platform/x86: thinkpad-acpi: Add support for new hotkey for camera shutter switch

New Lenovo Thinkpad models, e.g. the 'X9-14 Gen 1' and 'X9-15 Gen 1'
has new shortcut on F9 key i.e to switch camera shutter and it
send a new 0x131b hkey event when F9 key is pressed.

This commit adds support for new hkey 0x131b.

Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Nitin Joshi <nitjoshi@gmail.com>
Link: https://lore.kernel.org/r/20250505150152.27968-1-nitjoshi@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 9bb191a32e8073a0a9d2ec6c5b0b2b0802b7249d..bdd33671a79f9bd8cfaa1ac340ed713ae2be9f13 100644 (file)
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -182,6 +182,7 @@ enum tpacpi_hkey_event_t {
                                                   * directly in the sparse-keymap.
                                                   */
        TP_HKEY_EV_AMT_TOGGLE           = 0x131a, /* Toggle AMT on/off */
+       TP_HKEY_EV_CAMERASHUTTER_TOGGLE = 0x131b, /* Toggle Camera Shutter */
        TP_HKEY_EV_DOUBLETAP_TOGGLE     = 0x131c, /* Toggle trackpoint doubletap on/off */
        TP_HKEY_EV_PROFILE_TOGGLE       = 0x131f, /* Toggle platform profile in 2024 systems */
        TP_HKEY_EV_PROFILE_TOGGLE2      = 0x1401, /* Toggle platform profile in 2025 + systems */
@@ -2250,6 +2251,25 @@ static void tpacpi_input_send_tabletsw(void)
        }
 }
 
+#define GCES_NO_SHUTTER_DEVICE BIT(31)
+
+static int get_camera_shutter(void)
+{
+       acpi_handle gces_handle;
+       int output;
+
+       if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "GCES", &gces_handle)))
+               return -ENODEV;
+
+       if (!acpi_evalf(gces_handle, &output, NULL, "dd", 0))
+               return -EIO;
+
+       if (output & GCES_NO_SHUTTER_DEVICE)
+               return -ENODEV;
+
+       return output;
+}
+
 static bool tpacpi_input_send_key(const u32 hkey, bool *send_acpi_ev)
 {
        bool known_ev;
@@ -3303,7 +3323,7 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
        const struct key_entry *keymap;
        bool radiosw_state  = false;
        bool tabletsw_state = false;
-       int hkeyv, res, status;
+       int hkeyv, res, status, camera_shutter_state;
 
        vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
                        "initializing hotkey subdriver\n");
@@ -3467,6 +3487,12 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
        if (res)
                return res;
 
+       camera_shutter_state = get_camera_shutter();
+       if (camera_shutter_state >= 0) {
+               input_set_capability(tpacpi_inputdev, EV_SW, SW_CAMERA_LENS_COVER);
+               input_report_switch(tpacpi_inputdev, SW_CAMERA_LENS_COVER, camera_shutter_state);
+       }
+
        if (tp_features.hotkey_wlsw) {
                input_set_capability(tpacpi_inputdev, EV_SW, SW_RFKILL_ALL);
                input_report_switch(tpacpi_inputdev,
@@ -11161,6 +11187,8 @@ static struct platform_driver tpacpi_hwmon_pdriver = {
  */
 static bool tpacpi_driver_event(const unsigned int hkey_event)
 {
+       int camera_shutter_state;
+
        switch (hkey_event) {
        case TP_HKEY_EV_BRGHT_UP:
        case TP_HKEY_EV_BRGHT_DOWN:
@@ -11236,6 +11264,19 @@ static bool tpacpi_driver_event(const unsigned int hkey_event)
                else
                        dytc_control_amt(!dytc_amt_active);
 
+               return true;
+       case TP_HKEY_EV_CAMERASHUTTER_TOGGLE:
+               camera_shutter_state = get_camera_shutter();
+               if (camera_shutter_state < 0) {
+                       pr_err("Error retrieving camera shutter state after shutter event\n");
+                       return true;
+               }
+               mutex_lock(&tpacpi_inputdev_send_mutex);
+
+               input_report_switch(tpacpi_inputdev, SW_CAMERA_LENS_COVER, camera_shutter_state);
+               input_sync(tpacpi_inputdev);
+
+               mutex_unlock(&tpacpi_inputdev_send_mutex);
                return true;
        case TP_HKEY_EV_DOUBLETAP_TOGGLE:
                tp_features.trackpoint_doubletap = !tp_features.trackpoint_doubletap;