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Linux/drivers/platform/x86/tc1100-wmi.c

  1 /*
  2  *  HP Compaq TC1100 Tablet WMI Extras Driver
  3  *
  4  *  Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk>
  5  *  Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>
  6  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  7  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  8  *
  9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 10  *
 11  *  This program is free software; you can redistribute it and/or modify
 12  *  it under the terms of the GNU General Public License as published by
 13  *  the Free Software Foundation; either version 2 of the License, or (at
 14  *  your option) any later version.
 15  *
 16  *  This program is distributed in the hope that it will be useful, but
 17  *  WITHOUT ANY WARRANTY; without even the implied warranty of
 18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 19  *  General Public License for more details.
 20  *
 21  *  You should have received a copy of the GNU General Public License along
 22  *  with this program; if not, write to the Free Software Foundation, Inc.,
 23  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 24  *
 25  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 26  */
 27 
 28 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 29 
 30 #include <linux/kernel.h>
 31 #include <linux/module.h>
 32 #include <linux/slab.h>
 33 #include <linux/init.h>
 34 #include <linux/types.h>
 35 #include <linux/acpi.h>
 36 #include <linux/platform_device.h>
 37 
 38 #define GUID "C364AC71-36DB-495A-8494-B439D472A505"
 39 
 40 #define TC1100_INSTANCE_WIRELESS                1
 41 #define TC1100_INSTANCE_JOGDIAL         2
 42 
 43 MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
 44 MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
 45 MODULE_LICENSE("GPL");
 46 MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
 47 
 48 static struct platform_device *tc1100_device;
 49 
 50 struct tc1100_data {
 51         u32 wireless;
 52         u32 jogdial;
 53 };
 54 
 55 static struct tc1100_data suspend_data;
 56 
 57 /* --------------------------------------------------------------------------
 58                                 Device Management
 59    -------------------------------------------------------------------------- */
 60 
 61 static int get_state(u32 *out, u8 instance)
 62 {
 63         u32 tmp;
 64         acpi_status status;
 65         struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
 66         union acpi_object *obj;
 67 
 68         if (!out)
 69                 return -EINVAL;
 70 
 71         if (instance > 2)
 72                 return -ENODEV;
 73 
 74         status = wmi_query_block(GUID, instance, &result);
 75         if (ACPI_FAILURE(status))
 76                 return -ENODEV;
 77 
 78         obj = (union acpi_object *) result.pointer;
 79         if (obj && obj->type == ACPI_TYPE_INTEGER) {
 80                 tmp = obj->integer.value;
 81         } else {
 82                 tmp = 0;
 83         }
 84 
 85         if (result.length > 0 && result.pointer)
 86                 kfree(result.pointer);
 87 
 88         switch (instance) {
 89         case TC1100_INSTANCE_WIRELESS:
 90                 *out = (tmp == 3) ? 1 : 0;
 91                 return 0;
 92         case TC1100_INSTANCE_JOGDIAL:
 93                 *out = (tmp == 1) ? 0 : 1;
 94                 return 0;
 95         default:
 96                 return -ENODEV;
 97         }
 98 }
 99 
100 static int set_state(u32 *in, u8 instance)
101 {
102         u32 value;
103         acpi_status status;
104         struct acpi_buffer input;
105 
106         if (!in)
107                 return -EINVAL;
108 
109         if (instance > 2)
110                 return -ENODEV;
111 
112         switch (instance) {
113         case TC1100_INSTANCE_WIRELESS:
114                 value = (*in) ? 1 : 2;
115                 break;
116         case TC1100_INSTANCE_JOGDIAL:
117                 value = (*in) ? 0 : 1;
118                 break;
119         default:
120                 return -ENODEV;
121         }
122 
123         input.length = sizeof(u32);
124         input.pointer = &value;
125 
126         status = wmi_set_block(GUID, instance, &input);
127         if (ACPI_FAILURE(status))
128                 return -ENODEV;
129 
130         return 0;
131 }
132 
133 /* --------------------------------------------------------------------------
