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9#include <linux/module.h>
10#include <linux/slab.h>
11#include <linux/interrupt.h>
12#include <linux/i2c.h>
13#include <linux/power_supply.h>
14#include <linux/platform_data/lp8727.h>
15#include <linux/of.h>
16
17#define LP8788_NUM_INTREGS 2
18#define DEFAULT_DEBOUNCE_MSEC 270
19
20
21#define LP8727_CTRL1 0x1
22#define LP8727_CTRL2 0x2
23#define LP8727_SWCTRL 0x3
24#define LP8727_INT1 0x4
25#define LP8727_INT2 0x5
26#define LP8727_STATUS1 0x6
27#define LP8727_STATUS2 0x7
28#define LP8727_CHGCTRL2 0x9
29
30
31#define LP8727_CP_EN BIT(0)
32#define LP8727_ADC_EN BIT(1)
33#define LP8727_ID200_EN BIT(4)
34
35
36#define LP8727_CHGDET_EN BIT(1)
37#define LP8727_INT_EN BIT(6)
38
39
40#define LP8727_SW_DM1_DM (0x0 << 0)
41#define LP8727_SW_DM1_HiZ (0x7 << 0)
42#define LP8727_SW_DP2_DP (0x0 << 3)
43#define LP8727_SW_DP2_HiZ (0x7 << 3)
44
45
46#define LP8727_IDNO (0xF << 0)
47#define LP8727_VBUS BIT(4)
48
49
50#define LP8727_CHGSTAT (3 << 4)
51#define LP8727_CHPORT BIT(6)
52#define LP8727_DCPORT BIT(7)
53#define LP8727_STAT_EOC 0x30
54
55
56#define LP8727_TEMP_STAT (3 << 5)
57#define LP8727_TEMP_SHIFT 5
58
59
60#define LP8727_ICHG_SHIFT 4
61
62enum lp8727_dev_id {
63 LP8727_ID_NONE,
64 LP8727_ID_TA,
65 LP8727_ID_DEDICATED_CHG,
66 LP8727_ID_USB_CHG,
67 LP8727_ID_USB_DS,
68 LP8727_ID_MAX,
69};
70
71enum lp8727_die_temp {
72 LP8788_TEMP_75C,
73 LP8788_TEMP_95C,
74 LP8788_TEMP_115C,
75 LP8788_TEMP_135C,
76};
77
78struct lp8727_psy {
79 struct power_supply *ac;
80 struct power_supply *usb;
81 struct power_supply *batt;
82};
83
84struct lp8727_chg {
85 struct device *dev;
86 struct i2c_client *client;
87 struct mutex xfer_lock;
88 struct lp8727_psy *psy;
89 struct lp8727_platform_data *pdata;
90
91
92 enum lp8727_dev_id devid;
93 struct lp8727_chg_param *chg_param;
94
95
96 int irq;
97 struct delayed_work work;
98 unsigned long debounce_jiffies;
99};
100
101static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
102{
103 s32 ret;
104
105 mutex_lock(&pchg->xfer_lock);
106 ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
107 mutex_unlock(&pchg->xfer_lock);
108
109 return (ret != len) ? -EIO : 0;
110}
111
112static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data)
113{
114 return lp8727_read_bytes(pchg, reg, data, 1);
115}
116
117static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
118{
119 int ret;
120
121 mutex_lock(&pchg->xfer_lock);
122 ret = i2c_smbus_write_byte_data(pchg->client, reg, data);
123 mutex_unlock(&pchg->xfer_lock);
124
125 return ret;
126}
127
128static bool lp8727_is_charger_attached(const char *name, int id)
129{
130 if (!strcmp(name, "ac"))
131 return id == LP8727_ID_TA || id == LP8727_ID_DEDICATED_CHG;
132 else if (!strcmp(name, "usb"))
133 return id == LP8727_ID_USB_CHG;
134
135 return id >= LP8727_ID_TA && id <= LP8727_ID_USB_CHG;
136}
137
138static int lp8727_init_device(struct lp8727_chg *pchg)
139{
140 u8 val;
141 int ret;
142 u8 intstat[LP8788_NUM_INTREGS];
143
144
145 ret = lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS);
146 if (ret)
147 return ret;
148
149 val = LP8727_ID200_EN | LP8727_ADC_EN | LP8727_CP_EN;
150 ret = lp8727_write_byte(pchg, LP8727_CTRL1, val);
151 if (ret)
152 return ret;
153
154 val = LP8727_INT_EN | LP8727_CHGDET_EN;
155 return lp8727_write_byte(pchg, LP8727_CTRL2, val);
156}
157
158static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
159{
160 u8 val;
161
162 lp8727_read_byte(pchg, LP8727_STATUS1, &val);
163 return val & LP8727_DCPORT;
164}
165
166static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
167{
168 u8 val;
169
170 lp8727_read_byte(pchg, LP8727_STATUS1, &val);
171 return val & LP8727_CHPORT;
172}
173
174static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
175{
176 lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
177}
178
179static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
180{
181 struct lp8727_platform_data *pdata = pchg->pdata;
182 u8 devid = LP8727_ID_NONE;
183 u8 swctrl = LP8727_SW_DM1_HiZ | LP8727_SW_DP2_HiZ;
184
185 switch (id) {
186 case 0x5:
187 devid = LP8727_ID_TA;
188 pchg->chg_param = pdata ? pdata->ac : NULL;
189 break;
190 case 0xB:
