Loading...
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_array(src->i2c_peripherals,
753 src->num_i2c_peripherals,
754 sizeof(*i2c_peripherals), GFP_KERNEL);
755 if (!i2c_peripherals)
756 return -ENOMEM;
757
758 for (i = 0; i < src->num_i2c_peripherals; i++) {
759 i2c_dev = &i2c_peripherals[i];
760 info = &i2c_dev->board_info;
761
762 error = chromeos_laptop_setup_irq(i2c_dev);
763 if (error)
764 goto err_out;
765
766 /* Create primary fwnode for the device - copies everything */
767 if (i2c_dev->properties) {
768 info->fwnode = fwnode_create_software_node(i2c_dev->properties, NULL);
769 if (IS_ERR(info->fwnode)) {
770 error = PTR_ERR(info->fwnode);
771 goto err_out;
772 }
773 }
774 }
775
776 cros_laptop->i2c_peripherals = i2c_peripherals;
777 cros_laptop->num_i2c_peripherals = src->num_i2c_peripherals;
778
779 return 0;
780
781err_out:
782 while (--i >= 0) {
783 i2c_dev = &i2c_peripherals[i];
784 info = &i2c_dev->board_info;
785 if (!IS_ERR_OR_NULL(info->fwnode))
786 fwnode_remove_software_node(info->fwnode);
787 }
788 kfree(i2c_peripherals);
789 return error;
790}
791
792static int __init
793chromeos_laptop_prepare_acpi_peripherals(struct chromeos_laptop *cros_laptop,
794 const struct chromeos_laptop *src)
795{
796 struct acpi_peripheral *acpi_peripherals;
797 struct acpi_peripheral *acpi_dev;
798 const struct acpi_peripheral *src_dev;
799 int n_peripherals = 0;
800 int i;
801 int error;
802
803 for (i = 0; i < src->num_acpi_peripherals; i++) {
804 if (acpi_dev_present(src->acpi_peripherals[i].hid, NULL, -1))
805 n_peripherals++;
806 }
807
808 if (!n_peripherals)
809 return 0;
810
811 acpi_peripherals = kcalloc(n_peripherals,
812 sizeof(*src->acpi_peripherals),
813 GFP_KERNEL);
814 if (!acpi_peripherals)
815 return -ENOMEM;
816
817 acpi_dev = acpi_peripherals;
818 for (i = 0; i < src->num_acpi_peripherals; i++) {
819 src_dev = &src->acpi_peripherals[i];
820 if (!acpi_dev_present(src_dev->hid, NULL, -1))
821 continue;
822
823 *acpi_dev = *src_dev;
824
825 /* We need to deep-copy properties */
826 if (src_dev->swnode.properties) {
827 acpi_dev->swnode.properties =
828 property_entries_dup(src_dev->swnode.properties);
829 if (IS_ERR(acpi_dev->swnode.properties)) {
830 error = PTR_ERR(acpi_dev->swnode.properties);
831 goto err_out;
832 }
833 }
834
835 acpi_dev++;
836 }
837
838 cros_laptop->acpi_peripherals = acpi_peripherals;
839 cros_laptop->num_acpi_peripherals = n_peripherals;
840
841 return 0;
842
843err_out:
844 while (--i >= 0) {
845 acpi_dev = &acpi_peripherals[i];
846 if (!IS_ERR_OR_NULL(acpi_dev->swnode.properties))
847 property_entries_free(acpi_dev->swnode.properties);
848 }
849
850 kfree(acpi_peripherals);
851 return error;
852}
853
854static void chromeos_laptop_destroy(const struct chromeos_laptop *cros_laptop)
855{
856 const struct acpi_peripheral *acpi_dev;
857 struct i2c_peripheral *i2c_dev;
858 int i;
859
860 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
861 i2c_dev = &cros_laptop->i2c_peripherals[i];
862 i2c_unregister_device(i2c_dev->client);
863 }
864
865 for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
866 acpi_dev = &cros_laptop->acpi_peripherals[i];
867
868 if (acpi_dev->client)
869 device_remove_software_node(&acpi_dev->client->dev);
870
871 property_entries_free(acpi_dev->swnode.properties);
872 }
873
874 kfree(cros_laptop->i2c_peripherals);
875 kfree(cros_laptop->acpi_peripherals);
876 kfree(cros_laptop);
877}
878
879static struct chromeos_laptop * __init
880chromeos_laptop_prepare(const struct chromeos_laptop *src)
881{
882 struct chromeos_laptop *cros_laptop;
883 int error;
884
885 cros_laptop = kzalloc(sizeof(*cros_laptop), GFP_KERNEL);
886 if (!cros_laptop)
887 return ERR_PTR(-ENOMEM);
888
889 error = chromeos_laptop_prepare_i2c_peripherals(cros_laptop, src);
