Documentation/hwmon/raspberrypi-hwmon.rst
Source file repositories/reference/linux-study-clean/Documentation/hwmon/raspberrypi-hwmon.rst
File Facts
- System
- Linux kernel
- Corpus path
Documentation/hwmon/raspberrypi-hwmon.rst- Extension
.rst- Size
- 1053 bytes
- Lines
- 37
- Domain
- Support Tooling And Documentation
- Bucket
- Documentation
- Inferred role
- Support Tooling And Documentation: documentation
- Status
- atlas-only
Why This File Exists
Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
Dependency Surface
- No C-style include directives detected by the generator.
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
Kernel driver raspberrypi-hwmon
===============================
Supported boards:
* Raspberry Pi A+ (via GPIO on SoC)
* Raspberry Pi B+ (via GPIO on SoC)
* Raspberry Pi 2 B (via GPIO on SoC)
* Raspberry Pi 3 B (via GPIO on port expander)
* Raspberry Pi 3 B+ (via PMIC)
Author: Stefan Wahren <stefan.wahren@i2se.com>
Description
-----------
This driver periodically polls a mailbox property of the VC4 firmware to detect
undervoltage conditions.
Sysfs entries
-------------
======================= ======================================================
in0_input Core voltage in millivolts
in1_input SDRAM controller voltage in millivolts
in2_input SDRAM I/O voltage in millivolts
in3_input SDRAM PHY voltage in millivolts
in0_label "core"
in1_label "sdram_c"
in2_label "sdram_i"
in3_label "sdram_p"
in0_lcrit_alarm Undervoltage alarm
======================= ======================================================
The voltage inputs and labels are only exposed if the firmware reports support
for the corresponding voltage ID.Annotation
- Atlas domain: Support Tooling And Documentation / Documentation.
- Implementation status: atlas-only.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.