summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/timers/rtctest.c
blob: d80ae852334d1560522f0b74034479bf7efe00d1 (plain)
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
/*
 *      Real Time Clock Driver Test/Example Program
 *
 *      Compile with:
 *		     gcc -s -Wall -Wstrict-prototypes rtctest.c -o rtctest
 *
 *      Copyright (C) 1996, Paul Gortmaker.
 *
 *      Released under the GNU General Public License, version 2,
 *      included herein by reference.
 *
 */

#include <stdio.h>
#include <linux/rtc.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>


/*
 * This expects the new RTC class driver framework, working with
 * clocks that will often not be clones of what the PC-AT had.
 * Use the command line to specify another RTC if you need one.
 */
static const char default_rtc[] = "/dev/rtc0";


int main(int argc, char **argv)
{
	int i, fd, retval, irqcount = 0;
	unsigned long tmp, data;
	struct rtc_time rtc_tm;
	const char *rtc = default_rtc;
	struct timeval start, end, diff;

	switch (argc) {
	case 2:
		rtc = argv[1];
		/* FALLTHROUGH */
	case 1:
		break;
	default:
		fprintf(stderr, "usage:  rtctest [rtcdev]\n");
		return 1;
	}

	fd = open(rtc, O_RDONLY);

	if (fd ==  -1) {
		perror(rtc);
		exit(errno);
	}

	fprintf(stderr, "\n\t\t\tRTC Driver Test Example.\n\n");

	/* Turn on update interrupts (one per second) */
	retval = ioctl(fd, RTC_UIE_ON, 0);
	if (retval == -1) {
		if (errno == ENOTTY) {
			fprintf(stderr,
				"\n...Update IRQs not supported.\n");
			goto test_READ;
		}
		perror("RTC_UIE_ON ioctl");
		exit(errno);
	}

	fprintf(stderr, "Counting 5 update (1/sec) interrupts from reading %s:",
			rtc);
	fflush(stderr);
	for (i=1; i<6; i++) {
		/* This read will block */
		retval = read(fd, &data, sizeof(unsigned long));
		if (retval == -1) {
			perror("read");
			exit(errno);
		}
		fprintf(stderr, " %d",i);
		fflush(stderr);
		irqcount++;
	}

	fprintf(stderr, "\nAgain, from using select(2) on /dev/rtc:");
	fflush(stderr);
	for (i=1; i<6; i++) {
		struct timeval tv = {5, 0};     /* 5 second timeout on select */
		fd_set readfds;

		FD_ZERO(&readfds);
		FD_SET(fd, &readfds);
		/* The select will wait until an RTC interrupt happens. */
		retval = select(fd+1, &readfds, NULL, NULL, &tv);
		if (retval == -1) {
		        perror("select");
		        exit(errno);
		}
		/* This read won't block unlike the select-less case above. */
		retval = read(fd, &data, sizeof(unsigned long));
		if (retval == -1) {
		        perror("read");
		        exit(errno);
		}
		fprintf(stderr, " %d",i);
		fflush(stderr);
		irqcount++;
	}

	/* Turn off update interrupts */
	retval = ioctl(fd, RTC_UIE_OFF, 0);
	if (retval == -1) {
		perror("RTC_UIE_OFF ioctl");
		exit(errno);
	}

test_READ:
	/* Read the RTC time/date */
	retval = ioctl(fd, RTC_RD_TIME, &rtc_tm);
	if (retval == -1) {
		perror("RTC_RD_TIME ioctl");
		exit(errno);
	}

	fprintf(stderr, "\n\nCurrent RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
		rtc_tm.tm_mday, rtc_tm.tm_mon + 1, rtc_tm.tm_year + 1900,
		rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);

	/* Set the alarm to 5 sec in the future, and check for rollover */
	rtc_tm.tm_sec += 5;
	if (rtc_tm.tm_sec >= 60) {
		rtc_tm.tm_sec %= 60;
		rtc_tm.tm_min++;
	}
	if (rtc_tm.tm_min == 60) {
		rtc_tm.tm_min = 0;
		rtc_tm.tm_hour++;
	}
	if (rtc_tm.tm_hour == 24)
		rtc_tm.tm_hour = 0;

	retval = ioctl(fd, RTC_ALM_SET, &rtc_tm);
	if (retval == -1) {
		if (errno == ENOTTY) {
			fprintf(stderr,
				"\n...Alarm IRQs not supported.\n");
			goto test_PIE;
		}
		perror("RTC_ALM_SET ioctl");
		exit(errno);
	}

