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_device.h> 15 #include <linux/of_irq.h> 16 #include <linux/interrupt.h> 17 #include <linux/pm_runtime.h> 18 #include <linux/init.h> 19 #include <linux/mutex.h> 20 #include <linux/mfd/core.h> 21 #include <linux/mfd/max8997.h> 22 #include <linux/mfd/max8997-private.h> 23 24 #define I2C_ADDR_PMIC (0xCC >> 1) 25 #define I2C_ADDR_MUIC (0x4A >> 1) 26 #define I2C_ADDR_BATTERY (0x6C >> 1) 27 #define I2C_ADDR_RTC (0x0C >> 1) 28 #define I2C_ADDR_HAPTIC (0x90 >> 1) 29 30 static const struct mfd_cell max8997_devs[] = { 31 { .name = "max8997-pmic", }, 32 { .name = "max8997-rtc", }, 33 { .name = "max8997-battery", }, 34 { .name = "max8997-haptic", }, 35 { .name = "max8997-muic", }, 36 { .name = "max8997-led", .id = 1 }, 37 { .name = "max8997-led", .id = 2 }, 38 }; 39 40 #ifdef CONFIG_OF 41 static const struct of_device_id max8997_pmic_dt_match[] = { 42 { .compatible = "maxim,max8997-pmic", .data = (void *)TYPE_MAX8997 }, 43 {}, 44 }; 45 #endif 46 47 int max8997_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest) 48 { 49 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 50 int ret; 51 52 mutex_lock(&max8997->iolock); 53 ret = i2c_smbus_read_byte_data(i2c, reg); 54 mutex_unlock(&max8997->iolock); 55 if (ret < 0) 56 return ret; 57 58 ret &= 0xff; 59 *dest = ret; 60 return 0; 61 } 62 EXPORT_SYMBOL_GPL(max8997_read_reg); 63 64 int max8997_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf) 65 { 66 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 67 int ret; 68 69 mutex_lock(&max8997->iolock); 70 ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf); 71 mutex_unlock(&max8997->iolock); 72 if (ret < 0) 73 return ret; 74 75 return 0; 76 } 77 EXPORT_SYMBOL_GPL(max8997_bulk_read); 78 79 int max8997_write_reg(struct i2c_client *i2c, u8 reg, u8 value) 80 { 81 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 82 int ret; 83 84 mutex_lock(&max8997->iolock); 85 ret = i2c_smbus_write_byte_data(i2c, reg, value); 86 mutex_unlock(&max8997->iolock); 87 return ret; 88 } 89 EXPORT_SYMBOL_GPL(max8997_write_reg); 90 91 int max8997_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf) 92 { 93 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 94 int ret; 95 96 mutex_lock(&max8997->iolock); 97 ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf); 98 mutex_unlock(&max8997->iolock); 99 if (ret < 0) 100 return ret; 101 102 return 0; 103 } 104 EXPORT_SYMBOL_GPL(max8997_bulk_write); 105 106 int max8997_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask) 107 { 108 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 109 int ret; 110 111 mutex_lock(&max8997->iolock); 112 ret = i2c_smbus_read_byte_data(i2c, reg); 113 if (ret >= 0) { 114 u8 old_val = ret & 0xff; 115 u8 new_val = (val & mask) | (old_val & (~mask)); 116 ret = i2c_smbus_write_byte_data(i2c, reg, new_val); 117 } 118 mutex_unlock(&max8997->iolock); 119 return ret; 120 } 121 EXPORT_SYMBOL_GPL(max8997_update_reg); 122 123 /* 124 * Only the common platform data elements for max8997 are parsed here from the 125 * device tree. Other sub-modules of max8997 such as pmic, rtc and others have 126 * to parse their own platform data elements from device tree. 127 * 128 * The max8997 platform data structure is instantiated here and the drivers for 129 * the sub-modules need not instantiate another instance while