1 /* 2 * max8998.c - mfd core driver for the Maxim 8998 3 * 4 * Copyright (C) 2009-2010 Samsung Electronics 5 * Kyungmin Park <kyungmin.park@samsung.com> 6 * Marek Szyprowski <m.szyprowski@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 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 */ 22 23 #include <linux/module.h> 24 #include <linux/moduleparam.h> 25 #include <linux/init.h> 26 #include <linux/slab.h> 27 #include <linux/i2c.h> 28 #include <linux/interrupt.h> 29 #include <linux/pm_runtime.h> 30 #include <linux/mutex.h> 31 #include <linux/mfd/core.h> 32 #include <linux/mfd/max8998.h> 33 #include <linux/mfd/max8998-private.h> 34 35 #define RTC_I2C_ADDR (0x0c >> 1) 36 37 static struct mfd_cell max8998_devs[] = { 38 { 39 .name = "max8998-pmic", 40 }, { 41 .name = "max8998-rtc", 42 }, { 43 .name = "max8998-battery", 44 }, 45 }; 46 47 static struct mfd_cell lp3974_devs[] = { 48 { 49 .name = "lp3974-pmic", 50 }, { 51 .name = "lp3974-rtc", 52 }, 53 }; 54 55 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest) 56 { 57 struct max8998_dev *max8998 = i2c_get_clientdata(i2c); 58 int ret; 59 60 mutex_lock(&max8998->iolock); 61 ret = i2c_smbus_read_byte_data(i2c, reg); 62 mutex_unlock(&max8998->iolock); 63 if (ret < 0) 64 return ret; 65 66 ret &= 0xff; 67 *dest = ret; 68 return 0; 69 } 70 EXPORT_SYMBOL(max8998_read_reg); 71 72 int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf) 73 { 74 struct max8998_dev *max8998 = i2c_get_clientdata(i2c); 75 int ret; 76 77 mutex_lock(&max8998->iolock); 78 ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf); 79 mutex_unlock(&max8998->iolock); 80 if (ret < 0) 81 return ret; 82 83 return 0; 84 } 85 EXPORT_SYMBOL(max8998_bulk_read); 86 87 int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value) 88 { 89 struct max8998_dev *max8998 = i2c_get_clientdata(i2c); 90 int ret; 91 92 mutex_lock(&max8998->iolock); 93 ret = i2c_smbus_write_byte_data(i2c, reg, value); 94 mutex_unlock(&max8998->iolock); 95 return ret; 96 } 97 EXPORT_SYMBOL(max8998_write_reg); 98 99 int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf) 100 { 101 struct max8998_dev *max8998 = i2c_get_clientdata(i2c); 102 int ret; 103 104 mutex_lock(&max8998->iolock); 105 ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf); 106 mutex_unlock(&max8998->iolock); 107 if (ret < 0) 108 return ret; 109 110 return 0; 111 } 112 EXPORT_SYMBOL(max8998_bulk_write); 113 114 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask) 115 { 116 struct max8998_dev *max8998 = i2c_get_clientdata(i2c); 117 int ret; 118 119 mutex_lock(&max8998->iolock); 120 ret = i2c_smbus_read_byte_data(i2c, reg); 121 if (ret >= 0) { 122 u8 old_val = ret & 0xff; 123 u8 new_val = (val & mask) | (old_val & (~mask)); 124 ret = i2c_smbus_write_byte_data(i2c, reg, new_val); 125 } 126 mutex_unlock(&max8998->iolock); 127 return ret; 128 } 129 EXPORT_SYMBOL(max8998_update_reg); 130 131 static int max8998_i2c_probe(struct i2c_client *i2c, 132 const struct i2c_device_id *id) 133 { 134 struct max8998_platform_data *pdata = i2c->dev.platform_data; 135 struct max8998_dev *max8998; 136 int ret = 0; 137 138 max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL); 139 if (max8998 == NULL) 140 return -ENOMEM; 141 142 i2c_set_clientdata(i2c, max8998); 143 max8998->dev = &i2c->dev; 144 max8998->i2c = i2c; 145 max8998->irq = i2c->irq; 146 max8998->type = id->driver_data; 147 if (pdata) { 148 max8998->ono = pdata->ono; 149 max8998->irq_base = pdata->irq_base; 150 max8998->wakeup = pdata->wakeup; 151 } 152 mutex_init(&max8998->iolock); 153 154 max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR); 155 i2c_set_clientdata(max8998->rtc, max8998); 156 157 max8998_irq_init(max8998); 158 159 pm_runtime_set_active(max8998->dev); 160 161 switch (id->driver_data) { 162 case TYPE_LP3974: 163 ret = mfd_add_devices(max8998->dev, -1, 164 lp3974_devs, ARRAY_SIZE(lp3974_devs), 165 NULL, 0); 166 break; 167 case TYPE_MAX8998: 168 ret = mfd_add_devices(max8998->dev, -1, 169 max8998_devs, ARRAY_SIZE(max8998_devs), 170 NULL, 0); 171 break; 172 default: 173 ret = -EINVAL; 174 } 175 176 if (ret < 0) 177 goto err; 178 179 device_init_wakeup(max8998->dev, max8998->wakeup); 180 181 return ret; 182 183 err: 184 mfd_remove_devices(max8998->dev); 185 max8998_irq_exit(max8998); 186 i2c_unregister_device(max8998->rtc); 187 kfree(max8998); 188 return ret; 189 } 190 191 static int max8998_i2c_remove(struct i2c_client *i2c) 192 { 193 struct