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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/platform_data/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
40#define MAX_I2C_DEVICE_DEFERRALS 5
41
42static struct i2c_client *als;
43static struct i2c_client *tp;
44static struct i2c_client *ts;
45
46static const char *i2c_adapter_names[] = {
47 "SMBus I801 adapter",
48 "i915 gmbus vga",
49 "i915 gmbus panel",
50 "Synopsys DesignWare I2C adapter",
51 "Synopsys DesignWare I2C adapter",
52};
53
54/* Keep this enum consistent with i2c_adapter_names */
55enum i2c_adapter_type {
56 I2C_ADAPTER_SMBUS = 0,
57 I2C_ADAPTER_VGADDC,
58 I2C_ADAPTER_PANEL,
59 I2C_ADAPTER_DESIGNWARE_0,
60 I2C_ADAPTER_DESIGNWARE_1,
61};
62
63enum i2c_peripheral_state {
64 UNPROBED = 0,
65 PROBED,
66 TIMEDOUT,
67};
68
69struct i2c_peripheral {
70 int (*add)(enum i2c_adapter_type type);
71 enum i2c_adapter_type type;
72 enum i2c_peripheral_state state;
73 int tries;
74};
75
76#define MAX_I2C_PERIPHERALS 3
77
78struct chromeos_laptop {
79 struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
80};
81
82static struct chromeos_laptop *cros_laptop;
83
84static struct i2c_board_info cyapa_device = {
85 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
86 .flags = I2C_CLIENT_WAKE,
87};
88
89static struct i2c_board_info isl_als_device = {
90 I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
91};
92
93static struct i2c_board_info tsl2583_als_device = {
94 I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
95};
96
97static struct i2c_board_info tsl2563_als_device = {
98 I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
99};
100
101static int mxt_t19_keys[] = {
102 KEY_RESERVED,
103 KEY_RESERVED,
104 KEY_RESERVED,
105 KEY_RESERVED,
106 KEY_RESERVED,
107 BTN_LEFT
108};
109
110static struct mxt_platform_data atmel_224s_tp_platform_data = {
111 .irqflags = IRQF_TRIGGER_FALLING,
112 .t19_num_keys = ARRAY_SIZE(mxt_t19_keys),
113 .t19_keymap = mxt_t19_keys,
114 .suspend_mode = MXT_SUSPEND_T9_CTRL,
115};
116
117static struct i2c_board_info atmel_224s_tp_device = {
118 I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
119 .platform_data = &atmel_224s_tp_platform_data,
120 .flags = I2C_CLIENT_WAKE,
121};
122
123static struct mxt_platform_data atmel_1664s_platform_data = {
124 .irqflags = IRQF_TRIGGER_FALLING,
125 .suspend_mode = MXT_SUSPEND_T9_CTRL,
126};
127
128static struct i2c_board_info atmel_1664s_device = {
129 I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
130 .platform_data = &atmel_1664s_platform_data,
131 .flags = I2C_CLIENT_WAKE,
132};
133
134static struct i2c_client *__add_probed_i2c_device(
135 const char *name,
136 int bus,
137 struct i2c_board_info *info,
138 const unsigned short *alt_addr_list)
139{
140 const struct dmi_device *dmi_dev;
141 const struct dmi_dev_onboard *dev_data;
142 struct i2c_adapter *adapter;
143 struct i2c_client *client = NULL;
144 const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
145
146 if (bus < 0)
147 return NULL;
148 /*
149 * If a name is specified, look for irq platform information stashed
150 * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
151 */
152 if (name) {
153 dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
154 if (!dmi_dev) {
155 pr_err("%s failed to dmi find device %s.\n",
156 __func__,
157 name);
158 return NULL;
159 }
160 dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
161 if (!dev_data) {
162 pr_err("%s failed to get data from dmi for %s.\n",
163 __func__, name);
164 return NULL;
165 }
166 info->irq = dev_data->instance;
167 }
168
169 adapter = i2c_get_adapter(bus);
170 if (!adapter) {
171 pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
172 return NULL;
173 }
174
175 /*
176 * Add the i2c device. If we can't detect it at the primary
177 * address we scan secondary addresses. In any case the client
178 * structure gets assigned primary address.
