drivers/usb/input/kbtab.c

   1 #include <linux/kernel.h>
   2 #include <linux/slab.h>
   3 #include <linux/input.h>
   4 #include <linux/module.h>
   5 #include <linux/init.h>
   6 #include <linux/usb.h>
   7 #include <asm/unaligned.h>
   8 #include <asm/byteorder.h>
   9
  10 /*
  11  * Version Information
  12  * v0.0.1 - Original, extremely basic version, 2.4.xx only
  13  * v0.0.2 - Updated, works with 2.5.62 and 2.4.20;
  14  *           - added pressure-threshold modules param code from
  15  *              Alex Perry <alex.perry@ieee.org>
  16  */
  17
  18 #define DRIVER_VERSION "v0.0.2"
  19 #define DRIVER_AUTHOR "Josh Myer <josh@joshisanerd.com>"
  20 #define DRIVER_DESC "USB KB Gear JamStudio Tablet driver"
  21 #define DRIVER_LICENSE "GPL"
  22
  23 MODULE_AUTHOR(DRIVER_AUTHOR);
  24 MODULE_DESCRIPTION(DRIVER_DESC);
  25 MODULE_LICENSE(DRIVER_LICENSE);
  26
  27 #define USB_VENDOR_ID_KBGEAR    0x084e
  28
  29 static int kb_pressure_click = 0x10;
  30 module_param(kb_pressure_click, int, 0);
  31 MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
  32
  33 struct kbtab {
  34         signed char *data;
  35         dma_addr_t data_dma;
  36         struct input_dev dev;
  37         struct usb_device *usbdev;
  38         struct urb *irq;
  39         int open;
  40         int x, y;
  41         int button;
  42         int pressure;
  43         __u32 serial[2];
  44         char phys[32];
  45 };
  46
  47 static void kbtab_irq(struct urb *urb, struct pt_regs *regs)
  48 {
  49         struct kbtab *kbtab = urb->context;
  50         unsigned char *data = kbtab->data;
  51         struct input_dev *dev = &kbtab->dev;
  52         int retval;
  53
  54         switch (urb->status) {
  55         case 0:
  56                 /* success */
  57                 break;
  58         case -ECONNRESET:
  59         case -ENOENT:
  60         case -ESHUTDOWN:
  61                 /* this urb is terminated, clean up */
  62                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
  63                 return;
  64         default:
  65                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
  66                 goto exit;
  67         }
  68
  69         kbtab->x = le16_to_cpu(get_unaligned((__le16 *) &data[1]));
  70         kbtab->y = le16_to_cpu(get_unaligned((__le16 *) &data[3]));
  71
  72         kbtab->pressure = (data[5]);
  73
  74         input_report_key(dev, BTN_TOOL_PEN, 1);
  75
  76         input_report_abs(dev, ABS_X, kbtab->x);
  77         input_report_abs(dev, ABS_Y, kbtab->y);
  78
  79         /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
  80         input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
  81
  82         if (-1 == kb_pressure_click) {
  83                 input_report_abs(dev, ABS_PRESSURE, kbtab->pressure);
  84         } else {
  85                 input_report_key(dev, BTN_LEFT, (kbtab->pressure > kb_pressure_click) ? 1 : 0);
  86         };
  87
  88         input_sync(dev);
  89
  90  exit:
  91         retval = usb_submit_urb (urb, GFP_ATOMIC);
  92         if (retval)
  93                 err ("%s - usb_submit_urb failed with result %d",
  94                      __FUNCTION__, retval);
  95 }
  96
  97 static struct usb_device_id kbtab_ids[] = {
  98         { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
  99         { }
 100 };
 101
 102 MODULE_DEVICE_TABLE(usb, kbtab_ids);
 103
 104 static int kbtab_open(struct input_dev *dev)
 105 {
 106         struct kbtab *kbtab = dev->private;
 107
 108         if (kbtab->open++)
 109                 return 0;
 110
 111         kbtab->irq->dev = kbtab->usbdev;
 112         if (usb_submit_urb(kbtab->irq, GFP_KERNEL)) {
 113                 kbtab->open--;
 114                 return -EIO;
 115         }
 116
 117         return 0;
 118 }
 119
 120 static void kbtab_close(struct input_dev *dev)
 121 {
 122         struct kbtab *kbtab = dev->private;
 123
 124         if (!--kbtab->open)
 125                 usb_kill_urb(kbtab->irq);
 126 }
 127
 128 static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
