Input: Add driver for ITM Touch USB touchscreens.
authorHans-Christian Egtvedt <hc@mivu.no>
Sun, 29 May 2005 07:27:45 +0000 (02:27 -0500)
committerDmitry Torokhov <dtor_core@ameritech.net>
Sun, 29 May 2005 07:27:45 +0000 (02:27 -0500)
From: Hans-Christian Egtvedt <hc@mivu.no>
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
drivers/usb/input/Kconfig
drivers/usb/input/Makefile
drivers/usb/input/itmtouch.c [new file with mode: 0644]

index d28e7eab6f981804a345b4afc14349339c35e2e0..fcae574f310666d737a4eb171c90d8d0a326f973 100644 (file)
@@ -190,6 +190,18 @@ config USB_MTOUCH
          To compile this driver as a module, choose M here: the
          module will be called mtouchusb.
 
+config USB_ITMTOUCH
+       tristate "ITM Touch USB Touchscreen Driver"
+       depends on USB && INPUT
+       ---help---
+         Say Y here if you want to use a ITM Touch USB
+         Touchscreen controller.
+
+         This touchscreen is used in LG 1510SF monitors.
+
+         To compile this driver as a module, choose M here: the
+         module will be called itmtouch.
+
 config USB_EGALAX
        tristate "eGalax TouchKit USB Touchscreen Driver"
        depends on USB && INPUT
index 6bcedd16b0a1812a44c65bf7a37c7d1e17425e31..f0fd02e00d329b431b3952b5640a2ee24e642c92 100644 (file)
@@ -33,6 +33,7 @@ obj-$(CONFIG_USB_KBD)         += usbkbd.o
 obj-$(CONFIG_USB_KBTAB)                += kbtab.o
 obj-$(CONFIG_USB_MOUSE)                += usbmouse.o
 obj-$(CONFIG_USB_MTOUCH)       += mtouchusb.o
+obj-$(CONFIG_USB_ITMTOUCH)     += itmtouch.o
 obj-$(CONFIG_USB_EGALAX)       += touchkitusb.o
 obj-$(CONFIG_USB_POWERMATE)    += powermate.o
 obj-$(CONFIG_USB_WACOM)                += wacom.o
diff --git a/drivers/usb/input/itmtouch.c b/drivers/usb/input/itmtouch.c
new file mode 100644 (file)
index 0000000..4c27c10
--- /dev/null
@@ -0,0 +1,281 @@
+/******************************************************************************
+ * itmtouch.c  --  Driver for ITM touchscreen panel
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Based upon original work by Chris Collins <xfire-itmtouch@xware.cx>.
+ *
+ * Kudos to ITM for providing me with the datasheet for the panel,
+ * even though it was a day later than I had finished writing this 
+ * driver.
+ * 
+ * It has meant that I've been able to correct my interpretation of the
+ * protocol packets however.
+ * 
+ * CC -- 2003/9/29
+ * 
+ * History
+ * 1.0 & 1.1  2003 (CC) vojtech@suse.cz
+ *   Original version for 2.4.x kernels
+ *
+ * 1.2  02/03/2005 (HCE) hc@mivu.no
+ *   Complete rewrite to support Linux 2.6.10, thanks to mtouchusb.c for hints.
+ *   Unfortunately no calibration support at this time.