179 */
180 client = i2c_new_probed_device(adapter, info, addr_list, NULL);
181 if (!client && alt_addr_list) {
182 struct i2c_board_info dummy_info = {
183 I2C_BOARD_INFO("dummy", info->addr),
184 };
185 struct i2c_client *dummy;
186
187 dummy = i2c_new_probed_device(adapter, &dummy_info,
188 alt_addr_list, NULL);
189 if (dummy) {
190 pr_debug("%s %d-%02x is probed at %02x\n",
191 __func__, bus, info->addr, dummy->addr);
192 i2c_unregister_device(dummy);
193 client = i2c_new_device(adapter, info);
194 }
195 }
196
197 if (!client)
198 pr_notice("%s failed to register device %d-%02x\n",
199 __func__, bus, info->addr);
200 else
201 pr_debug("%s added i2c device %d-%02x\n",
202 __func__, bus, info->addr);
203
204 i2c_put_adapter(adapter);
205 return client;
206}
207
208struct i2c_lookup {
209 const char *name;
210 int instance;
211 int n;
212};
213
214static int __find_i2c_adap(struct device *dev, void *data)
215{
216 struct i2c_lookup *lookup = data;
217 static const char *prefix = "i2c-";
218 struct i2c_adapter *adapter;
219
220 if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
221 return 0;
222 adapter = to_i2c_adapter(dev);
223 if (strncmp(adapter->name, lookup->name, strlen(lookup->name)) == 0 &&
224 lookup->n++ == lookup->instance)
225 return 1;
226 return 0;
227}
228
229static int find_i2c_adapter_num(enum i2c_adapter_type type)
230{
231 struct device *dev = NULL;
232 struct i2c_adapter *adapter;
233 struct i2c_lookup lookup;
234
235 memset(&lookup, 0, sizeof(lookup));
236 lookup.name = i2c_adapter_names[type];
237 lookup.instance = (type == I2C_ADAPTER_DESIGNWARE_1) ? 1 : 0;
238
239 /* find the adapter by name */
240 dev = bus_find_device(&i2c_bus_type, NULL, &lookup, __find_i2c_adap);
241 if (!dev) {
242 /* Adapters may appear later. Deferred probing will retry */
243 pr_notice("%s: i2c adapter %s not found on system.\n", __func__,
244 lookup.name);
245 return -ENODEV;
246 }
247 adapter = to_i2c_adapter(dev);
248 return adapter->nr;
249}
250
251/*
252 * Takes a list of addresses in addrs as such :
253 * { addr1, ... , addrn, I2C_CLIENT_END };
254 * add_probed_i2c_device will use i2c_new_probed_device
255 * and probe for devices at all of the addresses listed.
256 * Returns NULL if no devices found.
257 * See Documentation/i2c/instantiating-devices for more information.
258 */
259static struct i2c_client *add_probed_i2c_device(
260 const char *name,
261 enum i2c_adapter_type type,
262 struct i2c_board_info *info,
263 const unsigned short *addrs)
264{
265 return __add_probed_i2c_device(name,
266 find_i2c_adapter_num(type),
267 info,
268 addrs);
269}
270
271/*
272 * Probes for a device at a single address, the one provided by
273 * info->addr.
274 * Returns NULL if no device found.
