1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Motorola CPCAP PMIC battery charger driver 4 * 5 * Copyright (C) 2017 Tony Lindgren <tony@atomide.com> 6 * 7 * Rewritten for Linux power framework with some parts based on 8 * earlier driver found in the Motorola Linux kernel: 9 * 10 * Copyright (C) 2009-2010 Motorola, Inc. 11 */ 12 13 #include <linux/atomic.h> 14 #include <linux/init.h> 15 #include <linux/module.h> 16 #include <linux/slab.h> 17 #include <linux/string_choices.h> 18 #include <linux/err.h> 19 #include <linux/interrupt.h> 20 #include <linux/notifier.h> 21 #include <linux/mod_devicetable.h> 22 #include <linux/platform_device.h> 23 #include <linux/power_supply.h> 24 #include <linux/property.h> 25 #include <linux/regmap.h> 26 27 #include <linux/gpio/consumer.h> 28 #include <linux/usb/phy_companion.h> 29 #include <linux/phy/omap_usb.h> 30 #include <linux/usb/otg.h> 31 #include <linux/iio/consumer.h> 32 #include <linux/mfd/motorola-cpcap.h> 33 34 /* 35 * CPCAP_REG_CRM register bits. For documentation of somewhat similar hardware, 36 * see NXP "MC13783 Power Management and Audio Circuit Users's Guide" 37 * MC13783UG.pdf chapter "8.5 Battery Interface Register Summary". The registers 38 * and values for CPCAP are different, but some of the internal components seem 39 * similar. Also see the Motorola Linux kernel cpcap-regbits.h. CPCAP_REG_CHRGR_1 40 * bits that seem to describe the CRM register. 41 */ 42 #define CPCAP_REG_CRM_UNUSED_641_15 BIT(15) /* 641 = register number */ 43 #define CPCAP_REG_CRM_UNUSED_641_14 BIT(14) /* 641 = register number */ 44 #define CPCAP_REG_CRM_CHRG_LED_EN BIT(13) /* Charger LED */ 45 #define CPCAP_REG_CRM_RVRSMODE BIT(12) /* USB VBUS output enable */ 46 #define CPCAP_REG_CRM_ICHRG_TR1 BIT(11) /* Trickle charge current */ 47 #define CPCAP_REG_CRM_ICHRG_TR0 BIT(10) 48 #define CPCAP_REG_CRM_FET_OVRD BIT(9) /* 0 = hardware, 1 = FET_CTRL */ 49 #define CPCAP_REG_CRM_FET_CTRL BIT(8) /* BPFET 1 if FET_OVRD set */ 50 #define CPCAP_REG_CRM_VCHRG3 BIT(7) /* Charge voltage bits */ 51 #define CPCAP_REG_CRM_VCHRG2 BIT(6) 52 #define CPCAP_REG_CRM_VCHRG1 BIT(5) 53 #define CPCAP_REG_CRM_VCHRG0 BIT(4) 54 #define CPCAP_REG_CRM_ICHRG3 BIT(3) /* Charge current bits */ 55 #define CPCAP_REG_CRM_ICHRG2 BIT(2) 56 #define CPCAP_REG_CRM_ICHRG1 BIT(1) 57 #define CPCAP_REG_CRM_ICHRG0 BIT(0) 58 59 /* CPCAP_REG_CRM trickle charge voltages */ 60 #define CPCAP_REG_CRM_TR(val) (((val) & 0x3) << 10) 61 #define CPCAP_REG_CRM_TR_0A00 CPCAP_REG_CRM_TR(0x0) 62 #define CPCAP_REG_CRM_TR_0A24 CPCAP_REG_CRM_TR(0x1) 63 #define CPCAP_REG_CRM_TR_0A48 CPCAP_REG_CRM_TR(0x2) 64 #define CPCAP_REG_CRM_TR_0A72 CPCAP_REG_CRM_TR(0x4) 65 66 /* 67 * CPCAP_REG_CRM charge voltages based on the ADC channel 1 values. 68 * Note that these register bits don't match MC13783UG.pdf VCHRG 69 * register bits. 70 */ 71 #define CPCAP_REG_CRM_VCHRG(val) (((val) & 0xf) << 4) 72 #define CPCAP_REG_CRM_VCHRG_3V80 CPCAP_REG_CRM_VCHRG(0x0) 73 #define CPCAP_REG_CRM_VCHRG_4V10 CPCAP_REG_CRM_VCHRG(0x1) 74 #define CPCAP_REG_CRM_VCHRG_4V12 CPCAP_REG_CRM_VCHRG(0x2) 75 #define CPCAP_REG_CRM_VCHRG_4V15 CPCAP_REG_CRM_VCHRG(0x3) 76 #define CPCAP_REG_CRM_VCHRG_4V17 CPCAP_REG_CRM_VCHRG(0x4) 77 #define CPCAP_REG_CRM_VCHRG_4V20 CPCAP_REG_CRM_VCHRG(0x5) 78 #define CPCAP_REG_CRM_VCHRG_4V23 CPCAP_REG_CRM_VCHRG(0x6) 79 #define CPCAP_REG_CRM_VCHRG_4V25 CPCAP_REG_CRM_VCHRG(0x7) 80 #define CPCAP_REG_CRM_VCHRG_4V27 CPCAP_REG_CRM_VCHRG(0x8) 81 #define CPCAP_REG_CRM_VCHRG_4V30 