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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
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 = 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 = 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
211
212
213
214 if (!strncmp(power->bat_type, "Li", 30))
215 power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_LION;
216 else
217 power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
218 break;
219 default:
220 return NOTIFY_STOP;
221 }
222
223 return NOTIFY_STOP;
224}
225
226static int nvec_power_get_property(struct power_supply *psy,
227 enum power_supply_property psp,
228 union power_supply_propval *val)
229{
230 struct nvec_power *power = dev_get_drvdata(psy->dev.parent);
231
232 switch (psp) {
233 case POWER_SUPPLY_PROP_ONLINE:
234 val->intval = power->on;
235 break;
236 default:
237 return -EINVAL;
238 }
239 return 0;
240}
241
242static int nvec_battery_get_property(struct power_supply *psy,
243 enum power_supply_property psp,
244 union power_supply_propval *val)
245{
246 struct nvec_power *power = dev_get_drvdata(psy->dev.parent);
247
248 switch (psp) {
249 case POWER_SUPPLY_PROP_STATUS:
250 val->intval = power->bat_status;
251 break;
252 case POWER_SUPPLY_PROP_CAPACITY:
253 val->intval = power->bat_cap;
254 break;
255 case POWER_SUPPLY_PROP_PRESENT:
256 val->intval = power->bat_present;
257 break;
258 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
259 val->intval = power->bat_voltage_now;
260 break;
261 case POWER_SUPPLY_PROP_CURRENT_NOW:
262 val->intval = power->bat_current_now;
263 break;
264 case POWER_SUPPLY_PROP_CURRENT_AVG:
265 val->intval = power->bat_current_avg;
266 break;
267 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
268 val->intval = power->time_remain;
269 break;
270 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
271 val->intval = power->charge_full_design;
272 break;
273 case POWER_SUPPLY_PROP_CHARGE_FULL:
274 val->intval = power->charge_last_full;
275 break;
276 case POWER_SUPPLY_PROP_CHARGE_EMPTY:
277 val->intval = power->critical_capacity;
278 break;
279 case POWER_SUPPLY_PROP_CHARGE_NOW:
280 val->intval = power->capacity_remain;
281 break;
282 case POWER_SUPPLY_PROP_TEMP:
283 val->intval = power->bat_temperature;
284 break;
285 case POWER_SUPPLY_PROP_MANUFACTURER:
286 val->strval = power->bat_manu;
287 break;
288 case POWER_SUPPLY_PROP_MODEL_NAME:
289 val->strval = power->bat_model;
290 break;
291 case POWER_SUPPLY_PROP_TECHNOLOGY:
292 val->intval = power->bat_type_enum;
293 break;
294 default:
295 return -EINVAL;
296 }
297 return 0;
298}
299
300static enum power_supply_property nvec_power_props[] = {
301 POWER_SUPPLY_PROP_ONLINE,
302};
303
304static enum power_supply_property nvec_battery_props[] = {
305 POWER_SUPPLY_PROP_STATUS,
306 POWER_SUPPLY_PROP_PRESENT,
307 POWER_SUPPLY_PROP_CAPACITY,
308 POWER_SUPPLY_PROP_VOLTAGE_NOW,
309 POWER_SUPPLY_PROP_CURRENT_NOW,
310#ifdef EC_FULL_DIAG
311 POWER_SUPPLY_PROP_CURRENT_AVG,
312 POWER_SUPPLY_PROP_TEMP,
313 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
314#endif
315 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
316 POWER_SUPPLY_PROP_CHARGE_FULL,
317 POWER_SUPPLY_PROP_CHARGE_EMPTY,
318 POWER_SUPPLY_PROP_CHARGE_NOW,
319 POWER_SUPPLY_PROP_MANUFACTURER,
320 POWER_SUPPLY_PROP_MODEL_NAME,
321 POWER_SUPPLY_PROP_TECHNOLOGY,
322};
323
324static char *nvec_power_supplied_to[] = {
