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 43MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho"); 44MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras"); 45MODULE_LICENSE("GPL"); 46MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505"); 47 48static struct platform_device *tc1100_device; 49 50struct tc1100_data { 51 u32 wireless; 52 u32 jogdial; 53}; 54 55static struct tc1100_data suspend_data; 56 57/* -------------------------------------------------------------------------- 58 Device Management 59 -------------------------------------------------------------------------- */ 60 61static 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 100static 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) \ 141static ssize_t \ 142show_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\ 152static ssize_t \ 153set_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} \ 162static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \ 163 show_bool_##value, set_bool_##value); 164 165show_set_bool(wireless, TC1100_INSTANCE_WIRELESS); 166show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL); 167 168static struct attribute *tc1100_attributes[] = { 169 &dev_attr_wireless.attr, 170 &dev_attr_jogdial.attr, 171 NULL 172}; 173 174static struct attribute_group tc1100_attribute_group = { 175 .attrs = tc1100_attributes, 176}; 177 178/* -------------------------------------------------------------------------- 179 Driver Model 180 -------------------------------------------------------------------------- */ 181 182static int __init tc1100_probe(struct platform_device *device) 183{ 184 return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group); 185} 186 187 188static 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 196static 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 211static 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 226static 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 234static struct platform_driver tc1100_driver = { 235 .driver = { 236 .name = "tc1100-wmi", 237#ifdef CONFIG_PM 238 .pm = &tc1100_pm_ops, 239#endif 240 }, 241 .remove = tc1100_remove, 242}; 243 244static int __init tc1100_init(void) 245{ 246 int error; 247 248 if (!wmi_has_guid(GUID)) 249 return -ENODEV; 250 251 tc1100_device = platform_device_alloc("tc1100-wmi", -1); 252 if (!tc1100_device) 253 return -ENOMEM; 254 255 error = platform_device_add(tc1100_device); 256 if (error) 257 goto err_device_put; 258 259 error = platform_driver_probe(&tc1100_driver, tc1100_probe); 260 if (error) 261 goto err_device_del; 262 263 pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n"); 264 return 0; 265 266 err_device_del: 267 platform_device_del(tc1100_device); 268 err_device_put: 269 platform_device_put(tc1100_device); 270 return error; 271} 272 273static void __exit tc1100_exit(void) 274{ 275 platform_device_unregister(tc1100_device); 276 platform_driver_unregister(&tc1100_driver); 277} 278 279module_init(tc1100_init); 280module_exit(tc1100_exit); 281