Merge branch 'master'
[linux-2.6] / drivers / media / video / wm8775.c
1 /*
2  * wm8775 - driver version 0.0.1
3  *
4  * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
5  *
6  * Based on saa7115 driver
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22
23
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/ioctl.h>
27 #include <asm/uaccess.h>
28 #include <linux/i2c.h>
29 #include <linux/i2c-id.h>
30 #include <linux/videodev.h>
31 #include <media/audiochip.h>
32
33 MODULE_DESCRIPTION("wm8775 driver");
34 MODULE_AUTHOR("Ulf Eklund");
35 MODULE_LICENSE("GPL");
36
37 #define wm8775_err(fmt, arg...) do { \
38         printk(KERN_ERR "%s %d-%04x: " fmt, client->driver->name, \
39                i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)
40 #define wm8775_info(fmt, arg...) do { \
41         printk(KERN_INFO "%s %d-%04x: " fmt, client->driver->name, \
42                i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)
43
44
45 static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };
46
47
48 I2C_CLIENT_INSMOD;
49
50 /* ----------------------------------------------------------------------- */
51
52 enum {
53         R7 = 7, R11 = 11,
54         R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
55         TOT_REGS
56 };
57
58 struct wm8775_state {
59         u8 input;               /* Last selected input (0-0xf) */
60         u8 muted;
61 };
62
63 static int wm8775_write(struct i2c_client *client, int reg, u16 val)
64 {
65         int i;
66
67         if (reg < 0 || reg >= TOT_REGS) {
68                 wm8775_err("Invalid register R%d\n", reg);
69                 return -1;
70         }
71
72         for (i = 0; i < 3; i++) {
73                 if (i2c_smbus_write_byte_data(client, (reg << 1) |
74                                         (val >> 8), val & 0xff) == 0) {
75                         return 0;
76                 }
77         }
78         wm8775_err("I2C: cannot write %03x to register R%d\n", val, reg);
79         return -1;
80 }
81
82 static int wm8775_command(struct i2c_client *client, unsigned int cmd,
83                           void *arg)
84 {
85         struct wm8775_state *state = i2c_get_clientdata(client);
86         int *input = arg;
87
88         switch (cmd) {
89         case AUDC_SET_INPUT:
90                 wm8775_write(client, R21, 0x0c0);
91                 wm8775_write(client, R14, 0x1d4);
92                 wm8775_write(client, R15, 0x1d4);
93
94                 if (*input == AUDIO_RADIO) {
95                         wm8775_write(client, R21, 0x108);
96                         state->input = 8;
97                         state->muted = 0;
98                         break;
99                 }
100                 if (*input == AUDIO_MUTE) {
101                         state->muted = 1;
102                         break;
103                 }
104                 if (*input == AUDIO_UNMUTE) {
105                         wm8775_write(client, R21, 0x100 + state->input);
106                         state->muted = 0;
107                         break;
108                 }
109                 /* All other inputs... */
110                 wm8775_write(client, R21, 0x102);
111                 state->input = 2;
112                 state->muted = 0;
113                 break;
114
115         case VIDIOC_LOG_STATUS:
116                 wm8775_info("Input: %s%s\n",
117                             state->input == 8 ? "radio" : "default",
118                             state->muted ? " (muted)" : "");
119                 break;
120
121         case VIDIOC_S_FREQUENCY:
122                 /* If I remove this, then it can happen that I have no
123                    sound the first time I tune from static to a valid channel.
