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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");
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/dmi.h>
10#include <linux/i2c.h>
11#include <linux/input.h>
12#include <linux/interrupt.h>
13#include <linux/ioport.h>
14#include <linux/module.h>
15#include <linux/pci.h>
16#include <linux/platform_device.h>
17#include <linux/property.h>
18
19#define ATMEL_TP_I2C_ADDR 0x4b
20#define ATMEL_TP_I2C_BL_ADDR 0x25
21#define ATMEL_TS_I2C_ADDR 0x4a
22#define ATMEL_TS_I2C_BL_ADDR 0x26
23#define CYAPA_TP_I2C_ADDR 0x67
24#define ELAN_TP_I2C_ADDR 0x15
25#define ISL_ALS_I2C_ADDR 0x44
26#define TAOS_ALS_I2C_ADDR 0x29
27
28static const char *i2c_adapter_names[] = {
29 "SMBus I801 adapter",
30 "i915 gmbus vga",
31 "i915 gmbus panel",
32 "Synopsys DesignWare I2C adapter",
33};
34
35/* Keep this enum consistent with i2c_adapter_names */
36enum i2c_adapter_type {
37 I2C_ADAPTER_SMBUS = 0,
38 I2C_ADAPTER_VGADDC,
39 I2C_ADAPTER_PANEL,
40 I2C_ADAPTER_DESIGNWARE,
41};
42
43struct i2c_peripheral {
44 struct i2c_board_info board_info;
45 unsigned short alt_addr;
46
47 const char *dmi_name;
48 unsigned long irqflags;
49 struct resource irq_resource;
50
51 enum i2c_adapter_type type;
52 u32 pci_devid;
53
54 struct i2c_client *client;
55};
56
57struct chromeos_laptop {
58 /*
59 * Note that we can't mark this pointer as const because
60 * i2c_new_probed_device() changes passed in I2C board info, so.
61 */
62 struct i2c_peripheral *i2c_peripherals;
63 unsigned int num_i2c_peripherals;
64};
65
66static const struct chromeos_laptop *cros_laptop;
67
68static struct i2c_client *
69chromes_laptop_instantiate_i2c_device(struct i2c_adapter *adapter,
70 struct i2c_board_info *info,
71 unsigned short alt_addr)
72{
73 const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
74 struct i2c_client *client;
75
76 /*
77 * Add the i2c device. If we can't detect it at the primary
78 * address we scan secondary addresses. In any case the client
79 * structure gets assigned primary address.
80 */
81 client = i2c_new_probed_device(adapter, info, addr_list, NULL);
82 if (!client && alt_addr) {
83 struct i2c_board_info dummy_info = {
84 I2C_BOARD_INFO("dummy", info->addr),
85 };
86 const unsigned short alt_addr_list[] = {
87 alt_addr, I2C_CLIENT_END
88 };
89 struct i2c_client *dummy;
90
91 dummy = i2c_new_probed_device(adapter, &dummy_info,
92 alt_addr_list, NULL);
93 if (dummy) {
94 pr_debug("%d-%02x is probed at %02x\n",
95 adapter->nr, info->addr, dummy->addr);
96 i2c_unregister_device(dummy);
97 client = i2c_new_device(adapter, info);
98 }
99 }
100
101 if (!client)
102 pr_debug("failed to register device %d-%02x\n",
103 adapter->nr, info->addr);
104 else
105 pr_debug("added i2c device %d-%02x\n",
106 adapter->nr, info->addr);
107
108 return client;
109}
110
111static bool chromeos_laptop_match_adapter_devid(struct device *dev, u32 devid)
112{
113 struct pci_dev *pdev;
114
115 if (!dev_is_pci(dev))
116 return false;
117
118 pdev = to_pci_dev(dev);
119 return devid == PCI_DEVID(pdev->bus->number, pdev->devfn);
120}
121
122static void chromeos_laptop_check_adapter(struct i2c_adapter *adapter)
123{
124 struct i2c_peripheral *i2c_dev;
125 int i;
126
127 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
128 i2c_dev = &cros_laptop->i2c_peripherals[i];
129
130 /* Skip devices already created */
131 if (i2c_dev->client)
132 continue;
133
134 if (strncmp(adapter->name, i2c_adapter_names[i2c_dev->type],
135 strlen(i2c_adapter_names[i2c_dev->type])))
136 continue;
137
138 if (i2c_dev->pci_devid &&
