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 DEFAULT_DEBOUNCE_MSEC   270
  21
  22 /* Registers */
  23 #define CTRL1           0x1
  24 #define CTRL2           0x2
  25 #define SWCTRL          0x3
  26 #define INT1            0x4
  27 #define INT2            0x5
  28 #define STATUS1         0x6
  29 #define STATUS2         0x7
  30 #define CHGCTRL2        0x9
  31
  32 /* CTRL1 register */
  33 #define CP_EN           (1 << 0)
  34 #define ADC_EN          (1 << 1)
  35 #define ID200_EN        (1 << 4)
  36
  37 /* CTRL2 register */
  38 #define CHGDET_EN       (1 << 1)
  39 #define INT_EN          (1 << 6)
  40
  41 /* SWCTRL register */
  42 #define SW_DM1_DM       (0x0 << 0)
  43 #define SW_DM1_U1       (0x1 << 0)
  44 #define SW_DM1_HiZ      (0x7 << 0)
  45 #define SW_DP2_DP       (0x0 << 3)
  46 #define SW_DP2_U2       (0x1 << 3)
  47 #define SW_DP2_HiZ      (0x7 << 3)
  48
  49 /* INT1 register */
  50 #define IDNO            (0xF << 0)
  51 #define VBUS            (1 << 4)
  52
  53 /* STATUS1 register */
  54 #define CHGSTAT         (3 << 4)
  55 #define CHPORT          (1 << 6)
  56 #define DCPORT          (1 << 7)
  57
  58 /* STATUS2 register */
  59 #define TEMP_STAT       (3 << 5)
  60
  61 enum lp8727_dev_id {
  62         ID_NONE,
  63         ID_TA,
  64         ID_DEDICATED_CHG,
  65         ID_USB_CHG,
  66         ID_USB_DS,
  67         ID_MAX,
  68 };
  69
  70 enum lp8727_chg_stat {
  71         PRECHG,
  72         CC,
  73         CV,
  74         EOC,
  75 };
  76
  77 struct lp8727_psy {
  78         struct power_supply ac;
  79         struct power_supply usb;
  80         struct power_supply batt;
  81 };
  82
  83 struct lp8727_chg {
  84         struct device *dev;
  85         struct i2c_client *client;
  86         struct mutex xfer_lock;
  87         struct delayed_work work;
  88         struct lp8727_platform_data *pdata;
  89         struct lp8727_psy *psy;
  90         struct lp8727_chg_param *chg_parm;
  91         enum lp8727_dev_id devid;
  92         unsigned long debounce_jiffies;
  93         int irq;
  94 };
  95
  96 static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
  97 {
  98         s32 ret;
  99
 100         mutex_lock(&pchg->xfer_lock);
 101         ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
 102         mutex_unlock(&pchg->xfer_lock);
 103
 104         return (ret != len) ? -EIO : 0;
 105 }
 106
 107 static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data)
 108 {
 109         return lp8727_read_bytes(pchg, reg, data, 1);
 110 }
 111
 112 static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
 113 {
 114         int ret;
 115
 116         mutex_lock(&pchg->xfer_lock);
 117         ret = i2c_smbus_write_byte_data(pchg->client, reg, data);
 118         mutex_unlock(&pchg->xfer_lock);
 119
 120         return ret;
 121 }
 122
 123 static int lp8727_is_charger_attached(const char *name, int id)
 124 {
 125         if (name) {
 126                 if (!strcmp(name, "ac"))
 127                         return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0;
 128                 else if (!strcmp(name, "usb"))
 129                         return (id == ID_USB_CHG) ? 1 : 0;
 130         }
 131
 132         return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
 133 }
 134
 135 static int lp8727_init_device(struct lp8727_chg *pchg)
 136 {
 137         u8 val;
 138         int ret;
 139
 140         val = ID200_EN | ADC_EN | CP_EN;
 141         ret = lp8727_write_byte(pchg, CTRL1, val);
 142         if (ret)
 143                 return ret;
 144
 145         val = INT_EN | CHGDET_EN;
 146         ret = lp8727_write_byte(pchg, CTRL2, val);
 147         if (ret)
 148                 return ret;
 149
 150         return 0;
 151 }
 152
 153 static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
 154 {
 155         u8 val;
 156         lp8727_read_byte(pchg, STATUS1, &val);
 157         return val & DCPORT;
 158 }
 159
 160 static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
 161 {
 162         u8 val;
 163         lp8727_read_byte(pchg, STATUS1, &val);
 164         return val & CHPORT;
 165 }
 166
