[PATCH linux dev-4.7 4/8] ipmi: add an Aspeed BT IPMI BMC driver
Joel Stanley
joel at jms.id.au
Wed Nov 2 11:00:30 AEDT 2016
Hey Cedric,
On Wed, Oct 26, 2016 at 5:27 PM, Cédric Le Goater <clg at kaod.org> wrote:
> Backport from mainline of the main IPMI BMC driver patch plus fixes :
>
> - commit d94655b405ba ("ipmi/bt-bmc: remove redundant return value
> check of platform_get_resource()")
> - commit a3e6061bad62 ("ipmi/bt-bmc: add a dependency on
> ARCH_ASPEED")
> - commit 1a377a79211a ("ipmi: Fix ioremap error handling in bt-bmc")
> - commit 54f9c4d0778b ("ipmi: add an Aspeed BT IPMI BMC driver")
It has just occurred to me that this driver is written for the iBT
hardware in the Aspeed, and we also have the BT hardware.
If we were to write a driver for the BT hardware it would clash with
this one. In particular the compatible string and the character device
name.
I propose sending a patch to upstream before the release of 4.9 that
changes the chardev name to ipmi-ibt-host and changing the comaptible
string to ast2400-ibt-bmc.
What do you think?
Cheers,
Joel
>
> Signed-off-by: Cédric Le Goater <clg at kaod.org>
> ---
> .../bindings/char/ipmi/aspeed,ast2400-bt-bmc.txt | 23 +
> drivers/Makefile | 2 +-
> drivers/char/ipmi/Kconfig | 8 +
> drivers/char/ipmi/Makefile | 1 +
> drivers/char/ipmi/bt-bmc.c | 505 +++++++++++++++++++++
> include/uapi/linux/Kbuild | 1 +
> include/uapi/linux/bt-bmc.h | 18 +
> 7 files changed, 557 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/devicetree/bindings/char/ipmi/aspeed,ast2400-bt-bmc.txt
> create mode 100644 drivers/char/ipmi/bt-bmc.c
> create mode 100644 include/uapi/linux/bt-bmc.h
>
> diff --git a/Documentation/devicetree/bindings/char/ipmi/aspeed,ast2400-bt-bmc.txt b/Documentation/devicetree/bindings/char/ipmi/aspeed,ast2400-bt-bmc.txt
> new file mode 100644
> index 000000000000..fbbacd958240
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/char/ipmi/aspeed,ast2400-bt-bmc.txt
> @@ -0,0 +1,23 @@
> +* Aspeed BT (Block Transfer) IPMI interface
> +
> +The Aspeed SOCs (AST2400 and AST2500) are commonly used as BMCs
> +(BaseBoard Management Controllers) and the BT interface can be used to
> +perform in-band IPMI communication with their host.
> +
> +Required properties:
> +
> +- compatible : should be "aspeed,ast2400-bt-bmc"
> +- reg: physical address and size of the registers
> +
> +Optional properties:
> +
> +- interrupts: interrupt generated by the BT interface. without an
> + interrupt, the driver will operate in poll mode.
> +
> +Example:
> +
> + ibt at 1e789140 {
> + compatible = "aspeed,ast2400-bt-bmc";
> + reg = <0x1e789140 0x18>;
> + interrupts = <8>;
> + };
> diff --git a/drivers/Makefile b/drivers/Makefile
> index 0b6f3d60193d..0a7c60d3b6cc 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -21,7 +21,7 @@ obj-y += video/
> obj-y += idle/
>
> # IPMI must come before ACPI in order to provide IPMI opregion support
> -obj-$(CONFIG_IPMI_HANDLER) += char/ipmi/
> +obj-y += char/ipmi/
>
> obj-$(CONFIG_ACPI) += acpi/
> obj-$(CONFIG_SFI) += sfi/
> diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig
> index 6ed9e9fe5233..927fe355442a 100644
> --- a/drivers/char/ipmi/Kconfig
> +++ b/drivers/char/ipmi/Kconfig
> @@ -88,3 +88,11 @@ config IPMI_POWEROFF
> the IPMI management controller is capable of this.
