usb: phy: generic: add vbus support

Add support for vbus detection and power supply. This code is more or
less stolen from phy-gpio-vbus-usb.c, and aims at providing a detection
mechanism for VBus (ie. usb cable plug) based on a GPIO line, and a
power supply activation which draws current from the VBus.

[ balbi@ti.com : fix build break ]

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c
index d53928f..dd05254 100644 (file)
--- a/drivers/usb/phy/phy-generic.c
+++ b/drivers/usb/phy/phy-generic.c
@@ -27,6 +27,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
+#include <linux/usb/gadget.h>
 #include <linux/usb/otg.h>
 #include <linux/usb/usb_phy_generic.h>
 #include <linux/slab.h>
@@ -39,6 +40,9 @@
 
 #include "phy-generic.h"
 
+#define VBUS_IRQ_FLAGS \
+       (IRQF_SHARED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
+
 struct platform_device *usb_phy_generic_register(void)
 {
        return platform_device_register_simple("usb_phy_generic",
@@ -66,6 +70,73 @@ static void nop_reset_set(struct usb_phy_generic *nop, int asserted)
                usleep_range(10000, 20000);
 }
 
+/* interface to regulator framework */
+static void nop_set_vbus_draw(struct usb_phy_generic *nop, unsigned mA)
+{
+       struct regulator *vbus_draw = nop->vbus_draw;
+       int enabled;
+       int ret;
+
+       if (!vbus_draw)
+               return;
+
+       enabled = nop->vbus_draw_enabled;
+       if (mA) {
+               regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
+               if (!enabled) {
+                       ret = regulator_enable(vbus_draw);
+                       if (ret < 0)
+                               return;
+                       nop->vbus_draw_enabled = 1;
+               }
+       } else {
+               if (enabled) {
+                       ret = regulator_disable(vbus_draw);
+                       if (ret < 0)
+                               return;
+                       nop->vbus_draw_enabled = 0;
+               }
+       }
+       nop->mA = mA;
+}
+
+
+static irqreturn_t nop_gpio_vbus_thread(int irq, void *data)
+{
+       struct usb_phy_generic *nop = data;
+       struct usb_otg *otg = nop->phy.otg;
+       int vbus, status;
+
+       vbus = gpiod_get_value(nop->gpiod_vbus);
+       if ((vbus ^ nop->vbus) == 0)
+               return IRQ_HANDLED;
+       nop->vbus = vbus;
+
+       if (vbus) {
+               status = USB_EVENT_VBUS;
+               otg->state = OTG_STATE_B_PERIPHERAL;
+               nop->phy.last_event = status;
+               usb_gadget_vbus_connect(otg->gadget);
+
+               /* drawing a "unit load" is *always* OK, except for OTG */
+               nop_set_vbus_draw(nop, 100);
+
+               atomic_notifier_call_chain(&nop->phy.notifier, status,
+                                          otg->gadget);
+       } else {
+               nop_set_vbus_draw(nop, 0);
+
+               usb_gadget_vbus_disconnect(otg->gadget);
+               status = USB_EVENT_NONE;
+               otg->state = OTG_STATE_B_IDLE;
+               nop->phy.last_event = status;
+
+               atomic_notifier_call_chain(&nop->phy.notifier, status,
+                                          otg->gadget);
+       }
+       return IRQ_HANDLED;
+}
+
 int usb_gen_phy_init(struct usb_phy *phy)
 {
        struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
@@ -149,17 +220,23 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
                needs_vcc = of_property_read_bool(node, "vcc-supply");
                nop->gpiod_reset = devm_gpiod_get(dev, "reset-gpios");
                err = PTR_ERR(nop->gpiod_reset);
+               if (!err) {
+                       nop->gpiod_vbus = devm_gpiod_get(dev,
+                                                        "vbus-detect-gpio");
+                       err = PTR_ERR(nop->gpiod_vbus);
+               }
        } else if (pdata) {
                type = pdata->type;
                clk_rate = pdata->clk_rate;
                needs_vcc = pdata->needs_vcc;
-               if (gpio_is_valid(gpio->gpio_reset)) {
+               if (gpio_is_valid(pdata->gpio_reset)) {
                        err = devm_gpio_request_one(dev, pdata->gpio_reset, 0,
                                                    dev_name(dev));
                        if (!err)
                                nop->gpiod_reset =
                                        gpio_to_desc(pdata->gpio_reset);
                }
+               nop->gpiod_vbus = pdata->gpiod_vbus;
        }
 
        if (err == -EPROBE_DEFER)
@@ -224,6 +301,18 @@ static int usb_phy_generic_probe(struct platform_device *pdev)
        err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev));
        if (err)
                return err;
+       if (nop->gpiod_vbus) {
+               err = devm_request_threaded_irq(&pdev->dev,
+                                               gpiod_to_irq(nop->gpiod_vbus),
+                                               NULL, nop_gpio_vbus_thread,
+                                               VBUS_IRQ_FLAGS, "vbus_detect",
+                                               nop);
+               if (err) {
+                       dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
+                               gpiod_to_irq(nop->gpiod_vbus), err);
+                       return err;
+               }
+       }
 
        nop->phy.init           = usb_gen_phy_init;
        nop->phy.shutdown       = usb_gen_phy_shutdown;

diff --git a/drivers/usb/phy/phy-generic.h b/drivers/usb/phy/phy-generic.h
index 09924fd..0d0eadd 100644 (file)
--- a/drivers/usb/phy/phy-generic.h
+++ b/drivers/usb/phy/phy-generic.h
@@ -3,6 +3,7 @@
 
 #include <linux/usb/usb_phy_generic.h>
 #include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
 
 struct usb_phy_generic {
        struct usb_phy phy;
@@ -10,6 +11,11 @@ struct usb_phy_generic {
        struct clk *clk;
        struct regulator *vcc;
        struct gpio_desc *gpiod_reset;
+       struct gpio_desc *gpiod_vbus;
+       struct regulator *vbus_draw;
+       bool vbus_draw_enabled;
+       unsigned long mA;
+       unsigned int vbus;
 };
 
 int usb_gen_phy_init(struct usb_phy *phy);

diff --git a/include/linux/usb/usb_phy_generic.h b/include/linux/usb/usb_phy_generic.h
index 68adae8..c13632d 100644 (file)
--- a/include/linux/usb/usb_phy_generic.h
+++ b/include/linux/usb/usb_phy_generic.h
@@ -2,6 +2,7 @@
 #define __LINUX_USB_NOP_XCEIV_H
 
 #include <linux/usb/otg.h>
+#include <linux/gpio/consumer.h>
 
 struct usb_phy_generic_platform_data {
        enum usb_phy_type type;
@@ -11,6 +12,7 @@ struct usb_phy_generic_platform_data {
        unsigned int needs_vcc:1;
        unsigned int needs_reset:1;     /* deprecated */
        int gpio_reset;
+       struct gpio_desc *gpiod_vbus;
 };
 
 #if IS_ENABLED(CONFIG_NOP_USB_XCEIV)