Readme update.

Initialization of the device must be done after device is detached from
kernel, otherwise exception will be thrown about device is busy message.

README.rst

@@ -2,6 +2,9 @@
 Linak-ctrl
 ==========
 
+.. image:: https://badge.fury.io/py/linak-ctrl.svg
+   :target: https://badge.fury.io/py/linak-ctrl
+
 Simple python script to control Linak powered desks and USB2LIN06 cable.
 
 
@@ -14,6 +17,31 @@ Requirements
 * `pyusb`_
 
 
+Installation
+============
+
+There are couple of different ways for installing ``linak-ctrl``. One of the
+preferred ways is to use virtualenv and pip:
+
+.. code:: shell-session
+
+   $ git clone https://github.com/gryf/linak-ctrl
+   $ cd linak-ctrl
+   linak-ctrl $ python -m venv linak
+   (linak) linak-ctrl $ pip install .
+   (linak) linak-ctrl $ linak-ctrl status
+   Position: 767, height: 78.80cm, moving: False
+
+Or, you can install it system-wide:
+
+.. code:: shell-session
+
+   $ sudo pip install linak-ctrl
+
+And finally, you could also install dependences from your system repositories,
+and use script directly, by placing it somewhere in your ``$PATH``.
+
+
 Usage
 =====
 

linak_ctrl.py

@@ -112,6 +112,10 @@ class LinakDevice:
         self._dev = usb.core.find(idVendor=LinakDevice.VEND,
                                   idProduct=LinakDevice.PROD)
 
+        # detach kernel driver, if attached
+        if self._dev.is_kernel_driver_active(0):
+            self._dev.detach_kernel_driver(0)
+
         # init device
         buf = [0 for _ in range(BUF_LEN)]
         buf[0] = MODE_OF_OPERATION          # 0x03 Feature report ID = 3
@@ -123,25 +127,18 @@ class LinakDevice:
         # hold a little bit, to make it effect.
         time.sleep(0.5)
 
-        # detach kernel driver, if attached
-        if self._dev.is_kernel_driver_active(0):
-            self._dev.detach_kernel_driver(0)
-
     def get_position(self, args):
-        if args.loop:
-            try:
-                while True:
-                    report = self._get_report()
-                    LOG.warning('Position: %s, height: %.2fcm, moving: %s',
-                                report.position, report.position_in_cm,
-                                report.moving)
-                    time.sleep(0.2)
-            except KeyboardInterrupt:
-                return
-        else:
-            report = self._get_report()
-            LOG.warning('Position: %s, height: %.2fcm, moving: %s',
-                        report.position, report.position_in_cm, report.moving)
+        try:
+            while True:
+                report = self._get_report()
+                LOG.warning('Position: %s, height: %.2fcm, moving: %s',
+                            report.position, report.position_in_cm,
+                            report.moving)
+                if not args.loop:
+                    break
+                time.sleep(0.2)
+        except KeyboardInterrupt:
+            return
 
     def move(self, args):
         retry_count = 3

requirements.txt

@@ -0,0 +1,2 @@
+pbr
+pyusb>=1.1.1

setup.cfg

@@ -0,0 +1,34 @@
+[metadata]
+name = linak-ctrl
+summary = Control Linak powered desks using USB2LIN06 cable. 
+description-file = README.rst
+author = Roman Dobosz
+author-email = gryf73@gmail.com
+home-page = https://gihtub.com/gryf/linak-ctrl
+license = BSD
+classifier =
+    Development Status :: 5 - Production/Stable
+    Environment :: Console
+    Intended Audience :: End Users/Desktop
+    License :: OSI Approved :: BSD License
+    Operating System :: POSIX :: Linux
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Topic :: System :: Networking
+
+[install]
+record = install.log
+
+[options.entry_points]
+console_scripts =
+    linak-ctrl= linak_ctrl:main
+
+[options]
+install_requires =
+    pyusb
+
+[bdist_wheel]
+universal = 1

setup.py

@@ -0,0 +1,4 @@
+import setuptools
+
+
+setuptools.setup(setup_requires=['pbr>=2.0.0'], pbr=True)