[1/3] lenovo-sl-laptop : driver source

[Alexandre Rostovtsev <tetromino@gmail.com>]

This patch contains the actual source of the lenovo-sl-laptop driver.

Signed-off-by: Alexandre Rostovtsev <tetromino@gmail.com>

diff --git a/drivers/staging/lenovo-sl-laptop/lenovo-sl-laptop.c b/drivers/staging/lenovo-sl-laptop/lenovo-sl-laptop.c
new file mode 100644
index 0000000..4ea8166
--- /dev/null
+++ b/drivers/staging/lenovo-sl-laptop/lenovo-sl-laptop.c
@@ -0,0 +1,1107 @@
+/*
+ *  lenovo-sl-laptop.c - Lenovo ThinkPad SL Series Extras Driver
+ *
+ *
+ *  Copyright (C) 2008-2009 Alexandre Rostovtsev <tetromino@gmail.com>
+ *
+ *  Largely based on thinkpad_acpi.c, eeepc-laptop.c, and video.c which
+ *  are copyright their respective authors.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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., 51 Franklin Street, Fifth Floor, Boston, MA
+ *  02110-1301, USA.
+ *
+ */
+
+#define LENSL_LAPTOP_VERSION "0.02"
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/pci_ids.h>
+#include <linux/rfkill.h>
+#include <linux/backlight.h>
+#include <linux/platform_device.h>
+
+#include <linux/input.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+
+#define LENSL_MODULE_DESC "Lenovo ThinkPad SL Series Extras driver"
+#define LENSL_MODULE_NAME "lenovo-sl-laptop"
+
+MODULE_AUTHOR("Alexandre Rostovtsev");
+MODULE_DESCRIPTION(LENSL_MODULE_DESC);
+MODULE_LICENSE("GPL");
+
+#define LENSL_EMERG      0
+#define LENSL_ALERT      1
+#define LENSL_CRIT       2
+#define LENSL_ERR        3
+#define LENSL_WARNING    4
+#define LENSL_NOTICE     5
+#define LENSL_INFO       6
+#define LENSL_DEBUG      7
+
+#define vdbg_printk_(a_dbg_level, format, arg...) \
+	do { if (dbg_level >= a_dbg_level) \
+		printk("<" #a_dbg_level ">" LENSL_MODULE_NAME ": " \
+			format, ## arg); \
+	} while (0)
+#define vdbg_printk(a_dbg_level, format, arg...) \
+	vdbg_printk_(a_dbg_level, format, ## arg)
+
+#define LENSL_HKEY_FILE LENSL_MODULE_NAME
+#define LENSL_DRVR_NAME LENSL_MODULE_NAME
+
+/* FIXME : we use "thinkpad_screen" for now to ensure compatibility with
+   the xf86-video-intel driver (it checks the name against a fixed list
+   of strings, see i830_lvds.c) but this is obviously suboptimal since
+   this string is usually used by thinkpad_acpi.c */
+#define LENSL_BACKLIGHT_NAME "thinkpad_screen"
+
+#define LENSL_HKEY_POLL_KTHREAD_NAME "klensl_hkeyd"
+#define LENSL_WORKQUEUE_NAME "klensl_wq"
+
+#define LENSL_EC0 "\\_SB.PCI0.SBRG.EC0"
+#define LENSL_HKEY LENSL_EC0 ".HKEY"
+#define LENSL_LCDD "\\_SB.PCI0.VGA.LCDD"
+
+/* parameters */
+
+static unsigned int dbg_level = LENSL_INFO;
+static int debug_ec = 0;
+static int control_backlight = 0;
+static int bluetooth_auto_enable = 1;
+module_param(debug_ec, bool, S_IRUGO);
+MODULE_PARM_DESC(debug_ec,
+	"Present EC debugging interface in procfs. WARNING: writing to the "
+	"EC can hang your system and possibly damage your hardware.");
+module_param(control_backlight, bool, S_IRUGO);
+MODULE_PARM_DESC(control_backlight,
+	"Control backlight brightness; can conflict with ACPI video driver");
