1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // da9211-regulator.c - Regulator device driver for DA9211/DA9212 4 // /DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 5 // Copyright (C) 2015 Dialog Semiconductor Ltd. 6 7 #include <linux/err.h> 8 #include <linux/i2c.h> 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/slab.h> 12 #include <linux/regulator/driver.h> 13 #include <linux/regulator/machine.h> 14 #include <linux/regmap.h> 15 #include <linux/irq.h> 16 #include <linux/interrupt.h> 17 #include <linux/gpio/consumer.h> 18 #include <linux/regulator/of_regulator.h> 19 #include <linux/regulator/da9211.h> 20 #include <dt-bindings/regulator/dlg,da9211-regulator.h> 21 #include "da9211-regulator.h" 22 23 /* DEVICE IDs */ 24 #define DA9211_DEVICE_ID 0x22 25 #define DA9213_DEVICE_ID 0x23 26 #define DA9215_DEVICE_ID 0x24 27 28 /* DA9211 REGULATOR IDs */ 29 #define DA9211_ID_BUCKA 0 30 #define DA9211_ID_BUCKB 1 31 32 struct da9211 { 33 struct device *dev; 34 struct regmap *regmap; 35 struct da9211_pdata *pdata; 36 struct regulator_dev *rdev[DA9211_MAX_REGULATORS]; 37 int num_regulator; 38 int chip_irq; 39 int chip_id; 40 }; 41 42 static const struct regmap_range_cfg da9211_regmap_range[] = { 43 { 44 .selector_reg = DA9211_REG_PAGE_CON, 45 .selector_mask = DA9211_REG_PAGE_MASK, 46 .selector_shift = DA9211_REG_PAGE_SHIFT, 47 .window_start = 0, 48 .window_len = 256, 49 .range_min = 0, 50 .range_max = 5*128, 51 }, 52 }; 53 54 static bool da9211_volatile_reg(struct device *dev, unsigned int reg) 55 { 56 switch (reg) { 57 case DA9211_REG_STATUS_A: 58 case DA9211_REG_STATUS_B: 59 case DA9211_REG_EVENT_A: 60 case DA9211_REG_EVENT_B: 61 return true; 62 } 63 return false; 64 } 65 66 static const struct regmap_config da9211_regmap_config = { 67 .reg_bits = 8, 68 .val_bits = 8, 69 .max_register = 5 * 128, 70 .volatile_reg = da9211_volatile_reg, 71 .cache_type = REGCACHE_RBTREE, 72 .ranges = da9211_regmap_range, 73 .num_ranges = ARRAY_SIZE(da9211_regmap_range), 74 }; 75 76 /* Default limits measured in millivolts and milliamps */ 77 #define DA9211_MIN_MV 300 78 #define DA9211_MAX_MV 1570 79 #define DA9211_STEP_MV 10 80 81 /* Current limits for DA9211 buck (uA) indices 82 * corresponds with register values 83 */ 84 static const int da9211_current_limits[] = { 85 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000, 86 3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000 87 }; 88 /* Current limits for DA9213 buck (uA) indices 89 * corresponds with register values 90 */ 91 static const int da9213_current_limits[] = { 92 3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 93 4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000 94 }; 95 /* Current limits for DA9215 buck (uA) indices 96 * corresponds with register values 97 */ 98 static const int da9215_current_limits[] = { 99 4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000, 100 5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000 101 }; 102 103 static unsigned int da9211_map_buck_mode(unsigned int mode) 104 { 105 switch (mode) { 106 case DA9211_BUCK_MODE_SLEEP: 107 return REGULATOR_MODE_STANDBY; 108 case DA9211_BUCK_MODE_SYNC: 109 return REGULATOR_MODE_FAST; 110 case DA9211_BUCK_MODE_AUTO: 111 return REGULATOR_MODE_NORMAL; 112 default: 113 return REGULATOR_MODE_INVALID; 114 } 115 } 116 117 static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev) 118 { 119 int id = rdev_get_id(rdev); 120 struct da9211 *chip = rdev_get_drvdata(rdev); 121 unsigned int data; 122 int ret, mode = 0; 123 124 ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data); 125 if (ret < 0) 126 return ret; 127 128 switch (data & 0x03) { 129 case DA9211_BUCK_MODE_SYNC: 130 mode = REGULATOR_MODE_FAST; 131 break; 132 case DA9211_BUCK_MODE_AUTO: 133 mode = REGULATOR_MODE_NORMAL; 134 break; 135 case