4 files changed, 165 insertions, 96 deletions

diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt
index eb2f5986e1eb..60953d6c919d 100644
--- a/Documentation/thinkpad-acpi.txt
+++ b/Documentation/thinkpad-acpi.txt
@@ -1,7 +1,7 @@
                      ThinkPad ACPI Extras Driver
 
-                            Version 0.15
-                           July 1st, 2007
+                            Version 0.16
+                          August 2nd, 2007
 
                Borislav Deianov <borislav@users.sf.net>
              Henrique de Moraes Holschuh <hmh@hmh.eng.br>
@@ -161,20 +161,22 @@ system.  Enabling the hotkey functionality of thinkpad-acpi signals the
 firmware that such a driver is present, and modifies how the ThinkPad
 firmware will behave in many situations.
 
+The driver enables the hot key feature automatically when loaded.  The
+feature can later be disabled and enabled back at runtime.  The driver
+will also restore the hot key feature to its previous state and mask
+when it is unloaded.
+
 When the hotkey feature is enabled and the hot key mask is set (see
-below), the various hot keys either generate ACPI events in the
-following format:
+below), the driver will report HKEY events in the following format:
 
         ibm/hotkey HKEY 00000080 0000xxxx
 
-or events over the input layer.  The input layer support accepts the
-standard IOCTLs to remap the keycodes assigned to each hotkey.
+Some of these events refer to hot key presses, but not all.
 
-When the input device is open, the driver will suppress any ACPI hot key
-events that get translated into a meaningful input layer event, in order
-to avoid sending duplicate events to userspace.  Hot keys that are
-mapped to KEY_RESERVED in the keymap are not translated, and will always
-generate an ACPI ibm/hotkey HKEY event, and no input layer events.
+The driver will generate events over the input layer for hot keys and
+radio switches, and over the ACPI netlink layer for other events.  The
+input layer support accepts the standard IOCTLs to remap the keycodes
+assigned to each hot key.
 
 The hot key bit mask allows some control over which hot keys generate
 events.  If a key is "masked" (bit set to 0 in the mask), the firmware
@@ -256,6 +258,20 @@ sysfs notes:
                 disabled" postition, and 1 if the switch is in the
                 "radios enabled" position.
 
+        hotkey_report_mode:
+                Returns the state of the procfs ACPI event report mode
+                filter for hot keys.  If it is set to 1 (the default),
+                all hot key presses are reported both through the input
+                layer and also as ACPI events through procfs (but not
+                through netlink).  If it is set to 2, hot key presses
+                are reported only through the input layer.
+
+                This attribute is read-only in kernels 2.6.23 or later,
+                and read-write on earlier kernels.
+
+                May return -EPERM (write access locked out by module
+                parameter) or -EACCES (read-only).
+
 input layer notes:
 
 A Hot key is mapped to a single input layer EV_KEY event, possibly
@@ -393,21 +409,63 @@ unknown by the driver if the ThinkPad firmware triggered these events on
 hot key press or release, but the firmware will do it for either one, not
 both.
 
-If a key is mapped to KEY_RESERVED, it generates no input events at all,
-and it may generate a legacy thinkpad-acpi ACPI hotkey event.
-
+If a key is mapped to KEY_RESERVED, it generates no input events at all.
 If a key is mapped to KEY_UNKNOWN, it generates an input event that
-includes an scan code, and it may also generate a legacy thinkpad-acpi
-ACPI hotkey event.
-
-If a key is mapped to anything else, it will only generate legacy
-thinkpad-acpi ACPI hotkey events if nobody has opened the input device.
+includes an scan code.  If a key is mapped to anything else, it will
+generate input device EV_KEY events.
 
