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wacom_sys.c
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wacom_sys.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* drivers/input/tablet/wacom_sys.c
*
* USB Wacom tablet support - system specific code
*/
/*
*/
#include "wacom_wac.h"
#include "wacom.h"
#include <linux/input/mt.h>
#define WAC_MSG_RETRIES 5
#define WAC_CMD_RETRIES 10
#define DEV_ATTR_RW_PERM (S_IRUGO | S_IWUSR | S_IWGRP)
#define DEV_ATTR_WO_PERM (S_IWUSR | S_IWGRP)
#define DEV_ATTR_RO_PERM (S_IRUSR | S_IRGRP)
static int wacom_get_report(struct hid_device *hdev, u8 type, u8 *buf,
size_t size, unsigned int retries)
{
int retval;
do {
retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
HID_REQ_GET_REPORT);
} while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
if (retval < 0)
hid_err(hdev, "wacom_get_report: ran out of retries "
"(last error = %d)\n", retval);
return retval;
}
static int wacom_set_report(struct hid_device *hdev, u8 type, u8 *buf,
size_t size, unsigned int retries)
{
int retval;
do {
retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
HID_REQ_SET_REPORT);
} while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
if (retval < 0)
hid_err(hdev, "wacom_set_report: ran out of retries "
"(last error = %d)\n", retval);
return retval;
}
static void wacom_wac_queue_insert(struct hid_device *hdev,
struct kfifo_rec_ptr_2 *fifo,
u8 *raw_data, int size)
{
bool warned = false;
while (kfifo_avail(fifo) < size) {
if (!warned)
hid_warn(hdev, "%s: kfifo has filled, starting to drop events\n", __func__);
warned = true;
kfifo_skip(fifo);
}
kfifo_in(fifo, raw_data, size);
}
static void wacom_wac_queue_flush(struct hid_device *hdev,
struct kfifo_rec_ptr_2 *fifo)
{
while (!kfifo_is_empty(fifo)) {
u8 buf[WACOM_PKGLEN_MAX];
int size;
int err;
size = kfifo_out(fifo, buf, sizeof(buf));
err = hid_report_raw_event(hdev, HID_INPUT_REPORT, buf, size, false);
if (err) {
hid_warn(hdev, "%s: unable to flush event due to error %d\n",
__func__, err);
}
}
}
static int wacom_wac_pen_serial_enforce(struct hid_device *hdev,
struct hid_report *report, u8 *raw_data, int report_size)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
struct wacom_features *features = &wacom_wac->features;
bool flush = false;
bool insert = false;
int i, j;
if (wacom_wac->serial[0] || !(features->quirks & WACOM_QUIRK_TOOLSERIAL))
return 0;
/* Queue events which have invalid tool type or serial number */
for (i = 0; i < report->maxfield; i++) {
for (j = 0; j < report->field[i]->maxusage; j++) {
struct hid_field *field = report->field[i];
struct hid_usage *usage = &field->usage[j];
unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
unsigned int offset;
unsigned int size;
unsigned int value;
if (equivalent_usage != HID_DG_INRANGE &&
equivalent_usage != HID_DG_TOOLSERIALNUMBER &&
equivalent_usage != WACOM_HID_WD_SERIALHI &&
equivalent_usage != WACOM_HID_WD_TOOLTYPE)
continue;
offset = field->report_offset;
size = field->report_size;
value = hid_field_extract(hdev, raw_data+1, offset + j * size, size);
/* If we go out of range, we need to flush the queue ASAP */
if (equivalent_usage == HID_DG_INRANGE)
value = !value;
if (value) {
flush = true;
switch (equivalent_usage) {
case HID_DG_TOOLSERIALNUMBER:
wacom_wac->serial[0] = value;
break;
case WACOM_HID_WD_SERIALHI:
wacom_wac->serial[0] |= ((__u64)value) << 32;
break;
case WACOM_HID_WD_TOOLTYPE:
wacom_wac->id[0] = value;
break;
}
}
else {
insert = true;
}
}
}
if (flush)
wacom_wac_queue_flush(hdev, wacom_wac->pen_fifo);
else if (insert)
wacom_wac_queue_insert(hdev, wacom_wac->pen_fifo,
raw_data, report_size);
return insert && !flush;
}
static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
u8 *raw_data, int size)
{
struct wacom *wacom = hid_get_drvdata(hdev);
if (size > WACOM_PKGLEN_MAX)
return 1;
if (wacom_wac_pen_serial_enforce(hdev, report, raw_data, size))
return -1;
memcpy(wacom->wacom_wac.data, raw_data, size);
wacom_wac_irq(&wacom->wacom_wac, size);
return 0;
}
static int wacom_open(struct input_dev *dev)
{
struct wacom *wacom = input_get_drvdata(dev);
return hid_hw_open(wacom->hdev);
}
static void wacom_close(struct input_dev *dev)
{
struct wacom *wacom = input_get_drvdata(dev);
/*
* wacom->hdev should never be null, but surprisingly, I had the case
* once while unplugging the Wacom Wireless Receiver.
