// SPDX-License-Identifier: GPL-2.0-only /* * iio/adc/max1363.c * Copyright (C) 2008-2010 Jonathan Cameron * * based on linux/drivers/i2c/chips/max123x * Copyright (C) 2002-2004 Stefan Eletzhofer * * based on linux/drivers/acron/char/pcf8583.c * Copyright (C) 2000 Russell King * * Driver for max1363 and similar chips. */ #include <linux/interrupt.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/sysfs.h> #include <linux/list.h> #include <linux/i2c.h> #include <linux/regulator/consumer.h> #include <linux/slab.h> #include <linux/err.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/property.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/events.h> #include <linux/iio/buffer.h> #include <linux/iio/kfifo_buf.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> #define MAX1363_SETUP_BYTE(a) … /* There is a fair bit more defined here than currently * used, but the intention is to support everything these * chips do in the long run */ /* see data sheets */ /* max1363 and max1236, max1237, max1238, max1239 */ #define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD … #define MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF … #define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT … #define MAX1363_SETUP_AIN3_IS_REF_REF_IS_INT … #define MAX1363_SETUP_POWER_UP_INT_REF … #define MAX1363_SETUP_POWER_DOWN_INT_REF … /* think about including max11600 etc - more settings */ #define MAX1363_SETUP_EXT_CLOCK … #define MAX1363_SETUP_INT_CLOCK … #define MAX1363_SETUP_UNIPOLAR … #define MAX1363_SETUP_BIPOLAR … #define MAX1363_SETUP_RESET … #define MAX1363_SETUP_NORESET … /* max1363 only - though don't care on others. * For now monitor modes are not implemented as the relevant * line is not connected on my test board. * The definitions are here as I intend to add this soon. */ #define MAX1363_SETUP_MONITOR_SETUP … /* Specific to the max1363 */ #define MAX1363_MON_RESET_CHAN(a) … #define MAX1363_MON_INT_ENABLE … /* defined for readability reasons */ /* All chips */ #define MAX1363_CONFIG_BYTE(a) … #define MAX1363_CONFIG_SE … #define MAX1363_CONFIG_DE … #define MAX1363_CONFIG_SCAN_TO_CS … #define MAX1363_CONFIG_SCAN_SINGLE_8 … #define MAX1363_CONFIG_SCAN_MONITOR_MODE … #define MAX1363_CONFIG_SCAN_SINGLE_1 … /* max123{6-9} only */ #define MAX1236_SCAN_MID_TO_CHANNEL … /* max1363 only - merely part of channel selects or don't care for others */ #define MAX1363_CONFIG_EN_MON_MODE_READ … #define MAX1363_CHANNEL_SEL(a) … /* max1363 strictly 0x06 - but doesn't matter */ #define MAX1363_CHANNEL_SEL_MASK … #define MAX1363_SCAN_MASK … #define MAX1363_SE_DE_MASK … #define MAX1363_MAX_CHANNELS … /** * struct max1363_mode - scan mode information * @conf: The corresponding value of the configuration register * @modemask: Bit mask corresponding to channels enabled in this mode */ struct max1363_mode { … }; /* This must be maintained along side the max1363_mode_table in max1363_core */ enum max1363_modes { … }; /** * struct max1363_chip_info - chip specifc information * @info: iio core function callbacks structure * @channels: channel specification * @num_channels: number of channels * @mode_list: array of available scan modes * @default_mode: the scan mode in which the chip starts up * @int_vref_mv: the internal reference voltage * @num_modes: number of modes * @bits: accuracy of the adc in bits */ struct max1363_chip_info { … }; /** * struct max1363_state - driver instance specific data * @client: i2c_client * @setupbyte: cache of current device setup byte * @configbyte: cache of current device config byte * @chip_info: chip model specific constants, available modes, etc. * @current_mode: the scan mode of this chip * @requestedmask: a valid requested set of channels * @lock: lock to ensure state is consistent * @monitor_on: whether monitor mode is enabled * @monitor_speed: parameter corresponding to device monitor speed setting * @mask_high: bitmask for enabled high thresholds * @mask_low: bitmask for enabled low thresholds * @thresh_high: high threshold values * @thresh_low: low threshold values * @vref: Reference voltage regulator * @vref_uv: Actual (external or internal) reference voltage * @send: function used to send data to the chip * @recv: function used to receive data from the chip */ struct max1363_state { … }; #define MAX1363_MODE_SINGLE(_num, _mask) … #define MAX1363_MODE_SCAN_TO_CHANNEL(_num, _mask) … /* note not available for max1363 hence naming */ #define MAX1236_MODE_SCAN_MID_TO_CHANNEL(_mid, _num, _mask) … #define MAX1363_MODE_DIFF_SINGLE(_nump, _numm, _mask) … /* Can't think how to automate naming so specify for now */ #define MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(_num, _numvals, _mask) … /* note only available for max1363 hence naming */ #define MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(_num, _numvals, _mask) … static const struct max1363_mode max1363_mode_table[] = …; static const struct max1363_mode *max1363_match_mode(const unsigned long *mask, const struct max1363_chip_info *ci) { … } static int max1363_smbus_send(const struct i2c_client *client, const char *buf, int count) { … } static int max1363_smbus_recv(const struct i2c_client *client, char *buf, int count) { … } static int max1363_write_basic_config(struct max1363_state *st) { … } static int max1363_set_scan_mode(struct max1363_state *st) { … } static int max1363_read_single_chan(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, long m) { … } static int max1363_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long m) { … } /* Applies to max1363 */ static const enum max1363_modes max1363_mode_list[] = …; static const struct iio_event_spec max1363_events[] = …; #define MAX1363_CHAN_U(num, addr, si, bits, ev_spec, num_ev_spec) … /* bipolar channel */ #define MAX1363_CHAN_B(num, num2, addr, si, bits, ev_spec, num_ev_spec) … #define MAX1363_4X_CHANS(bits, ev_spec, num_ev_spec) … static const struct iio_chan_spec max1036_channels[] = …; static const struct iio_chan_spec max1136_channels[] = …; static const struct iio_chan_spec max1236_channels[] = …; static const struct iio_chan_spec max1361_channels[] = …; static const struct iio_chan_spec max1363_channels[] = …; /* Applies to max1236, max1237 */ static const enum max1363_modes max1236_mode_list[] = …; /* Applies to max1238, max1239 */ static const enum max1363_modes max1238_mode_list[] = …; #define MAX1363_12X_CHANS(bits) … static const struct iio_chan_spec max1038_channels[] = …; static const struct iio_chan_spec max1138_channels[] = …; static const struct iio_chan_spec max1238_channels[] = …; static const enum max1363_modes max11607_mode_list[] = …; static const enum max1363_modes max11608_mode_list[] = …; #define MAX1363_8X_CHANS(bits) … static const struct iio_chan_spec max11602_channels[] = …; static const struct iio_chan_spec max11608_channels[] = …; static const struct iio_chan_spec max11614_channels[] = …; static const enum max1363_modes max11644_mode_list[] = …; #define MAX1363_2X_CHANS(bits) … static const struct iio_chan_spec max11646_channels[] = …; static const struct iio_chan_spec max11644_channels[] = …; enum { … }; static const int max1363_monitor_speeds[] = …; static ssize_t max1363_monitor_show_freq(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t max1363_monitor_store_freq(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { … } static IIO_DEV_ATTR_SAMP_FREQ(S_IRUGO | S_IWUSR, max1363_monitor_show_freq, max1363_monitor_store_freq); static IIO_CONST_ATTR(sampling_frequency_available, "133000 665000 33300 16600 8300 4200 2000 1000"); static int max1363_read_thresh(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int *val, int *val2) { … } static int max1363_write_thresh(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int val, int val2) { … } static const u64 max1363_event_codes[] = …; static irqreturn_t max1363_event_handler(int irq, void *private) { … } static int max1363_read_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir) { … } static int max1363_monitor_mode_update(struct max1363_state *st, int enabled) { … } /* * To keep this manageable we always use one of 3 scan modes. * Scan 0...3, 0-1,2-3 and 1-0,3-2 */ static inline int __max1363_check_event_mask(int thismask, int checkmask) { … } static int max1363_write_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, int state) { … } /* * As with scan_elements, only certain sets of these can * be combined. */ static struct attribute *max1363_event_attributes[] = …; static const struct attribute_group max1363_event_attribute_group = …; static int max1363_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask) { … } static const struct iio_info max1238_info = …; static const struct iio_info max1363_info = …; /* max1363 and max1368 tested - rest from data sheet */ static const struct max1363_chip_info max1363_chip_info_tbl[] = …; static int max1363_initial_setup(struct max1363_state *st) { … } static int max1363_alloc_scan_masks(struct iio_dev *indio_dev) { … } static irqreturn_t max1363_trigger_handler(int irq, void *p) { … } #define MAX1363_COMPATIBLE(of_compatible, cfg) … static const struct of_device_id max1363_of_match[] = …; MODULE_DEVICE_TABLE(of, max1363_of_match); static int max1363_probe(struct i2c_client *client) { … } #define MAX1363_ID_TABLE(_name, cfg) … static const struct i2c_device_id max1363_id[] = …; MODULE_DEVICE_TABLE(i2c, max1363_id); static struct i2c_driver max1363_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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