drivers/mfd/max8997.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // max8997.c - mfd core driver for the Maxim 8966 and 8997
   4 //
   5 // Copyright (C) 2011 Samsung Electronics
   6 // MyungJoo Ham <myungjoo.ham@samsung.com>
   7 //
   8 // This driver is based on max8998.c
   9
  10 #include <linux/err.h>
  11 #include <linux/slab.h>
  12 #include <linux/i2c.h>
  13 #include <linux/of.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/init.h>
  18 #include <linux/mutex.h>
  19 #include <linux/mfd/core.h>
  20 #include <linux/mfd/max8997.h>
  21 #include <linux/mfd/max8997-private.h>
  22
  23 #define I2C_ADDR_PMIC   (0xCC >> 1)
  24 #define I2C_ADDR_MUIC   (0x4A >> 1)
  25 #define I2C_ADDR_BATTERY        (0x6C >> 1)
  26 #define I2C_ADDR_RTC    (0x0C >> 1)
  27 #define I2C_ADDR_HAPTIC (0x90 >> 1)
  28
  29 static const struct mfd_cell max8997_devs[] = {
  30         { .name = "max8997-pmic", },
  31         { .name = "max8997-rtc", },
  32         { .name = "max8997-battery", },
  33         { .name = "max8997-haptic", },
  34         { .name = "max8997-muic", },
  35         { .name = "max8997-led", .id = 1 },
  36         { .name = "max8997-led", .id = 2 },
  37 };
  38
  39 #ifdef CONFIG_OF
  40 static const struct of_device_id max8997_pmic_dt_match[] = {
  41         { .compatible = "maxim,max8997-pmic", .data = (void *)TYPE_MAX8997 },
  42         {},
  43 };
  44 #endif
  45
  46 int max8997_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
  47 {
  48         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
  49         int ret;
  50
  51         mutex_lock(&max8997->iolock);
  52         ret = i2c_smbus_read_byte_data(i2c, reg);
  53         mutex_unlock(&max8997->iolock);
  54         if (ret < 0)
  55                 return ret;
  56
  57         ret &= 0xff;
  58         *dest = ret;
  59         return 0;
  60 }
  61 EXPORT_SYMBOL_GPL(max8997_read_reg);
  62
  63 int max8997_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  64 {
  65         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
  66         int ret;
  67
  68         mutex_lock(&max8997->iolock);
  69         ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
  70         mutex_unlock(&max8997->iolock);
  71         if (ret < 0)
  72                 return ret;
  73
  74         return 0;
  75 }
  76 EXPORT_SYMBOL_GPL(max8997_bulk_read);
  77
  78 int max8997_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
  79 {
  80         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
  81         int ret;
  82
  83         mutex_lock(&max8997->iolock);
  84         ret = i2c_smbus_write_byte_data(i2c, reg, value);
  85         mutex_unlock(&max8997->iolock);
  86         return ret;
  87 }
  88 EXPORT_SYMBOL_GPL(max8997_write_reg);
  89
  90 int max8997_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  91 {
  92         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
  93         int ret;
  94
  95         mutex_lock(&max8997->iolock);
  96         ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
  97         mutex_unlock(&max8997->iolock);
  98         if (ret < 0)
  99                 return ret;
 100
 101         return 0;
 102 }
 103 EXPORT_SYMBOL_GPL(max8997_bulk_write);
 104
 105 int max8997_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 106 {
 107         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 108         int ret;
 109
 110         mutex_lock(&max8997->iolock);
 111         ret = i2c_smbus_read_byte_data(i2c, reg);
 112         if (ret >= 0) {
 113                 u8 old_val = ret & 0xff;
 114                 u8 new_val = (val & mask) | (old_val & (~mask));
 115                 ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
 116         }
 117         mutex_unlock(&max8997->iolock);
 118         return ret;
 119 }
 120 EXPORT_SYMBOL_GPL(max8997_update_reg);
 121
 122 /*
 123  * Only the common platform data elements for max8997 are parsed here from the
 124  * device tree. Other sub-modules of max8997 such as pmic, rtc and others have
 125  * to parse their own platform data elements from device tree.
