drivers/power/lp8727_charger.c

   1 /*
   2  * Driver for LP8727 Micro/Mini USB IC with intergrated 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/lp8727.h>
  19
  20 #define 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 workqueue_struct *irqthread;
  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 };
  94
  95 static int lp8727_i2c_read(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
  96 {
  97         s32 ret;
  98
  99         mutex_lock(&pchg->xfer_lock);
 100         ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
 101         mutex_unlock(&pchg->xfer_lock);
 102
 103         return (ret != len) ? -EIO : 0;
 104 }
 105
 106 static int lp8727_i2c_write(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
 107 {
 108         s32 ret;
 109
 110         mutex_lock(&pchg->xfer_lock);
 111         ret = i2c_smbus_write_i2c_block_data(pchg->client, reg, len, data);
 112         mutex_unlock(&pchg->xfer_lock);
 113
 114         return ret;
 115 }
 116
 117 static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg,
 118                                        u8 *data)
 119 {
 120         return lp8727_i2c_read(pchg, reg, data, 1);
 121 }
 122
 123 static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg,
 124                                         u8 *data)
 125 {
 126         return lp8727_i2c_write(pchg, reg, data, 1);
 127 }
 128
 129 static int lp8727_is_charger_attached(const char *name, int id)
 130 {
 131         if (name) {
 132                 if (!strcmp(name, "ac"))
 133                         return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0;
 134                 else if (!strcmp(name, "usb"))
 135                         return (id == ID_USB_CHG) ? 1 : 0;
 136         }
 137
 138         return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
 139 }
 140
 141 static void lp8727_init_device(struct lp8727_chg *pchg)
 142 {
 143         u8 val;
 144
 145         val = ID200_EN | ADC_EN | CP_EN;
 146         if (lp8727_i2c_write_byte(pchg, CTRL1, &val))
 147                 dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL1);
 148
 149         val = INT_EN | CHGDET_EN;
 150         if (lp8727_i2c_write_byte(pchg, CTRL2, &val))
 151                 dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL2);
 152 }
 153
 154 static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
 155 {
 156         u8 val;
 157         lp8727_i2c_read_byte(pchg, STATUS1, &val);
 158         return (val & DCPORT);
 159 }
 160
 161 static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
 162 {
 163         u8 val;
 164         lp8727_i2c_read_byte(pchg, STATUS1, &val);
 165         return (val & CHPORT);
 166 }
 167
 168 static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
 169 {
 170         u8 val = sw;
 171         lp8727_i2c_write_byte(pchg, SWCTRL, &val);
 172 }
 173
 174 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
 175 {
 176         u8 devid = ID_NONE;
 177         u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ;
 178
 179         switch (id) {
 180         case 0x5:
 181                 devid = ID_TA;
 182                 pchg->chg_parm = &pchg->pdata->ac;
 183                 break;
 184         case 0xB:
 185                 if (lp8727_is_dedicated_charger(pchg)) {
 186                         pchg->chg_parm = &pchg->pdata->ac;
 187                         devid = ID_DEDICATED_CHG;
 188                 } else if (lp8727_is_usb_charger(pchg)) {
 189                         pchg->chg_parm = &pchg->pdata->usb;
 190                         devid = ID_USB_CHG;
 191                         swctrl = SW_DM1_DM | SW_DP2_DP;
 192                 } else if (vbusin) {
 193                         devid = ID_USB_DS;
 194                         swctrl = SW_DM1_DM | SW_DP2_DP;
 195                 }
 196                 break;
 197         default:
 198                 devid = ID_NONE;
 199                 pchg->chg_parm = NULL;
 200                 break;
 201         }
 202
 203         pchg->devid = devid;
 204         lp8727_ctrl_switch(pchg, swctrl);
 205 }
 206
 207 static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
 208 {
 209         u8 val;
 210
 211         lp8727_i2c_read_byte(pchg, CTRL2, &val);
 212         val |= CHGDET_EN;
 213         lp8727_i2c_write_byte(pchg, CTRL2, &val);
 214 }
 215
 216 static void lp8727_delayed_func(struct work_struct *_work)
 217 {
 218         u8 intstat[2], idno, vbus;
 219         struct lp8727_chg *pchg =
 220             container_of(_work, struct lp8727_chg, work.work);
 221
 222         if (lp8727_i2c_read(pchg, INT1, intstat, 2)) {
 223                 dev_err(pchg->dev, "can not read INT registers\n");
 224                 return;
 225         }
 226
 227         idno = intstat[0] & IDNO;
 228         vbus = intstat[0] & VBUS;
