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