Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/power/lp8788-charger.c

  1 /*
  2  * TI LP8788 MFD - battery charger driver
  3  *
  4  * Copyright 2012 Texas Instruments
  5  *
  6  * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  *
 12  */
 13 
 14 #include <linux/err.h>
 15 #include <linux/iio/consumer.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/irqdomain.h>
 18 #include <linux/mfd/lp8788.h>
 19 #include <linux/module.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/power_supply.h>
 22 #include <linux/slab.h>
 23 #include <linux/workqueue.h>
 24 
 25 /* register address */
 26 #define LP8788_CHG_STATUS               0x07
 27 #define LP8788_CHG_IDCIN                0x13
 28 #define LP8788_CHG_IBATT                0x14
 29 #define LP8788_CHG_VTERM                0x15
 30 #define LP8788_CHG_EOC                  0x16
 31 
 32 /* mask/shift bits */
 33 #define LP8788_CHG_INPUT_STATE_M        0x03    /* Addr 07h */
 34 #define LP8788_CHG_STATE_M              0x3C
 35 #define LP8788_CHG_STATE_S              2
 36 #define LP8788_NO_BATT_M                BIT(6)
 37 #define LP8788_BAD_BATT_M               BIT(7)
 38 #define LP8788_CHG_IBATT_M              0x1F    /* Addr 14h */
 39 #define LP8788_CHG_VTERM_M              0x0F    /* Addr 15h */
 40 #define LP8788_CHG_EOC_LEVEL_M          0x30    /* Addr 16h */
 41 #define LP8788_CHG_EOC_LEVEL_S          4
 42 #define LP8788_CHG_EOC_TIME_M           0x0E
 43 #define LP8788_CHG_EOC_TIME_S           1
 44 #define LP8788_CHG_EOC_MODE_M           BIT(0)
 45 
 46 #define LP8788_CHARGER_NAME             "charger"
 47 #define LP8788_BATTERY_NAME             "main_batt"
 48 
 49 #define LP8788_CHG_START                0x11
 50 #define LP8788_CHG_END                  0x1C
 51 
 52 #define LP8788_ISEL_MAX                 23
 53 #define LP8788_ISEL_STEP                50
 54 #define LP8788_VTERM_MIN                4100
 55 #define LP8788_VTERM_STEP               25
 56 #define LP8788_MAX_BATT_CAPACITY        100
 57 #define LP8788_MAX_CHG_IRQS             11
 58 
 59 enum lp8788_charging_state {
 60         LP8788_OFF,
 61         LP8788_WARM_UP,
 62         LP8788_LOW_INPUT = 0x3,
 63         LP8788_PRECHARGE,
 64         LP8788_CC,
 65         LP8788_CV,
 66         LP8788_MAINTENANCE,
 67         LP8788_BATTERY_FAULT,
 68         LP8788_SYSTEM_SUPPORT = 0xC,
 69         LP8788_HIGH_CURRENT = 0xF,
 70         LP8788_MAX_CHG_STATE,
 71 };
 72 
 73 enum lp8788_charger_adc_sel {
 74         LP8788_VBATT,
 75         LP8788_BATT_TEMP,
 76         LP8788_NUM_CHG_ADC,
 77 };
 78 
 79 enum lp8788_charger_input_state {
 80         LP8788_SYSTEM_SUPPLY = 1,
 81         LP8788_FULL_FUNCTION,
 82 };
 83 
 84 /*
 85  * struct lp8788_chg_irq
 86  * @which        : lp8788 interrupt id
 87  * @virq         : Linux IRQ number from irq_domain
 88  */
 89 struct lp8788_chg_irq {
 90         enum lp8788_int_id which;
 91         int virq;
 92 };
 93 
 94 /*
 95  * struct lp8788_charger
 96  * @lp           : used for accessing the registers of mfd lp8788 device
 97  * @charger      : power supply driver for the battery charger
 98  * @battery      : power supply driver for the battery
 99  * @charger_work : work queue for charger input interrupts
100  * @chan         : iio channels for getting adc values
101  *                 eg) battery voltage, capacity and temperature
102  * @irqs         : charger dedicated interrupts
103  * @num_irqs     : total numbers of charger interrupts
104  * @pdata        : charger platform specific data
105  */
106 struct lp8788_charger {
107         struct lp8788 *lp;
108         struct power_supply charger;
109         struct power_supply battery;
110         struct work_struct charger_work;
111         struct iio_channel *chan[LP8788_NUM_CHG_ADC];
112         struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
113         int num_irqs;
114         struct lp8788_charger_platform_data *pdata;
115 };
116 
117 static char *battery_supplied_to[] = {
118         LP8788_BATTERY_NAME,
119 };
120 
121 static enum power_supply_property lp8788_charger_prop[] = {
122         POWER_SUPPLY_PROP_ONLINE,
123         POWER_SUPPLY_PROP_CURRENT_MAX,
124 };
125 
126 static enum power_supply_property lp8788_battery_prop[] = {
127         POWER_SUPPLY_PROP_STATUS,
128         POWER_SUPPLY_PROP_HEALTH,
129         POWER_SUPPLY_PROP_PRESENT,
