V4L/DVB (6715): ivtv: Remove unnecessary register update
[linux-2.6/verdex.git] / drivers / media / video / tlv320aic23b.c
blobe906528348a9a276149f3eb9509cf8b236de8f2e
1 /*
2 * tlv320aic23b - driver version 0.0.1
4 * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
6 * Based on wm8775 driver
8 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
9 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
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.
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.
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.
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>
36 MODULE_DESCRIPTION("tlv320aic23b driver");
37 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
38 MODULE_LICENSE("GPL");
40 static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };
43 I2C_CLIENT_INSMOD;
45 /* ----------------------------------------------------------------------- */
47 struct tlv320aic23b_state {
48 u8 muted;
51 static int tlv320aic23b_write(struct i2c_client *client, int reg, u16 val)
53 int i;
55 if ((reg < 0 || reg > 9) && (reg != 15)) {
56 v4l_err(client, "Invalid register R%d\n", reg);
57 return -1;
60 for (i = 0; i < 3; i++) {
61 if (i2c_smbus_write_byte_data(client, (reg << 1) |
62 (val >> 8), val & 0xff) == 0) {
63 return 0;
66 v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
67 return -1;
70 static int tlv320aic23b_command(struct i2c_client *client, unsigned int cmd,
71 void *arg)
73 struct tlv320aic23b_state *state = i2c_get_clientdata(client);
74 struct v4l2_control *ctrl = arg;
75 u32* freq = arg;
77 switch (cmd) {
78 case VIDIOC_INT_AUDIO_CLOCK_FREQ:
79 switch (*freq) {
80 case 32000: /* set sample rate to 32 kHz */
81 tlv320aic23b_write(client, 8, 0x018);
82 break;
83 case 44100: /* set sample rate to 44.1 kHz */
84 tlv320aic23b_write(client, 8, 0x022);
85 break;
86 case 48000: /* set sample rate to 48 kHz */
87 tlv320aic23b_write(client, 8, 0x000);
88 break;
89 default:
90 return -EINVAL;
92 break;
94 case VIDIOC_G_CTRL:
95 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
96 return -EINVAL;
97 ctrl->value = state->muted;
98 break;
100 case VIDIOC_S_CTRL:
101 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
102 return -EINVAL;
103 state->muted = ctrl->value;
104 tlv320aic23b_write(client, 0, 0x180); /* mute both channels */
105 /* set gain on both channels to +3.0 dB */
106 if (!state->muted)
107 tlv320aic23b_write(client, 0, 0x119);
108 break;
110 case VIDIOC_LOG_STATUS:
111 v4l_info(client, "Input: %s\n",
112 state->muted ? "muted" : "active");
113 break;
115 default:
116 return -EINVAL;
118 return 0;
121 /* ----------------------------------------------------------------------- */
123 /* i2c implementation */
126 * Generic i2c probe
127 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
130 static int tlv320aic23b_probe(struct i2c_client *client)
132 struct tlv320aic23b_state *state;
134 /* Check if the adapter supports the needed features */
135 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
136 return -EIO;
138 v4l_info(client, "chip found @ 0x%x (%s)\n", client->addr << 1, client->adapter->name);
140 state = kmalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
141 if (state == NULL) {
142 return -ENOMEM;
144 state->muted = 0;
145 i2c_set_clientdata(client, state);
147 /* initialize tlv320aic23b */
148 tlv320aic23b_write(client, 15, 0x000); /* RESET */
149 tlv320aic23b_write(client, 6, 0x00A); /* turn off DAC & mic input */
150 tlv320aic23b_write(client, 7, 0x049); /* left-justified, 24-bit, master mode */
151 tlv320aic23b_write(client, 0, 0x119); /* set gain on both channels to +3.0 dB */
152 tlv320aic23b_write(client, 8, 0x000); /* set sample rate to 48 kHz */
153 tlv320aic23b_write(client, 9, 0x001); /* activate digital interface */
154 return 0;
157 static int tlv320aic23b_remove(struct i2c_client *client)
159 kfree(i2c_get_clientdata(client));
160 return 0;
163 /* ----------------------------------------------------------------------- */
166 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
167 .name = "tlv320aic23b",
168 .driverid = I2C_DRIVERID_TLV320AIC23B,
169 .command = tlv320aic23b_command,
170 .probe = tlv320aic23b_probe,
171 .remove = tlv320aic23b_remove,