275 */
276static struct i2c_client *add_i2c_device(const char *name,
277 enum i2c_adapter_type type,
278 struct i2c_board_info *info)
279{
280 return __add_probed_i2c_device(name,
281 find_i2c_adapter_num(type),
282 info,
283 NULL);
284}
285
286static int setup_cyapa_tp(enum i2c_adapter_type type)
287{
288 if (tp)
289 return 0;
290
291 /* add cyapa touchpad */
292 tp = add_i2c_device("trackpad", type, &cyapa_device);
293 return (!tp) ? -EAGAIN : 0;
294}
295
296static int setup_atmel_224s_tp(enum i2c_adapter_type type)
297{
298 const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
299 I2C_CLIENT_END };
300 if (tp)
301 return 0;
302
303 /* add atmel mxt touchpad */
304 tp = add_probed_i2c_device("trackpad", type,
305 &atmel_224s_tp_device, addr_list);
306 return (!tp) ? -EAGAIN : 0;
307}
308
309static int setup_atmel_1664s_ts(enum i2c_adapter_type type)
310{
311 const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
312 I2C_CLIENT_END };
313 if (ts)
314 return 0;
315
316 /* add atmel mxt touch device */
317 ts = add_probed_i2c_device("touchscreen", type,
318 &atmel_1664s_device, addr_list);
319 return (!ts) ? -EAGAIN : 0;
320}
321
322static int setup_isl29018_als(enum i2c_adapter_type type)
323{
324 if (als)
325 return 0;
326
327 /* add isl29018 light sensor */
328 als = add_i2c_device("lightsensor", type, &isl_als_device);
329 return (!als) ? -EAGAIN : 0;
330}
331
332static int setup_tsl2583_als(enum i2c_adapter_type type)
333{
334 if (als)
335 return 0;
336
337 /* add tsl2583 light sensor */
338 als = add_i2c_device(NULL, type, &tsl2583_als_device);
339 return (!als) ? -EAGAIN : 0;
340}
341
342static int setup_tsl2563_als(enum i2c_adapter_type type)
343{
344 if (als)
345 return 0;
346
347 /* add tsl2563 light sensor */
348 als = add_i2c_device(NULL, type, &tsl2563_als_device);
349 return (!als) ? -EAGAIN : 0;
350}
351
352static int __init chromeos_laptop_dmi_matched(const struct dmi_system_id *id)
353{
354 cros_laptop = (void *)id->driver_data;
355 pr_debug("DMI Matched %s.\n", id->ident);
356
357 /* Indicate to dmi_scan that processing is done. */
358 return 1;
359}
360
361static int chromeos_laptop_probe(struct platform_device *pdev)
362{
363 int i;
364 int ret = 0;
365
366 for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
367 struct i2c_peripheral *i2c_dev;
368
369 i2c_dev = &cros_laptop->i2c_peripherals[i];
370
371 /* No more peripherals. */
372 if (i2c_dev->add == NULL)
373 break;
374
375 if (i2c_dev->state == TIMEDOUT || i2c_dev->state == PROBED)
376 continue;
377
378 /*
379 * Check that the i2c adapter is present.
380 * -EPROBE_DEFER if missing as the adapter may appear much
381 * later.
382 */
383 if (find_i2c_adapter_num(i2c_dev->type) == -ENODEV) {
384 ret = -EPROBE_DEFER;
385 continue;
386 }
387
388 /* Add the device. */
389 if (i2c_dev->add(i2c_dev->type) == -EAGAIN) {
390 /*
391 * Set -EPROBE_DEFER a limited num of times
392 * if device is not successfully added.
