Merge branch 'for-linus' of git://git.o-hand.com/linux-mfd
[linux-2.6] / drivers / media / video / tlv320aic23b.c
1 /*
2  * tlv320aic23b - driver version 0.0.1
3  *
4  * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
5  *
6  * Based on wm8775 driver
7  *
8  * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
9  * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  */
25
26 #include <linux/module.h>
27 #include <linux/types.h>
28 #include <linux/ioctl.h>
29 #include <asm/uaccess.h>
30 #include <linux/i2c.h>
31 #include <linux/i2c-id.h>
32 #include <linux/videodev2.h>
33 #include <media/v4l2-common.h>
34 #include <media/v4l2-i2c-drv-legacy.h>
35
36 MODULE_DESCRIPTION("tlv320aic23b driver");
37 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
38 MODULE_LICENSE("GPL");
39
40 static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };
41
42 I2C_CLIENT_INSMOD;
43
44 /* ----------------------------------------------------------------------- */
45
46 struct tlv320aic23b_state {
47         u8 muted;
48 };
49
50 static int tlv320aic23b_write(struct i2c_client *client, int reg, u16 val)
51 {
52         int i;
53
54         if ((reg < 0 || reg > 9) && (reg != 15)) {
55                 v4l_err(client, "Invalid register R%d\n", reg);
56                 return -1;
57         }
58
59         for (i = 0; i < 3; i++)
60                 if (i2c_smbus_write_byte_data(client,
61                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
62                         return 0;
63         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
64         return -1;
65 }
66
67 static int tlv320aic23b_command(struct i2c_client *client,
68                                 unsigned int cmd, void *arg)
69 {
70         struct tlv320aic23b_state *state = i2c_get_clientdata(client);
71         struct v4l2_control *ctrl = arg;
72         u32 *freq = arg;
73
74         switch (cmd) {
75         case VIDIOC_INT_AUDIO_CLOCK_FREQ:
76                 switch (*freq) {
77                 case 32000: /* set sample rate to 32 kHz */
78                         tlv320aic23b_write(client, 8, 0x018);
79                         break;
80                 case 44100: /* set sample rate to 44.1 kHz */
81                         tlv320aic23b_write(client, 8, 0x022);
82                         break;
83                 case 48000: /* set sample rate to 48 kHz */
84                         tlv320aic23b_write(client, 8, 0x000);
85                         break;
86                 default:
87                         return -EINVAL;
88                 }
89                 break;
90
91         case VIDIOC_G_CTRL:
92                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
93                         return -EINVAL;
94                 ctrl->value = state->muted;
95                 break;
96
97         case VIDIOC_S_CTRL:
98                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
99                         return -EINVAL;
100                 state->muted = ctrl->value;
101                 tlv320aic23b_write(client, 0, 0x180); /* mute both channels */
102                 /* set gain on both channels to +3.0 dB */
103                 if (!state->muted)
104                         tlv320aic23b_write(client, 0, 0x119);
105                 break;
106
107         case VIDIOC_LOG_STATUS:
108                 v4l_info(client, "Input: %s\n",
109                             state->muted ? "muted" : "active");
110                 break;
111
112         default:
113                 return -EINVAL;
114         }
115         return 0;
116 }
117
118 /* ----------------------------------------------------------------------- */
119
120 /* i2c implementation */
121
122 /*
123  * Generic i2c probe
124  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
125  */
126
127 static int tlv320aic23b_probe(struct i2c_client *client,
128                               const struct i2c_device_id *id)
129 {
130         struct tlv320aic23b_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         v4l_info(client, "chip found @ 0x%x (%s)\n",
137                         client->addr << 1, client->adapter->name);
138
139         state = kmalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
140         if (state == NULL)
141                 return -ENOMEM;
142         state->muted = 0;
143         i2c_set_clientdata(client, state);
144
145         /* Initialize tlv320aic23b */
146
147         /* RESET */
148         tlv320aic23b_write(client, 15, 0x000);
149         /* turn off DAC & mic input */
150         tlv320aic23b_write(client, 6, 0x00A);
151         /* left-justified, 24-bit, master mode */
152         tlv320aic23b_write(client, 7, 0x049);
153         /* set gain on both channels to +3.0 dB */
154         tlv320aic23b_write(client, 0, 0x119);
155         /* set sample rate to 48 kHz */
156         tlv320aic23b_write(client, 8, 0x000);
157         /* activate digital interface */
158         tlv320aic23b_write(client, 9, 0x001);
159         return 0;
160 }
161
162 static int tlv320aic23b_remove(struct i2c_client *client)
163 {
164         kfree(i2c_get_clientdata(client));
165         return 0;
166 }
167
168 /* ----------------------------------------------------------------------- */
169
170 static const struct i2c_device_id tlv320aic23b_id[] = {
171         { "tlv320aic23b", 0 },
172         { }
173 };
174 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
175
176 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
177         .name = "tlv320aic23b",
178         .driverid = I2C_DRIVERID_TLV320AIC23B,
179         .command = tlv320aic23b_command,
180         .probe = tlv320aic23b_probe,
181         .remove = tlv320aic23b_remove,
182         .id_table = tlv320aic23b_id,
183 };