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
lp8788_is_charger_detected(struct lp8788_charger * pchg)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
lp8788_charger_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)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
lp8788_get_battery_status(struct lp8788_charger * pchg,union power_supply_propval * val)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
lp8788_get_battery_health(struct lp8788_charger * pchg,union power_supply_propval * val)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
lp8788_get_battery_present(struct lp8788_charger * pchg,union power_supply_propval * val)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
lp8788_get_vbatt_adc(struct lp8788_charger * pchg,int * result)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
lp8788_get_battery_voltage(struct lp8788_charger * pchg,union power_supply_propval * val)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
lp8788_get_battery_capacity(struct lp8788_charger * pchg,union power_supply_propval * val)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
lp8788_get_battery_temperature(struct lp8788_charger * pchg,union power_supply_propval * val)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
lp8788_get_battery_charging_current(struct lp8788_charger * pchg,union power_supply_propval * val)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
lp8788_get_charging_termination_voltage(struct lp8788_charger * pchg,union power_supply_propval * val)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
lp8788_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)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
lp8788_is_valid_charger_register(u8 addr)364 static inline bool lp8788_is_valid_charger_register(u8 addr)
365 {
366 return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
367 }
368
lp8788_update_charger_params(struct platform_device * pdev,struct lp8788_charger * pchg)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
lp8788_psy_register(struct platform_device * pdev,struct lp8788_charger * pchg)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 power_supply_unregister(&pchg->charger);
422 return -EPERM;
423 }
424
425 return 0;
426 }
427
lp8788_psy_unregister(struct lp8788_charger * pchg)428 static void lp8788_psy_unregister(struct lp8788_charger *pchg)
429 {
430 power_supply_unregister(&pchg->battery);
431 power_supply_unregister(&pchg->charger);
432 }
433
lp8788_charger_event(struct work_struct * work)434 static void lp8788_charger_event(struct work_struct *work)
435 {
436 struct lp8788_charger *pchg =
437 container_of(work, struct lp8788_charger, charger_work);
438 struct lp8788_charger_platform_data *pdata = pchg->pdata;
439 enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
440
441 pdata->charger_event(pchg->lp, event);
442 }
443
lp8788_find_irq_id(struct lp8788_charger * pchg,int virq,int * id)444 static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
445 {
446 bool found;
447 int i;
448
449 for (i = 0; i < pchg->num_irqs; i++) {
450 if (pchg->irqs[i].virq == virq) {
451 *id = pchg->irqs[i].which;
452 found = true;
453 break;
454 }
455 }
456
457 return found;
458 }
459
lp8788_charger_irq_thread(int virq,void * ptr)460 static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
461 {
462 struct lp8788_charger *pchg = ptr;
463 struct lp8788_charger_platform_data *pdata = pchg->pdata;
464 int id = -1;
465
466 if (!lp8788_find_irq_id(pchg, virq, &id))
467 return IRQ_NONE;
468
469 switch (id) {
470 case LP8788_INT_CHG_INPUT_STATE:
471 case LP8788_INT_CHG_STATE:
472 case LP8788_INT_EOC:
473 case LP8788_INT_BATT_LOW:
474 case LP8788_INT_NO_BATT:
475 power_supply_changed(&pchg->charger);
476 power_supply_changed(&pchg->battery);
477 break;
478 default:
479 break;
480 }
481
482 /* report charger dectection event if used */
483 if (!pdata)
484 goto irq_handled;
485
486 if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
