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
11 MODULE_AUTHOR("Josh Myer <josh@joshisanerd.com>");
12 MODULE_DESCRIPTION("USB KB Gear JamStudio Tablet driver");
13 MODULE_LICENSE("GPL");
14
15 #define USB_VENDOR_ID_KBGEAR 0x084e
16
17 static int kb_pressure_click = 0x10;
18 module_param(kb_pressure_click, int, 0);
19 MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
20
21 struct 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
kbtab_irq(struct urb * urb)30 static 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
82 static const struct usb_device_id kbtab_ids[] = {
83 { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
84 { }
85 };
86
87 MODULE_DEVICE_TABLE(usb, kbtab_ids);
88
kbtab_open(struct input_dev * dev)89 static 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
kbtab_close(struct input_dev * dev)101 static 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
kbtab_probe(struct usb_interface * intf,const struct usb_device_id * id)108 static 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 endpoint = &intf->cur_altsetting->endpoint[0].desc;
120 if (!usb_endpoint_is_int_in(endpoint))
121 return -ENODEV;
122
123 kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
124 input_dev = input_allocate_device();
125 if (!kbtab || !input_dev)
126 goto fail1;
127
128 kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
129 if (!kbtab->data)
130 goto fail1;
131
132 kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
133 if (!kbtab->irq)
134 goto fail2;
135
136 kbtab->intf = intf;
137 kbtab->dev = input_dev;
138
139 usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
140 strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
141
142 input_dev->name = "KB Gear Tablet";
143 input_dev->phys = kbtab->phys;
144 usb_to_input_id(dev, &input_dev->id);
145 input_dev->dev.parent = &intf->dev;
146
147 input_set_drvdata(input_dev, kbtab);
148
149 input_dev->open = kbtab_open;
150 input_dev->close = kbtab_close;
151
152 input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
153 input_dev->keybit[BIT_WORD(BTN_LEFT)] |=
154 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
155 input_dev->keybit[BIT_WORD(BTN_DIGI)] |=
156 BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
157 input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);
158 input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);
159 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0);
160
161 usb_fill_int_urb(kbtab->irq, dev,
162 usb_rcvintpipe(dev, endpoint->bEndpointAddress),
163 kbtab->data, 8,
164 kbtab_irq, kbtab, endpoint->bInterval);
165 kbtab->irq->transfer_dma = kbtab->data_dma;
166 kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
167
168 error = input_register_device(kbtab->dev);
169 if (error)
170 goto fail3;
171
172 usb_set_intfdata(intf, kbtab);
173
174 return 0;
175
176 fail3: usb_free_urb(kbtab->irq);
177 fail2: usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma);
178 fail1: input_free_device(input_dev);
179 kfree(kbtab);
180 return error;
181 }
182
kbtab_disconnect(struct usb_interface * intf)183 static void kbtab_disconnect(struct usb_interface *intf)
184 {
185 struct kbtab *kbtab = usb_get_intfdata(intf);
186 struct usb_device *udev = interface_to_usbdev(intf);
187
188 usb_set_intfdata(intf, NULL);
189
190 input_unregister_device(kbtab->dev);
191 usb_free_urb(kbtab->irq);
192 usb_free_coherent(udev, 8, kbtab->data, kbtab->data_dma);
193 kfree(kbtab);
194 }
195
196 static struct usb_driver kbtab_driver = {
197 .name = "kbtab",
198 .probe = kbtab_probe,
199 .disconnect = kbtab_disconnect,
200 .id_table = kbtab_ids,
201 };
202
203 module_usb_driver(kbtab_driver);
204