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 int max8997_i2c_probe(struct i2c_client *i2c) 146 { 147 struct max8997_dev *max8997; 148 struct max8997_platform_data *pdata = dev_get_platdata(&i2c->dev); 149 int ret = 0; 150 151 max8997 = devm_kzalloc(&i2c->dev, sizeof(struct max8997_dev), 152 GFP_KERNEL); 153 if (max8997 == NULL) 154 return -ENOMEM; 155 156 i2c_set_clientdata(i2c, max8997); 157 max8997->dev = &i2c->dev; 158 max8997->i2c = i2c; 159 max8997->type = (uintptr_t)i2c_get_match_data(i2c); 160 max8997->irq = i2c->irq; 161 162 if (IS_ENABLED(CONFIG_OF) && max8997->dev->of_node) { 163 pdata = max8997_i2c_parse_dt_pdata(max8997->dev); 164 if (IS_ERR(pdata)) 165 return PTR_ERR(pdata); 166 } 167 168 if (!pdata) 169 return ret; 170 171 max8997->pdata = pdata; 172 max8997->ono = pdata->ono; 173 174 mutex_init(&max8997->iolock); 175 176 max8997->rtc = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_RTC); 177 if (IS_ERR(max8997->rtc)) { 178 dev_err(max8997->dev, "Failed to allocate I2C device for RTC\n"); 179 return PTR_ERR(max8997->rtc); 180 } 181 i2c_set_clientdata(max8997->rtc, max8997); 182 183 max8997->haptic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_HAPTIC); 184 if (IS_ERR(max8997->haptic)) { 185 dev_err(max8997->dev, "Failed to allocate I2C device for Haptic\n"); 186 ret = PTR_ERR(max8997->haptic); 187 goto err_i2c_haptic; 188 } 189 i2c_set_clientdata(max8997->haptic, max8997); 190 191 max8997->muic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_MUIC); 192 if (IS_ERR(max8997->muic)) { 193 dev_err(max8997->dev, "Failed to allocate I2C device for MUIC\n"); 194 ret = PTR_ERR(max8997->muic); 195 goto err_i2c_muic; 196 } 197 i2c_set_clientdata(max8997->muic, max8997); 198 199 pm_runtime_set_active(max8997->dev); 200 201 max8997_irq_init(max8997); 202 203 ret = mfd_add_devices(max8997->dev, -1, max8997_devs, 204 ARRAY_SIZE(max8997_devs), 205 NULL, 0, NULL); 206 if (ret < 0) { 207 dev_err(max8997->dev, "failed to add MFD devices %d\n", ret); 208 goto err_mfd; 209 } 210 211 /* 212 * TODO: enable others (flash, muic, rtc, battery, ...) and 213 * check the return value 214 */ 215 216 /* MAX8997 has a power button input. */ 217 device_init_wakeup(max8997->dev, true); 218 219 return ret; 220 221 err_mfd: 222 mfd_remove_devices(max8997->dev); 223 i2c_unregister_device(max8997->muic); 224 err_i2c_muic: 225 i2c_unregister_device(max8997->haptic); 226 err_i2c_haptic: 227 i2c_unregister_device(max8997->rtc); 228 return ret; 229 } 230 231 static const struct i2c_device_id max8997_i2c_id[] = { 232 { "max8997", TYPE_MAX8997 }, 233 { "max8966", TYPE_MAX8966 }, 234 { } 235 }; 236 237 static u8 max8997_dumpaddr_pmic[] = { 238 MAX8997_REG_INT1MSK, 239 MAX8997_REG_INT2MSK, 240 MAX8997_REG_INT3MSK, 241 MAX8997_REG_INT4MSK, 242 MAX8997_REG_MAINCON1, 243 MAX8997_REG_MAINCON2, 244 MAX8997_REG_BUCKRAMP, 245 MAX8997_REG_BUCK1CTRL, 246 MAX8997_REG_BUCK1DVS1, 247 MAX8997_REG_BUCK1DVS2, 248 MAX8997_REG_BUCK1DVS3, 249 MAX8997_REG_BUCK1DVS4, 250 MAX8997_REG_BUCK1DVS5, 251 MAX8997_REG_BUCK1DVS6, 252 MAX8997_REG_BUCK1DVS7, 253 MAX8997_REG_BUCK1DVS8, 254 MAX8997_REG_BUCK2CTRL, 255 MAX8997_REG_BUCK2DVS1, 