linux/drivers/power/supply/twl4030_charger.c
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   1/*
   2 * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
   3 *
   4 * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
   5 *
   6 * based on twl4030_bci_battery.c by TI
   7 * Copyright (C) 2008 Texas Instruments, Inc.
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 */
  14
  15#include <linux/init.h>
  16#include <linux/module.h>
  17#include <linux/slab.h>
  18#include <linux/err.h>
  19#include <linux/platform_device.h>
  20#include <linux/interrupt.h>
  21#include <linux/i2c/twl.h>
  22#include <linux/power_supply.h>
  23#include <linux/notifier.h>
  24#include <linux/usb/otg.h>
  25#include <linux/iio/consumer.h>
  26
  27#define TWL4030_BCIMDEN         0x00
  28#define TWL4030_BCIMDKEY        0x01
  29#define TWL4030_BCIMSTATEC      0x02
  30#define TWL4030_BCIICHG         0x08
  31#define TWL4030_BCIVAC          0x0a
  32#define TWL4030_BCIVBUS         0x0c
  33#define TWL4030_BCIMFSTS3       0x0F
  34#define TWL4030_BCIMFSTS4       0x10
  35#define TWL4030_BCICTL1         0x23
  36#define TWL4030_BB_CFG          0x12
  37#define TWL4030_BCIIREF1        0x27
  38#define TWL4030_BCIIREF2        0x28
  39#define TWL4030_BCIMFKEY        0x11
  40#define TWL4030_BCIMFEN3        0x14
  41#define TWL4030_BCIMFTH8        0x1d
  42#define TWL4030_BCIMFTH9        0x1e
  43#define TWL4030_BCIWDKEY        0x21
  44
  45#define TWL4030_BCIMFSTS1       0x01
  46
  47#define TWL4030_BCIAUTOWEN      BIT(5)
  48#define TWL4030_CONFIG_DONE     BIT(4)
  49#define TWL4030_CVENAC          BIT(2)
  50#define TWL4030_BCIAUTOUSB      BIT(1)
  51#define TWL4030_BCIAUTOAC       BIT(0)
  52#define TWL4030_CGAIN           BIT(5)
  53#define TWL4030_USBFASTMCHG     BIT(2)
  54#define TWL4030_STS_VBUS        BIT(7)
  55#define TWL4030_STS_USB_ID      BIT(2)
  56#define TWL4030_BBCHEN          BIT(4)
  57#define TWL4030_BBSEL_MASK      0x0c
  58#define TWL4030_BBSEL_2V5       0x00
  59#define TWL4030_BBSEL_3V0       0x04
  60#define TWL4030_BBSEL_3V1       0x08
  61#define TWL4030_BBSEL_3V2       0x0c
  62#define TWL4030_BBISEL_MASK     0x03
  63#define TWL4030_BBISEL_25uA     0x00
  64#define TWL4030_BBISEL_150uA    0x01
  65#define TWL4030_BBISEL_500uA    0x02
  66#define TWL4030_BBISEL_1000uA   0x03
  67
  68#define TWL4030_BATSTSPCHG      BIT(2)
  69#define TWL4030_BATSTSMCHG      BIT(6)
  70
  71/* BCI interrupts */
  72#define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  73#define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  74#define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  75#define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  76#define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  77#define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  78#define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  79#define TWL4030_BATSTS          BIT(7) /* Battery status */
  80
  81#define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  82#define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  83#define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  84#define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  85
  86#define TWL4030_MSTATEC_USB             BIT(4)
  87#define TWL4030_MSTATEC_AC              BIT(5)
  88#define TWL4030_MSTATEC_MASK            0x0f
  89#define TWL4030_MSTATEC_QUICK1          0x02
  90#define TWL4030_MSTATEC_QUICK7          0x07
  91#define TWL4030_MSTATEC_COMPLETE1       0x0b
  92#define TWL4030_MSTATEC_COMPLETE4       0x0e
  93
  94/*
  95 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
  96 * then AC is available.
  97 */
  98static inline int ac_available(struct iio_channel *channel_vac)
  99{
 100        int val, err;
 101
 102        if (!channel_vac)
 103                return 0;
 104
 105        err = iio_read_channel_processed(channel_vac, &val);
 106        if (err < 0)
 107                return 0;
 108        return val > 4500;
 109}
 110
 111static bool allow_usb;
 112module_param(allow_usb, bool, 0644);
 113MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
 114
 115struct twl4030_bci {
 116        struct device           *dev;
 117        struct power_supply     *ac;
 118        struct power_supply     *usb;
 119        struct usb_phy          *transceiver;
 120        struct notifier_block   usb_nb;
 121        struct work_struct      work;
 122        int                     irq_chg;
 123        int                     irq_bci;
 124        int                     usb_enabled;
 125
 126        /*
 127         * ichg_* and *_cur values in uA. If any are 'large', we set
 128         * CGAIN to '1' which doubles the range for half the
 129         * precision.
