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gro: Allow tunnel stacking in the case of FOU/GUE
[linux/fpc-iii.git] / drivers / platform / chrome / chromeos_laptop.c
bloba04019ab9feb3636dd74d3cf7e1a09764513a5fd
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
40 #define MAX_I2C_DEVICE_DEFERRALS 5
41
42 static struct i2c_client *als;
43 static struct i2c_client *tp;
44 static struct i2c_client *ts;
45
46 static const char *i2c_adapter_names[] = {
47 "SMBus I801 adapter",
48 "i915 gmbus vga",
49 "i915 gmbus panel",
50 "i2c-designware-pci",
51 "i2c-designware-pci",
52 };
53
54 /* Keep this enum consistent with i2c_adapter_names */
55 enum 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
63 enum i2c_peripheral_state {
64 UNPROBED = 0,
65 PROBED,
66 TIMEDOUT,
67 };
68
69 struct 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
78 struct chromeos_laptop {
79 struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
80 };
81
82 static struct chromeos_laptop *cros_laptop;
83
84 static struct i2c_board_info cyapa_device = {
85 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
86 .flags = I2C_CLIENT_WAKE,
87 };
88
89 static struct i2c_board_info isl_als_device = {
90 I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
91 };
92
93 static struct i2c_board_info tsl2583_als_device = {
94 I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
95 };
96
97 static struct i2c_board_info tsl2563_als_device = {
98 I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
99 };
100
101 static int mxt_t19_keys[] = {
102 KEY_RESERVED,
103 KEY_RESERVED,
104 KEY_RESERVED,
105 KEY_RESERVED,
106 KEY_RESERVED,
107 BTN_LEFT
108 };
109
110 static 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 };
115
116 static struct i2c_board_info atmel_224s_tp_device = {
117 I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
118 .platform_data = &atmel_224s_tp_platform_data,
119 .flags = I2C_CLIENT_WAKE,
120 };
121
122 static struct mxt_platform_data atmel_1664s_platform_data = {
123 .irqflags = IRQF_TRIGGER_FALLING,
124 };
125
126 static struct i2c_board_info atmel_1664s_device = {
127 I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
128 .platform_data = &atmel_1664s_platform_data,
129 .flags = I2C_CLIENT_WAKE,
130 };
131
132 static struct i2c_client *__add_probed_i2c_device(
133 const char *name,
134 int bus,
135 struct i2c_board_info *info,
136 const unsigned short *alt_addr_list)
137 {
138 const struct dmi_device *dmi_dev;
139 const struct dmi_dev_onboard *dev_data;
140 struct i2c_adapter *adapter;
141 struct i2c_client *client = NULL;
142 const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
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 /*
174 * Add the i2c device. If we can't detect it at the primary
175 * address we scan secondary addresses. In any case the client
176 * structure gets assigned primary address.
177 */
178 client = i2c_new_probed_device(adapter, info, addr_list, NULL);
179 if (!client && alt_addr_list) {
180 struct i2c_board_info dummy_info = {
181 I2C_BOARD_INFO("dummy", info->addr),
182 };
183 struct i2c_client *dummy;
184
185 dummy = i2c_new_probed_device(adapter, &dummy_info,
186 alt_addr_list, NULL);
187 if (dummy) {
188 pr_debug("%s %d-%02x is probed at %02x\n",
189 __func__, bus, info->addr, dummy->addr);
190 i2c_unregister_device(dummy);
191 client = i2c_new_device(adapter, info);
192 }
193 }
194
195 if (!client)
196 pr_notice("%s failed to register device %d-%02x\n",
197 __func__, bus, info->addr);
198 else
199 pr_debug("%s added i2c device %d-%02x\n",
200 __func__, bus, info->addr);
201
202 i2c_put_adapter(adapter);
203 return client;
204 }
205
206 struct i2c_lookup {
207 const char *name;
208 int instance;
209 int n;
210 };
211
212 static int __find_i2c_adap(struct device *dev, void *data)
213 {
214 struct i2c_lookup *lookup = data;
215 static const char *prefix = "i2c-";
216 struct i2c_adapter *adapter;
217
218 if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
219 return 0;
220 adapter = to_i2c_adapter(dev);
221 if (strncmp(adapter->name, lookup->name, strlen(lookup->name)) == 0 &&
