| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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| 2 | /* |
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| 3 | * driver for powerbutton on IBM cell blades |
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| 4 | * |
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| 5 | * (C) Copyright IBM Corp. 2005-2008 |
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| 6 | * |
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| 7 | * Author: Christian Krafft <krafft@de.ibm.com> |
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| 8 | */ |
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| 9 | |
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| 10 | #include <linux/input.h> |
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| 11 | #include <linux/module.h> |
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| 12 | #include <linux/of.h> |
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| 13 | #include <linux/platform_device.h> |
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| 14 | #include <asm/pmi.h> |
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| 15 | |
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| 16 | static struct input_dev *button_dev; |
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| 17 | static struct platform_device *button_pdev; |
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| 18 | |
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| 19 | static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg) |
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| 20 | { |
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| 21 | BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON); |
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| 22 | |
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| 23 | input_report_key(dev: button_dev, KEY_POWER, value: 1); |
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| 24 | input_sync(dev: button_dev); |
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| 25 | input_report_key(dev: button_dev, KEY_POWER, value: 0); |
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| 26 | input_sync(dev: button_dev); |
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| 27 | } |
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| 28 | |
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| 29 | static struct pmi_handler cbe_pmi_handler = { |
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| 30 | .type = PMI_TYPE_POWER_BUTTON, |
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| 31 | .handle_pmi_message = cbe_powerbutton_handle_pmi, |
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| 32 | }; |
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| 33 | |
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| 34 | static int __init cbe_powerbutton_init(void) |
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| 35 | { |
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| 36 | int ret = 0; |
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| 37 | struct input_dev *dev; |
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| 38 | |
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| 39 | if (!of_machine_is_compatible(compat: "IBM,CBPLUS-1.0" )) { |
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| 40 | printk(KERN_ERR "%s: Not a cell blade.\n" , __func__); |
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| 41 | ret = -ENODEV; |
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| 42 | goto out; |
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| 43 | } |
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| 44 | |
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| 45 | dev = input_allocate_device(); |
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| 46 | if (!dev) { |
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| 47 | ret = -ENOMEM; |
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| 48 | printk(KERN_ERR "%s: Not enough memory.\n" , __func__); |
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| 49 | goto out; |
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| 50 | } |
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| 51 | |
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| 52 | set_bit(EV_KEY, addr: dev->evbit); |
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| 53 | set_bit(KEY_POWER, addr: dev->keybit); |
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| 54 | |
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| 55 | dev->name = "Power Button" ; |
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| 56 | dev->id.bustype = BUS_HOST; |
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| 57 | |
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| 58 | /* this makes the button look like an acpi power button |
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| 59 | * no clue whether anyone relies on that though */ |
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| 60 | dev->id.product = 0x02; |
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| 61 | dev->phys = "LNXPWRBN/button/input0" ; |
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| 62 | |
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| 63 | button_pdev = platform_device_register_simple(name: "power_button" , id: 0, NULL, num: 0); |
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| 64 | if (IS_ERR(ptr: button_pdev)) { |
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| 65 | ret = PTR_ERR(ptr: button_pdev); |
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| 66 | goto out_free_input; |
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| 67 | } |
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| 68 | |
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| 69 | dev->dev.parent = &button_pdev->dev; |
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| 70 | ret = input_register_device(dev); |
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| 71 | if (ret) { |
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| 72 | printk(KERN_ERR "%s: Failed to register device\n" , __func__); |
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| 73 | goto out_free_pdev; |
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| 74 | } |
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| 75 | |
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| 76 | button_dev = dev; |
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| 77 | |
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| 78 | ret = pmi_register_handler(&cbe_pmi_handler); |
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| 79 | if (ret) { |
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| 80 | printk(KERN_ERR "%s: Failed to register with pmi.\n" , __func__); |
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| 81 | goto out_free_pdev; |
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| 82 | } |
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| 83 | |
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| 84 | goto out; |
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| 85 | |
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| 86 | out_free_pdev: |
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| 87 | platform_device_unregister(button_pdev); |
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| 88 | out_free_input: |
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| 89 | input_free_device(dev); |
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| 90 | out: |
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| 91 | return ret; |
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| 92 | } |
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| 93 | |
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| 94 | static void __exit cbe_powerbutton_exit(void) |
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| 95 | { |
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| 96 | pmi_unregister_handler(&cbe_pmi_handler); |
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| 97 | platform_device_unregister(button_pdev); |
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| 98 | input_free_device(dev: button_dev); |
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| 99 | } |
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| 100 | |
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| 101 | module_init(cbe_powerbutton_init); |
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| 102 | module_exit(cbe_powerbutton_exit); |
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| 103 | |
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| 104 | MODULE_LICENSE("GPL" ); |
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| 105 | MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>" ); |
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| 106 | |
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