ualea.c revision 1.3
1 /* $NetBSD: ualea.c,v 1.3 2017/04/17 15:43:40 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: ualea.c,v 1.3 2017/04/17 15:43:40 riastradh Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/atomic.h> 37 #include <sys/device_if.h> 38 #include <sys/kmem.h> 39 #include <sys/rndpool.h> 40 #include <sys/rndsource.h> 41 42 #include <dev/usb/usb.h> 43 #include <dev/usb/usbdevs.h> 44 #include <dev/usb/usbdi.h> 45 #include <dev/usb/usbdi_util.h> 46 47 struct ualea_softc { 48 device_t sc_dev; 49 struct usbd_device *sc_udev; 50 struct usbd_interface *sc_uif; 51 kmutex_t sc_lock; 52 krndsource_t sc_rnd; 53 uint16_t sc_maxpktsize; 54 struct usbd_pipe *sc_pipe; 55 struct usbd_xfer *sc_xfer; 56 bool sc_attached:1; 57 bool sc_inflight:1; 58 /* lock covers sc_attached, sc_inflight, and usbd_transfer(sc_xfer) */ 59 }; 60 61 static int ualea_match(device_t, cfdata_t, void *); 62 static void ualea_attach(device_t, device_t, void *); 63 static int ualea_detach(device_t, int); 64 static void ualea_get(size_t, void *); 65 static void ualea_xfer_done(struct usbd_xfer *, void *, usbd_status); 66 67 CFATTACH_DECL_NEW(ualea, sizeof(struct ualea_softc), 68 ualea_match, ualea_attach, ualea_detach, NULL); 69 70 static const struct usb_devno ualea_devs[] = { 71 { USB_VENDOR_ARANEUS, USB_PRODUCT_ARANEUS_ALEA_II }, 72 }; 73 74 static int 75 ualea_match(device_t parent, cfdata_t match, void *aux) 76 { 77 struct usbif_attach_arg *uiaa = aux; 78 79 if (usb_lookup(ualea_devs, uiaa->uiaa_vendor, uiaa->uiaa_product)) 80 return UMATCH_VENDOR_PRODUCT; 81 82 return UMATCH_NONE; 83 } 84 85 static void 86 ualea_attach(device_t parent, device_t self, void *aux) 87 { 88 struct usbif_attach_arg *uiaa = aux; 89 struct ualea_softc *sc = device_private(self); 90 struct usbd_device *udev = uiaa->uiaa_device; 91 struct usbd_interface *uif = uiaa->uiaa_iface; 92 const usb_endpoint_descriptor_t *ed; 93 char *devinfop; 94 usbd_status status; 95 96 aprint_naive("\n"); 97 aprint_normal("\n"); 98 99 devinfop = usbd_devinfo_alloc(udev, 0); 100 aprint_normal_dev(self, "%s\n", devinfop); 101 usbd_devinfo_free(devinfop); 102 103 sc->sc_dev = self; 104 sc->sc_udev = udev; 105 sc->sc_uif = uif; 106 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_USB); 107 rndsource_setcb(&sc->sc_rnd, ualea_get, sc); 108 rnd_attach_source(&sc->sc_rnd, device_xname(self), RND_TYPE_RNG, 109 RND_FLAG_COLLECT_VALUE|RND_FLAG_HASCB); 110 111 ed = usbd_interface2endpoint_descriptor(uif, 0); 112 if (ed == NULL) { 113 aprint_error_dev(sc->sc_dev, "failed to read endpoint 0\n"); 114 return; 115 } 116 if (UE_GET_DIR(ed->bEndpointAddress) != UE_DIR_IN || 117 UE_GET_XFERTYPE(ed->bmAttributes) != UE_BULK) { 118 aprint_error_dev(sc->sc_dev, "invalid endpoint\n"); 119 return; 120 } 121 122 sc->sc_maxpktsize = UGETW(ed->wMaxPacketSize); 123 124 status = usbd_open_pipe(uif, ed->bEndpointAddress, 125 