platform/x86: thinkpad_acpi: Add ThinkPad PrivacyGuard

This feature is found optionally in T480s, T490, T490s.

The feature is called lcdshadow and visible via
/proc/acpi/ibm/lcdshadow.

The ACPI methods \_SB.PCI0.LPCB.EC.HKEY.{GSSS,SSSS,TSSS,CSSS} are
available in these machines. They get, set, toggle or change the state
apparently.

The patch was tested on a 5.0 series kernel on a T480s.

Signed-off-by: Alexander Schremmer <alex@alexanderweb.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

1 files changed, 105 insertions, 0 deletions

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index d379bdf98a0f..da794dcfdd92 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -9711,6 +9711,107 @@ static struct ibm_struct battery_driver_data = {
 	.exit = tpacpi_battery_exit,
 };
 
+/*************************************************************************
+ * LCD Shadow subdriver, for the Lenovo PrivacyGuard feature
+ */
+
+static int lcdshadow_state;
+
+static int lcdshadow_on_off(bool state)
+{
+	acpi_handle set_shadow_handle;
+	int output;
+
+	if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "SSSS", &set_shadow_handle))) {
+		pr_warn("Thinkpad ACPI has no %s interface.\n", "SSSS");
+		return -EIO;
+	}
+
+	if (!acpi_evalf(set_shadow_handle, &output, NULL, "dd", (int)state))
+		return -EIO;
+
+	lcdshadow_state = state;
+	return 0;
+}
+
+static int lcdshadow_set(bool on)
+{
+	if (lcdshadow_state < 0)
+		return lcdshadow_state;
+	if (lcdshadow_state == on)
+		return 0;
+	return lcdshadow_on_off(on);
+}
+
+static int tpacpi_lcdshadow_init(struct ibm_init_struct *iibm)
+{
+	acpi_handle get_shadow_handle;
+	int output;
+
+	if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "GSSS", &get_shadow_handle))) {
+		lcdshadow_state = -ENODEV;
+		return 0;
+	}
+
+	if (!acpi_evalf(get_shadow_handle, &output, NULL, "dd", 0)) {
+		lcdshadow_state = -EIO;
+		return -EIO;
+	}
+	if (!(output & 0x10000)) {
+		lcdshadow_state = -ENODEV;
+		return 0;
+	}
+	lcdshadow_state = output & 0x1;
+
+	return 0;
+}
+
+static void lcdshadow_resume(void)
+{
+	if (lcdshadow_state >= 0)
+		lcdshadow_on_off(lcdshadow_state);
+}
+
+static int lcdshadow_read(struct seq_file *m)
+{
+	if (lcdshadow_state < 0) {
+		seq_puts(m, "status:\t\tnot supported\n");
+	} else {
+		seq_printf(m, "status:\t\t%d\n", lcdshadow_state);
+		seq_puts(m, "commands:\t0, 1\n");
+	}
+
+	return 0;
+}
+
+static int lcdshadow_write(char *buf)
+{
+	char *cmd;
+	int state = -1;
+
+	if (lcdshadow_state < 0)
+		return -ENODEV;
+
+	while ((cmd = next_cmd(&buf))) {
+		if (strlencmp(cmd, "0") == 0)
+			state = 0;
+		else if (strlencmp(cmd, "1") == 0)
+			state = 1;
+	}
+
+	if (state == -1)
+		return -EINVAL;
+
+	return lcdshadow_set(state);
+}
+
+static struct ibm_struct lcdshadow_driver_data = {
+	.name = "lcdshadow",
+	.resume = lcdshadow_resume,
+	.read = lcdshadow_read,
+	.write = lcdshadow_write,
+};
+
 /****************************************************************************
  ****************************************************************************
  *
@@ -10192,6 +10293,10 @@ static struct ibm_init_struct ibms_init[] __initdata = {
 		.init = tpacpi_battery_init,
 		.data = &battery_driver_data,
 	},
+	{
+		.init = tpacpi_lcdshadow_init,
+		.data = &lcdshadow_driver_data,
+	},
 };
 
 static int __init set_ibm_param(const char *val, const struct kernel_param *kp)