Christian Krafft | 4795b78 | 2008-07-16 05:51:45 +1000 | [diff] [blame] | 1 | /* |
| 2 | * driver for powerbutton on IBM cell blades |
| 3 | * |
| 4 | * (C) Copyright IBM Corp. 2005-2008 |
| 5 | * |
| 6 | * Author: Christian Krafft <krafft@de.ibm.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2, or (at your option) |
| 11 | * any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/input.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <asm/pmi.h> |
| 26 | #include <asm/prom.h> |
| 27 | |
| 28 | static struct input_dev *button_dev; |
| 29 | static struct platform_device *button_pdev; |
| 30 | |
| 31 | static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg) |
| 32 | { |
| 33 | BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON); |
| 34 | |
| 35 | input_report_key(button_dev, KEY_POWER, 1); |
| 36 | input_sync(button_dev); |
| 37 | input_report_key(button_dev, KEY_POWER, 0); |
| 38 | input_sync(button_dev); |
| 39 | } |
| 40 | |
| 41 | static struct pmi_handler cbe_pmi_handler = { |
| 42 | .type = PMI_TYPE_POWER_BUTTON, |
| 43 | .handle_pmi_message = cbe_powerbutton_handle_pmi, |
| 44 | }; |
| 45 | |
| 46 | static int __init cbe_powerbutton_init(void) |
| 47 | { |
| 48 | int ret = 0; |
| 49 | struct input_dev *dev; |
| 50 | |
| 51 | if (!machine_is_compatible("IBM,CBPLUS-1.0")) { |
| 52 | printk(KERN_ERR "%s: Not a cell blade.\n", __func__); |
| 53 | ret = -ENODEV; |
| 54 | goto out; |
| 55 | } |
| 56 | |
| 57 | dev = input_allocate_device(); |
| 58 | if (!dev) { |
| 59 | ret = -ENOMEM; |
| 60 | printk(KERN_ERR "%s: Not enough memory.\n", __func__); |
| 61 | goto out; |
| 62 | } |
| 63 | |
| 64 | set_bit(EV_KEY, dev->evbit); |
| 65 | set_bit(KEY_POWER, dev->keybit); |
| 66 | |
| 67 | dev->name = "Power Button"; |
| 68 | dev->id.bustype = BUS_HOST; |
| 69 | |
| 70 | /* this makes the button look like an acpi power button |
| 71 | * no clue whether anyone relies on that though */ |
| 72 | dev->id.product = 0x02; |
| 73 | dev->phys = "LNXPWRBN/button/input0"; |
| 74 | |
| 75 | button_pdev = platform_device_register_simple("power_button", 0, NULL, 0); |
| 76 | if (IS_ERR(button_pdev)) { |
| 77 | ret = PTR_ERR(button_pdev); |
| 78 | goto out_free_input; |
| 79 | } |
| 80 | |
| 81 | dev->dev.parent = &button_pdev->dev; |
| 82 | ret = input_register_device(dev); |
| 83 | if (ret) { |
| 84 | printk(KERN_ERR "%s: Failed to register device\n", __func__); |
| 85 | goto out_free_pdev; |
| 86 | } |
| 87 | |
| 88 | button_dev = dev; |
| 89 | |
| 90 | ret = pmi_register_handler(&cbe_pmi_handler); |
| 91 | if (ret) { |
| 92 | printk(KERN_ERR "%s: Failed to register with pmi.\n", __func__); |
| 93 | goto out_free_pdev; |
| 94 | } |
| 95 | |
| 96 | goto out; |
| 97 | |
| 98 | out_free_pdev: |
| 99 | platform_device_unregister(button_pdev); |
| 100 | out_free_input: |
| 101 | input_free_device(dev); |
| 102 | out: |
| 103 | return ret; |
| 104 | } |
| 105 | |
| 106 | static void __exit cbe_powerbutton_exit(void) |
| 107 | { |
| 108 | pmi_unregister_handler(&cbe_pmi_handler); |
| 109 | platform_device_unregister(button_pdev); |
| 110 | input_free_device(button_dev); |
| 111 | } |
| 112 | |
| 113 | module_init(cbe_powerbutton_init); |
| 114 | module_exit(cbe_powerbutton_exit); |
| 115 | |
| 116 | MODULE_LICENSE("GPL"); |
| 117 | MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>"); |