4 files changed, 784 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 5edb541c2fad..f9f6d4b75c5e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3153,6 +3153,11 @@ M:	olof@lixom.net
 L:      i2c@lm-sensors.org
 S:      Maintained
 
+PANASONIC LAPTOP ACPI EXTRAS DRIVER
+P:      Harald Welte
+M:      laforge@gnumonks.org
+S:      Maintained
+
 PARALLEL PORT SUPPORT
 L:      linux-parport@lists.infradead.org (subscribers-only)
 S:      Orphan
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 6abb95919c38..0ed74d076a27 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -246,6 +246,17 @@ config MSI_LAPTOP
 
           If you have an MSI S270 laptop, say Y or M here.
 
+config PANASONIC_LAPTOP
+        tristate "Panasonic Laptop Extras"
+        depends on X86 && INPUT && ACPI
+        depends on BACKLIGHT_CLASS_DEVICE
+        ---help---
+          This driver adds support for access to backlight control and hotkeys
+          on Panasonic Let's Note laptops.
+
+          If you have a Panasonic Let's note laptop (such as the R1(N variant),
+          R2, R3, R5, T2, W2 and Y2 series), say Y.
+
 config COMPAL_LAPTOP
         tristate "Compal Laptop Extras"
         depends on X86
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index c6c13f60b452..909e2468cdc9 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_SGI_IOC4)		+= ioc4.o
 obj-$(CONFIG_SONY_LAPTOP)       += sony-laptop.o
 obj-$(CONFIG_THINKPAD_ACPI)     += thinkpad_acpi.o
 obj-$(CONFIG_FUJITSU_LAPTOP)    += fujitsu-laptop.o
+obj-$(CONFIG_PANASONIC_LAPTOP)  += panasonic-laptop.o
 obj-$(CONFIG_EEPROM_93CX6)      += eeprom_93cx6.o
 obj-$(CONFIG_INTEL_MENLOW)      += intel_menlow.o
 obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
diff --git a/drivers/misc/panasonic-laptop.c b/drivers/misc/panasonic-laptop.c
new file mode 100644
index 000000000000..9aecda5a399c
--- /dev/null
+++ b/drivers/misc/panasonic-laptop.c
@@ -0,0 +1,767 @@
+/*
+ *  Panasonic HotKey and LCD brightness control driver
+ *  (C) 2004 Hiroshi Miura <miura@da-cha.org>
+ *  (C) 2004 NTT DATA Intellilink Co. http://www.intellilink.co.jp/
+ *  (C) YOKOTA Hiroshi <yokota (at) netlab. is. tsukuba. ac. jp>
+ *  (C) 2004 David Bronaugh <dbronaugh>
+ *  (C) 2006-2008 Harald Welte <laforge@gnumonks.org>
+ *
+ *  derived from toshiba_acpi.c, Copyright (C) 2002-2004 John Belmonte
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  publicshed by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ *
+ *---------------------------------------------------------------------------
+ *
+ * ChangeLog:
+ *      Sep.23, 2008    Harald Welte <laforge@gnumonks.org>
+ *              -v0.95  rename driver from drivers/acpi/pcc_acpi.c to
+ *                      drivers/misc/panasonic-laptop.c
+ *
+ *      Jul.04, 2008    Harald Welte <laforge@gnumonks.org>
+ *              -v0.94  replace /proc interface with device attributes
+ *                      support {set,get}keycode on th input device
+ *
+ *      Jun.27, 2008    Harald Welte <laforge@gnumonks.org>
+ *              -v0.92  merge with 2.6.26-rc6 input API changes
+ *                      remove broken <= 2.6.15 kernel support
+ *                      resolve all compiler warnings
+ *                      various coding style fixes (checkpatch.pl)
+ *                      add support for backlight api
+ *                      major code restructuring
+ *
+ *      Dac.28, 2007    Harald Welte <laforge@gnumonks.org>
+ *              -v0.91  merge with 2.6.24-rc6 ACPI changes
+ *
+ *      Nov.04, 2006    Hiroshi Miura <miura@da-cha.org>
+ *              -v0.9   remove warning about section reference.
