drivers/mfd/sec-core.c

   1 /*
   2  * sec-core.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd
   5  *              http://www.samsung.com
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/err.h>
  18 #include <linux/slab.h>
  19 #include <linux/i2c.h>
  20 #include <linux/of.h>
  21 #include <linux/of_irq.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/mutex.h>
  25 #include <linux/mfd/core.h>
  26 #include <linux/mfd/samsung/core.h>
  27 #include <linux/mfd/samsung/irq.h>
  28 #include <linux/mfd/samsung/rtc.h>
  29 #include <linux/mfd/samsung/s2mpa01.h>
  30 #include <linux/mfd/samsung/s2mps11.h>
  31 #include <linux/mfd/samsung/s2mps14.h>
  32 #include <linux/mfd/samsung/s5m8763.h>
  33 #include <linux/mfd/samsung/s5m8767.h>
  34 #include <linux/regmap.h>
  35
  36 static const struct mfd_cell s5m8751_devs[] = {
  37         {
  38                 .name = "s5m8751-pmic",
  39         }, {
  40                 .name = "s5m-charger",
  41         }, {
  42                 .name = "s5m8751-codec",
  43         },
  44 };
  45
  46 static const struct mfd_cell s5m8763_devs[] = {
  47         {
  48                 .name = "s5m8763-pmic",
  49         }, {
  50                 .name = "s5m-rtc",
  51         }, {
  52                 .name = "s5m-charger",
  53         },
  54 };
  55
  56 static const struct mfd_cell s5m8767_devs[] = {
  57         {
  58                 .name = "s5m8767-pmic",
  59         }, {
  60                 .name = "s5m-rtc",
  61         }, {
  62                 .name = "s5m8767-clk",
  63                 .of_compatible = "samsung,s5m8767-clk",
  64         }
  65 };
  66
  67 static const struct mfd_cell s2mps11_devs[] = {
  68         {
  69                 .name = "s2mps11-pmic",
  70         }, {
  71                 .name = "s2mps11-clk",
  72                 .of_compatible = "samsung,s2mps11-clk",
  73         }
  74 };
  75
  76 static const struct mfd_cell s2mps14_devs[] = {
  77         {
  78                 .name = "s2mps14-pmic",
  79         }, {
  80                 .name = "s2mps14-rtc",
  81         }, {
  82                 .name = "s2mps14-clk",
  83                 .of_compatible = "samsung,s2mps14-clk",
  84         }
  85 };
  86
  87 static const struct mfd_cell s2mpa01_devs[] = {
  88         {
  89                 .name = "s2mpa01-pmic",
  90         },
  91 };
  92
  93 #ifdef CONFIG_OF
  94 static struct of_device_id sec_dt_match[] = {
  95         {       .compatible = "samsung,s5m8767-pmic",
  96                 .data = (void *)S5M8767X,
  97         }, {
  98                 .compatible = "samsung,s2mps11-pmic",
  99                 .data = (void *)S2MPS11X,
 100         }, {
 101                 .compatible = "samsung,s2mps14-pmic",
 102                 .data = (void *)S2MPS14X,
 103         }, {
 104                 .compatible = "samsung,s2mpa01-pmic",
 105                 .data = (void *)S2MPA01,
 106         }, {
 107                 /* Sentinel */
 108         },
 109 };
 110 #endif
 111
 112 static bool s2mpa01_volatile(struct device *dev, unsigned int reg)
 113 {
 114         switch (reg) {
 115         case S2MPA01_REG_INT1M:
 116         case S2MPA01_REG_INT2M:
 117         case S2MPA01_REG_INT3M:
 118                 return false;
 119         default:
 120                 return true;
 121         }
 122 }
 123
 124 static bool s2mps11_volatile(struct device *dev, unsigned int reg)
 125 {
 126         switch (reg) {
 127         case S2MPS11_REG_INT1M:
 128         case S2MPS11_REG_INT2M:
 129         case S2MPS11_REG_INT3M:
 130                 return false;
 131         default:
 132                 return true;
 133         }
 134 }
 135
 136 static bool s5m8763_volatile(struct device *dev, unsigned int reg)
 137 {
 138         switch (reg) {
 139         case S5M8763_REG_IRQM1:
 140         case S5M8763_REG_IRQM2:
 141         case S5M8763_REG_IRQM3:
 142         case S5M8763_REG_IRQM4:
 143                 return false;
 144         default:
 145                 return true;
 146         }
 147 }
 148
 149 static const struct regmap_config sec_regmap_config = {
 150         .reg_bits = 8,
 151         .val_bits = 8,
 152 };
 153
 154 static const struct regmap_config s2mpa01_regmap_config = {
 155         .reg_bits = 8,
 156         .val_bits = 8,
 157
 158         .max_register = S2MPA01_REG_LDO_OVCB4,
 159         .volatile_reg = s2mpa01_volatile,
 160         .cache_type = REGCACHE_FLAT,
 161 };
 162
 163 static const struct regmap_config s2mps11_regmap_config = {
 164         .reg_bits = 8,
 165         .val_bits = 8,
 166
 167         .max_register = S2MPS11_REG_L38CTRL,
 168         .volatile_reg = s2mps11_volatile,
 169         .cache_type = REGCACHE_FLAT,
 170 };
 171
 172 static const struct regmap_config s2mps14_regmap_config = {
 173         .reg_bits = 8,
 174         .val_bits = 8,
 175
 176         .max_register = S2MPS14_REG_LDODSCH3,
 177         .volatile_reg = s2mps11_volatile,
 178         .cache_type = REGCACHE_FLAT,
 179 };
 180
 181 static const struct regmap_config s5m8763_regmap_config = {
 182         .reg_bits = 8,
 183         .val_bits = 8,
 184
 185         .max_register = S5M8763_REG_LBCNFG2,
 186         .volatile_reg = s5m8763_volatile,
 187         .cache_type = REGCACHE_FLAT,
 188 };
 189
 190 static const struct regmap_config s5m8767_regmap_config = {
 191         .reg_bits = 8,
 192         .val_bits = 8,
 193
 194         .max_register = S5M8767_REG_LDO28CTRL,
 195         .volatile_reg = s2mps11_volatile,
 196         .cache_type = REGCACHE_FLAT,
 197 };
 198
 199 static const struct regmap_config s5m_rtc_regmap_config = {
 200         .reg_bits = 8,
 201         .val_bits = 8,
 202
 203         .max_register = SEC_RTC_REG_MAX,
 204 };
 205
 206 static const struct regmap_config s2mps14_rtc_regmap_config = {
 207         .reg_bits = 8,
 208         .val_bits = 8,
 209
 210         .max_register = S2MPS_RTC_REG_MAX,
 211 };
 212
 213 #ifdef CONFIG_OF
 214 /*
 215  * Only the common platform data elements for s5m8767 are parsed here from the
 216  * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
 217  * others have to parse their own platform data elements from device tree.
 218  *
 219  * The s5m8767 platform data structure is instantiated here and the drivers for
 220  * the sub-modules need not instantiate another instance while parsing their
 221  * platform data.
 222  */
 223 static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 224                                         struct device *dev)
 225 {
 226         struct sec_platform_data *pd;
 227
 228         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 229         if (!pd) {
 230                 dev_err(dev, "could not allocate memory for pdata\n");
 231                 return ERR_PTR(-ENOMEM);
 232         }
 233
 234         /*
 235          * ToDo: the 'wakeup' member in the platform data is more of a linux
 236          * specfic information. Hence, there is no binding for that yet and
 237          * not parsed here.