256 MAX8997_REG_BUCK2DVS2, 257 MAX8997_REG_BUCK2DVS3, 258 MAX8997_REG_BUCK2DVS4, 259 MAX8997_REG_BUCK2DVS5, 260 MAX8997_REG_BUCK2DVS6, 261 MAX8997_REG_BUCK2DVS7, 262 MAX8997_REG_BUCK2DVS8, 263 MAX8997_REG_BUCK3CTRL, 264 MAX8997_REG_BUCK3DVS, 265 MAX8997_REG_BUCK4CTRL, 266 MAX8997_REG_BUCK4DVS, 267 MAX8997_REG_BUCK5CTRL, 268 MAX8997_REG_BUCK5DVS1, 269 MAX8997_REG_BUCK5DVS2, 270 MAX8997_REG_BUCK5DVS3, 271 MAX8997_REG_BUCK5DVS4, 272 MAX8997_REG_BUCK5DVS5, 273 MAX8997_REG_BUCK5DVS6, 274 MAX8997_REG_BUCK5DVS7, 275 MAX8997_REG_BUCK5DVS8, 276 MAX8997_REG_BUCK6CTRL, 277 MAX8997_REG_BUCK6BPSKIPCTRL, 278 MAX8997_REG_BUCK7CTRL, 279 MAX8997_REG_BUCK7DVS, 280 MAX8997_REG_LDO1CTRL, 281 MAX8997_REG_LDO2CTRL, 282 MAX8997_REG_LDO3CTRL, 283 MAX8997_REG_LDO4CTRL, 284 MAX8997_REG_LDO5CTRL, 285 MAX8997_REG_LDO6CTRL, 286 MAX8997_REG_LDO7CTRL, 287 MAX8997_REG_LDO8CTRL, 288 MAX8997_REG_LDO9CTRL, 289 MAX8997_REG_LDO10CTRL, 290 MAX8997_REG_LDO11CTRL, 291 MAX8997_REG_LDO12CTRL, 292 MAX8997_REG_LDO13CTRL, 293 MAX8997_REG_LDO14CTRL, 294 MAX8997_REG_LDO15CTRL, 295 MAX8997_REG_LDO16CTRL, 296 MAX8997_REG_LDO17CTRL, 297 MAX8997_REG_LDO18CTRL, 298 MAX8997_REG_LDO21CTRL, 299 MAX8997_REG_MBCCTRL1, 300 MAX8997_REG_MBCCTRL2, 301 MAX8997_REG_MBCCTRL3, 302 MAX8997_REG_MBCCTRL4, 303 MAX8997_REG_MBCCTRL5, 304 MAX8997_REG_MBCCTRL6, 305 MAX8997_REG_OTPCGHCVS, 306 MAX8997_REG_SAFEOUTCTRL, 307 MAX8997_REG_LBCNFG1, 308 MAX8997_REG_LBCNFG2, 309 MAX8997_REG_BBCCTRL, 310 311 MAX8997_REG_FLASH1_CUR, 312 MAX8997_REG_FLASH2_CUR, 313 MAX8997_REG_MOVIE_CUR, 314 MAX8997_REG_GSMB_CUR, 315 MAX8997_REG_BOOST_CNTL, 316 MAX8997_REG_LEN_CNTL, 317 MAX8997_REG_FLASH_CNTL, 318 MAX8997_REG_WDT_CNTL, 319 MAX8997_REG_MAXFLASH1, 320 MAX8997_REG_MAXFLASH2, 321 MAX8997_REG_FLASHSTATUSMASK, 322 323 MAX8997_REG_GPIOCNTL1, 324 MAX8997_REG_GPIOCNTL2, 325 MAX8997_REG_GPIOCNTL3, 326 MAX8997_REG_GPIOCNTL4, 327 MAX8997_REG_GPIOCNTL5, 328 MAX8997_REG_GPIOCNTL6, 329 MAX8997_REG_GPIOCNTL7, 330 MAX8997_REG_GPIOCNTL8, 331 MAX8997_REG_GPIOCNTL9, 332 MAX8997_REG_GPIOCNTL10, 333 MAX8997_REG_GPIOCNTL11, 334 MAX8997_REG_GPIOCNTL12, 335 336 MAX8997_REG_LDO1CONFIG, 337 MAX8997_REG_LDO2CONFIG, 338 MAX8997_REG_LDO3CONFIG, 339 MAX8997_REG_LDO4CONFIG, 340 MAX8997_REG_LDO5CONFIG, 341 MAX8997_REG_LDO6CONFIG, 342 MAX8997_REG_LDO7CONFIG, 343 MAX8997_REG_LDO8CONFIG, 344 MAX8997_REG_LDO9CONFIG, 345 MAX8997_REG_LDO10CONFIG, 346 MAX8997_REG_LDO11CONFIG, 347 MAX8997_REG_LDO12CONFIG, 348 MAX8997_REG_LDO13CONFIG, 349 MAX8997_REG_LDO14CONFIG, 350 MAX8997_REG_LDO15CONFIG, 351 MAX8997_REG_LDO16CONFIG, 352 MAX8997_REG_LDO17CONFIG, 353 MAX8997_REG_LDO18CONFIG, 354 MAX8997_REG_LDO21CONFIG, 355 356 MAX8997_REG_DVSOKTIMER1, 357 MAX8997_REG_DVSOKTIMER2, 358 MAX8997_REG_DVSOKTIMER4, 359 MAX8997_REG_DVSOKTIMER5, 360 }; 361 362 static u8 max8997_dumpaddr_muic[] = { 363 MAX8997_MUIC_REG_INTMASK1, 364 MAX8997_MUIC_REG_INTMASK2, 365 MAX8997_MUIC_REG_INTMASK3, 366 MAX8997_MUIC_REG_CDETCTRL, 367 MAX8997_MUIC_REG_CONTROL1, 368 MAX8997_MUIC_REG_CONTROL2, 369 MAX8997_MUIC_REG_CONTROL3, 370 }; 371 372 static u8 max8997_dumpaddr_haptic[] = { 373 MAX8997_HAPTIC_REG_CONF1, 374 MAX8997_HAPTIC_REG_CONF2, 375 