1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Topstar Laptop ACPI Extras driver
4  *
5  * Copyright (c) 2009 Herton Ronaldo Krzesinski <herton@mandriva.com.br>
6  * Copyright (c) 2018 Guillaume Douézan-Grard
7  *
8  * Implementation inspired by existing x86 platform drivers, in special
9  * asus/eepc/fujitsu-laptop, thanks to their authors.
10  */
11 
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/acpi.h>
19 #include <linux/dmi.h>
20 #include <linux/input.h>
21 #include <linux/input/sparse-keymap.h>
22 #include <linux/leds.h>
23 #include <linux/platform_device.h>
24 
25 #define TOPSTAR_LAPTOP_CLASS "topstar"
26 
27 struct topstar_laptop {
28 	struct acpi_device *device;
29 	struct platform_device *platform;
30 	struct input_dev *input;
31 	struct led_classdev led;
32 };
33 
34 /*
35  * LED
36  */
37 
38 static enum led_brightness topstar_led_get(struct led_classdev *led)
39 {
40 	return led->brightness;
41 }
42 
43 static int topstar_led_set(struct led_classdev *led,
44 		enum led_brightness state)
45 {
46 	struct topstar_laptop *topstar = container_of(led,
47 			struct topstar_laptop, led);
48 
49 	struct acpi_object_list params;
50 	union acpi_object in_obj;
51 	unsigned long long int ret;
52 	acpi_status status;
53 
54 	params.count = 1;
55 	params.pointer = &in_obj;
56 	in_obj.type = ACPI_TYPE_INTEGER;
57 	in_obj.integer.value = 0x83;
58 
59 	/*
60 	 * Topstar ACPI returns 0x30001 when the LED is ON and 0x30000 when it
61 	 * is OFF.
62 	 */
63 	status = acpi_evaluate_integer(topstar->device->handle,
64 			"GETX", &params, &ret);
65 	if (ACPI_FAILURE(status))
66 		return -1;
67 
68 	/*
69 	 * FNCX(0x83) toggles the LED (more precisely, it is supposed to
70 	 * act as an hardware switch and disconnect the WLAN adapter but
71 	 * it seems to be faulty on some models like the Topstar U931
72 	 * Notebook).
73 	 */
74 	if ((ret == 0x30001 && state == LED_OFF)
75 			|| (ret == 0x30000 && state != LED_OFF)) {
76 		status = acpi_execute_simple_method(topstar->device->handle,
77 				"FNCX", 0x83);
78 		if (ACPI_FAILURE(status))
79 			return -1;
80 	}
81 
82 	return 0;
83 }
84 
85 static int topstar_led_init(struct topstar_laptop *topstar)
86 {
87 	topstar->led = (struct led_classdev) {
88 		.default_trigger = "rfkill0",
89 		.brightness_get = topstar_led_get,
90 		.brightness_set_blocking = topstar_led_set,
91 		.name = TOPSTAR_LAPTOP_CLASS "::wlan",
92 	};
93 
94 	return led_classdev_register(&topstar->platform->dev, &topstar->led);
95 }
96 
97 static void topstar_led_exit(struct topstar_laptop *topstar)
98 {
99 	led_classdev_unregister(&topstar->led);
100 }
101 
102 /*
103  * Input
104  */
105 
106 static const struct key_entry topstar_keymap[] = {
107 	{ KE_KEY, 0x80, { KEY_BRIGHTNESSUP } },
108 	{ KE_KEY, 0x81, { KEY_BRIGHTNESSDOWN } },
109 	{ KE_KEY, 0x83, { KEY_VOLUMEUP } },
110 	{ KE_KEY, 0x84, { KEY_VOLUMEDOWN } },
111 	{ KE_KEY, 0x85, { KEY_MUTE } },
112 	{ KE_KEY, 0x86, { KEY_SWITCHVIDEOMODE } },
113 	{ KE_KEY, 0x87, { KEY_F13 } }, /* touchpad enable/disable key */
114 	{ KE_KEY, 0x88, { KEY_WLAN } },
115 	{ KE_KEY, 0x8a, { KEY_WWW } },
116 	{ KE_KEY, 0x8b, { KEY_MAIL } },
117 	{ KE_KEY, 0x8c, { KEY_MEDIA } },
118 
119 	/* Known non hotkey events don't handled or that we don't care yet */
120 	{ KE_IGNORE, 0x82, }, /* backlight event */
121 	{ KE_IGNORE, 0x8e, },
122 	{ KE_IGNORE, 0x8f, },
123 	{ KE_IGNORE, 0x90, },
124 
125 	/*
126 	 * 'G key' generate two event codes, convert to only
127 	 * one event/key code for now, consider replacing by
128 	 * a switch (3G switch - SW_3G?)
