diff options
Diffstat (limited to 'drivers/staging/iio/frequency/ad9834.h')
| -rw-r--r-- | drivers/staging/iio/frequency/ad9834.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/staging/iio/frequency/ad9834.h b/drivers/staging/iio/frequency/ad9834.h new file mode 100644 index 000000000000..ed5ed8d0007f --- /dev/null +++ b/drivers/staging/iio/frequency/ad9834.h @@ -0,0 +1,112 @@ +/* + * AD9833/AD9834/AD9837/AD9838 SPI DDS driver + * + * Copyright 2010-2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ +#ifndef IIO_DDS_AD9834_H_ +#define IIO_DDS_AD9834_H_ + +/* Registers */ + +#define AD9834_REG_CMD (0 << 14) +#define AD9834_REG_FREQ0 (1 << 14) +#define AD9834_REG_FREQ1 (2 << 14) +#define AD9834_REG_PHASE0 (6 << 13) +#define AD9834_REG_PHASE1 (7 << 13) + +/* Command Control Bits */ + +#define AD9834_B28 (1 << 13) +#define AD9834_HLB (1 << 12) +#define AD9834_FSEL (1 << 11) +#define AD9834_PSEL (1 << 10) +#define AD9834_PIN_SW (1 << 9) +#define AD9834_RESET (1 << 8) +#define AD9834_SLEEP1 (1 << 7) +#define AD9834_SLEEP12 (1 << 6) +#define AD9834_OPBITEN (1 << 5) +#define AD9834_SIGN_PIB (1 << 4) +#define AD9834_DIV2 (1 << 3) +#define AD9834_MODE (1 << 1) + +#define AD9834_FREQ_BITS 28 +#define AD9834_PHASE_BITS 12 + +#define RES_MASK(bits) ((1 << (bits)) - 1) + +/** + * struct ad9834_state - driver instance specific data + * @spi: spi_device + * @reg: supply regulator + * @mclk: external master clock + * @control: cached control word + * @xfer: default spi transfer + * @msg: default spi message + * @freq_xfer: tuning word spi transfer + * @freq_msg: tuning word spi message + * @data: spi transmit buffer + * @freq_data: tuning word spi transmit buffer + */ + +struct ad9834_state { + struct spi_device *spi; + struct regulator *reg; + unsigned int mclk; + unsigned short control; + unsigned short devid; + struct spi_transfer xfer; + struct spi_message msg; + struct spi_transfer freq_xfer[2]; + struct spi_message freq_msg; + + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + unsigned short data ____cacheline_aligned; + unsigned short freq_data[2] ; +}; + + +/* + * TODO: struct ad7887_platform_data needs to go into include/linux/iio + */ + +/** + * struct ad9834_platform_data - platform specific information + * @mclk: master clock in Hz + * @freq0: power up freq0 tuning word in Hz + * @freq1: power up freq1 tuning word in Hz + * @phase0: power up phase0 value [0..4095] correlates with 0..2PI + * @phase1: power up phase1 value [0..4095] correlates with 0..2PI + * @en_div2: digital output/2 is passed to the SIGN BIT OUT pin + * @en_signbit_msb_out: the MSB (or MSB/2) of the DAC data is connected to the + * SIGN BIT OUT pin. en_div2 controls whether it is the MSB + * or MSB/2 that is output. if en_signbit_msb_out=false, + * the on-board comparator is connected to SIGN BIT OUT + */ + +struct ad9834_platform_data { + unsigned int mclk; + unsigned int freq0; + unsigned int freq1; + unsigned short phase0; + unsigned short phase1; + bool en_div2; + bool en_signbit_msb_out; +}; + +/** + * ad9834_supported_device_ids: + */ + +enum ad9834_supported_device_ids { + ID_AD9833, + ID_AD9834, + ID_AD9837, + ID_AD9838, +}; + +#endif /* IIO_DDS_AD9834_H_ */ |