Commit 33237616 authored by Russell King's avatar Russell King
Browse files

MFD: ucb1x00-core: add wakeup support 



Add genirq wakeup support for the ucb1x00 device.  This allows an
attached gpio_keys driver to wakeup the system.  Touchscreen is also
possible.

When there are no wakeup sources, ask the platform to assert the reset
signal to avoid any unexpected behaviour; this also puts the reset
signal at the right level when power is removed from the device.

Acked-by: default avatarJochen Friedrich <jochen@scram.de>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent a3364409

drivers/mfd/ucb1x00-core.c

+59 −0
Original line number Diff line number Diff line
@@ -362,12 +362,32 @@ static int ucb1x00_irq_set_type(struct irq_data *data, unsigned int type) 
	return 0;

}



static int ucb1x00_irq_set_wake(struct irq_data *data, unsigned int on)

{

	struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data);

	struct ucb1x00_plat_data *pdata = ucb->mcp->attached_device.platform_data;

	unsigned mask = 1 << (data->irq - ucb->irq_base);



	if (!pdata || !pdata->can_wakeup)

		return -EINVAL;



	raw_spin_lock(&ucb->irq_lock);

	if (on)

		ucb->irq_wake |= mask;

	else

		ucb->irq_wake &= ~mask;

	raw_spin_unlock(&ucb->irq_lock);



	return 0;

}



static struct irq_chip ucb1x00_irqchip = {

	.name = "ucb1x00",

	.irq_ack = ucb1x00_irq_noop,

	.irq_mask = ucb1x00_irq_mask,

	.irq_unmask = ucb1x00_irq_unmask,

	.irq_set_type = ucb1x00_irq_set_type,

	.irq_set_wake = ucb1x00_irq_set_wake,

};



static int ucb1x00_add_dev(struct ucb1x00 *ucb, struct ucb1x00_driver *drv)
@@ -565,6 +585,9 @@ static int ucb1x00_probe(struct mcp *mcp) 


	mcp_set_drvdata(mcp, ucb);



	if (pdata)

		device_set_wakeup_capable(&ucb->dev, pdata->can_wakeup);



	INIT_LIST_HEAD(&ucb->devs);

	mutex_lock(&ucb1x00_mutex);

	list_add_tail(&ucb->node, &ucb1x00_devices);
@@ -648,6 +671,7 @@ void ucb1x00_unregister_driver(struct ucb1x00_driver *drv) 


static int ucb1x00_suspend(struct device *dev)

{

	struct ucb1x00_plat_data *pdata = dev->platform_data;

	struct ucb1x00 *ucb = dev_get_drvdata(dev);

	struct ucb1x00_dev *udev;
@@ -657,18 +681,53 @@ static int ucb1x00_suspend(struct device *dev) 
			udev->drv->suspend(udev);

	}

	mutex_unlock(&ucb1x00_mutex);



	if (ucb->irq_wake) {

		unsigned long flags;



		raw_spin_lock_irqsave(&ucb->irq_lock, flags);

		ucb1x00_enable(ucb);

		ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl &

				  ucb->irq_wake);

		ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl &

				  ucb->irq_wake);

		ucb1x00_disable(ucb);

		raw_spin_unlock_irqrestore(&ucb->irq_lock, flags);



		enable_irq_wake(ucb->irq);

	} else if (pdata && pdata->reset)

		pdata->reset(UCB_RST_SUSPEND);



	return 0;

}



static int ucb1x00_resume(struct device *dev)

{

	struct ucb1x00_plat_data *pdata = dev->platform_data;

	struct ucb1x00 *ucb = dev_get_drvdata(dev);

	struct ucb1x00_dev *udev;



	if (!ucb->irq_wake && pdata && pdata->reset)

		pdata->reset(UCB_RST_RESUME);



	ucb1x00_enable(ucb);

	ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);

	ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);



	if (ucb->irq_wake) {

		unsigned long flags;



		raw_spin_lock_irqsave(&ucb->irq_lock, flags);

		ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl &

				  ucb->irq_mask);

		ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl &

				  ucb->irq_mask);

		raw_spin_unlock_irqrestore(&ucb->irq_lock, flags);



		disable_irq_wake(ucb->irq);

	}

	ucb1x00_disable(ucb);



	mutex_lock(&ucb1x00_mutex);

	list_for_each_entry(udev, &ucb->devs, dev_node) {

		if (udev->drv->resume)

include/linux/mfd/ucb1x00.h

+4 −0
Original line number Diff line number Diff line
@@ -106,6 +106,8 @@ 


enum ucb1x00_reset {

	UCB_RST_PROBE,

	UCB_RST_RESUME,

	UCB_RST_SUSPEND,

	UCB_RST_REMOVE,

	UCB_RST_PROBE_FAIL,

};
@@ -114,6 +116,7 @@ struct ucb1x00_plat_data { 
	void			(*reset)(enum ucb1x00_reset);

	unsigned		irq_base;

	int			gpio_base;

	unsigned		can_wakeup;

};



struct ucb1x00 {
@@ -130,6 +133,7 @@ struct ucb1x00 { 
	u16			irq_fal_enbl;

	u16			irq_ris_enbl;

	u16			irq_mask;

	u16			irq_wake;

	struct device		dev;

	struct list_head	node;

	struct list_head	devs;

CRA Git | Maintained and supported by SUSTech CRA and CCSE