1 /* 2 * pv88090-regulator.c - Regulator device driver for PV88090 3 * Copyright (C) 2015 Powerventure Semiconductor Ltd. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License 7 * as published by the Free Software Foundation; either version 2 8 * of the License, or (at your option) any later version. 9 * 10 * This program 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 13 * GNU General Public License for more details. 14 */ 15 16 #include <linux/err.h> 17 #include <linux/i2c.h> 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/slab.h> 21 #include <linux/regulator/driver.h> 22 #include <linux/regulator/machine.h> 23 #include <linux/regmap.h> 24 #include <linux/irq.h> 25 #include <linux/interrupt.h> 26 #include <linux/regulator/of_regulator.h> 27 #include "pv88090-regulator.h" 28 29 #define PV88090_MAX_REGULATORS 5 30 31 /* PV88090 REGULATOR IDs */ 32 enum { 33 /* BUCKs */ 34 PV88090_ID_BUCK1, 35 PV88090_ID_BUCK2, 36 PV88090_ID_BUCK3, 37 38 /* LDOs */ 39 PV88090_ID_LDO1, 40 PV88090_ID_LDO2, 41 }; 42 43 struct pv88090_regulator { 44 struct regulator_desc desc; 45 /* Current limiting */ 46 unsigned n_current_limits; 47 const int *current_limits; 48 unsigned int limit_mask; 49 unsigned int conf; 50 unsigned int conf2; 51 }; 52 53 struct pv88090 { 54 struct device *dev; 55 struct regmap *regmap; 56 struct regulator_dev *rdev[PV88090_MAX_REGULATORS]; 57 }; 58 59 struct pv88090_buck_voltage { 60 int min_uV; 61 int max_uV; 62 int uV_step; 63 }; 64 65 static const struct regmap_config pv88090_regmap_config = { 66 .reg_bits = 8, 67 .val_bits = 8, 68 }; 69 70 /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3. 71 * Entry indexes corresponds to register values. 72 */ 73 74 static const int pv88090_buck1_limits[] = { 75 220000, 440000, 660000, 880000, 1100000, 1320000, 1540000, 1760000, 76 1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000, 77 3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000, 78 5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000 79 }; 80 81 static const int pv88090_buck23_limits[] = { 82 1496000, 2393000, 3291000, 4189000 83 }; 84 85 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = { 86 { 87 .min_uV = 600000, 88 .max_uV = 1393750, 89 .uV_step = 6250, 90 }, 91 92 { 93 .min_uV = 1400000, 94 .max_uV = 2193750, 95 .uV_step = 6250, 96 }, 97 { 98 .min_uV = 1250000, 99 .max_uV = 2837500, 100 .uV_step = 12500, 101 }, 102 }; 103 104 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev) 105 { 106 struct pv88090_regulator *info = rdev_get_drvdata(rdev); 107 unsigned int data; 108 int ret, mode = 0; 109 110 ret = regmap_read(rdev->regmap, info->conf, &data); 111 if (ret < 0) 112 return ret; 113 114 switch (data & PV88090_BUCK1_MODE_MASK) { 115 case PV88090_BUCK_MODE_SYNC: 116 mode = REGULATOR_MODE_FAST; 117 break; 118 case PV88090_BUCK_MODE_AUTO: 119 mode = REGULATOR_MODE_NORMAL; 120 break; 121 case PV88090_BUCK_MODE_SLEEP: 122 mode = REGULATOR_MODE_STANDBY; 123 break; 124 } 125 126 return mode; 127 } 128 129 static int pv88090_buck_set_mode(struct regulator_dev *rdev, 130 unsigned int mode) 131 { 132 struct pv88090_regulator *info = rdev_get_drvdata(rdev); 133 int val = 0; 134 135 switch (mode) { 136 case REGULATOR_MODE_FAST: 137 val = PV88090_BUCK_MODE_SYNC; 138 break; 139 case REGULATOR_MODE_NORMAL: 140 val = PV88090_BUCK_MODE_AUTO; 141 break; 142 case REGULATOR_MODE_STANDBY: 143 val = PV88090_BUCK_MODE_SLEEP; 144 break; 145 default: 146 return -EINVAL; 147 } 148 149 return regmap_update_bits(rdev->regmap, info->conf, 150 PV88090_BUCK1_MODE_MASK, val); 151 } 152 153 static int pv88090_set_current_limit(struct regulator_dev *rdev, int min, 154 int max) 155 { 156 struct pv88090_regulator *info = rdev_get_drvdata(rdev); 157 int i; 158 159 /* search for closest to maximum */ 160 for (i = info->n_current_limits; i >= 0; i--) { 161 if (min <= info->current_limits[i] 162 && max >= info->current_limits[i]) { 163 return regmap_update_bits(rdev->regmap, 164 info->conf, 165 info->limit_mask, 166 i << PV88090_BUCK1_ILIM_SHIFT); 167 } 168 } 169 170 return -EINVAL; 171 } 172 173 static int pv88090_get_current_limit(struct regulator_dev *rdev) 174 { 175 struct pv88090_regulator *info = rdev_get_drvdata(rdev); 176 unsigned int data; 177 int ret; 178 179 ret = regmap_read(rdev->regmap, info->conf, &data); 180 if (ret < 0) 181 return ret; 182 183 data = (data & info->limit_mask) >> PV88090_BUCK1_ILIM_SHIFT; 184 return info->current_limits[data]; 185 } 186 187 static struct regulator_ops pv88090_buck_ops = { 188 .get_mode = pv88090_buck_get_mode, 189 .set_mode = pv88090_buck_set_mode, 190 .enable = regulator_enable_regmap, 191 .disable = regulator_disable_regmap, 192 .is_enabled = regulator_is_enabled_regmap, 193 .set_voltage_sel = regulator_set_voltage_sel_regmap, 194 .get_voltage_sel = regulator_get_voltage_sel_regmap, 195 .list_voltage = regulator_list_voltage_linear, 196 .set_current_limit = pv88090_set_current_limit, 197 .get_current_limit = pv88090_get_current_limit, 198 }; 199 200 static struct regulator_ops pv88090_ldo_ops = { 201 .enable = regulator_enable_regmap, 202 .disable = regulator_disable_regmap, 203 .is_enabled = regulator_is_enabled_regmap, 204 .set_voltage_sel = regulator_set_voltage_sel_regmap, 205 .get_voltage_sel = regulator_get_voltage_sel_regmap, 206 .list_voltage = regulator_list_voltage_linear, 207 }; 208 209 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \ 210 {\ 211 .desc = {\ 212 .id = chip##_ID_##regl_name,\ 213 .name = __stringify(chip##_##regl_name),\ 214 .of_match = of_match_ptr(#regl_name),\ 215 .regulators_node = of_match_ptr("regulators"),\ 216 .type = REGULATOR_VOLTAGE,\ 217 .owner = THIS_MODULE,\ 218 .ops = &pv88090_buck_ops,\ 219 .min_uV = min, \ 220 .uV_step = step, \ 221 .n_voltages = ((max) - (min))/(step) + 1, \ 222 .enable_reg = PV88090_REG_##regl_name##_CONF0, \ 223 .enable_mask = PV88090_##regl_name##_EN, \ 224 .vsel_reg = PV88090_REG_##regl_name##_CONF0, \ 225 .vsel_mask = PV88090_V##regl_name##_MASK, \ 226 },\ 227 .current_limits = limits_array, \ 228 .n_current_limits = ARRAY_SIZE(limits_array), \ 229 .limit_mask = PV88090_##regl_name##_ILIM_MASK, \ 230 .conf = PV88090_REG_##regl_name##_CONF1, \ 231 .conf2 = PV88090_REG_##regl_name##_CONF2, \ 232 } 233 234 #define PV88090_LDO(chip, regl_name, min, step, max) \ 235 {\ 236 .desc = {\ 237 .id = chip##_ID_##regl_name,\ 238 .name = __stringify(chip##_##regl_name),\ 239 .of_match = of_match_ptr(#regl_name),\ 240 .regulators_node = of_match_ptr("regulators"),\ 241 .type = REGULATOR_VOLTAGE,\ 242 .owner = THIS_MODULE,\ 243 .ops = &pv88090_ldo_ops,\ 244 .min_uV = min, \ 245 .uV_step = step, \ 246 .n_voltages = ((max) - (min))/(step) + 1, \ 247 .enable_reg = PV88090_REG_##regl_name##_CONT, \ 248 .enable_mask = PV88090_##regl_name##_EN, \ 249 .vsel_reg = PV88090_REG_##regl_name##_CONT, \ 250 .vsel_mask = PV88090_V##regl_name##_MASK, \ 251 },\ 252 } 253 254 static struct pv88090_regulator pv88090_regulator_info[] = { 255 PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750, 256 pv88090_buck1_limits), 257 PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750, 258 pv88090_buck23_limits), 259 PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750, 260 pv88090_buck23_limits), 261 PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000), 262 PV88090_LDO(PV88090, LDO2, 650000, 25000, 2225000), 263 }; 264 265 static irqreturn_t pv88090_irq_handler(int irq, void *data) 266 { 267 struct pv88090 *chip = data; 268 int i, reg_val, err, ret = IRQ_NONE; 269 270 err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, ®_val); 271 if (err < 0) 272 goto error_i2c; 273 274 if (reg_val & PV88090_E_VDD_FLT) { 275 for (i = 0; i < PV88090_MAX_REGULATORS; i++) { 276 if (chip->rdev[i] != NULL) { 277 regulator_notifier_call_chain(chip->rdev[i], 278 REGULATOR_EVENT_UNDER_VOLTAGE, 279 NULL); 280 } 281 } 282 283 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A, 284 PV88090_E_VDD_FLT); 285 if (err < 0) 286 goto error_i2c; 287 288 ret = IRQ_HANDLED; 289 } 290 291 if (reg_val & PV88090_E_OVER_TEMP) { 292 for (i = 0; i < PV88090_MAX_REGULATORS; i++) { 293 if (chip->rdev[i] != NULL) { 294 regulator_notifier_call_chain(chip->rdev[i], 295 REGULATOR_EVENT_OVER_TEMP, 296 NULL); 297 } 298 } 299 300 