 126  *
 127  * The max8997 platform data structure is instantiated here and the drivers for
 128  * the sub-modules need not instantiate another instance while parsing their
 129  * platform data.
 130  */
 131 static struct max8997_platform_data *max8997_i2c_parse_dt_pdata(
 132                                         struct device *dev)
 133 {
 134         struct max8997_platform_data *pd;
 135
 136         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 137         if (!pd)
 138                 return ERR_PTR(-ENOMEM);
 139
 140         pd->ono = irq_of_parse_and_map(dev->of_node, 1);
 141
 142         return pd;
 143 }
 144
 145 static inline unsigned long max8997_i2c_get_driver_data(struct i2c_client *i2c,
 146                                                 const struct i2c_device_id *id)
 147 {
 148         if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
 149                 const struct of_device_id *match;
 150                 match = of_match_node(max8997_pmic_dt_match, i2c->dev.of_node);
 151                 return (unsigned long)match->data;
 152         }
 153         return id->driver_data;
 154 }
 155
 156 static int max8997_i2c_probe(struct i2c_client *i2c,
 157                             const struct i2c_device_id *id)
 158 {
 159         struct max8997_dev *max8997;
 160         struct max8997_platform_data *pdata = dev_get_platdata(&i2c->dev);
 161         int ret = 0;
 162
 163         max8997 = devm_kzalloc(&i2c->dev, sizeof(struct max8997_dev),
 164                                 GFP_KERNEL);
 165         if (max8997 == NULL)
 166                 return -ENOMEM;
 167
 168         i2c_set_clientdata(i2c, max8997);
 169         max8997->dev = &i2c->dev;
 170         max8997->i2c = i2c;
 171         max8997->type = max8997_i2c_get_driver_data(i2c, id);
 172         max8997->irq = i2c->irq;
 173
 174         if (IS_ENABLED(CONFIG_OF) && max8997->dev->of_node) {
 175                 pdata = max8997_i2c_parse_dt_pdata(max8997->dev);
 176                 if (IS_ERR(pdata))
 177                         return PTR_ERR(pdata);
 178         }
 179
 180         if (!pdata)
 181                 return ret;
 182
 183         max8997->pdata = pdata;
 184         max8997->ono = pdata->ono;
 185
 186         mutex_init(&max8997->iolock);
 187
 188         max8997->rtc = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_RTC);
 189         if (IS_ERR(max8997->rtc)) {
 190                 dev_err(max8997->dev, "Failed to allocate I2C device for RTC\n");
 191                 return PTR_ERR(max8997->rtc);
 192         }
 193         i2c_set_clientdata(max8997->rtc, max8997);
 194
 195         max8997->haptic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_HAPTIC);
 196         if (IS_ERR(max8997->haptic)) {
 197                 dev_err(max8997->dev, "Failed to allocate I2C device for Haptic\n");
 198                 ret = PTR_ERR(max8997->haptic);
 199                 goto err_i2c_haptic;
 200         }
 201         i2c_set_clientdata(max8997->haptic, max8997);
 202
 203         max8997->muic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_MUIC);
 204         if (IS_ERR(max8997->muic)) {
 205                 dev_err(max8997->dev, "Failed to allocate I2C device for MUIC\n");
 206                 ret = PTR_ERR(max8997->muic);
 207                 goto err_i2c_muic;
 208         }
