1 // SPDX-License-Identifier: GPL-2.0+
2 // Driver to instantiate Chromebook i2c/smbus devices.
3 //
4 // Copyright (C) 2012 Google, Inc.
5 // Author: Benson Leung <bleung@chromium.org>
6 
7 #define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt
8 
9 #include <linux/acpi.h>
10 #include <linux/dmi.h>
11 #include <linux/i2c.h>
12 #include <linux/input.h>
13 #include <linux/interrupt.h>
14 #include <linux/ioport.h>
15 #include <linux/module.h>
16 #include <linux/pci.h>
17 #include <linux/platform_device.h>
18 #include <linux/property.h>
19 
20 #define ATMEL_TP_I2C_ADDR	0x4b
21 #define ATMEL_TP_I2C_BL_ADDR	0x25
22 #define ATMEL_TS_I2C_ADDR	0x4a
23 #define ATMEL_TS_I2C_BL_ADDR	0x26
24 #define CYAPA_TP_I2C_ADDR	0x67
25 #define ELAN_TP_I2C_ADDR	0x15
26 #define ISL_ALS_I2C_ADDR	0x44
27 #define TAOS_ALS_I2C_ADDR	0x29
28 
29 static const char *i2c_adapter_names[] = {
30 	"SMBus I801 adapter",
31 	"i915 gmbus vga",
32 	"i915 gmbus panel",
33 	"Synopsys DesignWare I2C adapter",
34 };
35 
36 /* Keep this enum consistent with i2c_adapter_names */
37 enum i2c_adapter_type {
38 	I2C_ADAPTER_SMBUS = 0,
39 	I2C_ADAPTER_VGADDC,
40 	I2C_ADAPTER_PANEL,
41 	I2C_ADAPTER_DESIGNWARE,
42 };
43 
44 struct i2c_peripheral {
45 	struct i2c_board_info board_info;
46 	unsigned short alt_addr;
47 
48 	const char *dmi_name;
49 	unsigned long irqflags;
50 	struct resource irq_resource;
51 
52 	enum i2c_adapter_type type;
53 	u32 pci_devid;
54 
55 	const struct property_entry *properties;
56 
57 	struct i2c_client *client;
58 };
59 
60 struct acpi_peripheral {
61 	char hid[ACPI_ID_LEN];
62 	struct software_node swnode;
63 	struct i2c_client *client;
64 };
65 
66 struct chromeos_laptop {
67 	/*
68 	 * Note that we can't mark this pointer as const because
69 	 * i2c_new_scanned_device() changes passed in I2C board info, so.
70 	 */
71 	struct i2c_peripheral *i2c_peripherals;
72 	unsigned int num_i2c_peripherals;
73 
74 	struct acpi_peripheral *acpi_peripherals;
75 	unsigned int num_acpi_peripherals;
76 };
77 
78 static const struct chromeos_laptop *cros_laptop;
79 
80 static struct i2c_client *
chromes_laptop_instantiate_i2c_device(struct i2c_adapter * adapter,struct i2c_board_info * info,unsigned short alt_addr)81 chromes_laptop_instantiate_i2c_device(struct i2c_adapter *adapter,
82 				      struct i2c_board_info *info,
83 				      unsigned short alt_addr)
84 {
85 	const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
86 	struct i2c_client *client;
87 
88 	/*
89 	 * Add the i2c device. If we can't detect it at the primary
90 	 * address we scan secondary addresses. In any case the client
91 	 * structure gets assigned primary address.
