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  */
  18 struct at91_adc_reg_desc {
  19         u8      channel_base;
  20         u32     drdy_mask;
  21         u8      status_register;
  22         u8      trigger_register;
  23 };
  24
  25 /**
  26  * struct at91_adc_trigger - description of triggers
  27  * @name:               name of the trigger advertised to the user
  28  * @value:              value to set in the ADC's trigger setup register
  29                         to enable the trigger
  30  * @is_external:        Does the trigger rely on an external pin?
  31  */
  32 struct at91_adc_trigger {
  33         const char      *name;
  34         u8              value;
  35         bool            is_external;
  36 };
  37
  38 /**
  39  * struct at91_adc_data - platform data for ADC driver
  40  * @channels_used:              channels in use on the board as a bitmask
  41  * @num_channels:               global number of channels available on the board
  42  * @registers:                  Registers definition on the board
  43  * @startup_time:               startup time of the ADC in microseconds
  44  * @trigger_list:               Triggers available in the ADC
  45  * @trigger_number:             Number of triggers available in the ADC
  46  * @use_external_triggers:      does the board has external triggers availables
  47  * @vref:                       Reference voltage for the ADC in millivolts
  48  */
  49 struct at91_adc_data {
  50         unsigned long                   channels_used;
  51         u8                              num_channels;
  52         struct at91_adc_reg_desc        *registers;
  53         u8                              startup_time;
  54         struct at91_adc_trigger         *trigger_list;
  55         u8                              trigger_number;
  56         bool                            use_external_triggers;
  57         u16                             vref;
  58 };
  59
  60 extern void __init at91_add_device_adc(struct at91_adc_data *data);
  61 #endif