aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/ide/legacy/macide.c
blob: 90cac609d9cf1dba22def43eabd04e90e67811e1 (plain) (tree)


























































































































































                                                                                                     
/*
 *  linux/drivers/ide/legacy/macide.c -- Macintosh IDE Driver
 *
 *     Copyright (C) 1998 by Michael Schmitz
 *
 *  This driver was written based on information obtained from the MacOS IDE
 *  driver binary by Mikael Forselius
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */

#include <linux/config.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/delay.h>
#include <linux/ide.h>

#include <asm/machw.h>
#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_baboon.h>

#define IDE_BASE 0x50F1A000	/* Base address of IDE controller */

/*
 * Generic IDE registers as offsets from the base
 * These match MkLinux so they should be correct.
 */

#define IDE_DATA	0x00
#define IDE_ERROR	0x04	/* see err-bits */
#define IDE_NSECTOR	0x08	/* nr of sectors to read/write */
#define IDE_SECTOR	0x0c	/* starting sector */
#define IDE_LCYL	0x10	/* starting cylinder */
#define IDE_HCYL	0x14	/* high byte of starting cyl */
#define IDE_SELECT	0x18	/* 101dhhhh , d=drive, hhhh=head */
#define IDE_STATUS	0x1c	/* see status-bits */
#define IDE_CONTROL	0x38	/* control/altstatus */

/*
 * Mac-specific registers
 */

/*
 * this register is odd; it doesn't seem to do much and it's
 * not word-aligned like virtually every other hardware register
 * on the Mac...
 */

#define IDE_IFR		0x101	/* (0x101) IDE interrupt flags on Quadra:
				 *
				 * Bit 0+1: some interrupt flags
				 * Bit 2+3: some interrupt enable
				 * Bit 4:   ??
				 * Bit 5:   IDE interrupt flag (any hwif)
				 * Bit 6:   maybe IDE interrupt enable (any hwif) ??
				 * Bit 7:   Any interrupt condition
				 */

volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);

static int macide_offsets[IDE_NR_PORTS] = {
    IDE_DATA, IDE_ERROR,  IDE_NSECTOR, IDE_SECTOR, IDE_LCYL,
    IDE_HCYL, IDE_SELECT, IDE_STATUS,  IDE_CONTROL
};

int macide_ack_intr(ide_hwif_t* hwif)
{
	if (*ide_ifr & 0x20) {
		*ide_ifr &= ~0x20;
		return 1;
	}
	return 0;
}

#ifdef CONFIG_BLK_DEV_MAC_MEDIABAY
static void macide_mediabay_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	int state = baboon->mb_status & 0x04;

	printk(KERN_INFO "macide: media bay %s detected\n", state? "removal":"insertion");
}
#endif

/*
 * Probe for a Macintosh IDE interface
 */

void macide_init(void)
{
	hw_regs_t hw;
	ide_hwif_t *hwif;
	int index = -1;

	switch (macintosh_config->ide_type) {
	case MAC_IDE_QUADRA:
		ide_setup_ports(&hw, IDE_BASE, macide_offsets,
				0, 0, macide_ack_intr,
//				quadra_ide_iops,
				IRQ_NUBUS_F);
		index = ide_register_hw(&hw, &hwif);
		break;
	case MAC_IDE_PB:
		ide_setup_ports(&hw, IDE_BASE, macide_offsets,
				0, 0, macide_ack_intr,
//				macide_pb_iops,
				IRQ_NUBUS_C);
		index = ide_register_hw(&hw, &hwif);
		break;
	case MAC_IDE_BABOON:
		ide_setup_ports(&hw, BABOON_BASE, macide_offsets,
				0, 0, NULL,
//				macide_baboon_iops,
				IRQ_BABOON_1);
		index = ide_register_hw(&hw, &hwif);
		if (index == -1) break;
		if (macintosh_config->ident == MAC_MODEL_PB190) {

			/* Fix breakage in ide-disk.c: drive capacity	*/
			/* is not initialized for drives without a 	*/
			/* hardware ID, and we can't get that without	*/
			/* probing the drive which freezes a 190.	*/

			ide_drive_t *drive = &ide_hwifs[index].drives[0];
			drive->capacity64 = drive->cyl*drive->head*drive->sect;

