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Linux/drivers/platform/x86/xo15-ebook.c

  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 
 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 15 
 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>
 21 #include <linux/acpi.h>
 22 
 23 #define MODULE_NAME "xo15-ebook"
 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 
 79 #ifdef CONFIG_PM_SLEEP
 80 static int ebook_switch_resume(struct device *dev)
 81 {
 82         return ebook_send_state(to_acpi_device(dev));
 83 }
 84 #endif
 85 
 86 static SIMPLE_DEV_PM_OPS(ebook_switch_pm, NULL, ebook_switch_resume);
 87 
 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)) {
112                 pr_err("Unsupported hid [%s]\n", hid);
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);
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 
152 static int ebook_switch_remove(struct acpi_device *device)
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,
167                 .remove = ebook_switch_remove,
168                 .notify = ebook_switch_notify,
169         },
170         .drv.pm = &ebook_switch_pm,
171 };
172 module_acpi_driver(xo15_ebook_driver);
173 

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