target/linux/omap24xx/patches-2.6.37/900-n810-battery-management.patch

   1 ---
   2  arch/arm/mach-omap2/board-n8x0.c |   13 +
   3  drivers/cbus/Kconfig             |   12 +
   4  drivers/cbus/Makefile            |    3
   5  drivers/cbus/lipocharge.c        |   63 ++++++
   6  drivers/cbus/lipocharge.h        |   50 ++++
   7  drivers/cbus/n810bm_main.c       |  397 +++++++++++++++++++++++++++++++++++++++
   8  drivers/cbus/retu.c              |    4
   9  drivers/cbus/retu.h              |    3
  10  drivers/cbus/tahvo.h             |    6
  11  9 files changed, 548 insertions(+), 3 deletions(-)
  12
  13 Index: linux-2.6.37/drivers/cbus/Kconfig
  14 ===================================================================
  15 --- linux-2.6.37.orig/drivers/cbus/Kconfig      2011-02-06 14:05:49.838388760 +0100
  16 +++ linux-2.6.37/drivers/cbus/Kconfig   2011-02-06 14:05:49.885395646 +0100
  17 @@ -94,4 +94,12 @@
  18           to Retu/Vilma. Detection state and events are exposed through
  19           sysfs.
  20
  21 +config N810BM
  22 +       depends on CBUS_RETU && CBUS_TAHVO
  23 +       tristate "Nokia n810 battery management"
  24 +       ---help---
  25 +         Nokia n810 device battery management.
  26 +
  27 +         If unsure, say N.
  28 +
  29  endmenu
  30 Index: linux-2.6.37/drivers/cbus/Makefile
  31 ===================================================================
  32 --- linux-2.6.37.orig/drivers/cbus/Makefile     2011-02-06 14:05:49.829387442 +0100
  33 +++ linux-2.6.37/drivers/cbus/Makefile  2011-02-06 14:05:49.885395646 +0100
  34 @@ -12,3 +12,6 @@
  35  obj-$(CONFIG_CBUS_TAHVO_USER)  += tahvo-user.o
  36  obj-$(CONFIG_CBUS_RETU_USER)   += retu-user.o
  37  obj-$(CONFIG_CBUS_RETU_HEADSET)        += retu-headset.o
  38 +n810bm-y                       += n810bm_main.o
  39 +n810bm-y                       += lipocharge.o
  40 +obj-$(CONFIG_N810BM)           += n810bm.o
  41 Index: linux-2.6.37/drivers/cbus/n810bm_main.c
  42 ===================================================================
  43 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  44 +++ linux-2.6.37/drivers/cbus/n810bm_main.c     2011-02-09 19:05:18.435536304 +0100
  45 @@ -0,0 +1,1168 @@
  46 +/*
  47 + *   Nokia n810 battery management
  48 + *
  49 + *   WARNING: This driver is based on unconfirmed documentation.
  50 + *            It is possibly dangerous to use this software.
  51 + *            Use this software at your own risk!
  52 + *
  53 + *   Copyright (c) 2010-2011 Michael Buesch <mb@bu3sch.de>
  54 + *
  55 + *   This program is free software; you can redistribute it and/or
  56 + *   modify it under the terms of the GNU General Public License
  57 + *   as published by the Free Software Foundation; either version 2
  58 + *   of the License, or (at your option) any later version.
  59 + *
  60 + *   This program is distributed in the hope that it will be useful,
  61 + *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  62 + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  63 + *   GNU General Public License for more details.
  64 + */
  65 +
  66 +#define DEBUG
  67 +
  68 +#include <linux/module.h>
  69 +#include <linux/device.h>
  70 +#include <linux/platform_device.h>
  71 +#include <linux/slab.h>
  72 +#include <linux/mutex.h>
  73 +#include <linux/timer.h>
  74 +#include <linux/firmware.h>
  75 +#include <linux/bitops.h>
  76 +#include <linux/workqueue.h>
  77 +#include <linux/delay.h>
  78 +
  79 +#include "cbus.h"
  80 +#include "retu.h"
  81 +#include "tahvo.h"
  82 +#include "lipocharge.h"
  83 +
  84 +
  85 +#define N810BM_PMM_BLOCK_FILENAME      "n810-cal-bme-pmm.fw"
  86 +#define N810BM_PMM_BLOCK_SIZE          0x600
  87 +
  88 +#define N810BM_CHECK_INTERVAL          (HZ * 2)
  89 +#define N810BM_MIN_VOLTAGE_THRES       3200 /* Absolute minimum voltage threshold */
  90 +
  91 +
  92 +/* RETU_ADC_BSI
  93 + * The battery size indicator ADC measures the resistance between
  94 + * the battery BSI pin and ground. This is used to detect the battery
  95 + * capacity, as the BSI resistor is related to capacity.
  96 + *
  97 + * Manually measured lookup table.
  98 + * Hard to measure, thus not very accurate.
  99 + *
 100 + * Resistance  |  ADC value
 101 + * ========================
 102 + * 120k        |  0x3AC
 103 + * 110k        |  0x37C
 104 + * 100k        |  0x351
 105 + *  90k        |  0x329
 106 + */
 107 +
 108 +/* RETU_ADC_BATTVOLT
 109 + * Manually measured lookup table.
 110 + * Hard to measure, thus not very accurate.
 111 + *
 112 + * Voltage  |  ADC value
 113 + * =====================
 114 + * 2.80V    |  0x037
 115 + * 2.90V    |  0x05E
 116 + * 3.00V    |  0x090
 117 + * 3.10V    |  0x0A4
 118 + * 3.20V    |  0x0CC
 119 + * 3.30V    |  0x0EF
 120 + * 3.40V    |  0x115
 121 + * 3.50V    |  0x136
 122 + * 3.60V    |  0x15C
 123 + * 3.70V    |  0x187
 124 + * 3.80V    |  0x1A5
 125 + * 3.90V    |  0x1C9
 126 + * 4.00V    |  0x1ED
 127 + * 4.10V    |  0x212
 128 + * 4.20V    |  0x236
 129 + */
 130 +
 131 +
 132 +enum n810bm_capacity {
 133 +       N810BM_CAP_UNKNOWN      = -1,
 134 +       N810BM_CAP_NONE         = 0,
 135 +       N810BM_CAP_1500MAH      = 1500, /* 1500 mAh battery */
 136 +};
 137 +
 138 +enum n810bm_notify_flags {
 139 +       N810BM_NOTIFY_battery_charging,
 140 +       N810BM_NOTIFY_charger_pwm,
 141 +};
 142 +
 143 +struct n810bm {
 144 +       bool battery_present;                   /* A battery is inserted */
 145 +       bool charger_present;                   /* The charger is connected */
 146 +       enum n810bm_capacity capacity;          /* The capacity of the inserted battery (if any) */
 147 +
 148 +       bool charger_enabled;                   /* Want to charge? */
 149 +       struct lipocharge charger;              /* Charger subsystem */
 150 +       unsigned int active_current_pwm;        /* Active value of TAHVO_REG_CHGCURR */
 151 +       int current_measure_enabled;            /* Current measure enable refcount */
 152 +
 153 +       struct platform_device *pdev;
 154 +       const struct firmware *pmm_block;       /* CAL PMM block */
 155 +
 156 +       bool verbose_charge_log;                /* Verbose charge logging */
 157 +
 158 +       unsigned long notify_flags;
 159 +       struct work_struct notify_work;
 160 +       struct work_struct currmeas_irq_work;
 161 +       struct delayed_work periodic_check_work;
 162 +
 163 +       bool initialized;                       /* The hardware was initialized */
 164 +       struct mutex mutex;
 165 +};
 166 +
 167 +static void n810bm_notify_battery_charging(struct n810bm *bm);
 168 +static void n810bm_notify_charger_pwm(struct n810bm *bm);
 169 +
 170 +
 171 +static inline struct n810bm * device_to_n810bm(struct device *dev)
 172 +{
