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-rw-r--r--drivers/hid/hid-uclogic-params.c1862
1 files changed, 1862 insertions, 0 deletions
diff --git a/drivers/hid/hid-uclogic-params.c b/drivers/hid/hid-uclogic-params.c
new file mode 100644
index 0000000000..9859dad364
--- /dev/null
+++ b/drivers/hid/hid-uclogic-params.c
@@ -0,0 +1,1862 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * HID driver for UC-Logic devices not fully compliant with HID standard
+ * - tablet initialization and parameter retrieval
+ *
+ * Copyright (c) 2018 Nikolai Kondrashov
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include "hid-uclogic-params.h"
+#include "hid-uclogic-rdesc.h"
+#include "usbhid/usbhid.h"
+#include "hid-ids.h"
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <asm/unaligned.h>
+
+/**
+ * uclogic_params_pen_inrange_to_str() - Convert a pen in-range reporting type
+ * to a string.
+ * @inrange: The in-range reporting type to convert.
+ *
+ * Return:
+ * * The string representing the type, or
+ * * %NULL if the type is unknown.
+ */
+static const char *uclogic_params_pen_inrange_to_str(
+ enum uclogic_params_pen_inrange inrange)
+{
+ switch (inrange) {
+ case UCLOGIC_PARAMS_PEN_INRANGE_NORMAL:
+ return "normal";
+ case UCLOGIC_PARAMS_PEN_INRANGE_INVERTED:
+ return "inverted";
+ case UCLOGIC_PARAMS_PEN_INRANGE_NONE:
+ return "none";
+ default:
+ return NULL;
+ }
+}
+
+/**
+ * uclogic_params_pen_hid_dbg() - Dump tablet interface pen parameters
+ * @hdev: The HID device the pen parameters describe.
+ * @pen: The pen parameters to dump.
+ *
+ * Dump tablet interface pen parameters with hid_dbg(). The dump is indented
+ * with a tab.
+ */
+static void uclogic_params_pen_hid_dbg(const struct hid_device *hdev,
+ const struct uclogic_params_pen *pen)
+{
+ size_t i;
+
+ hid_dbg(hdev, "\t.usage_invalid = %s\n",
+ (pen->usage_invalid ? "true" : "false"));
+ hid_dbg(hdev, "\t.desc_ptr = %p\n", pen->desc_ptr);
+ hid_dbg(hdev, "\t.desc_size = %u\n", pen->desc_size);
+ hid_dbg(hdev, "\t.id = %u\n", pen->id);
+ hid_dbg(hdev, "\t.subreport_list = {\n");
+ for (i = 0; i < ARRAY_SIZE(pen->subreport_list); i++) {
+ hid_dbg(hdev, "\t\t{0x%02hhx, %hhu}%s\n",
+ pen->subreport_list[i].value,
+ pen->subreport_list[i].id,
+ i < (ARRAY_SIZE(pen->subreport_list) - 1) ? "," : "");
+ }
+ hid_dbg(hdev, "\t}\n");
+ hid_dbg(hdev, "\t.inrange = %s\n",
+ uclogic_params_pen_inrange_to_str(pen->inrange));
+ hid_dbg(hdev, "\t.fragmented_hires = %s\n",
+ (pen->fragmented_hires ? "true" : "false"));
+ hid_dbg(hdev, "\t.tilt_y_flipped = %s\n",
+ (pen->tilt_y_flipped ? "true" : "false"));
+}
+
+/**
+ * uclogic_params_frame_hid_dbg() - Dump tablet interface frame parameters
+ * @hdev: The HID device the pen parameters describe.
+ * @frame: The frame parameters to dump.
+ *
+ * Dump tablet interface frame parameters with hid_dbg(). The dump is
+ * indented with two tabs.
+ */
+static void uclogic_params_frame_hid_dbg(
+ const struct hid_device *hdev,
+ const struct uclogic_params_frame *frame)
+{
+ hid_dbg(hdev, "\t\t.desc_ptr = %p\n", frame->desc_ptr);
+ hid_dbg(hdev, "\t\t.desc_size = %u\n", frame->desc_size);
+ hid_dbg(hdev, "\t\t.id = %u\n", frame->id);
+ hid_dbg(hdev, "\t\t.suffix = %s\n", frame->suffix);
+ hid_dbg(hdev, "\t\t.re_lsb = %u\n", frame->re_lsb);
+ hid_dbg(hdev, "\t\t.dev_id_byte = %u\n", frame->dev_id_byte);
+ hid_dbg(hdev, "\t\t.touch_byte = %u\n", frame->touch_byte);
+ hid_dbg(hdev, "\t\t.touch_max = %hhd\n", frame->touch_max);
+ hid_dbg(hdev, "\t\t.touch_flip_at = %hhd\n",
+ frame->touch_flip_at);
+ hid_dbg(hdev, "\t\t.bitmap_dial_byte = %u\n",
+ frame->bitmap_dial_byte);
+}
+
+/**
+ * uclogic_params_hid_dbg() - Dump tablet interface parameters
+ * @hdev: The HID device the parameters describe.
+ * @params: The parameters to dump.
+ *
+ * Dump tablet interface parameters with hid_dbg().
+ */
+void uclogic_params_hid_dbg(const struct hid_device *hdev,
+ const struct uclogic_params *params)
+{
+ size_t i;
+
+ hid_dbg(hdev, ".invalid = %s\n",
+ params->invalid ? "true" : "false");
+ hid_dbg(hdev, ".desc_ptr = %p\n", params->desc_ptr);
+ hid_dbg(hdev, ".desc_size = %u\n", params->desc_size);
+ hid_dbg(hdev, ".pen = {\n");
+ uclogic_params_pen_hid_dbg(hdev, &params->pen);
+ hid_dbg(hdev, "\t}\n");
+ hid_dbg(hdev, ".frame_list = {\n");
+ for (i = 0; i < ARRAY_SIZE(params->frame_list); i++) {
+ hid_dbg(hdev, "\t{\n");
+ uclogic_params_frame_hid_dbg(hdev, &params->frame_list[i]);
+ hid_dbg(hdev, "\t}%s\n",
+ i < (ARRAY_SIZE(params->frame_list) - 1) ? "," : "");
+ }
+ hid_dbg(hdev, "}\n");
+}
+
+/**
+ * uclogic_params_get_str_desc - retrieve a string descriptor from a HID
+ * device interface, putting it into a kmalloc-allocated buffer as is, without
+ * character encoding conversion.
+ *
+ * @pbuf: Location for the kmalloc-allocated buffer pointer containing
+ * the retrieved descriptor. Not modified in case of error.
+ * Can be NULL to have retrieved descriptor discarded.
+ * @hdev: The HID device of the tablet interface to retrieve the string
+ * descriptor from. Cannot be NULL.
+ * @idx: Index of the string descriptor to request from the device.
+ * @len: Length of the buffer to allocate and the data to retrieve.
+ *
+ * Returns:
+ * number of bytes retrieved (<= len),
+ * -EPIPE, if the descriptor was not found, or
+ * another negative errno code in case of other error.
+ */
+static int uclogic_params_get_str_desc(__u8 **pbuf, struct hid_device *hdev,
+ __u8 idx, size_t len)
+{
+ int rc;
+ struct usb_device *udev;
+ __u8 *buf = NULL;
+
+ /* Check arguments */
+ if (hdev == NULL) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ udev = hid_to_usb_dev(hdev);
+
+ buf = kmalloc(len, GFP_KERNEL);
+ if (buf == NULL) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+
+ rc = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
+ USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
+ (USB_DT_STRING << 8) + idx,
+ 0x0409, buf, len,
+ USB_CTRL_GET_TIMEOUT);
+ if (rc == -EPIPE) {
+ hid_dbg(hdev, "string descriptor #%hhu not found\n", idx);
+ goto cleanup;
+ } else if (rc < 0) {
+ hid_err(hdev,
+ "failed retrieving string descriptor #%u: %d\n",
+ idx, rc);
+ goto cleanup;
+ }
+
+ if (pbuf != NULL) {
+ *pbuf = buf;
+ buf = NULL;
+ }
+
+cleanup:
+ kfree(buf);
+ return rc;
+}
+
+/**
+ * uclogic_params_pen_cleanup - free resources used by struct
+ * uclogic_params_pen (tablet interface's pen input parameters).
