forked from ~ljy/RK356X_SDK_RELEASE
blame | history | patch | commit | commitdiff
hc
2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/tools/gpio/gpio-event-mon.c
....@@ -1,11 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * gpio-event-mon - monitor GPIO line events from userspace
34  *
45  * Copyright (C) 2016 Linus Walleij
5
- *
6
- * This program is free software; you can redistribute it and/or modify it
7
- * under the terms of the GNU General Public License version 2 as published by
8
- * the Free Software Foundation.
96  *
107  * Usage:
118  *	gpio-event-mon -n <device-name> -o <offset>
....@@ -26,17 +23,17 @@
2623 #include <sys/ioctl.h>
2724 #include <sys/types.h>
2825 #include <linux/gpio.h>
26
+#include "gpio-utils.h"
2927 
3028 int monitor_device(const char *device_name,
31
-		   unsigned int line,
32
-		   uint32_t handleflags,
33
-		   uint32_t eventflags,
29
+		   unsigned int *lines,
30
+		   unsigned int num_lines,
31
+		   struct gpio_v2_line_config *config,
3432 		   unsigned int loops)
3533 {
36
-	struct gpioevent_request req;
37
-	struct gpiohandle_data data;
34
+	struct gpio_v2_line_values values;
3835 	char *chrdev_name;
39
-	int fd;
36
+	int cfd, lfd;
4037 	int ret;
4138 	int i = 0;
4239 
....@@ -44,44 +41,56 @@
4441 	if (ret < 0)
4542 		return -ENOMEM;
4643 
47
-	fd = open(chrdev_name, 0);
48
-	if (fd == -1) {
44
+	cfd = open(chrdev_name, 0);
45
+	if (cfd == -1) {
4946 		ret = -errno;
5047 		fprintf(stderr, "Failed to open %s\n", chrdev_name);
51
-		goto exit_close_error;
48
+		goto exit_free_name;
5249 	}
5350 
54
-	req.lineoffset = line;
55
-	req.handleflags = handleflags;
56
-	req.eventflags = eventflags;
57
-	strcpy(req.consumer_label, "gpio-event-mon");
58
-
59
-	ret = ioctl(fd, GPIO_GET_LINEEVENT_IOCTL, &req);
60
-	if (ret == -1) {
61
-		ret = -errno;
62
-		fprintf(stderr, "Failed to issue GET EVENT "
63
-			"IOCTL (%d)\n",
64
-			ret);
65
-		goto exit_close_error;
66
-	}
51
+	ret = gpiotools_request_line(device_name, lines, num_lines, config,
52
+				     "gpio-event-mon");
53
+	if (ret < 0)
54
+		goto exit_device_close;
55
+	else
56
+		lfd = ret;
6757 
6858 	/* Read initial states */
69
-	ret = ioctl(req.fd, GPIOHANDLE_GET_LINE_VALUES_IOCTL, &data);
70
-	if (ret == -1) {
71
-		ret = -errno;
72
-		fprintf(stderr, "Failed to issue GPIOHANDLE GET LINE "
73
-			"VALUES IOCTL (%d)\n",
59
+	values.mask = 0;
60
+	values.bits = 0;
61
+	for (i = 0; i < num_lines; i++)
62
+		gpiotools_set_bit(&values.mask, i);
63
+	ret = gpiotools_get_values(lfd, &values);
64
+	if (ret < 0) {
65
+		fprintf(stderr,
66
+			"Failed to issue GPIO LINE GET VALUES IOCTL (%d)\n",
7467 			ret);
75
-		goto exit_close_error;
68
+		goto exit_line_close;
7669 	}
7770 
78
-	fprintf(stdout, "Monitoring line %d on %s\n", line, device_name);
79
-	fprintf(stdout, "Initial line value: %d\n", data.values[0]);
71
+	if (num_lines == 1) {
72
