1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * lenovo-ymc.c - Lenovo Yoga Mode Control driver
13 #include <linux/input/sparse-keymap.h>
15 #include "ideapad-laptop.h"
17 #define LENOVO_YMC_EVENT_GUID	"06129D99-6083-4164-81AD-F092F9D773A6"
18 #define LENOVO_YMC_QUERY_GUID	"09B0EE6E-C3FD-4243-8DA1-7911FF80BB8C"
25 MODULE_PARM_DESC(ec_trigger, "Enable EC triggering work-around to force emitting tablet mode events…
27 static bool force;  variable
28 module_param(force, bool, 0444);
29 MODULE_PARM_DESC(force, "Force loading on boards without a convertible DMI chassis-type");
72 	if (!priv->ec_acpi_dev)  in lenovo_ymc_trigger_ec()
75 	err = write_ec_cmd(priv->ec_acpi_dev->handle, VPCCMD_W_YMC, 1);  in lenovo_ymc_trigger_ec()
77 		dev_warn(&wdev->dev, "Could not write YMC: %d\n", err);  in lenovo_ymc_trigger_ec()
94 	struct lenovo_ymc_private *priv = dev_get_drvdata(&wdev->dev);  in lenovo_ymc_notify()
108 		dev_warn(&wdev->dev,  in lenovo_ymc_notify()
116 	if (obj->type != ACPI_TYPE_INTEGER) {  in lenovo_ymc_notify()
117 		dev_warn(&wdev->dev,  in lenovo_ymc_notify()
121 	code = obj->integer.value;  in lenovo_ymc_notify()
123 	if (!sparse_keymap_report_event(priv->input_dev, code, 1, true))  in lenovo_ymc_notify()
124 		dev_warn(&wdev->dev, "Unknown key %d pressed\n", code);  in lenovo_ymc_notify()
140 		if (force)  in lenovo_ymc_probe()
141 			dev_info(&wdev->dev, "Force loading Lenovo YMC support\n");  in lenovo_ymc_probe()
143 			return -ENODEV;  in lenovo_ymc_probe()
148 	priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);  in lenovo_ymc_probe()
150 		return -ENOMEM;  in lenovo_ymc_probe()
154 		priv->ec_acpi_dev = acpi_dev_get_first_match_dev("VPC2004", NULL, -1);  in lenovo_ymc_probe()
156 		if (!priv->ec_acpi_dev) {  in lenovo_ymc_probe()
157 			dev_err(&wdev->dev, "Could not find EC ACPI device.\n");  in lenovo_ymc_probe()
158 			return -ENODEV;  in lenovo_ymc_probe()
160 		err = devm_add_action_or_reset(&wdev->dev,  in lenovo_ymc_probe()
161 				acpi_dev_put_helper, priv->ec_acpi_dev);  in lenovo_ymc_probe()
163 			dev_err(&wdev->dev,  in lenovo_ymc_probe()
169 	input_dev = devm_input_allocate_device(&wdev->dev);  in lenovo_ymc_probe()
171 		return -ENOMEM;  in lenovo_ymc_probe()
173 	input_dev->name = "Lenovo Yoga Tablet Mode Control switch";  in lenovo_ymc_probe()
174 	input_dev->phys = LENOVO_YMC_EVENT_GUID "/input0";  in lenovo_ymc_probe()
175 	input_dev->id.bustype = BUS_HOST;  in lenovo_ymc_probe()
176 	input_dev->dev.parent = &wdev->dev;  in lenovo_ymc_probe()
179 		dev_err(&wdev->dev,  in lenovo_ymc_probe()
186 		dev_err(&wdev->dev,  in lenovo_ymc_probe()
191 	priv->input_dev = input_dev;  in lenovo_ymc_probe()
192 	dev_set_drvdata(&wdev->dev, priv);  in lenovo_ymc_probe()
208 		.name = "lenovo-ymc",
218 MODULE_DESCRIPTION("Lenovo Yoga Mode Control driver");