3  * ulpi.c - USB ULPI PHY bus
10 #include <linux/ulpi/interface.h>
11 #include <linux/ulpi/driver.h>
12 #include <linux/ulpi/regs.h>
22 int ulpi_read(struct ulpi *ulpi, u8 addr)  in ulpi_read()  argument
24 	return ulpi->ops->read(ulpi->dev.parent, addr);  in ulpi_read()
28 int ulpi_write(struct ulpi *ulpi, u8 addr, u8 val)  in ulpi_write()  argument
30 	return ulpi->ops->write(ulpi->dev.parent, addr, val);  in ulpi_write()
39 	struct ulpi *ulpi = to_ulpi_dev(dev);  in ulpi_match()  local
42 	/* Some ULPI devices don't have a vendor id so rely on OF match */  in ulpi_match()
43 	if (ulpi->id.vendor == 0)  in ulpi_match()
47 		if (id->vendor == ulpi->id.vendor &&  in ulpi_match()
48 		    id->product == ulpi->id.product)  in ulpi_match()
56 	struct ulpi *ulpi = to_ulpi_dev(dev);  in ulpi_uevent()  local
63 	if (add_uevent_var(env, "MODALIAS=ulpi:v%04xp%04x",  in ulpi_uevent()
64 			   ulpi->id.vendor, ulpi->id.product))  in ulpi_uevent()
90 	.name = "ulpi",
103 	struct ulpi *ulpi = to_ulpi_dev(dev);  in modalias_show()  local
109 	return sprintf(buf, "ulpi:v%04xp%04x\n",  in modalias_show()
110 		       ulpi->id.vendor, ulpi->id.product);  in modalias_show()
142  * __ulpi_register_driver - register a driver with the ULPI bus
146  * Registers a driver with the ULPI bus.
161  * ulpi_unregister_driver - unregister a driver with the ULPI bus
164  * Unregisters a driver with the ULPI bus.
174 static int ulpi_of_register(struct ulpi *ulpi)  in ulpi_of_register()  argument
179 	/* Find a ulpi bus underneath the parent or the grandparent */  in ulpi_of_register()
180 	parent = ulpi->dev.parent;  in ulpi_of_register()
182 		np = of_get_child_by_name(parent->of_node, "ulpi");  in ulpi_of_register()
184 		np = of_get_child_by_name(parent->parent->of_node, "ulpi");  in ulpi_of_register()
193 	ulpi->dev.of_node = child;  in ulpi_of_register()
198 static int ulpi_read_id(struct ulpi *ulpi)  in ulpi_read_id()  argument
203 	ret = ulpi_write(ulpi, ULPI_SCRATCH, 0xaa);  in ulpi_read_id()
207 	ret = ulpi_read(ulpi, ULPI_SCRATCH);  in ulpi_read_id()
214 	ulpi->id.vendor = ulpi_read(ulpi, ULPI_VENDOR_ID_LOW);  in ulpi_read_id()
215 	ulpi->id.vendor |= ulpi_read(ulpi, ULPI_VENDOR_ID_HIGH) << 8;  in ulpi_read_id()
217 	ulpi->id.product = ulpi_read(ulpi, ULPI_PRODUCT_ID_LOW);  in ulpi_read_id()
218 	ulpi->id.product |= ulpi_read(ulpi, ULPI_PRODUCT_ID_HIGH) << 8;  in ulpi_read_id()
220 	/* Some ULPI devices don't have a vendor id so rely on OF match */  in ulpi_read_id()
221 	if (ulpi->id.vendor == 0)  in ulpi_read_id()
224 	request_module("ulpi:v%04xp%04x", ulpi->id.vendor, ulpi->id.product);  in ulpi_read_id()
227 	of_device_request_module(&ulpi->dev);  in ulpi_read_id()
231 static int ulpi_register(struct device *dev, struct ulpi *ulpi)  in ulpi_register()  argument
235 	ulpi->dev.parent = dev; /* needed early for ops */  in ulpi_register()
236 	ulpi->dev.bus = &ulpi_bus;  in ulpi_register()
237 	ulpi->dev.type = &ulpi_dev_type;  in ulpi_register()
238 	dev_set_name(&ulpi->dev, "%s.ulpi", dev_name(dev));  in ulpi_register()
240 	ACPI_COMPANION_SET(&ulpi->dev, ACPI_COMPANION(dev));  in ulpi_register()
242 	ret = ulpi_of_register(ulpi);  in ulpi_register()
246 	ret = ulpi_read_id(ulpi);  in ulpi_register()
250 	ret = device_register(&ulpi->dev);  in ulpi_register()
254 	dev_dbg(&ulpi->dev, "registered ULPI PHY: vendor %04x, product %04x\n",  in ulpi_register()
255 		ulpi->id.vendor, ulpi->id.product);  in ulpi_register()
261  * ulpi_register_interface - instantiate new ULPI device
263  * @ops: ULPI register access
265  * Allocates and registers a ULPI device and an interface for it. Called from
266  * the USB controller that provides the ULPI interface.
268 struct ulpi *ulpi_register_interface(struct device *dev,  in ulpi_register_interface()
271 	struct ulpi *ulpi;  in ulpi_register_interface()  local
274 	ulpi = kzalloc(sizeof(*ulpi), GFP_KERNEL);  in ulpi_register_interface()
275 	if (!ulpi)  in ulpi_register_interface()
278 	ulpi->ops = ops;  in ulpi_register_interface()
280 	ret = ulpi_register(dev, ulpi);  in ulpi_register_interface()
282 		kfree(ulpi);  in ulpi_register_interface()
286 	return ulpi;  in ulpi_register_interface()
291  * ulpi_unregister_interface - unregister ULPI interface
292  * @ulpi: struct ulpi_interface
294  * Unregisters a ULPI device and it's interface that was created with
297 void ulpi_unregister_interface(struct ulpi *ulpi)  in ulpi_unregister_interface()  argument
299 	of_node_put(ulpi->dev.of_node);  in ulpi_unregister_interface()
300 	device_unregister(&ulpi->dev);  in ulpi_unregister_interface()
320 MODULE_DESCRIPTION("USB ULPI PHY bus");