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/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/regulator/of_regulator.h> 28 #include <linux/proc_fs.h> 29 #include <linux/uaccess.h> 30 #include "pv88060-regulator.h" 31 32 #define PV88060_MAX_REGULATORS 14 33 34 /* PV88060 REGULATOR IDs */ 35 enum { 36 /* BUCKs */ 37 PV88060_ID_BUCK1, 38 39 /* LDOs */ 40 PV88060_ID_LDO1, 41 PV88060_ID_LDO2, 42 PV88060_ID_LDO3, 43 PV88060_ID_LDO4, 44 PV88060_ID_LDO5, 45 PV88060_ID_LDO6, 46 PV88060_ID_LDO7, 47 48 /* SWTs */ 49 PV88060_ID_SW1, 50 PV88060_ID_SW2, 51 PV88060_ID_SW3, 52 PV88060_ID_SW4, 53 PV88060_ID_SW5, 54 PV88060_ID_SW6, 55 }; 56 57 struct pv88060_regulator { 58 struct regulator_desc desc; 59 /* Current limiting */ 60 unsigned n_current_limits; 61 const int *current_limits; 62 unsigned int limit_mask; 63 unsigned int conf; /* buck configuration register */ 64 }; 65 66 struct pv88060 { 67 struct device *dev; 68 struct regmap *regmap; 69 struct regulator_dev *rdev[PV88060_MAX_REGULATORS]; 70 }; 71 72 static const struct regmap_config pv88060_regmap_config = { 73 .reg_bits = 8, 74 .val_bits = 8, 75 }; 76 77 /* Current limits array (in uA) for BUCK1 78 * Entry indexes corresponds to register values. 79 */ 80 81 static const int pv88060_buck1_limits[] = { 82 1496000, 2393000, 3291000, 4189000 83 }; 84 85 static unsigned int pv88060_buck_get_mode(struct regulator_dev *rdev) 86 { 87 struct pv88060_regulator *info = rdev_get_drvdata(rdev); 88 unsigned int data; 89 int ret, mode = 0; 90 91 ret = regmap_read(rdev->regmap, info->conf, &data); 92 if (ret < 0) 93 return ret; 94 95 switch (data & PV88060_BUCK_MODE_MASK) { 96 case PV88060_BUCK_MODE_SYNC: 97 mode = REGULATOR_MODE_FAST; 98 break; 99 case PV88060_BUCK_MODE_AUTO: 100 mode = REGULATOR_MODE_NORMAL; 101 break; 102 case PV88060_BUCK_MODE_SLEEP: 103 mode = REGULATOR_MODE_STANDBY; 104 break; 105 } 106 107 return mode; 108 } 109 110 static int pv88060_buck_set_mode(struct regulator_dev *rdev, 111 unsigned int mode) 112 { 113 struct pv88060_regulator *info = rdev_get_drvdata(rdev); 114 int val = 0; 115 116 switch (mode) { 117 case REGULATOR_MODE_FAST: 118 val = PV88060_BUCK_MODE_SYNC; 119 break; 120 case REGULATOR_MODE_NORMAL: 121 val = PV88060_BUCK_MODE_AUTO; 122 break; 123 case REGULATOR_MODE_STANDBY: 124 val = PV88060_BUCK_MODE_SLEEP; 125 break; 126 default: 127 return -EINVAL; 128 } 129 130 return regmap_update_bits(rdev->regmap, info->conf, 131 PV88060_BUCK_MODE_MASK, val); 132 } 133 134 static int pv88060_set_current_limit(struct regulator_dev *rdev, int min, 135 int max) 136 { 137 struct pv88060_regulator *info = rdev_get_drvdata(rdev); 138 int i; 139 140 /* search for closest to maximum */ 141 for (i = info->n_current_limits; i >= 0; i--) { 142 if (min <= info->current_limits[i] 143 && max >= info->current_limits[i]) { 144 return regmap_update_bits(rdev->regmap, 145 info->conf, 146 info->limit_mask, 147 i << PV88060_BUCK_ILIM_SHIFT); 148 } 149 } 150 151 return -EINVAL; 152 } 153 154 static int pv88060_get_current_limit(struct regulator_dev *rdev) 155 { 156 struct pv88060_regulator *info = rdev_get_drvdata(rdev); 157 unsigned int data; 158 int ret; 159 160 ret = regmap_read(rdev->regmap, info->conf, &data); 161 if (ret < 0) 162 return ret; 163 164 data = (data & info->limit_mask) >> PV88060_BUCK_ILIM_SHIFT; 165 return info->current_limits[data]; 166 } 167 168 static struct regulator_ops pv88060_buck_ops = { 169 .get_mode = pv88060_buck_get_mode, 170 .set_mode = pv88060_buck_set_mode, 171 .enable = regulator_enable_regmap, 172 .disable = regulator_disable_regmap, 173 .is_enabled = regulator_is_enabled_regmap, 174 .set_voltage_sel = regulator_set_voltage_sel_regmap, 175 .get_voltage_sel = regulator_get_voltage_sel_regmap, 176 .list_voltage = regulator_list_voltage_linear, 177 .set_current_limit = pv88060_set_current_limit, 178 .get_current_limit = pv88060_get_current_limit, 179 }; 180 181 static struct regulator_ops pv88060_ldo_ops = { 182 .enable = regulator_enable_regmap, 183 .disable = regulator_disable_regmap, 184 .is_enabled = regulator_is_enabled_regmap, 185 .set_voltage_sel = regulator_set_voltage_sel_regmap, 186 .get_voltage_sel = regulator_get_voltage_sel_regmap, 187 .list_voltage = regulator_list_voltage_linear, 188 }; 189 190 #define PV88060_BUCK(chip, regl_name, min, step, max, limits_array) \ 191 {\ 192 .desc = {\ 193 .id = chip##_ID_##regl_name,\ 194 .name = __stringify(chip##_##regl_name),\ 195 .of_match = of_match_ptr(#regl_name),\ 196 .regulators_node = of_match_ptr("regulators"),\ 197 .type = REGULATOR_VOLTAGE,\ 198 .owner = THIS_MODULE,\ 199 .ops = &pv88060_buck_ops,\ 200 .min_uV = min,\ 201 .uV_step = step,\ 202 .n_voltages = ((max) - (min))/(step) + 1,\ 203 .enable_reg = PV88060_REG_##regl_name##_CONF0,\ 204 .enable_mask = PV88060_BUCK_EN, \ 205 .vsel_reg = PV88060_REG_##regl_name##_CONF0,\ 206 .vsel_mask = PV88060_VBUCK_MASK,\ 207 },\ 208 .current_limits = limits_array,\ 209 .n_current_limits = ARRAY_SIZE(limits_array),\ 210 .limit_mask = PV88060_BUCK_ILIM_MASK, \ 211 .conf = PV88060_REG_##regl_name##_CONF1,\ 212 } 213 214 #define PV88060_LDO(chip, regl_name, min, step, max) \ 215 {\ 216 .desc = {\ 217 .id = chip##_ID_##regl_name,\ 218 .name = __stringify(chip##_##regl_name),\ 219 .of_match = of_match_ptr(#regl_name),\ 220 .regulators_node = of_match_ptr("regulators"),\ 221 .type = REGULATOR_VOLTAGE,\ 222 .owner = THIS_MODULE,\ 223 .ops = &pv88060_ldo_ops,\ 224 .min_uV = min, \ 225 .uV_step = step, \ 226 .n_voltages = (step) ? ((max - min) / step + 1) : 1, \ 227 .enable_reg = PV88060_REG_##regl_name##_CONF, \ 228 .enable_mask = PV88060_LDO_EN, \ 229 .vsel_reg = PV88060_REG_##regl_name##_CONF, \ 230 .vsel_mask = PV88060_VLDO_MASK, \ 231 },\ 232 } 233 234 #define PV88060_SW(chip, regl_name, 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 = &pv88060_ldo_ops,\ 244 .min_uV = max,\ 245 .uV_step = 0,\ 246 .n_voltages = 1,\ 247 .enable_reg = PV88060_REG_##regl_name##_CONF,\ 248 .enable_mask = PV88060_SW_EN,\ 249 },\ 250 } 251 252 static const struct pv88060_regulator pv88060_regulator_info[] = { 253 PV88060_BUCK(PV88060, BUCK1, 2800000, 12500, 4387500, 254 pv88060_buck1_limits), 255 PV88060_LDO(PV88060, LDO1, 1200000, 50000, 3350000), 256 PV88060_LDO(PV88060, LDO2, 1200000, 50000, 3350000), 257 PV88060_LDO(PV88060, LDO3, 1200000, 50000, 3350000), 258 PV88060_LDO(PV88060, LDO4, 1200000, 50000, 3350000), 259 PV88060_LDO(PV88060, LDO5, 1200000, 50000, 3350000), 260 PV88060_LDO(PV88060, LDO6, 1200000, 50000, 3350000), 261 PV88060_LDO(PV88060, LDO7, 1200000, 50000, 3350000), 262 PV88060_SW(PV88060, SW1, 5000000), 263 PV88060_SW(PV88060, SW2, 5000000), 264 PV88060_SW(PV88060, SW3, 5000000), 265 PV88060_SW(PV88060, SW4, 5000000), 266 PV88060_SW(PV88060, SW5, 5000000), 267 PV88060_SW(PV88060, SW6, 5000000), 268 }; 269 270 static irqreturn_t pv88060_irq_handler(int irq, void *data) 271 { 272 struct pv88060 *chip = data; 273 int i, reg_val, err, ret = IRQ_NONE; 274 275 err = regmap_read(chip->regmap, PV88060_REG_EVENT_A, ®_val); 276 if (err < 0) 277 goto error_i2c; 278 279 if (reg_val & PV88060_E_VDD_FLT) { 280 for (i = 0; i < PV88060_MAX_REGULATORS; i++) { 281 if (chip->rdev[i] != NULL) { 282 regulator_notifier_call_chain(chip->rdev[i], 283 REGULATOR_EVENT_UNDER_VOLTAGE, 284 NULL); 285 } 286 } 287 288 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A, 289 PV88060_E_VDD_FLT); 290 if (err < 0) 291 goto