diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/storage/option_ms.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/drivers/usb/storage/option_ms.c b/drivers/usb/storage/option_ms.c new file mode 100644 index 000000000..7c0b05a36 --- /dev/null +++ b/drivers/usb/storage/option_ms.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * 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> + */ + +#include <linux/usb.h> +#include <linux/slab.h> +#include <linux/module.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) +{ + static 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; + + usb_stor_dbg(us, "Option MS: %s\n", "DEVICE MODE SWITCH"); + + 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, + us->send_bulk_pipe, + 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. + */ + usb_stor_bulk_transfer_buf(us, + us->recv_bulk_pipe, + buffer, RESPONSE_LEN, NULL); + + /* Read the CSW */ + usb_stor_bulk_transfer_buf(us, + us->recv_bulk_pipe, + buffer, 13, NULL); + + result = USB_STOR_XFER_GOOD; + +out: + kfree(buffer); + return result; +} + +static int option_inquiry(struct us_data *us) +{ + static const unsigned char inquiry_msg[] = { + 0x55, 0x53, 0x42, 0x43, 0x12, 0x34, 0x56, 0x78, + 0x24, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x12, + 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 + }; + char *buffer; + int result; + + usb_stor_dbg(us, "Option MS: %s\n", "device inquiry for vendor name"); + + buffer = kzalloc(0x24, GFP_KERNEL); + if (buffer == NULL) + return USB_STOR_TRANSPORT_ERROR; + + memcpy(buffer, inquiry_msg, sizeof(inquiry_msg)); + result = usb_stor_bulk_transfer_buf(us, + us->send_bulk_pipe, + buffer, sizeof(inquiry_msg), NULL); + if (result != USB_STOR_XFER_GOOD) { + result = USB_STOR_XFER_ERROR; + goto out; + } + + result = usb_stor_bulk_transfer_buf(us, + us->recv_bulk_pipe, + buffer, 0x24, NULL); + if (result != USB_STOR_XFER_GOOD) { + result = USB_STOR_XFER_ERROR; + goto out; + } + + result = memcmp(buffer+8, "Option", 6); + + if (result != 0) + result = memcmp(buffer+8, "ZCOPTION", 8); + + /* Read the CSW */ + usb_stor_bulk_transfer_buf(us, + us->recv_bulk_pipe, + buffer, 13, NULL); + +out: + kfree(buffer); + return result; +} + + +int option_ms_init(struct us_data *us) +{ + int result; + + usb_stor_dbg(us, "Option MS: %s\n", "option_ms_init called"); + + /* + * Additional test for vendor information via INQUIRY, + * because some vendor/product IDs are ambiguous + */ + result = option_inquiry(us); + if (result != 0) { + usb_stor_dbg(us, "Option MS: %s\n", + "vendor is not Option or not determinable, no action taken"); + return 0; + } else + usb_stor_dbg(us, "Option MS: %s\n", + "this is a genuine Option device, proceeding"); + + /* Force Modem mode */ + if (option_zero_cd == ZCD_FORCE_MODEM) { + usb_stor_dbg(us, "Option MS: %s\n", "Forcing Modem Mode"); + result = option_rezero(us); + if (result != USB_STOR_XFER_GOOD) + usb_stor_dbg(us, "Option MS: %s\n", + "Failed to switch to modem mode"); + return -EIO; + } else if (option_zero_cd == ZCD_ALLOW_MS) { + /* Allow Mass Storage mode (keep CD-Rom) */ + usb_stor_dbg(us, "Option MS: %s\n", + "Allowing Mass Storage Mode if device requests it"); + } + + return 0; +} + |