136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/*
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* Nano River Technologies viperboard driver
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*
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* This is the core driver for the viperboard. There are cell drivers
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* available for I2C, ADC and both GPIOs. SPI is not yet supported.
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* The drivers do not support all features the board exposes. See user
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* manual of the viperboard.
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*
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* (C) 2012 by Lemonage GmbH
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* Author: Lars Poeschel <poeschel@lemonage.de>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/viperboard.h>
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#include <linux/usb.h>
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static const struct usb_device_id vprbrd_table[] = {
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{ USB_DEVICE(0x2058, 0x1005) }, /* Nano River Technologies */
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, vprbrd_table);
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static const struct mfd_cell vprbrd_devs[] = {
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{
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.name = "viperboard-gpio",
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},
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{
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.name = "viperboard-i2c",
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},
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{
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.name = "viperboard-adc",
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},
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};
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static int vprbrd_probe(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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struct vprbrd *vb;
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u16 version = 0;
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int pipe, ret;
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/* allocate memory for our device state and initialize it */
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vb = kzalloc(sizeof(*vb), GFP_KERNEL);
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if (!vb)
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return -ENOMEM;
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mutex_init(&vb->lock);
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vb->usb_dev = usb_get_dev(interface_to_usbdev(interface));
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/* save our data pointer in this interface device */
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usb_set_intfdata(interface, vb);
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dev_set_drvdata(&vb->pdev.dev, vb);
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/* get version information, major first, minor then */
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pipe = usb_rcvctrlpipe(vb->usb_dev, 0);
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ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR,
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VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
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VPRBRD_USB_TIMEOUT_MS);
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if (ret == 1)
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version = vb->buf[0];
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ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR,
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VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
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VPRBRD_USB_TIMEOUT_MS);
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if (ret == 1) {
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version <<= 8;
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version = version | vb->buf[0];
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}
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dev_info(&interface->dev,
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"version %x.%02x found at bus %03d address %03d\n",
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version >> 8, version & 0xff,
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vb->usb_dev->bus->busnum, vb->usb_dev->devnum);
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ret = mfd_add_hotplug_devices(&interface->dev, vprbrd_devs,
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ARRAY_SIZE(vprbrd_devs));
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if (ret != 0) {
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dev_err(&interface->dev, "Failed to add mfd devices to core.");
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goto error;
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}
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return 0;
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error:
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if (vb) {
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usb_put_dev(vb->usb_dev);
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kfree(vb);
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}
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return ret;
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}
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static void vprbrd_disconnect(struct usb_interface *interface)
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{
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struct vprbrd *vb = usb_get_intfdata(interface);
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mfd_remove_devices(&interface->dev);
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usb_set_intfdata(interface, NULL);
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usb_put_dev(vb->usb_dev);
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kfree(vb);
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dev_dbg(&interface->dev, "disconnected\n");
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}
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static struct usb_driver vprbrd_driver = {
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.name = "viperboard",
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.probe = vprbrd_probe,
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.disconnect = vprbrd_disconnect,
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.id_table = vprbrd_table,
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};
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module_usb_driver(vprbrd_driver);
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MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver");
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MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
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MODULE_LICENSE("GPL");
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