linux/drivers/iio/chemical/pms7003.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Plantower PMS7003 particulate matter sensor driver
 *
 * Copyright (c) Tomasz Duszynski <[email protected]>
 */

#include <asm/unaligned.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/serdev.h>

#define PMS7003_DRIVER_NAME …

#define PMS7003_MAGIC …
/* last 2 data bytes hold frame checksum */
#define PMS7003_MAX_DATA_LENGTH …
#define PMS7003_CHECKSUM_LENGTH …
#define PMS7003_PM10_OFFSET …
#define PMS7003_PM2P5_OFFSET …
#define PMS7003_PM1_OFFSET …

#define PMS7003_TIMEOUT …
#define PMS7003_CMD_LENGTH …
#define PMS7003_PM_MAX …
#define PMS7003_PM_MIN …

enum { … };

enum pms7003_cmd { … };

/*
 * commands have following format:
 *
 * +------+------+-----+------+-----+-----------+-----------+
 * | 0x42 | 0x4d | cmd | 0x00 | arg | cksum msb | cksum lsb |
 * +------+------+-----+------+-----+-----------+-----------+
 */
static const u8 pms7003_cmd_tbl[][PMS7003_CMD_LENGTH] = …;

struct pms7003_frame { … };

struct pms7003_state { … };

static int pms7003_do_cmd(struct pms7003_state *state, enum pms7003_cmd cmd)
{ … }

static u16 pms7003_get_pm(const u8 *data)
{ … }

static irqreturn_t pms7003_trigger_handler(int irq, void *p)
{ … }

static int pms7003_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{ … }

static const struct iio_info pms7003_info = …;

#define PMS7003_CHAN(_index, _mod, _addr) …

static const struct iio_chan_spec pms7003_channels[] = …;

static u16 pms7003_calc_checksum(struct pms7003_frame *frame)
{ … }

static bool pms7003_frame_is_okay(struct pms7003_frame *frame)
{ … }

static size_t pms7003_receive_buf(struct serdev_device *serdev, const u8 *buf,
				  size_t size)
{ … }

static const struct serdev_device_ops pms7003_serdev_ops = …;

static void pms7003_stop(void *data)
{ … }

static const unsigned long pms7003_scan_masks[] = …;

static int pms7003_probe(struct serdev_device *serdev)
{ … }

static const struct of_device_id pms7003_of_match[] = …;
MODULE_DEVICE_TABLE(of, pms7003_of_match);

static struct serdev_device_driver pms7003_driver = …;
module_serdev_device_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;