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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * TWL4030/TPS65950 BCI (Battery Charger Interface) driver4 *5 * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>6 *7 * based on twl4030_bci_battery.c by TI8 * Copyright (C) 2008 Texas Instruments, Inc.9 */10 11#include <linux/init.h>12#include <linux/module.h>13#include <linux/slab.h>14#include <linux/err.h>15#include <linux/of.h>16#include <linux/platform_device.h>17#include <linux/interrupt.h>18#include <linux/mfd/twl.h>19#include <linux/power_supply.h>20#include <linux/notifier.h>21#include <linux/usb/otg.h>22#include <linux/iio/consumer.h>23 24#define TWL4030_BCIMDEN 0x0025#define TWL4030_BCIMDKEY 0x0126#define TWL4030_BCIMSTATEC 0x0227#define TWL4030_BCIICHG 0x0828#define TWL4030_BCIVAC 0x0a29#define TWL4030_BCIVBUS 0x0c30#define TWL4030_BCIMFSTS3 0x0F31#define TWL4030_BCIMFSTS4 0x1032#define TWL4030_BCICTL1 0x2333#define TWL4030_BB_CFG 0x1234#define TWL4030_BCIIREF1 0x2735#define TWL4030_BCIIREF2 0x2836#define TWL4030_BCIMFKEY 0x1137#define TWL4030_BCIMFEN3 0x1438#define TWL4030_BCIMFTH8 0x1d39#define TWL4030_BCIMFTH9 0x1e40#define TWL4030_BCIWDKEY 0x2141 42#define TWL4030_BCIMFSTS1 0x0143 44#define TWL4030_BCIAUTOWEN BIT(5)45#define TWL4030_CONFIG_DONE BIT(4)46#define TWL4030_CVENAC BIT(2)47#define TWL4030_BCIAUTOUSB BIT(1)48#define TWL4030_BCIAUTOAC BIT(0)49#define TWL4030_CGAIN BIT(5)50#define TWL4030_USBFASTMCHG BIT(2)51#define TWL4030_STS_VBUS BIT(7)52#define TWL4030_STS_USB_ID BIT(2)53#define TWL4030_BBCHEN BIT(4)54#define TWL4030_BBSEL_MASK 0x0c55#define TWL4030_BBSEL_2V5 0x0056#define TWL4030_BBSEL_3V0 0x0457#define TWL4030_BBSEL_3V1 0x0858#define TWL4030_BBSEL_3V2 0x0c59#define TWL4030_BBISEL_MASK 0x0360#define TWL4030_BBISEL_25uA 0x0061#define TWL4030_BBISEL_150uA 0x0162#define TWL4030_BBISEL_500uA 0x0263#define TWL4030_BBISEL_1000uA 0x0364 65#define TWL4030_BATSTSPCHG BIT(2)66#define TWL4030_BATSTSMCHG BIT(6)67 68/* BCI interrupts */69#define TWL4030_WOVF BIT(0) /* Watchdog overflow */70#define TWL4030_TMOVF BIT(1) /* Timer overflow */71#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */72#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */73#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */74#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */75#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */76#define TWL4030_BATSTS BIT(7) /* Battery status */77 78#define TWL4030_VBATLVL BIT(0) /* VBAT level */79#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */80#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */81#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */82 83#define TWL4030_MSTATEC_USB BIT(4)84#define TWL4030_MSTATEC_AC BIT(5)85#define TWL4030_MSTATEC_MASK 0x0f86#define TWL4030_MSTATEC_QUICK1 0x0287#define TWL4030_MSTATEC_QUICK7 0x0788#define TWL4030_MSTATEC_COMPLETE1 0x0b89#define TWL4030_MSTATEC_COMPLETE4 0x0e90 91/*92 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)93 * then AC is available.94 */95static inline int ac_available(struct iio_channel *channel_vac)96{97 int val, err;98 99 if (!channel_vac)100 return 0;101 102 err = iio_read_channel_processed(channel_vac, &val);103 if (err < 0)104 return 0;105 return val > 4500;106}107 108static bool allow_usb;109module_param(allow_usb, bool, 0644);110MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");111 112struct twl4030_bci {113 struct device *dev;114 struct power_supply *ac;115 struct power_supply *usb;116 struct usb_phy *transceiver;117 struct notifier_block usb_nb;118 struct work_struct work;119 int irq_chg;120 int irq_bci;121 int usb_enabled;122 123 /*124 * ichg_* and *_cur values in uA. If any are 'large', we set125 * CGAIN to '1' which doubles the range for half the126 * precision.127 */128 unsigned int ichg_eoc, ichg_lo, ichg_hi;129 unsigned int usb_cur, ac_cur;130 struct iio_channel *channel_vac;131 bool ac_is_active;132 