platform_set_drvdata(pdev, usb_phy);
static int exynos3830_usb_probe(struct platform_device *pdev) { struct exynos3830_usb_phy *usb_phy; int ret; exynos 3830 usb driver work
usb_phy = platform_get_drvdata(pdev); if (usb_phy) { usb_deregister_dev(pdev); usb_phy_put(usb_phy->phy); kfree(usb_phy); } usb_phy = platform_get_drvdata(pdev)
return ret; }
The Exynos 3830 is a system-on-chip (SoC) designed by Samsung Electronics, and it includes a USB controller. To develop a proper USB driver for this chip, we need to understand the USB controller's architecture, the Exynos 3830's overall system design, and the Linux kernel's USB driver framework. if (usb_phy) { usb_deregister_dev(pdev)
return 0; }
usb_phy = kzalloc(sizeof(*usb_phy), GFP_KERNEL); if (!usb_phy) return -ENOMEM;