222 lookup->n++ == lookup->instance)
223 return 1;
224 return 0;
225 }
226
227 static int find_i2c_adapter_num(enum i2c_adapter_type type)
228 {
229 struct device *dev = NULL;
230 struct i2c_adapter *adapter;
231 struct i2c_lookup lookup;
232
233 memset(&lookup, 0, sizeof(lookup));
234 lookup.name = i2c_adapter_names[type];
235 lookup.instance = (type == I2C_ADAPTER_DESIGNWARE_1) ? 1 : 0;
236
237 /* find the adapter by name */
238 dev = bus_find_device(&i2c_bus_type, NULL, &lookup, __find_i2c_adap);
239 if (!dev) {
240 /* Adapters may appear later. Deferred probing will retry */
241 pr_notice("%s: i2c adapter %s not found on system.\n", __func__,
242 lookup.name);
243 return -ENODEV;
244 }
245 adapter = to_i2c_adapter(dev);
246 return adapter->nr;
247 }
248
249 /*
250 * Takes a list of addresses in addrs as such :
251 * { addr1, ... , addrn, I2C_CLIENT_END };
252 * add_probed_i2c_device will use i2c_new_probed_device
253 * and probe for devices at all of the addresses listed.
254 * Returns NULL if no devices found.
255 * See Documentation/i2c/instantiating-devices for more information.
256 */
257 static struct i2c_client *add_probed_i2c_device(
258 const char *name,
259 enum i2c_adapter_type type,
260 struct i2c_board_info *info,
261 const unsigned short *addrs)
262 {
263 return __add_probed_i2c_device(name,
264 find_i2c_adapter_num(type),
265 info,
266 addrs);
267 }
268
269 /*
270 * Probes for a device at a single address, the one provided by
271 * info->addr.
272 * Returns NULL if no device found.
273 */
274 static struct i2c_client *add_i2c_device(const char *name,
275 enum i2c_adapter_type type,
276 struct i2c_board_info *info)
277 {
278 return __add_probed_i2c_device(name,
279 find_i2c_adapter_num(type),
280 info,
281 NULL);
282 }
283
284 static int setup_cyapa_tp(enum i2c_adapter_type type)
285 {
286 if (tp)
287 return 0;
288
289 /* add cyapa touchpad */
290 tp = add_i2c_device("trackpad", type, &cyapa_device);
291 return (!tp) ? -EAGAIN : 0;
292 }
293
294 static int setup_atmel_224s_tp(enum i2c_adapter_type type)
295 {
296 const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
297 I2C_CLIENT_END };
298 if (tp)
299 return 0;
300
301 /* add atmel mxt touchpad */
302 tp = add_probed_i2c_device("trackpad", type,
303 &atmel_224s_tp_device, addr_list);
304 return (!tp) ? -EAGAIN : 0;
305 }
306
307 static int setup_atmel_1664s_ts(enum i2c_adapter_type type)
308 {
309 const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
310 I2C_CLIENT_END };
311 if (ts)
312 return 0;
313
314 /* add atmel mxt touch device */
315 ts = add_probed_i2c_device("touchscreen", type,
316 &atmel_1664s_device, addr_list);
317 return (!ts) ? -EAGAIN : 0;
318 }
319
320 static int setup_isl29018_als(enum i2c_adapter_type type)
321 {
322 if (als)
323 return 0;
324
325 /* add isl29018 light sensor */
326 als = add_i2c_device("lightsensor", type, &isl_als_device);
327 return (!als) ? -EAGAIN : 0;
328 }
329
330 static int setup_tsl2583_als(enum i2c_adapter_type type)
331 {
332 if (als)
333 return 0;
334
335 /* add tsl2583 light sensor */
336 als = add_i2c_device(NULL, type, &tsl2583_als_device);
337 return (!als) ? -EAGAIN : 0;
338 }
339
340 static int setup_tsl2563_als(enum i2c_adapter_type type)
341 {
342 if (als)
343 return 0;
344
345 /* add tsl2563 light sensor */
346 als = add_i2c_device(NULL, type, &tsl2563_als_device);
347 return (!als) ? -EAGAIN : 0;
348 }
349
350 static int __init chromeos_laptop_dmi_matched(const struct dmi_system_id *id)
351 {
352 cros_laptop = (void *)id->driver_data;
353 pr_debug("DMI Matched %s.\n", id->ident);
354
355 /* Indicate to dmi_scan that processing is done. */
356 return 1;
357 }
358
359 static int chromeos_laptop_probe(struct platform_device *pdev)
360 {
361 int i;
362 int ret = 0;
363
364 for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
365 struct i2c_peripheral *i2c_dev;
366
367 i2c_dev = &cros_laptop->i2c_peripherals[i];
368
369 /* No more peripherals. */
370 if (i2c_dev->add == NULL)
371 break;
372
373 if (i2c_dev->state == TIMEDOUT || i2c_dev->state == PROBED)
374 continue;
375
376 /*
377 * Check that the i2c adapter is present.