>
> endif # IPMI_HANDLER
> +
> +config ASPEED_BT_IPMI_BMC
> + depends on ARCH_ASPEED
> + tristate "BT IPMI bmc driver"
> + help
> + Provides a driver for the BT (Block Transfer) IPMI interface
> + found on Aspeed SOCs (AST2400 and AST2500). The driver
> + implements the BMC side of the BT interface.
> diff --git a/drivers/char/ipmi/Makefile b/drivers/char/ipmi/Makefile
> index f3ffde1f5f1f..0d98cd91def1 100644
> --- a/drivers/char/ipmi/Makefile
> +++ b/drivers/char/ipmi/Makefile
> @@ -11,3 +11,4 @@ obj-$(CONFIG_IPMI_SSIF) += ipmi_ssif.o
> obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o
> obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o
> obj-$(CONFIG_IPMI_POWEROFF) += ipmi_poweroff.o
> +obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o
> diff --git a/drivers/char/ipmi/bt-bmc.c b/drivers/char/ipmi/bt-bmc.c
> new file mode 100644
> index 000000000000..b49e61320952
> --- /dev/null
> +++ b/drivers/char/ipmi/bt-bmc.c
> @@ -0,0 +1,505 @@
> +/*
> + * Copyright (c) 2015-2016, IBM Corporation.
> + *
> + * 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.
> + */
> +
> +#include <linux/atomic.h>
> +#include <linux/bt-bmc.h>
> +#include <linux/errno.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/miscdevice.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/poll.h>
> +#include <linux/sched.h>
> +#include <linux/timer.h>
> +
> +/*
> + * This is a BMC device used to communicate to the host
> + */
> +#define DEVICE_NAME "ipmi-bt-host"
> +
> +#define BT_IO_BASE 0xe4
> +#define BT_IRQ 10
> +
> +#define BT_CR0 0x0
> +#define BT_CR0_IO_BASE 16
> +#define BT_CR0_IRQ 12
> +#define BT_CR0_EN_CLR_SLV_RDP 0x8
> +#define BT_CR0_EN_CLR_SLV_WRP 0x4
> +#define BT_CR0_ENABLE_IBT 0x1
> +#define BT_CR1 0x4
> +#define BT_CR1_IRQ_H2B 0x01
> +#define BT_CR1_IRQ_HBUSY 0x40
> +#define BT_CR2 0x8
> +#define BT_CR2_IRQ_H2B 0x01
> +#define BT_CR2_IRQ_HBUSY 0x40
> +#define BT_CR3 0xc
> +#define BT_CTRL 0x10
> +#define BT_CTRL_B_BUSY 0x80
> +#define BT_CTRL_H_BUSY 0x40
> +#define BT_CTRL_OEM0 0x20
> +#define BT_CTRL_SMS_ATN 0x10
> +#define BT_CTRL_B2H_ATN 0x08
> +#define BT_CTRL_H2B_ATN 0x04
> +#define BT_CTRL_CLR_RD_PTR 0x02
> +#define BT_CTRL_CLR_WR_PTR 0x01
> +#define BT_BMC2HOST 0x14
> +#define BT_INTMASK 0x18
> +#define BT_INTMASK_B2H_IRQEN 0x01
> +#define BT_INTMASK_B2H_IRQ 0x02
> +#define BT_INTMASK_BMC_HWRST 0x80
> +
> +#define BT_BMC_BUFFER_SIZE 256
> +
> +struct bt_bmc {
> + struct device dev;
> + struct miscdevice miscdev;
> + void __iomem *base;
> + int irq;
> + wait_queue_head_t queue;
> + struct timer_list poll_timer;
> + struct mutex mutex;
> +};
> +
> +static atomic_t open_count = ATOMIC_INIT(0);
> +
> +static u8 bt_inb(struct bt_bmc *bt_bmc, int reg)
> +{
> + return ioread8(bt_bmc->base + reg);
> +}
> +
> +static void bt_outb(struct bt_bmc *bt_bmc, u8 data, int reg)
> +{
> + iowrite8(data, bt_bmc->base + reg);
> +}
> +
> +static void clr_rd_ptr(struct bt_bmc *bt_bmc)
> +{
> + bt_outb(bt_bmc, BT_CTRL_CLR_RD_PTR, BT_CTRL);
> +}
> +
> +static void clr_wr_ptr(struct bt_bmc *bt_bmc)