CPCAP_REG_CRM_VCHRG(0x9) 82 #define CPCAP_REG_CRM_VCHRG_4V33 CPCAP_REG_CRM_VCHRG(0xa) 83 #define CPCAP_REG_CRM_VCHRG_4V35 CPCAP_REG_CRM_VCHRG(0xb) 84 #define CPCAP_REG_CRM_VCHRG_4V38 CPCAP_REG_CRM_VCHRG(0xc) 85 #define CPCAP_REG_CRM_VCHRG_4V40 CPCAP_REG_CRM_VCHRG(0xd) 86 #define CPCAP_REG_CRM_VCHRG_4V42 CPCAP_REG_CRM_VCHRG(0xe) 87 #define CPCAP_REG_CRM_VCHRG_4V44 CPCAP_REG_CRM_VCHRG(0xf) 88 89 /* 90 * CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf 91 * values in "Table 8-3. Charge Path Regulator Current Limit 92 * Characteristics" for the nominal values. 93 * 94 * Except 70mA and 1.596A and unlimited, these are simply 88.7mA / step. 95 */ 96 #define CPCAP_REG_CRM_ICHRG(val) (((val) & 0xf) << 0) 97 #define CPCAP_REG_CRM_ICHRG_0A000 CPCAP_REG_CRM_ICHRG(0x0) 98 #define CPCAP_REG_CRM_ICHRG_0A070 CPCAP_REG_CRM_ICHRG(0x1) 99 #define CPCAP_REG_CRM_ICHRG_0A177 CPCAP_REG_CRM_ICHRG(0x2) 100 #define CPCAP_REG_CRM_ICHRG_0A266 CPCAP_REG_CRM_ICHRG(0x3) 101 #define CPCAP_REG_CRM_ICHRG_0A355 CPCAP_REG_CRM_ICHRG(0x4) 102 #define CPCAP_REG_CRM_ICHRG_0A443 CPCAP_REG_CRM_ICHRG(0x5) 103 #define CPCAP_REG_CRM_ICHRG_0A532 CPCAP_REG_CRM_ICHRG(0x6) 104 #define CPCAP_REG_CRM_ICHRG_0A621 CPCAP_REG_CRM_ICHRG(0x7) 105 #define CPCAP_REG_CRM_ICHRG_0A709 CPCAP_REG_CRM_ICHRG(0x8) 106 #define CPCAP_REG_CRM_ICHRG_0A798 CPCAP_REG_CRM_ICHRG(0x9) 107 #define CPCAP_REG_CRM_ICHRG_0A886 CPCAP_REG_CRM_ICHRG(0xa) 108 #define CPCAP_REG_CRM_ICHRG_0A975 CPCAP_REG_CRM_ICHRG(0xb) 109 #define CPCAP_REG_CRM_ICHRG_1A064 CPCAP_REG_CRM_ICHRG(0xc) 110 #define CPCAP_REG_CRM_ICHRG_1A152 CPCAP_REG_CRM_ICHRG(0xd) 111 #define CPCAP_REG_CRM_ICHRG_1A596 CPCAP_REG_CRM_ICHRG(0xe) 112 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT CPCAP_REG_CRM_ICHRG(0xf) 113 114 /* CPCAP_REG_VUSBC register bits needed for VBUS */ 115 #define CPCAP_BIT_VBUS_SWITCH BIT(0) /* VBUS boost to 5V */ 116 117 enum { 118 CPCAP_CHARGER_IIO_BATTDET, 119 CPCAP_CHARGER_IIO_VOLTAGE, 120 CPCAP_CHARGER_IIO_VBUS, 121 CPCAP_CHARGER_IIO_CHRG_CURRENT, 122 CPCAP_CHARGER_IIO_BATT_CURRENT, 123 CPCAP_CHARGER_IIO_NR, 124 }; 125 126 struct cpcap_charger_ddata { 127 struct device *dev; 128 struct regmap *reg; 129 struct list_head irq_list; 130 struct delayed_work detect_work; 131 struct delayed_work vbus_work; 132 struct gpio_desc *gpio[2]; /* gpio_reven0 & 1 */ 133 134 struct iio_channel *channels[CPCAP_CHARGER_IIO_NR]; 135 136 struct power_supply *usb; 137 138 struct phy_companion comparator; /* For USB VBUS */ 139 unsigned int vbus_enabled:1; 140 unsigned int feeding_vbus:1; 141 atomic_t active; 142 143 int status; 144 int voltage; 145 int limit_current; 146 }; 147 148 struct cpcap_interrupt_desc { 149 int irq; 150 struct list_head node; 151 const char *name; 152 }; 153 154 struct cpcap_charger_ints_state { 155 bool chrg_det; 156 bool rvrs_chrg; 157 bool vbusov; 158 159 bool chrg_se1b; 160 bool rvrs_mode; 161 bool chrgcurr2; 162 bool chrgcurr1; 163 bool vbusvld; 164 165 bool battdetb; 166 }; 167 168 static enum power_supply_property cpcap_charger_props[] = { 169 POWER_SUPPLY_PROP_STATUS, 170 POWER_SUPPLY_PROP_ONLINE, 171 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, 172 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, 173 POWER_SUPPLY_PROP_VOLTAGE_NOW, 174 POWER_SUPPLY_PROP_CURRENT_NOW, 175 }; 176 177 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata) 178 { 179 struct iio_channel *channel; 180 int error, value = 0; 181 182 channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE]; 