drivers/bluetooth/hci_ag6xx.c

   1 /*
   2  *
   3  *  Bluetooth HCI UART driver for Intel/AG6xx devices
   4  *
   5  *  Copyright (C) 2016  Intel Corporation
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/errno.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/firmware.h>
  28 #include <linux/module.h>
  29 #include <linux/tty.h>
  30
  31 #include <net/bluetooth/bluetooth.h>
  32 #include <net/bluetooth/hci_core.h>
  33
  34 #include "hci_uart.h"
  35 #include "btintel.h"
  36
  37 struct ag6xx_data {
  38         struct sk_buff *rx_skb;
  39         struct sk_buff_head txq;
  40 };
  41
  42 struct pbn_entry {
  43         __le32 addr;
  44         __le32 plen;
  45         __u8 data[0];
  46 } __packed;
  47
  48 static int ag6xx_open(struct hci_uart *hu)
  49 {
  50         struct ag6xx_data *ag6xx;
  51
  52         BT_DBG("hu %p", hu);
  53
  54         ag6xx = kzalloc(sizeof(*ag6xx), GFP_KERNEL);
  55         if (!ag6xx)
  56                 return -ENOMEM;
  57
  58         skb_queue_head_init(&ag6xx->txq);
  59
  60         hu->priv = ag6xx;
  61         return 0;
  62 }
  63
  64 static int ag6xx_close(struct hci_uart *hu)
  65 {
  66         struct ag6xx_data *ag6xx = hu->priv;
  67
  68         BT_DBG("hu %p", hu);
  69
  70         skb_queue_purge(&ag6xx->txq);
  71         kfree_skb(ag6xx->rx_skb);
  72         kfree(ag6xx);
  73
  74         hu->priv = NULL;
  75         return 0;
  76 }
  77
  78 static int ag6xx_flush(struct hci_uart *hu)
  79 {
  80         struct ag6xx_data *ag6xx = hu->priv;
  81
  82         BT_DBG("hu %p", hu);
  83
  84         skb_queue_purge(&ag6xx->txq);
  85         return 0;
  86 }
  87
  88 static struct sk_buff *ag6xx_dequeue(struct hci_uart *hu)
  89 {
  90         struct ag6xx_data *ag6xx = hu->priv;
  91         struct sk_buff *skb;
  92
  93         skb = skb_dequeue(&ag6xx->txq);
  94         if (!skb)
  95                 return skb;
  96
  97         /* Prepend skb with frame type */
  98         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
  99         return skb;
 100 }
 101
 102 static int ag6xx_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 103 {
 104         struct ag6xx_data *ag6xx = hu->priv;
 105
 106         skb_queue_tail(&ag6xx->txq, skb);
 107         return 0;
 108 }
 109
 110 static const struct h4_recv_pkt ag6xx_recv_pkts[] = {
 111         { H4_RECV_ACL,    .recv = hci_recv_frame   },
 112         { H4_RECV_SCO,    .recv = hci_recv_frame   },
 113         { H4_RECV_EVENT,  .recv = hci_recv_frame   },
 114 };
 115
 116 static int ag6xx_recv(struct hci_uart *hu, const void *data, int count)
 117 {
 118         struct ag6xx_data *ag6xx = hu->priv;
 119
 120         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 121                 return -EUNATCH;
 122
 123         ag6xx->rx_skb = h4_recv_buf(hu->hdev, ag6xx->rx_skb, data, count,
 124                                     ag6xx_recv_pkts,
 125                                     ARRAY_SIZE(ag6xx_recv_pkts));
 126         if (IS_ERR(ag6xx->rx_skb)) {
 127                 int err = PTR_ERR(ag6xx->rx_skb);
 128                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 129                 ag6xx->rx_skb = NULL;
 130                 return err;
 131         }
 132
 133         return count;
 134 }
 135
 136 static int intel_mem_write(struct hci_dev *hdev, u32 addr, u32 plen,
 137                            const void *data)
 138 {
 139         /* Can write a maximum of 247 bytes per HCI command.
 140          * HCI cmd Header (3), Intel mem write header (6), data (247).
 141          */
 142         while (plen > 0) {
 143                 struct sk_buff *skb;
 144                 u8 cmd_param[253], fragment_len = (plen > 247) ? 247 : plen;
 145                 __le32 leaddr = cpu_to_le32(addr);
 146
 147                 memcpy(cmd_param, &leaddr, 4);
 148                 cmd_param[4] = 0;
 149                 cmd_param[5] = fragment_len;
 150                 memcpy(cmd_param + 6, data, fragment_len);
 151
 152                 skb = __hci_cmd_sync(hdev, 0xfc8e, fragment_len + 6, cmd_param,
 153                                      HCI_INIT_TIMEOUT);
 154                 if (IS_ERR(skb))
 155                         return PTR_ERR(skb);
 156                 kfree_skb(skb);
 157
 158                 plen -= fragment_len;
 159                 data += fragment_len;
 160                 addr += fragment_len;
 161         }
 162
 163         return 0;
 164 }
 165
 166 static int ag6xx_setup(struct hci_uart *hu)
 167 {
 168         struct hci_dev *hdev = hu->hdev;
 169         struct sk_buff *skb;
 170         struct intel_version ver;
 171         const struct firmware *fw;
 172         const u8 *fw_ptr;
 173         char fwname[64];
 174         bool patched = false;
 175         int err;
 176
 177         err = btintel_enter_mfg(hdev);
 178         if (err)
 179                 return err;
 180
 181         err = btintel_read_version(hdev, &ver);
 182         if (err)
 183                 return err;
 184
 185         btintel_version_info(hdev, &ver);
 186
 187         /* The hardware platform number has a fixed value of 0x37 and
 188          * for now only accept this single value.
