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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/*
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 ELAN_TP_I2C_ADDR 0x15
38#define ISL_ALS_I2C_ADDR 0x44
39#define TAOS_ALS_I2C_ADDR 0x29
40
41#define MAX_I2C_DEVICE_DEFERRALS 5
42
43static struct i2c_client *als;
44static struct i2c_client *tp;
45static struct i2c_client *ts;
46
47static const char *i2c_adapter_names[] = {
48 "SMBus I801 adapter",
49 "i915 gmbus vga",
50 "i915 gmbus panel",
51 "Synopsys DesignWare I2C adapter",
52 "Synopsys DesignWare I2C adapter",
53};
54
55/* Keep this enum consistent with i2c_adapter_names */
56enum i2c_adapter_type {
57 I2C_ADAPTER_SMBUS = 0,
58 I2C_ADAPTER_VGADDC,
59 I2C_ADAPTER_PANEL,
60 I2C_ADAPTER_DESIGNWARE_0,
61 I2C_ADAPTER_DESIGNWARE_1,
62};
63
64enum i2c_peripheral_state {
65 UNPROBED = 0,
66 PROBED,
67 TIMEDOUT,
68};
69
70struct i2c_peripheral {
71 int (*add)(enum i2c_adapter_type type);
72 enum i2c_adapter_type type;
73 enum i2c_peripheral_state state;
74 int tries;
75};
76
77#define MAX_I2C_PERIPHERALS 4
78
79struct chromeos_laptop {
80 struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
81};
82
83static struct chromeos_laptop *cros_laptop;
84
85static struct i2c_board_info cyapa_device = {
86 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
87 .flags = I2C_CLIENT_WAKE,
88};
89
90static struct i2c_board_info elantech_device = {
91 I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
92 .flags = I2C_CLIENT_WAKE,
93};
94
95static struct i2c_board_info isl_als_device = {
96 I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
97};
98
99static struct i2c_board_info tsl2583_als_device = {
100 I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
101};
102
103static struct i2c_board_info tsl2563_als_device = {
104 I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
105};
106
107static int mxt_t19_keys[] = {
108 KEY_RESERVED,
109 KEY_RESERVED,
110 KEY_RESERVED,
111 KEY_RESERVED,
112 KEY_RESERVED,
113 BTN_LEFT
114};
115
116static struct mxt_platform_data atmel_224s_tp_platform_data = {
117 .irqflags = IRQF_TRIGGER_FALLING,
118 .t19_num_keys = ARRAY_SIZE(mxt_t19_keys),
119 .t19_keymap = mxt_t19_keys,
120 .suspend_mode = MXT_SUSPEND_T9_CTRL,
121};
122
123static struct i2c_board_info atmel_224s_tp_device = {
124 I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
125 .platform_data = &atmel_224s_tp_platform_data,
126 .flags = I2C_CLIENT_WAKE,
127};
128
129static struct mxt_platform_data atmel_1664s_platform_data = {
130 .irqflags = IRQF_TRIGGER_FALLING,
131 .suspend_mode = MXT_SUSPEND_T9_CTRL,
132};
133
134static struct i2c_board_info atmel_1664s_device = {
135 I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
136 .platform_data = &atmel_1664s_platform_data,
137 .flags = I2C_CLIENT_WAKE,
138};
139
140static struct i2c_client *__add_probed_i2c_device(
141 const char *name,
142 int bus,
143 struct i2c_board_info *info,
144 const unsigned short *alt_addr_list)
145{
146 const struct dmi_device *dmi_dev;
147 const struct dmi_dev_onboard *dev_data;
148 struct i2c_adapter *adapter;
149 struct i2c_client *client = NULL;
150 const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
151
152 if (bus < 0)
153 return NULL;
154 /*
155 * If a name is specified, look for irq platform information stashed
156 * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
157 */
158 if (name) {
159 dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
160 if (!dmi_dev) {
161 pr_err("%s failed to dmi find device %s.\n",
162 __func__,
163 name);
164 return NULL;
165 }
166 dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
167 if (!dev_data) {
168 pr_err("%s failed to get data from dmi for %s.\n",
169 __func__, name);
170 return NULL;
171 }
172 info->irq = dev_data->instance;
173 }
174
175 adapter = i2c_get_adapter(bus);
176 if (!adapter) {
177 pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
178 return NULL;
179 }
180
181 /*
182 * Add the i2c device. If we can't detect it at the primary
183 * address we scan secondary addresses. In any case the client
184 * structure gets assigned primary address.
