1 /*
2  *  ideapad-laptop.c - Lenovo IdeaPad ACPI Extras
3  *
4  *  Copyright © 2010 Intel Corporation
5  *  Copyright © 2010 David Woodhouse <dwmw2@infradead.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  *  You should have received a copy of the GNU General Public License
18  *  along with this program; if not, write to the Free Software
19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20  *  02110-1301, USA.
21  */
22 
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/types.h>
29 #include <linux/acpi.h>
30 #include <linux/rfkill.h>
31 #include <linux/platform_device.h>
32 #include <linux/input.h>
33 #include <linux/input/sparse-keymap.h>
34 #include <linux/backlight.h>
35 #include <linux/fb.h>
36 #include <linux/debugfs.h>
37 #include <linux/seq_file.h>
38 #include <linux/i8042.h>
39 #include <linux/dmi.h>
40 #include <linux/device.h>
41 #include <acpi/video.h>
42 
43 #define IDEAPAD_RFKILL_DEV_NUM	(3)
44 
45 #define CFG_BT_BIT	(16)
46 #define CFG_3G_BIT	(17)
47 #define CFG_WIFI_BIT	(18)
48 #define CFG_CAMERA_BIT	(19)
49 
50 #if IS_ENABLED(CONFIG_ACPI_WMI)
51 static const char *const ideapad_wmi_fnesc_events[] = {
52 	"26CAB2E5-5CF1-46AE-AAC3-4A12B6BA50E6", /* Yoga 3 */
53 	"56322276-8493-4CE8-A783-98C991274F5E", /* Yoga 700 */
54 };
55 #endif
56 
57 enum {
58 	VPCCMD_R_VPC1 = 0x10,
59 	VPCCMD_R_BL_MAX,
60 	VPCCMD_R_BL,
61 	VPCCMD_W_BL,
62 	VPCCMD_R_WIFI,
63 	VPCCMD_W_WIFI,
64 	VPCCMD_R_BT,
65 	VPCCMD_W_BT,
66 	VPCCMD_R_BL_POWER,
67 	VPCCMD_R_NOVO,
68 	VPCCMD_R_VPC2,
69 	VPCCMD_R_TOUCHPAD,
70 	VPCCMD_W_TOUCHPAD,
71 	VPCCMD_R_CAMERA,
72 	VPCCMD_W_CAMERA,
73 	VPCCMD_R_3G,
74 	VPCCMD_W_3G,
75 	VPCCMD_R_ODD, /* 0x21 */
76 	VPCCMD_W_FAN,
77 	VPCCMD_R_RF,
78 	VPCCMD_W_RF,
79 	VPCCMD_R_FAN = 0x2B,
80 	VPCCMD_R_SPECIAL_BUTTONS = 0x31,
81 	VPCCMD_W_BL_POWER = 0x33,
82 };
83 
84 struct ideapad_rfk_priv {
85 	int dev;
86 	struct ideapad_private *priv;
87 };
88 
89 struct ideapad_private {
90 	struct acpi_device *adev;
91 	struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
92 	struct ideapad_rfk_priv rfk_priv[IDEAPAD_RFKILL_DEV_NUM];
93 	struct platform_device *platform_device;
94 	struct input_dev *inputdev;
95 	struct backlight_device *blightdev;
96 	struct dentry *debug;
97 	unsigned long cfg;
98 	bool has_hw_rfkill_switch;
99 	const char *fnesc_guid;
100 };
101 
102 static bool no_bt_rfkill;
103 module_param(no_bt_rfkill, bool, 0444);
104 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
105 
106 /*
107  * ACPI Helpers
108  */
109 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
110 
111 static int read_method_int(acpi_handle handle, const char *method, int *val)
112 {
113 	acpi_status status;
114 	unsigned long long result;
115 
116 	status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
117 	if (ACPI_FAILURE(status)) {
118 		*val = -1;
119 		return -1;
120 	} else {
121 		*val = result;
122 		return 0;
123 	}
124 }
125 
126 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
127 {
128 	acpi_status status;
129 	unsigned long long result;
130 	struct acpi_object_list params;
131 	union acpi_object in_obj;
132 
133 	params.count = 1;
134 	params.pointer = &in_obj;
135 	in_obj.type = ACPI_TYPE_INTEGER;
136 	in_obj.integer.value = cmd;
137 
138 	status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
139 
140 	if (ACPI_FAILURE(status)) {
141 		*ret = -1;
142 		return -1;
143 	} else {
144 		*ret = result;
145 		return 0;
146 	}
147 }
148 
149 static int method_vpcw(acpi_handle handle, int cmd, int data)
150 {
151 	struct acpi_object_list params;
152 	union acpi_object in_obj[2];
153 	acpi_status status;
154 
155 	params.count = 2;
156 	params.pointer = in_obj;
157 	in_obj[0].type = ACPI_TYPE_INTEGER;
158 	in_obj[0].integer.value = cmd;
159 	in_obj[1].type = ACPI_TYPE_INTEGER;
160 	in_obj[1].integer.value = data;
161 
162 	status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
163 	if (status != AE_OK)
164 		return -1;