parsing their 130 * platform data. 131 */ 132 static struct max8997_platform_data *max8997_i2c_parse_dt_pdata( 133 struct device *dev) 134 { 135 struct max8997_platform_data *pd; 136 137 pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); 138 if (!pd) 139 return ERR_PTR(-ENOMEM); 140 141 pd->ono = irq_of_parse_and_map(dev->of_node, 1); 142 143 return pd; 144 } 145 146 static inline unsigned long max8997_i2c_get_driver_data(struct i2c_client *i2c, 147 const struct i2c_device_id *id) 148 { 149 if (i2c->dev.of_node) 150 return (unsigned long)of_device_get_match_data(&i2c->dev); 151 152 return id->driver_data; 153 } 154 155 static int max8997_i2c_probe(struct i2c_client *i2c) 156 { 157 const struct i2c_device_id *id = i2c_client_get_device_id(i2c); 158 struct max8997_dev *max8997; 159 struct max8997_platform_data *pdata = dev_get_platdata(&i2c->dev); 160 int ret = 0; 161 162 max8997 = devm_kzalloc(&i2c->dev, sizeof(struct max8997_dev), 163 GFP_KERNEL); 164 if (max8997 == NULL) 165 return -ENOMEM; 166 167 i2c_set_clientdata(i2c, max8997); 168 max8997->dev = &i2c->dev; 169 max8997->i2c = i2c; 170 max8997->type = max8997_i2c_get_driver_data(i2c, id); 171 max8997->irq = i2c->irq; 172 173 if (IS_ENABLED(CONFIG_OF) && max8997->dev->of_node) { 174 pdata = max8997_i2c_parse_dt_pdata(max8997->dev); 175 if (IS_ERR(pdata)) 176 return PTR_ERR(pdata); 177 } 178 179 if (!pdata) 180 return ret; 181 182 max8997->pdata = pdata; 183 max8997->ono = pdata->ono; 184 185 mutex_init(&max8997->iolock); 186 187 max8997->rtc = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_RTC); 188 if (IS_ERR(max8997->rtc)) { 189 dev_err(max8997->dev, "Failed to allocate I2C device for RTC\n"); 190 return PTR_ERR(max8997->rtc); 191 } 192 i2c_set_clientdata(max8997->rtc, max8997); 193 194 max8997->haptic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_HAPTIC); 195 if (IS_ERR(max8997->haptic)) { 196 dev_err(max8997->dev, "Failed to allocate I2C device for Haptic\n"); 197 ret = PTR_ERR(max8997->haptic); 198 goto err_i2c_haptic; 199 } 200 i2c_set_clientdata(max8997->haptic, max8997); 201 202 max8997->muic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_MUIC); 203 if (IS_ERR(max8997->muic)) { 204 dev_err(max8997->dev, "Failed to allocate I2C device for MUIC\n"); 205 ret = PTR_ERR(max8997->muic); 206 goto err_i2c_muic; 207 } 208 i2c_set_clientdata(max8997->muic, max8997); 209 210 pm_runtime_set_active(max8997->dev); 211 212 max8997_irq_init(max8997); 213 214 ret = mfd_add_devices(max8997->dev, -1, max8997_devs, 215 ARRAY_SIZE(max8997_devs), 216 NULL, 0, NULL); 217 if (ret < 0) { 218 dev_err(max8997->dev, "failed to add MFD devices %d\n", ret); 219 goto err_mfd; 220 } 221 222 /* 223 * TODO: enable others (flash, muic, rtc, battery, ...) and 224 * check the return value 225 */ 226 227 /* MAX8997 has a power button input. */ 228 device_init_wakeup(max8997->dev, true); 229 230 return ret; 231 232 err_mfd: 233 mfd_remove_devices(max8997->dev); 234 i2c_unregister_device(max8997->muic); 235 err_i2c_muic: 236 i2c_unregister_device(max8997->haptic); 237 err_i2c_haptic: 238 i2c_unregister_device(max8997->rtc); 239 return ret; 240 } 241 242 static const struct i2c_device_id max8997_i2c_id[] = { 243 { "max8997", TYPE_MAX8997 }, 244 { "max8966", TYPE_MAX8966 }, 245 { } 246 }; 247 248 static u8 max8997_dumpaddr_pmic[] = { 249 MAX8997_REG_INT1MSK, 250 