+		fprintf(stdout, "Monitoring line %d on %s\n", lines[0], device_name);
73
+		fprintf(stdout, "Initial line value: %d\n",
74
+			gpiotools_test_bit(values.bits, 0));
75
+	} else {
76
+		fprintf(stdout, "Monitoring lines %d", lines[0]);
77
+		for (i = 1; i < num_lines - 1; i++)
78
+			fprintf(stdout, ", %d", lines[i]);
79
+		fprintf(stdout, " and %d on %s\n", lines[i], device_name);
80
+		fprintf(stdout, "Initial line values: %d",
81
+			gpiotools_test_bit(values.bits, 0));
82
+		for (i = 1; i < num_lines - 1; i++)
83
+			fprintf(stdout, ", %d",
84
+				gpiotools_test_bit(values.bits, i));
85
+		fprintf(stdout, " and %d\n",
86
+			gpiotools_test_bit(values.bits, i));
87
+	}
8088 
89
+	i = 0;
8190 	while (1) {
82
-		struct gpioevent_data event;
91
+		struct gpio_v2_line_event event;
8392 
84
-		ret = read(req.fd, &event, sizeof(event));
93
+		ret = read(lfd, &event, sizeof(event));
8594 		if (ret == -1) {
8695 			if (errno == -EAGAIN) {
8796 				fprintf(stderr, "nothing available\n");
....@@ -99,12 +108,14 @@
99108 			ret = -EIO;
100109 			break;
101110 		}
102
-		fprintf(stdout, "GPIO EVENT %llu: ", event.timestamp);
111
+		fprintf(stdout, "GPIO EVENT at %" PRIu64 " on line %d (%d|%d) ",
112
+			(uint64_t)event.timestamp_ns, event.offset, event.line_seqno,
113
+			event.seqno);
103114 		switch (event.id) {
104
-		case GPIOEVENT_EVENT_RISING_EDGE:
115
+		case GPIO_V2_LINE_EVENT_RISING_EDGE:
105116 			fprintf(stdout, "rising edge");
106117 			break;
107
-		case GPIOEVENT_EVENT_FALLING_EDGE:
118
+		case GPIO_V2_LINE_EVENT_FALLING_EDGE:
108119 			fprintf(stdout, "falling edge");
109120 			break;
110121 		default:
....@@ -117,9 +128,13 @@
117128 			break;
118129 	}
119130 
120
-exit_close_error:
121
-	if (close(fd) == -1)
131
+exit_line_close:
132
+	if (close(lfd) == -1)
133
+		perror("Failed to close line file");
134
+exit_device_close:
135
+	if (close(cfd) == -1)
122136 		perror("Failed to close GPIO character device file");
137
+exit_free_name:
123138 	free(chrdev_name);
124139 	return ret;
125140 }
....@@ -129,29 +144,37 @@
129144 	fprintf(stderr, "Usage: gpio-event-mon [options]...\n"
130145 		"Listen to events on GPIO lines, 0->1 1->0\n"
131146 		"  -n <name>  Listen on GPIOs on a named device (must be stated)\n"
132
-		"  -o <n>     Offset to monitor\n"
147
+		"  -o <n>     Offset of line to monitor (may be repeated)\n"
133148 		"  -d         Set line as open drain\n"
134149 		"  -s         Set line as open source\n"
135150 		"  -r         Listen for rising edges\n"
136151 		"  -f         Listen for falling edges\n"
152
+		"  -b <n>     Debounce the line with period n microseconds\n"
137153 		" [-c <n>]    Do <n> loops (optional, infinite loop if not stated)\n"
138154 		"  -?         This helptext\n"
139155 		"\n"
140156 		"Example:\n"
141
-		"gpio-event-mon -n gpiochip0 -o 4 -r -f\n"
157
+		"gpio-event-mon -n gpiochip0 -o 4 -r -f -b 10000\n"
