drivers/mfd/max8997.c

   1 /*
   2  * max8997.c - mfd core driver for the Maxim 8966 and 8997
   3  *
   4  * Copyright (C) 2011 Samsung Electronics
   5  * MyungJoo Ham <myungjoo.ham@smasung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * This driver is based on max8998.c
  22  */
  23
  24 #include <linux/err.h>
  25 #include <linux/slab.h>
  26 #include <linux/i2c.h>
  27 #include <linux/of.h>
  28 #include <linux/of_irq.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/pm_runtime.h>
  31 #include <linux/module.h>
  32 #include <linux/mutex.h>
  33 #include <linux/mfd/core.h>
  34 #include <linux/mfd/max8997.h>
  35 #include <linux/mfd/max8997-private.h>
  36
  37 #define I2C_ADDR_PMIC   (0xCC >> 1)
  38 #define I2C_ADDR_MUIC   (0x4A >> 1)
  39 #define I2C_ADDR_BATTERY        (0x6C >> 1)
  40 #define I2C_ADDR_RTC    (0x0C >> 1)
  41 #define I2C_ADDR_HAPTIC (0x90 >> 1)
  42
  43 static const struct mfd_cell max8997_devs[] = {
  44         { .name = "max8997-pmic", },
  45         { .name = "max8997-rtc", },
  46         { .name = "max8997-battery", },
  47         { .name = "max8997-haptic", },
  48         { .name = "max8997-muic", },
  49         { .name = "max8997-led", .id = 1 },
  50         { .name = "max8997-led", .id = 2 },
  51 };
  52
  53 #ifdef CONFIG_OF
  54 static struct of_device_id max8997_pmic_dt_match[] = {
  55         { .compatible = "maxim,max8997-pmic", .data = (void *)TYPE_MAX8997 },
  56         {},
  57 };
  58 #endif
  59
  60 int max8997_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
  61 {
  62         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
  63         int ret;
  64
  65         mutex_lock(&max8997->iolock);
  66         ret = i2c_smbus_read_byte_data(i2c, reg);
  67         mutex_unlock(&max8997->iolock);
  68         if (ret < 0)
  69                 return ret;
  70
  71         ret &= 0xff;
  72         *dest = ret;
  73         return 0;
  74 }
  75 EXPORT_SYMBOL_GPL(max8997_read_reg);
  76
  77 int max8997_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  78 {
  79         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
  80         int ret;
  81
  82         mutex_lock(&max8997->iolock);
  83         ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
  84         mutex_unlock(&max8997->iolock);
  85         if (ret < 0)
  86                 return ret;
  87
  88         return 0;
  89 }
  90 EXPORT_SYMBOL_GPL(max8997_bulk_read);
  91
  92 int max8997_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
  93 {
  94         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
  95         int ret;
  96
  97         mutex_lock(&max8997->iolock);
  98         ret = i2c_smbus_write_byte_data(i2c, reg, value);
  99         mutex_unlock(&max8997->iolock);
 100         return ret;
 101 }
 102 EXPORT_SYMBOL_GPL(max8997_write_reg);
 103
 104 int max8997_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
 105 {
 106         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 107         int ret;
 108
 109         mutex_lock(&max8997->iolock);
 110         ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
 111         mutex_unlock(&max8997->iolock);
 112         if (ret < 0)
 113                 return ret;
 114
 115         return 0;
 116 }
 117 EXPORT_SYMBOL_GPL(max8997_bulk_write);
 118
 119 int max8997_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 120 {
 121         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 122         int ret;
 123
 124         mutex_lock(&max8997->iolock);
 125         ret = i2c_smbus_read_byte_data(i2c, reg);
 126         if (ret >= 0) {
 127                 u8 old_val = ret & 0xff;
 128                 u8 new_val = (val & mask) | (old_val & (~mask));
 129                 ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
 130         }
 131         mutex_unlock(&max8997->iolock);
 132         return ret;
 133 }
 134 EXPORT_SYMBOL_GPL(max8997_update_reg);
 135
 136 /*
 137  * Only the common platform data elements for max8997 are parsed here from the
 138  * device tree. Other sub-modules of max8997 such as pmic, rtc and others have
 139  * to parse their own platform data elements from device tree.