 173 +       struct platform_device *pdev = to_platform_device(dev);
 174 +       struct n810bm *bm = platform_get_drvdata(pdev);
 175 +
 176 +       return bm;
 177 +}
 178 +
 179 +static inline bool n810bm_known_battery_present(struct n810bm *bm)
 180 +{
 181 +       return bm->battery_present &&
 182 +              bm->capacity != N810BM_CAP_UNKNOWN &&
 183 +              bm->capacity != N810BM_CAP_NONE;
 184 +}
 185 +
 186 +static NORET_TYPE void n810bm_emergency(struct n810bm *bm, const char *message) ATTRIB_NORET;
 187 +static void n810bm_emergency(struct n810bm *bm, const char *message)
 188 +{
 189 +       printk(KERN_EMERG "n810 battery management fatal fault: %s\n", message);
 190 +       cbus_emergency();
 191 +}
 192 +
 193 +static u16 tahvo_read(struct n810bm *bm, unsigned int reg)
 194 +{
 195 +       int ret;
 196 +       unsigned long flags;
 197 +
 198 +       spin_lock_irqsave(&tahvo_lock, flags);
 199 +       ret = tahvo_read_reg(reg);
 200 +       spin_unlock_irqrestore(&tahvo_lock, flags);
 201 +       if (ret < 0 || ret > 0xFFFF)
 202 +               n810bm_emergency(bm, "tahvo_read");
 203 +
 204 +       return ret;
 205 +}
 206 +
 207 +static void tahvo_maskset(struct n810bm *bm, unsigned int reg, u16 mask, u16 set)
 208 +{
 209 +       int ret;
 210 +       unsigned long flags;
 211 +       u16 value;
 212 +
 213 +       spin_lock_irqsave(&tahvo_lock, flags);
 214 +       if (~mask) {
 215 +               ret = tahvo_read_reg(reg);
 216 +               if (ret < 0 || ret > 0xFFFF)
 217 +                       goto fatal_unlock;
 218 +               value = ret;
 219 +       } else
 220 +               value = 0;
 221 +       value &= ~mask;
 222 +       value |= set;
 223 +       ret = tahvo_write_reg(reg, value);
 224 +       if (ret)
 225 +               goto fatal_unlock;
 226 +       spin_unlock_irqrestore(&tahvo_lock, flags);
 227 +
 228 +       return;
 229 +
 230 +fatal_unlock:
 231 +       spin_unlock_irqrestore(&tahvo_lock, flags);
 232 +       n810bm_emergency(bm, "tahvo_maskset");
 233 +}
 234 +
 235 +static inline void tahvo_write(struct n810bm *bm, unsigned int reg, u16 value)
 236 +{
 237 +       tahvo_maskset(bm, reg, 0xFFFF, value);
 238 +}
 239 +
 240 +static inline void tahvo_set(struct n810bm *bm, unsigned int reg, u16 mask)
 241 +{
 242 +       tahvo_maskset(bm, reg, mask, mask);
 243 +}
 244 +
 245 +static inline void tahvo_clear(struct n810bm *bm, unsigned int reg, u16 mask)
 246 +{
 247 +       tahvo_maskset(bm, reg, mask, 0);
 248 +}
 249 +
 250 +static u16 retu_read(struct n810bm *bm, unsigned int reg)
 251 +{
 252 +       int ret;
 253 +       unsigned long flags;
 254 +
 255 +       spin_lock_irqsave(&retu_lock, flags);
 256 +       ret = retu_read_reg(reg);
 257 +       spin_unlock_irqrestore(&retu_lock, flags);
 258 +       if (ret < 0 || ret > 0xFFFF)
 259 +               n810bm_emergency(bm, "retu_read");
 260 +
 261 +       return ret;
 262 +}
 263 +
 264 +static void retu_maskset(struct n810bm *bm, unsigned int reg, u16 mask, u16 set)
 265 +{
 266 +       int ret;
 267 +       unsigned long flags;
 268 +       u16 value;
 269 +
 270 +       spin_lock_irqsave(&retu_lock, flags);
 271 +       if (~mask) {
 272 +               ret = retu_read_reg(reg);
 273 +               if (ret < 0 || ret > 0xFFFF)
 274 +                       goto fatal_unlock;
 275 +               value = ret;
 276 +       } else
 277 +               value = 0;
 278 +       value &= ~mask;
 279 +       value |= set;
 280 +       ret = retu_write_reg(reg, value);
 281 +       if (ret)
 282 +               goto fatal_unlock;
 283 +       spin_unlock_irqrestore(&retu_lock, flags);
 284 +
 285 +       return;
 286 +
 287 +fatal_unlock:
 288 +       spin_unlock_irqrestore(&retu_lock, flags);
 289 +       n810bm_emergency(bm, "retu_maskset");
 290 +}
 291 +
 292 +static inline void retu_write(struct n810bm *bm, unsigned int reg, u16 value)
 293 +{
 294 +       retu_maskset(bm, reg, 0xFFFF, value);
 295 +}
 296 +
 297 +static int retu_adc_average(struct n810bm *bm, unsigned int chan,
 298 +                           unsigned int nr_passes)
 299 +{
 300 +       unsigned int i, value = 0;
 301 +       int ret;
 302 +
 303 +       if (WARN_ON(!nr_passes))
 304 +               return 0;
 305 +       for (i = 0; i < nr_passes; i++) {
 306 +               ret = retu_read_adc(chan);
 307 +               if (ret < 0)
 308 +                       return ret;
 309 +               value += ret;
 310 +       }
 311 +       value /= nr_passes;
 312 +
 313 +       return value;
 314 +}
 315 +
 316 +/* Set the current measure timer that triggers on Tahvo IRQ 7
 317 + * An interval of zero disables the timer. */
 318 +static void n810bm_set_current_measure_timer(struct n810bm *bm,
 319 +                                            u16 millisec_interval)
 320 +{
 321 +       u16 value = millisec_interval;
 322 +
 323 +       if (value <= 0xF905) {
 324 +               value = ((u64)0x10624DD3 * (u64)(value + 0xF9)) >> 32;
 325 +               value /= 16;
 326 +       } else
 327 +               value = 0xFF;
 328 +
 329 +       tahvo_write(bm, TAHVO_REG_BATCURRTIMER, value & 0xFF);
 330 +
 331 +       tahvo_set(bm, TAHVO_REG_CHGCTL,
 332 +                 TAHVO_REG_CHGCTL_CURTIMRST);
 333 +       tahvo_clear(bm, TAHVO_REG_CHGCTL,
 334 +                   TAHVO_REG_CHGCTL_CURTIMRST);
 335 +
 336 +       if (millisec_interval)
 337 +               tahvo_enable_irq(TAHVO_INT_BATCURR);
 338 +       else
 339 +               tahvo_disable_irq(TAHVO_INT_BATCURR);
 340 +
 341 +       //TODO also do a software timer for safety.
 342 +}
 343 +
 344 +static void n810bm_enable_current_measure(struct n810bm *bm)
 345 +{
 346 +       WARN_ON(bm->current_measure_enabled < 0);
 347 +       if (!bm->current_measure_enabled) {
 348 +               /* Enable the current measurement circuitry */
 349 +               tahvo_set(bm, TAHVO_REG_CHGCTL,
 350 +                         TAHVO_REG_CHGCTL_CURMEAS);
 351 +               dev_dbg(&bm->pdev->dev,
 352 +                       "Current measurement circuitry enabled");
 353 +       }
 354 +       bm->current_measure_enabled++;
 355 +}
 356 +
 357 +static void n810bm_disable_current_measure(struct n810bm *bm)
 358 +{
 359 +       bm->current_measure_enabled--;
 360 +       WARN_ON(bm->current_measure_enabled < 0);
 361 +       if (!bm->current_measure_enabled) {
 362 +               /* Disable the current measurement circuitry */
 363 +               tahvo_clear(bm, TAHVO_REG_CHGCTL,
 364 +                           TAHVO_REG_CHGCTL_CURMEAS);
 365 +               dev_dbg(&bm->pdev->dev,
 366 +                       "Current measurement circuitry disabled");
 367 +       }
 368 +}
 369 +
 370 +/* Measure the actual battery current. Returns a signed value in mA.