 189          */
 190         if (ver.hw_platform != 0x37) {
 191                 bt_dev_err(hdev, "Unsupported Intel hardware platform: 0x%X",
 192                            ver.hw_platform);
 193                 return -EINVAL;
 194         }
 195
 196         /* Only the hardware variant iBT 2.1 (AG6XX) is supported by this
 197          * firmware setup method.
 198          */
 199         if (ver.hw_variant != 0x0a) {
 200                 bt_dev_err(hdev, "Unsupported Intel hardware variant: 0x%x",
 201                            ver.hw_variant);
 202                 return -EINVAL;
 203         }
 204
 205         snprintf(fwname, sizeof(fwname), "intel/ibt-hw-%x.%x.bddata",
 206                  ver.hw_platform, ver.hw_variant);
 207
 208         err = request_firmware(&fw, fwname, &hdev->dev);
 209         if (err < 0) {
 210                 bt_dev_err(hdev, "Failed to open Intel bddata file: %s (%d)",
 211                            fwname, err);
 212                 goto patch;
 213         }
 214         fw_ptr = fw->data;
 215
 216         bt_dev_info(hdev, "Applying bddata (%s)", fwname);
 217
 218         skb = __hci_cmd_sync_ev(hdev, 0xfc2f, fw->size, fw->data,
 219                                 HCI_EV_CMD_STATUS, HCI_CMD_TIMEOUT);
 220         if (IS_ERR(skb)) {
 221                 bt_dev_err(hdev, "Applying bddata failed (%ld)", PTR_ERR(skb));
 222                 release_firmware(fw);
 223                 return PTR_ERR(skb);
 224         }
 225         kfree_skb(skb);
 226
 227         release_firmware(fw);
 228
 229 patch:
 230         /* If there is no applied patch, fw_patch_num is always 0x00. In other
 231          * cases, current firmware is already patched. No need to patch it.
 232          */
 233         if (ver.fw_patch_num) {
 234                 bt_dev_info(hdev, "Device is already patched. patch num: %02x",
 235                             ver.fw_patch_num);
 236                 patched = true;
 237                 goto complete;
 238         }
 239
 240         snprintf(fwname, sizeof(fwname),
 241                  "intel/ibt-hw-%x.%x.%x-fw-%x.%x.%x.%x.%x.pbn",
 242                  ver.hw_platform, ver.hw_variant, ver.hw_revision,
 243                  ver.fw_variant,  ver.fw_revision, ver.fw_build_num,
 244                  ver.fw_build_ww, ver.fw_build_yy);
 245
 246         err = request_firmware(&fw, fwname, &hdev->dev);
 247         if (err < 0) {
 248                 bt_dev_err(hdev, "Failed to open Intel patch file: %s(%d)",
 249                            fwname, err);
 250                 goto complete;
 251         }
 252         fw_ptr = fw->data;
 253
 254         bt_dev_info(hdev, "Patching firmware file (%s)", fwname);
 255
 256         /* PBN patch file contains a list of binary patches to be applied on top
 257          * of the embedded firmware. Each patch entry header contains the target
 258          * address and patch size.
 259          *
 260          * Patch entry:
 261          * | addr(le) | patch_len(le) | patch_data |
 262          * | 4 Bytes  |    4 Bytes    |   n Bytes  |
 263          *
 264          * PBN file is terminated by a patch entry whose address is 0xffffffff.
 265          */
 266         while (fw->size > fw_ptr - fw->data) {
 267                 struct pbn_entry *pbn = (void *)fw_ptr;
 268                 u32 addr, plen;
 269
 270                 if (pbn->addr == 0xffffffff) {
 271                         bt_dev_info(hdev, "Patching complete");
 272                         patched = true;
 273                         break;
 274                 }
 275
 276                 addr = le32_to_cpu(pbn->addr);
 277                 plen = le32_to_cpu(pbn->plen);
 278
 279                 if (fw->data + fw->size <= pbn->data + plen) {
 280                         bt_dev_info(hdev, "Invalid patch len (%d)", plen);
 281                         break;
 282                 }
 283
 284                 bt_dev_info(hdev, "Patching %td/%zu", (fw_ptr - fw->data),
 285                             fw->size);
 286
 287                 err = intel_mem_write(hdev, addr, plen, pbn->data);
 288                 if (err) {
 289                         bt_dev_err(hdev, "Patching failed");
 290                         break;
 291                 }
 292
 293                 fw_ptr = pbn->data + plen;
 294         }
 295
 296         release_firmware(fw);
 297
 298 complete:
 299         /* Exit manufacturing mode and reset */
 300         err = btintel_exit_mfg(hdev, true, patched);
 301
 302         return err;
 303 }
 304
 305 static const struct hci_uart_proto ag6xx_proto = {
 306         .id             = HCI_UART_AG6XX,
 307         .name           = "AG6XX",
 308         .manufacturer   = 2,
 309         .open           = ag6xx_open,
 310         .close          = ag6xx_close,
 311         .flush          = ag6xx_flush,
 312         .setup          = ag6xx_setup,
 313         .recv           = ag6xx_recv,
 314         .enqueue        = ag6xx_enqueue,
 315         .dequeue        = ag6xx_dequeue,
 316 };
 317
 318 int __init ag6xx_init(void)
 319 {
 320         return hci_uart_register_proto(&ag6xx_proto);
 321 }
 322
 323 int __exit ag6xx_deinit(void)
 324 {
 325         return hci_uart_unregister_proto(&ag6xx_proto);
 326 }