drivers/power/lp8727_charger.c

   1 /*
   2  * Driver for LP8727 Micro/Mini USB IC with intergrated charger
   3  *
   4  *                      Copyright (C) 2011 National Semiconductor
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/i2c.h>
  16 #include <linux/power_supply.h>
  17 #include <linux/lp8727.h>
  18
  19 #define DEBOUNCE_MSEC   270
  20
  21 /* Registers */
  22 #define CTRL1           0x1
  23 #define CTRL2           0x2
  24 #define SWCTRL          0x3
  25 #define INT1            0x4
  26 #define INT2            0x5
  27 #define STATUS1         0x6
  28 #define STATUS2         0x7
  29 #define CHGCTRL2        0x9
  30
  31 /* CTRL1 register */
  32 #define CP_EN           (1 << 0)
  33 #define ADC_EN          (1 << 1)
  34 #define ID200_EN        (1 << 4)
  35
  36 /* CTRL2 register */
  37 #define CHGDET_EN       (1 << 1)
  38 #define INT_EN          (1 << 6)
  39
  40 /* SWCTRL register */
  41 #define SW_DM1_DM       (0x0 << 0)
  42 #define SW_DM1_U1       (0x1 << 0)
  43 #define SW_DM1_HiZ      (0x7 << 0)
  44 #define SW_DP2_DP       (0x0 << 3)
  45 #define SW_DP2_U2       (0x1 << 3)
  46 #define SW_DP2_HiZ      (0x7 << 3)
  47
  48 /* INT1 register */
  49 #define IDNO            (0xF << 0)
  50 #define VBUS            (1 << 4)
  51
  52 /* STATUS1 register */
  53 #define CHGSTAT         (3 << 4)
  54 #define CHPORT          (1 << 6)
  55 #define DCPORT          (1 << 7)
  56
  57 /* STATUS2 register */
  58 #define TEMP_STAT       (3 << 5)
  59
  60 enum lp8727_dev_id {
  61         ID_NONE,
  62         ID_TA,
  63         ID_DEDICATED_CHG,
  64         ID_USB_CHG,
  65         ID_USB_DS,
  66         ID_MAX,
  67 };
  68
  69 enum lp8727_chg_stat {
  70         PRECHG,
  71         CC,
  72         CV,
  73         EOC,
  74 };
  75
  76 struct lp8727_psy {
  77         struct power_supply ac;
  78         struct power_supply usb;
  79         struct power_supply batt;
  80 };
  81
  82 struct lp8727_chg {
  83         struct device *dev;
  84         struct i2c_client *client;
  85         struct mutex xfer_lock;
  86         struct delayed_work work;
  87         struct workqueue_struct *irqthread;
  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 };
  93
  94 static int lp8727_i2c_read(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
  95 {
  96         s32 ret;
  97
  98         mutex_lock(&pchg->xfer_lock);
  99         ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
 100         mutex_unlock(&pchg->xfer_lock);
 101
 102         return (ret != len) ? -EIO : 0;
 103 }
 104
 105 static int lp8727_i2c_write(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_write_i2c_block_data(pchg->client, reg, len, data);
 111         mutex_unlock(&pchg->xfer_lock);
 112
 113         return ret;
 114 }
 115
 116 static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg,
 117                                        u8 *data)
 118 {
 119         return lp8727_i2c_read(pchg, reg, data, 1);
 120 }
 121
 122 static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg,
 123                                         u8 *data)
 124 {
 125         return lp8727_i2c_write(pchg, reg, data, 1);
 126 }
 127
 128 static int lp8727_is_charger_attached(const char *name, int id)
 129 {
 130         if (name) {
 131                 if (!strcmp(name, "ac"))
 132                         return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0;
 133                 else if (!strcmp(name, "usb"))
 134                         return (id == ID_USB_CHG) ? 1 : 0;
 135         }
 136
 137         return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
 138 }
 139
 140 static void lp8727_init_device(struct lp8727_chg *pchg)
 141 {
 142         u8 val;
 143
 144         val = ID200_EN | ADC_EN | CP_EN;
 145         if (lp8727_i2c_write_byte(pchg, CTRL1, &val))
 146                 dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL1);
 147
 148         val = INT_EN | CHGDET_EN;
 149         if (lp8727_i2c_write_byte(pchg, CTRL2, &val))
 150                 dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL2);
 151 }
 152
 153 static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
 154 {
 155         u8 val;
 156         lp8727_i2c_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_i2c_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         u8 val = sw;
 170         lp8727_i2c_write_byte(pchg, SWCTRL, &val);
 171 }
 172
 173 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
 174 {
 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 = &pchg->pdata->ac;
 182                 break;
 183         case 0xB:
 184                 if (lp8727_is_dedicated_charger(pchg)) {
 185                         pchg->chg_parm = &pchg->pdata->ac;
 186                         devid = ID_DEDICATED_CHG;
