531 lines
13 KiB
C
531 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for Meywa-Denki & KAYAC YUREX
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*
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* Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com)
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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/slab.h>
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#include <linux/module.h>
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#include <linux/kref.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/hid.h>
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#define DRIVER_AUTHOR "Tomoki Sekiyama"
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#define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX"
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#define YUREX_VENDOR_ID 0x0c45
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#define YUREX_PRODUCT_ID 0x1010
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#define CMD_ACK '!'
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#define CMD_ANIMATE 'A'
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#define CMD_COUNT 'C'
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#define CMD_LED 'L'
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#define CMD_READ 'R'
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#define CMD_SET 'S'
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#define CMD_VERSION 'V'
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#define CMD_EOF 0x0d
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#define CMD_PADDING 0xff
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#define YUREX_BUF_SIZE 8
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#define YUREX_WRITE_TIMEOUT (HZ*2)
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/* table of devices that work with this driver */
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static struct usb_device_id yurex_table[] = {
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{ USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, yurex_table);
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#ifdef CONFIG_USB_DYNAMIC_MINORS
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#define YUREX_MINOR_BASE 0
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#else
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#define YUREX_MINOR_BASE 192
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#endif
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/* Structure to hold all of our device specific stuff */
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struct usb_yurex {
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struct usb_device *udev;
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struct usb_interface *interface;
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__u8 int_in_endpointAddr;
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struct urb *urb; /* URB for interrupt in */
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unsigned char *int_buffer; /* buffer for intterupt in */
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struct urb *cntl_urb; /* URB for control msg */
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struct usb_ctrlrequest *cntl_req; /* req for control msg */
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unsigned char *cntl_buffer; /* buffer for control msg */
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struct kref kref;
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struct mutex io_mutex;
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unsigned long disconnected:1;
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struct fasync_struct *async_queue;
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wait_queue_head_t waitq;
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spinlock_t lock;
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__s64 bbu; /* BBU from device */
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};
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#define to_yurex_dev(d) container_of(d, struct usb_yurex, kref)
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static struct usb_driver yurex_driver;
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static const struct file_operations yurex_fops;
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static void yurex_control_callback(struct urb *urb)
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{
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struct usb_yurex *dev = urb->context;
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int status = urb->status;
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if (status) {
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dev_err(&urb->dev->dev, "%s - control failed: %d\n",
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__func__, status);
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wake_up_interruptible(&dev->waitq);
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return;
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}
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/* on success, sender woken up by CMD_ACK int in, or timeout */
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}
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static void yurex_delete(struct kref *kref)
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{
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struct usb_yurex *dev = to_yurex_dev(kref);
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dev_dbg(&dev->interface->dev, "%s\n", __func__);
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if (dev->cntl_urb) {
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usb_kill_urb(dev->cntl_urb);
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kfree(dev->cntl_req);
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usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
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dev->cntl_buffer, dev->cntl_urb->transfer_dma);
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usb_free_urb(dev->cntl_urb);
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}
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if (dev->urb) {
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usb_kill_urb(dev->urb);
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usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
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dev->int_buffer, dev->urb->transfer_dma);
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usb_free_urb(dev->urb);
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}
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usb_put_intf(dev->interface);
