1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for LP8727 Micro/Mini USB IC with integrated charger
4 *
5 * Copyright (C) 2011 Texas Instruments
6 * Copyright (C) 2011 National Semiconductor
7 */
8
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/* Registers */
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/* CTRL1 register */
31#define LP8727_CP_EN BIT(0)
32#define LP8727_ADC_EN BIT(1)
33#define LP8727_ID200_EN BIT(4)
34
35/* CTRL2 register */
36#define LP8727_CHGDET_EN BIT(1)
37#define LP8727_INT_EN BIT(6)
38
39/* SWCTRL register */
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/* INT1 register */
46#define LP8727_IDNO (0xF << 0)
47#define LP8727_VBUS BIT(4)
48
49/* STATUS1 register */
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/* STATUS2 register */
56#define LP8727_TEMP_STAT (3 << 5)
57#define LP8727_TEMP_SHIFT 5
58
59/* CHGCTRL2 register */
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 /* Charger Data */
92 enum lp8727_dev_id devid;
93 struct lp8727_chg_param *chg_param;
94
95 /* Interrupt Handling */
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(client: pchg->client, command: reg, length: len, values: data);
107 mutex_unlock(lock: &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, len: 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(client: pchg->client, command: reg, value: data);
123 mutex_unlock(lock: &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 /* clear interrupts */
145 ret = lp8727_read_bytes(pchg, LP8727_INT1, data: 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, data: val);
151 if (ret)
152 return ret;
153
154 val = LP8727_INT_EN | LP8727_CHGDET_EN;
155 return lp8727_write_byte(pchg, LP8727_CTRL2, data: 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, data: &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, data: &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, data: 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, sw: swctrl);
211}
212
213static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
214{
215 u8 val;
216
217 lp8727_read_byte(pchg, LP8727_CTRL2, data: &val);
218 val |= LP8727_CHGDET_EN;
219 lp8727_write_byte(pchg, LP8727_CTRL2, data: 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, data: 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, id: idno, vbusin: vbus);
239 lp8727_enable_chgdet(pchg);
240
241 power_supply_changed(psy: pchg->psy->ac);
242 power_supply_changed(psy: pchg->psy->usb);
243 power_supply_changed(psy: 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(dwork: &pchg->work, delay: 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, thread_fn: lp8727_isr_func,
269 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
270 name: "lp8727_irq", dev: pchg);
271
272 if (ret)
273 return ret;
274
275 pchg->irq = irq;
276 pchg->debounce_jiffies = msecs_to_jiffies(m: delay_msec);
277
278 return 0;
279}
280
281static void lp8727_release_irq(struct lp8727_chg *pchg)
282{
283 cancel_delayed_work_sync(dwork: &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(dev: psy->dev.parent);
311
312 if (psp != POWER_SUPPLY_PROP_ONLINE)
313 return -EINVAL;
314
315 val->intval = lp8727_is_charger_attached(name: psy->desc->name, id: 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(dev: 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(name: psy->desc->name, id: pchg->devid)) {
344 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
345 return 0;
346 }
347
348 lp8727_read_byte(pchg, LP8727_STATUS1, data: &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, data: &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(dev: psy->dev.parent);
400 u8 eoc_level;
401 u8 ichg;
402 u8 val;
403
404 /* skip if no charger exists */
405 if (!lp8727_is_charger_attached(name: psy->desc->name, id: pchg->devid))
406 return;
407
408 /* update charging parameters */
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, data: 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 = {}; /* Only for ac and usb */
445 struct lp8727_psy *psy;
446
