2 * wm8775 - driver version 0.0.1
4 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
6 * Based on saa7115 driver
8 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #include <linux/module.h>
29 #include <linux/types.h>
30 #include <linux/ioctl.h>
31 #include <asm/uaccess.h>
32 #include <linux/i2c.h>
33 #include <linux/i2c-id.h>
34 #include <linux/videodev.h>
35 #include <media/audiochip.h>
37 MODULE_DESCRIPTION("wm8775 driver");
38 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
39 MODULE_LICENSE("GPL");
41 #define wm8775_err(fmt, arg...) do { \
42 printk(KERN_ERR "%s %d-%04x: " fmt, client->driver->driver.name, \
43 i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)
44 #define wm8775_info(fmt, arg...) do { \
45 printk(KERN_INFO "%s %d-%04x: " fmt, client->driver->driver.name, \
46 i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)
49 static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };
54 /* ----------------------------------------------------------------------- */
58 R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
63 u8 input; /* Last selected input (0-0xf) */
67 static int wm8775_write(struct i2c_client *client, int reg, u16 val)
71 if (reg < 0 || reg >= TOT_REGS) {
72 wm8775_err("Invalid register R%d\n", reg);
76 for (i = 0; i < 3; i++) {
77 if (i2c_smbus_write_byte_data(client, (reg << 1) |
78 (val >> 8), val & 0xff) == 0) {
82 wm8775_err("I2C: cannot write %03x to register R%d\n", val, reg);
86 static int wm8775_command(struct i2c_client *client, unsigned int cmd,
89 struct wm8775_state *state = i2c_get_clientdata(client);
94 wm8775_write(client, R21, 0x0c0);
95 wm8775_write(client, R14, 0x1d4);
96 wm8775_write(client, R15, 0x1d4);
98 if (*input == AUDIO_RADIO) {
99 wm8775_write(client, R21, 0x108);
104 if (*input == AUDIO_MUTE) {
108 if (*input == AUDIO_UNMUTE) {
109 wm8775_write(client, R21, 0x100 + state->input);
113 /* All other inputs... */
114 wm8775_write(client, R21, 0x102);
119 case VIDIOC_LOG_STATUS:
120 wm8775_info("Input: %s%s\n",
121 state->input == 8 ? "radio" : "default",
122 state->muted ? " (muted)" : "");
125 case VIDIOC_S_FREQUENCY:
126 /* If I remove this, then it can happen that I have no
127 sound the first time I tune from static to a valid channel.
128 It's difficult to reproduce and is almost certainly related
129 to the zero cross detect circuit. */
130 wm8775_write(client, R21, 0x0c0);
131 wm8775_write(client, R14, 0x1d4);
132 wm8775_write(client, R15, 0x1d4);
133 wm8775_write(client, R21, 0x100 + state->input);
142 /* ----------------------------------------------------------------------- */
144 /* i2c implementation */
148 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
151 static struct i2c_driver i2c_driver;
153 static int wm8775_attach(struct i2c_adapter *adapter, int address, int kind)
155 struct i2c_client *client;
156 struct wm8775_state *state;
158 /* Check if the adapter supports the needed features */
159 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
162 client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
166 memset(client, 0, sizeof(struct i2c_client));
167 client->addr = address;
168 client->adapter = adapter;
169 client->driver = &i2c_driver;
170 snprintf(client->name, sizeof(client->name) - 1, "wm8775");
172 wm8775_info("chip found @ 0x%x (%s)\n", address << 1, adapter->name);
174 state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
181 i2c_set_clientdata(client, state);
183 /* initialize wm8775 */
184 wm8775_write(client, R23, 0x000); /* RESET */
185 wm8775_write(client, R7, 0x000); /* Disable zero cross detect timeout */
186 wm8775_write(client, R11, 0x021); /* Left justified, 24-bit mode */
187 wm8775_write(client, R12, 0x102); /* Master mode, clock ratio 256fs */
188 wm8775_write(client, R13, 0x000); /* Powered up */
189 wm8775_write(client, R14, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
190 wm8775_write(client, R15, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
191 wm8775_write(client, R16, 0x1bf); /* ALC Stereo, ALC target level -1dB FS */
193 wm8775_write(client, R17, 0x185); /* Enable gain control, use zero cross */
194 /* detection, ALC hold time 42.6 ms */
195 wm8775_write(client, R18, 0x0a2); /* ALC gain ramp up delay 34 s, */
196 /* ALC gain ramp down delay 33 ms */
197 wm8775_write(client, R19, 0x005); /* Enable noise gate, threshold -72dBfs */
198 wm8775_write(client, R20, 0x07a); /* Transient window 4ms, lower PGA gain */
200 wm8775_write(client, R21, 0x102); /* LRBOTH = 1, use input 2. */
201 i2c_attach_client(client);
206 static int wm8775_probe(struct i2c_adapter *adapter)
208 if (adapter->class & I2C_CLASS_TV_ANALOG)
209 return i2c_probe(adapter, &addr_data, wm8775_attach);
213 static int wm8775_detach(struct i2c_client *client)
217 err = i2c_detach_client(client);
226 /* ----------------------------------------------------------------------- */
228 /* i2c implementation */
229 static struct i2c_driver i2c_driver = {
234 .id = I2C_DRIVERID_WM8775,
236 .attach_adapter = wm8775_probe,
237 .detach_client = wm8775_detach,
238 .command = wm8775_command,
242 static int __init wm8775_init_module(void)
244 return i2c_add_driver(&i2c_driver);
247 static void __exit wm8775_cleanup_module(void)
249 i2c_del_driver(&i2c_driver);
252 module_init(wm8775_init_module);
253 module_exit(wm8775_cleanup_module);