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Bluetooth: btnxpuart: Implement host-wakeup feature

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This implements host wakeup feature by reading the device tree property
wakeup-source and 'wakeup' interrupt, and nxp,wakeout-pin, and configuring
it as a FALLING EDGE triggered interrupt.

When host is suspended, a trigger from the WAKE_OUT pin of the
controller wakes it up.

To enable this feature, both device tree properties are needed to be
defined.

Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@nxp.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Neeraj Sanjay Kale 2025-04-14 23:29:52 +05:30 • committed by Luiz Augusto von Dentz
parent a12a5f5ff0
commit c50b56664e
1 changed files with 52 additions and 6 deletions
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58
drivers/bluetooth/btnxpuart.c
View file

@ -17,6 +17,7 @@
#include <linux/crc32.h>
#include <linux/string_helpers.h>
#include <linux/gpio/consumer.h>
#include <linux/of_irq.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
@ -143,7 +144,9 @@ struct ps_data {
bool driver_sent_cmd;
u16 h2c_ps_interval;
u16 c2h_ps_interval;
bool wakeup_source;
struct gpio_desc *h2c_ps_gpio;
s32 irq_handler;
struct hci_dev *hdev;
struct work_struct work;
struct timer_list ps_timer;
@ -476,12 +479,21 @@ static void ps_timeout_func(struct timer_list *t)
}
}
static irqreturn_t ps_host_wakeup_irq_handler(int irq, void *priv)
{
struct btnxpuart_dev *nxpdev = (struct btnxpuart_dev *)priv;
bt_dev_dbg(nxpdev->hdev, "Host wakeup interrupt");
return IRQ_HANDLED;
}
static int ps_setup(struct hci_dev *hdev)
{
struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
struct serdev_device *serdev = nxpdev->serdev;
struct ps_data *psdata = &nxpdev->psdata;
int ret;
/* Out-Of-Band Device Wakeup */
psdata->h2c_ps_gpio = devm_gpiod_get_optional(&serdev->dev, "device-wakeup",
GPIOD_OUT_LOW);
if (IS_ERR(psdata->h2c_ps_gpio)) {
@ -493,11 +505,37 @@ static int ps_setup(struct hci_dev *hdev)
if (device_property_read_u8(&serdev->dev, "nxp,wakein-pin", &psdata->h2c_wakeup_gpio)) {
psdata->h2c_wakeup_gpio = 0xff; /* 0xff: use default pin/gpio */
} else if (!psdata->h2c_ps_gpio) {
bt_dev_warn(hdev, "nxp,wakein-pin property without device-wakeup GPIO");
bt_dev_warn(hdev, "nxp,wakein-pin property without device-wakeup-gpios");
psdata->h2c_wakeup_gpio = 0xff;
}
device_property_read_u8(&serdev->dev, "nxp,wakeout-pin", &psdata->c2h_wakeup_gpio);
/* Out-Of-Band Host Wakeup */
if (of_property_read_bool(serdev->dev.of_node, "wakeup-source")) {
psdata->irq_handler = of_irq_get_byname(serdev->dev.of_node, "wakeup");
bt_dev_info(nxpdev->hdev, "irq_handler: %d", psdata->irq_handler);
if (psdata->irq_handler > 0)
psdata->wakeup_source = true;
}
if (device_property_read_u8(&serdev->dev, "nxp,wakeout-pin", &psdata->c2h_wakeup_gpio)) {
psdata->c2h_wakeup_gpio = 0xff;
if (psdata->wakeup_source) {
bt_dev_warn(hdev, "host wakeup interrupt without nxp,wakeout-pin");
psdata->wakeup_source = false;
}
} else if (!psdata->wakeup_source) {
bt_dev_warn(hdev, "nxp,wakeout-pin property without host wakeup interrupt");
psdata->c2h_wakeup_gpio = 0xff;
}
if (psdata->wakeup_source) {
ret = devm_request_irq(&serdev->dev, psdata->irq_handler,
ps_host_wakeup_irq_handler,
IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
dev_name(&serdev->dev), nxpdev);
disable_irq(psdata->irq_handler);
device_init_wakeup(&serdev->dev, true);
}
psdata->hdev = hdev;
INIT_WORK(&psdata->work, ps_work_func);
@ -637,12 +675,10 @@ static void ps_init(struct hci_dev *hdev)
psdata->ps_state = PS_STATE_AWAKE;
if (psdata->c2h_wakeup_gpio) {
if (psdata->c2h_wakeup_gpio != 0xff)
psdata->c2h_wakeupmode = BT_HOST_WAKEUP_METHOD_GPIO;
} else {
else
psdata->c2h_wakeupmode = BT_HOST_WAKEUP_METHOD_NONE;
psdata->c2h_wakeup_gpio = 0xff;
}
psdata->cur_h2c_wakeupmode = WAKEUP_METHOD_INVALID;
if (psdata->h2c_ps_gpio)
@ -1821,6 +1857,11 @@ static int nxp_serdev_suspend(struct device *dev)
struct ps_data *psdata = &nxpdev->psdata;
ps_control(psdata->hdev, PS_STATE_SLEEP);
if (psdata->wakeup_source) {
enable_irq_wake(psdata->irq_handler);
enable_irq(psdata->irq_handler);
}
return 0;
}
@ -1829,6 +1870,11 @@ static int nxp_serdev_resume(struct device *dev)
struct btnxpuart_dev *nxpdev = dev_get_drvdata(dev);
struct ps_data *psdata = &nxpdev->psdata;
if (psdata->wakeup_source) {
disable_irq(psdata->irq_handler);
disable_irq_wake(psdata->irq_handler);
}
ps_control(psdata->hdev, PS_STATE_AWAKE);
return 0;
}