[mirror_ubuntu-artful-kernel.git] / drivers / platform / x86 / intel-hid.c

/*
 *  Intel HID event driver for Windows 8
 *
 *  Copyright (C) 2015 Alex Hung <alex.hung@canonical.com>
 *  Copyright (C) 2015 Andrew Lutomirski <luto@kernel.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.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/input/sparse-keymap.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alex Hung");

static const struct acpi_device_id intel_hid_ids[] = {
	{"INT33D5", 0},
	{"", 0},
};

/* In theory, these are HID usages. */
static const struct key_entry intel_hid_keymap[] = {
	/* 1: LSuper (Page 0x07, usage 0xE3) -- unclear what to do */
	/* 2: Toggle SW_ROTATE_LOCK -- easy to implement if seen in wild */
	{ KE_KEY, 3, { KEY_NUMLOCK } },
	{ KE_KEY, 4, { KEY_HOME } },
	{ KE_KEY, 5, { KEY_END } },
	{ KE_KEY, 6, { KEY_PAGEUP } },
	{ KE_KEY, 7, { KEY_PAGEDOWN } },
	{ KE_KEY, 8, { KEY_RFKILL } },
	{ KE_KEY, 9, { KEY_POWER } },
	{ KE_KEY, 11, { KEY_SLEEP } },
	/* 13 has two different meanings in the spec -- ignore it. */
	{ KE_KEY, 14, { KEY_STOPCD } },
	{ KE_KEY, 15, { KEY_PLAYPAUSE } },
	{ KE_KEY, 16, { KEY_MUTE } },
	{ KE_KEY, 17, { KEY_VOLUMEUP } },
	{ KE_KEY, 18, { KEY_VOLUMEDOWN } },
	{ KE_KEY, 19, { KEY_BRIGHTNESSUP } },
	{ KE_KEY, 20, { KEY_BRIGHTNESSDOWN } },
	/* 27: wake -- needs special handling */
	{ KE_END },
};

struct intel_hid_priv {
	struct input_dev *input_dev;
};

static int intel_hid_set_enable(struct device *device, int enable)
{
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };
	acpi_status status;

	arg0.integer.value = enable;
	status = acpi_evaluate_object(ACPI_HANDLE(device), "HDSM", &args, NULL);
	if (ACPI_FAILURE(status)) {
		dev_warn(device, "failed to %sable hotkeys\n",
			 enable ? "en" : "dis");
		return -EIO;
	}

	return 0;
}

static int intel_hid_pl_suspend_handler(struct device *device)
{
	intel_hid_set_enable(device, 0);
	return 0;
}

static int intel_hid_pl_resume_handler(struct device *device)
{
	intel_hid_set_enable(device, 1);
	return 0;
}

static const struct dev_pm_ops intel_hid_pl_pm_ops = {
	.freeze  = intel_hid_pl_suspend_handler,
	.restore  = intel_hid_pl_resume_handler,
	.suspend  = intel_hid_pl_suspend_handler,
	.resume  = intel_hid_pl_resume_handler,
};

static int intel_hid_input_setup(struct platform_device *device)
{
	struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
	int ret;

	priv->input_dev = input_allocate_device();
	if (!priv->input_dev)
		return -ENOMEM;

	ret = sparse_keymap_setup(priv->input_dev, intel_hid_keymap, NULL);
	if (ret)
		goto err_free_device;

	priv->input_dev->dev.parent = &device->dev;
	priv->input_dev->name = "Intel HID events";
	priv->input_dev->id.bustype = BUS_HOST;
	set_bit(KEY_RFKILL, priv->input_dev->keybit);

	ret = input_register_device(priv->input_dev);
	if (ret)
		goto err_free_device;

	return 0;

err_free_device:
	input_free_device(priv->input_dev);
	return ret;
}

static void intel_hid_input_destroy(struct platform_device *device)
{
	struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);

	input_unregister_device(priv->input_dev);
}

static void notify_handler(acpi_handle handle, u32 event, void *context)
{
	struct platform_device *device = context;
	struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
	unsigned long long ev_index;
	acpi_status status;

