[mirror_ubuntu-bionic-kernel.git] / drivers / platform / x86 / intel_menlow.c

/*
 *  intel_menlow.c - Intel menlow Driver for thermal management extension
 *
 *  Copyright (C) 2008 Intel Corp
 *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
 *  Copyright (C) 2008 Zhang Rui <rui.zhang@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; version 2 of the License.
 *
 *  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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This driver creates the sys I/F for programming the sensors.
 *  It also implements the driver for intel menlow memory controller (hardware
 *  id is INT0002) which makes use of the platform specific ACPI methods
 *  to get/set bandwidth.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/pm.h>

#include <linux/thermal.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

MODULE_AUTHOR("Thomas Sujith");
MODULE_AUTHOR("Zhang Rui");
MODULE_DESCRIPTION("Intel Menlow platform specific driver");
MODULE_LICENSE("GPL");

/*
 * Memory controller device control
 */

#define MEMORY_GET_BANDWIDTH "GTHS"
#define MEMORY_SET_BANDWIDTH "STHS"
#define MEMORY_ARG_CUR_BANDWIDTH 1
#define MEMORY_ARG_MAX_BANDWIDTH 0

/*
 * GTHS returning 'n' would mean that [0,n-1] states are supported
 * In that case max_cstate would be n-1
 * GTHS returning '0' would mean that no bandwidth control states are supported
 */
static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
				    unsigned long *max_state)
{
	struct acpi_device *device = cdev->devdata;
	acpi_handle handle = device->handle;
	unsigned long long value;
	struct acpi_object_list arg_list;
	union acpi_object arg;
	acpi_status status = AE_OK;

	arg_list.count = 1;
	arg_list.pointer = &arg;
	arg.type = ACPI_TYPE_INTEGER;
	arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
	status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
				       &arg_list, &value);
	if (ACPI_FAILURE(status))
		return -EFAULT;

	if (!value)
		return -EINVAL;

	*max_state = value - 1;
	return 0;
}

static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
				    unsigned long *value)
{
	struct acpi_device *device = cdev->devdata;
	acpi_handle handle = device->handle;
	unsigned long long result;
	struct acpi_object_list arg_list;
	union acpi_object arg;
	acpi_status status = AE_OK;

	arg_list.count = 1;
	arg_list.pointer = &arg;
	arg.type = ACPI_TYPE_INTEGER;
	arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
	status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
				       &arg_list, &result);
	if (ACPI_FAILURE(status))
		return -EFAULT;

	*value = result;
	return 0;
}

static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
				    unsigned long state)
{
	struct acpi_device *device = cdev->devdata;
	acpi_handle handle = device->handle;
	struct acpi_object_list arg_list;
	union acpi_object arg;
	acpi_status status;
	unsigned long long temp;
	unsigned long max_state;

	if (memory_get_max_bandwidth(cdev, &max_state))
		return -EFAULT;

	if (state > max_state)
		return -EINVAL;

	arg_list.count = 1;
	arg_list.pointer = &arg;
	arg.type = ACPI_TYPE_INTEGER;
	arg.integer.value = state;

	status =
	    acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
				  &temp);

	printk(KERN_INFO
	       "Bandwidth value was %ld: status is %d\n", state, status);
	if (ACPI_FAILURE(status))
		return -EFAULT;

	return 0;
}

static struct thermal_cooling_device_ops memory_cooling_ops = {
	.get_max_state = memory_get_max_bandwidth,
	.get_cur_state = memory_get_cur_bandwidth,
	.set_cur_state = memory_set_cur_bandwidth,
};

/*
 * Memory Device Management
 */
static int intel_menlow_memory_add(struct acpi_device *device)
{
	int result = -ENODEV;
	acpi_status status = AE_OK;
	acpi_handle dummy;
	struct thermal_cooling_device *cdev;

	if (!device)
		return -EINVAL;

	status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy);
	if (ACPI_FAILURE(status))
		goto end;

	status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy);
	if (ACPI_FAILURE(status))
		goto end;

	cdev = thermal_cooling_device_register("Memory controller", device,
					       &memory_cooling_ops);
	if (IS_ERR(cdev)) {
		result = PTR_ERR(cdev);
		goto end;
	}

	device->driver_data = cdev;
	result = sysfs_create_link(&device->dev.kobj,
				&cdev->device.kobj, "thermal_cooling");
	if (result)
		goto unregister;

	result = sysfs_create_link(&cdev->device.kobj,
				&device->dev.kobj, "device");
	if (result) {
		sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
		goto unregister;
	}

 end:
	return result;

 unregister:
	thermal_cooling_device_unregister(cdev);
	return result;

