drivers/mfd/max14577.c

   1 /*
   2  * max14577.c - mfd core driver for the Maxim 14577/77836
   3  *
   4  * Copyright (C) 2014 Samsung Electrnoics
   5  * Chanwoo Choi <cw00.choi@samsung.com>
   6  * Krzysztof Kozlowski <k.kozlowski@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * This driver is based on max8997.c
  19  */
  20
  21 #include <linux/err.h>
  22 #include <linux/module.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/of_device.h>
  25 #include <linux/mfd/core.h>
  26 #include <linux/mfd/max14577.h>
  27 #include <linux/mfd/max14577-private.h>
  28
  29 static const struct mfd_cell max14577_devs[] = {
  30         {
  31                 .name = "max14577-muic",
  32                 .of_compatible = "maxim,max14577-muic",
  33         },
  34         {
  35                 .name = "max14577-regulator",
  36                 .of_compatible = "maxim,max14577-regulator",
  37         },
  38         { .name = "max14577-charger", },
  39 };
  40
  41 static const struct mfd_cell max77836_devs[] = {
  42         {
  43                 .name = "max77836-muic",
  44                 .of_compatible = "maxim,max77836-muic",
  45         },
  46         {
  47                 .name = "max77836-regulator",
  48                 .of_compatible = "maxim,max77836-regulator",
  49         },
  50         {
  51                 .name = "max77836-charger",
  52                 .of_compatible = "maxim,max77836-charger",
  53         },
  54         {
  55                 .name = "max77836-battery",
  56                 .of_compatible = "maxim,max77836-battery",
  57         },
  58 };
  59
  60 static const struct of_device_id max14577_dt_match[] = {
  61         {
  62                 .compatible = "maxim,max14577",
  63                 .data = (void *)MAXIM_DEVICE_TYPE_MAX14577,
  64         },
  65         {
  66                 .compatible = "maxim,max77836",
  67                 .data = (void *)MAXIM_DEVICE_TYPE_MAX77836,
  68         },
  69         {},
  70 };
  71
  72 static bool max14577_muic_volatile_reg(struct device *dev, unsigned int reg)
  73 {
  74         switch (reg) {
  75         case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
  76                 return true;
  77         default:
  78                 break;
  79         }
  80         return false;
  81 }
  82
  83 static bool max77836_muic_volatile_reg(struct device *dev, unsigned int reg)
  84 {
  85         /* Any max14577 volatile registers are also max77836 volatile. */
  86         if (max14577_muic_volatile_reg(dev, reg))
  87                 return true;
  88
  89         switch (reg) {
  90         case MAX77836_FG_REG_VCELL_MSB ... MAX77836_FG_REG_SOC_LSB:
  91         case MAX77836_FG_REG_CRATE_MSB ... MAX77836_FG_REG_CRATE_LSB:
  92         case MAX77836_FG_REG_STATUS_H ... MAX77836_FG_REG_STATUS_L:
  93         case MAX77836_PMIC_REG_INTSRC:
  94         case MAX77836_PMIC_REG_TOPSYS_INT:
  95         case MAX77836_PMIC_REG_TOPSYS_STAT:
  96                 return true;
  97         default:
  98                 break;
  99         }
 100         return false;
 101 }
 102
 103 static const struct regmap_config max14577_muic_regmap_config = {
 104         .reg_bits       = 8,
 105         .val_bits       = 8,
 106         .volatile_reg   = max14577_muic_volatile_reg,
 107         .max_register   = MAX14577_REG_END,
 108 };
 109
 110 static const struct regmap_config max77836_pmic_regmap_config = {
 111         .reg_bits       = 8,
 112         .val_bits       = 8,
 113         .volatile_reg   = max77836_muic_volatile_reg,
 114         .max_register   = MAX77836_PMIC_REG_END,
 115 };
 116
 117 static const struct regmap_irq max14577_irqs[] = {
 118         /* INT1 interrupts */
 119         { .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
 120         { .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
 121         { .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
 122         /* INT2 interrupts */
 123         { .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
 124         { .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
 125         { .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
 126         { .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
 127         { .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
 128         /* INT3 interrupts */
