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30#include <linux/types.h>
31#include <linux/errno.h>
32#include <linux/miscdevice.h>
33#include <linux/init.h>
34#include <linux/rtc.h>
35#include <linux/proc_fs.h>
36#include <linux/seq_file.h>
37#include <linux/efi.h>
38#include <linux/uaccess.h>
39
40
41#define EFI_RTC_VERSION "0.4"
42
43#define EFI_ISDST (EFI_TIME_ADJUST_DAYLIGHT|EFI_TIME_IN_DAYLIGHT)
44
45
46
47#define EFI_RTC_EPOCH 1998
48
49static DEFINE_SPINLOCK(efi_rtc_lock);
50
51static long efi_rtc_ioctl(struct file *file, unsigned int cmd,
52 unsigned long arg);
53
54#define is_leap(year) \
55 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
56
57static const unsigned short int __mon_yday[2][13] =
58{
59
60 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
61
62 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
63};
64
65
66
67
68static inline int
69compute_yday(efi_time_t *eft)
70{
71
72 return __mon_yday[is_leap(eft->year)][eft->month-1]+ eft->day -1;
73}
74
75
76
77
78
79static int
80compute_wday(efi_time_t *eft)
81{
82 int y;
83 int ndays = 0;
84
85 if ( eft->year < 1998 ) {
86 printk(KERN_ERR "efirtc: EFI year < 1998, invalid date\n");
87 return -1;
88 }
89
90 for(y=EFI_RTC_EPOCH; y < eft->year; y++ ) {
91 ndays += 365 + (is_leap(y) ? 1 : 0);
92 }
93 ndays += compute_yday(eft);
94
95
96
97
98 return (ndays + 4) % 7;
99}
100
101static void
102convert_to_efi_time(struct rtc_time *wtime, efi_time_t *eft)
103{
104
105 eft->year = wtime->tm_year + 1900;
106 eft->month = wtime->tm_mon + 1;
107 eft->day = wtime->tm_mday;
108 eft->hour = wtime->tm_hour;
109 eft->minute = wtime->tm_min;
110 eft->second = wtime->tm_sec;
111 eft->nanosecond = 0;
112 eft->daylight = wtime->tm_isdst ? EFI_ISDST: 0;
113 eft->timezone = EFI_UNSPECIFIED_TIMEZONE;
114}
115
116static void
117convert_from_efi_time(efi_time_t *eft, struct rtc_time *wtime)
118{
119 memset(wtime, 0, sizeof(*wtime));
120 wtime->tm_sec = eft->second;
121 wtime->tm_min = eft->minute;
122 wtime->tm_hour = eft->hour;
123 wtime->tm_mday = eft->day;
124 wtime->tm_mon = eft->month - 1;
125 wtime->tm_year = eft->year - 1900;
126
127
128 wtime->tm_wday = compute_wday(eft);
129
130
131 wtime->tm_yday = compute_yday(eft);
132
133
134 switch (eft->daylight & EFI_ISDST) {
135 case EFI_ISDST:
136 wtime->tm_isdst = 1;
137 break;
138 case EFI_TIME_ADJUST_DAYLIGHT:
139 wtime->tm_isdst = 0;
140 break;
141 default:
142 wtime->tm_isdst = -1;
143 }
144}
145
146static long efi_rtc_ioctl(struct file *file, unsigned int cmd,
147 unsigned long arg)
148{
149
150 efi_status_t status;
151 unsigned long flags;
152 efi_time_t eft;
153 efi_time_cap_t cap;
154 struct rtc_time wtime;
155 struct rtc_wkalrm __user *ewp;
156 unsigned char enabled, pending;
157
158 switch (cmd) {
159 case RTC_UIE_ON:
160 case RTC_UIE_OFF:
161 case RTC_PIE_ON:
162 case RTC_PIE_OFF:
163 case RTC_AIE_ON:
164 case RTC_AIE_OFF:
165 case RTC_ALM_SET:
166 case RTC_ALM_READ:
167 case RTC_IRQP_READ:
168 case RTC_IRQP_SET:
169 case RTC_EPOCH_READ:
170 case RTC_EPOCH_SET:
171 return -EINVAL;
172
173 case RTC_RD_TIME:
174 spin_lock_irqsave(&efi_rtc_lock, flags);
175
176 status = efi.get_time(&eft, &cap);
177
178 spin_unlock_irqrestore(&efi_rtc_lock,flags);
179
180 if (status != EFI_SUCCESS) {
181
182 printk(KERN_ERR "efitime: can't read time\n");
183 return -EINVAL;
184 }
185
186 convert_from_efi_time(&eft, &wtime);
187
188 return copy_to_user((void __user *)arg, &wtime,
189 sizeof (struct rtc_time)) ? - EFAULT : 0;
190
191 case RTC_SET_TIME:
192
193 if (!capable(CAP_SYS_TIME)) return -EACCES;
194
195 if (copy_from_user(&wtime, (struct rtc_time __user *)arg,
196 sizeof(struct rtc_time)) )
197 return -EFAULT;
198
199 convert_to_efi_time(&wtime, &eft);
200
201 spin_lock_irqsave(&efi_rtc_lock, flags);
202
203 status = efi.set_time(&eft);
204
205 spin_unlock_irqrestore(&efi_rtc_lock,flags);
206
207 return status == EFI_SUCCESS ? 0 : -EINVAL;
208
209 case RTC_WKALM_SET:
210
211 if (!capable(CAP_SYS_TIME)) return -EACCES;
212
213 ewp = (struct rtc_wkalrm __user *)arg;
214
215 if ( get_user(enabled, &ewp->enabled)
