powerpc/cell: Add support for power button of future IBM cell blades
authorChristian Krafft <krafft@de.ibm.com>
Tue, 15 Jul 2008 19:51:45 +0000 (05:51 +1000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Tue, 22 Jul 2008 00:39:32 +0000 (10:39 +1000)
This patch adds support for the power button on future IBM cell blades.
It actually doesn't shut down the machine. Instead it exposes an
input device /dev/input/event0 to userspace which sends KEY_POWER
if power button has been pressed.
haldaemon actually recognizes the button, so a plattform independent acpid
replacement should handle it correctly.

Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
arch/powerpc/platforms/cell/Kconfig
arch/powerpc/platforms/cell/Makefile
arch/powerpc/platforms/cell/cbe_powerbutton.c [new file with mode: 0644]
include/asm-powerpc/pmi.h

index 2d1957bc450d414c907781a0d6d37baed55eda88..c14d7d8d96c853441a2bc6e4bbfac3b7753d558a 100644 (file)
@@ -91,6 +91,14 @@ config PPC_IBM_CELL_RESETBUTTON
          Support Pinhole Resetbutton on IBM Cell blades.
          This adds a method to trigger system reset via front panel pinhole button.
 
+config PPC_IBM_CELL_POWERBUTTON
+       tristate "IBM Cell Blade power button"
+       depends on PPC_IBM_CELL_BLADE && PPC_PMI && INPUT_EVDEV
+       default y
+       help
+         Support Powerbutton on IBM Cell blades.
+         This will enable the powerbutton as an input device.
+
 config CBE_THERM
        tristate "CBE thermal support"
        default m
index 7fcf09bd80b8eb29794d3e75ffdec2451a6c24b7..7fd830872c43bf458bd68de22ff9384c411bed19 100644 (file)
@@ -10,6 +10,8 @@ obj-$(CONFIG_CBE_CPUFREQ)             += cbe-cpufreq.o
 cbe-cpufreq-y                          += cbe_cpufreq_pervasive.o cbe_cpufreq.o
 obj-$(CONFIG_CBE_CPUFREQ_SPU_GOVERNOR) += cpufreq_spudemand.o
 
+obj-$(CONFIG_PPC_IBM_CELL_POWERBUTTON) += cbe_powerbutton.o
+
 ifeq ($(CONFIG_SMP),y)
 obj-$(CONFIG_PPC_CELL_NATIVE)          += smp.o
 endif
diff --git a/arch/powerpc/platforms/cell/cbe_powerbutton.c b/arch/powerpc/platforms/cell/cbe_powerbutton.c
new file mode 100644 (file)
index 0000000..dcddaa5
--- /dev/null
@@ -0,0 +1,117 @@
+/*
+ * driver for powerbutton on IBM cell blades
+ *
+ * (C) Copyright IBM Corp. 2005-2008
+ *
+ * Author: Christian Krafft <krafft@de.ibm.com>
+ *
+ * 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, 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.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <asm/pmi.h>
+#include <asm/prom.h>
+
+static struct input_dev *button_dev;
+static struct platform_device *button_pdev;
+
+static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)
+{
+       BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON);
+
+       input_report_key(button_dev, KEY_POWER, 1);
+       input_sync(button_dev);
+       input_report_key(button_dev, KEY_POWER, 0);
+       input_sync(button_dev);
+}
+
+static struct pmi_handler cbe_pmi_handler = {
+       .type                   = PMI_TYPE_POWER_BUTTON,
+       .handle_pmi_message     = cbe_powerbutton_handle_pmi,
+};
+
+static int __init cbe_powerbutton_init(void)
+{
+       int ret = 0;
+       struct input_dev *dev;
+
+       if (!machine_is_compatible("IBM,CBPLUS-1.0")) {
+               printk(KERN_ERR "%s: Not a cell blade.\n", __func__);
+               ret = -ENODEV;
+               goto out;
+       }
+
+       dev = input_allocate_device();
+       if (!dev) {
+               ret = -ENOMEM;
+               printk(KERN_ERR "%s: Not enough memory.\n", __func__);
+               goto out;
+       }
+
+       set_bit(EV_KEY, dev->evbit);
+       set_bit(KEY_POWER, dev->keybit);
+
+       dev->name = "Power Button";
+       dev->id.bustype = BUS_HOST;
+
+       /* this makes the button look like an acpi power button
+        * no clue whether anyone relies on that though */
+       dev->id.product = 0x02;
+       dev->phys = "LNXPWRBN/button/input0";
+
+       button_pdev = platform_device_register_simple("power_button", 0, NULL, 0);
+       if (IS_ERR(button_pdev)) {
+               ret = PTR_ERR(button_pdev);
+               goto out_free_input;
+       }
+
+       dev->dev.parent = &button_pdev->dev;
+       ret = input_register_device(dev);
+       if (ret) {
+               printk(KERN_ERR "%s: Failed to register device\n", __func__);
+               goto out_free_pdev;
+       }
+
+       button_dev = dev;
+
+       ret = pmi_register_handler(&cbe_pmi_handler);
+       if (ret) {
+               printk(KERN_ERR "%s: Failed to register with pmi.\n", __func__);
+               goto out_free_pdev;
+       }
+
+       goto out;
+
+out_free_pdev:
+       platform_device_unregister(button_pdev);
+out_free_input:
+       input_free_device(dev);
+out:
+       return ret;
+}
+
+static void __exit cbe_powerbutton_exit(void)
+{
+       pmi_unregister_handler(&cbe_pmi_handler);
+       platform_device_unregister(button_pdev);
+       input_free_device(button_dev);
+}
+
+module_init(cbe_powerbutton_init);
+module_exit(cbe_powerbutton_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
index e1dc090748dff7b3774197f2fb28d0b3fffb7747..b4e91fbf5081ab79533856a12f3370d42218499a 100644 (file)
@@ -30,6 +30,7 @@
 #ifdef __KERNEL__
 
 #define PMI_TYPE_FREQ_CHANGE   0x01
+#define PMI_TYPE_POWER_BUTTON  0x02
 #define PMI_READ_TYPE          0
 #define PMI_READ_DATA0         1
 #define PMI_READ_DATA1         2