1 /* 2 * pv88060-regulator.c - Regulator device driver for PV88060 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 "pv88060-regulator.h" 28 29 #define PV88060_MAX_REGULATORS 14 30 31 /* PV88060 REGULATOR IDs */ 32 enum { 33 /* BUCKs */ 34 PV88060_ID_BUCK1, 35 36 /* LDOs */ 37 PV88060_ID_LDO1, 38 PV88060_ID_LDO2, 39 PV88060_ID_LDO3, 40 PV88060_ID_LDO4, 41 PV88060_ID_LDO5, 42 PV88060_ID_LDO6, 43 PV88060_ID_LDO7, 44 45 /* SWTs */ 46 PV88060_ID_SW1, 47 PV88060_ID_SW2, 48 PV88060_ID_SW3, 49 PV88060_ID_SW4, 50 PV88060_ID_SW5, 51 PV88060_ID_SW6, 52 }; 53 54 struct pv88060_regulator { 55 struct regulator_desc desc; 56 /* Current limiting */ 57 unsigned n_current_limits; 58 const int *current_limits; 59 unsigned int limit_mask; 60 unsigned int conf; /* buck configuration register */ 61 }; 62 63 struct pv88060 { 64 struct device *dev; 65 struct regmap *regmap; 66 struct regulator_dev *rdev[PV88060_MAX_REGULATORS]; 67 }; 68 69 static const struct regmap_config pv88060_regmap_config = { 70 .reg_bits = 8, 71 .val_bits = 8, 72 }; 73 74 /* Current limits array (in uA) for BUCK1 75 * Entry indexes corresponds to register values. 76 */ 77 78 static const int pv88060_buck1_limits[] = { 79 1496000, 2393000, 3291000, 4189000 80 }; 81 82 static unsigned int pv88060_buck_get_mode(struct regulator_dev *rdev) 83 { 84 struct pv88060_regulator *info = rdev_get_drvdata(rdev); 85 unsigned int data; 86 int ret, mode = 0; 87 88 ret = regmap_read(rdev->regmap, info->conf, &data); 89 if (ret < 0) 90 return ret; 91 92 switch (data & PV88060_BUCK_MODE_MASK) { 93 case PV88060_BUCK_MODE_SYNC: 94 mode = REGULATOR_MODE_FAST; 95 break; 96 case PV88060_BUCK_MODE_AUTO: 97 mode = REGULATOR_MODE_NORMAL; 98 break; 99 case PV88060_BUCK_MODE_SLEEP: 100 mode = REGULATOR_MODE_STANDBY; 101 break; 102 } 103 104 return mode; 105 } 106 107 static int pv88060_buck_set_mode(struct regulator_dev *rdev, 108 unsigned int mode) 109 { 110 struct pv88060_regulator *info = rdev_get_drvdata(rdev); 111 int val = 0; 112 113 switch (mode) { 114 case REGULATOR_MODE_FAST: 115 val = PV88060_BUCK_MODE_SYNC; 116 break; 117 case REGULATOR_MODE_NORMAL: 118 val = PV88060_BUCK_MODE_AUTO; 119 break; 120 case REGULATOR_MODE_STANDBY: 121 val = PV88060_BUCK_MODE_SLEEP; 122 break; 123 default: 124 return -EINVAL; 125 } 126 127 return regmap_update_bits(rdev->regmap, info->conf, 128 PV88060_BUCK_MODE_MASK, val); 129 } 130 131 static int pv88060_set_current_limit(struct regulator_dev *rdev, int min, 132 int max) 133 { 134 struct pv88060_regulator *info = rdev_get_drvdata(rdev); 135 int i; 136 137 /* search for closest to maximum */ 138 for (i = info->n_current_limits; i >= 0; i--) { 139 if (min <= info->current_limits[i] 140 && max >= info->current_limits[i]) { 141 return regmap_update_bits(rdev->regmap, 142 info->conf, 143 info->limit_mask, 