[PATCH v2] usb: gadget: dfu: Rework dfu command to use usbgadget

[Jules Maselbas <jmaselbas@kalray.eu>]

The dfu command now uses the composite multi gadget to register the usb
functionality. This allows the removal of the usb composite driver from
dfu.c

As the dfu command is blocking the command slice must be released while
the dfu gadget is running in order to do operations on the file system.

The usb_dfu_register() function is replaced with usb_dfu_detached() for
the dfu command to return a different value depending on if it has been
interrupted with CTRL-C or if the gadget has been detached.

Tested-by: Anže Lešnik <anze.lesnik@norik.com>
Signed-off-by: Jules Maselbas <jmaselbas@kalray.eu>

---
changes in v2:
 - Rebased on next: update for the new usbgadget_register() prototype
---
 commands/dfu.c           |  29 +++----
 drivers/usb/gadget/dfu.c | 163 +--------------------------------------
 include/usb/dfu.h        |   2 +-
 3 files changed, 18 insertions(+), 176 deletions(-)

diff --git a/commands/dfu.c b/commands/dfu.c
index 3132a7479d..1734947fe0 100644
--- a/commands/dfu.c
+++ b/commands/dfu.c
@@ -11,6 +11,7 @@
 #include <fs.h>
 #include <xfuncs.h>
 #include <usb/dfu.h>
+#include <usb/gadget-multi.h>
 #include <linux/err.h>
 
 /* dfu /dev/self0(bootloader)sr,/dev/nand0.root.bb(root)
@@ -20,28 +21,28 @@
  */
 static int do_dfu(int argc, char *argv[])
 {
-	struct f_dfu_opts opts;
-	char *argstr;
-	struct usb_dfu_dev *dfu_alts = NULL;
+	struct usbgadget_funcs funcs = {};
 	int ret;
 
 	if (argc != optind + 1)
 		return COMMAND_ERROR_USAGE;
 
-	argstr = argv[optind];
+	funcs.flags |= USBGADGET_DFU;
+	funcs.dfu_opts = argv[optind];
+	ret = usbgadget_register(&funcs);
+	if (ret)
+		return ret;
 
-	opts.files = file_list_parse(argstr);
-	if (IS_ERR(opts.files)) {
-		ret = PTR_ERR(opts.files);
-		goto out;
+	command_slice_release();
+	while (!usb_dfu_detached()) {
+		if (ctrlc()) {
+			ret = -EINTR;
+			break;
+		}
 	}
+	command_slice_acquire();
 
-	ret = usb_dfu_register(&opts);
-
-	file_list_free(opts.files);
-out:
-
-	free(dfu_alts);
+	usb_multi_unregister();
 
 	return ret;
 }
diff --git a/drivers/usb/gadget/dfu.c b/drivers/usb/gadget/dfu.c
index fd0ec505dc..ba5fdd5b74 100644
--- a/drivers/usb/gadget/dfu.c
+++ b/drivers/usb/gadget/dfu.c
@@ -817,168 +817,9 @@ static void dfu_disable(struct usb_function *f)
 	dfu_abort(dfu);
 }
 
