Move exmaples to separate directory

2026-01-22 20:05:53 +01:00
parent 654303b9ec
commit d6e0fb978e
3 changed files with 148 additions and 0 deletions
--- a/examples/gpio.c
+++ b/examples/gpio.c
@@ -0,0 +1,59 @@
+#include <fcntl.h>
+#include <inttypes.h>
+#include <linux/gpio.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#define check(e)                                                               \
+  ({                                                                           \
+    int ec = (e);                                                              \
+    if (ec < 0) {                                                              \
+      perror(#e);                                                              \
+      exit(1);                                                                 \
+    }                                                                          \
+    ec;                                                                        \
+  })
+
+void gpio_info(int gpio_fd) {
+  struct gpiochip_info chip_info;
+  check(ioctl(gpio_fd, GPIO_GET_CHIPINFO_IOCTL, &chip_info));
+
+  printf("Name: %s, Label: %s, %" PRIu32 " lines\n", chip_info.name,
+         chip_info.label, chip_info.lines);
+
+  for (__u32 i = 0; i != chip_info.lines; ++i) {
+    struct gpio_v2_line_info line_info = {
+        .offset = i,
+    };
+    check(ioctl(gpio_fd, GPIO_V2_GET_LINEINFO_IOCTL, &line_info));
+    printf("Line %" PRIu32 ": '%s'. Consumer: %s\n", i, line_info.name,
+           line_info.consumer[0] ? line_info.consumer : "<none>");
+  }
+}
+
+int main() {
+  int gpio0 = check(open("/dev/gpiochip0", O_RDWR));
+
+  gpio_info(gpio0);
+
+#if 0
+  struct gpio_v2_line_request line_request = {
+      .offsets = {18},
+      .num_lines = 1,
+      .consumer = "my-super-cool-gpio",
+  };
+  check(ioctl(gpio0, GPIO_V2_GET_LINE_IOCTL, &line_request));
+
+  struct gpio_v2_line_info line_info = {
+      .offset = 18,
+  };
+  check(ioctl(gpio0, GPIO_V2_GET_LINEINFO_IOCTL, &line_info));
+  printf("Line 18: '%s'. Consumer: '%s'\n", line_info.name, line_info.consumer);
+
+  close(line_request.fd);
+#endif
+  close(gpio0);
+}