 229
 230         lp8727_id_detection(pchg, idno, vbus);
 231         lp8727_enable_chgdet(pchg);
 232
 233         power_supply_changed(&pchg->psy->ac);
 234         power_supply_changed(&pchg->psy->usb);
 235         power_supply_changed(&pchg->psy->batt);
 236 }
 237
 238 static irqreturn_t lp8727_isr_func(int irq, void *ptr)
 239 {
 240         struct lp8727_chg *pchg = ptr;
 241         unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);
 242
 243         queue_delayed_work(pchg->irqthread, &pchg->work, delay);
 244
 245         return IRQ_HANDLED;
 246 }
 247
 248 static void lp8727_intr_config(struct lp8727_chg *pchg)
 249 {
 250         INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
 251
 252         pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
 253         if (!pchg->irqthread)
 254                 dev_err(pchg->dev, "can not create thread for lp8727\n");
 255
 256         if (request_threaded_irq(pchg->client->irq,
 257                                  NULL,
 258                                  lp8727_isr_func,
 259                                  IRQF_TRIGGER_FALLING, "lp8727_irq", pchg)) {
 260                 dev_err(pchg->dev, "lp8727 irq can not be registered\n");
 261         }
 262 }
 263
 264 static enum power_supply_property lp8727_charger_prop[] = {
 265         POWER_SUPPLY_PROP_ONLINE,
 266 };
 267
 268 static enum power_supply_property lp8727_battery_prop[] = {
 269         POWER_SUPPLY_PROP_STATUS,
 270         POWER_SUPPLY_PROP_HEALTH,
 271         POWER_SUPPLY_PROP_PRESENT,
 272         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 273         POWER_SUPPLY_PROP_CAPACITY,
 274         POWER_SUPPLY_PROP_TEMP,
 275 };
 276
 277 static char *battery_supplied_to[] = {
 278         "main_batt",
 279 };
 280
 281 static int lp8727_charger_get_property(struct power_supply *psy,
 282                                        enum power_supply_property psp,
 283                                        union power_supply_propval *val)
 284 {
 285         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 286
 287         if (psp == POWER_SUPPLY_PROP_ONLINE)
 288                 val->intval = lp8727_is_charger_attached(psy->name,
 289                                                          pchg->devid);
 290
 291         return 0;
 292 }
 293
 294 static int lp8727_battery_get_property(struct power_supply *psy,
 295                                        enum power_supply_property psp,
 296                                        union power_supply_propval *val)
 297 {
 298         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 299         u8 read;
 300
 301         switch (psp) {
 302         case POWER_SUPPLY_PROP_STATUS:
 303                 if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
 304                         lp8727_i2c_read_byte(pchg, STATUS1, &read);
 305                         if (((read & CHGSTAT) >> 4) == EOC)
 306                                 val->intval = POWER_SUPPLY_STATUS_FULL;
 307                         else
 308                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
 309                 } else {
 310                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 311                 }
 312                 break;
 313         case POWER_SUPPLY_PROP_HEALTH:
 314                 lp8727_i2c_read_byte(pchg, STATUS2, &read);
 315                 read = (read & TEMP_STAT) >> 5;
 316                 if (read >= 0x1 && read <= 0x3)
 317                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 318                 else
 319                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 320                 break;
 321         case POWER_SUPPLY_PROP_PRESENT:
 322                 if (pchg->pdata->get_batt_present)
 323                         val->intval = pchg->pdata->get_batt_present();
 324                 break;
 325         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 326                 if (pchg->pdata->get_batt_level)
 327                         val->intval = pchg->pdata->get_batt_level();
 328                 break;
 329         case POWER_SUPPLY_PROP_CAPACITY:
 330                 if (pchg->pdata->get_batt_capacity)
 331                         val->intval = pchg->pdata->get_batt_capacity();
 332                 break;
 333         case POWER_SUPPLY_PROP_TEMP:
 334                 if (pchg->pdata->get_batt_temp)
 335                         val->intval = pchg->pdata->get_batt_temp();
 336                 break;
 337         default:
 338                 break;
 339         }
 340
 341         return 0;
 342 }
 343
 344 static void lp8727_charger_changed(struct power_supply *psy)
 345 {
 346         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 347         u8 val;
 348         u8 eoc_level, ichg;
 349
