1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Elan I2C/SMBus Touchpad driver
4  *
5  * Copyright (c) 2013 ELAN Microelectronics Corp.
6  *
7  * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
8  * Author: KT Liao <kt.liao@emc.com.tw>
9  * Version: 1.6.3
10  *
11  * Based on cyapa driver:
12  * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
13  * copyright (c) 2011-2012 Google, Inc.
14  *
15  * Trademarks are the property of their respective owners.
16  */
17 
18 #include <linux/acpi.h>
19 #include <linux/delay.h>
20 #include <linux/device.h>
21 #include <linux/firmware.h>
22 #include <linux/i2c.h>
23 #include <linux/init.h>
24 #include <linux/input/mt.h>
25 #include <linux/interrupt.h>
26 #include <linux/irq.h>
27 #include <linux/module.h>
28 #include <linux/slab.h>
29 #include <linux/kernel.h>
30 #include <linux/sched.h>
31 #include <linux/input.h>
32 #include <linux/uaccess.h>
33 #include <linux/jiffies.h>
34 #include <linux/completion.h>
35 #include <linux/of.h>
36 #include <linux/pm_wakeirq.h>
37 #include <linux/property.h>
38 #include <linux/regulator/consumer.h>
39 #include <asm/unaligned.h>
40 
41 #include "elan_i2c.h"
42 
43 #define DRIVER_NAME		"elan_i2c"
44 #define ELAN_VENDOR_ID		0x04f3
45 #define ETP_MAX_PRESSURE	255
46 #define ETP_FWIDTH_REDUCE	90
47 #define ETP_FINGER_WIDTH	15
48 #define ETP_RETRY_COUNT		3
49 
50 /* quirks to control the device */
51 #define ETP_QUIRK_QUICK_WAKEUP	BIT(0)
52 
53 /* The main device structure */
54 struct elan_tp_data {
55 	struct i2c_client	*client;
56 	struct input_dev	*input;
57 	struct input_dev	*tp_input; /* trackpoint input node */
58 	struct regulator	*vcc;
59 
60 	const struct elan_transport_ops *ops;
61 
62 	/* for fw update */
63 	struct completion	fw_completion;
64 	bool			in_fw_update;
65 
66 	struct mutex		sysfs_mutex;
67 
68 	unsigned int		max_x;
69 	unsigned int		max_y;
70 	unsigned int		width_x;
71 	unsigned int		width_y;
72 	unsigned int		x_res;
73 	unsigned int		y_res;
74 
75 	u8			pattern;
76 	u16			product_id;
77 	u8			fw_version;
78 	u8			sm_version;
79 	u8			iap_version;
80 	u16			fw_checksum;
81 	unsigned int		report_features;
82 	unsigned int		report_len;
83 	int			pressure_adjustment;
84 	u8			mode;
85 	u16			ic_type;
86 	u16			fw_validpage_count;
87 	u16			fw_page_size;
88 	u32			fw_signature_address;
89 
90 	u8			min_baseline;
91 	u8			max_baseline;
92 	bool			baseline_ready;
93 	u8			clickpad;
94 	bool			middle_button;
95 
96 	u32			quirks;		/* Various quirks */
97 };
98 
elan_i2c_lookup_quirks(u16 ic_type,u16 product_id)99 static u32 elan_i2c_lookup_quirks(u16 ic_type, u16 product_id)
100 {
101 	static const struct {
102 		u16 ic_type;
103 		u16 product_id;
104 		u32 quirks;
105 	} elan_i2c_quirks[] = {
106 		{ 0x0D, ETP_PRODUCT_ID_DELBIN, ETP_QUIRK_QUICK_WAKEUP },
107 		{ 0x0D, ETP_PRODUCT_ID_WHITEBOX, ETP_QUIRK_QUICK_WAKEUP },
108 		{ 0x10, ETP_PRODUCT_ID_VOXEL, ETP_QUIRK_QUICK_WAKEUP },
109 		{ 0x14, ETP_PRODUCT_ID_MAGPIE, ETP_QUIRK_QUICK_WAKEUP },
110 		{ 0x14, ETP_PRODUCT_ID_BOBBA, ETP_QUIRK_QUICK_WAKEUP },
111 	};
112 	u32 quirks = 0;
113 	int i;
114 
115 	for (i = 0; i < ARRAY_SIZE(elan_i2c_quirks); i++) {
116 		if (elan_i2c_quirks[i].ic_type == ic_type &&
117 		    elan_i2c_quirks[i].product_id == product_id) {
118 			quirks = elan_i2c_quirks[i].quirks;
119 		}
120 	}
121 
122 	if (ic_type >= 0x0D && product_id >= 0x123)
123 		quirks |= ETP_QUIRK_QUICK_WAKEUP;
124 
125 	return quirks;
126 }
127 
elan_get_fwinfo(u16 ic_type,u8 iap_version,u16 * validpage_count,u32 * signature_address,u16 * page_size)128 static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
129 			   u32 *signature_address, u16 *page_size)
130 {
131 	switch (ic_type) {
132 	case 0x00:
133 	case 0x06:
134 	case 0x08:
135 		*validpage_count = 512;
136 		break;
137 	case 0x03:
138 	case 0x07:
139 	case 0x09:
140 	case 0x0A:
141 	case 0x0B:
142 	case 0x0C:
143 		*validpage_count = 768;
144 		break;
145 	case 0x0D:
146 		*validpage_count = 896;
147 		break;
148 	case 0x0E:
149 		*validpage_count = 640;
150 		break;
151 	case 0x10:
152 		*validpage_count = 1024;
153 		break;
154 	case 0x11:
155 		*validpage_count = 1280;
156 		break;
157 	case 0x13:
158 		*validpage_count = 2048;
159 		break;
160 	case 0x14:
161 	case 0x15:
162 		*validpage_count = 1024;
163 		break;
164 	default:
165 		/* unknown ic type clear value */
166 		*validpage_count = 0;
167 		*signature_address = 0;
168 		*page_size = 0;
169 		return -ENXIO;
170 	}
171 
172 	*signature_address =
173 		(*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
174 
175 	if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) {
176 		*validpage_count /= 8;
177 		*page_size = ETP_FW_PAGE_SIZE_512;
178 	} else if (ic_type >= 0x0D && iap_version >= 1) {
179 		*validpage_count /= 2;
180 		*page_size = ETP_FW_PAGE_SIZE_128;
181 	} else {
182 		*page_size = ETP_FW_PAGE_SIZE;
183 	}
184 
185 	return 0;
186 }
187 
elan_set_power(struct elan_tp_data * data,bool on)188 static int elan_set_power(struct elan_tp_data *data, bool on)
189 {
190 	int repeat = ETP_RETRY_COUNT;
191 	int error;
192 
193 	do {
