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
  20 #define LP8788_NUM_INTREGS      2
  21 #define DEFAULT_DEBOUNCE_MSEC   270
  22
  23 /* Registers */
  24 #define LP8727_CTRL1            0x1
  25 #define LP8727_CTRL2            0x2
  26 #define LP8727_SWCTRL           0x3
  27 #define LP8727_INT1             0x4
  28 #define LP8727_INT2             0x5
  29 #define LP8727_STATUS1          0x6
  30 #define LP8727_STATUS2          0x7
  31 #define LP8727_CHGCTRL2         0x9
  32
  33 /* CTRL1 register */
  34 #define LP8727_CP_EN            BIT(0)
  35 #define LP8727_ADC_EN           BIT(1)
  36 #define LP8727_ID200_EN         BIT(4)
  37
  38 /* CTRL2 register */
  39 #define LP8727_CHGDET_EN        BIT(1)
  40 #define LP8727_INT_EN           BIT(6)
  41
  42 /* SWCTRL register */
  43 #define LP8727_SW_DM1_DM        (0x0 << 0)
  44 #define LP8727_SW_DM1_HiZ       (0x7 << 0)
  45 #define LP8727_SW_DP2_DP        (0x0 << 3)
  46 #define LP8727_SW_DP2_HiZ       (0x7 << 3)
  47
  48 /* INT1 register */
  49 #define LP8727_IDNO             (0xF << 0)
  50 #define LP8727_VBUS             BIT(4)
  51
  52 /* STATUS1 register */
  53 #define LP8727_CHGSTAT          (3 << 4)
  54 #define LP8727_CHPORT           BIT(6)
  55 #define LP8727_DCPORT           BIT(7)
  56 #define LP8727_STAT_EOC         0x30
  57
  58 /* STATUS2 register */
  59 #define LP8727_TEMP_STAT        (3 << 5)
  60 #define LP8727_TEMP_SHIFT       5
  61
  62 /* CHGCTRL2 register */
  63 #define LP8727_ICHG_SHIFT       4
  64
  65 enum lp8727_dev_id {
  66         LP8727_ID_NONE,
  67         LP8727_ID_TA,
  68         LP8727_ID_DEDICATED_CHG,
  69         LP8727_ID_USB_CHG,
  70         LP8727_ID_USB_DS,
  71         LP8727_ID_MAX,
  72 };
  73
  74 enum lp8727_die_temp {
  75         LP8788_TEMP_75C,
  76         LP8788_TEMP_95C,
  77         LP8788_TEMP_115C,
  78         LP8788_TEMP_135C,
  79 };
  80
  81 struct lp8727_psy {
  82         struct power_supply ac;
  83         struct power_supply usb;
  84         struct power_supply batt;
  85 };
  86
  87 struct lp8727_chg {
  88         struct device *dev;
  89         struct i2c_client *client;
  90         struct mutex xfer_lock;
  91         struct delayed_work work;
  92         struct lp8727_platform_data *pdata;
  93         struct lp8727_psy *psy;
  94         struct lp8727_chg_param *chg_parm;
  95         enum lp8727_dev_id devid;
  96         unsigned long debounce_jiffies;
  97         int irq;
  98 };
  99
 100 static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
 101 {
 102         s32 ret;
 103
 104         mutex_lock(&pchg->xfer_lock);
 105         ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
 106         mutex_unlock(&pchg->xfer_lock);
 107
 108         return (ret != len) ? -EIO : 0;
 109 }
 110
 111 static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data)
 112 {
 113         return lp8727_read_bytes(pchg, reg, data, 1);
 114 }
 115
 116 static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
 117 {
 118         int ret;
 119
 120         mutex_lock(&pchg->xfer_lock);
 121         ret = i2c_smbus_write_byte_data(pchg->client, reg, data);
 122         mutex_unlock(&pchg->xfer_lock);
 123
 124         return ret;
 125 }
 126
 127 static bool lp8727_is_charger_attached(const char *name, int id)
 128 {
 129         if (!strcmp(name, "ac"))
 130                 return id == LP8727_ID_TA || id == LP8727_ID_DEDICATED_CHG;
 131         else if (!strcmp(name, "usb"))
 132                 return id == LP8727_ID_USB_CHG;
 133
 134         return id >= LP8727_ID_TA && id <= LP8727_ID_USB_CHG;
 135 }
 136
 137 static int lp8727_init_device(struct lp8727_chg *pchg)
 138 {
 139         u8 val;
 140         int ret;
 141         u8 intstat[LP8788_NUM_INTREGS];
 142
 143         /* clear interrupts */
 144         ret = lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS);
 145         if (ret)
 146                 return ret;
 147
 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         lp8727_read_byte(pchg, LP8727_STATUS1, &val);
 162         return val & LP8727_DCPORT;
 163 }
 164
 165 static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
 166 {
 167         u8 val;
 168         lp8727_read_byte(pchg, LP8727_STATUS1, &val);
 169         return val & LP8727_CHPORT;
 170 }
 171
 172 static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
 173 {
