[PATCH] add support for eGalax Touchscreen USB
From: Daniel Ritz
Date: Mon May 03 2004 - 14:33:23 EST
hi
this is the second version of the patch to add support for eGalax Touchkit USB
touchscreen. changes since last patch:
- fixed the bug in open, found by oliver neukum
- renamed driver from touchkit.c to touchkitusb.c (since the thing also exists
as RS232, PS/2 and I2C)
- some minor coding style updates
against 2.6.6-rc3-bk.
greg, feel free to apply it :)
rgds
-daniel
--- 1.18/drivers/usb/input/Makefile Mon Mar 22 15:32:15 2004
+++ edited/drivers/usb/input/Makefile Sun Apr 25 16:18:58 2004
@@ -33,6 +33,7 @@
obj-$(CONFIG_USB_KBTAB) += kbtab.o
obj-$(CONFIG_USB_MOUSE) += usbmouse.o
obj-$(CONFIG_USB_MTOUCH) += mtouchusb.o
+obj-$(CONFIG_USB_EGALAX) += touchkitusb.o
obj-$(CONFIG_USB_POWERMATE) += powermate.o
obj-$(CONFIG_USB_WACOM) += wacom.o
obj-$(CONFIG_USB_XPAD) += xpad.o
--- 1.14/drivers/usb/input/Kconfig Mon Mar 22 15:42:37 2004
+++ edited/drivers/usb/input/Kconfig Sat May 1 17:40:50 2004
@@ -191,6 +191,19 @@
To compile this driver as a module, choose M here: the
module will be called mtouchusb.
+config USB_EGALAX
+ tristate "eGalax TouchKit USB Touchscreen Driver"
+ depends on USB && INPUT
+ ---help---
+ Say Y here if you want to use a eGalax TouchKit USB
+ Touchscreen controller.
+
+ The driver has been tested on a Xenarc 700TSV monitor
+ with eGalax touchscreen.
+
+ To compile this driver as a module, choose M here: the
+ module will be called touchkitusb.
+
config USB_XPAD
tristate "X-Box gamepad support"
depends on USB && INPUT
--- /dev/null 1998-05-05 22:32:27.000000000 +0200
+++ linux-2.6/drivers/usb/input/touchkitusb.c 2004-05-02 16:32:32.000000000 +0200
@@ -0,0 +1,310 @@
+/******************************************************************************
+ * touchkitusb.c -- Driver for eGalax TouchKit USB Touchscreens
+ *
+ * Copyright (C) 2004 by Daniel Ritz
+ * Copyright (C) by Todd E. Johnson (mtouchusb.c)
+ *
+ * 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 mtouchusb.c
+ *
+ *****************************************************************************/
+
+//#define DEBUG
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+#if !defined(DEBUG) && defined(CONFIG_USB_DEBUG)
+#define DEBUG
+#endif
+#include <linux/usb.h>
+
+
+#define TOUCHKIT_MIN_XC 0x0
+#define TOUCHKIT_MAX_XC 0x07ff
+#define TOUCHKIT_XC_FUZZ 0x0
+#define TOUCHKIT_XC_FLAT 0x0
+#define TOUCHKIT_MIN_YC 0x0
+#define TOUCHKIT_MAX_YC 0x07ff
+#define TOUCHKIT_YC_FUZZ 0x0
+#define TOUCHKIT_YC_FLAT 0x0
+#define TOUCHKIT_REPORT_DATA_SIZE 8
+
+#define TOUCHKIT_DOWN 0x01
+#define TOUCHKIT_POINT_TOUCH 0x81
+#define TOUCHKIT_POINT_NOTOUCH 0x80
+
+#define TOUCHKIT_GET_TOUCHED(dat) ((((dat)[0]) & TOUCHKIT_DOWN) ? 1 : 0)
+#define TOUCHKIT_GET_X(dat) (((dat)[3] << 7) | (dat)[4])
+#define TOUCHKIT_GET_Y(dat) (((dat)[1] << 7) | (dat)[2])
+
+#define DRIVER_VERSION "v0.1"
+#define DRIVER_AUTHOR "Daniel Ritz <daniel.ritz@xxxxxx>"
+#define DRIVER_DESC "eGalax TouchKit USB HID Touchscreen Driver"