#ifdef CONFIG_BLK_DEV_MAC_MEDIABAY
			request_irq(IRQ_BABOON_2, macide_mediabay_interrupt,
					IRQ_FLG_FAST, "mediabay",
					macide_mediabay_interrupt);
#endif
		}
		break;

	default:
	    return;
	}

        if (index != -1) {
		hwif->mmio = 2;
		if (macintosh_config->ide_type == MAC_IDE_QUADRA)
			printk(KERN_INFO "ide%d: Macintosh Quadra IDE interface\n", index);
		else if (macintosh_config->ide_type == MAC_IDE_PB)
			printk(KERN_INFO "ide%d: Macintosh Powerbook IDE interface\n", index);
		else if (macintosh_config->ide_type == MAC_IDE_BABOON)
			printk(KERN_INFO "ide%d: Macintosh Powerbook Baboon IDE interface\n", index);
		else
			printk(KERN_INFO "ide%d: Unknown Macintosh IDE interface\n", index);
	}
}
mmitter Linus Torvalds <torvalds@woody.linux-foundation.org> 2007-10-16 12:43:13 -0400 rtc-dev: no need to convert file->private_data to rtc device' href='/cgit/cgit.cgi/litmus-rt.git/commit/drivers/rtc/rtc-dev.c?h=tracing-devel&id=88efe137394f58fb5893013e123e4bcf444fd44b'>88efe137394f
e824290e5dcf




3418ff76119d
e824290e5dcf






























cd9662094edf
3418ff76119d








e824290e5dcf





88efe137394f
e824290e5dcf








5ad31a575157
e824290e5dcf


ab6a2d70d18e
ff8371ac9a5a
e824290e5dcf



5ad31a575157

b68bb2632453
5ad31a575157
2601a46474db
110d693d5898






5ad31a575157
110d693d5898



5ad31a575157
110d693d5898


9d013d3b14f4

5ad31a575157
110d693d5898


5ad31a575157


e824290e5dcf

cd9662094edf
5ad31a575157

e824290e5dcf
5ad31a575157
e824290e5dcf



b3969e5831ad
8a0bdfd7a05f








e824290e5dcf



5ad31a575157

ab6a2d70d18e
e824290e5dcf



5ad31a575157

e824290e5dcf

5ad31a575157

e824290e5dcf




e824290e5dcf


f8245c26886c






































5ad31a575157
e824290e5dcf

5ad31a575157

ab6a2d70d18e
e824290e5dcf



5ad31a575157

e824290e5dcf

5ad31a575157

e824290e5dcf


5ad31a575157
2601a46474db
d691eb901e04





2601a46474db

099e657625e8















2601a46474db
d691eb901e04




2601a46474db

e824290e5dcf









e824290e5dcf









5ad31a575157
e824290e5dcf


5ad31a575157
e824290e5dcf

5ad31a575157
ab6a2d70d18e
e824290e5dcf



5ad31a575157

e824290e5dcf

b3969e5831ad
e824290e5dcf


5ad31a575157

e824290e5dcf


2e4a75cdcb89





e824290e5dcf

88efe137394f
e824290e5dcf
743e6a504f81







099e657625e8

743e6a504f81
099e657625e8
5cdc98b8f513

e824290e5dcf
cd9662094edf
e824290e5dcf
372a302e9a89
e824290e5dcf


d54b1fdb1d9f
e824290e5dcf



5ad31a575157
e824290e5dcf






cb3a58d2acc0
e824290e5dcf
5726fb2012f0

e824290e5dcf

5726fb2012f0

e824290e5dcf

cd9662094edf
5726fb2012f0
655066c3835e
c4028958b6ec
655066c3835e

e824290e5dcf


cb3a58d2acc0
e824290e5dcf
cb3a58d2acc0

cd9662094edf
5726fb2012f0



e824290e5dcf
e824290e5dcf

5726fb2012f0
e824290e5dcf
cd9662094edf
e824290e5dcf
e824290e5dcf

5726fb2012f0
e824290e5dcf


e824290e5dcf
5726fb2012f0
e824290e5dcf

e824290e5dcf

5726fb2012f0
e824290e5dcf
5726fb2012f0

e824290e5dcf
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535














                                                                       
                        
                     
 








                                                                     
                                                   
 

                                                             
 
                                 
 
                                                         




                                                
                         

         
                                      
                                                    


                   




                                                                     
                                                  
 

                                                                



                           
                                      
 
                                      











                                                                
                                        
                
                                                            
 












                                                           
                                            

                                      
                                  











                                                        
                                        

                                        
                 






                                          
                                      


                                      

                                        









                                                       









                                                                                
                                         



                                                                             
                                                    




                                         
                                                                           






























                                                        
                                                                       








                                                                            





                                                                     
                                                    








                                                       
                                            


                                                    
                                                    
                                                   



                                                

                                                       
                           
 
                                                                  






                                                              
                                      



                                                                           
                                      


                        

                                                           
                                      


                      


                          

                                              
                                                            

                                                     
                                   
                 



                                                             
                                                       








                                                             



                          

                                             
                                                  



                                                                

                                      

                         

                                             




                                                                  


                                         






































                                                                              
                                                  

                         

                                             
                                              



                                                        

                                      

                          

                                             


                                                          
                                              
 





                                                      

                      















                                                     
                          




                                                                            

                      









                                                        









                                                                        
                                             


                                                                
                                                  

                          
                                             
                                                  



                                                              

                                      

                
                              


                      

                                     


                   





                                                              

                                                                  
                                                    
 







                                                                            

                                                        
                                            
                                      

                                        
                              
                                                   
 
                                                    


                 
                                                    



                                       
                                        






                                          
                                            
 

                       

                                     

                                                                  

         
                                                        
 
                                   
                                                

                                                                        


                                                 
 
 

                                               
                                                       



                                                                            
                                                  

 
                                               
 
                          
                                         

 
                              


                
                                                                    
                    

                                                                           

 
                              
 

                                                                
 
/*
 * RTC subsystem, dev interface
 *
 * Copyright (C) 2005 Tower Technologies
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 *
 * based on arch/arm/common/rtctime.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/sched.h>
#include "rtc-core.h"

static dev_t rtc_devt;

#define RTC_DEV_MAX 16 /* 16 RTCs should be enough for everyone... */

static int rtc_dev_open(struct inode *inode, struct file *file)
{
	int err;
	struct rtc_device *rtc = container_of(inode->i_cdev,
					struct rtc_device, char_dev);
	const struct rtc_class_ops *ops = rtc->ops;

	if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags))
		return -EBUSY;

	file->private_data = rtc;

	err = ops->open ? ops->open(rtc->dev.parent) : 0;
	if (err == 0) {
		spin_lock_irq(&rtc->irq_lock);
		rtc->irq_data = 0;
		spin_unlock_irq(&rtc->irq_lock);

		return 0;
	}

	/* something has gone wrong */
	clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
	return err;
}

#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
/*
 * Routine to poll RTC seconds field for change as often as possible,
 * after first RTC_UIE use timer to reduce polling
 */
static void rtc_uie_task(struct work_struct *work)
{
	struct rtc_device *rtc =
		container_of(work, struct rtc_device, uie_task);
	struct rtc_time tm;
	int num = 0;
	int err;

	err = rtc_read_time(rtc, &tm);

	spin_lock_irq(&rtc->irq_lock);
	if (rtc->stop_uie_polling || err) {
		rtc->uie_task_active = 0;
	} else if (rtc->oldsecs != tm.tm_sec) {
		num = (tm.tm_sec + 60 - rtc->oldsecs) % 60;
		rtc->oldsecs = tm.tm_sec;
		rtc->uie_timer.expires = jiffies + HZ - (HZ/10);
		rtc->uie_timer_active = 1;
		rtc->uie_task_active = 0;
		add_timer(&rtc->uie_timer);
	} else if (schedule_work(&rtc->uie_task) == 0) {
		rtc->uie_task_active = 0;
	}
	spin_unlock_irq(&rtc->irq_lock);
	if (num)
		rtc_update_irq(rtc, num, RTC_UF | RTC_IRQF);
}
static void rtc_uie_timer(unsigned long data)
{
	struct rtc_device *rtc = (struct rtc_device *)data;
	unsigned long flags;

	spin_lock_irqsave(&rtc->irq_lock, flags);
	rtc->uie_timer_active = 0;
	rtc->uie_task_active = 1;
	if ((schedule_work(&rtc->uie_task) == 0))
		rtc->uie_task_active = 0;
	spin_unlock_irqrestore(&rtc->irq_lock, flags);
}

