1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * nvec_power: power supply driver for a NVIDIA compliant embedded controller
4 *
5 * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
6 *
7 * Authors: Ilya Petrov <ilya.muromec@gmail.com>
8 * Marc Dietrich <marvin24@gmx.de>
9 */
10
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/err.h>
14 #include <linux/power_supply.h>
15 #include <linux/slab.h>
16 #include <linux/workqueue.h>
17 #include <linux/delay.h>
18
19 #include "nvec.h"
20
21 #define GET_SYSTEM_STATUS 0x00
22
23 struct nvec_power {
24 struct notifier_block notifier;
25 struct delayed_work poller;
26 struct nvec_chip *nvec;
27 int on;
28 int bat_present;
29 int bat_status;
30 int bat_voltage_now;
31 int bat_current_now;
32 int bat_current_avg;
33 int time_remain;
34 int charge_full_design;
35 int charge_last_full;
36 int critical_capacity;
37 int capacity_remain;
38 int bat_temperature;
39 int bat_cap;
40 int bat_type_enum;
41 char bat_manu[30];
42 char bat_model[30];
43 char bat_type[30];
44 };
45
46 enum {
47 SLOT_STATUS,
48 VOLTAGE,
49 TIME_REMAINING,
50 CURRENT,
51 AVERAGE_CURRENT,
52 AVERAGING_TIME_INTERVAL,
53 CAPACITY_REMAINING,
54 LAST_FULL_CHARGE_CAPACITY,
55 DESIGN_CAPACITY,
56 CRITICAL_CAPACITY,
57 TEMPERATURE,
58 MANUFACTURER,
59 MODEL,
60 TYPE,
61 };
62
63 enum {
64 AC,
65 BAT,
66 };
67
68 struct bat_response {
69 u8 event_type;
70 u8 length;
71 u8 sub_type;
72 u8 status;
73 /* payload */
74 union {
75 char plc[30];
76 u16 plu;
77 s16 pls;
78 };
79 };
80
81 static struct power_supply *nvec_bat_psy;
82 static struct power_supply *nvec_psy;
83
nvec_power_notifier(struct notifier_block * nb,unsigned long event_type,void * data)84 static int nvec_power_notifier(struct notifier_block *nb,
85 unsigned long event_type, void *data)
86 {
87 struct nvec_power *power =
88 container_of(nb, struct nvec_power, notifier);
89 struct bat_response *res = data;
90
91 if (event_type != NVEC_SYS)
92 return NOTIFY_DONE;
93
94 if (res->sub_type == 0) {
95 if (power->on != res->plu) {
96 power->on = res->plu;
97 power_supply_changed(nvec_psy);
98 }
99 return NOTIFY_STOP;
100 }
101 return NOTIFY_OK;
102 }
103
104 static const int bat_init[] = {
105 LAST_FULL_CHARGE_CAPACITY, DESIGN_CAPACITY, CRITICAL_CAPACITY,
106 MANUFACTURER, MODEL, TYPE,
107 };
108
get_bat_mfg_data(struct nvec_power * power)109 static void get_bat_mfg_data(struct nvec_power *power)
110 {
111 int i;
112 char buf[] = { NVEC_BAT, SLOT_STATUS };
113
114 for (i = 0; i < ARRAY_SIZE(bat_init); i++) {
115 buf[1] = bat_init[i];
116 nvec_write_async(power->nvec, buf, 2);
117 }
118 }
119
nvec_power_bat_notifier(struct notifier_block * nb,unsigned long event_type,void * data)120 static int nvec_power_bat_notifier(struct notifier_block *nb,
121 unsigned long event_type, void *data)
122 {
123 struct nvec_power *power =
124 container_of(nb, struct nvec_power, notifier);
125 struct bat_response *res = data;
126 int status_changed = 0;
127
128 if (event_type != NVEC_BAT)
129 return NOTIFY_DONE;
130
131 switch (res->sub_type) {
132 case SLOT_STATUS:
133 if (res->plc[0] & 1) {
134 if (power->bat_present == 0) {
135 status_changed = 1;
136 get_bat_mfg_data(power);
137 }
138
139 power->bat_present = 1;
140
141 switch ((res->plc[0] >> 1) & 3) {
142 case 0:
143 power->bat_status =
144 POWER_SUPPLY_STATUS_NOT_CHARGING;