183 error = iio_read_channel_processed(channel, &value); 184 if (error < 0) { 185 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error); 186 187 return 0; 188 } 189 190 return value; 191 } 192 193 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata) 194 { 195 struct iio_channel *channel; 196 int error, value = 0; 197 198 channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT]; 199 error = iio_read_channel_processed(channel, &value); 200 if (error < 0) { 201 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error); 202 203 return 0; 204 } 205 206 return value; 207 } 208 209 static int cpcap_charger_get_property(struct power_supply *psy, 210 enum power_supply_property psp, 211 union power_supply_propval *val) 212 { 213 struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent); 214 215 switch (psp) { 216 case POWER_SUPPLY_PROP_STATUS: 217 val->intval = ddata->status; 218 break; 219 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 220 val->intval = ddata->limit_current; 221 break; 222 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: 223 val->intval = ddata->voltage; 224 break; 225 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 226 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING) 227 val->intval = cpcap_charger_get_charge_voltage(ddata) * 228 1000; 229 else 230 val->intval = 0; 231 break; 232 case POWER_SUPPLY_PROP_CURRENT_NOW: 233 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING) 234 val->intval = cpcap_charger_get_charge_current(ddata) * 235 1000; 236 else 237 val->intval = 0; 238 break; 239 case POWER_SUPPLY_PROP_ONLINE: 240 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING; 241 break; 242 default: 243 return -EINVAL; 244 } 245 246 return 0; 247 } 248 249 static int cpcap_charger_match_voltage(int voltage) 250 { 251 switch (voltage) { 252 case 0 ... 4100000 - 1: return 3800000; 253 case 4100000 ... 4120000 - 1: return 4100000; 254 case 4120000 ... 4150000 - 1: return 4120000; 255 case 4150000 ... 4170000 - 1: return 4150000; 256 case 4170000 ... 4200000 - 1: return 4170000; 257 case 4200000 ... 4230000 - 1: return 4200000; 258 case 4230000 ... 4250000 - 1: return 4230000; 259 case 4250000 ... 4270000 - 1: return 4250000; 260 case 4270000 ... 4300000 - 1: return 4270000; 261 case 4300000 ... 4330000 - 1: return 4300000; 262 case 4330000 ... 4350000 - 1: return 4330000; 263 case 4350000 ... 4380000 - 1: return 4350000; 264 case 4380000 ... 4400000 - 1: return 4380000; 265 case 4400000 ... 4420000 - 1: return 4400000; 266 case 4420000 ... 4440000 - 1: return 4420000; 267 case 4440000: return 4440000; 268 default: return 0; 269 } 270 } 271 272 static int 273 cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata) 274 { 275 union power_supply_propval prop; 276 struct power_supply *battery; 277 int voltage = ddata->voltage; 278 int error; 279 280 battery = power_supply_get_by_name("battery"); 281 if (battery) { 282 error = power_supply_get_property(battery, 283 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, 284 &prop); 285 if (!error) 286 voltage = prop.intval; 287 288 power_supply_put(battery); 289 } 290 291 return voltage; 292 } 293 294 static int cpcap_charger_current_to_regval(int microamp) 295 { 296 int miliamp = microamp / 1000; 297 int res; 298 299 if (miliamp < 0) 300 return -EINVAL; 301 if (miliamp < 70) 302 return CPCAP_REG_CRM_ICHRG(0x0); 303 if (miliamp < 177) 304 return CPCAP_REG_CRM_ICHRG(0x1); 305 if (miliamp >= 1596) 306 return CPCAP_REG_CRM_ICHRG(0xe); 307 308 res = microamp / 88666; 309 if (res > 0xd) 310 res = 0xd; 311 return CPCAP_REG_CRM_ICHRG(res); 312 } 313 314 static int cpcap_charger_set_property(struct power_supply *psy, 315 enum power_supply_property psp, 316 const union power_supply_propval *val) 317 { 318 struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent); 319 int voltage, batvolt; 320 321 switch (psp) { 322 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 323 if (cpcap_charger_current_to_regval(val->intval) < 0) 324 return -EINVAL; 325 ddata->limit_current = val->intval; 326 schedule_delayed_work(&ddata->detect_work, 0); 327 break; 328 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: 329 voltage = cpcap_charger_match_voltage(val->intval); 330 batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata); 331 if (voltage > batvolt) 332 voltage = batvolt; 333 ddata->voltage = voltage; 334 schedule_delayed_work(&ddata->detect_work, 0); 335 break; 336 default: 337 return -EINVAL; 338 } 339 340 return 0; 341 } 342 343 static int cpcap_charger_property_is_writeable(struct power_supply *psy, 344 enum power_supply_property psp) 345 { 346 switch (psp) { 347 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 348 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: 349 return 1; 350 default: 351 return 0; 352 } 353 } 354 355 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata, 356 bool enabled) 357 { 358 if (!ddata->gpio[0]) 359 return; 360 361 gpiod_set_value(ddata->gpio[0], enabled); 362 } 363 364 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata, 365 bool enabled) 366 { 367 if (!ddata->gpio[1]) 368 return; 369 370 gpiod_set_value(ddata->gpio[1], enabled); 371 } 372 373 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata, 374 int state) 375 { 376 const char *status; 377 378 if (state > POWER_SUPPLY_STATUS_FULL) { 379 dev_warn(ddata->dev, "unknown state: %i\n", state); 380 381 return; 382 } 383 384 ddata->status = state; 385 386 switch (state) { 387 case POWER_SUPPLY_STATUS_DISCHARGING: 388 status = "DISCONNECTED"; 389 break; 390 case POWER_SUPPLY_STATUS_NOT_CHARGING: 391 status = "DETECTING"; 392 break; 393 case POWER_SUPPLY_STATUS_CHARGING: 394 status = "CHARGING"; 395 break; 396 case POWER_SUPPLY_STATUS_FULL: 397 status = "DONE"; 398 break; 399 default: 400 return; 401 } 402 403 dev_dbg(ddata->dev, "state: %s\n", status); 404 } 405 406 static int cpcap_charger_disable(struct cpcap_charger_ddata *ddata) 407 { 408 int error; 409 410 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff, 411 CPCAP_REG_CRM_FET_OVRD | 412 CPCAP_REG_CRM_FET_CTRL); 413 if (error) 414 dev_err(ddata->dev, "%s failed with %i\n", __func__, error); 415 416 return error; 417 } 418 419 static int cpcap_charger_enable(struct cpcap_charger_ddata *ddata, 420 int max_voltage, int charge_current, 421 int trickle_current) 422 { 423 int error; 424 425 if (!max_voltage || !charge_current) 426 return -EINVAL; 427 428 dev_dbg(ddata->dev, "enable: %i %i %i\n", 429 max_voltage, charge_current, trickle_current); 430 431 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff, 432 CPCAP_REG_CRM_CHRG_LED_EN | 433 trickle_current | 434 CPCAP_REG_CRM_FET_OVRD | 435 CPCAP_REG_CRM_FET_CTRL | 436 max_voltage | 437 charge_current); 438 if (error) 439 dev_err(ddata->dev, "%s failed with %i\n", __func__, error); 440 441 return error; 442 } 443 444 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata) 