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Kyungmin Park156f2522010-06-16 09:04:16 +02001/*
Joonyoung Shim2c7e6f52010-09-10 18:36:39 +02002 * max8998.c - mfd core driver for the Maxim 8998
Kyungmin Park156f2522010-06-16 09:04:16 +02003 *
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>
MyungJoo Hamcdd137c2010-12-23 17:53:36 +090028#include <linux/interrupt.h>
29#include <linux/pm_runtime.h>
Kyungmin Park156f2522010-06-16 09:04:16 +020030#include <linux/mutex.h>
31#include <linux/mfd/core.h>
32#include <linux/mfd/max8998.h>
33#include <linux/mfd/max8998-private.h>
34
Joonyoung Shim9b16c0a2010-08-06 11:28:08 +090035#define RTC_I2C_ADDR (0x0c >> 1)
36
Kyungmin Park156f2522010-06-16 09:04:16 +020037static struct mfd_cell max8998_devs[] = {
38 {
39 .name = "max8998-pmic",
Joonyoung Shim9b16c0a2010-08-06 11:28:08 +090040 }, {
41 .name = "max8998-rtc",
42 },
Kyungmin Park156f2522010-06-16 09:04:16 +020043};
44
MyungJoo Ham337ce5d2011-01-04 14:17:39 +090045static struct mfd_cell lp3974_devs[] = {
46 {
47 .name = "lp3974-pmic",
48 }, {
49 .name = "lp3974-rtc",
50 },
51};
52
Joonyoung Shim676e02d2010-08-06 11:28:06 +090053int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
Kyungmin Park156f2522010-06-16 09:04:16 +020054{
Joonyoung Shim676e02d2010-08-06 11:28:06 +090055 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
Kyungmin Park156f2522010-06-16 09:04:16 +020056 int ret;
57
58 mutex_lock(&max8998->iolock);
Joonyoung Shim676e02d2010-08-06 11:28:06 +090059 ret = i2c_smbus_read_byte_data(i2c, reg);
Kyungmin Park156f2522010-06-16 09:04:16 +020060 mutex_unlock(&max8998->iolock);
61 if (ret < 0)
62 return ret;
63
64 ret &= 0xff;
65 *dest = ret;
66 return 0;
67}
Joonyoung Shim676e02d2010-08-06 11:28:06 +090068EXPORT_SYMBOL(max8998_read_reg);
Kyungmin Park156f2522010-06-16 09:04:16 +020069
Joonyoung Shim2c7e6f52010-09-10 18:36:39 +020070int 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}
83EXPORT_SYMBOL(max8998_bulk_read);
84
Joonyoung Shim676e02d2010-08-06 11:28:06 +090085int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
Kyungmin Park156f2522010-06-16 09:04:16 +020086{
Joonyoung Shim676e02d2010-08-06 11:28:06 +090087 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
Kyungmin Park156f2522010-06-16 09:04:16 +020088 int ret;
89
90 mutex_lock(&max8998->iolock);
Joonyoung Shim676e02d2010-08-06 11:28:06 +090091 ret = i2c_smbus_write_byte_data(i2c, reg, value);
Kyungmin Park156f2522010-06-16 09:04:16 +020092 mutex_unlock(&max8998->iolock);
93 return ret;
94}
Joonyoung Shim676e02d2010-08-06 11:28:06 +090095EXPORT_SYMBOL(max8998_write_reg);
Kyungmin Park156f2522010-06-16 09:04:16 +020096
Joonyoung Shim9b16c0a2010-08-06 11:28:08 +090097int 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}
110EXPORT_SYMBOL(max8998_bulk_write);
111
Joonyoung Shim676e02d2010-08-06 11:28:06 +0900112int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
Kyungmin Park156f2522010-06-16 09:04:16 +0200113{
Joonyoung Shim676e02d2010-08-06 11:28:06 +0900114 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
Kyungmin Park156f2522010-06-16 09:04:16 +0200115 int ret;
116
117 mutex_lock(&max8998->iolock);
Joonyoung Shim676e02d2010-08-06 11:28:06 +0900118 ret = i2c_smbus_read_byte_data(i2c, reg);
Kyungmin Park156f2522010-06-16 09:04:16 +0200119 if (ret >= 0) {
120 u8 old_val = ret & 0xff;
121 u8 new_val = (val & mask) | (old_val & (~mask));
Joonyoung Shim676e02d2010-08-06 11:28:06 +0900122 ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
Kyungmin Park156f2522010-06-16 09:04:16 +0200123 }
124 mutex_unlock(&max8998->iolock);
125 return ret;
126}
Joonyoung Shim676e02d2010-08-06 11:28:06 +0900127EXPORT_SYMBOL(max8998_update_reg);
Kyungmin Park156f2522010-06-16 09:04:16 +0200128
129static int max8998_i2c_probe(struct i2c_client *i2c,
130 const struct i2c_device_id *id)
131{
