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kernel-fxtec-pro1x/drivers/hid/hid-logitech-dj.c
Benjamin Tisssoires 42c22dbf81 HID: logitech-dj: Fix USB 3.0 issue 
This fix (not very clean though) should fix the long time USB3
issue that was spotted last year. The rational has been given by
Hans de Goede:

 ----

I think the most likely cause for this is a firmware bug
in the unifying receiver, likely a race condition.

The most prominent difference between having a USB-2 device
plugged into an EHCI (so USB-2 only) port versus an XHCI
port will be inter packet timing. Specifically if you
send packets (ie hid reports) one at a time, then with
the EHCI controller their will be a significant pause
between them, where with XHCI they will be very close
together in time.

The reason for this is the difference in EHCI / XHCI
controller OS <-> driver interfaces.

For non periodic endpoints (control, bulk) the EHCI uses a
circular linked-list of commands in dma-memory, which it
follows to execute commands, if the list is empty, it
will go into an idle state and re-check periodically.

The XHCI uses a ring of commands per endpoint, and if the OS
places anything new on the ring it will do an ioport write,
waking up the XHCI making it send the new packet immediately.

For periodic transfers (isoc, interrupt) the delay between
packets when sending one at a time (rather then queuing them
up) will be even larger, because they need to be inserted into
the EHCI schedule 2 ms in the future so the OS driver can be
sure that the EHCI driver does not try to start executing the
time slot in question before the insertion has completed.

So a possible fix may be to insert a delay between packets
being send to the receiver.

 ----

I tested this on a buggy Haswell USB 3.0 motherboard, and I always
get the notification after adding the msleep.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2014-01-16 22:48:21 +01:00

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/*
* HID driver for Logitech Unifying receivers
*
* Copyright (c) 2011 Logitech
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <asm/unaligned.h>
#include "hid-ids.h"
#include "hid-logitech-dj.h"
/* Keyboard descriptor (1) */
static const char kbd_descriptor[] = {
0x05, 0x01, /* USAGE_PAGE (generic Desktop) */
0x09, 0x06, /* USAGE (Keyboard) */
0xA1, 0x01, /* COLLECTION (Application) */
0x85, 0x01, /* REPORT_ID (1) */
0x95, 0x08, /* REPORT_COUNT (8) */
0x75, 0x01, /* REPORT_SIZE (1) */
0x15, 0x00, /* LOGICAL_MINIMUM (0) */
0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
0x05, 0x07, /* USAGE_PAGE (Keyboard) */
0x19, 0xE0, /* USAGE_MINIMUM (Left Control) */
0x29, 0xE7, /* USAGE_MAXIMUM (Right GUI) */
0x81, 0x02, /* INPUT (Data,Var,Abs) */
0x95, 0x05, /* REPORT COUNT (5) */
0x05, 0x08, /* USAGE PAGE (LED page) */
0x19, 0x01, /* USAGE MINIMUM (1) */
0x29, 0x05, /* USAGE MAXIMUM (5) */
0x91, 0x02, /* OUTPUT (Data, Variable, Absolute) */
0x95, 0x01, /* REPORT COUNT (1) */
0x75, 0x03, /* REPORT SIZE (3) */
0x91, 0x01, /* OUTPUT (Constant) */
0x95, 0x06, /* REPORT_COUNT (6) */
0x75, 0x08, /* REPORT_SIZE (8) */
0x15, 0x00, /* LOGICAL_MINIMUM (0) */
0x26, 0xFF, 0x00, /* LOGICAL_MAXIMUM (255) */
0x05, 0x07, /* USAGE_PAGE (Keyboard) */
0x19, 0x00, /* USAGE_MINIMUM (no event) */
0x2A, 0xFF, 0x00, /* USAGE_MAXIMUM (reserved) */
0x81, 0x00, /* INPUT (Data,Ary,Abs) */