145 break;
146 case 1:
147 power->bat_status =
148 POWER_SUPPLY_STATUS_CHARGING;
149 break;
150 case 2:
151 power->bat_status =
152 POWER_SUPPLY_STATUS_DISCHARGING;
153 break;
154 default:
155 power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
156 }
157 } else {
158 if (power->bat_present == 1)
159 status_changed = 1;
160
161 power->bat_present = 0;
162 power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
163 }
164 power->bat_cap = res->plc[1];
165 if (status_changed)
166 power_supply_changed(nvec_bat_psy);
167 break;
168 case VOLTAGE:
169 power->bat_voltage_now = res->plu * 1000;
170 break;
171 case TIME_REMAINING:
172 power->time_remain = res->plu * 3600;
173 break;
174 case CURRENT:
175 power->bat_current_now = res->pls * 1000;
176 break;
177 case AVERAGE_CURRENT:
178 power->bat_current_avg = res->pls * 1000;
179 break;
180 case CAPACITY_REMAINING:
181 power->capacity_remain = res->plu * 1000;
182 break;
183 case LAST_FULL_CHARGE_CAPACITY:
184 power->charge_last_full = res->plu * 1000;
185 break;
186 case DESIGN_CAPACITY:
187 power->charge_full_design = res->plu * 1000;
188 break;
189 case CRITICAL_CAPACITY:
190 power->critical_capacity = res->plu * 1000;
191 break;
192 case TEMPERATURE:
193 power->bat_temperature = res->plu - 2732;
194 break;
195 case MANUFACTURER:
196 memcpy(power->bat_manu, &res->plc, res->length - 2);
197 power->bat_model[res->length - 2] = '\0';
198 break;
199 case MODEL:
200 memcpy(power->bat_model, &res->plc, res->length - 2);
201 power->bat_model[res->length - 2] = '\0';
202 break;
203 case TYPE:
204 memcpy(power->bat_type, &res->plc, res->length - 2);
205 power->bat_type[res->length - 2] = '\0';
206 /*
207 * This differs a little from the spec fill in more if you find
208 * some.
209 */
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
nvec_power_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)222 static 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
228 switch (psp) {
229 case POWER_SUPPLY_PROP_ONLINE:
230 val->intval = power->on;
231 break;
232 default:
233 return -EINVAL;
234 }
235 return 0;
236 }
237
nvec_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)238 static int nvec_battery_get_property(struct power_supply *psy,
239 enum power_supply_property psp,
240 union power_supply_propval *val)
241 {
242 struct nvec_power *power = dev_get_drvdata(psy->dev.parent);
243
244 switch (psp) {
245 case POWER_SUPPLY_PROP_STATUS:
246 val->intval = power->bat_status;
247 break;
248 case POWER_SUPPLY_PROP_CAPACITY:
249 val->intval = power->bat_cap;
250 break;
251 case POWER_SUPPLY_PROP_PRESENT:
252 val->intval = power->bat_present;
253 break;
254 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
255 val->intval = power->bat_voltage_now;
256 break;
257 case POWER_SUPPLY_PROP_CURRENT_NOW:
258 val->intval = power->bat_current_now;
259 break;
260 case POWER_SUPPLY_PROP_CURRENT_AVG:
261 val->intval = power->bat_current_avg;
262 break;
263 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
264 val->intval = power->time_remain;
265 break;
266 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
267 val->intval = power->charge_full_design;
268 break;
269 case POWER_SUPPLY_PROP_CHARGE_FULL:
270 val->intval = power->charge_last_full;
271 break;
272 case POWER_SUPPLY_PROP_CHARGE_EMPTY:
273 val->intval = power->critical_capacity;
