drivers/staging/iio/dac/ad5446.h

   1 /*
   2  * AD5446 SPI DAC driver
   3  *
   4  * Copyright 2010 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8 #ifndef IIO_DAC_AD5446_H_
   9 #define IIO_DAC_AD5446_H_
  10
  11 /* DAC Control Bits */
  12
  13 #define AD5446_LOAD             (0x0 << 14) /* Load and update */
  14 #define AD5446_SDO_DIS          (0x1 << 14) /* Disable SDO */
  15 #define AD5446_NOP              (0x2 << 14) /* No operation */
  16 #define AD5446_CLK_RISING       (0x3 << 14) /* Clock data on rising edge */
  17
  18 #define AD5620_LOAD             (0x0 << 14) /* Load and update Norm Operation*/
  19 #define AD5620_PWRDWN_1k        (0x1 << 14) /* Power-down: 1kOhm to GND */
  20 #define AD5620_PWRDWN_100k      (0x2 << 14) /* Power-down: 100kOhm to GND */
  21 #define AD5620_PWRDWN_TRISTATE  (0x3 << 14) /* Power-down: Three-state */
  22
  23 #define AD5660_LOAD             (0x0 << 16) /* Load and update Norm Operation*/
  24 #define AD5660_PWRDWN_1k        (0x1 << 16) /* Power-down: 1kOhm to GND */
  25 #define AD5660_PWRDWN_100k      (0x2 << 16) /* Power-down: 100kOhm to GND */
  26 #define AD5660_PWRDWN_TRISTATE  (0x3 << 16) /* Power-down: Three-state */
  27
  28 #define RES_MASK(bits)  ((1 << (bits)) - 1)
  29
  30 #define MODE_PWRDWN_1k          0x1
  31 #define MODE_PWRDWN_100k        0x2
  32 #define MODE_PWRDWN_TRISTATE    0x3
  33
  34 /**
  35  * struct ad5446_state - driver instance specific data
  36  * @indio_dev:          the industrial I/O device
  37  * @spi:                spi_device
  38  * @chip_info:          chip model specific constants, available modes etc
  39  * @reg:                supply regulator
  40  * @poll_work:          bottom half of polling interrupt handler
  41  * @vref_mv:            actual reference voltage used
  42  * @xfer:               default spi transfer
  43  * @msg:                default spi message
  44  * @data:               spi transmit buffer
  45  */
  46
  47 struct ad5446_state {
  48         struct iio_dev                  *indio_dev;
  49         struct spi_device               *spi;
  50         const struct ad5446_chip_info   *chip_info;
  51         struct regulator                *reg;
  52         struct work_struct              poll_work;
  53         unsigned short                  vref_mv;
  54         unsigned                        cached_val;
  55         unsigned                        pwr_down_mode;
  56         unsigned                        pwr_down;
  57         struct spi_transfer             xfer;
  58         struct spi_message              msg;
  59         union {
  60                 unsigned short          d16;
  61                 unsigned char           d24[3];
  62         } data;
  63 };
  64
  65 /**
  66  * struct ad5446_chip_info - chip specific information
  67  * @bits:               accuracy of the DAC in bits
  68  * @storagebits:        number of bits written to the DAC
  69  * @left_shift:         number of bits the datum must be shifted
  70  * @int_vref_mv:        AD5620/40/60: the internal reference voltage
  71  * @store_sample:       chip specific helper function to store the datum
  72  * @store_sample:       chip specific helper function to store the powerpown cmd
  73  */
  74
  75 struct ad5446_chip_info {
  76         u8                      bits;
  77         u8                      storagebits;
  78         u8                      left_shift;
  79         u16                     int_vref_mv;
  80         void (*store_sample)    (struct ad5446_state *st, unsigned val);
  81         void (*store_pwr_down)  (struct ad5446_state *st, unsigned mode);
  82 };
  83
  84 /**
  85  * ad5446_supported_device_ids:
  86  * The AD5620/40/60 parts are available in different fixed internal reference
  87  * voltage options. The actual part numbers may look differently
  88  * (and a bit cryptic), however this style is used to make clear which
  89  * parts are supported here.
  90  */
  91
  92 enum ad5446_supported_device_ids {
  93         ID_AD5444,
  94         ID_AD5446,
  95         ID_AD5541A,
  96         ID_AD5542A,
  97         ID_AD5543,
  98         ID_AD5512A,
  99         ID_AD5553,
 100         ID_AD5601,
 101         ID_AD5611,
 102         ID_AD5621,
 103         ID_AD5620_2500,
 104         ID_AD5620_1250,
 105         ID_AD5640_2500,
 106         ID_AD5640_1250,
 107         ID_AD5660_2500,
 108         ID_AD5660_1250,
 109 };
 110
 111 #endif /* IIO_DAC_AD5446_H_ */