From cdd137c9c86c201ddb7f42ec978d2da45e7b7a17 Mon Sep 17 00:00:00 2001 From: MyungJoo Ham Date: Thu, 23 Dec 2010 17:53:36 +0900 Subject: mfd: MAX8998/LP3974 hibernation support This patch makes the driver to save and restore register values for hibernation. Signed-off-by: MyungJoo Ham Signed-off-by: Kyungmin Park Signed-off-by: Samuel Ortiz --- drivers/mfd/max8998.c | 108 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) (limited to 'drivers/mfd/max8998.c') 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 @@ #include #include #include +#include +#include #include #include #include @@ -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, -- cgit v1.2.1