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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 const struct property_entry *properties;
56
57 struct i2c_client *client;
58};
59
60struct acpi_peripheral {
61 char hid[ACPI_ID_LEN];
62 struct software_node swnode;
63 struct i2c_client *client;
64};
65
66struct chromeos_laptop {
67 /*
68 * Note that we can't mark this pointer as const because
69 * i2c_new_scanned_device() changes passed in I2C board info, so.
70 */
71 struct i2c_peripheral *i2c_peripherals;
72 unsigned int num_i2c_peripherals;
73
74 struct acpi_peripheral *acpi_peripherals;
75 unsigned int num_acpi_peripherals;
76};
77
78static const struct chromeos_laptop *cros_laptop;
79
80static struct i2c_client *
81chromes_laptop_instantiate_i2c_device(struct i2c_adapter *adapter,
82 struct i2c_board_info *info,
83 unsigned short alt_addr)
84{
85 const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
86 struct i2c_client *client;
87
88 /*
89 * Add the i2c device. If we can't detect it at the primary
90 * address we scan secondary addresses. In any case the client
91 * structure gets assigned primary address.
92 */
93 client = i2c_new_scanned_device(adapter, info, addr_list, NULL);
94 if (IS_ERR(client) && alt_addr) {
95 struct i2c_board_info dummy_info = {
96 I2C_BOARD_INFO("dummy", info->addr),
97 };
98 const unsigned short alt_addr_list[] = {
99 alt_addr, I2C_CLIENT_END
100 };
101 struct i2c_client *dummy;
102
103 dummy = i2c_new_scanned_device(adapter, &dummy_info,
104 alt_addr_list, NULL);
105 if (!IS_ERR(dummy)) {
106 pr_debug("%d-%02x is probed at %02x\n",
107 adapter->nr, info->addr, dummy->addr);
108 i2c_unregister_device(dummy);
109 client = i2c_new_client_device(adapter, info);
110 }
111 }
112
113 if (IS_ERR(client)) {
114 client = NULL;
115 pr_debug("failed to register device %d-%02x\n",
116 adapter->nr, info->addr);
117 } else {
118 pr_debug("added i2c device %d-%02x\n",
119 adapter->nr, info->addr);
120 }
121
122 return client;
123}
124
125static bool chromeos_laptop_match_adapter_devid(struct device *dev, u32 devid)
126{
127 struct pci_dev *pdev;
128
129 if (!dev_is_pci(dev))
130 return false;
131
132 pdev = to_pci_dev(dev);
133 return devid == pci_dev_id(pdev);
134}
135
136static void chromeos_laptop_check_adapter(struct i2c_adapter *adapter)
137{
138 struct i2c_peripheral *i2c_dev;
139 int i;
140
141 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
142 i2c_dev = &cros_laptop->i2c_peripherals[i];
143
144 /* Skip devices already created */
145 if (i2c_dev->client)
146 continue;
147
148 if (strncmp(adapter->name, i2c_adapter_names[i2c_dev->type],
149 strlen(i2c_adapter_names[i2c_dev->type])))
150 continue;
151
152 if (i2c_dev->pci_devid &&
153 !chromeos_laptop_match_adapter_devid(adapter->dev.parent,
154 i2c_dev->pci_devid)) {
155 continue;
156 }
157
158 i2c_dev->client =
159 chromes_laptop_instantiate_i2c_device(adapter,
160 &i2c_dev->board_info,
161 i2c_dev->alt_addr);
162 }
163}
164
165static bool chromeos_laptop_adjust_client(struct i2c_client *client)
166{
167 struct acpi_peripheral *acpi_dev;
168 struct acpi_device_id acpi_ids[2] = { };
169 int i;
170 int error;
171
172 if (!has_acpi_companion(&client->dev))
173 return false;
174
175 for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
176 acpi_dev = &cros_laptop->acpi_peripherals[i];
177
