Hi Amitkumar,
> Redpine bluetooth driver is a thin driver which depends on
> 'rsi_91x' driver for transmitting and receiving packets
> to/from device. It creates hci interface when attach() is
> called from 'rsi_91x' module.
>
> Signed-off-by: Prameela Rani Garnepudi <prameela.j04cs@xxxxxxxxx>
> Signed-off-by: Siva Rebbagondla <siva.rebbagondla@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Amitkumar Karwar <amit.karwar@xxxxxxxxxxxxxxxxxx>
> ---
> v4: Removed rsi_hci.h file. Made the functions static(Marcel)
> v3: Made BT_RSI module by default off(Marcel)
> Removed redundant exported function rsi_get_hci_ops()(Marcel)
> v2: Addressed review comments from Marcel
> Removed unnecessary 'depends on BT && BT_RFOMM' line in Kconfig
> Removed redundant BT_INFO messages
> h_adapter initialization and declaration in a single line.
> Removed unnecessary error checks for HCI_RUNNING and fsm_state
> Allocated new skb with skb_realloc_headroom() API if headroom is not sufficient
> Used get_unaligned_le16 helpers
> Moved a structure and union from header file to btrsi.c file
> ---
> drivers/bluetooth/Kconfig | 11 +++
> drivers/bluetooth/Makefile | 2 +
> drivers/bluetooth/btrsi.c | 224 +++++++++++++++++++++++++++++++++++++++++++++
> include/linux/rsi_header.h | 2 +
> 4 files changed, 239 insertions(+)
> create mode 100644 drivers/bluetooth/btrsi.c
>
> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
> index 60e1c7d..33d7514 100644
> --- a/drivers/bluetooth/Kconfig
> +++ b/drivers/bluetooth/Kconfig
> @@ -378,4 +378,15 @@ config BT_QCOMSMD
> Say Y here to compile support for HCI over Qualcomm SMD into the
> kernel or say M to compile as a module.
>
> +config BT_RSI
> + tristate "Redpine HCI support"
> + default n
> + help
> + Redpine BT driver.
> + This driver handles BT traffic from upper layers and pass
> + to the RSI_91x coex module for further scheduling to device
> +
> + Say Y here to compile support for HCI over Redpine into the
> + kernel or say M to compile as a module.
> +
> endmenu
> diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
> index 4e4e44d..712af83a 100644
> --- a/drivers/bluetooth/Makefile
> +++ b/drivers/bluetooth/Makefile
> @@ -28,6 +28,8 @@ obj-$(CONFIG_BT_QCA) += btqca.o
>
> obj-$(CONFIG_BT_HCIUART_NOKIA) += hci_nokia.o
>
> +obj-$(CONFIG_BT_RSI) += btrsi.o
> +
> btmrvl-y := btmrvl_main.o
> btmrvl-$(CONFIG_DEBUG_FS) += btmrvl_debugfs.o
>
> diff --git a/drivers/bluetooth/btrsi.c b/drivers/bluetooth/btrsi.c
> new file mode 100644
> index 0000000..f76ae4d
> --- /dev/null
> +++ b/drivers/bluetooth/btrsi.c
> @@ -0,0 +1,224 @@
> +/**
> + * Copyright (c) 2017 Redpine Signals Inc.
