1 /*
2 * Driver for LP8727 Micro/Mini USB IC with integrated charger
3 *
4 * Copyright (C) 2011 Texas Instruments
5 * Copyright (C) 2011 National Semiconductor
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/interrupt.h>
16 #include <linux/i2c.h>
17 #include <linux/power_supply.h>
18 #include <linux/platform_data/lp8727.h>
19 #include <linux/of.h>
20
21 #define LP8788_NUM_INTREGS 2
22 #define DEFAULT_DEBOUNCE_MSEC 270
23
24 /* Registers */
25 #define LP8727_CTRL1 0x1
26 #define LP8727_CTRL2 0x2
27 #define LP8727_SWCTRL 0x3
28 #define LP8727_INT1 0x4
29 #define LP8727_INT2 0x5
30 #define LP8727_STATUS1 0x6
31 #define LP8727_STATUS2 0x7
32 #define LP8727_CHGCTRL2 0x9
33
34 /* CTRL1 register */
35 #define LP8727_CP_EN BIT(0)
36 #define LP8727_ADC_EN BIT(1)
37 #define LP8727_ID200_EN BIT(4)
38
39 /* CTRL2 register */
40 #define LP8727_CHGDET_EN BIT(1)
41 #define LP8727_INT_EN BIT(6)
42
43 /* SWCTRL register */
44 #define LP8727_SW_DM1_DM (0x0 << 0)
45 #define LP8727_SW_DM1_HiZ (0x7 << 0)
46 #define LP8727_SW_DP2_DP (0x0 << 3)
47 #define LP8727_SW_DP2_HiZ (0x7 << 3)
48
49 /* INT1 register */
50 #define LP8727_IDNO (0xF << 0)
51 #define LP8727_VBUS BIT(4)
52
53 /* STATUS1 register */
54 #define LP8727_CHGSTAT (3 << 4)
55 #define LP8727_CHPORT BIT(6)
56 #define LP8727_DCPORT BIT(7)
57 #define LP8727_STAT_EOC 0x30
58
59 /* STATUS2 register */
60 #define LP8727_TEMP_STAT (3 << 5)
61 #define LP8727_TEMP_SHIFT 5
62
63 /* CHGCTRL2 register */
64 #define LP8727_ICHG_SHIFT 4
65
66 enum lp8727_dev_id {
67 LP8727_ID_NONE,
68 LP8727_ID_TA,
69 LP8727_ID_DEDICATED_CHG,
70 LP8727_ID_USB_CHG,
71 LP8727_ID_USB_DS,
72 LP8727_ID_MAX,
73 };
74
75 enum lp8727_die_temp {
76 LP8788_TEMP_75C,
77 LP8788_TEMP_95C,
78 LP8788_TEMP_115C,
79 LP8788_TEMP_135C,
80 };
81
82 struct lp8727_psy {
83 struct power_supply *ac;
84 struct power_supply *usb;
85 struct power_supply *batt;
86 };
87
88 struct lp8727_chg {
89 struct device *dev;
90 struct i2c_client *client;
91 struct mutex xfer_lock;
92 struct lp8727_psy *psy;
93 struct lp8727_platform_data *pdata;
94
95 /* Charger Data */
96 enum lp8727_dev_id devid;
97 struct lp8727_chg_param *chg_param;
98
99 /* Interrupt Handling */
100 int irq;
101 struct delayed_work work;
102 unsigned long debounce_jiffies;
103 };
104
lp8727_read_bytes(struct lp8727_chg * pchg,u8 reg,u8 * data,u8 len)105 static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
106 {
107 s32 ret;
108
109 mutex_lock(&pchg->xfer_lock);
110 ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
111 mutex_unlock(&pchg->xfer_lock);
112
113 return (ret != len) ? -EIO : 0;
114 }
115
lp8727_read_byte(struct lp8727_chg * pchg,u8 reg,u8 * data)116 static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data)
117 {
118 return lp8727_read_bytes(pchg, reg, data, 1);
119 }
120
lp8727_write_byte(struct lp8727_chg * pchg,u8 reg,u8 data)121 static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
122 {
123 int ret;
124
125 mutex_lock(&pchg->xfer_lock);
126 ret = i2c_smbus_write_byte_data(pchg->client, reg, data);
127 mutex_unlock(&pchg->xfer_lock);
128
129 return ret;
130 }
131
lp8727_is_charger_attached(const char * name,int id)132 static bool lp8727_is_charger_attached(const char *name, int id)
133 {
134 if (!strcmp(name, "ac"))
135 return id == LP8727_ID_TA || id == LP8727_ID_DEDICATED_CHG;
