summaryrefslogtreecommitdiffstats
path: root/drivers/platform/x86/intel-hid.c
blob: 12dbb50633761b40253adff49f0c3881b40fed90 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
/*
 *  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_SUCCESS(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_SUCCESS(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_SUCCESS(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);
OpenPOWER on IntegriCloud