diff options
Diffstat (limited to 'hidapi/linux')
| -rw-r--r-- | hidapi/linux/.gitignore | 18 | ||||
| -rw-r--r-- | hidapi/linux/Makefile-manual | 49 | ||||
| -rw-r--r-- | hidapi/linux/Makefile.am | 10 | ||||
| -rw-r--r-- | hidapi/linux/README.txt | 59 | ||||
| -rw-r--r-- | hidapi/linux/hid.c | 797 |
5 files changed, 933 insertions, 0 deletions
diff --git a/hidapi/linux/.gitignore b/hidapi/linux/.gitignore new file mode 100644 index 0000000..127bf37 --- /dev/null +++ b/hidapi/linux/.gitignore @@ -0,0 +1,18 @@ +Debug +Release +*.exp +*.ilk +*.lib +*.suo +*.vcproj.* +*.ncb +*.suo +*.dll +*.pdb +*.o +*.so +hidtest-hidraw +.deps +.libs +*.lo +*.la diff --git a/hidapi/linux/Makefile-manual b/hidapi/linux/Makefile-manual new file mode 100644 index 0000000..04ce1de --- /dev/null +++ b/hidapi/linux/Makefile-manual @@ -0,0 +1,49 @@ +########################################### +# Simple Makefile for HIDAPI test program +# +# Alan Ott +# Signal 11 Software +# 2010-06-01 +########################################### + +all: hidtest-hidraw libs + +libs: libhidapi-hidraw.so + +CC ?= gcc +CFLAGS ?= -Wall -g -fpic + +CXX ?= g++ +CXXFLAGS ?= -Wall -g -fpic + +LDFLAGS ?= -Wall -g + + +COBJS = hid.o +CPPOBJS = ../hidtest/hidtest.o +OBJS = $(COBJS) $(CPPOBJS) +LIBS_UDEV = `pkg-config libudev --libs` -lrt +LIBS = $(LIBS_UDEV) +INCLUDES ?= -I../hidapi `pkg-config libusb-1.0 --cflags` + + +# Console Test Program +hidtest-hidraw: $(COBJS) $(CPPOBJS) + $(CXX) $(LDFLAGS) $^ $(LIBS_UDEV) -o $@ + +# Shared Libs +libhidapi-hidraw.so: $(COBJS) + $(CC) $(LDFLAGS) $(LIBS_UDEV) -shared -fpic -Wl,-soname,$@.0 $^ -o $@ + +# Objects +$(COBJS): %.o: %.c + $(CC) $(CFLAGS) -c $(INCLUDES) $< -o $@ + +$(CPPOBJS): %.o: %.cpp + $(CXX) $(CXXFLAGS) -c $(INCLUDES) $< -o $@ + + +clean: + rm -f $(OBJS) hidtest-hidraw libhidapi-hidraw.so ../hidtest/hidtest.o + +.PHONY: clean libs diff --git a/hidapi/linux/Makefile.am b/hidapi/linux/Makefile.am new file mode 100644 index 0000000..230eeb7 --- /dev/null +++ b/hidapi/linux/Makefile.am @@ -0,0 +1,10 @@ +lib_LTLIBRARIES = libhidapi-hidraw.la +libhidapi_hidraw_la_SOURCES = hid.c +libhidapi_hidraw_la_LDFLAGS = $(LTLDFLAGS) +AM_CPPFLAGS = -I$(top_srcdir)/hidapi/ $(CFLAGS_HIDRAW) +libhidapi_hidraw_la_LIBADD = $(LIBS_HIDRAW) + +hdrdir = $(includedir)/hidapi +hdr_HEADERS = $(top_srcdir)/hidapi/hidapi.h + +EXTRA_DIST = Makefile-manual diff --git a/hidapi/linux/README.txt b/hidapi/linux/README.txt new file mode 100644 index 0000000..8006694 --- /dev/null +++ b/hidapi/linux/README.txt @@ -0,0 +1,59 @@ + +There are two implementations of HIDAPI for Linux. One (linux/hid.c) uses the +Linux hidraw driver, and the other (libusb/hid.c) uses libusb. Which one you +use depends on your application. Complete functionality of the hidraw +version depends on patches to the Linux kernel which are not currently in +the mainline. These patches have to do with sending and receiving feature +reports. The libusb implementation uses libusb to talk directly to the +device, bypassing any Linux HID driver. The disadvantage of the libusb +version is that it will only work with USB devices, while the hidraw +implementation will work with Bluetooth devices as well. + +To use HIDAPI, simply drop either linux/hid.c or libusb/hid.c into your +application and build using the build parameters in the Makefile. + + +Libusb Implementation notes +---------------------------- +For the libusb implementation, libusb-1.0 must be installed. Libusb 1.0 is +different than the legacy libusb 0.1 which is installed on many systems. To +install libusb-1.0 on Ubuntu and other