Edit File: ad_sigma_delta.h
/* * Support code for Analog Devices Sigma-Delta ADCs * * Copyright 2012 Analog Devices Inc. * Author: Lars-Peter Clausen <lars@metafoo.de> * * Licensed under the GPL-2. */ #ifndef __AD_SIGMA_DELTA_H__ #define __AD_SIGMA_DELTA_H__ enum ad_sigma_delta_mode { AD_SD_MODE_CONTINUOUS = 0, AD_SD_MODE_SINGLE = 1, AD_SD_MODE_IDLE = 2, AD_SD_MODE_POWERDOWN = 3, }; /** * struct ad_sigma_delta_calib_data - Calibration data for Sigma Delta devices * @mode: Calibration mode. * @channel: Calibration channel. */ struct ad_sd_calib_data { unsigned int mode; unsigned int channel; }; struct ad_sigma_delta; struct iio_dev; /** * struct ad_sigma_delta_info - Sigma Delta driver specific callbacks and options * @set_channel: Will be called to select the current channel, may be NULL. * @set_mode: Will be called to select the current mode, may be NULL. * @postprocess_sample: Is called for each sampled data word, can be used to * modify or drop the sample data, it, may be NULL. * @has_registers: true if the device has writable and readable registers, false * if there is just one read-only sample data shift register. * @addr_shift: Shift of the register address in the communications register. * @read_mask: Mask for the communications register having the read bit set. */ struct ad_sigma_delta_info { int (*set_channel)(struct ad_sigma_delta *, unsigned int channel); int (*set_mode)(struct ad_sigma_delta *, enum ad_sigma_delta_mode mode); int (*postprocess_sample)(struct ad_sigma_delta *, unsigned int raw_sample); bool has_registers; unsigned int addr_shift; unsigned int read_mask; }; /** * struct ad_sigma_delta - Sigma Delta device struct * @spi: The spi device associated with the Sigma Delta device. * @trig: The IIO trigger associated with the Sigma Delta device. * * Most of the fields are private to the sigma delta library code and should not * be accessed by individual drivers. */ struct ad_sigma_delta { struct spi_device *spi; struct iio_trigger *trig; /* private: */ struct completion completion; bool irq_dis; bool bus_locked; uint8_t comm; const struct ad_sigma_delta_info *info; /* * DMA (thus cache coherency maintenance) requires the * transfer buffers to live in their own cache lines. */ uint8_t data[4] ____cacheline_aligned; }; static inline int ad_sigma_delta_set_channel(struct ad_sigma_delta *sd, unsigned int channel) { if (sd->info->set_channel) return sd->info->set_channel(sd, channel); return 0; } static inline int ad_sigma_delta_set_mode(struct ad_sigma_delta *sd, unsigned int mode) { if (sd->info->set_mode) return sd->info->set_mode(sd, mode); return 0; } static inline int ad_sigma_delta_postprocess_sample(struct ad_sigma_delta *sd, unsigned int raw_sample) { if (sd->info->postprocess_sample) return sd->info->postprocess_sample(sd, raw_sample); return 0; } void ad_sd_set_comm(struct ad_sigma_delta *sigma_delta, uint8_t comm); int ad_sd_write_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg, unsigned int size, unsigned int val); int ad_sd_read_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg, unsigned int size, unsigned int *val); int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, int *val); int ad_sd_calibrate_all(struct ad_sigma_delta *sigma_delta, const struct ad_sd_calib_data *cd, unsigned int n); int ad_sd_init(struct ad_sigma_delta *sigma_delta, struct iio_dev *indio_dev, struct spi_device *spi, const struct ad_sigma_delta_info *info); int ad_sd_setup_buffer_and_trigger(struct iio_dev *indio_dev); void ad_sd_cleanup_buffer_and_trigger(struct iio_dev *indio_dev); int ad_sd_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig); #define __AD_SD_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ _storagebits, _shift, _extend_name, _type) \ { \ .type = (_type), \ .differential = (_channel2 == -1 ? 0 : 1), \ .indexed = 1, \ .channel = (_channel1), \ .channel2 = (_channel2), \ .address = (_address), \ .extend_name = (_extend_name), \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ BIT(IIO_CHAN_INFO_OFFSET), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ .scan_index = (_si), \ .scan_type = { \ .sign = 'u', \ .realbits = (_bits), \ .storagebits = (_storagebits), \ .shift = (_shift), \ .endianness = IIO_BE, \ }, \ } #define AD_SD_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ _storagebits, _shift) \ __AD_SD_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ _storagebits, _shift, NULL, IIO_VOLTAGE) #define AD_SD_SHORTED_CHANNEL(_si, _channel, _address, _bits, \ _storagebits, _shift) \ __AD_SD_CHANNEL(_si, _channel, _channel, _address, _bits, \ _storagebits, _shift, "shorted", IIO_VOLTAGE) #define AD_SD_CHANNEL(_si, _channel, _address, _bits, \ _storagebits, _shift) \ __AD_SD_CHANNEL(_si, _channel, -1, _address, _bits, \ _storagebits, _shift, NULL, IIO_VOLTAGE) #define AD_SD_TEMP_CHANNEL(_si, _address, _bits, _storagebits, _shift) \ __AD_SD_CHANNEL(_si, 0, -1, _address, _bits, \ _storagebits, _shift, NULL, IIO_TEMP) #define AD_SD_SUPPLY_CHANNEL(_si, _channel, _address, _bits, _storagebits, \ _shift) \ __AD_SD_CHANNEL(_si, _channel, -1, _address, _bits, \ _storagebits, _shift, "supply", IIO_VOLTAGE) #endif