 371 + * Does only work, if current measurement was enabled. */
 372 +static int n810bm_measure_batt_current(struct n810bm *bm)
 373 +{
 374 +       u16 retval;
 375 +       int adc = 0, ma, i;
 376 +
 377 +       if (WARN_ON(bm->current_measure_enabled <= 0))
 378 +               return 0;
 379 +       for (i = 0; i < 3; i++) {
 380 +               retval = tahvo_read(bm, TAHVO_REG_BATCURR);
 381 +               adc += (s16)retval; /* Value is signed */
 382 +       }
 383 +       adc /= 3;
 384 +
 385 +       //TODO convert to mA
 386 +       ma = adc;
 387 +
 388 +       return ma;
 389 +}
 390 +
 391 +/* Requires bm->mutex locked */
 392 +static int n810bm_measure_batt_current_async(struct n810bm *bm)
 393 +{
 394 +       int ma;
 395 +       bool charging = lipocharge_is_charging(&bm->charger);
 396 +
 397 +       n810bm_enable_current_measure(bm);
 398 +       if (!charging)
 399 +               WARN_ON(bm->active_current_pwm != 0);
 400 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
 401 +                     TAHVO_REG_CHGCTL_EN |
 402 +                     TAHVO_REG_CHGCTL_PWMOVR |
 403 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
 404 +                     TAHVO_REG_CHGCTL_EN |
 405 +                     TAHVO_REG_CHGCTL_PWMOVR |
 406 +                     (charging ? 0 : TAHVO_REG_CHGCTL_PWMOVRZERO));
 407 +       ma = n810bm_measure_batt_current(bm);
 408 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
 409 +                     TAHVO_REG_CHGCTL_EN |
 410 +                     TAHVO_REG_CHGCTL_PWMOVR |
 411 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
 412 +                     (charging ? TAHVO_REG_CHGCTL_EN : 0));
 413 +       n810bm_disable_current_measure(bm);
 414 +
 415 +       return ma;
 416 +}
 417 +
 418 +static int adc_sanity_check(struct n810bm *bm, unsigned int channel)
 419 +{
 420 +       int value;
 421 +
 422 +       value = retu_read_adc(channel);
 423 +       if (value < 0) {
 424 +               dev_err(&bm->pdev->dev, "Failed to read GND ADC channel %u",
 425 +                       channel);
 426 +               return -EIO;
 427 +       }
 428 +       dev_dbg(&bm->pdev->dev,
 429 +               "GND ADC channel %u sanity check got value: %d",
 430 +               channel, value);
 431 +       if (value > 5) {
 432 +               n810bm_emergency(bm, "GND ADC sanity check failed");
 433 +               return -EIO;
 434 +       }
 435 +
 436 +       return 0;
 437 +}
 438 +
 439 +static int n810bm_check_adc_sanity(struct n810bm *bm)
 440 +{
 441 +       int err;
 442 +
 443 +       /* Discard one conversion */
 444 +       retu_write(bm, RETU_REG_ADCSCR, 0);
 445 +       retu_read_adc(RETU_ADC_GND2);
 446 +
 447 +       err = adc_sanity_check(bm, RETU_ADC_GND2);
 448 +       if (err)
 449 +               return err;
 450 +
 451 +       return 0;
 452 +}
 453 +
 454 +/* Measure the battery voltage. Returns the value in mV (or negative value on error). */
 455 +static int n810bm_measure_batt_voltage(struct n810bm *bm)
 456 +{
 457 +       int adc;
 458 +       unsigned int mv;
 459 +       const unsigned int scale = 1000;
 460 +
 461 +       adc = retu_adc_average(bm, RETU_ADC_BATTVOLT, 5);
 462 +       if (adc < 0)
 463 +               return adc;
 464 +       if (adc <= 0x37)
 465 +               return 2800;
 466 +       mv = 2800 + ((adc - 0x37) * (((4200 - 2800) * scale) / (0x236 - 0x37))) / scale;
 467 +
 468 +       //TODO compensate for power consumption
 469 +       //TODO honor calibration values
 470 +
 471 +       return mv;
 472 +}
 473 +
 474 +/* Measure the charger voltage. Returns the value in mV (or negative value on error). */
 475 +static int n810bm_measure_charger_voltage(struct n810bm *bm)
 476 +{
 477 +       int adc;
 478 +       unsigned int mv;
 479 +
 480 +       adc = retu_adc_average(bm, RETU_ADC_CHGVOLT, 5);
 481 +       if (adc < 0)
 482 +               return adc;
 483 +       //TODO convert to mV
 484 +       mv = adc;
 485 +
 486 +       return mv;
 487 +}
 488 +
 489 +/* Measure backup battery voltage. Returns the value in mV (or negative value on error). */
 490 +static int n810bm_measure_backup_batt_voltage(struct n810bm *bm)
 491 +{
 492 +       int adc;
 493 +       unsigned int mv;
 494 +
 495 +       adc = retu_adc_average(bm, RETU_ADC_BKUPVOLT, 3);
 496 +       if (adc < 0)
 497 +               return adc;
 498 +       //TODO convert to mV
 499 +       mv = adc;
 500 +
 501 +       return mv;
 502 +}
 503 +
 504 +/* Measure the battery temperature. Returns the value in K (or negative value on error). */
 505 +static int n810bm_measure_batt_temp(struct n810bm *bm)
 506 +{
 507 +       int adc;
 508 +       unsigned int k;
 509 +
 510 +       adc = retu_adc_average(bm, RETU_ADC_BATTEMP, 3);
 511 +       if (adc < 0)
 512 +               return adc;
 513 +       //TODO convert to K
 514 +       k = adc;
 515 +
 516 +       return k;
 517 +}
 518 +
 519 +/* Read the battery capacity via BSI pin. */
 520 +static enum n810bm_capacity n810bm_read_batt_capacity(struct n810bm *bm)
 521 +{
 522 +       int adc;
 523 +       const unsigned int hyst = 20;
 524 +
 525 +       adc = retu_adc_average(bm, RETU_ADC_BSI, 5);
 526 +       if (adc < 0) {
 527 +               dev_err(&bm->pdev->dev, "Failed to read BSI ADC");
 528 +               return N810BM_CAP_UNKNOWN;
 529 +       }
 530 +
 531 +       if (adc >= 0x3B5 - hyst && adc <= 0x3B5 + hyst)
 532 +               return N810BM_CAP_1500MAH;
 533 +
 534 +       dev_err(&bm->pdev->dev, "Capacity indicator 0x%X unknown", adc);
 535 +
 536 +       return N810BM_CAP_UNKNOWN;
 537 +}
 538 +
 539 +/* Convert a battery voltage (in mV) to percentage. */
 540 +static unsigned int n810bm_mvolt2percent(unsigned int mv)
 541 +{
 542 +       const unsigned int minv = 3700;
 543 +       const unsigned int maxv = 4150;
 544 +       unsigned int percent;
 545 +
 546 +       mv = clamp(mv, minv, maxv);
 547 +       percent = (mv - minv) * 100 / (maxv - minv);
 548 +
 549 +       return percent;
 550 +}
 551 +
 552 +static void n810bm_start_charge(struct n810bm *bm)
 553 +{
 554 +       int err;
 555 +
 556 +       WARN_ON(!bm->battery_present);
 557 +       WARN_ON(!bm->charger_present);
 558 +
 559 +       /* Set PWM to zero */
 560 +       bm->active_current_pwm = 0;
 561 +       tahvo_write(bm, TAHVO_REG_CHGCURR, bm->active_current_pwm);
 562 +
 563 +       /* Charge global enable */
 564 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
 565 +                     TAHVO_REG_CHGCTL_EN |
 566 +                     TAHVO_REG_CHGCTL_PWMOVR |
 567 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
 568 +                     TAHVO_REG_CHGCTL_EN);
 569 +
 570 +       WARN_ON((int)bm->capacity <= 0);
 571 +       bm->charger.capacity = bm->capacity;
 572 +       err = lipocharge_start(&bm->charger);
 573 +       WARN_ON(err);
 574 +
 575 +       /* Initialize current measurement circuitry */
 576 +       n810bm_enable_current_measure(bm);
 577 +       n810bm_set_current_measure_timer(bm, 250);
 578 +
 579 +       dev_info(&bm->pdev->dev, "Charging battery");
 580 +       n810bm_notify_charger_pwm(bm);
 581 +       n810bm_notify_battery_charging(bm);
 582 +}
 583 +
 584 +static void n810bm_stop_charge(struct n810bm *bm)
 585 +{
 586 +       if (lipocharge_is_charging(&bm->charger)) {
 587 +               n810bm_set_current_measure_timer(bm, 0);
 588 +               n810bm_disable_current_measure(bm);
 589 +       }
 590 +       lipocharge_stop(&bm->charger);
 591 +
 592 +       /* Set PWM to zero */
 593 +       bm->active_current_pwm = 0;
 594 +       tahvo_write(bm, TAHVO_REG_CHGCURR, bm->active_current_pwm);
 595 +
 596 +       /* Charge global disable */
 597 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
 598 +                     TAHVO_REG_CHGCTL_EN |
 599 +                     TAHVO_REG_CHGCTL_PWMOVR |
 600 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
 601 +                     0);
 602 +
 603 +       dev_info(&bm->pdev->dev, "Not charging battery");
 604 +       n810bm_notify_charger_pwm(bm);
 605 +       n810bm_notify_battery_charging(bm);
 606 +}
 607 +
 608 +/* Periodic check */
 609 +static void n810bm_periodic_check_work(struct work_struct *work)
 610 +{
 611 +       struct n810bm *bm = container_of(to_delayed_work(work),
 612 +                                        struct n810bm, periodic_check_work);
 613 +       u16 status;
 614 +       bool battery_was_present, charger_was_present;
 615 +       int mv;
 616 +
 617 +       mutex_lock(&bm->mutex);
 618 +
 619 +       status = retu_read(bm, RETU_REG_STATUS);
 620 +       battery_was_present = bm->battery_present;
