Root/drivers/acpi/proc.c

1#include <linux/proc_fs.h>
2#include <linux/seq_file.h>
3#include <linux/export.h>
4#include <linux/suspend.h>
5#include <linux/bcd.h>
6#include <asm/uaccess.h>
7
8#include <acpi/acpi_bus.h>
9#include <acpi/acpi_drivers.h>
10
11#ifdef CONFIG_X86
12#include <linux/mc146818rtc.h>
13#endif
14
15#include "sleep.h"
16
17#define _COMPONENT ACPI_SYSTEM_COMPONENT
18
19/*
20 * this file provides support for:
21 * /proc/acpi/alarm
22 * /proc/acpi/wakeup
23 */
24
25ACPI_MODULE_NAME("sleep")
26
27#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || !defined(CONFIG_X86)
28/* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */
29#else
30#define HAVE_ACPI_LEGACY_ALARM
31#endif
32
33#ifdef HAVE_ACPI_LEGACY_ALARM
34
35static u32 cmos_bcd_read(int offset, int rtc_control);
36
37static int acpi_system_alarm_seq_show(struct seq_file *seq, void *offset)
38{
39    u32 sec, min, hr;
40    u32 day, mo, yr, cent = 0;
41    u32 today = 0;
42    unsigned char rtc_control = 0;
43    unsigned long flags;
44
45    spin_lock_irqsave(&rtc_lock, flags);
46
47    rtc_control = CMOS_READ(RTC_CONTROL);
48    sec = cmos_bcd_read(RTC_SECONDS_ALARM, rtc_control);
49    min = cmos_bcd_read(RTC_MINUTES_ALARM, rtc_control);
50    hr = cmos_bcd_read(RTC_HOURS_ALARM, rtc_control);
51
52    /* If we ever get an FACP with proper values... */
53    if (acpi_gbl_FADT.day_alarm) {
54        /* ACPI spec: only low 6 its should be cared */
55        day = CMOS_READ(acpi_gbl_FADT.day_alarm) & 0x3F;
56        if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
57            day = bcd2bin(day);
58    } else
59        day = cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
60    if (acpi_gbl_FADT.month_alarm)
61        mo = cmos_bcd_read(acpi_gbl_FADT.month_alarm, rtc_control);
62    else {
63        mo = cmos_bcd_read(RTC_MONTH, rtc_control);
64        today = cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
65    }
66    if (acpi_gbl_FADT.century)
67        cent = cmos_bcd_read(acpi_gbl_FADT.century, rtc_control);
68
69    yr = cmos_bcd_read(RTC_YEAR, rtc_control);
70
71    spin_unlock_irqrestore(&rtc_lock, flags);
72
73    /* we're trusting the FADT (see above) */
74    if (!acpi_gbl_FADT.century)
75        /* If we're not trusting the FADT, we should at least make it
76         * right for _this_ century... ehm, what is _this_ century?
77         *
78         * TBD:
79         * ASAP: find piece of code in the kernel, e.g. star tracker driver,
80         * which we can trust to determine the century correctly. Atom
81         * watch driver would be nice, too...
82         *
83         * if that has not happened, change for first release in 2050:
84         * if (yr<50)
85         * yr += 2100;
86         * else
87         * yr += 2000; // current line of code
88         *
89         * if that has not happened either, please do on 2099/12/31:23:59:59
90         * s/2000/2100
91         *
92         */
93        yr += 2000;
94    else
95        yr += cent * 100;
96
97    /*
98     * Show correct dates for alarms up to a month into the future.
99     * This solves issues for nearly all situations with the common
100     * 30-day alarm clocks in PC hardware.
101     */
102    if (day < today) {
103        if (mo < 12) {
104            mo += 1;
105        } else {
106            mo = 1;
107            yr += 1;
108        }
109    }
110
111    seq_printf(seq, "%4.4u-", yr);
112    (mo > 12) ? seq_puts(seq, "**-") : seq_printf(seq, "%2.2u-", mo);
113    (day > 31) ? seq_puts(seq, "** ") : seq_printf(seq, "%2.2u ", day);
114    (hr > 23) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", hr);
115    (min > 59) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", min);
116    (sec > 59) ? seq_puts(seq, "**\n") : seq_printf(seq, "%2.2u\n", sec);
117
118    return 0;
119}
120
121static int acpi_system_alarm_open_fs(struct inode *inode, struct file *file)
122{
123    return single_open(file, acpi_system_alarm_seq_show, PDE(inode)->data);
124}
125
126static int get_date_field(char **p, u32 * value)
127{
128    char *next = NULL;
129    char *string_end = NULL;
130    int result = -EINVAL;
131
132    /*
133     * Try to find delimeter, only to insert null. The end of the
134     * string won't have one, but is still valid.
