1 // SPDX-License-Identifier: GPL-2.0-only
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>
9 * Pressure-threshold modules param code from Alex Perry <alex.perry@ieee.org>
12 MODULE_AUTHOR("Josh Myer <josh@joshisanerd.com>");
13 MODULE_DESCRIPTION("USB KB Gear JamStudio Tablet driver");
14 MODULE_LICENSE("GPL");
16 #define USB_VENDOR_ID_KBGEAR 0x084e
18 static int kb_pressure_click = 0x10;
19 module_param(kb_pressure_click, int, 0);
20 MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks");
25 struct input_dev *dev;
26 struct usb_interface *intf;
31 static void kbtab_irq(struct urb *urb)
33 struct kbtab *kbtab = urb->context;
34 unsigned char *data = kbtab->data;
35 struct input_dev *dev = kbtab->dev;
39 switch (urb->status) {
46 /* this urb is terminated, clean up */
47 dev_dbg(&kbtab->intf->dev,
48 "%s - urb shutting down with status: %d\n",
49 __func__, urb->status);
52 dev_dbg(&kbtab->intf->dev,
53 "%s - nonzero urb status received: %d\n",
54 __func__, urb->status);
59 input_report_key(dev, BTN_TOOL_PEN, 1);
61 input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));
62 input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3]));
64 /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/
65 input_report_key(dev, BTN_RIGHT, data[0] & 0x02);
68 if (kb_pressure_click == -1)
69 input_report_abs(dev, ABS_PRESSURE, pressure);
71 input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0);
76 retval = usb_submit_urb(urb, GFP_ATOMIC);
78 dev_err(&kbtab->intf->dev,
79 "%s - usb_submit_urb failed with result %d\n",
83 static const struct usb_device_id kbtab_ids[] = {
84 { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },
88 MODULE_DEVICE_TABLE(usb, kbtab_ids);
90 static int kbtab_open(struct input_dev *dev)
92 struct kbtab *kbtab = input_get_drvdata(dev);
93 struct usb_device *udev = interface_to_usbdev(kbtab->intf);
95 kbtab->irq->dev = udev;
96 if (usb_submit_urb(kbtab->irq, GFP_KERNEL))
102 static void kbtab_close(struct input_dev *dev)
104 struct kbtab *kbtab = input_get_drvdata(dev);
106 usb_kill_urb(kbtab->irq);
109 static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id)
111 struct usb_device *dev = interface_to_usbdev(intf);
112 struct usb_endpoint_descriptor *endpoint;
114 struct input_dev *input_dev;
117 if (intf->cur_altsetting->desc.bNumEndpoints < 1)
120 kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
121 input_dev = input_allocate_device();
122 if (!kbtab || !input_dev)
125 kbtab->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &kbtab->data_dma);
129 kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);
134 kbtab->dev = input_dev;
136 usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));
137 strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys));
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;
144 input_set_drvdata(input_dev, kbtab);
146 input_dev->open = kbtab_open;
147 input_dev->close = kbtab_close;
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);
158 endpoint = &intf->cur_altsetting->endpoint[0].desc;
160 usb_fill_int_urb(kbtab->irq, dev,
161 usb_rcvintpipe(dev, endpoint->bEndpointAddress),
163 kbtab_irq, kbtab, endpoint->bInterval);
164 kbtab->irq->transfer_dma = kbtab->data_dma;
165 kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
167 error = input_register_device(kbtab->dev);
171 usb_set_intfdata(intf, kbtab);
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);
182 static void kbtab_disconnect(struct usb_interface *intf)
184 struct kbtab *kbtab = usb_get_intfdata(intf);
185 struct usb_device *udev = interface_to_usbdev(intf);
187 usb_set_intfdata(intf, NULL);
189 input_unregister_device(kbtab->dev);
190 usb_free_urb(kbtab->irq);
191 usb_free_coherent(udev, 8, kbtab->data, kbtab->data_dma);
195 static struct usb_driver kbtab_driver = {
197 .probe = kbtab_probe,
198 .disconnect = kbtab_disconnect,
199 .id_table = kbtab_ids,
202 module_usb_driver(kbtab_driver);