1 // SPDX-License-Identifier: GPL-2.0-only
5  * Driver for the LetSketch / VSON WP9620N drawing tablet.
6  * This drawing tablet is also sold under other brand names such as Case U,
12  * to special key-combos. E.g. the 2 stylus buttons send right mouse clicks /
23  * Interface 1 EP 0x82 bootclass mouse, rdesc len 83, report id 0x0a, Tablet
27  *  with a phone in portraid mode, while using the tablet in landscape mode.
31  *  This interfaces send various hard-coded key-combos for the pad buttons
35  *  This reports right-click mouse-button events for the 1st stylus button
46 #include "hid-ids.h"
71 	return hid_hw_open(data->hdev);  in letsketch_open()
78 	hid_hw_close(data->hdev);  in letsketch_close()
85 	input = devm_input_allocate_device(&data->hdev->dev);  in letsketch_alloc_input_dev()
89 	input->id.bustype = data->hdev->bus;  in letsketch_alloc_input_dev()
90 	input->id.vendor  = data->hdev->vendor;  in letsketch_alloc_input_dev()
91 	input->id.product = data->hdev->product;  in letsketch_alloc_input_dev()
92 	input->id.version = data->hdev->bus;  in letsketch_alloc_input_dev()
93 	input->phys = data->hdev->phys;  in letsketch_alloc_input_dev()
94 	input->uniq = data->hdev->uniq;  in letsketch_alloc_input_dev()
95 	input->open = letsketch_open;  in letsketch_alloc_input_dev()
96 	input->close = letsketch_close;  in letsketch_alloc_input_dev()
109 		return -ENOMEM;  in letsketch_setup_input_tablet()
121 	/* All known brands selling this tablet use WP9620[N] as model name */  in letsketch_setup_input_tablet()
122 	input->name = "WP9620 Tablet";  in letsketch_setup_input_tablet()
124 	data->input_tablet = input;  in letsketch_setup_input_tablet()
126 	return input_register_device(data->input_tablet);  in letsketch_setup_input_tablet()
136 		return -ENOMEM;  in letsketch_setup_input_tablet_pad()
149 	input->name = "WP9620 Pad";  in letsketch_setup_input_tablet_pad()
151 	data->input_tablet_pad = input;  in letsketch_setup_input_tablet_pad()
153 	return input_register_device(data->input_tablet_pad);  in letsketch_setup_input_tablet_pad()
159 	struct input_dev *input = data->input_tablet;  in letsketch_inrange_timeout()
178 		input = data->input_tablet;  in letsketch_raw_event()
193 		mod_timer(&data->inrange_timer, jiffies + msecs_to_jiffies(100));  in letsketch_raw_event()
196 		input = data->input_tablet_pad;  in letsketch_raw_event()
201 		hid_warn(data->hdev, "Warning unknown data header: 0x%02x\n",  in letsketch_raw_event()
211  * The tablets magic handshake to put it in raw mode relies on getting
227 	dev_err(&udev->dev, "Max retries (%d) exceeded reading string descriptor %d\n",  in letsketch_get_string()
229 	return ret ? ret : -EIO;  in letsketch_get_string()
234 	struct device *dev = &hdev->dev;  in letsketch_probe()
242 		return -ENODEV;  in letsketch_probe()
244 	intf = to_usb_interface(hdev->dev.parent);  in letsketch_probe()
245 	if (intf->altsetting->desc.bInterfaceNumber != LETSKETCH_RAW_IF)  in letsketch_probe()
246 		return -ENODEV; /* Ignore the other interfaces */  in letsketch_probe()
251 	 * Instead of using a set-feature request, or even a custom USB ctrl  in letsketch_probe()
252 	 * message the tablet needs this elaborate magic reading of USB  in letsketch_probe()
253 	 * string descriptors to kick it into raw mode. This is what the  in letsketch_probe()
279 	 * The tablet should be in raw mode now, end with a final delay before  in letsketch_probe()
290 		return -ENOMEM;  in letsketch_probe()
292 	data->hdev = hdev;  in letsketch_probe()
293 	timer_setup(&data->inrange_timer, letsketch_inrange_timeout, 0);  in letsketch_probe()