0xC0
};
/* Mouse descriptor (2) */
static const char mse_descriptor[] = {
0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
0x09, 0x02, /* USAGE (Mouse) */
0xA1, 0x01, /* COLLECTION (Application) */
0x85, 0x02, /* REPORT_ID = 2 */
0x09, 0x01, /* USAGE (pointer) */
0xA1, 0x00, /* COLLECTION (physical) */
0x05, 0x09, /* USAGE_PAGE (buttons) */
0x19, 0x01, /* USAGE_MIN (1) */
0x29, 0x10, /* USAGE_MAX (16) */
0x15, 0x00, /* LOGICAL_MIN (0) */
0x25, 0x01, /* LOGICAL_MAX (1) */
0x95, 0x10, /* REPORT_COUNT (16) */
0x75, 0x01, /* REPORT_SIZE (1) */
0x81, 0x02, /* INPUT (data var abs) */
0x05, 0x01, /* USAGE_PAGE (generic desktop) */
0x16, 0x01, 0xF8, /* LOGICAL_MIN (-2047) */
0x26, 0xFF, 0x07, /* LOGICAL_MAX (2047) */
0x75, 0x0C, /* REPORT_SIZE (12) */
0x95, 0x02, /* REPORT_COUNT (2) */
0x09, 0x30, /* USAGE (X) */
0x09, 0x31, /* USAGE (Y) */
0x81, 0x06, /* INPUT */
0x15, 0x81, /* LOGICAL_MIN (-127) */
0x25, 0x7F, /* LOGICAL_MAX (127) */
0x75, 0x08, /* REPORT_SIZE (8) */
0x95, 0x01, /* REPORT_COUNT (1) */
0x09, 0x38, /* USAGE (wheel) */
0x81, 0x06, /* INPUT */
0x05, 0x0C, /* USAGE_PAGE(consumer) */
0x0A, 0x38, 0x02, /* USAGE(AC Pan) */
0x95, 0x01, /* REPORT_COUNT (1) */
0x81, 0x06, /* INPUT */
0xC0, /* END_COLLECTION */
0xC0, /* END_COLLECTION */
};
/* Consumer Control descriptor (3) */
static const char consumer_descriptor[] = {
0x05, 0x0C, /* USAGE_PAGE (Consumer Devices) */
0x09, 0x01, /* USAGE (Consumer Control) */
0xA1, 0x01, /* COLLECTION (Application) */
0x85, 0x03, /* REPORT_ID = 3 */
0x75, 0x10, /* REPORT_SIZE (16) */
0x95, 0x02, /* REPORT_COUNT (2) */
0x15, 0x01, /* LOGICAL_MIN (1) */
0x26, 0x8C, 0x02, /* LOGICAL_MAX (652) */
0x19, 0x01, /* USAGE_MIN (1) */
0x2A, 0x8C, 0x02, /* USAGE_MAX (652) */
0x81, 0x00, /* INPUT (Data Ary Abs) */
0xC0, /* END_COLLECTION */
}; /* */
/* System control descriptor (4) */
static const char syscontrol_descriptor[] = {
0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
0x09, 0x80, /* USAGE (System Control) */
0xA1, 0x01, /* COLLECTION (Application) */
0x85, 0x04, /* REPORT_ID = 4 */
0x75, 0x02, /* REPORT_SIZE (2) */
0x95, 0x01, /* REPORT_COUNT (1) */
0x15, 0x01, /* LOGICAL_MIN (1) */
0x25, 0x03, /* LOGICAL_MAX (3) */
0x09, 0x82, /* USAGE (System Sleep) */
0x09, 0x81, /* USAGE (System Power Down) */
0x09, 0x83, /* USAGE (System Wake Up) */
0x81, 0x60, /* INPUT (Data Ary Abs NPrf Null) */
0x75, 0x06, /* REPORT_SIZE (6) */
0x81, 0x03, /* INPUT (Cnst Var Abs) */
0xC0, /* END_COLLECTION */
};
/* Media descriptor (8) */
static const char media_descriptor[] = {
0x06, 0xbc, 0xff, /* Usage Page 0xffbc */
0x09, 0x88, /* Usage 0x0088 */
0xa1, 0x01, /* BeginCollection */
0x85, 0x08, /* Report ID 8 */
0x19, 0x01, /* Usage Min 0x0001 */
0x29, 0xff, /* Usage Max 0x00ff */
0x15, 0x01, /* Logical Min 1 */
0x26, 0xff, 0x00, /* Logical Max 255 */
0x75, 0x08, /* Report Size 8 */
0x95, 0x01, /* Report Count 1 */
0x81, 0x00, /* Input */
0xc0, /* EndCollection */
}; /* */
/* Maximum size of all defined hid reports in bytes (including report id) */
#define MAX_REPORT_SIZE 8
/* Make sure all descriptors are present here */
#define MAX_RDESC_SIZE \
(sizeof(kbd_descriptor) + \
sizeof(mse_descriptor) + \
sizeof(consumer_descriptor) + \
sizeof(syscontrol_descriptor) + \
sizeof(media_descriptor))
/* Number of possible hid report types that can be created by this driver.
