From: Alistair Popple <alist...@popple.id.au>

This patch adds a simple device driver to expose the iBT interface on
Aspeed SOCs (AST2400 and AST2500) as a character device. Such SOCs are
commonly used as BMCs (BaseBoard Management Controllers) and this
driver implements the BMC side of the BT interface.

The BT (Block Transfer) interface is used to perform in-band IPMI
communication between a host and its BMC. Entire messages are buffered
before sending a notification to the other end, host or BMC, that
there is data to be read. Usually, the host emits requests and the BMC
responses but the specification provides a mean for the BMC to send
SMS Attention (BMC-to-Host attention or System Management Software
attention) messages.

For this purpose, the driver introduces a specific ioctl on the
device: 'BT_BMC_IOCTL_SMS_ATN' that can be used by the system running
on the BMC to signal the host of such an event.

The device name defaults to '/dev/ipmi-bt-host'

Signed-off-by: Alistair Popple <alist...@popple.id.au>
Signed-off-by: Jeremy Kerr <j...@ozlabs.org>
Signed-off-by: Joel Stanley <j...@jms.id.au>
[clg: - checkpatch fixes
      - added a devicetree binding documentation
      - replace 'bt_host' by 'bt_bmc' to reflect that the driver is
        the BMC side of the IPMI BT interface
      - renamed the device to 'ipmi-bt-host'
      - introduced a temporary buffer to copy_{to,from}_user
      - used platform_get_irq()
      - moved the driver under drivers/char/ipmi/ but kept it as a misc
        device
      - changed the compatible cell to "aspeed,ast2400-bt-bmc"
]
Signed-off-by: Cédric Le Goater <c...@kaod.org>
Acked-by: Arnd Bergmann <a...@arndb.de>
[clg: - checkpatch --strict fixes
      - removed the use of devm_iounmap, devm_kfree in cleanup paths
      - introduced an atomic-t to limit opens to 1
      - introduced a mutex to protect write/read operations]
Signed-off-by: Cédric Le Goater <c...@kaod.org>

---

 Changes since v2:

 - fixed checkpatch --strict issues
 - cleanup'ed includes
 - limit to one opener
 - protect write/read operations with a mutex.
 - removed the use of devm_iounmap, devm_kfree in cleanup paths

 Changes since v1:

 - replace 'bt_host' by 'bt_bmc' to reflect that the driver is
   the BMC side of the IPMI BT interface
 - renamed the device to 'ipmi-bt-host'
 - introduced a temporary buffer to copy_{to,from}_user
 - used platform_get_irq()
 - moved the driver under drivers/char/ipmi/ but kept it as a misc
   device
 - changed the compatible cell to "aspeed,ast2400-bt-bmc"

 .../bindings/char/ipmi/aspeed,ast2400-bt-bmc.txt   |  23 +
 drivers/Makefile                                   |   2 +-
 drivers/char/ipmi/Kconfig                          |   7 +
 drivers/char/ipmi/Makefile                         |   1 +
 drivers/char/ipmi/bt-bmc.c                         | 510 +++++++++++++++++++++
 include/uapi/linux/Kbuild                          |   1 +
 include/uapi/linux/bt-bmc.h                        |  18 +
 7 files changed, 561 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@1e789140 {
+               compatible = "aspeed,ast2400-bt-bmc";
+               reg = <0x1e789140 0x18>;
+               interrupts = <8>;
+       };
diff --git a/drivers/Makefile b/drivers/Makefile
index 53abb4a5f736..5a9e7b6b7928 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 5a9350b1069a..2c234e3e7513 100644
--- a/drivers/char/ipmi/Kconfig
+++ b/drivers/char/ipmi/Kconfig
@@ -76,3 +76,10 @@ config IPMI_POWEROFF
         the IPMI management controller is capable of this.
 
 endif # IPMI_HANDLER
+
+config ASPEED_BT_IPMI_BMC
+       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..2e880bf0be26
--- /dev/null
+++ b/drivers/char/ipmi/bt-bmc.c
@@ -0,0 +1,510 @@
+/*
+ * 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);
+       if (!res) {
+               dev_err(dev, "Unable to find resources\n");
+               return -ENXIO;
+       }
+
+       bt_bmc->base = devm_ioremap_resource(&pdev->dev, res);
+       if (!bt_bmc->base)
+               return -ENOMEM;
+
+       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 <alist...@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 185f8ea2702f..17b12942c67d 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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