+ * Can be called repeatedly.
+ *
+ * @pen: Pen input parameters to cleanup. Cannot be NULL.
+ */
+static void uclogic_params_pen_cleanup(struct uclogic_params_pen *pen)
+{
+ kfree(pen->desc_ptr);
+ memset(pen, 0, sizeof(*pen));
+}
+
+/**
+ * uclogic_params_pen_init_v1() - initialize tablet interface pen
+ * input and retrieve its parameters from the device, using v1 protocol.
+ *
+ * @pen: Pointer to the pen parameters to initialize (to be
+ * cleaned up with uclogic_params_pen_cleanup()). Not modified in
+ * case of error, or if parameters are not found. Cannot be NULL.
+ * @pfound: Location for a flag which is set to true if the parameters
+ * were found, and to false if not (e.g. device was
+ * incompatible). Not modified in case of error. Cannot be NULL.
+ * @hdev: The HID device of the tablet interface to initialize and get
+ * parameters from. Cannot be NULL.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_pen_init_v1(struct uclogic_params_pen *pen,
+ bool *pfound,
+ struct hid_device *hdev)
+{
+ int rc;
+ bool found = false;
+ /* Buffer for (part of) the string descriptor */
+ __u8 *buf = NULL;
+ /* Minimum descriptor length required, maximum seen so far is 18 */
+ const int len = 12;
+ s32 resolution;
+ /* Pen report descriptor template parameters */
+ s32 desc_params[UCLOGIC_RDESC_PH_ID_NUM];
+ __u8 *desc_ptr = NULL;
+
+ /* Check arguments */
+ if (pen == NULL || pfound == NULL || hdev == NULL) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ /*
+ * Read string descriptor containing pen input parameters.
+ * The specific string descriptor and data were discovered by sniffing
+ * the Windows driver traffic.
+ * NOTE: This enables fully-functional tablet mode.
+ */
+ rc = uclogic_params_get_str_desc(&buf, hdev, 100, len);
+ if (rc == -EPIPE) {
+ hid_dbg(hdev,
+ "string descriptor with pen parameters not found, assuming not compatible\n");
+ goto finish;
+ } else if (rc < 0) {
+ hid_err(hdev, "failed retrieving pen parameters: %d\n", rc);
+ goto cleanup;
+ } else if (rc != len) {
+ hid_dbg(hdev,
+ "string descriptor with pen parameters has invalid length (got %d, expected %d), assuming not compatible\n",
+ rc, len);
+ goto finish;
+ }
+
+ /*
+ * Fill report descriptor parameters from the string descriptor
+ */
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_LM] =
+ get_unaligned_le16(buf + 2);
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_LM] =
+ get_unaligned_le16(buf + 4);
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM] =
+ get_unaligned_le16(buf + 8);
+ resolution = get_unaligned_le16(buf + 10);
+ if (resolution == 0) {
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_PM] = 0;
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_PM] = 0;
+ } else {
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_PM] =
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_LM] * 1000 /
+ resolution;
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_PM] =
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_LM] * 1000 /
+ resolution;
+ }
+ kfree(buf);
+ buf = NULL;
+
+ /*
+ * Generate pen report descriptor
+ */
+ desc_ptr = uclogic_rdesc_template_apply(
+ uclogic_rdesc_v1_pen_template_arr,
+ uclogic_rdesc_v1_pen_template_size,
+ desc_params, ARRAY_SIZE(desc_params));
+ if (desc_ptr == NULL) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+
+ /*
+ * Fill-in the parameters
+ */
+ memset(pen, 0, sizeof(*pen));
+ pen->desc_ptr = desc_ptr;
+ desc_ptr = NULL;
+ pen->desc_size = uclogic_rdesc_v1_pen_template_size;
+ pen->id = UCLOGIC_RDESC_V1_PEN_ID;
+ pen->inrange = UCLOGIC_PARAMS_PEN_INRANGE_INVERTED;
+ found = true;
+finish:
+ *pfound = found;
+ rc = 0;
+cleanup:
+ kfree(desc_ptr);
+ kfree(buf);
+ return rc;
+}
+
+/**
+ * uclogic_params_get_le24() - get a 24-bit little-endian number from a
+ * buffer.
+ *
+ * @p: The pointer to the number buffer.
+ *
+ * Returns:
+ * The retrieved number
+ */
+static s32 uclogic_params_get_le24(const void *p)
+{
+ const __u8 *b = p;
+ return b[0] | (b[1] << 8UL) | (b[2] << 16UL);
+}
+
+/**
+ * uclogic_params_pen_init_v2() - initialize tablet interface pen
+ * input and retrieve its parameters from the device, using v2 protocol.
+ *
+ * @pen: Pointer to the pen parameters to initialize (to be
+ * cleaned up with uclogic_params_pen_cleanup()). Not
+ * modified in case of error, or if parameters are not
+ * found. Cannot be NULL.
+ * @pfound: Location for a flag which is set to true if the
+ * parameters were found, and to false if not (e.g.
+ * device was incompatible). Not modified in case of
+ * error. Cannot be NULL.
+ * @pparams_ptr: Location for a kmalloc'ed pointer to the retrieved raw
+ * parameters, which could be used to identify the tablet
+ * to some extent. Should be freed with kfree after use.
+ * NULL, if not needed. Not modified in case of error.
+ * Only set if *pfound is set to true.
+ * @pparams_len: Location for the length of the retrieved raw
+ * parameters. NULL, if not needed. Not modified in case
+ * of error. Only set if *pfound is set to true.
+ * @hdev: The HID device of the tablet interface to initialize
+ * and get parameters from. Cannot be NULL.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_pen_init_v2(struct uclogic_params_pen *pen,
+ bool *pfound,
+ __u8 **pparams_ptr,
+ size_t *pparams_len,
+ struct hid_device *hdev)
+{
+ int rc;
+ bool found = false;
+ /* Buffer for (part of) the parameter string descriptor */
+ __u8 *buf = NULL;
+ /* Parameter string descriptor required length */
+ const int params_len_min = 18;
+ /* Parameter string descriptor accepted length */
+ const int params_len_max = 32;
+ /* Parameter string descriptor received length */
+ int params_len;
+ size_t i;
+ s32 resolution;
+ /* Pen report descriptor template parameters */
+ s32 desc_params[UCLOGIC_RDESC_PH_ID_NUM];
+ __u8 *desc_ptr = NULL;
+
+ /* Check arguments */
+ if (pen == NULL || pfound == NULL || hdev == NULL) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ /*
+ * Read string descriptor containing pen input parameters.
+ * The specific string descriptor and data were discovered by sniffing
+ * the Windows driver traffic.
+ * NOTE: This enables fully-functional tablet mode.
+ */
+ rc = uclogic_params_get_str_desc(&buf, hdev, 200, params_len_max);
+ if (rc == -EPIPE) {
+ hid_dbg(hdev,
+ "string descriptor with pen parameters not found, assuming not compatible\n");
+ goto finish;
+ } else if (rc < 0) {
+ hid_err(hdev, "failed retrieving pen parameters: %d\n", rc);
+ goto cleanup;
+ } else if (rc < params_len_min) {
+ hid_dbg(hdev,
+ "string descriptor with pen parameters is too short (got %d, expected at least %d), assuming not compatible\n",
+ rc, params_len_min);
+ goto finish;
+ }
+
+ params_len = rc;
+
+ /*
+ * Check it's not just a catch-all UTF-16LE-encoded ASCII
+ * string (such as the model name) some tablets put into all
+ * unknown string descriptors.