890 if (!error)
891 error = chromeos_laptop_prepare_acpi_peripherals(cros_laptop,
892 src);
893
894 if (error) {
895 chromeos_laptop_destroy(cros_laptop);
896 return ERR_PTR(error);
897 }
898
899 return cros_laptop;
900}
901
902static int __init chromeos_laptop_init(void)
903{
904 const struct dmi_system_id *dmi_id;
905 int error;
906
907 dmi_id = dmi_first_match(chromeos_laptop_dmi_table);
908 if (!dmi_id) {
909 pr_debug("unsupported system\n");
910 return -ENODEV;
911 }
912
913 pr_debug("DMI Matched %s\n", dmi_id->ident);
914
915 cros_laptop = chromeos_laptop_prepare((void *)dmi_id->driver_data);
916 if (IS_ERR(cros_laptop))
917 return PTR_ERR(cros_laptop);
918
919 if (!cros_laptop->num_i2c_peripherals &&
920 !cros_laptop->num_acpi_peripherals) {
921 pr_debug("no relevant devices detected\n");
922 error = -ENODEV;
923 goto err_destroy_cros_laptop;
924 }
925
926 error = bus_register_notifier(&i2c_bus_type,
927 &chromeos_laptop_i2c_notifier);
928 if (error) {
929 pr_err("failed to register i2c bus notifier: %d\n",
930 error);
931 goto err_destroy_cros_laptop;
932 }
933
934 /*
935 * Scan adapters that have been registered and clients that have
936 * been created before we installed the notifier to make sure
937 * we do not miss any devices.
938 */
939 i2c_for_each_dev(NULL, chromeos_laptop_scan_peripherals);
940
941 return 0;
942
943err_destroy_cros_laptop:
944 chromeos_laptop_destroy(cros_laptop);
945 return error;
946}
947
948static void __exit chromeos_laptop_exit(void)
949{
950 bus_unregister_notifier(&i2c_bus_type, &chromeos_laptop_i2c_notifier);
951 chromeos_laptop_destroy(cros_laptop);
952}
953
954module_init(chromeos_laptop_init);
955module_exit(chromeos_laptop_exit);
956
957MODULE_DESCRIPTION("Chrome OS Laptop driver");
958MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
959MODULE_LICENSE("GPL");
1/*
2 * chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices.
3 *
4 * Author : Benson Leung <bleung@chromium.org>
5 *
6 * Copyright (C) 2012 Google, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24#include <linux/dmi.h>
25#include <linux/i2c.h>
26#include <linux/i2c/atmel_mxt_ts.h>
27#include <linux/input.h>
28#include <linux/interrupt.h>
29#include <linux/module.h>
30#include <linux/platform_device.h>
31
32#define ATMEL_TP_I2C_ADDR 0x4b
33#define ATMEL_TP_I2C_BL_ADDR 0x25
34#define ATMEL_TS_I2C_ADDR 0x4a
35#define ATMEL_TS_I2C_BL_ADDR 0x26
36#define CYAPA_TP_I2C_ADDR 0x67
37#define ISL_ALS_I2C_ADDR 0x44
38#define TAOS_ALS_I2C_ADDR 0x29
39
40static struct i2c_client *als;
41static struct i2c_client *tp;
42static struct i2c_client *ts;
43
44static const char *i2c_adapter_names[] = {
45 "SMBus I801 adapter",
46 "i915 gmbus vga",
47 "i915 gmbus panel",
48};
49
50/* Keep this enum consistent with i2c_adapter_names */
51enum i2c_adapter_type {
52 I2C_ADAPTER_SMBUS = 0,
53 I2C_ADAPTER_VGADDC,
54 I2C_ADAPTER_PANEL,
55};
56
57struct i2c_peripheral {
58 int (*add)(enum i2c_adapter_type type);
59 enum i2c_adapter_type type;
60};
61
62#define MAX_I2C_PERIPHERALS 3
63
64struct chromeos_laptop {
65 struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
66};
67
68static struct chromeos_laptop *cros_laptop;
69
70static struct i2c_board_info cyapa_device = {
71 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
72 .flags = I2C_CLIENT_WAKE,
73};
74
75static struct i2c_board_info isl_als_device = {
76 I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
77};
78
79static struct i2c_board_info tsl2583_als_device = {
80 I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
81};
82
83static struct i2c_board_info tsl2563_als_device = {
84 I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
85};
86
87static struct mxt_platform_data atmel_224s_tp_platform_data = {
