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