/** * ulpi.c - USB ULPI PHY bus * * Copyright (C) 2015 Intel Corporation * * Author: Heikki Krogerus * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include /* -------------------------------------------------------------------------- */ int ulpi_read(struct ulpi *ulpi, u8 addr) { return ulpi->ops->read(ulpi->dev.parent, addr); } EXPORT_SYMBOL_GPL(ulpi_read); int ulpi_write(struct ulpi *ulpi, u8 addr, u8 val) { return ulpi->ops->write(ulpi->dev.parent, addr, val); } EXPORT_SYMBOL_GPL(ulpi_write); /* -------------------------------------------------------------------------- */ static int ulpi_match(struct device *dev, struct device_driver *driver) { struct ulpi_driver *drv = to_ulpi_driver(driver); struct ulpi *ulpi = to_ulpi_dev(dev); const struct ulpi_device_id *id; for (id = drv->id_table; id->vendor; id++) if (id->vendor == ulpi->id.vendor && id->product == ulpi->id.product) return 1; return 0; } static int ulpi_uevent(struct device *dev, struct kobj_uevent_env *env) { struct ulpi *ulpi = to_ulpi_dev(dev); if (add_uevent_var(env, "MODALIAS=ulpi:v%04xp%04x", ulpi->id.vendor, ulpi->id.product)) return -ENOMEM; return 0; } static int ulpi_probe(struct device *dev) { struct ulpi_driver *drv = to_ulpi_driver(dev->driver); return drv->probe(to_ulpi_dev(dev)); } static int ulpi_remove(struct device *dev) { struct ulpi_driver *drv = to_ulpi_driver(dev->driver); if (drv->remove) drv->remove(to_ulpi_dev(dev)); return 0; } static struct bus_type ulpi_bus = { .name = "ulpi", .match = ulpi_match, .uevent = ulpi_uevent, .probe = ulpi_probe, .remove = ulpi_remove, }; /* -------------------------------------------------------------------------- */ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { struct ulpi *ulpi = to_ulpi_dev(dev); return sprintf(buf, "ulpi:v%04xp%04x\n", ulpi->id.vendor, ulpi->id.product); } static DEVICE_ATTR_RO(modalias); static struct attribute *ulpi_dev_attrs[] = { &dev_attr_modalias.attr, NULL }; static struct attribute_group ulpi_dev_attr_group = { .attrs = ulpi_dev_attrs, }; static const struct attribute_group *ulpi_dev_attr_groups[] = { &ulpi_dev_attr_group, NULL }; static void ulpi_dev_release(struct device *dev) { kfree(to_ulpi_dev(dev)); } static struct device_type ulpi_dev_type = { .name = "ulpi_device", .groups = ulpi_dev_attr_groups, .release = ulpi_dev_release, }; /* -------------------------------------------------------------------------- */ /** * ulpi_register_driver - register a driver with the ULPI bus * @drv: driver being registered * * Registers a driver with the ULPI bus. */ int __ulpi_register_driver(struct ulpi_driver *drv, struct module *module) { if (!drv->probe) return -EINVAL; drv->driver.owner = module; drv->driver.bus = &ulpi_bus; return driver_register(&drv->driver); } EXPORT_SYMBOL_GPL(__ulpi_register_driver); /** * ulpi_unregister_driver - unregister a driver with the ULPI bus * @drv: driver to unregister * * Unregisters a driver with the ULPI bus. */ void ulpi_unregister_driver(struct ulpi_driver *drv) { driver_unregister(&drv->driver); } EXPORT_SYMBOL_GPL(ulpi_unregister_driver); /* -------------------------------------------------------------------------- */ static int ulpi_register(struct device *dev, struct ulpi *ulpi) { int ret; ulpi->dev.parent = dev; /* needed early for ops */ /* Test the interface */ ret = ulpi_write(ulpi, ULPI_SCRATCH, 0xaa); if (ret < 0) return ret; ret = ulpi_read(ulpi, ULPI_SCRATCH); if (ret < 0) return ret; if (ret != 0xaa) return -ENODEV; ulpi->id.vendor = ulpi_read(ulpi, ULPI_VENDOR_ID_LOW); ulpi->id.vendor |= ulpi_read(ulpi, ULPI_VENDOR_ID_HIGH) << 8; ulpi->id.product = ulpi_read(ulpi, ULPI_PRODUCT_ID_LOW); ulpi->id.product |= ulpi_read(ulpi, ULPI_PRODUCT_ID_HIGH) << 8; ulpi->dev.bus = &ulpi_bus; ulpi->dev.type = &ulpi_dev_type; dev_set_name(&ulpi->dev, "%s.ulpi", dev_name(dev)); ACPI_COMPANION_SET(&ulpi->dev, ACPI_COMPANION(dev)); request_module("ulpi:v%04xp%04x", ulpi->id.vendor, ulpi->id.product); ret = device_register(&ulpi->dev); if (ret) return ret; dev_dbg(&ulpi->dev, "registered ULPI PHY: vendor %04x, product %04x\n", ulpi->id.vendor, ulpi->id.product); return 0; } /** * ulpi_register_interface - instantiate new ULPI device * @dev: USB controller's device interface * @ops: ULPI register access * * Allocates and registers a ULPI device and an interface for it. Called from * the USB controller that provides the ULPI interface. */ struct ulpi *ulpi_register_interface(struct device *dev, const struct ulpi_ops *ops) { struct ulpi *ulpi; int ret; ulpi = kzalloc(sizeof(*ulpi), GFP_KERNEL); if (!ulpi) return ERR_PTR(-ENOMEM); ulpi->ops = ops; ret = ulpi_register(dev, ulpi); if (ret) { kfree(ulpi); return ERR_PTR(ret); } return ulpi; } EXPORT_SYMBOL_GPL(ulpi_register_interface); /** * ulpi_unregister_interface - unregister ULPI interface * @intrf: struct ulpi_interface * * Unregisters a ULPI device and it's interface that was created with * ulpi_create_interface(). */ void ulpi_unregister_interface(struct ulpi *ulpi) { device_unregister(&ulpi->dev); } EXPORT_SYMBOL_GPL(ulpi_unregister_interface); /* -------------------------------------------------------------------------- */ static int __init ulpi_init(void) { return bus_register(&ulpi_bus); } subsys_initcall(ulpi_init); static void __exit ulpi_exit(void) { bus_unregister(&ulpi_bus); } module_exit(ulpi_exit); MODULE_AUTHOR("Intel Corporation"); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("USB ULPI PHY bus"); ction of_get_named_gpio() could return -ENOENT, -EPROBE_DEFER -EINVAL and so on. Currently, for the optional property "enable-gpio", we only check -EPROBE_DEFER, this is not enough since there may be misconfigured "enable-gpio" in the DTB, of_get_named_gpio() will return -EINVAL in this case, we should return immediately here. And for the optional property "gpios", we didn't check the return value, the driver will continue to the point where gpio_request_array() is called, it doesn't make sense to continue if we got -EPROBE_DEFER or -EINVAL here. This patch tries to address these two issues by properly checking the return value of of_get_named_gpio. Signed-off-by: Jisheng Zhang <jszhang@marvell.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/xen/hvc-console.h')