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 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 delayed_work work;
  89         struct lp8727_platform_data *pdata;
  90         struct lp8727_psy *psy;
  91         struct lp8727_chg_param *chg_parm;
  92         enum lp8727_dev_id devid;
  93         unsigned long debounce_jiffies;
  94         int irq;
  95 };
  96
  97 static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
  98 {
  99         s32 ret;
 100
 101         mutex_lock(&pchg->xfer_lock);
 102         ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
 103         mutex_unlock(&pchg->xfer_lock);
 104
 105         return (ret != len) ? -EIO : 0;
 106 }
 107
 108 static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data)
 109 {
 110         return lp8727_read_bytes(pchg, reg, data, 1);
 111 }
 112
 113 static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
 114 {
 115         int ret;
 116
 117         mutex_lock(&pchg->xfer_lock);
 118         ret = i2c_smbus_write_byte_data(pchg->client, reg, data);
 119         mutex_unlock(&pchg->xfer_lock);
 120
 121         return ret;
 122 }
 123
 124 static int lp8727_is_charger_attached(const char *name, int id)
 125 {
 126         if (name) {
 127                 if (!strcmp(name, "ac"))
 128                         return (id == LP8727_ID_TA || id == LP8727_ID_DEDICATED_CHG) ? 1 : 0;
 129                 else if (!strcmp(name, "usb"))
 130                         return (id == LP8727_ID_USB_CHG) ? 1 : 0;
 131         }
 132
 133         return (id >= LP8727_ID_TA && id <= LP8727_ID_USB_CHG) ? 1 : 0;
 134 }
 135
 136 static int lp8727_init_device(struct lp8727_chg *pchg)
 137 {
 138         u8 val;
 139         int ret;
 140         u8 intstat[LP8788_NUM_INTREGS];
 141
 142         /* clear interrupts */
 143         ret = lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS);
 144         if (ret)
 145                 return ret;
 146
 147
 148         val = LP8727_ID200_EN | LP8727_ADC_EN | LP8727_CP_EN;
 149         ret = lp8727_write_byte(pchg, LP8727_CTRL1, val);
 150         if (ret)
 151                 return ret;
 152
 153         val = LP8727_INT_EN | LP8727_CHGDET_EN;
 154         ret = lp8727_write_byte(pchg, LP8727_CTRL2, val);
 155         if (ret)
 156                 return ret;
 157
 158         return 0;
 159 }
 160
 161 static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
 162 {
 163         u8 val;
 164         lp8727_read_byte(pchg, LP8727_STATUS1, &val);
 165         return val & LP8727_DCPORT;
 166 }
 167
 168 static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
 169 {
 170         u8 val;
 171         lp8727_read_byte(pchg, LP8727_STATUS1, &val);
 172         return val & LP8727_CHPORT;
 173 }
 174
 175 static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
 176 {
 177         lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
 178 }
 179
 180 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
 181 {
 182         struct lp8727_platform_data *pdata = pchg->pdata;
 183         u8 devid = LP8727_ID_NONE;
 184         u8 swctrl = LP8727_SW_DM1_HiZ | LP8727_SW_DP2_HiZ;
 185
 186         switch (id) {
 187         case 0x5:
 188                 devid = LP8727_ID_TA;
 189                 pchg->chg_parm = pdata ? pdata->ac : NULL;
 190                 break;
 191         case 0xB:
 192                 if (lp8727_is_dedicated_charger(pchg)) {
 193                         pchg->chg_parm = pdata ? pdata->ac : NULL;
 194                         devid = LP8727_ID_DEDICATED_CHG;
 195                 } else if (lp8727_is_usb_charger(pchg)) {
 196                         pchg->chg_parm = pdata ? pdata->usb : NULL;
 197                         devid = LP8727_ID_USB_CHG;
 198                         swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
 199                 } else if (vbusin) {
 200                         devid = LP8727_ID_USB_DS;
 201                         swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
 202                 }
 203                 break;
 204         default:
 205                 devid = LP8727_ID_NONE;
 206                 pchg->chg_parm = NULL;
 207                 break;
 208         }
 209
 210         pchg->devid = devid;
