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
|
/*
* Picvue PVC160206 display driver
*
* Brian Murphy <brian.murphy@eicon.com>
*
*/
#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/mutex.h>
#include "picvue.h"
static DEFINE_MUTEX(pvc_mutex);
static char pvc_lines[PVC_NLINES][PVC_LINELEN+1];
static int pvc_linedata[PVC_NLINES];
static struct proc_dir_entry *pvc_display_dir;
static char *pvc_linename[PVC_NLINES] = {"line1", "line2"};
#define DISPLAY_DIR_NAME "display"
static int scroll_dir, scroll_interval;
static struct timer_list timer;
static void pvc_display(unsigned long data)
{
int i;
pvc_clear();
for (i = 0; i < PVC_NLINES; i++)
pvc_write_string(pvc_lines[i], 0, i);
}
static DECLARE_TASKLET(pvc_display_tasklet, &pvc_display, 0);
static int pvc_line_proc_show(struct seq_file *m, void *v)
{
int lineno = *(int *)m->private;
if (lineno < 0 || lineno > PVC_NLINES) {
printk(KERN_WARNING "proc_read_line: invalid lineno %d\n", lineno);
return 0;
}
mutex_lock(&pvc_mutex);
seq_printf(m, "%s\n", pvc_lines[lineno]);
mutex_unlock(&pvc_mutex);
return 0;
}
static int pvc_line_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, pvc_line_proc_show, PDE(inode)->data);
}
static ssize_t pvc_line_proc_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
int lineno = *(int *)PDE(file_inode(file))->data;
char kbuf[PVC_LINELEN];
size_t len;
BUG_ON(lineno < 0 || lineno > PVC_NLINES);
len = min(count, sizeof(kbuf) - 1);
if (copy_from_user(kbuf, buf, len))
return -EFAULT;
kbuf[len] = '\0';
if (len > 0 && kbuf[len - 1] == '\n')
len--;
mutex_lock(&pvc_mutex);
strncpy(pvc_lines[lineno], kbuf, len);
pvc_lines[lineno][len] = '\0';
mutex_unlock(&pvc_mutex);
tasklet_schedule(&pvc_display_tasklet);
return count;
}
static const struct file_operations pvc_line_proc_fops = {
.owner = THIS_MODULE,
.open = pvc_line_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = pvc_line_proc_write,
};
static ssize_t pvc_scroll_proc_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
char kbuf[42];
size_t len;
int cmd;
len = min(count, sizeof(kbuf) - 1);
if (copy_from_user(kbuf, buf, len))
return -EFAULT;
kbuf[len] = '\0';
cmd = simple_strtol(kbuf, NULL, 10);
mutex_lock(&pvc_mutex);
if (scroll_interval != 0)
del_timer(&timer);
if (cmd == 0) {
scroll_dir = 0;
scroll_interval = 0;
} else {
if (cmd < 0) {
scroll_dir = -1;
scroll_interval = -cmd;
} else {
scroll_dir = 1;
scroll_interval = cmd;
}
add_timer(&timer);
}
mutex_unlock(&pvc_mutex);
return count;
}
static int pvc_scroll_proc_show(struct seq_file *m, void *v)
{
mutex_lock(&pvc_mutex);
seq_printf(m, "%d\n", scroll_dir * scroll_interval);
mutex_unlock(&pvc_mutex);
return 0;
}
static int pvc_scroll_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, pvc_scroll_proc_show, NULL);
}
static const struct file_operations pvc_scroll_proc_fops = {
.owner = THIS_MODULE,
.open = pvc_scroll_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = pvc_scroll_proc_write,
};
void pvc_proc_timerfunc(unsigned long data)
{
if (scroll_dir < 0)
pvc_move(DISPLAY|RIGHT);
else if (scroll_dir > 0)
pvc_move(DISPLAY|LEFT);
timer.expires = jiffies + scroll_interval;
add_timer(&timer);
}
static void pvc_proc_cleanup(void)
{
int i;
for (i = 0; i < PVC_NLINES; i++)
remove_proc_entry(pvc_linename[i], pvc_display_dir);
remove_proc_entry("scroll", pvc_display_dir);
remove_proc_entry(DISPLAY_DIR_NAME, NULL);
del_timer(&timer);
}
static int __init pvc_proc_init(void)
{
struct proc_dir_entry *proc_entry;
int i;
pvc_display_dir = proc_mkdir(DISPLAY_DIR_NAME, NULL);
if (pvc_display_dir == NULL)
goto error;
for (i = 0; i < PVC_NLINES; i++) {
strcpy(pvc_lines[i], "");
pvc_linedata[i] = i;
}
for (i = 0; i < PVC_NLINES; i++) {
proc_entry = proc_create_data(pvc_linename[i], 0644, pvc_display_dir,
&pvc_line_proc_fops, &pvc_linedata[i]);
if (proc_entry == NULL)
goto error;
}
proc_entry = proc_create("scroll", 0644, pvc_display_dir,
&pvc_scroll_proc_fops);
if (proc_entry == NULL)
goto error;
init_timer(&timer);
timer.function = pvc_proc_timerfunc;
return 0;
error:
pvc_proc_cleanup();
return -ENOMEM;
}
module_init(pvc_proc_init);
module_exit(pvc_proc_cleanup);
MODULE_LICENSE("GPL");
|
