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Date: Tue, 13 Dec 2022 11:59:14 +0000
From: Neeraj sanjay kale <neeraj.sanjaykale@....com>
To: Luiz Augusto von Dentz <luiz.dentz@...il.com>
CC: "marcel@...tmann.org" <marcel@...tmann.org>,
"johan.hedberg@...il.com" <johan.hedberg@...il.com>,
"pmenzel@...gen.mpg.de" <pmenzel@...gen.mpg.de>,
Amitkumar Karwar <amitkumar.karwar@....com>,
Rohit Fule <rohit.fule@....com>,
Sherry Sun <sherry.sun@....com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] Bluetooth: Add hci_nxp to hci_uart module to
support NXP BT chipsets
Hi Luiz,
Thanks for reviewing my patch. I have addressed the comments in V4 patch.
Please find my response in-line below.
> From: Luiz Augusto von Dentz <luiz.dentz@...il.com>
> Sent: Friday, December 2, 2022 1:49 AM
> To: Neeraj sanjay kale <neeraj.sanjaykale@....com>
> Cc: marcel@...tmann.org; johan.hedberg@...il.com;
> pmenzel@...gen.mpg.de; Amitkumar Karwar
> <amitkumar.karwar@....com>; Rohit Fule <rohit.fule@....com>; Sherry
> Sun <sherry.sun@....com>; linux-kernel@...r.kernel.org; linux-
> bluetooth@...r.kernel.org
> Subject: Re: [PATCH v3 1/2] Bluetooth: Add hci_nxp to hci_uart module
> to support NXP BT chipsets
>
> Hi Neeraj,
>
> On Wed, Nov 23, 2022 at 4:44 AM Neeraj Sanjay Kale
> <neeraj.sanjaykale@....com> wrote:
> >
> > Add hci_nxp to the hci_uart module which adds support for the NXP BT
> > chips. This driver has Power Save feature that will put the NXP
> > bluetooth chip into sleep state, whenever there is no activity for
> > certain duration of time (2000ms), and will be woken up when any
> > activity is to be initiated.
> >
> > The Power Save feature can (optionally) be configured with the
> > following set of commands:
> > hcitool -i hci0 cmd 3F 23 02 00 00 (disable Power Save)
> > hcitool -i hci0 cmd 3F 23 03 00 00 (enable Power Save)
Corrected the comments in above 2 lines.
> > where,
> > OGF = 0x3F (vendor specific command)
> > OCF = 0x23 (command to set Power Save state) arg[0] = 0x02 (disable
> > Power Save) arg[0] = 0x03 (enable Power Save) arg[1,2,...] = XX (don't
> > care)
> >
> > The sleep/wake-up source can be configured with the following set of
> > commands:
> > hcitool -i hci0 cmd 3F 53 03 14 01 FF (set UART break method)
> > hcitool -i hci0 cmd 3F 53 03 14 00 FF (set UART DSR method)
> > where,
> > OGF = 0x3F (vendor specific command)
> > OCF = 0x53 (command to set sleep and wake-up source) arg[0] = 0x00
> > (Chip to host method NONE) arg[0] = 0x01 (Chip to host method UART
> > DTR) arg[0] = 0x02 (Chip to host method UART BREAK) arg[0] = 0x03
> > (Chip to host method GPIO) arg[1] = 0x14 (Chip to host GPIO[20] if
> > arg[0] is 0x03, else 0xFF) arg[2] = 0x00 (Host to chip method UART
> > DSR) arg[2] = 0x01 (Host to chip method UART BREAK) arg[3] = 0xXX
> > (Reserved for future use)
> >
> > By default, the hci_nxp sets power save enable, chip to host wake-up
> > source as GPIO and host to chip sleep and wake-up source as UART break
> > during driver initialization, by sending the respective commands to
> > the chip.
> >
> > Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
> > ---
> > v2: Changed the subject/summary lines and added more details in the
> > description. (Paul Menzel)
> > v3: Made internal functions static, optimized the code, added few
> > comments. (Sherry Sun)
> > ---
> > MAINTAINERS | 6 +
> > drivers/bluetooth/Kconfig | 10 +
> > drivers/bluetooth/Makefile | 1 +
> > drivers/bluetooth/hci_ldisc.c | 6 +
> > drivers/bluetooth/hci_nxp.c | 764
> ++++++++++++++++++++++++++++++++++++++++++
> > drivers/bluetooth/hci_nxp.h | 110 ++++++
> > drivers/bluetooth/hci_uart.h | 8 +-
> > 7 files changed, 904 insertions(+), 1 deletion(-) create mode 100644
> > drivers/bluetooth/hci_nxp.c create mode 100644
> > drivers/bluetooth/hci_nxp.h
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS index e55a4d4..70f802d 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -22591,6 +22591,12 @@ L: linux-mm@...ck.org
> > S: Maintained
> > F: mm/zswap.c
> >
> > +NXP BLUETOOTH WIRELESS DRIVERS
> > +M: Amitkumar Karwar <amitkumar.karwar@....com>
> > +M: Neeraj Kale <neeraj.sanjaykale@....co>m
> > +S: Maintained
> > +F: drivers/bluetooth/hci_nxp*
> > +
> > THE REST
> > M: Linus Torvalds <torvalds@...ux-foundation.org>
> > L: linux-kernel@...r.kernel.org
> > diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
> > index 89b4d47..7f6d1dc 100644
> > --- a/drivers/bluetooth/Kconfig
> > +++ b/drivers/bluetooth/Kconfig
> > @@ -273,6 +273,16 @@ config BT_HCIUART_MRVL
> >
> > Say Y here to compile support for HCI MRVL protocol.
