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);
90 struct v4l2_audio *input = arg;
91 struct v4l2_control *ctrl = arg;
95 /* There are 4 inputs and one output. Zero or more inputs
96 are multiplexed together to the output. Hence there are
98 If only one input is active (the normal case) then the
99 input values 1, 2, 4 or 8 should be used. */
100 if (input->index > 15) {
101 wm8775_err("Invalid input %d.\n", input->index);
104 state->input = input->index;
107 wm8775_write(client, R21, 0x0c0);
108 wm8775_write(client, R14, 0x1d4);
109 wm8775_write(client, R15, 0x1d4);
110 wm8775_write(client, R21, 0x100 + state->input);
114 memset(input, 0, sizeof(*input));
115 input->index = state->input;
119 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
121 ctrl->value = state->muted;
125 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
127 state->muted = ctrl->value;
128 wm8775_write(client, R21, 0x0c0);
129 wm8775_write(client, R14, 0x1d4);
130 wm8775_write(client, R15, 0x1d4);
132 wm8775_write(client, R21, 0x100 + state->input);
135 case VIDIOC_LOG_STATUS:
136 wm8775_info("Input: %d%s\n", state->input,
137 state->muted ? " (muted)" : "");
140 case VIDIOC_S_FREQUENCY:
141 /* If I remove this, then it can happen that I have no
142 sound the first time I tune from static to a valid channel.
143 It's difficult to reproduce and is almost certainly related
144 to the zero cross detect circuit. */
145 wm8775_write(client, R21, 0x0c0);
146 wm8775_write(client, R14, 0x1d4);
147 wm8775_write(client, R15, 0x1d4);
148 wm8775_write(client, R21, 0x100 + state->input);
157 /* ----------------------------------------------------------------------- */
159 /* i2c implementation */
163 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
166 static struct i2c_driver i2c_driver;
168 static int wm8775_attach(struct i2c_adapter *adapter, int address, int kind)
170 struct i2c_client *client;
171 struct wm8775_state *state;
173 /* Check if the adapter supports the needed features */
174 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
177 client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
181 memset(client, 0, sizeof(struct i2c_client));
182 client->addr = address;
183 client->adapter = adapter;
184 client->driver = &i2c_driver;
185 snprintf(client->name, sizeof(client->name) - 1, "wm8775");
187 wm8775_info("chip found @ 0x%x (%s)\n", address << 1, adapter->name);
189 state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
196 i2c_set_clientdata(client, state);
198 /* initialize wm8775 */
199 wm8775_write(client, R23, 0x000); /* RESET */
200 wm8775_write(client, R7, 0x000); /* Disable zero cross detect timeout */
201 wm8775_write(client, R11, 0x021); /* Left justified, 24-bit mode */
202 wm8775_write(client, R12, 0x102); /* Master mode, clock ratio 256fs */
203 wm8775_write(client, R13, 0x000); /* Powered up */
204 wm8775_write(client, R14, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
205 wm8775_write(client, R15, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
206 wm8775_write(client, R16, 0x1bf); /* ALC Stereo, ALC target level -1dB FS */
208 wm8775_write(client, R17, 0x185); /* Enable gain control, use zero cross */
209 /* detection, ALC hold time 42.6 ms */
210 wm8775_write(client, R18, 0x0a2); /* ALC gain ramp up delay 34 s, */
211 /* ALC gain ramp down delay 33 ms */
212 wm8775_write(client, R19, 0x005); /* Enable noise gate, threshold -72dBfs */
213 wm8775_write(client, R20, 0x07a); /* Transient window 4ms, lower PGA gain */
215 wm8775_write(client, R21, 0x102); /* LRBOTH = 1, use input 2. */
216 i2c_attach_client(client);
221 static int wm8775_probe(struct i2c_adapter *adapter)
223 if (adapter->class & I2C_CLASS_TV_ANALOG)
224 return i2c_probe(adapter, &addr_data, wm8775_attach);
228 static int wm8775_detach(struct i2c_client *client)
232 err = i2c_detach_client(client);
241 /* ----------------------------------------------------------------------- */
243 /* i2c implementation */
244 static struct i2c_driver i2c_driver = {
249 .id = I2C_DRIVERID_WM8775,
251 .attach_adapter = wm8775_probe,
252 .detach_client = wm8775_detach,
253 .command = wm8775_command,
257 static int __init wm8775_init_module(void)
259 return i2c_add_driver(&i2c_driver);
262 static void __exit wm8775_cleanup_module(void)
264 i2c_del_driver(&i2c_driver);
267 module_init(wm8775_init_module);
268 module_exit(wm8775_cleanup_module);