134                                 FS Interface (/sys)
135    -------------------------------------------------------------------------- */
136 
137 /*
138  * Read/ write bool sysfs macro
139  */
140 #define show_set_bool(value, instance) \
141 static ssize_t \
142 show_bool_##value(struct device *dev, struct device_attribute *attr, \
143         char *buf) \
144 { \
145         u32 result; \
146         acpi_status status = get_state(&result, instance); \
147         if (ACPI_SUCCESS(status)) \
148                 return sprintf(buf, "%d\n", result); \
149         return sprintf(buf, "Read error\n"); \
150 } \
151 \
152 static ssize_t \
153 set_bool_##value(struct device *dev, struct device_attribute *attr, \
154         const char *buf, size_t count) \
155 { \
156         u32 tmp = simple_strtoul(buf, NULL, 10); \
157         acpi_status status = set_state(&tmp, instance); \
158                 if (ACPI_FAILURE(status)) \
159                         return -EINVAL; \
160         return count; \
161 } \
162 static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
163         show_bool_##value, set_bool_##value);
164 
165 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
166 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
167 
168 static struct attribute *tc1100_attributes[] = {
169         &dev_attr_wireless.attr,
170         &dev_attr_jogdial.attr,
171         NULL
172 };
173 
174 static struct attribute_group tc1100_attribute_group = {
175         .attrs  = tc1100_attributes,
176 };
177 
178 /* --------------------------------------------------------------------------
179                                 Driver Model
180    -------------------------------------------------------------------------- */
181 
182 static int __init tc1100_probe(struct platform_device *device)
183 {
184         return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
185 }
186 
187 
188 static int tc1100_remove(struct platform_device *device)
189 {
190         sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
191 
192         return 0;
193 }
194 
195 #ifdef CONFIG_PM
196 static int tc1100_suspend(struct device *dev)
197 {
198         int ret;
199 
200         ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
201         if (ret)
202                 return ret;
203 
204         ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
205         if (ret)
206                 return ret;
207 
208         return 0;
209 }
210 
211 static int tc1100_resume(struct device *dev)
212 {
213         int ret;
214 
215         ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
216         if (ret)
217                 return ret;
218 
219         ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
220         if (ret)
221                 return ret;
222 
223         return 0;
224 }
225 
226 static const struct dev_pm_ops tc1100_pm_ops = {
227         .suspend        = tc1100_suspend,
228         .resume         = tc1100_resume,
229         .freeze         = tc1100_suspend,
230         .restore        = tc1100_resume,
231 };
232 #endif
233 
234 static struct platform_driver tc1100_driver = {
235         .driver = {
236                 .name = "tc1100-wmi",
237                 .owner = THIS_MODULE,
238 #ifdef CONFIG_PM
239                 .pm = &tc1100_pm_ops,
240 #endif
241         },
242         .remove = tc1100_remove,
243 };
244 
245 static int __init tc1100_init(void)
246 {
247         int error;
248 
249         if (!wmi_has_guid(GUID))
250                 return -ENODEV;
251 
252         tc1100_device = platform_device_alloc("tc1100-wmi", -1);
253         if (!tc1100_device)
254                 return -ENOMEM;
255 
256         error = platform_device_add(tc1100_device);
257         if (error)
258                 goto err_device_put;
259 
260         error = platform_driver_probe(&tc1100_driver, tc1100_probe);
261         if (error)
262                 goto err_device_del;
263 
264         pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");
265         return 0;
266 
267  err_device_del:
268         platform_device_del(tc1100_device);
269  err_device_put:
270         platform_device_put(tc1100_device);
271         return error;
272 }
273 
274 static void __exit tc1100_exit(void)
275 {
276         platform_device_unregister(tc1100_device);
277         platform_driver_unregister(&tc1100_driver);
278 }
279 
280 module_init(tc1100_init);
281 module_exit(tc1100_exit);
282 

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