drivers/staging/iio/adc/ad7606.h

   1 /*
   2  * AD7606 ADC driver
   3  *
   4  * Copyright 2011 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2.
   7  */
   8
   9 #ifndef IIO_ADC_AD7606_H_
  10 #define IIO_ADC_AD7606_H_
  11
  12 /*
  13  * TODO: struct ad7606_platform_data needs to go into include/linux/iio
  14  */
  15
  16 /**
  17  * struct ad7606_platform_data - platform/board specifc information
  18  * @default_os:         default oversampling value {0, 2, 4, 8, 16, 32, 64}
  19  * @default_range:      default range +/-{5000, 10000} mVolt
  20  * @gpio_convst:        number of gpio connected to the CONVST pin
  21  * @gpio_reset:         gpio connected to the RESET pin, if not used set to -1
  22  * @gpio_range:         gpio connected to the RANGE pin, if not used set to -1
  23  * @gpio_os0:           gpio connected to the OS0 pin, if not used set to -1
  24  * @gpio_os1:           gpio connected to the OS1 pin, if not used set to -1
  25  * @gpio_os2:           gpio connected to the OS2 pin, if not used set to -1
  26  * @gpio_frstdata:      gpio connected to the FRSTDAT pin, if not used set to -1
  27  * @gpio_stby:          gpio connected to the STBY pin, if not used set to -1
  28  */
  29
  30 struct ad7606_platform_data {
  31         unsigned                        default_os;
  32         unsigned                        default_range;
  33         unsigned                        gpio_convst;
  34         unsigned                        gpio_reset;
  35         unsigned                        gpio_range;
  36         unsigned                        gpio_os0;
  37         unsigned                        gpio_os1;
  38         unsigned                        gpio_os2;
  39         unsigned                        gpio_frstdata;
  40         unsigned                        gpio_stby;
  41 };
  42
  43 /**
  44  * struct ad7606_chip_info - chip specifc information
  45  * @name:               indentification string for chip
  46  * @int_vref_mv:        the internal reference voltage
  47  * @channels:           channel specification
  48  * @num_channels:       number of channels
  49  */
  50
  51 struct ad7606_chip_info {
  52         const char                      *name;
  53         u8                              bits;
  54         char                            sign;
  55         u16                             int_vref_mv;
  56         struct iio_chan_spec            *channels;
  57         unsigned                        num_channels;
  58 };
  59
  60 /**
  61  * struct ad7606_state - driver instance specific data
  62  */
  63
  64 struct ad7606_state {
  65         struct device                   *dev;
  66         const struct ad7606_chip_info   *chip_info;
  67         struct ad7606_platform_data     *pdata;
  68         struct regulator                *reg;
  69         struct work_struct              poll_work;
  70         wait_queue_head_t               wq_data_avail;
  71         size_t                          d_size;
  72         const struct ad7606_bus_ops     *bops;
  73         int                             irq;
  74         unsigned                        id;
  75         unsigned                        range;
  76         unsigned                        oversampling;
  77         bool                            done;
  78         bool                            have_frstdata;
  79         bool                            have_os;
  80         bool                            have_stby;
  81         bool                            have_reset;
  82         bool                            have_range;
  83         void __iomem                    *base_address;
  84
  85         /*
  86          * DMA (thus cache coherency maintenance) requires the
  87          * transfer buffers to live in their own cache lines.
  88          */
  89
  90         unsigned short                  data[8] ____cacheline_aligned;
  91 };
  92
  93 struct ad7606_bus_ops {
  94         /* more methods added in future? */
  95         int (*read_block)(struct device *, int, void *);
  96 };
  97
  98 void ad7606_suspend(struct iio_dev *indio_dev);
  99 void ad7606_resume(struct iio_dev *indio_dev);
 100 struct iio_dev *ad7606_probe(struct device *dev, int irq,
 101                               void __iomem *base_address, unsigned id,
 102                               const struct ad7606_bus_ops *bops);
 103 int ad7606_remove(struct iio_dev *indio_dev);
 104 int ad7606_reset(struct ad7606_state *st);
 105
 106 enum ad7606_supported_device_ids {
 107         ID_AD7606_8,
 108         ID_AD7606_6,
 109         ID_AD7606_4
 110 };
 111
 112 int ad7606_scan_from_ring(struct iio_dev *indio_dev, unsigned ch);
 113 int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev);
 114 void ad7606_ring_cleanup(struct iio_dev *indio_dev);
 115 #endif /* IIO_ADC_AD7606_H_ */