USBD_EXCLUSIVE_USE|USBD_MPSAFE, &sc->sc_pipe); 126 if (status) { 127 aprint_error_dev(sc->sc_dev, "failed to open pipe: %d\n", 128 status); 129 return; 130 } 131 132 status = usbd_create_xfer(sc->sc_pipe, sc->sc_maxpktsize, 133 USBD_SHORT_XFER_OK, 0, &sc->sc_xfer); 134 if (status) { 135 aprint_error_dev(sc->sc_dev, "failed to create xfer: %d\n", 136 status); 137 return; 138 } 139 140 usbd_setup_xfer(sc->sc_xfer, sc, usbd_get_buffer(sc->sc_xfer), 141 sc->sc_maxpktsize, USBD_SHORT_XFER_OK, USBD_NO_TIMEOUT, 142 ualea_xfer_done); 143 144 /* Success! We are ready to run. */ 145 mutex_enter(&sc->sc_lock); 146 sc->sc_attached = true; 147 mutex_exit(&sc->sc_lock); 148 149 /* Get some initial entropy now. */ 150 ualea_get(RND_POOLBITS/NBBY, sc); 151 } 152 153 static int 154 ualea_detach(device_t self, int flags) 155 { 156 struct ualea_softc *sc = device_private(self); 157 158 /* Prevent new use of xfer. */ 159 mutex_enter(&sc->sc_lock); 160 sc->sc_attached = false; 161 mutex_exit(&sc->sc_lock); 162 163 /* Cancel pending xfer. */ 164 if (sc->sc_pipe) 165 (void)usbd_abort_pipe(sc->sc_pipe); 166 KASSERT(!sc->sc_inflight); 167 168 /* All users have drained. Tear it all down. */ 169 if (sc->sc_xfer) 170 usbd_destroy_xfer(sc->sc_xfer); 171 if (sc->sc_pipe) 172 (void)usbd_close_pipe(sc->sc_pipe); 173 rnd_detach_source(&sc->sc_rnd); 174 mutex_destroy(&sc->sc_lock); 175 176 return 0; 177 } 178 179 static void 180 ualea_get(size_t nbytes, void *cookie) 181 { 182 struct ualea_softc *sc = cookie; 183 usbd_status status; 184 185 mutex_enter(&sc->sc_lock); 186 if (!sc->sc_attached) 187 goto out; 188 if (sc->sc_inflight) 189 goto out; 190 sc->sc_inflight = true; 191 status = usbd_transfer(sc->sc_xfer); 192 if (status && status != USBD_IN_PROGRESS) { 193 aprint_error_dev(sc->sc_dev, "failed to issue xfer: %d\n", 194 status); 195 /* We failed -- let someone else have a go. */ 196 sc->sc_inflight = false; 197 } 198 out: mutex_exit(&sc->sc_lock); 199 } 200 201 static void 202 ualea_xfer_done(struct usbd_xfer *xfer, void *cookie, usbd_status status) 203 { 204 struct ualea_softc *sc = cookie; 205 void *pkt; 206 uint32_t pktsize; 207 208 /* Check the transfer status. */ 209 if (status) { 210 aprint_error_dev(sc->sc_dev, "xfer failed: %d\n", status); 211 goto out; 212 } 213 214 /* Get and sanity-check the transferred size. */ 215 usbd_get_xfer_status(xfer, NULL, &pkt, &pktsize, NULL); 216 if (pktsize > sc->sc_maxpktsize) { 217 aprint_error_dev(sc->sc_dev, 218 "bogus packet size: %"PRIu32" > %"PRIu16" (max), ignoring" 219 "\n", 220 pktsize, sc->sc_maxpktsize); 221 goto out; 222 } 223 224 /* Add the data to the pool. */ 225 rnd_add_data(&sc->sc_rnd, pkt, pktsize, NBBY*pktsize); 226 227 out: 228 /* Allow subsequent transfers. */ 229 mutex_enter(&sc->sc_lock); 230 sc->sc_inflight = false; 231 mutex_exit(&sc->sc_lock); 232 } 233
Indexes created Tue Sep 30 20:09:53 GMT 2025