216 || copy_from_user(&wtime, &ewp->time, sizeof(struct rtc_time)) )
217 return -EFAULT;
218
219 convert_to_efi_time(&wtime, &eft);
220
221 spin_lock_irqsave(&efi_rtc_lock, flags);
222
223
224
225
226
227
228 status = efi.set_wakeup_time((efi_bool_t)enabled, &eft);
229
230 spin_unlock_irqrestore(&efi_rtc_lock,flags);
231
232 return status == EFI_SUCCESS ? 0 : -EINVAL;
233
234 case RTC_WKALM_RD:
235
236 spin_lock_irqsave(&efi_rtc_lock, flags);
237
238 status = efi.get_wakeup_time((efi_bool_t *)&enabled, (efi_bool_t *)&pending, &eft);
239
240 spin_unlock_irqrestore(&efi_rtc_lock,flags);
241
242 if (status != EFI_SUCCESS) return -EINVAL;
243
244 ewp = (struct rtc_wkalrm __user *)arg;
245
246 if ( put_user(enabled, &ewp->enabled)
247 || put_user(pending, &ewp->pending)) return -EFAULT;
248
249 convert_from_efi_time(&eft, &wtime);
250
251 return copy_to_user(&ewp->time, &wtime,
252 sizeof(struct rtc_time)) ? -EFAULT : 0;
253 }
254 return -ENOTTY;
255}
256
257
258
259
260
261
262
263static int efi_rtc_open(struct inode *inode, struct file *file)
264{
265
266
267
268
269
270 return 0;
271}
272
273static int efi_rtc_close(struct inode *inode, struct file *file)
274{
275 return 0;
276}
277
278
279
280
281
282static const struct file_operations efi_rtc_fops = {
283 .owner = THIS_MODULE,
284 .unlocked_ioctl = efi_rtc_ioctl,
285 .open = efi_rtc_open,
286 .release = efi_rtc_close,
287 .llseek = no_llseek,
288};
289
290static struct miscdevice efi_rtc_dev= {
291 EFI_RTC_MINOR,
292 "efirtc",
293 &efi_rtc_fops
294};
295
296
297
298
299static int efi_rtc_proc_show(struct seq_file *m, void *v)
300{
301 efi_time_t eft, alm;
302 efi_time_cap_t cap;
303 efi_bool_t enabled, pending;
304 unsigned long flags;
305
306 memset(&eft, 0, sizeof(eft));
307 memset(&alm, 0, sizeof(alm));
308 memset(&cap, 0, sizeof(cap));
309
310 spin_lock_irqsave(&efi_rtc_lock, flags);
311
312 efi.get_time(&eft, &cap);
313 efi.get_wakeup_time(&enabled, &pending, &alm);
314
315 spin_unlock_irqrestore(&efi_rtc_lock,flags);
316
317 seq_printf(m,
318 "Time : %u:%u:%u.%09u\n"
319 "Date : %u-%u-%u\n"
320 "Daylight : %u\n",
321 eft.hour, eft.minute, eft.second, eft.nanosecond,
322 eft.year, eft.month, eft.day,
323 eft.daylight);
324
325 if (eft.timezone == EFI_UNSPECIFIED_TIMEZONE)
326 seq_puts(m, "Timezone : unspecified\n");
327 else
328
329 seq_printf(m, "Timezone : %u\n", eft.timezone);
330
331
332 seq_printf(m,
333 "Alarm Time : %u:%u:%u.%09u\n"
334 "Alarm Date : %u-%u-%u\n"
335 "Alarm Daylight : %u\n"
336 "Enabled : %s\n"
337 "Pending : %s\n",
338 alm.hour, alm.minute, alm.second, alm.nanosecond,
339 alm.year, alm.month, alm.day,
340 alm.daylight,
341 enabled == 1 ? "yes" : "no",
342 pending == 1 ? "yes" : "no");
343
344 if (eft.timezone == EFI_UNSPECIFIED_TIMEZONE)
345 seq_puts(m, "Timezone : unspecified\n");
346 else
347
348 seq_printf(m, "Timezone : %u\n", alm.timezone);
349
350
351
352
353 seq_printf(m,
354 "Resolution : %u\n"
355 "Accuracy : %u\n"
356 "SetstoZero : %u\n",
357 cap.resolution, cap.accuracy, cap.sets_to_zero);
358
359 return 0;
360}
361
362static int efi_rtc_proc_open(struct inode *inode, struct file *file)
363{
364 return single_open(file, efi_rtc_proc_show, NULL);
365}
366
367static const struct file_operations efi_rtc_proc_fops = {
368 .open = efi_rtc_proc_open,
369 .read = seq_read,
370 .llseek = seq_lseek,
371 .release = single_release,
372};
373
374static int __init
375efi_rtc_init(void)
376{
377 int ret;
378 struct proc_dir_entry *dir;
379
380 printk(KERN_INFO "EFI Time Services Driver v%s\n", EFI_RTC_VERSION);
381
382 ret = misc_register(&efi_rtc_dev);
383 if (ret) {
384 printk(KERN_ERR "efirtc: can't misc_register on minor=%d\n",
385 EFI_RTC_MINOR);
386 return ret;
387 }
388
389 dir = proc_create("driver/efirtc", 0, NULL, &efi_rtc_proc_fops);
390 if (dir == NULL) {
391 printk(KERN_ERR "efirtc: can't create /proc/driver/efirtc.\n");
392 misc_deregister(&efi_rtc_dev);
393 return -1;
394 }
395 return 0;
396}
397device_initcall(efi_rtc_init);
398
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401
402