}

static int intel_menlow_memory_remove(struct acpi_device *device, int type)
{
	struct thermal_cooling_device *cdev = acpi_driver_data(device);

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

	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
	sysfs_remove_link(&cdev->device.kobj, "device");
	thermal_cooling_device_unregister(cdev);

	return 0;
}

static const struct acpi_device_id intel_menlow_memory_ids[] = {
	{"INT0002", 0},
	{"", 0},
};

static struct acpi_driver intel_menlow_memory_driver = {
	.name = "intel_menlow_thermal_control",
	.ids = intel_menlow_memory_ids,
	.ops = {
		.add = intel_menlow_memory_add,
		.remove = intel_menlow_memory_remove,
		},
};

/*
 * Sensor control on menlow platform
 */

#define THERMAL_AUX0 0
#define THERMAL_AUX1 1
#define GET_AUX0 "GAX0"
#define GET_AUX1 "GAX1"
#define SET_AUX0 "SAX0"
#define SET_AUX1 "SAX1"

struct intel_menlow_attribute {
	struct device_attribute attr;
	struct device *device;
	acpi_handle handle;
	struct list_head node;
};

static LIST_HEAD(intel_menlow_attr_list);
static DEFINE_MUTEX(intel_menlow_attr_lock);

/*
 * sensor_get_auxtrip - get the current auxtrip value from sensor
 * @name: Thermalzone name
 * @auxtype : AUX0/AUX1
 * @buf: syfs buffer
 */
static int sensor_get_auxtrip(acpi_handle handle, int index,
							unsigned long long *value)
{
	acpi_status status;

	if ((index != 0 && index != 1) || !value)
		return -EINVAL;

	status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
				       NULL, value);
	if (ACPI_FAILURE(status))
		return -EIO;

	return 0;
}

/*
 * sensor_set_auxtrip - set the new auxtrip value to sensor
 * @name: Thermalzone name
 * @auxtype : AUX0/AUX1
 * @buf: syfs buffer
 */
static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
{
	acpi_status status;
	union acpi_object arg = {
		ACPI_TYPE_INTEGER
	};
	struct acpi_object_list args = {
		1, &arg
	};
	unsigned long long temp;

	if (index != 0 && index != 1)
		return -EINVAL;

	status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
				       NULL, &temp);
	if (ACPI_FAILURE(status))
		return -EIO;
	if ((index && value < temp) || (!index && value > temp))
		return -EINVAL;

	arg.integer.value = value;
	status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
				       &args, &temp);
	if (ACPI_FAILURE(status))
		return -EIO;

	/* do we need to check the return value of SAX0/SAX1 ? */

	return 0;
}

#define to_intel_menlow_attr(_attr)	\
	container_of(_attr, struct intel_menlow_attribute, attr)

static ssize_t aux0_show(struct device *dev,
			 struct device_attribute *dev_attr, char *buf)
{
	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	unsigned long long value;
	int result;

	result = sensor_get_auxtrip(attr->handle, 0, &value);

	return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
}

static ssize_t aux1_show(struct device *dev,
			 struct device_attribute *dev_attr, char *buf)
{
	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	unsigned long long value;
	int result;

	result = sensor_get_auxtrip(attr->handle, 1, &value);

	return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
}

static ssize_t aux0_store(struct device *dev,
			  struct device_attribute *dev_attr,
			  const char *buf, size_t count)
{
	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	int value;
	int result;

	/*Sanity check; should be a positive integer */
	if (!sscanf(buf, "%d", &value))
		return -EINVAL;

	if (value < 0)
		return -EINVAL;

	result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
	return result ? result : count;
}

static ssize_t aux1_store(struct device *dev,
			  struct device_attribute *dev_attr,
			  const char *buf, size_t count)
{
	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	int value;
	int result;

	/*Sanity check; should be a positive integer */
	if (!sscanf(buf, "%d", &value))
		return -EINVAL;

	if (value < 0)
		return -EINVAL;

	result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
	return result ? result : count;
}