Debian-based systems, run: + sudo apt-get install libusb-1.0-0-dev + + +Hidraw Implementation notes +---------------------------- +For the hidraw implementation, libudev headers and libraries are required to +build hidapi programs. To install libudev libraries on Ubuntu, +and other Debian-based systems, run: + sudo apt-get install libudev-dev + +On Redhat-based systems, run the following as root: + yum install libudev-devel + +Unfortunately, the hidraw driver, which the linux version of hidapi is based +on, contains bugs in kernel versions < 2.6.36, which the client application +should be aware of. + +Bugs (hidraw implementation only): +----------------------------------- +On Kernel versions < 2.6.34, if your device uses numbered reports, an extra +byte will be returned at the beginning of all reports returned from read() +for hidraw devices. This is worked around in the libary. No action should be +necessary in the client library. + +On Kernel versions < 2.6.35, reports will only be sent using a Set_Report +transfer on the CONTROL endpoint. No data will ever be sent on an Interrupt +Out endpoint if one exists. This is fixed in 2.6.35. In 2.6.35, OUTPUT +reports will be sent to the device on the first INTERRUPT OUT endpoint if it +exists; If it does not exist, OUTPUT reports will be sent on the CONTROL +endpoint. + +On Kernel versions < 2.6.36, add an extra byte containing the report number +to sent reports if numbered reports are used, and the device does not +contain an INTERRPUT OUT endpoint for OUTPUT transfers. For example, if +your device uses numbered reports and wants to send {0x2 0xff 0xff 0xff} to +the device (0x2 is the report number), you must send {0x2 0x2 0xff 0xff +0xff}. If your device has the optional Interrupt OUT endpoint, this does not +apply (but really on 2.6.35 only, because 2.6.34 won't use the interrupt +out endpoint). diff --git a/hidapi/linux/hid.c b/hidapi/linux/hid.c new file mode 100644 index 0000000..56dac0f --- /dev/null +++ b/hidapi/linux/hid.c @@ -0,0 +1,797 @@ +/******************************************************* + HIDAPI - Multi-Platform library for + communication with HID devices. + + Alan Ott + Signal 11 Software + + 8/22/2009 + Linux Version - 6/2/2009 + + Copyright 2009, All Rights Reserved. + + At the discretion of the user of this library, + this software may be licensed under the terms of the + GNU General Public License v3, a BSD-Style license, or the + original HIDAPI license as outlined in the LICENSE.txt, + LICENSE-gpl3.txt, LICENSE-bsd.txt, and LICENSE-orig.txt + files located at the root of the source distribution. + These files may also be found in the public source + code repository located at: + http://github.com/signal11/hidapi . +********************************************************/ + +/* C */ +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <locale.h> +#include <errno.h> + +/* Unix */ +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <sys/utsname.h> +#include <fcntl.h> +#include <poll.h> + +/* Linux */ +#include <linux/hidraw.h> +#include <linux/version.h> +#include <linux/input.h> +#include <libudev.h> + +#include "hidapi.h" + +/* Definitions from linux/hidraw.h. Since these are new, some distros + may not have header files which contain them. */ +#ifndef HIDIOCSFEATURE +#define HIDIOCSFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x06, len) +#endif +#ifndef HIDIOCGFEATURE +#define HIDIOCGFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x07, len) +#endif + + +/* USB HID device property names */ +const char *device_string_names[] = { + "manufacturer", + "product", + "serial", +}; + +/* Symbolic names for the properties above */ +enum device_string_id { + DEVICE_STRING_MANUFACTURER, + DEVICE_STRING_PRODUCT, + DEVICE_STRING_SERIAL, + + DEVICE_STRING_COUNT, +}; + +struct hid_device_ { + int device_handle; + int blocking; + int uses_numbered_reports; +}; + + +static __u32 kernel_version = 0; + +static __u32 detect_kernel_version(void) +{ + struct utsname name; + int major, minor, release; + int ret; + + uname(&name); + ret = sscanf(name.release, "%d.