144 i << PV88060_BUCK_ILIM_SHIFT); 145 } 146 } 147 148 return -EINVAL; 149 } 150 151 static int pv88060_get_current_limit(struct regulator_dev *rdev) 152 { 153 struct pv88060_regulator *info = rdev_get_drvdata(rdev); 154 unsigned int data; 155 int ret; 156 157 ret = regmap_read(rdev->regmap, info->conf, &data); 158 if (ret < 0) 159 return ret; 160 161 data = (data & info->limit_mask) >> PV88060_BUCK_ILIM_SHIFT; 162 return info->current_limits[data]; 163 } 164 165 static const struct regulator_ops pv88060_buck_ops = { 166 .get_mode = pv88060_buck_get_mode, 167 .set_mode = pv88060_buck_set_mode, 168 .enable = regulator_enable_regmap, 169 .disable = regulator_disable_regmap, 170 .is_enabled = regulator_is_enabled_regmap, 171 .set_voltage_sel = regulator_set_voltage_sel_regmap, 172 .get_voltage_sel = regulator_get_voltage_sel_regmap, 173 .list_voltage = regulator_list_voltage_linear, 174 .set_current_limit = pv88060_set_current_limit, 175 .get_current_limit = pv88060_get_current_limit, 176 }; 177 178 static const struct regulator_ops pv88060_ldo_ops = { 179 .enable = regulator_enable_regmap, 180 .disable = regulator_disable_regmap, 181 .is_enabled = regulator_is_enabled_regmap, 182 .set_voltage_sel = regulator_set_voltage_sel_regmap, 183 .get_voltage_sel = regulator_get_voltage_sel_regmap, 184 .list_voltage = regulator_list_voltage_linear, 185 }; 186 187 #define PV88060_BUCK(chip, regl_name, min, step, max, limits_array) \ 188 {\ 189 .desc = {\ 190 .id = chip##_ID_##regl_name,\ 191 .name = __stringify(chip##_##regl_name),\ 192 .of_match = of_match_ptr(#regl_name),\ 193 .regulators_node = of_match_ptr("regulators"),\ 194 .type = REGULATOR_VOLTAGE,\ 195 .owner = THIS_MODULE,\ 196 .ops = &pv88060_buck_ops,\ 197 .min_uV = min,\ 198 .uV_step = step,\ 199 .n_voltages = ((max) - (min))/(step) + 1,\ 200 .enable_reg = PV88060_REG_##regl_name##_CONF0,\ 201 .enable_mask = PV88060_BUCK_EN, \ 202 .vsel_reg = PV88060_REG_##regl_name##_CONF0,\ 203 .vsel_mask = PV88060_VBUCK_MASK,\ 204 },\ 205 .current_limits = limits_array,\ 206 .n_current_limits = ARRAY_SIZE(limits_array),\ 207 .limit_mask = PV88060_BUCK_ILIM_MASK, \ 208 .conf = PV88060_REG_##regl_name##_CONF1,\ 209 } 210 211 #define PV88060_LDO(chip, regl_name, min, step, max) \ 212 {\ 213 .desc = {\ 214 .id = chip##_ID_##regl_name,\ 215 .name = __stringify(chip##_##regl_name),\ 216 .of_match = of_match_ptr(#regl_name),\ 217 .regulators_node = of_match_ptr("regulators"),\ 218 .type = REGULATOR_VOLTAGE,\ 219 .owner = THIS_MODULE,\ 220 .ops = &pv88060_ldo_ops,\ 221 .min_uV = min, \ 222 .uV_step = step, \ 223 .n_voltages = (step) ? ((max - min) / step + 1) : 1, \ 224 .enable_reg = PV88060_REG_##regl_name##_CONF, \ 225 .enable_mask = PV88060_LDO_EN, \ 226 .vsel_reg = PV88060_REG_##regl_name##_CONF, \ 227 .vsel_mask = PV88060_VLDO_MASK, \ 