185 */
186 client = i2c_new_probed_device(adapter, info, addr_list, NULL);
187 if (!client && alt_addr_list) {
188 struct i2c_board_info dummy_info = {
189 I2C_BOARD_INFO("dummy", info->addr),
190 };
191 struct i2c_client *dummy;
192
193 dummy = i2c_new_probed_device(adapter, &dummy_info,
194 alt_addr_list, NULL);
195 if (dummy) {
196 pr_debug("%s %d-%02x is probed at %02x\n",
197 __func__, bus, info->addr, dummy->addr);
198 i2c_unregister_device(dummy);
199 client = i2c_new_device(adapter, info);
200 }
201 }
202
203 if (!client)
204 pr_notice("%s failed to register device %d-%02x\n",
205 __func__, bus, info->addr);
206 else
207 pr_debug("%s added i2c device %d-%02x\n",
208 __func__, bus, info->addr);
209
210 i2c_put_adapter(adapter);
211 return client;
212}
213
214struct i2c_lookup {
215 const char *name;
216 int instance;
217 int n;
218};
219
220static int __find_i2c_adap(struct device *dev, void *data)
221{
222 struct i2c_lookup *lookup = data;
223 static const char *prefix = "i2c-";
224 struct i2c_adapter *adapter;
225
226 if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
227 return 0;
228 adapter = to_i2c_adapter(dev);
229 if (strncmp(adapter->name, lookup->name, strlen(lookup->name)) == 0 &&
230 lookup->n++ == lookup->instance)
231 return 1;
232 return 0;
233}
234
235static int find_i2c_adapter_num(enum i2c_adapter_type type)
236{
237 struct device *dev = NULL;
238 struct i2c_adapter *adapter;
239 struct i2c_lookup lookup;
240
241 memset(&lookup, 0, sizeof(lookup));
242 lookup.name = i2c_adapter_names[type];
243 lookup.instance = (type == I2C_ADAPTER_DESIGNWARE_1) ? 1 : 0;
244
245 /* find the adapter by name */
246 dev = bus_find_device(&i2c_bus_type, NULL, &lookup, __find_i2c_adap);
247 if (!dev) {
248 /* Adapters may appear later. Deferred probing will retry */
249 pr_notice("%s: i2c adapter %s not found on system.\n", __func__,
250 lookup.name);
251 return -ENODEV;
252 }
253 adapter = to_i2c_adapter(dev);
254 return adapter->nr;
255}
256
257/*
258 * Takes a list of addresses in addrs as such :
259 * { addr1, ... , addrn, I2C_CLIENT_END };
260 * add_probed_i2c_device will use i2c_new_probed_device
261 * and probe for devices at all of the addresses listed.
262 * Returns NULL if no devices found.
263 * See Documentation/i2c/instantiating-devices for more information.
264 */
265static struct i2c_client *add_probed_i2c_device(
266 const char *name,
267 enum i2c_adapter_type type,
268 struct i2c_board_info *info,
269 const unsigned short *addrs)
270{
271 return __add_probed_i2c_device(name,
272 find_i2c_adapter_num(type),
273 info,
274 addrs);
275}
276
277/*
278 * Probes for a device at a single address, the one provided by
279 * info->addr.
280 * Returns NULL if no device found.
281 */
282static struct i2c_client *add_i2c_device(const char *name,
283 enum i2c_adapter_type type,
284 struct i2c_board_info *info)
285{
286 return __add_probed_i2c_device(name,
287 find_i2c_adapter_num(type),
288 info,
289 NULL);
290}
291
292static int setup_cyapa_tp(enum i2c_adapter_type type)
293{
294 if (tp)
295 return 0;
296
297 /* add cyapa touchpad */
298 tp = add_i2c_device("trackpad", type, &cyapa_device);
299 return (!tp) ? -EAGAIN : 0;
300}
301
302static int setup_atmel_224s_tp(enum i2c_adapter_type type)
303{
304 const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
305 I2C_CLIENT_END };
306 if (tp)
307 return 0;
308
309 /* add atmel mxt touchpad */
310 tp = add_probed_i2c_device("trackpad", type,
311 &atmel_224s_tp_device, addr_list);
312 return (!tp) ? -EAGAIN : 0;
313}
314
315static int setup_elantech_tp(enum i2c_adapter_type type)
316{
317 if (tp)
318 return 0;
319
320 /* add elantech touchpad */
321 tp = add_i2c_device("trackpad", type, &elantech_device);
322 return (!tp) ? -EAGAIN : 0;
323}
324
325static int setup_atmel_1664s_ts(enum i2c_adapter_type type)
326{
327 const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
328 I2C_CLIENT_END };
329 if (ts)
330 return 0;
331
332 /* add atmel mxt touch device */
333 ts = add_probed_i2c_device("touchscreen", type,
334 &atmel_1664s_device, addr_list);
335 return (!ts) ? -EAGAIN : 0;
336}
337
338static int setup_isl29018_als(enum i2c_adapter_type type)
