Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / drivers / media / video / tlv320aic23b.c
blob76b2e96429d90f22bb2d0ad6ad188a01a21023aa
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>
35 MODULE_DESCRIPTION("tlv320aic23b driver");
36 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
37 MODULE_LICENSE("GPL");
39 static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };
42 I2C_CLIENT_INSMOD;
44 /* ----------------------------------------------------------------------- */
46 struct tlv320aic23b_state {
47 u8 muted;
50 static int tlv320aic23b_write(struct i2c_client *client, int reg, u16 val)
52 int i;
54 if ((reg < 0 || reg > 9) && (reg != 15)) {
55 v4l_err(client, "Invalid register R%d\n", reg);
56 return -1;
59 for (i = 0; i < 3; i++) {
60 if (i2c_smbus_write_byte_data(client, (reg << 1) |
61 (val >> 8), val & 0xff) == 0) {
62 return 0;
65 v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
66 return -1;
69 static int tlv320aic23b_command(struct i2c_client *client, unsigned int cmd,
70 void *arg)
72 struct tlv320aic23b_state *state = i2c_get_clientdata(client);
73 struct v4l2_control *ctrl = arg;
74 u32* freq = arg;
76 switch (cmd) {
77 case VIDIOC_INT_AUDIO_CLOCK_FREQ:
78 switch (*freq) {
79 case 32000: /* set sample rate to 32 kHz */
80 tlv320aic23b_write(client, 8, 0x018);
81 break;
82 case 44100: /* set sample rate to 44.1 kHz */
83 tlv320aic23b_write(client, 8, 0x022);
84 break;
85 case 48000: /* set sample rate to 48 kHz */
86 tlv320aic23b_write(client, 8, 0x000);
87 break;
88 default:
89 return -EINVAL;
91 break;
93 case VIDIOC_G_CTRL:
94 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
95 return -EINVAL;
96 ctrl->value = state->muted;
97 break;
99 case VIDIOC_S_CTRL:
100 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
101 return -EINVAL;
102 state->muted = ctrl->value;
103 tlv320aic23b_write(client, 0, 0x180); /* mute both channels */
104 /* set gain on both channels to +3.0 dB */
105 if (!state->muted)
106 tlv320aic23b_write(client, 0, 0x119);
107 break;
109 case VIDIOC_LOG_STATUS:
110 v4l_info(client, "Input: %s\n",
111 state->muted ? "muted" : "active");
112 break;
114 default:
115 return -EINVAL;
117 return 0;
120 /* ----------------------------------------------------------------------- */
122 /* i2c implementation */
125 * Generic i2c probe
126 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
129 static struct i2c_driver i2c_driver;
131 static int tlv320aic23b_attach(struct i2c_adapter *adapter, int address, int kind)
133 struct i2c_client *client;
134 struct tlv320aic23b_state *state;
136 /* Check if the adapter supports the needed features */
137 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
138 return 0;
140 client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
141 if (client == 0)
142 return -ENOMEM;
144 client->addr = address;
145 client->adapter = adapter;
146 client->driver = &i2c_driver;
147 snprintf(client->name, sizeof(client->name) - 1, "tlv320aic23b");
149 v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
151 state = kmalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
152 if (state == NULL) {
153 kfree(client);
154 return -ENOMEM;
156 state->muted = 0;
157 i2c_set_clientdata(client, state);
159 /* initialize tlv320aic23b */
160 tlv320aic23b_write(client, 15, 0x000); /* RESET */
161 tlv320aic23b_write(client, 6, 0x00A); /* turn off DAC & mic input */
162 tlv320aic23b_write(client, 7, 0x049); /* left-justified, 24-bit, master mode */
163 tlv320aic23b_write(client, 0, 0x119); /* set gain on both channels to +3.0 dB */
164 tlv320aic23b_write(client, 8, 0x000); /* set sample rate to 48 kHz */
165 tlv320aic23b_write(client, 9, 0x001); /* activate digital interface */
167 i2c_attach_client(client);
169 return 0;
172 static int tlv320aic23b_probe(struct i2c_adapter *adapter)
174 if (adapter->class & I2C_CLASS_TV_ANALOG)
175 return i2c_probe(adapter, &addr_data, tlv320aic23b_attach);
176 return 0;
179 static int tlv320aic23b_detach(struct i2c_client *client)
181 int err;
183 err = i2c_detach_client(client);
184 if (err) {
185 return err;
187 kfree(client);
189 return 0;
192 /* ----------------------------------------------------------------------- */
194 /* i2c implementation */
195 static struct i2c_driver i2c_driver = {
196 .driver = {
197 .name = "tlv320aic23b",
199 .id = I2C_DRIVERID_TLV320AIC23B,
200 .attach_adapter = tlv320aic23b_probe,
201 .detach_client = tlv320aic23b_detach,
202 .command = tlv320aic23b_command,
206 static int __init tlv320aic23b_init_module(void)
208 return i2c_add_driver(&i2c_driver);
211 static void __exit tlv320aic23b_cleanup_module(void)
213 i2c_del_driver(&i2c_driver);
216 module_init(tlv320aic23b_init_module);
217 module_exit(tlv320aic23b_cleanup_module);