1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (C) 2018 Spreadtrum Communications Inc. 3 4 #include <linux/module.h> 5 #include <linux/platform_device.h> 6 #include <linux/power_supply.h> 7 #include <linux/usb/phy.h> 8 #include <linux/regmap.h> 9 #include <linux/notifier.h> 10 #include <linux/of.h> 11 12 /* PMIC global registers definition */ 13 #define SC2731_CHARGE_STATUS 0xedc 14 #define SC2731_CHARGE_FULL BIT(4) 15 #define SC2731_MODULE_EN1 0xc0c 16 #define SC2731_CHARGE_EN BIT(5) 17 18 /* SC2731 switch charger registers definition */ 19 #define SC2731_CHG_CFG0 0x0 20 #define SC2731_CHG_CFG1 0x4 21 #define SC2731_CHG_CFG2 0x8 22 #define SC2731_CHG_CFG3 0xc 23 #define SC2731_CHG_CFG4 0x10 24 #define SC2731_CHG_CFG5 0x28 25 26 /* SC2731_CHG_CFG0 register definition */ 27 #define SC2731_PRECHG_RNG_SHIFT 11 28 #define SC2731_PRECHG_RNG_MASK GENMASK(12, 11) 29 30 #define SC2731_TERMINATION_VOL_MASK GENMASK(2, 1) 31 #define SC2731_TERMINATION_VOL_SHIFT 1 32 #define SC2731_TERMINATION_VOL_CAL_MASK GENMASK(8, 3) 33 #define SC2731_TERMINATION_VOL_CAL_SHIFT 3 34 #define SC2731_TERMINATION_CUR_MASK GENMASK(2, 0) 35 36 #define SC2731_CC_EN BIT(13) 37 #define SC2731_CHARGER_PD BIT(0) 38 39 /* SC2731_CHG_CFG1 register definition */ 40 #define SC2731_CUR_MASK GENMASK(5, 0) 41 42 /* SC2731_CHG_CFG5 register definition */ 43 #define SC2731_CUR_LIMIT_SHIFT 8 44 #define SC2731_CUR_LIMIT_MASK GENMASK(9, 8) 45 46 /* Default current definition (unit is mA) */ 47 #define SC2731_CURRENT_LIMIT_100 100 48 #define SC2731_CURRENT_LIMIT_500 500 49 #define SC2731_CURRENT_LIMIT_900 900 50 #define SC2731_CURRENT_LIMIT_2000 2000 51 #define SC2731_CURRENT_PRECHG 450 52 #define SC2731_CURRENT_STEP 50 53 54 struct sc2731_charger_info { 55 struct device *dev; 56 struct regmap *regmap; 57 struct usb_phy *usb_phy; 58 struct notifier_block usb_notify; 59 struct power_supply *psy_usb; 60 struct work_struct work; 61 struct mutex lock; 62 bool charging; 63 u32 base; 64 u32 limit; 65 }; 66 67 static void sc2731_charger_stop_charge(struct sc2731_charger_info *info) 68 { 69 regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, 70 SC2731_CC_EN, 0); 71 72 regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, 73 SC2731_CHARGER_PD, SC2731_CHARGER_PD); 74 } 75 76 static int sc2731_charger_start_charge(struct sc2731_charger_info *info) 77 { 78 int ret; 79 80 /* Enable charger constant current mode */ 81 ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, 82 SC2731_CC_EN, SC2731_CC_EN); 83 if (ret) 84 return ret; 85 86 /* Start charging */ 87 return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, 88 SC2731_CHARGER_PD, 0); 89 } 90 91 static int sc2731_charger_set_current_limit(struct sc2731_charger_info *info, 92 u32 limit) 93 { 94 u32 val; 95 96 if (limit <= SC2731_CURRENT_LIMIT_100) 97 val = 0; 98 else if (limit <= SC2731_CURRENT_LIMIT_500) 99 val = 3; 100 else if (limit <= SC2731_CURRENT_LIMIT_900) 101 val = 2; 102 else 103 val = 1; 104 105 return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG5, 106 SC2731_CUR_LIMIT_MASK, 107 val << SC2731_CUR_LIMIT_SHIFT); 108 } 109 110 static int sc2731_charger_set_current(struct sc2731_charger_info *info, u32 cur) 111 { 112 u32 val; 113 int ret; 114 115 if (cur > SC2731_CURRENT_LIMIT_2000) 116 cur = SC2731_CURRENT_LIMIT_2000; 117 else if (cur < SC2731_CURRENT_PRECHG) 118 cur = SC2731_CURRENT_PRECHG; 119 120 /* Calculate the step value, each step is 50 mA */ 121 val = (cur - SC2731_CURRENT_PRECHG) / SC2731_CURRENT_STEP; 122 123 /* Set pre-charge