drivers/usb/input/touchkitusb.c

   1 /******************************************************************************
   2  * touchkitusb.c  --  Driver for eGalax TouchKit USB Touchscreens
   3  *
   4  * Copyright (C) 2004 by Daniel Ritz
   5  * Copyright (C) by Todd E. Johnson (mtouchusb.c)
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  * Based upon mtouchusb.c
  22  *
  23  *****************************************************************************/
  24
  25 //#define DEBUG
  26
  27 #include <linux/config.h>
  28 #include <linux/kernel.h>
  29 #include <linux/slab.h>
  30 #include <linux/input.h>
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33
  34 #if !defined(DEBUG) && defined(CONFIG_USB_DEBUG)
  35 #define DEBUG
  36 #endif
  37 #include <linux/usb.h>
  38
  39
  40 #define TOUCHKIT_MIN_XC                 0x0
  41 #define TOUCHKIT_MAX_XC                 0x07ff
  42 #define TOUCHKIT_XC_FUZZ                0x0
  43 #define TOUCHKIT_XC_FLAT                0x0
  44 #define TOUCHKIT_MIN_YC                 0x0
  45 #define TOUCHKIT_MAX_YC                 0x07ff
  46 #define TOUCHKIT_YC_FUZZ                0x0
  47 #define TOUCHKIT_YC_FLAT                0x0
  48 #define TOUCHKIT_REPORT_DATA_SIZE       8
  49
  50 #define TOUCHKIT_DOWN                   0x01
  51 #define TOUCHKIT_POINT_TOUCH            0x81
  52 #define TOUCHKIT_POINT_NOTOUCH          0x80
  53
  54 #define TOUCHKIT_GET_TOUCHED(dat)       ((((dat)[0]) & TOUCHKIT_DOWN) ? 1 : 0)
  55 #define TOUCHKIT_GET_X(dat)             (((dat)[3] << 7) | (dat)[4])
  56 #define TOUCHKIT_GET_Y(dat)             (((dat)[1] << 7) | (dat)[2])
  57
  58 #define DRIVER_VERSION                  "v0.1"
  59 #define DRIVER_AUTHOR                   "Daniel Ritz <daniel.ritz@gmx.ch>"
  60 #define DRIVER_DESC                     "eGalax TouchKit USB HID Touchscreen Driver"
  61
  62 static int swap_xy;
  63 module_param(swap_xy, bool, 0644);
  64 MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");
  65
  66 struct touchkit_usb {
  67         unsigned char *data;
  68         dma_addr_t data_dma;
  69         struct urb *irq;
  70         struct usb_device *udev;
  71         struct input_dev input;
  72         int open;
  73         char name[128];
  74         char phys[64];
  75 };
  76
  77 static struct usb_device_id touchkit_devices[] = {
  78         {USB_DEVICE(0x3823, 0x0001)},
  79         {USB_DEVICE(0x0eef, 0x0001)},
  80         {}
  81 };
  82
  83 static void touchkit_irq(struct urb *urb, struct pt_regs *regs)
  84 {
  85         struct touchkit_usb *touchkit = urb->context;
  86         int retval;
  87         int x, y;
  88
  89         switch (urb->status) {
  90         case 0:
  91                 /* success */
  92                 break;
  93         case -ETIMEDOUT:
  94                 /* this urb is timing out */
  95                 dbg("%s - urb timed out - was the device unplugged?",
  96                     __FUNCTION__);
  97                 return;
  98         case -ECONNRESET:
  99         case -ENOENT:
 100         case -ESHUTDOWN:
 101                 /* this urb is terminated, clean up */
 102                 dbg("%s - urb shutting down with status: %d",
 103                     __FUNCTION__, urb->status);
 104                 return;
 105         default:
 106                 dbg("%s - nonzero urb status received: %d",
 107                     __FUNCTION__, urb->status);
 108                 goto exit;
 109         }
 110
 111         if (swap_xy) {
 112                 y = TOUCHKIT_GET_X(touchkit->data);
 113                 x = TOUCHKIT_GET_Y(touchkit->data);
 114         } else {
