1*4882a593SmuzhiyunKernel driver raspberrypi-hwmon 2*4882a593Smuzhiyun=============================== 3*4882a593Smuzhiyun 4*4882a593SmuzhiyunSupported boards: 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun * Raspberry Pi A+ (via GPIO on SoC) 7*4882a593Smuzhiyun * Raspberry Pi B+ (via GPIO on SoC) 8*4882a593Smuzhiyun * Raspberry Pi 2 B (via GPIO on SoC) 9*4882a593Smuzhiyun * Raspberry Pi 3 B (via GPIO on port expander) 10*4882a593Smuzhiyun * Raspberry Pi 3 B+ (via PMIC) 11*4882a593Smuzhiyun 12*4882a593SmuzhiyunAuthor: Stefan Wahren <stefan.wahren@i2se.com> 13*4882a593Smuzhiyun 14*4882a593SmuzhiyunDescription 15*4882a593Smuzhiyun----------- 16*4882a593Smuzhiyun 17*4882a593SmuzhiyunThis driver periodically polls a mailbox property of the VC4 firmware to detect 18*4882a593Smuzhiyunundervoltage conditions. 19*4882a593Smuzhiyun 20*4882a593SmuzhiyunSysfs entries 21*4882a593Smuzhiyun------------- 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun======================= ================== 24*4882a593Smuzhiyunin0_lcrit_alarm Undervoltage alarm 25*4882a593Smuzhiyun======================= ================== 26