+ */
+ for (i = 2;
+ i < params_len &&
+ (buf[i] >= 0x20 && buf[i] < 0x7f && buf[i + 1] == 0);
+ i += 2);
+ if (i >= params_len) {
+ hid_dbg(hdev,
+ "string descriptor with pen parameters seems to contain only text, assuming not compatible\n");
+ goto finish;
+ }
+
+ /*
+ * Fill report descriptor parameters from the string descriptor
+ */
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_LM] =
+ uclogic_params_get_le24(buf + 2);
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_LM] =
+ uclogic_params_get_le24(buf + 5);
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM] =
+ get_unaligned_le16(buf + 8);
+ resolution = get_unaligned_le16(buf + 10);
+ if (resolution == 0) {
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_PM] = 0;
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_PM] = 0;
+ } else {
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_PM] =
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_LM] * 1000 /
+ resolution;
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_PM] =
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_LM] * 1000 /
+ resolution;
+ }
+
+ /*
+ * Generate pen report descriptor
+ */
+ desc_ptr = uclogic_rdesc_template_apply(
+ uclogic_rdesc_v2_pen_template_arr,
+ uclogic_rdesc_v2_pen_template_size,
+ desc_params, ARRAY_SIZE(desc_params));
+ if (desc_ptr == NULL) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+
+ /*
+ * Fill-in the parameters
+ */
+ memset(pen, 0, sizeof(*pen));
+ pen->desc_ptr = desc_ptr;
+ desc_ptr = NULL;
+ pen->desc_size = uclogic_rdesc_v2_pen_template_size;
+ pen->id = UCLOGIC_RDESC_V2_PEN_ID;
+ pen->inrange = UCLOGIC_PARAMS_PEN_INRANGE_NONE;
+ pen->fragmented_hires = true;
+ pen->tilt_y_flipped = true;
+ found = true;
+ if (pparams_ptr != NULL) {
+ *pparams_ptr = buf;
+ buf = NULL;
+ }
+ if (pparams_len != NULL)
+ *pparams_len = params_len;
+
+finish:
+ *pfound = found;
+ rc = 0;
+cleanup:
+ kfree(desc_ptr);
+ kfree(buf);
+ return rc;
+}
+
+/**
+ * uclogic_params_frame_cleanup - free resources used by struct
+ * uclogic_params_frame (tablet interface's frame controls input parameters).
+ * Can be called repeatedly.
+ *
+ * @frame: Frame controls input parameters to cleanup. Cannot be NULL.
+ */
+static void uclogic_params_frame_cleanup(struct uclogic_params_frame *frame)
+{
+ kfree(frame->desc_ptr);
+ memset(frame, 0, sizeof(*frame));
+}
+
+/**
+ * uclogic_params_frame_init_with_desc() - initialize tablet's frame control
+ * parameters with a static report descriptor.
+ *
+ * @frame: Pointer to the frame parameters to initialize (to be cleaned
+ * up with uclogic_params_frame_cleanup()). Not modified in case
+ * of error. Cannot be NULL.
+ * @desc_ptr: Report descriptor pointer. Can be NULL, if desc_size is zero.
+ * @desc_size: Report descriptor size.
+ * @id: Report ID used for frame reports, if they should be tweaked,
+ * zero if not.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_frame_init_with_desc(
+ struct uclogic_params_frame *frame,
+ const __u8 *desc_ptr,
+ size_t desc_size,
+ unsigned int id)
+{
+ __u8 *copy_desc_ptr;
+
+ if (frame == NULL || (desc_ptr == NULL && desc_size != 0))
+ return -EINVAL;
+
+ copy_desc_ptr = kmemdup(desc_ptr, desc_size, GFP_KERNEL);
+ if (copy_desc_ptr == NULL)
+ return -ENOMEM;
+
+ memset(frame, 0, sizeof(*frame));
+ frame->desc_ptr = copy_desc_ptr;
+ frame->desc_size = desc_size;
+ frame->id = id;
+ return 0;
+}
+
+/**
+ * uclogic_params_frame_init_v1() - initialize v1 tablet interface frame
+ * controls.
+ *
+ * @frame: Pointer to the frame parameters to initialize (to be cleaned
+ * up with uclogic_params_frame_cleanup()). Not modified in case
+ * of error, or if parameters are not found. Cannot be NULL.
+ * @pfound: Location for a flag which is set to true if the parameters
+ * were found, and to false if not (e.g. device was
+ * incompatible). Not modified in case of error. Cannot be NULL.
+ * @hdev: The HID device of the tablet interface to initialize and get
+ * parameters from. Cannot be NULL.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_frame_init_v1(struct uclogic_params_frame *frame,
+ bool *pfound,
+ struct hid_device *hdev)
+{
+ int rc;
+ bool found = false;
+ struct usb_device *usb_dev;
+ char *str_buf = NULL;
+ const size_t str_len = 16;
+
+ /* Check arguments */
+ if (frame == NULL || pfound == NULL || hdev == NULL) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ usb_dev = hid_to_usb_dev(hdev);
+
+ /*
+ * Enable generic button mode
+ */
+ str_buf = kzalloc(str_len, GFP_KERNEL);
+ if (str_buf == NULL) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+
+ rc = usb_string(usb_dev, 123, str_buf, str_len);
+ if (rc == -EPIPE) {
+ hid_dbg(hdev,
+ "generic button -enabling string descriptor not found\n");
+ } else if (rc < 0) {
+ goto cleanup;
+ } else if (strncmp(str_buf, "HK On", rc) != 0) {
+ hid_dbg(hdev,
+ "invalid response to enabling generic buttons: \"%s\"\n",
+ str_buf);
+ } else {
+ hid_dbg(hdev, "generic buttons enabled\n");
+ rc = uclogic_params_frame_init_with_desc(
+ frame,
+ uclogic_rdesc_v1_frame_arr,
+ uclogic_rdesc_v1_frame_size,
+ UCLOGIC_RDESC_V1_FRAME_ID);
+ if (rc != 0)
+ goto cleanup;
+ found = true;
+ }
+
+ *pfound = found;
+ rc = 0;
+cleanup:
+ kfree(str_buf);
+ return rc;
+}
+
+/**
+ * uclogic_params_cleanup_event_hooks - free resources used by the list of raw
+ * event hooks.
+ * Can be called repeatedly.
+ *
+ * @params: Input parameters to cleanup. Cannot be NULL.
+ */
+static void uclogic_params_cleanup_event_hooks(struct uclogic_params *params)
+{
+ struct uclogic_raw_event_hook *curr, *n;
+
+ if (!params || !params->event_hooks)
+ return;
+
+ list_for_each_entry_safe(curr, n, &params->event_hooks->list, list) {
+ cancel_work_sync(&curr->work);
+ list_del(&curr->list);
+ kfree(curr->event);
+ kfree(curr);
+ }
+
+ kfree(params->event_hooks);
+ params->event_hooks = NULL;
+}
+
+/**
+ * uclogic_params_cleanup - free resources used by struct uclogic_params
+ * (tablet interface's parameters).
+ * Can be called repeatedly.
+ *
+ * @params: Input parameters to cleanup. Cannot be NULL.
+ */
+void uclogic_params_cleanup(struct uclogic_params *params)
+{
+ if (!params->invalid) {
+ size_t i;
+ kfree(params->desc_ptr);
+ uclogic_params_pen_cleanup(&params->pen);
+ for (i = 0; i < ARRAY_SIZE(params->frame_list); i++)
+ uclogic_params_frame_cleanup(&params->frame_list[i]);
+
+ uclogic_params_cleanup_event_hooks(params);
+ memset(params, 0, sizeof(*params));
+ }
+}
+
+/**
+ * uclogic_params_get_desc() - Get a replacement report descriptor for a
+ * tablet's interface.
+ *
+ * @params: The parameters of a tablet interface to get report
+ * descriptor for. Cannot be NULL.
+ * @pdesc: Location for the resulting, kmalloc-allocated report
+ * descriptor pointer, or for NULL, if there's no replacement
+ * report descriptor. Not modified in case of error. Cannot be
+ * NULL.
+ * @psize: Location for the resulting report descriptor size, not set if
+ * there's no replacement report descriptor. Not modified in case
+ * of error. Cannot be NULL.
+ *
+ * Returns:
+ * Zero, if successful.
+ * -EINVAL, if invalid arguments are supplied.
+ * -ENOMEM, if failed to allocate memory.
