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 
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 	"Synopsys DesignWare I2C adapter",
51 	"Synopsys DesignWare I2C adapter",
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 	.suspend_mode		= MXT_SUSPEND_T9_CTRL,
115 };
116 
117 static 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 
123 static struct mxt_platform_data atmel_1664s_platform_data = {
124 	.irqflags		= IRQF_TRIGGER_FALLING,
125 	.suspend_mode		= MXT_SUSPEND_T9_CTRL,
126 };
127 
128 static 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 
134 static 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 
208 struct i2c_lookup {
209 	const char *name;
210 	int instance;
211 	int n;
212 };
213 
214 static 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 
229 static 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  */
259 static 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  */
276 static 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 
286 static 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 
296 static 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 
309 static 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 
322 static 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 
332 static 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 
342 static 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 
352 static 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 
361 static 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 
410 static 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 
419 static struct chromeos_laptop samsung_series_5 = {
420 	.i2c_peripherals = {
421 		/* Light Sensor. */
422 		{ .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
423 	},
424 };
425 
426 static 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 
437 static struct chromeos_laptop hp_chromebook_14 = {
438 	.i2c_peripherals = {
439 		/* Touchpad. */
440 		{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
441 	},
442 };
443 
444 static struct chromeos_laptop dell_chromebook_11 = {
445 	.i2c_peripherals = {
446 		/* Touchpad. */
447 		{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
448 	},
449 };
450 
451 static struct chromeos_laptop toshiba_cb35 = {
452 	.i2c_peripherals = {
453 		/* Touchpad. */
454 		{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
455 	},
456 };
457 
458 static struct chromeos_laptop acer_c7_chromebook = {
459 	.i2c_peripherals = {
460 		/* Touchpad. */
461 		{ .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
462 	},
463 };
464 
465 static struct chromeos_laptop acer_ac700 = {
466 	.i2c_peripherals = {
467 		/* Light Sensor. */
468 		{ .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
469 	},
470 };
471 
472 static 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 
483 static struct chromeos_laptop hp_pavilion_14_chromebook = {
484 	.i2c_peripherals = {
485 		/* Touchpad. */
486 		{ .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
487 	},
488 };
489 
490 static 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 
501 static 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 };
586 MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
587 
588 static struct platform_device *cros_platform_device;
589 
590 static struct platform_driver cros_platform_driver = {
591 	.driver = {
592 		.name = "chromeos_laptop",
593 	},
594 	.probe = chromeos_laptop_probe,
595 };
596 
597 static 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 
622 fail_platform_device2:
623 	platform_device_put(cros_platform_device);
624 fail_platform_device1:
625 	platform_driver_unregister(&cros_platform_driver);
626 	return ret;
627 }
628 
629 static 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 
642 module_init(chromeos_laptop_init);
643 module_exit(chromeos_laptop_exit);
644 
645 MODULE_DESCRIPTION("Chrome OS Laptop driver");
646 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
647 MODULE_LICENSE("GPL");
648