drivers/power/max8925_power.c

   1 /*
   2  * Battery driver for Maxim MAX8925
   3  *
   4  * Copyright (c) 2009-2010 Marvell International Ltd.
   5  *      Haojian Zhuang <haojian.zhuang@marvell.com>
   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 #include <linux/module.h>
  13 #include <linux/err.h>
  14 #include <linux/slab.h>
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/power_supply.h>
  19 #include <linux/mfd/max8925.h>
  20
  21 /* registers in GPM */
  22 #define MAX8925_OUT5VEN                 0x54
  23 #define MAX8925_OUT3VEN                 0x58
  24 #define MAX8925_CHG_CNTL1               0x7c
  25
  26 /* bits definition */
  27 #define MAX8925_CHG_STAT_VSYSLOW        (1 << 0)
  28 #define MAX8925_CHG_STAT_MODE_MASK      (3 << 2)
  29 #define MAX8925_CHG_STAT_EN_MASK        (1 << 4)
  30 #define MAX8925_CHG_MBDET               (1 << 1)
  31 #define MAX8925_CHG_AC_RANGE_MASK       (3 << 6)
  32
  33 /* registers in ADC */
  34 #define MAX8925_ADC_RES_CNFG1           0x06
  35 #define MAX8925_ADC_AVG_CNFG1           0x07
  36 #define MAX8925_ADC_ACQ_CNFG1           0x08
  37 #define MAX8925_ADC_ACQ_CNFG2           0x09
  38 /* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
  39 #define MAX8925_ADC_AUX2                0x62
  40 #define MAX8925_ADC_VCHG                0x64
  41 #define MAX8925_ADC_VBBATT              0x66
  42 #define MAX8925_ADC_VMBATT              0x68
  43 #define MAX8925_ADC_ISNS                0x6a
  44 #define MAX8925_ADC_THM                 0x6c
  45 #define MAX8925_ADC_TDIE                0x6e
  46 #define MAX8925_CMD_AUX2                0xc8
  47 #define MAX8925_CMD_VCHG                0xd0
  48 #define MAX8925_CMD_VBBATT              0xd8
  49 #define MAX8925_CMD_VMBATT              0xe0
  50 #define MAX8925_CMD_ISNS                0xe8
  51 #define MAX8925_CMD_THM                 0xf0
  52 #define MAX8925_CMD_TDIE                0xf8
  53
  54 enum {
  55         MEASURE_AUX2,
  56         MEASURE_VCHG,
  57         MEASURE_VBBATT,
  58         MEASURE_VMBATT,
  59         MEASURE_ISNS,
  60         MEASURE_THM,
  61         MEASURE_TDIE,
  62         MEASURE_MAX,
  63 };
  64
  65 struct max8925_power_info {
  66         struct max8925_chip     *chip;
  67         struct i2c_client       *gpm;
  68         struct i2c_client       *adc;
  69
  70         struct power_supply     ac;
  71         struct power_supply     usb;
  72         struct power_supply     battery;
  73         int                     irq_base;
  74         unsigned                ac_online:1;
  75         unsigned                usb_online:1;
  76         unsigned                bat_online:1;
  77         unsigned                chg_mode:2;
  78         unsigned                batt_detect:1;  /* detecing MB by ID pin */
  79         unsigned                topoff_threshold:2;
  80         unsigned                fast_charge:3;
  81         unsigned                no_temp_support:1;
  82         unsigned                no_insert_detect:1;
  83
  84         int (*set_charger) (int);
  85 };
  86
  87 static int __set_charger(struct max8925_power_info *info, int enable)
  88 {
  89         struct max8925_chip *chip = info->chip;
  90         if (enable) {
  91                 /* enable charger in platform */
  92                 if (info->set_charger)
  93                         info->set_charger(1);
  94                 /* enable charger */
  95                 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
  96         } else {
  97                 /* disable charge */
  98                 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
  99                 if (info->set_charger)
 100                         info->set_charger(0);
 101         }
 102         dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
 103                 : "Disable charger");
 104         return 0;
 105 }
 106
 107 static irqreturn_t max8925_charger_handler(int irq, void *data)
 108 {
 109         struct max8925_power_info *info = (struct max8925_power_info *)data;
 110         struct max8925_chip *chip = info->chip;
 111
 112         switch (irq - chip->irq_base) {
 113         case MAX8925_IRQ_VCHG_DC_R:
 114                 info->ac_online = 1;
 115                 __set_charger(info, 1);
 116                 dev_dbg(chip->dev, "Adapter inserted\n");
 117                 break;
 118         case MAX8925_IRQ_VCHG_DC_F:
 119                 info->ac_online = 0;
 120                 __set_charger(info, 0);
 121                 dev_dbg(chip->dev, "Adapter removed\n");
 122                 break;
 123         case MAX8925_IRQ_VCHG_USB_R:
 124                 info->usb_online = 1;
 125                 __set_charger(info, 1);
 126                 dev_dbg(chip->dev, "USB inserted\n");
 127                 break;
 128         case MAX8925_IRQ_VCHG_USB_F:
 129                 info->usb_online = 0;
 130                 __set_charger(info, 0);
 131                 dev_dbg(chip->dev, "USB removed\n");
 132                 break;
 133         case MAX8925_IRQ_VCHG_THM_OK_F:
 134                 /* Battery is not ready yet */
 135                 dev_dbg(chip->dev, "Battery temperature is out of range\n");
 136         case MAX8925_IRQ_VCHG_DC_OVP:
 137                 dev_dbg(chip->dev, "Error detection\n");
 138                 __set_charger(info, 0);
 139                 break;
 140         case MAX8925_IRQ_VCHG_THM_OK_R:
 141                 /* Battery is ready now */