 Non hot-key ACPI HKEY event map:
 0x5001          Lid closed
 0x5002          Lid opened
 0x7000          Radio Switch may have changed state
 
+The above events are not propagated by the driver, except for legacy
+compatibility purposes when hotkey_report_mode is set to 1.
+
+Compatibility notes:
+
+ibm-acpi and thinkpad-acpi 0.15 (mainline kernels before 2.6.23) never
+supported the input layer, and sent events over the procfs ACPI event
+interface.
+
+To avoid sending duplicate events over the input layer and the ACPI
+event interface, thinkpad-acpi 0.16 implements a module parameter
+(hotkey_report_mode), and also a sysfs device attribute with the same
+name.
+
+Make no mistake here: userspace is expected to switch to using the input
+layer interface of thinkpad-acpi, together with the ACPI netlink event
+interface in kernels 2.6.23 and later, or with the ACPI procfs event
+interface in kernels 2.6.22 and earlier.
+
+If no hotkey_report_mode module parameter is specified (or it is set to
+zero), the driver defaults to mode 1 (see below), and on kernels 2.6.22
+and earlier, also allows one to change the hotkey_report_mode through
+sysfs.  In kernels 2.6.23 and later, where the netlink ACPI event
+interface is available, hotkey_report_mode cannot be changed through
+sysfs (it is read-only).
+
+If the hotkey_report_mode module parameter is set to 1 or 2, it cannot
+be changed later through sysfs (any writes will return -EPERM to signal
+that hotkey_report_mode was locked.  On 2.6.23 and later, where
+hotkey_report_mode cannot be changed at all, writes will return -EACES).
+
+hotkey_report_mode set to 1 makes the driver export through the procfs
+ACPI event interface all hot key presses (which are *also* sent to the
+input layer).  This is a legacy compatibility behaviour, and it is also
+the default mode of operation for the driver.
+
+hotkey_report_mode set to 2 makes the driver filter out the hot key
+presses from the procfs ACPI event interface, so these events will only
+be sent through the input layer.  Userspace that has been updated to use
+the thinkpad-acpi input layer interface should set hotkey_report_mode to
+2.
+
+Hot key press events are never sent to the ACPI netlink event interface.
+Really up-to-date userspace under kernel 2.6.23 and later is to use the
+netlink interface and the input layer interface, and don't bother at all
+with hotkey_report_mode.
+
 
 Bluetooth
 ---------
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index a26655881e6a..73e248fb2ff1 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -202,25 +202,5 @@ config THINKPAD_ACPI_BAY
 
           If you are not sure, say Y here.
 
-config THINKPAD_ACPI_INPUT_ENABLED
-        bool "Enable input layer support by default"
-        depends on THINKPAD_ACPI
-        default n
-        ---help---
-          This option enables thinkpad-acpi hot key handling over the input
-          layer at driver load time.  When it is unset, the driver does not
-          enable hot key handling by default, and also starts up with a mostly
-          empty keymap.
-
-          This option should be enabled if you have a new enough HAL or other
-          userspace support that properly handles the thinkpad-acpi event
-          device.  It auto-tunes the hot key support to those reported by the
-          firmware and enables it automatically.
-
-          If unsure, say N here to retain the old behaviour of ibm-acpi, and
-          thinkpad-acpi up to kernel 2.6.21: userspace will have to enable and
-          set up the thinkpad-acpi hot key handling using the sysfs interace
-          after loading the driver.
-
 
 endif # MISC_DEVICES
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index bb8956d0c104..0222bbaf7b76 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -21,7 +21,7 @@
  *  02110-1301, USA.
  */
 
-#define IBM_VERSION "0.15"
+#define IBM_VERSION "0.16"
 #define TPACPI_SYSFS_VERSION 0x010000
 
 /*
@@ -906,9 +906,26 @@ static ssize_t hotkey_radio_sw_show(struct device *dev,
 static struct device_attribute dev_attr_hotkey_radio_sw =
         __ATTR(hotkey_radio_sw, S_IRUGO, hotkey_radio_sw_show, NULL);
 
+/* sysfs hotkey report_mode -------------------------------------------- */
+static ssize_t hotkey_report_mode_show(struct device *dev,
+                           struct device_attribute *attr,
+                           char *buf)
+{
+        return snprintf(buf, PAGE_SIZE, "%d\n",
+                (hotkey_report_mode != 0) ? hotkey_report_mode : 1);
+}
+
+static struct device_attribute dev_attr_hotkey_report_mode =
+        __ATTR(hotkey_report_mode, S_IRUGO, hotkey_report_mode_show, NULL);
+
 /* --------------------------------------------------------------------- */
 