+ * 
+ * 1.2.1  09/03/2005 (HCE) hc@mivu.no
+ *   Code cleanup and adjusting syntax to start matching kernel standards
+ * 
+ *****************************************************************************/
+
+#include <linux/config.h>
+
+#ifdef CONFIG_USB_DEBUG
+       #define DEBUG
+#else
+       #undef DEBUG
+#endif
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/usb.h>
+
+/* only an 8 byte buffer necessary for a single packet */
+#define ITM_BUFSIZE                    8
+#define PATH_SIZE                      64
+
+#define USB_VENDOR_ID_ITMINC           0x0403
+#define USB_PRODUCT_ID_TOUCHPANEL      0xf9e9
+
+#define DRIVER_AUTHOR "Hans-Christian Egtvedt <hc@mivu.no>"
+#define DRIVER_VERSION "v1.2.1"
+#define DRIVER_DESC "USB ITM Inc Touch Panel Driver"
+#define DRIVER_LICENSE "GPL"
+
+MODULE_AUTHOR( DRIVER_AUTHOR );
+MODULE_DESCRIPTION( DRIVER_DESC );
+MODULE_LICENSE( DRIVER_LICENSE );
+
+struct itmtouch_dev {
+       struct usb_device       *usbdev; /* usb device */
+       struct input_dev        inputdev; /* input device */
+       struct urb              *readurb; /* urb */
+       char                    rbuf[ITM_BUFSIZE]; /* data */
+       int                     users;
+       char name[128];
+       char phys[64];
+};
+
+static struct usb_device_id itmtouch_ids [] = {
+       { USB_DEVICE(USB_VENDOR_ID_ITMINC, USB_PRODUCT_ID_TOUCHPANEL) },
+       { }
+};
+
+static void itmtouch_irq(struct urb *urb, struct pt_regs *regs)
+{
+       struct itmtouch_dev * itmtouch = urb->context;
+       unsigned char *data = urb->transfer_buffer;
+       struct input_dev *dev = &itmtouch->inputdev;
+       int retval;
+
+       switch (urb->status) {
+       case 0:
+               /* success */
+               break;
+       case -ETIMEDOUT:
+               /* this urb is timing out */
+               dbg("%s - urb timed out - was the device unplugged?",
+                   __FUNCTION__);
+               return;
+       case -ECONNRESET:
+       case -ENOENT:
+       case -ESHUTDOWN:
+               /* this urb is terminated, clean up */
+               dbg("%s - urb shutting down with status: %d",
+                   __FUNCTION__, urb->status);
+               return;
+       default:
+               dbg("%s - nonzero urb status received: %d",
+                   __FUNCTION__, urb->status);
+               goto exit;
+       }
+
+       input_regs(dev, regs);
+
+       /* if pressure has been released, then don't report X/Y */
+       if (data[7] & 0x20) {
+               input_report_abs(dev, ABS_X, (data[0] & 0x1F) << 7 | (data[3] & 0x7F));
+               input_report_abs(dev, ABS_Y, (data[1] & 0x1F) << 7 | (data[4] & 0x7F));
+       }
+       
+       input_report_abs(dev, ABS_PRESSURE, (data[2] & 1) << 7 | (data[5] & 0x7F));
+       input_report_key(dev, BTN_TOUCH, ~data[7] & 0x20);
+       input_sync(dev);
+
+exit:
+       retval = usb_submit_urb (urb, GFP_ATOMIC);
+       if (retval)
+               printk(KERN_ERR "%s - usb_submit_urb failed with result: %d",
+                               __FUNCTION__, retval);
+}
+
+static int itmtouch_open(struct input_dev *input)
+{
+       struct itmtouch_dev *itmtouch = input->private;
+
+       if (itmtouch->users++)
+               return 0;
+
+       itmtouch->readurb->dev = itmtouch->usbdev;
+
+       if (usb_submit_urb(itmtouch->readurb, GFP_KERNEL))
+       {
+               itmtouch->users--;
+               return -EIO;
+       }
+
+       return 0;
+}
+
+static void itmtouch_close(struct input_dev *input)
+{
+       struct itmtouch_dev *itmtouch = input->private;
+
+       if (!--itmtouch->users)
+               usb_kill_urb(itmtouch->readurb);
+}
+
+static int itmtouch_probe(struct usb_interface *intf, const struct usb_device_id *id)
+{
+       struct itmtouch_dev *itmtouch;
+       struct usb_host_interface *interface;
+       struct usb_endpoint_descriptor *endpoint;
+       struct usb_device *udev = interface_to_usbdev(intf);
