linux-imx

/*

 * AD5755, AD5755-1, AD5757, AD5735, AD5737 Digital to analog converters driver

 *

 * Copyright 2012 Analog Devices Inc.

 *

 * Licensed under the GPL-2.

 */

​

#include <linux/device.h>

#include <linux/err.h>

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/spi/spi.h>

#include <linux/slab.h>

#include <linux/sysfs.h>

#include <linux/delay.h>

#include <linux/of.h>

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

#include <linux/platform_data/ad5755.h>

​

#define AD5755_NUM_CHANNELS 4

​

#define AD5755_ADDR(x)          ((x) << 16)

​

#define AD5755_WRITE_REG_DATA(chan) (chan)

#define AD5755_WRITE_REG_GAIN(chan) (0x08 | (chan))

#define AD5755_WRITE_REG_OFFSET(chan)   (0x10 | (chan))

#define AD5755_WRITE_REG_CTRL(chan) (0x1c | (chan))

​

#define AD5755_READ_REG_DATA(chan)  (chan)

#define AD5755_READ_REG_CTRL(chan)  (0x4 | (chan))

#define AD5755_READ_REG_GAIN(chan)  (0x8 | (chan))

#define AD5755_READ_REG_OFFSET(chan)    (0xc | (chan))

#define AD5755_READ_REG_CLEAR(chan) (0x10 | (chan))

#define AD5755_READ_REG_SLEW(chan)  (0x14 | (chan))

#define AD5755_READ_REG_STATUS      0x18

#define AD5755_READ_REG_MAIN        0x19

#define AD5755_READ_REG_DC_DC       0x1a

​

#define AD5755_CTRL_REG_SLEW    0x0

#define AD5755_CTRL_REG_MAIN    0x1

#define AD5755_CTRL_REG_DAC 0x2

#define AD5755_CTRL_REG_DC_DC   0x3

#define AD5755_CTRL_REG_SW  0x4

​

#define AD5755_READ_FLAG 0x800000

​

#define AD5755_NOOP 0x1CE000

​

#define AD5755_DAC_INT_EN           BIT(8)

#define AD5755_DAC_CLR_EN           BIT(7)

#define AD5755_DAC_OUT_EN           BIT(6)

#define AD5755_DAC_INT_CURRENT_SENSE_RESISTOR   BIT(5)

#define AD5755_DAC_DC_DC_EN         BIT(4)

#define AD5755_DAC_VOLTAGE_OVERRANGE_EN     BIT(3)

​

#define AD5755_DC_DC_MAXV           0

#define AD5755_DC_DC_FREQ_SHIFT         2

#define AD5755_DC_DC_PHASE_SHIFT        4

#define AD5755_EXT_DC_DC_COMP_RES       BIT(6)

​

#define AD5755_SLEW_STEP_SIZE_SHIFT     0

#define AD5755_SLEW_RATE_SHIFT          3

#define AD5755_SLEW_ENABLE          BIT(12)

​

/**

 * struct ad5755_chip_info - chip specific information

 * @channel_template:   channel specification

 * @calib_shift:    shift for the calibration data registers

 * @has_voltage_out:    whether the chip has voltage outputs

 */

struct ad5755_chip_info {

    const struct iio_chan_spec channel_template;

    unsigned int calib_shift;

    bool has_voltage_out;

};

​

/**

 * struct ad5755_state - driver instance specific data

 * @spi:    spi device the driver is attached to

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

 * @pwr_down:   bitmask which contains  hether a channel is powered down or not

 * @ctrl:   software shadow of the channel ctrl registers

 * @channels:   iio channel spec for the device

 * @data:   spi transfer buffers

 */

struct ad5755_state {

    struct spi_device       *spi;

    const struct ad5755_chip_info   *chip_info;

    unsigned int            pwr_down;

    unsigned int            ctrl[AD5755_NUM_CHANNELS];