92 	 */
93 	client = i2c_new_scanned_device(adapter, info, addr_list, NULL);
94 	if (IS_ERR(client) && alt_addr) {
95 		struct i2c_board_info dummy_info = {
96 			I2C_BOARD_INFO("dummy", info->addr),
97 		};
98 		const unsigned short alt_addr_list[] = {
99 			alt_addr, I2C_CLIENT_END
100 		};
101 		struct i2c_client *dummy;
102 
103 		dummy = i2c_new_scanned_device(adapter, &dummy_info,
104 					       alt_addr_list, NULL);
105 		if (!IS_ERR(dummy)) {
106 			pr_debug("%d-%02x is probed at %02x\n",
107 				 adapter->nr, info->addr, dummy->addr);
108 			i2c_unregister_device(dummy);
109 			client = i2c_new_client_device(adapter, info);
110 		}
111 	}
112 
113 	if (IS_ERR(client)) {
114 		client = NULL;
115 		pr_debug("failed to register device %d-%02x\n",
116 			 adapter->nr, info->addr);
117 	} else {
118 		pr_debug("added i2c device %d-%02x\n",
119 			 adapter->nr, info->addr);
120 	}
121 
122 	return client;
123 }
124 
chromeos_laptop_match_adapter_devid(struct device * dev,u32 devid)125 static bool chromeos_laptop_match_adapter_devid(struct device *dev, u32 devid)
126 {
127 	struct pci_dev *pdev;
128 
129 	if (!dev_is_pci(dev))
130 		return false;
131 
132 	pdev = to_pci_dev(dev);
133 	return devid == pci_dev_id(pdev);
134 }
135 
chromeos_laptop_check_adapter(struct i2c_adapter * adapter)136 static void chromeos_laptop_check_adapter(struct i2c_adapter *adapter)
137 {
138 	struct i2c_peripheral *i2c_dev;
139 	int i;
140 
141 	for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
142 		i2c_dev = &cros_laptop->i2c_peripherals[i];
143 
144 		/* Skip devices already created */
145 		if (i2c_dev->client)
146 			continue;
147 
148 		if (strncmp(adapter->name, i2c_adapter_names[i2c_dev->type],
149 			    strlen(i2c_adapter_names[i2c_dev->type])))
150 			continue;
151 
152 		if (i2c_dev->pci_devid &&
153 		    !chromeos_laptop_match_adapter_devid(adapter->dev.parent,
154 							 i2c_dev->pci_devid)) {
155 			continue;
156 		}
157 
158 		i2c_dev->client =
159 			chromes_laptop_instantiate_i2c_device(adapter,
160 							&i2c_dev->board_info,
161 							i2c_dev->alt_addr);
162 	}
163 }
164 
chromeos_laptop_adjust_client(struct i2c_client * client)165 static bool chromeos_laptop_adjust_client(struct i2c_client *client)
166 {
167 	struct acpi_peripheral *acpi_dev;
168 	struct acpi_device_id acpi_ids[2] = { };
169 	int i;
170 	int error;
171 
172 	if (!has_acpi_companion(&client->dev))
173 		return false;
174 
175 	for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
176 		acpi_dev = &cros_laptop->acpi_peripherals[i];
177 
178 		memcpy(acpi_ids[0].id, acpi_dev->hid, ACPI_ID_LEN);
179 
180 		if (acpi_match_device(acpi_ids, &client->dev)) {
181 			error = device_add_software_node(&client->dev, &acpi_dev->swnode);
182 			if (error) {
183 				dev_err(&client->dev,
184 					"failed to add properties: %d\n",
185 					error);
186 				break;
187 			}
188 
189 			acpi_dev->client = client;
190 
191 			return true;
192 		}
193 	}
194 
195 	return false;
196 }
197 
chromeos_laptop_detach_i2c_client(struct i2c_client * client)198 static void chromeos_laptop_detach_i2c_client(struct i2c_client *client)
199 {
200 	struct acpi_peripheral *acpi_dev;
201 	struct i2c_peripheral *i2c_dev;
202 	int i;
203 
204 	if (has_acpi_companion(&client->dev))
205 		for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
206 			acpi_dev = &cros_laptop->acpi_peripherals[i];
207 
208 			if (acpi_dev->client == client) {
209 				acpi_dev->client = NULL;
210 				return;
211 			}
212 		}
213 	else
214 		for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
215 			i2c_dev = &cros_laptop->i2c_peripherals[i];