 140  *
 141  * The max8997 platform data structure is instantiated here and the drivers for
 142  * the sub-modules need not instantiate another instance while parsing their
 143  * platform data.
 144  */
 145 static struct max8997_platform_data *max8997_i2c_parse_dt_pdata(
 146                                         struct device *dev)
 147 {
 148         struct max8997_platform_data *pd;
 149
 150         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 151         if (!pd) {
 152                 dev_err(dev, "could not allocate memory for pdata\n");
 153                 return ERR_PTR(-ENOMEM);
 154         }
 155
 156         pd->ono = irq_of_parse_and_map(dev->of_node, 1);
 157
 158         /*
 159          * ToDo: the 'wakeup' member in the platform data is more of a linux
 160          * specfic information. Hence, there is no binding for that yet and
 161          * not parsed here.
 162          */
 163
 164         return pd;
 165 }
 166
 167 static inline int max8997_i2c_get_driver_data(struct i2c_client *i2c,
 168                                                 const struct i2c_device_id *id)
 169 {
 170         if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
 171                 const struct of_device_id *match;
 172                 match = of_match_node(max8997_pmic_dt_match, i2c->dev.of_node);
 173                 return (int)match->data;
 174         }
 175         return (int)id->driver_data;
 176 }
 177
 178 static int max8997_i2c_probe(struct i2c_client *i2c,
 179                             const struct i2c_device_id *id)
 180 {
 181         struct max8997_dev *max8997;
 182         struct max8997_platform_data *pdata = dev_get_platdata(&i2c->dev);
 183         int ret = 0;
 184
 185         max8997 = devm_kzalloc(&i2c->dev, sizeof(struct max8997_dev),
 186                                 GFP_KERNEL);
 187         if (max8997 == NULL)
 188                 return -ENOMEM;
 189
 190         i2c_set_clientdata(i2c, max8997);
 191         max8997->dev = &i2c->dev;
 192         max8997->i2c = i2c;
 193         max8997->type = max8997_i2c_get_driver_data(i2c, id);
 194         max8997->irq = i2c->irq;
 195
 196         if (IS_ENABLED(CONFIG_OF) && max8997->dev->of_node) {
 197                 pdata = max8997_i2c_parse_dt_pdata(max8997->dev);
 198                 if (IS_ERR(pdata))
 199                         return PTR_ERR(pdata);
 200         }
 201
 202         if (!pdata)
 203                 return ret;
 204
 205         max8997->pdata = pdata;
 206         max8997->ono = pdata->ono;
 207
 208         mutex_init(&max8997->iolock);
 209
 210         max8997->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
 211         i2c_set_clientdata(max8997->rtc, max8997);
 212         max8997->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
 213         i2c_set_clientdata(max8997->haptic, max8997);
 214         max8997->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
 215         i2c_set_clientdata(max8997->muic, max8997);
 216
 217         pm_runtime_set_active(max8997->dev);
 218
 219         max8997_irq_init(max8997);
 220
 221         ret = mfd_add_devices(max8997->dev, -1, max8997_devs,
 222                         ARRAY_SIZE(max8997_devs),
 223                         NULL, 0, NULL);
 224         if (ret < 0) {
 225                 dev_err(max8997->dev, "failed to add MFD devices %d\n", ret);
 226                 goto err_mfd;
 227         }
 228
