1#include <linux/kernel.h>
2#include <linux/slab.h>
3#include <linux/module.h>
4#include <linux/usb/input.h>
5#include <asm/unaligned.h>
6
7/*
8 * Version Information
9 * v0.0.1 - Original, extremely basic version, 2.4.xx only
10 * v0.0.2 - Updated, works with 2.5.62 and 2.4.20;
11 *           - added pressure-threshold modules param code from
12 *              Alex Perry <alex.perry@ieee.org>
13 */
14
15#define DRIVER_VERSION "v0.0.2"
16#define DRIVER_AUTHOR "Josh Myer <josh@joshisanerd.com>"
17#define DRIVER_DESC "USB KB Gear JamStudio Tablet driver"
18#define DRIVER_LICENSE "GPL"
19
20MODULE_AUTHOR(DRIVER_AUTHOR);
21MODULE_DESCRIPTION(DRIVER_DESC);
22MODULE_LICENSE(DRIVER_LICENSE);
23
24#define USB_VENDOR_ID_KBGEAR	0x084e
25
26static int kb_pressure_click = 0x10;
27module_param(kb_pressure_click, int, 0);
28MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
29
30struct kbtab {
31	unsigned char *data;
32	dma_addr_t data_dma;
33	struct input_dev *dev;
34	struct usb_device *usbdev;
35	struct usb_interface *intf;
36	struct urb *irq;
37	char phys[32];
38};
39
40static void kbtab_irq(struct urb *urb)
41{
42	struct kbtab *kbtab = urb->context;
43	unsigned char *data = kbtab->data;
44	struct input_dev *dev = kbtab->dev;
45	int pressure;
46	int retval;
47
48	switch (urb->status) {
49	case 0:
50		/* success */
51		break;
52	case -ECONNRESET:
53	case -ENOENT:
54	case -ESHUTDOWN:
55		/* this urb is terminated, clean up */
56		dev_dbg(&kbtab->intf->dev,
57			"%s - urb shutting down with status: %d\n",
58			__func__, urb->status);
59		return;
60	default:
61		dev_dbg(&kbtab->intf->dev,
62			"%s - nonzero urb status received: %d\n",
63			__func__, urb->status);
64		goto exit;
65	}
66
67
68	input_report_key(dev, BTN_TOOL_PEN, 1);
69
70	input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
71	input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
72
73	/*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
74	input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
75
76	pressure = data[5];
77	if (kb_pressure_click == -1)
78		input_report_abs(dev, ABS_PRESSURE, pressure);
79	else
80		input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
81
82	input_sync(dev);
83
84 exit:
85	retval = usb_submit_urb(urb, GFP_ATOMIC);
86	if (retval)
87		dev_err(&kbtab->intf->dev,
88			"%s - usb_submit_urb failed with result %d\n",
89			__func__, retval);
90}
91
92static struct usb_device_id kbtab_ids[] = {
93	{ USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
94	{ }
95};
96
97MODULE_DEVICE_TABLE(usb, kbtab_ids);
98
99static int kbtab_open(struct input_dev *dev)
100{
101	struct kbtab *kbtab = input_get_drvdata(dev);
102
103	kbtab->irq->dev = kbtab->usbdev;
104	if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
105		return -EIO;
106
107	return 0;
108}
109
110static void kbtab_close(struct input_dev *dev)
111{
112	struct kbtab *kbtab = input_get_drvdata(dev);
113
114	usb_kill_urb(kbtab->irq);
115}
116
117static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
118{
119	struct usb_device *dev = interface_to_usbdev(intf);
120	struct usb_endpoint_descriptor *endpoint;
121	struct kbtab *kbtab;
122	struct input_dev *input_dev;
123	int error = -ENOMEM;
124
125	kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
126	input_dev = input_allocate_device();
127	if (!kbtab || !input_dev)
128		goto fail1;
129
130	kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
131	if (!kbtab->data)
132		goto fail1;
133
134	kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
135	if (!kbtab->irq)
136		goto fail2;
137
138	kbtab->usbdev = dev;
139	kbtab->intf = intf;
140	kbtab->dev = input_dev;
141
142	usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
143	strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
144
145	input_dev->name = "KB Gear Tablet";
146	input_dev->phys = kbtab->phys;
147	usb_to_input_id(dev, &input_dev->id);
148	input_dev->dev.parent = &intf->dev;
149
150	input_set_drvdata(input_dev, kbtab);
151
152	input_dev->open = kbtab_open;
153	input_dev->close = kbtab_close;
154
155	input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
156	input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
157		BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
158	input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
159		BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
160	input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
161	input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
162	input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
163
164	endpoint = &intf->cur_altsetting->endpoint[0].desc;
165
166	usb_fill_int_urb(kbtab->irq, dev,
167			 usb_rcvintpipe(dev, endpoint->bEndpointAddress),
168			 kbtab->data, 8,
169			 kbtab_irq, kbtab, endpoint->bInterval);
170	kbtab->irq->transfer_dma = kbtab->data_dma;
171	kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
172
173	error = input_register_device(kbtab->dev);
174	if (error)
175		goto fail3;
176
177	usb_set_intfdata(intf, kbtab);
178
179	return 0;
180
181 fail3:	usb_free_urb(kbtab->irq);
182 fail2:	usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
183 fail1:	input_free_device(input_dev);
184	kfree(kbtab);
185	return error;
186}
187
188static void kbtab_disconnect(struct usb_interface *intf)
189{
190	struct kbtab *kbtab = usb_get_intfdata(intf);
191
192	usb_set_intfdata(intf, NULL);
193
194	input_unregister_device(kbtab->dev);
195	usb_free_urb(kbtab->irq);
196	usb_free_coherent(kbtab->usbdev, 8, kbtab->data, kbtab->data_dma);
197	kfree(kbtab);
198}
199
200static struct usb_driver kbtab_driver = {
201	.name =		"kbtab",
202	.probe =	kbtab_probe,
203	.disconnect =	kbtab_disconnect,
204	.id_table =	kbtab_ids,
205};
206
207module_usb_driver(kbtab_driver);
208