1 /* 2 * sec-core.c 3 * 4 * Copyright (c) 2012 Samsung Electronics Co., Ltd 5 * http://www.samsung.com 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 * 12 */ 13 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/init.h> 17 #include <linux/err.h> 18 #include <linux/slab.h> 19 #include <linux/i2c.h> 20 #include <linux/of.h> 21 #include <linux/of_irq.h> 22 #include <linux/interrupt.h> 23 #include <linux/pm_runtime.h> 24 #include <linux/mutex.h> 25 #include <linux/mfd/core.h> 26 #include <linux/mfd/samsung/core.h> 27 #include <linux/mfd/samsung/irq.h> 28 #include <linux/mfd/samsung/rtc.h> 29 #include <linux/mfd/samsung/s2mps11.h> 30 #include <linux/mfd/samsung/s5m8763.h> 31 #include <linux/mfd/samsung/s5m8767.h> 32 #include <linux/regmap.h> 33 34 static const struct mfd_cell s5m8751_devs[] = { 35 { 36 .name = "s5m8751-pmic", 37 }, { 38 .name = "s5m-charger", 39 }, { 40 .name = "s5m8751-codec", 41 }, 42 }; 43 44 static const struct mfd_cell s5m8763_devs[] = { 45 { 46 .name = "s5m8763-pmic", 47 }, { 48 .name = "s5m-rtc", 49 }, { 50 .name = "s5m-charger", 51 }, 52 }; 53 54 static const struct mfd_cell s5m8767_devs[] = { 55 { 56 .name = "s5m8767-pmic", 57 }, { 58 .name = "s5m-rtc", 59 }, 60 }; 61 62 static const struct mfd_cell s2mps11_devs[] = { 63 { 64 .name = "s2mps11-pmic", 65 }, { 66 .name = "s2mps11-clk", 67 } 68 }; 69 70 #ifdef CONFIG_OF 71 static struct of_device_id sec_dt_match[] = { 72 { .compatible = "samsung,s5m8767-pmic", 73 .data = (void *)S5M8767X, 74 }, 75 { .compatible = "samsung,s2mps11-pmic", 76 .data = (void *)S2MPS11X, 77 }, 78 {}, 79 }; 80 #endif 81 82 int sec_reg_read(struct sec_pmic_dev *sec_pmic, u8 reg, void *dest) 83 { 84 return regmap_read(sec_pmic->regmap_pmic, reg, dest); 85 } 86 EXPORT_SYMBOL_GPL(sec_reg_read); 87 88 int sec_bulk_read(struct sec_pmic_dev *sec_pmic, u8 reg, int count, u8 *buf) 89 { 90 return regmap_bulk_read(sec_pmic->regmap_pmic, reg, buf, count); 91 } 92 EXPORT_SYMBOL_GPL(sec_bulk_read); 93 94 int sec_reg_write(struct sec_pmic_dev *sec_pmic, u8 reg, u8 value) 95 { 96 return regmap_write(sec_pmic->regmap_pmic, reg, value); 97 } 98 EXPORT_SYMBOL_GPL(sec_reg_write); 99 100 int sec_bulk_write(struct sec_pmic_dev *sec_pmic, u8 reg, int count, u8 *buf) 101 { 102 return regmap_raw_write(sec_pmic->regmap_pmic, reg, buf, count); 103 } 104 EXPORT_SYMBOL_GPL(sec_bulk_write); 105 106 int sec_reg_update(struct sec_pmic_dev *sec_pmic, u8 reg, u8 val, u8 mask) 107 { 108 return regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, val); 109 } 110 EXPORT_SYMBOL_GPL(sec_reg_update); 111 112 static bool s2mps11_volatile(struct device *dev, unsigned int reg) 113 { 114 switch (reg) { 115 case S2MPS11_REG_INT1M: 116 case S2MPS11_REG_INT2M: 117 case S2MPS11_REG_INT3M: 118 return false; 119 default: 120 return true; 121 } 122 } 123 124 static bool s5m8763_volatile(struct device *dev, unsigned int reg) 125 { 126 switch (reg) { 127 case S5M8763_REG_IRQM1: 128 case S5M8763_REG_IRQM2: 129 case S5M8763_REG_IRQM3: 130 case S5M8763_REG_IRQM4: 131 return false; 132 default: 133 return true; 134 } 135 } 136 137 static struct regmap_config sec_regmap_config = { 138 .reg_bits = 8, 139 .val_bits = 8, 140 }; 141 142 static struct regmap_config s2mps11_regmap_config = { 143 .reg_bits = 8, 144 .val_bits = 8, 145 146 .max_register = S2MPS11_REG_L38CTRL, 147 .volatile_reg = s2mps11_volatile, 148 .cache_type = REGCACHE_FLAT, 149 }; 150 151 static struct regmap_config s5m8763_regmap_config = { 152 .reg_bits = 8, 153 .val_bits = 8, 154 155 .max_register = S5M8763_REG_LBCNFG2, 