Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / drivers / media / video / cs5345.c
1 /*
2  * cs5345 Cirrus Logic 24-bit, 192 kHz Stereo Audio ADC
3  * Copyright (C) 2007 Hans Verkuil
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18  */
19
20
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/i2c.h>
24 #include <linux/videodev2.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-chip-ident.h>
27 #include <media/v4l2-i2c-drv.h>
28
29 MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
30 MODULE_AUTHOR("Hans Verkuil");
31 MODULE_LICENSE("GPL");
32
33 static int debug;
34
35 module_param(debug, bool, 0644);
36
37 MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
38
39
40 /* ----------------------------------------------------------------------- */
41
42 static inline int cs5345_write(struct v4l2_subdev *sd, u8 reg, u8 value)
43 {
44         struct i2c_client *client = v4l2_get_subdevdata(sd);
45
46         return i2c_smbus_write_byte_data(client, reg, value);
47 }
48
49 static inline int cs5345_read(struct v4l2_subdev *sd, u8 reg)
50 {
51         struct i2c_client *client = v4l2_get_subdevdata(sd);
52
53         return i2c_smbus_read_byte_data(client, reg);
54 }
55
56 static int cs5345_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
57 {
58         if ((route->input & 0xf) > 6) {
59                 v4l2_err(sd, "Invalid input %d.\n", route->input);
60                 return -EINVAL;
61         }
62         cs5345_write(sd, 0x09, route->input & 0xf);
63         cs5345_write(sd, 0x05, route->input & 0xf0);
64         return 0;
65 }
66
67 static int cs5345_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
68 {
69         if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
70                 ctrl->value = (cs5345_read(sd, 0x04) & 0x08) != 0;
71                 return 0;
72         }
73         if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
74                 return -EINVAL;
75         ctrl->value = cs5345_read(sd, 0x07) & 0x3f;
76         if (ctrl->value >= 32)
77                 ctrl->value = ctrl->value - 64;
78         return 0;
79 }
80
81 static int cs5345_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
82 {
83         if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
84                 cs5345_write(sd, 0x04, ctrl->value ? 0x80 : 0);
85                 return 0;
86         }
87         if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
88                 return -EINVAL;
89         if (ctrl->value > 24 || ctrl->value < -24)
90                 return -EINVAL;
91         cs5345_write(sd, 0x07, ((u8)ctrl->value) & 0x3f);
92         cs5345_write(sd, 0x08, ((u8)ctrl->value) & 0x3f);
93         return 0;
94 }
95
96 #ifdef CONFIG_VIDEO_ADV_DEBUG
97 static int cs5345_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
98 {
99         struct i2c_client *client = v4l2_get_subdevdata(sd);
100
101         if (!v4l2_chip_match_i2c_client(client, &reg->match))
102                 return -EINVAL;
103         if (!capable(CAP_SYS_ADMIN))
104                 return -EPERM;
105         reg->size = 1;
106         reg->val = cs5345_read(sd, reg->reg & 0x1f);
107         return 0;
108 }
109
110 static int cs5345_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
111 {
112         struct i2c_client *client = v4l2_get_subdevdata(sd);
113
114         if (!v4l2_chip_match_i2c_client(client, &reg->match))
115                 return -EINVAL;
116         if (!capable(CAP_SYS_ADMIN))
117                 return -EPERM;
118         cs5345_write(sd, reg->reg & 0x1f, reg->val & 0xff);
119         return 0;
120 }
121 #endif
122
123 static int cs5345_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
124 {
125         struct i2c_client *client = v4l2_get_subdevdata(sd);
126
127         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_CS5345, 0);
128 }
129
130 static int cs5345_log_status(struct v4l2_subdev *sd)
131 {
132         u8 v = cs5345_read(sd, 0x09) & 7;
133         u8 m = cs5345_read(sd, 0x04);
134         int vol = cs5345_read(sd, 0x08) & 0x3f;
135
136         v4l2_info(sd, "Input:  %d%s\n", v,
137                         (m & 0x80) ? " (muted)" : "");
138         if (vol >= 32)
139                 vol = vol - 64;
140         v4l2_info(sd, "Volume: %d dB\n", vol);
141         return 0;
142 }
143
144 static int cs5345_command(struct i2c_client *client, unsigned cmd, void *arg)
145 {
146         return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
147 }
148
149 /* ----------------------------------------------------------------------- */
150
151 static const struct v4l2_subdev_core_ops cs5345_core_ops = {
152         .log_status = cs5345_log_status,
153         .g_chip_ident = cs5345_g_chip_ident,
154         .g_ctrl = cs5345_g_ctrl,
155         .s_ctrl = cs5345_s_ctrl,
156 #ifdef CONFIG_VIDEO_ADV_DEBUG
157         .g_register = cs5345_g_register,
158         .s_register = cs5345_s_register,
159 #endif
160 };
161
162 static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
163         .s_routing = cs5345_s_routing,
164 };
165
166 static const struct v4l2_subdev_ops cs5345_ops = {
167         .core = &cs5345_core_ops,
168         .audio = &cs5345_audio_ops,
169 };
170
171 /* ----------------------------------------------------------------------- */
172
173 static int cs5345_probe(struct i2c_client *client,
174                         const struct i2c_device_id *id)
175 {
176         struct v4l2_subdev *sd;
177
178         /* Check if the adapter supports the needed features */
179         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
180                 return -EIO;
181
182         v4l_info(client, "chip found @ 0x%x (%s)\n",
183                         client->addr << 1, client->adapter->name);
184
185         sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
186         if (sd == NULL)
187                 return -ENOMEM;
188         v4l2_i2c_subdev_init(sd, client, &cs5345_ops);
189
190         cs5345_write(sd, 0x02, 0x00);
191         cs5345_write(sd, 0x04, 0x01);
192         cs5345_write(sd, 0x09, 0x01);
193         return 0;
194 }
195
196 /* ----------------------------------------------------------------------- */
197
198 static int cs5345_remove(struct i2c_client *client)
199 {
200         struct v4l2_subdev *sd = i2c_get_clientdata(client);
201
202         v4l2_device_unregister_subdev(sd);
203         kfree(sd);
204         return 0;
205 }
206
207 /* ----------------------------------------------------------------------- */
208
209 static const struct i2c_device_id cs5345_id[] = {
210         { "cs5345", 0 },
211         { }
212 };
213 MODULE_DEVICE_TABLE(i2c, cs5345_id);
214
215 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
216         .name = "cs5345",
217         .driverid = I2C_DRIVERID_CS5345,
218         .command = cs5345_command,
219         .probe = cs5345_probe,
220         .remove = cs5345_remove,
221         .id_table = cs5345_id,
222 };