current as 450 mA */ 124 ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, 125 SC2731_PRECHG_RNG_MASK, 126 0x3 << SC2731_PRECHG_RNG_SHIFT); 127 if (ret) 128 return ret; 129 130 return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG1, 131 SC2731_CUR_MASK, val); 132 } 133 134 static int sc2731_charger_get_status(struct sc2731_charger_info *info) 135 { 136 u32 val; 137 int ret; 138 139 ret = regmap_read(info->regmap, SC2731_CHARGE_STATUS, &val); 140 if (ret) 141 return ret; 142 143 if (val & SC2731_CHARGE_FULL) 144 return POWER_SUPPLY_STATUS_FULL; 145 146 return POWER_SUPPLY_STATUS_CHARGING; 147 } 148 149 static int sc2731_charger_get_current(struct sc2731_charger_info *info, 150 u32 *cur) 151 { 152 int ret; 153 u32 val; 154 155 ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG1, &val); 156 if (ret) 157 return ret; 158 159 val &= SC2731_CUR_MASK; 160 *cur = val * SC2731_CURRENT_STEP + SC2731_CURRENT_PRECHG; 161 162 return 0; 163 } 164 165 static int sc2731_charger_get_current_limit(struct sc2731_charger_info *info, 166 u32 *cur) 167 { 168 int ret; 169 u32 val; 170 171 ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG5, &val); 172 if (ret) 173 return ret; 174 175 val = (val & SC2731_CUR_LIMIT_MASK) >> SC2731_CUR_LIMIT_SHIFT; 176 177 switch (val) { 178 case 0: 179 *cur = SC2731_CURRENT_LIMIT_100; 180 break; 181 182 case 1: 183 *cur = SC2731_CURRENT_LIMIT_2000; 184 break; 185 186 case 2: 187 *cur = SC2731_CURRENT_LIMIT_900; 188 break; 189 190 case 3: 191 *cur = SC2731_CURRENT_LIMIT_500; 192 break; 193 194 default: 195 return -EINVAL; 196 } 197 198 return 0; 199 } 200 201 static int 202 sc2731_charger_usb_set_property(struct power_supply *psy, 203 enum power_supply_property psp, 204 const union power_supply_propval *val) 205 { 206 struct sc2731_charger_info *info = power_supply_get_drvdata(psy); 207 int ret; 208 209 mutex_lock(&info->lock); 210 211 if (!info->charging) { 212 mutex_unlock(&info->lock); 213 return -ENODEV; 214 } 215 216 switch (psp) { 217 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 218 ret = sc2731_charger_set_current(info, val->intval / 1000); 219 if (ret < 0) 220 dev_err(info->dev, "set charge current failed\n"); 221 break; 222 223 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 224 ret = sc2731_charger_set_current_limit(info, 225 val->intval / 1000); 226 if (ret < 0) 227 dev_err(info->dev, "set input current limit failed\n"); 228 break; 229 230 default: 231 ret = -EINVAL; 232 } 233 234 mutex_unlock(&info->lock); 235 return ret; 236 } 237 238 static int sc2731_charger_usb_get_property(struct power_supply *psy, 239 enum power_supply_property psp, 240 union power_supply_propval *val) 241 { 242 struct sc2731_charger_info *info = power_supply_get_drvdata(psy); 243 int ret = 0; 244 u32 cur; 245 246 mutex_lock(&info->lock); 247 248 switch (psp) { 249 case POWER_SUPPLY_PROP_STATUS: 250 if (info->charging) 251 val->intval = sc2731_charger_get_status(info); 252 else 253 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 254 break; 255 256 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 257 if (!info->charging) { 258 val->intval = 0; 259 } else { 260 ret = sc2731_charger_get_current(info, &cur); 261 if (ret) 262 goto out; 263 264 val->intval = cur * 1000; 265 } 266 break; 267 268 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 269 if (!info->charging) { 270 val->intval = 0; 271 } else { 272 ret = sc2731_charger_get_current_limit(info, &cur); 273 if (ret) 274 goto out; 275 276 val->intval = cur * 1000; 277 } 