1 files changed, 400 insertions, 0 deletions
diff --git a/drivers/platform/x86/topstar-laptop.c b/drivers/platform/x86/topstar-laptop.c
new file mode 100644
index 000000000..6d18fbf87
--- /dev/null
+++ b/drivers/platform/x86/topstar-laptop.c
@@ -0,0 +1,400 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Topstar Laptop ACPI Extras driver
+ *
+ * Copyright (c) 2009 Herton Ronaldo Krzesinski <herton@mandriva.com.br>
+ * Copyright (c) 2018 Guillaume Douézan-Grard
+ *
+ * Implementation inspired by existing x86 platform drivers, in special
+ * asus/eepc/fujitsu-laptop, thanks to their authors.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/dmi.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+
+#define TOPSTAR_LAPTOP_CLASS "topstar"
+
+struct topstar_laptop {
+	struct acpi_device *device;
+	struct platform_device *platform;
+	struct input_dev *input;
+	struct led_classdev led;
+};
+
+/*
+ * LED
+ */
+
+static enum led_brightness topstar_led_get(struct led_classdev *led)
+{
+	return led->brightness;
+}
+
+static int topstar_led_set(struct led_classdev *led,
+		enum led_brightness state)
+{
+	struct topstar_laptop *topstar = container_of(led,
+			struct topstar_laptop, led);
+
+	struct acpi_object_list params;
+	union acpi_object in_obj;
+	unsigned long long int ret;
+	acpi_status status;
+
+	params.count = 1;
+	params.pointer = &in_obj;
+	in_obj.type = ACPI_TYPE_INTEGER;
+	in_obj.integer.value = 0x83;
+
+	/*
+	 * Topstar ACPI returns 0x30001 when the LED is ON and 0x30000 when it
+	 * is OFF.
+	 */
+	status = acpi_evaluate_integer(topstar->device->handle,
+			"GETX", &params, &ret);
+	if (ACPI_FAILURE(status))
+		return -1;
+
+	/*
+	 * FNCX(0x83) toggles the LED (more precisely, it is supposed to
+	 * act as an hardware switch and disconnect the WLAN adapter but
+	 * it seems to be faulty on some models like the Topstar U931
+	 * Notebook).
+	 */
+	if ((ret == 0x30001 && state == LED_OFF)
+			|| (ret == 0x30000 && state != LED_OFF)) {
+		status = acpi_execute_simple_method(topstar->device->handle,
+				"FNCX", 0x83);
+		if (ACPI_FAILURE(status))
+			return -1;
+	}
+
+	return 0;
+}
+
+static int topstar_led_init(struct topstar_laptop *topstar)
+{
+	topstar->led = (struct led_classdev) {
+		.default_trigger = "rfkill0",
+		.brightness_get = topstar_led_get,
+		.brightness_set_blocking = topstar_led_set,
+		.name = TOPSTAR_LAPTOP_CLASS "::wlan",
+	};
+
+	return led_classdev_register(&topstar->platform->dev, &topstar->led);
+}
+
+static void topstar_led_exit(struct topstar_laptop *topstar)
+{
+	led_classdev_unregister(&topstar->led);
+}
+
+/*
+ * Input
+ */
+
+static const struct key_entry topstar_keymap[] = {
+	{ KE_KEY, 0x80, { KEY_BRIGHTNESSUP } },
+	{ KE_KEY, 0x81, { KEY_BRIGHTNESSDOWN } },
+	{ KE_KEY, 0x83, { KEY_VOLUMEUP } },
+	{ KE_KEY, 0x84, { KEY_VOLUMEDOWN } },
+	{ KE_KEY, 0x85, { KEY_MUTE } },
+	{ KE_KEY, 0x86, { KEY_SWITCHVIDEOMODE } },
+	{ KE_KEY, 0x87, { KEY_F13 } }, /* touchpad enable/disable key */
+	{ KE_KEY, 0x88, { KEY_WLAN } },
+	{ KE_KEY, 0x8a, { KEY_WWW } },
+	{ KE_KEY, 0x8b, { KEY_MAIL } },
+	{ KE_KEY, 0x8c, { KEY_MEDIA } },
+
+	/* Known non hotkey events don't handled or that we don't care yet */
+	{ KE_IGNORE, 0x82, }, /* backlight event */
+	{ KE_IGNORE, 0x8e, },
+	{ KE_IGNORE, 0x8f, },
+	{ KE_IGNORE, 0x90, },
+
+	/*
+	 * 'G key' generate two event codes, convert to only
+	 * one event/key code for now, consider replacing by
+	 * a switch (3G switch - SW_3G?)
