LCOV - code coverage report
Current view: top level - drivers/usb/storage - option_ms.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 30 0.0 %
Date: 2014-02-18 Functions: 0 3 0.0 %
Branches: 0 16 0.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Driver for Option High Speed Mobile Devices.
       3                 :            :  *
       4                 :            :  *   (c) 2008 Dan Williams <dcbw@redhat.com>
       5                 :            :  *
       6                 :            :  * Inspiration taken from sierra_ms.c by Kevin Lloyd <klloyd@sierrawireless.com>
       7                 :            :  *
       8                 :            :  * This program is free software; you can redistribute it and/or modify
       9                 :            :  * it under the terms of the GNU General Public License as published by
      10                 :            :  * the Free Software Foundation; either version 2 of the License, or
      11                 :            :  * (at your option) any later version.
      12                 :            :  *
      13                 :            :  * This program is distributed in the hope that it will be useful, but
      14                 :            :  * WITHOUT ANY WARRANTY; without even the implied warranty of
      15                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16                 :            :  * General Public License for more details.
      17                 :            :  *
      18                 :            :  * You should have received a copy of the GNU General Public License along
      19                 :            :  * with this program; if not, write to the Free Software Foundation, Inc.,
      20                 :            :  * 675 Mass Ave, Cambridge, MA 02139, USA.
      21                 :            :  */
      22                 :            : 
      23                 :            : #include <linux/usb.h>
      24                 :            : #include <linux/slab.h>
      25                 :            : #include <linux/module.h>
      26                 :            : 
      27                 :            : #include "usb.h"
      28                 :            : #include "transport.h"
      29                 :            : #include "option_ms.h"
      30                 :            : #include "debug.h"
      31                 :            : 
      32                 :            : #define ZCD_FORCE_MODEM                 0x01
      33                 :            : #define ZCD_ALLOW_MS                    0x02
      34                 :            : 
      35                 :            : static unsigned int option_zero_cd = ZCD_FORCE_MODEM;
      36                 :            : module_param(option_zero_cd, uint, S_IRUGO | S_IWUSR);
      37                 :            : MODULE_PARM_DESC(option_zero_cd, "ZeroCD mode (1=Force Modem (default),"
      38                 :            :                  " 2=Allow CD-Rom");
      39                 :            : 
      40                 :            : #define RESPONSE_LEN 1024
      41                 :            : 
      42                 :          0 : static int option_rezero(struct us_data *us)
      43                 :            : {
      44                 :          0 :         const unsigned char rezero_msg[] = {
      45                 :            :           0x55, 0x53, 0x42, 0x43, 0x78, 0x56, 0x34, 0x12,
      46                 :            :           0x01, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x01,
      47                 :            :           0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      48                 :            :           0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
      49                 :            :         };
      50                 :            :         char *buffer;
      51                 :            :         int result;
      52                 :            : 
      53                 :            :         usb_stor_dbg(us, "Option MS: %s\n", "DEVICE MODE SWITCH");
      54                 :            : 
      55                 :            :         buffer = kzalloc(RESPONSE_LEN, GFP_KERNEL);
      56         [ #  # ]:          0 :         if (buffer == NULL)
      57                 :            :                 return USB_STOR_TRANSPORT_ERROR;
      58                 :            : 
      59                 :          0 :         memcpy(buffer, rezero_msg, sizeof(rezero_msg));
      60                 :          0 :         result = usb_stor_bulk_transfer_buf(us,
      61                 :            :                         us->send_bulk_pipe,
      62                 :            :                         buffer, sizeof(rezero_msg), NULL);
      63         [ #  # ]:          0 :         if (result != USB_STOR_XFER_GOOD) {
      64                 :            :                 result = USB_STOR_XFER_ERROR;
      65                 :            :                 goto out;
      66                 :            :         }
      67                 :            : 
      68                 :            :         /* Some of the devices need to be asked for a response, but we don't
      69                 :            :          * care what that response is.