216 
217 			if (i2c_dev->client == client) {
218 				i2c_dev->client = NULL;
219 				return;
220 			}
221 		}
222 }
223 
chromeos_laptop_i2c_notifier_call(struct notifier_block * nb,unsigned long action,void * data)224 static int chromeos_laptop_i2c_notifier_call(struct notifier_block *nb,
225 					     unsigned long action, void *data)
226 {
227 	struct device *dev = data;
228 
229 	switch (action) {
230 	case BUS_NOTIFY_ADD_DEVICE:
231 		if (dev->type == &i2c_adapter_type)
232 			chromeos_laptop_check_adapter(to_i2c_adapter(dev));
233 		else if (dev->type == &i2c_client_type)
234 			chromeos_laptop_adjust_client(to_i2c_client(dev));
235 		break;
236 
237 	case BUS_NOTIFY_REMOVED_DEVICE:
238 		if (dev->type == &i2c_client_type)
239 			chromeos_laptop_detach_i2c_client(to_i2c_client(dev));
240 		break;
241 	}
242 
243 	return 0;
244 }
245 
246 static struct notifier_block chromeos_laptop_i2c_notifier = {
247 	.notifier_call = chromeos_laptop_i2c_notifier_call,
248 };
249 
250 #define DECLARE_CROS_LAPTOP(_name)					\
251 static const struct chromeos_laptop _name __initconst = {		\
252 	.i2c_peripherals	= _name##_peripherals,			\
253 	.num_i2c_peripherals	= ARRAY_SIZE(_name##_peripherals),	\
254 }
255 
256 #define DECLARE_ACPI_CROS_LAPTOP(_name)					\
257 static const struct chromeos_laptop _name __initconst = {		\
258 	.acpi_peripherals	= _name##_peripherals,			\
259 	.num_acpi_peripherals	= ARRAY_SIZE(_name##_peripherals),	\
260 }
261 
262 static struct i2c_peripheral samsung_series_5_550_peripherals[] __initdata = {
263 	/* Touchpad. */
264 	{
265 		.board_info	= {
266 			I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
267 			.flags		= I2C_CLIENT_WAKE,
268 		},
269 		.dmi_name	= "trackpad",
270 		.type		= I2C_ADAPTER_SMBUS,
271 	},
272 	/* Light Sensor. */
273 	{
274 		.board_info	= {
275 			I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
276 		},
277 		.dmi_name	= "lightsensor",
278 		.type		= I2C_ADAPTER_SMBUS,
279 	},
280 };
281 DECLARE_CROS_LAPTOP(samsung_series_5_550);
282 
283 static struct i2c_peripheral samsung_series_5_peripherals[] __initdata = {
284 	/* Light Sensor. */
285 	{
286 		.board_info	= {
287 			I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
288 		},
289 		.type		= I2C_ADAPTER_SMBUS,
290 	},
291 };
292 DECLARE_CROS_LAPTOP(samsung_series_5);
293 
294 static const int chromebook_pixel_tp_keys[] __initconst = {
295 	KEY_RESERVED,
296 	KEY_RESERVED,
297 	KEY_RESERVED,
298 	KEY_RESERVED,
299 	KEY_RESERVED,
300 	BTN_LEFT
301 };
302 
303 static const struct property_entry
304 chromebook_pixel_trackpad_props[] __initconst = {
305 	PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
306 	PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", chromebook_pixel_tp_keys),
307 	{ }
308 };
309 
310 static const struct property_entry
311 chromebook_atmel_touchscreen_props[] __initconst = {
312 	PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
313 	{ }
314 };
315 
316 static struct i2c_peripheral chromebook_pixel_peripherals[] __initdata = {
317 	/* Touch Screen. */
318 	{
319 		.board_info	= {
320 			I2C_BOARD_INFO("atmel_mxt_ts",
321 					ATMEL_TS_I2C_ADDR),
322 			.flags		= I2C_CLIENT_WAKE,
323 		},
324 		.dmi_name	= "touchscreen",
325 		.irqflags	= IRQF_TRIGGER_FALLING,
326 		.type		= I2C_ADAPTER_PANEL,
327 		.alt_addr	= ATMEL_TS_I2C_BL_ADDR,
328 		.properties	= chromebook_atmel_touchscreen_props,
329 	},
330 	/* Touchpad. */
331 	{
332 		.board_info	= {
333 			I2C_BOARD_INFO("atmel_mxt_tp",
334 					ATMEL_TP_I2C_ADDR),
335 			.flags		= I2C_CLIENT_WAKE,
336 		},
337 		.dmi_name	= "trackpad",
338 		.irqflags	= IRQF_TRIGGER_FALLING,
