Lesson 12 - #122
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megaparanoik wants to merge 8 commits into
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Lesson 12#122megaparanoik wants to merge 8 commits into
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January 18, 2019 00:11
As a base we took a driver from lesson 11. Signed-off-by: Aleksandr Androsov <eelleekk.gmail.com>
In order to have access from user-space we implement a char device interface which allocates /dev/accel device Signed-off-by: Aleksandr Androsov <eelleekk.gmail.com>
Signed-off-by: Aleksandr Androsov <eelleekk.gmail.com>
Just to inform a user that the device doesn't support a read operation we print a message to use IOCTL instead. Signed-off-by: Aleksandr Androsov <eelleekk.gmail.com>
Since the driver doesn't allow any input parameter we just return EFAULT. Signed-off-by: Aleksandr Androsov <eelleekk.gmail.com>
Signed-off-by: Aleksandr Androsov <eelleekk.gmail.com>
To be able to get acces to the device we have implemented a user space application which interacts with the driver via read/write operations an IOCTLs. Signed-off-by: Aleksandr Androsov <eelleekk.gmail.com>
application Signed-off-by: Aleksandr Androsov <eelleekk.gmail.com>
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There was added a char device interface to the existed mpu6050 driver.
Now the driver allocates the char device file /dev/accel.
There were implemented write and read operation but they are extremely limited.
Essentially, the driver doesn't allow direct read or write thus we just inform a userspace application to use IOCTL instead.
The IOCTLs Implemented allow to get access to the raw accelerometer data, a statistic related to IRQ handling.
Also, these IOCTLs allow writing and reading to/from any register in IC directly.