 130         */
 131        unsigned int            ichg_eoc, ichg_lo, ichg_hi;
 132        unsigned int            usb_cur, ac_cur;
 133        struct iio_channel      *channel_vac;
 134        bool                    ac_is_active;
 135        int                     usb_mode, ac_mode; /* charging mode requested */
 136#define CHARGE_OFF      0
 137#define CHARGE_AUTO     1
 138#define CHARGE_LINEAR   2
 139
 140        /* When setting the USB current we slowly increase the
 141         * requested current until target is reached or the voltage
 142         * drops below 4.75V.  In the latter case we step back one
 143         * step.
 144         */
 145        unsigned int            usb_cur_target;
 146        struct delayed_work     current_worker;
 147#define USB_CUR_STEP    20000   /* 20mA at a time */
 148#define USB_MIN_VOLT    4750000 /* 4.75V */
 149#define USB_CUR_DELAY   msecs_to_jiffies(100)
 150#define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */
 151
 152        unsigned long           event;
 153};
 154
 155/* strings for 'usb_mode' values */
 156static const char *modes[] = { "off", "auto", "continuous" };
 157
 158/*
 159 * clear and set bits on an given register on a given module
 160 */
 161static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
 162{
 163        u8 val = 0;
 164        int ret;
 165
 166        ret = twl_i2c_read_u8(mod_no, &val, reg);
 167        if (ret)
 168                return ret;
 169
 170        val &= ~clear;
 171        val |= set;
 172
 173        return twl_i2c_write_u8(mod_no, val, reg);
 174}
 175
 176static int twl4030_bci_read(u8 reg, u8 *val)
 177{
 178        return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
 179}
 180
 181static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 182{
 183        return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
 184                        TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 185                        TWL4030_PM_MASTER_BOOT_BCI);
 186}
 187
 188static int twl4030bci_read_adc_val(u8 reg)
 189{
 190        int ret, temp;
 191        u8 val;
 192
 193        /* read MSB */
 194        ret = twl4030_bci_read(reg + 1, &val);
 195        if (ret)
 196                return ret;
 197
 198        temp = (int)(val & 0x03) << 8;
 199
 200        /* read LSB */
 201        ret = twl4030_bci_read(reg, &val);
 202        if (ret)
 203                return ret;
 204
 205        return temp | val;
 206}
 207
 208/*
 209 * TI provided formulas:
 210 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 211 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 212 * Here we use integer approximation of:
 213 * CGAIN == 0: val * 1.6618 - 0.85 * 1000
 214 * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
 215 */
 216/*
 217 * convert twl register value for currents into uA
 218 */
 219static int regval2ua(int regval, bool cgain)
 220{
 221        if (cgain)
 222                return (regval * 16618 - 8500 * 1000) / 5;
 223        else
 224                return (regval * 16618 - 8500 * 1000) / 10;
 225}
 226
 227/*
 228 * convert uA currents into twl register value
 229 */
 230static int ua2regval(int ua, bool cgain)
 231{
 232        int ret;
 233        if (cgain)
 234                ua /= 2;
 235        ret = (ua * 10 + 8500 * 1000) / 16618;
 236        /* rounding problems */
 237        if (ret < 512)
 238                ret = 512;
 239        return ret;
 240}
 241
 242static int twl4030_charger_update_current(struct twl4030_bci *bci)
 243{
 244        int status;
 245        int cur;
 246        unsigned reg, cur_reg;
 247        u8 bcictl1, oldreg, fullreg;
 248        bool cgain = false;
 249        u8 boot_bci;
 250
 251        /*
 252         * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
 253         * and AC is enabled, set current for 'ac'
 254         */
 255        if (ac_available(bci->channel_vac)) {
 256                cur = bci->ac_cur;
 257                bci->ac_is_active = true;
 258        } else {
 259                cur = bci->usb_cur;
 260                bci->ac_is_active = false;
 261                if (cur > bci->usb_cur_target) {
 262                        cur = bci->usb_cur_target;
 263                        bci->usb_cur = cur;
 264                }
 265                if (cur < bci->usb_cur_target)
 266                        schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
 267        }
 268
 269        /* First, check thresholds and see if cgain is needed */
 270        if (bci->ichg_eoc >= 200000)
 271                cgain = true;
 272        if (bci->ichg_lo >= 400000)
 273                cgain = true;
 274        if (bci->ichg_hi >= 820000)
 275                cgain = true;
 276        if (cur > 852000)
 277                cgain = true;
 278
 279        status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 280        if (status < 0)
 281                return status;
 282        if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
 283                            TWL4030_PM_MASTER_BOOT_BCI) < 0)
 284                boot_bci = 0;
 285        boot_bci &= 7;
 286
 287        if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
 288                /* Need to turn for charging while we change the
 289                 * CGAIN bit.  Leave it off while everything is
 290                 * updated.
