1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // pv88090-regulator.c - Regulator device driver for PV88090 4 // Copyright (C) 2015 Powerventure Semiconductor Ltd. 5 6 #include <linux/err.h> 7 #include <linux/i2c.h> 8 #include <linux/module.h> 9 #include <linux/init.h> 10 #include <linux/slab.h> 11 #include <linux/regulator/driver.h> 12 #include <linux/regulator/machine.h> 13 #include <linux/regmap.h> 14 #include <linux/irq.h> 15 #include <linux/interrupt.h> 16 #include <linux/regulator/of_regulator.h> 17 #include "pv88090-regulator.h" 18 19 #define PV88090_MAX_REGULATORS 5 20 21 /* PV88090 REGULATOR IDs */ 22 enum { 23 /* BUCKs */ 24 PV88090_ID_BUCK1, 25 PV88090_ID_BUCK2, 26 PV88090_ID_BUCK3, 27 28 /* LDOs */ 29 PV88090_ID_LDO1, 30 PV88090_ID_LDO2, 31 }; 32 33 struct pv88090_regulator { 34 struct regulator_desc desc; 35 unsigned int conf; 36 unsigned int conf2; 37 }; 38 39 struct pv88090 { 40 struct device *dev; 41 struct regmap *regmap; 42 struct regulator_dev *rdev[PV88090_MAX_REGULATORS]; 43 }; 44 45 struct pv88090_buck_voltage { 46 int min_uV; 47 int max_uV; 48 int uV_step; 49 }; 50 51 static const struct regmap_config pv88090_regmap_config = { 52 .reg_bits = 8, 53 .val_bits = 8, 54 }; 55 56 /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3. 57 * Entry indexes corresponds to register values. 58 */ 59 60 static const unsigned int pv88090_buck1_limits[] = { 61 220000, 440000, 660000, 880000, 1100000, 1320000, 1540000, 1760000, 62 1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000, 63 3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000, 64 5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000 65 }; 66 67 static const unsigned int pv88090_buck23_limits[] = { 68 1496000, 2393000, 3291000, 4189000 69 }; 70 71 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = { 72 { 73 .min_uV = 600000, 74 .max_uV = 1393750, 75 .uV_step = 6250, 76 }, 77 78 { 79 .min_uV = 1400000, 80 .max_uV = 2193750, 81 .uV_step = 6250, 82 }, 83 { 84 .min_uV = 1250000, 85 .max_uV = 2837500, 86 .uV_step = 12500, 87 }, 88 }; 89 90 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev) 91 { 92 struct pv88090_regulator *info = rdev_get_drvdata(rdev); 93 unsigned int data; 94 int ret, mode = 0; 95 96 ret = regmap_read(rdev->regmap, info->conf, &data); 97 if (ret < 0) 98 return ret; 99 100 switch (data & PV88090_BUCK1_MODE_MASK) { 101 case PV88090_BUCK_MODE_SYNC: 102 mode = REGULATOR_MODE_FAST; 103 break; 104 case PV88090_BUCK_MODE_AUTO: 105 mode = REGULATOR_MODE_NORMAL; 106 break; 107 case PV88090_BUCK_MODE_SLEEP: 108 mode = REGULATOR_MODE_STANDBY; 109 break; 110 } 111 112 return mode; 113 } 114 115 static int pv88090_buck_set_mode(struct regulator_dev *rdev, 116 unsigned int mode) 117 { 118 struct pv88090_regulator *info = rdev_get_drvdata(rdev); 119 int val = 0; 120 121 switch (mode) { 122 case REGULATOR_MODE_FAST: 123 val = PV88090_BUCK_MODE_SYNC; 124 break; 125 case REGULATOR_MODE_NORMAL: 126 val = PV88090_BUCK_MODE_AUTO; 127 break; 128 case REGULATOR_MODE_STANDBY: 129 val = PV88090_BUCK_MODE_SLEEP; 130 break; 131 default: 132 return -EINVAL; 133 } 134 135 return regmap_update_bits(rdev->regmap, info->conf, 136 PV88090_BUCK1_MODE_MASK, val); 137 } 138 139 static const struct regulator_ops pv88090_buck_ops = { 140 .get_mode = pv88090_buck_get_mode, 141 .set_mode = pv88090_buck_set_mode, 142 .enable = regulator_enable_regmap, 143 .disable = regulator_disable_regmap, 144 .is_enabled = regulator_is_enabled_regmap, 145 .set_voltage_sel = regulator_set_voltage_sel_regmap, 146 .get_voltage_sel = regulator_get_voltage_sel_regmap, 147 .list_voltage = regulator_list_voltage_linear, 148 .set_current_limit = regulator_set_current_limit_regmap, 149 .get_current_limit = regulator_get_current_limit_regmap, 