194 		error = data->ops->power_control(data->client, on);
195 		if (error >= 0)
196 			return 0;
197 
198 		msleep(30);
199 	} while (--repeat > 0);
200 
201 	dev_err(&data->client->dev, "failed to set power %s: %d\n",
202 		on ? "on" : "off", error);
203 	return error;
204 }
205 
elan_sleep(struct elan_tp_data * data)206 static int elan_sleep(struct elan_tp_data *data)
207 {
208 	int repeat = ETP_RETRY_COUNT;
209 	int error;
210 
211 	do {
212 		error = data->ops->sleep_control(data->client, true);
213 		if (!error)
214 			return 0;
215 
216 		msleep(30);
217 	} while (--repeat > 0);
218 
219 	return error;
220 }
221 
elan_query_product(struct elan_tp_data * data)222 static int elan_query_product(struct elan_tp_data *data)
223 {
224 	int error;
225 
226 	error = data->ops->get_product_id(data->client, &data->product_id);
227 	if (error)
228 		return error;
229 
230 	error = data->ops->get_pattern(data->client, &data->pattern);
231 	if (error)
232 		return error;
233 
234 	error = data->ops->get_sm_version(data->client, data->pattern,
235 					  &data->ic_type, &data->sm_version,
236 					  &data->clickpad);
237 	if (error)
238 		return error;
239 
240 	return 0;
241 }
242 
elan_check_ASUS_special_fw(struct elan_tp_data * data)243 static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
244 {
245 	if (data->ic_type == 0x0E) {
246 		switch (data->product_id) {
247 		case 0x05 ... 0x07:
248 		case 0x09:
249 		case 0x13:
250 			return true;
251 		}
252 	} else if (data->ic_type == 0x08 && data->product_id == 0x26) {
253 		/* ASUS EeeBook X205TA */
254 		return true;
255 	}
256 
257 	return false;
258 }
259 
__elan_initialize(struct elan_tp_data * data,bool skip_reset)260 static int __elan_initialize(struct elan_tp_data *data, bool skip_reset)
261 {
262 	struct i2c_client *client = data->client;
263 	bool woken_up = false;
264 	int error;
265 
266 	if (!skip_reset) {
267 		error = data->ops->initialize(client);
268 		if (error) {
269 			dev_err(&client->dev, "device initialize failed: %d\n", error);
270 			return error;
271 		}
272 	}
273 
274 	error = elan_query_product(data);
275 	if (error)
276 		return error;
277 
278 	/*
279 	 * Some ASUS devices were shipped with firmware that requires
280 	 * touchpads to be woken up first, before attempting to switch
281 	 * them into absolute reporting mode.
282 	 */
283 	if (elan_check_ASUS_special_fw(data)) {
284 		error = data->ops->sleep_control(client, false);
285 		if (error) {
286 			dev_err(&client->dev,
287 				"failed to wake device up: %d\n", error);
288 			return error;
289 		}
290 
291 		msleep(200);
292 		woken_up = true;
293 	}
294 
295 	data->mode |= ETP_ENABLE_ABS;
296 	error = data->ops->set_mode(client, data->mode);
297 	if (error) {
298 		dev_err(&client->dev,
299 			"failed to switch to absolute mode: %d\n", error);
300 		return error;
301 	}
302 
303 	if (!woken_up) {
304 		error = data->ops->sleep_control(client, false);
305 		if (error) {
306 			dev_err(&client->dev,
307 				"failed to wake device up: %d\n", error);
308 			return error;
309 		}
310 	}
311 
312 	return 0;
313 }
314 
elan_initialize(struct elan_tp_data * data,bool skip_reset)315 static int elan_initialize(struct elan_tp_data *data, bool skip_reset)
316 {
317 	int repeat = ETP_RETRY_COUNT;
318 	int error;
319 
320 	do {
321 		error = __elan_initialize(data, skip_reset);
322 		if (!error)
323 			return 0;
324 
325 		skip_reset = false;
326 		msleep(30);
327 	} while (--repeat > 0);
328 
329 	return error;
330 }
331 
elan_query_device_info(struct elan_tp_data * data)332 static int elan_query_device_info(struct elan_tp_data *data)
333 {
334 	int error;
335 
336 	error = data->ops->get_version(data->client, data->pattern, false,
337 				       &data->fw_version);
338 	if (error)
339 		return error;
340 
341 	error = data->ops->get_checksum(data->client, false,
342 					&data->fw_checksum);
343 	if (error)
344 		return error;
345 
346 	error = data->ops->get_version(data->client, data->pattern,
347 				       true, &data->iap_version);
348 	if (error)
349 		return error;
350 
351 	error = data->ops->get_pressure_adjustment(data->client,
352 						   &data->pressure_adjustment);
353 	if (error)
354 		return error;
355 
356 	error = data->ops->get_report_features(data->client, data->pattern,
357 					       &data->report_features,
358 					       &data->report_len);
359 	if (error)
360 		return error;
361 
362 	data->quirks = elan_i2c_lookup_quirks(data->ic_type, data->product_id);
363 
364 	error = elan_get_fwinfo(data->ic_type, data->iap_version,
365 				&data->fw_validpage_count,
366 				&data->fw_signature_address,
367 				&data->fw_page_size);
368 	if (error)
369 		dev_warn(&data->client->dev,
370 			 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
371 			 data->iap_version, data->ic_type);
372 
373 	return 0;
374 }
375 
elan_convert_resolution(u8 val,u8 pattern)376 static unsigned int elan_convert_resolution(u8 val, u8 pattern)
377 {
378 	/*
379 	 * pattern <= 0x01:
380 	 *	(value from firmware) * 10 + 790 = dpi
381 	 * else
382 	 *	((value from firmware) + 3) * 100 = dpi
383 	 */
384 	int res = pattern <= 0x01 ?