-static struct attribute *hotkey_mask_attributes[] = {
+static struct attribute *hotkey_attributes[] __initdata = {
+        &dev_attr_hotkey_enable.attr,
+        &dev_attr_hotkey_report_mode.attr,
+};
+
+static struct attribute *hotkey_mask_attributes[] __initdata = {
         &dev_attr_hotkey_mask.attr,
         &dev_attr_hotkey_bios_enabled.attr,
         &dev_attr_hotkey_bios_mask.attr,
@@ -987,11 +1004,12 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
                 str_supported(tp_features.hotkey));
 
         if (tp_features.hotkey) {
-                hotkey_dev_attributes = create_attr_set(7, NULL);
+                hotkey_dev_attributes = create_attr_set(8, NULL);
                 if (!hotkey_dev_attributes)
                         return -ENOMEM;
-                res = add_to_attr_set(hotkey_dev_attributes,
-                                &dev_attr_hotkey_enable.attr);
+                res = add_many_to_attr_set(hotkey_dev_attributes,
+                                hotkey_attributes,
+                                ARRAY_SIZE(hotkey_attributes));
                 if (res)
                         return res;
 
@@ -1055,11 +1073,6 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
                                 TPACPI_HOTKEY_MAP_SIZE);
                 }
 
-#ifndef CONFIG_THINKPAD_ACPI_INPUT_ENABLED
-                for (i = 0; i < 12; i++)
-                        hotkey_keycode_map[i] = KEY_UNKNOWN;
-#endif /* ! CONFIG_THINKPAD_ACPI_INPUT_ENABLED */
-
                 set_bit(EV_KEY, tpacpi_inputdev->evbit);
                 set_bit(EV_MSC, tpacpi_inputdev->evbit);
                 set_bit(MSC_SCAN, tpacpi_inputdev->mscbit);
@@ -1081,14 +1094,17 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
                         set_bit(SW_RADIO, tpacpi_inputdev->swbit);
                 }
 
-#ifdef CONFIG_THINKPAD_ACPI_INPUT_ENABLED
                 dbg_printk(TPACPI_DBG_INIT,
                                 "enabling hot key handling\n");
                 res = hotkey_set(1, (hotkey_all_mask & ~hotkey_reserved_mask)
                                         | hotkey_orig_mask);
                 if (res)
                         return res;
-#endif /* CONFIG_THINKPAD_ACPI_INPUT_ENABLED */
+
+                dbg_printk(TPACPI_DBG_INIT,
+                                "legacy hot key reporting over procfs %s\n",
+                                (hotkey_report_mode < 2) ?
+                                        "enabled" : "disabled");
         }
 
         return (tp_features.hotkey)? 0 : 1;
@@ -1142,58 +1158,65 @@ static void hotkey_notify(struct ibm_struct *ibm, u32 event)
 {
         u32 hkey;
         unsigned int keycode, scancode;
-        int sendacpi = 1;
+        int send_acpi_ev = 0;
 