 211         lp8727_ctrl_switch(pchg, swctrl);
 212 }
 213
 214 static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
 215 {
 216         u8 val;
 217
 218         lp8727_read_byte(pchg, LP8727_CTRL2, &val);
 219         val |= LP8727_CHGDET_EN;
 220         lp8727_write_byte(pchg, LP8727_CTRL2, val);
 221 }
 222
 223 static void lp8727_delayed_func(struct work_struct *_work)
 224 {
 225         u8 intstat[2], idno, vbus;
 226         struct lp8727_chg *pchg =
 227             container_of(_work, struct lp8727_chg, work.work);
 228
 229         if (lp8727_read_bytes(pchg, LP8727_INT1, intstat, 2)) {
 230                 dev_err(pchg->dev, "can not read INT registers\n");
 231                 return;
 232         }
 233
 234         idno = intstat[0] & LP8727_IDNO;
 235         vbus = intstat[0] & LP8727_VBUS;
 236
 237         lp8727_id_detection(pchg, idno, vbus);
 238         lp8727_enable_chgdet(pchg);
 239
 240         power_supply_changed(&pchg->psy->ac);
 241         power_supply_changed(&pchg->psy->usb);
 242         power_supply_changed(&pchg->psy->batt);
 243 }
 244
 245 static irqreturn_t lp8727_isr_func(int irq, void *ptr)
 246 {
 247         struct lp8727_chg *pchg = ptr;
 248
 249         schedule_delayed_work(&pchg->work, pchg->debounce_jiffies);
 250         return IRQ_HANDLED;
 251 }
 252
 253 static int lp8727_setup_irq(struct lp8727_chg *pchg)
 254 {
 255         int ret;
 256         int irq = pchg->client->irq;
 257         unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
 258                                                 DEFAULT_DEBOUNCE_MSEC;
 259
 260         INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
 261
 262         if (irq <= 0) {
 263                 dev_warn(pchg->dev, "invalid irq number: %d\n", irq);
 264                 return 0;
 265         }
 266
 267         ret = request_threaded_irq(irq, NULL, lp8727_isr_func,
 268                                 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 269                                 "lp8727_irq", pchg);
 270
 271         if (ret)
 272                 return ret;
 273
 274         pchg->irq = irq;
 275         pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);
 276
 277         return 0;
 278 }
 279
 280 static void lp8727_release_irq(struct lp8727_chg *pchg)
 281 {
 282         cancel_delayed_work_sync(&pchg->work);
 283
 284         if (pchg->irq)
 285                 free_irq(pchg->irq, pchg);
 286 }
 287
 288 static enum power_supply_property lp8727_charger_prop[] = {
 289         POWER_SUPPLY_PROP_ONLINE,
 290 };
 291
 292 static enum power_supply_property lp8727_battery_prop[] = {
 293         POWER_SUPPLY_PROP_STATUS,
 294         POWER_SUPPLY_PROP_HEALTH,
 295         POWER_SUPPLY_PROP_PRESENT,
 296         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 297         POWER_SUPPLY_PROP_CAPACITY,
 298         POWER_SUPPLY_PROP_TEMP,
 299 };
 300
 301 static char *battery_supplied_to[] = {
 302         "main_batt",
 303 };
 304
 305 static int lp8727_charger_get_property(struct power_supply *psy,
 306                                        enum power_supply_property psp,
 307                                        union power_supply_propval *val)
 308 {
 309         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 310
 311         if (psp == POWER_SUPPLY_PROP_ONLINE)
 312                 val->intval = lp8727_is_charger_attached(psy->name,
 313                                                          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                         lp8727_read_byte(pchg, LP8727_STATUS1, &read);
 343
 344                         val->intval = (read & LP8727_CHGSTAT) == LP8727_STAT_EOC ?
 345                                 POWER_SUPPLY_STATUS_FULL :
 346                                 POWER_SUPPLY_STATUS_CHARGING;
 347                 } else {
 348                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 349                 }
 350                 break;
 351         case POWER_SUPPLY_PROP_HEALTH:
 352                 lp8727_read_byte(pchg, LP8727_STATUS2, &read);
 353                 temp = (read & LP8727_TEMP_STAT) >> LP8727_TEMP_SHIFT;
 354
 355                 val->intval = lp8727_is_high_temperature(temp) ?
