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323 lines
9.2 KiB
C
323 lines
9.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2021 Hans de Goede <hdegoede@redhat.com>
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*
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* Driver for the LetSketch / VSON WP9620N drawing tablet.
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* This drawing tablet is also sold under other brand names such as Case U,
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* presumably this driver will work for all of them. But it has only been
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* tested with a LetSketch WP9620N model.
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*
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* These tablets also work without a special HID driver, but then only part
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* of the active area works and both the pad and stylus buttons are hardwired
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* to special key-combos. E.g. the 2 stylus buttons send right mouse clicks /
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* resp. "e" key presses.
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*
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* This device has 4 USB interfaces:
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*
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* Interface 0 EP 0x81 bootclass mouse, rdesc len 18, report id 0x08,
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* Application(ff00.0001)
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* This interface sends raw event input reports in a custom format, but only
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* after doing the special dance from letsketch_probe(). After enabling this
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* interface the other 3 interfaces are disabled.
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*
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* Interface 1 EP 0x82 bootclass mouse, rdesc len 83, report id 0x0a, Tablet
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* This interface sends absolute events for the pen, including pressure,
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* but only for some part of the active area due to special "aspect ratio"
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* correction and only half by default since it assumes it will be used
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* with a phone in portraid mode, while using the tablet in landscape mode.
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* Also stylus + pad button events are not reported here.
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*
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* Interface 2 EP 0x83 bootclass keybd, rdesc len 64, report id none, Std Kbd
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* This interfaces send various hard-coded key-combos for the pad buttons
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* and "e" keypresses for the 2nd stylus button
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*
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* Interface 3 EP 0x84 bootclass mouse, rdesc len 75, report id 0x01, Std Mouse
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* This reports right-click mouse-button events for the 1st stylus button
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*/
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#include <linux/device.h>
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#include <linux/input.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include <linux/timer.h>
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#include <linux/usb.h>
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#include <asm/unaligned.h>
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#include "hid-ids.h"
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#define LETSKETCH_RAW_IF 0
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#define LETSKETCH_RAW_DATA_LEN 12
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#define LETSKETCH_RAW_REPORT_ID 8
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#define LETSKETCH_PAD_BUTTONS 5
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#define LETSKETCH_INFO_STR_IDX_BEGIN 0xc8
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#define LETSKETCH_INFO_STR_IDX_END 0xca
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#define LETSKETCH_GET_STRING_RETRIES 5
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struct letsketch_data {
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struct hid_device *hdev;
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struct input_dev *input_tablet;
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struct input_dev *input_tablet_pad;
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struct timer_list inrange_timer;
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};
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static int letsketch_open(struct input_dev *dev)
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{
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struct letsketch_data *data = input_get_drvdata(dev);
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return hid_hw_open(data->hdev);
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}
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static void letsketch_close(struct input_dev *dev)
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{
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struct letsketch_data *data = input_get_drvdata(dev);
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hid_hw_close(data->hdev);
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}
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static struct input_dev *letsketch_alloc_input_dev(struct letsketch_data *data)
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{
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struct input_dev *input;
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input = devm_input_allocate_device(&data->hdev->dev);
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if (!input)
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return NULL;
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input->id.bustype = data->hdev->bus;
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input->id.vendor = data->hdev->vendor;
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input->id.product = data->hdev->product;
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input->id.version = data->hdev->bus;
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input->phys = data->hdev->phys;
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input->uniq = data->hdev->uniq;
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input->open = letsketch_open;
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input->close = letsketch_close;
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input_set_drvdata(input, data);
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return input;
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}
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static int letsketch_setup_input_tablet(struct letsketch_data *data)
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{
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struct input_dev *input;
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input = letsketch_alloc_input_dev(data);
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if (!input)
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return -ENOMEM;
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input_set_abs_params(input, ABS_X, 0, 50800, 0, 0);
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input_set_abs_params(input, ABS_Y, 0, 31750, 0, 0);
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input_set_abs_params(input, ABS_PRESSURE, 0, 8192, 0, 0);
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input_abs_set_res(input, ABS_X, 240);
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input_abs_set_res(input, ABS_Y, 225);
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input_set_capability(input, EV_KEY, BTN_TOUCH);
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input_set_capability(input, EV_KEY, BTN_TOOL_PEN);
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input_set_capability(input, EV_KEY, BTN_STYLUS);
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input_set_capability(input, EV_KEY, BTN_STYLUS2);
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/* All known brands selling this tablet use WP9620[N] as model name */
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input->name = "WP9620 Tablet";
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data->input_tablet = input;
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return input_register_device(data->input_tablet);
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}
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static int letsketch_setup_input_tablet_pad(struct letsketch_data *data)
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{
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struct input_dev *input;
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int i;
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input = letsketch_alloc_input_dev(data);
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if (!input)
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return -ENOMEM;
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for (i = 0; i < LETSKETCH_PAD_BUTTONS; i++)
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input_set_capability(input, EV_KEY, BTN_0 + i);
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/*
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* These are never send on the pad input_dev, but must be set
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* on the Pad to make udev / libwacom happy.