 142                 dev_dbg(chip->dev, "Battery temperature is in range\n");
 143                 break;
 144         case MAX8925_IRQ_VCHG_SYSLOW_R:
 145                 /* VSYS is low */
 146                 dev_info(chip->dev, "Sys power is too low\n");
 147                 break;
 148         case MAX8925_IRQ_VCHG_SYSLOW_F:
 149                 dev_dbg(chip->dev, "Sys power is above low threshold\n");
 150                 break;
 151         case MAX8925_IRQ_VCHG_DONE:
 152                 __set_charger(info, 0);
 153                 dev_dbg(chip->dev, "Charging is done\n");
 154                 break;
 155         case MAX8925_IRQ_VCHG_TOPOFF:
 156                 dev_dbg(chip->dev, "Charging in top-off mode\n");
 157                 break;
 158         case MAX8925_IRQ_VCHG_TMR_FAULT:
 159                 __set_charger(info, 0);
 160                 dev_dbg(chip->dev, "Safe timer is expired\n");
 161                 break;
 162         case MAX8925_IRQ_VCHG_RST:
 163                 __set_charger(info, 0);
 164                 dev_dbg(chip->dev, "Charger is reset\n");
 165                 break;
 166         }
 167         return IRQ_HANDLED;
 168 }
 169
 170 static int start_measure(struct max8925_power_info *info, int type)
 171 {
 172         unsigned char buf[2] = {0, 0};
 173         int meas_reg = 0, ret;
 174
 175         switch (type) {
 176         case MEASURE_VCHG:
 177                 meas_reg = MAX8925_ADC_VCHG;
 178                 break;
 179         case MEASURE_VBBATT:
 180                 meas_reg = MAX8925_ADC_VBBATT;
 181                 break;
 182         case MEASURE_VMBATT:
 183                 meas_reg = MAX8925_ADC_VMBATT;
 184                 break;
 185         case MEASURE_ISNS:
 186                 meas_reg = MAX8925_ADC_ISNS;
 187                 break;
 188         default:
 189                 return -EINVAL;
 190         }
 191
 192         max8925_bulk_read(info->adc, meas_reg, 2, buf);
 193         ret = ((buf[0]<<8) | buf[1]) >> 4;
 194
 195         return ret;
 196 }
 197
 198 static int max8925_ac_get_prop(struct power_supply *psy,
 199                                enum power_supply_property psp,
 200                                union power_supply_propval *val)
 201 {
 202         struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 203         int ret = 0;
 204
 205         switch (psp) {
 206         case POWER_SUPPLY_PROP_ONLINE:
 207                 val->intval = info->ac_online;
 208                 break;
 209         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 210                 if (info->ac_online) {
 211                         ret = start_measure(info, MEASURE_VCHG);
 212                         if (ret >= 0) {
 213                                 val->intval = ret * 2000;       /* unit is uV */
 214                                 goto out;
 215                         }
 216                 }
 217                 ret = -ENODATA;
 218                 break;
 219         default:
 220                 ret = -ENODEV;
 221                 break;
 222         }
 223 out:
 224         return ret;
 225 }
 226
 227 static enum power_supply_property max8925_ac_props[] = {
 228         POWER_SUPPLY_PROP_ONLINE,
 229         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 230 };
 231
 232 static int max8925_usb_get_prop(struct power_supply *psy,
 233                                 enum power_supply_property psp,
 234                                 union power_supply_propval *val)
 235 {
 236         struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 237         int ret = 0;
 238
 239         switch (psp) {
 240         case POWER_SUPPLY_PROP_ONLINE:
 241                 val->intval = info->usb_online;
 242                 break;
 243         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 244                 if (info->usb_online) {
 245                         ret = start_measure(info, MEASURE_VCHG);
 246                         if (ret >= 0) {
 247                                 val->intval = ret * 2000;       /* unit is uV */
 248                                 goto out;
 249                         }
 250                 }
 251                 ret = -ENODATA;
 252                 break;
 253         default:
 254                 ret = -ENODEV;
 255                 break;
 256         }
 257 out:
 258         return ret;
 259 }
 260
 261 static enum power_supply_property max8925_usb_props[] = {
 262         POWER_SUPPLY_PROP_ONLINE,
 263         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 264 };
 265
 266 static int max8925_bat_get_prop(struct power_supply *psy,
 267                                 enum power_supply_property psp,
 268                                 union power_supply_propval *val)
 269 {
 270         struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 271         int ret = 0;
 272
 273         switch (psp) {
 274         case POWER_SUPPLY_PROP_ONLINE:
 275                 val->intval = info->bat_online;
 276                 break;
 277         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 278                 if (info->bat_online) {
 279                         ret = start_measure(info, MEASURE_VMBATT);
 280                         if (ret >= 0) {
 281                                 val->intval = ret * 2000;       /* unit is uV */
 282                                 ret = 0;
 283                                 break;