178 memcpy(acpi_ids[0].id, acpi_dev->hid, ACPI_ID_LEN);
179
180 if (acpi_match_device(acpi_ids, &client->dev)) {
181 error = device_add_software_node(&client->dev, &acpi_dev->swnode);
182 if (error) {
183 dev_err(&client->dev,
184 "failed to add properties: %d\n",
185 error);
186 break;
187 }
188
189 acpi_dev->client = client;
190
191 return true;
192 }
193 }
194
195 return false;
196}
197
198static void chromeos_laptop_detach_i2c_client(struct i2c_client *client)
199{
200 struct acpi_peripheral *acpi_dev;
201 struct i2c_peripheral *i2c_dev;
202 int i;
203
204 if (has_acpi_companion(&client->dev))
205 for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
206 acpi_dev = &cros_laptop->acpi_peripherals[i];
207
208 if (acpi_dev->client == client) {
209 acpi_dev->client = NULL;
210 return;
211 }
212 }
213 else
214 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
215 i2c_dev = &cros_laptop->i2c_peripherals[i];
216
217 if (i2c_dev->client == client) {
218 i2c_dev->client = NULL;
219 return;
220 }
221 }
222}
223
224static int chromeos_laptop_i2c_notifier_call(struct notifier_block *nb,
225 unsigned long action, void *data)
226{
227 struct device *dev = data;
228
229 switch (action) {
230 case BUS_NOTIFY_ADD_DEVICE:
231 if (dev->type == &i2c_adapter_type)
232 chromeos_laptop_check_adapter(to_i2c_adapter(dev));
233 else if (dev->type == &i2c_client_type)
234 chromeos_laptop_adjust_client(to_i2c_client(dev));
235 break;
236
237 case BUS_NOTIFY_REMOVED_DEVICE:
238 if (dev->type == &i2c_client_type)
239 chromeos_laptop_detach_i2c_client(to_i2c_client(dev));
240 break;
241 }
242
243 return 0;
244}
245
246static struct notifier_block chromeos_laptop_i2c_notifier = {
247 .notifier_call = chromeos_laptop_i2c_notifier_call,
248};
249
250#define DECLARE_CROS_LAPTOP(_name) \
251static const struct chromeos_laptop _name __initconst = { \
252 .i2c_peripherals = _name##_peripherals, \
253 .num_i2c_peripherals = ARRAY_SIZE(_name##_peripherals), \
254}
255
256#define DECLARE_ACPI_CROS_LAPTOP(_name) \
257static const struct chromeos_laptop _name __initconst = { \
258 .acpi_peripherals = _name##_peripherals, \
259 .num_acpi_peripherals = ARRAY_SIZE(_name##_peripherals), \
260}
261
262static struct i2c_peripheral samsung_series_5_550_peripherals[] __initdata = {
263 /* Touchpad. */
264 {
265 .board_info = {
266 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
267 .flags = I2C_CLIENT_WAKE,
268 },
269 .dmi_name = "trackpad",
270 .type = I2C_ADAPTER_SMBUS,
271 },
272 /* Light Sensor. */
273 {
274 .board_info = {
275 I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
276 },
277 .dmi_name = "lightsensor",
278 .type = I2C_ADAPTER_SMBUS,
279 },
280};
281DECLARE_CROS_LAPTOP(samsung_series_5_550);
282
283static struct i2c_peripheral samsung_series_5_peripherals[] __initdata = {
284 /* Light Sensor. */
285 {
286 .board_info = {
287 I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
288 },
289 .type = I2C_ADAPTER_SMBUS,
290 },
291};
292DECLARE_CROS_LAPTOP(samsung_series_5);
293
294static const int chromebook_pixel_tp_keys[] __initconst = {
295 KEY_RESERVED,
296 KEY_RESERVED,
297 KEY_RESERVED,
298 KEY_RESERVED,
299 KEY_RESERVED,
300 BTN_LEFT
301};
302
303static const struct property_entry
304chromebook_pixel_trackpad_props[] __initconst = {
305 PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
306 PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", chromebook_pixel_tp_keys),
