1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * LP8755 High Performance Power Management Unit : System Interface Driver 4 * (based on rev. 0.26) 5 * Copyright 2012 Texas Instruments 6 * 7 * Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/slab.h> 12 #include <linux/i2c.h> 13 #include <linux/err.h> 14 #include <linux/irq.h> 15 #include <linux/interrupt.h> 16 #include <linux/gpio.h> 17 #include <linux/regmap.h> 18 #include <linux/uaccess.h> 19 #include <linux/regulator/driver.h> 20 #include <linux/regulator/machine.h> 21 #include <linux/platform_data/lp8755.h> 22 23 #define LP8755_REG_BUCK0 0x00 24 #define LP8755_REG_BUCK1 0x03 25 #define LP8755_REG_BUCK2 0x04 26 #define LP8755_REG_BUCK3 0x01 27 #define LP8755_REG_BUCK4 0x05 28 #define LP8755_REG_BUCK5 0x02 29 #define LP8755_REG_MAX 0xFF 30 31 #define LP8755_BUCK_EN_M BIT(7) 32 #define LP8755_BUCK_LINEAR_OUT_MAX 0x76 33 #define LP8755_BUCK_VOUT_M 0x7F 34 35 struct lp8755_mphase { 36 int nreg; 37 int buck_num[LP8755_BUCK_MAX]; 38 }; 39 40 struct lp8755_chip { 41 struct device *dev; 42 struct regmap *regmap; 43 struct lp8755_platform_data *pdata; 44 45 int irq; 46 unsigned int irqmask; 47 48 int mphase; 49 struct regulator_dev *rdev[LP8755_BUCK_MAX]; 50 }; 51 52 static int lp8755_buck_enable_time(struct regulator_dev *rdev) 53 { 54 int ret; 55 unsigned int regval; 56 enum lp8755_bucks id = rdev_get_id(rdev); 57 58 ret = regmap_read(rdev->regmap, 0x12 + id, ®val); 59 if (ret < 0) { 60 dev_err(&rdev->dev, "i2c access error %s\n", __func__); 61 return ret; 62 } 63 return (regval & 0xff) * 100; 64 } 65 66 static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode) 67 { 68 int ret; 69 unsigned int regbval = 0x0; 70 enum lp8755_bucks id = rdev_get_id(rdev); 71 struct lp8755_chip *pchip = rdev_get_drvdata(rdev); 72 73 switch (mode) { 74 case REGULATOR_MODE_FAST: 75 /* forced pwm mode */ 76 regbval = (0x01 << id); 77 break; 78 case REGULATOR_MODE_NORMAL: 79 /* enable automatic pwm/pfm mode */ 80 ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x00); 81 if (ret < 0) 82 goto err_i2c; 83 break; 84 case REGULATOR_MODE_IDLE: 85 /* enable automatic pwm/pfm/lppfm mode */ 86 ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x20); 87 if (ret < 0) 88 goto err_i2c; 89 90 ret = regmap_update_bits(rdev->regmap, 0x10, 0x01, 0x01); 91 if (ret < 0) 92 goto err_i2c; 93 break; 94 default: 95 dev_err(pchip->dev, "Not supported buck mode %s\n", __func__); 96 /* forced pwm mode */ 97 regbval = (0x01 << id); 98 } 99 100 ret = regmap_update_bits(rdev->regmap, 0x06, 0x01 << id, regbval); 101 if (ret < 0) 102 goto err_i2c; 103 return ret; 104 err_i2c: 105 dev_err(&rdev->dev, "i2c access error %s\n", __func__); 106 return ret; 107 } 108 109 static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev) 110 { 111 int ret; 112 unsigned int regval; 113 enum lp8755_bucks id = rdev_get_id(rdev); 114 115 ret = regmap_read(rdev->regmap, 0x06, ®val); 116 if (ret < 0) 117 goto err_i2c; 118 119 /* mode fast means forced pwm mode */ 120 if (regval & (0x01 << id)) 121 return REGULATOR_MODE_FAST; 122 123 ret = regmap_read(rdev->regmap, 0x08 + id, ®val); 124 if (ret < 0) 125 goto err_i2c; 126 127 /* mode idle means automatic pwm/pfm/lppfm mode */ 128 if (regval & 0x20) 