339 		.type		= I2C_ADAPTER_VGADDC,
340 		.alt_addr	= ATMEL_TP_I2C_BL_ADDR,
341 		.properties	= chromebook_pixel_trackpad_props,
342 	},
343 	/* Light Sensor. */
344 	{
345 		.board_info	= {
346 			I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
347 		},
348 		.dmi_name	= "lightsensor",
349 		.type		= I2C_ADAPTER_PANEL,
350 	},
351 };
352 DECLARE_CROS_LAPTOP(chromebook_pixel);
353 
354 static struct i2c_peripheral hp_chromebook_14_peripherals[] __initdata = {
355 	/* Touchpad. */
356 	{
357 		.board_info	= {
358 			I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
359 			.flags		= I2C_CLIENT_WAKE,
360 		},
361 		.dmi_name	= "trackpad",
362 		.type		= I2C_ADAPTER_DESIGNWARE,
363 	},
364 };
365 DECLARE_CROS_LAPTOP(hp_chromebook_14);
366 
367 static struct i2c_peripheral dell_chromebook_11_peripherals[] __initdata = {
368 	/* Touchpad. */
369 	{
370 		.board_info	= {
371 			I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
372 			.flags		= I2C_CLIENT_WAKE,
373 		},
374 		.dmi_name	= "trackpad",
375 		.type		= I2C_ADAPTER_DESIGNWARE,
376 	},
377 	/* Elan Touchpad option. */
378 	{
379 		.board_info	= {
380 			I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
381 			.flags		= I2C_CLIENT_WAKE,
382 		},
383 		.dmi_name	= "trackpad",
384 		.type		= I2C_ADAPTER_DESIGNWARE,
385 	},
386 };
387 DECLARE_CROS_LAPTOP(dell_chromebook_11);
388 
389 static struct i2c_peripheral toshiba_cb35_peripherals[] __initdata = {
390 	/* Touchpad. */
391 	{
392 		.board_info	= {
393 			I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
394 			.flags		= I2C_CLIENT_WAKE,
395 		},
396 		.dmi_name	= "trackpad",
397 		.type		= I2C_ADAPTER_DESIGNWARE,
398 	},
399 };
400 DECLARE_CROS_LAPTOP(toshiba_cb35);
401 
402 static struct i2c_peripheral acer_c7_chromebook_peripherals[] __initdata = {
403 	/* Touchpad. */
404 	{
405 		.board_info	= {
406 			I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
407 			.flags		= I2C_CLIENT_WAKE,
408 		},
409 		.dmi_name	= "trackpad",
410 		.type		= I2C_ADAPTER_SMBUS,
411 	},
412 };
413 DECLARE_CROS_LAPTOP(acer_c7_chromebook);
414 
415 static struct i2c_peripheral acer_ac700_peripherals[] __initdata = {
416 	/* Light Sensor. */
417 	{
418 		.board_info	= {
419 			I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
420 		},
421 		.type		= I2C_ADAPTER_SMBUS,
422 	},
423 };
424 DECLARE_CROS_LAPTOP(acer_ac700);
425 
426 static struct i2c_peripheral acer_c720_peripherals[] __initdata = {
427 	/* Touchscreen. */
428 	{
429 		.board_info	= {
430 			I2C_BOARD_INFO("atmel_mxt_ts",
431 					ATMEL_TS_I2C_ADDR),
432 			.flags		= I2C_CLIENT_WAKE,
433 		},
434 		.dmi_name	= "touchscreen",
435 		.irqflags	= IRQF_TRIGGER_FALLING,
436 		.type		= I2C_ADAPTER_DESIGNWARE,
437 		.pci_devid	= PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
438 		.alt_addr	= ATMEL_TS_I2C_BL_ADDR,
439 		.properties	= chromebook_atmel_touchscreen_props,
440 	},
441 	/* Touchpad. */
442 	{
443 		.board_info	= {
444 			I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
445 			.flags		= I2C_CLIENT_WAKE,
446 		},
447 		.dmi_name	= "trackpad",
448 		.type		= I2C_ADAPTER_DESIGNWARE,
449 		.pci_devid	= PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
450 	},
451 	/* Elan Touchpad option. */
452 	{
453 		.board_info	= {
454 			I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
455 			.flags		= I2C_CLIENT_WAKE,
456 		},
457 		.dmi_name	= "trackpad",
458 		.type		= I2C_ADAPTER_DESIGNWARE,
459 		.pci_devid	= PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
460 	},
461 	/* Light Sensor. */
462 	{
463 		.board_info	= {
464 			I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
