drivers/usb/input/mtouchusb.c

   1 /******************************************************************************
   2  * mtouchusb.c  --  Driver for Microtouch (Now 3M) USB Touchscreens
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  *
  18  * Based upon original work by Radoslaw Garbacz (usb-support@ite.pl)
  19  *  (http://freshmeat.net/projects/3mtouchscreendriver)
  20  *
  21  * History
  22  *
  23  *  0.3 & 0.4  2002 (TEJ) tejohnson@yahoo.com
  24  *    Updated to 2.4.18, then 2.4.19
  25  *    Old version still relied on stealing a minor
  26  *
  27  *  0.5  02/26/2004 (TEJ) tejohnson@yahoo.com
  28  *    Complete rewrite using Linux Input in 2.6.3
  29  *    Unfortunately no calibration support at this time
  30  *
  31  *  1.4 04/25/2004 (TEJ) tejohnson@yahoo.com
  32  *    Changed reset from standard USB dev reset to vendor reset
  33  *    Changed data sent to host from compensated to raw coordinates
  34  *    Eliminated vendor/product module params
  35  *    Performed multiple successfull tests with an EXII-5010UC
  36  *
  37  *  1.5 02/27/2005 ddstreet@ieee.org
  38  *    Added module parameter to select raw or hw-calibrated coordinate reporting
  39  *
  40  *****************************************************************************/
  41
  42 #include <linux/config.h>
  43
  44 #ifdef CONFIG_USB_DEBUG
  45         #define DEBUG
  46 #else
  47         #undef DEBUG
  48 #endif
  49
  50 #include <linux/kernel.h>
  51 #include <linux/slab.h>
  52 #include <linux/input.h>
  53 #include <linux/module.h>
  54 #include <linux/init.h>
  55 #include <linux/usb.h>
  56
  57 #define MTOUCHUSB_MIN_XC                0x0
  58 #define MTOUCHUSB_MAX_RAW_XC            0x4000
  59 #define MTOUCHUSB_MAX_CALIB_XC          0xffff
  60 #define MTOUCHUSB_XC_FUZZ               0x0
  61 #define MTOUCHUSB_XC_FLAT               0x0
  62 #define MTOUCHUSB_MIN_YC                0x0
  63 #define MTOUCHUSB_MAX_RAW_YC            0x4000
  64 #define MTOUCHUSB_MAX_CALIB_YC          0xffff
  65 #define MTOUCHUSB_YC_FUZZ               0x0
  66 #define MTOUCHUSB_YC_FLAT               0x0
  67
  68 #define MTOUCHUSB_ASYNC_REPORT          1
  69 #define MTOUCHUSB_RESET                 7
  70 #define MTOUCHUSB_REPORT_DATA_SIZE      11
  71 #define MTOUCHUSB_REQ_CTRLLR_ID         10
  72
  73 #define MTOUCHUSB_GET_RAW_XC(data)      (data[8]<<8 | data[7])
  74 #define MTOUCHUSB_GET_CALIB_XC(data)    (data[4]<<8 | data[3])
  75 #define MTOUCHUSB_GET_RAW_YC(data)      (data[10]<<8 | data[9])
  76 #define MTOUCHUSB_GET_CALIB_YC(data)    (data[6]<<8 | data[5])
  77 #define MTOUCHUSB_GET_XC(data)          (raw_coordinates ? \
  78                                          MTOUCHUSB_GET_RAW_XC(data) : \
  79                                          MTOUCHUSB_GET_CALIB_XC(data))
  80 #define MTOUCHUSB_GET_YC(data)          (raw_coordinates ? \
  81                                          MTOUCHUSB_GET_RAW_YC(data) : \
  82                                          MTOUCHUSB_GET_CALIB_YC(data))
  83 #define MTOUCHUSB_GET_TOUCHED(data)     ((data[2] & 0x40) ? 1:0)
  84
  85 #define DRIVER_VERSION "v1.5"
  86 #define DRIVER_AUTHOR "Todd E. Johnson, tejohnson@yahoo.com"
  87 #define DRIVER_DESC "3M USB Touchscreen Driver"
  88 #define DRIVER_LICENSE "GPL"
  89
  90 static int raw_coordinates = 1;
  91
  92 module_param(raw_coordinates, bool, S_IRUGO | S_IWUSR);
  93 MODULE_PARM_DESC(raw_coordinates, "report raw coordinate values (y, default) or hardware-calibrated coordinate values (n)");
  94
  95 struct mtouch_usb {
  96         unsigned char *data;