> +{
> + bt_outb(bt_bmc, BT_CTRL_CLR_WR_PTR, BT_CTRL);
> +}
> +
> +static void clr_h2b_atn(struct bt_bmc *bt_bmc)
> +{
> + bt_outb(bt_bmc, BT_CTRL_H2B_ATN, BT_CTRL);
> +}
> +
> +static void set_b_busy(struct bt_bmc *bt_bmc)
> +{
> + if (!(bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_B_BUSY))
> + bt_outb(bt_bmc, BT_CTRL_B_BUSY, BT_CTRL);
> +}
> +
> +static void clr_b_busy(struct bt_bmc *bt_bmc)
> +{
> + if (bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_B_BUSY)
> + bt_outb(bt_bmc, BT_CTRL_B_BUSY, BT_CTRL);
> +}
> +
> +static void set_b2h_atn(struct bt_bmc *bt_bmc)
> +{
> + bt_outb(bt_bmc, BT_CTRL_B2H_ATN, BT_CTRL);
> +}
> +
> +static u8 bt_read(struct bt_bmc *bt_bmc)
> +{
> + return bt_inb(bt_bmc, BT_BMC2HOST);
> +}
> +
> +static ssize_t bt_readn(struct bt_bmc *bt_bmc, u8 *buf, size_t n)
> +{
> + int i;
> +
> + for (i = 0; i < n; i++)
> + buf[i] = bt_read(bt_bmc);
> + return n;
> +}
> +
> +static void bt_write(struct bt_bmc *bt_bmc, u8 c)
> +{
> + bt_outb(bt_bmc, c, BT_BMC2HOST);
> +}
> +
> +static ssize_t bt_writen(struct bt_bmc *bt_bmc, u8 *buf, size_t n)
> +{
> + int i;
> +
> + for (i = 0; i < n; i++)
> + bt_write(bt_bmc, buf[i]);
> + return n;
> +}
> +
> +static void set_sms_atn(struct bt_bmc *bt_bmc)
> +{
> + bt_outb(bt_bmc, BT_CTRL_SMS_ATN, BT_CTRL);
> +}
> +
> +static struct bt_bmc *file_bt_bmc(struct file *file)
> +{
> + return container_of(file->private_data, struct bt_bmc, miscdev);
> +}
> +
> +static int bt_bmc_open(struct inode *inode, struct file *file)
> +{
> + struct bt_bmc *bt_bmc = file_bt_bmc(file);
> +
> + if (atomic_inc_return(&open_count) == 1) {
> + clr_b_busy(bt_bmc);
> + return 0;
> + }
> +
> + atomic_dec(&open_count);
> + return -EBUSY;
> +}
> +
> +/*
> + * The BT (Block Transfer) interface means that entire messages are
> + * buffered by the host before a notification is sent to the BMC that
> + * there is data to be read. The first byte is the length and the
> + * message data follows. The read operation just tries to capture the
> + * whole before returning it to userspace.
> + *
> + * BT Message format :
> + *
> + * Byte 1 Byte 2 Byte 3 Byte 4 Byte 5:N
> + * Length NetFn/LUN Seq Cmd Data
> + *
> + */
> +static ssize_t bt_bmc_read(struct file *file, char __user *buf,
> + size_t count, loff_t *ppos)
> +{
> + struct bt_bmc *bt_bmc = file_bt_bmc(file);
> + u8 len;
> + int len_byte = 1;
> + u8 kbuffer[BT_BMC_BUFFER_SIZE];
> + ssize_t ret = 0;
> + ssize_t nread;
> +
> + if (!access_ok(VERIFY_WRITE, buf, count))
> + return -EFAULT;
> +
> + WARN_ON(*ppos);
> +
> + if (wait_event_interruptible(bt_bmc->queue,
> + bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_H2B_ATN))
> + return -ERESTARTSYS;
> +
> + mutex_lock(&bt_bmc->mutex);
> +
> + if (unlikely(!(bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_H2B_ATN))) {
> + ret = -EIO;
> + goto out_unlock;
> + }
> +
> + set_b_busy(bt_bmc);
> + clr_h2b_atn(bt_bmc);
> + clr_rd_ptr(bt_bmc);
> +
> + /*
> + * The BT frames start with the message length, which does not
> + * include the length byte.