 187                 } else if (lp8727_is_usb_charger(pchg)) {
 188                         pchg->chg_parm = &pchg->pdata->usb;
 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_i2c_read_byte(pchg, CTRL2, &val);
 211         val |= CHGDET_EN;
 212         lp8727_i2c_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_i2c_read(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         unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);
 241
 242         queue_delayed_work(pchg->irqthread, &pchg->work, delay);
 243
 244         return IRQ_HANDLED;
 245 }
 246
 247 static void lp8727_intr_config(struct lp8727_chg *pchg)
 248 {
 249         INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
 250
 251         pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
 252         if (!pchg->irqthread)
 253                 dev_err(pchg->dev, "can not create thread for lp8727\n");
 254
 255         if (request_threaded_irq(pchg->client->irq,
 256                                  NULL,
 257                                  lp8727_isr_func,
 258                                  IRQF_TRIGGER_FALLING, "lp8727_irq", pchg)) {
 259                 dev_err(pchg->dev, "lp8727 irq can not be registered\n");
 260         }
 261 }
 262
 263 static enum power_supply_property lp8727_charger_prop[] = {
 264         POWER_SUPPLY_PROP_ONLINE,
 265 };
 266
 267 static enum power_supply_property lp8727_battery_prop[] = {
 268         POWER_SUPPLY_PROP_STATUS,
 269         POWER_SUPPLY_PROP_HEALTH,
 270         POWER_SUPPLY_PROP_PRESENT,
 271         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 272         POWER_SUPPLY_PROP_CAPACITY,
 273         POWER_SUPPLY_PROP_TEMP,
 274 };
 275
 276 static char *battery_supplied_to[] = {
 277         "main_batt",
 278 };
 279
 280 static int lp8727_charger_get_property(struct power_supply *psy,
 281                                        enum power_supply_property psp,
 282                                        union power_supply_propval *val)
 283 {
 284         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 285
 286         if (psp == POWER_SUPPLY_PROP_ONLINE)
 287                 val->intval = lp8727_is_charger_attached(psy->name,
 288                                                          pchg->devid);
 289
 290         return 0;
 291 }
 292
 293 static int lp8727_battery_get_property(struct power_supply *psy,
 294                                        enum power_supply_property psp,
 295                                        union power_supply_propval *val)
 296 {
 297         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 298         u8 read;
 299
 300         switch (psp) {
 301         case POWER_SUPPLY_PROP_STATUS:
 302                 if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
 303                         lp8727_i2c_read_byte(pchg, STATUS1, &read);
 304                         if (((read & CHGSTAT) >> 4) == EOC)
 305                                 val->intval = POWER_SUPPLY_STATUS_FULL;
 306                         else
 307                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
 308                 } else {
 309                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 310                 }
 311                 break;
 312         case POWER_SUPPLY_PROP_HEALTH:
 313                 lp8727_i2c_read_byte(pchg, STATUS2, &read);
 314                 read = (read & TEMP_STAT) >> 5;
 315                 if (read >= 0x1 && read <= 0x3)
 316                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 317                 else
 318                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 319                 break;
 320         case POWER_SUPPLY_PROP_PRESENT:
 321                 if (pchg->pdata->get_batt_present)
 322                         val->intval = pchg->pdata->get_batt_present();
 323                 break;
 324         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 325                 if (pchg->pdata->get_batt_level)
 326                         val->intval = pchg->pdata->get_batt_level();
 327                 break;
 328         case POWER_SUPPLY_PROP_CAPACITY:
 329                 if (pchg->pdata->get_batt_capacity)
 330                         val->intval = pchg->pdata->get_batt_capacity();
 331                 break;
 332         case POWER_SUPPLY_PROP_TEMP:
 333                 if (pchg->pdata->get_batt_temp)
 334                         val->intval = pchg->pdata->get_batt_temp();
 335                 break;
 336         default:
 337                 break;
 338         }
 339
 340         return 0;
 341 }
 342
 343 static void lp8727_charger_changed(struct power_supply *psy)
 344 {
 345         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 346         u8 val;
 347         u8 eoc_level, ichg;
 348