385 		(int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100;
386 	/*
387 	 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
388 	 * point).
389 	 */
390 	return res * 10 / 254;
391 }
392 
elan_query_device_parameters(struct elan_tp_data * data)393 static int elan_query_device_parameters(struct elan_tp_data *data)
394 {
395 	struct i2c_client *client = data->client;
396 	unsigned int x_traces, y_traces;
397 	u32 x_mm, y_mm;
398 	u8 hw_x_res, hw_y_res;
399 	int error;
400 
401 	if (device_property_read_u32(&client->dev,
402 				     "touchscreen-size-x", &data->max_x) ||
403 	    device_property_read_u32(&client->dev,
404 				     "touchscreen-size-y", &data->max_y)) {
405 		error = data->ops->get_max(data->client,
406 					   &data->max_x,
407 					   &data->max_y);
408 		if (error)
409 			return error;
410 	} else {
411 		/* size is the maximum + 1 */
412 		--data->max_x;
413 		--data->max_y;
414 	}
415 
416 	if (device_property_read_u32(&client->dev,
417 				     "elan,x_traces",
418 				     &x_traces) ||
419 	    device_property_read_u32(&client->dev,
420 				     "elan,y_traces",
421 				     &y_traces)) {
422 		error = data->ops->get_num_traces(data->client,
423 						  &x_traces, &y_traces);
424 		if (error)
425 			return error;
426 	}
427 	data->width_x = data->max_x / x_traces;
428 	data->width_y = data->max_y / y_traces;
429 
430 	if (device_property_read_u32(&client->dev,
431 				     "touchscreen-x-mm", &x_mm) ||
432 	    device_property_read_u32(&client->dev,
433 				     "touchscreen-y-mm", &y_mm)) {
434 		error = data->ops->get_resolution(data->client,
435 						  &hw_x_res, &hw_y_res);
436 		if (error)
437 			return error;
438 
439 		data->x_res = elan_convert_resolution(hw_x_res, data->pattern);
440 		data->y_res = elan_convert_resolution(hw_y_res, data->pattern);
441 	} else {
442 		data->x_res = (data->max_x + 1) / x_mm;
443 		data->y_res = (data->max_y + 1) / y_mm;
444 	}
445 
446 	if (device_property_read_bool(&client->dev, "elan,clickpad"))
447 		data->clickpad = 1;
448 
449 	if (device_property_read_bool(&client->dev, "elan,middle-button"))
450 		data->middle_button = true;
451 
452 	return 0;
453 }
454 
455 /*
456  **********************************************************
457  * IAP firmware updater related routines
458  **********************************************************
459  */
elan_write_fw_block(struct elan_tp_data * data,u16 page_size,const u8 * page,u16 checksum,int idx)460 static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size,
461 			       const u8 *page, u16 checksum, int idx)
462 {
463 	int retry = ETP_RETRY_COUNT;
464 	int error;
465 
466 	do {
467 		error = data->ops->write_fw_block(data->client, page_size,
468 						  page, checksum, idx);
469 		if (!error)
470 			return 0;
471 
472 		dev_dbg(&data->client->dev,
473 			"IAP retrying page %d (error: %d)\n", idx, error);
474 	} while (--retry > 0);
475 
476 	return error;
477 }
478 
__elan_update_firmware(struct elan_tp_data * data,const struct firmware * fw)479 static int __elan_update_firmware(struct elan_tp_data *data,
480 				  const struct firmware *fw)
481 {
482 	struct i2c_client *client = data->client;
483 	struct device *dev = &client->dev;
484 	int i, j;
485 	int error;
486 	u16 iap_start_addr;
487 	u16 boot_page_count;
488 	u16 sw_checksum = 0, fw_checksum = 0;
489 
490 	error = data->ops->prepare_fw_update(client, data->ic_type,
491 					     data->iap_version,
492 					     data->fw_page_size);
493 	if (error)
494 		return error;
495 
496 	iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
497 
498 	boot_page_count = (iap_start_addr * 2) / data->fw_page_size;
499 	for (i = boot_page_count; i < data->fw_validpage_count; i++) {
500 		u16 checksum = 0;
501 		const u8 *page = &fw->data[i * data->fw_page_size];
502 
503 		for (j = 0; j < data->fw_page_size; j += 2)
504 			checksum += ((page[j + 1] << 8) | page[j]);
505 
506 		error = elan_write_fw_block(data, data->fw_page_size,
507 					    page, checksum, i);
508 		if (error) {
509 			dev_err(dev, "write page %d fail: %d\n", i, error);
510 			return error;
511 		}
512 
513 		sw_checksum += checksum;
514 	}
515 
516 	/* Wait WDT reset and power on reset */
517 	msleep(600);
518 
519 	error = data->ops->finish_fw_update(client, &data->fw_completion);
520 	if (error)
521 		return error;
522 
523 	error = data->ops->get_checksum(client, true, &fw_checksum);
524 	if (error)
525 		return error;
526 
527 	if (sw_checksum != fw_checksum) {
528 		dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
529 			sw_checksum, fw_checksum);
530 		return -EIO;
531 	}
532 
533 	return 0;
534 }
535 
elan_update_firmware(struct elan_tp_data * data,const struct firmware * fw)536 static int elan_update_firmware(struct elan_tp_data *data,
537 				const struct firmware *fw)
538 {
539 	struct i2c_client *client = data->client;
540 	int retval;
541 
542 	dev_dbg(&client->dev, "Starting firmware update....\n");
543 
544 	disable_irq(client->irq);
545 	data->in_fw_update = true;
546 
547 	retval = __elan_update_firmware(data, fw);
548 	if (retval) {
549 		dev_err(&client->dev, "firmware update failed: %d\n", retval);
550 		data->ops->iap_reset(client);
551 	} else {
552 		/* Reinitialize TP after fw is updated */
553 		elan_initialize(data, false);
554 		elan_query_device_info(data);
555 	}
556 
557 	data->in_fw_update = false;
558 	enable_irq(client->irq);
559 
560 	return retval;
561 }
562 
563 /*
564  *******************************************************************
565  * SYSFS attributes
566  *******************************************************************
567  */
elan_sysfs_read_fw_checksum(struct device * dev,struct device_attribute * attr,char * buf)568 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
569 					   struct device_attribute *attr,
570 					   char *buf)
571 {
572 	struct i2c_client *client = to_i2c_client(dev);
573 	struct elan_tp_data *data = i2c_get_clientdata(client);
574 
575 	return sprintf(buf, "0x%04x\n", data->fw_checksum);
576 }
577 
