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lp8788-charger: Fix wrong ADC conversion
[deliverable/linux.git] / drivers / power / lp8788-charger.c
CommitLineData
98a27664
KM		 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
60enum 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
74enum lp8788_charger_adc_sel {
75 LP8788_VBATT,
76 LP8788_BATT_TEMP,
77 LP8788_NUM_CHG_ADC,
78};
79
80enum 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 */
90struct 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 */
107struct 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
118static char *battery_supplied_to[] = {
119 LP8788_BATTERY_NAME,
120};
121
122static enum power_supply_property lp8788_charger_prop[] = {
123 POWER_SUPPLY_PROP_ONLINE,
124 POWER_SUPPLY_PROP_CURRENT_MAX,
125};
126
127static 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
138static 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
148static 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
171static 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
204static 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
224static 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
340968de 238static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg, int *result)
98a27664
KM		 239{
240 struct iio_channel *channel = pchg->chan[LP8788_VBATT];
98a27664
KM		 241
242 if (!channel)
243 return -EINVAL;
244
340968de 245 return iio_read_channel_processed(channel, result);
98a27664
KM		 246}
247
248static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
249 union power_supply_propval *val)
250{
251 return lp8788_get_vbatt_adc(pchg, &val->intval);
252}
253
254static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
255 union power_supply_propval *val)
256{
257 struct lp8788 *lp = pchg->lp;
258 struct lp8788_charger_platform_data *pdata = pchg->pdata;
259 unsigned int max_vbatt;
340968de 260 int vbatt;
98a27664
KM		 261 enum lp8788_charging_state state;
262 u8 data;
263 int ret;
264
265 if (!pdata)
266 return -EINVAL;
267
268 max_vbatt = pdata->max_vbatt_mv;
269 if (max_vbatt == 0)
270 return -EINVAL;
271
272 ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
273 if (ret)
274 return ret;
275
276 state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
277
278 if (state == LP8788_MAINTENANCE) {
279 val->intval = LP8788_MAX_BATT_CAPACITY;
280 } else {
281 ret = lp8788_get_vbatt_adc(pchg, &vbatt);
282 if (ret)
283 return ret;
284
285 val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
286 val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
287 }
288
289 return 0;
290}
291
292static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
293 union power_supply_propval *val)
294{
295 struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
340968de 296 int result;
98a27664
KM		 297 int ret;
298
299 if (!channel)
300 return -EINVAL;
301
340968de
KM		 302 ret = iio_read_channel_processed(channel, &result);
303 if (ret < 0)
98a27664
KM		 304 return -EINVAL;
305
306 /* unit: 0.1 'C */
340968de 307 val->intval = result * 10;
98a27664
KM		 308
309 return 0;
310}
311
312static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
313 union power_supply_propval *val)
314{
315 u8 read;
316
317 lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
318 read &= LP8788_CHG_IBATT_M;
319 val->intval = LP8788_ISEL_STEP *
320 (min_t(int, read, LP8788_ISEL_MAX) + 1);
321
322 return 0;
323}
324
325static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
326 union power_supply_propval *val)
327{
328 u8 read;
329
330 lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
331 read &= LP8788_CHG_VTERM_M;
332 val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
333
334 return 0;
335}
336
337static int lp8788_battery_get_property(struct power_supply *psy,
338 enum power_supply_property psp,
339 union power_supply_propval *val)
340{
341 struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
342
343 switch (psp) {
344 case POWER_SUPPLY_PROP_STATUS:
345 return lp8788_get_battery_status(pchg, val);
346 case POWER_SUPPLY_PROP_HEALTH:
347 return lp8788_get_battery_health(pchg, val);
348 case POWER_SUPPLY_PROP_PRESENT:
349 return lp8788_get_battery_present(pchg, val);
350 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
