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_THM_OK_F:
 124                 /* Battery is not ready yet */
 125                 dev_dbg(chip->dev, "Battery temperature is out of range\n");
 126         case MAX8925_IRQ_VCHG_DC_OVP:
 127                 dev_dbg(chip->dev, "Error detection\n");
 128                 __set_charger(info, 0);
 129                 break;
 130         case MAX8925_IRQ_VCHG_THM_OK_R:
 131                 /* Battery is ready now */
 132                 dev_dbg(chip->dev, "Battery temperature is in range\n");
 133                 break;
 134         case MAX8925_IRQ_VCHG_SYSLOW_R:
 135                 /* VSYS is low */
 136                 dev_info(chip->dev, "Sys power is too low\n");
 137                 break;
 138         case MAX8925_IRQ_VCHG_SYSLOW_F:
 139                 dev_dbg(chip->dev, "Sys power is above low threshold\n");
 140                 break;
 141         case MAX8925_IRQ_VCHG_DONE:
 142                 __set_charger(info, 0);
 143                 dev_dbg(chip->dev, "Charging is done\n");
 144                 break;
 145         case MAX8925_IRQ_VCHG_TOPOFF:
 146                 dev_dbg(chip->dev, "Charging in top-off mode\n");
 147                 break;
 148         case MAX8925_IRQ_VCHG_TMR_FAULT:
 149                 __set_charger(info, 0);
 150                 dev_dbg(chip->dev, "Safe timer is expired\n");
 151                 break;
 152         case MAX8925_IRQ_VCHG_RST:
 153                 __set_charger(info, 0);
 154                 dev_dbg(chip->dev, "Charger is reset\n");
 155                 break;
 156         }
 157         return IRQ_HANDLED;
 158 }
 159
 160 static int start_measure(struct max8925_power_info *info, int type)
 161 {
 162         unsigned char buf[2] = {0, 0};
 163         int meas_cmd;
 164         int meas_reg = 0, ret;
 165
 166         switch (type) {
 167         case MEASURE_VCHG:
 168                 meas_cmd = MAX8925_CMD_VCHG;
 169                 meas_reg = MAX8925_ADC_VCHG;
 170                 break;
 171         case MEASURE_VBBATT:
 172                 meas_cmd = MAX8925_CMD_VBBATT;
 173                 meas_reg = MAX8925_ADC_VBBATT;
 174                 break;
 175         case MEASURE_VMBATT:
 176                 meas_cmd = MAX8925_CMD_VMBATT;
 177                 meas_reg = MAX8925_ADC_VMBATT;
 178                 break;
 179         case MEASURE_ISNS:
 180                 meas_cmd = MAX8925_CMD_ISNS;
 181                 meas_reg = MAX8925_ADC_ISNS;
 182                 break;
 183         default:
 184                 return -EINVAL;
 185         }
 186
 187         max8925_reg_write(info->adc, meas_cmd, 0);
 188         max8925_bulk_read(info->adc, meas_reg, 2, buf);
 189         ret = ((buf[0]<<8) | buf[1]) >> 4;
 190
 191         return ret;
 192 }
 193
 194 static int max8925_ac_get_prop(struct power_supply *psy,
 195                                enum power_supply_property psp,
 196                                union power_supply_propval *val)
 197 {
 198         struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 199         int ret = 0;
 200
 201         switch (psp) {
 202         case POWER_SUPPLY_PROP_ONLINE:
 203                 val->intval = info->ac_online;
 204                 break;
 205         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 206                 if (info->ac_online) {
 207                         ret = start_measure(info, MEASURE_VCHG);
 208                         if (ret >= 0) {
 209                                 val->intval = ret * 2000;       /* unit is uV */
 210                                 goto out;
 211                         }
 212                 }
 213                 ret = -ENODATA;
 214                 break;
 215         default:
 216                 ret = -ENODEV;
 217                 break;
 218         }
 219 out:
 220         return ret;
 221 }
 222
 223 static enum power_supply_property max8925_ac_props[] = {
 224         POWER_SUPPLY_PROP_ONLINE,
 225         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 226 };
 227
 228 static int max8925_usb_get_prop(struct power_supply *psy,
 229                                 enum power_supply_property psp,
 230                                 union power_supply_propval *val)
 231 {
 232         struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 233         int ret = 0;
 234
 235         switch (psp) {
 236         case POWER_SUPPLY_PROP_ONLINE:
 237                 val->intval = info->usb_online;
 238                 break;
 239         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 240                 if (info->usb_online) {
 241                         ret = start_measure(info, MEASURE_VCHG);
 242                         if (ret >= 0) {
 243                                 val->intval = ret * 2000;       /* unit is uV */
 244                                 goto out;
 245                         }
 246                 }
 247                 ret = -ENODATA;
 248                 break;
 249         default:
 250                 ret = -ENODEV;
 251                 break;
 252         }
 253 out:
 254         return ret;
 255 }
 256
 257 static enum power_supply_property max8925_usb_props[] = {
 258         POWER_SUPPLY_PROP_ONLINE,
 259         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 260 };
 261
 262 static int max8925_bat_get_prop(struct power_supply *psy,
 263                                 enum power_supply_property psp,
 264                                 union power_supply_propval *val)
 265 {
 266         struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
 267         int ret = 0;
 268
 269         switch (psp) {
 270         case POWER_SUPPLY_PROP_ONLINE:
 271                 val->intval = info->bat_online;
 272                 break;