%d.%d", &major, &minor, &release); + if (ret == 3) { + return KERNEL_VERSION(major, minor, release); + } + + ret = sscanf(name.release, "%d.%d", &major, &minor); + if (ret == 2) { + return KERNEL_VERSION(major, minor, 0); + } + + printf("Couldn't determine kernel version from version string \"%s\"\n", name.release); + return 0; +} + +static hid_device *new_hid_device(void) +{ + hid_device *dev = calloc(1, sizeof(hid_device)); + dev->device_handle = -1; + dev->blocking = 1; + dev->uses_numbered_reports = 0; + + return dev; +} + + +/* The caller must free the returned string with free(). */ +static wchar_t *utf8_to_wchar_t(const char *utf8) +{ + wchar_t *ret = NULL; + + if (utf8) { + size_t wlen = mbstowcs(NULL, utf8, 0); + if ((size_t) -1 == wlen) { + return wcsdup(L""); + } + ret = calloc(wlen+1, sizeof(wchar_t)); + mbstowcs(ret, utf8, wlen+1); + ret[wlen] = 0x0000; + } + + return ret; +} + +/* Get an attribute value from a udev_device and return it as a whar_t + string. The returned string must be freed with free() when done.*/ +static wchar_t *copy_udev_string(struct udev_device *dev, const char *udev_name) +{ + return utf8_to_wchar_t(udev_device_get_sysattr_value(dev, udev_name)); +} + +/* uses_numbered_reports() returns 1 if report_descriptor describes a device + which contains numbered reports. */ +static int uses_numbered_reports(__u8 *report_descriptor, __u32 size) { + unsigned int i = 0; + int size_code; + int data_len, key_size; + + while (i < size) { + int key = report_descriptor[i]; + + /* Check for the Report ID key */ + if (key == 0x85/*Report ID*/) { + /* This device has a Report ID, which means it uses + numbered reports. */ + return 1; + } + + //printf("key: %02hhx\n", key); + + if ((key & 0xf0) == 0xf0) { + /* This is a Long Item. The next byte contains the + length of the data section (value) for this key. + See the HID specification, version 1.11, section + 6.2.2.3, titled "Long Items." */ + if (i+1 < size) + data_len = report_descriptor[i+1]; + else + data_len = 0; /* malformed report */ + key_size = 3; + } + else { + /* This is a Short Item. The bottom two bits of the + key contain the size code for the data section + (value) for this key. Refer to the HID + specification, version 1.11, section 6.2.2.2, + titled "Short Items." */ + size_code = key & 0x3; + switch (size_code) { + case 0: + case 1: + case 2: + data_len = size_code; + break; + case 3: + data_len = 4; + break; + default: + /* Can't ever happen since size_code is & 0x3 */ + data_len = 0; + break; + }; + key_size = 1; + } + + /* Skip over this key and it's associated data */ + i += data_len + key_size; + } + + /* Didn't find a Report ID key. Device doesn't use numbered reports. */ + return 0; +} + +/* + * The caller is responsible for free()ing the (newly-allocated) character + * strings pointed to by serial_number_utf8 and product_name_utf8 after use. + */ +static int +parse_uevent_info(const char *uevent, int *bus_type, + unsigned short *vendor_id, unsigned short *product_id, + char **serial_number_utf8, char **product_name_utf8) +{ + char *tmp = strdup(uevent); + char *saveptr = NULL; + char *line; + char *key; + char *value; + + int found_id = 0; + int found_serial = 0; + int found_name = 0; + + line = strtok_r(tmp, "\n", &saveptr); + while (line != NULL) { + /* line: "KEY=value" */ + key = line; + value = strchr(line, '='); + if (!value) { + goto next_line; + } + *value = '\0'; + value++; + + if (strcmp(key, "HID_ID") == 0) { + /** + * type vendor product + * HID_ID=0003:000005AC:00008242 + **/ + int ret = sscanf(value, "%x:%hx:%hx", bus_type, vendor_id, product_id); + if (ret == 3) { + found_id = 1; + } + } else if (strcmp(key, "HID_NAME") == 0) { + /* The caller has to free the product name */ + *product_name_utf8 = strdup(value); + found_name = 1; + } else if (strcmp(key, "HID_UNIQ") == 0) { + /* The caller has to free the serial number */ + *serial_number_utf8 = strdup(value); + found_serial = 1; + } + +next_line: + line = strtok_r(NULL, "\n", &saveptr); + } + + free(tmp); + return (found_id && found_name && found_serial); +} + + +static int get_device_string(hid_device *dev, enum device_string_id key, wchar_t *string, size_t maxlen) +{ + struct udev *udev; + struct udev_device *udev_dev, *parent, *hid_dev; + struct stat s; + int ret = -1; + char *serial_number_utf8 = NULL; + char *product_name_utf8 = NULL; + + /* Create the udev object */ + udev = udev_new(); + if (!udev) { + printf("Can't create udev\n"); + return -1; + } + + /* Get the dev_t (major/minor numbers) from the file handle. */ + ret = fstat(dev->device_handle, &s); + if (-1 == ret) + return ret; + /* Open a udev device from the dev_t. 'c' means character device. */ + udev_dev = udev_device_new_from_devnum(udev, 'c', s.st_rdev); + if (udev_dev) { + hid_dev = udev_device_get_parent_with_subsystem_devtype( + udev_dev, + "hid", + NULL); + if (hid_dev) { + unsigned short dev_vid; + unsigned short dev_pid; + int bus_type; + size_t retm; + + ret = parse_uevent_info( + udev_device_get_sysattr_value(hid_dev, "uevent"), + &bus_type, + &dev_vid, + &dev_pid, + &serial_number_utf8, + &product_name_utf8); + + if (bus_type == BUS_BLUETOOTH) { + switch (key) { + case DEVICE_STRING_MANUFACTURER: + wcsncpy(string, L"", maxlen); + ret = 0; + break; + case DEVICE_STRING_PRODUCT: + retm = mbstowcs(string, product_name_utf8, maxlen); + ret = (retm == (size_t)-1)? -1: 0; + break; + case DEVICE_STRING_SERIAL: + retm = mbstowcs(string, serial_number_utf8, maxlen); + ret = (retm == (size_t)-1)? -1: 0; + break; + case DEVICE_STRING_COUNT: + default: + ret = -1; + break; + } + } + else { + /* This is a USB device. Find its parent USB Device node. */ + parent = udev_device_get_parent_with_subsystem_devtype( + udev_dev, + "usb", + "usb_device"); + if (parent) { + const char *str; + const char *key_str = NULL; + + if (key >= 0 && key < DEVICE_STRING_COUNT) { + key_str = device_string_names[key]; + } else { + ret = -1; + goto end; + } + + str = udev_device_get_sysattr_value(parent, key_str); + if (str) { + /* Convert the string from UTF-8 to wchar_t */ + retm = mbstowcs(string, str, maxlen); + ret = (retm == (size_t)-1)? -1: 0; + goto end; + } + } + } + } + } + +end: + free(serial_number_utf8); + free(product_name_utf8); + + udev_device_unref(udev_dev); + /* parent and hid_dev don't need to be (and can't be) unref'd. + I'm not sure why, but they'll throw double-free() errors. */ + udev_unref(udev); + + return ret; +} + +int HID_API_EXPORT hid_init(void) +{ + const char *locale; + + /* Set the locale if it's not set. */ + locale = setlocale(LC_CTYPE, NULL); + if (!locale) + setlocale(LC_CTYPE, ""); + + kernel_version = detect_kernel_version(); + + return 0; +} + +int HID_API_EXPORT hid_exit(void) +{ + /* Nothing to do for this in the Linux/hidraw implementation. */ + return 0; +} + + +struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, unsigned short product_id) +{ + struct udev *udev; + struct udev_enumerate *enumerate; + struct udev_list_entry *devices, *dev_list_entry; + + struct hid_device_info *root = NULL; /* return object */ + struct hid_device_info *cur_dev = NULL; + struct hid_device_info *prev_dev = NULL; /* previous device */ + + hid_init(); + + /* Create the udev object */ + udev = udev_new(); + if (!udev) { + printf("Can't create udev\n"); + return NULL; + } + + /* Create a list of the devices in the 'hidraw' subsystem. */ + enumerate = udev_enumerate_new(udev); + udev_enumerate_add_match_subsystem(enumerate, "hidraw"); + udev_enumerate_scan_devices(enumerate); + devices = udev_enumerate_get_list_entry(enumerate); + /* For each item, see if it matches the vid/pid, and if so + create a udev_device record for it */ + udev_list_entry_foreach(dev_list_entry, devices) { + const char *sysfs_path; + const char *dev_path; + const char *str; + struct udev_device *raw_dev; /* The device's hidraw udev node. */ + struct udev_device *hid_dev; /* The device's HID udev node. */ + struct udev_device *usb_dev; /* The device's USB udev node. */ + struct udev_device *intf_dev; /* The device's interface (in the USB sense). */ + unsigned short dev_vid; + unsigned short dev_pid; + char *serial_number_utf8 = NULL; + char *product_name_utf8 = NULL; + int bus_type; + int result; + + /* Get the filename of the /sys entry for the device + and create a udev_device object (dev) representing it */ + sysfs_path = udev_list_entry_get_name(dev_list_entry); + raw_dev = udev_device_new_from_syspath(udev, sysfs_path); + dev_path = udev_device_get_devnode(raw_dev); + + hid_dev = udev_device_get_parent_with_subsystem_devtype( + raw_dev, + "hid", + NULL); + + if (!hid_dev) { + /* Unable to find parent hid device. */ + goto next; + } + + result = parse_uevent_info( + udev_device_get_sysattr_value(hid_dev, "uevent"), + &bus_type, + &dev_vid, + &dev_pid, + &serial_number_utf8, + &product_name_utf8); + + if (!result) { + /* parse_uevent_info() failed for at least one field. */ + goto next; + } + + if (bus_type != BUS_USB && bus_type != BUS_BLUETOOTH) { + /* We only know how to handle USB and BT devices. */ + goto next; + } + + /* Check the VID/PID against the arguments */ + if ((vendor_id == 0x0 || vendor_id == dev_vid) && + (product_id == 0x0 || product_id == dev_pid)) { + struct hid_device_info *tmp; + + /* VID/PID match. Create the record. */ + tmp = malloc(sizeof(struct hid_device_info)); + if (cur_dev) { + cur_dev->next = tmp; + } + else { + root = tmp; + } + prev_dev = cur_dev; + cur_dev = tmp; + + /* Fill out the record */ + cur_dev->next = NULL; + cur_dev->path = dev_path? strdup(dev_path): NULL; + + /* VID/PID */ + cur_dev->vendor_id = dev_vid; + cur_dev->product_id = dev_pid; + + /* Serial Number */ + cur_dev->serial_number = utf8_to_wchar_t(serial_number_utf8); + + /* Release Number */ + cur_dev->release_number = 0x0; + + /* Interface Number */ + cur_dev->interface_number = -1; + + switch (bus_type) { + case BUS_USB: + /* The device pointed to by raw_dev contains information about + the hidraw device. In order to get information about the + USB device, get the parent device with the + subsystem/devtype pair of "usb"/"usb_device". This will + be several levels up the tree, but the function will find + it. */ + usb_dev = udev_device_get_parent_with_subsystem_devtype( + raw_dev, + "usb", + "usb_device"); + + if (!usb_dev) { + /* Free this device */ + free(cur_dev->serial_number); + free(cur_dev->path); + free(cur_dev); + + /* Take it off the device list. */ + if (prev_dev) { + prev_dev->next = NULL; + cur_dev = prev_dev; + } + else { + cur_dev = root = NULL; + } + + goto next; + } + + /* Manufacturer and Product strings */ + cur_dev->manufacturer_string = copy_udev_string(usb_dev, device_string_names[DEVICE_STRING_MANUFACTURER]); + cur_dev->product_string = copy_udev_string(usb_dev, device_string_names[DEVICE_STRING_PRODUCT]); + + /* Release Number */ + str = udev_device_get_sysattr_value(usb_dev, "bcdDevice"); + cur_dev->release_number = (str)? strtol(str, NULL, 16): 0x0; + + /* Get a handle to the interface's udev node. */ + intf_dev = udev_device_get_parent_with_subsystem_devtype( + raw_dev, + "usb", + "usb_interface"); + if (intf_dev) { + str = udev_device_get_sysattr_value(intf_dev, "bInterfaceNumber"); + cur_dev->interface_number = (str)? strtol(str, NULL, 16): -1; + } + + break; + + case BUS_BLUETOOTH: + /* Manufacturer and Product strings */ + cur_dev->manufacturer_string = wcsdup(L""); + cur_dev->product_string = utf8_to_wchar_t(product_name_utf8); + + break; + + default: + /* Unknown device type - this should never happen, as we + * check for USB and Bluetooth devices above */ + break; + } + } + + next: + free(serial_number_utf8); + free(product_name_utf8); + udev_device_unref(raw_dev); + /* hid_dev, usb_dev and intf_dev don't need to be (and can't be) + unref()d. It will cause a double-free() error. I'm not + sure why. */ + } + /* Free the enumerator and udev objects. */ + udev_enumerate_unref(enumerate); + udev_unref(udev); + + return root; +} + +void HID_API_EXPORT hid_free_enumeration(struct hid_device_info *devs) +{ + struct hid_device_info *d = devs; + while (d) { + struct hid_device_info *next = d->next; + free(d->path); + free(d->serial_number); + free(d->manufacturer_string); + free(d->product_string); + free(d); + d = next; + } +} + +hid_device * hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number) +{ + struct hid_device_info *devs, *cur_dev; + const char *path_to_open = NULL; + hid_device *handle = NULL; + + devs = hid_enumerate(vendor_id, product_id); + cur_dev = devs; + while (cur_dev) { + if (cur_dev->vendor_id == vendor_id && + cur_dev->product_id == product_id) { + if (serial_number) { + if (wcscmp(serial_number, cur_dev->serial_number) == 0) { + path_to_open = cur_dev->path; + break; + } + } + else { + path_to_open = cur_dev->path; + break; + } + } + cur_dev = cur_dev->next; + } + + if (path_to_open) { + /* Open the device */ + handle = hid_open_path(path_to_open); + } + + hid_free_enumeration(devs); + + return handle; +} + +hid_device * HID_API_EXPORT hid_open_path(const char *path) +{ + hid_device *dev = NULL; + + hid_init(); + + dev = new_hid_device(); + + /* OPEN HERE */ + dev->device_handle = open(path, O_RDWR); + + /* If we have a good handle, return it. */ + if (dev->device_handle > 0) { + + /* Get the report descriptor */ + int res, desc_size = 0; + struct hidraw_report_descriptor rpt_desc; + + memset(&rpt_desc, 0x0, sizeof(rpt_desc)); + + /* Get Report Descriptor Size */ + res = ioctl(dev->device_handle, HIDIOCGRDESCSIZE, &desc_size); + if (res < 0) + perror("HIDIOCGRDESCSIZE"); + + + /* Get Report Descriptor */ + rpt_desc.size = desc_size; + res = ioctl(dev->device_handle, HIDIOCGRDESC, &rpt_desc); + if (res < 0) { + perror("HIDIOCGRDESC"); + } else { + /* Determine if this device uses numbered