drivers/bluetooth/btqcomsmd.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2016, Linaro Ltd.
   4  * Copyright (c) 2015, Sony Mobile Communications Inc.
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/slab.h>
   9 #include <linux/rpmsg.h>
  10 #include <linux/of.h>
  11
  12 #include <linux/soc/qcom/wcnss_ctrl.h>
  13 #include <linux/platform_device.h>
  14
  15 #include <net/bluetooth/bluetooth.h>
  16 #include <net/bluetooth/hci_core.h>
  17
  18 #include "btqca.h"
  19
  20 struct btqcomsmd {
  21         struct hci_dev *hdev;
  22
  23         struct rpmsg_endpoint *acl_channel;
  24         struct rpmsg_endpoint *cmd_channel;
  25 };
  26
  27 static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type,
  28                            const void *data, size_t count)
  29 {
  30         struct sk_buff *skb;
  31
  32         /* Use GFP_ATOMIC as we're in IRQ context */
  33         skb = bt_skb_alloc(count, GFP_ATOMIC);
  34         if (!skb) {
  35                 hdev->stat.err_rx++;
  36                 return -ENOMEM;
  37         }
  38
  39         hci_skb_pkt_type(skb) = type;
  40         skb_put_data(skb, data, count);
  41
  42         return hci_recv_frame(hdev, skb);
  43 }
  44
  45 static int btqcomsmd_acl_callback(struct rpmsg_device *rpdev, void *data,
  46                                   int count, void *priv, u32 addr)
  47 {
  48         struct btqcomsmd *btq = priv;
  49
  50         btq->hdev->stat.byte_rx += count;
  51         return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count);
  52 }
  53
  54 static int btqcomsmd_cmd_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_EVENT_PKT, data, count);
  61 }
  62
  63 static int btqcomsmd_send(struct hci_dev *hdev, struct sk_buff *skb)
  64 {
  65         struct btqcomsmd *btq = hci_get_drvdata(hdev);
  66         int ret;
  67
  68         switch (hci_skb_pkt_type(skb)) {
  69         case HCI_ACLDATA_PKT:
  70                 ret = rpmsg_send(btq->acl_channel, skb->data, skb->len);
  71                 if (ret) {
  72                         hdev->stat.err_tx++;
  73                         break;
  74                 }
  75                 hdev->stat.acl_tx++;
  76                 hdev->stat.byte_tx += skb->len;
  77                 break;
  78         case HCI_COMMAND_PKT:
  79                 ret = rpmsg_send(btq->cmd_channel, skb->data, skb->len);
  80                 if (ret) {
  81                         hdev->stat.err_tx++;
  82                         break;
  83                 }
  84                 hdev->stat.cmd_tx++;
  85                 hdev->stat.byte_tx += skb->len;
  86                 break;
  87         default:
  88                 ret = -EILSEQ;
  89                 break;
  90         }
  91
  92         if (!ret)
  93                 kfree_skb(skb);
  94
  95         return ret;
  96 }
  97
  98 static int btqcomsmd_open(struct hci_dev *hdev)
  99 {
 100         return 0;
 101 }
 102
 103 static int btqcomsmd_close(struct hci_dev *hdev)
 104 {
 105         return 0;
 106 }
 107
 108 static int btqcomsmd_setup(struct hci_dev *hdev)
 109 {
 110         struct sk_buff *skb;
 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. Retrieve
 118          * it from the firmware node property.
 119          */
 120         set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
 121
 122         return 0;
 123 }
 124
 125 static int btqcomsmd_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
 126 {
 127         int ret;
 128
 129         ret = qca_set_bdaddr_rome(hdev, bdaddr);
 130         if (ret)
 131                 return ret;
 132
 133         /* The firmware stops responding for a while after setting the bdaddr,
 134          * causing timeouts for subsequent commands. Sleep a bit to avoid this.
 135          */
 136         usleep_range(1000, 10000);
 137         return 0;
 138 }
 139
 140 static int btqcomsmd_probe(struct platform_device *pdev)
 141 {
 142         struct btqcomsmd *btq;
 143         struct hci_dev *hdev;
 144         void *wcnss;
 145         int ret;
 146
 147         btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL);
 148         if (!btq)
 149                 return -ENOMEM;
 150
 151         wcnss = dev_get_drvdata(pdev->dev.parent);
 152
 153         btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL",
 154                                                    btqcomsmd_acl_callback, btq);
 155         if (IS_ERR(btq->acl_channel))
 156                 return PTR_ERR(btq->acl_channel);
 157
 158         btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD",
 159                                                    btqcomsmd_cmd_callback, btq);
 160         if (IS_ERR(btq->cmd_channel)) {
 161                 ret = PTR_ERR(btq->cmd_channel);
 162                 goto destroy_acl_channel;
 163         }
 164
 165         hdev = hci_alloc_dev();
 166         if (!hdev) {
 167                 ret = -ENOMEM;
 168                 goto destroy_cmd_channel;
 169         }
 170
 171         hci_set_drvdata(hdev, btq);
 172         btq->hdev = hdev;
 173         SET_HCIDEV_DEV(hdev, &pdev->dev);
 174
 175         hdev->bus = HCI_SMD;
 176         hdev->open = btqcomsmd_open;
 177         hdev->close = btqcomsmd_close;
 178         hdev->send = btqcomsmd_send;
 179         hdev->setup = btqcomsmd_setup;
 180         hdev->set_bdaddr = btqcomsmd_set_bdaddr;
 181
 182         ret = hci_register_dev(hdev);
 183         if (ret < 0)
 184                 goto hci_free_dev;
 185
 186         platform_set_drvdata(pdev, btq);
 187
 188         return 0;
 189
 190 hci_free_dev:
 191         hci_free_dev(hdev);
 192 destroy_cmd_channel:
 193         rpmsg_destroy_ept(btq->cmd_channel);
 194 destroy_acl_channel:
 195         rpmsg_destroy_ept(btq->acl_channel);
 196
 197         return ret;
 198 }
 199
 200 static int btqcomsmd_remove(struct platform_device *pdev)
 201 {
 202         struct btqcomsmd *btq = platform_get_drvdata(pdev);
 203
 204         hci_unregister_dev(btq->hdev);
 205         hci_free_dev(btq->hdev);
 206
 207         rpmsg_destroy_ept(btq->cmd_channel);
 208         rpmsg_destroy_ept(btq->acl_channel);
 209
 210         return 0;
 211 }
 212
 213 static const struct of_device_id btqcomsmd_of_match[] = {
 214         { .compatible = "qcom,wcnss-bt", },
 215         { },
 216 };
 217 MODULE_DEVICE_TABLE(of, btqcomsmd_of_match);
 218
 219 static struct platform_driver btqcomsmd_driver = {
 220         .probe = btqcomsmd_probe,
 221         .remove = btqcomsmd_remove,
 222         .driver  = {
 223                 .name  = "btqcomsmd",
 224                 .of_match_table = btqcomsmd_of_match,
 225         },
 226 };
 227
 228 module_platform_driver(btqcomsmd_driver);
 229
 230 MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
 231 MODULE_DESCRIPTION("Qualcomm SMD HCI driver");
 232 MODULE_LICENSE("GPL v2");