From: Axel Haslam Date: Wed, 23 Nov 2016 18:06:47 +0000 (+0100) Subject: USB: ohci: da8xx: Allow a regulator to handle VBUS X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c844ff74b04fe83245c908a8c92f0a7620b25c4c;p=linux-beck.git USB: ohci: da8xx: Allow a regulator to handle VBUS Using a regulator to handle VBUS will eliminate the need for platform data and callbacks, and make the driver more generic allowing different types of regulators to handle VBUS. The regulator equivalents to the platform callbacks are: set_power -> regulator_enable/regulator_disable get_power -> regulator_is_enabled get_oci -> regulator_get_error_flags ocic_notify -> regulator event notification Signed-off-by: Axel Haslam Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/ohci-da8xx.c b/drivers/usb/host/ohci-da8xx.c index 90763ad5c4eb..2b9cb2e67de3 100644 --- a/drivers/usb/host/ohci-da8xx.c +++ b/drivers/usb/host/ohci-da8xx.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -36,8 +37,12 @@ static int (*orig_ohci_hub_control)(struct usb_hcd *hcd, u16 typeReq, static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf); struct da8xx_ohci_hcd { + struct usb_hcd *hcd; struct clk *usb11_clk; struct phy *usb11_phy; + struct regulator *vbus_reg; + struct notifier_block nb; + unsigned int reg_enabled; }; #define to_da8xx_ohci(hcd) (struct da8xx_ohci_hcd *)(hcd_to_ohci(hcd)->priv) @@ -83,56 +88,103 @@ 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); + int ret; if (hub && hub->set_power) return hub->set_power(1, on); + if (!da8xx_ohci->vbus_reg) + return 0; + + if (on && !da8xx_ohci->reg_enabled) { + ret = regulator_enable(da8xx_ohci->vbus_reg); + if (ret) { + dev_err(dev, "Failed to enable regulator: %d\n", ret); + return ret; + } + da8xx_ohci->reg_enabled = 1; + + } else if (!on && da8xx_ohci->reg_enabled) { + ret = regulator_disable(da8xx_ohci->vbus_reg); + if (ret) { + dev_err(dev, "Failed to disable regulator: %d\n", ret); + return ret; + } + da8xx_ohci->reg_enabled = 0; + } + return 0; } 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_reg) + return regulator_is_enabled(da8xx_ohci->vbus_reg); + return 1; } 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->vbus_reg) + return 0; + + ret = regulator_get_error_flags(da8xx_ohci->vbus_reg, &flags); + if (ret) + return ret; + + if (flags & REGULATOR_ERROR_OVER_CURRENT) + return 1; + return 0; } 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) return 1; + if (da8xx_ohci->vbus_reg) + return 1; + return 0; } 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) return 1; + if (da8xx_ohci->vbus_reg) + return 1; + return 0; } @@ -160,15 +212,39 @@ static void ohci_da8xx_ocic_handler(struct da8xx_ohci_root_hub *hub, hub->set_power(port, 0); } +static int ohci_da8xx_regulator_event(struct notifier_block *nb, + unsigned long event, void *data) +{ + struct da8xx_ohci_hcd *da8xx_ohci = + container_of(nb, struct da8xx_ohci_hcd, nb); + + if (event & REGULATOR_EVENT_OVER_CURRENT) { + ocic_mask |= 1 << 1; + ohci_da8xx_set_power(da8xx_ohci->hcd, 0); + } + + return 0; +} + 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) { + da8xx_ohci->nb.notifier_call = ohci_da8xx_regulator_event; + ret = devm_regulator_register_notifier(da8xx_ohci->vbus_reg, + &da8xx_ohci->nb); + } - if (hub && hub->ocic_notify) - return hub->ocic_notify(ohci_da8xx_ocic_handler); + if (ret) + dev_err(dev, "Failed to register notifier: %d\n", ret); - return 0; + return ret; } static void ohci_da8xx_unregister_notify(struct usb_hcd *hcd) @@ -331,6 +407,7 @@ static int ohci_da8xx_probe(struct platform_device *pdev) return -ENOMEM; da8xx_ohci = to_da8xx_ohci(hcd); + da8xx_ohci->hcd = hcd; da8xx_ohci->usb11_clk = devm_clk_get(&pdev->dev, "usb11"); if (IS_ERR(da8xx_ohci->usb11_clk)) { @@ -348,6 +425,19 @@ static int ohci_da8xx_probe(struct platform_device *pdev) goto err; } + da8xx_ohci->vbus_reg = devm_regulator_get_optional(&pdev->dev, "vbus"); + if (IS_ERR(da8xx_ohci->vbus_reg)) { + error = PTR_ERR(da8xx_ohci->vbus_reg); + if (error == -ENODEV) { + da8xx_ohci->vbus_reg = NULL; + } else if (error == -EPROBE_DEFER) { + goto err; + } else { + dev_err(&pdev->dev, "Failed to get regulator\n"); + goto err; + } + } + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); hcd->regs = devm_ioremap_resource(&pdev->dev, mem); if (IS_ERR(hcd->regs)) {