 291                 */
 292                twl4030_clear_set_boot_bci(boot_bci, 0);
 293
 294        /*
 295         * For ichg_eoc, the hardware only supports reg values matching
 296         * 100XXXX000, and requires the XXXX be stored in the high nibble
 297         * of TWL4030_BCIMFTH8.
 298         */
 299        reg = ua2regval(bci->ichg_eoc, cgain);
 300        if (reg > 0x278)
 301                reg = 0x278;
 302        if (reg < 0x200)
 303                reg = 0x200;
 304        reg = (reg >> 3) & 0xf;
 305        fullreg = reg << 4;
 306
 307        /*
 308         * For ichg_lo, reg value must match 10XXXX0000.
 309         * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
 310         */
 311        reg = ua2regval(bci->ichg_lo, cgain);
 312        if (reg > 0x2F0)
 313                reg = 0x2F0;
 314        if (reg < 0x200)
 315                reg = 0x200;
 316        reg = (reg >> 4) & 0xf;
 317        fullreg |= reg;
 318
 319        /* ichg_eoc and ichg_lo live in same register */
 320        status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
 321        if (status < 0)
 322                return status;
 323        if (oldreg != fullreg) {
 324                status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
 325                                          TWL4030_BCIMFKEY);
 326                if (status < 0)
 327                        return status;
 328                twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 329                                 fullreg, TWL4030_BCIMFTH8);
 330        }
 331
 332        /* ichg_hi threshold must be 1XXXX01100 (I think) */
 333        reg = ua2regval(bci->ichg_hi, cgain);
 334        if (reg > 0x3E0)
 335                reg = 0x3E0;
 336        if (reg < 0x200)
 337                reg = 0x200;
 338        fullreg = (reg >> 5) & 0xF;
 339        fullreg <<= 4;
 340        status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
 341        if (status < 0)
 342                return status;
 343        if ((oldreg & 0xF0) != fullreg) {
 344                fullreg |= (oldreg & 0x0F);
 345                status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 346                                          TWL4030_BCIMFKEY);
 347                if (status < 0)
 348                        return status;
 349                twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 350                                 fullreg, TWL4030_BCIMFTH9);
 351        }
 352
 353        /*
 354         * And finally, set the current.  This is stored in
 355         * two registers.
 356         */
 357        reg = ua2regval(cur, cgain);
 358        /* we have only 10 bits */
 359        if (reg > 0x3ff)
 360                reg = 0x3ff;
 361        status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
 362        if (status < 0)
 363                return status;
 364        cur_reg = oldreg;
 365        status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
 366        if (status < 0)
 367                return status;
 368        cur_reg |= oldreg << 8;
 369        if (reg != oldreg) {
 370                /* disable write protection for one write access for
 371                 * BCIIREF */
 372                status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 373                                          TWL4030_BCIMFKEY);
 374                if (status < 0)
 375                        return status;
 376                status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 377                                          (reg & 0x100) ? 3 : 2,
 378                                          TWL4030_BCIIREF2);
 379                if (status < 0)
 380                        return status;
 381                /* disable write protection for one write access for
 382                 * BCIIREF */
 383                status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 384                                          TWL4030_BCIMFKEY);
 385                if (status < 0)
 386                        return status;
 387                status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 388                                          reg & 0xff,
 389                                          TWL4030_BCIIREF1);
 390        }
 391        if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
 392                /* Flip CGAIN and re-enable charging */
 393                bcictl1 ^= TWL4030_CGAIN;
 394                twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 395                                 bcictl1, TWL4030_BCICTL1);
 396                twl4030_clear_set_boot_bci(0, boot_bci);
 397        }
 398        return 0;
 399}
 400
 401static int twl4030_charger_get_current(void);
 402
 403static void twl4030_current_worker(struct work_struct *data)
 404{
 405        int v, curr;
 406        int res;
 407        struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
 408                                               current_worker.work);
 409
 410        res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 411        if (res < 0)
 412                v = 0;
 413        else
 414                /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 415                v = res * 6843;
 416        curr = twl4030_charger_get_current();
 417
 418        dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
 419                bci->usb_cur, bci->usb_cur_target);
 420
 421        if (v < USB_MIN_VOLT) {
 422                /* Back up and stop adjusting. */
 423                bci->usb_cur -= USB_CUR_STEP;
 424                bci->usb_cur_target = bci->usb_cur;
 425        } else if (bci->usb_cur >= bci->usb_cur_target ||
 426                   bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
 427                /* Reached target and voltage is OK - stop */
 428                return;
 429        } else {
 430                bci->usb_cur += USB_CUR_STEP;
 431                schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
 432        }
 433        twl4030_charger_update_current(bci);
 434}
 435
 436/*
 437 * Enable/Disable USB Charge functionality.