165 	return 0;
166 }
167 
168 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
169 {
170 	int val;
171 	unsigned long int end_jiffies;
172 
173 	if (method_vpcw(handle, 1, cmd))
174 		return -1;
175 
176 	for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
177 	     time_before(jiffies, end_jiffies);) {
178 		schedule();
179 		if (method_vpcr(handle, 1, &val))
180 			return -1;
181 		if (val == 0) {
182 			if (method_vpcr(handle, 0, &val))
183 				return -1;
184 			*data = val;
185 			return 0;
186 		}
187 	}
188 	pr_err("timeout in read_ec_cmd\n");
189 	return -1;
190 }
191 
192 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
193 {
194 	int val;
195 	unsigned long int end_jiffies;
196 
197 	if (method_vpcw(handle, 0, data))
198 		return -1;
199 	if (method_vpcw(handle, 1, cmd))
200 		return -1;
201 
202 	for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
203 	     time_before(jiffies, end_jiffies);) {
204 		schedule();
205 		if (method_vpcr(handle, 1, &val))
206 			return -1;
207 		if (val == 0)
208 			return 0;
209 	}
210 	pr_err("timeout in write_ec_cmd\n");
211 	return -1;
212 }
213 
214 /*
215  * debugfs
216  */
217 static int debugfs_status_show(struct seq_file *s, void *data)
218 {
219 	struct ideapad_private *priv = s->private;
220 	unsigned long value;
221 
222 	if (!priv)
223 		return -EINVAL;
224 
225 	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &value))
226 		seq_printf(s, "Backlight max:\t%lu\n", value);
227 	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL, &value))
228 		seq_printf(s, "Backlight now:\t%lu\n", value);
229 	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &value))
230 		seq_printf(s, "BL power value:\t%s\n", value ? "On" : "Off");
231 	seq_printf(s, "=====================\n");
232 
233 	if (!read_ec_data(priv->adev->handle, VPCCMD_R_RF, &value))
234 		seq_printf(s, "Radio status:\t%s(%lu)\n",
235 			   value ? "On" : "Off", value);
236 	if (!read_ec_data(priv->adev->handle, VPCCMD_R_WIFI, &value))
237 		seq_printf(s, "Wifi status:\t%s(%lu)\n",
238 			   value ? "On" : "Off", value);
239 	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BT, &value))
240 		seq_printf(s, "BT status:\t%s(%lu)\n",
241 			   value ? "On" : "Off", value);
242 	if (!read_ec_data(priv->adev->handle, VPCCMD_R_3G, &value))
243 		seq_printf(s, "3G status:\t%s(%lu)\n",
244 			   value ? "On" : "Off", value);
245 	seq_printf(s, "=====================\n");
246 
247 	if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value))
248 		seq_printf(s, "Touchpad status:%s(%lu)\n",
249 			   value ? "On" : "Off", value);
250 	if (!read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &value))
251 		seq_printf(s, "Camera status:\t%s(%lu)\n",
252 			   value ? "On" : "Off", value);
253 
254 	return 0;
255 }
256 
257 static int debugfs_status_open(struct inode *inode, struct file *file)
258 {
259 	return single_open(file, debugfs_status_show, inode->i_private);
260 }
261 
262 static const struct file_operations debugfs_status_fops = {
263 	.owner = THIS_MODULE,
264 	.open = debugfs_status_open,
265 	.read = seq_read,
266 	.llseek = seq_lseek,
267 	.release = single_release,
268 };
269 
270 static int debugfs_cfg_show(struct seq_file *s, void *data)
271 {
272 	struct ideapad_private *priv = s->private;
273 
274 	if (!priv) {
275 		seq_printf(s, "cfg: N/A\n");
276 	} else {
277 		seq_printf(s, "cfg: 0x%.8lX\n\nCapability: ",
278 			   priv->cfg);
279 		if (test_bit(CFG_BT_BIT, &priv->cfg))
280 			seq_printf(s, "Bluetooth ");
281 		if (test_bit(CFG_3G_BIT, &priv->cfg))
282 			seq_printf(s, "3G ");
283 		if (test_bit(CFG_WIFI_BIT, &priv->cfg))
284 			seq_printf(s, "Wireless ");
285 		if (test_bit(CFG_CAMERA_BIT, &priv->cfg))
286 			seq_printf(s, "Camera ");
287 		seq_printf(s, "\nGraphic: ");
288 		switch ((priv->cfg)&0x700) {
289 		case 0x100:
290 			seq_printf(s, "Intel");
291 			break;
292 		case 0x200:
293 			seq_printf(s, "ATI");
294 			break;
295 		case 0x300:
296 			seq_printf(s, "Nvidia");
297 			break;
298 		case 0x400:
299 			seq_printf(s, "Intel and ATI");
300 			break;
301 		case 0x500:
302 			seq_printf(s, "Intel and Nvidia");
303 			break;
304 		}
305 		seq_printf(s, "\n");
306 	}
307 	return 0;
308 }
309 
310 static int debugfs_cfg_open(struct inode *inode, struct file *file)
311 {
312 	return single_open(file, debugfs_cfg_show, inode->i_private);
313 }
314 
315 static const struct file_operations debugfs_cfg_fops = {
316 	.owner = THIS_MODULE,
317 	.open = debugfs_cfg_open,
318 	.read = seq_read,
319 	.llseek = seq_lseek,
320 	.release = single_release,
321 };
322 
323 static int ideapad_debugfs_init(struct ideapad_private *priv)
324 {
325 	struct dentry *node;
326 
327 	priv->debug = debugfs_create_dir("ideapad", NULL);
328 	if (priv->debug == NULL) {
329 		pr_err("failed to create debugfs directory");
330 		goto errout;
331 	}
332 
333 	node = debugfs_create_file("cfg", S_IRUGO, priv->debug, priv,
334 				   &debugfs_cfg_fops);
335 	if (!node) {
336 		pr_err("failed to create cfg in debugfs");
337 		goto errout;
338 	}
339 
340 	node = debugfs_create_file("status", S_IRUGO, priv->debug, priv,
341 				   &debugfs_status_fops);
342 	if (!node) {
343 		pr_err("failed to create status in debugfs");
344 		goto errout;
345 	}
346 
347 	return 0;
348 
349 errout:
350 	return -ENOMEM;
351 }
352 
353 static void ideapad_debugfs_exit(struct ideapad_private *priv)
354 {
355 	debugfs_remove_recursive(priv->debug);
356 	priv->debug = NULL;
357 }
358 
359 /*
360  * sysfs
361  */
362 static ssize_t show_ideapad_cam(struct device *dev,
363 				struct device_attribute *attr,
364 				char *buf)
365 {
366 	unsigned long result;
367 	struct ideapad_private *priv = dev_get_drvdata(dev);
368 
369 	if (read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &result))
370 		return sprintf(buf, "-1\n");
371 	return sprintf(buf, "%lu\n", result);
372 }
373 
374 static ssize_t store_ideapad_cam(struct device *dev,
375 				 struct device_attribute *attr,
376 				 const char *buf, size_t count)
377 {
378 	int ret, state;
379 	struct ideapad_private *priv = dev_get_drvdata(dev);
380 
381 	if (!count)
382 		return 0;
383 	if (sscanf(buf, "%i", &state) != 1)
384 		return -EINVAL;
385 	ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_CAMERA, state);
386 	if (ret < 0)
387 		return -EIO;
388 	return count;
389 }
390 
391 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
392 
393 static ssize_t show_ideapad_fan(struct device *dev,
394 				struct device_attribute *attr,
395 				char *buf)
396 {
397 	unsigned long result;
398 	struct ideapad_private *priv = dev_get_drvdata(dev);
399 
400 	if (read_ec_data(priv->adev->handle, VPCCMD_R_FAN, &result))
401 		return sprintf(buf, "-1\n");
402 	return sprintf(buf, "%lu\n", result);
403 }
404 
405 static ssize_t store_ideapad_fan(struct device *dev,
406 				 struct device_attribute *attr,
407 				 const char *buf, size_t count)
408 {
409 	int ret, state;
410 	struct ideapad_private *priv = dev_get_drvdata(dev);
411 
412 	if (!count)
413 		return 0;
414 	if (sscanf(buf, "%i", &state) != 1)
415 		return -EINVAL;
416 	if (state < 0 || state > 4 || state == 3)
417 		return -EINVAL;
418 	ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_FAN, state);
419 	if (ret < 0)
420 		return -EIO;
421 	return count;
422 }
423 
424 static DEVICE_ATTR(fan_mode, 0644, show_ideapad_fan, store_ideapad_fan);
425 
426 static struct attribute *ideapad_attributes[] = {
427 	&dev_attr_camera_power.attr,
428 	&dev_attr_fan_mode.attr,
429 	NULL
430 };
431 
432 static umode_t ideapad_is_visible(struct kobject *kobj,
433 				 struct attribute *attr,
434 				 int idx)
435 {
436 	struct device *dev = container_of(kobj, struct device, kobj);
437 	struct ideapad_private *priv = dev_get_drvdata(dev);
438 	bool supported;
439 
440 	if (attr == &dev_attr_camera_power.attr)
