Initial import

1 files changed, 992 insertions, 0 deletions

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
new file mode 100644
index 000000000..cb7cd8d79
--- /dev/null
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -0,0 +1,992 @@
+/*
+ *  ideapad-laptop.c - Lenovo IdeaPad ACPI Extras
+ *
+ *  Copyright © 2010 Intel Corporation
+ *  Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
+ *
+ *  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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/acpi.h>
+#include <linux/rfkill.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/backlight.h>
+#include <linux/fb.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/i8042.h>
+#include <linux/dmi.h>
+#include <linux/device.h>
+
+#define IDEAPAD_RFKILL_DEV_NUM	(3)
+
+#define CFG_BT_BIT	(16)
+#define CFG_3G_BIT	(17)
+#define CFG_WIFI_BIT	(18)
+#define CFG_CAMERA_BIT	(19)
+
+enum {
+	VPCCMD_R_VPC1 = 0x10,
+	VPCCMD_R_BL_MAX,
+	VPCCMD_R_BL,
+	VPCCMD_W_BL,
+	VPCCMD_R_WIFI,
+	VPCCMD_W_WIFI,
+	VPCCMD_R_BT,
+	VPCCMD_W_BT,
+	VPCCMD_R_BL_POWER,
+	VPCCMD_R_NOVO,
+	VPCCMD_R_VPC2,
+	VPCCMD_R_TOUCHPAD,
+	VPCCMD_W_TOUCHPAD,
+	VPCCMD_R_CAMERA,
+	VPCCMD_W_CAMERA,
+	VPCCMD_R_3G,
+	VPCCMD_W_3G,
+	VPCCMD_R_ODD, /* 0x21 */
+	VPCCMD_W_FAN,
+	VPCCMD_R_RF,
+	VPCCMD_W_RF,
+	VPCCMD_R_FAN = 0x2B,
+	VPCCMD_R_SPECIAL_BUTTONS = 0x31,
+	VPCCMD_W_BL_POWER = 0x33,
+};
+
+struct ideapad_rfk_priv {
+	int dev;
+	struct ideapad_private *priv;
+};
+
+struct ideapad_private {
+	struct acpi_device *adev;
+	struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
+	struct ideapad_rfk_priv rfk_priv[IDEAPAD_RFKILL_DEV_NUM];
+	struct platform_device *platform_device;
+	struct input_dev *inputdev;
+	struct backlight_device *blightdev;
+	struct dentry *debug;
+	unsigned long cfg;
+	bool has_hw_rfkill_switch;
+};
+
+static bool no_bt_rfkill;
+module_param(no_bt_rfkill, bool, 0444);
+MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
+
+/*
+ * ACPI Helpers
+ */
+#define IDEAPAD_EC_TIMEOUT (100) /* in ms */
+
+static int read_method_int(acpi_handle handle, const char *method, int *val)
+{
+	acpi_status status;
+	unsigned long long result;
+
+	status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
+	if (ACPI_FAILURE(status)) {
+		*val = -1;
+		return -1;
+	} else {
+		*val = result;
+		return 0;
+	}
+}
+
+static int method_vpcr(acpi_handle handle, int cmd, int *ret)
+{
+	acpi_status status;
+	unsigned long long result;
+	struct acpi_object_list params;
+	union acpi_object in_obj;
+
+	params.count = 1;
+	params.pointer = &in_obj;
+	in_obj.type = ACPI_TYPE_INTEGER;
+	in_obj.integer.value = cmd;
+
+	status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
+
+	if (ACPI_FAILURE(status)) {
+		*ret = -1;
+		return -1;
+	} else {
+		*ret = result;
+		return 0;
+	}
+}
+
+static int method_vpcw(acpi_handle handle, int cmd, int data)
+{
+	struct acpi_object_list params;
+	union acpi_object in_obj[2];
+	acpi_status status;
+
+	params.count = 2;
+	params.pointer = in_obj;
+	in_obj[0].type = ACPI_TYPE_INTEGER;
+	in_obj[0].integer.value = cmd;
+	in_obj[1].type = ACPI_TYPE_INTEGER;
+	in_obj[1].integer.value = data;
+
+	status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
+	if (status != AE_OK)
+		return -1;
+	return 0;
+}
+
+static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
+{
+	int val;
+	unsigned long int end_jiffies;
+