> + *
> + * Permission to use, copy, modify, and/or distribute this software for any
> + * purpose with or without fee is hereby granted, provided that the above
> + * copyright notice and this permission notice appear in all copies.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
> + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
> + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
> + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
> + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> + */
> +#include <linux/version.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +#include <linux/unaligned/le_byteshift.h>
> +#include <linux/rsi_header.h>
> +#include <net/genetlink.h>
> +
> +/* RX frame types */
> +#define RSI_RESULT_CONFIRM 0x80
> +#define RSI_BT_PER 0x10
> +#define RSI_BT_BER 0x11
> +#define RSI_BT_CW 0x12
> +
> +#define RSI_HEADROOM_FOR_BT_HAL 16
> +#define RSI_FRAME_DESC_SIZE 16
> +
> +static struct rsi_hci_adapter {
> + void *priv;
> + struct rsi_proto_ops *proto_ops;
> + struct hci_dev *hdev;
> +};
> +
> +static int rsi_hci_open(struct hci_dev *hdev)
> +{
> + return 0;
> +}
> +
> +static int rsi_hci_close(struct hci_dev *hdev)
> +{
> + return 0;
> +}
> +
> +static int rsi_hci_flush(struct hci_dev *hdev)
> +{
> + return 0;
> +}
> +
> +static int rsi_hci_send_pkt(struct hci_dev *hdev, struct sk_buff *skb)
> +{
> + struct rsi_hci_adapter *h_adapter = hci_get_drvdata(hdev);
> + struct sk_buff *new_skb = NULL;
> +
> + switch (bt_cb(skb)->pkt_type) {
> + case HCI_COMMAND_PKT:
> + hdev->stat.cmd_tx++;
> + break;
> +
> + case HCI_ACLDATA_PKT:
> + hdev->stat.acl_tx++;
> + break;
> +
> + case HCI_SCODATA_PKT:
> + hdev->stat.sco_tx++;
> + break;
> + }
Scrab these empty lines before the break. No need to bloat this up.
> +
> + if (skb_headroom(skb) < RSI_HEADROOM_FOR_BT_HAL) {
> + /* Insufficient skb headroom - allocate a new skb */
> + new_skb = skb_realloc_headroom(skb, RSI_HEADROOM_FOR_BT_HAL);
> + if (unlikely(!new_skb))
> + return -ENOMEM;
> + bt_cb(new_skb)->pkt_type = bt_cb(skb)->pkt_type;
> + kfree_skb(skb);
> + skb = new_skb;
> + }
> +
> + return h_adapter->proto_ops->coex_send_pkt(h_adapter->priv, skb,
> + RSI_BT_Q);
> +}
> +
> +static int rsi_hci_recv_pkt(void *priv, u8 *pkt)
Why is it not const u8 *pkt?
> +{
> + struct rsi_hci_adapter *h_adapter = (struct rsi_hci_adapter *)priv;
The cast here is not needed since *priv is a void pointer.
> + struct hci_dev *hdev = h_adapter->hdev;
> + struct sk_buff *skb;
> +
> + int pkt_len = get_unaligned_le16(pkt) & 0x0fff;
> + u8 queue_no = (get_unaligned_le16(pkt) & 0x7000) >> 12;
Why you are not doing get_unaligned_le16 once?
> +
> + if (queue_no == RSI_BT_MGMT_Q) {
> + u8 msg_type = pkt[14] & 0xFF;
> +
> + switch (msg_type) {
> + case RSI_RESULT_CONFIRM:
> + bt_dev_info(hdev, "BT Result Confirm");
> + return 0;
> + case RSI_BT_BER:
> + bt_dev_info(hdev, "BT Ber");
> + return 0;
> + case RSI_BT_CW:
> + bt_dev_info(hdev, "BT CW");
> + return 0;
> + default:
> + break;
> + }
> + }
Aren’t these above debug messages? How often
> +
> + skb = dev_alloc_skb(pkt_len);
> + if (!skb)
> + return -ENOMEM;
> +
> + memcpy(skb->data, pkt + RSI_FRAME_DESC_SIZE, pkt_len);
> + skb_put(skb, pkt_len);
> + h_adapter->hdev->stat.byte_rx += skb->len;
> +
> + skb->dev = (void *)hdev;
That above is no longer needed.
> + bt_cb(skb)->pkt_type = pkt[14];
Please hci_skb_pkt_type here.