135     */
136    if (*p == NULL)
137        return result;
138
139    next = strpbrk(*p, "- :");
140    if (next)
141        *next++ = '\0';
142
143    *value = simple_strtoul(*p, &string_end, 10);
144
145    /* Signal success if we got a good digit */
146    if (string_end != *p)
147        result = 0;
148
149    if (next)
150        *p = next;
151    else
152        *p = NULL;
153
154    return result;
155}
156
157/* Read a possibly BCD register, always return binary */
158static u32 cmos_bcd_read(int offset, int rtc_control)
159{
160    u32 val = CMOS_READ(offset);
161    if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
162        val = bcd2bin(val);
163    return val;
164}
165
166/* Write binary value into possibly BCD register */
167static void cmos_bcd_write(u32 val, int offset, int rtc_control)
168{
169    if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
170        val = bin2bcd(val);
171    CMOS_WRITE(val, offset);
172}
173
174static ssize_t
175acpi_system_write_alarm(struct file *file,
176            const char __user * buffer, size_t count, loff_t * ppos)
177{
178    int result = 0;
179    char alarm_string[30] = { '\0' };
180    char *p = alarm_string;
181    u32 sec, min, hr, day, mo, yr;
182    int adjust = 0;
183    unsigned char rtc_control = 0;
184
185    if (count > sizeof(alarm_string) - 1)
186        return -EINVAL;
187
188    if (copy_from_user(alarm_string, buffer, count))
189        return -EFAULT;
190
191    alarm_string[count] = '\0';
192
193    /* check for time adjustment */
194    if (alarm_string[0] == '+') {
195        p++;
196        adjust = 1;
197    }
198
199    if ((result = get_date_field(&p, &yr)))
200        goto end;
201    if ((result = get_date_field(&p, &mo)))
202        goto end;
203    if ((result = get_date_field(&p, &day)))
204        goto end;
205    if ((result = get_date_field(&p, &hr)))
206        goto end;
207    if ((result = get_date_field(&p, &min)))
208        goto end;
209    if ((result = get_date_field(&p, &sec)))
210        goto end;
211
212    spin_lock_irq(&rtc_lock);
213
214    rtc_control = CMOS_READ(RTC_CONTROL);
215
216    if (adjust) {
217        yr += cmos_bcd_read(RTC_YEAR, rtc_control);
218        mo += cmos_bcd_read(RTC_MONTH, rtc_control);
219        day += cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
220        hr += cmos_bcd_read(RTC_HOURS, rtc_control);
221        min += cmos_bcd_read(RTC_MINUTES, rtc_control);
222        sec += cmos_bcd_read(RTC_SECONDS, rtc_control);
223    }
224
225    spin_unlock_irq(&rtc_lock);
226
227    if (sec > 59) {
228        min += sec/60;
229        sec = sec%60;
230    }
231    if (min > 59) {
232        hr += min/60;
233        min = min%60;
234    }
235    if (hr > 23) {
236        day += hr/24;
237        hr = hr%24;
238    }
239    if (day > 31) {
240        mo += day/32;
241        day = day%32;
242    }
243    if (mo > 12) {
244        yr += mo/13;
245        mo = mo%13;
246    }
247
248    spin_lock_irq(&rtc_lock);
249    /*
250     * Disable alarm interrupt before setting alarm timer or else
251     * when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
252     */
253    rtc_control &= ~RTC_AIE;
254    CMOS_WRITE(rtc_control, RTC_CONTROL);
255    CMOS_READ(RTC_INTR_FLAGS);
256
257    /* write the fields the rtc knows about */
258    cmos_bcd_write(hr, RTC_HOURS_ALARM, rtc_control);
259    cmos_bcd_write(min, RTC_MINUTES_ALARM, rtc_control);
260    cmos_bcd_write(sec, RTC_SECONDS_ALARM, rtc_control);
261
262    /*
263     * If the system supports an enhanced alarm it will have non-zero
264     * offsets into the CMOS RAM here -- which for some reason are pointing
265     * to the RTC area of memory.
266     */
267    if (acpi_gbl_FADT.day_alarm)
268        cmos_bcd_write(day, acpi_gbl_FADT.day_alarm, rtc_control);
269    if (acpi_gbl_FADT.month_alarm)
270        cmos_bcd_write(mo, acpi_gbl_FADT.month_alarm, rtc_control);
271    if (acpi_gbl_FADT.century) {
272        if (adjust)
273            yr += cmos_bcd_read(acpi_gbl_FADT.century, rtc_control) * 100;
274        cmos_bcd_write(yr / 100, acpi_gbl_FADT.century, rtc_control);
275    }
276    /* enable the rtc alarm interrupt */
277    rtc_control |= RTC_AIE;
278    CMOS_WRITE(rtc_control, RTC_CONTROL);
279    CMOS_READ(RTC_INTR_FLAGS);
280
281    spin_unlock_irq(&rtc_lock);
282
283    acpi_clear_event(ACPI_EVENT_RTC);
284    acpi_enable_event(ACPI_EVENT_RTC, 0);
285
286    *ppos += count;
287
288    result = 0;
289      end:
290    return result ? result : count;
291}
292#endif /* HAVE_ACPI_LEGACY_ALARM */
293
294static int
295acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
296{
297    struct list_head *node, *next;
298
299    seq_printf(seq, "Device\tS-state\t Status Sysfs node\n");
300
301    mutex_lock(&acpi_device_lock);
302    list_for_each_safe(node, next, &acpi_wakeup_device_list) {
303        struct acpi_device *dev =
304            container_of(node, struct acpi_device, wakeup_list);
305        struct device *ldev;
306
307        if (!dev->wakeup.flags.valid)
308            continue;
309
310        ldev = acpi_get_physical_device(dev->handle);
311        seq_printf(seq, "%s\t S%d\t%c%-8s ",
312               dev->pnp.bus_id,
313               (u32) dev->wakeup.sleep_state,
314               dev->wakeup.flags.run_wake ? '*' : ' ',
315               (device_may_wakeup(&dev->dev)
316                 || (ldev && device_may_wakeup(ldev))) ?
