e852d12cd077afa027b5d50be4b5b85ad8b84c0a
[linux-2.6-microblaze.git] / 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_BUF_SIZE                 40
53 #define LP8788_ISEL_MAX                 23
54 #define LP8788_ISEL_STEP                50
55 #define LP8788_VTERM_MIN                4100
56 #define LP8788_VTERM_STEP               25
57 #define LP8788_MAX_BATT_CAPACITY        100
58 #define LP8788_MAX_CHG_IRQS             11
59
60 enum lp8788_charging_state {
61         LP8788_OFF,
62         LP8788_WARM_UP,
63         LP8788_LOW_INPUT = 0x3,
64         LP8788_PRECHARGE,
65         LP8788_CC,
66         LP8788_CV,
67         LP8788_MAINTENANCE,
68         LP8788_BATTERY_FAULT,
69         LP8788_SYSTEM_SUPPORT = 0xC,
70         LP8788_HIGH_CURRENT = 0xF,
71         LP8788_MAX_CHG_STATE,
72 };
73
74 enum lp8788_charger_adc_sel {
75         LP8788_VBATT,
76         LP8788_BATT_TEMP,
77         LP8788_NUM_CHG_ADC,
78 };
79
80 enum lp8788_charger_input_state {
81         LP8788_SYSTEM_SUPPLY = 1,
82         LP8788_FULL_FUNCTION,
83 };
84
85 /*
86  * struct lp8788_chg_irq
87  * @which        : lp8788 interrupt id
88  * @virq         : Linux IRQ number from irq_domain
89  */
90 struct lp8788_chg_irq {
91         enum lp8788_int_id which;
92         int virq;
93 };
94
95 /*
96  * struct lp8788_charger
97  * @lp           : used for accessing the registers of mfd lp8788 device
98  * @charger      : power supply driver for the battery charger
99  * @battery      : power supply driver for the battery
100  * @charger_work : work queue for charger input interrupts
101  * @chan         : iio channels for getting adc values
102  *                 eg) battery voltage, capacity and temperature
103  * @irqs         : charger dedicated interrupts
104  * @num_irqs     : total numbers of charger interrupts
105  * @pdata        : charger platform specific data
106  */
107 struct lp8788_charger {
108         struct lp8788 *lp;
109         struct power_supply charger;
110         struct power_supply battery;
111         struct work_struct charger_work;
112         struct iio_channel *chan[LP8788_NUM_CHG_ADC];
113         struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
114         int num_irqs;
115         struct lp8788_charger_platform_data *pdata;
116 };
117
118 static char *battery_supplied_to[] = {
119         LP8788_BATTERY_NAME,
120 };
121
122 static enum power_supply_property lp8788_charger_prop[] = {
123         POWER_SUPPLY_PROP_ONLINE,
124         POWER_SUPPLY_PROP_CURRENT_MAX,
125 };
126
127 static enum power_supply_property lp8788_battery_prop[] = {
128         POWER_SUPPLY_PROP_STATUS,
129         POWER_SUPPLY_PROP_HEALTH,
130         POWER_SUPPLY_PROP_PRESENT,
131         POWER_SUPPLY_PROP_VOLTAGE_NOW,
132         POWER_SUPPLY_PROP_CAPACITY,
133         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
134         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
135         POWER_SUPPLY_PROP_TEMP,
136 };
137
138 static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
139 {
140         u8 data;
141
142         lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
143         data &= LP8788_CHG_INPUT_STATE_M;
144
145         return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION;
146 }
147
148 static int lp8788_charger_get_property(struct power_supply *psy,
149                                         enum power_supply_property psp,
150                                         union power_supply_propval *val)
151 {
152         struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
153         u8 read;
154
155         switch (psp) {
156         case POWER_SUPPLY_PROP_ONLINE:
157                 val->intval = lp8788_is_charger_detected(pchg);
158                 break;
159         case POWER_SUPPLY_PROP_CURRENT_MAX:
160                 lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
161                 val->intval = LP8788_ISEL_STEP *
162                                 (min_t(int, read, LP8788_ISEL_MAX) + 1);
163                 break;
164         default:
165                 return -EINVAL;
166         }
167
168         return 0;
169 }
170
171 static int lp8788_get_battery_status(struct lp8788_charger *pchg,
172                                 union power_supply_propval *val)
173 {
174         enum lp8788_charging_state state;
175         u8 data;
176         int ret;
177
178         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
179         if (ret)
180                 return ret;
181
182         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
183         switch (state) {
184         case LP8788_OFF:
185                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
186                 break;
187         case LP8788_PRECHARGE:
188         case LP8788_CC:
189         case LP8788_CV:
190         case LP8788_HIGH_CURRENT:
191                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
192                 break;
193         case LP8788_MAINTENANCE:
194                 val->intval = POWER_SUPPLY_STATUS_FULL;
195                 break;
196         default:
197                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
