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