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/*
* 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;
}
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