From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/hid/hid-elo.c | 316 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 316 insertions(+) create mode 100644 drivers/hid/hid-elo.c (limited to 'drivers/hid/hid-elo.c') diff --git a/drivers/hid/hid-elo.c b/drivers/hid/hid-elo.c new file mode 100644 index 0000000000..2876cb6a7d --- /dev/null +++ b/drivers/hid/hid-elo.c @@ -0,0 +1,316 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * HID driver for ELO usb touchscreen 4000/4500 + * + * Copyright (c) 2013 Jiri Slaby + * + * Data parsing taken from elousb driver by Vojtech Pavlik. + */ + +#include +#include +#include +#include +#include + +#include "hid-ids.h" + +#define ELO_PERIODIC_READ_INTERVAL HZ +#define ELO_SMARTSET_CMD_TIMEOUT 2000 /* msec */ + +/* Elo SmartSet commands */ +#define ELO_FLUSH_SMARTSET_RESPONSES 0x02 /* Flush all pending smartset responses */ +#define ELO_SEND_SMARTSET_COMMAND 0x05 /* Send a smartset command */ +#define ELO_GET_SMARTSET_RESPONSE 0x06 /* Get a smartset response */ +#define ELO_DIAG 0x64 /* Diagnostics command */ +#define ELO_SMARTSET_PACKET_SIZE 8 + +struct elo_priv { + struct usb_device *usbdev; + struct delayed_work work; + unsigned char buffer[ELO_SMARTSET_PACKET_SIZE]; +}; + +static struct workqueue_struct *wq; +static bool use_fw_quirk = true; +module_param(use_fw_quirk, bool, S_IRUGO); +MODULE_PARM_DESC(use_fw_quirk, "Do periodic pokes for broken M firmwares (default = true)"); + +static int elo_input_configured(struct hid_device *hdev, + struct hid_input *hidinput) +{ + struct input_dev *input = hidinput->input; + + /* + * ELO devices have one Button usage in GenDesk field, which makes + * hid-input map it to BTN_LEFT; that confuses userspace, which then + * considers the device to be a mouse/touchpad instead of touchscreen. + */ + clear_bit(BTN_LEFT, input->keybit); + set_bit(BTN_TOUCH, input->keybit); + set_bit(ABS_PRESSURE, input->absbit); + input_set_abs_params(input, ABS_PRESSURE, 0, 256, 0, 0); + + return 0; +} + +static void elo_process_data(struct input_dev *input, const u8 *data, int size) +{ + int press; + + input_report_abs(input, ABS_X, (data[3] << 8) | data[2]); + input_report_abs(input, ABS_Y, (data[5] << 8) | data[4]); + + press = 0; + if (data[1] & 0x80) + press = (data[7] << 8) | data[6]; + input_report_abs(input, ABS_PRESSURE, press); + + if (data[1] & 0x03) { + input_report_key(input, BTN_TOUCH, 1); + input_sync(input); + } + + if (data[1] & 0x04) + input_report_key(input, BTN_TOUCH, 0); + + input_sync(input); +} + +static int elo_raw_event(struct hid_device *hdev, struct hid_report *report, + u8 *data, int size) +{ + struct hid_input *hidinput; + + if (!(hdev->claimed & HID_CLAIMED_INPUT) || list_empty(&hdev->inputs)) + return 0; + + hidinput = list_first_entry(&hdev->inputs, struct hid_input, list); + + switch (report->id) { + case 0: + if (data[0] == 'T') { /* Mandatory ELO packet marker */ + elo_process_data(hidinput->input, data, size); + return 1; + } + break; + default: /* unknown report */ + /* Unknown report type; pass upstream */ + hid_info(hdev, "unknown report type %d\n", report->id); + break; + } + + return 0; +} + +static int elo_smartset_send_get(struct usb_device *dev, u8 command, + void *data) +{ + unsigned int pipe; + u8 dir; + + if (command == ELO_SEND_SMARTSET_COMMAND) { + pipe = usb_sndctrlpipe(dev, 0); + dir = USB_DIR_OUT; + } else if (command == ELO_GET_SMARTSET_RESPONSE) { + pipe = usb_rcvctrlpipe(dev, 0); + dir = USB_DIR_IN; + } else + return -EINVAL; + + return usb_control_msg(dev, pipe, command, + dir | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + 0, 0, data, ELO_SMARTSET_PACKET_SIZE, + ELO_SMARTSET_CMD_TIMEOUT); +} + +static int elo_flush_smartset_responses(struct usb_device *dev) +{ + return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), + ELO_FLUSH_SMARTSET_RESPONSES, + USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + 0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT); +} + +static void elo_work(struct work_struct *work) +{ + struct elo_priv *priv = container_of(work, struct elo_priv, work.work); + struct usb_device *dev = priv->usbdev; + unsigned char *buffer = priv->buffer; + int ret; + + ret = elo_flush_smartset_responses(dev); + if (ret < 0) { + dev_err(&dev->dev, "initial FLUSH_SMARTSET_RESPONSES failed, error %d\n", + ret); + goto fail; + } + + /* send Diagnostics command */ + *buffer = ELO_DIAG; + ret = elo_smartset_send_get(dev, ELO_SEND_SMARTSET_COMMAND, buffer); + if (ret < 0) { + dev_err(&dev->dev, "send Diagnostics Command failed, error %d\n", + ret); + goto fail; + } + + /* get the result */ + ret = elo_smartset_send_get(dev, ELO_GET_SMARTSET_RESPONSE, buffer); + if (ret < 0) { + dev_err(&dev->dev, "get Diagnostics Command response failed, error %d\n", + ret); + goto fail; + } + + /* read the ack */ + if (*buffer != 'A') { + ret = elo_smartset_send_get(dev, ELO_GET_SMARTSET_RESPONSE, + buffer); + if (ret < 0) { + dev_err(&dev->dev, "get acknowledge response failed, error %d\n", + ret); + goto fail; + } + } + +fail: + ret = elo_flush_smartset_responses(dev); + if (ret < 0) + dev_err(&dev->dev, "final FLUSH_SMARTSET_RESPONSES failed, error %d\n", + ret); + queue_delayed_work(wq, &priv->work, ELO_PERIODIC_READ_INTERVAL); +} + +/* + * Not all Elo devices need the periodic HID descriptor reads. + * Only firmware version M needs this. + */ +static bool elo_broken_firmware(struct usb_device *dev) +{ + struct usb_device *hub = dev->parent; + struct usb_device *child = NULL; + u16 fw_lvl = le16_to_cpu(dev->descriptor.bcdDevice); + u16 child_vid, child_pid; + int i; + + if (!use_fw_quirk) + return false; + if (fw_lvl != 0x10d) + return false; + + /* iterate sibling devices of the touch controller */ + usb_hub_for_each_child(hub, i, child) { + child_vid = le16_to_cpu(child->descriptor.idVendor); + child_pid = le16_to_cpu(child->descriptor.idProduct); + + /* + * If one of the devices below is present attached as a sibling of + * the touch controller then this is a newer IBM 4820 monitor that + * does not need the IBM-requested workaround if fw level is + * 0x010d - aka 'M'. + * No other HW can have this combination. + */ + if (child_vid==0x04b3) { + switch (child_pid) { + case 0x4676: /* 4820 21x Video */ + case 0x4677: /* 4820 51x Video */ + case 0x4678: /* 4820 2Lx Video */ + case 0x4679: /* 4820 5Lx Video */ + return false; + } + } + } + return true; +} + +static int elo_probe(struct hid_device *hdev, const struct hid_device_id *id) +{ + struct elo_priv *priv; + int ret; + + if (!hid_is_usb(hdev)) + return -EINVAL; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + INIT_DELAYED_WORK(&priv->work, elo_work); + priv->usbdev = interface_to_usbdev(to_usb_interface(hdev->dev.parent)); + + hid_set_drvdata(hdev, priv); + + ret = hid_parse(hdev); + if (ret) { + hid_err(hdev, "parse failed\n"); + goto err_free; + } + + ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); + if (ret) { + hid_err(hdev, "hw start failed\n"); + goto err_free; + } + + if (elo_broken_firmware(priv->usbdev)) { + hid_info(hdev, "broken firmware found, installing workaround\n"); + queue_delayed_work(wq, &priv->work, ELO_PERIODIC_READ_INTERVAL); + } + + return 0; +err_free: + kfree(priv); + return ret; +} + +static void elo_remove(struct hid_device *hdev) +{ + struct elo_priv *priv = hid_get_drvdata(hdev); + + hid_hw_stop(hdev); + cancel_delayed_work_sync(&priv->work); + kfree(priv); +} + +static const struct hid_device_id elo_devices[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_ELO, 0x0009), }, + { HID_USB_DEVICE(USB_VENDOR_ID_ELO, 0x0030), }, + { } +}; +MODULE_DEVICE_TABLE(hid, elo_devices); + +static struct hid_driver elo_driver = { + .name = "elo", + .id_table = elo_devices, + .probe = elo_probe, + .remove = elo_remove, + .raw_event = elo_raw_event, + .input_configured = elo_input_configured, +}; + +static int __init elo_driver_init(void) +{ + int ret; + + wq = create_singlethread_workqueue("elousb"); + if (!wq) + return -ENOMEM; + + ret = hid_register_driver(&elo_driver); + if (ret) + destroy_workqueue(wq); + + return ret; +} +module_init(elo_driver_init); + +static void __exit elo_driver_exit(void) +{ + hid_unregister_driver(&elo_driver); + destroy_workqueue(wq); +} +module_exit(elo_driver_exit); + +MODULE_AUTHOR("Jiri Slaby "); +MODULE_LICENSE("GPL"); -- cgit v1.2.3