/* * acpi_fan.c - ACPI Fan Driver ($Revision: 29 $) * * 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 <linux/proc_fs.h> #include <linux/seq_file.h> #include <asm/uaccess.h> #include <linux/thermal.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #define ACPI_FAN_CLASS "fan" #define ACPI_FAN_FILE_STATE "state" #define _COMPONENT ACPI_FAN_COMPONENT ACPI_MODULE_NAME("fan"); MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION("ACPI Fan Driver"); MODULE_LICENSE("GPL"); static int acpi_fan_add(struct acpi_device *device); static int acpi_fan_remove(struct acpi_device *device, int type); static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state); static int acpi_fan_resume(struct acpi_device *device); static const struct acpi_device_id fan_device_ids[] = { {"PNP0C0B", 0}, {"", 0}, }; MODULE_DEVICE_TABLE(acpi, fan_device_ids); static struct acpi_driver acpi_fan_driver = { .name = "fan", .class = ACPI_FAN_CLASS, .ids = fan_device_ids, .ops = { .add = acpi_fan_add, .remove = acpi_fan_remove, .suspend = acpi_fan_suspend, .resume = acpi_fan_resume, }, }; /* thermal cooling device callbacks */ static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state) { /* ACPI fan device only support two states: ON/OFF */ *state = 1; return 0; } static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long *state) { struct acpi_device *device = cdev->devdata; int result; int acpi_state; if (!device) return -EINVAL; result = acpi_bus_get_power(device->handle, &acpi_state); if (result) return result; *state = (acpi_state == ACPI_STATE_D3 ? 0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1)); return 0; } static int fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) { struct acpi_device *device = cdev->devdata; int result; if (!device || (state != 0 && state != 1)) return -EINVAL; result = acpi_bus_set_power(device->handle, state ? ACPI_STATE_D0 : ACPI_STATE_D3); return result; } static struct thermal_cooling_device_ops fan_cooling_ops = { .get_max_state = fan_get_max_state, .get_cur_state = fan_get_cur_state, .set_cur_state = fan_set_cur_state, }; /* -------------------------------------------------------------------------- FS Interface (/proc) -------------------------------------------------------------------------- */ #ifdef CONFIG_ACPI_PROCFS static struct proc_dir_entry *acpi_fan_dir; static int acpi_fan_read_state(struct seq_file *seq, void *offset) { struct acpi_device *device = seq->private; int state = 0; if (device) { if (acpi_bus_get_power(device->handle, &state)) seq_printf(seq, "status: ERROR\n"); else seq_printf(seq, "status: %s\n", !state ? "on" : "off"); } return 0; } static int acpi_fan_state_open_fs(struct inode *inode, struct file *file) { return single_open(file, acpi_fan_read_state, PDE(inode)->data); } static ssize_t acpi_fan_write_state(struct file *file, const char __user * buffer, size_t count, loff_t * ppos) { int result = 0; struct seq_file *m = file->private_data; struct acpi_device *device = m->private; char state_string[3] = { '\0' }; if (count > sizeof(state_string) - 1) return -EINVAL; if (copy_from_user(state_string, buffer, count)) return -EFAULT; state_string[count] = '\0'; if ((state_string[0] < '0') || (state_string[0] > '3')) return -EINVAL; if (state_string[1] == '\n') state_string[1] = '\0'; if (state_string[1] != '\0') return -EINVAL; result = acpi_bus_set_power(device->handle, simple_strtoul(state_string, NULL, 0)); if (result) return result; return count; } static const struct file_operations acpi_fan_state_ops = { .open = acpi_fan_state_open_fs, .read = seq_read, .write = acpi_fan_write_state, .llseek = seq_lseek, .release = single_release, .owner = THIS_MODULE, }; static int acpi_fan_add_fs(struct acpi_device *device) { struct proc_dir_entry *entry = NULL; if (!device) return -EINVAL; if (!acpi_device_dir(device)) { acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_fan_dir); if (!acpi_device_dir(device)) return -ENODEV; } /* 'status' [R/W] */ entry = proc_create_data(ACPI_FAN_FILE_STATE, S_IFREG | S_IRUGO | S_IWUSR, acpi_device_dir(device), &acpi_fan_state_ops, device); if (!entry) return -ENODEV; return 0; } static int acpi_fan_remove_fs(struct acpi_device *device) { if (acpi_device_dir(device)) { remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device)); remove_proc_entry(acpi_device_bid(device), acpi_fan_dir); acpi_device_dir(device) = NULL; } return 0; } #else static int acpi_fan_add_fs(struct acpi_device *device) { return 0; } static int acpi_fan_remove_fs(struct acpi_device *device) { return 0; } #endif /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ static int acpi_fan_add(struct acpi_device *device) { int result = 0; int state = 0; struct thermal_cooling_device *cdev; if (!device) return -EINVAL; strcpy(acpi_device_name(device), "Fan"); strcpy(acpi_device_class(device), ACPI_FAN_CLASS); result = acpi_bus_get_power(device->handle, &state); if (result) { printk(KERN_ERR PREFIX "Reading power state\n"); goto end; } device->flags.force_power_state = 1; acpi_bus_set_power(device->handle, state); device->flags.force_power_state = 0; cdev = thermal_cooling_device_register("Fan", device, &fan_cooling_ops); if (IS_ERR(cdev)) { result = PTR_ERR(cdev); goto end; } dev_info(&device->dev, "registered as cooling_device%d\n", cdev->id); device->driver_data = cdev; result = sysfs_create_link(&device->dev.kobj, &cdev->device.kobj, "thermal_cooling"); if (result) dev_err(&device->dev, "Failed to create sysfs link " "'thermal_cooling'\n"); result = sysfs_create_link(&cdev->device.kobj, &device->dev.kobj, "device"); if (result) dev_err(&device->dev, "Failed to create sysfs link " "'device'\n"); result = acpi_fan_add_fs(device); if (result) goto end; printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), acpi_device_bid(device), !device->power.state ? "on" : "off"); end: return result; } static int acpi_fan_remove(struct acpi_device *device, int type) { struct thermal_cooling_device *cdev = acpi_driver_data(device); if (!device || !cdev) return -EINVAL; acpi_fan_remove_fs(device); sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); sysfs_remove_link(&cdev->device.kobj, "device"); thermal_cooling_device_unregister(cdev); return 0; } static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state) { if (!device) return -EINVAL; acpi_bus_set_power(device->handle, ACPI_STATE_D0); return AE_OK; } static int acpi_fan_resume(struct acpi_device *device) { int result = 0; int power_state = 0; if (!device) return -EINVAL; result = acpi_bus_get_power(device->handle, &power_state); if (result) { printk(KERN_ERR PREFIX "Error reading fan power state\n"); return result; } device->flags.force_power_state = 1; acpi_bus_set_power(device->handle, power_state); device->flags.force_power_state = 0; return result; } static int __init acpi_fan_init(void) { int result = 0; #ifdef CONFIG_ACPI_PROCFS acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir); if (!acpi_fan_dir) return -ENODEV; #endif result = acpi_bus_register_driver(&acpi_fan_driver); if (result < 0) { remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); return -ENODEV; } return 0; } static void __exit acpi_fan_exit(void) { acpi_bus_unregister_driver(&acpi_fan_driver); remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); return; } module_init(acpi_fan_init); module_exit(acpi_fan_exit);