441 		supported = test_bit(CFG_CAMERA_BIT, &(priv->cfg));
442 	else if (attr == &dev_attr_fan_mode.attr) {
443 		unsigned long value;
444 		supported = !read_ec_data(priv->adev->handle, VPCCMD_R_FAN,
445 					  &value);
446 	} else
447 		supported = true;
448 
449 	return supported ? attr->mode : 0;
450 }
451 
452 static const struct attribute_group ideapad_attribute_group = {
453 	.is_visible = ideapad_is_visible,
454 	.attrs = ideapad_attributes
455 };
456 
457 /*
458  * Rfkill
459  */
460 struct ideapad_rfk_data {
461 	char *name;
462 	int cfgbit;
463 	int opcode;
464 	int type;
465 };
466 
467 static const struct ideapad_rfk_data ideapad_rfk_data[] = {
468 	{ "ideapad_wlan",    CFG_WIFI_BIT, VPCCMD_W_WIFI, RFKILL_TYPE_WLAN },
469 	{ "ideapad_bluetooth", CFG_BT_BIT, VPCCMD_W_BT, RFKILL_TYPE_BLUETOOTH },
470 	{ "ideapad_3g",        CFG_3G_BIT, VPCCMD_W_3G, RFKILL_TYPE_WWAN },
471 };
472 
473 static int ideapad_rfk_set(void *data, bool blocked)
474 {
475 	struct ideapad_rfk_priv *priv = data;
476 	int opcode = ideapad_rfk_data[priv->dev].opcode;
477 
478 	return write_ec_cmd(priv->priv->adev->handle, opcode, !blocked);
479 }
480 
481 static struct rfkill_ops ideapad_rfk_ops = {
482 	.set_block = ideapad_rfk_set,
483 };
484 
485 static void ideapad_sync_rfk_state(struct ideapad_private *priv)
486 {
487 	unsigned long hw_blocked = 0;
488 	int i;
489 
490 	if (priv->has_hw_rfkill_switch) {
491 		if (read_ec_data(priv->adev->handle, VPCCMD_R_RF, &hw_blocked))
492 			return;
493 		hw_blocked = !hw_blocked;
494 	}
495 
496 	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
497 		if (priv->rfk[i])
498 			rfkill_set_hw_state(priv->rfk[i], hw_blocked);
499 }
500 
501 static int ideapad_register_rfkill(struct ideapad_private *priv, int dev)
502 {
503 	int ret;
504 	unsigned long sw_blocked;
505 
506 	if (no_bt_rfkill &&
507 	    (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
508 		/* Force to enable bluetooth when no_bt_rfkill=1 */
509 		write_ec_cmd(priv->adev->handle,
510 			     ideapad_rfk_data[dev].opcode, 1);
511 		return 0;
512 	}
513 	priv->rfk_priv[dev].dev = dev;
514 	priv->rfk_priv[dev].priv = priv;
515 
516 	priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name,
517 				      &priv->platform_device->dev,
518 				      ideapad_rfk_data[dev].type,
519 				      &ideapad_rfk_ops,
520 				      &priv->rfk_priv[dev]);
521 	if (!priv->rfk[dev])
522 		return -ENOMEM;
523 
524 	if (read_ec_data(priv->adev->handle, ideapad_rfk_data[dev].opcode-1,
525 			 &sw_blocked)) {
526 		rfkill_init_sw_state(priv->rfk[dev], 0);
527 	} else {
528 		sw_blocked = !sw_blocked;
529 		rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
530 	}
531 
532 	ret = rfkill_register(priv->rfk[dev]);
533 	if (ret) {
534 		rfkill_destroy(priv->rfk[dev]);
535 		return ret;
536 	}
537 	return 0;
538 }
539 
540 static void ideapad_unregister_rfkill(struct ideapad_private *priv, int dev)
541 {
542 	if (!priv->rfk[dev])
543 		return;
544 
545 	rfkill_unregister(priv->rfk[dev]);
546 	rfkill_destroy(priv->rfk[dev]);
547 }
548 
549 /*
550  * Platform device
551  */
552 static int ideapad_sysfs_init(struct ideapad_private *priv)
553 {
554 	return sysfs_create_group(&priv->platform_device->dev.kobj,
555 				    &ideapad_attribute_group);
556 }
557 
558 static void ideapad_sysfs_exit(struct ideapad_private *priv)
559 {
560 	sysfs_remove_group(&priv->platform_device->dev.kobj,
561 			   &ideapad_attribute_group);
562 }
563 
564 /*
565  * input device
566  */
567 static const struct key_entry ideapad_keymap[] = {
568 	{ KE_KEY, 6,  { KEY_SWITCHVIDEOMODE } },
569 	{ KE_KEY, 7,  { KEY_CAMERA } },
570 	{ KE_KEY, 8,  { KEY_MICMUTE } },
571 	{ KE_KEY, 11, { KEY_F16 } },
572 	{ KE_KEY, 13, { KEY_WLAN } },
573 	{ KE_KEY, 16, { KEY_PROG1 } },
574 	{ KE_KEY, 17, { KEY_PROG2 } },
575 	{ KE_KEY, 64, { KEY_PROG3 } },
576 	{ KE_KEY, 65, { KEY_PROG4 } },
577 	{ KE_KEY, 66, { KEY_TOUCHPAD_OFF } },