*
* Right now, RF report types have the same report types (or report id's)
* than the hid report created from those RF reports. In the future
* this doesnt have to be true.
*
* For instance, RF report type 0x01 which has a size of 8 bytes, corresponds
* to hid report id 0x01, this is standard keyboard. Same thing applies to mice
* reports and consumer control, etc. If a new RF report is created, it doesn't
* has to have the same report id as its corresponding hid report, so an
* translation may have to take place for future report types.
*/
#define NUMBER_OF_HID_REPORTS 32
static const u8 hid_reportid_size_map[NUMBER_OF_HID_REPORTS] = {
[1] = 8, /* Standard keyboard */
[2] = 8, /* Standard mouse */
[3] = 5, /* Consumer control */
[4] = 2, /* System control */
[8] = 2, /* Media Center */
};
#define LOGITECH_DJ_INTERFACE_NUMBER 0x02
static struct hid_ll_driver logi_dj_ll_driver;
static int logi_dj_output_hidraw_report(struct hid_device *hid, u8 * buf,
size_t count,
unsigned char report_type);
static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev);
static void logi_dj_recv_destroy_djhid_device(struct dj_receiver_dev *djrcv_dev,
struct dj_report *dj_report)
{
/* Called in delayed work context */
struct dj_device *dj_dev;
unsigned long flags;
spin_lock_irqsave(&djrcv_dev->lock, flags);
dj_dev = djrcv_dev->paired_dj_devices[dj_report->device_index];
djrcv_dev->paired_dj_devices[dj_report->device_index] = NULL;
spin_unlock_irqrestore(&djrcv_dev->lock, flags);
if (dj_dev != NULL) {
hid_destroy_device(dj_dev->hdev);
kfree(dj_dev);
} else {
dev_err(&djrcv_dev->hdev->dev, "%s: can't destroy a NULL device\n",
__func__);
}
}
static void logi_dj_recv_add_djhid_device(struct dj_receiver_dev *djrcv_dev,
struct dj_report *dj_report)
{
/* Called in delayed work context */
struct hid_device *djrcv_hdev = djrcv_dev->hdev;
struct usb_interface *intf = to_usb_interface(djrcv_hdev->dev.parent);
struct usb_device *usbdev = interface_to_usbdev(intf);
struct hid_device *dj_hiddev;
struct dj_device *dj_dev;
/* Device index goes from 1 to 6, we need 3 bytes to store the
* semicolon, the index, and a null terminator
*/
unsigned char tmpstr[3];
if (dj_report->report_params[DEVICE_PAIRED_PARAM_SPFUNCTION] &
SPFUNCTION_DEVICE_LIST_EMPTY) {
dbg_hid("%s: device list is empty\n", __func__);
djrcv_dev->querying_devices = false;
return;
}
if ((dj_report->device_index < DJ_DEVICE_INDEX_MIN) ||
(dj_report->device_index > DJ_DEVICE_INDEX_MAX)) {
dev_err(&djrcv_hdev->dev, "%s: invalid device index:%d\n",
__func__, dj_report->device_index);
return;
}
if (djrcv_dev->paired_dj_devices[dj_report->device_index]) {
/* The device is already known. No need to reallocate it. */
dbg_hid("%s: device is already known\n", __func__);
return;
}
dj_hiddev = hid_allocate_device();
if (IS_ERR(dj_hiddev)) {
dev_err(&djrcv_hdev->dev, "%s: hid_allocate_device failed\n",
__func__);
return;
}
dj_hiddev->ll_driver = &logi_dj_ll_driver;
dj_hiddev->hid_output_raw_report = logi_dj_output_hidraw_report;
dj_hiddev->dev.parent = &djrcv_hdev->dev;
dj_hiddev->bus = BUS_USB;
dj_hiddev->vendor = le16_to_cpu(usbdev->descriptor.idVendor);
dj_hiddev->product = le16_to_cpu(usbdev->descriptor.idProduct);
snprintf(dj_hiddev->name, sizeof(dj_hiddev->name),
"Logitech Unifying Device. Wireless PID:%02x%02x",
dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_MSB],
dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_LSB]);
usb_make_path(usbdev, dj_hiddev->phys, sizeof(dj_hiddev->phys));
snprintf(tmpstr, sizeof(tmpstr), ":%d", dj_report->device_index);
