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> |
7 | |
8 | /* |
9 | * Pressure-threshold modules param code from Alex Perry <alex.perry@ieee.org> |
10 | */ |
11 | |
12 | MODULE_AUTHOR("Josh Myer <josh@joshisanerd.com>" ); |
13 | MODULE_DESCRIPTION("USB KB Gear JamStudio Tablet driver" ); |
14 | MODULE_LICENSE("GPL" ); |
15 | |
16 | #define USB_VENDOR_ID_KBGEAR 0x084e |
17 | |
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" ); |
21 | |
22 | struct 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 | |
31 | static 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 | /* success */ |
42 | break; |
43 | case -ECONNRESET: |
44 | case -ENOENT: |
45 | case -ESHUTDOWN: |
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); |
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, value: 1); |
60 | |
61 | input_report_abs(dev, ABS_X, value: get_unaligned_le16(p: &data[1])); |
62 | input_report_abs(dev, ABS_Y, value: get_unaligned_le16(p: &data[3])); |
63 | |
64 | /*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/ |
65 | input_report_key(dev, BTN_RIGHT, value: data[0] & 0x02); |
66 | |
67 | pressure = data[5]; |
68 | if (kb_pressure_click == -1) |
69 | input_report_abs(dev, ABS_PRESSURE, value: pressure); |
70 | else |
71 | input_report_key(dev, BTN_LEFT, value: 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 | |
83 | static const struct usb_device_id kbtab_ids[] = { |
84 | { USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 }, |
85 | { } |
86 | }; |
87 | |
88 | MODULE_DEVICE_TABLE(usb, kbtab_ids); |
89 | |
90 | static 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(urb: kbtab->irq, GFP_KERNEL)) |
97 | return -EIO; |
98 | |
99 | return 0; |
100 | } |
101 | |
102 | static void kbtab_close(struct input_dev *dev) |
103 | { |
104 | struct kbtab *kbtab = input_get_drvdata(dev); |
105 | |
106 | usb_kill_urb(urb: kbtab->irq); |
107 | } |
108 | |
109 | static 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 | endpoint = &intf->cur_altsetting->endpoint[0].desc; |
121 | if (!usb_endpoint_is_int_in(epd: endpoint)) |
122 | return -ENODEV; |
123 | |
124 | kbtab = kzalloc(size: sizeof(struct kbtab), GFP_KERNEL); |
125 | input_dev = input_allocate_device(); |
126 | if (!kbtab || !input_dev) |
127 | goto fail1; |
128 | |
129 | kbtab->data = usb_alloc_coherent(dev, size: 8, GFP_KERNEL, dma: &kbtab->data_dma); |
130 | if (!kbtab->data) |
131 | goto fail1; |
132 | |
133 | kbtab->irq = usb_alloc_urb(iso_packets: 0, GFP_KERNEL); |
134 | if (!kbtab->irq) |
135 | goto fail2; |
136 | |
137 | kbtab->intf = intf; |
138 | kbtab->dev = input_dev; |
139 | |
140 | usb_make_path(dev, buf: kbtab->phys, size: sizeof(kbtab->phys)); |
141 | strlcat(p: kbtab->phys, q: "/input0" , avail: sizeof(kbtab->phys)); |
142 | |
143 | input_dev->name = "KB Gear Tablet" ; |
144 | input_dev->phys = kbtab->phys; |
145 | usb_to_input_id(dev, id: &input_dev->id); |
146 | input_dev->dev.parent = &intf->dev; |
147 | |
148 | input_set_drvdata(dev: input_dev, data: kbtab); |
149 | |
150 | input_dev->open = kbtab_open; |
151 | input_dev->close = kbtab_close; |
152 | |
153 | input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
154 | input_dev->keybit[BIT_WORD(BTN_LEFT)] |= |
155 | BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT); |
156 | input_dev->keybit[BIT_WORD(BTN_DIGI)] |= |
157 | BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH); |
158 | input_set_abs_params(dev: input_dev, ABS_X, min: 0, max: 0x2000, fuzz: 4, flat: 0); |
159 | input_set_abs_params(dev: input_dev, ABS_Y, min: 0, max: 0x1750, fuzz: 4, flat: 0); |
160 | input_set_abs_params(dev: input_dev, ABS_PRESSURE, min: 0, max: 0xff, fuzz: 0, flat: 0); |
161 | |
162 | usb_fill_int_urb(urb: kbtab->irq, dev, |
163 | usb_rcvintpipe(dev, endpoint->bEndpointAddress), |
164 | transfer_buffer: kbtab->data, buffer_length: 8, |
165 | complete_fn: kbtab_irq, context: kbtab, interval: endpoint->bInterval); |
166 | kbtab->irq->transfer_dma = kbtab->data_dma; |
167 | kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
168 | |
169 | error = input_register_device(kbtab->dev); |
170 | if (error) |
171 | goto fail3; |
172 | |
173 | usb_set_intfdata(intf, data: kbtab); |
174 | |
175 | return 0; |
176 | |
177 | fail3: usb_free_urb(urb: kbtab->irq); |
178 | fail2: usb_free_coherent(dev, size: 8, addr: kbtab->data, dma: kbtab->data_dma); |
179 | fail1: input_free_device(dev: input_dev); |
180 | kfree(objp: kbtab); |
181 | return error; |
182 | } |
183 | |
184 | static void kbtab_disconnect(struct usb_interface *intf) |
185 | { |
186 | struct kbtab *kbtab = usb_get_intfdata(intf); |
187 | struct usb_device *udev = interface_to_usbdev(intf); |
188 | |
189 | usb_set_intfdata(intf, NULL); |
190 | |
191 | input_unregister_device(kbtab->dev); |
192 | usb_free_urb(urb: kbtab->irq); |
193 | usb_free_coherent(dev: udev, size: 8, addr: kbtab->data, dma: kbtab->data_dma); |
194 | kfree(objp: kbtab); |
195 | } |
196 | |
197 | static struct usb_driver kbtab_driver = { |
198 | .name = "kbtab" , |
199 | .probe = kbtab_probe, |
200 | .disconnect = kbtab_disconnect, |
201 | .id_table = kbtab_ids, |
202 | }; |
203 | |
204 | module_usb_driver(kbtab_driver); |
205 | |