+ *                      remove acpi_os_free
+ *                      add /proc/acpi/pcc/brightness interface for HAL access
+ *                      merge dbronaugh's enhancement
+ *                      Aug.17, 2004 David Bronaugh (dbronaugh)
+ *                              - Added screen brightness setting interface
+ *                                Thanks to FreeBSD crew (acpi_panasonic.c)
+ *                                for the ideas I needed to accomplish it
+ *
+ *      May.29, 2006    Hiroshi Miura <miura@da-cha.org>
+ *              -v0.8.4 follow to change keyinput structure
+ *                      thanks Fabian Yamaguchi <fabs@cs.tu-berlin.de>,
+ *                      Jacob Bower <jacob.bower@ic.ac.uk> and
+ *                      Hiroshi Yokota for providing solutions.
+ *
+ *      Oct.02, 2004    Hiroshi Miura <miura@da-cha.org>
+ *              -v0.8.2 merge code of YOKOTA Hiroshi
+ *                                      <yokota@netlab.is.tsukuba.ac.jp>.
+ *                      Add sticky key mode interface.
+ *                      Refactoring acpi_pcc_generate_keyinput().
+ *
+ *      Sep.15, 2004    Hiroshi Miura <miura@da-cha.org>
+ *              -v0.8   Generate key input event on input subsystem.
+ *                      This is based on yet another driver written by
+ *                                                      Ryuta Nakanishi.
+ *
+ *      Sep.10, 2004    Hiroshi Miura <miura@da-cha.org>
+ *              -v0.7   Change proc interface functions using seq_file
+ *                      facility as same as other ACPI drivers.
+ *
+ *      Aug.28, 2004    Hiroshi Miura <miura@da-cha.org>
+ *              -v0.6.4 Fix a silly error with status checking
+ *
+ *      Aug.25, 2004    Hiroshi Miura <miura@da-cha.org>
+ *              -v0.6.3 replace read_acpi_int by standard function
+ *                                                      acpi_evaluate_integer
+ *                      some clean up and make smart copyright notice.
+ *                      fix return value of pcc_acpi_get_key()
+ *                      fix checking return value of acpi_bus_register_driver()
+ *
+ *      Aug.22, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
+ *              -v0.6.2 Add check on ACPI data (num_sifr)
+ *                      Coding style cleanups, better error messages/handling
+ *                      Fixed an off-by-one error in memory allocation
+ *
+ *      Aug.21, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
+ *              -v0.6.1 Fix a silly error with status checking
+ *
+ *      Aug.20, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
+ *              - v0.6  Correct brightness controls to reflect reality
+ *                      based on information gleaned by Hiroshi Miura
+ *                      and discussions with Hiroshi Miura
+ *
+ *      Aug.10, 2004    Hiroshi Miura <miura@da-cha.org>
+ *              - v0.5  support LCD brightness control
+ *                      based on the disclosed information by MEI.
+ *
+ *      Jul.25, 2004    Hiroshi Miura <miura@da-cha.org>
+ *              - v0.4  first post version
+ *                      add function to retrive SIFR
+ *
+ *      Jul.24, 2004    Hiroshi Miura <miura@da-cha.org>
+ *              - v0.3  get proper status of hotkey
+ *
+ *      Jul.22, 2004    Hiroshi Miura <miura@da-cha.org>
+ *              - v0.2  add HotKey handler
+ *
+ *      Jul.17, 2004    Hiroshi Miura <miura@da-cha.org>
+ *              - v0.1  start from toshiba_acpi driver written by John Belmonte
+ *
+ */
+
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/backlight.h>
+#include <linux/ctype.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <linux/input.h>
+
+
+#ifndef ACPI_HOTKEY_COMPONENT
+#define ACPI_HOTKEY_COMPONENT   0x10000000
+#endif
+
+#define _COMPONENT              ACPI_HOTKEY_COMPONENT
+
+MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
+MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
+MODULE_LICENSE("GPL");
+
+#define LOGPREFIX "pcc_acpi: "
+
+/* Define ACPI PATHs */
+/* Lets note hotkeys */
+#define METHOD_HKEY_QUERY       "HINF"
+#define METHOD_HKEY_SQTY        "SQTY"
+#define METHOD_HKEY_SINF        "SINF"
+#define METHOD_HKEY_SSET        "SSET"
+#define HKEY_NOTIFY              0x80
+
+#define ACPI_PCC_DRIVER_NAME    "Panasonic Laptop Support"
+#define ACPI_PCC_DEVICE_NAME    "Hotkey"
+#define ACPI_PCC_CLASS          "pcc"
+
+#define ACPI_PCC_INPUT_PHYS     "panasonic/hkey0"
+
+/* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
+   ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
+*/