445 { 446 int error, value = 0; 447 struct iio_channel *channel = 448 ddata->channels[CPCAP_CHARGER_IIO_VBUS]; 449 450 error = iio_read_channel_processed(channel, &value); 451 if (error >= 0) 452 return value > 3900; 453 454 dev_err(ddata->dev, "error reading VBUS: %i\n", error); 455 456 return false; 457 } 458 459 /* VBUS control functions for the USB PHY companion */ 460 static void cpcap_charger_vbus_work(struct work_struct *work) 461 { 462 struct cpcap_charger_ddata *ddata; 463 bool vbus = false; 464 int error; 465 466 ddata = container_of(work, struct cpcap_charger_ddata, 467 vbus_work.work); 468 469 if (ddata->vbus_enabled) { 470 vbus = cpcap_charger_vbus_valid(ddata); 471 if (vbus) { 472 dev_dbg(ddata->dev, "VBUS already provided\n"); 473 474 return; 475 } 476 477 ddata->feeding_vbus = true; 478 cpcap_charger_set_cable_path(ddata, false); 479 cpcap_charger_set_inductive_path(ddata, false); 480 481 error = cpcap_charger_disable(ddata); 482 if (error) 483 goto out_err; 484 485 cpcap_charger_update_state(ddata, 486 POWER_SUPPLY_STATUS_DISCHARGING); 487 488 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC, 489 CPCAP_BIT_VBUS_SWITCH, 490 CPCAP_BIT_VBUS_SWITCH); 491 if (error) 492 goto out_err; 493 494 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 495 CPCAP_REG_CRM_RVRSMODE, 496 CPCAP_REG_CRM_RVRSMODE); 497 if (error) 498 goto out_err; 499 } else { 500 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC, 501 CPCAP_BIT_VBUS_SWITCH, 0); 502 if (error) 503 goto out_err; 504 505 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 506 CPCAP_REG_CRM_RVRSMODE, 0); 507 if (error) 508 goto out_err; 509 510 cpcap_charger_set_cable_path(ddata, true); 511 cpcap_charger_set_inductive_path(ddata, true); 512 ddata->feeding_vbus = false; 513 } 514 515 return; 516 517 out_err: 518 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN); 519 dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__, 520 str_enable_disable(ddata->vbus_enabled), error); 521 } 522 523 static int cpcap_charger_set_vbus(struct phy_companion *comparator, 524 bool enabled) 525 { 526 struct cpcap_charger_ddata *ddata = 527 container_of(comparator, struct cpcap_charger_ddata, 528 comparator); 529 530 ddata->vbus_enabled = enabled; 531 schedule_delayed_work(&ddata->vbus_work, 0); 532 533 return 0; 534 } 535 536 /* Charger interrupt handling functions */ 537 538 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata, 539 struct cpcap_charger_ints_state *s) 540 { 541 int val, error; 542 543 error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val); 544 if (error) 545 return error; 546 547 s->chrg_det = val & BIT(13); 548 s->rvrs_chrg = val & BIT(12); 549 s->vbusov = val & BIT(11); 550 551 error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val); 552 if (error) 553 return error; 554 555 s->chrg_se1b = val & BIT(13); 556 s->rvrs_mode = val & BIT(6); 557 s->chrgcurr2 = val & BIT(5); 558 s->chrgcurr1 = val & BIT(4); 559 s->vbusvld = val & BIT(3); 560 561 error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val); 562 if (error) 563 return error; 564 565 s->battdetb = val & BIT(6); 566 567 return 0; 568 } 569 570 static int cpcap_charger_voltage_to_regval(int voltage) 571 { 572 int offset; 573 574 switch (voltage) { 575 case 0 ... 4100000 - 1: 576 return 0; 577 case 4100000 ... 4200000 - 1: 578 offset = 1; 579 break; 580 case 4200000 ... 4300000 - 1: 581 offset = 0; 582 break; 583 case 4300000 ... 