+module_param_named(debug, dbg_level, uint, S_IRUGO);
+MODULE_PARM_DESC(debug,
+	"Set debug verbosity level (0 = nothing, 7 = everything)");
+module_param(bluetooth_auto_enable, bool, S_IRUGO);
+MODULE_PARM_DESC(bluetooth_auto_enable,
+	"Automatically enable bluetooth (if supported by hardware) when the "
+	"module is loaded");
+
+/* general */
+
+enum {
+	LENSL_RFK_BLUETOOTH_SW_ID = 0,
+	LENSL_RFK_WWAN_SW_ID,
+};
+
+static acpi_handle hkey_handle;
+static struct platform_device *lensl_pdev;
+
+static int parse_strtoul(const char *buf,
+		unsigned long max, unsigned long *value)
+{
+	char *endp;
+
+	while (*buf && isspace(*buf))
+		buf++;
+	*value = simple_strtoul(buf, &endp, 0);
+	while (*endp && isspace(*endp))
+		endp++;
+	if (*endp || *value > max)
+		return -EINVAL;
+
+	return 0;
+}
+
+static struct input_dev *hkey_inputdev;
+static struct workqueue_struct *lensl_wq;
+
+/*************************************************************************
+    bluetooth - copied nearly verbatim from thinkpad_acpi.c
+ *************************************************************************/
+
+enum {
+	/* ACPI GBDC/SBDC bits */
+	TP_ACPI_BLUETOOTH_HWPRESENT	= 0x01,	/* Bluetooth hw available */
+	TP_ACPI_BLUETOOTH_RADIOSSW	= 0x02,	/* Bluetooth radio enabled */
+	TP_ACPI_BLUETOOTH_UNK		= 0x04,	/* unknown function */
+};
+
+static struct rfkill *bluetooth_rfkill;
+static int bluetooth_present;
+static int bluetooth_pretend_blocked;
+
+static int lensl_get_acpi_int(acpi_handle handle, char *pathname, int *value)
+{
+	acpi_status status;
+	unsigned long long ullval;
+
+	if (!handle)
+		return -EINVAL;
+	status = acpi_evaluate_integer(handle, pathname, NULL, &ullval);
+	if (ACPI_FAILURE(status))
+		return -EIO;
+	*value = (int)ullval;
+	vdbg_printk(LENSL_DEBUG, "ACPI : %s == %d\n", pathname, *value);
+	return 0;
+}
+
+static int lensl_set_acpi_int(acpi_handle handle, char *pathname, int value)
+{
+	acpi_status status;
+	struct acpi_object_list params;
+	union acpi_object in_obj;
+
+	if (!handle)
+		return -EINVAL;
+	in_obj.integer.value = value;
+	in_obj.type = ACPI_TYPE_INTEGER;
+	params.count = 1;
+	params.pointer = &in_obj;
+	status = acpi_evaluate_object(handle, pathname, &params, NULL);
+	if (ACPI_FAILURE(status))
+		return -EIO;
+	vdbg_printk(LENSL_DEBUG, "ACPI : %s := %d\n", pathname, value);
+	return 0;
+}
+
+static inline int get_wlsw(int *value)
+{
+	return lensl_get_acpi_int(hkey_handle, "WLSW", value);
+}
+
+static inline int get_gbdc(int *value)
+{
+	return lensl_get_acpi_int(hkey_handle, "GBDC", value);
+}
+
+static inline int set_sbdc(int value)
+{
+	return lensl_set_acpi_int(hkey_handle, "SBDC", value);
+}
+
+static int bluetooth_get_radiosw(void)
+{
+	int value = 0;
+
+	if (!bluetooth_present)
+		return -ENODEV;
+
+	/* WLSW overrides bluetooth in firmware/hardware, reflect that */
+	if (bluetooth_pretend_blocked || (!get_wlsw(&value) && !value))
+		return RFKILL_STATE_HARD_BLOCKED;
+
+	if (get_gbdc(&value))
+		return -EIO;
+
+	return ((value & TP_ACPI_BLUETOOTH_RADIOSSW) != 0) ?