 438 */
 439static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 440{
 441        int ret;
 442
 443        if (bci->usb_mode == CHARGE_OFF)
 444                enable = false;
 445        if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
 446
 447                twl4030_charger_update_current(bci);
 448
 449                /* Need to keep phy powered */
 450                if (!bci->usb_enabled) {
 451                        pm_runtime_get_sync(bci->transceiver->dev);
 452                        bci->usb_enabled = 1;
 453                }
 454
 455                if (bci->usb_mode == CHARGE_AUTO)
 456                        /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 457                        ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 458
 459                /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 460                ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
 461                        TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 462                if (bci->usb_mode == CHARGE_LINEAR) {
 463                        twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
 464                        /* Watch dog key: WOVF acknowledge */
 465                        ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
 466                                               TWL4030_BCIWDKEY);
 467                        /* 0x24 + EKEY6: off mode */
 468                        ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
 469                                               TWL4030_BCIMDKEY);
 470                        /* EKEY2: Linear charge: USB path */
 471                        ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
 472                                               TWL4030_BCIMDKEY);
 473                        /* WDKEY5: stop watchdog count */
 474                        ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
 475                                               TWL4030_BCIWDKEY);
 476                        /* enable MFEN3 access */
 477                        ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
 478                                               TWL4030_BCIMFKEY);
 479                         /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
 480                          *                      (charging continues)
 481                          * ICHGLOWEN - current level monitor (charge continues)
 482                          * don't monitor over-current or heat save
 483                          */
 484                        ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
 485                                               TWL4030_BCIMFEN3);
 486                }
 487        } else {
 488                ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 489                ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
 490                                        TWL4030_BCIMDKEY);
 491                if (bci->usb_enabled) {
 492                        pm_runtime_mark_last_busy(bci->transceiver->dev);
 493                        pm_runtime_put_autosuspend(bci->transceiver->dev);
 494                        bci->usb_enabled = 0;
 495                }
 496                bci->usb_cur = 0;
 497        }
 498
 499        return ret;
 500}
 501
 502/*
 503 * Enable/Disable AC Charge funtionality.
 504 */
 505static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
 506{
 507        int ret;
 508
 509        if (bci->ac_mode == CHARGE_OFF)
 510                enable = false;
 511
 512        if (enable)
 513                ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 514        else
 515                ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 516
 517        return ret;
 518}
 519
 520/*
 521 * Enable/Disable charging of Backup Battery.