+	if (method_vpcw(handle, 1, cmd))
+		return -1;
+
+	for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
+	     time_before(jiffies, end_jiffies);) {
+		schedule();
+		if (method_vpcr(handle, 1, &val))
+			return -1;
+		if (val == 0) {
+			if (method_vpcr(handle, 0, &val))
+				return -1;
+			*data = val;
+			return 0;
+		}
+	}
+	pr_err("timeout in read_ec_cmd\n");
+	return -1;
+}
+
+static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
+{
+	int val;
+	unsigned long int end_jiffies;
+
+	if (method_vpcw(handle, 0, data))
+		return -1;
+	if (method_vpcw(handle, 1, cmd))
+		return -1;
+
+	for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
+	     time_before(jiffies, end_jiffies);) {
+		schedule();
+		if (method_vpcr(handle, 1, &val))
+			return -1;
+		if (val == 0)
+			return 0;
+	}
+	pr_err("timeout in write_ec_cmd\n");
+	return -1;
+}
+
+/*
+ * debugfs
+ */
+static int debugfs_status_show(struct seq_file *s, void *data)
+{
+	struct ideapad_private *priv = s->private;
+	unsigned long value;
+
+	if (!priv)
+		return -EINVAL;
+
+	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &value))
+		seq_printf(s, "Backlight max:\t%lu\n", value);
+	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL, &value))
+		seq_printf(s, "Backlight now:\t%lu\n", value);
+	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &value))
+		seq_printf(s, "BL power value:\t%s\n", value ? "On" : "Off");
+	seq_printf(s, "=====================\n");
+
+	if (!read_ec_data(priv->adev->handle, VPCCMD_R_RF, &value))
+		seq_printf(s, "Radio status:\t%s(%lu)\n",
+			   value ? "On" : "Off", value);
+	if (!read_ec_data(priv->adev->handle, VPCCMD_R_WIFI, &value))
+		seq_printf(s, "Wifi status:\t%s(%lu)\n",
+			   value ? "On" : "Off", value);
+	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BT, &value))
+		seq_printf(s, "BT status:\t%s(%lu)\n",
+			   value ? "On" : "Off", value);
+	if (!read_ec_data(priv->adev->handle, VPCCMD_R_3G, &value))
+		seq_printf(s, "3G status:\t%s(%lu)\n",
+			   value ? "On" : "Off", value);
+	seq_printf(s, "=====================\n");
+
+	if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value))
+		seq_printf(s, "Touchpad status:%s(%lu)\n",
+			   value ? "On" : "Off", value);
+	if (!read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &value))
+		seq_printf(s, "Camera status:\t%s(%lu)\n",
+			   value ? "On" : "Off", value);
+
+	return 0;
+}
+
+static int debugfs_status_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, debugfs_status_show, inode->i_private);
+}
+
+static const struct file_operations debugfs_status_fops = {
+	.owner = THIS_MODULE,
+	.open = debugfs_status_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static int debugfs_cfg_show(struct seq_file *s, void *data)
+{
+	struct ideapad_private *priv = s->private;
+
+	if (!priv) {
+		seq_printf(s, "cfg: N/A\n");
+	} else {
+		seq_printf(s, "cfg: 0x%.8lX\n\nCapability: ",
+			   priv->cfg);
+		if (test_bit(CFG_BT_BIT, &priv->cfg))
+			seq_printf(s, "Bluetooth ");
+		if (test_bit(CFG_3G_BIT, &priv->cfg))
+			seq_printf(s, "3G ");
+		if (test_bit(CFG_WIFI_BIT, &priv->cfg))
+			seq_printf(s, "Wireless ");
+		if (test_bit(CFG_CAMERA_BIT, &priv->cfg))
+			seq_printf(s, "Camera ");
+		seq_printf(s, "\nGraphic: ");
+		switch ((priv->cfg)&0x700) {
+		case 0x100:
+			seq_printf(s, "Intel");
+			break;
+		case 0x200:
+			seq_printf(s, "ATI");