142158 	);
143159 }
160
+
161
+#define EDGE_FLAGS \
162
+	(GPIO_V2_LINE_FLAG_EDGE_RISING | \
163
+	 GPIO_V2_LINE_FLAG_EDGE_FALLING)
144164 
145165 int main(int argc, char **argv)
146166 {
147167 	const char *device_name = NULL;
148
-	unsigned int line = -1;
168
+	unsigned int lines[GPIO_V2_LINES_MAX];
169
+	unsigned int num_lines = 0;
149170 	unsigned int loops = 0;
150
-	uint32_t handleflags = GPIOHANDLE_REQUEST_INPUT;
151
-	uint32_t eventflags = 0;
152
-	int c;
171
+	struct gpio_v2_line_config config;
172
+	int c, attr, i;
173
+	unsigned long debounce_period_us = 0;
153174 
154
-	while ((c = getopt(argc, argv, "c:n:o:dsrf?")) != -1) {
175
+	memset(&config, 0, sizeof(config));
176
+	config.flags = GPIO_V2_LINE_FLAG_INPUT;
177
+	while ((c = getopt(argc, argv, "c:n:o:b:dsrf?")) != -1) {
155178 		switch (c) {
156179 		case 'c':
157180 			loops = strtoul(optarg, NULL, 10);
....@@ -160,19 +183,27 @@
160183 			device_name = optarg;
161184 			break;
162185 		case 'o':
163
-			line = strtoul(optarg, NULL, 10);
186
+			if (num_lines >= GPIO_V2_LINES_MAX) {
187
+				print_usage();
188
+				return -1;
189
+			}
190
+			lines[num_lines] = strtoul(optarg, NULL, 10);
191
+			num_lines++;
192
+			break;
193
+		case 'b':
194
+			debounce_period_us = strtoul(optarg, NULL, 10);
164195 			break;
165196 		case 'd':
166
-			handleflags |= GPIOHANDLE_REQUEST_OPEN_DRAIN;
197
+			config.flags |= GPIO_V2_LINE_FLAG_OPEN_DRAIN;
167198 			break;
168199 		case 's':
169
-			handleflags |= GPIOHANDLE_REQUEST_OPEN_SOURCE;
200
+			config.flags |= GPIO_V2_LINE_FLAG_OPEN_SOURCE;
170201 			break;
171202 		case 'r':
172
-			eventflags |= GPIOEVENT_REQUEST_RISING_EDGE;
203
+			config.flags |= GPIO_V2_LINE_FLAG_EDGE_RISING;
173204 			break;
174205 		case 'f':
175
-			eventflags |= GPIOEVENT_REQUEST_FALLING_EDGE;
206
+			config.flags |= GPIO_V2_LINE_FLAG_EDGE_FALLING;
176207 			break;
177208 		case '?':
178209 			print_usage();
....@@ -180,15 +211,23 @@
180211 		}
181212 	}
182213 
183
-	if (!device_name || line == -1) {
214
+	if (debounce_period_us) {
215
+		attr = config.num_attrs;
216
+		config.num_attrs++;
217
+		for (i = 0; i < num_lines; i++)
218
+			gpiotools_set_bit(&config.attrs[attr].mask, i);
219
+		config.attrs[attr].attr.id = GPIO_V2_LINE_ATTR_ID_DEBOUNCE;
220
+		config.attrs[attr].attr.debounce_period_us = debounce_period_us;
221
+	}
222
+
223
+	if (!device_name || num_lines == 0) {
184224 		print_usage();
185225 		return -1;
186226 	}
187
-	if (!eventflags) {
227
+	if (!(config.flags & EDGE_FLAGS)) {
188228 		printf("No flags specified, listening on both rising and "
189229 		       "falling edges\n");
190
-		eventflags = GPIOEVENT_REQUEST_BOTH_EDGES;
230
+		config.flags |= EDGE_FLAGS;
191231 	}
192
-	return monitor_device(device_name, line, handleflags,
193
-			      eventflags, loops);
232
+	return monitor_device(device_name, lines, num_lines, &config, loops);
194233 }