150 lines
3.1 KiB
C
150 lines
3.1 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/string.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/auxio.h>
|
|
|
|
#define LED_MAX_LENGTH 8 /* maximum chars written to proc file */
|
|
|
|
static inline void led_toggle(void)
|
|
{
|
|
unsigned char val = get_auxio();
|
|
unsigned char on, off;
|
|
|
|
if (val & AUXIO_LED) {
|
|
on = 0;
|
|
off = AUXIO_LED;
|
|
} else {
|
|
on = AUXIO_LED;
|
|
off = 0;
|
|
}
|
|
|
|
set_auxio(on, off);
|
|
}
|
|
|
|
static struct timer_list led_blink_timer;
|
|
|
|
static void led_blink(unsigned long timeout)
|
|
{
|
|
led_toggle();
|
|
|
|
/* reschedule */
|
|
if (!timeout) { /* blink according to load */
|
|
led_blink_timer.expires = jiffies +
|
|
((1 + (avenrun[0] >> FSHIFT)) * HZ);
|
|
led_blink_timer.data = 0;
|
|
} else { /* blink at user specified interval */
|
|
led_blink_timer.expires = jiffies + (timeout * HZ);
|
|
led_blink_timer.data = timeout;
|
|
}
|
|
add_timer(&led_blink_timer);
|
|
}
|
|
|
|
static int led_proc_show(struct seq_file *m, void *v)
|
|
{
|
|
if (get_auxio() & AUXIO_LED)
|
|
seq_puts(m, "on\n");
|
|
else
|
|
seq_puts(m, "off\n");
|
|
return 0;
|
|
}
|
|
|
|
static int led_proc_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, led_proc_show, NULL);
|
|
}
|
|
|
|
static ssize_t led_proc_write(struct file *file, const char __user *buffer,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *buf = NULL;
|
|
|
|
if (count > LED_MAX_LENGTH)
|
|
count = LED_MAX_LENGTH;
|
|
|
|
buf = kmalloc(sizeof(char) * (count + 1), GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(buf, buffer, count)) {
|
|
kfree(buf);
|
|
return -EFAULT;
|
|
}
|
|
|
|
buf[count] = '\0';
|
|
|
|
/* work around \n when echo'ing into proc */
|
|
if (buf[count - 1] == '\n')
|
|
buf[count - 1] = '\0';
|
|
|
|
/* before we change anything we want to stop any running timers,
|
|
* otherwise calls such as on will have no persistent effect
|
|
*/
|
|
del_timer_sync(&led_blink_timer);
|
|
|
|
if (!strcmp(buf, "on")) {
|
|
auxio_set_led(AUXIO_LED_ON);
|
|
} else if (!strcmp(buf, "toggle")) {
|
|
led_toggle();
|
|
} else if ((*buf > '0') && (*buf <= '9')) {
|
|
led_blink(simple_strtoul(buf, NULL, 10));
|
|
} else if (!strcmp(buf, "load")) {
|
|
led_blink(0);
|
|
} else {
|
|
auxio_set_led(AUXIO_LED_OFF);
|
|
}
|
|
|
|
kfree(buf);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations led_proc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = led_proc_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
.write = led_proc_write,
|
|
};
|
|
|
|
static struct proc_dir_entry *led;
|
|
|
|
#define LED_VERSION "0.1"
|
|
|
|
static int __init led_init(void)
|
|
{
|
|
init_timer(&led_blink_timer);
|
|
led_blink_timer.function = led_blink;
|
|
|
|
led = proc_create("led", 0, NULL, &led_proc_fops);
|
|
if (!led)
|
|
return -ENOMEM;
|
|
|
|
printk(KERN_INFO
|
|
"led: version %s, Lars Kotthoff <metalhead@metalhead.ws>\n",
|
|
LED_VERSION);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit led_exit(void)
|
|
{
|
|
remove_proc_entry("led", NULL);
|
|
del_timer_sync(&led_blink_timer);
|
|
}
|
|
|
|
module_init(led_init);
|
|
module_exit(led_exit);
|
|
|
|
MODULE_AUTHOR("Lars Kotthoff <metalhead@metalhead.ws>");
|
|
MODULE_DESCRIPTION("Provides control of the front LED on SPARC systems.");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(LED_VERSION);
|