reports. */ + dev->uses_numbered_reports = + uses_numbered_reports(rpt_desc.value, + rpt_desc.size); + } + + return dev; + } + else { + /* Unable to open any devices. */ + free(dev); + return NULL; + } +} + + +int HID_API_EXPORT hid_write(hid_device *dev, const unsigned char *data, size_t length) +{ + int bytes_written; + + bytes_written = write(dev->device_handle, data, length); + + return bytes_written; +} + + +int HID_API_EXPORT hid_read_timeout(hid_device *dev, unsigned char *data, size_t length, int milliseconds) +{ + int bytes_read; + + if (milliseconds >= 0) { + /* Milliseconds is either 0 (non-blocking) or > 0 (contains + a valid timeout). In both cases we want to call poll() + and wait for data to arrive. Don't rely on non-blocking + operation (O_NONBLOCK) since some kernels don't seem to + properly report device disconnection through read() when + in non-blocking mode. */ + int ret; + struct pollfd fds; + + fds.fd = dev->device_handle; + fds.events = POLLIN; + fds.revents = 0; + ret = poll(&fds, 1, milliseconds); + if (ret == -1 || ret == 0) { + /* Error or timeout */ + return ret; + } + else { + /* Check for errors on the file descriptor. This will + indicate a device disconnection. */ + if (fds.revents & (POLLERR | POLLHUP | POLLNVAL)) + return -1; + } + } + + bytes_read = read(dev->device_handle, data, length); + if (bytes_read < 0 && (errno == EAGAIN || errno == EINPROGRESS)) + bytes_read = 0; + + if (bytes_read >= 0 && + kernel_version != 0 && + kernel_version < KERNEL_VERSION(2,6,34) && + dev->uses_numbered_reports) { + /* Work around a kernel bug. Chop off the first byte. */ + memmove(data, data+1, bytes_read); + bytes_read--; + } + + return bytes_read; +} + +int HID_API_EXPORT hid_read(hid_device *dev, unsigned char *data, size_t length) +{ + return hid_read_timeout(dev, data, length, (dev->blocking)? -1: 0); +} + +int HID_API_EXPORT hid_set_nonblocking(hid_device *dev, int nonblock) +{ + /* Do all non-blocking in userspace using poll(), since it looks + like there's a bug in the kernel in some versions where + read() will not return -1 on disconnection of the USB device */ + + dev->blocking = !nonblock; + return 0; /* Success */ +} + + +int HID_API_EXPORT hid_send_feature_report(hid_device *dev, const unsigned char *data, size_t length) +{ + int res; + + res = ioctl(dev->device_handle, HIDIOCSFEATURE(length), data); + if (res < 0) + perror("ioctl (SFEATURE)"); + + return res; +} + +int HID_API_EXPORT hid_get_feature_report(hid_device *dev, unsigned char *data, size_t length) +{ + int res; + + res = ioctl(dev->device_handle, HIDIOCGFEATURE(length), data); + if (res < 0) + perror("ioctl (GFEATURE)"); + + + return res; +} + + +void HID_API_EXPORT hid_close(hid_device *dev) +{ + if (!dev) + return; + close(dev->device_handle); + free(dev); +} + + +int HID_API_EXPORT_CALL hid_get_manufacturer_string(hid_device *dev, wchar_t *string, size_t maxlen) +{ + return get_device_string(dev, DEVICE_STRING_MANUFACTURER, string, maxlen); +} + +int HID_API_EXPORT_CALL hid_get_product_string(hid_device *dev, wchar_t *string, size_t maxlen) +{ + return get_device_string(dev, DEVICE_STRING_PRODUCT, string, maxlen); +} + +int HID_API_EXPORT_CALL hid_get_serial_number_string(hid_device *dev, wchar_t *string, size_t maxlen) +{ + return get_device_string(dev, DEVICE_STRING_SERIAL, string, maxlen); +} + +int HID_API_EXPORT_CALL hid_get_indexed_string(hid_device *dev, int string_index, wchar_t *string, size_t maxlen) +{ + return -1; +} + + +HID_API_EXPORT const wchar_t * HID_API_CALL hid_error(hid_device *dev) +{ + return NULL; +} |