strlcat(dj_hiddev->phys, tmpstr, sizeof(dj_hiddev->phys));
dj_dev = kzalloc(sizeof(struct dj_device), GFP_KERNEL);
if (!dj_dev) {
dev_err(&djrcv_hdev->dev, "%s: failed allocating dj_device\n",
__func__);
goto dj_device_allocate_fail;
}
dj_dev->reports_supported = get_unaligned_le32(
dj_report->report_params + DEVICE_PAIRED_RF_REPORT_TYPE);
dj_dev->hdev = dj_hiddev;
dj_dev->dj_receiver_dev = djrcv_dev;
dj_dev->device_index = dj_report->device_index;
dj_hiddev->driver_data = dj_dev;
djrcv_dev->paired_dj_devices[dj_report->device_index] = dj_dev;
if (hid_add_device(dj_hiddev)) {
dev_err(&djrcv_hdev->dev, "%s: failed adding dj_device\n",
__func__);
goto hid_add_device_fail;
}
return;
hid_add_device_fail:
djrcv_dev->paired_dj_devices[dj_report->device_index] = NULL;
kfree(dj_dev);
dj_device_allocate_fail:
hid_destroy_device(dj_hiddev);
}
static void delayedwork_callback(struct work_struct *work)
{
struct dj_receiver_dev *djrcv_dev =
container_of(work, struct dj_receiver_dev, work);
struct dj_report dj_report;
unsigned long flags;
int count;
int retval;
dbg_hid("%s\n", __func__);
spin_lock_irqsave(&djrcv_dev->lock, flags);
count = kfifo_out(&djrcv_dev->notif_fifo, &dj_report,
sizeof(struct dj_report));
if (count != sizeof(struct dj_report)) {
dev_err(&djrcv_dev->hdev->dev, "%s: workitem triggered without "
"notifications available\n", __func__);
spin_unlock_irqrestore(&djrcv_dev->lock, flags);
return;
}
if (!kfifo_is_empty(&djrcv_dev->notif_fifo)) {
if (schedule_work(&djrcv_dev->work) == 0) {
dbg_hid("%s: did not schedule the work item, was "
"already queued\n", __func__);
}
}
spin_unlock_irqrestore(&djrcv_dev->lock, flags);
switch (dj_report.report_type) {
case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
logi_dj_recv_add_djhid_device(djrcv_dev, &dj_report);
break;
case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
logi_dj_recv_destroy_djhid_device(djrcv_dev, &dj_report);
break;
default:
/* A normal report (i. e. not belonging to a pair/unpair notification)
* arriving here, means that the report arrived but we did not have a
* paired dj_device associated to the report's device_index, this
* means that the original "device paired" notification corresponding
* to this dj_device never arrived to this driver. The reason is that
* hid-core discards all packets coming from a device while probe() is
* executing. */
if (!djrcv_dev->paired_dj_devices[dj_report.device_index]) {
/* ok, we don't know the device, just re-ask the
* receiver for the list of connected devices. */
retval = logi_dj_recv_query_paired_devices(djrcv_dev);
if (!retval) {
/* everything went fine, so just leave */
break;
}
dev_err(&djrcv_dev->hdev->dev,
"%s:logi_dj_recv_query_paired_devices "
"error:%d\n", __func__, retval);
}
dbg_hid("%s: unexpected report type\n", __func__);
}
}
static void logi_dj_recv_queue_notification(struct dj_receiver_dev *djrcv_dev,
struct dj_report *dj_report)
{
/* We are called from atomic context (tasklet && djrcv->lock held) */
kfifo_in(&djrcv_dev->notif_fifo, dj_report, sizeof(struct dj_report));
if (schedule_work(&djrcv_dev->work) == 0) {
dbg_hid("%s: did not schedule the work item, was already "
"queued\n", __func__);
}
}
static void logi_dj_recv_forward_null_report(struct dj_receiver_dev *djrcv_dev,
struct dj_report *dj_report)
{
/* We are called from atomic context (tasklet && djrcv->lock held) */
unsigned int i;
u8 reportbuffer[MAX_REPORT_SIZE];
struct dj_device *djdev;
djdev = djrcv_dev->paired_dj_devices[dj_report->device_index];
if (!djdev) {