+
+struct touchkit_usb {
+ unsigned char *data;
+ dma_addr_t data_dma;
+ struct urb *irq;
+ struct usb_device *udev;
+ struct input_dev input;
+ int open;
+ char name[128];
+ char phys[64];
+};
+
+static struct usb_device_id touchkit_devices[] = {
+ {USB_DEVICE(0x3823, 0x0001)},
+ {USB_DEVICE(0x0eef, 0x0001)},
+ {}
+};
+
+static void touchkit_irq(struct urb *urb, struct pt_regs *regs)
+{
+ struct touchkit_usb *touchkit = urb->context;
+ 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(&touchkit->input, regs);
+ input_report_key(&touchkit->input, BTN_TOUCH,
+ TOUCHKIT_GET_TOUCHED(touchkit->data));
+ input_report_abs(&touchkit->input, ABS_X,
+ TOUCHKIT_GET_X(touchkit->data));
+ input_report_abs(&touchkit->input, ABS_Y,
+ TOUCHKIT_GET_Y(touchkit->data));
+ input_sync(&touchkit->input);
+
+exit:
+ retval = usb_submit_urb(urb, GFP_ATOMIC);
+ if (retval)
+ err("%s - usb_submit_urb failed with result: %d",
+ __FUNCTION__, retval);
+}
+
+static int touchkit_open(struct input_dev *input)
+{
+ struct touchkit_usb *touchkit = input->private;
+
+ if (touchkit->open++)
+ return 0;
+
+ touchkit->irq->dev = touchkit->udev;
+
+ if (usb_submit_urb(touchkit->irq, GFP_ATOMIC)) {
+ touchkit->open--;
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static void touchkit_close(struct input_dev *input)
+{
+ struct touchkit_usb *touchkit = input->private;
+
+ if (!--touchkit->open)
+ usb_unlink_urb(touchkit->irq);
+}
+
+static int touchkit_alloc_buffers(struct usb_device *udev,
+ struct touchkit_usb *touchkit)
+{
+ touchkit->data = usb_buffer_alloc(udev, TOUCHKIT_REPORT_DATA_SIZE,
+ SLAB_ATOMIC, &touchkit->data_dma);
+
+ if (!touchkit->data)
+ return -1;
+
+ return 0;
+}
+
+static void touchkit_free_buffers(struct usb_device *udev,
+ struct touchkit_usb *touchkit)
+{
+ if (touchkit->data)
+ usb_buffer_free(udev, TOUCHKIT_REPORT_DATA_SIZE,
+ touchkit->data, touchkit->data_dma);
+}
+
+static int touchkit_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ int ret;
+ struct touchkit_usb *touchkit;
+ struct usb_host_interface *interface;
+ struct usb_endpoint_descriptor *endpoint;
+ struct usb_device *udev = interface_to_usbdev(intf);
+ char path[64];
+ char *buf;
+
+ interface = intf->cur_altsetting;
+ endpoint = &interface->endpoint[0].desc;
+
+ touchkit = kmalloc(sizeof(struct touchkit_usb), GFP_KERNEL);
+ if (!touchkit)
+ return -ENOMEM;
+
+ memset(touchkit, 0, sizeof(struct touchkit_usb));
+ touchkit->udev = udev;
+
+ if (touchkit_alloc_buffers(udev, touchkit)) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ touchkit->input.private = touchkit;
+ touchkit->input.open = touchkit_open;
+ touchkit->input.close = touchkit_close;
+
+ usb_make_path(udev, path, 64);
+ sprintf(touchkit->phys, "%s/input0", path);
+
+ touchkit->input.name = touchkit->name;
+ touchkit->input.phys = touchkit->phys;
+ touchkit->input.id.bustype = BUS_USB;
+ touchkit->input.id.vendor = udev->descriptor.idVendor;
+ touchkit->input.id.product = udev->descriptor.idProduct;
