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 | |
28 | static const struct usb_device_id vprbrd_table[] = { |
29 | { USB_DEVICE(0x2058, 0x1005) }, /* Nano River Technologies */ |
30 | { } /* Terminating entry */ |
31 | }; |
32 | |
33 | MODULE_DEVICE_TABLE(usb, vprbrd_table); |
34 | |
35 | static 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 | |
47 | static 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(size: 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(intf: interface, data: vb); |
66 | dev_set_drvdata(dev: &vb->pdev.dev, data: vb); |
67 | |
68 | /* get version information, major first, minor then */ |
69 | pipe = usb_rcvctrlpipe(vb->usb_dev, 0); |
70 | ret = usb_control_msg(dev: vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR, |
71 | VPRBRD_USB_TYPE_IN, value: 0x0000, index: 0x0000, data: vb->buf, size: 1, |
72 | VPRBRD_USB_TIMEOUT_MS); |
73 | if (ret == 1) |
74 | version = vb->buf[0]; |
75 | |
76 | ret = usb_control_msg(dev: vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR, |
77 | VPRBRD_USB_TYPE_IN, value: 0x0000, index: 0x0000, data: vb->buf, size: 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(parent: &interface->dev, cells: 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 | |
98 | error: |
99 | if (vb) { |
100 | usb_put_dev(dev: vb->usb_dev); |
101 | kfree(objp: vb); |
102 | } |
103 | |
104 | return ret; |
105 | } |
106 | |
107 | static void vprbrd_disconnect(struct usb_interface *interface) |
108 | { |
109 | struct vprbrd *vb = usb_get_intfdata(intf: interface); |
110 | |
111 | mfd_remove_devices(parent: &interface->dev); |
112 | usb_set_intfdata(intf: interface, NULL); |
113 | usb_put_dev(dev: vb->usb_dev); |
114 | kfree(objp: vb); |
115 | |
116 | dev_dbg(&interface->dev, "disconnected\n" ); |
117 | } |
118 | |
119 | static struct usb_driver vprbrd_driver = { |
120 | .name = "viperboard" , |
121 | .probe = vprbrd_probe, |
122 | .disconnect = vprbrd_disconnect, |
123 | .id_table = vprbrd_table, |
124 | }; |
125 | |
126 | module_usb_driver(vprbrd_driver); |
127 | |
128 | MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver" ); |
129 | MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>" ); |
130 | MODULE_LICENSE("GPL" ); |
131 | |