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 not provided / owned by Maxim Integrated Products.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/i2c.h>
30 #include <linux/interrupt.h>
31 #include <linux/pm_runtime.h>
32 #include <linux/mutex.h>
33 #include <linux/mfd/core.h>
34 #include <linux/mfd/max8998.h>
35 #include <linux/mfd/max8998-private.h>
37 #define RTC_I2C_ADDR (0x0c >> 1)
39 static struct mfd_cell max8998_devs[] = {
41 .name = "max8998-pmic",
43 .name = "max8998-rtc",
45 .name = "max8998-battery",
49 static struct mfd_cell lp3974_devs[] = {
51 .name = "lp3974-pmic",
55 .name = "lp3974-battery",
59 static struct mfd_cell lp3974_regerr_devs[] = {
61 .name = "lp3974-pmic",
63 .name = "lp3974-rtc-regerr",
65 .name = "lp3974-battery",
69 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
71 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
74 mutex_lock(&max8998->iolock);
75 ret = i2c_smbus_read_byte_data(i2c, reg);
76 mutex_unlock(&max8998->iolock);
84 EXPORT_SYMBOL(max8998_read_reg);
86 int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
88 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
91 mutex_lock(&max8998->iolock);
92 ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
93 mutex_unlock(&max8998->iolock);
99 EXPORT_SYMBOL(max8998_bulk_read);
101 int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
103 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
106 mutex_lock(&max8998->iolock);
107 ret = i2c_smbus_write_byte_data(i2c, reg, value);
108 mutex_unlock(&max8998->iolock);
111 EXPORT_SYMBOL(max8998_write_reg);
113 int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
115 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
118 mutex_lock(&max8998->iolock);
119 ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
120 mutex_unlock(&max8998->iolock);
126 EXPORT_SYMBOL(max8998_bulk_write);
128 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
130 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
133 mutex_lock(&max8998->iolock);
134 ret = i2c_smbus_read_byte_data(i2c, reg);
136 u8 old_val = ret & 0xff;
137 u8 new_val = (val & mask) | (old_val & (~mask));
138 ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
140 mutex_unlock(&max8998->iolock);
143 EXPORT_SYMBOL(max8998_update_reg);
145 static int max8998_i2c_probe(struct i2c_client *i2c,
146 const struct i2c_device_id *id)
148 struct max8998_platform_data *pdata = i2c->dev.platform_data;
149 struct max8998_dev *max8998;
152 max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
156 i2c_set_clientdata(i2c, max8998);
157 max8998->dev = &i2c->dev;
159 max8998->irq = i2c->irq;
160 max8998->type = id->driver_data;
162 max8998->ono = pdata->ono;
163 max8998->irq_base = pdata->irq_base;
164 max8998->wakeup = pdata->wakeup;
166 mutex_init(&max8998->iolock);
168 max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
169 i2c_set_clientdata(max8998->rtc, max8998);
171 max8998_irq_init(max8998);
173 pm_runtime_set_active(max8998->dev);
175 switch (id->driver_data) {
176 case TYPE_LP3974_REGERR:
177 ret = mfd_add_devices(max8998->dev, -1,
179 ARRAY_SIZE(lp3974_regerr_devs),
183 ret = mfd_add_devices(max8998->dev, -1,
184 lp3974_devs, ARRAY_SIZE(lp3974_devs),
188 ret = mfd_add_devices(max8998->dev, -1,
189 max8998_devs, ARRAY_SIZE(max8998_devs),
202 mfd_remove_devices(max8998->dev);
203 max8998_irq_exit(max8998);
204 i2c_unregister_device(max8998->rtc);
209 static int max8998_i2c_remove(struct i2c_client *i2c)
211 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
213 mfd_remove_devices(max8998->dev);
214 max8998_irq_exit(max8998);
215 i2c_unregister_device(max8998->rtc);
221 static const struct i2c_device_id max8998_i2c_id[] = {
222 { "max8998", TYPE_MAX8998 },
223 { "lp3974", TYPE_LP3974},
