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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                 /* 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 
224 static 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 
240 static 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 
298 static enum power_supply_property nvec_power_props[] = {
299         POWER_SUPPLY_PROP_ONLINE,
300 };
301 
302 static 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 
322 static char *nvec_power_supplied_to[] = {
323         "battery",
324 };
325 
326 static struct power_supply nvec_bat_psy = {
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 
334 static struct power_supply nvec_psy = {
335         .name = "ac",
336         .type = POWER_SUPPLY_TYPE_MAINS,
337         .supplied_to = nvec_power_supplied_to,
338         .num_supplicants = ARRAY_SIZE(nvec_power_supplied_to),
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 /* select a battery request function via round robin
366    doing it all at once seems to overload the power supply */
367         buf[0] = NVEC_BAT;
368         buf[1] = bat_iter[counter++];
369         nvec_write_async(power->nvec, buf, 2);
370 
371         schedule_delayed_work(to_delayed_work(work), msecs_to_jiffies(5000));
372 };
373 
374 static int nvec_power_probe(struct platform_device *pdev)
375 {
376         struct power_supply *psy;
377         struct nvec_power *power;
378         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
379 
380         power = devm_kzalloc(&pdev->dev, sizeof(struct nvec_power), GFP_NOWAIT);
381         if (power == NULL)
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 
391                 power->notifier.notifier_call = nvec_power_notifier;
392 
393                 INIT_DELAYED_WORK(&power->poller, nvec_power_poll);
394                 schedule_delayed_work(&power->poller, msecs_to_jiffies(5000));
395                 break;
396         case BAT:
397                 psy = &nvec_bat_psy;
398 
399                 power->notifier.notifier_call = nvec_power_bat_notifier;
400                 break;
401         default:
402                 return -ENODEV;
403         }
404 
405         nvec_register_notifier(nvec, &power->notifier, NVEC_SYS);
406 
407         if (pdev->id == BAT)
408                 get_bat_mfg_data(power);
409 
410         return power_supply_register(&pdev->dev, psy);
411 }
412 
413 static int nvec_power_remove(struct platform_device *pdev)
414 {
415         struct nvec_power *power = platform_get_drvdata(pdev);
416 
417         cancel_delayed_work_sync(&power->poller);
418         nvec_unregister_notifier(power->nvec, &power->notifier);
419         switch (pdev->id) {
420         case AC:
421                 power_supply_unregister(&nvec_psy);
422                 break;
423         case BAT:
424                 power_supply_unregister(&nvec_bat_psy);
425         }
426 
427         return 0;
428 }
429 
430 static struct platform_driver nvec_power_driver = {
431         .probe = nvec_power_probe,
432         .remove = nvec_power_remove,
433         .driver = {
434                    .name = "nvec-power",
435                    .owner = THIS_MODULE,
436                    }
437 };
438 
439 module_platform_driver(nvec_power_driver);
440 
441 MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
442 MODULE_LICENSE("GPL");
443 MODULE_DESCRIPTION("NVEC battery and AC driver");
444 MODULE_ALIAS("platform:nvec-power");
445 

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