 209         i2c_set_clientdata(max8997->muic, max8997);
 210
 211         pm_runtime_set_active(max8997->dev);
 212
 213         max8997_irq_init(max8997);
 214
 215         ret = mfd_add_devices(max8997->dev, -1, max8997_devs,
 216                         ARRAY_SIZE(max8997_devs),
 217                         NULL, 0, NULL);
 218         if (ret < 0) {
 219                 dev_err(max8997->dev, "failed to add MFD devices %d\n", ret);
 220                 goto err_mfd;
 221         }
 222
 223         /*
 224          * TODO: enable others (flash, muic, rtc, battery, ...) and
 225          * check the return value
 226          */
 227
 228         /* MAX8997 has a power button input. */
 229         device_init_wakeup(max8997->dev, true);
 230
 231         return ret;
 232
 233 err_mfd:
 234         mfd_remove_devices(max8997->dev);
 235         i2c_unregister_device(max8997->muic);
 236 err_i2c_muic:
 237         i2c_unregister_device(max8997->haptic);
 238 err_i2c_haptic:
 239         i2c_unregister_device(max8997->rtc);
 240         return ret;
 241 }
 242
 243 static const struct i2c_device_id max8997_i2c_id[] = {
 244         { "max8997", TYPE_MAX8997 },
 245         { "max8966", TYPE_MAX8966 },
 246         { }
 247 };
 248
 249 static u8 max8997_dumpaddr_pmic[] = {
 250         MAX8997_REG_INT1MSK,
 251         MAX8997_REG_INT2MSK,
 252         MAX8997_REG_INT3MSK,
 253         MAX8997_REG_INT4MSK,
 254         MAX8997_REG_MAINCON1,
 255         MAX8997_REG_MAINCON2,
 256         MAX8997_REG_BUCKRAMP,
 257         MAX8997_REG_BUCK1CTRL,
 258         MAX8997_REG_BUCK1DVS1,
 259         MAX8997_REG_BUCK1DVS2,
 260         MAX8997_REG_BUCK1DVS3,
 261         MAX8997_REG_BUCK1DVS4,
 262         MAX8997_REG_BUCK1DVS5,
 263         MAX8997_REG_BUCK1DVS6,
 264         MAX8997_REG_BUCK1DVS7,
 265         MAX8997_REG_BUCK1DVS8,
 266         MAX8997_REG_BUCK2CTRL,
 267         MAX8997_REG_BUCK2DVS1,
 268         MAX8997_REG_BUCK2DVS2,
 269         MAX8997_REG_BUCK2DVS3,
 270         MAX8997_REG_BUCK2DVS4,
 271         MAX8997_REG_BUCK2DVS5,
 272         MAX8997_REG_BUCK2DVS6,
 273         MAX8997_REG_BUCK2DVS7,
 274         MAX8997_REG_BUCK2DVS8,
 275         MAX8997_REG_BUCK3CTRL,
 276         MAX8997_REG_BUCK3DVS,
 277         MAX8997_REG_BUCK4CTRL,
 278         MAX8997_REG_BUCK4DVS,
 279         MAX8997_REG_BUCK5CTRL,
 280         MAX8997_REG_BUCK5DVS1,
 281         MAX8997_REG_BUCK5DVS2,
 282         MAX8997_REG_BUCK5DVS3,
 283         MAX8997_REG_BUCK5DVS4,
 284         MAX8997_REG_BUCK5DVS5,
 285         MAX8997_REG_BUCK5DVS6,
 286         MAX8997_REG_BUCK5DVS7,
 287         MAX8997_REG_BUCK5DVS8,
 288         MAX8997_REG_BUCK6CTRL,
 289         MAX8997_REG_BUCK6BPSKIPCTRL,
 290         MAX8997_REG_BUCK7CTRL,
 291         MAX8997_REG_BUCK7DVS,
 292         MAX8997_REG_LDO1CTRL,
 293         MAX8997_REG_LDO2CTRL,
 294         MAX8997_REG_LDO3CTRL,
 295         MAX8997_REG_LDO4CTRL,
 296         MAX8997_REG_LDO5CTRL,
 297         MAX8997_REG_LDO6CTRL,
 298         MAX8997_REG_LDO7CTRL,
 299         MAX8997_REG_LDO8CTRL,
 300         MAX8997_REG_LDO9CTRL,
 301         MAX8997_REG_LDO10CTRL,
 302         MAX8997_REG_LDO11CTRL,
 303         MAX8997_REG_LDO12CTRL,
 304         MAX8997_REG_LDO13CTRL,
 305         MAX8997_REG_LDO14CTRL,
 306         MAX8997_REG_LDO15CTRL,
 307         MAX8997_REG_LDO16CTRL,
 308         MAX8997_REG_LDO17CTRL,