487 schedule_work(&pchg->charger_work);
488
489 irq_handled:
490 return IRQ_HANDLED;
491 }
492
lp8788_set_irqs(struct platform_device * pdev,struct lp8788_charger * pchg,const char * name)493 static int lp8788_set_irqs(struct platform_device *pdev,
494 struct lp8788_charger *pchg, const char *name)
495 {
496 struct resource *r;
497 struct irq_domain *irqdm = pchg->lp->irqdm;
498 int irq_start;
499 int irq_end;
500 int virq;
501 int nr_irq;
502 int i;
503 int ret;
504
505 /* no error even if no irq resource */
506 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
507 if (!r)
508 return 0;
509
510 irq_start = r->start;
511 irq_end = r->end;
512
513 for (i = irq_start; i <= irq_end; i++) {
514 nr_irq = pchg->num_irqs;
515
516 virq = irq_create_mapping(irqdm, i);
517 pchg->irqs[nr_irq].virq = virq;
518 pchg->irqs[nr_irq].which = i;
519 pchg->num_irqs++;
520
521 ret = request_threaded_irq(virq, NULL,
522 lp8788_charger_irq_thread,
523 0, name, pchg);
524 if (ret)
525 break;
526 }
527
528 if (i <= irq_end)
529 goto err_free_irq;
530
531 return 0;
532
533 err_free_irq:
534 for (i = 0; i < pchg->num_irqs; i++)
535 free_irq(pchg->irqs[i].virq, pchg);
536 return ret;
537 }
538
lp8788_irq_register(struct platform_device * pdev,struct lp8788_charger * pchg)539 static int lp8788_irq_register(struct platform_device *pdev,
540 struct lp8788_charger *pchg)
541 {
542 const char *name[] = {
543 LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
544 };
545 int i;
546 int ret;
547
548 INIT_WORK(&pchg->charger_work, lp8788_charger_event);
549 pchg->num_irqs = 0;
550
551 for (i = 0; i < ARRAY_SIZE(name); i++) {
552 ret = lp8788_set_irqs(pdev, pchg, name[i]);
553 if (ret) {
554 dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]);
555 return ret;
556 }
557 }
558
559 if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
560 dev_err(&pdev->dev, "invalid total number of irqs: %d\n",
561 pchg->num_irqs);
562 return -EINVAL;
563 }
564
565
566 return 0;
567 }
568
lp8788_irq_unregister(struct platform_device * pdev,struct lp8788_charger * pchg)569 static void lp8788_irq_unregister(struct platform_device *pdev,
570 struct lp8788_charger *pchg)
571 {
572 int i;
573 int irq;
574
575 for (i = 0; i < pchg->num_irqs; i++) {
576 irq = pchg->irqs[i].virq;
577 if (!irq)
578 continue;
579
580 free_irq(irq, pchg);
581 }
582 }
583
lp8788_setup_adc_channel(struct device * dev,struct lp8788_charger * pchg)584 static void lp8788_setup_adc_channel(struct device *dev,
585 struct lp8788_charger *pchg)
586 {
587 struct lp8788_charger_platform_data *pdata = pchg->pdata;
588 struct iio_channel *chan;
589
590 if (!pdata)
591 return;
592
593 /* ADC channel for battery voltage */
594 chan = iio_channel_get(dev, pdata->adc_vbatt);
595 pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
596
597 /* ADC channel for battery temperature */
598 chan = iio_channel_get(dev, pdata->adc_batt_temp);
599 pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
600 }
601
lp8788_release_adc_channel(struct lp8788_charger * pchg)602 static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
603 {
604 int i;
605
606 for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
607 if (!pchg->chan[i])
608 continue;
609
610 iio_channel_release(pchg->chan[i]);
611 pchg->chan[i] = NULL;
612 }
613 }
614
lp8788_show_charger_status(struct device * dev,struct device_attribute * attr,char * buf)615 static ssize_t lp8788_show_charger_status(struct device *dev,
616 struct device_attribute *attr, char *buf)
617 {
618 struct lp8788_charger *pchg = dev_get_drvdata(dev);
619 enum lp8788_charging_state state;
620 char *desc[LP8788_MAX_CHG_STATE] = {
621 [LP8788_OFF] = "CHARGER OFF",
622 [LP8788_WARM_UP] = "WARM UP",
623 [LP8788_LOW_INPUT] = "LOW INPUT STATE",
624 [LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
625 [LP8788_CC] = "CHARGING - CC",
626 [LP8788_CV] = "CHARGING - CV",
627 [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
628 [LP8788_BATTERY_FAULT] = "BATTERY FAULT",
