272 lines
7.6 KiB
C
272 lines
7.6 KiB
C
/******************************************************************************
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* itmtouch.c -- Driver for ITM touchscreen panel
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Based upon original work by Chris Collins <xfire-itmtouch@xware.cx>.
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*
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* Kudos to ITM for providing me with the datasheet for the panel,
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* even though it was a day later than I had finished writing this
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* driver.
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*
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* It has meant that I've been able to correct my interpretation of the
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* protocol packets however.
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*
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* CC -- 2003/9/29
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*
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* History
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* 1.0 & 1.1 2003 (CC) vojtech@suse.cz
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* Original version for 2.4.x kernels
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*
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* 1.2 02/03/2005 (HCE) hc@mivu.no
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* Complete rewrite to support Linux 2.6.10, thanks to mtouchusb.c for hints.
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* Unfortunately no calibration support at this time.
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*
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* 1.2.1 09/03/2005 (HCE) hc@mivu.no
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* Code cleanup and adjusting syntax to start matching kernel standards
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*
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* 1.2.2 10/05/2006 (MJA) massad@gmail.com
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* Flag for detecting if the screen was being touch was incorrectly
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* inverted, so no touch events were being detected.
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*
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*****************************************************************************/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/usb/input.h>
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/* only an 8 byte buffer necessary for a single packet */
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#define ITM_BUFSIZE 8
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#define PATH_SIZE 64
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#define USB_VENDOR_ID_ITMINC 0x0403
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#define USB_PRODUCT_ID_TOUCHPANEL 0xf9e9
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#define DRIVER_AUTHOR "Hans-Christian Egtvedt <hc@mivu.no>"
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#define DRIVER_VERSION "v1.2.2"
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#define DRIVER_DESC "USB ITM Inc Touch Panel Driver"
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#define DRIVER_LICENSE "GPL"
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MODULE_AUTHOR( DRIVER_AUTHOR );
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MODULE_DESCRIPTION( DRIVER_DESC );
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MODULE_LICENSE( DRIVER_LICENSE );
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struct itmtouch_dev {
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struct usb_device *usbdev; /* usb device */
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struct input_dev *inputdev; /* input device */
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struct urb *readurb; /* urb */
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char rbuf[ITM_BUFSIZE]; /* data */
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int users;
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char name[128];
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char phys[64];
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};
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static struct usb_device_id itmtouch_ids [] = {
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{ USB_DEVICE(USB_VENDOR_ID_ITMINC, USB_PRODUCT_ID_TOUCHPANEL) },
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{ }
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};
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static void itmtouch_irq(struct urb *urb)
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{
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struct itmtouch_dev *itmtouch = urb->context;
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unsigned char *data = urb->transfer_buffer;
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struct input_dev *dev = itmtouch->inputdev;
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int retval;
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switch (urb->status) {
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case 0:
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/* success */
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break;
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case -ETIME:
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/* this urb is timing out */
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dbg("%s - urb timed out - was the device unplugged?",
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__FUNCTION__);
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return;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d",
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__FUNCTION__, urb->status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d",
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__FUNCTION__, urb->status);
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goto exit;
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}
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/* if pressure has been released, then don't report X/Y */
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if (!(data[7] & 0x20)) {
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input_report_abs(dev, ABS_X, (data[0] & 0x1F) << 7 | (data[3] & 0x7F));
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input_report_abs(dev, ABS_Y, (data[1] & 0x1F) << 7 | (data[4] & 0x7F));
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}
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input_report_abs(dev, ABS_PRESSURE, (data[2] & 1) << 7 | (data[5] & 0x7F));
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input_report_key(dev, BTN_TOUCH, ~data[7] & 0x20);
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input_sync(dev);
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exit:
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retval = usb_submit_urb (urb, GFP_ATOMIC);
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if (retval)
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printk(KERN_ERR "%s - usb_submit_urb failed with result: %d",
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__FUNCTION__, retval);
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}
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static int itmtouch_open(struct input_dev *input)
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{
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struct itmtouch_dev *itmtouch = input->private;
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itmtouch->readurb->dev = itmtouch->usbdev;
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if (usb_submit_urb(itmtouch->readurb, GFP_KERNEL))
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return -EIO;
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return 0;
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}
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static void itmtouch_close(struct input_dev *input)
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{
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struct itmtouch_dev *itmtouch = input->private;
