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hid-uclogic-params.c
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hid-uclogic-params.c
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// 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 <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 12, 0)
#include <asm/unaligned.h>
#else
#include <linux/unaligned.h>
#endif
/**
* uclogic_params_pen_inrange_to_str() - 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.
*/
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;
}
}
/**
* Dump tablet interface pen parameters with hid_dbg(), indented with one tab.
*
* @hdev: The HID device the pen parameters describe.
* @pen: The pen parameters to dump.
*/
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"));
}
/**
* Dump tablet interface frame parameters with hid_dbg(), indented with two
* tabs.
*
* @hdev: The HID device the pen parameters describe.
* @frame: The frame parameters to dump.
*/
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);
}
/**
* Dump tablet interface parameters with hid_dbg().
*
* @hdev: The HID device the parameters describe.
* @params: The parameters to dump.
*/
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, ¶ms->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, ¶ms->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, ¶ms->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(¶ms->pen);
for (i = 0; i < ARRAY_SIZE(params->frame_list); i++)
uclogic_params_frame_cleanup(¶ms->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 || bInterfaceNumber == 2) {
/* 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;
}
/* The firmware is used in userspace as unique identifier */
strscpy(hdev->uniq, ver_ptr, sizeof(hdev->uniq));
/* 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,
¶ms_ptr, ¶ms_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;
/* Create v2 frame group buttons parameters */
rc = uclogic_params_frame_init_with_desc(
&p.frame_list[3],
uclogic_rdesc_v2_frame_gbuttons_arr,
uclogic_rdesc_v2_frame_gbuttons_size,