1 #include <linux/usb.h> 2 #include <linux/usb/hcd.h> 3 #include "usb.h" 4 5 static int uas_is_interface(struct usb_host_interface *intf) 6 { 7 return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE && 8 intf->desc.bInterfaceSubClass == USB_SC_SCSI && 9 intf->desc.bInterfaceProtocol == USB_PR_UAS); 10 } 11 12 static int uas_find_uas_alt_setting(struct usb_interface *intf) 13 { 14 int i; 15 16 for (i = 0; i < intf->num_altsetting; i++) { 17 struct usb_host_interface *alt = &intf->altsetting[i]; 18 19 if (uas_is_interface(alt)) 20 return alt->desc.bAlternateSetting; 21 } 22 23 return -ENODEV; 24 } 25 26 static int uas_find_endpoints(struct usb_host_interface *alt, 27 struct usb_host_endpoint *eps[]) 28 { 29 struct usb_host_endpoint *endpoint = alt->endpoint; 30 unsigned i, n_endpoints = alt->desc.bNumEndpoints; 31 32 for (i = 0; i < n_endpoints; i++) { 33 unsigned char *extra = endpoint[i].extra; 34 int len = endpoint[i].extralen; 35 while (len >= 3) { 36 if (extra[1] == USB_DT_PIPE_USAGE) { 37 unsigned pipe_id = extra[2]; 38 if (pipe_id > 0 && pipe_id < 5) 39 eps[pipe_id - 1] = &endpoint[i]; 40 break; 41 } 42 len -= extra[0]; 43 extra += extra[0]; 44 } 45 } 46 47 if (!eps[0] || !eps[1] || !eps[2] || !eps[3]) 48 return -ENODEV; 49 50 return 0; 51 } 52 53 static int uas_use_uas_driver(struct usb_interface *intf, 54 const struct usb_device_id *id) 55 { 56 struct usb_host_endpoint *eps[4] = { }; 57 struct usb_device *udev = interface_to_usbdev(intf); 58 struct usb_hcd *hcd = bus_to_hcd(udev->bus); 59 unsigned long flags = id->driver_info; 60 int r, alt; 61 62 63 alt = uas_find_uas_alt_setting(intf); 64 if (alt < 0) 65 return 0; 66 67 r = uas_find_endpoints(&intf->altsetting[alt], eps); 68 if (r < 0) 69 return 0; 70 71 /* 72 * ASMedia has a number of usb3 to sata bridge chips, at the time of 73 * this writing the following versions exist: 74 * ASM1051 - no uas support version 75 * ASM1051 - with broken (*) uas support 76 * ASM1053 - with working uas support 77 * ASM1153 - with working uas support 78 * 79 * Devices with these chips re-use a number of device-ids over the 80 * entire line, so the device-id is useless to determine if we're 81 * dealing with an ASM1051 (which we want to avoid). 82 * 83 * The ASM1153 can be identified by config.MaxPower == 0, 84 * where as the ASM105x models have config.MaxPower == 36. 85 * 86 * Differentiating between the ASM1053 and ASM1051 is trickier, when 87 * connected over USB-3 we can look at the number of streams supported, 88 * ASM1051 supports 32 streams, where as early ASM1053 versions support 89 * 16 streams, newer ASM1053-s also support 32 streams, but have a 90 * different prod-id. 91 * 92 * (*) ASM1051 chips do work with UAS with some disks (with the 93 * US_FL_NO_REPORT_OPCODES quirk), but are broken with other disks 94 */ 95 if (le16_to_cpu(udev->descriptor.idVendor) == 0x174c && 96 (le16_to_cpu(udev->descriptor.idProduct) == 0x5106 || 97 le16_to_cpu(udev->descriptor.idProduct) == 0x55aa)) { 98 if (udev->actconfig->desc.bMaxPower == 0) { 99 /* ASM1153, do nothing */ 100 } else if (udev->speed < USB_SPEED_SUPER) { 101 /* No streams info, assume ASM1051 */ 102 flags |= US_FL_IGNORE_UAS; 103 } else if (usb_ss_max_streams(&eps[1]->ss_ep_comp) == 32) { 104 /* Possibly an ASM1051, disable uas */ 105 flags |= US_FL_IGNORE_UAS; 106 } 107 } 108 109 usb_stor_adjust_quirks(udev, &flags); 110 111 if (flags & US_FL_IGNORE_UAS) { 112 dev_warn(&udev->dev, 113 "UAS is blacklisted for this device, using usb-storage instead\n"); 114 return 0; 115 } 116 117 if (udev->bus->sg_tablesize == 0) { 118 dev_warn(&udev->dev, 119 "The driver for the USB controller %s does not support scatter-gather which is\n", 120 hcd->driver->description); 121 dev_warn(&udev->dev, 122 "required by the UAS driver. Please try an other USB controller if you wish to use UAS.\n"); 123 return 0; 124 } 125 126 if (udev->speed >= USB_SPEED_SUPER && !hcd->can_do_streams) { 127 dev_warn(&udev->dev, 128 "USB controller %s does not support streams, which are required by the UAS driver.\n", 129 hcd_to_bus(hcd)->bus_name); 130 dev_warn(&udev->dev, 131 "Please try an other USB controller if you wish to use UAS.\n"); 132 return 0; 133 } 134 135 return 1; 136 } 137