393 */
394 if (++i2c_dev->tries < MAX_I2C_DEVICE_DEFERRALS) {
395 ret = -EPROBE_DEFER;
396 } else {
397 /* Ran out of tries. */
398 pr_notice("%s: Ran out of tries for device.\n",
399 __func__);
400 i2c_dev->state = TIMEDOUT;
401 }
402 } else {
403 i2c_dev->state = PROBED;
404 }
405 }
406
407 return ret;
408}
409
410static struct chromeos_laptop samsung_series_5_550 = {
411 .i2c_peripherals = {
412 /* Touchpad. */
413 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
414 /* Light Sensor. */
415 { .add = setup_isl29018_als, I2C_ADAPTER_SMBUS },
416 },
417};
418
419static struct chromeos_laptop samsung_series_5 = {
420 .i2c_peripherals = {
421 /* Light Sensor. */
422 { .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
423 },
424};
425
426static struct chromeos_laptop chromebook_pixel = {
427 .i2c_peripherals = {
428 /* Touch Screen. */
429 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_PANEL },
430 /* Touchpad. */
431 { .add = setup_atmel_224s_tp, I2C_ADAPTER_VGADDC },
432 /* Light Sensor. */
433 { .add = setup_isl29018_als, I2C_ADAPTER_PANEL },
434 },
435};
436
437static struct chromeos_laptop hp_chromebook_14 = {
438 .i2c_peripherals = {
439 /* Touchpad. */
440 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
441 },
442};
443
444static struct chromeos_laptop dell_chromebook_11 = {
445 .i2c_peripherals = {
446 /* Touchpad. */
447 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
448 },
449};
450
451static struct chromeos_laptop toshiba_cb35 = {
452 .i2c_peripherals = {
453 /* Touchpad. */
454 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
455 },
456};
457
458static struct chromeos_laptop acer_c7_chromebook = {
459 .i2c_peripherals = {
460 /* Touchpad. */
461 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
462 },
463};
464
465static struct chromeos_laptop acer_ac700 = {
466 .i2c_peripherals = {
467 /* Light Sensor. */
468 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
469 },
470};
471
472static struct chromeos_laptop acer_c720 = {
473 .i2c_peripherals = {
474 /* Touchscreen. */
475 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_DESIGNWARE_1 },
476 /* Touchpad. */
477 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
478 /* Light Sensor. */
479 { .add = setup_isl29018_als, I2C_ADAPTER_DESIGNWARE_1 },
480 },
481};
482
483static struct chromeos_laptop hp_pavilion_14_chromebook = {
484 .i2c_peripherals = {
485 /* Touchpad. */
486 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
487 },
488};
489
490static struct chromeos_laptop cr48 = {
491 .i2c_peripherals = {
492 /* Light Sensor. */
493 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
494 },
495};
496
497#define _CBDD(board_) \
498 .callback = chromeos_laptop_dmi_matched, \
499 .driver_data = (void *)&board_
500
501static struct dmi_system_id chromeos_laptop_dmi_table[] __initdata = {
502 {
503 .ident = "Samsung Series 5 550",
504 .matches = {
505 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
506 DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
507 },
508 _CBDD(samsung_series_5_550),
509 },
510 {
511 .ident = "Samsung Series 5",
512 .matches = {
513 DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
514 },
515 _CBDD(samsung_series_5),
516 },
517 {
518 .ident = "Chromebook Pixel",
519 .matches = {
520 DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
521 DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
522 },
523 _CBDD(chromebook_pixel),
524 },
525 {
526 .ident = "Wolf",
527 .matches = {
528 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
529 DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
530 },
531 _CBDD(dell_chromebook_11),
532 },
533 {
534 .ident = "HP Chromebook 14",
535 .matches = {
536 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
537 DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
538 },
539 _CBDD(hp_chromebook_14),
540 },
541 {
542 .ident = "Toshiba CB35",
543 .matches = {
