1/*
2 * cs53l32a (Adaptec AVC-2010 and AVC-2410) i2c ivtv driver.
3 * Copyright (C) 2005  Martin Vaughan
4 *
5 * Audio source switching for Adaptec AVC-2410 added by Trev Jackson
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22
23#include <linux/module.h>
24#include <linux/types.h>
25#include <linux/ioctl.h>
26#include <asm/uaccess.h>
27#include <linux/i2c.h>
28#include <linux/i2c-id.h>
29#include <linux/videodev.h>
30#include <media/v4l2-common.h>
31#include <media/v4l2-chip-ident.h>
32
33MODULE_DESCRIPTION("i2c device driver for cs53l32a Audio ADC");
34MODULE_AUTHOR("Martin Vaughan");
35MODULE_LICENSE("GPL");
36
37static int debug = 0;
38
39module_param(debug, bool, 0644);
40
41MODULE_PARM_DESC(debug, "Debugging messages\n\t\t\t0=Off (default), 1=On");
42
43static unsigned short normal_i2c[] = { 0x22 >> 1, I2C_CLIENT_END };
44
45
46I2C_CLIENT_INSMOD;
47
48/* ----------------------------------------------------------------------- */
49
50static int cs53l32a_write(struct i2c_client *client, u8 reg, u8 value)
51{
52	return i2c_smbus_write_byte_data(client, reg, value);
53}
54
55static int cs53l32a_read(struct i2c_client *client, u8 reg)
56{
57	return i2c_smbus_read_byte_data(client, reg);
58}
59
60static int cs53l32a_command(struct i2c_client *client, unsigned int cmd,
61			    void *arg)
62{
63	struct v4l2_routing *route = arg;
64	struct v4l2_control *ctrl = arg;
65
66	switch (cmd) {
67	case VIDIOC_INT_G_AUDIO_ROUTING:
68		route->input = (cs53l32a_read(client, 0x01) >> 4) & 3;
69		route->output = 0;
70		break;
71
72	case VIDIOC_INT_S_AUDIO_ROUTING:
73		/* There are 2 physical inputs, but the second input can be
74		   placed in two modes, the first mode bypasses the PGA (gain),
75		   the second goes through the PGA. Hence there are three
76		   possible inputs to choose from. */
77		if (route->input > 2) {
78			v4l_err(client, "Invalid input %d.\n", route->input);
79			return -EINVAL;
80		}
81		cs53l32a_write(client, 0x01, 0x01 + (route->input << 4));
82		break;
83
84	case VIDIOC_G_CTRL:
85		if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
86			ctrl->value = (cs53l32a_read(client, 0x03) & 0xc0) != 0;
87			break;
88		}
89		if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
90			return -EINVAL;
91		ctrl->value = (s8)cs53l32a_read(client, 0x04);
92		break;
93
94	case VIDIOC_S_CTRL:
95		if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
96			cs53l32a_write(client, 0x03, ctrl->value ? 0xf0 : 0x30);
97			break;
98		}
99		if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
100			return -EINVAL;
101		if (ctrl->value > 12 || ctrl->value < -96)
102			return -EINVAL;
103		cs53l32a_write(client, 0x04, (u8) ctrl->value);
104		cs53l32a_write(client, 0x05, (u8) ctrl->value);
105		break;
106
107	case VIDIOC_G_CHIP_IDENT:
108		return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_CS53l32A, 0);
109
110	case VIDIOC_LOG_STATUS:
111		{
112			u8 v = cs53l32a_read(client, 0x01);
113			u8 m = cs53l32a_read(client, 0x03);
114			s8 vol = cs53l32a_read(client, 0x04);
115
116			v4l_info(client, "Input:  %d%s\n", (v >> 4) & 3,
117				      (m & 0xC0) ? " (muted)" : "");
118			v4l_info(client, "Volume: %d dB\n", vol);
119			break;
120		}
121
122	default:
123		return -EINVAL;
124	}
125	return 0;
126}
127
128/* ----------------------------------------------------------------------- */
129
130/* i2c implementation */
131
132/*
133 * Generic i2c probe
134 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
135 */
136
137static struct i2c_driver i2c_driver;
138
139static int cs53l32a_attach(struct i2c_adapter *adapter, int address, int kind)
140{
141	struct i2c_client *client;
142	int i;
143
144	/* Check if the adapter supports the needed features */
145	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
146		return 0;
147
148	client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
149	if (client == 0)
150		return -ENOMEM;
151
152	client->addr = address;
153	client->adapter = adapter;
154	client->driver = &i2c_driver;
155	snprintf(client->name, sizeof(client->name) - 1, "cs53l32a");
156
157	v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
158
159	for (i = 1; i <= 7; i++) {
160		u8 v = cs53l32a_read(client, i);
161
162		v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
163	}
164
165	/* Set cs53l32a internal register for Adaptec 2010/2410 setup */
166
167	cs53l32a_write(client, 0x01, (u8) 0x21);
168	cs53l32a_write(client, 0x02, (u8) 0x29);
169	cs53l32a_write(client, 0x03, (u8) 0x30);
170	cs53l32a_write(client, 0x04, (u8) 0x00);
171	cs53l32a_write(client, 0x05, (u8) 0x00);
172	cs53l32a_write(client, 0x06, (u8) 0x00);
173	cs53l32a_write(client, 0x07, (u8) 0x00);
174
175	/* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */
176
177	for (i = 1; i <= 7; i++) {
178		u8 v = cs53l32a_read(client, i);
179
180		v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
181	}
182
183	i2c_attach_client(client);
184
185	return 0;
186}
187
188static int cs53l32a_probe(struct i2c_adapter *adapter)
189{
190	if (adapter->class & I2C_CLASS_TV_ANALOG)
191		return i2c_probe(adapter, &addr_data, cs53l32a_attach);
192	return 0;
193}
194
195static int cs53l32a_detach(struct i2c_client *client)
196{
197	int err;
198
199	err = i2c_detach_client(client);
200	if (err) {
201		return err;
202	}
203	kfree(client);
204
205	return 0;
206}
207
208/* ----------------------------------------------------------------------- */
209
210/* i2c implementation */
211static struct i2c_driver i2c_driver = {
212	.driver = {
213		.name = "cs53l32a",
214	},
215	.id = I2C_DRIVERID_CS53L32A,
216	.attach_adapter = cs53l32a_probe,
217	.detach_client = cs53l32a_detach,
218	.command = cs53l32a_command,
219};
220
221
222static int __init cs53l32a_init_module(void)
223{
224	return i2c_add_driver(&i2c_driver);
225}
226
227static void __exit cs53l32a_cleanup_module(void)
228{
229	i2c_del_driver(&i2c_driver);
230}
231
232module_init(cs53l32a_init_module);
233module_exit(cs53l32a_cleanup_module);
234