*/
if (wacom->hdev)
hid_hw_close(wacom->hdev);
}
/*
* Calculate the resolution of the X or Y axis using hidinput_calc_abs_res.
*/
static int wacom_calc_hid_res(int logical_extents, int physical_extents,
unsigned unit, int exponent)
{
struct hid_field field = {
.logical_maximum = logical_extents,
.physical_maximum = physical_extents,
.unit = unit,
.unit_exponent = exponent,
};
return hidinput_calc_abs_res(&field, ABS_X);
}
static void wacom_hid_usage_quirk(struct hid_device *hdev,
struct hid_field *field, struct hid_usage *usage)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_features *features = &wacom->wacom_wac.features;
unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
/*
* The Dell Canvas 27 needs to be switched to its vendor-defined
* report to provide the best resolution.
*/
if (hdev->vendor == USB_VENDOR_ID_WACOM &&
hdev->product == 0x4200 &&
field->application == HID_UP_MSVENDOR) {
wacom->wacom_wac.mode_report = field->report->id;
wacom->wacom_wac.mode_value = 2;
}
/*
* ISDv4 devices which predate HID's adoption of the
* HID_DG_BARELSWITCH2 usage use 0x000D0000 in its
* position instead. We can accurately detect if a
* usage with that value should be HID_DG_BARRELSWITCH2
* based on the surrounding usages, which have remained
* constant across generations.
*/
if (features->type == HID_GENERIC &&
usage->hid == 0x000D0000 &&
field->application == HID_DG_PEN &&
field->physical == HID_DG_STYLUS) {
int i = usage->usage_index;
if (i-4 >= 0 && i+1 < field->maxusage &&
field->usage[i-4].hid == HID_DG_TIPSWITCH &&
field->usage[i-3].hid == HID_DG_BARRELSWITCH &&
field->usage[i-2].hid == HID_DG_ERASER &&
field->usage[i-1].hid == HID_DG_INVERT &&
field->usage[i+1].hid == HID_DG_INRANGE) {
usage->hid = HID_DG_BARRELSWITCH2;
}
}
/*
* Wacom's AES devices use different vendor-defined usages to
* report serial number information compared to their branded
* hardware. The usages are also sometimes ill-defined and do
* not have the correct logical min/max values set. Lets patch
* the descriptor to use the branded usage convention and fix
* the errors.
