Enhance Broadcom protocol with the UART setup, firmware download
and power management.
Signed-off-by: Ilya Faenson <ifaenson@xxxxxxxxxxxx>
---
drivers/bluetooth/hci_bcm.c | 528 ++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 513 insertions(+), 15 deletions(-)
diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 1ec0b4a..ccd92ed 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -1,8 +1,9 @@
/*
*
- * Bluetooth HCI UART driver for Broadcom devices
+ * Bluetooth UART H4 protocol for Broadcom devices
*
* Copyright (C) 2015 Intel Corporation
+ * Copyright (C) 2015 Broadcom Corporation
*
*
* This program is free software; you can redistribute it and/or modify
@@ -21,48 +22,413 @@
*
*/
+#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 <linux/gpio/consumer.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
-#include "btbcm.h"
#include "hci_uart.h"
+#include "btbcm.h"
+#include "btbcm_uart.h"
struct bcm_data {
struct sk_buff *rx_skb;
struct sk_buff_head txq;
+ struct hci_uart *hu;
+
+ bool is_suspended; /* suspend/resume flag */
+
+ struct timer_list timer; /* idle timer */
+
+ struct btbcm_uart_parameters pars; /* device parameters */
+ void *device_context; /* ACPI/DT device context */
};
+/* Suspend/resume synchronization mutex */
+static DEFINE_MUTEX(plock);
+
+/*
+ * Callbacks from the BCMBT_UART device
+ */
+
+/*
+ * The platform is suspending. Stop UART activity
+ */
+static void suspend_notification(void *context)
+{
+ struct ktermios ktermios;
+ struct hci_uart *hu = (struct hci_uart *)context;
+ struct bcm_data *h4 = hu->priv;
+ struct tty_struct *tty = hu->tty;
+ int status;
+ unsigned int set = 0;
+ unsigned int clear = 0;
+
+ BT_DBG("suspend_notification with is_suspended %d", h4->is_suspended);
+
+ if (!h4->pars.configure_sleep)
+ return;
+
+ if (!h4->is_suspended) {
+ if (h4->pars.manual_fc) {
+ /* Disable hardware flow control */
+ ktermios = tty->termios;
+ ktermios.c_cflag &= ~CRTSCTS;
+ status = tty_set_termios(tty, &ktermios);
+ if (status)
+ BT_DBG("suspend_notification dis fc fail %d",
+ status);
+ else
+ BT_DBG("suspend_notification hw fc disabled");
+
+ /* Clear RTS to prevent the device from sending */
+ /* (most PCs need OUT2 to enable interrupts) */
+ status = tty->driver->ops->tiocmget(tty);
+ BT_DBG("suspend_notification cur tiocm 0x%x", status);
+ set &= ~(TIOCM_OUT2 | TIOCM_RTS);
+ clear = ~set;
+ set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
+ TIOCM_OUT2 | TIOCM_LOOP;
+ clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
+ TIOCM_OUT2 | TIOCM_LOOP;
+ status = tty->driver->ops->tiocmset(tty, set, clear);
+ if (status)
+ BT_DBG("suspend_notification clr RTS fail %d",
+ status);
+ else
+ BT_DBG("suspend_notification RTS cleared");
+ status = tty->driver->ops->tiocmget(tty);
+ BT_DBG("suspend_notification end tiocm 0x%x", status);
+ }
+
+ /* Once this callback returns, driver suspends BT via GPIO */
+ h4->is_suspended = true;
+ }
+}
+
+/*
+ * The platform is resuming. Resume UART activity.