307 { }
308};
309
310static const struct property_entry
311chromebook_atmel_touchscreen_props[] __initconst = {
312 PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
313 { }
314};
315
316static struct i2c_peripheral chromebook_pixel_peripherals[] __initdata = {
317 /* Touch Screen. */
318 {
319 .board_info = {
320 I2C_BOARD_INFO("atmel_mxt_ts",
321 ATMEL_TS_I2C_ADDR),
322 .flags = I2C_CLIENT_WAKE,
323 },
324 .dmi_name = "touchscreen",
325 .irqflags = IRQF_TRIGGER_FALLING,
326 .type = I2C_ADAPTER_PANEL,
327 .alt_addr = ATMEL_TS_I2C_BL_ADDR,
328 .properties = chromebook_atmel_touchscreen_props,
329 },
330 /* Touchpad. */
331 {
332 .board_info = {
333 I2C_BOARD_INFO("atmel_mxt_tp",
334 ATMEL_TP_I2C_ADDR),
335 .flags = I2C_CLIENT_WAKE,
336 },
337 .dmi_name = "trackpad",
338 .irqflags = IRQF_TRIGGER_FALLING,
339 .type = I2C_ADAPTER_VGADDC,
340 .alt_addr = ATMEL_TP_I2C_BL_ADDR,
341 .properties = chromebook_pixel_trackpad_props,
342 },
343 /* Light Sensor. */
344 {
345 .board_info = {
346 I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
347 },
348 .dmi_name = "lightsensor",
349 .type = I2C_ADAPTER_PANEL,
350 },
351};
352DECLARE_CROS_LAPTOP(chromebook_pixel);
353
354static struct i2c_peripheral hp_chromebook_14_peripherals[] __initdata = {
355 /* Touchpad. */
356 {
357 .board_info = {
358 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
359 .flags = I2C_CLIENT_WAKE,
360 },
361 .dmi_name = "trackpad",
362 .type = I2C_ADAPTER_DESIGNWARE,
363 },
364};
365DECLARE_CROS_LAPTOP(hp_chromebook_14);
366
367static struct i2c_peripheral dell_chromebook_11_peripherals[] __initdata = {
368 /* Touchpad. */
369 {
370 .board_info = {
371 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
372 .flags = I2C_CLIENT_WAKE,
373 },
374 .dmi_name = "trackpad",
375 .type = I2C_ADAPTER_DESIGNWARE,
376 },
377 /* Elan Touchpad option. */
378 {
379 .board_info = {
380 I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
381 .flags = I2C_CLIENT_WAKE,
382 },
383 .dmi_name = "trackpad",
384 .type = I2C_ADAPTER_DESIGNWARE,
385 },
386};
387DECLARE_CROS_LAPTOP(dell_chromebook_11);
388
389static struct i2c_peripheral toshiba_cb35_peripherals[] __initdata = {
390 /* Touchpad. */
391 {
392 .board_info = {
393 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
394 .flags = I2C_CLIENT_WAKE,
395 },
396 .dmi_name = "trackpad",
397 .type = I2C_ADAPTER_DESIGNWARE,
398 },
399};
400DECLARE_CROS_LAPTOP(toshiba_cb35);
401
402static struct i2c_peripheral acer_c7_chromebook_peripherals[] __initdata = {
403 /* Touchpad. */
404 {
405 .board_info = {
406 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
407 .flags = I2C_CLIENT_WAKE,
408 },
409 .dmi_name = "trackpad",
410 .type = I2C_ADAPTER_SMBUS,
411 },
412};
413DECLARE_CROS_LAPTOP(acer_c7_chromebook);
414
415static struct i2c_peripheral acer_ac700_peripherals[] __initdata = {
416 /* Light Sensor. */
417 {
418 .board_info = {
419 I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
420 },
421 .type = I2C_ADAPTER_SMBUS,
422 },
423};
424DECLARE_CROS_LAPTOP(acer_ac700);
425
426static struct i2c_peripheral acer_c720_peripherals[] __initdata = {
427 /* Touchscreen. */
428 {
429 .board_info = {
430 I2C_BOARD_INFO("atmel_mxt_ts",
431 ATMEL_TS_I2C_ADDR),
432 .flags = I2C_CLIENT_WAKE,
433 },
434 .dmi_name = "touchscreen",
435 .irqflags = IRQF_TRIGGER_FALLING,
