basic amdgpu monitoring (#686)

* basic amdgpu monitoring

i3pystatus/amdgpu.py

@@ -0,0 +1,60 @@
+import os
+
+from i3pystatus import IntervalModule
+
+
+class Amdgpu(IntervalModule):
+    """
+    Shows information about gpu's using the amdgpu driver
+
+    .. rubric :: Available formatters
+
+    * `{temp}`
+    * `{sclk}`  - Gpu clock speed
+    * `{mclk}`  - Memory clock speed
+    """
+
+    settings = (
+        'format',
+        ('card', '[1, 2, ...] card to read (options are in /sys/class/drm/)')
+    )
+
+    card = 0
+    format = '{temp} {mclk} {sclk}'
+
+    def init(self):
+        self.dev_path = '/sys/class/drm/card{}/device/'.format(self.card)
+        self.detect_hwmon()
+
+    def detect_hwmon(self):
+        hwmon_base = self.dev_path + 'hwmon/'
+        self.hwmmon_path = hwmon_base + os.listdir(hwmon_base)[0] + '/'
+
+    def run(self):
+        self.data = dict(
+            sclk=self.get_sclk(),
+            mclk=self.get_mclk(),
+            temp=self.get_temp()
+        )
+
+        self.output = {
+            'full_text': self.format.format(**self.data)
+        }
+
+    @staticmethod
+    def parse_clk_reading(reading):
+        for l in reading.splitlines():
+            if l.endswith('*'):
+                return l.split(' ')[1]
+
+    def get_mclk(self):
+        with open(self.dev_path + 'pp_dpm_mclk') as f:
+            return self.parse_clk_reading(f.read())
+
+    def get_sclk(self):
+        with open(self.dev_path + 'pp_dpm_sclk') as f:
+            return self.parse_clk_reading(f.read())
+
+    def get_temp(self):
+        with open(self.hwmmon_path + 'temp1_input') as f:
+            return float(f.read()) / 1000