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 * Pressure-threshold modules param code from Alex Perry <alex.perry@ieee.org>
9 */
10
11MODULE_AUTHOR("Josh Myer <josh@joshisanerd.com>");
12MODULE_DESCRIPTION("USB KB Gear JamStudio Tablet driver");
13MODULE_LICENSE("GPL");
14
15#define USB_VENDOR_ID_KBGEAR 0x084e
16
17static int kb_pressure_click = 0x10;
18module_param(kb_pressure_click, int, 0);
19MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
20
21struct kbtab {
22 unsigned char *data;
23 dma_addr_t data_dma;
24 struct input_dev *dev;
25 struct usb_interface *intf;
26 struct urb *irq;
27 char phys[32];
28};
29
30static void kbtab_irq(struct urb *urb)
31{
32 struct kbtab *kbtab = urb->context;
33 unsigned char *data = kbtab->data;
34 struct input_dev *dev = kbtab->dev;
35 int pressure;
36 int retval;
37
38 switch (urb->status) {
39 case 0:
40 /* success */
41 break;
42 case -ECONNRESET:
43 case -ENOENT:
44 case -ESHUTDOWN:
45 /* this urb is terminated, clean up */
46 dev_dbg(&kbtab->intf->dev,
47 "%s - urb shutting down with status: %d\n",
48 __func__, urb->status);
49 return;
50 default:
51 dev_dbg(&kbtab->intf->dev,
52 "%s - nonzero urb status received: %d\n",
53 __func__, urb->status);
54 goto exit;
55 }
56
57
58 input_report_key(dev, BTN_TOOL_PEN, 1);
59
60 input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
61 input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
62
63 /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
64 input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
65
66 pressure = data[5];
67 if (kb_pressure_click == -1)
68 input_report_abs(dev, ABS_PRESSURE, pressure);
69 else
70 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
71
72 input_sync(dev);
73
74 exit:
75 retval = usb_submit_urb(urb, GFP_ATOMIC);
76 if (retval)
77 dev_err(&kbtab->intf->dev,
78 "%s - usb_submit_urb failed with result %d\n",
79 __func__, retval);
80}
81
82static const struct usb_device_id kbtab_ids[] = {
83 { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
84 { }
85};
86
87MODULE_DEVICE_TABLE(usb, kbtab_ids);
88
89static int kbtab_open(struct input_dev *dev)
90{
91 struct kbtab *kbtab = input_get_drvdata(dev);
92 struct usb_device *udev = interface_to_usbdev(kbtab->intf);
93
94 kbtab->irq->dev = udev;
95 if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
96 return -EIO;
97
98 return 0;
99}
100
101static void kbtab_close(struct input_dev *dev)
102{
103 struct kbtab *kbtab = input_get_drvdata(dev);
104
105 usb_kill_urb(kbtab->irq);
106}
107
108static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
109{
110 struct usb_device *dev = interface_to_usbdev(intf);
111 struct usb_endpoint_descriptor *endpoint;
112 struct kbtab *kbtab;
113 struct input_dev *input_dev;
114 int error = -ENOMEM;
115
116 if (intf->cur_altsetting->desc.bNumEndpoints < 1)
117 return -ENODEV;
118
119 kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
120 input_dev = input_allocate_device();
121 if (!kbtab || !input_dev)
122 goto fail1;
123
124 kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
125 if (!kbtab->data)
126 goto fail1;
127
128 kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
129 if (!kbtab->irq)
130 goto fail2;
131
132 kbtab->intf = intf;
133 kbtab->dev = input_dev;
134
135 usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
136 strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
137
138 input_dev->name = "KB Gear Tablet";
139 input_dev->phys = kbtab->phys;
140 usb_to_input_id(dev, &input_dev->id);
141 input_dev->dev.parent = &intf->dev;
142
143 input_set_drvdata(input_dev, kbtab);
144
145 input_dev->open = kbtab_open;
146 input_dev->close = kbtab_close;
147
148 input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
149 input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
150 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
151 input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
152 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
153 input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
154 input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
155 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
156
157 endpoint = &intf->cur_altsetting->endpoint[0].desc;
158
159 usb_fill_int_urb(kbtab->irq, dev,
160 usb_rcvintpipe(dev, endpoint->bEndpointAddress),
161 kbtab->data, 8,
162 kbtab_irq, kbtab, endpoint->bInterval);
163 kbtab->irq->transfer_dma = kbtab->data_dma;
164 kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
165
166 error = input_register_device(kbtab->dev);
167 if (error)
168 goto fail3;
169
170 usb_set_intfdata(intf, kbtab);
171
172 return 0;
173
174 fail3: usb_free_urb(kbtab->irq);
175 fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
176 fail1: input_free_device(input_dev);
177 kfree(kbtab);
178 return error;
179}
180
181static void kbtab_disconnect(struct usb_interface *intf)
182{
183 struct kbtab *kbtab = usb_get_intfdata(intf);
184 struct usb_device *udev = interface_to_usbdev(intf);
185
186 usb_set_intfdata(intf, NULL);
187
188 input_unregister_device(kbtab->dev);
189 usb_free_urb(kbtab->irq);
190 usb_free_coherent(udev, 8, kbtab->data, kbtab->data_dma);
191 kfree(kbtab);
192}
193
194static struct usb_driver kbtab_driver = {
195 .name = "kbtab",
196 .probe = kbtab_probe,
197 .disconnect = kbtab_disconnect,
198 .id_table = kbtab_ids,
199};
200
201module_usb_driver(kbtab_driver);
202