> + */
> + kbuffer[0] = bt_read(bt_bmc);
> + len = kbuffer[0];
> +
> + /* We pass the length back to userspace as well */
> + if (len + 1 > count)
> + len = count - 1;
> +
> + while (len) {
> + nread = min_t(ssize_t, len, sizeof(kbuffer) - len_byte);
> +
> + bt_readn(bt_bmc, kbuffer + len_byte, nread);
> +
> + if (copy_to_user(buf, kbuffer, nread + len_byte)) {
> + ret = -EFAULT;
> + break;
> + }
> + len -= nread;
> + buf += nread + len_byte;
> + ret += nread + len_byte;
> + len_byte = 0;
> + }
> +
> + clr_b_busy(bt_bmc);
> +
> +out_unlock:
> + mutex_unlock(&bt_bmc->mutex);
> + return ret;
> +}
> +
> +/*
> + * BT Message response format :
> + *
> + * Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6:N
> + * Length NetFn/LUN Seq Cmd Code Data
> + */
> +static ssize_t bt_bmc_write(struct file *file, const char __user *buf,
> + size_t count, loff_t *ppos)
> +{
> + struct bt_bmc *bt_bmc = file_bt_bmc(file);
> + u8 kbuffer[BT_BMC_BUFFER_SIZE];
> + ssize_t ret = 0;
> + ssize_t nwritten;
> +
> + /*
> + * send a minimum response size
> + */
> + if (count < 5)
> + return -EINVAL;
> +
> + if (!access_ok(VERIFY_READ, buf, count))
> + return -EFAULT;
> +
> + WARN_ON(*ppos);
> +
> + /*
> + * There's no interrupt for clearing bmc busy so we have to
> + * poll
> + */
> + if (wait_event_interruptible(bt_bmc->queue,
> + !(bt_inb(bt_bmc, BT_CTRL) &
> + (BT_CTRL_H_BUSY | BT_CTRL_B2H_ATN))))
> + return -ERESTARTSYS;
> +
> + mutex_lock(&bt_bmc->mutex);
> +
> + if (unlikely(bt_inb(bt_bmc, BT_CTRL) &
> + (BT_CTRL_H_BUSY | BT_CTRL_B2H_ATN))) {
> + ret = -EIO;
> + goto out_unlock;
> + }
> +
> + clr_wr_ptr(bt_bmc);
> +
> + while (count) {
> + nwritten = min_t(ssize_t, count, sizeof(kbuffer));
> + if (copy_from_user(&kbuffer, buf, nwritten)) {
> + ret = -EFAULT;
> + break;
> + }
> +
> + bt_writen(bt_bmc, kbuffer, nwritten);
> +
> + count -= nwritten;
> + buf += nwritten;
> + ret += nwritten;
> + }
> +
> + set_b2h_atn(bt_bmc);
> +
> +out_unlock:
> + mutex_unlock(&bt_bmc->mutex);
> + return ret;
> +}
> +
> +static long bt_bmc_ioctl(struct file *file, unsigned int cmd,
> + unsigned long param)
> +{
> + struct bt_bmc *bt_bmc = file_bt_bmc(file);
> +
> + switch (cmd) {
> + case BT_BMC_IOCTL_SMS_ATN:
> + set_sms_atn(bt_bmc);
> + return 0;
> + }
> + return -EINVAL;
> +}
> +
> +static int bt_bmc_release(struct inode *inode, struct file *file)
> +{
> + struct bt_bmc *bt_bmc = file_bt_bmc(file);
> +
> + atomic_dec(&open_count);
> + set_b_busy(bt_bmc);
> + return 0;
> +}
> +
> +static unsigned int bt_bmc_poll(struct file *file, poll_table *wait)
> +{
> + struct bt_bmc *bt_bmc = file_bt_bmc(file);
> + unsigned int mask = 0;
> + u8 ctrl;
> +
> + poll_wait(file, &bt_bmc->queue, wait);
