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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: Frederic Danis <frederic.danis@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Frederic Danis 2015-08-11 16:35:37 +02:00 committed by Marcel Holtmann
parent 9e6080936c
commit ae05690886
1 changed files with 28 additions and 0 deletions
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28
drivers/bluetooth/hci_bcm.c
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@ -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;
}