int usb_mode, ac_mode; /* charging mode requested */133#define CHARGE_OFF 0134#define CHARGE_AUTO 1135#define CHARGE_LINEAR 2136 137 /* When setting the USB current we slowly increase the138 * requested current until target is reached or the voltage139 * drops below 4.75V. In the latter case we step back one140 * step.141 */142 unsigned int usb_cur_target;143 struct delayed_work current_worker;144#define USB_CUR_STEP 20000 /* 20mA at a time */145#define USB_MIN_VOLT 4750000 /* 4.75V */146#define USB_CUR_DELAY msecs_to_jiffies(100)147#define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */148 149 unsigned long event;150};151 152/* strings for 'usb_mode' values */153static const char *modes[] = { "off", "auto", "continuous" };154 155/*156 * clear and set bits on an given register on a given module157 */158static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)159{160 u8 val = 0;161 int ret;162 163 ret = twl_i2c_read_u8(mod_no, &val, reg);164 if (ret)165 return ret;166 167 val &= ~clear;168 val |= set;169 170 return twl_i2c_write_u8(mod_no, val, reg);171}172 173static int twl4030_bci_read(u8 reg, u8 *val)174{175 return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);176}177 178static int twl4030_clear_set_boot_bci(u8 clear, u8 set)179{180 return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,181 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,182 TWL4030_PM_MASTER_BOOT_BCI);183}184 185static int twl4030bci_read_adc_val(u8 reg)186{187 int ret, temp;188 u8 val;189 190 /* read MSB */191 ret = twl4030_bci_read(reg + 1, &val);192 if (ret)193 return ret;194 195 temp = (int)(val & 0x03) << 8;196 197 /* read LSB */198 ret = twl4030_bci_read(reg, &val);199 if (ret)200 return ret;201 202 return temp | val;203}204 205/*206 * TI provided formulas:207 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85208 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7209 * Here we use integer approximation of:210 * CGAIN == 0: val * 1.6618 - 0.85 * 1000211 * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2212 */213/*214 * convert twl register value for currents into uA215 */216static int regval2ua(int regval, bool cgain)217{218 if (cgain)219 return (regval * 16618 - 8500 * 1000) / 5;220 else221 return (regval * 16618 - 8500 * 1000) / 10;222}223 224/*225 * convert uA currents into twl register value226 */227static int ua2regval(int ua, bool cgain)228{229 int ret;230 if (cgain)231 ua /= 2;232 ret = (ua * 10 + 8500 * 1000) / 16618;233 /* rounding problems */234 if (ret < 512)235 ret = 512;236 return ret;237}238 239static int twl4030_charger_update_current(struct twl4030_bci *bci)240{241 int status;242 int cur;243 unsigned reg, cur_reg;244 u8 bcictl1, oldreg, fullreg;245 bool cgain = false;246 u8 boot_bci;247 248 /*249 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)250 * and AC is enabled, set current for 'ac'251 */252 if (ac_available(bci->channel_vac)) {253 cur = bci->ac_cur;254 bci->ac_is_active = true;255 } else {256 cur = bci->usb_cur;257 bci->ac_is_active = false;258 if (cur > bci->usb_cur_target) {259 cur = bci->usb_cur_target;260 bci->usb_cur = cur;261 }262 if (cur < bci->usb_cur_target)263 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);264 }265 266 /* First, check thresholds and see if cgain is needed */267 if (bci->ichg_eoc >= 200000)268 cgain = true;269 if (bci->ichg_lo >= 400000)270 cgain = true;271 if (bci->ichg_hi >= 820000)272 cgain = true;273 if (cur > 852000)274 cgain = true;275 276 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);277 if (status < 0)278 return status;279 if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,280 TWL4030_PM_MASTER_BOOT_BCI) < 0)281 boot_bci = 0;282 boot_bci &= 7;283 284 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))285 /* Need to turn for charging while we change the286 * CGAIN bit. Leave it off while everything is287 * updated.288 */289 twl4030_clear_set_boot_bci(boot_bci, 