elan_sysfs_read_product_id(struct device * dev,struct device_attribute * attr,char * buf)578 static ssize_t elan_sysfs_read_product_id(struct device *dev,
579 					 struct device_attribute *attr,
580 					 char *buf)
581 {
582 	struct i2c_client *client = to_i2c_client(dev);
583 	struct elan_tp_data *data = i2c_get_clientdata(client);
584 
585 	return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
586 		       data->product_id);
587 }
588 
elan_sysfs_read_fw_ver(struct device * dev,struct device_attribute * attr,char * buf)589 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
590 				      struct device_attribute *attr,
591 				      char *buf)
592 {
593 	struct i2c_client *client = to_i2c_client(dev);
594 	struct elan_tp_data *data = i2c_get_clientdata(client);
595 
596 	return sprintf(buf, "%d.0\n", data->fw_version);
597 }
598 
elan_sysfs_read_sm_ver(struct device * dev,struct device_attribute * attr,char * buf)599 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
600 				      struct device_attribute *attr,
601 				      char *buf)
602 {
603 	struct i2c_client *client = to_i2c_client(dev);
604 	struct elan_tp_data *data = i2c_get_clientdata(client);
605 
606 	return sprintf(buf, "%d.0\n", data->sm_version);
607 }
608 
elan_sysfs_read_iap_ver(struct device * dev,struct device_attribute * attr,char * buf)609 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
610 				       struct device_attribute *attr,
611 				       char *buf)
612 {
613 	struct i2c_client *client = to_i2c_client(dev);
614 	struct elan_tp_data *data = i2c_get_clientdata(client);
615 
616 	return sprintf(buf, "%d.0\n", data->iap_version);
617 }
618 
elan_sysfs_update_fw(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)619 static ssize_t elan_sysfs_update_fw(struct device *dev,
620 				    struct device_attribute *attr,
621 				    const char *buf, size_t count)
622 {
623 	struct elan_tp_data *data = dev_get_drvdata(dev);
624 	const struct firmware *fw;
625 	char *fw_name;
626 	int error;
627 	const u8 *fw_signature;
628 	static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
629 
630 	if (data->fw_validpage_count == 0)
631 		return -EINVAL;
632 
633 	/* Look for a firmware with the product id appended. */
634 	fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
635 	if (!fw_name) {
636 		dev_err(dev, "failed to allocate memory for firmware name\n");
637 		return -ENOMEM;
638 	}
639 
640 	dev_info(dev, "requesting fw '%s'\n", fw_name);
641 	error = request_firmware(&fw, fw_name, dev);
642 	kfree(fw_name);
643 	if (error) {
644 		dev_err(dev, "failed to request firmware: %d\n", error);
645 		return error;
646 	}
647 
648 	/* Firmware file must match signature data */
649 	fw_signature = &fw->data[data->fw_signature_address];
650 	if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
651 		dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
652 			(int)sizeof(signature), signature,
653 			(int)sizeof(signature), fw_signature);
654 		error = -EBADF;
655 		goto out_release_fw;
656 	}
657 
658 	error = mutex_lock_interruptible(&data->sysfs_mutex);
659 	if (error)
660 		goto out_release_fw;
661 
662 	error = elan_update_firmware(data, fw);
663 
664 	mutex_unlock(&data->sysfs_mutex);
665 
666 out_release_fw:
667 	release_firmware(fw);
668 	return error ?: count;
669 }
670 
calibrate_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)671 static ssize_t calibrate_store(struct device *dev,
672 			       struct device_attribute *attr,
673 			       const char *buf, size_t count)
674 {
675 	struct i2c_client *client = to_i2c_client(dev);
676 	struct elan_tp_data *data = i2c_get_clientdata(client);
677 	int tries = 20;
678 	int retval;
679 	int error;
680 	u8 val[ETP_CALIBRATE_MAX_LEN];
681 
682 	retval = mutex_lock_interruptible(&data->sysfs_mutex);
683 	if (retval)
684 		return retval;
685 
686 	disable_irq(client->irq);
687 
688 	data->mode |= ETP_ENABLE_CALIBRATE;
689 	retval = data->ops->set_mode(client, data->mode);
690 	if (retval) {
691 		dev_err(dev, "failed to enable calibration mode: %d\n",
692 			retval);
693 		goto out;
694 	}
695 
696 	retval = data->ops->calibrate(client);
697 	if (retval) {
698 		dev_err(dev, "failed to start calibration: %d\n",
699 			retval);
700 		goto out_disable_calibrate;
701 	}
702 
703 	val[0] = 0xff;
704 	do {
705 		/* Wait 250ms before checking if calibration has completed. */
706 		msleep(250);
707 
708 		retval = data->ops->calibrate_result(client, val);
709 		if (retval)
710 			dev_err(dev, "failed to check calibration result: %d\n",
711 				retval);
712 		else if (val[0] == 0)
713 			break; /* calibration done */
714 
715 	} while (--tries);
716 
717 	if (tries == 0) {
718 		dev_err(dev, "failed to calibrate. Timeout.\n");
719 		retval = -ETIMEDOUT;
720 	}
721 
722 out_disable_calibrate:
723 	data->mode &= ~ETP_ENABLE_CALIBRATE;
724 	error = data->ops->set_mode(data->client, data->mode);
725 	if (error) {
726 		dev_err(dev, "failed to disable calibration mode: %d\n",
727 			error);
728 		if (!retval)
729 			retval = error;
730 	}
731 out:
732 	enable_irq(client->irq);
733 	mutex_unlock(&data->sysfs_mutex);
734 	return retval ?: count;
735 }
736 
elan_sysfs_read_mode(struct device * dev,struct device_attribute * attr,char * buf)737 static ssize_t elan_sysfs_read_mode(struct device *dev,
738 				    struct device_attribute *attr,
739 				    char *buf)
740 {
741 	struct i2c_client *client = to_i2c_client(dev);
742 	struct elan_tp_data *data = i2c_get_clientdata(client);
743 	int error;
744 	enum tp_mode mode;
745 
746 	error = mutex_lock_interruptible(&data->sysfs_mutex);
747 	if (error)
748 		return error;
749 
750 	error = data->ops->iap_get_mode(data->client, &mode);
751 
752 	mutex_unlock(&data->sysfs_mutex);
753 
754 	if (error)
755 		return error;
756 
757 	return sprintf(buf, "%d\n", (int)mode);
758 }
759 
760 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
761 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
762 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
