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/*
* Picvue PVC160206 display driver
*
* Brian Murphy <brian.murphy@eicon.com>
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include "picvue.h"
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 = 0, scroll_interval = 0;
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_proc_read_line(char *page, char **start,
off_t off, int count,
int *eof, void *data)
{
char *origpage = page;
int lineno = *(int *)data;
if (lineno < 0 || lineno > PVC_NLINES) {
printk("proc_read_line: invalid lineno %d\n", lineno);
return 0;
}
down(&pvc_sem);
page += sprintf(page, "%s\n", pvc_lines[lineno]);
up(&pvc_sem);
return page - origpage;
}
static int pvc_proc_write_line(struct file *file, const char *buffer,
unsigned long count, void *data)
{
int origcount = count;
int lineno = *(int *)data;
if (lineno < 0 || lineno > PVC_NLINES) {
printk("proc_write_line: invalid lineno %d\n", lineno);
return origcount;
}
if (count > PVC_LINELEN)
count = PVC_LINELEN;
if (buffer[count-1] == '\n')
count--;
down(&pvc_sem);
strncpy(pvc_lines[lineno], buffer, count);
pvc_lines[lineno][count] = '\0';
up(&pvc_sem);
tasklet_schedule(&pvc_display_tasklet);
return origcount;
}
static int pvc_proc_write_scroll(struct file *file, const char *buffer,
unsigned long count, void *data)
{
int origcount = count;
int cmd = simple_strtol(buffer, NULL, 10);
down(&pvc_sem);
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);
}
up(&pvc_sem);
return origcount;
}
static int pvc_proc_read_scroll(char *page, char **start,
off_t off, int count,
int *eof, void *data)
{
char *origpage = page;
down(&pvc_sem);
page += sprintf(page, "%d\n", scroll_dir * scroll_interval);
up(&pvc_sem);
return page - origpage;
}
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 = create_proc_entry(pvc_linename[i], 0644, pvc_display_dir);
if (proc_entry == NULL)
goto error;
proc_entry->read_proc = pvc_proc_read_line;
proc_entry->write_proc = pvc_proc_write_line;
proc_entry->data = &pvc_linedata[i];
}
proc_entry = create_proc_entry("scroll", 0644, pvc_display_dir);
if (proc_entry == NULL)
goto error;
proc_entry->write_proc = pvc_proc_write_scroll;
proc_entry->read_proc = pvc_proc_read_scroll;
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");
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