 522 */
 523static int twl4030_charger_enable_backup(int uvolt, int uamp)
 524{
 525        int ret;
 526        u8 flags;
 527
 528        if (uvolt < 2500000 ||
 529            uamp < 25) {
 530                /* disable charging of backup battery */
 531                ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 532                                        TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
 533                return ret;
 534        }
 535
 536        flags = TWL4030_BBCHEN;
 537        if (uvolt >= 3200000)
 538                flags |= TWL4030_BBSEL_3V2;
 539        else if (uvolt >= 3100000)
 540                flags |= TWL4030_BBSEL_3V1;
 541        else if (uvolt >= 3000000)
 542                flags |= TWL4030_BBSEL_3V0;
 543        else
 544                flags |= TWL4030_BBSEL_2V5;
 545
 546        if (uamp >= 1000)
 547                flags |= TWL4030_BBISEL_1000uA;
 548        else if (uamp >= 500)
 549                flags |= TWL4030_BBISEL_500uA;
 550        else if (uamp >= 150)
 551                flags |= TWL4030_BBISEL_150uA;
 552        else
 553                flags |= TWL4030_BBISEL_25uA;
 554
 555        ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 556                                TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
 557                                flags,
 558                                TWL4030_BB_CFG);
 559
 560        return ret;
 561}
 562
 563/*
 564 * TWL4030 CHG_PRES (AC charger presence) events
 565 */
 566static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 567{
 568        struct twl4030_bci *bci = arg;
 569
 570        dev_dbg(bci->dev, "CHG_PRES irq\n");
 571        /* reset current on each 'plug' event */
 572        bci->ac_cur = 500000;
 573        twl4030_charger_update_current(bci);
 574        power_supply_changed(bci->ac);
 575        power_supply_changed(bci->usb);
 576
 577        return IRQ_HANDLED;
 578}
 579
 580/*
 581 * TWL4030 BCI monitoring events
 582 */
 583static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 584{
 585        struct twl4030_bci *bci = arg;
 586        u8 irqs1, irqs2;
 587        int ret;
 588
 589        ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 590                              TWL4030_INTERRUPTS_BCIISR1A);
 591        if (ret < 0)
 592                return IRQ_HANDLED;
 593
 594        ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 595                              TWL4030_INTERRUPTS_BCIISR2A);
 596        if (ret < 0)
 597                return IRQ_HANDLED;
 598
 599        dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 600
 601        if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 602                /* charger state change, inform the core */
 603                power_supply_changed(bci->ac);
 604                power_supply_changed(bci->usb);
 605        }
 606        twl4030_charger_update_current(bci);
 607
 608        /* various monitoring events, for now we just log them here */
 609        if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
 610                dev_warn(bci->dev, "battery temperature out of range\n");
 611
 612        if (irqs1 & TWL4030_BATSTS)
 613                dev_crit(bci->dev, "battery disconnected\n");
 614
 615        if (irqs2 & TWL4030_VBATOV)
 616                dev_crit(bci->dev, "VBAT overvoltage\n");
 617
 618        if (irqs2 & TWL4030_VBUSOV)
 619                dev_crit(bci->dev, "VBUS overvoltage\n");
 620
 621        if (irqs2 & TWL4030_ACCHGOV)
 622                dev_crit(bci->dev, "Ac charger overvoltage\n");
 623
 624        return IRQ_HANDLED;
 625}
 626
 627static void twl4030_bci_usb_work(struct work_struct *data)
 628{
 629        struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 630
 631        switch (bci->event) {
 632        case USB_EVENT_VBUS:
 633        case USB_EVENT_CHARGER:
 634                twl4030_charger_enable_usb(bci, true);
 635                break;
 636        case USB_EVENT_NONE:
 637                twl4030_charger_enable_usb(bci, false);
 638                break;
 639        }
 640}
 641
 642static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 643                               void *priv)
 644{
 645        struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
 646
 647        dev_dbg(bci->dev, "OTG notify %lu\n", val);
 648
 649        /* reset current on each 'plug' event */
 650        if (allow_usb)
 651                bci->usb_cur_target = 500000;
 652        else
 653                bci->usb_cur_target = 100000;
 654
 655        bci->event = val;
 656        schedule_work(&bci->work);
 657
 658        return NOTIFY_OK;
 659}
 660
 661/*
 662 * sysfs charger enabled store
 663 */
 664static ssize_t
 665twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
 666                          const char *buf, size_t n)
 667{
 668        struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 669        int mode;
 670        int status;
 671
 672        mode = sysfs_match_string(modes, buf);
 673        if (mode < 0)
 674                return mode;
 675
 676        if (dev == &bci->ac->dev) {
 677                if (mode == 2)
 678                        return -EINVAL;
 679                twl4030_charger_enable_ac(bci, false);
 680                bci->ac_mode = mode;
 681                status = twl4030_charger_enable_ac(bci, true);
 682        } else {
 683                twl4030_charger_enable_usb(bci, false);
 684                bci->usb_mode = mode;
 685                status = twl4030_charger_enable_usb(bci, true);
 686        }
 687        return (status == 0) ? n : status;
 688}
 689
 690/*
 691 * sysfs charger enabled show
 692 */
 693static ssize_t
 694twl4030_bci_mode_show(struct device *dev,
 695                             struct device_attribute *attr, char *buf)
 696{
 697        struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 698        int len = 0;
 699        int i;
 700        int mode = bci->usb_mode;
 701
 702        if (dev == &bci->ac->dev)
 703                mode = bci->ac_mode;
 704
 705        for (i = 0; i < ARRAY_SIZE(modes); i++)
 706                if (mode == i)
 707                        len += snprintf(buf+len, PAGE_SIZE-len,
 708                                        "[%s] ", modes[i]);
 709                else
 710                        len += snprintf(buf+len, PAGE_SIZE-len,
 711                                        "%s ", modes[i]);
 712        buf[len-1] = '\n';
 713        return len;
 714}
 715static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
 716                   twl4030_bci_mode_store);
 717
 718static int twl4030_charger_get_current(void)
 719{
 720        int curr;
 721        int ret;
 722        u8 bcictl1;
 723
 724        curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 725        if (curr < 0)
 726                return curr;
 727
 728        ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 729        if (ret)
 730                return ret;
 731
 732        return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
 733}
 734
 735/*
 736 * Returns the main charge FSM state
 737 * Or < 0 on failure.
