linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Industrial I/O driver for Microchip digital potentiometers

 * Copyright (c) 2015  Axentia Technologies AB

 * Author: Peter Rosin <peda@axentia.se>

 *

 * Datasheet: http://www.microchip.com/downloads/en/DeviceDoc/22096b.pdf

 *

 * DEVID    #Wipers #Positions  Resistor Opts (kOhm)    i2c address

 * mcp4531  1   129     5, 10, 50, 100          010111x

 * mcp4532  1   129     5, 10, 50, 100          01011xx

 * mcp4541  1   129     5, 10, 50, 100          010111x

 * mcp4542  1   129     5, 10, 50, 100          01011xx

 * mcp4551  1   257     5, 10, 50, 100          010111x

 * mcp4552  1   257     5, 10, 50, 100          01011xx

 * mcp4561  1   257     5, 10, 50, 100          010111x

 * mcp4562  1   257     5, 10, 50, 100          01011xx

 * mcp4631  2   129     5, 10, 50, 100          0101xxx

 * mcp4632  2   129     5, 10, 50, 100          01011xx

 * mcp4641  2   129     5, 10, 50, 100          0101xxx

 * mcp4642  2   129     5, 10, 50, 100          01011xx

 * mcp4651  2   257     5, 10, 50, 100          0101xxx

 * mcp4652  2   257     5, 10, 50, 100          01011xx

 * mcp4661  2   257     5, 10, 50, 100          0101xxx

 * mcp4662  2   257     5, 10, 50, 100          01011xx

 */

​

#include <linux/module.h>

#include <linux/i2c.h>

#include <linux/err.h>

#include <linux/of.h>

#include <linux/of_device.h>

​

#include <linux/iio/iio.h>

​

struct mcp4531_cfg {

    int wipers;

    int avail[3];

    int kohms;

};

​

enum mcp4531_type {

    MCP453x_502,

    MCP453x_103,

    MCP453x_503,

    MCP453x_104,

    MCP454x_502,

    MCP454x_103,

    MCP454x_503,

    MCP454x_104,

    MCP455x_502,

    MCP455x_103,

    MCP455x_503,

    MCP455x_104,

    MCP456x_502,

    MCP456x_103,

    MCP456x_503,

    MCP456x_104,

    MCP463x_502,

    MCP463x_103,

    MCP463x_503,

    MCP463x_104,

    MCP464x_502,