88 .x_line = 18,
89 .y_line = 12,
90 .x_size = 102*20,
91 .y_size = 68*20,
92 .blen = 0x80, /* Gain setting is in upper 4 bits */
93 .threshold = 0x32,
94 .voltage = 0, /* 3.3V */
95 .orient = MXT_VERTICAL_FLIP,
96 .irqflags = IRQF_TRIGGER_FALLING,
97 .is_tp = true,
98 .key_map = { KEY_RESERVED,
99 KEY_RESERVED,
100 KEY_RESERVED,
101 BTN_LEFT },
102 .config = NULL,
103 .config_length = 0,
104};
105
106static struct i2c_board_info atmel_224s_tp_device = {
107 I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
108 .platform_data = &atmel_224s_tp_platform_data,
109 .flags = I2C_CLIENT_WAKE,
110};
111
112static struct mxt_platform_data atmel_1664s_platform_data = {
113 .x_line = 32,
114 .y_line = 50,
115 .x_size = 1700,
116 .y_size = 2560,
117 .blen = 0x89, /* Gain setting is in upper 4 bits */
118 .threshold = 0x28,
119 .voltage = 0, /* 3.3V */
120 .orient = MXT_ROTATED_90_COUNTER,
121 .irqflags = IRQF_TRIGGER_FALLING,
122 .is_tp = false,
123 .config = NULL,
124 .config_length = 0,
125};
126
127static struct i2c_board_info atmel_1664s_device = {
128 I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
129 .platform_data = &atmel_1664s_platform_data,
130 .flags = I2C_CLIENT_WAKE,
131};
132
133static struct i2c_client *__add_probed_i2c_device(
134 const char *name,
135 int bus,
136 struct i2c_board_info *info,
137 const unsigned short *addrs)
138{
139 const struct dmi_device *dmi_dev;
140 const struct dmi_dev_onboard *dev_data;
141 struct i2c_adapter *adapter;
142 struct i2c_client *client;
143
144 if (bus < 0)
145 return NULL;
146 /*
147 * If a name is specified, look for irq platform information stashed
148 * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
149 */
150 if (name) {
151 dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
152 if (!dmi_dev) {
153 pr_err("%s failed to dmi find device %s.\n",
154 __func__,
155 name);
156 return NULL;
157 }
158 dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
159 if (!dev_data) {
160 pr_err("%s failed to get data from dmi for %s.\n",
161 __func__, name);
162 return NULL;
163 }
164 info->irq = dev_data->instance;
165 }
166
167 adapter = i2c_get_adapter(bus);
168 if (!adapter) {
169 pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
170 return NULL;
171 }
172
173 /* add the i2c device */
174 client = i2c_new_probed_device(adapter, info, addrs, NULL);
175 if (!client)
176 pr_err("%s failed to register device %d-%02x\n",
177 __func__, bus, info->addr);
178 else
179 pr_debug("%s added i2c device %d-%02x\n",
180 __func__, bus, info->addr);
181
182 i2c_put_adapter(adapter);
183 return client;
184}
185
186static int __find_i2c_adap(struct device *dev, void *data)
187{
188 const char *name = data;
189 static const char *prefix = "i2c-";
190 struct i2c_adapter *adapter;
191 if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
192 return 0;
193 adapter = to_i2c_adapter(dev);
194 return (strncmp(adapter->name, name, strlen(name)) == 0);
195}
196
197static int find_i2c_adapter_num(enum i2c_adapter_type type)
198{
199 struct device *dev = NULL;
200 struct i2c_adapter *adapter;
201 const char *name = i2c_adapter_names[type];
202 /* find the adapter by name */
203 dev = bus_find_device(&i2c_bus_type, NULL, (void *)name,
204 __find_i2c_adap);
205 if (!dev) {
206 /* Adapters may appear later. Deferred probing will retry */
207 pr_notice("%s: i2c adapter %s not found on system.\n", __func__,
208 name);
209 return -ENODEV;
210 }
211 adapter = to_i2c_adapter(dev);
212 return adapter->nr;
213}
214
215/*
216 * Takes a list of addresses in addrs as such :
217 * { addr1, ... , addrn, I2C_CLIENT_END };
218 * add_probed_i2c_device will use i2c_new_probed_device
219 * and probe for devices at all of the addresses listed.