dbg_hid("djrcv_dev->paired_dj_devices[dj_report->device_index]"
" is NULL, index %d\n", dj_report->device_index);
kfifo_in(&djrcv_dev->notif_fifo, dj_report, sizeof(struct dj_report));
if (schedule_work(&djrcv_dev->work) == 0) {
dbg_hid("%s: did not schedule the work item, was already "
"queued\n", __func__);
}
return;
}
memset(reportbuffer, 0, sizeof(reportbuffer));
for (i = 0; i < NUMBER_OF_HID_REPORTS; i++) {
if (djdev->reports_supported & (1 << i)) {
reportbuffer[0] = i;
if (hid_input_report(djdev->hdev,
HID_INPUT_REPORT,
reportbuffer,
hid_reportid_size_map[i], 1)) {
dbg_hid("hid_input_report error sending null "
"report\n");
}
}
}
}
static void logi_dj_recv_forward_report(struct dj_receiver_dev *djrcv_dev,
struct dj_report *dj_report)
{
/* We are called from atomic context (tasklet && djrcv->lock held) */
struct dj_device *dj_device;
dj_device = djrcv_dev->paired_dj_devices[dj_report->device_index];
if (dj_device == NULL) {
dbg_hid("djrcv_dev->paired_dj_devices[dj_report->device_index]"
" is NULL, index %d\n", dj_report->device_index);
kfifo_in(&djrcv_dev->notif_fifo, dj_report, sizeof(struct dj_report));
if (schedule_work(&djrcv_dev->work) == 0) {
dbg_hid("%s: did not schedule the work item, was already "
"queued\n", __func__);
}
return;
}
if ((dj_report->report_type > ARRAY_SIZE(hid_reportid_size_map) - 1) ||
(hid_reportid_size_map[dj_report->report_type] == 0)) {
dbg_hid("invalid report type:%x\n", dj_report->report_type);
return;
}
if (hid_input_report(dj_device->hdev,
HID_INPUT_REPORT, &dj_report->report_type,
hid_reportid_size_map[dj_report->report_type], 1)) {
dbg_hid("hid_input_report error\n");
}
}
static int logi_dj_recv_send_report(struct dj_receiver_dev *djrcv_dev,
struct dj_report *dj_report)
{
struct hid_device *hdev = djrcv_dev->hdev;
struct hid_report *report;
struct hid_report_enum *output_report_enum;
u8 *data = (u8 *)(&dj_report->device_index);
unsigned int i;
output_report_enum = &hdev->report_enum[HID_OUTPUT_REPORT];
report = output_report_enum->report_id_hash[REPORT_ID_DJ_SHORT];
if (!report) {
dev_err(&hdev->dev, "%s: unable to find dj report\n", __func__);
return -ENODEV;
}
for (i = 0; i < DJREPORT_SHORT_LENGTH - 1; i++)
report->field[0]->value[i] = data[i];
hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
return 0;
}
static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev)
{
struct dj_report *dj_report;
int retval;
/* no need to protect djrcv_dev->querying_devices */
if (djrcv_dev->querying_devices)
return 0;
dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
if (!dj_report)
return -ENOMEM;
dj_report->report_id = REPORT_ID_DJ_SHORT;
dj_report->device_index = 0xFF;
dj_report->report_type = REPORT_TYPE_CMD_GET_PAIRED_DEVICES;
retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
kfree(dj_report);
return retval;
}
static int logi_dj_recv_switch_to_dj_mode(struct dj_receiver_dev *djrcv_dev,
unsigned timeout)
{
struct dj_report *dj_report;
int retval;
dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
if (!dj_report)
return -ENOMEM;
dj_report->report_id = REPORT_ID_DJ_SHORT;
dj_report->device_index = 0xFF;
dj_report->report_type = REPORT_TYPE_CMD_SWITCH;
dj_report->report_params[CMD_SWITCH_PARAM_DEVBITFIELD] = 0x3F;
dj_report->report_params[CMD_SWITCH_PARAM_TIMEOUT_SECONDS] = (u8)timeout;
retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
kfree(dj_report);
/*
* Ugly sleep to work around a USB 3.0 bug when the receiver is still
* processing the "switch-to-dj" command while we send an other command.
* 50 msec should gives enough time to the receiver to be ready.