129 return REGULATOR_MODE_IDLE; 130 131 /* mode normal means automatic pwm/pfm mode */ 132 return REGULATOR_MODE_NORMAL; 133 134 err_i2c: 135 dev_err(&rdev->dev, "i2c access error %s\n", __func__); 136 return 0; 137 } 138 139 static const unsigned int lp8755_buck_ramp_table[] = { 140 30000, 15000, 7500, 3800, 1900, 940, 470, 230 141 }; 142 143 static const struct regulator_ops lp8755_buck_ops = { 144 .map_voltage = regulator_map_voltage_linear, 145 .list_voltage = regulator_list_voltage_linear, 146 .set_voltage_sel = regulator_set_voltage_sel_regmap, 147 .get_voltage_sel = regulator_get_voltage_sel_regmap, 148 .enable = regulator_enable_regmap, 149 .disable = regulator_disable_regmap, 150 .is_enabled = regulator_is_enabled_regmap, 151 .enable_time = lp8755_buck_enable_time, 152 .set_mode = lp8755_buck_set_mode, 153 .get_mode = lp8755_buck_get_mode, 154 .set_ramp_delay = regulator_set_ramp_delay_regmap, 155 }; 156 157 #define lp8755_rail(_id) "lp8755_buck"#_id 158 #define lp8755_buck_init(_id)\ 159 {\ 160 .constraints = {\ 161 .name = lp8755_rail(_id),\ 162 .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\ 163 .min_uV = 500000,\ 164 .max_uV = 1675000,\ 165 },\ 166 } 167 168 static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = { 169 [LP8755_BUCK0] = lp8755_buck_init(0), 170 [LP8755_BUCK1] = lp8755_buck_init(1), 171 [LP8755_BUCK2] = lp8755_buck_init(2), 172 [LP8755_BUCK3] = lp8755_buck_init(3), 173 [LP8755_BUCK4] = lp8755_buck_init(4), 174 [LP8755_BUCK5] = lp8755_buck_init(5), 175 }; 176 177 static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = { 178 { 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } }, 179 { 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3, 180 LP8755_BUCK4, LP8755_BUCK5 } }, 181 { 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4, 182 LP8755_BUCK5} }, 183 { 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} }, 184 { 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} }, 185 { 2, { LP8755_BUCK0, LP8755_BUCK5} }, 186 { 1, { LP8755_BUCK0} }, 187 { 2, { LP8755_BUCK0, LP8755_BUCK3} }, 188 { 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} }, 189 }; 190 191 static int lp8755_init_data(struct lp8755_chip *pchip) 192 { 193 unsigned int regval; 194 int ret, icnt, buck_num; 195 struct lp8755_platform_data *pdata = pchip->pdata; 196 197 /* read back muti-phase configuration */ 198 ret = regmap_read(pchip->regmap, 0x3D, ®val); 199 if (ret < 0) 200 goto out_i2c_error; 201 pchip->mphase = regval & 0x0F; 202 203 /* set default data based on multi-phase config */ 204 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) { 205 buck_num = mphase_buck[pchip->mphase].buck_num[icnt]; 206 pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num]; 207 } 208 return ret; 209 210 out_i2c_error: 211 dev_err(pchip->dev, "i2c access error %s\n", __func__); 212 return ret; 213 } 214 215 #define lp8755_buck_desc(_id)\ 216 {\ 217 .name = lp8755_rail(_id),\ 218 .id = LP8755_BUCK##_id,\ 219 .ops = &lp8755_buck_ops,\ 220 .n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\ 221 .uV_step = 10000,\ 222 .min_uV = 500000,\ 223 .type = REGULATOR_VOLTAGE,\ 224 .owner = THIS_MODULE,\ 225 .enable_reg = LP8755_REG_BUCK##_id,\ 226 .enable_mask = LP8755_BUCK_EN_M,\ 