  97         dma_addr_t data_dma;
  98         struct urb *irq;
  99         struct usb_device *udev;
 100         struct input_dev input;
 101         int open;
 102         char name[128];
 103         char phys[64];
 104 };
 105
 106 static struct usb_device_id mtouchusb_devices [] = {
 107         { USB_DEVICE(0x0596, 0x0001) },
 108         { }
 109 };
 110
 111 static void mtouchusb_irq(struct urb *urb, struct pt_regs *regs)
 112 {
 113         struct mtouch_usb *mtouch = urb->context;
 114         int retval;
 115
 116         switch (urb->status) {
 117                 case 0:
 118                         /* success */
 119                         break;
 120                 case -ETIMEDOUT:
 121                         /* this urb is timing out */
 122                         dbg("%s - urb timed out - was the device unplugged?",
 123                             __FUNCTION__);
 124                         return;
 125                 case -ECONNRESET:
 126                 case -ENOENT:
 127                 case -ESHUTDOWN:
 128                         /* this urb is terminated, clean up */
 129                         dbg("%s - urb shutting down with status: %d",
 130                             __FUNCTION__, urb->status);
 131                         return;
 132                 default:
 133                         dbg("%s - nonzero urb status received: %d",
 134                             __FUNCTION__, urb->status);
 135                         goto exit;
 136         }
 137
 138         input_regs(&mtouch->input, regs);
 139         input_report_key(&mtouch->input, BTN_TOUCH,
 140                          MTOUCHUSB_GET_TOUCHED(mtouch->data));
 141         input_report_abs(&mtouch->input, ABS_X,
 142                          MTOUCHUSB_GET_XC(mtouch->data));
 143         input_report_abs(&mtouch->input, ABS_Y,
 144                          (raw_coordinates ? MTOUCHUSB_MAX_RAW_YC : MTOUCHUSB_MAX_CALIB_YC)
 145                          - MTOUCHUSB_GET_YC(mtouch->data));
 146         input_sync(&mtouch->input);
 147
 148 exit:
 149         retval = usb_submit_urb (urb, GFP_ATOMIC);
 150         if (retval)
 151                 err ("%s - usb_submit_urb failed with result: %d",
 152                      __FUNCTION__, retval);
 153 }
 154
 155 static int mtouchusb_open (struct input_dev *input)
 156 {
 157         struct mtouch_usb *mtouch = input->private;
 158
 159         if (mtouch->open++)
 160                 return 0;
 161
 162         mtouch->irq->dev = mtouch->udev;
 163
 164         if (usb_submit_urb (mtouch->irq, GFP_ATOMIC)) {
 165                 mtouch->open--;
 166                 return -EIO;
 167         }
 168
 169         return 0;
 170 }
 171
 172 static void mtouchusb_close (struct input_dev *input)
 173 {
 174         struct mtouch_usb *mtouch = input->private;
 175
 176         if (!--mtouch->open)
 177                 usb_kill_urb (mtouch->irq);
 178 }
 179
 180 static int mtouchusb_alloc_buffers(struct usb_device *udev, struct mtouch_usb *mtouch)
 181 {
 182         dbg("%s - called", __FUNCTION__);
 183
 184         mtouch->data = usb_buffer_alloc(udev, MTOUCHUSB_REPORT_DATA_SIZE,
 185                                         SLAB_ATOMIC, &mtouch->data_dma);
 186
 187         if (!mtouch->data)
 188                 return -1;
 189
 190         return 0;
 191 }
 192
 193 static void mtouchusb_free_buffers(struct usb_device *udev, struct mtouch_usb *mtouch)
 194 {
 195         dbg("%s - called", __FUNCTION__);
 196
 197         if (mtouch->data)
 198                 usb_buffer_free(udev, MTOUCHUSB_REPORT_DATA_SIZE,
