drivers/staging/iio/dac/ad5791.h

   1 /*
   2  * AD5791 SPI DAC driver
   3  *
   4  * Copyright 2011 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2.
   7  */
   8
   9 #ifndef SPI_AD5791_H_
  10 #define SPI_AD5791_H_
  11
  12 #define AD5791_RES_MASK(x)              ((1 << (x)) - 1)
  13 #define AD5791_DAC_MASK                 AD5791_RES_MASK(20)
  14 #define AD5791_DAC_MSB                  (1 << 19)
  15
  16 #define AD5791_CMD_READ                 (1 << 23)
  17 #define AD5791_CMD_WRITE                (0 << 23)
  18 #define AD5791_ADDR(addr)               ((addr) << 20)
  19
  20 /* Registers */
  21 #define AD5791_ADDR_NOOP                0
  22 #define AD5791_ADDR_DAC0                1
  23 #define AD5791_ADDR_CTRL                2
  24 #define AD5791_ADDR_CLRCODE             3
  25 #define AD5791_ADDR_SW_CTRL             4
  26
  27 /* Control Register */
  28 #define AD5791_CTRL_RBUF                (1 << 1)
  29 #define AD5791_CTRL_OPGND               (1 << 2)
  30 #define AD5791_CTRL_DACTRI              (1 << 3)
  31 #define AD5791_CTRL_BIN2SC              (1 << 4)
  32 #define AD5791_CTRL_SDODIS              (1 << 5)
  33 #define AD5761_CTRL_LINCOMP(x)          ((x) << 6)
  34
  35 #define AD5791_LINCOMP_0_10             0
  36 #define AD5791_LINCOMP_10_12            1
  37 #define AD5791_LINCOMP_12_16            2
  38 #define AD5791_LINCOMP_16_19            3
  39 #define AD5791_LINCOMP_19_20            12
  40
  41 #define AD5780_LINCOMP_0_10             0
  42 #define AD5780_LINCOMP_10_20            12
  43
  44 /* Software Control Register */
  45 #define AD5791_SWCTRL_LDAC              (1 << 0)
  46 #define AD5791_SWCTRL_CLR               (1 << 1)
  47 #define AD5791_SWCTRL_RESET             (1 << 2)
  48
  49 #define AD5791_DAC_PWRDN_6K             0
  50 #define AD5791_DAC_PWRDN_3STATE         1
  51
  52 /*
  53  * TODO: struct ad5791_platform_data needs to go into include/linux/iio
  54  */
  55
  56 /**
  57  * struct ad5791_platform_data - platform specific information
  58  * @vref_pos_mv:        Vdd Positive Analog Supply Volatge (mV)
  59  * @vref_neg_mv:        Vdd Negative Analog Supply Volatge (mV)
  60  * @use_rbuf_gain2:     ext. amplifier connected in gain of two configuration
  61  */
  62
  63 struct ad5791_platform_data {
  64         u16                             vref_pos_mv;
  65         u16                             vref_neg_mv;
  66         bool                            use_rbuf_gain2;
  67 };
  68
  69 /**
  70  * struct ad5791_chip_info - chip specific information
  71  * @bits:               accuracy of the DAC in bits
  72  * @left_shift:         number of bits the datum must be shifted
  73  * @get_lin_comp:       function pointer to the device specific function
  74  */
  75
  76 struct ad5791_chip_info {
  77         u8                      bits;
  78         u8                      left_shift;
  79         int (*get_lin_comp)     (unsigned int span);
  80 };
  81
  82 /**
  83  * struct ad5791_state - driver instance specific data
  84  * @indio_dev:          the industrial I/O device
  85  * @us:                 spi_device
  86  * @reg_vdd:            positive supply regulator
  87  * @reg_vss:            negative supply regulator
  88  * @chip_info:          chip model specific constants
  89  * @vref_mv:            actual reference voltage used
  90  * @pwr_down_mode       current power down mode
  91  */
  92
  93 struct ad5791_state {
  94         struct iio_dev                  *indio_dev;
  95         struct spi_device               *spi;
  96         struct regulator                *reg_vdd;
  97         struct regulator                *reg_vss;
  98         const struct ad5791_chip_info   *chip_info;
  99         unsigned short                  vref_mv;
 100         unsigned                        ctrl;
 101         unsigned                        pwr_down_mode;
 102         bool                            pwr_down;
 103 };
 104
 105 /**
 106  * ad5791_supported_device_ids:
 107  */
 108
 109 enum ad5791_supported_device_ids {
 110         ID_AD5760,
 111         ID_AD5780,
 112         ID_AD5781,
 113         ID_AD5791,
 114 };
 115
 116 #endif /* SPI_AD5791_H_ */