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_dev;
744 struct i2c_board_info *info;
745 int i;
746 int error;
747
748 if (!src->num_i2c_peripherals)
749 return 0;
750
751 cros_laptop->i2c_peripherals = kmemdup(src->i2c_peripherals,
752 src->num_i2c_peripherals *
753 sizeof(*src->i2c_peripherals),
754 GFP_KERNEL);
755 if (!cros_laptop->i2c_peripherals)
756 return -ENOMEM;
757
758 cros_laptop->num_i2c_peripherals = src->num_i2c_peripherals;
759
760 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
761 i2c_dev = &cros_laptop->i2c_peripherals[i];
762 info = &i2c_dev->board_info;
763
764 error = chromeos_laptop_setup_irq(i2c_dev);
765 if (error)
766 goto err_out;
767
768 /* Create primary fwnode for the device - copies everything */
769 if (i2c_dev->properties) {
770 info->fwnode = fwnode_create_software_node(i2c_dev->properties, NULL);
771 if (IS_ERR(info->fwnode)) {
772 error = PTR_ERR(info->fwnode);
773 goto err_out;
774 }
775 }
776 }
777
778 return 0;
779
780 err_out:
781 while (--i >= 0) {
782 i2c_dev = &cros_laptop->i2c_peripherals[i];
783 info = &i2c_dev->board_info;
784 if (!IS_ERR_OR_NULL(info->fwnode))
785 fwnode_remove_software_node(info->fwnode);
786 }
787 kfree(cros_laptop->i2c_peripherals);
788 return error;
789 }
790
791 static int __init
chromeos_laptop_prepare_acpi_peripherals(struct chromeos_laptop * cros_laptop,const struct chromeos_laptop * src)792 chromeos_laptop_prepare_acpi_peripherals(struct chromeos_laptop *cros_laptop,
793 const struct chromeos_laptop *src)
794 {
795 struct acpi_peripheral *acpi_peripherals;
796 struct acpi_peripheral *acpi_dev;
797 const struct acpi_peripheral *src_dev;
798 int n_peripherals = 0;
799 int i;
800 int error;
801
802 for (i = 0; i < src->num_acpi_peripherals; i++) {
803 if (acpi_dev_present(src->acpi_peripherals[i].hid, NULL, -1))
804 n_peripherals++;
805 }
806
807 if (!n_peripherals)
808 return 0;
809
810 acpi_peripherals = kcalloc(n_peripherals,
811 sizeof(*src->acpi_peripherals),
812 GFP_KERNEL);
813 if (!acpi_peripherals)
814 return -ENOMEM;
815
816 acpi_dev = acpi_peripherals;
817 for (i = 0; i < src->num_acpi_peripherals; i++) {
818 src_dev = &src->acpi_peripherals[i];
819 if (!acpi_dev_present(src_dev->hid, NULL, -1))
820 continue;
821
822 *acpi_dev = *src_dev;
823
824 /* We need to deep-copy properties */
825 if (src_dev->swnode.properties) {
826 acpi_dev->swnode.properties =
827 property_entries_dup(src_dev->swnode.properties);
828 if (IS_ERR(acpi_dev->swnode.properties)) {
829 error = PTR_ERR(acpi_dev->swnode.properties);
830 goto err_out;
831 }
832 }
833
834 acpi_dev++;
835 }
836
837 cros_laptop->acpi_peripherals = acpi_peripherals;
838 cros_laptop->num_acpi_peripherals = n_peripherals;
839
840 return 0;
841
842 err_out:
843 while (--i >= 0) {
844 acpi_dev = &acpi_peripherals[i];
845 if (!IS_ERR_OR_NULL(acpi_dev->swnode.properties))
846 property_entries_free(acpi_dev->swnode.properties);
847 }
848
849 kfree(acpi_peripherals);
850 return error;
851 }
852
chromeos_laptop_destroy(const struct chromeos_laptop * cros_laptop)853 static void chromeos_laptop_destroy(const struct chromeos_laptop *cros_laptop)
854 {
855 const struct acpi_peripheral *acpi_dev;
856 struct i2c_peripheral *i2c_dev;
857 int i;
858
859 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
860 i2c_dev = &cros_laptop->i2c_peripherals[i];
861 i2c_unregister_device(i2c_dev->client);
862 }
863
864 for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
865 acpi_dev = &cros_laptop->acpi_peripherals[i];
866
867 if (acpi_dev->client)
868 device_remove_software_node(&acpi_dev->client->dev);
869
870 property_entries_free(acpi_dev->swnode.properties);
871 }
872
873 kfree(cros_laptop->i2c_peripherals);
874 kfree(cros_laptop->acpi_peripherals);
875 kfree(cros_laptop);
876 }
877
878 static struct chromeos_laptop * __init
chromeos_laptop_prepare(const struct chromeos_laptop * src)879 chromeos_laptop_prepare(const struct chromeos_laptop *src)
880 {
881 struct chromeos_laptop *cros_laptop;
882 int error;
883
884 cros_laptop = kzalloc(sizeof(*cros_laptop), GFP_KERNEL);
885 if (!cros_laptop)
886 return ERR_PTR(-ENOMEM);
887
888 error = chromeos_laptop_prepare_i2c_peripherals(cros_laptop, src);
889 if (!error)
890 error = chromeos_laptop_prepare_acpi_peripherals(cros_laptop,
891 src);
892
893 if (error) {
894 chromeos_laptop_destroy(cros_laptop);
895 return ERR_PTR(error);
896 }
897
898 return cros_laptop;
899 }
900
chromeos_laptop_init(void)901 static int __init chromeos_laptop_init(void)
902 {
903 const struct dmi_system_id *dmi_id;
904 int error;
905
906 dmi_id = dmi_first_match(chromeos_laptop_dmi_table);
907 if (!dmi_id) {
908 pr_debug("unsupported system\n");
909 return -ENODEV;
910 }
911
912 pr_debug("DMI Matched %s\n", dmi_id->ident);
913
914 cros_laptop = chromeos_laptop_prepare((void *)dmi_id->driver_data);
915 if (IS_ERR(cros_laptop))
916 return PTR_ERR(cros_laptop);
917
918 if (!cros_laptop->num_i2c_peripherals &&
919 !cros_laptop->num_acpi_peripherals) {
920 pr_debug("no relevant devices detected\n");
921 error = -ENODEV;
922 goto err_destroy_cros_laptop;
923 }
924
925 error = bus_register_notifier(&i2c_bus_type,
926 &chromeos_laptop_i2c_notifier);
927 if (error) {
928 pr_err("failed to register i2c bus notifier: %d\n",
929 error);
930 goto err_destroy_cros_laptop;
931 }
932
933 /*
934 * Scan adapters that have been registered and clients that have
935 * been created before we installed the notifier to make sure
936 * we do not miss any devices.
937 */
938 i2c_for_each_dev(NULL, chromeos_laptop_scan_peripherals);
939
940 return 0;
941
942 err_destroy_cros_laptop:
943 chromeos_laptop_destroy(cros_laptop);
944 return error;
945 }
946
chromeos_laptop_exit(void)947 static void __exit chromeos_laptop_exit(void)
948 {
949 bus_unregister_notifier(&i2c_bus_type, &chromeos_laptop_i2c_notifier);
950 chromeos_laptop_destroy(cros_laptop);
951 }
952
953 module_init(chromeos_laptop_init);
954 module_exit(chromeos_laptop_exit);
955
956 MODULE_DESCRIPTION("Chrome OS Laptop driver");
957 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
958 MODULE_LICENSE("GPL");
959