drivers/usb/storage/sierra_ms.c

   1 #include <scsi/scsi.h>
   2 #include <scsi/scsi_host.h>
   3 #include <scsi/scsi_cmnd.h>
   4 #include <scsi/scsi_device.h>
   5 #include <linux/usb.h>
   6 #include <linux/slab.h>
   7
   8 #include "usb.h"
   9 #include "transport.h"
  10 #include "protocol.h"
  11 #include "scsiglue.h"
  12 #include "sierra_ms.h"
  13 #include "debug.h"
  14
  15 #define SWIMS_USB_REQUEST_SetSwocMode   0x0B
  16 #define SWIMS_USB_REQUEST_GetSwocInfo   0x0A
  17 #define SWIMS_USB_INDEX_SetMode         0x0000
  18 #define SWIMS_SET_MODE_Modem            0x0001
  19
  20 #define TRU_NORMAL                      0x01
  21 #define TRU_FORCE_MS                    0x02
  22 #define TRU_FORCE_MODEM                 0x03
  23
  24 static unsigned int swi_tru_install = 1;
  25 module_param(swi_tru_install, uint, S_IRUGO | S_IWUSR);
  26 MODULE_PARM_DESC(swi_tru_install, "TRU-Install mode (1=Full Logic (def),"
  27                  " 2=Force CD-Rom, 3=Force Modem)");
  28
  29 struct swoc_info {
  30         __u8 rev;
  31         __u8 reserved[8];
  32         __u16 LinuxSKU;
  33         __u16 LinuxVer;
  34         __u8 reserved2[47];
  35 } __attribute__((__packed__));
  36
  37 static bool containsFullLinuxPackage(struct swoc_info *swocInfo)
  38 {
  39         if ((swocInfo->LinuxSKU >= 0x2100 && swocInfo->LinuxSKU <= 0x2FFF) ||
  40            (swocInfo->LinuxSKU >= 0x7100 && swocInfo->LinuxSKU <= 0x7FFF))
  41                 return true;
  42         else
  43                 return false;
  44 }
  45
  46 static int sierra_set_ms_mode(struct usb_device *udev, __u16 eSWocMode)
  47 {
  48         int result;
  49         US_DEBUGP("SWIMS: %s", "DEVICE MODE SWITCH\n");
  50         result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  51                         SWIMS_USB_REQUEST_SetSwocMode,  /* __u8 request      */
  52                         USB_TYPE_VENDOR | USB_DIR_OUT,  /* __u8 request type */
  53                         eSWocMode,                      /* __u16 value       */
  54                         0x0000,                         /* __u16 index       */
  55                         NULL,                           /* void *data        */
  56                         0,                              /* __u16 size        */
  57                         USB_CTRL_SET_TIMEOUT);          /* int timeout       */
  58         return result;
  59 }
  60
  61
  62 static int sierra_get_swoc_info(struct usb_device *udev,
  63                                 struct swoc_info *swocInfo)
  64 {
  65         int result;
  66
  67         US_DEBUGP("SWIMS: Attempting to get TRU-Install info.\n");
  68
  69         result = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
  70                         SWIMS_USB_REQUEST_GetSwocInfo,  /* __u8 request      */
  71                         USB_TYPE_VENDOR | USB_DIR_IN,   /* __u8 request type */
  72                         0,                              /* __u16 value       */
  73                         0,                              /* __u16 index       */
  74                         (void *) swocInfo,              /* void *data        */
  75                         sizeof(struct swoc_info),       /* __u16 size        */
  76                         USB_CTRL_SET_TIMEOUT);          /* int timeout       */
  77
  78         swocInfo->LinuxSKU = le16_to_cpu(swocInfo->LinuxSKU);
  79         swocInfo->LinuxVer = le16_to_cpu(swocInfo->LinuxVer);
  80         return result;
  81 }
  82
  83 static void debug_swoc(struct swoc_info *swocInfo)
  84 {
  85         US_DEBUGP("SWIMS: SWoC Rev: %02d \n", swocInfo->rev);
  86         US_DEBUGP("SWIMS: Linux SKU: %04X \n", swocInfo->LinuxSKU);
  87         US_DEBUGP("SWIMS: Linux Version: %04X \n", swocInfo->LinuxVer);
  88 }
  89
  90
  91 static ssize_t show_truinst(struct device *dev, struct device_attribute *attr,
  92                         char *buf)
  93 {
  94         struct swoc_info *swocInfo;
  95         struct usb_interface *intf = to_usb_interface(dev);
  96         struct usb_device *udev = interface_to_usbdev(intf);
  97         int result;
  98         if (swi_tru_install == TRU_FORCE_MS) {
  99                 result = snprintf(buf, PAGE_SIZE, "Forced Mass Storage\n");
 100         } else {
 101                 swocInfo = kmalloc(sizeof(struct swoc_info), GFP_KERNEL);
