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Subject[PATCH 6/8] USB: gadget: g_multi: code clean up and refactoring
The Multifunction Compasite Gadget have been cleaned up
and refactored so hopefully it looks prettier and works
at least as good as before changes.

Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
drivers/usb/gadget/Kconfig | 1 +
drivers/usb/gadget/multi.c | 262 +++++++++++++++++++++++++-------------------
2 files changed, 148 insertions(+), 115 deletions(-)
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 649c0c5..1a3270d 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -862,6 +862,7 @@ config USB_G_NOKIA
config USB_G_MULTI
tristate "Multifunction Composite Gadget (EXPERIMENTAL)"
depends on BLOCK && NET
+ select USB_G_MULTI_CDC if ! USB_G_MULTI_RNDIS
help
The Multifunction Composite Gadget provides Ethernet (RNDIS
and/or CDC Ethernet), mass storage and ACM serial link
diff --git a/drivers/usb/gadget/multi.c b/drivers/usb/gadget/multi.c
index d3d3140..cd7d1c1 100644
--- a/drivers/usb/gadget/multi.c
+++ b/drivers/usb/gadget/multi.c
@@ -24,6 +24,7 @@

#include <linux/kernel.h>
#include <linux/utsname.h>
+#include <linux/module.h>


#if defined USB_ETH_RNDIS
@@ -35,14 +36,13 @@


#define DRIVER_DESC "Multifunction Composite Gadget"
-#define DRIVER_VERSION "2009/07/21"

-/*-------------------------------------------------------------------------*/
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Michal Nazarewicz");
+MODULE_LICENSE("GPL");

-#define MULTI_VENDOR_NUM 0x0525 /* XXX NetChip */
-#define MULTI_PRODUCT_NUM 0xa4ab /* XXX */

-/*-------------------------------------------------------------------------*/
+/***************************** All the files... *****************************/

/*
* kbuild is not very cooperative with respect to linking separately
@@ -57,6 +57,8 @@
#include "config.c"
#include "epautoconf.c"

+#include "f_mass_storage.c"
+
#include "u_serial.c"
#include "f_acm.c"

@@ -68,13 +70,26 @@
#endif
#include "u_ether.c"

-#undef DBG /* u_ether.c has broken idea about macros */
-#undef VDBG /* so clean up after it */
-#undef ERROR
-#undef INFO
-#include "f_mass_storage.c"

-/*-------------------------------------------------------------------------*/
+
+/***************************** Device Descriptor ****************************/
+
+#define MULTI_VENDOR_NUM 0x0525 /* XXX NetChip */
+#define MULTI_PRODUCT_NUM 0xa4ab /* XXX */
+
+
+enum {
+ __MULTI_NO_CONFIG,
+#ifdef CONFIG_USB_G_MULTI_RNDIS
+ MULTI_RNDIS_CONFIG_NUM,
+#endif
+#ifdef CONFIG_USB_G_MULTI_CDC
+ MULTI_CDC_CONFIG_NUM,
+#endif
+ __MULTI_NUM_CONFIGS_HELPER,
+ MULTI_NUM_CONFIGS = __MULTI_NUM_CONFIGS_HELPER - 1
+};
+

static struct usb_device_descriptor device_desc = {
.bLength = sizeof device_desc,
@@ -82,80 +97,81 @@ static struct usb_device_descriptor device_desc = {

.bcdUSB = cpu_to_le16(0x0200),

- /* .bDeviceClass = USB_CLASS_COMM, */
- /* .bDeviceSubClass = 0, */
- /* .bDeviceProtocol = 0, */
- .bDeviceClass = 0xEF,
+ .bDeviceClass = USB_CLASS_MISC /* 0xEF */,
.bDeviceSubClass = 2,
.bDeviceProtocol = 1,
- /* .bMaxPacketSize0 = f(hardware) */

/* Vendor and product id can be overridden by module parameters. */
.idVendor = cpu_to_le16(MULTI_VENDOR_NUM),
.idProduct = cpu_to_le16(MULTI_PRODUCT_NUM),
- /* .bcdDevice = f(hardware) */
- /* .iManufacturer = DYNAMIC */
- /* .iProduct = DYNAMIC */
- /* NO SERIAL NUMBER */
- .bNumConfigurations = 1,
+ .bNumConfigurations = MULTI_NUM_CONFIGS,
};

-static struct usb_otg_descriptor otg_descriptor = {
- .bLength = sizeof otg_descriptor,
- .bDescriptorType = USB_DT_OTG,
-
- /* REVISIT SRP-only hardware is possible, although
- * it would not be called "OTG" ...
- */
- .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
-};

static const struct usb_descriptor_header *otg_desc[] = {
- (struct usb_descriptor_header *) &otg_descriptor,
+ (struct usb_descriptor_header *) &(struct usb_otg_descriptor){
+ .bLength = sizeof(struct usb_otg_descriptor),
+ .bDescriptorType = USB_DT_OTG,
+
+ /* REVISIT SRP-only hardware is possible, although
+ * it would not be called "OTG" ... */
+ .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
+ },
NULL,
};