> +
> + ctrl = bt_inb(bt_bmc, BT_CTRL);
> +
> + if (ctrl & BT_CTRL_H2B_ATN)
> + mask |= POLLIN;
> +
> + if (!(ctrl & (BT_CTRL_H_BUSY | BT_CTRL_B2H_ATN)))
> + mask |= POLLOUT;
> +
> + return mask;
> +}
> +
> +static const struct file_operations bt_bmc_fops = {
> + .owner = THIS_MODULE,
> + .open = bt_bmc_open,
> + .read = bt_bmc_read,
> + .write = bt_bmc_write,
> + .release = bt_bmc_release,
> + .poll = bt_bmc_poll,
> + .unlocked_ioctl = bt_bmc_ioctl,
> +};
> +
> +static void poll_timer(unsigned long data)
> +{
> + struct bt_bmc *bt_bmc = (void *)data;
> +
> + bt_bmc->poll_timer.expires += msecs_to_jiffies(500);
> + wake_up(&bt_bmc->queue);
> + add_timer(&bt_bmc->poll_timer);
> +}
> +
> +static irqreturn_t bt_bmc_irq(int irq, void *arg)
> +{
> + struct bt_bmc *bt_bmc = arg;
> + u32 reg;
> +
> + reg = ioread32(bt_bmc->base + BT_CR2);
> + reg &= BT_CR2_IRQ_H2B | BT_CR2_IRQ_HBUSY;
> + if (!reg)
> + return IRQ_NONE;
> +
> + /* ack pending IRQs */
> + iowrite32(reg, bt_bmc->base + BT_CR2);
> +
> + wake_up(&bt_bmc->queue);
> + return IRQ_HANDLED;
> +}
> +
> +static int bt_bmc_config_irq(struct bt_bmc *bt_bmc,
> + struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + u32 reg;
> + int rc;
> +
> + bt_bmc->irq = platform_get_irq(pdev, 0);
> + if (!bt_bmc->irq)
> + return -ENODEV;
> +
> + rc = devm_request_irq(dev, bt_bmc->irq, bt_bmc_irq, IRQF_SHARED,
> + DEVICE_NAME, bt_bmc);
> + if (rc < 0) {
> + dev_warn(dev, "Unable to request IRQ %d\n", bt_bmc->irq);
> + bt_bmc->irq = 0;
> + return rc;
> + }
> +
> + /*
> + * Configure IRQs on the bmc clearing the H2B and HBUSY bits;
> + * H2B will be asserted when the bmc has data for us; HBUSY
> + * will be cleared (along with B2H) when we can write the next
> + * message to the BT buffer
> + */
> + reg = ioread32(bt_bmc->base + BT_CR1);
> + reg |= BT_CR1_IRQ_H2B | BT_CR1_IRQ_HBUSY;
> + iowrite32(reg, bt_bmc->base + BT_CR1);
> +
> + return 0;
> +}
> +
> +static int bt_bmc_probe(struct platform_device *pdev)
> +{
> + struct bt_bmc *bt_bmc;
> + struct device *dev;
> + struct resource *res;
> + int rc;
> +
> + if (!pdev || !pdev->dev.of_node)
> + return -ENODEV;
> +
> + dev = &pdev->dev;
> + dev_info(dev, "Found bt bmc device\n");
> +
> + bt_bmc = devm_kzalloc(dev, sizeof(*bt_bmc), GFP_KERNEL);
> + if (!bt_bmc)
> + return -ENOMEM;
> +
> + dev_set_drvdata(&pdev->dev, bt_bmc);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + bt_bmc->base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(bt_bmc->base))
> + return PTR_ERR(bt_bmc->base);
> +
> + mutex_init(&bt_bmc->mutex);
> + init_waitqueue_head(&bt_bmc->queue);
> +
> + bt_bmc->miscdev.minor = MISC_DYNAMIC_MINOR,
