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
s3c_adc_bat_ext_power_changed(struct power_supply * psy)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
gather_samples(struct s3c_adc_client * client,int num,int channel)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
s3c_adc_backup_bat_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)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 = container_of(psy, struct s3c_adc_bat, 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 struct s3c_adc_bat backup_bat = {
109 .psy = {
110 .name = "backup-battery",
111 .type = POWER_SUPPLY_TYPE_BATTERY,
112 .properties = s3c_adc_backup_bat_props,
113 .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
114 .get_property = s3c_adc_backup_bat_get_property,
115 .use_for_apm = 1,
116 },
117 };
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
calc_full_volt(int volt_val,int cur_val,int impedance)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
charge_finished(struct s3c_adc_bat * bat)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
s3c_adc_bat_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)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 = container_of(psy, struct s3c_adc_bat, psy);
145
146 int new_level;
147 int full_volt;
148 const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac;
149 unsigned int lut_size = bat->pdata->lut_noac_cnt;
150
151 if (!bat) {
152 dev_err(psy->dev, "no battery infos ?!\n");
153 return -EINVAL;
154 }
155
156 if (bat->volt_value < 0 || bat->cur_value < 0 ||
157 jiffies_to_msecs(jiffies - bat->timestamp) >
158 BAT_POLL_INTERVAL) {
159 bat->volt_value = gather_samples(bat->client,
160 bat->pdata->volt_samples,
161 bat->pdata->volt_channel) * bat->pdata->volt_mult;
162 bat->cur_value = gather_samples(bat->client,
163 bat->pdata->current_samples,
164 bat->pdata->current_channel) * bat->pdata->current_mult;
165 bat->timestamp = jiffies;
166 }
167
168 if (bat->cable_plugged &&
169 ((bat->pdata->gpio_charge_finished < 0) ||
170 !charge_finished(bat))) {
171 lut = bat->pdata->lut_acin;
172 lut_size = bat->pdata->lut_acin_cnt;
173 }
174
175 new_level = 100000;
176 full_volt = calc_full_volt((bat->volt_value / 1000),
177 (bat->cur_value / 1000), bat->pdata->internal_impedance);
178
179 if (full_volt < calc_full_volt(lut->volt, lut->cur,
180 bat->pdata->internal_impedance)) {
181 lut_size--;
182 while (lut_size--) {
183 int lut_volt1;
184 int lut_volt2;
185
186 lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
187 bat->pdata->internal_impedance);
188 lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
189 bat->pdata->internal_impedance);
190 if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
191 new_level = (lut[1].level +
192 (lut[0].level - lut[1].level) *
193 (full_volt - lut_volt2) /
194 (lut_volt1 - lut_volt2)) * 1000;
195 break;
196 }
197 new_level = lut[1].level * 1000;
198 lut++;
199 }
200 }
201
202 bat->level = new_level;
203
204 switch (psp) {
205 case POWER_SUPPLY_PROP_STATUS:
206 if (bat->pdata->gpio_charge_finished < 0)
207 val->intval = bat->level == 100000 ?
208 POWER_SUPPLY_STATUS_FULL : bat->status;
209 else
210 val->intval = bat->status;
211 return 0;
212 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
213 val->intval = 100000;
214 return 0;
215 case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
216 val->intval = 0;
217 return 0;
218 case POWER_SUPPLY_PROP_CHARGE_NOW:
219 val->intval = bat->level;
220 return 0;
221 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
222 val->intval = bat->volt_value;
223 return 0;
224 case POWER_SUPPLY_PROP_CURRENT_NOW:
225 val->intval = bat->cur_value;
226 return 0;
227 default:
228 return -EINVAL;
229 }
230 }
231
232 static struct s3c_adc_bat main_bat = {
233 .psy = {
234 .name = "main-battery",
235 .type = POWER_SUPPLY_TYPE_BATTERY,
236 .properties = s3c_adc_main_bat_props,
237 .num_properties = ARRAY_SIZE(s3c_adc_main_bat_props),
238 .get_property = s3c_adc_bat_get_property,
239 .external_power_changed = s3c_adc_bat_ext_power_changed,
240 .use_for_apm = 1,
241 },
242 };
243
s3c_adc_bat_work(struct work_struct * work)244 static void s3c_adc_bat_work(struct work_struct *work)
245 {
246 struct s3c_adc_bat *bat = &main_bat;
247 int is_charged;
248 int is_plugged;
249 static int was_plugged;
250
251 is_plugged = power_supply_am_i_supplied(&bat->psy);
252 bat->cable_plugged = is_plugged;
253 if (is_plugged != was_plugged) {
254 was_plugged = is_plugged;
255 if (is_plugged) {
256 if (bat->pdata->enable_charger)
257 bat->pdata->enable_charger();
258 bat->status = POWER_SUPPLY_STATUS_CHARGING;
259 } else {
260 if (bat->pdata->disable_charger)
261 bat->pdata->disable_charger();
262 bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
263 }
264 } else {
265 if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
266 is_charged = charge_finished(&main_bat);
267 if (is_charged) {
268 if (bat->pdata->disable_charger)
269 bat->pdata->disable_charger();
