drivers/power/wm8350_power.c

   1 /*
   2  * Battery driver for wm8350 PMIC
   3  *
   4  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   5  *
   6  * Based on OLPC Battery Driver
   7  *
   8  * Copyright 2006  David Woodhouse <dwmw2@infradead.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/err.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/power_supply.h>
  19 #include <linux/mfd/wm8350/supply.h>
  20 #include <linux/mfd/wm8350/core.h>
  21 #include <linux/mfd/wm8350/comparator.h>
  22
  23 static int wm8350_read_battery_uvolts(struct wm8350 *wm8350)
  24 {
  25         return wm8350_read_auxadc(wm8350, WM8350_AUXADC_BATT, 0, 0)
  26                 * WM8350_AUX_COEFF;
  27 }
  28
  29 static int wm8350_read_line_uvolts(struct wm8350 *wm8350)
  30 {
  31         return wm8350_read_auxadc(wm8350, WM8350_AUXADC_LINE, 0, 0)
  32                 * WM8350_AUX_COEFF;
  33 }
  34
  35 static int wm8350_read_usb_uvolts(struct wm8350 *wm8350)
  36 {
  37         return wm8350_read_auxadc(wm8350, WM8350_AUXADC_USB, 0, 0)
  38                 * WM8350_AUX_COEFF;
  39 }
  40
  41 #define WM8350_BATT_SUPPLY      1
  42 #define WM8350_USB_SUPPLY       2
  43 #define WM8350_LINE_SUPPLY      4
  44
  45 static inline int wm8350_charge_time_min(struct wm8350 *wm8350, int min)
  46 {
  47         if (!wm8350->power.rev_g_coeff)
  48                 return (((min - 30) / 15) & 0xf) << 8;
  49         else
  50                 return (((min - 30) / 30) & 0xf) << 8;
  51 }
  52
  53 static int wm8350_get_supplies(struct wm8350 *wm8350)
  54 {
  55         u16 sm, ov, co, chrg;
  56         int supplies = 0;
  57
  58         sm = wm8350_reg_read(wm8350, WM8350_STATE_MACHINE_STATUS);
  59         ov = wm8350_reg_read(wm8350, WM8350_MISC_OVERRIDES);
  60         co = wm8350_reg_read(wm8350, WM8350_COMPARATOR_OVERRIDES);
  61         chrg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
  62
  63         /* USB_SM */
  64         sm = (sm & WM8350_USB_SM_MASK) >> WM8350_USB_SM_SHIFT;
  65
  66         /* CHG_ISEL */
  67         chrg &= WM8350_CHG_ISEL_MASK;
  68
  69         /* If the USB state machine is active then we're using that with or
  70          * without battery, otherwise check for wall supply */
  71         if (((sm == WM8350_USB_SM_100_SLV) ||
  72              (sm == WM8350_USB_SM_500_SLV) ||
  73              (sm == WM8350_USB_SM_STDBY_SLV))
  74             && !(ov & WM8350_USB_LIMIT_OVRDE))
  75                 supplies = WM8350_USB_SUPPLY;
  76         else if (((sm == WM8350_USB_SM_100_SLV) ||
  77                   (sm == WM8350_USB_SM_500_SLV) ||
  78                   (sm == WM8350_USB_SM_STDBY_SLV))
  79                  && (ov & WM8350_USB_LIMIT_OVRDE) && (chrg == 0))
  80                 supplies = WM8350_USB_SUPPLY | WM8350_BATT_SUPPLY;
  81         else if (co & WM8350_WALL_FB_OVRDE)
  82                 supplies = WM8350_LINE_SUPPLY;
  83         else
  84                 supplies = WM8350_BATT_SUPPLY;
  85
  86         return supplies;
  87 }
  88
  89 static int wm8350_charger_config(struct wm8350 *wm8350,
  90                                  struct wm8350_charger_policy *policy)
  91 {
  92         u16 reg, eoc_mA, fast_limit_mA;
  93
  94         if (!policy) {
  95                 dev_warn(wm8350->dev,
  96                          "No charger policy, charger not configured.\n");
  97                 return -EINVAL;
  98         }
  99
 100         /* make sure USB fast charge current is not > 500mA */
 101         if (policy->fast_limit_USB_mA > 500) {
 102                 dev_err(wm8350->dev, "USB fast charge > 500mA\n");
 103                 return -EINVAL;
 104         }
 105
 106         eoc_mA = WM8350_CHG_EOC_mA(policy->eoc_mA);
 107
 108         wm8350_reg_unlock(wm8350);
 109
 110         reg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1)
 111                 & WM8350_CHG_ENA_R168;
 112         wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
 113                          reg | eoc_mA | policy->trickle_start_mV |
 114                          WM8350_CHG_TRICKLE_TEMP_CHOKE |
 115                          WM8350_CHG_TRICKLE_USB_CHOKE |
 116                          WM8350_CHG_FAST_USB_THROTTLE);
 117
 118         if (wm8350_get_supplies(wm8350) & WM8350_USB_SUPPLY) {
 119                 fast_limit_mA =
 120                         WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_USB_mA);
 121                 wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
 122                             policy->charge_mV | policy->trickle_charge_USB_mA |
 123                             fast_limit_mA | wm8350_charge_time_min(wm8350,
 124                                                 policy->charge_timeout));
 125
 126         } else {
 127                 fast_limit_mA =
 128                         WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_mA);
 129                 wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
 130                             policy->charge_mV | policy->trickle_charge_mA |
 131                             fast_limit_mA | wm8350_charge_time_min(wm8350,
 132                                                 policy->charge_timeout));
 133         }
 134
 135         wm8350_reg_lock(wm8350);
 136         return 0;
 137 }
 138
 139 static int wm8350_batt_status(struct wm8350 *wm8350)
