target/linux/omap24xx/patches-2.6.38/900-n810-battery-management.patch

   1 --- a/drivers/cbus/Kconfig
   2 +++ b/drivers/cbus/Kconfig
   3 @@ -72,4 +72,12 @@ config CBUS_RETU_HEADSET
   4           to Retu/Vilma. Detection state and events are exposed through
   5           sysfs.
   6
   7 +config N810BM
   8 +       depends on CBUS_RETU && CBUS_TAHVO
   9 +       tristate "Nokia n810 battery management"
  10 +       ---help---
  11 +         Nokia n810 device battery management.
  12 +
  13 +         If unsure, say N.
  14 +
  15  endmenu
  16 --- a/drivers/cbus/Makefile
  17 +++ b/drivers/cbus/Makefile
  18 @@ -11,3 +11,6 @@ obj-$(CONFIG_CBUS_RETU_POWERBUTTON) += r
  19  obj-$(CONFIG_CBUS_RETU_RTC)    += retu-rtc.o
  20  obj-$(CONFIG_CBUS_RETU_WDT)    += retu-wdt.o
  21  obj-$(CONFIG_CBUS_RETU_HEADSET)        += retu-headset.o
  22 +n810bm-y                       += n810bm_main.o
  23 +n810bm-y                       += lipocharge.o
  24 +obj-$(CONFIG_N810BM)           += n810bm.o
  25 --- /dev/null
  26 +++ b/drivers/cbus/n810bm_main.c
  27 @@ -0,0 +1,1586 @@
  28 +/*
  29 + *   Nokia n810 battery management
  30 + *
  31 + *   WARNING: This driver is based on unconfirmed documentation.
  32 + *            It is possibly dangerous to use this software.
  33 + *            Use this software at your own risk!
  34 + *
  35 + *   Copyright (c) 2010-2011 Michael Buesch <mb@bu3sch.de>
  36 + *
  37 + *   This program is free software; you can redistribute it and/or
  38 + *   modify it under the terms of the GNU General Public License
  39 + *   as published by the Free Software Foundation; either version 2
  40 + *   of the License, or (at your option) any later version.
  41 + *
  42 + *   This program is distributed in the hope that it will be useful,
  43 + *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  44 + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  45 + *   GNU General Public License for more details.
  46 + */
  47 +
  48 +#define DEBUG
  49 +
  50 +#include <linux/module.h>
  51 +#include <linux/device.h>
  52 +#include <linux/platform_device.h>
  53 +#include <linux/slab.h>
  54 +#include <linux/mutex.h>
  55 +#include <linux/timer.h>
  56 +#include <linux/firmware.h>
  57 +#include <linux/bitops.h>
  58 +#include <linux/workqueue.h>
  59 +#include <linux/delay.h>
  60 +
  61 +#include "cbus.h"
  62 +#include "retu.h"
  63 +#include "tahvo.h"
  64 +#include "lipocharge.h"
  65 +
  66 +
  67 +#define N810BM_PMM_BLOCK_FILENAME      "n810-cal-bme-pmm.fw"
  68 +#define N810BM_PMM_BLOCK_SIZE          0x600
  69 +#define N810BM_PMM_GROUP_SIZE          0x200
  70 +#define N810BM_PMM_ELEM_SIZE           0x10
  71 +
  72 +#define N810BM_CHECK_INTERVAL          (HZ * 2)
  73 +#define N810BM_MIN_VOLTAGE_THRES       3200 /* Absolute minimum voltage threshold */
  74 +
  75 +
  76 +/* RETU_ADC_BSI
  77 + * The battery size indicator ADC measures the resistance between
  78 + * the battery BSI pin and ground. This is used to detect the battery
  79 + * capacity, as the BSI resistor is related to capacity.
  80 + *
  81 + * Manually measured lookup table.
  82 + * Hard to measure, thus not very accurate.
  83 + *
  84 + * Resistance  |  ADC value
  85 + * ========================
  86 + * 120k        |  0x3AC
  87 + * 110k        |  0x37C
  88 + * 100k        |  0x351
  89 + *  90k        |  0x329
  90 + */
  91 +
  92 +/* RETU_ADC_BATTVOLT
  93 + * Manually measured lookup table.
  94 + * Hard to measure, thus not very accurate.
  95 + *
  96 + * Voltage  |  ADC value
  97 + * =====================
  98 + * 2.80V    |  0x037
  99 + * 2.90V    |  0x05E
 100 + * 3.00V    |  0x090
 101 + * 3.10V    |  0x0A4
 102 + * 3.20V    |  0x0CC
 103 + * 3.30V    |  0x0EF
 104 + * 3.40V    |  0x115
 105 + * 3.50V    |  0x136
 106 + * 3.60V    |  0x15C
 107 + * 3.70V    |  0x187
 108 + * 3.80V    |  0x1A5
 109 + * 3.90V    |  0x1C9
 110 + * 4.00V    |  0x1ED
 111 + * 4.10V    |  0x212
 112 + * 4.20V    |  0x236
 113 + */
 114 +
 115 +
 116 +/* PMM block ADC IDs */
 117 +enum n810bm_pmm_adc_id {
 118 +       N810BM_PMM_ADC_BATVOLT          = 0x01, /* Battery voltage */
 119 +       N810BM_PMM_ADC_CHGVOLT          = 0x02, /* Charger voltage */
 120 +       N810BM_PMM_ADC_GND2             = 0x03, /* Ground 0V */
 121 +       N810BM_PMM_ADC_BSI              = 0x04, /* Battery size indicator */
 122 +       N810BM_PMM_ADC_BATTEMP          = 0x05, /* Battery temperature */
 123 +       N810BM_PMM_ADC_HEADSET          = 0x06, /* Headset detection */
 124 +       N810BM_PMM_ADC_HOOKDET          = 0x07, /* Hook detection */
 125 +       N810BM_PMM_ADC_LIGHTSENS        = 0x08, /* Light sensor */
 126 +       N810BM_PMM_ADC_BATCURR          = 0x0E, /* Battery current */
 127 +       N810BM_PMM_ADC_BKUPVOLT         = 0x13, /* Backup battery voltage */
 128 +       N810BM_PMM_ADC_LIGHTTEMP        = 0x14, /* Light sensor temperature */
 129 +       N810BM_PMM_ADC_RFGP             = 0x15, /* RF GP */
 130 +       N810BM_PMM_ADC_WBTX             = 0x16, /* Wideband TX detection */
 131 +       N810BM_PMM_ADC_RETUTEMP         = 0x17, /* RETU chip temperature */
 132 +       N810BM_PMM_ADC_0xFE             = 0xFE,
 133 +};
 134 +
 135 +struct n810bm_adc_calib {
 136 +       enum n810bm_pmm_adc_id id;
 137 +       u8 flags;
 138 +       u8 adc_groupnr;
 139 +       u32 field1;
 140 +       u32 field2;
 141 +       u16 field3;
 142 +       u16 field4;
 143 +};
 144 +
 145 +struct n810bm_calib {
 146 +       struct n810bm_adc_calib adc[25];
 147 +};
 148 +
 149 +enum n810bm_capacity {
 150 +       N810BM_CAP_UNKNOWN      = -1,
 151 +       N810BM_CAP_NONE         = 0,
 152 +       N810BM_CAP_1500MAH      = 1500, /* 1500 mAh battery */
 153 +};
 154 +
 155 +enum n810bm_notify_flags {
 156 +       N810BM_NOTIFY_charger_present,
 157 +       N810BM_NOTIFY_charger_state,
 158 +       N810BM_NOTIFY_charger_pwm,
 159 +};
 160 +
 161 +struct n810bm {
 162 +       bool battery_present;                   /* A battery is inserted */
 163 +       bool charger_present;                   /* The charger is connected */
 164 +       enum n810bm_capacity capacity;          /* The capacity of the inserted battery (if any) */
 165 +
 166 +       bool charger_enabled;                   /* Want to charge? */
 167 +       struct lipocharge charger;              /* Charger subsystem */
 168 +       unsigned int active_current_pwm;        /* Active value of TAHVO_REG_CHGCURR */
 169 +       int current_measure_enabled;            /* Current measure enable refcount */
 170 +
 171 +       struct platform_device *pdev;
 172 +       struct n810bm_calib calib;              /* Calibration data */
 173 +
 174 +       bool verbose_charge_log;                /* Verbose charge logging */
 175 +
 176 +       unsigned long notify_flags;
 177 +       struct work_struct notify_work;
 178 +       struct work_struct currmeas_irq_work;
 179 +       struct delayed_work periodic_check_work;
 180 +
 181 +       bool initialized;                       /* The hardware was initialized */
 182 +       struct mutex mutex;
 183 +};
 184 +
 185 +static void n810bm_notify_charger_present(struct n810bm *bm);
 186 +static void n810bm_notify_charger_state(struct n810bm *bm);
 187 +static void n810bm_notify_charger_pwm(struct n810bm *bm);
 188 +
 189 +
 190 +static struct platform_device *n810bm_retu_device;
 191 +static struct platform_device *n810bm_tahvo_device;
 192 +
 193 +
 194 +static inline struct n810bm * device_to_n810bm(struct device *dev)
 195 +{
 196 +       struct platform_device *pdev = to_platform_device(dev);
 197 +       struct n810bm *bm = platform_get_drvdata(pdev);
 198 +
 199 +       return bm;
 200 +}
 201 +
 202 +static inline bool n810bm_known_battery_present(struct n810bm *bm)
 203 +{
 204 +       return bm->battery_present &&
 205 +              bm->capacity != N810BM_CAP_UNKNOWN &&
 206 +              bm->capacity != N810BM_CAP_NONE;
 207 +}
 208 +
 209 +static NORET_TYPE void n810bm_emergency(struct n810bm *bm, const char *message) ATTRIB_NORET;
 210 +static void n810bm_emergency(struct n810bm *bm, const char *message)
 211 +{
 212 +       printk(KERN_EMERG "n810 battery management fatal fault: %s\n", message);
 213 +       cbus_emergency();
 214 +}
 215 +
 216 +static u16 tahvo_read(struct n810bm *bm, unsigned int reg)
 217 +{
 218 +       return tahvo_read_reg(reg);
 219 +}
 220 +
 221 +static void tahvo_maskset(struct n810bm *bm, unsigned int reg, u16 mask, u16 set)
 222 +{
 223 +       tahvo_set_clear_reg_bits(reg, set, mask);
 224 +}
 225 +
 226 +static inline void tahvo_write(struct n810bm *bm, unsigned int reg, u16 value)
 227 +{
 228 +       unsigned long flags;
 229 +
 230 +       spin_lock_irqsave(&tahvo_lock, flags);
 231 +       tahvo_write_reg(reg, value);
 232 +       spin_unlock_irqrestore(&tahvo_lock, flags);
 233 +}
 234 +
 235 +static inline void tahvo_set(struct n810bm *bm, unsigned int reg, u16 mask)
 236 +{
 237 +       tahvo_set_clear_reg_bits(reg, mask, mask);
 238 +}
 239 +
 240 +static inline void tahvo_clear(struct n810bm *bm, unsigned int reg, u16 mask)
 241 +{
 242 +       tahvo_set_clear_reg_bits(reg, 0, mask);
 243 +}
 244 +
 245 +static u16 retu_read(struct n810bm *bm, unsigned int reg)
 246 +{