447 psy = devm_kzalloc(dev: pchg->dev, size: 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 = devm_power_supply_register(parent: pchg->dev, desc: &lp8727_ac_desc, cfg: &psy_cfg);
457 if (IS_ERR(ptr: psy->ac))
458 return -EPERM;
459
460 psy->usb = devm_power_supply_register(parent: pchg->dev, desc: &lp8727_usb_desc,
461 cfg: &psy_cfg);
462 if (IS_ERR(ptr: psy->usb))
463 return -EPERM;
464
465 psy->batt = devm_power_supply_register(parent: pchg->dev, desc: &lp8727_batt_desc, NULL);
466 if (IS_ERR(ptr: psy->batt))
467 return -EPERM;
468
469 return 0;
470}
471
472#ifdef CONFIG_OF
473static struct lp8727_chg_param
474*lp8727_parse_charge_pdata(struct device *dev, struct device_node *np)
475{
476 struct lp8727_chg_param *param;
477
478 param = devm_kzalloc(dev, size: sizeof(*param), GFP_KERNEL);
479 if (!param)
480 goto out;
481
482 of_property_read_u8(np, propname: "eoc-level", out_value: (u8 *)&param->eoc_level);
483 of_property_read_u8(np, propname: "charging-current", out_value: (u8 *)&param->ichg);
484out:
485 return param;
486}
487
488static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev)
489{
490 struct device_node *np = dev->of_node;
491 struct device_node *child;
492 struct lp8727_platform_data *pdata;
493 const char *type;
494
495 pdata = devm_kzalloc(dev, size: sizeof(*pdata), GFP_KERNEL);
496 if (!pdata)
497 return ERR_PTR(error: -ENOMEM);
498
499 of_property_read_u32(np, propname: "debounce-ms", out_value: &pdata->debounce_msec);
500
501 /* If charging parameter is not defined, just skip parsing the dt */
502 if (of_get_child_count(np) == 0)
503 return pdata;
504
505 for_each_child_of_node(np, child) {
506 of_property_read_string(np: child, propname: "charger-type", out_string: &type);
507
508 if (!strcmp(type, "ac"))
509 pdata->ac = lp8727_parse_charge_pdata(dev, np: child);
510
511 if (!strcmp(type, "usb"))
512 pdata->usb = lp8727_parse_charge_pdata(dev, np: child);
513 }
514
515 return pdata;
516}
517#else
518static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev)
519{
520 return NULL;
521}
522#endif
523
524static int lp8727_probe(struct i2c_client *cl)
525{
526 struct lp8727_chg *pchg;
527 struct lp8727_platform_data *pdata;
528 int ret;
529
530 if (!i2c_check_functionality(adap: cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
531 return -EIO;
532
533 if (cl->dev.of_node) {
534 pdata = lp8727_parse_dt(dev: &cl->dev);
535 if (IS_ERR(ptr: pdata))
536 return PTR_ERR(ptr: pdata);
537 } else {
538 pdata = dev_get_platdata(dev: &cl->dev);
539 }
540
541 pchg = devm_kzalloc(dev: &cl->dev, size: sizeof(*pchg), GFP_KERNEL);
542 if (!pchg)
543 return -ENOMEM;
544
545 pchg->client = cl;
546 pchg->dev = &cl->dev;
547 pchg->pdata = pdata;
548 i2c_set_clientdata(client: cl, data: pchg);
549
550 mutex_init(&pchg->xfer_lock);
551
552 ret = lp8727_init_device(pchg);
553 if (ret) {
554 dev_err(pchg->dev, "i2c communication err: %d", ret);
555 return ret;
556 }
557
558 ret = lp8727_register_psy(pchg);
559 if (ret) {
560 dev_err(pchg->dev, "power supplies register err: %d", ret);
561 return ret;
562 }
563
564 ret = lp8727_setup_irq(pchg);
565 if (ret) {
566 dev_err(pchg->dev, "irq handler err: %d", ret);
567 return ret;
568 }
569
570 return 0;
571}
572
573static void lp8727_remove(struct i2c_client *cl)
574{
575 struct lp8727_chg *pchg = i2c_get_clientdata(client: cl);
576
577 lp8727_release_irq(pchg);
578}
579
580static const struct of_device_id lp8727_dt_ids[] __maybe_unused = {
581 { .compatible = "ti,lp8727", },
582 { }
583};
584MODULE_DEVICE_TABLE(of, lp8727_dt_ids);
585
586static const struct i2c_device_id lp8727_ids[] = {
587 { "lp8727" },
588 { }
589};
590MODULE_DEVICE_TABLE(i2c, lp8727_ids);
591
592static struct i2c_driver lp8727_driver = {
593 .driver = {
594 .name = "lp8727",
595 .of_match_table = of_match_ptr(lp8727_dt_ids),
596 },
597 .probe = lp8727_probe,
598 .remove = lp8727_remove,
599 .id_table = lp8727_ids,
600};
601module_i2c_driver(lp8727_driver);
602
603MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
604MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
605MODULE_LICENSE("GPL");
606

source code of linux/drivers/power/supply/lp8727_charger.c