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H A Dad7877.cdiff b534422b2d1189740c6144c3c7a296be89f581c7 Mon Oct 18 11:24:22 CDT 2010 Dmitry Torokhov <dmitry.torokhov@gmail.com> Input: ad7877 - switch to using threaded IRQ

Instead of using asynchronous SPI API and then spinning waiting for SPI
transfer to complete when disabling the device, let's use threaded IRQ
model and spi_sync().

Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Tested-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>