> >
> > +config BT_HCIUART_NXP
> > + bool "NXP protocol support"
> > + depends on BT_HCIUART
> > + help
> > + NXP is serial protocol for communication between Bluetooth
> > + device and host. This protocol is required for most NXP Bluetooth
> > + devices with UART interface.
> > +
> > + Say Y here to compile support for HCI NXP protocol.
> > +
> > config BT_HCIBCM203X
> > tristate "HCI BCM203x USB driver"
> > depends on USB
> > diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
> > index 3321a8a..bc80329 100644
> > --- a/drivers/bluetooth/Makefile
> > +++ b/drivers/bluetooth/Makefile
> > @@ -48,4 +48,5 @@ hci_uart-$(CONFIG_BT_HCIUART_BCM) +=
> hci_bcm.o
> > hci_uart-$(CONFIG_BT_HCIUART_QCA) += hci_qca.o
> > hci_uart-$(CONFIG_BT_HCIUART_AG6XX) += hci_ag6xx.o
> > hci_uart-$(CONFIG_BT_HCIUART_MRVL) += hci_mrvl.o
> > +hci_uart-$(CONFIG_BT_HCIUART_NXP) += hci_nxp.o
> > hci_uart-objs := $(hci_uart-y)
> > diff --git a/drivers/bluetooth/hci_ldisc.c
> > b/drivers/bluetooth/hci_ldisc.c index 865112e..f3c85c2 100644
> > --- a/drivers/bluetooth/hci_ldisc.c
> > +++ b/drivers/bluetooth/hci_ldisc.c
> > @@ -882,6 +882,9 @@ static int __init hci_uart_init(void) #ifdef
> > CONFIG_BT_HCIUART_MRVL
> > mrvl_init();
> > #endif
> > +#ifdef CONFIG_BT_HCIUART_NXP
> > + nxp_init();
> > +#endif
> >
> > return 0;
> > }
> > @@ -918,6 +921,9 @@ static void __exit hci_uart_exit(void) #ifdef
> > CONFIG_BT_HCIUART_MRVL
> > mrvl_deinit();
> > #endif
> > +#ifdef CONFIG_BT_HCIUART_NXP
> > + nxp_deinit();
> > +#endif
> >
> > tty_unregister_ldisc(&hci_uart_ldisc);
> > }
> > diff --git a/drivers/bluetooth/hci_nxp.c b/drivers/bluetooth/hci_nxp.c
> > new file mode 100644 index 0000000..1508edd
> > --- /dev/null
> > +++ b/drivers/bluetooth/hci_nxp.c
> > @@ -0,0 +1,764 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + *
> > + * Bluetooth HCI UART driver
> > + * Copyright 2018-2022 NXP
> > + *
> > + *
> > + * This program is free software; you can redistribute it and/or
> > +modify
> > + * it under the terms of the GNU General Public License as published
> > +by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + *
> > + * 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.
> > + *
> > + */
> > +
> > +#include <linux/module.h>
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/init.h>
> > +#include <linux/types.h>
> > +#include <linux/fcntl.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/ptrace.h>
> > +#include <linux/poll.h>
> > +
> > +#include <linux/slab.h>
> > +#include <linux/tty.h>
> > +#include <linux/errno.h>
> > +#include <linux/string.h>
> > +#include <linux/signal.h>
> > +#include <linux/ioctl.h>
> > +#include <linux/skbuff.h>
> > +#include <asm/unaligned.h>
> > +
> > +#include <net/bluetooth/bluetooth.h>
> > +#include <net/bluetooth/hci_core.h>
> > +
> > +#include "hci_uart.h"
> > +#include "hci_nxp.h"
> > +
> > +/** NXP Power Save Feature **/
> > +struct BT_CMD {
> > + u16 ocf_ogf;
> > + u8 length;
> > + u8 data[4];
> > +} __packed;
> > +
> > +/* Power Save feature will be enabled and wakeup method will be break
> > +signal by default */ int wakeupmode = WAKEUP_METHOD_BREAK; int
> > +ps_mode = PS_MODE_ENABLE;
> > +
> > +static int is_device_ready(struct hci_uart *hu) {
> > + struct hci_dev *hdev = NULL;
> > +
> > + if (!hu) {
> > + BT_ERR("hu is NULL");
> > + return -ENODEV;
> > + }
> > + if (!hu->proto || !hu->hdev || !hu->tty) {
> > + BT_ERR("Device not ready! proto=%p, hdev=%p, tty=%p", hu-
> >proto, hu->hdev, hu->tty);
> > + return -ENODEV;
> > + }
> > + hdev = hu->hdev;
> > + if (!test_bit(HCI_RUNNING, &hdev->flags)) {
> > + BT_ERR("HCI_RUNNING is not set");
> > + return -EBUSY;
> > + }
> > + return 0;
> > +}
> > +
> > +/* Builds and sends a PS command packet to chip */ static int
> > +send_ps_cmd(u8 cmd, struct hci_uart *hu) {
> > + int err = 0;
> > + struct sk_buff *skb = NULL;
> > + struct BT_CMD *pcmd;
>
> Why are you using BT_CMD when we do have the likes hci_send_cmd, or
> __hci_cmd_sync, to encode HCI commands?
