If the device is connected with SDIO bus, it can wake up the host using
either the SDIO controller (that requires MMC_PM_WAKE_SDIO_IRQ
capability) or the out-of-bound IRQ. This patch allows both.
Obviously, the SDIO controller must be able to keep the SDIO device
powered on.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@xxxxxxxxxx>
---
drivers/net/wireless/silabs/wfx/bus_sdio.c | 44 ++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/drivers/net/wireless/silabs/wfx/bus_sdio.c b/drivers/net/wireless/silabs/wfx/bus_sdio.c
index f290eecde773..bd8e1ffb61bb 100644
--- a/drivers/net/wireless/silabs/wfx/bus_sdio.c
+++ b/drivers/net/wireless/silabs/wfx/bus_sdio.c
@@ -14,6 +14,7 @@
#include <linux/of_irq.h>
#include <linux/irq.h>
#include <linux/align.h>
+#include <linux/pm.h>
#include "bus.h"
#include "wfx.h"
@@ -191,9 +192,46 @@ static const struct of_device_id wfx_sdio_of_match[] = {
};
MODULE_DEVICE_TABLE(of, wfx_sdio_of_match);
+static int wfx_sdio_suspend(struct device *dev)
+{
+ struct sdio_func *func = dev_to_sdio_func(dev);
+ struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
+ int ret;
+
+ if (!device_may_wakeup(dev))
+ return 0;
+
+ flush_work(&bus->core->hif.bh);
+ // Either "wakeup-source" attribute or out-of-band IRQ is required for WoWLAN
+ if (bus->of_irq) {
+ ret = enable_irq_wake(bus->of_irq);
+ if (ret)
+ return ret;
+ } else {
+ ret = sdio_set_host_pm_flags(func, MMC_PM_WAKE_SDIO_IRQ);
+ if (ret)
+ return ret;
+ }
+ return sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
+}
+
+static int wfx_sdio_resume(struct device *dev)
+{
+ struct sdio_func *func = dev_to_sdio_func(dev);
+ struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
+
+ if (!device_may_wakeup(dev))
+ return 0;
+ if (bus->of_irq)
+ return disable_irq_wake(bus->of_irq);
+ else
+ return 0;
+}
+
static int wfx_sdio_probe(struct sdio_func *func, const struct sdio_device_id *id)
{
const struct wfx_platform_data *pdata = of_device_get_match_data(&func->dev);
+ mmc_pm_flag_t pm_flag = sdio_get_host_pm_caps(func);
struct device_node *np = func->dev.of_node;
struct wfx_sdio_priv *bus;
int ret;
@@ -235,6 +273,9 @@ static int wfx_sdio_probe(struct sdio_func *func, const struct sdio_device_id *i
if (ret)
goto sdio_release;
+ if (pm_flag & MMC_PM_KEEP_POWER)
+ device_set_wakeup_capable(&func->dev, true);
+
return 0;
sdio_release:
@@ -261,6 +302,8 @@ static const struct sdio_device_id wfx_sdio_ids[] = {
};
MODULE_DEVICE_TABLE(sdio, wfx_sdio_ids);
+DEFINE_SIMPLE_DEV_PM_OPS(wfx_sdio_pm_ops, wfx_sdio_suspend, wfx_sdio_resume);
+
struct sdio_driver wfx_sdio_driver = {
.name = "wfx-sdio",
.id_table = wfx_sdio_ids,
@@ -268,5 +311,6 @@ struct sdio_driver wfx_sdio_driver = {
.remove = wfx_sdio_remove,
.drv = {
.of_match_table = wfx_sdio_of_match,
+ .pm = &wfx_sdio_pm_ops,
}
};
--
2.39.5
