UM0851 datasheet(73/245 Pages) STMICROELECTRONICS

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UM0851

Communication device drivers

Doc ID 16604 Rev 2

73/245

Registering to composite device

/* usb composite gadget need to fill following structure */

static struct usb_composite_driver zero_driver = {

.name = "zero";

.dev = &device_desc;

.strings = dev_strings;

.bind = zero_bind; /* callback called on successful registration */

};

/* Following are the APIs for register/un-register */

usb_composite_register(&zero_driver);

usb_composite_unregister(&zero_driver);

Adding configuration

Any composite device can have multiple configurations with multiple interfaces, each

interface (or a group of interface) representing a unique function. You can use the following

API to add a configuration.

static struct usb_configuration sourcesink_driver = {

.label = "source/sink",

.strings = sourcesink_strings,

.bind= sourcesink_bind_config, /* callback called during registration to finish

other configurations */

.setup = sourcesink_setup, /* callback to handle control requests */

.bConfigurationValue = 3,

.bmAttributes = USB_CONFIG_ATT_SELFPOWER,

.bMaxPower = 1,/* 2 mA, minimal */

};

/* following function registered earlier, is called during registration */

static int __init zero_bind(struct usb_composite_dev *cdev)

{

...

usb_add_config(cdev, &sourcesink_driver);

...

}

Adding function

After adding configurations, you also need to define functions supported in each

configuration. We can add several functions as per our composite device design.

You can use the following mechanism to add functions to configurations.

/* Following function registered earlier is called during registration */

static int sourcesink_bind_config(struct usb_configuration *c)

{

struct f_sourcesink*ss;

int

status;

ss = kzalloc(sizeof *ss, GFP_KERNEL);

if (!ss)

return -ENOMEM;

ss->function.name = "source/sink";

ss->function.descriptors = fs_source_sink_descs;

ss->function.bind = sourcesink_bind;

ss->function.unbind = sourcesink_unbind;

ss->function.set_alt = sourcesink_set_alt;

UM0851 Datasheet(PDF) 73 Page - STMicroelectronics

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