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>
This commit is contained in:
Robert Jarzmik
Felipe Balbi
parent
7bdea87a87
commit
7acc9973e3
3 changed files with 98 additions and 1 deletions
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@ -27,6 +27,7 @@
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/usb_phy_generic.h>
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#include <linux/slab.h>
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@ -39,6 +40,9 @@
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#include "phy-generic.h"
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#define VBUS_IRQ_FLAGS \
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(IRQF_SHARED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
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struct platform_device *usb_phy_generic_register(void)
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{
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return platform_device_register_simple("usb_phy_generic",
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@ -66,6 +70,73 @@ static void nop_reset_set(struct usb_phy_generic *nop, int asserted)
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usleep_range(10000, 20000);
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}
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/* interface to regulator framework */
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static void nop_set_vbus_draw(struct usb_phy_generic *nop, unsigned mA)
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{
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struct regulator *vbus_draw = nop->vbus_draw;
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int enabled;
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int ret;
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if (!vbus_draw)
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return;
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enabled = nop->vbus_draw_enabled;
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if (mA) {
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regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
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if (!enabled) {
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ret = regulator_enable(vbus_draw);
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if (ret < 0)
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return;
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nop->vbus_draw_enabled = 1;
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}
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} else {
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if (enabled) {
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ret = regulator_disable(vbus_draw);
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if (ret < 0)
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return;
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nop->vbus_draw_enabled = 0;
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}
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}
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nop->mA = mA;
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}
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static irqreturn_t nop_gpio_vbus_thread(int irq, void *data)
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{
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struct usb_phy_generic *nop = data;
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struct usb_otg *otg = nop->phy.otg;
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int vbus, status;
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vbus = gpiod_get_value(nop->gpiod_vbus);
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if ((vbus ^ nop->vbus) == 0)
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return IRQ_HANDLED;
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nop->vbus = vbus;
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if (vbus) {
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status = USB_EVENT_VBUS;
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otg->state = OTG_STATE_B_PERIPHERAL;
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nop->phy.last_event = status;
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usb_gadget_vbus_connect(otg->gadget);
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/* drawing a "unit load" is *always* OK, except for OTG */
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nop_set_vbus_draw(nop, 100);
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atomic_notifier_call_chain(&nop->phy.notifier, status,
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otg->gadget);
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} else {
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nop_set_vbus_draw(nop, 0);
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usb_gadget_vbus_disconnect(otg->gadget);
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status = USB_EVENT_NONE;
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otg->state = OTG_STATE_B_IDLE;
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nop->phy.last_event = status;
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atomic_notifier_call_chain(&nop->phy.notifier, status,
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otg->gadget);
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}
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return IRQ_HANDLED;
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}
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int usb_gen_phy_init(struct usb_phy *phy)
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{
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struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
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@ -149,17 +220,23 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
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needs_vcc = of_property_read_bool(node, "vcc-supply");
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nop->gpiod_reset = devm_gpiod_get(dev, "reset-gpios");
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err = PTR_ERR(nop->gpiod_reset);
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if (!err) {
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nop->gpiod_vbus = devm_gpiod_get(dev,
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"vbus-detect-gpio");
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err = PTR_ERR(nop->gpiod_vbus);
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}
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} else if (pdata) {
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type = pdata->type;
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clk_rate = pdata->clk_rate;
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needs_vcc = pdata->needs_vcc;
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if (gpio_is_valid(gpio->gpio_reset)) {
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if (gpio_is_valid(pdata->gpio_reset)) {
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err = devm_gpio_request_one(dev, pdata->gpio_reset, 0,
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dev_name(dev));
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if (!err)
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nop->gpiod_reset =
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gpio_to_desc(pdata->gpio_reset);
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}
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nop->gpiod_vbus = pdata->gpiod_vbus;
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}
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if (err == -EPROBE_DEFER)
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@ -224,6 +301,18 @@ static int usb_phy_generic_probe(struct platform_device *pdev)
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err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev));
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if (err)
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return err;
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if (nop->gpiod_vbus) {
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err = devm_request_threaded_irq(&pdev->dev,
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gpiod_to_irq(nop->gpiod_vbus),
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NULL, nop_gpio_vbus_thread,
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VBUS_IRQ_FLAGS, "vbus_detect",
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nop);
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if (err) {
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dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
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gpiod_to_irq(nop->gpiod_vbus), err);
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return err;
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}
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}
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nop->phy.init = usb_gen_phy_init;
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nop->phy.shutdown = usb_gen_phy_shutdown;
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@ -3,6 +3,7 @@
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#include <linux/usb/usb_phy_generic.h>
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#include <linux/gpio/consumer.h>
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#include <linux/regulator/consumer.h>
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struct usb_phy_generic {
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struct usb_phy phy;
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@ -10,6 +11,11 @@ struct usb_phy_generic {
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struct clk *clk;
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struct regulator *vcc;
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struct gpio_desc *gpiod_reset;
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struct gpio_desc *gpiod_vbus;
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struct regulator *vbus_draw;
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bool vbus_draw_enabled;
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unsigned long mA;
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unsigned int vbus;
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};
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int usb_gen_phy_init(struct usb_phy *phy);
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@ -2,6 +2,7 @@
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#define __LINUX_USB_NOP_XCEIV_H
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#include <linux/usb/otg.h>
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#include <linux/gpio/consumer.h>
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struct usb_phy_generic_platform_data {
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enum usb_phy_type type;
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@ -11,6 +12,7 @@ struct usb_phy_generic_platform_data {
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unsigned int needs_vcc:1;
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unsigned int needs_reset:1; /* deprecated */
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int gpio_reset;
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struct gpio_desc *gpiod_vbus;
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};
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#if IS_ENABLED(CONFIG_NOP_USB_XCEIV)
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