/* * HP Compaq TC1100 Tablet WMI Extras Driver * * Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk> * Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com> * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <acpi/acpi.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #include <linux/platform_device.h> #define GUID "C364AC71-36DB-495A-8494-B439D472A505" #define TC1100_INSTANCE_WIRELESS 1 #define TC1100_INSTANCE_JOGDIAL 2 #define TC1100_LOGPREFIX "tc1100-wmi: " #define TC1100_INFO KERN_INFO TC1100_LOGPREFIX MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho"); MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras"); MODULE_LICENSE("GPL"); MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505"); static struct platform_device *tc1100_device; struct tc1100_data { u32 wireless; u32 jogdial; }; static struct tc1100_data suspend_data; /* -------------------------------------------------------------------------- Device Management -------------------------------------------------------------------------- */ static int get_state(u32 *out, u8 instance) { u32 tmp; acpi_status status; struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; if (!out) return -EINVAL; if (instance > 2) return -ENODEV; status = wmi_query_block(GUID, instance, &result); if (ACPI_FAILURE(status)) return -ENODEV; obj = (union acpi_object *) result.pointer; if (obj && obj->type == ACPI_TYPE_INTEGER) { tmp = obj->integer.value; } else { tmp = 0; } if (result.length > 0 && result.pointer) kfree(result.pointer); switch (instance) { case TC1100_INSTANCE_WIRELESS: *out = (tmp == 3) ? 1 : 0; return 0; case TC1100_INSTANCE_JOGDIAL: *out = (tmp == 1) ? 0 : 1; return 0; default: return -ENODEV; } } static int set_state(u32 *in, u8 instance) { u32 value; acpi_status status; struct acpi_buffer input; if (!in) return -EINVAL; if (instance > 2) return -ENODEV; switch (instance) { case TC1100_INSTANCE_WIRELESS: value = (*in) ? 1 : 2; break; case TC1100_INSTANCE_JOGDIAL: value = (*in) ? 0 : 1; break; default: return -ENODEV; } input.length = sizeof(u32); input.pointer = &value; status = wmi_set_block(GUID, instance, &input); if (ACPI_FAILURE(status)) return -ENODEV; return 0; } /* -------------------------------------------------------------------------- FS Interface (/sys) -------------------------------------------------------------------------- */ /* * Read/ write bool sysfs macro */ #define show_set_bool(value, instance) \ static ssize_t \ show_bool_##value(struct device *dev, struct device_attribute *attr, \ char *buf) \ { \ u32 result; \ acpi_status status = get_state(&result, instance); \ if (ACPI_SUCCESS(status)) \ return sprintf(buf, "%d\n", result); \ return sprintf(buf, "Read error\n"); \ } \ \ static ssize_t \ set_bool_##value(struct device *dev, struct device_attribute *attr, \ const char *buf, size_t count) \ { \ u32 tmp = simple_strtoul(buf, NULL, 10); \ acpi_status status = set_state(&tmp, instance); \ if (ACPI_FAILURE(status)) \ return -EINVAL; \ return count; \ } \ static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \ show_bool_##value, set_bool_##value); show_set_bool(wireless, TC1100_INSTANCE_WIRELESS); show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL); static struct attribute *tc1100_attributes[] = { &dev_attr_wireless.attr, &dev_attr_jogdial.attr, NULL }; static struct attribute_group tc1100_attribute_group = { .attrs = tc1100_attributes, }; /* -------------------------------------------------------------------------- Driver Model -------------------------------------------------------------------------- */ static int __init tc1100_probe(struct platform_device *device) { return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group); } static int __devexit tc1100_remove(struct platform_device *device) { sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group); return 0; } #ifdef CONFIG_PM static int tc1100_suspend(struct device *dev) { int ret; ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS); if (ret) return ret; ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL); if (ret) return ret; return 0; } static int tc1100_resume(struct device *dev) { int ret; ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS); if (ret) return ret; ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL); if (ret) return ret; return 0; } static const struct dev_pm_ops tc1100_pm_ops = { .suspend = tc1100_suspend, .resume = tc1100_resume, .freeze = tc1100_suspend, .restore = tc1100_resume, }; #endif static struct platform_driver tc1100_driver = { .driver = { .name = "tc1100-wmi", .owner = THIS_MODULE, #ifdef CONFIG_PM .pm = &tc1100_pm_ops, #endif }, .remove = __devexit_p(tc1100_remove), }; static int __init tc1100_init(void) { int error; if (!wmi_has_guid(GUID)) return -ENODEV; tc1100_device = platform_device_alloc("tc1100-wmi", -1); if (!tc1100_device) return -ENOMEM; error = platform_device_add(tc1100_device); if (error) goto err_device_put; error = platform_driver_probe(&tc1100_driver, tc1100_probe); if (error) goto err_device_del; printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n"); return 0; err_device_del: platform_device_del(tc1100_device); err_device_put: platform_device_put(tc1100_device); return error; } static void __exit tc1100_exit(void) { platform_device_unregister(tc1100_device); platform_driver_unregister(&tc1100_driver); } module_init(tc1100_init); module_exit(tc1100_exit);