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usb_put_dev(dev->udev);
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kfree(dev);
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}
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/*
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* usb class driver info in order to get a minor number from the usb core,
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* and to have the device registered with the driver core
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*/
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static struct usb_class_driver yurex_class = {
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.name = "yurex%d",
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.fops = &yurex_fops,
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.minor_base = YUREX_MINOR_BASE,
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};
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static void yurex_interrupt(struct urb *urb)
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{
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struct usb_yurex *dev = urb->context;
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unsigned char *buf = dev->int_buffer;
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int status = urb->status;
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unsigned long flags;
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int retval, i;
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switch (status) {
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case 0: /*success*/
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break;
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/* The device is terminated or messed up, give up */
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case -EOVERFLOW:
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dev_err(&dev->interface->dev,
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"%s - overflow with length %d, actual length is %d\n",
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__func__, YUREX_BUF_SIZE, dev->urb->actual_length);
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return;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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case -EILSEQ:
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case -EPROTO:
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case -ETIME:
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return;
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default:
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dev_err(&dev->interface->dev,
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"%s - unknown status received: %d\n", __func__, status);
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return;
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}
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/* handle received message */
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switch (buf[0]) {
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case CMD_COUNT:
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case CMD_READ:
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if (buf[6] == CMD_EOF) {
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spin_lock_irqsave(&dev->lock, flags);
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dev->bbu = 0;
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for (i = 1; i < 6; i++) {
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dev->bbu += buf[i];
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if (i != 5)
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dev->bbu <<= 8;
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}
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dev_dbg(&dev->interface->dev, "%s count: %lld\n",
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__func__, dev->bbu);
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spin_unlock_irqrestore(&dev->lock, flags);
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kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
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}
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else
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dev_dbg(&dev->interface->dev,
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"data format error - no EOF\n");
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break;
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case CMD_ACK:
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dev_dbg(&dev->interface->dev, "%s ack: %c\n",
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__func__, buf[1]);
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wake_up_interruptible(&dev->waitq);
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break;
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}
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retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
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if (retval) {
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dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n",
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__func__, retval);
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}
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}
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static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id)
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{
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struct usb_yurex *dev;
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struct usb_host_interface *iface_desc;
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struct usb_endpoint_descriptor *endpoint;
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int retval = -ENOMEM;
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DEFINE_WAIT(wait);
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int res;
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/* allocate memory for our device state and initialize it */
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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goto error;
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kref_init(&dev->kref);
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mutex_init(&dev->io_mutex);
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spin_lock_init(&dev->lock);
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init_waitqueue_head(&dev->waitq);
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dev->udev = usb_get_dev(interface_to_usbdev(interface));
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dev->interface = usb_get_intf(interface);
