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_notifier_call_chain(chip->rdev[i], 231 REGULATOR_EVENT_UNDER_VOLTAGE, 232 NULL); 233 } 234 235 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A, 236 PV88090_E_VDD_FLT); 237 if (err < 0) 238 goto error_i2c; 239 240 ret = IRQ_HANDLED; 241 } 242 243 if (reg_val & PV88090_E_OVER_TEMP) { 244 for (i = 0; i < PV88090_MAX_REGULATORS; i++) { 245 if (chip->rdev[i] != NULL) 246 regulator_notifier_call_chain(chip->rdev[i], 247 REGULATOR_EVENT_OVER_TEMP, 248 NULL); 249 } 250 251 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A, 252 PV88090_E_OVER_TEMP); 253 if (err < 0) 254 goto error_i2c; 255 256 ret = IRQ_HANDLED; 257 } 258 259 return ret; 260 261 error_i2c: 262 dev_err(chip->dev, "I2C error : %d\n", err); 263 return IRQ_NONE; 264 } 265 266 /* 267 * I2C driver interface functions 268 */ 269 static int pv88090_i2c_probe(struct i2c_client *i2c) 270 { 271 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev); 272 struct pv88090 *chip; 273 struct regulator_config config = { }; 274 int error, i, ret = 0; 275 unsigned int conf2, range, index; 276 277 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL); 278 if (!chip) 279 return -ENOMEM; 280 281 chip->dev = &i2c->dev; 282 chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config); 283 if (IS_ERR(chip->regmap)) { 284 error = PTR_ERR(chip->regmap); 285 dev_err(chip->dev, "Failed to allocate register map: %d\n", 286 error); 287 return error; 288 } 289 290 i2c_set_clientdata(i2c, chip); 291 292 if (i2c->irq != 0) { 293 ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF); 294 if (ret < 0) { 295 dev_err(chip->dev, 296 "Failed to mask A reg: %d\n", ret); 297 return ret; 298 } 299 300 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF); 301 if (ret < 0) { 302 dev_err(chip->dev, 303 "Failed to mask B reg: %d\n", ret); 304 return ret; 305 } 306 307 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, 308 pv88090_irq_handler, 309 IRQF_TRIGGER_LOW|IRQF_ONESHOT, 310 "pv88090", chip); 311 if (ret != 0) { 312 dev_err(chip->dev, "Failed to request IRQ: %d\n", 313 i2c->irq); 314 return ret; 315 } 316 317 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A, 318 PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0); 319 if (ret < 0) { 320 dev_err(chip->dev, 321 "Failed to update mask reg: %d\n", ret); 322 return ret; 323 } 324 325 } else { 326 dev_warn(chip->dev, "No IRQ configured\n"); 327 } 328 329 config.dev = chip->dev; 330 config.regmap = chip->regmap; 331 332 for (i = 0; i < PV88090_MAX_REGULATORS; i++) { 333 if (init_data) 334 config.init_data = &init_data[i]; 335 336 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) { 337 ret = regmap_read(chip->regmap, 338 pv88090_regulator_info[i].conf2, &conf2); 339 if (ret < 0) 340 return ret; 341 342 conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) & 343 PV88090_BUCK_VDAC_RANGE_MASK; 344 345 ret = regmap_read(chip->regmap, 346 PV88090_REG_BUCK_FOLD_RANGE, &range); 347 if (ret < 0) 348 return ret; 349 350 range = (range >> 351 (PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) & 352 PV88090_BUCK_VRANGE_GAIN_MASK; 353 index = ((range << 1) | conf2); 354 if (index > PV88090_ID_BUCK3) { 355 dev_err(chip->dev, 356 "Invalid index(%d)\n", index); 357 return -EINVAL; 358 } 359 360 pv88090_regulator_info[i].desc.min_uV 361 = pv88090_buck_vol[index].min_uV; 362 pv88090_regulator_info[i].desc.uV_step 363 = pv88090_buck_vol[index].uV_step; 364 pv88090_regulator_info[i].desc.n_voltages 365 = ((pv88090_buck_vol[index].max_uV) 366 - (pv88090_buck_vol[index].min_uV)) 367 /(pv88090_buck_vol[index].uV_step) + 1; 368 } 369 370 config.driver_data = (void *)&pv88090_regulator_info[i]; 371 chip->rdev[i] = devm_regulator_register(chip->dev, 372 &pv88090_regulator_info[i].desc, &config); 373 if (IS_ERR(chip->rdev[i])) { 374 dev_err(chip->dev, 375 "Failed to register PV88090 regulator\n"); 376 return PTR_ERR(chip->rdev[i]); 377 } 378 } 379 380 return 0; 381 } 382 383 static const struct i2c_device_id pv88090_i2c_id[] = { 384 { "pv88090" }, 385 {} 386 }; 387 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id); 388 389 #ifdef CONFIG_OF 390 static const struct of_device_id pv88090_dt_ids[] = { 391 { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] }, 392 {}, 393 }; 394 MODULE_DEVICE_TABLE(of, pv88090_dt_ids); 395 #endif 396 397 static struct i2c_driver pv88090_regulator_driver = { 398 .driver = { 399 .name = "pv88090", 400 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 401 .of_match_table = of_match_ptr(pv88090_dt_ids), 402 }, 403 .probe = pv88090_i2c_probe, 404 .id_table = pv88090_i2c_id, 405 }; 406 407 module_i2c_driver(pv88090_regulator_driver); 408 409 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); 410 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090"); 411 MODULE_LICENSE("GPL"); 412