a675e31b4f132d507cd2c8c72ac09a5ada5cac0b
[linux-2.6.git] / 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
24 #include <plat/adc.h>
25
26 #define BAT_POLL_INTERVAL               10000 /* ms */
27 #define JITTER_DELAY                    500 /* ms */
28
29 struct s3c_adc_bat {
30         struct power_supply             psy;
31         struct s3c_adc_client           *client;
32         struct s3c_adc_bat_pdata        *pdata;
33         int                             volt_value;
34         int                             cur_value;
35         unsigned int                    timestamp;
36         int                             level;
37         int                             status;
38         int                             cable_plugged:1;
39 };
40
41 static struct delayed_work bat_work;
42
43 static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)
44 {
45         schedule_delayed_work(&bat_work,
46                 msecs_to_jiffies(JITTER_DELAY));
47 }
48
49 static enum power_supply_property s3c_adc_backup_bat_props[] = {
50         POWER_SUPPLY_PROP_VOLTAGE_NOW,
51         POWER_SUPPLY_PROP_VOLTAGE_MIN,
52         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
53 };
54
55 static int s3c_adc_backup_bat_get_property(struct power_supply *psy,
56                                 enum power_supply_property psp,
57                                 union power_supply_propval *val)
58 {
59         struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
60
61         if (!bat) {
62                 dev_err(psy->dev, "%s: no battery infos ?!\n", __func__);
63                 return -EINVAL;
64         }
65
66         if (bat->volt_value < 0 ||
67                 jiffies_to_msecs(jiffies - bat->timestamp) >
68                         BAT_POLL_INTERVAL) {
69                 bat->volt_value = s3c_adc_read(bat->client,
70                         bat->pdata->backup_volt_channel);
71                 bat->volt_value *= bat->pdata->backup_volt_mult;
72                 bat->timestamp = jiffies;
73         }
74
75         switch (psp) {
76         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
77                 val->intval = bat->volt_value;
78                 return 0;
79         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
80                 val->intval = bat->pdata->backup_volt_min;
81                 return 0;
82         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
83                 val->intval = bat->pdata->backup_volt_max;
84                 return 0;
85         default:
86                 return -EINVAL;
87         }
88 }
89
90 static struct s3c_adc_bat backup_bat = {
91         .psy = {
92                 .name           = "backup-battery",
93                 .type           = POWER_SUPPLY_TYPE_BATTERY,
94                 .properties     = s3c_adc_backup_bat_props,
95                 .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
96                 .get_property   = s3c_adc_backup_bat_get_property,
97                 .use_for_apm    = 1,
98         },
99 };
100
101 static enum power_supply_property s3c_adc_main_bat_props[] = {
102         POWER_SUPPLY_PROP_STATUS,
103         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
104         POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
105         POWER_SUPPLY_PROP_CHARGE_NOW,
106         POWER_SUPPLY_PROP_VOLTAGE_NOW,
107         POWER_SUPPLY_PROP_CURRENT_NOW,
108 };
109
110 static int calc_full_volt(int volt_val, int cur_val, int impedance)
111 {
112         return volt_val + cur_val * impedance / 1000;
113 }
114
115 static int charge_finished(struct s3c_adc_bat *bat)
116 {
117         return bat->pdata->gpio_inverted ?
118                 !gpio_get_value(bat->pdata->gpio_charge_finished) :
119                 gpio_get_value(bat->pdata->gpio_charge_finished);
120 }
121
122 static int s3c_adc_bat_get_property(struct power_supply *psy,
123                                     enum power_supply_property psp,
124                                     union power_supply_propval *val)
125 {
126         struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
127
128         int new_level;
129         int full_volt;
130         const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac;
131         unsigned int lut_size = bat->pdata->lut_noac_cnt;
132
133         if (!bat) {
134                 dev_err(psy->dev, "no battery infos ?!\n");
135                 return -EINVAL;
136         }
137
138         if (bat->volt_value < 0 || bat->cur_value < 0 ||
139                 jiffies_to_msecs(jiffies - bat->timestamp) >
140                         BAT_POLL_INTERVAL) {
141                 bat->volt_value = s3c_adc_read(bat->client,
142                         bat->pdata->volt_channel) * bat->pdata->volt_mult;
143                 bat->cur_value = s3c_adc_read(bat->client,
144                         bat->pdata->current_channel) * bat->pdata->current_mult;
145                 bat->timestamp = jiffies;
146         }
147
148         if (bat->cable_plugged &&
149                 ((bat->pdata->gpio_charge_finished < 0) ||
150                 !charge_finished(bat))) {
151                 lut = bat->pdata->lut_acin;
152                 lut_size = bat->pdata->lut_acin_cnt;
153         }
154
155         new_level = 100000;
156         full_volt = calc_full_volt((bat->volt_value / 1000),
157                 (bat->cur_value / 1000), bat->pdata->internal_impedance);
158
159         if (full_volt < calc_full_volt(lut->volt, lut->cur,
160                 bat->pdata->internal_impedance)) {
161                 lut_size--;
162                 while (lut_size--) {
163                         int lut_volt1;
164                         int lut_volt2;
165
166                         lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
167                                 bat->pdata->internal_impedance);
168                         lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
169                                 bat->pdata->internal_impedance);
170                         if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
171                                 new_level = (lut[1].level +
172                                         (lut[0].level - lut[1].level) *
173                                         (full_volt - lut_volt2) /
174                                         (lut_volt1 - lut_volt2)) * 1000;
175                                 break;
176                         }
177                         new_level = lut[1].level * 1000;
178                         lut++;
179                 }
180         }
181
182         bat->level = new_level;
183
184         switch (psp) {
185         case POWER_SUPPLY_PROP_STATUS:
186                 if (bat->pdata->gpio_charge_finished < 0)
187                         val->intval = bat->level == 100000 ?