 174         lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
 175 }
 176
 177 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
 178 {
 179         struct lp8727_platform_data *pdata = pchg->pdata;
 180         u8 devid = LP8727_ID_NONE;
 181         u8 swctrl = LP8727_SW_DM1_HiZ | LP8727_SW_DP2_HiZ;
 182
 183         switch (id) {
 184         case 0x5:
 185                 devid = LP8727_ID_TA;
 186                 pchg->chg_parm = pdata ? pdata->ac : NULL;
 187                 break;
 188         case 0xB:
 189                 if (lp8727_is_dedicated_charger(pchg)) {
 190                         pchg->chg_parm = pdata ? pdata->ac : NULL;
 191                         devid = LP8727_ID_DEDICATED_CHG;
 192                 } else if (lp8727_is_usb_charger(pchg)) {
 193                         pchg->chg_parm = pdata ? pdata->usb : NULL;
 194                         devid = LP8727_ID_USB_CHG;
 195                         swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
 196                 } else if (vbusin) {
 197                         devid = LP8727_ID_USB_DS;
 198                         swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
 199                 }
 200                 break;
 201         default:
 202                 devid = LP8727_ID_NONE;
 203                 pchg->chg_parm = NULL;
 204                 break;
 205         }
 206
 207         pchg->devid = devid;
 208         lp8727_ctrl_switch(pchg, swctrl);
 209 }
 210
 211 static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
 212 {
 213         u8 val;
 214
 215         lp8727_read_byte(pchg, LP8727_CTRL2, &val);
 216         val |= LP8727_CHGDET_EN;
 217         lp8727_write_byte(pchg, LP8727_CTRL2, val);
 218 }
 219
 220 static void lp8727_delayed_func(struct work_struct *_work)
 221 {
 222         struct lp8727_chg *pchg = container_of(_work, struct lp8727_chg,
 223                                                 work.work);
 224         u8 intstat[LP8788_NUM_INTREGS];
 225         u8 idno;
 226         u8 vbus;
 227
 228         if (lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS)) {
 229                 dev_err(pchg->dev, "can not read INT registers\n");
 230                 return;
 231         }
 232
 233         idno = intstat[0] & LP8727_IDNO;
 234         vbus = intstat[0] & LP8727_VBUS;
 235
 236         lp8727_id_detection(pchg, idno, vbus);
 237         lp8727_enable_chgdet(pchg);
 238
 239         power_supply_changed(&pchg->psy->ac);
 240         power_supply_changed(&pchg->psy->usb);
 241         power_supply_changed(&pchg->psy->batt);
 242 }
 243
 244 static irqreturn_t lp8727_isr_func(int irq, void *ptr)
 245 {
 246         struct lp8727_chg *pchg = ptr;
 247
 248         schedule_delayed_work(&pchg->work, pchg->debounce_jiffies);
 249         return IRQ_HANDLED;
 250 }
 251
 252 static int lp8727_setup_irq(struct lp8727_chg *pchg)
 253 {
 254         int ret;
 255         int irq = pchg->client->irq;
 256         unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
 257                                                 DEFAULT_DEBOUNCE_MSEC;
 258
 259         INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
 260
 261         if (irq <= 0) {
 262                 dev_warn(pchg->dev, "invalid irq number: %d\n", irq);
 263                 return 0;
 264         }
 265
 266         ret = request_threaded_irq(irq, NULL, lp8727_isr_func,
 267                                 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 268                                 "lp8727_irq", pchg);
 269
 270         if (ret)
 271                 return ret;
 272
 273         pchg->irq = irq;
 274         pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);
 275
 276         return 0;
 277 }
 278
 279 static void lp8727_release_irq(struct lp8727_chg *pchg)
 280 {
 281         cancel_delayed_work_sync(&pchg->work);
 282
 283         if (pchg->irq)
 284                 free_irq(pchg->irq, pchg);
 285 }
 286
 287 static enum power_supply_property lp8727_charger_prop[] = {
 288         POWER_SUPPLY_PROP_ONLINE,
 289 };
 290
 291 static enum power_supply_property lp8727_battery_prop[] = {
 292         POWER_SUPPLY_PROP_STATUS,
 293         POWER_SUPPLY_PROP_HEALTH,
 294         POWER_SUPPLY_PROP_PRESENT,
 295         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 296         POWER_SUPPLY_PROP_CAPACITY,
 297         POWER_SUPPLY_PROP_TEMP,
 298 };
 299