465 		},
466 		.dmi_name	= "lightsensor",
467 		.type		= I2C_ADAPTER_DESIGNWARE,
468 		.pci_devid	= PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
469 	},
470 };
471 DECLARE_CROS_LAPTOP(acer_c720);
472 
473 static struct i2c_peripheral
474 hp_pavilion_14_chromebook_peripherals[] __initdata = {
475 	/* Touchpad. */
476 	{
477 		.board_info	= {
478 			I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
479 			.flags		= I2C_CLIENT_WAKE,
480 		},
481 		.dmi_name	= "trackpad",
482 		.type		= I2C_ADAPTER_SMBUS,
483 	},
484 };
485 DECLARE_CROS_LAPTOP(hp_pavilion_14_chromebook);
486 
487 static struct i2c_peripheral cr48_peripherals[] __initdata = {
488 	/* Light Sensor. */
489 	{
490 		.board_info	= {
491 			I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
492 		},
493 		.type		= I2C_ADAPTER_SMBUS,
494 	},
495 };
496 DECLARE_CROS_LAPTOP(cr48);
497 
498 static const u32 samus_touchpad_buttons[] __initconst = {
499 	KEY_RESERVED,
500 	KEY_RESERVED,
501 	KEY_RESERVED,
502 	BTN_LEFT
503 };
504 
505 static const struct property_entry samus_trackpad_props[] __initconst = {
506 	PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
507 	PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", samus_touchpad_buttons),
508 	{ }
509 };
510 
511 static struct acpi_peripheral samus_peripherals[] __initdata = {
512 	/* Touchpad */
513 	{
514 		.hid		= "ATML0000",
515 		.swnode		= {
516 			.properties = samus_trackpad_props,
517 		},
518 	},
519 	/* Touchsceen */
520 	{
521 		.hid		= "ATML0001",
522 		.swnode		= {
523 			.properties = chromebook_atmel_touchscreen_props,
524 		},
525 	},
526 };
527 DECLARE_ACPI_CROS_LAPTOP(samus);
528 
529 static struct acpi_peripheral generic_atmel_peripherals[] __initdata = {
530 	/* Touchpad */
531 	{
532 		.hid		= "ATML0000",
533 		.swnode		= {
534 			.properties = chromebook_pixel_trackpad_props,
535 		},
536 	},
537 	/* Touchsceen */
538 	{
539 		.hid		= "ATML0001",
540 		.swnode		= {
541 			.properties = chromebook_atmel_touchscreen_props,
542 		},
543 	},
544 };
545 DECLARE_ACPI_CROS_LAPTOP(generic_atmel);
546 
547 static const struct dmi_system_id chromeos_laptop_dmi_table[] __initconst = {
548 	{
549 		.ident = "Samsung Series 5 550",
550 		.matches = {
551 			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
552 			DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
553 		},
554 		.driver_data = (void *)&samsung_series_5_550,
555 	},
556 	{
557 		.ident = "Samsung Series 5",
558 		.matches = {
559 			DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
560 		},
561 		.driver_data = (void *)&samsung_series_5,
562 	},
563 	{
564 		.ident = "Chromebook Pixel",
565 		.matches = {
566 			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
567 			DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
568 		},
569 		.driver_data = (void *)&chromebook_pixel,
570 	},
571 	{
572 		.ident = "Wolf",
573 		.matches = {
574 			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
575 			DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
576 		},
577 		.driver_data = (void *)&dell_chromebook_11,
578 	},
579 	{
580 		.ident = "HP Chromebook 14",
581 		.matches = {
582 			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
583 			DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
584 		},
585 		.driver_data = (void *)&hp_chromebook_14,
586 	},
587 	{
588 		.ident = "Toshiba CB35",
589 		.matches = {
590 			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
591 			DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
592 		},
593 		.driver_data = (void *)&toshiba_cb35,
594 	},
595 	{
596 		.ident = "Acer C7 Chromebook",
