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0146f261 FT |
1 | /* |
2 | * rtc-mrst.c: Driver for Moorestown virtual RTC | |
3 | * | |
4 | * (C) Copyright 2009 Intel Corporation | |
5 | * Author: Jacob Pan (jacob.jun.pan@intel.com) | |
6 | * Feng Tang (feng.tang@intel.com) | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; version 2 | |
11 | * of the License. | |
12 | * | |
13 | * Note: | |
14 | * VRTC is emulated by system controller firmware, the real HW | |
15 | * RTC is located in the PMIC device. SCU FW shadows PMIC RTC | |
16 | * in a memory mapped IO space that is visible to the host IA | |
17 | * processor. | |
18 | * | |
19 | * This driver is based upon drivers/rtc/rtc-cmos.c | |
20 | */ | |
21 | ||
22 | /* | |
23 | * Note: | |
24 | * * vRTC only supports binary mode and 24H mode | |
25 | * * vRTC only support PIE and AIE, no UIE, and its PIE only happens | |
26 | * at 23:59:59pm everyday, no support for adjustable frequency | |
27 | * * Alarm function is also limited to hr/min/sec. | |
28 | */ | |
29 | ||
30 | #include <linux/mod_devicetable.h> | |
31 | #include <linux/platform_device.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/sfi.h> | |
38 | ||
39 | #include <asm-generic/rtc.h> | |
40 | #include <asm/intel_scu_ipc.h> | |
41 | #include <asm/mrst.h> | |
42 | #include <asm/mrst-vrtc.h> | |
43 | ||
44 | struct mrst_rtc { | |
45 | struct rtc_device *rtc; | |
46 | struct device *dev; | |
47 | int irq; | |
48 | struct resource *iomem; | |
49 | ||
50 | u8 enabled_wake; | |
51 | u8 suspend_ctrl; | |
52 | }; | |
53 | ||
54 | static const char driver_name[] = "rtc_mrst"; | |
55 | ||
56 | #define RTC_IRQMASK (RTC_PF | RTC_AF) | |
57 | ||
58 | static inline int is_intr(u8 rtc_intr) | |
59 | { | |
60 | if (!(rtc_intr & RTC_IRQF)) | |
61 | return 0; | |
62 | return rtc_intr & RTC_IRQMASK; | |
63 | } | |
64 | ||
168202c7 FT |
65 | static inline unsigned char vrtc_is_updating(void) |
66 | { | |
67 | unsigned char uip; | |
68 | unsigned long flags; | |
69 | ||
70 | spin_lock_irqsave(&rtc_lock, flags); | |
71 | uip = (vrtc_cmos_read(RTC_FREQ_SELECT) & RTC_UIP); | |
72 | spin_unlock_irqrestore(&rtc_lock, flags); | |
73 | return uip; | |
74 | } | |
75 | ||
0146f261 FT |
76 | /* |
77 | * rtc_time's year contains the increment over 1900, but vRTC's YEAR | |
78 | * register can't be programmed to value larger than 0x64, so vRTC | |
79 | * driver chose to use 1960 (1970 is UNIX time start point) as the base, | |
d3e1884b FT |
80 | * and does the translation at read/write time. |
81 | * | |
82 | * Why not just use 1970 as the offset? it's because using 1960 will | |
83 | * make it consistent in leap year setting for both vrtc and low-level | |
84 | * physical rtc devices. | |
0146f261 FT |
85 | */ |
86 | static int mrst_read_time(struct device *dev, struct rtc_time *time) | |
87 | { | |
88 | unsigned long flags; | |
89 | ||
168202c7 | 90 | if (vrtc_is_updating()) |
0146f261 FT |
91 | mdelay(20); |
92 | ||
93 | spin_lock_irqsave(&rtc_lock, flags); | |