error_i2c; 292 293 ret = IRQ_HANDLED; 294 } 295 296 if (reg_val & PV88060_E_OVER_TEMP) { 297 for (i = 0; i < PV88060_MAX_REGULATORS; i++) { 298 if (chip->rdev[i] != NULL) { 299 regulator_notifier_call_chain(chip->rdev[i], 300 REGULATOR_EVENT_OVER_TEMP, 301 NULL); 302 } 303 } 304 305 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A, 306 PV88060_E_OVER_TEMP); 307 if (err < 0) 308 goto error_i2c; 309 310 ret = IRQ_HANDLED; 311 } 312 313 return ret; 314 315 error_i2c: 316 dev_err(chip->dev, "I2C error : %d\n", err); 317 return IRQ_NONE; 318 } 319 320 /* 321 * I2C driver interface functions 322 */ 323 static int pv88060_i2c_probe(struct i2c_client *i2c, 324 const struct i2c_device_id *id) 325 { 326 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev); 327 struct pv88060 *chip; 328 struct regulator_config config = { }; 329 int error, i, ret = 0; 330 331 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88060), GFP_KERNEL); 332 if (!chip) 333 return -ENOMEM; 334 335 chip->dev = &i2c->dev; 336 chip->regmap = devm_regmap_init_i2c(i2c, &pv88060_regmap_config); 337 if (IS_ERR(chip->regmap)) { 338 error = PTR_ERR(chip->regmap); 339 dev_err(chip->dev, "Failed to allocate register map: %d\n", 340 error); 341 return error; 342 } 343 344 i2c_set_clientdata(i2c, chip); 345 346 if (i2c->irq != 0) { 347 ret = regmap_write(chip->regmap, PV88060_REG_MASK_A, 0xFF); 348 if (ret < 0) { 349 dev_err(chip->dev, 350 "Failed to mask A reg: %d\n", ret); 351 return ret; 352 } 353 354 ret = regmap_write(chip->regmap, PV88060_REG_MASK_B, 0xFF); 355 if (ret < 0) { 356 dev_err(chip->dev, 357 "Failed to mask B reg: %d\n", ret); 358 return ret; 359 } 360 361 ret = regmap_write(chip->regmap, PV88060_REG_MASK_C, 0xFF); 362 if (ret < 0) { 363 dev_err(chip->dev, 364 "Failed to mask C reg: %d\n", ret); 365 return ret; 366 } 367 368 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, 369 pv88060_irq_handler, 370 IRQF_TRIGGER_LOW|IRQF_ONESHOT, 371 "pv88060", chip); 372 if (ret != 0) { 373 dev_err(chip->dev, "Failed to request IRQ: %d\n", 374 i2c->irq); 375 return ret; 376 } 377 378 ret = regmap_update_bits(chip->regmap, PV88060_REG_MASK_A, 379 PV88060_M_VDD_FLT | PV88060_M_OVER_TEMP, 0); 380 if (ret < 0) { 381 dev_err(chip->dev, 382 "Failed to update mask reg: %d\n", ret); 383 return ret; 384 } 385 386 } else { 387 dev_warn(chip->dev, "No IRQ configured\n"); 388 } 389 390 config.dev = chip->dev; 391 config.regmap = chip->regmap; 392 393 for (i = 0; i < PV88060_MAX_REGULATORS; i++) { 394 if (init_data) 395 config.init_data = &init_data[i]; 396 397 config.driver_data = (void *)&pv88060_regulator_info[i]; 398 chip->rdev[i] = devm_regulator_register(chip->dev, 399 &pv88060_regulator_info[i].desc, &config); 400 if (IS_ERR(chip->rdev[i])) { 401 dev_err(chip->dev, 402 "Failed to register PV88060 regulator\n"); 403 return PTR_ERR(chip->rdev[i]); 404 } 405 } 406 407 return 0; 408 } 409 410 static const struct i2c_device_id pv88060_i2c_id[] = { 411 {"pv88060", 0}, 412 {}, 413 }; 414 MODULE_DEVICE_TABLE(i2c, pv88060_i2c_id); 415 416 #ifdef CONFIG_OF 417 static const struct of_device_id pv88060_dt_ids[] = { 418 { .compatible = "pvs,pv88060", .data = &pv88060_i2c_id[0] }, 419 {}, 420 }; 421 MODULE_DEVICE_TABLE(of, pv88060_dt_ids); 422 #endif 423 424 static struct i2c_driver pv88060_regulator_driver = { 425 .driver = { 426 .name = "pv88060", 427 .of_match_table = of_match_ptr(pv88060_dt_ids), 428 }, 429 .probe = pv88060_i2c_probe, 430 .id_table = pv88060_i2c_id, 431 }; 432 433 module_i2c_driver(pv88060_regulator_driver); 434 435 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); 436 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88060"); 437 MODULE_LICENSE("GPL"); 438