188                                 POWER_SUPPLY_STATUS_FULL : bat->status;
189                 else
190                         val->intval = bat->status;
191                 return 0;
192         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
193                 val->intval = 100000;
194                 return 0;
195         case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
196                 val->intval = 0;
197                 return 0;
198         case POWER_SUPPLY_PROP_CHARGE_NOW:
199                 val->intval = bat->level;
200                 return 0;
201         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
202                 val->intval = bat->volt_value;
203                 return 0;
204         case POWER_SUPPLY_PROP_CURRENT_NOW:
205                 val->intval = bat->cur_value;
206                 return 0;
207         default:
208                 return -EINVAL;
209         }
210 }
211
212 static struct s3c_adc_bat main_bat = {
213         .psy = {
214                 .name                   = "main-battery",
215                 .type                   = POWER_SUPPLY_TYPE_BATTERY,
216                 .properties             = s3c_adc_main_bat_props,
217                 .num_properties         = ARRAY_SIZE(s3c_adc_main_bat_props),
218                 .get_property           = s3c_adc_bat_get_property,
219                 .external_power_changed = s3c_adc_bat_ext_power_changed,
220                 .use_for_apm            = 1,
221         },
222 };
223
224 static void s3c_adc_bat_work(struct work_struct *work)
225 {
226         struct s3c_adc_bat *bat = &main_bat;
227         int is_charged;
228         int is_plugged;
229         static int was_plugged;
230
231         is_plugged = power_supply_am_i_supplied(&bat->psy);
232         bat->cable_plugged = is_plugged;
233         if (is_plugged != was_plugged) {
234                 was_plugged = is_plugged;
235                 if (is_plugged) {
236                         if (bat->pdata->enable_charger)
237                                 bat->pdata->enable_charger();
238                         bat->status = POWER_SUPPLY_STATUS_CHARGING;
239                 } else {
240                         if (bat->pdata->disable_charger)
241                                 bat->pdata->disable_charger();
242                         bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
243                 }
244         } else {
245                 if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
246                         is_charged = charge_finished(&main_bat);
247                         if (is_charged) {
248                                 if (bat->pdata->disable_charger)
249                                         bat->pdata->disable_charger();
250                                 bat->status = POWER_SUPPLY_STATUS_FULL;
251                         } else {
252                                 if (bat->pdata->enable_charger)
253                                         bat->pdata->enable_charger();
254                                 bat->status = POWER_SUPPLY_STATUS_CHARGING;
255                         }
256                 }
257         }
258
259         power_supply_changed(&bat->psy);
260 }
261
262 static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
263 {
264         schedule_delayed_work(&bat_work,
265                 msecs_to_jiffies(JITTER_DELAY));
266         return IRQ_HANDLED;
267 }
268
269 static int __devinit s3c_adc_bat_probe(struct platform_device *pdev)
270 {
271         struct s3c_adc_client   *client;
272         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
273         int ret;
274
275         client = s3c_adc_register(pdev, NULL, NULL, 0);
276         if (IS_ERR(client)) {
277                 dev_err(&pdev->dev, "cannot register adc\n");
278                 return PTR_ERR(client);
279         }
280
281         platform_set_drvdata(pdev, client);
282
283         main_bat.client = client;
284         main_bat.pdata = pdata;
285         main_bat.volt_value = -1;
286         main_bat.cur_value = -1;
287         main_bat.cable_plugged = 0;
288         main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
289
290         ret = power_supply_register(&pdev->dev, &main_bat.psy);
291         if (ret)
292                 goto err_reg_main;
293         if (pdata->backup_volt_mult) {
294                 backup_bat.client = client;
295                 backup_bat.pdata = pdev->dev.platform_data;
296                 backup_bat.volt_value = -1;
297                 ret = power_supply_register(&pdev->dev, &backup_bat.psy);
298                 if (ret)
299                         goto err_reg_backup;
