diff options
Diffstat (limited to 'drivers/staging/iio/dac/ad5791.h')
-rw-r--r-- | drivers/staging/iio/dac/ad5791.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/drivers/staging/iio/dac/ad5791.h b/drivers/staging/iio/dac/ad5791.h new file mode 100644 index 000000000000..f09ad9a430c3 --- /dev/null +++ b/drivers/staging/iio/dac/ad5791.h @@ -0,0 +1,116 @@ +/* + * AD5791 SPI DAC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#ifndef SPI_AD5791_H_ +#define SPI_AD5791_H_ + +#define AD5791_RES_MASK(x) ((1 << (x)) - 1) +#define AD5791_DAC_MASK AD5791_RES_MASK(20) +#define AD5791_DAC_MSB (1 << 19) + +#define AD5791_CMD_READ (1 << 23) +#define AD5791_CMD_WRITE (0 << 23) +#define AD5791_ADDR(addr) ((addr) << 20) + +/* Registers */ +#define AD5791_ADDR_NOOP 0 +#define AD5791_ADDR_DAC0 1 +#define AD5791_ADDR_CTRL 2 +#define AD5791_ADDR_CLRCODE 3 +#define AD5791_ADDR_SW_CTRL 4 + +/* Control Register */ +#define AD5791_CTRL_RBUF (1 << 1) +#define AD5791_CTRL_OPGND (1 << 2) +#define AD5791_CTRL_DACTRI (1 << 3) +#define AD5791_CTRL_BIN2SC (1 << 4) +#define AD5791_CTRL_SDODIS (1 << 5) +#define AD5761_CTRL_LINCOMP(x) ((x) << 6) + +#define AD5791_LINCOMP_0_10 0 +#define AD5791_LINCOMP_10_12 1 +#define AD5791_LINCOMP_12_16 2 +#define AD5791_LINCOMP_16_19 3 +#define AD5791_LINCOMP_19_20 12 + +#define AD5780_LINCOMP_0_10 0 +#define AD5780_LINCOMP_10_20 12 + +/* Software Control Register */ +#define AD5791_SWCTRL_LDAC (1 << 0) +#define AD5791_SWCTRL_CLR (1 << 1) +#define AD5791_SWCTRL_RESET (1 << 2) + +#define AD5791_DAC_PWRDN_6K 0 +#define AD5791_DAC_PWRDN_3STATE 1 + +/* + * TODO: struct ad5791_platform_data needs to go into include/linux/iio + */ + +/** + * struct ad5791_platform_data - platform specific information + * @vref_pos_mv: Vdd Positive Analog Supply Volatge (mV) + * @vref_neg_mv: Vdd Negative Analog Supply Volatge (mV) + * @use_rbuf_gain2: ext. amplifier connected in gain of two configuration + */ + +struct ad5791_platform_data { + u16 vref_pos_mv; + u16 vref_neg_mv; + bool use_rbuf_gain2; +}; + +/** + * struct ad5791_chip_info - chip specific information + * @bits: accuracy of the DAC in bits + * @left_shift: number of bits the datum must be shifted + * @get_lin_comp: function pointer to the device specific function + */ + +struct ad5791_chip_info { + u8 bits; + u8 left_shift; + int (*get_lin_comp) (unsigned int span); +}; + +/** + * struct ad5791_state - driver instance specific data + * @indio_dev: the industrial I/O device + * @us: spi_device + * @reg_vdd: positive supply regulator + * @reg_vss: negative supply regulator + * @chip_info: chip model specific constants + * @vref_mv: actual reference voltage used + * @pwr_down_mode current power down mode + */ + +struct ad5791_state { + struct iio_dev *indio_dev; + struct spi_device *spi; + struct regulator *reg_vdd; + struct regulator *reg_vss; + const struct ad5791_chip_info *chip_info; + unsigned short vref_mv; + unsigned ctrl; + unsigned pwr_down_mode; + bool pwr_down; +}; + +/** + * ad5791_supported_device_ids: + */ + +enum ad5791_supported_device_ids { + ID_AD5760, + ID_AD5780, + ID_AD5781, + ID_AD5791, +}; + +#endif /* SPI_AD5791_H_ */ |