Linux kernel mirror (for testing)
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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 */
20struct 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 */
36struct 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 */
53struct 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
64extern void __init at91_add_device_adc(struct at91_adc_data *data);
65#endif