578 	{ KE_KEY, 67, { KEY_TOUCHPAD_ON } },
579 	{ KE_KEY, 128, { KEY_ESC } },
580 
581 	{ KE_END, 0 },
582 };
583 
584 static int ideapad_input_init(struct ideapad_private *priv)
585 {
586 	struct input_dev *inputdev;
587 	int error;
588 
589 	inputdev = input_allocate_device();
590 	if (!inputdev)
591 		return -ENOMEM;
592 
593 	inputdev->name = "Ideapad extra buttons";
594 	inputdev->phys = "ideapad/input0";
595 	inputdev->id.bustype = BUS_HOST;
596 	inputdev->dev.parent = &priv->platform_device->dev;
597 
598 	error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
599 	if (error) {
600 		pr_err("Unable to setup input device keymap\n");
601 		goto err_free_dev;
602 	}
603 
604 	error = input_register_device(inputdev);
605 	if (error) {
606 		pr_err("Unable to register input device\n");
607 		goto err_free_keymap;
608 	}
609 
610 	priv->inputdev = inputdev;
611 	return 0;
612 
613 err_free_keymap:
614 	sparse_keymap_free(inputdev);
615 err_free_dev:
616 	input_free_device(inputdev);
617 	return error;
618 }
619 
620 static void ideapad_input_exit(struct ideapad_private *priv)
621 {
622 	sparse_keymap_free(priv->inputdev);
623 	input_unregister_device(priv->inputdev);
624 	priv->inputdev = NULL;
625 }
626 
627 static void ideapad_input_report(struct ideapad_private *priv,
628 				 unsigned long scancode)
629 {
630 	sparse_keymap_report_event(priv->inputdev, scancode, 1, true);
631 }
632 
633 static void ideapad_input_novokey(struct ideapad_private *priv)
634 {
635 	unsigned long long_pressed;
636 
637 	if (read_ec_data(priv->adev->handle, VPCCMD_R_NOVO, &long_pressed))
638 		return;
639 	if (long_pressed)
640 		ideapad_input_report(priv, 17);
641 	else
642 		ideapad_input_report(priv, 16);
643 }
644 
645 static void ideapad_check_special_buttons(struct ideapad_private *priv)
646 {
647 	unsigned long bit, value;
648 
649 	read_ec_data(priv->adev->handle, VPCCMD_R_SPECIAL_BUTTONS, &value);
650 
651 	for (bit = 0; bit < 16; bit++) {
652 		if (test_bit(bit, &value)) {
653 			switch (bit) {
654 			case 0:	/* Z580 */
655 			case 6:	/* Z570 */
656 				/* Thermal Management button */
657 				ideapad_input_report(priv, 65);
658 				break;
659 			case 1:
660 				/* OneKey Theater button */
661 				ideapad_input_report(priv, 64);
662 				break;
663 			default:
664 				pr_info("Unknown special button: %lu\n", bit);
665 				break;
666 			}
667 		}
668 	}
669 }
670 
671 /*
672  * backlight
673  */
674 static int ideapad_backlight_get_brightness(struct backlight_device *blightdev)
675 {
676 	struct ideapad_private *priv = bl_get_data(blightdev);
677 	unsigned long now;
678 
679 	if (!priv)
680 		return -EINVAL;
681 
682 	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now))
683 		return -EIO;
684 	return now;
685 }
686 
687 static int ideapad_backlight_update_status(struct backlight_device *blightdev)
688 {
689 	struct ideapad_private *priv = bl_get_data(blightdev);
690 
691 	if (!priv)
692 		return -EINVAL;
693 
694 	if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL,
695 			 blightdev->props.brightness))
696 		return -EIO;
697 	if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL_POWER,
698 			 blightdev->props.power == FB_BLANK_POWERDOWN ? 0 : 1))
699 		return -EIO;
700 
701 	return 0;
702 }
703 
704 static const struct backlight_ops ideapad_backlight_ops = {
705 	.get_brightness = ideapad_backlight_get_brightness,
706 	.update_status = ideapad_backlight_update_status,
707 };
708 
709 static int ideapad_backlight_init(struct ideapad_private *priv)
710 {
711 	struct backlight_device *blightdev;
712 	struct backlight_properties props;
713 	unsigned long max, now, power;
714 
715 	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &max))
716 		return -EIO;
717 	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now))
718 		return -EIO;
719 	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power))
720 		return -EIO;
721 