         if (event == 0x80 && acpi_evalf(hkey_handle, &hkey, "MHKP", "d")) {
-                if (tpacpi_inputdev->users > 0) {
-                        switch (hkey >> 12) {
-                        case 1:
-                                /* 0x1000-0x1FFF: key presses */
-                                scancode = hkey & 0xfff;
-                                if (scancode > 0 && scancode < 0x21) {
-                                        scancode--;
-                                        keycode = hotkey_keycode_map[scancode];
-                                        tpacpi_input_send_key(scancode, keycode);
-                                        sendacpi = (keycode == KEY_RESERVED
-                                                || keycode == KEY_UNKNOWN);
-                                } else {
-                                        printk(IBM_ERR
-                                               "hotkey 0x%04x out of range for keyboard map\n",
-                                               hkey);
-                                }
-                                break;
-                        case 5:
-                                /* 0x5000-0x5FFF: LID */
-                                /* we don't handle it through this path, just
-                                 * eat up known LID events */
-                                if (hkey != 0x5001 && hkey != 0x5002) {
-                                        printk(IBM_ERR
-                                                "unknown LID-related hotkey event: 0x%04x\n",
-                                                hkey);
-                                }
+                switch (hkey >> 12) {
+                case 1:
+                        /* 0x1000-0x1FFF: key presses */
+                        scancode = hkey & 0xfff;
+                        if (scancode > 0 && scancode < 0x21) {
+                                scancode--;
+                                keycode = hotkey_keycode_map[scancode];
+                                tpacpi_input_send_key(scancode, keycode);
+                        } else {
+                                printk(IBM_ERR
+                                       "hotkey 0x%04x out of range for keyboard map\n",
+                                       hkey);
+                                send_acpi_ev = 1;
+                        }
+                        break;
+                case 5:
+                        /* 0x5000-0x5FFF: LID */
+                        /* we don't handle it through this path, just
+                         * eat up known LID events */
+                        if (hkey != 0x5001 && hkey != 0x5002) {
+                                printk(IBM_ERR
+                                        "unknown LID-related hotkey event: 0x%04x\n",
+                                        hkey);
+                                send_acpi_ev = 1;
+                        }
+                        break;
+                case 7:
+                        /* 0x7000-0x7FFF: misc */
+                        if (tp_features.hotkey_wlsw && hkey == 0x7000) {
+                                tpacpi_input_send_radiosw();
                                 break;
-                        case 7:
-                                /* 0x7000-0x7FFF: misc */
-                                if (tp_features.hotkey_wlsw && hkey == 0x7000) {
-                                                tpacpi_input_send_radiosw();
-                                                sendacpi = 0;
-                                        break;
-                                }
-                                /* fallthrough to default */
-                        default:
-                                /* case 2: dock-related */
-                                /*      0x2305 - T43 waking up due to bay lever eject while aslept */
-                                /* case 3: ultra-bay related. maybe bay in dock? */
-                                /*      0x3003 - T43 after wake up by bay lever eject (0x2305) */
-                                printk(IBM_NOTICE "unhandled hotkey event 0x%04x\n", hkey);
                         }
+                        /* fallthrough to default */
+                default:
+                        /* case 2: dock-related */
+                        /*      0x2305 - T43 waking up due to bay lever eject while aslept */
+                        /* case 3: ultra-bay related. maybe bay in dock? */
+                        /*      0x3003 - T43 after wake up by bay lever eject (0x2305) */
+                        printk(IBM_NOTICE "unhandled HKEY event 0x%04x\n", hkey);
+                        send_acpi_ev = 1;
                 }
-
-                if (sendacpi)
-                        acpi_bus_generate_proc_event(ibm->acpi->device, event, hkey);
         } else {
                 printk(IBM_ERR "unknown hotkey notification event %d\n", event);
-                acpi_bus_generate_proc_event(ibm->acpi->device, event, 0);
+                hkey = 0;
+                send_acpi_ev = 1;
+        }
+
+        /* Legacy events */
+        if (send_acpi_ev || hotkey_report_mode < 2)
+                acpi_bus_generate_proc_event(ibm->acpi->device, event, hkey);
+
+        /* netlink events */
+        if (send_acpi_ev) {
+                acpi_bus_generate_netlink_event(ibm->acpi->device->pnp.device_class,
+                                                ibm->acpi->device->dev.bus_id,
+                                                event, hkey);
         }
 }
 
@@ -4623,6 +4646,9 @@ module_param_named(fan_control, fan_control_allowed, bool, 0);
 static int brightness_mode;
 module_param_named(brightness_mode, brightness_mode, int, 0);
 
+static unsigned int hotkey_report_mode;
+module_param(hotkey_report_mode, uint, 0);
+
 #define IBM_PARAM(feature) \
         module_param_call(feature, set_ibm_param, NULL, NULL, 0)
 
@@ -4648,6 +4674,10 @@ static int __init thinkpad_acpi_module_init(void)
 {
         int ret, i;
 
+        /* Parameter checking */
+        if (hotkey_report_mode > 2)
+                return -EINVAL;
+
         /* Driver-level probe */
 
         get_thinkpad_model_data(&thinkpad_id);
diff --git a/drivers/misc/thinkpad_acpi.h b/drivers/misc/thinkpad_acpi.h
index eee8809a50d9..082a1cbc16c0 100644
--- a/drivers/misc/thinkpad_acpi.h
+++ b/drivers/misc/thinkpad_acpi.h
@@ -181,6 +181,7 @@ static void tpacpi_remove_driver_attributes(struct device_driver *drv);
 static int experimental;
 static u32 dbg_level;
 static int force_load;
+static unsigned int hotkey_report_mode;
 
 static int thinkpad_acpi_module_init(void);
 static void thinkpad_acpi_module_exit(void);