+			break;
+		case 0x300:
+			seq_printf(s, "Nvidia");
+			break;
+		case 0x400:
+			seq_printf(s, "Intel and ATI");
+			break;
+		case 0x500:
+			seq_printf(s, "Intel and Nvidia");
+			break;
+		}
+		seq_printf(s, "\n");
+	}
+	return 0;
+}
+
+static int debugfs_cfg_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, debugfs_cfg_show, inode->i_private);
+}
+
+static const struct file_operations debugfs_cfg_fops = {
+	.owner = THIS_MODULE,
+	.open = debugfs_cfg_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static int ideapad_debugfs_init(struct ideapad_private *priv)
+{
+	struct dentry *node;
+
+	priv->debug = debugfs_create_dir("ideapad", NULL);
+	if (priv->debug == NULL) {
+		pr_err("failed to create debugfs directory");
+		goto errout;
+	}
+
+	node = debugfs_create_file("cfg", S_IRUGO, priv->debug, priv,
+				   &debugfs_cfg_fops);
+	if (!node) {
+		pr_err("failed to create cfg in debugfs");
+		goto errout;
+	}
+
+	node = debugfs_create_file("status", S_IRUGO, priv->debug, priv,
+				   &debugfs_status_fops);
+	if (!node) {
+		pr_err("failed to create status in debugfs");
+		goto errout;
+	}
+
+	return 0;
+
+errout:
+	return -ENOMEM;
+}
+
+static void ideapad_debugfs_exit(struct ideapad_private *priv)
+{
+	debugfs_remove_recursive(priv->debug);
+	priv->debug = NULL;
+}
+
+/*
+ * sysfs
+ */
+static ssize_t show_ideapad_cam(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	unsigned long result;
+	struct ideapad_private *priv = dev_get_drvdata(dev);
+
+	if (read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &result))
+		return sprintf(buf, "-1\n");
+	return sprintf(buf, "%lu\n", result);
+}
+
+static ssize_t store_ideapad_cam(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t count)
+{
+	int ret, state;
+	struct ideapad_private *priv = dev_get_drvdata(dev);
+
+	if (!count)
+		return 0;
+	if (sscanf(buf, "%i", &state) != 1)
+		return -EINVAL;
+	ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_CAMERA, state);
+	if (ret < 0)
+		return -EIO;
+	return count;
+}
+
+static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
+
+static ssize_t show_ideapad_fan(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	unsigned long result;
+	struct ideapad_private *priv = dev_get_drvdata(dev);
+
+	if (read_ec_data(priv->adev->handle, VPCCMD_R_FAN, &result))
+		return sprintf(buf, "-1\n");
+	return sprintf(buf, "%lu\n", result);
+}
+
+static ssize_t store_ideapad_fan(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t count)
+{
+	int ret, state;
+	struct ideapad_private *priv = dev_get_drvdata(dev);
+
+	if (!count)
+		return 0;
+	if (sscanf(buf, "%i", &state) != 1)
+		return -EINVAL;
+	if (state < 0 || state > 4 || state == 3)
+		return -EINVAL;
+	ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_FAN, state);
+	if (ret < 0)
+		return -EIO;
+	return count;
+}
+
+static DEVICE_ATTR(fan_mode, 0644, show_ideapad_fan, store_ideapad_fan);
+
+static struct attribute *ideapad_attributes[] = {
+	&dev_attr_camera_power.attr,
+	&dev_attr_fan_mode.attr,
+	NULL
+};
+
+static umode_t ideapad_is_visible(struct kobject *kobj,
+				 struct attribute *attr,
+				 int idx)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct ideapad_private *priv = dev_get_drvdata(dev);
+	bool supported;
+
+	if (attr == &dev_attr_camera_power.attr)
+		supported = test_bit(CFG_CAMERA_BIT, &(priv->cfg));