*/
msleep(50);
return retval;
}
static int logi_dj_ll_open(struct hid_device *hid)
{
dbg_hid("%s:%s\n", __func__, hid->phys);
return 0;
}
static void logi_dj_ll_close(struct hid_device *hid)
{
dbg_hid("%s:%s\n", __func__, hid->phys);
}
static int logi_dj_output_hidraw_report(struct hid_device *hid, u8 * buf,
size_t count,
unsigned char report_type)
{
/* Called by hid raw to send data */
dbg_hid("%s\n", __func__);
return 0;
}
static void rdcat(char *rdesc, unsigned int *rsize, const char *data, unsigned int size)
{
memcpy(rdesc + *rsize, data, size);
*rsize += size;
}
static int logi_dj_ll_parse(struct hid_device *hid)
{
struct dj_device *djdev = hid->driver_data;
unsigned int rsize = 0;
char *rdesc;
int retval;
dbg_hid("%s\n", __func__);
djdev->hdev->version = 0x0111;
djdev->hdev->country = 0x00;
rdesc = kmalloc(MAX_RDESC_SIZE, GFP_KERNEL);
if (!rdesc)
return -ENOMEM;
if (djdev->reports_supported & STD_KEYBOARD) {
dbg_hid("%s: sending a kbd descriptor, reports_supported: %x\n",
__func__, djdev->reports_supported);
rdcat(rdesc, &rsize, kbd_descriptor, sizeof(kbd_descriptor));
}
if (djdev->reports_supported & STD_MOUSE) {
dbg_hid("%s: sending a mouse descriptor, reports_supported: "
"%x\n", __func__, djdev->reports_supported);
rdcat(rdesc, &rsize, mse_descriptor, sizeof(mse_descriptor));
}
if (djdev->reports_supported & MULTIMEDIA) {
dbg_hid("%s: sending a multimedia report descriptor: %x\n",
__func__, djdev->reports_supported);
rdcat(rdesc, &rsize, consumer_descriptor, sizeof(consumer_descriptor));
}
if (djdev->reports_supported & POWER_KEYS) {
dbg_hid("%s: sending a power keys report descriptor: %x\n",
__func__, djdev->reports_supported);
rdcat(rdesc, &rsize, syscontrol_descriptor, sizeof(syscontrol_descriptor));
}
if (djdev->reports_supported & MEDIA_CENTER) {
dbg_hid("%s: sending a media center report descriptor: %x\n",
__func__, djdev->reports_supported);
rdcat(rdesc, &rsize, media_descriptor, sizeof(media_descriptor));
}
if (djdev->reports_supported & KBD_LEDS) {
dbg_hid("%s: need to send kbd leds report descriptor: %x\n",
__func__, djdev->reports_supported);
}
retval = hid_parse_report(hid, rdesc, rsize);
kfree(rdesc);
return retval;
}
static int logi_dj_ll_input_event(struct input_dev *dev, unsigned int type,
unsigned int code, int value)
{
/* Sent by the input layer to handle leds and Force Feedback */
struct hid_device *dj_hiddev = input_get_drvdata(dev);
struct dj_device *dj_dev = dj_hiddev->driver_data;
struct dj_receiver_dev *djrcv_dev =
dev_get_drvdata(dj_hiddev->dev.parent);
struct hid_device *dj_rcv_hiddev = djrcv_dev->hdev;
struct hid_report_enum *output_report_enum;
struct hid_field *field;
struct hid_report *report;
unsigned char *data;
int offset;
dbg_hid("%s: %s, type:%d | code:%d | value:%d\n",
__func__, dev->phys, type, code, value);
if (type != EV_LED)
return -1;
offset = hidinput_find_field(dj_hiddev, type, code, &field);
if (offset == -1) {
dev_warn(&dev->dev, "event field not found\n");
return -1;
}
hid_set_field(field, offset, value);
data = hid_alloc_report_buf(field->report, GFP_ATOMIC);
if (!data) {
dev_warn(&dev->dev, "failed to allocate report buf memory\n");
return -1;
}
hid_output_report(field->report, &data[0]);
output_report_enum = &dj_rcv_hiddev->report_enum[HID_OUTPUT_REPORT];
report = output_report_enum->report_id_hash[REPORT_ID_DJ_SHORT];
hid_set_field(report->field[0], 0, dj_dev->device_index);
hid_set_field(report->field[0], 1, REPORT_TYPE_LEDS);
hid_set_field(report->field[0], 2, data[1]);
hid_hw_request(dj_rcv_hiddev, report, HID_REQ_SET_REPORT);
kfree(data);
return 0;
}
static int logi_dj_ll_start(struct hid_device *hid)
{
dbg_hid("%s\n", __func__);
return 0;
}
static void logi_dj_ll_stop(struct hid_device *hid)
{
dbg_hid("%s\n", __func__);
}
static struct hid_ll_driver logi_dj_ll_driver = {
.parse = logi_dj_ll_parse,
.start = logi_dj_ll_start,
.stop = logi_dj_ll_stop,
.open = logi_dj_ll_open,
.close = logi_dj_ll_close,
.hidinput_input_event = logi_dj_ll_input_event,
};
static int logi_dj_raw_event(struct hid_device *hdev,
struct hid_report *report, u8 *data,
int size)
{
struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
struct dj_report *dj_report = (struct dj_report *) data;
unsigned long flags;
bool report_processed = false;
dbg_hid("%s, size:%d\n", __func__, size);
/* Here we receive all data coming from iface 2, there are 4 cases:
*
* 1) Data should continue its normal processing i.e. data does not
* come from the DJ collection, in which case we do nothing and
* return 0, so hid-core can continue normal processing (will forward
* to associated hidraw device)
*
* 2) Data is from DJ collection, and is intended for this driver i. e.