static int clear_uie(struct rtc_device *rtc)
{
	spin_lock_irq(&rtc->irq_lock);
	if (rtc->uie_irq_active) {
		rtc->stop_uie_polling = 1;
		if (rtc->uie_timer_active) {
			spin_unlock_irq(&rtc->irq_lock);
			del_timer_sync(&rtc->uie_timer);
			spin_lock_irq(&rtc->irq_lock);
			rtc->uie_timer_active = 0;
		}
		if (rtc->uie_task_active) {
			spin_unlock_irq(&rtc->irq_lock);
			flush_scheduled_work();
			spin_lock_irq(&rtc->irq_lock);
		}
		rtc->uie_irq_active = 0;
	}
	spin_unlock_irq(&rtc->irq_lock);
	return 0;
}

static int set_uie(struct rtc_device *rtc)
{
	struct rtc_time tm;
	int err;

	err = rtc_read_time(rtc, &tm);
	if (err)
		return err;
	spin_lock_irq(&rtc->irq_lock);
	if (!rtc->uie_irq_active) {
		rtc->uie_irq_active = 1;
		rtc->stop_uie_polling = 0;
		rtc->oldsecs = tm.tm_sec;
		rtc->uie_task_active = 1;
		if (schedule_work(&rtc->uie_task) == 0)
			rtc->uie_task_active = 0;
	}
	rtc->irq_data = 0;
	spin_unlock_irq(&rtc->irq_lock);
	return 0;
}

int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc, unsigned int enabled)
{
	if (enabled)
		return set_uie(rtc);
	else
		return clear_uie(rtc);
}
EXPORT_SYMBOL(rtc_dev_update_irq_enable_emul);

#endif /* CONFIG_RTC_INTF_DEV_UIE_EMUL */

static ssize_t
rtc_dev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
	struct rtc_device *rtc = file->private_data;

	DECLARE_WAITQUEUE(wait, current);
	unsigned long data;
	ssize_t ret;

	if (count != sizeof(unsigned int) && count < sizeof(unsigned long))
		return -EINVAL;

	add_wait_queue(&rtc->irq_queue, &wait);
	do {
		__set_current_state(TASK_INTERRUPTIBLE);

		spin_lock_irq(&rtc->irq_lock);
		data = rtc->irq_data;
		rtc->irq_data = 0;
		spin_unlock_irq(&rtc->irq_lock);

		if (data != 0) {
			ret = 0;
			break;
		}
		if (file->f_flags & O_NONBLOCK) {
			ret = -EAGAIN;
			break;
		}
		if (signal_pending(current)) {
			ret = -ERESTARTSYS;
			break;
		}
		schedule();
	} while (1);
	set_current_state(TASK_RUNNING);
	remove_wait_queue(&rtc->irq_queue, &wait);

	if (ret == 0) {
		/* Check for any data updates */
		if (rtc->ops->read_callback)
			data = rtc->ops->read_callback(rtc->dev.parent,
						       data);

		if (sizeof(int) != sizeof(long) &&
		    count == sizeof(unsigned int))
			ret = put_user(data, (unsigned int __user *)buf) ?:
				sizeof(unsigned int);
		else
			ret = put_user(data, (unsigned long __user *)buf) ?:
				sizeof(unsigned long);
	}
	return ret;
}

static unsigned int rtc_dev_poll(struct file *file, poll_table *wait)
{
	struct rtc_device *rtc = file->private_data;
	unsigned long data;

	poll_wait(file, &rtc->irq_queue, wait);

	data = rtc->irq_data;

	return (data != 0) ? (POLLIN | POLLRDNORM) : 0;
}

static long rtc_dev_ioctl(struct file *file,
		unsigned int cmd, unsigned long arg)
{
	int err = 0;
	struct rtc_device *rtc = file->private_data;
	const struct rtc_class_ops *ops = rtc->ops;
	struct rtc_time tm;
	struct rtc_wkalrm alarm;
	void __user *uarg = (void __user *) arg;

	err = mutex_lock_interruptible(&rtc->ops_lock);
	if (err)
		return err;

	/* check that the calling task has appropriate permissions
	 * for certain ioctls. doing this check here is useful
	 * to avoid duplicate code in each driver.
	 */
	switch (cmd) {
	case RTC_EPOCH_SET:
	case RTC_SET_TIME:
		if (!capable(CAP_SYS_TIME))
			err = -EACCES;
		break;

	case RTC_IRQP_SET:
		if (arg > rtc->max_user_freq && !capable(CAP_SYS_RESOURCE))
			err = -EACCES;
		break;

	case RTC_PIE_ON:
		if (rtc->irq_freq > rtc->max_user_freq &&
				!capable(CAP_SYS_RESOURCE))
			err = -EACCES;
		break;
	}

	if (err)
		goto done;

