1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*
* 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_devices(&interface->dev, PLATFORM_DEVID_AUTO,
vprbrd_devs, ARRAY_SIZE(vprbrd_devs), NULL, 0,
NULL);
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");
|
