usb: gadget: udc: make udc-core compile in u-boot build

Make udc-core compile in u-boot by removing all linux specific
stuff and having only the bare minimal udc-core required for
usb gadget drivers. Also modified the file header to a format that is
generally being used in u-boot.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>

drivers/usb/gadget/udc/udc-core.c

@@ -1,33 +1,27 @@
 /**
- * udc.c - Core UDC Framework
+ * udc-core.c - Core UDC Framework
+ *
+ * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
  *
- * Copyright (C) 2010 Texas Instruments
  * Author: Felipe Balbi <balbi@ti.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  of
- * the License as published by the Free Software Foundation.
+ * Taken from Linux Kernel v3.19-rc1 (drivers/usb/gadget/udc-core.c) and ported
+ * to uboot.
  *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * commit 02e8c96627 : usb: gadget: udc: core: prepend udc_attach_driver with
+ *		       usb_
  *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier:     GPL-2.0
  */
 
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/list.h>
-#include <linux/err.h>
-#include <linux/dma-mapping.h>
-#include <linux/workqueue.h>
+#include <linux/compat.h>
+#include <malloc.h>
+#include <asm/cache.h>
+#include <asm/dma-mapping.h>
+#include <common.h>
 
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
-#include <linux/usb.h>
 
 /**
  * struct usb_udc - describes one usb device controller
@@ -48,38 +42,18 @@ struct usb_udc {
 
 static struct class *udc_class;
 static LIST_HEAD(udc_list);
-static DEFINE_MUTEX(udc_lock);
+DEFINE_MUTEX(udc_lock);
 
 /* ------------------------------------------------------------------------- */
 
-#ifdef	CONFIG_HAS_DMA
-
 int usb_gadget_map_request(struct usb_gadget *gadget,
 		struct usb_request *req, int is_in)
 {
 	if (req->length == 0)
 		return 0;
 
-	if (req->num_sgs) {
-		int     mapped;
-
-		mapped = dma_map_sg(&gadget->dev, req->sg, req->num_sgs,
-				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-		if (mapped == 0) {
-			dev_err(&gadget->dev, "failed to map SGs\n");
-			return -EFAULT;
-		}
-
-		req->num_mapped_sgs = mapped;
-	} else {
-		req->dma = dma_map_single(&gadget->dev, req->buf, req->length,
-				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-
-		if (dma_mapping_error(&gadget->dev, req->dma)) {
-			dev_err(&gadget->dev, "failed to map buffer\n");
-			return -EFAULT;
-		}
-	}
+	req->dma = dma_map_single(req->buf, req->length,
+				  is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 
 	return 0;
 }
@@ -91,20 +65,11 @@ void usb_gadget_unmap_request(struct usb_gadget *gadget,
 	if (req->length == 0)
 		return;
 
-	if (req->num_mapped_sgs) {
-		dma_unmap_sg(&gadget->dev, req->sg, req->num_mapped_sgs,
-				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-
-		req->num_mapped_sgs = 0;
-	} else {
-		dma_unmap_single(&gadget->dev, req->dma, req->length,
-				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-	}
+	dma_unmap_single((void *)req->dma, req->length,
+			 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 }
 EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
 
-#endif	/* CONFIG_HAS_DMA */
-
 /* ------------------------------------------------------------------------- */
 
 /**
@@ -117,39 +82,16 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
 void usb_gadget_giveback_request(struct usb_ep *ep,
 		struct usb_request *req)
 {
-	if (likely(req->status == 0))
-		usb_led_activity(USB_LED_EVENT_GADGET);
-
 	req->complete(ep, req);
 }
 EXPORT_SYMBOL_GPL(usb_gadget_giveback_request);
 
 /* ------------------------------------------------------------------------- */
 
-static void usb_gadget_state_work(struct work_struct *work)
-{
-	struct usb_gadget	*gadget = work_to_gadget(work);
-	struct usb_udc		*udc = NULL;
-
-	mutex_lock(&udc_lock);
-	list_for_each_entry(udc, &udc_list, list)
-		if (udc->gadget == gadget)
-			goto found;
-	mutex_unlock(&udc_lock);
-
-	return;
-
-found:
-	mutex_unlock(&udc_lock);
-
-	sysfs_notify(&udc->dev.kobj, NULL, "state");
-}
-
 void usb_gadget_set_state(struct usb_gadget *gadget,
 		enum usb_device_state state)
 {
 	gadget->state = state;
-	schedule_work(&gadget->work);
 }
 EXPORT_SYMBOL_GPL(usb_gadget_set_state);
 
@@ -219,17 +161,9 @@ static void usb_udc_release(struct device *dev)
 	struct usb_udc *udc;
 
 	udc = container_of(dev, struct usb_udc, dev);
-	dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
 	kfree(udc);
 }
 