129 	 */
130 	{ KE_KEY, 0x96, { KEY_F14 } },
131 	{ KE_KEY, 0x97, { KEY_F14 } },
132 
133 	{ KE_END, 0 }
134 };
135 
136 static void topstar_input_notify(struct topstar_laptop *topstar, int event)
137 {
138 	if (!sparse_keymap_report_event(topstar->input, event, 1, true))
139 		pr_info("unknown event = 0x%02x\n", event);
140 }
141 
142 static int topstar_input_init(struct topstar_laptop *topstar)
143 {
144 	struct input_dev *input;
145 	int err;
146 
147 	input = input_allocate_device();
148 	if (!input)
149 		return -ENOMEM;
150 
151 	input->name = "Topstar Laptop extra buttons";
152 	input->phys = TOPSTAR_LAPTOP_CLASS "/input0";
153 	input->id.bustype = BUS_HOST;
154 	input->dev.parent = &topstar->platform->dev;
155 
156 	err = sparse_keymap_setup(input, topstar_keymap, NULL);
157 	if (err) {
158 		pr_err("Unable to setup input device keymap\n");
159 		goto err_free_dev;
160 	}
161 
162 	err = input_register_device(input);
163 	if (err) {
164 		pr_err("Unable to register input device\n");
165 		goto err_free_dev;
166 	}
167 
168 	topstar->input = input;
169 	return 0;
170 
171 err_free_dev:
172 	input_free_device(input);
173 	return err;
174 }
175 
176 static void topstar_input_exit(struct topstar_laptop *topstar)
177 {
178 	input_unregister_device(topstar->input);
179 }
180 
181 /*
182  * Platform
183  */
184 
185 static struct platform_driver topstar_platform_driver = {
186 	.driver = {
187 		.name = TOPSTAR_LAPTOP_CLASS,
188 	},
189 };
190 
191 static int topstar_platform_init(struct topstar_laptop *topstar)
192 {
193 	int err;
194 
195 	topstar->platform = platform_device_alloc(TOPSTAR_LAPTOP_CLASS, PLATFORM_DEVID_NONE);
196 	if (!topstar->platform)
197 		return -ENOMEM;
198 
199 	platform_set_drvdata(topstar->platform, topstar);
200 
201 	err = platform_device_add(topstar->platform);
202 	if (err)
203 		goto err_device_put;
204 
205 	return 0;
206 
207 err_device_put:
208 	platform_device_put(topstar->platform);
209 	return err;
210 }
211 
212 static void topstar_platform_exit(struct topstar_laptop *topstar)
213 {
214 	platform_device_unregister(topstar->platform);
215 }
216 
217 /*
218  * ACPI
219  */
220 
221 static int topstar_acpi_fncx_switch(struct acpi_device *device, bool state)
222 {
223 	acpi_status status;
224 	u64 arg = state ? 0x86 : 0x87;
225 
226 	status = acpi_execute_simple_method(device->handle, "FNCX", arg);
227 	if (ACPI_FAILURE(status)) {
228 		pr_err("Unable to switch FNCX notifications\n");
229 		return -ENODEV;
230 	}
231 
232 	return 0;
233 }
234 
235 static void topstar_acpi_notify(struct acpi_device *device, u32 event)
236 {
237 	struct topstar_laptop *topstar = acpi_driver_data(device);
238 	static bool dup_evnt[2];
239 	bool *dup;
240 
241 	/* 0x83 and 0x84 key events comes duplicated... */
242 	if (event == 0x83 || event == 0x84) {
243 		dup = &dup_evnt[event - 0x83];
244 		if (*dup) {
245 			*dup = false;
246 			return;
247 		}
248 		*dup = true;
249 	}
250 
251 	topstar_input_notify(topstar, event);
252 }
253 
254 static int topstar_acpi_init(struct topstar_laptop *topstar)
255 {
256 	return topstar_acpi_fncx_switch(topstar->device, true);
257 }
258 
259 static void topstar_acpi_exit(struct topstar_laptop *topstar)
260 {
261 	topstar_acpi_fncx_switch(topstar->device, false);
262 }
263 
264 /*
265  * Enable software-based WLAN LED control on systems with defective
266  * hardware switch.
