I have writen a driver that implements a simple platform device. It basically
reads I/O Mapped registers using request_mem_region()/ioremap()/release_mem_region()
and export its contents to user space using sysfs. This driver is used for debugging
purposes.
The problem takes place when I try to read these registers when the
corresponding driver, that uses these I/O mapped registers, is loaded. In other
words, I cannot request the memory region, it return a "device busy" error.
If I disable the the request_/release_mem_region() it works.
One questions arises from it:
Is there a way to read these I/O mapped registers without bypassing the
request_/release_mem_region() functions ?
Linux Kernel version: 3.10.54 on ARMv7
Best regards,
Rafael.
reads I/O Mapped registers using request_mem_region()/ioremap()/release_mem_region()
and export its contents to user space using sysfs. This driver is used for debugging
purposes.
The problem takes place when I try to read these registers when the
corresponding driver, that uses these I/O mapped registers, is loaded. In other
words, I cannot request the memory region, it return a "device busy" error.
If I disable the the request_/release_mem_region() it works.
One questions arises from it:
Is there a way to read these I/O mapped registers without bypassing the
request_/release_mem_region() functions ?
Linux Kernel version: 3.10.54 on ARMv7
Best regards,
Rafael.
--
--Albert Einstein
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