*/
if (usage->hid == WACOM_HID_WT_SERIALNUMBER &&
field->report_size == 16 &&
field->index + 2 < field->report->maxfield) {
struct hid_field *a = field->report->field[field->index + 1];
struct hid_field *b = field->report->field[field->index + 2];
if (a->maxusage > 0 &&
a->usage[0].hid == HID_DG_TOOLSERIALNUMBER &&
a->report_size == 32 &&
b->maxusage > 0 &&
b->usage[0].hid == 0xFF000000 &&
b->report_size == 8) {
features->quirks |= WACOM_QUIRK_AESPEN;
usage->hid = WACOM_HID_WD_TOOLTYPE;
field->logical_minimum = S16_MIN;
field->logical_maximum = S16_MAX;
a->logical_minimum = S32_MIN;
a->logical_maximum = S32_MAX;
b->usage[0].hid = WACOM_HID_WD_SERIALHI;
b->logical_minimum = 0;
b->logical_maximum = U8_MAX;
}
}
/* 2nd-generation Intuos Pro Large has incorrect Y maximum */
if (hdev->vendor == USB_VENDOR_ID_WACOM &&
hdev->product == 0x0358 &&
WACOM_PEN_FIELD(field) &&
equivalent_usage == HID_GD_Y) {
field->logical_maximum = 43200;
}
}
static void wacom_feature_mapping(struct hid_device *hdev,
struct hid_field *field, struct hid_usage *usage)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_features *features = &wacom->wacom_wac.features;
struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
u8 *data;
int ret;
u32 n;
wacom_hid_usage_quirk(hdev, field, usage);
switch (equivalent_usage) {
case WACOM_HID_WD_TOUCH_RING_SETTING:
wacom->generic_has_leds = true;
break;
case HID_DG_CONTACTMAX:
/* leave touch_max as is if predefined */
if (!features->touch_max) {
/* read manually */
n = hid_report_len(field->report);
data = hid_alloc_report_buf(field->report, GFP_KERNEL);
if (!data)
break;
data[0] = field->report->id;
ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
data, n, WAC_CMD_RETRIES);
if (ret == n && features->type == HID_GENERIC) {
ret = hid_report_raw_event(hdev,
HID_FEATURE_REPORT, data, n, 0);
} else if (ret == 2 && features->type != HID_GENERIC) {
features->touch_max = data[1];
} else {
features->touch_max = 16;
hid_warn(hdev, "wacom_feature_mapping: "
"could not get HID_DG_CONTACTMAX, "
"defaulting to %d\n",
features->touch_max);
}
kfree(data);
}
break;
case HID_DG_INPUTMODE:
/* Ignore if value index is out of bounds. */
if (usage->usage_index >= field->report_count) {
dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
break;
}
hid_data->inputmode = field->report->id;
hid_data->inputmode_index = usage->usage_index;
break;
case HID_UP_DIGITIZER:
if (field->report->id == 0x0B &&
(field->application == WACOM_HID_G9_PEN ||
field->application == WACOM_HID_G11_PEN)) {
wacom->wacom_wac.mode_report = field->report->id;
wacom->wacom_wac.mode_value = 0;
}
break;
case WACOM_HID_WD_DATAMODE:
wacom->wacom_wac.mode_report = field->report->id;
wacom->wacom_wac.mode_value = 2;
break;
case WACOM_HID_UP_G9:
case WACOM_HID_UP_G11:
if (field->report->id == 0x03 &&
(field->application == WACOM_HID_G9_TOUCHSCREEN ||
field->application == WACOM_HID_G11_TOUCHSCREEN)) {
wacom->wacom_wac.mode_report = field->report->id;
wacom->wacom_wac.mode_value = 0;
}
break;
case WACOM_HID_WD_OFFSETLEFT:
case WACOM_HID_WD_OFFSETTOP:
case WACOM_HID_WD_OFFSETRIGHT:
case WACOM_HID_WD_OFFSETBOTTOM:
/* read manually */
n = hid_report_len(field->report);
data = hid_alloc_report_buf(field->report, GFP_KERNEL);
if (!data)
break;
data[0] = field->report->id;
ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
data, n, WAC_CMD_RETRIES);
if (ret == n) {
ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT,
data, n, 0);
} else {
hid_warn(hdev, "%s: could not retrieve sensor offsets\n",
__func__);
}
kfree(data);
break;
}
}
/*
* Interface Descriptor of wacom devices can be incomplete and
* inconsistent so wacom_features table is used to store stylus
* device's packet lengths, various maximum values, and tablet
* resolution based on product ID's.
*
* For devices that contain 2 interfaces, wacom_features table is
* inaccurate for the touch interface. Since the Interface Descriptor
* for touch interfaces has pretty complete data, this function exists
* to query tablet for this missing information instead of hard coding in
* an additional table.
*
* A typical Interface Descriptor for a stylus will contain a
* boot mouse application collection that is not of interest and this
* function will ignore it.
*
* It also contains a digitizer application collection that also is not
* of interest since any information it contains would be duplicate
* of what is in wacom_features. Usually it defines a report of an array
* of bytes that could be used as max length of the stylus packet returned.
* If it happens to define a Digitizer-Stylus Physical Collection then
* the X and Y logical values contain valid data but it is ignored.