+ */
+int uclogic_params_get_desc(const struct uclogic_params *params,
+ __u8 **pdesc,
+ unsigned int *psize)
+{
+ int rc = -ENOMEM;
+ bool present = false;
+ unsigned int size = 0;
+ __u8 *desc = NULL;
+ size_t i;
+
+ /* Check arguments */
+ if (params == NULL || pdesc == NULL || psize == NULL)
+ return -EINVAL;
+
+ /* Concatenate descriptors */
+#define ADD_DESC(_desc_ptr, _desc_size) \
+ do { \
+ unsigned int new_size; \
+ __u8 *new_desc; \
+ if ((_desc_ptr) == NULL) { \
+ break; \
+ } \
+ new_size = size + (_desc_size); \
+ new_desc = krealloc(desc, new_size, GFP_KERNEL); \
+ if (new_desc == NULL) { \
+ goto cleanup; \
+ } \
+ memcpy(new_desc + size, (_desc_ptr), (_desc_size)); \
+ desc = new_desc; \
+ size = new_size; \
+ present = true; \
+ } while (0)
+
+ ADD_DESC(params->desc_ptr, params->desc_size);
+ ADD_DESC(params->pen.desc_ptr, params->pen.desc_size);
+ for (i = 0; i < ARRAY_SIZE(params->frame_list); i++) {
+ ADD_DESC(params->frame_list[i].desc_ptr,
+ params->frame_list[i].desc_size);
+ }
+
+#undef ADD_DESC
+
+ if (present) {
+ *pdesc = desc;
+ *psize = size;
+ desc = NULL;
+ }
+ rc = 0;
+cleanup:
+ kfree(desc);
+ return rc;
+}
+
+/**
+ * uclogic_params_init_invalid() - initialize tablet interface parameters,
+ * specifying the interface is invalid.
+ *
+ * @params: Parameters to initialize (to be cleaned with
+ * uclogic_params_cleanup()). Cannot be NULL.
+ */
+static void uclogic_params_init_invalid(struct uclogic_params *params)
+{
+ params->invalid = true;
+}
+
+/**
+ * uclogic_params_init_with_opt_desc() - initialize tablet interface
+ * parameters with an optional replacement report descriptor. Only modify
+ * report descriptor, if the original report descriptor matches the expected
+ * size.
+ *
+ * @params: Parameters to initialize (to be cleaned with
+ * uclogic_params_cleanup()). Not modified in case of
+ * error. Cannot be NULL.
+ * @hdev: The HID device of the tablet interface create the
+ * parameters for. Cannot be NULL.
+ * @orig_desc_size: Expected size of the original report descriptor to
+ * be replaced.
+ * @desc_ptr: Pointer to the replacement report descriptor.
+ * Can be NULL, if desc_size is zero.
+ * @desc_size: Size of the replacement report descriptor.
+ *
+ * Returns:
+ * Zero, if successful. -EINVAL if an invalid argument was passed.
+ * -ENOMEM, if failed to allocate memory.
+ */
+static int uclogic_params_init_with_opt_desc(struct uclogic_params *params,
+ struct hid_device *hdev,
+ unsigned int orig_desc_size,
+ __u8 *desc_ptr,
+ unsigned int desc_size)
+{
+ __u8 *desc_copy_ptr = NULL;
+ unsigned int desc_copy_size;
+ int rc;
+
+ /* Check arguments */
+ if (params == NULL || hdev == NULL ||
+ (desc_ptr == NULL && desc_size != 0)) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ /* Replace report descriptor, if it matches */
+ if (hdev->dev_rsize == orig_desc_size) {
+ hid_dbg(hdev,
+ "device report descriptor matches the expected size, replacing\n");
+ desc_copy_ptr = kmemdup(desc_ptr, desc_size, GFP_KERNEL);
+ if (desc_copy_ptr == NULL) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+ desc_copy_size = desc_size;
+ } else {
+ hid_dbg(hdev,
+ "device report descriptor doesn't match the expected size (%u != %u), preserving\n",
+ hdev->dev_rsize, orig_desc_size);
+ desc_copy_ptr = NULL;
+ desc_copy_size = 0;
+ }
+
+ /* Output parameters */
+ memset(params, 0, sizeof(*params));
+ params->desc_ptr = desc_copy_ptr;
+ desc_copy_ptr = NULL;
+ params->desc_size = desc_copy_size;
+
+ rc = 0;
+cleanup:
+ kfree(desc_copy_ptr);
+ return rc;
+}
+
+/**
+ * uclogic_params_huion_init() - initialize a Huion tablet interface and discover
+ * its parameters.
+ *
+ * @params: Parameters to fill in (to be cleaned with
+ * uclogic_params_cleanup()). Not modified in case of error.
+ * Cannot be NULL.
+ * @hdev: The HID device of the tablet interface to initialize and get
+ * parameters from. Cannot be NULL.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_huion_init(struct uclogic_params *params,
+ struct hid_device *hdev)
+{
+ int rc;
+ struct usb_device *udev;
+ struct usb_interface *iface;
+ __u8 bInterfaceNumber;
+ bool found;
+ /* The resulting parameters (noop) */
+ struct uclogic_params p = {0, };
+ static const char transition_ver[] = "HUION_T153_160607";
+ char *ver_ptr = NULL;
+ const size_t ver_len = sizeof(transition_ver) + 1;
+ __u8 *params_ptr = NULL;
+ size_t params_len = 0;
+ /* Parameters string descriptor of a model with touch ring (HS610) */
+ const __u8 touch_ring_model_params_buf[] = {
+ 0x13, 0x03, 0x70, 0xC6, 0x00, 0x06, 0x7C, 0x00,
+ 0xFF, 0x1F, 0xD8, 0x13, 0x03, 0x0D, 0x10, 0x01,
+ 0x04, 0x3C, 0x3E
+ };
+
+ /* Check arguments */
+ if (params == NULL || hdev == NULL) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ udev = hid_to_usb_dev(hdev);
+ iface = to_usb_interface(hdev->dev.parent);
+ bInterfaceNumber = iface->cur_altsetting->desc.bInterfaceNumber;
+
+ /* If it's a custom keyboard interface */
+ if (bInterfaceNumber == 1) {
+ /* Keep everything intact, but mark pen usage invalid */
+ p.pen.usage_invalid = true;
+ goto output;
+ /* Else, if it's not a pen interface */
+ } else if (bInterfaceNumber != 0) {
+ uclogic_params_init_invalid(&p);
+ goto output;
+ }
+
+ /* Try to get firmware version */
+ ver_ptr = kzalloc(ver_len, GFP_KERNEL);
+ if (ver_ptr == NULL) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+ rc = usb_string(udev, 201, ver_ptr, ver_len);
+ if (rc == -EPIPE) {
+ *ver_ptr = '\0';
+ } else if (rc < 0) {
+ hid_err(hdev,
+ "failed retrieving Huion firmware version: %d\n", rc);
+ goto cleanup;
+ }
+
+ /* If this is a transition firmware */
+ if (strcmp(ver_ptr, transition_ver) == 0) {
+ hid_dbg(hdev,
+ "transition firmware detected, not probing pen v2 parameters\n");
+ } else {
+ /* Try to probe v2 pen parameters */
+ rc = uclogic_params_pen_init_v2(&p.pen, &found,
+ &params_ptr, &params_len,
+ hdev);
+ if (rc != 0) {
+ hid_err(hdev,
+ "failed probing pen v2 parameters: %d\n", rc);
+ goto cleanup;
+ } else if (found) {
+ hid_dbg(hdev, "pen v2 parameters found\n");
+ /* Create v2 frame button parameters */
+ rc = uclogic_params_frame_init_with_desc(
+ &p.frame_list[0],
+ uclogic_rdesc_v2_frame_buttons_arr,
+ uclogic_rdesc_v2_frame_buttons_size,
+ UCLOGIC_RDESC_V2_FRAME_BUTTONS_ID);
+ if (rc != 0) {
+ hid_err(hdev,
+ "failed creating v2 frame button parameters: %d\n",
+ rc);
+ goto cleanup;
+ }
+
+ /* Link from pen sub-report */
+ p.pen.subreport_list[0].value = 0xe0;
+ p.pen.subreport_list[0].id =
