This patch series adds a new driver for a WMI interface found in many newer Dell machines. This interface allows to read battery properties like temperature and the ePPID (Dell-specific), while also providing fan and thermal sensor information. The interface does support multiple batteries which are indetified by an "index", which appears to be the batteries ACPI UID. Since the interface also appears to omit any bounts checking of the index, the ACPI battery hook mechanism is used to discover batteries. Since the information returned when querying fan/thermal sensor information is currently unknown, a debugfs entry is created to allow for easier reverse engineering. The interface is likely to be replaced by a proper hwmon interface in the future. Since the driver can potentially be instantiated mutplie times, the ACPI battery hook mechanism had to be extended. The first two patches allow that battery hooks are not unloaded if they return an error when a battery was added, so that they can safely return -ENODEV. The next two patches extend the battery hook mechanism to better support drivers which can be instantiated mupltible times. The last patch finally adds the new driver. It was called dell-wmi-ddv since the interface is called "DDV" by Dell software, likely meaning "Dell Data Vault". The driver was tested, together with the changes made to the ACPI battery driver, on a Dell Inspiron 3505. Other drivers already using the battery hook mechanism where changed as well, but could only be compile-tested due to missing hardware. Armin Wolf (5): ACPI: battery: Do not unload battery hooks on single error ACPI: battery: Simplify battery_hook_unregister() ACPI: battery: Allow battery hooks to be registered multiple times. ACPI: battery: Allow for passing data to battery hooks. platform/x86: dell: Add new dell-wmi-ddv driver .../ABI/testing/debugfs-dell-wmi-ddv | 21 + .../ABI/testing/sysfs-platform-dell-wmi-ddv | 16 + MAINTAINERS | 7 + drivers/acpi/battery.c | 59 ++- drivers/platform/x86/asus-wmi.c | 20 +- drivers/platform/x86/dell/Kconfig | 13 + drivers/platform/x86/dell/Makefile | 1 + drivers/platform/x86/dell/dell-wmi-ddv.c | 365 ++++++++++++++++++ drivers/platform/x86/huawei-wmi.c | 15 +- drivers/platform/x86/lg-laptop.c | 14 +- drivers/platform/x86/system76_acpi.c | 22 +- drivers/platform/x86/thinkpad_acpi.c | 15 +- drivers/platform/x86/wmi.c | 1 + include/acpi/battery.h | 12 +- 14 files changed, 504 insertions(+), 77 deletions(-) create mode 100644 Documentation/ABI/testing/debugfs-dell-wmi-ddv create mode 100644 Documentation/ABI/testing/sysfs-platform-dell-wmi-ddv create mode 100644 drivers/platform/x86/dell/dell-wmi-ddv.c -- 2.30.2
