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 == 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_hotplug_devices(&interface->dev, vprbrd_devs,
97				      ARRAY_SIZE(vprbrd_devs));
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