Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/hid/hid-uclogic-params.c b/drivers/hid/hid-uclogic-params.c
new file mode 100644
index 0000000..78a364a
--- /dev/null
+++ b/drivers/hid/hid-uclogic-params.c
@@ -0,0 +1,1122 @@
+// 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 <asm/unaligned.h>
+
+/**
+ * Convert a pen in-range reporting type to a string.
+ *
+ * @inrange: The in-range reporting type to convert.
+ *
+ * Returns:
+ * The string representing the type, or NULL if the type is unknown.
+ */
+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_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 = hid_to_usb_dev(hdev);
+ __u8 *buf = NULL;
+
+ /* Check arguments */
+ if (hdev == NULL) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ 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 #%hhu: %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_PEN_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_pen_v1_template_arr,
+ uclogic_rdesc_pen_v1_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_pen_v1_template_size;
+ pen->id = UCLOGIC_RDESC_PEN_V1_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.
+ * @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,
+ struct hid_device *hdev)
+{
+ int rc;
+ bool found = false;
+ /* Buffer for (part of) the string descriptor */
+ __u8 *buf = NULL;
+ /* Descriptor length required */
+ const int len = 18;
+ s32 resolution;
+ /* Pen report descriptor template parameters */
+ s32 desc_params[UCLOGIC_RDESC_PEN_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, 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;
+ } else {
+ size_t i;
+ /*
+ * 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 < len &&
+ (buf[i] >= 0x20 && buf[i] < 0x7f && buf[i + 1] == 0);
+ i += 2);
+ if (i >= 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;
+ }
+ kfree(buf);
+ buf = NULL;
+
+ /*
+ * Generate pen report descriptor
+ */
+ desc_ptr = uclogic_rdesc_template_apply(
+ uclogic_rdesc_pen_v2_template_arr,
+ uclogic_rdesc_pen_v2_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_pen_v2_template_size;
+ pen->id = UCLOGIC_RDESC_PEN_V2_ID;
+ pen->inrange = UCLOGIC_PARAMS_PEN_INRANGE_NONE;
+ pen->fragmented_hires = true;
+ found = true;
+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_buttonpad() - initialize abstract buttonpad
+ * on a v1 tablet interface.
+ *
+ * @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_buttonpad(
+ struct uclogic_params_frame *frame,
+ bool *pfound,
+ struct hid_device *hdev)
+{
+ int rc;
+ bool found = false;
+ struct usb_device *usb_dev = hid_to_usb_dev(hdev);
+ char *str_buf = NULL;
+ const size_t str_len = 16;
+
+ /* Check arguments */
+ if (frame == NULL || pfound == NULL || hdev == NULL) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ /*
+ * 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_buttonpad_v1_arr,
+ uclogic_rdesc_buttonpad_v1_size,
+ UCLOGIC_RDESC_BUTTONPAD_V1_ID);
+ if (rc != 0)
+ goto cleanup;
+ found = true;
+ }
+
+ *pfound = found;
+ rc = 0;
+cleanup:
+ kfree(str_buf);
+ return rc;
+}
+
+/**
+ * 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) {
+ kfree(params->desc_ptr);
+ if (!params->pen_unused)
+ uclogic_params_pen_cleanup(¶ms->pen);
+ uclogic_params_frame_cleanup(¶ms->frame);
+ memset(params, 0, sizeof(*params));
+ }
+}
+
+/**
+ * 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)
+{
+ bool common_present;
+ bool pen_present;
+ bool frame_present;
+ unsigned int size;
+ __u8 *desc = NULL;
+
+ /* Check arguments */
+ if (params == NULL || pdesc == NULL || psize == NULL)
+ return -EINVAL;
+
+ size = 0;
+
+ common_present = (params->desc_ptr != NULL);
+ pen_present = (!params->pen_unused && params->pen.desc_ptr != NULL);
+ frame_present = (params->frame.desc_ptr != NULL);
+
+ if (common_present)
+ size += params->desc_size;
+ if (pen_present)
+ size += params->pen.desc_size;
+ if (frame_present)
+ size += params->frame.desc_size;
+
+ if (common_present || pen_present || frame_present) {
+ __u8 *p;
+
+ desc = kmalloc(size, GFP_KERNEL);
+ if (desc == NULL)
+ return -ENOMEM;
+ p = desc;
+
+ if (common_present) {
+ memcpy(p, params->desc_ptr,
+ params->desc_size);
+ p += params->desc_size;
+ }
+ if (pen_present) {
+ memcpy(p, params->pen.desc_ptr,
+ params->pen.desc_size);
+ p += params->pen.desc_size;
+ }
+ if (frame_present) {
+ memcpy(p, params->frame.desc_ptr,
+ params->frame.desc_size);
+ p += params->frame.desc_size;
+ }
+
+ WARN_ON(p != desc + size);
+
+ *psize = size;
+ }
+
+ *pdesc = desc;
+ return 0;
+}
+
+/**
+ * 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_init_with_pen_unused() - initialize tablet interface
+ * parameters preserving original reports and generic HID processing, but
+ * disabling pen usage.