317                   "enabled" : "disabled");
318        if (ldev)
319            seq_printf(seq, "%s:%s",
320                   ldev->bus ? ldev->bus->name : "no-bus",
321                   dev_name(ldev));
322        seq_printf(seq, "\n");
323        put_device(ldev);
324
325    }
326    mutex_unlock(&acpi_device_lock);
327    return 0;
328}
329
330static void physical_device_enable_wakeup(struct acpi_device *adev)
331{
332    struct device *dev = acpi_get_physical_device(adev->handle);
333
334    if (dev && device_can_wakeup(dev)) {
335        bool enable = !device_may_wakeup(dev);
336        device_set_wakeup_enable(dev, enable);
337    }
338}
339
340static ssize_t
341acpi_system_write_wakeup_device(struct file *file,
342                const char __user * buffer,
343                size_t count, loff_t * ppos)
344{
345    struct list_head *node, *next;
346    char strbuf[5];
347    char str[5] = "";
348    unsigned int len = count;
349
350    if (len > 4)
351        len = 4;
352    if (len < 0)
353        return -EFAULT;
354
355    if (copy_from_user(strbuf, buffer, len))
356        return -EFAULT;
357    strbuf[len] = '\0';
358    sscanf(strbuf, "%s", str);
359
360    mutex_lock(&acpi_device_lock);
361    list_for_each_safe(node, next, &acpi_wakeup_device_list) {
362        struct acpi_device *dev =
363            container_of(node, struct acpi_device, wakeup_list);
364        if (!dev->wakeup.flags.valid)
365            continue;
366
367        if (!strncmp(dev->pnp.bus_id, str, 4)) {
368            if (device_can_wakeup(&dev->dev)) {
369                bool enable = !device_may_wakeup(&dev->dev);
370                device_set_wakeup_enable(&dev->dev, enable);
371            } else {
372                physical_device_enable_wakeup(dev);
373            }
374            break;
375        }
376    }
377    mutex_unlock(&acpi_device_lock);
378    return count;
379}
380
381static int
382acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
383{
384    return single_open(file, acpi_system_wakeup_device_seq_show,
385               PDE(inode)->data);
386}
387
388static const struct file_operations acpi_system_wakeup_device_fops = {
389    .owner = THIS_MODULE,
390    .open = acpi_system_wakeup_device_open_fs,
391    .read = seq_read,
392    .write = acpi_system_write_wakeup_device,
393    .llseek = seq_lseek,
394    .release = single_release,
395};
396
397#ifdef HAVE_ACPI_LEGACY_ALARM
398static const struct file_operations acpi_system_alarm_fops = {
399    .owner = THIS_MODULE,
400    .open = acpi_system_alarm_open_fs,
401    .read = seq_read,
402    .write = acpi_system_write_alarm,
403    .llseek = seq_lseek,
404    .release = single_release,
405};
406
407static u32 rtc_handler(void *context)
408{
409    acpi_clear_event(ACPI_EVENT_RTC);
410    acpi_disable_event(ACPI_EVENT_RTC, 0);
411
412    return ACPI_INTERRUPT_HANDLED;
413}
414#endif /* HAVE_ACPI_LEGACY_ALARM */
415
416int __init acpi_sleep_proc_init(void)
417{
418#ifdef HAVE_ACPI_LEGACY_ALARM
419    /* 'alarm' [R/W] */
420    proc_create("alarm", S_IFREG | S_IRUGO | S_IWUSR,
421            acpi_root_dir, &acpi_system_alarm_fops);
422
423    acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
424    /*
425     * Disable the RTC event after installing RTC handler.
426     * Only when RTC alarm is set will it be enabled.
427     */
428    acpi_clear_event(ACPI_EVENT_RTC);
429    acpi_disable_event(ACPI_EVENT_RTC, 0);
430#endif /* HAVE_ACPI_LEGACY_ALARM */
431
432    /* 'wakeup device' [R/W] */
433    proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
434            acpi_root_dir, &acpi_system_wakeup_device_fops);
435
436    return 0;
437}
438

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