378 * -EPROBE_DEFER if missing as the adapter may appear much
379 * later.
380 */
381 if (find_i2c_adapter_num(i2c_dev->type) == -ENODEV) {
382 ret = -EPROBE_DEFER;
383 continue;
384 }
385
386 /* Add the device. */
387 if (i2c_dev->add(i2c_dev->type) == -EAGAIN) {
388 /*
389 * Set -EPROBE_DEFER a limited num of times
390 * if device is not successfully added.
391 */
392 if (++i2c_dev->tries < MAX_I2C_DEVICE_DEFERRALS) {
393 ret = -EPROBE_DEFER;
394 } else {
395 /* Ran out of tries. */
396 pr_notice("%s: Ran out of tries for device.\n",
397 __func__);
398 i2c_dev->state = TIMEDOUT;
399 }
400 } else {
401 i2c_dev->state = PROBED;
402 }
403 }
404
405 return ret;
406 }
407
408 static struct chromeos_laptop samsung_series_5_550 = {
409 .i2c_peripherals = {
410 /* Touchpad. */
411 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
412 /* Light Sensor. */
413 { .add = setup_isl29018_als, I2C_ADAPTER_SMBUS },
414 },
415 };
416
417 static struct chromeos_laptop samsung_series_5 = {
418 .i2c_peripherals = {
419 /* Light Sensor. */
420 { .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
421 },
422 };
423
424 static struct chromeos_laptop chromebook_pixel = {
425 .i2c_peripherals = {
426 /* Touch Screen. */
427 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_PANEL },
428 /* Touchpad. */
429 { .add = setup_atmel_224s_tp, I2C_ADAPTER_VGADDC },
430 /* Light Sensor. */
431 { .add = setup_isl29018_als, I2C_ADAPTER_PANEL },
432 },
433 };
434
435 static struct chromeos_laptop hp_chromebook_14 = {
436 .i2c_peripherals = {
437 /* Touchpad. */
438 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
439 },
440 };
441
442 static struct chromeos_laptop dell_chromebook_11 = {
443 .i2c_peripherals = {
444 /* Touchpad. */
445 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
446 },
447 };
448
449 static struct chromeos_laptop toshiba_cb35 = {
450 .i2c_peripherals = {
451 /* Touchpad. */
452 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
453 },
454 };
455
456 static struct chromeos_laptop acer_c7_chromebook = {
457 .i2c_peripherals = {
458 /* Touchpad. */
459 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
460 },
461 };
462
463 static struct chromeos_laptop acer_ac700 = {
464 .i2c_peripherals = {
465 /* Light Sensor. */
466 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
467 },
468 };
469
470 static struct chromeos_laptop acer_c720 = {
471 .i2c_peripherals = {
472 /* Touchscreen. */
473 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_DESIGNWARE_1 },
474 /* Touchpad. */
475 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
476 /* Light Sensor. */
477 { .add = setup_isl29018_als, I2C_ADAPTER_DESIGNWARE_1 },
478 },
479 };
480
481 static struct chromeos_laptop hp_pavilion_14_chromebook = {
482 .i2c_peripherals = {
483 /* Touchpad. */
484 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
485 },
486 };
487
488 static struct chromeos_laptop cr48 = {
489 .i2c_peripherals = {
490 /* Light Sensor. */
491 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
492 },
493 };
494
495 #define _CBDD(board_) \
496 .callback = chromeos_laptop_dmi_matched, \
497 .driver_data = (void *)&board_
498
499 static struct dmi_system_id chromeos_laptop_dmi_table[] __initdata = {
500 {
501 .ident = "Samsung Series 5 550",
502 .matches = {
503 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
504 DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
505 },