227 .vsel_reg = LP8755_REG_BUCK##_id,\ 228 .vsel_mask = LP8755_BUCK_VOUT_M,\ 229 .ramp_reg = (LP8755_BUCK##_id) + 0x7,\ 230 .ramp_mask = 0x7,\ 231 .ramp_delay_table = lp8755_buck_ramp_table,\ 232 .n_ramp_values = ARRAY_SIZE(lp8755_buck_ramp_table),\ 233 } 234 235 static const struct regulator_desc lp8755_regulators[] = { 236 lp8755_buck_desc(0), 237 lp8755_buck_desc(1), 238 lp8755_buck_desc(2), 239 lp8755_buck_desc(3), 240 lp8755_buck_desc(4), 241 lp8755_buck_desc(5), 242 }; 243 244 static int lp8755_regulator_init(struct lp8755_chip *pchip) 245 { 246 int ret, icnt, buck_num; 247 struct lp8755_platform_data *pdata = pchip->pdata; 248 struct regulator_config rconfig = { }; 249 250 rconfig.regmap = pchip->regmap; 251 rconfig.dev = pchip->dev; 252 rconfig.driver_data = pchip; 253 254 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) { 255 buck_num = mphase_buck[pchip->mphase].buck_num[icnt]; 256 rconfig.init_data = pdata->buck_data[buck_num]; 257 rconfig.of_node = pchip->dev->of_node; 258 pchip->rdev[buck_num] = 259 devm_regulator_register(pchip->dev, 260 &lp8755_regulators[buck_num], &rconfig); 261 if (IS_ERR(pchip->rdev[buck_num])) { 262 ret = PTR_ERR(pchip->rdev[buck_num]); 263 pchip->rdev[buck_num] = NULL; 264 dev_err(pchip->dev, "regulator init failed: buck %d\n", 265 buck_num); 266 return ret; 267 } 268 } 269 270 return 0; 271 } 272 273 static irqreturn_t lp8755_irq_handler(int irq, void *data) 274 { 275 int ret, icnt; 276 unsigned int flag0, flag1; 277 struct lp8755_chip *pchip = data; 278 279 /* read flag0 register */ 280 ret = regmap_read(pchip->regmap, 0x0D, &flag0); 281 if (ret < 0) 282 goto err_i2c; 283 /* clear flag register to pull up int. pin */ 284 ret = regmap_write(pchip->regmap, 0x0D, 0x00); 285 if (ret < 0) 286 goto err_i2c; 287 288 /* sent power fault detection event to specific regulator */ 289 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) 290 if ((flag0 & (0x4 << icnt)) 291 && (pchip->irqmask & (0x04 << icnt)) 292 && (pchip->rdev[icnt] != NULL)) { 293 regulator_notifier_call_chain(pchip->rdev[icnt], 294 LP8755_EVENT_PWR_FAULT, 295 NULL); 296 } 297 298 /* read flag1 register */ 299 ret = regmap_read(pchip->regmap, 0x0E, &flag1); 300 if (ret < 0) 301 goto err_i2c; 302 /* clear flag register to pull up int. pin */ 303 ret = regmap_write(pchip->regmap, 0x0E, 0x00); 304 if (ret < 0) 305 goto err_i2c; 306 307 /* send OCP event to all regulator devices */ 308 if ((flag1 & 0x01) && (pchip->irqmask & 0x01)) 309 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) 310 if (pchip->rdev[icnt] != NULL) { 311 regulator_notifier_call_chain(pchip->rdev[icnt], 312 LP8755_EVENT_OCP, 313 NULL); 314 } 315 316 /* send OVP event to all regulator devices */ 317 if ((flag1 & 0x02) && (pchip->irqmask & 0x02)) 318 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) 319 if (pchip->rdev[icnt] != NULL) { 320 regulator_notifier_call_chain(pchip->rdev[icnt], 321 LP8755_EVENT_OVP, 322 NULL); 323 } 324 return IRQ_HANDLED; 325 326 err_i2c: 327 dev_err(pchip->dev, "i2c access error %s\n", __func__); 328 return IRQ_NONE; 329 } 330 331 static int lp8755_int_config(struct lp8755_chip *pchip) 332 { 333 int ret; 334 unsigned int regval; 335 336 if (pchip->irq == 0) { 337 dev_warn(pchip->dev, "not