139 !chromeos_laptop_match_adapter_devid(adapter->dev.parent,
140 i2c_dev->pci_devid)) {
141 continue;
142 }
143
144 i2c_dev->client =
145 chromes_laptop_instantiate_i2c_device(adapter,
146 &i2c_dev->board_info,
147 i2c_dev->alt_addr);
148 }
149}
150
151static void chromeos_laptop_detach_i2c_client(struct i2c_client *client)
152{
153 struct i2c_peripheral *i2c_dev;
154 int i;
155
156 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
157 i2c_dev = &cros_laptop->i2c_peripherals[i];
158
159 if (i2c_dev->client == client)
160 i2c_dev->client = NULL;
161 }
162}
163
164static int chromeos_laptop_i2c_notifier_call(struct notifier_block *nb,
165 unsigned long action, void *data)
166{
167 struct device *dev = data;
168
169 switch (action) {
170 case BUS_NOTIFY_ADD_DEVICE:
171 if (dev->type == &i2c_adapter_type)
172 chromeos_laptop_check_adapter(to_i2c_adapter(dev));
173 break;
174
175 case BUS_NOTIFY_REMOVED_DEVICE:
176 if (dev->type == &i2c_client_type)
177 chromeos_laptop_detach_i2c_client(to_i2c_client(dev));
178 break;
179 }
180
181 return 0;
182}
183
184static struct notifier_block chromeos_laptop_i2c_notifier = {
185 .notifier_call = chromeos_laptop_i2c_notifier_call,
186};
187
188#define DECLARE_CROS_LAPTOP(_name) \
189static const struct chromeos_laptop _name __initconst = { \
190 .i2c_peripherals = _name##_peripherals, \
191 .num_i2c_peripherals = ARRAY_SIZE(_name##_peripherals), \
192}
193
194static struct i2c_peripheral samsung_series_5_550_peripherals[] __initdata = {
195 /* Touchpad. */
196 {
197 .board_info = {
198 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
199 .flags = I2C_CLIENT_WAKE,
200 },
201 .dmi_name = "trackpad",
202 .type = I2C_ADAPTER_SMBUS,
203 },
204 /* Light Sensor. */
205 {
206 .board_info = {
207 I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
208 },
209 .dmi_name = "lightsensor",
210 .type = I2C_ADAPTER_SMBUS,
211 },
212};
213DECLARE_CROS_LAPTOP(samsung_series_5_550);
214
215static struct i2c_peripheral samsung_series_5_peripherals[] __initdata = {
216 /* Light Sensor. */
217 {
218 .board_info = {
219 I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
220 },
221 .type = I2C_ADAPTER_SMBUS,
222 },
223};
224DECLARE_CROS_LAPTOP(samsung_series_5);
225
226static const int chromebook_pixel_tp_keys[] __initconst = {
227 KEY_RESERVED,
228 KEY_RESERVED,
229 KEY_RESERVED,
230 KEY_RESERVED,
231 KEY_RESERVED,
232 BTN_LEFT
233};
234
235static const struct property_entry
236chromebook_pixel_trackpad_props[] __initconst = {
237 PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", chromebook_pixel_tp_keys),
238 { }
239};
240
241static struct i2c_peripheral chromebook_pixel_peripherals[] __initdata = {
242 /* Touch Screen. */
243 {
244 .board_info = {
245 I2C_BOARD_INFO("atmel_mxt_ts",
246 ATMEL_TS_I2C_ADDR),
247 .flags = I2C_CLIENT_WAKE,
248 },
249 .dmi_name = "touchscreen",
250 .irqflags = IRQF_TRIGGER_FALLING,
251 .type = I2C_ADAPTER_PANEL,
252 .alt_addr = ATMEL_TS_I2C_BL_ADDR,
253 },
254 /* Touchpad. */
255 {
256 .board_info = {
257 I2C_BOARD_INFO("atmel_mxt_tp",
258 ATMEL_TP_I2C_ADDR),
259 .properties =
260 chromebook_pixel_trackpad_props,
261 .flags = I2C_CLIENT_WAKE,
262 },
263 .dmi_name = "trackpad",
264 .irqflags = IRQF_TRIGGER_FALLING,
265 .type = I2C_ADAPTER_VGADDC,
266 .alt_addr = ATMEL_TP_I2C_BL_ADDR,
267 },
268 /* Light Sensor. */
269 {
270 .board_info = {
271 I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
272 },
273 .dmi_name = "lightsensor",
274 .type = I2C_ADAPTER_PANEL,
275 },
276};
277DECLARE_CROS_LAPTOP(chromebook_pixel);
278
279static struct i2c_peripheral hp_chromebook_14_peripherals[] __initdata = {