+	else if (attr == &dev_attr_fan_mode.attr) {
+		unsigned long value;
+		supported = !read_ec_data(priv->adev->handle, VPCCMD_R_FAN,
+					  &value);
+	} else
+		supported = true;
+
+	return supported ? attr->mode : 0;
+}
+
+static const struct attribute_group ideapad_attribute_group = {
+	.is_visible = ideapad_is_visible,
+	.attrs = ideapad_attributes
+};
+
+/*
+ * Rfkill
+ */
+struct ideapad_rfk_data {
+	char *name;
+	int cfgbit;
+	int opcode;
+	int type;
+};
+
+static const struct ideapad_rfk_data ideapad_rfk_data[] = {
+	{ "ideapad_wlan",    CFG_WIFI_BIT, VPCCMD_W_WIFI, RFKILL_TYPE_WLAN },
+	{ "ideapad_bluetooth", CFG_BT_BIT, VPCCMD_W_BT, RFKILL_TYPE_BLUETOOTH },
+	{ "ideapad_3g",        CFG_3G_BIT, VPCCMD_W_3G, RFKILL_TYPE_WWAN },
+};
+
+static int ideapad_rfk_set(void *data, bool blocked)
+{
+	struct ideapad_rfk_priv *priv = data;
+	int opcode = ideapad_rfk_data[priv->dev].opcode;
+
+	return write_ec_cmd(priv->priv->adev->handle, opcode, !blocked);
+}
+
+static struct rfkill_ops ideapad_rfk_ops = {
+	.set_block = ideapad_rfk_set,
+};
+
+static void ideapad_sync_rfk_state(struct ideapad_private *priv)
+{
+	unsigned long hw_blocked = 0;
+	int i;
+
+	if (priv->has_hw_rfkill_switch) {
+		if (read_ec_data(priv->adev->handle, VPCCMD_R_RF, &hw_blocked))
+			return;
+		hw_blocked = !hw_blocked;
+	}
+
+	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
+		if (priv->rfk[i])
+			rfkill_set_hw_state(priv->rfk[i], hw_blocked);
+}
+
+static int ideapad_register_rfkill(struct ideapad_private *priv, int dev)
+{
+	int ret;
+	unsigned long sw_blocked;
+
+	if (no_bt_rfkill &&
+	    (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
+		/* Force to enable bluetooth when no_bt_rfkill=1 */
+		write_ec_cmd(priv->adev->handle,
+			     ideapad_rfk_data[dev].opcode, 1);
+		return 0;
+	}
+	priv->rfk_priv[dev].dev = dev;
+	priv->rfk_priv[dev].priv = priv;
+
+	priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name,
+				      &priv->platform_device->dev,
+				      ideapad_rfk_data[dev].type,
+				      &ideapad_rfk_ops,
+				      &priv->rfk_priv[dev]);
+	if (!priv->rfk[dev])
+		return -ENOMEM;
+
+	if (read_ec_data(priv->adev->handle, ideapad_rfk_data[dev].opcode-1,
+			 &sw_blocked)) {
+		rfkill_init_sw_state(priv->rfk[dev], 0);
+	} else {
+		sw_blocked = !sw_blocked;
+		rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
+	}
+
+	ret = rfkill_register(priv->rfk[dev]);
+	if (ret) {
+		rfkill_destroy(priv->rfk[dev]);
+		return ret;
+	}
+	return 0;
+}
+
+static void ideapad_unregister_rfkill(struct ideapad_private *priv, int dev)
+{
+	if (!priv->rfk[dev])
+		return;
+
+	rfkill_unregister(priv->rfk[dev]);
+	rfkill_destroy(priv->rfk[dev]);
+}
+
+/*
+ * Platform device
+ */
+static int ideapad_sysfs_init(struct ideapad_private *priv)
+{
+	return sysfs_create_group(&priv->platform_device->dev.kobj,
+				    &ideapad_attribute_group);
+}
+
+static void ideapad_sysfs_exit(struct ideapad_private *priv)
+{
+	sysfs_remove_group(&priv->platform_device->dev.kobj,
+			   &ideapad_attribute_group);
+}
+
+/*
+ * input device
+ */
+static const struct key_entry ideapad_keymap[] = {
+	{ KE_KEY, 6,  { KEY_SWITCHVIDEOMODE } },
+	{ KE_KEY, 7,  { KEY_CAMERA } },
+	{ KE_KEY, 11, { KEY_F16 } },
+	{ KE_KEY, 13, { KEY_WLAN } },
+	{ KE_KEY, 16, { KEY_PROG1 } },
+	{ KE_KEY, 17, { KEY_PROG2 } },
+	{ KE_KEY, 64, { KEY_PROG3 } },
+	{ KE_KEY, 65, { KEY_PROG4 } },
