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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * HP Compaq TC1100 Tablet WMI Extras Driver4 *5 * Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk>6 * Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>9 */10 11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt12 13#include <linux/kernel.h>14#include <linux/module.h>15#include <linux/slab.h>16#include <linux/init.h>17#include <linux/types.h>18#include <linux/acpi.h>19#include <linux/platform_device.h>20 21#define GUID "C364AC71-36DB-495A-8494-B439D472A505"22 23#define TC1100_INSTANCE_WIRELESS 124#define TC1100_INSTANCE_JOGDIAL 225 26MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");27MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");28MODULE_LICENSE("GPL");29MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");30 31static struct platform_device *tc1100_device;32 33struct tc1100_data {34 u32 wireless;35 u32 jogdial;36};37 38#ifdef CONFIG_PM39static struct tc1100_data suspend_data;40#endif41 42/* --------------------------------------------------------------------------43 Device Management44 -------------------------------------------------------------------------- */45 46static int get_state(u32 *out, u8 instance)47{48 u32 tmp;49 acpi_status status;50 struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };51 union acpi_object *obj;52 53 if (!out)54 return -EINVAL;55 56 if (instance > 2)57 return -ENODEV;58 59 status = wmi_query_block(GUID, instance, &result);60 if (ACPI_FAILURE(status))61 return -ENODEV;62 63 obj = (union acpi_object *) result.pointer;64 if (obj && obj->type == ACPI_TYPE_INTEGER) {65 tmp = obj->integer.value;66 } else {67 tmp = 0;68 }69 70 if (result.length > 0)71 kfree(result.pointer);72 73 switch (instance) {74 case TC1100_INSTANCE_WIRELESS:75 *out = (tmp == 3) ? 1 : 0;76 return 0;77 case TC1100_INSTANCE_JOGDIAL:78 *out = (tmp == 1) ? 0 : 1;79 return 0;80 default:81 return -ENODEV;82 }83}84 85static int set_state(u32 *in, u8 instance)86{87 u32 value;88 acpi_status status;89 struct acpi_buffer input;90 91 if (!in)92 return -EINVAL;93 94 if (instance > 2)95 return -ENODEV;96 97 switch (instance) {98 case TC1100_INSTANCE_WIRELESS:99 value = (*in) ? 1 : 2;100 break;101 case TC1100_INSTANCE_JOGDIAL:102 value = (*in) ? 0 : 1;103 break;104 default:105 return -ENODEV;106 }107 108 input.length = sizeof(u32);109 input.pointer = &value;110 111 status = wmi_set_block(GUID, instance, &input);112 if (ACPI_FAILURE(status))113 return -ENODEV;114 115 return 0;116}117 118/* --------------------------------------------------------------------------119 FS Interface (/sys)120 -------------------------------------------------------------------------- */121 122/*123 * Read/ write bool sysfs macro124 */125#define show_set_bool(value, instance) \126static ssize_t \127show_bool_##value(struct device *dev, struct device_attribute *attr, \128 char *buf) \129{ \130 u32 result; \131 acpi_status status = get_state(&result, instance); \132 if (ACPI_SUCCESS(status)) \133 return sprintf(buf, "%d\n", result); \134 return sprintf(buf, "Read error\n"); \135} \136\137static ssize_t \138set_bool_##value(struct device *dev, struct device_attribute *attr, \139 const char *buf, size_t count) \140{ \141 u32 tmp = simple_strtoul(buf, NULL, 10); \142 acpi_status status = set_state(&tmp, instance); \143 if (ACPI_FAILURE(status)) \144 return -EINVAL; \145 return count; \146} \147static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \148 show_bool_##value, set_bool_##value);149 150show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);151show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);152 153static struct attribute *tc1100_attributes[] = {154 &dev_attr_wireless.attr,155 &dev_attr_jogdial.attr,156 NULL157};158 159static const struct attribute_group tc1100_attribute_group = {160 .attrs = tc1100_attributes,161};162 163/* --------------------------------------------------------------------------164 Driver Model165 -------------------------------------------------------------------------- */166 167static int __init tc1100_probe(struct platform_device *device)168{169 return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);170}171 172 173static void tc1100_remove(struct platform_device *device)174{175 sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);176}177 178#ifdef CONFIG_PM179static int tc1100_suspend(struct device *dev)180{181 int ret;182 183 ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);184 if (ret)185 return ret;186 187 ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);188 if (ret)189 return ret;190 191 return 0;192}193 194static int tc1100_resume(struct device *dev)195{196 int ret;197 198 ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);199 if (ret)200 return ret;201 202 ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);203 if (ret)204 return ret;205 206 return 0;207}208 209static const struct dev_pm_ops tc1100_pm_ops = {210 .suspend = tc1100_suspend,211 .resume = tc1100_resume,212 .freeze = tc1100_suspend,213 .restore = tc1100_resume,214};215#endif216 217static struct platform_driver tc1100_driver = {218 .driver = {219 .name = "tc1100-wmi",220#ifdef CONFIG_PM221 .pm = &tc1100_pm_ops,222#endif223 },224 .remove_new = tc1100_remove,225};226 227static int __init tc1100_init(void)228{229 int error;230 231 if (!wmi_has_guid(GUID))232 return -ENODEV;233 234 tc1100_device = platform_device_alloc("tc1100-wmi", PLATFORM_DEVID_NONE);235 if (!tc1100_device)236 return -ENOMEM;237 238 error = platform_device_add(tc1100_device);239 if (error)240 goto err_device_put;241 242 error = platform_driver_probe(&tc1100_driver, tc1100_probe);243 if (error)244 goto err_device_del;245 246 pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");247 return 0;248 249 err_device_del:250 platform_device_del(tc1100_device);251 err_device_put:252 platform_device_put(tc1100_device);253 return error;254}255 256static void __exit tc1100_exit(void)257{258 platform_device_unregister(tc1100_device);259 platform_driver_unregister(&tc1100_driver);260}261 262module_init(tc1100_init);263module_exit(tc1100_exit);264