Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include <linux/kernel.h>
2#include <linux/slab.h>
3#include <linux/input.h>
4#include <linux/module.h>
5#include <linux/init.h>
6#include <linux/usb.h>
7#include <asm/unaligned.h>
8#include <asm/byteorder.h>
9
10/*
11 * Version Information
12 * v0.0.1 - Original, extremely basic version, 2.4.xx only
13 * v0.0.2 - Updated, works with 2.5.62 and 2.4.20;
14 * - added pressure-threshold modules param code from
15 * Alex Perry <alex.perry@ieee.org>
16 */
17
18#define DRIVER_VERSION "v0.0.2"
19#define DRIVER_AUTHOR "Josh Myer <josh@joshisanerd.com>"
20#define DRIVER_DESC "USB KB Gear JamStudio Tablet driver"
21#define DRIVER_LICENSE "GPL"
22
23MODULE_AUTHOR(DRIVER_AUTHOR);
24MODULE_DESCRIPTION(DRIVER_DESC);
25MODULE_LICENSE(DRIVER_LICENSE);
26
27#define USB_VENDOR_ID_KBGEAR 0x084e
28
29static int kb_pressure_click = 0x10;
30module_param(kb_pressure_click, int, 0);
31MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
32
33struct kbtab {
34 signed char *data;
35 dma_addr_t data_dma;
36 struct input_dev dev;
37 struct usb_device *usbdev;
38 struct urb *irq;
39 int x, y;
40 int button;
41 int pressure;
42 __u32 serial[2];
43 char phys[32];
44};
45
46static void kbtab_irq(struct urb *urb, struct pt_regs *regs)
47{
48 struct kbtab *kbtab = urb->context;
49 unsigned char *data = kbtab->data;
50 struct input_dev *dev = &kbtab->dev;
51 int retval;
52
53 switch (urb->status) {
54 case 0:
55 /* success */
56 break;
57 case -ECONNRESET:
58 case -ENOENT:
59 case -ESHUTDOWN:
60 /* this urb is terminated, clean up */
61 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
62 return;
63 default:
64 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
65 goto exit;
66 }
67
68 kbtab->x = le16_to_cpu(get_unaligned((__le16 *) &data[1]));
69 kbtab->y = le16_to_cpu(get_unaligned((__le16 *) &data[3]));
70
71 kbtab->pressure = (data[5]);
72
73 input_report_key(dev, BTN_TOOL_PEN, 1);
74
75 input_report_abs(dev, ABS_X, kbtab->x);
76 input_report_abs(dev, ABS_Y, kbtab->y);
77
78 /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
79 input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
80
81 if (-1 == kb_pressure_click) {
82 input_report_abs(dev, ABS_PRESSURE, kbtab->pressure);
83 } else {
84 input_report_key(dev, BTN_LEFT, (kbtab->pressure > kb_pressure_click) ? 1 : 0);
85 };
86
87 input_sync(dev);
88
89 exit:
90 retval = usb_submit_urb (urb, GFP_ATOMIC);
91 if (retval)
92 err ("%s - usb_submit_urb failed with result %d",
93 __FUNCTION__, retval);
94}
95
96static struct usb_device_id kbtab_ids[] = {
97 { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
98 { }
99};
100
101MODULE_DEVICE_TABLE(usb, kbtab_ids);
102
103static int kbtab_open(struct input_dev *dev)
104{
105 struct kbtab *kbtab = dev->private;
106
107 kbtab->irq->dev = kbtab->usbdev;
108 if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
109 return -EIO;
110
111 return 0;
112}
113
114static void kbtab_close(struct input_dev *dev)
115{
116 struct kbtab *kbtab = dev->private;
117
118 usb_kill_urb(kbtab->irq);
119}
120
121static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
122{
123 struct usb_device *dev = interface_to_usbdev(intf);