94 | time->tm_sec = vrtc_cmos_read(RTC_SECONDS); | |
95 | time->tm_min = vrtc_cmos_read(RTC_MINUTES); | |
96 | time->tm_hour = vrtc_cmos_read(RTC_HOURS); | |
97 | time->tm_mday = vrtc_cmos_read(RTC_DAY_OF_MONTH); | |
98 | time->tm_mon = vrtc_cmos_read(RTC_MONTH); | |
99 | time->tm_year = vrtc_cmos_read(RTC_YEAR); | |
100 | spin_unlock_irqrestore(&rtc_lock, flags); | |
101 | ||
102 | /* Adjust for the 1960/1900 */ | |
103 | time->tm_year += 60; | |
104 | time->tm_mon--; | |
105 | return RTC_24H; | |
106 | } | |
107 | ||
108 | static int mrst_set_time(struct device *dev, struct rtc_time *time) | |
109 | { | |
110 | int ret; | |
111 | unsigned long flags; | |
112 | unsigned char mon, day, hrs, min, sec; | |
113 | unsigned int yrs; | |
114 | ||
115 | yrs = time->tm_year; | |
116 | mon = time->tm_mon + 1; /* tm_mon starts at zero */ | |
117 | day = time->tm_mday; | |
118 | hrs = time->tm_hour; | |
119 | min = time->tm_min; | |
120 | sec = time->tm_sec; | |
121 | ||
122 | if (yrs < 70 || yrs > 138) | |
123 | return -EINVAL; | |
124 | yrs -= 60; | |
125 | ||
126 | spin_lock_irqsave(&rtc_lock, flags); | |
127 | ||
128 | vrtc_cmos_write(yrs, RTC_YEAR); | |
129 | vrtc_cmos_write(mon, RTC_MONTH); | |
130 | vrtc_cmos_write(day, RTC_DAY_OF_MONTH); | |
131 | vrtc_cmos_write(hrs, RTC_HOURS); | |
132 | vrtc_cmos_write(min, RTC_MINUTES); | |
133 | vrtc_cmos_write(sec, RTC_SECONDS); | |
134 | ||
135 | spin_unlock_irqrestore(&rtc_lock, flags); | |
136 | ||
137 | ret = intel_scu_ipc_simple_command(IPCMSG_VRTC, IPC_CMD_VRTC_SETTIME); | |
138 | return ret; | |
139 | } | |
140 | ||
141 | static int mrst_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
142 | { | |
143 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | |
144 | unsigned char rtc_control; | |
145 | ||
146 | if (mrst->irq <= 0) | |
147 | return -EIO; | |
148 | ||
149 | /* Basic alarms only support hour, minute, and seconds fields. | |
150 | * Some also support day and month, for alarms up to a year in | |
151 | * the future. | |
152 | */ | |
153 | t->time.tm_mday = -1; | |
154 | t->time.tm_mon = -1; | |
155 | t->time.tm_year = -1; | |
156 | ||
157 | /* vRTC only supports binary mode */ | |
158 | spin_lock_irq(&rtc_lock); | |
159 | t->time.tm_sec = vrtc_cmos_read(RTC_SECONDS_ALARM); | |
160 | t->time.tm_min = vrtc_cmos_read(RTC_MINUTES_ALARM); | |
161 | t->time.tm_hour = vrtc_cmos_read(RTC_HOURS_ALARM); | |
162 | ||
163 | rtc_control = vrtc_cmos_read(RTC_CONTROL); | |
164 | spin_unlock_irq(&rtc_lock); | |
165 | ||
166 | t->enabled = !!(rtc_control & RTC_AIE); | |
167 | t->pending = 0; | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | static void mrst_checkintr(struct mrst_rtc *mrst, unsigned char rtc_control) | |
173 | { | |
174 | unsigned char rtc_intr; | |
175 | ||
176 | /* | |
177 | * NOTE after changing RTC_xIE bits we always read INTR_FLAGS; | |
178 | * allegedly some older rtcs need that to handle irqs properly | |
179 | */ | |
180 | rtc_intr = vrtc_cmos_read(RTC_INTR_FLAGS); | |