	/* The platform spec only defines one event code: 0xC0. */
	if (event != 0xc0) {
		dev_warn(&device->dev, "received unknown event (0x%x)\n",
			 event);
		return;
	}

	status = acpi_evaluate_integer(handle, "HDEM", NULL, &ev_index);
	if (ACPI_FAILURE(status)) {
		dev_warn(&device->dev, "failed to get event index\n");
		return;
	}

	if (!sparse_keymap_report_event(priv->input_dev, ev_index, 1, true))
		dev_info(&device->dev, "unknown event index 0x%llx\n",
			 ev_index);
}

static int intel_hid_probe(struct platform_device *device)
{
	acpi_handle handle = ACPI_HANDLE(&device->dev);
	struct intel_hid_priv *priv;
	unsigned long long mode;
	acpi_status status;
	int err;

	status = acpi_evaluate_integer(handle, "HDMM", NULL, &mode);
	if (ACPI_FAILURE(status)) {
		dev_warn(&device->dev, "failed to read mode\n");
		return -ENODEV;
	}

	if (mode != 0) {
		/*
		 * This driver only implements "simple" mode.  There appear
		 * to be no other modes, but we should be paranoid and check
		 * for compatibility.
		 */
		dev_info(&device->dev, "platform is not in simple mode\n");
		return -ENODEV;
	}

	priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;
	dev_set_drvdata(&device->dev, priv);

	err = intel_hid_input_setup(device);
	if (err) {
		pr_err("Failed to setup Intel HID hotkeys\n");
		return err;
	}

	status = acpi_install_notify_handler(handle,
					     ACPI_DEVICE_NOTIFY,
					     notify_handler,
					     device);
	if (ACPI_FAILURE(status)) {
		err = -EBUSY;
		goto err_remove_input;
	}

	err = intel_hid_set_enable(&device->dev, 1);
	if (err)
		goto err_remove_notify;

	return 0;

err_remove_notify:
	acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);

err_remove_input:
	intel_hid_input_destroy(device);

	return err;
}

static int intel_hid_remove(struct platform_device *device)
{
	acpi_handle handle = ACPI_HANDLE(&device->dev);

	acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
	intel_hid_input_destroy(device);
	intel_hid_set_enable(&device->dev, 0);

	/*
	 * Even if we failed to shut off the event stream, we can still
	 * safely detach from the device.
	 */
	return 0;
}

static struct platform_driver intel_hid_pl_driver = {
	.driver = {
		.name = "intel-hid",
		.acpi_match_table = intel_hid_ids,
		.pm = &intel_hid_pl_pm_ops,
	},
	.probe = intel_hid_probe,
	.remove = intel_hid_remove,
};
MODULE_DEVICE_TABLE(acpi, intel_hid_ids);

/*
 * Unfortunately, some laptops provide a _HID="INT33D5" device with
 * _CID="PNP0C02".  This causes the pnpacpi scan driver to claim the
 * ACPI node, so no platform device will be created.  The pnpacpi
 * driver rejects this device in subsequent processing, so no physical
 * node is created at all.
 *
 * As a workaround until the ACPI core figures out how to handle
 * this corner case, manually ask the ACPI platform device code to
 * claim the ACPI node.
 */
static acpi_status __init
check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	const struct acpi_device_id *ids = context;
	struct acpi_device *dev;

	if (acpi_bus_get_device(handle, &dev) != 0)
		return AE_OK;

	if (acpi_match_device_ids(dev, ids) == 0)
		if (acpi_create_platform_device(dev, NULL))
			dev_info(&dev->dev,
				 "intel-hid: created platform device\n");

	return AE_OK;
}

static int __init intel_hid_init(void)
{
	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
			    ACPI_UINT32_MAX, check_acpi_dev, NULL,
			    (void *)intel_hid_ids, NULL);

	return platform_driver_register(&intel_hid_pl_driver);
}
module_init(intel_hid_init);