722 	memset(&props, 0, sizeof(struct backlight_properties));
723 	props.max_brightness = max;
724 	props.type = BACKLIGHT_PLATFORM;
725 	blightdev = backlight_device_register("ideapad",
726 					      &priv->platform_device->dev,
727 					      priv,
728 					      &ideapad_backlight_ops,
729 					      &props);
730 	if (IS_ERR(blightdev)) {
731 		pr_err("Could not register backlight device\n");
732 		return PTR_ERR(blightdev);
733 	}
734 
735 	priv->blightdev = blightdev;
736 	blightdev->props.brightness = now;
737 	blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
738 	backlight_update_status(blightdev);
739 
740 	return 0;
741 }
742 
743 static void ideapad_backlight_exit(struct ideapad_private *priv)
744 {
745 	backlight_device_unregister(priv->blightdev);
746 	priv->blightdev = NULL;
747 }
748 
749 static void ideapad_backlight_notify_power(struct ideapad_private *priv)
750 {
751 	unsigned long power;
752 	struct backlight_device *blightdev = priv->blightdev;
753 
754 	if (!blightdev)
755 		return;
756 	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power))
757 		return;
758 	blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
759 }
760 
761 static void ideapad_backlight_notify_brightness(struct ideapad_private *priv)
762 {
763 	unsigned long now;
764 
765 	/* if we control brightness via acpi video driver */
766 	if (priv->blightdev == NULL) {
767 		read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now);
768 		return;
769 	}
770 
771 	backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY);
772 }
773 
774 /*
775  * module init/exit
776  */
777 static void ideapad_sync_touchpad_state(struct ideapad_private *priv)
778 {
779 	unsigned long value;
780 
781 	/* Without reading from EC touchpad LED doesn't switch state */
782 	if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value)) {
783 		/* Some IdeaPads don't really turn off touchpad - they only
784 		 * switch the LED state. We (de)activate KBC AUX port to turn
785 		 * touchpad off and on. We send KEY_TOUCHPAD_OFF and
786 		 * KEY_TOUCHPAD_ON to not to get out of sync with LED */
787 		unsigned char param;
788 		i8042_command(&param, value ? I8042_CMD_AUX_ENABLE :
789 			      I8042_CMD_AUX_DISABLE);
790 		ideapad_input_report(priv, value ? 67 : 66);
791 	}
792 }
793 
794 static void ideapad_acpi_notify(acpi_handle handle, u32 event, void *data)
795 {
796 	struct ideapad_private *priv = data;
797 	unsigned long vpc1, vpc2, vpc_bit;
798 
799 	if (read_ec_data(handle, VPCCMD_R_VPC1, &vpc1))
800 		return;
801 	if (read_ec_data(handle, VPCCMD_R_VPC2, &vpc2))
802 		return;
803 
804 	vpc1 = (vpc2 << 8) | vpc1;
805 	for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
806 		if (test_bit(vpc_bit, &vpc1)) {
807 			switch (vpc_bit) {
808 			case 9:
809 				ideapad_sync_rfk_state(priv);
810 				break;
811 			case 13:
812 			case 11:
813 			case 8:
814 			case 7:
815 			case 6:
816 				ideapad_input_report(priv, vpc_bit);
817 				break;
818 			case 5:
819 				ideapad_sync_touchpad_state(priv);
820 				break;
821 			case 4:
822 				ideapad_backlight_notify_brightness(priv);
823 				break;
824 			case 3:
825 				ideapad_input_novokey(priv);
826 				break;
827 			case 2:
828 				ideapad_backlight_notify_power(priv);
829 				break;
830 			case 0:
831 				ideapad_check_special_buttons(priv);
832 				break;
833 			default:
834 				pr_info("Unknown event: %lu\n", vpc_bit);
835 			}
836 		}
837 	}
838 }
839 
840 #if IS_ENABLED(CONFIG_ACPI_WMI)
841 static void ideapad_wmi_notify(u32 value, void *context)
842 {
843 	switch (value) {
844 	case 128:
845 		ideapad_input_report(context, value);
846 		break;
847 	default:
848 		pr_info("Unknown WMI event %u\n", value);
849 	}
850 }
851 #endif
852 
853 /*
854  * Some ideapads don't have a hardware rfkill switch, reading VPCCMD_R_RF
855  * always results in 0 on these models, causing ideapad_laptop to wrongly
856  * report all radios as hardware-blocked.