*
* A typical Interface Descriptor for a touch interface will contain a
* Digitizer-Finger Physical Collection which will define both logical
* X/Y maximum as well as the physical size of tablet. Since touch
* interfaces haven't supported pressure or distance, this is enough
* information to override invalid values in the wacom_features table.
*
* Intuos5 touch interface and 3rd gen Bamboo Touch do not contain useful
* data. We deal with them after returning from this function.
*/
static void wacom_usage_mapping(struct hid_device *hdev,
struct hid_field *field, struct hid_usage *usage)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_features *features = &wacom->wacom_wac.features;
bool finger = WACOM_FINGER_FIELD(field);
bool pen = WACOM_PEN_FIELD(field);
unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);
/*
* Requiring Stylus Usage will ignore boot mouse
* X/Y values and some cases of invalid Digitizer X/Y
* values commonly reported.
*/
if (pen)
features->device_type |= WACOM_DEVICETYPE_PEN;
else if (finger)
features->device_type |= WACOM_DEVICETYPE_TOUCH;
else
return;
wacom_hid_usage_quirk(hdev, field, usage);
switch (equivalent_usage) {
case HID_GD_X:
features->x_max = field->logical_maximum;
if (finger) {
features->x_phy = field->physical_maximum;
if ((features->type != BAMBOO_PT) &&
(features->type != BAMBOO_TOUCH)) {
features->unit = field->unit;
features->unitExpo = field->unit_exponent;
}
}
break;
case HID_GD_Y:
features->y_max = field->logical_maximum;
if (finger) {
features->y_phy = field->physical_maximum;
if ((features->type != BAMBOO_PT) &&
(features->type != BAMBOO_TOUCH)) {
features->unit = field->unit;
features->unitExpo = field->unit_exponent;
}
}
break;
case HID_DG_TIPPRESSURE:
if (pen)
features->pressure_max = field->logical_maximum;
break;
}
if (features->type == HID_GENERIC)
wacom_wac_usage_mapping(hdev, field, usage);
}
static void wacom_post_parse_hid(struct hid_device *hdev,
struct wacom_features *features)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
if (features->type == HID_GENERIC) {
/* Any last-minute generic device setup */
if (wacom_wac->has_mode_change) {
if (wacom_wac->is_direct_mode)
features->device_type |= WACOM_DEVICETYPE_DIRECT;
else
features->device_type &= ~WACOM_DEVICETYPE_DIRECT;
}
if (features->touch_max > 1) {
if (features->device_type & WACOM_DEVICETYPE_DIRECT)
input_mt_init_slots(wacom_wac->touch_input,
wacom_wac->features.touch_max,
INPUT_MT_DIRECT);
else
input_mt_init_slots(wacom_wac->touch_input,
wacom_wac->features.touch_max,
INPUT_MT_POINTER);
}
}
}
static void wacom_parse_hid(struct hid_device *hdev,
struct wacom_features *features)
{
struct hid_report_enum *rep_enum;
struct hid_report *hreport;
int i, j;
/* check features first */
rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
list_for_each_entry(hreport, &rep_enum->report_list, list) {
for (i = 0; i < hreport->maxfield; i++) {
/* Ignore if report count is out of bounds. */
if (hreport->field[i]->report_count < 1)
continue;
for (j = 0; j < hreport->field[i]->maxusage; j++) {
wacom_feature_mapping(hdev, hreport->field[i],
hreport->field[i]->usage + j);
}
}
}
/* now check the input usages */
rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
list_for_each_entry(hreport, &rep_enum->report_list, list) {
if (!hreport->maxfield)
continue;
for (i = 0; i < hreport->maxfield; i++)
for (j = 0; j < hreport->field[i]->maxusage; j++)
wacom_usage_mapping(hdev, hreport->field[i],
hreport->field[i]->usage + j);
}
wacom_post_parse_hid(hdev, features);
}
static int wacom_hid_set_device_mode(struct hid_device *hdev)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
struct hid_report *r;
struct hid_report_enum *re;
if (hid_data->inputmode < 0)
return 0;
re = &(hdev->report_enum[HID_FEATURE_REPORT]);
r = re->report_id_hash[hid_data->inputmode];
if (r) {