 247 +       return retu_read_reg(&n810bm_retu_device->dev, reg);
 248 +}
 249 +
 250 +static void retu_maskset(struct n810bm *bm, unsigned int reg, u16 mask, u16 set)
 251 +{
 252 +       retu_set_clear_reg_bits(&n810bm_retu_device->dev, reg, set, mask);
 253 +}
 254 +
 255 +static inline void retu_write(struct n810bm *bm, unsigned int reg, u16 value)
 256 +{
 257 +       retu_write_reg(&n810bm_retu_device->dev, reg, value);
 258 +}
 259 +
 260 +static int retu_adc_average(struct n810bm *bm, unsigned int chan,
 261 +                           unsigned int nr_passes)
 262 +{
 263 +       unsigned int i, value = 0;
 264 +       int ret;
 265 +
 266 +       if (WARN_ON(!nr_passes))
 267 +               return 0;
 268 +       for (i = 0; i < nr_passes; i++) {
 269 +               ret = retu_read_adc(&n810bm_retu_device->dev, chan);
 270 +               if (ret < 0)
 271 +                       return ret;
 272 +               value += ret;
 273 +       }
 274 +       value /= nr_passes;
 275 +
 276 +       return value;
 277 +}
 278 +
 279 +static struct n810bm_adc_calib * n810bm_get_adc_calib(struct n810bm *bm,
 280 +                                               enum n810bm_pmm_adc_id id)
 281 +{
 282 +       unsigned int index = 0;
 283 +       struct n810bm_adc_calib *cal;
 284 +
 285 +       if (id != N810BM_PMM_ADC_0xFE)
 286 +               index = (unsigned int)id + 1;
 287 +       if (index >= ARRAY_SIZE(bm->calib.adc))
 288 +               return NULL;
 289 +
 290 +       cal = &bm->calib.adc[index];
 291 +       WARN_ON(cal->id && cal->id != id);
 292 +
 293 +       return cal;
 294 +}
 295 +
 296 +static int pmm_record_get(struct n810bm *bm,
 297 +                         const struct firmware *pmm_block,
 298 +                         void *buffer, size_t length,
 299 +                         unsigned int group, unsigned int element, unsigned int offset)
 300 +{
 301 +       const u8 *pmm_area = pmm_block->data;
 302 +       u8 active_group_mask;
 303 +
 304 +       if (pmm_block->size != N810BM_PMM_BLOCK_SIZE)
 305 +               return -EINVAL;
 306 +       if (group >= N810BM_PMM_BLOCK_SIZE / N810BM_PMM_GROUP_SIZE)
 307 +               return -EINVAL;
 308 +       if (element >= N810BM_PMM_GROUP_SIZE / N810BM_PMM_ELEM_SIZE)
 309 +               return -EINVAL;
 310 +       if (offset >= N810BM_PMM_ELEM_SIZE || length > N810BM_PMM_ELEM_SIZE ||
 311 +           length + offset > N810BM_PMM_ELEM_SIZE)
 312 +               return -EINVAL;
 313 +
 314 +       active_group_mask = pmm_area[16];
 315 +       if (!(active_group_mask & (1 << group))) {
 316 +               dev_dbg(&bm->pdev->dev, "pwm_record_get: Requested group %u, "
 317 +                       "but group is not active", group);
 318 +               return -ENOENT;
 319 +       }
 320 +
 321 +       memcpy(buffer,
 322 +              pmm_area + group * N810BM_PMM_GROUP_SIZE
 323 +                       + element * N810BM_PMM_ELEM_SIZE
 324 +                       + offset,
 325 +              length);
 326 +
 327 +       return 0;
 328 +}
 329 +
 330 +/* PMM block group 1 element */
 331 +struct group1_element {
 332 +       u8 id;
 333 +       u8 flags;
 334 +       u8 adc_groupnr;
 335 +       u8 _padding;
 336 +       __le32 field1;
 337 +       __le32 field2;
 338 +} __packed;
 339 +
 340 +static int extract_group1_elem(struct n810bm *bm,
 341 +                              const struct firmware *pmm_block,
 342 +                              const enum n810bm_pmm_adc_id *pmm_adc_ids, size_t nr_pmm_adc_ids,
 343 +                              u32 field1_mask, u32 field2_mask)
 344 +{
 345 +       struct group1_element elem;
 346 +       int err;
 347 +       unsigned int i, element_nr;
 348 +       struct n810bm_adc_calib *adc_calib;
 349 +
 350 +       for (i = 0; i < nr_pmm_adc_ids; i++) {
 351 +               element_nr = (unsigned int)(pmm_adc_ids[i]) + 3;
 352 +
 353 +               err = pmm_record_get(bm, pmm_block, &elem, sizeof(elem),
 354 +                                    1, element_nr, 0);
 355 +               if (err)
 356 +                       continue;
 357 +               adc_calib = n810bm_get_adc_calib(bm, elem.id);
 358 +               if (!adc_calib) {
 359 +                       dev_err(&bm->pdev->dev, "extract_group1_elem: "
 360 +                               "Could not get calib element for 0x%02X",
 361 +                               elem.id);
 362 +                       return -EINVAL;
 363 +               }
 364 +
 365 +               if (adc_calib->flags == elem.flags) {
 366 +                       adc_calib->field1 = le32_to_cpu(elem.field1) & field1_mask;
 367 +                       adc_calib->field2 = le32_to_cpu(elem.field2) & field2_mask;
 368 +               } else {
 369 +                       dev_dbg(&bm->pdev->dev, "extract_group1_elem: "
 370 +                               "Not extracting fields due to flags mismatch: "
 371 +                               "0x%02X vs 0x%02X",
 372 +                               adc_calib->flags, elem.flags);
 373 +               }
 374 +       }
 375 +
 376 +       return 0;
 377 +}
 378 +
 379 +static int n810bm_parse_pmm_group1(struct n810bm *bm,
 380 +                                  const struct firmware *pmm_block)
 381 +{
 382 +       struct n810bm_adc_calib *adc_calib;
 383 +       struct group1_element elem;
 384 +       int err;
 385 +
 386 +       static const enum n810bm_pmm_adc_id pmm_adc_ids_1[] = {
 387 +               N810BM_PMM_ADC_BATVOLT,
 388 +               N810BM_PMM_ADC_CHGVOLT,
 389 +               N810BM_PMM_ADC_BKUPVOLT,
 390 +               N810BM_PMM_ADC_BATCURR,
 391 +       };
 392 +       static const enum n810bm_pmm_adc_id pmm_adc_ids_2[] = {
 393 +               N810BM_PMM_ADC_BSI,
 394 +       };
 395 +       static const enum n810bm_pmm_adc_id pmm_adc_ids_3[] = {
 396 +               N810BM_PMM_ADC_BATTEMP,
 397 +       };
 398 +
 399 +       /* Parse element 2 */
 400 +       err = pmm_record_get(bm, pmm_block, &elem, sizeof(elem),
 401 +                            1, 2, 0);
 402 +       if (err) {
 403 +               dev_err(&bm->pdev->dev,
 404 +                       "PMM: Failed to get group 1 / element 2");
 405 +               return err;
 406 +       }
 407 +       if (elem.id == N810BM_PMM_ADC_0xFE && elem.flags == 0x05) {
 408 +               adc_calib = n810bm_get_adc_calib(bm, elem.id);
 409 +               if (!adc_calib) {
 410 +                       dev_err(&bm->pdev->dev,
 411 +                               "calib extract: Failed to get 0xFE calib");
 412 +                       return -EINVAL;
 413 +               }
 414 +               adc_calib->id = elem.id;
 415 +               adc_calib->flags = elem.flags;
 416 +               adc_calib->field1 = le32_to_cpu(elem.field1);
 417 +               adc_calib->field2 = le32_to_cpu(elem.field2);
 418 +       }
 419 +
 420 +       err = extract_group1_elem(bm, pmm_block,
 421 +                                 pmm_adc_ids_1, ARRAY_SIZE(pmm_adc_ids_1),
 422 +                                 0xFFFFFFFF, 0xFFFFFFFF);
 423 +       if (err)
 424 +               return err;
 425 +       err = extract_group1_elem(bm, pmm_block,
 426 +                                 pmm_adc_ids_2, ARRAY_SIZE(pmm_adc_ids_2),
 427 +                                 0xFFFFFFFF, 0);
 428 +       if (err)
 429 +               return err;
 430 +       err = extract_group1_elem(bm, pmm_block,
 431 +                                 pmm_adc_ids_3, ARRAY_SIZE(pmm_adc_ids_3),
 432 +                                 0xFFFFFFFF, 0x0000FFFF);
 433 +       if (err)
 434 +               return err;
 435 +
 436 +       return 0;
 437 +}
 438 +
 439 +static int n810bm_parse_pmm_group2(struct n810bm *bm,
 440 +                                  const struct firmware *pmm_block)
 441 +{
 442 +       dev_err(&bm->pdev->dev, "TODO: CAL BME PMM group 2 parser not implemented, yet");
 443 +       return -EOPNOTSUPP;
 444 +}
 445 +
 446 +static void n810bm_adc_calib_set_defaults(struct n810bm *bm)
 447 +{
 448 +       struct n810bm_adc_calib *adc_calib;
 449 +       unsigned int i;
 450 +
 451 +       static const struct n810bm_adc_calib defaults[] = {
 452 +               /* ADC group-nr 0 */
 453 +               {
 454 +                       .id             = N810BM_PMM_ADC_HEADSET,
 455 +                       .flags          = 0x00,
 456 +                       .adc_groupnr    = 0,
 457 +               }, {
 458 +                       .id             = N810BM_PMM_ADC_HOOKDET,
 459 +                       .flags          = 0x00,
 460 +                       .adc_groupnr    = 0,
 461 +               }, {
 462 +                       .id             = N810BM_PMM_ADC_RFGP,
 463 +                       .flags          = 0x00,
 464 +                       .adc_groupnr    = 0,
 465 +               }, {
 466 +                       .id             = N810BM_PMM_ADC_LIGHTSENS,
 467 +                       .flags          = 0x00,
 468 +                       .adc_groupnr    = 0,
 469 +               }, {
 470 +                       .id             = N810BM_PMM_ADC_WBTX,
 471 +                       .flags          = 0x00,
 472 +                       .adc_groupnr    = 0,
 473 +               }, {