+enum SINF_BITS { SINF_NUM_BATTERIES = 0,
+                 SINF_LCD_TYPE,
+                 SINF_AC_MAX_BRIGHT,
+                 SINF_AC_MIN_BRIGHT,
+                 SINF_AC_CUR_BRIGHT,
+                 SINF_DC_MAX_BRIGHT,
+                 SINF_DC_MIN_BRIGHT,
+                 SINF_DC_CUR_BRIGHT,
+                 SINF_MUTE,
+                 SINF_RESERVED,
+                 SINF_ENV_STATE,
+                 SINF_STICKY_KEY = 0x80,
+        };
+/* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
+
+static int acpi_pcc_hotkey_add(struct acpi_device *device);
+static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type);
+static int acpi_pcc_hotkey_resume(struct acpi_device *device);
+
+static const struct acpi_device_id pcc_device_ids[] = {
+        { "MAT0012", 0},
+        { "MAT0013", 0},
+        { "MAT0018", 0},
+        { "MAT0019", 0},
+        { "", 0},
+};
+
+static struct acpi_driver acpi_pcc_driver = {
+        .name =         ACPI_PCC_DRIVER_NAME,
+        .class =        ACPI_PCC_CLASS,
+        .ids =          pcc_device_ids,
+        .ops =          {
+                                .add =          acpi_pcc_hotkey_add,
+                                .remove =       acpi_pcc_hotkey_remove,
+                                .resume =       acpi_pcc_hotkey_resume,
+                        },
+};
+
+#define KEYMAP_SIZE             11
+static const int initial_keymap[KEYMAP_SIZE] = {
+        /*  0 */ KEY_RESERVED,
+        /*  1 */ KEY_BRIGHTNESSDOWN,
+        /*  2 */ KEY_BRIGHTNESSUP,
+        /*  3 */ KEY_DISPLAYTOGGLE,
+        /*  4 */ KEY_MUTE,
+        /*  5 */ KEY_VOLUMEDOWN,
+        /*  6 */ KEY_VOLUMEUP,
+        /*  7 */ KEY_SLEEP,
+        /*  8 */ KEY_PROG1, /* Change CPU boost */
+        /*  9 */ KEY_BATTERY,
+        /* 10 */ KEY_SUSPEND,
+};
+
+struct pcc_acpi {
+        acpi_handle             handle;
+        unsigned long           num_sifr;
+        int                     sticky_mode;
+        u32                     *sinf;
+        struct acpi_device      *device;
+        struct input_dev        *input_dev;
+        struct backlight_device *backlight;
+        int                     keymap[KEYMAP_SIZE];
+};
+
+struct pcc_keyinput {
+        struct acpi_hotkey      *hotkey;
+};
+
+/* method access functions */
+static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
+{
+        union acpi_object in_objs[] = {
+                { .integer.type  = ACPI_TYPE_INTEGER,
+                  .integer.value = func, },
+                { .integer.type  = ACPI_TYPE_INTEGER,
+                  .integer.value = val, },
+        };
+        struct acpi_object_list params = {
+                .count   = ARRAY_SIZE(in_objs),
+                .pointer = in_objs,
+        };
+        acpi_status status = AE_OK;
+
+        ACPI_FUNCTION_TRACE("acpi_pcc_write_sset");
+
+        status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
+                                      &params, NULL);
+
+        return status == AE_OK;
+}
+
+static inline int acpi_pcc_get_sqty(struct acpi_device *device)
+{
+        unsigned long s;
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE("acpi_pcc_get_sqty");
+
+        status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
+                                       NULL, &s);
+        if (ACPI_SUCCESS(status))
+                return s;
+        else {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "evaluation error HKEY.SQTY\n"));
+                return -EINVAL;
+        }
+}
+
+static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
+{
+        acpi_status status;
+        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+        union acpi_object *hkey = NULL;
+        int i;
+
+        ACPI_FUNCTION_TRACE("acpi_pcc_retrieve_biosdata");
+
+        status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, 0,
+                                      &buffer);
+        if (ACPI_FAILURE(status)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "evaluation error HKEY.SINF\n"));
+                return 0;
+        }
+
+        hkey = buffer.pointer;
+        if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
+                goto end;
+        }
+
+        if (pcc->num_sifr < hkey->package.count) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                 "SQTY reports bad SINF length\n"));
+                status = AE_ERROR;
+                goto end;
+        }
+
+        for (i = 0; i < hkey->package.count; i++) {
+                union acpi_object *element = &(hkey->package.elements[i]);
+                if (likely(element->type == ACPI_TYPE_INTEGER)) {