763 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
764 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
765 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
766 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
767 
768 static DEVICE_ATTR_WO(calibrate);
769 
770 static struct attribute *elan_sysfs_entries[] = {
771 	&dev_attr_product_id.attr,
772 	&dev_attr_firmware_version.attr,
773 	&dev_attr_sample_version.attr,
774 	&dev_attr_iap_version.attr,
775 	&dev_attr_fw_checksum.attr,
776 	&dev_attr_calibrate.attr,
777 	&dev_attr_mode.attr,
778 	&dev_attr_update_fw.attr,
779 	NULL,
780 };
781 
782 static const struct attribute_group elan_sysfs_group = {
783 	.attrs = elan_sysfs_entries,
784 };
785 
acquire_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)786 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
787 			     const char *buf, size_t count)
788 {
789 	struct i2c_client *client = to_i2c_client(dev);
790 	struct elan_tp_data *data = i2c_get_clientdata(client);
791 	int error;
792 	int retval;
793 
794 	retval = mutex_lock_interruptible(&data->sysfs_mutex);
795 	if (retval)
796 		return retval;
797 
798 	disable_irq(client->irq);
799 
800 	data->baseline_ready = false;
801 
802 	data->mode |= ETP_ENABLE_CALIBRATE;
803 	retval = data->ops->set_mode(data->client, data->mode);
804 	if (retval) {
805 		dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
806 			retval);
807 		goto out;
808 	}
809 
810 	msleep(250);
811 
812 	retval = data->ops->get_baseline_data(data->client, true,
813 					      &data->max_baseline);
814 	if (retval) {
815 		dev_err(dev, "Failed to read max baseline form device: %d\n",
816 			retval);
817 		goto out_disable_calibrate;
818 	}
819 
820 	retval = data->ops->get_baseline_data(data->client, false,
821 					      &data->min_baseline);
822 	if (retval) {
823 		dev_err(dev, "Failed to read min baseline form device: %d\n",
824 			retval);
825 		goto out_disable_calibrate;
826 	}
827 
828 	data->baseline_ready = true;
829 
830 out_disable_calibrate:
831 	data->mode &= ~ETP_ENABLE_CALIBRATE;
832 	error = data->ops->set_mode(data->client, data->mode);
833 	if (error) {
834 		dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
835 			error);
836 		if (!retval)
837 			retval = error;
838 	}
839 out:
840 	enable_irq(client->irq);
841 	mutex_unlock(&data->sysfs_mutex);
842 	return retval ?: count;
843 }
844 
min_show(struct device * dev,struct device_attribute * attr,char * buf)845 static ssize_t min_show(struct device *dev,
846 			struct device_attribute *attr, char *buf)
847 {
848 	struct i2c_client *client = to_i2c_client(dev);
849 	struct elan_tp_data *data = i2c_get_clientdata(client);
850 	int retval;
851 
852 	retval = mutex_lock_interruptible(&data->sysfs_mutex);
853 	if (retval)
854 		return retval;
855 
856 	if (!data->baseline_ready) {
857 		retval = -ENODATA;
858 		goto out;
859 	}
860 
861 	retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
862 
863 out:
864 	mutex_unlock(&data->sysfs_mutex);
865 	return retval;
866 }
867 
max_show(struct device * dev,struct device_attribute * attr,char * buf)868 static ssize_t max_show(struct device *dev,
869 			struct device_attribute *attr, char *buf)
870 {
871 	struct i2c_client *client = to_i2c_client(dev);
872 	struct elan_tp_data *data = i2c_get_clientdata(client);
873 	int retval;
874 
875 	retval = mutex_lock_interruptible(&data->sysfs_mutex);
876 	if (retval)
877 		return retval;
878 
879 	if (!data->baseline_ready) {
880 		retval = -ENODATA;
881 		goto out;
882 	}
883 
884 	retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
885 
886 out:
887 	mutex_unlock(&data->sysfs_mutex);
888 	return retval;
889 }
890 
891 
892 static DEVICE_ATTR_WO(acquire);
893 static DEVICE_ATTR_RO(min);
894 static DEVICE_ATTR_RO(max);
895 
896 static struct attribute *elan_baseline_sysfs_entries[] = {
897 	&dev_attr_acquire.attr,
898 	&dev_attr_min.attr,
899 	&dev_attr_max.attr,
900 	NULL,
901 };
902 
903 static const struct attribute_group elan_baseline_sysfs_group = {
904 	.name = "baseline",
905 	.attrs = elan_baseline_sysfs_entries,
906 };
907 
908 static const struct attribute_group *elan_sysfs_groups[] = {
909 	&elan_sysfs_group,
910 	&elan_baseline_sysfs_group,
911 	NULL
912 };
913 
914 /*
915  ******************************************************************
916  * Elan isr functions
917  ******************************************************************
918  */
elan_report_contact(struct elan_tp_data * data,int contact_num,bool contact_valid,bool high_precision,u8 * packet,u8 * finger_data)919 static void elan_report_contact(struct elan_tp_data *data, int contact_num,
920 				bool contact_valid, bool high_precision,
921 				u8 *packet, u8 *finger_data)
922 {
923 	struct input_dev *input = data->input;
924 	unsigned int pos_x, pos_y;
925 	unsigned int pressure, scaled_pressure;
926 
927 	if (contact_valid) {
928 		if (high_precision) {
929 			pos_x = get_unaligned_be16(&finger_data[0]);
930 			pos_y = get_unaligned_be16(&finger_data[2]);
931 		} else {
932 			pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
933 			pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
934 		}
935 
936 		if (pos_x > data->max_x || pos_y > data->max_y) {
937 			dev_dbg(input->dev.parent,
938 				"[%d] x=%d y=%d over max (%d, %d)",
939 				contact_num, pos_x, pos_y,
940 				data->max_x, data->max_y);
941 			return;
942 		}
943 
944 		pressure = finger_data[4];
945 		scaled_pressure = pressure + data->pressure_adjustment;
946 		if (scaled_pressure > ETP_MAX_PRESSURE)
947 			scaled_pressure = ETP_MAX_PRESSURE;
948 
949 		input_mt_slot(input, contact_num);
950 		input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
951 		input_report_abs(input, ABS_MT_POSITION_X, pos_x);
952 		input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
953 		input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
954 
955 		if (data->report_features & ETP_FEATURE_REPORT_MK) {
956 			unsigned int mk_x, mk_y, area_x, area_y;
957 			u8 mk_data = high_precision ?