static void __exit intel_hid_exit(void)
{
	platform_driver_unregister(&intel_hid_pl_driver);
}
module_exit(intel_hid_exit);
Commit	Line	Data
ecc83e52 AH	1	/*
	2	* Intel HID event driver for Windows 8
	3	*
	4	* Copyright (C) 2015 Alex Hung <alex.hung@canonical.com>
	5	* Copyright (C) 2015 Andrew Lutomirski <luto@kernel.org>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	*/
	18
	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
	21	#include <linux/init.h>
	22	#include <linux/input.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/input/sparse-keymap.h>
	25	#include <linux/acpi.h>
	26	#include <acpi/acpi_bus.h>
	27
	28	MODULE_LICENSE("GPL");
	29	MODULE_AUTHOR("Alex Hung");
	30
	31	static const struct acpi_device_id intel_hid_ids[] = {
	32	{"INT33D5", 0},
	33	{"", 0},
	34	};
	35
	36	/* In theory, these are HID usages. */
	37	static const struct key_entry intel_hid_keymap[] = {
	38	/* 1: LSuper (Page 0x07, usage 0xE3) -- unclear what to do */
	39	/* 2: Toggle SW_ROTATE_LOCK -- easy to implement if seen in wild */
	40	{ KE_KEY, 3, { KEY_NUMLOCK } },
	41	{ KE_KEY, 4, { KEY_HOME } },
	42	{ KE_KEY, 5, { KEY_END } },
	43	{ KE_KEY, 6, { KEY_PAGEUP } },
1c319e78	44	{ KE_KEY, 7, { KEY_PAGEDOWN } },
ecc83e52 AH	45	{ KE_KEY, 8, { KEY_RFKILL } },
	46	{ KE_KEY, 9, { KEY_POWER } },
	47	{ KE_KEY, 11, { KEY_SLEEP } },
	48	/* 13 has two different meanings in the spec -- ignore it. */
	49	{ KE_KEY, 14, { KEY_STOPCD } },
	50	{ KE_KEY, 15, { KEY_PLAYPAUSE } },
	51	{ KE_KEY, 16, { KEY_MUTE } },
	52	{ KE_KEY, 17, { KEY_VOLUMEUP } },
	53	{ KE_KEY, 18, { KEY_VOLUMEDOWN } },
	54	{ KE_KEY, 19, { KEY_BRIGHTNESSUP } },
	55	{ KE_KEY, 20, { KEY_BRIGHTNESSDOWN } },
	56	/* 27: wake -- needs special handling */
	57	{ KE_END },
	58	};
	59
	60	struct intel_hid_priv {
	61	struct input_dev *input_dev;
	62	};
	63
	64	static int intel_hid_set_enable(struct device *device, int enable)
	65	{
	66	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	67	struct acpi_object_list args = { 1, &arg0 };
	68	acpi_status status;
	69
	70	arg0.integer.value = enable;
	71	status = acpi_evaluate_object(ACPI_HANDLE(device), "HDSM", &args, NULL);
3526ecad	72	if (ACPI_FAILURE(status)) {
ecc83e52 AH	73	dev_warn(device, "failed to %sable hotkeys\n",
	74	enable ? "en" : "dis");
	75	return -EIO;
	76	}
	77
	78	return 0;
	79	}
	80
	81	static int intel_hid_pl_suspend_handler(struct device *device)
	82	{
	83	intel_hid_set_enable(device, 0);
	84	return 0;
	85	}
	86
	87	static int intel_hid_pl_resume_handler(struct device *device)
	88	{
	89	intel_hid_set_enable(device, 1);
	90	return 0;
	91	}
	92
	93	static const struct dev_pm_ops intel_hid_pl_pm_ops = {
45aa56cd AH	94	.freeze = intel_hid_pl_suspend_handler,
45aa56cd AH	95	.restore = intel_hid_pl_resume_handler,
ecc83e52 AH	96	.suspend = intel_hid_pl_suspend_handler,
	97	.resume = intel_hid_pl_resume_handler,
	98	};
	99
	100	static int intel_hid_input_setup(struct platform_device *device)
	101	{
	102	struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
	103	int ret;
	104
	105	priv->input_dev = input_allocate_device();
	106	if (!priv->input_dev)
	107	return -ENOMEM;
	108
	109	ret = sparse_keymap_setup(priv->input_dev, intel_hid_keymap, NULL);
	110	if (ret)
	111	goto err_free_device;
	112
	113	priv->input_dev->dev.parent = &device->dev;
	114	priv->input_dev->name = "Intel HID events";
	115	priv->input_dev->id.bustype = BUS_HOST;
	116	set_bit(KEY_RFKILL, priv->input_dev->keybit);
	117
	118	ret = input_register_device(priv->input_dev);
	119	if (ret)
	120	goto err_free_device;
	121
	122	return 0;
	123
	124	err_free_device:
1d6de071 AH	125	input_free_device(priv->input_dev);
1d6de071 AH	126	return ret;
ecc83e52 AH	127	}
	128
	129	static void intel_hid_input_destroy(struct platform_device *device)
	130	{
	131	struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
	132
	133	input_unregister_device(priv->input_dev);
	134	}
	135
	136	static void notify_handler(acpi_handle handle, u32 event, void *context)
	137	{
	138	struct platform_device *device = context;
	139	struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
	140	unsigned long long ev_index;
	141	acpi_status status;
	142
	143	/* The platform spec only defines one event code: 0xC0. */
	144	if (event != 0xc0) {
	145	dev_warn(&device->dev, "received unknown event (0x%x)\n",
	146	event);
	147	return;
	148	}
	149
	150	status = acpi_evaluate_integer(handle, "HDEM", NULL, &ev_index);
3526ecad	151	if (ACPI_FAILURE(status)) {
ecc83e52 AH	152	dev_warn(&device->dev, "failed to get event index\n");
	153	return;
	154	}
	155
	156	if (!sparse_keymap_report_event(priv->input_dev, ev_index, 1, true))
	157	dev_info(&device->dev, "unknown event index 0x%llx\n",
	158	ev_index);
	159	}
	160
	161	static int intel_hid_probe(struct platform_device *device)
	162	{
	163	acpi_handle handle = ACPI_HANDLE(&device->dev);
	164	struct intel_hid_priv *priv;
	165	unsigned long long mode;
	166	acpi_status status;
	167	int err;
	168
	169	status = acpi_evaluate_integer(handle, "HDMM", NULL, &mode);
3526ecad	170	if (ACPI_FAILURE(status)) {
ecc83e52 AH	171	dev_warn(&device->dev, "failed to read mode\n");
	172	return -ENODEV;
	173	}
	174
	175	if (mode != 0) {
	176	/*
	177	* This driver only implements "simple" mode. There appear
	178	* to be no other modes, but we should be paranoid and check
	179	* for compatibility.
	180	*/
	181	dev_info(&device->dev, "platform is not in simple mode\n");
	182	return -ENODEV;
	183	}
	184
e8b69a51	185	priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
ecc83e52 AH	186	if (!priv)
	187	return -ENOMEM;
	188	dev_set_drvdata(&device->dev, priv);
	189
	190	err = intel_hid_input_setup(device);
	191	if (err) {
	192	pr_err("Failed to setup Intel HID hotkeys\n");
	193	return err;
	194	}
	195
	196	status = acpi_install_notify_handler(handle,
	197	ACPI_DEVICE_NOTIFY,
	198	notify_handler,
	199	device);
	200	if (ACPI_FAILURE(status)) {
	201	err = -EBUSY;
	202	goto err_remove_input;
	203	}
	204
	205	err = intel_hid_set_enable(&device->dev, 1);
	206	if (err)
	207	goto err_remove_notify;
	208
	209	return 0;
	210
	211	err_remove_notify:
	212	acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
	213
	214	err_remove_input:
	215	intel_hid_input_destroy(device);
	216
	217	return err;
	218	}
	219
	220	static int intel_hid_remove(struct platform_device *device)
	221	{
	222	acpi_handle handle = ACPI_HANDLE(&device->dev);
	223
	224	acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
	225	intel_hid_input_destroy(device);
	226	intel_hid_set_enable(&device->dev, 0);
ecc83e52 AH	227
	228	/*
	229	* Even if we failed to shut off the event stream, we can still
	230	* safely detach from the device.
	231	*/
	232	return 0;
	233	}
	234
	235	static struct platform_driver intel_hid_pl_driver = {
	236	.driver = {
	237	.name = "intel-hid",
	238	.acpi_match_table = intel_hid_ids,
	239	.pm = &intel_hid_pl_pm_ops,
	240	},
	241	.probe = intel_hid_probe,
	242	.remove = intel_hid_remove,
	243	};
	244	MODULE_DEVICE_TABLE(acpi, intel_hid_ids);
	245
	246	/*
	247	* Unfortunately, some laptops provide a _HID="INT33D5" device with
	248	* _CID="PNP0C02". This causes the pnpacpi scan driver to claim the
	249	* ACPI node, so no platform device will be created. The pnpacpi
	250	* driver rejects this device in subsequent processing, so no physical
	251	* node is created at all.
	252	*
	253	* As a workaround until the ACPI core figures out how to handle
	254	* this corner case, manually ask the ACPI platform device code to
	255	* claim the ACPI node.
	256	*/
	257	static acpi_status __init
	258	check_acpi_dev(acpi_handle handle, u32 lvl, void context, void *rv)
	259	{
	260	const struct acpi_device_id *ids = context;
	261	struct acpi_device *dev;
	262
	263	if (acpi_bus_get_device(handle, &dev) != 0)
	264	return AE_OK;
	265
	266	if (acpi_match_device_ids(dev, ids) == 0)
1571875b	267	if (acpi_create_platform_device(dev, NULL))
ecc83e52 AH	268	dev_info(&dev->dev,
	269	"intel-hid: created platform device\n");
	270
	271	return AE_OK;
	272	}
	273
	274	static int __init intel_hid_init(void)
	275	{
	276	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
	277	ACPI_UINT32_MAX, check_acpi_dev, NULL,
	278	(void *)intel_hid_ids, NULL);
	279
	280	return platform_driver_register(&intel_hid_pl_driver);
	281	}
	282	module_init(intel_hid_init);
	283
	284	static void __exit intel_hid_exit(void)
	285	{
	286	platform_driver_unregister(&intel_hid_pl_driver);
	287	}
	288	module_exit(intel_hid_exit);