	/* try the driver's ioctl interface */
	if (ops->ioctl) {
		err = ops->ioctl(rtc->dev.parent, cmd, arg);
		if (err != -ENOIOCTLCMD) {
			mutex_unlock(&rtc->ops_lock);
			return err;
		}
	}

	/* if the driver does not provide the ioctl interface
	 * or if that particular ioctl was not implemented
	 * (-ENOIOCTLCMD), we will try to emulate here.
	 *
	 * Drivers *SHOULD NOT* provide ioctl implementations
	 * for these requests.  Instead, provide methods to
	 * support the following code, so that the RTC's main
	 * features are accessible without using ioctls.
	 *
	 * RTC and alarm times will be in UTC, by preference,
	 * but dual-booting with MS-Windows implies RTCs must
	 * use the local wall clock time.
	 */

	switch (cmd) {
	case RTC_ALM_READ:
		mutex_unlock(&rtc->ops_lock);

		err = rtc_read_alarm(rtc, &alarm);
		if (err < 0)
			return err;

		if (copy_to_user(uarg, &alarm.time, sizeof(tm)))
			err = -EFAULT;
		return err;

	case RTC_ALM_SET:
		mutex_unlock(&rtc->ops_lock);

		if (copy_from_user(&alarm.time, uarg, sizeof(tm)))
			return -EFAULT;

		alarm.enabled = 0;
		alarm.pending = 0;
		alarm.time.tm_wday = -1;
		alarm.time.tm_yday = -1;
		alarm.time.tm_isdst = -1;

		/* RTC_ALM_SET alarms may be up to 24 hours in the future.
		 * Rather than expecting every RTC to implement "don't care"
		 * for day/month/year fields, just force the alarm to have
		 * the right values for those fields.
		 *
		 * RTC_WKALM_SET should be used instead.  Not only does it
		 * eliminate the need for a separate RTC_AIE_ON call, it
		 * doesn't have the "alarm 23:59:59 in the future" race.
		 *
		 * NOTE:  some legacy code may have used invalid fields as
		 * wildcards, exposing hardware "periodic alarm" capabilities.
		 * Not supported here.
		 */
		{
			unsigned long now, then;

			err = rtc_read_time(rtc, &tm);
			if (err < 0)
				return err;
			rtc_tm_to_time(&tm, &now);

			alarm.time.tm_mday = tm.tm_mday;
			alarm.time.tm_mon = tm.tm_mon;
			alarm.time.tm_year = tm.tm_year;
			err  = rtc_valid_tm(&alarm.time);
			if (err < 0)
				return err;
			rtc_tm_to_time(&alarm.time, &then);

			/* alarm may need to wrap into tomorrow */
			if (then < now) {
				rtc_time_to_tm(now + 24 * 60 * 60, &tm);
				alarm.time.tm_mday = tm.tm_mday;
				alarm.time.tm_mon = tm.tm_mon;
				alarm.time.tm_year = tm.tm_year;
			}
		}

		return rtc_set_alarm(rtc, &alarm);

	case RTC_RD_TIME:
		mutex_unlock(&rtc->ops_lock);

		err = rtc_read_time(rtc, &tm);
		if (err < 0)
			return err;

		if (copy_to_user(uarg, &tm, sizeof(tm)))
			err = -EFAULT;
		return err;

	case RTC_SET_TIME:
		mutex_unlock(&rtc->ops_lock);

		if (copy_from_user(&tm, uarg, sizeof(tm)))
			return -EFAULT;

		return rtc_set_time(rtc, &tm);

	case RTC_PIE_ON:
		err = rtc_irq_set_state(rtc, NULL, 1);
		break;

	case RTC_PIE_OFF:
		err = rtc_irq_set_state(rtc, NULL, 0);
		break;

	case RTC_AIE_ON:
		mutex_unlock(&rtc->ops_lock);
		return rtc_alarm_irq_enable(rtc, 1);

	case RTC_AIE_OFF:
		mutex_unlock(&rtc->ops_lock);
		return rtc_alarm_irq_enable(rtc, 0);

	case RTC_UIE_ON:
		mutex_unlock(&rtc->ops_lock);
		return rtc_update_irq_enable(rtc, 1);

	case RTC_UIE_OFF:
		mutex_unlock(&rtc->ops_lock);
		return rtc_update_irq_enable(rtc, 0);

	case RTC_IRQP_SET:
		err = rtc_irq_set_freq(rtc, NULL, arg);
		break;

	case RTC_IRQP_READ:
		err = put_user(rtc->irq_freq, (unsigned long __user *)uarg);
		break;

