1#include <linux/kernel.h>
2#include <linux/slab.h>
3#include <linux/module.h>
4#include <linux/init.h>
5#include <linux/usb/input.h>
6#include <asm/unaligned.h>
7
8
9
10
11
12
13
14
15
16#define DRIVER_VERSION "v0.0.2"
17#define DRIVER_AUTHOR "Josh Myer <josh@joshisanerd.com>"
18#define DRIVER_DESC "USB KB Gear JamStudio Tablet driver"
19#define DRIVER_LICENSE "GPL"
20
21MODULE_AUTHOR(DRIVER_AUTHOR);
22MODULE_DESCRIPTION(DRIVER_DESC);
23MODULE_LICENSE(DRIVER_LICENSE);
24
25#define USB_VENDOR_ID_KBGEAR 0x084e
26
27static int kb_pressure_click = 0x10;
28module_param(kb_pressure_click, int, 0);
29MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
30
31struct kbtab {
32 unsigned char *data;
33 dma_addr_t data_dma;
34 struct input_dev *dev;
35 struct usb_device *usbdev;
36 struct usb_interface *intf;
37 struct urb *irq;
38 char phys[32];
39};
40
41static void kbtab_irq(struct urb *urb)
42{
43 struct kbtab *kbtab = urb->context;
44 unsigned char *data = kbtab->data;
45 struct input_dev *dev = kbtab->dev;
46 int pressure;
47 int retval;
48
49 switch (urb->status) {
50 case 0:
51
52 break;
53 case -ECONNRESET:
54 case -ENOENT:
55 case -ESHUTDOWN:
56
57 dev_dbg(&kbtab->intf->dev,
58 "%s - urb shutting down with status: %d\n",
59 __func__, urb->status);
60 return;
61 default:
62 dev_dbg(&kbtab->intf->dev,
63 "%s - nonzero urb status received: %d\n",
64 __func__, urb->status);
65 goto exit;
66 }
67
68
69 input_report_key(dev, BTN_TOOL_PEN, 1);
70
71 input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
72 input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
73
74
75 input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
76
77 pressure = data[5];
78 if (kb_pressure_click == -1)
79 input_report_abs(dev, ABS_PRESSURE, pressure);
80 else
81 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
82
83 input_sync(dev);
84
85 exit:
86 retval = usb_submit_urb(urb, GFP_ATOMIC);
87 if (retval)
88 dev_err(&kbtab->intf->dev,
89 "%s - usb_submit_urb failed with result %d\n",
90 __func__, retval);
91}
92
93static struct usb_device_id kbtab_ids[] = {
94 { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
95 { }
96};
97
98MODULE_DEVICE_TABLE(usb, kbtab_ids);
99
100static int kbtab_open(struct input_dev *dev)
101{
102 struct kbtab *kbtab = input_get_drvdata(dev);
103
104 kbtab->irq->dev = kbtab->usbdev;
105 if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
106 return -EIO;
107
108 return 0;
109}
110
111static void kbtab_close(struct input_dev *dev)
112{
113 struct kbtab *kbtab = input_get_drvdata(dev);
114
115 usb_kill_urb(kbtab->irq);
116}
117
118static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
119{
120 struct usb_device *dev = interface_to_usbdev(intf);
121 struct usb_endpoint_descriptor *endpoint;
122 struct kbtab *kbtab;
123 struct input_dev *input_dev;
124 int error = -ENOMEM;
125
126 kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
127 input_dev = input_allocate_device();
128 if (!kbtab || !input_dev)
129 goto fail1;
130
131 kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
132 if (!kbtab->data)
133 goto fail1;
134
135 kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
136 if (!kbtab->irq)
137 goto fail2;
138
139 kbtab->usbdev = dev;
140 kbtab->intf = intf;
141 kbtab->dev = input_dev;
142
143 usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
144 strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
145
146 input_dev->name = "KB Gear Tablet";
147 input_dev->phys = kbtab->phys;
148 usb_to_input_id(dev, &input_dev->id);
149 input_dev->dev.parent = &intf->dev;
150
151 input_set_drvdata(input_dev, kbtab);
152
153 input_dev->open = kbtab_open;
154 input_dev->close = kbtab_close;
155
156 input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
157 input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
158 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
159 input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
160 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
161 input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
162 input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
163 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
164
165 endpoint = &intf->cur_altsetting->endpoint[0].desc;
166
167 usb_fill_int_urb(kbtab->irq, dev,
168 usb_rcvintpipe(dev, endpoint->bEndpointAddress),
169 kbtab->data, 8,
170 kbtab_irq, kbtab, endpoint->bInterval);
171 kbtab->irq->transfer_dma = kbtab->data_dma;
172 kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
173
174 error = input_register_device(kbtab->dev);
175 if (error)
176 goto fail3;
177
178 usb_set_intfdata(intf, kbtab);
179
180 return 0;
181
182 fail3: usb_free_urb(kbtab->irq);
183 fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
184 fail1: input_free_device(input_dev);
185 kfree(kbtab);
186 return error;
187}
188
189static void kbtab_disconnect(struct usb_interface *intf)
190{
191 struct kbtab *kbtab = usb_get_intfdata(intf);
192
193 usb_set_intfdata(intf, NULL);
194
195 input_unregister_device(kbtab->dev);
196 usb_free_urb(kbtab->irq);
197 usb_free_coherent(kbtab->usbdev, 8, kbtab->data, kbtab->data_dma);
198 kfree(kbtab);
199}
200
201static struct usb_driver kbtab_driver = {
202 .name = "kbtab",
203 .probe = kbtab_probe,
204 .disconnect = kbtab_disconnect,
205 .id_table = kbtab_ids,
206};
207
208module_usb_driver(kbtab_driver);
209
