| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Driver for Meywa-Denki & KAYAC YUREX |
| * |
| * Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com) |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/kref.h> |
| #include <linux/mutex.h> |
| #include <linux/uaccess.h> |
| #include <linux/usb.h> |
| #include <linux/hid.h> |
| |
| #define DRIVER_AUTHOR "Tomoki Sekiyama" |
| #define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX" |
| |
| #define YUREX_VENDOR_ID 0x0c45 |
| #define YUREX_PRODUCT_ID 0x1010 |
| |
| #define CMD_ACK '!' |
| #define CMD_ANIMATE 'A' |
| #define CMD_COUNT 'C' |
| #define CMD_LED 'L' |
| #define CMD_READ 'R' |
| #define CMD_SET 'S' |
| #define CMD_VERSION 'V' |
| #define CMD_EOF 0x0d |
| #define CMD_PADDING 0xff |
| |
| #define YUREX_BUF_SIZE 8 |
| #define YUREX_WRITE_TIMEOUT (HZ*2) |
| |
| /* table of devices that work with this driver */ |
| static struct usb_device_id yurex_table[] = { |
| { USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) }, |
| { } /* Terminating entry */ |
| }; |
| MODULE_DEVICE_TABLE(usb, yurex_table); |
| |
| #ifdef CONFIG_USB_DYNAMIC_MINORS |
| #define YUREX_MINOR_BASE 0 |
| #else |
| #define YUREX_MINOR_BASE 192 |
| #endif |
| |
| /* Structure to hold all of our device specific stuff */ |
| struct usb_yurex { |
| struct usb_device *udev; |
| struct usb_interface *interface; |
| __u8 int_in_endpointAddr; |
| struct urb *urb; /* URB for interrupt in */ |
| unsigned char *int_buffer; /* buffer for intterupt in */ |
| struct urb *cntl_urb; /* URB for control msg */ |
| struct usb_ctrlrequest *cntl_req; /* req for control msg */ |
| unsigned char *cntl_buffer; /* buffer for control msg */ |
| |
| struct kref kref; |
| struct mutex io_mutex; |
| struct fasync_struct *async_queue; |
| wait_queue_head_t waitq; |
| |
| spinlock_t lock; |
| __s64 bbu; /* BBU from device */ |
| }; |
| #define to_yurex_dev(d) container_of(d, struct usb_yurex, kref) |
| |
| static struct usb_driver yurex_driver; |
| static const struct file_operations yurex_fops; |
| |
| |
| static void yurex_control_callback(struct urb *urb) |
| { |
| struct usb_yurex *dev = urb->context; |
| int status = urb->status; |
| |
| if (status) { |
| dev_err(&urb->dev->dev, "%s - control failed: %d\n", |
| __func__, status); |
| wake_up_interruptible(&dev->waitq); |
| return; |
| } |
| /* on success, sender woken up by CMD_ACK int in, or timeout */ |
| } |
| |
| static void yurex_delete(struct kref *kref) |
| { |
| struct usb_yurex *dev = to_yurex_dev(kref); |
| |
| dev_dbg(&dev->interface->dev, "%s\n", __func__); |
| |
| usb_put_dev(dev->udev); |
| if (dev->cntl_urb) { |
| usb_kill_urb(dev->cntl_urb); |
| kfree(dev->cntl_req); |
| if (dev->cntl_buffer) |
| usb_free_coherent(dev->udev, YUREX_BUF_SIZE, |
| dev->cntl_buffer, dev->cntl_urb->transfer_dma); |
| usb_free_urb(dev->cntl_urb); |
| } |
| if (dev->urb) { |
| usb_kill_urb(dev->urb); |
| if (dev->int_buffer) |
| usb_free_coherent(dev->udev, YUREX_BUF_SIZE, |
| dev->int_buffer, dev->urb->transfer_dma); |
| usb_free_urb(dev->urb); |
| } |
| kfree(dev); |
| } |
| |
| /* |
| * usb class driver info in order to get a minor number from the usb core, |
| * and to have the device registered with the driver core |
| */ |
| static struct usb_class_driver yurex_class = { |
| .name = "yurex%d", |
| .fops = &yurex_fops, |
