aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/cs53l32a.c
blob: de87247c74ee95138b78fa9f7d1eabd62700b8d3 (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
/*
 * cs53l32a (Adaptec AVC-2010 and AVC-2410) i2c ivtv driver.
 * Copyright (C) 2005  Martin Vaughan
 *
 * Audio source switching for Adaptec AVC-2410 added by Trev Jackson
 *
 * 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/v4l2-common.h>

MODULE_DESCRIPTION("i2c device driver for cs53l32a Audio ADC");
MODULE_AUTHOR("Martin Vaughan");
MODULE_LICENSE("GPL");

static int debug = 0;

module_param(debug, bool, 0644);

MODULE_PARM_DESC(debug, "Debugging messages\n\t\t\t0=Off (default), 1=On");

static unsigned short normal_i2c[] = { 0x22 >> 1, I2C_CLIENT_END };


I2C_CLIENT_INSMOD;

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

static int cs53l32a_write(struct i2c_client *client, u8 reg, u8 value)
{
	return i2c_smbus_write_byte_data(client, reg, value);
}

static int cs53l32a_read(struct i2c_client *client, u8 reg)
{
	return i2c_smbus_read_byte_data(client, reg);
}

static int cs53l32a_command(struct i2c_client *client, unsigned int cmd,
			    void *arg)
{
	struct v4l2_routing *route = arg;
	struct v4l2_control *ctrl = arg;

	switch (cmd) {
	case VIDIOC_INT_G_AUDIO_ROUTING:
		route->input = (cs53l32a_read(client, 0x01) >> 4) & 3;
		route->output = 0;
		break;

	case VIDIOC_INT_S_AUDIO_ROUTING:
		/* There are 2 physical inputs, but the second input can be
		   placed in two modes, the first mode bypasses the PGA (gain),
		   the second goes through the PGA. Hence there are three
		   possible inputs to choose from. */
		if (route->input > 2) {
			v4l_err(client, "Invalid input %d.\n", route->input);
			return -EINVAL;
		}
		cs53l32a_write(client, 0x01, 0x01 + (route->input << 4));
		break;

	case VIDIOC_G_CTRL:
		if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
			ctrl->value = (cs53l32a_read(client, 0x03) & 0xc0) != 0;
			break;
		}
		if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
			return -EINVAL;
		ctrl->value = (s8)cs53l32a_read(client, 0x04);
		break;

	case VIDIOC_S_CTRL:
		if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
			cs53l32a_write(client, 0x03, ctrl->value ? 0xf0 : 0x30);
			break;
		}
		if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
			return -EINVAL;
		if (ctrl->value > 12 || ctrl->value < -96)
			return -EINVAL;
		cs53l32a_write(client, 0x04, (u8) ctrl->value);
		cs53l32a_write(client, 0x05, (u8) ctrl->value);
		break;

	case VIDIOC_LOG_STATUS:
		{
			u8 v = cs53l32a_read(client, 0x01);
			u8 m = cs53l32a_read(client, 0x03);
			s8 vol = cs53l32a_read(client, 0x04);

			v4l_info(client, "Input:  %d%s\n", (v >> 4) & 3,
				      (m & 0xC0) ? " (muted)" : "");
			v4l_info(client, "Volume: %d dB\n", vol);
			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 cs53l32a_attach(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *client;
	int i;

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

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

	client->addr = address;
	client->adapter = adapter;
	client->driver = &i2c_driver;
	snprintf(client->name, sizeof(client->name) - 1, "cs53l32a");

	v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);

	for (i = 1; i <= 7; i++) {
		u8 v = cs53l32a_read(client, i);

		v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
	}

	/* Set cs53l32a internal register for Adaptec 2010/2410 setup */

	cs53l32a_write(client, 0x01, (u8) 0x21);
	cs53l32a_write(client, 0x02, (u8) 0x29);
	cs53l32a_write(client, 0x03, (u8) 0x30);
	cs53l32a_write(client, 0x04, (u8) 0x00);
	cs53l32a_write(client, 0x05, (u8) 0x00);
	cs53l32a_write(client, 0x06, (u8) 0x00);
	cs53l32a_write(client, 0x07, (u8) 0x00);

	/* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */

	for (i = 1; i <= 7; i++) {
		u8 v = cs53l32a_read(client, i);

		v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
	}

	i2c_attach_client(client);

	return 0;
}

static int cs53l32a_probe(struct i2c_adapter *adapter)
{
	if (adapter->class & I2C_CLASS_TV_ANALOG)
		return i2c_probe(adapter, &addr_data, cs53l32a_attach);
	return 0;
}

static int cs53l32a_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 = {
	.driver = {
		.name = "cs53l32a",
	},
	.id = I2C_DRIVERID_CS53L32A,
	.attach_adapter = cs53l32a_probe,
	.detach_client = cs53l32a_detach,
	.command = cs53l32a_command,
};


static int __init cs53l32a_init_module(void)
{
	return i2c_add_driver(&i2c_driver);
}

static void __exit cs53l32a_cleanup_module(void)
{
	i2c_del_driver(&i2c_driver);
}

module_init(cs53l32a_init_module);
module_exit(cs53l32a_cleanup_module);