drivers/input/tablet/kbtab.c

   1 #include <linux/kernel.h>
   2 #include <linux/slab.h>
   3 #include <linux/module.h>
   4 #include <linux/usb/input.h>
   5 #include <asm/unaligned.h>
   6
   7 /*
   8  * Pressure-threshold modules param code from Alex Perry <alex.perry@ieee.org>
   9  */
  10
  11 MODULE_AUTHOR("Josh Myer <josh@joshisanerd.com>");
  12 MODULE_DESCRIPTION("USB KB Gear JamStudio Tablet driver");
  13 MODULE_LICENSE("GPL");
  14
  15 #define USB_VENDOR_ID_KBGEAR    0x084e
  16
  17 static int kb_pressure_click = 0x10;
  18 module_param(kb_pressure_click, int, 0);
  19 MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
  20
  21 struct kbtab {
  22         unsigned char *data;
  23         dma_addr_t data_dma;
  24         struct input_dev *dev;
  25         struct usb_interface *intf;
  26         struct urb *irq;
  27         char phys[32];
  28 };
  29
  30 static void kbtab_irq(struct urb *urb)
  31 {
  32         struct kbtab *kbtab = urb->context;
  33         unsigned char *data = kbtab->data;
  34         struct input_dev *dev = kbtab->dev;
  35         int pressure;
  36         int retval;
  37
  38         switch (urb->status) {
  39         case 0:
  40                 /* success */
  41                 break;
  42         case -ECONNRESET:
  43         case -ENOENT:
  44         case -ESHUTDOWN:
  45                 /* this urb is terminated, clean up */
  46                 dev_dbg(&kbtab->intf->dev,
  47                         "%s - urb shutting down with status: %d\n",
  48                         __func__, urb->status);
  49                 return;
  50         default:
  51                 dev_dbg(&kbtab->intf->dev,
  52                         "%s - nonzero urb status received: %d\n",
  53                         __func__, urb->status);
  54                 goto exit;
  55         }
  56
  57
  58         input_report_key(dev, BTN_TOOL_PEN, 1);
  59
  60         input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
  61         input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
  62
  63         /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
  64         input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
  65
  66         pressure = data[5];
  67         if (kb_pressure_click == -1)
  68                 input_report_abs(dev, ABS_PRESSURE, pressure);
  69         else
  70                 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
  71
  72         input_sync(dev);
  73
  74  exit:
  75         retval = usb_submit_urb(urb, GFP_ATOMIC);
  76         if (retval)
  77                 dev_err(&kbtab->intf->dev,
  78                         "%s - usb_submit_urb failed with result %d\n",
  79                         __func__, retval);
  80 }
  81
  82 static const struct usb_device_id kbtab_ids[] = {
  83         { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
  84         { }
  85 };
  86
  87 MODULE_DEVICE_TABLE(usb, kbtab_ids);
  88
  89 static int kbtab_open(struct input_dev *dev)
  90 {
  91         struct kbtab *kbtab = input_get_drvdata(dev);
  92         struct usb_device *udev = interface_to_usbdev(kbtab->intf);
  93
  94         kbtab->irq->dev = udev;
  95         if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
  96                 return -EIO;
  97
  98         return 0;
  99 }
 100
 101 static void kbtab_close(struct input_dev *dev)
 102 {
 103         struct kbtab *kbtab = input_get_drvdata(dev);
 104
 105         usb_kill_urb(kbtab->irq);
 106 }
 107
 108 static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
 109 {
 110         struct usb_device *dev = interface_to_usbdev(intf);
 111         struct usb_endpoint_descriptor *endpoint;
 112         struct kbtab *kbtab;
 113         struct input_dev *input_dev;
 114         int error = -ENOMEM;
 115
 116         if (intf->cur_altsetting->desc.bNumEndpoints < 1)
 117                 return -ENODEV;
 118
 119         endpoint = &intf->cur_altsetting->endpoint[0].desc;
 120         if (!usb_endpoint_is_int_in(endpoint))
 121                 return -ENODEV;
 122
 123         kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
 124         input_dev = input_allocate_device();
 125         if (!kbtab || !input_dev)
 126                 goto fail1;
 127
 128         kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
 129         if (!kbtab->data)
 130                 goto fail1;
 131
 132         kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
 133         if (!kbtab->irq)
 134                 goto fail2;
 135
 136         kbtab->intf = intf;
 137         kbtab->dev = input_dev;
 138
 139         usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
 140         strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
 141
 142         input_dev->name = "KB Gear Tablet";
 143         input_dev->phys = kbtab->phys;
 144         usb_to_input_id(dev, &input_dev->id);
 145         input_dev->dev.parent = &intf->dev;
 146
 147         input_set_drvdata(input_dev, kbtab);
 148
 149         input_dev->open = kbtab_open;
 150         input_dev->close = kbtab_close;
 151
 152         input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 153         input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
 154                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
 155         input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
 156                 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
 157         input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
 158         input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
 159         input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
 160
 161         usb_fill_int_urb(kbtab->irq, dev,
 162                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
 163                          kbtab->data, 8,
 164                          kbtab_irq, kbtab, endpoint->bInterval);
 165         kbtab->irq->transfer_dma = kbtab->data_dma;
 166         kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 167
 168         error = input_register_device(kbtab->dev);
 169         if (error)
 170                 goto fail3;
 171
 172         usb_set_intfdata(intf, kbtab);
 173
 174         return 0;
 175
 176  fail3: usb_free_urb(kbtab->irq);
 177  fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
 178  fail1: input_free_device(input_dev);
 179         kfree(kbtab);
 180         return error;
 181 }
 182
 183 static void kbtab_disconnect(struct usb_interface *intf)
 184 {
 185         struct kbtab *kbtab = usb_get_intfdata(intf);
 186         struct usb_device *udev = interface_to_usbdev(intf);
 187
 188         usb_set_intfdata(intf, NULL);
 189
 190         input_unregister_device(kbtab->dev);
 191         usb_free_urb(kbtab->irq);
 192         usb_free_coherent(udev, 8, kbtab->data, kbtab->data_dma);
 193         kfree(kbtab);
 194 }
 195
 196 static struct usb_driver kbtab_driver = {
 197         .name =         "kbtab",
 198         .probe =        kbtab_probe,
 199         .disconnect =   kbtab_disconnect,
 200         .id_table =     kbtab_ids,
 201 };
 202
 203 module_usb_driver(kbtab_driver);