adamksmith
a911b9e4cb
ESPHome external_component that presents a synthetic 64 KB FAT12 disk over the ESP32-S3's native USB-OTG, containing a one-byte switch_position file and a switch_position_grub.cfg snippet. The disk's volume serial is fixed at 0x55AA6922 to stay drop-in compatible with the upstream /etc/grub.d hook. Components: - fat12 / msc_disk: portable FAT12 sector synthesiser ported from reference/src/fat.c and the boot-sector / FAT / dir-entry generation in reference/src/usb.c. - usb_descriptors / tusb_glue: TinyUSB MSC class with our own callbacks delegating to MscDisk::read_lba (linker --allow-multiple-definition picks ours over esp_tinyusb's storage-backed defaults). - grub_boot_switch: top-level Component, NVS persistence on target changes, exposes targets table to sub-platforms. - select: HA-facing select platform reading parent's targets map. Validated end-to-end on an ESP32-S3-DevKitC-1: USB enumerates as 26ba:8003, /dev/sdb mounts FAT12, mtype reads back the live target, and POST /select/boot_target/set?option=Windows updates both files on the next host read.
52 lines
1.5 KiB
Python
52 lines
1.5 KiB
Python
"""Select sub-platform for grub_boot_switch.
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Exposes the parent's targets table as a Home Assistant select entity. The
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options list is derived at code-gen time from the parent's `targets:` map, so
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adding/removing entries there automatically updates the dropdown.
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"""
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import esphome.codegen as cg
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import esphome.config_validation as cv
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from esphome.components import select
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from esphome.const import CONF_ID
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from .. import (
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CONF_GRUB_BOOT_SWITCH_ID,
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CONF_TARGETS,
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GrubBootSwitch,
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grub_boot_switch_ns,
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)
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DEPENDENCIES = ["grub_boot_switch"]
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BootTargetSelect = grub_boot_switch_ns.class_(
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"BootTargetSelect", select.Select, cg.Component
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)
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CONFIG_SCHEMA = select.select_schema(BootTargetSelect).extend(
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{
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cv.GenerateID(CONF_GRUB_BOOT_SWITCH_ID): cv.use_id(GrubBootSwitch),
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}
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)
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async def to_code(config):
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parent = await cg.get_variable(config[CONF_GRUB_BOOT_SWITCH_ID])
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# Reach back into the *full* validated config so we can pull the parent's
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# targets map. CORE.config holds the post-validation tree.
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from esphome.core import CORE
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parent_cfg = CORE.config.get("grub_boot_switch", {})
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targets = parent_cfg.get(CONF_TARGETS, {})
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if not targets:
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raise cv.Invalid(
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"select platform requires the grub_boot_switch component to define `targets:`"
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)
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options = [label for _digit, label in sorted(targets.items())]
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var = await select.new_select(config, options=options)
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await cg.register_component(var, config)
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cg.add(var.set_parent(parent))
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