On Wed, Dec 13, 2017 at 7:16 PM, Marcel Holtmann <mar...@holtmann.org> wrote:
> 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.j0...@gmail.com>
>> Signed-off-by: Siva Rebbagondla <siva.rebbagon...@redpinesignals.com>
>> Signed-off-by: Amitkumar Karwar <amit.kar...@redpinesignals.com>
>> ---
>> v5: Addressed review comments from Marcel.
>> Removed reduntant switch case code from rsi_hci_recv_pkt()
>> Changed bt_cb(skb)->pkt_type to hci_skb_pkt_type(skb)
>> Removed reduntant '\n' from BT_ERR and redundant BT_INFO messages
>> Changed u8 *pkt to const u8 *pkt in rsi_hci_recv_pkt()
>> 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 | 188
>> +++++++++++++++++++++++++++++++++++++++++++++
>> include/linux/rsi_header.h | 4 +-
>> 4 files changed, 204 insertions(+), 1 deletion(-)
>> 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-$(CONFIG_BT_RSI) += btrsi.o
>> +
>
> actually I never caught this before. Since this driver is doing the HCI
> portion, for consistency CONFIG_BT_HCIRSI would be better.
>
>> btmrvl-y := btmrvl_main.o
>> btmrvl-$(CONFIG_DEBUG_FS) += btmrvl_debugfs.o
>>
>> diff --git a/drivers/bluetooth/btrsi.c b/drivers/bluetooth/btrsi.c
>> new file mode 100644
>> index 0000000..c9e92cc
>> --- /dev/null
>> +++ b/drivers/bluetooth/btrsi.c
>> @@ -0,0 +1,188 @@
>> +/**
>> + * 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>
>> +
>> +#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 (hci_skb_pkt_type(skb)) {
>> + 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;
>> + }
>> +
>> + 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 = hci_skb_pkt_type(skb);
>> + 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, const u8 *pkt)
>> +{
>> + struct rsi_hci_adapter *h_adapter = priv;
>> + struct hci_dev *hdev = h_adapter->hdev;
>> + struct sk_buff *skb;
>> + int pkt_len = get_unaligned_le16(pkt) & 0x0fff;
>> +
>> + 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;
>> +
>> + hci_skb_pkt_type(skb) = pkt[14];
>> +
>> + 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 err = 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");
>> + 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;
>
> this doesn’t have to be in this patch, but if you support hdev->set_bdaddr,
> hdev->set_diag etc. that would be good to add in a follow up.
>
>> +
>> + err = hci_register_dev(hdev);
>> + if (err < 0) {
>> + BT_ERR("HCI registration failed with errcode %d", err);
>> + hci_free_dev(hdev);
>> + goto err;
>> + }
>> +
>> + return 0;
>> +err:
>> + h_adapter->hdev = NULL;
>> + kfree(h_adapter);
>> + return -EINVAL;
>> +}
>> +
>> +static void rsi_hci_detach(void *priv)
>> +{
>> + struct rsi_hci_adapter *h_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)
>> +{
>> + return 0;
>> +}
>> +
>> +static void rsi_91x_bt_module_exit(void)
>> +{
>> + return;
>> +}
>> +
>> +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”);
>
> Acked-by: Marcel Holtmann <mar...@holtmann.org>
> Reviewed-by: Marcel Holtmann <mar...@holtmann.org>
>
Thanks Marcel.
I will wait for Kalle's review and suggestions.
I will address your minor comments while preparing updated version
based on Kalle's feedback.
Regards,
Amitkumar
