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 <linux/soc/samsung/s3c-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 = 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
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 = 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
s3c_adc_bat_work(struct work_struct * work)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
s3c_adc_bat_charged(int irq,void * dev_id)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
s3c_adc_bat_probe(struct platform_device * pdev)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 struct power_supply_config psy_cfg = {};
297 int ret;
298
299 client = s3c_adc_register(pdev, NULL, NULL, 0);
300 if (IS_ERR(client)) {
301 dev_err(&pdev->dev, "cannot register adc\n");
302 return PTR_ERR(client);
303 }
304
305 platform_set_drvdata(pdev, client);
306
307 main_bat.client = client;
308 main_bat.pdata = pdata;
309 main_bat.volt_value = -1;
310 main_bat.cur_value = -1;
311 main_bat.cable_plugged = 0;
312 main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
313 psy_cfg.drv_data = &main_bat;
314
315 main_bat.psy = power_supply_register(&pdev->dev, &main_bat_desc, &psy_cfg);
316 if (IS_ERR(main_bat.psy)) {
317 ret = PTR_ERR(main_bat.psy);
318 goto err_reg_main;
319 }
320 if (pdata->backup_volt_mult) {
321 const struct power_supply_config backup_psy_cfg
322 = { .drv_data = &backup_bat, };
323
324 backup_bat.client = client;
325 backup_bat.pdata = pdev->dev.platform_data;
326 backup_bat.volt_value = -1;
327 backup_bat.psy = power_supply_register(&pdev->dev,
328 &backup_bat_desc,
329 &backup_psy_cfg);
330 if (IS_ERR(backup_bat.psy)) {
331 ret = PTR_ERR(backup_bat.psy);
332 goto err_reg_backup;
333 }
334 }
335
336 INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
337
338 if (pdata->gpio_charge_finished >= 0) {
339 ret = gpio_request(pdata->gpio_charge_finished, "charged");
340 if (ret)
341 goto err_gpio;
342
343 ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
344 s3c_adc_bat_charged,
345 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
346 "battery charged", NULL);
347 if (ret)
348 goto err_irq;
349 }
350
351 if (pdata->init) {
352 ret = pdata->init();
353 if (ret)
354 goto err_platform;
355 }
356
357 dev_info(&pdev->dev, "successfully loaded\n");
358 device_init_wakeup(&pdev->dev, 1);
359
360 /* Schedule timer to check current status */
361 schedule_delayed_work(&bat_work,
362 msecs_to_jiffies(JITTER_DELAY));
363
364 return 0;
365
366 err_platform:
367 if (pdata->gpio_charge_finished >= 0)
368 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
369 err_irq:
370 if (pdata->gpio_charge_finished >= 0)
371 gpio_free(pdata->gpio_charge_finished);
372 err_gpio:
373 if (pdata->backup_volt_mult)
374 power_supply_unregister(backup_bat.psy);
375 err_reg_backup:
376 power_supply_unregister(main_bat.psy);
377 err_reg_main:
378 return ret;
379 }
380
s3c_adc_bat_remove(struct platform_device * pdev)381 static int s3c_adc_bat_remove(struct platform_device *pdev)
382 {
383 struct s3c_adc_client *client = platform_get_drvdata(pdev);
384 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
385
386 power_supply_unregister(main_bat.psy);
387 if (pdata->backup_volt_mult)
388 power_supply_unregister(backup_bat.psy);
389
390 s3c_adc_release(client);
391
392 if (pdata->gpio_charge_finished >= 0) {
393 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
394 gpio_free(pdata->gpio_charge_finished);
395 }
396
397 cancel_delayed_work_sync(&bat_work);
398
399 if (pdata->exit)
400 pdata->exit();
401
402 return 0;
403 }
404
405 #ifdef CONFIG_PM
s3c_adc_bat_suspend(struct platform_device * pdev,pm_message_t state)406 static int s3c_adc_bat_suspend(struct platform_device *pdev,
407 pm_message_t state)
408 {
409 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
410
411 if (pdata->gpio_charge_finished >= 0) {
412 if (device_may_wakeup(&pdev->dev))
413 enable_irq_wake(
414 gpio_to_irq(pdata->gpio_charge_finished));
415 else {
416 disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
417 main_bat.pdata->disable_charger();
418 }
419 }
420
421 return 0;
422 }
423
s3c_adc_bat_resume(struct platform_device * pdev)424 static int s3c_adc_bat_resume(struct platform_device *pdev)
425 {
426 struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
427
428 if (pdata->gpio_charge_finished >= 0) {
429 if (device_may_wakeup(&pdev->dev))
430 disable_irq_wake(
431 gpio_to_irq(pdata->gpio_charge_finished));
432 else
433 enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
434 }
435
436 /* Schedule timer to check current status */
437 schedule_delayed_work(&bat_work,
438 msecs_to_jiffies(JITTER_DELAY));
439
440 return 0;
441 }
442 #else
443 #define s3c_adc_bat_suspend NULL
444 #define s3c_adc_bat_resume NULL
445 #endif
446
447 static struct platform_driver s3c_adc_bat_driver = {
448 .driver = {
449 .name = "s3c-adc-battery",
450 },
451 .probe = s3c_adc_bat_probe,
452 .remove = s3c_adc_bat_remove,
453 .suspend = s3c_adc_bat_suspend,
454 .resume = s3c_adc_bat_resume,
455 };
456
457 module_platform_driver(s3c_adc_bat_driver);
458
459 MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
460 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
461 MODULE_LICENSE("GPL");
462