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Date: Tue, 30 Nov 2010 12:59:52 +0530
From: Pavan Savoy <pavan_savoy@...y.com>
To: padovan@...fusion.mobi, marcel@...tmann.org
Cc: linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
Pavan Savoy <pavan_savoy@...com>
Subject: Re: [PATCH v7] Bluetooth: btwilink driver
On Fri, Nov 26, 2010 at 2:50 PM, <pavan_savoy@...com> wrote:
> From: Pavan Savoy <pavan_savoy@...com>
>
Marcel, Gustavo,
Please find some time to comment and also answer some of the
concerns I have below,
Thanks & Regards,
Pavan Savoy.
> comments attended to from v5 and v6,
>
> 1. Inside ti_st_open, I previously only checked for EINPROGRESS & EPERM,
> Now I handle for EINPROGRESS - which is not really an error and
> return during all other error cases.
>
> 2. _write is still a function pointer and not an exported function, I
> need to change the underlying driver's code for this.
> However, previous lkml comments on the underlying driver's code
> suggested it to be kept as a function pointer and not EXPORT.
> Gustavo, Marcel - Please comment on this.
> Is this absolutely required? If so why?
>
> 3. test_and_set_bit of HCI_RUNNING is done at beginning of
> ti_st_open, and did not see issues during firmware download.
> However ideally I would still like to set HCI_RUNNING once the firmware
> download is done, because I don't want to allow a _send_frame during
> firmware download - Marcel, Gustavo - Please comment.
>
> 4. test_and_clear of HCI_RUNNING now done @ beginning of close.
>
> 5. EAGAIN on failure of st_write is to suggest to try and write again.
> I have never this happen - However only if UART goes bad this case may
> occur.
>
> 6. ti_st_tx_complete is very similar to hci_ldisc's tx_complete - in
> fact the code is pretty much borrowed from there.
> Marcel, Gustavo - Please suggest where should it be done? If not here.
>
> 7. comments cleaned-up + hst memory leak fixed when hci_alloc_dev fails.
>
> 8. platform_driver registration inside module_init now is similar to
> other drivers.
>
> 9. Dan Carpenter's comments on leaking hst memory on failed
> hci_register_dev and empty space after quotes in debug statements
> fixed.
>
> Thanks for the comments...
> Sorry, for previously not being very clear on which comments were
> handled and which were not.
>
> -- 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@...com>
> ---
> drivers/bluetooth/Kconfig | 10 ++
> drivers/bluetooth/Makefile | 1 +
> drivers/bluetooth/btwilink.c | 363 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 374 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..71e69f8
> --- /dev/null
> +++ b/drivers/bluetooth/btwilink.c
> @@ -0,0 +1,363 @@
> +/*
> + * 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@...com>
> + * Pavan Savoy <pavan_savoy@...com>
> + *
> + * 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 = {
> + .type = ST_BT,
> + .recv = st_receive,
> + .reg_complete_cb = st_registration_completion_cb,
> +};
> +
> +/* 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;
> +
> + BT_DBG("%s %p", hdev->name, hdev);
> + if (test_and_set_bit(HCI_RUNNING, &hdev->flags)) {
> + BT_ERR("btwilink already opened");
> + return -EBUSY;
> + }
> +
> + /* provide contexts for callbacks from ST */
> + hst = hdev->driver_data;
> + ti_st_proto.priv_data = hst;
> +
> + err = st_register(&ti_st_proto);
> + 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;
> + } else if (err != 0) {
> + clear_bit(HCI_RUNNING, &hdev->flags);
> + BT_ERR("st_register failed %d", err);
> + return err;
> + }
> +
> + /* ti_st_proto.write is filled up by the underlying shared
> + * transport driver upon registration
> + */
> + hst->st_write = ti_st_proto.write;
> + if (!hst->st_write) {
> + BT_ERR("undefined ST write function");
> + clear_bit(HCI_RUNNING, &hdev->flags);
> +
> + /* Undo registration with ST */
> + err = st_unregister(ST_BT);
> + if (err)
> + BT_ERR("st_unregister() failed with error %d", err);
> +
> + hst->st_write = NULL;
> + return err;
> + }
> +
> + return err;
> +}
> +
> +/* Close device */
> +static int ti_st_close(struct hci_dev *hdev)
> +{
> + int err;
> + struct ti_st *hst = hdev->driver_data;
> +
> + if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
> + return 0;
> +
> + /* continue to unregister from transport */
> + err = st_unregister(ST_BT);
> + if (err)
> + BT_ERR("st_unregister() failed with error %d", err);
> +
> + hst->st_write = NULL;
> +
> + return err;
> +}
> +
> +static int ti_st_send_frame(struct sk_buff *skb)
> +{
> + struct hci_dev *hdev;
> + struct ti_st *hst;
> + long len;
> +
> + hdev = (struct hci_dev *)skb->dev;
> +
> + if (!test_bit(HCI_RUNNING, &hdev->flags))
> + return -EBUSY;
> +
> + hst = hdev->driver_data;
> +
> + /* Prepend skb with frame type */
> + memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
> +
> + BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type,
> + skb->len);
> +
> + /* Insert skb to shared transport layer's transmit queue.
