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/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_read_bytes(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 inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data)
 107 {
 108         return lp8727_read_bytes(pchg, reg, data, 1);
 109 }
 110
 111 static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
 112 {
 113         int ret;
 114
 115         mutex_lock(&pchg->xfer_lock);
 116         ret = i2c_smbus_write_byte_data(pchg->client, reg, data);
 117         mutex_unlock(&pchg->xfer_lock);
 118
 119         return ret;
 120 }
 121
 122 static int lp8727_is_charger_attached(const char *name, int id)
 123 {
 124         if (name) {
 125                 if (!strcmp(name, "ac"))
 126                         return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0;
 127                 else if (!strcmp(name, "usb"))
 128                         return (id == ID_USB_CHG) ? 1 : 0;
 129         }
 130
 131         return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
 132 }
 133
 134 static int lp8727_init_device(struct lp8727_chg *pchg)
 135 {
 136         u8 val;
 137         int ret;
 138
 139         val = ID200_EN | ADC_EN | CP_EN;
 140         ret = lp8727_write_byte(pchg, CTRL1, val);
 141         if (ret)
 142                 return ret;
 143
 144         val = INT_EN | CHGDET_EN;
 145         ret = lp8727_write_byte(pchg, CTRL2, val);
 146         if (ret)
 147                 return ret;
 148
 149         return 0;
 150 }
 151
 152 static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
 153 {
 154         u8 val;
 155         lp8727_read_byte(pchg, STATUS1, &val);
 156         return val & DCPORT;
 157 }
 158
 159 static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
 160 {
 161         u8 val;
 162         lp8727_read_byte(pchg, STATUS1, &val);
 163         return val & CHPORT;
 164 }
 165
 166 static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
 167 {
 168         lp8727_write_byte(pchg, SWCTRL, sw);
 169 }
 170
 171 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
 172 {
 173         u8 devid = ID_NONE;
 174         u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ;
 175
 176         switch (id) {
 177         case 0x5:
 178                 devid = ID_TA;
 179                 pchg->chg_parm = &pchg->pdata->ac;
 180                 break;
 181         case 0xB:
 182                 if (lp8727_is_dedicated_charger(pchg)) {
 183                         pchg->chg_parm = &pchg->pdata->ac;
 184                         devid = ID_DEDICATED_CHG;
 185                 } else if (lp8727_is_usb_charger(pchg)) {
 186                         pchg->chg_parm = &pchg->pdata->usb;
 187                         devid = ID_USB_CHG;
 188                         swctrl = SW_DM1_DM | SW_DP2_DP;
 189                 } else if (vbusin) {
 190                         devid = ID_USB_DS;
 191                         swctrl = SW_DM1_DM | SW_DP2_DP;
 192                 }
 193                 break;
 194         default:
 195                 devid = ID_NONE;
 196                 pchg->chg_parm = NULL;
 197                 break;
 198         }
 199
 200         pchg->devid = devid;
 201         lp8727_ctrl_switch(pchg, swctrl);
 202 }
 203
 204 static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
 205 {
 206         u8 val;
 207
 208         lp8727_read_byte(pchg, CTRL2, &val);
 209         val |= CHGDET_EN;
 210         lp8727_write_byte(pchg, CTRL2, val);
 211 }
 212
 213 static void lp8727_delayed_func(struct work_struct *_work)
 214 {
 215         u8 intstat[2], idno, vbus;
 216         struct lp8727_chg *pchg =
 217             container_of(_work, struct lp8727_chg, work.work);
 218
 219         if (lp8727_read_bytes(pchg, INT1, intstat, 2)) {
 220                 dev_err(pchg->dev, "can not read INT registers\n");
 221                 return;
 222         }
 223
 224         idno = intstat[0] & IDNO;
 225         vbus = intstat[0] & VBUS;
 226
 227         lp8727_id_detection(pchg, idno, vbus);
 228         lp8727_enable_chgdet(pchg);
 229
 230         power_supply_changed(&pchg->psy->ac);
 231         power_supply_changed(&pchg->psy->usb);
 232         power_supply_changed(&pchg->psy->batt);
 233 }
 234
 235 static irqreturn_t lp8727_isr_func(int irq, void *ptr)
 236 {
 237         struct lp8727_chg *pchg = ptr;
 238         unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);
 239
 240         queue_delayed_work(pchg->irqthread, &pchg->work, delay);
 241
 242         return IRQ_HANDLED;
 243 }
 244
 245 static int lp8727_intr_config(struct lp8727_chg *pchg)
 246 {
 247         INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
 248
 249         pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
 250         if (!pchg->irqthread) {
 251                 dev_err(pchg->dev, "can not create thread for lp8727\n");
 252                 return -ENOMEM;
 253         }
 254
 255         return request_threaded_irq(pchg->client->irq,
 256                                 NULL,
 257                                 lp8727_isr_func,
 258                                 IRQF_TRIGGER_FALLING,
 259                                 "lp8727_irq",
 260                                 pchg);
 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_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_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_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         ret = lp8727_init_device(pchg);
 443         if (ret) {
 444                 dev_err(pchg->dev, "i2c communication err: %d", ret);
 445                 goto error;
 446         }
 447
 448         ret = lp8727_intr_config(pchg);
 449         if (ret) {
 450                 dev_err(pchg->dev, "irq handler err: %d", ret);
 451                 goto error;
 452         }
 453
 454         ret = lp8727_register_psy(pchg);
 455         if (ret) {
 456                 dev_err(pchg->dev, "power supplies register err: %d", ret);
 457                 goto error;
 458         }
 459
 460         return 0;
 461
 462 error:
 463         kfree(pchg);
 464         return ret;
 465 }
 466
 467 static int __devexit lp8727_remove(struct i2c_client *cl)
 468 {
 469         struct lp8727_chg *pchg = i2c_get_clientdata(cl);
 470
 471         lp8727_unregister_psy(pchg);
 472         free_irq(pchg->client->irq, pchg);
 473         flush_workqueue(pchg->irqthread);
 474         destroy_workqueue(pchg->irqthread);
 475         kfree(pchg);
 476         return 0;
 477 }
 478
 479 static const struct i2c_device_id lp8727_ids[] = {
 480         {"lp8727", 0},
 481         { }
 482 };
 483 MODULE_DEVICE_TABLE(i2c, lp8727_ids);
 484
 485 static struct i2c_driver lp8727_driver = {
 486         .driver = {
 487                    .name = "lp8727",
 488                    },
 489         .probe = lp8727_probe,
 490         .remove = __devexit_p(lp8727_remove),
 491         .id_table = lp8727_ids,
 492 };
 493 module_i2c_driver(lp8727_driver);
 494
 495 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
 496 MODULE_AUTHOR("Woogyom Kim <milo.kim@ti.com>, "
 497               "Daniel Jeong <daniel.jeong@ti.com>");
 498 MODULE_LICENSE("GPL");