> +
> + return hci_recv_frame(hdev, skb);
> +}
> +
> +static int rsi_hci_attach(void *priv, struct rsi_proto_ops *ops)
> +{
> + struct rsi_hci_adapter *h_adapter = NULL;
> + struct hci_dev *hdev;
> + int status = 0;
> +
> + h_adapter = kzalloc(sizeof(*h_adapter), GFP_KERNEL);
> + if (!h_adapter)
> + return -ENOMEM;
> +
> + h_adapter->priv = priv;
> + ops->set_bt_context(priv, h_adapter);
> + h_adapter->proto_ops = ops;
> +
> + hdev = hci_alloc_dev();
> + if (!hdev) {
> + BT_ERR("Failed to alloc HCI device\n”);
No \n at the end for the BT_ and bt_ ones.
> + goto err;
> + }
> +
> + h_adapter->hdev = hdev;
> +
> + if (ops->get_host_intf(priv) == RSI_HOST_INTF_SDIO)
> + hdev->bus = HCI_SDIO;
> + else
> + hdev->bus = HCI_USB;
> +
> + hci_set_drvdata(hdev, h_adapter);
> + hdev->dev_type = HCI_PRIMARY;
> + hdev->open = rsi_hci_open;
> + hdev->close = rsi_hci_close;
> + hdev->flush = rsi_hci_flush;
> + hdev->send = rsi_hci_send_pkt;
> +
> + status = hci_register_dev(hdev);
> + if (status < 0) {
> + BT_ERR("%s: HCI registration failed with errcode %d\n",
> + __func__, status);
The __func__ part is pointless here. And I would use err instead of status as variable.
> + goto err;
> + }
> +
> + return 0;
> +err:
> + if (hdev) {
> + hci_unregister_dev(hdev);
That is wrong here. Nothing is registered.
> + hci_free_dev(hdev);
> + h_adapter->hdev = NULL;
> + }
And I would use two error labels or just do it right in the error cases. It is actually simpler in the error cases since it is cleaner.
> + kfree(h_adapter);
> +
> + return -EINVAL;
> +}
> +
> +static void rsi_hci_detach(void *priv)
> +{
> + struct rsi_hci_adapter *h_adapter = (struct rsi_hci_adapter *)priv;
> + struct hci_dev *hdev;
> +
> + if (!h_adapter)
> + return;
> +
> + hdev = h_adapter->hdev;
> + if (hdev) {
> + hci_unregister_dev(hdev);
> + hci_free_dev(hdev);
> + h_adapter->hdev = NULL;
> + }
> +
> + kfree(h_adapter);
> +}
> +
> +const struct rsi_mod_ops rsi_bt_ops = {
> + .attach = rsi_hci_attach,
> + .detach = rsi_hci_detach,
> + .recv_pkt = rsi_hci_recv_pkt,
> +};
> +EXPORT_SYMBOL(rsi_bt_ops);
> +
> +static int rsi_91x_bt_module_init(void)
> +{
> + BT_INFO("%s: BT Module init called\n", __func__);
Scarp this BT_INFO, both of them are pointless.
> +
> + return 0;
> +}
> +
> +static void rsi_91x_bt_module_exit(void)
> +{
> + BT_INFO("%s: BT Module exit called\n", __func__);
> +}
> +
> +module_init(rsi_91x_bt_module_init);
> +module_exit(rsi_91x_bt_module_exit);
> +MODULE_AUTHOR("Redpine Signals Inc");
> +MODULE_DESCRIPTION("RSI BT driver");
> +MODULE_SUPPORTED_DEVICE("RSI-BT");
> +MODULE_LICENSE("Dual BSD/GPL");
> diff --git a/include/linux/rsi_header.h b/include/linux/rsi_header.h
> index 737ab4e..07d9574 100644
> --- a/include/linux/rsi_header.h
> +++ b/include/linux/rsi_header.h
> @@ -51,4 +51,6 @@ struct rsi_mod_ops {
> void (*detach)(void *priv);
> int (*recv_pkt)(void *priv, u8 *msg);
> };
> +
> +extern const struct rsi_mod_ops rsi_bt_ops;
> #endif
Regards
Marcel