 309         MAX8997_REG_LDO18CTRL,
 310         MAX8997_REG_LDO21CTRL,
 311         MAX8997_REG_MBCCTRL1,
 312         MAX8997_REG_MBCCTRL2,
 313         MAX8997_REG_MBCCTRL3,
 314         MAX8997_REG_MBCCTRL4,
 315         MAX8997_REG_MBCCTRL5,
 316         MAX8997_REG_MBCCTRL6,
 317         MAX8997_REG_OTPCGHCVS,
 318         MAX8997_REG_SAFEOUTCTRL,
 319         MAX8997_REG_LBCNFG1,
 320         MAX8997_REG_LBCNFG2,
 321         MAX8997_REG_BBCCTRL,
 322
 323         MAX8997_REG_FLASH1_CUR,
 324         MAX8997_REG_FLASH2_CUR,
 325         MAX8997_REG_MOVIE_CUR,
 326         MAX8997_REG_GSMB_CUR,
 327         MAX8997_REG_BOOST_CNTL,
 328         MAX8997_REG_LEN_CNTL,
 329         MAX8997_REG_FLASH_CNTL,
 330         MAX8997_REG_WDT_CNTL,
 331         MAX8997_REG_MAXFLASH1,
 332         MAX8997_REG_MAXFLASH2,
 333         MAX8997_REG_FLASHSTATUSMASK,
 334
 335         MAX8997_REG_GPIOCNTL1,
 336         MAX8997_REG_GPIOCNTL2,
 337         MAX8997_REG_GPIOCNTL3,
 338         MAX8997_REG_GPIOCNTL4,
 339         MAX8997_REG_GPIOCNTL5,
 340         MAX8997_REG_GPIOCNTL6,
 341         MAX8997_REG_GPIOCNTL7,
 342         MAX8997_REG_GPIOCNTL8,
 343         MAX8997_REG_GPIOCNTL9,
 344         MAX8997_REG_GPIOCNTL10,
 345         MAX8997_REG_GPIOCNTL11,
 346         MAX8997_REG_GPIOCNTL12,
 347
 348         MAX8997_REG_LDO1CONFIG,
 349         MAX8997_REG_LDO2CONFIG,
 350         MAX8997_REG_LDO3CONFIG,
 351         MAX8997_REG_LDO4CONFIG,
 352         MAX8997_REG_LDO5CONFIG,
 353         MAX8997_REG_LDO6CONFIG,
 354         MAX8997_REG_LDO7CONFIG,
 355         MAX8997_REG_LDO8CONFIG,
 356         MAX8997_REG_LDO9CONFIG,
 357         MAX8997_REG_LDO10CONFIG,
 358         MAX8997_REG_LDO11CONFIG,
 359         MAX8997_REG_LDO12CONFIG,
 360         MAX8997_REG_LDO13CONFIG,
 361         MAX8997_REG_LDO14CONFIG,
 362         MAX8997_REG_LDO15CONFIG,
 363         MAX8997_REG_LDO16CONFIG,
 364         MAX8997_REG_LDO17CONFIG,
 365         MAX8997_REG_LDO18CONFIG,
 366         MAX8997_REG_LDO21CONFIG,
 367
 368         MAX8997_REG_DVSOKTIMER1,
 369         MAX8997_REG_DVSOKTIMER2,
 370         MAX8997_REG_DVSOKTIMER4,
 371         MAX8997_REG_DVSOKTIMER5,
 372 };
 373
 374 static u8 max8997_dumpaddr_muic[] = {
 375         MAX8997_MUIC_REG_INTMASK1,
 376         MAX8997_MUIC_REG_INTMASK2,
 377         MAX8997_MUIC_REG_INTMASK3,
 378         MAX8997_MUIC_REG_CDETCTRL,
 379         MAX8997_MUIC_REG_CONTROL1,
 380         MAX8997_MUIC_REG_CONTROL2,
 381         MAX8997_MUIC_REG_CONTROL3,
 382 };
 383
 384 static u8 max8997_dumpaddr_haptic[] = {
 385         MAX8997_HAPTIC_REG_CONF1,
 386         MAX8997_HAPTIC_REG_CONF2,
 387         MAX8997_HAPTIC_REG_DRVCONF,
 388         MAX8997_HAPTIC_REG_CYCLECONF1,
 389         MAX8997_HAPTIC_REG_CYCLECONF2,
 390         MAX8997_HAPTIC_REG_SIGCONF1,
 391         MAX8997_HAPTIC_REG_SIGCONF2,
 392         MAX8997_HAPTIC_REG_SIGCONF3,
 393         MAX8997_HAPTIC_REG_SIGCONF4,
 394         MAX8997_HAPTIC_REG_SIGDC1,
 395         MAX8997_HAPTIC_REG_SIGDC2,
 396         MAX8997_HAPTIC_REG_SIGPWMDC1,
 397         MAX8997_HAPTIC_REG_SIGPWMDC2,
 398         MAX8997_HAPTIC_REG_SIGPWMDC3,
 399         MAX8997_HAPTIC_REG_SIGPWMDC4,
 400 };
 401
 402 static int max8997_freeze(struct device *dev)
 403 {
 404         struct i2c_client *i2c = to_i2c_client(dev);
