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/v4l2-common.h>
37 MODULE_DESCRIPTION("wm8775 driver");
38 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
39 MODULE_LICENSE("GPL");
41 static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };
46 /* ----------------------------------------------------------------------- */
50 R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
55 u8 input; /* Last selected input (0-0xf) */
59 static int wm8775_write(struct i2c_client *client, int reg, u16 val)
63 if (reg < 0 || reg >= TOT_REGS) {
64 v4l_err(client, "Invalid register R%d\n", reg);
68 for (i = 0; i < 3; i++) {
69 if (i2c_smbus_write_byte_data(client, (reg << 1) |
70 (val >> 8), val & 0xff) == 0) {
74 v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
78 static int wm8775_command(struct i2c_client *client, unsigned int cmd,
81 struct wm8775_state *state = i2c_get_clientdata(client);
82 struct v4l2_audio *input = arg;
83 struct v4l2_control *ctrl = arg;
87 /* There are 4 inputs and one output. Zero or more inputs
88 are multiplexed together to the output. Hence there are
90 If only one input is active (the normal case) then the
91 input values 1, 2, 4 or 8 should be used. */
92 if (input->index > 15) {
93 v4l_err(client, "Invalid input %d.\n", input->index);
96 state->input = input->index;
99 wm8775_write(client, R21, 0x0c0);
100 wm8775_write(client, R14, 0x1d4);
101 wm8775_write(client, R15, 0x1d4);
102 wm8775_write(client, R21, 0x100 + state->input);
106 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
108 ctrl->value = state->muted;
112 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
114 state->muted = ctrl->value;
115 wm8775_write(client, R21, 0x0c0);
116 wm8775_write(client, R14, 0x1d4);
117 wm8775_write(client, R15, 0x1d4);
119 wm8775_write(client, R21, 0x100 + state->input);
122 case VIDIOC_LOG_STATUS:
123 v4l_info(client, "Input: %d%s\n", state->input,
124 state->muted ? " (muted)" : "");
127 case VIDIOC_S_FREQUENCY:
128 /* If I remove this, then it can happen that I have no
129 sound the first time I tune from static to a valid channel.
130 It's difficult to reproduce and is almost certainly related
131 to the zero cross detect circuit. */
132 wm8775_write(client, R21, 0x0c0);
133 wm8775_write(client, R14, 0x1d4);
134 wm8775_write(client, R15, 0x1d4);
135 wm8775_write(client, R21, 0x100 + state->input);
144 /* ----------------------------------------------------------------------- */
146 /* i2c implementation */
150 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
153 static struct i2c_driver i2c_driver;
155 static int wm8775_attach(struct i2c_adapter *adapter, int address, int kind)
157 struct i2c_client *client;
158 struct wm8775_state *state;
160 /* Check if the adapter supports the needed features */
161 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
164 client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
168 client->addr = address;
169 client->adapter = adapter;
170 client->driver = &i2c_driver;
171 snprintf(client->name, sizeof(client->name) - 1, "wm8775");
173 v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
175 state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
182 i2c_set_clientdata(client, state);
184 /* initialize wm8775 */
185 wm8775_write(client, R23, 0x000); /* RESET */
186 wm8775_write(client, R7, 0x000); /* Disable zero cross detect timeout */
187 wm8775_write(client, R11, 0x021); /* Left justified, 24-bit mode */
188 wm8775_write(client, R12, 0x102); /* Master mode, clock ratio 256fs */
189 wm8775_write(client, R13, 0x000); /* Powered up */
190 wm8775_write(client, R14, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
191 wm8775_write(client, R15, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
192 wm8775_write(client, R16, 0x1bf); /* ALC Stereo, ALC target level -1dB FS */
194 wm8775_write(client, R17, 0x185); /* Enable gain control, use zero cross */
195 /* detection, ALC hold time 42.6 ms */
196 wm8775_write(client, R18, 0x0a2); /* ALC gain ramp up delay 34 s, */
197 /* ALC gain ramp down delay 33 ms */
198 wm8775_write(client, R19, 0x005); /* Enable noise gate, threshold -72dBfs */
199 wm8775_write(client, R20, 0x07a); /* Transient window 4ms, lower PGA gain */
201 wm8775_write(client, R21, 0x102); /* LRBOTH = 1, use input 2. */
202 i2c_attach_client(client);
207 static int wm8775_probe(struct i2c_adapter *adapter)
209 if (adapter->class & I2C_CLASS_TV_ANALOG)
210 return i2c_probe(adapter, &addr_data, wm8775_attach);
214 static int wm8775_detach(struct i2c_client *client)
218 err = i2c_detach_client(client);
227 /* ----------------------------------------------------------------------- */
229 /* i2c implementation */
230 static struct i2c_driver i2c_driver = {
234 .id = I2C_DRIVERID_WM8775,
235 .attach_adapter = wm8775_probe,
236 .detach_client = wm8775_detach,
237 .command = wm8775_command,
241 static int __init wm8775_init_module(void)
243 return i2c_add_driver(&i2c_driver);
246 static void __exit wm8775_cleanup_module(void)
248 i2c_del_driver(&i2c_driver);
251 module_init(wm8775_init_module);
252 module_exit(wm8775_cleanup_module);