136 else if (!strcmp(name, "usb"))
137 return id == LP8727_ID_USB_CHG;
138
139 return id >= LP8727_ID_TA && id <= LP8727_ID_USB_CHG;
140 }
141
lp8727_init_device(struct lp8727_chg * pchg)142 static int lp8727_init_device(struct lp8727_chg *pchg)
143 {
144 u8 val;
145 int ret;
146 u8 intstat[LP8788_NUM_INTREGS];
147
148 /* clear interrupts */
149 ret = lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS);
150 if (ret)
151 return ret;
152
153 val = LP8727_ID200_EN | LP8727_ADC_EN | LP8727_CP_EN;
154 ret = lp8727_write_byte(pchg, LP8727_CTRL1, val);
155 if (ret)
156 return ret;
157
158 val = LP8727_INT_EN | LP8727_CHGDET_EN;
159 return lp8727_write_byte(pchg, LP8727_CTRL2, val);
160 }
161
lp8727_is_dedicated_charger(struct lp8727_chg * pchg)162 static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
163 {
164 u8 val;
165
166 lp8727_read_byte(pchg, LP8727_STATUS1, &val);
167 return val & LP8727_DCPORT;
168 }
169
lp8727_is_usb_charger(struct lp8727_chg * pchg)170 static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
171 {
172 u8 val;
173
174 lp8727_read_byte(pchg, LP8727_STATUS1, &val);
175 return val & LP8727_CHPORT;
176 }
177
lp8727_ctrl_switch(struct lp8727_chg * pchg,u8 sw)178 static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
179 {
180 lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
181 }
182
lp8727_id_detection(struct lp8727_chg * pchg,u8 id,int vbusin)183 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
184 {
185 struct lp8727_platform_data *pdata = pchg->pdata;
186 u8 devid = LP8727_ID_NONE;
187 u8 swctrl = LP8727_SW_DM1_HiZ | LP8727_SW_DP2_HiZ;
188
189 switch (id) {
190 case 0x5:
191 devid = LP8727_ID_TA;
192 pchg->chg_param = pdata ? pdata->ac : NULL;
193 break;
194 case 0xB:
195 if (lp8727_is_dedicated_charger(pchg)) {
196 pchg->chg_param = pdata ? pdata->ac : NULL;
197 devid = LP8727_ID_DEDICATED_CHG;
198 } else if (lp8727_is_usb_charger(pchg)) {
199 pchg->chg_param = pdata ? pdata->usb : NULL;
200 devid = LP8727_ID_USB_CHG;
201 swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
202 } else if (vbusin) {
203 devid = LP8727_ID_USB_DS;
204 swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
205 }
206 break;
207 default:
208 devid = LP8727_ID_NONE;
209 pchg->chg_param = NULL;
210 break;
211 }
212
213 pchg->devid = devid;
214 lp8727_ctrl_switch(pchg, swctrl);
215 }
216
lp8727_enable_chgdet(struct lp8727_chg * pchg)217 static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
218 {
219 u8 val;
220
221 lp8727_read_byte(pchg, LP8727_CTRL2, &val);
222 val |= LP8727_CHGDET_EN;
223 lp8727_write_byte(pchg, LP8727_CTRL2, val);
224 }
225
lp8727_delayed_func(struct work_struct * _work)226 static void lp8727_delayed_func(struct work_struct *_work)
227 {
228 struct lp8727_chg *pchg = container_of(_work, struct lp8727_chg,
229 work.work);
230 u8 intstat[LP8788_NUM_INTREGS];
231 u8 idno;
232 u8 vbus;
233
234 if (lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS)) {
235 dev_err(pchg->dev, "can not read INT registers\n");
236 return;
237 }
238
239 idno = intstat[0] & LP8727_IDNO;
240 vbus = intstat[0] & LP8727_VBUS;
241
242 lp8727_id_detection(pchg, idno, vbus);
243 lp8727_enable_chgdet(pchg);
244
245 power_supply_changed(pchg->psy->ac);
246 power_supply_changed(pchg->psy->usb);
247 power_supply_changed(pchg->psy->batt);
