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![Jiri Kosina](/assets/img/avatar_default.png)
On systems where userspace doesn't have new hidraw.h populated to /usr/include, the hidraw sample won't compile as it's missing the new ioctl defitions. Introduce temporary ugly workaround to define the ioctls "manually" in such cases, just to avoid miscompilation in allmodconfig cases. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
178 lines
3.8 KiB
C
178 lines
3.8 KiB
C
/*
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* Hidraw Userspace Example
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*
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* Copyright (c) 2010 Alan Ott <alan@signal11.us>
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* Copyright (c) 2010 Signal 11 Software
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*
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* The code may be used by anyone for any purpose,
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* and can serve as a starting point for developing
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* applications using hidraw.
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*/
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/* Linux */
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#include <linux/types.h>
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#include <linux/input.h>
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#include <linux/hidraw.h>
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/*
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* Ugly hack to work around failing compilation on systems that don't
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* yet populate new version of hidraw.h to userspace.
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*
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* If you need this, please have your distro update the kernel headers.
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*/
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#ifndef HIDIOCSFEATURE
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#define HIDIOCSFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x06, len)
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#define HIDIOCGFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x07, len)
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#endif
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/* Unix */
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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/* C */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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const char *bus_str(int bus);
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int main(int argc, char **argv)
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{
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int fd;
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int i, res, desc_size = 0;
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char buf[256];
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struct hidraw_report_descriptor rpt_desc;
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struct hidraw_devinfo info;
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/* Open the Device with non-blocking reads. In real life,
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don't use a hard coded path; use libudev instead. */
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fd = open("/dev/hidraw0", O_RDWR|O_NONBLOCK);
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if (fd < 0) {
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perror("Unable to open device");
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return 1;
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}
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memset(&rpt_desc, 0x0, sizeof(rpt_desc));
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memset(&info, 0x0, sizeof(info));
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memset(buf, 0x0, sizeof(buf));
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/* Get Report Descriptor Size */
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res = ioctl(fd, HIDIOCGRDESCSIZE, &desc_size);
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if (res < 0)
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perror("HIDIOCGRDESCSIZE");
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else
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printf("Report Descriptor Size: %d\n", desc_size);
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/* Get Report Descriptor */
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rpt_desc.size = desc_size;
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res = ioctl(fd, HIDIOCGRDESC, &rpt_desc);
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if (res < 0) {
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perror("HIDIOCGRDESC");
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} else {
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printf("Report Descriptor:\n");
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for (i = 0; i < rpt_desc.size; i++)
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printf("%hhx ", rpt_desc.value[i]);
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puts("\n");
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}
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/* Get Raw Name */
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res = ioctl(fd, HIDIOCGRAWNAME(256), buf);
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if (res < 0)
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perror("HIDIOCGRAWNAME");
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else
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printf("Raw Name: %s\n", buf);
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/* Get Physical Location */
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res = ioctl(fd, HIDIOCGRAWPHYS(256), buf);
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if (res < 0)
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perror("HIDIOCGRAWPHYS");
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else
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printf("Raw Phys: %s\n", buf);
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/* Get Raw Info */
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res = ioctl(fd, HIDIOCGRAWINFO, &info);
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if (res < 0) {
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perror("HIDIOCGRAWINFO");
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} else {
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printf("Raw Info:\n");
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printf("\tbustype: %d (%s)\n",
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info.bustype, bus_str(info.bustype));
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printf("\tvendor: 0x%04hx\n", info.vendor);
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printf("\tproduct: 0x%04hx\n", info.product);
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}
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/* Set Feature */
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buf[0] = 0x9; /* Report Number */
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buf[1] = 0xff;
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buf[2] = 0xff;
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buf[3] = 0xff;
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res = ioctl(fd, HIDIOCSFEATURE(4), buf);
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if (res < 0)
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perror("HIDIOCSFEATURE");
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else
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printf("ioctl HIDIOCGFEATURE returned: %d\n", res);
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/* Get Feature */
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buf[0] = 0x9; /* Report Number */
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res = ioctl(fd, HIDIOCGFEATURE(256), buf);
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if (res < 0) {
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perror("HIDIOCGFEATURE");
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} else {
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printf("ioctl HIDIOCGFEATURE returned: %d\n", res);
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printf("Report data (not containing the report number):\n\t");
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for (i = 0; i < res; i++)
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printf("%hhx ", buf[i]);
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puts("\n");
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}
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/* Send a Report to the Device */
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buf[0] = 0x1; /* Report Number */
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buf[1] = 0x77;
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res = write(fd, buf, 2);
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if (res < 0) {
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printf("Error: %d\n", errno);
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perror("write");
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} else {
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printf("write() wrote %d bytes\n", res);
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}
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/* Get a report from the device */
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res = read(fd, buf, 16);
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if (res < 0) {
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perror("read");
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} else {
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printf("read() read %d bytes:\n\t", res);
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for (i = 0; i < res; i++)
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printf("%hhx ", buf[i]);
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puts("\n");
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}
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close(fd);
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return 0;
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}
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const char *
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bus_str(int bus)
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{
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switch (bus) {
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case BUS_USB:
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return "USB";
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break;
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case BUS_HIL:
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return "HIL";
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break;
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case BUS_BLUETOOTH:
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return "Bluetooth";
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break;
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case BUS_VIRTUAL:
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return "Virtual";
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break;
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default:
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return "Other";
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break;
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}
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}
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