 474 +                       .id             = N810BM_PMM_ADC_RETUTEMP,
 475 +                       .flags          = 0x00,
 476 +                       .adc_groupnr    = 0,
 477 +               }, {
 478 +                       .id             = N810BM_PMM_ADC_GND2,
 479 +                       .flags          = 0x00,
 480 +                       .adc_groupnr    = 0,
 481 +               },
 482 +               /* ADC group-nr 1 */
 483 +               {
 484 +                       .id             = N810BM_PMM_ADC_0xFE,
 485 +                       .flags          = 0x05,
 486 +                       .adc_groupnr    = 1,
 487 +                       .field1         = (u32)-2,
 488 +                       .field2         = 13189,
 489 +               }, {
 490 +                       .id             = N810BM_PMM_ADC_BATVOLT,
 491 +                       .flags          = 0x01,
 492 +                       .adc_groupnr    = 1,
 493 +                       .field1         = 2527,
 494 +                       .field2         = 21373,
 495 +               }, {
 496 +                       .id             = N810BM_PMM_ADC_CHGVOLT,
 497 +                       .flags          = 0x01,
 498 +                       .adc_groupnr    = 1,
 499 +                       .field1         = 0,
 500 +                       .field2         = 129848,
 501 +               }, {
 502 +                       .id             = N810BM_PMM_ADC_BKUPVOLT,
 503 +                       .flags          = 0x01,
 504 +                       .adc_groupnr    = 1,
 505 +                       .field1         = 0,
 506 +                       .field2         = 20000,
 507 +               }, {
 508 +                       .id             = N810BM_PMM_ADC_BATCURR,
 509 +                       .flags          = 0x06,
 510 +                       .adc_groupnr    = 1,
 511 +                       .field1         = 0,
 512 +                       .field2         = 9660,
 513 +               },
 514 +               /* ADC group-nr 2 */
 515 +               {
 516 +                       .id             = N810BM_PMM_ADC_BSI,
 517 +                       .flags          = 0x02,
 518 +                       .adc_groupnr    = 2,
 519 +                       .field1         = 1169,
 520 +                       .field2         = 0,
 521 +               },
 522 +               /* ADC group-nr 3 */
 523 +               {
 524 +                       .id             = N810BM_PMM_ADC_BATTEMP,
 525 +                       .flags          = 0x03,
 526 +                       .adc_groupnr    = 3,
 527 +                       .field1         = 265423000,
 528 +                       .field2         = 298,
 529 +               },
 530 +               /* ADC group-nr 4 */
 531 +               {
 532 +                       .id             = N810BM_PMM_ADC_LIGHTTEMP,
 533 +                       .flags          = 0x04,
 534 +                       .adc_groupnr    = 4,
 535 +                       .field1         = 19533778,
 536 +                       .field2         = 308019670,
 537 +                       .field3         = 4700,
 538 +                       .field4         = 2500,
 539 +               },
 540 +       };
 541 +
 542 +       /* Clear the array */
 543 +       memset(&bm->calib.adc, 0, sizeof(bm->calib.adc));
 544 +       for (i = 0; i < ARRAY_SIZE(bm->calib.adc); i++)
 545 +               bm->calib.adc[i].flags = 0xFF;
 546 +
 547 +       /* Copy the defaults */
 548 +       for (i = 0; i < ARRAY_SIZE(defaults); i++) {
 549 +               adc_calib = n810bm_get_adc_calib(bm, defaults[i].id);
 550 +               if (WARN_ON(!adc_calib))
 551 +                       continue;
 552 +               *adc_calib = defaults[i];
 553 +       }
 554 +}
 555 +
 556 +static int n810bm_parse_pmm_block(struct n810bm *bm,
 557 +                                 const struct firmware *pmm_block)
 558 +{
 559 +       u8 byte;
 560 +       int err;
 561 +       unsigned int i, count;
 562 +       struct n810bm_adc_calib *adc_calib;
 563 +
 564 +       /* Initialize to defaults */
 565 +       n810bm_adc_calib_set_defaults(bm);
 566 +
 567 +       /* Parse the PMM data */
 568 +       err = pmm_record_get(bm, pmm_block, &byte, sizeof(byte),
 569 +                            1, 0, 0); /* group 1 / element 0 */
 570 +       err |= (byte != 0x01);
 571 +       err |= pmm_record_get(bm, pmm_block, &byte, sizeof(byte),
 572 +                             1, 1, 0); /* group 1 / element 1 */
 573 +       err |= (byte != 0x01);
 574 +       if (err)
 575 +               err = n810bm_parse_pmm_group2(bm, pmm_block);
 576 +       else
 577 +               err = n810bm_parse_pmm_group1(bm, pmm_block);
 578 +       if (err)
 579 +               return err;
 580 +
 581 +       /* Sanity checks */
 582 +       for (i = 0, count = 0; i < ARRAY_SIZE(bm->calib.adc); i++) {
 583 +               adc_calib = &bm->calib.adc[i];
 584 +               if (adc_calib->flags == 0xFF)
 585 +                       continue;
 586 +               switch (adc_calib->id) {
 587 +               case N810BM_PMM_ADC_BATVOLT:
 588 +                       if (adc_calib->field1 < 2400 ||
 589 +                           adc_calib->field1 > 2700)
 590 +                               goto value_check_fail;
 591 +                       if (adc_calib->field2 < 20000 ||
 592 +                           adc_calib->field2 > 23000)
 593 +                               goto value_check_fail;
 594 +                       count++;
 595 +                       break;
 596 +               case N810BM_PMM_ADC_BSI:
 597 +                       if (adc_calib->field1 < 1100 ||
 598 +                           adc_calib->field1 > 1300)
 599 +                               goto value_check_fail;
 600 +                       count++;
 601 +                       break;
 602 +               case N810BM_PMM_ADC_BATCURR:
 603 +                       if (adc_calib->field2 < 7000 ||
 604 +                           adc_calib->field2 > 12000)
 605 +                               goto value_check_fail;
 606 +                       count++;
 607 +                       break;
 608 +               case N810BM_PMM_ADC_0xFE:
 609 +                       if ((s32)adc_calib->field1 > 14 ||
 610 +                           (s32)adc_calib->field1 < -14)
 611 +                               goto value_check_fail;
 612 +                       if (adc_calib->field2 < 13000 ||
 613 +                           adc_calib->field2 > 13350)
 614 +                               goto value_check_fail;
 615 +                       count++;
 616 +                       break;
 617 +               case N810BM_PMM_ADC_CHGVOLT:
 618 +               case N810BM_PMM_ADC_BATTEMP:
 619 +               case N810BM_PMM_ADC_BKUPVOLT:
 620 +                       count++;
 621 +                       break;
 622 +               case N810BM_PMM_ADC_GND2:
 623 +               case N810BM_PMM_ADC_HOOKDET:
 624 +               case N810BM_PMM_ADC_LIGHTSENS:
 625 +               case N810BM_PMM_ADC_HEADSET:
 626 +               case N810BM_PMM_ADC_LIGHTTEMP:
 627 +               case N810BM_PMM_ADC_RFGP:
 628 +               case N810BM_PMM_ADC_WBTX:
 629 +               case N810BM_PMM_ADC_RETUTEMP:
 630 +                       break;
 631 +               }
 632 +               dev_dbg(&bm->pdev->dev,
 633 +                       "ADC 0x%02X calib: 0x%02X 0x%02X 0x%08X 0x%08X 0x%04X 0x%04X",
 634 +                       adc_calib->id, adc_calib->flags, adc_calib->adc_groupnr,
 635 +                       adc_calib->field1, adc_calib->field2,
 636 +                       adc_calib->field3, adc_calib->field4);
 637 +       }
 638 +       if (count != 7) {
 639 +               dev_err(&bm->pdev->dev, "PMM sanity check: Did not find "
 640 +                       "all required values (count=%u)", count);
 641 +               goto check_fail;
 642 +       }
 643 +
 644 +       return 0;
 645 +
 646 +value_check_fail:
 647 +       dev_err(&bm->pdev->dev, "PMM image sanity check failed "
 648 +               "(id=%02X, field1=%08X, field2=%08X)",
 649 +               adc_calib->id, adc_calib->field1, adc_calib->field2);
 650 +check_fail:
 651 +       return -EILSEQ;
 652 +}
 653 +
 654 +/* Set the current measure timer that triggers on Tahvo IRQ 7
 655 + * An interval of zero disables the timer. */
 656 +static void n810bm_set_current_measure_timer(struct n810bm *bm,
 657 +                                            u16 millisec_interval)
 658 +{
 659 +       u16 value = millisec_interval;
 660 +
 661 +       if (value <= 0xF905) {
 662 +               value = ((u64)0x10624DD3 * (u64)(value + 0xF9)) >> 32;
 663 +               value /= 16;
 664 +       } else
 665 +               value = 0xFF;
 666 +
 667 +       tahvo_write(bm, TAHVO_REG_BATCURRTIMER, value & 0xFF);
 668 +
 669 +       tahvo_set(bm, TAHVO_REG_CHGCTL,
 670 +                 TAHVO_REG_CHGCTL_CURTIMRST);
 671 +       tahvo_clear(bm, TAHVO_REG_CHGCTL,
 672 +                   TAHVO_REG_CHGCTL_CURTIMRST);
 673 +
 674 +       if (millisec_interval)
 675 +               tahvo_enable_irq(TAHVO_INT_BATCURR);
 676 +       else
 677 +               tahvo_disable_irq(TAHVO_INT_BATCURR);
 678 +
 679 +       //TODO also do a software timer for safety.