300         }
301
302         INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
303
304         if (pdata->gpio_charge_finished >= 0) {
305                 ret = gpio_request(pdata->gpio_charge_finished, "charged");
306                 if (ret)
307                         goto err_gpio;
308
309                 ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
310                                 s3c_adc_bat_charged,
311                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
312                                 "battery charged", NULL);
313                 if (ret)
314                         goto err_irq;
315         }
316
317         if (pdata->init) {
318                 ret = pdata->init();
319                 if (ret)
320                         goto err_platform;
321         }
322
323         dev_info(&pdev->dev, "successfully loaded\n");
324         device_init_wakeup(&pdev->dev, 1);
325
326         /* Schedule timer to check current status */
327         schedule_delayed_work(&bat_work,
328                 msecs_to_jiffies(JITTER_DELAY));
329
330         return 0;
331
332 err_platform:
333         if (pdata->gpio_charge_finished >= 0)
334                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
335 err_irq:
336         if (pdata->gpio_charge_finished >= 0)
337                 gpio_free(pdata->gpio_charge_finished);
338 err_gpio:
339         if (pdata->backup_volt_mult)
340                 power_supply_unregister(&backup_bat.psy);
341 err_reg_backup:
342         power_supply_unregister(&main_bat.psy);
343 err_reg_main:
344         return ret;
345 }
346
347 static int s3c_adc_bat_remove(struct platform_device *pdev)
348 {
349         struct s3c_adc_client *client = platform_get_drvdata(pdev);
350         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
351
352         power_supply_unregister(&main_bat.psy);
353         if (pdata->backup_volt_mult)
354                 power_supply_unregister(&backup_bat.psy);
355
356         s3c_adc_release(client);
357
358         if (pdata->gpio_charge_finished >= 0) {
359                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
360                 gpio_free(pdata->gpio_charge_finished);
361         }
362
363         cancel_delayed_work(&bat_work);
364
365         if (pdata->exit)
366                 pdata->exit();
367
368         return 0;
369 }
370
371 #ifdef CONFIG_PM
372 static int s3c_adc_bat_suspend(struct platform_device *pdev,
373         pm_message_t state)
374 {
375         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
376
377         if (pdata->gpio_charge_finished >= 0) {
378                 if (device_may_wakeup(&pdev->dev))
379                         enable_irq_wake(
380                                 gpio_to_irq(pdata->gpio_charge_finished));
381                 else {
382                         disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
383                         main_bat.pdata->disable_charger();
384                 }
385         }
386
387         return 0;
388 }
389
390 static int s3c_adc_bat_resume(struct platform_device *pdev)
391 {
392         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
393
394         if (pdata->gpio_charge_finished >= 0) {
395                 if (device_may_wakeup(&pdev->dev))
396                         disable_irq_wake(
397                                 gpio_to_irq(pdata->gpio_charge_finished));
398                 else
399                         enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
400         }
401
402         /* Schedule timer to check current status */
403         schedule_delayed_work(&bat_work,
404                 msecs_to_jiffies(JITTER_DELAY));
405
406         return 0;
407 }
408 #else
409 #define s3c_adc_bat_suspend NULL
410 #define s3c_adc_bat_resume NULL
411 #endif
412
413 static struct platform_driver s3c_adc_bat_driver = {
414         .driver         = {
415                 .name   = "s3c-adc-battery",
416         },
417         .probe          = s3c_adc_bat_probe,
418         .remove         = s3c_adc_bat_remove,
419         .suspend        = s3c_adc_bat_suspend,
420         .resume         = s3c_adc_bat_resume,
421 };
422
423 static int __init s3c_adc_bat_init(void)
424 {
425         return platform_driver_register(&s3c_adc_bat_driver);
426 }
427 module_init(s3c_adc_bat_init);
428
429 static void __exit s3c_adc_bat_exit(void)
430 {
431         platform_driver_unregister(&s3c_adc_bat_driver);
432 }
433 module_exit(s3c_adc_bat_exit);
434
435 MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
436 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
437 MODULE_LICENSE("GPL");