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@xxxxxxxxx>
---
v2: dt-bindings as separate patch
rebase on upcoming pi3 dts changes
drivers/bluetooth/hci_bcm.c | 82 ++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 78 insertions(+), 4 deletions(-)
diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 6b42372..f824738 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -27,6 +27,7 @@
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/acpi.h>
+#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
@@ -34,6 +35,7 @@
#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 +48,7 @@
#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
+/* platform device driver resources */
struct bcm_device {
struct list_head list;
@@ -68,6 +71,12 @@ struct bcm_device {
#endif
};
+/* serdev driver resources */
+struct bcm_bt_device {
+ struct hci_uart hu;
+};
+
+/* generic bcm uart resources */
struct bcm_data {
struct sk_buff *rx_skb;
struct sk_buff_head txq;
@@ -289,6 +298,11 @@ static int bcm_open(struct hci_uart *hu)
hu->priv = bcm;
+ if (hu->serdev) {
+ serdev_device_open(hu->serdev);
+ goto out;
+ }
+
if (!hu->tty->dev)
goto out;
@@ -323,6 +337,9 @@ static int bcm_close(struct hci_uart *hu)
bt_dev_dbg(hu->hdev, "hu %p", hu);
+ 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)) {
@@ -397,8 +414,12 @@ static int bcm_setup(struct hci_uart *hu)
else
speed = 0;
- if (speed)
- hci_uart_set_baudrate(hu, speed);
+ if (speed) {
+ if (hu->serdev)
+ serdev_device_set_baudrate(hu->serdev, speed);
+ else
+ hci_uart_set_baudrate(hu, speed);
+ }
/* Operational speed if any */
if (hu->oper_speed)
@@ -410,8 +431,12 @@ static int bcm_setup(struct hci_uart *hu)
if (speed) {
err = bcm_set_baudrate(hu, speed);
- if (!err)
- hci_uart_set_baudrate(hu, speed);
+ if (!err) {
+ if (hu->serdev)
+ serdev_device_set_baudrate(hu->serdev, speed);
+ else
+ hci_uart_set_baudrate(hu, speed);
+ }
}
finalize:
@@ -903,9 +928,57 @@ static int bcm_remove(struct platform_device *pdev)
},
};
+static int bcm_serdev_probe(struct serdev_device *serdev)
+{
+ struct bcm_bt_device *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 = of_property_read_u32(serdev->dev.of_node, "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_bt_device *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);
}
@@ -913,6 +986,7 @@ 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);
}
--
1.9.1
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