MAX8997_REG_INT2MSK, 251 MAX8997_REG_INT3MSK, 252 MAX8997_REG_INT4MSK, 253 MAX8997_REG_MAINCON1, 254 MAX8997_REG_MAINCON2, 255 MAX8997_REG_BUCKRAMP, 256 MAX8997_REG_BUCK1CTRL, 257 MAX8997_REG_BUCK1DVS1, 258 MAX8997_REG_BUCK1DVS2, 259 MAX8997_REG_BUCK1DVS3, 260 MAX8997_REG_BUCK1DVS4, 261 MAX8997_REG_BUCK1DVS5, 262 MAX8997_REG_BUCK1DVS6, 263 MAX8997_REG_BUCK1DVS7, 264 MAX8997_REG_BUCK1DVS8, 265 MAX8997_REG_BUCK2CTRL, 266 MAX8997_REG_BUCK2DVS1, 267 MAX8997_REG_BUCK2DVS2, 268 MAX8997_REG_BUCK2DVS3, 269 MAX8997_REG_BUCK2DVS4, 270 MAX8997_REG_BUCK2DVS5, 271 MAX8997_REG_BUCK2DVS6, 272 MAX8997_REG_BUCK2DVS7, 273 MAX8997_REG_BUCK2DVS8, 274 MAX8997_REG_BUCK3CTRL, 275 MAX8997_REG_BUCK3DVS, 276 MAX8997_REG_BUCK4CTRL, 277 MAX8997_REG_BUCK4DVS, 278 MAX8997_REG_BUCK5CTRL, 279 MAX8997_REG_BUCK5DVS1, 280 MAX8997_REG_BUCK5DVS2, 281 MAX8997_REG_BUCK5DVS3, 282 MAX8997_REG_BUCK5DVS4, 283 MAX8997_REG_BUCK5DVS5, 284 MAX8997_REG_BUCK5DVS6, 285 MAX8997_REG_BUCK5DVS7, 286 MAX8997_REG_BUCK5DVS8, 287 MAX8997_REG_BUCK6CTRL, 288 MAX8997_REG_BUCK6BPSKIPCTRL, 289 MAX8997_REG_BUCK7CTRL, 290 MAX8997_REG_BUCK7DVS, 291 MAX8997_REG_LDO1CTRL, 292 MAX8997_REG_LDO2CTRL, 293 MAX8997_REG_LDO3CTRL, 294 MAX8997_REG_LDO4CTRL, 295 MAX8997_REG_LDO5CTRL, 296 MAX8997_REG_LDO6CTRL, 297 MAX8997_REG_LDO7CTRL, 298 MAX8997_REG_LDO8CTRL, 299 MAX8997_REG_LDO9CTRL, 300 MAX8997_REG_LDO10CTRL, 301 MAX8997_REG_LDO11CTRL, 302 MAX8997_REG_LDO12CTRL, 303 MAX8997_REG_LDO13CTRL, 304 MAX8997_REG_LDO14CTRL, 305 MAX8997_REG_LDO15CTRL, 306 MAX8997_REG_LDO16CTRL, 307 MAX8997_REG_LDO17CTRL, 308 MAX8997_REG_LDO18CTRL, 309 MAX8997_REG_LDO21CTRL, 310 MAX8997_REG_MBCCTRL1, 311 MAX8997_REG_MBCCTRL2, 312 MAX8997_REG_MBCCTRL3, 313 MAX8997_REG_MBCCTRL4, 314 MAX8997_REG_MBCCTRL5, 315 MAX8997_REG_MBCCTRL6, 316 MAX8997_REG_OTPCGHCVS, 317 MAX8997_REG_SAFEOUTCTRL, 318 MAX8997_REG_LBCNFG1, 319 MAX8997_REG_LBCNFG2, 320 MAX8997_REG_BBCCTRL, 321 322 MAX8997_REG_FLASH1_CUR, 323 MAX8997_REG_FLASH2_CUR, 324 MAX8997_REG_MOVIE_CUR, 325 MAX8997_REG_GSMB_CUR, 326 MAX8997_REG_BOOST_CNTL, 327 MAX8997_REG_LEN_CNTL, 328 MAX8997_REG_FLASH_CNTL, 329 MAX8997_REG_WDT_CNTL, 330 MAX8997_REG_MAXFLASH1, 331 MAX8997_REG_MAXFLASH2, 332 MAX8997_REG_FLASHSTATUSMASK, 333 334 MAX8997_REG_GPIOCNTL1, 335 MAX8997_REG_GPIOCNTL2, 336 MAX8997_REG_GPIOCNTL3, 337 MAX8997_REG_GPIOCNTL4, 338 MAX8997_REG_GPIOCNTL5, 339 MAX8997_REG_GPIOCNTL6, 340 MAX8997_REG_GPIOCNTL7, 341 MAX8997_REG_GPIOCNTL8, 342 MAX8997_REG_GPIOCNTL9, 343 MAX8997_REG_GPIOCNTL10, 344 MAX8997_REG_GPIOCNTL11, 345 MAX8997_REG_GPIOCNTL12, 346 347 MAX8997_REG_LDO1CONFIG, 348 MAX8997_REG_LDO2CONFIG, 349 MAX8997_REG_LDO3CONFIG, 350 MAX8997_REG_LDO4CONFIG, 351 MAX8997_REG_LDO5CONFIG, 352 MAX8997_REG_LDO6CONFIG, 353 MAX8997_REG_LDO7CONFIG, 354 MAX8997_REG_LDO8CONFIG, 355 MAX8997_REG_LDO9CONFIG, 356 MAX8997_REG_LDO10CONFIG, 357 MAX8997_REG_LDO11CONFIG, 358 MAX8997_REG_LDO12CONFIG, 359 MAX8997_REG_LDO13CONFIG, 360 MAX8997_REG_LDO14CONFIG, 361 MAX8997_REG_LDO15CONFIG, 362 MAX8997_REG_LDO16CONFIG, 363 MAX8997_REG_LDO17CONFIG, 364 MAX8997_REG_LDO18CONFIG, 365 MAX8997_REG_LDO21CONFIG, 366 367 MAX8997_REG_DVSOKTIMER1, 368 MAX8997_REG_DVSOKTIMER2, 369 MAX8997_REG_DVSOKTIMER4, 370 MAX8997_REG_DVSOKTIMER5, 371 }; 372 373 static u8 max8997_dumpaddr_muic[] = { 374 MAX8997_MUIC_REG_INTMASK1, 375 MAX8997_MUIC_REG_INTMASK2, 376 MAX8997_MUIC_REG_INTMASK3, 377 MAX8997_MUIC_REG_CDETCTRL, 378 