+ UCLOGIC_RDESC_V2_FRAME_BUTTONS_ID;
+
+ /* If this is the model with touch ring */
+ if (params_ptr != NULL &&
+ params_len == sizeof(touch_ring_model_params_buf) &&
+ memcmp(params_ptr, touch_ring_model_params_buf,
+ params_len) == 0) {
+ /* Create touch ring parameters */
+ rc = uclogic_params_frame_init_with_desc(
+ &p.frame_list[1],
+ uclogic_rdesc_v2_frame_touch_ring_arr,
+ uclogic_rdesc_v2_frame_touch_ring_size,
+ UCLOGIC_RDESC_V2_FRAME_TOUCH_ID);
+ if (rc != 0) {
+ hid_err(hdev,
+ "failed creating v2 frame touch ring parameters: %d\n",
+ rc);
+ goto cleanup;
+ }
+ p.frame_list[1].suffix = "Touch Ring";
+ p.frame_list[1].dev_id_byte =
+ UCLOGIC_RDESC_V2_FRAME_TOUCH_DEV_ID_BYTE;
+ p.frame_list[1].touch_byte = 5;
+ p.frame_list[1].touch_max = 12;
+ p.frame_list[1].touch_flip_at = 7;
+ } else {
+ /* Create touch strip parameters */
+ rc = uclogic_params_frame_init_with_desc(
+ &p.frame_list[1],
+ uclogic_rdesc_v2_frame_touch_strip_arr,
+ uclogic_rdesc_v2_frame_touch_strip_size,
+ UCLOGIC_RDESC_V2_FRAME_TOUCH_ID);
+ if (rc != 0) {
+ hid_err(hdev,
+ "failed creating v2 frame touch strip parameters: %d\n",
+ rc);
+ goto cleanup;
+ }
+ p.frame_list[1].suffix = "Touch Strip";
+ p.frame_list[1].dev_id_byte =
+ UCLOGIC_RDESC_V2_FRAME_TOUCH_DEV_ID_BYTE;
+ p.frame_list[1].touch_byte = 5;
+ p.frame_list[1].touch_max = 8;
+ }
+
+ /* Link from pen sub-report */
+ p.pen.subreport_list[1].value = 0xf0;
+ p.pen.subreport_list[1].id =
+ UCLOGIC_RDESC_V2_FRAME_TOUCH_ID;
+
+ /* Create v2 frame dial parameters */
+ rc = uclogic_params_frame_init_with_desc(
+ &p.frame_list[2],
+ uclogic_rdesc_v2_frame_dial_arr,
+ uclogic_rdesc_v2_frame_dial_size,
+ UCLOGIC_RDESC_V2_FRAME_DIAL_ID);
+ if (rc != 0) {
+ hid_err(hdev,
+ "failed creating v2 frame dial parameters: %d\n",
+ rc);
+ goto cleanup;
+ }
+ p.frame_list[2].suffix = "Dial";
+ p.frame_list[2].dev_id_byte =
+ UCLOGIC_RDESC_V2_FRAME_DIAL_DEV_ID_BYTE;
+ p.frame_list[2].bitmap_dial_byte = 5;
+
+ /* Link from pen sub-report */
+ p.pen.subreport_list[2].value = 0xf1;
+ p.pen.subreport_list[2].id =
+ UCLOGIC_RDESC_V2_FRAME_DIAL_ID;
+
+ goto output;
+ }
+ hid_dbg(hdev, "pen v2 parameters not found\n");
+ }
+
+ /* Try to probe v1 pen parameters */
+ rc = uclogic_params_pen_init_v1(&p.pen, &found, hdev);
+ if (rc != 0) {
+ hid_err(hdev,
+ "failed probing pen v1 parameters: %d\n", rc);
+ goto cleanup;
+ } else if (found) {
+ hid_dbg(hdev, "pen v1 parameters found\n");
+ /* Try to probe v1 frame */
+ rc = uclogic_params_frame_init_v1(&p.frame_list[0],
+ &found, hdev);
+ if (rc != 0) {
+ hid_err(hdev, "v1 frame probing failed: %d\n", rc);
+ goto cleanup;
+ }
+ hid_dbg(hdev, "frame v1 parameters%s found\n",
+ (found ? "" : " not"));
+ if (found) {
+ /* Link frame button subreports from pen reports */
+ p.pen.subreport_list[0].value = 0xe0;
+ p.pen.subreport_list[0].id =
+ UCLOGIC_RDESC_V1_FRAME_ID;
+ }
+ goto output;
+ }
+ hid_dbg(hdev, "pen v1 parameters not found\n");
+
+ uclogic_params_init_invalid(&p);
+
+output:
+ /* Output parameters */
+ memcpy(params, &p, sizeof(*params));
+ memset(&p, 0, sizeof(p));
+ rc = 0;
+cleanup:
+ kfree(params_ptr);
+ kfree(ver_ptr);
+ uclogic_params_cleanup(&p);
+ return rc;
+}
+
+/**
+ * uclogic_probe_interface() - some tablets, like the Parblo A610 PLUS V2 or
+ * the XP-PEN Deco Mini 7, need to be initialized by sending them magic data.
+ *
+ * @hdev: The HID device of the tablet interface to initialize and get
+ * parameters from. Cannot be NULL.
+ * @magic_arr: The magic data that should be sent to probe the interface.
+ * Cannot be NULL.
+ * @magic_size: Size of the magic data.
+ * @endpoint: Endpoint where the magic data should be sent.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_probe_interface(struct hid_device *hdev, const u8 *magic_arr,
+ size_t magic_size, int endpoint)
+{
+ struct usb_device *udev;
+ unsigned int pipe = 0;
+ int sent;
+ u8 *buf = NULL;
+ int rc = 0;
+
+ if (!hdev || !magic_arr) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ buf = kmemdup(magic_arr, magic_size, GFP_KERNEL);
+ if (!buf) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+
+ udev = hid_to_usb_dev(hdev);
+ pipe = usb_sndintpipe(udev, endpoint);
+
+ rc = usb_interrupt_msg(udev, pipe, buf, magic_size, &sent, 1000);
+ if (rc || sent != magic_size) {
+ hid_err(hdev, "Interface probing failed: %d\n", rc);
+ rc = -1;
+ goto cleanup;
+ }
+
+ rc = 0;
+cleanup:
+ kfree(buf);
+ return rc;
+}
+
+/**
+ * uclogic_params_parse_ugee_v2_desc - parse the string descriptor containing
+ * pen and frame parameters returned by UGEE v2 devices.
+ *
+ * @str_desc: String descriptor, cannot be NULL.
+ * @str_desc_size: Size of the string descriptor.
+ * @desc_params: Output description params list.
+ * @desc_params_size: Size of the output description params list.
+ * @frame_type: Output frame type.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_parse_ugee_v2_desc(const __u8 *str_desc,
+ size_t str_desc_size,
+ s32 *desc_params,
+ size_t desc_params_size,
+ enum uclogic_params_frame_type *frame_type)
+{
+ s32 pen_x_lm, pen_y_lm;
+ s32 pen_x_pm, pen_y_pm;
+ s32 pen_pressure_lm;
+ s32 frame_num_buttons;
+ s32 resolution;
+
+ /* Minimum descriptor length required, maximum seen so far is 14 */
+ const int min_str_desc_size = 12;
+
+ if (!str_desc || str_desc_size < min_str_desc_size)
+ return -EINVAL;
+
+ if (desc_params_size != UCLOGIC_RDESC_PH_ID_NUM)
+ return -EINVAL;
+
+ pen_x_lm = get_unaligned_le16(str_desc + 2);
+ pen_y_lm = get_unaligned_le16(str_desc + 4);
+ frame_num_buttons = str_desc[6];
+ *frame_type = str_desc[7];
+ pen_pressure_lm = get_unaligned_le16(str_desc + 8);
+
+ resolution = get_unaligned_le16(str_desc + 10);
+ if (resolution == 0) {
+ pen_x_pm = 0;
+ pen_y_pm = 0;
+ } else {
+ pen_x_pm = pen_x_lm * 1000 / resolution;
+ pen_y_pm = pen_y_lm * 1000 / resolution;
+ }
+
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_LM] = pen_x_lm;
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_PM] = pen_x_pm;
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_LM] = pen_y_lm;
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_PM] = pen_y_pm;
+ desc_params[UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM] = pen_pressure_lm;
+ desc_params[UCLOGIC_RDESC_FRAME_PH_ID_UM] = frame_num_buttons;
+
+ return 0;
+}
+
+/**
+ * uclogic_params_ugee_v2_init_frame_buttons() - initialize a UGEE v2 frame with
+ * buttons.
+ * @p: Parameters to fill in, cannot be NULL.
+ * @desc_params: Device description params list.
