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