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/*
* Nano River Technologies viperboard driver
*
* This is the core driver for the viperboard. There are cell drivers
* available for I2C, ADC and both GPIOs. SPI is not yet supported.
* The drivers do not support all features the board exposes. See user
* manual of the viperboard.
*
* (C) 2012 by Lemonage GmbH
* Author: Lars Poeschel <poeschel@lemonage.de>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/mfd/viperboard.h>
#include <linux/usb.h>
static const struct usb_device_id vprbrd_table[] = {
{ USB_DEVICE(0x2058, 0x1005) }, /* Nano River Technologies */
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, vprbrd_table);
static const struct mfd_cell vprbrd_devs[] = {
{
.name = "viperboard-gpio",
},
{
.name = "viperboard-i2c",
},
{
.name = "viperboard-adc",
},
};
static int vprbrd_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct vprbrd *vb;
u16 version = 0;
int pipe, ret;
/* allocate memory for our device state and initialize it */
vb = kzalloc(sizeof(*vb), GFP_KERNEL);
if (vb == NULL) {
dev_err(&interface->dev, "Out of memory\n");
return -ENOMEM;
}
mutex_init(&vb->lock);
vb->usb_dev = usb_get_dev(interface_to_usbdev(interface));
/* save our data pointer in this interface device */
usb_set_intfdata(interface, vb);
dev_set_drvdata(&vb->pdev.dev, vb);
/* get version information, major first, minor then */
pipe = usb_rcvctrlpipe(vb->usb_dev, 0);
ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR,
VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
VPRBRD_USB_TIMEOUT_MS);
if (ret == 1)
version = vb->buf[0];
ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR,
VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
VPRBRD_USB_TIMEOUT_MS);
if (ret == 1) {
version <<= 8;
version = version | vb->buf[0];
}
dev_info(&interface->dev,
"version %x.%02x found at bus %03d address %03d\n",
version >> 8, version & 0xff,
vb->usb_dev->bus->busnum, vb->usb_dev->devnum);
ret = mfd_add_hotplug_devices(&interface->dev, vprbrd_devs,
ARRAY_SIZE(vprbrd_devs));
if (ret != 0) {
dev_err(&interface->dev, "Failed to add mfd devices to core.");
goto error;
}
return 0;
error:
if (vb) {
usb_put_dev(vb->usb_dev);
kfree(vb);
}
return ret;
}
static void vprbrd_disconnect(struct usb_interface *interface)
{
struct vprbrd *vb = usb_get_intfdata(interface);
mfd_remove_devices(&interface->dev);
usb_set_intfdata(interface, NULL);
usb_put_dev(vb->usb_dev);
kfree(vb);
dev_dbg(&interface->dev, "disconnected\n");
}
static struct usb_driver vprbrd_driver = {
.name = "viperboard",
.probe = vprbrd_probe,
.disconnect = vprbrd_disconnect,
.id_table = vprbrd_table,
};
module_usb_driver(vprbrd_driver);
MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver");
MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
MODULE_LICENSE("GPL");
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