 140 {
 141         u16 state;
 142
 143         state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
 144         state &= WM8350_CHG_STS_MASK;
 145
 146         switch (state) {
 147         case WM8350_CHG_STS_OFF:
 148                 return POWER_SUPPLY_STATUS_DISCHARGING;
 149
 150         case WM8350_CHG_STS_TRICKLE:
 151         case WM8350_CHG_STS_FAST:
 152                 return POWER_SUPPLY_STATUS_CHARGING;
 153
 154         default:
 155                 return POWER_SUPPLY_STATUS_UNKNOWN;
 156         }
 157 }
 158
 159 static ssize_t charger_state_show(struct device *dev,
 160                                  struct device_attribute *attr, char *buf)
 161 {
 162         struct wm8350 *wm8350 = dev_get_drvdata(dev);
 163         char *charge;
 164         int state;
 165
 166         state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
 167             WM8350_CHG_STS_MASK;
 168         switch (state) {
 169         case WM8350_CHG_STS_OFF:
 170                 charge = "Charger Off";
 171                 break;
 172         case WM8350_CHG_STS_TRICKLE:
 173                 charge = "Trickle Charging";
 174                 break;
 175         case WM8350_CHG_STS_FAST:
 176                 charge = "Fast Charging";
 177                 break;
 178         default:
 179                 return 0;
 180         }
 181
 182         return sprintf(buf, "%s\n", charge);
 183 }
 184
 185 static DEVICE_ATTR(charger_state, 0444, charger_state_show, NULL);
 186
 187 static void wm8350_charger_handler(struct wm8350 *wm8350, int irq, void *data)
 188 {
 189         struct wm8350_power *power = &wm8350->power;
 190         struct wm8350_charger_policy *policy = power->policy;
 191
 192         switch (irq) {
 193         case WM8350_IRQ_CHG_BAT_HOT:
 194                 dev_err(wm8350->dev, "battery too hot\n");
 195                 break;
 196         case WM8350_IRQ_CHG_BAT_COLD:
 197                 dev_err(wm8350->dev, "battery too cold\n");
 198                 break;
 199         case WM8350_IRQ_CHG_BAT_FAIL:
 200                 dev_err(wm8350->dev, "battery failed\n");
 201                 break;
 202         case WM8350_IRQ_CHG_TO:
 203                 dev_err(wm8350->dev, "charger timeout\n");
 204                 break;
 205         case WM8350_IRQ_CHG_END:
 206                 power_supply_changed(&power->battery);
 207                 break;
 208         case WM8350_IRQ_CHG_START:
 209                 power_supply_changed(&power->battery);
 210                 break;
 211
 212         case WM8350_IRQ_CHG_FAST_RDY:
 213                 dev_dbg(wm8350->dev, "fast charger ready\n");
 214                 wm8350_charger_config(wm8350, policy);
 215                 wm8350_reg_unlock(wm8350);
 216                 wm8350_set_bits(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
 217                                 WM8350_CHG_FAST);
 218                 wm8350_reg_lock(wm8350);
 219                 break;
 220
 221         case WM8350_IRQ_CHG_VBATT_LT_3P9:
 222                 dev_warn(wm8350->dev, "battery < 3.9V\n");
 223                 break;
 224         case WM8350_IRQ_CHG_VBATT_LT_3P1:
 225                 dev_warn(wm8350->dev, "battery < 3.1V\n");
 226                 break;
 227         case WM8350_IRQ_CHG_VBATT_LT_2P85:
 228                 dev_warn(wm8350->dev, "battery < 2.85V\n");
 229                 break;
 230
 231                 /* Supply change.  We will overnotify but it should do
 232                  * no harm. */
 233         case WM8350_IRQ_EXT_USB_FB:
 234         case WM8350_IRQ_EXT_WALL_FB:
 235                 wm8350_charger_config(wm8350, policy);
 236         case WM8350_IRQ_EXT_BAT_FB:   /* Fall through */
 237                 power_supply_changed(&power->battery);
 238                 power_supply_changed(&power->usb);
 239                 power_supply_changed(&power->ac);
 240                 break;
 241
 242         default:
 243                 dev_err(wm8350->dev, "Unknown interrupt %d\n", irq);
 244         }
 245 }
 246
 247 /*********************************************************************
 248  *              AC Power
 249  *********************************************************************/
 250 static int wm8350_ac_get_prop(struct power_supply *psy,
 251                               enum power_supply_property psp,
 252                               union power_supply_propval *val)
 253 {
 254         struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
 255         int ret = 0;
 256
 257         switch (psp) {
 258         case POWER_SUPPLY_PROP_ONLINE:
 259                 val->intval = !!(wm8350_get_supplies(wm8350) &
 260                                  WM8350_LINE_SUPPLY);
 261                 break;
 262         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 263                 val->intval = wm8350_read_line_uvolts(wm8350);
 264                 break;
 265         default:
 266                 ret = -EINVAL;
 267                 break;
 268         }
 269         return ret;
 270 }
 271
 272 static enum power_supply_property wm8350_ac_props[] = {
 273         POWER_SUPPLY_PROP_ONLINE,
 274         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 275 };
 276
 277 /*********************************************************************
 278  *              USB Power