+ */
+static void resume_notification(void *context)
+{
+ struct ktermios ktermios;
+ struct hci_uart *hu = (struct hci_uart *)context;
+ struct bcm_data *h4 = hu->priv;
+ struct tty_struct *tty = hu->tty;
+ int status;
+ unsigned int set = 0;
+ unsigned int clear = 0;
+
+ BT_DBG("resume_notification with is_suspended %d", h4->is_suspended);
+
+ if (!h4->pars.configure_sleep)
+ return;
+
+ /* When this callback executes, the device has woken up already */
+ if (h4->is_suspended) {
+ h4->is_suspended = false;
+
+ if (h4->pars.manual_fc) {
+ status = tty->driver->ops->tiocmget(tty);
+ BT_DBG("resume_notification cur tiocm 0x%x", status);
+ set |= (TIOCM_OUT2 | TIOCM_RTS);
+ clear = ~set;
+ set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
+ TIOCM_OUT2 | TIOCM_LOOP;
+ clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
+ TIOCM_OUT2 | TIOCM_LOOP;
+ status = tty->driver->ops->tiocmset(tty, set, clear);
+ if (status)
+ BT_DBG("resume_notification set RTS fail %d",
+ status);
+ else
+ BT_DBG("resume_notification RTS set");
+
+ /* Re-enable hardware flow control */
+ ktermios = tty->termios;
+ ktermios.c_cflag |= CRTSCTS;
+ status = tty_set_termios(tty, &ktermios);
+ if (status)
+ BT_DBG("resume_notification enable fc fail %d",
+ status);
+ else
+ BT_DBG("resume_notification hw fc re-enabled");
+ }
+ }
+
+ /* If we're resumed, the idle timer must be running */
+ status = mod_timer(&h4->timer, jiffies +
+ msecs_to_jiffies(h4->pars.idle_timeout_in_secs * 1000));
+}
+
+/*
+ * The BT device is resuming. Resume UART activity if suspended
+ */
+static void wakeup_notification(void *context)
+{
+ struct ktermios ktermios;
+ struct hci_uart *hu = (struct hci_uart *)context;
+ struct bcm_data *h4 = hu->priv;
+ struct tty_struct *tty = hu->tty;
+ int status;
+ unsigned int set = 0;
+ unsigned int clear = 0;
+
+ if (!h4->pars.configure_sleep)
+ return;
+
+ status = tty->driver->ops->tiocmget(tty);
+ BT_DBG("wakeup_notification hu %p current tiocm 0x%x", hu, status);
+ if (h4->is_suspended) {
+ if (h4->pars.manual_fc) {
+ set |= (TIOCM_OUT2 | TIOCM_RTS);
+ clear = ~set;
+ set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
+ TIOCM_OUT2 | TIOCM_LOOP;
+ clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
+ TIOCM_OUT2 | TIOCM_LOOP;
+ status = tty->driver->ops->tiocmset(tty, set, clear);
+ if (status)
+ BT_DBG("wakeup_notification set RTS fail %d",
+ status);
+ else
+ BT_DBG("wakeup_notification RTS set");
+
+ /* Re-enable hardware flow control */
+ ktermios = tty->termios;
+ ktermios.c_cflag |= CRTSCTS;
+ status = tty_set_termios(tty, &ktermios);
+ if (status)
+ BT_DBG("wakeup_notification fc-en failure %d",
+ status);
+ else
+ BT_DBG("wakeup_notification hw fc re-enabled");
+ }
+
+ h4->is_suspended = false;
+ }
+
+ /* If we're resumed, the idle timer must be running */
+ status = mod_timer(&h4->timer, jiffies + msecs_to_jiffies(
+ h4->pars.idle_timeout_in_secs * 1000));
+}
+
+/*
+ * Make sure we're awake
+ * (called when the resumed state is required)
+ */
+static void bcm_ensure_wakeup(struct hci_uart *hu)
+{
+ struct bcm_data *h4 = hu->priv;
+ int status;
+
+ if (!h4->pars.configure_sleep)
+ return;
+
+ /* Suspend/resume operations are serialized */
+ mutex_lock(&plock);
+
+ /* Nothing to do if resumed already */
+ if (!h4->is_suspended) {
+ mutex_unlock(&plock);
+
+ /* Just reset the timer */
+ status = mod_timer(&h4->timer, jiffies + msecs_to_jiffies(
