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
|
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/ioport.h>
#include <linux/sysctl.h>
#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/soundcard.h>
#include <asm/uaccess.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/prom.h>
#include "tas_common.h"
#define CALL0(proc) \
do { \
struct tas_data_t *self; \
if (!tas_client || driver_hooks == NULL) \
return -1; \
self = dev_get_drvdata(&tas_client->dev); \
if (driver_hooks->proc) \
return driver_hooks->proc(self); \
else \
return -EINVAL; \
} while (0)
#define CALL(proc,arg...) \
do { \
struct tas_data_t *self; \
if (!tas_client || driver_hooks == NULL) \
return -1; \
self = dev_get_drvdata(&tas_client->dev); \
if (driver_hooks->proc) \
return driver_hooks->proc(self, ## arg); \
else \
return -EINVAL; \
} while (0)
static u8 tas_i2c_address = 0x34;
static struct i2c_client *tas_client;
static struct device_node* tas_node;
static int tas_attach_adapter(struct i2c_adapter *);
static int tas_detach_client(struct i2c_client *);
struct i2c_driver tas_driver = {
.owner = THIS_MODULE,
.name = "tas",
.flags = I2C_DF_NOTIFY,
.attach_adapter = tas_attach_adapter,
.detach_client = tas_detach_client,
};
struct tas_driver_hooks_t *driver_hooks;
int
tas_register_driver(struct tas_driver_hooks_t *hooks)
{
driver_hooks = hooks;
return 0;
}
int
tas_get_mixer_level(int mixer, uint *level)
{
CALL(get_mixer_level,mixer,level);
}
int
tas_set_mixer_level(int mixer,uint level)
{
CALL(set_mixer_level,mixer,level);
}
int
tas_enter_sleep(void)
{
CALL0(enter_sleep);
}
int
tas_leave_sleep(void)
{
CALL0(leave_sleep);
}
int
tas_supported_mixers(void)
{
CALL0(supported_mixers);
}
int
tas_mixer_is_stereo(int mixer)
{
CALL(mixer_is_stereo,mixer);
}
int
tas_stereo_mixers(void)
{
CALL0(stereo_mixers);
}
int
tas_output_device_change(int device_id,int layout_id,int speaker_id)
{
CALL(output_device_change,device_id,layout_id,speaker_id);
}
int
tas_device_ioctl(u_int cmd, u_long arg)
{
CALL(device_ioctl,cmd,arg);
}
int
tas_post_init(void)
{
CALL0(post_init);
}
static int
tas_detect_client(struct i2c_adapter *adapter, int address)
{
static const char *client_name = "tas Digital Equalizer";
struct i2c_client *new_client;
int rc = -ENODEV;
if (!driver_hooks) {
printk(KERN_ERR "tas_detect_client called with no hooks !\n");
return -ENODEV;
}
new_client = kmalloc(sizeof(*new_client), GFP_KERNEL);
if (!new_client)
return -ENOMEM;
memset(new_client, 0, sizeof(*new_client));
new_client->addr = address;
new_client->adapter = adapter;
new_client->driver = &tas_driver;
strlcpy(new_client->name, client_name, DEVICE_NAME_SIZE);
if (driver_hooks->init(new_client))
goto bail;
/* Tell the i2c layer a new client has arrived */
if (i2c_attach_client(new_client)) {
driver_hooks->uninit(dev_get_drvdata(&new_client->dev));
goto bail;
}
tas_client = new_client;
return 0;
bail:
tas_client = NULL;
kfree(new_client);
return rc;
}
static int
tas_attach_adapter(struct i2c_adapter *adapter)
{
if (!strncmp(adapter->name, "mac-io", 6))
return tas_detect_client(adapter, tas_i2c_address);
return 0;
}
static int
tas_detach_client(struct i2c_client *client)
{
if (client == tas_client) {
driver_hooks->uninit(dev_get_drvdata(&client->dev));
i2c_detach_client(client);
kfree(client);
}
return 0;
}
void
tas_cleanup(void)
{
i2c_del_driver(&tas_driver);
}
int __init
tas_init(int driver_id, const char *driver_name)
{
u32* paddr;
printk(KERN_INFO "tas driver [%s])\n", driver_name);
#ifndef CONFIG_I2C_KEYWEST
request_module("i2c-keywest");
#endif
tas_node = find_devices("deq");
if (tas_node == NULL)
return -ENODEV;
paddr = (u32 *)get_property(tas_node, "i2c-address", NULL);
if (paddr) {
tas_i2c_address = (*paddr) >> 1;
printk(KERN_INFO "using i2c address: 0x%x from device-tree\n",
tas_i2c_address);
} else
printk(KERN_INFO "using i2c address: 0x%x (default)\n",
tas_i2c_address);
return i2c_add_driver(&tas_driver);
}
|
