linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Texas Instruments ADS7950 SPI ADC driver

 *

 * Copyright 2016 David Lechner <david@lechnology.com>

 *

 * Based on iio/ad7923.c:

 * Copyright 2011 Analog Devices Inc

 * Copyright 2012 CS Systemes d'Information

 *

 * And also on hwmon/ads79xx.c

 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/

 *  Nishanth Menon

 */

​

#include <linux/acpi.h>

#include <linux/bitops.h>

#include <linux/device.h>

#include <linux/err.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/regulator/consumer.h>

#include <linux/slab.h>

#include <linux/spi/spi.h>

​

#include <linux/iio/buffer.h>

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

#include <linux/iio/trigger_consumer.h>

#include <linux/iio/triggered_buffer.h>

​

/*

 * In case of ACPI, we use the 5000 mV as default for the reference pin.

 * Device tree users encode that via the vref-supply regulator.

 */

#define TI_ADS7950_VA_MV_ACPI_DEFAULT   5000

​

#define TI_ADS7950_CR_MANUAL    BIT(12)

#define TI_ADS7950_CR_WRITE BIT(11)

#define TI_ADS7950_CR_CHAN(ch)  ((ch) << 7)

#define TI_ADS7950_CR_RANGE_5V  BIT(6)

​

#define TI_ADS7950_MAX_CHAN 16

​

#define TI_ADS7950_TIMESTAMP_SIZE (sizeof(int64_t) / sizeof(__be16))

​

/* val = value, dec = left shift, bits = number of bits of the mask */

#define TI_ADS7950_EXTRACT(val, dec, bits) \

    (((val) >> (dec)) & ((1 << (bits)) - 1))

​

struct ti_ads7950_state {

    struct spi_device   *spi;

    struct spi_transfer ring_xfer;

    struct spi_transfer scan_single_xfer[3];

    struct spi_message  ring_msg;

    struct spi_message  scan_single_msg;

​

    struct regulator    *reg;

    unsigned int        vref_mv;

​

    unsigned int        settings;

​