DA9211_BUCK_MODE_SLEEP: 136 mode = REGULATOR_MODE_STANDBY; 137 break; 138 } 139 140 return mode; 141 } 142 143 static int da9211_buck_set_mode(struct regulator_dev *rdev, 144 unsigned int mode) 145 { 146 int id = rdev_get_id(rdev); 147 struct da9211 *chip = rdev_get_drvdata(rdev); 148 int val = 0; 149 150 switch (mode) { 151 case REGULATOR_MODE_FAST: 152 val = DA9211_BUCK_MODE_SYNC; 153 break; 154 case REGULATOR_MODE_NORMAL: 155 val = DA9211_BUCK_MODE_AUTO; 156 break; 157 case REGULATOR_MODE_STANDBY: 158 val = DA9211_BUCK_MODE_SLEEP; 159 break; 160 } 161 162 return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id, 163 0x03, val); 164 } 165 166 static int da9211_set_current_limit(struct regulator_dev *rdev, int min, 167 int max) 168 { 169 int id = rdev_get_id(rdev); 170 struct da9211 *chip = rdev_get_drvdata(rdev); 171 int i, max_size; 172 const int *current_limits; 173 174 switch (chip->chip_id) { 175 case DA9211: 176 current_limits = da9211_current_limits; 177 max_size = ARRAY_SIZE(da9211_current_limits)-1; 178 break; 179 case DA9213: 180 current_limits = da9213_current_limits; 181 max_size = ARRAY_SIZE(da9213_current_limits)-1; 182 break; 183 case DA9215: 184 current_limits = da9215_current_limits; 185 max_size = ARRAY_SIZE(da9215_current_limits)-1; 186 break; 187 default: 188 return -EINVAL; 189 } 190 191 /* search for closest to maximum */ 192 for (i = max_size; i >= 0; i--) { 193 if (min <= current_limits[i] && 194 max >= current_limits[i]) { 195 return regmap_update_bits(chip->regmap, 196 DA9211_REG_BUCK_ILIM, 197 (0x0F << id*4), (i << id*4)); 198 } 199 } 200 201 return -EINVAL; 202 } 203 204 static int da9211_get_current_limit(struct regulator_dev *rdev) 205 { 206 int id = rdev_get_id(rdev); 207 struct da9211 *chip = rdev_get_drvdata(rdev); 208 unsigned int data; 209 int ret; 210 const int *current_limits; 211 212 switch (chip->chip_id) { 213 case DA9211: 214 current_limits = da9211_current_limits; 215 break; 216 case DA9213: 217 current_limits = da9213_current_limits; 218 break; 219 case DA9215: 220 current_limits = da9215_current_limits; 221 break; 222 default: 223 return -EINVAL; 224 } 225 226 ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data); 227 if (ret < 0) 228 return ret; 229 230 /* select one of 16 values: 0000 (2000mA or 3000mA) 231 * to 1111 (5000mA or 6000mA). 232 */ 233 data = (data >> id*4) & 0x0F; 234 return current_limits[data]; 235 } 236 237 static const struct regulator_ops da9211_buck_ops = { 238 .get_mode = da9211_buck_get_mode, 239 .set_mode = da9211_buck_set_mode, 240 .enable = regulator_enable_regmap, 241 .disable = regulator_disable_regmap, 242 .is_enabled = regulator_is_enabled_regmap, 243 .set_voltage_sel = regulator_set_voltage_sel_regmap, 244 .get_voltage_sel = regulator_get_voltage_sel_regmap, 245 .list_voltage = regulator_list_voltage_linear, 246 .set_current_limit = da9211_set_current_limit, 247 .get_current_limit = da9211_get_current_limit, 248 }; 249 250 #define DA9211_BUCK(_id) \ 251 {\ 252 .name = #_id,\ 253 .ops = &da9211_buck_ops,\ 254 .type = REGULATOR_VOLTAGE,\ 255 .id = DA9211_ID_##_id,\ 256 .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\ 257 .min_uV = (DA9211_MIN_MV * 1000),\ 258 .uV_step = (DA9211_STEP_MV * 1000),\ 259 .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\ 260 .enable_mask = DA9211_BUCKA_EN,\ 261 .