summaryrefslogtreecommitdiff
path: root/drivers/usb/input/itmtouch.c
blob: f3e3080de5b5208a54299baedc0489bfc6090cea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
/******************************************************************************
 * 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
 * 
 * 1.2.2  10/05/2006 (MJA) massad@gmail.com
 *   Flag for detecting if the screen was being touch was incorrectly 
 *   inverted, so no touch events were being detected. 	
 *   
 *****************************************************************************/

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.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 "v1.2.2"
#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 -ETIME:
		/* 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;

	itmtouch->readurb->dev = itmtouch->usbdev;

	if (usb_submit_urb(itmtouch->readurb, GFP_KERNEL))
		return -EIO;

	return 0;
}

static void itmtouch_close(struct input_dev *input)
{
	struct itmtouch_dev *itmtouch = input->private;

	usb_kill_urb(itmtouch->readurb);
}

static int itmtouch_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct itmtouch_dev *itmtouch;
	struct input_dev *input_dev;
	struct usb_host_interface *interface;
	struct usb_endpoint_descriptor *endpoint;
	struct usb_device *udev = interface_to_usbdev(intf);
	unsigned int pipe;
	unsigned int maxp;

	interface = intf->cur_altsetting;
	endpoint = &interface->endpoint[0].desc;

	itmtouch = kzalloc(sizeof(struct itmtouch_dev), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!itmtouch || !input_dev) {
		err("%s - Out of memory.", __FUNCTION__);
		goto fail;
	}

	itmtouch->usbdev = udev;
	itmtouch->inputdev = input_dev;

	if (udev->manufacturer)
		strlcpy(itmtouch->name, udev->manufacturer, sizeof(itmtouch->name));

	if (udev->product) {
		if (udev->manufacturer)
			strlcat(itmtouch->name, " ", sizeof(itmtouch->name));
		strlcat(itmtouch->name, udev->product, sizeof(itmtouch->name));
	}

	if (!strlen(itmtouch->name))
		sprintf(itmtouch->name, "USB ITM touchscreen");

	usb_make_path(udev, itmtouch->phys, sizeof(itmtouch->phys));
	strlcpy(itmtouch->phys, "/input0", sizeof(itmtouch->phys));

	input_dev->name = itmtouch->name;
	input_dev->phys = itmtouch->phys;
	usb_to_input_id(udev, &input_dev->id);
	input_dev->cdev.dev = &intf->dev;
	input_dev->private = itmtouch;

	input_dev->open = itmtouch_open;
	input_dev->close = itmtouch_close;

	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
	input_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);

	/* 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(input_dev, ABS_X, 0, 0x0FFF, 2, 0);
	input_set_abs_params(input_dev, ABS_Y, 0, 0x0FFF, 2, 0);
	input_set_abs_params(input_dev, 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__);
		goto fail;
	}

	usb_fill_int_urb(itmtouch->readurb, itmtouch->usbdev, pipe, itmtouch->rbuf,
			 maxp, itmtouch_irq, itmtouch, endpoint->bInterval);

	input_register_device(itmtouch->inputdev);

	usb_set_intfdata(intf, itmtouch);

	return 0;

 fail:	input_free_device(input_dev);
	kfree(itmtouch);
	return -ENOMEM;
}

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 = {
	.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);