include/linux/platform_data/at91_adc.h

   1 /*
   2  * Copyright (C) 2011 Free Electrons
   3  *
   4  * Licensed under the GPLv2 or later.
   5  */
   6
   7 #ifndef _AT91_ADC_H_
   8 #define _AT91_ADC_H_
   9
  10 /**
  11  * struct at91_adc_reg_desc - Various informations relative to registers
  12  * @channel_base:       Base offset for the channel data registers
  13  * @drdy_mask:          Mask of the DRDY field in the relevant registers
  14                         (Interruptions registers mostly)
  15  * @status_register:    Offset of the Interrupt Status Register
  16  * @trigger_register:   Offset of the Trigger setup register
  17  * @mr_prescal_mask:    Mask of the PRESCAL field in the adc MR register
  18  * @mr_startup_mask:    Mask of the STARTUP field in the adc MR register
  19  */
  20 struct at91_adc_reg_desc {
  21         u8      channel_base;
  22         u32     drdy_mask;
  23         u8      status_register;
  24         u8      trigger_register;
  25         u32     mr_prescal_mask;
  26         u32     mr_startup_mask;
  27 };
  28
  29 /**
  30  * struct at91_adc_trigger - description of triggers
  31  * @name:               name of the trigger advertised to the user
  32  * @value:              value to set in the ADC's trigger setup register
  33                         to enable the trigger
  34  * @is_external:        Does the trigger rely on an external pin?
  35  */
  36 struct at91_adc_trigger {
  37         const char      *name;
  38         u8              value;
  39         bool            is_external;
  40 };
  41
  42 /**
  43  * struct at91_adc_data - platform data for ADC driver
  44  * @channels_used:              channels in use on the board as a bitmask
  45  * @num_channels:               global number of channels available on the board
  46  * @registers:                  Registers definition on the board
  47  * @startup_time:               startup time of the ADC in microseconds
  48  * @trigger_list:               Triggers available in the ADC
  49  * @trigger_number:             Number of triggers available in the ADC
  50  * @use_external_triggers:      does the board has external triggers availables
  51  * @vref:                       Reference voltage for the ADC in millivolts
  52  */
  53 struct at91_adc_data {
  54         unsigned long                   channels_used;
  55         u8                              num_channels;
  56         struct at91_adc_reg_desc        *registers;
  57         u8                              startup_time;
  58         struct at91_adc_trigger         *trigger_list;
  59         u8                              trigger_number;
  60         bool                            use_external_triggers;
  61         u16                             vref;
  62 };
  63
  64 extern void __init at91_add_device_adc(struct at91_adc_data *data);
  65 #endif