Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

Linux/drivers/power/lp8727_charger.c

  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 
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 
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 
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 
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 
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 
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 
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 
178 static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
179 {
180         lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
181 }
182 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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
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 *)&param->eoc_level);
506         of_property_read_u8(np, "charging-current", (u8 *)&param->ichg);
507 out:
508         return param;
509 }
510 
511 static int 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         /* If charging parameter is not defined, just skip parsing the dt */
519         if (of_get_child_count(np) == 0)
520                 goto out;
521 
522         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
523         if (!pdata)
524                 return -ENOMEM;
525 
526         of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec);
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         dev->platform_data = pdata;
539 out:
540         return 0;
541 }
542 #else
543 static int lp8727_parse_dt(struct device *dev)
544 {
545         return 0;
546 }
547 #endif
548 
549 static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
550 {
551         struct lp8727_chg *pchg;
552         int ret;
553 
554         if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
555                 return -EIO;
556 
557         if (cl->dev.of_node) {
558                 ret = lp8727_parse_dt(&cl->dev);
559                 if (ret)
560                         return ret;
561         }
562 
563         pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
564         if (!pchg)
565                 return -ENOMEM;
566 
567         pchg->client = cl;
568         pchg->dev = &cl->dev;
569         pchg->pdata = cl->dev.platform_data;
570         i2c_set_clientdata(cl, pchg);
571 
572         mutex_init(&pchg->xfer_lock);
573 
574         ret = lp8727_init_device(pchg);
575         if (ret) {
576                 dev_err(pchg->dev, "i2c communication err: %d", ret);
577                 return ret;
578         }
579 
580         ret = lp8727_register_psy(pchg);
581         if (ret) {
582                 dev_err(pchg->dev, "power supplies register err: %d", ret);
583                 return ret;
584         }
585 
586         ret = lp8727_setup_irq(pchg);
587         if (ret) {
588                 dev_err(pchg->dev, "irq handler err: %d", ret);
589                 lp8727_unregister_psy(pchg);
590                 return ret;
591         }
592 
593         return 0;
594 }
595 
596 static int lp8727_remove(struct i2c_client *cl)
597 {
598         struct lp8727_chg *pchg = i2c_get_clientdata(cl);
599 
600         lp8727_release_irq(pchg);
601         lp8727_unregister_psy(pchg);
602         return 0;
603 }
604 
605 static const struct of_device_id lp8727_dt_ids[] = {
606         { .compatible = "ti,lp8727", },
607         { }
608 };
609 MODULE_DEVICE_TABLE(of, lp8727_dt_ids);
610 
611 static const struct i2c_device_id lp8727_ids[] = {
612         {"lp8727", 0},
613         { }
614 };
615 MODULE_DEVICE_TABLE(i2c, lp8727_ids);
616 
617 static struct i2c_driver lp8727_driver = {
618         .driver = {
619                    .name = "lp8727",
620                    .of_match_table = of_match_ptr(lp8727_dt_ids),
621                    },
622         .probe = lp8727_probe,
623         .remove = lp8727_remove,
624         .id_table = lp8727_ids,
625 };
626 module_i2c_driver(lp8727_driver);
627 
628 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
629 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
630 MODULE_LICENSE("GPL");
631 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us