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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /drivers/usb/common/ulpi.c
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'drivers/usb/common/ulpi.c')
-rw-r--r--drivers/usb/common/ulpi.c255
1 files changed, 255 insertions, 0 deletions
diff --git a/drivers/usb/common/ulpi.c b/drivers/usb/common/ulpi.c
new file mode 100644
index 000000000..01c0c0477
--- /dev/null
+++ b/drivers/usb/common/ulpi.c
@@ -0,0 +1,255 @@
+/**
+ * ulpi.c - USB ULPI PHY bus
+ *
+ * Copyright (C) 2015 Intel Corporation
+ *
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ *
+ * 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 <linux/ulpi/interface.h>
+#include <linux/ulpi/driver.h>
+#include <linux/ulpi/regs.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+
+/* -------------------------------------------------------------------------- */
+
+int ulpi_read(struct ulpi *ulpi, u8 addr)
+{
+ return ulpi->ops->read(ulpi->ops, addr);
+}
+EXPORT_SYMBOL_GPL(ulpi_read);
+
+int ulpi_write(struct ulpi *ulpi, u8 addr, u8 val)
+{
+ return ulpi->ops->write(ulpi->ops, 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)
+{
+ if (!drv->probe)
+ return -EINVAL;
+
+ 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;
+
+ /* 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.parent = dev;
+ 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, struct ulpi_ops *ops)
+{
+ struct ulpi *ulpi;
+ int ret;
+
+ ulpi = kzalloc(sizeof(*ulpi), GFP_KERNEL);
+ if (!ulpi)
+ return ERR_PTR(-ENOMEM);
+
+ ulpi->ops = ops;
+ ops->dev = dev;
+
+ 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");