130         POWER_SUPPLY_PROP_VOLTAGE_NOW,
131         POWER_SUPPLY_PROP_CAPACITY,
132         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
133         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
134         POWER_SUPPLY_PROP_TEMP,
135 };
136 
137 static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
138 {
139         u8 data;
140 
141         lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
142         data &= LP8788_CHG_INPUT_STATE_M;
143 
144         return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION;
145 }
146 
147 static int lp8788_charger_get_property(struct power_supply *psy,
148                                         enum power_supply_property psp,
149                                         union power_supply_propval *val)
150 {
151         struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
152         u8 read;
153 
154         switch (psp) {
155         case POWER_SUPPLY_PROP_ONLINE:
156                 val->intval = lp8788_is_charger_detected(pchg);
157                 break;
158         case POWER_SUPPLY_PROP_CURRENT_MAX:
159                 lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
160                 val->intval = LP8788_ISEL_STEP *
161                                 (min_t(int, read, LP8788_ISEL_MAX) + 1);
162                 break;
163         default:
164                 return -EINVAL;
165         }
166 
167         return 0;
168 }
169 
170 static int lp8788_get_battery_status(struct lp8788_charger *pchg,
171                                 union power_supply_propval *val)
172 {
173         enum lp8788_charging_state state;
174         u8 data;
175         int ret;
176 
177         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
178         if (ret)
179                 return ret;
180 
181         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
182         switch (state) {
183         case LP8788_OFF:
184                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
185                 break;
186         case LP8788_PRECHARGE:
187         case LP8788_CC:
188         case LP8788_CV:
189         case LP8788_HIGH_CURRENT:
190                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
191                 break;
192         case LP8788_MAINTENANCE:
193                 val->intval = POWER_SUPPLY_STATUS_FULL;
194                 break;
195         default:
196                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
197                 break;
198         }
199 
200         return 0;
201 }
202 
203 static int lp8788_get_battery_health(struct lp8788_charger *pchg,
204                                 union power_supply_propval *val)
205 {
206         u8 data;
207         int ret;
208 
209         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
210         if (ret)
211                 return ret;
212 
213         if (data & LP8788_NO_BATT_M)
214                 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
215         else if (data & LP8788_BAD_BATT_M)
216                 val->intval = POWER_SUPPLY_HEALTH_DEAD;
217         else
218                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
219 
220         return 0;
221 }
222 
223 static int lp8788_get_battery_present(struct lp8788_charger *pchg,
224                                 union power_supply_propval *val)
225 {
226         u8 data;
227         int ret;
228 
229         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
230         if (ret)
231                 return ret;
232 
233         val->intval = !(data & LP8788_NO_BATT_M);
234         return 0;
235 }
236 
237 static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg, int *result)
238 {
239         struct iio_channel *channel = pchg->chan[LP8788_VBATT];
240 
241         if (!channel)
242                 return -EINVAL;
243 
244         return iio_read_channel_processed(channel, result);
245 }
246 
247 static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
248                                 union power_supply_propval *val)
249 {
250         return lp8788_get_vbatt_adc(pchg, &val->intval);
251 }
252 
253 static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
254                                 union power_supply_propval *val)
255 {
256         struct lp8788 *lp = pchg->lp;
257         struct lp8788_charger_platform_data *pdata = pchg->pdata;
