linux-imx

/*

 * Analog devices AD5380, AD5381, AD5382, AD5383, AD5390, AD5391, AD5392

 * multi-channel Digital to Analog Converters driver

 *

 * Copyright 2011 Analog Devices Inc.

 *

 * Licensed under the GPL-2.

 */

​

#include <linux/device.h>

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/spi/spi.h>

#include <linux/slab.h>

#include <linux/sysfs.h>

#include <linux/regmap.h>

#include <linux/regulator/consumer.h>

​

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

​

#define AD5380_REG_DATA(x)  (((x) << 2) | 3)

#define AD5380_REG_OFFSET(x)    (((x) << 2) | 2)

#define AD5380_REG_GAIN(x)  (((x) << 2) | 1)

#define AD5380_REG_SF_PWR_DOWN  (8 << 2)

#define AD5380_REG_SF_PWR_UP    (9 << 2)

#define AD5380_REG_SF_CTRL  (12 << 2)

​

#define AD5380_CTRL_PWR_DOWN_MODE_OFFSET    13

#define AD5380_CTRL_INT_VREF_2V5        BIT(12)

#define AD5380_CTRL_INT_VREF_EN         BIT(10)

​

/**

 * struct ad5380_chip_info - chip specific information

 * @channel_template:   channel specification template

 * @num_channels:   number of channels

 * @int_vref:       internal vref in uV

*/

​

struct ad5380_chip_info {

    struct iio_chan_spec    channel_template;

    unsigned int        num_channels;

    unsigned int        int_vref;

};

​

/**

 * struct ad5380_state - driver instance specific data

 * @regmap:     regmap instance used by the device

 * @chip_info:      chip model specific constants, available modes etc

 * @vref_reg:       vref supply regulator

 * @vref:       actual reference voltage used in uA

 * @pwr_down:       whether the chip is currently in power down mode

 */

​

struct ad5380_state {

    struct regmap           *regmap;

    const struct ad5380_chip_info   *chip_info;

    struct regulator        *vref_reg;

    int             vref;

    bool                pwr_down;

};

​

enum ad5380_type {

    ID_AD5380_3,

    ID_AD5380_5,

    ID_AD5381_3,

    ID_AD5381_5,

    ID_AD5382_3,

    ID_AD5382_5,

    ID_AD5383_3,

    ID_AD5383_5,

    ID_AD5390_3,

    ID_AD5390_5,

    ID_AD5391_3,

    ID_AD5391_5,

    ID_AD5392_3,

    ID_AD5392_5,

};

​

static ssize_t ad5380_read_dac_powerdown(struct iio_dev *indio_dev,

    uintptr_t private, const struct iio_chan_spec *chan, char *buf)

{

    struct ad5380_state *st = iio_priv(indio_dev);

​

    return sprintf(buf, "%d\n", st->pwr_down);

}

​

static ssize_t ad5380_write_dac_powerdown(struct iio_dev *indio_dev,

     uintptr_t private, const struct iio_chan_spec *chan, const char *buf,

     size_t len)