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Bluetooth: hci_bcm: Add serdev support

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Add basic support for Broadcom serial slave devices.
Probe the serial device, retrieve its maximum speed and
register a new hci uart device.

Tested/compatible with bcm43438 (RPi3).

Signed-off-by: Loic Poulain <loic.poulain@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Loic Poulain 2017-08-17 19:59:51 +02:00 committed by Marcel Holtmann
parent e76dc1dd00
commit 33cd149e76
2 changed files with 84 additions and 2 deletions
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1
drivers/bluetooth/Kconfig
View File

@ -168,6 +168,7 @@ config BT_HCIUART_INTEL
config BT_HCIUART_BCM
bool "Broadcom protocol support"
depends on BT_HCIUART
depends on BT_HCIUART_SERDEV
select BT_HCIUART_H4
select BT_BCM
help

85
drivers/bluetooth/hci_bcm.c
View File

@ -27,6 +27,8 @@
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/property.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
@ -34,6 +36,7 @@
#include <linux/interrupt.h>
#include <linux/dmi.h>
#include <linux/pm_runtime.h>
#include <linux/serdev.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
@ -46,6 +49,7 @@
#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
/* platform device driver resources */
struct bcm_device {
struct list_head list;
@ -69,6 +73,12 @@ struct bcm_device {
#endif
};
/* serdev driver resources */
struct bcm_serdev {
struct hci_uart hu;
};
/* generic bcm uart resources */
struct bcm_data {
struct sk_buff *rx_skb;
struct sk_buff_head txq;
@ -80,6 +90,14 @@ struct bcm_data {
static DEFINE_MUTEX(bcm_device_lock);
static LIST_HEAD(bcm_device_list);
static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
{
if (hu->serdev)
serdev_device_set_baudrate(hu->serdev, speed);
else
hci_uart_set_baudrate(hu, speed);
}
static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
{
struct hci_dev *hdev = hu->hdev;
@ -290,6 +308,14 @@ static int bcm_open(struct hci_uart *hu)
hu->priv = bcm;
/* If this is a serdev defined device, then only use
* serdev open primitive and skip the rest.
*/
if (hu->serdev) {
serdev_device_open(hu->serdev);
goto out;
}
if (!hu->tty->dev)
goto out;
@ -325,6 +351,12 @@ static int bcm_close(struct hci_uart *hu)
bt_dev_dbg(hu->hdev, "hu %p", hu);
/* If this is a serdev defined device, only use serdev
* close primitive and then continue as usual.
*/
if (hu->serdev)
serdev_device_close(hu->serdev);
/* Protect bcm->dev against removal of the device or driver */
mutex_lock(&bcm_device_lock);
if (bcm_device_exists(bdev)) {
@ -400,7 +432,7 @@ static int bcm_setup(struct hci_uart *hu)
speed = 0;
if (speed)
hci_uart_set_baudrate(hu, speed);
host_set_baudrate(hu, speed);
/* Operational speed if any */
if (hu->oper_speed)
@ -413,7 +445,7 @@ static int bcm_setup(struct hci_uart *hu)
if (speed) {
err = bcm_set_baudrate(hu, speed);
if (!err)
hci_uart_set_baudrate(hu, speed);
host_set_baudrate(hu, speed);
}
finalize:
@ -906,9 +938,57 @@ static struct platform_driver bcm_driver = {
},
};
static int bcm_serdev_probe(struct serdev_device *serdev)
{
struct bcm_serdev *bcmdev;
u32 speed;
int err;
bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
if (!bcmdev)
return -ENOMEM;
bcmdev->hu.serdev = serdev;
serdev_device_set_drvdata(serdev, bcmdev);
err = device_property_read_u32(&serdev->dev, "max-speed", &speed);
if (!err)
bcmdev->hu.oper_speed = speed;
return hci_uart_register_device(&bcmdev->hu, &bcm_proto);
}
static void bcm_serdev_remove(struct serdev_device *serdev)
{
struct bcm_serdev *bcmdev = serdev_device_get_drvdata(serdev);
hci_uart_unregister_device(&bcmdev->hu);
}
#ifdef CONFIG_OF
static const struct of_device_id bcm_bluetooth_of_match[] = {
{ .compatible = "brcm,bcm43438-bt" },
{ },
};
MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
#endif
static struct serdev_device_driver bcm_serdev_driver = {
.probe = bcm_serdev_probe,
.remove = bcm_serdev_remove,
.driver = {
.name = "hci_uart_bcm",
.of_match_table = of_match_ptr(bcm_bluetooth_of_match),
},
};
int __init bcm_init(void)
{
/* For now, we need to keep both platform device
* driver (ACPI generated) and serdev driver (DT).
*/
platform_driver_register(&bcm_driver);
serdev_device_driver_register(&bcm_serdev_driver);
return hci_uart_register_proto(&bcm_proto);
}
@ -916,6 +996,7 @@ int __init bcm_init(void)
int __exit bcm_deinit(void)
{
platform_driver_unregister(&bcm_driver);
serdev_device_driver_unregister(&bcm_serdev_driver);
return hci_uart_unregister_proto(&bcm_proto);
}