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cpcap: suspend/resume

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Disable cpcap interrupts at suspend and re-enable at resume, to avoid
processing interrupts while the SPI controller is suspended.

Change-Id: I26676b8ce8983bf5477f169a15d811c474c6f5a4
Signed-off-by: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Todd Poynor 2010-08-04 20:25:59 -07:00 committed by Colin Cross
parent 1fa241ab56
commit a7ac4fced2
3 changed files with 51 additions and 0 deletions
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27
drivers/mfd/cpcap-core.c
View File

@ -27,6 +27,7 @@
#include <linux/reboot.h>
#include <linux/notifier.h>
#include <linux/delay.h>
#include <linux/pm.h>
struct cpcap_driver_info {
struct list_head list;
@ -38,6 +39,11 @@ static int ioctl(struct inode *inode,
static int __devinit cpcap_probe(struct spi_device *spi);
static int __devexit cpcap_remove(struct spi_device *spi);
#ifdef CONFIG_PM
static int cpcap_suspend(struct spi_device *spi, pm_message_t mesg);
static int cpcap_resume(struct spi_device *spi);
#endif
const static struct file_operations cpcap_fops = {
.owner = THIS_MODULE,
.ioctl = ioctl,
@ -57,6 +63,10 @@ static struct spi_driver cpcap_driver = {
},
.probe = cpcap_probe,
.remove = __devexit_p(cpcap_remove),
#ifdef CONFIG_PM
.suspend = cpcap_suspend,
.resume = cpcap_resume,
#endif
};
static struct platform_device cpcap_adc_device = {
@ -455,6 +465,23 @@ static void cpcap_shutdown(void)
spi_unregister_driver(&cpcap_driver);
}
#ifdef CONFIG_PM
static int cpcap_suspend(struct spi_device *spi, pm_message_t mesg)
{
struct cpcap_device *cpcap = spi_get_drvdata(spi);
return cpcap_irq_suspend(cpcap);
}
static int cpcap_resume(struct spi_device *spi)
{
struct cpcap_device *cpcap = spi_get_drvdata(spi);
return cpcap_irq_resume(cpcap);
}
#endif
subsys_initcall(cpcap_init);
module_exit(cpcap_shutdown);

18
drivers/mfd/cpcap-irq.c
View File

@ -630,3 +630,21 @@ int cpcap_irq_sense(struct cpcap_device *cpcap,
return ((val & EVENT_MASK(irq)) != 0) ? 1 : 0;
}
EXPORT_SYMBOL_GPL(cpcap_irq_sense);
#ifdef CONFIG_PM
int cpcap_irq_suspend(struct cpcap_device *cpcap)
{
struct spi_device *spi = cpcap->spi;
disable_irq(spi->irq);
return 0;
}
int cpcap_irq_resume(struct cpcap_device *cpcap)
{
struct spi_device *spi = cpcap->spi;
enable_irq(spi->irq);
return 0;
}
#endif

6
include/linux/spi/cpcap.h
View File

@ -717,6 +717,12 @@ int cpcap_irq_mask_get(struct cpcap_device *cpcap, enum cpcap_irqs int_event);
int cpcap_irq_sense(struct cpcap_device *cpcap, enum cpcap_irqs int_event,
unsigned char clear);
#ifdef CONFIG_PM
int cpcap_irq_suspend(struct cpcap_device *cpcap);
int cpcap_irq_resume(struct cpcap_device *cpcap);
#endif
int cpcap_adc_sync_read(struct cpcap_device *cpcap,
struct cpcap_adc_request *request);