Parse platform_device's ACPI to retrieve UART init speed.
When BCM device is open, check if its TTY has same parent as one of the
platform devices saved. If yes, use platform_device's init speed.
Signed-off-by: Frederic Danis <frederic.danis@xxxxxxxxxxxxxxx>
---
drivers/bluetooth/hci_bcm.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 856cb48..ac64bc1 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -49,6 +49,8 @@ struct bcm_device {
struct clk *clk;
bool clk_enabled;
+
+ u32 init_speed;
};
struct bcm_data {
@@ -149,6 +151,7 @@ static int bcm_open(struct hci_uart *hu)
dev = list_entry(ptr, struct bcm_device, list);
if (hu->tty->dev->parent == dev->pdev->dev.parent) {
bcm->dev = dev;
+ hu->init_speed = dev->init_speed;
break;
}
}
@@ -302,11 +305,29 @@ static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
{ },
};
+static int bcm_resource(struct acpi_resource *ares, void *data)
+{
+ struct bcm_device *dev = data;
+
+ if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
+ struct acpi_resource_uart_serialbus *sb;
+
+ sb = &ares->data.uart_serial_bus;
+ if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
+ dev->init_speed = sb->default_baud_rate;
+ }
+
+ /* Always tell the ACPI core to skip this resource */
+ return 1;
+}
+
static int bcm_acpi_probe(struct bcm_device *dev)
{
struct platform_device *pdev = dev->pdev;
const struct acpi_device_id *id;
struct gpio_desc *gpio;
+ struct acpi_device *adev;
+ LIST_HEAD(resources);
int ret;
id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
@@ -346,6 +367,13 @@ static int bcm_acpi_probe(struct bcm_device *dev)
return -EINVAL;
}
+ /* Retrieve UART ACPI info */
+ adev = ACPI_COMPANION(&dev->pdev->dev);
+ if (!adev)
+ return 0;
+
+ acpi_dev_get_resources(adev, &resources, bcm_resource, dev);
+
return 0;
}
--
1.9.1
--
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