Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / power / s3c_adc_battery.c
1 /*
2  *      iPAQ h1930/h1940/rx1950 battery controller driver
3  *      Copyright (c) Vasily Khoruzhick
4  *      Based on h1940_battery.c by Arnaud Patard
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License.  See the file COPYING in the main directory of this archive for
8  * more details.
9  *
10  */
11
12 #include <linux/interrupt.h>
13 #include <linux/platform_device.h>
14 #include <linux/power_supply.h>
15 #include <linux/leds.h>
16 #include <linux/gpio.h>
17 #include <linux/err.h>
18 #include <linux/timer.h>
19 #include <linux/jiffies.h>
20 #include <linux/s3c_adc_battery.h>
21 #include <linux/errno.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24
25 #include <plat/adc.h>
26
27 #define BAT_POLL_INTERVAL               10000 /* ms */
28 #define JITTER_DELAY                    500 /* ms */
29
30 struct s3c_adc_bat {
31         struct power_supply             *psy;
32         struct s3c_adc_client           *client;
33         struct s3c_adc_bat_pdata        *pdata;
34         int                             volt_value;
35         int                             cur_value;
36         unsigned int                    timestamp;
37         int                             level;
38         int                             status;
39         int                             cable_plugged:1;
40 };
41
42 static struct delayed_work bat_work;
43
44 static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)
45 {
46         schedule_delayed_work(&bat_work,
47                 msecs_to_jiffies(JITTER_DELAY));
48 }
49
50 static int gather_samples(struct s3c_adc_client *client, int num, int channel)
51 {
52         int value, i;
53
54         /* default to 1 if nothing is set */
55         if (num < 1)
56                 num = 1;
57
58         value = 0;
59         for (i = 0; i < num; i++)
60                 value += s3c_adc_read(client, channel);
61         value /= num;
62
63         return value;
64 }
65
66 static enum power_supply_property s3c_adc_backup_bat_props[] = {
67         POWER_SUPPLY_PROP_VOLTAGE_NOW,
68         POWER_SUPPLY_PROP_VOLTAGE_MIN,
69         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
70 };
71
72 static int s3c_adc_backup_bat_get_property(struct power_supply *psy,
73                                 enum power_supply_property psp,
74                                 union power_supply_propval *val)
75 {
76         struct s3c_adc_bat *bat = power_supply_get_drvdata(psy);
77
78         if (!bat) {
79                 dev_err(&psy->dev, "%s: no battery infos ?!\n", __func__);
80                 return -EINVAL;
81         }
82
83         if (bat->volt_value < 0 ||
84                 jiffies_to_msecs(jiffies - bat->timestamp) >
85                         BAT_POLL_INTERVAL) {
86                 bat->volt_value = gather_samples(bat->client,
87                         bat->pdata->backup_volt_samples,
88                         bat->pdata->backup_volt_channel);
89                 bat->volt_value *= bat->pdata->backup_volt_mult;
90                 bat->timestamp = jiffies;
91         }
92
93         switch (psp) {
94         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
95                 val->intval = bat->volt_value;
96                 return 0;
97         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
98                 val->intval = bat->pdata->backup_volt_min;
99                 return 0;
100         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
101                 val->intval = bat->pdata->backup_volt_max;
102                 return 0;
103         default:
104                 return -EINVAL;
105         }
106 }
107
108 static const struct power_supply_desc backup_bat_desc = {
109         .name           = "backup-battery",
110         .type           = POWER_SUPPLY_TYPE_BATTERY,
111         .properties     = s3c_adc_backup_bat_props,
112         .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
113         .get_property   = s3c_adc_backup_bat_get_property,
114         .use_for_apm    = 1,
115 };
116
117 static struct s3c_adc_bat backup_bat;
118
119 static enum power_supply_property s3c_adc_main_bat_props[] = {
120         POWER_SUPPLY_PROP_STATUS,
121         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
122         POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
123         POWER_SUPPLY_PROP_CHARGE_NOW,
124         POWER_SUPPLY_PROP_VOLTAGE_NOW,
125         POWER_SUPPLY_PROP_CURRENT_NOW,
126 };
127
128 static int calc_full_volt(int volt_val, int cur_val, int impedance)
129 {
130         return volt_val + cur_val * impedance / 1000;
131 }
132
133 static int charge_finished(struct s3c_adc_bat *bat)
134 {
135         return bat->pdata->gpio_inverted ?
