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Linux/drivers/platform/x86/topstar-laptop.c

  1 /*
  2  * ACPI driver for Topstar notebooks (hotkeys support only)
  3  *
  4  * Copyright (c) 2009 Herton Ronaldo Krzesinski <herton@mandriva.com.br>
  5  *
  6  * Implementation inspired by existing x86 platform drivers, in special
  7  * asus/eepc/fujitsu-laptop, thanks to their authors
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 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/slab.h>
 20 #include <linux/acpi.h>
 21 #include <linux/input.h>
 22 #include <linux/input/sparse-keymap.h>
 23 
 24 #define ACPI_TOPSTAR_CLASS "topstar"
 25 
 26 struct topstar_hkey {
 27         struct input_dev *inputdev;
 28 };
 29 
 30 static const struct key_entry topstar_keymap[] = {
 31         { KE_KEY, 0x80, { KEY_BRIGHTNESSUP } },
 32         { KE_KEY, 0x81, { KEY_BRIGHTNESSDOWN } },
 33         { KE_KEY, 0x83, { KEY_VOLUMEUP } },
 34         { KE_KEY, 0x84, { KEY_VOLUMEDOWN } },
 35         { KE_KEY, 0x85, { KEY_MUTE } },
 36         { KE_KEY, 0x86, { KEY_SWITCHVIDEOMODE } },
 37         { KE_KEY, 0x87, { KEY_F13 } }, /* touchpad enable/disable key */
 38         { KE_KEY, 0x88, { KEY_WLAN } },
 39         { KE_KEY, 0x8a, { KEY_WWW } },
 40         { KE_KEY, 0x8b, { KEY_MAIL } },
 41         { KE_KEY, 0x8c, { KEY_MEDIA } },
 42 
 43         /* Known non hotkey events don't handled or that we don't care yet */
 44         { KE_IGNORE, 0x82, }, /* backlight event */
 45         { KE_IGNORE, 0x8e, },
 46         { KE_IGNORE, 0x8f, },
 47         { KE_IGNORE, 0x90, },
 48 
 49         /*
 50          * 'G key' generate two event codes, convert to only
 51          * one event/key code for now, consider replacing by
 52          * a switch (3G switch - SW_3G?)
 53          */
 54         { KE_KEY, 0x96, { KEY_F14 } },
 55         { KE_KEY, 0x97, { KEY_F14 } },
 56 
 57         { KE_END, 0 }
 58 };
 59 
 60 static void acpi_topstar_notify(struct acpi_device *device, u32 event)
 61 {
 62         static bool dup_evnt[2];
 63         bool *dup;
 64         struct topstar_hkey *hkey = acpi_driver_data(device);
 65 
 66         /* 0x83 and 0x84 key events comes duplicated... */
 67         if (event == 0x83 || event == 0x84) {
 68                 dup = &dup_evnt[event - 0x83];
 69                 if (*dup) {
 70                         *dup = false;
 71                         return;
 72                 }
 73                 *dup = true;
 74         }
 75 
 76         if (!sparse_keymap_report_event(hkey->inputdev, event, 1, true))
 77                 pr_info("unknown event = 0x%02x\n", event);
 78 }
 79 
 80 static int acpi_topstar_fncx_switch(struct acpi_device *device, bool state)
 81 {
 82         acpi_status status;
 83 
 84         status = acpi_execute_simple_method(device->handle, "FNCX",
 85                                                 state ? 0x86 : 0x87);
 86         if (ACPI_FAILURE(status)) {
 87                 pr_err("Unable to switch FNCX notifications\n");
 88                 return -ENODEV;
 89         }
 90 
 91         return 0;
 92 }
 93 
 94 static int acpi_topstar_init_hkey(struct topstar_hkey *hkey)
 95 {
 96         struct input_dev *input;
 97         int error;
 98 
 99         input = input_allocate_device();
100         if (!input)
101                 return -ENOMEM;
102 
103         input->name = "Topstar Laptop extra buttons";
104         input->phys = "topstar/input0";
105         input->id.bustype = BUS_HOST;
106 
107         error = sparse_keymap_setup(input, topstar_keymap, NULL);
108         if (error) {
109                 pr_err("Unable to setup input device keymap\n");
110                 goto err_free_dev;
111         }
112 
113         error = input_register_device(input);
114         if (error) {
115                 pr_err("Unable to register input device\n");
116                 goto err_free_keymap;
117         }
118 
119         hkey->inputdev = input;
120         return 0;
121 
122  err_free_keymap:
123         sparse_keymap_free(input);
124  err_free_dev:
125         input_free_device(input);
126         return error;
127 }
128 
129 static int acpi_topstar_add(struct acpi_device *device)
130 {
131         struct topstar_hkey *tps_hkey;
132 
133         tps_hkey = kzalloc(sizeof(struct topstar_hkey), GFP_KERNEL);
134         if (!tps_hkey)
135                 return -ENOMEM;
136 
137         strcpy(acpi_device_name(device), "Topstar TPSACPI");
138         strcpy(acpi_device_class(device), ACPI_TOPSTAR_CLASS);
139 
140         if (acpi_topstar_fncx_switch(device, true))
141                 goto add_err;
142 
143         if (acpi_topstar_init_hkey(tps_hkey))
144                 goto add_err;
145 
146         device->driver_data = tps_hkey;
147         return 0;
148 
149 add_err:
150         kfree(tps_hkey);
151         return -ENODEV;
152 }
153 
154 static int acpi_topstar_remove(struct acpi_device *device)
155 {
156         struct topstar_hkey *tps_hkey = acpi_driver_data(device);
157 
158         acpi_topstar_fncx_switch(device, false);
159 
160         sparse_keymap_free(tps_hkey->inputdev);
161         input_unregister_device(tps_hkey->inputdev);
162         kfree(tps_hkey);
163 
164         return 0;
165 }
166 
167 static const struct acpi_device_id topstar_device_ids[] = {
168         { "TPSACPI01", 0 },
169         { "", 0 },
170 };
171 MODULE_DEVICE_TABLE(acpi, topstar_device_ids);
172 
173 static struct acpi_driver acpi_topstar_driver = {
174         .name = "Topstar laptop ACPI driver",
175         .class = ACPI_TOPSTAR_CLASS,
176         .ids = topstar_device_ids,
177         .ops = {
178                 .add = acpi_topstar_add,
179                 .remove = acpi_topstar_remove,
180                 .notify = acpi_topstar_notify,
181         },
182 };
183 module_acpi_driver(acpi_topstar_driver);
184 
185 MODULE_AUTHOR("Herton Ronaldo Krzesinski");
186 MODULE_DESCRIPTION("Topstar Laptop ACPI Extras driver");
187 MODULE_LICENSE("GPL");
188 

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