258         unsigned int max_vbatt;
259         int vbatt;
260         enum lp8788_charging_state state;
261         u8 data;
262         int ret;
263 
264         if (!pdata)
265                 return -EINVAL;
266 
267         max_vbatt = pdata->max_vbatt_mv;
268         if (max_vbatt == 0)
269                 return -EINVAL;
270 
271         ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
272         if (ret)
273                 return ret;
274 
275         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
276 
277         if (state == LP8788_MAINTENANCE) {
278                 val->intval = LP8788_MAX_BATT_CAPACITY;
279         } else {
280                 ret = lp8788_get_vbatt_adc(pchg, &vbatt);
281                 if (ret)
282                         return ret;
283 
284                 val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
285                 val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
286         }
287 
288         return 0;
289 }
290 
291 static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
292                                 union power_supply_propval *val)
293 {
294         struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
295         int result;
296         int ret;
297 
298         if (!channel)
299                 return -EINVAL;
300 
301         ret = iio_read_channel_processed(channel, &result);
302         if (ret < 0)
303                 return -EINVAL;
304 
305         /* unit: 0.1 'C */
306         val->intval = result * 10;
307 
308         return 0;
309 }
310 
311 static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
312                                 union power_supply_propval *val)
313 {
314         u8 read;
315 
316         lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
317         read &= LP8788_CHG_IBATT_M;
318         val->intval = LP8788_ISEL_STEP *
319                         (min_t(int, read, LP8788_ISEL_MAX) + 1);
320 
321         return 0;
322 }
323 
324 static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
325                                 union power_supply_propval *val)
326 {
327         u8 read;
328 
329         lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
330         read &= LP8788_CHG_VTERM_M;
331         val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
332 
333         return 0;
334 }
335 
336 static int lp8788_battery_get_property(struct power_supply *psy,
337                                         enum power_supply_property psp,
338                                         union power_supply_propval *val)
339 {
340         struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
341 
342         switch (psp) {
343         case POWER_SUPPLY_PROP_STATUS:
344                 return lp8788_get_battery_status(pchg, val);
345         case POWER_SUPPLY_PROP_HEALTH:
346                 return lp8788_get_battery_health(pchg, val);
347         case POWER_SUPPLY_PROP_PRESENT:
348                 return lp8788_get_battery_present(pchg, val);
349         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
350                 return lp8788_get_battery_voltage(pchg, val);
351         case POWER_SUPPLY_PROP_CAPACITY:
352                 return lp8788_get_battery_capacity(pchg, val);
353         case POWER_SUPPLY_PROP_TEMP:
354                 return lp8788_get_battery_temperature(pchg, val);
355         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
356                 return lp8788_get_battery_charging_current(pchg, val);
357         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
358                 return lp8788_get_charging_termination_voltage(pchg, val);
359         default:
360                 return -EINVAL;
361         }
362 }
363 
364 static inline bool lp8788_is_valid_charger_register(u8 addr)
365 {
366         return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
367 }
368 
369 static int lp8788_update_charger_params(struct platform_device *pdev,
370                                         struct lp8788_charger *pchg)
371 {
372         struct lp8788 *lp = pchg->lp;
373         struct lp8788_charger_platform_data *pdata = pchg->pdata;
374         struct lp8788_chg_param *param;
375         int i;
376         int ret;
377 
378         if (!pdata || !pdata->chg_params) {
