LXR linux/drivers/mfd/viperboard.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Nano River Technologies viperboard driver
   4 *
   5 *  This is the core driver for the viperboard. There are cell drivers
   6 *  available for I2C, ADC and both GPIOs. SPI is not yet supported.
   7 *  The drivers do not support all features the board exposes. See user
   8 *  manual of the viperboard.
   9 *
  10 *  (C) 2012 by Lemonage GmbH
  11 *  Author: Lars Poeschel <poeschel@lemonage.de>
  12 *  All rights reserved.
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/errno.h>
  17#include <linux/module.h>
  18#include <linux/slab.h>
  19#include <linux/types.h>
  20#include <linux/mutex.h>
  21
  22#include <linux/mfd/core.h>
  23#include <linux/mfd/viperboard.h>
  24
  25#include <linux/usb.h>
  26
  27
  28static const struct usb_device_id vprbrd_table[] = {
  29        { USB_DEVICE(0x2058, 0x1005) },   /* Nano River Technologies */
  30        { }                               /* Terminating entry */
  31};
  32
  33MODULE_DEVICE_TABLE(usb, vprbrd_table);
  34
  35static const struct mfd_cell vprbrd_devs[] = {
  36        {
  37                .name = "viperboard-gpio",
  38        },
  39        {
  40                .name = "viperboard-i2c",
  41        },
  42        {
  43                .name = "viperboard-adc",
  44        },
  45};
  46
  47static int vprbrd_probe(struct usb_interface *interface,
  48                              const struct usb_device_id *id)
  49{
  50        struct vprbrd *vb;
  51
  52        u16 version = 0;
  53        int pipe, ret;
  54
  55        /* allocate memory for our device state and initialize it */
  56        vb = kzalloc(sizeof(*vb), GFP_KERNEL);
  57        if (!vb)
  58                return -ENOMEM;
  59
  60        mutex_init(&vb->lock);
  61
  62        vb->usb_dev = usb_get_dev(interface_to_usbdev(interface));
  63
  64        /* save our data pointer in this interface device */
  65        usb_set_intfdata(interface, vb);
  66        dev_set_drvdata(&vb->pdev.dev, vb);
  67
  68        /* get version information, major first, minor then */
  69        pipe = usb_rcvctrlpipe(vb->usb_dev, 0);
  70        ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR,
  71                VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
  72                VPRBRD_USB_TIMEOUT_MS);
  73        if (ret == 1)
  74                version = vb->buf[0];
  75
  76        ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR,
  77                VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
  78                VPRBRD_USB_TIMEOUT_MS);
  79        if (ret == 1) {
  80                version <<= 8;
  81                version = version | vb->buf[0];
  82        }
  83
  84        dev_info(&interface->dev,
  85                 "version %x.%02x found at bus %03d address %03d\n",
  86                 version >> 8, version & 0xff,
  87                 vb->usb_dev->bus->busnum, vb->usb_dev->devnum);
  88
  89        ret = mfd_add_hotplug_devices(&interface->dev, vprbrd_devs,
  90                                      ARRAY_SIZE(vprbrd_devs));
  91        if (ret != 0) {
  92                dev_err(&interface->dev, "Failed to add mfd devices to core.");
  93                goto error;
  94        }
  95
  96        return 0;
  97
  98error:
  99        if (vb) {
 100                usb_put_dev(vb->usb_dev);
 101                kfree(vb);
 102        }
 103
 104        return ret;
 105}
 106
 107static void vprbrd_disconnect(struct usb_interface *interface)
 108{
 109        struct vprbrd *vb = usb_get_intfdata(interface);
 110
 111        mfd_remove_devices(&interface->dev);
 112        usb_set_intfdata(interface, NULL);
 113        usb_put_dev(vb->usb_dev);
 114        kfree(vb);
 115
 116        dev_dbg(&interface->dev, "disconnected\n");
 117}
 118
 119static struct usb_driver vprbrd_driver = {
 120        .name           = "viperboard",
 121        .probe          = vprbrd_probe,
 122        .disconnect     = vprbrd_disconnect,
 123        .id_table       = vprbrd_table,
 124};
 125
 126module_usb_driver(vprbrd_driver);
 127
 128MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver");
 129MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
 130MODULE_LICENSE("GPL");
 131