181 | rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF; | |
182 | if (is_intr(rtc_intr)) | |
183 | rtc_update_irq(mrst->rtc, 1, rtc_intr); | |
184 | } | |
185 | ||
186 | static void mrst_irq_enable(struct mrst_rtc *mrst, unsigned char mask) | |
187 | { | |
188 | unsigned char rtc_control; | |
189 | ||
190 | /* | |
191 | * Flush any pending IRQ status, notably for update irqs, | |
192 | * before we enable new IRQs | |
193 | */ | |
194 | rtc_control = vrtc_cmos_read(RTC_CONTROL); | |
195 | mrst_checkintr(mrst, rtc_control); | |
196 | ||
197 | rtc_control |= mask; | |
198 | vrtc_cmos_write(rtc_control, RTC_CONTROL); | |
199 | ||
200 | mrst_checkintr(mrst, rtc_control); | |
201 | } | |
202 | ||
203 | static void mrst_irq_disable(struct mrst_rtc *mrst, unsigned char mask) | |
204 | { | |
205 | unsigned char rtc_control; | |
206 | ||
207 | rtc_control = vrtc_cmos_read(RTC_CONTROL); | |
208 | rtc_control &= ~mask; | |
209 | vrtc_cmos_write(rtc_control, RTC_CONTROL); | |
210 | mrst_checkintr(mrst, rtc_control); | |
211 | } | |
212 | ||
213 | static int mrst_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
214 | { | |
215 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | |
216 | unsigned char hrs, min, sec; | |
217 | int ret = 0; | |
218 | ||
219 | if (!mrst->irq) | |
220 | return -EIO; | |
221 | ||
222 | hrs = t->time.tm_hour; | |
223 | min = t->time.tm_min; | |
224 | sec = t->time.tm_sec; | |
225 | ||
226 | spin_lock_irq(&rtc_lock); | |
227 | /* Next rtc irq must not be from previous alarm setting */ | |
228 | mrst_irq_disable(mrst, RTC_AIE); | |
229 | ||
230 | /* Update alarm */ | |
231 | vrtc_cmos_write(hrs, RTC_HOURS_ALARM); | |
232 | vrtc_cmos_write(min, RTC_MINUTES_ALARM); | |
233 | vrtc_cmos_write(sec, RTC_SECONDS_ALARM); | |
234 | ||
235 | spin_unlock_irq(&rtc_lock); | |
236 | ||
237 | ret = intel_scu_ipc_simple_command(IPCMSG_VRTC, IPC_CMD_VRTC_SETALARM); | |
238 | if (ret) | |
239 | return ret; | |
240 | ||
241 | spin_lock_irq(&rtc_lock); | |
242 | if (t->enabled) | |
243 | mrst_irq_enable(mrst, RTC_AIE); | |
244 | ||
245 | spin_unlock_irq(&rtc_lock); | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
0146f261 | 250 | /* Currently, the vRTC doesn't support UIE ON/OFF */ |
16380c15 | 251 | static int mrst_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
0146f261 FT |
252 | { |
253 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | |
254 | unsigned long flags; | |
255 | ||
0146f261 | 256 | spin_lock_irqsave(&rtc_lock, flags); |
16380c15 | 257 | if (enabled) |
0146f261 | 258 | mrst_irq_enable(mrst, RTC_AIE); |
16380c15 JS |
259 | else |
260 | mrst_irq_disable(mrst, RTC_AIE); | |
0146f261 FT |
261 | spin_unlock_irqrestore(&rtc_lock, flags); |
262 | return 0; | |
263 | } | |
264 | ||
0146f261 FT |
265 | |
266 | #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) | |
267 | ||
268 | static int mrst_procfs(struct device *dev, struct seq_file *seq) | |
269 | { | |
270 | unsigned char rtc_control, valid; | |