 115                 x = TOUCHKIT_GET_X(touchkit->data);
 116                 y = TOUCHKIT_GET_Y(touchkit->data);
 117         }
 118
 119         input_regs(&touchkit->input, regs);
 120         input_report_key(&touchkit->input, BTN_TOUCH,
 121                          TOUCHKIT_GET_TOUCHED(touchkit->data));
 122         input_report_abs(&touchkit->input, ABS_X, x);
 123         input_report_abs(&touchkit->input, ABS_Y, y);
 124         input_sync(&touchkit->input);
 125
 126 exit:
 127         retval = usb_submit_urb(urb, GFP_ATOMIC);
 128         if (retval)
 129                 err("%s - usb_submit_urb failed with result: %d",
 130                     __FUNCTION__, retval);
 131 }
 132
 133 static int touchkit_open(struct input_dev *input)
 134 {
 135         struct touchkit_usb *touchkit = input->private;
 136
 137         if (touchkit->open++)
 138                 return 0;
 139
 140         touchkit->irq->dev = touchkit->udev;
 141
 142         if (usb_submit_urb(touchkit->irq, GFP_ATOMIC)) {
 143                 touchkit->open--;
 144                 return -EIO;
 145         }
 146
 147         return 0;
 148 }
 149
 150 static void touchkit_close(struct input_dev *input)
 151 {
 152         struct touchkit_usb *touchkit = input->private;
 153
 154         if (!--touchkit->open)
 155                 usb_kill_urb(touchkit->irq);
 156 }
 157
 158 static int touchkit_alloc_buffers(struct usb_device *udev,
 159                                   struct touchkit_usb *touchkit)
 160 {
 161         touchkit->data = usb_buffer_alloc(udev, TOUCHKIT_REPORT_DATA_SIZE,
 162                                           SLAB_ATOMIC, &touchkit->data_dma);
 163
 164         if (!touchkit->data)
 165                 return -1;
 166
 167         return 0;
 168 }
 169
 170 static void touchkit_free_buffers(struct usb_device *udev,
 171                                   struct touchkit_usb *touchkit)
 172 {
 173         if (touchkit->data)
 174                 usb_buffer_free(udev, TOUCHKIT_REPORT_DATA_SIZE,
 175                                 touchkit->data, touchkit->data_dma);
 176 }
 177
 178 static int touchkit_probe(struct usb_interface *intf,
 179                           const struct usb_device_id *id)
 180 {
 181         int ret;
 182         struct touchkit_usb *touchkit;
 183         struct usb_host_interface *interface;
 184         struct usb_endpoint_descriptor *endpoint;
 185         struct usb_device *udev = interface_to_usbdev(intf);
 186         char path[64];
 187
 188         interface = intf->cur_altsetting;
 189         endpoint = &interface->endpoint[0].desc;
 190
 191         touchkit = kmalloc(sizeof(struct touchkit_usb), GFP_KERNEL);
 192         if (!touchkit)
 193                 return -ENOMEM;
 194
 195         memset(touchkit, 0, sizeof(struct touchkit_usb));
 196         touchkit->udev = udev;
 197
 198         if (touchkit_alloc_buffers(udev, touchkit)) {
 199                 ret = -ENOMEM;
 200                 goto out_free;
 201         }
 202
 203         touchkit->input.private = touchkit;
 204         touchkit->input.open = touchkit_open;
 205         touchkit->input.close = touchkit_close;
 206
 207         usb_make_path(udev, path, 64);
 208         sprintf(touchkit->phys, "%s/input0", path);
 209
 210         touchkit->input.name = touchkit->name;
 211         touchkit->input.phys = touchkit->phys;
 212         touchkit->input.id.bustype = BUS_USB;
 213         touchkit->input.id.vendor = le16_to_cpu(udev->descriptor.idVendor);
 214         touchkit->input.id.product = le16_to_cpu(udev->descriptor.idProduct);
 215         touchkit->input.id.version = le16_to_cpu(udev->descriptor.bcdDevice);
