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acpi_ibm: add support for ThinkPad PrivacyGuard

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ThinkPad PrivacyGuard is a built-in toggleable privacy filter that
restricts viewing angles when on. It is an available on some new
ThinkPad models such as the X1 Carbon 7th gen (as an optional HW
upgrade).

The privacy filter can be enabled/disabled via an ACPI call. This commit
adds a sysctl under dev.acpi_ibm that allows for getting and setting the
PrivacyGuard state.

Submitted by:   Kamila Součková <kamila@ksp.sk>
Reviewed By:    cem, philip
MFC after:      3  days
Differential Revision: https://reviews.freebsd.org/D23370
This commit is contained in:
Philip Paeps 2020-01-30 10:40:38 +00:00
parent b65f813c1a
commit 02aeba8374
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=357292
1 changed files with 97 additions and 0 deletions
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97
sys/dev/acpi_support/acpi_ibm.c
View file

@ -75,6 +75,7 @@ ACPI_MODULE_NAME("IBM")
#define ACPI_IBM_METHOD_THERMAL 13
#define ACPI_IBM_METHOD_HANDLEREVENTS 14
#define ACPI_IBM_METHOD_MIC_LED 15
#define ACPI_IBM_METHOD_PRIVACYGUARD 16
/* Hotkeys/Buttons */
#define IBM_RTC_HOTKEY1 0x64
@ -123,6 +124,8 @@ ACPI_MODULE_NAME("IBM")
#define IBM_NAME_MASK_WLAN (1 << 2)
#define IBM_NAME_THERMAL_GET "TMP7"
#define IBM_NAME_THERMAL_UPDT "UPDT"
#define IBM_NAME_PRIVACYGUARD_GET "GSSS"
#define IBM_NAME_PRIVACYGUARD_SET "SSSS"
#define IBM_NAME_EVENTS_STATUS_GET "DHKC"
#define IBM_NAME_EVENTS_MASK_GET "DHKN"
@ -146,6 +149,10 @@ ACPI_MODULE_NAME("IBM")
#define IBM_EVENT_MUTE 0x17
#define IBM_EVENT_ACCESS_IBM_BUTTON 0x18
/* Device-specific register flags */
#define IBM_FLAG_PRIVACYGUARD_DEVICE_PRESENT 0x10000
#define IBM_FLAG_PRIVACYGUARD_ON 0x1
#define ABS(x) (((x) < 0)? -(x) : (x))
struct acpi_ibm_softc {
@ -268,6 +275,11 @@ static struct {
.method = ACPI_IBM_METHOD_MIC_LED,
.description = "Mic led",
},
{
.name = "privacyguard",
.method = ACPI_IBM_METHOD_PRIVACYGUARD,
.description = "PrivacyGuard enable",
},
{ NULL, 0, NULL, 0 }
};
@ -327,6 +339,11 @@ static int acpi_ibm_bluetooth_set(struct acpi_ibm_softc *sc, int arg);
static int acpi_ibm_thinklight_set(struct acpi_ibm_softc *sc, int arg);
static int acpi_ibm_volume_set(struct acpi_ibm_softc *sc, int arg);
static int acpi_ibm_mute_set(struct acpi_ibm_softc *sc, int arg);
static int acpi_ibm_privacyguard_get(struct acpi_ibm_softc *sc);
static ACPI_STATUS acpi_ibm_privacyguard_set(struct acpi_ibm_softc *sc, int arg);
static ACPI_STATUS acpi_ibm_privacyguard_acpi_call(struct acpi_ibm_softc *sc, bool write, int *arg);
static int acpi_status_to_errno(ACPI_STATUS status);
static device_method_t acpi_ibm_methods[] = {
/* Device interface */
@ -351,6 +368,19 @@ DRIVER_MODULE(acpi_ibm, acpi, acpi_ibm_driver, acpi_ibm_devclass,
MODULE_DEPEND(acpi_ibm, acpi, 1, 1, 1);
static char *ibm_ids[] = {"IBM0068", "LEN0068", "LEN0268", NULL};
static int
acpi_status_to_errno(ACPI_STATUS status)
{
switch (status) {
case AE_OK:
return (0);
case AE_BAD_PARAMETER:
return (EINVAL);
default:
return (ENODEV);
}
}
static void
ibm_led(void *softc, int onoff)
{
@ -821,6 +851,11 @@ acpi_ibm_sysctl_get(struct acpi_ibm_softc *sc, int method)
else
val = -1;
break;
case ACPI_IBM_METHOD_PRIVACYGUARD:
val = acpi_ibm_privacyguard_get(sc);
break;
}
return (val);
@ -877,6 +912,10 @@ acpi_ibm_sysctl_set(struct acpi_ibm_softc *sc, int method, int arg)
return acpi_ibm_bluetooth_set(sc, arg);
break;
case ACPI_IBM_METHOD_PRIVACYGUARD:
return (acpi_status_to_errno(acpi_ibm_privacyguard_set(sc, arg)));
break;
case ACPI_IBM_METHOD_FANLEVEL:
if (arg < 0 || arg > 7)
return (EINVAL);
@ -1008,6 +1047,10 @@ acpi_ibm_sysctl_init(struct acpi_ibm_softc *sc, int method)
case ACPI_IBM_METHOD_HANDLEREVENTS:
return (TRUE);
case ACPI_IBM_METHOD_PRIVACYGUARD:
return (acpi_ibm_privacyguard_get(sc) != -1);
}
return (FALSE);
}
@ -1225,6 +1268,60 @@ acpi_ibm_thinklight_set(struct acpi_ibm_softc *sc, int arg)
return (0);
}
/*
* Helper function to make a get or set ACPI call to the PrivacyGuard handle.
* Only meant to be used internally by the get/set functions below.
*/
static ACPI_STATUS
acpi_ibm_privacyguard_acpi_call(struct acpi_ibm_softc *sc, bool write, int *arg) {
ACPI_OBJECT Arg;
ACPI_OBJECT_LIST Args;
ACPI_STATUS status;
ACPI_OBJECT out_obj;
ACPI_BUFFER result;
Arg.Type = ACPI_TYPE_INTEGER;
Arg.Integer.Value = (write ? *arg : 0);
Args.Count = 1;
Args.Pointer = &Arg;
result.Length = sizeof(out_obj);
result.Pointer = &out_obj;
status = AcpiEvaluateObject(sc->handle,
(write ? IBM_NAME_PRIVACYGUARD_SET : IBM_NAME_PRIVACYGUARD_GET),
&Args, &result);
if (ACPI_SUCCESS(status) && !write)
*arg = out_obj.Integer.Value;
return (status);
}
/*
* Returns -1 if the device is not present.
*/
static int
acpi_ibm_privacyguard_get(struct acpi_ibm_softc *sc)
{
ACPI_STATUS status;
int val;
status = acpi_ibm_privacyguard_acpi_call(sc, false, &val);
if (ACPI_SUCCESS(status) &&
(val & IBM_FLAG_PRIVACYGUARD_DEVICE_PRESENT))
return (val & IBM_FLAG_PRIVACYGUARD_ON);
return (-1);
}
static ACPI_STATUS
acpi_ibm_privacyguard_set(struct acpi_ibm_softc *sc, int arg)
{
if (arg < 0 || arg > 1)
return (AE_BAD_PARAMETER);
return (acpi_ibm_privacyguard_acpi_call(sc, true, &arg));
}
static int
acpi_ibm_volume_set(struct acpi_ibm_softc *sc, int arg)
{