/* BIOS can enable/disable the thermal user application in dabney platform */
#define BIOS_ENABLED "\\_TZ.GSTS"
static ssize_t bios_enabled_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	acpi_status status;
	unsigned long long bios_enabled;

	status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
}

static int intel_menlow_add_one_attribute(char *name, int mode, void *show,
					  void *store, struct device *dev,
					  acpi_handle handle)
{
	struct intel_menlow_attribute *attr;
	int result;

	attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
	if (!attr)
		return -ENOMEM;

	attr->attr.attr.name = name;
	attr->attr.attr.mode = mode;
	attr->attr.show = show;
	attr->attr.store = store;
	attr->device = dev;
	attr->handle = handle;

	result = device_create_file(dev, &attr->attr);
	if (result)
		return result;

	mutex_lock(&intel_menlow_attr_lock);
	list_add_tail(&attr->node, &intel_menlow_attr_list);
	mutex_unlock(&intel_menlow_attr_lock);

	return 0;
}

static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
						void *context, void **rv)
{
	acpi_status status;
	acpi_handle dummy;
	struct thermal_zone_device *thermal;
	int result;

	result = acpi_bus_get_private_data(handle, (void **)&thermal);
	if (result)
		return 0;

	/* _TZ must have the AUX0/1 methods */
	status = acpi_get_handle(handle, GET_AUX0, &dummy);
	if (ACPI_FAILURE(status))
		goto not_found;

	status = acpi_get_handle(handle, SET_AUX0, &dummy);
	if (ACPI_FAILURE(status))
		goto not_found;

	result = intel_menlow_add_one_attribute("aux0", 0644,
						aux0_show, aux0_store,
						&thermal->device, handle);
	if (result)
		return AE_ERROR;

	status = acpi_get_handle(handle, GET_AUX1, &dummy);
	if (ACPI_FAILURE(status))
		goto not_found;

	status = acpi_get_handle(handle, SET_AUX1, &dummy);
	if (ACPI_FAILURE(status))
		goto not_found;

	result = intel_menlow_add_one_attribute("aux1", 0644,
						aux1_show, aux1_store,
						&thermal->device, handle);
	if (result)
		return AE_ERROR;

	/*
	 * create the "dabney_enabled" attribute which means the user app
	 * should be loaded or not
	 */

	result = intel_menlow_add_one_attribute("bios_enabled", 0444,
						bios_enabled_show, NULL,
						&thermal->device, handle);
	if (result)
		return AE_ERROR;

 not_found:
	if (status == AE_NOT_FOUND)
		return AE_OK;
	else
		return status;
}

static void intel_menlow_unregister_sensor(void)
{
	struct intel_menlow_attribute *pos, *next;

	mutex_lock(&intel_menlow_attr_lock);
	list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
		list_del(&pos->node);
		device_remove_file(pos->device, &pos->attr);
		kfree(pos);
	}
	mutex_unlock(&intel_menlow_attr_lock);

	return;
}

static int __init intel_menlow_module_init(void)
{
	int result = -ENODEV;
	acpi_status status;
	unsigned long long enable;

	if (acpi_disabled)
		return result;

	/* Looking for the \_TZ.GSTS method */
	status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
	if (ACPI_FAILURE(status) || !enable)
		return -ENODEV;

	/* Looking for ACPI device MEM0 with hardware id INT0002 */
	result = acpi_bus_register_driver(&intel_menlow_memory_driver);
	if (result)
		return result;

	/* Looking for sensors in each ACPI thermal zone */
	status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
				     ACPI_UINT32_MAX,
				     intel_menlow_register_sensor, NULL, NULL, NULL);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	return 0;
}

static void __exit intel_menlow_module_exit(void)
{
	acpi_bus_unregister_driver(&intel_menlow_memory_driver);
	intel_menlow_unregister_sensor();
}

