1/*
2 * nvec_power: power supply driver for a NVIDIA compliant embedded controller
3 *
4 * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
5 *
6 * Authors:  Ilya Petrov <ilya.muromec@gmail.com>
7 *           Marc Dietrich <marvin24@gmx.de>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License.  See the file "COPYING" in the main directory of this archive
11 * for more details.
12 *
13 */
14
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/err.h>
18#include <linux/power_supply.h>
19#include <linux/slab.h>
20#include <linux/workqueue.h>
21#include <linux/delay.h>
22
23#include "nvec.h"
24
25#define GET_SYSTEM_STATUS 0x00
26
27struct nvec_power {
28	struct notifier_block notifier;
29	struct delayed_work poller;
30	struct nvec_chip *nvec;
31	int on;
32	int bat_present;
33	int bat_status;
34	int bat_voltage_now;
35	int bat_current_now;
36	int bat_current_avg;
37	int time_remain;
38	int charge_full_design;
39	int charge_last_full;
40	int critical_capacity;
41	int capacity_remain;
42	int bat_temperature;
43	int bat_cap;
44	int bat_type_enum;
45	char bat_manu[30];
46	char bat_model[30];
47	char bat_type[30];
48};
49
50enum {
51	SLOT_STATUS,
52	VOLTAGE,
53	TIME_REMAINING,
54	CURRENT,
55	AVERAGE_CURRENT,
56	AVERAGING_TIME_INTERVAL,
57	CAPACITY_REMAINING,
58	LAST_FULL_CHARGE_CAPACITY,
59	DESIGN_CAPACITY,
60	CRITICAL_CAPACITY,
61	TEMPERATURE,
62	MANUFACTURER,
63	MODEL,
64	TYPE,
65};
66
67enum {
68	AC,
69	BAT,
70};
71
72struct bat_response {
73	u8 event_type;
74	u8 length;
75	u8 sub_type;
76	u8 status;
77	/* payload */
78	union {
79		char plc[30];
80		u16 plu;
81		s16 pls;
82	};
83};
84
85static struct power_supply *nvec_bat_psy;
86static struct power_supply *nvec_psy;
87
88static int nvec_power_notifier(struct notifier_block *nb,
89			       unsigned long event_type, void *data)
90{
91	struct nvec_power *power =
92	    container_of(nb, struct nvec_power, notifier);
93	struct bat_response *res = (struct bat_response *)data;
94
95	if (event_type != NVEC_SYS)
96		return NOTIFY_DONE;
97
98	if (res->sub_type == 0) {
99		if (power->on != res->plu) {
100			power->on = res->plu;
101			power_supply_changed(nvec_psy);
102		}
103		return NOTIFY_STOP;
104	}
105	return NOTIFY_OK;
106}
107
108static const int bat_init[] = {
109	LAST_FULL_CHARGE_CAPACITY, DESIGN_CAPACITY, CRITICAL_CAPACITY,
110	MANUFACTURER, MODEL, TYPE,
111};
112
113static void get_bat_mfg_data(struct nvec_power *power)
114{
115	int i;
116	char buf[] = { NVEC_BAT, SLOT_STATUS };
117
118	for (i = 0; i < ARRAY_SIZE(bat_init); i++) {
119		buf[1] = bat_init[i];
120		nvec_write_async(power->nvec, buf, 2);
121	}
122}
123
124static int nvec_power_bat_notifier(struct notifier_block *nb,
125				   unsigned long event_type, void *data)
126{
127	struct nvec_power *power =
128	    container_of(nb, struct nvec_power, notifier);
129	struct bat_response *res = (struct bat_response *)data;
130	int status_changed = 0;
131
132	if (event_type != NVEC_BAT)
133		return NOTIFY_DONE;
134
135	switch (res->sub_type) {
136	case SLOT_STATUS:
137		if (res->plc[0] & 1) {
138			if (power->bat_present == 0) {
139				status_changed = 1;
140				get_bat_mfg_data(power);
141			}
142
143			power->bat_present = 1;
144
145			switch ((res->plc[0] >> 1) & 3) {
146			case 0:
147				power->bat_status =
148				    POWER_SUPPLY_STATUS_NOT_CHARGING;
149				break;
150			case 1:
151				power->bat_status =
152				    POWER_SUPPLY_STATUS_CHARGING;
153				break;
154			case 2:
155				power->bat_status =
156				    POWER_SUPPLY_STATUS_DISCHARGING;
157				break;
158			default:
159				power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
160			}
161		} else {
162			if (power->bat_present == 1)
163				status_changed = 1;
164
165			power->bat_present = 0;
166			power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
167		}
168		power->bat_cap = res->plc[1];
169		if (status_changed)
170			power_supply_changed(nvec_bat_psy);
171		break;
172	case VOLTAGE:
173		power->bat_voltage_now = res->plu * 1000;