 167 static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
 168 {
 169         lp8727_write_byte(pchg, SWCTRL, sw);
 170 }
 171
 172 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
 173 {
 174         struct lp8727_platform_data *pdata = pchg->pdata;
 175         u8 devid = ID_NONE;
 176         u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ;
 177
 178         switch (id) {
 179         case 0x5:
 180                 devid = ID_TA;
 181                 pchg->chg_parm = pdata ? pdata->ac : NULL;
 182                 break;
 183         case 0xB:
 184                 if (lp8727_is_dedicated_charger(pchg)) {
 185                         pchg->chg_parm = pdata ? pdata->ac : NULL;
 186                         devid = ID_DEDICATED_CHG;
 187                 } else if (lp8727_is_usb_charger(pchg)) {
 188                         pchg->chg_parm = pdata ? pdata->usb : NULL;
 189                         devid = ID_USB_CHG;
 190                         swctrl = SW_DM1_DM | SW_DP2_DP;
 191                 } else if (vbusin) {
 192                         devid = ID_USB_DS;
 193                         swctrl = SW_DM1_DM | SW_DP2_DP;
 194                 }
 195                 break;
 196         default:
 197                 devid = ID_NONE;
 198                 pchg->chg_parm = NULL;
 199                 break;
 200         }
 201
 202         pchg->devid = devid;
 203         lp8727_ctrl_switch(pchg, swctrl);
 204 }
 205
 206 static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
 207 {
 208         u8 val;
 209
 210         lp8727_read_byte(pchg, CTRL2, &val);
 211         val |= CHGDET_EN;
 212         lp8727_write_byte(pchg, CTRL2, val);
 213 }
 214
 215 static void lp8727_delayed_func(struct work_struct *_work)
 216 {
 217         u8 intstat[2], idno, vbus;
 218         struct lp8727_chg *pchg =
 219             container_of(_work, struct lp8727_chg, work.work);
 220
 221         if (lp8727_read_bytes(pchg, INT1, intstat, 2)) {
 222                 dev_err(pchg->dev, "can not read INT registers\n");
 223                 return;
 224         }
 225
 226         idno = intstat[0] & IDNO;
 227         vbus = intstat[0] & VBUS;
 228
 229         lp8727_id_detection(pchg, idno, vbus);
 230         lp8727_enable_chgdet(pchg);
 231
 232         power_supply_changed(&pchg->psy->ac);
 233         power_supply_changed(&pchg->psy->usb);
 234         power_supply_changed(&pchg->psy->batt);
 235 }
 236
 237 static irqreturn_t lp8727_isr_func(int irq, void *ptr)
 238 {
 239         struct lp8727_chg *pchg = ptr;
 240
 241         schedule_delayed_work(&pchg->work, pchg->debounce_jiffies);
 242         return IRQ_HANDLED;
 243 }
 244
 245 static int lp8727_setup_irq(struct lp8727_chg *pchg)
 246 {
 247         int ret;
 248         int irq = pchg->client->irq;
 249         unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
 250                                                 DEFAULT_DEBOUNCE_MSEC;
 251
 252         INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
 253
 254         if (irq <= 0) {
 255                 dev_warn(pchg->dev, "invalid irq number: %d\n", irq);
 256                 return 0;
 257         }
 258
 259         ret = request_threaded_irq(irq, NULL, lp8727_isr_func,
 260                                 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 261                                 "lp8727_irq", pchg);
 262
 263         if (ret)
 264                 return ret;
 265
 266         pchg->irq = irq;
 267         pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);
 268
 269         return 0;
 270 }
 271
 272 static void lp8727_release_irq(struct lp8727_chg *pchg)
 273 {
 274         cancel_delayed_work_sync(&pchg->work);
 275
 276         if (pchg->irq)
 277                 free_irq(pchg->irq, pchg);
 278 }
 279
 280 static enum power_supply_property lp8727_charger_prop[] = {
 281         POWER_SUPPLY_PROP_ONLINE,
 282 };
 283
 284 static enum power_supply_property lp8727_battery_prop[] = {
 285         POWER_SUPPLY_PROP_STATUS,
 286         POWER_SUPPLY_PROP_HEALTH,
 287         POWER_SUPPLY_PROP_PRESENT,
