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Linux/drivers/input/misc/atlas_btns.c

  1 /*
  2  *  atlas_btns.c - Atlas Wallmount Touchscreen ACPI Extras
  3  *
  4  *  Copyright (C) 2006 Jaya Kumar
  5  *  Based on Toshiba ACPI by John Belmonte and ASUS ACPI
  6  *  This work was sponsored by CIS(M) Sdn Bhd.
  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
 11  *  (at your option) 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 21  *
 22  */
 23 
 24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 25 
 26 #include <linux/kernel.h>
 27 #include <linux/module.h>
 28 #include <linux/input.h>
 29 #include <linux/types.h>
 30 #include <linux/acpi.h>
 31 #include <asm/uaccess.h>
 32 
 33 #define ACPI_ATLAS_NAME         "Atlas ACPI"
 34 #define ACPI_ATLAS_CLASS        "Atlas"
 35 
 36 static unsigned short atlas_keymap[16];
 37 static struct input_dev *input_dev;
 38 
 39 /* button handling code */
 40 static acpi_status acpi_atlas_button_setup(acpi_handle region_handle,
 41                     u32 function, void *handler_context, void **return_context)
 42 {
 43         *return_context =
 44                 (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL;
 45 
 46         return AE_OK;
 47 }
 48 
 49 static acpi_status acpi_atlas_button_handler(u32 function,
 50                       acpi_physical_address address,
 51                       u32 bit_width, u64 *value,
 52                       void *handler_context, void *region_context)
 53 {
 54         acpi_status status;
 55 
 56         if (function == ACPI_WRITE) {
 57                 int code = address & 0x0f;
 58                 int key_down = !(address & 0x10);
 59 
 60                 input_event(input_dev, EV_MSC, MSC_SCAN, code);
 61                 input_report_key(input_dev, atlas_keymap[code], key_down);
 62                 input_sync(input_dev);
 63 
 64                 status = AE_OK;
 65         } else {
 66                 pr_warn("shrugged on unexpected function: function=%x,address=%lx,value=%x\n",
 67                         function, (unsigned long)address, (u32)*value);
 68                 status = AE_BAD_PARAMETER;
 69         }
 70 
 71         return status;
 72 }
 73 
 74 static int atlas_acpi_button_add(struct acpi_device *device)
 75 {
 76         acpi_status status;
 77         int i;
 78         int err;
 79 
 80         input_dev = input_allocate_device();
 81         if (!input_dev) {
 82                 pr_err("unable to allocate input device\n");
 83                 return -ENOMEM;
 84         }
 85 
 86         input_dev->name = "Atlas ACPI button driver";
 87         input_dev->phys = "ASIM0000/atlas/input0";
 88         input_dev->id.bustype = BUS_HOST;
 89         input_dev->keycode = atlas_keymap;
 90         input_dev->keycodesize = sizeof(unsigned short);
 91         input_dev->keycodemax = ARRAY_SIZE(atlas_keymap);
 92 
 93         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 94         __set_bit(EV_KEY, input_dev->evbit);
 95         for (i = 0; i < ARRAY_SIZE(atlas_keymap); i++) {
 96                 if (i < 9) {
 97                         atlas_keymap[i] = KEY_F1 + i;
 98                         __set_bit(KEY_F1 + i, input_dev->keybit);
 99                 } else
100                         atlas_keymap[i] = KEY_RESERVED;
101         }
102 
103         err = input_register_device(input_dev);
104         if (err) {
105                 pr_err("couldn't register input device\n");
106                 input_free_device(input_dev);
107                 return err;
108         }
109 
110         /* hookup button handler */
111         status = acpi_install_address_space_handler(device->handle,
112                                 0x81, &acpi_atlas_button_handler,
113                                 &acpi_atlas_button_setup, device);
114         if (ACPI_FAILURE(status)) {
115                 pr_err("error installing addr spc handler\n");
116                 input_unregister_device(input_dev);
117                 err = -EINVAL;
118         }
119 
120         return err;
121 }
122 
123 static int atlas_acpi_button_remove(struct acpi_device *device)
124 {
125         acpi_status status;
126 
127         status = acpi_remove_address_space_handler(device->handle,
128                                 0x81, &acpi_atlas_button_handler);
129         if (ACPI_FAILURE(status))
130                 pr_err("error removing addr spc handler\n");
131 
132         input_unregister_device(input_dev);
133 
134         return 0;
135 }
136 
137 static const struct acpi_device_id atlas_device_ids[] = {
138         {"ASIM0000", 0},
139         {"", 0},
140 };
141 MODULE_DEVICE_TABLE(acpi, atlas_device_ids);
142 
143 static struct acpi_driver atlas_acpi_driver = {
144         .name   = ACPI_ATLAS_NAME,
145         .class  = ACPI_ATLAS_CLASS,
146         .owner  = THIS_MODULE,
147         .ids    = atlas_device_ids,
148         .ops    = {
149                 .add    = atlas_acpi_button_add,
150                 .remove = atlas_acpi_button_remove,
151         },
152 };
153 module_acpi_driver(atlas_acpi_driver);
154 
155 MODULE_AUTHOR("Jaya Kumar");
156 MODULE_LICENSE("GPL");
157 MODULE_DESCRIPTION("Atlas button driver");
158 
159 

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