174		break;
175	case TIME_REMAINING:
176		power->time_remain = res->plu * 3600;
177		break;
178	case CURRENT:
179		power->bat_current_now = res->pls * 1000;
180		break;
181	case AVERAGE_CURRENT:
182		power->bat_current_avg = res->pls * 1000;
183		break;
184	case CAPACITY_REMAINING:
185		power->capacity_remain = res->plu * 1000;
186		break;
187	case LAST_FULL_CHARGE_CAPACITY:
188		power->charge_last_full = res->plu * 1000;
189		break;
190	case DESIGN_CAPACITY:
191		power->charge_full_design = res->plu * 1000;
192		break;
193	case CRITICAL_CAPACITY:
194		power->critical_capacity = res->plu * 1000;
195		break;
196	case TEMPERATURE:
197		power->bat_temperature = res->plu - 2732;
198		break;
199	case MANUFACTURER:
200		memcpy(power->bat_manu, &res->plc, res->length - 2);
201		power->bat_model[res->length - 2] = '\0';
202		break;
203	case MODEL:
204		memcpy(power->bat_model, &res->plc, res->length - 2);
205		power->bat_model[res->length - 2] = '\0';
206		break;
207	case TYPE:
208		memcpy(power->bat_type, &res->plc, res->length - 2);
209		power->bat_type[res->length - 2] = '\0';
210		/* this differs a little from the spec
211		   fill in more if you find some */
212		if (!strncmp(power->bat_type, "Li", 30))
213			power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_LION;
214		else
215			power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
216		break;
217	default:
218		return NOTIFY_STOP;
219	}
220
221	return NOTIFY_STOP;
222}
223
224static int nvec_power_get_property(struct power_supply *psy,
225				   enum power_supply_property psp,
226				   union power_supply_propval *val)
227{
228	struct nvec_power *power = dev_get_drvdata(psy->dev.parent);
229
230	switch (psp) {
231	case POWER_SUPPLY_PROP_ONLINE:
232		val->intval = power->on;
233		break;
234	default:
235		return -EINVAL;
236	}
237	return 0;
238}
239
240static int nvec_battery_get_property(struct power_supply *psy,
241				     enum power_supply_property psp,
242				     union power_supply_propval *val)
243{
244	struct nvec_power *power = dev_get_drvdata(psy->dev.parent);
245
246	switch (psp) {
247	case POWER_SUPPLY_PROP_STATUS:
248		val->intval = power->bat_status;
249		break;
250	case POWER_SUPPLY_PROP_CAPACITY:
251		val->intval = power->bat_cap;
252		break;
253	case POWER_SUPPLY_PROP_PRESENT:
254		val->intval = power->bat_present;
255		break;
256	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
257		val->intval = power->bat_voltage_now;
258		break;
259	case POWER_SUPPLY_PROP_CURRENT_NOW:
260		val->intval = power->bat_current_now;
261		break;
262	case POWER_SUPPLY_PROP_CURRENT_AVG:
263		val->intval = power->bat_current_avg;
264		break;
265	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
266		val->intval = power->time_remain;
267		break;
268	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
269		val->intval = power->charge_full_design;
270		break;
271	case POWER_SUPPLY_PROP_CHARGE_FULL:
272		val->intval = power->charge_last_full;
273		break;
274	case POWER_SUPPLY_PROP_CHARGE_EMPTY:
275		val->intval = power->critical_capacity;
276		break;
277	case POWER_SUPPLY_PROP_CHARGE_NOW:
278		val->intval = power->capacity_remain;
279		break;
280	case POWER_SUPPLY_PROP_TEMP:
281		val->intval = power->bat_temperature;
282		break;
283	case POWER_SUPPLY_PROP_MANUFACTURER:
284		val->strval = power->bat_manu;
285		break;
286	case POWER_SUPPLY_PROP_MODEL_NAME:
287		val->strval = power->bat_model;
288		break;
289	case POWER_SUPPLY_PROP_TECHNOLOGY:
290		val->intval = power->bat_type_enum;
291		break;
292	default:
293		return -EINVAL;
294	}
295	return 0;
296}
297
298static enum power_supply_property nvec_power_props[] = {
299	POWER_SUPPLY_PROP_ONLINE,
300};
301
302static enum power_supply_property nvec_battery_props[] = {
303	POWER_SUPPLY_PROP_STATUS,
304	POWER_SUPPLY_PROP_PRESENT,
305	POWER_SUPPLY_PROP_CAPACITY,
306	POWER_SUPPLY_PROP_VOLTAGE_NOW,
307	POWER_SUPPLY_PROP_CURRENT_NOW,
308#ifdef EC_FULL_DIAG
309	POWER_SUPPLY_PROP_CURRENT_AVG,
310	POWER_SUPPLY_PROP_TEMP,