198                 break;
199         }
200
201         return 0;
202 }
203
204 static int lp8788_get_battery_health(struct lp8788_charger *pchg,
205                                 union power_supply_propval *val)
206 {
207         u8 data;
208         int ret;
209
210         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
211         if (ret)
212                 return ret;
213
214         if (data & LP8788_NO_BATT_M)
215                 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
216         else if (data & LP8788_BAD_BATT_M)
217                 val->intval = POWER_SUPPLY_HEALTH_DEAD;
218         else
219                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
220
221         return 0;
222 }
223
224 static int lp8788_get_battery_present(struct lp8788_charger *pchg,
225                                 union power_supply_propval *val)
226 {
227         u8 data;
228         int ret;
229
230         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
231         if (ret)
232                 return ret;
233
234         val->intval = !(data & LP8788_NO_BATT_M);
235         return 0;
236 }
237
238 static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg,
239                                 unsigned int *result)
240 {
241         struct iio_channel *channel = pchg->chan[LP8788_VBATT];
242         int scaleint;
243         int scalepart;
244         int ret;
245
246         if (!channel)
247                 return -EINVAL;
248
249         ret = iio_read_channel_scale(channel, &scaleint, &scalepart);
250         if (ret != IIO_VAL_INT_PLUS_MICRO)
251                 return -EINVAL;
252
253         /* unit: mV */
254         *result = (scaleint + scalepart * 1000000) / 1000;
255
256         return 0;
257 }
258
259 static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
260                                 union power_supply_propval *val)
261 {
262         return lp8788_get_vbatt_adc(pchg, &val->intval);
263 }
264
265 static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
266                                 union power_supply_propval *val)
267 {
268         struct lp8788 *lp = pchg->lp;
269         struct lp8788_charger_platform_data *pdata = pchg->pdata;
270         unsigned int max_vbatt;
271         unsigned int vbatt;
272         enum lp8788_charging_state state;
273         u8 data;
274         int ret;
275
276         if (!pdata)
277                 return -EINVAL;
278
279         max_vbatt = pdata->max_vbatt_mv;
280         if (max_vbatt == 0)
281                 return -EINVAL;
282
283         ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
284         if (ret)
285                 return ret;
286
287         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
288
289         if (state == LP8788_MAINTENANCE) {
290                 val->intval = LP8788_MAX_BATT_CAPACITY;
291         } else {
292                 ret = lp8788_get_vbatt_adc(pchg, &vbatt);
293                 if (ret)
294                         return ret;
295
296                 val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
297                 val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
298         }
299
300         return 0;
301 }
302
303 static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
304                                 union power_supply_propval *val)
305 {
306         struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
307         int scaleint;
308         int scalepart;
309         int ret;
310
311         if (!channel)
312                 return -EINVAL;
313
314         ret = iio_read_channel_scale(channel, &scaleint, &scalepart);
315         if (ret != IIO_VAL_INT_PLUS_MICRO)
316                 return -EINVAL;
317
318         /* unit: 0.1 'C */
319         val->intval = (scaleint + scalepart * 1000000) / 100;
320
321         return 0;
322 }
323
324 static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
325                                 union power_supply_propval *val)
326 {
327         u8 read;
328
329         lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
330         read &= LP8788_CHG_IBATT_M;
331         val->intval = LP8788_ISEL_STEP *
332                         (min_t(int, read, LP8788_ISEL_MAX) + 1);
333
334         return 0;
335 }
336
337 static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
338                                 union power_supply_propval *val)
339 {
340         u8 read;
341
342         lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
343         read &= LP8788_CHG_VTERM_M;
344         val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
345
346         return 0;
347 }
348
349 static int lp8788_battery_get_property(struct power_supply *psy,
350                                         enum power_supply_property psp,
351                                         union power_supply_propval *val)
352 {
353         struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
354
355         switch (psp) {
356         case POWER_SUPPLY_PROP_STATUS:
357                 return lp8788_get_battery_status(pchg, val);
358         case POWER_SUPPLY_PROP_HEALTH:
359                 return lp8788_get_battery_health(pchg, val);