544 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
545 DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
546 },
547 _CBDD(toshiba_cb35),
548 },
549 {
550 .ident = "Acer C7 Chromebook",
551 .matches = {
552 DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
553 },
554 _CBDD(acer_c7_chromebook),
555 },
556 {
557 .ident = "Acer AC700",
558 .matches = {
559 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
560 },
561 _CBDD(acer_ac700),
562 },
563 {
564 .ident = "Acer C720",
565 .matches = {
566 DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
567 },
568 _CBDD(acer_c720),
569 },
570 {
571 .ident = "HP Pavilion 14 Chromebook",
572 .matches = {
573 DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
574 },
575 _CBDD(hp_pavilion_14_chromebook),
576 },
577 {
578 .ident = "Cr-48",
579 .matches = {
580 DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
581 },
582 _CBDD(cr48),
583 },
584 { }
585};
586MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
587
588static struct platform_device *cros_platform_device;
589
590static struct platform_driver cros_platform_driver = {
591 .driver = {
592 .name = "chromeos_laptop",
593 },
594 .probe = chromeos_laptop_probe,
595};
596
597static int __init chromeos_laptop_init(void)
598{
599 int ret;
600
601 if (!dmi_check_system(chromeos_laptop_dmi_table)) {
602 pr_debug("%s unsupported system.\n", __func__);
603 return -ENODEV;
604 }
605
606 ret = platform_driver_register(&cros_platform_driver);
607 if (ret)
608 return ret;
609
610 cros_platform_device = platform_device_alloc("chromeos_laptop", -1);
611 if (!cros_platform_device) {
612 ret = -ENOMEM;
613 goto fail_platform_device1;
614 }
615
616 ret = platform_device_add(cros_platform_device);
617 if (ret)
618 goto fail_platform_device2;
619
620 return 0;
621
622fail_platform_device2:
623 platform_device_put(cros_platform_device);
624fail_platform_device1:
625 platform_driver_unregister(&cros_platform_driver);
626 return ret;
627}
628
629static void __exit chromeos_laptop_exit(void)
630{
631 if (als)
632 i2c_unregister_device(als);
633 if (tp)
634 i2c_unregister_device(tp);
635 if (ts)
636 i2c_unregister_device(ts);
637
638 platform_device_unregister(cros_platform_device);
639 platform_driver_unregister(&cros_platform_driver);
640}
641
642module_init(chromeos_laptop_init);
643module_exit(chromeos_laptop_exit);
644
645MODULE_DESCRIPTION("Chrome OS Laptop driver");
646MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
647MODULE_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/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 struct i2c_client *client;
56};
57
58struct acpi_peripheral {
59 char hid[ACPI_ID_LEN];
60 const struct property_entry *properties;
61};
62
63struct 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
75static const struct chromeos_laptop *cros_laptop;
76
77static struct i2c_client *
78chromes_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
122static 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
133static 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
162static 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
194static 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
207static 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
229static struct notifier_block chromeos_laptop_i2c_notifier = {
230 .notifier_call = chromeos_laptop_i2c_notifier_call,
231};
232
233#define DECLARE_CROS_LAPTOP(_name) \
234static 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) \
240static const struct chromeos_laptop _name __initconst = { \
241 .acpi_peripherals = _name##_peripherals, \
242 .num_acpi_peripherals = ARRAY_SIZE(_name##_peripherals), \
243}
244
245static 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};
264DECLARE_CROS_LAPTOP(samsung_series_5_550);
265
266static 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};
275DECLARE_CROS_LAPTOP(samsung_series_5);
276
277static 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