+ * @desc_params_size: Size of the description params list.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_ugee_v2_init_frame_buttons(struct uclogic_params *p,
+ const s32 *desc_params,
+ size_t desc_params_size)
+{
+ __u8 *rdesc_frame = NULL;
+ int rc = 0;
+
+ if (!p || desc_params_size != UCLOGIC_RDESC_PH_ID_NUM)
+ return -EINVAL;
+
+ rdesc_frame = uclogic_rdesc_template_apply(
+ uclogic_rdesc_ugee_v2_frame_btn_template_arr,
+ uclogic_rdesc_ugee_v2_frame_btn_template_size,
+ desc_params, UCLOGIC_RDESC_PH_ID_NUM);
+ if (!rdesc_frame)
+ return -ENOMEM;
+
+ rc = uclogic_params_frame_init_with_desc(&p->frame_list[0],
+ rdesc_frame,
+ uclogic_rdesc_ugee_v2_frame_btn_template_size,
+ UCLOGIC_RDESC_V1_FRAME_ID);
+ kfree(rdesc_frame);
+ return rc;
+}
+
+/**
+ * uclogic_params_ugee_v2_init_frame_dial() - initialize a UGEE v2 frame with a
+ * bitmap dial.
+ * @p: Parameters to fill in, cannot be NULL.
+ * @desc_params: Device description params list.
+ * @desc_params_size: Size of the description params list.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_ugee_v2_init_frame_dial(struct uclogic_params *p,
+ const s32 *desc_params,
+ size_t desc_params_size)
+{
+ __u8 *rdesc_frame = NULL;
+ int rc = 0;
+
+ if (!p || desc_params_size != UCLOGIC_RDESC_PH_ID_NUM)
+ return -EINVAL;
+
+ rdesc_frame = uclogic_rdesc_template_apply(
+ uclogic_rdesc_ugee_v2_frame_dial_template_arr,
+ uclogic_rdesc_ugee_v2_frame_dial_template_size,
+ desc_params, UCLOGIC_RDESC_PH_ID_NUM);
+ if (!rdesc_frame)
+ return -ENOMEM;
+
+ rc = uclogic_params_frame_init_with_desc(&p->frame_list[0],
+ rdesc_frame,
+ uclogic_rdesc_ugee_v2_frame_dial_template_size,
+ UCLOGIC_RDESC_V1_FRAME_ID);
+ kfree(rdesc_frame);
+ if (rc)
+ return rc;
+
+ p->frame_list[0].bitmap_dial_byte = 7;
+ return 0;
+}
+
+/**
+ * uclogic_params_ugee_v2_init_frame_mouse() - initialize a UGEE v2 frame with a
+ * mouse.
+ * @p: Parameters to fill in, cannot be NULL.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_ugee_v2_init_frame_mouse(struct uclogic_params *p)
+{
+ int rc = 0;
+
+ if (!p)
+ return -EINVAL;
+
+ rc = uclogic_params_frame_init_with_desc(&p->frame_list[1],
+ uclogic_rdesc_ugee_v2_frame_mouse_template_arr,
+ uclogic_rdesc_ugee_v2_frame_mouse_template_size,
+ UCLOGIC_RDESC_V1_FRAME_ID);
+ return rc;
+}
+
+/**
+ * uclogic_params_ugee_v2_has_battery() - check whether a UGEE v2 device has
+ * battery or not.
+ * @hdev: The HID device of the tablet interface.
+ *
+ * Returns:
+ * True if the device has battery, false otherwise.
+ */
+static bool uclogic_params_ugee_v2_has_battery(struct hid_device *hdev)
+{
+ struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
+
+ if (drvdata->quirks & UCLOGIC_BATTERY_QUIRK)
+ return true;
+
+ /* The XP-PEN Deco LW vendor, product and version are identical to the
+ * Deco L. The only difference reported by their firmware is the product
+ * name. Add a quirk to support battery reporting on the wireless
+ * version.
+ */
+ if (hdev->vendor == USB_VENDOR_ID_UGEE &&
+ hdev->product == USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L) {
+ struct usb_device *udev = hid_to_usb_dev(hdev);
+
+ if (strstarts(udev->product, "Deco LW"))
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * uclogic_params_ugee_v2_init_battery() - initialize UGEE v2 battery reporting.
+ * @hdev: The HID device of the tablet interface, cannot be NULL.
+ * @p: Parameters to fill in, cannot be NULL.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_ugee_v2_init_battery(struct hid_device *hdev,
+ struct uclogic_params *p)
+{
+ int rc = 0;
+
+ if (!hdev || !p)
+ return -EINVAL;
+
+ /* Some tablets contain invalid characters in hdev->uniq, throwing a
+ * "hwmon: '<name>' is not a valid name attribute, please fix" error.
+ * Use the device vendor and product IDs instead.
+ */
+ snprintf(hdev->uniq, sizeof(hdev->uniq), "%x-%x", hdev->vendor,
+ hdev->product);
+
+ rc = uclogic_params_frame_init_with_desc(&p->frame_list[1],
+ uclogic_rdesc_ugee_v2_battery_template_arr,
+ uclogic_rdesc_ugee_v2_battery_template_size,
+ UCLOGIC_RDESC_UGEE_V2_BATTERY_ID);
+ if (rc)
+ return rc;
+
+ p->frame_list[1].suffix = "Battery";
+ p->pen.subreport_list[1].value = 0xf2;
+ p->pen.subreport_list[1].id = UCLOGIC_RDESC_UGEE_V2_BATTERY_ID;
+
+ return rc;
+}
+
+/**
+ * uclogic_params_ugee_v2_reconnect_work() - When a wireless tablet looses
+ * connection to the USB dongle and reconnects, either because of its physical
+ * distance or because it was switches off and on using the frame's switch,
+ * uclogic_probe_interface() needs to be called again to enable the tablet.
+ *
+ * @work: The work that triggered this function.
+ */
+static void uclogic_params_ugee_v2_reconnect_work(struct work_struct *work)
+{
+ struct uclogic_raw_event_hook *event_hook;
+
+ event_hook = container_of(work, struct uclogic_raw_event_hook, work);
+ uclogic_probe_interface(event_hook->hdev, uclogic_ugee_v2_probe_arr,
+ uclogic_ugee_v2_probe_size,
+ uclogic_ugee_v2_probe_endpoint);
+}
+
+/**
+ * uclogic_params_ugee_v2_init_event_hooks() - initialize the list of events
+ * to be hooked for UGEE v2 devices.
+ * @hdev: The HID device of the tablet interface to initialize and get
+ * parameters from.
+ * @p: Parameters to fill in, cannot be NULL.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_ugee_v2_init_event_hooks(struct hid_device *hdev,
+ struct uclogic_params *p)
+{
+ struct uclogic_raw_event_hook *event_hook;
+ __u8 reconnect_event[] = {
+ /* Event received on wireless tablet reconnection */
+ 0x02, 0xF8, 0x02, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+ };
+
+ if (!p)
+ return -EINVAL;
+
+ /* The reconnection event is only received if the tablet has battery */
+ if (!uclogic_params_ugee_v2_has_battery(hdev))
+ return 0;
+
+ p->event_hooks = kzalloc(sizeof(*p->event_hooks), GFP_KERNEL);
+ if (!p->event_hooks)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&p->event_hooks->list);
+
+ event_hook = kzalloc(sizeof(*event_hook), GFP_KERNEL);
+ if (!event_hook)
+ return -ENOMEM;
+
+ INIT_WORK(&event_hook->work, uclogic_params_ugee_v2_reconnect_work);
+ event_hook->hdev = hdev;
+ event_hook->size = ARRAY_SIZE(reconnect_event);
+ event_hook->event = kmemdup(reconnect_event, event_hook->size, GFP_KERNEL);
+ if (!event_hook->event)
+ return -ENOMEM;
+
+ list_add_tail(&event_hook->list, &p->event_hooks->list);
+
+ return 0;
+}
+
+/**
+ * uclogic_params_ugee_v2_init() - initialize a UGEE graphics tablets by
+ * discovering their parameters.
+ *
+ * These tables, internally designed as v2 to differentiate them from older
+ * models, expect a payload of magic data in orther to be switched to the fully
+ * functional mode and expose their parameters in a similar way to the
+ * information present in uclogic_params_pen_init_v1() but with some
+ * differences.
