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   1 /******************************************************************************
   2  * itmtouch.c  --  Driver for ITM touchscreen panel
   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 Chris Collins <xfire-itmtouch@xware.cx>.
  19  *
  20  * Kudos to ITM for providing me with the datasheet for the panel,
  21  * even though it was a day later than I had finished writing this
  22  * driver.
  23  *
  24  * It has meant that I've been able to correct my interpretation of the
  25  * protocol packets however.
  26  *
  27  * CC -- 2003/9/29
  28  *
  29  * History
  30  * 1.0 & 1.1  2003 (CC) vojtech@suse.cz
  31  *   Original version for 2.4.x kernels
  32  *
  33  * 1.2  02/03/2005 (HCE) hc@mivu.no
  34  *   Complete rewrite to support Linux 2.6.10, thanks to mtouchusb.c for hints.
  35  *   Unfortunately no calibration support at this time.
  36  *
  37  * 1.2.1  09/03/2005 (HCE) hc@mivu.no
  38  *   Code cleanup and adjusting syntax to start matching kernel standards
  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 #include <linux/usb_input.h>
  57
  58 /* only an 8 byte buffer necessary for a single packet */
  59 #define ITM_BUFSIZE                     8
  60 #define PATH_SIZE                       64
  61
  62 #define USB_VENDOR_ID_ITMINC            0x0403
  63 #define USB_PRODUCT_ID_TOUCHPANEL       0xf9e9
  64
  65 #define DRIVER_AUTHOR "Hans-Christian Egtvedt <hc@mivu.no>"
  66 #define DRIVER_VERSION "v1.2.1"
  67 #define DRIVER_DESC "USB ITM Inc Touch Panel Driver"
  68 #define DRIVER_LICENSE "GPL"
  69
  70 MODULE_AUTHOR( DRIVER_AUTHOR );
  71 MODULE_DESCRIPTION( DRIVER_DESC );
  72 MODULE_LICENSE( DRIVER_LICENSE );
  73
  74 struct itmtouch_dev {
  75         struct usb_device       *usbdev; /* usb device */
  76         struct input_dev        *inputdev; /* input device */
  77         struct urb              *readurb; /* urb */
  78         char                    rbuf[ITM_BUFSIZE]; /* data */
  79         int                     users;
  80         char name[128];
  81         char phys[64];
  82 };
  83
  84 static struct usb_device_id itmtouch_ids [] = {
  85         { USB_DEVICE(USB_VENDOR_ID_ITMINC, USB_PRODUCT_ID_TOUCHPANEL) },
  86         { }
  87 };
  88
  89 static void itmtouch_irq(struct urb *urb, struct pt_regs *regs)
  90 {
  91         struct itmtouch_dev *itmtouch = urb->context;
  92         unsigned char *data = urb->transfer_buffer;
  93         struct input_dev *dev = itmtouch->inputdev;
  94         int retval;
  95
  96         switch (urb->status) {
  97         case 0:
  98                 /* success */
  99                 break;
 100         case -ETIMEDOUT:
 101                 /* this urb is timing out */
 102                 dbg("%s - urb timed out - was the device unplugged?",
 103                     __FUNCTION__);
 104                 return;
 105         case -ECONNRESET:
 106         case -ENOENT:
 107         case -ESHUTDOWN:
 108                 /* this urb is terminated, clean up */
 109                 dbg("%s - urb shutting down with status: %d",
 110                     __FUNCTION__, urb->status);
 111                 return;
 112         default:
 113                 dbg("%s - nonzero urb status received: %d",
 114                     __FUNCTION__, urb->status);
 115                 goto exit;
 116         }
 117
 118         input_regs(dev, regs);
 119
 120         /* if pressure has been released, then don't report X/Y */
 121         if (data[7] & 0x20) {
 122                 input_report_abs(dev, ABS_X, (data[0] & 0x1F) << 7 | (data[3] & 0x7F));
 123                 input_report_abs(dev, ABS_Y, (data[1] & 0x1F) << 7 | (data[4] & 0x7F));
 124         }
 125
 126         input_report_abs(dev, ABS_PRESSURE, (data[2] & 1) << 7 | (data[5] & 0x7F));
 127         input_report_key(dev, BTN_TOUCH, ~data[7] & 0x20);
 128         input_sync(dev);
 129
 130 exit:
 131         retval = usb_submit_urb (urb, GFP_ATOMIC);
 132         if (retval)
 133                 printk(KERN_ERR "%s - usb_submit_urb failed with result: %d",
 134                                 __FUNCTION__, retval);
 135 }
 136
 137 static int itmtouch_open(struct input_dev *input)
 138 {
 139         struct itmtouch_dev *itmtouch = input->private;
 140
 141         itmtouch->readurb->dev = itmtouch->usbdev;
 142
 143         if (usb_submit_urb(itmtouch->readurb, GFP_KERNEL))
 144                 return -EIO;
 145
 146         return 0;
 147 }
 148
 149 static void itmtouch_close(struct input_dev *input)
 150 {
 151         struct itmtouch_dev *itmtouch = input->private;
 152
 153         usb_kill_urb(itmtouch->readurb);
 154 }
 155