220 * Returns NULL if no devices found.
221 * See Documentation/i2c/instantiating-devices for more information.
222 */
223static struct i2c_client *add_probed_i2c_device(
224 const char *name,
225 enum i2c_adapter_type type,
226 struct i2c_board_info *info,
227 const unsigned short *addrs)
228{
229 return __add_probed_i2c_device(name,
230 find_i2c_adapter_num(type),
231 info,
232 addrs);
233}
234
235/*
236 * Probes for a device at a single address, the one provided by
237 * info->addr.
238 * Returns NULL if no device found.
239 */
240static struct i2c_client *add_i2c_device(const char *name,
241 enum i2c_adapter_type type,
242 struct i2c_board_info *info)
243{
244 const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
245 return __add_probed_i2c_device(name,
246 find_i2c_adapter_num(type),
247 info,
248 addr_list);
249}
250
251static int setup_cyapa_tp(enum i2c_adapter_type type)
252{
253 if (tp)
254 return 0;
255
256 /* add cyapa touchpad */
257 tp = add_i2c_device("trackpad", type, &cyapa_device);
258 return (!tp) ? -EAGAIN : 0;
259}
260
261static int setup_atmel_224s_tp(enum i2c_adapter_type type)
262{
263 const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
264 ATMEL_TP_I2C_ADDR,
265 I2C_CLIENT_END };
266 if (tp)
267 return 0;
268
269 /* add atmel mxt touchpad */
270 tp = add_probed_i2c_device("trackpad", type,
271 &atmel_224s_tp_device, addr_list);
272 return (!tp) ? -EAGAIN : 0;
273}
274
275static int setup_atmel_1664s_ts(enum i2c_adapter_type type)
276{
277 const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
278 ATMEL_TS_I2C_ADDR,
279 I2C_CLIENT_END };
280 if (ts)
281 return 0;
282
283 /* add atmel mxt touch device */
284 ts = add_probed_i2c_device("touchscreen", type,
285 &atmel_1664s_device, addr_list);
286 return (!ts) ? -EAGAIN : 0;
287}
288
289static int setup_isl29018_als(enum i2c_adapter_type type)
290{
291 if (als)
292 return 0;
293
294 /* add isl29018 light sensor */
295 als = add_i2c_device("lightsensor", type, &isl_als_device);
296 return (!als) ? -EAGAIN : 0;
297}
298
299static int setup_tsl2583_als(enum i2c_adapter_type type)
300{
301 if (als)
302 return 0;
303
304 /* add tsl2583 light sensor */
305 als = add_i2c_device(NULL, type, &tsl2583_als_device);
306 return (!als) ? -EAGAIN : 0;
307}
308
309static int setup_tsl2563_als(enum i2c_adapter_type type)
310{
311 if (als)
312 return 0;
313
314 /* add tsl2563 light sensor */
315 als = add_i2c_device(NULL, type, &tsl2563_als_device);
316 return (!als) ? -EAGAIN : 0;
317}
318
319static int __init chromeos_laptop_dmi_matched(const struct dmi_system_id *id)
320{
321 cros_laptop = (void *)id->driver_data;
322 pr_debug("DMI Matched %s.\n", id->ident);
323
324 /* Indicate to dmi_scan that processing is done. */
325 return 1;
326}
327
328static int chromeos_laptop_probe(struct platform_device *pdev)
329{
330 int i;
331 int ret = 0;
332
333 for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
334 struct i2c_peripheral *i2c_dev;
335
336 i2c_dev = &cros_laptop->i2c_peripherals[i];
337
338 /* No more peripherals. */
339 if (i2c_dev->add == NULL)
340 break;
341
342 /* Add the device. Set -EPROBE_DEFER on any failure */
343 if (i2c_dev->add(i2c_dev->type))
344 ret = -EPROBE_DEFER;
345 }
346
347 return ret;
348}
349
350static struct chromeos_laptop samsung_series_5_550 = {
351 .i2c_peripherals = {
352 /* Touchpad. */
353 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
354 /* Light Sensor. */
355 { .add = setup_isl29018_als, I2C_ADAPTER_SMBUS },
356 },
357};
358
359static struct chromeos_laptop samsung_series_5 = {
360 .i2c_peripherals = {
361 /* Light Sensor. */
362 { .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
363 },
364};
365
366static struct chromeos_laptop chromebook_pixel = {
367 .i2c_peripherals = {
368 /* Touch Screen. */
369 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_PANEL },
