drivers/power/supply/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/of.h>
  16 #include <linux/i2c.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/power_supply.h>
  20 #include <linux/mfd/max8925.h>
  21
  22 /* registers in GPM */
  23 #define MAX8925_OUT5VEN                 0x54
  24 #define MAX8925_OUT3VEN                 0x58
  25 #define MAX8925_CHG_CNTL1               0x7c
  26
  27 /* bits definition */
  28 #define MAX8925_CHG_STAT_VSYSLOW        (1 << 0)
  29 #define MAX8925_CHG_STAT_MODE_MASK      (3 << 2)
  30 #define MAX8925_CHG_STAT_EN_MASK        (1 << 4)
  31 #define MAX8925_CHG_MBDET               (1 << 1)
  32 #define MAX8925_CHG_AC_RANGE_MASK       (3 << 6)
  33
  34 /* registers in ADC */
  35 #define MAX8925_ADC_RES_CNFG1           0x06
  36 #define MAX8925_ADC_AVG_CNFG1           0x07
  37 #define MAX8925_ADC_ACQ_CNFG1           0x08
  38 #define MAX8925_ADC_ACQ_CNFG2           0x09
  39 /* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
  40 #define MAX8925_ADC_AUX2                0x62
  41 #define MAX8925_ADC_VCHG                0x64
  42 #define MAX8925_ADC_VBBATT              0x66
  43 #define MAX8925_ADC_VMBATT              0x68
  44 #define MAX8925_ADC_ISNS                0x6a
  45 #define MAX8925_ADC_THM                 0x6c
  46 #define MAX8925_ADC_TDIE                0x6e
  47 #define MAX8925_CMD_AUX2                0xc8
  48 #define MAX8925_CMD_VCHG                0xd0
  49 #define MAX8925_CMD_VBBATT              0xd8
  50 #define MAX8925_CMD_VMBATT              0xe0
  51 #define MAX8925_CMD_ISNS                0xe8
  52 #define MAX8925_CMD_THM                 0xf0
  53 #define MAX8925_CMD_TDIE                0xf8
  54
  55 enum {
  56         MEASURE_AUX2,
  57         MEASURE_VCHG,
  58         MEASURE_VBBATT,
  59         MEASURE_VMBATT,
  60         MEASURE_ISNS,
  61         MEASURE_THM,
  62         MEASURE_TDIE,
  63         MEASURE_MAX,
  64 };
  65
  66 struct max8925_power_info {
  67         struct max8925_chip     *chip;
  68         struct i2c_client       *gpm;
  69         struct i2c_client       *adc;
  70
  71         struct power_supply     *ac;
  72         struct power_supply     *usb;
  73         struct power_supply     *battery;
  74         int                     irq_base;
  75         unsigned                ac_online:1;
  76         unsigned                usb_online:1;
  77         unsigned                bat_online:1;
  78         unsigned                chg_mode:2;
  79         unsigned                batt_detect:1;  /* detecing MB by ID pin */
  80         unsigned                topoff_threshold:2;
  81         unsigned                fast_charge:3;
  82         unsigned                no_temp_support:1;
  83         unsigned                no_insert_detect:1;
  84
  85         int (*set_charger) (int);
  86 };
  87
  88 static int __set_charger(struct max8925_power_info *info, int enable)
  89 {
  90         struct max8925_chip *chip = info->chip;
  91         if (enable) {
  92                 /* enable charger in platform */
  93                 if (info->set_charger)
  94                         info->set_charger(1);
  95                 /* enable charger */
  96                 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
  97         } else {
  98                 /* disable charge */
  99                 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
 100                 if (info->set_charger)
 101                         info->set_charger(0);
 102         }
 103         dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
 104                 : "Disable charger");
 105         return 0;
 106 }
 107
 108 static irqreturn_t max8925_charger_handler(int irq, void *data)
 109 {
 110         struct max8925_power_info *info = (struct max8925_power_info *)data;
 111         struct max8925_chip *chip = info->chip;
 112
 113         switch (irq - chip->irq_base) {
 114         case MAX8925_IRQ_VCHG_DC_R:
 115                 info->ac_online = 1;
 116                 __set_charger(info, 1);
 117                 dev_dbg(chip->dev, "Adapter inserted\n");
 118                 break;
 119         case MAX8925_IRQ_VCHG_DC_F:
 120                 info->ac_online = 0;
 121                 __set_charger(info, 0);