* data contains arrival, departure, etc notifications, in which case
* we queue them for delayed processing by the work queue. We return 1
* to hid-core as no further processing is required from it.
*
* 3) Data is from DJ collection, and informs a connection change,
* if the change means rf link loss, then we must send a null report
* to the upper layer to discard potentially pressed keys that may be
* repeated forever by the input layer. Return 1 to hid-core as no
* further processing is required.
*
* 4) Data is from DJ collection and is an actual input event from
* a paired DJ device in which case we forward it to the correct hid
* device (via hid_input_report() ) and return 1 so hid-core does not do
* anything else with it.
*/
spin_lock_irqsave(&djrcv_dev->lock, flags);
if (dj_report->report_id == REPORT_ID_DJ_SHORT) {
switch (dj_report->report_type) {
case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
logi_dj_recv_queue_notification(djrcv_dev, dj_report);
break;
case REPORT_TYPE_NOTIF_CONNECTION_STATUS:
if (dj_report->report_params[CONNECTION_STATUS_PARAM_STATUS] ==
STATUS_LINKLOSS) {
logi_dj_recv_forward_null_report(djrcv_dev, dj_report);
}
break;
default:
logi_dj_recv_forward_report(djrcv_dev, dj_report);
}
report_processed = true;
}
spin_unlock_irqrestore(&djrcv_dev->lock, flags);
return report_processed;
}
static int logi_dj_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
struct dj_receiver_dev *djrcv_dev;
int retval;
if (is_dj_device((struct dj_device *)hdev->driver_data))
return -ENODEV;
dbg_hid("%s called for ifnum %d\n", __func__,
intf->cur_altsetting->desc.bInterfaceNumber);
/* Ignore interfaces 0 and 1, they will not carry any data, dont create
* any hid_device for them */
if (intf->cur_altsetting->desc.bInterfaceNumber !=
LOGITECH_DJ_INTERFACE_NUMBER) {
dbg_hid("%s: ignoring ifnum %d\n", __func__,
intf->cur_altsetting->desc.bInterfaceNumber);
return -ENODEV;
}
/* Treat interface 2 */
djrcv_dev = kzalloc(sizeof(struct dj_receiver_dev), GFP_KERNEL);
if (!djrcv_dev) {
dev_err(&hdev->dev,
"%s:failed allocating dj_receiver_dev\n", __func__);
return -ENOMEM;
}
djrcv_dev->hdev = hdev;
INIT_WORK(&djrcv_dev->work, delayedwork_callback);
spin_lock_init(&djrcv_dev->lock);
if (kfifo_alloc(&djrcv_dev->notif_fifo,
DJ_MAX_NUMBER_NOTIFICATIONS * sizeof(struct dj_report),
GFP_KERNEL)) {
dev_err(&hdev->dev,
"%s:failed allocating notif_fifo\n", __func__);
kfree(djrcv_dev);
return -ENOMEM;
}
hid_set_drvdata(hdev, djrcv_dev);
/* Call to usbhid to fetch the HID descriptors of interface 2 and
* subsequently call to the hid/hid-core to parse the fetched
* descriptors, this will in turn create the hidraw and hiddev nodes
* for interface 2 of the receiver */
retval = hid_parse(hdev);
if (retval) {
dev_err(&hdev->dev,
"%s:parse of interface 2 failed\n", __func__);
goto hid_parse_fail;
}
if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, REPORT_ID_DJ_SHORT,
0, DJREPORT_SHORT_LENGTH - 1)) {
retval = -ENODEV;
goto hid_parse_fail;
}
/* Starts the usb device and connects to upper interfaces hiddev and
* hidraw */
retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (retval) {
dev_err(&hdev->dev,
"%s:hid_hw_start returned error\n", __func__);
goto hid_hw_start_fail;
}
retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
if (retval < 0) {
dev_err(&hdev->dev,
"%s:logi_dj_recv_switch_to_dj_mode returned error:%d\n",
__func__, retval);
goto switch_to_dj_mode_fail;
}
/* This is enabling the polling urb on the IN endpoint */
retval = hid_hw_open(hdev);
if (retval < 0) {