 621 +       charger_was_present = bm->charger_present;
 622 +       bm->battery_present = !!(status & RETU_REG_STATUS_BATAVAIL);
 623 +       bm->charger_present = !!(status & RETU_REG_STATUS_CHGPLUG);
 624 +
 625 +       if (bm->battery_present != battery_was_present) {
 626 +               /* Battery state changed */
 627 +               if (bm->battery_present) {
 628 +                       bm->capacity = n810bm_read_batt_capacity(bm);
 629 +                       if (bm->capacity == N810BM_CAP_UNKNOWN) {
 630 +                               dev_err(&bm->pdev->dev, "Unknown battery detected");
 631 +                       } else {
 632 +                               dev_info(&bm->pdev->dev, "Detected %u mAh battery",
 633 +                                        (unsigned int)bm->capacity);
 634 +                       }
 635 +               } else {
 636 +                       bm->capacity = N810BM_CAP_NONE;
 637 +                       dev_info(&bm->pdev->dev, "The main battery was removed");
 638 +                       //TODO disable charging
 639 +               }
 640 +       }
 641 +
 642 +       if (bm->charger_present != charger_was_present) {
 643 +               /* Charger state changed */
 644 +               dev_info(&bm->pdev->dev, "The charger was %s",
 645 +                        bm->charger_present ? "plugged in" : "removed");
 646 +       }
 647 +
 648 +       if ((bm->battery_present && !bm->charger_present) ||
 649 +           !n810bm_known_battery_present(bm)){
 650 +               /* We're draining the battery */
 651 +               mv = n810bm_measure_batt_voltage(bm);
 652 +               if (mv < 0) {
 653 +                       n810bm_emergency(bm,
 654 +                               "check: Failed to measure voltage");
 655 +               }
 656 +               if (mv < N810BM_MIN_VOLTAGE_THRES) {
 657 +                       n810bm_emergency(bm,
 658 +                               "check: Minimum voltage threshold reached");
 659 +               }
 660 +       }
 661 +
 662 +       if (bm->charger_present && n810bm_known_battery_present(bm)) {
 663 +               /* Known battery and charger are connected */
 664 +               if (bm->charger_enabled) {
 665 +                       /* Charger is enabled */
 666 +                       if (!lipocharge_is_charging(&bm->charger)) {
 667 +                               //TODO start charging, if battery is below some threshold
 668 +                               n810bm_start_charge(bm);
 669 +                       }
 670 +               }
 671 +       }
 672 +
 673 +       if (lipocharge_is_charging(&bm->charger) && !bm->charger_present) {
 674 +               /* Charger was unplugged. */
 675 +               n810bm_stop_charge(bm);
 676 +       }
 677 +
 678 +       mutex_unlock(&bm->mutex);
 679 +       schedule_delayed_work(&bm->periodic_check_work,
 680 +                             round_jiffies_relative(N810BM_CHECK_INTERVAL));
 681 +}
 682 +
 683 +static void n810bm_adc_irq_handler(unsigned long data)
 684 +{
 685 +       struct n810bm *bm = (struct n810bm *)data;
 686 +
 687 +       retu_ack_irq(RETU_INT_ADCS);
 688 +       //TODO
 689 +dev_info(&bm->pdev->dev, "ADC interrupt triggered\n");
 690 +}
 691 +
 692 +static void n810bm_tahvo_current_measure_work(struct work_struct *work)
 693 +{
 694 +       struct n810bm *bm = container_of(work, struct n810bm, currmeas_irq_work);
 695 +       int res, ma, mv, temp;
 696 +
 697 +       mutex_lock(&bm->mutex);
 698 +       if (!lipocharge_is_charging(&bm->charger))
 699 +               goto out_unlock;
 700 +
 701 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
 702 +                     TAHVO_REG_CHGCTL_PWMOVR |
 703 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
 704 +                     TAHVO_REG_CHGCTL_PWMOVR);
 705 +       ma = n810bm_measure_batt_current(bm);
 706 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
 707 +                     TAHVO_REG_CHGCTL_PWMOVR |
 708 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
 709 +                     TAHVO_REG_CHGCTL_PWMOVR |
 710 +                     TAHVO_REG_CHGCTL_PWMOVRZERO);
 711 +       msleep(10);
 712 +       mv = n810bm_measure_batt_voltage(bm);
 713 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
 714 +                     TAHVO_REG_CHGCTL_PWMOVR |
 715 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
 716 +                     0);
 717 +       temp = n810bm_measure_batt_temp(bm);
 718 +       if (WARN_ON(mv < 0))
 719 +               goto out_unlock;
 720 +       if (WARN_ON(temp < 0))
 721 +               goto out_unlock;
 722 +
 723 +       if (bm->verbose_charge_log) {
 724 +               dev_info(&bm->pdev->dev,
 725 +                        "Battery charge state: %d mV, %d mA (%s)",
 726 +                        mv, ma,
 727 +                        (ma <= 0) ? "discharging" : "charging");
 728 +       }
 729 +       res = lipocharge_update_state(&bm->charger, mv, ma, temp);
 730 +       if (res) {
 731 +               if (res > 0)
 732 +                       dev_info(&bm->pdev->dev, "Battery fully charged");
 733 +               n810bm_stop_charge(bm);
 734 +       }
 735 +out_unlock:
 736 +       mutex_unlock(&bm->mutex);
 737 +}
 738 +
 739 +static void n810bm_tahvo_current_measure_irq_handler(unsigned long data)
 740 +{
 741 +       struct n810bm *bm = (struct n810bm *)data;
 742 +
 743 +       tahvo_ack_irq(TAHVO_INT_BATCURR);
 744 +       schedule_work(&bm->currmeas_irq_work);
 745 +}
 746 +
 747 +#define DEFINE_ATTR_NOTIFY(attr_name)                                          \
 748 +       void n810bm_notify_##attr_name(struct n810bm *bm)                       \
 749 +       {                                                                       \
 750 +               set_bit(N810BM_NOTIFY_##attr_name, &bm->notify_flags);          \
 751 +               wmb();                                                          \
 752 +               schedule_work(&bm->notify_work);                                \
 753 +       }
 754 +
 755 +#define DEFINE_SHOW_INT_FUNC(name, member)                                     \
 756 +       static ssize_t n810bm_attr_##name##_show(struct device *dev,            \
 757 +                                                struct device_attribute *attr, \
 758 +                                                char *buf)                     \
 759 +       {                                                                       \
 760 +               struct n810bm *bm = device_to_n810bm(dev);                      \
 761 +               ssize_t count;                                                  \
 762 +                                                                               \
 763 +               mutex_lock(&bm->mutex);                                         \
 764 +               count = snprintf(buf, PAGE_SIZE, "%d\n", (int)(bm->member));    \
 765 +               mutex_unlock(&bm->mutex);                                       \
 766 +                                                                               \
 767 +               return count;                                                   \
 768 +       }
 769 +
 770 +#define DEFINE_STORE_INT_FUNC(name, member)                                    \
 771 +       static ssize_t n810bm_attr_##name##_store(struct device *dev,           \
 772 +                                                 struct device_attribute *attr,\
 773 +                                                 const char *buf, size_t count)\
 774 +       {                                                                       \
 775 +               struct n810bm *bm = device_to_n810bm(dev);                      \
 776 +               long val;                                                       \
 777 +               int err;                                                        \
 778 +                                                                               \
 779 +               mutex_lock(&bm->mutex);                                         \
 780 +               err = strict_strtol(buf, 0, &val);                              \
 781 +               if (!err)                                                       \
 782 +                       bm->member = (typeof(bm->member))val;                   \
 783 +               mutex_unlock(&bm->mutex);                                       \
 784 +                                                                               \
 785 +               return err ? err : count;                                       \
 786 +       }
 787 +
 788 +#define DEFINE_ATTR_SHOW_INT(name, member)                                     \