-static const struct attribute_group *usb_udc_attr_groups[];
-
-static void usb_udc_nop_release(struct device *dev)
-{
-	dev_vdbg(dev, "%s\n", __func__);
-}
-
 /**
  * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list
  * @parent: the parent device to this udc. Usually the controller driver's
@@ -250,59 +184,23 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
 		goto err1;
 
 	dev_set_name(&gadget->dev, "gadget");
-	INIT_WORK(&gadget->work, usb_gadget_state_work);
 	gadget->dev.parent = parent;
 
-#ifdef	CONFIG_HAS_DMA
-	dma_set_coherent_mask(&gadget->dev, parent->coherent_dma_mask);
-	gadget->dev.dma_parms = parent->dma_parms;
-	gadget->dev.dma_mask = parent->dma_mask;
-#endif
-
-	if (release)
-		gadget->dev.release = release;
-	else
-		gadget->dev.release = usb_udc_nop_release;
-
-	ret = device_register(&gadget->dev);
-	if (ret)
-		goto err2;
-
-	device_initialize(&udc->dev);
 	udc->dev.release = usb_udc_release;
 	udc->dev.class = udc_class;
-	udc->dev.groups = usb_udc_attr_groups;
 	udc->dev.parent = parent;
-	ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj));
-	if (ret)
-		goto err3;
 
 	udc->gadget = gadget;
 
 	mutex_lock(&udc_lock);
 	list_add_tail(&udc->list, &udc_list);
 
-	ret = device_add(&udc->dev);
-	if (ret)
-		goto err4;
-
 	usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
 
 	mutex_unlock(&udc_lock);
 
 	return 0;
 
-err4:
-	list_del(&udc->list);
-	mutex_unlock(&udc_lock);
-
-err3:
-	put_device(&udc->dev);
-
-err2:
-	put_device(&gadget->dev);
-	kfree(udc);
-
 err1:
 	return ret;
 }
@@ -327,16 +225,12 @@ static void usb_gadget_remove_driver(struct usb_udc *udc)
 	dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
 			udc->driver->function);
 
-	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
-
 	usb_gadget_disconnect(udc->gadget);
 	udc->driver->disconnect(udc->gadget);
 	udc->driver->unbind(udc->gadget);
 	usb_gadget_udc_stop(udc);
 
 	udc->driver = NULL;
-	udc->dev.driver = NULL;
-	udc->gadget->dev.driver = NULL;
 }
 
 /**
@@ -368,11 +262,6 @@ found:
 
 	if (udc->driver)
 		usb_gadget_remove_driver(udc);
-
-	kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
-	flush_work(&gadget->work);
-	device_unregister(&udc->dev);
-	device_unregister(&gadget->dev);
 }
 EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
 
@@ -386,10 +275,8 @@ static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *dri
 			driver->function);
 
 	udc->driver = driver;
-	udc->dev.driver = &driver->driver;
-	udc->gadget->dev.driver = &driver->driver;
 
-	ret = driver->bind(udc->gadget, driver);
+	ret = driver->bind(udc->gadget);
 	if (ret)
 		goto err1;
 	ret = usb_gadget_udc_start(udc);
@@ -399,43 +286,14 @@ static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *dri
 	}
 	usb_gadget_connect(udc->gadget);
 
-	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
 	return 0;
 err1:
 	if (ret != -EISNAM)
 		dev_err(&udc->dev, "failed to start %s: %d\n",
 			udc->driver->function, ret);
 	udc->driver = NULL;
-	udc->dev.driver = NULL;
-	udc->gadget->dev.driver = NULL;
-	return ret;
-}
-
-int usb_udc_attach_driver(const char *name, struct usb_gadget_driver *driver)
-{
-	struct usb_udc *udc = NULL;
-	int ret = -ENODEV;
-
-	mutex_lock(&udc_lock);
-	list_for_each_entry(udc, &udc_list, list) {
-		ret = strcmp(name, dev_name(&udc->dev));
-		if (!ret)
-			break;
-	}
-	if (ret) {
-		ret = -ENODEV;
-		goto out;
-	}
-	if (udc->driver) {
-		ret = -EBUSY;
-		goto out;
-	}
-	ret = udc_bind_to_driver(udc, driver);
-out:
-	mutex_unlock(&udc_lock);
 	return ret;
 }
-EXPORT_SYMBOL_GPL(usb_udc_attach_driver);
 
 int usb_gadget_probe_driver(struct usb_gadget_driver *driver)
 {
@@ -452,7 +310,7 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver)
 			goto found;
 	}
 
-	pr_debug("couldn't find an available UDC\n");
+	printf("couldn't find an available UDC\n");
 	mutex_unlock(&udc_lock);
 	return -ENODEV;
 found:
@@ -462,6 +320,12 @@ found:
 }
 EXPORT_SYMBOL_GPL(usb_gadget_probe_driver);
 
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+	return usb_gadget_probe_driver(driver);
+}
+EXPORT_SYMBOL_GPL(usb_gadget_register_driver);
+
 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 {
 	struct usb_udc		*udc = NULL;
@@ -485,153 +349,6 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 }
 EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver);
 