248 }
249
lp8727_isr_func(int irq,void * ptr)250 static irqreturn_t lp8727_isr_func(int irq, void *ptr)
251 {
252 struct lp8727_chg *pchg = ptr;
253
254 schedule_delayed_work(&pchg->work, pchg->debounce_jiffies);
255 return IRQ_HANDLED;
256 }
257
lp8727_setup_irq(struct lp8727_chg * pchg)258 static int lp8727_setup_irq(struct lp8727_chg *pchg)
259 {
260 int ret;
261 int irq = pchg->client->irq;
262 unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
263 DEFAULT_DEBOUNCE_MSEC;
264
265 INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
266
267 if (irq <= 0) {
268 dev_warn(pchg->dev, "invalid irq number: %d\n", irq);
269 return 0;
270 }
271
272 ret = request_threaded_irq(irq, NULL, lp8727_isr_func,
273 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
274 "lp8727_irq", pchg);
275
276 if (ret)
277 return ret;
278
279 pchg->irq = irq;
280 pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);
281
282 return 0;
283 }
284
lp8727_release_irq(struct lp8727_chg * pchg)285 static void lp8727_release_irq(struct lp8727_chg *pchg)
286 {
287 cancel_delayed_work_sync(&pchg->work);
288
289 if (pchg->irq)
290 free_irq(pchg->irq, pchg);
291 }
292
293 static enum power_supply_property lp8727_charger_prop[] = {
294 POWER_SUPPLY_PROP_ONLINE,
295 };
296
297 static enum power_supply_property lp8727_battery_prop[] = {
298 POWER_SUPPLY_PROP_STATUS,
299 POWER_SUPPLY_PROP_HEALTH,
300 POWER_SUPPLY_PROP_PRESENT,
301 POWER_SUPPLY_PROP_VOLTAGE_NOW,
302 POWER_SUPPLY_PROP_CAPACITY,
303 POWER_SUPPLY_PROP_TEMP,
304 };
305
306 static char *battery_supplied_to[] = {
307 "main_batt",
308 };
309
lp8727_charger_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)310 static int lp8727_charger_get_property(struct power_supply *psy,
311 enum power_supply_property psp,
312 union power_supply_propval *val)
313 {
314 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
315
316 if (psp != POWER_SUPPLY_PROP_ONLINE)
317 return -EINVAL;
318
319 val->intval = lp8727_is_charger_attached(psy->desc->name, pchg->devid);
320
321 return 0;
322 }
323
lp8727_is_high_temperature(enum lp8727_die_temp temp)324 static bool lp8727_is_high_temperature(enum lp8727_die_temp temp)
325 {
326 switch (temp) {
327 case LP8788_TEMP_95C:
328 case LP8788_TEMP_115C:
329 case LP8788_TEMP_135C:
330 return true;
331 default:
332 return false;
333 }
334 }
335
lp8727_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)336 static int lp8727_battery_get_property(struct power_supply *psy,
337 enum power_supply_property psp,
338 union power_supply_propval *val)
339 {
340 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
341 struct lp8727_platform_data *pdata = pchg->pdata;
342 enum lp8727_die_temp temp;
343 u8 read;
344
345 switch (psp) {
346 case POWER_SUPPLY_PROP_STATUS:
347 if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid)) {
348 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
349 return 0;
350 }
351
352 lp8727_read_byte(pchg, LP8727_STATUS1, &read);
353
354 val->intval = (read & LP8727_CHGSTAT) == LP8727_STAT_EOC ?
355 POWER_SUPPLY_STATUS_FULL :
356 POWER_SUPPLY_STATUS_CHARGING;
357 break;
358 case POWER_SUPPLY_PROP_HEALTH:
359 lp8727_read_byte(pchg, LP8727_STATUS2, &read);
360 temp = (read & LP8727_TEMP_STAT) >> LP8727_TEMP_SHIFT;
361
362 val->intval = lp8727_is_high_temperature(temp) ?
