diff options
Diffstat (limited to 'drivers/staging/iio/adc/ad7606.h')
| -rw-r--r-- | drivers/staging/iio/adc/ad7606.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/staging/iio/adc/ad7606.h b/drivers/staging/iio/adc/ad7606.h new file mode 100644 index 000000000000..338bade801a7 --- /dev/null +++ b/drivers/staging/iio/adc/ad7606.h @@ -0,0 +1,117 @@ +/* + * AD7606 ADC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#ifndef IIO_ADC_AD7606_H_ +#define IIO_ADC_AD7606_H_ + +/* + * TODO: struct ad7606_platform_data needs to go into include/linux/iio + */ + +/** + * struct ad7606_platform_data - platform/board specifc information + * @default_os: default oversampling value {0, 2, 4, 8, 16, 32, 64} + * @default_range: default range +/-{5000, 10000} mVolt + * @gpio_convst: number of gpio connected to the CONVST pin + * @gpio_reset: gpio connected to the RESET pin, if not used set to -1 + * @gpio_range: gpio connected to the RANGE pin, if not used set to -1 + * @gpio_os0: gpio connected to the OS0 pin, if not used set to -1 + * @gpio_os1: gpio connected to the OS1 pin, if not used set to -1 + * @gpio_os2: gpio connected to the OS2 pin, if not used set to -1 + * @gpio_frstdata: gpio connected to the FRSTDAT pin, if not used set to -1 + * @gpio_stby: gpio connected to the STBY pin, if not used set to -1 + */ + +struct ad7606_platform_data { + unsigned default_os; + unsigned default_range; + unsigned gpio_convst; + unsigned gpio_reset; + unsigned gpio_range; + unsigned gpio_os0; + unsigned gpio_os1; + unsigned gpio_os2; + unsigned gpio_frstdata; + unsigned gpio_stby; +}; + +/** + * struct ad7606_chip_info - chip specifc information + * @name: indentification string for chip + * @bits: accuracy of the adc in bits + * @bits: output coding [s]igned or [u]nsigned + * @int_vref_mv: the internal reference voltage + * @num_channels: number of physical inputs on chip + */ + +struct ad7606_chip_info { + char name[10]; + u8 bits; + char sign; + u16 int_vref_mv; + unsigned num_channels; +}; + +/** + * struct ad7606_state - driver instance specific data + */ + +struct ad7606_state { + struct iio_dev *indio_dev; + struct device *dev; + const struct ad7606_chip_info *chip_info; + struct ad7606_platform_data *pdata; + struct regulator *reg; + struct work_struct poll_work; + wait_queue_head_t wq_data_avail; + atomic_t protect_ring; + size_t d_size; + const struct ad7606_bus_ops *bops; + int irq; + unsigned id; + unsigned range; + unsigned oversampling; + bool done; + bool have_frstdata; + bool have_os; + bool have_stby; + bool have_reset; + bool have_range; + void __iomem *base_address; + + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + + unsigned short data[8] ____cacheline_aligned; +}; + +struct ad7606_bus_ops { + /* more methods added in future? */ + int (*read_block)(struct device *, int, void *); +}; + +void ad7606_suspend(struct ad7606_state *st); +void ad7606_resume(struct ad7606_state *st); +struct ad7606_state *ad7606_probe(struct device *dev, int irq, + void __iomem *base_address, unsigned id, + const struct ad7606_bus_ops *bops); +int ad7606_remove(struct ad7606_state *st); +int ad7606_reset(struct ad7606_state *st); + +enum ad7606_supported_device_ids { + ID_AD7606_8, + ID_AD7606_6, + ID_AD7606_4 +}; + +int ad7606_scan_from_ring(struct ad7606_state *st, unsigned ch); +int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev); +void ad7606_ring_cleanup(struct iio_dev *indio_dev); +#endif /* IIO_ADC_AD7606_H_ */ |