> + * Freeing skb memory is taken care in shared transport layer,
> + * so don't free skb memory here.
> + */
> + len = hst->st_write(skb);
> + if (len < 0) {
> + kfree_skb(skb);
> + BT_ERR("ST write failed (%ld)", len);
> + /* Try Again, would only fail if UART has gone bad */
> + return -EAGAIN;
> + }
> +
> + /* ST accepted our skb. So, Go ahead and do rest */
> + hdev->stat.byte_tx += len;
> + ti_st_tx_complete(hst, bt_cb(skb)->pkt_type);
> +
> + return 0;
> +}
> +
> +static void ti_st_destruct(struct hci_dev *hdev)
> +{
> + BT_DBG("%s", hdev->name);
> + kfree(hdev->driver_data);
> +}
> +
> +static int bt_ti_probe(struct platform_device *pdev)
> +{
> + static struct ti_st *hst;
> + struct hci_dev *hdev;
> + int err;
> +
> + hst = kzalloc(sizeof(struct ti_st), GFP_KERNEL);
> + if (!hst)
> + return -ENOMEM;
> +
> + /* Expose "hciX" device to user space */
> + hdev = hci_alloc_dev();
> + if (!hdev) {
> + kfree(hst);
> + return -ENOMEM;
> + }
> +
> + BT_DBG("hdev %p", hdev);
> +
> + hst->hdev = hdev;
> + hdev->bus = HCI_UART;
> + hdev->driver_data = hst;
> + hdev->open = ti_st_open;
> + hdev->close = ti_st_close;
> + hdev->flush = NULL;
> + hdev->send = ti_st_send_frame;
> + hdev->destruct = ti_st_destruct;
> + hdev->owner = THIS_MODULE;
> +
> + err = hci_register_dev(hdev);
> + if (err < 0) {
> + BT_ERR("Can't register HCI device error %d", err);
> + kfree(hst);
> + hci_free_dev(hdev);
> + return err;
> + }
> +
> + BT_DBG("HCI device registered (hdev %p)", hdev);
> +
> + dev_set_drvdata(&pdev->dev, hst);
> + return err;
> +}
> +
> +static int bt_ti_remove(struct platform_device *pdev)
> +{
> + struct hci_dev *hdev;
> + struct ti_st *hst = dev_get_drvdata(&pdev->dev);
> +
> + if (!hst)
> + return -EFAULT;
> +
> + hdev = hst->hdev;
> + ti_st_close(hdev);
> + hci_unregister_dev(hdev);
> +
> + hci_free_dev(hdev);
> + kfree(hst);
> +
> + dev_set_drvdata(&pdev->dev, NULL);
> + return 0;
> +}
> +
> +static struct platform_driver btwilink_driver = {
> + .probe = bt_ti_probe,
> + .remove = bt_ti_remove,
> + .driver = {
> + .name = "btwilink",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +/* ------- Module Init/Exit interfaces ------ */
> +static int __init btwilink_init(void)
> +{
> + BT_INFO("Bluetooth Driver for TI WiLink - Version %s", VERSION);
> +
> + return platform_driver_register(&btwilink_driver);
> +}
> +
> +static void __exit btwilink_exit(void)
> +{
> + platform_driver_unregister(&btwilink_driver);
> +}
> +
> +module_init(btwilink_init);
> +module_exit(btwilink_exit);
> +
> +/* ------ Module Info ------ */
> +
> +MODULE_AUTHOR("Raja Mani <raja_mani@...com>");
> +MODULE_DESCRIPTION("Bluetooth Driver for TI Shared Transport" VERSION);
> +MODULE_VERSION(VERSION);
> +MODULE_LICENSE("GPL");
> --
> 1.5.6.3
>
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