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Commit ae056908 authored by Frederic Danis's avatar Frederic Danis Committed by Marcel Holtmann
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Bluetooth: hci_bcm: Retrieve UART speed from ACPI 



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: default avatarFrederic Danis <frederic.danis@linux.intel.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 9e608093

drivers/bluetooth/hci_bcm.c

+28 −0
Original line number Diff line number Diff line
@@ -49,6 +49,8 @@ struct bcm_device { 


	struct clk		*clk;

	bool			clk_enabled;



	u32			init_speed;

};



struct bcm_data {
@@ -167,6 +169,7 @@ static int bcm_open(struct hci_uart *hu) 
		 */

		if (hu->tty->dev->parent == dev->pdev->dev.parent) {

			bcm->dev = dev;

			hu->init_speed = dev->init_speed;

			break;

		}

	}
@@ -324,11 +327,29 @@ 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);
@@ -368,6 +389,13 @@ 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;

}