V4L/DVB (4638): Basic DVB-T and analog TV support for the HVR1300.
[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
35 MODULE_DESCRIPTION("tlv320aic23b driver");
36 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
37 MODULE_LICENSE("GPL");
38
39 static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };
40
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, (reg << 1) |
61                                         (val >> 8), val & 0xff) == 0) {
62                         return 0;
63                 }
64         }
65         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
66         return -1;
67 }
68
69 static int tlv320aic23b_command(struct i2c_client *client, unsigned int cmd,
70                           void *arg)
71 {
72         struct tlv320aic23b_state *state = i2c_get_clientdata(client);
73         struct v4l2_control *ctrl = arg;
74         u32* freq = arg;
75
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;
90                 }
91                 break;
92
93         case VIDIOC_G_CTRL:
94                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
95                         return -EINVAL;
96                 ctrl->value = state->muted;
97                 break;
98
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;
108
109         case VIDIOC_LOG_STATUS:
110                 v4l_info(client, "Input: %s\n",
111                             state->muted ? "muted" : "active");
112                 break;
113
114         default:
115                 return -EINVAL;
116         }
117         return 0;
118 }
119
120 /* ----------------------------------------------------------------------- */
121
122 /* i2c implementation */
123
124 /*
125  * Generic i2c probe
126  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
127  */
128
129 static struct i2c_driver i2c_driver;
130
131 static int tlv320aic23b_attach(struct i2c_adapter *adapter, int address, int kind)
132 {
133         struct i2c_client *client;
134         struct tlv320aic23b_state *state;
135
136         /* Check if the adapter supports the needed features */
137         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
138                 return 0;
139
140         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
141         if (client == 0)
142                 return -ENOMEM;
143
144         client->addr = address;
145         client->adapter = adapter;
146         client->driver = &i2c_driver;
147         snprintf(client->name, sizeof(client->name) - 1, "tlv320aic23b");
148
149         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
150
151         state = kmalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
152         if (state == NULL) {
153                 kfree(client);
154                 return -ENOMEM;
155         }
156         state->muted = 0;
157         i2c_set_clientdata(client, state);
158
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 */
166
167         i2c_attach_client(client);
168
169         return 0;
170 }
171
172 static int tlv320aic23b_probe(struct i2c_adapter *adapter)
173 {
174         if (adapter->class & I2C_CLASS_TV_ANALOG)
175                 return i2c_probe(adapter, &addr_data, tlv320aic23b_attach);
176         return 0;
177 }
178
179 static int tlv320aic23b_detach(struct i2c_client *client)
180 {
181         int err;
182
183         err = i2c_detach_client(client);
184         if (err) {
185                 return err;
186         }
187         kfree(client);
188
189         return 0;
190 }
191
192 /* ----------------------------------------------------------------------- */
193
194 /* i2c implementation */
195 static struct i2c_driver i2c_driver = {
196         .driver = {
197                 .name = "tlv320aic23b",
198         },
199         .id             = I2C_DRIVERID_TLV320AIC23B,
200         .attach_adapter = tlv320aic23b_probe,
201         .detach_client  = tlv320aic23b_detach,
202         .command        = tlv320aic23b_command,
203 };
204
205
206 static int __init tlv320aic23b_init_module(void)
207 {
208         return i2c_add_driver(&i2c_driver);
209 }
210
211 static void __exit tlv320aic23b_cleanup_module(void)
212 {
213         i2c_del_driver(&i2c_driver);
214 }
215
216 module_init(tlv320aic23b_init_module);
217 module_exit(tlv320aic23b_cleanup_module);