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Commit 2afc0804 authored by Hemant Kumar's avatar Hemant Kumar Committed by Jack Pham
Browse files

usb: gadget: add configfs support in ccid function driver 



This allows ccid device to enumerate using usb compostiion
driver supporting config file system. Also fix compilation
errors.

Change-Id: I363b8f967781ab162fbd7ded0b397c86cf3d3fc5
Signed-off-by: default avatarHemant Kumar <hemantk@codeaurora.org>
parent d5de1787

drivers/usb/gadget/function/f_ccid.c

+149 −43
Original line number Diff line number Diff line
@@ -17,8 +17,11 @@ 
#include <linux/kernel.h>

#include <linux/device.h>

#include <linux/fs.h>

#include <linux/module.h>

#include <linux/usb/ccid_desc.h>

#include <linux/usb/composite.h>

#include <linux/miscdevice.h>

#include <linux/uaccess.h>



#include "f_ccid.h"
@@ -26,6 +29,9 @@ 
#define BULK_OUT_BUFFER_SIZE sizeof(struct ccid_bulk_out_header)

#define CTRL_BUF_SIZE	4

#define FUNCTION_NAME	"ccid"

#define MAX_INST_NAME_LEN	40

#define CCID_CTRL_DEV_NAME	"ccid_ctrl"

#define CCID_BULK_DEV_NAME	"ccid_bulk"

#define CCID_NOTIFY_INTERVAL	5

#define CCID_NOTIFY_MAXPACKET	4
@@ -38,6 +44,7 @@ struct ccid_ctrl_dev { 
	wait_queue_head_t tx_wait_q;

	unsigned char buf[CTRL_BUF_SIZE];

	int tx_ctrl_done;

	struct miscdevice ccid_ctrl_device;

};



struct ccid_bulk_dev {
@@ -49,11 +56,16 @@ struct ccid_bulk_dev { 
	struct usb_request *rx_req;

	int rx_done;

	struct list_head tx_idle;

	struct miscdevice ccid_bulk_device;

};



struct ccid_opts {

	struct usb_function_instance func_inst;

	struct f_ccid *ccid;

};



struct f_ccid {

	struct usb_function function;

	struct usb_composite_dev *cdev;

	int ifc_id;

	spinlock_t lock;

	atomic_t online;
@@ -67,9 +79,15 @@ struct f_ccid { 
	int dtr_state;

};



static struct f_ccid *_ccid_dev;

static struct miscdevice ccid_bulk_device;

static struct miscdevice ccid_ctrl_device;

static inline struct f_ccid *ctrl_dev_to_ccid(struct ccid_ctrl_dev *d)

{

	return container_of(d, struct f_ccid, ctrl_dev);

}



static inline struct f_ccid *bulk_dev_to_ccid(struct ccid_bulk_dev *d)

{

	return container_of(d, struct f_ccid, bulk_dev);

}



/* Interface Descriptor: */

static struct usb_interface_descriptor ccid_interface_desc = {
@@ -232,7 +250,7 @@ static void ccid_notify_complete(struct usb_ep *ep, struct usb_request *req) 


static void ccid_bulk_complete_in(struct usb_ep *ep, struct usb_request *req)

{

	struct f_ccid *ccid_dev = _ccid_dev;

	struct f_ccid *ccid_dev = req->context;

	struct ccid_bulk_dev *bulk_dev = &ccid_dev->bulk_dev;



	if (req->status != 0)
@@ -244,9 +262,8 @@ static void ccid_bulk_complete_in(struct usb_ep *ep, struct usb_request *req) 


static void ccid_bulk_complete_out(struct usb_ep *ep, struct usb_request *req)

{

	struct f_ccid *ccid_dev = _ccid_dev;

	struct f_ccid *ccid_dev = req->context;

	struct ccid_bulk_dev *bulk_dev = &ccid_dev->bulk_dev;



	if (req->status != 0)

		atomic_set(&bulk_dev->error, 1);
@@ -378,7 +395,7 @@ ccid_function_set_alt(struct usb_function *f, unsigned int intf, 
		unsigned int alt)

{

	struct f_ccid *ccid_dev = func_to_ccid(f);

	struct usb_composite_dev *cdev = ccid_dev->cdev;

	struct usb_composite_dev *cdev = f->config->cdev;

	struct ccid_bulk_dev *bulk_dev = &ccid_dev->bulk_dev;

	struct usb_request *req;

	int ret = 0;
@@ -570,8 +587,10 @@ static int ccid_function_bind(struct usb_configuration *c, 


static int ccid_bulk_open(struct inode *ip, struct file *fp)