 288         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 289         POWER_SUPPLY_PROP_CAPACITY,
 290         POWER_SUPPLY_PROP_TEMP,
 291 };
 292
 293 static char *battery_supplied_to[] = {
 294         "main_batt",
 295 };
 296
 297 static int lp8727_charger_get_property(struct power_supply *psy,
 298                                        enum power_supply_property psp,
 299                                        union power_supply_propval *val)
 300 {
 301         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 302
 303         if (psp == POWER_SUPPLY_PROP_ONLINE)
 304                 val->intval = lp8727_is_charger_attached(psy->name,
 305                                                          pchg->devid);
 306
 307         return 0;
 308 }
 309
 310 static int lp8727_battery_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         struct lp8727_platform_data *pdata = pchg->pdata;
 316         u8 read;
 317
 318         switch (psp) {
 319         case POWER_SUPPLY_PROP_STATUS:
 320                 if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
 321                         lp8727_read_byte(pchg, STATUS1, &read);
 322                         if (((read & CHGSTAT) >> 4) == EOC)
 323                                 val->intval = POWER_SUPPLY_STATUS_FULL;
 324                         else
 325                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
 326                 } else {
 327                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 328                 }
 329                 break;
 330         case POWER_SUPPLY_PROP_HEALTH:
 331                 lp8727_read_byte(pchg, STATUS2, &read);
 332                 read = (read & TEMP_STAT) >> 5;
 333                 if (read >= 0x1 && read <= 0x3)
 334                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 335                 else
 336                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 337                 break;
 338         case POWER_SUPPLY_PROP_PRESENT:
 339                 if (!pdata)
 340                         return -EINVAL;
 341
 342                 if (pdata->get_batt_present)
 343                         val->intval = pchg->pdata->get_batt_present();
 344                 break;
 345         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 346                 if (!pdata)
 347                         return -EINVAL;
 348
 349                 if (pdata->get_batt_level)
 350                         val->intval = pchg->pdata->get_batt_level();
 351                 break;
 352         case POWER_SUPPLY_PROP_CAPACITY:
 353                 if (!pdata)
 354                         return -EINVAL;
 355
 356                 if (pdata->get_batt_capacity)
 357                         val->intval = pchg->pdata->get_batt_capacity();
 358                 break;
 359         case POWER_SUPPLY_PROP_TEMP:
 360                 if (!pdata)
 361                         return -EINVAL;
 362
 363                 if (pdata->get_batt_temp)
 364                         val->intval = pchg->pdata->get_batt_temp();
 365                 break;
 366         default:
 367                 break;
 368         }
 369
 370         return 0;
 371 }
 372
 373 static void lp8727_charger_changed(struct power_supply *psy)
 374 {
 375         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 376         u8 val;
 377         u8 eoc_level, ichg;
 378
 379         if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
 380                 if (pchg->chg_parm) {
 381                         eoc_level = pchg->chg_parm->eoc_level;
 382                         ichg = pchg->chg_parm->ichg;
 383                         val = (ichg << 4) | eoc_level;
 384                         lp8727_write_byte(pchg, CHGCTRL2, val);
 385                 }
 386         }
 387 }
 388
 389 static int lp8727_register_psy(struct lp8727_chg *pchg)
 390 {
 391         struct lp8727_psy *psy;
 392
 393         psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
 394         if (!psy)
 395                 return -ENOMEM;
 396
 397         pchg->psy = psy;
 398
 399         psy->ac.name = "ac";
 400         psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
