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https://github.com/edk2-porting/linux-next.git
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4795b7801b
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>
118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/*
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* driver for powerbutton on IBM cell blades
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*
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* (C) Copyright IBM Corp. 2005-2008
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*
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* Author: Christian Krafft <krafft@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <asm/pmi.h>
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#include <asm/prom.h>
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static struct input_dev *button_dev;
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static struct platform_device *button_pdev;
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static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)
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{
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BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON);
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input_report_key(button_dev, KEY_POWER, 1);
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input_sync(button_dev);
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input_report_key(button_dev, KEY_POWER, 0);
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input_sync(button_dev);
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}
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static struct pmi_handler cbe_pmi_handler = {
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.type = PMI_TYPE_POWER_BUTTON,
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.handle_pmi_message = cbe_powerbutton_handle_pmi,
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};
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static int __init cbe_powerbutton_init(void)
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{
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int ret = 0;
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struct input_dev *dev;
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if (!machine_is_compatible("IBM,CBPLUS-1.0")) {
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printk(KERN_ERR "%s: Not a cell blade.\n", __func__);
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ret = -ENODEV;
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goto out;
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}
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dev = input_allocate_device();
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if (!dev) {
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ret = -ENOMEM;
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printk(KERN_ERR "%s: Not enough memory.\n", __func__);
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goto out;
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}
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set_bit(EV_KEY, dev->evbit);
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set_bit(KEY_POWER, dev->keybit);
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dev->name = "Power Button";
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dev->id.bustype = BUS_HOST;
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/* this makes the button look like an acpi power button
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* no clue whether anyone relies on that though */
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dev->id.product = 0x02;
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dev->phys = "LNXPWRBN/button/input0";
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button_pdev = platform_device_register_simple("power_button", 0, NULL, 0);
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if (IS_ERR(button_pdev)) {
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ret = PTR_ERR(button_pdev);
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goto out_free_input;
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}
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dev->dev.parent = &button_pdev->dev;
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ret = input_register_device(dev);
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if (ret) {
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printk(KERN_ERR "%s: Failed to register device\n", __func__);
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goto out_free_pdev;
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}
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button_dev = dev;
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ret = pmi_register_handler(&cbe_pmi_handler);
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if (ret) {
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printk(KERN_ERR "%s: Failed to register with pmi.\n", __func__);
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goto out_free_pdev;
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}
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goto out;
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out_free_pdev:
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platform_device_unregister(button_pdev);
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out_free_input:
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input_free_device(dev);
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out:
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return ret;
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}
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static void __exit cbe_powerbutton_exit(void)
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{
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pmi_unregister_handler(&cbe_pmi_handler);
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platform_device_unregister(button_pdev);
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input_free_device(button_dev);
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}
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module_init(cbe_powerbutton_init);
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module_exit(cbe_powerbutton_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
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