+                        sinf[i] = element->integer.value;
+                } else
+                        ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                         "Invalid HKEY.SINF data\n"));
+        }
+        sinf[hkey->package.count] = -1;
+
+end:
+        kfree(buffer.pointer);
+        return status == AE_OK;
+}
+
+/* backlight API interface functions */
+
+/* This driver currently treats AC and DC brightness identical,
+ * since we don't need to invent an interface to the core ACPI
+ * logic to receive events in case a power supply is plugged in
+ * or removed */
+
+static int bl_get(struct backlight_device *bd)
+{
+        struct pcc_acpi *pcc = bl_get_data(bd);
+
+        if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
+                return -EIO;
+
+        return pcc->sinf[SINF_AC_CUR_BRIGHT];
+}
+
+static int bl_set_status(struct backlight_device *bd)
+{
+        struct pcc_acpi *pcc = bl_get_data(bd);
+        int bright = bd->props.brightness;
+        int rc;
+
+        if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
+                return -EIO;
+
+        if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
+                bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
+
+        if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
+                bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
+
+        if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
+            bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
+                return -EINVAL;
+
+        rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
+        if (rc < 0)
+                return rc;
+
+        return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
+}
+
+static struct backlight_ops pcc_backlight_ops = {
+        .get_brightness = bl_get,
+        .update_status  = bl_set_status,
+};
+
+
+/* sysfs user interface functions */
+
+static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
+                            char *buf)
+{
+        struct acpi_device *acpi = to_acpi_device(dev);
+        struct pcc_acpi *pcc = acpi_driver_data(acpi);
+
+        if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
+                return -EIO;
+
+        return sprintf(buf, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
+}
+
+static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
+                            char *buf)
+{
+        struct acpi_device *acpi = to_acpi_device(dev);
+        struct pcc_acpi *pcc = acpi_driver_data(acpi);
+
+        if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
+                return -EIO;
+
+        return sprintf(buf, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
+}
+
+static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+        struct acpi_device *acpi = to_acpi_device(dev);
+        struct pcc_acpi *pcc = acpi_driver_data(acpi);
+
+        if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
+                return -EIO;
+
+        return sprintf(buf, "%u\n", pcc->sinf[SINF_MUTE]);
+}
+
+static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
+                           char *buf)
+{
+        struct acpi_device *acpi = to_acpi_device(dev);
+        struct pcc_acpi *pcc = acpi_driver_data(acpi);
+
+        if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
+                return -EIO;
+
+        return sprintf(buf, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
+}
+
+static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
+                          const char *buf, size_t count)
+{
+        struct acpi_device *acpi = to_acpi_device(dev);
+        struct pcc_acpi *pcc = acpi_driver_data(acpi);
+        int val;
+
+        if (count && sscanf(buf, "%i", &val) == 1 &&
+            (val == 0 || val == 1)) {
+                acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
+                pcc->sticky_mode = val;
+        }
+
+        return count;
+}
+
+static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
+static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
+static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
+static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
+
+static struct attribute *pcc_sysfs_entries[] = {
+        &dev_attr_numbatt.attr,
+        &dev_attr_lcdtype.attr,
+        &dev_attr_mute.attr,
+        &dev_attr_sticky_key.attr,
+        NULL,
+};
+
+static struct attribute_group pcc_attr_group = {
+        .name   = NULL,         /* put in device directory */
+        .attrs  = pcc_sysfs_entries,
+};
+
+
+/* hotkey input device driver */