 129 {
 130         struct usb_device *dev = interface_to_usbdev(intf);
 131         struct usb_endpoint_descriptor *endpoint;
 132         struct kbtab *kbtab;
 133         char path[64];
 134
 135         if (!(kbtab = kmalloc(sizeof(struct kbtab), GFP_KERNEL)))
 136                 return -ENOMEM;
 137         memset(kbtab, 0, sizeof(struct kbtab));
 138
 139         kbtab->data = usb_buffer_alloc(dev, 8, GFP_KERNEL, &kbtab->data_dma);
 140         if (!kbtab->data) {
 141                 kfree(kbtab);
 142                 return -ENOMEM;
 143         }
 144
 145         kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
 146         if (!kbtab->irq) {
 147                 usb_buffer_free(dev, 10, kbtab->data, kbtab->data_dma);
 148                 kfree(kbtab);
 149                 return -ENOMEM;
 150         }
 151
 152         kbtab->dev.evbit[0] |= BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_MSC);
 153         kbtab->dev.absbit[0] |= BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
 154
 155         kbtab->dev.keybit[LONG(BTN_LEFT)] |= BIT(BTN_LEFT) | BIT(BTN_RIGHT) | BIT(BTN_MIDDLE);
 156
 157         kbtab->dev.keybit[LONG(BTN_DIGI)] |= BIT(BTN_TOOL_PEN) | BIT(BTN_TOUCH);
 158
 159         kbtab->dev.mscbit[0] |= BIT(MSC_SERIAL);
 160
 161         kbtab->dev.absmax[ABS_X] = 0x2000;
 162         kbtab->dev.absmax[ABS_Y] = 0x1750;
 163         kbtab->dev.absmax[ABS_PRESSURE] = 0xff;
 164
 165         kbtab->dev.absfuzz[ABS_X] = 4;
 166         kbtab->dev.absfuzz[ABS_Y] = 4;
 167
 168         kbtab->dev.private = kbtab;
 169         kbtab->dev.open = kbtab_open;
 170         kbtab->dev.close = kbtab_close;
 171
 172         usb_make_path(dev, path, 64);
 173         sprintf(kbtab->phys, "%s/input0", path);
 174
 175         kbtab->dev.name = "KB Gear Tablet";
 176         kbtab->dev.phys = kbtab->phys;
 177         kbtab->dev.id.bustype = BUS_USB;
 178         kbtab->dev.id.vendor = le16_to_cpu(dev->descriptor.idVendor);
 179         kbtab->dev.id.product = le16_to_cpu(dev->descriptor.idProduct);
 180         kbtab->dev.id.version = le16_to_cpu(dev->descriptor.bcdDevice);
 181         kbtab->dev.dev = &intf->dev;
 182         kbtab->usbdev = dev;
 183
 184         endpoint = &intf->cur_altsetting->endpoint[0].desc;
 185
 186         usb_fill_int_urb(kbtab->irq, dev,
 187                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
 188                          kbtab->data, 8,
 189                          kbtab_irq, kbtab, endpoint->bInterval);
 190         kbtab->irq->transfer_dma = kbtab->data_dma;
 191         kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 192
 193         input_register_device(&kbtab->dev);
 194
 195         printk(KERN_INFO "input: KB Gear Tablet on %s\n",  path);
 196
 197         usb_set_intfdata(intf, kbtab);
 198
 199         return 0;
 200 }
 201
 202 static void kbtab_disconnect(struct usb_interface *intf)
 203 {
 204         struct kbtab *kbtab = usb_get_intfdata (intf);
 205
 206         usb_set_intfdata(intf, NULL);
 207         if (kbtab) {
 208                 usb_kill_urb(kbtab->irq);
 209                 input_unregister_device(&kbtab->dev);
 210                 usb_free_urb(kbtab->irq);
 211                 usb_buffer_free(interface_to_usbdev(intf), 10, kbtab->data, kbtab->data_dma);
 212                 kfree(kbtab);
 213         }
 214 }
 215
 216 static struct usb_driver kbtab_driver = {
 217         .owner =        THIS_MODULE,
 218         .name =         "kbtab",
 219         .probe =        kbtab_probe,
 220         .disconnect =   kbtab_disconnect,
 221         .id_table =     kbtab_ids,
 222 };
 223
 224 static int __init kbtab_init(void)
 225 {
 226         int retval;
 227         retval = usb_register(&kbtab_driver);
 228         if (retval)
 229                 goto out;
 230         info(DRIVER_VERSION ":" DRIVER_DESC);
 231 out:
 232         return retval;
 233 }
 234
 235 static void __exit kbtab_exit(void)
 236 {
 237         usb_deregister(&kbtab_driver);
 238 }
 239
 240 module_init(kbtab_init);
 241 module_exit(kbtab_exit);