436 .type = I2C_ADAPTER_DESIGNWARE,
437 .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
438 .alt_addr = ATMEL_TS_I2C_BL_ADDR,
439 .properties = chromebook_atmel_touchscreen_props,
440 },
441 /* Touchpad. */
442 {
443 .board_info = {
444 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
445 .flags = I2C_CLIENT_WAKE,
446 },
447 .dmi_name = "trackpad",
448 .type = I2C_ADAPTER_DESIGNWARE,
449 .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
450 },
451 /* Elan Touchpad option. */
452 {
453 .board_info = {
454 I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
455 .flags = I2C_CLIENT_WAKE,
456 },
457 .dmi_name = "trackpad",
458 .type = I2C_ADAPTER_DESIGNWARE,
459 .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
460 },
461 /* Light Sensor. */
462 {
463 .board_info = {
464 I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
465 },
466 .dmi_name = "lightsensor",
467 .type = I2C_ADAPTER_DESIGNWARE,
468 .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
469 },
470};
471DECLARE_CROS_LAPTOP(acer_c720);
472
473static struct i2c_peripheral
474hp_pavilion_14_chromebook_peripherals[] __initdata = {
475 /* Touchpad. */
476 {
477 .board_info = {
478 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
479 .flags = I2C_CLIENT_WAKE,
480 },
481 .dmi_name = "trackpad",
482 .type = I2C_ADAPTER_SMBUS,
483 },
484};
485DECLARE_CROS_LAPTOP(hp_pavilion_14_chromebook);
486
487static struct i2c_peripheral cr48_peripherals[] __initdata = {
488 /* Light Sensor. */
489 {
490 .board_info = {
491 I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
492 },
493 .type = I2C_ADAPTER_SMBUS,
494 },
495};
496DECLARE_CROS_LAPTOP(cr48);
497
498static const u32 samus_touchpad_buttons[] __initconst = {
499 KEY_RESERVED,
500 KEY_RESERVED,
501 KEY_RESERVED,
502 BTN_LEFT
503};
504
505static const struct property_entry samus_trackpad_props[] __initconst = {
506 PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
507 PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", samus_touchpad_buttons),
508 { }
509};
510
511static struct acpi_peripheral samus_peripherals[] __initdata = {
512 /* Touchpad */
513 {
514 .hid = "ATML0000",
515 .swnode = {
516 .properties = samus_trackpad_props,
517 },
518 },
519 /* Touchsceen */
520 {
521 .hid = "ATML0001",
522 .swnode = {
523 .properties = chromebook_atmel_touchscreen_props,
524 },
525 },
526};
527DECLARE_ACPI_CROS_LAPTOP(samus);
528
529static struct acpi_peripheral generic_atmel_peripherals[] __initdata = {
530 /* Touchpad */
531 {
532 .hid = "ATML0000",
533 .swnode = {
534 .properties = chromebook_pixel_trackpad_props,
535 },
536 },
537 /* Touchsceen */
538 {
539 .hid = "ATML0001",
540 .swnode = {
541 .properties = chromebook_atmel_touchscreen_props,
542 },
543 },
544};
545DECLARE_ACPI_CROS_LAPTOP(generic_atmel);
546
547static const struct dmi_system_id chromeos_laptop_dmi_table[] __initconst = {
548 {
549 .ident = "Samsung Series 5 550",
550 .matches = {
551 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
552 DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
553 },
554 .driver_data = (void *)&samsung_series_5_550,
555 },
556 {
557 .ident = "Samsung Series 5",
558 .matches = {
559 DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
560 },
561 .driver_data = (void *)&samsung_series_5,
562 },
563 {
564 .ident = "Chromebook Pixel",
565 .matches = {
566 DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
