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MFD: ucb1x00-core: add wakeup support

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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: Jochen Friedrich <jochen@scram.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2012-01-22 20:05:24 +00:00
parent a3364409c4
commit 3323761677
2 changed files with 63 additions and 0 deletions
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59
drivers/mfd/ucb1x00-core.c
View file

@ -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)

4
include/linux/mfd/ucb1x00.h
View file

@ -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;