360         case POWER_SUPPLY_PROP_PRESENT:
361                 return lp8788_get_battery_present(pchg, val);
362         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
363                 return lp8788_get_battery_voltage(pchg, val);
364         case POWER_SUPPLY_PROP_CAPACITY:
365                 return lp8788_get_battery_capacity(pchg, val);
366         case POWER_SUPPLY_PROP_TEMP:
367                 return lp8788_get_battery_temperature(pchg, val);
368         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
369                 return lp8788_get_battery_charging_current(pchg, val);
370         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
371                 return lp8788_get_charging_termination_voltage(pchg, val);
372         default:
373                 return -EINVAL;
374         }
375 }
376
377 static inline bool lp8788_is_valid_charger_register(u8 addr)
378 {
379         return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
380 }
381
382 static int lp8788_update_charger_params(struct lp8788_charger *pchg)
383 {
384         struct lp8788 *lp = pchg->lp;
385         struct lp8788_charger_platform_data *pdata = pchg->pdata;
386         struct lp8788_chg_param *param;
387         int i;
388         int ret;
389
390         if (!pdata || !pdata->chg_params) {
391                 dev_info(lp->dev, "skip updating charger parameters\n");
392                 return 0;
393         }
394
395         /* settting charging parameters */
396         for (i = 0; i < pdata->num_chg_params; i++) {
397                 param = pdata->chg_params + i;
398
399                 if (!param)
400                         continue;
401
402                 if (lp8788_is_valid_charger_register(param->addr)) {
403                         ret = lp8788_write_byte(lp, param->addr, param->val);
404                         if (ret)
405                                 return ret;
406                 }
407         }
408
409         return 0;
410 }
411
412 static int lp8788_psy_register(struct platform_device *pdev,
413                                 struct lp8788_charger *pchg)
414 {
415         pchg->charger.name = LP8788_CHARGER_NAME;
416         pchg->charger.type = POWER_SUPPLY_TYPE_MAINS;
417         pchg->charger.properties = lp8788_charger_prop;
418         pchg->charger.num_properties = ARRAY_SIZE(lp8788_charger_prop);
419         pchg->charger.get_property = lp8788_charger_get_property;
420         pchg->charger.supplied_to = battery_supplied_to;
421         pchg->charger.num_supplicants = ARRAY_SIZE(battery_supplied_to);
422
423         if (power_supply_register(&pdev->dev, &pchg->charger))
424                 return -EPERM;
425
426         pchg->battery.name = LP8788_BATTERY_NAME;
427         pchg->battery.type = POWER_SUPPLY_TYPE_BATTERY;
428         pchg->battery.properties = lp8788_battery_prop;
429         pchg->battery.num_properties = ARRAY_SIZE(lp8788_battery_prop);
430         pchg->battery.get_property = lp8788_battery_get_property;
431
432         if (power_supply_register(&pdev->dev, &pchg->battery))
433                 return -EPERM;
434
435         return 0;
436 }
437
438 static void lp8788_psy_unregister(struct lp8788_charger *pchg)
439 {
440         power_supply_unregister(&pchg->battery);
441         power_supply_unregister(&pchg->charger);
442 }
443
444 static void lp8788_charger_event(struct work_struct *work)
445 {
446         struct lp8788_charger *pchg =
447                 container_of(work, struct lp8788_charger, charger_work);
448         struct lp8788_charger_platform_data *pdata = pchg->pdata;
449         enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
450
451         pdata->charger_event(pchg->lp, event);
452 }
453
454 static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
455 {
456         bool found;
457         int i;
458
459         for (i = 0; i < pchg->num_irqs; i++) {
460                 if (pchg->irqs[i].virq == virq) {
461                         *id = pchg->irqs[i].which;
462                         found = true;
463                         break;
464                 }
465         }
466
467         return found;
468 }
469
470 static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
471 {
472         struct lp8788_charger *pchg = ptr;
473         struct lp8788_charger_platform_data *pdata = pchg->pdata;
474         int id = -1;
475
476         if (!lp8788_find_irq_id(pchg, virq, &id))
477                 return IRQ_NONE;
478
479         switch (id) {
480         case LP8788_INT_CHG_INPUT_STATE:
481         case LP8788_INT_CHG_STATE:
482         case LP8788_INT_EOC:
483         case LP8788_INT_BATT_LOW:
484         case LP8788_INT_NO_BATT:
485                 power_supply_changed(&pchg->charger);
486                 power_supply_changed(&pchg->battery);
487                 break;
488         default:
489                 break;
490         }
491
492         /* report charger dectection event if used */
493         if (!pdata)
494                 goto irq_handled;
495
496         if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
497                 schedule_work(&pchg->charger_work);
498
499 irq_handled:
500         return IRQ_HANDLED;
501 }
502
503 static int lp8788_set_irqs(struct platform_device *pdev,
504                         struct lp8788_charger *pchg, const char *name)
505 {
506         struct resource *r;
507         struct irq_domain *irqdm = pchg->lp->irqdm;
508         int irq_start;
509         int irq_end;
510         int virq;
511         int nr_irq;
512         int i;
513         int ret;
514
515         /* no error even if no irq resource */
516         r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
517         if (!r)
518                 return 0;
519
520         irq_start = r->start;
521         irq_end = r->end;
522
523         for (i = irq_start; i <= irq_end; i++) {
524                 nr_irq = pchg->num_irqs;
525
526                 virq = irq_create_mapping(irqdm, i);
527                 pchg->irqs[nr_irq].virq = virq;
528                 pchg->irqs[nr_irq].which = i;
529                 pchg->num_irqs++;
530
531                 ret = request_threaded_irq(virq, NULL,
532                                         lp8788_charger_irq_thread,
533                                         0, name, pchg);
534                 if (ret)
535                         break;
536         }
537
538         if (i <= irq_end)
539                 goto err_free_irq;
540
541         return 0;
542
543 err_free_irq:
544         for (i = 0; i < pchg->num_irqs; i++)
545                 free_irq(pchg->irqs[i].virq, pchg);
546         return ret;
547 }
548
549 static int lp8788_irq_register(struct platform_device *pdev,
550                                 struct lp8788_charger *pchg)
551 {
552         struct lp8788 *lp = pchg->lp;
553         const char *name[] = {
554                 LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
555         };
556         int i;
557         int ret;
558
559         INIT_WORK(&pchg->charger_work, lp8788_charger_event);
560         pchg->num_irqs = 0;
561
562         for (i = 0; i < ARRAY_SIZE(name); i++) {
563                 ret = lp8788_set_irqs(pdev, pchg, name[i]);
564                 if (ret) {
565                         dev_warn(lp->dev, "irq setup failed: %s\n", name[i]);
566                         return ret;
567                 }
568         }
569
570         if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
571                 dev_err(lp->dev, "invalid total number of irqs: %d\n",
572                         pchg->num_irqs);
573                 return -EINVAL;
574         }
575
576
577         return 0;
578 }
579
580 static void lp8788_irq_unregister(struct platform_device *pdev,
581                                   struct lp8788_charger *pchg)
582 {
583         int i;
584         int irq;
585
586         for (i = 0; i < pchg->num_irqs; i++) {
587                 irq = pchg->irqs[i].virq;
588                 if (!irq)
589                         continue;
590
591                 free_irq(irq, pchg);
592         }
593 }
594
595 static void lp8788_setup_adc_channel(struct lp8788_charger *pchg)
596 {
597         struct lp8788_charger_platform_data *pdata = pchg->pdata;
598         struct device *dev = pchg->lp->dev;
599         struct iio_channel *chan;
600         enum lp8788_adc_id id;
601         const char *chan_name[LPADC_MAX] = {
602                 [LPADC_VBATT_5P5] = "vbatt-5p5",
603                 [LPADC_VBATT_6P0] = "vbatt-6p0",
604                 [LPADC_VBATT_5P0] = "vbatt-5p0",
605                 [LPADC_ADC1]      = "adc1",
606                 [LPADC_ADC2]      = "adc2",
607                 [LPADC_ADC3]      = "adc3",
608                 [LPADC_ADC4]      = "adc4",
609         };
610
611         if (!pdata)
612                 return;
613
614         id = pdata->vbatt_adc;
615         switch (id) {
616         case LPADC_VBATT_5P5:
617         case LPADC_VBATT_6P0:
618         case LPADC_VBATT_5P0:
619                 chan = iio_channel_get(NULL, chan_name[id]);
620                 pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
621                 break;
622         default:
623                 dev_err(dev, "invalid ADC id for VBATT: %d\n", id);
624                 pchg->chan[LP8788_VBATT] = NULL;
625                 break;
626         }
627
628         id = pdata->batt_temp_adc;
629         switch (id) {
630         case LPADC_ADC1:
631         case LPADC_ADC2:
632         case LPADC_ADC3:
633         case LPADC_ADC4:
634                 chan = iio_channel_get(NULL, chan_name[id]);
635                 pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
636                 break;
637         default:
638                 dev_err(dev, "invalid ADC id for BATT_TEMP : %d\n", id);
639                 pchg->chan[LP8788_BATT_TEMP] = NULL;
640                 break;
641         }
642 }
643
644 static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
645 {
646         int i;
647
648         for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
649                 if (!pchg->chan[i])
650                         continue;
651
652                 iio_channel_release(pchg->chan[i]);
653                 pchg->chan[i] = NULL;
654         }
655 }
656
657 static ssize_t lp8788_show_charger_status(struct device *dev,