 680 +}
 681 +
 682 +static void n810bm_enable_current_measure(struct n810bm *bm)
 683 +{
 684 +       WARN_ON(bm->current_measure_enabled < 0);
 685 +       if (!bm->current_measure_enabled) {
 686 +               /* Enable the current measurement circuitry */
 687 +               tahvo_set(bm, TAHVO_REG_CHGCTL,
 688 +                         TAHVO_REG_CHGCTL_CURMEAS);
 689 +               dev_dbg(&bm->pdev->dev,
 690 +                       "Current measurement circuitry enabled");
 691 +       }
 692 +       bm->current_measure_enabled++;
 693 +}
 694 +
 695 +static void n810bm_disable_current_measure(struct n810bm *bm)
 696 +{
 697 +       bm->current_measure_enabled--;
 698 +       WARN_ON(bm->current_measure_enabled < 0);
 699 +       if (!bm->current_measure_enabled) {
 700 +               /* Disable the current measurement circuitry */
 701 +               tahvo_clear(bm, TAHVO_REG_CHGCTL,
 702 +                           TAHVO_REG_CHGCTL_CURMEAS);
 703 +               dev_dbg(&bm->pdev->dev,
 704 +                       "Current measurement circuitry disabled");
 705 +       }
 706 +}
 707 +
 708 +/* Measure the actual battery current. Returns a signed value in mA.
 709 + * Does only work, if current measurement was enabled. */
 710 +static int n810bm_measure_batt_current(struct n810bm *bm)
 711 +{
 712 +       u16 retval;
 713 +       int adc = 0, ma, i;
 714 +
 715 +       if (WARN_ON(bm->current_measure_enabled <= 0))
 716 +               return 0;
 717 +       for (i = 0; i < 3; i++) {
 718 +               retval = tahvo_read(bm, TAHVO_REG_BATCURR);
 719 +               adc += (s16)retval; /* Value is signed */
 720 +       }
 721 +       adc /= 3;
 722 +
 723 +       //TODO convert to mA
 724 +       ma = adc;
 725 +
 726 +       return ma;
 727 +}
 728 +
 729 +/* Requires bm->mutex locked */
 730 +static int n810bm_measure_batt_current_async(struct n810bm *bm)
 731 +{
 732 +       int ma;
 733 +       bool charging = lipocharge_is_charging(&bm->charger);
 734 +
 735 +       n810bm_enable_current_measure(bm);
 736 +       if (!charging)
 737 +               WARN_ON(bm->active_current_pwm != 0);
 738 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
 739 +                     TAHVO_REG_CHGCTL_EN |
 740 +                     TAHVO_REG_CHGCTL_PWMOVR |
 741 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
 742 +                     TAHVO_REG_CHGCTL_EN |
 743 +                     TAHVO_REG_CHGCTL_PWMOVR |
 744 +                     (charging ? 0 : TAHVO_REG_CHGCTL_PWMOVRZERO));
 745 +       ma = n810bm_measure_batt_current(bm);
 746 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
 747 +                     TAHVO_REG_CHGCTL_EN |
 748 +                     TAHVO_REG_CHGCTL_PWMOVR |
 749 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
 750 +                     (charging ? TAHVO_REG_CHGCTL_EN : 0));
 751 +       n810bm_disable_current_measure(bm);
 752 +
 753 +       return ma;
 754 +}
 755 +
 756 +static int adc_sanity_check(struct n810bm *bm, unsigned int channel)
 757 +{
 758 +       int value;
 759 +
 760 +       value = retu_read_adc(&n810bm_retu_device->dev, channel);
 761 +       if (value < 0) {
 762 +               dev_err(&bm->pdev->dev, "Failed to read GND ADC channel %u",
 763 +                       channel);
 764 +               return -EIO;
 765 +       }
 766 +       dev_dbg(&bm->pdev->dev,
 767 +               "GND ADC channel %u sanity check got value: %d",
 768 +               channel, value);
 769 +       if (value > 5) {
 770 +               n810bm_emergency(bm, "GND ADC sanity check failed");
 771 +               return -EIO;
 772 +       }
 773 +
 774 +       return 0;
 775 +}
 776 +
 777 +static int n810bm_check_adc_sanity(struct n810bm *bm)
 778 +{
 779 +       int err;
 780 +
 781 +       /* Discard one conversion */
 782 +       retu_write(bm, RETU_REG_ADCSCR, 0);
 783 +       retu_read_adc(&n810bm_retu_device->dev, RETU_ADC_GND2);
 784 +
 785 +       err = adc_sanity_check(bm, RETU_ADC_GND2);
 786 +       if (err)
 787 +               return err;
 788 +
 789 +       return 0;
 790 +}
 791 +
 792 +/* Measure the battery voltage. Returns the value in mV (or negative value on error). */
 793 +static int n810bm_measure_batt_voltage(struct n810bm *bm)
 794 +{
 795 +       int adc;
 796 +       unsigned int mv;
 797 +       const unsigned int scale = 1000;
 798 +
 799 +       adc = retu_adc_average(bm, RETU_ADC_BATTVOLT, 5);
 800 +       if (adc < 0)
 801 +               return adc;
 802 +       if (adc <= 0x37)
 803 +               return 2800;
 804 +       mv = 2800 + ((adc - 0x37) * (((4200 - 2800) * scale) / (0x236 - 0x37))) / scale;
 805 +
 806 +       //TODO compensate for power consumption
 807 +       //TODO honor calibration values
 808 +
 809 +       return mv;
 810 +}
 811 +
 812 +/* Measure the charger voltage. Returns the value in mV (or negative value on error). */
 813 +static int n810bm_measure_charger_voltage(struct n810bm *bm)
 814 +{
 815 +       int adc;
 816 +       unsigned int mv;
 817 +
 818 +       adc = retu_adc_average(bm, RETU_ADC_CHGVOLT, 5);
 819 +       if (adc < 0)
 820 +               return adc;
 821 +       //TODO convert to mV
 822 +       mv = adc;
 823 +
 824 +       return mv;
 825 +}
 826 +
 827 +/* Measure backup battery voltage. Returns the value in mV (or negative value on error). */
 828 +static int n810bm_measure_backup_batt_voltage(struct n810bm *bm)
 829 +{
 830 +       int adc;
 831 +       unsigned int mv;
 832 +
 833 +       adc = retu_adc_average(bm, RETU_ADC_BKUPVOLT, 3);
 834 +       if (adc < 0)
 835 +               return adc;
 836 +       //TODO convert to mV
 837 +       mv = adc;
 838 +
 839 +       return mv;
 840 +}
 841 +
 842 +/* Measure the battery temperature. Returns the value in K (or negative value on error). */
 843 +static int n810bm_measure_batt_temp(struct n810bm *bm)
 844 +{
 845 +       int adc;
 846 +       unsigned int k;
 847 +
 848 +       adc = retu_adc_average(bm, RETU_ADC_BATTEMP, 3);
 849 +       if (adc < 0)
 850 +               return adc;
 851 +       //TODO convert to K
 852 +       k = adc;
 853 +
 854 +       return k;
 855 +}
 856 +
 857 +/* Read the battery capacity via BSI pin. */
 858 +static enum n810bm_capacity n810bm_read_batt_capacity(struct n810bm *bm)
 859 +{
 860 +       int adc;
 861 +       const unsigned int hyst = 20;
 862 +
 863 +       adc = retu_adc_average(bm, RETU_ADC_BSI, 5);
 864 +       if (adc < 0) {
 865 +               dev_err(&bm->pdev->dev, "Failed to read BSI ADC");
 866 +               return N810BM_CAP_UNKNOWN;
 867 +       }
 868 +
 869 +       if (adc >= 0x3B5 - hyst && adc <= 0x3B5 + hyst)
 870 +               return N810BM_CAP_1500MAH;
 871 +
 872 +       dev_err(&bm->pdev->dev, "Capacity indicator 0x%X unknown", adc);
 873 +
 874 +       return N810BM_CAP_UNKNOWN;
 875 +}
 876 +
 877 +/* Convert a battery voltage (in mV) to percentage. */
 878 +static unsigned int n810bm_mvolt2percent(unsigned int mv)
 879 +{
 880 +       const unsigned int minv = 3700;
 881 +       const unsigned int maxv = 4150;
 882 +       unsigned int percent;
 883 +
 884 +       mv = clamp(mv, minv, maxv);
 885 +       percent = (mv - minv) * 100 / (maxv - minv);
 886 +
 887 +       return percent;
 888 +}
 889 +
 890 +static void n810bm_start_charge(struct n810bm *bm)
 891 +{
 892 +       int err;
 893 +
 894 +       WARN_ON(!bm->battery_present);
 895 +       WARN_ON(!bm->charger_present);
 896 +
 897 +       /* Set PWM to zero */
 898 +       bm->active_current_pwm = 0;
 899 +       tahvo_write(bm, TAHVO_REG_CHGCURR, bm->active_current_pwm);
 900 +
 901 +       /* Charge global enable */
 902 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
 903 +                     TAHVO_REG_CHGCTL_EN |
 904 +                     TAHVO_REG_CHGCTL_PWMOVR |
 905 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
 906 +                     TAHVO_REG_CHGCTL_EN);
 907 +
 908 +       WARN_ON((int)bm->capacity <= 0);
 909 +       bm->charger.capacity = bm->capacity;
 910 +       err = lipocharge_start(&bm->charger);
 911 +       WARN_ON(err);
 912 +
 913 +       /* Initialize current measurement circuitry */
 914 +       n810bm_enable_current_measure(bm);
 915 +       n810bm_set_current_measure_timer(bm, 250);
 916 +
 917 +       dev_info(&bm->pdev->dev, "Charging battery");
 918 +       n810bm_notify_charger_state(bm);
 919 +       n810bm_notify_charger_pwm(bm);
 920 +}
 921 +
 922 +static void n810bm_stop_charge(struct n810bm *bm)
 923 +{
 924 +       if (lipocharge_is_charging(&bm->charger)) {
 925 +               n810bm_set_current_measure_timer(bm, 0);
 926 +               n810bm_disable_current_measure(bm);
 927 +       }
 928 +       lipocharge_stop(&bm->charger);
 929 +
 930 +       /* Set PWM to zero */
 931 +       bm->active_current_pwm = 0;
 932 +       tahvo_write(bm, TAHVO_REG_CHGCURR, bm->active_current_pwm);
 933 +
 934 +       /* Charge global disable */
 935 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
 936 +                     TAHVO_REG_CHGCTL_EN |
 937 +                     TAHVO_REG_CHGCTL_PWMOVR |
 938 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
 939 +                     0);
 940 +
 941 +       dev_info(&bm->pdev->dev, "Not charging battery");
 942 +       n810bm_notify_charger_state(bm);
