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USB: cdc-acm: clean up no-union-descriptor handling 

For interfaces that lack a union descriptor, probe for a
"combined-interface" before falling back to the call-management
descriptor instead of the other way round.

This allows for the removal of the NO_DATA_INTERFACE quirk and makes the
probe algorithm somewhat easier to follow.

Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20200921135951.24045-5-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2020-09-21 15:59:51 +02:00 committed by Greg Kroah-Hartman
parent 319bb4a7fe
commit bf1c674498
2 changed files with 15 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/usb/class/cdc-acm.c
View File

@ -1219,26 +1219,19 @@ static int acm_probe(struct usb_interface *intf,
call_intf_num = cmgmd->bDataInterface;
if (!union_header) {
if (call_intf_num > 0) {
if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
combined_interfaces = 1;
control_interface = data_interface = intf;
goto look_for_collapsed_interface;
} else if (call_intf_num > 0) {
dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
/* quirks for Droids MuIn LCD */
if (quirks & NO_DATA_INTERFACE) {
data_interface = usb_ifnum_to_if(usb_dev, 0);
} else {
data_intf_num = call_intf_num;
data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
}
data_intf_num = call_intf_num;
data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
control_interface = intf;
} else {
if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
dev_dbg(&intf->dev,"No union descriptor, giving up\n");
return -ENODEV;
} else {
dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
combined_interfaces = 1;
control_interface = data_interface = intf;
goto look_for_collapsed_interface;
}
dev_dbg(&intf->dev, "No union descriptor, giving up\n");
return -ENODEV;
}
} else {
int class = -1;
@ -1882,11 +1875,6 @@ static const struct usb_device_id acm_ids[] = {
/* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
/* Support for Droids MuIn LCD */
{ USB_DEVICE(0x04d8, 0x000b),
.driver_info = NO_DATA_INTERFACE,
},
#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
{ USB_DEVICE(0x04d8, 0x0082), /* Application mode */
.driver_info = IGNORE_DEVICE,

11
drivers/usb/class/cdc-acm.h
View File

@ -135,9 +135,8 @@ struct acm {
#define NO_UNION_NORMAL BIT(0)
#define SINGLE_RX_URB BIT(1)
#define NO_CAP_LINE BIT(2)
#define NO_DATA_INTERFACE BIT(4)
#define IGNORE_DEVICE BIT(5)
#define QUIRK_CONTROL_LINE_STATE BIT(6)
#define CLEAR_HALT_CONDITIONS BIT(7)
#define SEND_ZERO_PACKET BIT(8)
#define DISABLE_ECHO BIT(9)
#define IGNORE_DEVICE BIT(3)
#define QUIRK_CONTROL_LINE_STATE BIT(4)
#define CLEAR_HALT_CONDITIONS BIT(5)
#define SEND_ZERO_PACKET BIT(6)
#define DISABLE_ECHO BIT(7)