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/soc/qcom/wcnss_ctrl.h>
  19 #include <linux/platform_device.h>
  20
  21 #include <net/bluetooth/bluetooth.h>
  22 #include <net/bluetooth/hci_core.h>
  23
  24 #include "btqca.h"
  25
  26 struct btqcomsmd {
  27         struct hci_dev *hdev;
  28
  29         bdaddr_t bdaddr;
  30         struct rpmsg_endpoint *acl_channel;
  31         struct rpmsg_endpoint *cmd_channel;
  32 };
  33
  34 static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type,
  35                            const void *data, size_t count)
  36 {
  37         struct sk_buff *skb;
  38
  39         /* Use GFP_ATOMIC as we're in IRQ context */
  40         skb = bt_skb_alloc(count, GFP_ATOMIC);
  41         if (!skb) {
  42                 hdev->stat.err_rx++;
  43                 return -ENOMEM;
  44         }
  45
  46         hci_skb_pkt_type(skb) = type;
  47         skb_put_data(skb, data, count);
  48
  49         return hci_recv_frame(hdev, skb);
  50 }
  51
  52 static int btqcomsmd_acl_callback(struct rpmsg_device *rpdev, void *data,
  53                                   int count, void *priv, u32 addr)
  54 {
  55         struct btqcomsmd *btq = priv;
  56
  57         btq->hdev->stat.byte_rx += count;
  58         return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count);
  59 }
  60
  61 static int btqcomsmd_cmd_callback(struct rpmsg_device *rpdev, void *data,
  62                                   int count, void *priv, u32 addr)
  63 {
  64         struct btqcomsmd *btq = priv;
  65
  66         return btqcomsmd_recv(btq->hdev, HCI_EVENT_PKT, data, count);
  67 }
  68
  69 static int btqcomsmd_send(struct hci_dev *hdev, struct sk_buff *skb)
  70 {
  71         struct btqcomsmd *btq = hci_get_drvdata(hdev);
  72         int ret;
  73
  74         switch (hci_skb_pkt_type(skb)) {
  75         case HCI_ACLDATA_PKT:
  76                 ret = rpmsg_send(btq->acl_channel, skb->data, skb->len);
  77                 hdev->stat.acl_tx++;
  78                 hdev->stat.byte_tx += skb->len;
  79                 break;
  80         case HCI_COMMAND_PKT:
  81                 ret = rpmsg_send(btq->cmd_channel, skb->data, skb->len);
  82                 hdev->stat.cmd_tx++;
  83                 break;
  84         default:
  85                 ret = -EILSEQ;
  86                 break;
  87         }
  88
  89         if (!ret)
  90                 kfree_skb(skb);
  91
  92         return ret;
  93 }
  94
  95 static int btqcomsmd_open(struct hci_dev *hdev)
  96 {
  97         return 0;
  98 }
  99
 100 static int btqcomsmd_close(struct hci_dev *hdev)
 101 {
 102         return 0;
 103 }
 104
 105 static int btqcomsmd_setup(struct hci_dev *hdev)
 106 {
 107         struct btqcomsmd *btq = hci_get_drvdata(hdev);
 108         struct sk_buff *skb;
 109         int err;
 110
 111         skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
 112         if (IS_ERR(skb))
 113                 return PTR_ERR(skb);
 114         kfree_skb(skb);
 115
 116         /* Devices do not have persistent storage for BD address. If no
 117          * BD address has been retrieved during probe, mark the device
 118          * as having an invalid BD address.
 119          */
 120         if (!bacmp(&btq->bdaddr, BDADDR_ANY)) {
 121                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
 122                 return 0;
 123         }
 124
 125         /* When setting a configured BD address fails, mark the device
 126          * as having an invalid BD address.
 127          */
 128         err = qca_set_bdaddr_rome(hdev, &btq->bdaddr);
 129         if (err) {
 130                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
 131                 return 0;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int btqcomsmd_probe(struct platform_device *pdev)
 138 {
 139         struct btqcomsmd *btq;
 140         struct hci_dev *hdev;
 141         void *wcnss;
 142         int ret;
 143
 144         btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL);
 145         if (!btq)
 146                 return -ENOMEM;
 147
 148         wcnss = dev_get_drvdata(pdev->dev.parent);
 149
 150         btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL",
 151                                                    btqcomsmd_acl_callback, btq);
 152         if (IS_ERR(btq->acl_channel))
 153                 return PTR_ERR(btq->acl_channel);
 154
 155         btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD",
 156                                                    btqcomsmd_cmd_callback, btq);
 157         if (IS_ERR(btq->cmd_channel)) {
 158                 ret = PTR_ERR(btq->cmd_channel);
 159                 goto destroy_acl_channel;
 160         }
 161
 162         hdev = hci_alloc_dev();
 163         if (!hdev) {
 164                 ret = -ENOMEM;
 165                 goto destroy_cmd_channel;
 166         }
 167
 168         hci_set_drvdata(hdev, btq);
 169         btq->hdev = hdev;
 170         SET_HCIDEV_DEV(hdev, &pdev->dev);
 171
 172         hdev->bus = HCI_SMD;
 173         hdev->open = btqcomsmd_open;
 174         hdev->close = btqcomsmd_close;
 175         hdev->send = btqcomsmd_send;
 176         hdev->setup = btqcomsmd_setup;
 177         hdev->set_bdaddr = qca_set_bdaddr_rome;
 178
 179         ret = hci_register_dev(hdev);
 180         if (ret < 0)
 181                 goto hci_free_dev;
 182
 183         platform_set_drvdata(pdev, btq);
 184
 185         return 0;
 186
 187 hci_free_dev:
 188         hci_free_dev(hdev);
 189 destroy_cmd_channel:
 190         rpmsg_destroy_ept(btq->cmd_channel);
 191 destroy_acl_channel:
 192         rpmsg_destroy_ept(btq->acl_channel);
 193
 194         return ret;
 195 }
 196
 197 static int btqcomsmd_remove(struct platform_device *pdev)
 198 {
 199         struct btqcomsmd *btq = platform_get_drvdata(pdev);
 200
 201         hci_unregister_dev(btq->hdev);
 202         hci_free_dev(btq->hdev);
 203
 204         rpmsg_destroy_ept(btq->cmd_channel);
 205         rpmsg_destroy_ept(btq->acl_channel);
 206
 207         return 0;
 208 }
 209
 210 static const struct of_device_id btqcomsmd_of_match[] = {
 211         { .compatible = "qcom,wcnss-bt", },
 212         { },
 213 };
 214 MODULE_DEVICE_TABLE(of, btqcomsmd_of_match);
 215
 216 static struct platform_driver btqcomsmd_driver = {
 217         .probe = btqcomsmd_probe,
 218         .remove = btqcomsmd_remove,
 219         .driver  = {
 220                 .name  = "btqcomsmd",
 221                 .of_match_table = btqcomsmd_of_match,
 222         },
 223 };
 224
 225 module_platform_driver(btqcomsmd_driver);
 226
 227 MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
 228 MODULE_DESCRIPTION("Qualcomm SMD HCI driver");
 229 MODULE_LICENSE("GPL v2");