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
|
/*
* ar0832_focuser.c - focuser driver
*
* Copyright (c) 2011, NVIDIA, All Rights Reserved.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/i2c.h>
#include <linux/miscdevice.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <media/ar0832_focuser.h>
#define POS_LOW 50
#define POS_HIGH 1000
#define SETTLETIME_MS 100
#define FOCAL_LENGTH (3.5f)
#define FNUMBER (2.8f)
#define FPOS_COUNT 1024
DEFINE_MUTEX(star_focuser_lock);
#define DW9716_MAX_RETRIES (3)
static int ar0832_focuser_write(struct i2c_client *client, u16 value)
{
int count;
struct i2c_msg msg[1];
unsigned char data[2];
int retry = 0;
if (!client->adapter)
return -ENODEV;
data[0] = (u8) ((value >> 4) & 0x3F);
data[1] = (u8) ((value & 0xF) << 4);
/* Slew rate control (8 steps, 50us) */
data[1] = (data[1] & 0xF0) | 0x05;
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].len = ARRAY_SIZE(data);
msg[0].buf = data;
do {
count = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
if (count == ARRAY_SIZE(msg))
return 0;
retry++;
pr_err("ar0832_focuser: i2c transfer failed, retrying %x\n",
value);
usleep_range(3000, 3500);
} while (retry <= DW9716_MAX_RETRIES);
return -EIO;
}
static int ar0832_focuser_write_helper(
struct ar0832_focuser_info *info, u16 value)
{
int ret;
switch (info->camera_mode) {
case MAIN:
case LEFT_ONLY:
ret = ar0832_focuser_write(info->i2c_client, value);
break;
case STEREO:
ret = ar0832_focuser_write(info->i2c_client, value);
ret = ar0832_focuser_write(info->i2c_client_right, value);
break;
case RIGHT_ONLY:
ret = ar0832_focuser_write(info->i2c_client_right, value);
break;
default:
return -1;
}
return ret;
}
static int ar0832_focuser_set_position(
struct ar0832_focuser_info *info, u32 position)
{
if (position < info->config.pos_low ||
position > info->config.pos_high)
return -EINVAL;
return ar0832_focuser_write(info->i2c_client, position);
}
static long ar0832_focuser_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
struct ar0832_focuser_info *info = file->private_data;
int ret;
switch (cmd) {
case AR0832_FOCUSER_IOCTL_GET_CONFIG:
{
if (copy_to_user((void __user *) arg,
&info->config,
sizeof(info->config))) {
pr_err("%s: 0x%x\n", __func__, __LINE__);
return -EFAULT;
}
break;
}
case AR0832_FOCUSER_IOCTL_SET_POSITION:
mutex_lock(&star_focuser_lock);
ret = ar0832_focuser_set_position(info, (u32) arg);
mutex_unlock(&star_focuser_lock);
return ret;
case AR0832_FOCUSER_IOCTL_SET_MODE:
info->camera_mode = (enum StereoCameraMode)arg;
break;
default:
return -EINVAL;
}
return 0;
}
static struct ar0832_focuser_info *info;
static int ar0832_focuser_open(struct inode *inode, struct file *file)
{
pr_info("ar0832_focuser: open!\n");
file->private_data = info;
return 0;
}
int ar0832_focuser_release(struct inode *inode, struct file *file)
{
pr_info("ar0832_focuser: release!\n");
file->private_data = NULL;
return 0;
}
static const struct file_operations ar0832_focuser_fileops = {
.owner = THIS_MODULE,
.open = ar0832_focuser_open,
.unlocked_ioctl = ar0832_focuser_ioctl,
.release = ar0832_focuser_release,
};
static struct miscdevice ar0832_focuser_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = "ar0832_focuser",
.fops = &ar0832_focuser_fileops,
};
static int ar0832_focuser_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int err;
pr_info("ar0832_focuser: probing sensor.\n");
info = kzalloc(sizeof(struct ar0832_focuser_info), GFP_KERNEL);
if (!info) {
pr_err("ar0832_focuser: Unable to allocate memory!\n");
return -ENOMEM;
}
err = misc_register(&ar0832_focuser_device);
if (err) {
pr_err("ar0832_focuser: Unable to register misc device!\n");
kfree(info);
return err;
}
info->regulator = 0;
info->i2c_client = client;
info->config.settle_time = SETTLETIME_MS;
/* FIX-ME */
/*
focuser_info->config.focal_length = FOCAL_LENGTH;
focuser_info->config.fnumber = FNUMBER;
*/
info->config.pos_low = POS_LOW;
info->config.pos_high = POS_HIGH;
i2c_set_clientdata(client, info);
return 0;
}
static int ar0832_focuser_remove(struct i2c_client *client)
{
struct ar0832_focuser_info *info;
info = i2c_get_clientdata(client);
misc_deregister(&ar0832_focuser_device);
kfree(info);
return 0;
}
static const struct i2c_device_id ar0832_focuser_id[] = {
{ "ar0832_focuser", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, ar0832_focuser_id);
static struct i2c_driver ar0832_focuser_i2c_driver = {
.driver = {
.name = "ar0832_focuser",
.owner = THIS_MODULE,
},
.probe = ar0832_focuser_probe,
.remove = ar0832_focuser_remove,
.id_table = ar0832_focuser_id,
};
static int __init ar0832_focuser_init(void)
{
pr_info("ar0832_focuser sensor driver loading\n");
i2c_add_driver(&ar0832_focuser_i2c_driver);
return 0;
}
static void __exit ar0832_focuser_exit(void)
{
i2c_del_driver(&ar0832_focuser_i2c_driver);
}
module_init(ar0832_focuser_init);
module_exit(ar0832_focuser_exit);
|
