1 What: /sys/class/firmware/.../data
4 Contact: Russ Weight <russ.weight@linux.dev>
5 Description: The data sysfs file is used for firmware-fallback and for
6 firmware uploads. Cat a firmware image to this sysfs file
7 after you echo 1 to the loading sysfs file. When the firmware
8 image write is complete, echo 0 to the loading sysfs file. This
9 sequence will signal the completion of the firmware write and
10 signal the lower-level driver that the firmware data is
13 What: /sys/class/firmware/.../cancel
16 Contact: Russ Weight <russ.weight@linux.dev>
17 Description: Write-only. For firmware uploads, write a "1" to this file to
18 request that the transfer of firmware data to the lower-level
19 device be canceled. This request will be rejected (EBUSY) if
20 the update cannot be canceled (e.g. a FLASH write is in
21 progress) or (ENODEV) if there is no firmware update in progress.
23 What: /sys/class/firmware/.../error
26 Contact: Russ Weight <russ.weight@linux.dev>
27 Description: Read-only. Returns a string describing a failed firmware
28 upload. This string will be in the form of <STATUS>:<ERROR>,
29 where <STATUS> will be one of the status strings described
30 for the status sysfs file and <ERROR> will be one of the
31 following: "hw-error", "timeout", "user-abort", "device-busy",
32 "invalid-file-size", "read-write-error", "flash-wearout". The
33 error sysfs file is only meaningful when the current firmware
34 upload status is "idle". If this file is read while a firmware
35 transfer is in progress, then the read will fail with EBUSY.
37 What: /sys/class/firmware/.../loading
40 Contact: Russ Weight <russ.weight@linux.dev>
41 Description: The loading sysfs file is used for both firmware-fallback and
42 for firmware uploads. Echo 1 onto the loading file to indicate
43 you are writing a firmware file to the data sysfs node. Echo
44 -1 onto this file to abort the data write or echo 0 onto this
45 file to indicate that the write is complete. For firmware
46 uploads, the zero value also triggers the transfer of the
47 firmware data to the lower-level device driver.
49 What: /sys/class/firmware/.../remaining_size
52 Contact: Russ Weight <russ.weight@linux.dev>
53 Description: Read-only. For firmware upload, this file contains the size
54 of the firmware data that remains to be transferred to the
55 lower-level device driver. The size value is initialized to
56 the full size of the firmware image that was previously
57 written to the data sysfs file. This value is periodically
58 updated during the "transferring" phase of the firmware
62 What: /sys/class/firmware/.../status
65 Contact: Russ Weight <russ.weight@linux.dev>
66 Description: Read-only. Returns a string describing the current status of
67 a firmware upload. The string will be one of the following:
68 idle, "receiving", "preparing", "transferring", "programming".
70 What: /sys/class/firmware/.../timeout
73 Contact: Russ Weight <russ.weight@linux.dev>
74 Description: This file supports the timeout mechanism for firmware
75 fallback. This file has no affect on firmware uploads. For
76 more information on timeouts please see the documentation
77 for firmware fallback.