1 // SPDX-License-Identifier: GPL-2.0 2 #include <scsi/scsi.h> 3 #include <scsi/scsi_host.h> 4 #include <scsi/scsi_cmnd.h> 5 #include <scsi/scsi_device.h> 6 #include <linux/usb.h> 7 #include <linux/module.h> 8 #include <linux/slab.h> 9 10 #include "usb.h" 11 #include "transport.h" 12 #include "protocol.h" 13 #include "scsiglue.h" 14 #include "sierra_ms.h" 15 #include "debug.h" 16 17 #define SWIMS_USB_REQUEST_SetSwocMode 0x0B 18 #define SWIMS_USB_REQUEST_GetSwocInfo 0x0A 19 #define SWIMS_USB_INDEX_SetMode 0x0000 20 #define SWIMS_SET_MODE_Modem 0x0001 21 22 #define TRU_NORMAL 0x01 23 #define TRU_FORCE_MS 0x02 24 #define TRU_FORCE_MODEM 0x03 25 26 static unsigned int swi_tru_install = 1; 27 module_param(swi_tru_install, uint, S_IRUGO | S_IWUSR); 28 MODULE_PARM_DESC(swi_tru_install, "TRU-Install mode (1=Full Logic (def)," 29 " 2=Force CD-Rom, 3=Force Modem)"); 30 31 struct swoc_info { 32 __u8 rev; 33 __u8 reserved[8]; 34 __u16 LinuxSKU; 35 __u16 LinuxVer; 36 __u8 reserved2[47]; 37 } __attribute__((__packed__)); 38 39 static bool containsFullLinuxPackage(struct swoc_info *swocInfo) 40 { 41 if ((swocInfo->LinuxSKU >= 0x2100 && swocInfo->LinuxSKU <= 0x2FFF) || 42 (swocInfo->LinuxSKU >= 0x7100 && swocInfo->LinuxSKU <= 0x7FFF)) 43 return true; 44 else 45 return false; 46 } 47 48 static int sierra_set_ms_mode(struct usb_device *udev, __u16 eSWocMode) 49 { 50 int result; 51 dev_dbg(&udev->dev, "SWIMS: %s", "DEVICE MODE SWITCH\n"); 52 result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 53 SWIMS_USB_REQUEST_SetSwocMode, /* __u8 request */ 54 USB_TYPE_VENDOR | USB_DIR_OUT, /* __u8 request type */ 55 eSWocMode, /* __u16 value */ 56 0x0000, /* __u16 index */ 57 NULL, /* void *data */ 58 0, /* __u16 size */ 59 USB_CTRL_SET_TIMEOUT); /* int timeout */ 60 return result; 61 } 62 63 64 static int sierra_get_swoc_info(struct usb_device *udev, 65 struct swoc_info *swocInfo) 66 { 67 int result; 68 69 dev_dbg(&udev->dev, "SWIMS: Attempting to get TRU-Install info\n"); 70 71 result = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 72 SWIMS_USB_REQUEST_GetSwocInfo, /* __u8 request */ 73 USB_TYPE_VENDOR | USB_DIR_IN, /* __u8 request type */ 74 0, /* __u16 value */ 75 0, /* __u16 index */ 76 (void *) swocInfo, /* void *data */ 77 sizeof(struct swoc_info), /* __u16 size */ 78 USB_CTRL_SET_TIMEOUT); /* int timeout */ 79 80 swocInfo->LinuxSKU = le16_to_cpu(swocInfo->LinuxSKU); 81 swocInfo->LinuxVer = le16_to_cpu(swocInfo->LinuxVer); 82 return result; 83 } 84 85 static void debug_swoc(const struct device *dev, struct swoc_info *swocInfo) 86 { 87 dev_dbg(dev, "SWIMS: SWoC Rev: %02d\n", swocInfo->rev); 88 dev_dbg(dev, "SWIMS: Linux SKU: %04X\n", swocInfo->LinuxSKU); 89 dev_dbg(dev, "SWIMS: Linux Version: %04X\n", swocInfo->LinuxVer); 90 } 91 92 93 static ssize_t truinst_show(struct