Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

Linux/drivers/staging/nvec/nvec_power.c

  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 
 27 struct 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 
 50 enum {
 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 
 67 enum {
 68         AC,
 69         BAT,
 70 };
 71 
 72 struct 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 
 85 static struct power_supply *nvec_bat_psy;
 86 static struct power_supply *nvec_psy;
 87 
 88 static 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 
108 static const int bat_init[] = {
109         LAST_FULL_CHARGE_CAPACITY, DESIGN_CAPACITY, CRITICAL_CAPACITY,
110         MANUFACTURER, MODEL, TYPE,
111 };
112 
113 static 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 
124 static 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                 /*
211                  * This differs a little from the spec fill in more if you find
212                  * some.
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 
226 static 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 
242 static 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 
300 static enum power_supply_property nvec_power_props[] = {
301         POWER_SUPPLY_PROP_ONLINE,
302 };
303 
304 static 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 
324 static char *nvec_power_supplied_to[] = {
325         "battery",
326 };
327 
328 static 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 
336 static 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 
344 static int counter;
345 static 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 
352 static 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         /* AC status via sys req */
362         nvec_write_async(power->nvec, buf, 2);
363         msleep(100);
364 
365         /*
366          * Select a battery request function via round robin doing it all at
367          * once seems to overload the power supply.
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 
376 static 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 
423 static 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 
440 static 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 
448 module_platform_driver(nvec_power_driver);
449 
450 MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
451 MODULE_LICENSE("GPL");
452 MODULE_DESCRIPTION("NVEC battery and AC driver");
453 MODULE_ALIAS("platform:nvec-power");
454 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us