iio:pressure: initial zpa2326 barometer support

Murata ZPA2326 pressure sensor

Pressure sensor from Murata with SPI and I2C bus interfaces.

Required properties:

- compatible: "murata,zpa2326"

- reg: the I2C address or SPI chip select the device will respond to

Recommended properties for SPI bus usage:

- spi-max-frequency: maximum SPI bus frequency as documented in

  Documentation/devicetree/bindings/spi/spi-bus.txt

Optional properties:

- vref-supply: an optional regulator that needs to be on to provide VREF

  power to the sensor

- vdd-supply: an optional regulator that needs to be on to provide VDD

  power to the sensor

- interrupt-parent: phandle to the parent interrupt controller as documented in

  Documentation/devicetree/bindings/interrupt-controller/interrupts.txt

- interrupts: interrupt mapping for IRQ as documented in

  Documentation/devicetree/bindings/interrupt-controller/interrupts.txt

Example:

zpa2326@5c {

	compatible = "murata,zpa2326";

	reg = <0x5c>;

	interrupt-parent = <&gpio>;

	interrupts = <12>;

	vdd-supply = <&ldo_1v8_gnss>;

};

	  This driver can also be built as a module. If so, the module will

	  be called hp206c.

config ZPA2326

	tristate "Murata ZPA2326 pressure sensor driver"

	select IIO_BUFFER

	select IIO_TRIGGERED_BUFFER

	select REGMAP

	select ZPA2326_I2C if I2C

	select ZPA2326_SPI if SPI_MASTER

	help

	  Say Y here to build support for the Murata ZPA2326 pressure and

	  temperature sensor.

	  To compile this driver as a module, choose M here: the module will

	  be called zpa2326.

config ZPA2326_I2C

	tristate

	select REGMAP_I2C

config ZPA2326_SPI

	tristate

	select REGMAP_SPI

endmenu

st_pressure-$(CONFIG_IIO_BUFFER) += st_pressure_buffer.o

obj-$(CONFIG_T5403) += t5403.o

obj-$(CONFIG_HP206C) += hp206c.o

obj-$(CONFIG_ZPA2326) += zpa2326.o

obj-$(CONFIG_ZPA2326_I2C) += zpa2326_i2c.o

obj-$(CONFIG_ZPA2326_SPI) += zpa2326_spi.o

obj-$(CONFIG_IIO_ST_PRESS_I2C) += st_pressure_i2c.o

obj-$(CONFIG_IIO_ST_PRESS_SPI) += st_pressure_spi.o

/*

 * Murata ZPA2326 pressure and temperature sensor IIO driver

 *

 * Copyright (c) 2016 Parrot S.A.

 *

 * Author: Gregor Boirie <gregor.boirie@parrot.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 */

#ifndef _ZPA2326_H

#define _ZPA2326_H

/* Register map. */

#define ZPA2326_REF_P_XL_REG              (0x8)

#define ZPA2326_REF_P_L_REG               (0x9)

#define ZPA2326_REF_P_H_REG               (0xa)

#define ZPA2326_DEVICE_ID_REG             (0xf)

#define ZPA2326_DEVICE_ID                 (0xb9)

#define ZPA2326_RES_CONF_REG              (0x10)

#define ZPA2326_CTRL_REG0_REG             (0x20)

#define ZPA2326_CTRL_REG0_ONE_SHOT        BIT(0)

#define ZPA2326_CTRL_REG0_ENABLE          BIT(1)

#define ZPA2326_CTRL_REG1_REG             (0x21)

#define ZPA2326_CTRL_REG1_MASK_DATA_READY BIT(2)

#define ZPA2326_CTRL_REG2_REG             (0x22)

#define ZPA2326_CTRL_REG2_SWRESET         BIT(2)

#define ZPA2326_CTRL_REG3_REG             (0x23)

#define ZPA2326_CTRL_REG3_ODR_SHIFT       (4)

#define ZPA2326_CTRL_REG3_ENABLE_MEAS     BIT(7)

#define ZPA2326_INT_SOURCE_REG            (0x24)

#define ZPA2326_INT_SOURCE_DATA_READY     BIT(2)

#define ZPA2326_THS_P_LOW_REG             (0x25)

#define ZPA2326_THS_P_HIGH_REG            (0x26)

#define ZPA2326_STATUS_REG                (0x27)

#define ZPA2326_STATUS_P_DA               BIT(1)

#define ZPA2326_STATUS_FIFO_E             BIT(2)

#define ZPA2326_STATUS_P_OR               BIT(5)

#define ZPA2326_PRESS_OUT_XL_REG          (0x28)

#define ZPA2326_PRESS_OUT_L_REG           (0x29)

#define ZPA2326_PRESS_OUT_H_REG           (0x2a)

#define ZPA2326_TEMP_OUT_L_REG            (0x2b)

#define ZPA2326_TEMP_OUT_H_REG            (0x2c)

struct device;

struct regmap;

bool zpa2326_isreg_writeable(struct device *dev, unsigned int reg);

bool zpa2326_isreg_readable(struct device *dev, unsigned int reg);

bool zpa2326_isreg_precious(struct device *dev, unsigned int reg);

/**

 * zpa2326_probe() - Instantiate and register core ZPA2326 IIO device

 * @parent: Hardware sampling device the created IIO device will be a child of.

 * @name:   Arbitrary name to identify the device.

 * @irq:    Interrupt line, negative if none.

 * @hwid:   Expected device hardware id.

 * @regmap: Registers map used to abstract underlying bus accesses.

 *

 * Return: Zero when successful, a negative error code otherwise.

 */

int zpa2326_probe(struct device        *parent,

		  const char           *name,

		  int                   irq,

		  unsigned int          hwid,

		  struct regmap        *regmap);

/**

 * zpa2326_remove() - Unregister and destroy core ZPA2326 IIO device.

 * @parent: Hardware sampling device the IIO device to remove is a child of.

 */

void zpa2326_remove(const struct device *parent);

#ifdef CONFIG_PM

#include <linux/pm.h>

extern const struct dev_pm_ops zpa2326_pm_ops;

#define ZPA2326_PM_OPS (&zpa2326_pm_ops)

#else

#define ZPA2326_PM_OPS (NULL)

#endif

#endif