280 /* Touchpad. */
281 {
282 .board_info = {
283 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
284 .flags = I2C_CLIENT_WAKE,
285 },
286 .dmi_name = "trackpad",
287 .type = I2C_ADAPTER_DESIGNWARE,
288 },
289};
290DECLARE_CROS_LAPTOP(hp_chromebook_14);
291
292static struct i2c_peripheral dell_chromebook_11_peripherals[] __initdata = {
293 /* Touchpad. */
294 {
295 .board_info = {
296 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
297 .flags = I2C_CLIENT_WAKE,
298 },
299 .dmi_name = "trackpad",
300 .type = I2C_ADAPTER_DESIGNWARE,
301 },
302 /* Elan Touchpad option. */
303 {
304 .board_info = {
305 I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
306 .flags = I2C_CLIENT_WAKE,
307 },
308 .dmi_name = "trackpad",
309 .type = I2C_ADAPTER_DESIGNWARE,
310 },
311};
312DECLARE_CROS_LAPTOP(dell_chromebook_11);
313
314static struct i2c_peripheral toshiba_cb35_peripherals[] __initdata = {
315 /* Touchpad. */
316 {
317 .board_info = {
318 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
319 .flags = I2C_CLIENT_WAKE,
320 },
321 .dmi_name = "trackpad",
322 .type = I2C_ADAPTER_DESIGNWARE,
323 },
324};
325DECLARE_CROS_LAPTOP(toshiba_cb35);
326
327static struct i2c_peripheral acer_c7_chromebook_peripherals[] __initdata = {
328 /* Touchpad. */
329 {
330 .board_info = {
331 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
332 .flags = I2C_CLIENT_WAKE,
333 },
334 .dmi_name = "trackpad",
335 .type = I2C_ADAPTER_SMBUS,
336 },
337};
338DECLARE_CROS_LAPTOP(acer_c7_chromebook);
339
340static struct i2c_peripheral acer_ac700_peripherals[] __initdata = {
341 /* Light Sensor. */
342 {
343 .board_info = {
344 I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
345 },
346 .type = I2C_ADAPTER_SMBUS,
347 },
348};
349DECLARE_CROS_LAPTOP(acer_ac700);
350
351static struct i2c_peripheral acer_c720_peripherals[] __initdata = {
352 /* Touchscreen. */
353 {
354 .board_info = {
355 I2C_BOARD_INFO("atmel_mxt_ts",
356 ATMEL_TS_I2C_ADDR),
357 .flags = I2C_CLIENT_WAKE,
358 },
359 .dmi_name = "touchscreen",
360 .irqflags = IRQF_TRIGGER_FALLING,
361 .type = I2C_ADAPTER_DESIGNWARE,
362 .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
363 .alt_addr = ATMEL_TS_I2C_BL_ADDR,
364 },
365 /* Touchpad. */
366 {
367 .board_info = {
368 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
369 .flags = I2C_CLIENT_WAKE,
370 },
371 .dmi_name = "trackpad",
372 .type = I2C_ADAPTER_DESIGNWARE,
373 .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
374 },
375 /* Elan Touchpad option. */
376 {
377 .board_info = {
378 I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
379 .flags = I2C_CLIENT_WAKE,
380 },
381 .dmi_name = "trackpad",
382 .type = I2C_ADAPTER_DESIGNWARE,
383 .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
384 },
385 /* Light Sensor. */
386 {
387 .board_info = {
388 I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
389 },
390 .dmi_name = "lightsensor",
391 .type = I2C_ADAPTER_DESIGNWARE,
392 .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
393 },
394};
395DECLARE_CROS_LAPTOP(acer_c720);
396
397static struct i2c_peripheral
398hp_pavilion_14_chromebook_peripherals[] __initdata = {
399 /* Touchpad. */
400 {
401 .board_info = {
402 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
403 .flags = I2C_CLIENT_WAKE,
404 },
405 .dmi_name = "trackpad",
406 .type = I2C_ADAPTER_SMBUS,
407 },
408};
409DECLARE_CROS_LAPTOP(hp_pavilion_14_chromebook);
410
411static struct i2c_peripheral cr48_peripherals[] __initdata = {
412 /* Light Sensor. */
413 {
414 .board_info = {