+		RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
+}
+
+static void bluetooth_update_rfk(void)
+{
+	int result;
+
+	if (!bluetooth_rfkill)
+		return;
+
+	result = bluetooth_get_radiosw();
+	if (result < 0)
+		return;
+	rfkill_force_state(bluetooth_rfkill, result);
+}
+
+static int bluetooth_set_radiosw(int radio_on, int update_rfk)
+{
+	int value;
+
+	if (!bluetooth_present)
+		return -ENODEV;
+
+	/* WLSW overrides bluetooth in firmware/hardware, but there is no
+	 * reason to risk weird behaviour. */
+	if (get_wlsw(&value) && !value && radio_on)
+		return -EPERM;
+
+	if (get_gbdc(&value))
+		return -EIO;
+	if (radio_on)
+		value |= TP_ACPI_BLUETOOTH_RADIOSSW;
+	else
+		value &= ~TP_ACPI_BLUETOOTH_RADIOSSW;
+	if (set_sbdc(value))
+		return -EIO;
+
+	if (update_rfk)
+		bluetooth_update_rfk();
+
+	return 0;
+}
+
+/*************************************************************************
+    bluetooth sysfs - copied nearly verbatim from thinkpad_acpi.c
+ *************************************************************************/
+
+static ssize_t bluetooth_enable_show(struct device *dev,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	int status;
+
+	status = bluetooth_get_radiosw();
+	if (status < 0)
+		return status;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n",
+			(status == RFKILL_STATE_UNBLOCKED) ? 1 : 0);
+}
+
+static ssize_t bluetooth_enable_store(struct device *dev,
+			    struct device_attribute *attr,
+			    const char *buf, size_t count)
+{
+	unsigned long t;
+	int res;
+
+	if (parse_strtoul(buf, 1, &t))
+		return -EINVAL;
+
+	res = bluetooth_set_radiosw(t, 1);
+
+	return (res) ? res : count;
+}
+
+static struct device_attribute dev_attr_bluetooth_enable =
+	__ATTR(bluetooth_enable, S_IWUSR | S_IRUGO,
+		bluetooth_enable_show, bluetooth_enable_store);
+
+static struct attribute *bluetooth_attributes[] = {
+	&dev_attr_bluetooth_enable.attr,
+	NULL
+};
+
+static const struct attribute_group bluetooth_attr_group = {
+	.attrs = bluetooth_attributes,
+};
+
+static int bluetooth_rfk_get(void *data, enum rfkill_state *state)
+{
+	int bts = bluetooth_get_radiosw();
+
+	if (bts < 0)
+		return bts;
+
+	*state = bts;
+	return 0;
+}
+
+static int bluetooth_rfk_set(void *data, enum rfkill_state state)
+{
+	return bluetooth_set_radiosw((state == RFKILL_STATE_UNBLOCKED), 0);
+}
+
+static int lensl_new_rfkill(const unsigned int id,
+			struct rfkill **rfk,
+			const enum rfkill_type rfktype,
+			const char *name,
+			int (*toggle_radio)(void *, enum rfkill_state),
+			int (*get_state)(void *, enum rfkill_state *))
+{
+	int res;
+	enum rfkill_state initial_state;
+
+	*rfk = rfkill_allocate(&lensl_pdev->dev, rfktype);
+	if (!*rfk) {
+		vdbg_printk(LENSL_ERR,
+			"Failed to allocate memory for rfkill class\n");
+		return -ENOMEM;
+	}
+
+	(*rfk)->name = name;
+	(*rfk)->get_state = get_state;
+	(*rfk)->toggle_radio = toggle_radio;
+
+	if (!get_state(NULL, &initial_state))
+		(*rfk)->state = initial_state;
+
+	res = rfkill_register(*rfk);
+	if (res < 0) {
+		vdbg_printk(LENSL_ERR,
+			"Failed to register %s rfkill switch: %d\n",
+			name, res);
+		rfkill_free(*rfk);
+		*rfk = NULL;
+		return res;
+	}
+
+	return 0;
+}
+
+static void bluetooth_exit(void)
+{
+	if (bluetooth_rfkill)
+		rfkill_unregister(bluetooth_rfkill);
+
+	sysfs_remove_group(&lensl_pdev->dev.kobj,
+			&bluetooth_attr_group);
+}
+
+static int bluetooth_init(void)
+{
+	int value, res;
+	bluetooth_present = 0;
+	if (!hkey_handle)
+		return -ENODEV;
+	if (get_gbdc(&value))
+		return -EIO;
+	if (!(value & TP_ACPI_BLUETOOTH_HWPRESENT))
+		return -ENODEV;
+	bluetooth_present = 1;
+
+	res = sysfs_create_group(&lensl_pdev->dev.kobj,