r->field[0]->value[hid_data->inputmode_index] = 2;
hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
}
return 0;
}
static int wacom_set_device_mode(struct hid_device *hdev,
struct wacom_wac *wacom_wac)
{
u8 *rep_data;
struct hid_report *r;
struct hid_report_enum *re;
u32 length;
int error = -ENOMEM, limit = 0;
if (wacom_wac->mode_report < 0)
return 0;
re = &(hdev->report_enum[HID_FEATURE_REPORT]);
r = re->report_id_hash[wacom_wac->mode_report];
if (!r)
return -EINVAL;
rep_data = hid_alloc_report_buf(r, GFP_KERNEL);
if (!rep_data)
return -ENOMEM;
length = hid_report_len(r);
do {
rep_data[0] = wacom_wac->mode_report;
rep_data[1] = wacom_wac->mode_value;
error = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data,
length, 1);
if (error >= 0)
error = wacom_get_report(hdev, HID_FEATURE_REPORT,
rep_data, length, 1);
} while (error >= 0 &&
rep_data[1] != wacom_wac->mode_report &&
limit++ < WAC_MSG_RETRIES);
kfree(rep_data);
return error < 0 ? error : 0;
}
static int wacom_bt_query_tablet_data(struct hid_device *hdev, u8 speed,
struct wacom_features *features)
{
struct wacom *wacom = hid_get_drvdata(hdev);
int ret;
u8 rep_data[2];
switch (features->type) {
case GRAPHIRE_BT:
rep_data[0] = 0x03;
rep_data[1] = 0x00;
ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
3);
if (ret >= 0) {
rep_data[0] = speed == 0 ? 0x05 : 0x06;
rep_data[1] = 0x00;
ret = wacom_set_report(hdev, HID_FEATURE_REPORT,
rep_data, 2, 3);
if (ret >= 0) {
wacom->wacom_wac.bt_high_speed = speed;
return 0;
}
}
/*
* Note that if the raw queries fail, it's not a hard failure
* and it is safe to continue
*/
hid_warn(hdev, "failed to poke device, command %d, err %d\n",
rep_data[0], ret);
break;
case INTUOS4WL:
if (speed == 1)
wacom->wacom_wac.bt_features &= ~0x20;
else
wacom->wacom_wac.bt_features |= 0x20;
rep_data[0] = 0x03;
rep_data[1] = wacom->wacom_wac.bt_features;
ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
1);
if (ret >= 0)
wacom->wacom_wac.bt_high_speed = speed;
break;
}
return 0;
}
/*
* Switch the tablet into its most-capable mode. Wacom tablets are
* typically configured to power-up in a mode which sends mouse-like
* reports to the OS. To get absolute position, pressure data, etc.
* from the tablet, it is necessary to switch the tablet out of this
* mode and into one which sends the full range of tablet data.
*/
static int _wacom_query_tablet_data(struct wacom *wacom)
{
struct hid_device *hdev = wacom->hdev;
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
struct wacom_features *features = &wacom_wac->features;
if (hdev->bus == BUS_BLUETOOTH)
return wacom_bt_query_tablet_data(hdev, 1, features);
if (features->type != HID_GENERIC) {
if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
if (features->type > TABLETPC) {
/* MT Tablet PC touch */
wacom_wac->mode_report = 3;
wacom_wac->mode_value = 4;
} else if (features->type == WACOM_24HDT) {
wacom_wac->mode_report = 18;
wacom_wac->mode_value = 2;
} else if (features->type == WACOM_27QHDT) {
wacom_wac->mode_report = 131;
wacom_wac->mode_value = 2;
} else if (features->type == BAMBOO_PAD) {
wacom_wac->mode_report = 2;
wacom_wac->mode_value = 2;
}
} else if (features->device_type & WACOM_DEVICETYPE_PEN) {
if (features->type <= BAMBOO_PT) {
wacom_wac->mode_report = 2;
wacom_wac->mode_value = 2;
}
}
}
wacom_set_device_mode(hdev, wacom_wac);
if (features->type == HID_GENERIC)
return wacom_hid_set_device_mode(hdev);
return 0;
}
static void wacom_retrieve_hid_descriptor(struct hid_device *hdev,
struct wacom_features *features)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct usb_interface *intf = wacom->intf;
/* default features */
features->x_fuzz = 4;
features->y_fuzz = 4;
features->pressure_fuzz = 0;
features->distance_fuzz = 1;
features->tilt_fuzz = 1;
/*
* The wireless device HID is basic and layout conflicts with
* other tablets (monitor and touch interface can look like pen).
