linux/drivers/mfd/viperboard.c
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   1/*
   2 *  Nano River Technologies viperboard driver
   3 *
   4 *  This is the core driver for the viperboard. There are cell drivers
   5 *  available for I2C, ADC and both GPIOs. SPI is not yet supported.
   6 *  The drivers do not support all features the board exposes. See user
   7 *  manual of the viperboard.
   8 *
   9 *  (C) 2012 by Lemonage GmbH
  10 *  Author: Lars Poeschel <poeschel@lemonage.de>
  11 *  All rights reserved.
  12 *
  13 *  This program is free software; you can redistribute  it and/or modify it
  14 *  under  the terms of  the GNU General  Public License as published by the
  15 *  Free Software Foundation;  either version 2 of the  License, or (at your
  16 *  option) any later version.
  17 *
  18 */
  19
  20#include <linux/kernel.h>
  21#include <linux/errno.h>
  22#include <linux/module.h>
  23#include <linux/slab.h>
  24#include <linux/types.h>
  25#include <linux/mutex.h>
  26
  27#include <linux/mfd/core.h>
  28#include <linux/mfd/viperboard.h>
  29
  30#include <linux/usb.h>
  31
  32
  33static const struct usb_device_id vprbrd_table[] = {
  34        { USB_DEVICE(0x2058, 0x1005) },   /* Nano River Technologies */
  35        { }                               /* Terminating entry */
  36};
  37
  38MODULE_DEVICE_TABLE(usb, vprbrd_table);
  39
  40static struct mfd_cell vprbrd_devs[] = {
  41        {
  42                .name = "viperboard-gpio",
  43        },
  44        {
  45                .name = "viperboard-i2c",
  46        },
  47        {
  48                .name = "viperboard-adc",
  49        },
  50};
  51
  52static int vprbrd_probe(struct usb_interface *interface,
  53                              const struct usb_device_id *id)
  54{
  55        struct vprbrd *vb;
  56
  57        u16 version = 0;
  58        int pipe, ret;
  59
  60        /* allocate memory for our device state and initialize it */
  61        vb = kzalloc(sizeof(*vb), GFP_KERNEL);
  62        if (vb == NULL) {
  63                dev_err(&interface->dev, "Out of memory\n");
  64                return -ENOMEM;
  65        }
  66
  67        mutex_init(&vb->lock);
  68
  69        vb->usb_dev = usb_get_dev(interface_to_usbdev(interface));
  70
  71        /* save our data pointer in this interface device */
  72        usb_set_intfdata(interface, vb);
  73        dev_set_drvdata(&vb->pdev.dev, vb);
  74
  75        /* get version information, major first, minor then */
  76        pipe = usb_rcvctrlpipe(vb->usb_dev, 0);
  77        ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR,
  78                VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
  79                VPRBRD_USB_TIMEOUT_MS);
  80        if (ret == 1)
  81                version = vb->buf[0];
  82
  83        ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR,
  84                VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
  85                VPRBRD_USB_TIMEOUT_MS);
  86        if (ret == 1) {
  87                version <<= 8;
  88                version = version | vb->buf[0];
  89        }
  90
  91        dev_info(&interface->dev,
  92                 "version %x.%02x found at bus %03d address %03d\n",
  93                 version >> 8, version & 0xff,
  94                 vb->usb_dev->bus->busnum, vb->usb_dev->devnum);
  95
  96        ret = mfd_add_devices(&interface->dev, -1, vprbrd_devs,
  97                                ARRAY_SIZE(vprbrd_devs), NULL, 0, NULL);
  98        if (ret != 0) {
  99                dev_err(&interface->dev, "Failed to add mfd devices to core.");
 100                goto error;
 101        }
 102
 103        return 0;
 104
 105error:
 106        if (vb) {
 107                usb_put_dev(vb->usb_dev);
 108                kfree(vb);
 109        }
 110
 111        return ret;
 112}
 113
 114static void vprbrd_disconnect(struct usb_interface *interface)
 115{
 116        struct vprbrd *vb = usb_get_intfdata(interface);
 117
 118        mfd_remove_devices(&interface->dev);
 119        usb_set_intfdata(interface, NULL);
 120        usb_put_dev(vb->usb_dev);
 121        kfree(vb);
 122
 123        dev_dbg(&interface->dev, "disconnected\n");
 124}
 125
 126static struct usb_driver vprbrd_driver = {
 127        .name           = "viperboard",
 128        .probe          = vprbrd_probe,
 129        .disconnect     = vprbrd_disconnect,
 130        .id_table       = vprbrd_table,
 131};
 132
 133module_usb_driver(vprbrd_driver);
 134
 135MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver");
 136MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
 137MODULE_LICENSE("GPL");
 138
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