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 #include <linux/iio/iio.h>
  17
  18 #define AD5310_CMD(x)                           ((x) << 12)
  19
  20 #define AD5683_DATA(x)                          ((x) << 4)
  21
  22 #define AD5686_ADDR(x)                          ((x) << 16)
  23 #define AD5686_CMD(x)                           ((x) << 20)
  24
  25 #define AD5686_ADDR_DAC(chan)                   (0x1 << (chan))
  26 #define AD5686_ADDR_ALL_DAC                     0xF
  27
  28 #define AD5686_CMD_NOOP                         0x0
  29 #define AD5686_CMD_WRITE_INPUT_N                0x1
  30 #define AD5686_CMD_UPDATE_DAC_N                 0x2
  31 #define AD5686_CMD_WRITE_INPUT_N_UPDATE_N       0x3
  32 #define AD5686_CMD_POWERDOWN_DAC                0x4
  33 #define AD5686_CMD_LDAC_MASK                    0x5
  34 #define AD5686_CMD_RESET                        0x6
  35 #define AD5686_CMD_INTERNAL_REFER_SETUP         0x7
  36 #define AD5686_CMD_DAISY_CHAIN_ENABLE           0x8
  37 #define AD5686_CMD_READBACK_ENABLE              0x9
  38
  39 #define AD5686_LDAC_PWRDN_NONE                  0x0
  40 #define AD5686_LDAC_PWRDN_1K                    0x1
  41 #define AD5686_LDAC_PWRDN_100K                  0x2
  42 #define AD5686_LDAC_PWRDN_3STATE                0x3
  43
  44 #define AD5686_CMD_CONTROL_REG                  0x4
  45 #define AD5686_CMD_READBACK_ENABLE_V2           0x5
  46
  47 #define AD5310_REF_BIT_MSK                      BIT(8)
  48 #define AD5683_REF_BIT_MSK                      BIT(12)
  49 #define AD5693_REF_BIT_MSK                      BIT(12)
  50
  51 /**
  52  * ad5686_supported_device_ids:
  53  */
  54 enum ad5686_supported_device_ids {
  55         ID_AD5310R,
  56         ID_AD5311R,
  57         ID_AD5337R,
  58         ID_AD5338R,
  59         ID_AD5671R,
  60         ID_AD5672R,
  61         ID_AD5673R,
  62         ID_AD5674R,
  63         ID_AD5675R,
  64         ID_AD5676,
  65         ID_AD5676R,
  66         ID_AD5677R,
  67         ID_AD5679R,
  68         ID_AD5681R,
  69         ID_AD5682R,
  70         ID_AD5683,
  71         ID_AD5683R,
  72         ID_AD5684,
  73         ID_AD5684R,
  74         ID_AD5685R,
  75         ID_AD5686,
  76         ID_AD5686R,
  77         ID_AD5691R,
  78         ID_AD5692R,
  79         ID_AD5693,
  80         ID_AD5693R,
  81         ID_AD5694,
  82         ID_AD5694R,
  83         ID_AD5695R,
  84         ID_AD5696,
  85         ID_AD5696R,
  86 };
  87
  88 enum ad5686_regmap_type {
  89         AD5310_REGMAP,
  90         AD5683_REGMAP,
  91         AD5686_REGMAP,
  92         AD5693_REGMAP
  93 };
  94
  95 struct ad5686_state;
  96
  97 typedef int (*ad5686_write_func)(struct ad5686_state *st,
  98                                  u8 cmd, u8 addr, u16 val);
  99
 100 typedef int (*ad5686_read_func)(struct ad5686_state *st, u8 addr);
 101
 102 /**
 103  * struct ad5686_chip_info - chip specific information
 104  * @int_vref_mv:        AD5620/40/60: the internal reference voltage
 105  * @num_channels:       number of channels
 106  * @channel:            channel specification
 107  * @regmap_type:        register map layout variant
 108  */
 109
 110 struct ad5686_chip_info {
 111         u16                             int_vref_mv;
 112         unsigned int                    num_channels;
 113         const struct iio_chan_spec      *channels;
 114         enum ad5686_regmap_type         regmap_type;
 115 };
 116
 117 /**
 118  * struct ad5446_state - driver instance specific data
 119  * @spi:                spi_device
 120  * @chip_info:          chip model specific constants, available modes etc
 121  * @reg:                supply regulator
 122  * @vref_mv:            actual reference voltage used
 123  * @pwr_down_mask:      power down mask
 124  * @pwr_down_mode:      current power down mode
 125  * @use_internal_vref:  set to true if the internal reference voltage is used
 126  * @lock                lock to protect the data buffer during regmap ops
 127  * @data:               spi transfer buffers
 128  */
 129
 130 struct ad5686_state {
 131         struct device                   *dev;
 132         const struct ad5686_chip_info   *chip_info;
 133         struct regulator                *reg;
 134         unsigned short                  vref_mv;
 135         unsigned int                    pwr_down_mask;
 136         unsigned int                    pwr_down_mode;
 137         ad5686_write_func               write;
 138         ad5686_read_func                read;
 139         bool                            use_internal_vref;
 140         struct mutex                    lock;
 141
 142         /*
 143          * DMA (thus cache coherency maintenance) may require the
 144          * transfer buffers to live in their own cache lines.
 145          */
 146
 147         union {
 148                 __be32 d32;
 149                 __be16 d16;
 150                 u8 d8[4];
 151         } data[3] __aligned(IIO_DMA_MINALIGN);
 152 };
 153
 154
 155 int ad5686_probe(struct device *dev,
 156                  enum ad5686_supported_device_ids chip_type,
 157                  const char *name, ad5686_write_func write,
 158                  ad5686_read_func read);
 159
 160 void ad5686_remove(struct device *dev);
 161
 162
 163 #endif /* __DRIVERS_IIO_DAC_AD5686_H__ */