MAX8997_HAPTIC_REG_DRVCONF, 376 MAX8997_HAPTIC_REG_CYCLECONF1, 377 MAX8997_HAPTIC_REG_CYCLECONF2, 378 MAX8997_HAPTIC_REG_SIGCONF1, 379 MAX8997_HAPTIC_REG_SIGCONF2, 380 MAX8997_HAPTIC_REG_SIGCONF3, 381 MAX8997_HAPTIC_REG_SIGCONF4, 382 MAX8997_HAPTIC_REG_SIGDC1, 383 MAX8997_HAPTIC_REG_SIGDC2, 384 MAX8997_HAPTIC_REG_SIGPWMDC1, 385 MAX8997_HAPTIC_REG_SIGPWMDC2, 386 MAX8997_HAPTIC_REG_SIGPWMDC3, 387 MAX8997_HAPTIC_REG_SIGPWMDC4, 388 }; 389 390 static int max8997_freeze(struct device *dev) 391 { 392 struct i2c_client *i2c = to_i2c_client(dev); 393 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 394 int i; 395 396 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++) 397 max8997_read_reg(i2c, max8997_dumpaddr_pmic[i], 398 &max8997->reg_dump[i]); 399 400 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++) 401 max8997_read_reg(i2c, max8997_dumpaddr_muic[i], 402 &max8997->reg_dump[i + MAX8997_REG_PMIC_END]); 403 404 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++) 405 max8997_read_reg(i2c, max8997_dumpaddr_haptic[i], 406 &max8997->reg_dump[i + MAX8997_REG_PMIC_END + 407 MAX8997_MUIC_REG_END]); 408 409 return 0; 410 } 411 412 static int max8997_restore(struct device *dev) 413 { 414 struct i2c_client *i2c = to_i2c_client(dev); 415 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 416 int i; 417 418 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++) 419 max8997_write_reg(i2c, max8997_dumpaddr_pmic[i], 420 max8997->reg_dump[i]); 421 422 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++) 423 max8997_write_reg(i2c, max8997_dumpaddr_muic[i], 424 max8997->reg_dump[i + MAX8997_REG_PMIC_END]); 425 426 for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++) 427 max8997_write_reg(i2c, max8997_dumpaddr_haptic[i], 428 max8997->reg_dump[i + MAX8997_REG_PMIC_END + 429 MAX8997_MUIC_REG_END]); 430 431 return 0; 432 } 433 434 static int max8997_suspend(struct device *dev) 435 { 436 struct i2c_client *i2c = to_i2c_client(dev); 437 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 438 439 disable_irq(max8997->irq); 440 if (device_may_wakeup(dev)) 441 irq_set_irq_wake(max8997->irq, 1); 442 return 0; 443 } 444 445 static int max8997_resume(struct device *dev) 446 { 447 struct i2c_client *i2c = to_i2c_client(dev); 448 struct max8997_dev *max8997 = i2c_get_clientdata(i2c); 449 450 if (device_may_wakeup(dev)) 451 irq_set_irq_wake(max8997->irq, 0); 452 enable_irq(max8997->irq); 453 return max8997_irq_resume(max8997); 454 } 455 456 static const struct dev_pm_ops max8997_pm = { 457 .suspend = max8997_suspend, 458 .resume = max8997_resume, 459 .freeze = max8997_freeze, 460 .restore = max8997_restore, 461 }; 462 463 static struct i2c_driver max8997_i2c_driver = { 464 .driver = { 465 .name = "max8997", 466 .pm = &max8997_pm, 467 .suppress_bind_attrs = true, 468 .of_match_table = of_match_ptr(max8997_pmic_dt_match), 469 }, 470 .probe = max8997_i2c_probe, 471 .id_table = max8997_i2c_id, 472 }; 473 474 static int __init max8997_i2c_init(void) 475 { 476 return i2c_add_driver(&max8997_i2c_driver); 477 } 478 /* init early so consumer devices can complete system boot */ 479 subsys_initcall(max8997_i2c_init); 480