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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
27#define JITTER_DELAY 500
28
29struct 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
41static struct delayed_work bat_work;
42
43static 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
49static 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
55static 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
90static 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
101static 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
110static int calc_full_volt(int volt_val, int cur_val, int impedance)
111{
112 return volt_val + cur_val * impedance / 1000;
113}
114
115static 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
122static 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
212static 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
224static 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
262static 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
269static int __init 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
327 schedule_delayed_work(&bat_work,
328 msecs_to_jiffies(JITTER_DELAY));
329
330 return 0;
331
332err_platform:
333 if (pdata->gpio_charge_finished >= 0)
334 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
335err_irq:
336 if (pdata->gpio_charge_finished >= 0)
337 gpio_free(pdata->gpio_charge_finished);
338err_gpio:
339 if (pdata->backup_volt_mult)
340 power_supply_unregister(&backup_bat.psy);
341err_reg_backup:
342 power_supply_unregister(&main_bat.psy);
343err_reg_main:
344 return ret;
345}
346
347static 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
372static 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
390static 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
403 schedule_delayed_work(&bat_work,
404 msecs_to_jiffies(JITTER_DELAY));
405
406 return 0;
407}
408#else
409#define s3c_adc_battery_suspend NULL
410#define s3c_adc_battery_resume NULL
411#endif
412
413static 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
423static int __init s3c_adc_bat_init(void)
424{
425 return platform_driver_register(&s3c_adc_bat_driver);
426}
427module_init(s3c_adc_bat_init);
428
429static void __exit s3c_adc_bat_exit(void)
430{
431 platform_driver_unregister(&s3c_adc_bat_driver);
432}
433module_exit(s3c_adc_bat_exit);
434
435MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
436MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
437MODULE_LICENSE("GPL");
438
