Public bug reported:
The current versions of gpiod, libgpiod-dev and libgpiod2 (1.6.2-1) use
version 1 of the GPIO character device API. However, they cannot work
because the interface is disabled in the default kernel (tested with
5.13.19). After rebuilding the kernel with the option
CONFIG_GPIO_CDEV_V1=y, the gpiod tools work as expected.
What I expect to happen:
$ gpiodetect
gpiochip0 [0-003c] (8 lines)
$ gpioinfo
gpiochip0 - 8 lines:
line 0: unnamed unused output active-high
line 1: unnamed unused output active-high
line 2: unnamed unused output active-high
line 3: unnamed unused output active-high
line 4: unnamed unused output active-high
line 5: unnamed unused output active-high
line 6: unnamed unused input active-high
line 7: unnamed unused input active-high
$ gpioget gpiochip0 0
1
What actually happens:
$ gpiodetect
gpiochip0 [0-003c] (8 lines)
$ gpioinfo
gpioinfo: error creating line iterator: Invalid argument
$ gpioget gpiochip0 0
gpioget: error reading GPIO values: Invalid argument
$ cat /proc/version_signature
Ubuntu 5.13.0-22.22-lowlatency 5.13.19
$ apt-cache policy libgpiod2
libgpiod2:
Installed: 1.6.2-1
Candidate: 1.6.2-1
Version table:
*** 1.6.2-1 500
500 http://de.archive.ubuntu.com/ubuntu impish/universe amd64 Packages
100 /var/lib/dpkg/status
I am testing with the onboard PCA9554A on a Fujitsu D3641-S motherboard.
$ lspci | grep -i smb
00:1f.4 SMBus: Intel Corporation Cannon Lake PCH SMBus Controller (rev 10)
$ lspci -s 1f.4 -vvv
00:1f.4 SMBus: Intel Corporation Cannon Lake PCH SMBus Controller (rev 10)
DeviceName: Onboard - Other
Subsystem: Fujitsu Technology Solutions Cannon Lake PCH SMBus Controller
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Interrupt: pin A routed to IRQ 16
Region 0: Memory at 6013106000 (64-bit, non-prefetchable) [size=256]
Region 4: I/O ports at efa0 [size=32]
Kernel driver in use: i801_smbus
Kernel modules: i2c_i801
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1953613
Title:
GPIO character device API not enabled in kernel
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