 199                                 mtouch->data, mtouch->data_dma);
 200 }
 201
 202 static int mtouchusb_probe(struct usb_interface *intf, const struct usb_device_id *id)
 203 {
 204         struct mtouch_usb *mtouch;
 205         struct usb_host_interface *interface;
 206         struct usb_endpoint_descriptor *endpoint;
 207         struct usb_device *udev = interface_to_usbdev (intf);
 208         char path[64];
 209         int nRet;
 210
 211         dbg("%s - called", __FUNCTION__);
 212
 213         dbg("%s - setting interface", __FUNCTION__);
 214         interface = intf->cur_altsetting;
 215
 216         dbg("%s - setting endpoint", __FUNCTION__);
 217         endpoint = &interface->endpoint[0].desc;
 218
 219         if (!(mtouch = kmalloc (sizeof (struct mtouch_usb), GFP_KERNEL))) {
 220                 err("%s - Out of memory.", __FUNCTION__);
 221                 return -ENOMEM;
 222         }
 223
 224         memset(mtouch, 0, sizeof(struct mtouch_usb));
 225         mtouch->udev = udev;
 226
 227         dbg("%s - allocating buffers", __FUNCTION__);
 228         if (mtouchusb_alloc_buffers(udev, mtouch)) {
 229                 mtouchusb_free_buffers(udev, mtouch);
 230                 kfree(mtouch);
 231                 return -ENOMEM;
 232         }
 233
 234         mtouch->input.private = mtouch;
 235         mtouch->input.open = mtouchusb_open;
 236         mtouch->input.close = mtouchusb_close;
 237
 238         usb_make_path(udev, path, 64);
 239         sprintf(mtouch->phys, "%s/input0", path);
 240
 241         mtouch->input.name = mtouch->name;
 242         mtouch->input.phys = mtouch->phys;
 243         mtouch->input.id.bustype = BUS_USB;
 244         mtouch->input.id.vendor = le16_to_cpu(udev->descriptor.idVendor);
 245         mtouch->input.id.product = le16_to_cpu(udev->descriptor.idProduct);
 246         mtouch->input.id.version = le16_to_cpu(udev->descriptor.bcdDevice);
 247         mtouch->input.dev = &intf->dev;
 248
 249         mtouch->input.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 250         mtouch->input.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
 251         mtouch->input.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 252
 253         /* Used to Scale Compensated Data and Flip Y */
 254         mtouch->input.absmin[ABS_X] =  MTOUCHUSB_MIN_XC;
 255         mtouch->input.absmax[ABS_X] =  raw_coordinates ? \
 256                                        MTOUCHUSB_MAX_RAW_XC : MTOUCHUSB_MAX_CALIB_XC;
 257         mtouch->input.absfuzz[ABS_X] = MTOUCHUSB_XC_FUZZ;
 258         mtouch->input.absflat[ABS_X] = MTOUCHUSB_XC_FLAT;
 259         mtouch->input.absmin[ABS_Y] =  MTOUCHUSB_MIN_YC;
 260         mtouch->input.absmax[ABS_Y] =  raw_coordinates ? \
 261                                        MTOUCHUSB_MAX_RAW_YC : MTOUCHUSB_MAX_CALIB_YC;
 262         mtouch->input.absfuzz[ABS_Y] = MTOUCHUSB_YC_FUZZ;
 263         mtouch->input.absflat[ABS_Y] = MTOUCHUSB_YC_FLAT;
 264
 265         if (udev->manufacturer)
 266                 strcat(mtouch->name, udev->manufacturer);
 267         if (udev->product)
 268                 sprintf(mtouch->name, "%s %s", mtouch->name, udev->product);
 269
 270         if (!strlen(mtouch->name))
 271                 sprintf(mtouch->name, "USB Touchscreen %04x:%04x",
 272                         mtouch->input.id.vendor, mtouch->input.id.product);
 273
 274         nRet = usb_control_msg(mtouch->udev,
 275                                usb_rcvctrlpipe(udev, 0),
 276                                MTOUCHUSB_RESET,
