/usr/lib/python2.7/dist-packages/hidapi.py is in python-hidapi 0.2.1-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 | from cffi import FFI
ffi = FFI()
ffi.cdef("""
struct hid_device_;
typedef struct hid_device_ hid_device;
struct hid_device_info {
char *path;
unsigned short vendor_id;
unsigned short product_id;
wchar_t *serial_number;
unsigned short release_number;
wchar_t *manufacturer_string;
wchar_t *product_string;
unsigned short usage_page;
unsigned short usage;
int interface_number;
struct hid_device_info *next;
};
int hid_init(void);
int hid_exit(void);
struct hid_device_info* hid_enumerate(unsigned short vendor_id,
unsigned short product_id);
void hid_free_enumeration(struct hid_device_info *devs);
hid_device* hid_open(unsigned short vendor_id, unsigned short product_id,
const wchar_t *serial_number);
hid_device* hid_open_path(const char *path);
int hid_write(hid_device *device, const unsigned char *data, size_t length);
int hid_read_timeout(hid_device *dev, unsigned char *data, size_t length,
int milliseconds);
int hid_read(hid_device *device, unsigned char *data, size_t length);
int hid_set_nonblocking(hid_device *device, int nonblock);
int hid_send_feature_report(hid_device *device, const unsigned char *data,
size_t length);
int hid_get_feature_report(hid_device *device, unsigned char *data,
size_t length);
void hid_close(hid_device *device);
int hid_get_manufacturer_string(hid_device *device, wchar_t *string,
size_t maxlen);
int hid_get_product_string(hid_device *device, wchar_t *string,
size_t maxlen);
int hid_get_serial_number_string(hid_device *device, wchar_t *string,
size_t maxlen);
int hid_get_indexed_string(hid_device *device, int string_index,
wchar_t *string, size_t maxlen);
const wchar_t* hid_error(hid_device *device);
""")
for lib in ('hidapi-libusb', 'hidapi-hidraw', 'hidapi'):
try:
hidapi = ffi.dlopen(lib)
break
except OSError:
pass
else:
raise OSError("Could not find any hidapi library")
if hidapi.hid_init() == -1:
raise OSError("Failed to initialize hidapi")
class DeviceInfo(object):
__slots__ = ['path', 'vendor_id', 'product_id', 'serial_number',
'release_number', 'manufacturer_string', 'product_string',
'usage_page', 'usage', 'interface_number']
def __init__(self, info_struct):
#: Platform-specific device path
self.path = ffi.string(info_struct.path)
#: Device Vendor ID
self.vendor_id = info_struct.vendor_id
#: Device Product ID
self.product_id = info_struct.product_id
#: Serial Number
self.serial_number = (ffi.string(info_struct.serial_number)
if info_struct.serial_number else None)
#: Device Release Number in binary-coded decimal, also known as
# Device Version Number
self.release_number = info_struct.release_number
#: Manufacturer String
self.manufacturer_string = (ffi.string(info_struct.manufacturer_string)
if info_struct.manufacturer_string
else None)
#: Product string
self.product_string = (ffi.string(info_struct.product_string)
if info_struct.product_string else None)
#: Usage Page for this Device/Interface (Windows/Mac only).
self.usage_page = info_struct.usage_page or None
#: Usage for this Device/Interface (Windows/Mac only).
self.usage = info_struct.usage or None
#: The USB interface which this logical device represents. Valid on
# both Linux implementations in all cases, and valid on the Windows
# implementation only if the device contains more than one interface.
self.interface_number = info_struct.interface_number
def enumerate(vendor_id=0, product_id=0):
""" Enumerate the HID Devices.
Returns a generator that yields all of the HID devices attached to the
system.
:param vendor_id: Only return devices which match this vendor id
:type vendor_id: int
:param product_id: Only return devices which match this product id
:type product_id: int
:return: Generator that yields informations about attached
HID devices
:rval: generator(DeviceInfo)
"""
info = hidapi.hid_enumerate(vendor_id, product_id)
while info:
yield DeviceInfo(info)
info = info.next
hidapi.hid_free_enumeration(info)
class Device(object):
def __init__(self, info=None, path=None, vendor_id=None, product_id=None,
serial_number=None, blocking=True):
""" Open a connection to a HID device.
This can be done either from a DeviceInfo object, a device path or
a combination of vendor id, product id and an optional serial number.
If no serial number is passed, the first matching device will be
selected.
By setting :param blocking: to True, all reads will be blocking by
default, otherwise they will return `None` if no data is available.
:param info: Information about the device to initialize
:type info: DeviceInfo
:param path: Platform-specific path to the device (e.g.
`/dev/hidraw0` on Linux)
:type path: str
:param vendor_id: Vendor ID
:type vendor_id: int
:param product_id: Product ID
:type product_id: int
:param serial_number: Device serial number
:type serial_number: str
:param blocking: Enable blocking reads by default
:type blocking: boolean
"""
if info is not None:
self._device = hidapi.hid_open_path(info.path)
elif path is not None:
self._device = hidapi.hid_open_path(path)
elif not (vendor_id is None or product_id is None):
self._device = hidapi.hid_open(vendor_id, product_id,
serial_number)
else:
raise ValueError("Must provide either a DeviceInfo object, 'path' "
"or 'vendor_id' and 'product_id'.")
if self._device == ffi.NULL:
raise IOError("Could not open connection to device.")
if not blocking:
hidapi.hid_set_nonblocking(self._device, 1)
def __del__(self):
if self._device is not None:
self.close()
def write(self, data, report_id=b'\0'):
""" Write an Output report to a HID device.
