// SPDX-License-Identifier: GPL-2.0
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <linux/usb.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include "usb.h"
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#include "transport.h"
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#include "protocol.h"
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#include "scsiglue.h"
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#include "sierra_ms.h"
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#include "debug.h"
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#define SWIMS_USB_REQUEST_SetSwocMode 0x0B
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#define SWIMS_USB_REQUEST_GetSwocInfo 0x0A
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#define SWIMS_USB_INDEX_SetMode 0x0000
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#define SWIMS_SET_MODE_Modem 0x0001
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#define TRU_NORMAL 0x01
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#define TRU_FORCE_MS 0x02
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#define TRU_FORCE_MODEM 0x03
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static unsigned int swi_tru_install = 1;
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module_param(swi_tru_install, uint, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(swi_tru_install, "TRU-Install mode (1=Full Logic (def),"
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" 2=Force CD-Rom, 3=Force Modem)");
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struct swoc_info {
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__u8 rev;
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__u8 reserved[8];
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__u16 LinuxSKU;
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__u16 LinuxVer;
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__u8 reserved2[47];
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} __attribute__((__packed__));
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static bool containsFullLinuxPackage(struct swoc_info *swocInfo)
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{
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if ((swocInfo->LinuxSKU >= 0x2100 && swocInfo->LinuxSKU <= 0x2FFF) ||
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(swocInfo->LinuxSKU >= 0x7100 && swocInfo->LinuxSKU <= 0x7FFF))
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return true;
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else
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return false;
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}
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static int sierra_set_ms_mode(struct usb_device *udev, __u16 eSWocMode)
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{
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int result;
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dev_dbg(&udev->dev, "SWIMS: %s", "DEVICE MODE SWITCH\n");
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result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
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SWIMS_USB_REQUEST_SetSwocMode, /* __u8 request */
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USB_TYPE_VENDOR | USB_DIR_OUT, /* __u8 request type */
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eSWocMode, /* __u16 value */
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0x0000, /* __u16 index */
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NULL, /* void *data */
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0, /* __u16 size */
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USB_CTRL_SET_TIMEOUT); /* int timeout */
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return result;
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}
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static int sierra_get_swoc_info(struct usb_device *udev,
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struct swoc_info *swocInfo)
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{
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int result;
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dev_dbg(&udev->dev, "SWIMS: Attempting to get TRU-Install info\n");
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result = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
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SWIMS_USB_REQUEST_GetSwocInfo, /* __u8 request */
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USB_TYPE_VENDOR | USB_DIR_IN, /* __u8 request type */
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0, /* __u16 value */
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0, /* __u16 index */
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(void *) swocInfo, /* void *data */
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sizeof(struct swoc_info), /* __u16 size */
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USB_CTRL_SET_TIMEOUT); /* int timeout */
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swocInfo->LinuxSKU = le16_to_cpu(swocInfo->LinuxSKU);
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swocInfo->LinuxVer = le16_to_cpu(swocInfo->LinuxVer);
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return result;
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}
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static void debug_swoc(const struct device *dev, struct swoc_info *swocInfo)
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{
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dev_dbg(dev, "SWIMS: SWoC Rev: %02d\n", swocInfo->rev);
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dev_dbg(dev, "SWIMS: Linux SKU: %04X\n", swocInfo->LinuxSKU);
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dev_dbg(dev, "SWIMS: Linux Version: %04X\n", swocInfo->LinuxVer);
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}
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static ssize_t truinst_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct swoc_info *swocInfo;
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_device *udev = interface_to_usbdev(intf);
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int result;
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if (swi_tru_install == TRU_FORCE_MS) {
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result = snprintf(buf, PAGE_SIZE, "Forced Mass Storage\n");
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} else {
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swocInfo = kmalloc(sizeof(struct swoc_info), GFP_KERNEL);
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if (!swocInfo) {
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snprintf(buf, PAGE_SIZE, "Error\n");
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return -ENOMEM;
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}
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result = sierra_get_swoc_info(udev, swocInfo);
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if (result < 0) {
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dev_dbg(dev, "SWIMS: failed SWoC query\n");
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kfree(swocInfo);
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snprintf(buf, PAGE_SIZE, "Error\n");
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return -EIO;
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}
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debug_swoc(dev, swocInfo);
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result = snprintf(buf, PAGE_SIZE,
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"REV=%02d SKU=%04X VER=%04X\n",
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swocInfo->rev,
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swocInfo->LinuxSKU,
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swocInfo->LinuxVer);
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kfree(swocInfo);
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}
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return result;
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}
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static DEVICE_ATTR_RO(truinst);
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int sierra_ms_init(struct us_data *us)
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{
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int result, retries;
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struct swoc_info *swocInfo;
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struct usb_device *udev;
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retries = 3;
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result = 0;
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udev = us->pusb_dev;
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/* Force Modem mode */
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if (swi_tru_install == TRU_FORCE_MODEM) {
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usb_stor_dbg(us, "SWIMS: Forcing Modem Mode\n");
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result = sierra_set_ms_mode(udev, SWIMS_SET_MODE_Modem);
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if (result < 0)
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usb_stor_dbg(us, "SWIMS: Failed to switch to modem mode\n");
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return -EIO;
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}
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/* Force Mass Storage mode (keep CD-Rom) */
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else if (swi_tru_install == TRU_FORCE_MS) {
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usb_stor_dbg(us, "SWIMS: Forcing Mass Storage Mode\n");
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goto complete;
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}
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/* Normal TRU-Install Logic */
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else {
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usb_stor_dbg(us, "SWIMS: Normal SWoC Logic\n");
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swocInfo = kmalloc(sizeof(struct swoc_info),
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GFP_KERNEL);
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if (!swocInfo)
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return -ENOMEM;
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retries = 3;
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do {
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retries--;
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result = sierra_get_swoc_info(udev, swocInfo);
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if (result < 0) {
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usb_stor_dbg(us, "SWIMS: Failed SWoC query\n");
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schedule_timeout_uninterruptible(2*HZ);
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}
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} while (retries && result < 0);
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if (result < 0) {
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usb_stor_dbg(us, "SWIMS: Completely failed SWoC query\n");
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kfree(swocInfo);
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return -EIO;
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}
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debug_swoc(&us->pusb_dev->dev, swocInfo);
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/*
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* If there is not Linux software on the TRU-Install device
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* then switch to modem mode
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*/
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if (!containsFullLinuxPackage(swocInfo)) {
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usb_stor_dbg(us, "SWIMS: Switching to Modem Mode\n");
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result = sierra_set_ms_mode(udev,
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SWIMS_SET_MODE_Modem);
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if (result < 0)
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usb_stor_dbg(us, "SWIMS: Failed to switch modem\n");
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kfree(swocInfo);
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return -EIO;
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}
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kfree(swocInfo);
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}
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complete:
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return device_create_file(&us->pusb_intf->dev, &dev_attr_truinst);
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}
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