278 break; 279 280 default: 281 ret = -EINVAL; 282 } 283 284 out: 285 mutex_unlock(&info->lock); 286 return ret; 287 } 288 289 static int sc2731_charger_property_is_writeable(struct power_supply *psy, 290 enum power_supply_property psp) 291 { 292 int ret; 293 294 switch (psp) { 295 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 296 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 297 ret = 1; 298 break; 299 300 default: 301 ret = 0; 302 } 303 304 return ret; 305 } 306 307 static enum power_supply_property sc2731_usb_props[] = { 308 POWER_SUPPLY_PROP_STATUS, 309 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, 310 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, 311 }; 312 313 static const struct power_supply_desc sc2731_charger_desc = { 314 .name = "sc2731_charger", 315 .type = POWER_SUPPLY_TYPE_USB, 316 .properties = sc2731_usb_props, 317 .num_properties = ARRAY_SIZE(sc2731_usb_props), 318 .get_property = sc2731_charger_usb_get_property, 319 .set_property = sc2731_charger_usb_set_property, 320 .property_is_writeable = sc2731_charger_property_is_writeable, 321 }; 322 323 static void sc2731_charger_work(struct work_struct *data) 324 { 325 struct sc2731_charger_info *info = 326 container_of(data, struct sc2731_charger_info, work); 327 int ret; 328 329 mutex_lock(&info->lock); 330 331 if (info->limit > 0 && !info->charging) { 332 /* set current limitation and start to charge */ 333 ret = sc2731_charger_set_current_limit(info, info->limit); 334 if (ret) 335 goto out; 336 337 ret = sc2731_charger_set_current(info, info->limit); 338 if (ret) 339 goto out; 340 341 ret = sc2731_charger_start_charge(info); 342 if (ret) 343 goto out; 344 345 info->charging = true; 346 } else if (!info->limit && info->charging) { 347 /* Stop charging */ 348 info->charging = false; 349 sc2731_charger_stop_charge(info); 350 } 351 352 out: 353 mutex_unlock(&info->lock); 354 } 355 356 static int sc2731_charger_usb_change(struct notifier_block *nb, 357 unsigned long limit, void *data) 358 { 359 struct sc2731_charger_info *info = 360 container_of(nb, struct sc2731_charger_info, usb_notify); 361 362 info->limit = limit; 363 364 schedule_work(&info->work); 365 366 return NOTIFY_OK; 367 } 368 369 static int sc2731_charger_hw_init(struct sc2731_charger_info *info) 370 { 371 struct power_supply_battery_info *bat_info; 372 u32 term_currrent, term_voltage, cur_val, vol_val; 373 int ret; 374 375 /* Enable charger module */ 376 ret = regmap_update_bits(info->regmap, SC2731_MODULE_EN1, 377 SC2731_CHARGE_EN, SC2731_CHARGE_EN); 378 if (ret) 379 return ret; 380 381 ret = power_supply_get_battery_info(info->psy_usb, &bat_info); 382 if (ret) { 383 dev_warn(info->dev, "no battery information is supplied\n"); 384 385 /* 386 * If no battery information is supplied, we should set 387 * default charge termination current to 120 mA, and default 388 * charge termination voltage to 4.35V. 389 */ 390 cur_val = 0x2; 391 vol_val = 0x1; 392 } else { 393 term_currrent = bat_info->charge_term_current_ua / 1000; 394 395 if (term_currrent <= 90) 396 cur_val = 0; 397 else if (term_currrent >= 265) 398 cur_val = 0x7; 399 else 400 cur_val = ((term_currrent - 90) / 25) + 1; 401 402 term_voltage = bat_info->constant_charge_voltage_max_uv / 1000; 403 404 if (term_voltage > 4500) 405 term_voltage = 4500; 406 407 if (term_voltage > 4200) 408 vol_val = (term_voltage - 4200) / 100; 409 else 410 vol_val = 0; 411 412 power_supply_put_battery_info(info->psy_usb, bat_info); 413 } 414 415 /* Set charge termination