This will send the data on the first OUT endpoint, if one exists. If it
does not, it will be sent the data through the Control Endpoint
(Endpoint 0).
:param data: The data to be sent
:type data: str/bytes
:param report_id: The Report ID to write to (default: 0x0)
"""
self._check_device_status()
bufp = ffi.new("unsigned char[]", len(data)+1)
buf = ffi.buffer(bufp, len(data)+1)
buf[0] = report_id
buf[1:] = data
rv = hidapi.hid_write(self._device, bufp, len(data)+1)
if rv == -1:
raise IOError("Failed to write to HID device.")
def read(self, length, timeout_ms=0, blocking=False):
""" Read an Input report from a HID device with timeout.
Input reports are returned to the host through the `INTERRUPT IN`
endpoint. The first byte will contain the Report number if the device
uses numbered reports.
By default reads are non-blocking, i.e. the method will return
`None` if no data was available. Blocking reads can be enabled with
:param blocking:. Additionally, a timeout for the read can be
specified.
:param length: The number of bytes to read. For devices with
multiple reports, make sure to read an extra byte
for the report number.
:param timeout_ms: Timeout in miliseconds
:type timeout_ms: int
:param blocking: Block until data is available
"""
self._check_device_status()
bufp = ffi.new("unsigned char[]", length)
if not timeout_ms and blocking:
timeout_ms = -1
if timeout_ms:
rv = hidapi.hid_read_timeout(self._device, bufp, length,
timeout_ms)
else:
rv = hidapi.hid_read(self._device, bufp, length)
if rv == -1:
raise IOError("Failed to read from HID device: {0}"
.format(self._get_last_error_string()))
elif rv == 0:
return None
else:
return ffi.buffer(bufp, rv)[:]
def get_manufacturer_string(self):
""" Get the Manufacturer String from the HID device.
:return: The Manufacturer String
:rtype: unicode
"""
self._check_device_status()
str_p = ffi.new("wchar_t[]", 255)
rv = hidapi.hid_get_manufacturer_string(self._device, str_p, 255)
if rv == -1:
raise IOError("Failed to read manufacturer string from HID "
"device: {0}".format(self._get_last_error_string()))
return ffi.string(str_p)
def get_product_string(self):
""" Get the Product String from the HID device.
:return: The Product String
:rtype: unicode
"""
self._check_device_status()
str_p = ffi.new("wchar_t[]", 255)
rv = hidapi.hid_get_product_string(self._device, str_p, 255)
if rv == -1:
raise IOError("Failed to read product string from HID device: {0}"
.format(self._get_last_error_string()))
return ffi.string(str_p)
def get_serial_number_string(self):
""" Get the Serial Number String from the HID device.
:return: The Serial Number String
:rtype: unicode
"""
self._check_device_status()
str_p = ffi.new("wchar_t[]", 255)
rv = hidapi.hid_get_serial_number_string(self._device, str_p, 255)
if rv == -1:
raise IOError("Failed to read serial number string from HID "
"device: {0}".format(self._get_last_error_string()))
return ffi.string(str_p)
def send_feature_report(self, data, report_id=0x0):
""" Send a Feature report to the device.
Feature reports are sent over the Control endpoint as a Set_Report
transfer.
:param data: The data to send
:type data: str/bytes
:param report_id: The Report ID to send to
:type report_id: int
"""
self._check_device_status()
bufp = ffi.new("unsigned char[]", len(data)+1)
buf = ffi.buffer(bufp, len(data)+1)
buf[0] = report_id
buf[1:] = data
rv = hidapi.hid_send_feature_report(self._device, bufp, len(data))
if rv == -1:
raise IOError("Failed to send feature report to HID device: {0}"
.format(self._get_last_error_string()))
def get_feature_report(self, report_id, length):
""" Get a feature report from the device.
:param report_id: The Report ID of the report to be read
:type report_id: int
:return: The report data
:rtype: str/bytes
"""
self._check_device_status()
bufp = ffi.new("unsigned char[]", length+1)
buf = ffi.buffer(bufp, length+1)
buf[0] = report_id
rv = hidapi.hid_get_feature_report(self._device, bufp, length+1)
if rv == -1:
raise IOError("Failed to get feature report from HID device: {0}"
.format(self._get_last_error_string()))
return buf[1:]
def get_indexed_string(self, idx):
""" Get a string from the device, based on its string index.
:param idx: The index of the string to get
:type idx: int
:return: The string at the index
:rtype: unicode
"""
self._check_device_status()
bufp = ffi.new("wchar_t*")
rv = hidapi.hid_get_indexed_string(self._device, idx, bufp, 65536)
if rv == -1:
raise IOError("Failed to read string with index {0} from HID "
"device: {0}"
.format(idx, self._get_last_error_string()))
return ffi.buffer(bufp, 65536)[:].strip()
def close(self):
""" Close connection to HID device.
Automatically run when a Device object is garbage-collected, though
manual invocation is recommended.
"""
self._check_device_status()
hidapi.hid_close(self._device)
self._device = None
def _get_last_error_string(self):
errstr_p = ffi.new("wchar_t*")
rv = hidapi.hid_error(self._device)
if rv is ffi.NULL:
return None
return ffi.string(errstr_p)
def _check_device_status(self):
if self._device is None:
raise OSError("Trying to perform action on closed device.")
|