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