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