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 return ret; 180 181 err: 182 mfd_remove_devices(max8998->dev); 183 max8998_irq_exit(max8998); 184 i2c_unregister_device(max8998->rtc); 185 kfree(max8998); 186 return ret; 187 } 188 189 static int max8998_i2c_remove(struct i2c_client *i2c) 190 { 191 struct max8998_dev *max8998 = i2c_get_clientdata(i2c); 192 193 mfd_remove_devices(max8998->dev); 194 max8998_irq_exit(max8998); 195 i2c_unregister_device(max8998->rtc); 196 kfree(max8998); 197 198 return 0; 199 } 200 201 static const struct i2c_device_id max8998_i2c_id[] = { 202 { "max8998", TYPE_MAX8998 }, 203 { "lp3974", TYPE_LP3974}, 204 { } 205 }; 206 MODULE_DEVICE_TABLE(i2c, max8998_i2c_id); 207 208 static int max8998_suspend(struct device *dev) 209 { 210 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 211 struct max8998_dev *max8998 = i2c_get_clientdata(i2c); 212 213 if (max8998->wakeup) 214 irq_set_irq_wake(max8998->irq, 1); 215 return 0; 216 } 217 218 static int max8998_resume(struct device *dev) 219 { 220 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 221 struct max8998_dev *max8998 = i2c_get_clientdata(i2c); 222 223 if (max8998->wakeup) 224 irq_set_irq_wake(max8998->irq, 0); 225 /* 226 * In LP3974, if IRQ registers are not "read & clear" 227 * when it's set during sleep, the interrupt becomes 228 * disabled. 229 */ 230 return max8998_irq_resume(i2c_get_clientdata(i2c)); 231 } 232 233 struct max8998_reg_dump { 234 u8 addr; 235 u8 val; 236 }; 237 #define SAVE_ITEM(x) { .addr = (x), .val = 0x0, } 238 static struct max8998_reg_dump max8998_dump[] = { 239 SAVE_ITEM(MAX8998_REG_IRQM1), 240 SAVE_ITEM(MAX8998_REG_IRQM2), 241 SAVE_ITEM(MAX8998_REG_IRQM3), 242 SAVE_ITEM(MAX8998_REG_IRQM4), 243 SAVE_ITEM(MAX8998_REG_STATUSM1), 244 SAVE_ITEM(MAX8998_REG_STATUSM2), 245 SAVE_ITEM(MAX8998_REG_CHGR1), 246 SAVE_ITEM(MAX8998_REG_CHGR2), 247 SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1), 248 SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1), 249 SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3), 250 SAVE_ITEM(MAX8998_REG_ONOFF1), 251 SAVE_ITEM(MAX8998_REG_ONOFF2), 252 SAVE_ITEM(MAX8998_REG_ONOFF3), 253 SAVE_ITEM(MAX8998_REG_ONOFF4), 254 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1), 255 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2), 256 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3), 257 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4), 258 SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1), 259 SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2), 260 SAVE_ITEM(MAX8998_REG_LDO2_LDO3), 261 SAVE_ITEM(MAX8998_REG_LDO4), 262 SAVE_ITEM(MAX8998_REG_LDO5), 263 SAVE_ITEM(MAX8998_REG_LDO6), 264 SAVE_ITEM(MAX8998_REG_LDO7), 265 SAVE_ITEM(MAX8998_REG_LDO8_LDO9), 266 SAVE_ITEM(MAX8998_REG_LDO10_LDO11), 267 SAVE_ITEM(MAX8998_REG_LDO12), 268 SAVE_ITEM(MAX8998_REG_LDO13), 269 SAVE_ITEM(MAX8998_REG_LDO14), 270 SAVE_ITEM(MAX8998_REG_LDO15), 271 SAVE_ITEM(MAX8998_REG_LDO16), 272 SAVE_ITEM(MAX8998_REG_LDO17), 273 SAVE_ITEM(MAX8998_REG_BKCHR), 274 SAVE_ITEM(MAX8998_REG_LBCNFG1), 275 SAVE_ITEM(MAX8998_REG_LBCNFG2), 276 }; 277 /* Save registers before hibernation */ 278 static int max8998_freeze(struct device *dev) 279 { 280 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 281 int i; 282 283 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++) 284 max8998_read_reg(i2c, max8998_dump[i].addr, 285 &max8998_dump[i].val); 286 287 return 0; 288 } 289 290 /* Restore registers after hibernation */ 291 static int max8998_restore(struct device *dev) 292 { 293 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 294 int i; 295 296 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++) 297 max8998_write_reg(i2c, max8998_dump[i].addr, 298 max8998_dump[i].val); 299 300 return 0; 301 } 302 303 static const struct dev_pm_ops max8998_pm = { 304 .suspend = max8998_suspend, 305 .resume = max8998_resume, 306 .freeze = max8998_freeze, 307 .restore = max8998_restore, 308 }; 309 310 static struct i2c_driver max8998_i2c_driver = { 311 .driver = { 312 .name = "max8998", 313 .owner = THIS_MODULE, 314 .pm = &max8998_pm, 315 }, 316 .probe = max8998_i2c_probe, 317 .remove = max8998_i2c_remove, 318 .id_table = max8998_i2c_id, 319 }; 320 321 static int __init max8998_i2c_init(void) 322 { 323 return i2c_add_driver(&max8998_i2c_driver); 324 } 325 /* init early so consumer devices can complete system boot */ 326 subsys_initcall(max8998_i2c_init); 327 328 static void __exit max8998_i2c_exit(void) 329 { 330 i2c_del_driver(&max8998_i2c_driver); 331 } 332 module_exit(max8998_i2c_exit); 333 334 MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver"); 335 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>"); 336 MODULE_LICENSE("GPL"); 337