module_init(intel_menlow_module_init);
module_exit(intel_menlow_module_exit);
Commit	Line	Data
cc0573b3 TS	1	/*
	2	* intel_menlow.c - Intel menlow Driver for thermal management extension
	3	*
	4	* Copyright (C) 2008 Intel Corp
	5	* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
	6	* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
	7	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; version 2 of the License.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License along
	19	* with this program; if not, write to the Free Software Foundation, Inc.,
	20	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	21	*
	22	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	23	*
	24	* This driver creates the sys I/F for programming the sensors.
	25	* It also implements the driver for intel menlow memory controller (hardware
	26	* id is INT0002) which makes use of the platform specific ACPI methods
	27	* to get/set bandwidth.
	28	*/
	29
	30	#include <linux/kernel.h>
	31	#include <linux/module.h>
	32	#include <linux/init.h>
5a0e3ad6	33	#include <linux/slab.h>
cc0573b3 TS	34	#include <linux/types.h>
	35	#include <linux/pci.h>
	36	#include <linux/pm.h>
	37
	38	#include <linux/thermal.h>
	39	#include <acpi/acpi_bus.h>
	40	#include <acpi/acpi_drivers.h>
	41
	42	MODULE_AUTHOR("Thomas Sujith");
	43	MODULE_AUTHOR("Zhang Rui");
	44	MODULE_DESCRIPTION("Intel Menlow platform specific driver");
	45	MODULE_LICENSE("GPL");
	46
	47	/*
	48	* Memory controller device control
	49	*/
	50
	51	#define MEMORY_GET_BANDWIDTH "GTHS"
	52	#define MEMORY_SET_BANDWIDTH "STHS"
	53	#define MEMORY_ARG_CUR_BANDWIDTH 1
	54	#define MEMORY_ARG_MAX_BANDWIDTH 0
	55
d65dcdcf TS	56	/*
	57	* GTHS returning 'n' would mean that [0,n-1] states are supported
	58	* In that case max_cstate would be n-1
	59	* GTHS returning '0' would mean that no bandwidth control states are supported
	60	*/
6503e5df MG	61	static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
6503e5df MG	62	unsigned long *max_state)
cc0573b3 TS	63	{
	64	struct acpi_device *device = cdev->devdata;
	65	acpi_handle handle = device->handle;
27663c58	66	unsigned long long value;
cc0573b3 TS	67	struct acpi_object_list arg_list;
	68	union acpi_object arg;
	69	acpi_status status = AE_OK;
	70
	71	arg_list.count = 1;
	72	arg_list.pointer = &arg;
	73	arg.type = ACPI_TYPE_INTEGER;
	74	arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
	75	status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
	76	&arg_list, &value);
	77	if (ACPI_FAILURE(status))
	78	return -EFAULT;
	79
c2d06fe3 ZR	80	if (!value)
	81	return -EINVAL;
	82
cc0573b3 TS	83	*max_state = value - 1;
	84	return 0;
	85	}
	86
cc0573b3	87	static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
6503e5df	88	unsigned long *value)
cc0573b3 TS	89	{
	90	struct acpi_device *device = cdev->devdata;
	91	acpi_handle handle = device->handle;
6503e5df	92	unsigned long long result;
cc0573b3 TS	93	struct acpi_object_list arg_list;
	94	union acpi_object arg;
	95	acpi_status status = AE_OK;
	96
	97	arg_list.count = 1;
	98	arg_list.pointer = &arg;
	99	arg.type = ACPI_TYPE_INTEGER;
	100	arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
	101	status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
6503e5df	102	&arg_list, &result);
cc0573b3 TS	103	if (ACPI_FAILURE(status))
	104	return -EFAULT;
	105
6503e5df MG	106	*value = result;
6503e5df MG	107	return 0;
cc0573b3 TS	108	}
	109
	110	static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
6503e5df	111	unsigned long state)
cc0573b3 TS	112	{
	113	struct acpi_device *device = cdev->devdata;
	114	acpi_handle handle = device->handle;
	115	struct acpi_object_list arg_list;
	116	union acpi_object arg;
	117	acpi_status status;
27663c58	118	unsigned long long temp;
cc0573b3 TS	119	unsigned long max_state;
cc0573b3 TS	120
6503e5df	121	if (memory_get_max_bandwidth(cdev, &max_state))
cc0573b3 TS	122	return -EFAULT;
cc0573b3 TS	123
c2d06fe3	124	if (state > max_state)
cc0573b3 TS	125	return -EINVAL;
	126
	127	arg_list.count = 1;
	128	arg_list.pointer = &arg;
	129	arg.type = ACPI_TYPE_INTEGER;
	130	arg.integer.value = state;
	131
	132	status =
	133	acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