267  */
268 static bool led_workaround;
269 
270 static int dmi_led_workaround(const struct dmi_system_id *id)
271 {
272 	led_workaround = true;
273 	return 0;
274 }
275 
276 static const struct dmi_system_id topstar_dmi_ids[] = {
277 	{
278 		.callback = dmi_led_workaround,
279 		.ident = "Topstar U931/RVP7",
280 		.matches = {
281 			DMI_MATCH(DMI_BOARD_NAME, "U931"),
282 			DMI_MATCH(DMI_BOARD_VERSION, "RVP7"),
283 		},
284 	},
285 	{}
286 };
287 
288 static int topstar_acpi_add(struct acpi_device *device)
289 {
290 	struct topstar_laptop *topstar;
291 	int err;
292 
293 	dmi_check_system(topstar_dmi_ids);
294 
295 	topstar = kzalloc(sizeof(struct topstar_laptop), GFP_KERNEL);
296 	if (!topstar)
297 		return -ENOMEM;
298 
299 	strcpy(acpi_device_name(device), "Topstar TPSACPI");
300 	strcpy(acpi_device_class(device), TOPSTAR_LAPTOP_CLASS);
301 	device->driver_data = topstar;
302 	topstar->device = device;
303 
304 	err = topstar_acpi_init(topstar);
305 	if (err)
306 		goto err_free;
307 
308 	err = topstar_platform_init(topstar);
309 	if (err)
310 		goto err_acpi_exit;
311 
312 	err = topstar_input_init(topstar);
313 	if (err)
314 		goto err_platform_exit;
315 
316 	if (led_workaround) {
317 		err = topstar_led_init(topstar);
318 		if (err)
319 			goto err_input_exit;
320 	}
321 
322 	return 0;
323 
324 err_input_exit:
325 	topstar_input_exit(topstar);
326 err_platform_exit:
327 	topstar_platform_exit(topstar);
328 err_acpi_exit:
329 	topstar_acpi_exit(topstar);
330 err_free:
331 	kfree(topstar);
332 	return err;
333 }
334 
335 static int topstar_acpi_remove(struct acpi_device *device)
336 {
337 	struct topstar_laptop *topstar = acpi_driver_data(device);
338 
339 	if (led_workaround)
340 		topstar_led_exit(topstar);
341 
342 	topstar_input_exit(topstar);
343 	topstar_platform_exit(topstar);
344 	topstar_acpi_exit(topstar);
345 
346 	kfree(topstar);
347 	return 0;
348 }
349 
350 static const struct acpi_device_id topstar_device_ids[] = {
351 	{ "TPS0001", 0 },
352 	{ "TPSACPI01", 0 },
353 	{ "", 0 },
354 };
355 MODULE_DEVICE_TABLE(acpi, topstar_device_ids);
356 
357 static struct acpi_driver topstar_acpi_driver = {
358 	.name = "Topstar laptop ACPI driver",
359 	.class = TOPSTAR_LAPTOP_CLASS,
360 	.ids = topstar_device_ids,
361 	.ops = {
362 		.add = topstar_acpi_add,
363 		.remove = topstar_acpi_remove,
364 		.notify = topstar_acpi_notify,
365 	},
366 };
367 
368 static int __init topstar_laptop_init(void)
369 {
370 	int ret;
371 
372 	ret = platform_driver_register(&topstar_platform_driver);
373 	if (ret < 0)
374 		return ret;
375 
376 	ret = acpi_bus_register_driver(&topstar_acpi_driver);
377 	if (ret < 0)
378 		goto err_driver_unreg;
379 
380 	pr_info("ACPI extras driver loaded\n");
381 	return 0;
382 
383 err_driver_unreg:
384 	platform_driver_unregister(&topstar_platform_driver);
385 	return ret;
386 }
387 
388 static void __exit topstar_laptop_exit(void)
389 {
390 	acpi_bus_unregister_driver(&topstar_acpi_driver);
391 	platform_driver_unregister(&topstar_platform_driver);
392 }
393 
394 module_init(topstar_laptop_init);
395 module_exit(topstar_laptop_exit);
396 
397 MODULE_AUTHOR("Herton Ronaldo Krzesinski");
398 MODULE_AUTHOR("Guillaume Douézan-Grard");
399 MODULE_DESCRIPTION("Topstar Laptop ACPI Extras driver");
400 MODULE_LICENSE("GPL");
401