124                    It's difficult to reproduce and is almost certainly related
125                    to the zero cross detect circuit. */
126                 wm8775_write(client, R21, 0x0c0);
127                 wm8775_write(client, R14, 0x1d4);
128                 wm8775_write(client, R15, 0x1d4);
129                 wm8775_write(client, R21, 0x100 + state->input);
130                 break;
131
132         default:
133                 return -EINVAL;
134         }
135         return 0;
136 }
137
138 /* ----------------------------------------------------------------------- */
139
140 /* i2c implementation */
141
142 /*
143  * Generic i2c probe
144  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
145  */
146
147 static struct i2c_driver i2c_driver;
148
149 static int wm8775_attach(struct i2c_adapter *adapter, int address, int kind)
150 {
151         struct i2c_client *client;
152         struct wm8775_state *state;
153
154         /* Check if the adapter supports the needed features */
155         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
156                 return 0;
157
158         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
159         if (client == 0)
160                 return -ENOMEM;
161
162         memset(client, 0, sizeof(struct i2c_client));
163         client->addr = address;
164         client->adapter = adapter;
165         client->driver = &i2c_driver;
166         client->flags = I2C_CLIENT_ALLOW_USE;
167         snprintf(client->name, sizeof(client->name) - 1, "wm8775");
168
169         wm8775_info("chip found @ 0x%x (%s)\n", address << 1, adapter->name);
170
171         state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
172         if (state == NULL) {
173                 kfree(client);
174                 return -ENOMEM;
175         }
176         state->input = 2;
177         state->muted = 0;
178         i2c_set_clientdata(client, state);
179
180         /* initialize wm8775 */
181         wm8775_write(client, R23, 0x000);       /* RESET */
182         wm8775_write(client, R7, 0x000);        /* Disable zero cross detect timeout */
183         wm8775_write(client, R11, 0x021);       /* Left justified, 24-bit mode */
184         wm8775_write(client, R12, 0x102);       /* Master mode, clock ratio 256fs */
185         wm8775_write(client, R13, 0x000);       /* Powered up */
186         wm8775_write(client, R14, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
187         wm8775_write(client, R15, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
188         wm8775_write(client, R16, 0x1bf);       /* ALC Stereo, ALC target level -1dB FS */
189         /* max gain +8dB */
190         wm8775_write(client, R17, 0x185);       /* Enable gain control, use zero cross */
191         /* detection, ALC hold time 42.6 ms */
192         wm8775_write(client, R18, 0x0a2);       /* ALC gain ramp up delay 34 s, */
193         /* ALC gain ramp down delay 33 ms */
194         wm8775_write(client, R19, 0x005);       /* Enable noise gate, threshold -72dBfs */
195         wm8775_write(client, R20, 0x07a);       /* Transient window 4ms, lower PGA gain */
196         /* limit -1dB */
197         wm8775_write(client, R21, 0x102);       /* LRBOTH = 1, use input 2. */
198         i2c_attach_client(client);
199
200         return 0;
201 }
202
203 static int wm8775_probe(struct i2c_adapter *adapter)
204 {
205 #ifdef I2C_CLASS_TV_ANALOG
206         if (adapter->class & I2C_CLASS_TV_ANALOG)
207 #else
208         if (adapter->id == I2C_HW_B_BT848)
209 #endif
210                 return i2c_probe(adapter, &addr_data, wm8775_attach);
211         return 0;
212 }
213
214 static int wm8775_detach(struct i2c_client *client)
215 {
216         int err;
217
218         err = i2c_detach_client(client);
219         if (err) {
220                 return err;
221         }
222         kfree(client);
223
224         return 0;
225 }
226
227 /* ----------------------------------------------------------------------- */
228
229 /* i2c implementation */
230 static struct i2c_driver i2c_driver = {
231         .name = "wm8775",
232
233         .id = I2C_DRIVERID_WM8775,
234         .flags = I2C_DF_NOTIFY,
235
236         .attach_adapter = wm8775_probe,
237         .detach_client = wm8775_detach,
238         .command = wm8775_command,
239         .owner = THIS_MODULE,
240 };
241
242
243 static int __init wm8775_init_module(void)
244 {
245         return i2c_add_driver(&i2c_driver);
246 }
247
248 static void __exit wm8775_cleanup_module(void)
249 {
250         i2c_del_driver(&i2c_driver);
251 }
252
253 module_init(wm8775_init_module);
254 module_exit(wm8775_cleanup_module);