325 "battery",
326};
327
328static const struct power_supply_desc nvec_bat_psy_desc = {
329 .name = "battery",
330 .type = POWER_SUPPLY_TYPE_BATTERY,
331 .properties = nvec_battery_props,
332 .num_properties = ARRAY_SIZE(nvec_battery_props),
333 .get_property = nvec_battery_get_property,
334};
335
336static const struct power_supply_desc nvec_psy_desc = {
337 .name = "ac",
338 .type = POWER_SUPPLY_TYPE_MAINS,
339 .properties = nvec_power_props,
340 .num_properties = ARRAY_SIZE(nvec_power_props),
341 .get_property = nvec_power_get_property,
342};
343
344static int counter;
345static int const bat_iter[] = {
346 SLOT_STATUS, VOLTAGE, CURRENT, CAPACITY_REMAINING,
347#ifdef EC_FULL_DIAG
348 AVERAGE_CURRENT, TEMPERATURE, TIME_REMAINING,
349#endif
350};
351
352static void nvec_power_poll(struct work_struct *work)
353{
354 char buf[] = { NVEC_SYS, GET_SYSTEM_STATUS };
355 struct nvec_power *power = container_of(work, struct nvec_power,
356 poller.work);
357
358 if (counter >= ARRAY_SIZE(bat_iter))
359 counter = 0;
360
361
362 nvec_write_async(power->nvec, buf, 2);
363 msleep(100);
364
365
366
367
368
369 buf[0] = NVEC_BAT;
370 buf[1] = bat_iter[counter++];
371 nvec_write_async(power->nvec, buf, 2);
372
373 schedule_delayed_work(to_delayed_work(work), msecs_to_jiffies(5000));
374};
375
376static int nvec_power_probe(struct platform_device *pdev)
377{
378 struct power_supply **psy;
379 const struct power_supply_desc *psy_desc;
380 struct nvec_power *power;
381 struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
382 struct power_supply_config psy_cfg = {};
383
384 power = devm_kzalloc(&pdev->dev, sizeof(struct nvec_power), GFP_NOWAIT);
385 if (!power)
386 return -ENOMEM;
387
388 dev_set_drvdata(&pdev->dev, power);
389 power->nvec = nvec;
390
391 switch (pdev->id) {
392 case AC:
393 psy = &nvec_psy;
394 psy_desc = &nvec_psy_desc;
395 psy_cfg.supplied_to = nvec_power_supplied_to;
396 psy_cfg.num_supplicants = ARRAY_SIZE(nvec_power_supplied_to);
397
398 power->notifier.notifier_call = nvec_power_notifier;
399
400 INIT_DELAYED_WORK(&power->poller, nvec_power_poll);
401 schedule_delayed_work(&power->poller, msecs_to_jiffies(5000));
402 break;
403 case BAT:
404 psy = &nvec_bat_psy;
405 psy_desc = &nvec_bat_psy_desc;
406
407 power->notifier.notifier_call = nvec_power_bat_notifier;
408 break;
409 default:
410 return -ENODEV;
411 }
412
413 nvec_register_notifier(nvec, &power->notifier, NVEC_SYS);
414
415 if (pdev->id == BAT)
416 get_bat_mfg_data(power);
417
418 *psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
419
420 return PTR_ERR_OR_ZERO(*psy);
421}
422
423static int nvec_power_remove(struct platform_device *pdev)
424{
425 struct nvec_power *power = platform_get_drvdata(pdev);
426
427 cancel_delayed_work_sync(&power->poller);
428 nvec_unregister_notifier(power->nvec, &power->notifier);
429 switch (pdev->id) {
430 case AC:
431 power_supply_unregister(nvec_psy);
432 break;
433 case BAT:
434 power_supply_unregister(nvec_bat_psy);
435 }
436
437 return 0;
438}
439
440static struct platform_driver nvec_power_driver = {
441 .probe = nvec_power_probe,
442 .remove = nvec_power_remove,
443 .driver = {
444 .name = "nvec-power",
445 }
446};
447
448module_platform_driver(nvec_power_driver);
449
450MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
451MODULE_LICENSE("GPL");
452MODULE_DESCRIPTION("NVEC battery and AC driver");
453MODULE_ALIAS("platform:nvec-power");
454
