thermal.c

linux 内核源代码

		return -EINVAL;

	if (!tz->flags.cooling_mode)
		return -ENODEV;

	if (copy_from_user(mode_string, buffer, count))
		return -EFAULT;

	mode_string[count] = '\0';

	result = acpi_thermal_set_cooling_mode(tz,
					       simple_strtoul(mode_string, NULL,
							      0));
	if (result)
		return result;

	acpi_thermal_check(tz);

	return count;
}

static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_thermal *tz = seq->private;


	if (!tz)
		goto end;

	if (!tz->polling_frequency) {
		seq_puts(seq, "<polling disabled>\n");
		goto end;
	}

	seq_printf(seq, "polling frequency:       %lu seconds\n",
		   (tz->polling_frequency / 10));

      end:
	return 0;
}

static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_polling_seq_show,
			   PDE(inode)->data);
}

static ssize_t
acpi_thermal_write_polling(struct file *file,
			   const char __user * buffer,
			   size_t count, loff_t * ppos)
{
	struct seq_file *m = file->private_data;
	struct acpi_thermal *tz = m->private;
	int result = 0;
	char polling_string[12] = { '\0' };
	int seconds = 0;


	if (!tz || (count > sizeof(polling_string) - 1))
		return -EINVAL;

	if (copy_from_user(polling_string, buffer, count))
		return -EFAULT;

	polling_string[count] = '\0';

	seconds = simple_strtoul(polling_string, NULL, 0);

	result = acpi_thermal_set_polling(tz, seconds);
	if (result)
		return result;

	acpi_thermal_check(tz);

	return count;
}

static int acpi_thermal_add_fs(struct acpi_device *device)
{
	struct proc_dir_entry *entry = NULL;


	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
						     acpi_thermal_dir);
		if (!acpi_device_dir(device))
			return -ENODEV;
		acpi_device_dir(device)->owner = THIS_MODULE;
	}

	/* 'state' [R] */
	entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
				  S_IRUGO, acpi_device_dir(device));
	if (!entry)
		return -ENODEV;
	else {
		entry->proc_fops = &acpi_thermal_state_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	/* 'temperature' [R] */
	entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
				  S_IRUGO, acpi_device_dir(device));
	if (!entry)
		return -ENODEV;
	else {
		entry->proc_fops = &acpi_thermal_temp_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	/* 'trip_points' [R] */
	entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
				  S_IRUGO,
				  acpi_device_dir(device));
	if (!entry)
		return -ENODEV;
	else {
		entry->proc_fops = &acpi_thermal_trip_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	/* 'cooling_mode' [R/W] */
	entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
				  S_IFREG | S_IRUGO | S_IWUSR,
				  acpi_device_dir(device));
	if (!entry)
		return -ENODEV;
	else {
		entry->proc_fops = &acpi_thermal_cooling_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	/* 'polling_frequency' [R/W] */
	entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
				  S_IFREG | S_IRUGO | S_IWUSR,
				  acpi_device_dir(device));
	if (!entry)
		return -ENODEV;
	else {
		entry->proc_fops = &acpi_thermal_polling_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	return 0;
}

static int acpi_thermal_remove_fs(struct acpi_device *device)
{

	if (acpi_device_dir(device)) {
		remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_STATE,
				  acpi_device_dir(device));
		remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
		acpi_device_dir(device) = NULL;
	}

	return 0;
}

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */

static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
{
	struct acpi_thermal *tz = data;
	struct acpi_device *device = NULL;


	if (!tz)
		return;

	device = tz->device;

	switch (event) {
	case ACPI_THERMAL_NOTIFY_TEMPERATURE:
		acpi_thermal_check(tz);
		break;
	case ACPI_THERMAL_NOTIFY_THRESHOLDS:
		acpi_thermal_get_trip_points(tz);
		acpi_thermal_check(tz);
		acpi_bus_generate_proc_event(device, event, 0);
		acpi_bus_generate_netlink_event(device->pnp.device_class,
						  device->dev.bus_id, event, 0);
		break;
	case ACPI_THERMAL_NOTIFY_DEVICES:
		if (tz->flags.devices)
			acpi_thermal_get_devices(tz);
		acpi_bus_generate_proc_event(device, event, 0);
		acpi_bus_generate_netlink_event(device->pnp.device_class,
						  device->dev.bus_id, event, 0);
		break;
	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Unsupported event [0x%x]\n", event));
		break;
	}

	return;
}

static int acpi_thermal_get_info(struct acpi_thermal *tz)
{
	int result = 0;


	if (!tz)
		return -EINVAL;

	/* Get temperature [_TMP] (required) */
	result = acpi_thermal_get_temperature(tz);
	if (result)
		return result;

	/* Get trip points [_CRT, _PSV, etc.] (required) */
	result = acpi_thermal_get_trip_points(tz);
	if (result)
		return result;

	/* Set the cooling mode [_SCP] to active cooling (default) */
	result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
	if (!result)
		tz->flags.cooling_mode = 1;

	/* Get default polling frequency [_TZP] (optional) */
	if (tzp)
		tz->polling_frequency = tzp;
	else
		acpi_thermal_get_polling_frequency(tz);