379                 dev_info(&pdev->dev, "skip updating charger parameters\n");
380                 return 0;
381         }
382 
383         /* settting charging parameters */
384         for (i = 0; i < pdata->num_chg_params; i++) {
385                 param = pdata->chg_params + i;
386 
387                 if (!param)
388                         continue;
389 
390                 if (lp8788_is_valid_charger_register(param->addr)) {
391                         ret = lp8788_write_byte(lp, param->addr, param->val);
392                         if (ret)
393                                 return ret;
394                 }
395         }
396 
397         return 0;
398 }
399 
400 static int lp8788_psy_register(struct platform_device *pdev,
401                                 struct lp8788_charger *pchg)
402 {
403         pchg->charger.name = LP8788_CHARGER_NAME;
404         pchg->charger.type = POWER_SUPPLY_TYPE_MAINS;
405         pchg->charger.properties = lp8788_charger_prop;
406         pchg->charger.num_properties = ARRAY_SIZE(lp8788_charger_prop);
407         pchg->charger.get_property = lp8788_charger_get_property;
408         pchg->charger.supplied_to = battery_supplied_to;
409         pchg->charger.num_supplicants = ARRAY_SIZE(battery_supplied_to);
410 
411         if (power_supply_register(&pdev->dev, &pchg->charger))
412                 return -EPERM;
413 
414         pchg->battery.name = LP8788_BATTERY_NAME;
415         pchg->battery.type = POWER_SUPPLY_TYPE_BATTERY;
416         pchg->battery.properties = lp8788_battery_prop;
417         pchg->battery.num_properties = ARRAY_SIZE(lp8788_battery_prop);
418         pchg->battery.get_property = lp8788_battery_get_property;
419 
420         if (power_supply_register(&pdev->dev, &pchg->battery))
421                 return -EPERM;
422 
423         return 0;
424 }
425 
426 static void lp8788_psy_unregister(struct lp8788_charger *pchg)
427 {
428         power_supply_unregister(&pchg->battery);
429         power_supply_unregister(&pchg->charger);
430 }
431 
432 static void lp8788_charger_event(struct work_struct *work)
433 {
434         struct lp8788_charger *pchg =
435                 container_of(work, struct lp8788_charger, charger_work);
436         struct lp8788_charger_platform_data *pdata = pchg->pdata;
437         enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
438 
439         pdata->charger_event(pchg->lp, event);
440 }
441 
442 static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
443 {
444         bool found;
445         int i;
446 
447         for (i = 0; i < pchg->num_irqs; i++) {
448                 if (pchg->irqs[i].virq == virq) {
449                         *id = pchg->irqs[i].which;
450                         found = true;
451                         break;
452                 }
453         }
454 
455         return found;
456 }
457 
458 static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
459 {
460         struct lp8788_charger *pchg = ptr;
461         struct lp8788_charger_platform_data *pdata = pchg->pdata;
462         int id = -1;
463 
464         if (!lp8788_find_irq_id(pchg, virq, &id))
465                 return IRQ_NONE;
466 
467         switch (id) {
468         case LP8788_INT_CHG_INPUT_STATE:
469         case LP8788_INT_CHG_STATE:
470         case LP8788_INT_EOC:
471         case LP8788_INT_BATT_LOW:
472         case LP8788_INT_NO_BATT:
473                 power_supply_changed(&pchg->charger);
474                 power_supply_changed(&pchg->battery);
475                 break;
476         default:
477                 break;
478         }
479 
480         /* report charger dectection event if used */
481         if (!pdata)
482                 goto irq_handled;
483 
484         if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
485                 schedule_work(&pchg->charger_work);
486 
487 irq_handled:
488         return IRQ_HANDLED;
489 }
490 
491 static int lp8788_set_irqs(struct platform_device *pdev,
492                         struct lp8788_charger *pchg, const char *name)
493 {
494         struct resource *r;
495         struct irq_domain *irqdm = pchg->lp->irqdm;
496         int irq_start;
497         int irq_end;
498         int virq;
499         int nr_irq;
500         int i;
501         int ret;
502 
503         /* no error even if no irq resource */
504         r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
