Hi Pavan,
* pavan_savoy@xxxxxx <pavan_savoy@xxxxxx> [2011-01-04 04:59:48 -0600]:
> From: Pavan Savoy <pavan_savoy@xxxxxx>
>
> -- patch description --
>
> This is the bluetooth protocol driver for the TI WiLink7 chipsets.
> Texas Instrument's WiLink chipsets combine wireless technologies
> like BT, FM, GPS and WLAN onto a single chip.
>
> This Bluetooth driver works on top of the TI_ST shared transport
> line discipline driver which also allows other drivers like
> FM V4L2 and GPS character driver to make use of the same UART interface.
>
> Kconfig and Makefile modifications to enable the Bluetooth
> driver for Texas Instrument's WiLink 7 chipset.
>
> Signed-off-by: Pavan Savoy <pavan_savoy@xxxxxx>
> ---
> drivers/bluetooth/Kconfig | 10 +
> drivers/bluetooth/Makefile | 1 +
> drivers/bluetooth/btwilink.c | 397 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 408 insertions(+), 0 deletions(-)
> create mode 100644 drivers/bluetooth/btwilink.c
>
> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
> index 02deef4..8e0de9a 100644
> --- a/drivers/bluetooth/Kconfig
> +++ b/drivers/bluetooth/Kconfig
> @@ -219,4 +219,14 @@ config BT_ATH3K
> Say Y here to compile support for "Atheros firmware download driver"
> into the kernel or say M to compile it as module (ath3k).
>
> +config BT_WILINK
> + tristate "Texas Instruments WiLink7 driver"
> + depends on TI_ST
> + help
> + This enables the Bluetooth driver for Texas Instrument's BT/FM/GPS
> + combo devices. This makes use of shared transport line discipline
> + core driver to communicate with the BT core of the combo chip.
> +
> + Say Y here to compile support for Texas Instrument's WiLink7 driver
> + into the kernel or say M to compile it as module.
> endmenu
> diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
> index 71bdf13..f4460f4 100644
> --- a/drivers/bluetooth/Makefile
> +++ b/drivers/bluetooth/Makefile
> @@ -18,6 +18,7 @@ obj-$(CONFIG_BT_HCIBTSDIO) += btsdio.o
> obj-$(CONFIG_BT_ATH3K) += ath3k.o
> obj-$(CONFIG_BT_MRVL) += btmrvl.o
> obj-$(CONFIG_BT_MRVL_SDIO) += btmrvl_sdio.o
> +obj-$(CONFIG_BT_WILINK) += btwilink.o
>
> btmrvl-y := btmrvl_main.o
> btmrvl-$(CONFIG_DEBUG_FS) += btmrvl_debugfs.o
> diff --git a/drivers/bluetooth/btwilink.c b/drivers/bluetooth/btwilink.c
> new file mode 100644
> index 0000000..0201aca
> --- /dev/null
> +++ b/drivers/bluetooth/btwilink.c
> @@ -0,0 +1,397 @@
> +/*
> + * Texas Instrument's Bluetooth Driver For Shared Transport.
> + *
> + * Bluetooth Driver acts as interface between HCI core and
> + * TI Shared Transport Layer.
> + *
> + * Copyright (C) 2009-2010 Texas Instruments
> + * Author: Raja Mani <raja_mani@xxxxxx>
> + * Pavan Savoy <pavan_savoy@xxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + *
> + */
> +
> +#include <linux/platform_device.h>
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +
> +#include <linux/ti_wilink_st.h>
> +
> +/* Bluetooth Driver Version */
> +#define VERSION "1.0"
> +
> +/* Number of seconds to wait for registration completion
> + * when ST returns PENDING status.
> + */
> +#define BT_REGISTER_TIMEOUT 6000 /* 6 sec */
> +
> +/**
> + * struct ti_st - driver operation structure
> + * @hdev: hci device pointer which binds to bt driver
> + * @reg_status: ST registration callback status
> + * @st_write: write function provided by the ST driver
> + * to be used by the driver during send_frame.
> + * @wait_reg_completion - completion sync between ti_st_open
> + * and ti_st_registration_completion_cb.
> + */
> +struct ti_st {
> + struct hci_dev *hdev;
> + char reg_status;
> + long (*st_write) (struct sk_buff *);
> + struct completion wait_reg_completion;
> +};
> +
> +/* Increments HCI counters based on pocket ID (cmd,acl,sco) */
> +static inline void ti_st_tx_complete(struct ti_st *hst, int pkt_type)
> +{
> + struct hci_dev *hdev = hst->hdev;
> +
> + /* Update HCI stat counters */
> + switch (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;
> + }
> +}
> +
> +/* ------- Interfaces to Shared Transport ------ */
> +
> +/* Called by ST layer to indicate protocol registration completion
> + * status.ti_st_open() function will wait for signal from this
> + * API when st_register() function returns ST_PENDING.