0);290 291 /*292 * For ichg_eoc, the hardware only supports reg values matching293 * 100XXXX000, and requires the XXXX be stored in the high nibble294 * of TWL4030_BCIMFTH8.295 */296 reg = ua2regval(bci->ichg_eoc, cgain);297 if (reg > 0x278)298 reg = 0x278;299 if (reg < 0x200)300 reg = 0x200;301 reg = (reg >> 3) & 0xf;302 fullreg = reg << 4;303 304 /*305 * For ichg_lo, reg value must match 10XXXX0000.306 * XXXX is stored in low nibble of TWL4030_BCIMFTH8.307 */308 reg = ua2regval(bci->ichg_lo, cgain);309 if (reg > 0x2F0)310 reg = 0x2F0;311 if (reg < 0x200)312 reg = 0x200;313 reg = (reg >> 4) & 0xf;314 fullreg |= reg;315 316 /* ichg_eoc and ichg_lo live in same register */317 status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);318 if (status < 0)319 return status;320 if (oldreg != fullreg) {321 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,322 TWL4030_BCIMFKEY);323 if (status < 0)324 return status;325 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,326 fullreg, TWL4030_BCIMFTH8);327 }328 329 /* ichg_hi threshold must be 1XXXX01100 (I think) */330 reg = ua2regval(bci->ichg_hi, cgain);331 if (reg > 0x3E0)332 reg = 0x3E0;333 if (reg < 0x200)334 reg = 0x200;335 fullreg = (reg >> 5) & 0xF;336 fullreg <<= 4;337 status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);338 if (status < 0)339 return status;340 if ((oldreg & 0xF0) != fullreg) {341 fullreg |= (oldreg & 0x0F);342 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,343 TWL4030_BCIMFKEY);344 if (status < 0)345 return status;346 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,347 fullreg, TWL4030_BCIMFTH9);348 }349 350 /*351 * And finally, set the current. This is stored in352 * two registers.353 */354 reg = ua2regval(cur, cgain);355 /* we have only 10 bits */356 if (reg > 0x3ff)357 reg = 0x3ff;358 status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);359 if (status < 0)360 return status;361 cur_reg = oldreg;362 status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);363 if (status < 0)364 return status;365 cur_reg |= oldreg << 8;366 if (reg != cur_reg) {367 /* disable write protection for one write access for368 * BCIIREF */369 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,370 TWL4030_BCIMFKEY);371 if (status < 0)372 return status;373 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,374 (reg & 0x100) ? 3 : 2,375 TWL4030_BCIIREF2);376 if (status < 0)377 return status;378 /* disable write protection for one write access for379 * BCIIREF */380 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,381 TWL4030_BCIMFKEY);382 if (status < 0)383 return status;384 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,385 reg & 0xff,386 TWL4030_BCIIREF1);387 }388 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {389 /* Flip CGAIN and re-enable charging */390 bcictl1 ^= TWL4030_CGAIN;391 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,392 bcictl1, TWL4030_BCICTL1);393 twl4030_clear_set_boot_bci(0, boot_bci);394 }395 return 0;396}397 398static int twl4030_charger_get_current(void);399 400static void twl4030_current_worker(struct work_struct *data)401{402 int v, curr;403 int res;404 struct twl4030_bci *bci = container_of(data, struct twl4030_bci,405 current_worker.work);406 407 res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);408 if (res < 0)409 v = 0;410 else411 /* BCIVBUS uses ADCIN8, 7/1023 V/step */412 v = res * 6843;413 curr = twl4030_charger_get_current();414 415 dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,416 bci->usb_cur, bci->usb_cur_target);417 418 if (v < USB_MIN_VOLT) {419 /* Back up and stop adjusting. */420 if (bci->usb_cur >= USB_CUR_STEP)421 bci->usb_cur -= USB_CUR_STEP;422 bci->usb_cur_target = bci->usb_cur;423 } else if (bci->usb_cur >= bci->usb_cur_target ||424 bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {425 /* Reached target and voltage is OK - stop */426 return;427 } else {428 bci->usb_cur += USB_CUR_STEP;429 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);430 }431 twl4030_charger_update_current(bci);432}433 434/*435 * Enable/Disable USB Charge functionality.436 */437static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)438{439 int ret;440 u32 reg;441 442 if (bci->usb_mode == CHARGE_OFF)443 enable = false;444 if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {445 446 twl4030_charger_update_current(bci);447 448 /* Need to keep phy powered */449 if (!bci->usb_enabled) {450 pm_runtime_get_sync(bci->transceiver->dev);451 bci->usb_enabled = 1;452 }453 454 if (bci->usb_mode == CHARGE_AUTO) {455 /* Enable interrupts now. */456 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC |457 TWL4030_TBATOR2 | TWL4030_TBATOR1 |458 TWL4030_BATSTS);459 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,460 TWL4030_INTERRUPTS_BCIIMR1A);461 if (ret < 0) {462 dev_err(bci->dev,463 "failed to unmask interrupts: %d\n",464 ret);465 return ret;466 }467 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */468 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);469 }470 471 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */472 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,473 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);474 if (bci->usb_mode == CHARGE_LINEAR) {475 /* Enable interrupts now. */476 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_TBATOR2 |477 TWL4030_TBATOR1 | TWL4030_BATSTS);478 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,479 TWL4030_INTERRUPTS_BCIIMR1A);480 if (ret < 0) {481 dev_err(bci->dev,482 "failed to unmask interrupts: %d\n",483 ret);484 return ret;485 }486 twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);487 /* Watch dog key: WOVF acknowledge */488 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,489 TWL4030_BCIWDKEY);490 /* 0x24 + EKEY6: off mode */491 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,492 TWL4030_BCIMDKEY);493 /* EKEY2: Linear charge: USB path */494 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,495 TWL4030_BCIMDKEY);496 /* WDKEY5: stop watchdog count */497 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,498 TWL4030_BCIWDKEY);499 /* enable MFEN3 access */500 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,501 TWL4030_BCIMFKEY);502 /* ICHGEOCEN - end-of-charge monitor (current < 80mA)503 * (charging continues)504 * ICHGLOWEN - current level monitor (charge continues)505 * don't monitor over-current or heat save506 */507 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,508 TWL4030_BCIMFEN3);509 }510 } else {511 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);512 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,513 TWL4030_BCIMDKEY);514 if (bci->usb_enabled) {515 pm_runtime_mark_last_busy(bci->transceiver->dev);516 pm_runtime_put_autosuspend(bci->transceiver->dev);517 bci->usb_enabled = 0;518 }519 bci->usb_cur = 0;520 }521 522 return ret;523}524 525/*526 * Enable/Disable AC Charge funtionality.527 */528static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)529{530 int ret;531 532 if (bci->ac_mode == CHARGE_OFF)533 enable = false;534 535 if (enable)536 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);537 else538 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);539 540 return ret;541}542 543/*544 * Enable/Disable charging of Backup Battery.545 */546static int twl4030_charger_enable_backup(int uvolt, int uamp)547{548 int ret;549 u8 flags;550 551 if (uvolt < 2500000 ||552 uamp < 25) {553 /* disable charging of backup battery */554 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,555 TWL4030_BBCHEN, 0, TWL4030_BB_CFG);556 return ret;557 }558 559 flags = TWL4030_BBCHEN;560 if (uvolt >= 3200000)561 flags |= TWL4030_BBSEL_3V2;562 else if (uvolt >= 3100000)563 flags |= TWL4030_BBSEL_3V1;564 else if (uvolt >= 3000000)565 flags |= TWL4030_BBSEL_3V0;566 else567 flags |= TWL4030_BBSEL_2V5;568 569 if (uamp >= 