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usb: phy: generic: add vbus support

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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>
This commit is contained in:
Robert Jarzmik 2014-12-06 22:05:15 +01:00 committed by Felipe Balbi
parent 7bdea87a87
commit 7acc9973e3
3 changed files with 98 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

91
drivers/usb/phy/phy-generic.c
View file

@ -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;

6
drivers/usb/phy/phy-generic.h
View file

@ -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);

2
include/linux/usb/usb_phy_generic.h
View file

@ -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)