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Commit c4cabd28 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
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USB: cdc-acm: export parsed capabilities through sysfs 



this patch exports the attributes cdc-acm knows about a device through sysfs.

Signed-off-by: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent bb74782e

drivers/usb/class/cdc-acm.c

+76 −5
Original line number Diff line number Diff line
@@ -212,7 +212,41 @@ static int acm_write_start(struct acm *acm) 
	}

	return rc;

}

/*

 * attributes exported through sysfs

 */

static ssize_t show_caps

(struct device *dev, struct device_attribute *attr, char *buf)

{

	struct usb_interface *intf = to_usb_interface(dev);

	struct acm *acm = usb_get_intfdata(intf);



	return sprintf(buf, "%d", acm->ctrl_caps);

}

static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);



static ssize_t show_country_codes

(struct device *dev, struct device_attribute *attr, char *buf)

{

	struct usb_interface *intf = to_usb_interface(dev);

	struct acm *acm = usb_get_intfdata(intf);



	memcpy(buf, acm->country_codes, acm->country_code_size);

	return acm->country_code_size;

}



static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);



static ssize_t show_country_rel_date

(struct device *dev, struct device_attribute *attr, char *buf)

{

	struct usb_interface *intf = to_usb_interface(dev);

	struct acm *acm = usb_get_intfdata(intf);



	return sprintf(buf, "%d", acm->country_rel_date);

}



static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);

/*

 * Interrupt handlers for various ACM device responses

 */
@@ -514,6 +548,7 @@ static void acm_tty_unregister(struct acm *acm) 
	usb_free_urb(acm->writeurb);

	for (i = 0; i < nr; i++)

		usb_free_urb(acm->ru[i].urb);

	kfree(acm->country_codes);

	kfree(acm);

}
@@ -761,6 +796,7 @@ static int acm_probe (struct usb_interface *intf, 
		      const struct usb_device_id *id)

{

	struct usb_cdc_union_desc *union_header = NULL;

	struct usb_cdc_country_functional_desc *cfd = NULL;

	char *buffer = intf->altsetting->extra;

	int buflen = intf->altsetting->extralen;

	struct usb_interface *control_interface;
@@ -824,8 +860,9 @@ static int acm_probe (struct usb_interface *intf, 
				union_header = (struct usb_cdc_union_desc *)

							buffer;

				break;

			case USB_CDC_COUNTRY_TYPE: /* maybe somehow export */

				break; /* for now we ignore it */

			case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/

				cfd = (struct usb_cdc_country_functional_desc *)buffer;

				break;

			case USB_CDC_HEADER_TYPE: /* maybe check version */ 

				break; /* for now we ignore it */ 

			case USB_CDC_ACM_TYPE:
@@ -983,6 +1020,34 @@ static int acm_probe (struct usb_interface *intf, 
		goto alloc_fail7;

	}



	usb_set_intfdata (intf, acm);



	i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);

	if (i < 0)

		goto alloc_fail8;



	if (cfd) { /* export the country data */

		acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);

		if (!acm->country_codes)

			goto skip_countries;

		acm->country_code_size = cfd->bLength - 4;

		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0, cfd->bLength - 4);

		acm->country_rel_date = cfd->iCountryCodeRelDate;



		i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);

		if (i < 0) {

			kfree(acm->country_codes);

			goto skip_countries;

		}



		i = device_create_file(&intf->dev, &dev_attr_iCountryCodeRelDate);

		if (i < 0) {

			kfree(acm->country_codes);

			goto skip_countries;

		}

	}



skip_countries:

	usb_fill_int_urb(acm->ctrlurb, usb_dev, usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),

			 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm, epctrl->bInterval);

	acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
@@ -1006,9 +1071,10 @@ static int acm_probe (struct usb_interface *intf, 
	tty_register_device(acm_tty_driver, minor, &control_interface->dev);



	acm_table[minor] = acm;

	usb_set_intfdata (intf, acm);

	return 0;



	return 0;

alloc_fail8:

	usb_free_urb(acm->writeurb);

alloc_fail7:

	for (i = 0; i < num_rx_buf; i++)

		usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);
@@ -1041,6 +1107,11 @@ static void acm_disconnect(struct usb_interface *intf) 
		mutex_unlock(&open_mutex);

		return;

	}

	if (acm->country_codes){

		device_remove_file(&intf->dev, &dev_attr_wCountryCodes);

		device_remove_file(&intf->dev, &dev_attr_iCountryCodeRelDate);

	}

	device_remove_file(&intf->dev, &dev_attr_bmCapabilities);

	acm->dev = NULL;

	usb_set_intfdata(acm->control, NULL);

	usb_set_intfdata(acm->data, NULL);

drivers/usb/class/cdc-acm.h

+3 −0
Original line number Diff line number Diff line
@@ -91,6 +91,9 @@ struct acm { 
	struct urb *ctrlurb, *writeurb;			/* urbs */

	u8 *ctrl_buffer;				/* buffers of urbs */

	dma_addr_t ctrl_dma;				/* dma handles of buffers */

	u8 *country_codes;				/* country codes from device */

	unsigned int country_code_size;			/* size of this buffer */

	unsigned int country_rel_date;			/* release date of version */

	struct acm_wb wb[ACM_NW];

	struct acm_ru ru[ACM_NR];

	struct acm_rb rb[ACM_NR];