drivers/iio/dac/ad5686.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * This file is part of AD5686 DAC driver
   4  *
   5  * Copyright 2018 Analog Devices Inc.
   6  */
   7
   8 #ifndef __DRIVERS_IIO_DAC_AD5686_H__
   9 #define __DRIVERS_IIO_DAC_AD5686_H__
  10
  11 #include <linux/types.h>
  12 #include <linux/cache.h>
  13 #include <linux/mutex.h>
  14 #include <linux/kernel.h>
  15
  16 #define AD5310_CMD(x)                           ((x) << 12)
  17
  18 #define AD5683_DATA(x)                          ((x) << 4)
  19
  20 #define AD5686_ADDR(x)                          ((x) << 16)
  21 #define AD5686_CMD(x)                           ((x) << 20)
  22
  23 #define AD5686_ADDR_DAC(chan)                   (0x1 << (chan))
  24 #define AD5686_ADDR_ALL_DAC                     0xF
  25
  26 #define AD5686_CMD_NOOP                         0x0
  27 #define AD5686_CMD_WRITE_INPUT_N                0x1
  28 #define AD5686_CMD_UPDATE_DAC_N                 0x2
  29 #define AD5686_CMD_WRITE_INPUT_N_UPDATE_N       0x3
  30 #define AD5686_CMD_POWERDOWN_DAC                0x4
  31 #define AD5686_CMD_LDAC_MASK                    0x5
  32 #define AD5686_CMD_RESET                        0x6
  33 #define AD5686_CMD_INTERNAL_REFER_SETUP         0x7
  34 #define AD5686_CMD_DAISY_CHAIN_ENABLE           0x8
  35 #define AD5686_CMD_READBACK_ENABLE              0x9
  36
  37 #define AD5686_LDAC_PWRDN_NONE                  0x0
  38 #define AD5686_LDAC_PWRDN_1K                    0x1
  39 #define AD5686_LDAC_PWRDN_100K                  0x2
  40 #define AD5686_LDAC_PWRDN_3STATE                0x3
  41
  42 #define AD5686_CMD_CONTROL_REG                  0x4
  43 #define AD5686_CMD_READBACK_ENABLE_V2           0x5
  44
  45 #define AD5310_REF_BIT_MSK                      BIT(8)
  46 #define AD5683_REF_BIT_MSK                      BIT(12)
  47 #define AD5693_REF_BIT_MSK                      BIT(12)
  48
  49 /**
  50  * ad5686_supported_device_ids:
  51  */
  52 enum ad5686_supported_device_ids {
  53         ID_AD5310R,
  54         ID_AD5311R,
  55         ID_AD5338R,
  56         ID_AD5671R,
  57         ID_AD5672R,
  58         ID_AD5674R,
  59         ID_AD5675R,
  60         ID_AD5676,
  61         ID_AD5676R,
  62         ID_AD5679R,
  63         ID_AD5681R,
  64         ID_AD5682R,
  65         ID_AD5683,
  66         ID_AD5683R,
  67         ID_AD5684,
  68         ID_AD5684R,
  69         ID_AD5685R,
  70         ID_AD5686,
  71         ID_AD5686R,
  72         ID_AD5691R,
  73         ID_AD5692R,
  74         ID_AD5693,
  75         ID_AD5693R,
  76         ID_AD5694,
  77         ID_AD5694R,
  78         ID_AD5695R,
  79         ID_AD5696,
  80         ID_AD5696R,
  81 };
  82
  83 enum ad5686_regmap_type {
  84         AD5310_REGMAP,
  85         AD5683_REGMAP,
  86         AD5686_REGMAP,
  87         AD5693_REGMAP
  88 };
  89
  90 struct ad5686_state;
  91
  92 typedef int (*ad5686_write_func)(struct ad5686_state *st,
  93                                  u8 cmd, u8 addr, u16 val);
  94
  95 typedef int (*ad5686_read_func)(struct ad5686_state *st, u8 addr);
  96
  97 /**
  98  * struct ad5686_chip_info - chip specific information
  99  * @int_vref_mv:        AD5620/40/60: the internal reference voltage
 100  * @num_channels:       number of channels
 101  * @channel:            channel specification
 102  * @regmap_type:        register map layout variant
 103  */
 104
 105 struct ad5686_chip_info {
 106         u16                             int_vref_mv;
 107         unsigned int                    num_channels;
 108         const struct iio_chan_spec      *channels;
 109         enum ad5686_regmap_type         regmap_type;
 110 };
 111
 112 /**
 113  * struct ad5446_state - driver instance specific data
 114  * @spi:                spi_device
 115  * @chip_info:          chip model specific constants, available modes etc
 116  * @reg:                supply regulator
 117  * @vref_mv:            actual reference voltage used
 118  * @pwr_down_mask:      power down mask
 119  * @pwr_down_mode:      current power down mode
 120  * @use_internal_vref:  set to true if the internal reference voltage is used
 121  * @lock                lock to protect the data buffer during regmap ops
 122  * @data:               spi transfer buffers
 123  */
 124
 125 struct ad5686_state {
 126         struct device                   *dev;
 127         const struct ad5686_chip_info   *chip_info;
 128         struct regulator                *reg;
 129         unsigned short                  vref_mv;
 130         unsigned int                    pwr_down_mask;
 131         unsigned int                    pwr_down_mode;
 132         ad5686_write_func               write;
 133         ad5686_read_func                read;
 134         bool                            use_internal_vref;
 135         struct mutex                    lock;
 136
 137         /*
 138          * DMA (thus cache coherency maintenance) requires the
 139          * transfer buffers to live in their own cache lines.
 140          */
 141
 142         union {
 143                 __be32 d32;
 144                 __be16 d16;
 145                 u8 d8[4];
 146         } data[3] ____cacheline_aligned;
 147 };
 148
 149
 150 int ad5686_probe(struct device *dev,
 151                  enum ad5686_supported_device_ids chip_type,
 152                  const char *name, ad5686_write_func write,
 153                  ad5686_read_func read);
 154
 155 int ad5686_remove(struct device *dev);
 156
 157
 158 #endif /* __DRIVERS_IIO_DAC_AD5686_H__ */