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*/
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input_set_abs_params(input, ABS_X, 0, 1, 0, 0);
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input_set_abs_params(input, ABS_Y, 0, 1, 0, 0);
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input_set_capability(input, EV_KEY, BTN_STYLUS);
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input->name = "WP9620 Pad";
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data->input_tablet_pad = input;
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return input_register_device(data->input_tablet_pad);
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}
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static void letsketch_inrange_timeout(struct timer_list *t)
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{
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struct letsketch_data *data = from_timer(data, t, inrange_timer);
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struct input_dev *input = data->input_tablet;
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input_report_key(input, BTN_TOOL_PEN, 0);
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input_sync(input);
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}
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static int letsketch_raw_event(struct hid_device *hdev,
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struct hid_report *report,
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u8 *raw_data, int size)
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{
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struct letsketch_data *data = hid_get_drvdata(hdev);
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struct input_dev *input;
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int i;
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if (size != LETSKETCH_RAW_DATA_LEN || raw_data[0] != LETSKETCH_RAW_REPORT_ID)
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return 0;
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switch (raw_data[1] & 0xf0) {
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case 0x80: /* Pen data */
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input = data->input_tablet;
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input_report_key(input, BTN_TOOL_PEN, 1);
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input_report_key(input, BTN_TOUCH, raw_data[1] & 0x01);
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input_report_key(input, BTN_STYLUS, raw_data[1] & 0x02);
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input_report_key(input, BTN_STYLUS2, raw_data[1] & 0x04);
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input_report_abs(input, ABS_X,
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get_unaligned_le16(raw_data + 2));
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input_report_abs(input, ABS_Y,
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get_unaligned_le16(raw_data + 4));
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input_report_abs(input, ABS_PRESSURE,
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get_unaligned_le16(raw_data + 6));
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/*
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* There is no out of range event, so use a timer for this
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* when in range we get an event approx. every 8 ms.
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*/
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mod_timer(&data->inrange_timer, jiffies + msecs_to_jiffies(100));
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break;
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case 0xe0: /* Pad data */
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input = data->input_tablet_pad;
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for (i = 0; i < LETSKETCH_PAD_BUTTONS; i++)
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input_report_key(input, BTN_0 + i, raw_data[4] == (i + 1));
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break;
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default:
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hid_warn(data->hdev, "Warning unknown data header: 0x%02x\n",
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raw_data[0]);
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return 0;
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}
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input_sync(input);
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return 0;
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}
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/*
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* The tablets magic handshake to put it in raw mode relies on getting
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* string descriptors. But the firmware is buggy and does not like it if
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* we do this too fast. Even if we go slow sometimes the usb_string() call
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* fails. Ignore errors and retry it a couple of times if necessary.
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*/
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static int letsketch_get_string(struct usb_device *udev, int index, char *buf, int size)
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{
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int i, ret;
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for (i = 0; i < LETSKETCH_GET_STRING_RETRIES; i++) {
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usleep_range(5000, 7000);
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ret = usb_string(udev, index, buf, size);
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if (ret > 0)
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return 0;
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}
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dev_err(&udev->dev, "Max retries (%d) exceeded reading string descriptor %d\n",
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LETSKETCH_GET_STRING_RETRIES, index);
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return ret ? ret : -EIO;
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}
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static int letsketch_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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struct device *dev = &hdev->dev;
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struct letsketch_data *data;
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struct usb_interface *intf;
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struct usb_device *udev;
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char buf[256];
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int i, ret;
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if (!hid_is_using_ll_driver(hdev, &usb_hid_driver))
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return -ENODEV;
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intf = to_usb_interface(hdev->dev.parent);
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if (intf->altsetting->desc.bInterfaceNumber != LETSKETCH_RAW_IF)
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return -ENODEV; /* Ignore the other interfaces */
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udev = interface_to_usbdev(intf);
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/*
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* Instead of using a set-feature request, or even a custom USB ctrl
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* message the tablet needs this elaborate magic reading of USB
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* string descriptors to kick it into raw mode. This is what the
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* Windows drivers are seen doing in an USB trace under Windows.
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*/
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for (i = LETSKETCH_INFO_STR_IDX_BEGIN; i <= LETSKETCH_INFO_STR_IDX_END; i++) {
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ret = letsketch_get_string(udev, i, buf, sizeof(buf));
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if (ret)
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return ret;
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hid_info(hdev, "Device info: %s\n", buf);
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}
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for (i = 1; i <= 250; i++) {
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ret = letsketch_get_string(udev, i, buf, sizeof(buf));
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if (ret)
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return ret;
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}
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ret = letsketch_get_string(udev, 0x64, buf, sizeof(buf));
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if (ret)
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return ret;
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ret = letsketch_get_string(udev, LETSKETCH_INFO_STR_IDX_BEGIN, buf, sizeof(buf));
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if (ret)
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return ret;
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/*
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* The tablet should be in raw mode now, end with a final delay before
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* doing further IO to the device.
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*/
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usleep_range(5000, 7000);
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ret = hid_parse(hdev);
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if (ret)
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return ret;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->hdev = hdev;
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timer_setup(&data->inrange_timer, letsketch_inrange_timeout, 0);
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hid_set_drvdata(hdev, data);
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ret = letsketch_setup_input_tablet(data);
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if (ret)
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return ret;
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ret = letsketch_setup_input_tablet_pad(data);
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if (ret)
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return ret;
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return hid_hw_start(hdev, HID_CONNECT_HIDRAW);
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}
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static const struct hid_device_id letsketch_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_LETSKETCH, USB_DEVICE_ID_WP9620N) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, letsketch_devices);
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static struct hid_driver letsketch_driver = {
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.name = "letsketch",
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.id_table = letsketch_devices,
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.probe = letsketch_probe,
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.raw_event = letsketch_raw_event,
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};
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module_hid_driver(letsketch_driver);
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_LICENSE("GPL");
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