diff options
author | Hans de Goede <hdegoede@redhat.com> | 2021-12-30 12:57:47 +0100 |
---|---|---|
committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2021-12-30 17:34:27 +0100 |
commit | f85196bdd5a50da74670250564740fc852b3c239 (patch) | |
tree | c01b6fab74809039c742efea72b43a359a4442c0 /drivers | |
parent | 99ece713773bfa17fdb4ee2a1fb3b7bee82e4b1a (diff) | |
download | linux-f85196bdd5a50da74670250564740fc852b3c239.tar.bz2 |
ACPI: scan: Create platform device for BCM4752 and LNV4752 ACPI nodes
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: e361d1f85855 ("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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/acpi/scan.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index a9adcda39d40..4dd3a9efcd0f 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1710,6 +1710,7 @@ 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. @@ -1718,11 +1719,18 @@ 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", }, {} }; @@ -1736,8 +1744,7 @@ 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); |