-/* ------------------------------------------------------------------------- */
-
-static ssize_t usb_udc_srp_store(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t n)
-{
-	struct usb_udc		*udc = container_of(dev, struct usb_udc, dev);
-
-	if (sysfs_streq(buf, "1"))
-		usb_gadget_wakeup(udc->gadget);
-
-	return n;
-}
-static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store);
-
-static ssize_t usb_udc_softconn_store(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t n)
-{
-	struct usb_udc		*udc = container_of(dev, struct usb_udc, dev);
-
-	if (!udc->driver) {
-		dev_err(dev, "soft-connect without a gadget driver\n");
-		return -EOPNOTSUPP;
-	}
-
-	if (sysfs_streq(buf, "connect")) {
-		usb_gadget_udc_start(udc);
-		usb_gadget_connect(udc->gadget);
-	} else if (sysfs_streq(buf, "disconnect")) {
-		usb_gadget_disconnect(udc->gadget);
-		udc->driver->disconnect(udc->gadget);
-		usb_gadget_udc_stop(udc);
-	} else {
-		dev_err(dev, "unsupported command '%s'\n", buf);
-		return -EINVAL;
-	}
-
-	return n;
-}
-static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store);
-
-static ssize_t state_show(struct device *dev, struct device_attribute *attr,
-			  char *buf)
-{
-	struct usb_udc		*udc = container_of(dev, struct usb_udc, dev);
-	struct usb_gadget	*gadget = udc->gadget;
-
-	return sprintf(buf, "%s\n", usb_state_string(gadget->state));
-}
-static DEVICE_ATTR_RO(state);
-
-#define USB_UDC_SPEED_ATTR(name, param)					\
-ssize_t name##_show(struct device *dev,					\
-		struct device_attribute *attr, char *buf)		\
-{									\
-	struct usb_udc *udc = container_of(dev, struct usb_udc, dev);	\
-	return snprintf(buf, PAGE_SIZE, "%s\n",				\
-			usb_speed_string(udc->gadget->param));		\
-}									\
-static DEVICE_ATTR_RO(name)
-
-static USB_UDC_SPEED_ATTR(current_speed, speed);
-static USB_UDC_SPEED_ATTR(maximum_speed, max_speed);
-
-#define USB_UDC_ATTR(name)					\
-ssize_t name##_show(struct device *dev,				\
-		struct device_attribute *attr, char *buf)	\
-{								\
-	struct usb_udc		*udc = container_of(dev, struct usb_udc, dev); \
-	struct usb_gadget	*gadget = udc->gadget;		\
-								\
-	return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name);	\
-}								\
-static DEVICE_ATTR_RO(name)
-
-static USB_UDC_ATTR(is_otg);
-static USB_UDC_ATTR(is_a_peripheral);
-static USB_UDC_ATTR(b_hnp_enable);
-static USB_UDC_ATTR(a_hnp_support);
-static USB_UDC_ATTR(a_alt_hnp_support);
-
-static struct attribute *usb_udc_attrs[] = {
-	&dev_attr_srp.attr,
-	&dev_attr_soft_connect.attr,
-	&dev_attr_state.attr,
-	&dev_attr_current_speed.attr,
-	&dev_attr_maximum_speed.attr,
-
-	&dev_attr_is_otg.attr,
-	&dev_attr_is_a_peripheral.attr,
-	&dev_attr_b_hnp_enable.attr,
-	&dev_attr_a_hnp_support.attr,
-	&dev_attr_a_alt_hnp_support.attr,
-	NULL,
-};
-
-static const struct attribute_group usb_udc_attr_group = {
-	.attrs = usb_udc_attrs,
-};
-
-static const struct attribute_group *usb_udc_attr_groups[] = {
-	&usb_udc_attr_group,
-	NULL,
-};
-
-static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env)
-{
-	struct usb_udc		*udc = container_of(dev, struct usb_udc, dev);
-	int			ret;
-
-	ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name);
-	if (ret) {
-		dev_err(dev, "failed to add uevent USB_UDC_NAME\n");
-		return ret;
-	}
-
-	if (udc->driver) {
-		ret = add_uevent_var(env, "USB_UDC_DRIVER=%s",
-				udc->driver->function);
-		if (ret) {
-			dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n");
-			return ret;
-		}
-	}
-
-	return 0;
-}
-
-static int __init usb_udc_init(void)
-{
-	udc_class = class_create(THIS_MODULE, "udc");
-	if (IS_ERR(udc_class)) {
-		pr_err("failed to create udc class --> %ld\n",
-				PTR_ERR(udc_class));
-		return PTR_ERR(udc_class);
-	}
-
-	udc_class->dev_uevent = usb_udc_uevent;
-	return 0;
-}
-subsys_initcall(usb_udc_init);
-
-static void __exit usb_udc_exit(void)
-{
-	class_destroy(udc_class);
-}
-module_exit(usb_udc_exit);
-
 MODULE_DESCRIPTION("UDC Framework");
 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 MODULE_LICENSE("GPL v2");