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author | Alan Ott <alan@signal11.us> | 2011-03-19 20:29:44 -0400 |
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committer | Jiri Kosina <jkosina@suse.cz> | 2011-03-22 11:43:50 +0100 |
commit | c54ea4918c2b7722d7242ea53271356501988a9b (patch) | |
tree | e4c7b3c77748eef20e8b844633643cb00d8bc5e2 /samples/hidraw/hid-example.c | |
parent | 99759619b27662d1290901228d77a293e6e83200 (diff) | |
download | linux-c54ea4918c2b7722d7242ea53271356501988a9b.tar.bz2 |
HID: Documentation for hidraw
Documenation for the hidraw driver, with sample program.
Signed-off-by: Alan Ott <alan@signal11.us>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'samples/hidraw/hid-example.c')
-rw-r--r-- | samples/hidraw/hid-example.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/samples/hidraw/hid-example.c b/samples/hidraw/hid-example.c new file mode 100644 index 000000000000..40e3d6200582 --- /dev/null +++ b/samples/hidraw/hid-example.c @@ -0,0 +1,167 @@ +/* + * Hidraw Userspace Example + * + * Copyright (c) 2010 Alan Ott <alan@signal11.us> + * Copyright (c) 2010 Signal 11 Software + * + * The code may be used by anyone for any purpose, + * and can serve as a starting point for developing + * applications using hidraw. + */ + +/* Linux */ +#include <linux/types.h> +#include <linux/input.h> +#include <linux/hidraw.h> + +/* Unix */ +#include <sys/ioctl.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> + +/* C */ +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <errno.h> + +const char *bus_str(int bus); + +int main(int argc, char **argv) +{ + int fd; + int i, res, desc_size = 0; + char buf[256]; + struct hidraw_report_descriptor rpt_desc; + struct hidraw_devinfo info; + + /* Open the Device with non-blocking reads. In real life, + don't use a hard coded path; use libudev instead. */ + fd = open("/dev/hidraw0", O_RDWR|O_NONBLOCK); + + if (fd < 0) { + perror("Unable to open device"); + return 1; + } + + memset(&rpt_desc, 0x0, sizeof(rpt_desc)); + memset(&info, 0x0, sizeof(info)); + memset(buf, 0x0, sizeof(buf)); + + /* Get Report Descriptor Size */ + res = ioctl(fd, HIDIOCGRDESCSIZE, &desc_size); + if (res < 0) + perror("HIDIOCGRDESCSIZE"); + else + printf("Report Descriptor Size: %d\n", desc_size); + + /* Get Report Descriptor */ + rpt_desc.size = desc_size; + res = ioctl(fd, HIDIOCGRDESC, &rpt_desc); + if (res < 0) { + perror("HIDIOCGRDESC"); + } else { + printf("Report Descriptor:\n"); + for (i = 0; i < rpt_desc.size; i++) + printf("%hhx ", rpt_desc.value[i]); + puts("\n"); + } + + /* Get Raw Name */ + res = ioctl(fd, HIDIOCGRAWNAME(256), buf); + if (res < 0) + perror("HIDIOCGRAWNAME"); + else + printf("Raw Name: %s\n", buf); + + /* Get Physical Location */ + res = ioctl(fd, HIDIOCGRAWPHYS(256), buf); + if (res < 0) + perror("HIDIOCGRAWPHYS"); + else + printf("Raw Phys: %s\n", buf); + + /* Get Raw Info */ + res = ioctl(fd, HIDIOCGRAWINFO, &info); + if (res < 0) { + perror("HIDIOCGRAWINFO"); + } else { + printf("Raw Info:\n"); + printf("\tbustype: %d (%s)\n", + info.bustype, bus_str(info.bustype)); + printf("\tvendor: 0x%04hx\n", info.vendor); + printf("\tproduct: 0x%04hx\n", info.product); + } + + /* Set Feature */ + buf[0] = 0x9; /* Report Number */ + buf[1] = 0xff; + buf[2] = 0xff; + buf[3] = 0xff; + res = ioctl(fd, HIDIOCSFEATURE(4), buf); + if (res < 0) + perror("HIDIOCSFEATURE"); + else + printf("ioctl HIDIOCGFEATURE returned: %d\n", res); + + /* Get Feature */ + buf[0] = 0x9; /* Report Number */ + res = ioctl(fd, HIDIOCGFEATURE(256), buf); + if (res < 0) { + perror("HIDIOCGFEATURE"); + } else { + printf("ioctl HIDIOCGFEATURE returned: %d\n", res); + printf("Report data (not containing the report number):\n\t"); + for (i = 0; i < res; i++) + printf("%hhx ", buf[i]); + puts("\n"); + } + + /* Send a Report to the Device */ + buf[0] = 0x1; /* Report Number */ + buf[1] = 0x77; + res = write(fd, buf, 2); + if (res < 0) { + printf("Error: %d\n", errno); + perror("write"); + } else { + printf("write() wrote %d bytes\n", res); + } + + /* Get a report from the device */ + res = read(fd, buf, 16); + if (res < 0) { + perror("read"); + } else { + printf("read() read %d bytes:\n\t", res); + for (i = 0; i < res; i++) + printf("%hhx ", buf[i]); + puts("\n"); + } + close(fd); + return 0; +} + +const char * +bus_str(int bus) +{ + switch (bus) { + case BUS_USB: + return "USB"; + break; + case BUS_HIL: + return "HIL"; + break; + case BUS_BLUETOOTH: + return "Bluetooth"; + break; + case BUS_VIRTUAL: + return "Virtual"; + break; + default: + return "Other"; + break; + } +} |