 401         psy->ac.properties = lp8727_charger_prop;
 402         psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 403         psy->ac.get_property = lp8727_charger_get_property;
 404         psy->ac.supplied_to = battery_supplied_to;
 405         psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 406
 407         if (power_supply_register(pchg->dev, &psy->ac))
 408                 goto err_psy_ac;
 409
 410         psy->usb.name = "usb";
 411         psy->usb.type = POWER_SUPPLY_TYPE_USB;
 412         psy->usb.properties = lp8727_charger_prop;
 413         psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 414         psy->usb.get_property = lp8727_charger_get_property;
 415         psy->usb.supplied_to = battery_supplied_to;
 416         psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 417
 418         if (power_supply_register(pchg->dev, &psy->usb))
 419                 goto err_psy_usb;
 420
 421         psy->batt.name = "main_batt";
 422         psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
 423         psy->batt.properties = lp8727_battery_prop;
 424         psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
 425         psy->batt.get_property = lp8727_battery_get_property;
 426         psy->batt.external_power_changed = lp8727_charger_changed;
 427
 428         if (power_supply_register(pchg->dev, &psy->batt))
 429                 goto err_psy_batt;
 430
 431         return 0;
 432
 433 err_psy_batt:
 434         power_supply_unregister(&psy->usb);
 435 err_psy_usb:
 436         power_supply_unregister(&psy->ac);
 437 err_psy_ac:
 438         return -EPERM;
 439 }
 440
 441 static void lp8727_unregister_psy(struct lp8727_chg *pchg)
 442 {
 443         struct lp8727_psy *psy = pchg->psy;
 444
 445         if (!psy)
 446                 return;
 447
 448         power_supply_unregister(&psy->ac);
 449         power_supply_unregister(&psy->usb);
 450         power_supply_unregister(&psy->batt);
 451 }
 452
 453 static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 454 {
 455         struct lp8727_chg *pchg;
 456         int ret;
 457
 458         if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
 459                 return -EIO;
 460
 461         pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
 462         if (!pchg)
 463                 return -ENOMEM;
 464
 465         pchg->client = cl;
 466         pchg->dev = &cl->dev;
 467         pchg->pdata = cl->dev.platform_data;
 468         i2c_set_clientdata(cl, pchg);
 469
 470         mutex_init(&pchg->xfer_lock);
 471
 472         ret = lp8727_init_device(pchg);
 473         if (ret) {
 474                 dev_err(pchg->dev, "i2c communication err: %d", ret);
 475                 return ret;
 476         }
 477
 478         ret = lp8727_register_psy(pchg);
 479         if (ret) {
 480                 dev_err(pchg->dev, "power supplies register err: %d", ret);
 481                 return ret;
 482         }
 483
 484         ret = lp8727_setup_irq(pchg);
 485         if (ret) {
 486                 dev_err(pchg->dev, "irq handler err: %d", ret);
 487                 lp8727_unregister_psy(pchg);
 488                 return ret;
 489         }
 490
 491         return 0;
 492 }
 493
 494 static int __devexit lp8727_remove(struct i2c_client *cl)
 495 {
 496         struct lp8727_chg *pchg = i2c_get_clientdata(cl);
 497
 498         lp8727_release_irq(pchg);
 499         lp8727_unregister_psy(pchg);
 500         return 0;
 501 }
 502
 503 static const struct i2c_device_id lp8727_ids[] = {
 504         {"lp8727", 0},
 505         { }
 506 };
 507 MODULE_DEVICE_TABLE(i2c, lp8727_ids);
 508
 509 static struct i2c_driver lp8727_driver = {
 510         .driver = {
 511                    .name = "lp8727",
 512                    },
 513         .probe = lp8727_probe,
 514         .remove = __devexit_p(lp8727_remove),
 515         .id_table = lp8727_ids,
 516 };
 517 module_i2c_driver(lp8727_driver);
 518
 519 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
 520 MODULE_AUTHOR("Woogyom Kim <milo.kim@ti.com>, "
 521               "Daniel Jeong <daniel.jeong@ti.com>");
 522 MODULE_LICENSE("GPL");