+	{ KE_KEY, 66, { KEY_TOUCHPAD_OFF } },
+	{ KE_KEY, 67, { KEY_TOUCHPAD_ON } },
+	{ KE_END, 0 },
+};
+
+static int ideapad_input_init(struct ideapad_private *priv)
+{
+	struct input_dev *inputdev;
+	int error;
+
+	inputdev = input_allocate_device();
+	if (!inputdev)
+		return -ENOMEM;
+
+	inputdev->name = "Ideapad extra buttons";
+	inputdev->phys = "ideapad/input0";
+	inputdev->id.bustype = BUS_HOST;
+	inputdev->dev.parent = &priv->platform_device->dev;
+
+	error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
+	if (error) {
+		pr_err("Unable to setup input device keymap\n");
+		goto err_free_dev;
+	}
+
+	error = input_register_device(inputdev);
+	if (error) {
+		pr_err("Unable to register input device\n");
+		goto err_free_keymap;
+	}
+
+	priv->inputdev = inputdev;
+	return 0;
+
+err_free_keymap:
+	sparse_keymap_free(inputdev);
+err_free_dev:
+	input_free_device(inputdev);
+	return error;
+}
+
+static void ideapad_input_exit(struct ideapad_private *priv)
+{
+	sparse_keymap_free(priv->inputdev);
+	input_unregister_device(priv->inputdev);
+	priv->inputdev = NULL;
+}
+
+static void ideapad_input_report(struct ideapad_private *priv,
+				 unsigned long scancode)
+{
+	sparse_keymap_report_event(priv->inputdev, scancode, 1, true);
+}
+
+static void ideapad_input_novokey(struct ideapad_private *priv)
+{
+	unsigned long long_pressed;
+
+	if (read_ec_data(priv->adev->handle, VPCCMD_R_NOVO, &long_pressed))
+		return;
+	if (long_pressed)
+		ideapad_input_report(priv, 17);
+	else
+		ideapad_input_report(priv, 16);
+}
+
+static void ideapad_check_special_buttons(struct ideapad_private *priv)
+{
+	unsigned long bit, value;
+
+	read_ec_data(priv->adev->handle, VPCCMD_R_SPECIAL_BUTTONS, &value);
+
+	for (bit = 0; bit < 16; bit++) {
+		if (test_bit(bit, &value)) {
+			switch (bit) {
+			case 0:	/* Z580 */
+			case 6:	/* Z570 */
+				/* Thermal Management button */
+				ideapad_input_report(priv, 65);
+				break;
+			case 1:
+				/* OneKey Theater button */
+				ideapad_input_report(priv, 64);
+				break;
+			default:
+				pr_info("Unknown special button: %lu\n", bit);
+				break;
+			}
+		}
+	}
+}
+
+/*
+ * backlight
+ */
+static int ideapad_backlight_get_brightness(struct backlight_device *blightdev)
+{
+	struct ideapad_private *priv = bl_get_data(blightdev);
+	unsigned long now;
+
+	if (!priv)
+		return -EINVAL;
+
+	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now))
+		return -EIO;
+	return now;
+}
+
+static int ideapad_backlight_update_status(struct backlight_device *blightdev)
+{
+	struct ideapad_private *priv = bl_get_data(blightdev);
+
+	if (!priv)
+		return -EINVAL;
+
+	if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL,
+			 blightdev->props.brightness))
+		return -EIO;
+	if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL_POWER,
+			 blightdev->props.power == FB_BLANK_POWERDOWN ? 0 : 1))
+		return -EIO;
+
+	return 0;
+}
+
+static const struct backlight_ops ideapad_backlight_ops = {
+	.get_brightness = ideapad_backlight_get_brightness,
+	.update_status = ideapad_backlight_update_status,
+};
+
+static int ideapad_backlight_init(struct ideapad_private *priv)
+{
+	struct backlight_device *blightdev;
+	struct backlight_properties props;
+	unsigned long max, now, power;
+
+	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &max))
+		return -EIO;
+	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now))