506 _CBDD(samsung_series_5_550),
507 },
508 {
509 .ident = "Samsung Series 5",
510 .matches = {
511 DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
512 },
513 _CBDD(samsung_series_5),
514 },
515 {
516 .ident = "Chromebook Pixel",
517 .matches = {
518 DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
519 DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
520 },
521 _CBDD(chromebook_pixel),
522 },
523 {
524 .ident = "Wolf",
525 .matches = {
526 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
527 DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
528 },
529 _CBDD(dell_chromebook_11),
530 },
531 {
532 .ident = "HP Chromebook 14",
533 .matches = {
534 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
535 DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
536 },
537 _CBDD(hp_chromebook_14),
538 },
539 {
540 .ident = "Toshiba CB35",
541 .matches = {
542 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
543 DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
544 },
545 _CBDD(toshiba_cb35),
546 },
547 {
548 .ident = "Acer C7 Chromebook",
549 .matches = {
550 DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
551 },
552 _CBDD(acer_c7_chromebook),
553 },
554 {
555 .ident = "Acer AC700",
556 .matches = {
557 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
558 },
559 _CBDD(acer_ac700),
560 },
561 {
562 .ident = "Acer C720",
563 .matches = {
564 DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
565 },
566 _CBDD(acer_c720),
567 },
568 {
569 .ident = "HP Pavilion 14 Chromebook",
570 .matches = {
571 DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
572 },
573 _CBDD(hp_pavilion_14_chromebook),
574 },
575 {
576 .ident = "Cr-48",
577 .matches = {
578 DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
579 },
580 _CBDD(cr48),
581 },
582 { }
583 };
584 MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
585
586 static struct platform_device *cros_platform_device;
587
588 static struct platform_driver cros_platform_driver = {
589 .driver = {
590 .name = "chromeos_laptop",
591 },
592 .probe = chromeos_laptop_probe,
593 };
594
595 static int __init chromeos_laptop_init(void)
596 {
597 int ret;
598
599 if (!dmi_check_system(chromeos_laptop_dmi_table)) {
600 pr_debug("%s unsupported system.\n", __func__);
601 return -ENODEV;
602 }
603
604 ret = platform_driver_register(&cros_platform_driver);
605 if (ret)
606 return ret;
607
608 cros_platform_device = platform_device_alloc("chromeos_laptop", -1);
609 if (!cros_platform_device) {
610 ret = -ENOMEM;
611 goto fail_platform_device1;
612 }
613
614 ret = platform_device_add(cros_platform_device);
615 if (ret)
616 goto fail_platform_device2;
617
618 return 0;
619
620 fail_platform_device2:
621 platform_device_put(cros_platform_device);
622 fail_platform_device1:
623 platform_driver_unregister(&cros_platform_driver);
624 return ret;
625 }
626
627 static void __exit chromeos_laptop_exit(void)
628 {
629 if (als)
630 i2c_unregister_device(als);
631 if (tp)
632 i2c_unregister_device(tp);
633 if (ts)
634 i2c_unregister_device(ts);
635
636 platform_device_unregister(cros_platform_device);
637 platform_driver_unregister(&cros_platform_driver);
638 }
639
640 module_init(chromeos_laptop_init);
641 module_exit(chromeos_laptop_exit);
642
643 MODULE_DESCRIPTION("Chrome OS Laptop driver");
644 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
645 MODULE_LICENSE("GPL");
Linux with added FPC-III support