current */ 416 ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG2, 417 SC2731_TERMINATION_CUR_MASK, cur_val); 418 if (ret) 419 goto error; 420 421 /* Set charge termination voltage */ 422 ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, 423 SC2731_TERMINATION_VOL_MASK | 424 SC2731_TERMINATION_VOL_CAL_MASK, 425 (vol_val << SC2731_TERMINATION_VOL_SHIFT) | 426 (0x6 << SC2731_TERMINATION_VOL_CAL_SHIFT)); 427 if (ret) 428 goto error; 429 430 return 0; 431 432 error: 433 regmap_update_bits(info->regmap, SC2731_MODULE_EN1, SC2731_CHARGE_EN, 0); 434 return ret; 435 } 436 437 static void sc2731_charger_detect_status(struct sc2731_charger_info *info) 438 { 439 unsigned int min, max; 440 441 /* 442 * If the USB charger status has been USB_CHARGER_PRESENT before 443 * registering the notifier, we should start to charge with getting 444 * the charge current. 445 */ 446 if (info->usb_phy->chg_state != USB_CHARGER_PRESENT) 447 return; 448 449 usb_phy_get_charger_current(info->usb_phy, &min, &max); 450 info->limit = min; 451 452 schedule_work(&info->work); 453 } 454 455 static int sc2731_charger_probe(struct platform_device *pdev) 456 { 457 struct device_node *np = pdev->dev.of_node; 458 struct sc2731_charger_info *info; 459 struct power_supply_config charger_cfg = { }; 460 int ret; 461 462 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 463 if (!info) 464 return -ENOMEM; 465 466 mutex_init(&info->lock); 467 info->dev = &pdev->dev; 468 INIT_WORK(&info->work, sc2731_charger_work); 469 470 info->regmap = dev_get_regmap(pdev->dev.parent, NULL); 471 if (!info->regmap) { 472 dev_err(&pdev->dev, "failed to get charger regmap\n"); 473 return -ENODEV; 474 } 475 476 ret = of_property_read_u32(np, "reg", &info->base); 477 if (ret) { 478 dev_err(&pdev->dev, "failed to get register address\n"); 479 return -ENODEV; 480 } 481 482 charger_cfg.drv_data = info; 483 charger_cfg.of_node = np; 484 info->psy_usb = devm_power_supply_register(&pdev->dev, 485 &sc2731_charger_desc, 486 &charger_cfg); 487 if (IS_ERR(info->psy_usb)) { 488 dev_err(&pdev->dev, "failed to register power supply\n"); 489 return PTR_ERR(info->psy_usb); 490 } 491 492 ret = sc2731_charger_hw_init(info); 493 if (ret) 494 return ret; 495 496 info->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0); 497 if (IS_ERR(info->usb_phy)) { 498 dev_err(&pdev->dev, "failed to find USB phy\n"); 499 return PTR_ERR(info->usb_phy); 500 } 501 502 info->usb_notify.notifier_call = sc2731_charger_usb_change; 503 ret = usb_register_notifier(info->usb_phy, &info->usb_notify); 504 if (ret) { 505 dev_err(&pdev->dev, "failed to register notifier: %d\n", ret); 506 return ret; 507 } 508 509 sc2731_charger_detect_status(info); 510 511 return 0; 512 } 513 514 static void sc2731_charger_remove(struct platform_device *pdev) 515 { 516 struct sc2731_charger_info *info = platform_get_drvdata(pdev); 517 518 usb_unregister_notifier(info->usb_phy, &info->usb_notify); 519 } 520 521 static const struct of_device_id sc2731_charger_of_match[] = { 522 { .compatible = "sprd,sc2731-charger", }, 523 { } 524 }; 525 MODULE_DEVICE_TABLE(of, sc2731_charger_of_match); 526 527 static struct platform_driver sc2731_charger_driver = { 528 .driver = { 529 .name = "sc2731-charger", 530 .of_match_table = sc2731_charger_of_match, 531 }, 532 .probe = sc2731_charger_probe, 533 .remove_new = sc2731_charger_remove, 534 }; 535 536 module_platform_driver(sc2731_charger_driver); 537 538 MODULE_DESCRIPTION("Spreadtrum SC2731 Charger Driver"); 539 MODULE_LICENSE("GPL v2"); 540