 943 +       n810bm_notify_charger_pwm(bm);
 944 +}
 945 +
 946 +/* Periodic check */
 947 +static void n810bm_periodic_check_work(struct work_struct *work)
 948 +{
 949 +       struct n810bm *bm = container_of(to_delayed_work(work),
 950 +                                        struct n810bm, periodic_check_work);
 951 +       u16 status;
 952 +       bool battery_was_present, charger_was_present;
 953 +       int mv;
 954 +
 955 +       mutex_lock(&bm->mutex);
 956 +
 957 +       status = retu_read(bm, RETU_REG_STATUS);
 958 +       battery_was_present = bm->battery_present;
 959 +       charger_was_present = bm->charger_present;
 960 +       bm->battery_present = !!(status & RETU_REG_STATUS_BATAVAIL);
 961 +       bm->charger_present = !!(status & RETU_REG_STATUS_CHGPLUG);
 962 +
 963 +       if (bm->battery_present != battery_was_present) {
 964 +               /* Battery state changed */
 965 +               if (bm->battery_present) {
 966 +                       bm->capacity = n810bm_read_batt_capacity(bm);
 967 +                       if (bm->capacity == N810BM_CAP_UNKNOWN) {
 968 +                               dev_err(&bm->pdev->dev, "Unknown battery detected");
 969 +                       } else {
 970 +                               dev_info(&bm->pdev->dev, "Detected %u mAh battery",
 971 +                                        (unsigned int)bm->capacity);
 972 +                       }
 973 +               } else {
 974 +                       bm->capacity = N810BM_CAP_NONE;
 975 +                       dev_info(&bm->pdev->dev, "The main battery was removed");
 976 +                       //TODO disable charging
 977 +               }
 978 +       }
 979 +
 980 +       if (bm->charger_present != charger_was_present) {
 981 +               /* Charger state changed */
 982 +               dev_info(&bm->pdev->dev, "The charger was %s",
 983 +                        bm->charger_present ? "plugged in" : "removed");
 984 +               n810bm_notify_charger_present(bm);
 985 +       }
 986 +
 987 +       if ((bm->battery_present && !bm->charger_present) ||
 988 +           !n810bm_known_battery_present(bm)){
 989 +               /* We're draining the battery */
 990 +               mv = n810bm_measure_batt_voltage(bm);
 991 +               if (mv < 0) {
 992 +                       n810bm_emergency(bm,
 993 +                               "check: Failed to measure voltage");
 994 +               }
 995 +               if (mv < N810BM_MIN_VOLTAGE_THRES) {
 996 +                       n810bm_emergency(bm,
 997 +                               "check: Minimum voltage threshold reached");
 998 +               }
 999 +       }
1000 +
1001 +       if (bm->charger_present && n810bm_known_battery_present(bm)) {
1002 +               /* Known battery and charger are connected */
1003 +               if (bm->charger_enabled) {
1004 +                       /* Charger is enabled */
1005 +                       if (!lipocharge_is_charging(&bm->charger)) {
1006 +                               //TODO start charging, if battery is below some threshold
1007 +                               n810bm_start_charge(bm);
1008 +                       }
1009 +               }
1010 +       }
1011 +
1012 +       if (lipocharge_is_charging(&bm->charger) && !bm->charger_present) {
1013 +               /* Charger was unplugged. */
1014 +               n810bm_stop_charge(bm);
1015 +       }
1016 +
1017 +       mutex_unlock(&bm->mutex);
1018 +       schedule_delayed_work(&bm->periodic_check_work,
1019 +                             round_jiffies_relative(N810BM_CHECK_INTERVAL));
1020 +}
1021 +
1022 +/*XXX
1023 +static void n810bm_adc_irq_handler(unsigned long data)
1024 +{
1025 +       struct n810bm *bm = (struct n810bm *)data;
1026 +
1027 +       retu_ack_irq(RETU_INT_ADCS);
1028 +       //TODO
1029 +dev_info(&bm->pdev->dev, "ADC interrupt triggered\n");
1030 +}
1031 +*/
1032 +
1033 +static void n810bm_tahvo_current_measure_work(struct work_struct *work)
1034 +{
1035 +       struct n810bm *bm = container_of(work, struct n810bm, currmeas_irq_work);
1036 +       int res, ma, mv, temp;
1037 +
1038 +       mutex_lock(&bm->mutex);
1039 +       if (!lipocharge_is_charging(&bm->charger))
1040 +               goto out_unlock;
1041 +
1042 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
1043 +                     TAHVO_REG_CHGCTL_PWMOVR |
1044 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
1045 +                     TAHVO_REG_CHGCTL_PWMOVR);
1046 +       ma = n810bm_measure_batt_current(bm);
1047 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
1048 +                     TAHVO_REG_CHGCTL_PWMOVR |
1049 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
1050 +                     TAHVO_REG_CHGCTL_PWMOVR |
1051 +                     TAHVO_REG_CHGCTL_PWMOVRZERO);
1052 +       msleep(10);
1053 +       mv = n810bm_measure_batt_voltage(bm);
1054 +       tahvo_maskset(bm, TAHVO_REG_CHGCTL,
1055 +                     TAHVO_REG_CHGCTL_PWMOVR |
1056 +                     TAHVO_REG_CHGCTL_PWMOVRZERO,
1057 +                     0);
1058 +       temp = n810bm_measure_batt_temp(bm);
1059 +       if (WARN_ON(mv < 0))
1060 +               goto out_unlock;
1061 +       if (WARN_ON(temp < 0))
1062 +               goto out_unlock;
1063 +
1064 +       if (bm->verbose_charge_log) {
1065 +               dev_info(&bm->pdev->dev,
1066 +                        "Battery charge state: %d mV, %d mA (%s)",
1067 +                        mv, ma,
1068 +                        (ma <= 0) ? "discharging" : "charging");
1069 +       }
1070 +       res = lipocharge_update_state(&bm->charger, mv, ma, temp);
1071 +       if (res) {
1072 +               if (res > 0)
1073 +                       dev_info(&bm->pdev->dev, "Battery fully charged");
1074 +               n810bm_stop_charge(bm);
1075 +       }
1076 +out_unlock:
1077 +       mutex_unlock(&bm->mutex);
1078 +}
1079 +
1080 +static void n810bm_tahvo_current_measure_irq_handler(unsigned long data)
1081 +{
1082 +       struct n810bm *bm = (struct n810bm *)data;
1083 +
1084 +       tahvo_ack_irq(TAHVO_INT_BATCURR);
1085 +       schedule_work(&bm->currmeas_irq_work);
1086 +}
1087 +
1088 +#define DEFINE_ATTR_NOTIFY(attr_name)                                          \
1089 +       void n810bm_notify_##attr_name(struct n810bm *bm)                       \
1090 +       {                                                                       \
1091 +               set_bit(N810BM_NOTIFY_##attr_name, &bm->notify_flags);          \
1092 +               wmb();                                                          \
1093 +               schedule_work(&bm->notify_work);                                \
1094 +       }
1095 +
1096 +#define DEFINE_SHOW_INT_FUNC(name, member)                                     \
1097 +       static ssize_t n810bm_attr_##name##_show(struct device *dev,            \
1098 +                                                struct device_attribute *attr, \
1099 +                                                char *buf)                     \
1100 +       {                                                                       \
1101 +               struct n810bm *bm = device_to_n810bm(dev);                      \
1102 +               ssize_t count;                                                  \
1103 +                                                                               \
1104 +               mutex_lock(&bm->mutex);                                         \
1105 +               count = snprintf(buf, PAGE_SIZE, "%d\n", (int)(bm->member));    \
1106 +               mutex_unlock(&bm->mutex);                                       \
1107 +                                                                               \
1108 +               return count;                                                   \
1109 +       }
1110 +
1111 +#define DEFINE_STORE_INT_FUNC(name, member)                                    \
1112 +       static ssize_t n810bm_attr_##name##_store(struct device *dev,           \
1113 +                                                 struct device_attribute *attr,\
1114 +                                                 const char *buf, size_t count)\
1115 +       {                                                                       \
1116 +               struct n810bm *bm = device_to_n810bm(dev);                      \
1117 +               long val;                                                       \
1118 +               int err;                                                        \
1119 +                                                                               \
1120 +               mutex_lock(&bm->mutex);                                         \
1121 +               err = strict_strtol(buf, 0, &val);                              \
1122 +               if (!err)                                                       \
1123 +                       bm->member = (typeof(bm->member))val;                   \
1124 +               mutex_unlock(&bm->mutex);                                       \
1125 +                                                                               \
1126 +               return err ? err : count;                                       \
1127 +       }
1128 +