857  */
858 static const struct dmi_system_id no_hw_rfkill_list[] = {
859 	{
860 		.ident = "Lenovo G40-30",
861 		.matches = {
862 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
863 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo G40-30"),
864 		},
865 	},
866 	{
867 		.ident = "Lenovo G50-30",
868 		.matches = {
869 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
870 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo G50-30"),
871 		},
872 	},
873 	{
874 		.ident = "Lenovo ideapad Y700-15ISK",
875 		.matches = {
876 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
877 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad Y700-15ISK"),
878 		},
879 	},
880 	{
881 		.ident = "Lenovo ideapad Y700 Touch-15ISK",
882 		.matches = {
883 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
884 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad Y700 Touch-15ISK"),
885 		},
886 	},
887 	{
888 		.ident = "Lenovo ideapad Y700-17ISK",
889 		.matches = {
890 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
891 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad Y700-17ISK"),
892 		},
893 	},
894 	{
895 		.ident = "Lenovo Yoga 2 11 / 13 / Pro",
896 		.matches = {
897 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
898 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2"),
899 		},
900 	},
901 	{
902 		.ident = "Lenovo Yoga 2 11 / 13 / Pro",
903 		.matches = {
904 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
905 			DMI_MATCH(DMI_BOARD_NAME, "Yoga2"),
906 		},
907 	},
908 	{
909 		.ident = "Lenovo Yoga 3 1170 / 1470",
910 		.matches = {
911 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
912 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 3"),
913 		},
914 	},
915 	{
916 		.ident = "Lenovo Yoga 3 Pro 1370",
917 		.matches = {
918 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
919 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 3"),
920 		},
921 	},
922 	{
923 		.ident = "Lenovo Yoga 700",
924 		.matches = {
925 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
926 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 700"),
927 		},
928 	},
929 	{
930 		.ident = "Lenovo Yoga 900",
931 		.matches = {
932 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
933 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 900"),
934 		},
935 	},
936 	{
937 		.ident = "Lenovo Yoga 900",
938 		.matches = {
939 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
940 			DMI_MATCH(DMI_BOARD_NAME, "VIUU4"),
941 		},
942 	},
943 	{
944 		.ident = "Lenovo YOGA 910-13IKB",
945 		.matches = {
946 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
947 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 910-13IKB"),
948 		},
949 	},
950 	{}
951 };
952 
953 static int ideapad_acpi_add(struct platform_device *pdev)
954 {
955 	int ret, i;
956 	int cfg;
957 	struct ideapad_private *priv;
958 	struct acpi_device *adev;
959 
960 	ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
961 	if (ret)
962 		return -ENODEV;
963 
964 	if (read_method_int(adev->handle, "_CFG", &cfg))
965 		return -ENODEV;
966 
967 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
968 	if (!priv)
969 		return -ENOMEM;
970 
971 	dev_set_drvdata(&pdev->dev, priv);
972 	priv->cfg = cfg;
973 	priv->adev = adev;
974 	priv->platform_device = pdev;
975 	priv->has_hw_rfkill_switch = !dmi_check_system(no_hw_rfkill_list);
976 
977 	ret = ideapad_sysfs_init(priv);
978 	if (ret)
979 		return ret;
980 
981 	ret = ideapad_debugfs_init(priv);
982 	if (ret)
983 		goto debugfs_failed;
984 
985 	ret = ideapad_input_init(priv);
986 	if (ret)
987 		goto input_failed;
988 
989 	/*
990 	 * On some models without a hw-switch (the yoga 2 13 at least)
991 	 * VPCCMD_W_RF must be explicitly set to 1 for the wifi to work.