+ h4->pars.idle_timeout_in_secs * 1000));
+ return;
+ }
+
+ /* Wakeup the device */
+ status = btbcm_uart_control(BTBCM_UART_ACTION_RESUME,
+ h4->device_context, NULL, NULL);
+ if (status)
+ BT_DBG("bcm_ensure_wakeup failed to resume driver %d", status);
+
+ /* Unflow control the port if configured */
+ resume_notification(hu);
+
+ mutex_unlock(&plock);
+}
+
+/*
+ * Idle timer callback
+ */
+static void bcm_idle_timeout(unsigned long arg)
+{
+ struct hci_uart *hu = (struct hci_uart *)arg;
+ struct bcm_data *h4 = hu->priv;
+ int status;
+
+ BT_DBG("bcm_idle_timeout hu %p", hu);
+
+ /* Suspend/resume operations are serialized */
+ mutex_lock(&plock);
+
+ if (!h4->is_suspended) {
+ /* Flow control the port if configured */
+ suspend_notification(hu);
+
+ /* Suspend the device */
+ status = btbcm_uart_control(BTBCM_UART_ACTION_SUSPEND,
+ h4->device_context, NULL, NULL);
+ if (status)
+ BT_DBG("bcm_idle_timeout failed to suspend device %d",
+ status);
+ }
+
+ mutex_unlock(&plock);
+}
+
static int bcm_open(struct hci_uart *hu)
{
- struct bcm_data *bcm;
+ struct btbcm_uart_callbacks callbacks;
+ unsigned long callbacks_size = sizeof(callbacks);
+ int status;
+ struct bcm_data *h4;
+ struct tty_struct *tty = hu->tty;
- BT_DBG("hu %p", hu);
+ BT_DBG("bcm_h4_open hu %p", hu);
- bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
- if (!bcm)
+ h4 = kzalloc(sizeof(*h4), GFP_KERNEL);
+ if (!h4)
return -ENOMEM;
- skb_queue_head_init(&bcm->txq);
+ skb_queue_head_init(&h4->txq);
+ hu->priv = h4;
+ h4->hu = hu;
+ h4->is_suspended = false;
+
+ /* Configure callbacks on the driver */
+ callbacks.interface_version = BTBCM_UART_INTERFACE_VERSION;
+ callbacks.context = hu;
+ strcpy(callbacks.name, tty->name);
+ callbacks.p_suspend = suspend_notification;
+ callbacks.p_resume = resume_notification;
+ callbacks.p_wakeup = wakeup_notification;
+ status = btbcm_uart_control(BTBCM_UART_ACTION_CONFIGURE_CALLBACKS,
+ NULL, &callbacks, &callbacks_size);
+ if (status) {
+ BT_DBG("bcm_h4_open failed to set driver callbacks %d", status);
+ return status;
+ }
+ if (callbacks_size != sizeof(void *)) {
+ BT_DBG("bcm_h4_open got back %d bytes from callbacks?!",
+ (int)callbacks_size);
+ return -EMSGSIZE;
+ }
+ memcpy(&h4->device_context, &callbacks, sizeof(void *));
+ BT_DBG("bcm_h4_open callbacks context %p", h4->device_context);
+
+ /* Retrieve device parameters */
+ callbacks_size = sizeof(h4->pars);
+ status = btbcm_uart_control(BTBCM_UART_ACTION_GET_PARAMETERS,
+ h4->device_context, &h4->pars,
+ &callbacks_size);
+ if (status) {
+ BT_DBG("bcm_h4_open failed to get dev parameters %d", status);
+ return status;
+ }
+ BT_DBG("Pars ver %d csleep %d dalow %d balow %d idle %d",
+ h4->pars.interface_version, h4->pars.configure_sleep,
+ h4->pars.dev_wake_active_low, h4->pars.bt_wake_active_low,
+ h4->pars.idle_timeout_in_secs);
+
+ /* Cycle power to make sure the device is in the known state */
+ status = btbcm_uart_control(BTBCM_UART_ACTION_POWER_OFF,
+ h4->device_context, NULL, NULL);
+ if (status) {
+ BT_DBG("bcm_h4_open failed to power off %d", status);
+ } else {
+ status = btbcm_uart_control(BTBCM_UART_ACTION_POWER_ON,
+ h4->device_context, NULL, NULL);
+ if (status)
+ BT_DBG("bcm_h4_open failed to power on %d", status);
+ }
+
+ /* Start the idle timer */
+ if (h4->pars.configure_sleep) {
+ setup_timer(&h4->timer, bcm_idle_timeout, (unsigned long)hu);
