1#include <linux/kernel.h>
  2#include <linux/module.h>
  3#include <linux/init.h>
  4#include <linux/proc_fs.h>
  5#include <linux/seq_file.h>
  6#include <linux/slab.h>
  7#include <linux/string.h>
  8#include <linux/jiffies.h>
  9#include <linux/timer.h>
 10#include <linux/uaccess.h>
 
 11
 12#include <asm/auxio.h>
 13
 14#define LED_MAX_LENGTH 8 /* maximum chars written to proc file */
 15
 16static inline void led_toggle(void)
 17{
 18	unsigned char val = get_auxio();
 19	unsigned char on, off;
 20
 21	if (val & AUXIO_LED) {
 22		on = 0;
 23		off = AUXIO_LED;
 24	} else {
 25		on = AUXIO_LED;
 26		off = 0;
 27	}
 28
 29	set_auxio(on, off);
 30}
 31
 32static struct timer_list led_blink_timer;
 
 33
 34static void led_blink(unsigned long timeout)
 35{
 
 
 36	led_toggle();
 37
 38	/* reschedule */
 39	if (!timeout) { /* blink according to load */
 40		led_blink_timer.expires = jiffies +
 41			((1 + (avenrun[0] >> FSHIFT)) * HZ);
 42		led_blink_timer.data = 0;
 43	} else { /* blink at user specified interval */
 44		led_blink_timer.expires = jiffies + (timeout * HZ);
 45		led_blink_timer.data = timeout;
 46	}
 47	add_timer(&led_blink_timer);
 48}
 49
 50static int led_proc_show(struct seq_file *m, void *v)
 51{
 52	if (get_auxio() & AUXIO_LED)
 53		seq_puts(m, "on\n");
 54	else
 55		seq_puts(m, "off\n");
 56	return 0;
 57}
 58
 59static int led_proc_open(struct inode *inode, struct file *file)
 60{
 61	return single_open(file, led_proc_show, NULL);
 62}
 63
 64static ssize_t led_proc_write(struct file *file, const char __user *buffer,
 65			      size_t count, loff_t *ppos)
 66{
 67	char *buf = NULL;
 68
 69	if (count > LED_MAX_LENGTH)
 70		count = LED_MAX_LENGTH;
 71
 72	buf = kmalloc(sizeof(char) * (count + 1), GFP_KERNEL);
 73	if (!buf)
 74		return -ENOMEM;
 75
 76	if (copy_from_user(buf, buffer, count)) {
 77		kfree(buf);
 78		return -EFAULT;
 79	}
 80
 81	buf[count] = '\0';
 82
 83	/* work around \n when echo'ing into proc */
 84	if (buf[count - 1] == '\n')
 85		buf[count - 1] = '\0';
 86
 87	/* before we change anything we want to stop any running timers,
 88	 * otherwise calls such as on will have no persistent effect
 89	 */
 90	del_timer_sync(&led_blink_timer);
 91
 92	if (!strcmp(buf, "on")) {
 93		auxio_set_led(AUXIO_LED_ON);
 94	} else if (!strcmp(buf, "toggle")) {
 95		led_toggle();
 96	} else if ((*buf > '0') && (*buf <= '9')) {
 97		led_blink(simple_strtoul(buf, NULL, 10));
 
 98	} else if (!strcmp(buf, "load")) {
 99		led_blink(0);
 
100	} else {
101		auxio_set_led(AUXIO_LED_OFF);
102	}
103
104	kfree(buf);
105
106	return count;
107}
108
109static const struct file_operations led_proc_fops = {
110	.owner		= THIS_MODULE,
111	.open		= led_proc_open,
112	.read		= seq_read,
113	.llseek		= seq_lseek,
114	.release	= single_release,
115	.write		= led_proc_write,
116};
117
118static struct proc_dir_entry *led;
119
120#define LED_VERSION	"0.1"
121
122static int __init led_init(void)
123{
124	init_timer(&led_blink_timer);
125	led_blink_timer.function = led_blink;
126
127	led = proc_create("led", 0, NULL, &led_proc_fops);
128	if (!led)
129		return -ENOMEM;
130
131	printk(KERN_INFO
132	       "led: version %s, Lars Kotthoff <metalhead@metalhead.ws>\n",
133	       LED_VERSION);
134
135	return 0;
136}
137
138static void __exit led_exit(void)
139{
140	remove_proc_entry("led", NULL);
141	del_timer_sync(&led_blink_timer);
142}
143
144module_init(led_init);
145module_exit(led_exit);
146
147MODULE_AUTHOR("Lars Kotthoff <metalhead@metalhead.ws>");
148MODULE_DESCRIPTION("Provides control of the front LED on SPARC systems.");
149MODULE_LICENSE("GPL");
150MODULE_VERSION(LED_VERSION);