597 		.matches = {
598 			DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
599 		},
600 		.driver_data = (void *)&acer_c7_chromebook,
601 	},
602 	{
603 		.ident = "Acer AC700",
604 		.matches = {
605 			DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
606 		},
607 		.driver_data = (void *)&acer_ac700,
608 	},
609 	{
610 		.ident = "Acer C720",
611 		.matches = {
612 			DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
613 		},
614 		.driver_data = (void *)&acer_c720,
615 	},
616 	{
617 		.ident = "HP Pavilion 14 Chromebook",
618 		.matches = {
619 			DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
620 		},
621 		.driver_data = (void *)&hp_pavilion_14_chromebook,
622 	},
623 	{
624 		.ident = "Cr-48",
625 		.matches = {
626 			DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
627 		},
628 		.driver_data = (void *)&cr48,
629 	},
630 	/* Devices with peripherals incompletely described in ACPI */
631 	{
632 		.ident = "Chromebook Pro",
633 		.matches = {
634 			DMI_MATCH(DMI_SYS_VENDOR, "Google"),
635 			DMI_MATCH(DMI_PRODUCT_NAME, "Caroline"),
636 		},
637 		.driver_data = (void *)&samus,
638 	},
639 	{
640 		.ident = "Google Pixel 2 (2015)",
641 		.matches = {
642 			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
643 			DMI_MATCH(DMI_PRODUCT_NAME, "Samus"),
644 		},
645 		.driver_data = (void *)&samus,
646 	},
647 	{
648 		.ident = "Samsung Chromebook 3",
649 		.matches = {
650 			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
651 			DMI_MATCH(DMI_PRODUCT_NAME, "Celes"),
652 		},
653 		.driver_data = (void *)&samus,
654 	},
655 	{
656 		/*
657 		 * Other Chromebooks with Atmel touch controllers:
658 		 * - Winky (touchpad)
659 		 * - Clapper, Expresso, Rambi, Glimmer (touchscreen)
660 		 */
661 		.ident = "Other Chromebook",
662 		.matches = {
663 			/*
664 			 * This will match all Google devices, not only devices
665 			 * with Atmel, but we will validate that the device
666 			 * actually has matching peripherals.
667 			 */
668 			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
669 		},
670 		.driver_data = (void *)&generic_atmel,
671 	},
672 	{ }
673 };
674 MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
675 
chromeos_laptop_scan_peripherals(struct device * dev,void * data)676 static int __init chromeos_laptop_scan_peripherals(struct device *dev, void *data)
677 {
678 	int error;
679 
680 	if (dev->type == &i2c_adapter_type) {
681 		chromeos_laptop_check_adapter(to_i2c_adapter(dev));
682 	} else if (dev->type == &i2c_client_type) {
683 		if (chromeos_laptop_adjust_client(to_i2c_client(dev))) {
684 			/*
685 			 * Now that we have needed properties re-trigger
686 			 * driver probe in case driver was initialized
687 			 * earlier and probe failed.
688 			 */
689 			error = device_attach(dev);
690 			if (error < 0)
691 				dev_warn(dev,
692 					 "%s: device_attach() failed: %d\n",
693 					 __func__, error);
694 		}
695 	}
696 
697 	return 0;
698 }
699 
chromeos_laptop_get_irq_from_dmi(const char * dmi_name)700 static int __init chromeos_laptop_get_irq_from_dmi(const char *dmi_name)
701 {
702 	const struct dmi_device *dmi_dev;
703 	const struct dmi_dev_onboard *dev_data;
704 
705 	dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, dmi_name, NULL);
706 	if (!dmi_dev) {
707 		pr_err("failed to find DMI device '%s'\n", dmi_name);
708 		return -ENOENT;
709 	}
710 
711 	dev_data = dmi_dev->device_data;
712 	if (!dev_data) {
713 		pr_err("failed to get data from DMI for '%s'\n", dmi_name);
714 		return -EINVAL;
715 	}
716 
717 	return dev_data->instance;
718 }
719 