+ if (h4->pars.configure_sleep)
+ mod_timer(&h4->timer, jiffies + msecs_to_jiffies(
+ h4->pars.idle_timeout_in_secs * 1000));
+ }
- hu->priv = bcm;
return 0;
}
static int bcm_close(struct hci_uart *hu)
{
- struct bcm_data *bcm = hu->priv;
+ struct btbcm_uart_callbacks callbacks;
+ unsigned long callbacks_size = sizeof(callbacks);
+ struct bcm_data *h4 = hu->priv;
+ int status;
- BT_DBG("hu %p", hu);
+ hu->priv = NULL;
- skb_queue_purge(&bcm->txq);
- kfree_skb(bcm->rx_skb);
- kfree(bcm);
+ BT_DBG("bcm_h4_close hu %p", hu);
+
+ /* If we're being closed, we must suspend */
+ if (h4->pars.configure_sleep) {
+ mutex_lock(&plock);
+
+ if (!h4->is_suspended) {
+ /* Flow control the port */
+ suspend_notification(hu);
+
+ /* Suspend the device */
+ status = btbcm_uart_control(BTBCM_UART_ACTION_SUSPEND,
+ h4->device_context, NULL,
+ NULL);
+ if (status) {
+ BT_DBG("bcm_h4_close suspend driver fail %d",
+ status);
+ }
+ }
+
+ mutex_unlock(&plock);
+
+ del_timer_sync(&h4->timer);
+ }
+
+ /* Power off the device if possible */
+ status = btbcm_uart_control(BTBCM_UART_ACTION_POWER_OFF,
+ h4->device_context, NULL, NULL);
+ if (status)
+ BT_DBG("bcm_h4_close failed to power off %d", status);
+
+ /* de-configure callbacks on the driver */
+ callbacks.interface_version = BTBCM_UART_INTERFACE_VERSION;
+ callbacks.context = hu;
+ callbacks.p_suspend = NULL;
+ callbacks.p_resume = NULL;
+ callbacks.p_wakeup = NULL;
+ status = btbcm_uart_control(BTBCM_UART_ACTION_CONFIGURE_CALLBACKS,
+ h4->device_context, &callbacks,
+ &callbacks_size);
+ if (status)
+ BT_DBG("bcm_h4_close failed to reset drv callbacks %d", status);
+ skb_queue_purge(&h4->txq);
hu->priv = NULL;
+ kfree(h4);
+
return 0;
}
@@ -79,11 +445,137 @@ static int bcm_flush(struct hci_uart *hu)
static int bcm_setup(struct hci_uart *hu)
{
- BT_DBG("hu %p", hu);
+ struct bcm_data *h4 = hu->priv;
+ int status;
+ struct sk_buff *skb;
+ unsigned char sleep_pars[] = {
+ 0x01, /* sleep mode 1=UART */
+ 0x02, /* idle threshold HOST (value * 300ms) */
+ 0x02, /* idle threshold HC (value * 300ms) */
+ 0x01, /* BT_WAKE active mode - 1=active high, 0 = active low */
+ 0x00, /* HOST_WAKE active mode - 1=active high, 0 = active low */
+ 0x01, /* Allow host sleep during SCO - FALSE */
+ 0x01, /* combine sleep mode and LPM - 1 == TRUE */
+ 0x00, /* enable tristate control of UART TX line - FALSE */
+ 0x00, /* USB auto-sleep on USB SUSPEND */
+ 0x00, /* USB USB RESUME timeout (seconds) */
+ 0x00, /* Pulsed Host Wake */
+ 0x00 /* Enable Break To Host */
+ };
+ unsigned char pcm_int_pars[] = {
+ 0x00, /* 0=PCM routing, 1=SCO over HCI */
+ 0x02, /* 0=128Kbps,1=256Kbps,2=512Kbps,3=1024Kbps,4=2048Kbps */
+ 0x00, /* short frame sync 0=short, 1=long */
+ 0x00, /* sync mode 0=slave, 1=master */
+ 0x00 /* clock mode 0=slave, 1=master */
+ };
+ unsigned char pcm_format_pars[] = {
+ 0x00, /* LSB_First 1=TRUE, 0=FALSE */
+ 0x00, /* Fill_Value (use 0-7 for fill bits value) */
+ 0x02, /* Fill_Method (2=sign extended) */
+ 0x03, /* Fill_Num # of fill bits 0-3) */
+ 0x01 /* Right_Justify 1=TRUE, 0=FALSE */
+ };
+ unsigned char time_slot_number = 0;
+
+ BT_DBG("bcm_h4_setup hu %p", hu);
+
+ /* Bring the UART into known default state */
+ status = btbcm_init_uart(hu);
+ if (status) {
+ BT_DBG("bcm_h4_setup failed to init BT device %d", status);
+ return status;
+ }
+
+ /* Basic sanity check */
+ skb = __hci_cmd_sync(hu->hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
