@@ -51,6 +51,7 @@ detailed description):
- UWB enable and disable
- LCD Shadow (PrivacyGuard) enable and disable
- Lap mode sensor
+ - Palm sensor (aka psensor)
A compatibility table by model and feature is maintained on the web
site, http://ibm-acpi.sf.net/. I appreciate any success or failure
@@ -1447,6 +1448,23 @@ they differ between desk and lap mode.
The property is read-only. If the platform doesn't have support the sysfs
class is not created.
+Palm sensor
+------------------
+
+sysfs: psensor_state
+
+Certain thinkpads and mobile workstations are equipped with a palm sensor to
+detect when a user is physically near the device. This device, when present,
+is used in conjunction with the lapmode sensor to decide if WWAN transmission
+can be increased to maximum power.
+
+The property is read-only. If the platform doesn't have support the sysfs
+class is not created.
+
+Note - some platforms have a limitation whereby the EC firmware cannot
+determine if the sensor is installed or not. On these platforms the psensor
+state will always be reported as true to avoid high power being used incorrectly.
+
EXPERIMENTAL: UWB
-----------------
@@ -4079,10 +4079,9 @@ static bool hotkey_notify_6xxx(const u32 hkey,
case TP_HKEY_EV_PALM_DETECTED:
case TP_HKEY_EV_PALM_UNDETECTED:
- /* palm detected hovering the keyboard, forward to user-space
- * via netlink for consumption */
+ /* palm detected - pass on to event handler */
+ tpacpi_driver_event(hkey);
return true;
-
default:
/* report simply as unknown, no sensor dump */
return false;
@@ -9916,6 +9915,99 @@ static struct ibm_struct dytc_driver_data = {
.exit = dytc_exit,
};
+/**********************************************************************
+ * Palm sensor subdriver
+ */
+
+#define PSENSOR_PRESENT_BIT 0 /* Determine if psensor present */
+#define PSENSOR_ON_BIT 1 /* psensor status */
+
+static bool psensor_state;
+
+static void psensor_notify_change(void)
+{
+ sysfs_notify(&tpacpi_pdev->dev.kobj, NULL, "psensor_state");
+}
+
+static int psensor_get(bool *state)
+{
+ acpi_handle psensor_handle;
+ int output;
+
+ if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "GPSS", &psensor_handle)))
+ return -ENODEV;
+
+ if (!acpi_evalf(psensor_handle, &output, NULL, "d"))
+ return -EIO;
+
+ /* Check if sensor has a Psensor */
+ if (!(output & BIT(PSENSOR_PRESENT_BIT)))
+ return -ENODEV;
+
+ /* Return if psensor is set or not */
+ *state = output & BIT(PSENSOR_ON_BIT) ? true : false;
+ return 0;
+}
+
+static void psensor_state_refresh(void)
+{
+ bool new_state;
+ int err;
+
+ err = psensor_get(&new_state);
+ if (err || (new_state == psensor_state))
+ return;
+
+ psensor_state = new_state;
+ psensor_notify_change();
+}
+
+/* sysfs psensor entry */
+static ssize_t psensor_state_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%d\n", psensor_state);
+}
+static DEVICE_ATTR_RO(psensor_state);
+
+static struct attribute *psensor_attributes[] = {
+ &dev_attr_psensor_state.attr,
+ NULL
+};
+
+static const struct attribute_group psensor_attr_group = {
+ .attrs = psensor_attributes,
+};
+
+static int tpacpi_psensor_init(struct ibm_init_struct *iibm)
+{
+ int err;
+
+ err = psensor_get(&psensor_state);
+ /*
+ * If support isn't available (ENODEV) then don't return an error,
+ * just don't create the sysfs group.
+ */
+ if (err == -ENODEV)
+ return 0;
+ /* For all other errors we can flag the failure */
+ if (err)
+ return err;
+
+ return sysfs_create_group(&tpacpi_pdev->dev.kobj, &psensor_attr_group);
+}
+
+static void psensor_exit(void)
+{
+ sysfs_remove_group(&tpacpi_pdev->dev.kobj, &psensor_attr_group);
+}
+
+static struct ibm_struct psensor_driver_data = {
+ .name = "psensor",
+ .exit = psensor_exit,
+};
+
/****************************************************************************
****************************************************************************
*
@@ -9967,6 +10059,10 @@ static void tpacpi_driver_event(const unsigned int hkey_event)
if (hkey_event == TP_HKEY_EV_THM_CSM_COMPLETED)
dytc_lapmode_refresh();
+ if ((hkey_event == TP_HKEY_EV_PALM_DETECTED) ||
+ (hkey_event == TP_HKEY_EV_PALM_UNDETECTED))
+ psensor_state_refresh();
+
}
static void hotkey_driver_event(const unsigned int scancode)
@@ -10409,6 +10505,11 @@ static struct ibm_init_struct ibms_init[] __initdata = {
.init = tpacpi_dytc_init,
.data = &dytc_driver_data,
},
+ {
+ .init = tpacpi_psensor_init,
+ .data = &psensor_driver_data,
+ },
+
};
static int __init set_ibm_param(const char *val, const struct kernel_param *kp)