V4L/DVB (6740): tlv320aic23b: codingstyle cleanups
[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/videodev.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
43 I2C_CLIENT_INSMOD;
44
45 /* ----------------------------------------------------------------------- */
46
47 struct tlv320aic23b_state {
48         u8 muted;
49 };
50
51 static int tlv320aic23b_write(struct i2c_client *client, int reg, u16 val)
52 {
53         int i;
54
55         if ((reg < 0 || reg > 9) && (reg != 15)) {
56                 v4l_err(client, "Invalid register R%d\n", reg);
57                 return -1;
58         }
59
60         for (i = 0; i < 3; i++)
61                 if (i2c_smbus_write_byte_data(client,
62                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
63                         return 0;
64         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
65         return -1;
66 }
67
68 static int tlv320aic23b_command(struct i2c_client *client,
69                                 unsigned int cmd, void *arg)
70 {
71         struct tlv320aic23b_state *state = i2c_get_clientdata(client);
72         struct v4l2_control *ctrl = arg;
73         u32 *freq = arg;
74
75         switch (cmd) {
76         case VIDIOC_INT_AUDIO_CLOCK_FREQ:
77                 switch (*freq) {
78                 case 32000: /* set sample rate to 32 kHz */
79                         tlv320aic23b_write(client, 8, 0x018);
80                         break;
81                 case 44100: /* set sample rate to 44.1 kHz */
82                         tlv320aic23b_write(client, 8, 0x022);
83                         break;
84                 case 48000: /* set sample rate to 48 kHz */
85                         tlv320aic23b_write(client, 8, 0x000);
86                         break;
87                 default:
88                         return -EINVAL;
89                 }
90                 break;
91
92         case VIDIOC_G_CTRL:
93                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
94                         return -EINVAL;
95                 ctrl->value = state->muted;
96                 break;
97
98         case VIDIOC_S_CTRL:
99                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
100                         return -EINVAL;
101                 state->muted = ctrl->value;
102                 tlv320aic23b_write(client, 0, 0x180); /* mute both channels */
103                 /* set gain on both channels to +3.0 dB */
104                 if (!state->muted)
105                         tlv320aic23b_write(client, 0, 0x119);
106                 break;
107
108         case VIDIOC_LOG_STATUS:
109                 v4l_info(client, "Input: %s\n",
110                             state->muted ? "muted" : "active");
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 tlv320aic23b_probe(struct i2c_client *client)
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
171 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
172         .name = "tlv320aic23b",
173         .driverid = I2C_DRIVERID_TLV320AIC23B,
174         .command = tlv320aic23b_command,
175         .probe = tlv320aic23b_probe,
176         .remove = tlv320aic23b_remove,
177 };