ideapad: add Lenovo IdeaPad Z570 support (part 2)

The patch adds support for Lenovo IdeaPad Z570 laptop. It makes all special
keys working, adds possibility to control fan like Windows does, controls
Touchpad Disabled LED, toggles touchpad state via keyboard controller and
corrects touchpad behavior on resume from suspend. It is new, modified
version of patch. Now it does not depend on psmouse and does not need patching
of input subsystem.

Signed-off-by: Maxim Mikityanskiy <[e-mail]>

This is part 2 for touchpad toggle

Signed-off-by: Ike Panhc <[e-mail]>
Signed-off-by: Matthew Garrett <[e-mail]>

drivers/platform/x86/Kconfig

···
 	tristate "Lenovo IdeaPad Laptop Extras"
 	depends on ACPI
 	depends on RFKILL && INPUT
+	depends on SERIO_I8042
 	select INPUT_SPARSEKMAP
 	help
 	  This is a driver for the rfkill switches on Lenovo IdeaPad netbooks.

drivers/platform/x86/ideapad-laptop.c

···
 #include <linux/fb.h>
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
+#include <linux/i8042.h>
 
 #define IDEAPAD_RFKILL_DEV_NUM	(3)
 
···
 	{ 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 },
 };
 
···
 };
 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 
+static void ideapad_sync_touchpad_state(struct acpi_device *adevice)
+{
+	struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
+	unsigned long value;
+
+	/* Without reading from EC touchpad LED doesn't switch state */
+	if (!read_ec_data(adevice->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 int __devinit ideapad_acpi_add(struct acpi_device *adevice)
 {
 	int ret, i;
···
 			priv->rfk[i] = NULL;
 	}
 	ideapad_sync_rfk_state(priv);
+	ideapad_sync_touchpad_state(adevice);
 
 	if (!acpi_video_backlight_support()) {
 		ret = ideapad_backlight_init(priv);
···
 			case 6:
 				ideapad_input_report(priv, vpc_bit);
 				break;
+			case 5:
+				ideapad_sync_touchpad_state(adevice);
+				break;
 			case 4:
 				ideapad_backlight_notify_brightness(priv);
 				break;
···
 	}
 }
 
+static int ideapad_acpi_resume(struct device *device)
+{
+	ideapad_sync_rfk_state(ideapad_priv);
+	ideapad_sync_touchpad_state(to_acpi_device(device));
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(ideapad_pm, NULL, ideapad_acpi_resume);
+
 static struct acpi_driver ideapad_acpi_driver = {
 	.name = "ideapad_acpi",
 	.class = "IdeaPad",
···
 	.ops.add = ideapad_acpi_add,
 	.ops.remove = ideapad_acpi_remove,
 	.ops.notify = ideapad_acpi_notify,
+	.drv.pm = &ideapad_pm,
 	.owner = THIS_MODULE,
 };