--- /dev/null
+/*
+ * Driver for Meywa-Denki & KAYAC YUREX
+ *
+ * Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.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)
+
+/* 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 224 /* not official yet */
+#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) {
+ err("%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);
+
+ dbg("yurex_delete");
+
+ usb_put_dev(dev->udev);
+ 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:
+ err("%s - overflow with length %d, actual length is %d",
+ __func__, YUREX_BUF_SIZE, dev->urb->actual_length);
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ case -EILSEQ:
+ /* The device is terminated, clean up */
+ return;
+ default:
+ err("%s - unknown status received: %d", __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;
+ }
+ dbg("%s count: %lld", __func__, dev->bbu);
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
+ }
+ else
+ dbg("data format error - no EOF");
+ break;
+ case CMD_ACK:
+ dbg("%s ack: %c", __func__, buf[1]);
+ wake_up_interruptible(&dev->waitq);
+ break;
+ }
+
+exit:
+ retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
+ if (retval) {
+ err("%s - usb_submit_urb failed: %d",
+ __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;
+ int i;
+ DEFINE_WAIT(wait);
+
+ /* allocate memory for our device state and initialize it */
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev) {
+ err("Out of memory");
+ 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;
+ for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
+ endpoint = &iface_desc->endpoint[i].desc;
+
+ if (usb_endpoint_is_int_in(endpoint)) {
+ dev->int_in_endpointAddr = endpoint->bEndpointAddress;
+ break;
+ }
+ }
+ if (!dev->int_in_endpointAddr) {
+ retval = -ENODEV;
+ err("Could not find endpoints");
+ goto error;
+ }
+
+
+ /* allocate control URB */
+ dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!dev->cntl_urb) {
+ err("Could not allocate control URB");
+ goto error;
+ }
+
+ /* allocate buffer for control req */
+ dev->cntl_req = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
+ GFP_KERNEL,
+ &dev->cntl_urb->setup_dma);
+ if (!dev->cntl_req) {
+ err("Could not allocate 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) {
+ err("Could not allocate cntl_buffer");
+ 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) {
+ err("Could not allocate 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) {
+ err("Could not allocate int_buffer");
+ 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);
+ if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
+ retval = -EIO;
+ err("Could not submitting URB");
+ goto error;
+ }
+
+ /* save our data pointer in this interface device */
+ usb_set_intfdata(interface, dev);
+
+ /* we can register the device now, as it is ready */
+ retval = usb_register_dev(interface, &yurex_class);
+ if (retval) {
+ err("Not able to get a minor for this device.");
+ usb_set_intfdata(interface, NULL);
+ goto error;
+ }
+
+ dev->bbu = -1;
+
+ 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", 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 = (struct usb_yurex *)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) {
+ 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 = (struct usb_yurex *)file->private_data;
+ if (dev == NULL)
+ return -ENODEV;
+
+ yurex_fasync(-1, file, 0);
+
+ /* decrement the count on our device */
+ kref_put(&dev->kref, yurex_delete);
+ return 0;
+}
+
+static ssize_t yurex_read(struct file *file, char *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 = (struct usb_yurex *)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_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 = (struct usb_yurex *)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) { /* alreaday 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);
+ dbg("%s - submit %c", __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) {
+ err("%s - failed to send bulk msg, error %d", __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,
+};
+
+
+static int __init usb_yurex_init(void)
+{
+ int result;
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&yurex_driver);
+ if (result)
+ err("usb_register failed. Error number %d", result);
+
+ return result;
+}
+
+static void __exit usb_yurex_exit(void)
+{
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&yurex_driver);
+}
+
+module_init(usb_yurex_init);
+module_exit(usb_yurex_exit);
+
+MODULE_LICENSE("GPL");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff