Bluetooth: add LED trigger for indicating HCI is powered up

Add support for LED triggers to the Bluetooth subsystem and add kernel
config symbol BT_LEDS for it.

For now one trigger for indicating "HCI is powered up" is supported.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Heiner Kallweit 2016-01-08 19:28:58 +01:00 committed by Marcel Holtmann
parent a30a9ea6e2
commit 6d5d2ee63c
6 changed files with 119 additions and 0 deletions

View file

@ -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>
@ -396,6 +397,8 @@ 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);

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@ -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

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@ -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

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@ -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);

80
net/bluetooth/leds.c Normal file
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@ -0,0 +1,80 @@
/*
* Copyright 2015, Heiner Kallweit <hkallweit1@gmail.com>
*
* 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, \
struct hci_basic_led_trigger, led_trigger)
void hci_leds_update_powered(struct hci_dev *hdev, bool enabled)
{
if (hdev->power_led)
led_trigger_event(hdev->power_led,
enabled ? LED_FULL : LED_OFF);
}
static void power_activate(struct led_classdev *led_cdev)
{
struct hci_basic_led_trigger *htrig;
bool powered;
htrig = to_hci_basic_led_trigger(led_cdev->trigger);
powered = test_bit(HCI_UP, &htrig->hdev->flags);
led_trigger_event(led_cdev->trigger, powered ? LED_FULL : LED_OFF);
}
static struct led_trigger *led_allocate_basic(struct hci_dev *hdev,
void (*activate)(struct led_classdev *led_cdev),
const char *name)
{
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 = led_allocate_basic(hdev, power_activate, "power");
}
void hci_leds_exit(struct hci_dev *hdev)
{
if (hdev->power_led)
led_trigger_unregister(hdev->power_led);
}

18
net/bluetooth/leds.h Normal file
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@ -0,0 +1,18 @@
/*
* Copyright 2015, Heiner Kallweit <hkallweit1@gmail.com>
*
* 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.
*/
#if IS_ENABLED(CONFIG_BT_LEDS)
void hci_leds_update_powered(struct hci_dev *hdev, bool enabled);
void hci_leds_init(struct hci_dev *hdev);
void hci_leds_exit(struct hci_dev *hdev);
#else
static inline void hci_leds_update_powered(struct hci_dev *hdev,
bool enabled) {}
static inline void hci_leds_init(struct hci_dev *hdev) {}
static inline void hci_leds_exit(struct hci_dev *hdev) {}
#endif