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V1.00
2011.11.15
1. update sdma_buffer_queue.h
	use new link table named loop_buffer, the node will not be freed after get_loop_buffer. All nodes are loop linking.
2. update dma_irq_handler
	driver switch buffer directly and don't care if app has processed buffer. After update dma_irq_handler, this irq handler
	process time reduced.
3. delete some no used args in mcbsp_dev
4. delete some no used functions
5. add i2c protocal port(SLK, SDA) driver, use GPIO161(SDA) and GPIO162(SLK)
6. add ioctl cmd GET_REG_STATUS, SET_REG (not complete, no test)
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2011.11.16
1. add set_reg(), read_reg()
2. complete ioctl cmd GET_REG_STATUS, SET_REG
3. update all function in rd_gpio.h
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2011.11.25
1. update dma_irq_handler(), change dma destination by a simple way to reduce irq handle time
2. add var opend in mcbsp_dev to advoid open mcbsp 2 or more times at the same time
	initialize this var in mcbsp_init(), check it in mcbsp_open(), reset it in mcbsp_release()

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