 229         /*
 230          * TODO: enable others (flash, muic, rtc, battery, ...) and
 231          * check the return value
 232          */
 233
 234         /* MAX8997 has a power button input. */
 235         device_init_wakeup(max8997->dev, pdata->wakeup);
 236
 237         return ret;
 238
 239 err_mfd:
 240         mfd_remove_devices(max8997->dev);
 241         i2c_unregister_device(max8997->muic);
 242         i2c_unregister_device(max8997->haptic);
 243         i2c_unregister_device(max8997->rtc);
 244         return ret;
 245 }
 246
 247 static int max8997_i2c_remove(struct i2c_client *i2c)
 248 {
 249         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 250
 251         mfd_remove_devices(max8997->dev);
 252         i2c_unregister_device(max8997->muic);
 253         i2c_unregister_device(max8997->haptic);
 254         i2c_unregister_device(max8997->rtc);
 255
 256         return 0;
 257 }
 258
 259 static const struct i2c_device_id max8997_i2c_id[] = {
 260         { "max8997", TYPE_MAX8997 },
 261         { "max8966", TYPE_MAX8966 },
 262         { }
 263 };
 264 MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
 265
 266 static u8 max8997_dumpaddr_pmic[] = {
 267         MAX8997_REG_INT1MSK,
 268         MAX8997_REG_INT2MSK,
 269         MAX8997_REG_INT3MSK,
 270         MAX8997_REG_INT4MSK,
 271         MAX8997_REG_MAINCON1,
 272         MAX8997_REG_MAINCON2,
 273         MAX8997_REG_BUCKRAMP,
 274         MAX8997_REG_BUCK1CTRL,
 275         MAX8997_REG_BUCK1DVS1,
 276         MAX8997_REG_BUCK1DVS2,
 277         MAX8997_REG_BUCK1DVS3,
 278         MAX8997_REG_BUCK1DVS4,
 279         MAX8997_REG_BUCK1DVS5,
 280         MAX8997_REG_BUCK1DVS6,
 281         MAX8997_REG_BUCK1DVS7,
 282         MAX8997_REG_BUCK1DVS8,
 283         MAX8997_REG_BUCK2CTRL,
 284         MAX8997_REG_BUCK2DVS1,
 285         MAX8997_REG_BUCK2DVS2,
 286         MAX8997_REG_BUCK2DVS3,
 287         MAX8997_REG_BUCK2DVS4,
 288         MAX8997_REG_BUCK2DVS5,
 289         MAX8997_REG_BUCK2DVS6,
 290         MAX8997_REG_BUCK2DVS7,
 291         MAX8997_REG_BUCK2DVS8,
 292         MAX8997_REG_BUCK3CTRL,
 293         MAX8997_REG_BUCK3DVS,
 294         MAX8997_REG_BUCK4CTRL,
 295         MAX8997_REG_BUCK4DVS,
 296         MAX8997_REG_BUCK5CTRL,
 297         MAX8997_REG_BUCK5DVS1,
 298         MAX8997_REG_BUCK5DVS2,
 299         MAX8997_REG_BUCK5DVS3,
 300         MAX8997_REG_BUCK5DVS4,
 301         MAX8997_REG_BUCK5DVS5,
 302         MAX8997_REG_BUCK5DVS6,
 303         MAX8997_REG_BUCK5DVS7,
 304         MAX8997_REG_BUCK5DVS8,
 305         MAX8997_REG_BUCK6CTRL,
 306         MAX8997_REG_BUCK6BPSKIPCTRL,
 307         MAX8997_REG_BUCK7CTRL,
 308         MAX8997_REG_BUCK7DVS,
 309         MAX8997_REG_LDO1CTRL,
 310         MAX8997_REG_LDO2CTRL,
 311         MAX8997_REG_LDO3CTRL,
 312         MAX8997_REG_LDO4CTRL,
 313         MAX8997_REG_LDO5CTRL,
 314         MAX8997_REG_LDO6CTRL,
 315         MAX8997_REG_LDO7CTRL,
 316         MAX8997_REG_LDO8CTRL,
 317         MAX8997_REG_LDO9CTRL,
 318         MAX8997_REG_LDO10CTRL,
 319         MAX8997_REG_LDO11CTRL,
 320         MAX8997_REG_LDO12CTRL,
 321         MAX8997_REG_LDO13CTRL,
 322         MAX8997_REG_LDO14CTRL,
 323         MAX8997_REG_LDO15CTRL,
 324         MAX8997_REG_LDO16CTRL,
 325         MAX8997_REG_LDO17CTRL,
 326         MAX8997_REG_LDO18CTRL,
 327         MAX8997_REG_LDO21CTRL,
 328         MAX8997_REG_MBCCTRL1,
 329         MAX8997_REG_MBCCTRL2,
