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c123905f5c
The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is (mostly) ignored and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new() which already returns void. Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20230319092428.283054-3-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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/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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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/usb/of.h>
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#include "phy-am335x-control.h"
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#include "phy-generic.h"
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struct am335x_phy {
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struct usb_phy_generic usb_phy_gen;
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struct phy_control *phy_ctrl;
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int id;
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enum usb_dr_mode dr_mode;
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};
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static int am335x_init(struct usb_phy *phy)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
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return 0;
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}
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static void am335x_shutdown(struct usb_phy *phy)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
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}
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static int am335x_phy_probe(struct platform_device *pdev)
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{
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struct am335x_phy *am_phy;
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struct device *dev = &pdev->dev;
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int ret;
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am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
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if (!am_phy)
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return -ENOMEM;
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am_phy->phy_ctrl = am335x_get_phy_control(dev);
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if (!am_phy->phy_ctrl)
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return -EPROBE_DEFER;
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am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
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if (am_phy->id < 0) {
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dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
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return am_phy->id;
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}
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am_phy->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);
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ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen);
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if (ret)
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return ret;
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am_phy->usb_phy_gen.phy.init = am335x_init;
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am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
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platform_set_drvdata(pdev, am_phy);
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device_init_wakeup(dev, true);
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/*
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* If we leave PHY wakeup enabled then AM33XX wakes up
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* immediately from DS0. To avoid this we mark dev->power.can_wakeup
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* to false. The same is checked in suspend routine to decide
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* on whether to enable PHY wakeup or not.
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* PHY wakeup works fine in standby mode, there by allowing us to
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* handle remote wakeup, wakeup on disconnect and connect.
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*/
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device_set_wakeup_enable(dev, false);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
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return usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
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}
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static void am335x_phy_remove(struct platform_device *pdev)
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{
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struct am335x_phy *am_phy = platform_get_drvdata(pdev);
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usb_remove_phy(&am_phy->usb_phy_gen.phy);
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}
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#ifdef CONFIG_PM_SLEEP
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static int am335x_phy_suspend(struct device *dev)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(dev);
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/*
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* Enable phy wakeup only if dev->power.can_wakeup is true.
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* Make sure to enable wakeup to support remote wakeup in
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* standby mode ( same is not supported in OFF(DS0) mode).
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* Enable it by doing
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* echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
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*/
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if (device_may_wakeup(dev))
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phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
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return 0;
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}
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static int am335x_phy_resume(struct device *dev)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(dev);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
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if (device_may_wakeup(dev))
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phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
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static const struct of_device_id am335x_phy_ids[] = {
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{ .compatible = "ti,am335x-usb-phy" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, am335x_phy_ids);
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static struct platform_driver am335x_phy_driver = {
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.probe = am335x_phy_probe,
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.remove_new = am335x_phy_remove,
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.driver = {
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.name = "am335x-phy-driver",
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.pm = &am335x_pm_ops,
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.of_match_table = am335x_phy_ids,
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},
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};
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module_platform_driver(am335x_phy_driver);
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MODULE_LICENSE("GPL v2");
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