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