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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Nano River Technologies viperboard driver4 *5 * This is the core driver for the viperboard. There are cell drivers6 * available for I2C, ADC and both GPIOs. SPI is not yet supported.7 * The drivers do not support all features the board exposes. See user8 * manual of the viperboard.9 *10 * (C) 2012 by Lemonage GmbH11 * 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 28static const struct usb_device_id vprbrd_table[] = {29 { USB_DEVICE(0x2058, 0x1005) }, /* Nano River Technologies */30 { } /* Terminating entry */31};32 33MODULE_DEVICE_TABLE(usb, vprbrd_table);34 35static 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 47static 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(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(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,71 VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,72 VPRBRD_USB_TIMEOUT_MS);73 if (ret == 1)74 version = vb->buf[0];75 76 ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR,77 VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 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(&interface->dev, 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 98error:99 if (vb) {100 usb_put_dev(vb->usb_dev);101 kfree(vb);102 }103 104 return ret;105}106 107static 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 119static struct usb_driver vprbrd_driver = {120 .name = "viperboard",121 .probe = vprbrd_probe,122 .disconnect = vprbrd_disconnect,123 .id_table = vprbrd_table,124};125 126module_usb_driver(vprbrd_driver);127 128MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver");129MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");130MODULE_LICENSE("GPL");131