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