 356                         POWER_SUPPLY_HEALTH_OVERHEAT :
 357                         POWER_SUPPLY_HEALTH_GOOD;
 358                 break;
 359         case POWER_SUPPLY_PROP_PRESENT:
 360                 if (!pdata)
 361                         return -EINVAL;
 362
 363                 if (pdata->get_batt_present)
 364                         val->intval = pchg->pdata->get_batt_present();
 365                 break;
 366         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 367                 if (!pdata)
 368                         return -EINVAL;
 369
 370                 if (pdata->get_batt_level)
 371                         val->intval = pchg->pdata->get_batt_level();
 372                 break;
 373         case POWER_SUPPLY_PROP_CAPACITY:
 374                 if (!pdata)
 375                         return -EINVAL;
 376
 377                 if (pdata->get_batt_capacity)
 378                         val->intval = pchg->pdata->get_batt_capacity();
 379                 break;
 380         case POWER_SUPPLY_PROP_TEMP:
 381                 if (!pdata)
 382                         return -EINVAL;
 383
 384                 if (pdata->get_batt_temp)
 385                         val->intval = pchg->pdata->get_batt_temp();
 386                 break;
 387         default:
 388                 break;
 389         }
 390
 391         return 0;
 392 }
 393
 394 static void lp8727_charger_changed(struct power_supply *psy)
 395 {
 396         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 397         u8 val;
 398         u8 eoc_level, ichg;
 399
 400         if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
 401                 if (pchg->chg_parm) {
 402                         eoc_level = pchg->chg_parm->eoc_level;
 403                         ichg = pchg->chg_parm->ichg;
 404                         val = (ichg << 4) | eoc_level;
 405                         lp8727_write_byte(pchg, LP8727_CHGCTRL2, val);
 406                 }
 407         }
 408 }
 409
 410 static int lp8727_register_psy(struct lp8727_chg *pchg)
 411 {
 412         struct lp8727_psy *psy;
 413
 414         psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
 415         if (!psy)
 416                 return -ENOMEM;
 417
 418         pchg->psy = psy;
 419
 420         psy->ac.name = "ac";
 421         psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
 422         psy->ac.properties = lp8727_charger_prop;
 423         psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 424         psy->ac.get_property = lp8727_charger_get_property;
 425         psy->ac.supplied_to = battery_supplied_to;
 426         psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 427
 428         if (power_supply_register(pchg->dev, &psy->ac))
 429                 goto err_psy_ac;
 430
 431         psy->usb.name = "usb";
 432         psy->usb.type = POWER_SUPPLY_TYPE_USB;
 433         psy->usb.properties = lp8727_charger_prop;
 434         psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 435         psy->usb.get_property = lp8727_charger_get_property;
 436         psy->usb.supplied_to = battery_supplied_to;
 437         psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 438
 439         if (power_supply_register(pchg->dev, &psy->usb))
 440                 goto err_psy_usb;
 441
 442         psy->batt.name = "main_batt";
 443         psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
 444         psy->batt.properties = lp8727_battery_prop;
 445         psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
 446         psy->batt.get_property = lp8727_battery_get_property;
 447         psy->batt.external_power_changed = lp8727_charger_changed;
 448
 449         if (power_supply_register(pchg->dev, &psy->batt))
 450                 goto err_psy_batt;
 451
 452         return 0;
 453
 454 err_psy_batt:
 455         power_supply_unregister(&psy->usb);
 456 err_psy_usb:
 457         power_supply_unregister(&psy->ac);
 458 err_psy_ac:
 459         return -EPERM;
 460 }
 461
 462 static void lp8727_unregister_psy(struct lp8727_chg *pchg)
 463 {
 464         struct lp8727_psy *psy = pchg->psy;
 465
 466         if (!psy)
 467                 return;
 468
 469         power_supply_unregister(&psy->ac);
 470         power_supply_unregister(&psy->usb);
 471         power_supply_unregister(&psy->batt);
 472 }
 473
 474 static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 475 {
 476         struct lp8727_chg *pchg;
 477         int ret;
 478
 479         if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
 480                 return -EIO;
 481
 482         pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
 483         if (!pchg)
 484                 return -ENOMEM;
 485
 486         pchg->client = cl;
 487         pchg->dev = &cl->dev;
 488         pchg->pdata = cl->dev.platform_data;
 489         i2c_set_clientdata(cl, pchg);
 490
 491         mutex_init(&pchg->xfer_lock);
 492
 493         ret = lp8727_init_device(pchg);
 494         if (ret) {
 495                 dev_err(pchg->dev, "i2c communication err: %d", ret);
 496                 return ret;
 497         }
 498
 499         ret = lp8727_register_psy(pchg);
 500         if (ret) {
 501                 dev_err(pchg->dev, "power supplies register err: %d", ret);
 502                 return ret;
 503         }
 504
 505         ret = lp8727_setup_irq(pchg);
 506         if (ret) {
 507                 dev_err(pchg->dev, "irq handler err: %d", ret);
 508                 lp8727_unregister_psy(pchg);
 509                 return ret;
 510         }
 511
 512         return 0;
 513 }
 514
 515 static int __devexit lp8727_remove(struct i2c_client *cl)
 516 {
 517         struct lp8727_chg *pchg = i2c_get_clientdata(cl);
 518
 519         lp8727_release_irq(pchg);
 520         lp8727_unregister_psy(pchg);
 521         return 0;
 522 }
 523
 524 static const struct i2c_device_id lp8727_ids[] = {
 525         {"lp8727", 0},
 526         { }
 527 };
 528 MODULE_DEVICE_TABLE(i2c, lp8727_ids);
 529
 530 static struct i2c_driver lp8727_driver = {
 531         .driver = {
 532                    .name = "lp8727",
 533                    },
 534         .probe = lp8727_probe,
 535         .remove = __devexit_p(lp8727_remove),
 536         .id_table = lp8727_ids,
 537 };
 538 module_i2c_driver(lp8727_driver);
 539
 540 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
 541 MODULE_AUTHOR("Woogyom Kim <milo.kim@ti.com>, "
 542               "Daniel Jeong <daniel.jeong@ti.com>");
 543 MODULE_LICENSE("GPL");