chromeos_laptop_setup_irq(struct i2c_peripheral * i2c_dev)720 static int __init chromeos_laptop_setup_irq(struct i2c_peripheral *i2c_dev)
721 {
722 	int irq;
723 
724 	if (i2c_dev->dmi_name) {
725 		irq = chromeos_laptop_get_irq_from_dmi(i2c_dev->dmi_name);
726 		if (irq < 0)
727 			return irq;
728 
729 		i2c_dev->irq_resource  = (struct resource)
730 			DEFINE_RES_NAMED(irq, 1, NULL,
731 					 IORESOURCE_IRQ | i2c_dev->irqflags);
732 		i2c_dev->board_info.resources = &i2c_dev->irq_resource;
733 		i2c_dev->board_info.num_resources = 1;
734 	}
735 
736 	return 0;
737 }
738 
739 static int __init
chromeos_laptop_prepare_i2c_peripherals(struct chromeos_laptop * cros_laptop,const struct chromeos_laptop * src)740 chromeos_laptop_prepare_i2c_peripherals(struct chromeos_laptop *cros_laptop,
741 					const struct chromeos_laptop *src)
742 {
743 	struct i2c_peripheral *i2c_peripherals;
744 	struct i2c_peripheral *i2c_dev;
745 	struct i2c_board_info *info;
746 	int i;
747 	int error;
748 
749 	if (!src->num_i2c_peripherals)
750 		return 0;
751 
752 	i2c_peripherals = kmemdup(src->i2c_peripherals,
753 					      src->num_i2c_peripherals *
754 					  sizeof(*src->i2c_peripherals),
755 					  GFP_KERNEL);
756 	if (!i2c_peripherals)
757 		return -ENOMEM;
758 
759 	for (i = 0; i < src->num_i2c_peripherals; i++) {
760 		i2c_dev = &i2c_peripherals[i];
761 		info = &i2c_dev->board_info;
762 
763 		error = chromeos_laptop_setup_irq(i2c_dev);
764 		if (error)
765 			goto err_out;
766 
767 		/* Create primary fwnode for the device - copies everything */
768 		if (i2c_dev->properties) {
769 			info->fwnode = fwnode_create_software_node(i2c_dev->properties, NULL);
770 			if (IS_ERR(info->fwnode)) {
771 				error = PTR_ERR(info->fwnode);
772 				goto err_out;
773 			}
774 		}
775 	}
776 
777 	cros_laptop->i2c_peripherals = i2c_peripherals;
778 	cros_laptop->num_i2c_peripherals = src->num_i2c_peripherals;
779 
780 	return 0;
781 
782 err_out:
783 	while (--i >= 0) {
784 		i2c_dev = &i2c_peripherals[i];
785 		info = &i2c_dev->board_info;
786 		if (!IS_ERR_OR_NULL(info->fwnode))
787 			fwnode_remove_software_node(info->fwnode);
788 	}
789 	kfree(i2c_peripherals);
790 	return error;
791 }
792 
793 static int __init
chromeos_laptop_prepare_acpi_peripherals(struct chromeos_laptop * cros_laptop,const struct chromeos_laptop * src)794 chromeos_laptop_prepare_acpi_peripherals(struct chromeos_laptop *cros_laptop,
795 					const struct chromeos_laptop *src)
796 {
797 	struct acpi_peripheral *acpi_peripherals;
798 	struct acpi_peripheral *acpi_dev;
799 	const struct acpi_peripheral *src_dev;
800 	int n_peripherals = 0;
801 	int i;
802 	int error;
803 
804 	for (i = 0; i < src->num_acpi_peripherals; i++) {
805 		if (acpi_dev_present(src->acpi_peripherals[i].hid, NULL, -1))
806 			n_peripherals++;
807 	}
808 
809 	if (!n_peripherals)
810 		return 0;
811 
812 	acpi_peripherals = kcalloc(n_peripherals,
813 				   sizeof(*src->acpi_peripherals),
814 				   GFP_KERNEL);
815 	if (!acpi_peripherals)
816 		return -ENOMEM;
817 
818 	acpi_dev = acpi_peripherals;
819 	for (i = 0; i < src->num_acpi_peripherals; i++) {
820 		src_dev = &src->acpi_peripherals[i];
821 		if (!acpi_dev_present(src_dev->hid, NULL, -1))
822 			continue;
823 
824 		*acpi_dev = *src_dev;
825 
826 		/* We need to deep-copy properties */
827 		if (src_dev->swnode.properties) {
828 			acpi_dev->swnode.properties =
829 				property_entries_dup(src_dev->swnode.properties);
830 			if (IS_ERR(acpi_dev->swnode.properties)) {
831 				error = PTR_ERR(acpi_dev->swnode.properties);
832 				goto err_out;
833 			}
834 		}
835 
836 		acpi_dev++;
837 	}
838 
839 	cros_laptop->acpi_peripherals = acpi_peripherals;
