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Subject[PATCH v2 5/8] usb: ohci-da8xx: add vbus and overcurrent gpios
Date
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

There are two users upstream which register external callbacks for
switching the port power on/off and overcurrent protection. Both
users only use two GPIOs for that. Instead of having that functionality
in the board files, move the logic into the OHCI driver - including
the interrupt handler for overcurrent detection.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
---
drivers/usb/host/ohci-da8xx.c | 99 ++++++++++++++++++-----------------
1 file changed, 50 insertions(+), 49 deletions(-)

diff --git a/drivers/usb/host/ohci-da8xx.c b/drivers/usb/host/ohci-da8xx.c
index e8ede0b5e3f0..80c23307fbfe 100644
--- a/drivers/usb/host/ohci-da8xx.c
+++ b/drivers/usb/host/ohci-da8xx.c
@@ -12,6 +12,7 @@
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
+#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
@@ -40,6 +41,8 @@ struct da8xx_ohci_hcd {
struct regulator *vbus_reg;
struct notifier_block nb;
unsigned int reg_enabled;
+ struct gpio_desc *vbus_gpio;
+ struct gpio_desc *oc_gpio;
};

#define to_da8xx_ohci(hcd) (struct da8xx_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
@@ -86,12 +89,13 @@ static void ohci_da8xx_disable(struct usb_hcd *hcd)
static int ohci_da8xx_set_power(struct usb_hcd *hcd, int on)
{
struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
- struct device *dev = hcd->self.controller;
- struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
+ struct device *dev = hcd->self.controller;
int ret;

- if (hub && hub->set_power)
- return hub->set_power(1, on);
+ if (da8xx_ohci->vbus_gpio) {
+ gpiod_set_value_cansleep(da8xx_ohci->vbus_gpio, on);
+ return 0;
+ }

if (!da8xx_ohci->vbus_reg)
return 0;
@@ -119,11 +123,9 @@ static int ohci_da8xx_set_power(struct usb_hcd *hcd, int on)
static int ohci_da8xx_get_power(struct usb_hcd *hcd)
{
struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
- struct device *dev = hcd->self.controller;
- struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);

- if (hub && hub->get_power)
- return hub->get_power(1);
+ if (da8xx_ohci->vbus_gpio)
+ return gpiod_get_value_cansleep(da8xx_ohci->vbus_gpio);

if (da8xx_ohci->vbus_reg)
return regulator_is_enabled(da8xx_ohci->vbus_reg);
@@ -134,13 +136,11 @@ static int ohci_da8xx_get_power(struct usb_hcd *hcd)
static int ohci_da8xx_get_oci(struct usb_hcd *hcd)
{
struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
- struct device *dev = hcd->self.controller;
- struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
unsigned int flags;
int ret;

- if (hub && hub->get_oci)
- return hub->get_oci(1);
+ if (da8xx_ohci->oc_gpio)
+ return gpiod_get_value_cansleep(da8xx_ohci->oc_gpio);

if (!da8xx_ohci->vbus_reg)
return 0;
@@ -158,10 +158,8 @@ static int ohci_da8xx_get_oci(struct usb_hcd *hcd)
static int ohci_da8xx_has_set_power(struct usb_hcd *hcd)
{
struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
- struct device *dev = hcd->self.controller;
- struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);

- if (hub && hub->set_power)
+ if (da8xx_ohci->vbus_gpio)
return 1;

if (da8xx_ohci->vbus_reg)
@@ -173,10 +171,8 @@ static int ohci_da8xx_has_set_power(struct usb_hcd *hcd)
static int ohci_da8xx_has_oci(struct usb_hcd *hcd)
{
struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
- struct device *dev = hcd->self.controller;
- struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);

- if (hub && hub->get_oci)
+ if (da8xx_ohci->oc_gpio)
return 1;

if (da8xx_ohci->vbus_reg)
@@ -196,19 +192,6 @@ static int ohci_da8xx_has_potpgt(struct usb_hcd *hcd)
return 0;
}