 129         { .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
 130         { .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
 131         { .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
 132         { .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
 133 };
 134
 135 static const struct regmap_irq_chip max14577_irq_chip = {
 136         .name                   = "max14577",
 137         .status_base            = MAX14577_REG_INT1,
 138         .mask_base              = MAX14577_REG_INTMASK1,
 139         .mask_invert            = true,
 140         .num_regs               = 3,
 141         .irqs                   = max14577_irqs,
 142         .num_irqs               = ARRAY_SIZE(max14577_irqs),
 143 };
 144
 145 static const struct regmap_irq max77836_muic_irqs[] = {
 146         /* INT1 interrupts */
 147         { .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
 148         { .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
 149         { .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
 150         { .reg_offset = 0, .mask = MAX77836_INT1_ADC1K_MASK, },
 151         /* INT2 interrupts */
 152         { .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
 153         { .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
 154         { .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
 155         { .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
 156         { .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
 157         { .reg_offset = 1, .mask = MAX77836_INT2_VIDRM_MASK, },
 158         /* INT3 interrupts */
 159         { .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
 160         { .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
 161         { .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
 162         { .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
 163 };
 164
 165 static const struct regmap_irq_chip max77836_muic_irq_chip = {
 166         .name                   = "max77836-muic",
 167         .status_base            = MAX14577_REG_INT1,
 168         .mask_base              = MAX14577_REG_INTMASK1,
 169         .mask_invert            = true,
 170         .num_regs               = 3,
 171         .irqs                   = max77836_muic_irqs,
 172         .num_irqs               = ARRAY_SIZE(max77836_muic_irqs),
 173 };
 174
 175 static const struct regmap_irq max77836_pmic_irqs[] = {
 176         { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T120C_MASK, },
 177         { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T140C_MASK, },
 178 };
 179
 180 static const struct regmap_irq_chip max77836_pmic_irq_chip = {
 181         .name                   = "max77836-pmic",
 182         .status_base            = MAX77836_PMIC_REG_TOPSYS_INT,
 183         .mask_base              = MAX77836_PMIC_REG_TOPSYS_INT_MASK,
 184         .mask_invert            = false,
 185         .num_regs               = 1,
 186         .irqs                   = max77836_pmic_irqs,
 187         .num_irqs               = ARRAY_SIZE(max77836_pmic_irqs),
 188 };
 189
 190 static void max14577_print_dev_type(struct max14577 *max14577)
 191 {
 192         u8 reg_data, vendor_id, device_id;
 193         int ret;
 194
 195         ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
 196                         &reg_data);
 197         if (ret) {
 198                 dev_err(max14577->dev,
 199                         "Failed to read DEVICEID register: %d\n", ret);
 200                 return;
 201         }
 202
 203         vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
 204                                 DEVID_VENDORID_SHIFT);
 205         device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
 206                                 DEVID_DEVICEID_SHIFT);
 207
 208         dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n",
 209                         max14577->dev_type, device_id, vendor_id);
 210 }
 211
 212 /*
 213  * Max77836 specific initialization code for driver probe.
 214  * Adds new I2C dummy device, regmap and regmap IRQ chip.
 215  * Unmasks Interrupt Source register.
 216  *
 217  * On success returns 0.
 218  * On failure returns errno and reverts any changes done so far (e.g. remove
 219  * I2C dummy device), except masking the INT SRC register.