415 I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
416 },
417 .type = I2C_ADAPTER_SMBUS,
418 },
419};
420DECLARE_CROS_LAPTOP(cr48);
421
422static const struct dmi_system_id chromeos_laptop_dmi_table[] __initconst = {
423 {
424 .ident = "Samsung Series 5 550",
425 .matches = {
426 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
427 DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
428 },
429 .driver_data = (void *)&samsung_series_5_550,
430 },
431 {
432 .ident = "Samsung Series 5",
433 .matches = {
434 DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
435 },
436 .driver_data = (void *)&samsung_series_5,
437 },
438 {
439 .ident = "Chromebook Pixel",
440 .matches = {
441 DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
442 DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
443 },
444 .driver_data = (void *)&chromebook_pixel,
445 },
446 {
447 .ident = "Wolf",
448 .matches = {
449 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
450 DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
451 },
452 .driver_data = (void *)&dell_chromebook_11,
453 },
454 {
455 .ident = "HP Chromebook 14",
456 .matches = {
457 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
458 DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
459 },
460 .driver_data = (void *)&hp_chromebook_14,
461 },
462 {
463 .ident = "Toshiba CB35",
464 .matches = {
465 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
466 DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
467 },
468 .driver_data = (void *)&toshiba_cb35,
469 },
470 {
471 .ident = "Acer C7 Chromebook",
472 .matches = {
473 DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
474 },
475 .driver_data = (void *)&acer_c7_chromebook,
476 },
477 {
478 .ident = "Acer AC700",
479 .matches = {
480 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
481 },
482 .driver_data = (void *)&acer_ac700,
483 },
484 {
485 .ident = "Acer C720",
486 .matches = {
487 DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
488 },
489 .driver_data = (void *)&acer_c720,
490 },
491 {
492 .ident = "HP Pavilion 14 Chromebook",
493 .matches = {
494 DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
495 },
496 .driver_data = (void *)&hp_pavilion_14_chromebook,
497 },
498 {
499 .ident = "Cr-48",
500 .matches = {
501 DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
502 },
503 .driver_data = (void *)&cr48,
504 },
505 { }
506};
507MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
508
509static int __init chromeos_laptop_scan_adapter(struct device *dev, void *data)
510{
511 struct i2c_adapter *adapter;
512
513 adapter = i2c_verify_adapter(dev);
514 if (adapter)
515 chromeos_laptop_check_adapter(adapter);
516
517 return 0;
518}
519
520static int __init chromeos_laptop_get_irq_from_dmi(const char *dmi_name)
521{
522 const struct dmi_device *dmi_dev;
523 const struct dmi_dev_onboard *dev_data;
524
525 dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, dmi_name, NULL);
526 if (!dmi_dev) {
527 pr_err("failed to find DMI device '%s'\n", dmi_name);
528 return -ENOENT;
529 }
530
531 dev_data = dmi_dev->device_data;
532 if (!dev_data) {
533 pr_err("failed to get data from DMI for '%s'\n", dmi_name);
534 return -EINVAL;
535 }
536
537 return dev_data->instance;
538}
539
540static int __init chromeos_laptop_setup_irq(struct i2c_peripheral *i2c_dev)
541{
542 int irq;
543
544 if (i2c_dev->dmi_name) {
545 irq = chromeos_laptop_get_irq_from_dmi(i2c_dev->dmi_name);
546 if (irq < 0)
547 return irq;
548
549 i2c_dev->irq_resource = (struct resource)
550 DEFINE_RES_NAMED(irq, 1, NULL,