 350         if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
 351                 if (pchg->chg_parm) {
 352                         eoc_level = pchg->chg_parm->eoc_level;
 353                         ichg = pchg->chg_parm->ichg;
 354                         val = (ichg << 4) | eoc_level;
 355                         lp8727_i2c_write_byte(pchg, CHGCTRL2, &val);
 356                 }
 357         }
 358 }
 359
 360 static int lp8727_register_psy(struct lp8727_chg *pchg)
 361 {
 362         struct lp8727_psy *psy;
 363
 364         psy = kzalloc(sizeof(*psy), GFP_KERNEL);
 365         if (!psy)
 366                 goto err_mem;
 367
 368         pchg->psy = psy;
 369
 370         psy->ac.name = "ac";
 371         psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
 372         psy->ac.properties = lp8727_charger_prop;
 373         psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 374         psy->ac.get_property = lp8727_charger_get_property;
 375         psy->ac.supplied_to = battery_supplied_to;
 376         psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 377
 378         if (power_supply_register(pchg->dev, &psy->ac))
 379                 goto err_psy;
 380
 381         psy->usb.name = "usb";
 382         psy->usb.type = POWER_SUPPLY_TYPE_USB;
 383         psy->usb.properties = lp8727_charger_prop;
 384         psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 385         psy->usb.get_property = lp8727_charger_get_property;
 386         psy->usb.supplied_to = battery_supplied_to;
 387         psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 388
 389         if (power_supply_register(pchg->dev, &psy->usb))
 390                 goto err_psy;
 391
 392         psy->batt.name = "main_batt";
 393         psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
 394         psy->batt.properties = lp8727_battery_prop;
 395         psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
 396         psy->batt.get_property = lp8727_battery_get_property;
 397         psy->batt.external_power_changed = lp8727_charger_changed;
 398
 399         if (power_supply_register(pchg->dev, &psy->batt))
 400                 goto err_psy;
 401
 402         return 0;
 403
 404 err_mem:
 405         return -ENOMEM;
 406 err_psy:
 407         kfree(psy);
 408         return -EPERM;
 409 }
 410
 411 static void lp8727_unregister_psy(struct lp8727_chg *pchg)
 412 {
 413         struct lp8727_psy *psy = pchg->psy;
 414
 415         if (!psy)
 416                 return;
 417
 418         power_supply_unregister(&psy->ac);
 419         power_supply_unregister(&psy->usb);
 420         power_supply_unregister(&psy->batt);
 421         kfree(psy);
 422 }
 423
 424 static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 425 {
 426         struct lp8727_chg *pchg;
 427         int ret;
 428
 429         if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
 430                 return -EIO;
 431
 432         pchg = kzalloc(sizeof(*pchg), GFP_KERNEL);
 433         if (!pchg)
 434                 return -ENOMEM;
 435
 436         pchg->client = cl;
 437         pchg->dev = &cl->dev;
 438         pchg->pdata = cl->dev.platform_data;
 439         i2c_set_clientdata(cl, pchg);
 440
 441         mutex_init(&pchg->xfer_lock);
 442
 443         lp8727_init_device(pchg);
 444         lp8727_intr_config(pchg);
 445
 446         ret = lp8727_register_psy(pchg);
 447         if (ret)
 448                 dev_err(pchg->dev,
 449                         "can not register power supplies. err=%d", ret);
 450
 451         return 0;
 452 }
 453
 454 static int __devexit lp8727_remove(struct i2c_client *cl)
 455 {
 456         struct lp8727_chg *pchg = i2c_get_clientdata(cl);
 457
 458         lp8727_unregister_psy(pchg);
 459         free_irq(pchg->client->irq, pchg);
 460         flush_workqueue(pchg->irqthread);
 461         destroy_workqueue(pchg->irqthread);
 462         kfree(pchg);
 463         return 0;
 464 }
 465
 466 static const struct i2c_device_id lp8727_ids[] = {
 467         {"lp8727", 0},
 468         { }
 469 };
 470
 471 static struct i2c_driver lp8727_driver = {
 472         .driver = {
 473                    .name = "lp8727",
 474                    },
 475         .probe = lp8727_probe,
 476         .remove = __devexit_p(lp8727_remove),
 477         .id_table = lp8727_ids,
 478 };
 479
 480 static int __init lp8727_init(void)
 481 {
 482         return i2c_add_driver(&lp8727_driver);
 483 }
 484
 485 static void __exit lp8727_exit(void)
 486 {
 487         i2c_del_driver(&lp8727_driver);
 488 }
 489
 490 module_init(lp8727_init);
 491 module_exit(lp8727_exit);
 492
 493 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
 494 MODULE_AUTHOR
 495     ("Woogyom Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
 496 MODULE_LICENSE("GPL");