[U-Boot] [u-boot 05/40] usb: gadget: udc: make udc-core compile in u-boot build

[Lukasz Majewski <l.majewski@samsung.com>]

Hi Kishon,

> 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>
> ---
>  drivers/usb/gadget/udc/udc-core.c |  335
> +++---------------------------------- 1 file changed, 26
> insertions(+), 309 deletions(-)
> 
> diff --git a/drivers/usb/gadget/udc/udc-core.c
> b/drivers/usb/gadget/udc/udc-core.c index e31d574..875e998 100644
> --- a/drivers/usb/gadget/udc/udc-core.c
> +++ b/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");

Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>

-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group