+				&bluetooth_attr_group);
+	if (res)
+		return res;
+
+	bluetooth_pretend_blocked = !bluetooth_auto_enable;
+	res = lensl_new_rfkill(LENSL_RFK_BLUETOOTH_SW_ID,
+				&bluetooth_rfkill,
+				RFKILL_TYPE_BLUETOOTH,
+				"lensl_bluetooth_sw",
+				bluetooth_rfk_set,
+				bluetooth_rfk_get);
+	bluetooth_pretend_blocked = 0;
+	if (res) {
+		bluetooth_exit();
+		return res;
+	}
+
+	return 0;
+}
+
+/*************************************************************************
+    backlight control - based on video.c
+ *************************************************************************/
+
+/* NB: the reason why this needs to be implemented here is that the SL series
+   uses the ACPI interface for controlling the backlight in a non-standard
+   manner. See http://bugzilla.kernel.org/show_bug.cgi?id=12249  */
+
+static acpi_handle lcdd_handle;
+static struct backlight_device *backlight;
+static struct lensl_vector {
+	int count;
+	int *values;
+} backlight_levels;
+
+static int get_bcl(struct lensl_vector *levels)
+{
+	int i, status;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *o, *obj;
+
+	if (!levels)
+		return -EINVAL;
+	if (levels->count) {
+		levels->count = 0;
+		kfree(levels->values);
+	}
+
+	/* _BCL returns an array sorted from high to low; the first two values
+	   are *not* special (non-standard behavior) */
+	status = acpi_evaluate_object(lcdd_handle, "_BCL", NULL, &buffer);
+	if (!ACPI_SUCCESS(status))
+		return status;
+	obj = (union acpi_object *)buffer.pointer;
+	if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
+		vdbg_printk(LENSL_ERR, "Invalid _BCL data\n");
+		status = -EFAULT;
+		goto out;
+	}
+
+	levels->count = obj->package.count;
+	if (!levels->count)
+		goto out;
+	levels->values = kmalloc(levels->count * sizeof(int), GFP_KERNEL);
+	if (!levels->values) {
+		vdbg_printk(LENSL_ERR,
+			"Failed to allocate memory for brightness levels\n");
+		status = -ENOMEM;
+		goto out;
+	}
+
+	for (i = 0; i < obj->package.count; i++) {
+		o = (union acpi_object *)&obj->package.elements[i];
+		if (o->type != ACPI_TYPE_INTEGER) {
+			vdbg_printk(LENSL_ERR, "Invalid brightness data\n");
+			goto err;
+		}
+		levels->values[i] = (int) o->integer.value;
+	}
+	goto out;
+
+err:
+	levels->count = 0;
+	kfree(levels->values);
+
+out:
+	kfree(buffer.pointer);
+
+	return status;
+}
+
+static inline int set_bcm(int level)
+{
+	/* standard behavior */
+	return lensl_set_acpi_int(lcdd_handle, "_BCM", level);
+}
+
+static inline int get_bqc(int *level)
+{
+	/* returns an index from the bottom into the _BCL package
+	   (non-standard behavior) */
+	return lensl_get_acpi_int(lcdd_handle, "_BQC", level);
+}
+
+/* backlight device sysfs support */
+static int lensl_bd_get_brightness(struct backlight_device *bd)
+{
+	int level = 0;
+
+	if (get_bqc(&level))
+		return 0;
+
+	return level;
+}
+
+static int lensl_bd_set_brightness_int(int request_level)
+{
+	int n;
+	n = backlight_levels.count - request_level - 1;
+	if (n >= 0 && n < backlight_levels.count)
+		return set_bcm(backlight_levels.values[n]);
+
+	return -EINVAL;
+}
+
+static int lensl_bd_set_brightness(struct backlight_device *bd)
+{
+	if (!bd)
+		return -EINVAL;
+
+	return lensl_bd_set_brightness_int(bd->props.brightness);
+}
+
+static struct backlight_ops lensl_backlight_ops = {
+	.get_brightness = lensl_bd_get_brightness,
+	.update_status  = lensl_bd_set_brightness,
+};
+
+static void backlight_exit(void)
+{
+	backlight_device_unregister(backlight);
+	backlight = NULL;
+	if (backlight_levels.count) {
+		kfree(backlight_levels.values);
+		backlight_levels.count = 0;
+	}
+}
+
+static int backlight_init(void)
+{
+	int status = 0;
+