+ touchkit->input.id.version = udev->descriptor.bcdDevice;
+ touchkit->input.dev = &intf->dev;
+
+ touchkit->input.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+ touchkit->input.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
+ touchkit->input.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+
+ /* Used to Scale Compensated Data */
+ touchkit->input.absmin[ABS_X] = TOUCHKIT_MIN_XC;
+ touchkit->input.absmax[ABS_X] = TOUCHKIT_MAX_XC;
+ touchkit->input.absfuzz[ABS_X] = TOUCHKIT_XC_FUZZ;
+ touchkit->input.absflat[ABS_X] = TOUCHKIT_XC_FLAT;
+ touchkit->input.absmin[ABS_Y] = TOUCHKIT_MIN_YC;
+ touchkit->input.absmax[ABS_Y] = TOUCHKIT_MAX_YC;
+ touchkit->input.absfuzz[ABS_Y] = TOUCHKIT_YC_FUZZ;
+ touchkit->input.absflat[ABS_Y] = TOUCHKIT_YC_FLAT;
+
+ buf = kmalloc(63, GFP_KERNEL);
+ if (!buf) {
+ ret = -ENOMEM;
+ goto out_free_buffers;
+ }
+
+ if (udev->descriptor.iManufacturer &&
+ usb_string(udev, udev->descriptor.iManufacturer, buf, 63) > 0)
+ strcat(touchkit->name, buf);
+ if (udev->descriptor.iProduct &&
+ usb_string(udev, udev->descriptor.iProduct, buf, 63) > 0)
+ sprintf(touchkit->name, "%s %s", touchkit->name, buf);
+
+ if (!strlen(touchkit->name))
+ sprintf(touchkit->name, "USB Touchscreen %04x:%04x",
+ touchkit->input.id.vendor, touchkit->input.id.product);
+
+ kfree(buf);
+
+ touchkit->irq = usb_alloc_urb(0, GFP_KERNEL);
+ if (!touchkit->irq) {
+ dbg("%s - usb_alloc_urb failed: touchkit->irq", __FUNCTION__);
+ ret = -ENOMEM;
+ goto out_free_buffers;
+ }
+
+ usb_fill_int_urb(touchkit->irq, touchkit->udev,
+ usb_rcvintpipe(touchkit->udev, 0x81),
+ touchkit->data, TOUCHKIT_REPORT_DATA_SIZE,
+ touchkit_irq, touchkit, endpoint->bInterval);
+
+ input_register_device(&touchkit->input);
+
+ printk(KERN_INFO "input: %s on %s\n", touchkit->name, path);
+ usb_set_intfdata(intf, touchkit);
+
+ return 0;
+
+out_free_buffers:
+ touchkit_free_buffers(udev, touchkit);
+out_free:
+ kfree(touchkit);
+ return ret;
+}
+
+static void touchkit_disconnect(struct usb_interface *intf)
+{
+ struct touchkit_usb *touchkit = usb_get_intfdata(intf);
+
+ dbg("%s - called", __FUNCTION__);
+
+ if (!touchkit)
+ return;
+
+ dbg("%s - touchkit is initialized, cleaning up", __FUNCTION__);
+ usb_set_intfdata(intf, NULL);
+ input_unregister_device(&touchkit->input);
+ usb_unlink_urb(touchkit->irq);
+ usb_free_urb(touchkit->irq);
+ touchkit_free_buffers(interface_to_usbdev(intf), touchkit);
+ kfree(touchkit);
+}
+
+MODULE_DEVICE_TABLE(usb, touchkit_devices);
+
+static struct usb_driver touchkit_driver = {
+ .owner = THIS_MODULE,
+ .name = "touchkitusb",
+ .probe = touchkit_probe,
+ .disconnect = touchkit_disconnect,
+ .id_table = touchkit_devices,
+};
+
+static int __init touchkit_init(void)
+{
+ return usb_register(&touchkit_driver);
+}
+
+static void __exit touchkit_cleanup(void)
+{
+ usb_deregister(&touchkit_driver);
+}
+
+module_init(touchkit_init);
+module_exit(touchkit_cleanup);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
-
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