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 != 0U && assert != 0U) 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 } 58 59 auto Physical::state() const -> Action 60 { 61 return sdbusplus::xyz::openbmc_project::Led::server::Physical::state(); 62 } 63 64 auto Physical::state(Action value) -> Action 65 { 66 auto current = 67 sdbusplus::xyz::openbmc_project::Led::server::Physical::state(); 68 69 auto requested = 70 sdbusplus::xyz::openbmc_project::Led::server::Physical::state(value); 71 72 driveLED(current, requested); 73 74 return value; 75 } 76 77 void Physical::driveLED(Action current, Action request) 78 { 79 if (current == request) 80 { 81 return; 82 } 83 84 if (request == Action::On || request == Action::Off) 85 { 86 return stableStateOperation(request); 87 } 88 89 assert(request == Action::Blink); 90 blinkOperation(); 91 } 92 93 void Physical::stableStateOperation(Action action) 94 { 95 auto value = (action == Action::On) ? assert : DEASSERT; 96 97 led.setTrigger("none"); 98 led.setBrightness(value); 99 } 100 101 void Physical::blinkOperation() 102 { 103 auto dutyOn = this->dutyOn(); 104 105 /* 106 The configuration of the trigger type must precede the configuration of 107 the trigger type properties. From the kernel documentation: 108 "You can change triggers in a similar manner to the way an IO scheduler 109 is chosen (via /sys/class/leds/<device>/trigger). Trigger specific 110 parameters can appear in /sys/class/leds/<device> once a given trigger is 111 selected." 112 Refer: 113 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/leds/leds-class.txt?h=v5.2#n26 114 */ 115 led.setTrigger("timer"); 116 // Convert percent duty to milliseconds for sysfs interface 117 auto factor = this->period() / 100.0; 118 led.setDelayOn(dutyOn * factor); 119 led.setDelayOff((100 - dutyOn) * factor); 120 } 121 122 /** @brief set led color property in DBus*/ 123 void Physical::setLedColor(const std::string& color) 124 { 125 static const std::string prefix = 126 "xyz.openbmc_project.Led.Physical.Palette."; 127 if (!color.length()) 128 return; 129 std::string tmp = color; 130 tmp[0] = toupper(tmp[0]); 131 try 132 { 133 auto palette = convertPaletteFromString(prefix + tmp); 134 setPropertyByName("Color", palette); 135 } 136 catch (const sdbusplus::exception::InvalidEnumString&) 137 { 138 // if color var contains invalid color, 139 // Color property will have default value 140 } 141 } 142 143 } // namespace led 144 } // namespace phosphor 145