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#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb.h>
#include <asm/unaligned.h>
#include <asm/byteorder.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 {
signed char *data;
dma_addr_t data_dma;
struct input_dev dev;
struct usb_device *usbdev;
struct urb *irq;
int open;
int x, y;
int button;
int pressure;
__u32 serial[2];
char phys[32];
};
static void kbtab_irq(struct urb *urb, struct pt_regs *regs)
{
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 = dev->private;
if (kbtab->open++)
return 0;
kbtab->irq->dev = kbtab->usbdev;
if (usb_submit_urb(kbtab->irq, GFP_KERNEL)) {
kbtab->open--;
return -EIO;
}
return 0;
}
static void kbtab_close(struct input_dev *dev)
{
struct kbtab *kbtab = dev->private;
if (!--kbtab->open)
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;
char path[64];
if (!(kbtab = kmalloc(sizeof(struct kbtab), GFP_KERNEL)))
return -ENOMEM;
memset(kbtab, 0, sizeof(struct kbtab));
kbtab->data = usb_buffer_alloc(dev, 8, GFP_KERNEL, &kbtab->data_dma);
if (!kbtab->data) {
kfree(kbtab);
return -ENOMEM;
}
kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
if (!kbtab->irq) {
usb_buffer_free(dev, 10, kbtab->data, kbtab->data_dma);
kfree(kbtab);
return -ENOMEM;
}
kbtab->dev.evbit[0] |= BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_MSC);
kbtab->dev.absbit[0] |= BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
kbtab->dev.keybit[LONG(BTN_LEFT)] |= BIT(BTN_LEFT) | BIT(BTN_RIGHT) | BIT(BTN_MIDDLE);
kbtab->dev.keybit[LONG(BTN_DIGI)] |= BIT(BTN_TOOL_PEN) | BIT(BTN_TOUCH);
kbtab->dev.mscbit[0] |= BIT(MSC_SERIAL);
kbtab->dev.absmax[ABS_X] = 0x2000;
kbtab->dev.absmax[ABS_Y] = 0x1750;
kbtab->dev.absmax[ABS_PRESSURE] = 0xff;
kbtab->dev.absfuzz[ABS_X] = 4;
kbtab->dev.absfuzz[ABS_Y] = 4;
kbtab->dev.private = kbtab;
kbtab->dev.open = kbtab_open;
kbtab->dev.close = kbtab_close;
usb_make_path(dev, path, 64);
sprintf(kbtab->phys, "%s/input0", path);
kbtab->dev.name = "KB Gear Tablet";
kbtab->dev.phys = kbtab->phys;
kbtab->dev.id.bustype = BUS_USB;
kbtab->dev.id.vendor = le16_to_cpu(dev->descriptor.idVendor);
kbtab->dev.id.product = le16_to_cpu(dev->descriptor.idProduct);
kbtab->dev.id.version = le16_to_cpu(dev->descriptor.bcdDevice);
kbtab->dev.dev = &intf->dev;
kbtab->usbdev = dev;
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;
input_register_device(&kbtab->dev);
printk(KERN_INFO "input: KB Gear Tablet on %s\n", path);
usb_set_intfdata(intf, kbtab);
return 0;
}
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 = {
.owner = THIS_MODULE,
.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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