840 	cros_laptop->num_acpi_peripherals = n_peripherals;
841 
842 	return 0;
843 
844 err_out:
845 	while (--i >= 0) {
846 		acpi_dev = &acpi_peripherals[i];
847 		if (!IS_ERR_OR_NULL(acpi_dev->swnode.properties))
848 			property_entries_free(acpi_dev->swnode.properties);
849 	}
850 
851 	kfree(acpi_peripherals);
852 	return error;
853 }
854 
chromeos_laptop_destroy(const struct chromeos_laptop * cros_laptop)855 static void chromeos_laptop_destroy(const struct chromeos_laptop *cros_laptop)
856 {
857 	const struct acpi_peripheral *acpi_dev;
858 	struct i2c_peripheral *i2c_dev;
859 	int i;
860 
861 	for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
862 		i2c_dev = &cros_laptop->i2c_peripherals[i];
863 		i2c_unregister_device(i2c_dev->client);
864 	}
865 
866 	for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
867 		acpi_dev = &cros_laptop->acpi_peripherals[i];
868 
869 		if (acpi_dev->client)
870 			device_remove_software_node(&acpi_dev->client->dev);
871 
872 		property_entries_free(acpi_dev->swnode.properties);
873 	}
874 
875 	kfree(cros_laptop->i2c_peripherals);
876 	kfree(cros_laptop->acpi_peripherals);
877 	kfree(cros_laptop);
878 }
879 
880 static struct chromeos_laptop * __init
chromeos_laptop_prepare(const struct chromeos_laptop * src)881 chromeos_laptop_prepare(const struct chromeos_laptop *src)
882 {
883 	struct chromeos_laptop *cros_laptop;
884 	int error;
885 
886 	cros_laptop = kzalloc(sizeof(*cros_laptop), GFP_KERNEL);
887 	if (!cros_laptop)
888 		return ERR_PTR(-ENOMEM);
889 
890 	error = chromeos_laptop_prepare_i2c_peripherals(cros_laptop, src);
891 	if (!error)
892 		error = chromeos_laptop_prepare_acpi_peripherals(cros_laptop,
893 								 src);
894 
895 	if (error) {
896 		chromeos_laptop_destroy(cros_laptop);
897 		return ERR_PTR(error);
898 	}
899 
900 	return cros_laptop;
901 }
902 
chromeos_laptop_init(void)903 static int __init chromeos_laptop_init(void)
904 {
905 	const struct dmi_system_id *dmi_id;
906 	int error;
907 
908 	dmi_id = dmi_first_match(chromeos_laptop_dmi_table);
909 	if (!dmi_id) {
910 		pr_debug("unsupported system\n");
911 		return -ENODEV;
912 	}
913 
914 	pr_debug("DMI Matched %s\n", dmi_id->ident);
915 
916 	cros_laptop = chromeos_laptop_prepare((void *)dmi_id->driver_data);
917 	if (IS_ERR(cros_laptop))
918 		return PTR_ERR(cros_laptop);
919 
920 	if (!cros_laptop->num_i2c_peripherals &&
921 	    !cros_laptop->num_acpi_peripherals) {
922 		pr_debug("no relevant devices detected\n");
923 		error = -ENODEV;
924 		goto err_destroy_cros_laptop;
925 	}
926 
927 	error = bus_register_notifier(&i2c_bus_type,
928 				      &chromeos_laptop_i2c_notifier);
929 	if (error) {
930 		pr_err("failed to register i2c bus notifier: %d\n",
931 		       error);
932 		goto err_destroy_cros_laptop;
933 	}
934 
935 	/*
936 	 * Scan adapters that have been registered and clients that have
937 	 * been created before we installed the notifier to make sure
938 	 * we do not miss any devices.
939 	 */
940 	i2c_for_each_dev(NULL, chromeos_laptop_scan_peripherals);
941 
942 	return 0;
943 
944 err_destroy_cros_laptop:
945 	chromeos_laptop_destroy(cros_laptop);
946 	return error;
947 }
948 
chromeos_laptop_exit(void)949 static void __exit chromeos_laptop_exit(void)
950 {
951 	bus_unregister_notifier(&i2c_bus_type, &chromeos_laptop_i2c_notifier);
952 	chromeos_laptop_destroy(cros_laptop);
953 }
954 
955 module_init(chromeos_laptop_init);
956 module_exit(chromeos_laptop_exit);
957 
958 MODULE_DESCRIPTION("Chrome OS Laptop driver");
959 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
960 MODULE_LICENSE("GPL");
961