1129 +#define DEFINE_ATTR_SHOW_INT(name, member)                                     \
1130 +       DEFINE_SHOW_INT_FUNC(name, member)                                      \
1131 +       static DEVICE_ATTR(name, S_IRUGO,                                       \
1132 +                          n810bm_attr_##name##_show, NULL);
1133 +
1134 +#define DEFINE_ATTR_SHOW_STORE_INT(name, member)                               \
1135 +       DEFINE_SHOW_INT_FUNC(name, member)                                      \
1136 +       DEFINE_STORE_INT_FUNC(name, member)                                     \
1137 +       static DEVICE_ATTR(name, S_IRUGO | S_IWUSR,                             \
1138 +                          n810bm_attr_##name##_show,                           \
1139 +                          n810bm_attr_##name##_store);
1140 +
1141 +DEFINE_ATTR_SHOW_INT(battery_present, battery_present);
1142 +DEFINE_ATTR_SHOW_INT(charger_present, charger_present);
1143 +static DEFINE_ATTR_NOTIFY(charger_present);
1144 +DEFINE_ATTR_SHOW_INT(charger_state, charger.state);
1145 +static DEFINE_ATTR_NOTIFY(charger_state);
1146 +DEFINE_ATTR_SHOW_INT(charger_pwm, active_current_pwm);
1147 +static DEFINE_ATTR_NOTIFY(charger_pwm);
1148 +DEFINE_ATTR_SHOW_STORE_INT(charger_enable, charger_enabled);
1149 +DEFINE_ATTR_SHOW_STORE_INT(charger_verbose, verbose_charge_log);
1150 +
1151 +static ssize_t n810bm_attr_battery_level_show(struct device *dev,
1152 +                                             struct device_attribute *attr,
1153 +                                             char *buf)
1154 +{
1155 +       struct n810bm *bm = device_to_n810bm(dev);
1156 +       ssize_t count = -ENODEV;
1157 +       int millivolt;
1158 +
1159 +       mutex_lock(&bm->mutex);
1160 +       if (!bm->battery_present || lipocharge_is_charging(&bm->charger))
1161 +               millivolt = 0;
1162 +       else
1163 +               millivolt = n810bm_measure_batt_voltage(bm);
1164 +       if (millivolt >= 0) {
1165 +               count = snprintf(buf, PAGE_SIZE, "%u\n",
1166 +                                n810bm_mvolt2percent(millivolt));
1167 +       }
1168 +       mutex_unlock(&bm->mutex);
1169 +
1170 +       return count;
1171 +}
1172 +static DEVICE_ATTR(battery_level, S_IRUGO,
1173 +                  n810bm_attr_battery_level_show, NULL);
1174 +
1175 +static ssize_t n810bm_attr_battery_capacity_show(struct device *dev,
1176 +                                                struct device_attribute *attr,
1177 +                                                char *buf)
1178 +{
1179 +       struct n810bm *bm = device_to_n810bm(dev);
1180 +       ssize_t count;
1181 +       int capacity = 0;
1182 +
1183 +       mutex_lock(&bm->mutex);
1184 +       if (n810bm_known_battery_present(bm))
1185 +               capacity = (int)bm->capacity;
1186 +       count = snprintf(buf, PAGE_SIZE, "%d\n", capacity);
1187 +       mutex_unlock(&bm->mutex);
1188 +
1189 +       return count;
1190 +}
1191 +static DEVICE_ATTR(battery_capacity, S_IRUGO,
1192 +                  n810bm_attr_battery_capacity_show, NULL);
1193 +
1194 +static ssize_t n810bm_attr_battery_temp_show(struct device *dev,
1195 +                                            struct device_attribute *attr,
1196 +                                            char *buf)
1197 +{
1198 +       struct n810bm *bm = device_to_n810bm(dev);
1199 +       ssize_t count = -ENODEV;
1200 +       int k;
1201 +
1202 +       mutex_lock(&bm->mutex);
1203 +       k = n810bm_measure_batt_temp(bm);
1204 +       if (k >= 0)
1205 +               count = snprintf(buf, PAGE_SIZE, "%d\n", k);
1206 +       mutex_unlock(&bm->mutex);
1207 +
1208 +       return count;
1209 +}
1210 +static DEVICE_ATTR(battery_temp, S_IRUGO,
1211 +                  n810bm_attr_battery_temp_show, NULL);
1212 +
1213 +static ssize_t n810bm_attr_charger_voltage_show(struct device *dev,
1214 +                                               struct device_attribute *attr,
1215 +                                               char *buf)
1216 +{
1217 +       struct n810bm *bm = device_to_n810bm(dev);
1218 +       ssize_t count = -ENODEV;
1219 +       int mv = 0;
1220 +
1221 +       mutex_lock(&bm->mutex);
1222 +       if (bm->charger_present)
1223 +               mv = n810bm_measure_charger_voltage(bm);
1224 +       if (mv >= 0)
1225 +               count = snprintf(buf, PAGE_SIZE, "%d\n", mv);
1226 +       mutex_unlock(&bm->mutex);
1227 +
1228 +       return count;
1229 +}
1230 +static DEVICE_ATTR(charger_voltage, S_IRUGO,
1231 +                  n810bm_attr_charger_voltage_show, NULL);
1232 +
1233 +static ssize_t n810bm_attr_backup_battery_voltage_show(struct device *dev,
1234 +                                                      struct device_attribute *attr,
1235 +                                                      char *buf)
1236 +{
1237 +       struct n810bm *bm = device_to_n810bm(dev);
1238 +       ssize_t count = -ENODEV;
1239 +       int mv;
1240 +
1241 +       mutex_lock(&bm->mutex);
1242 +       mv = n810bm_measure_backup_batt_voltage(bm);
1243 +       if (mv >= 0)
1244 +               count = snprintf(buf, PAGE_SIZE, "%d\n", mv);
1245 +       mutex_unlock(&bm->mutex);
1246 +
1247 +       return count;
1248 +}
1249 +static DEVICE_ATTR(backup_battery_voltage, S_IRUGO,
1250 +                  n810bm_attr_backup_battery_voltage_show, NULL);
1251 +
1252 +static ssize_t n810bm_attr_battery_current_show(struct device *dev,
1253 +                                               struct device_attribute *attr,
1254 +                                               char *buf)
1255 +{
1256 +       struct n810bm *bm = device_to_n810bm(dev);
1257 +       ssize_t count = -ENODEV;
1258 +       int ma = 0;
1259 +
1260 +       mutex_lock(&bm->mutex);
1261 +       if (bm->battery_present)
1262 +               ma = n810bm_measure_batt_current_async(bm);
1263 +       count = snprintf(buf, PAGE_SIZE, "%d\n", ma);
1264 +       mutex_unlock(&bm->mutex);
1265 +
1266 +       return count;
1267 +}
1268 +static DEVICE_ATTR(battery_current, S_IRUGO,
1269 +                  n810bm_attr_battery_current_show, NULL);
1270 +
1271 +static const struct device_attribute *n810bm_attrs[] = {
1272 +       &dev_attr_battery_present,
1273 +       &dev_attr_battery_level,
1274 +       &dev_attr_battery_current,
1275 +       &dev_attr_battery_capacity,
1276 +       &dev_attr_battery_temp,
1277 +       &dev_attr_backup_battery_voltage,
1278 +       &dev_attr_charger_present,
1279 +       &dev_attr_charger_state,
1280 +       &dev_attr_charger_verbose,
1281 +       &dev_attr_charger_voltage,
1282 +       &dev_attr_charger_enable,
1283 +       &dev_attr_charger_pwm,
1284 +};
1285 +
1286 +static void n810bm_notify_work(struct work_struct *work)
1287 +{
1288 +       struct n810bm *bm = container_of(work, struct n810bm, notify_work);
1289 +       unsigned long notify_flags;
1290 +
1291 +       notify_flags = xchg(&bm->notify_flags, 0);
1292 +       mb();
1293 +
1294 +#define do_notify(attr_name)                                           \
1295 +       do {                                                            \
1296 +               if (notify_flags & (1 << N810BM_NOTIFY_##attr_name)) {  \
1297 +                       sysfs_notify(&bm->pdev->dev.kobj, NULL,         \
1298 +                                    dev_attr_##attr_name.attr.name);   \
1299 +               }                                                       \
1300 +       } while (0)
1301 +
1302 +       do_notify(charger_present);
1303 +       do_notify(charger_state);
1304 +       do_notify(charger_pwm);
1305 +}
1306 +
1307 +static int n810bm_charger_set_current_pwm(struct lipocharge *c,
1308 +                                         unsigned int duty_cycle)
1309 +{
1310 +       struct n810bm *bm = container_of(c, struct n810bm, charger);
1311 +       int err = -EINVAL;
1312 +
1313 +       WARN_ON(!mutex_is_locked(&bm->mutex));
1314 +       if (WARN_ON(duty_cycle > 0xFF))
1315 +               goto out;
1316 +       if (WARN_ON(!bm->charger_enabled))
1317 +               goto out;
1318 +       if (WARN_ON(!bm->battery_present || !bm->charger_present))
1319 +               goto out;
1320 +
1321 +       if (duty_cycle != bm->active_current_pwm) {
1322 +               bm->active_current_pwm = duty_cycle;
1323 +               tahvo_write(bm, TAHVO_REG_CHGCURR, duty_cycle);
1324 +               n810bm_notify_charger_pwm(bm);
1325 +       }
1326 +
1327 +       err = 0;
1328 +out:
1329 +
1330 +       return err;
1331 +}
1332 +
1333 +static void n810bm_charger_emergency(struct lipocharge *c)
1334 +{
1335 +       struct n810bm *bm = container_of(c, struct n810bm, charger);
1336 +
1337 +       n810bm_emergency(bm, "Battery charger fault");
1338 +}
1339 +
1340 +static void n810bm_hw_exit(struct n810bm *bm)
1341 +{
1342 +       n810bm_stop_charge(bm);
1343 +       retu_write(bm, RETU_REG_ADCSCR, 0);
1344 +}
1345 +
1346 +static int n810bm_hw_init(struct n810bm *bm)
1347 +{
1348 +       int err;
1349 +
1350 +       err = n810bm_check_adc_sanity(bm);
1351 +       if (err)
1352 +               return err;
1353 +
1354 +       n810bm_stop_charge(bm);
1355 +
1356 +       return 0;
1357 +}
1358 +
1359 +static void n810bm_cancel_and_flush_work(struct n810bm *bm)
1360 +{
1361 +       cancel_delayed_work_sync(&bm->periodic_check_work);
