2 * max8998.c - mfd core driver for the Maxim 8998
4 * Copyright (C) 2009-2010 Samsung Electronics
5 * Kyungmin Park <kyungmin.park@samsung.com>
6 * Marek Szyprowski <m.szyprowski@samsung.com>
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.
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.
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
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>
35 #define RTC_I2C_ADDR (0x0c >> 1)
37 static struct mfd_cell max8998_devs[] = {
39 .name = "max8998-pmic",
41 .name = "max8998-rtc",
43 .name = "max8998-battery",
47 static struct mfd_cell lp3974_devs[] = {
49 .name = "lp3974-pmic",
55 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
57 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
60 mutex_lock(&max8998->iolock);
61 ret = i2c_smbus_read_byte_data(i2c, reg);
62 mutex_unlock(&max8998->iolock);
70 EXPORT_SYMBOL(max8998_read_reg);
72 int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
74 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
77 mutex_lock(&max8998->iolock);
78 ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
79 mutex_unlock(&max8998->iolock);
85 EXPORT_SYMBOL(max8998_bulk_read);
87 int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
89 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
92 mutex_lock(&max8998->iolock);
93 ret = i2c_smbus_write_byte_data(i2c, reg, value);
94 mutex_unlock(&max8998->iolock);
97 EXPORT_SYMBOL(max8998_write_reg);
99 int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
101 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
104 mutex_lock(&max8998->iolock);
105 ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
106 mutex_unlock(&max8998->iolock);
112 EXPORT_SYMBOL(max8998_bulk_write);
114 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
116 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
119 mutex_lock(&max8998->iolock);
120 ret = i2c_smbus_read_byte_data(i2c, reg);
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);
126 mutex_unlock(&max8998->iolock);
129 EXPORT_SYMBOL(max8998_update_reg);
131 static int max8998_i2c_probe(struct i2c_client *i2c,
132 const struct i2c_device_id *id)
134 struct max8998_platform_data *pdata = i2c->dev.platform_data;
135 struct max8998_dev *max8998;
138 max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
142 i2c_set_clientdata(i2c, max8998);
143 max8998->dev = &i2c->dev;
145 max8998->irq = i2c->irq;
146 max8998->type = id->driver_data;
148 max8998->ono = pdata->ono;
149 max8998->irq_base = pdata->irq_base;
150 max8998->wakeup = pdata->wakeup;
152 mutex_init(&max8998->iolock);
154 max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
155 i2c_set_clientdata(max8998->rtc, max8998);
157 max8998_irq_init(max8998);
159 pm_runtime_set_active(max8998->dev);
161 switch (id->driver_data) {
163 ret = mfd_add_devices(max8998->dev, -1,
164 lp3974_devs, ARRAY_SIZE(lp3974_devs),
168 ret = mfd_add_devices(max8998->dev, -1,
169 max8998_devs, ARRAY_SIZE(max8998_devs),
182 mfd_remove_devices(max8998->dev);
183 max8998_irq_exit(max8998);
184 i2c_unregister_device(max8998->rtc);
189 static int max8998_i2c_remove(struct i2c_client *i2c)
191 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
193 mfd_remove_devices(max8998->dev);
194 max8998_irq_exit(max8998);
195 i2c_unregister_device(max8998->rtc);
201 static const struct i2c_device_id max8998_i2c_id[] = {
202 { "max8998", TYPE_MAX8998 },
203 { "lp3974", TYPE_LP3974},
206 MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
208 static int max8998_suspend(struct device *dev)
210 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
211 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
214 irq_set_irq_wake(max8998->irq, 1);
218 static int max8998_resume(struct device *dev)
220 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
221 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
224 irq_set_irq_wake(max8998->irq, 0);
226 * In LP3974, if IRQ registers are not "read & clear"
227 * when it's set during sleep, the interrupt becomes
230 return max8998_irq_resume(i2c_get_clientdata(i2c));
233 struct max8998_reg_dump {
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),
277 /* Save registers before hibernation */
278 static int max8998_freeze(struct device *dev)
280 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
283 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
284 max8998_read_reg(i2c, max8998_dump[i].addr,
285 &max8998_dump[i].val);
290 /* Restore registers after hibernation */
291 static int max8998_restore(struct device *dev)
293 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
296 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
297 max8998_write_reg(i2c, max8998_dump[i].addr,
298 max8998_dump[i].val);
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,
310 static struct i2c_driver max8998_i2c_driver = {
313 .owner = THIS_MODULE,
316 .probe = max8998_i2c_probe,
317 .remove = max8998_i2c_remove,
318 .id_table = max8998_i2c_id,
321 static int __init max8998_i2c_init(void)
323 return i2c_add_driver(&max8998_i2c_driver);
325 /* init early so consumer devices can complete system boot */
326 subsys_initcall(max8998_i2c_init);
328 static void __exit max8998_i2c_exit(void)
330 i2c_del_driver(&max8998_i2c_driver);
332 module_exit(max8998_i2c_exit);
334 MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
335 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
336 MODULE_LICENSE("GPL");