 277                                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 278                                1,
 279                                0,
 280                                NULL,
 281                                0,
 282                                USB_CTRL_SET_TIMEOUT);
 283         dbg("%s - usb_control_msg - MTOUCHUSB_RESET - bytes|err: %d",
 284             __FUNCTION__, nRet);
 285
 286         dbg("%s - usb_alloc_urb: mtouch->irq", __FUNCTION__);
 287         mtouch->irq = usb_alloc_urb(0, GFP_KERNEL);
 288         if (!mtouch->irq) {
 289                 dbg("%s - usb_alloc_urb failed: mtouch->irq", __FUNCTION__);
 290                 mtouchusb_free_buffers(udev, mtouch);
 291                 kfree(mtouch);
 292                 return -ENOMEM;
 293         }
 294
 295         dbg("%s - usb_fill_int_urb", __FUNCTION__);
 296         usb_fill_int_urb(mtouch->irq,
 297                          mtouch->udev,
 298                          usb_rcvintpipe(mtouch->udev, 0x81),
 299                          mtouch->data,
 300                          MTOUCHUSB_REPORT_DATA_SIZE,
 301                          mtouchusb_irq,
 302                          mtouch,
 303                          endpoint->bInterval);
 304
 305         dbg("%s - input_register_device", __FUNCTION__);
 306         input_register_device(&mtouch->input);
 307
 308         nRet = usb_control_msg(mtouch->udev,
 309                                usb_rcvctrlpipe(udev, 0),
 310                                MTOUCHUSB_ASYNC_REPORT,
 311                                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 312                                1,
 313                                1,
 314                                NULL,
 315                                0,
 316                                USB_CTRL_SET_TIMEOUT);
 317         dbg("%s - usb_control_msg - MTOUCHUSB_ASYNC_REPORT - bytes|err: %d",
 318             __FUNCTION__, nRet);
 319
 320         printk(KERN_INFO "input: %s on %s\n", mtouch->name, path);
 321         usb_set_intfdata(intf, mtouch);
 322
 323         return 0;
 324 }
 325
 326 static void mtouchusb_disconnect(struct usb_interface *intf)
 327 {
 328         struct mtouch_usb *mtouch = usb_get_intfdata (intf);
 329
 330         dbg("%s - called", __FUNCTION__);
 331         usb_set_intfdata(intf, NULL);
 332         if (mtouch) {
 333                 dbg("%s - mtouch is initialized, cleaning up", __FUNCTION__);
 334                 usb_kill_urb(mtouch->irq);
 335                 input_unregister_device(&mtouch->input);
 336                 usb_free_urb(mtouch->irq);
 337                 mtouchusb_free_buffers(interface_to_usbdev(intf), mtouch);
 338                 kfree(mtouch);
 339         }
 340 }
 341
 342 MODULE_DEVICE_TABLE (usb, mtouchusb_devices);
 343
 344 static struct usb_driver mtouchusb_driver = {
 345         .owner =      THIS_MODULE,
 346         .name =       "mtouchusb",
 347         .probe =      mtouchusb_probe,
 348         .disconnect = mtouchusb_disconnect,
 349         .id_table =   mtouchusb_devices,
 350 };
 351
 352 static int __init mtouchusb_init(void) {
 353         dbg("%s - called", __FUNCTION__);
 354         return usb_register(&mtouchusb_driver);
 355 }
 356
 357 static void __exit mtouchusb_cleanup(void) {
 358         dbg("%s - called", __FUNCTION__);
 359         usb_deregister(&mtouchusb_driver);
 360 }
 361
 362 module_init(mtouchusb_init);
 363 module_exit(mtouchusb_cleanup);
 364
 365 MODULE_AUTHOR( DRIVER_AUTHOR );
 366 MODULE_DESCRIPTION( DRIVER_DESC );
 367 MODULE_LICENSE("GPL");