339{
340 if (als)
341 return 0;
342
343 /* add isl29018 light sensor */
344 als = add_i2c_device("lightsensor", type, &isl_als_device);
345 return (!als) ? -EAGAIN : 0;
346}
347
348static int setup_tsl2583_als(enum i2c_adapter_type type)
349{
350 if (als)
351 return 0;
352
353 /* add tsl2583 light sensor */
354 als = add_i2c_device(NULL, type, &tsl2583_als_device);
355 return (!als) ? -EAGAIN : 0;
356}
357
358static int setup_tsl2563_als(enum i2c_adapter_type type)
359{
360 if (als)
361 return 0;
362
363 /* add tsl2563 light sensor */
364 als = add_i2c_device(NULL, type, &tsl2563_als_device);
365 return (!als) ? -EAGAIN : 0;
366}
367
368static int __init chromeos_laptop_dmi_matched(const struct dmi_system_id *id)
369{
370 cros_laptop = (void *)id->driver_data;
371 pr_debug("DMI Matched %s.\n", id->ident);
372
373 /* Indicate to dmi_scan that processing is done. */
374 return 1;
375}
376
377static int chromeos_laptop_probe(struct platform_device *pdev)
378{
379 int i;
380 int ret = 0;
381
382 for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
383 struct i2c_peripheral *i2c_dev;
384
385 i2c_dev = &cros_laptop->i2c_peripherals[i];
386
387 /* No more peripherals. */
388 if (i2c_dev->add == NULL)
389 break;
390
391 if (i2c_dev->state == TIMEDOUT || i2c_dev->state == PROBED)
392 continue;
393
394 /*
395 * Check that the i2c adapter is present.
396 * -EPROBE_DEFER if missing as the adapter may appear much
397 * later.
398 */
399 if (find_i2c_adapter_num(i2c_dev->type) == -ENODEV) {
400 ret = -EPROBE_DEFER;
401 continue;
402 }
403
404 /* Add the device. */
405 if (i2c_dev->add(i2c_dev->type) == -EAGAIN) {
406 /*
407 * Set -EPROBE_DEFER a limited num of times
408 * if device is not successfully added.
409 */
410 if (++i2c_dev->tries < MAX_I2C_DEVICE_DEFERRALS) {
411 ret = -EPROBE_DEFER;
412 } else {
413 /* Ran out of tries. */
414 pr_notice("%s: Ran out of tries for device.\n",
415 __func__);
416 i2c_dev->state = TIMEDOUT;
417 }
418 } else {
419 i2c_dev->state = PROBED;
420 }
421 }
422
423 return ret;
424}
425
426static struct chromeos_laptop samsung_series_5_550 = {
427 .i2c_peripherals = {
428 /* Touchpad. */
429 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
430 /* Light Sensor. */
431 { .add = setup_isl29018_als, I2C_ADAPTER_SMBUS },
432 },
433};
434
435static struct chromeos_laptop samsung_series_5 = {
436 .i2c_peripherals = {
437 /* Light Sensor. */
438 { .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
439 },
440};
441
442static struct chromeos_laptop chromebook_pixel = {
443 .i2c_peripherals = {
444 /* Touch Screen. */
445 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_PANEL },
446 /* Touchpad. */
447 { .add = setup_atmel_224s_tp, I2C_ADAPTER_VGADDC },
448 /* Light Sensor. */
449 { .add = setup_isl29018_als, I2C_ADAPTER_PANEL },
450 },
451};
452
453static struct chromeos_laptop hp_chromebook_14 = {
454 .i2c_peripherals = {
455 /* Touchpad. */
456 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
457 },
458};
459
460static struct chromeos_laptop dell_chromebook_11 = {
461 .i2c_peripherals = {
462 /* Touchpad. */
463 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
464 /* Elan Touchpad option. */
465 { .add = setup_elantech_tp, I2C_ADAPTER_DESIGNWARE_0 },
466 },
467};
468
469static struct chromeos_laptop toshiba_cb35 = {
470 .i2c_peripherals = {
471 /* Touchpad. */
472 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
473 },
474};
475
476static struct chromeos_laptop acer_c7_chromebook = {
477 .i2c_peripherals = {
478 /* Touchpad. */
479 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
480 },
481};
482
483static struct chromeos_laptop acer_ac700 = {
484 .i2c_peripherals = {
485 /* Light Sensor. */
486 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
487 },
488};
489
490static struct chromeos_laptop acer_c720 = {
491 .i2c_peripherals = {
492 /* Touchscreen. */
493 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_DESIGNWARE_1 },
494 /* Touchpad. */
495 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
496 /* Elan Touchpad option. */
497 { .add = setup_elantech_tp, I2C_ADAPTER_DESIGNWARE_0 },
498 /* Light Sensor. */