+       unsigned int pipe;
+       unsigned int maxp;
+       char path[PATH_SIZE];
+
+       interface = intf->cur_altsetting;
+       endpoint = &interface->endpoint[0].desc;
+
+       if (!(itmtouch = kcalloc(1, sizeof(struct itmtouch_dev), GFP_KERNEL))) {
+               err("%s - Out of memory.", __FUNCTION__);
+               return -ENOMEM;
+       }
+
+       itmtouch->usbdev = udev;
+       
+       itmtouch->inputdev.private = itmtouch;
+       itmtouch->inputdev.open = itmtouch_open;
+       itmtouch->inputdev.close = itmtouch_close;
+
+       usb_make_path(udev, path, PATH_SIZE);
+       
+       itmtouch->inputdev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+       itmtouch->inputdev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
+       itmtouch->inputdev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+
+       itmtouch->inputdev.name = itmtouch->name;
+       itmtouch->inputdev.phys = itmtouch->phys;
+       itmtouch->inputdev.id.bustype = BUS_USB;
+       itmtouch->inputdev.id.vendor = udev->descriptor.idVendor;
+       itmtouch->inputdev.id.product = udev->descriptor.idProduct;
+       itmtouch->inputdev.id.version = udev->descriptor.bcdDevice;     
+       itmtouch->inputdev.dev = &intf->dev;
+
+       if (!strlen(itmtouch->name))
+               sprintf(itmtouch->name, "USB ITM touchscreen");
+       
+       /* device limits */
+       /* as specified by the ITM datasheet, X and Y are 12bit,
+        * Z (pressure) is 8 bit. However, the fields are defined up
+        * to 14 bits for future possible expansion.
+        */
+       input_set_abs_params(&itmtouch->inputdev, ABS_X, 0, 0x0FFF, 2, 0);
+       input_set_abs_params(&itmtouch->inputdev, ABS_Y, 0, 0x0FFF, 2, 0);
+       input_set_abs_params(&itmtouch->inputdev, ABS_PRESSURE, 0, 0xFF, 2, 0);
+
+       /* initialise the URB so we can read from the transport stream */
+       pipe = usb_rcvintpipe(itmtouch->usbdev, endpoint->bEndpointAddress);
+       maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
+       
+       if (maxp > ITM_BUFSIZE)
+               maxp = ITM_BUFSIZE;
+
+       itmtouch->readurb = usb_alloc_urb(0, GFP_KERNEL);
+       
+       if (!itmtouch->readurb) {
+               dbg("%s - usb_alloc_urb failed: itmtouch->readurb", __FUNCTION__);
+               kfree(itmtouch);
+               return -ENOMEM;
+       }
+       
+       usb_fill_int_urb(itmtouch->readurb,
+                       itmtouch->usbdev,
+                       pipe,
+                       itmtouch->rbuf, 
+                       maxp,
+                       itmtouch_irq,
+                       itmtouch,
+                       endpoint->bInterval);
+
+       input_register_device(&itmtouch->inputdev);
+
+       printk(KERN_INFO "itmtouch: %s registered on %s\n", itmtouch->name, path);
+       usb_set_intfdata(intf, itmtouch);
+
+       return 0;
+}
+
+static void itmtouch_disconnect(struct usb_interface *intf)
+{      
+       struct itmtouch_dev *itmtouch = usb_get_intfdata(intf);
+
+       usb_set_intfdata(intf, NULL);
+
+       if (itmtouch) {
+               input_unregister_device(&itmtouch->inputdev);
+               usb_kill_urb(itmtouch->readurb);
+               usb_free_urb(itmtouch->readurb);
+               kfree(itmtouch);
+       }
+}
+
+MODULE_DEVICE_TABLE(usb, itmtouch_ids);
+
+static struct usb_driver itmtouch_driver = {
+               .owner =        THIS_MODULE,
+               .name =         "itmtouch",
+               .probe =        itmtouch_probe,
+               .disconnect =   itmtouch_disconnect,
+               .id_table =     itmtouch_ids,
+};
+
+static int __init itmtouch_init(void)
+{
+       info(DRIVER_DESC " " DRIVER_VERSION);
+       info(DRIVER_AUTHOR);
+       return usb_register(&itmtouch_driver);
+}
+
+static void __exit itmtouch_exit(void)
+{
+       usb_deregister(&itmtouch_driver);
+}
+
+module_init(itmtouch_init);
+module_exit(itmtouch_exit);