1362 +       cancel_work_sync(&bm->notify_work);
1363 +       cancel_work_sync(&bm->currmeas_irq_work);
1364 +       flush_scheduled_work();
1365 +}
1366 +
1367 +static int n810bm_device_init(struct n810bm *bm)
1368 +{
1369 +       int attr_index;
1370 +       int err;
1371 +
1372 +       bm->charger.rate = LIPORATE_p6C;
1373 +       bm->charger.top_voltage = 4100;
1374 +       bm->charger.duty_cycle_max = 0xFF;
1375 +       bm->charger.set_current_pwm = n810bm_charger_set_current_pwm;
1376 +       bm->charger.emergency = n810bm_charger_emergency;
1377 +       lipocharge_init(&bm->charger, &bm->pdev->dev);
1378 +
1379 +       err = n810bm_hw_init(bm);
1380 +       if (err)
1381 +               goto error;
1382 +       for (attr_index = 0; attr_index < ARRAY_SIZE(n810bm_attrs); attr_index++) {
1383 +               err = device_create_file(&bm->pdev->dev, n810bm_attrs[attr_index]);
1384 +               if (err)
1385 +                       goto err_unwind_attrs;
1386 +       }
1387 +/*XXX
1388 +       err = retu_request_irq(RETU_INT_ADCS,
1389 +                              n810bm_adc_irq_handler,
1390 +                              (unsigned long)bm, "n810bm");
1391 +       if (err)
1392 +               goto err_unwind_attrs;
1393 +*/
1394 +       err = tahvo_request_irq(TAHVO_INT_BATCURR,
1395 +                               n810bm_tahvo_current_measure_irq_handler,
1396 +                               (unsigned long)bm, "n810bm");
1397 +       if (err)
1398 +               goto err_free_retu_irq;
1399 +       tahvo_disable_irq(TAHVO_INT_BATCURR);
1400 +
1401 +       schedule_delayed_work(&bm->periodic_check_work,
1402 +                             round_jiffies_relative(N810BM_CHECK_INTERVAL));
1403 +
1404 +       bm->initialized = 1;
1405 +       dev_info(&bm->pdev->dev, "Battery management initialized");
1406 +
1407 +       return 0;
1408 +
1409 +err_free_retu_irq:
1410 +//XXX  retu_free_irq(RETU_INT_ADCS);
1411 +err_unwind_attrs:
1412 +       for (attr_index--; attr_index >= 0; attr_index--)
1413 +               device_remove_file(&bm->pdev->dev, n810bm_attrs[attr_index]);
1414 +/*err_exit:*/
1415 +       n810bm_hw_exit(bm);
1416 +error:
1417 +       n810bm_cancel_and_flush_work(bm);
1418 +
1419 +       return err;
1420 +}
1421 +
1422 +static void n810bm_device_exit(struct n810bm *bm)
1423 +{
1424 +       int i;
1425 +
1426 +       if (!bm->initialized)
1427 +               return;
1428 +
1429 +       lipocharge_exit(&bm->charger);
1430 +       tahvo_free_irq(TAHVO_INT_BATCURR);
1431 +//XXX  retu_free_irq(RETU_INT_ADCS);
1432 +       for (i = 0; i < ARRAY_SIZE(n810bm_attrs); i++)
1433 +               device_remove_file(&bm->pdev->dev, n810bm_attrs[i]);
1434 +
1435 +       n810bm_cancel_and_flush_work(bm);
1436 +
1437 +       n810bm_hw_exit(bm);
1438 +
1439 +       bm->initialized = 0;
1440 +}
1441 +
1442 +static void n810bm_pmm_block_found(const struct firmware *fw, void *context)
1443 +{
1444 +       struct n810bm *bm = context;
1445 +       int err;
1446 +
1447 +       if (!fw) {
1448 +               dev_err(&bm->pdev->dev,
1449 +                       "CAL PMM block image file not found");
1450 +               goto err_release;
1451 +       }
1452 +       if (fw->size != N810BM_PMM_BLOCK_SIZE ||
1453 +           memcmp(fw->data, "BME-PMM-BLOCK01", 15) != 0) {
1454 +               dev_err(&bm->pdev->dev,
1455 +                       "CAL PMM block image file has an invalid format");
1456 +               goto err_release;
1457 +       }
1458 +
1459 +       err = n810bm_parse_pmm_block(bm, fw);
1460 +       if (err)
1461 +               goto err_release;
1462 +       release_firmware(fw);
1463 +
1464 +       err = n810bm_device_init(bm);
1465 +       if (err) {
1466 +               dev_err(&bm->pdev->dev,
1467 +                       "Failed to initialized battery management (%d)", err);
1468 +               goto error;
1469 +       }
1470 +
1471 +       return;
1472 +err_release:
1473 +       release_firmware(fw);
1474 +error:
1475 +       return;
1476 +}
1477 +
1478 +static int __devinit n810bm_probe(void)
1479 +{
1480 +       struct n810bm *bm;
1481 +       int err;
1482 +
1483 +       if (!n810bm_retu_device || !n810bm_tahvo_device)
1484 +               return 0;
1485 +
1486 +       bm = kzalloc(sizeof(*bm), GFP_KERNEL);
1487 +       if (!bm)
1488 +               return -ENOMEM;
1489 +       bm->pdev = n810bm_retu_device;
1490 +       platform_set_drvdata(n810bm_retu_device, bm);
1491 +       platform_set_drvdata(n810bm_tahvo_device, bm);
1492 +       mutex_init(&bm->mutex);
1493 +       INIT_DELAYED_WORK(&bm->periodic_check_work, n810bm_periodic_check_work);
1494 +       INIT_WORK(&bm->notify_work, n810bm_notify_work);
1495 +       INIT_WORK(&bm->currmeas_irq_work, n810bm_tahvo_current_measure_work);
1496 +
1497 +       dev_info(&bm->pdev->dev, "Requesting CAL BME PMM block firmware file "
1498 +                N810BM_PMM_BLOCK_FILENAME);
1499 +       err = request_firmware_nowait(THIS_MODULE, 1,
1500 +                                     N810BM_PMM_BLOCK_FILENAME,
1501 +                                     &bm->pdev->dev, GFP_KERNEL,
1502 +                                     bm, n810bm_pmm_block_found);
1503 +       if (err) {
1504 +               dev_err(&bm->pdev->dev,
1505 +                       "Failed to request CAL PMM block image file (%d)", err);
1506 +               goto err_free;
1507 +       }
1508 +
1509 +       return 0;
1510 +
1511 +err_free:
1512 +       kfree(bm);
1513 +
1514 +       return err;
1515 +}
1516 +
1517 +static void __devexit n810bm_remove(void)
1518 +{
1519 +       struct n810bm *bm;
1520 +
1521 +       if (!n810bm_retu_device || !n810bm_tahvo_device)
1522 +               return;
1523 +       bm = platform_get_drvdata(n810bm_retu_device);
1524 +
1525 +       n810bm_device_exit(bm);
1526 +
1527 +       kfree(bm);
1528 +       platform_set_drvdata(n810bm_retu_device, NULL);
1529 +       platform_set_drvdata(n810bm_tahvo_device, NULL);
1530 +}
1531 +
1532 +static int __devinit n810bm_retu_probe(struct platform_device *pdev)
1533 +{
1534 +       n810bm_retu_device = pdev;
1535 +       return n810bm_probe();
1536 +}
1537 +
1538 +static int __devexit n810bm_retu_remove(struct platform_device *pdev)
1539 +{
1540 +       n810bm_remove();
1541 +       n810bm_retu_device = NULL;
1542 +       return 0;
1543 +}
1544 +
1545 +static int __devinit n810bm_tahvo_probe(struct platform_device *pdev)
1546 +{
1547 +       n810bm_tahvo_device = pdev;
1548 +       return n810bm_probe();
1549 +}
1550 +
1551 +static int __devexit n810bm_tahvo_remove(struct platform_device *pdev)
1552 +{
1553 +       n810bm_remove();
1554 +       n810bm_tahvo_device = NULL;
1555 +       return 0;
1556 +}
1557 +
1558 +static struct platform_driver n810bm_retu_driver = {
1559 +       .remove         = __devexit_p(n810bm_retu_remove),
1560 +       .driver         = {
1561 +               .name   = "retu-n810bm",
1562 +       }
1563 +};
1564 +
1565 +static struct platform_driver n810bm_tahvo_driver = {
1566 +       .remove         = __devexit_p(n810bm_tahvo_remove),
1567 +       .driver         = {
1568 +               .name   = "tahvo-n810bm",
1569 +       }
1570 +};
1571 +
1572 +/* FIXME: for now alloc the device here... */
1573 +static struct platform_device n810bm_tahvo_dev = {
1574 +       .name   = "tahvo-n810bm",
1575 +       .id     = -1,
1576 +};
1577 +
1578 +static int __init n810bm_modinit(void)
1579 +{
1580 +       int err;
1581 +
1582 +       //FIXME
1583 +       err = platform_device_register(&n810bm_tahvo_dev);
1584 +       if (err)
1585 +               return err;
1586 +
1587 +       err = platform_driver_probe(&n810bm_retu_driver, n810bm_retu_probe);
1588 +       if (err)
1589 +               return err;
1590 +       err = platform_driver_probe(&n810bm_tahvo_driver, n810bm_tahvo_probe);
1591 +       if (err) {
1592 +               platform_driver_unregister(&n810bm_retu_driver);
1593 +               return err;
1594 +       }
1595 +
1596 +       return 0;
1597 +}
1598 +module_init(n810bm_modinit);
1599 +
1600 +static void __exit n810bm_modexit(void)
1601 +{
1602 +       //FIXME
1603 +       platform_device_unregister(&n810bm_tahvo_dev);
1604 +
1605 +       platform_driver_unregister(&n810bm_tahvo_driver);
1606 +       platform_driver_unregister(&n810bm_retu_driver);
1607 +}
1608 +module_exit(n810bm_modexit);
1609 +
1610 +MODULE_DESCRIPTION("Nokia n810 battery management");
1611 +MODULE_FIRMWARE(N810BM_PMM_BLOCK_FILENAME);
1612 +MODULE_LICENSE("GPL");
1613 +MODULE_AUTHOR("Michael Buesch");
1614 --- /dev/null
1615 +++ b/drivers/cbus/lipocharge.c
1616 @@ -0,0 +1,183 @@
1617 +/*
1618 + *   Generic LIPO battery charger
1619 + *
1620 + *   Copyright (c) 2010-2011 Michael Buesch <mb@bu3sch.de>
1621 + *
1622 + *   This program is free software; you can redistribute it and/or
1623 + *   modify it under the terms of the GNU General Public License
1624 + *   as published by the Free Software Foundation; either version 2
1625 + *   of the License, or (at your option) any later version.
1626 + *
1627 + *   This program is distributed in the hope that it will be useful,
1628 + *   but WITHOUT ANY WARRANTY; without even the implied warranty of
1629 + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
1630 + *   GNU General Public License for more details.