+	lcdd_handle = NULL;
+	backlight = NULL;
+	backlight_levels.count = 0;
+	backlight_levels.values = NULL;
+
+	status = acpi_get_handle(NULL, LENSL_LCDD, &lcdd_handle);
+	if (ACPI_FAILURE(status)) {
+		vdbg_printk(LENSL_ERR,
+			"Failed to get ACPI handle for %s\n", LENSL_LCDD);
+		return -EIO;
+	}
+
+	status = get_bcl(&backlight_levels);
+	if (status || !backlight_levels.count)
+		goto err;
+
+	backlight = backlight_device_register(LENSL_BACKLIGHT_NAME,
+			NULL, NULL, &lensl_backlight_ops);
+	backlight->props.max_brightness = backlight_levels.count - 1;
+	backlight->props.brightness = lensl_bd_get_brightness(backlight);
+	vdbg_printk(LENSL_INFO, "Started backlight brightness control\n");
+	goto out;
+err:
+	if (backlight_levels.count) {
+		kfree(backlight_levels.values);
+		backlight_levels.count = 0;
+	}
+out:
+	return status;
+}
+
+/*************************************************************************
+    LEDs
+ *************************************************************************/
+
+#ifdef CONFIG_NEW_LEDS
+
+#define LENSL_LED_TV_OFF   0
+#define LENSL_LED_TV_ON    0x02
+#define LENSL_LED_TV_BLINK 0x01
+#define LENSL_LED_TV_DIM   0x100
+
+/* equivalent to the ThinkVantage LED on other ThinkPads */
+#define LENSL_LED_TV_NAME "lensl::lenovocare"
+
+struct {
+	struct led_classdev cdev;
+	enum led_brightness brightness;
+	int supported, new_code;
+	struct work_struct work;
+} led_tv;
+
+static inline int set_tvls(int code)
+{
+	return lensl_set_acpi_int(hkey_handle, "TVLS", code);
+}
+
+static void led_tv_worker(struct work_struct *work)
+{
+	if (!led_tv.supported)
+		return;
+	set_tvls(led_tv.new_code);
+	if (led_tv.new_code)
+		led_tv.brightness = LED_FULL;
+	else
+		led_tv.brightness = LED_OFF;
+}
+
+static void led_tv_brightness_set_sysfs(struct led_classdev *led_cdev,
+				enum led_brightness brightness)
+{
+	switch (brightness) {
+	case LED_OFF:
+		led_tv.new_code = LENSL_LED_TV_OFF;
+		break;
+	case LED_FULL:
+		led_tv.new_code = LENSL_LED_TV_ON;
+		break;
+	default:
+		return;
+	}
+	queue_work(lensl_wq, &led_tv.work);
+}
+
+static enum led_brightness led_tv_brightness_get_sysfs(
+					struct led_classdev *led_cdev)
+{
+	return led_tv.brightness;
+}
+
+static int led_tv_blink_set_sysfs(struct led_classdev *led_cdev,
+			unsigned long *delay_on, unsigned long *delay_off)
+{
+	if (*delay_on == 0 && *delay_off == 0) {
+		/* If we can choose the flash rate, use dimmed blinking --
+		   it looks better */
+		led_tv.new_code = LENSL_LED_TV_ON |
+			LENSL_LED_TV_BLINK | LENSL_LED_TV_DIM;
+		*delay_on = 2000;
+		*delay_off = 2000;
+	} else if (*delay_on + *delay_off == 4000) {
+		/* User wants dimmed blinking */
+		led_tv.new_code = LENSL_LED_TV_ON |
+			LENSL_LED_TV_BLINK | LENSL_LED_TV_DIM;
+	} else if (*delay_on == 7250 && *delay_off == 500) {
+		/* User wants standard blinking mode */
+		led_tv.new_code = LENSL_LED_TV_ON | LENSL_LED_TV_BLINK;
+	} else
+		return -EINVAL;
+	queue_work(lensl_wq, &led_tv.work);
+	return 0;
+}
+
+static void led_exit(void)
+{
+	if (led_tv.supported) {
+		led_classdev_unregister(&led_tv.cdev);
+		led_tv.supported = 0;
+		set_tvls(LENSL_LED_TV_OFF);
+	}
+}
+
+static int led_init(void)
+{
+	int res;
+
+	memset(&led_tv, 0, sizeof(led_tv));
+	led_tv.cdev.brightness_get = led_tv_brightness_get_sysfs;
+	led_tv.cdev.brightness_set = led_tv_brightness_set_sysfs;
+	led_tv.cdev.blink_set = led_tv_blink_set_sysfs;
+	led_tv.cdev.name = LENSL_LED_TV_NAME;
+	INIT_WORK(&led_tv.work, led_tv_worker);
+	set_tvls(LENSL_LED_TV_OFF);
+	res = led_classdev_register(&lensl_pdev->dev, &led_tv.cdev);
+	if (res) {
+		vdbg_printk(LENSL_WARNING, "Failed to register LED device\n");
+		return res;