 349         if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
 350                 if (pchg->chg_parm) {
 351                         eoc_level = pchg->chg_parm->eoc_level;
 352                         ichg = pchg->chg_parm->ichg;
 353                         val = (ichg << 4) | eoc_level;
 354                         lp8727_i2c_write_byte(pchg, CHGCTRL2, &val);
 355                 }
 356         }
 357 }
 358
 359 static int lp8727_register_psy(struct lp8727_chg *pchg)
 360 {
 361         struct lp8727_psy *psy;
 362
 363         psy = kzalloc(sizeof(*psy), GFP_KERNEL);
 364         if (!psy)
 365                 goto err_mem;
 366
 367         pchg->psy = psy;
 368
 369         psy->ac.name = "ac";
 370         psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
 371         psy->ac.properties = lp8727_charger_prop;
 372         psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 373         psy->ac.get_property = lp8727_charger_get_property;
 374         psy->ac.supplied_to = battery_supplied_to;
 375         psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 376
 377         if (power_supply_register(pchg->dev, &psy->ac))
 378                 goto err_psy;
 379
 380         psy->usb.name = "usb";
 381         psy->usb.type = POWER_SUPPLY_TYPE_USB;
 382         psy->usb.properties = lp8727_charger_prop;
 383         psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 384         psy->usb.get_property = lp8727_charger_get_property;
 385         psy->usb.supplied_to = battery_supplied_to;
 386         psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 387
 388         if (power_supply_register(pchg->dev, &psy->usb))
 389                 goto err_psy;
 390
 391         psy->batt.name = "main_batt";
 392         psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
 393         psy->batt.properties = lp8727_battery_prop;
 394         psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
 395         psy->batt.get_property = lp8727_battery_get_property;
 396         psy->batt.external_power_changed = lp8727_charger_changed;
 397
 398         if (power_supply_register(pchg->dev, &psy->batt))
 399                 goto err_psy;
 400
 401         return 0;
 402
 403 err_mem:
 404         return -ENOMEM;
 405 err_psy:
 406         kfree(psy);
 407         return -EPERM;
 408 }
 409
 410 static void lp8727_unregister_psy(struct lp8727_chg *pchg)
 411 {
 412         struct lp8727_psy *psy = pchg->psy;
 413
 414         if (!psy)
 415                 return;
 416
 417         power_supply_unregister(&psy->ac);
 418         power_supply_unregister(&psy->usb);
 419         power_supply_unregister(&psy->batt);
 420         kfree(psy);
 421 }
 422
 423 static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 424 {
 425         struct lp8727_chg *pchg;
 426         int ret;
 427
 428         if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
 429                 return -EIO;
 430
 431         pchg = kzalloc(sizeof(*pchg), GFP_KERNEL);
 432         if (!pchg)
 433                 return -ENOMEM;
 434
 435         pchg->client = cl;
 436         pchg->dev = &cl->dev;
 437         pchg->pdata = cl->dev.platform_data;
 438         i2c_set_clientdata(cl, pchg);
 439
 440         mutex_init(&pchg->xfer_lock);
 441
 442         lp8727_init_device(pchg);
 443         lp8727_intr_config(pchg);
 444
 445         ret = lp8727_register_psy(pchg);
 446         if (ret)
 447                 dev_err(pchg->dev,
 448                         "can not register power supplies. err=%d", ret);
 449
 450         return 0;
 451 }
 452
 453 static int __devexit lp8727_remove(struct i2c_client *cl)
 454 {
 455         struct lp8727_chg *pchg = i2c_get_clientdata(cl);
 456
 457         lp8727_unregister_psy(pchg);
 458         free_irq(pchg->client->irq, pchg);
 459         flush_workqueue(pchg->irqthread);
 460         destroy_workqueue(pchg->irqthread);
 461         kfree(pchg);
 462         return 0;
 463 }
 464
 465 static const struct i2c_device_id lp8727_ids[] = {
 466         {"lp8727", 0},
 467 };
 468
 469 static struct i2c_driver lp8727_driver = {
 470         .driver = {
 471                    .name = "lp8727",
 472                    },
 473         .probe = lp8727_probe,
 474         .remove = __devexit_p(lp8727_remove),
 475         .id_table = lp8727_ids,
 476 };
 477
 478 static int __init lp8727_init(void)
 479 {
 480         return i2c_add_driver(&lp8727_driver);
 481 }
 482
 483 static void __exit lp8727_exit(void)
 484 {
 485         i2c_del_driver(&lp8727_driver);
 486 }
 487
 488 module_init(lp8727_init);
 489 module_exit(lp8727_exit);
 490
 491 MODULE_DESCRIPTION("National Semiconductor LP8727 charger driver");
 492 MODULE_AUTHOR
 493     ("Woogyom Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
 494 MODULE_LICENSE("GPL");