tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
36MODULE_DESCRIPTION("tlv320aic23b driver");
37MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
38MODULE_LICENSE("GPL");
39
40static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };
41
42
43I2C_CLIENT_INSMOD;
44
45/* ----------------------------------------------------------------------- */
46
47struct tlv320aic23b_state {
48 u8 muted;
49};
50
51static 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
68static 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
128static 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
162static int tlv320aic23b_remove(struct i2c_client *client)
163{
164 kfree(i2c_get_clientdata(client));
165 return 0;
166}
167
168/* ----------------------------------------------------------------------- */
169
170
171static 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};