	/* Read the current alarm settings */
	retval = ioctl(fd, RTC_ALM_READ, &rtc_tm);
	if (retval == -1) {
		perror("RTC_ALM_READ ioctl");
		exit(errno);
	}

	fprintf(stderr, "Alarm time now set to %02d:%02d:%02d.\n",
		rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);

	/* Enable alarm interrupts */
	retval = ioctl(fd, RTC_AIE_ON, 0);
	if (retval == -1) {
		perror("RTC_AIE_ON ioctl");
		exit(errno);
	}

	fprintf(stderr, "Waiting 5 seconds for alarm...");
	fflush(stderr);
	/* This blocks until the alarm ring causes an interrupt */
	retval = read(fd, &data, sizeof(unsigned long));
	if (retval == -1) {
		perror("read");
		exit(errno);
	}
	irqcount++;
	fprintf(stderr, " okay. Alarm rang.\n");

	/* Disable alarm interrupts */
	retval = ioctl(fd, RTC_AIE_OFF, 0);
	if (retval == -1) {
		perror("RTC_AIE_OFF ioctl");
		exit(errno);
	}

test_PIE:
	/* Read periodic IRQ rate */
	retval = ioctl(fd, RTC_IRQP_READ, &tmp);
	if (retval == -1) {
		/* not all RTCs support periodic IRQs */
		if (errno == ENOTTY) {
			fprintf(stderr, "\nNo periodic IRQ support\n");
			goto done;
		}
		perror("RTC_IRQP_READ ioctl");
		exit(errno);
	}
	fprintf(stderr, "\nPeriodic IRQ rate is %ldHz.\n", tmp);

	fprintf(stderr, "Counting 20 interrupts at:");
	fflush(stderr);

	/* The frequencies 128Hz, 256Hz, ... 8192Hz are only allowed for root. */
	for (tmp=2; tmp<=64; tmp*=2) {

		retval = ioctl(fd, RTC_IRQP_SET, tmp);
		if (retval == -1) {
			/* not all RTCs can change their periodic IRQ rate */
			if (errno == ENOTTY) {
				fprintf(stderr,
					"\n...Periodic IRQ rate is fixed\n");
				goto done;
			}
			perror("RTC_IRQP_SET ioctl");
			exit(errno);
		}

		fprintf(stderr, "\n%ldHz:\t", tmp);
		fflush(stderr);

		/* Enable periodic interrupts */
		retval = ioctl(fd, RTC_PIE_ON, 0);
		if (retval == -1) {
			perror("RTC_PIE_ON ioctl");
			exit(errno);
		}

		for (i=1; i<21; i++) {
			gettimeofday(&start, NULL);
			/* This blocks */
			retval = read(fd, &data, sizeof(unsigned long));
			if (retval == -1) {
				perror("read");
				exit(errno);
			}
			gettimeofday(&end, NULL);
			timersub(&end, &start, &diff);
			if (diff.tv_sec > 0 ||
			    diff.tv_usec > ((1000000L / tmp) * 1.10)) {
				fprintf(stderr, "\nPIE delta error: %ld.%06ld should be close to 0.%06ld\n",
				       diff.tv_sec, diff.tv_usec,
				       (1000000L / tmp));
				fflush(stdout);
				exit(-1);
			}

			fprintf(stderr, " %d",i);
			fflush(stderr);
			irqcount++;
		}

		/* Disable periodic interrupts */
		retval = ioctl(fd, RTC_PIE_OFF, 0);
		if (retval == -1) {
			perror("RTC_PIE_OFF ioctl");
			exit(errno);
		}
	}

done:
	fprintf(stderr, "\n\n\t\t\t *** Test complete ***\n");

	close(fd);

	return 0;
}
OpenPOWER on IntegriCloud