270 bat->status = POWER_SUPPLY_STATUS_FULL;
271 } else {
272 if (bat->pdata->enable_charger)
273 bat->pdata->enable_charger();
274 bat->status = POWER_SUPPLY_STATUS_CHARGING;
275 }
276 }
277 }
278
279 power_supply_changed(&bat->psy);
280 }
281
s3c_adc_bat_charged(int irq,void * dev_id)282 static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
283 {
284 schedule_delayed_work(&bat_work,
285 msecs_to_jiffies(JITTER_DELAY));
286 return IRQ_HANDLED;
287 }
288
s3c_adc_bat_probe(struct platform_device * pdev)289 static int __devinit s3c_adc_bat_probe(struct platform_device *pdev)
290 {
291 struct s3c_adc_client *client;
292 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
293 int ret;
294
295 client = s3c_adc_register(pdev, NULL, NULL, 0);
296 if (IS_ERR(client)) {
297 dev_err(&pdev->dev, "cannot register adc\n");
298 return PTR_ERR(client);
299 }
300
301 platform_set_drvdata(pdev, client);
302
303 main_bat.client = client;
304 main_bat.pdata = pdata;
305 main_bat.volt_value = -1;
306 main_bat.cur_value = -1;
307 main_bat.cable_plugged = 0;
308 main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
309
310 ret = power_supply_register(&pdev->dev, &main_bat.psy);
311 if (ret)
312 goto err_reg_main;
313 if (pdata->backup_volt_mult) {
314 backup_bat.client = client;
315 backup_bat.pdata = pdev->dev.platform_data;
316 backup_bat.volt_value = -1;
317 ret = power_supply_register(&pdev->dev, &backup_bat.psy);
318 if (ret)
319 goto err_reg_backup;
320 }
321
322 INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
323
324 if (pdata->gpio_charge_finished >= 0) {
325 ret = gpio_request(pdata->gpio_charge_finished, "charged");
326 if (ret)
327 goto err_gpio;
328
329 ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
330 s3c_adc_bat_charged,
331 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
332 "battery charged", NULL);
333 if (ret)
334 goto err_irq;
335 }
336
337 if (pdata->init) {
338 ret = pdata->init();
339 if (ret)
340 goto err_platform;
341 }
342
343 dev_info(&pdev->dev, "successfully loaded\n");
344 device_init_wakeup(&pdev->dev, 1);
345
346 /* Schedule timer to check current status */
347 schedule_delayed_work(&bat_work,
348 msecs_to_jiffies(JITTER_DELAY));
349
350 return 0;
351
352 err_platform:
353 if (pdata->gpio_charge_finished >= 0)
354 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
355 err_irq:
356 if (pdata->gpio_charge_finished >= 0)
357 gpio_free(pdata->gpio_charge_finished);
358 err_gpio:
359 if (pdata->backup_volt_mult)
360 power_supply_unregister(&backup_bat.psy);
361 err_reg_backup:
362 power_supply_unregister(&main_bat.psy);
363 err_reg_main:
364 return ret;
365 }
366
s3c_adc_bat_remove(struct platform_device * pdev)367 static int s3c_adc_bat_remove(struct platform_device *pdev)
368 {
369 struct s3c_adc_client *client = platform_get_drvdata(pdev);
370 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
371
372 power_supply_unregister(&main_bat.psy);
373 if (pdata->backup_volt_mult)
374 power_supply_unregister(&backup_bat.psy);
375
376 s3c_adc_release(client);
377
378 if (pdata->gpio_charge_finished >= 0) {
379 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
380 gpio_free(pdata->gpio_charge_finished);
381 }
382
383 cancel_delayed_work(&bat_work);
384
385 if (pdata->exit)
386 pdata->exit();
387
388 return 0;
389 }
390
391 #ifdef CONFIG_PM
s3c_adc_bat_suspend(struct platform_device * pdev,pm_message_t state)392 static int s3c_adc_bat_suspend(struct platform_device *pdev,
393 pm_message_t state)
394 {
395 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
396
397 if (pdata->gpio_charge_finished >= 0) {
398 if (device_may_wakeup(&pdev->dev))
399 enable_irq_wake(
400 gpio_to_irq(pdata->gpio_charge_finished));
401 else {
402 disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
403 main_bat.pdata->disable_charger();
404 }
405 }
406
407 return 0;
408 }
409
s3c_adc_bat_resume(struct platform_device * pdev)410 static int s3c_adc_bat_resume(struct platform_device *pdev)
411 {
412 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
413
414 if (pdata->gpio_charge_finished >= 0) {
415 if (device_may_wakeup(&pdev->dev))
416 disable_irq_wake(
417 gpio_to_irq(pdata->gpio_charge_finished));
418 else
419 enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
420 }
421
422 /* Schedule timer to check current status */
423 schedule_delayed_work(&bat_work,
424 msecs_to_jiffies(JITTER_DELAY));
425
426 return 0;
427 }
428 #else
429 #define s3c_adc_bat_suspend NULL
430 #define s3c_adc_bat_resume NULL
431 #endif
432
433 static struct platform_driver s3c_adc_bat_driver = {
434 .driver = {
435 .name = "s3c-adc-battery",
436 },
437 .probe = s3c_adc_bat_probe,
438 .remove = s3c_adc_bat_remove,
439 .suspend = s3c_adc_bat_suspend,
440 .resume = s3c_adc_bat_resume,
441 };
442
443 module_platform_driver(s3c_adc_bat_driver);
444
445 MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
446 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
447 MODULE_LICENSE("GPL");
448