bluetooth: core: RfC - add basic LED triggers

In the bluetooth subsystem I miss the option to use LEDs to indicate the status. This patch is loosely based on the LED triggers in mac80211 and adds a basic LED trigger (powered up) plus a config option to enable the BT LED triggers.

It works fine on my system however I don't know the bluetooth stack in too much detail and therefore appreciate any comment.

Signed-off-by Heiner Kallweit <[email protected]>

---
v2:
- completely rewrote the code to be as generic as possible and minimize the changes to struct hci_dev
- make the details of the LED triggers opaque to struct hci_dev
- avoid using ifdef CONFIG_BT_LEDS in hci_core.h
- start with the radio trigger only
- factor out the generic basic led trigger code to facilitate adding further basic LED triggers
- fix indentation in Kconfig
- rename led.[ch] to leds.[ch]
v3:
- use term power instead of radio
- rename hci_led_ to hci_leds_
- remove the counter
- use IS_ENABLED for checking the config option
---

include/net/bluetooth/hci_core.h |  3 ++
net/bluetooth/Kconfig            |  9 +++++
net/bluetooth/Makefile           |  1 +
net/bluetooth/hci_core.c         |  8 ++++
net/bluetooth/leds.c             | 83 ++++++++++++++++++++++++++++++++++++++++
net/bluetooth/leds.h             | 18 +++++++++
6 files changed, 122 insertions(+)

create mode 100644 net/bluetooth/leds.c
create mode 100644 net/bluetooth/leds.h

include/net/bluetooth/hci_core.h +3 -0

index c95e032..0f084b4 100644
@@ -25,6 +25,7 @@
 #ifndef __HCI_CORE_H
 #define __HCI_CORE_H
 
+#include <linux/leds.h>
 #include <net/bluetooth/hci.h>
 #include <net/bluetooth/hci_sock.h>
 

@@ -395,6 +396,8 @@ struct hci_dev {
 	struct delayed_work	rpa_expired;
 	bdaddr_t		rpa;
 
+	struct led_trigger	*power_led;
+
 	int (*open)(struct hci_dev *hdev);
 	int (*close)(struct hci_dev *hdev);
 	int (*flush)(struct hci_dev *hdev);

net/bluetooth/Kconfig +9 -0

index 95d1a66..06c31b9 100644
@@ -69,6 +69,15 @@ config BT_6LOWPAN
 	help
 	  IPv6 compression over Bluetooth Low Energy.
 
+config BT_LEDS
+	bool "Enable LED triggers"
+	depends on BT
+	depends on LEDS_CLASS
+	select LEDS_TRIGGERS
+	help
+	  This option selects a few LED triggers for different
+	  Bluetooth events.
+

config BT_SELFTEST

	bool "Bluetooth self testing support"
	depends on BT && DEBUG_KERNEL

net/bluetooth/Makefile +0 -0

index 2b15ae8..b3ff12e 100644
@@ -17,6 +17,7 @@ bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o \
 

bluetooth-$(CONFIG_BT_BREDR) += sco.o
bluetooth-$(CONFIG_BT_HS) += a2mp.o amp.o
+bluetooth-$(CONFIG_BT_LEDS) += leds.o
bluetooth-$(CONFIG_BT_DEBUGFS) += hci_debugfs.o
bluetooth-$(CONFIG_BT_SELFTEST) += selftest.o

net/bluetooth/hci_core.c +8 -0

index 47bcef7..06f603a 100644
@@ -40,6 +40,7 @@
 #include "hci_request.h"
 #include "hci_debugfs.h"
 #include "smp.h"
+#include "leds.h"
 
 static void hci_rx_work(struct work_struct *work);
 static void hci_cmd_work(struct work_struct *work);

@@ -1395,6 +1396,7 @@ static int hci_dev_do_open(struct hci_dev *hdev)
 		hci_dev_set_flag(hdev, HCI_RPA_EXPIRED);
 		set_bit(HCI_UP, &hdev->flags);
 		hci_sock_dev_event(hdev, HCI_DEV_UP);
+		hci_leds_update_powered(hdev, true);
 		if (!hci_dev_test_flag(hdev, HCI_SETUP) &&
 		    !hci_dev_test_flag(hdev, HCI_CONFIG) &&
 		    !hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&

@@ -1532,6 +1534,8 @@ int hci_dev_do_close(struct hci_dev *hdev)
 		return 0;
 	}
 
+	hci_leds_update_powered(hdev, false);
+
 	/* Flush RX and TX works */
 	flush_work(&hdev->tx_work);
 	flush_work(&hdev->rx_work);

@@ -3067,6 +3071,8 @@ int hci_register_dev(struct hci_dev *hdev)
 	if (error < 0)
 		goto err_wqueue;
 
+	hci_leds_init(hdev);
+
 	hdev->rfkill = rfkill_alloc(hdev->name, &hdev->dev,
 				    RFKILL_TYPE_BLUETOOTH, &hci_rfkill_ops,
 				    hdev);

@@ -3128,6 +3134,8 @@ void hci_unregister_dev(struct hci_dev *hdev)
 
 	id = hdev->id;
 
+	hci_leds_exit(hdev);
+
 	write_lock(&hci_dev_list_lock);
 	list_del(&hdev->list);
 	write_unlock(&hci_dev_list_lock);

net/bluetooth/leds.c new file +19 -0

new file mode 100644
index 0000000..9172c53
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2015, Heiner Kallweit <[email protected]>
+ *
+ * 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.
+ */
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "leds.h"
+
+struct hci_basic_led_trigger {
+	struct led_trigger	led_trigger;
+	struct hci_dev		*hdev;
+};
+
+#define to_hci_basic_led_trigger(arg) container_of(arg, \

net/bluetooth/leds.c new file +31 -0

+{
+	struct hci_basic_led_trigger *htrig;
+
+	htrig =	devm_kzalloc(&hdev->dev, sizeof(*htrig), GFP_KERNEL);
+	if (!htrig)
+		return NULL;
+
+	htrig->hdev = hdev;
+	htrig->led_trigger.activate = activate;
+	htrig->led_trigger.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
+						 "%s-%s", hdev->name,
+						 name);
+	if (!htrig->led_trigger.name)
+		goto err_alloc;
+
+	if (led_trigger_register(&htrig->led_trigger))
+		goto err_register;
+
+	return &htrig->led_trigger;
+
+err_register:
+	devm_kfree(&hdev->dev, (void *)htrig->led_trigger.name);
+err_alloc:
+	devm_kfree(&hdev->dev, htrig);
+	return NULL;
+}
+
+void hci_leds_init(struct hci_dev *hdev)
+{
+	/* initialize power_led */
+	hdev->power_led = hci_basic_led_allocate(hdev,

net/bluetooth/leds.h new file +8 -0

new file mode 100644
index 0000000..068261a
@@ -0,0 +1,18 @@
+/*
+ * Copyright 2015, Heiner Kallweit <[email protected]>
+ *
+ * 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.
+ */
+