958 				packet[ETP_MK_DATA_OFFSET + contact_num] :
959 				finger_data[3];
960 
961 			mk_x = mk_data & 0x0f;
962 			mk_y = mk_data >> 4;
963 
964 			/*
965 			 * To avoid treating large finger as palm, let's reduce
966 			 * the width x and y per trace.
967 			 */
968 			area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
969 			area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
970 
971 			input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
972 			input_report_abs(input, ABS_MT_TOUCH_MAJOR,
973 					 max(area_x, area_y));
974 			input_report_abs(input, ABS_MT_TOUCH_MINOR,
975 					 min(area_x, area_y));
976 		}
977 	} else {
978 		input_mt_slot(input, contact_num);
979 		input_mt_report_slot_inactive(input);
980 	}
981 }
982 
elan_report_absolute(struct elan_tp_data * data,u8 * packet,bool high_precision)983 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
984 				 bool high_precision)
985 {
986 	struct input_dev *input = data->input;
987 	u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
988 	int i;
989 	u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
990 	u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
991 	bool contact_valid, hover_event;
992 
993 	pm_wakeup_event(&data->client->dev, 0);
994 
995 	hover_event = hover_info & BIT(6);
996 
997 	for (i = 0; i < ETP_MAX_FINGERS; i++) {
998 		contact_valid = tp_info & BIT(3 + i);
999 		elan_report_contact(data, i, contact_valid, high_precision,
1000 				    packet, finger_data);
1001 		if (contact_valid)
1002 			finger_data += ETP_FINGER_DATA_LEN;
1003 	}
1004 
1005 	input_report_key(input, BTN_LEFT,   tp_info & BIT(0));
1006 	input_report_key(input, BTN_MIDDLE, tp_info & BIT(2));
1007 	input_report_key(input, BTN_RIGHT,  tp_info & BIT(1));
1008 	input_report_abs(input, ABS_DISTANCE, hover_event != 0);
1009 	input_mt_report_pointer_emulation(input, true);
1010 	input_sync(input);
1011 }
1012 
elan_report_trackpoint(struct elan_tp_data * data,u8 * report)1013 static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
1014 {
1015 	struct input_dev *input = data->tp_input;
1016 	u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
1017 	int x, y;
1018 
1019 	pm_wakeup_event(&data->client->dev, 0);
1020 
1021 	if (!data->tp_input) {
1022 		dev_warn_once(&data->client->dev,
1023 			      "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n");
1024 		return;
1025 	}
1026 
1027 	input_report_key(input, BTN_LEFT, packet[0] & 0x01);
1028 	input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
1029 	input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
1030 
1031 	if ((packet[3] & 0x0F) == 0x06) {
1032 		x = packet[4] - (int)((packet[1] ^ 0x80) << 1);
1033 		y = (int)((packet[2] ^ 0x80) << 1) - packet[5];
1034 
1035 		input_report_rel(input, REL_X, x);
1036 		input_report_rel(input, REL_Y, y);
1037 	}
1038 
1039 	input_sync(input);
1040 }
1041 
elan_isr(int irq,void * dev_id)1042 static irqreturn_t elan_isr(int irq, void *dev_id)
1043 {
1044 	struct elan_tp_data *data = dev_id;
1045 	int error;
1046 	u8 report[ETP_MAX_REPORT_LEN];
1047 
1048 	/*
1049 	 * When device is connected to i2c bus, when all IAP page writes
1050 	 * complete, the driver will receive interrupt and must read
1051 	 * 0000 to confirm that IAP is finished.
