1 #include <linux/proc_fs.h>
2 #include <linux/seq_file.h>
3 #include <linux/suspend.h>
5 #include <asm/uaccess.h>
7 #include <acpi/acpi_bus.h>
8 #include <acpi/acpi_drivers.h>
11 #include <linux/mc146818rtc.h>
16 #define ACPI_SYSTEM_FILE_SLEEP "sleep"
17 #define ACPI_SYSTEM_FILE_ALARM "alarm"
19 #define _COMPONENT ACPI_SYSTEM_COMPONENT
20 ACPI_MODULE_NAME ("sleep")
23 static int acpi_system_sleep_seq_show(struct seq_file *seq, void *offset)
27 ACPI_FUNCTION_TRACE("acpi_system_sleep_seq_show");
29 for (i = 0; i <= ACPI_STATE_S5; i++) {
30 if (sleep_states[i]) {
31 seq_printf(seq,"S%d ", i);
32 if (i == ACPI_STATE_S4 && acpi_gbl_FACS->S4bios_f)
33 seq_printf(seq, "S4bios ");
42 static int acpi_system_sleep_open_fs(struct inode *inode, struct file *file)
44 return single_open(file, acpi_system_sleep_seq_show, PDE(inode)->data);
48 acpi_system_write_sleep (
50 const char __user *buffer,
58 if (count > sizeof(str) - 1)
60 memset(str,0,sizeof(str));
61 if (copy_from_user(str, buffer, count))
64 /* Check for S4 bios request */
65 if (!strcmp(str,"4b")) {
66 error = acpi_suspend(4);
69 state = simple_strtoul(str, NULL, 0);
70 #ifdef CONFIG_SOFTWARE_SUSPEND
76 error = acpi_suspend(state);
78 return error ? error : count;
81 static int acpi_system_alarm_seq_show(struct seq_file *seq, void *offset)
86 ACPI_FUNCTION_TRACE("acpi_system_alarm_seq_show");
90 sec = CMOS_READ(RTC_SECONDS_ALARM);
91 min = CMOS_READ(RTC_MINUTES_ALARM);
92 hr = CMOS_READ(RTC_HOURS_ALARM);
94 #if 0 /* If we ever get an FACP with proper values... */
95 if (acpi_gbl_FADT->day_alrm)
96 day = CMOS_READ(acpi_gbl_FADT->day_alrm);
98 day = CMOS_READ(RTC_DAY_OF_MONTH);
99 if (acpi_gbl_FADT->mon_alrm)
100 mo = CMOS_READ(acpi_gbl_FADT->mon_alrm);
102 mo = CMOS_READ(RTC_MONTH);
103 if (acpi_gbl_FADT->century)
104 yr = CMOS_READ(acpi_gbl_FADT->century) * 100 + CMOS_READ(RTC_YEAR);
106 yr = CMOS_READ(RTC_YEAR);
108 day = CMOS_READ(RTC_DAY_OF_MONTH);
109 mo = CMOS_READ(RTC_MONTH);
110 yr = CMOS_READ(RTC_YEAR);
113 spin_unlock(&rtc_lock);
123 /* we're trusting the FADT (see above)*/
125 /* If we're not trusting the FADT, we should at least make it
126 * right for _this_ century... ehm, what is _this_ century?
129 * ASAP: find piece of code in the kernel, e.g. star tracker driver,
130 * which we can trust to determine the century correctly. Atom
131 * watch driver would be nice, too...
133 * if that has not happened, change for first release in 2050:
137 * yr += 2000; // current line of code
139 * if that has not happened either, please do on 2099/12/31:23:59:59
146 seq_printf(seq,"%4.4u-", yr);
147 (mo > 12) ? seq_puts(seq, "**-") : seq_printf(seq, "%2.2u-", mo);
148 (day > 31) ? seq_puts(seq, "** ") : seq_printf(seq, "%2.2u ", day);
149 (hr > 23) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", hr);
150 (min > 59) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", min);
151 (sec > 59) ? seq_puts(seq, "**\n") : seq_printf(seq, "%2.2u\n", sec);
156 static int acpi_system_alarm_open_fs(struct inode *inode, struct file *file)
158 return single_open(file, acpi_system_alarm_seq_show, PDE(inode)->data);
168 char *string_end = NULL;
169 int result = -EINVAL;
172 * Try to find delimeter, only to insert null. The end of the
173 * string won't have one, but is still valid.
