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Message-ID: <1439308638-14582-10-git-send-email-kishon@ti.com>
Date: Tue, 11 Aug 2015 21:27:08 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: <gregkh@...uxfoundation.org>
CC: <kishon@...com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 09/19] phy-sun4i-usb: Add support for monitoring vbus via a power-supply
From: Hans de Goede <hdegoede@...hat.com>
On some boards there is no vbus_det gpio pin, instead vbus-detection for
otg can be done via the pmic.
This commit adds support for monitoring vbus_det via the power_supply
exported by the pmic, enabling support for otg on these boards.
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
.../devicetree/bindings/phy/sun4i-usb-phy.txt | 1 +
drivers/phy/Kconfig | 1 +
drivers/phy/phy-sun4i-usb.c | 76 ++++++++++++++++++--
3 files changed, 71 insertions(+), 7 deletions(-)
diff --git a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
index 5f48979..0cebf74 100644
--- a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
+++ b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
@@ -29,6 +29,7 @@ Required properties:
Optional properties:
- usb0_id_det-gpios : gpio phandle for reading the otg id pin value
- usb0_vbus_det-gpios : gpio phandle for detecting the presence of usb0 vbus
+- usb0_vbus_power-supply: power-supply phandle for usb0 vbus presence detect
- usb0_vbus-supply : regulator phandle for controller usb0 vbus
- usb1_vbus-supply : regulator phandle for controller usb1 vbus
- usb2_vbus-supply : regulator phandle for controller usb2 vbus
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index c0c1ad2..0fe9bff 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -209,6 +209,7 @@ config PHY_SUN4I_USB
depends on ARCH_SUNXI && HAS_IOMEM && OF
depends on RESET_CONTROLLER
depends on EXTCON
+ depends on POWER_SUPPLY
select GENERIC_PHY
help
Enable this to support the transceiver that is part of Allwinner
diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index 4ba9856..5138843 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -36,6 +36,7 @@
#include <linux/phy/phy.h>
#include <linux/phy/phy-sun4i-usb.h>
#include <linux/platform_device.h>
+#include <linux/power_supply.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/workqueue.h>
@@ -108,6 +109,9 @@ struct sun4i_usb_phy_data {
bool phy0_poll;
struct gpio_desc *id_det_gpio;
struct gpio_desc *vbus_det_gpio;
+ struct power_supply *vbus_power_supply;
+ struct notifier_block vbus_power_nb;
+ bool vbus_power_nb_registered;
int id_det_irq;
int vbus_det_irq;
int id_det;
@@ -352,6 +356,30 @@ static struct phy_ops sun4i_usb_phy_ops = {
.owner = THIS_MODULE,
};
+static int sun4i_usb_phy0_get_vbus_det(struct sun4i_usb_phy_data *data)
+{
+ if (data->vbus_det_gpio)
+ return gpiod_get_value_cansleep(data->vbus_det_gpio);
+
+ if (data->vbus_power_supply) {
+ union power_supply_propval val;
+ int r;
+
+ r = power_supply_get_property(data->vbus_power_supply,
+ POWER_SUPPLY_PROP_PRESENT, &val);
+ if (r == 0)
+ return val.intval;
+ }
+
+ /* Fallback: report vbus as high */
+ return 1;
+}
+
+static bool sun4i_usb_phy0_have_vbus_det(struct sun4i_usb_phy_data *data)
+{
+ return data->vbus_det_gpio || data->vbus_power_supply;
+}
+
static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
{
struct sun4i_usb_phy_data *data =
@@ -360,10 +388,7 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
int id_det, vbus_det, id_notify = 0, vbus_notify = 0;
id_det = gpiod_get_value_cansleep(data->id_det_gpio);
- if (data->vbus_det_gpio)
- vbus_det = gpiod_get_value_cansleep(data->vbus_det_gpio);
- else
- vbus_det = 1; /* Report vbus as high */
+ vbus_det = sun4i_usb_phy0_get_vbus_det(data);
mutex_lock(&phy0->mutex);
@@ -378,7 +403,7 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
* without vbus detection report vbus low for long enough for
* the musb-ip to end the current device session.
*/
- if (!data->vbus_det_gpio && id_det == 0) {
+ if (!sun4i_usb_phy0_have_vbus_det(data) && id_det == 0) {
sun4i_usb_phy0_set_vbus_detect(phy0, 0);
msleep(200);
sun4i_usb_phy0_set_vbus_detect(phy0, 1);
@@ -404,7 +429,7 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
* without vbus detection report vbus low for long enough to
* the musb-ip to end the current host session.
*/
- if (!data->vbus_det_gpio && id_det == 1) {
+ if (!sun4i_usb_phy0_have_vbus_det(data) && id_det == 1) {
mutex_lock(&phy0->mutex);
sun4i_usb_phy0_set_vbus_detect(phy0, 0);
msleep(1000);
@@ -430,6 +455,20 @@ static irqreturn_t sun4i_usb_phy0_id_vbus_det_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static int sun4i_usb_phy0_vbus_notify(struct notifier_block *nb,
+ unsigned long val, void *v)
+{
+ struct sun4i_usb_phy_data *data =
+ container_of(nb, struct sun4i_usb_phy_data, vbus_power_nb);
+ struct power_supply *psy = v;
+
+ /* Properties on the vbus_power_supply changed, scan vbus_det */
+ if (val == PSY_EVENT_PROP_CHANGED && psy == data->vbus_power_supply)
+ mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
+
+ return NOTIFY_OK;
+}
+
static struct phy *sun4i_usb_phy_xlate(struct device *dev,
struct of_phandle_args *args)
{
@@ -446,6 +485,8 @@ static int sun4i_usb_phy_remove(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct sun4i_usb_phy_data *data = dev_get_drvdata(dev);
+ if (data->vbus_power_nb_registered)
+ power_supply_unreg_notifier(&data->vbus_power_nb);
if (data->id_det_irq >= 0)
devm_free_irq(dev, data->id_det_irq, data);
if (data->vbus_det_irq >= 0)
@@ -522,8 +563,18 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
data->vbus_det_gpio = NULL;
}
+ if (of_find_property(np, "usb0_vbus_power-supply", NULL)) {
+ data->vbus_power_supply = devm_power_supply_get_by_phandle(dev,
+ "usb0_vbus_power-supply");
+ if (IS_ERR(data->vbus_power_supply))
+ return PTR_ERR(data->vbus_power_supply);
+
+ if (!data->vbus_power_supply)
+ return -EPROBE_DEFER;
+ }
+
/* vbus_det without id_det makes no sense, and is not supported */
- if (data->vbus_det_gpio && !data->id_det_gpio) {
+ if (sun4i_usb_phy0_have_vbus_det(data) && !data->id_det_gpio) {
dev_err(dev, "usb0_id_det missing or invalid\n");
return -ENODEV;
}
@@ -620,6 +671,17 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
}
}
+ if (data->vbus_power_supply) {
+ data->vbus_power_nb.notifier_call = sun4i_usb_phy0_vbus_notify;
+ data->vbus_power_nb.priority = 0;
+ ret = power_supply_reg_notifier(&data->vbus_power_nb);
+ if (ret) {
+ sun4i_usb_phy_remove(pdev); /* Stop detect work */
+ return ret;
+ }
+ data->vbus_power_nb_registered = true;
+ }
+
phy_provider = devm_of_phy_provider_register(dev, sun4i_usb_phy_xlate);
if (IS_ERR(phy_provider)) {
sun4i_usb_phy_remove(pdev); /* Stop detect work */
--
1.7.9.5
--
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