505         if (!r)
506                 return 0;
507 
508         irq_start = r->start;
509         irq_end = r->end;
510 
511         for (i = irq_start; i <= irq_end; i++) {
512                 nr_irq = pchg->num_irqs;
513 
514                 virq = irq_create_mapping(irqdm, i);
515                 pchg->irqs[nr_irq].virq = virq;
516                 pchg->irqs[nr_irq].which = i;
517                 pchg->num_irqs++;
518 
519                 ret = request_threaded_irq(virq, NULL,
520                                         lp8788_charger_irq_thread,
521                                         0, name, pchg);
522                 if (ret)
523                         break;
524         }
525 
526         if (i <= irq_end)
527                 goto err_free_irq;
528 
529         return 0;
530 
531 err_free_irq:
532         for (i = 0; i < pchg->num_irqs; i++)
533                 free_irq(pchg->irqs[i].virq, pchg);
534         return ret;
535 }
536 
537 static int lp8788_irq_register(struct platform_device *pdev,
538                                 struct lp8788_charger *pchg)
539 {
540         const char *name[] = {
541                 LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
542         };
543         int i;
544         int ret;
545 
546         INIT_WORK(&pchg->charger_work, lp8788_charger_event);
547         pchg->num_irqs = 0;
548 
549         for (i = 0; i < ARRAY_SIZE(name); i++) {
550                 ret = lp8788_set_irqs(pdev, pchg, name[i]);
551                 if (ret) {
552                         dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]);
553                         return ret;
554                 }
555         }
556 
557         if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
558                 dev_err(&pdev->dev, "invalid total number of irqs: %d\n",
559                         pchg->num_irqs);
560                 return -EINVAL;
561         }
562 
563 
564         return 0;
565 }
566 
567 static void lp8788_irq_unregister(struct platform_device *pdev,
568                                   struct lp8788_charger *pchg)
569 {
570         int i;
571         int irq;
572 
573         for (i = 0; i < pchg->num_irqs; i++) {
574                 irq = pchg->irqs[i].virq;
575                 if (!irq)
576                         continue;
577 
578                 free_irq(irq, pchg);
579         }
580 }
581 
582 static void lp8788_setup_adc_channel(struct device *dev,
583                                 struct lp8788_charger *pchg)
584 {
585         struct lp8788_charger_platform_data *pdata = pchg->pdata;
586         struct iio_channel *chan;
587 
588         if (!pdata)
589                 return;
590 
591         /* ADC channel for battery voltage */
592         chan = iio_channel_get(dev, pdata->adc_vbatt);
593         pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
594 
595         /* ADC channel for battery temperature */
596         chan = iio_channel_get(dev, pdata->adc_batt_temp);
597         pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
598 }
599 
600 static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
601 {
602         int i;
603 
604         for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
605                 if (!pchg->chan[i])
606                         continue;
607 
608                 iio_channel_release(pchg->chan[i]);
609                 pchg->chan[i] = NULL;
610         }
611 }
612 
613 static ssize_t lp8788_show_charger_status(struct device *dev,
614                                 struct device_attribute *attr, char *buf)
615 {
616         struct lp8788_charger *pchg = dev_get_drvdata(dev);
617         enum lp8788_charging_state state;
618         char *desc[LP8788_MAX_CHG_STATE] = {
619                 [LP8788_OFF] = "CHARGER OFF",
620                 [LP8788_WARM_UP] = "WARM UP",
621                 [LP8788_LOW_INPUT] = "LOW INPUT STATE",
622                 [LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
623                 [LP8788_CC] = "CHARGING - CC",
624                 [LP8788_CV] = "CHARGING - CV",
625                 [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
626                 [LP8788_BATTERY_FAULT] = "BATTERY FAULT",
627                 [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
628                 [LP8788_HIGH_CURRENT] = "HIGH CURRENT",