567 DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
568 },
569 .driver_data = (void *)&chromebook_pixel,
570 },
571 {
572 .ident = "Wolf",
573 .matches = {
574 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
575 DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
576 },
577 .driver_data = (void *)&dell_chromebook_11,
578 },
579 {
580 .ident = "HP Chromebook 14",
581 .matches = {
582 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
583 DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
584 },
585 .driver_data = (void *)&hp_chromebook_14,
586 },
587 {
588 .ident = "Toshiba CB35",
589 .matches = {
590 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
591 DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
592 },
593 .driver_data = (void *)&toshiba_cb35,
594 },
595 {
596 .ident = "Acer C7 Chromebook",
597 .matches = {
598 DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
599 },
600 .driver_data = (void *)&acer_c7_chromebook,
601 },
602 {
603 .ident = "Acer AC700",
604 .matches = {
605 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
606 },
607 .driver_data = (void *)&acer_ac700,
608 },
609 {
610 .ident = "Acer C720",
611 .matches = {
612 DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
613 },
614 .driver_data = (void *)&acer_c720,
615 },
616 {
617 .ident = "HP Pavilion 14 Chromebook",
618 .matches = {
619 DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
620 },
621 .driver_data = (void *)&hp_pavilion_14_chromebook,
622 },
623 {
624 .ident = "Cr-48",
625 .matches = {
626 DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
627 },
628 .driver_data = (void *)&cr48,
629 },
630 /* Devices with peripherals incompletely described in ACPI */
631 {
632 .ident = "Chromebook Pro",
633 .matches = {
634 DMI_MATCH(DMI_SYS_VENDOR, "Google"),
635 DMI_MATCH(DMI_PRODUCT_NAME, "Caroline"),
636 },
637 .driver_data = (void *)&samus,
638 },
639 {
640 .ident = "Google Pixel 2 (2015)",
641 .matches = {
642 DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
643 DMI_MATCH(DMI_PRODUCT_NAME, "Samus"),
644 },
645 .driver_data = (void *)&samus,
646 },
647 {
648 .ident = "Samsung Chromebook 3",
649 .matches = {
650 DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
651 DMI_MATCH(DMI_PRODUCT_NAME, "Celes"),
652 },
653 .driver_data = (void *)&samus,
654 },
655 {
656 /*
657 * Other Chromebooks with Atmel touch controllers:
658 * - Winky (touchpad)
659 * - Clapper, Expresso, Rambi, Glimmer (touchscreen)
660 */
661 .ident = "Other Chromebook",
662 .matches = {
663 /*
664 * This will match all Google devices, not only devices
665 * with Atmel, but we will validate that the device
666 * actually has matching peripherals.
667 */
668 DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
669 },
670 .driver_data = (void *)&generic_atmel,
671 },
672 { }
673};
674MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
675
676static int __init chromeos_laptop_scan_peripherals(struct device *dev, void *data)
677{
678 int error;
679
680 if (dev->type == &i2c_adapter_type) {
681 chromeos_laptop_check_adapter(to_i2c_adapter(dev));
682 } else if (dev->type == &i2c_client_type) {
683 if (chromeos_laptop_adjust_client(to_i2c_client(dev))) {
684 /*
685 * Now that we have needed properties re-trigger
686 * driver probe in case driver was initialized
687 * earlier and probe failed.