max8998_dev *max8998 = i2c_get_clientdata(i2c); 194 195 mfd_remove_devices(max8998->dev); 196 max8998_irq_exit(max8998); 197 i2c_unregister_device(max8998->rtc); 198 kfree(max8998); 199 200 return 0; 201 } 202 203 static const struct i2c_device_id max8998_i2c_id[] = { 204 { "max8998", TYPE_MAX8998 }, 205 { "lp3974", TYPE_LP3974}, 206 { } 207 }; 208 MODULE_DEVICE_TABLE(i2c, max8998_i2c_id); 209 210 static int max8998_suspend(struct device *dev) 211 { 212 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 213 struct max8998_dev *max8998 = i2c_get_clientdata(i2c); 214 215 if (device_may_wakeup(dev)) 216 irq_set_irq_wake(max8998->irq, 1); 217 return 0; 218 } 219 220 static int max8998_resume(struct device *dev) 221 { 222 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 223 struct max8998_dev *max8998 = i2c_get_clientdata(i2c); 224 225 if (device_may_wakeup(dev)) 226 irq_set_irq_wake(max8998->irq, 0); 227 /* 228 * In LP3974, if IRQ registers are not "read & clear" 229 * when it's set during sleep, the interrupt becomes 230 * disabled. 231 */ 232 return max8998_irq_resume(i2c_get_clientdata(i2c)); 233 } 234 235 struct max8998_reg_dump { 236 u8 addr; 237 u8 val; 238 }; 239 #define SAVE_ITEM(x) { .addr = (x), .val = 0x0, } 240 static struct max8998_reg_dump max8998_dump[] = { 241 SAVE_ITEM(MAX8998_REG_IRQM1), 242 SAVE_ITEM(MAX8998_REG_IRQM2), 243 SAVE_ITEM(MAX8998_REG_IRQM3), 244 SAVE_ITEM(MAX8998_REG_IRQM4), 245 SAVE_ITEM(MAX8998_REG_STATUSM1), 246 SAVE_ITEM(MAX8998_REG_STATUSM2), 247 SAVE_ITEM(MAX8998_REG_CHGR1), 248 SAVE_ITEM(MAX8998_REG_CHGR2), 249 SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1), 250 SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1), 251 SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3), 252 SAVE_ITEM(MAX8998_REG_ONOFF1), 253 SAVE_ITEM(MAX8998_REG_ONOFF2), 254 SAVE_ITEM(MAX8998_REG_ONOFF3), 255 SAVE_ITEM(MAX8998_REG_ONOFF4), 256 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1), 257 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2), 258 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3), 259 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4), 260 SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1), 261 SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2), 262 SAVE_ITEM(MAX8998_REG_LDO2_LDO3), 263 SAVE_ITEM(MAX8998_REG_LDO4), 264 SAVE_ITEM(MAX8998_REG_LDO5), 265 SAVE_ITEM(MAX8998_REG_LDO6), 266 SAVE_ITEM(MAX8998_REG_LDO7), 267 SAVE_ITEM(MAX8998_REG_LDO8_LDO9), 268 SAVE_ITEM(MAX8998_REG_LDO10_LDO11), 269 SAVE_ITEM(MAX8998_REG_LDO12), 270 SAVE_ITEM(MAX8998_REG_LDO13), 271 SAVE_ITEM(MAX8998_REG_LDO14), 272 SAVE_ITEM(MAX8998_REG_LDO15), 273 SAVE_ITEM(MAX8998_REG_LDO16), 274 SAVE_ITEM(MAX8998_REG_LDO17), 275 SAVE_ITEM(MAX8998_REG_BKCHR), 276 SAVE_ITEM(MAX8998_REG_LBCNFG1), 277 SAVE_ITEM(MAX8998_REG_LBCNFG2), 278 }; 279 /* Save registers before hibernation */ 280 static int max8998_freeze(struct device *dev) 281 { 282 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 283 int i; 284 285 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++) 286 max8998_read_reg(i2c, max8998_dump[i].addr, 287 &max8998_dump[i].val); 288 289 return 0; 290 } 291 292 /* Restore registers after hibernation */ 293 static int max8998_restore(struct device *dev) 294 { 295 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 296 int i; 297 298 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++) 299 max8998_write_reg(i2c, max8998_dump[i].addr, 300 max8998_dump[i].val); 301 302 return 0; 303 } 304 305 static const struct dev_pm_ops max8998_pm = { 306 .suspend = max8998_suspend, 307 .resume = max8998_resume, 308 .freeze = max8998_freeze, 309 .restore = max8998_restore, 310 }; 311 312 static struct i2c_driver max8998_i2c_driver = { 313 .driver = { 314 .name = "max8998", 315 .owner = THIS_MODULE, 316 .pm = &max8998_pm, 317 }, 318 .probe = max8998_i2c_probe, 319 .remove = max8998_i2c_remove, 320 .id_table = max8998_i2c_id, 321 }; 322 323 static int __init max8998_i2c_init(void) 324 { 325 return i2c_add_driver(&max8998_i2c_driver); 326 } 327 /* init early so consumer devices can complete system boot */ 328 subsys_initcall(max8998_i2c_init); 329 330 static void __exit max8998_i2c_exit(void) 331 { 332 i2c_del_driver(&max8998_i2c_driver); 333 } 334 module_exit(max8998_i2c_exit); 335 336 MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver"); 337 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>"); 338 MODULE_LICENSE("GPL"); 339