629 [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
630 [LP8788_HIGH_CURRENT] = "HIGH CURRENT",
631 };
632 u8 data;
633
634 lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
635 state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
636
637 return scnprintf(buf, PAGE_SIZE, "%s\n", desc[state]);
638 }
639
lp8788_show_eoc_time(struct device * dev,struct device_attribute * attr,char * buf)640 static ssize_t lp8788_show_eoc_time(struct device *dev,
641 struct device_attribute *attr, char *buf)
642 {
643 struct lp8788_charger *pchg = dev_get_drvdata(dev);
644 char *stime[] = { "400ms", "5min", "10min", "15min",
645 "20min", "25min", "30min" "No timeout" };
646 u8 val;
647
648 lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
649 val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
650
651 return scnprintf(buf, PAGE_SIZE, "End Of Charge Time: %s\n",
652 stime[val]);
653 }
654
lp8788_show_eoc_level(struct device * dev,struct device_attribute * attr,char * buf)655 static ssize_t lp8788_show_eoc_level(struct device *dev,
656 struct device_attribute *attr, char *buf)
657 {
658 struct lp8788_charger *pchg = dev_get_drvdata(dev);
659 char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
660 char *relative_level[] = { "5%", "10%", "15%", "20%" };
661 char *level;
662 u8 val;
663 u8 mode;
664
665 lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
666
667 mode = val & LP8788_CHG_EOC_MODE_M;
668 val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
669 level = mode ? abs_level[val] : relative_level[val];
670
671 return scnprintf(buf, PAGE_SIZE, "End Of Charge Level: %s\n", level);
672 }
673
674 static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
675 static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
676 static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
677
678 static struct attribute *lp8788_charger_attr[] = {
679 &dev_attr_charger_status.attr,
680 &dev_attr_eoc_time.attr,
681 &dev_attr_eoc_level.attr,
682 NULL,
683 };
684
685 static const struct attribute_group lp8788_attr_group = {
686 .attrs = lp8788_charger_attr,
687 };
688
lp8788_charger_probe(struct platform_device * pdev)689 static int lp8788_charger_probe(struct platform_device *pdev)
690 {
691 struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
692 struct lp8788_charger *pchg;
693 struct device *dev = &pdev->dev;
694 int ret;
695
696 pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL);
697 if (!pchg)
698 return -ENOMEM;
699
700 pchg->lp = lp;
701 pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
702 platform_set_drvdata(pdev, pchg);
703
704 ret = lp8788_update_charger_params(pdev, pchg);
705 if (ret)
706 return ret;
707
708 lp8788_setup_adc_channel(&pdev->dev, pchg);
709
710 ret = lp8788_psy_register(pdev, pchg);
711 if (ret)
712 return ret;
713
714 ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
715 if (ret) {
716 lp8788_psy_unregister(pchg);
717 return ret;
718 }
719
720 ret = lp8788_irq_register(pdev, pchg);
721 if (ret)
722 dev_warn(dev, "failed to register charger irq: %d\n", ret);
723
724 return 0;
725 }
726
lp8788_charger_remove(struct platform_device * pdev)727 static int lp8788_charger_remove(struct platform_device *pdev)
728 {
729 struct lp8788_charger *pchg = platform_get_drvdata(pdev);
730
731 flush_work(&pchg->charger_work);
732 lp8788_irq_unregister(pdev, pchg);
733 sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
734 lp8788_psy_unregister(pchg);
735 lp8788_release_adc_channel(pchg);
736
737 return 0;
738 }
739
740 static struct platform_driver lp8788_charger_driver = {
741 .probe = lp8788_charger_probe,
742 .remove = lp8788_charger_remove,
743 .driver = {
744 .name = LP8788_DEV_CHARGER,
745 .owner = THIS_MODULE,
746 },
747 };
748 module_platform_driver(lp8788_charger_driver);
749
750 MODULE_DESCRIPTION("TI LP8788 Charger Driver");
751 MODULE_AUTHOR("Milo Kim");
752 MODULE_LICENSE("GPL");
753 MODULE_ALIAS("platform:lp8788-charger");
754