992 	 */
993 	if (!priv->has_hw_rfkill_switch)
994 		write_ec_cmd(priv->adev->handle, VPCCMD_W_RF, 1);
995 
996 	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
997 		if (test_bit(ideapad_rfk_data[i].cfgbit, &priv->cfg))
998 			ideapad_register_rfkill(priv, i);
999 
1000 	ideapad_sync_rfk_state(priv);
1001 	ideapad_sync_touchpad_state(priv);
1002 
1003 	if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
1004 		ret = ideapad_backlight_init(priv);
1005 		if (ret && ret != -ENODEV)
1006 			goto backlight_failed;
1007 	}
1008 	ret = acpi_install_notify_handler(adev->handle,
1009 		ACPI_DEVICE_NOTIFY, ideapad_acpi_notify, priv);
1010 	if (ret)
1011 		goto notification_failed;
1012 
1013 #if IS_ENABLED(CONFIG_ACPI_WMI)
1014 	for (i = 0; i < ARRAY_SIZE(ideapad_wmi_fnesc_events); i++) {
1015 		ret = wmi_install_notify_handler(ideapad_wmi_fnesc_events[i],
1016 						 ideapad_wmi_notify, priv);
1017 		if (ret == AE_OK) {
1018 			priv->fnesc_guid = ideapad_wmi_fnesc_events[i];
1019 			break;
1020 		}
1021 	}
1022 	if (ret != AE_OK && ret != AE_NOT_EXIST)
1023 		goto notification_failed_wmi;
1024 #endif
1025 
1026 	return 0;
1027 #if IS_ENABLED(CONFIG_ACPI_WMI)
1028 notification_failed_wmi:
1029 	acpi_remove_notify_handler(priv->adev->handle,
1030 		ACPI_DEVICE_NOTIFY, ideapad_acpi_notify);
1031 #endif
1032 notification_failed:
1033 	ideapad_backlight_exit(priv);
1034 backlight_failed:
1035 	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
1036 		ideapad_unregister_rfkill(priv, i);
1037 	ideapad_input_exit(priv);
1038 input_failed:
1039 	ideapad_debugfs_exit(priv);
1040 debugfs_failed:
1041 	ideapad_sysfs_exit(priv);
1042 	return ret;
1043 }
1044 
1045 static int ideapad_acpi_remove(struct platform_device *pdev)
1046 {
1047 	struct ideapad_private *priv = dev_get_drvdata(&pdev->dev);
1048 	int i;
1049 
1050 #if IS_ENABLED(CONFIG_ACPI_WMI)
1051 	if (priv->fnesc_guid)
1052 		wmi_remove_notify_handler(priv->fnesc_guid);
1053 #endif
1054 	acpi_remove_notify_handler(priv->adev->handle,
1055 		ACPI_DEVICE_NOTIFY, ideapad_acpi_notify);
1056 	ideapad_backlight_exit(priv);
1057 	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
1058 		ideapad_unregister_rfkill(priv, i);
1059 	ideapad_input_exit(priv);
1060 	ideapad_debugfs_exit(priv);
1061 	ideapad_sysfs_exit(priv);
1062 	dev_set_drvdata(&pdev->dev, NULL);
1063 
1064 	return 0;
1065 }
1066 
1067 #ifdef CONFIG_PM_SLEEP
1068 static int ideapad_acpi_resume(struct device *device)
1069 {
1070 	struct ideapad_private *priv;
1071 
1072 	if (!device)
1073 		return -EINVAL;
1074 	priv = dev_get_drvdata(device);
1075 
1076 	ideapad_sync_rfk_state(priv);
1077 	ideapad_sync_touchpad_state(priv);
1078 	return 0;
1079 }
1080 #endif
1081 static SIMPLE_DEV_PM_OPS(ideapad_pm, NULL, ideapad_acpi_resume);
1082 
1083 static const struct acpi_device_id ideapad_device_ids[] = {
1084 	{ "VPC2004", 0},
1085 	{ "", 0},
1086 };
1087 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
1088 
1089 static struct platform_driver ideapad_acpi_driver = {
1090 	.probe = ideapad_acpi_add,
1091 	.remove = ideapad_acpi_remove,
1092 	.driver = {
1093 		.name   = "ideapad_acpi",
1094 		.pm     = &ideapad_pm,
1095 		.acpi_match_table = ACPI_PTR(ideapad_device_ids),
1096 	},
1097 };
1098 
1099 module_platform_driver(ideapad_acpi_driver);
1100 
1101 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1102 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
1103 MODULE_LICENSE("GPL");
1104