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kbtab.c

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.h>
#include <asm/unaligned.h>

/*
 * Version Information
 * v0.0.1 - Original, extremely basic version, 2.4.xx only
 * v0.0.2 - Updated, works with 2.5.62 and 2.4.20;
 *           - added pressure-threshold modules param code from
 *              Alex Perry <alex.perry@ieee.org>
 */

#define DRIVER_VERSION "v0.0.2"
#define DRIVER_AUTHOR "Josh Myer <josh@joshisanerd.com>"
#define DRIVER_DESC "USB KB Gear JamStudio Tablet driver"
#define DRIVER_LICENSE "GPL"

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE(DRIVER_LICENSE);

#define USB_VENDOR_ID_KBGEAR  0x084e

static int kb_pressure_click = 0x10;
module_param(kb_pressure_click, int, 0);
MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");

struct kbtab {
      unsigned char *data;
      dma_addr_t data_dma;
      struct input_dev *dev;
      struct usb_device *usbdev;
      struct urb *irq;
      int x, y;
      int button;
      int pressure;
      __u32 serial[2];
      char phys[32];
};

static void kbtab_irq(struct urb *urb)
{
      struct kbtab *kbtab = urb->context;
      unsigned char *data = kbtab->data;
      struct input_dev *dev = kbtab->dev;
      int retval;

      switch (urb->status) {
      case 0:
            /* success */
            break;
      case -ECONNRESET:
      case -ENOENT:
      case -ESHUTDOWN:
            /* this urb is terminated, clean up */
            dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
            return;
      default:
            dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
            goto exit;
      }

      kbtab->x = le16_to_cpu(get_unaligned((__le16 *) &data[1]));
      kbtab->y = le16_to_cpu(get_unaligned((__le16 *) &data[3]));

      kbtab->pressure = (data[5]);

      input_report_key(dev, BTN_TOOL_PEN, 1);

      input_report_abs(dev, ABS_X, kbtab->x);
      input_report_abs(dev, ABS_Y, kbtab->y);

      /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
      input_report_key(dev, BTN_RIGHT, data[0] & 0x02);

      if (-1 == kb_pressure_click) {
            input_report_abs(dev, ABS_PRESSURE, kbtab->pressure);
      } else {
            input_report_key(dev, BTN_LEFT, (kbtab->pressure > kb_pressure_click) ? 1 : 0);
      };

      input_sync(dev);

 exit:
      retval = usb_submit_urb (urb, GFP_ATOMIC);
      if (retval)
            err ("%s - usb_submit_urb failed with result %d",
                 __FUNCTION__, retval);
}

static struct usb_device_id kbtab_ids[] = {
      { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
      { }
};

MODULE_DEVICE_TABLE(usb, kbtab_ids);

static int kbtab_open(struct input_dev *dev)
{
      struct kbtab *kbtab = input_get_drvdata(dev);

      kbtab->irq->dev = kbtab->usbdev;
      if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
            return -EIO;

      return 0;
}

static void kbtab_close(struct input_dev *dev)
{
      struct kbtab *kbtab = input_get_drvdata(dev);

      usb_kill_urb(kbtab->irq);
}

static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
      struct usb_device *dev = interface_to_usbdev(intf);
      struct usb_endpoint_descriptor *endpoint;
      struct kbtab *kbtab;
      struct input_dev *input_dev;
      int error = -ENOMEM;

      kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
      input_dev = input_allocate_device();
      if (!kbtab || !input_dev)
            goto fail1;

      kbtab->data = usb_buffer_alloc(dev, 8, GFP_KERNEL, &kbtab->data_dma);
      if (!kbtab->data)
            goto fail1;

      kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
      if (!kbtab->irq)
            goto fail2;

      kbtab->usbdev = dev;
      kbtab->dev = input_dev;

      usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
      strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));

      input_dev->name = "KB Gear Tablet";
      input_dev->phys = kbtab->phys;
      usb_to_input_id(dev, &input_dev->id);
      input_dev->dev.parent = &intf->dev;

      input_set_drvdata(input_dev, kbtab);

      input_dev->open = kbtab_open;
      input_dev->close = kbtab_close;

      input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) |
            BIT_MASK(EV_MSC);
      input_dev->keybit[BIT_WORD(BTN_LEFT)] |= BIT_MASK(BTN_LEFT) |
            BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
      input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_PEN) |
            BIT_MASK(BTN_TOUCH);
      input_dev->mscbit[0] |= BIT_MASK(MSC_SERIAL);
      input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
      input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
      input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);

      endpoint = &intf->cur_altsetting->endpoint[0].desc;

      usb_fill_int_urb(kbtab->irq, dev,
                   usb_rcvintpipe(dev, endpoint->bEndpointAddress),
                   kbtab->data, 8,
                   kbtab_irq, kbtab, endpoint->bInterval);
      kbtab->irq->transfer_dma = kbtab->data_dma;
      kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

      error = input_register_device(kbtab->dev);
      if (error)
            goto fail3;

      usb_set_intfdata(intf, kbtab);

      return 0;

 fail3:     usb_free_urb(kbtab->irq);
 fail2:     usb_buffer_free(dev, 10, kbtab->data, kbtab->data_dma);
 fail1:     input_free_device(input_dev);
      kfree(kbtab);
      return error;
}

static void kbtab_disconnect(struct usb_interface *intf)
{
      struct kbtab *kbtab = usb_get_intfdata(intf);

      usb_set_intfdata(intf, NULL);
      if (kbtab) {
            usb_kill_urb(kbtab->irq);
            input_unregister_device(kbtab->dev);
            usb_free_urb(kbtab->irq);
            usb_buffer_free(interface_to_usbdev(intf), 10, kbtab->data, kbtab->data_dma);
            kfree(kbtab);
      }
}

static struct usb_driver kbtab_driver = {
      .name =           "kbtab",
      .probe =    kbtab_probe,
      .disconnect =     kbtab_disconnect,
      .id_table = kbtab_ids,
};

static int __init kbtab_init(void)
{
      int retval;
      retval = usb_register(&kbtab_driver);
      if (retval)
            goto out;
      info(DRIVER_VERSION ":" DRIVER_DESC);
out:
      return retval;
}

static void __exit kbtab_exit(void)
{
      usb_deregister(&kbtab_driver);
}

module_init(kbtab_init);
module_exit(kbtab_exit);

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