I have re-written this function to use __hci_cmd_sync()
>
> > +
> > + /* allocate packet */
> > + skb = bt_skb_alloc(sizeof(struct BT_CMD), GFP_ATOMIC);
> > + if (!skb) {
> > + BT_ERR("cannot allocate memory for HCILL packet");
> > + err = -ENOMEM;
> > + goto out;
> > + }
> > +
> > + pcmd = (struct BT_CMD *)skb->data;
> > + pcmd->ocf_ogf = (OGF << 10) | BT_CMD_AUTO_SLEEP_MODE;
> > + pcmd->length = 1;
> > + if (cmd == PS_MODE_ENABLE)
> > + pcmd->data[0] = BT_PS_ENABLE;
> > + else
> > + pcmd->data[0] = BT_PS_DISABLE;
> > +
> > + bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
> > + skb_put(skb, sizeof(struct BT_CMD) - 4 + pcmd->length);
> > + skb->dev = (void *)hu->hdev;
> > +
> > + /* send packet */
> > + hu->proto->enqueue(hu, skb);
> > + hci_uart_tx_wakeup(hu);
> > +
> > +out:
> > + return err;
> > +}
> > +
> > +/* Builds and sends an wake up method command packet to chip */
> > +static int send_wakeup_method_cmd(u8 cmd, struct hci_uart *hu) {
> > + int err = 0;
> > + struct sk_buff *skb = NULL;
> > + struct BT_CMD *pcmd;
> > +
> > + /* allocate packet */
> > + skb = bt_skb_alloc(sizeof(struct BT_CMD), GFP_ATOMIC);
> > + if (!skb) {
> > + BT_ERR("cannot allocate memory for HCILL packet");
> > + err = -ENOMEM;
> > + goto out;
> > + }
> > +
> > + pcmd = (struct BT_CMD *)skb->data;
> > + pcmd->ocf_ogf = (OGF << 10) | BT_CMD_WAKEUP_METHOD;
> > + pcmd->length = 4;
> > + pcmd->data[0] = BT_HOST_WAKEUP_METHOD_NONE;
> > + pcmd->data[1] = BT_HOST_WAKEUP_DEFAULT_GPIO;
> > + switch (cmd) {
> > + case WAKEUP_METHOD_DTR:
> > + pcmd->data[2] = BT_CTRL_WAKEUP_METHOD_DSR;
> > + break;
> > + case WAKEUP_METHOD_BREAK:
> > + default:
> > + pcmd->data[2] = BT_CTRL_WAKEUP_METHOD_BREAK;
> > + break;
> > + }
> > + pcmd->data[3] = 0xFF;
> > +
> > + bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
> > +
> > + skb_put(skb, sizeof(struct BT_CMD) - 4 + pcmd->length);
> > + skb->dev = (void *)hu->hdev;
> > +
> > + /* send packet */
> > + hu->proto->enqueue(hu, skb);
> > + hci_uart_tx_wakeup(hu);
> > +
> > +out:
> > + return err;
> > +}
> > +
> > +static void ps_start_timer(struct hci_uart *hu) {
> > + struct nxp_struct *nxp = hu->priv;
> > + struct ps_data *psdata = nxp->psdata;
> > +
> > + if (psdata->cur_psmode == PS_MODE_ENABLE) {
> > + psdata->timer_on = 1;
> > + mod_timer(&psdata->ps_timer, jiffies + (psdata->interval * HZ) /
> 1000);
> > + }
> > +}
> > +
> > +static void ps_timeout_func(struct timer_list *t) {
> > + struct ps_data *data = from_timer(data, t, ps_timer);
> > + struct tty_struct *tty = data->tty;
> > + struct hci_uart *hu = NULL;
> > +
> > + data->timer_on = 0;
> > + if (!data->tty)
> > + return;
> > +
> > + hu = (struct hci_uart *)tty->disc_data;
> > + if (!hu)
> > + return;
> > +
> > + if (test_bit(HCI_UART_SENDING, &hu->tx_state)) {
> > + ps_start_timer(hu);
> > + } else {
> > + data->ps_cmd = PS_CMD_ENTER_PS;
> > + schedule_work(&data->work);
> > + }
> > +}
> > +
> > +static void set_dtr(struct tty_struct *tty, int on_off) {
> > + u32 old_state = 0;
> > + u32 new_state = 0;
> > +
> > + if (TTY_FUNC->tiocmget) {
> > + old_state = TTY_FUNC->tiocmget(tty);
> > + if (on_off)
> > + new_state = old_state | TIOCM_DTR;
> > + else
> > + new_state = old_state & ~TIOCM_DTR;
> > + if (new_state == old_state)
> > + return;
> > + if (TTY_FUNC->tiocmset) {
> > + if (on_off)
> > + TTY_FUNC->tiocmset(tty, TIOCM_DTR, 0); /* DTR ON */
> > + else
> > + TTY_FUNC->tiocmset(tty, 0, TIOCM_DTR); /* DTR OFF */
> > + }
> > + }
> > +}
> > +
> > +static void set_break(struct tty_struct *tty, int on_off) {
> > + if (TTY_FUNC->break_ctl) {
> > + if (on_off)
> > + TTY_FUNC->break_ctl(tty, -1); /* turn on break */
> > + else
> > + TTY_FUNC->break_ctl(tty, 0); /* turn off break */
> > + }
> > +}
> > +
> > +static int get_cts(struct tty_struct *tty) {
> > + u32 state = 0;
> > + int ret = -1;
> > +
> > + if (TTY_FUNC->tiocmget) {
> > + state = TTY_FUNC->tiocmget(tty);
> > + if (state & TIOCM_CTS)
> > + ret = 1; /* CTS LOW */
> > + else
> > + ret = 0; /* CTS HIGH */
> > + }
> > + return ret;
> > +}
> > +
> > +static void set_rts(struct tty_struct *tty, int on_off) {
> > + u32 old_state = 0;
> > + u32 new_state = 0;
> > +
> > + if (TTY_FUNC->tiocmget) {
> > + old_state = TTY_FUNC->tiocmget(tty);
> > + if (on_off)
> > + new_state = old_state | TIOCM_RTS;
> > + else
> > + new_state = old_state & ~TIOCM_RTS;
> > + if (new_state == old_state)
> > + return;
> > + if (TTY_FUNC->tiocmset) {
> > + if (on_off)
> > + TTY_FUNC->tiocmset(tty, TIOCM_RTS, 0); /* RTS ON */
> > + else
> > + TTY_FUNC->tiocmset(tty, 0, TIOCM_RTS); /* RTS OFF */
> > + }
> > + }
> > +}
> > +
> > +static void ps_control(struct ps_data *data, u8 ps_state) {
> > + struct hci_uart *hu = NULL;
> > +
> > + if (data->ps_state == ps_state)
> > + return;
> > +
> > + if (data->tty) {
> > + switch (data->cur_wakeupmode) {
> > + case WAKEUP_METHOD_DTR:
> > + if (ps_state == PS_STATE_AWAKE)
> > + set_dtr(data->tty, 1); /* DTR ON */
> > + else
> > + set_dtr(data->tty, 0); /* DTR OFF */
> > + break;
> > + case WAKEUP_METHOD_BREAK:
> > + if (ps_state == PS_STATE_AWAKE)
> > + set_break(data->tty, 0); /* break OFF */
> > + else
> > + set_break(data->tty, 1); /* break ON */
> > + break;
> > + default:
> > + break;
> > + }
> > + data->ps_state = ps_state;
> > +
> > + if (ps_state == PS_STATE_AWAKE) {
> > + hu = (struct hci_uart *)data->tty->disc_data;
> > + if (hu)
> > + hci_uart_tx_wakeup(hu);
> > + }
> > + }
> > +}
> > +
> > +static void ps_work_func(struct work_struct *work) {
> > + struct ps_data *data = container_of(work, struct ps_data,
> > +work);
> > +
> > + if (data->tty) {
> > + if (data->ps_cmd == PS_CMD_ENTER_PS && data->cur_psmode
> == PS_MODE_ENABLE)
> > + ps_control(data, PS_STATE_SLEEP);
> > + else if (data->ps_cmd == PS_CMD_EXIT_PS)
> > + ps_control(data, PS_STATE_AWAKE);
> > + }
> > +}
> > +
> > +static int ps_init_work(struct hci_uart *hu) {
> > + struct ps_data *psdata = kzalloc(sizeof(*psdata), GFP_KERNEL);
> > + struct nxp_struct *nxp = hu->priv;
> > +
> > + if (!psdata) {
> > + BT_ERR("Can't allocate control structure");
> > + return -ENFILE;
> > + }
> > + nxp->psdata = psdata;
> > +
> > + memset(psdata, 0, sizeof(*psdata));
> > + psdata->interval = DEFAULT_TIME_PERIOD;
> > + psdata->timer_on = 0;
> > + psdata->tty = NULL;
> > + psdata->ps_state = PS_STATE_AWAKE;
> > + psdata->ps_mode = ps_mode;
> > + psdata->ps_cmd = 0;
> > + psdata->send_cmd = 0;
> > + switch (wakeupmode) {
> > + case WAKEUP_METHOD_DTR:
> > + psdata->wakeupmode = WAKEUP_METHOD_DTR;
> > + break;
> > + case WAKEUP_METHOD_BREAK:
> > + default:
> > + psdata->wakeupmode = WAKEUP_METHOD_BREAK;
> > + break;
> > + }
> > +
> > + psdata->cur_psmode = PS_MODE_DISABLE;
> > + psdata->cur_wakeupmode = WAKEUP_METHOD_INVALID;
> > +
> > + INIT_WORK(&psdata->work, ps_work_func);
> > + return 0;
> > +}
> > +
> > +static void ps_init_timer(struct hci_uart *hu) {
> > + struct nxp_struct *nxp = hu->priv;
> > + struct ps_data *psdata = nxp->psdata;
> > +
> > + psdata->timer_on = 0;
> > + psdata->tty = hu->tty;
> > + timer_setup(&psdata->ps_timer, ps_timeout_func, 0); }
> > +
> > +static void ps_cancel_timer(struct hci_uart *hu) {
> > + struct nxp_struct *nxp = hu->priv;
> > + struct ps_data *psdata = nxp->psdata;
> > +
> > + if (psdata) {
> > + flush_scheduled_work();
> > + if (psdata->timer_on)
> > + del_timer(&psdata->ps_timer);
> > + if (psdata->cur_psmode == PS_MODE_ENABLE) {
> > + switch (psdata->cur_wakeupmode) {
> > + case WAKEUP_METHOD_BREAK:
> > + set_break(psdata->tty, 0); /* set_break off */
> > + break;
> > + case WAKEUP_METHOD_DTR:
> > + set_dtr(psdata->tty, 1); /* dtr on */
> > + break;
> > + default:
> > + break;
> > + }
> > + }
> > + psdata->tty = NULL;
> > + kfree(psdata);
> > + }
> > +}
> > +
> > +static int ps_wakeup(struct hci_uart *hu) {
> > + struct nxp_struct *nxp = hu->priv;
> > + struct ps_data *psdata = nxp->psdata;
> > + int ret = 1;
> > +
> > + if (psdata->ps_state == PS_STATE_AWAKE)
> > + ret = 0;
> > + psdata->ps_cmd = PS_CMD_EXIT_PS;
> > + schedule_work(&psdata->work);
> > + return ret;
> > +}
> > +
> > +static void ps_init(struct hci_uart *hu) {
> > + struct nxp_struct *nxp = hu->priv;
> > + struct ps_data *psdata = nxp->psdata;
> > + int mode = 0;
> > + struct ktermios old_termios;
> > +
> > + if (!psdata || !psdata->tty)
> > + return;
> > + if (get_cts(psdata->tty) != 1) {
> > + /* CTS is not low, chip is either sleeping */
> > + /* or flow control is not enabled */
> > + old_termios = psdata->tty->termios;
> > + psdata->tty->termios.c_cflag &= ~CRTSCTS; /* Clear the flow
> control */
> > + psdata->TTY_FUNC->set_termios(psdata->tty, &old_termios);
> > + old_termios = psdata->tty->termios;
> > + psdata->tty->termios.c_cflag |= CRTSCTS; /* Enable the flow
> control */
> > + psdata->TTY_FUNC->set_termios(psdata->tty,
> > + &old_termios);
> > +
> > + /* Wake up the chip */
> > + mode = psdata->cur_wakeupmode;
> > + if (mode == WAKEUP_METHOD_INVALID)
> > + mode = wakeupmode;
> > + switch (mode) {
> > + case WAKEUP_METHOD_BREAK:
> > + set_rts(psdata->tty, 1); /* set RTS */
> > + set_break(psdata->tty, 1); /* break on */
> > + set_break(psdata->tty, 0); /* break off */
> > + mdelay(5);
> > + break;
> > + case WAKEUP_METHOD_DTR:
> > + set_rts(psdata->tty, 1); /* set RTS */
> > + set_dtr(psdata->tty, 0); /* dtr off */
> > + set_dtr(psdata->tty, 1); /* dtr on */
> > + mdelay(5);
> > + break;
> > + default:
> > + break;
> > + }
> > + }
> > +
> > + psdata->send_cmd = 0;
> > + if (!is_device_ready(hu)) {
> > + if (psdata->cur_wakeupmode != psdata->wakeupmode) {
> > + psdata->send_cmd |= SEND_WAKEUP_METHOD_CMD;
> > + send_wakeup_method_cmd(psdata->wakeupmode, hu);
> > + }
> > + if (psdata->cur_psmode != psdata->ps_mode) {
> > + psdata->send_cmd |= SEND_AUTO_SLEEP_MODE_CMD;
> > + send_ps_cmd(psdata->ps_mode, hu);
> > + }
> > + }
> > +}
> > +
> > +static void ps_check_event_packet(struct hci_uart *hu, struct sk_buff
> > +*skb) {
> > + struct hci_event_hdr *hdr = (void *)skb->data;
> > + struct hci_ev_cmd_complete *ev = NULL;
> > + u8 event = hdr->evt;
> > + u16 opcode;
> > + u8 status = 0;
> > + struct nxp_struct *nxp = hu->priv;
> > + struct ps_data *psdata = nxp->psdata;
> > +
> > + if (event == HCI_EV_CMD_COMPLETE) {
> > + ev = (void *)(skb->data + sizeof(struct
> > + hci_event_hdr));
>
> Don't access the skb->data like that, you probably want to take a look at
> skb_pull_data which does check the length.
Removed the ps_check_event_packet() function completely. Used skb_pull_data() after __hci_cmd_sync() in send_ps_cmd() and send_wakeup_method_cmd()
>
> > + opcode = __le16_to_cpu(ev->opcode);
> > + switch (opcode) {
> > + case HCI_OP_AUTO_SLEEP_MODE:
> > + status = *((u8 *)ev + sizeof(struct hci_ev_cmd_complete));
> > + if (!status)
> > + psdata->cur_psmode = psdata->ps_mode;
> > + else
> > + psdata->ps_mode = psdata->cur_psmode;
> > + /* if driver has sent the command internally */
> > + if (psdata->send_cmd)
> > + psdata->send_cmd &= ~SEND_AUTO_SLEEP_MODE_CMD;
> > + if (psdata->cur_psmode == PS_MODE_ENABLE)
> > + ps_start_timer(hu);
> > + else
> > + ps_wakeup(hu);
> > + BT_INFO("Power Save mode response: status=%d,
> ps_mode=%d",
> > + status, psdata->cur_psmode);
> > + break;
> > + case HCI_OP_WAKEUP_METHOD:
> > + status = *((u8 *)ev + sizeof(struct hci_ev_cmd_complete));
> > + if (!status)
> > + psdata->cur_wakeupmode = psdata->wakeupmode;
> > + else
> > + psdata->wakeupmode = psdata->cur_wakeupmode;
> > + /* if driver has sent the command internally */
> > + if (psdata->send_cmd)
> > + psdata->send_cmd &= ~SEND_WAKEUP_METHOD_CMD;
> > + BT_INFO("Set Wakeup Method response: status=%d,
> wakeupmode=%d",
> > + status, psdata->cur_wakeupmode);
> > + break;
> > + default:
> > + break;
> > + }
> > + }
> > +}
> > +
> > +/** NXP proto **/
> > +
> > +/* Initialize protocol */
> > +static int nxp_open(struct hci_uart *hu) {
> > + struct nxp_struct *nxp;
> > +
> > + BT_DBG("hu %p", hu);
> > +
> > + nxp = kzalloc(sizeof(*nxp), GFP_KERNEL);
> > + if (!nxp)
> > + return -ENOMEM;
> > +
> > + skb_queue_head_init(&nxp->txq);
> > +
> > + hu->priv = nxp;
> > +
> > + if (ps_init_work(hu) == 0)
> > + ps_init_timer(hu);
> > +
> > + return 0;
> > +}
> > +
> > +/* Flush protocol data */
> > +static int nxp_flush(struct hci_uart *hu) {
> > + struct nxp_struct *nxp = hu->priv;
> > +
> > + BT_DBG("hu %p", hu);
> > +
> > + skb_queue_purge(&nxp->txq);
> > +
> > + return 0;
> > +}
> > +
> > +/* Close protocol */
> > +static int nxp_close(struct hci_uart *hu) {
> > + struct nxp_struct *nxp = hu->priv;
> > +
> > + BT_DBG("hu %p", hu);
> > +
> > + ps_cancel_timer(hu);
> > +
> > + skb_queue_purge(&nxp->txq);
> > +
> > + kfree_skb(nxp->rx_skb);
> > +
> > + hu->priv = NULL;
> > + kfree(nxp);
> > +
> > + return 0;
> > +}
> > +
> > +/* Enqueue frame for transmission (padding, crc, etc) */ static int
> > +nxp_enqueue(struct hci_uart *hu, struct sk_buff *skb) {
> > + struct nxp_struct *nxp = hu->priv;
> > + struct ps_data *psdata = nxp->psdata;
> > + struct BT_CMD *pcmd = (struct BT_CMD *)skb->data;
> > +
> > + BT_DBG("hu %p skb %p", hu, skb);
> > +
> > + if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
> > + if (pcmd->ocf_ogf == ((OGF << 10) |
> BT_CMD_AUTO_SLEEP_MODE)) {
> > + if (pcmd->data[0] == BT_PS_ENABLE)
> > + psdata->ps_mode = PS_MODE_ENABLE;
> > + else if (pcmd->data[0] == BT_PS_DISABLE)
> > + psdata->ps_mode = PS_MODE_DISABLE;
> > + }
> > + if (pcmd->ocf_ogf == ((OGF << 10) | BT_CMD_WAKEUP_METHOD))
> > + psdata->wakeupmode = pcmd->data[2];
> > + }
> > +
> > + /* Prepend skb with frame type */
> > + memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
> > + skb_queue_tail(&nxp->txq, skb);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct h4_recv_pkt nxp_recv_pkts[] = {
> > + { H4_RECV_ACL, .recv = hci_recv_frame },
> > + { H4_RECV_SCO, .recv = hci_recv_frame },
> > + { H4_RECV_EVENT, .recv = hci_recv_frame },
> > + { H4_RECV_ISO, .recv = hci_recv_frame },
> > +};
> > +
> > +static struct sk_buff *nxp_recv_buf(struct hci_dev *hdev, struct sk_buff
> *skb,
> > + const unsigned char *buffer, int count,
> > + const struct h4_recv_pkt *pkts,
> > + int pkts_count) {
> > + struct hci_uart *hu = hci_get_drvdata(hdev);
> > + u8 alignment = hu->alignment ? hu->alignment : 1;
> > +
> > + /* Check for error from previous call */
> > + if (IS_ERR(skb))
> > + skb = NULL;
> > +
> > + while (count) {
> > + int i, len;
> > +
> > + /* remove padding bytes from buffer */
> > + for (; hu->padding && count > 0; hu->padding--) {
> > + count--;
> > + buffer++;
> > + }
> > + if (!count)
> > + break;
> > +
> > + if (!skb) {
> > + for (i = 0; i < pkts_count; i++) {
> > + if (buffer[0] != (&pkts[i])->type)
> > + continue;
> > +
> > + skb = bt_skb_alloc((&pkts[i])->maxlen,
> > + GFP_ATOMIC);
> > + if (!skb)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + hci_skb_pkt_type(skb) = (&pkts[i])->type;
> > + hci_skb_expect(skb) = (&pkts[i])->hlen;
> > + break;
> > + }
> > +
> > + /* Check for invalid packet type */
> > + if (!skb)
> > + return ERR_PTR(-EILSEQ);
> > +
> > + count -= 1;
> > + buffer += 1;
> > + }
> > +
> > + len = min_t(uint, hci_skb_expect(skb) - skb->len, count);
> > + skb_put_data(skb, buffer, len);
> > +
> > + count -= len;
> > + buffer += len;
> > +
> > + /* Check for partial packet */
> > + if (skb->len < hci_skb_expect(skb))
> > + continue;
> > +
> > + for (i = 0; i < pkts_count; i++) {
> > + if (hci_skb_pkt_type(skb) == (&pkts[i])->type)
> > + break;
> > + }
> > +
> > + if (i >= pkts_count) {
> > + kfree_skb(skb);
> > + return ERR_PTR(-EILSEQ);
> > + }
> > +
> > + if (skb->len == (&pkts[i])->hlen) {
> > + u16 dlen;
> > +
> > + switch ((&pkts[i])->lsize) {
> > + case 0:
> > + /* No variable data length */
> > + dlen = 0;
> > + break;
> > + case 1:
> > + /* Single octet variable length */
> > + dlen = skb->data[(&pkts[i])->loff];
> > + hci_skb_expect(skb) += dlen;
> > +
> > + if (skb_tailroom(skb) < dlen) {
> > + kfree_skb(skb);
> > + return ERR_PTR(-EMSGSIZE);
> > + }
> > + break;
> > + case 2:
> > + /* Double octet variable length */
> > + dlen = get_unaligned_le16(skb->data +
> > + (&pkts[i])->loff);
> > + hci_skb_expect(skb) += dlen;
> > +
> > + if (skb_tailroom(skb) < dlen) {
> > + kfree_skb(skb);
> > + return ERR_PTR(-EMSGSIZE);
> > + }
> > + break;
> > + default:
> > + /* Unsupported variable length */
> > + kfree_skb(skb);
> > + return ERR_PTR(-EILSEQ);
> > + }
> > +
> > + if (!dlen) {
> > + hu->padding = (skb->len - 1) % alignment;
> > + hu->padding = (alignment -
> > + hu->padding) % alignment;
> > +
> > + /* No more data, complete frame */
> > + if (hci_skb_pkt_type(skb) == HCI_EVENT_PKT)
> > + ps_check_event_packet(hu, skb);
> > + (&pkts[i])->recv(hdev, skb);
>
> If you are going to handle certain events directly by the driver it is probably a
> good idea to clone it, that said there exists some means to actually handle
> the events generated as response to commands, just use
> hci_cmd_sync_queue then use __hci_cmd_sync which will return you the skb
> of the event, that way you don't have to keep extra logic to intercept certain
> events.
Thanks for the suggestion. I re-wrote the driver code to use hci_cmd_sync_queue() and __hci_cmd_sync() and checked the status field of the event.
I removed this nxp_recv_buf() which checked for certain events, and called h4_recv buf() instead. The hci_nxp driver now has fewer lines of code :)
>
> > + skb = NULL;
> > + }
> > + } else {
> > + hu->padding = (skb->len - 1) % alignment;
> > + hu->padding = (alignment - hu->padding) %
> > + alignment;
> > +
> > + /* Complete frame */
> > + if (hci_skb_pkt_type(skb) == HCI_EVENT_PKT)
> > + ps_check_event_packet(hu, skb);
> > + (&pkts[i])->recv(hdev, skb);
> > + skb = NULL;
> > + }
> > + }
> > +
> > + return skb;
> > +}
> > +
> > +static int nxp_recv(struct hci_uart *hu, const void *data, int count)
> > +{
> > + struct nxp_struct *nxp = hu->priv;
> > +
> > + if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
> > + return -EUNATCH;
> > +
> > + ps_start_timer(hu);
> > +
> > + nxp->rx_skb = nxp_recv_buf(hu->hdev, nxp->rx_skb, data, count,
> > + nxp_recv_pkts, ARRAY_SIZE(nxp_recv_pkts));
> > + if (IS_ERR(nxp->rx_skb)) {
> > + int err = PTR_ERR(nxp->rx_skb);
> > +
> > + bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
> > + nxp->rx_skb = NULL;
> > + return err;
> > + }
> > +
> > + return count;
> > +}
> > +
> > +static struct sk_buff *nxp_dequeue(struct hci_uart *hu) {
> > + struct nxp_struct *nxp = hu->priv;
> > +
> > + if (ps_wakeup(hu)) {
> > + clear_bit(HCI_UART_SENDING, &hu->tx_state);
> > + return 0;
> > + }
> > + ps_start_timer(hu);
> > + return skb_dequeue(&nxp->txq); }
> > +
> > +static int nxp_setup(struct hci_uart *hu) {
> > + ps_init(hu);
> > + return 0;
> > +}
> > +
> > +static const struct hci_uart_proto nxpp = {
> > + .id = HCI_UART_NXP,
> > + .name = "NXP",
> > + .open = nxp_open,
> > + .close = nxp_close,
> > + .recv = nxp_recv,
> > + .enqueue = nxp_enqueue,
> > + .dequeue = nxp_dequeue,
> > + .flush = nxp_flush,
> > + .setup = nxp_setup,
> > +};
> > +
> > +int __init nxp_init(void)
> > +{
> > + return hci_uart_register_proto(&nxpp); }
> > +
> > +int __exit nxp_deinit(void)
> > +{
> > + return hci_uart_unregister_proto(&nxpp); }
> > diff --git a/drivers/bluetooth/hci_nxp.h b/drivers/bluetooth/hci_nxp.h
> > new file mode 100644 index 0000000..0ed5158
> > --- /dev/null
> > +++ b/drivers/bluetooth/hci_nxp.h
> > @@ -0,0 +1,110 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later */
> > +/*
> > + *
> > + * Bluetooth HCI UART driver
> > + * Copyright 2018-2022 NXP
> > + *
> > + *
> > + * This program is free software; you can redistribute it and/or
> > +modify
> > + * it under the terms of the GNU General Public License as published
> > +by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + *
> > + * 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.
> > + *
> > + */
> > +#ifndef _HCI_NXP_H_
> > +#define _HCI_NXP_H_
> > +
> > +#define TTY_FUNC tty->ops
> > +
> > +struct ps_data {
> > + u32 ps_mode;
> > + u32 cur_psmode;
> > + u32 ps_state;
> > + u32 ps_cmd;
> > + u32 interval;
> > + u32 wakeupmode;
> > + u32 cur_wakeupmode;
> > + u32 send_cmd;
> > + struct work_struct work;
> > + struct tty_struct *tty;
> > + struct timer_list ps_timer;
> > + u32 timer_on;
> > +};
> > +
> > +struct nxp_struct {
> > + struct sk_buff *rx_skb;
> > + struct sk_buff_head txq;
> > + struct list_head nxp_list_head;
> > + unsigned char id;
> > + struct ps_data *psdata;
> > +};
> > +
> > +/** Default ps timeout period in milli-second */
> > +#define DEFAULT_TIME_PERIOD 2000
> > +
> > +/** wakeup method DTR */
> > +#define WAKEUP_METHOD_DTR 0
> > +/** wakeup method break */
> > +#define WAKEUP_METHOD_BREAK 1
> > +/** wake up method EX break */
> > +#define WAKEUP_METHOD_EXT_BREAK 2
> > +/** wake up method RTS */
> > +#define WAKEUP_METHOD_RTS 3
> > +/** wakeup method invalid */
> > +#define WAKEUP_METHOD_INVALID 0xff
> > +
> > +/** ps mode disable */
> > +#define PS_MODE_DISABLE 0
> > +/** ps mode enable */
> > +#define PS_MODE_ENABLE 1
> > +
> > +/** ps cmd exit ps */
> > +#define PS_CMD_EXIT_PS 1
> > +/** ps cmd enter ps */
> > +#define PS_CMD_ENTER_PS 2
> > +
> > +/** ps state awake */
> > +#define PS_STATE_AWAKE 0
> > +/** ps state SLEEP */
> > +#define PS_STATE_SLEEP 1
> > +
> > +/** OGF */
> > +#define OGF 0x3F
> > +/** Bluetooth command : Sleep mode */
> > +#define BT_CMD_AUTO_SLEEP_MODE 0x23
> > +/** Bluetooth command: Wakeup method */
> > +#define BT_CMD_WAKEUP_METHOD 0x53
> > +
> > +/** Bluetooth Power State : Enable */
> > +#define BT_PS_ENABLE 0x02
> > +/** Bluetooth Power State : Disable */
> > +#define BT_PS_DISABLE 0x03
> > +
> > +/** Bluetooth Host Wakeup Methods **/
> > +#define BT_HOST_WAKEUP_METHOD_NONE 0x00
> > +#define BT_HOST_WAKEUP_METHOD_DTR 0x01
> > +#define BT_HOST_WAKEUP_METHOD_BREAK 0x02
> > +#define BT_HOST_WAKEUP_METHOD_GPIO 0x03
> > +#define BT_HOST_WAKEUP_DEFAULT_GPIO 5
> > +
> > +/** Bluetooth Chip Wakeup Methods **/
> > +#define BT_CTRL_WAKEUP_METHOD_DSR 0x00
> > +#define BT_CTRL_WAKEUP_METHOD_BREAK 0x01
> > +#define BT_CTRL_WAKEUP_METHOD_GPIO 0x02
> > +#define BT_CTRL_WAKEUP_METHOD_EXT_BREAK 0x04
> > +#define BT_CTRL_WAKEUP_METHOD_RTS 0x05
> > +#define BT_CTRL_WAKEUP_DEFAULT_GPIO 4
> > +
> > +#define HCI_OP_AUTO_SLEEP_MODE 0xfc23
> > +#define HCI_OP_WAKEUP_METHOD 0xfc53
> > +
> > +/** send cmd flags **/
> > +#define SEND_WAKEUP_METHOD_CMD 0x01
> > +#define SEND_AUTO_SLEEP_MODE_CMD 0x02
> > +
> > +#endif /* _HCI_UART_H_ */
> > diff --git a/drivers/bluetooth/hci_uart.h
> > b/drivers/bluetooth/hci_uart.h index fb4a2d0..17d271c 100644
> > --- a/drivers/bluetooth/hci_uart.h
> > +++ b/drivers/bluetooth/hci_uart.h
> > @@ -20,7 +20,7 @@
> > #define HCIUARTGETFLAGS _IOR('U', 204, int)
> >
> > /* UART protocols */
> > -#define HCI_UART_MAX_PROTO 12
> > +#define HCI_UART_MAX_PROTO 13
> >
> > #define HCI_UART_H4 0
> > #define HCI_UART_BCSP 1
> > @@ -34,6 +34,7 @@
> > #define HCI_UART_AG6XX 9
> > #define HCI_UART_NOKIA 10
> > #define HCI_UART_MRVL 11
> > +#define HCI_UART_NXP 12
> >
> > #define HCI_UART_RAW_DEVICE 0
> > #define HCI_UART_RESET_ON_INIT 1
> > @@ -200,3 +201,8 @@ int ag6xx_deinit(void); int mrvl_init(void); int
> > mrvl_deinit(void); #endif
> > +
> > +#ifdef CONFIG_BT_HCIUART_NXP
> > +int nxp_init(void);
> > +int nxp_deinit(void);
> > +#endif
> > --
> > 2.7.4
> >
>
>
> --
> Luiz Augusto von Dentz
Thanks,
Neeraj
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