27663c58	134	&temp);
cc0573b3 TS	135
cc0573b3 TS	136	printk(KERN_INFO
6503e5df	137	"Bandwidth value was %ld: status is %d\n", state, status);
cc0573b3 TS	138	if (ACPI_FAILURE(status))
	139	return -EFAULT;
	140
	141	return 0;
	142	}
	143
	144	static struct thermal_cooling_device_ops memory_cooling_ops = {
	145	.get_max_state = memory_get_max_bandwidth,
	146	.get_cur_state = memory_get_cur_bandwidth,
	147	.set_cur_state = memory_set_cur_bandwidth,
	148	};
	149
	150	/*
	151	* Memory Device Management
	152	*/
	153	static int intel_menlow_memory_add(struct acpi_device *device)
	154	{
	155	int result = -ENODEV;
	156	acpi_status status = AE_OK;
	157	acpi_handle dummy;
	158	struct thermal_cooling_device *cdev;
	159
	160	if (!device)
	161	return -EINVAL;
	162
	163	status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy);
	164	if (ACPI_FAILURE(status))
	165	goto end;
	166
	167	status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy);
	168	if (ACPI_FAILURE(status))
	169	goto end;
	170
	171	cdev = thermal_cooling_device_register("Memory controller", device,
	172	&memory_cooling_ops);
69f6b8dd TS	173	if (IS_ERR(cdev)) {
	174	result = PTR_ERR(cdev);
	175	goto end;
	176	}
	177
db89b4f0	178	device->driver_data = cdev;
3a8ca95e JL	179	result = sysfs_create_link(&device->dev.kobj,
	180	&cdev->device.kobj, "thermal_cooling");
	181	if (result)
	182	goto unregister;
	183
	184	result = sysfs_create_link(&cdev->device.kobj,
	185	&device->dev.kobj, "device");
	186	if (result) {
	187	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
	188	goto unregister;
cc0573b3 TS	189	}
	190
	191	end:
	192	return result;
	193
	194	unregister:
	195	thermal_cooling_device_unregister(cdev);
	196	return result;
	197
	198	}
	199
	200	static int intel_menlow_memory_remove(struct acpi_device *device, int type)
	201	{
	202	struct thermal_cooling_device *cdev = acpi_driver_data(device);
	203
	204	if (!device \|\| !cdev)
	205	return -EINVAL;
	206
	207	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
	208	sysfs_remove_link(&cdev->device.kobj, "device");
	209	thermal_cooling_device_unregister(cdev);
	210
	211	return 0;
	212	}
	213
f7e8dd50	214	static const struct acpi_device_id intel_menlow_memory_ids[] = {
cc0573b3 TS	215	{"INT0002", 0},
	216	{"", 0},
	217	};
	218
	219	static struct acpi_driver intel_menlow_memory_driver = {
	220	.name = "intel_menlow_thermal_control",
	221	.ids = intel_menlow_memory_ids,
	222	.ops = {
	223	.add = intel_menlow_memory_add,
	224	.remove = intel_menlow_memory_remove,
	225	},
	226	};
	227
	228	/*
	229	* Sensor control on menlow platform
	230	*/
	231
	232	#define THERMAL_AUX0 0
	233	#define THERMAL_AUX1 1
	234	#define GET_AUX0 "GAX0"
	235	#define GET_AUX1 "GAX1"
	236	#define SET_AUX0 "SAX0"
	237	#define SET_AUX1 "SAX1"
	238
	239	struct intel_menlow_attribute {
	240	struct device_attribute attr;
	241	struct device *device;
	242	acpi_handle handle;
	243	struct list_head node;
	244	};
	245
	246	static LIST_HEAD(intel_menlow_attr_list);
	247	static DEFINE_MUTEX(intel_menlow_attr_lock);
	248
	249	/*
	250	* sensor_get_auxtrip - get the current auxtrip value from sensor
	251	* @name: Thermalzone name
	252	* @auxtype : AUX0/AUX1
	253	* @buf: syfs buffer
	254	*/
27663c58 MW	255	static int sensor_get_auxtrip(acpi_handle handle, int index,
27663c58 MW	256	unsigned long long *value)
cc0573b3 TS	257	{
	258	acpi_status status;
	259
	260	if ((index != 0 && index != 1) \|\| !value)
	261	return -EINVAL;
	262
	263	status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
27663c58	264	NULL, value);
cc0573b3 TS	265	if (ACPI_FAILURE(status))
	266	return -EIO;
	267
	268	return 0;
	269	}
	270
	271	/*
	272	* sensor_set_auxtrip - set the new auxtrip value to sensor
	273	* @name: Thermalzone name
	274	* @auxtype : AUX0/AUX1
	275	* @buf: syfs buffer
	276	*/
	277	static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
	278	{
	279	acpi_status status;
	280	union acpi_object arg = {
	281	ACPI_TYPE_INTEGER
	282	};
	283	struct acpi_object_list args = {
	284	1, &arg
	285	};
27663c58	286	unsigned long long temp;
cc0573b3 TS	287
	288	if (index != 0 && index != 1)
	289	return -EINVAL;
	290
