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
25struct nvec_power {
26	struct notifier_block notifier;
27	struct delayed_work poller;
28	struct nvec_chip *nvec;
29	int on;
30	int bat_present;
31	int bat_status;
32	int bat_voltage_now;
33	int bat_current_now;
34	int bat_current_avg;
35	int time_remain;
36	int charge_full_design;
37	int charge_last_full;
38	int critical_capacity;
39	int capacity_remain;
40	int bat_temperature;
41	int bat_cap;
42	int bat_type_enum;
43	char bat_manu[30];
44	char bat_model[30];
45	char bat_type[30];
46};
47
48enum {
49	SLOT_STATUS,
50	VOLTAGE,
51	TIME_REMAINING,
52	CURRENT,
53	AVERAGE_CURRENT,
54	AVERAGING_TIME_INTERVAL,
55	CAPACITY_REMAINING,
56	LAST_FULL_CHARGE_CAPACITY,
57	DESIGN_CAPACITY,
58	CRITICAL_CAPACITY,
59	TEMPERATURE,
60	MANUFACTURER,
61	MODEL,
62	TYPE,
63};
64
65enum {
66	AC,
67	BAT,
68};
69
70struct bat_response {
71	u8 event_type;
72	u8 length;
73	u8 sub_type;
74	u8 status;
75	/* payload */
76	union {
77		char plc[30];
78		u16 plu;
79		s16 pls;
80	};
81};
82
83static struct power_supply nvec_bat_psy;
84static struct power_supply nvec_psy;
85
86static int nvec_power_notifier(struct notifier_block *nb,
87			       unsigned long event_type, void *data)
88{
89	struct nvec_power *power =
90	    container_of(nb, struct nvec_power, notifier);
91	struct bat_response *res = (struct bat_response *)data;
92
93	if (event_type != NVEC_SYS)
94		return NOTIFY_DONE;
95
96	if (res->sub_type == 0) {
97		if (power->on != res->plu) {
98			power->on = res->plu;
99			power_supply_changed(&nvec_psy);
100		}
101		return NOTIFY_STOP;
102	}
103	return NOTIFY_OK;
104}
105
106static const int bat_init[] = {
107	LAST_FULL_CHARGE_CAPACITY, DESIGN_CAPACITY, CRITICAL_CAPACITY,
108	MANUFACTURER, MODEL, TYPE,
109};
110
111static void get_bat_mfg_data(struct nvec_power *power)
112{
113	int i;
114	char buf[] = { '\x02', '\x00' };
115
116	for (i = 0; i < ARRAY_SIZE(bat_init); i++) {
117		buf[1] = bat_init[i];
118		nvec_write_async(power->nvec, buf, 2);
119	}
120}
121
122static int nvec_power_bat_notifier(struct notifier_block *nb,
123				   unsigned long event_type, void *data)
124{
125	struct nvec_power *power =
126	    container_of(nb, struct nvec_power, notifier);
127	struct bat_response *res = (struct bat_response *)data;
128	int status_changed = 0;
129
130	if (event_type != NVEC_BAT)
131		return NOTIFY_DONE;
132
133	switch (res->sub_type) {
134	case SLOT_STATUS:
135		if (res->plc[0] & 1) {
136			if (power->bat_present == 0) {
137				status_changed = 1;
138				get_bat_mfg_data(power);
139			}
140
141			power->bat_present = 1;
142
143			switch ((res->plc[0] >> 1) & 3) {
144			case 0:
145				power->bat_status =
146				    POWER_SUPPLY_STATUS_NOT_CHARGING;
147				break;
148			case 1:
149				power->bat_status =
150				    POWER_SUPPLY_STATUS_CHARGING;
151				break;
152			case 2:
153				power->bat_status =
154				    POWER_SUPPLY_STATUS_DISCHARGING;
155				break;
156			default:
157				power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
158			}
159		} else {
160			if (power->bat_present == 1)
161				status_changed = 1;
162
163			power->bat_present = 0;
164			power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
165		}
166		power->bat_cap = res->plc[1];
167		if (status_changed)
168			power_supply_changed(&nvec_bat_psy);
169		break;
170	case VOLTAGE:
171		power->bat_voltage_now = res->plu * 1000;
172		break;
173	case TIME_REMAINING:
174		power->time_remain = res->plu * 3600;
175		break;
176	case CURRENT:
177		power->bat_current_now = res->pls * 1000;
178		break;
179	case AVERAGE_CURRENT:
180		power->bat_current_avg = res->pls * 1000;
181		break;
182	case CAPACITY_REMAINING:
183		power->capacity_remain = res->plu * 1000;
184		break;
185	case LAST_FULL_CHARGE_CAPACITY:
186		power->charge_last_full = res->plu * 1000;
187		break;
188	case DESIGN_CAPACITY:
189		power->charge_full_design = res->plu * 1000;
190		break;
191	case CRITICAL_CAPACITY:
192		power->critical_capacity = res->plu * 1000;
193		break;
194	case TEMPERATURE:
195		power->bat_temperature = res->plu - 2732;
196		break;
197	case MANUFACTURER:
198		memcpy(power->bat_manu, &res->plc, res->length - 2);
199		power->bat_model[res->length - 2] = '\0';
200		break;
201	case MODEL:
202		memcpy(power->bat_model, &res->plc, res->length - 2);
203		power->bat_model[res->length - 2] = '\0';
204		break;
205	case TYPE:
206		memcpy(power->bat_type, &res->plc, res->length - 2);
207		power->bat_type[res->length - 2] = '\0';
208		/* this differs a little from the spec
209		   fill in more if you find some */
210		if (!strncmp(power->bat_type, "Li", 30))
211			power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_LION;
212		else
213			power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
214		break;
215	default:
216		return NOTIFY_STOP;
217	}
218
219	return NOTIFY_STOP;
220}
221
222static int nvec_power_get_property(struct power_supply *psy,
223				   enum power_supply_property psp,
224				   union power_supply_propval *val)
225{
226	struct nvec_power *power = dev_get_drvdata(psy->dev->parent);
227	switch (psp) {
228	case POWER_SUPPLY_PROP_ONLINE:
229		val->intval = power->on;
230		break;
231	default:
232		return -EINVAL;
233	}
234	return 0;
235}
236
237static int nvec_battery_get_property(struct power_supply *psy,
238				     enum power_supply_property psp,
239				     union power_supply_propval *val)
240{
241	struct nvec_power *power = dev_get_drvdata(psy->dev->parent);
242
243	switch (psp) {
244	case POWER_SUPPLY_PROP_STATUS:
245		val->intval = power->bat_status;
246		break;
247	case POWER_SUPPLY_PROP_CAPACITY:
248		val->intval = power->bat_cap;
249		break;
250	case POWER_SUPPLY_PROP_PRESENT:
251		val->intval = power->bat_present;
252		break;
253	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
254		val->intval = power->bat_voltage_now;
255		break;
256	case POWER_SUPPLY_PROP_CURRENT_NOW:
257		val->intval = power->bat_current_now;
258		break;
259	case POWER_SUPPLY_PROP_CURRENT_AVG:
260		val->intval = power->bat_current_avg;
261		break;
262	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
263		val->intval = power->time_remain;
264		break;
265	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
266		val->intval = power->charge_full_design;
267		break;
268	case POWER_SUPPLY_PROP_CHARGE_FULL:
269		val->intval = power->charge_last_full;
270		break;
271	case POWER_SUPPLY_PROP_CHARGE_EMPTY:
272		val->intval = power->critical_capacity;
273		break;
274	case POWER_SUPPLY_PROP_CHARGE_NOW:
275		val->intval = power->capacity_remain;
276		break;
277	case POWER_SUPPLY_PROP_TEMP:
278		val->intval = power->bat_temperature;
279		break;
280	case POWER_SUPPLY_PROP_MANUFACTURER:
281		val->strval = power->bat_manu;
282		break;
283	case POWER_SUPPLY_PROP_MODEL_NAME:
284		val->strval = power->bat_model;
285		break;
286	case POWER_SUPPLY_PROP_TECHNOLOGY:
287		val->intval = power->bat_type_enum;
288		break;
289	default:
290		return -EINVAL;
291	}
292	return 0;
293}
294
295static enum power_supply_property nvec_power_props[] = {
296	POWER_SUPPLY_PROP_ONLINE,
297};
298
299static enum power_supply_property nvec_battery_props[] = {
300	POWER_SUPPLY_PROP_STATUS,