499 { .add = setup_isl29018_als, I2C_ADAPTER_DESIGNWARE_1 },
500 },
501};
502
503static struct chromeos_laptop hp_pavilion_14_chromebook = {
504 .i2c_peripherals = {
505 /* Touchpad. */
506 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
507 },
508};
509
510static struct chromeos_laptop cr48 = {
511 .i2c_peripherals = {
512 /* Light Sensor. */
513 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
514 },
515};
516
517#define _CBDD(board_) \
518 .callback = chromeos_laptop_dmi_matched, \
519 .driver_data = (void *)&board_
520
521static struct dmi_system_id chromeos_laptop_dmi_table[] __initdata = {
522 {
523 .ident = "Samsung Series 5 550",
524 .matches = {
525 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
526 DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
527 },
528 _CBDD(samsung_series_5_550),
529 },
530 {
531 .ident = "Samsung Series 5",
532 .matches = {
533 DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
534 },
535 _CBDD(samsung_series_5),
536 },
537 {
538 .ident = "Chromebook Pixel",
539 .matches = {
540 DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
541 DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
542 },
543 _CBDD(chromebook_pixel),
544 },
545 {
546 .ident = "Wolf",
547 .matches = {
548 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
549 DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
550 },
551 _CBDD(dell_chromebook_11),
552 },
553 {
554 .ident = "HP Chromebook 14",
555 .matches = {
556 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
557 DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
558 },
559 _CBDD(hp_chromebook_14),
560 },
561 {
562 .ident = "Toshiba CB35",
563 .matches = {
564 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
565 DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
566 },
567 _CBDD(toshiba_cb35),
568 },
569 {
570 .ident = "Acer C7 Chromebook",
571 .matches = {
572 DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
573 },
574 _CBDD(acer_c7_chromebook),
575 },
576 {
577 .ident = "Acer AC700",
578 .matches = {
579 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
580 },
581 _CBDD(acer_ac700),
582 },
583 {
584 .ident = "Acer C720",
585 .matches = {
586 DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
587 },
588 _CBDD(acer_c720),
589 },
590 {
591 .ident = "HP Pavilion 14 Chromebook",
592 .matches = {
593 DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
594 },
595 _CBDD(hp_pavilion_14_chromebook),
596 },
597 {
598 .ident = "Cr-48",
599 .matches = {
600 DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
601 },
602 _CBDD(cr48),
603 },
604 { }
605};
606MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
607
608static struct platform_device *cros_platform_device;
609
610static struct platform_driver cros_platform_driver = {
611 .driver = {
612 .name = "chromeos_laptop",
613 },
614 .probe = chromeos_laptop_probe,
615};
616
617static int __init chromeos_laptop_init(void)
618{
619 int ret;
620
621 if (!dmi_check_system(chromeos_laptop_dmi_table)) {
622 pr_debug("%s unsupported system.\n", __func__);
623 return -ENODEV;
624 }
625
626 ret = platform_driver_register(&cros_platform_driver);
627 if (ret)
628 return ret;
629
630 cros_platform_device = platform_device_alloc("chromeos_laptop", -1);
631 if (!cros_platform_device) {
632 ret = -ENOMEM;
633 goto fail_platform_device1;
634 }
635
636 ret = platform_device_add(cros_platform_device);
637 if (ret)
638 goto fail_platform_device2;
639
640 return 0;
641
642fail_platform_device2:
643 platform_device_put(cros_platform_device);
644fail_platform_device1:
645 platform_driver_unregister(&cros_platform_driver);
646 return ret;
647}
648
649static void __exit chromeos_laptop_exit(void)
650{
651 if (als)
652 i2c_unregister_device(als);
653 if (tp)
654 i2c_unregister_device(tp);
655 if (ts)
656 i2c_unregister_device(ts);
657
658 platform_device_unregister(cros_platform_device);
659 platform_driver_unregister(&cros_platform_driver);
660}
661
662module_init(chromeos_laptop_init);
663module_exit(chromeos_laptop_exit);
664
665MODULE_DESCRIPTION("Chrome OS Laptop driver");
666MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
667MODULE_LICENSE("GPL");