 122                 dev_dbg(chip->dev, "Adapter removed\n");
 123                 break;
 124         case MAX8925_IRQ_VCHG_THM_OK_F:
 125                 /* Battery is not ready yet */
 126                 dev_dbg(chip->dev, "Battery temperature is out of range\n");
 127                 /* Fall through */
 128         case MAX8925_IRQ_VCHG_DC_OVP:
 129                 dev_dbg(chip->dev, "Error detection\n");
 130                 __set_charger(info, 0);
 131                 break;
 132         case MAX8925_IRQ_VCHG_THM_OK_R:
 133                 /* Battery is ready now */
 134                 dev_dbg(chip->dev, "Battery temperature is in range\n");
 135                 break;
 136         case MAX8925_IRQ_VCHG_SYSLOW_R:
 137                 /* VSYS is low */
 138                 dev_info(chip->dev, "Sys power is too low\n");
 139                 break;
 140         case MAX8925_IRQ_VCHG_SYSLOW_F:
 141                 dev_dbg(chip->dev, "Sys power is above low threshold\n");
 142                 break;
 143         case MAX8925_IRQ_VCHG_DONE:
 144                 __set_charger(info, 0);
 145                 dev_dbg(chip->dev, "Charging is done\n");
 146                 break;
 147         case MAX8925_IRQ_VCHG_TOPOFF:
 148                 dev_dbg(chip->dev, "Charging in top-off mode\n");
 149                 break;
 150         case MAX8925_IRQ_VCHG_TMR_FAULT:
 151                 __set_charger(info, 0);
 152                 dev_dbg(chip->dev, "Safe timer is expired\n");
 153                 break;
 154         case MAX8925_IRQ_VCHG_RST:
 155                 __set_charger(info, 0);
 156                 dev_dbg(chip->dev, "Charger is reset\n");
 157                 break;
 158         }
 159         return IRQ_HANDLED;
 160 }
 161
 162 static int start_measure(struct max8925_power_info *info, int type)
 163 {
 164         unsigned char buf[2] = {0, 0};
 165         int meas_cmd;
 166         int meas_reg = 0, ret;
 167
 168         switch (type) {
 169         case MEASURE_VCHG:
 170                 meas_cmd = MAX8925_CMD_VCHG;
 171                 meas_reg = MAX8925_ADC_VCHG;
 172                 break;
 173         case MEASURE_VBBATT:
 174                 meas_cmd = MAX8925_CMD_VBBATT;
 175                 meas_reg = MAX8925_ADC_VBBATT;
 176                 break;
 177         case MEASURE_VMBATT:
 178                 meas_cmd = MAX8925_CMD_VMBATT;
 179                 meas_reg = MAX8925_ADC_VMBATT;
 180                 break;
 181         case MEASURE_ISNS:
 182                 meas_cmd = MAX8925_CMD_ISNS;
 183                 meas_reg = MAX8925_ADC_ISNS;
 184                 break;
 185         default:
 186                 return -EINVAL;
 187         }
 188
 189         max8925_reg_write(info->adc, meas_cmd, 0);
 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 static const struct power_supply_desc ac_desc = {
 352         .name           = "max8925-ac",
 353         .type           = POWER_SUPPLY_TYPE_MAINS,
 354         .properties     = max8925_ac_props,
 355         .num_properties = ARRAY_SIZE(max8925_ac_props),
 356         .get_property   = max8925_ac_get_prop,
 357 };
 358
 359 static const struct power_supply_desc usb_desc = {
 360         .name           = "max8925-usb",
 361         .type           = POWER_SUPPLY_TYPE_USB,
 362         .properties     = max8925_usb_props,
 363         .num_properties = ARRAY_SIZE(max8925_usb_props),
 364         .get_property   = max8925_usb_get_prop,
 365 };
 366
 367 static const struct power_supply_desc battery_desc = {
 368         .name           = "max8925-battery",
 369         .type           = POWER_SUPPLY_TYPE_BATTERY,
 370         .properties     = max8925_battery_props,
 371         .num_properties = ARRAY_SIZE(max8925_battery_props),
 372         .get_property   = max8925_bat_get_prop,
 373 };
 374
 375 #define REQUEST_IRQ(_irq, _name)                                        \
 376 do {                                                                    \
 377         ret = request_threaded_irq(chip->irq_base + _irq, NULL,         \
 378                                     max8925_charger_handler,            \
 379                                     IRQF_ONESHOT, _name, info);         \
 380         if (ret)                                                        \