 789 +       DEFINE_SHOW_INT_FUNC(name, member)                                      \
 790 +       static DEVICE_ATTR(name, S_IRUGO,                                       \
 791 +                          n810bm_attr_##name##_show, NULL);
 792 +
 793 +#define DEFINE_ATTR_SHOW_STORE_INT(name, member)                               \
 794 +       DEFINE_SHOW_INT_FUNC(name, member)                                      \
 795 +       DEFINE_STORE_INT_FUNC(name, member)                                     \
 796 +       static DEVICE_ATTR(name, S_IRUGO | S_IWUSR,                             \
 797 +                          n810bm_attr_##name##_show,                           \
 798 +                          n810bm_attr_##name##_store);
 799 +
 800 +DEFINE_ATTR_SHOW_INT(battery_present, battery_present);
 801 +DEFINE_ATTR_SHOW_INT(charger_present, charger_present);
 802 +DEFINE_ATTR_SHOW_INT(charger_pwm, active_current_pwm);
 803 +static DEFINE_ATTR_NOTIFY(charger_pwm);
 804 +DEFINE_ATTR_SHOW_STORE_INT(charger_enable, charger_enabled);
 805 +DEFINE_ATTR_SHOW_STORE_INT(charger_verbose, verbose_charge_log);
 806 +
 807 +static ssize_t n810bm_attr_battery_charging(struct device *dev,
 808 +                                           struct device_attribute *attr,
 809 +                                           char *buf)
 810 +{
 811 +       struct n810bm *bm = device_to_n810bm(dev);
 812 +       ssize_t count;
 813 +
 814 +       mutex_lock(&bm->mutex);
 815 +       count = snprintf(buf, PAGE_SIZE, "%d\n",
 816 +                        (int)lipocharge_is_charging(&bm->charger));
 817 +       mutex_unlock(&bm->mutex);
 818 +
 819 +       return count;
 820 +}
 821 +static DEVICE_ATTR(battery_charging, S_IRUGO,
 822 +                  n810bm_attr_battery_charging, NULL);
 823 +static DEFINE_ATTR_NOTIFY(battery_charging);
 824 +
 825 +static ssize_t n810bm_attr_battery_level_show(struct device *dev,
 826 +                                             struct device_attribute *attr,
 827 +                                             char *buf)
 828 +{
 829 +       struct n810bm *bm = device_to_n810bm(dev);
 830 +       ssize_t count = -ENODEV;
 831 +       int millivolt;
 832 +
 833 +       mutex_lock(&bm->mutex);
 834 +       if (!bm->battery_present || lipocharge_is_charging(&bm->charger))
 835 +               millivolt = 0;
 836 +       else
 837 +               millivolt = n810bm_measure_batt_voltage(bm);
 838 +       if (millivolt >= 0) {
 839 +               count = snprintf(buf, PAGE_SIZE, "%u\n",
 840 +                                n810bm_mvolt2percent(millivolt));
 841 +       }
 842 +       mutex_unlock(&bm->mutex);
 843 +
 844 +       return count;
 845 +}
 846 +static DEVICE_ATTR(battery_level, S_IRUGO,
 847 +                  n810bm_attr_battery_level_show, NULL);
 848 +
 849 +static ssize_t n810bm_attr_battery_capacity_show(struct device *dev,
 850 +                                                struct device_attribute *attr,
 851 +                                                char *buf)
 852 +{
 853 +       struct n810bm *bm = device_to_n810bm(dev);
 854 +       ssize_t count;
 855 +       int capacity = 0;
 856 +
 857 +       mutex_lock(&bm->mutex);
 858 +       if (n810bm_known_battery_present(bm))
 859 +               capacity = (int)bm->capacity;
 860 +       count = snprintf(buf, PAGE_SIZE, "%d\n", capacity);
 861 +       mutex_unlock(&bm->mutex);
 862 +
 863 +       return count;
 864 +}
 865 +static DEVICE_ATTR(battery_capacity, S_IRUGO,
 866 +                  n810bm_attr_battery_capacity_show, NULL);
 867 +
 868 +static ssize_t n810bm_attr_battery_temp_show(struct device *dev,
 869 +                                            struct device_attribute *attr,
 870 +                                            char *buf)
 871 +{
 872 +       struct n810bm *bm = device_to_n810bm(dev);
 873 +       ssize_t count = -ENODEV;
 874 +       int k;
 875 +
 876 +       mutex_lock(&bm->mutex);
 877 +       k = n810bm_measure_batt_temp(bm);
 878 +       if (k >= 0)
 879 +               count = snprintf(buf, PAGE_SIZE, "%d\n", k);
 880 +       mutex_unlock(&bm->mutex);
 881 +
 882 +       return count;
 883 +}
 884 +static DEVICE_ATTR(battery_temp, S_IRUGO,
 885 +                  n810bm_attr_battery_temp_show, NULL);
 886 +
 887 +static ssize_t n810bm_attr_charger_voltage_show(struct device *dev,
 888 +                                               struct device_attribute *attr,
 889 +                                               char *buf)
 890 +{
 891 +       struct n810bm *bm = device_to_n810bm(dev);
 892 +       ssize_t count = -ENODEV;
 893 +       int mv = 0;
 894 +
 895 +       mutex_lock(&bm->mutex);
 896 +       if (bm->charger_present)
 897 +               mv = n810bm_measure_charger_voltage(bm);
 898 +       if (mv >= 0)
 899 +               count = snprintf(buf, PAGE_SIZE, "%d\n", mv);
 900 +       mutex_unlock(&bm->mutex);
 901 +
 902 +       return count;
 903 +}
 904 +static DEVICE_ATTR(charger_voltage, S_IRUGO,
 905 +                  n810bm_attr_charger_voltage_show, NULL);
 906 +
 907 +static ssize_t n810bm_attr_backup_battery_voltage_show(struct device *dev,
 908 +                                                      struct device_attribute *attr,
 909 +                                                      char *buf)
 910 +{
 911 +       struct n810bm *bm = device_to_n810bm(dev);
 912 +       ssize_t count = -ENODEV;
 913 +       int mv;
 914 +
 915 +       mutex_lock(&bm->mutex);
 916 +       mv = n810bm_measure_backup_batt_voltage(bm);
 917 +       if (mv >= 0)
 918 +               count = snprintf(buf, PAGE_SIZE, "%d\n", mv);
 919 +       mutex_unlock(&bm->mutex);
 920 +
 921 +       return count;
 922 +}
 923 +static DEVICE_ATTR(backup_battery_voltage, S_IRUGO,
 924 +                  n810bm_attr_backup_battery_voltage_show, NULL);
 925 +
 926 +static ssize_t n810bm_attr_battery_current_show(struct device *dev,
 927 +                                               struct device_attribute *attr,
 928 +                                               char *buf)
 929 +{
 930 +       struct n810bm *bm = device_to_n810bm(dev);
 931 +       ssize_t count = -ENODEV;
 932 +       int ma = 0;
 933 +
 934 +       mutex_lock(&bm->mutex);
 935 +       if (bm->battery_present)
 936 +               ma = n810bm_measure_batt_current_async(bm);
 937 +       count = snprintf(buf, PAGE_SIZE, "%d\n", ma);
 938 +       mutex_unlock(&bm->mutex);
 939 +
 940 +       return count;
 941 +}
 942 +static DEVICE_ATTR(battery_current, S_IRUGO,
 943 +                  n810bm_attr_battery_current_show, NULL);
 944 +
 945 +static const struct device_attribute *n810bm_attrs[] = {
 946 +       &dev_attr_battery_present,
 947 +       &dev_attr_battery_level,
 948 +       &dev_attr_battery_charging,
 949 +       &dev_attr_battery_current,
 950 +       &dev_attr_battery_capacity,
 951 +       &dev_attr_battery_temp,
 952 +       &dev_attr_backup_battery_voltage,
 953 +       &dev_attr_charger_present,
 954 +       &dev_attr_charger_verbose,
 955 +       &dev_attr_charger_voltage,
 956 +       &dev_attr_charger_enable,
 957 +       &dev_attr_charger_pwm,
 958 +};
 959 +
 960 +static void n810bm_notify_work(struct work_struct *work)
 961 +{
 962 +       struct n810bm *bm = container_of(work, struct n810bm, notify_work);
 963 +       unsigned long notify_flags;
 964 +
 965 +       notify_flags = xchg(&bm->notify_flags, 0);
 966 +       mb();
 967 +
 968 +#define do_notify(attr_name)                                           \
 969 +       do {                                                            \
 970 +               if (notify_flags & (1 << N810BM_NOTIFY_##attr_name)) {  \
 971 +                       sysfs_notify(&bm->pdev->dev.kobj, NULL,         \
 972 +                                    dev_attr_##attr_name.attr.name);   \
 973 +               }                                                       \
 974 +       } while (0)
 975 +
 976 +       do_notify(battery_charging);
 977 +       do_notify(charger_pwm);
 978 +}
 979 +
 980 +static int n810bm_charger_set_current_pwm(struct lipocharge *c,
 981 +                                         unsigned int duty_cycle)
 982 +{
 983 +       struct n810bm *bm = container_of(c, struct n810bm, charger);
 984 +       int err = -EINVAL;
 985 +
 986 +       WARN_ON(!mutex_is_locked(&bm->mutex));
 987 +       if (WARN_ON(duty_cycle > 0xFF))
 988 +               goto out;
 989 +       if (WARN_ON(!bm->charger_enabled))
 990 +               goto out;
 991 +       if (WARN_ON(!bm->battery_present || !bm->charger_present))
 992 +               goto out;
 993 +
