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         return btqcomsmd_recv(btq->hdev, HCI_EVENT_PKT, data, count);
  69 }
  70
  71 static int btqcomsmd_send(struct hci_dev *hdev, struct sk_buff *skb)
  72 {
  73         struct btqcomsmd *btq = hci_get_drvdata(hdev);
  74         int ret;
  75
  76         switch (hci_skb_pkt_type(skb)) {
  77         case HCI_ACLDATA_PKT:
  78                 ret = rpmsg_send(btq->acl_channel, skb->data, skb->len);
  79                 hdev->stat.acl_tx++;
  80                 hdev->stat.byte_tx += skb->len;
  81                 break;
  82         case HCI_COMMAND_PKT:
  83                 ret = rpmsg_send(btq->cmd_channel, skb->data, skb->len);
  84                 hdev->stat.cmd_tx++;
  85                 break;
  86         default:
  87                 ret = -EILSEQ;
  88                 break;
  89         }
  90
  91         if (!ret)
  92                 kfree_skb(skb);
  93
  94         return ret;
  95 }
  96
  97 static int btqcomsmd_open(struct hci_dev *hdev)
  98 {
  99         return 0;
 100 }
 101
 102 static int btqcomsmd_close(struct hci_dev *hdev)
 103 {
 104         return 0;
 105 }
 106
 107 static int btqcomsmd_setup(struct hci_dev *hdev)
 108 {
 109         struct btqcomsmd *btq = hci_get_drvdata(hdev);
 110         struct sk_buff *skb;
 111         int err;
 112
 113         skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
 114         if (IS_ERR(skb))
 115                 return PTR_ERR(skb);
 116         kfree_skb(skb);
 117
 118         /* Devices do not have persistent storage for BD address. If no
 119          * BD address has been retrieved during probe, mark the device
 120          * as having an invalid BD address.
 121          */
 122         if (!bacmp(&btq->bdaddr, BDADDR_ANY)) {
 123                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
 124                 return 0;
 125         }
 126
 127         /* When setting a configured BD address fails, mark the device
 128          * as having an invalid BD address.
 129          */
 130         err = qca_set_bdaddr_rome(hdev, &btq->bdaddr);
 131         if (err) {
 132                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
 133                 return 0;
 134         }
 135
 136         return 0;
 137 }
 138
 139 static int btqcomsmd_probe(struct platform_device *pdev)
 140 {
 141         struct btqcomsmd *btq;
 142         struct hci_dev *hdev;
 143         void *wcnss;
 144         int ret;
 145
 146         btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL);
 147         if (!btq)
 148                 return -ENOMEM;
 149
 150         wcnss = dev_get_drvdata(pdev->dev.parent);
 151
 152         btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL",
 153                                                    btqcomsmd_acl_callback, btq);
 154         if (IS_ERR(btq->acl_channel))
 155                 return PTR_ERR(btq->acl_channel);
 156
 157         btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD",
 158                                                    btqcomsmd_cmd_callback, btq);
 159         if (IS_ERR(btq->cmd_channel))
 160                 return PTR_ERR(btq->cmd_channel);
 161
 162         /* The local-bd-address property is usually injected by the
 163          * bootloader which has access to the allocated BD address.
 164          */
 165         if (!of_property_read_u8_array(pdev->dev.of_node, "local-bd-address",
 166                                        (u8 *)&btq->bdaddr, sizeof(bdaddr_t))) {
 167                 dev_info(&pdev->dev, "BD address %pMR retrieved from device-tree",
 168                          &btq->bdaddr);
 169         }
 170
 171         hdev = hci_alloc_dev();
 172         if (!hdev)
 173                 return -ENOMEM;
 174
 175         hci_set_drvdata(hdev, btq);
 176         btq->hdev = hdev;
 177         SET_HCIDEV_DEV(hdev, &pdev->dev);
 178
 179         hdev->bus = HCI_SMD;
 180         hdev->open = btqcomsmd_open;
 181         hdev->close = btqcomsmd_close;
 182         hdev->send = btqcomsmd_send;
 183 #ifdef CONFIG_BT_QCOMSMD_HACK
 184         if (bacmp(&btq->bdaddr, BDADDR_ANY))
 185                 hdev->setup = btqcomsmd_setup;
 186 #else
 187         hdev->setup = btqcomsmd_setup;
 188 #endif
 189         hdev->set_bdaddr = qca_set_bdaddr_rome;
 190
 191         ret = hci_register_dev(hdev);
 192         if (ret < 0) {
 193                 hci_free_dev(hdev);
 194                 return ret;
 195         }
 196
 197         platform_set_drvdata(pdev, btq);
 198
 199         return 0;
 200 }
 201
 202 static int btqcomsmd_remove(struct platform_device *pdev)
 203 {
 204         struct btqcomsmd *btq = platform_get_drvdata(pdev);
 205
 206         hci_unregister_dev(btq->hdev);
 207         hci_free_dev(btq->hdev);
 208
 209         rpmsg_destroy_ept(btq->cmd_channel);
 210         rpmsg_destroy_ept(btq->acl_channel);
 211
 212         return 0;
 213 }
 214
 215 static const struct of_device_id btqcomsmd_of_match[] = {
 216         { .compatible = "qcom,wcnss-bt", },
 217         { },
 218 };
 219 MODULE_DEVICE_TABLE(of, btqcomsmd_of_match);
 220
 221 static struct platform_driver btqcomsmd_driver = {
 222         .probe = btqcomsmd_probe,
 223         .remove = btqcomsmd_remove,
 224         .driver  = {
 225                 .name  = "btqcomsmd",
 226                 .of_match_table = btqcomsmd_of_match,
 227         },
 228 };
 229
 230 module_platform_driver(btqcomsmd_driver);
 231
 232 MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
 233 MODULE_DESCRIPTION("Qualcomm SMD HCI driver");
 234 MODULE_LICENSE("GPL v2");