 284                         }
 285                 }
 286                 ret = -ENODATA;
 287                 break;
 288         case POWER_SUPPLY_PROP_CURRENT_NOW:
 289                 if (info->bat_online) {
 290                         ret = start_measure(info, MEASURE_ISNS);
 291                         if (ret >= 0) {
 292                                 /* assume r_sns is 0.02 */
 293                                 ret = ((ret * 6250) - 3125) /* uA */;
 294                                 val->intval = 0;
 295                                 if (ret > 0)
 296                                         val->intval = ret; /* unit is mA */
 297                                 ret = 0;
 298                                 break;
 299                         }
 300                 }
 301                 ret = -ENODATA;
 302                 break;
 303         case POWER_SUPPLY_PROP_CHARGE_TYPE:
 304                 if (!info->bat_online) {
 305                         ret = -ENODATA;
 306                         break;
 307                 }
 308                 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 309                 ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
 310                 switch (ret) {
 311                 case 1:
 312                         val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
 313                         break;
 314                 case 0:
 315                 case 2:
 316                         val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 317                         break;
 318                 case 3:
 319                         val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
 320                         break;
 321                 }
 322                 ret = 0;
 323                 break;
 324         case POWER_SUPPLY_PROP_STATUS:
 325                 if (!info->bat_online) {
 326                         ret = -ENODATA;
 327                         break;
 328                 }
 329                 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 330                 if (info->usb_online || info->ac_online) {
 331                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 332                         if (ret & MAX8925_CHG_STAT_EN_MASK)
 333                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
 334                 } else
 335                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 336                 ret = 0;
 337                 break;
 338         default:
 339                 ret = -ENODEV;
 340                 break;
 341         }
 342         return ret;
 343 }
 344
 345 static enum power_supply_property max8925_battery_props[] = {
 346         POWER_SUPPLY_PROP_ONLINE,
 347         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 348         POWER_SUPPLY_PROP_CURRENT_NOW,
 349         POWER_SUPPLY_PROP_CHARGE_TYPE,
 350         POWER_SUPPLY_PROP_STATUS,
 351 };
 352
 353 #define REQUEST_IRQ(_irq, _name)                                        \
 354 do {                                                                    \
 355         ret = request_threaded_irq(chip->irq_base + _irq, NULL,         \
 356                                     max8925_charger_handler,            \
 357                                     IRQF_ONESHOT, _name, info);         \
 358         if (ret)                                                        \
 359                 dev_err(chip->dev, "Failed to request IRQ #%d: %d\n",   \
 360                         _irq, ret);                                     \
 361 } while (0)
 362
 363 static __devinit int max8925_init_charger(struct max8925_chip *chip,
 364                                           struct max8925_power_info *info)
 365 {
 366         int ret;
 367
 368         REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
 369         if (!info->no_insert_detect) {
 370                 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
 371                 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
 372         }
 373         REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_OVP, "usb-ovp");
 374         REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_F, "usb-remove");
 375         REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_R, "usb-insert");
 376         if (!info->no_temp_support) {
 377                 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
 378                 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
 379         }
 380         REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
 381         REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
 382         REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
 383         REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
 384         REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
 385         REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
 386
 387         info->ac_online = 0;
 388         info->usb_online = 0;
 389         info->bat_online = 0;
 390         ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 391         if (ret >= 0) {
 392                 /*
 393                  * If battery detection is enabled, ID pin of battery is
 394                  * connected to MBDET pin of MAX8925. It could be used to
 395                  * detect battery presence.
 396                  * Otherwise, we have to assume that battery is always on.
