From cc175ce2c01fc78dbf98a2b00f23d8863de20764 Mon Sep 17 00:00:00 2001 From: Gernot Hillier Date: Mon, 11 Jan 2010 09:30:00 +0100 Subject: [PATCH] USB: serial: option.c: Add blacklisting infrastructure for special device handling As suggested by Matthias Urlichs, this patch adds a somehow generic mechanism for special handling of devices which don't support all bits expected by this driver. The blacklisting code is heavily stolen from sierra.c, but extended to support different special cases. For now, one case is implemented (OPTION_BLACKLIST_SENDSETUP), targeted at the 4G W14 device: devices which don't understand the setting of RTS/DTR in option_send_setup() causing a USB timeout of 5 s in any userspace open() which leads to errors in most userspace applications. In addition, I prepared another case for devices with interfaces which shall not be accessed by this driver (targeted at the D-Link DWM 652). However, OPTION_BLACKLIST_RESERVED_IF is not fully implemented yet as I have no device to test this. Anyone volunteering to help here? If not, I'll contact the guys who added D-Link DWM 652 support soon. Signed-off-by: Gernot Hillier Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/option.c | 40 +++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c index b4fe9ffd6dd6..85e5fc08bba6 100644 --- a/drivers/usb/serial/option.c +++ b/drivers/usb/serial/option.c @@ -346,6 +346,19 @@ static int option_resume(struct usb_serial *serial); #define HAIER_VENDOR_ID 0x201e #define HAIER_PRODUCT_CE100 0x2009 +/* some devices interfaces need special handling due to a number of reasons */ +enum option_blacklist_reason { + OPTION_BLACKLIST_NONE = 0, + OPTION_BLACKLIST_SENDSETUP = 1, + OPTION_BLACKLIST_RESERVED_IF = 2 +}; + +struct option_blacklist_info { + const u32 infolen; /* number of interface numbers on blacklist */ + const u8 *ifaceinfo; /* pointer to the array holding the numbers */ + enum option_blacklist_reason reason; +}; + static const struct usb_device_id option_ids[] = { { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) }, { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA) }, @@ -711,6 +724,7 @@ struct option_intf_private { spinlock_t susp_lock; unsigned int suspended:1; int in_flight; + struct option_blacklist_info *blacklist_info; }; struct option_port_private { @@ -780,9 +794,27 @@ static int option_probe(struct usb_serial *serial, if (!data) return -ENOMEM; spin_lock_init(&data->susp_lock); + data->blacklist_info = (struct option_blacklist_info*) id->driver_info; return 0; } +static enum option_blacklist_reason is_blacklisted(const u8 ifnum, + const struct option_blacklist_info *blacklist) +{ + const u8 *info; + int i; + + if (blacklist) { + info = blacklist->ifaceinfo; + + for (i = 0; i < blacklist->infolen; i++) { + if (info[i] == ifnum) + return blacklist->reason; + } + } + return OPTION_BLACKLIST_NONE; +} + static void option_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { @@ -1213,11 +1245,19 @@ static void option_setup_urbs(struct usb_serial *serial) static int option_send_setup(struct usb_serial_port *port) { struct usb_serial *serial = port->serial; + struct option_intf_private *intfdata = + (struct option_intf_private *) serial->private; struct option_port_private *portdata; int ifNum = serial->interface->cur_altsetting->desc.bInterfaceNumber; int val = 0; dbg("%s", __func__); + if (is_blacklisted(ifNum, intfdata->blacklist_info) == + OPTION_BLACKLIST_SENDSETUP) { + dbg("No send_setup on blacklisted interface #%d\n", ifNum); + return -EIO; + } + portdata = usb_get_serial_port_data(port); if (portdata->dtr_state) -- 2.30.2