 738 */
 739static int twl4030bci_state(struct twl4030_bci *bci)
 740{
 741        int ret;
 742        u8 state;
 743
 744        ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 745        if (ret) {
 746                pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 747                return ret;
 748        }
 749
 750        dev_dbg(bci->dev, "state: %02x\n", state);
 751
 752        return state;
 753}
 754
 755static int twl4030_bci_state_to_status(int state)
 756{
 757        state &= TWL4030_MSTATEC_MASK;
 758        if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 759                return POWER_SUPPLY_STATUS_CHARGING;
 760        else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 761                                        state <= TWL4030_MSTATEC_COMPLETE4)
 762                return POWER_SUPPLY_STATUS_FULL;
 763        else
 764                return POWER_SUPPLY_STATUS_NOT_CHARGING;
 765}
 766
 767static int twl4030_bci_get_property(struct power_supply *psy,
 768                                    enum power_supply_property psp,
 769                                    union power_supply_propval *val)
 770{
 771        struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
 772        int is_charging;
 773        int state;
 774        int ret;
 775
 776        state = twl4030bci_state(bci);
 777        if (state < 0)
 778                return state;
 779
 780        if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 781                is_charging = state & TWL4030_MSTATEC_USB;
 782        else
 783                is_charging = state & TWL4030_MSTATEC_AC;
 784        if (!is_charging) {
 785                u8 s;
 786                twl4030_bci_read(TWL4030_BCIMDEN, &s);
 787                if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 788                        is_charging = s & 1;
 789                else
 790                        is_charging = s & 2;
 791                if (is_charging)
 792                        /* A little white lie */
 793                        state = TWL4030_MSTATEC_QUICK1;
 794        }
 795
 796        switch (psp) {
 797        case POWER_SUPPLY_PROP_STATUS:
 798                if (is_charging)
 799                        val->intval = twl4030_bci_state_to_status(state);
 800                else
 801                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 802                break;
 803        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 804                /* charging must be active for meaningful result */
 805                if (!is_charging)
 806                        return -ENODATA;
 807                if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
 808                        ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 809                        if (ret < 0)
 810                                return ret;
 811                        /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 812                        val->intval = ret * 6843;
 813                } else {
 814                        ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 815                        if (ret < 0)
 816                                return ret;
 817                        /* BCIVAC uses ADCIN11, 10/1023 V/step */
 818                        val->intval = ret * 9775;
 819                }
 820                break;
 821        case POWER_SUPPLY_PROP_CURRENT_NOW:
 822                if (!is_charging)
 823                        return -ENODATA;
 824                /* current measurement is shared between AC and USB */
 825                ret = twl4030_charger_get_current();
 826                if (ret < 0)
 827                        return ret;
 828                val->intval = ret;
 829                break;
 830        case POWER_SUPPLY_PROP_ONLINE:
 831                val->intval = is_charging &&
 832                        twl4030_bci_state_to_status(state) !=
 833                                POWER_SUPPLY_STATUS_NOT_CHARGING;
 834                break;
 835        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 836                val->intval = -1;
 837                if (psy->desc->type != POWER_SUPPLY_TYPE_USB) {
 838                        if (!bci->ac_is_active)
 839                                val->intval = bci->ac_cur;
 840                } else {
 841                        if (bci->ac_is_active)
 842                                val->intval = bci->usb_cur_target;
 843                }
 844                if (val->intval < 0) {
 845                        u8 bcictl1;
 846
 847                        val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 848                        if (val->intval < 0)
 849                                return val->intval;
 850                        ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 851                        if (ret < 0)
 852                                return ret;
 853                        val->intval = regval2ua(val->intval, bcictl1 &
 854                                                        TWL4030_CGAIN);
 855                }
 856                break;
 857        default:
 858                return -EINVAL;
 859        }
 860
 861        return 0;
 862}
 863