+ if (IS_ERR(skb)) {
+ status = PTR_ERR(skb);
+ BT_ERR("bcm_h4_setup HCI Reset failed (%d)", status);
+ return status;
+ }
+ kfree_skb(skb);
+ BT_DBG("bcm_h4_setup HCI Reset succeeded");
+
+ /* Set the new baud rate */
+ status = btbcm_set_baud_rate(hu,
+ h4->pars.baud_rate_before_config_download);
+ if (status) {
+ BT_ERR("bcm_h4_setup set_baud_rate faiilure %d", status);
+ return status;
+ }
hu->hdev->set_bdaddr = btbcm_set_bdaddr;
- return btbcm_setup_patchram(hu->hdev);
+ /* Download the firmware and reconfigure the UART afterwards */
+ status = btbcm_setup_patchram(hu->hdev);
+ if (status) {
+ BT_ERR("bcm_h4_setup setup_patchram faiilure %d", status);
+ return status;
+ }
+
+ /* Configure SCO PCM parameters */
+ if (h4->pars.configure_audio) {
+ pcm_int_pars[0] = h4->pars.PCMRouting;
+ pcm_int_pars[1] = h4->pars.PCMInCallBitclock;
+ pcm_int_pars[2] = h4->pars.PCMShortFrameSync;
+ pcm_int_pars[3] = h4->pars.PCMSyncMode;
+ pcm_int_pars[4] = h4->pars.PCMClockMode;
+ skb = __hci_cmd_sync(hu->hdev, 0xfc1c, sizeof(pcm_int_pars),
+ pcm_int_pars, HCI_INIT_TIMEOUT);
+ if (IS_ERR(skb)) {
+ status = PTR_ERR(skb);
+ BT_ERR("bcm_h4_setup PCM INT VSC failed (%d)", status);
+ return status;
+ }
+ kfree_skb(skb);
+ BT_DBG("bcm_h4_setup PCM INT Parameters VSC succeeded");
+
+ pcm_format_pars[0] = h4->pars.PCMLSBFirst;
+ pcm_format_pars[1] = h4->pars.PCMFillValue;
+ pcm_format_pars[2] = h4->pars.PCMFillMethod;
+ pcm_format_pars[3] = h4->pars.PCMFillNum;
+ pcm_format_pars[4] = h4->pars.PCMRightJustify;
+ skb = __hci_cmd_sync(hu->hdev, 0xfc1e, sizeof(pcm_format_pars),
+ pcm_format_pars, HCI_INIT_TIMEOUT);
+ if (IS_ERR(skb)) {
+ status = PTR_ERR(skb);
+ BT_ERR("bcm_h4_setup PCM Format VSC failed (%d)",
+ status);
+ return status;
+ }
+ kfree_skb(skb);
+ BT_DBG("bcm_h4_setup PCM Format VSC succeeded");
+
+ skb = __hci_cmd_sync(hu->hdev, 0xfc22, sizeof(time_slot_number),
+ &time_slot_number, HCI_INIT_TIMEOUT);
+ if (IS_ERR(skb)) {
+ status = PTR_ERR(skb);
+ BT_ERR("bcm_h4_setup SCO Time Slot VSC failed (%d)",
+ status);
+ return status;
+ }
+ kfree_skb(skb);
+ BT_DBG("bcm_h4_setup SCO Time Slot VSC succeeded");
+ }
+
+ /* Configure device's suspend/resume operation */
+ if (h4->pars.configure_sleep) {
+ /* Override the default */
+ sleep_pars[3] = (unsigned char)!h4->pars.bt_wake_active_low;
+ sleep_pars[4] = (unsigned char)!h4->pars.dev_wake_active_low;
+ skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_pars),
+ sleep_pars, HCI_INIT_TIMEOUT);
+ if (IS_ERR(skb)) {
+ status = PTR_ERR(skb);
+ BT_ERR("bcm_h4_setup Sleep VSC failed (%d)", status);
+ return status;
+ }
+ kfree_skb(skb);
+ BT_DBG("bcm_h4_setup Set Sleep Parameters VSC succeeded");
+ }
+
+ return 0;
}
static const struct h4_recv_pkt bcm_recv_pkts[] = {
@@ -99,6 +591,9 @@ static int bcm_recv(struct hci_uart *hu, const void *data, int count)
if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
return -EUNATCH;
+ /* Make sure we're resumed */
+ bcm_ensure_wakeup(hu);
+
bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
if (IS_ERR(bcm->rx_skb)) {
@@ -116,6 +611,9 @@ static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
BT_DBG("hu %p skb %p", hu, skb);
+ /* Make sure we're resumed */
+ bcm_ensure_wakeup(hu);
+
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
skb_queue_tail(&bcm->txq, skb);
--
1.9.1
--
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