629         };
630         u8 data;
631 
632         lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
633         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
634 
635         return scnprintf(buf, PAGE_SIZE, "%s\n", desc[state]);
636 }
637 
638 static ssize_t lp8788_show_eoc_time(struct device *dev,
639                                 struct device_attribute *attr, char *buf)
640 {
641         struct lp8788_charger *pchg = dev_get_drvdata(dev);
642         char *stime[] = { "400ms", "5min", "10min", "15min",
643                         "20min", "25min", "30min" "No timeout" };
644         u8 val;
645 
646         lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
647         val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
648 
649         return scnprintf(buf, PAGE_SIZE, "End Of Charge Time: %s\n",
650                         stime[val]);
651 }
652 
653 static ssize_t lp8788_show_eoc_level(struct device *dev,
654                                 struct device_attribute *attr, char *buf)
655 {
656         struct lp8788_charger *pchg = dev_get_drvdata(dev);
657         char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
658         char *relative_level[] = { "5%", "10%", "15%", "20%" };
659         char *level;
660         u8 val;
661         u8 mode;
662 
663         lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
664 
665         mode = val & LP8788_CHG_EOC_MODE_M;
666         val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
667         level = mode ? abs_level[val] : relative_level[val];
668 
669         return scnprintf(buf, PAGE_SIZE, "End Of Charge Level: %s\n", level);
670 }
671 
672 static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
673 static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
674 static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
675 
676 static struct attribute *lp8788_charger_attr[] = {
677         &dev_attr_charger_status.attr,
678         &dev_attr_eoc_time.attr,
679         &dev_attr_eoc_level.attr,
680         NULL,
681 };
682 
683 static const struct attribute_group lp8788_attr_group = {
684         .attrs = lp8788_charger_attr,
685 };
686 
687 static int lp8788_charger_probe(struct platform_device *pdev)
688 {
689         struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
690         struct lp8788_charger *pchg;
691         struct device *dev = &pdev->dev;
692         int ret;
693 
694         pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL);
695         if (!pchg)
696                 return -ENOMEM;
697 
698         pchg->lp = lp;
699         pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
700         platform_set_drvdata(pdev, pchg);
701 
702         ret = lp8788_update_charger_params(pdev, pchg);
703         if (ret)
704                 return ret;
705 
706         lp8788_setup_adc_channel(&pdev->dev, pchg);
707 
708         ret = lp8788_psy_register(pdev, pchg);
709         if (ret)
710                 return ret;
711 
712         ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
713         if (ret) {
714                 lp8788_psy_unregister(pchg);
715                 return ret;
716         }
717 
718         ret = lp8788_irq_register(pdev, pchg);
719         if (ret)
720                 dev_warn(dev, "failed to register charger irq: %d\n", ret);
721 
722         return 0;
723 }
724 
725 static int lp8788_charger_remove(struct platform_device *pdev)
726 {
727         struct lp8788_charger *pchg = platform_get_drvdata(pdev);
728 
729         flush_work(&pchg->charger_work);
730         lp8788_irq_unregister(pdev, pchg);
731         sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
732         lp8788_psy_unregister(pchg);
733         lp8788_release_adc_channel(pchg);
734 
735         return 0;
736 }
737 
738 static struct platform_driver lp8788_charger_driver = {
739         .probe = lp8788_charger_probe,
740         .remove = lp8788_charger_remove,
741         .driver = {
742                 .name = LP8788_DEV_CHARGER,
743                 .owner = THIS_MODULE,
744         },
745 };
746 module_platform_driver(lp8788_charger_driver);
747 
748 MODULE_DESCRIPTION("TI LP8788 Charger Driver");
749 MODULE_AUTHOR("Milo Kim");
750 MODULE_LICENSE("GPL");
751 MODULE_ALIAS("platform:lp8788-charger");
752 

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