370 /* Touchpad. */
371 { .add = setup_atmel_224s_tp, I2C_ADAPTER_VGADDC },
372 /* Light Sensor. */
373 { .add = setup_isl29018_als, I2C_ADAPTER_PANEL },
374 },
375};
376
377static struct chromeos_laptop acer_c7_chromebook = {
378 .i2c_peripherals = {
379 /* Touchpad. */
380 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
381 },
382};
383
384static struct chromeos_laptop acer_ac700 = {
385 .i2c_peripherals = {
386 /* Light Sensor. */
387 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
388 },
389};
390
391static struct chromeos_laptop hp_pavilion_14_chromebook = {
392 .i2c_peripherals = {
393 /* Touchpad. */
394 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
395 },
396};
397
398static struct chromeos_laptop cr48 = {
399 .i2c_peripherals = {
400 /* Light Sensor. */
401 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
402 },
403};
404
405#define _CBDD(board_) \
406 .callback = chromeos_laptop_dmi_matched, \
407 .driver_data = (void *)&board_
408
409static struct dmi_system_id chromeos_laptop_dmi_table[] __initdata = {
410 {
411 .ident = "Samsung Series 5 550",
412 .matches = {
413 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
414 DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
415 },
416 _CBDD(samsung_series_5_550),
417 },
418 {
419 .ident = "Samsung Series 5",
420 .matches = {
421 DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
422 },
423 _CBDD(samsung_series_5),
424 },
425 {
426 .ident = "Chromebook Pixel",
427 .matches = {
428 DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
429 DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
430 },
431 _CBDD(chromebook_pixel),
432 },
433 {
434 .ident = "Acer C7 Chromebook",
435 .matches = {
436 DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
437 },
438 _CBDD(acer_c7_chromebook),
439 },
440 {
441 .ident = "Acer AC700",
442 .matches = {
443 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
444 },
445 _CBDD(acer_ac700),
446 },
447 {
448 .ident = "HP Pavilion 14 Chromebook",
449 .matches = {
450 DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
451 },
452 _CBDD(hp_pavilion_14_chromebook),
453 },
454 {
455 .ident = "Cr-48",
456 .matches = {
457 DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
458 },
459 _CBDD(cr48),
460 },
461 { }
462};
463MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
464
465static struct platform_device *cros_platform_device;
466
467static struct platform_driver cros_platform_driver = {
468 .driver = {
469 .name = "chromeos_laptop",
470 .owner = THIS_MODULE,
471 },
472 .probe = chromeos_laptop_probe,
473};
474
475static int __init chromeos_laptop_init(void)
476{
477 int ret;
478 if (!dmi_check_system(chromeos_laptop_dmi_table)) {
479 pr_debug("%s unsupported system.\n", __func__);
480 return -ENODEV;
481 }
482
483 ret = platform_driver_register(&cros_platform_driver);
484 if (ret)
485 return ret;
486
487 cros_platform_device = platform_device_alloc("chromeos_laptop", -1);
488 if (!cros_platform_device) {
489 ret = -ENOMEM;
490 goto fail_platform_device1;
491 }
492
493 ret = platform_device_add(cros_platform_device);
494 if (ret)
495 goto fail_platform_device2;
496
497 return 0;
498
499fail_platform_device2:
500 platform_device_put(cros_platform_device);
501fail_platform_device1:
502 platform_driver_unregister(&cros_platform_driver);
503 return ret;
504}
505
506static void __exit chromeos_laptop_exit(void)
507{
508 if (als)
509 i2c_unregister_device(als);
510 if (tp)
511 i2c_unregister_device(tp);
512 if (ts)
513 i2c_unregister_device(ts);
514
515 platform_device_unregister(cros_platform_device);
516 platform_driver_unregister(&cros_platform_driver);
517}
518
519module_init(chromeos_laptop_init);
520module_exit(chromeos_laptop_exit);
521
522MODULE_DESCRIPTION("Chrome OS Laptop driver");
523MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
524MODULE_LICENSE("GPL");