Carlos Corbacho | dd8cd77 | 2008-02-05 02:17:15 +0000 | [diff] [blame^] | 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 | #include <linux/kernel.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/types.h> |
| 32 | #include <acpi/acpi.h> |
| 33 | #include <acpi/actypes.h> |
| 34 | #include <acpi/acpi_bus.h> |
| 35 | #include <acpi/acpi_drivers.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 | #define TC1100_LOGPREFIX "tc1100-wmi: " |
| 44 | #define TC1100_INFO KERN_INFO TC1100_LOGPREFIX |
| 45 | |
| 46 | MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho"); |
| 47 | MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras"); |
| 48 | MODULE_LICENSE("GPL"); |
| 49 | MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505"); |
| 50 | |
| 51 | static int tc1100_probe(struct platform_device *device); |
| 52 | static int tc1100_remove(struct platform_device *device); |
| 53 | static int tc1100_suspend(struct platform_device *device, pm_message_t state); |
| 54 | static int tc1100_resume(struct platform_device *device); |
| 55 | |
| 56 | static struct platform_driver tc1100_driver = { |
| 57 | .driver = { |
| 58 | .name = "tc1100-wmi", |
| 59 | .owner = THIS_MODULE, |
| 60 | }, |
| 61 | .probe = tc1100_probe, |
| 62 | .remove = tc1100_remove, |
| 63 | .suspend = tc1100_suspend, |
| 64 | .resume = tc1100_resume, |
| 65 | }; |
| 66 | |
| 67 | static struct platform_device *tc1100_device; |
| 68 | |
| 69 | struct tc1100_data { |
| 70 | u32 wireless; |
| 71 | u32 jogdial; |
| 72 | }; |
| 73 | |
| 74 | static struct tc1100_data suspend_data; |
| 75 | |
| 76 | /* -------------------------------------------------------------------------- |
| 77 | Device Management |
| 78 | -------------------------------------------------------------------------- */ |
| 79 | |
| 80 | static int get_state(u32 *out, u8 instance) |
| 81 | { |
| 82 | u32 tmp; |
| 83 | acpi_status status; |
| 84 | struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 85 | union acpi_object *obj; |
| 86 | |
| 87 | if (!out) |
| 88 | return -EINVAL; |
| 89 | |
| 90 | if (instance > 2) |
| 91 | return -ENODEV; |
| 92 | |
| 93 | status = wmi_query_block(GUID, instance, &result); |
| 94 | if (ACPI_FAILURE(status)) |
| 95 | return -ENODEV; |
| 96 | |
| 97 | obj = (union acpi_object *) result.pointer; |
| 98 | if (obj && obj->type == ACPI_TYPE_BUFFER && |
| 99 | obj->buffer.length == sizeof(u32)) { |
| 100 | tmp = *((u32 *) obj->buffer.pointer); |
| 101 | } else { |
| 102 | tmp = 0; |
| 103 | } |
| 104 | |
| 105 | if (result.length > 0 && result.pointer) |
| 106 | kfree(result.pointer); |
| 107 | |
| 108 | switch (instance) { |
| 109 | case TC1100_INSTANCE_WIRELESS: |
| 110 | *out = (tmp == 3) ? 1 : 0; |
| 111 | return 0; |
| 112 | case TC1100_INSTANCE_JOGDIAL: |
| 113 | *out = (tmp == 1) ? 1 : 0; |
| 114 | return 0; |
| 115 | default: |
| 116 | return -ENODEV; |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | static int set_state(u32 *in, u8 instance) |
| 121 | { |
| 122 | u32 value; |
| 123 | acpi_status status; |
| 124 | struct acpi_buffer input; |
| 125 | |
| 126 | if (!in) |
| 127 | return -EINVAL; |
| 128 | |
| 129 | if (instance > 2) |
| 130 | return -ENODEV; |
| 131 | |
| 132 | switch (instance) { |
| 133 | case TC1100_INSTANCE_WIRELESS: |
| 134 | value = (*in) ? 1 : 2; |
| 135 | break; |
| 136 | case TC1100_INSTANCE_JOGDIAL: |
| 137 | value = (*in) ? 0 : 1; |
| 138 | break; |
| 139 | default: |
| 140 | return -ENODEV; |
| 141 | } |
| 142 | |
| 143 | input.length = sizeof(u32); |
| 144 | input.pointer = &value; |
| 145 | |
| 146 | status = wmi_set_block(GUID, instance, &input); |
| 147 | if (ACPI_FAILURE(status)) |
| 148 | return -ENODEV; |
| 149 | |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | /* -------------------------------------------------------------------------- |
| 154 | FS Interface (/sys) |
| 155 | -------------------------------------------------------------------------- */ |
| 156 | |
| 157 | /* |
| 158 | * Read/ write bool sysfs macro |