+ *
+ * @params: Parameters to fill in (to be cleaned with
+ * uclogic_params_cleanup()). Not modified in case of error.
+ * Cannot be NULL.
+ * @hdev: The HID device of the tablet interface to initialize and get
+ * parameters from. Cannot be NULL.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_ugee_v2_init(struct uclogic_params *params,
+ struct hid_device *hdev)
+{
+ int rc = 0;
+ struct uclogic_drvdata *drvdata;
+ struct usb_interface *iface;
+ __u8 bInterfaceNumber;
+ const int str_desc_len = 12;
+ __u8 *str_desc = NULL;
+ __u8 *rdesc_pen = NULL;
+ s32 desc_params[UCLOGIC_RDESC_PH_ID_NUM];
+ enum uclogic_params_frame_type frame_type;
+ /* The resulting parameters (noop) */
+ struct uclogic_params p = {0, };
+
+ if (!params || !hdev) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ drvdata = hid_get_drvdata(hdev);
+ iface = to_usb_interface(hdev->dev.parent);
+ bInterfaceNumber = iface->cur_altsetting->desc.bInterfaceNumber;
+
+ if (bInterfaceNumber == 0) {
+ rc = uclogic_params_ugee_v2_init_frame_mouse(&p);
+ if (rc)
+ goto cleanup;
+
+ goto output;
+ }
+
+ if (bInterfaceNumber != 2) {
+ uclogic_params_init_invalid(&p);
+ goto output;
+ }
+
+ /*
+ * Initialize the interface by sending magic data.
+ * The specific data was discovered by sniffing the Windows driver
+ * traffic.
+ */
+ rc = uclogic_probe_interface(hdev, uclogic_ugee_v2_probe_arr,
+ uclogic_ugee_v2_probe_size,
+ uclogic_ugee_v2_probe_endpoint);
+ if (rc) {
+ uclogic_params_init_invalid(&p);
+ goto output;
+ }
+
+ /*
+ * Read the string descriptor containing pen and frame parameters.
+ * The specific string descriptor and data were discovered by sniffing
+ * the Windows driver traffic.
+ */
+ rc = uclogic_params_get_str_desc(&str_desc, hdev, 100, str_desc_len);
+ if (rc != str_desc_len) {
+ hid_err(hdev, "failed retrieving pen and frame parameters: %d\n", rc);
+ uclogic_params_init_invalid(&p);
+ goto output;
+ }
+
+ rc = uclogic_params_parse_ugee_v2_desc(str_desc, str_desc_len,
+ desc_params,
+ ARRAY_SIZE(desc_params),
+ &frame_type);
+ if (rc)
+ goto cleanup;
+
+ kfree(str_desc);
+ str_desc = NULL;
+
+ /* Initialize the pen interface */
+ rdesc_pen = uclogic_rdesc_template_apply(
+ uclogic_rdesc_ugee_v2_pen_template_arr,
+ uclogic_rdesc_ugee_v2_pen_template_size,
+ desc_params, ARRAY_SIZE(desc_params));
+ if (!rdesc_pen) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+
+ p.pen.desc_ptr = rdesc_pen;
+ p.pen.desc_size = uclogic_rdesc_ugee_v2_pen_template_size;
+ p.pen.id = 0x02;
+ p.pen.subreport_list[0].value = 0xf0;
+ p.pen.subreport_list[0].id = UCLOGIC_RDESC_V1_FRAME_ID;
+
+ /* Initialize the frame interface */
+ if (drvdata->quirks & UCLOGIC_MOUSE_FRAME_QUIRK)
+ frame_type = UCLOGIC_PARAMS_FRAME_MOUSE;
+
+ switch (frame_type) {
+ case UCLOGIC_PARAMS_FRAME_DIAL:
+ case UCLOGIC_PARAMS_FRAME_MOUSE:
+ rc = uclogic_params_ugee_v2_init_frame_dial(&p, desc_params,
+ ARRAY_SIZE(desc_params));
+ break;
+ case UCLOGIC_PARAMS_FRAME_BUTTONS:
+ default:
+ rc = uclogic_params_ugee_v2_init_frame_buttons(&p, desc_params,
+ ARRAY_SIZE(desc_params));
+ break;
+ }
+
+ if (rc)
+ goto cleanup;
+
+ /* Initialize the battery interface*/
+ if (uclogic_params_ugee_v2_has_battery(hdev)) {
+ rc = uclogic_params_ugee_v2_init_battery(hdev, &p);
+ if (rc) {
+ hid_err(hdev, "error initializing battery: %d\n", rc);
+ goto cleanup;
+ }
+ }
+
+ /* Create a list of raw events to be ignored */
+ rc = uclogic_params_ugee_v2_init_event_hooks(hdev, &p);
+ if (rc) {
+ hid_err(hdev, "error initializing event hook list: %d\n", rc);
+ goto cleanup;
+ }
+
+output:
+ /* Output parameters */
+ memcpy(params, &p, sizeof(*params));
+ memset(&p, 0, sizeof(p));
+ rc = 0;
+cleanup:
+ kfree(str_desc);
+ uclogic_params_cleanup(&p);
+ return rc;
+}
+
+/**
+ * uclogic_params_init() - initialize a tablet interface and discover its
+ * parameters.
+ *
+ * @params: Parameters to fill in (to be cleaned with
+ * uclogic_params_cleanup()). Not modified in case of error.
+ * Cannot be NULL.
+ * @hdev: The HID device of the tablet interface to initialize and get
+ * parameters from. Cannot be NULL. Must be using the USB low-level
+ * driver, i.e. be an actual USB tablet.
+ *
+ * Returns:
+ * Zero, if successful. A negative errno code on error.
+ */
+int uclogic_params_init(struct uclogic_params *params,
+ struct hid_device *hdev)
+{
+ int rc;
+ struct usb_device *udev;
+ __u8 bNumInterfaces;
+ struct usb_interface *iface;
+ __u8 bInterfaceNumber;
+ bool found;
+ /* The resulting parameters (noop) */
+ struct uclogic_params p = {0, };
+
+ /* Check arguments */
+ if (params == NULL || hdev == NULL || !hid_is_usb(hdev)) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ udev = hid_to_usb_dev(hdev);
+ bNumInterfaces = udev->config->desc.bNumInterfaces;
+ iface = to_usb_interface(hdev->dev.parent);
+ bInterfaceNumber = iface->cur_altsetting->desc.bInterfaceNumber;
+
+ /*
+ * Set replacement report descriptor if the original matches the
+ * specified size. Otherwise keep interface unchanged.
+ */
+#define WITH_OPT_DESC(_orig_desc_token, _new_desc_token) \
+ uclogic_params_init_with_opt_desc( \
+ &p, hdev, \
+ UCLOGIC_RDESC_##_orig_desc_token##_SIZE, \
+ uclogic_rdesc_##_new_desc_token##_arr, \
+ uclogic_rdesc_##_new_desc_token##_size)
+
+#define VID_PID(_vid, _pid) \
+ (((__u32)(_vid) << 16) | ((__u32)(_pid) & U16_MAX))
+
+ /*
+ * Handle specific interfaces for specific tablets.
+ *
+ * Observe the following logic:
+ *
+ * If the interface is recognized as producing certain useful input:
+ * Mark interface as valid.
+ * Output interface parameters.
+ * Else, if the interface is recognized as *not* producing any useful
+ * input:
+ * Mark interface as invalid.
+ * Else:
+ * Mark interface as valid.
+ * Output noop parameters.
+ *
+ * Rule of thumb: it is better to disable a broken interface than let
+ * it spew garbage input.