-/* string IDs are assigned dynamically */
-
-#define STRING_MANUFACTURER_IDX 0
-#define STRING_PRODUCT_IDX 1
+enum {
+ MULTI_STRING_MANUFACTURER_IDX,
+ MULTI_STRING_PRODUCT_IDX,
+#ifdef CONFIG_USB_G_MULTI_RNDIS
+ MULTI_STRING_RNDIS_CONFIG_IDX,
+#endif
+#ifdef CONFIG_USB_G_MULTI_CDC
+ MULTI_STRING_CDC_CONFIG_IDX,
+#endif
+};

static char manufacturer[50];

static struct usb_string strings_dev[] = {
- [STRING_MANUFACTURER_IDX].s = manufacturer,
- [STRING_PRODUCT_IDX].s = DRIVER_DESC,
+ [MULTI_STRING_MANUFACTURER_IDX].s = manufacturer,
+ [MULTI_STRING_PRODUCT_IDX ].s = DRIVER_DESC,
+#ifdef CONFIG_USB_G_MULTI_RNDIS
+ [MULTI_STRING_RNDIS_CONFIG_IDX].s = "Multifunction with RNDIS",
+#endif
+#ifdef CONFIG_USB_G_MULTI_CDC
+ [MULTI_STRING_CDC_CONFIG_IDX ].s = "Multifunction with CDC ECM",
+#endif
{ } /* 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,
+ &(struct usb_gadget_strings){
+ .language = 0x0409, /* en-us */
+ .strings = strings_dev,
+ },
NULL,
};

-static u8 hostaddr[ETH_ALEN];



/****************************** Configurations ******************************/

-static struct fsg_module_parameters mod_data = {
- .stall = 1
-};
-FSG_MODULE_PARAMETERS(/* no prefix */, mod_data);
+static struct fsg_module_parameters fsg_mod_data = { .stall = 1 };
+FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
+
+static struct fsg_common fsg_common;
+
+static u8 hostaddr[ETH_ALEN];

-static struct fsg_common *fsg_common;

+/********** RNDIS **********/

#ifdef USB_ETH_RNDIS

-static int __init rndis_do_config(struct usb_configuration *c)
+static __ref int rndis_do_config(struct usb_configuration *c)
{
int ret;

@@ -172,26 +188,42 @@ static int __init rndis_do_config(struct usb_configuration *c)
if (ret < 0)
return ret;

- ret = fsg_bind_config(c->cdev, c, fsg_common);
+ ret = fsg_bind_config(c->cdev, c, &fsg_common);
if (ret < 0)
return ret;

return 0;
}

-static struct usb_configuration rndis_config_driver = {
- .label = "Multifunction Composite (RNDIS + MS + ACM)",
- .bind = rndis_do_config,
- .bConfigurationValue = 2,
- /* .iConfiguration = DYNAMIC */
- .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
-};
+static int rndis_config_register(struct usb_composite_dev *cdev)
+{
+ static struct usb_configuration config = {
+ .bind = rndis_do_config,
+ .bConfigurationValue = MULTI_RNDIS_CONFIG_NUM,
+ .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
+ };
+
+ config.label = strings_dev[MULTI_STRING_RNDIS_CONFIG_IDX].s;
+ config.iConfiguration = strings_dev[MULTI_STRING_RNDIS_CONFIG_IDX].id;
+
+ return usb_add_config(cdev, &config);
+}
+
+#else
+
+static int rndis_config_register(struct usb_composite_dev *cdev)
+{
+ return 0;
+}

#endif

+
+/********** CDC ECM **********/
+
#ifdef CONFIG_USB_G_MULTI_CDC

-static int __init cdc_do_config(struct usb_configuration *c)
+static __ref int cdc_do_config(struct usb_configuration *c)
{
int ret;

@@ -208,20 +240,33 @@ static int __init cdc_do_config(struct usb_configuration *c)
if (ret < 0)
return ret;