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/* set up the endpoint information */
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iface_desc = interface->cur_altsetting;
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res = usb_find_int_in_endpoint(iface_desc, &endpoint);
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if (res) {
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dev_err(&interface->dev, "Could not find endpoints\n");
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retval = res;
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goto error;
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}
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dev->int_in_endpointAddr = endpoint->bEndpointAddress;
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/* allocate control URB */
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dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!dev->cntl_urb)
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goto error;
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/* allocate buffer for control req */
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dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL);
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if (!dev->cntl_req)
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goto error;
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/* allocate buffer for control msg */
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dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
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GFP_KERNEL,
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&dev->cntl_urb->transfer_dma);
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if (!dev->cntl_buffer) {
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dev_err(&interface->dev, "Could not allocate cntl_buffer\n");
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goto error;
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}
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/* configure control URB */
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dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS |
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USB_RECIP_INTERFACE;
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dev->cntl_req->bRequest = HID_REQ_SET_REPORT;
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dev->cntl_req->wValue = cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8);
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dev->cntl_req->wIndex = cpu_to_le16(iface_desc->desc.bInterfaceNumber);
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dev->cntl_req->wLength = cpu_to_le16(YUREX_BUF_SIZE);
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usb_fill_control_urb(dev->cntl_urb, dev->udev,
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usb_sndctrlpipe(dev->udev, 0),
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(void *)dev->cntl_req, dev->cntl_buffer,
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YUREX_BUF_SIZE, yurex_control_callback, dev);
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dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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/* allocate interrupt URB */
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dev->urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!dev->urb)
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goto error;
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/* allocate buffer for interrupt in */
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dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
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GFP_KERNEL, &dev->urb->transfer_dma);
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if (!dev->int_buffer) {
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dev_err(&interface->dev, "Could not allocate int_buffer\n");
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goto error;
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}
|
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|
||
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/* configure interrupt URB */
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usb_fill_int_urb(dev->urb, dev->udev,
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usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr),
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dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
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dev, 1);
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dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
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retval = -EIO;
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dev_err(&interface->dev, "Could not submitting URB\n");
|
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goto error;
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}
|
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|
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|
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/* save our data pointer in this interface device */
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usb_set_intfdata(interface, dev);
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dev->bbu = -1;
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/* we can register the device now, as it is ready */
|
||
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retval = usb_register_dev(interface, &yurex_class);
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if (retval) {
|
||
|
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dev_err(&interface->dev,
|
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|
|
"Not able to get a minor for this device.\n");
|
||
|
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usb_set_intfdata(interface, NULL);
|
||
|
|
goto error;
|
||
|
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}
|
||
|
|
|
||
|
|
dev_info(&interface->dev,
|
||
|
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"USB YUREX device now attached to Yurex #%d\n",
|
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|
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interface->minor);
|
||
|
|
|
||
|
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return 0;
|
||
|
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|
||
|
|
error:
|
||
|
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if (dev)
|
||
|
|
/* this frees allocated memory */
|
||
|
|
kref_put(&dev->kref, yurex_delete);
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void yurex_disconnect(struct usb_interface *interface)
|
||
|
|
{
|
||
|
|