 273         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 274                 if (info->bat_online) {
 275                         ret = start_measure(info, MEASURE_VMBATT);
 276                         if (ret >= 0) {
 277                                 val->intval = ret * 2000;       /* unit is uV */
 278                                 ret = 0;
 279                                 break;
 280                         }
 281                 }
 282                 ret = -ENODATA;
 283                 break;
 284         case POWER_SUPPLY_PROP_CURRENT_NOW:
 285                 if (info->bat_online) {
 286                         ret = start_measure(info, MEASURE_ISNS);
 287                         if (ret >= 0) {
 288                                 /* assume r_sns is 0.02 */
 289                                 ret = ((ret * 6250) - 3125) /* uA */;
 290                                 val->intval = 0;
 291                                 if (ret > 0)
 292                                         val->intval = ret; /* unit is mA */
 293                                 ret = 0;
 294                                 break;
 295                         }
 296                 }
 297                 ret = -ENODATA;
 298                 break;
 299         case POWER_SUPPLY_PROP_CHARGE_TYPE:
 300                 if (!info->bat_online) {
 301                         ret = -ENODATA;
 302                         break;
 303                 }
 304                 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 305                 ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
 306                 switch (ret) {
 307                 case 1:
 308                         val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
 309                         break;
 310                 case 0:
 311                 case 2:
 312                         val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 313                         break;
 314                 case 3:
 315                         val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
 316                         break;
 317                 }
 318                 ret = 0;
 319                 break;
 320         case POWER_SUPPLY_PROP_STATUS:
 321                 if (!info->bat_online) {
 322                         ret = -ENODATA;
 323                         break;
 324                 }
 325                 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 326                 if (info->usb_online || info->ac_online) {
 327                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 328                         if (ret & MAX8925_CHG_STAT_EN_MASK)
 329                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
 330                 } else
 331                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 332                 ret = 0;
 333                 break;
 334         default:
 335                 ret = -ENODEV;
 336                 break;
 337         }
 338         return ret;
 339 }
 340
 341 static enum power_supply_property max8925_battery_props[] = {
 342         POWER_SUPPLY_PROP_ONLINE,
 343         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 344         POWER_SUPPLY_PROP_CURRENT_NOW,
 345         POWER_SUPPLY_PROP_CHARGE_TYPE,
 346         POWER_SUPPLY_PROP_STATUS,
 347 };
 348
 349 #define REQUEST_IRQ(_irq, _name)                                        \
 350 do {                                                                    \
 351         ret = request_threaded_irq(chip->irq_base + _irq, NULL,         \
 352                                     max8925_charger_handler,            \
 353                                     IRQF_ONESHOT, _name, info);         \
 354         if (ret)                                                        \
 355                 dev_err(chip->dev, "Failed to request IRQ #%d: %d\n",   \
 356                         _irq, ret);                                     \
 357 } while (0)
 358
 359 static __devinit int max8925_init_charger(struct max8925_chip *chip,
 360                                           struct max8925_power_info *info)
 361 {
 362         int ret;
 363
 364         REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
 365         if (!info->no_insert_detect) {
 366                 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
 367                 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
 368         }
 369         if (!info->no_temp_support) {
 370                 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
 371                 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
 372         }
 373         REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
 374         REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
 375         REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
 376         REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
 377         REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
 378         REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
 379
 380         info->usb_online = 0;
 381         info->bat_online = 0;
 382
 383         /* check for power - can miss interrupt at boot time */
 384         if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
 385                 info->ac_online = 1;
 386         else
 387                 info->ac_online = 0;
 388
 389         ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 390         if (ret >= 0) {
 391                 /*
 392                  * If battery detection is enabled, ID pin of battery is
 393                  * connected to MBDET pin of MAX8925. It could be used to
 394                  * detect battery presence.
 395                  * Otherwise, we have to assume that battery is always on.
