// SPDX-License-Identifier: GPL-2.0-only /* * Analog Devices AD9467 SPI ADC driver * * Copyright 2012-2020 Analog Devices Inc. */ #include <linux/bitmap.h> #include <linux/bitops.h> #include <linux/cleanup.h> #include <linux/debugfs.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/spi/spi.h> #include <linux/seq_file.h> #include <linux/err.h> #include <linux/delay.h> #include <linux/gpio/consumer.h> #include <linux/of.h> #include <linux/iio/backend.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/clk.h> /* * ADI High-Speed ADC common spi interface registers * See Application-Note AN-877: * https://www.analog.com/media/en/technical-documentation/application-notes/AN-877.pdf */ #define AN877_ADC_REG_CHIP_PORT_CONF … #define AN877_ADC_REG_CHIP_ID … #define AN877_ADC_REG_CHIP_GRADE … #define AN877_ADC_REG_CHAN_INDEX … #define AN877_ADC_REG_TRANSFER … #define AN877_ADC_REG_MODES … #define AN877_ADC_REG_TEST_IO … #define AN877_ADC_REG_ADC_INPUT … #define AN877_ADC_REG_OFFSET … #define AN877_ADC_REG_OUTPUT_MODE … #define AN877_ADC_REG_OUTPUT_ADJUST … #define AN877_ADC_REG_OUTPUT_PHASE … #define AN877_ADC_REG_OUTPUT_DELAY … #define AN877_ADC_REG_VREF … #define AN877_ADC_REG_ANALOG_INPUT … /* AN877_ADC_REG_TEST_IO */ #define AN877_ADC_TESTMODE_OFF … #define AN877_ADC_TESTMODE_MIDSCALE_SHORT … #define AN877_ADC_TESTMODE_POS_FULLSCALE … #define AN877_ADC_TESTMODE_NEG_FULLSCALE … #define AN877_ADC_TESTMODE_ALT_CHECKERBOARD … #define AN877_ADC_TESTMODE_PN23_SEQ … #define AN877_ADC_TESTMODE_PN9_SEQ … #define AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE … #define AN877_ADC_TESTMODE_USER … #define AN877_ADC_TESTMODE_BIT_TOGGLE … #define AN877_ADC_TESTMODE_SYNC … #define AN877_ADC_TESTMODE_ONE_BIT_HIGH … #define AN877_ADC_TESTMODE_MIXED_BIT_FREQUENCY … #define AN877_ADC_TESTMODE_RAMP … /* AN877_ADC_REG_TRANSFER */ #define AN877_ADC_TRANSFER_SYNC … /* AN877_ADC_REG_OUTPUT_MODE */ #define AN877_ADC_OUTPUT_MODE_OFFSET_BINARY … #define AN877_ADC_OUTPUT_MODE_TWOS_COMPLEMENT … #define AN877_ADC_OUTPUT_MODE_GRAY_CODE … /* AN877_ADC_REG_OUTPUT_PHASE */ #define AN877_ADC_OUTPUT_EVEN_ODD_MODE_EN … #define AN877_ADC_INVERT_DCO_CLK … /* AN877_ADC_REG_OUTPUT_DELAY */ #define AN877_ADC_DCO_DELAY_ENABLE … /* * Analog Devices AD9265 16-Bit, 125/105/80 MSPS ADC */ #define CHIPID_AD9265 … #define AD9265_DEF_OUTPUT_MODE … #define AD9265_REG_VREF_MASK … /* * Analog Devices AD9434 12-Bit, 370/500 MSPS ADC */ #define CHIPID_AD9434 … #define AD9434_DEF_OUTPUT_MODE … #define AD9434_REG_VREF_MASK … /* * Analog Devices AD9467 16-Bit, 200/250 MSPS ADC */ #define CHIPID_AD9467 … #define AD9467_DEF_OUTPUT_MODE … #define AD9467_REG_VREF_MASK … /* * Analog Devices AD9643 14-Bit, 170/210/250 MSPS ADC */ #define CHIPID_AD9643 … #define AD9643_REG_VREF_MASK … /* * Analog Devices AD9652 16-bit 310 MSPS ADC */ #define CHIPID_AD9652 … #define AD9652_REG_VREF_MASK … /* * Analog Devices AD9649 14-bit 20/40/65/80 MSPS ADC */ #define CHIPID_AD9649 … #define AD9649_TEST_POINTS … #define AD9647_MAX_TEST_POINTS … #define AD9467_CAN_INVERT(st) … struct ad9467_chip_info { … }; struct ad9467_chan_test_mode { … }; struct ad9467_state { … }; static int ad9467_spi_read(struct ad9467_state *st, unsigned int reg) { … } static int ad9467_spi_write(struct ad9467_state *st, unsigned int reg, unsigned int val) { … } static int ad9467_reg_access(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, unsigned int *readval) { … } static const unsigned int ad9265_scale_table[][2] = …; static const unsigned int ad9434_scale_table[][2] = …; static const unsigned int ad9467_scale_table[][2] = …; static const unsigned int ad9643_scale_table[][2] = …; static const unsigned