{

	struct f_ccid *ccid_dev = _ccid_dev;

	struct ccid_bulk_dev *bulk_dev = &ccid_dev->bulk_dev;

	struct ccid_bulk_dev *bulk_dev =  container_of(fp->private_data,

						struct ccid_bulk_dev,

						ccid_bulk_device);

	struct f_ccid *ccid_dev = bulk_dev_to_ccid(bulk_dev);

	unsigned long flags;



	pr_debug("ccid_bulk_open\n");
@@ -734,7 +753,7 @@ static ssize_t ccid_bulk_write(struct file *fp, const char __user *buf, 
		goto done;

	}



	if (atomic_read(&bulk_dev->error)) {

	if (!req || atomic_read(&bulk_dev->error)) {

		pr_err(" %s dev->error\n", __func__);

		r = -EIO;

		goto done;
@@ -784,12 +803,6 @@ static const struct file_operations ccid_bulk_fops = { 
	.release = ccid_bulk_release,

};



static struct miscdevice ccid_bulk_device = {

	.minor = MISC_DYNAMIC_MINOR,

	.name = "ccid_bulk",

	.fops = &ccid_bulk_fops,

};



static int ccid_bulk_device_init(struct f_ccid *dev)

{

	int ret;
@@ -799,7 +812,11 @@ static int ccid_bulk_device_init(struct f_ccid *dev) 
	init_waitqueue_head(&bulk_dev->write_wq);

	INIT_LIST_HEAD(&bulk_dev->tx_idle);



	ret = misc_register(&ccid_bulk_device);

	bulk_dev->ccid_bulk_device.name = CCID_BULK_DEV_NAME;

	bulk_dev->ccid_bulk_device.fops = &ccid_bulk_fops;

	bulk_dev->ccid_bulk_device.minor = MISC_DYNAMIC_MINOR;



	ret = misc_register(&bulk_dev->ccid_bulk_device);

	if (ret) {

		pr_err("%s: failed to register misc device\n", __func__);

		return ret;
@@ -810,8 +827,10 @@ static int ccid_bulk_device_init(struct f_ccid *dev) 


static int ccid_ctrl_open(struct inode *inode, struct file *fp)

{

	struct f_ccid *ccid_dev =  _ccid_dev;

	struct ccid_ctrl_dev *ctrl_dev = &ccid_dev->ctrl_dev;

	struct ccid_ctrl_dev *ctrl_dev =  container_of(fp->private_data,

						struct ccid_ctrl_dev,

						ccid_ctrl_device);

	struct f_ccid *ccid_dev = ctrl_dev_to_ccid(ctrl_dev);

	unsigned long flags;



	if (!atomic_read(&ccid_dev->online)) {
@@ -915,12 +934,6 @@ static const struct file_operations ccid_ctrl_fops = { 
	.unlocked_ioctl	= ccid_ctrl_ioctl,

};



static struct miscdevice ccid_ctrl_device = {

	.minor = MISC_DYNAMIC_MINOR,

	.name = "ccid_ctrl",

	.fops = &ccid_ctrl_fops,

};



static int ccid_ctrl_device_init(struct f_ccid *dev)

{

	int ret;
@@ -929,7 +942,11 @@ static int ccid_ctrl_device_init(struct f_ccid *dev) 
	INIT_LIST_HEAD(&ctrl_dev->tx_q);

	init_waitqueue_head(&ctrl_dev->tx_wait_q);



	ret = misc_register(&ccid_ctrl_device);

	ctrl_dev->ccid_ctrl_device.name = CCID_CTRL_DEV_NAME;

	ctrl_dev->ccid_ctrl_device.fops = &ccid_ctrl_fops;

	ctrl_dev->ccid_ctrl_device.minor = MISC_DYNAMIC_MINOR;



	ret = misc_register(&ctrl_dev->ccid_ctrl_device);

	if (ret) {

		pr_err("%s: failed to register misc device\n", __func__);

		return ret;
@@ -938,12 +955,15 @@ static int ccid_ctrl_device_init(struct f_ccid *dev) 
	return 0;

}



static int ccid_bind_config(struct usb_configuration *c)

static void ccid_free_func(struct usb_function *f)

{

	struct f_ccid *ccid_dev = _ccid_dev;

	pr_debug("%s\n", __func__);

}



static int ccid_bind_config(struct f_ccid *ccid_dev)