688 */
689 error = device_attach(dev);
690 if (error < 0)
691 dev_warn(dev,
692 "%s: device_attach() failed: %d\n",
693 __func__, error);
694 }
695 }
696
697 return 0;
698}
699
700static int __init chromeos_laptop_get_irq_from_dmi(const char *dmi_name)
701{
702 const struct dmi_device *dmi_dev;
703 const struct dmi_dev_onboard *dev_data;
704
705 dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, dmi_name, NULL);
706 if (!dmi_dev) {
707 pr_err("failed to find DMI device '%s'\n", dmi_name);
708 return -ENOENT;
709 }
710
711 dev_data = dmi_dev->device_data;
712 if (!dev_data) {
713 pr_err("failed to get data from DMI for '%s'\n", dmi_name);
714 return -EINVAL;
715 }
716
717 return dev_data->instance;
718}
719
720static int __init chromeos_laptop_setup_irq(struct i2c_peripheral *i2c_dev)
721{
722 int irq;
723
724 if (i2c_dev->dmi_name) {
725 irq = chromeos_laptop_get_irq_from_dmi(i2c_dev->dmi_name);
726 if (irq < 0)
727 return irq;
728
729 i2c_dev->irq_resource = (struct resource)
730 DEFINE_RES_NAMED(irq, 1, NULL,
731 IORESOURCE_IRQ | i2c_dev->irqflags);
732 i2c_dev->board_info.resources = &i2c_dev->irq_resource;
733 i2c_dev->board_info.num_resources = 1;
734 }
735
736 return 0;
737}
738
739static int __init
740chromeos_laptop_prepare_i2c_peripherals(struct chromeos_laptop *cros_laptop,
741 const struct chromeos_laptop *src)
742{
743 struct i2c_peripheral *i2c_peripherals;
744 struct i2c_peripheral *i2c_dev;
745 struct i2c_board_info *info;
746 int i;
747 int error;
748
749 if (!src->num_i2c_peripherals)
750 return 0;
751
752 i2c_peripherals = kmemdup(src->i2c_peripherals,
753 src->num_i2c_peripherals *
754 sizeof(*src->i2c_peripherals),
755 GFP_KERNEL);
756 if (!i2c_peripherals)
757 return -ENOMEM;
758
759 for (i = 0; i < src->num_i2c_peripherals; i++) {
760 i2c_dev = &i2c_peripherals[i];
761 info = &i2c_dev->board_info;
762
763 error = chromeos_laptop_setup_irq(i2c_dev);
764 if (error)
765 goto err_out;
766
767 /* Create primary fwnode for the device - copies everything */
768 if (i2c_dev->properties) {
769 info->fwnode = fwnode_create_software_node(i2c_dev->properties, NULL);
770 if (IS_ERR(info->fwnode)) {
771 error = PTR_ERR(info->fwnode);
772 goto err_out;
773 }
774 }
775 }
776
777 cros_laptop->i2c_peripherals = i2c_peripherals;
778 cros_laptop->num_i2c_peripherals = src->num_i2c_peripherals;
779
780 return 0;
781
782err_out:
783 while (--i >= 0) {
784 i2c_dev = &i2c_peripherals[i];
785 info = &i2c_dev->board_info;
786 if (!IS_ERR_OR_NULL(info->fwnode))
787 fwnode_remove_software_node(info->fwnode);
788 }
789 kfree(i2c_peripherals);
790 return error;
791}
792
793static int __init
794chromeos_laptop_prepare_acpi_peripherals(struct chromeos_laptop *cros_laptop,
795 const struct chromeos_laptop *src)
796{
797 struct acpi_peripheral *acpi_peripherals;
798 struct acpi_peripheral *acpi_dev;
799 const struct acpi_peripheral *src_dev;
800 int n_peripherals = 0;
801 int i;
802 int error;
803
804 for (i = 0; i < src->num_acpi_peripherals; i++) {
805 if (acpi_dev_present(src->acpi_peripherals[i].hid, NULL, -1))
806 n_peripherals++;
807 }
808
809 if (!n_peripherals)
810 return 0;
811
812 acpi_peripherals = kcalloc(n_peripherals,
813 sizeof(*src->acpi_peripherals),
814 GFP_KERNEL);
815 if (!acpi_peripherals)
816 return -ENOMEM;
817
818 acpi_dev = acpi_peripherals;
819 for (i = 0; i < src->num_acpi_peripherals; i++) {
820 src_dev = &src->acpi_peripherals[i];
821 if (!acpi_dev_present(src_dev->hid, NULL, -1))
822 continue;
823
824 *acpi_dev = *src_dev;
825
826 /* We need to deep-copy properties */