271 | ||
272 | spin_lock_irq(&rtc_lock); | |
273 | rtc_control = vrtc_cmos_read(RTC_CONTROL); | |
274 | valid = vrtc_cmos_read(RTC_VALID); | |
275 | spin_unlock_irq(&rtc_lock); | |
276 | ||
277 | return seq_printf(seq, | |
278 | "periodic_IRQ\t: %s\n" | |
279 | "alarm\t\t: %s\n" | |
280 | "BCD\t\t: no\n" | |
281 | "periodic_freq\t: daily (not adjustable)\n", | |
282 | (rtc_control & RTC_PIE) ? "on" : "off", | |
283 | (rtc_control & RTC_AIE) ? "on" : "off"); | |
284 | } | |
285 | ||
286 | #else | |
287 | #define mrst_procfs NULL | |
288 | #endif | |
289 | ||
290 | static const struct rtc_class_ops mrst_rtc_ops = { | |
0146f261 FT |
291 | .read_time = mrst_read_time, |
292 | .set_time = mrst_set_time, | |
293 | .read_alarm = mrst_read_alarm, | |
294 | .set_alarm = mrst_set_alarm, | |
295 | .proc = mrst_procfs, | |
16380c15 | 296 | .alarm_irq_enable = mrst_rtc_alarm_irq_enable, |
0146f261 FT |
297 | }; |
298 | ||
299 | static struct mrst_rtc mrst_rtc; | |
300 | ||
301 | /* | |
302 | * When vRTC IRQ is captured by SCU FW, FW will clear the AIE bit in | |
303 | * Reg B, so no need for this driver to clear it | |
304 | */ | |
305 | static irqreturn_t mrst_rtc_irq(int irq, void *p) | |
306 | { | |
307 | u8 irqstat; | |
308 | ||
309 | spin_lock(&rtc_lock); | |
310 | /* This read will clear all IRQ flags inside Reg C */ | |
311 | irqstat = vrtc_cmos_read(RTC_INTR_FLAGS); | |
312 | spin_unlock(&rtc_lock); | |
313 | ||
314 | irqstat &= RTC_IRQMASK | RTC_IRQF; | |
315 | if (is_intr(irqstat)) { | |
316 | rtc_update_irq(p, 1, irqstat); | |
317 | return IRQ_HANDLED; | |
318 | } | |
319 | return IRQ_NONE; | |
320 | } | |
321 | ||
b3b896c7 | 322 | static int __devinit |
0146f261 FT |
323 | vrtc_mrst_do_probe(struct device *dev, struct resource *iomem, int rtc_irq) |
324 | { | |
325 | int retval = 0; | |
326 | unsigned char rtc_control; | |
327 | ||
328 | /* There can be only one ... */ | |
329 | if (mrst_rtc.dev) | |
330 | return -EBUSY; | |
331 | ||
332 | if (!iomem) | |
333 | return -ENODEV; | |
334 | ||
335 | iomem = request_mem_region(iomem->start, | |
336 | iomem->end + 1 - iomem->start, | |
337 | driver_name); | |
338 | if (!iomem) { | |
339 | dev_dbg(dev, "i/o mem already in use.\n"); | |
340 | return -EBUSY; | |
341 | } | |
342 | ||
343 | mrst_rtc.irq = rtc_irq; | |
344 | mrst_rtc.iomem = iomem; | |
de97a21a FT |
345 | mrst_rtc.dev = dev; |
346 | dev_set_drvdata(dev, &mrst_rtc); | |
0146f261 FT |
347 | |
348 | mrst_rtc.rtc = rtc_device_register(driver_name, dev, | |
349 | &mrst_rtc_ops, THIS_MODULE); | |
350 | if (IS_ERR(mrst_rtc.rtc)) { | |
351 | retval = PTR_ERR(mrst_rtc.rtc); | |
352 | goto cleanup0; | |
353 | } | |
354 | ||
0146f261 FT |
355 | rename_region(iomem, dev_name(&mrst_rtc.rtc->dev)); |
356 | ||
357 | spin_lock_irq(&rtc_lock); | |
358 | mrst_irq_disable(&mrst_rtc, RTC_PIE | RTC_AIE); | |
359 | rtc_control = vrtc_cmos_read(RTC_CONTROL); | |
360 | spin_unlock_irq(&rtc_lock); | |
361 | ||
362 | if (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY))) | |