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\ 262 .vsel_mask = DA9211_VBUCK_MASK,\ 263 .owner = THIS_MODULE,\ 264 .of_map_mode = da9211_map_buck_mode,\ 265 } 266 267 static struct regulator_desc da9211_regulators[] = { 268 DA9211_BUCK(BUCKA), 269 DA9211_BUCK(BUCKB), 270 }; 271 272 #ifdef CONFIG_OF 273 static struct of_regulator_match da9211_matches[] = { 274 [DA9211_ID_BUCKA] = { 275 .name = "BUCKA", 276 .desc = &da9211_regulators[DA9211_ID_BUCKA], 277 }, 278 [DA9211_ID_BUCKB] = { 279 .name = "BUCKB", 280 .desc = &da9211_regulators[DA9211_ID_BUCKB], 281 }, 282 }; 283 284 static struct da9211_pdata *da9211_parse_regulators_dt( 285 struct device *dev) 286 { 287 struct da9211_pdata *pdata; 288 struct device_node *node; 289 int i, num, n; 290 291 node = of_get_child_by_name(dev->of_node, "regulators"); 292 if (!node) { 293 dev_err(dev, "regulators node not found\n"); 294 return ERR_PTR(-ENODEV); 295 } 296 297 num = of_regulator_match(dev, node, da9211_matches, 298 ARRAY_SIZE(da9211_matches)); 299 of_node_put(node); 300 if (num < 0) { 301 dev_err(dev, "Failed to match regulators\n"); 302 return ERR_PTR(-EINVAL); 303 } 304 305 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 306 if (!pdata) 307 return ERR_PTR(-ENOMEM); 308 309 pdata->num_buck = num; 310 311 n = 0; 312 for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) { 313 if (!da9211_matches[i].init_data) 314 continue; 315 316 pdata->init_data[n] = da9211_matches[i].init_data; 317 pdata->reg_node[n] = da9211_matches[i].of_node; 318 pdata->gpiod_ren[n] = devm_fwnode_gpiod_get(dev, 319 of_fwnode_handle(pdata->reg_node[n]), 320 "enable", 321 GPIOD_OUT_HIGH | 322 GPIOD_FLAGS_BIT_NONEXCLUSIVE, 323 "da9211-enable"); 324 if (IS_ERR(pdata->gpiod_ren[n])) 325 pdata->gpiod_ren[n] = NULL; 326 n++; 327 } 328 329 return pdata; 330 } 331 #else 332 static struct da9211_pdata *da9211_parse_regulators_dt( 333 struct device *dev) 334 { 335 return ERR_PTR(-ENODEV); 336 } 337 #endif 338 339 static irqreturn_t da9211_irq_handler(int irq, void *data) 340 { 341 struct da9211 *chip = data; 342 int reg_val, err, ret = IRQ_NONE; 343 344 err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, ®_val); 345 if (err < 0) 346 goto error_i2c; 347 348 if (reg_val & DA9211_E_OV_CURR_A) { 349 regulator_notifier_call_chain(chip->rdev[0], 350 REGULATOR_EVENT_OVER_CURRENT, NULL); 351 352 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, 353 DA9211_E_OV_CURR_A); 354 if (err < 0) 355 goto error_i2c; 356 357 ret = IRQ_HANDLED; 358 } 359 360 if (reg_val & DA9211_E_OV_CURR_B) { 361 regulator_notifier_call_chain(chip->rdev[1], 362 REGULATOR_EVENT_OVER_CURRENT, NULL); 363 364 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, 365 DA9211_E_OV_CURR_B); 366 if (err < 0) 367 goto error_i2c; 368 369 ret = IRQ_HANDLED; 370 } 371 372 return ret; 373 374 error_i2c: 375 dev_err(chip->dev, "I2C error : %d\n", err); 376 return IRQ_NONE; 377 } 378 379 static int da9211_regulator_init(struct da9211 *chip) 380 { 381 struct regulator_config config = { }; 382 int i, ret; 383 unsigned int data; 384 385 ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data); 386 if (ret < 0) { 387 dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret); 388 return ret; 389 } 390 391 data &= DA9211_SLAVE_SEL; 392 /* If configuration for 1/2 bucks is different between platform data 393 * and the register, driver should exit. 394 */ 395 if (chip->pdata->num_buck == 1 && data == 0x00) 396 chip->num_regulator = 1; 397 else if (chip->pdata->num_buck == 2 && data != 0x00) 398 chip->num_regulator = 2; 399 else { 400 dev_err(chip->dev, "Configuration is mismatched\n"); 401 return -EINVAL; 402 } 403 404 for (i = 0; i < chip->num_regulator; i++) { 405 config.init_data = chip->pdata->init_data[i]; 406 config.dev = chip->dev; 407 config.driver_data = chip; 408 config.regmap = chip->regmap; 409 config.of_node = chip->pdata->reg_node[i]; 410 411 if (chip->pdata->gpiod_ren[i]) 412 config.ena_gpiod = chip->pdata->gpiod_ren[i]; 413 else 414 config.ena_gpiod = NULL; 415 416 /* 417 * Hand the GPIO descriptor management over to the regulator 418 * core, remove it from GPIO devres management. 