diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/phy/phy-generic.c | 91 | ||||
| -rw-r--r-- | drivers/usb/phy/phy-generic.h | 6 |
2 files changed, 96 insertions, 1 deletions
diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c index d53928f3a6ea..dd05254241fb 100644 --- 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 09924fdaaabe..0d0eadd54ed9 100644 --- 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); |