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