Joonyoung Shim2c7e6f52010-09-10 18:36:39 +0200132 struct max8998_platform_data *pdata = i2c->dev.platform_data;
Kyungmin Park156f2522010-06-16 09:04:16 +0200133 struct max8998_dev *max8998;
134 int ret = 0;
135
136 max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
Axel Lin8f1f1512010-08-09 14:48:16 +0800137 if (max8998 == NULL)
Kyungmin Park156f2522010-06-16 09:04:16 +0200138 return -ENOMEM;
Kyungmin Park156f2522010-06-16 09:04:16 +0200139
140 i2c_set_clientdata(i2c, max8998);
141 max8998->dev = &i2c->dev;
Joonyoung Shim676e02d2010-08-06 11:28:06 +0900142 max8998->i2c = i2c;
Joonyoung Shim2c7e6f52010-09-10 18:36:39 +0200143 max8998->irq = i2c->irq;
Lukasz Majewski509bd472010-09-27 14:32:24 +0200144 max8998->type = id->driver_data;
Joonyoung Shim2c7e6f52010-09-10 18:36:39 +0200145 if (pdata) {
146 max8998->ono = pdata->ono;
147 max8998->irq_base = pdata->irq_base;
MyungJoo Hamcdd137c2010-12-23 17:53:36 +0900148 max8998->wakeup = pdata->wakeup;
Joonyoung Shim2c7e6f52010-09-10 18:36:39 +0200149 }
Kyungmin Park156f2522010-06-16 09:04:16 +0200150 mutex_init(&max8998->iolock);
151
Joonyoung Shim9b16c0a2010-08-06 11:28:08 +0900152 max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
153 i2c_set_clientdata(max8998->rtc, max8998);
154
Joonyoung Shim2c7e6f52010-09-10 18:36:39 +0200155 max8998_irq_init(max8998);
156
MyungJoo Hamcdd137c2010-12-23 17:53:36 +0900157 pm_runtime_set_active(max8998->dev);
158
MyungJoo Ham337ce5d2011-01-04 14:17:39 +0900159 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
Kyungmin Park156f2522010-06-16 09:04:16 +0200174 if (ret < 0)
175 goto err;
176
177 return ret;
178
179err:
180 mfd_remove_devices(max8998->dev);
Axel Lin74845522010-10-22 08:31:49 +0800181 max8998_irq_exit(max8998);
182 i2c_unregister_device(max8998->rtc);
Kyungmin Park156f2522010-06-16 09:04:16 +0200183 kfree(max8998);
184 return ret;
185}
186
187static 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);
Axel Lin74845522010-10-22 08:31:49 +0800192 max8998_irq_exit(max8998);
193 i2c_unregister_device(max8998->rtc);
Kyungmin Park156f2522010-06-16 09:04:16 +0200194 kfree(max8998);
195
196 return 0;
197}
198
199static const struct i2c_device_id max8998_i2c_id[] = {
Lukasz Majewski509bd472010-09-27 14:32:24 +0200200 { "max8998", TYPE_MAX8998 },
201 { "lp3974", TYPE_LP3974},
Kyungmin Parkf8539dd2010-08-23 13:46:49 +0900202 { }
Kyungmin Park156f2522010-06-16 09:04:16 +0200203};
204MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
205
MyungJoo Hamcdd137c2010-12-23 17:53:36 +0900206static 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
216static 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
231struct max8998_reg_dump {
232 u8 addr;
233 u8 val;
234};
235#define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
236struct 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 */
276static 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 */
289static 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
301const struct dev_pm_ops max8998_pm = {
302 .suspend = max8998_suspend,
303 .resume = max8998_resume,
304 .freeze = max8998_freeze,
305 .restore = max8998_restore,
306};
307
Kyungmin Park156f2522010-06-16 09:04:16 +0200308static struct i2c_driver max8998_i2c_driver = {
309 .driver = {
310 .name = "max8998",
311 .owner = THIS_MODULE,
MyungJoo Hamcdd137c2010-12-23 17:53:36 +0900312 .pm = &max8998_pm,
Kyungmin Park156f2522010-06-16 09:04:16 +0200313 },
314 .probe = max8998_i2c_probe,
315 .remove = max8998_i2c_remove,
316 .id_table = max8998_i2c_id,
317};
318
319static 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 */
324subsys_initcall(max8998_i2c_init);
325
326static void __exit max8998_i2c_exit(void)
327{
328 i2c_del_driver(&max8998_i2c_driver);
329}
330module_exit(max8998_i2c_exit);
331
332MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
333MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
334MODULE_LICENSE("GPL");