1000)570 flags |= TWL4030_BBISEL_1000uA;571 else if (uamp >= 500)572 flags |= TWL4030_BBISEL_500uA;573 else if (uamp >= 150)574 flags |= TWL4030_BBISEL_150uA;575 else576 flags |= TWL4030_BBISEL_25uA;577 578 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,579 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,580 flags,581 TWL4030_BB_CFG);582 583 return ret;584}585 586/*587 * TWL4030 CHG_PRES (AC charger presence) events588 */589static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)590{591 struct twl4030_bci *bci = arg;592 593 dev_dbg(bci->dev, "CHG_PRES irq\n");594 /* reset current on each 'plug' event */595 bci->ac_cur = 500000;596 twl4030_charger_update_current(bci);597 power_supply_changed(bci->ac);598 power_supply_changed(bci->usb);599 600 return IRQ_HANDLED;601}602 603/*604 * TWL4030 BCI monitoring events605 */606static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)607{608 struct twl4030_bci *bci = arg;609 u8 irqs1, irqs2;610 int ret;611 612 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,613 TWL4030_INTERRUPTS_BCIISR1A);614 if (ret < 0)615 return IRQ_HANDLED;616 617 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,618 TWL4030_INTERRUPTS_BCIISR2A);619 if (ret < 0)620 return IRQ_HANDLED;621 622 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);623 624 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {625 /* charger state change, inform the core */626 power_supply_changed(bci->ac);627 power_supply_changed(bci->usb);628 }629 twl4030_charger_update_current(bci);630 631 /* various monitoring events, for now we just log them here */632 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))633 dev_warn(bci->dev, "battery temperature out of range\n");634 635 if (irqs1 & TWL4030_BATSTS)636 dev_crit(bci->dev, "battery disconnected\n");637 638 if (irqs2 & TWL4030_VBATOV)639 dev_crit(bci->dev, "VBAT overvoltage\n");640 641 if (irqs2 & TWL4030_VBUSOV)642 dev_crit(bci->dev, "VBUS overvoltage\n");643 644 if (irqs2 & TWL4030_ACCHGOV)645 dev_crit(bci->dev, "Ac charger overvoltage\n");646 647 return IRQ_HANDLED;648}649 650static void twl4030_bci_usb_work(struct work_struct *data)651{652 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);653 654 switch (bci->event) {655 case USB_EVENT_VBUS:656 case USB_EVENT_CHARGER:657 twl4030_charger_enable_usb(bci, true);658 break;659 case USB_EVENT_NONE:660 twl4030_charger_enable_usb(bci, false);661 break;662 }663}664 665static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,666 void *priv)667{668 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);669 670 dev_dbg(bci->dev, "OTG notify %lu\n", val);671 672 /* reset current on each 'plug' event */673 if (allow_usb)674 bci->usb_cur_target = 500000;675 else676 bci->usb_cur_target = 100000;677 678 bci->event = val;679 schedule_work(&bci->work);680 681 return NOTIFY_OK;682}683 684/*685 * sysfs charger enabled store686 */687static ssize_t688twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,689 const char *buf, size_t n)690{691 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);692 int mode;693 int status;694 695 mode = sysfs_match_string(modes, buf);696 if (mode < 0)697 return mode;698 699 if (dev == &bci->ac->dev) {700 if (mode == 2)701 return -EINVAL;702 twl4030_charger_enable_ac(bci, false);703 bci->ac_mode = mode;704 status = twl4030_charger_enable_ac(bci, true);705 } else {706 twl4030_charger_enable_usb(bci, false);707 bci->usb_mode = mode;708 status = twl4030_charger_enable_usb(bci, true);709 }710 return (status == 0) ? n : status;711}712 713/*714 * sysfs charger enabled show715 */716static ssize_t717twl4030_bci_mode_show(struct device *dev,718 struct device_attribute *attr, char *buf)719{720 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);721 int len = 0;722 int i;723 int mode = bci->usb_mode;724 725 if (dev == &bci->ac->dev)726 mode = bci->ac_mode;727 728 for (i = 0; i < ARRAY_SIZE(modes); i++)729 if (mode == i)730 len += sysfs_emit_at(buf, len, "[%s] ", modes[i]);731 else732 len += sysfs_emit_at(buf, len, "%s ", modes[i]);733 buf[len-1] = '\n';734 return len;735}736static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,737 twl4030_bci_mode_store);738 739static int twl4030_charger_get_current(void)740{741 int curr;742 int ret;743 u8 bcictl1;744 745 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);746 if (curr < 0)747 return curr;748 749 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);750 if (ret)751 return ret;752 753 return regval2ua(curr, bcictl1 & TWL4030_CGAIN);754}755 756/*757 * Returns the main charge FSM state758 * Or < 0 on failure.759 */760static int twl4030bci_state(struct twl4030_bci *bci)761{762 int ret;763 u8 state;764 765 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);766 if (ret) {767 dev_err(bci->dev, "error reading BCIMSTATEC\n");768 return ret;769 }770 771 dev_dbg(bci->dev, "state: %02x\n", state);772 773 return state;774}775 776static int twl4030_bci_state_to_status(int state)777{778 state &= TWL4030_MSTATEC_MASK;779 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)780 return POWER_SUPPLY_STATUS_CHARGING;781 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&782 state <= TWL4030_MSTATEC_COMPLETE4)783 return POWER_SUPPLY_STATUS_FULL;784 else785 return POWER_SUPPLY_STATUS_NOT_CHARGING;786}787 788static int twl4030_bci_get_property(struct power_supply *psy,789 enum power_supply_property psp,790 union power_supply_propval *val)791{792 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);793 int is_charging;794 int state;795 int ret;796 797 state = twl4030bci_state(bci);798 if (state < 0)799 return state;800 801 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)802 is_charging = state & TWL4030_MSTATEC_USB;803 else804 is_charging = state & TWL4030_MSTATEC_AC;805 if (!is_charging) {806 u8 s;807 ret = twl4030_bci_read(TWL4030_BCIMDEN, &s);808 if (ret < 0)809 return ret;810 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)811 is_charging = s & 1;812 else813 is_charging = s & 2;814 if (is_charging)815 /* A little white lie */816 state = TWL4030_MSTATEC_QUICK1;817 }818 819 switch (psp) {820 case POWER_SUPPLY_PROP_STATUS:821 if (is_charging)822 val->intval = twl4030_bci_state_to_status(state);823 else824 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;825 break;826 case POWER_SUPPLY_PROP_VOLTAGE_NOW:827 /* charging must be active for meaningful result */828 if (!is_charging)829 return -ENODATA;830 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {831 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);832 if (ret < 0)833 return ret;834 /* BCIVBUS uses ADCIN8, 7/1023 V/step */835 val->intval = ret * 6843;836 } else {837 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);838 if (ret < 0)839 return ret;840 /* BCIVAC uses ADCIN11, 10/1023 V/step */841 val->intval = ret * 9775;842 }843 break;844 case POWER_SUPPLY_PROP_CURRENT_NOW:845 if (!is_charging)846 return -ENODATA;847 /* current measurement is shared between AC and USB */848 ret = twl4030_charger_get_current();849 if (ret < 0)850 return ret;851 val->intval = ret;852 break;853 case POWER_SUPPLY_PROP_ONLINE:854 val->intval = is_charging &&855 twl4030_bci_state_to_status(state) !=856 POWER_SUPPLY_STATUS_NOT_CHARGING;857 break;858 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:859 val->intval = -1;860 if (psy->desc->type != POWER_SUPPLY_TYPE_USB) {861 if (!bci->ac_is_active)862 val->intval = bci->ac_cur;863 } else {864 if (bci->ac_is_active)865 val->intval = bci->usb_cur_target;866 }867 if (val->intval < 0) {868 u8 bcictl1;869 870 val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1);871 if (val->intval < 0)872 return val->intval;873 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);874 if (ret < 0)875 return ret;876 val->intval = regval2ua(val->intval, bcictl1 &877 TWL4030_CGAIN);878 }879 break;880 default:881 return -EINVAL;882 }883 884 return 0;885}886 887static int twl4030_bci_set_property(struct power_supply *psy,888 enum power_supply_property psp,889 const union power_supply_propval *val)890{891 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);892 893 switch (psp) {894 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:895 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)896 bci->usb_cur_target = val->intval;897 else898 bci->ac_cur = val->intval;899 twl4030_charger_update_current(bci);900 break;901 default:902 return -EINVAL;903 }904 905 return 0;906}907 908static int twl4030_bci_property_is_writeable(struct power_supply *psy,909 enum power_supply_property psp)910{911 switch (psp) {912 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:913 return true;914 default:915 return false;916 }917}918 919static enum power_supply_property twl4030_charger_props[] = {920 POWER_SUPPLY_PROP_STATUS,921 POWER_SUPPLY_PROP_ONLINE,922 POWER_SUPPLY_PROP_VOLTAGE_NOW,923 POWER_SUPPLY_PROP_CURRENT_NOW,924 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,925};926 927#ifdef CONFIG_OF928static const struct twl4030_bci_platform_data *929twl4030_bci_parse_dt(struct device *dev)930{931 struct device_node *np = dev->of_node;932 struct twl4030_bci_platform_data *pdata;933 u32 num;934 935 if (!np)936 return NULL;937 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);938 if (!pdata)939 return pdata;940 941 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)942 pdata->bb_uvolt = num;943 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)944 pdata->bb_uamp = num;945 return pdata;946}947#else948static inline const struct twl4030_bci_platform_data *949twl4030_bci_parse_dt(struct device *dev)950{951 return NULL;952}953#endif954 955static const struct power_supply_desc twl4030_bci_ac_desc = {956 .name = "twl4030_ac",957 .type = POWER_SUPPLY_TYPE_MAINS,958 .properties = twl4030_charger_props,959 .num_properties = ARRAY_SIZE(twl4030_charger_props),960 .get_property = twl4030_bci_get_property,961 .set_property = twl4030_bci_set_property,962 .property_is_writeable = twl4030_bci_property_is_writeable,963};964 965static const struct power_supply_desc twl4030_bci_usb_desc = {966 .name = "twl4030_usb",967 .type = POWER_SUPPLY_TYPE_USB,968 .properties = twl4030_charger_props,969 .num_properties = ARRAY_SIZE(twl4030_charger_props),970 .get_property = twl4030_bci_get_property,971 .set_property = twl4030_bci_set_property,972 .property_is_writeable = twl4030_bci_property_is_writeable,973};974 975static int twl4030_bci_probe(struct platform_device *pdev)976{977 struct twl4030_bci *bci;978 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;979 int ret;980 u32 reg;981 982 bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);983 if (bci == NULL)984 return -ENOMEM;985 986 if (!pdata)987 pdata = twl4030_bci_parse_dt(&pdev->dev);988 989 bci->ichg_eoc = 80100; /* Stop charging when current drops to here */990 bci->ichg_lo = 241000; /* Low threshold */991 bci->ichg_hi = 500000; /* High threshold */992 bci->ac_cur = 500000; /* 500mA */993 if (allow_usb)994 bci->usb_cur_target = 500000; /* 500mA */995 else996 bci->usb_cur_target = 100000; /* 100mA */997 bci->usb_mode = CHARGE_AUTO;998 bci->ac_mode = CHARGE_AUTO;999 1000 bci->dev = &pdev->dev;1001 bci->irq_chg = platform_get_irq(pdev, 0);1002 bci->irq_bci = platform_get_irq(pdev, 1);1003 1004 platform_set_drvdata(pdev, bci);1005 1006 INIT_WORK(&bci->work, twl4030_bci_usb_work);1007 INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);1008 1009 bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");1010 if (IS_ERR(bci->channel_vac)) {1011 ret = PTR_ERR(bci->channel_vac);1012 if (ret == -EPROBE_DEFER)1013 return ret; /* iio not ready */1014 dev_warn(&pdev->dev, "could not request vac iio channel (%d)",1015 ret);1016 bci->channel_vac = NULL;1017 }1018 1019 if (bci->dev->of_node) {1020 struct device_node *phynode;1021 1022 phynode = of_get_compatible_child(bci->dev->of_node->parent,1023 "ti,twl4030-usb");1024 if (phynode) {1025 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;1026 bci->transceiver = devm_usb_get_phy_by_node(1027 bci->dev, phynode, &bci->usb_nb);1028 of_node_put(phynode);1029 if (IS_ERR(bci->transceiver)) {1030 ret = PTR_ERR(bci->transceiver);1031 if (ret == -EPROBE_DEFER)1032 return ret; /* phy not ready */1033 dev_warn(&pdev->dev, "could not request transceiver (%d)",1034 ret);1035 bci->transceiver = NULL;1036 }1037 }1038 }1039 1040 bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,1041 NULL);1042 if (IS_ERR(bci->ac)) {1043 ret = PTR_ERR(bci->ac);1044 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);1045 return ret;1046 }1047 1048 bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,1049 NULL);1050 if (IS_ERR(bci->usb)) {1051 ret = PTR_ERR(bci->usb);1052 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);1053 return ret;1054 }1055 1056 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,1057 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,1058 bci);1059 if (ret < 0) {1060 dev_err(&pdev->dev, "could not request irq %d, status %d\n",1061 bci->irq_chg, ret);1062 return ret;1063 }1064 1065 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,1066 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);1067 if (ret < 0) {1068 dev_err(&pdev->dev, "could not request irq %d, status %d\n",1069 bci->irq_bci, ret);1070 return ret;1071 }1072 1073 /* Enable interrupts now. */1074 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |1075 TWL4030_TBATOR1 | TWL4030_BATSTS);1076 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,1077 TWL4030_INTERRUPTS_BCIIMR1A);1078 if (ret < 0) {1079 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);1080 return ret;1081 }1082 1083 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);1084 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,1085 TWL4030_INTERRUPTS_BCIIMR2A);1086 if (ret < 0)1087 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);1088 1089 twl4030_charger_update_current(bci);1090 if (device_create_file(&bci->usb->dev, &dev_attr_mode))1091 dev_warn(&pdev->dev, "could not create sysfs file\n");1092 if (device_create_file(&bci->ac->dev, &dev_attr_mode))1093 dev_warn(&pdev->dev, "could not create sysfs file\n");1094 1095 twl4030_charger_enable_ac(bci, true);1096 if (!IS_ERR_OR_NULL(bci->transceiver))1097 twl4030_bci_usb_ncb(&bci->usb_nb,1098 bci->transceiver->last_event,1099 NULL);1100 else1101 twl4030_charger_enable_usb(bci, false);1102 if (pdata)1103 twl4030_charger_enable_backup(pdata->bb_uvolt,1104 pdata->bb_uamp);1105 else1106 twl4030_charger_enable_backup(0, 0);1107 1108 return 0;1109}1110 1111static void twl4030_bci_remove(struct platform_device *pdev)1112{1113 struct twl4030_bci *bci = platform_get_drvdata(pdev);1114 1115 twl4030_charger_enable_ac(bci, false);1116 twl4030_charger_enable_usb(bci, false);1117 twl4030_charger_enable_backup(0, 0);1118 1119 device_remove_file(&bci->usb->dev, &dev_attr_mode);1120 device_remove_file(&bci->ac->dev, &dev_attr_mode);1121 /* mask interrupts */1122 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,1123 TWL4030_INTERRUPTS_BCIIMR1A);1124 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,1125 TWL4030_INTERRUPTS_BCIIMR2A);1126}1127 1128static const struct of_device_id twl_bci_of_match[] __maybe_unused = {1129 {.compatible = "ti,twl4030-bci", },1130 { }1131};1132MODULE_DEVICE_TABLE(of, twl_bci_of_match);1133 1134static struct platform_driver twl4030_bci_driver = {1135 .probe = twl4030_bci_probe,1136 .remove_new = twl4030_bci_remove,1137 .driver = {1138 .name = "twl4030_bci",1139 .of_match_table = of_match_ptr(twl_bci_of_match),1140 },1141};1142module_platform_driver(twl4030_bci_driver);1143 1144MODULE_AUTHOR("Gražvydas Ignotas");1145MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");1146MODULE_LICENSE("GPL");1147MODULE_ALIAS("platform:twl4030_bci");1148