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 /**
  12  * struct ad7606_chip_info - chip specific information
  13  * @channels:           channel specification
  14  * @num_channels:       number of channels
  15  * @oversampling_avail  pointer to the array which stores the available
  16  *                      oversampling ratios.
  17  * @oversampling_num    number of elements stored in oversampling_avail array
  18  * @os_req_reset        some devices require a reset to update oversampling
  19  */
  20 struct ad7606_chip_info {
  21         const struct iio_chan_spec      *channels;
  22         unsigned int                    num_channels;
  23         const unsigned int              *oversampling_avail;
  24         unsigned int                    oversampling_num;
  25         bool                            os_req_reset;
  26 };
  27
  28 /**
  29  * struct ad7606_state - driver instance specific data
  30  * @dev         pointer to kernel device
  31  * @chip_info           entry in the table of chips that describes this device
  32  * @reg         regulator info for the the power supply of the device
  33  * @bops                bus operations (SPI or parallel)
  34  * @range               voltage range selection, selects which scale to apply
  35  * @oversampling        oversampling selection
  36  * @base_address        address from where to read data in parallel operation
  37  * @scale_avail         pointer to the array which stores the available scales
  38  * @num_scales          number of elements stored in the scale_avail array
  39  * @oversampling_avail  pointer to the array which stores the available
  40  *                      oversampling ratios.
  41  * @num_os_ratios       number of elements stored in oversampling_avail array
  42  * @lock                protect sensor state from concurrent accesses to GPIOs
  43  * @gpio_convst GPIO descriptor for conversion start signal (CONVST)
  44  * @gpio_reset          GPIO descriptor for device hard-reset
  45  * @gpio_range          GPIO descriptor for range selection
  46  * @gpio_standby        GPIO descriptor for stand-by signal (STBY),
  47  *                      controls power-down mode of device
  48  * @gpio_frstdata       GPIO descriptor for reading from device when data
  49  *                      is being read on the first channel
  50  * @gpio_os             GPIO descriptors to control oversampling on the device
  51  * @complete            completion to indicate end of conversion
  52  * @trig                The IIO trigger associated with the device.
  53  * @data                buffer for reading data from the device
  54  */
  55 struct ad7606_state {
  56         struct device                   *dev;
  57         const struct ad7606_chip_info   *chip_info;
  58         struct regulator                *reg;
  59         const struct ad7606_bus_ops     *bops;
  60         unsigned int                    range;
  61         unsigned int                    oversampling;
  62         void __iomem                    *base_address;
  63         const unsigned int              *scale_avail;
  64         unsigned int                    num_scales;
  65         const unsigned int              *oversampling_avail;
  66         unsigned int                    num_os_ratios;
  67
  68         struct mutex                    lock; /* protect sensor state */
  69         struct gpio_desc                *gpio_convst;
  70         struct gpio_desc                *gpio_reset;
  71         struct gpio_desc                *gpio_range;
  72         struct gpio_desc                *gpio_standby;
  73         struct gpio_desc                *gpio_frstdata;
  74         struct gpio_descs               *gpio_os;
  75         struct iio_trigger              *trig;
  76         struct completion               completion;
  77
  78         /*
  79          * DMA (thus cache coherency maintenance) requires the
  80          * transfer buffers to live in their own cache lines.
  81          * 16 * 16-bit samples + 64-bit timestamp
  82          */
  83         unsigned short                  data[20] ____cacheline_aligned;
  84 };
  85
  86 /**
  87  * struct ad7606_bus_ops - driver bus operations
  88  * @read_block          function pointer for reading blocks of data
  89  */
  90 struct ad7606_bus_ops {
  91         /* more methods added in future? */
  92         int (*read_block)(struct device *dev, int num, void *data);
  93 };
  94
  95 int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
  96                  const char *name, unsigned int id,
  97                  const struct ad7606_bus_ops *bops);
  98
  99 enum ad7606_supported_device_ids {
 100         ID_AD7605_4,
 101         ID_AD7606_8,
 102         ID_AD7606_6,
 103         ID_AD7606_4,
 104         ID_AD7616,
 105 };
 106
 107 #ifdef CONFIG_PM_SLEEP
 108 extern const struct dev_pm_ops ad7606_pm_ops;
 109 #define AD7606_PM_OPS (&ad7606_pm_ops)
 110 #else
 111 #define AD7606_PM_OPS NULL
 112 #endif
 113
 114 #endif /* IIO_ADC_AD7606_H_ */