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Commit b93c1758 authored by Anirudh Ghayal's avatar Anirudh Ghayal
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power: smb135x-charger: Add suspend/resume callbacks 



To avoid unnecessary wakeups from the SMB chip during system
suspend, only enable important interrupts while entering
into suspend.

Save and restore the intially configured IRQs in suspend
and resume respectively.

Change-Id: I295f594ce0f08f1552149a9b0f6cc40521495a49
Signed-off-by: default avatarAnirudh Ghayal <aghayal@codeaurora.org>
parent 1d69b0f5

drivers/power/smb135x-charger.c

+58 −0
Original line number Diff line number Diff line
@@ -233,6 +233,7 @@ struct smb135x_chg { 
	int				resume_delta_mv;

	struct dentry			*debug_root;

	int				usb_current_arr_size;

	u8				irq_cfg_mask[3];



	/* psy */

	struct power_supply		*usb_psy;
@@ -2382,6 +2383,62 @@ static int smb135x_charger_remove(struct i2c_client *client) 
	return 0;

}



static int smb135x_suspend(struct device *dev)

{

	struct i2c_client *client = to_i2c_client(dev);

	struct smb135x_chg *chip = i2c_get_clientdata(client);

	int i, rc;



	/* Save the current IRQ config */

	for (i = 0; i < 3; i++) {

		rc = smb135x_read(chip, IRQ_CFG_REG + i,

					&chip->irq_cfg_mask[i]);

		if (rc)

			dev_err(chip->dev,

				"Couldn't save irq cfg regs rc=%d\n", rc);

	}



	/* enable only important IRQs */

	rc = smb135x_write(chip, IRQ_CFG_REG, 0);

	if (rc < 0)

		dev_err(chip->dev, "Couldn't set irq_cfg rc = %d\n", rc);



	rc = smb135x_write(chip, IRQ2_CFG_REG, IRQ2_BATT_MISSING_BIT

						| IRQ2_VBAT_LOW_BIT

						| IRQ2_POWER_OK_BIT);

	if (rc < 0)

		dev_err(chip->dev, "Couldn't set irq2_cfg rc = %d\n", rc);



	rc = smb135x_write(chip, IRQ3_CFG_REG, IRQ3_SRC_DETECT_BIT);

	if (rc < 0)

		dev_err(chip->dev, "Couldn't set irq3_cfg rc = %d\n", rc);



	return 0;

}



static int smb135x_resume(struct device *dev)

{

	struct i2c_client *client = to_i2c_client(dev);

	struct smb135x_chg *chip = i2c_get_clientdata(client);

	int i, rc;



	/* Restore the IRQ config */

	for (i = 0; i < 3; i++) {

		rc = smb135x_write(chip, IRQ_CFG_REG + i,

					chip->irq_cfg_mask[i]);

		if (rc)

			dev_err(chip->dev,

				"Couldn't restore irq cfg regs rc=%d\n", rc);

	}



	return 0;

}



static const struct dev_pm_ops smb135x_pm_ops = {

	.resume		= smb135x_resume,

	.suspend	= smb135x_suspend,

};



static const struct i2c_device_id smb135x_charger_id[] = {

	{"smb135x-charger", 0},

	{},
@@ -2393,6 +2450,7 @@ static struct i2c_driver smb135x_charger_driver = { 
		.name		= "smb135x-charger",

		.owner		= THIS_MODULE,

		.of_match_table	= smb135x_match_table,

		.pm		= &smb135x_pm_ops,

	},

	.probe		= smb135x_charger_probe,

	.remove		= smb135x_charger_remove,