- ret = fsg_bind_config(c->cdev, c, fsg_common);
+ ret = fsg_bind_config(c->cdev, c, &fsg_common);
if (ret < 0)
return ret;

return 0;
}

-static struct usb_configuration cdc_config_driver = {
- .label = "Multifunction Composite (CDC + MS + ACM)",
- .bind = cdc_do_config,
- .bConfigurationValue = 1,
- /* .iConfiguration = DYNAMIC */
- .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
-};
+static int cdc_config_register(struct usb_composite_dev *cdev)
+{
+ static struct usb_configuration config = {
+ .bind = cdc_do_config,
+ .bConfigurationValue = MULTI_CDC_CONFIG_NUM,
+ .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
+ };
+
+ config.label = strings_dev[MULTI_STRING_CDC_CONFIG_IDX].s;
+ config.iConfiguration = strings_dev[MULTI_STRING_CDC_CONFIG_IDX].id;
+
+ return usb_add_config(cdev, &config);
+}
+
+#else
+
+static int cdc_config_register(struct usb_composite_dev *cdev)
+{
+ return 0;
+}

#endif

@@ -230,7 +275,7 @@ static struct usb_configuration cdc_config_driver = {
/****************************** Gadget Bind ******************************/


-static int __init multi_bind(struct usb_composite_dev *cdev)
+static int __ref multi_bind(struct usb_composite_dev *cdev)
{
struct usb_gadget *gadget = cdev->gadget;
int status, gcnum;
@@ -252,67 +297,57 @@ static int __init multi_bind(struct usb_composite_dev *cdev)
goto fail0;

/* set up mass storage function */
- fsg_common = fsg_common_from_params(0, cdev, &mod_data);
- if (IS_ERR(fsg_common)) {
- status = PTR_ERR(fsg_common);
- goto fail1;
+ {
+ void *retp;
+ retp = fsg_common_from_params(&fsg_common, cdev, &fsg_mod_data);
+ if (IS_ERR(retp)) {
+ status = PTR_ERR(retp);
+ goto fail1;
+ }
}

-
+ /* set bcdDevice */
gcnum = usb_gadget_controller_number(gadget);
- if (gcnum >= 0)
+ if (gcnum >= 0) {
device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
- else {
- /* We assume that can_support_ecm() tells the truth;
- * but if the controller isn't recognized at all then
- * that assumption is a bit more likely to be wrong.
- */
- WARNING(cdev, "controller '%s' not recognized\n",
- gadget->name);
+ } else {
+ WARNING(cdev, "controller '%s' not recognized\n", gadget->name);
device_desc.bcdDevice = cpu_to_le16(0x0300 | 0x0099);
}

+ /* allocate string descriptor numbers */

- /* Allocate string descriptor numbers ... note that string
- * contents can be overridden by the composite_dev glue.
- */
-
- /* device descriptor strings: manufacturer, product */
snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
init_utsname()->sysname, init_utsname()->release,
gadget->name);
- status = usb_string_id(cdev);
- if (status < 0)
- goto fail2;
- strings_dev[STRING_MANUFACTURER_IDX].id = status;
- device_desc.iManufacturer = status;

- status = usb_string_id(cdev);
- if (status < 0)
+ status = usb_string_ids_tab(cdev, strings_dev);
+ if (unlikely(status < 0))
goto fail2;
- strings_dev[STRING_PRODUCT_IDX].id = status;
- device_desc.iProduct = status;

-#ifdef USB_ETH_RNDIS
- /* register our first configuration */
- status = usb_add_config(cdev, &rndis_config_driver);
- if (status < 0)
+ device_desc.iManufacturer =
+ strings_dev[MULTI_STRING_MANUFACTURER_IDX].id;
+ device_desc.iProduct =
+ strings_dev[MULTI_STRING_PRODUCT_IDX].id;
+
+ /* register configurations */
+ status = rndis_config_register(cdev);
+ if (unlikely(status < 0))
goto fail2;
-#endif

-#ifdef CONFIG_USB_G_MULTI_CDC
- /* register our second configuration */
- status = usb_add_config(cdev, &cdc_config_driver);
- if (status < 0)
+ status = cdc_config_register(cdev);
+ if (unlikely(status < 0))
goto fail2;
-#endif

- dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
- fsg_common_put(fsg_common);
+ /* we're done */
+ dev_info(&gadget->dev, DRIVER_DESC "\n");
+ fsg_common_put(&fsg_common);
return 0;

+
+ /* error recovery */
fail2:
- fsg_common_put(fsg_common);
+ fsg_common_put(&fsg_common);
fail1:
gserial_cleanup();
fail0:
@@ -339,18 +374,15 @@ static struct usb_composite_driver multi_driver = {
.unbind = __exit_p(multi_unbind),
};

-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_AUTHOR("Michal Nazarewicz");
-MODULE_LICENSE("GPL");

-static int __init g_multi_init(void)
+static int __init multi_init(void)
{
return usb_composite_register(&multi_driver);
}
-module_init(g_multi_init);
+module_init(multi_init);

-static void __exit g_multi_cleanup(void)
+static void __exit multi_exit(void)
{
usb_composite_unregister(&multi_driver);
}
-module_exit(g_multi_cleanup);
+module_exit(multi_exit);
--
1.7.1


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