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Input: xpad - use ida() for finding the pad_nr

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The pad_nr corresponds to the lit up LED on the controller. Therefore there
should be no gaps when enumerating. Currently a LED is only re-assigned
after a controller is re-connected 4 times.

This patch uses ida to track connected pads - this way we can re-assign
freed up pad number immediately.

Consider the following case:
1. pad A is connected and gets pad_nr = 0
2. pad B is connected and gets pad_nr = 1
3. pad A is disconnected
4. pad A is connected again

using ida_simple_get() controller A now correctly gets pad_nr = 0 again.

Signed-off-by: Pavel Rojtberg <rojtberg@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Pavel Rojtberg 2015-10-10 10:00:49 -07:00 committed by Dmitry Torokhov
parent 1f6f02b728
commit e3b651745a
1 changed files with 20 additions and 12 deletions
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32
drivers/input/joystick/xpad.c
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@ -243,7 +243,6 @@ static const signed short xpad_btn_triggers[] = {
-1
};
static const signed short xpad360_btn[] = { /* buttons for x360 controller */
BTN_TL, BTN_TR, /* Button LB/RB */
BTN_MODE, /* The big X button */
@ -345,7 +344,7 @@ struct usb_xpad {
int mapping; /* map d-pad to buttons or to axes */
int xtype; /* type of xbox device */
unsigned long pad_nr; /* the order x360 pads were attached */
int pad_nr; /* the order x360 pads were attached */
};
/*
@ -881,6 +880,9 @@ static int xpad_init_ff(struct usb_xpad *xpad) { return 0; }
#if defined(CONFIG_JOYSTICK_XPAD_LEDS)
#include <linux/leds.h>
#include <linux/idr.h>
static DEFINE_IDA(xpad_pad_seq);
struct xpad_led {
char name[16];
@ -962,7 +964,6 @@ static void xpad_led_set(struct led_classdev *led_cdev,
static int xpad_led_probe(struct usb_xpad *xpad)
{
static atomic_t led_seq = ATOMIC_INIT(-1);
struct xpad_led *led;
struct led_classdev *led_cdev;
int error;
@ -974,9 +975,13 @@ static int xpad_led_probe(struct usb_xpad *xpad)
if (!led)
return -ENOMEM;
xpad->pad_nr = atomic_inc_return(&led_seq);
xpad->pad_nr = ida_simple_get(&xpad_pad_seq, 0, 0, GFP_KERNEL);
if (xpad->pad_nr < 0) {
error = xpad->pad_nr;
goto err_free_mem;
}
snprintf(led->name, sizeof(led->name), "xpad%lu", xpad->pad_nr);
snprintf(led->name, sizeof(led->name), "xpad%d", xpad->pad_nr);
led->xpad = xpad;
led_cdev = &led->led_cdev;
@ -984,16 +989,19 @@ static int xpad_led_probe(struct usb_xpad *xpad)
led_cdev->brightness_set = xpad_led_set;
error = led_classdev_register(&xpad->udev->dev, led_cdev);
if (error) {
kfree(led);
xpad->led = NULL;
return error;
}
if (error)
goto err_free_id;
/* Light up the segment corresponding to controller number */
xpad_identify_controller(xpad);
return 0;
err_free_id:
ida_simple_remove(&xpad_pad_seq, xpad->pad_nr);
err_free_mem:
kfree(led);
xpad->led = NULL;
return error;
}
static void xpad_led_disconnect(struct usb_xpad *xpad)
@ -1002,6 +1010,7 @@ static void xpad_led_disconnect(struct usb_xpad *xpad)
if (xpad_led) {
led_classdev_unregister(&xpad_led->led_cdev);
ida_simple_remove(&xpad_pad_seq, xpad->pad_nr);
kfree(xpad_led);
}
}
@ -1011,7 +1020,6 @@ static void xpad_led_disconnect(struct usb_xpad *xpad) { }
static void xpad_identify_controller(struct usb_xpad *xpad) { }
#endif
static int xpad_open(struct input_dev *dev)
{
struct usb_xpad *xpad = input_get_drvdata(dev);