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 30struct 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 * @bits: accuracy of the adc in bits 47 * @bits: output coding [s]igned or [u]nsigned 48 * @int_vref_mv: the internal reference voltage 49 * @num_channels: number of physical inputs on chip 50 */ 51 52struct ad7606_chip_info { 53 char name[10]; 54 u8 bits; 55 char sign; 56 u16 int_vref_mv; 57 unsigned num_channels; 58}; 59 60/** 61 * struct ad7606_state - driver instance specific data 62 */ 63 64struct ad7606_state { 65 struct iio_dev *indio_dev; 66 struct device *dev; 67 const struct ad7606_chip_info *chip_info; 68 struct ad7606_platform_data *pdata; 69 struct regulator *reg; 70 struct work_struct poll_work; 71 wait_queue_head_t wq_data_avail; 72 atomic_t protect_ring; 73 size_t d_size; 74 const struct ad7606_bus_ops *bops; 75 int irq; 76 unsigned id; 77 unsigned range; 78 unsigned oversampling; 79 bool done; 80 bool have_frstdata; 81 bool have_os; 82 bool have_stby; 83 bool have_reset; 84 bool have_range; 85 void __iomem *base_address; 86 87 /* 88 * DMA (thus cache coherency maintenance) requires the 89 * transfer buffers to live in their own cache lines. 90 */ 91 92 unsigned short data[8] ____cacheline_aligned; 93}; 94 95struct ad7606_bus_ops { 96 /* more methods added in future? */ 97 int (*read_block)(struct device *, int, void *); 98}; 99 100void ad7606_suspend(struct ad7606_state *st); 101void ad7606_resume(struct ad7606_state *st); 102struct ad7606_state *ad7606_probe(struct device *dev, int irq, 103 void __iomem *base_address, unsigned id, 104 const struct ad7606_bus_ops *bops); 105int ad7606_remove(struct ad7606_state *st); 106int ad7606_reset(struct ad7606_state *st); 107 108enum ad7606_supported_device_ids { 109 ID_AD7606_8, 110 ID_AD7606_6, 111 ID_AD7606_4 112}; 113 114int ad7606_scan_from_ring(struct ad7606_state *st, unsigned ch); 115int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev); 116void ad7606_ring_cleanup(struct iio_dev *indio_dev); 117#endif /* IIO_ADC_AD7606_H_ */ 118