124 struct usb_endpoint_descriptor *endpoint;
125 struct kbtab *kbtab;
126 char path[64];
127
128 if (!(kbtab = kmalloc(sizeof(struct kbtab), GFP_KERNEL)))
129 return -ENOMEM;
130 memset(kbtab, 0, sizeof(struct kbtab));
131
132 kbtab->data = usb_buffer_alloc(dev, 8, GFP_KERNEL, &kbtab->data_dma);
133 if (!kbtab->data) {
134 kfree(kbtab);
135 return -ENOMEM;
136 }
137
138 kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
139 if (!kbtab->irq) {
140 usb_buffer_free(dev, 10, kbtab->data, kbtab->data_dma);
141 kfree(kbtab);
142 return -ENOMEM;
143 }
144
145 kbtab->dev.evbit[0] |= BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_MSC);
146 kbtab->dev.absbit[0] |= BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
147
148 kbtab->dev.keybit[LONG(BTN_LEFT)] |= BIT(BTN_LEFT) | BIT(BTN_RIGHT) | BIT(BTN_MIDDLE);
149
150 kbtab->dev.keybit[LONG(BTN_DIGI)] |= BIT(BTN_TOOL_PEN) | BIT(BTN_TOUCH);
151
152 kbtab->dev.mscbit[0] |= BIT(MSC_SERIAL);
153
154 kbtab->dev.absmax[ABS_X] = 0x2000;
155 kbtab->dev.absmax[ABS_Y] = 0x1750;
156 kbtab->dev.absmax[ABS_PRESSURE] = 0xff;
157
158 kbtab->dev.absfuzz[ABS_X] = 4;
159 kbtab->dev.absfuzz[ABS_Y] = 4;
160
161 kbtab->dev.private = kbtab;
162 kbtab->dev.open = kbtab_open;
163 kbtab->dev.close = kbtab_close;
164
165 usb_make_path(dev, path, 64);
166 sprintf(kbtab->phys, "%s/input0", path);
167
168 kbtab->dev.name = "KB Gear Tablet";
169 kbtab->dev.phys = kbtab->phys;
170 kbtab->dev.id.bustype = BUS_USB;
171 kbtab->dev.id.vendor = le16_to_cpu(dev->descriptor.idVendor);
172 kbtab->dev.id.product = le16_to_cpu(dev->descriptor.idProduct);
173 kbtab->dev.id.version = le16_to_cpu(dev->descriptor.bcdDevice);
174 kbtab->dev.dev = &intf->dev;
175 kbtab->usbdev = dev;
176
177 endpoint = &intf->cur_altsetting->endpoint[0].desc;
178
179 usb_fill_int_urb(kbtab->irq, dev,
180 usb_rcvintpipe(dev, endpoint->bEndpointAddress),
181 kbtab->data, 8,
182 kbtab_irq, kbtab, endpoint->bInterval);
183 kbtab->irq->transfer_dma = kbtab->data_dma;
184 kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
185
186 input_register_device(&kbtab->dev);
187
188 printk(KERN_INFO "input: KB Gear Tablet on %s\n", path);
189
190 usb_set_intfdata(intf, kbtab);
191
192 return 0;
193}
194
195static void kbtab_disconnect(struct usb_interface *intf)
196{
197 struct kbtab *kbtab = usb_get_intfdata (intf);
198
199 usb_set_intfdata(intf, NULL);
200 if (kbtab) {
201 usb_kill_urb(kbtab->irq);
202 input_unregister_device(&kbtab->dev);
203 usb_free_urb(kbtab->irq);
204 usb_buffer_free(interface_to_usbdev(intf), 10, kbtab->data, kbtab->data_dma);
205 kfree(kbtab);
206 }
207}
208
209static struct usb_driver kbtab_driver = {
210 .owner = THIS_MODULE,
211 .name = "kbtab",
212 .probe = kbtab_probe,
213 .disconnect = kbtab_disconnect,
214 .id_table = kbtab_ids,
215};
216
217static int __init kbtab_init(void)
218{
219 int retval;
220 retval = usb_register(&kbtab_driver);
221 if (retval)
222 goto out;
223 info(DRIVER_VERSION ":" DRIVER_DESC);
224out:
225 return retval;
226}
227
228static void __exit kbtab_exit(void)
229{
230 usb_deregister(&kbtab_driver);
231}
232
233module_init(kbtab_init);
234module_exit(kbtab_exit);