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s3c_adc_battery.c
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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 = 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 
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 = 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 
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 
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 
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 
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
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 
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 <[email protected]>");
446 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
447 MODULE_LICENSE("GPL");
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