1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Nano River Technologies viperboard driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * This is the core driver for the viperboard. There are cell drivers
6*4882a593Smuzhiyun * available for I2C, ADC and both GPIOs. SPI is not yet supported.
7*4882a593Smuzhiyun * The drivers do not support all features the board exposes. See user
8*4882a593Smuzhiyun * manual of the viperboard.
9*4882a593Smuzhiyun *
10*4882a593Smuzhiyun * (C) 2012 by Lemonage GmbH
11*4882a593Smuzhiyun * Author: Lars Poeschel <poeschel@lemonage.de>
12*4882a593Smuzhiyun * All rights reserved.
13*4882a593Smuzhiyun */
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #include <linux/kernel.h>
16*4882a593Smuzhiyun #include <linux/errno.h>
17*4882a593Smuzhiyun #include <linux/module.h>
18*4882a593Smuzhiyun #include <linux/slab.h>
19*4882a593Smuzhiyun #include <linux/types.h>
20*4882a593Smuzhiyun #include <linux/mutex.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #include <linux/mfd/core.h>
23*4882a593Smuzhiyun #include <linux/mfd/viperboard.h>
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun #include <linux/usb.h>
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun static const struct usb_device_id vprbrd_table[] = {
29*4882a593Smuzhiyun { USB_DEVICE(0x2058, 0x1005) }, /* Nano River Technologies */
30*4882a593Smuzhiyun { } /* Terminating entry */
31*4882a593Smuzhiyun };
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun MODULE_DEVICE_TABLE(usb, vprbrd_table);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun static const struct mfd_cell vprbrd_devs[] = {
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun .name = "viperboard-gpio",
38*4882a593Smuzhiyun },
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun .name = "viperboard-i2c",
41*4882a593Smuzhiyun },
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun .name = "viperboard-adc",
44*4882a593Smuzhiyun },
45*4882a593Smuzhiyun };
46*4882a593Smuzhiyun
vprbrd_probe(struct usb_interface * interface,const struct usb_device_id * id)47*4882a593Smuzhiyun static int vprbrd_probe(struct usb_interface *interface,
48*4882a593Smuzhiyun const struct usb_device_id *id)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun struct vprbrd *vb;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun u16 version = 0;
53*4882a593Smuzhiyun int pipe, ret;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun /* allocate memory for our device state and initialize it */
56*4882a593Smuzhiyun vb = kzalloc(sizeof(*vb), GFP_KERNEL);
57*4882a593Smuzhiyun if (!vb)
58*4882a593Smuzhiyun return -ENOMEM;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun mutex_init(&vb->lock);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun vb->usb_dev = usb_get_dev(interface_to_usbdev(interface));
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun /* save our data pointer in this interface device */
65*4882a593Smuzhiyun usb_set_intfdata(interface, vb);
66*4882a593Smuzhiyun dev_set_drvdata(&vb->pdev.dev, vb);
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun /* get version information, major first, minor then */
69*4882a593Smuzhiyun pipe = usb_rcvctrlpipe(vb->usb_dev, 0);
70*4882a593Smuzhiyun ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR,
71*4882a593Smuzhiyun VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
72*4882a593Smuzhiyun VPRBRD_USB_TIMEOUT_MS);
73*4882a593Smuzhiyun if (ret == 1)
74*4882a593Smuzhiyun version = vb->buf[0];
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR,
77*4882a593Smuzhiyun VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
78*4882a593Smuzhiyun VPRBRD_USB_TIMEOUT_MS);
79*4882a593Smuzhiyun if (ret == 1) {
80*4882a593Smuzhiyun version <<= 8;
81*4882a593Smuzhiyun version = version | vb->buf[0];
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun dev_info(&interface->dev,
85*4882a593Smuzhiyun "version %x.%02x found at bus %03d address %03d\n",
86*4882a593Smuzhiyun version >> 8, version & 0xff,
87*4882a593Smuzhiyun vb->usb_dev->bus->busnum, vb->usb_dev->devnum);
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun ret = mfd_add_hotplug_devices(&interface->dev, vprbrd_devs,
90*4882a593Smuzhiyun ARRAY_SIZE(vprbrd_devs));
91*4882a593Smuzhiyun if (ret != 0) {
92*4882a593Smuzhiyun dev_err(&interface->dev, "Failed to add mfd devices to core.");
93*4882a593Smuzhiyun goto error;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun return 0;
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun error:
99*4882a593Smuzhiyun if (vb) {
100*4882a593Smuzhiyun usb_put_dev(vb->usb_dev);
101*4882a593Smuzhiyun kfree(vb);
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun return ret;
105*4882a593Smuzhiyun }
106*4882a593Smuzhiyun
vprbrd_disconnect(struct usb_interface * interface)107*4882a593Smuzhiyun static void vprbrd_disconnect(struct usb_interface *interface)
108*4882a593Smuzhiyun {
109*4882a593Smuzhiyun struct vprbrd *vb = usb_get_intfdata(interface);
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun mfd_remove_devices(&interface->dev);
112*4882a593Smuzhiyun usb_set_intfdata(interface, NULL);
113*4882a593Smuzhiyun usb_put_dev(vb->usb_dev);
114*4882a593Smuzhiyun kfree(vb);
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun dev_dbg(&interface->dev, "disconnected\n");
117*4882a593Smuzhiyun }
118*4882a593Smuzhiyun
119*4882a593Smuzhiyun static struct usb_driver vprbrd_driver = {
120*4882a593Smuzhiyun .name = "viperboard",
121*4882a593Smuzhiyun .probe = vprbrd_probe,
122*4882a593Smuzhiyun .disconnect = vprbrd_disconnect,
123*4882a593Smuzhiyun .id_table = vprbrd_table,
124*4882a593Smuzhiyun };
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun module_usb_driver(vprbrd_driver);
127*4882a593Smuzhiyun
128*4882a593Smuzhiyun MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver");
129*4882a593Smuzhiyun MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
130*4882a593Smuzhiyun MODULE_LICENSE("GPL");
131