351 return lp8788_get_battery_voltage(pchg, val);
352 case POWER_SUPPLY_PROP_CAPACITY:
353 return lp8788_get_battery_capacity(pchg, val);
354 case POWER_SUPPLY_PROP_TEMP:
355 return lp8788_get_battery_temperature(pchg, val);
356 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
357 return lp8788_get_battery_charging_current(pchg, val);
358 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
359 return lp8788_get_charging_termination_voltage(pchg, val);
360 default:
361 return -EINVAL;
362 }
363}
364
365static inline bool lp8788_is_valid_charger_register(u8 addr)
366{
367 return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
368}
369
370static int lp8788_update_charger_params(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(lp->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
400static 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
426static void lp8788_psy_unregister(struct lp8788_charger *pchg)
427{
428 power_supply_unregister(&pchg->battery);
429 power_supply_unregister(&pchg->charger);
430}
431
432static 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
442static 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
458static 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
487irq_handled:
488 return IRQ_HANDLED;
489}
490
491static 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
531err_free_irq:
532 for (i = 0; i < pchg->num_irqs; i++)
533 free_irq(pchg->irqs[i].virq, pchg);
534 return ret;
535}
536
537static int lp8788_irq_register(struct platform_device *pdev,
538 struct lp8788_charger *pchg)
539{
540 struct lp8788 *lp = pchg->lp;
541 const char *name[] = {
542 LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
543 };
544 int i;
545 int ret;
546
547 INIT_WORK(&pchg->charger_work, lp8788_charger_event);
548 pchg->num_irqs = 0;
549
550 for (i = 0; i < ARRAY_SIZE(name); i++) {
551 ret = lp8788_set_irqs(pdev, pchg, name[i]);
552 if (ret) {
553 dev_warn(lp->dev, "irq setup failed: %s\n", name[i]);
554 return ret;
555 }
556 }
557
558 if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
559 dev_err(lp->dev, "invalid total number of irqs: %d\n",
560 pchg->num_irqs);
561 return -EINVAL;
562 }
563
564
565 return 0;
566}
567
568static void lp8788_irq_unregister(struct platform_device *pdev,
569 struct lp8788_charger *pchg)
570{
571 int i;
572 int irq;
573
574 for (i = 0; i < pchg->num_irqs; i++) {
575 irq = pchg->irqs[i].virq;
576 if (!irq)
577 continue;
578
579 free_irq(irq, pchg);
580 }
581}
582
968a4783
KM		 583static void lp8788_setup_adc_channel(const char *consumer_name,
584 struct lp8788_charger *pchg)
98a27664
KM		 585{
586 struct lp8788_charger_platform_data *pdata = pchg->pdata;
587 struct device *dev = pchg->lp->dev;
588 struct iio_channel *chan;
589 enum lp8788_adc_id id;
590 const char *chan_name[LPADC_MAX] = {
591 [LPADC_VBATT_5P5] = "vbatt-5p5",
592 [LPADC_VBATT_6P0] = "vbatt-6p0",
593 [LPADC_VBATT_5P0] = "vbatt-5p0",
594 [LPADC_ADC1] = "adc1",
595 [LPADC_ADC2] = "adc2",
596 [LPADC_ADC3] = "adc3",
597 [LPADC_ADC4] = "adc4",
598 };
599
600 if (!pdata)
601 return;
602
603 id = pdata->vbatt_adc;
604 switch (id) {
605 case LPADC_VBATT_5P5:
606 case LPADC_VBATT_6P0:
607 case LPADC_VBATT_5P0:
968a4783 608 chan = iio_channel_get(consumer_name, chan_name[id]);
98a27664
KM		 609 pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
610 break;
611 default:
612 dev_err(dev, "invalid ADC id for VBATT: %d\n", id);
613 pchg->chan[LP8788_VBATT] = NULL;
614 break;
615 }
616
617 id = pdata->batt_temp_adc;
618 switch (id) {
619 case LPADC_ADC1:
620 case LPADC_ADC2:
621 case LPADC_ADC3:
622 case LPADC_ADC4:
968a4783 623 chan = iio_channel_get(consumer_name, chan_name[id]);
98a27664
KM		 624 pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
625 break;
626 default:
627 dev_err(dev, "invalid ADC id for BATT_TEMP : %d\n", id);
628 pchg->chan[LP8788_BATT_TEMP] = NULL;
629 break;
630 }
631}
632
633static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
634{
635 int i;
636
637 for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
638 if (!pchg->chan[i])
639 continue;
640
641 iio_channel_release(pchg->chan[i]);
642 pchg->chan[i] = NULL;
643 }
644}
645
646static ssize_t lp8788_show_charger_status(struct device *dev,
647 struct device_attribute *attr, char *buf)