+	}
+	led_tv.supported = 1;
+	return 0;
+}
+
+#else /* CONFIG_NEW_LEDS */
+
+static void led_exit(void)
+{
+}
+
+static int led_init(void)
+{
+	return -ENODEV;
+}
+
+#endif /* CONFIG_NEW_LEDS */
+
+/*************************************************************************
+    hotkeys
+ *************************************************************************/
+
+static int hkey_poll_hz = 5;
+static u8 hkey_ec_prev_offset;
+static struct mutex hkey_poll_mutex;
+static struct task_struct *hkey_poll_task;
+
+struct key_entry {
+	char type;
+	u8 scancode;
+	int keycode;
+};
+
+enum { KE_KEY, KE_END };
+
+static struct key_entry ec_keymap[] = {
+	/* Fn F2 */
+	{KE_KEY, 0x0B, KEY_COFFEE },
+	/* Fn F3 */
+	{KE_KEY, 0x0C, KEY_BATTERY },
+	/* Fn F4; dispatches an ACPI event */
+	{KE_KEY, 0x0D, /* KEY_SLEEP */ KEY_RESERVED },
+	/* Fn F5; FIXME: should this be KEY_BLUETOOTH? */
+	{KE_KEY, 0x0E, KEY_WLAN },
+	/* Fn F7; dispatches an ACPI event */
+	{KE_KEY, 0x10, /* KEY_SWITCHVIDEOMODE */ KEY_RESERVED },
+	/* Fn F8 - ultranav; FIXME: find some keycode that fits this properly */
+	{KE_KEY, 0x11, KEY_PROG1 },
+	/* Fn F9 */
+	{KE_KEY, 0x12, KEY_EJECTCD },
+	/* Fn F12 */
+	{KE_KEY, 0x15, KEY_SUSPEND },
+	{KE_KEY, 0x69, KEY_VOLUMEUP },
+	{KE_KEY, 0x6A, KEY_VOLUMEDOWN },
+	{KE_KEY, 0x6B, KEY_MUTE },
+	/* Fn Home; dispatches an ACPI event */
+	{KE_KEY, 0x6C, KEY_BRIGHTNESSDOWN /*KEY_RESERVED*/ },
+	/* Fn End; dispatches an ACPI event */
+	{KE_KEY, 0x6D, KEY_BRIGHTNESSUP /*KEY_RESERVED*/ },
+	/* Fn spacebar - zoom */
+	{KE_KEY, 0x71, KEY_ZOOM },
+	/* Lenovo Care key */
+	{KE_KEY, 0x80, KEY_VENDOR },
+	{KE_END, 0},
+};
+
+static int ec_scancode_to_keycode(u8 scancode)
+{
+	struct key_entry *key;
+
+	for (key = ec_keymap; key->type != KE_END; key++)
+		if (scancode == key->scancode)
+			return key->keycode;
+
+	return -EINVAL;
+}
+
+static int hkey_inputdev_getkeycode(struct input_dev *dev, int scancode,
+					int *keycode)
+{
+	int result;
+
+	if (!dev)
+		return -EINVAL;
+
+	result = ec_scancode_to_keycode(scancode);
+	if (result >= 0) {
+		*keycode = result;
+		return 0;
+	}
+	return result;
+}
+
+static int hkey_inputdev_setkeycode(struct input_dev *dev, int scancode,
+					int keycode)
+{
+	struct key_entry *key;
+
+	if (!dev)
+		return -EINVAL;
+
+	for (key = ec_keymap; key->type != KE_END; key++)
+		if (scancode == key->scancode) {
+			clear_bit(key->keycode, dev->keybit);
+			key->keycode = keycode;
+			set_bit(key->keycode, dev->keybit);
+			return 0;
+		}
+
+	return -EINVAL;
+}
+
+static int hkey_ec_get_offset(void)
+{
+	/* Hotkey events are stored in EC registers 0x0A .. 0x11
+	 * Address of last event is stored in EC registers 0x12 and
+	 * 0x14; if address is 0x01, last event is in register 0x0A;
+	 * if address is 0x07, last event is in register 0x10;
+	 * if address is 0x00, last event is in register 0x11 */
+
+	u8 offset;
+
+	if (ec_read(0x12, &offset))
+		return -EINVAL;
+	if (!offset)
+		offset = 8;
+	offset -= 1;
+	if (offset > 7)
+		return -EINVAL;
+	return offset;
+}
+
+static int hkey_poll_kthread(void *data)
+{
+	unsigned long t = 0;
+	int offset, level;
+	unsigned int keycode;
+	u8 scancode;
+
+	mutex_lock(&hkey_poll_mutex);
+
+	offset = hkey_ec_get_offset();
+	if (offset < 0) {
+		vdbg_printk(LENSL_WARNING,
+			"Failed to read hotkey register offset from EC\n");
+		hkey_ec_prev_offset = 0;
+	} else
+		hkey_ec_prev_offset = offset;
+
+	while (!kthread_should_stop() && hkey_poll_hz) {
+		if (t == 0)
+			t = 1000/hkey_poll_hz;
+		t = msleep_interruptible(t);
+		if (unlikely(kthread_should_stop()))
+			break;
+		try_to_freeze();
+		if (t > 0)
+			continue;
+		offset = hkey_ec_get_offset();
