tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
authored by
MyungJoo Ham
and committed by
Samuel Ortiz
cdd137c9
6680d940
+118
+7
drivers/mfd/max8998-irq.c
+7
drivers/mfd/max8998-irq.c
···
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return IRQ_HANDLED;
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}
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+
int max8998_irq_resume(struct max8998_dev *max8998)
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{
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if (max8998->irq && max8998->irq_base)
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max8998_irq_thread(max8998->irq_base, max8998);
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return 0;
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}
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+
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int max8998_irq_init(struct max8998_dev *max8998)
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{
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int i;
+108
drivers/mfd/max8998.c
+108
drivers/mfd/max8998.c
···
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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+
#include <linux/interrupt.h>
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#include <linux/pm_runtime.h>
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#include <linux/mutex.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/max8998.h>
···
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if (pdata) {
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max8998->ono = pdata->ono;
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max8998->irq_base = pdata->irq_base;
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max8998->wakeup = pdata->wakeup;
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}
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mutex_init(&max8998->iolock);
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···
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ret = mfd_add_devices(max8998->dev, -1,
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max8998_devs, ARRAY_SIZE(max8998_devs),
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NULL, 0);
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pm_runtime_set_active(max8998->dev);
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+
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if (ret < 0)
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goto err;
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···
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};
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MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
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static int max8998_suspend(struct device *dev)
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{
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struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
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struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
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+
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if (max8998->wakeup)
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set_irq_wake(max8998->irq, 1);
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return 0;
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}
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+
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static int max8998_resume(struct device *dev)
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{
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struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
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struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
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+
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if (max8998->wakeup)
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set_irq_wake(max8998->irq, 0);
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/*
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* In LP3974, if IRQ registers are not "read & clear"
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* when it's set during sleep, the interrupt becomes
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* disabled.
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*/
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return max8998_irq_resume(i2c_get_clientdata(i2c));
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}
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+
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struct max8998_reg_dump {
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u8 addr;
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u8 val;
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};
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#define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
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struct max8998_reg_dump max8998_dump[] = {
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SAVE_ITEM(MAX8998_REG_IRQM1),
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SAVE_ITEM(MAX8998_REG_IRQM2),
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SAVE_ITEM(MAX8998_REG_IRQM3),
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SAVE_ITEM(MAX8998_REG_IRQM4),
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SAVE_ITEM(MAX8998_REG_STATUSM1),
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SAVE_ITEM(MAX8998_REG_STATUSM2),
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SAVE_ITEM(MAX8998_REG_CHGR1),
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SAVE_ITEM(MAX8998_REG_CHGR2),
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SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
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SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
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SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
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SAVE_ITEM(MAX8998_REG_ONOFF1),
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SAVE_ITEM(MAX8998_REG_ONOFF2),
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SAVE_ITEM(MAX8998_REG_ONOFF3),
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SAVE_ITEM(MAX8998_REG_ONOFF4),
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SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
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SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
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SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
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SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
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SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
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SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
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SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
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SAVE_ITEM(MAX8998_REG_LDO4),
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SAVE_ITEM(MAX8998_REG_LDO5),
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SAVE_ITEM(MAX8998_REG_LDO6),
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SAVE_ITEM(MAX8998_REG_LDO7),
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SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
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SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
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SAVE_ITEM(MAX8998_REG_LDO12),
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SAVE_ITEM(MAX8998_REG_LDO13),
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SAVE_ITEM(MAX8998_REG_LDO14),
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SAVE_ITEM(MAX8998_REG_LDO15),
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SAVE_ITEM(MAX8998_REG_LDO16),
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SAVE_ITEM(MAX8998_REG_LDO17),
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SAVE_ITEM(MAX8998_REG_BKCHR),
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SAVE_ITEM(MAX8998_REG_LBCNFG1),
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SAVE_ITEM(MAX8998_REG_LBCNFG2),
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};
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/* Save registers before hibernation */
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static int max8998_freeze(struct device *dev)
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{
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struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
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int i;
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+
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for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
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max8998_read_reg(i2c, max8998_dump[i].addr,
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&max8998_dump[i].val);
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return 0;
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}
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/* Restore registers after hibernation */
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static int max8998_restore(struct device *dev)
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{
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struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
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int i;
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+
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for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
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max8998_write_reg(i2c, max8998_dump[i].addr,
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max8998_dump[i].val);
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return 0;
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}
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const struct dev_pm_ops max8998_pm = {
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.suspend = max8998_suspend,
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.resume = max8998_resume,
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.freeze = max8998_freeze,
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.restore = max8998_restore,
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};
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+
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static struct i2c_driver max8998_i2c_driver = {
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.driver = {
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.name = "max8998",
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.owner = THIS_MODULE,
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.pm = &max8998_pm,
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},
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.probe = max8998_i2c_probe,
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.remove = max8998_i2c_remove,
+2
include/linux/mfd/max8998-private.h
+2
include/linux/mfd/max8998-private.h
···
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u8 irq_masks_cur[MAX8998_NUM_IRQ_REGS];
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u8 irq_masks_cache[MAX8998_NUM_IRQ_REGS];
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int type;
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bool wakeup;
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};
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int max8998_irq_init(struct max8998_dev *max8998);
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void max8998_irq_exit(struct max8998_dev *max8998);
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+
int max8998_irq_resume(struct max8998_dev *max8998);
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extern int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest);
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extern int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count,