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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->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->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->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 int lp8727_register_psy(struct lp8727_chg *pchg)
422 {
423         struct lp8727_psy *psy;
424 
425         psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
426         if (!psy)
427                 return -ENOMEM;
428 
429         pchg->psy = psy;
430 
431         psy->ac.name = "ac";
432         psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
433         psy->ac.properties = lp8727_charger_prop;
434         psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
435         psy->ac.get_property = lp8727_charger_get_property;
436         psy->ac.supplied_to = battery_supplied_to;
437         psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
438 
439         if (power_supply_register(pchg->dev, &psy->ac))
440                 goto err_psy_ac;
441 
442         psy->usb.name = "usb";
443         psy->usb.type = POWER_SUPPLY_TYPE_USB;
444         psy->usb.properties = lp8727_charger_prop;
445         psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
446         psy->usb.get_property = lp8727_charger_get_property;
447         psy->usb.supplied_to = battery_supplied_to;
448         psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
449 
450         if (power_supply_register(pchg->dev, &psy->usb))
451                 goto err_psy_usb;
452 
453         psy->batt.name = "main_batt";
454         psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
455         psy->batt.properties = lp8727_battery_prop;
456         psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
457         psy->batt.get_property = lp8727_battery_get_property;
458         psy->batt.external_power_changed = lp8727_charger_changed;
459 
460         if (power_supply_register(pchg->dev, &psy->batt))
461                 goto err_psy_batt;
462 
463         return 0;
464 
465 err_psy_batt:
466         power_supply_unregister(&psy->usb);
467 err_psy_usb:
468         power_supply_unregister(&psy->ac);
469 err_psy_ac:
470         return -EPERM;
471 }
472 
473 static void lp8727_unregister_psy(struct lp8727_chg *pchg)
474 {
475         struct lp8727_psy *psy = pchg->psy;
476 
477         if (!psy)
478                 return;
479 
480         power_supply_unregister(&psy->ac);
481         power_supply_unregister(&psy->usb);
482         power_supply_unregister(&psy->batt);
483 }
484 
485 #ifdef CONFIG_OF
486 static struct lp8727_chg_param
487 *lp8727_parse_charge_pdata(struct device *dev, struct device_node *np)
488 {
489         struct lp8727_chg_param *param;
490 
491         param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL);
492         if (!param)
493                 goto out;
494 
495         of_property_read_u8(np, "eoc-level", (u8 *)&param->eoc_level);
496         of_property_read_u8(np, "charging-current", (u8 *)&param->ichg);
497 out:
498         return param;
499 }
500 
501 static int lp8727_parse_dt(struct device *dev)
502 {
503         struct device_node *np = dev->of_node;
504         struct device_node *child;
505         struct lp8727_platform_data *pdata;
506         const char *type;
507 
508         /* If charging parameter is not defined, just skip parsing the dt */
509         if (of_get_child_count(np) == 0)
510                 goto out;
511 
512         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
513         if (!pdata)
514                 return -ENOMEM;
515 
516         of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec);
517 
518         for_each_child_of_node(np, child) {
519                 of_property_read_string(child, "charger-type", &type);
520 
521                 if (!strcmp(type, "ac"))
522                         pdata->ac = lp8727_parse_charge_pdata(dev, child);
523 
524                 if (!strcmp(type, "usb"))
525                         pdata->usb = lp8727_parse_charge_pdata(dev, child);
526         }
527 
528         dev->platform_data = pdata;
529 out:
530         return 0;
531 }
532 #else
533 static int lp8727_parse_dt(struct device *dev)
534 {
535         return 0;
536 }
537 #endif
538 
539 static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
540 {
541         struct lp8727_chg *pchg;
542         int ret;
543 
544         if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
545                 return -EIO;
546 
547         if (cl->dev.of_node) {
548                 ret = lp8727_parse_dt(&cl->dev);
549                 if (ret)
550                         return ret;
551         }
552 
553         pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
554         if (!pchg)
555                 return -ENOMEM;
556 
557         pchg->client = cl;
558         pchg->dev = &cl->dev;
559         pchg->pdata = cl->dev.platform_data;
560         i2c_set_clientdata(cl, pchg);
561 
562         mutex_init(&pchg->xfer_lock);
563 
564         ret = lp8727_init_device(pchg);
565         if (ret) {
566                 dev_err(pchg->dev, "i2c communication err: %d", ret);
567                 return ret;
568         }
569 
570         ret = lp8727_register_psy(pchg);
571         if (ret) {
572                 dev_err(pchg->dev, "power supplies register err: %d", ret);
573                 return ret;
574         }
575 
576         ret = lp8727_setup_irq(pchg);
577         if (ret) {
578                 dev_err(pchg->dev, "irq handler err: %d", ret);
579                 lp8727_unregister_psy(pchg);
580                 return ret;
581         }
582 
583         return 0;
584 }
585 
586 static int lp8727_remove(struct i2c_client *cl)
587 {
588         struct lp8727_chg *pchg = i2c_get_clientdata(cl);
589 
590         lp8727_release_irq(pchg);
591         lp8727_unregister_psy(pchg);
592         return 0;
593 }
594 
595 static const struct of_device_id lp8727_dt_ids[] = {
596         { .compatible = "ti,lp8727", },
597         { }
598 };
599 MODULE_DEVICE_TABLE(of, lp8727_dt_ids);
600 
601 static const struct i2c_device_id lp8727_ids[] = {
602         {"lp8727", 0},
603         { }
604 };
605 MODULE_DEVICE_TABLE(i2c, lp8727_ids);
606 
607 static struct i2c_driver lp8727_driver = {
608         .driver = {
609                    .name = "lp8727",
610                    .of_match_table = of_match_ptr(lp8727_dt_ids),
611                    },
612         .probe = lp8727_probe,
613         .remove = lp8727_remove,
614         .id_table = lp8727_ids,
615 };
616 module_i2c_driver(lp8727_driver);
617 
618 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
619 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
620 MODULE_LICENSE("GPL");
621 

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