[PATCH v2 20/25] tests/functional: aspeed: add hwmon sensor read helpers

Add read_hwmon()/wait_hwmon_value() to AspeedTest so board tests can
read a sysfs hwmon attribute over the console and poll it until it
reaches an expected value, instead of each test carrying its own copy.

Signed-off-by: Emmanuel Blot <[email protected]>
---
 tests/functional/aspeed.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tests/functional/aspeed.py b/tests/functional/aspeed.py
index 08af6b4839..84d40fc0e9 100644
--- a/tests/functional/aspeed.py
+++ b/tests/functional/aspeed.py
@@ -2,6 +2,9 @@
 #
 # SPDX-License-Identifier: GPL-2.0-or-later
 
+import re
+import time
+
 from qemu_test import exec_command_and_wait_for_pattern
 from qemu_test import LinuxKernelTest
 
@@ -29,6 +32,19 @@ def do_test_arm_aspeed_openbmc(self, machine, image, uboot='2019.04',
     def wait_for_boot_complete(self):
         self.wait_for_console_pattern('login:')
 
+    def read_hwmon(self, hwmon, attr):
+        return exec_command_and_wait_for_pattern(
+            self, f'cat {hwmon}/{attr}', self.PROMPT)
+
+    def wait_hwmon_value(self, hwmon, attr, expected):
+        pattern = re.compile(rb'(?m)^%d\r*$' % expected)
+        if pattern.search(self.read_hwmon(hwmon, attr)):
+            return
+        time.sleep(2)
+        out = self.read_hwmon(hwmon, attr)
+        if not pattern.search(out):
+            self.fail(f'{attr} did not reach {expected}: {out!r}')
+
     def do_test_arm_aspeed_buildroot_start(self, image, cpu_id, pattern='Aspeed EVB'):
         self.require_netdev('user')
         self.vm.set_console()

-- 
2.50.1