175 next = strpbrk(*p, "- :");
179 *value = simple_strtoul(*p, &string_end, 10);
181 /* Signal success if we got a good digit */
182 if (string_end != *p)
193 acpi_system_write_alarm (
195 const char __user *buffer,
200 char alarm_string[30] = {'\0'};
201 char *p = alarm_string;
202 u32 sec, min, hr, day, mo, yr;
204 unsigned char rtc_control = 0;
206 ACPI_FUNCTION_TRACE("acpi_system_write_alarm");
208 if (count > sizeof(alarm_string) - 1)
209 return_VALUE(-EINVAL);
211 if (copy_from_user(alarm_string, buffer, count))
212 return_VALUE(-EFAULT);
214 alarm_string[count] = '\0';
216 /* check for time adjustment */
217 if (alarm_string[0] == '+') {
222 if ((result = get_date_field(&p, &yr)))
224 if ((result = get_date_field(&p, &mo)))
226 if ((result = get_date_field(&p, &day)))
228 if ((result = get_date_field(&p, &hr)))
230 if ((result = get_date_field(&p, &min)))
232 if ((result = get_date_field(&p, &sec)))
256 spin_lock_irq(&rtc_lock);
258 rtc_control = CMOS_READ(RTC_CONTROL);
259 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
269 yr += CMOS_READ(RTC_YEAR);
270 mo += CMOS_READ(RTC_MONTH);
271 day += CMOS_READ(RTC_DAY_OF_MONTH);
272 hr += CMOS_READ(RTC_HOURS);
273 min += CMOS_READ(RTC_MINUTES);
274 sec += CMOS_READ(RTC_SECONDS);
277 spin_unlock_irq(&rtc_lock);
279 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
308 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
317 spin_lock_irq(&rtc_lock);
319 /* write the fields the rtc knows about */
320 CMOS_WRITE(hr, RTC_HOURS_ALARM);
321 CMOS_WRITE(min, RTC_MINUTES_ALARM);
322 CMOS_WRITE(sec, RTC_SECONDS_ALARM);
325 * If the system supports an enhanced alarm it will have non-zero
326 * offsets into the CMOS RAM here -- which for some reason are pointing
327 * to the RTC area of memory.
330 if (acpi_gbl_FADT->day_alrm)
331 CMOS_WRITE(day, acpi_gbl_FADT->day_alrm);
332 if (acpi_gbl_FADT->mon_alrm)
333 CMOS_WRITE(mo, acpi_gbl_FADT->mon_alrm);
334 if (acpi_gbl_FADT->century)
335 CMOS_WRITE(yr/100, acpi_gbl_FADT->century);
337 /* enable the rtc alarm interrupt */
338 if (!(rtc_control & RTC_AIE)) {
339 rtc_control |= RTC_AIE;
340 CMOS_WRITE(rtc_control,RTC_CONTROL);
341 CMOS_READ(RTC_INTR_FLAGS);
344 spin_unlock_irq(&rtc_lock);
346 acpi_set_register(ACPI_BITREG_RT_CLOCK_ENABLE, 1, ACPI_MTX_LOCK);
348 file->f_pos += count;
352 return_VALUE(result ? result : count);
356 static struct file_operations acpi_system_sleep_fops = {
357 .open = acpi_system_sleep_open_fs,
359 .write = acpi_system_write_sleep,
361 .release = single_release,
364 static struct file_operations acpi_system_alarm_fops = {
365 .open = acpi_system_alarm_open_fs,
367 .write = acpi_system_write_alarm,
369 .release = single_release,
373 static int acpi_sleep_proc_init(void)
375 struct proc_dir_entry *entry = NULL;
381 entry = create_proc_entry(ACPI_SYSTEM_FILE_SLEEP,
382 S_IFREG|S_IRUGO|S_IWUSR, acpi_root_dir);
384 entry->proc_fops = &acpi_system_sleep_fops;
387 entry = create_proc_entry(ACPI_SYSTEM_FILE_ALARM,
388 S_IFREG|S_IRUGO|S_IWUSR, acpi_root_dir);
390 entry->proc_fops = &acpi_system_alarm_fops;
394 late_initcall(acpi_sleep_proc_init);