From 93d444d1aade59b5e88f41b71c842a00ab950c64 Mon Sep 17 00:00:00 2001 From: Andrew Tridgell Date: Tue, 8 Jul 2014 21:09:12 +1000 Subject: device: added a _device_id to all drivers this device ID identifies a specific device via the tuple of (bus, bus type, address, devtype). This allows device specific configuration data to be stored along with a device ID, so the code can know when the user has changed device configuration (such as removing an external compass), and either invalidate the device configuration or force the user to re-calibrate --- src/drivers/device/device.cpp | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'src/drivers/device/device.cpp') diff --git a/src/drivers/device/device.cpp b/src/drivers/device/device.cpp index 683455149..f1f777dce 100644 --- a/src/drivers/device/device.cpp +++ b/src/drivers/device/device.cpp @@ -42,6 +42,7 @@ #include #include #include +#include namespace device { @@ -93,6 +94,13 @@ Device::Device(const char *name, _irq_attached(false) { sem_init(&_lock, 0, 1); + + /* setup a default device ID. When bus_type is UNKNOWN the + other fields are invalid */ + _device_id.devid_s.bus_type = DeviceBusType_UNKNOWN; + _device_id.devid_s.bus = 0; + _device_id.devid_s.address = 0; + _device_id.devid_s.devtype = 0; } Device::~Device() @@ -238,6 +246,10 @@ Device::write(unsigned offset, void *data, unsigned count) int Device::ioctl(unsigned operation, unsigned &arg) { + switch (operation) { + case DEVIOCGDEVICEID: + return (int)_device_id.devid; + } return -ENODEV; } -- cgit v1.2.3