> + bt_bmc->miscdev.name = DEVICE_NAME,
> + bt_bmc->miscdev.fops = &bt_bmc_fops,
> + bt_bmc->miscdev.parent = dev;
> + rc = misc_register(&bt_bmc->miscdev);
> + if (rc) {
> + dev_err(dev, "Unable to register misc device\n");
> + return rc;
> + }
> +
> + bt_bmc_config_irq(bt_bmc, pdev);
> +
> + if (bt_bmc->irq) {
> + dev_info(dev, "Using IRQ %d\n", bt_bmc->irq);
> + } else {
> + dev_info(dev, "No IRQ; using timer\n");
> + setup_timer(&bt_bmc->poll_timer, poll_timer,
> + (unsigned long)bt_bmc);
> + bt_bmc->poll_timer.expires = jiffies + msecs_to_jiffies(10);
> + add_timer(&bt_bmc->poll_timer);
> + }
> +
> + iowrite32((BT_IO_BASE << BT_CR0_IO_BASE) |
> + (BT_IRQ << BT_CR0_IRQ) |
> + BT_CR0_EN_CLR_SLV_RDP |
> + BT_CR0_EN_CLR_SLV_WRP |
> + BT_CR0_ENABLE_IBT,
> + bt_bmc->base + BT_CR0);
> +
> + clr_b_busy(bt_bmc);
> +
> + return 0;
> +}
> +
> +static int bt_bmc_remove(struct platform_device *pdev)
> +{
> + struct bt_bmc *bt_bmc = dev_get_drvdata(&pdev->dev);
> +
> + misc_deregister(&bt_bmc->miscdev);
> + if (!bt_bmc->irq)
> + del_timer_sync(&bt_bmc->poll_timer);
> + return 0;
> +}
> +
> +static const struct of_device_id bt_bmc_match[] = {
> + { .compatible = "aspeed,ast2400-bt-bmc" },
> + { },
> +};
> +
> +static struct platform_driver bt_bmc_driver = {
> + .driver = {
> + .name = DEVICE_NAME,
> + .of_match_table = bt_bmc_match,
> + },
> + .probe = bt_bmc_probe,
> + .remove = bt_bmc_remove,
> +};
> +
> +module_platform_driver(bt_bmc_driver);
> +
> +MODULE_DEVICE_TABLE(of, bt_bmc_match);
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Alistair Popple <alistair at popple.id.au>");
> +MODULE_DESCRIPTION("Linux device interface to the BT interface");
> diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
> index ec10cfef166a..9493842de93b 100644
> --- a/include/uapi/linux/Kbuild
> +++ b/include/uapi/linux/Kbuild
> @@ -74,6 +74,7 @@ header-y += bpf_common.h
> header-y += bpf.h
> header-y += bpqether.h
> header-y += bsg.h
> +header-y += bt-bmc.h
> header-y += btrfs.h
> header-y += can.h
> header-y += capability.h
> diff --git a/include/uapi/linux/bt-bmc.h b/include/uapi/linux/bt-bmc.h
> new file mode 100644
> index 000000000000..d9ec766a63d0
> --- /dev/null
> +++ b/include/uapi/linux/bt-bmc.h
> @@ -0,0 +1,18 @@
> +/*
> + * Copyright (c) 2015-2016, IBM Corporation.
> + *
> + * 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.
> + */
> +
> +#ifndef _UAPI_LINUX_BT_BMC_H
> +#define _UAPI_LINUX_BT_BMC_H
> +
> +#include <linux/ioctl.h>
> +
> +#define __BT_BMC_IOCTL_MAGIC 0xb1
> +#define BT_BMC_IOCTL_SMS_ATN _IO(__BT_BMC_IOCTL_MAGIC, 0x00)
> +
> +#endif /* _UAPI_LINUX_BT_BMC_H */
> --
> 2.7.4
>
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