191 if (lp8727_is_dedicated_charger(pchg)) {
192 pchg->chg_param = pdata ? pdata->ac : NULL;
193 devid = LP8727_ID_DEDICATED_CHG;
194 } else if (lp8727_is_usb_charger(pchg)) {
195 pchg->chg_param = pdata ? pdata->usb : NULL;
196 devid = LP8727_ID_USB_CHG;
197 swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
198 } else if (vbusin) {
199 devid = LP8727_ID_USB_DS;
200 swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
201 }
202 break;
203 default:
204 devid = LP8727_ID_NONE;
205 pchg->chg_param = NULL;
206 break;
207 }
208
209 pchg->devid = devid;
210 lp8727_ctrl_switch(pchg, swctrl);
211}
212
213static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
214{
215 u8 val;
216
217 lp8727_read_byte(pchg, LP8727_CTRL2, &val);
218 val |= LP8727_CHGDET_EN;
219 lp8727_write_byte(pchg, LP8727_CTRL2, val);
220}
221
222static void lp8727_delayed_func(struct work_struct *_work)
223{
224 struct lp8727_chg *pchg = container_of(_work, struct lp8727_chg,
225 work.work);
226 u8 intstat[LP8788_NUM_INTREGS];
227 u8 idno;
228 u8 vbus;
229
230 if (lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS)) {
231 dev_err(pchg->dev, "can not read INT registers\n");
232 return;
233 }
234
235 idno = intstat[0] & LP8727_IDNO;
236 vbus = intstat[0] & LP8727_VBUS;
237
238 lp8727_id_detection(pchg, idno, vbus);
239 lp8727_enable_chgdet(pchg);
240
241 power_supply_changed(pchg->psy->ac);
242 power_supply_changed(pchg->psy->usb);
243 power_supply_changed(pchg->psy->batt);
244}
245
246static irqreturn_t lp8727_isr_func(int irq, void *ptr)
247{
248 struct lp8727_chg *pchg = ptr;
249
250 schedule_delayed_work(&pchg->work, pchg->debounce_jiffies);
251 return IRQ_HANDLED;
252}
253
254static int lp8727_setup_irq(struct lp8727_chg *pchg)
255{
256 int ret;
257 int irq = pchg->client->irq;
258 unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
259 DEFAULT_DEBOUNCE_MSEC;
260
261 INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
262
263 if (irq <= 0) {
264 dev_warn(pchg->dev, "invalid irq number: %d\n", irq);
265 return 0;
266 }
267
268 ret = request_threaded_irq(irq, NULL, lp8727_isr_func,
269 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
270 "lp8727_irq", pchg);
271
272 if (ret)
273 return ret;
274
275 pchg->irq = irq;
276 pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);
277
278 return 0;
279}
280
281static void lp8727_release_irq(struct lp8727_chg *pchg)
282{
283 cancel_delayed_work_sync(&pchg->work);
284
285 if (pchg->irq)
286 free_irq(pchg->irq, pchg);
287}
288
289static enum power_supply_property lp8727_charger_prop[] = {
290 POWER_SUPPLY_PROP_ONLINE,
291};
292
293static enum power_supply_property lp8727_battery_prop[] = {
294 POWER_SUPPLY_PROP_STATUS,
295 POWER_SUPPLY_PROP_HEALTH,
296 POWER_SUPPLY_PROP_PRESENT,
297 POWER_SUPPLY_PROP_VOLTAGE_NOW,
298 POWER_SUPPLY_PROP_CAPACITY,
299 POWER_SUPPLY_PROP_TEMP,
300};
301
302static char *battery_supplied_to[] = {
303 "main_batt",
304};
305
306static int lp8727_charger_get_property(struct power_supply *psy,
307 enum power_supply_property psp,
308 union power_supply_propval *val)
309{
310 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
311
312 if (psp != POWER_SUPPLY_PROP_ONLINE)
313 return -EINVAL;
314
315 val->intval = lp8727_is_charger_attached(psy->desc->name, pchg->devid);
316
317 return 0;
318}
319
320static bool lp8727_is_high_temperature(enum lp8727_die_temp temp)
321{
322 switch (temp) {
323 case LP8788_TEMP_95C:
324 case LP8788_TEMP_115C:
325 case LP8788_TEMP_135C:
326 return true;
327 default:
328 return false;
329 }
330}
331
332static int lp8727_battery_get_property(struct power_supply *psy,
333 enum power_supply_property psp,
334 union power_supply_propval *val)
335{
336 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
337 struct lp8727_platform_data *pdata = pchg->pdata;
338 enum lp8727_die_temp temp;
339 u8 read;
340
341 switch (psp) {
342 case POWER_SUPPLY_PROP_STATUS:
343 if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid)) {
344 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
345 return 0;
346 }
347
348 lp8727_read_byte(pchg, LP8727_STATUS1, &read);
349
350 val->intval = (read & LP8727_CHGSTAT) == LP8727_STAT_EOC ?
