aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/wm8775.c
blob: a6936ad74fcf49073bc635aba17c84dd09dd262a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
/*
 * wm8775 - driver version 0.0.1
 *
 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
 *
 * Based on saa7115 driver
 *
 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
 * - Cleanup
 * - V4L2 API update
 * - sound fixes
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include <linux/module.h>
#include <linux/types.h>
#include <linux/ioctl.h>
#include <asm/uaccess.h>
#include <linux/i2c.h>
#include <linux/i2c-id.h>
#include <linux/videodev.h>
#include <media/audiochip.h>

MODULE_DESCRIPTION("wm8775 driver");
MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
MODULE_LICENSE("GPL");

#define wm8775_err(fmt, arg...) do { \
	printk(KERN_ERR "%s %d-%04x: " fmt, client->driver->name, \
	       i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)
#define wm8775_info(fmt, arg...) do { \
	printk(KERN_INFO "%s %d-%04x: " fmt, client->driver->name, \
	       i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)


static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };


I2C_CLIENT_INSMOD;

/* ----------------------------------------------------------------------- */

enum {
	R7 = 7, R11 = 11,
	R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
	TOT_REGS
};

struct wm8775_state {
	u8 input;		/* Last selected input (0-0xf) */
	u8 muted;
};

static int wm8775_write(struct i2c_client *client, int reg, u16 val)
{
	int i;

	if (reg < 0 || reg >= TOT_REGS) {
		wm8775_err("Invalid register R%d\n", reg);
		return -1;
	}

	for (i = 0; i < 3; i++) {
		if (i2c_smbus_write_byte_data(client, (reg << 1) |
					(val >> 8), val & 0xff) == 0) {
			return 0;
		}
	}
	wm8775_err("I2C: cannot write %03x to register R%d\n", val, reg);
	return -1;
}

static int wm8775_command(struct i2c_client *client, unsigned int cmd,
			  void *arg)
{
	struct wm8775_state *state = i2c_get_clientdata(client);
	int *input = arg;

	switch (cmd) {
	case AUDC_SET_INPUT:
		wm8775_write(client, R21, 0x0c0);
		wm8775_write(client, R14, 0x1d4);
		wm8775_write(client, R15, 0x1d4);

		if (*input == AUDIO_RADIO) {
			wm8775_write(client, R21, 0x108);
			state->input = 8;
			state->muted = 0;
			break;
		}
		if (*input == AUDIO_MUTE) {
			state->muted = 1;
			break;
		}
		if (*input == AUDIO_UNMUTE) {
			wm8775_write(client, R21, 0x100 + state->input);
			state->muted = 0;
			break;
		}
		/* All other inputs... */
		wm8775_write(client, R21, 0x102);
		state->input = 2;
		state->muted = 0;
		break;

	case VIDIOC_LOG_STATUS:
		wm8775_info("Input: %s%s\n",
			    state->input == 8 ? "radio" : "default",
			    state->muted ? " (muted)" : "");
		break;

	case VIDIOC_S_FREQUENCY:
		/* If I remove this, then it can happen that I have no
		   sound the first time I tune from static to a valid channel.
		   It's difficult to reproduce and is almost certainly related
		   to the zero cross detect circuit. */
		wm8775_write(client, R21, 0x0c0);
		wm8775_write(client, R14, 0x1d4);
		wm8775_write(client, R15, 0x1d4);
		wm8775_write(client, R21, 0x100 + state->input);
		break;

	default:
		return -EINVAL;
	}
	return 0;
}

/* ----------------------------------------------------------------------- */

/* i2c implementation */

/*
 * Generic i2c probe
 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 */

static struct i2c_driver i2c_driver;

static int wm8775_attach(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *client;
	struct wm8775_state *state;

	/* Check if the adapter supports the needed features */
	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return 0;

	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
	if (client == 0)
		return -ENOMEM;

	memset(client, 0, sizeof(struct i2c_client));
	client->addr = address;
	client->adapter = adapter;
	client->driver = &i2c_driver;
	client->flags = I2C_CLIENT_ALLOW_USE;
	snprintf(client->name, sizeof(client->name) - 1, "wm8775");

	wm8775_info("chip found @ 0x%x (%s)\n", address << 1, adapter->name);

	state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
	if (state == NULL) {
		kfree(client);
		return -ENOMEM;
	}
	state->input = 2;
	state->muted = 0;
	i2c_set_clientdata(client, state);

	/* initialize wm8775 */
	wm8775_write(client, R23, 0x000);	/* RESET */
	wm8775_write(client, R7, 0x000);	/* Disable zero cross detect timeout */
	wm8775_write(client, R11, 0x021);	/* Left justified, 24-bit mode */
	wm8775_write(client, R12, 0x102);	/* Master mode, clock ratio 256fs */
	wm8775_write(client, R13, 0x000);	/* Powered up */
	wm8775_write(client, R14, 0x1d4);	/* ADC gain +2.5dB, enable zero cross */
	wm8775_write(client, R15, 0x1d4);	/* ADC gain +2.5dB, enable zero cross */
	wm8775_write(client, R16, 0x1bf);	/* ALC Stereo, ALC target level -1dB FS */
	/* max gain +8dB */
	wm8775_write(client, R17, 0x185);	/* Enable gain control, use zero cross */
	/* detection, ALC hold time 42.6 ms */
	wm8775_write(client, R18, 0x0a2);	/* ALC gain ramp up delay 34 s, */
	/* ALC gain ramp down delay 33 ms */
	wm8775_write(client, R19, 0x005);	/* Enable noise gate, threshold -72dBfs */
	wm8775_write(client, R20, 0x07a);	/* Transient window 4ms, lower PGA gain */
	/* limit -1dB */
	wm8775_write(client, R21, 0x102);	/* LRBOTH = 1, use input 2. */
	i2c_attach_client(client);

	return 0;
}

static int wm8775_probe(struct i2c_adapter *adapter)
{
#ifdef I2C_CLASS_TV_ANALOG
	if (adapter->class & I2C_CLASS_TV_ANALOG)
#else
	if (adapter->id == I2C_HW_B_BT848)
#endif
		return i2c_probe(adapter, &addr_data, wm8775_attach);
	return 0;
}

static int wm8775_detach(struct i2c_client *client)
{
	int err;

	err = i2c_detach_client(client);
	if (err) {
		return err;
	}
	kfree(client);

	return 0;
}

/* ----------------------------------------------------------------------- */

/* i2c implementation */
static struct i2c_driver i2c_driver = {
	.name = "wm8775",

	.id = I2C_DRIVERID_WM8775,
	.flags = I2C_DF_NOTIFY,

	.attach_adapter = wm8775_probe,
	.detach_client = wm8775_detach,
	.command = wm8775_command,
	.owner = THIS_MODULE,
};


static int __init wm8775_init_module(void)
{
	return i2c_add_driver(&i2c_driver);
}

static void __exit wm8775_cleanup_module(void)
{
	i2c_del_driver(&i2c_driver);
}

module_init(wm8775_init_module);
module_exit(wm8775_cleanup_module);