12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2f01312d8SLars Poeschel /*
3f01312d8SLars Poeschel * Nano River Technologies viperboard driver
4f01312d8SLars Poeschel *
5f01312d8SLars Poeschel * This is the core driver for the viperboard. There are cell drivers
6f01312d8SLars Poeschel * available for I2C, ADC and both GPIOs. SPI is not yet supported.
7f01312d8SLars Poeschel * The drivers do not support all features the board exposes. See user
8f01312d8SLars Poeschel * manual of the viperboard.
9f01312d8SLars Poeschel *
10f01312d8SLars Poeschel * (C) 2012 by Lemonage GmbH
11f01312d8SLars Poeschel * Author: Lars Poeschel <poeschel@lemonage.de>
12f01312d8SLars Poeschel * All rights reserved.
13f01312d8SLars Poeschel */
14f01312d8SLars Poeschel
15f01312d8SLars Poeschel #include <linux/kernel.h>
16f01312d8SLars Poeschel #include <linux/errno.h>
17f01312d8SLars Poeschel #include <linux/module.h>
18f01312d8SLars Poeschel #include <linux/slab.h>
19f01312d8SLars Poeschel #include <linux/types.h>
20f01312d8SLars Poeschel #include <linux/mutex.h>
21f01312d8SLars Poeschel
22f01312d8SLars Poeschel #include <linux/mfd/core.h>
23f01312d8SLars Poeschel #include <linux/mfd/viperboard.h>
24f01312d8SLars Poeschel
25f01312d8SLars Poeschel #include <linux/usb.h>
26f01312d8SLars Poeschel
27f01312d8SLars Poeschel
28f01312d8SLars Poeschel static const struct usb_device_id vprbrd_table[] = {
29f01312d8SLars Poeschel { USB_DEVICE(0x2058, 0x1005) }, /* Nano River Technologies */
30f01312d8SLars Poeschel { } /* Terminating entry */
31f01312d8SLars Poeschel };
32f01312d8SLars Poeschel
33f01312d8SLars Poeschel MODULE_DEVICE_TABLE(usb, vprbrd_table);
34f01312d8SLars Poeschel
355ac98553SGeert Uytterhoeven static const struct mfd_cell vprbrd_devs[] = {
369d5b72deSLars Poeschel {
379d5b72deSLars Poeschel .name = "viperboard-gpio",
389d5b72deSLars Poeschel },
39174a13aaSLars Poeschel {
40174a13aaSLars Poeschel .name = "viperboard-i2c",
41174a13aaSLars Poeschel },
42ffd8a6e7SLars Poeschel {
43ffd8a6e7SLars Poeschel .name = "viperboard-adc",
44ffd8a6e7SLars Poeschel },
45f01312d8SLars Poeschel };
46f01312d8SLars Poeschel
vprbrd_probe(struct usb_interface * interface,const struct usb_device_id * id)47f01312d8SLars Poeschel static int vprbrd_probe(struct usb_interface *interface,
48f01312d8SLars Poeschel const struct usb_device_id *id)
49f01312d8SLars Poeschel {
50f01312d8SLars Poeschel struct vprbrd *vb;
51f01312d8SLars Poeschel
52f01312d8SLars Poeschel u16 version = 0;
53f01312d8SLars Poeschel int pipe, ret;
54f01312d8SLars Poeschel
55f01312d8SLars Poeschel /* allocate memory for our device state and initialize it */
56f01312d8SLars Poeschel vb = kzalloc(sizeof(*vb), GFP_KERNEL);
5759f4d741SMarkus Elfring if (!vb)
58f01312d8SLars Poeschel return -ENOMEM;
59f01312d8SLars Poeschel
60f01312d8SLars Poeschel mutex_init(&vb->lock);
61f01312d8SLars Poeschel
62f01312d8SLars Poeschel vb->usb_dev = usb_get_dev(interface_to_usbdev(interface));
63f01312d8SLars Poeschel
64f01312d8SLars Poeschel /* save our data pointer in this interface device */
65f01312d8SLars Poeschel usb_set_intfdata(interface, vb);
66f01312d8SLars Poeschel dev_set_drvdata(&vb->pdev.dev, vb);