 330         MAX8997_REG_MBCCTRL3,
 331         MAX8997_REG_MBCCTRL4,
 332         MAX8997_REG_MBCCTRL5,
 333         MAX8997_REG_MBCCTRL6,
 334         MAX8997_REG_OTPCGHCVS,
 335         MAX8997_REG_SAFEOUTCTRL,
 336         MAX8997_REG_LBCNFG1,
 337         MAX8997_REG_LBCNFG2,
 338         MAX8997_REG_BBCCTRL,
 339
 340         MAX8997_REG_FLASH1_CUR,
 341         MAX8997_REG_FLASH2_CUR,
 342         MAX8997_REG_MOVIE_CUR,
 343         MAX8997_REG_GSMB_CUR,
 344         MAX8997_REG_BOOST_CNTL,
 345         MAX8997_REG_LEN_CNTL,
 346         MAX8997_REG_FLASH_CNTL,
 347         MAX8997_REG_WDT_CNTL,
 348         MAX8997_REG_MAXFLASH1,
 349         MAX8997_REG_MAXFLASH2,
 350         MAX8997_REG_FLASHSTATUSMASK,
 351
 352         MAX8997_REG_GPIOCNTL1,
 353         MAX8997_REG_GPIOCNTL2,
 354         MAX8997_REG_GPIOCNTL3,
 355         MAX8997_REG_GPIOCNTL4,
 356         MAX8997_REG_GPIOCNTL5,
 357         MAX8997_REG_GPIOCNTL6,
 358         MAX8997_REG_GPIOCNTL7,
 359         MAX8997_REG_GPIOCNTL8,
 360         MAX8997_REG_GPIOCNTL9,
 361         MAX8997_REG_GPIOCNTL10,
 362         MAX8997_REG_GPIOCNTL11,
 363         MAX8997_REG_GPIOCNTL12,
 364
 365         MAX8997_REG_LDO1CONFIG,
 366         MAX8997_REG_LDO2CONFIG,
 367         MAX8997_REG_LDO3CONFIG,
 368         MAX8997_REG_LDO4CONFIG,
 369         MAX8997_REG_LDO5CONFIG,
 370         MAX8997_REG_LDO6CONFIG,
 371         MAX8997_REG_LDO7CONFIG,
 372         MAX8997_REG_LDO8CONFIG,
 373         MAX8997_REG_LDO9CONFIG,
 374         MAX8997_REG_LDO10CONFIG,
 375         MAX8997_REG_LDO11CONFIG,
 376         MAX8997_REG_LDO12CONFIG,
 377         MAX8997_REG_LDO13CONFIG,
 378         MAX8997_REG_LDO14CONFIG,
 379         MAX8997_REG_LDO15CONFIG,
 380         MAX8997_REG_LDO16CONFIG,
 381         MAX8997_REG_LDO17CONFIG,
 382         MAX8997_REG_LDO18CONFIG,
 383         MAX8997_REG_LDO21CONFIG,
 384
 385         MAX8997_REG_DVSOKTIMER1,
 386         MAX8997_REG_DVSOKTIMER2,
 387         MAX8997_REG_DVSOKTIMER4,
 388         MAX8997_REG_DVSOKTIMER5,
 389 };
 390
 391 static u8 max8997_dumpaddr_muic[] = {
 392         MAX8997_MUIC_REG_INTMASK1,
 393         MAX8997_MUIC_REG_INTMASK2,
 394         MAX8997_MUIC_REG_INTMASK3,
 395         MAX8997_MUIC_REG_CDETCTRL,
 396         MAX8997_MUIC_REG_CONTROL1,
 397         MAX8997_MUIC_REG_CONTROL2,
 398         MAX8997_MUIC_REG_CONTROL3,
 399 };
 400
 401 static u8 max8997_dumpaddr_haptic[] = {
 402         MAX8997_HAPTIC_REG_CONF1,
 403         MAX8997_HAPTIC_REG_CONF2,
 404         MAX8997_HAPTIC_REG_DRVCONF,
 405         MAX8997_HAPTIC_REG_CYCLECONF1,
 406         MAX8997_HAPTIC_REG_CYCLECONF2,
 407         MAX8997_HAPTIC_REG_SIGCONF1,
 408         MAX8997_HAPTIC_REG_SIGCONF2,
 409         MAX8997_HAPTIC_REG_SIGCONF3,
 410         MAX8997_HAPTIC_REG_SIGCONF4,
 411         MAX8997_HAPTIC_REG_SIGDC1,
 412         MAX8997_HAPTIC_REG_SIGDC2,
 413         MAX8997_HAPTIC_REG_SIGPWMDC1,
 414         MAX8997_HAPTIC_REG_SIGPWMDC2,
 415         MAX8997_HAPTIC_REG_SIGPWMDC3,
 416         MAX8997_HAPTIC_REG_SIGPWMDC4,
 417 };
 418
 419 static int max8997_freeze(struct device *dev)
 420 {
 421         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 422         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 423         int i;
 424
 425         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++)
 426                 max8997_read_reg(i2c, max8997_dumpaddr_pmic[i],
