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HID: usbhid: defer LED setting to a workqueue 

Defer LED setting action to a workqueue.
This is more likely to send all LED change events in a single URB.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Daniel Kurtz 2011-11-17 19:23:50 +08:00 committed by Jiri Kosina
parent f0befcd64b
commit 4371ea8202
4 changed files with 82 additions and 11 deletions
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42
drivers/hid/hid-input.c
View File

@ -976,6 +976,48 @@ int hidinput_find_field(struct hid_device *hid, unsigned int type, unsigned int
}
EXPORT_SYMBOL_GPL(hidinput_find_field);
struct hid_field *hidinput_get_led_field(struct hid_device *hid)
{
struct hid_report *report;
struct hid_field *field;
int i, j;
list_for_each_entry(report,
&hid->report_enum[HID_OUTPUT_REPORT].report_list,
list) {
for (i = 0; i < report->maxfield; i++) {
field = report->field[i];
for (j = 0; j < field->maxusage; j++)
if (field->usage[j].type == EV_LED)
return field;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(hidinput_get_led_field);
unsigned int hidinput_count_leds(struct hid_device *hid)
{
struct hid_report *report;
struct hid_field *field;
int i, j;
unsigned int count = 0;
list_for_each_entry(report,
&hid->report_enum[HID_OUTPUT_REPORT].report_list,
list) {
for (i = 0; i < report->maxfield; i++) {
field = report->field[i];
for (j = 0; j < field->maxusage; j++)
if (field->usage[j].type == EV_LED &&
field->value[j])
count += 1;
}
}
return count;
}
EXPORT_SYMBOL_GPL(hidinput_count_leds);
static int hidinput_open(struct input_dev *dev)
{
struct hid_device *hid = input_get_drvdata(dev);

47
drivers/hid/usbhid/hid-core.c
View File

@ -602,6 +602,30 @@ void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, uns
}
EXPORT_SYMBOL_GPL(usbhid_submit_report);
/* Workqueue routine to send requests to change LEDs */
static void hid_led(struct work_struct *work)
{
struct usbhid_device *usbhid =
container_of(work, struct usbhid_device, led_work);
struct hid_device *hid = usbhid->hid;
struct hid_field *field;
unsigned long flags;
field = hidinput_get_led_field(hid);
if (!field) {
hid_warn(hid, "LED event field not found\n");
return;
}
spin_lock_irqsave(&usbhid->lock, flags);
if (!test_bit(HID_DISCONNECTED, &usbhid->iofl)) {
usbhid->ledcount = hidinput_count_leds(hid);
hid_dbg(usbhid->hid, "New ledcount = %u\n", usbhid->ledcount);
__usbhid_submit_report(hid, field->report, USB_DIR_OUT);
}
spin_unlock_irqrestore(&usbhid->lock, flags);
}
static int usb_hidinput_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
struct hid_device *hid = input_get_drvdata(dev);
@ -621,17 +645,15 @@ static int usb_hidinput_input_event(struct input_dev *dev, unsigned int type, un
return -1;
}
spin_lock_irqsave(&usbhid->lock, flags);
hid_set_field(field, offset, value);
if (value) {
spin_lock_irqsave(&usbhid->lock, flags);
usbhid->ledcount++;
spin_unlock_irqrestore(&usbhid->lock, flags);
} else {
spin_lock_irqsave(&usbhid->lock, flags);
usbhid->ledcount--;
spin_unlock_irqrestore(&usbhid->lock, flags);
}
usbhid_submit_report(hid, field->report, USB_DIR_OUT);
spin_unlock_irqrestore(&usbhid->lock, flags);
/*
* Defer performing requested LED action.
* This is more likely gather all LED changes into a single URB.
*/
schedule_work(&usbhid->led_work);
return 0;
}
@ -1126,7 +1148,7 @@ static void usbhid_stop(struct hid_device *hid)
return;
clear_bit(HID_STARTED, &usbhid->iofl);
spin_lock_irq(&usbhid->lock); /* Sync with error handler */
spin_lock_irq(&usbhid->lock); /* Sync with error and led handlers */
set_bit(HID_DISCONNECTED, &usbhid->iofl);
spin_unlock_irq(&usbhid->lock);
usb_kill_urb(usbhid->urbin);
@ -1260,6 +1282,8 @@ static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *
setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
spin_lock_init(&usbhid->lock);
INIT_WORK(&usbhid->led_work, hid_led);
ret = hid_add_device(hid);
if (ret) {
if (ret != -ENODEV)
@ -1292,6 +1316,7 @@ static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
{
del_timer_sync(&usbhid->io_retry);
cancel_work_sync(&usbhid->reset_work);
cancel_work_sync(&usbhid->led_work);
}
static void hid_cease_io(struct usbhid_device *usbhid)

2
drivers/hid/usbhid/usbhid.h
View File

@ -96,6 +96,8 @@ struct usbhid_device {
struct work_struct reset_work; /* Task context for resets */
wait_queue_head_t wait; /* For sleeping */
int ledcount; /* counting the number of active leds */
struct work_struct led_work; /* Task context for setting LEDs */
};
#define hid_to_usb_dev(hid_dev) \

2
include/linux/hid.h
View File

@ -727,6 +727,8 @@ extern void hidinput_disconnect(struct hid_device *);
int hid_set_field(struct hid_field *, unsigned, __s32);
int hid_input_report(struct hid_device *, int type, u8 *, int, int);
int hidinput_find_field(struct hid_device *hid, unsigned int type, unsigned int code, struct hid_field **field);
struct hid_field *hidinput_get_led_field(struct hid_device *hid);
unsigned int hidinput_count_leds(struct hid_device *hid);
void hid_output_report(struct hid_report *report, __u8 *data);
struct hid_device *hid_allocate_device(void);
struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id);