 300 static char *battery_supplied_to[] = {
 301         "main_batt",
 302 };
 303
 304 static int lp8727_charger_get_property(struct power_supply *psy,
 305                                        enum power_supply_property psp,
 306                                        union power_supply_propval *val)
 307 {
 308         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 309
 310         if (psp != POWER_SUPPLY_PROP_ONLINE)
 311                 return -EINVAL;
 312
 313         val->intval = lp8727_is_charger_attached(psy->name, pchg->devid);
 314
 315         return 0;
 316 }
 317
 318 static bool lp8727_is_high_temperature(enum lp8727_die_temp temp)
 319 {
 320         switch (temp) {
 321         case LP8788_TEMP_95C:
 322         case LP8788_TEMP_115C:
 323         case LP8788_TEMP_135C:
 324                 return true;
 325         default:
 326                 return false;
 327         }
 328 }
 329
 330 static int lp8727_battery_get_property(struct power_supply *psy,
 331                                        enum power_supply_property psp,
 332                                        union power_supply_propval *val)
 333 {
 334         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 335         struct lp8727_platform_data *pdata = pchg->pdata;
 336         enum lp8727_die_temp temp;
 337         u8 read;
 338
 339         switch (psp) {
 340         case POWER_SUPPLY_PROP_STATUS:
 341                 if (!lp8727_is_charger_attached(psy->name, pchg->devid)) {
 342                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 343                         return 0;
 344                 }
 345
 346                 lp8727_read_byte(pchg, LP8727_STATUS1, &read);
 347
 348                 val->intval = (read & LP8727_CHGSTAT) == LP8727_STAT_EOC ?
 349                                 POWER_SUPPLY_STATUS_FULL :
 350                                 POWER_SUPPLY_STATUS_CHARGING;
 351                 break;
 352         case POWER_SUPPLY_PROP_HEALTH:
 353                 lp8727_read_byte(pchg, LP8727_STATUS2, &read);
 354                 temp = (read & LP8727_TEMP_STAT) >> LP8727_TEMP_SHIFT;
 355
 356                 val->intval = lp8727_is_high_temperature(temp) ?
 357                         POWER_SUPPLY_HEALTH_OVERHEAT :
 358                         POWER_SUPPLY_HEALTH_GOOD;
 359                 break;
 360         case POWER_SUPPLY_PROP_PRESENT:
 361                 if (!pdata)
 362                         return -EINVAL;
 363
 364                 if (pdata->get_batt_present)
 365                         val->intval = pchg->pdata->get_batt_present();
 366                 break;
 367         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 368                 if (!pdata)
 369                         return -EINVAL;
 370
 371                 if (pdata->get_batt_level)
 372                         val->intval = pchg->pdata->get_batt_level();
 373                 break;
 374         case POWER_SUPPLY_PROP_CAPACITY:
 375                 if (!pdata)
 376                         return -EINVAL;
 377
 378                 if (pdata->get_batt_capacity)
 379                         val->intval = pchg->pdata->get_batt_capacity();
 380                 break;
 381         case POWER_SUPPLY_PROP_TEMP:
 382                 if (!pdata)
 383                         return -EINVAL;
 384
 385                 if (pdata->get_batt_temp)
 386                         val->intval = pchg->pdata->get_batt_temp();
 387                 break;
 388         default:
 389                 break;
 390         }
 391
 392         return 0;
 393 }
 394
 395 static void lp8727_charger_changed(struct power_supply *psy)
 396 {
 397         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 398         u8 eoc_level;
 399         u8 ichg;
 400         u8 val;
 401
 402         /* skip if no charger exists */
 403         if (!lp8727_is_charger_attached(psy->name, pchg->devid))
 404                 return;
 405
 406         /* update charging parameters */
 407         if (pchg->chg_parm) {
 408                 eoc_level = pchg->chg_parm->eoc_level;
 409                 ichg = pchg->chg_parm->ichg;
 410                 val = (ichg << LP8727_ICHG_SHIFT) | eoc_level;
 411                 lp8727_write_byte(pchg, LP8727_CHGCTRL2, val);
 412         }
 413 }
 414
 415 static int lp8727_register_psy(struct lp8727_chg *pchg)
 416 {
 417         struct lp8727_psy *psy;
 418
