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  * Version Information
   9  * v0.0.1 - Original, extremely basic version, 2.4.xx only
  10  * v0.0.2 - Updated, works with 2.5.62 and 2.4.20;
  11  *           - added pressure-threshold modules param code from
  12  *              Alex Perry <alex.perry@ieee.org>
  13  */
  14
  15 #define DRIVER_VERSION "v0.0.2"
  16 #define DRIVER_AUTHOR "Josh Myer <josh@joshisanerd.com>"
  17 #define DRIVER_DESC "USB KB Gear JamStudio Tablet driver"
  18 #define DRIVER_LICENSE "GPL"
  19
  20 MODULE_AUTHOR(DRIVER_AUTHOR);
  21 MODULE_DESCRIPTION(DRIVER_DESC);
  22 MODULE_LICENSE(DRIVER_LICENSE);
  23
  24 #define USB_VENDOR_ID_KBGEAR    0x084e
  25
  26 static int kb_pressure_click = 0x10;
  27 module_param(kb_pressure_click, int, 0);
  28 MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
  29
  30 struct kbtab {
  31         unsigned char *data;
  32         dma_addr_t data_dma;
  33         struct input_dev *dev;
  34         struct usb_interface *intf;
  35         struct urb *irq;
  36         char phys[32];
  37 };
  38
  39 static void kbtab_irq(struct urb *urb)
  40 {
  41         struct kbtab *kbtab = urb->context;
  42         unsigned char *data = kbtab->data;
  43         struct input_dev *dev = kbtab->dev;
  44         int pressure;
  45         int retval;
  46
  47         switch (urb->status) {
  48         case 0:
  49                 /* success */
  50                 break;
  51         case -ECONNRESET:
  52         case -ENOENT:
  53         case -ESHUTDOWN:
  54                 /* this urb is terminated, clean up */
  55                 dev_dbg(&kbtab->intf->dev,
  56                         "%s - urb shutting down with status: %d\n",
  57                         __func__, urb->status);
  58                 return;
  59         default:
  60                 dev_dbg(&kbtab->intf->dev,
  61                         "%s - nonzero urb status received: %d\n",
  62                         __func__, urb->status);
  63                 goto exit;
  64         }
  65
  66
  67         input_report_key(dev, BTN_TOOL_PEN, 1);
  68
  69         input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
  70         input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
  71
  72         /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
  73         input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
  74
  75         pressure = data[5];
  76         if (kb_pressure_click == -1)
  77                 input_report_abs(dev, ABS_PRESSURE, pressure);
  78         else
  79                 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
  80
  81         input_sync(dev);
  82
  83  exit:
  84         retval = usb_submit_urb(urb, GFP_ATOMIC);
  85         if (retval)
  86                 dev_err(&kbtab->intf->dev,
  87                         "%s - usb_submit_urb failed with result %d\n",
  88                         __func__, retval);
  89 }
  90
  91 static struct usb_device_id kbtab_ids[] = {
  92         { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
  93         { }
  94 };
  95
  96 MODULE_DEVICE_TABLE(usb, kbtab_ids);
  97
  98 static int kbtab_open(struct input_dev *dev)
  99 {
 100         struct kbtab *kbtab = input_get_drvdata(dev);
 101         struct usb_device *udev = interface_to_usbdev(kbtab->intf);
 102
 103         kbtab->irq->dev = udev;
 104         if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
 105                 return -EIO;
 106
 107         return 0;
 108 }
 109
 110 static void kbtab_close(struct input_dev *dev)
 111 {
 112         struct kbtab *kbtab = input_get_drvdata(dev);
 113
 114         usb_kill_urb(kbtab->irq);
 115 }
 116
 117 static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
 118 {
 119         struct usb_device *dev = interface_to_usbdev(intf);
 120         struct usb_endpoint_descriptor *endpoint;
 121         struct kbtab *kbtab;
 122         struct input_dev *input_dev;
 123         int error = -ENOMEM;
 124
 125         if (intf->cur_altsetting->desc.bNumEndpoints < 1)
 126                 return -ENODEV;
 127
 128         kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
 129         input_dev = input_allocate_device();
 130         if (!kbtab || !input_dev)
 131                 goto fail1;
 132
 133         kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
 134         if (!kbtab->data)
 135                 goto fail1;
 136
 137         kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
 138         if (!kbtab->irq)
 139                 goto fail2;
 140
 141         kbtab->intf = intf;
 142         kbtab->dev = input_dev;
 143
 144         usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
 145         strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
 146
 147         input_dev->name = "KB Gear Tablet";
 148         input_dev->phys = kbtab->phys;
 149         usb_to_input_id(dev, &input_dev->id);
 150         input_dev->dev.parent = &intf->dev;
 151
 152         input_set_drvdata(input_dev, kbtab);
 153
 154         input_dev->open = kbtab_open;
 155         input_dev->close = kbtab_close;
 156
 157         input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 158         input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
 159                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
 160         input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
 161                 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
 162         input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
 163         input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
 164         input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
 165
 166         endpoint = &intf->cur_altsetting->endpoint[0].desc;
 167
 168         usb_fill_int_urb(kbtab->irq, dev,
 169                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
 170                          kbtab->data, 8,
 171                          kbtab_irq, kbtab, endpoint->bInterval);
 172         kbtab->irq->transfer_dma = kbtab->data_dma;
 173         kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 174
 175         error = input_register_device(kbtab->dev);
 176         if (error)
 177                 goto fail3;
 178
 179         usb_set_intfdata(intf, kbtab);
 180
 181         return 0;
 182
 183  fail3: usb_free_urb(kbtab->irq);
 184  fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
 185  fail1: input_free_device(input_dev);
 186         kfree(kbtab);
 187         return error;
 188 }
 189
 190 static void kbtab_disconnect(struct usb_interface *intf)
 191 {
 192         struct kbtab *kbtab = usb_get_intfdata(intf);
 193         struct usb_device *udev = interface_to_usbdev(intf);
 194
 195         usb_set_intfdata(intf, NULL);
 196
 197         input_unregister_device(kbtab->dev);
 198         usb_free_urb(kbtab->irq);
 199         usb_free_coherent(udev, 8, kbtab->data, kbtab->data_dma);
 200         kfree(kbtab);
 201 }
 202
 203 static struct usb_driver kbtab_driver = {
 204         .name =         "kbtab",
 205         .probe =        kbtab_probe,
 206         .disconnect =   kbtab_disconnect,
 207         .id_table =     kbtab_ids,
 208 };
 209
 210 module_usb_driver(kbtab_driver);