| 159 | */ |
| 160 | #define show_set_bool(value, instance) \ |
| 161 | static ssize_t \ |
| 162 | show_bool_##value(struct device *dev, struct device_attribute *attr, \ |
| 163 | char *buf) \ |
| 164 | { \ |
| 165 | u32 result; \ |
| 166 | acpi_status status = get_state(&result, instance); \ |
| 167 | if (ACPI_SUCCESS(status)) \ |
| 168 | return sprintf(buf, "%d\n", result); \ |
| 169 | return sprintf(buf, "Read error\n"); \ |
| 170 | } \ |
| 171 | \ |
| 172 | static ssize_t \ |
| 173 | set_bool_##value(struct device *dev, struct device_attribute *attr, \ |
| 174 | const char *buf, size_t count) \ |
| 175 | { \ |
| 176 | u32 tmp = simple_strtoul(buf, NULL, 10); \ |
| 177 | acpi_status status = set_state(&tmp, instance); \ |
| 178 | if (ACPI_FAILURE(status)) \ |
| 179 | return -EINVAL; \ |
| 180 | return count; \ |
| 181 | } \ |
| 182 | static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \ |
| 183 | show_bool_##value, set_bool_##value); |
| 184 | |
| 185 | show_set_bool(wireless, TC1100_INSTANCE_WIRELESS); |
| 186 | show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL); |
| 187 | |
| 188 | static void remove_fs(void) |
| 189 | { |
| 190 | device_remove_file(&tc1100_device->dev, &dev_attr_wireless); |
| 191 | device_remove_file(&tc1100_device->dev, &dev_attr_jogdial); |
| 192 | } |
| 193 | |
| 194 | static int add_fs(void) |
| 195 | { |
| 196 | int ret; |
| 197 | |
| 198 | ret = device_create_file(&tc1100_device->dev, &dev_attr_wireless); |
| 199 | if (ret) |
| 200 | goto add_sysfs_error; |
| 201 | |
| 202 | ret = device_create_file(&tc1100_device->dev, &dev_attr_jogdial); |
| 203 | if (ret) |
| 204 | goto add_sysfs_error; |
| 205 | |
| 206 | return ret; |
| 207 | |
| 208 | add_sysfs_error: |
| 209 | remove_fs(); |
| 210 | return ret; |
| 211 | } |
| 212 | |
| 213 | /* -------------------------------------------------------------------------- |
| 214 | Driver Model |
| 215 | -------------------------------------------------------------------------- */ |
| 216 | |
| 217 | static int tc1100_probe(struct platform_device *device) |
| 218 | { |
| 219 | int result = 0; |
| 220 | |
| 221 | result = add_fs(); |
| 222 | return result; |
| 223 | } |
| 224 | |
| 225 | |
| 226 | static int tc1100_remove(struct platform_device *device) |
| 227 | { |
| 228 | remove_fs(); |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static int tc1100_suspend(struct platform_device *dev, pm_message_t state) |
| 233 | { |
| 234 | int ret; |
| 235 | |
| 236 | ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS); |
| 237 | if (ret) |
| 238 | return ret; |
| 239 | |
| 240 | ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL); |
| 241 | if (ret) |
| 242 | return ret; |
| 243 | |
| 244 | return ret; |
| 245 | } |
| 246 | |
| 247 | static int tc1100_resume(struct platform_device *dev) |
| 248 | { |
| 249 | int ret; |
| 250 | |
| 251 | ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS); |
| 252 | if (ret) |
| 253 | return ret; |
| 254 | |
| 255 | ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL); |
| 256 | if (ret) |
| 257 | return ret; |
| 258 | |
| 259 | return ret; |
| 260 | } |
| 261 | |
| 262 | static int __init tc1100_init(void) |
| 263 | { |
| 264 | int result = 0; |
| 265 | |
| 266 | if (!wmi_has_guid(GUID)) |
| 267 | return -ENODEV; |
| 268 | |
| 269 | result = platform_driver_register(&tc1100_driver); |
| 270 | if (result) |
| 271 | return result; |
| 272 | |
| 273 | tc1100_device = platform_device_alloc("tc1100-wmi", -1); |
| 274 | platform_device_add(tc1100_device); |
| 275 | |
| 276 | printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n"); |
| 277 | |
| 278 | return result; |
| 279 | } |
| 280 | |
| 281 | static void __exit tc1100_exit(void) |
| 282 | { |
| 283 | platform_device_del(tc1100_device); |
| 284 | platform_driver_unregister(&tc1100_driver); |
| 285 | |
| 286 | printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras unloaded\n"); |
| 287 | } |
| 288 | |
| 289 | module_init(tc1100_init); |
| 290 | module_exit(tc1100_exit); |