Merge remote-tracking branch 'cleancache/linux-next'
[linux-2.6/next.git] / drivers / mfd / max8998.c
blob9ec7570f5b8140b53bc620edbba36df37b9757b4
1 /*
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",
40 }, {
41 .name = "max8998-rtc",
45 static struct mfd_cell lp3974_devs[] = {
47 .name = "lp3974-pmic",
48 }, {
49 .name = "lp3974-rtc",
53 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
55 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
56 int ret;
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;
64 ret &= 0xff;
65 *dest = ret;
66 return 0;
68 EXPORT_SYMBOL(max8998_read_reg);
70 int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
72 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
73 int ret;
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;
81 return 0;
83 EXPORT_SYMBOL(max8998_bulk_read);
85 int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
87 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
88 int ret;
90 mutex_lock(&max8998->iolock);
91 ret = i2c_smbus_write_byte_data(i2c, reg, value);
92 mutex_unlock(&max8998->iolock);
93 return ret;
95 EXPORT_SYMBOL(max8998_write_reg);
97 int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
99 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
100 int ret;
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;
108 return 0;
110 EXPORT_SYMBOL(max8998_bulk_write);
112 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
114 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
115 int ret;
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);
124 mutex_unlock(&max8998->iolock);
125 return ret;
127 EXPORT_SYMBOL(max8998_update_reg);
129 static int max8998_i2c_probe(struct i2c_client *i2c,
130 const struct i2c_device_id *id)
132 struct max8998_platform_data *pdata = i2c->dev.platform_data;
133 struct max8998_dev *max8998;
134 int ret = 0;
136 max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
137 if (max8998 == NULL)
138 return -ENOMEM;
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;
150 mutex_init(&max8998->iolock);
152 max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
153 i2c_set_clientdata(max8998->rtc, max8998);
155 max8998_irq_init(max8998);
157 pm_runtime_set_active(max8998->dev);
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;
174 if (ret < 0)
175 goto err;
177 return ret;
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;
187 static int max8998_i2c_remove(struct i2c_client *i2c)
189 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
191 mfd_remove_devices(max8998->dev);
192 max8998_irq_exit(max8998);
193 i2c_unregister_device(max8998->rtc);
194 kfree(max8998);
196 return 0;
199 static const struct i2c_device_id max8998_i2c_id[] = {
200 { "max8998", TYPE_MAX8998 },
201 { "lp3974", TYPE_LP3974},
204 MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
206 static int max8998_suspend(struct device *dev)
208 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
209 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
211 if (max8998->wakeup)
212 irq_set_irq_wake(max8998->irq, 1);
213 return 0;
216 static int max8998_resume(struct device *dev)
218 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
219 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
221 if (max8998->wakeup)
222 irq_set_irq_wake(max8998->irq, 0);
224 * In LP3974, if IRQ registers are not "read & clear"
225 * when it's set during sleep, the interrupt becomes
226 * disabled.
228 return max8998_irq_resume(i2c_get_clientdata(i2c));
231 struct max8998_reg_dump {
232 u8 addr;
233 u8 val;
235 #define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
236 static 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),
275 /* Save registers before hibernation */
276 static int max8998_freeze(struct device *dev)
278 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
279 int i;
281 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
282 max8998_read_reg(i2c, max8998_dump[i].addr,
283 &max8998_dump[i].val);
285 return 0;
288 /* Restore registers after hibernation */
289 static int max8998_restore(struct device *dev)
291 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
292 int i;
294 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
295 max8998_write_reg(i2c, max8998_dump[i].addr,
296 max8998_dump[i].val);
298 return 0;
301 static const struct dev_pm_ops max8998_pm = {
302 .suspend = max8998_suspend,
303 .resume = max8998_resume,
304 .freeze = max8998_freeze,
305 .restore = max8998_restore,
308 static struct i2c_driver max8998_i2c_driver = {
309 .driver = {
310 .name = "max8998",
311 .owner = THIS_MODULE,
312 .pm = &max8998_pm,
314 .probe = max8998_i2c_probe,
315 .remove = max8998_i2c_remove,
316 .id_table = max8998_i2c_id,
319 static int __init max8998_i2c_init(void)
321 return i2c_add_driver(&max8998_i2c_driver);
323 /* init early so consumer devices can complete system boot */
324 subsys_initcall(max8998_i2c_init);
326 static void __exit max8998_i2c_exit(void)
328 i2c_del_driver(&max8998_i2c_driver);
330 module_exit(max8998_i2c_exit);
332 MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
333 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
334 MODULE_LICENSE("GPL");