658                                 struct device_attribute *attr, char *buf)
659 {
660         struct lp8788_charger *pchg = dev_get_drvdata(dev);
661         enum lp8788_charging_state state;
662         char *desc[LP8788_MAX_CHG_STATE] = {
663                 [LP8788_OFF] = "CHARGER OFF",
664                 [LP8788_WARM_UP] = "WARM UP",
665                 [LP8788_LOW_INPUT] = "LOW INPUT STATE",
666                 [LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
667                 [LP8788_CC] = "CHARGING - CC",
668                 [LP8788_CV] = "CHARGING - CV",
669                 [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
670                 [LP8788_BATTERY_FAULT] = "BATTERY FAULT",
671                 [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
672                 [LP8788_HIGH_CURRENT] = "HIGH CURRENT",
673         };
674         u8 data;
675
676         lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
677         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
678
679         return scnprintf(buf, LP8788_BUF_SIZE, "%s\n", desc[state]);
680 }
681
682 static ssize_t lp8788_show_eoc_time(struct device *dev,
683                                 struct device_attribute *attr, char *buf)
684 {
685         struct lp8788_charger *pchg = dev_get_drvdata(dev);
686         char *stime[] = { "400ms", "5min", "10min", "15min",
687                         "20min", "25min", "30min" "No timeout" };
688         u8 val;
689
690         lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
691         val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
692
693         return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Time: %s\n",
694                         stime[val]);
695 }
696
697 static ssize_t lp8788_show_eoc_level(struct device *dev,
698                                 struct device_attribute *attr, char *buf)
699 {
700         struct lp8788_charger *pchg = dev_get_drvdata(dev);
701         char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
702         char *relative_level[] = { "5%", "10%", "15%", "20%" };
703         char *level;
704         u8 val;
705         u8 mode;
706
707         lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
708
709         mode = val & LP8788_CHG_EOC_MODE_M;
710         val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
711         level = mode ? abs_level[val] : relative_level[val];
712
713         return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Level: %s\n",
714                         level);
715 }
716
717 static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
718 static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
719 static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
720
721 static struct attribute *lp8788_charger_attr[] = {
722         &dev_attr_charger_status.attr,
723         &dev_attr_eoc_time.attr,
724         &dev_attr_eoc_level.attr,
725         NULL,
726 };
727
728 static const struct attribute_group lp8788_attr_group = {
729         .attrs = lp8788_charger_attr,
730 };
731
732 static __devinit int lp8788_charger_probe(struct platform_device *pdev)
733 {
734         struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
735         struct lp8788_charger *pchg;
736         int ret;
737
738         pchg = devm_kzalloc(lp->dev, sizeof(struct lp8788_charger), GFP_KERNEL);
739         if (!pchg)
740                 return -ENOMEM;
741
742         pchg->lp = lp;
743         pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
744         platform_set_drvdata(pdev, pchg);
745
746         ret = lp8788_update_charger_params(pchg);
747         if (ret)
748                 return ret;
749
750         lp8788_setup_adc_channel(pchg);
751
752         ret = lp8788_psy_register(pdev, pchg);
753         if (ret)
754                 return ret;
755
756         ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
757         if (ret) {
758                 lp8788_psy_unregister(pchg);
759                 return ret;
760         }
761
762         ret = lp8788_irq_register(pdev, pchg);
763         if (ret)
764                 dev_warn(lp->dev, "failed to register charger irq: %d\n", ret);
765
766         return 0;
767 }
768
769 static int __devexit lp8788_charger_remove(struct platform_device *pdev)
770 {
771         struct lp8788_charger *pchg = platform_get_drvdata(pdev);
772
773         flush_work(&pchg->charger_work);
774         lp8788_irq_unregister(pdev, pchg);
775         sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
776         lp8788_psy_unregister(pchg);
777         lp8788_release_adc_channel(pchg);
778
779         return 0;
780 }
781
782 static struct platform_driver lp8788_charger_driver = {
783         .probe = lp8788_charger_probe,
784         .remove = __devexit_p(lp8788_charger_remove),
785         .driver = {
786                 .name = LP8788_DEV_CHARGER,
787                 .owner = THIS_MODULE,
788         },
789 };
790 module_platform_driver(lp8788_charger_driver);
791
792 MODULE_DESCRIPTION("TI LP8788 Charger Driver");
793 MODULE_AUTHOR("Milo Kim");
794 MODULE_LICENSE("GPL");
795 MODULE_ALIAS("platform:lp8788-charger");