	/* Get devices in this thermal zone [_TZD] (optional) */
	result = acpi_thermal_get_devices(tz);
	if (!result)
		tz->flags.devices = 1;

	return 0;
}

static int acpi_thermal_add(struct acpi_device *device)
{
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_thermal *tz = NULL;


	if (!device)
		return -EINVAL;

	tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
	if (!tz)
		return -ENOMEM;

	tz->device = device;
	strcpy(tz->name, device->pnp.bus_id);
	strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
	acpi_driver_data(device) = tz;
	mutex_init(&tz->lock);
	result = acpi_thermal_get_info(tz);
	if (result)
		goto end;

	result = acpi_thermal_add_fs(device);
	if (result)
		goto end;

	init_timer(&tz->timer);

	acpi_thermal_check(tz);

	status = acpi_install_notify_handler(device->handle,
					     ACPI_DEVICE_NOTIFY,
					     acpi_thermal_notify, tz);
	if (ACPI_FAILURE(status)) {
		result = -ENODEV;
		goto end;
	}

	printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
	       acpi_device_name(device), acpi_device_bid(device),
	       KELVIN_TO_CELSIUS(tz->temperature));

      end:
	if (result) {
		acpi_thermal_remove_fs(device);
		kfree(tz);
	}

	return result;
}

static int acpi_thermal_remove(struct acpi_device *device, int type)
{
	acpi_status status = AE_OK;
	struct acpi_thermal *tz = NULL;


	if (!device || !acpi_driver_data(device))
		return -EINVAL;

	tz = acpi_driver_data(device);

	/* avoid timer adding new defer task */
	tz->zombie = 1;
	/* wait for running timer (on other CPUs) finish */
	del_timer_sync(&(tz->timer));
	/* synchronize deferred task */
	acpi_os_wait_events_complete(NULL);
	/* deferred task may reinsert timer */
	del_timer_sync(&(tz->timer));

	status = acpi_remove_notify_handler(device->handle,
					    ACPI_DEVICE_NOTIFY,
					    acpi_thermal_notify);

	/* Terminate policy */
	if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
		tz->trips.passive.flags.enabled = 0;
		acpi_thermal_passive(tz);
	}
	if (tz->trips.active[0].flags.valid
	    && tz->trips.active[0].flags.enabled) {
		tz->trips.active[0].flags.enabled = 0;
		acpi_thermal_active(tz);
	}

	acpi_thermal_remove_fs(device);
	mutex_destroy(&tz->lock);
	kfree(tz);
	return 0;
}

static int acpi_thermal_resume(struct acpi_device *device)
{
	struct acpi_thermal *tz = NULL;
	int i, j, power_state, result;


	if (!device || !acpi_driver_data(device))
		return -EINVAL;

	tz = acpi_driver_data(device);

	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
		if (!(&tz->trips.active[i]))
			break;
		if (!tz->trips.active[i].flags.valid)
			break;
		tz->trips.active[i].flags.enabled = 1;
		for (j = 0; j < tz->trips.active[i].devices.count; j++) {
			result = acpi_bus_get_power(tz->trips.active[i].devices.
			    handles[j], &power_state);
			if (result || (power_state != ACPI_STATE_D0)) {
				tz->trips.active[i].flags.enabled = 0;
				break;
			}
		}
		tz->state.active |= tz->trips.active[i].flags.enabled;
	}

	acpi_thermal_check(tz);

	return AE_OK;
}

#ifdef CONFIG_DMI
static int thermal_act(const struct dmi_system_id *d) {

	if (act == 0) {
		printk(KERN_NOTICE "ACPI: %s detected: "
			"disabling all active thermal trip points\n", d->ident);
		act = -1;
	}
	return 0;
}
static int thermal_nocrt(const struct dmi_system_id *d) {

	printk(KERN_NOTICE "ACPI: %s detected: "
		"disabling all critical thermal trip point actions.\n", d->ident);
	nocrt = 1;
	return 0;
}
static int thermal_tzp(const struct dmi_system_id *d) {

	if (tzp == 0) {
		printk(KERN_NOTICE "ACPI: %s detected: "
			"enabling thermal zone polling\n", d->ident);
		tzp = 300;	/* 300 dS = 30 Seconds */
	}
	return 0;
}
static int thermal_psv(const struct dmi_system_id *d) {

	if (psv == 0) {
		printk(KERN_NOTICE "ACPI: %s detected: "
			"disabling all passive thermal trip points\n", d->ident);
		psv = -1;
	}
	return 0;
}

static struct dmi_system_id thermal_dmi_table[] __initdata = {
	/*
	 * Award BIOS on this AOpen makes thermal control almost worthless.
	 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
	 */
	{
	 .callback = thermal_act,
	 .ident = "AOpen i915GMm-HFS",
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
		},
	},
	{
	 .callback = thermal_psv,
	 .ident = "AOpen i915GMm-HFS",
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
		},
	},
	{
	 .callback = thermal_tzp,
	 .ident = "AOpen i915GMm-HFS",
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
		},
	},
	{
	 .callback = thermal_nocrt,
	 .ident = "Gigabyte GA-7ZX",
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
		DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
		},
	},
	{}
};
#endif /* CONFIG_DMI */

static int __init acpi_thermal_init(void)
{
	int result = 0;

	dmi_check_system(thermal_dmi_table);

	if (off) {
		printk(KERN_NOTICE "ACPI: thermal control disabled\n");
		return -ENODEV;
	}
	acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
	if (!acpi_thermal_dir)
		return -ENODEV;
	acpi_thermal_dir->owner = THIS_MODULE;

	result = acpi_bus_register_driver(&acpi_thermal_driver);
	if (result < 0) {
		remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
		return -ENODEV;
	}

	return 0;
}

static void __exit acpi_thermal_exit(void)
{

	acpi_bus_unregister_driver(&acpi_thermal_driver);

	remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);

	return;
}

module_init(acpi_thermal_init);
module_exit(acpi_thermal_exit);