drivers/usb/input/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         signed char *data;
  33         dma_addr_t data_dma;
  34         struct input_dev *dev;
  35         struct usb_device *usbdev;
  36         struct urb *irq;
  37         int x, y;
  38         int button;
  39         int pressure;
  40         __u32 serial[2];
  41         char phys[32];
  42 };
  43
  44 static void kbtab_irq(struct urb *urb, struct pt_regs *regs)
  45 {
  46         struct kbtab *kbtab = urb->context;
  47         unsigned char *data = kbtab->data;
  48         struct input_dev *dev = kbtab->dev;
  49         int retval;
  50
  51         switch (urb->status) {
  52         case 0:
  53                 /* success */
  54                 break;
  55         case -ECONNRESET:
  56         case -ENOENT:
  57         case -ESHUTDOWN:
  58                 /* this urb is terminated, clean up */
  59                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
  60                 return;
  61         default:
  62                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
  63                 goto exit;
  64         }
  65
  66         kbtab->x = le16_to_cpu(get_unaligned((__le16 *) &data[1]));
  67         kbtab->y = le16_to_cpu(get_unaligned((__le16 *) &data[3]));
  68
  69         kbtab->pressure = (data[5]);
  70
  71         input_report_key(dev, BTN_TOOL_PEN, 1);
  72
  73         input_report_abs(dev, ABS_X, kbtab->x);
  74         input_report_abs(dev, ABS_Y, kbtab->y);
  75
  76         /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
  77         input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
  78
  79         if (-1 == kb_pressure_click) {
  80                 input_report_abs(dev, ABS_PRESSURE, kbtab->pressure);
  81         } else {
  82                 input_report_key(dev, BTN_LEFT, (kbtab->pressure > kb_pressure_click) ? 1 : 0);
  83         };
  84
  85         input_sync(dev);
  86
  87  exit:
  88         retval = usb_submit_urb (urb, GFP_ATOMIC);
  89         if (retval)
  90                 err ("%s - usb_submit_urb failed with result %d",
  91                      __FUNCTION__, retval);
  92 }
  93
  94 static struct usb_device_id kbtab_ids[] = {
  95         { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
  96         { }
  97 };
  98
  99 MODULE_DEVICE_TABLE(usb, kbtab_ids);
 100
 101 static int kbtab_open(struct input_dev *dev)
 102 {
 103         struct kbtab *kbtab = dev->private;
 104
 105         kbtab->irq->dev = kbtab->usbdev;
 106         if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
 107                 return -EIO;
 108
 109         return 0;
 110 }
 111
 112 static void kbtab_close(struct input_dev *dev)
 113 {
 114         struct kbtab *kbtab = dev->private;
 115
 116         usb_kill_urb(kbtab->irq);
 117 }
 118
 119 static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
 120 {
 121         struct usb_device *dev = interface_to_usbdev(intf);
 122         struct usb_endpoint_descriptor *endpoint;
 123         struct kbtab *kbtab;
 124         struct input_dev *input_dev;
 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_buffer_alloc(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->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->cdev.dev = &intf->dev;
 149         input_dev->private = kbtab;
 150
 151         input_dev->open = kbtab_open;
 152         input_dev->close = kbtab_close;
 153
 154         input_dev->evbit[0] |= BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_MSC);
 155         input_dev->keybit[LONG(BTN_LEFT)] |= BIT(BTN_LEFT) | BIT(BTN_RIGHT) | BIT(BTN_MIDDLE);
 156         input_dev->keybit[LONG(BTN_DIGI)] |= BIT(BTN_TOOL_PEN) | BIT(BTN_TOUCH);
 157         input_dev->mscbit[0] |= BIT(MSC_SERIAL);
 158         input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
 159         input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
 160         input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
 161
 162         endpoint = &intf->cur_altsetting->endpoint[0].desc;
 163
 164         usb_fill_int_urb(kbtab->irq, dev,
 165                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
 166                          kbtab->data, 8,
 167                          kbtab_irq, kbtab, endpoint->bInterval);
 168         kbtab->irq->transfer_dma = kbtab->data_dma;
 169         kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 170
 171         input_register_device(kbtab->dev);
 172
 173         usb_set_intfdata(intf, kbtab);
 174         return 0;
 175
 176 fail2:  usb_buffer_free(dev, 10, kbtab->data, kbtab->data_dma);
 177 fail1:  input_free_device(input_dev);
 178         kfree(kbtab);
 179         return -ENOMEM;
 180 }
 181
 182 static void kbtab_disconnect(struct usb_interface *intf)
 183 {
 184         struct kbtab *kbtab = usb_get_intfdata(intf);
 185
 186         usb_set_intfdata(intf, NULL);
 187         if (kbtab) {
 188                 usb_kill_urb(kbtab->irq);
 189                 input_unregister_device(kbtab->dev);
 190                 usb_free_urb(kbtab->irq);
 191                 usb_buffer_free(interface_to_usbdev(intf), 10, kbtab->data, kbtab->data_dma);
 192                 kfree(kbtab);
 193         }
 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 static int __init kbtab_init(void)
 204 {
 205         int retval;
 206         retval = usb_register(&kbtab_driver);
 207         if (retval)
 208                 goto out;
 209         info(DRIVER_VERSION ":" DRIVER_DESC);
 210 out:
 211         return retval;
 212 }
 213
 214 static void __exit kbtab_exit(void)
 215 {
 216         usb_deregister(&kbtab_driver);
 217 }
 218
 219 module_init(kbtab_init);
 220 module_exit(kbtab_exit);