Hi Peter,
>> 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>
>> ---
>> 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);
>> +}
>
> I'm seeing the following warning when building this with Fedora-26/gcc7:
>
> drivers/bluetooth/hci_bcm.c: In function 'bcm_serdev_remove':
> drivers/bluetooth/hci_bcm.c:953:2: error: implicit declaration of
> function 'hci_uart_unregister_device'; did you mean
> 'hci_uart_register_device'? [-Werror=implicit-function-declaration]
> hci_uart_unregister_device(&bcmdev->hu);
> ^~~~~~~~~~~~~~~~~~~~~~~~~~
> hci_uart_register_device
> cc1: some warnings being treated as errors
you might be missing some patches that are already in bluetooth-next and net-next.
Regards
Marcel
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