Obtain and drive the optional reset GPIO line if this is
not hardwired in the platform. This is needed on the
Samsung GT-I9070 mobile phone.
The invers of power is used, this should be OK to apply
simultaneously as the power signal according to
figures 47-51 on pages 159-161 in the BCM4330 datasheet.
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
drivers/bluetooth/hci_bcm.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 8ea5ca8d71d6..15a28b90c2d0 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -68,6 +68,8 @@ struct bcm_device_data {
* deassert = Bluetooth device may sleep when sleep criteria are met
* @shutdown: BT_REG_ON pin,
* power up or power down Bluetooth device internal regulators
+ * @reset: BT_RST_N pin,
+ * active low resets the Bluetooth logic core
* @set_device_wakeup: callback to toggle BT_WAKE pin
* either by accessing @device_wakeup or by calling @btlp
* @set_shutdown: callback to toggle BT_REG_ON pin
@@ -101,6 +103,7 @@ struct bcm_device {
const char *name;
struct gpio_desc *device_wakeup;
struct gpio_desc *shutdown;
+ struct gpio_desc *reset;
int (*set_device_wakeup)(struct bcm_device *, bool);
int (*set_shutdown)(struct bcm_device *, bool);
#ifdef CONFIG_ACPI
@@ -984,6 +987,15 @@ static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
{
gpiod_set_value_cansleep(dev->shutdown, powered);
+ if (dev->reset)
+ /*
+ * The reset line is asserted on powerdown and deasserted
+ * on poweron so the inverse of powered is used. Notice
+ * that the GPIO line BT_RST_N needs to be specified as
+ * active low in the device tree or similar system
+ * description.
+ */
+ gpiod_set_value_cansleep(dev->reset, !powered);
return 0;
}
@@ -1049,6 +1061,11 @@ static int bcm_get_resources(struct bcm_device *dev)
if (IS_ERR(dev->shutdown))
return PTR_ERR(dev->shutdown);
+ dev->reset = devm_gpiod_get_optional(dev->dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(dev->reset))
+ return PTR_ERR(dev->reset);
+
dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
dev->set_shutdown = bcm_gpio_set_shutdown;
--
2.26.2