 220  */
 221 static int max77836_init(struct max14577 *max14577)
 222 {
 223         int ret;
 224         u8 intsrc_mask;
 225
 226         max14577->i2c_pmic = i2c_new_dummy(max14577->i2c->adapter,
 227                         I2C_ADDR_PMIC);
 228         if (!max14577->i2c_pmic) {
 229                 dev_err(max14577->dev, "Failed to register PMIC I2C device\n");
 230                 return -ENODEV;
 231         }
 232         i2c_set_clientdata(max14577->i2c_pmic, max14577);
 233
 234         max14577->regmap_pmic = devm_regmap_init_i2c(max14577->i2c_pmic,
 235                         &max77836_pmic_regmap_config);
 236         if (IS_ERR(max14577->regmap_pmic)) {
 237                 ret = PTR_ERR(max14577->regmap_pmic);
 238                 dev_err(max14577->dev, "Failed to allocate PMIC register map: %d\n",
 239                                 ret);
 240                 goto err;
 241         }
 242
 243         /* Un-mask MAX77836 Interrupt Source register */
 244         ret = max14577_read_reg(max14577->regmap_pmic,
 245                         MAX77836_PMIC_REG_INTSRC_MASK, &intsrc_mask);
 246         if (ret < 0) {
 247                 dev_err(max14577->dev, "Failed to read PMIC register\n");
 248                 goto err;
 249         }
 250
 251         intsrc_mask &= ~(MAX77836_INTSRC_MASK_TOP_INT_MASK);
 252         intsrc_mask &= ~(MAX77836_INTSRC_MASK_MUIC_CHG_INT_MASK);
 253         ret = max14577_write_reg(max14577->regmap_pmic,
 254                         MAX77836_PMIC_REG_INTSRC_MASK, intsrc_mask);
 255         if (ret < 0) {
 256                 dev_err(max14577->dev, "Failed to write PMIC register\n");
 257                 goto err;
 258         }
 259
 260         ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq,
 261                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED,
 262                         0, &max77836_pmic_irq_chip,
 263                         &max14577->irq_data_pmic);
 264         if (ret != 0) {
 265                 dev_err(max14577->dev, "Failed to request PMIC IRQ %d: %d\n",
 266                                 max14577->irq, ret);
 267                 goto err;
 268         }
 269
 270         return 0;
 271
 272 err:
 273         i2c_unregister_device(max14577->i2c_pmic);
 274
 275         return ret;
 276 }
 277
 278 /*
 279  * Max77836 specific de-initialization code for driver remove.
 280  */
 281 static void max77836_remove(struct max14577 *max14577)
 282 {
 283         regmap_del_irq_chip(max14577->irq, max14577->irq_data_pmic);
 284         i2c_unregister_device(max14577->i2c_pmic);
 285 }
 286
 287 static int max14577_i2c_probe(struct i2c_client *i2c,
 288                               const struct i2c_device_id *id)
 289 {
 290         struct max14577 *max14577;
 291         struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
 292         struct device_node *np = i2c->dev.of_node;
 293         int ret = 0;
 294         const struct regmap_irq_chip *irq_chip;
 295         const struct mfd_cell *mfd_devs;
 296         unsigned int mfd_devs_size;
 297         int irq_flags;
 298
 299         if (np) {
 300                 pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
 301                 if (!pdata)
 302                         return -ENOMEM;
 303                 i2c->dev.platform_data = pdata;
 304         }
 305
 306         if (!pdata) {
 307                 dev_err(&i2c->dev, "No platform data found.\n");
 308                 return -EINVAL;
 309         }
 310
 311         max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
 312         if (!max14577)
 313                 return -ENOMEM;
 314
 315         i2c_set_clientdata(i2c, max14577);
 316         max14577->dev = &i2c->dev;
 317         max14577->i2c = i2c;
 318         max14577->irq = i2c->irq;
 319
 320         max14577->regmap = devm_regmap_init_i2c(i2c,
 321                         &max14577_muic_regmap_config);
 322         if (IS_ERR(max14577->regmap)) {
 323                 ret = PTR_ERR(max14577->regmap);
 324                 dev_err(max14577->dev, "Failed to allocate register map: %d\n",
 325                                 ret);
 326                 return ret;
 327         }
 328
 329         if (np) {
 330                 const struct of_device_id *of_id;
 331
 332                 of_id = of_match_device(max14577_dt_match, &i2c->dev);
 333                 if (of_id)
 334                         max14577->dev_type =
 335                                 (enum maxim_device_type)of_id->data;
 336         } else {
 337                 max14577->dev_type = id->driver_data;
 338         }
 339
 340         max14577_print_dev_type(max14577);
 341
 342         switch (max14577->dev_type) {
 343         case MAXIM_DEVICE_TYPE_MAX77836:
 344                 irq_chip = &max77836_muic_irq_chip;
 345                 mfd_devs = max77836_devs;
