drivers/regulator/lp8755.c

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