 427                                 &max8997->reg_dump[i]);
 428
 429         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++)
 430                 max8997_read_reg(i2c, max8997_dumpaddr_muic[i],
 431                                 &max8997->reg_dump[i + MAX8997_REG_PMIC_END]);
 432
 433         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++)
 434                 max8997_read_reg(i2c, max8997_dumpaddr_haptic[i],
 435                                 &max8997->reg_dump[i + MAX8997_REG_PMIC_END +
 436                                 MAX8997_MUIC_REG_END]);
 437
 438         return 0;
 439 }
 440
 441 static int max8997_restore(struct device *dev)
 442 {
 443         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 444         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 445         int i;
 446
 447         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++)
 448                 max8997_write_reg(i2c, max8997_dumpaddr_pmic[i],
 449                                 max8997->reg_dump[i]);
 450
 451         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++)
 452                 max8997_write_reg(i2c, max8997_dumpaddr_muic[i],
 453                                 max8997->reg_dump[i + MAX8997_REG_PMIC_END]);
 454
 455         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++)
 456                 max8997_write_reg(i2c, max8997_dumpaddr_haptic[i],
 457                                 max8997->reg_dump[i + MAX8997_REG_PMIC_END +
 458                                 MAX8997_MUIC_REG_END]);
 459
 460         return 0;
 461 }
 462
 463 static int max8997_suspend(struct device *dev)
 464 {
 465         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 466         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 467
 468         if (device_may_wakeup(dev))
 469                 irq_set_irq_wake(max8997->irq, 1);
 470         return 0;
 471 }
 472
 473 static int max8997_resume(struct device *dev)
 474 {
 475         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 476         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 477
 478         if (device_may_wakeup(dev))
 479                 irq_set_irq_wake(max8997->irq, 0);
 480         return max8997_irq_resume(max8997);
 481 }
 482
 483 static const struct dev_pm_ops max8997_pm = {
 484         .suspend = max8997_suspend,
 485         .resume = max8997_resume,
 486         .freeze = max8997_freeze,
 487         .restore = max8997_restore,
 488 };
 489
 490 static struct i2c_driver max8997_i2c_driver = {
 491         .driver = {
 492                    .name = "max8997",
 493                    .owner = THIS_MODULE,
 494                    .pm = &max8997_pm,
 495                    .of_match_table = of_match_ptr(max8997_pmic_dt_match),
 496         },
 497         .probe = max8997_i2c_probe,
 498         .remove = max8997_i2c_remove,
 499         .id_table = max8997_i2c_id,
 500 };
 501
 502 static int __init max8997_i2c_init(void)
 503 {
 504         return i2c_add_driver(&max8997_i2c_driver);
 505 }
 506 /* init early so consumer devices can complete system boot */
 507 subsys_initcall(max8997_i2c_init);
 508
 509 static void __exit max8997_i2c_exit(void)
 510 {
 511         i2c_del_driver(&max8997_i2c_driver);
 512 }
 513 module_exit(max8997_i2c_exit);
 514
 515 MODULE_DESCRIPTION("MAXIM 8997 multi-function core driver");
 516 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 517 MODULE_LICENSE("GPL");