linux/drivers/power/lp8727_charger.c
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   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 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
  61enum 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
  70enum lp8727_chg_stat {
  71        PRECHG,
  72        CC,
  73        CV,
  74        EOC,
  75};
  76
  77struct lp8727_psy {
  78        struct power_supply ac;
  79        struct power_supply usb;
  80        struct power_supply batt;
  81};
  82
  83struct 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
  95static 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
 106static 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
 111static 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
 122static 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
 134static 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
 152static 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
 159static 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
 166static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
 167{
 168        lp8727_write_byte(pchg, SWCTRL, sw);
 169}
 170
 171static 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
 204static 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
 213static 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
 235static 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
 245static 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
 263static enum power_supply_property lp8727_charger_prop[] = {
 264        POWER_SUPPLY_PROP_ONLINE,
 265};
 266
 267static 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
 276static char *battery_supplied_to[] = {
 277        "main_batt",
 278};
 279
 280static 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
 293static 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
 343static 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
 359static 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
 403err_mem:
 404        return -ENOMEM;
 405err_psy:
 406        kfree(psy);
 407        return -EPERM;
 408}
 409
 410static 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
 423static 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
 462error:
 463        kfree(pchg);
 464        return ret;
 465}
 466
 467static 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
 479static const struct i2c_device_id lp8727_ids[] = {
 480        {"lp8727", 0},
 481        { }
 482};
 483MODULE_DEVICE_TABLE(i2c, lp8727_ids);
 484
 485static 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};
 493module_i2c_driver(lp8727_driver);
 494
 495MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
 496MODULE_AUTHOR("Woogyom Kim <milo.kim@ti.com>, "
 497              "Daniel Jeong <daniel.jeong@ti.com>");
 498MODULE_LICENSE("GPL");
 499
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