419 */ 420 if (config.ena_gpiod) 421 devm_gpiod_unhinge(chip->dev, config.ena_gpiod); 422 chip->rdev[i] = devm_regulator_register(chip->dev, 423 &da9211_regulators[i], &config); 424 if (IS_ERR(chip->rdev[i])) { 425 dev_err(chip->dev, 426 "Failed to register DA9211 regulator\n"); 427 return PTR_ERR(chip->rdev[i]); 428 } 429 430 if (chip->chip_irq != 0) { 431 ret = regmap_update_bits(chip->regmap, 432 DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0); 433 if (ret < 0) { 434 dev_err(chip->dev, 435 "Failed to update mask reg: %d\n", ret); 436 return ret; 437 } 438 } 439 } 440 441 return 0; 442 } 443 444 /* 445 * I2C driver interface functions 446 */ 447 static int da9211_i2c_probe(struct i2c_client *i2c) 448 { 449 struct da9211 *chip; 450 int error, ret; 451 unsigned int data; 452 453 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL); 454 if (!chip) 455 return -ENOMEM; 456 457 chip->dev = &i2c->dev; 458 chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config); 459 if (IS_ERR(chip->regmap)) { 460 error = PTR_ERR(chip->regmap); 461 dev_err(chip->dev, "Failed to allocate register map: %d\n", 462 error); 463 return error; 464 } 465 466 i2c_set_clientdata(i2c, chip); 467 468 chip->pdata = i2c->dev.platform_data; 469 470 ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data); 471 if (ret < 0) { 472 dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret); 473 return ret; 474 } 475 476 switch (data) { 477 case DA9211_DEVICE_ID: 478 chip->chip_id = DA9211; 479 break; 480 case DA9213_DEVICE_ID: 481 chip->chip_id = DA9213; 482 break; 483 case DA9215_DEVICE_ID: 484 chip->chip_id = DA9215; 485 break; 486 default: 487 dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data); 488 return -ENODEV; 489 } 490 491 if (!chip->pdata) 492 chip->pdata = da9211_parse_regulators_dt(chip->dev); 493 494 if (IS_ERR(chip->pdata)) { 495 dev_err(chip->dev, "No regulators defined for the platform\n"); 496 return PTR_ERR(chip->pdata); 497 } 498 499 chip->chip_irq = i2c->irq; 500 501 if (chip->chip_irq != 0) { 502 ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL, 503 da9211_irq_handler, 504 IRQF_TRIGGER_LOW|IRQF_ONESHOT, 505 "da9211", chip); 506 if (ret != 0) { 507 dev_err(chip->dev, "Failed to request IRQ: %d\n", 508 chip->chip_irq); 509 return ret; 510 } 511 } else { 512 dev_warn(chip->dev, "No IRQ configured\n"); 513 } 514 515 ret = da9211_regulator_init(chip); 516 517 if (ret < 0) 518 dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret); 519 520 return ret; 521 } 522 523 static const struct i2c_device_id da9211_i2c_id[] = { 524 {"da9211", DA9211}, 525 {"da9212", DA9212}, 526 {"da9213", DA9213}, 527 {"da9223", DA9223}, 528 {"da9214", DA9214}, 529 {"da9224", DA9224}, 530 {"da9215", DA9215}, 531 {"da9225", DA9225}, 532 {}, 533 }; 534 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id); 535 536 #ifdef CONFIG_OF 537 static const struct of_device_id da9211_dt_ids[] = { 538 { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] }, 539 { .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] }, 540 { .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] }, 541 { .compatible = "dlg,da9223", .data = &da9211_i2c_id[3] }, 542 { .compatible = "dlg,da9214", .data = &da9211_i2c_id[4] }, 543 { .compatible = "dlg,da9224", .data = &da9211_i2c_id[5] }, 544 { .compatible = "dlg,da9215", .data = &da9211_i2c_id[6] }, 545 { .compatible = "dlg,da9225", .data = &da9211_i2c_id[7] }, 546 {}, 547 }; 548 MODULE_DEVICE_TABLE(of, da9211_dt_ids); 549 #endif 550 551 static struct i2c_driver da9211_regulator_driver = { 552 .driver = { 553 .name = "da9211", 554 .of_match_table = of_match_ptr(da9211_dt_ids), 555 }, 556 .probe_new = da9211_i2c_probe, 557 .id_table = da9211_i2c_id, 558 }; 559 560 module_i2c_driver(da9211_regulator_driver); 561 562 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); 563 MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver"); 564 MODULE_LICENSE("GPL"); 565