1052 	*/
1053 	if (data->in_fw_update) {
1054 		complete(&data->fw_completion);
1055 		goto out;
1056 	}
1057 
1058 	error = data->ops->get_report(data->client, report, data->report_len);
1059 	if (error)
1060 		goto out;
1061 
1062 	switch (report[ETP_REPORT_ID_OFFSET]) {
1063 	case ETP_REPORT_ID:
1064 		elan_report_absolute(data, report, false);
1065 		break;
1066 	case ETP_REPORT_ID2:
1067 		elan_report_absolute(data, report, true);
1068 		break;
1069 	case ETP_TP_REPORT_ID:
1070 	case ETP_TP_REPORT_ID2:
1071 		elan_report_trackpoint(data, report);
1072 		break;
1073 	default:
1074 		dev_err(&data->client->dev, "invalid report id data (%x)\n",
1075 			report[ETP_REPORT_ID_OFFSET]);
1076 	}
1077 
1078 out:
1079 	return IRQ_HANDLED;
1080 }
1081 
1082 /*
1083  ******************************************************************
1084  * Elan initialization functions
1085  ******************************************************************
1086  */
1087 
elan_setup_trackpoint_input_device(struct elan_tp_data * data)1088 static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
1089 {
1090 	struct device *dev = &data->client->dev;
1091 	struct input_dev *input;
1092 
1093 	input = devm_input_allocate_device(dev);
1094 	if (!input)
1095 		return -ENOMEM;
1096 
1097 	input->name = "Elan TrackPoint";
1098 	input->id.bustype = BUS_I2C;
1099 	input->id.vendor = ELAN_VENDOR_ID;
1100 	input->id.product = data->product_id;
1101 	input_set_drvdata(input, data);
1102 
1103 	input_set_capability(input, EV_REL, REL_X);
1104 	input_set_capability(input, EV_REL, REL_Y);
1105 	input_set_capability(input, EV_KEY, BTN_LEFT);
1106 	input_set_capability(input, EV_KEY, BTN_RIGHT);
1107 	input_set_capability(input, EV_KEY, BTN_MIDDLE);
1108 
1109 	__set_bit(INPUT_PROP_POINTER, input->propbit);
1110 	__set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
1111 
1112 	data->tp_input = input;
1113 
1114 	return 0;
1115 }
1116 
elan_setup_input_device(struct elan_tp_data * data)1117 static int elan_setup_input_device(struct elan_tp_data *data)
1118 {
1119 	struct device *dev = &data->client->dev;
1120 	struct input_dev *input;
1121 	unsigned int max_width = max(data->width_x, data->width_y);
1122 	unsigned int min_width = min(data->width_x, data->width_y);
1123 	int error;
1124 
1125 	input = devm_input_allocate_device(dev);
1126 	if (!input)
1127 		return -ENOMEM;
1128 
1129 	input->name = "Elan Touchpad";
1130 	input->id.bustype = BUS_I2C;
1131 	input->id.vendor = ELAN_VENDOR_ID;
1132 	input->id.product = data->product_id;
1133 	input_set_drvdata(input, data);
1134 
1135 	error = input_mt_init_slots(input, ETP_MAX_FINGERS,
1136 				    INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
1137 	if (error) {
1138 		dev_err(dev, "failed to initialize MT slots: %d\n", error);
1139 		return error;
1140 	}
1141 
1142 	__set_bit(EV_ABS, input->evbit);
1143 	__set_bit(INPUT_PROP_POINTER, input->propbit);
1144 	if (data->clickpad) {
1145 		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1146 	} else {
1147 		__set_bit(BTN_RIGHT, input->keybit);
1148 		if (data->middle_button)
1149 			__set_bit(BTN_MIDDLE, input->keybit);
1150 	}
1151 	__set_bit(BTN_LEFT, input->keybit);
1152 
1153 	/* Set up ST parameters */
1154 	input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1155 	input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1156 	input_abs_set_res(input, ABS_X, data->x_res);
1157 	input_abs_set_res(input, ABS_Y, data->y_res);
1158 	input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1159 	if (data->report_features & ETP_FEATURE_REPORT_MK)
1160 		input_set_abs_params(input, ABS_TOOL_WIDTH,
1161 				     0, ETP_FINGER_WIDTH, 0, 0);
1162 	input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1163 
1164 	/* And MT parameters */
1165 	input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1166 	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1167 	input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1168 	input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1169 	input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1170 			     ETP_MAX_PRESSURE, 0, 0);
1171 	if (data->report_features & ETP_FEATURE_REPORT_MK) {
1172 		input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1173 				     0, ETP_FINGER_WIDTH * max_width, 0, 0);
1174 		input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1175 				     0, ETP_FINGER_WIDTH * min_width, 0, 0);
1176 	}
1177 
1178 	data->input = input;
1179 
1180 	return 0;
1181 }
1182 
elan_disable_regulator(void * _data)1183 static void elan_disable_regulator(void *_data)
1184 {
1185 	struct elan_tp_data *data = _data;
1186 
1187 	regulator_disable(data->vcc);
1188 }
1189 
elan_probe(struct i2c_client * client)1190 static int elan_probe(struct i2c_client *client)
1191 {
1192 	const struct elan_transport_ops *transport_ops;
1193 	struct device *dev = &client->dev;
1194 	struct elan_tp_data *data;
1195 	unsigned long irqflags;
1196 	int error;
1197 
1198 	if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1199 	    i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1200 		transport_ops = &elan_i2c_ops;
1201 	} else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1202 		   i2c_check_functionality(client->adapter,
1203 					   I2C_FUNC_SMBUS_BYTE_DATA |
1204 						I2C_FUNC_SMBUS_BLOCK_DATA |
1205 						I2C_FUNC_SMBUS_I2C_BLOCK)) {
1206 		transport_ops = &elan_smbus_ops;
1207 	} else {
1208 		dev_err(dev, "not a supported I2C/SMBus adapter\n");
1209 		return -EIO;
1210 	}
1211 
1212 	data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1213 	if (!data)
1214 		return -ENOMEM;
1215 
1216 	i2c_set_clientdata(client, data);
1217 
1218 	data->ops = transport_ops;
1219 	data->client = client;
1220 	init_completion(&data->fw_completion);
1221 	mutex_init(&data->sysfs_mutex);
1222 
1223 	data->vcc = devm_regulator_get(dev, "vcc");
1224 	if (IS_ERR(data->vcc))
1225 		return dev_err_probe(dev, PTR_ERR(data->vcc), "Failed to get 'vcc' regulator\n");
1226 
1227 	error = regulator_enable(data->vcc);
1228 	if (error) {
1229 		dev_err(dev, "Failed to enable regulator: %d\n", error);
1230 		return error;
1231 	}
1232 
1233 	error = devm_add_action_or_reset(dev, elan_disable_regulator, data);
1234 	if (error) {
1235 		dev_err(dev, "Failed to add disable regulator action: %d\n",
1236 			error);
1237 		return error;
1238 	}
1239 
1240 	/* Make sure there is something at this address */
1241 	error = i2c_smbus_read_byte(client);
1242 	if (error < 0) {
1243 		dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1244 		return -ENXIO;
1245 	}
1246 
1247 	/* Initialize the touchpad. */
1248 	error = elan_initialize(data, false);
1249 	if (error)
1250 		return error;
1251 
1252 	error = elan_query_device_info(data);
1253 	if (error)
1254 		return error;
1255 
1256 	error = elan_query_device_parameters(data);
1257 	if (error)
1258 		return error;
1259 
1260 	dev_info(dev,
1261 		 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1262 		 data->product_id,
1263 		 data->fw_version,
1264 		 data->sm_version,
1265 		 data->iap_version);
1266 
1267 	dev_dbg(dev,
1268 		"Elan Touchpad Extra Information:\n"
1269 		"    Max ABS X,Y:   %d,%d\n"
1270 		"    Width X,Y:   %d,%d\n"
1271 		"    Resolution X,Y:   %d,%d (dots/mm)\n"
1272 		"    ic type: 0x%x\n"
1273 		"    info pattern: 0x%x\n",
1274 		data->max_x, data->max_y,
1275 		data->width_x, data->width_y,
1276 		data->x_res, data->y_res,
1277 		data->ic_type, data->pattern);
1278 
1279 	/* Set up input device properties based on queried parameters. */
1280 	error = elan_setup_input_device(data);
1281 	if (error)
1282 		return error;
1283 
1284 	if (device_property_read_bool(&client->dev, "elan,trackpoint")) {
1285 		error = elan_setup_trackpoint_input_device(data);
1286 		if (error)
1287 			return error;
1288 	}
1289 
1290 	/*
1291 	 * Platform code (ACPI, DTS) should normally set up interrupt
1292 	 * for us, but in case it did not let's fall back to using falling
1293 	 * edge to be compatible with older Chromebooks.
