[PATCH] HID: nintendo: use ida for LED player id

[Martino Fontana <tinozzo123@gmail.com>]

Signed-off-by: Martino Fontana <tinozzo123@gmail.com>
---
 drivers/hid/hid-nintendo.c | 29 ++++++++++++++---------------
 1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/drivers/hid/hid-nintendo.c b/drivers/hid/hid-nintendo.c
index 138f154fe..22a3c97a0 100644
--- a/drivers/hid/hid-nintendo.c
+++ b/drivers/hid/hid-nintendo.c
@@ -28,6 +28,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/hid.h>
+#include <linux/idr.h>
 #include <linux/input.h>
 #include <linux/jiffies.h>
 #include <linux/leds.h>
@@ -427,6 +428,7 @@ static const enum led_brightness joycon_player_led_patterns[JC_NUM_LED_PATTERNS]
 struct joycon_ctlr {
 	struct hid_device *hdev;
 	struct input_dev *input;
+	u32 player_id;
 	struct led_classdev leds[JC_NUM_LEDS]; /* player leds */
 	struct led_classdev home_led;
 	enum joycon_ctlr_state ctlr_state;
@@ -1917,7 +1919,8 @@ static int joycon_home_led_brightness_set(struct led_classdev *led,
 	return ret;
 }
 
-static DEFINE_SPINLOCK(joycon_input_num_spinlock);
+static DEFINE_IDA(nintendo_player_id_allocator);
+
 static int joycon_leds_create(struct joycon_ctlr *ctlr)
 {
 	struct hid_device *hdev = ctlr->hdev;
@@ -1928,20 +1931,15 @@ static int joycon_leds_create(struct joycon_ctlr *ctlr)
 	char *name;
 	int ret;
 	int i;
-	unsigned long flags;
-	int player_led_pattern;
-	static int input_num;
-
-	/*
-	 * Set the player leds based on controller number
-	 * Because there is no standard concept of "player number", the pattern
-	 * number will simply increase by 1 every time a controller is connected.
-	 */
-	spin_lock_irqsave(&joycon_input_num_spinlock, flags);
-	player_led_pattern = input_num++ % JC_NUM_LED_PATTERNS;
-	spin_unlock_irqrestore(&joycon_input_num_spinlock, flags);
 
 	/* configure the player LEDs */
+	ret = ida_alloc(&nintendo_player_id_allocator, GFP_KERNEL);
+	if (ret < 0) {
+		hid_warn(hdev, "Failed to allocate player ID, skipping; ret=%d\n", ret);
+		goto home_led;
+	}
+	ctlr->player_id = ret % JC_NUM_LED_PATTERNS;
+
 	for (i = 0; i < JC_NUM_LEDS; i++) {
 		name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s:%s",
 				      d_name,
@@ -1952,13 +1950,13 @@ static int joycon_leds_create(struct joycon_ctlr *ctlr)
 
 		led = &ctlr->leds[i];
 		led->name = name;
-		led->brightness = joycon_player_led_patterns[player_led_pattern][i];
+		led->brightness = joycon_player_led_patterns[ctlr->player_id][i];
 		led->max_brightness = 1;
 		led->brightness_set_blocking =
 					joycon_player_led_brightness_set;
 		led->flags = LED_CORE_SUSPENDRESUME | LED_HW_PLUGGABLE;
 
-		led_val |= joycon_player_led_patterns[player_led_pattern][i] << i;
+		led_val |= joycon_player_led_patterns[ctlr->player_id][i] << i;
 	}
 	mutex_lock(&ctlr->output_mutex);
 	ret = joycon_set_player_leds(ctlr, 0, led_val);
@@ -2410,6 +2408,7 @@ static void nintendo_hid_remove(struct hid_device *hdev)
 	spin_unlock_irqrestore(&ctlr->lock, flags);
 
 	destroy_workqueue(ctlr->rumble_queue);
+	ida_free(&nintendo_player_id_allocator, ctlr->player_id);
 
 	hid_hw_close(hdev);
 	hid_hw_stop(hdev);
-- 
2.42.0