228 },\ 229 } 230 231 #define PV88060_SW(chip, regl_name, max) \ 232 {\ 233 .desc = {\ 234 .id = chip##_ID_##regl_name,\ 235 .name = __stringify(chip##_##regl_name),\ 236 .of_match = of_match_ptr(#regl_name),\ 237 .regulators_node = of_match_ptr("regulators"),\ 238 .type = REGULATOR_VOLTAGE,\ 239 .owner = THIS_MODULE,\ 240 .ops = &pv88060_ldo_ops,\ 241 .min_uV = max,\ 242 .uV_step = 0,\ 243 .n_voltages = 1,\ 244 .enable_reg = PV88060_REG_##regl_name##_CONF,\ 245 .enable_mask = PV88060_SW_EN,\ 246 },\ 247 } 248 249 static const struct pv88060_regulator pv88060_regulator_info[] = { 250 PV88060_BUCK(PV88060, BUCK1, 2800000, 12500, 4387500, 251 pv88060_buck1_limits), 252 PV88060_LDO(PV88060, LDO1, 1200000, 50000, 3350000), 253 PV88060_LDO(PV88060, LDO2, 1200000, 50000, 3350000), 254 PV88060_LDO(PV88060, LDO3, 1200000, 50000, 3350000), 255 PV88060_LDO(PV88060, LDO4, 1200000, 50000, 3350000), 256 PV88060_LDO(PV88060, LDO5, 1200000, 50000, 3350000), 257 PV88060_LDO(PV88060, LDO6, 1200000, 50000, 3350000), 258 PV88060_LDO(PV88060, LDO7, 1200000, 50000, 3350000), 259 PV88060_SW(PV88060, SW1, 5000000), 260 PV88060_SW(PV88060, SW2, 5000000), 261 PV88060_SW(PV88060, SW3, 5000000), 262 PV88060_SW(PV88060, SW4, 5000000), 263 PV88060_SW(PV88060, SW5, 5000000), 264 PV88060_SW(PV88060, SW6, 5000000), 265 }; 266 267 static irqreturn_t pv88060_irq_handler(int irq, void *data) 268 { 269 struct pv88060 *chip = data; 270 int i, reg_val, err, ret = IRQ_NONE; 271 272 err = regmap_read(chip->regmap, PV88060_REG_EVENT_A, ®_val); 273 if (err < 0) 274 goto error_i2c; 275 276 if (reg_val & PV88060_E_VDD_FLT) { 277 for (i = 0; i < PV88060_MAX_REGULATORS; i++) { 278 if (chip->rdev[i] != NULL) { 279 regulator_notifier_call_chain(chip->rdev[i], 280 REGULATOR_EVENT_UNDER_VOLTAGE, 281 NULL); 282 } 283 } 284 285 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A, 286 PV88060_E_VDD_FLT); 287 if (err < 0) 288 goto error_i2c; 289 290 ret = IRQ_HANDLED; 291 } 292 293 if (reg_val & PV88060_E_OVER_TEMP) { 294 for (i = 0; i < PV88060_MAX_REGULATORS; i++) { 295 if (chip->rdev[i] != NULL) { 296 regulator_notifier_call_chain(chip->rdev[i], 297 REGULATOR_EVENT_OVER_TEMP, 298 NULL); 299 } 300 } 301 302 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A, 303 PV88060_E_OVER_TEMP); 304 if (err < 0) 305 goto error_i2c; 306 307 ret = IRQ_HANDLED; 308 } 309 310 return ret; 311 312 error_i2c: 313 dev_err(chip->dev, "I2C error : %d\n", err); 314 return IRQ_NONE; 315 } 316 317 /* 318 * I2C driver interface functions 319 */ 320 static int pv88060_i2c_probe(struct i2c_client *i2c, 321 const struct i2c_device_id *id) 322 { 323 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev); 324 struct pv88060 *chip; 325 struct regulator_config config = { }; 326 int error, i, ret = 0; 327 328 