 279  *********************************************************************/
 280 static int wm8350_usb_get_prop(struct power_supply *psy,
 281                                enum power_supply_property psp,
 282                                union power_supply_propval *val)
 283 {
 284         struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
 285         int ret = 0;
 286
 287         switch (psp) {
 288         case POWER_SUPPLY_PROP_ONLINE:
 289                 val->intval = !!(wm8350_get_supplies(wm8350) &
 290                                  WM8350_USB_SUPPLY);
 291                 break;
 292         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 293                 val->intval = wm8350_read_usb_uvolts(wm8350);
 294                 break;
 295         default:
 296                 ret = -EINVAL;
 297                 break;
 298         }
 299         return ret;
 300 }
 301
 302 static enum power_supply_property wm8350_usb_props[] = {
 303         POWER_SUPPLY_PROP_ONLINE,
 304         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 305 };
 306
 307 /*********************************************************************
 308  *              Battery properties
 309  *********************************************************************/
 310
 311 static int wm8350_bat_get_property(struct power_supply *psy,
 312                                    enum power_supply_property psp,
 313                                    union power_supply_propval *val)
 314 {
 315         struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
 316         int ret = 0;
 317
 318         switch (psp) {
 319         case POWER_SUPPLY_PROP_STATUS:
 320                 val->intval = wm8350_batt_status(wm8350);
 321                 break;
 322         case POWER_SUPPLY_PROP_ONLINE:
 323                 val->intval = !!(wm8350_get_supplies(wm8350) &
 324                                  WM8350_BATT_SUPPLY);
 325                 break;
 326         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 327                 val->intval = wm8350_read_battery_uvolts(wm8350);
 328                 break;
 329         default:
 330                 ret = -EINVAL;
 331                 break;
 332         }
 333
 334         return ret;
 335 }
 336
 337 static enum power_supply_property wm8350_bat_props[] = {
 338         POWER_SUPPLY_PROP_STATUS,
 339         POWER_SUPPLY_PROP_ONLINE,
 340         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 341 };
 342
 343 /*********************************************************************
 344  *              Initialisation
 345  *********************************************************************/
 346
 347 static void wm8350_init_charger(struct wm8350 *wm8350)
 348 {
 349         /* register our interest in charger events */
 350         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT,
 351                             wm8350_charger_handler, NULL);
 352         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
 353         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
 354                             wm8350_charger_handler, NULL);
 355         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
 356         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
 357                             wm8350_charger_handler, NULL);
 358         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
 359         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
 360                             wm8350_charger_handler, NULL);
 361         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_TO);
 362         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
 363                             wm8350_charger_handler, NULL);
 364         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_END);
 365         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
 366                             wm8350_charger_handler, NULL);
 367         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_START);
 368         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
 369                             wm8350_charger_handler, NULL);
 370         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY);
 371         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
 372                             wm8350_charger_handler, NULL);
 373         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
 374         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
 375                             wm8350_charger_handler, NULL);
 376         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
 377         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
 378                             wm8350_charger_handler, NULL);
 379         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
 380
 381         /* and supply change events */
 382         wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
 383                             wm8350_charger_handler, NULL);
 384         wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
 385         wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
 386                             wm8350_charger_handler, NULL);
 387         wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
 388         wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB,
 389                             wm8350_charger_handler, NULL);