+		return -EIO;
+	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power))
+		return -EIO;
+
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.max_brightness = max;
+	props.type = BACKLIGHT_PLATFORM;
+	blightdev = backlight_device_register("ideapad",
+					      &priv->platform_device->dev,
+					      priv,
+					      &ideapad_backlight_ops,
+					      &props);
+	if (IS_ERR(blightdev)) {
+		pr_err("Could not register backlight device\n");
+		return PTR_ERR(blightdev);
+	}
+
+	priv->blightdev = blightdev;
+	blightdev->props.brightness = now;
+	blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
+	backlight_update_status(blightdev);
+
+	return 0;
+}
+
+static void ideapad_backlight_exit(struct ideapad_private *priv)
+{
+	backlight_device_unregister(priv->blightdev);
+	priv->blightdev = NULL;
+}
+
+static void ideapad_backlight_notify_power(struct ideapad_private *priv)
+{
+	unsigned long power;
+	struct backlight_device *blightdev = priv->blightdev;
+
+	if (!blightdev)
+		return;
+	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power))
+		return;
+	blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
+}
+
+static void ideapad_backlight_notify_brightness(struct ideapad_private *priv)
+{
+	unsigned long now;
+
+	/* if we control brightness via acpi video driver */
+	if (priv->blightdev == NULL) {
+		read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now);
+		return;
+	}
+
+	backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY);
+}
+
+/*
+ * module init/exit
+ */
+static void ideapad_sync_touchpad_state(struct ideapad_private *priv)
+{
+	unsigned long value;
+
+	/* Without reading from EC touchpad LED doesn't switch state */
+	if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value)) {
+		/* Some IdeaPads don't really turn off touchpad - they only
+		 * switch the LED state. We (de)activate KBC AUX port to turn
+		 * touchpad off and on. We send KEY_TOUCHPAD_OFF and
+		 * KEY_TOUCHPAD_ON to not to get out of sync with LED */
+		unsigned char param;
+		i8042_command(&param, value ? I8042_CMD_AUX_ENABLE :
+			      I8042_CMD_AUX_DISABLE);
+		ideapad_input_report(priv, value ? 67 : 66);
+	}
+}
+
+static void ideapad_acpi_notify(acpi_handle handle, u32 event, void *data)
+{
+	struct ideapad_private *priv = data;
+	unsigned long vpc1, vpc2, vpc_bit;
+
+	if (read_ec_data(handle, VPCCMD_R_VPC1, &vpc1))
+		return;
+	if (read_ec_data(handle, VPCCMD_R_VPC2, &vpc2))
+		return;
+
+	vpc1 = (vpc2 << 8) | vpc1;
+	for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
+		if (test_bit(vpc_bit, &vpc1)) {
+			switch (vpc_bit) {
+			case 9:
+				ideapad_sync_rfk_state(priv);
+				break;
+			case 13:
+			case 11:
+			case 7:
+			case 6:
+				ideapad_input_report(priv, vpc_bit);
+				break;
+			case 5:
+				ideapad_sync_touchpad_state(priv);
+				break;
+			case 4:
+				ideapad_backlight_notify_brightness(priv);
+				break;
+			case 3:
+				ideapad_input_novokey(priv);
+				break;
+			case 2:
+				ideapad_backlight_notify_power(priv);
+				break;
+			case 0:
+				ideapad_check_special_buttons(priv);
+				break;
+			default:
+				pr_info("Unknown event: %lu\n", vpc_bit);
+			}
+		}
+	}
+}
+
+/*
+ * Some ideapads don't have a hardware rfkill switch, reading VPCCMD_R_RF
+ * always results in 0 on these models, causing ideapad_laptop to wrongly
+ * report all radios as hardware-blocked.