156 .volatile_reg = s5m8763_volatile, 157 .cache_type = REGCACHE_FLAT, 158 }; 159 160 static struct regmap_config s5m8767_regmap_config = { 161 .reg_bits = 8, 162 .val_bits = 8, 163 164 .max_register = S5M8767_REG_LDO28CTRL, 165 .volatile_reg = s2mps11_volatile, 166 .cache_type = REGCACHE_FLAT, 167 }; 168 169 static const struct regmap_config sec_rtc_regmap_config = { 170 .reg_bits = 8, 171 .val_bits = 8, 172 }; 173 174 #ifdef CONFIG_OF 175 /* 176 * Only the common platform data elements for s5m8767 are parsed here from the 177 * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and 178 * others have to parse their own platform data elements from device tree. 179 * 180 * The s5m8767 platform data structure is instantiated here and the drivers for 181 * the sub-modules need not instantiate another instance while parsing their 182 * platform data. 183 */ 184 static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata( 185 struct device *dev) 186 { 187 struct sec_platform_data *pd; 188 189 pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); 190 if (!pd) { 191 dev_err(dev, "could not allocate memory for pdata\n"); 192 return ERR_PTR(-ENOMEM); 193 } 194 195 /* 196 * ToDo: the 'wakeup' member in the platform data is more of a linux 197 * specfic information. Hence, there is no binding for that yet and 198 * not parsed here. 199 */ 200 201 return pd; 202 } 203 #else 204 static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata( 205 struct device *dev) 206 { 207 return 0; 208 } 209 #endif 210 211 static inline int sec_i2c_get_driver_data(struct i2c_client *i2c, 212 const struct i2c_device_id *id) 213 { 214 #ifdef CONFIG_OF 215 if (i2c->dev.of_node) { 216 const struct of_device_id *match; 217 match = of_match_node(sec_dt_match, i2c->dev.of_node); 218 return (int)match->data; 219 } 220 #endif 221 return (int)id->driver_data; 222 } 223 224 static int sec_pmic_probe(struct i2c_client *i2c, 225 const struct i2c_device_id *id) 226 { 227 struct sec_platform_data *pdata = dev_get_platdata(&i2c->dev); 228 const struct regmap_config *regmap; 229 struct sec_pmic_dev *sec_pmic; 230 int ret; 231 232 sec_pmic = devm_kzalloc(&i2c->dev, sizeof(struct sec_pmic_dev), 233 GFP_KERNEL); 234 if (sec_pmic == NULL) 235 return -ENOMEM; 236 237 i2c_set_clientdata(i2c, sec_pmic); 238 sec_pmic->dev = &i2c->dev; 239 sec_pmic->i2c = i2c; 240 sec_pmic->irq = i2c->irq; 241 sec_pmic->type = sec_i2c_get_driver_data(i2c, id); 242 243 if (sec_pmic->dev->of_node) { 244 pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev); 245 if (IS_ERR(pdata)) { 246 ret = PTR_ERR(pdata); 247 return ret; 248 } 249 pdata->device_type = sec_pmic->type; 250 } 251 if (pdata) { 252 sec_pmic->device_type = pdata->device_type; 253 sec_pmic->ono = pdata->ono; 254 sec_pmic->irq_base = pdata->irq_base; 255 sec_pmic->wakeup = pdata->wakeup; 256 sec_pmic->pdata = pdata; 257 } 258 259 switch (sec_pmic->device_type) { 260 case S2MPS11X: 261 regmap = &s2mps11_regmap_config; 262 break; 263 case S5M8763X: 264 regmap = &s5m8763_regmap_config; 265 break; 266 case S5M8767X: 267 regmap = &s5m8767_regmap_config; 268 break; 269 default: 270 regmap = &sec_regmap_config; 271 break; 272 } 273 274 sec_pmic->regmap_pmic = devm_regmap_init_i2c(i2c, regmap); 275 if (IS_ERR(sec_pmic->regmap_pmic)) { 276 ret = PTR_ERR(sec_pmic->regmap_pmic); 277 dev_err(&i2c->dev, "Failed to allocate register map: %d\n", 278 ret); 279 return ret; 280 } 281 282 sec_pmic->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR); 283 i2c_set_clientdata(sec_pmic->rtc, sec_pmic); 284 