2 * ulpi.c - USB ULPI PHY bus
4 * Copyright (C) 2015 Intel Corporation
6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/ulpi/interface.h>
14 #include <linux/ulpi/driver.h>
15 #include <linux/ulpi/regs.h>
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/acpi.h>
20 #include <linux/of_device.h>
21 #include <linux/clk/clk-conf.h>
23 /* -------------------------------------------------------------------------- */
25 int ulpi_read(struct ulpi *ulpi, u8 addr)
27 return ulpi->ops->read(ulpi->dev.parent, addr);
29 EXPORT_SYMBOL_GPL(ulpi_read);
31 int ulpi_write(struct ulpi *ulpi, u8 addr, u8 val)
33 return ulpi->ops->write(ulpi->dev.parent, addr, val);
35 EXPORT_SYMBOL_GPL(ulpi_write);
37 /* -------------------------------------------------------------------------- */
39 static int ulpi_match(struct device *dev, struct device_driver *driver)
41 struct ulpi_driver *drv = to_ulpi_driver(driver);
42 struct ulpi *ulpi = to_ulpi_dev(dev);
43 const struct ulpi_device_id *id;
46 * Some ULPI devices don't have a vendor id
47 * or provide an id_table so rely on OF match.
49 if (ulpi->id.vendor == 0 || !drv->id_table)
50 return of_driver_match_device(dev, driver);
52 for (id = drv->id_table; id->vendor; id++)
53 if (id->vendor == ulpi->id.vendor &&
54 id->product == ulpi->id.product)
60 static int ulpi_uevent(struct device *dev, struct kobj_uevent_env *env)
62 struct ulpi *ulpi = to_ulpi_dev(dev);
65 ret = of_device_uevent_modalias(dev, env);
69 if (add_uevent_var(env, "MODALIAS=ulpi:v%04xp%04x",
70 ulpi->id.vendor, ulpi->id.product))
75 static int ulpi_probe(struct device *dev)
77 struct ulpi_driver *drv = to_ulpi_driver(dev->driver);
80 ret = of_clk_set_defaults(dev->of_node, false);
84 return drv->probe(to_ulpi_dev(dev));
87 static int ulpi_remove(struct device *dev)
89 struct ulpi_driver *drv = to_ulpi_driver(dev->driver);
92 drv->remove(to_ulpi_dev(dev));
97 static struct bus_type ulpi_bus = {
100 .uevent = ulpi_uevent,
102 .remove = ulpi_remove,
105 /* -------------------------------------------------------------------------- */
107 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
111 struct ulpi *ulpi = to_ulpi_dev(dev);
113 len = of_device_modalias(dev, buf, PAGE_SIZE);
117 return sprintf(buf, "ulpi:v%04xp%04x\n",
118 ulpi->id.vendor, ulpi->id.product);
120 static DEVICE_ATTR_RO(modalias);
122 static struct attribute *ulpi_dev_attrs[] = {
123 &dev_attr_modalias.attr,
127 static struct attribute_group ulpi_dev_attr_group = {
128 .attrs = ulpi_dev_attrs,
131 static const struct attribute_group *ulpi_dev_attr_groups[] = {
132 &ulpi_dev_attr_group,
136 static void ulpi_dev_release(struct device *dev)
138 of_node_put(dev->of_node);
139 kfree(to_ulpi_dev(dev));
142 static const struct device_type ulpi_dev_type = {
143 .name = "ulpi_device",
144 .groups = ulpi_dev_attr_groups,
145 .release = ulpi_dev_release,
148 /* -------------------------------------------------------------------------- */
151 * ulpi_register_driver - register a driver with the ULPI bus
152 * @drv: driver being registered
154 * Registers a driver with the ULPI bus.
156 int __ulpi_register_driver(struct ulpi_driver *drv, struct module *module)
161 drv->driver.owner = module;
162 drv->driver.bus = &ulpi_bus;
164 return driver_register(&drv->driver);
166 EXPORT_SYMBOL_GPL(__ulpi_register_driver);
169 * ulpi_unregister_driver - unregister a driver with the ULPI bus
170 * @drv: driver to unregister
172 * Unregisters a driver with the ULPI bus.