 994 +       if (duty_cycle != bm->active_current_pwm) {
 995 +               bm->active_current_pwm = duty_cycle;
 996 +               tahvo_write(bm, TAHVO_REG_CHGCURR, duty_cycle);
 997 +               n810bm_notify_charger_pwm(bm);
 998 +       }
 999 +
1000 +       err = 0;
1001 +out:
1002 +
1003 +       return err;
1004 +}
1005 +
1006 +static void n810bm_charger_emergency(struct lipocharge *c)
1007 +{
1008 +       struct n810bm *bm = container_of(c, struct n810bm, charger);
1009 +
1010 +       n810bm_emergency(bm, "Battery charger fault");
1011 +}
1012 +
1013 +static void n810bm_hw_exit(struct n810bm *bm)
1014 +{
1015 +       n810bm_stop_charge(bm);
1016 +       retu_write(bm, RETU_REG_ADCSCR, 0);
1017 +}
1018 +
1019 +static int n810bm_hw_init(struct n810bm *bm)
1020 +{
1021 +       int err;
1022 +
1023 +       err = n810bm_check_adc_sanity(bm);
1024 +       if (err)
1025 +               return err;
1026 +
1027 +       n810bm_stop_charge(bm);
1028 +
1029 +       return 0;
1030 +}
1031 +
1032 +static void n810bm_cancel_and_flush_work(struct n810bm *bm)
1033 +{
1034 +       cancel_delayed_work_sync(&bm->periodic_check_work);
1035 +       cancel_work_sync(&bm->notify_work);
1036 +       cancel_work_sync(&bm->currmeas_irq_work);
1037 +       flush_scheduled_work();
1038 +}
1039 +
1040 +static int n810bm_device_init(struct n810bm *bm)
1041 +{
1042 +       int attr_index;
1043 +       int err;
1044 +
1045 +       bm->charger.rate = LIPORATE_p6C;
1046 +       bm->charger.top_voltage = 4100;
1047 +       bm->charger.duty_cycle_max = 0xFF;
1048 +       bm->charger.set_current_pwm = n810bm_charger_set_current_pwm;
1049 +       bm->charger.emergency = n810bm_charger_emergency;
1050 +       lipocharge_init(&bm->charger, &bm->pdev->dev);
1051 +
1052 +       err = n810bm_hw_init(bm);
1053 +       if (err)
1054 +               goto error;
1055 +       for (attr_index = 0; attr_index < ARRAY_SIZE(n810bm_attrs); attr_index++) {
1056 +               err = device_create_file(&bm->pdev->dev, n810bm_attrs[attr_index]);
1057 +               if (err)
1058 +                       goto err_unwind_attrs;
1059 +       }
1060 +       err = retu_request_irq(RETU_INT_ADCS,
1061 +                              n810bm_adc_irq_handler,
1062 +                              (unsigned long)bm, "n810bm");
1063 +       if (err)
1064 +               goto err_unwind_attrs;
1065 +       err = tahvo_request_irq(TAHVO_INT_BATCURR,
1066 +                               n810bm_tahvo_current_measure_irq_handler,
1067 +                               (unsigned long)bm, "n810bm");
1068 +       if (err)
1069 +               goto err_free_retu_irq;
1070 +       tahvo_disable_irq(TAHVO_INT_BATCURR);
1071 +
1072 +       schedule_delayed_work(&bm->periodic_check_work,
1073 +                             round_jiffies_relative(N810BM_CHECK_INTERVAL));
1074 +
1075 +       bm->initialized = 1;
1076 +       dev_info(&bm->pdev->dev, "Battery management initialized");
1077 +
1078 +       return 0;
1079 +
1080 +err_free_retu_irq:
1081 +       retu_free_irq(RETU_INT_ADCS);
1082 +err_unwind_attrs:
1083 +       for (attr_index--; attr_index >= 0; attr_index--)
1084 +               device_remove_file(&bm->pdev->dev, n810bm_attrs[attr_index]);
1085 +/*err_exit:*/
1086 +       n810bm_hw_exit(bm);
1087 +error:
1088 +       n810bm_cancel_and_flush_work(bm);
1089 +
1090 +       return err;
1091 +}
1092 +
1093 +static void n810bm_device_exit(struct n810bm *bm)
1094 +{
1095 +       int i;
1096 +
1097 +       if (!bm->initialized)
1098 +               return;
1099 +
1100 +       lipocharge_exit(&bm->charger);
1101 +       tahvo_free_irq(TAHVO_INT_BATCURR);
1102 +       retu_free_irq(RETU_INT_ADCS);
1103 +       for (i = 0; i < ARRAY_SIZE(n810bm_attrs); i++)
1104 +               device_remove_file(&bm->pdev->dev, n810bm_attrs[i]);
1105 +
1106 +       n810bm_cancel_and_flush_work(bm);
1107 +
1108 +       n810bm_hw_exit(bm);
1109 +       release_firmware(bm->pmm_block);
1110 +
1111 +       bm->initialized = 0;
1112 +}
1113 +
1114 +static void n810bm_pmm_block_found(const struct firmware *fw, void *context)
1115 +{
1116 +       struct n810bm *bm = context;
1117 +       int err;
1118 +
1119 +       if (!fw) {
1120 +               dev_err(&bm->pdev->dev,
1121 +                       "CAL PMM block image file not found");
1122 +               goto error;
1123 +       }
1124 +       if (fw->size != N810BM_PMM_BLOCK_SIZE ||
1125 +           memcmp(fw->data, "BME-PMM-BLOCK01", 15) != 0) {
1126 +               dev_err(&bm->pdev->dev,
1127 +                       "CAL PMM block image file has an invalid format");
1128 +               goto error;
1129 +       }
1130 +
1131 +       bm->pmm_block = fw;
1132 +       err = n810bm_device_init(bm);
1133 +       if (err) {
1134 +               dev_err(&bm->pdev->dev,
1135 +                       "Failed to initialized battery management (%d)", err);
1136 +               goto error;
1137 +       }
1138 +
1139 +       return;
1140 +error:
1141 +       release_firmware(fw);
1142 +}
1143 +
1144 +static int __devinit n810bm_probe(struct platform_device *pdev)
1145 +{
1146 +       struct n810bm *bm;
1147 +       int err;
1148 +
1149 +       bm = kzalloc(sizeof(*bm), GFP_KERNEL);
1150 +       if (!bm)
1151 +               return -ENOMEM;
1152 +       bm->pdev = pdev;
1153 +       platform_set_drvdata(pdev, bm);
1154 +       mutex_init(&bm->mutex);
1155 +       INIT_DELAYED_WORK(&bm->periodic_check_work, n810bm_periodic_check_work);
1156 +       INIT_WORK(&bm->notify_work, n810bm_notify_work);
1157 +       INIT_WORK(&bm->currmeas_irq_work, n810bm_tahvo_current_measure_work);
1158 +
1159 +       dev_info(&bm->pdev->dev, "Requesting CAL BME PMM block firmware file "
1160 +                N810BM_PMM_BLOCK_FILENAME);
1161 +       err = request_firmware_nowait(THIS_MODULE, 1,
1162 +                                     N810BM_PMM_BLOCK_FILENAME,
1163 +                                     &bm->pdev->dev, GFP_KERNEL,
1164 +                                     bm, n810bm_pmm_block_found);
1165 +       if (err) {
1166 +               dev_err(&bm->pdev->dev,
1167 +                       "Failed to request CAL PMM block image file (%d)", err);
1168 +               goto err_free;
1169 +       }
1170 +
1171 +       return 0;
1172 +
1173 +err_free:
1174 +       kfree(bm);
1175 +
1176 +       return err;
1177 +}
1178 +
1179 +static int __devexit n810bm_remove(struct platform_device *pdev)
1180 +{
1181 +       struct n810bm *bm = platform_get_drvdata(pdev);
1182 +
1183 +       n810bm_device_exit(bm);
1184 +
1185 +       kfree(bm);
1186 +       platform_set_drvdata(pdev, NULL);
1187 +
1188 +       return 0;
1189 +}
1190 +
1191 +static struct platform_driver n810bm_driver = {
1192 +       .remove         = __devexit_p(n810bm_remove),
1193 +       .driver         = {
1194 +               .name   = "n810bm",
1195 +       }
1196 +};
1197 +
1198 +static int __init n810bm_modinit(void)
1199 +{
1200 +       return platform_driver_probe(&n810bm_driver, n810bm_probe);
1201 +}
1202 +module_init(n810bm_modinit);
1203 +
1204 +static void __exit n810bm_modexit(void)
1205 +{
1206 +       platform_driver_unregister(&n810bm_driver);
1207 +}
1208 +module_exit(n810bm_modexit);
1209 +
1210 +MODULE_DESCRIPTION("Nokia n810 battery management");
1211 +MODULE_FIRMWARE(N810BM_PMM_BLOCK_FILENAME);
1212 +MODULE_LICENSE("GPL");
1213 +MODULE_AUTHOR("Michael Buesch");
1214 Index: linux-2.6.37/drivers/cbus/retu.c
1215 ===================================================================
1216 --- linux-2.6.37.orig/drivers/cbus/retu.c       2011-02-06 14:05:49.829387442 +0100
1217 +++ linux-2.6.37/drivers/cbus/retu.c    2011-02-08 17:33:18.981369017 +0100
1218 @@ -85,10 +85,10 @@
1219   *
1220   * This function writes a value to the specified register
1221   */
1222 -void retu_write_reg(int reg, u16 val)
1223 +int retu_write_reg(int reg, u16 val)
1224  {
1225         BUG_ON(!retu_initialized);
1226 -       cbus_write_reg(cbus_host, RETU_ID, reg, val);
1227 +       return cbus_write_reg(cbus_host, RETU_ID, reg, val);
1228  }
1229
1230  void retu_set_clear_reg_bits(int reg, u16 set, u16 clear)
1231 @@ -459,6 +459,7 @@
1232  EXPORT_SYMBOL(retu_ack_irq);
1233  EXPORT_SYMBOL(retu_read_reg);
1234  EXPORT_SYMBOL(retu_write_reg);
1235 +EXPORT_SYMBOL(retu_read_adc);
1236
1237  subsys_initcall(retu_init);
1238  module_exit(retu_exit);
1239 Index: linux-2.6.37/drivers/cbus/retu.h
1240 ===================================================================
1241 --- linux-2.6.37.orig/drivers/cbus/retu.h       2011-02-06 14:05:49.829387442 +0100
1242 +++ linux-2.6.37/drivers/cbus/retu.h    2011-02-06 14:05:49.886395793 +0100
1243 @@ -40,6 +40,8 @@