device *dev, struct device_attribute *attr, 94 char *buf) 95 { 96 struct swoc_info *swocInfo; 97 struct usb_interface *intf = to_usb_interface(dev); 98 struct usb_device *udev = interface_to_usbdev(intf); 99 int result; 100 if (swi_tru_install == TRU_FORCE_MS) { 101 result = snprintf(buf, PAGE_SIZE, "Forced Mass Storage\n"); 102 } else { 103 swocInfo = kmalloc(sizeof(struct swoc_info), GFP_KERNEL); 104 if (!swocInfo) { 105 snprintf(buf, PAGE_SIZE, "Error\n"); 106 return -ENOMEM; 107 } 108 result = sierra_get_swoc_info(udev, swocInfo); 109 if (result < 0) { 110 dev_dbg(dev, "SWIMS: failed SWoC query\n"); 111 kfree(swocInfo); 112 snprintf(buf, PAGE_SIZE, "Error\n"); 113 return -EIO; 114 } 115 debug_swoc(dev, swocInfo); 116 result = snprintf(buf, PAGE_SIZE, 117 "REV=%02d SKU=%04X VER=%04X\n", 118 swocInfo->rev, 119 swocInfo->LinuxSKU, 120 swocInfo->LinuxVer); 121 kfree(swocInfo); 122 } 123 return result; 124 } 125 static DEVICE_ATTR_RO(truinst); 126 127 int sierra_ms_init(struct us_data *us) 128 { 129 int result, retries; 130 struct swoc_info *swocInfo; 131 struct usb_device *udev; 132 133 retries = 3; 134 result = 0; 135 udev = us->pusb_dev; 136 137 /* Force Modem mode */ 138 if (swi_tru_install == TRU_FORCE_MODEM) { 139 usb_stor_dbg(us, "SWIMS: Forcing Modem Mode\n"); 140 result = sierra_set_ms_mode(udev, SWIMS_SET_MODE_Modem); 141 if (result < 0) 142 usb_stor_dbg(us, "SWIMS: Failed to switch to modem mode\n"); 143 return -EIO; 144 } 145 /* Force Mass Storage mode (keep CD-Rom) */ 146 else if (swi_tru_install == TRU_FORCE_MS) { 147 usb_stor_dbg(us, "SWIMS: Forcing Mass Storage Mode\n"); 148 goto complete; 149 } 150 /* Normal TRU-Install Logic */ 151 else { 152 usb_stor_dbg(us, "SWIMS: Normal SWoC Logic\n"); 153 154 swocInfo = kmalloc(sizeof(struct swoc_info), 155 GFP_KERNEL); 156 if (!swocInfo) 157 return -ENOMEM; 158 159 retries = 3; 160 do { 161 retries--; 162 result = sierra_get_swoc_info(udev, swocInfo); 163 if (result < 0) { 164 usb_stor_dbg(us, "SWIMS: Failed SWoC query\n"); 165 schedule_timeout_uninterruptible(2*HZ); 166 } 167 } while (retries && result < 0); 168 169 if (result < 0) { 170 usb_stor_dbg(us, "SWIMS: Completely failed SWoC query\n"); 171 kfree(swocInfo); 172 return -EIO; 173 } 174 175 debug_swoc(&us->pusb_dev->dev, swocInfo); 176 177 /* 178 * If there is not Linux software on the TRU-Install device 179 * then switch to modem mode 180 */ 181 if (!containsFullLinuxPackage(swocInfo)) { 182 usb_stor_dbg(us, "SWIMS: Switching to Modem Mode\n"); 183 result = sierra_set_ms_mode(udev, 184 SWIMS_SET_MODE_Modem); 185 if (result < 0) 186 usb_stor_dbg(us, "SWIMS: Failed to switch modem\n"); 187 kfree(swocInfo); 188 return -EIO; 189 } 190 kfree(swocInfo); 191 } 192 complete: 193 return device_create_file(&us->pusb_intf->dev, &dev_attr_truinst); 194 } 195 196