 864static int twl4030_bci_set_property(struct power_supply *psy,
 865                                    enum power_supply_property psp,
 866                                    const union power_supply_propval *val)
 867{
 868        struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
 869
 870        switch (psp) {
 871        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 872                if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 873                        bci->usb_cur_target = val->intval;
 874                else
 875                        bci->ac_cur = val->intval;
 876                twl4030_charger_update_current(bci);
 877                break;
 878        default:
 879                return -EINVAL;
 880        }
 881
 882        return 0;
 883}
 884
 885static int twl4030_bci_property_is_writeable(struct power_supply *psy,
 886                                      enum power_supply_property psp)
 887{
 888        switch (psp) {
 889        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 890                return true;
 891        default:
 892                return false;
 893        }
 894}
 895
 896static enum power_supply_property twl4030_charger_props[] = {
 897        POWER_SUPPLY_PROP_STATUS,
 898        POWER_SUPPLY_PROP_ONLINE,
 899        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 900        POWER_SUPPLY_PROP_CURRENT_NOW,
 901        POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 902};
 903
 904#ifdef CONFIG_OF
 905static const struct twl4030_bci_platform_data *
 906twl4030_bci_parse_dt(struct device *dev)
 907{
 908        struct device_node *np = dev->of_node;
 909        struct twl4030_bci_platform_data *pdata;
 910        u32 num;
 911
 912        if (!np)
 913                return NULL;
 914        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 915        if (!pdata)
 916                return pdata;
 917
 918        if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
 919                pdata->bb_uvolt = num;
 920        if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
 921                pdata->bb_uamp = num;
 922        return pdata;
 923}
 924#else
 925static inline const struct twl4030_bci_platform_data *
 926twl4030_bci_parse_dt(struct device *dev)
 927{
 928        return NULL;
 929}
 930#endif
 931
 932static const struct power_supply_desc twl4030_bci_ac_desc = {
 933        .name           = "twl4030_ac",
 934        .type           = POWER_SUPPLY_TYPE_MAINS,
 935        .properties     = twl4030_charger_props,
 936        .num_properties = ARRAY_SIZE(twl4030_charger_props),
 937        .get_property   = twl4030_bci_get_property,
 938        .set_property   = twl4030_bci_set_property,
 939        .property_is_writeable  = twl4030_bci_property_is_writeable,
 940};
 941
 942static const struct power_supply_desc twl4030_bci_usb_desc = {
 943        .name           = "twl4030_usb",
 944        .type           = POWER_SUPPLY_TYPE_USB,
 945        .properties     = twl4030_charger_props,
 946        .num_properties = ARRAY_SIZE(twl4030_charger_props),
 947        .get_property   = twl4030_bci_get_property,
 948        .set_property   = twl4030_bci_set_property,
 949        .property_is_writeable  = twl4030_bci_property_is_writeable,
 950};
 951
 952static int twl4030_bci_probe(struct platform_device *pdev)
 953{
 954        struct twl4030_bci *bci;
 955        const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 956        int ret;
 957        u32 reg;
 958
 959        bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
 960        if (bci == NULL)
 961                return -ENOMEM;
 962
 963        if (!pdata)
 964                pdata = twl4030_bci_parse_dt(&pdev->dev);
 965
 966        bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
 967        bci->ichg_lo = 241000; /* Low threshold */
 968        bci->ichg_hi = 500000; /* High threshold */
 969        bci->ac_cur = 500000; /* 500mA */
 970        if (allow_usb)
 971                bci->usb_cur_target = 500000;  /* 500mA */
 972        else
 973                bci->usb_cur_target = 100000;  /* 100mA */
 974        bci->usb_mode = CHARGE_AUTO;
 975        bci->ac_mode = CHARGE_AUTO;
 976
 977        bci->dev = &pdev->dev;
 978        bci->irq_chg = platform_get_irq(pdev, 0);
 979        bci->irq_bci = platform_get_irq(pdev, 1);
 980
 981        platform_set_drvdata(pdev, bci);
 982
 983        INIT_WORK(&bci->work, twl4030_bci_usb_work);
 984        INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
 985
 986        bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
 987        if (IS_ERR(bci->channel_vac)) {
 988                ret = PTR_ERR(bci->channel_vac);
 989                if (ret == -EPROBE_DEFER)
 990                        return ret;     /* iio not ready */
 991                dev_warn(&pdev->dev, "could not request vac iio channel (%d)",
 992                        ret);
 993                bci->channel_vac = NULL;
 994        }
 995
 996        if (bci->dev->of_node) {
 997                struct device_node *phynode;
 998
 999                phynode = of_find_compatible_node(bci->dev->of_node->parent,
1000                                                  NULL, "ti,twl4030-usb");
1001                if (phynode) {
