drivers/power/supply/lp8727_charger.c

   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
  62 enum 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
  71 enum lp8727_die_temp {
  72         LP8788_TEMP_75C,
  73         LP8788_TEMP_95C,
  74         LP8788_TEMP_115C,
  75         LP8788_TEMP_135C,
  76 };
  77
  78 struct lp8727_psy {
  79         struct power_supply *ac;
  80         struct power_supply *usb;
  81         struct power_supply *batt;
  82 };
  83
  84 struct 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
 101 static 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
 112 static 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
 117 static 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
 128 static 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
 138 static 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, 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
 158 static 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
 166 static 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
 174 static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
 175 {
 176         lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
 177 }
 178
 179 static 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
 213 static 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
 222 static 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
 246 static 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
 254 static 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
 281 static 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
 289 static enum power_supply_property lp8727_charger_prop[] = {
 290         POWER_SUPPLY_PROP_ONLINE,
 291 };
 292
 293 static 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
 302 static char *battery_supplied_to[] = {
 303         "main_batt",
 304 };
 305
 306 static 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
 320 static 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
 332 static 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
 397 static 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         /* skip if no charger exists */
 405         if (!lp8727_is_charger_attached(psy->desc->name, 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, val);
 414         }
 415 }
 416
 417 static 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
 425 static 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
 433 static 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
 442 static 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(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 = devm_power_supply_register(pchg->dev, &lp8727_ac_desc, &psy_cfg);
 457         if (IS_ERR(psy->ac))
 458                 return -EPERM;
 459
 460         psy->usb = devm_power_supply_register(pchg->dev, &lp8727_usb_desc,
 461                                               &psy_cfg);
 462         if (IS_ERR(psy->usb))
 463                 return -EPERM;
 464
 465         psy->batt = devm_power_supply_register(pchg->dev, &lp8727_batt_desc, NULL);
 466         if (IS_ERR(psy->batt))
 467                 return -EPERM;
 468
 469         return 0;
 470 }
 471
 472 #ifdef CONFIG_OF
 473 static 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, sizeof(*param), GFP_KERNEL);
 479         if (!param)
 480                 goto out;
 481
 482         of_property_read_u8(np, "eoc-level", (u8 *)&param->eoc_level);
 483         of_property_read_u8(np, "charging-current", (u8 *)&param->ichg);
 484 out:
 485         return param;
 486 }
 487
 488 static 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, sizeof(*pdata), GFP_KERNEL);
 496         if (!pdata)
 497                 return ERR_PTR(-ENOMEM);
 498
 499         of_property_read_u32(np, "debounce-ms", &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(child, "charger-type", &type);
 507
 508                 if (!strcmp(type, "ac"))
 509                         pdata->ac = lp8727_parse_charge_pdata(dev, child);
 510
 511                 if (!strcmp(type, "usb"))
 512                         pdata->usb = lp8727_parse_charge_pdata(dev, child);
 513         }
 514
 515         return pdata;
 516 }
 517 #else
 518 static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev)
 519 {
 520         return NULL;
 521 }
 522 #endif
 523
 524 static 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(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
 531                 return -EIO;
 532
 533         if (cl->dev.of_node) {
 534                 pdata = lp8727_parse_dt(&cl->dev);
 535                 if (IS_ERR(pdata))
 536                         return PTR_ERR(pdata);
 537         } else {
 538                 pdata = dev_get_platdata(&cl->dev);
 539         }
 540
 541         pchg = devm_kzalloc(&cl->dev, 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(cl, 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
 573 static void lp8727_remove(struct i2c_client *cl)
 574 {
 575         struct lp8727_chg *pchg = i2c_get_clientdata(cl);
 576
 577         lp8727_release_irq(pchg);
 578 }
 579
 580 static const struct of_device_id lp8727_dt_ids[] __maybe_unused = {
 581         { .compatible = "ti,lp8727", },
 582         { }
 583 };
 584 MODULE_DEVICE_TABLE(of, lp8727_dt_ids);
 585
 586 static const struct i2c_device_id lp8727_ids[] = {
 587         {"lp8727", 0},
 588         { }
 589 };
 590 MODULE_DEVICE_TABLE(i2c, lp8727_ids);
 591
 592 static 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 };
 601 module_i2c_driver(lp8727_driver);
 602
 603 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
 604 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
 605 MODULE_LICENSE("GPL");