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Commit 19088ddf authored by Badhri Jagan Sridharan's avatar Badhri Jagan Sridharan Committed by Badhri Jagan Sridharan
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ANDROID: usb: gadget: create F_midi device 



Android frameworks relies on the alsa
config reported by the f_midi device.

Signed-off-by: default avatarBadhri Jagan Sridharan <Badhri@google.com>
Change-Id: I0695e00b166fd953f50acea93802245b0d5a5240
parent 0d87d144

drivers/usb/gadget/function/f_midi.c

+65 −0
Original line number Diff line number Diff line
@@ -1048,6 +1048,65 @@ static void f_midi_free_inst(struct usb_function_instance *f) 
	kfree(opts);

}



#ifdef CONFIG_USB_CONFIGFS_UEVENT

extern struct device *create_function_device(char *name);

static ssize_t alsa_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct usb_function_instance *fi_midi = dev_get_drvdata(dev);

	struct f_midi *midi;



	if (!fi_midi->f)

		dev_warn(dev, "f_midi: function not set\n");



	if (fi_midi && fi_midi->f) {

		midi = func_to_midi(fi_midi->f);

		if (midi->rmidi && midi->rmidi->card)

			return sprintf(buf, "%d %d\n",

			midi->rmidi->card->number, midi->rmidi->device);

	}



	/* print PCM card and device numbers */

	return sprintf(buf, "%d %d\n", -1, -1);

}



static DEVICE_ATTR(alsa, S_IRUGO, alsa_show, NULL);



static struct device_attribute *alsa_function_attributes[] = {

	&dev_attr_alsa,

	NULL

};



static int create_alsa_device(struct usb_function_instance *fi)

{

	struct device *dev;

	struct device_attribute **attrs;

	struct device_attribute *attr;

	int err = 0;



	dev = create_function_device("f_midi");

	if (IS_ERR(dev))

		return PTR_ERR(dev);



	attrs = alsa_function_attributes;

	if (attrs) {

		while ((attr = *attrs++) && !err)

			err = device_create_file(dev, attr);

		if (err) {

			device_destroy(dev->class, dev->devt);

			return -EINVAL;

		}

	}

	dev_set_drvdata(dev, fi);

	return 0;

}

#else

static int create_alsa_device(struct usb_function_instance *fi)

{

	return 0;

}

#endif



static struct usb_function_instance *f_midi_alloc_inst(void)

{

	struct f_midi_opts *opts;
@@ -1065,6 +1124,11 @@ static struct usb_function_instance *f_midi_alloc_inst(void) 
	opts->in_ports = 1;

	opts->out_ports = 1;



	if (create_alsa_device(&opts->func_inst)) {

		kfree(opts);

		return ERR_PTR(-ENODEV);

	}



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

				    &midi_func_type);
@@ -1166,6 +1230,7 @@ static struct usb_function *f_midi_alloc(struct usb_function_instance *fi) 
	midi->func.disable	= f_midi_disable;

	midi->func.free_func	= f_midi_free;



	fi->f = &midi->func;

	return &midi->func;



setup_fail: