Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * OLPC XO-1.5 ebook switch driver |
| 3 | * (based on generic ACPI button driver) |
| 4 | * |
| 5 | * Copyright (C) 2009 Paul Fox <pgf@laptop.org> |
| 6 | * Copyright (C) 2010 One Laptop per Child |
| 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 of the License, or (at |
| 11 | * your option) any later version. |
| 12 | */ |
| 13 | |
Joe Perches | ad3f2f0 | 2011-03-29 15:21:54 -0700 | [diff] [blame] | 14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 15 | |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/types.h> |
| 20 | #include <linux/input.h> |
Lv Zheng | 8b48463 | 2013-12-03 08:49:16 +0800 | [diff] [blame] | 21 | #include <linux/acpi.h> |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 22 | |
| 23 | #define MODULE_NAME "xo15-ebook" |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 24 | |
| 25 | #define XO15_EBOOK_CLASS MODULE_NAME |
| 26 | #define XO15_EBOOK_TYPE_UNKNOWN 0x00 |
| 27 | #define XO15_EBOOK_NOTIFY_STATUS 0x80 |
| 28 | |
| 29 | #define XO15_EBOOK_SUBCLASS "ebook" |
| 30 | #define XO15_EBOOK_HID "XO15EBK" |
| 31 | #define XO15_EBOOK_DEVICE_NAME "EBook Switch" |
| 32 | |
| 33 | ACPI_MODULE_NAME(MODULE_NAME); |
| 34 | |
| 35 | MODULE_DESCRIPTION("OLPC XO-1.5 ebook switch driver"); |
| 36 | MODULE_LICENSE("GPL"); |
| 37 | |
| 38 | static const struct acpi_device_id ebook_device_ids[] = { |
| 39 | { XO15_EBOOK_HID, 0 }, |
| 40 | { "", 0 }, |
| 41 | }; |
| 42 | MODULE_DEVICE_TABLE(acpi, ebook_device_ids); |
| 43 | |
| 44 | struct ebook_switch { |
| 45 | struct input_dev *input; |
| 46 | char phys[32]; /* for input device */ |
| 47 | }; |
| 48 | |
| 49 | static int ebook_send_state(struct acpi_device *device) |
| 50 | { |
| 51 | struct ebook_switch *button = acpi_driver_data(device); |
| 52 | unsigned long long state; |
| 53 | acpi_status status; |
| 54 | |
| 55 | status = acpi_evaluate_integer(device->handle, "EBK", NULL, &state); |
| 56 | if (ACPI_FAILURE(status)) |
| 57 | return -EIO; |
| 58 | |
| 59 | /* input layer checks if event is redundant */ |
| 60 | input_report_switch(button->input, SW_TABLET_MODE, !state); |
| 61 | input_sync(button->input); |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static void ebook_switch_notify(struct acpi_device *device, u32 event) |
| 66 | { |
| 67 | switch (event) { |
| 68 | case ACPI_FIXED_HARDWARE_EVENT: |
| 69 | case XO15_EBOOK_NOTIFY_STATUS: |
| 70 | ebook_send_state(device); |
| 71 | break; |
| 72 | default: |
| 73 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 74 | "Unsupported event [0x%x]\n", event)); |
| 75 | break; |
| 76 | } |
| 77 | } |
| 78 | |
Rafael J. Wysocki | 3567a4e2 | 2012-08-09 23:00:13 +0200 | [diff] [blame] | 79 | #ifdef CONFIG_PM_SLEEP |
Rafael J. Wysocki | 44cb98c | 2012-06-27 23:27:55 +0200 | [diff] [blame] | 80 | static int ebook_switch_resume(struct device *dev) |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 81 | { |
Rafael J. Wysocki | 44cb98c | 2012-06-27 23:27:55 +0200 | [diff] [blame] | 82 | return ebook_send_state(to_acpi_device(dev)); |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 83 | } |
Rafael J. Wysocki | 3567a4e2 | 2012-08-09 23:00:13 +0200 | [diff] [blame] | 84 | #endif |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 85 | |