+ */
+
+ switch (VID_PID(hdev->vendor, hdev->product)) {
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_UCLOGIC_TABLET_PF1209):
+ rc = WITH_OPT_DESC(PF1209_ORIG, pf1209_fixed);
+ if (rc != 0)
+ goto cleanup;
+ break;
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_UCLOGIC_TABLET_WP4030U):
+ rc = WITH_OPT_DESC(WPXXXXU_ORIG, wp4030u_fixed);
+ if (rc != 0)
+ goto cleanup;
+ break;
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_UCLOGIC_TABLET_WP5540U):
+ if (hdev->dev_rsize == UCLOGIC_RDESC_WP5540U_V2_ORIG_SIZE) {
+ if (bInterfaceNumber == 0) {
+ /* Try to probe v1 pen parameters */
+ rc = uclogic_params_pen_init_v1(&p.pen,
+ &found, hdev);
+ if (rc != 0) {
+ hid_err(hdev,
+ "pen probing failed: %d\n",
+ rc);
+ goto cleanup;
+ }
+ if (!found) {
+ hid_warn(hdev,
+ "pen parameters not found");
+ }
+ } else {
+ uclogic_params_init_invalid(&p);
+ }
+ } else {
+ rc = WITH_OPT_DESC(WPXXXXU_ORIG, wp5540u_fixed);
+ if (rc != 0)
+ goto cleanup;
+ }
+ break;
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_UCLOGIC_TABLET_WP8060U):
+ rc = WITH_OPT_DESC(WPXXXXU_ORIG, wp8060u_fixed);
+ if (rc != 0)
+ goto cleanup;
+ break;
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_UCLOGIC_TABLET_WP1062):
+ rc = WITH_OPT_DESC(WP1062_ORIG, wp1062_fixed);
+ if (rc != 0)
+ goto cleanup;
+ break;
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_UCLOGIC_WIRELESS_TABLET_TWHL850):
+ switch (bInterfaceNumber) {
+ case 0:
+ rc = WITH_OPT_DESC(TWHL850_ORIG0, twhl850_fixed0);
+ if (rc != 0)
+ goto cleanup;
+ break;
+ case 1:
+ rc = WITH_OPT_DESC(TWHL850_ORIG1, twhl850_fixed1);
+ if (rc != 0)
+ goto cleanup;
+ break;
+ case 2:
+ rc = WITH_OPT_DESC(TWHL850_ORIG2, twhl850_fixed2);
+ if (rc != 0)
+ goto cleanup;
+ break;
+ }
+ break;
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_UCLOGIC_TABLET_TWHA60):
+ /*
+ * If it is not a three-interface version, which is known to
+ * respond to initialization.
+ */
+ if (bNumInterfaces != 3) {
+ switch (bInterfaceNumber) {
+ case 0:
+ rc = WITH_OPT_DESC(TWHA60_ORIG0,
+ twha60_fixed0);
+ if (rc != 0)
+ goto cleanup;
+ break;
+ case 1:
+ rc = WITH_OPT_DESC(TWHA60_ORIG1,
+ twha60_fixed1);
+ if (rc != 0)
+ goto cleanup;
+ break;
+ }
+ break;
+ }
+ fallthrough;
+ case VID_PID(USB_VENDOR_ID_HUION,
+ USB_DEVICE_ID_HUION_TABLET):
+ case VID_PID(USB_VENDOR_ID_HUION,
+ USB_DEVICE_ID_HUION_TABLET2):
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_HUION_TABLET):
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_YIYNOVA_TABLET):
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_81):
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_UCLOGIC_DRAWIMAGE_G3):
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_45):
+ case VID_PID(USB_VENDOR_ID_UCLOGIC,
+ USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_47):
+ rc = uclogic_params_huion_init(&p, hdev);
+ if (rc != 0)
+ goto cleanup;
+ break;
+ case VID_PID(USB_VENDOR_ID_UGTIZER,
+ USB_DEVICE_ID_UGTIZER_TABLET_GP0610):
+ case VID_PID(USB_VENDOR_ID_UGTIZER,
+ USB_DEVICE_ID_UGTIZER_TABLET_GT5040):
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_XPPEN_TABLET_G540):
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_XPPEN_TABLET_G640):
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_XPPEN_TABLET_STAR06):
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_TABLET_RAINBOW_CV720):
+ /* If this is the pen interface */
+ if (bInterfaceNumber == 1) {
+ /* Probe v1 pen parameters */
+ rc = uclogic_params_pen_init_v1(&p.pen, &found, hdev);
+ if (rc != 0) {
+ hid_err(hdev, "pen probing failed: %d\n", rc);
+ goto cleanup;
+ }
+ if (!found) {
+ hid_warn(hdev, "pen parameters not found");
+ uclogic_params_init_invalid(&p);
+ }
+ } else {
+ uclogic_params_init_invalid(&p);
+ }
+ break;
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO01):
+ /* If this is the pen and frame interface */
+ if (bInterfaceNumber == 1) {
+ /* Probe v1 pen parameters */
+ rc = uclogic_params_pen_init_v1(&p.pen, &found, hdev);
+ if (rc != 0) {
+ hid_err(hdev, "pen probing failed: %d\n", rc);
+ goto cleanup;
+ }
+ /* Initialize frame parameters */
+ rc = uclogic_params_frame_init_with_desc(
+ &p.frame_list[0],
+ uclogic_rdesc_xppen_deco01_frame_arr,
+ uclogic_rdesc_xppen_deco01_frame_size,
+ 0);
+ if (rc != 0)
+ goto cleanup;
+ } else {
+ uclogic_params_init_invalid(&p);
+ }
+ break;
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_PARBLO_A610_PRO):
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO01_V2):
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L):
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_PRO_MW):
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_PRO_S):
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_PRO_SW):
+ rc = uclogic_params_ugee_v2_init(&p, hdev);
+ if (rc != 0)
+ goto cleanup;
+ break;
+ case VID_PID(USB_VENDOR_ID_TRUST,
+ USB_DEVICE_ID_TRUST_PANORA_TABLET):
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_TABLET_G5):
+ /* Ignore non-pen interfaces */
+ if (bInterfaceNumber != 1) {
+ uclogic_params_init_invalid(&p);
+ break;
+ }
+
+ rc = uclogic_params_pen_init_v1(&p.pen, &found, hdev);
+ if (rc != 0) {
+ hid_err(hdev, "pen probing failed: %d\n", rc);
+ goto cleanup;
+ } else if (found) {
+ rc = uclogic_params_frame_init_with_desc(
+ &p.frame_list[0],
+ uclogic_rdesc_ugee_g5_frame_arr,
+ uclogic_rdesc_ugee_g5_frame_size,
+ UCLOGIC_RDESC_UGEE_G5_FRAME_ID);
+ if (rc != 0) {
+ hid_err(hdev,
+ "failed creating frame parameters: %d\n",
+ rc);
+ goto cleanup;
+ }
+ p.frame_list[0].re_lsb =
+ UCLOGIC_RDESC_UGEE_G5_FRAME_RE_LSB;
+ p.frame_list[0].dev_id_byte =
+ UCLOGIC_RDESC_UGEE_G5_FRAME_DEV_ID_BYTE;
+ } else {
+ hid_warn(hdev, "pen parameters not found");
+ uclogic_params_init_invalid(&p);
+ }
+
+ break;
+ case VID_PID(USB_VENDOR_ID_UGEE,
+ USB_DEVICE_ID_UGEE_TABLET_EX07S):
+ /* Ignore non-pen interfaces */
+ if (bInterfaceNumber != 1) {
+ uclogic_params_init_invalid(&p);
+ break;
+ }
+
+ rc = uclogic_params_pen_init_v1(&p.pen, &found, hdev);
+ if (rc != 0) {
+ hid_err(hdev, "pen probing failed: %d\n", rc);
+ goto cleanup;
+ } else if (found) {
+ rc = uclogic_params_frame_init_with_desc(
+ &p.frame_list[0],
+ uclogic_rdesc_ugee_ex07_frame_arr,
+ uclogic_rdesc_ugee_ex07_frame_size,
+ 0);
+ if (rc != 0) {
+ hid_err(hdev,
+ "failed creating frame parameters: %d\n",
+ rc);
+ goto cleanup;
+ }
+ } else {
+ hid_warn(hdev, "pen parameters not found");
+ uclogic_params_init_invalid(&p);
+ }
+
+ break;
+ }
+
+#undef VID_PID
+#undef WITH_OPT_DESC
+
+ /* Output parameters */
+ memcpy(params, &p, sizeof(*params));
+ memset(&p, 0, sizeof(p));
+ rc = 0;
+cleanup:
+ uclogic_params_cleanup(&p);
+ return rc;
+}
+
+#ifdef CONFIG_HID_KUNIT_TEST
+#include "hid-uclogic-params-test.c"
+#endif