363 POWER_SUPPLY_HEALTH_OVERHEAT :
364 POWER_SUPPLY_HEALTH_GOOD;
365 break;
366 case POWER_SUPPLY_PROP_PRESENT:
367 if (!pdata)
368 return -EINVAL;
369
370 if (pdata->get_batt_present)
371 val->intval = pdata->get_batt_present();
372 break;
373 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
374 if (!pdata)
375 return -EINVAL;
376
377 if (pdata->get_batt_level)
378 val->intval = pdata->get_batt_level();
379 break;
380 case POWER_SUPPLY_PROP_CAPACITY:
381 if (!pdata)
382 return -EINVAL;
383
384 if (pdata->get_batt_capacity)
385 val->intval = pdata->get_batt_capacity();
386 break;
387 case POWER_SUPPLY_PROP_TEMP:
388 if (!pdata)
389 return -EINVAL;
390
391 if (pdata->get_batt_temp)
392 val->intval = pdata->get_batt_temp();
393 break;
394 default:
395 break;
396 }
397
398 return 0;
399 }
400
lp8727_charger_changed(struct power_supply * psy)401 static void lp8727_charger_changed(struct power_supply *psy)
402 {
403 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
404 u8 eoc_level;
405 u8 ichg;
406 u8 val;
407
408 /* skip if no charger exists */
409 if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid))
410 return;
411
412 /* update charging parameters */
413 if (pchg->chg_param) {
414 eoc_level = pchg->chg_param->eoc_level;
415 ichg = pchg->chg_param->ichg;
416 val = (ichg << LP8727_ICHG_SHIFT) | eoc_level;
417 lp8727_write_byte(pchg, LP8727_CHGCTRL2, val);
418 }
419 }
420
421 static const struct power_supply_desc lp8727_ac_desc = {
422 .name = "ac",
423 .type = POWER_SUPPLY_TYPE_MAINS,
424 .properties = lp8727_charger_prop,
425 .num_properties = ARRAY_SIZE(lp8727_charger_prop),
426 .get_property = lp8727_charger_get_property,
427 };
428
429 static const struct power_supply_desc lp8727_usb_desc = {
430 .name = "usb",
431 .type = POWER_SUPPLY_TYPE_USB,
432 .properties = lp8727_charger_prop,
433 .num_properties = ARRAY_SIZE(lp8727_charger_prop),
434 .get_property = lp8727_charger_get_property,
435 };
436
437 static const struct power_supply_desc lp8727_batt_desc = {
438 .name = "main_batt",
439 .type = POWER_SUPPLY_TYPE_BATTERY,
440 .properties = lp8727_battery_prop,
441 .num_properties = ARRAY_SIZE(lp8727_battery_prop),
442 .get_property = lp8727_battery_get_property,
443 .external_power_changed = lp8727_charger_changed,
444 };
445
lp8727_register_psy(struct lp8727_chg * pchg)446 static int lp8727_register_psy(struct lp8727_chg *pchg)
447 {
448 struct power_supply_config psy_cfg = {}; /* Only for ac and usb */
449 struct lp8727_psy *psy;
450
451 psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
452 if (!psy)
453 return -ENOMEM;
454
455 pchg->psy = psy;
456
457 psy_cfg.supplied_to = battery_supplied_to;
458 psy_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
459
460 psy->ac = power_supply_register(pchg->dev, &lp8727_ac_desc, &psy_cfg);
461 if (IS_ERR(psy->ac))
462 goto err_psy_ac;
463
464 psy->usb = power_supply_register(pchg->dev, &lp8727_usb_desc,
465 &psy_cfg);
466 if (IS_ERR(psy->usb))
467 goto err_psy_usb;
468
469 psy->batt = power_supply_register(pchg->dev, &lp8727_batt_desc, NULL);
470 if (IS_ERR(psy->batt))
471 goto err_psy_batt;
472
473 return 0;
474
475 err_psy_batt:
476 power_supply_unregister(psy->usb);
477 err_psy_usb:
478 power_supply_unregister(psy->ac);
479 err_psy_ac:
480 return -EPERM;
481 }
482
lp8727_unregister_psy(struct lp8727_chg * pchg)483 static void lp8727_unregister_psy(struct lp8727_chg *pchg)
484 {
485 struct lp8727_psy *psy = pchg->psy;
486
487 if (!psy)
488 return;
489
490 power_supply_unregister(psy->ac);
491 power_supply_unregister(psy->usb);
492 power_supply_unregister(psy->batt);
493 }
494
495 #ifdef CONFIG_OF