+		if (offset < 0) {
+			vdbg_printk(LENSL_WARNING,
+			   "Failed to read hotkey register offset from EC\n");
+			continue;
+		}
+		if (offset == hkey_ec_prev_offset)
+			continue;
+
+		if (ec_read(0x0A + offset, &scancode)) {
+			vdbg_printk(LENSL_WARNING,
+				"Failed to read hotkey code from EC\n");
+			continue;
+		}
+		keycode = ec_scancode_to_keycode(scancode);
+		vdbg_printk(LENSL_DEBUG,
+		   "Got hotkey keycode %d (scancode %d)\n", keycode, scancode);
+
+		/* Special handling for brightness keys. We do it here and not
+		   via an ACPI notifier in order to prevent possible conflicts
+		   with video.c */
+		if (keycode == KEY_BRIGHTNESSDOWN) {
+			if (control_backlight && backlight) {
+				level = lensl_bd_get_brightness(backlight);
+				if (0 <= --level)
+					lensl_bd_set_brightness_int(level);
+			} else
+				keycode = KEY_RESERVED;
+		} else if (keycode == KEY_BRIGHTNESSUP) {
+			if (control_backlight && backlight) {
+				level = lensl_bd_get_brightness(backlight);
+				if (backlight_levels.count > ++level)
+					lensl_bd_set_brightness_int(level);
+			} else
+				keycode = KEY_RESERVED;
+		}
+
+		if (keycode != KEY_RESERVED) {
+			input_report_key(hkey_inputdev, keycode, 1);
+			input_sync(hkey_inputdev);
+			input_report_key(hkey_inputdev, keycode, 0);
+			input_sync(hkey_inputdev);
+		}
+		hkey_ec_prev_offset = offset;
+	}
+
+	mutex_unlock(&hkey_poll_mutex);
+	return 0;
+}
+
+static void hkey_poll_start(void)
+{
+	hkey_ec_prev_offset = 0;
+	mutex_lock(&hkey_poll_mutex);
+	hkey_poll_task = kthread_run(hkey_poll_kthread,
+		NULL, LENSL_HKEY_POLL_KTHREAD_NAME);
+	if (IS_ERR(hkey_poll_task)) {
+		hkey_poll_task = NULL;
+		vdbg_printk(LENSL_ERR,
+			"Could not create kernel thread for hotkey polling\n");
+	}
+	mutex_unlock(&hkey_poll_mutex);
+}
+
+static void hkey_poll_stop(void)
+{
+	if (hkey_poll_task) {
+		if (frozen(hkey_poll_task) || freezing(hkey_poll_task))
+			thaw_process(hkey_poll_task);
+
+		kthread_stop(hkey_poll_task);
+		hkey_poll_task = NULL;
+		mutex_lock(&hkey_poll_mutex);
+		/* at this point, the thread did exit */
+		mutex_unlock(&hkey_poll_mutex);
+	}
+}
+
+static void hkey_inputdev_exit(void)
+{
+	if (hkey_inputdev)
+		input_unregister_device(hkey_inputdev);
+	hkey_inputdev = NULL;
+}
+
+static int hkey_inputdev_init(void)
+{
+	int result;
+	struct key_entry *key;
+
+	hkey_inputdev = input_allocate_device();
+	if (!hkey_inputdev) {
+		vdbg_printk(LENSL_ERR,
+			"Failed to allocate hotkey input device\n");
+		return -ENODEV;
+	}
+	hkey_inputdev->name = "Lenovo ThinkPad SL Series extra buttons";
+	hkey_inputdev->phys = LENSL_HKEY_FILE "/input0";
+	hkey_inputdev->uniq = LENSL_HKEY_FILE;
+	hkey_inputdev->id.bustype = BUS_HOST;
+	hkey_inputdev->id.vendor = PCI_VENDOR_ID_LENOVO;
+	hkey_inputdev->getkeycode = hkey_inputdev_getkeycode;
+	hkey_inputdev->setkeycode = hkey_inputdev_setkeycode;
+	set_bit(EV_KEY, hkey_inputdev->evbit);
+
+	for (key = ec_keymap; key->type != KE_END; key++)
+		set_bit(key->keycode, hkey_inputdev->keybit);
+
+	result = input_register_device(hkey_inputdev);
+	if (result) {
+		vdbg_printk(LENSL_ERR,
+			"Failed to register hotkey input device\n");
+		input_free_device(hkey_inputdev);
+		hkey_inputdev = NULL;
+		return -ENODEV;
+	}
+	return 0;
+}
+
+
+/*************************************************************************
+    procfs debugging interface
+ *************************************************************************/
+
+#define LENSL_PROC_EC "ec0"
+#define LENSL_PROC_DIRNAME LENSL_MODULE_NAME
+
+static struct proc_dir_entry *proc_dir;
+
+int lensl_ec_read_procmem(char *buf, char **start, off_t offset,
+		int count, int *eof, void *data)
+{