{

	pr_debug("ccid_bind_config\n");

	ccid_dev->cdev = c->cdev;



	ccid_dev->function.name = FUNCTION_NAME;

	ccid_dev->function.fs_descriptors = ccid_fs_descs;

	ccid_dev->function.hs_descriptors = ccid_hs_descs;
@@ -952,21 +972,22 @@ static int ccid_bind_config(struct usb_configuration *c) 
	ccid_dev->function.set_alt = ccid_function_set_alt;

	ccid_dev->function.setup = ccid_function_setup;

	ccid_dev->function.disable = ccid_function_disable;

	ccid_dev->function.free_func = ccid_free_func;



	return usb_add_function(c, &ccid_dev->function);



	return 0;

}



static int ccid_setup(void)

static struct f_ccid *ccid_setup(void)

{

	struct f_ccid  *ccid_dev;

	int ret;



	ccid_dev = kzalloc(sizeof(*ccid_dev), GFP_KERNEL);

	if (!ccid_dev)

		return -ENOMEM;

	if (!ccid_dev) {

		ret = -ENOMEM;

		goto error;

	}



	_ccid_dev = ccid_dev;

	spin_lock_init(&ccid_dev->lock);



	ret = ccid_ctrl_device_init(ccid_dev);
@@ -982,18 +1003,103 @@ static int ccid_setup(void) 
		goto err_bulk_init;

	}



	return 0;

	return ccid_dev;

err_bulk_init:

	misc_deregister(&ccid_ctrl_device);

	misc_deregister(&ccid_dev->ctrl_dev.ccid_ctrl_device);

err_ctrl_init:

	kfree(ccid_dev);

error:

	pr_err("ccid gadget driver failed to initialize\n");

	return ret;

	return ERR_PTR(ret);

}



static inline struct ccid_opts *to_ccid_opts(struct config_item *item)

{

	return container_of(to_config_group(item), struct ccid_opts,

			    func_inst.group);

}



static void ccid_cleanup(void)

static void ccid_attr_release(struct config_item *item)

{

	misc_deregister(&ccid_bulk_device);

	misc_deregister(&ccid_ctrl_device);

	kfree(_ccid_dev);

	struct ccid_opts *opts = to_ccid_opts(item);



	usb_put_function_instance(&opts->func_inst);

}



static struct configfs_item_operations ccid_item_ops = {

	.release        = ccid_attr_release,

};



static struct config_item_type ccid_func_type = {

	.ct_item_ops    = &ccid_item_ops,

	.ct_owner       = THIS_MODULE,

};



static int ccid_set_inst_name(struct usb_function_instance *fi,

	const char *name)

{

	int name_len;

	struct f_ccid *ccid;

	struct ccid_opts *opts = container_of(fi, struct ccid_opts, func_inst);



	name_len = strlen(name) + 1;

	if (name_len > MAX_INST_NAME_LEN)

		return -ENAMETOOLONG;



	ccid = ccid_setup();

	if (IS_ERR(ccid))

		return PTR_ERR(ccid);



	opts->ccid = ccid;



	return 0;

}



static void ccid_free_inst(struct usb_function_instance *f)

{

	struct ccid_opts *opts = container_of(f, struct ccid_opts, func_inst);



	if (!opts->ccid)

		return;



	misc_deregister(&opts->ccid->ctrl_dev.ccid_ctrl_device);

	misc_deregister(&opts->ccid->bulk_dev.ccid_bulk_device);



	kfree(opts->ccid);

	kfree(opts);

}





static struct usb_function_instance *ccid_alloc_inst(void)

{

	struct ccid_opts *opts;



	opts = kzalloc(sizeof(*opts), GFP_KERNEL);

	if (!opts)

		return ERR_PTR(-ENOMEM);



	opts->func_inst.set_inst_name = ccid_set_inst_name;

	opts->func_inst.free_func_inst = ccid_free_inst;

	config_group_init_type_name(&opts->func_inst.group, "",

				    &ccid_func_type);



	return &opts->func_inst;

}



static struct usb_function *ccid_alloc(struct usb_function_instance *fi)

{

	struct ccid_opts *opts;

	int ret;



	opts = container_of(fi, struct ccid_opts, func_inst);



	ret = ccid_bind_config(opts->ccid);

	if (ret)

		return ERR_PTR(ret);



	return &opts->ccid->function;

}



DECLARE_USB_FUNCTION_INIT(ccid, ccid_alloc_inst, ccid_alloc);

MODULE_DESCRIPTION("USB CCID function Driver");

MODULE_LICENSE("GPL v2");