1 files changed, 85 insertions, 0 deletions
diff --git a/meta-facebook/meta-wedge/recipes-wedge/fan-ctrl/fan-ctrl/set_fan_speed.sh b/meta-facebook/meta-wedge/recipes-wedge/fan-ctrl/fan-ctrl/set_fan_speed.sh
new file mode 100755
index 0000000..a71850f
--- /dev/null
+++ b/meta-facebook/meta-wedge/recipes-wedge/fan-ctrl/fan-ctrl/set_fan_speed.sh
@@ -0,0 +1,85 @@
+#!/bin/sh
+#
+# Copyright 2004-present Facebook. All Rights Reserved.
+#
+# This program file is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program in a file named COPYING; if not, write to the
+# Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor,
+# Boston, MA 02110-1301 USA
+#
+usage() {
+    echo "Usage: $0 <PERCENT (0..100)> <Fan Unit (0..3)> " >&2
+}
+
+PWM_DIR=/sys/devices/platform/ast_pwm_tacho.0
+
+# The maximum unit setting.
+# This should be the value in pwm_type_m_unit plus 1
+PWM_UNIT_MAX=96
+
+set -e
+
+if [ "$#" -ne 2 ] && [ "$#" -ne 1 ]; then
+    usage
+    exit 1
+fi
+
+# refer to the comments in init_pwn.sh regarding
+# the fan unit and PWM mapping
+if [ "$#" -eq 1 ]; then
+    PWMS="0:7 1:6 2:0 3:1"
+else
+    case "$2" in
+    "0")
+        PWMS="0:7"
+        ;;
+    "1")
+        PWMS="1:6"
+        ;;
+    "2")
+        PWMS="2:0"
+        ;;
+    "3")
+        PWMS="3:1"
+        ;;
+    *)
+        usage
+        exit 1
+        ;;
+    esac
+fi
+
+# Convert the percentage to our 1/96th unit.
+unit=$(( ( $1 * $PWM_UNIT_MAX ) / 100 ))
+
+for FAN_PWM in $PWMS; do
+    FAN_N=${FAN_PWM%%:*}
+    PWM_N=${FAN_PWM##*:}
+    if [ "$unit" -eq 0 ]; then
+        # For 0%, turn off the PWM entirely
+        echo 0 > $PWM_DIR/pwm${PWM_N}_en
+    else
+        if [ "$unit" -eq $PWM_UNIT_MAX ]; then
+            # For 100%, set falling and rising to the same value
+            unit=0
+        fi
+
+        # always use type M. refer to the comments in init_pwm.sh
+        echo 0 > $PWM_DIR/pwm${PWM_N}_type
+        echo 0 > $PWM_DIR/pwm${PWM_N}_rising
+        echo "$unit" > $PWM_DIR/pwm${PWM_N}_falling
+        echo 1 > $PWM_DIR/pwm${PWM_N}_en
+    fi
+
+    echo "Successfully set fan ${FAN_N} (PWM: $PWM_N) speed to $1%"
+done