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
9
10
11
12
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_interface *intf;
35 struct urb *irq;
36 char phys[32];
37};
38
39static void kbtab_irq(struct urb *urb)
40{
41 struct kbtab *kbtab = urb->context;
42 unsigned char *data = kbtab->data;
43 struct input_dev *dev = kbtab->dev;
44 int pressure;
45 int retval;
46
47 switch (urb->status) {
48 case 0:
49
50 break;
51 case -ECONNRESET:
52 case -ENOENT:
53 case -ESHUTDOWN:
54
55 dev_dbg(&kbtab->intf->dev,
56 "%s - urb shutting down with status: %d\n",
57 __func__, urb->status);
58 return;
59 default:
60 dev_dbg(&kbtab->intf->dev,
61 "%s - nonzero urb status received: %d\n",
62 __func__, urb->status);
63 goto exit;
64 }
65
66
67 input_report_key(dev, BTN_TOOL_PEN, 1);
68
69 input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
70 input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
71
72
73 input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
74
75 pressure = data[5];
76 if (kb_pressure_click == -1)
77 input_report_abs(dev, ABS_PRESSURE, pressure);
78 else
79 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
80
81 input_sync(dev);
82
83 exit:
84 retval = usb_submit_urb(urb, GFP_ATOMIC);
85 if (retval)
86 dev_err(&kbtab->intf->dev,
87 "%s - usb_submit_urb failed with result %d\n",
88 __func__, retval);
89}
90
91static struct usb_device_id kbtab_ids[] = {
92 { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
93 { }
94};
95
96MODULE_DEVICE_TABLE(usb, kbtab_ids);
97
98static int kbtab_open(struct input_dev *dev)
99{
100 struct kbtab *kbtab = input_get_drvdata(dev);
101 struct usb_device *udev = interface_to_usbdev(kbtab->intf);
102
103 kbtab->irq->dev = udev;
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 if (intf->cur_altsetting->desc.bNumEndpoints < 1)
126 return -ENODEV;
127
128 kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
129 input_dev = input_allocate_device();
130 if (!kbtab || !input_dev)
131 goto fail1;
132
133 kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
134 if (!kbtab->data)
135 goto fail1;
136
137 kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
138 if (!kbtab->irq)
139 goto fail2;
140
141 kbtab->intf = intf;
142 kbtab->dev = input_dev;
143
144 usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
145 strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
146
147 input_dev->name = "KB Gear Tablet";
148 input_dev->phys = kbtab->phys;
149 usb_to_input_id(dev, &input_dev->id);
150 input_dev->dev.parent = &intf->dev;
151
152 input_set_drvdata(input_dev, kbtab);
153
154 input_dev->open = kbtab_open;
155 input_dev->close = kbtab_close;
156
157 input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
158 input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
159 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
160 input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
161 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
162 input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
163 input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
164 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
165
166 endpoint = &intf->cur_altsetting->endpoint[0].desc;
167
168 usb_fill_int_urb(kbtab->irq, dev,
169 usb_rcvintpipe(dev, endpoint->bEndpointAddress),
170 kbtab->data, 8,
171 kbtab_irq, kbtab, endpoint->bInterval);
172 kbtab->irq->transfer_dma = kbtab->data_dma;
173 kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
174
175 error = input_register_device(kbtab->dev);
176 if (error)
177 goto fail3;
178
179 usb_set_intfdata(intf, kbtab);
180
181 return 0;
182
183 fail3: usb_free_urb(kbtab->irq);
184 fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
185 fail1: input_free_device(input_dev);
186 kfree(kbtab);
187 return error;
188}
189
190static void kbtab_disconnect(struct usb_interface *intf)
191{
192 struct kbtab *kbtab = usb_get_intfdata(intf);
193 struct usb_device *udev = interface_to_usbdev(intf);
194
195 usb_set_intfdata(intf, NULL);
196
197 input_unregister_device(kbtab->dev);
198 usb_free_urb(kbtab->irq);
199 usb_free_coherent(udev, 8, kbtab->data, kbtab->data_dma);
200 kfree(kbtab);
201}
202
203static struct usb_driver kbtab_driver = {
204 .name = "kbtab",
205 .probe = kbtab_probe,
206 .disconnect = kbtab_disconnect,
207 .id_table = kbtab_ids,
208};
209
210module_usb_driver(kbtab_driver);
211
