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