drivers/bluetooth/btqcomsmd.c

   1 /*
   2  * Copyright (c) 2016, Linaro Ltd.
   3  * Copyright (c) 2015, Sony Mobile Communications Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 and
   7  * only version 2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/rpmsg.h>
  18 #include <linux/of.h>
  19
  20 #include <linux/soc/qcom/wcnss_ctrl.h>
  21 #include <linux/platform_device.h>
  22
  23 #include <net/bluetooth/bluetooth.h>
  24 #include <net/bluetooth/hci_core.h>
  25
  26 #include "btqca.h"
  27
  28 struct btqcomsmd {
  29         struct hci_dev *hdev;
  30
  31         bdaddr_t bdaddr;
  32         struct rpmsg_endpoint *acl_channel;
  33         struct rpmsg_endpoint *cmd_channel;
  34 };
  35
  36 static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type,
  37                            const void *data, size_t count)
  38 {
  39         struct sk_buff *skb;
  40
  41         /* Use GFP_ATOMIC as we're in IRQ context */
  42         skb = bt_skb_alloc(count, GFP_ATOMIC);
  43         if (!skb) {
  44                 hdev->stat.err_rx++;
  45                 return -ENOMEM;
  46         }
  47
  48         hci_skb_pkt_type(skb) = type;
  49         skb_put_data(skb, data, count);
  50
  51         return hci_recv_frame(hdev, skb);
  52 }
  53
  54 static int btqcomsmd_acl_callback(struct rpmsg_device *rpdev, void *data,
  55                                   int count, void *priv, u32 addr)
  56 {
  57         struct btqcomsmd *btq = priv;
  58
  59         btq->hdev->stat.byte_rx += count;
  60         return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count);
  61 }
  62
  63 static int btqcomsmd_cmd_callback(struct rpmsg_device *rpdev, void *data,
  64                                   int count, void *priv, u32 addr)
  65 {
  66         struct btqcomsmd *btq = priv;
  67
  68         btq->hdev->stat.byte_rx += count;
  69         return btqcomsmd_recv(btq->hdev, HCI_EVENT_PKT, data, count);
  70 }
  71
  72 static int btqcomsmd_send(struct hci_dev *hdev, struct sk_buff *skb)
  73 {
  74         struct btqcomsmd *btq = hci_get_drvdata(hdev);
  75         int ret;
  76
  77         switch (hci_skb_pkt_type(skb)) {
  78         case HCI_ACLDATA_PKT:
  79                 ret = rpmsg_send(btq->acl_channel, skb->data, skb->len);
  80                 if (ret) {
  81                         hdev->stat.err_tx++;
  82                         break;
  83                 }
  84                 hdev->stat.acl_tx++;
  85                 hdev->stat.byte_tx += skb->len;
  86                 break;
  87         case HCI_COMMAND_PKT:
  88                 ret = rpmsg_send(btq->cmd_channel, skb->data, skb->len);
  89                 if (ret) {
  90                         hdev->stat.err_tx++;
  91                         break;
  92                 }
  93                 hdev->stat.cmd_tx++;
  94                 hdev->stat.byte_tx += skb->len;
  95                 break;
  96         default:
  97                 ret = -EILSEQ;
  98                 break;
  99         }
 100
 101         if (!ret)
 102                 kfree_skb(skb);
 103
 104         return ret;
 105 }
 106
 107 static int btqcomsmd_open(struct hci_dev *hdev)
 108 {
 109         return 0;
 110 }
 111
 112 static int btqcomsmd_close(struct hci_dev *hdev)
 113 {
 114         return 0;
 115 }
 116
 117 static int btqcomsmd_setup(struct hci_dev *hdev)
 118 {
 119         struct btqcomsmd *btq = hci_get_drvdata(hdev);
 120         struct sk_buff *skb;
 121         int err;
 122
 123         skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
 124         if (IS_ERR(skb))
 125                 return PTR_ERR(skb);
 126         kfree_skb(skb);
 127
 128         /* Devices do not have persistent storage for BD address. If no
 129          * BD address has been retrieved during probe, mark the device
 130          * as having an invalid BD address.