+	 */
+	{ KE_KEY, 0x96, { KEY_F14 } },
+	{ KE_KEY, 0x97, { KEY_F14 } },
+
+	{ KE_END, 0 }
+};
+
+static void topstar_input_notify(struct topstar_laptop *topstar, int event)
+{
+	if (!sparse_keymap_report_event(topstar->input, event, 1, true))
+		pr_info("unknown event = 0x%02x\n", event);
+}
+
+static int topstar_input_init(struct topstar_laptop *topstar)
+{
+	struct input_dev *input;
+	int err;
+
+	input = input_allocate_device();
+	if (!input)
+		return -ENOMEM;
+
+	input->name = "Topstar Laptop extra buttons";
+	input->phys = TOPSTAR_LAPTOP_CLASS "/input0";
+	input->id.bustype = BUS_HOST;
+	input->dev.parent = &topstar->platform->dev;
+
+	err = sparse_keymap_setup(input, topstar_keymap, NULL);
+	if (err) {
+		pr_err("Unable to setup input device keymap\n");
+		goto err_free_dev;
+	}
+
+	err = input_register_device(input);
+	if (err) {
+		pr_err("Unable to register input device\n");
+		goto err_free_dev;
+	}
+
+	topstar->input = input;
+	return 0;
+
+err_free_dev:
+	input_free_device(input);
+	return err;
+}
+
+static void topstar_input_exit(struct topstar_laptop *topstar)
+{
+	input_unregister_device(topstar->input);
+}
+
+/*
+ * Platform
+ */
+
+static struct platform_driver topstar_platform_driver = {
+	.driver = {
+		.name = TOPSTAR_LAPTOP_CLASS,
+	},
+};
+
+static int topstar_platform_init(struct topstar_laptop *topstar)
+{
+	int err;
+
+	topstar->platform = platform_device_alloc(TOPSTAR_LAPTOP_CLASS, PLATFORM_DEVID_NONE);
+	if (!topstar->platform)
+		return -ENOMEM;
+
+	platform_set_drvdata(topstar->platform, topstar);
+
+	err = platform_device_add(topstar->platform);
+	if (err)
+		goto err_device_put;
+
+	return 0;
+
+err_device_put:
+	platform_device_put(topstar->platform);
+	return err;
+}
+
+static void topstar_platform_exit(struct topstar_laptop *topstar)
+{
+	platform_device_unregister(topstar->platform);
+}
+
+/*
+ * ACPI
+ */
+
+static int topstar_acpi_fncx_switch(struct acpi_device *device, bool state)
+{
+	acpi_status status;
+	u64 arg = state ? 0x86 : 0x87;
+
+	status = acpi_execute_simple_method(device->handle, "FNCX", arg);
+	if (ACPI_FAILURE(status)) {
+		pr_err("Unable to switch FNCX notifications\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void topstar_acpi_notify(struct acpi_device *device, u32 event)
+{
+	struct topstar_laptop *topstar = acpi_driver_data(device);
+	static bool dup_evnt[2];
+	bool *dup;
+
+	/* 0x83 and 0x84 key events comes duplicated... */
+	if (event == 0x83 || event == 0x84) {
+		dup = &dup_evnt[event - 0x83];
+		if (*dup) {
+			*dup = false;
+			return;
+		}
+		*dup = true;
+	}
+
+	topstar_input_notify(topstar, event);
+}
+
+static int topstar_acpi_init(struct topstar_laptop *topstar)
+{
+	return topstar_acpi_fncx_switch(topstar->device, true);
+}
+
+static void topstar_acpi_exit(struct topstar_laptop *topstar)
+{
+	topstar_acpi_fncx_switch(topstar->device, false);
+}
+
+/*
+ * Enable software-based WLAN LED control on systems with defective
+ * hardware switch.
+ */
+static bool led_workaround;
+
+static int dmi_led_workaround(const struct dmi_system_id *id)
+{
+	led_workaround = true;
+	return 0;
+}
+
+static const struct dmi_system_id topstar_dmi_ids[] = {
+	{
+		.callback = dmi_led_workaround,
+		.ident = "Topstar U931/RVP7",
+		.matches = {
+			DMI_MATCH(DMI_BOARD_NAME, "U931"),
+			DMI_MATCH(DMI_BOARD_VERSION, "RVP7"),
+		},
+	},
+	{}
+};
+
+static int topstar_acpi_add(struct acpi_device *device)
+{
+	struct topstar_laptop *topstar;
+	int err;
+
+	dmi_check_system(topstar_dmi_ids);
+
+	topstar = kzalloc(sizeof(struct topstar_laptop), GFP_KERNEL);
+	if (!topstar)
+		return -ENOMEM;
+
+	strcpy(acpi_device_name(device), "Topstar TPSACPI");
+	strcpy(acpi_device_class(device), TOPSTAR_LAPTOP_CLASS);
+	device->driver_data = topstar;
+	topstar->device = device;
+
+	err = topstar_acpi_init(topstar);
+	if (err)
+		goto err_free;
+
+	err = topstar_platform_init(topstar);
+	if (err)
+		goto err_acpi_exit;
+
+	err = topstar_input_init(topstar);
+	if (err)
+		goto err_platform_exit;
+
+	if (led_workaround) {
+		err = topstar_led_init(topstar);
+		if (err)
+			goto err_input_exit;
+	}
+
+	return 0;
+
+err_input_exit:
+	topstar_input_exit(topstar);
+err_platform_exit:
+	topstar_platform_exit(topstar);
+err_acpi_exit:
+	topstar_acpi_exit(topstar);
+err_free:
+	kfree(topstar);
+	return err;
+}
+
+static int topstar_acpi_remove(struct acpi_device *device)
+{
+	struct topstar_laptop *topstar = acpi_driver_data(device);
+
+	if (led_workaround)
+		topstar_led_exit(topstar);
+
+	topstar_input_exit(topstar);
+	topstar_platform_exit(topstar);
+	topstar_acpi_exit(topstar);
+
+	kfree(topstar);
+	return 0;
+}
+
+static const struct acpi_device_id topstar_device_ids[] = {
+	{ "TPS0001", 0 },
+	{ "TPSACPI01", 0 },
+	{ "", 0 },
+};
+MODULE_DEVICE_TABLE(acpi, topstar_device_ids);
+
+static struct acpi_driver topstar_acpi_driver = {
+	.name = "Topstar laptop ACPI driver",
+	.class = TOPSTAR_LAPTOP_CLASS,
+	.ids = topstar_device_ids,
+	.ops = {
+		.add = topstar_acpi_add,
+		.remove = topstar_acpi_remove,
+		.notify = topstar_acpi_notify,
+	},
+};
+
+static int __init topstar_laptop_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&topstar_platform_driver);
+	if (ret < 0)
+		return ret;
+
+	ret = acpi_bus_register_driver(&topstar_acpi_driver);
+	if (ret < 0)
+		goto err_driver_unreg;
+
+	pr_info("ACPI extras driver loaded\n");
+	return 0;
+
+err_driver_unreg:
+	platform_driver_unregister(&topstar_platform_driver);
+	return ret;
+}
+
+static void __exit topstar_laptop_exit(void)
+{
+	acpi_bus_unregister_driver(&topstar_acpi_driver);
+	platform_driver_unregister(&topstar_platform_driver);
+}
+
+module_init(topstar_laptop_init);
+module_exit(topstar_laptop_exit);
+
+MODULE_AUTHOR("Herton Ronaldo Krzesinski");
+MODULE_AUTHOR("Guillaume Douézan-Grard");
+MODULE_DESCRIPTION("Topstar Laptop ACPI Extras driver");
+MODULE_LICENSE("GPL");