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