      70                 :            :          */
      71                 :          0 :         usb_stor_bulk_transfer_buf(us,
      72                 :            :                         us->recv_bulk_pipe,
      73                 :            :                         buffer, RESPONSE_LEN, NULL);
      74                 :            : 
      75                 :            :         /* Read the CSW */
      76                 :          0 :         usb_stor_bulk_transfer_buf(us,
      77                 :            :                         us->recv_bulk_pipe,
      78                 :            :                         buffer, 13, NULL);
      79                 :            : 
      80                 :            :         result = USB_STOR_XFER_GOOD;
      81                 :            : 
      82                 :            : out:
      83                 :          0 :         kfree(buffer);
      84                 :          0 :         return result;
      85                 :            : }
      86                 :            : 
      87                 :          0 : static int option_inquiry(struct us_data *us)
      88                 :            : {
      89                 :          0 :         const unsigned char inquiry_msg[] = {
      90                 :            :           0x55, 0x53, 0x42, 0x43, 0x12, 0x34, 0x56, 0x78,
      91                 :            :           0x24, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x12,
      92                 :            :           0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x00,
      93                 :            :           0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
      94                 :            :         };
      95                 :            :         char *buffer;
      96                 :            :         int result;
      97                 :            : 
      98                 :            :         usb_stor_dbg(us, "Option MS: %s\n", "device inquiry for vendor name");
      99                 :            : 
     100                 :            :         buffer = kzalloc(0x24, GFP_KERNEL);
     101         [ #  # ]:          0 :         if (buffer == NULL)
     102                 :            :                 return USB_STOR_TRANSPORT_ERROR;
     103                 :            : 
     104                 :          0 :         memcpy(buffer, inquiry_msg, sizeof(inquiry_msg));
     105                 :          0 :         result = usb_stor_bulk_transfer_buf(us,
     106                 :            :                         us->send_bulk_pipe,
     107                 :            :                         buffer, sizeof(inquiry_msg), NULL);
     108         [ #  # ]:          0 :         if (result != USB_STOR_XFER_GOOD) {
     109                 :            :                 result = USB_STOR_XFER_ERROR;
     110                 :            :                 goto out;
     111                 :            :         }
     112                 :            : 
     113                 :          0 :         result = usb_stor_bulk_transfer_buf(us,
     114                 :            :                         us->recv_bulk_pipe,
     115                 :            :                         buffer, 0x24, NULL);
     116         [ #  # ]:          0 :         if (result != USB_STOR_XFER_GOOD) {
     117                 :            :                 result = USB_STOR_XFER_ERROR;
     118                 :            :                 goto out;
     119                 :            :         }
     120                 :            : 
     121                 :          0 :         result = memcmp(buffer+8, "Option", 6);
     122                 :            : 
     123         [ #  # ]:          0 :         if (result != 0)
     124                 :          0 :                 result = memcmp(buffer+8, "ZCOPTION", 8);
     125                 :            : 
     126                 :            :         /* Read the CSW */
     127                 :          0 :         usb_stor_bulk_transfer_buf(us,
     128                 :            :                         us->recv_bulk_pipe,
     129                 :            :                         buffer, 13, NULL);
     130                 :            : 
     131                 :            : out:
     132                 :          0 :         kfree(buffer);
     133                 :          0 :         return result;
     134                 :            : }
     135                 :            : 
     136                 :            : 
     137                 :          0 : int option_ms_init(struct us_data *us)
     138                 :            : {
     139                 :            :         int result;
     140                 :            : 
     141                 :            :         usb_stor_dbg(us, "Option MS: %s\n", "option_ms_init called");
     142                 :            : 
     143                 :            :         /* Additional test for vendor information via INQUIRY,
     144                 :            :          * because some vendor/product IDs are ambiguous
     145                 :            :          */
     146                 :          0 :         result = option_inquiry(us);
     147         [ #  # ]:          0 :         if (result != 0) {
     148                 :            :                 usb_stor_dbg(us, "Option MS: %s\n",
     149                 :            :                              "vendor is not Option or not determinable, no action taken");
     150                 :            :                 return 0;
     151                 :            :         } else
     152                 :            :                 usb_stor_dbg(us, "Option MS: %s\n",
     153                 :            :                              "this is a genuine Option device, proceeding");
     154                 :            : 
     155                 :            :         /* Force Modem mode */
     156         [ #  # ]:          0 :         if (option_zero_cd == ZCD_FORCE_MODEM) {
     157                 :            :                 usb_stor_dbg(us, "Option MS: %s\n", "Forcing Modem Mode");
     158                 :          0 :                 result = option_rezero(us);
     159                 :            :                 if (result != USB_STOR_XFER_GOOD)
     160                 :            :                         usb_stor_dbg(us, "Option MS: %s\n",
     161                 :            :                                      "Failed to switch to modem mode");
     162                 :          0 :                 return -EIO;
     163                 :            :         } else if (option_zero_cd == ZCD_ALLOW_MS) {
     164                 :            :                 /* Allow Mass Storage mode (keep CD-Rom) */
     165                 :            :                 usb_stor_dbg(us, "Option MS: %s\n",
     166                 :            :                              "Allowing Mass Storage Mode if device requests it");
     167                 :            :         }
     168                 :            : 
     169                 :            :         return 0;
     170                 :            : }
     171                 :            : 

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