301	POWER_SUPPLY_PROP_PRESENT,
302	POWER_SUPPLY_PROP_CAPACITY,
303	POWER_SUPPLY_PROP_VOLTAGE_NOW,
304	POWER_SUPPLY_PROP_CURRENT_NOW,
305#ifdef EC_FULL_DIAG
306	POWER_SUPPLY_PROP_CURRENT_AVG,
307	POWER_SUPPLY_PROP_TEMP,
308	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
309#endif
310	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
311	POWER_SUPPLY_PROP_CHARGE_FULL,
312	POWER_SUPPLY_PROP_CHARGE_EMPTY,
313	POWER_SUPPLY_PROP_CHARGE_NOW,
314	POWER_SUPPLY_PROP_MANUFACTURER,
315	POWER_SUPPLY_PROP_MODEL_NAME,
316	POWER_SUPPLY_PROP_TECHNOLOGY,
317};
318
319static char *nvec_power_supplied_to[] = {
320	"battery",
321};
322
323static struct power_supply nvec_bat_psy = {
324	.name = "battery",
325	.type = POWER_SUPPLY_TYPE_BATTERY,
326	.properties = nvec_battery_props,
327	.num_properties = ARRAY_SIZE(nvec_battery_props),
328	.get_property = nvec_battery_get_property,
329};
330
331static struct power_supply nvec_psy = {
332	.name = "ac",
333	.type = POWER_SUPPLY_TYPE_MAINS,
334	.supplied_to = nvec_power_supplied_to,
335	.num_supplicants = ARRAY_SIZE(nvec_power_supplied_to),
336	.properties = nvec_power_props,
337	.num_properties = ARRAY_SIZE(nvec_power_props),
338	.get_property = nvec_power_get_property,
339};
340
341static int counter;
342static int const bat_iter[] = {
343	SLOT_STATUS, VOLTAGE, CURRENT, CAPACITY_REMAINING,
344#ifdef EC_FULL_DIAG
345	AVERAGE_CURRENT, TEMPERATURE, TIME_REMAINING,
346#endif
347};
348
349static void nvec_power_poll(struct work_struct *work)
350{
351	char buf[] = { '\x01', '\x00' };
352	struct nvec_power *power = container_of(work, struct nvec_power,
353						poller.work);
354
355	if (counter >= ARRAY_SIZE(bat_iter))
356		counter = 0;
357
358/* AC status via sys req */
359	nvec_write_async(power->nvec, buf, 2);
360	msleep(100);
361
362/* select a battery request function via round robin
363   doing it all at once seems to overload the power supply */
364	buf[0] = '\x02';	/* battery */
365	buf[1] = bat_iter[counter++];
366	nvec_write_async(power->nvec, buf, 2);
367
368	schedule_delayed_work(to_delayed_work(work), msecs_to_jiffies(5000));
369};
370
371static int __devinit nvec_power_probe(struct platform_device *pdev)
372{
373	struct power_supply *psy;
374	struct nvec_power *power =
375	    kzalloc(sizeof(struct nvec_power), GFP_NOWAIT);
376	struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
377
378	dev_set_drvdata(&pdev->dev, power);
379	power->nvec = nvec;
380
381	switch (pdev->id) {
382	case AC:
383		psy = &nvec_psy;
384
385		power->notifier.notifier_call = nvec_power_notifier;
386
387		INIT_DELAYED_WORK(&power->poller, nvec_power_poll);
388		schedule_delayed_work(&power->poller, msecs_to_jiffies(5000));
389		break;
390	case BAT:
391		psy = &nvec_bat_psy;
392
393		power->notifier.notifier_call = nvec_power_bat_notifier;
394		break;
395	default:
396		kfree(power);
397		return -ENODEV;
398	}
399
400	nvec_register_notifier(nvec, &power->notifier, NVEC_SYS);
401
402	if (pdev->id == BAT)
403		get_bat_mfg_data(power);
404
405	return power_supply_register(&pdev->dev, psy);
406}
407
408static struct platform_driver nvec_power_driver = {
409	.probe = nvec_power_probe,
410	.driver = {
411		   .name = "nvec-power",
412		   .owner = THIS_MODULE,
413		   }
414};
415
416static int __init nvec_power_init(void)
417{
418	return platform_driver_register(&nvec_power_driver);
419}
420
421module_init(nvec_power_init);
422
423MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
424MODULE_LICENSE("GPL");
425MODULE_DESCRIPTION("NVEC battery and AC driver");
426MODULE_ALIAS("platform:nvec-power");
427