1244  #define RETU_REG_CTRL_CLR      0x0f    /* Regulator clear register */
1245  #define RETU_REG_CTRL_SET      0x10    /* Regulator set register */
1246  #define RETU_REG_STATUS                0x16    /* Status register */
1247 +#define  RETU_REG_STATUS_BATAVAIL      0x0100 /* Battery available */
1248 +#define  RETU_REG_STATUS_CHGPLUG       0x1000 /* Charger is plugged in */
1249  #define RETU_REG_WATCHDOG      0x17    /* Watchdog register */
1250  #define RETU_REG_AUDTXR                0x18    /* Audio Codec Tx register */
1251  #define RETU_REG_MAX           0x1f
1252 @@ -57,8 +59,25 @@
1253
1254  #define        MAX_RETU_IRQ_HANDLERS   16
1255
1256 +/* ADC channels */
1257 +#define RETU_ADC_GND           0x00 /* Ground */
1258 +#define RETU_ADC_BSI           0x01 /* Battery Size Indicator */
1259 +#define RETU_ADC_BATTEMP       0x02 /* Battery temperature */
1260 +#define RETU_ADC_CHGVOLT       0x03 /* Charger voltage */
1261 +#define RETU_ADC_HEADSET       0x04 /* Headset detection */
1262 +#define RETU_ADC_HOOKDET       0x05 /* Hook detection */
1263 +#define RETU_ADC_RFGP          0x06 /* RF GP */
1264 +#define RETU_ADC_WBTX          0x07 /* Wideband Tx detection */
1265 +#define RETU_ADC_BATTVOLT      0x08 /* Battery voltage measurement */
1266 +#define RETU_ADC_GND2          0x09 /* Ground */
1267 +#define RETU_ADC_LIGHTSENS     0x0A /* Light sensor */
1268 +#define RETU_ADC_LIGHTTEMP     0x0B /* Light sensor temperature */
1269 +#define RETU_ADC_BKUPVOLT      0x0C /* Backup battery voltage */
1270 +#define RETU_ADC_TEMP          0x0D /* RETU temperature */
1271 +
1272 +
1273  int retu_read_reg(int reg);
1274 -void retu_write_reg(int reg, u16 val);
1275 +int retu_write_reg(int reg, u16 val);
1276  void retu_set_clear_reg_bits(int reg, u16 set, u16 clear);
1277  int retu_read_adc(int channel);
1278  int retu_request_irq(int id, void *irq_handler, unsigned long arg, char *name);
1279 Index: linux-2.6.37/arch/arm/mach-omap2/board-n8x0.c
1280 ===================================================================
1281 --- linux-2.6.37.orig/arch/arm/mach-omap2/board-n8x0.c  2011-02-06 14:05:49.815385390 +0100
1282 +++ linux-2.6.37/arch/arm/mach-omap2/board-n8x0.c       2011-02-06 14:05:49.886395793 +0100
1283 @@ -907,6 +907,17 @@
1284                                     ARRAY_SIZE(n8x0_gpio_switches));
1285  }
1286
1287 +static struct platform_device n810_bm_device = {
1288 +       .name           = "n810bm",
1289 +       .id             = -1,
1290 +};
1291 +
1292 +static void __init n810_bm_init(void)
1293 +{
1294 +       if (platform_device_register(&n810_bm_device))
1295 +               BUG();
1296 +}
1297 +
1298  static void __init n8x0_init_machine(void)
1299  {
1300         omap2420_mux_init(board_mux, OMAP_PACKAGE_ZAC);
1301 @@ -933,6 +944,8 @@
1302         n8x0_onenand_init();
1303         n8x0_mmc_init();
1304         n8x0_usb_init();
1305 +
1306 +       n810_bm_init();
1307  }
1308
1309  MACHINE_START(NOKIA_N800, "Nokia N800")
1310 Index: linux-2.6.37/drivers/cbus/lipocharge.c
1311 ===================================================================
1312 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
1313 +++ linux-2.6.37/drivers/cbus/lipocharge.c      2011-02-09 12:42:58.243147563 +0100
1314 @@ -0,0 +1,183 @@
1315 +/*
1316 + *   Generic LIPO battery charger
1317 + *
1318 + *   Copyright (c) 2010-2011 Michael Buesch <mb@bu3sch.de>
1319 + *
1320 + *   This program is free software; you can redistribute it and/or
1321 + *   modify it under the terms of the GNU General Public License
1322 + *   as published by the Free Software Foundation; either version 2
1323 + *   of the License, or (at your option) any later version.
1324 + *
1325 + *   This program is distributed in the hope that it will be useful,
1326 + *   but WITHOUT ANY WARRANTY; without even the implied warranty of
1327 + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
1328 + *   GNU General Public License for more details.
1329 + */
1330 +
1331 +#define DEBUG
1332 +
1333 +#include "lipocharge.h"
1334 +
1335 +#include <linux/slab.h>
1336 +
1337 +
1338 +/* Hysteresis constants */
1339 +#define CURRENT_HYST           30 /* mA */
1340 +#define VOLTAGE_HYST           10 /* mV */
1341 +
1342 +/* Threshold constants */
1343 +#define FINISH_CURRENT_PERCENT 3
1344 +
1345 +
1346 +/* Returns the requested first-stage charge current in mA */
1347 +static inline unsigned int get_stage1_charge_current(struct lipocharge *c)
1348 +{
1349 +       /* current = (capacity * C) */
1350 +       return c->capacity * c->rate / 1000;
1351 +}
1352 +
1353 +void lipocharge_init(struct lipocharge *c, struct device *dev)
1354 +{
1355 +       c->dev = dev;
1356 +       c->state = LIPO_IDLE;
1357 +}
1358 +
1359 +void lipocharge_exit(struct lipocharge *c)
1360 +{
1361 +       c->state = LIPO_IDLE;
1362 +}
1363 +
1364 +int lipocharge_start(struct lipocharge *c)
1365 +{
1366 +       int err;
1367 +
1368 +       if (c->state != LIPO_IDLE)
1369 +               return -EBUSY;
1370 +       if (!c->set_current_pwm || !c->emergency)
1371 +               return -EINVAL;
1372 +       if (!c->top_voltage || c->top_voltage > 4200)
1373 +               return -EINVAL;
1374 +
1375 +       c->active_duty_cycle = 0;
1376 +       err = c->set_current_pwm(c, c->active_duty_cycle);
1377 +       if (err)
1378 +               return err;
1379 +       c->state = LIPO_FIRST_STAGE;
1380 +
1381 +       return 0;
1382 +}
1383 +
1384 +void lipocharge_stop(struct lipocharge *c)
1385 +{
1386 +       if (c->state == LIPO_IDLE)
1387 +               return;
1388 +       c->state = LIPO_IDLE;
1389 +}
1390 +
1391 +static int lipocharge_increase_current(struct lipocharge *c,
1392 +                                      unsigned int inc_permille)
1393 +{
1394 +       int old_pwm, new_pwm;
1395 +
1396 +       if (c->active_duty_cycle >= c->duty_cycle_max)
1397 +               return 0;
1398 +
1399 +       old_pwm = c->active_duty_cycle;
1400 +       new_pwm = old_pwm + (c->duty_cycle_max * inc_permille / 1000);
1401 +       new_pwm = min(new_pwm, (int)c->duty_cycle_max);
1402 +       c->active_duty_cycle = new_pwm;
1403 +
1404 +       dev_dbg(c->dev, "lipo: Increasing duty_cycle by "
1405 +               "%u permille (0x%02X -> 0x%02X)",
1406 +               inc_permille, old_pwm, new_pwm);
1407 +
1408 +       return c->set_current_pwm(c, c->active_duty_cycle);
1409 +}
1410 +
1411 +static int lipocharge_decrease_current(struct lipocharge *c,
1412 +                                      unsigned int dec_permille)
1413 +{
1414 +       int old_pwm, new_pwm;
1415 +
1416 +       if (c->active_duty_cycle <= 0)
1417 +               return 0;
1418 +
1419 +       old_pwm = c->active_duty_cycle;
1420 +       new_pwm = old_pwm - (c->duty_cycle_max * dec_permille / 1000);
1421 +       new_pwm = max(0, new_pwm);
1422 +       c->active_duty_cycle = new_pwm;
1423 +
1424 +       dev_dbg(c->dev, "lipo: Decreasing duty_cycle by "
1425 +               "%u permille (0x%02X -> 0x%02X)",
1426 +               dec_permille, old_pwm, new_pwm);
1427 +
1428 +       return c->set_current_pwm(c, c->active_duty_cycle);
1429 +}
1430 +
1431 +/** lipocharge_update_state - Update the charge state
1432 + * @c: The context.
1433 + * @voltage_mV: The measured battery voltage.
1434 + * @current_mA: The measured charge current.
1435 + *             negative -> drain.
1436 + *             positive -> charge.
1437 + * @temp_K: Battery temperature in K.
1438 + *
1439 + * Returns 0 on success, -1 on error.
1440 + * Returns 1, if the charging process is finished.
1441 + */
1442 +int lipocharge_update_state(struct lipocharge *c,
1443 +                           unsigned int voltage_mV,
1444 +                           int current_mA,
1445 +                           unsigned int temp_K)
1446 +{
1447 +       int requested_current, current_diff;
1448 +       int err;
1449 +       unsigned int permille;
1450 +
1451 +       //TODO temp
1452 +
1453 +restart:
1454 +       switch (c->state) {
1455 +       case LIPO_IDLE:
1456 +               dev_err(c->dev, "%s: called while idle", __func__);
1457 +               return -EINVAL;
1458 +       case LIPO_FIRST_STAGE:  /* Constant current */
1459 +//printk("GOT %u %d %u\n", voltage_mV, current_mA, temp_K);
1460 +               if (voltage_mV >= c->top_voltage) {
1461 +                       /* Float voltage reached.
1462 +                        * Switch charger mode to "constant current" */
1463 +                       c->state = LIPO_SECOND_STAGE;
1464 +                       dev_dbg(c->dev, "Switched to second charging stage.");
1465 +                       goto restart;
1466 +               }
1467 +               /* Float voltage not reached, yet.