286static const struct property_entry
287chromebook_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
293static const struct property_entry
294chromebook_atmel_touchscreen_props[] __initconst = {
295 PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
296 { }
297};
298
299static 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};
337DECLARE_CROS_LAPTOP(chromebook_pixel);
338
339static 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};
350DECLARE_CROS_LAPTOP(hp_chromebook_14);
351
352static 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};
372DECLARE_CROS_LAPTOP(dell_chromebook_11);
373
374static 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};
385DECLARE_CROS_LAPTOP(toshiba_cb35);
386
387static 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};
398DECLARE_CROS_LAPTOP(acer_c7_chromebook);
399
400static 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};
409DECLARE_CROS_LAPTOP(acer_ac700);
410
411static 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};
457DECLARE_CROS_LAPTOP(acer_c720);
458
459static struct i2c_peripheral
460hp_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};
471DECLARE_CROS_LAPTOP(hp_pavilion_14_chromebook);
472
473static 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};
482DECLARE_CROS_LAPTOP(cr48);
483
484static const u32 samus_touchpad_buttons[] __initconst = {
485 KEY_RESERVED,
486 KEY_RESERVED,
487 KEY_RESERVED,
488 BTN_LEFT
489};
490
491static 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
497static 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};
509DECLARE_ACPI_CROS_LAPTOP(samus);
510
511static 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};
523DECLARE_ACPI_CROS_LAPTOP(generic_atmel);
524
525static 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};
652MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
653
654static 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
678static 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
698static 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
717static int __init
718chromeos_laptop_prepare_i2c_peripherals(struct chromeos_laptop *cros_laptop,
719 const struct chromeos_laptop *src)
720{
721 struct i2c_peripheral *i2c_dev;
722 struct i2c_board_info *info;
723 int i;
724 int error;
725
726 if (!src->num_i2c_peripherals)
727 return 0;
728
729 cros_laptop->i2c_peripherals = kmemdup(src->i2c_peripherals,
730 src->num_i2c_peripherals *
731 sizeof(*src->i2c_peripherals),
732 GFP_KERNEL);
733 if (!cros_laptop->i2c_peripherals)
734 return -ENOMEM;
735
736 cros_laptop->num_i2c_peripherals = src->num_i2c_peripherals;
737
738 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
739 i2c_dev = &cros_laptop->i2c_peripherals[i];
740 info = &i2c_dev->board_info;
741
742 error = chromeos_laptop_setup_irq(i2c_dev);
743 if (error)
744 goto err_out;
745
746 /* We need to deep-copy properties */
747 if (info->properties) {
748 info->properties =
749 property_entries_dup(info->properties);
750 if (IS_ERR(info->properties)) {
751 error = PTR_ERR(info->properties);
752 goto err_out;
753 }
754 }
755 }
756
757 return 0;
758
759err_out:
760 while (--i >= 0) {
761 i2c_dev = &cros_laptop->i2c_peripherals[i];
762 info = &i2c_dev->board_info;
763 if (info->properties)
764 property_entries_free(info->properties);
765 }
766 kfree(cros_laptop->i2c_peripherals);
767 return error;
768}
769
770static int __init
771chromeos_laptop_prepare_acpi_peripherals(struct chromeos_laptop *cros_laptop,
772 const struct chromeos_laptop *src)
773{
774 struct acpi_peripheral *acpi_peripherals;
775 struct acpi_peripheral *acpi_dev;
776 const struct acpi_peripheral *src_dev;
777 int n_peripherals = 0;
778 int i;
779 int error;
780
781 for (i = 0; i < src->num_acpi_peripherals; i++) {
782 if (acpi_dev_present(src->acpi_peripherals[i].hid, NULL, -1))
783 n_peripherals++;
784 }
785
786 if (!n_peripherals)
787 return 0;
788