> + */
> +static void st_registration_completion_cb(void *priv_data, char data)
> +{
> + struct ti_st *lhst = priv_data;
> +
> + /* Save registration status for use in ti_st_open() */
> + lhst->reg_status = data;
> + /* complete the wait in ti_st_open() */
> + complete(&lhst->wait_reg_completion);
> +}
> +
> +/* Called by Shared Transport layer when receive data is
> + * available */
> +static long st_receive(void *priv_data, struct sk_buff *skb)
> +{
> + struct ti_st *lhst = priv_data;
> + int err;
> +
> + if (!skb)
> + return -EFAULT;
> +
> + if (!lhst) {
> + kfree_skb(skb);
> + return -EFAULT;
> + }
> +
> + skb->dev = (void *) lhst->hdev;
> +
> + /* Forward skb to HCI core layer */
> + err = hci_recv_frame(skb);
> + if (err < 0) {
> + BT_ERR("Unable to push skb to HCI core(%d)", err);
> + return err;
> + }
> +
> + lhst->hdev->stat.byte_rx += skb->len;
> +
> + return 0;
> +}
> +
> +/* ------- Interfaces to HCI layer ------ */
> +/* protocol structure registered with shared transport */
> +static struct st_proto_s ti_st_proto[3] = {
> + {
> + .chnl_id = 0x02, /* ACL */
Please create macros for the chnl_id in the core driver.
> + .recv = st_receive,
> + .reg_complete_cb = st_registration_completion_cb,
> + .hdr_len = 4,
> + .offset_len_in_hdr = 2,
> + .len_size = 2,
> + .reserve = 8,
> + },
> + {
> + .chnl_id = 0x03, /* SCO */
> + .recv = st_receive,
> + .reg_complete_cb = st_registration_completion_cb,
> + .hdr_len = 3,
> + .offset_len_in_hdr = 2,
> + .len_size = 1,
> + .reserve = 8,
> + },
> + {
> + .chnl_id = 0x04, /* HCI Events */
> + .recv = st_receive,
> + .reg_complete_cb = st_registration_completion_cb,
> + .hdr_len = 2,
> + .offset_len_in_hdr = 1,
> + .len_size = 1,
> + .reserve = 8,
> + },
> +};
> +
> +/* Called from HCI core to initialize the device */
> +static int ti_st_open(struct hci_dev *hdev)
> +{
> + unsigned long timeleft;
> + struct ti_st *hst;
> + int err, i;
> +
> + BT_DBG("%s %p", hdev->name, hdev);
Blank line here.
> + if (test_and_set_bit(HCI_RUNNING, &hdev->flags)) {
> + BT_ERR("btwilink already opened");
No need for this BT_ERR. It already returns -EBUSY.
> + return -EBUSY;
> + }
> +
> + /* provide contexts for callbacks from ST */
> + hst = hdev->driver_data;
> +
> + for (i = 0; i < 3; i++) {
> + ti_st_proto[i].priv_data = hst;
> + ti_st_proto[i].max_frame_size = HCI_MAX_FRAME_SIZE;
> +
> + err = st_register(&ti_st_proto[i]);
Let's change the order here. First
if (!err)
goto to "hst->st_write = ti_st_proto[i].write"
if (err != -EINPROGRESS) {
}
then here code for err == -EINPROGRESS
> + if (err == -EINPROGRESS) {
> + /* ST is busy with either protocol
> + * registration or firmware download.
> + */
> + /* Prepare wait-for-completion handler data structures.
> + */
> + init_completion(&hst->wait_reg_completion);
> +
> + /* Reset ST registration callback status flag,
> + * this value will be updated in
> + * ti_st_registration_completion_cb()
> + * function whenever it called from ST driver.
> + */
> + hst->reg_status = -EINPROGRESS;
> +
> + BT_DBG("waiting for registration "
> + "completion signal from ST");
> + timeleft = wait_for_completion_timeout
> + (&hst->wait_reg_completion,
> + msecs_to_jiffies(BT_REGISTER_TIMEOUT));
> + if (!timeleft) {
> + clear_bit(HCI_RUNNING, &hdev->flags);
> + BT_ERR("Timeout(%d sec),didn't get reg "
> + "completion signal from ST",
> + BT_REGISTER_TIMEOUT / 1000);
> + return -ETIMEDOUT;
> + }
> +
> + /* Is ST registration callback
> + * called with ERROR status? */
> + if (hst->reg_status != 0) {
> + clear_bit(HCI_RUNNING, &hdev->flags);
> + BT_ERR("ST registration completed with invalid "
> + "status %d", hst->reg_status);
> + return -EAGAIN;
> + }
> + err = 0;
remove this err = 0; and return 0 in the end of the function.
> + } else if (err != 0) {
> + clear_bit(HCI_RUNNING, &hdev->flags);
> + BT_ERR("st_register failed %d", err);
> + return err;
> + }
Blank line here.
> + hst->st_write = ti_st_proto[i].write;
> + if (!hst->st_write) {
> + BT_ERR("undefined ST write function");
> + clear_bit(HCI_RUNNING, &hdev->flags);
> +
> + /* Undo registration with ST */
> + err = st_unregister(&ti_st_proto[i]);
> + if (err)
> + BT_ERR("st_unregister() failed with "
> + "error %d", err);
You are unregistering only one protocol here, if the fail happens in the third
one you will leak two of them.
> +
> + hst->st_write = NULL;
> + /* ti_st_proto.write is filled up by the
> + * underlying shared transport driver
> + * upon registration
> + */
> + return err;
> + }
> + }
> +
> + return err;
> +}
> +
> +/* Close device */
> +static int ti_st_close(struct hci_dev *hdev)
> +{
> + int err, i;
> + struct ti_st *hst = hdev->driver_data;
> +
> + if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
> + return 0;
> +
> + for (i = 0; i < 3; i++) {
> + /* continue to unregister from transport */
This comment is pointless.
> + err = st_unregister(&ti_st_proto[i]);
> + if (err)
> + BT_ERR("st_unregister() failed with error %d", err);
> + }
> +
> + hst->st_write = NULL;
> +
> + return err;
err is will report the error if it happens in the first or second unregister.
--
Gustavo F. Padovan
http://profusion.mobi
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