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A, 301 PV88090_E_OVER_TEMP); 302 if (err < 0) 303 goto error_i2c; 304 305 ret = IRQ_HANDLED; 306 } 307 308 return ret; 309 310 error_i2c: 311 dev_err(chip->dev, "I2C error : %d\n", err); 312 return IRQ_NONE; 313 } 314 315 /* 316 * I2C driver interface functions 317 */ 318 static int pv88090_i2c_probe(struct i2c_client *i2c, 319 const struct i2c_device_id *id) 320 { 321 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev); 322 struct pv88090 *chip; 323 struct regulator_config config = { }; 324 int error, i, ret = 0; 325 unsigned int conf2, range, index; 326 327 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL); 328 if (!chip) 329 return -ENOMEM; 330 331 chip->dev = &i2c->dev; 332 chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config); 333 if (IS_ERR(chip->regmap)) { 334 error = PTR_ERR(chip->regmap); 335 dev_err(chip->dev, "Failed to allocate register map: %d\n", 336 error); 337 return error; 338 } 339 340 i2c_set_clientdata(i2c, chip); 341 342 if (i2c->irq != 0) { 343 ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF); 344 if (ret < 0) { 345 dev_err(chip->dev, 346 "Failed to mask A reg: %d\n", ret); 347 return ret; 348 } 349 350 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF); 351 if (ret < 0) { 352 dev_err(chip->dev, 353 "Failed to mask B reg: %d\n", ret); 354 return ret; 355 } 356 357 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, 358 pv88090_irq_handler, 359 IRQF_TRIGGER_LOW|IRQF_ONESHOT, 360 "pv88090", chip); 361 if (ret != 0) { 362 dev_err(chip->dev, "Failed to request IRQ: %d\n", 363 i2c->irq); 364 return ret; 365 } 366 367 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A, 368 PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0); 369 if (ret < 0) { 370 dev_err(chip->dev, 371 "Failed to update mask reg: %d\n", ret); 372 return ret; 373 } 374 375 } else { 376 dev_warn(chip->dev, "No IRQ configured\n"); 377 } 378 379 config.dev = chip->dev; 380 config.regmap = chip->regmap; 381 382 for (i = 0; i < PV88090_MAX_REGULATORS; i++) { 383 if (init_data) 384 config.init_data = &init_data[i]; 385 386 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) { 387 ret = regmap_read(chip->regmap, 388 pv88090_regulator_info[i].conf2, &conf2); 389 if (ret < 0) 390 return ret; 391 392 conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) & 393 PV88090_BUCK_VDAC_RANGE_MASK; 394 395 ret = regmap_read(chip->regmap, 396 PV88090_REG_BUCK_FOLD_RANGE, &range); 397 if (ret < 0) 398 return ret; 399 400 range = (range >> 401 (PV88080_BUCK_VRANGE_GAIN_SHIFT + i - 1)) & 402 PV88080_BUCK_VRANGE_GAIN_MASK; 403 index = ((range << 1) | conf2); 404 405 pv88090_regulator_info[i].desc.min_uV 406 = pv88090_buck_vol[index].min_uV; 407 pv88090_regulator_info[i].desc.uV_step 408 = pv88090_buck_vol[index].uV_step; 409 pv88090_regulator_info[i].desc.n_voltages 410 = ((pv88090_buck_vol[index].max_uV) 411 - (pv88090_buck_vol[index].min_uV)) 412 /(pv88090_buck_vol[index].uV_step) + 1; 413 } 414 415 config.driver_data = (void *)&pv88090_regulator_info[i]; 416 chip->rdev[i] = devm_regulator_register(chip->dev, 417 &pv88090_regulator_info[i].desc, &config); 418 if (IS_ERR(chip->rdev[i])) { 419 dev_err(chip->dev, 420 "Failed to register PV88090 regulator\n"); 421 return PTR_ERR(chip->rdev[i]); 422 } 423 } 424 425 return 0; 426 } 427 428 static const struct i2c_device_id pv88090_i2c_id[] = { 429 {"pv88090", 0}, 430 {}, 431 }; 432 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id); 433 434 #ifdef CONFIG_OF 435 static const struct of_device_id pv88090_dt_ids[] = { 436 { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] }, 437 {}, 438 }; 439 MODULE_DEVICE_TABLE(of, pv88090_dt_ids); 440 #endif 441 442 static struct i2c_driver pv88090_regulator_driver = { 443 .driver = { 444 .name = "pv88090", 445 .of_match_table = of_match_ptr(pv88090_dt_ids), 446 }, 447 .probe = pv88090_i2c_probe, 448 .id_table = pv88090_i2c_id, 449 }; 450 451 module_i2c_driver(pv88090_regulator_driver); 452 453 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); 454 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090"); 455 MODULE_LICENSE("GPL"); 456