1294 	 */
1295 	irqflags = irq_get_trigger_type(client->irq);
1296 	if (!irqflags)
1297 		irqflags = IRQF_TRIGGER_FALLING;
1298 
1299 	error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1300 					  irqflags | IRQF_ONESHOT,
1301 					  client->name, data);
1302 	if (error) {
1303 		dev_err(dev, "cannot register irq=%d\n", client->irq);
1304 		return error;
1305 	}
1306 
1307 	error = input_register_device(data->input);
1308 	if (error) {
1309 		dev_err(dev, "failed to register input device: %d\n", error);
1310 		return error;
1311 	}
1312 
1313 	if (data->tp_input) {
1314 		error = input_register_device(data->tp_input);
1315 		if (error) {
1316 			dev_err(&client->dev,
1317 				"failed to register TrackPoint input device: %d\n",
1318 				error);
1319 			return error;
1320 		}
1321 	}
1322 
1323 	return 0;
1324 }
1325 
elan_suspend(struct device * dev)1326 static int elan_suspend(struct device *dev)
1327 {
1328 	struct i2c_client *client = to_i2c_client(dev);
1329 	struct elan_tp_data *data = i2c_get_clientdata(client);
1330 	int ret;
1331 
1332 	/*
1333 	 * We are taking the mutex to make sure sysfs operations are
1334 	 * complete before we attempt to bring the device into low[er]
1335 	 * power mode.
1336 	 */
1337 	ret = mutex_lock_interruptible(&data->sysfs_mutex);
1338 	if (ret)
1339 		return ret;
1340 
1341 	disable_irq(client->irq);
1342 
1343 	if (device_may_wakeup(dev)) {
1344 		ret = elan_sleep(data);
1345 	} else {
1346 		ret = elan_set_power(data, false);
1347 		if (ret)
1348 			goto err;
1349 
1350 		ret = regulator_disable(data->vcc);
1351 		if (ret) {
1352 			dev_err(dev, "error %d disabling regulator\n", ret);
1353 			/* Attempt to power the chip back up */
1354 			elan_set_power(data, true);
1355 		}
1356 	}
1357 
1358 err:
1359 	mutex_unlock(&data->sysfs_mutex);
1360 	return ret;
1361 }
1362 
elan_resume(struct device * dev)1363 static int elan_resume(struct device *dev)
1364 {
1365 	struct i2c_client *client = to_i2c_client(dev);
1366 	struct elan_tp_data *data = i2c_get_clientdata(client);
1367 	int error;
1368 
1369 	if (!device_may_wakeup(dev)) {
1370 		error = regulator_enable(data->vcc);
1371 		if (error) {
1372 			dev_err(dev, "error %d enabling regulator\n", error);
1373 			goto err;
1374 		}
1375 	}
1376 
1377 	error = elan_set_power(data, true);
1378 	if (error) {
1379 		dev_err(dev, "power up when resuming failed: %d\n", error);
1380 		goto err;
1381 	}
1382 
1383 	error = elan_initialize(data, data->quirks & ETP_QUIRK_QUICK_WAKEUP);
1384 	if (error)
1385 		dev_err(dev, "initialize when resuming failed: %d\n", error);
1386 
1387 err:
1388 	enable_irq(data->client->irq);
1389 	return error;
1390 }
1391 
1392 static DEFINE_SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1393 
1394 static const struct i2c_device_id elan_id[] = {
1395 	{ DRIVER_NAME, 0 },
1396 	{ },
1397 };
1398 MODULE_DEVICE_TABLE(i2c, elan_id);
1399 
1400 #ifdef CONFIG_ACPI
1401 #include <linux/input/elan-i2c-ids.h>
1402 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1403 #endif
1404 
1405 #ifdef CONFIG_OF
1406 static const struct of_device_id elan_of_match[] = {
1407 	{ .compatible = "elan,ekth3000" },
1408 	{ /* sentinel */ }
1409 };
1410 MODULE_DEVICE_TABLE(of, elan_of_match);
1411 #endif
1412 
1413 static struct i2c_driver elan_driver = {
1414 	.driver = {
1415 		.name	= DRIVER_NAME,
1416 		.pm	= pm_sleep_ptr(&elan_pm_ops),
1417 		.acpi_match_table = ACPI_PTR(elan_acpi_id),
1418 		.of_match_table = of_match_ptr(elan_of_match),
1419 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1420 		.dev_groups = elan_sysfs_groups,
1421 	},
1422 	.probe		= elan_probe,
1423 	.id_table	= elan_id,
1424 };
1425 
1426 module_i2c_driver(elan_driver);
1427 
1428 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1429 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1430 MODULE_LICENSE("GPL");
1431