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USB: composite: Add class driver for enabling and disabling USB functions.

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Signed-off-by: Mike Lockwood <lockwood@android.com>
This commit is contained in:
Mike Lockwood
2010-02-06 21:53:51 -05:00
committed by Arve Hjønnevåg
parent 1d69bc989d
commit f8cf7f90ac
2 changed files with 54 additions and 2 deletions
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50
drivers/usb/gadget/composite.c
View File

@@ -71,6 +71,33 @@ MODULE_PARM_DESC(iSerialNumber, "SerialNumber string");
/*-------------------------------------------------------------------------*/
static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct usb_function *f = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", !f->hidden);
}
static ssize_t enable_store(
struct device *dev, struct device_attribute *attr,
const char *buf, size_t size)
{
struct usb_function *f = dev_get_drvdata(dev);
struct usb_composite_driver *driver = f->config->cdev->driver;
int value;
sscanf(buf, "%d", &value);
if (driver->enable_function)
driver->enable_function(f, value);
else
f->hidden = !value;
return size;
}
static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, enable_show, enable_store);
/**
* usb_add_function() - add a function to a configuration
* @config: the configuration
@@ -88,15 +115,30 @@ MODULE_PARM_DESC(iSerialNumber, "SerialNumber string");
int __init usb_add_function(struct usb_configuration *config,
struct usb_function *function)
{
struct usb_composite_dev *cdev = config->cdev;
int value = -EINVAL;
int index;
DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n",
DBG(cdev, "adding '%s'/%p to config '%s'/%p\n",
function->name, function,
config->label, config);
if (!function->set_alt || !function->disable)
goto done;
index = atomic_inc_return(&cdev->driver->function_count);
function->dev = device_create(cdev->driver->class, NULL,
MKDEV(0, index), NULL, function->name);
if (IS_ERR(function->dev))
return PTR_ERR(function->dev);
value = device_create_file(function->dev, &dev_attr_enable);
if (value < 0) {
device_destroy(cdev->driver->class, MKDEV(0, index));
return value;
}
dev_set_drvdata(function->dev, function);
function->config = config;
list_add_tail(&function->list, &config->functions);
@@ -122,7 +164,7 @@ int __init usb_add_function(struct usb_configuration *config,
done:
if (value)
DBG(config->cdev, "adding '%s'/%p --> %d\n",
DBG(cdev, "adding '%s'/%p --> %d\n",
function->name, function, value);
return value;
}
@@ -1124,6 +1166,10 @@ int __init usb_composite_register(struct usb_composite_driver *driver)
composite_driver.driver.name = driver->name;
composite = driver;
driver->class = class_create(THIS_MODULE, "usb_composite");
if (IS_ERR(driver->class))
return PTR_ERR(driver->class);
return usb_gadget_register_driver(&composite_driver);
}

6
include/linux/usb/composite.h
View File

@@ -128,6 +128,7 @@ struct usb_function {
/* private: */
/* internals */
struct list_head list;
struct device *dev;
};
int usb_add_function(struct usb_configuration *, struct usb_function *);
@@ -268,6 +269,9 @@ struct usb_composite_driver {
const struct usb_device_descriptor *dev;
struct usb_gadget_strings **strings;
struct class *class;
atomic_t function_count;
/* REVISIT: bind() functions can be marked __init, which
* makes trouble for section mismatch analysis. See if
* we can't restructure things to avoid mismatching...
@@ -279,6 +283,8 @@ struct usb_composite_driver {
/* global suspend hooks */
void (*suspend)(struct usb_composite_dev *);
void (*resume)(struct usb_composite_dev *);
void (*enable_function)(struct usb_function *f, int enable);
};
extern int usb_composite_register(struct usb_composite_driver *);