summaryrefslogtreecommitdiff
path: root/drivers/platform/x86/topstar-laptop.c
blob: 20df1ebefc30e4c27abe53a00d9bb5cefe1bcd99 (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
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
// 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 void 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);
}

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");