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 urb *irq;
  37         char phys[32];
  38 };
  39
  40 static void kbtab_irq(struct urb *urb)
  41 {
  42         struct kbtab *kbtab = urb->context;
  43         unsigned char *data = kbtab->data;
  44         struct input_dev *dev = kbtab->dev;
  45         int pressure;
  46         int retval;
  47
  48         switch (urb->status) {
  49         case 0:
  50                 /* success */
  51                 break;
  52         case -ECONNRESET:
  53         case -ENOENT:
  54         case -ESHUTDOWN:
  55                 /* this urb is terminated, clean up */
  56                 dbg("%s - urb shutting down with status: %d", __func__, urb->status);
  57                 return;
  58         default:
  59                 dbg("%s - nonzero urb status received: %d", __func__, urb->status);
  60                 goto exit;
  61         }
  62
  63
  64         input_report_key(dev, BTN_TOOL_PEN, 1);
  65
  66         input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
  67         input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
  68
  69         /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
  70         input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
  71
  72         pressure = data[5];
  73         if (kb_pressure_click == -1)
  74                 input_report_abs(dev, ABS_PRESSURE, pressure);
  75         else
  76                 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
  77
  78         input_sync(dev);
  79
  80  exit:
  81         retval = usb_submit_urb(urb, GFP_ATOMIC);
  82         if (retval)
  83                 err("%s - usb_submit_urb failed with result %d",
  84                      __func__, retval);
  85 }
  86
  87 static struct usb_device_id kbtab_ids[] = {
  88         { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
  89         { }
  90 };
  91
  92 MODULE_DEVICE_TABLE(usb, kbtab_ids);
  93
  94 static int kbtab_open(struct input_dev *dev)
  95 {
  96         struct kbtab *kbtab = input_get_drvdata(dev);
  97
  98         kbtab->irq->dev = kbtab->usbdev;
  99         if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
 100                 return -EIO;
 101
 102         return 0;
 103 }
 104
 105 static void kbtab_close(struct input_dev *dev)
 106 {
 107         struct kbtab *kbtab = input_get_drvdata(dev);
 108
 109         usb_kill_urb(kbtab->irq);
 110 }
 111
 112 static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
 113 {
 114         struct usb_device *dev = interface_to_usbdev(intf);
 115         struct usb_endpoint_descriptor *endpoint;
 116         struct kbtab *kbtab;
 117         struct input_dev *input_dev;
 118         int error = -ENOMEM;
 119
 120         if (intf->cur_altsetting->desc.bNumEndpoints < 1)
 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->usbdev = dev;
 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         endpoint = &intf->cur_altsetting->endpoint[0].desc;
 162
 163         usb_fill_int_urb(kbtab->irq, dev,
 164                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
 165                          kbtab->data, 8,
 166                          kbtab_irq, kbtab, endpoint->bInterval);
 167         kbtab->irq->transfer_dma = kbtab->data_dma;
 168         kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 169
 170         error = input_register_device(kbtab->dev);
 171         if (error)
 172                 goto fail3;
 173
 174         usb_set_intfdata(intf, kbtab);
 175
 176         return 0;
 177
 178  fail3: usb_free_urb(kbtab->irq);
 179  fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
 180  fail1: input_free_device(input_dev);
 181         kfree(kbtab);
 182         return error;
 183 }
 184
 185 static void kbtab_disconnect(struct usb_interface *intf)
 186 {
 187         struct kbtab *kbtab = usb_get_intfdata(intf);
 188
 189         usb_set_intfdata(intf, NULL);
 190
 191         input_unregister_device(kbtab->dev);
 192         usb_free_urb(kbtab->irq);
 193         usb_free_coherent(kbtab->usbdev, 8, kbtab->data, kbtab->data_dma);
 194         kfree(kbtab);
 195 }
 196
 197 static struct usb_driver kbtab_driver = {
 198         .name =         "kbtab",
 199         .probe =        kbtab_probe,
 200         .disconnect =   kbtab_disconnect,
 201         .id_table =     kbtab_ids,
 202 };
 203
 204 static int __init kbtab_init(void)
 205 {
 206         int retval;
 207         retval = usb_register(&kbtab_driver);
 208         if (retval)
 209                 goto out;
 210         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 211                DRIVER_DESC "\n");
 212 out:
 213         return retval;
 214 }
 215
 216 static void __exit kbtab_exit(void)
 217 {
 218         usb_deregister(&kbtab_driver);
 219 }
 220
 221 module_init(kbtab_init);
 222 module_exit(kbtab_exit);