 216         touchkit->input.dev = &intf->dev;
 217
 218         touchkit->input.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 219         touchkit->input.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
 220         touchkit->input.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 221
 222         /* Used to Scale Compensated Data */
 223         touchkit->input.absmin[ABS_X] = TOUCHKIT_MIN_XC;
 224         touchkit->input.absmax[ABS_X] = TOUCHKIT_MAX_XC;
 225         touchkit->input.absfuzz[ABS_X] = TOUCHKIT_XC_FUZZ;
 226         touchkit->input.absflat[ABS_X] = TOUCHKIT_XC_FLAT;
 227         touchkit->input.absmin[ABS_Y] = TOUCHKIT_MIN_YC;
 228         touchkit->input.absmax[ABS_Y] = TOUCHKIT_MAX_YC;
 229         touchkit->input.absfuzz[ABS_Y] = TOUCHKIT_YC_FUZZ;
 230         touchkit->input.absflat[ABS_Y] = TOUCHKIT_YC_FLAT;
 231
 232         if (udev->manufacturer)
 233                 strcat(touchkit->name, udev->manufacturer);
 234         if (udev->product)
 235                 sprintf(touchkit->name, "%s %s", touchkit->name, udev->product);
 236
 237         if (!strlen(touchkit->name))
 238                 sprintf(touchkit->name, "USB Touchscreen %04x:%04x",
 239                         touchkit->input.id.vendor, touchkit->input.id.product);
 240
 241         touchkit->irq = usb_alloc_urb(0, GFP_KERNEL);
 242         if (!touchkit->irq) {
 243                 dbg("%s - usb_alloc_urb failed: touchkit->irq", __FUNCTION__);
 244                 ret = -ENOMEM;
 245                 goto out_free_buffers;
 246         }
 247
 248         usb_fill_int_urb(touchkit->irq, touchkit->udev,
 249                          usb_rcvintpipe(touchkit->udev, 0x81),
 250                          touchkit->data, TOUCHKIT_REPORT_DATA_SIZE,
 251                          touchkit_irq, touchkit, endpoint->bInterval);
 252
 253         input_register_device(&touchkit->input);
 254
 255         printk(KERN_INFO "input: %s on %s\n", touchkit->name, path);
 256         usb_set_intfdata(intf, touchkit);
 257
 258         return 0;
 259
 260 out_free_buffers:
 261         touchkit_free_buffers(udev, touchkit);
 262 out_free:
 263         kfree(touchkit);
 264         return ret;
 265 }
 266
 267 static void touchkit_disconnect(struct usb_interface *intf)
 268 {
 269         struct touchkit_usb *touchkit = usb_get_intfdata(intf);
 270
 271         dbg("%s - called", __FUNCTION__);
 272
 273         if (!touchkit)
 274                 return;
 275
 276         dbg("%s - touchkit is initialized, cleaning up", __FUNCTION__);
 277         usb_set_intfdata(intf, NULL);
 278         input_unregister_device(&touchkit->input);
 279         usb_kill_urb(touchkit->irq);
 280         usb_free_urb(touchkit->irq);
 281         touchkit_free_buffers(interface_to_usbdev(intf), touchkit);
 282         kfree(touchkit);
 283 }
 284
 285 MODULE_DEVICE_TABLE(usb, touchkit_devices);
 286
 287 static struct usb_driver touchkit_driver = {
 288         .owner          = THIS_MODULE,
 289         .name           = "touchkitusb",
 290         .probe          = touchkit_probe,
 291         .disconnect     = touchkit_disconnect,
 292         .id_table       = touchkit_devices,
 293 };
 294
 295 static int __init touchkit_init(void)
 296 {
 297         return usb_register(&touchkit_driver);
 298 }
 299
 300 static void __exit touchkit_cleanup(void)
 301 {
 302         usb_deregister(&touchkit_driver);
 303 }
 304
 305 module_init(touchkit_init);
 306 module_exit(touchkit_cleanup);
 307
 308 MODULE_AUTHOR(DRIVER_AUTHOR);
 309 MODULE_DESCRIPTION(DRIVER_DESC);
 310 MODULE_LICENSE("GPL");