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88060), GFP_KERNEL); 329 if (!chip) 330 return -ENOMEM; 331 332 chip->dev = &i2c->dev; 333 chip->regmap = devm_regmap_init_i2c(i2c, &pv88060_regmap_config); 334 if (IS_ERR(chip->regmap)) { 335 error = PTR_ERR(chip->regmap); 336 dev_err(chip->dev, "Failed to allocate register map: %d\n", 337 error); 338 return error; 339 } 340 341 i2c_set_clientdata(i2c, chip); 342 343 if (i2c->irq != 0) { 344 ret = regmap_write(chip->regmap, PV88060_REG_MASK_A, 0xFF); 345 if (ret < 0) { 346 dev_err(chip->dev, 347 "Failed to mask A reg: %d\n", ret); 348 return ret; 349 } 350 351 ret = regmap_write(chip->regmap, PV88060_REG_MASK_B, 0xFF); 352 if (ret < 0) { 353 dev_err(chip->dev, 354 "Failed to mask B reg: %d\n", ret); 355 return ret; 356 } 357 358 ret = regmap_write(chip->regmap, PV88060_REG_MASK_C, 0xFF); 359 if (ret < 0) { 360 dev_err(chip->dev, 361 "Failed to mask C reg: %d\n", ret); 362 return ret; 363 } 364 365 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, 366 pv88060_irq_handler, 367 IRQF_TRIGGER_LOW|IRQF_ONESHOT, 368 "pv88060", chip); 369 if (ret != 0) { 370 dev_err(chip->dev, "Failed to request IRQ: %d\n", 371 i2c->irq); 372 return ret; 373 } 374 375 ret = regmap_update_bits(chip->regmap, PV88060_REG_MASK_A, 376 PV88060_M_VDD_FLT | PV88060_M_OVER_TEMP, 0); 377 if (ret < 0) { 378 dev_err(chip->dev, 379 "Failed to update mask reg: %d\n", ret); 380 return ret; 381 } 382 383 } else { 384 dev_warn(chip->dev, "No IRQ configured\n"); 385 } 386 387 config.dev = chip->dev; 388 config.regmap = chip->regmap; 389 390 for (i = 0; i < PV88060_MAX_REGULATORS; i++) { 391 if (init_data) 392 config.init_data = &init_data[i]; 393 394 config.driver_data = (void *)&pv88060_regulator_info[i]; 395 chip->rdev[i] = devm_regulator_register(chip->dev, 396 &pv88060_regulator_info[i].desc, &config); 397 if (IS_ERR(chip->rdev[i])) { 398 dev_err(chip->dev, 399 "Failed to register PV88060 regulator\n"); 400 return PTR_ERR(chip->rdev[i]); 401 } 402 } 403 404 return 0; 405 } 406 407 static const struct i2c_device_id pv88060_i2c_id[] = { 408 {"pv88060", 0}, 409 {}, 410 }; 411 MODULE_DEVICE_TABLE(i2c, pv88060_i2c_id); 412 413 #ifdef CONFIG_OF 414 static const struct of_device_id pv88060_dt_ids[] = { 415 { .compatible = "pvs,pv88060", .data = &pv88060_i2c_id[0] }, 416 {}, 417 }; 418 MODULE_DEVICE_TABLE(of, pv88060_dt_ids); 419 #endif 420 421 static struct i2c_driver pv88060_regulator_driver = { 422 .driver = { 423 .name = "pv88060", 424 .of_match_table = of_match_ptr(pv88060_dt_ids), 425 }, 426 .probe = pv88060_i2c_probe, 427 .id_table = pv88060_i2c_id, 428 }; 429 430 module_i2c_driver(pv88060_regulator_driver); 431 432 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); 433 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88060"); 434 MODULE_LICENSE("GPL"); 435