789 acpi_peripherals = kcalloc(n_peripherals,
790 sizeof(*src->acpi_peripherals),
791 GFP_KERNEL);
792 if (!acpi_peripherals)
793 return -ENOMEM;
794
795 acpi_dev = acpi_peripherals;
796 for (i = 0; i < src->num_acpi_peripherals; i++) {
797 src_dev = &src->acpi_peripherals[i];
798 if (!acpi_dev_present(src_dev->hid, NULL, -1))
799 continue;
800
801 *acpi_dev = *src_dev;
802
803 /* We need to deep-copy properties */
804 if (src_dev->properties) {
805 acpi_dev->properties =
806 property_entries_dup(src_dev->properties);
807 if (IS_ERR(acpi_dev->properties)) {
808 error = PTR_ERR(acpi_dev->properties);
809 goto err_out;
810 }
811 }
812
813 acpi_dev++;
814 }
815
816 cros_laptop->acpi_peripherals = acpi_peripherals;
817 cros_laptop->num_acpi_peripherals = n_peripherals;
818
819 return 0;
820
821err_out:
822 while (--i >= 0) {
823 acpi_dev = &acpi_peripherals[i];
824 if (acpi_dev->properties)
825 property_entries_free(acpi_dev->properties);
826 }
827
828 kfree(acpi_peripherals);
829 return error;
830}
831
832static void chromeos_laptop_destroy(const struct chromeos_laptop *cros_laptop)
833{
834 const struct acpi_peripheral *acpi_dev;
835 struct i2c_peripheral *i2c_dev;
836 struct i2c_board_info *info;
837 int i;
838
839 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
840 i2c_dev = &cros_laptop->i2c_peripherals[i];
841 info = &i2c_dev->board_info;
842
843 i2c_unregister_device(i2c_dev->client);
844 property_entries_free(info->properties);
845 }
846
847 for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
848 acpi_dev = &cros_laptop->acpi_peripherals[i];
849
850 property_entries_free(acpi_dev->properties);
851 }
852
853 kfree(cros_laptop->i2c_peripherals);
854 kfree(cros_laptop->acpi_peripherals);
855 kfree(cros_laptop);
856}
857
858static struct chromeos_laptop * __init
859chromeos_laptop_prepare(const struct chromeos_laptop *src)
860{
861 struct chromeos_laptop *cros_laptop;
862 int error;
863
864 cros_laptop = kzalloc(sizeof(*cros_laptop), GFP_KERNEL);
865 if (!cros_laptop)
866 return ERR_PTR(-ENOMEM);
867
868 error = chromeos_laptop_prepare_i2c_peripherals(cros_laptop, src);
869 if (!error)
870 error = chromeos_laptop_prepare_acpi_peripherals(cros_laptop,
871 src);
872
873 if (error) {
874 chromeos_laptop_destroy(cros_laptop);
875 return ERR_PTR(error);
876 }
877
878 return cros_laptop;
879}
880
881static int __init chromeos_laptop_init(void)
882{
883 const struct dmi_system_id *dmi_id;
884 int error;
885
886 dmi_id = dmi_first_match(chromeos_laptop_dmi_table);
887 if (!dmi_id) {
888 pr_debug("unsupported system\n");
889 return -ENODEV;
890 }
891
892 pr_debug("DMI Matched %s\n", dmi_id->ident);
893
894 cros_laptop = chromeos_laptop_prepare((void *)dmi_id->driver_data);
895 if (IS_ERR(cros_laptop))
896 return PTR_ERR(cros_laptop);
897
898 if (!cros_laptop->num_i2c_peripherals &&
899 !cros_laptop->num_acpi_peripherals) {
900 pr_debug("no relevant devices detected\n");
901 error = -ENODEV;
902 goto err_destroy_cros_laptop;
903 }
904
905 error = bus_register_notifier(&i2c_bus_type,
906 &chromeos_laptop_i2c_notifier);
907 if (error) {
908 pr_err("failed to register i2c bus notifier: %d\n",
909 error);
910 goto err_destroy_cros_laptop;
911 }
912
913 /*
914 * Scan adapters that have been registered and clients that have
915 * been created before we installed the notifier to make sure
916 * we do not miss any devices.
917 */
918 i2c_for_each_dev(NULL, chromeos_laptop_scan_peripherals);
919
920 return 0;
921
922err_destroy_cros_laptop:
923 chromeos_laptop_destroy(cros_laptop);
924 return error;
925}
926
927static void __exit chromeos_laptop_exit(void)
928{
929 bus_unregister_notifier(&i2c_bus_type, &chromeos_laptop_i2c_notifier);
930 chromeos_laptop_destroy(cros_laptop);
931}
932
933module_init(chromeos_laptop_init);
934module_exit(chromeos_laptop_exit);
935
936MODULE_DESCRIPTION("Chrome OS Laptop driver");
937MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
938MODULE_LICENSE("GPL");