Register a privacy-screen device on laptops with a privacy-screen,
this exports the PrivacyGuard features to user-space using a
standardized vendor-agnostic sysfs interface. Note the sysfs interface
is read-only.
Registering a privacy-screen device with the new privacy-screen class
code will also allow the GPU driver to get a handle to it and export
the privacy-screen setting as a property on the DRM connector object
for the LCD panel. This DRM connector property is news standardized
interface which all user-space code should use to query and control
the privacy-screen.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/platform/x86/Kconfig | 1 +
drivers/platform/x86/thinkpad_acpi.c | 76 +++++++++++++++++++---------
2 files changed, 52 insertions(+), 25 deletions(-)
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 318e083f38b3..db427ab86292 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -617,6 +617,7 @@ config THINKPAD_ACPI
depends on RFKILL || RFKILL = n
depends on ACPI_VIDEO || ACPI_VIDEO = n
depends on BACKLIGHT_CLASS_DEVICE
+ select DRM_PRIVACY_SCREEN
select HWMON
select NVRAM
select NEW_LEDS
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 782e74d3167f..7e7edac26f83 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -72,6 +72,7 @@
#include <linux/uaccess.h>
#include <acpi/battery.h>
#include <acpi/video.h>
+#include <drm/drm_privacy_screen_driver.h>
/* ThinkPad CMOS commands */
#define TP_CMOS_VOLUME_DOWN 0
@@ -9699,30 +9700,40 @@ static struct ibm_struct battery_driver_data = {
* LCD Shadow subdriver, for the Lenovo PrivacyGuard feature
*/
+static struct drm_privacy_screen *lcdshadow_dev;
static acpi_handle lcdshadow_get_handle;
static acpi_handle lcdshadow_set_handle;
-static int lcdshadow_state;
-static int lcdshadow_on_off(bool state)
+int lcdshadow_set_sw_state(struct drm_privacy_screen *priv,
+ enum drm_privacy_screen_status state)
{
int output;
+ if (WARN_ON(!mutex_is_locked(&priv->lock)))
+ return -EIO;
+
if (!acpi_evalf(lcdshadow_set_handle, &output, NULL, "dd", (int)state))
return -EIO;
- lcdshadow_state = state;
+ priv->hw_state = priv->sw_state = state;
return 0;
}
-static int lcdshadow_set(bool on)
+void lcdshadow_get_hw_state(struct drm_privacy_screen *priv)
{
- if (lcdshadow_state < 0)
- return lcdshadow_state;
- if (lcdshadow_state == on)
- return 0;
- return lcdshadow_on_off(on);
+ int output;
+
+ if (!acpi_evalf(lcdshadow_get_handle, &output, NULL, "dd", 0))
+ return;
+
+ priv->hw_state = priv->sw_state = output & 0x1;
}
+const struct drm_privacy_screen_ops lcdshadow_ops = {
+ .set_sw_state = lcdshadow_set_sw_state,
+ .get_hw_state = lcdshadow_get_hw_state,
+};
+
static int tpacpi_lcdshadow_init(struct ibm_init_struct *iibm)
{
acpi_status status1, status2;
@@ -9730,36 +9741,44 @@ static int tpacpi_lcdshadow_init(struct ibm_init_struct *iibm)
status1 = acpi_get_handle(hkey_handle, "GSSS", &lcdshadow_get_handle);
status2 = acpi_get_handle(hkey_handle, "SSSS", &lcdshadow_set_handle);
- if (ACPI_FAILURE(status1) || ACPI_FAILURE(status2)) {
- lcdshadow_state = -ENODEV;
+ if (ACPI_FAILURE(status1) || ACPI_FAILURE(status2))
return 0;
- }
- if (!acpi_evalf(lcdshadow_get_handle, &output, NULL, "dd", 0)) {
- lcdshadow_state = -EIO;
+ if (!acpi_evalf(lcdshadow_get_handle, &output, NULL, "dd", 0))
return -EIO;
- }
- if (!(output & 0x10000)) {
- lcdshadow_state = -ENODEV;
+
+ if (!(output & 0x10000))
return 0;
- }
- lcdshadow_state = output & 0x1;
+
+ lcdshadow_dev = drm_privacy_screen_register(&tpacpi_pdev->dev,
+ &lcdshadow_ops);
+ if (IS_ERR(lcdshadow_dev))
+ return PTR_ERR(lcdshadow_dev);
return 0;
}
+static void lcdshadow_exit(void)
+{
+ drm_privacy_screen_unregister(lcdshadow_dev);
+}
+
static void lcdshadow_resume(void)
{
- if (lcdshadow_state >= 0)
- lcdshadow_on_off(lcdshadow_state);
+ if (!lcdshadow_dev)
+ return;
+
+ mutex_lock(&lcdshadow_dev->lock);
+ lcdshadow_set_sw_state(lcdshadow_dev, lcdshadow_dev->sw_state);
+ mutex_unlock(&lcdshadow_dev->lock);
}
static int lcdshadow_read(struct seq_file *m)
{
- if (lcdshadow_state < 0) {
+ if (!lcdshadow_dev) {
seq_puts(m, "status:\t\tnot supported\n");
} else {
- seq_printf(m, "status:\t\t%d\n", lcdshadow_state);
+ seq_printf(m, "status:\t\t%d\n", lcdshadow_dev->hw_state);
seq_puts(m, "commands:\t0, 1\n");
}
@@ -9771,7 +9790,7 @@ static int lcdshadow_write(char *buf)
char *cmd;
int res, state = -EINVAL;
- if (lcdshadow_state < 0)
+ if (!lcdshadow_dev)
return -ENODEV;
while ((cmd = strsep(&buf, ","))) {
@@ -9783,11 +9802,18 @@ static int lcdshadow_write(char *buf)
if (state >= 2 || state < 0)
return -EINVAL;
- return lcdshadow_set(state);
+ mutex_lock(&lcdshadow_dev->lock);
+ res = lcdshadow_set_sw_state(lcdshadow_dev, state);
+ mutex_unlock(&lcdshadow_dev->lock);
+
+ drm_privacy_screen_call_notifier_chain(lcdshadow_dev);
+
+ return res;
}
static struct ibm_struct lcdshadow_driver_data = {
.name = "lcdshadow",
+ .exit = lcdshadow_exit,
.resume = lcdshadow_resume,
.read = lcdshadow_read,
.write = lcdshadow_write,
--
2.26.2
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