 102                 if (!swocInfo) {
 103                         US_DEBUGP("SWIMS: Allocation failure\n");
 104                         snprintf(buf, PAGE_SIZE, "Error\n");
 105                         return -ENOMEM;
 106                 }
 107                 result = sierra_get_swoc_info(udev, swocInfo);
 108                 if (result < 0) {
 109                         US_DEBUGP("SWIMS: failed SWoC query\n");
 110                         kfree(swocInfo);
 111                         snprintf(buf, PAGE_SIZE, "Error\n");
 112                         return -EIO;
 113                 }
 114                 debug_swoc(swocInfo);
 115                 result = snprintf(buf, PAGE_SIZE,
 116                         "REV=%02d SKU=%04X VER=%04X\n",
 117                         swocInfo->rev,
 118                         swocInfo->LinuxSKU,
 119                         swocInfo->LinuxVer);
 120                 kfree(swocInfo);
 121         }
 122         return result;
 123 }
 124 static DEVICE_ATTR(truinst, S_IRUGO, show_truinst, NULL);
 125
 126 int sierra_ms_init(struct us_data *us)
 127 {
 128         int result, retries;
 129         struct swoc_info *swocInfo;
 130         struct usb_device *udev;
 131         struct Scsi_Host *sh;
 132         struct scsi_device *sd;
 133
 134         retries = 3;
 135         result = 0;
 136         udev = us->pusb_dev;
 137
 138         sh = us_to_host(us);
 139         sd = scsi_get_host_dev(sh);
 140
 141         US_DEBUGP("SWIMS: sierra_ms_init called\n");
 142
 143         /* Force Modem mode */
 144         if (swi_tru_install == TRU_FORCE_MODEM) {
 145                 US_DEBUGP("SWIMS: %s", "Forcing Modem Mode\n");
 146                 result = sierra_set_ms_mode(udev, SWIMS_SET_MODE_Modem);
 147                 if (result < 0)
 148                         US_DEBUGP("SWIMS: Failed to switch to modem mode.\n");
 149                 return -EIO;
 150         }
 151         /* Force Mass Storage mode (keep CD-Rom) */
 152         else if (swi_tru_install == TRU_FORCE_MS) {
 153                 US_DEBUGP("SWIMS: %s", "Forcing Mass Storage Mode\n");
 154                 goto complete;
 155         }
 156         /* Normal TRU-Install Logic */
 157         else {
 158                 US_DEBUGP("SWIMS: %s", "Normal SWoC Logic\n");
 159
 160                 swocInfo = kmalloc(sizeof(struct swoc_info),
 161                                 GFP_KERNEL);
 162                 if (!swocInfo) {
 163                         US_DEBUGP("SWIMS: %s", "Allocation failure\n");
 164                         return -ENOMEM;
 165                 }
 166
 167                 retries = 3;
 168                 do {
 169                         retries--;
 170                         result = sierra_get_swoc_info(udev, swocInfo);
 171                         if (result < 0) {
 172                                 US_DEBUGP("SWIMS: %s", "Failed SWoC query\n");
 173                                 schedule_timeout_uninterruptible(2*HZ);
 174                         }
 175                 } while (retries && result < 0);
 176
 177                 if (result < 0) {
 178                         US_DEBUGP("SWIMS: %s",
 179                                   "Completely failed SWoC query\n");
 180                         kfree(swocInfo);
 181                         return -EIO;
 182                 }
 183
 184                 debug_swoc(swocInfo);
 185
 186                 /* If there is not Linux software on the TRU-Install device
 187                  * then switch to modem mode
 188                  */
 189                 if (!containsFullLinuxPackage(swocInfo)) {
 190                         US_DEBUGP("SWIMS: %s",
 191                                 "Switching to Modem Mode\n");
 192                         result = sierra_set_ms_mode(udev,
 193                                 SWIMS_SET_MODE_Modem);
 194                         if (result < 0)
 195                                 US_DEBUGP("SWIMS: Failed to switch modem\n");
 196                         kfree(swocInfo);
 197                         return -EIO;
 198                 }
 199                 kfree(swocInfo);
 200         }
 201 complete:
 202         result = device_create_file(&us->pusb_intf->dev, &dev_attr_truinst);
 203
 204         return 0;
 205 }
 206