 238          */
 239
 240         return pd;
 241 }
 242 #else
 243 static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 244                                         struct device *dev)
 245 {
 246         return NULL;
 247 }
 248 #endif
 249
 250 static inline unsigned long sec_i2c_get_driver_data(struct i2c_client *i2c,
 251                                                 const struct i2c_device_id *id)
 252 {
 253 #ifdef CONFIG_OF
 254         if (i2c->dev.of_node) {
 255                 const struct of_device_id *match;
 256                 match = of_match_node(sec_dt_match, i2c->dev.of_node);
 257                 return (unsigned long)match->data;
 258         }
 259 #endif
 260         return id->driver_data;
 261 }
 262
 263 static int sec_pmic_probe(struct i2c_client *i2c,
 264                             const struct i2c_device_id *id)
 265 {
 266         struct sec_platform_data *pdata = dev_get_platdata(&i2c->dev);
 267         const struct regmap_config *regmap, *regmap_rtc;
 268         struct sec_pmic_dev *sec_pmic;
 269         int ret;
 270
 271         sec_pmic = devm_kzalloc(&i2c->dev, sizeof(struct sec_pmic_dev),
 272                                 GFP_KERNEL);
 273         if (sec_pmic == NULL)
 274                 return -ENOMEM;
 275
 276         i2c_set_clientdata(i2c, sec_pmic);
 277         sec_pmic->dev = &i2c->dev;
 278         sec_pmic->i2c = i2c;
 279         sec_pmic->irq = i2c->irq;
 280         sec_pmic->type = sec_i2c_get_driver_data(i2c, id);
 281
 282         if (sec_pmic->dev->of_node) {
 283                 pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
 284                 if (IS_ERR(pdata)) {
 285                         ret = PTR_ERR(pdata);
 286                         return ret;
 287                 }
 288                 pdata->device_type = sec_pmic->type;
 289         }
 290         if (pdata) {
 291                 sec_pmic->device_type = pdata->device_type;
 292                 sec_pmic->ono = pdata->ono;
 293                 sec_pmic->irq_base = pdata->irq_base;
 294                 sec_pmic->wakeup = pdata->wakeup;
 295                 sec_pmic->pdata = pdata;
 296         }
 297
 298         switch (sec_pmic->device_type) {
 299         case S2MPA01:
 300                 regmap = &s2mpa01_regmap_config;
 301                 break;
 302         case S2MPS11X:
 303                 regmap = &s2mps11_regmap_config;
 304                 /*
 305                  * The rtc-s5m driver does not support S2MPS11 and there
 306                  * is no mfd_cell for S2MPS11 RTC device.
 307                  * However we must pass something to devm_regmap_init_i2c()
 308                  * so use S5M-like regmap config even though it wouldn't work.
 309                  */
 310                 regmap_rtc = &s5m_rtc_regmap_config;
 311                 break;
 312         case S2MPS14X:
 313                 regmap = &s2mps14_regmap_config;
 314                 regmap_rtc = &s2mps14_rtc_regmap_config;
 315                 break;
 316         case S5M8763X:
 317                 regmap = &s5m8763_regmap_config;
 318                 regmap_rtc = &s5m_rtc_regmap_config;
 319                 break;
 320         case S5M8767X:
 321                 regmap = &s5m8767_regmap_config;
 322                 regmap_rtc = &s5m_rtc_regmap_config;
 323                 break;
 324         default:
 325                 regmap = &sec_regmap_config;
 326                 regmap_rtc = &s5m_rtc_regmap_config;
 327                 break;
 328         }
 329
 330         sec_pmic->regmap_pmic = devm_regmap_init_i2c(i2c, regmap);
 331         if (IS_ERR(sec_pmic->regmap_pmic)) {
 332                 ret = PTR_ERR(sec_pmic->regmap_pmic);
 333                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 334                         ret);
 335                 return ret;
 336         }
 337
 338         sec_pmic->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
 339         if (!sec_pmic->rtc) {
 340                 dev_err(&i2c->dev, "Failed to allocate I2C for RTC\n");
 341                 return -ENODEV;
 342         }
 343         i2c_set_clientdata(sec_pmic->rtc, sec_pmic);
 344
 345         sec_pmic->regmap_rtc = devm_regmap_init_i2c(sec_pmic->rtc, regmap_rtc);
 346         if (IS_ERR(sec_pmic->regmap_rtc)) {
 347                 ret = PTR_ERR(sec_pmic->regmap_rtc);
 348                 dev_err(&i2c->dev, "Failed to allocate RTC register map: %d\n",
 349                         ret);
 350                 goto err_regmap_rtc;
 351         }
 352
 353         if (pdata && pdata->cfg_pmic_irq)
 354                 pdata->cfg_pmic_irq();
 355
 356         sec_irq_init(sec_pmic);
 357