285 sec_pmic->regmap_rtc = devm_regmap_init_i2c(sec_pmic->rtc, 286 &sec_rtc_regmap_config); 287 if (IS_ERR(sec_pmic->regmap_rtc)) { 288 ret = PTR_ERR(sec_pmic->regmap_rtc); 289 dev_err(&i2c->dev, "Failed to allocate RTC register map: %d\n", 290 ret); 291 return ret; 292 } 293 294 if (pdata && pdata->cfg_pmic_irq) 295 pdata->cfg_pmic_irq(); 296 297 sec_irq_init(sec_pmic); 298 299 pm_runtime_set_active(sec_pmic->dev); 300 301 switch (sec_pmic->device_type) { 302 case S5M8751X: 303 ret = mfd_add_devices(sec_pmic->dev, -1, s5m8751_devs, 304 ARRAY_SIZE(s5m8751_devs), NULL, 0, NULL); 305 break; 306 case S5M8763X: 307 ret = mfd_add_devices(sec_pmic->dev, -1, s5m8763_devs, 308 ARRAY_SIZE(s5m8763_devs), NULL, 0, NULL); 309 break; 310 case S5M8767X: 311 ret = mfd_add_devices(sec_pmic->dev, -1, s5m8767_devs, 312 ARRAY_SIZE(s5m8767_devs), NULL, 0, NULL); 313 break; 314 case S2MPS11X: 315 ret = mfd_add_devices(sec_pmic->dev, -1, s2mps11_devs, 316 ARRAY_SIZE(s2mps11_devs), NULL, 0, NULL); 317 break; 318 default: 319 /* If this happens the probe function is problem */ 320 BUG(); 321 } 322 323 if (ret) 324 goto err; 325 326 device_init_wakeup(sec_pmic->dev, sec_pmic->wakeup); 327 328 return ret; 329 330 err: 331 sec_irq_exit(sec_pmic); 332 i2c_unregister_device(sec_pmic->rtc); 333 return ret; 334 } 335 336 static int sec_pmic_remove(struct i2c_client *i2c) 337 { 338 struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c); 339 340 mfd_remove_devices(sec_pmic->dev); 341 sec_irq_exit(sec_pmic); 342 i2c_unregister_device(sec_pmic->rtc); 343 return 0; 344 } 345 346 static int sec_pmic_suspend(struct device *dev) 347 { 348 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 349 struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c); 350 351 if (device_may_wakeup(dev)) { 352 enable_irq_wake(sec_pmic->irq); 353 /* 354 * PMIC IRQ must be disabled during suspend for RTC alarm 355 * to work properly. 356 * When device is woken up from suspend by RTC Alarm, an 357 * interrupt occurs before resuming I2C bus controller. 358 * The interrupt is handled by regmap_irq_thread which tries 359 * to read RTC registers. This read fails (I2C is still 360 * suspended) and RTC Alarm interrupt is disabled. 361 */ 362 disable_irq(sec_pmic->irq); 363 } 364 365 return 0; 366 } 367 368 static int sec_pmic_resume(struct device *dev) 369 { 370 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 371 struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c); 372 373 if (device_may_wakeup(dev)) { 374 disable_irq_wake(sec_pmic->irq); 375 enable_irq(sec_pmic->irq); 376 } 377 378 return 0; 379 } 380 381 static SIMPLE_DEV_PM_OPS(sec_pmic_pm_ops, sec_pmic_suspend, sec_pmic_resume); 382 383 static const struct i2c_device_id sec_pmic_id[] = { 384 { "sec_pmic", 0 }, 385 { } 386 }; 387 MODULE_DEVICE_TABLE(i2c, sec_pmic_id); 388 389 static struct i2c_driver sec_pmic_driver = { 390 .driver = { 391 .name = "sec_pmic", 392 .owner = THIS_MODULE, 393 .pm = &sec_pmic_pm_ops, 394 .of_match_table = of_match_ptr(sec_dt_match), 395 }, 396 .probe = sec_pmic_probe, 397 .remove = sec_pmic_remove, 398 .id_table = sec_pmic_id, 399 }; 400 401 static int __init sec_pmic_init(void) 402 { 403 return i2c_add_driver(&sec_pmic_driver); 404 } 405 406 subsys_initcall(sec_pmic_init); 407 408 static void __exit sec_pmic_exit(void) 409 { 410 i2c_del_driver(&sec_pmic_driver); 411 } 412 module_exit(sec_pmic_exit); 413 414 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>"); 415 MODULE_DESCRIPTION("Core support for the S5M MFD"); 416 MODULE_LICENSE("GPL"); 417