 131          */
 132         if (!bacmp(&btq->bdaddr, BDADDR_ANY)) {
 133                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
 134                 return 0;
 135         }
 136
 137         /* When setting a configured BD address fails, mark the device
 138          * as having an invalid BD address.
 139          */
 140         err = qca_set_bdaddr_rome(hdev, &btq->bdaddr);
 141         if (err) {
 142                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
 143                 return 0;
 144         }
 145
 146         return 0;
 147 }
 148
 149 static int btqcomsmd_probe(struct platform_device *pdev)
 150 {
 151         struct btqcomsmd *btq;
 152         struct hci_dev *hdev;
 153         void *wcnss;
 154         int ret;
 155
 156         btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL);
 157         if (!btq)
 158                 return -ENOMEM;
 159
 160         wcnss = dev_get_drvdata(pdev->dev.parent);
 161
 162         btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL",
 163                                                    btqcomsmd_acl_callback, btq);
 164         if (IS_ERR(btq->acl_channel))
 165                 return PTR_ERR(btq->acl_channel);
 166
 167         btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD",
 168                                                    btqcomsmd_cmd_callback, btq);
 169         if (IS_ERR(btq->cmd_channel))
 170                 return PTR_ERR(btq->cmd_channel);
 171
 172         /* The local-bd-address property is usually injected by the
 173          * bootloader which has access to the allocated BD address.
 174          */
 175         if (!of_property_read_u8_array(pdev->dev.of_node, "local-bd-address",
 176                                        (u8 *)&btq->bdaddr, sizeof(bdaddr_t))) {
 177                 dev_info(&pdev->dev, "BD address %pMR retrieved from device-tree",
 178                          &btq->bdaddr);
 179         }
 180
 181         hdev = hci_alloc_dev();
 182         if (!hdev)
 183                 return -ENOMEM;
 184
 185         hci_set_drvdata(hdev, btq);
 186         btq->hdev = hdev;
 187         SET_HCIDEV_DEV(hdev, &pdev->dev);
 188
 189         hdev->bus = HCI_SMD;
 190         hdev->open = btqcomsmd_open;
 191         hdev->close = btqcomsmd_close;
 192         hdev->send = btqcomsmd_send;
 193         hdev->setup = btqcomsmd_setup;
 194         hdev->set_bdaddr = qca_set_bdaddr_rome;
 195
 196         ret = hci_register_dev(hdev);
 197         if (ret < 0) {
 198                 hci_free_dev(hdev);
 199                 return ret;
 200         }
 201
 202         platform_set_drvdata(pdev, btq);
 203
 204         return 0;
 205 }
 206
 207 static int btqcomsmd_remove(struct platform_device *pdev)
 208 {
 209         struct btqcomsmd *btq = platform_get_drvdata(pdev);
 210
 211         hci_unregister_dev(btq->hdev);
 212         hci_free_dev(btq->hdev);
 213
 214         rpmsg_destroy_ept(btq->cmd_channel);
 215         rpmsg_destroy_ept(btq->acl_channel);
 216
 217         return 0;
 218 }
 219
 220 static const struct of_device_id btqcomsmd_of_match[] = {
 221         { .compatible = "qcom,wcnss-bt", },
 222         { },
 223 };
 224 MODULE_DEVICE_TABLE(of, btqcomsmd_of_match);
 225
 226 static struct platform_driver btqcomsmd_driver = {
 227         .probe = btqcomsmd_probe,
 228         .remove = btqcomsmd_remove,
 229         .driver  = {
 230                 .name  = "btqcomsmd",
 231                 .of_match_table = btqcomsmd_of_match,
 232         },
 233 };
 234
 235 module_platform_driver(btqcomsmd_driver);
 236
 237 MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
 238 MODULE_DESCRIPTION("Qualcomm SMD HCI driver");
 239 MODULE_LICENSE("GPL v2");