 156 static int itmtouch_probe(struct usb_interface *intf, const struct usb_device_id *id)
 157 {
 158         struct itmtouch_dev *itmtouch;
 159         struct input_dev *input_dev;
 160         struct usb_host_interface *interface;
 161         struct usb_endpoint_descriptor *endpoint;
 162         struct usb_device *udev = interface_to_usbdev(intf);
 163         unsigned int pipe;
 164         unsigned int maxp;
 165
 166         interface = intf->cur_altsetting;
 167         endpoint = &interface->endpoint[0].desc;
 168
 169         itmtouch = kzalloc(sizeof(struct itmtouch_dev), GFP_KERNEL);
 170         input_dev = input_allocate_device();
 171         if (!itmtouch || !input_dev) {
 172                 err("%s - Out of memory.", __FUNCTION__);
 173                 goto fail;
 174         }
 175
 176         itmtouch->usbdev = udev;
 177         itmtouch->inputdev = input_dev;
 178
 179         if (udev->manufacturer)
 180                 strlcpy(itmtouch->name, udev->manufacturer, sizeof(itmtouch->name));
 181
 182         if (udev->product) {
 183                 if (udev->manufacturer)
 184                         strlcat(itmtouch->name, " ", sizeof(itmtouch->name));
 185                 strlcat(itmtouch->name, udev->product, sizeof(itmtouch->name));
 186         }
 187
 188         if (!strlen(itmtouch->name))
 189                 sprintf(itmtouch->name, "USB ITM touchscreen");
 190
 191         usb_make_path(udev, itmtouch->phys, sizeof(itmtouch->phys));
 192         strlcpy(itmtouch->phys, "/input0", sizeof(itmtouch->phys));
 193
 194         input_dev->name = itmtouch->name;
 195         input_dev->phys = itmtouch->phys;
 196         usb_to_input_id(udev, &input_dev->id);
 197         input_dev->cdev.dev = &intf->dev;
 198         input_dev->private = itmtouch;
 199
 200         input_dev->open = itmtouch_open;
 201         input_dev->close = itmtouch_close;
 202
 203         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 204         input_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
 205         input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 206
 207         /* device limits */
 208         /* as specified by the ITM datasheet, X and Y are 12bit,
 209          * Z (pressure) is 8 bit. However, the fields are defined up
 210          * to 14 bits for future possible expansion.
 211          */
 212         input_set_abs_params(input_dev, ABS_X, 0, 0x0FFF, 2, 0);
 213         input_set_abs_params(input_dev, ABS_Y, 0, 0x0FFF, 2, 0);
 214         input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xFF, 2, 0);
 215
 216         /* initialise the URB so we can read from the transport stream */
 217         pipe = usb_rcvintpipe(itmtouch->usbdev, endpoint->bEndpointAddress);
 218         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
 219
 220         if (maxp > ITM_BUFSIZE)
 221                 maxp = ITM_BUFSIZE;
 222
 223         itmtouch->readurb = usb_alloc_urb(0, GFP_KERNEL);
 224         if (!itmtouch->readurb) {
 225                 dbg("%s - usb_alloc_urb failed: itmtouch->readurb", __FUNCTION__);
 226                 goto fail;
 227         }
 228
 229         usb_fill_int_urb(itmtouch->readurb, itmtouch->usbdev, pipe, itmtouch->rbuf,
 230                          maxp, itmtouch_irq, itmtouch, endpoint->bInterval);
 231
 232         input_register_device(itmtouch->inputdev);
 233
 234         usb_set_intfdata(intf, itmtouch);
 235
 236         return 0;
 237
 238  fail:  input_free_device(input_dev);
 239         kfree(itmtouch);
 240         return -ENOMEM;
 241 }
 242
 243 static void itmtouch_disconnect(struct usb_interface *intf)
 244 {
 245         struct itmtouch_dev *itmtouch = usb_get_intfdata(intf);
 246
 247         usb_set_intfdata(intf, NULL);
 248
 249         if (itmtouch) {
 250                 input_unregister_device(itmtouch->inputdev);
 251                 usb_kill_urb(itmtouch->readurb);
 252                 usb_free_urb(itmtouch->readurb);
 253                 kfree(itmtouch);
 254         }
 255 }
 256
 257 MODULE_DEVICE_TABLE(usb, itmtouch_ids);
 258
 259 static struct usb_driver itmtouch_driver = {
 260         .owner =        THIS_MODULE,
 261         .name =         "itmtouch",
 262         .probe =        itmtouch_probe,
 263         .disconnect =   itmtouch_disconnect,
 264         .id_table =     itmtouch_ids,
 265 };
 266
 267 static int __init itmtouch_init(void)
 268 {
 269         info(DRIVER_DESC " " DRIVER_VERSION);
 270         info(DRIVER_AUTHOR);
 271         return usb_register(&itmtouch_driver);
 272 }
 273
 274 static void __exit itmtouch_exit(void)
 275 {
 276         usb_deregister(&itmtouch_driver);
 277 }
 278
 279 module_init(itmtouch_init);
 280 module_exit(itmtouch_exit);