 346                 mfd_devs_size = ARRAY_SIZE(max77836_devs);
 347                 irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
 348                 break;
 349         case MAXIM_DEVICE_TYPE_MAX14577:
 350         default:
 351                 irq_chip = &max14577_irq_chip;
 352                 mfd_devs = max14577_devs;
 353                 mfd_devs_size = ARRAY_SIZE(max14577_devs);
 354                 irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
 355                 break;
 356         }
 357
 358         ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
 359                                   irq_flags, 0, irq_chip,
 360                                   &max14577->irq_data);
 361         if (ret != 0) {
 362                 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
 363                                 max14577->irq, ret);
 364                 return ret;
 365         }
 366
 367         /* Max77836 specific initialization code (additional regmap) */
 368         if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) {
 369                 ret = max77836_init(max14577);
 370                 if (ret < 0)
 371                         goto err_max77836;
 372         }
 373
 374         ret = mfd_add_devices(max14577->dev, -1, mfd_devs,
 375                         mfd_devs_size, NULL, 0,
 376                         regmap_irq_get_domain(max14577->irq_data));
 377         if (ret < 0)
 378                 goto err_mfd;
 379
 380         device_init_wakeup(max14577->dev, 1);
 381
 382         return 0;
 383
 384 err_mfd:
 385         if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
 386                 max77836_remove(max14577);
 387 err_max77836:
 388         regmap_del_irq_chip(max14577->irq, max14577->irq_data);
 389
 390         return ret;
 391 }
 392
 393 static int max14577_i2c_remove(struct i2c_client *i2c)
 394 {
 395         struct max14577 *max14577 = i2c_get_clientdata(i2c);
 396
 397         mfd_remove_devices(max14577->dev);
 398         regmap_del_irq_chip(max14577->irq, max14577->irq_data);
 399         if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
 400                 max77836_remove(max14577);
 401
 402         return 0;
 403 }
 404
 405 static const struct i2c_device_id max14577_i2c_id[] = {
 406         { "max14577", MAXIM_DEVICE_TYPE_MAX14577, },
 407         { "max77836", MAXIM_DEVICE_TYPE_MAX77836, },
 408         { }
 409 };
 410 MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);
 411
 412 #ifdef CONFIG_PM_SLEEP
 413 static int max14577_suspend(struct device *dev)
 414 {
 415         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 416         struct max14577 *max14577 = i2c_get_clientdata(i2c);
 417
 418         if (device_may_wakeup(dev))
 419                 enable_irq_wake(max14577->irq);
 420         /*
 421          * MUIC IRQ must be disabled during suspend because if it happens
 422          * while suspended it will be handled before resuming I2C.
 423          *
 424          * When device is woken up from suspend (e.g. by ADC change),
 425          * an interrupt occurs before resuming I2C bus controller.
 426          * Interrupt handler tries to read registers but this read
 427          * will fail because I2C is still suspended.
 428          */
 429         disable_irq(max14577->irq);
 430
 431         return 0;
 432 }
 433
 434 static int max14577_resume(struct device *dev)
 435 {
 436         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 437         struct max14577 *max14577 = i2c_get_clientdata(i2c);
 438
 439         if (device_may_wakeup(dev))
 440                 disable_irq_wake(max14577->irq);
 441         enable_irq(max14577->irq);
 442
 443         return 0;
 444 }
 445 #endif /* CONFIG_PM_SLEEP */
 446
 447 static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);
 448
 449 static struct i2c_driver max14577_i2c_driver = {
 450         .driver = {
 451                 .name = "max14577",
 452                 .owner = THIS_MODULE,
 453                 .pm = &max14577_pm,
 454                 .of_match_table = max14577_dt_match,
 455         },
 456         .probe = max14577_i2c_probe,
 457         .remove = max14577_i2c_remove,
 458         .id_table = max14577_i2c_id,
 459 };
 460
 461 static int __init max14577_i2c_init(void)
 462 {
 463         BUILD_BUG_ON(ARRAY_SIZE(max14577_i2c_id) != MAXIM_DEVICE_TYPE_NUM);
 464         BUILD_BUG_ON(ARRAY_SIZE(max14577_dt_match) != MAXIM_DEVICE_TYPE_NUM);
 465
 466         return i2c_add_driver(&max14577_i2c_driver);
 467 }
 468 subsys_initcall(max14577_i2c_init);
 469
 470 static void __exit max14577_i2c_exit(void)
 471 {
 472         i2c_del_driver(&max14577_i2c_driver);
 473 }
 474 module_exit(max14577_i2c_exit);
 475
 476 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>");
 477 MODULE_DESCRIPTION("Maxim 14577/77836 multi-function core driver");
 478 MODULE_LICENSE("GPL");