| .minor_base = YUREX_MINOR_BASE, |
| }; |
| |
| static void yurex_interrupt(struct urb *urb) |
| { |
| struct usb_yurex *dev = urb->context; |
| unsigned char *buf = dev->int_buffer; |
| int status = urb->status; |
| unsigned long flags; |
| int retval, i; |
| |
| switch (status) { |
| case 0: /*success*/ |
| break; |
| case -EOVERFLOW: |
| dev_err(&dev->interface->dev, |
| "%s - overflow with length %d, actual length is %d\n", |
| __func__, YUREX_BUF_SIZE, dev->urb->actual_length); |
| case -ECONNRESET: |
| case -ENOENT: |
| case -ESHUTDOWN: |
| case -EILSEQ: |
| /* The device is terminated, clean up */ |
| return; |
| default: |
| dev_err(&dev->interface->dev, |
| "%s - unknown status received: %d\n", __func__, status); |
| goto exit; |
| } |
| |
| /* handle received message */ |
| switch (buf[0]) { |
| case CMD_COUNT: |
| case CMD_READ: |
| if (buf[6] == CMD_EOF) { |
| spin_lock_irqsave(&dev->lock, flags); |
| dev->bbu = 0; |
| for (i = 1; i < 6; i++) { |
| dev->bbu += buf[i]; |
| if (i != 5) |
| dev->bbu <<= 8; |
| } |
| dev_dbg(&dev->interface->dev, "%s count: %lld\n", |
| __func__, dev->bbu); |
| spin_unlock_irqrestore(&dev->lock, flags); |
| |
| kill_fasync(&dev->async_queue, SIGIO, POLL_IN); |
| } |
| else |
| dev_dbg(&dev->interface->dev, |
| "data format error - no EOF\n"); |
| break; |
| case CMD_ACK: |
| dev_dbg(&dev->interface->dev, "%s ack: %c\n", |
| __func__, buf[1]); |
| wake_up_interruptible(&dev->waitq); |
| break; |
| } |
| |
| exit: |
| retval = usb_submit_urb(dev->urb, GFP_ATOMIC); |
| if (retval) { |
| dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n", |
| __func__, retval); |
| } |
| } |
| |
| static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id) |
| { |
| struct usb_yurex *dev; |
| struct usb_host_interface *iface_desc; |
| struct usb_endpoint_descriptor *endpoint; |
| int retval = -ENOMEM; |
| DEFINE_WAIT(wait); |
| int res; |
| |
| /* allocate memory for our device state and initialize it */ |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) |
| goto error; |
| kref_init(&dev->kref); |
| mutex_init(&dev->io_mutex); |
| spin_lock_init(&dev->lock); |
| init_waitqueue_head(&dev->waitq); |
| |
| dev->udev = usb_get_dev(interface_to_usbdev(interface)); |
| dev->interface = interface; |
| |
| /* set up the endpoint information */ |
| iface_desc = interface->cur_altsetting; |
| res = usb_find_int_in_endpoint(iface_desc, &endpoint); |
| if (res) { |
| dev_err(&interface->dev, "Could not find endpoints\n"); |
| retval = res; |
| goto error; |
| } |
| |
| dev->int_in_endpointAddr = endpoint->bEndpointAddress; |
| |
| /* allocate control URB */ |
| dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!dev->cntl_urb) |
| goto error; |
| |
| /* allocate buffer for control req */ |
| dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL); |
| if (!dev->cntl_req) |
| goto error; |
| |
| /* allocate buffer for control msg */ |
| dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE, |
| GFP_KERNEL, |
| &dev->cntl_urb->transfer_dma); |
| if (!dev->cntl_buffer) { |
| dev_err(&interface->dev, "Could not allocate cntl_buffer\n"); |
| goto error; |
| } |
| |
| /* configure control URB */ |
| dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS | |
| USB_RECIP_INTERFACE; |
| dev->cntl_req->bRequest = HID_REQ_SET_REPORT; |
