diff options
Diffstat (limited to 'drivers/usb/storage/option_ms.c')
| -rw-r--r-- | drivers/usb/storage/option_ms.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/drivers/usb/storage/option_ms.c b/drivers/usb/storage/option_ms.c new file mode 100644 index 000000000000..353f922939a4 --- /dev/null +++ b/drivers/usb/storage/option_ms.c @@ -0,0 +1,147 @@ +/* + * Driver for Option High Speed Mobile Devices. + * + * (c) 2008 Dan Williams <dcbw@redhat.com> + * + * Inspiration taken from sierra_ms.c by Kevin Lloyd <klloyd@sierrawireless.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/usb.h> + +#include "usb.h" +#include "transport.h" +#include "option_ms.h" +#include "debug.h" + +#define ZCD_FORCE_MODEM 0x01 +#define ZCD_ALLOW_MS 0x02 + +static unsigned int option_zero_cd = ZCD_FORCE_MODEM; +module_param(option_zero_cd, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(option_zero_cd, "ZeroCD mode (1=Force Modem (default)," + " 2=Allow CD-Rom"); + +#define RESPONSE_LEN 1024 + +static int option_rezero(struct us_data *us, int ep_in, int ep_out) +{ + const unsigned char rezero_msg[] = { + 0x55, 0x53, 0x42, 0x43, 0x78, 0x56, 0x34, 0x12, + 0x01, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x01, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 + }; + char *buffer; + int result; + + US_DEBUGP("Option MS: %s", "DEVICE MODE SWITCH\n"); + + buffer = kzalloc(RESPONSE_LEN, GFP_KERNEL); + if (buffer == NULL) + return USB_STOR_TRANSPORT_ERROR; + + memcpy(buffer, rezero_msg, sizeof (rezero_msg)); + result = usb_stor_bulk_transfer_buf(us, + usb_sndbulkpipe(us->pusb_dev, ep_out), + buffer, sizeof (rezero_msg), NULL); + if (result != USB_STOR_XFER_GOOD) { + result = USB_STOR_XFER_ERROR; + goto out; + } + + /* Some of the devices need to be asked for a response, but we don't + * care what that response is. + */ + result = usb_stor_bulk_transfer_buf(us, + usb_sndbulkpipe(us->pusb_dev, ep_out), + buffer, RESPONSE_LEN, NULL); + result = USB_STOR_XFER_GOOD; + +out: + kfree(buffer); + return result; +} + +int option_ms_init(struct us_data *us) +{ + struct usb_device *udev; + struct usb_interface *intf; + struct usb_host_interface *iface_desc; + struct usb_endpoint_descriptor *endpoint = NULL; + u8 ep_in = 0, ep_out = 0; + int ep_in_size = 0, ep_out_size = 0; + int i, result; + + udev = us->pusb_dev; + intf = us->pusb_intf; + + /* Ensure it's really a ZeroCD device; devices that are already + * in modem mode return 0xFF for class, subclass, and protocol. + */ + if (udev->descriptor.bDeviceClass != 0 || + udev->descriptor.bDeviceSubClass != 0 || + udev->descriptor.bDeviceProtocol != 0) + return USB_STOR_TRANSPORT_GOOD; + + US_DEBUGP("Option MS: option_ms_init called\n"); + + /* Find the right mass storage interface */ + iface_desc = intf->cur_altsetting; + if (iface_desc->desc.bInterfaceClass != 0x8 || + iface_desc->desc.bInterfaceSubClass != 0x6 || + iface_desc->desc.bInterfaceProtocol != 0x50) { + US_DEBUGP("Option MS: mass storage interface not found, no action " + "required\n"); + return USB_STOR_TRANSPORT_GOOD; + } + + /* Find the mass storage bulk endpoints */ + for (i = 0; i < iface_desc->desc.bNumEndpoints && (!ep_in_size || !ep_out_size); ++i) { + endpoint = &iface_desc->endpoint[i].desc; + + if (usb_endpoint_is_bulk_in(endpoint)) { + ep_in = usb_endpoint_num(endpoint); + ep_in_size = le16_to_cpu(endpoint->wMaxPacketSize); + } else if (usb_endpoint_is_bulk_out(endpoint)) { + ep_out = usb_endpoint_num(endpoint); + ep_out_size = le16_to_cpu(endpoint->wMaxPacketSize); + } + } + + /* Can't find the mass storage endpoints */ + if (!ep_in_size || !ep_out_size) { + US_DEBUGP("Option MS: mass storage endpoints not found, no action " + "required\n"); + return USB_STOR_TRANSPORT_GOOD; + } + + /* Force Modem mode */ + if (option_zero_cd == ZCD_FORCE_MODEM) { + US_DEBUGP("Option MS: %s", "Forcing Modem Mode\n"); + result = option_rezero(us, ep_in, ep_out); + if (result != USB_STOR_XFER_GOOD) + US_DEBUGP("Option MS: Failed to switch to modem mode.\n"); + return -EIO; + } else if (option_zero_cd == ZCD_ALLOW_MS) { + /* Allow Mass Storage mode (keep CD-Rom) */ + US_DEBUGP("Option MS: %s", "Allowing Mass Storage Mode if device" + " requests it\n"); + } + + return USB_STOR_TRANSPORT_GOOD; +} + |