drivers/staging/iio/iio_simple_dummy.h

   1 /**
   2  * Copyright (c) 2011 Jonathan Cameron
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * Join together the various functionality of iio_simple_dummy driver
   9  */
  10
  11 #ifndef _IIO_SIMPLE_DUMMY_H_
  12 #define _IIO_SIMPLE_DUMMY_H_
  13 #include <linux/kernel.h>
  14
  15 struct iio_dummy_accel_calibscale;
  16 struct iio_dummy_regs;
  17
  18 /**
  19  * struct iio_dummy_state - device instance specific state.
  20  * @dac_val:                    cache for dac value
  21  * @single_ended_adc_val:       cache for single ended adc value
  22  * @differential_adc_val:       cache for differential adc value
  23  * @accel_val:                  cache for acceleration value
  24  * @accel_calibbias:            cache for acceleration calibbias
  25  * @accel_calibscale:           cache for acceleration calibscale
  26  * @lock:                       lock to ensure state is consistent
  27  * @event_irq:                  irq number for event line (faked)
  28  * @event_val:                  cache for event theshold value
  29  * @event_en:                   cache of whether event is enabled
  30  */
  31 struct iio_dummy_state {
  32         int dac_val;
  33         int single_ended_adc_val;
  34         int differential_adc_val[2];
  35         int accel_val;
  36         int accel_calibbias;
  37         const struct iio_dummy_accel_calibscale *accel_calibscale;
  38         struct mutex lock;
  39         struct iio_dummy_regs *regs;
  40 #ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
  41         int event_irq;
  42         int event_val;
  43         bool event_en;
  44 #endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
  45 };
  46
  47 #ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
  48
  49 struct iio_dev;
  50
  51 int iio_simple_dummy_read_event_config(struct iio_dev *indio_dev,
  52                                        const struct iio_chan_spec *chan,
  53                                        enum iio_event_type type,
  54                                        enum iio_event_direction dir);
  55
  56 int iio_simple_dummy_write_event_config(struct iio_dev *indio_dev,
  57                                         const struct iio_chan_spec *chan,
  58                                         enum iio_event_type type,
  59                                         enum iio_event_direction dir,
  60                                         int state);
  61
  62 int iio_simple_dummy_read_event_value(struct iio_dev *indio_dev,
  63                                       const struct iio_chan_spec *chan,
  64                                       enum iio_event_type type,
  65                                       enum iio_event_direction dir,
  66                                       enum iio_event_info info, int *val,
  67                                       int *val2);
  68
  69 int iio_simple_dummy_write_event_value(struct iio_dev *indio_dev,
  70                                        const struct iio_chan_spec *chan,
  71                                        enum iio_event_type type,
  72                                        enum iio_event_direction dir,
  73                                        enum iio_event_info info, int val,
  74                                        int val2);
  75
  76 int iio_simple_dummy_events_register(struct iio_dev *indio_dev);
  77 int iio_simple_dummy_events_unregister(struct iio_dev *indio_dev);
  78
  79 #else /* Stubs for when events are disabled at compile time */
  80
  81 static inline int
  82 iio_simple_dummy_events_register(struct iio_dev *indio_dev)
  83 {
  84         return 0;
  85 };
  86
  87 static inline int
  88 iio_simple_dummy_events_unregister(struct iio_dev *indio_dev)
  89 {
  90         return 0;
  91 };
  92
  93 #endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS*/
  94
  95 /**
  96  * enum iio_simple_dummy_scan_elements - scan index enum
  97  * @voltage0:           the single ended voltage channel
  98  * @diffvoltage1m2:     first differential channel
  99  * @diffvoltage3m4:     second differenial channel
 100  * @accelx:             acceleration channel
 101  *
 102  * Enum provides convenient numbering for the scan index.
 103  */
 104 enum iio_simple_dummy_scan_elements {
 105         voltage0,
 106         diffvoltage1m2,
 107         diffvoltage3m4,
 108         accelx,
 109 };
 110
 111 #ifdef CONFIG_IIO_SIMPLE_DUMMY_BUFFER
 112 int iio_simple_dummy_configure_buffer(struct iio_dev *indio_dev,
 113         const struct iio_chan_spec *channels, unsigned int num_channels);
 114 void iio_simple_dummy_unconfigure_buffer(struct iio_dev *indio_dev);
 115 #else
 116 static inline int iio_simple_dummy_configure_buffer(struct iio_dev *indio_dev,
 117         const struct iio_chan_spec *channels, unsigned int num_channels)
 118 {
 119         return 0;
 120 };
 121 static inline
 122 void iio_simple_dummy_unconfigure_buffer(struct iio_dev *indio_dev)
 123 {};
 124
 125 #endif /* CONFIG_IIO_SIMPLE_DUMMY_BUFFER */
 126 #endif /* _IIO_SIMPLE_DUMMY_H_ */