2 * wm8775 - driver version 0.0.1
4 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
6 * Based on saa7115 driver
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.
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.
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.
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/videodev.h>
30 #include <media/audiochip.h>
33 MODULE_DESCRIPTION("wm8775 driver");
34 MODULE_AUTHOR("Ulf Eklund");
35 MODULE_LICENSE("GPL");
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)
45 static unsigned short normal_i2c
[] = { 0x36 >> 1, I2C_CLIENT_END
};
50 /* ----------------------------------------------------------------------- */
54 R12
, R13
, R14
, R15
, R16
, R17
, R18
, R19
, R20
, R21
, R23
= 23,
59 u8 input
; /* Last selected input (0-0xf) */
63 static int wm8775_write(struct i2c_client
*client
, int reg
, u16 val
)
67 if (reg
< 0 || reg
>= TOT_REGS
) {
68 wm8775_err("Invalid register R%d\n", reg
);
72 for (i
= 0; i
< 3; i
++) {
73 if (i2c_smbus_write_byte_data(client
, (reg
<< 1) |
74 (val
>> 8), val
& 0xff) == 0) {
78 wm8775_err("I2C: cannot write %03x to register R%d\n", val
, reg
);
82 static int wm8775_command(struct i2c_client
*client
, unsigned int cmd
,
85 struct wm8775_state
*state
= i2c_get_clientdata(client
);
90 wm8775_write(client
, R21
, 0x0c0);
91 wm8775_write(client
, R14
, 0x1d4);
92 wm8775_write(client
, R15
, 0x1d4);
94 if (*input
== AUDIO_RADIO
) {
95 wm8775_write(client
, R21
, 0x108);
100 if (*input
== AUDIO_MUTE
) {
104 if (*input
== AUDIO_UNMUTE
) {
105 wm8775_write(client
, R21
, 0x100 + state
->input
);
109 /* All other inputs... */
110 wm8775_write(client
, R21
, 0x102);
117 /* If I remove this, then it can happen that I have no
118 sound the first time I tune from static to a valid channel.
119 It's difficult to reproduce and is almost certainly related
120 to the zero cross detect circuit. */
121 wm8775_write(client
, R21
, 0x0c0);
122 wm8775_write(client
, R14
, 0x1d4);
123 wm8775_write(client
, R15
, 0x1d4);
124 wm8775_write(client
, R21
, 0x100 + state
->input
);
133 /* ----------------------------------------------------------------------- */
135 /* i2c implementation */
139 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
142 static struct i2c_driver i2c_driver
;
144 static int wm8775_attach(struct i2c_adapter
*adapter
, int address
, int kind
)
146 struct i2c_client
*client
;
147 struct wm8775_state
*state
;
149 /* Check if the adapter supports the needed features */
150 if (!i2c_check_functionality(adapter
, I2C_FUNC_SMBUS_BYTE_DATA
))
153 client
= kmalloc(sizeof(struct i2c_client
), GFP_KERNEL
);
157 memset(client
, 0, sizeof(struct i2c_client
));
158 client
->addr
= address
;
159 client
->adapter
= adapter
;
160 client
->driver
= &i2c_driver
;
161 client
->flags
= I2C_CLIENT_ALLOW_USE
;
162 snprintf(client
->name
, sizeof(client
->name
) - 1, "wm8775");
164 wm8775_info("chip found @ 0x%x (%s)\n", address
<< 1, adapter
->name
);
166 state
= kmalloc(sizeof(struct wm8775_state
), GFP_KERNEL
);
173 i2c_set_clientdata(client
, state
);
175 /* initialize wm8775 */
176 wm8775_write(client
, R23
, 0x000); /* RESET */
177 wm8775_write(client
, R7
, 0x000); /* Disable zero cross detect timeout */
178 wm8775_write(client
, R11
, 0x021); /* Left justified, 24-bit mode */
179 wm8775_write(client
, R12
, 0x102); /* Master mode, clock ratio 256fs */
180 wm8775_write(client
, R13
, 0x000); /* Powered up */
181 wm8775_write(client
, R14
, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
182 wm8775_write(client
, R15
, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
183 wm8775_write(client
, R16
, 0x1bf); /* ALC Stereo, ALC target level -1dB FS */
185 wm8775_write(client
, R17
, 0x185); /* Enable gain control, use zero cross */
186 /* detection, ALC hold time 42.6 ms */
187 wm8775_write(client
, R18
, 0x0a2); /* ALC gain ramp up delay 34 s, */
188 /* ALC gain ramp down delay 33 ms */
189 wm8775_write(client
, R19
, 0x005); /* Enable noise gate, threshold -72dBfs */
190 wm8775_write(client
, R20
, 0x07a); /* Transient window 4ms, lower PGA gain */
192 wm8775_write(client
, R21
, 0x102); /* LRBOTH = 1, use input 2. */
193 i2c_attach_client(client
);
198 static int wm8775_probe(struct i2c_adapter
*adapter
)
200 #ifdef I2C_CLASS_TV_ANALOG
201 if (adapter
->class & I2C_CLASS_TV_ANALOG
)
202 return i2c_probe(adapter
, &addr_data
, wm8775_attach
);
204 switch (adapter
->id
) {
206 return i2c_probe(adapter
, &addr_data
, tda9887_attach
);
208 #endif /* I2C_CLASS_TV_ANALOG */
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
= {
232 .id
= I2C_DRIVERID_WM8775
,
233 .flags
= I2C_DF_NOTIFY
,
235 .attach_adapter
= wm8775_probe
,
236 .detach_client
= wm8775_detach
,
237 .command
= wm8775_command
,
238 .owner
= THIS_MODULE
,
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
);