311	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
312#endif
313	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
314	POWER_SUPPLY_PROP_CHARGE_FULL,
315	POWER_SUPPLY_PROP_CHARGE_EMPTY,
316	POWER_SUPPLY_PROP_CHARGE_NOW,
317	POWER_SUPPLY_PROP_MANUFACTURER,
318	POWER_SUPPLY_PROP_MODEL_NAME,
319	POWER_SUPPLY_PROP_TECHNOLOGY,
320};
321
322static char *nvec_power_supplied_to[] = {
323	"battery",
324};
325
326static const struct power_supply_desc nvec_bat_psy_desc = {
327	.name = "battery",
328	.type = POWER_SUPPLY_TYPE_BATTERY,
329	.properties = nvec_battery_props,
330	.num_properties = ARRAY_SIZE(nvec_battery_props),
331	.get_property = nvec_battery_get_property,
332};
333
334static const struct power_supply_desc nvec_psy_desc = {
335	.name = "ac",
336	.type = POWER_SUPPLY_TYPE_MAINS,
337	.properties = nvec_power_props,
338	.num_properties = ARRAY_SIZE(nvec_power_props),
339	.get_property = nvec_power_get_property,
340};
341
342static int counter;
343static int const bat_iter[] = {
344	SLOT_STATUS, VOLTAGE, CURRENT, CAPACITY_REMAINING,
345#ifdef EC_FULL_DIAG
346	AVERAGE_CURRENT, TEMPERATURE, TIME_REMAINING,
347#endif
348};
349
350static void nvec_power_poll(struct work_struct *work)
351{
352	char buf[] = { NVEC_SYS, GET_SYSTEM_STATUS };
353	struct nvec_power *power = container_of(work, struct nvec_power,
354						poller.work);
355
356	if (counter >= ARRAY_SIZE(bat_iter))
357		counter = 0;
358
359/* AC status via sys req */
360	nvec_write_async(power->nvec, buf, 2);
361	msleep(100);
362
363/* select a battery request function via round robin
364   doing it all at once seems to overload the power supply */
365	buf[0] = NVEC_BAT;
366	buf[1] = bat_iter[counter++];
367	nvec_write_async(power->nvec, buf, 2);
368
369	schedule_delayed_work(to_delayed_work(work), msecs_to_jiffies(5000));
370};
371
372static int nvec_power_probe(struct platform_device *pdev)
373{
374	struct power_supply **psy;
375	const struct power_supply_desc *psy_desc;
376	struct nvec_power *power;
377	struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
378	struct power_supply_config psy_cfg = {};
379
380	power = devm_kzalloc(&pdev->dev, sizeof(struct nvec_power), GFP_NOWAIT);
381	if (!power)
382		return -ENOMEM;
383
384	dev_set_drvdata(&pdev->dev, power);
385	power->nvec = nvec;
386
387	switch (pdev->id) {
388	case AC:
389		psy = &nvec_psy;
390		psy_desc = &nvec_psy_desc;
391		psy_cfg.supplied_to = nvec_power_supplied_to;
392		psy_cfg.num_supplicants = ARRAY_SIZE(nvec_power_supplied_to);
393
394		power->notifier.notifier_call = nvec_power_notifier;
395
396		INIT_DELAYED_WORK(&power->poller, nvec_power_poll);
397		schedule_delayed_work(&power->poller, msecs_to_jiffies(5000));
398		break;
399	case BAT:
400		psy = &nvec_bat_psy;
401		psy_desc = &nvec_bat_psy_desc;
402
403		power->notifier.notifier_call = nvec_power_bat_notifier;
404		break;
405	default:
406		return -ENODEV;
407	}
408
409	nvec_register_notifier(nvec, &power->notifier, NVEC_SYS);
410
411	if (pdev->id == BAT)
412		get_bat_mfg_data(power);
413
414	*psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
415
416	return PTR_ERR_OR_ZERO(*psy);
417}
418
419static int nvec_power_remove(struct platform_device *pdev)
420{
421	struct nvec_power *power = platform_get_drvdata(pdev);
422
423	cancel_delayed_work_sync(&power->poller);
424	nvec_unregister_notifier(power->nvec, &power->notifier);
425	switch (pdev->id) {
426	case AC:
427		power_supply_unregister(nvec_psy);
428		break;
429	case BAT:
430		power_supply_unregister(nvec_bat_psy);
431	}
432
433	return 0;
434}
435
436static struct platform_driver nvec_power_driver = {
437	.probe = nvec_power_probe,
438	.remove = nvec_power_remove,
439	.driver = {
440		   .name = "nvec-power",
441		   }
442};
443
444module_platform_driver(nvec_power_driver);
445
446MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
447MODULE_LICENSE("GPL");
448MODULE_DESCRIPTION("NVEC battery and AC driver");
449MODULE_ALIAS("platform:nvec-power");
450