1002                        bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
1003                        bci->transceiver = devm_usb_get_phy_by_node(
1004                                bci->dev, phynode, &bci->usb_nb);
1005                        if (IS_ERR(bci->transceiver)) {
1006                                ret = PTR_ERR(bci->transceiver);
1007                                if (ret == -EPROBE_DEFER)
1008                                        return ret;     /* phy not ready */
1009                                dev_warn(&pdev->dev, "could not request transceiver (%d)",
1010                                        ret);
1011                                bci->transceiver = NULL;
1012                        }
1013                }
1014        }
1015
1016        bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1017                                             NULL);
1018        if (IS_ERR(bci->ac)) {
1019                ret = PTR_ERR(bci->ac);
1020                dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1021                return ret;
1022        }
1023
1024        bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1025                                              NULL);
1026        if (IS_ERR(bci->usb)) {
1027                ret = PTR_ERR(bci->usb);
1028                dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1029                return ret;
1030        }
1031
1032        ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1033                        twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1034                        bci);
1035        if (ret < 0) {
1036                dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1037                        bci->irq_chg, ret);
1038                return ret;
1039        }
1040
1041        ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1042                        twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1043        if (ret < 0) {
1044                dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1045                        bci->irq_bci, ret);
1046                return ret;
1047        }
1048
1049        /* Enable interrupts now. */
1050        reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1051                TWL4030_TBATOR1 | TWL4030_BATSTS);
1052        ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1053                               TWL4030_INTERRUPTS_BCIIMR1A);
1054        if (ret < 0) {
1055                dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1056                return ret;
1057        }
1058
1059        reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1060        ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1061                               TWL4030_INTERRUPTS_BCIIMR2A);
1062        if (ret < 0)
1063                dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1064
1065        twl4030_charger_update_current(bci);
1066        if (device_create_file(&bci->usb->dev, &dev_attr_mode))
1067                dev_warn(&pdev->dev, "could not create sysfs file\n");
1068        if (device_create_file(&bci->ac->dev, &dev_attr_mode))
1069                dev_warn(&pdev->dev, "could not create sysfs file\n");
1070
1071        twl4030_charger_enable_ac(bci, true);
1072        if (!IS_ERR_OR_NULL(bci->transceiver))
1073                twl4030_bci_usb_ncb(&bci->usb_nb,
1074                                    bci->transceiver->last_event,
1075                                    NULL);
1076        else
1077                twl4030_charger_enable_usb(bci, false);
1078        if (pdata)
1079                twl4030_charger_enable_backup(pdata->bb_uvolt,
1080                                              pdata->bb_uamp);
1081        else
1082                twl4030_charger_enable_backup(0, 0);
1083
1084        return 0;
1085}
1086
1087static int twl4030_bci_remove(struct platform_device *pdev)
1088{
1089        struct twl4030_bci *bci = platform_get_drvdata(pdev);
1090
1091        twl4030_charger_enable_ac(bci, false);
1092        twl4030_charger_enable_usb(bci, false);
1093        twl4030_charger_enable_backup(0, 0);
1094
1095        device_remove_file(&bci->usb->dev, &dev_attr_mode);
1096        device_remove_file(&bci->ac->dev, &dev_attr_mode);
1097        /* mask interrupts */
1098        twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1099                         TWL4030_INTERRUPTS_BCIIMR1A);
1100        twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1101                         TWL4030_INTERRUPTS_BCIIMR2A);
1102
1103        return 0;
1104}
1105
1106static const struct of_device_id twl_bci_of_match[] = {
1107        {.compatible = "ti,twl4030-bci", },
1108        { }
1109};
1110MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1111
1112static struct platform_driver twl4030_bci_driver = {
1113        .probe = twl4030_bci_probe,
1114        .remove = twl4030_bci_remove,
1115        .driver = {
1116                .name   = "twl4030_bci",
1117                .of_match_table = of_match_ptr(twl_bci_of_match),
1118        },
1119};
1120module_platform_driver(twl4030_bci_driver);
1121
1122MODULE_AUTHOR("Gražvydas Ignotas");
1123MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1124MODULE_LICENSE("GPL");
1125MODULE_ALIAS("platform:twl4030_bci");
1126