+	int err, len = 0;
+	u8 i, result;
+	/* note: ec_read at i = 255 locks up my SL300 hard. -AR */
+	for (i = 0; i < 255; i++) {
+		if (!(i % 16)) {
+			if (i)
+				len += sprintf(buf+len, "\n");
+			len += sprintf(buf+len, "%02X:", i);
+		}
+		err = ec_read(i, &result);
+		if (!err)
+			len += sprintf(buf+len, " %02X", result);
+		else
+			len += sprintf(buf+len, " **");
+	}
+	len += sprintf(buf+len, "\n");
+	*eof = 1;
+	return len;
+}
+
+/* we expect input in the format "%02X %02X", where the first number is
+   the EC register and the second is the value to be written */
+int lensl_ec_write_procmem(struct file *file, const char *buffer,
+				unsigned long count, void *data)
+{
+	char s[7];
+	unsigned int reg, val;
+
+	if (count > 6)
+		return -EINVAL;
+	memset(s, 0, 7);
+	if (copy_from_user(s, buffer, count))
+		return -EFAULT;
+	if (sscanf(s, "%02X %02X", &reg, &val) < 2)
+		return -EINVAL;
+	if (reg > 255 || val > 255)
+		return -EINVAL;
+	if (ec_write(reg, val))
+		return -EFAULT;
+	return count;
+}
+
+static void lenovo_sl_procfs_exit(void)
+{
+	if (proc_dir) {
+		remove_proc_entry(LENSL_PROC_EC, proc_dir);
+		remove_proc_entry(LENSL_PROC_DIRNAME, acpi_root_dir);
+	}
+}
+
+static int lenovo_sl_procfs_init(void)
+{
+	struct proc_dir_entry *proc_ec;
+
+	proc_dir = proc_mkdir(LENSL_PROC_DIRNAME, acpi_root_dir);
+	if (!proc_dir) {
+		vdbg_printk(LENSL_ERR,
+		   "Failed to create proc dir acpi/%s/\n", LENSL_PROC_DIRNAME);
+		return -ENODEV;
+	}
+	proc_dir->owner = THIS_MODULE;
+	proc_ec = create_proc_entry(LENSL_PROC_EC, 0600, proc_dir);
+	if (!proc_ec) {
+		vdbg_printk(LENSL_ERR,
+			"Failed to create proc entry acpi/%s/%s\n",
+			LENSL_PROC_DIRNAME, LENSL_PROC_EC);
+		return -ENODEV;
+	}
+	proc_ec->read_proc = lensl_ec_read_procmem;
+	proc_ec->write_proc = lensl_ec_write_procmem;
+
+	return 0;
+}
+
+/*************************************************************************
+    init/exit
+ *************************************************************************/
+
+static int __init lenovo_sl_laptop_init(void)
+{
+	int ret;
+	acpi_status status;
+
+	if (!acpi_video_backlight_support())
+		control_backlight = 1;
+
+	hkey_handle = NULL;
+
+	if (acpi_disabled)
+		return -ENODEV;
+
+	lensl_wq = create_singlethread_workqueue(LENSL_WORKQUEUE_NAME);
+	if (!lensl_wq) {
+		vdbg_printk(LENSL_ERR, "Failed to create a workqueue\n");
+		return -EFAULT;
+	}
+
+	status = acpi_get_handle(NULL, LENSL_HKEY, &hkey_handle);
+	if (ACPI_FAILURE(status)) {
+		vdbg_printk(LENSL_ERR,
+			"Failed to get ACPI handle for %s\n", LENSL_HKEY);
+		return -EIO;
+	}
+
+	lensl_pdev = platform_device_register_simple(LENSL_DRVR_NAME, -1,
+							NULL, 0);
+	if (IS_ERR(lensl_pdev)) {
+		ret = PTR_ERR(lensl_pdev);
+		lensl_pdev = NULL;
+		vdbg_printk(LENSL_ERR, "Failed to register platform device\n");
+		return ret;
+	}
+
+	ret = hkey_inputdev_init();
+	if (ret)
+		return -EIO;
+
+	bluetooth_init();
+	if (control_backlight)
+		backlight_init();
+
+	led_init();
+	mutex_init(&hkey_poll_mutex);
+	hkey_poll_start();
+
+	if (debug_ec)
+		lenovo_sl_procfs_init();
+
+	vdbg_printk(LENSL_INFO, "Loaded Lenovo ThinkPad SL Series driver\n");
+	return 0;
+}
+
+static void __exit lenovo_sl_laptop_exit(void)
+{
+	lenovo_sl_procfs_exit();
+	hkey_poll_stop();
+	led_exit();
+	backlight_exit();
+	bluetooth_exit();
+	hkey_inputdev_exit();
+	if (lensl_pdev)
+		platform_device_unregister(lensl_pdev);
+	destroy_workqueue(lensl_wq);
+	vdbg_printk(LENSL_INFO, "Unloaded Lenovo ThinkPad SL Series driver\n");
+}
+
+MODULE_ALIAS("dmi:bvnLENOVO:*:svnLENOVO:*:pvrThinkPad SL*:rvnLENOVO:*");
+
+module_init(lenovo_sl_laptop_init);
+module_exit(lenovo_sl_laptop_exit);