use interrupt : %s\n", __func__); 338 return 0; 339 } 340 341 ret = regmap_read(pchip->regmap, 0x0F, ®val); 342 if (ret < 0) { 343 dev_err(pchip->dev, "i2c access error %s\n", __func__); 344 return ret; 345 } 346 347 pchip->irqmask = regval; 348 return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL, 349 lp8755_irq_handler, 350 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 351 "lp8755-irq", pchip); 352 } 353 354 static const struct regmap_config lp8755_regmap = { 355 .reg_bits = 8, 356 .val_bits = 8, 357 .max_register = LP8755_REG_MAX, 358 }; 359 360 static int lp8755_probe(struct i2c_client *client, 361 const struct i2c_device_id *id) 362 { 363 int ret, icnt; 364 struct lp8755_chip *pchip; 365 struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev); 366 367 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 368 dev_err(&client->dev, "i2c functionality check fail.\n"); 369 return -EOPNOTSUPP; 370 } 371 372 pchip = devm_kzalloc(&client->dev, 373 sizeof(struct lp8755_chip), GFP_KERNEL); 374 if (!pchip) 375 return -ENOMEM; 376 377 pchip->dev = &client->dev; 378 pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap); 379 if (IS_ERR(pchip->regmap)) { 380 ret = PTR_ERR(pchip->regmap); 381 dev_err(&client->dev, "fail to allocate regmap %d\n", ret); 382 return ret; 383 } 384 i2c_set_clientdata(client, pchip); 385 386 if (pdata != NULL) { 387 pchip->pdata = pdata; 388 pchip->mphase = pdata->mphase; 389 } else { 390 pchip->pdata = devm_kzalloc(pchip->dev, 391 sizeof(struct lp8755_platform_data), 392 GFP_KERNEL); 393 if (!pchip->pdata) 394 return -ENOMEM; 395 ret = lp8755_init_data(pchip); 396 if (ret < 0) { 397 dev_err(&client->dev, "fail to initialize chip\n"); 398 return ret; 399 } 400 } 401 402 ret = lp8755_regulator_init(pchip); 403 if (ret < 0) { 404 dev_err(&client->dev, "fail to initialize regulators\n"); 405 goto err; 406 } 407 408 pchip->irq = client->irq; 409 ret = lp8755_int_config(pchip); 410 if (ret < 0) { 411 dev_err(&client->dev, "fail to irq config\n"); 412 goto err; 413 } 414 415 return ret; 416 417 err: 418 /* output disable */ 419 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) 420 regmap_write(pchip->regmap, icnt, 0x00); 421 422 return ret; 423 } 424 425 static void lp8755_remove(struct i2c_client *client) 426 { 427 int icnt; 428 struct lp8755_chip *pchip = i2c_get_clientdata(client); 429 430 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) 431 regmap_write(pchip->regmap, icnt, 0x00); 432 } 433 434 static const struct i2c_device_id lp8755_id[] = { 435 {LP8755_NAME, 0}, 436 {} 437 }; 438 439 MODULE_DEVICE_TABLE(i2c, lp8755_id); 440 441 static struct i2c_driver lp8755_i2c_driver = { 442 .driver = { 443 .name = LP8755_NAME, 444 }, 445 .probe = lp8755_probe, 446 .remove = lp8755_remove, 447 .id_table = lp8755_id, 448 }; 449 450 static int __init lp8755_init(void) 451 { 452 return i2c_add_driver(&lp8755_i2c_driver); 453 } 454 455 subsys_initcall(lp8755_init); 456 457 static void __exit lp8755_exit(void) 458 { 459 i2c_del_driver(&lp8755_i2c_driver); 460 } 461 462 module_exit(lp8755_exit); 463 464 MODULE_DESCRIPTION("Texas Instruments lp8755 driver"); 465 MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); 466 MODULE_LICENSE("GPL v2"); 467