drivers/iio/adc/ad7606.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * AD7606 ADC driver
   4  *
   5  * Copyright 2011 Analog Devices Inc.
   6  */
   7
   8 #ifndef IIO_ADC_AD7606_H_
   9 #define IIO_ADC_AD7606_H_
  10
  11 #define AD760X_CHANNEL(num, mask_sep, mask_type, mask_all) {    \
  12                 .type = IIO_VOLTAGE,                            \
  13                 .indexed = 1,                                   \
  14                 .channel = num,                                 \
  15                 .address = num,                                 \
  16                 .info_mask_separate = mask_sep,                 \
  17                 .info_mask_shared_by_type = mask_type,          \
  18                 .info_mask_shared_by_all = mask_all,            \
  19                 .scan_index = num,                              \
  20                 .scan_type = {                                  \
  21                         .sign = 's',                            \
  22                         .realbits = 16,                         \
  23                         .storagebits = 16,                      \
  24                         .endianness = IIO_CPU,                  \
  25                 },                                              \
  26 }
  27
  28 #define AD7605_CHANNEL(num)                             \
  29         AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_RAW),     \
  30                 BIT(IIO_CHAN_INFO_SCALE), 0)
  31
  32 #define AD7606_CHANNEL(num)                             \
  33         AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_RAW),     \
  34                 BIT(IIO_CHAN_INFO_SCALE),               \
  35                 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO))
  36
  37 #define AD7616_CHANNEL(num)     \
  38         AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),\
  39                 0, BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO))
  40
  41 /**
  42  * struct ad7606_chip_info - chip specific information
  43  * @channels:           channel specification
  44  * @num_channels:       number of channels
  45  * @oversampling_avail  pointer to the array which stores the available
  46  *                      oversampling ratios.
  47  * @oversampling_num    number of elements stored in oversampling_avail array
  48  * @os_req_reset        some devices require a reset to update oversampling
  49  * @init_delay_ms       required delay in miliseconds for initialization
  50  *                      after a restart
  51  */
  52 struct ad7606_chip_info {
  53         const struct iio_chan_spec      *channels;
  54         unsigned int                    num_channels;
  55         const unsigned int              *oversampling_avail;
  56         unsigned int                    oversampling_num;
  57         bool                            os_req_reset;
  58         unsigned long                   init_delay_ms;
  59 };
  60
  61 /**
  62  * struct ad7606_state - driver instance specific data
  63  * @dev         pointer to kernel device
  64  * @chip_info           entry in the table of chips that describes this device
  65  * @reg         regulator info for the the power supply of the device
  66  * @bops                bus operations (SPI or parallel)
  67  * @range               voltage range selection, selects which scale to apply
  68  * @oversampling        oversampling selection
  69  * @base_address        address from where to read data in parallel operation
  70  * @sw_mode_en          software mode enabled
  71  * @scale_avail         pointer to the array which stores the available scales
  72  * @num_scales          number of elements stored in the scale_avail array
  73  * @oversampling_avail  pointer to the array which stores the available
  74  *                      oversampling ratios.
  75  * @num_os_ratios       number of elements stored in oversampling_avail array
  76  * @write_scale         pointer to the function which writes the scale
  77  * @write_os            pointer to the function which writes the os
  78  * @lock                protect sensor state from concurrent accesses to GPIOs
  79  * @gpio_convst GPIO descriptor for conversion start signal (CONVST)
  80  * @gpio_reset          GPIO descriptor for device hard-reset
  81  * @gpio_range          GPIO descriptor for range selection
  82  * @gpio_standby        GPIO descriptor for stand-by signal (STBY),
  83  *                      controls power-down mode of device
  84  * @gpio_frstdata       GPIO descriptor for reading from device when data
  85  *                      is being read on the first channel
  86  * @gpio_os             GPIO descriptors to control oversampling on the device
  87  * @complete            completion to indicate end of conversion
  88  * @trig                The IIO trigger associated with the device.
  89  * @data                buffer for reading data from the device
  90  * @d16                 be16 buffer for reading data from the device
  91  */
  92 struct ad7606_state {
  93         struct device                   *dev;
  94         const struct ad7606_chip_info   *chip_info;
  95         struct regulator                *reg;
  96         const struct ad7606_bus_ops     *bops;
  97         unsigned int                    range[16];
  98         unsigned int                    oversampling;
  99         void __iomem                    *base_address;
 100         bool                            sw_mode_en;
 101         const unsigned int              *scale_avail;
 102         unsigned int                    num_scales;
 103         const unsigned int              *oversampling_avail;
 104         unsigned int                    num_os_ratios;
 105         int (*write_scale)(struct iio_dev *indio_dev, int ch, int val);
 106         int (*write_os)(struct iio_dev *indio_dev, int val);
 107
 108         struct mutex                    lock; /* protect sensor state */
 109         struct gpio_desc                *gpio_convst;
 110         struct gpio_desc                *gpio_reset;
 111         struct gpio_desc                *gpio_range;
 112         struct gpio_desc                *gpio_standby;
 113         struct gpio_desc                *gpio_frstdata;
 114         struct gpio_descs               *gpio_os;
 115         struct iio_trigger              *trig;
 116         struct completion               completion;
 117
 118         /*
 119          * DMA (thus cache coherency maintenance) requires the
 120          * transfer buffers to live in their own cache lines.
 121          * 16 * 16-bit samples + 64-bit timestamp
 122          */
 123         unsigned short                  data[20] ____cacheline_aligned;
 124         __be16                          d16[2];
 125 };
 126
 127 /**
 128  * struct ad7606_bus_ops - driver bus operations
 129  * @read_block          function pointer for reading blocks of data
 130  * @sw_mode_config:     pointer to a function which configured the device
 131  *                      for software mode
 132  * @reg_read    function pointer for reading spi register
 133  * @reg_write   function pointer for writing spi register
 134  * @write_mask  function pointer for write spi register with mask
 135  * @rd_wr_cmd   pointer to the function which calculates the spi address
 136  */
 137 struct ad7606_bus_ops {
 138         /* more methods added in future? */
 139         int (*read_block)(struct device *dev, int num, void *data);
 140         int (*sw_mode_config)(struct iio_dev *indio_dev);
 141         int (*reg_read)(struct ad7606_state *st, unsigned int addr);
 142         int (*reg_write)(struct ad7606_state *st,
 143                                 unsigned int addr,
 144                                 unsigned int val);
 145         int (*write_mask)(struct ad7606_state *st,
 146                                  unsigned int addr,
 147                                  unsigned long mask,
 148                                  unsigned int val);
 149         u16 (*rd_wr_cmd)(int addr, char isWriteOp);
 150 };
 151
 152 int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 153                  const char *name, unsigned int id,
 154                  const struct ad7606_bus_ops *bops);
 155
 156 enum ad7606_supported_device_ids {
 157         ID_AD7605_4,
 158         ID_AD7606_8,
 159         ID_AD7606_6,
 160         ID_AD7606_4,
 161         ID_AD7606B,
 162         ID_AD7616,
 163 };
 164
 165 #ifdef CONFIG_PM_SLEEP
 166 extern const struct dev_pm_ops ad7606_pm_ops;
 167 #define AD7606_PM_OPS (&ad7606_pm_ops)
 168 #else
 169 #define AD7606_PM_OPS NULL
 170 #endif
 171
 172 #endif /* IIO_ADC_AD7606_H_ */