150 }; 151 152 static const struct regulator_ops pv88090_ldo_ops = { 153 .enable = regulator_enable_regmap, 154 .disable = regulator_disable_regmap, 155 .is_enabled = regulator_is_enabled_regmap, 156 .set_voltage_sel = regulator_set_voltage_sel_regmap, 157 .get_voltage_sel = regulator_get_voltage_sel_regmap, 158 .list_voltage = regulator_list_voltage_linear, 159 }; 160 161 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \ 162 {\ 163 .desc = {\ 164 .id = chip##_ID_##regl_name,\ 165 .name = __stringify(chip##_##regl_name),\ 166 .of_match = of_match_ptr(#regl_name),\ 167 .regulators_node = of_match_ptr("regulators"),\ 168 .type = REGULATOR_VOLTAGE,\ 169 .owner = THIS_MODULE,\ 170 .ops = &pv88090_buck_ops,\ 171 .min_uV = min, \ 172 .uV_step = step, \ 173 .n_voltages = ((max) - (min))/(step) + 1, \ 174 .enable_reg = PV88090_REG_##regl_name##_CONF0, \ 175 .enable_mask = PV88090_##regl_name##_EN, \ 176 .vsel_reg = PV88090_REG_##regl_name##_CONF0, \ 177 .vsel_mask = PV88090_V##regl_name##_MASK, \ 178 .curr_table = limits_array, \ 179 .n_current_limits = ARRAY_SIZE(limits_array), \ 180 .csel_reg = PV88090_REG_##regl_name##_CONF1, \ 181 .csel_mask = PV88090_##regl_name##_ILIM_MASK, \ 182 },\ 183 .conf = PV88090_REG_##regl_name##_CONF1, \ 184 .conf2 = PV88090_REG_##regl_name##_CONF2, \ 185 } 186 187 #define PV88090_LDO(chip, regl_name, min, step, max) \ 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 = &pv88090_ldo_ops,\ 197 .min_uV = min, \ 198 .uV_step = step, \ 199 .n_voltages = ((max) - (min))/(step) + 1, \ 200 .enable_reg = PV88090_REG_##regl_name##_CONT, \ 201 .enable_mask = PV88090_##regl_name##_EN, \ 202 .vsel_reg = PV88090_REG_##regl_name##_CONT, \ 203 .vsel_mask = PV88090_V##regl_name##_MASK, \ 204 },\ 205 } 206 207 static struct pv88090_regulator pv88090_regulator_info[] = { 208 PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750, 209 pv88090_buck1_limits), 210 PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750, 211 pv88090_buck23_limits), 212 PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750, 213 pv88090_buck23_limits), 214 PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000), 215 PV88090_LDO(PV88090, LDO2, 650000, 25000, 2225000), 216 }; 217 218 static irqreturn_t pv88090_irq_handler(int irq, void *data) 219 { 220 struct pv88090 *chip = data; 221 int i, reg_val, err, ret = IRQ_NONE; 222 223 err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, ®_val); 224 if (err < 0) 225 goto error_i2c; 226 227 if (reg_val & PV88090_E_VDD_FLT) { 228 for (i = 0; i < PV88090_MAX_REGULATORS; i++) { 229 if (chip->rdev[i] != NULL) { 230 regulator_lock(chip->rdev[i]); 231 regulator_notifier_call_chain(chip->rdev[i], 232 REGULATOR_EVENT_UNDER_VOLTAGE, 233 NULL); 234 regulator_unlock(chip->rdev[i]); 235 } 236 } 237 238 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A, 239 PV88090_E_VDD_FLT); 240 if (err < 0) 241 goto error_i2c; 242 243 ret = IRQ_HANDLED; 244 } 245 246 if (reg_val & PV88090_E_OVER_TEMP) { 247 for (i = 0; i < PV88090_MAX_REGULATORS; i++) { 248 if (chip->rdev[i] != NULL) { 249 regulator_lock(chip->rdev[i]); 250 regulator_notifier_call_chain(chip->rdev[i], 251 REGULATOR_EVENT_OVER_TEMP, 252 NULL); 253 regulator_unlock(chip->rdev[i]); 254 } 255 } 256 257 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A, 258 PV88090_E_OVER_TEMP); 259 if (err < 0) 260 goto error_i2c; 261 262 ret = IRQ_HANDLED; 263 } 264 265 return ret; 266 267 error_i2c: 268 dev_err(chip->dev, "I2C error : %d\n", err); 269 return IRQ_NONE; 270 } 271 272 /* 273 * I2C driver interface functions 274 */ 275 static int pv88090_i2c_probe(struct i2c_client *i2c) 276 { 277 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev); 278 struct pv88090 *chip; 279 struct regulator_config config = { }; 280 int error, i, ret = 0; 281 unsigned int conf2, range, index; 282 283 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL); 284 if (!chip) 285 return -ENOMEM; 286 287 chip->dev = &i2c->dev; 288 chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config); 289 if (IS_ERR(chip->regmap)) { 290 error = PTR_ERR(chip->regmap); 291 dev_err(chip->dev, "Failed to allocate register map: %d\n", 292 error); 293 return error; 294 } 295 296 i2c_set_clientdata(i2c, chip); 297 298 if (i2c->irq != 0) { 299 ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF); 300 if (ret < 0) { 301 dev_err(chip->dev, 302 "Failed to mask A reg: %d\n", ret); 303 return ret; 304 } 305 306 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF); 307 if (ret < 0) { 308 dev_err(chip->dev, 309 "Failed to mask B reg: %d\n", ret); 310 return ret; 311 } 312 313 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, 314 pv88090_irq_handler, 315 IRQF_TRIGGER_LOW|IRQF_ONESHOT, 316 "pv88090", chip); 317 if (ret != 0) { 318 dev_err(chip->dev, "Failed to request IRQ: %d\n", 319 i2c->irq); 320 return ret; 321 } 322 323 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A, 324 PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0); 325 if (ret < 0) { 326 dev_err(chip->dev, 327 "Failed to update mask reg: %d\n", ret); 328 return ret; 329 } 330 331 } else { 332 dev_warn(chip->dev, "No IRQ configured\n"); 333 } 334 335 config.dev = chip->dev; 336 config.regmap = chip->regmap; 337 338 for (i = 0; i < PV88090_MAX_REGULATORS; i++) { 339 if (init_data) 340 config.init_data = &init_data[i]; 341 342 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) { 343 ret = regmap_read(chip->regmap, 344 pv88090_regulator_info[i].conf2, &conf2); 345 if (ret < 0) 346 return ret; 347 348 conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) & 349 PV88090_BUCK_VDAC_RANGE_MASK; 350 351 ret = regmap_read(chip->regmap, 352 PV88090_REG_BUCK_FOLD_RANGE, &range); 353 if (ret < 0) 354 return ret; 355 356 range = (range >> 357 (PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) & 358 PV88090_BUCK_VRANGE_GAIN_MASK; 359 index = ((range << 1) | conf2); 360 if (index > PV88090_ID_BUCK3) { 361 dev_err(chip->dev, 362 "Invalid index(%d)\n", index); 363 return -EINVAL; 364 } 365 366 pv88090_regulator_info[i].desc.min_uV 367 = pv88090_buck_vol[index].min_uV; 368 pv88090_regulator_info[i].desc.uV_step 369 = pv88090_buck_vol[index].uV_step; 370 pv88090_regulator_info[i].desc.n_voltages 371 = ((pv88090_buck_vol[index].max_uV) 372 - (pv88090_buck_vol[index].min_uV)) 373 /(pv88090_buck_vol[index].uV_step) + 1; 374 } 375 376 config.driver_data = (void *)&pv88090_regulator_info[i]; 377 chip->rdev[i] = devm_regulator_register(chip->dev, 378 &pv88090_regulator_info[i].desc, &config); 379 if (IS_ERR(chip->rdev[i])) { 380 dev_err(chip->dev, 381 "Failed to register PV88090 regulator\n"); 382 return PTR_ERR(chip->rdev[i]); 383 } 384 } 385 386 return 0; 387 } 388 389 static const struct i2c_device_id pv88090_i2c_id[] = { 390 {"pv88090", 0}, 391 {}, 392 }; 393 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id); 394 395 #ifdef CONFIG_OF 396 static const struct of_device_id pv88090_dt_ids[] = { 397 { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] }, 398 {}, 399 }; 400 MODULE_DEVICE_TABLE(of, pv88090_dt_ids); 401 #endif 402 403 static struct i2c_driver pv88090_regulator_driver = { 404 .driver = { 405 .name = "pv88090", 406 .of_match_table = of_match_ptr(pv88090_dt_ids), 407 }, 408 .probe_new = pv88090_i2c_probe, 409 .id_table = pv88090_i2c_id, 410 }; 411 412 module_i2c_driver(pv88090_regulator_driver); 413 414 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); 415 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090"); 416 MODULE_LICENSE("GPL"); 417