136                 !gpio_get_value(bat->pdata->gpio_charge_finished) :
137                 gpio_get_value(bat->pdata->gpio_charge_finished);
138 }
139
140 static int s3c_adc_bat_get_property(struct power_supply *psy,
141                                     enum power_supply_property psp,
142                                     union power_supply_propval *val)
143 {
144         struct s3c_adc_bat *bat = power_supply_get_drvdata(psy);
145
146         int new_level;
147         int full_volt;
148         const struct s3c_adc_bat_thresh *lut;
149         unsigned int lut_size;
150
151         if (!bat) {
152                 dev_err(&psy->dev, "no battery infos ?!\n");
153                 return -EINVAL;
154         }
155
156         lut = bat->pdata->lut_noac;
157         lut_size = bat->pdata->lut_noac_cnt;
158
159         if (bat->volt_value < 0 || bat->cur_value < 0 ||
160                 jiffies_to_msecs(jiffies - bat->timestamp) >
161                         BAT_POLL_INTERVAL) {
162                 bat->volt_value = gather_samples(bat->client,
163                         bat->pdata->volt_samples,
164                         bat->pdata->volt_channel) * bat->pdata->volt_mult;
165                 bat->cur_value = gather_samples(bat->client,
166                         bat->pdata->current_samples,
167                         bat->pdata->current_channel) * bat->pdata->current_mult;
168                 bat->timestamp = jiffies;
169         }
170
171         if (bat->cable_plugged &&
172                 ((bat->pdata->gpio_charge_finished < 0) ||
173                 !charge_finished(bat))) {
174                 lut = bat->pdata->lut_acin;
175                 lut_size = bat->pdata->lut_acin_cnt;
176         }
177
178         new_level = 100000;
179         full_volt = calc_full_volt((bat->volt_value / 1000),
180                 (bat->cur_value / 1000), bat->pdata->internal_impedance);
181
182         if (full_volt < calc_full_volt(lut->volt, lut->cur,
183                 bat->pdata->internal_impedance)) {
184                 lut_size--;
185                 while (lut_size--) {
186                         int lut_volt1;
187                         int lut_volt2;
188
189                         lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
190                                 bat->pdata->internal_impedance);
191                         lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
192                                 bat->pdata->internal_impedance);
193                         if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
194                                 new_level = (lut[1].level +
195                                         (lut[0].level - lut[1].level) *
196                                         (full_volt - lut_volt2) /
197                                         (lut_volt1 - lut_volt2)) * 1000;
198                                 break;
199                         }
200                         new_level = lut[1].level * 1000;
201                         lut++;
202                 }
203         }
204
205         bat->level = new_level;
206
207         switch (psp) {
208         case POWER_SUPPLY_PROP_STATUS:
209                 if (bat->pdata->gpio_charge_finished < 0)
210                         val->intval = bat->level == 100000 ?
211                                 POWER_SUPPLY_STATUS_FULL : bat->status;
212                 else
213                         val->intval = bat->status;
214                 return 0;
215         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
216                 val->intval = 100000;
217                 return 0;
218         case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
219                 val->intval = 0;
220                 return 0;
221         case POWER_SUPPLY_PROP_CHARGE_NOW:
222                 val->intval = bat->level;
223                 return 0;
224         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
225                 val->intval = bat->volt_value;
226                 return 0;
227         case POWER_SUPPLY_PROP_CURRENT_NOW:
228                 val->intval = bat->cur_value;
229                 return 0;
230         default:
231                 return -EINVAL;
232         }
233 }
234
235 static const struct power_supply_desc main_bat_desc = {
236         .name                   = "main-battery",
237         .type                   = POWER_SUPPLY_TYPE_BATTERY,
238         .properties             = s3c_adc_main_bat_props,
239         .num_properties         = ARRAY_SIZE(s3c_adc_main_bat_props),
240         .get_property           = s3c_adc_bat_get_property,
241         .external_power_changed = s3c_adc_bat_ext_power_changed,
242         .use_for_apm            = 1,
243 };
244
245 static struct s3c_adc_bat main_bat;
246
247 static void s3c_adc_bat_work(struct work_struct *work)
248 {
249         struct s3c_adc_bat *bat = &main_bat;
250         int is_charged;
251         int is_plugged;
252         static int was_plugged;
253
254         is_plugged = power_supply_am_i_supplied(bat->psy);
255         bat->cable_plugged = is_plugged;
256         if (is_plugged != was_plugged) {
257                 was_plugged = is_plugged;
258                 if (is_plugged) {
259                         if (bat->pdata->enable_charger)
260                                 bat->pdata->enable_charger();
261                         bat->status = POWER_SUPPLY_STATUS_CHARGING;
262                 } else {
263                         if (bat->pdata->disable_charger)
264                                 bat->pdata->disable_charger();
265                         bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
266                 }
267         } else {
268                 if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
269                         is_charged = charge_finished(&main_bat);
270                         if (is_charged) {
271                                 if (bat->pdata->disable_charger)
272                                         bat->pdata->disable_charger();
273                                 bat->status = POWER_SUPPLY_STATUS_FULL;
274                         } else {
275                                 if (bat->pdata->enable_charger)
276                                         bat->pdata->enable_charger();
277                                 bat->status = POWER_SUPPLY_STATUS_CHARGING;
278                         }