274 break;
275 case POWER_SUPPLY_PROP_CHARGE_NOW:
276 val->intval = power->capacity_remain;
277 break;
278 case POWER_SUPPLY_PROP_TEMP:
279 val->intval = power->bat_temperature;
280 break;
281 case POWER_SUPPLY_PROP_MANUFACTURER:
282 val->strval = power->bat_manu;
283 break;
284 case POWER_SUPPLY_PROP_MODEL_NAME:
285 val->strval = power->bat_model;
286 break;
287 case POWER_SUPPLY_PROP_TECHNOLOGY:
288 val->intval = power->bat_type_enum;
289 break;
290 default:
291 return -EINVAL;
292 }
293 return 0;
294 }
295
296 static enum power_supply_property nvec_power_props[] = {
297 POWER_SUPPLY_PROP_ONLINE,
298 };
299
300 static enum power_supply_property nvec_battery_props[] = {
301 POWER_SUPPLY_PROP_STATUS,
302 POWER_SUPPLY_PROP_PRESENT,
303 POWER_SUPPLY_PROP_CAPACITY,
304 POWER_SUPPLY_PROP_VOLTAGE_NOW,
305 POWER_SUPPLY_PROP_CURRENT_NOW,
306 #ifdef EC_FULL_DIAG
307 POWER_SUPPLY_PROP_CURRENT_AVG,
308 POWER_SUPPLY_PROP_TEMP,
309 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
310 #endif
311 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
312 POWER_SUPPLY_PROP_CHARGE_FULL,
313 POWER_SUPPLY_PROP_CHARGE_EMPTY,
314 POWER_SUPPLY_PROP_CHARGE_NOW,
315 POWER_SUPPLY_PROP_MANUFACTURER,
316 POWER_SUPPLY_PROP_MODEL_NAME,
317 POWER_SUPPLY_PROP_TECHNOLOGY,
318 };
319
320 static char *nvec_power_supplied_to[] = {
321 "battery",
322 };
323
324 static const struct power_supply_desc nvec_bat_psy_desc = {
325 .name = "battery",
326 .type = POWER_SUPPLY_TYPE_BATTERY,
327 .properties = nvec_battery_props,
328 .num_properties = ARRAY_SIZE(nvec_battery_props),
329 .get_property = nvec_battery_get_property,
330 };
331
332 static const struct power_supply_desc nvec_psy_desc = {
333 .name = "ac",
334 .type = POWER_SUPPLY_TYPE_MAINS,
335 .properties = nvec_power_props,
336 .num_properties = ARRAY_SIZE(nvec_power_props),
337 .get_property = nvec_power_get_property,
338 };
339
340 static int counter;
341 static const int bat_iter[] = {
342 SLOT_STATUS, VOLTAGE, CURRENT, CAPACITY_REMAINING,
343 #ifdef EC_FULL_DIAG
344 AVERAGE_CURRENT, TEMPERATURE, TIME_REMAINING,
345 #endif
346 };
347
nvec_power_poll(struct work_struct * work)348 static void nvec_power_poll(struct work_struct *work)
349 {
350 char buf[] = { NVEC_SYS, GET_SYSTEM_STATUS };
351 struct nvec_power *power = container_of(work, struct nvec_power,
352 poller.work);
353
354 if (counter >= ARRAY_SIZE(bat_iter))
355 counter = 0;
356
357 /* AC status via sys req */
358 nvec_write_async(power->nvec, buf, 2);
359 msleep(100);
360
361 /*
362 * Select a battery request function via round robin doing it all at
363 * once seems to overload the power supply.
364 */
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
nvec_power_probe(struct platform_device * pdev)372 static 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
nvec_power_remove(struct platform_device * pdev)419 static void 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
434 static struct platform_driver nvec_power_driver = {
435 .probe = nvec_power_probe,
436 .remove_new = nvec_power_remove,
437 .driver = {
438 .name = "nvec-power",
439 }
440 };
441
442 module_platform_driver(nvec_power_driver);
443
444 MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
445 MODULE_LICENSE("GPL");
446 MODULE_DESCRIPTION("NVEC battery and AC driver");
447 MODULE_ALIAS("platform:nvec-power");
448