#if 0
	case RTC_EPOCH_SET:
#ifndef rtc_epoch
		/*
		 * There were no RTC clocks before 1900.
		 */
		if (arg < 1900) {
			err = -EINVAL;
			break;
		}
		rtc_epoch = arg;
		err = 0;
#endif
		break;

	case RTC_EPOCH_READ:
		err = put_user(rtc_epoch, (unsigned long __user *)uarg);
		break;
#endif
	case RTC_WKALM_SET:
		mutex_unlock(&rtc->ops_lock);
		if (copy_from_user(&alarm, uarg, sizeof(alarm)))
			return -EFAULT;

		return rtc_set_alarm(rtc, &alarm);

	case RTC_WKALM_RD:
		mutex_unlock(&rtc->ops_lock);
		err = rtc_read_alarm(rtc, &alarm);
		if (err < 0)
			return err;

		if (copy_to_user(uarg, &alarm, sizeof(alarm)))
			err = -EFAULT;
		return err;

	default:
		err = -ENOTTY;
		break;
	}

done:
	mutex_unlock(&rtc->ops_lock);
	return err;
}

static int rtc_dev_fasync(int fd, struct file *file, int on)
{
	struct rtc_device *rtc = file->private_data;
	return fasync_helper(fd, file, on, &rtc->async_queue);
}

static int rtc_dev_release(struct inode *inode, struct file *file)
{
	struct rtc_device *rtc = file->private_data;

	/* We shut down the repeating IRQs that userspace enabled,
	 * since nothing is listening to them.
	 *  - Update (UIE) ... currently only managed through ioctls
	 *  - Periodic (PIE) ... also used through rtc_*() interface calls
	 *
	 * Leave the alarm alone; it may be set to trigger a system wakeup
	 * later, or be used by kernel code, and is a one-shot event anyway.
	 */

	/* Keep ioctl until all drivers are converted */
	rtc_dev_ioctl(file, RTC_UIE_OFF, 0);
	rtc_update_irq_enable(rtc, 0);
	rtc_irq_set_state(rtc, NULL, 0);

	if (rtc->ops->release)
		rtc->ops->release(rtc->dev.parent);

	clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
	return 0;
}

static const struct file_operations rtc_dev_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.read		= rtc_dev_read,
	.poll		= rtc_dev_poll,
	.unlocked_ioctl	= rtc_dev_ioctl,
	.open		= rtc_dev_open,
	.release	= rtc_dev_release,
	.fasync		= rtc_dev_fasync,
};

/* insertion/removal hooks */

void rtc_dev_prepare(struct rtc_device *rtc)
{
	if (!rtc_devt)
		return;

	if (rtc->id >= RTC_DEV_MAX) {
		pr_debug("%s: too many RTC devices\n", rtc->name);
		return;
	}

	rtc->dev.devt = MKDEV(MAJOR(rtc_devt), rtc->id);

#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
	INIT_WORK(&rtc->uie_task, rtc_uie_task);
	setup_timer(&rtc->uie_timer, rtc_uie_timer, (unsigned long)rtc);
#endif

	cdev_init(&rtc->char_dev, &rtc_dev_fops);
	rtc->char_dev.owner = rtc->owner;
}

void rtc_dev_add_device(struct rtc_device *rtc)
{
	if (cdev_add(&rtc->char_dev, rtc->dev.devt, 1))
		printk(KERN_WARNING "%s: failed to add char device %d:%d\n",
			rtc->name, MAJOR(rtc_devt), rtc->id);
	else
		pr_debug("%s: dev (%d:%d)\n", rtc->name,
			MAJOR(rtc_devt), rtc->id);
}

void rtc_dev_del_device(struct rtc_device *rtc)
{
	if (rtc->dev.devt)
		cdev_del(&rtc->char_dev);
}

void __init rtc_dev_init(void)
{
	int err;

	err = alloc_chrdev_region(&rtc_devt, 0, RTC_DEV_MAX, "rtc");
	if (err < 0)
		printk(KERN_ERR "%s: failed to allocate char dev region\n",
			__FILE__);
}

void __exit rtc_dev_exit(void)
{
	if (rtc_devt)
		unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
}