struct usb_yurex *dev;
|
||
|
|
int minor = interface->minor;
|
||
|
|
|
||
|
|
dev = usb_get_intfdata(interface);
|
||
|
|
usb_set_intfdata(interface, NULL);
|
||
|
|
|
||
|
|
/* give back our minor */
|
||
|
|
usb_deregister_dev(interface, &yurex_class);
|
||
|
|
|
||
|
|
/* prevent more I/O from starting */
|
||
|
|
usb_poison_urb(dev->urb);
|
||
|
|
usb_poison_urb(dev->cntl_urb);
|
||
|
|
mutex_lock(&dev->io_mutex);
|
||
|
|
dev->disconnected = 1;
|
||
|
|
mutex_unlock(&dev->io_mutex);
|
||
|
|
|
||
|
|
/* wakeup waiters */
|
||
|
|
kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
|
||
|
|
wake_up_interruptible(&dev->waitq);
|
||
|
|
|
||
|
|
/* decrement our usage count */
|
||
|
|
kref_put(&dev->kref, yurex_delete);
|
||
|
|
|
||
|
|
dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct usb_driver yurex_driver = {
|
||
|
|
.name = "yurex",
|
||
|
|
.probe = yurex_probe,
|
||
|
|
.disconnect = yurex_disconnect,
|
||
|
|
.id_table = yurex_table,
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
static int yurex_fasync(int fd, struct file *file, int on)
|
||
|
|
{
|
||
|
|
struct usb_yurex *dev;
|
||
|
|
|
||
|
|
dev = file->private_data;
|
||
|
|
return fasync_helper(fd, file, on, &dev->async_queue);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int yurex_open(struct inode *inode, struct file *file)
|
||
|
|
{
|
||
|
|
struct usb_yurex *dev;
|
||
|
|
struct usb_interface *interface;
|
||
|
|
int subminor;
|
||
|
|
int retval = 0;
|
||
|
|
|
||
|
|
subminor = iminor(inode);
|
||
|
|
|
||
|
|
interface = usb_find_interface(&yurex_driver, subminor);
|
||
|
|
if (!interface) {
|
||
|
|
printk(KERN_ERR "%s - error, can't find device for minor %d",
|
||
|
|
__func__, subminor);
|
||
|
|
retval = -ENODEV;
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
dev = usb_get_intfdata(interface);
|
||
|
|
if (!dev) {
|
||
|
|
retval = -ENODEV;
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* increment our usage count for the device */
|
||
|
|
kref_get(&dev->kref);
|
||
|
|
|
||
|
|
/* save our object in the file's private structure */
|
||
|
|
mutex_lock(&dev->io_mutex);
|
||
|
|
file->private_data = dev;
|
||
|
|
mutex_unlock(&dev->io_mutex);
|
||
|
|
|
||
|
|
exit:
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int yurex_release(struct inode *inode, struct file *file)
|
||
|
|
{
|
||
|
|
struct usb_yurex *dev;
|
||
|
|
|
||
|
|
dev = file->private_data;
|
||
|
|
if (dev == NULL)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
/* decrement the count on our device */
|
||
|
|
kref_put(&dev->kref, yurex_delete);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t yurex_read(struct file *file, char __user *buffer, size_t count,
|
||
|
|
loff_t *ppos)
|
||
|
|
{
|
||
|
|
struct usb_yurex *dev;
|
||
|
|
int len = 0;
|
||
|
|
char in_buffer[20];
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
dev = file->private_data;
|
||
|
|
|
||
|
|
mutex_lock(&dev->io_mutex);
|
||
|
|
if (dev->disconnected) { /* already disconnected */
|
||
|
|
mutex_unlock(&dev->io_mutex);
|
||
|
|
return -ENODEV;
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_lock_irqsave(&dev->lock, flags);
|
||
|
|
len = snprintf(in_buffer, 20, "%lld\n", dev->bbu);
|
||
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
||
|
|
mutex_unlock(&dev->io_mutex);
|
||
|
|
|
||
|
|
if (WARN_ON_ONCE(len >= sizeof(in_buffer)))
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
return simple_read_from_buffer(buffer, count, ppos, in_buffer, len);
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t yurex_write(struct file *file, const char __user *user_buffer,
|
||
|
|
size_t count, loff_t *ppos)
|
||
|
|
{
|
||
|
|
struct usb_yurex *dev;
|
||
|
|
int i, set = 0, retval = 0;
|
||
|
|
char buffer[16 + 1];
|
||
|
|
char *data = buffer;
|
||
|
|
unsigned long long c, c2 = 0;
|
||
|
|
signed long timeout = 0;
|
||
|
|
DEFINE_WAIT(wait);
|
||
|
|
|
||
|
|
count = min(sizeof(buffer) - 1, count);
|
||
|
|
dev = file->private_data;
|
||
|
|
|
||
|
|
/* verify that we actually have some data to write */
|
||
|
|
if (count == 0)
|
||
|
|
goto error;
|
||
|
|
|
||
|
|
mutex_lock(&dev->io_mutex);
|
||
|
|
if (dev->disconnected) { /* already disconnected */
|
||
|
|
mutex_unlock(&dev->io_mutex);
|
||
|
|
retval = -ENODEV;
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (copy_from_user(buffer, user_buffer, count)) {
|
||
|
|
mutex_unlock(&dev->io_mutex);
|
||
|
|
retval = -EFAULT;
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
buffer[count] = 0;
|
||
|
|
memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE);
|
||
|
|
|
||
|
|
switch (buffer[0]) {
|
||
|
|
case CMD_ANIMATE:
|
||
|
|
case CMD_LED:
|
||
|
|
dev->cntl_buffer[0] = buffer[0];
|
||
|
|
dev->cntl_buffer[1] = buffer[1];
|
||
|
|
dev->cntl_buffer[2] = CMD_EOF;
|
||
|
|
break;
|
||
|
|
case CMD_READ:
|
||
|
|
case CMD_VERSION:
|
||
|
|
dev->cntl_buffer[0] = buffer[0];
|
||
|
|
dev->cntl_buffer[1] = 0x00;
|
||
|
|
dev->cntl_buffer[2] = CMD_EOF;
|
||
|
|
break;
|
||
|
|
case CMD_SET:
|
||
|
|
data++;
|
||
|
|
fallthrough;
|
||
|
|
case '0' ... '9':
|
||
|
|
set = 1;
|
||
|
|
c = c2 = simple_strtoull(data, NULL, 0);
|
||
|
|
dev->cntl_buffer[0] = CMD_SET;
|
||
|
|
for (i = 1; i < 6; i++) {
|
||
|
|
dev->cntl_buffer[i] = (c>>32) & 0xff;
|
||
|
|
c <<= 8;
|
||
|
|
}
|
||
|
|
buffer[6] = CMD_EOF;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
mutex_unlock(&dev->io_mutex);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* send the data as the control msg */
|
||
|
|
prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE);
|
||
|
|
dev_dbg(&dev->interface->dev, "%s - submit %c\n", __func__,
|
||
|
|
dev->cntl_buffer[0]);
|
||
|
|
retval = usb_submit_urb(dev->cntl_urb, GFP_ATOMIC);
|
||
|
|
if (retval >= 0)
|
||
|
|
timeout = schedule_timeout(YUREX_WRITE_TIMEOUT);
|
||
|
|
finish_wait(&dev->waitq, &wait);
|
||
|
|
|
||
|
|
/* make sure URB is idle after timeout or (spurious) CMD_ACK */
|
||
|
|
usb_kill_urb(dev->cntl_urb);
|
||
|
|
|
||
|
|
mutex_unlock(&dev->io_mutex);
|
||
|
|
|
||
|
|
if (retval < 0) {
|
||
|
|
dev_err(&dev->interface->dev,
|
||
|
|
"%s - failed to send bulk msg, error %d\n",
|
||
|
|
__func__, retval);
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
if (set && timeout)
|
||
|
|
dev->bbu = c2;
|
||
|
|
return timeout ? count : -EIO;
|
||
|
|
|
||
|
|
error:
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct file_operations yurex_fops = {
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.read = yurex_read,
|
||
|
|
.write = yurex_write,
|
||
|
|
.open = yurex_open,
|
||
|
|
.release = yurex_release,
|
||
|
|
.fasync = yurex_fasync,
|
||
|
|
.llseek = default_llseek,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_usb_driver(yurex_driver);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|