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-rw-r--r--drivers/platform/chrome/Kconfig11
-rw-r--r--drivers/platform/chrome/Makefile1
-rw-r--r--drivers/platform/chrome/chromeos_privacy_screen.c153
-rw-r--r--drivers/platform/chrome/cros_ec.c4
-rw-r--r--drivers/platform/chrome/cros_ec.h2
-rw-r--r--drivers/platform/chrome/cros_ec_i2c.c4
-rw-r--r--drivers/platform/chrome/cros_ec_lpc.c4
-rw-r--r--drivers/platform/chrome/cros_ec_spi.c4
-rw-r--r--drivers/platform/olpc/olpc-xo175-ec.c4
-rw-r--r--drivers/platform/x86/thinkpad_acpi.c2
10 files changed, 177 insertions, 12 deletions
diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index ccc23d8686e8..75e93efd669f 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -243,6 +243,17 @@ config CROS_USBPD_NOTIFY
To compile this driver as a module, choose M here: the
module will be called cros_usbpd_notify.
+config CHROMEOS_PRIVACY_SCREEN
+ tristate "ChromeOS Privacy Screen support"
+ depends on ACPI
+ depends on DRM
+ select DRM_PRIVACY_SCREEN
+ help
+ This driver provides the support needed for the in-built electronic
+ privacy screen that is present on some ChromeOS devices. When enabled,
+ this should probably always be built into the kernel to avoid or
+ minimize drm probe deferral.
+
source "drivers/platform/chrome/wilco_ec/Kconfig"
endif # CHROMEOS_PLATFORMS
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index f901d2e43166..5d4be9735d9d 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -4,6 +4,7 @@
CFLAGS_cros_ec_trace.o:= -I$(src)
obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o
+obj-$(CONFIG_CHROMEOS_PRIVACY_SCREEN) += chromeos_privacy_screen.o
obj-$(CONFIG_CHROMEOS_PSTORE) += chromeos_pstore.o
obj-$(CONFIG_CHROMEOS_TBMC) += chromeos_tbmc.o
obj-$(CONFIG_CROS_EC) += cros_ec.o
diff --git a/drivers/platform/chrome/chromeos_privacy_screen.c b/drivers/platform/chrome/chromeos_privacy_screen.c
new file mode 100644
index 000000000000..77e9f5ee8e33
--- /dev/null
+++ b/drivers/platform/chrome/chromeos_privacy_screen.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * ChromeOS Privacy Screen support
+ *
+ * Copyright (C) 2022 Google LLC
+ *
+ * This is the Chromeos privacy screen provider, present on certain chromebooks,
+ * represented by a GOOG0010 device in the ACPI. This ACPI device, if present,
+ * will cause the i915 drm driver to probe defer until this driver registers
+ * the privacy-screen.
+ */
+
+#include <linux/acpi.h>
+#include <drm/drm_privacy_screen_driver.h>
+
+/*
+ * The DSM (Device Specific Method) constants below are the agreed API with
+ * the firmware team, on how to control privacy screen using ACPI methods.
+ */
+#define PRIV_SCRN_DSM_REVID 1 /* DSM version */
+#define PRIV_SCRN_DSM_FN_GET_STATUS 1 /* Get privacy screen status */
+#define PRIV_SCRN_DSM_FN_ENABLE 2 /* Enable privacy screen */
+#define PRIV_SCRN_DSM_FN_DISABLE 3 /* Disable privacy screen */
+
+static const guid_t chromeos_privacy_screen_dsm_guid =
+ GUID_INIT(0xc7033113, 0x8720, 0x4ceb,
+ 0x90, 0x90, 0x9d, 0x52, 0xb3, 0xe5, 0x2d, 0x73);
+
+static void
+chromeos_privacy_screen_get_hw_state(struct drm_privacy_screen
+ *drm_privacy_screen)
+{
+ union acpi_object *obj;
+ acpi_handle handle;
+ struct device *privacy_screen =
+ drm_privacy_screen_get_drvdata(drm_privacy_screen);
+
+ handle = acpi_device_handle(to_acpi_device(privacy_screen));
+ obj = acpi_evaluate_dsm(handle, &chromeos_privacy_screen_dsm_guid,
+ PRIV_SCRN_DSM_REVID,
+ PRIV_SCRN_DSM_FN_GET_STATUS, NULL);