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usb_kill_urb(itmtouch->readurb);
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}
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static int itmtouch_probe(struct usb_interface *intf, const struct usb_device_id *id)
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{
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struct itmtouch_dev *itmtouch;
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struct input_dev *input_dev;
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struct usb_host_interface *interface;
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struct usb_endpoint_descriptor *endpoint;
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struct usb_device *udev = interface_to_usbdev(intf);
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unsigned int pipe;
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unsigned int maxp;
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interface = intf->cur_altsetting;
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endpoint = &interface->endpoint[0].desc;
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itmtouch = kzalloc(sizeof(struct itmtouch_dev), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!itmtouch || !input_dev) {
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err("%s - Out of memory.", __FUNCTION__);
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goto fail;
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}
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itmtouch->usbdev = udev;
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itmtouch->inputdev = input_dev;
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if (udev->manufacturer)
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strlcpy(itmtouch->name, udev->manufacturer, sizeof(itmtouch->name));
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if (udev->product) {
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if (udev->manufacturer)
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strlcat(itmtouch->name, " ", sizeof(itmtouch->name));
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strlcat(itmtouch->name, udev->product, sizeof(itmtouch->name));
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}
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if (!strlen(itmtouch->name))
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sprintf(itmtouch->name, "USB ITM touchscreen");
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usb_make_path(udev, itmtouch->phys, sizeof(itmtouch->phys));
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strlcpy(itmtouch->phys, "/input0", sizeof(itmtouch->phys));
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input_dev->name = itmtouch->name;
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input_dev->phys = itmtouch->phys;
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usb_to_input_id(udev, &input_dev->id);
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input_dev->cdev.dev = &intf->dev;
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input_dev->private = itmtouch;
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input_dev->open = itmtouch_open;
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input_dev->close = itmtouch_close;
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input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
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input_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
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input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
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/* device limits */
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/* as specified by the ITM datasheet, X and Y are 12bit,
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* Z (pressure) is 8 bit. However, the fields are defined up
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* to 14 bits for future possible expansion.
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*/
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input_set_abs_params(input_dev, ABS_X, 0, 0x0FFF, 2, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, 0x0FFF, 2, 0);
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input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xFF, 2, 0);
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/* initialise the URB so we can read from the transport stream */
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pipe = usb_rcvintpipe(itmtouch->usbdev, endpoint->bEndpointAddress);
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maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
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if (maxp > ITM_BUFSIZE)
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maxp = ITM_BUFSIZE;
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itmtouch->readurb = usb_alloc_urb(0, GFP_KERNEL);
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if (!itmtouch->readurb) {
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dbg("%s - usb_alloc_urb failed: itmtouch->readurb", __FUNCTION__);
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goto fail;
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}
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usb_fill_int_urb(itmtouch->readurb, itmtouch->usbdev, pipe, itmtouch->rbuf,
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maxp, itmtouch_irq, itmtouch, endpoint->bInterval);
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input_register_device(itmtouch->inputdev);
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usb_set_intfdata(intf, itmtouch);
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return 0;
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fail: input_free_device(input_dev);
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kfree(itmtouch);
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return -ENOMEM;
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}
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static void itmtouch_disconnect(struct usb_interface *intf)
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{
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struct itmtouch_dev *itmtouch = usb_get_intfdata(intf);
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usb_set_intfdata(intf, NULL);
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if (itmtouch) {
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input_unregister_device(itmtouch->inputdev);
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usb_kill_urb(itmtouch->readurb);
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usb_free_urb(itmtouch->readurb);
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kfree(itmtouch);
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}
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}
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MODULE_DEVICE_TABLE(usb, itmtouch_ids);
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static struct usb_driver itmtouch_driver = {
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.name = "itmtouch",
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.probe = itmtouch_probe,
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.disconnect = itmtouch_disconnect,
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.id_table = itmtouch_ids,
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};
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static int __init itmtouch_init(void)
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{
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info(DRIVER_DESC " " DRIVER_VERSION);
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info(DRIVER_AUTHOR);
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return usb_register(&itmtouch_driver);
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}
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static void __exit itmtouch_exit(void)
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{
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usb_deregister(&itmtouch_driver);
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}
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module_init(itmtouch_init);
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module_exit(itmtouch_exit);
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