351 POWER_SUPPLY_STATUS_FULL :
352 POWER_SUPPLY_STATUS_CHARGING;
353 break;
354 case POWER_SUPPLY_PROP_HEALTH:
355 lp8727_read_byte(pchg, LP8727_STATUS2, &read);
356 temp = (read & LP8727_TEMP_STAT) >> LP8727_TEMP_SHIFT;
357
358 val->intval = lp8727_is_high_temperature(temp) ?
359 POWER_SUPPLY_HEALTH_OVERHEAT :
360 POWER_SUPPLY_HEALTH_GOOD;
361 break;
362 case POWER_SUPPLY_PROP_PRESENT:
363 if (!pdata)
364 return -EINVAL;
365
366 if (pdata->get_batt_present)
367 val->intval = pdata->get_batt_present();
368 break;
369 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
370 if (!pdata)
371 return -EINVAL;
372
373 if (pdata->get_batt_level)
374 val->intval = pdata->get_batt_level();
375 break;
376 case POWER_SUPPLY_PROP_CAPACITY:
377 if (!pdata)
378 return -EINVAL;
379
380 if (pdata->get_batt_capacity)
381 val->intval = pdata->get_batt_capacity();
382 break;
383 case POWER_SUPPLY_PROP_TEMP:
384 if (!pdata)
385 return -EINVAL;
386
387 if (pdata->get_batt_temp)
388 val->intval = pdata->get_batt_temp();
389 break;
390 default:
391 break;
392 }
393
394 return 0;
395}
396
397static void lp8727_charger_changed(struct power_supply *psy)
398{
399 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
400 u8 eoc_level;
401 u8 ichg;
402 u8 val;
403
404
405 if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid))
406 return;
407
408
409 if (pchg->chg_param) {
410 eoc_level = pchg->chg_param->eoc_level;
411 ichg = pchg->chg_param->ichg;
412 val = (ichg << LP8727_ICHG_SHIFT) | eoc_level;
413 lp8727_write_byte(pchg, LP8727_CHGCTRL2, val);
414 }
415}
416
417static const struct power_supply_desc lp8727_ac_desc = {
418 .name = "ac",
419 .type = POWER_SUPPLY_TYPE_MAINS,
420 .properties = lp8727_charger_prop,
421 .num_properties = ARRAY_SIZE(lp8727_charger_prop),
422 .get_property = lp8727_charger_get_property,
423};
424
425static const struct power_supply_desc lp8727_usb_desc = {
426 .name = "usb",
427 .type = POWER_SUPPLY_TYPE_USB,
428 .properties = lp8727_charger_prop,
429 .num_properties = ARRAY_SIZE(lp8727_charger_prop),
430 .get_property = lp8727_charger_get_property,
431};
432
433static const struct power_supply_desc lp8727_batt_desc = {
434 .name = "main_batt",
435 .type = POWER_SUPPLY_TYPE_BATTERY,
436 .properties = lp8727_battery_prop,
437 .num_properties = ARRAY_SIZE(lp8727_battery_prop),
438 .get_property = lp8727_battery_get_property,
439 .external_power_changed = lp8727_charger_changed,
440};
441
442static int lp8727_register_psy(struct lp8727_chg *pchg)
443{
444 struct power_supply_config psy_cfg = {};
445 struct lp8727_psy *psy;
446
447 psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
448 if (!psy)
449 return -ENOMEM;
450
451 pchg->psy = psy;
452
453 psy_cfg.supplied_to = battery_supplied_to;
454 psy_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
455
456 psy->ac = power_supply_register(pchg->dev, &lp8727_ac_desc, &psy_cfg);
457 if (IS_ERR(psy->ac))
458 goto err_psy_ac;
459
460 psy->usb = power_supply_register(pchg->dev, &lp8727_usb_desc,
461 &psy_cfg);
462 if (IS_ERR(psy->usb))
463 goto err_psy_usb;
464
465 psy->batt = power_supply_register(pchg->dev, &lp8727_batt_desc, NULL);
466 if (IS_ERR(psy->batt))
467 goto err_psy_batt;
468
469 return 0;
470
471err_psy_batt:
472 power_supply_unregister(psy->usb);
473err_psy_usb:
474 power_supply_unregister(psy->ac);
475err_psy_ac:
476 return -EPERM;
477}
478
479static void lp8727_unregister_psy(struct lp8727_chg *pchg)
480{
481 struct lp8727_psy *psy = pchg->psy;
482