  1// SPDX-License-Identifier: GPL-2.0-only
  2#include <linux/kernel.h>
  3#include <linux/module.h>
  4#include <linux/init.h>
  5#include <linux/proc_fs.h>
  6#include <linux/seq_file.h>
  7#include <linux/slab.h>
  8#include <linux/string.h>
  9#include <linux/jiffies.h>
 10#include <linux/timer.h>
 11#include <linux/uaccess.h>
 12#include <linux/sched/loadavg.h>
 13
 14#include <asm/auxio.h>
 15
 16#define LED_MAX_LENGTH 8 /* maximum chars written to proc file */
 17
 18static inline void led_toggle(void)
 19{
 20	unsigned char val = get_auxio();
 21	unsigned char on, off;
 22
 23	if (val & AUXIO_LED) {
 24		on = 0;
 25		off = AUXIO_LED;
 26	} else {
 27		on = AUXIO_LED;
 28		off = 0;
 29	}
 30
 31	set_auxio(on, off);
 32}
 33
 34static struct timer_list led_blink_timer;
 35static unsigned long led_blink_timer_timeout;
 36
 37static void led_blink(struct timer_list *unused)
 38{
 39	unsigned long timeout = led_blink_timer_timeout;
 40
 41	led_toggle();
 42
 43	/* reschedule */
 44	if (!timeout) { /* blink according to load */
 45		led_blink_timer.expires = jiffies +
 46			((1 + (avenrun[0] >> FSHIFT)) * HZ);
 
 47	} else { /* blink at user specified interval */
 48		led_blink_timer.expires = jiffies + (timeout * HZ);
 
 49	}
 50	add_timer(&led_blink_timer);
 51}
 52
 53static int led_proc_show(struct seq_file *m, void *v)
 54{
 55	if (get_auxio() & AUXIO_LED)
 56		seq_puts(m, "on\n");
 57	else
 58		seq_puts(m, "off\n");
 59	return 0;
 60}
 61
 62static int led_proc_open(struct inode *inode, struct file *file)
 63{
 64	return single_open(file, led_proc_show, NULL);
 65}
 66
 67static ssize_t led_proc_write(struct file *file, const char __user *buffer,
 68			      size_t count, loff_t *ppos)
 69{
 70	char *buf = NULL;
 71
 72	if (count > LED_MAX_LENGTH)
 73		count = LED_MAX_LENGTH;
 74
 75	buf = memdup_user_nul(buffer, count);
 76	if (IS_ERR(buf))
 77		return PTR_ERR(buf);
 
 
 
 
 
 
 
 78
 79	/* work around \n when echo'ing into proc */
 80	if (buf[count - 1] == '\n')
 81		buf[count - 1] = '\0';
 82
 83	/* before we change anything we want to stop any running timers,
 84	 * otherwise calls such as on will have no persistent effect
 85	 */
 86	del_timer_sync(&led_blink_timer);
 87
 88	if (!strcmp(buf, "on")) {
 89		auxio_set_led(AUXIO_LED_ON);
 90	} else if (!strcmp(buf, "toggle")) {
 91		led_toggle();
 92	} else if ((*buf > '0') && (*buf <= '9')) {
 93		led_blink_timer_timeout = simple_strtoul(buf, NULL, 10);
 94		led_blink(&led_blink_timer);
 95	} else if (!strcmp(buf, "load")) {
 96		led_blink_timer_timeout = 0;
 97		led_blink(&led_blink_timer);
 98	} else {
 99		auxio_set_led(AUXIO_LED_OFF);
100	}
101
102	kfree(buf);
103
104	return count;
105}
106
107static const struct proc_ops led_proc_ops = {
108	.proc_open	= led_proc_open,
109	.proc_read	= seq_read,
110	.proc_lseek	= seq_lseek,
111	.proc_release	= single_release,
112	.proc_write	= led_proc_write,
 
113};
114
115static struct proc_dir_entry *led;
116
117#define LED_VERSION	"0.1"
118
119static int __init led_init(void)
120{
121	timer_setup(&led_blink_timer, led_blink, 0);
 
122
123	led = proc_create("led", 0, NULL, &led_proc_ops);
124	if (!led)
125		return -ENOMEM;
126
127	printk(KERN_INFO
128	       "led: version %s, Lars Kotthoff <metalhead@metalhead.ws>\n",
129	       LED_VERSION);
130
131	return 0;
132}
133
134static void __exit led_exit(void)
135{
136	remove_proc_entry("led", NULL);
137	del_timer_sync(&led_blink_timer);
138}
139
140module_init(led_init);
141module_exit(led_exit);
142
143MODULE_AUTHOR("Lars Kotthoff <metalhead@metalhead.ws>");
144MODULE_DESCRIPTION("Provides control of the front LED on SPARC systems.");
145MODULE_LICENSE("GPL");
146MODULE_VERSION(LED_VERSION);