 419         psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
 420         if (!psy)
 421                 return -ENOMEM;
 422
 423         pchg->psy = psy;
 424
 425         psy->ac.name = "ac";
 426         psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
 427         psy->ac.properties = lp8727_charger_prop;
 428         psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 429         psy->ac.get_property = lp8727_charger_get_property;
 430         psy->ac.supplied_to = battery_supplied_to;
 431         psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 432
 433         if (power_supply_register(pchg->dev, &psy->ac))
 434                 goto err_psy_ac;
 435
 436         psy->usb.name = "usb";
 437         psy->usb.type = POWER_SUPPLY_TYPE_USB;
 438         psy->usb.properties = lp8727_charger_prop;
 439         psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 440         psy->usb.get_property = lp8727_charger_get_property;
 441         psy->usb.supplied_to = battery_supplied_to;
 442         psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 443
 444         if (power_supply_register(pchg->dev, &psy->usb))
 445                 goto err_psy_usb;
 446
 447         psy->batt.name = "main_batt";
 448         psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
 449         psy->batt.properties = lp8727_battery_prop;
 450         psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
 451         psy->batt.get_property = lp8727_battery_get_property;
 452         psy->batt.external_power_changed = lp8727_charger_changed;
 453
 454         if (power_supply_register(pchg->dev, &psy->batt))
 455                 goto err_psy_batt;
 456
 457         return 0;
 458
 459 err_psy_batt:
 460         power_supply_unregister(&psy->usb);
 461 err_psy_usb:
 462         power_supply_unregister(&psy->ac);
 463 err_psy_ac:
 464         return -EPERM;
 465 }
 466
 467 static void lp8727_unregister_psy(struct lp8727_chg *pchg)
 468 {
 469         struct lp8727_psy *psy = pchg->psy;
 470
 471         if (!psy)
 472                 return;
 473
 474         power_supply_unregister(&psy->ac);
 475         power_supply_unregister(&psy->usb);
 476         power_supply_unregister(&psy->batt);
 477 }
 478
 479 static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 480 {
 481         struct lp8727_chg *pchg;
 482         int ret;
 483
 484         if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
 485                 return -EIO;
 486
 487         pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
 488         if (!pchg)
 489                 return -ENOMEM;
 490
 491         pchg->client = cl;
 492         pchg->dev = &cl->dev;
 493         pchg->pdata = cl->dev.platform_data;
 494         i2c_set_clientdata(cl, pchg);
 495
 496         mutex_init(&pchg->xfer_lock);
 497
 498         ret = lp8727_init_device(pchg);
 499         if (ret) {
 500                 dev_err(pchg->dev, "i2c communication err: %d", ret);
 501                 return ret;
 502         }
 503
 504         ret = lp8727_register_psy(pchg);
 505         if (ret) {
 506                 dev_err(pchg->dev, "power supplies register err: %d", ret);
 507                 return ret;
 508         }
 509
 510         ret = lp8727_setup_irq(pchg);
 511         if (ret) {
 512                 dev_err(pchg->dev, "irq handler err: %d", ret);
 513                 lp8727_unregister_psy(pchg);
 514                 return ret;
 515         }
 516
 517         return 0;
 518 }
 519
 520 static int __devexit lp8727_remove(struct i2c_client *cl)
 521 {
 522         struct lp8727_chg *pchg = i2c_get_clientdata(cl);
 523
 524         lp8727_release_irq(pchg);
 525         lp8727_unregister_psy(pchg);
 526         return 0;
 527 }
 528
 529 static const struct i2c_device_id lp8727_ids[] = {
 530         {"lp8727", 0},
 531         { }
 532 };
 533 MODULE_DEVICE_TABLE(i2c, lp8727_ids);
 534
 535 static struct i2c_driver lp8727_driver = {
 536         .driver = {
 537                    .name = "lp8727",
 538                    },
 539         .probe = lp8727_probe,
 540         .remove = __devexit_p(lp8727_remove),
 541         .id_table = lp8727_ids,
 542 };
 543 module_i2c_driver(lp8727_driver);
 544
 545 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
 546 MODULE_AUTHOR("Woogyom Kim <milo.kim@ti.com>, "
 547               "Daniel Jeong <daniel.jeong@ti.com>");
 548 MODULE_LICENSE("GPL");