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ACPI: scan: Create platform device for BCM4752 and LNV4752 ACPI nodes 

[ Upstream commit f85196bdd5 ]

BCM4752 and LNV4752 ACPI nodes describe a Broadcom 4752 GPS module
attached to an UART of the system.

The GPS modules talk a custom protocol which only works with a closed-
source Android gpsd daemon which knows this protocol.

The ACPI nodes also describe GPIOs to turn the GPS on/off these are
handled by the net/rfkill/rfkill-gpio.c code. This handling predates the
addition of enumeration of ACPI instantiated serdevs to the kernel and
was broken by that addition, because the ACPI scan code now no longer
instantiates platform_device-s for these nodes.

Rename the i2c_multi_instantiate_ids HID list to ignore_serial_bus_ids
and add the BCM4752 and LNV4752 HIDs, so that rfkill-gpio gets
a platform_device to bind to again; and so that a tty cdev for gpsd
gets created for these.

Fixes: e361d1f858 ("ACPI / scan: Fix enumeration for special UART devices")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hans de Goede 2021-12-30 12:57:47 +01:00 committed by Greg Kroah-Hartman
parent 0a9b1fb2a7
commit 5d2fd6fff8
1 changed files with 10 additions and 3 deletions
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13
drivers/acpi/scan.c
View File

@ -1690,6 +1690,7 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
{
struct list_head resource_list;
bool is_serial_bus_slave = false;
static const struct acpi_device_id ignore_serial_bus_ids[] = {
/*
* These devices have multiple I2cSerialBus resources and an i2c-client
* must be instantiated for each, each with its own i2c_device_id.
@ -1698,11 +1699,18 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
* drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
* which i2c_device_id to use for each resource.
*/
static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
{"BSG1160", },
{"BSG2150", },
{"INT33FE", },
{"INT3515", },
/*
* HIDs of device with an UartSerialBusV2 resource for which userspace
* expects a regular tty cdev to be created (instead of the in kernel
* serdev) and which have a kernel driver which expects a platform_dev
* such as the rfkill-gpio driver.
*/
{"BCM4752", },
{"LNV4752", },
{}
};
@ -1716,8 +1724,7 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
fwnode_property_present(&device->fwnode, "baud")))
return true;
/* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
return false;
INIT_LIST_HEAD(&resource_list);