 396                  */
 397                 if (info->batt_detect)
 398                         info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
 399                 else
 400                         info->bat_online = 1;
 401                 if (ret & MAX8925_CHG_AC_RANGE_MASK)
 402                         info->ac_online = 1;
 403                 else
 404                         info->ac_online = 0;
 405         }
 406         /* disable charge */
 407         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
 408         /* set charging current in charge topoff mode */
 409         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
 410                          info->topoff_threshold << 5);
 411         /* set charing current in fast charge mode */
 412         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
 413
 414         return 0;
 415 }
 416
 417 static __devexit int max8925_deinit_charger(struct max8925_power_info *info)
 418 {
 419         struct max8925_chip *chip = info->chip;
 420         int irq;
 421
 422         irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
 423         for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
 424                 free_irq(irq, info);
 425
 426         return 0;
 427 }
 428
 429 static __devinit int max8925_power_probe(struct platform_device *pdev)
 430 {
 431         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 432         struct max8925_power_pdata *pdata = NULL;
 433         struct max8925_power_info *info;
 434         int ret;
 435
 436         pdata = pdev->dev.platform_data;
 437         if (!pdata) {
 438                 dev_err(&pdev->dev, "platform data isn't assigned to "
 439                         "power supply\n");
 440                 return -EINVAL;
 441         }
 442
 443         info = kzalloc(sizeof(struct max8925_power_info), GFP_KERNEL);
 444         if (!info)
 445                 return -ENOMEM;
 446         info->chip = chip;
 447         info->gpm = chip->i2c;
 448         info->adc = chip->adc;
 449         platform_set_drvdata(pdev, info);
 450
 451         info->ac.name = "max8925-ac";
 452         info->ac.type = POWER_SUPPLY_TYPE_MAINS;
 453         info->ac.properties = max8925_ac_props;
 454         info->ac.num_properties = ARRAY_SIZE(max8925_ac_props);
 455         info->ac.get_property = max8925_ac_get_prop;
 456         info->ac.supplied_to = pdata->supplied_to;
 457         info->ac.num_supplicants = pdata->num_supplicants;
 458         ret = power_supply_register(&pdev->dev, &info->ac);
 459         if (ret)
 460                 goto out;
 461         info->ac.dev->parent = &pdev->dev;
 462
 463         info->usb.name = "max8925-usb";
 464         info->usb.type = POWER_SUPPLY_TYPE_USB;
 465         info->usb.properties = max8925_usb_props;
 466         info->usb.num_properties = ARRAY_SIZE(max8925_usb_props);
 467         info->usb.get_property = max8925_usb_get_prop;
 468         info->usb.supplied_to = pdata->supplied_to;
 469         info->usb.num_supplicants = pdata->num_supplicants;
 470
 471         ret = power_supply_register(&pdev->dev, &info->usb);
 472         if (ret)
 473                 goto out_usb;
 474         info->usb.dev->parent = &pdev->dev;
 475
 476         info->battery.name = "max8925-battery";
 477         info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 478         info->battery.properties = max8925_battery_props;
 479         info->battery.num_properties = ARRAY_SIZE(max8925_battery_props);
 480         info->battery.get_property = max8925_bat_get_prop;
 481         ret = power_supply_register(&pdev->dev, &info->battery);
 482         if (ret)
 483                 goto out_battery;
 484         info->battery.dev->parent = &pdev->dev;
 485
 486         info->batt_detect = pdata->batt_detect;
 487         info->topoff_threshold = pdata->topoff_threshold;
 488         info->fast_charge = pdata->fast_charge;
 489         info->set_charger = pdata->set_charger;
 490         info->no_temp_support = pdata->no_temp_support;
 491         info->no_insert_detect = pdata->no_insert_detect;
 492
 493         max8925_init_charger(chip, info);
 494         return 0;
 495 out_battery:
 496         power_supply_unregister(&info->battery);
 497 out_usb:
 498         power_supply_unregister(&info->ac);
 499 out:
 500         kfree(info);
 501         return ret;
 502 }
 503
 504 static __devexit int max8925_power_remove(struct platform_device *pdev)
 505 {
 506         struct max8925_power_info *info = platform_get_drvdata(pdev);
 507
 508         if (info) {
 509                 power_supply_unregister(&info->ac);
 510                 power_supply_unregister(&info->usb);
 511                 power_supply_unregister(&info->battery);
 512                 max8925_deinit_charger(info);
 513                 kfree(info);
 514         }
 515         return 0;
 516 }
 517
 518 static struct platform_driver max8925_power_driver = {
 519         .probe  = max8925_power_probe,
 520         .remove = __devexit_p(max8925_power_remove),
 521         .driver = {
 522                 .name   = "max8925-power",
 523         },
 524 };
 525
 526 module_platform_driver(max8925_power_driver);
 527
 528 MODULE_LICENSE("GPL");
 529 MODULE_DESCRIPTION("Power supply driver for MAX8925");
 530 MODULE_ALIAS("platform:max8925-power");