496 static struct lp8727_chg_param
lp8727_parse_charge_pdata(struct device * dev,struct device_node * np)497 *lp8727_parse_charge_pdata(struct device *dev, struct device_node *np)
498 {
499 struct lp8727_chg_param *param;
500
501 param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL);
502 if (!param)
503 goto out;
504
505 of_property_read_u8(np, "eoc-level", (u8 *)¶m->eoc_level);
506 of_property_read_u8(np, "charging-current", (u8 *)¶m->ichg);
507 out:
508 return param;
509 }
510
lp8727_parse_dt(struct device * dev)511 static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev)
512 {
513 struct device_node *np = dev->of_node;
514 struct device_node *child;
515 struct lp8727_platform_data *pdata;
516 const char *type;
517
518 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
519 if (!pdata)
520 return ERR_PTR(-ENOMEM);
521
522 of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec);
523
524 /* If charging parameter is not defined, just skip parsing the dt */
525 if (of_get_child_count(np) == 0)
526 return pdata;
527
528 for_each_child_of_node(np, child) {
529 of_property_read_string(child, "charger-type", &type);
530
531 if (!strcmp(type, "ac"))
532 pdata->ac = lp8727_parse_charge_pdata(dev, child);
533
534 if (!strcmp(type, "usb"))
535 pdata->usb = lp8727_parse_charge_pdata(dev, child);
536 }
537
538 return pdata;
539 }
540 #else
lp8727_parse_dt(struct device * dev)541 static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev)
542 {
543 return NULL;
544 }
545 #endif
546
lp8727_probe(struct i2c_client * cl,const struct i2c_device_id * id)547 static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
548 {
549 struct lp8727_chg *pchg;
550 struct lp8727_platform_data *pdata;
551 int ret;
552
553 if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
554 return -EIO;
555
556 if (cl->dev.of_node) {
557 pdata = lp8727_parse_dt(&cl->dev);
558 if (IS_ERR(pdata))
559 return PTR_ERR(pdata);
560 } else {
561 pdata = dev_get_platdata(&cl->dev);
562 }
563
564 pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
565 if (!pchg)
566 return -ENOMEM;
567
568 pchg->client = cl;
569 pchg->dev = &cl->dev;
570 pchg->pdata = pdata;
571 i2c_set_clientdata(cl, pchg);
572
573 mutex_init(&pchg->xfer_lock);
574
575 ret = lp8727_init_device(pchg);
576 if (ret) {
577 dev_err(pchg->dev, "i2c communication err: %d", ret);
578 return ret;
579 }
580
581 ret = lp8727_register_psy(pchg);
582 if (ret) {
583 dev_err(pchg->dev, "power supplies register err: %d", ret);
584 return ret;
585 }
586
587 ret = lp8727_setup_irq(pchg);
588 if (ret) {
589 dev_err(pchg->dev, "irq handler err: %d", ret);
590 lp8727_unregister_psy(pchg);
591 return ret;
592 }
593
594 return 0;
595 }
596
lp8727_remove(struct i2c_client * cl)597 static int lp8727_remove(struct i2c_client *cl)
598 {
599 struct lp8727_chg *pchg = i2c_get_clientdata(cl);
600
601 lp8727_release_irq(pchg);
602 lp8727_unregister_psy(pchg);
603 return 0;
604 }
605
606 static const struct of_device_id lp8727_dt_ids[] = {
607 { .compatible = "ti,lp8727", },
608 { }
609 };
610 MODULE_DEVICE_TABLE(of, lp8727_dt_ids);
611
612 static const struct i2c_device_id lp8727_ids[] = {
613 {"lp8727", 0},
614 { }
615 };
616 MODULE_DEVICE_TABLE(i2c, lp8727_ids);
617
618 static struct i2c_driver lp8727_driver = {
619 .driver = {
620 .name = "lp8727",
621 .of_match_table = of_match_ptr(lp8727_dt_ids),
622 },
623 .probe = lp8727_probe,
624 .remove = lp8727_remove,
625 .id_table = lp8727_ids,
626 };
627 module_i2c_driver(lp8727_driver);
628
629 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
630 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
631 MODULE_LICENSE("GPL");
632