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 MODE_PWRDWN_1k          0x1
  29 #define MODE_PWRDWN_100k        0x2
  30 #define MODE_PWRDWN_TRISTATE    0x3
  31
  32 /**
  33  * struct ad5446_state - driver instance specific data
  34  * @spi:                spi_device
  35  * @chip_info:          chip model specific constants, available modes etc
  36  * @reg:                supply regulator
  37  * @poll_work:          bottom half of polling interrupt handler
  38  * @vref_mv:            actual reference voltage used
  39  * @xfer:               default spi transfer
  40  * @msg:                default spi message
  41  * @data:               spi transmit buffer
  42  */
  43
  44 struct ad5446_state {
  45         struct spi_device               *spi;
  46         const struct ad5446_chip_info   *chip_info;
  47         struct regulator                *reg;
  48         struct work_struct              poll_work;
  49         unsigned short                  vref_mv;
  50         unsigned                        cached_val;
  51         unsigned                        pwr_down_mode;
  52         unsigned                        pwr_down;
  53         struct spi_transfer             xfer;
  54         struct spi_message              msg;
  55         union {
  56                 unsigned short          d16;
  57                 unsigned char           d24[3];
  58         } data;
  59 };
  60
  61 /**
  62  * struct ad5446_chip_info - chip specific information
  63  * @channel:            channel spec for the DAC
  64  * @int_vref_mv:        AD5620/40/60: the internal reference voltage
  65  * @store_sample:       chip specific helper function to store the datum
  66  * @store_sample:       chip specific helper function to store the powerpown cmd
  67  */
  68
  69 struct ad5446_chip_info {
  70         struct iio_chan_spec    channel;
  71         u16                     int_vref_mv;
  72         void (*store_sample)    (struct ad5446_state *st, unsigned val);
  73         void (*store_pwr_down)  (struct ad5446_state *st, unsigned mode);
  74 };
  75
  76 /**
  77  * ad5446_supported_device_ids:
  78  * The AD5620/40/60 parts are available in different fixed internal reference
  79  * voltage options. The actual part numbers may look differently
  80  * (and a bit cryptic), however this style is used to make clear which
  81  * parts are supported here.
  82  */
  83
  84 enum ad5446_supported_device_ids {
  85         ID_AD5444,
  86         ID_AD5446,
  87         ID_AD5541A,
  88         ID_AD5542A,
  89         ID_AD5543,
  90         ID_AD5512A,
  91         ID_AD5553,
  92         ID_AD5601,
  93         ID_AD5611,
  94         ID_AD5621,
  95         ID_AD5620_2500,
  96         ID_AD5620_1250,
  97         ID_AD5640_2500,
  98         ID_AD5640_1250,
  99         ID_AD5660_2500,
 100         ID_AD5660_1250,
 101 };
 102
 103 #endif /* IIO_DAC_AD5446_H_ */