Hey
I'm trying to write a driver to interact with the mpu6000 imu sensor
on the raspberry pi.
I've modified the mpu6050 i2c driver in the linux kernel to use the
mpu6000's spi interface. Calls of iio_trigger_alloc fail. I've added
some debugging info to industrialio-trigger.c and from this have
narrowed it down to the irq_alloc_descs function failing to allocate
any irq's.
cat /proc/interrupts returns:
CPU0
3: 21114 ARMCTRL BCM2708 Timer Tick
32: 986019 ARMCTRL dwc_otg, dwc_otg_pcd, dwc_otg_hcd:usb1
65: 7 ARMCTRL ARM Mailbox IRQ
66: 1 ARMCTRL VCHIQ doorbell
75: 1 ARMCTRL
77: 6801 ARMCTRL bcm2708_sdhci (dma)
80: 30 ARMCTRL bcm2708_spi.0
83: 20 ARMCTRL uart-pl011
84: 11002 ARMCTRL mmc0
FIQ: usb_fiq
Err: 0
The call to irq_alloc_descs seems to be trying to allocate *any* two
consecutive irq's (two being the value of
CONFIG_IIO_CONSUMERS_PER_TRIGGER), the above i believe shows that this
should be possible?
Any idea's why irq_alloc_descs is failing?
Thanks
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