Add X86 specific arch init code, which fills the privacy-screen lookup
table by checking for various vendor specific ACPI interfaces for
controlling the privacy-screen.
This initial version only checks for the Lenovo Thinkpad specific ACPI
methods for privacy-screen control.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/gpu/drm/Makefile | 5 +-
drivers/gpu/drm/drm_privacy_screen_x86.c | 82 ++++++++++++++++++++++++
include/drm/drm_privacy_screen_machine.h | 5 ++
3 files changed, 91 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/drm_privacy_screen_x86.c
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 9a802605249d..75166bd53e00 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -58,11 +58,14 @@ drm_kms_helper-$(CONFIG_DRM_DP_CEC) += drm_dp_cec.o
obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o
obj-$(CONFIG_DRM_DEBUG_SELFTEST) += selftests/
+drm_privacy_screen_helper-y := drm_privacy_screen.o
+drm_privacy_screen_helper-$(CONFIG_X86) += drm_privacy_screen_x86.o
+obj-$(CONFIG_DRM_PRIVACY_SCREEN) += drm_privacy_screen_helper.o
+
obj-$(CONFIG_DRM) += drm.o
obj-$(CONFIG_DRM_MIPI_DBI) += drm_mipi_dbi.o
obj-$(CONFIG_DRM_MIPI_DSI) += drm_mipi_dsi.o
obj-$(CONFIG_DRM_PANEL_ORIENTATION_QUIRKS) += drm_panel_orientation_quirks.o
-obj-$(CONFIG_DRM_PRIVACY_SCREEN) += drm_privacy_screen.o
obj-y += arm/
obj-$(CONFIG_DRM_TTM) += ttm/
obj-$(CONFIG_DRM_SCHED) += scheduler/
diff --git a/drivers/gpu/drm/drm_privacy_screen_x86.c b/drivers/gpu/drm/drm_privacy_screen_x86.c
new file mode 100644
index 000000000000..f486d9087819
--- /dev/null
+++ b/drivers/gpu/drm/drm_privacy_screen_x86.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright (C) 2020 Red Hat, Inc.
+ *
+ * Authors:
+ * Hans de Goede <hdegoede@xxxxxxxxxx>
+ */
+
+#include <linux/acpi.h>
+#include <drm/drm_privacy_screen_machine.h>
+
+static struct drm_privacy_screen_lookup arch_lookup;
+
+struct arch_init_data {
+ struct drm_privacy_screen_lookup lookup;
+ bool (*detect)(void);
+};
+
+static acpi_status __init acpi_set_handle(acpi_handle handle, u32 level,
+ void *context, void **return_value)
+{
+ *(acpi_handle *)return_value = handle;
+ return AE_CTRL_TERMINATE;
+}
+
+static bool __init detect_thinkpad_privacy_screen(void)
+{
+ union acpi_object obj = { .type = ACPI_TYPE_INTEGER };
+ struct acpi_object_list args = { .count = 1, .pointer = &obj, };
+ acpi_handle ec_handle = NULL;
+ unsigned long long output;
+ acpi_status status;
+
+ /* Get embedded-controller handle */
+ status = acpi_get_devices("PNP0C09", acpi_set_handle, NULL, &ec_handle);
+ if (ACPI_FAILURE(status) || !ec_handle)
+ return false;
+
+ /* And call the privacy-screen get-status method */
+ status = acpi_evaluate_integer(ec_handle, "HKEY.GSSS", &args, &output);
+ if (ACPI_FAILURE(status))
+ return false;
+
+ return (output & 0x10000) ? true : false;
+}
+
+static const struct arch_init_data arch_init_data[] __initconst = {
+#if IS_ENABLED(CONFIG_THINKPAD_ACPI)
+ {
+ .lookup = {
+ .dev_id = NULL,
+ .con_id = NULL,
+ .provider = "thinkpad_acpi",
+ },
+ .detect = detect_thinkpad_privacy_screen,
+ },
+#endif
+};
+
+void __init drm_privacy_screen_arch_init(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(arch_init_data); i++) {
+ if (!arch_init_data[i].detect())
+ continue;
+
+ pr_info("Found '%s' privacy-screen provider\n",
+ arch_init_data[i].lookup.provider);
+
+ /* Make a copy because arch_init_data is __initconst */
+ arch_lookup = arch_init_data[i].lookup;
+ drm_privacy_screen_lookup_add(&arch_lookup);
+ break;
+ }
+}
+
+void __exit drm_privacy_screen_arch_exit(void)
+{
+ if (arch_lookup.provider)
+ drm_privacy_screen_lookup_remove(&arch_lookup);
+}
diff --git a/include/drm/drm_privacy_screen_machine.h b/include/drm/drm_privacy_screen_machine.h
index 55f4b4fd8e4e..0d2f2a443e8c 100644
--- a/include/drm/drm_privacy_screen_machine.h
+++ b/include/drm/drm_privacy_screen_machine.h
@@ -31,11 +31,16 @@ struct drm_privacy_screen_lookup {
void drm_privacy_screen_lookup_add(struct drm_privacy_screen_lookup *lookup);
void drm_privacy_screen_lookup_remove(struct drm_privacy_screen_lookup *lookup);
+#ifdef CONFIG_X86
+void drm_privacy_screen_arch_init(void);
+void drm_privacy_screen_arch_exit(void);
+#else
static inline void drm_privacy_screen_arch_init(void)
{
}
static inline void drm_privacy_screen_arch_exit(void)
{
}
+#endif
#endif
--
2.31.1