MAX8997_MUIC_REG_CONTROL1, 379 MAX8997_MUIC_REG_CONTROL2, 380 MAX8997_MUIC_REG_CONTROL3, 381 }; 382 383 static u8 max8997_dumpaddr_haptic[] = { 384 MAX8997_HAPTIC_REG_CONF1, 385 MAX8997_HAPTIC_REG_CONF2, 386 MAX8997_HAPTIC_REG_DRVCONF, 387 MAX8997_HAPTIC_REG_CYCLECONF1, 388 MAX8997_HAPTIC_REG_CYCLECONF2, 389 MAX8997_HAPTIC_REG_SIGCONF1, 390 MAX8997_HAPTIC_REG_SIGCONF2, 391 MAX8997_HAPTIC_REG_SIGCONF3, 392 MAX8997_HAPTIC_REG_SIGCONF4, 393 MAX8997_HAPTIC_REG_SIGDC1, 394 MAX8997_HAPTIC_REG_SIGDC2, 395 MAX8997_HAPTIC_REG_SIGPWMDC1, 396 MAX8997_HAPTIC_REG_SIGPWMDC2, 397 MAX8997_HAPTIC_REG_SIGPWMDC3, 398 MAX8997_HAPTIC_REG_SIGPWMDC4, 399 }; 400 401 static int max8997_freeze(struct device *dev) 402 { 403 struct i2c_client *i2c = to_i2c_client(dev); 404 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 405 int i; 406 407 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++) 408 max8997_read_reg(i2c, max8997_dumpaddr_pmic[i], 409 &max8997->reg_dump[i]); 410 411 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++) 412 max8997_read_reg(i2c, max8997_dumpaddr_muic[i], 413 &max8997->reg_dump[i + MAX8997_REG_PMIC_END]); 414 415 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++) 416 max8997_read_reg(i2c, max8997_dumpaddr_haptic[i], 417 &max8997->reg_dump[i + MAX8997_REG_PMIC_END + 418 MAX8997_MUIC_REG_END]); 419 420 return 0; 421 } 422 423 static int max8997_restore(struct device *dev) 424 { 425 struct i2c_client *i2c = to_i2c_client(dev); 426 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 427 int i; 428 429 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++) 430 max8997_write_reg(i2c, max8997_dumpaddr_pmic[i], 431 max8997->reg_dump[i]); 432 433 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++) 434 max8997_write_reg(i2c, max8997_dumpaddr_muic[i], 435 max8997->reg_dump[i + MAX8997_REG_PMIC_END]); 436 437 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++) 438 max8997_write_reg(i2c, max8997_dumpaddr_haptic[i], 439 max8997->reg_dump[i + MAX8997_REG_PMIC_END + 440 MAX8997_MUIC_REG_END]); 441 442 return 0; 443 } 444 445 static int max8997_suspend(struct device *dev) 446 { 447 struct i2c_client *i2c = to_i2c_client(dev); 448 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 449 450 disable_irq(max8997->irq); 451 if (device_may_wakeup(dev)) 452 irq_set_irq_wake(max8997->irq, 1); 453 return 0; 454 } 455 456 static int max8997_resume(struct device *dev) 457 { 458 struct i2c_client *i2c = to_i2c_client(dev); 459 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 460 461 if (device_may_wakeup(dev)) 462 irq_set_irq_wake(max8997->irq, 0); 463 enable_irq(max8997->irq); 464 return max8997_irq_resume(max8997); 465 } 466 467 static const struct dev_pm_ops max8997_pm = { 468 .suspend = max8997_suspend, 469 .resume = max8997_resume, 470 .freeze = max8997_freeze, 471 .restore = max8997_restore, 472 }; 473 474 static struct i2c_driver max8997_i2c_driver = { 475 .driver = { 476 .name = "max8997", 477 .pm = &max8997_pm, 478 .suppress_bind_attrs = true, 479 .of_match_table = of_match_ptr(max8997_pmic_dt_match), 480 }, 481 .probe = max8997_i2c_probe, 482 .id_table = max8997_i2c_id, 483 }; 484 485 static int __init max8997_i2c_init(void) 486 { 487 return i2c_add_driver(&max8997_i2c_driver); 488 } 489 /* init early so consumer devices can complete system boot */ 490 subsys_initcall(max8997_i2c_init); 491