363 | dev_dbg(dev, "TODO: support more than 24-hr BCD mode\n"); | |
364 | ||
365 | if (rtc_irq) { | |
366 | retval = request_irq(rtc_irq, mrst_rtc_irq, | |
367 | IRQF_DISABLED, dev_name(&mrst_rtc.rtc->dev), | |
368 | mrst_rtc.rtc); | |
369 | if (retval < 0) { | |
370 | dev_dbg(dev, "IRQ %d is already in use, err %d\n", | |
371 | rtc_irq, retval); | |
372 | goto cleanup1; | |
373 | } | |
374 | } | |
375 | dev_dbg(dev, "initialised\n"); | |
376 | return 0; | |
377 | ||
378 | cleanup1: | |
0146f261 FT |
379 | rtc_device_unregister(mrst_rtc.rtc); |
380 | cleanup0: | |
de97a21a FT |
381 | dev_set_drvdata(dev, NULL); |
382 | mrst_rtc.dev = NULL; | |
c258f9a0 | 383 | release_mem_region(iomem->start, resource_size(iomem)); |
0146f261 FT |
384 | dev_err(dev, "rtc-mrst: unable to initialise\n"); |
385 | return retval; | |
386 | } | |
387 | ||
388 | static void rtc_mrst_do_shutdown(void) | |
389 | { | |
390 | spin_lock_irq(&rtc_lock); | |
391 | mrst_irq_disable(&mrst_rtc, RTC_IRQMASK); | |
392 | spin_unlock_irq(&rtc_lock); | |
393 | } | |
394 | ||
b3b896c7 | 395 | static void __devexit rtc_mrst_do_remove(struct device *dev) |
0146f261 FT |
396 | { |
397 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | |
398 | struct resource *iomem; | |
399 | ||
400 | rtc_mrst_do_shutdown(); | |
401 | ||
402 | if (mrst->irq) | |
403 | free_irq(mrst->irq, mrst->rtc); | |
404 | ||
405 | rtc_device_unregister(mrst->rtc); | |
406 | mrst->rtc = NULL; | |
407 | ||
408 | iomem = mrst->iomem; | |
c258f9a0 | 409 | release_mem_region(iomem->start, resource_size(iomem)); |
0146f261 FT |
410 | mrst->iomem = NULL; |
411 | ||
412 | mrst->dev = NULL; | |
413 | dev_set_drvdata(dev, NULL); | |
414 | } | |
415 | ||
416 | #ifdef CONFIG_PM | |
417 | static int mrst_suspend(struct device *dev, pm_message_t mesg) | |
418 | { | |
419 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | |
420 | unsigned char tmp; | |
421 | ||
422 | /* Only the alarm might be a wakeup event source */ | |
423 | spin_lock_irq(&rtc_lock); | |
424 | mrst->suspend_ctrl = tmp = vrtc_cmos_read(RTC_CONTROL); | |
425 | if (tmp & (RTC_PIE | RTC_AIE)) { | |
426 | unsigned char mask; | |
427 | ||
428 | if (device_may_wakeup(dev)) | |
429 | mask = RTC_IRQMASK & ~RTC_AIE; | |
430 | else | |
431 | mask = RTC_IRQMASK; | |
432 | tmp &= ~mask; | |
433 | vrtc_cmos_write(tmp, RTC_CONTROL); | |
434 | ||
435 | mrst_checkintr(mrst, tmp); | |
436 | } | |
437 | spin_unlock_irq(&rtc_lock); | |
438 | ||
439 | if (tmp & RTC_AIE) { | |
440 | mrst->enabled_wake = 1; | |
441 | enable_irq_wake(mrst->irq); | |
442 | } | |
443 | ||
444 | dev_dbg(&mrst_rtc.rtc->dev, "suspend%s, ctrl %02x\n", | |
445 | (tmp & RTC_AIE) ? ", alarm may wake" : "", | |
446 | tmp); | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | /* | |
452 | * We want RTC alarms to wake us from the deep power saving state | |
453 | */ | |
454 | static inline int mrst_poweroff(struct device *dev) | |
455 | { | |
456 | return mrst_suspend(dev, PMSG_HIBERNATE); | |