483 if (!psy)
484 return;
485
486 power_supply_unregister(psy->ac);
487 power_supply_unregister(psy->usb);
488 power_supply_unregister(psy->batt);
489}
490
491#ifdef CONFIG_OF
492static struct lp8727_chg_param
493*lp8727_parse_charge_pdata(struct device *dev, struct device_node *np)
494{
495 struct lp8727_chg_param *param;
496
497 param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL);
498 if (!param)
499 goto out;
500
501 of_property_read_u8(np, "eoc-level", (u8 *)¶m->eoc_level);
502 of_property_read_u8(np, "charging-current", (u8 *)¶m->ichg);
503out:
504 return param;
505}
506
507static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev)
508{
509 struct device_node *np = dev->of_node;
510 struct device_node *child;
511 struct lp8727_platform_data *pdata;
512 const char *type;
513
514 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
515 if (!pdata)
516 return ERR_PTR(-ENOMEM);
517
518 of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec);
519
520
521 if (of_get_child_count(np) == 0)
522 return pdata;
523
524 for_each_child_of_node(np, child) {
525 of_property_read_string(child, "charger-type", &type);
526
527 if (!strcmp(type, "ac"))
528 pdata->ac = lp8727_parse_charge_pdata(dev, child);
529
530 if (!strcmp(type, "usb"))
531 pdata->usb = lp8727_parse_charge_pdata(dev, child);
532 }
533
534 return pdata;
535}
536#else
537static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev)
538{
539 return NULL;
540}
541#endif
542
543static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
544{
545 struct lp8727_chg *pchg;
546 struct lp8727_platform_data *pdata;
547 int ret;
548
549 if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
550 return -EIO;
551
552 if (cl->dev.of_node) {
553 pdata = lp8727_parse_dt(&cl->dev);
554 if (IS_ERR(pdata))
555 return PTR_ERR(pdata);
556 } else {
557 pdata = dev_get_platdata(&cl->dev);
558 }
559
560 pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
561 if (!pchg)
562 return -ENOMEM;
563
564 pchg->client = cl;
565 pchg->dev = &cl->dev;
566 pchg->pdata = pdata;
567 i2c_set_clientdata(cl, pchg);
568
569 mutex_init(&pchg->xfer_lock);
570
571 ret = lp8727_init_device(pchg);
572 if (ret) {
573 dev_err(pchg->dev, "i2c communication err: %d", ret);
574 return ret;
575 }
576
577 ret = lp8727_register_psy(pchg);
578 if (ret) {
579 dev_err(pchg->dev, "power supplies register err: %d", ret);
580 return ret;
581 }
582
583 ret = lp8727_setup_irq(pchg);
584 if (ret) {
585 dev_err(pchg->dev, "irq handler err: %d", ret);
586 lp8727_unregister_psy(pchg);
587 return ret;
588 }
589
590 return 0;
591}
592
593static int lp8727_remove(struct i2c_client *cl)
594{
595 struct lp8727_chg *pchg = i2c_get_clientdata(cl);
596
597 lp8727_release_irq(pchg);
598 lp8727_unregister_psy(pchg);
599 return 0;
600}
601
602static const struct of_device_id lp8727_dt_ids[] = {
603 { .compatible = "ti,lp8727", },
604 { }
605};
606MODULE_DEVICE_TABLE(of, lp8727_dt_ids);
607
608static const struct i2c_device_id lp8727_ids[] = {
609 {"lp8727", 0},
610 { }
611};
612MODULE_DEVICE_TABLE(i2c, lp8727_ids);
613
614static struct i2c_driver lp8727_driver = {
615 .driver = {
616 .name = "lp8727",
617 .of_match_table = of_match_ptr(lp8727_dt_ids),
618 },
619 .probe = lp8727_probe,
620 .remove = lp8727_remove,
621 .id_table = lp8727_ids,
622};
623module_i2c_driver(lp8727_driver);
624
625MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
626MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
627MODULE_LICENSE("GPL");
628
