mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 18:39:59 +00:00
![Alexey Dobriyan](/assets/img/avatar_default.png)
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: akpm@linux-foundation.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/725/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
216 lines
4.6 KiB
C
216 lines
4.6 KiB
C
/*
|
|
* 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->f_path.dentry->d_inode)->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");
|