kernel/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_device *usbdev;
  35         struct usb_interface *intf;
  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                 dev_dbg(&kbtab->intf->dev,
  57                         "%s - urb shutting down with status: %d\n",
  58                         __func__, urb->status);
  59                 return;
  60         default:
  61                 dev_dbg(&kbtab->intf->dev,
  62                         "%s - nonzero urb status received: %d\n",
  63                         __func__, urb->status);
  64                 goto exit;
  65         }
  66
  67
  68         input_report_key(dev, BTN_TOOL_PEN, 1);
  69
  70         input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
  71         input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
  72
  73         /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
  74         input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
  75
  76         pressure = data[5];
  77         if (kb_pressure_click == -1)
  78                 input_report_abs(dev, ABS_PRESSURE, pressure);
  79         else
  80                 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
  81
  82         input_sync(dev);
  83
  84  exit:
  85         retval = usb_submit_urb(urb, GFP_ATOMIC);
  86         if (retval)
  87                 dev_err(&kbtab->intf->dev,
  88                         "%s - usb_submit_urb failed with result %d\n",
  89                         __func__, retval);
  90 }
  91
  92 static struct usb_device_id kbtab_ids[] = {
  93         { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
  94         { }
  95 };
  96
  97 MODULE_DEVICE_TABLE(usb, kbtab_ids);
  98
  99 static int kbtab_open(struct input_dev *dev)
 100 {
 101         struct kbtab *kbtab = input_get_drvdata(dev);
 102
 103         kbtab->irq->dev = kbtab->usbdev;
 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         kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
 126         input_dev = input_allocate_device();
 127         if (!kbtab || !input_dev)
 128                 goto fail1;
 129
 130         kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
 131         if (!kbtab->data)
 132                 goto fail1;
 133
 134         kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
 135         if (!kbtab->irq)
 136                 goto fail2;
 137
 138         kbtab->usbdev = dev;
 139         kbtab->intf = intf;
 140         kbtab->dev = input_dev;
 141
 142         usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
 143         strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
 144
 145         input_dev->name = "KB Gear Tablet";
 146         input_dev->phys = kbtab->phys;
 147         usb_to_input_id(dev, &input_dev->id);
 148         input_dev->dev.parent = &intf->dev;
 149
 150         input_set_drvdata(input_dev, kbtab);
 151
 152         input_dev->open = kbtab_open;
 153         input_dev->close = kbtab_close;
 154
 155         input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 156         input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
 157                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
 158         input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
 159                 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
 160         input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
 161         input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
 162         input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
 163
 164         endpoint = &intf->cur_altsetting->endpoint[0].desc;
 165
 166         usb_fill_int_urb(kbtab->irq, dev,
 167                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
 168                          kbtab->data, 8,
 169                          kbtab_irq, kbtab, endpoint->bInterval);
 170         kbtab->irq->transfer_dma = kbtab->data_dma;
 171         kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 172
 173         error = input_register_device(kbtab->dev);
 174         if (error)
 175                 goto fail3;
 176
 177         usb_set_intfdata(intf, kbtab);
 178
 179         return 0;
 180
 181  fail3: usb_free_urb(kbtab->irq);
 182  fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
 183  fail1: input_free_device(input_dev);
 184         kfree(kbtab);
 185         return error;
 186 }
 187
 188 static void kbtab_disconnect(struct usb_interface *intf)
 189 {
 190         struct kbtab *kbtab = usb_get_intfdata(intf);
 191
 192         usb_set_intfdata(intf, NULL);
 193
 194         input_unregister_device(kbtab->dev);
 195         usb_free_urb(kbtab->irq);
 196         usb_free_coherent(kbtab->usbdev, 8, kbtab->data, kbtab->data_dma);
 197         kfree(kbtab);
 198 }
 199
 200 static struct usb_driver kbtab_driver = {
 201         .name =         "kbtab",
 202         .probe =        kbtab_probe,
 203         .disconnect =   kbtab_disconnect,
 204         .id_table =     kbtab_ids,
 205 };
 206
 207 module_usb_driver(kbtab_driver);