 381                 dev_err(chip->dev, "Failed to request IRQ #%d: %d\n",   \
 382                         _irq, ret);                                     \
 383 } while (0)
 384
 385 static int max8925_init_charger(struct max8925_chip *chip,
 386                                           struct max8925_power_info *info)
 387 {
 388         int ret;
 389
 390         REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
 391         if (!info->no_insert_detect) {
 392                 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
 393                 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
 394         }
 395         if (!info->no_temp_support) {
 396                 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
 397                 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
 398         }
 399         REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
 400         REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
 401         REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
 402         REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
 403         REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
 404         REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
 405
 406         info->usb_online = 0;
 407         info->bat_online = 0;
 408
 409         /* check for power - can miss interrupt at boot time */
 410         if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
 411                 info->ac_online = 1;
 412         else
 413                 info->ac_online = 0;
 414
 415         ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 416         if (ret >= 0) {
 417                 /*
 418                  * If battery detection is enabled, ID pin of battery is
 419                  * connected to MBDET pin of MAX8925. It could be used to
 420                  * detect battery presence.
 421                  * Otherwise, we have to assume that battery is always on.
 422                  */
 423                 if (info->batt_detect)
 424                         info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
 425                 else
 426                         info->bat_online = 1;
 427                 if (ret & MAX8925_CHG_AC_RANGE_MASK)
 428                         info->ac_online = 1;
 429                 else
 430                         info->ac_online = 0;
 431         }
 432         /* disable charge */
 433         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
 434         /* set charging current in charge topoff mode */
 435         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
 436                          info->topoff_threshold << 5);
 437         /* set charing current in fast charge mode */
 438         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
 439
 440         return 0;
 441 }
 442
 443 static int max8925_deinit_charger(struct max8925_power_info *info)
 444 {
 445         struct max8925_chip *chip = info->chip;
 446         int irq;
 447
 448         irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
 449         for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
 450                 free_irq(irq, info);
 451
 452         return 0;
 453 }
 454
 455 #ifdef CONFIG_OF
 456 static struct max8925_power_pdata *
 457 max8925_power_dt_init(struct platform_device *pdev)
 458 {
 459         struct device_node *nproot = pdev->dev.parent->of_node;
 460         struct device_node *np;
 461         int batt_detect;
 462         int topoff_threshold;
 463         int fast_charge;
 464         int no_temp_support;
 465         int no_insert_detect;
 466         struct max8925_power_pdata *pdata;
 467
 468         if (!nproot)
 469                 return pdev->dev.platform_data;
 470
 471         np = of_get_child_by_name(nproot, "charger");
 472         if (!np) {
 473                 dev_err(&pdev->dev, "failed to find charger node\n");
 474                 return NULL;
 475         }
 476
 477         pdata = devm_kzalloc(&pdev->dev,
 478                         sizeof(struct max8925_power_pdata),
 479                         GFP_KERNEL);
 480         if (!pdata)
 481                 goto ret;
 482