int ad9649_scale_table[][2] = …; static const unsigned int ad9652_scale_table[][2] = …; static void __ad9467_get_scale(struct ad9467_state *st, int index, unsigned int *val, unsigned int *val2) { … } #define AD9467_CHAN(_chan, avai_mask, _si, _bits, _sign) … static const struct iio_chan_spec ad9434_channels[] = …; static const struct iio_chan_spec ad9467_channels[] = …; static const struct iio_chan_spec ad9643_channels[] = …; static const struct iio_chan_spec ad9649_channels[] = …; static const struct iio_chan_spec ad9652_channels[] = …; static const char * const ad9467_test_modes[] = …; static const struct ad9467_chip_info ad9467_chip_tbl = …; static const struct ad9467_chip_info ad9434_chip_tbl = …; static const struct ad9467_chip_info ad9265_chip_tbl = …; static const struct ad9467_chip_info ad9643_chip_tbl = …; static const struct ad9467_chip_info ad9649_chip_tbl = …; static const struct ad9467_chip_info ad9652_chip_tbl = …; static int ad9467_get_scale(struct ad9467_state *st, int *val, int *val2) { … } static int ad9467_set_scale(struct ad9467_state *st, int val, int val2) { … } static int ad9467_outputmode_set(struct ad9467_state *st, unsigned int mode) { … } static int ad9467_testmode_set(struct ad9467_state *st, unsigned int chan, unsigned int test_mode) { … } static int ad9467_backend_testmode_on(struct ad9467_state *st, unsigned int chan, enum iio_backend_test_pattern pattern) { … } static int ad9467_backend_testmode_off(struct ad9467_state *st, unsigned int chan) { … } static int ad9647_calibrate_prepare(struct ad9467_state *st) { … } static int ad9647_calibrate_polarity_set(struct ad9467_state *st, bool invert) { … } /* * The idea is pretty simple. Find the max number of successful points in a row * and get the one in the middle. */ static unsigned int ad9467_find_optimal_point(const unsigned long *calib_map, unsigned int start, unsigned int nbits, unsigned int *val) { … } static int ad9467_calibrate_apply(struct ad9467_state *st, unsigned int val) { … } static int ad9647_calibrate_stop(struct ad9467_state *st) { … } static int ad9467_calibrate(struct ad9467_state *st) { … } static int ad9467_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long m) { … } static int ad9467_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static int ad9467_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { … } static int ad9467_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask) { … } static struct iio_info ad9467_info = …; static int ad9467_scale_fill(struct ad9467_state *st) { … } static int ad9467_reset(struct device *dev) { … } static int ad9467_iio_backend_get(struct ad9467_state *st) { … } static int ad9467_test_mode_available_show(struct seq_file *s, void *ignored) { … } DEFINE_SHOW_ATTRIBUTE(…); static ssize_t ad9467_chan_test_mode_read(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { … } static ssize_t ad9467_chan_test_mode_write(struct file *file, const char __user *userbuf, size_t count, loff_t *ppos) { … } static const struct file_operations ad9467_chan_test_mode_fops = …; static ssize_t ad9467_dump_calib_table(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { … } static const struct file_operations ad9467_calib_table_fops = …; static void ad9467_debugfs_init(struct iio_dev *indio_dev) { … } static int ad9467_probe(struct spi_device *spi) { … } static const struct of_device_id ad9467_of_match[] = …; MODULE_DEVICE_TABLE(of, ad9467_of_match); static const struct spi_device_id ad9467_ids[] = …; MODULE_DEVICE_TABLE(spi, ad9467_ids); static struct spi_driver ad9467_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_IMPORT_NS(…);
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