67f01312d8SLars Poeschel
68f01312d8SLars Poeschel /* get version information, major first, minor then */
69f01312d8SLars Poeschel pipe = usb_rcvctrlpipe(vb->usb_dev, 0);
70f01312d8SLars Poeschel ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR,
71302b9562SLars Poeschel VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
72f01312d8SLars Poeschel VPRBRD_USB_TIMEOUT_MS);
73f01312d8SLars Poeschel if (ret == 1)
74302b9562SLars Poeschel version = vb->buf[0];
75f01312d8SLars Poeschel
76f01312d8SLars Poeschel ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR,
77302b9562SLars Poeschel VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
78f01312d8SLars Poeschel VPRBRD_USB_TIMEOUT_MS);
79f01312d8SLars Poeschel if (ret == 1) {
80f01312d8SLars Poeschel version <<= 8;
81302b9562SLars Poeschel version = version | vb->buf[0];
82f01312d8SLars Poeschel }
83f01312d8SLars Poeschel
84f01312d8SLars Poeschel dev_info(&interface->dev,
85f01312d8SLars Poeschel "version %x.%02x found at bus %03d address %03d\n",
86f01312d8SLars Poeschel version >> 8, version & 0xff,
87f01312d8SLars Poeschel vb->usb_dev->bus->busnum, vb->usb_dev->devnum);
88f01312d8SLars Poeschel
891ab589c7SJohan Hovold ret = mfd_add_hotplug_devices(&interface->dev, vprbrd_devs,
901ab589c7SJohan Hovold ARRAY_SIZE(vprbrd_devs));
91f01312d8SLars Poeschel if (ret != 0) {
92f01312d8SLars Poeschel dev_err(&interface->dev, "Failed to add mfd devices to core.");
93f01312d8SLars Poeschel goto error;
94f01312d8SLars Poeschel }
95f01312d8SLars Poeschel
96f01312d8SLars Poeschel return 0;
97f01312d8SLars Poeschel
98f01312d8SLars Poeschel error:
99f01312d8SLars Poeschel if (vb) {
100f01312d8SLars Poeschel usb_put_dev(vb->usb_dev);
101f01312d8SLars Poeschel kfree(vb);
102f01312d8SLars Poeschel }
103f01312d8SLars Poeschel
104f01312d8SLars Poeschel return ret;
105f01312d8SLars Poeschel }
106f01312d8SLars Poeschel
vprbrd_disconnect(struct usb_interface * interface)107f01312d8SLars Poeschel static void vprbrd_disconnect(struct usb_interface *interface)
108f01312d8SLars Poeschel {
109f01312d8SLars Poeschel struct vprbrd *vb = usb_get_intfdata(interface);
110f01312d8SLars Poeschel
111f01312d8SLars Poeschel mfd_remove_devices(&interface->dev);
112f01312d8SLars Poeschel usb_set_intfdata(interface, NULL);
113f01312d8SLars Poeschel usb_put_dev(vb->usb_dev);
114f01312d8SLars Poeschel kfree(vb);
115f01312d8SLars Poeschel
116f01312d8SLars Poeschel dev_dbg(&interface->dev, "disconnected\n");
117f01312d8SLars Poeschel }
118f01312d8SLars Poeschel
119f01312d8SLars Poeschel static struct usb_driver vprbrd_driver = {
120f01312d8SLars Poeschel .name = "viperboard",
121f01312d8SLars Poeschel .probe = vprbrd_probe,
122f01312d8SLars Poeschel .disconnect = vprbrd_disconnect,
123f01312d8SLars Poeschel .id_table = vprbrd_table,
124f01312d8SLars Poeschel };
125f01312d8SLars Poeschel
126f01312d8SLars Poeschel module_usb_driver(vprbrd_driver);
127f01312d8SLars Poeschel
128f01312d8SLars Poeschel MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver");
129f01312d8SLars Poeschel MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
130f01312d8SLars Poeschel MODULE_LICENSE("GPL");
131