* Skip the query for this type and modify defaults based on
* interface number.
*/
if (features->type == WIRELESS) {
if (intf->cur_altsetting->desc.bInterfaceNumber == 0)
features->device_type = WACOM_DEVICETYPE_WL_MONITOR;
else
features->device_type = WACOM_DEVICETYPE_NONE;
return;
}
wacom_parse_hid(hdev, features);
}
struct wacom_hdev_data {
struct list_head list;
struct kref kref;
struct hid_device *dev;
struct wacom_shared shared;
};
static LIST_HEAD(wacom_udev_list);
static DEFINE_MUTEX(wacom_udev_list_lock);
static bool wacom_are_sibling(struct hid_device *hdev,
struct hid_device *sibling)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_features *features = &wacom->wacom_wac.features;
struct wacom *sibling_wacom = hid_get_drvdata(sibling);
struct wacom_features *sibling_features = &sibling_wacom->wacom_wac.features;
__u32 oVid = features->oVid ? features->oVid : hdev->vendor;
__u32 oPid = features->oPid ? features->oPid : hdev->product;
/* The defined oVid/oPid must match that of the sibling */
if (features->oVid != HID_ANY_ID && sibling->vendor != oVid)
return false;
if (features->oPid != HID_ANY_ID && sibling->product != oPid)
return false;
/*
* Devices with the same VID/PID must share the same physical
* device path, while those with different VID/PID must share
* the same physical parent device path.
*/
if (hdev->vendor == sibling->vendor && hdev->product == sibling->product) {
if (!hid_compare_device_paths(hdev, sibling, '/'))
return false;
} else {
if (!hid_compare_device_paths(hdev, sibling, '.'))
return false;
}
/* Skip the remaining heuristics unless you are a HID_GENERIC device */
if (features->type != HID_GENERIC)
return true;
/*
* Direct-input devices may not be siblings of indirect-input
* devices.
*/
if ((features->device_type & WACOM_DEVICETYPE_DIRECT) &&
!(sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
return false;
/*
* Indirect-input devices may not be siblings of direct-input
* devices.
*/
if (!(features->device_type & WACOM_DEVICETYPE_DIRECT) &&
(sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
return false;
/* Pen devices may only be siblings of touch devices */
if ((features->device_type & WACOM_DEVICETYPE_PEN) &&
!(sibling_features->device_type & WACOM_DEVICETYPE_TOUCH))
return false;
/* Touch devices may only be siblings of pen devices */
if ((features->device_type & WACOM_DEVICETYPE_TOUCH) &&
!(sibling_features->device_type & WACOM_DEVICETYPE_PEN))
return false;
/*
* No reason could be found for these two devices to NOT be
* siblings, so there's a good chance they ARE siblings
*/
return true;
}
static struct wacom_hdev_data *wacom_get_hdev_data(struct hid_device *hdev)
{
struct wacom_hdev_data *data;
/* Try to find an already-probed interface from the same device */
list_for_each_entry(data, &wacom_udev_list, list) {
if (hid_compare_device_paths(hdev, data->dev, '/')) {
kref_get(&data->kref);
return data;
}
}
/* Fallback to finding devices that appear to be "siblings" */
list_for_each_entry(data, &wacom_udev_list, list) {
if (wacom_are_sibling(hdev, data->dev)) {
kref_get(&data->kref);
return data;
}
}
return NULL;
}
static void wacom_release_shared_data(struct kref *kref)
{
struct wacom_hdev_data *data =
container_of(kref, struct wacom_hdev_data, kref);
mutex_lock(&wacom_udev_list_lock);
list_del(&data->list);
mutex_unlock(&wacom_udev_list_lock);
kfree(data);
}
static void wacom_remove_shared_data(void *res)
{
struct wacom *wacom = res;
struct wacom_hdev_data *data;
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