 390         wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
 391 }
 392
 393 static void free_charger_irq(struct wm8350 *wm8350)
 394 {
 395         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
 396         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
 397         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
 398         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
 399         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
 400         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
 401         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_TO);
 402         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO);
 403         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_END);
 404         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END);
 405         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_START);
 406         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START);
 407         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
 408         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
 409         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
 410         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
 411         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
 412         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
 413         wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
 414         wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
 415         wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
 416         wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
 417         wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
 418         wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
 419 }
 420
 421 static __devinit int wm8350_power_probe(struct platform_device *pdev)
 422 {
 423         struct wm8350 *wm8350 = platform_get_drvdata(pdev);
 424         struct wm8350_power *power = &wm8350->power;
 425         struct wm8350_charger_policy *policy = power->policy;
 426         struct power_supply *usb = &power->usb;
 427         struct power_supply *battery = &power->battery;
 428         struct power_supply *ac = &power->ac;
 429         int ret;
 430
 431         ac->name = "wm8350-ac";
 432         ac->type = POWER_SUPPLY_TYPE_MAINS;
 433         ac->properties = wm8350_ac_props;
 434         ac->num_properties = ARRAY_SIZE(wm8350_ac_props);
 435         ac->get_property = wm8350_ac_get_prop;
 436         ret = power_supply_register(&pdev->dev, ac);
 437         if (ret)
 438                 return ret;
 439
 440         battery->name = "wm8350-battery";
 441         battery->properties = wm8350_bat_props;
 442         battery->num_properties = ARRAY_SIZE(wm8350_bat_props);
 443         battery->get_property = wm8350_bat_get_property;
 444         battery->use_for_apm = 1;
 445         ret = power_supply_register(&pdev->dev, battery);
 446         if (ret)
 447                 goto battery_failed;
 448
 449         usb->name = "wm8350-usb",
 450         usb->type = POWER_SUPPLY_TYPE_USB;
 451         usb->properties = wm8350_usb_props;
 452         usb->num_properties = ARRAY_SIZE(wm8350_usb_props);
 453         usb->get_property = wm8350_usb_get_prop;
 454         ret = power_supply_register(&pdev->dev, usb);
 455         if (ret)
 456                 goto usb_failed;
 457
 458         ret = device_create_file(&pdev->dev, &dev_attr_charger_state);
 459         if (ret < 0)
 460                 dev_warn(wm8350->dev, "failed to add charge sysfs: %d\n", ret);
 461         ret = 0;
 462
 463         wm8350_init_charger(wm8350);
 464         if (wm8350_charger_config(wm8350, policy) == 0) {
 465                 wm8350_reg_unlock(wm8350);
 466                 wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5, WM8350_CHG_ENA);
 467                 wm8350_reg_lock(wm8350);
 468         }
 469
 470         return ret;
 471
 472 usb_failed:
 473         power_supply_unregister(battery);
 474 battery_failed:
 475         power_supply_unregister(ac);
 476
 477         return ret;
 478 }
 479
 480 static __devexit int wm8350_power_remove(struct platform_device *pdev)
 481 {
 482         struct wm8350 *wm8350 = platform_get_drvdata(pdev);
 483         struct wm8350_power *power = &wm8350->power;
 484
 485         free_charger_irq(wm8350);
 486         device_remove_file(&pdev->dev, &dev_attr_charger_state);
 487         power_supply_unregister(&power->battery);
 488         power_supply_unregister(&power->ac);
 489         power_supply_unregister(&power->usb);
 490         return 0;
 491 }
 492
 493 static struct platform_driver wm8350_power_driver = {
 494         .probe = wm8350_power_probe,
 495         .remove = __devexit_p(wm8350_power_remove),
 496         .driver = {
 497                 .name = "wm8350-power",
 498         },
 499 };
 500
 501 static int __init wm8350_power_init(void)
 502 {
 503         return platform_driver_register(&wm8350_power_driver);
 504 }
 505 module_init(wm8350_power_init);
 506
 507 static void __exit wm8350_power_exit(void)
 508 {
 509         platform_driver_unregister(&wm8350_power_driver);
 510 }
 511 module_exit(wm8350_power_exit);
 512
 513 MODULE_LICENSE("GPL");
 514 MODULE_DESCRIPTION("Power supply driver for WM8350");
 515 MODULE_ALIAS("platform:wm8350-power");