648{
649 struct lp8788_charger *pchg = dev_get_drvdata(dev);
650 enum lp8788_charging_state state;
651 char *desc[LP8788_MAX_CHG_STATE] = {
652 [LP8788_OFF] = "CHARGER OFF",
653 [LP8788_WARM_UP] = "WARM UP",
654 [LP8788_LOW_INPUT] = "LOW INPUT STATE",
655 [LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
656 [LP8788_CC] = "CHARGING - CC",
657 [LP8788_CV] = "CHARGING - CV",
658 [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
659 [LP8788_BATTERY_FAULT] = "BATTERY FAULT",
660 [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
661 [LP8788_HIGH_CURRENT] = "HIGH CURRENT",
662 };
663 u8 data;
664
665 lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
666 state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
667
668 return scnprintf(buf, LP8788_BUF_SIZE, "%s\n", desc[state]);
669}
670
671static ssize_t lp8788_show_eoc_time(struct device *dev,
672 struct device_attribute *attr, char *buf)
673{
674 struct lp8788_charger *pchg = dev_get_drvdata(dev);
675 char *stime[] = { "400ms", "5min", "10min", "15min",
676 "20min", "25min", "30min" "No timeout" };
677 u8 val;
678
679 lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
680 val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
681
682 return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Time: %s\n",
683 stime[val]);
684}
685
686static ssize_t lp8788_show_eoc_level(struct device *dev,
687 struct device_attribute *attr, char *buf)
688{
689 struct lp8788_charger *pchg = dev_get_drvdata(dev);
690 char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
691 char *relative_level[] = { "5%", "10%", "15%", "20%" };
692 char *level;
693 u8 val;
694 u8 mode;
695
696 lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
697
698 mode = val & LP8788_CHG_EOC_MODE_M;
699 val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
700 level = mode ? abs_level[val] : relative_level[val];
701
702 return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Level: %s\n",
703 level);
704}
705
706static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
707static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
708static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
709
710static struct attribute *lp8788_charger_attr[] = {
711 &dev_attr_charger_status.attr,
712 &dev_attr_eoc_time.attr,
713 &dev_attr_eoc_level.attr,
714 NULL,
715};
716
717static const struct attribute_group lp8788_attr_group = {
718 .attrs = lp8788_charger_attr,
719};
720
721static __devinit int lp8788_charger_probe(struct platform_device *pdev)
722{
723 struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
724 struct lp8788_charger *pchg;
725 int ret;
726
727 pchg = devm_kzalloc(lp->dev, sizeof(struct lp8788_charger), GFP_KERNEL);
728 if (!pchg)
729 return -ENOMEM;
730
731 pchg->lp = lp;
732 pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
733 platform_set_drvdata(pdev, pchg);
734
735 ret = lp8788_update_charger_params(pchg);
736 if (ret)
737 return ret;
738
968a4783 739 lp8788_setup_adc_channel(pdev->name, pchg);
98a27664
KM		 740
741 ret = lp8788_psy_register(pdev, pchg);
742 if (ret)
743 return ret;
744
745 ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
746 if (ret) {
747 lp8788_psy_unregister(pchg);
748 return ret;
749 }
750
751 ret = lp8788_irq_register(pdev, pchg);
752 if (ret)
753 dev_warn(lp->dev, "failed to register charger irq: %d\n", ret);
754
755 return 0;
756}
757
758static int __devexit lp8788_charger_remove(struct platform_device *pdev)
759{
760 struct lp8788_charger *pchg = platform_get_drvdata(pdev);
761
762 flush_work(&pchg->charger_work);
763 lp8788_irq_unregister(pdev, pchg);
764 sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
765 lp8788_psy_unregister(pchg);
766 lp8788_release_adc_channel(pchg);
767
768 return 0;
769}
770
771static struct platform_driver lp8788_charger_driver = {
772 .probe = lp8788_charger_probe,
773 .remove = __devexit_p(lp8788_charger_remove),
774 .driver = {
775 .name = LP8788_DEV_CHARGER,
776 .owner = THIS_MODULE,
777 },
778};
779module_platform_driver(lp8788_charger_driver);
780
781MODULE_DESCRIPTION("TI LP8788 Charger Driver");
782MODULE_AUTHOR("Milo Kim");
783MODULE_LICENSE("GPL");
784MODULE_ALIAS("platform:lp8788-charger");
Linux kernel - Deliverables
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