Provide PM support to imx_keypad and allow the keypad to be used as a wakeup source.
Tested on a mx27_3ds, which wakes up via keypad press.
Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
---
If I put disable_irq_wake(keypad->irq) inside imx_keypad_resume
like other keyboard drivers do I get the following:
mx27# echo mem > /sys/power/state
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.01 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
PM: suspend of devices complete after 0.692 msecs
PM: late suspend of devices complete after 0.418 msecs
PM: early resume of devices complete after 0.179 msecs
------------[ cut here ]------------
WARNING: at kernel/irq/manage.c:510 irq_set_irq_wake+0xdc/0xec()
Unbalanced IRQ 21 wake disable
Modules linked in:
[<c00197bc>] (unwind_backtrace+0x0/0xf4) from [<c002ba50>] (warn_slowpath_common
+0x4c/0x64)
[<c002ba50>] (warn_slowpath_common+0x4c/0x64) from [<c002bafc>] (warn_slowpath_f
mt+0x30/0x40)
[<c002bafc>] (warn_slowpath_fmt+0x30/0x40) from [<c0069db0>] (irq_set_irq_wake+0
xdc/0xec)
[<c0069db0>] (irq_set_irq_wake+0xdc/0xec) from [<c022b7b0>] (imx_keypad_resume+0
x30/0x38)
[<c022b7b0>] (imx_keypad_resume+0x30/0x38) from [<c01ec224>] (platform_pm_resume
+0x2c/0x4c)
[<c01ec224>] (platform_pm_resume+0x2c/0x4c) from [<c01ef568>] (pm_op+0xa0/0xc0)
[<c01ef568>] (pm_op+0xa0/0xc0) from [<c01ef9ac>] (device_resume+0x5c/0x100)
[<c01ef9ac>] (device_resume+0x5c/0x100) from [<c01efbc8>] (dpm_resume+0x134/0x19
0)
[<c01efbc8>] (dpm_resume+0x134/0x190) from [<c01efc30>] (dpm_resume_end+0xc/0x18
)
[<c01efc30>] (dpm_resume_end+0xc/0x18) from [<c0068860>] (suspend_devices_and_en
ter+0x160/0x338)
[<c0068860>] (suspend_devices_and_enter+0x160/0x338) from [<c0068b24>] (enter_st
ate+0xec/0x128)
[<c0068b24>] (enter_state+0xec/0x128) from [<c0067ee4>] (state_store+0xd0/0x124)
[<c0067ee4>] (state_store+0xd0/0x124) from [<c0192d58>] (kobj_attr_store+0x18/0x
1c)
[<c0192d58>] (kobj_attr_store+0x18/0x1c) from [<c01167ec>] (sysfs_write_file+0xf
8/0x17c)
[<c01167ec>] (sysfs_write_file+0xf8/0x17c) from [<c00c395c>] (vfs_write+0xb0/0x1
34)
[<c00c395c>] (vfs_write+0xb0/0x134) from [<c00c3ab0>] (sys_write+0x40/0x70)
[<c00c3ab0>] (sys_write+0x40/0x70) from [<c0013ea0>] (ret_fast_syscall+0x0/0x2c)
---[ end trace 5656d76309d84fa1 ]---
PM: resume of devices complete after 1.960 msecs
Restarting tasks ... done.
drivers/input/keyboard/imx_keypad.c | 25 +++++++++++++++++++++++++
1 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/drivers/input/keyboard/imx_keypad.c b/drivers/input/keyboard/imx_keypad.c
index d92c15c..4acb480 100644
--- a/drivers/input/keyboard/imx_keypad.c
+++ b/drivers/input/keyboard/imx_keypad.c
@@ -408,6 +408,28 @@ open_err:
return -EIO;
}
+#ifdef CONFIG_PM
+static int imx_keypad_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct imx_keypad *keypad = platform_get_drvdata(pdev);
+
+ if (device_may_wakeup(&pdev->dev))
+ enable_irq_wake(keypad->irq);
+
+ return 0;
+}
+
+static int imx_keypad_resume(struct device *dev)
+{
+ return 0;
+}
+
+static const struct dev_pm_ops imx_keypad_pm_ops = {
+ .suspend = imx_keypad_suspend,
+ .resume = imx_keypad_resume,
+};
+#endif
static int __devinit imx_keypad_probe(struct platform_device *pdev)
{
const struct matrix_keymap_data *keymap_data = pdev->dev.platform_data;
@@ -571,6 +593,9 @@ static struct platform_driver imx_keypad_driver = {
.driver = {
.name = "imx-keypad",
.owner = THIS_MODULE,
+#ifdef CONFIG_PM
+ .pm = &imx_keypad_pm_ops,
+#endif
},
.probe = imx_keypad_probe,
.remove = __devexit_p(imx_keypad_remove),
--
1.6.0.4
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