-/*
- * Handle the port over-current indicator change.
- */
-static void ohci_da8xx_ocic_handler(struct da8xx_ohci_root_hub *hub,
- unsigned port)
-{
- ocic_mask |= 1 << port;
-
- /* Once over-current is detected, the port needs to be powered down */
- if (hub->get_oci(port) > 0)
- hub->set_power(port, 0);
-}
-
static int ohci_da8xx_regulator_event(struct notifier_block *nb,
unsigned long event, void *data)
{
@@ -223,16 +206,23 @@ static int ohci_da8xx_regulator_event(struct notifier_block *nb,
return 0;
}

+static irqreturn_t ohci_da8xx_oc_handler(int irq, void *data)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci = data;
+
+ if (gpiod_get_value(da8xx_ohci->oc_gpio))
+ gpiod_set_value(da8xx_ohci->vbus_gpio, 0);
+
+ return IRQ_HANDLED;
+}
+
static int ohci_da8xx_register_notify(struct usb_hcd *hcd)
{
struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
struct device *dev = hcd->self.controller;
- struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
int ret = 0;

- if (hub && hub->ocic_notify) {
- ret = hub->ocic_notify(ohci_da8xx_ocic_handler);
- } else if (da8xx_ohci->vbus_reg) {
+ if (!da8xx_ohci->oc_gpio && da8xx_ohci->vbus_reg) {
da8xx_ohci->nb.notifier_call = ohci_da8xx_regulator_event;
ret = devm_regulator_register_notifier(da8xx_ohci->vbus_reg,
&da8xx_ohci->nb);
@@ -244,15 +234,6 @@ static int ohci_da8xx_register_notify(struct usb_hcd *hcd)
return ret;
}

-static void ohci_da8xx_unregister_notify(struct usb_hcd *hcd)
-{
- struct device *dev = hcd->self.controller;
- struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
-
- if (hub && hub->ocic_notify)
- hub->ocic_notify(NULL);
-}
-
static int ohci_da8xx_reset(struct usb_hcd *hcd)
{
struct device *dev = hcd->self.controller;
@@ -403,9 +384,9 @@ static int ohci_da8xx_probe(struct platform_device *pdev)
{
struct da8xx_ohci_hcd *da8xx_ohci;
struct device *dev = &pdev->dev;
+ int error, hcd_irq, oc_irq;
struct usb_hcd *hcd;
struct resource *mem;
- int error, irq;

hcd = usb_create_hcd(&ohci_da8xx_hc_driver, dev, dev_name(dev));
if (!hcd)
@@ -443,6 +424,27 @@ static int ohci_da8xx_probe(struct platform_device *pdev)
}
}

+ da8xx_ohci->vbus_gpio = devm_gpiod_get_optional(dev, "vbus",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(da8xx_ohci->vbus_gpio))
+ goto err;
+
+ da8xx_ohci->oc_gpio = devm_gpiod_get_optional(dev, "oc", GPIOD_IN);
+ if (IS_ERR(da8xx_ohci->oc_gpio))
+ goto err;
+
+ if (da8xx_ohci->oc_gpio) {
+ oc_irq = gpiod_to_irq(da8xx_ohci->oc_gpio);
+ if (oc_irq < 0)
+ goto err;
+
+ error = devm_request_irq(dev, oc_irq, ohci_da8xx_oc_handler,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ "OHCI over-current indicator", da8xx_ohci);
+ if (error)
+ goto err;
+ }
+
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
hcd->regs = devm_ioremap_resource(dev, mem);
if (IS_ERR(hcd->regs)) {
@@ -452,13 +454,13 @@ static int ohci_da8xx_probe(struct platform_device *pdev)
hcd->rsrc_start = mem->start;
hcd->rsrc_len = resource_size(mem);

- irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
+ hcd_irq = platform_get_irq(pdev, 0);
+ if (hcd_irq < 0) {
error = -ENODEV;
goto err;
}

- error = usb_add_hcd(hcd, irq, 0);
+ error = usb_add_hcd(hcd, hcd_irq, 0);
if (error)
goto err;

@@ -481,7 +483,6 @@ static int ohci_da8xx_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);

- ohci_da8xx_unregister_notify(hcd);
usb_remove_hcd(hcd);
usb_put_hcd(hcd);

--
2.20.1
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