Some platforms would like to disable D+ pullup on suspend, to drain as
low power, as possible. E.g. this was requested by mioa701 board
maintainers.
Suspend/resume is done in _noirq path, to force handling of pullup after
the main UDC driver suspend/before resume.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@xxxxxxxxx>
---
drivers/usb/otg/gpio_vbus.c | 42 +++++++++++++++++++++++++++++++++++++++++
include/linux/usb/gpio_vbus.h | 1 +
2 files changed, 43 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/otg/gpio_vbus.c b/drivers/usb/otg/gpio_vbus.c
index 52733d9..3b27b1f 100644
--- a/drivers/usb/otg/gpio_vbus.c
+++ b/drivers/usb/otg/gpio_vbus.c
@@ -327,6 +327,47 @@ static int __exit gpio_vbus_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+static int gpio_vbus_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
+ struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data;
+
+ if (gpio_vbus->otg.gadget && pdata->disconnect_on_suspend) {
+ /* optionally disable D+ pullup */
+ if (gpio_is_valid(pdata->gpio_pullup))
+ gpio_set_value(pdata->gpio_pullup,
+ pdata->gpio_pullup_inverted);
+
+ set_vbus_draw(gpio_vbus, 0);
+ }
+ return 0;
+}
+
+static int gpio_vbus_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
+
+ if (gpio_vbus->otg.gadget)
+ schedule_work(&gpio_vbus->work);
+
+ return 0;
+}
+static const struct dev_pm_ops gpio_vbus_pm_ops = {
+ .suspend_noirq = gpio_vbus_suspend,
+ .resume_noirq = gpio_vbus_resume,
+ .freeze_noirq = gpio_vbus_suspend,
+ .thaw_noirq = gpio_vbus_resume,
+ .poweroff_noirq = gpio_vbus_suspend,
+ .restore_noirq = gpio_vbus_resume,
+};
+#define GPIO_VBUS_PM_OPS (&gpio_vbus_pm_ops)
+#else
+#define GPIO_VBUS_PM_OPS NULL
+#endif
+
/* NOTE: the gpio-vbus device may *NOT* be hotplugged */
MODULE_ALIAS("platform:gpio-vbus");
@@ -335,6 +376,7 @@ static struct platform_driver gpio_vbus_driver = {
.driver = {
.name = "gpio-vbus",
.owner = THIS_MODULE,
+ .pm = GPIO_VBUS_PM_OPS,
},
.remove = __exit_p(gpio_vbus_remove),
};
diff --git a/include/linux/usb/gpio_vbus.h b/include/linux/usb/gpio_vbus.h
index d9f03cc..2faa38d 100644
--- a/include/linux/usb/gpio_vbus.h
+++ b/include/linux/usb/gpio_vbus.h
@@ -27,4 +27,5 @@ struct gpio_vbus_mach_info {
int gpio_pullup;
bool gpio_vbus_inverted;
bool gpio_pullup_inverted;
+ bool disconnect_on_suspend;
};
--
1.7.5.4
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