827 if (src_dev->swnode.properties) {
828 acpi_dev->swnode.properties =
829 property_entries_dup(src_dev->swnode.properties);
830 if (IS_ERR(acpi_dev->swnode.properties)) {
831 error = PTR_ERR(acpi_dev->swnode.properties);
832 goto err_out;
833 }
834 }
835
836 acpi_dev++;
837 }
838
839 cros_laptop->acpi_peripherals = acpi_peripherals;
840 cros_laptop->num_acpi_peripherals = n_peripherals;
841
842 return 0;
843
844err_out:
845 while (--i >= 0) {
846 acpi_dev = &acpi_peripherals[i];
847 if (!IS_ERR_OR_NULL(acpi_dev->swnode.properties))
848 property_entries_free(acpi_dev->swnode.properties);
849 }
850
851 kfree(acpi_peripherals);
852 return error;
853}
854
855static void chromeos_laptop_destroy(const struct chromeos_laptop *cros_laptop)
856{
857 const struct acpi_peripheral *acpi_dev;
858 struct i2c_peripheral *i2c_dev;
859 int i;
860
861 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
862 i2c_dev = &cros_laptop->i2c_peripherals[i];
863 i2c_unregister_device(i2c_dev->client);
864 }
865
866 for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
867 acpi_dev = &cros_laptop->acpi_peripherals[i];
868
869 if (acpi_dev->client)
870 device_remove_software_node(&acpi_dev->client->dev);
871
872 property_entries_free(acpi_dev->swnode.properties);
873 }
874
875 kfree(cros_laptop->i2c_peripherals);
876 kfree(cros_laptop->acpi_peripherals);
877 kfree(cros_laptop);
878}
879
880static struct chromeos_laptop * __init
881chromeos_laptop_prepare(const struct chromeos_laptop *src)
882{
883 struct chromeos_laptop *cros_laptop;
884 int error;
885
886 cros_laptop = kzalloc(sizeof(*cros_laptop), GFP_KERNEL);
887 if (!cros_laptop)
888 return ERR_PTR(-ENOMEM);
889
890 error = chromeos_laptop_prepare_i2c_peripherals(cros_laptop, src);
891 if (!error)
892 error = chromeos_laptop_prepare_acpi_peripherals(cros_laptop,
893 src);
894
895 if (error) {
896 chromeos_laptop_destroy(cros_laptop);
897 return ERR_PTR(error);
898 }
899
900 return cros_laptop;
901}
902
903static int __init chromeos_laptop_init(void)
904{
905 const struct dmi_system_id *dmi_id;
906 int error;
907
908 dmi_id = dmi_first_match(chromeos_laptop_dmi_table);
909 if (!dmi_id) {
910 pr_debug("unsupported system\n");
911 return -ENODEV;
912 }
913
914 pr_debug("DMI Matched %s\n", dmi_id->ident);
915
916 cros_laptop = chromeos_laptop_prepare((void *)dmi_id->driver_data);
917 if (IS_ERR(cros_laptop))
918 return PTR_ERR(cros_laptop);
919
920 if (!cros_laptop->num_i2c_peripherals &&
921 !cros_laptop->num_acpi_peripherals) {
922 pr_debug("no relevant devices detected\n");
923 error = -ENODEV;
924 goto err_destroy_cros_laptop;
925 }
926
927 error = bus_register_notifier(&i2c_bus_type,
928 &chromeos_laptop_i2c_notifier);
929 if (error) {
930 pr_err("failed to register i2c bus notifier: %d\n",
931 error);
932 goto err_destroy_cros_laptop;
933 }
934
935 /*
936 * Scan adapters that have been registered and clients that have
937 * been created before we installed the notifier to make sure
938 * we do not miss any devices.
939 */
940 i2c_for_each_dev(NULL, chromeos_laptop_scan_peripherals);
941
942 return 0;
943
944err_destroy_cros_laptop:
945 chromeos_laptop_destroy(cros_laptop);
946 return error;
947}
948
949static void __exit chromeos_laptop_exit(void)
950{
951 bus_unregister_notifier(&i2c_bus_type, &chromeos_laptop_i2c_notifier);
952 chromeos_laptop_destroy(cros_laptop);
953}
954
955module_init(chromeos_laptop_init);
956module_exit(chromeos_laptop_exit);
957
958MODULE_DESCRIPTION("Chrome OS Laptop driver");
959MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
960MODULE_LICENSE("GPL");