 483         of_property_read_u32(np, "topoff-threshold", &topoff_threshold);
 484         of_property_read_u32(np, "batt-detect", &batt_detect);
 485         of_property_read_u32(np, "fast-charge", &fast_charge);
 486         of_property_read_u32(np, "no-insert-detect", &no_insert_detect);
 487         of_property_read_u32(np, "no-temp-support", &no_temp_support);
 488
 489         pdata->batt_detect = batt_detect;
 490         pdata->fast_charge = fast_charge;
 491         pdata->topoff_threshold = topoff_threshold;
 492         pdata->no_insert_detect = no_insert_detect;
 493         pdata->no_temp_support = no_temp_support;
 494
 495 ret:
 496         of_node_put(np);
 497         return pdata;
 498 }
 499 #else
 500 static struct max8925_power_pdata *
 501 max8925_power_dt_init(struct platform_device *pdev)
 502 {
 503         return pdev->dev.platform_data;
 504 }
 505 #endif
 506
 507 static int max8925_power_probe(struct platform_device *pdev)
 508 {
 509         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 510         struct power_supply_config psy_cfg = {}; /* Only for ac and usb */
 511         struct max8925_power_pdata *pdata = NULL;
 512         struct max8925_power_info *info;
 513         int ret;
 514
 515         pdata = max8925_power_dt_init(pdev);
 516         if (!pdata) {
 517                 dev_err(&pdev->dev, "platform data isn't assigned to "
 518                         "power supply\n");
 519                 return -EINVAL;
 520         }
 521
 522         info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_power_info),
 523                                 GFP_KERNEL);
 524         if (!info)
 525                 return -ENOMEM;
 526         info->chip = chip;
 527         info->gpm = chip->i2c;
 528         info->adc = chip->adc;
 529         platform_set_drvdata(pdev, info);
 530
 531         psy_cfg.supplied_to = pdata->supplied_to;
 532         psy_cfg.num_supplicants = pdata->num_supplicants;
 533
 534         info->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
 535         if (IS_ERR(info->ac)) {
 536                 ret = PTR_ERR(info->ac);
 537                 goto out;
 538         }
 539         info->ac->dev.parent = &pdev->dev;
 540
 541         info->usb = power_supply_register(&pdev->dev, &usb_desc, &psy_cfg);
 542         if (IS_ERR(info->usb)) {
 543                 ret = PTR_ERR(info->usb);
 544                 goto out_unregister_ac;
 545         }
 546         info->usb->dev.parent = &pdev->dev;
 547
 548         info->battery = power_supply_register(&pdev->dev, &battery_desc, NULL);
 549         if (IS_ERR(info->battery)) {
 550                 ret = PTR_ERR(info->battery);
 551                 goto out_unregister_usb;
 552         }
 553         info->battery->dev.parent = &pdev->dev;
 554
 555         info->batt_detect = pdata->batt_detect;
 556         info->topoff_threshold = pdata->topoff_threshold;
 557         info->fast_charge = pdata->fast_charge;
 558         info->set_charger = pdata->set_charger;
 559         info->no_temp_support = pdata->no_temp_support;
 560         info->no_insert_detect = pdata->no_insert_detect;
 561
 562         max8925_init_charger(chip, info);
 563         return 0;
 564 out_unregister_usb:
 565         power_supply_unregister(info->usb);
 566 out_unregister_ac:
 567         power_supply_unregister(info->ac);
 568 out:
 569         return ret;
 570 }
 571
 572 static int max8925_power_remove(struct platform_device *pdev)
 573 {
 574         struct max8925_power_info *info = platform_get_drvdata(pdev);
 575
 576         if (info) {
 577                 power_supply_unregister(info->ac);
 578                 power_supply_unregister(info->usb);
 579                 power_supply_unregister(info->battery);
 580                 max8925_deinit_charger(info);
 581         }
 582         return 0;
 583 }
 584
 585 static struct platform_driver max8925_power_driver = {
 586         .probe  = max8925_power_probe,
 587         .remove = max8925_power_remove,
 588         .driver = {
 589                 .name   = "max8925-power",
 590         },
 591 };
 592
 593 module_platform_driver(max8925_power_driver);
 594
 595 MODULE_LICENSE("GPL");
 596 MODULE_DESCRIPTION("Power supply driver for MAX8925");
 597 MODULE_ALIAS("platform:max8925-power");