1468 +                * Try to get the requested constant current. */
1469 +               requested_current = get_stage1_charge_current(c);
1470 +               if (current_mA < 0)
1471 +                       current_mA = 0;
1472 +               current_diff = requested_current - current_mA;
1473 +               if (abs(requested_current - current_mA) > CURRENT_HYST) {
1474 +                       if (current_diff > 0) {
1475 +                               /* Increase current */
1476 +                               permille = current_diff * 1000 / requested_current;
1477 +                               permille /= 2;
1478 +                               err = lipocharge_increase_current(c, permille);
1479 +                               if (err)
1480 +                                       return err;
1481 +                       } else {
1482 +                               /* Decrease current */
1483 +                               permille = (-current_diff) * 1000 / requested_current;
1484 +                               permille /= 2;
1485 +                               err = lipocharge_decrease_current(c, permille);
1486 +                               if (err)
1487 +                                       return err;
1488 +                       }
1489 +               }
1490 +               break;
1491 +       case LIPO_SECOND_STAGE: /* Constant voltage */
1492 +               //TODO
1493 +               break;
1494 +       }
1495 +
1496 +       return 0;
1497 +}
1498 Index: linux-2.6.37/drivers/cbus/lipocharge.h
1499 ===================================================================
1500 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
1501 +++ linux-2.6.37/drivers/cbus/lipocharge.h      2011-02-07 20:07:29.669098631 +0100
1502 @@ -0,0 +1,60 @@
1503 +#ifndef LIPOCHARGE_H_
1504 +#define LIPOCHARGE_H_
1505 +
1506 +#include <linux/types.h>
1507 +#include <linux/device.h>
1508 +
1509 +
1510 +#define LIPORATE(a,b)  (((a) * 1000) + ((b) * 100))
1511 +#define LIPORATE_p6C   LIPORATE(0,6)   /* 0.6C */
1512 +
1513 +enum lipocharge_state {
1514 +       LIPO_IDLE,              /* Not charging */
1515 +       LIPO_FIRST_STAGE,       /* Charging: constant current */
1516 +       LIPO_SECOND_STAGE,      /* Charging: constant voltage */
1517 +};
1518 +
1519 +/** struct lipocharge - A generic LIPO charger
1520 + *
1521 + * @capacity: Battery capacity in mAh.
1522 + * @rate: Charge rate.
1523 + * @top_voltage: Fully charged voltage, in mV.
1524 + * @duty_cycle_max: Max value for duty_cycle.
1525 + *
1526 + * @set_charge_current: Set the charge current PWM duty cycle.
1527 + * @emergency: Something went wrong. Force shutdown.
1528 + */
1529 +struct lipocharge {
1530 +       unsigned int capacity;
1531 +       unsigned int rate;
1532 +       unsigned int top_voltage;
1533 +       unsigned int duty_cycle_max;
1534 +
1535 +       int (*set_current_pwm)(struct lipocharge *c, unsigned int duty_cycle);
1536 +       void (*emergency)(struct lipocharge *c);
1537 +
1538 +       /* internal */
1539 +       struct device *dev;
1540 +       enum lipocharge_state state;
1541 +       unsigned int active_duty_cycle;
1542 +
1543 +       //TODO implement timer to cut power after maximum charge time.
1544 +};
1545 +
1546 +void lipocharge_init(struct lipocharge *c, struct device *dev);
1547 +void lipocharge_exit(struct lipocharge *c);
1548 +
1549 +int lipocharge_start(struct lipocharge *c);
1550 +void lipocharge_stop(struct lipocharge *c);
1551 +
1552 +int lipocharge_update_state(struct lipocharge *c,
1553 +                           unsigned int voltage_mV,
1554 +                           int current_mA,
1555 +                           unsigned int temp_K);
1556 +
1557 +static inline bool lipocharge_is_charging(struct lipocharge *c)
1558 +{
1559 +       return (c->state != LIPO_IDLE);
1560 +}
1561 +
1562 +#endif /* LIPOCHARGE_H_ */
1563 Index: linux-2.6.37/drivers/cbus/tahvo.h
1564 ===================================================================
1565 --- linux-2.6.37.orig/drivers/cbus/tahvo.h      2011-02-06 14:05:49.830387588 +0100
1566 +++ linux-2.6.37/drivers/cbus/tahvo.h   2011-02-06 16:22:25.902331536 +0100
1567 @@ -30,17 +30,28 @@
1568  #define TAHVO_REG_IDR          0x01    /* Interrupt ID */
1569  #define TAHVO_REG_IDSR         0x02    /* Interrupt status */
1570  #define TAHVO_REG_IMR          0x03    /* Interrupt mask */
1571 +#define TAHVO_REG_CHGCURR      0x04    /* Charge current control PWM (8-bit) */
1572  #define TAHVO_REG_LEDPWMR      0x05    /* LED PWM */
1573  #define TAHVO_REG_USBR         0x06    /* USB control */
1574 +#define TAHVO_REG_CHGCTL       0x08    /* Charge control register */
1575 +#define  TAHVO_REG_CHGCTL_EN           0x0001  /* Global charge enable */
1576 +#define  TAHVO_REG_CHGCTL_PWMOVR       0x0004  /* PWM override. Force charge PWM to 0%/100% duty cycle. */
1577 +#define  TAHVO_REG_CHGCTL_PWMOVRZERO   0x0008  /* If set, PWM override is 0% (If unset -> 100%) */
1578 +#define  TAHVO_REG_CHGCTL_CURMEAS      0x0040  /* Enable battery current measurement. */
1579 +#define  TAHVO_REG_CHGCTL_CURTIMRST    0x0080  /* Current measure timer reset. */
1580 +#define TAHVO_REG_BATCURRTIMER 0x0c    /* Battery current measure timer (8-bit) */
1581 +#define TAHVO_REG_BATCURR      0x0d    /* Battery (dis)charge current (signed 16-bit) */
1582 +
1583  #define TAHVO_REG_MAX          0x0d
1584
1585  /* Interrupt sources */
1586  #define TAHVO_INT_VBUSON       0
1587 +#define TAHVO_INT_BATCURR      7 /* Battery current measure timer */
1588
1589  #define MAX_TAHVO_IRQ_HANDLERS 8
1590
1591  int tahvo_read_reg(int reg);
1592 -void tahvo_write_reg(int reg, u16 val);
1593 +int tahvo_write_reg(int reg, u16 val);
1594  void tahvo_set_clear_reg_bits(int reg, u16 set, u16 clear);
1595  int tahvo_request_irq(int id, void *irq_handler, unsigned long arg, char *name);
1596  void tahvo_free_irq(int id);
1597 Index: linux-2.6.37/drivers/cbus/tahvo.c
1598 ===================================================================
1599 --- linux-2.6.37.orig/drivers/cbus/tahvo.c      2011-02-06 14:05:49.830387588 +0100
1600 +++ linux-2.6.37/drivers/cbus/tahvo.c   2011-02-06 14:05:49.886395793 +0100
1601 @@ -85,10 +85,10 @@
1602   *
1603   * This function writes a value to the specified register
1604   */
1605 -void tahvo_write_reg(int reg, u16 val)
1606 +int tahvo_write_reg(int reg, u16 val)
1607  {
1608         BUG_ON(!tahvo_initialized);
1609 -       cbus_write_reg(cbus_host, TAHVO_ID, reg, val);
1610 +       return cbus_write_reg(cbus_host, TAHVO_ID, reg, val);
1611  }
1612
1613  /**
1614 Index: linux-2.6.37/drivers/cbus/cbus.c
1615 ===================================================================
1616 --- linux-2.6.37.orig/drivers/cbus/cbus.c       2011-02-08 17:34:34.988926130 +0100
1617 +++ linux-2.6.37/drivers/cbus/cbus.c    2011-02-08 17:38:16.980407594 +0100
1618 @@ -31,6 +31,7 @@
1619  #include <linux/gpio.h>
1620  #include <linux/platform_device.h>
1621  #include <linux/slab.h>
1622 +#include <linux/reboot.h>
1623
1624  #include <asm/io.h>
1625  #include <asm/mach-types.h>
1626 @@ -301,6 +302,13 @@
1627  }
1628  module_exit(cbus_bus_exit);
1629
1630 +void cbus_emergency(void)
1631 +{
1632 +       machine_power_off();
1633 +       panic("cbus: Failed to halt machine in emergency state\n");
1634 +}
1635 +EXPORT_SYMBOL(cbus_emergency);
1636 +
1637  MODULE_DESCRIPTION("CBUS serial protocol");
1638  MODULE_LICENSE("GPL");
1639  MODULE_AUTHOR("Juha Yrjölä");
1640 Index: linux-2.6.37/drivers/cbus/cbus.h
1641 ===================================================================
1642 --- linux-2.6.37.orig/drivers/cbus/cbus.h       2011-02-08 17:36:40.172074049 +0100
1643 +++ linux-2.6.37/drivers/cbus/cbus.h    2011-02-08 17:41:32.680647478 +0100
1644 @@ -33,4 +33,6 @@
1645  extern int cbus_read_reg(struct cbus_host *host, int dev, int reg);
1646  extern int cbus_write_reg(struct cbus_host *host, int dev, int reg, u16 val);
1647
1648 +NORET_TYPE void cbus_emergency(void) ATTRIB_NORET;
1649 +
1650  #endif /* __DRIVERS_CBUS_CBUS_H */