[PATCH 2/8] Bluetooth: hci_h5: Add support for reset GPIO

Vasily Khoruzhick
2019-01-18T17:02:26Z

Some boards (e.g. Pine64 and Pinebook) wire a GPIO to reset pin of
RTL8723BS

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
---
drivers/bluetooth/hci_h5.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 069d1c8fde73..7ead8c3d8657 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -107,6 +107,7 @@ struct h5 {
const struct h5_vnd *vnd;
const char *id;

+ struct gpio_desc *reset_gpio;
struct gpio_desc *enable_gpio;
struct gpio_desc *device_wake_gpio;
};
@@ -833,6 +834,10 @@ static int h5_serdev_probe(struct serdev_device *serdev)
if (IS_ERR(h5->device_wake_gpio))
return PTR_ERR(h5->device_wake_gpio);

+ h5->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(h5->reset_gpio))
+ return PTR_ERR(h5->reset_gpio);
+
return hci_uart_register_device(&h5->serdev_hu, &h5p);
}

@@ -921,6 +926,9 @@ static void h5_btrtl_open(struct h5 *h5)

/* The controller needs up to 500ms to wakeup */
gpiod_set_value_cansleep(h5->enable_gpio, 1);
+ /* Take it out of reset */
+ gpiod_set_value_cansleep(h5->reset_gpio, 0);
+ msleep(100);
gpiod_set_value_cansleep(h5->device_wake_gpio, 1);
msleep(500);
}
@@ -928,6 +936,7 @@ static void h5_btrtl_open(struct h5 *h5)
static void h5_btrtl_close(struct h5 *h5)
{
gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
+ gpiod_set_value_cansleep(h5->reset_gpio, 1);
gpiod_set_value_cansleep(h5->enable_gpio, 0);
}

--
2.20.1