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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f01312d8 LP |
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. | |
f01312d8 LP |
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 | ||
5ac98553 | 35 | static const struct mfd_cell vprbrd_devs[] = { |
9d5b72de LP |
36 | { |
37 | .name = "viperboard-gpio", | |
38 | }, | |
174a13aa LP |
39 | { |
40 | .name = "viperboard-i2c", | |
41 | }, | |
ffd8a6e7 LP |
42 | { |
43 | .name = "viperboard-adc", | |
44 | }, | |
f01312d8 LP |
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; | |
f01312d8 LP |
54 | |
55 | /* allocate memory for our device state and initialize it */ | |
56 | vb = kzalloc(sizeof(*vb), GFP_KERNEL); | |
59f4d741 | 57 | if (!vb) |
f01312d8 | 58 | return -ENOMEM; |
f01312d8 LP |
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, | |
302b9562 | 71 | VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1, |
f01312d8 LP |
72 | VPRBRD_USB_TIMEOUT_MS); |
73 | if (ret == 1) | |
302b9562 | 74 | version = vb->buf[0]; |
f01312d8 LP |
75 | |
76 | ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR, | |
302b9562 | 77 | VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1, |
f01312d8 LP |
78 | VPRBRD_USB_TIMEOUT_MS); |
79 | if (ret == 1) { | |
80 | version <<= 8; | |
302b9562 | 81 | version = version | vb->buf[0]; |
f01312d8 LP |
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 | ||
1ab589c7 JH |
89 | ret = mfd_add_hotplug_devices(&interface->dev, vprbrd_devs, |
90 | ARRAY_SIZE(vprbrd_devs)); | |
f01312d8 LP |
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(vb->usb_dev); | |
101 | kfree(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(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 | ||
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"); |