551 IORESOURCE_IRQ | i2c_dev->irqflags);
552 i2c_dev->board_info.resources = &i2c_dev->irq_resource;
553 i2c_dev->board_info.num_resources = 1;
554 }
555
556 return 0;
557}
558
559static struct chromeos_laptop * __init
560chromeos_laptop_prepare(const struct chromeos_laptop *src)
561{
562 struct chromeos_laptop *cros_laptop;
563 struct i2c_peripheral *i2c_dev;
564 struct i2c_board_info *info;
565 int error;
566 int i;
567
568 cros_laptop = kzalloc(sizeof(*cros_laptop), GFP_KERNEL);
569 if (!cros_laptop)
570 return ERR_PTR(-ENOMEM);
571
572 cros_laptop->i2c_peripherals = kmemdup(src->i2c_peripherals,
573 src->num_i2c_peripherals *
574 sizeof(*src->i2c_peripherals),
575 GFP_KERNEL);
576 if (!cros_laptop->i2c_peripherals) {
577 error = -ENOMEM;
578 goto err_free_cros_laptop;
579 }
580
581 cros_laptop->num_i2c_peripherals = src->num_i2c_peripherals;
582
583 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
584 i2c_dev = &cros_laptop->i2c_peripherals[i];
585 info = &i2c_dev->board_info;
586
587 error = chromeos_laptop_setup_irq(i2c_dev);
588 if (error)
589 goto err_destroy_cros_peripherals;
590
591 /* We need to deep-copy properties */
592 if (info->properties) {
593 info->properties =
594 property_entries_dup(info->properties);
595 if (IS_ERR(info->properties)) {
596 error = PTR_ERR(info->properties);
597 goto err_destroy_cros_peripherals;
598 }
599 }
600 }
601
602 return cros_laptop;
603
604err_destroy_cros_peripherals:
605 while (--i >= 0) {
606 i2c_dev = &cros_laptop->i2c_peripherals[i];
607 info = &i2c_dev->board_info;
608 if (info->properties)
609 property_entries_free(info->properties);
610 }
611 kfree(cros_laptop->i2c_peripherals);
612err_free_cros_laptop:
613 kfree(cros_laptop);
614 return ERR_PTR(error);
615}
616
617static void chromeos_laptop_destroy(const struct chromeos_laptop *cros_laptop)
618{
619 struct i2c_peripheral *i2c_dev;
620 struct i2c_board_info *info;
621 int i;
622
623 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
624 i2c_dev = &cros_laptop->i2c_peripherals[i];
625 info = &i2c_dev->board_info;
626
627 if (i2c_dev->client)
628 i2c_unregister_device(i2c_dev->client);
629
630 if (info->properties)
631 property_entries_free(info->properties);
632 }
633
634 kfree(cros_laptop->i2c_peripherals);
635 kfree(cros_laptop);
636}
637
638static int __init chromeos_laptop_init(void)
639{
640 const struct dmi_system_id *dmi_id;
641 int error;
642
643 dmi_id = dmi_first_match(chromeos_laptop_dmi_table);
644 if (!dmi_id) {
645 pr_debug("unsupported system\n");
646 return -ENODEV;
647 }
648
649 pr_debug("DMI Matched %s\n", dmi_id->ident);
650
651 cros_laptop = chromeos_laptop_prepare((void *)dmi_id->driver_data);
652 if (IS_ERR(cros_laptop))
653 return PTR_ERR(cros_laptop);
654
655 error = bus_register_notifier(&i2c_bus_type,
656 &chromeos_laptop_i2c_notifier);
657 if (error) {
658 pr_err("failed to register i2c bus notifier: %d\n", error);
659 chromeos_laptop_destroy(cros_laptop);
660 return error;
661 }
662
663 /*
664 * Scan adapters that have been registered before we installed
665 * the notifier to make sure we do not miss any devices.
666 */
667 i2c_for_each_dev(NULL, chromeos_laptop_scan_adapter);
668
669 return 0;
670}
671
672static void __exit chromeos_laptop_exit(void)
673{
674 bus_unregister_notifier(&i2c_bus_type, &chromeos_laptop_i2c_notifier);
675 chromeos_laptop_destroy(cros_laptop);
676}
677
678module_init(chromeos_laptop_init);
679module_exit(chromeos_laptop_exit);
680
681MODULE_DESCRIPTION("Chrome OS Laptop driver");
682MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
683MODULE_LICENSE("GPL");