if (wacom_wac->shared) {
data = container_of(wacom_wac->shared, struct wacom_hdev_data,
shared);
if (wacom_wac->shared->touch == wacom->hdev)
wacom_wac->shared->touch = NULL;
else if (wacom_wac->shared->pen == wacom->hdev)
wacom_wac->shared->pen = NULL;
kref_put(&data->kref, wacom_release_shared_data);
wacom_wac->shared = NULL;
}
}
static int wacom_add_shared_data(struct hid_device *hdev)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
struct wacom_hdev_data *data;
int retval = 0;
mutex_lock(&wacom_udev_list_lock);
data = wacom_get_hdev_data(hdev);
if (!data) {
data = kzalloc(sizeof(struct wacom_hdev_data), GFP_KERNEL);
if (!data) {
retval = -ENOMEM;
goto out;
}
kref_init(&data->kref);
data->dev = hdev;
list_add_tail(&data->list, &wacom_udev_list);
}
wacom_wac->shared = &data->shared;
retval = devm_add_action(&hdev->dev, wacom_remove_shared_data, wacom);
if (retval) {
mutex_unlock(&wacom_udev_list_lock);
wacom_remove_shared_data(wacom);
return retval;
}
if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)
wacom_wac->shared->touch = hdev;
else if (wacom_wac->features.device_type & WACOM_DEVICETYPE_PEN)
wacom_wac->shared->pen = hdev;
out:
mutex_unlock(&wacom_udev_list_lock);
return retval;
}
static int wacom_led_control(struct wacom *wacom)
{
unsigned char *buf;
int retval;
unsigned char report_id = WAC_CMD_LED_CONTROL;
int buf_size = 9;
if (!wacom->led.groups)
return -ENOTSUPP;
if (wacom->wacom_wac.features.type == REMOTE)
return -ENOTSUPP;
if (wacom->wacom_wac.pid) { /* wireless connected */
report_id = WAC_CMD_WL_LED_CONTROL;
buf_size = 13;
}
else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
report_id = WAC_CMD_WL_INTUOSP2;
buf_size = 51;
}
buf = kzalloc(buf_size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
if (wacom->wacom_wac.features.type == HID_GENERIC) {
buf[0] = WAC_CMD_LED_CONTROL_GENERIC;
buf[1] = wacom->led.llv;
buf[2] = wacom->led.groups[0].select & 0x03;
} else if ((wacom->wacom_wac.features.type >= INTUOS5S &&
wacom->wacom_wac.features.type <= INTUOSPL)) {
/*
* Touch Ring and crop mark LED luminance may take on
* one of four values:
* 0 = Low; 1 = Medium; 2 = High; 3 = Off
*/
int ring_led = wacom->led.groups[0].select & 0x03;
int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03;
int crop_lum = 0;
unsigned char led_bits = (crop_lum << 4) | (ring_lum << 2) | (ring_led);
buf[0] = report_id;
if (wacom->wacom_wac.pid) {
wacom_get_report(wacom->hdev, HID_FEATURE_REPORT,
buf, buf_size, WAC_CMD_RETRIES);
buf[0] = report_id;
buf[4] = led_bits;
} else
buf[1] = led_bits;
}
else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
buf[0] = report_id;
buf[4] = 100; // Power Connection LED (ORANGE)
buf[5] = 100; // BT Connection LED (BLUE)
buf[6] = 100; // Paper Mode (RED?)
buf[7] = 100; // Paper Mode (GREEN?)
buf[8] = 100; // Paper Mode (BLUE?)
buf[9] = wacom->led.llv;
buf[10] = wacom->led.groups[0].select & 0x03;
}
else {
int led = wacom->led.groups[0].select | 0x4;
if (wacom->wacom_wac.features.type == WACOM_21UX2 ||
wacom->wacom_wac.features.type == WACOM_24HD)
led |= (wacom->led.groups[1].select << 4) | 0x40;
buf[0] = report_id;
buf[1] = led;
buf[2] = wacom->led.llv;
buf[3] = wacom->led.hlv;
buf[4] = wacom->led.img_lum;
}
retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, buf_size,
WAC_CMD_RETRIES);
kfree(buf);
return retval;
}
static int wacom_led_putimage(struct wacom *wacom, int button_id, u8 xfer_id,
const unsigned len, const void *img)
{
unsigned char *buf;
int i, retval;
const unsigned chunk_len = len / 4; /* 4 chunks are needed to be sent */