+ if (!obj) {
+ dev_err(privacy_screen,
+ "_DSM failed to get privacy-screen state\n");
+ return;
+ }
+
+ if (obj->type != ACPI_TYPE_INTEGER)
+ dev_err(privacy_screen,
+ "Bad _DSM to get privacy-screen state\n");
+ else if (obj->integer.value == 1)
+ drm_privacy_screen->hw_state = drm_privacy_screen->sw_state =
+ PRIVACY_SCREEN_ENABLED;
+ else
+ drm_privacy_screen->hw_state = drm_privacy_screen->sw_state =
+ PRIVACY_SCREEN_DISABLED;
+
+ ACPI_FREE(obj);
+}
+
+static int
+chromeos_privacy_screen_set_sw_state(struct drm_privacy_screen
+ *drm_privacy_screen,
+ enum drm_privacy_screen_status state)
+{
+ union acpi_object *obj = NULL;
+ acpi_handle handle;
+ struct device *privacy_screen =
+ drm_privacy_screen_get_drvdata(drm_privacy_screen);
+
+ handle = acpi_device_handle(to_acpi_device(privacy_screen));
+
+ if (state == PRIVACY_SCREEN_DISABLED) {
+ obj = acpi_evaluate_dsm(handle,
+ &chromeos_privacy_screen_dsm_guid,
+ PRIV_SCRN_DSM_REVID,
+ PRIV_SCRN_DSM_FN_DISABLE, NULL);
+ } else if (state == PRIVACY_SCREEN_ENABLED) {
+ obj = acpi_evaluate_dsm(handle,
+ &chromeos_privacy_screen_dsm_guid,
+ PRIV_SCRN_DSM_REVID,
+ PRIV_SCRN_DSM_FN_ENABLE, NULL);
+ } else {
+ dev_err(privacy_screen,
+ "Bad attempt to set privacy-screen status to %u\n",
+ state);
+ return -EINVAL;
+ }
+
+ if (!obj) {
+ dev_err(privacy_screen,
+ "_DSM failed to set privacy-screen state\n");
+ return -EIO;
+ }
+
+ drm_privacy_screen->hw_state = drm_privacy_screen->sw_state = state;
+ ACPI_FREE(obj);
+ return 0;
+}
+
+static const struct drm_privacy_screen_ops chromeos_privacy_screen_ops = {
+ .get_hw_state = chromeos_privacy_screen_get_hw_state,
+ .set_sw_state = chromeos_privacy_screen_set_sw_state,
+};
+
+static int chromeos_privacy_screen_add(struct acpi_device *adev)
+{
+ struct drm_privacy_screen *drm_privacy_screen =
+ drm_privacy_screen_register(&adev->dev,
+ &chromeos_privacy_screen_ops,
+ &adev->dev);
+
+ if (IS_ERR(drm_privacy_screen)) {
+ dev_err(&adev->dev, "Error registering privacy-screen\n");
+ return PTR_ERR(drm_privacy_screen);
+ }
+
+ adev->driver_data = drm_privacy_screen;
+ dev_info(&adev->dev, "registered privacy-screen '%s'\n",
+ dev_name(&drm_privacy_screen->dev));
+
+ return 0;
+}
+
+static int chromeos_privacy_screen_remove(struct acpi_device *adev)
+{
+ struct drm_privacy_screen *drm_privacy_screen = acpi_driver_data(adev);
+
+ drm_privacy_screen_unregister(drm_privacy_screen);
+ return 0;
+}
+
+static const struct acpi_device_id chromeos_privacy_screen_device_ids[] = {
+ {"GOOG0010", 0}, /* Google's electronic privacy screen for eDP-1 */
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, chromeos_privacy_screen_device_ids);
+
+static struct acpi_driver chromeos_privacy_screen_driver = {
+ .name = "chromeos_privacy_screen_driver",
+ .class = "ChromeOS",
+ .ids = chromeos_privacy_screen_device_ids,
+ .ops = {
+ .add = chromeos_privacy_screen_add,
+ .remove = chromeos_privacy_screen_remove,
+ },
+};
+
+module_acpi_driver(chromeos_privacy_screen_driver);
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("ChromeOS ACPI Privacy Screen driver");
+MODULE_AUTHOR("Rajat Jain <rajatja@google.com>");
diff --git a/drivers/platform/chrome/cros_ec.c b/drivers/platform/chrome/cros_ec.c
index fc5aa1525d13..d49a4efe46c8 100644
--- a/drivers/platform/chrome/cros_ec.c
+++ b/drivers/platform/chrome/cros_ec.c
@@ -302,13 +302,11 @@ EXPORT_SYMBOL(cros_ec_register);
*
* Return: 0 on success or negative error code.