 358         pm_runtime_set_active(sec_pmic->dev);
 359
 360         switch (sec_pmic->device_type) {
 361         case S5M8751X:
 362                 ret = mfd_add_devices(sec_pmic->dev, -1, s5m8751_devs,
 363                                       ARRAY_SIZE(s5m8751_devs), NULL, 0, NULL);
 364                 break;
 365         case S5M8763X:
 366                 ret = mfd_add_devices(sec_pmic->dev, -1, s5m8763_devs,
 367                                       ARRAY_SIZE(s5m8763_devs), NULL, 0, NULL);
 368                 break;
 369         case S5M8767X:
 370                 ret = mfd_add_devices(sec_pmic->dev, -1, s5m8767_devs,
 371                                       ARRAY_SIZE(s5m8767_devs), NULL, 0, NULL);
 372                 break;
 373         case S2MPA01:
 374                 ret = mfd_add_devices(sec_pmic->dev, -1, s2mpa01_devs,
 375                                       ARRAY_SIZE(s2mpa01_devs), NULL, 0, NULL);
 376                 break;
 377         case S2MPS11X:
 378                 ret = mfd_add_devices(sec_pmic->dev, -1, s2mps11_devs,
 379                                       ARRAY_SIZE(s2mps11_devs), NULL, 0, NULL);
 380                 break;
 381         case S2MPS14X:
 382                 ret = mfd_add_devices(sec_pmic->dev, -1, s2mps14_devs,
 383                                       ARRAY_SIZE(s2mps14_devs), NULL, 0, NULL);
 384                 break;
 385         default:
 386                 /* If this happens the probe function is problem */
 387                 BUG();
 388         }
 389
 390         if (ret)
 391                 goto err_mfd;
 392
 393         device_init_wakeup(sec_pmic->dev, sec_pmic->wakeup);
 394
 395         return ret;
 396
 397 err_mfd:
 398         sec_irq_exit(sec_pmic);
 399 err_regmap_rtc:
 400         i2c_unregister_device(sec_pmic->rtc);
 401         return ret;
 402 }
 403
 404 static int sec_pmic_remove(struct i2c_client *i2c)
 405 {
 406         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 407
 408         mfd_remove_devices(sec_pmic->dev);
 409         sec_irq_exit(sec_pmic);
 410         i2c_unregister_device(sec_pmic->rtc);
 411         return 0;
 412 }
 413
 414 #ifdef CONFIG_PM_SLEEP
 415 static int sec_pmic_suspend(struct device *dev)
 416 {
 417         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 418         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 419
 420         if (device_may_wakeup(dev)) {
 421                 enable_irq_wake(sec_pmic->irq);
 422                 /*
 423                  * PMIC IRQ must be disabled during suspend for RTC alarm
 424                  * to work properly.
 425                  * When device is woken up from suspend by RTC Alarm, an
 426                  * interrupt occurs before resuming I2C bus controller.
 427                  * The interrupt is handled by regmap_irq_thread which tries
 428                  * to read RTC registers. This read fails (I2C is still
 429                  * suspended) and RTC Alarm interrupt is disabled.
 430                  */
 431                 disable_irq(sec_pmic->irq);
 432         }
 433
 434         return 0;
 435 }
 436
 437 static int sec_pmic_resume(struct device *dev)
 438 {
 439         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 440         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 441
 442         if (device_may_wakeup(dev)) {
 443                 disable_irq_wake(sec_pmic->irq);
 444                 enable_irq(sec_pmic->irq);
 445         }
 446
 447         return 0;
 448 }
 449 #endif /* CONFIG_PM_SLEEP */
 450
 451 static SIMPLE_DEV_PM_OPS(sec_pmic_pm_ops, sec_pmic_suspend, sec_pmic_resume);
 452
 453 static const struct i2c_device_id sec_pmic_id[] = {
 454         { "sec_pmic", 0 },
 455         { }
 456 };
 457 MODULE_DEVICE_TABLE(i2c, sec_pmic_id);
 458
 459 static struct i2c_driver sec_pmic_driver = {
 460         .driver = {
 461                    .name = "sec_pmic",
 462                    .owner = THIS_MODULE,
 463                    .pm = &sec_pmic_pm_ops,
 464                    .of_match_table = of_match_ptr(sec_dt_match),
 465         },
 466         .probe = sec_pmic_probe,
 467         .remove = sec_pmic_remove,
 468         .id_table = sec_pmic_id,
 469 };
 470
 471 static int __init sec_pmic_init(void)
 472 {
 473         return i2c_add_driver(&sec_pmic_driver);
 474 }
 475
 476 subsys_initcall(sec_pmic_init);
 477
 478 static void __exit sec_pmic_exit(void)
 479 {
 480         i2c_del_driver(&sec_pmic_driver);
 481 }
 482 module_exit(sec_pmic_exit);
 483
 484 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 485 MODULE_DESCRIPTION("Core support for the S5M MFD");
 486 MODULE_LICENSE("GPL");