From 650ec84b3e2dcda0110a90d0b66a1e38b228fe97 Mon Sep 17 00:00:00 2001
From: Andrew Sorensen <andrew@andrewsorensen.net>
Date: Sat, 9 Apr 2016 22:03:01 -0700
Subject: [PATCH] Initial version

---
 README.md     | 41 ++++++++++++++++++++++++++++++++++++++++-
 fancontrol.py | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 91 insertions(+), 1 deletion(-)
 create mode 100644 fancontrol.py

diff --git a/README.md b/README.md
index b989033..f8796bb 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,40 @@
-# lenovo-sa120-fanspeed-utility
\ No newline at end of file
+# lenovo-sa120-fanspeed-utility
+
+This is currently in prototype status.
+
+## Requirements
+
+apt-get install sg3-utils
+
+## Usage
+
+find your scsi controller (one of the /dev/sgX devices, perhaps using lsscsi)
+
+change /dev/sgX in fanspeed.py if needed.
+
+````
+# python fan.py 2
+Fan 0 speed: 0
+Fan 1 speed: 947
+Fan 2 speed: 932
+Fan 3 speed: 812
+Fan 4 speed: 932
+Fan 5 speed: 947
+Reading current configuration...
+Setting fan 0 to 2
+Setting fan 1 to 2
+Setting fan 2 to 2
+Setting fan 3 to 2
+Setting fan 4 to 2
+Setting fan 5 to 2
+  LENOVO    ThinkServerSA120  1007
+Sending Enclosure Control [0x2] page, with page length=296 bytes
+
+Fan 0 speed: 0
+Fan 1 speed: 945
+Fan 2 speed: 932
+Fan 3 speed: 812
+Fan 4 speed: 926
+Fan 5 speed: 945
+
+````
diff --git a/fancontrol.py b/fancontrol.py
new file mode 100644
index 0000000..088364b
--- /dev/null
+++ b/fancontrol.py
@@ -0,0 +1,51 @@
+import sys
+import time
+try:
+    from StringIO import StringIO
+except ImportError:
+    from io import StringIO
+from subprocess import check_output
+
+def print_speeds():
+  for i in range(0, 6):
+    print("Fan {} speed: {}".format(i, check_output(['sg_ses', '--index=coo,{}'.format(i), '--get=1:2:11', '/dev/sg6']).decode('utf-8').split('\n')[0]))
+
+print_speeds()
+print("Reading current configuration...")
+out = check_output(["sg_ses", "-p", "0x2", "/dev/sg6", "--raw"]).decode('utf-8')
+s = out.split()
+if len(sys.argv) < 1:
+  print("python fanspeed.py 1-7")
+  sys.exit(-1)
+fan = int(sys.argv[1])
+for i in range(0, 6):
+  print("Setting fan {} to {}".format(i, fan))
+  idx = 92 + 4 * i
+  s[idx+0] = "80"
+  s[idx+1] = "00"
+  s[idx+2] = "00"
+  s[idx+3] = format(1 << 5 | fan & 7, "x")
+
+output = StringIO()
+off = 0
+count = 0
+line = ''
+while True:
+  output.write(s[off])
+  off = off + 1
+  count = count + 1
+  if count == 8 :
+    output.write("  ")
+  elif count == 16:
+    output.write("\n")
+    count=0
+  else:
+    output.write(" ")
+  if off >= len(s):
+    break
+output.write("\n")
+from subprocess import Popen, PIPE, STDOUT
+p = Popen(['sg_ses', '-p', '0x2', '/dev/sg6', '--control', '--data', '-'], stdout=PIPE, stdin=PIPE, stderr=PIPE)
+print(p.communicate(input=bytearray(output.getvalue(), 'utf-8'))[0].decode('utf-8'))
+time.sleep(10)
+print_speeds()