 405         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 406         int i;
 407
 408         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++)
 409                 max8997_read_reg(i2c, max8997_dumpaddr_pmic[i],
 410                                 &max8997->reg_dump[i]);
 411
 412         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++)
 413                 max8997_read_reg(i2c, max8997_dumpaddr_muic[i],
 414                                 &max8997->reg_dump[i + MAX8997_REG_PMIC_END]);
 415
 416         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++)
 417                 max8997_read_reg(i2c, max8997_dumpaddr_haptic[i],
 418                                 &max8997->reg_dump[i + MAX8997_REG_PMIC_END +
 419                                 MAX8997_MUIC_REG_END]);
 420
 421         return 0;
 422 }
 423
 424 static int max8997_restore(struct device *dev)
 425 {
 426         struct i2c_client *i2c = to_i2c_client(dev);
 427         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 428         int i;
 429
 430         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++)
 431                 max8997_write_reg(i2c, max8997_dumpaddr_pmic[i],
 432                                 max8997->reg_dump[i]);
 433
 434         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++)
 435                 max8997_write_reg(i2c, max8997_dumpaddr_muic[i],
 436                                 max8997->reg_dump[i + MAX8997_REG_PMIC_END]);
 437
 438         for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++)
 439                 max8997_write_reg(i2c, max8997_dumpaddr_haptic[i],
 440                                 max8997->reg_dump[i + MAX8997_REG_PMIC_END +
 441                                 MAX8997_MUIC_REG_END]);
 442
 443         return 0;
 444 }
 445
 446 static int max8997_suspend(struct device *dev)
 447 {
 448         struct i2c_client *i2c = to_i2c_client(dev);
 449         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 450
 451         disable_irq(max8997->irq);
 452         if (device_may_wakeup(dev))
 453                 irq_set_irq_wake(max8997->irq, 1);
 454         return 0;
 455 }
 456
 457 static int max8997_resume(struct device *dev)
 458 {
 459         struct i2c_client *i2c = to_i2c_client(dev);
 460         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 461
 462         if (device_may_wakeup(dev))
 463                 irq_set_irq_wake(max8997->irq, 0);
 464         enable_irq(max8997->irq);
 465         return max8997_irq_resume(max8997);
 466 }
 467
 468 static const struct dev_pm_ops max8997_pm = {
 469         .suspend = max8997_suspend,
 470         .resume = max8997_resume,
 471         .freeze = max8997_freeze,
 472         .restore = max8997_restore,
 473 };
 474
 475 static struct i2c_driver max8997_i2c_driver = {
 476         .driver = {
 477                    .name = "max8997",
 478                    .pm = &max8997_pm,
 479                    .suppress_bind_attrs = true,
 480                    .of_match_table = of_match_ptr(max8997_pmic_dt_match),
 481         },
 482         .probe = max8997_i2c_probe,
 483         .id_table = max8997_i2c_id,
 484 };
 485
 486 static int __init max8997_i2c_init(void)
 487 {
 488         return i2c_add_driver(&max8997_i2c_driver);
 489 }
 490 /* init early so consumer devices can complete system boot */
 491 subsys_initcall(max8997_i2c_init);