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