156 lines
4.8 KiB
C
156 lines
4.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright 2021 Google LLC.
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*
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* Code shared between most Semtech SAR sensor driver.
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*/
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#ifndef IIO_SX_COMMON_H
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#define IIO_SX_COMMON_H
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#include <linux/iio/iio.h>
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#include <linux/iio/types.h>
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#include <linux/regulator/consumer.h>
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#include <linux/types.h>
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struct device;
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struct i2c_client;
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struct regmap_config;
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struct sx_common_data;
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#define SX_COMMON_REG_IRQ_SRC 0x00
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#define SX_COMMON_MAX_NUM_CHANNELS 4
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static_assert(SX_COMMON_MAX_NUM_CHANNELS < BITS_PER_LONG);
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struct sx_common_reg_default {
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u8 reg;
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u8 def;
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};
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/**
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* struct sx_common_ops: function pointers needed by common code
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*
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* List functions needed by common code to gather information or configure
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* the sensor.
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*
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* @read_prox_data: Function to read raw proximity data.
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* @check_whoami: Set device name based on whoami register.
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* @init_compensation: Function to set initial compensation.
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* @wait_for_sample: When there are no physical IRQ, function to wait for a
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* sample to be ready.
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* @get_default_reg: Populate the initial value for a given register.
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*/
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struct sx_common_ops {
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int (*read_prox_data)(struct sx_common_data *data,
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const struct iio_chan_spec *chan, __be16 *val);
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int (*check_whoami)(struct device *dev, struct iio_dev *indio_dev);
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int (*init_compensation)(struct iio_dev *indio_dev);
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int (*wait_for_sample)(struct sx_common_data *data);
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const struct sx_common_reg_default *
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(*get_default_reg)(struct device *dev, int idx,
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struct sx_common_reg_default *reg_def);
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};
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/**
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* struct sx_common_chip_info: Semtech Sensor private chip information
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*
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* @reg_stat: Main status register address.
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* @reg_irq_msk: IRQ mask register address.
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* @reg_enable_chan: Address to enable/disable channels.
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* Each phase presented by the sensor is an IIO channel..
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* @reg_reset: Reset register address.
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* @mask_enable_chan: Mask over the channels bits in the enable channel
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* register.
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* @stat_offset: Offset to check phase status.
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* @irq_msk_offset: Offset to enable interrupt in the IRQ mask
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* register.
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* @num_channels: Number of channels.
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* @num_default_regs: Number of internal registers that can be configured.
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*
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* @ops: Private functions pointers.
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* @iio_channels: Description of exposed iio channels.
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* @num_iio_channels: Number of iio_channels.
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* @iio_info: iio_info structure for this driver.
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*/
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struct sx_common_chip_info {
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unsigned int reg_stat;
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unsigned int reg_irq_msk;
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unsigned int reg_enable_chan;
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unsigned int reg_reset;
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unsigned int mask_enable_chan;
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unsigned int stat_offset;
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unsigned int irq_msk_offset;
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unsigned int num_channels;
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int num_default_regs;
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struct sx_common_ops ops;
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const struct iio_chan_spec *iio_channels;
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int num_iio_channels;
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struct iio_info iio_info;
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};
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/**
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* struct sx_common_data: Semtech Sensor private data structure.
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*
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* @chip_info: Structure defining sensor internals.
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* @mutex: Serialize access to registers and channel configuration.
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* @completion: completion object to wait for data acquisition.
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* @client: I2C client structure.
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* @trig: IIO trigger object.
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* @regmap: Register map.
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* @num_default_regs: Number of default registers to set at init.
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* @chan_prox_stat: Last reading of the proximity status for each channel.
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* We only send an event to user space when this changes.
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* @trigger_enabled: True when the device trigger is enabled.
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* @buffer: Buffer to store raw samples.
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* @suspend_ctrl: Remember enabled channels and sample rate during suspend.
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* @chan_read: Bit field for each raw channel enabled.
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* @chan_event: Bit field for each event enabled.
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*/
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struct sx_common_data {
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const struct sx_common_chip_info *chip_info;
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struct mutex mutex;
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struct completion completion;
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struct i2c_client *client;
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struct iio_trigger *trig;
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struct regmap *regmap;
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unsigned long chan_prox_stat;
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bool trigger_enabled;
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/* Ensure correct alignment of timestamp when present. */
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struct {
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__be16 channels[SX_COMMON_MAX_NUM_CHANNELS];
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s64 ts __aligned(8);
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} buffer;
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unsigned int suspend_ctrl;
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unsigned long chan_read;
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unsigned long chan_event;
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};
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int sx_common_read_proximity(struct sx_common_data *data,
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const struct iio_chan_spec *chan, int *val);
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int sx_common_read_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir);
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int sx_common_write_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir, int state);
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int sx_common_probe(struct i2c_client *client,
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const struct sx_common_chip_info *chip_info,
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const struct regmap_config *regmap_config);
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/* 3 is the number of events defined by a single phase. */
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extern const struct iio_event_spec sx_common_events[3];
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#endif /* IIO_SX_COMMON_H */
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