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