LXR linux/drivers/mfd/viperboard.c

   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 const 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)
  63                return -ENOMEM;
  64
  65        mutex_init(&vb->lock);
  66
  67        vb->usb_dev = usb_get_dev(interface_to_usbdev(interface));
  68
  69        /* save our data pointer in this interface device */
  70        usb_set_intfdata(interface, vb);
  71        dev_set_drvdata(&vb->pdev.dev, vb);
  72
  73        /* get version information, major first, minor then */
  74        pipe = usb_rcvctrlpipe(vb->usb_dev, 0);
  75        ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR,
  76                VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
  77                VPRBRD_USB_TIMEOUT_MS);
  78        if (ret == 1)
  79                version = vb->buf[0];
  80
  81        ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR,
  82                VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
  83                VPRBRD_USB_TIMEOUT_MS);
  84        if (ret == 1) {
  85                version <<= 8;
  86                version = version | vb->buf[0];
  87        }
  88
  89        dev_info(&interface->dev,
  90                 "version %x.%02x found at bus %03d address %03d\n",
  91                 version >> 8, version & 0xff,
  92                 vb->usb_dev->bus->busnum, vb->usb_dev->devnum);
  93
  94        ret = mfd_add_hotplug_devices(&interface->dev, vprbrd_devs,
  95                                      ARRAY_SIZE(vprbrd_devs));
  96        if (ret != 0) {
  97                dev_err(&interface->dev, "Failed to add mfd devices to core.");
  98                goto error;
  99        }
 100
 101        return 0;
 102
 103error:
 104        if (vb) {
 105                usb_put_dev(vb->usb_dev);
 106                kfree(vb);
 107        }
 108
 109        return ret;
 110}
 111
 112static void vprbrd_disconnect(struct usb_interface *interface)
 113{
 114        struct vprbrd *vb = usb_get_intfdata(interface);
 115
 116        mfd_remove_devices(&interface->dev);
 117        usb_set_intfdata(interface, NULL);
 118        usb_put_dev(vb->usb_dev);
 119        kfree(vb);
 120
 121        dev_dbg(&interface->dev, "disconnected\n");
 122}
 123
 124static struct usb_driver vprbrd_driver = {
 125        .name           = "viperboard",
 126        .probe          = vprbrd_probe,
 127        .disconnect     = vprbrd_disconnect,
 128        .id_table       = vprbrd_table,
 129};
 130
 131module_usb_driver(vprbrd_driver);
 132
 133MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver");
 134MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
 135MODULE_LICENSE("GPL");
 136