+ */
+static const struct dmi_system_id no_hw_rfkill_list[] = {
+	{
+		.ident = "Lenovo G40-30",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo G40-30"),
+		},
+	},
+	{
+		.ident = "Lenovo G50-30",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo G50-30"),
+		},
+	},
+	{
+		.ident = "Lenovo Yoga 2 11 / 13 / Pro",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2"),
+		},
+	},
+	{
+		.ident = "Lenovo Yoga 3 Pro 1370",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 3 Pro-1370"),
+		},
+	},
+	{}
+};
+
+static int ideapad_acpi_add(struct platform_device *pdev)
+{
+	int ret, i;
+	int cfg;
+	struct ideapad_private *priv;
+	struct acpi_device *adev;
+
+	ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
+	if (ret)
+		return -ENODEV;
+
+	if (read_method_int(adev->handle, "_CFG", &cfg))
+		return -ENODEV;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	dev_set_drvdata(&pdev->dev, priv);
+	priv->cfg = cfg;
+	priv->adev = adev;
+	priv->platform_device = pdev;
+	priv->has_hw_rfkill_switch = !dmi_check_system(no_hw_rfkill_list);
+
+	ret = ideapad_sysfs_init(priv);
+	if (ret)
+		return ret;
+
+	ret = ideapad_debugfs_init(priv);
+	if (ret)
+		goto debugfs_failed;
+
+	ret = ideapad_input_init(priv);
+	if (ret)
+		goto input_failed;
+
+	/*
+	 * On some models without a hw-switch (the yoga 2 13 at least)
+	 * VPCCMD_W_RF must be explicitly set to 1 for the wifi to work.
+	 */
+	if (!priv->has_hw_rfkill_switch)
+		write_ec_cmd(priv->adev->handle, VPCCMD_W_RF, 1);
+
+	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
+		if (test_bit(ideapad_rfk_data[i].cfgbit, &priv->cfg))
+			ideapad_register_rfkill(priv, i);
+
+	ideapad_sync_rfk_state(priv);
+	ideapad_sync_touchpad_state(priv);
+
+	if (!acpi_video_backlight_support()) {
+		ret = ideapad_backlight_init(priv);
+		if (ret && ret != -ENODEV)
+			goto backlight_failed;
+	}
+	ret = acpi_install_notify_handler(adev->handle,
+		ACPI_DEVICE_NOTIFY, ideapad_acpi_notify, priv);
+	if (ret)
+		goto notification_failed;
+
+	return 0;
+notification_failed:
+	ideapad_backlight_exit(priv);
+backlight_failed:
+	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
+		ideapad_unregister_rfkill(priv, i);
+	ideapad_input_exit(priv);
+input_failed:
+	ideapad_debugfs_exit(priv);
+debugfs_failed:
+	ideapad_sysfs_exit(priv);
+	return ret;
+}
+
+static int ideapad_acpi_remove(struct platform_device *pdev)
+{
+	struct ideapad_private *priv = dev_get_drvdata(&pdev->dev);
+	int i;
+
+	acpi_remove_notify_handler(priv->adev->handle,
+		ACPI_DEVICE_NOTIFY, ideapad_acpi_notify);
+	ideapad_backlight_exit(priv);
+	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
+		ideapad_unregister_rfkill(priv, i);
+	ideapad_input_exit(priv);
+	ideapad_debugfs_exit(priv);
+	ideapad_sysfs_exit(priv);
+	dev_set_drvdata(&pdev->dev, NULL);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ideapad_acpi_resume(struct device *device)
+{
+	struct ideapad_private *priv;
+
+	if (!device)
+		return -EINVAL;
+	priv = dev_get_drvdata(device);
+
+	ideapad_sync_rfk_state(priv);
+	ideapad_sync_touchpad_state(priv);
+	return 0;
+}
+#endif
+static SIMPLE_DEV_PM_OPS(ideapad_pm, NULL, ideapad_acpi_resume);
+
+static const struct acpi_device_id ideapad_device_ids[] = {
+	{ "VPC2004", 0},
+	{ "", 0},
+};
+MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
+
+static struct platform_driver ideapad_acpi_driver = {
+	.probe = ideapad_acpi_add,
+	.remove = ideapad_acpi_remove,
+	.driver = {
+		.name   = "ideapad_acpi",
+		.pm     = &ideapad_pm,
+		.acpi_match_table = ACPI_PTR(ideapad_device_ids),
+	},
+};
+
+module_platform_driver(ideapad_acpi_driver);
+
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("IdeaPad ACPI Extras");
+MODULE_LICENSE("GPL");