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    Subject[PATCH v3 1/4] MFD MAX8998/LP3974: Support Hibernation
    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>
    ---
    drivers/mfd/max8998-irq.c | 7 ++
    drivers/mfd/max8998.c | 108 +++++++++++++++++++++++++++++++++++
    include/linux/mfd/max8998-private.h | 2 +
    include/linux/mfd/max8998.h | 1 +
    4 files changed, 118 insertions(+), 0 deletions(-)

    diff --git a/drivers/mfd/max8998-irq.c b/drivers/mfd/max8998-irq.c
    index 45bfe77..93c621d 100644
    --- a/drivers/mfd/max8998-irq.c
    +++ b/drivers/mfd/max8998-irq.c
    @@ -181,6 +181,13 @@ static irqreturn_t max8998_irq_thread(int irq, void *data)
    return IRQ_HANDLED;
    }

    +int max8998_irq_resume(struct max8998_dev *max8998)
    +{
    + if (max8998->irq && max8998->irq_base)
    + max8998_irq_thread(max8998->irq_base, max8998);
    + return 0;
    +}
    +
    int max8998_irq_init(struct max8998_dev *max8998)
    {
    int i;
    diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c
    index bb9977b..5ce00ad 100644
    --- a/drivers/mfd/max8998.c
    +++ b/drivers/mfd/max8998.c
    @@ -25,6 +25,8 @@
    #include <linux/init.h>
    #include <linux/slab.h>
    #include <linux/i2c.h>
    +#include <linux/interrupt.h>
    +#include <linux/pm_runtime.h>
    #include <linux/mutex.h>
    #include <linux/mfd/core.h>
    #include <linux/mfd/max8998.h>
    @@ -135,6 +137,7 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
    if (pdata) {
    max8998->ono = pdata->ono;
    max8998->irq_base = pdata->irq_base;
    + max8998->wakeup = pdata->wakeup;
    }
    mutex_init(&max8998->iolock);

    @@ -146,6 +149,8 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
    ret = mfd_add_devices(max8998->dev, -1,
    max8998_devs, ARRAY_SIZE(max8998_devs),
    NULL, 0);
    + pm_runtime_set_active(max8998->dev);
    +
    if (ret < 0)
    goto err;

    @@ -178,10 +183,113 @@ static const struct i2c_device_id max8998_i2c_id[] = {
    };
    MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);

    +static int max8998_suspend(struct device *dev)
    +{
    + struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
    + struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
    +
    + if (max8998->wakeup)
    + set_irq_wake(max8998->irq, 1);
    + return 0;
    +}
    +
    +static int max8998_resume(struct device *dev)
    +{
    + struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
    + struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
    +
    + if (max8998->wakeup)
    + set_irq_wake(max8998->irq, 0);
    + /*
    + * In LP3974, if IRQ registers are not "read & clear"
    + * when it's set during sleep, the interrupt becomes
    + * disabled.
    + */
    + return max8998_irq_resume(i2c_get_clientdata(i2c));
    +}
    +
    +struct max8998_reg_dump {
    + u8 addr;
    + u8 val;
    +};
    +#define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
    +struct max8998_reg_dump max8998_dump[] = {
    + SAVE_ITEM(MAX8998_REG_IRQM1),
    + SAVE_ITEM(MAX8998_REG_IRQM2),
    + SAVE_ITEM(MAX8998_REG_IRQM3),
    + SAVE_ITEM(MAX8998_REG_IRQM4),
    + SAVE_ITEM(MAX8998_REG_STATUSM1),
    + SAVE_ITEM(MAX8998_REG_STATUSM2),
    + SAVE_ITEM(MAX8998_REG_CHGR1),
    + SAVE_ITEM(MAX8998_REG_CHGR2),
    + SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
    + SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
    + SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
    + SAVE_ITEM(MAX8998_REG_ONOFF1),
    + SAVE_ITEM(MAX8998_REG_ONOFF2),
    + SAVE_ITEM(MAX8998_REG_ONOFF3),
    + SAVE_ITEM(MAX8998_REG_ONOFF4),
    + SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
    + SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
    + SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
    + SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
    + SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
    + SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
    + SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
    + SAVE_ITEM(MAX8998_REG_LDO4),
    + SAVE_ITEM(MAX8998_REG_LDO5),
    + SAVE_ITEM(MAX8998_REG_LDO6),
    + SAVE_ITEM(MAX8998_REG_LDO7),
    + SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
    + SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
    + SAVE_ITEM(MAX8998_REG_LDO12),
    + SAVE_ITEM(MAX8998_REG_LDO13),
    + SAVE_ITEM(MAX8998_REG_LDO14),
    + SAVE_ITEM(MAX8998_REG_LDO15),
    + SAVE_ITEM(MAX8998_REG_LDO16),
    + SAVE_ITEM(MAX8998_REG_LDO17),
    + SAVE_ITEM(MAX8998_REG_BKCHR),
    + SAVE_ITEM(MAX8998_REG_LBCNFG1),
    + SAVE_ITEM(MAX8998_REG_LBCNFG2),
    +};
    +/* Save registers before hibernation */
    +static int max8998_freeze(struct device *dev)
    +{
    + struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
    + int i;
    +
    + for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
    + max8998_read_reg(i2c, max8998_dump[i].addr,
    + &max8998_dump[i].val);
    +
    + return 0;
    +}
    +
    +/* Restore registers after hibernation */
    +static int max8998_restore(struct device *dev)
    +{
    + struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
    + int i;
    +
    + for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
    + max8998_write_reg(i2c, max8998_dump[i].addr,
    + max8998_dump[i].val);
    +
    + return 0;
    +}
    +
    +const struct dev_pm_ops max8998_pm = {
    + .suspend = max8998_suspend,
    + .resume = max8998_resume,
    + .freeze = max8998_freeze,
    + .restore = max8998_restore,
    +};
    +
    static struct i2c_driver max8998_i2c_driver = {
    .driver = {
    .name = "max8998",
    .owner = THIS_MODULE,
    + .pm = &max8998_pm,
    },
    .probe = max8998_i2c_probe,
    .remove = max8998_i2c_remove,
    diff --git a/include/linux/mfd/max8998-private.h b/include/linux/mfd/max8998-private.h
    index 7363dea..effa5d3 100644
    --- a/include/linux/mfd/max8998-private.h
    +++ b/include/linux/mfd/max8998-private.h
    @@ -159,10 +159,12 @@ struct max8998_dev {
    u8 irq_masks_cur[MAX8998_NUM_IRQ_REGS];
    u8 irq_masks_cache[MAX8998_NUM_IRQ_REGS];
    int type;
    + bool wakeup;
    };

    int max8998_irq_init(struct max8998_dev *max8998);
    void max8998_irq_exit(struct max8998_dev *max8998);
    +int max8998_irq_resume(struct max8998_dev *max8998);

    extern int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest);
    extern int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count,
    diff --git a/include/linux/mfd/max8998.h b/include/linux/mfd/max8998.h
    index f8c9f88..686a744 100644
    --- a/include/linux/mfd/max8998.h
    +++ b/include/linux/mfd/max8998.h
    @@ -88,6 +88,7 @@ struct max8998_platform_data {
    int buck1_set1;
    int buck1_set2;
    int buck2_set3;
    + bool wakeup;
    };

    #endif /* __LINUX_MFD_MAX8998_H */
    --
    1.7.1


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