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
 29static 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 */
 37enum i2c_adapter_type {
 38	I2C_ADAPTER_SMBUS = 0,
 39	I2C_ADAPTER_VGADDC,
 40	I2C_ADAPTER_PANEL,
 41	I2C_ADAPTER_DESIGNWARE,
 42};
 43
 44struct 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
 60struct acpi_peripheral {
 61	char hid[ACPI_ID_LEN];
 62	struct software_node swnode;
 63	struct i2c_client *client;
 64};
 65
 66struct 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
 78static const struct chromeos_laptop *cros_laptop;
 79
 80static struct i2c_client *
 81chromes_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
125static 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
136static 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
165static 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
198static 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
224static 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
246static struct notifier_block chromeos_laptop_i2c_notifier = {
247	.notifier_call = chromeos_laptop_i2c_notifier_call,
248};
249
250#define DECLARE_CROS_LAPTOP(_name)					\
251static 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)					\
257static const struct chromeos_laptop _name __initconst = {		\
258	.acpi_peripherals	= _name##_peripherals,			\
259	.num_acpi_peripherals	= ARRAY_SIZE(_name##_peripherals),	\
260}
261
262static 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};
281DECLARE_CROS_LAPTOP(samsung_series_5_550);
282
283static 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};
292DECLARE_CROS_LAPTOP(samsung_series_5);
293
294static 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
303static const struct property_entry
304chromebook_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
310static const struct property_entry
311chromebook_atmel_touchscreen_props[] __initconst = {
312	PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
313	{ }
314};
315
316static 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};
352DECLARE_CROS_LAPTOP(chromebook_pixel);
353
354static 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};
365DECLARE_CROS_LAPTOP(hp_chromebook_14);
366
367static 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};
387DECLARE_CROS_LAPTOP(dell_chromebook_11);
388
389static 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};
400DECLARE_CROS_LAPTOP(toshiba_cb35);
401
402static 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};
413DECLARE_CROS_LAPTOP(acer_c7_chromebook);
414
415static 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};
424DECLARE_CROS_LAPTOP(acer_ac700);
425
426static 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};
471DECLARE_CROS_LAPTOP(acer_c720);
472
473static struct i2c_peripheral
474hp_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};
485DECLARE_CROS_LAPTOP(hp_pavilion_14_chromebook);
486
487static 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};
496DECLARE_CROS_LAPTOP(cr48);
497
498static const u32 samus_touchpad_buttons[] __initconst = {
499	KEY_RESERVED,
500	KEY_RESERVED,
501	KEY_RESERVED,
502	BTN_LEFT
503};
504
505static 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
511static 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};
527DECLARE_ACPI_CROS_LAPTOP(samus);
528
529static 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};
545DECLARE_ACPI_CROS_LAPTOP(generic_atmel);
546
547static 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};
674MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
675
676static 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
700static 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
720static 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
739static int __init
740chromeos_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
782err_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
793static int __init
794chromeos_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
844err_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
855static 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
880static struct chromeos_laptop * __init
881chromeos_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
903static 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
944err_destroy_cros_laptop:
945	chromeos_laptop_destroy(cros_laptop);
946	return error;
947}
948
949static 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
955module_init(chromeos_laptop_init);
956module_exit(chromeos_laptop_exit);
957
958MODULE_DESCRIPTION("Chrome OS Laptop driver");
959MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
960MODULE_LICENSE("GPL");