+ *
+ * @params: Parameters to initialize (to be cleaned with
+ * uclogic_params_cleanup()). Not modified in case of
+ * error. Cannot be NULL.
+ */
+static void uclogic_params_init_with_pen_unused(struct uclogic_params *params)
+{
+ memset(params, 0, sizeof(*params));
+ params->pen_unused = true;
+}
+
+/**
+ * uclogic_params_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 = hid_to_usb_dev(hdev);
+ struct usb_interface *iface = to_usb_interface(hdev->dev.parent);
+ __u8 bInterfaceNumber = iface->cur_altsetting->desc.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;
+
+ /* Check arguments */
+ if (params == NULL || hdev == NULL) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ /* If it's not a pen interface */
+ if (bInterfaceNumber != 0) {
+ /* TODO: Consider marking the interface invalid */
+ uclogic_params_init_with_pen_unused(&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, 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 buttonpad parameters */
+ rc = uclogic_params_frame_init_with_desc(
+ &p.frame,
+ uclogic_rdesc_buttonpad_v2_arr,
+ uclogic_rdesc_buttonpad_v2_size,
+ UCLOGIC_RDESC_BUTTONPAD_V2_ID);
+ if (rc != 0) {
+ hid_err(hdev,
+ "failed creating v2 buttonpad parameters: %d\n",
+ rc);
+ goto cleanup;
+ }
+ /* Set bitmask marking frame reports in pen reports */
+ p.pen_frame_flag = 0x20;
+ 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 buttonpad */
+ rc = uclogic_params_frame_init_v1_buttonpad(
+ &p.frame,
+ &found, hdev);
+ if (rc != 0) {
+ hid_err(hdev, "v1 buttonpad probing failed: %d\n", rc);
+ goto cleanup;
+ }
+ hid_dbg(hdev, "buttonpad v1 parameters%s found\n",
+ (found ? "" : " not"));
+ if (found) {
+ /* Set bitmask marking frame reports */
+ p.pen_frame_flag = 0x20;
+ }
+ 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(ver_ptr);
+ 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 = hid_to_usb_dev(hdev);
+ __u8 bNumInterfaces = udev->config->desc.bNumInterfaces;
+ struct usb_interface *iface = to_usb_interface(hdev->dev.parent);
+ __u8 bInterfaceNumber = iface->cur_altsetting->desc.bInterfaceNumber;
+ bool found;
+ /* The resulting parameters (noop) */
+ struct uclogic_params p = {0, };
+
+ /* Check arguments */
+ if (params == NULL || hdev == NULL ||
+ !hid_is_using_ll_driver(hdev, &usb_hid_driver)) {
+ rc = -EINVAL;
+ goto cleanup;
+ }
+
+ /*
+ * 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;
+ }
+ /* FALL THROUGH */
+ case VID_PID(USB_VENDOR_ID_HUION,
+ USB_DEVICE_ID_HUION_TABLET):
+ case VID_PID(USB_VENDOR_ID_HUION,
+ USB_DEVICE_ID_HUION_HS64):
+ 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_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_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 {
+ /* TODO: Consider marking the interface invalid */
+ uclogic_params_init_with_pen_unused(&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,
+ uclogic_rdesc_xppen_deco01_frame_arr,
+ uclogic_rdesc_xppen_deco01_frame_size,
+ 0);
+ if (rc != 0)
+ goto cleanup;
+ } else {
+ /* TODO: Consider marking the interface invalid */
+ uclogic_params_init_with_pen_unused(&p);
+ }
+ break;
+ 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,
+ 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 buttonpad parameters: %d\n",
+ rc);
+ goto cleanup;
+ }
+ p.frame.re_lsb =
+ UCLOGIC_RDESC_UGEE_G5_FRAME_RE_LSB;
+ p.frame.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,
+ uclogic_rdesc_ugee_ex07_buttonpad_arr,
+ uclogic_rdesc_ugee_ex07_buttonpad_size,
+ 0);
+ if (rc != 0) {
+ hid_err(hdev,
+ "failed creating buttonpad 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;
+}