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 unsigned int conf; 46 unsigned int conf2; 47 }; 48 49 struct pv88090 { 50 struct device *dev; 51 struct regmap *regmap; 52 struct regulator_dev *rdev[PV88090_MAX_REGULATORS]; 53 }; 54 55 struct pv88090_buck_voltage { 56 int min_uV; 57 int max_uV; 58 int uV_step; 59 }; 60 61 static const struct regmap_config pv88090_regmap_config = { 62 .reg_bits = 8, 63 .val_bits = 8, 64 }; 65 66 /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3. 67 * Entry indexes corresponds to register values. 68 */ 69 70 static const unsigned int pv88090_buck1_limits[] = { 71 220000, 440000, 660000, 880000, 1100000, 1320000, 1540000, 1760000, 72 1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000, 73 3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000, 74 5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000 75 }; 76 77 static const unsigned int pv88090_buck23_limits[] = { 78 1496000, 2393000, 3291000, 4189000 79 }; 80 81 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = { 82 { 83 .min_uV = 600000, 84 .max_uV = 1393750, 85 .uV_step = 6250, 86 }, 87 88 { 89 .min_uV = 1400000, 90 .max_uV = 2193750, 91 .uV_step = 6250, 92 }, 93 { 94 .min_uV = 1250000, 95 .max_uV = 2837500, 96 .uV_step = 12500, 97 }, 98 }; 99 100 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev) 101 { 102 struct pv88090_regulator *info = rdev_get_drvdata(rdev); 103 unsigned int data; 104 int ret, mode = 0; 105 106 ret = regmap_read(rdev->regmap, info->conf, &data); 107 if (ret < 0) 108 return ret; 109 110 switch (data & PV88090_BUCK1_MODE_MASK) { 111 case PV88090_BUCK_MODE_SYNC: 112 mode = REGULATOR_MODE_FAST; 113 break; 114 case PV88090_BUCK_MODE_AUTO: 115 mode = REGULATOR_MODE_NORMAL; 116 break; 117 case PV88090_BUCK_MODE_SLEEP: 118 mode = REGULATOR_MODE_STANDBY; 119 break; 120 } 121 122 return mode; 123 } 124 125 static int pv88090_buck_set_mode(struct regulator_dev *rdev, 126 unsigned int mode) 127 { 128 struct pv88090_regulator *info = rdev_get_drvdata(rdev); 129 int val = 0; 130 131 switch (mode) { 132 case REGULATOR_MODE_FAST: 133 val = PV88090_BUCK_MODE_SYNC; 134 break; 135 case REGULATOR_MODE_NORMAL: 136 val = PV88090_BUCK_MODE_AUTO; 137 break; 138 case REGULATOR_MODE_STANDBY: 139 val = PV88090_BUCK_MODE_SLEEP; 140 break; 141 default: 142 return -EINVAL; 143 } 144 145 return regmap_update_bits(rdev->regmap, info->conf, 146 PV88090_BUCK1_MODE_MASK, val); 147 } 148 149 static const struct regulator_ops pv88090_buck_ops = { 150 .get_mode = pv88090_buck_get_mode, 151 .set_mode = pv88090_buck_set_mode, 152 .enable = regulator_enable_regmap, 153 .disable = regulator_disable_regmap, 154 .is_enabled = regulator_is_enabled_regmap, 155 .set_voltage_sel = regulator_set_voltage_sel_regmap, 156 .get_voltage_sel = regulator_get_voltage_sel_regmap, 157 .list_voltage = regulator_list_voltage_linear, 158 .set_current_limit = regulator_set_current_limit_regmap, 159 .get_current_limit = regulator_get_current_limit_regmap, 160 }; 161 162 static const struct regulator_ops pv88090_ldo_ops = { 163 .enable = regulator_enable_regmap, 164 .disable = regulator_disable_regmap, 165 .is_enabled = regulator_is_enabled_regmap, 166 .set_voltage_sel = regulator_set_voltage_sel_regmap, 167 .get_voltage_sel = regulator_get_voltage_sel_regmap, 168 .list_voltage = regulator_list_voltage_linear, 169 }; 170 171 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \ 172 {\ 173 .desc = {\ 174 .id = chip##_ID_##regl_name,\ 175 .name = __stringify(chip##_##regl_name),\ 176 .of_match = of_match_ptr(#regl_name),\ 177 .regulators_node = of_match_ptr("regulators"),\ 178 .type = REGULATOR_VOLTAGE,\ 179 .owner = THIS_MODULE,\ 180 .ops = &pv88090_buck_ops,\ 181 .min_uV = min, \ 182 .uV_step = step, \ 183 .n_voltages = ((max) - (min))/(step) + 1, \ 184 .enable_reg = PV88090_REG_##regl_name##_CONF0, \ 185 .enable_mask = PV88090_##regl_name##_EN, \ 186 .vsel_reg = PV88090_REG_##regl_name##_CONF0, \ 187 .vsel_mask = PV88090_V##regl_name##_MASK, \ 188 .curr_table = limits_array, \ 189 .n_current_limits = ARRAY_SIZE(limits_array), \ 190 .csel_reg = PV88090_REG_##regl_name##_CONF1, \ 191 .csel_mask = PV88090_##regl_name##_ILIM_MASK, \ 192 },\ 193 .conf = PV88090_REG_##regl_name##_CONF1, \ 194 .conf2 = PV88090_REG_##regl_name##_CONF2, \ 195 } 196 197 #define PV88090_LDO(chip, regl_name, min, step, max) \ 198 {\ 199 .desc = {\ 200 .id = chip##_ID_##regl_name,\ 201 .name = __stringify(chip##_##regl_name),\ 202 .of_match = of_match_ptr(#regl_name),\ 203 .regulators_node = of_match_ptr("regulators"),\ 204 .type = REGULATOR_VOLTAGE,\ 205 .owner = THIS_MODULE,\ 206 .ops = &pv88090_ldo_ops,\ 207 .min_uV = min, \ 208 .uV_step = step, \ 209 .n_voltages = ((max) - (min))/(step) + 1, \ 210 .enable_reg = PV88090_REG_##regl_name##_CONT, \ 211 .enable_mask = PV88090_##regl_name##_EN, \ 212 .vsel_reg = PV88090_REG_##regl_name##_CONT, \ 213 .vsel_mask = PV88090_V##regl_name##_MASK, \ 214 },\ 215 } 216 217 static struct pv88090_regulator pv88090_regulator_info[] = { 218 PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750, 219 pv88090_buck1_limits), 220 PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750, 221 pv88090_buck23_limits), 222 PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750, 223 pv88090_buck23_limits), 224 PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000), 225 PV88090_LDO(PV88090, LDO2, 650000, 25000, 2225000), 226 }; 227 228 static irqreturn_t pv88090_irq_handler(int irq, void *data) 229 { 230 struct pv88090 *chip = data; 231 int i, reg_val, err, ret = IRQ_NONE; 232 233 err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, ®_val); 234 if (err < 0) 235 goto error_i2c; 236 237 if (reg_val & PV88090_E_VDD_FLT) { 238 for (i = 0; i < PV88090_MAX_REGULATORS; i++) { 239 if (chip->rdev[i] != NULL) { 240 regulator_notifier_call_chain(chip->rdev[i], 241 REGULATOR_EVENT_UNDER_VOLTAGE, 242 NULL); 243 } 244 } 245 246 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A, 247 PV88090_E_VDD_FLT); 248 if (err < 0) 249 goto error_i2c; 250 251 ret = IRQ_HANDLED; 252 } 253 254 if (reg_val & PV88090_E_OVER_TEMP) { 255 for (i = 0; i < PV88090_MAX_REGULATORS; i++) { 256 if (chip->rdev[i] != NULL) { 257 regulator_notifier_call_chain(chip->rdev[i], 258 REGULATOR_EVENT_OVER_TEMP, 259 NULL); 260 } 261 } 262 263 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A, 264 PV88090_E_OVER_TEMP); 265 if (err < 0) 266 goto error_i2c; 267 268 ret = IRQ_HANDLED; 269 } 270 271 return ret; 272 273 error_i2c: 274 dev_err(chip->dev, "I2C error : %d\n", err); 275 return IRQ_NONE; 276 } 277 278 /* 279 * I2C driver interface functions 280 */ 281 static int pv88090_i2c_probe(struct i2c_client *i2c, 282 const struct i2c_device_id *id) 283 { 284 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev); 285 struct pv88090 *chip; 286 struct regulator_config config = { }; 287 int error, i, ret = 0; 288 unsigned int conf2, range, index; 289 290 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL); 291 if (!chip) 292 return -ENOMEM; 293 294 chip->dev = &i2c->dev; 295 chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config); 296 if (IS_ERR(chip->regmap)) { 297 error = PTR_ERR(chip->regmap); 298 dev_err(chip->dev, "Failed to allocate register map: %d\n", 299 error); 300 return error; 301 } 302 303 i2c_set_clientdata(i2c, chip); 304 305 if (i2c->irq != 0) { 306 ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF); 307 if (ret < 0) { 308 dev_err(chip->dev, 309 "Failed to mask A reg: %d\n", ret); 310 return ret; 311 } 312 313 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF); 314 if (ret < 0) { 315 dev_err(chip->dev, 316 "Failed to mask B reg: %d\n", ret); 317 return ret; 318 } 319 320 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, 321 pv88090_irq_handler, 322 IRQF_TRIGGER_LOW|IRQF_ONESHOT, 323 "pv88090", chip); 324 if (ret != 0) { 325 dev_err(chip->dev, "Failed to request IRQ: %d\n", 326 i2c->irq); 327 return ret; 328 } 329 330 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A, 331 PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0); 332 if (ret < 0) { 333 dev_err(chip->dev, 334 "Failed to update mask reg: %d\n", ret); 335 return ret; 336 } 337 338 } else { 339 dev_warn(chip->dev, "No IRQ configured\n"); 340 } 341 342 config.dev = chip->dev; 343 config.regmap = chip->regmap; 344 345 for (i = 0; i < PV88090_MAX_REGULATORS; i++) { 346 if (init_data) 347 config.init_data = &init_data[i]; 348 349 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) { 350 ret = regmap_read(chip->regmap, 351 pv88090_regulator_info[i].conf2, &conf2); 352 if (ret < 0) 353 return ret; 354 355 conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) & 356 PV88090_BUCK_VDAC_RANGE_MASK; 357 358 ret = regmap_read(chip->regmap, 359 PV88090_REG_BUCK_FOLD_RANGE, &range); 360 if (ret < 0) 361 return ret; 362 363 range = (range >> 364 (PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) & 365 PV88090_BUCK_VRANGE_GAIN_MASK; 366 index = ((range << 1) | conf2); 367 if (index > PV88090_ID_BUCK3) { 368 dev_err(chip->dev, 369 "Invalid index(%d)\n", index); 370 return -EINVAL; 371 } 372 373 pv88090_regulator_info[i].desc.min_uV 374 = pv88090_buck_vol[index].min_uV; 375 pv88090_regulator_info[i].desc.uV_step 376 = pv88090_buck_vol[index].uV_step; 377 pv88090_regulator_info[i].desc.n_voltages 378 = ((pv88090_buck_vol[index].max_uV) 379 - (pv88090_buck_vol[index].min_uV)) 380 /(pv88090_buck_vol[index].uV_step) + 1; 381 } 382 383 config.driver_data = (void *)&pv88090_regulator_info[i]; 384 chip->rdev[i] = devm_regulator_register(chip->dev, 385 &pv88090_regulator_info[i].desc, &config); 386 if (IS_ERR(chip->rdev[i])) { 387 dev_err(chip->dev, 388 "Failed to register PV88090 regulator\n"); 389 return PTR_ERR(chip->rdev[i]); 390 } 391 } 392 393 return 0; 394 } 395 396 static const struct i2c_device_id pv88090_i2c_id[] = { 397 {"pv88090", 0}, 398 {}, 399 }; 400 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id); 401 402 #ifdef CONFIG_OF 403 static const struct of_device_id pv88090_dt_ids[] = { 404 { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] }, 405 {}, 406 }; 407 MODULE_DEVICE_TABLE(of, pv88090_dt_ids); 408 #endif 409 410 static struct i2c_driver pv88090_regulator_driver = { 411 .driver = { 412 .name = "pv88090", 413 .of_match_table = of_match_ptr(pv88090_dt_ids), 414 }, 415 .probe = pv88090_i2c_probe, 416 .id_table = pv88090_i2c_id, 417 }; 418 419 module_i2c_driver(pv88090_regulator_driver); 420 421 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); 422 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090"); 423 MODULE_LICENSE("GPL"); 424