+
+static int pcc_getkeycode(struct input_dev *dev, int scancode, int *keycode)
+{
+        struct pcc_acpi *pcc = input_get_drvdata(dev);
+
+        if (scancode >= ARRAY_SIZE(pcc->keymap))
+                return -EINVAL;
+
+        *keycode = pcc->keymap[scancode];
+
+        return 0;
+}
+
+static int keymap_get_by_keycode(struct pcc_acpi *pcc, int keycode)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
+                if (pcc->keymap[i] == keycode)
+                        return i+1;
+        }
+
+        return 0;
+}
+
+static int pcc_setkeycode(struct input_dev *dev, int scancode, int keycode)
+{
+        struct pcc_acpi *pcc = input_get_drvdata(dev);
+        int oldkeycode;
+
+        if (scancode >= ARRAY_SIZE(pcc->keymap))
+                return -EINVAL;
+
+        if (keycode < 0 || keycode > KEY_MAX)
+                return -EINVAL;
+
+        oldkeycode = pcc->keymap[scancode];
+        pcc->keymap[scancode] = keycode;
+
+        set_bit(keycode, dev->keybit);
+
+        if (!keymap_get_by_keycode(pcc, oldkeycode))
+                clear_bit(oldkeycode, dev->keybit);
+
+        return 0;
+}
+
+static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
+{
+        struct input_dev *hotk_input_dev = pcc->input_dev;
+        int rc;
+        int key_code, hkey_num;
+        unsigned long result;
+
+        ACPI_FUNCTION_TRACE("acpi_pcc_generate_keyinput");
+
+        rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
+                                   NULL, &result);
+        if (!ACPI_SUCCESS(rc)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                 "error getting hotkey status\n"));
+                return;
+        }
+
+        acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
+
+        hkey_num = result & 0xf;
+
+        if (hkey_num < 0 || hkey_num > ARRAY_SIZE(pcc->keymap)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "hotkey number out of range: %d\n",
+                                  hkey_num));
+                return;
+        }
+
+        key_code = pcc->keymap[hkey_num];
+
+        if (key_code != KEY_RESERVED) {
+                int pushed = (result & 0x80) ? TRUE : FALSE;
+
+                input_report_key(hotk_input_dev, key_code, pushed);
+                input_sync(hotk_input_dev);
+        }
+
+        return;
+}
+
+static void acpi_pcc_hotkey_notify(acpi_handle handle, u32 event, void *data)
+{
+        struct pcc_acpi *pcc = (struct pcc_acpi *) data;
+
+        ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_notify");
+
+        switch (event) {
+        case HKEY_NOTIFY:
+                acpi_pcc_generate_keyinput(pcc);
+                break;
+        default:
+                /* nothing to do */
+                break;
+        }
+}
+
+static int acpi_pcc_init_input(struct pcc_acpi *pcc)
+{
+        int i, rc;
+
+        ACPI_FUNCTION_TRACE("acpi_pcc_init_input");
+
+        pcc->input_dev = input_allocate_device();
+        if (!pcc->input_dev) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Couldn't allocate input device for hotkey"));
+                return -ENOMEM;
+        }
+
+        pcc->input_dev->evbit[0] = BIT(EV_KEY);
+
+        pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
+        pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
+        pcc->input_dev->id.bustype = BUS_HOST;
+        pcc->input_dev->id.vendor = 0x0001;
+        pcc->input_dev->id.product = 0x0001;
+        pcc->input_dev->id.version = 0x0100;
+        pcc->input_dev->getkeycode = pcc_getkeycode;
+        pcc->input_dev->setkeycode = pcc_setkeycode;
+
+        /* load initial keymap */
+        memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
+
+        for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
+                __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
+        __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
+
+        input_set_drvdata(pcc->input_dev, pcc);
+
+        rc = input_register_device(pcc->input_dev);
+        if (rc < 0)
+                input_free_device(pcc->input_dev);
+
+        return rc;
+}
+
+/* kernel module interface */
+
+static int acpi_pcc_hotkey_resume(struct acpi_device *device)
+{
+        struct pcc_acpi *pcc = acpi_driver_data(device);
+        acpi_status status = AE_OK;
+
+        ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_resume");
+
+        if (device == NULL || pcc == NULL)
+                return -EINVAL;
+
+        ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
+                          pcc->sticky_mode));
+
