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authorMyungJoo Ham <myungjoo.ham@samsung.com>2010-12-23 03:53:36 -0500
committerSamuel Ortiz <sameo@linux.intel.com>2011-01-14 06:38:14 -0500
commitcdd137c9c86c201ddb7f42ec978d2da45e7b7a17 (patch)
tree1fe9850f283a3952b139d2fc113759fbb4fed88c /drivers/mfd/max8998.c
parent6680d940b80dbb0617226c5b76b071a3977feb1c (diff)
mfd: MAX8998/LP3974 hibernation support
This patch makes the driver to save and restore register values for hibernation. Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/max8998.c')
-rw-r--r--drivers/mfd/max8998.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c
index bb9977bebe78..5ce00ad5241a 100644
--- a/drivers/mfd/max8998.c
+++ b/drivers/mfd/max8998.c
@@ -25,6 +25,8 @@
25#include <linux/init.h> 25#include <linux/init.h>
26#include <linux/slab.h> 26#include <linux/slab.h>
27#include <linux/i2c.h> 27#include <linux/i2c.h>
28#include <linux/interrupt.h>
29#include <linux/pm_runtime.h>
28#include <linux/mutex.h> 30#include <linux/mutex.h>
29#include <linux/mfd/core.h> 31#include <linux/mfd/core.h>
30#include <linux/mfd/max8998.h> 32#include <linux/mfd/max8998.h>
@@ -135,6 +137,7 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
135 if (pdata) { 137 if (pdata) {
136 max8998->ono = pdata->ono; 138 max8998->ono = pdata->ono;
137 max8998->irq_base = pdata->irq_base; 139 max8998->irq_base = pdata->irq_base;
140 max8998->wakeup = pdata->wakeup;
138 } 141 }
139 mutex_init(&max8998->iolock); 142 mutex_init(&max8998->iolock);
140 143
@@ -146,6 +149,8 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
146 ret = mfd_add_devices(max8998->dev, -1, 149 ret = mfd_add_devices(max8998->dev, -1,
147 max8998_devs, ARRAY_SIZE(max8998_devs), 150 max8998_devs, ARRAY_SIZE(max8998_devs),
148 NULL, 0); 151 NULL, 0);
152 pm_runtime_set_active(max8998->dev);
153
149 if (ret < 0) 154 if (ret < 0)
150 goto err; 155 goto err;
151 156
@@ -178,10 +183,113 @@ static const struct i2c_device_id max8998_i2c_id[] = {
178}; 183};
179MODULE_DEVICE_TABLE(i2c, max8998_i2c_id); 184MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
180 185
186static int max8998_suspend(struct device *dev)
187{
188 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
189 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
190
191 if (max8998->wakeup)
192 set_irq_wake(max8998->irq, 1);
193 return 0;
194}
195
196static int max8998_resume(struct device *dev)
197{
198 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
199 struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
200
201 if (max8998->wakeup)
202 set_irq_wake(max8998->irq, 0);
203 /*
204 * In LP3974, if IRQ registers are not "read & clear"
205 * when it's set during sleep, the interrupt becomes
206 * disabled.
207 */
208 return max8998_irq_resume(i2c_get_clientdata(i2c));
209}
210
211struct max8998_reg_dump {
212 u8 addr;
213 u8 val;
214};
215#define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
216struct max8998_reg_dump max8998_dump[] = {
217 SAVE_ITEM(MAX8998_REG_IRQM1),
218 SAVE_ITEM(MAX8998_REG_IRQM2),
219 SAVE_ITEM(MAX8998_REG_IRQM3),
220 SAVE_ITEM(MAX8998_REG_IRQM4),
221 SAVE_ITEM(MAX8998_REG_STATUSM1),
222 SAVE_ITEM(MAX8998_REG_STATUSM2),
223 SAVE_ITEM(MAX8998_REG_CHGR1),
224 SAVE_ITEM(MAX8998_REG_CHGR2),
225 SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
226 SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
227 SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
228 SAVE_ITEM(MAX8998_REG_ONOFF1),
229 SAVE_ITEM(MAX8998_REG_ONOFF2),
230 SAVE_ITEM(MAX8998_REG_ONOFF3),
231 SAVE_ITEM(MAX8998_REG_ONOFF4),
232 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
233 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
234 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
235 SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
236 SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
237 SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
238 SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
239 SAVE_ITEM(MAX8998_REG_LDO4),
240 SAVE_ITEM(MAX8998_REG_LDO5),
241 SAVE_ITEM(MAX8998_REG_LDO6),
242 SAVE_ITEM(MAX8998_REG_LDO7),
243 SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
244 SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
245 SAVE_ITEM(MAX8998_REG_LDO12),
246 SAVE_ITEM(MAX8998_REG_LDO13),
247 SAVE_ITEM(MAX8998_REG_LDO14),
248 SAVE_ITEM(MAX8998_REG_LDO15),
249 SAVE_ITEM(MAX8998_REG_LDO16),
250 SAVE_ITEM(MAX8998_REG_LDO17),
251 SAVE_ITEM(MAX8998_REG_BKCHR),
252 SAVE_ITEM(MAX8998_REG_LBCNFG1),
253 SAVE_ITEM(MAX8998_REG_LBCNFG2),
254};
255/* Save registers before hibernation */
256static int max8998_freeze(struct device *dev)
257{
258 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
259 int i;
260
261 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
262 max8998_read_reg(i2c, max8998_dump[i].addr,
263 &max8998_dump[i].val);
264
265 return 0;
266}
267
268/* Restore registers after hibernation */
269static int max8998_restore(struct device *dev)
270{
271 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
272 int i;
273
274 for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
275 max8998_write_reg(i2c, max8998_dump[i].addr,
276 max8998_dump[i].val);
277
278 return 0;
279}
280
281const struct dev_pm_ops max8998_pm = {
282 .suspend = max8998_suspend,
283 .resume = max8998_resume,
284 .freeze = max8998_freeze,
285 .restore = max8998_restore,
286};
287
181static struct i2c_driver max8998_i2c_driver = { 288static struct i2c_driver max8998_i2c_driver = {
182 .driver = { 289 .driver = {
183 .name = "max8998", 290 .name = "max8998",
184 .owner = THIS_MODULE, 291 .owner = THIS_MODULE,
292 .pm = &max8998_pm,
185 }, 293 },
186 .probe = max8998_i2c_probe, 294 .probe = max8998_i2c_probe,
187 .remove = max8998_i2c_remove, 295 .remove = max8998_i2c_remove,