
45         int radio;
46         u32 audmode;
47 };
48
49 static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
50 {
51         return container_of(sd, struct vp27smpx_state, sd);
52 }
53
54 static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
55 {
56         struct vp27smpx_state *state = to_state(sd);
57         struct i2c_client *client = v4l2_get_subdevdata(sd);
58         u8 data[3] = { 0x00, 0x00, 0x04 };
59
60         switch (audmode) {
61         case V4L2_TUNER_MODE_MONO:
62         case V4L2_TUNER_MODE_LANG1:
63                 break;
64         case V4L2_TUNER_MODE_STEREO:
65         case V4L2_TUNER_MODE_LANG1_LANG2:
66                 data[1] = 0x01;
67                 break;
68         case V4L2_TUNER_MODE_LANG2:
69                 data[1] = 0x02;
70                 break;
71         }
72
73         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
74                 v4l2_err(sd, "I/O error setting audmode\n");
75         else
76                 state->audmode = audmode;
77 }
78
79 static int vp27smpx_s_radio(struct v4l2_subdev *sd)
80 {
81         struct vp27smpx_state *state = to_state(sd);
82
83         state->radio = 1;
84         return 0;
85 }
86
87 static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
88 {
89         struct vp27smpx_state *state = to_state(sd);
90
91         state->radio = 0;
92         return 0;
93 }
94
95 static int vp27smpx_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
96 {
97         struct vp27smpx_state *state = to_state(sd);
98
99         if (!state->radio)
100                 vp27smpx_set_audmode(sd, vt->audmode);
101         return 0;
102 }
103
104 static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
105 {
106         struct vp27smpx_state *state = to_state(sd);
107
108         if (state->radio)
109                 return 0;
110         vt->audmode = state->audmode;
111         vt->capability = V4L2_TUNER_CAP_STEREO |
112                 V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
113         vt->rxsubchans = V4L2_TUNER_SUB_MONO;
114         return 0;
115 }
116
117 static int vp27smpx_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
118 {
119         struct i2c_client *client = v4l2_get_subdevdata(sd);
120
121         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_VP27SMPX, 0);
122 }
123
124 static int vp27smpx_log_status(struct v4l2_subdev *sd)
125 {
126         struct vp27smpx_state *state = to_state(sd);
127
128         v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
129                         state->radio ? " (Radio)" : "");
130         return 0;
131 }
132
133 /* ----------------------------------------------------------------------- */
134
135 static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
136         .log_status = vp27smpx_log_status,
137         .g_chip_ident = vp27smpx_g_chip_ident,
138         .s_std = vp27smpx_s_std,
139 };
140
141 static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
142         .s_radio = vp27smpx_s_radio,
143         .s_tuner = vp27smpx_s_tuner,
144         .g_tuner = vp27smpx_g_tuner,
145 };
146
147 static const struct v4l2_subdev_ops vp27smpx_ops = {
148         .core = &vp27smpx_core_ops,
149         .tuner = &vp27smpx_tuner_ops,
150 };
151
152 /* ----------------------------------------------------------------------- */
153
154 /* i2c implementation */
155
156 /*
157  * Generic i2c probe
158  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
159  */
160
161 static int vp27smpx_probe(struct i2c_client *client,
162                           const struct i2c_device_id *id)
163 {
164         struct vp27smpx_state *state;
165         struct v4l2_subdev *sd;
166
167         /* Check if the adapter supports the needed features */
168         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
169                 return -EIO;
170
171         v4l_info(client, "chip found @ 0x%x (%s)\n",
172                         client->addr << 1, client->adapter->name);
173
174         state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
175         if (state == NULL)
176                 return -ENOMEM;
177         sd = &state->sd;
178         v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
179         state->audmode = V4L2_TUNER_MODE_STEREO;
180
181         /* initialize vp27smpx */
182         vp27smpx_set_audmode(sd, state->audmode);
183         return 0;
184 }
185
186 static int vp27smpx_remove(struct i2c_client *client)
187 {
188         struct v4l2_subdev *sd = i2c_get_clientdata(client);
189
190         v4l2_device_unregister_subdev(sd);
191         kfree(to_state(sd));
192         return 0;
193 }
194
195 /* ----------------------------------------------------------------------- */
196
197 static const struct i2c_device_id vp27smpx_id[] = {
198         { "vp27smpx", 0 },
199         { }
200 };
201 MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
202
203 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
204         .name = "vp27smpx",
205         .probe = vp27smpx_probe,
206         .remove = vp27smpx_remove,
207         .id_table = vp27smpx_id,
208 };