278 lines
6.9 KiB
C
278 lines
6.9 KiB
C
/*
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* wakeirq.c - Device wakeirq helper functions
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <linux/pm_wakeirq.h>
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#include "power.h"
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/**
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* dev_pm_attach_wake_irq - Attach device interrupt as a wake IRQ
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* @dev: Device entry
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* @irq: Device wake-up capable interrupt
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* @wirq: Wake irq specific data
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*
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* Internal function to attach either a device IO interrupt or a
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* dedicated wake-up interrupt as a wake IRQ.
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*/
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static int dev_pm_attach_wake_irq(struct device *dev, int irq,
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struct wake_irq *wirq)
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{
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unsigned long flags;
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int err;
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if (!dev || !wirq)
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return -EINVAL;
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spin_lock_irqsave(&dev->power.lock, flags);
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if (dev_WARN_ONCE(dev, dev->power.wakeirq,
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"wake irq already initialized\n")) {
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spin_unlock_irqrestore(&dev->power.lock, flags);
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return -EEXIST;
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}
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err = device_wakeup_attach_irq(dev, wirq);
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if (!err)
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dev->power.wakeirq = wirq;
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spin_unlock_irqrestore(&dev->power.lock, flags);
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return err;
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}
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/**
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* dev_pm_set_wake_irq - Attach device IO interrupt as wake IRQ
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* @dev: Device entry
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* @irq: Device IO interrupt
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*
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* Attach a device IO interrupt as a wake IRQ. The wake IRQ gets
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* automatically configured for wake-up from suspend based
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* on the device specific sysfs wakeup entry. Typically called
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* during driver probe after calling device_init_wakeup().
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*/
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int dev_pm_set_wake_irq(struct device *dev, int irq)
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{
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struct wake_irq *wirq;
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int err;
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if (irq < 0)
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return -EINVAL;
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wirq = kzalloc(sizeof(*wirq), GFP_KERNEL);
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if (!wirq)
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return -ENOMEM;
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wirq->dev = dev;
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wirq->irq = irq;
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err = dev_pm_attach_wake_irq(dev, irq, wirq);
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if (err)
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kfree(wirq);
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return err;
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}
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EXPORT_SYMBOL_GPL(dev_pm_set_wake_irq);
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/**
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* dev_pm_clear_wake_irq - Detach a device IO interrupt wake IRQ
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* @dev: Device entry
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*
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* Detach a device wake IRQ and free resources.
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*
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* Note that it's OK for drivers to call this without calling
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* dev_pm_set_wake_irq() as all the driver instances may not have
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* a wake IRQ configured. This avoid adding wake IRQ specific
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* checks into the drivers.
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*/
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void dev_pm_clear_wake_irq(struct device *dev)
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{
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struct wake_irq *wirq = dev->power.wakeirq;
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unsigned long flags;
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if (!wirq)
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return;
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spin_lock_irqsave(&dev->power.lock, flags);
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device_wakeup_detach_irq(dev);
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dev->power.wakeirq = NULL;
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spin_unlock_irqrestore(&dev->power.lock, flags);
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if (wirq->dedicated_irq)
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free_irq(wirq->irq, wirq);
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kfree(wirq);
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}
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EXPORT_SYMBOL_GPL(dev_pm_clear_wake_irq);
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/**
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* handle_threaded_wake_irq - Handler for dedicated wake-up interrupts
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* @irq: Device specific dedicated wake-up interrupt
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* @_wirq: Wake IRQ data
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*
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* Some devices have a separate wake-up interrupt in addition to the
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* device IO interrupt. The wake-up interrupt signals that a device
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* should be woken up from it's idle state. This handler uses device
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* specific pm_runtime functions to wake the device, and then it's
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* up to the device to do whatever it needs to. Note that as the
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* device may need to restore context and start up regulators, we
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* use a threaded IRQ.
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*
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* Also note that we are not resending the lost device interrupts.
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* We assume that the wake-up interrupt just needs to wake-up the
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* device, and then device's pm_runtime_resume() can deal with the
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* situation.
