// SPDX-License-Identifier: GPL-2.0-only /* * iio/adc/max1027.c * Copyright (C) 2014 Philippe Reynes * * based on linux/drivers/iio/ad7923.c * Copyright 2011 Analog Devices Inc (from AD7923 Driver) * Copyright 2012 CS Systemes d'Information * * max1027.c * * Partial support for max1027 and similar chips. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/spi/spi.h> #include <linux/delay.h> #include <linux/iio/iio.h> #include <linux/iio/buffer.h> #include <linux/iio/trigger.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> #define MAX1027_CONV_REG … #define MAX1027_SETUP_REG … #define MAX1027_AVG_REG … #define MAX1027_RST_REG … /* conversion register */ #define MAX1027_TEMP … #define MAX1027_SCAN_0_N … #define MAX1027_SCAN_N_M … #define MAX1027_SCAN_N … #define MAX1027_NOSCAN … #define MAX1027_CHAN(n) … /* setup register */ #define MAX1027_UNIPOLAR … #define MAX1027_BIPOLAR … #define MAX1027_REF_MODE0 … #define MAX1027_REF_MODE1 … #define MAX1027_REF_MODE2 … #define MAX1027_REF_MODE3 … #define MAX1027_CKS_MODE0 … #define MAX1027_CKS_MODE1 … #define MAX1027_CKS_MODE2 … #define MAX1027_CKS_MODE3 … /* averaging register */ #define MAX1027_NSCAN_4 … #define MAX1027_NSCAN_8 … #define MAX1027_NSCAN_12 … #define MAX1027_NSCAN_16 … #define MAX1027_NAVG_4 … #define MAX1027_NAVG_8 … #define MAX1027_NAVG_16 … #define MAX1027_NAVG_32 … #define MAX1027_AVG_EN … /* Device can achieve 300ksps so we assume a 3.33us conversion delay */ #define MAX1027_CONVERSION_UDELAY … enum max1027_id { … }; static const struct spi_device_id max1027_id[] = …; MODULE_DEVICE_TABLE(spi, max1027_id); static const struct of_device_id max1027_adc_dt_ids[] = …; MODULE_DEVICE_TABLE(of, max1027_adc_dt_ids); #define MAX1027_V_CHAN(index, depth) … #define MAX1027_T_CHAN … #define MAX1X27_CHANNELS(depth) … #define MAX1X29_CHANNELS(depth) … #define MAX1X31_CHANNELS(depth) … static const struct iio_chan_spec max1027_channels[] = …; static const struct iio_chan_spec max1029_channels[] = …; static const struct iio_chan_spec max1031_channels[] = …; static const struct iio_chan_spec max1227_channels[] = …; static const struct iio_chan_spec max1229_channels[] = …; static const struct iio_chan_spec max1231_channels[] = …; /* * These devices are able to scan from 0 to N, N being the highest voltage * channel requested by the user. The temperature can be included or not, * but cannot be retrieved alone. Based on the below * ->available_scan_masks, the core will select the most appropriate * ->active_scan_mask and the "minimum" number of channels will be * scanned and pushed to the buffers. * * For example, if the user wants channels 1, 4 and 5, all channels from * 0 to 5 will be scanned and pushed to the IIO buffers. The core will then * filter out the unneeded samples based on the ->active_scan_mask that has * been selected and only channels 1, 4 and 5 will be available to the user * in the shared buffer. */ #define MAX1X27_SCAN_MASK_TEMP … #define MAX1X27_SCAN_MASKS(temp) … #define MAX1X29_SCAN_MASKS(temp) … #define MAX1X31_SCAN_MASKS(temp) … static const unsigned long max1027_available_scan_masks[] = …; static const unsigned long max1029_available_scan_masks[] = …; static const unsigned long max1031_available_scan_masks[] = …; struct max1027_chip_info { … }; static const struct max1027_chip_info max1027_chip_info_tbl[] = …; struct max1027_state { … }; static int max1027_wait_eoc(struct iio_dev *indio_dev) { … } /* Scan from chan 0 to the highest requested channel. Include temperature on demand. */ static int max1027_configure_chans_and_start(struct iio_dev *indio_dev) { … } static int max1027_enable_trigger(struct iio_dev *indio_dev, bool enable) { … } static int max1027_read_single_value(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val) { … } static int max1027_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static int max1027_debugfs_reg_access(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, unsigned int *readval) { … } static int max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state) { … } static int max1027_read_scan(struct iio_dev *indio_dev) { … } static irqreturn_t max1027_handler(int irq, void *private) { … } static irqreturn_t max1027_trigger_handler(int irq, void *private) { … } static const struct iio_trigger_ops max1027_trigger_ops = …; static const struct iio_info max1027_info = …; static int max1027_probe(struct spi_device *spi) { … } static struct spi_driver max1027_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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