*/
-int cros_ec_unregister(struct cros_ec_device *ec_dev)
+void cros_ec_unregister(struct cros_ec_device *ec_dev)
{
if (ec_dev->pd)
platform_device_unregister(ec_dev->pd);
platform_device_unregister(ec_dev->ec);
-
- return 0;
}
EXPORT_SYMBOL(cros_ec_unregister);
diff --git a/drivers/platform/chrome/cros_ec.h b/drivers/platform/chrome/cros_ec.h
index 78363dcfdf23..bbca0096868a 100644
--- a/drivers/platform/chrome/cros_ec.h
+++ b/drivers/platform/chrome/cros_ec.h
@@ -11,7 +11,7 @@
#include <linux/interrupt.h>
int cros_ec_register(struct cros_ec_device *ec_dev);
-int cros_ec_unregister(struct cros_ec_device *ec_dev);
+void cros_ec_unregister(struct cros_ec_device *ec_dev);
int cros_ec_suspend(struct cros_ec_device *ec_dev);
int cros_ec_resume(struct cros_ec_device *ec_dev);
diff --git a/drivers/platform/chrome/cros_ec_i2c.c b/drivers/platform/chrome/cros_ec_i2c.c
index 30c8938c27d5..22feb0fd4ce7 100644
--- a/drivers/platform/chrome/cros_ec_i2c.c
+++ b/drivers/platform/chrome/cros_ec_i2c.c
@@ -313,7 +313,9 @@ static int cros_ec_i2c_remove(struct i2c_client *client)
{
struct cros_ec_device *ec_dev = i2c_get_clientdata(client);
- return cros_ec_unregister(ec_dev);
+ cros_ec_unregister(ec_dev);
+
+ return 0;
}
#ifdef CONFIG_PM_SLEEP
diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index d6306d2a096f..7651417b4a25 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -439,7 +439,9 @@ static int cros_ec_lpc_remove(struct platform_device *pdev)
acpi_remove_notify_handler(adev->handle, ACPI_ALL_NOTIFY,
cros_ec_lpc_acpi_notify);
- return cros_ec_unregister(ec_dev);
+ cros_ec_unregister(ec_dev);
+
+ return 0;
}
static const struct acpi_device_id cros_ec_lpc_acpi_device_ids[] = {
diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c
index 14c4046fa04d..8493af0f680e 100644
--- a/drivers/platform/chrome/cros_ec_spi.c
+++ b/drivers/platform/chrome/cros_ec_spi.c
@@ -786,11 +786,11 @@ static int cros_ec_spi_probe(struct spi_device *spi)
return 0;
}
-static int cros_ec_spi_remove(struct spi_device *spi)
+static void cros_ec_spi_remove(struct spi_device *spi)
{
struct cros_ec_device *ec_dev = spi_get_drvdata(spi);
- return cros_ec_unregister(ec_dev);
+ cros_ec_unregister(ec_dev);
}
#ifdef CONFIG_PM_SLEEP
diff --git a/drivers/platform/olpc/olpc-xo175-ec.c b/drivers/platform/olpc/olpc-xo175-ec.c
index 0d46706afd2d..4823bd2819f6 100644
--- a/drivers/platform/olpc/olpc-xo175-ec.c
+++ b/drivers/platform/olpc/olpc-xo175-ec.c
@@ -648,7 +648,7 @@ static struct olpc_ec_driver olpc_xo175_ec_driver = {
.ec_cmd = olpc_xo175_ec_cmd,
};
-static int olpc_xo175_ec_remove(struct spi_device *spi)
+static void olpc_xo175_ec_remove(struct spi_device *spi)
{
if (pm_power_off == olpc_xo175_ec_power_off)
pm_power_off = NULL;
@@ -657,8 +657,6 @@ static int olpc_xo175_ec_remove(struct spi_device *spi)
platform_device_unregister(olpc_ec);
olpc_ec = NULL;
-
- return 0;
}
static int olpc_xo175_ec_probe(struct spi_device *spi)
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 515a592c9f02..c568fae56db2 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -9885,7 +9885,7 @@ static int tpacpi_lcdshadow_init(struct ibm_init_struct *iibm)
return 0;
lcdshadow_dev = drm_privacy_screen_register(&tpacpi_pdev->dev,
- &lcdshadow_ops);
+ &lcdshadow_ops, NULL);
if (IS_ERR(lcdshadow_dev))
return PTR_ERR(lcdshadow_dev);
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-30 21:14:09 +0000