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*/
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static irqreturn_t handle_threaded_wake_irq(int irq, void *_wirq)
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{
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struct wake_irq *wirq = _wirq;
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int res;
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/* We don't want RPM_ASYNC or RPM_NOWAIT here */
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res = pm_runtime_resume(wirq->dev);
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if (res < 0)
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dev_warn(wirq->dev,
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"wake IRQ with no resume: %i\n", res);
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return IRQ_HANDLED;
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}
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/**
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* dev_pm_set_dedicated_wake_irq - Request a dedicated wake-up interrupt
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* @dev: Device entry
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* @irq: Device wake-up interrupt
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*
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* Unless your hardware has separate wake-up interrupts in addition
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* to the device IO interrupts, you don't need this.
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*
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* Sets up a threaded interrupt handler for a device that has
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* a dedicated wake-up interrupt in addition to the device IO
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* interrupt.
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*
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* The interrupt starts disabled, and needs to be managed for
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* the device by the bus code or the device driver using
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* dev_pm_enable_wake_irq() and dev_pm_disable_wake_irq()
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* functions.
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*/
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int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
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{
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struct wake_irq *wirq;
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int err;
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if (irq < 0)
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return -EINVAL;
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wirq = kzalloc(sizeof(*wirq), GFP_KERNEL);
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if (!wirq)
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return -ENOMEM;
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wirq->dev = dev;
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wirq->irq = irq;
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wirq->dedicated_irq = true;
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irq_set_status_flags(irq, IRQ_NOAUTOEN);
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/*
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* Consumer device may need to power up and restore state
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* so we use a threaded irq.
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*/
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err = request_threaded_irq(irq, NULL, handle_threaded_wake_irq,
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IRQF_ONESHOT, dev_name(dev), wirq);
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if (err)
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goto err_free;
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err = dev_pm_attach_wake_irq(dev, irq, wirq);
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if (err)
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goto err_free_irq;
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return err;
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err_free_irq:
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free_irq(irq, wirq);
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err_free:
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kfree(wirq);
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return err;
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}
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EXPORT_SYMBOL_GPL(dev_pm_set_dedicated_wake_irq);
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/**
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* dev_pm_enable_wake_irq - Enable device wake-up interrupt
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* @dev: Device
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*
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* Called from the bus code or the device driver for
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* runtime_suspend() to enable the wake-up interrupt while
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* the device is running.
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*
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* Note that for runtime_suspend()) the wake-up interrupts
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* should be unconditionally enabled unlike for suspend()
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* that is conditional.
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*/
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void dev_pm_enable_wake_irq(struct device *dev)
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{
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struct wake_irq *wirq = dev->power.wakeirq;
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if (wirq && wirq->dedicated_irq)
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enable_irq(wirq->irq);
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}
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EXPORT_SYMBOL_GPL(dev_pm_enable_wake_irq);
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/**
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* dev_pm_disable_wake_irq - Disable device wake-up interrupt
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* @dev: Device
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*
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* Called from the bus code or the device driver for
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* runtime_resume() to disable the wake-up interrupt while
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* the device is running.
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*/
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void dev_pm_disable_wake_irq(struct device *dev)
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{
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struct wake_irq *wirq = dev->power.wakeirq;
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if (wirq && wirq->dedicated_irq)
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disable_irq_nosync(wirq->irq);
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}
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EXPORT_SYMBOL_GPL(dev_pm_disable_wake_irq);
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/**
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* dev_pm_arm_wake_irq - Arm device wake-up
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* @wirq: Device wake-up interrupt
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*
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* Sets up the wake-up event conditionally based on the
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* device_may_wake().
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*/
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void dev_pm_arm_wake_irq(struct wake_irq *wirq)
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{
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if (!wirq)
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return;
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if (device_may_wakeup(wirq->dev))
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enable_irq_wake(wirq->irq);
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}
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/**
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* dev_pm_disarm_wake_irq - Disarm device wake-up
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* @wirq: Device wake-up interrupt
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*
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* Clears up the wake-up event conditionally based on the
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* device_may_wake().
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*/
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void dev_pm_disarm_wake_irq(struct wake_irq *wirq)
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{
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if (!wirq)
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return;
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if (device_may_wakeup(wirq->dev))
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disable_irq_wake(wirq->irq);
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}
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