+        status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
+
+        return status == AE_OK ? 0 : -EINVAL;
+}
+
+static int acpi_pcc_hotkey_add(struct acpi_device *device)
+{
+        acpi_status status;
+        struct pcc_acpi *pcc;
+        int num_sifr, result;
+
+        ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_add");
+
+        if (!device)
+                return -EINVAL;
+
+        num_sifr = acpi_pcc_get_sqty(device);
+
+        if (num_sifr > 255) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
+                return -ENODEV;
+        }
+
+        pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
+        if (!pcc) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Couldn't allocate mem for pcc"));
+                return -ENOMEM;
+        }
+
+        pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
+        if (!pcc->sinf) {
+                result = -ENOMEM;
+                goto out_hotkey;
+        }
+
+        pcc->device = device;
+        pcc->handle = device->handle;
+        pcc->num_sifr = num_sifr;
+        acpi_driver_data(device) = pcc;
+        strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
+        strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
+
+        result = acpi_pcc_init_input(pcc);
+        if (result) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Error installing keyinput handler\n"));
+                goto out_sinf;
+        }
+
+        /* initialize hotkey input device */
+        status = acpi_install_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
+                                             acpi_pcc_hotkey_notify, pcc);
+
+        if (ACPI_FAILURE(status)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Error installing notify handler\n"));
+                result = -ENODEV;
+                goto out_input;
+        }
+
+        /* initialize backlight */
+        pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
+                                                   &pcc_backlight_ops);
+        if (IS_ERR(pcc->backlight))
+                goto out_notify;
+
+        if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                 "Couldn't retrieve BIOS data\n"));
+                goto out_backlight;
+        }
+
+        /* read the initial brightness setting from the hardware */
+        pcc->backlight->props.max_brightness =
+                                        pcc->sinf[SINF_AC_MAX_BRIGHT];
+        pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
+
+        /* read the initial sticky key mode from the hardware */
+        pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
+
+        /* add sysfs attributes */
+        result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
+        if (result)
+                goto out_backlight;
+
+        return 0;
+
+out_backlight:
+        backlight_device_unregister(pcc->backlight);
+out_notify:
+        acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
+                                   acpi_pcc_hotkey_notify);
+out_input:
+        input_unregister_device(pcc->input_dev);
+        /* no need to input_free_device() since core input API refcount and
+         * free()s the device */
+out_sinf:
+        kfree(pcc->sinf);
+out_hotkey:
+        kfree(pcc);
+
+        return result;
+}
+
+static int __init acpi_pcc_init(void)
+{
+        int result = 0;
+
+        ACPI_FUNCTION_TRACE("acpi_pcc_init");
+
+        if (acpi_disabled)
+                return -ENODEV;
+
+        result = acpi_bus_register_driver(&acpi_pcc_driver);
+        if (result < 0) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Error registering hotkey driver\n"));
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
+{
+        struct pcc_acpi *pcc = acpi_driver_data(device);
+
+        ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_remove");
+
+        if (!device || !pcc)
+                return -EINVAL;
+
+        sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
+
+        backlight_device_unregister(pcc->backlight);
+
+        acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
+                                   acpi_pcc_hotkey_notify);
+
+        input_unregister_device(pcc->input_dev);
+        /* no need to input_free_device() since core input API refcount and
+         * free()s the device */
+
+        kfree(pcc->sinf);
+        kfree(pcc);
+
+        return 0;
+}
+
+static void __exit acpi_pcc_exit(void)
+{
+        ACPI_FUNCTION_TRACE("acpi_pcc_exit");
+
+        acpi_bus_unregister_driver(&acpi_pcc_driver);
+}
+
+module_init(acpi_pcc_init);
+module_exit(acpi_pcc_exit);