-#define STRING_MANUFACTURER_IDX		0
-#define STRING_PRODUCT_IDX		1
-#define STRING_DESCRIPTION_IDX		2
-
-static struct usb_string strings_dev[] = {
-	[STRING_MANUFACTURER_IDX].s = NULL,
-	[STRING_PRODUCT_IDX].s = NULL,
-	[STRING_DESCRIPTION_IDX].s = "USB Device Firmware Upgrade",
-	{  } /* end of list */
-};
-
-static struct usb_gadget_strings stringtab_dev = {
-	.language	= 0x0409,	/* en-us */
-	.strings	= strings_dev,
-};
-
-static struct usb_gadget_strings *dev_strings[] = {
-	&stringtab_dev,
-	NULL,
-};
-
-static void dfu_unbind_config(struct usb_configuration *c)
-{
-	free(dfu_string_defs);
-}
-
-static struct usb_configuration dfu_config_driver = {
-	.label			= "USB DFU",
-	.unbind			= dfu_unbind_config,
-	.bConfigurationValue	= 1,
-	.bmAttributes		= USB_CONFIG_ATT_SELFPOWER,
-};
-
-static struct usb_device_descriptor dfu_dev_descriptor = {
-	.bLength		= USB_DT_DEVICE_SIZE,
-	.bDescriptorType	= USB_DT_DEVICE,
-	.bcdUSB			= 0x0100,
-	.bDeviceClass		= 0x00,
-	.bDeviceSubClass	= 0x00,
-	.bDeviceProtocol	= 0x00,
-/*	.idVendor		= dynamic */
-/*	.idProduct		= dynamic */
-	.bcdDevice		= 0x0000,
-	.bNumConfigurations	= 0x01,
-};
-
-static struct usb_function_instance *fi_dfu;
-static struct usb_function *f_dfu;
-
-static int dfu_driver_bind(struct usb_composite_dev *cdev)
+int usb_dfu_detached(void)
 {
-	struct usb_gadget *gadget = cdev->gadget;
-	int status;
-
-	if (gadget->vendor_id && gadget->product_id) {
-		dfu_dev_descriptor.idVendor = cpu_to_le16(gadget->vendor_id);
-		dfu_dev_descriptor.idProduct = cpu_to_le16(gadget->product_id);
-	} else {
-		dfu_dev_descriptor.idVendor = cpu_to_le16(0x1d50); /* Openmoko, Inc */
-		dfu_dev_descriptor.idProduct = cpu_to_le16(0x60a2); /* barebox bootloader USB DFU Mode */
-	}
-
-	strings_dev[STRING_MANUFACTURER_IDX].s = gadget->manufacturer;
-	strings_dev[STRING_PRODUCT_IDX].s = gadget->productname;
-
-	status = usb_string_id(cdev);
-	if (status < 0)
-		goto fail;
-	strings_dev[STRING_MANUFACTURER_IDX].id = status;
-	dfu_dev_descriptor.iManufacturer = status;
-
-	status = usb_string_id(cdev);
-	if (status < 0)
-		goto fail;
-	strings_dev[STRING_PRODUCT_IDX].id = status;
-	dfu_dev_descriptor.iProduct = status;
-
-	/* config description */
-	status = usb_string_id(cdev);
-	if (status < 0)
-		goto fail;
-	strings_dev[STRING_DESCRIPTION_IDX].id = status;
-	dfu_config_driver.iConfiguration = status;
-
-	status = usb_add_config_only(cdev, &dfu_config_driver);
-	if (status < 0)
-		goto fail;
-
-	fi_dfu = usb_get_function_instance("dfu");
-	if (IS_ERR(fi_dfu)) {
-		status = PTR_ERR(fi_dfu);
-		goto fail;
-	}
-
-	f_dfu = usb_get_function(fi_dfu);
-	if (IS_ERR(f_dfu)) {
-		status = PTR_ERR(f_dfu);
-		goto fail;
-	}
-
-	status = usb_add_function(&dfu_config_driver, f_dfu);
-	if (status)
-		goto fail;
-
-	return 0;
-fail:
-	return status;
-}
-
-static int dfu_driver_unbind(struct usb_composite_dev *cdev)
-{
-	usb_put_function(f_dfu);
-	usb_put_function_instance(fi_dfu);
-
-	return 0;
-}
-
-static struct usb_composite_driver dfu_driver = {
-	.name		= "g_dfu",
-	.dev		= &dfu_dev_descriptor,
-	.strings	= dev_strings,
-	.max_speed	= USB_SPEED_HIGH,
-	.bind		= dfu_driver_bind,
-	.unbind		= dfu_driver_unbind,
-};
-
-int usb_dfu_register(struct f_dfu_opts *opts)
-{
-	int ret;
-
-	if (dfu_files)
-		return -EBUSY;
-
-	dfu_files = opts->files;
-
-	ret = usb_composite_probe(&dfu_driver);
-	if (ret)
-		goto out;
-
-	while (1) {
-		ret = usb_gadget_poll();
-		if (ret < 0)
-			goto out1;
-
-		if (dfudetach) {
-			ret = 0;
-			goto out1;
-		}
-
-		if (ctrlc()) {
-			ret = -EINTR;
-			goto out1;
-		}
-	}
-
-out1:
-	dfudetach = 0;
-	usb_composite_unregister(&dfu_driver);
-out:
-	dfu_files = NULL;
-
-	return ret;
+	return dfudetach;
 }
 
 static void dfu_free_func(struct usb_function *f)
diff --git a/include/usb/dfu.h b/include/usb/dfu.h
index 560a0318fe..81425f7c62 100644
--- a/include/usb/dfu.h
+++ b/include/usb/dfu.h
@@ -29,6 +29,6 @@ struct f_dfu_opts {
 	struct file_list *files;
 };
 
-int usb_dfu_register(struct f_dfu_opts *);
+int usb_dfu_detached(void);
 
 #endif /* _USB_DFU_H */
-- 
2.17.1






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