224 { "lp3974-regerr", TYPE_LP3974_REGERR },
227 MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
229 static int max8998_suspend(struct device *dev)
231 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
232 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
235 set_irq_wake(max8998->irq, 1);
239 static int max8998_resume(struct device *dev)
241 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
242 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
245 set_irq_wake(max8998->irq, 0);
247 * In LP3974, if IRQ registers are not "read & clear"
248 * when it's set during sleep, the interrupt becomes
251 return max8998_irq_resume(i2c_get_clientdata(i2c));
254 struct max8998_reg_dump {
258 #define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
259 struct max8998_reg_dump max8998_dump[] = {
260 SAVE_ITEM(MAX8998_REG_IRQM1),
261 SAVE_ITEM(MAX8998_REG_IRQM2),
262 SAVE_ITEM(MAX8998_REG_IRQM3),
263 SAVE_ITEM(MAX8998_REG_IRQM4),
264 SAVE_ITEM(MAX8998_REG_STATUSM1),
265 SAVE_ITEM(MAX8998_REG_STATUSM2),
266 SAVE_ITEM(MAX8998_REG_CHGR1),
267 SAVE_ITEM(MAX8998_REG_CHGR2),
268 SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
269 SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
270 SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
271 SAVE_ITEM(MAX8998_REG_ONOFF1),
272 SAVE_ITEM(MAX8998_REG_ONOFF2),
273 SAVE_ITEM(MAX8998_REG_ONOFF3),
274 SAVE_ITEM(MAX8998_REG_ONOFF4),
275 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
276 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
277 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
278 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
279 SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
280 SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
281 SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
282 SAVE_ITEM(MAX8998_REG_LDO4),
283 SAVE_ITEM(MAX8998_REG_LDO5),
284 SAVE_ITEM(MAX8998_REG_LDO6),
285 SAVE_ITEM(MAX8998_REG_LDO7),
286 SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
287 SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
288 SAVE_ITEM(MAX8998_REG_LDO12),
289 SAVE_ITEM(MAX8998_REG_LDO13),
290 SAVE_ITEM(MAX8998_REG_LDO14),
291 SAVE_ITEM(MAX8998_REG_LDO15),
292 SAVE_ITEM(MAX8998_REG_LDO16),
293 SAVE_ITEM(MAX8998_REG_LDO17),
294 SAVE_ITEM(MAX8998_REG_BKCHR),
295 SAVE_ITEM(MAX8998_REG_LBCNFG1),
296 SAVE_ITEM(MAX8998_REG_LBCNFG2),
298 /* Save registers before hibernation */
299 static int max8998_freeze(struct device *dev)
301 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
304 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
305 max8998_read_reg(i2c, max8998_dump[i].addr,
306 &max8998_dump[i].val);
311 /* Restore registers after hibernation */
312 static int max8998_restore(struct device *dev)
314 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
317 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
318 max8998_write_reg(i2c, max8998_dump[i].addr,
319 max8998_dump[i].val);
324 static const struct dev_pm_ops max8998_pm = {
325 .suspend = max8998_suspend,
326 .resume = max8998_resume,
327 .freeze = max8998_freeze,
328 .restore = max8998_restore,
331 static struct i2c_driver max8998_i2c_driver = {
334 .owner = THIS_MODULE,
337 .probe = max8998_i2c_probe,
338 .remove = max8998_i2c_remove,
339 .id_table = max8998_i2c_id,
342 static int __init max8998_i2c_init(void)
344 return i2c_add_driver(&max8998_i2c_driver);
346 /* init early so consumer devices can complete system boot */
347 subsys_initcall(max8998_i2c_init);
349 static void __exit max8998_i2c_exit(void)
351 i2c_del_driver(&max8998_i2c_driver);
353 module_exit(max8998_i2c_exit);
355 MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
356 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
357 MODULE_LICENSE("GPL");