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