drivers/input/tablet/kbtab.c

   1 #include <linux/kernel.h>
   2 #include <linux/slab.h>
   3 #include <linux/module.h>
   4 #include <linux/init.h>
   5 #include <linux/usb/input.h>
   6 #include <asm/unaligned.h>
   7
   8 /*
   9  * Version Information
  10  * v0.0.1 - Original, extremely basic version, 2.4.xx only
  11  * v0.0.2 - Updated, works with 2.5.62 and 2.4.20;
  12  *           - added pressure-threshold modules param code from
  13  *              Alex Perry <alex.perry@ieee.org>
  14  */
  15
  16 #define DRIVER_VERSION "v0.0.2"
  17 #define DRIVER_AUTHOR "Josh Myer <josh@joshisanerd.com>"
  18 #define DRIVER_DESC "USB KB Gear JamStudio Tablet driver"
  19 #define DRIVER_LICENSE "GPL"
  20
  21 MODULE_AUTHOR(DRIVER_AUTHOR);
  22 MODULE_DESCRIPTION(DRIVER_DESC);
  23 MODULE_LICENSE(DRIVER_LICENSE);
  24
  25 #define USB_VENDOR_ID_KBGEAR    0x084e
  26
  27 static int kb_pressure_click = 0x10;
  28 module_param(kb_pressure_click, int, 0);
  29 MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
  30
  31 struct kbtab {
  32         unsigned char *data;
  33         dma_addr_t data_dma;
  34         struct input_dev *dev;
  35         struct usb_device *usbdev;
  36         struct usb_interface *intf;
  37         struct urb *irq;
  38         char phys[32];
  39 };
  40
  41 static void kbtab_irq(struct urb *urb)
  42 {
  43         struct kbtab *kbtab = urb->context;
  44         unsigned char *data = kbtab->data;
  45         struct input_dev *dev = kbtab->dev;
  46         int pressure;
  47         int retval;
  48
  49         switch (urb->status) {
  50         case 0:
  51                 /* success */
  52                 break;
  53         case -ECONNRESET:
  54         case -ENOENT:
  55         case -ESHUTDOWN:
  56                 /* this urb is terminated, clean up */
  57                 dev_dbg(&kbtab->intf->dev,
  58                         "%s - urb shutting down with status: %d\n",
  59                         __func__, urb->status);
  60                 return;
  61         default:
  62                 dev_dbg(&kbtab->intf->dev,
  63                         "%s - nonzero urb status received: %d\n",
  64                         __func__, urb->status);
  65                 goto exit;
  66         }
  67
  68
  69         input_report_key(dev, BTN_TOOL_PEN, 1);
  70
  71         input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
  72         input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
  73
  74         /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
  75         input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
  76
  77         pressure = data[5];
  78         if (kb_pressure_click == -1)
  79                 input_report_abs(dev, ABS_PRESSURE, pressure);
  80         else
  81                 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
  82
  83         input_sync(dev);
  84
  85  exit:
  86         retval = usb_submit_urb(urb, GFP_ATOMIC);
  87         if (retval)
  88                 dev_err(&kbtab->intf->dev,
  89                         "%s - usb_submit_urb failed with result %d\n",
  90                         __func__, retval);
  91 }
  92
  93 static struct usb_device_id kbtab_ids[] = {
  94         { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
  95         { }
  96 };
  97
  98 MODULE_DEVICE_TABLE(usb, kbtab_ids);
  99
 100 static int kbtab_open(struct input_dev *dev)
 101 {
 102         struct kbtab *kbtab = input_get_drvdata(dev);
 103
 104         kbtab->irq->dev = kbtab->usbdev;
 105         if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
 106                 return -EIO;
 107
 108         return 0;
 109 }
 110
 111 static void kbtab_close(struct input_dev *dev)
 112 {
 113         struct kbtab *kbtab = input_get_drvdata(dev);
 114
 115         usb_kill_urb(kbtab->irq);
 116 }
 117
 118 static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
 119 {
 120         struct usb_device *dev = interface_to_usbdev(intf);
 121         struct usb_endpoint_descriptor *endpoint;
 122         struct kbtab *kbtab;
 123         struct input_dev *input_dev;
 124         int error = -ENOMEM;
 125
 126         kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
 127         input_dev = input_allocate_device();
 128         if (!kbtab || !input_dev)
 129                 goto fail1;
 130
 131         kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
 132         if (!kbtab->data)
 133                 goto fail1;
 134
 135         kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
 136         if (!kbtab->irq)
 137                 goto fail2;
 138
 139         kbtab->usbdev = dev;
 140         kbtab->intf = intf;
 141         kbtab->dev = input_dev;
 142
 143         usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
 144         strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
 145
 146         input_dev->name = "KB Gear Tablet";
 147         input_dev->phys = kbtab->phys;
 148         usb_to_input_id(dev, &input_dev->id);
 149         input_dev->dev.parent = &intf->dev;
 150
 151         input_set_drvdata(input_dev, kbtab);
 152
 153         input_dev->open = kbtab_open;
 154         input_dev->close = kbtab_close;
 155
 156         input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 157         input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
 158                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
 159         input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
 160                 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
 161         input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
 162         input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
 163         input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
 164
 165         endpoint = &intf->cur_altsetting->endpoint[0].desc;
 166
 167         usb_fill_int_urb(kbtab->irq, dev,
 168                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
 169                          kbtab->data, 8,
 170                          kbtab_irq, kbtab, endpoint->bInterval);
 171         kbtab->irq->transfer_dma = kbtab->data_dma;
 172         kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 173
 174         error = input_register_device(kbtab->dev);
 175         if (error)
 176                 goto fail3;
 177
 178         usb_set_intfdata(intf, kbtab);
 179
 180         return 0;
 181
 182  fail3: usb_free_urb(kbtab->irq);
 183  fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
 184  fail1: input_free_device(input_dev);
 185         kfree(kbtab);
 186         return error;
 187 }
 188
 189 static void kbtab_disconnect(struct usb_interface *intf)
 190 {
 191         struct kbtab *kbtab = usb_get_intfdata(intf);
 192
 193         usb_set_intfdata(intf, NULL);
 194
 195         input_unregister_device(kbtab->dev);
 196         usb_free_urb(kbtab->irq);
 197         usb_free_coherent(kbtab->usbdev, 8, kbtab->data, kbtab->data_dma);
 198         kfree(kbtab);
 199 }
 200
 201 static struct usb_driver kbtab_driver = {
 202         .name =         "kbtab",
 203         .probe =        kbtab_probe,
 204         .disconnect =   kbtab_disconnect,
 205         .id_table =     kbtab_ids,
 206 };
 207
 208 module_usb_driver(kbtab_driver);