| dev->cntl_req->wValue = cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8); |
| dev->cntl_req->wIndex = cpu_to_le16(iface_desc->desc.bInterfaceNumber); |
| dev->cntl_req->wLength = cpu_to_le16(YUREX_BUF_SIZE); |
| |
| usb_fill_control_urb(dev->cntl_urb, dev->udev, |
| usb_sndctrlpipe(dev->udev, 0), |
| (void *)dev->cntl_req, dev->cntl_buffer, |
| YUREX_BUF_SIZE, yurex_control_callback, dev); |
| dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| |
| |
| /* allocate interrupt URB */ |
| dev->urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!dev->urb) |
| goto error; |
| |
| /* allocate buffer for interrupt in */ |
| dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE, |
| GFP_KERNEL, &dev->urb->transfer_dma); |
| if (!dev->int_buffer) { |
| dev_err(&interface->dev, "Could not allocate int_buffer\n"); |
| goto error; |
| } |
| |
| /* configure interrupt URB */ |
| usb_fill_int_urb(dev->urb, dev->udev, |
| usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr), |
| dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt, |
| dev, 1); |
| dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| if (usb_submit_urb(dev->urb, GFP_KERNEL)) { |
| retval = -EIO; |
| dev_err(&interface->dev, "Could not submitting URB\n"); |
| goto error; |
| } |
| |
| /* save our data pointer in this interface device */ |
| usb_set_intfdata(interface, dev); |
| dev->bbu = -1; |
| |
| /* we can register the device now, as it is ready */ |
| retval = usb_register_dev(interface, &yurex_class); |
| if (retval) { |
| dev_err(&interface->dev, |
| "Not able to get a minor for this device.\n"); |
| usb_set_intfdata(interface, NULL); |
| goto error; |
| } |
| |
| dev_info(&interface->dev, |
| "USB YUREX device now attached to Yurex #%d\n", |
| interface->minor); |
| |
| return 0; |
| |
| error: |
| 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 */ |
| mutex_lock(&dev->io_mutex); |
| dev->interface = NULL; |
| 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 retval = 0; |
| int bytes_read = 0; |
| char in_buffer[20]; |
| unsigned long flags; |
| |
| dev = file->private_data; |
| |
| mutex_lock(&dev->io_mutex); |
| if (!dev->interface) { /* already disconnected */ |
| retval = -ENODEV; |
| goto exit; |
| } |
| |
| spin_lock_irqsave(&dev->lock, flags); |
| bytes_read = snprintf(in_buffer, 20, "%lld\n", dev->bbu); |
| spin_unlock_irqrestore(&dev->lock, flags); |
| |
| if (*ppos < bytes_read) { |
| if (copy_to_user(buffer, in_buffer + *ppos, bytes_read - *ppos)) |
| retval = -EFAULT; |
| else { |
| retval = bytes_read - *ppos; |
| *ppos += bytes_read; |
| } |
| } |
| |
| exit: |
| mutex_unlock(&dev->io_mutex); |
| return retval; |
| } |
| |
| 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]; |
| char *data = buffer; |
| unsigned long long c, c2 = 0; |
| signed long timeout = 0; |
| DEFINE_WAIT(wait); |
| |
| count = min(sizeof(buffer), 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->interface) { /* 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; |
| } |
| 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++; |
| /* FALL THROUGH */ |
| 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_KERNEL); |
| if (retval >= 0) |
| timeout = schedule_timeout(YUREX_WRITE_TIMEOUT); |
| finish_wait(&dev->waitq, &wait); |
| |
| 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"); |