174 void ulpi_unregister_driver(struct ulpi_driver *drv)
176 driver_unregister(&drv->driver);
178 EXPORT_SYMBOL_GPL(ulpi_unregister_driver);
180 /* -------------------------------------------------------------------------- */
182 static int ulpi_of_register(struct ulpi *ulpi)
184 struct device_node *np = NULL, *child;
185 struct device *parent;
187 /* Find a ulpi bus underneath the parent or the grandparent */
188 parent = ulpi->dev.parent;
190 np = of_get_child_by_name(parent->of_node, "ulpi");
191 else if (parent->parent && parent->parent->of_node)
192 np = of_get_child_by_name(parent->parent->of_node, "ulpi");
196 child = of_get_next_available_child(np, NULL);
201 ulpi->dev.of_node = child;
206 static int ulpi_read_id(struct ulpi *ulpi)
210 /* Test the interface */
211 ret = ulpi_write(ulpi, ULPI_SCRATCH, 0xaa);
215 ret = ulpi_read(ulpi, ULPI_SCRATCH);
222 ulpi->id.vendor = ulpi_read(ulpi, ULPI_VENDOR_ID_LOW);
223 ulpi->id.vendor |= ulpi_read(ulpi, ULPI_VENDOR_ID_HIGH) << 8;
225 ulpi->id.product = ulpi_read(ulpi, ULPI_PRODUCT_ID_LOW);
226 ulpi->id.product |= ulpi_read(ulpi, ULPI_PRODUCT_ID_HIGH) << 8;
228 /* Some ULPI devices don't have a vendor id so rely on OF match */
229 if (ulpi->id.vendor == 0)
232 request_module("ulpi:v%04xp%04x", ulpi->id.vendor, ulpi->id.product);
235 of_device_request_module(&ulpi->dev);
239 static int ulpi_register(struct device *dev, struct ulpi *ulpi)
243 ulpi->dev.parent = dev; /* needed early for ops */
244 ulpi->dev.bus = &ulpi_bus;
245 ulpi->dev.type = &ulpi_dev_type;
246 dev_set_name(&ulpi->dev, "%s.ulpi", dev_name(dev));
248 ACPI_COMPANION_SET(&ulpi->dev, ACPI_COMPANION(dev));
250 ret = ulpi_of_register(ulpi);
254 ret = ulpi_read_id(ulpi);
256 of_node_put(ulpi->dev.of_node);
260 ret = device_register(&ulpi->dev);
262 put_device(&ulpi->dev);
266 dev_dbg(&ulpi->dev, "registered ULPI PHY: vendor %04x, product %04x\n",
267 ulpi->id.vendor, ulpi->id.product);
273 * ulpi_register_interface - instantiate new ULPI device
274 * @dev: USB controller's device interface
275 * @ops: ULPI register access
277 * Allocates and registers a ULPI device and an interface for it. Called from
278 * the USB controller that provides the ULPI interface.
280 struct ulpi *ulpi_register_interface(struct device *dev,
281 const struct ulpi_ops *ops)
286 ulpi = kzalloc(sizeof(*ulpi), GFP_KERNEL);
288 return ERR_PTR(-ENOMEM);
292 ret = ulpi_register(dev, ulpi);
300 EXPORT_SYMBOL_GPL(ulpi_register_interface);
303 * ulpi_unregister_interface - unregister ULPI interface
304 * @intrf: struct ulpi_interface
306 * Unregisters a ULPI device and it's interface that was created with
307 * ulpi_create_interface().
309 void ulpi_unregister_interface(struct ulpi *ulpi)
311 device_unregister(&ulpi->dev);
313 EXPORT_SYMBOL_GPL(ulpi_unregister_interface);
315 /* -------------------------------------------------------------------------- */
317 static int __init ulpi_init(void)
319 return bus_register(&ulpi_bus);
321 subsys_initcall(ulpi_init);
323 static void __exit ulpi_exit(void)
325 bus_unregister(&ulpi_bus);
327 module_exit(ulpi_exit);
329 MODULE_AUTHOR("Intel Corporation");
330 MODULE_LICENSE("GPL v2");
331 MODULE_DESCRIPTION("USB ULPI PHY bus");