1 /** 2 * Copyright © 2016,2018 IBM Corporation 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "physical.hpp" 18 19 #include <cassert> 20 #include <cstdlib> 21 #include <iostream> 22 #include <string> 23 namespace phosphor 24 { 25 namespace led 26 { 27 28 /** @brief Populates key parameters */ 29 void Physical::setInitialState() 30 { 31 assert = led.getMaxBrightness(); 32 auto trigger = led.getTrigger(); 33 if (trigger == "timer") 34 { 35 // LED is blinking. Get the on and off delays and derive percent duty 36 auto delayOn = led.getDelayOn(); 37 uint16_t periodMs = delayOn + led.getDelayOff(); 38 auto percentScale = periodMs / 100; 39 this->dutyOn(delayOn / percentScale); 40 this->period(periodMs); 41 } 42 else 43 { 44 // Cache current LED state 45 auto brightness = led.getBrightness(); 46 if (brightness == assert) 47 { 48 sdbusplus::xyz::openbmc_project::Led::server::Physical::state( 49 Action::On); 50 } 51 else 52 { 53 sdbusplus::xyz::openbmc_project::Led::server::Physical::state( 54 Action::Off); 55 } 56 } 57 return; 58 } 59 60 auto Physical::state(Action value) -> Action 61 { 62 auto current = 63 sdbusplus::xyz::openbmc_project::Led::server::Physical::state(); 64 65 auto requested = 66 sdbusplus::xyz::openbmc_project::Led::server::Physical::state(value); 67 68 driveLED(current, requested); 69 70 return value; 71 } 72 73 void Physical::driveLED(Action current, Action request) 74 { 75 if (current == request) 76 { 77 return; 78 } 79 80 if (request == Action::On || request == Action::Off) 81 { 82 return stableStateOperation(request); 83 } 84 85 assert(request == Action::Blink); 86 blinkOperation(); 87 } 88 89 void Physical::stableStateOperation(Action action) 90 { 91 auto value = (action == Action::On) ? assert : DEASSERT; 92 93 led.setTrigger("none"); 94 led.setBrightness(value); 95 return; 96 } 97 98 void Physical::blinkOperation() 99 { 100 auto dutyOn = this->dutyOn(); 101 102 /* 103 The configuration of the trigger type must precede the configuration of 104 the trigger type properties. From the kernel documentation: 105 "You can change triggers in a similar manner to the way an IO scheduler 106 is chosen (via /sys/class/leds/<device>/trigger). Trigger specific 107 parameters can appear in /sys/class/leds/<device> once a given trigger is 108 selected." 109 Refer: 110 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/leds/leds-class.txt?h=v5.2#n26 111 */ 112 led.setTrigger("timer"); 113 // Convert percent duty to milliseconds for sysfs interface 114 auto factor = this->period() / 100.0; 115 led.setDelayOn(dutyOn * factor); 116 led.setDelayOff((100 - dutyOn) * factor); 117 118 return; 119 } 120 121 /** @brief set led color property in DBus*/ 122 void Physical::setLedColor(const std::string& color) 123 { 124 static const std::string prefix = 125 "xyz.openbmc_project.Led.Physical.Palette."; 126 if (!color.length()) 127 return; 128 std::string tmp = color; 129 tmp[0] = toupper(tmp[0]); 130 try 131 { 132 auto palette = convertPaletteFromString(prefix + tmp); 133 setPropertyByName("Color", palette); 134 } 135 catch (const sdbusplus::exception::InvalidEnumString&) 136 { 137 // if color var contains invalid color, 138 // Color property will have default value 139 } 140 } 141 142 } // namespace led 143 } // namespace phosphor 144