dev_err(&hdev->dev, "%s:hid_hw_open returned error:%d\n",
__func__, retval);
goto llopen_failed;
}
/* Allow incoming packets to arrive: */
hid_device_io_start(hdev);
retval = logi_dj_recv_query_paired_devices(djrcv_dev);
if (retval < 0) {
dev_err(&hdev->dev, "%s:logi_dj_recv_query_paired_devices "
"error:%d\n", __func__, retval);
goto logi_dj_recv_query_paired_devices_failed;
}
return retval;
logi_dj_recv_query_paired_devices_failed:
hid_hw_close(hdev);
llopen_failed:
switch_to_dj_mode_fail:
hid_hw_stop(hdev);
hid_hw_start_fail:
hid_parse_fail:
kfifo_free(&djrcv_dev->notif_fifo);
kfree(djrcv_dev);
hid_set_drvdata(hdev, NULL);
return retval;
}
#ifdef CONFIG_PM
static int logi_dj_reset_resume(struct hid_device *hdev)
{
int retval;
struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
if (retval < 0) {
dev_err(&hdev->dev,
"%s:logi_dj_recv_switch_to_dj_mode returned error:%d\n",
__func__, retval);
}
return 0;
}
#endif
static void logi_dj_remove(struct hid_device *hdev)
{
struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
struct dj_device *dj_dev;
int i;
dbg_hid("%s\n", __func__);
cancel_work_sync(&djrcv_dev->work);
hid_hw_close(hdev);
hid_hw_stop(hdev);
/* I suppose that at this point the only context that can access
* the djrecv_data is this thread as the work item is guaranteed to
* have finished and no more raw_event callbacks should arrive after
* the remove callback was triggered so no locks are put around the
* code below */
for (i = 0; i < (DJ_MAX_PAIRED_DEVICES + DJ_DEVICE_INDEX_MIN); i++) {
dj_dev = djrcv_dev->paired_dj_devices[i];
if (dj_dev != NULL) {
hid_destroy_device(dj_dev->hdev);
kfree(dj_dev);
djrcv_dev->paired_dj_devices[i] = NULL;
}
}
kfifo_free(&djrcv_dev->notif_fifo);
kfree(djrcv_dev);
hid_set_drvdata(hdev, NULL);
}
static int logi_djdevice_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
int ret;
struct dj_device *dj_dev = hdev->driver_data;
if (!is_dj_device(dj_dev))
return -ENODEV;
ret = hid_parse(hdev);
if (!ret)
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
return ret;
}
static const struct hid_device_id logi_dj_receivers[] = {
{HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER)},
{HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2)},
{}
};
MODULE_DEVICE_TABLE(hid, logi_dj_receivers);
static struct hid_driver logi_djreceiver_driver = {
.name = "logitech-djreceiver",
.id_table = logi_dj_receivers,
.probe = logi_dj_probe,
.remove = logi_dj_remove,
.raw_event = logi_dj_raw_event,
#ifdef CONFIG_PM
.reset_resume = logi_dj_reset_resume,
#endif
};
static const struct hid_device_id logi_dj_devices[] = {
{HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER)},
{HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2)},
{}
};
static struct hid_driver logi_djdevice_driver = {
.name = "logitech-djdevice",
.id_table = logi_dj_devices,
.probe = logi_djdevice_probe,
};
static int __init logi_dj_init(void)
{
int retval;
dbg_hid("Logitech-DJ:%s\n", __func__);
retval = hid_register_driver(&logi_djreceiver_driver);
if (retval)
return retval;
retval = hid_register_driver(&logi_djdevice_driver);
if (retval)
hid_unregister_driver(&logi_djreceiver_driver);
return retval;
}
static void __exit logi_dj_exit(void)
{
dbg_hid("Logitech-DJ:%s\n", __func__);
hid_unregister_driver(&logi_djdevice_driver);
hid_unregister_driver(&logi_djreceiver_driver);
}
module_init(logi_dj_init);
module_exit(logi_dj_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Logitech");
MODULE_AUTHOR("Nestor Lopez Casado");
MODULE_AUTHOR("nlopezcasad@logitech.com");
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