 397                  */
 398                 if (info->batt_detect)
 399                         info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
 400                 else
 401                         info->bat_online = 1;
 402                 if (ret & MAX8925_CHG_AC_RANGE_MASK)
 403                         info->ac_online = 1;
 404                 else
 405                         info->ac_online = 0;
 406         }
 407         /* disable charge */
 408         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
 409         /* set charging current in charge topoff mode */
 410         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
 411                          info->topoff_threshold << 5);
 412         /* set charing current in fast charge mode */
 413         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
 414
 415         return 0;
 416 }
 417
 418 static __devexit int max8925_deinit_charger(struct max8925_power_info *info)
 419 {
 420         struct max8925_chip *chip = info->chip;
 421         int irq;
 422
 423         irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
 424         for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
 425                 free_irq(irq, info);
 426
 427         return 0;
 428 }
 429
 430 static __devinit int max8925_power_probe(struct platform_device *pdev)
 431 {
 432         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 433         struct max8925_power_pdata *pdata = NULL;
 434         struct max8925_power_info *info;
 435         int ret;
 436
 437         pdata = pdev->dev.platform_data;
 438         if (!pdata) {
 439                 dev_err(&pdev->dev, "platform data isn't assigned to "
 440                         "power supply\n");
 441                 return -EINVAL;
 442         }
 443
 444         info = kzalloc(sizeof(struct max8925_power_info), GFP_KERNEL);
 445         if (!info)
 446                 return -ENOMEM;
 447         info->chip = chip;
 448         info->gpm = chip->i2c;
 449         info->adc = chip->adc;
 450         platform_set_drvdata(pdev, info);
 451
 452         info->ac.name = "max8925-ac";
 453         info->ac.type = POWER_SUPPLY_TYPE_MAINS;
 454         info->ac.properties = max8925_ac_props;
 455         info->ac.num_properties = ARRAY_SIZE(max8925_ac_props);
 456         info->ac.get_property = max8925_ac_get_prop;
 457         ret = power_supply_register(&pdev->dev, &info->ac);
 458         if (ret)
 459                 goto out;
 460         info->ac.dev->parent = &pdev->dev;
 461
 462         info->usb.name = "max8925-usb";
 463         info->usb.type = POWER_SUPPLY_TYPE_USB;
 464         info->usb.properties = max8925_usb_props;
 465         info->usb.num_properties = ARRAY_SIZE(max8925_usb_props);
 466         info->usb.get_property = max8925_usb_get_prop;
 467         ret = power_supply_register(&pdev->dev, &info->usb);
 468         if (ret)
 469                 goto out_usb;
 470         info->usb.dev->parent = &pdev->dev;
 471
 472         info->battery.name = "max8925-battery";
 473         info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 474         info->battery.properties = max8925_battery_props;
 475         info->battery.num_properties = ARRAY_SIZE(max8925_battery_props);
 476         info->battery.get_property = max8925_bat_get_prop;
 477         ret = power_supply_register(&pdev->dev, &info->battery);
 478         if (ret)
 479                 goto out_battery;
 480         info->battery.dev->parent = &pdev->dev;
 481
 482         info->batt_detect = pdata->batt_detect;
 483         info->topoff_threshold = pdata->topoff_threshold;
 484         info->fast_charge = pdata->fast_charge;
 485         info->set_charger = pdata->set_charger;
 486         info->no_temp_support = pdata->no_temp_support;
 487         info->no_insert_detect = pdata->no_insert_detect;
 488
 489         max8925_init_charger(chip, info);
 490         return 0;
 491 out_battery:
 492         power_supply_unregister(&info->battery);
 493 out_usb:
 494         power_supply_unregister(&info->ac);
 495 out:
 496         kfree(info);
 497         return ret;
 498 }
 499
 500 static __devexit int max8925_power_remove(struct platform_device *pdev)
 501 {
 502         struct max8925_power_info *info = platform_get_drvdata(pdev);
 503
 504         if (info) {
 505                 power_supply_unregister(&info->ac);
 506                 power_supply_unregister(&info->usb);
 507                 power_supply_unregister(&info->battery);
 508                 max8925_deinit_charger(info);
 509                 kfree(info);
 510         }
 511         return 0;
 512 }
 513
 514 static struct platform_driver max8925_power_driver = {
 515         .probe  = max8925_power_probe,
 516         .remove = __devexit_p(max8925_power_remove),
 517         .driver = {
 518                 .name   = "max8925-power",
 519         },
 520 };
 521
 522 static int __init max8925_power_init(void)
 523 {
 524         return platform_driver_register(&max8925_power_driver);
 525 }
 526 module_init(max8925_power_init);
 527
 528 static void __exit max8925_power_exit(void)
 529 {
 530         platform_driver_unregister(&max8925_power_driver);
 531 }
 532 module_exit(max8925_power_exit);
 533
 534 MODULE_LICENSE("GPL");
 535 MODULE_DESCRIPTION("Power supply driver for MAX8925");
 536 MODULE_ALIAS("platform:max8925-power");