Rafael J. Wysocki | 44cb98c | 2012-06-27 23:27:55 +0200 | [diff] [blame] | 86 | static SIMPLE_DEV_PM_OPS(ebook_switch_pm, NULL, ebook_switch_resume); |
| 87 | |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 88 | static int ebook_switch_add(struct acpi_device *device) |
| 89 | { |
| 90 | struct ebook_switch *button; |
| 91 | struct input_dev *input; |
| 92 | const char *hid = acpi_device_hid(device); |
| 93 | char *name, *class; |
| 94 | int error; |
| 95 | |
| 96 | button = kzalloc(sizeof(struct ebook_switch), GFP_KERNEL); |
| 97 | if (!button) |
| 98 | return -ENOMEM; |
| 99 | |
| 100 | device->driver_data = button; |
| 101 | |
| 102 | button->input = input = input_allocate_device(); |
| 103 | if (!input) { |
| 104 | error = -ENOMEM; |
| 105 | goto err_free_button; |
| 106 | } |
| 107 | |
| 108 | name = acpi_device_name(device); |
| 109 | class = acpi_device_class(device); |
| 110 | |
| 111 | if (strcmp(hid, XO15_EBOOK_HID)) { |
Joe Perches | ad3f2f0 | 2011-03-29 15:21:54 -0700 | [diff] [blame] | 112 | pr_err("Unsupported hid [%s]\n", hid); |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 113 | error = -ENODEV; |
| 114 | goto err_free_input; |
| 115 | } |
| 116 | |
| 117 | strcpy(name, XO15_EBOOK_DEVICE_NAME); |
| 118 | sprintf(class, "%s/%s", XO15_EBOOK_CLASS, XO15_EBOOK_SUBCLASS); |
| 119 | |
| 120 | snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid); |
| 121 | |
| 122 | input->name = name; |
| 123 | input->phys = button->phys; |
| 124 | input->id.bustype = BUS_HOST; |
| 125 | input->dev.parent = &device->dev; |
| 126 | |
| 127 | input->evbit[0] = BIT_MASK(EV_SW); |
| 128 | set_bit(SW_TABLET_MODE, input->swbit); |
| 129 | |
| 130 | error = input_register_device(input); |
| 131 | if (error) |
| 132 | goto err_free_input; |
| 133 | |
| 134 | ebook_send_state(device); |
| 135 | |
| 136 | if (device->wakeup.flags.valid) { |
| 137 | /* Button's GPE is run-wake GPE */ |
| 138 | acpi_enable_gpe(device->wakeup.gpe_device, |
| 139 | device->wakeup.gpe_number); |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 140 | device_set_wakeup_enable(&device->dev, true); |
| 141 | } |
| 142 | |
| 143 | return 0; |
| 144 | |
| 145 | err_free_input: |
| 146 | input_free_device(input); |
| 147 | err_free_button: |
| 148 | kfree(button); |
| 149 | return error; |
| 150 | } |
| 151 | |
Rafael J. Wysocki | 51fac83 | 2013-01-24 00:24:48 +0100 | [diff] [blame] | 152 | static int ebook_switch_remove(struct acpi_device *device) |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 153 | { |
| 154 | struct ebook_switch *button = acpi_driver_data(device); |
| 155 | |
| 156 | input_unregister_device(button->input); |
| 157 | kfree(button); |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | static struct acpi_driver xo15_ebook_driver = { |
| 162 | .name = MODULE_NAME, |
| 163 | .class = XO15_EBOOK_CLASS, |
| 164 | .ids = ebook_device_ids, |
| 165 | .ops = { |
| 166 | .add = ebook_switch_add, |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 167 | .remove = ebook_switch_remove, |
| 168 | .notify = ebook_switch_notify, |
| 169 | }, |
Rafael J. Wysocki | 44cb98c | 2012-06-27 23:27:55 +0200 | [diff] [blame] | 170 | .drv.pm = &ebook_switch_pm, |
Paul Fox | 89ca117 | 2011-02-03 16:27:55 +0000 | [diff] [blame] | 171 | }; |
Mika Westerberg | a509d22 | 2012-09-07 10:31:49 +0300 | [diff] [blame] | 172 | module_acpi_driver(xo15_ebook_driver); |