1631 + */
1632 +
1633 +#define DEBUG
1634 +
1635 +#include "lipocharge.h"
1636 +
1637 +#include <linux/slab.h>
1638 +
1639 +
1640 +/* Hysteresis constants */
1641 +#define CURRENT_HYST           30 /* mA */
1642 +#define VOLTAGE_HYST           10 /* mV */
1643 +
1644 +/* Threshold constants */
1645 +#define FINISH_CURRENT_PERCENT 3
1646 +
1647 +
1648 +/* Returns the requested first-stage charge current in mA */
1649 +static inline unsigned int get_stage1_charge_current(struct lipocharge *c)
1650 +{
1651 +       /* current = (capacity * C) */
1652 +       return c->capacity * c->rate / 1000;
1653 +}
1654 +
1655 +void lipocharge_init(struct lipocharge *c, struct device *dev)
1656 +{
1657 +       c->dev = dev;
1658 +       c->state = LIPO_IDLE;
1659 +}
1660 +
1661 +void lipocharge_exit(struct lipocharge *c)
1662 +{
1663 +       c->state = LIPO_IDLE;
1664 +}
1665 +
1666 +int lipocharge_start(struct lipocharge *c)
1667 +{
1668 +       int err;
1669 +
1670 +       if (c->state != LIPO_IDLE)
1671 +               return -EBUSY;
1672 +       if (!c->set_current_pwm || !c->emergency)
1673 +               return -EINVAL;
1674 +       if (!c->top_voltage || c->top_voltage > 4200)
1675 +               return -EINVAL;
1676 +
1677 +       c->active_duty_cycle = 0;
1678 +       err = c->set_current_pwm(c, c->active_duty_cycle);
1679 +       if (err)
1680 +               return err;
1681 +       c->state = LIPO_FIRST_STAGE;
1682 +
1683 +       return 0;
1684 +}
1685 +
1686 +void lipocharge_stop(struct lipocharge *c)
1687 +{
1688 +       if (c->state == LIPO_IDLE)
1689 +               return;
1690 +       c->state = LIPO_IDLE;
1691 +}
1692 +
1693 +static int lipocharge_increase_current(struct lipocharge *c,
1694 +                                      unsigned int inc_permille)
1695 +{
1696 +       int old_pwm, new_pwm;
1697 +
1698 +       if (c->active_duty_cycle >= c->duty_cycle_max)
1699 +               return 0;
1700 +
1701 +       old_pwm = c->active_duty_cycle;
1702 +       new_pwm = old_pwm + (c->duty_cycle_max * inc_permille / 1000);
1703 +       new_pwm = min(new_pwm, (int)c->duty_cycle_max);
1704 +       c->active_duty_cycle = new_pwm;
1705 +
1706 +       dev_dbg(c->dev, "lipo: Increasing duty_cycle by "
1707 +               "%u permille (0x%02X -> 0x%02X)",
1708 +               inc_permille, old_pwm, new_pwm);
1709 +
1710 +       return c->set_current_pwm(c, c->active_duty_cycle);
1711 +}
1712 +
1713 +static int lipocharge_decrease_current(struct lipocharge *c,
1714 +                                      unsigned int dec_permille)
1715 +{
1716 +       int old_pwm, new_pwm;
1717 +
1718 +       if (c->active_duty_cycle <= 0)
1719 +               return 0;
1720 +
1721 +       old_pwm = c->active_duty_cycle;
1722 +       new_pwm = old_pwm - (c->duty_cycle_max * dec_permille / 1000);
1723 +       new_pwm = max(0, new_pwm);
1724 +       c->active_duty_cycle = new_pwm;
1725 +
1726 +       dev_dbg(c->dev, "lipo: Decreasing duty_cycle by "
1727 +               "%u permille (0x%02X -> 0x%02X)",
1728 +               dec_permille, old_pwm, new_pwm);
1729 +
1730 +       return c->set_current_pwm(c, c->active_duty_cycle);
1731 +}
1732 +
1733 +/** lipocharge_update_state - Update the charge state
1734 + * @c: The context.
1735 + * @voltage_mV: The measured battery voltage.
1736 + * @current_mA: The measured charge current.
1737 + *             negative -> drain.
1738 + *             positive -> charge.
1739 + * @temp_K: Battery temperature in K.
1740 + *
1741 + * Returns 0 on success, -1 on error.
1742 + * Returns 1, if the charging process is finished.
1743 + */
1744 +int lipocharge_update_state(struct lipocharge *c,
1745 +                           unsigned int voltage_mV,
1746 +                           int current_mA,
1747 +                           unsigned int temp_K)
1748 +{
1749 +       int requested_current, current_diff;
1750 +       int err;
1751 +       unsigned int permille;
1752 +
1753 +       //TODO temp
1754 +
1755 +restart:
1756 +       switch (c->state) {
1757 +       case LIPO_IDLE:
1758 +               dev_err(c->dev, "%s: called while idle", __func__);
1759 +               return -EINVAL;
1760 +       case LIPO_FIRST_STAGE:  /* Constant current */
1761 +//printk("GOT %u %d %u\n", voltage_mV, current_mA, temp_K);
1762 +               if (voltage_mV >= c->top_voltage) {
1763 +                       /* Float voltage reached.
1764 +                        * Switch charger mode to "constant current" */
1765 +                       c->state = LIPO_SECOND_STAGE;
1766 +                       dev_dbg(c->dev, "Switched to second charging stage.");
1767 +                       goto restart;
1768 +               }
1769 +               /* Float voltage not reached, yet.
1770 +                * Try to get the requested constant current. */
1771 +               requested_current = get_stage1_charge_current(c);
1772 +               if (current_mA < 0)
1773 +                       current_mA = 0;
1774 +               current_diff = requested_current - current_mA;
1775 +               if (abs(requested_current - current_mA) > CURRENT_HYST) {
1776 +                       if (current_diff > 0) {
1777 +                               /* Increase current */
1778 +                               permille = current_diff * 1000 / requested_current;
1779 +                               permille /= 2;
1780 +                               err = lipocharge_increase_current(c, permille);
1781 +                               if (err)
1782 +                                       return err;
1783 +                       } else {
1784 +                               /* Decrease current */
1785 +                               permille = (-current_diff) * 1000 / requested_current;
1786 +                               permille /= 2;
1787 +                               err = lipocharge_decrease_current(c, permille);
1788 +                               if (err)
1789 +                                       return err;
1790 +                       }
1791 +               }
1792 +               break;
1793 +       case LIPO_SECOND_STAGE: /* Constant voltage */
1794 +               //TODO
1795 +               break;
1796 +       }
1797 +
1798 +       return 0;
1799 +}
1800 --- /dev/null
1801 +++ b/drivers/cbus/lipocharge.h
1802 @@ -0,0 +1,60 @@
1803 +#ifndef LIPOCHARGE_H_
1804 +#define LIPOCHARGE_H_
1805 +
1806 +#include <linux/types.h>
1807 +#include <linux/device.h>
1808 +
1809 +
1810 +#define LIPORATE(a,b)  (((a) * 1000) + ((b) * 100))
1811 +#define LIPORATE_p6C   LIPORATE(0,6)   /* 0.6C */
1812 +
1813 +enum lipocharge_state {
1814 +       LIPO_IDLE = 0,          /* Not charging */
1815 +       LIPO_FIRST_STAGE,       /* Charging: constant current */
1816 +       LIPO_SECOND_STAGE,      /* Charging: constant voltage */
1817 +};
1818 +
1819 +/** struct lipocharge - A generic LIPO charger
1820 + *
1821 + * @capacity: Battery capacity in mAh.
1822 + * @rate: Charge rate.
1823 + * @top_voltage: Fully charged voltage, in mV.
1824 + * @duty_cycle_max: Max value for duty_cycle.
1825 + *
1826 + * @set_charge_current: Set the charge current PWM duty cycle.
1827 + * @emergency: Something went wrong. Force shutdown.
1828 + */
1829 +struct lipocharge {
1830 +       unsigned int capacity;
1831 +       unsigned int rate;
1832 +       unsigned int top_voltage;
1833 +       unsigned int duty_cycle_max;
1834 +
1835 +       int (*set_current_pwm)(struct lipocharge *c, unsigned int duty_cycle);
1836 +       void (*emergency)(struct lipocharge *c);
1837 +
1838 +       /* internal */
1839 +       struct device *dev;
1840 +       enum lipocharge_state state;
1841 +       unsigned int active_duty_cycle;
1842 +
1843 +       //TODO implement timer to cut power after maximum charge time.
1844 +};
1845 +
1846 +void lipocharge_init(struct lipocharge *c, struct device *dev);
1847 +void lipocharge_exit(struct lipocharge *c);
1848 +
1849 +int lipocharge_start(struct lipocharge *c);
1850 +void lipocharge_stop(struct lipocharge *c);
1851 +
1852 +int lipocharge_update_state(struct lipocharge *c,
1853 +                           unsigned int voltage_mV,
1854 +                           int current_mA,
1855 +                           unsigned int temp_K);
1856 +
1857 +static inline bool lipocharge_is_charging(struct lipocharge *c)
1858 +{
1859 +       return (c->state != LIPO_IDLE);
1860 +}
1861 +
1862 +#endif /* LIPOCHARGE_H_ */
1863 --- a/drivers/cbus/cbus.c
1864 +++ b/drivers/cbus/cbus.c
1865 @@ -35,6 +35,7 @@
1866  #include <linux/platform_device.h>
1867
1868  #include <plat/cbus.h>
1869 +#include <linux/reboot.h>
1870
1871  #include "cbus.h"
1872
1873 @@ -323,6 +324,13 @@ static void __exit cbus_bus_exit(void)
1874  }
1875  module_exit(cbus_bus_exit);
1876
1877 +void cbus_emergency(void)
1878 +{
1879 +       machine_power_off();
1880 +       panic("cbus: Failed to halt machine in emergency state\n");
1881 +}
1882 +EXPORT_SYMBOL(cbus_emergency);
1883 +
1884  MODULE_DESCRIPTION("CBUS serial protocol");
1885  MODULE_LICENSE("GPL");
1886  MODULE_AUTHOR("Juha Yrjölä");
1887 --- a/drivers/cbus/cbus.h
1888 +++ b/drivers/cbus/cbus.h
1889 @@ -26,4 +26,6 @@
1890  extern int cbus_read_reg(unsigned dev, unsigned reg);
1891  extern int cbus_write_reg(unsigned dev, unsigned reg, unsigned val);
1892
1893 +NORET_TYPE void cbus_emergency(void) ATTRIB_NORET;
1894 +
1895  #endif /* __DRIVERS_CBUS_CBUS_H */
1896 --- a/drivers/cbus/retu.c
1897 +++ b/drivers/cbus/retu.c
1898 @@ -425,6 +425,11 @@ static int retu_allocate_children(struct
1899         if (!child)
1900                 return -ENOMEM;
1901
1902 +       child = retu_allocate_child("retu-n810bm", parent, irq_base,
1903 +                       RETU_INT_ADCS, -1, 1);
1904 +       if (!child)
1905 +               return -ENOMEM;
1906 +
1907         return 0;
1908  }
1909
1910 --- a/drivers/cbus/tahvo.c
1911 +++ b/drivers/cbus/tahvo.c
1912 @@ -54,6 +54,7 @@ static int tahvo_is_betty;
1913
1914  static struct tasklet_struct tahvo_tasklet;
1915  spinlock_t tahvo_lock = SPIN_LOCK_UNLOCKED;
1916 +EXPORT_SYMBOL(tahvo_lock);
1917
1918  struct tahvo_irq_handler_desc {
1919         int (*func)(unsigned long);
1920 @@ -115,6 +116,7 @@ void tahvo_set_clear_reg_bits(unsigned r
1921         tahvo_write_reg(reg, w);
1922         spin_unlock_irqrestore(&tahvo_lock, flags);
1923  }
1924 +EXPORT_SYMBOL(tahvo_set_clear_reg_bits);
1925
1926  /*
1927   * Disable given TAHVO interrupt