4380000 - 1: 584 offset = -1; 585 break; 586 case 4380000 ... 4440000: 587 offset = -2; 588 break; 589 default: 590 return 0; 591 } 592 593 return ((voltage - 4100000) / 20000) + offset; 594 } 595 596 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata, 597 int state, unsigned long delay) 598 { 599 int error; 600 601 /* Update battery state before disconnecting the charger */ 602 switch (state) { 603 case POWER_SUPPLY_STATUS_DISCHARGING: 604 case POWER_SUPPLY_STATUS_FULL: 605 power_supply_changed(ddata->usb); 606 break; 607 default: 608 break; 609 } 610 611 error = cpcap_charger_disable(ddata); 612 if (error) { 613 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN); 614 return; 615 } 616 617 cpcap_charger_update_state(ddata, state); 618 power_supply_changed(ddata->usb); 619 schedule_delayed_work(&ddata->detect_work, delay); 620 } 621 622 static void cpcap_usb_detect(struct work_struct *work) 623 { 624 struct cpcap_charger_ddata *ddata; 625 struct cpcap_charger_ints_state s; 626 int error, new_state; 627 628 ddata = container_of(work, struct cpcap_charger_ddata, 629 detect_work.work); 630 631 error = cpcap_charger_get_ints_state(ddata, &s); 632 if (error) 633 return; 634 635 /* Just init the state if a charger is connected with no chrg_det set */ 636 if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) { 637 cpcap_charger_update_state(ddata, 638 POWER_SUPPLY_STATUS_NOT_CHARGING); 639 640 return; 641 } 642 643 /* 644 * If battery voltage is higher than charge voltage, it may have been 645 * charged to 4.35V by Android. Try again in 10 minutes. 646 */ 647 if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) { 648 cpcap_charger_disconnect(ddata, 649 POWER_SUPPLY_STATUS_NOT_CHARGING, 650 HZ * 60 * 10); 651 652 return; 653 } 654 655 /* Delay for 80ms to avoid vbus bouncing when usb cable is plugged in */ 656 usleep_range(80000, 120000); 657 658 /* Throttle chrgcurr2 interrupt for charger done and retry */ 659 switch (ddata->status) { 660 case POWER_SUPPLY_STATUS_CHARGING: 661 if (s.chrgcurr2) 662 break; 663 new_state = POWER_SUPPLY_STATUS_FULL; 664 665 if (s.chrgcurr1 && s.vbusvld) { 666 cpcap_charger_disconnect(ddata, new_state, HZ * 5); 667 return; 668 } 669 break; 670 case POWER_SUPPLY_STATUS_FULL: 671 if (!s.chrgcurr2) 672 break; 673 if (s.vbusvld) 674 new_state = POWER_SUPPLY_STATUS_NOT_CHARGING; 675 else 676 new_state = POWER_SUPPLY_STATUS_DISCHARGING; 677 678 cpcap_charger_disconnect(ddata, new_state, HZ * 5); 679 680 return; 681 default: 682 break; 683 } 684 685 if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) && 686 s.chrgcurr1) { 687 int max_current; 688 int vchrg, ichrg; 689 union power_supply_propval val; 690 struct power_supply *battery; 691 692 battery = power_supply_get_by_name("battery"); 693 if (!battery) { 694 dev_err(ddata->dev, "battery power_supply not available\n"); 695 return; 696 } 697 698 error = power_supply_get_property(battery, POWER_SUPPLY_PROP_PRESENT, &val); 699 power_supply_put(battery); 700 if (error) 701 goto out_err; 702 703 if (val.intval) { 704 max_current = 1596000; 705 } else { 706 dev_info(ddata->dev, "battery not inserted, charging disabled\n"); 707 max_current = 0; 708 } 709 710 if (max_current > ddata->limit_current) 711 max_current = ddata->limit_current; 712 713 ichrg = cpcap_charger_current_to_regval(max_current); 714 vchrg = cpcap_charger_voltage_to_regval(ddata->voltage); 715 error = cpcap_charger_enable(ddata, 716 CPCAP_REG_CRM_VCHRG(vchrg), 717 ichrg, 0); 718 if (error) 719 goto out_err; 720 cpcap_charger_update_state(ddata, 721 POWER_SUPPLY_STATUS_CHARGING); 722 } else { 723 error = cpcap_charger_disable(ddata); 724 if (error) 725 goto out_err; 726 cpcap_charger_update_state(ddata, 727 POWER_SUPPLY_STATUS_DISCHARGING); 728 } 729 730 power_supply_changed(ddata->usb); 731 return; 732 733 out_err: 734 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN); 735 dev_err(ddata->dev, "%s failed with %i\n", __func__, error); 736 } 737 738 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data) 739 { 740 struct cpcap_charger_ddata *ddata = data; 741 742 if (!atomic_read(&ddata->active)) 743 return IRQ_NONE; 744 745 schedule_delayed_work(&ddata->detect_work, 0); 746 747 return IRQ_HANDLED; 748 } 749 750 static int cpcap_usb_init_irq(struct platform_device *pdev, 751 struct cpcap_charger_ddata *ddata, 752 const char *name) 753 { 754 struct cpcap_interrupt_desc *d; 755 int irq, error; 756 757 irq = platform_get_irq_byname(pdev, name); 758 if (irq < 0) 759 return -ENODEV; 760 761 error = devm_request_threaded_irq(ddata->dev, irq, NULL, 762 cpcap_charger_irq_thread, 763 IRQF_SHARED | IRQF_ONESHOT, 764 name, ddata); 765 if (error) { 766 dev_err(ddata->dev, "could not get irq %s: %i\n", 767 name, error); 768 769 return error; 770 } 771 772 d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL); 773 if (!d) 774 return -ENOMEM; 775 776 d->name = name; 777 d->irq = irq; 778 list_add(&d->node, &ddata->irq_list); 779 780 return 0; 781 } 782 783 static const char * const cpcap_charger_irqs[] = { 784 /* REG_INT_0 */ 785 "chrg_det", "rvrs_chrg", 786 787 /* REG_INT1 */ 788 "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld", 789 790 /* REG_INT_3 */ 791 "battdetb", 792 }; 793 794 static int cpcap_usb_init_interrupts(struct platform_device *pdev, 795 struct cpcap_charger_ddata *ddata) 796 { 797 int i, error; 798 799 for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) { 800 error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]); 801 if (error) 802 return error; 803 } 804 805 return 0; 806 } 807 808 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata) 809 { 810 int i; 811 812 for (i = 0; i < 2; i++) { 813 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode", 814 i, GPIOD_OUT_HIGH); 815 if (IS_ERR(ddata->gpio[i])) { 816 dev_info(ddata->dev, "no mode change GPIO%i: %li\n", 817 i, PTR_ERR(ddata->gpio[i])); 818 ddata->gpio[i] = NULL; 819 } 820 } 821 } 822 823 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata) 824 { 825 const char * const names[CPCAP_CHARGER_IIO_NR] = { 826 "battdetb", "battp", "vbus", "chg_isense", "batti", 827 }; 828 int error, i; 829 830 for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) { 831 ddata->channels[i] = devm_iio_channel_get(ddata->dev, 832 names[i]); 833 if (IS_ERR(ddata->channels[i])) { 834 error = PTR_ERR(ddata->channels[i]); 835 goto out_err; 836 } 837 838 if (!ddata->channels[i]->indio_dev) { 839 error = -ENXIO; 840 goto out_err; 841 } 842 } 843 844 return 0; 845 846 out_err: 847 if (error != -EPROBE_DEFER) 848 dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n", 849 error); 850 851 return error; 852 } 853 854 static char *cpcap_charger_supplied_to[] = { 855 "battery", 856 }; 857 858 static const struct power_supply_desc cpcap_charger_usb_desc = { 859 .name = "usb", 860 .type = POWER_SUPPLY_TYPE_USB, 861 .properties = cpcap_charger_props, 862 .num_properties = ARRAY_SIZE(cpcap_charger_props), 863 .get_property = cpcap_charger_get_property, 864 .set_property = cpcap_charger_set_property, 865 .property_is_writeable = cpcap_charger_property_is_writeable, 866 }; 867 868 static const struct of_device_id cpcap_charger_id_table[] = { 869 { 870 .compatible = "motorola,mapphone-cpcap-charger", 871 }, 872 {}, 873 }; 874 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table); 875 876 static int cpcap_charger_probe(struct platform_device *pdev) 877 { 878 struct cpcap_charger_ddata *ddata; 879 struct power_supply_config psy_cfg = {}; 880 int error; 881 882 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); 883 if (!ddata) 884 return -ENOMEM; 885 886 ddata->dev = &pdev->dev; 887 ddata->voltage = 4200000; 888 ddata->limit_current = 532000; 889 890 ddata->reg = dev_get_regmap(ddata->dev->parent, NULL); 891 if (!ddata->reg) 892 return -ENODEV; 893 894 INIT_LIST_HEAD(&ddata->irq_list); 895 INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect); 896 INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work); 897 platform_set_drvdata(pdev, ddata); 898 899 error = cpcap_charger_init_iio(ddata); 900 if (error) 901 return error; 902 903 atomic_set(&ddata->active, 1); 904 905 psy_cfg.fwnode = dev_fwnode(&pdev->dev); 906 psy_cfg.drv_data = ddata; 907 psy_cfg.supplied_to = cpcap_charger_supplied_to; 908 psy_cfg.num_supplicants = ARRAY_SIZE(cpcap_charger_supplied_to); 909 910 ddata->usb = devm_power_supply_register(ddata->dev, 911 &cpcap_charger_usb_desc, 912 &psy_cfg); 913 if (IS_ERR(ddata->usb)) { 914 error = PTR_ERR(ddata->usb); 915 dev_err(ddata->dev, "failed to register USB charger: %i\n", 916 error); 917 918 return error; 919 } 920 921 error = cpcap_usb_init_interrupts(pdev, ddata); 922 if (error) 923 return error; 924 925 ddata->comparator.set_vbus = cpcap_charger_set_vbus; 926 error = omap_usb2_set_comparator(&ddata->comparator); 927 if (error == -ENODEV) { 928 dev_info(ddata->dev, "charger needs phy, deferring probe\n"); 929 return -EPROBE_DEFER; 930 } 931 932 cpcap_charger_init_optional_gpios(ddata); 933 934 schedule_delayed_work(&ddata->detect_work, 0); 935 936 return 0; 937 } 938 939 static void cpcap_charger_shutdown(struct platform_device *pdev) 940 { 941 struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev); 942 int error; 943 944 atomic_set(&ddata->active, 0); 945 error = omap_usb2_set_comparator(NULL); 946 if (error) 947 dev_warn(ddata->dev, "could not clear USB comparator: %i\n", 948 error); 949 950 error = cpcap_charger_disable(ddata); 951 if (error) { 952 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN); 953 dev_warn(ddata->dev, "could not clear charger: %i\n", 954 error); 955 } 956 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_DISCHARGING); 957 cancel_delayed_work_sync(&ddata->vbus_work); 958 cancel_delayed_work_sync(&ddata->detect_work); 959 } 960 961 static void cpcap_charger_remove(struct platform_device *pdev) 962 { 963 cpcap_charger_shutdown(pdev); 964 } 965 966 static struct platform_driver cpcap_charger_driver = { 967 .probe = cpcap_charger_probe, 968 .driver = { 969 .name = "cpcap-charger", 970 .of_match_table = cpcap_charger_id_table, 971 }, 972 .shutdown = cpcap_charger_shutdown, 973 .remove = cpcap_charger_remove, 974 }; 975 module_platform_driver(cpcap_charger_driver); 976 977 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); 978 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver"); 979 MODULE_LICENSE("GPL v2"); 980 MODULE_ALIAS("platform:cpcap-charger"); 981