279                 }
280         }
281
282         power_supply_changed(bat->psy);
283 }
284
285 static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
286 {
287         schedule_delayed_work(&bat_work,
288                 msecs_to_jiffies(JITTER_DELAY));
289         return IRQ_HANDLED;
290 }
291
292 static int s3c_adc_bat_probe(struct platform_device *pdev)
293 {
294         struct s3c_adc_client   *client;
295         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
296         int ret;
297
298         client = s3c_adc_register(pdev, NULL, NULL, 0);
299         if (IS_ERR(client)) {
300                 dev_err(&pdev->dev, "cannot register adc\n");
301                 return PTR_ERR(client);
302         }
303
304         platform_set_drvdata(pdev, client);
305
306         main_bat.client = client;
307         main_bat.pdata = pdata;
308         main_bat.volt_value = -1;
309         main_bat.cur_value = -1;
310         main_bat.cable_plugged = 0;
311         main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
312
313         main_bat.psy = power_supply_register(&pdev->dev, &main_bat_desc, NULL);
314         if (IS_ERR(main_bat.psy)) {
315                 ret = PTR_ERR(main_bat.psy);
316                 goto err_reg_main;
317         }
318         if (pdata->backup_volt_mult) {
319                 const struct power_supply_config psy_cfg
320                                                 = { .drv_data = &backup_bat, };
321
322                 backup_bat.client = client;
323                 backup_bat.pdata = pdev->dev.platform_data;
324                 backup_bat.volt_value = -1;
325                 backup_bat.psy = power_supply_register(&pdev->dev,
326                                                        &backup_bat_desc,
327                                                        &psy_cfg);
328                 if (IS_ERR(backup_bat.psy)) {
329                         ret = PTR_ERR(backup_bat.psy);
330                         goto err_reg_backup;
331                 }
332         }
333
334         INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
335
336         if (pdata->gpio_charge_finished >= 0) {
337                 ret = gpio_request(pdata->gpio_charge_finished, "charged");
338                 if (ret)
339                         goto err_gpio;
340
341                 ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
342                                 s3c_adc_bat_charged,
343                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
344                                 "battery charged", NULL);
345                 if (ret)
346                         goto err_irq;
347         }
348
349         if (pdata->init) {
350                 ret = pdata->init();
351                 if (ret)
352                         goto err_platform;
353         }
354
355         dev_info(&pdev->dev, "successfully loaded\n");
356         device_init_wakeup(&pdev->dev, 1);
357
358         /* Schedule timer to check current status */
359         schedule_delayed_work(&bat_work,
360                 msecs_to_jiffies(JITTER_DELAY));
361
362         return 0;
363
364 err_platform:
365         if (pdata->gpio_charge_finished >= 0)
366                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
367 err_irq:
368         if (pdata->gpio_charge_finished >= 0)
369                 gpio_free(pdata->gpio_charge_finished);
370 err_gpio:
371         if (pdata->backup_volt_mult)
372                 power_supply_unregister(backup_bat.psy);
373 err_reg_backup:
374         power_supply_unregister(main_bat.psy);
375 err_reg_main:
376         return ret;
377 }
378
379 static int s3c_adc_bat_remove(struct platform_device *pdev)
380 {
381         struct s3c_adc_client *client = platform_get_drvdata(pdev);
382         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
383
384         power_supply_unregister(main_bat.psy);
385         if (pdata->backup_volt_mult)
386                 power_supply_unregister(backup_bat.psy);
387
388         s3c_adc_release(client);
389
390         if (pdata->gpio_charge_finished >= 0) {
391                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
392                 gpio_free(pdata->gpio_charge_finished);
393         }
394
395         cancel_delayed_work(&bat_work);
396
397         if (pdata->exit)
398                 pdata->exit();
399
400         return 0;
401 }
402
403 #ifdef CONFIG_PM
404 static int s3c_adc_bat_suspend(struct platform_device *pdev,
405         pm_message_t state)
406 {
407         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
408
409         if (pdata->gpio_charge_finished >= 0) {
410                 if (device_may_wakeup(&pdev->dev))
411                         enable_irq_wake(
412                                 gpio_to_irq(pdata->gpio_charge_finished));
413                 else {
414                         disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
415                         main_bat.pdata->disable_charger();
416                 }
417         }
418
419         return 0;
420 }
421
422 static int s3c_adc_bat_resume(struct platform_device *pdev)
423 {
424         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
425
426         if (pdata->gpio_charge_finished >= 0) {
427                 if (device_may_wakeup(&pdev->dev))
428                         disable_irq_wake(
429                                 gpio_to_irq(pdata->gpio_charge_finished));
430                 else
431                         enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
432         }
433
434         /* Schedule timer to check current status */
435         schedule_delayed_work(&bat_work,
436                 msecs_to_jiffies(JITTER_DELAY));
437
438         return 0;
439 }
440 #else
441 #define s3c_adc_bat_suspend NULL
442 #define s3c_adc_bat_resume NULL
443 #endif
444
445 static struct platform_driver s3c_adc_bat_driver = {
446         .driver         = {
447                 .name   = "s3c-adc-battery",
448         },
449         .probe          = s3c_adc_bat_probe,
450         .remove         = s3c_adc_bat_remove,
451         .suspend        = s3c_adc_bat_suspend,
452         .resume         = s3c_adc_bat_resume,
453 };
454
455 module_platform_driver(s3c_adc_bat_driver);
456
457 MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
458 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
459 MODULE_LICENSE("GPL");