457 | } | |
458 | ||
459 | static int mrst_resume(struct device *dev) | |
460 | { | |
461 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | |
462 | unsigned char tmp = mrst->suspend_ctrl; | |
463 | ||
464 | /* Re-enable any irqs previously active */ | |
465 | if (tmp & RTC_IRQMASK) { | |
466 | unsigned char mask; | |
467 | ||
468 | if (mrst->enabled_wake) { | |
469 | disable_irq_wake(mrst->irq); | |
470 | mrst->enabled_wake = 0; | |
471 | } | |
472 | ||
473 | spin_lock_irq(&rtc_lock); | |
474 | do { | |
475 | vrtc_cmos_write(tmp, RTC_CONTROL); | |
476 | ||
477 | mask = vrtc_cmos_read(RTC_INTR_FLAGS); | |
478 | mask &= (tmp & RTC_IRQMASK) | RTC_IRQF; | |
479 | if (!is_intr(mask)) | |
480 | break; | |
481 | ||
482 | rtc_update_irq(mrst->rtc, 1, mask); | |
483 | tmp &= ~RTC_AIE; | |
484 | } while (mask & RTC_AIE); | |
485 | spin_unlock_irq(&rtc_lock); | |
486 | } | |
487 | ||
488 | dev_dbg(&mrst_rtc.rtc->dev, "resume, ctrl %02x\n", tmp); | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
493 | #else | |
494 | #define mrst_suspend NULL | |
495 | #define mrst_resume NULL | |
496 | ||
497 | static inline int mrst_poweroff(struct device *dev) | |
498 | { | |
499 | return -ENOSYS; | |
500 | } | |
501 | ||
502 | #endif | |
503 | ||
b3b896c7 | 504 | static int __devinit vrtc_mrst_platform_probe(struct platform_device *pdev) |
0146f261 FT |
505 | { |
506 | return vrtc_mrst_do_probe(&pdev->dev, | |
507 | platform_get_resource(pdev, IORESOURCE_MEM, 0), | |
508 | platform_get_irq(pdev, 0)); | |
509 | } | |
510 | ||
b3b896c7 | 511 | static int __devexit vrtc_mrst_platform_remove(struct platform_device *pdev) |
0146f261 FT |
512 | { |
513 | rtc_mrst_do_remove(&pdev->dev); | |
514 | return 0; | |
515 | } | |
516 | ||
517 | static void vrtc_mrst_platform_shutdown(struct platform_device *pdev) | |
518 | { | |
519 | if (system_state == SYSTEM_POWER_OFF && !mrst_poweroff(&pdev->dev)) | |
520 | return; | |
521 | ||
522 | rtc_mrst_do_shutdown(); | |
523 | } | |
524 | ||
525 | MODULE_ALIAS("platform:vrtc_mrst"); | |
526 | ||
527 | static struct platform_driver vrtc_mrst_platform_driver = { | |
528 | .probe = vrtc_mrst_platform_probe, | |
b3b896c7 | 529 | .remove = __devexit_p(vrtc_mrst_platform_remove), |
0146f261 FT |
530 | .shutdown = vrtc_mrst_platform_shutdown, |
531 | .driver = { | |
532 | .name = (char *) driver_name, | |
533 | .suspend = mrst_suspend, | |
534 | .resume = mrst_resume, | |
535 | } | |
536 | }; | |
537 | ||
538 | static int __init vrtc_mrst_init(void) | |
539 | { | |
540 | return platform_driver_register(&vrtc_mrst_platform_driver); | |
541 | } | |
542 | ||
543 | static void __exit vrtc_mrst_exit(void) | |
544 | { | |
545 | platform_driver_unregister(&vrtc_mrst_platform_driver); | |
546 | } | |
547 | ||
548 | module_init(vrtc_mrst_init); | |
549 | module_exit(vrtc_mrst_exit); | |
550 | ||
551 | MODULE_AUTHOR("Jacob Pan; Feng Tang"); | |
552 | MODULE_DESCRIPTION("Driver for Moorestown virtual RTC"); | |
553 | MODULE_LICENSE("GPL"); |