	291	status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
27663c58	292	NULL, &temp);
cc0573b3 TS	293	if (ACPI_FAILURE(status))
	294	return -EIO;
	295	if ((index && value < temp) \|\| (!index && value > temp))
	296	return -EINVAL;
	297
	298	arg.integer.value = value;
	299	status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
27663c58	300	&args, &temp);
cc0573b3 TS	301	if (ACPI_FAILURE(status))
	302	return -EIO;
	303
	304	/* do we need to check the return value of SAX0/SAX1 ? */
	305
	306	return 0;
	307	}
	308
	309	#define to_intel_menlow_attr(_attr) \
	310	container_of(_attr, struct intel_menlow_attribute, attr)
	311
	312	static ssize_t aux0_show(struct device *dev,
	313	struct device_attribute dev_attr, char buf)
	314	{
	315	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
27663c58	316	unsigned long long value;
cc0573b3 TS	317	int result;
	318
	319	result = sensor_get_auxtrip(attr->handle, 0, &value);
	320
	321	return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
	322	}
	323
	324	static ssize_t aux1_show(struct device *dev,
	325	struct device_attribute dev_attr, char buf)
	326	{
	327	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
27663c58	328	unsigned long long value;
cc0573b3 TS	329	int result;
	330
	331	result = sensor_get_auxtrip(attr->handle, 1, &value);
	332
	333	return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
	334	}
	335
	336	static ssize_t aux0_store(struct device *dev,
	337	struct device_attribute *dev_attr,
	338	const char *buf, size_t count)
	339	{
	340	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	341	int value;
	342	int result;
	343
	344	/Sanity check; should be a positive integer /
	345	if (!sscanf(buf, "%d", &value))
	346	return -EINVAL;
	347
	348	if (value < 0)
	349	return -EINVAL;
	350
	351	result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
	352	return result ? result : count;
	353	}
	354
	355	static ssize_t aux1_store(struct device *dev,
	356	struct device_attribute *dev_attr,
	357	const char *buf, size_t count)
	358	{
	359	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	360	int value;
	361	int result;
	362
	363	/Sanity check; should be a positive integer /
	364	if (!sscanf(buf, "%d", &value))
	365	return -EINVAL;
	366
	367	if (value < 0)
	368	return -EINVAL;
	369
	370	result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
	371	return result ? result : count;
	372	}
	373
	374	/* BIOS can enable/disable the thermal user application in dabney platform */
	375	#define BIOS_ENABLED "\\_TZ.GSTS"
	376	static ssize_t bios_enabled_show(struct device *dev,
	377	struct device_attribute attr, char buf)
	378	{
	379	acpi_status status;
27663c58	380	unsigned long long bios_enabled;
cc0573b3 TS	381
	382	status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
	383	if (ACPI_FAILURE(status))
	384	return -ENODEV;
	385
	386	return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
	387	}
	388
	389	static int intel_menlow_add_one_attribute(char name, int mode, void show,
	390	void store, struct device dev,
	391	acpi_handle handle)
	392	{
	393	struct intel_menlow_attribute *attr;
	394	int result;
	395
	396	attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
	397	if (!attr)
	398	return -ENOMEM;
	399
	400	attr->attr.attr.name = name;
	401	attr->attr.attr.mode = mode;
	402	attr->attr.show = show;
	403	attr->attr.store = store;
	404	attr->device = dev;
	405	attr->handle = handle;
	406
	407	result = device_create_file(dev, &attr->attr);
	408	if (result)
	409	return result;
	410
	411	mutex_lock(&intel_menlow_attr_lock);
	412	list_add_tail(&attr->node, &intel_menlow_attr_list);
	413	mutex_unlock(&intel_menlow_attr_lock);
	414
	415	return 0;
	416	}
	417
	418	static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
	419	void context, void *rv)
	420	{
	421	acpi_status status;
	422	acpi_handle dummy;
	423	struct thermal_zone_device *thermal;
	424	int result;
	425
	426	result = acpi_bus_get_private_data(handle, (void **)&thermal);
	427	if (result)
	428	return 0;
	429
	430	/* _TZ must have the AUX0/1 methods */
	431	status = acpi_get_handle(handle, GET_AUX0, &dummy);
	432	if (ACPI_FAILURE(status))
	433	goto not_found;
	434
	435	status = acpi_get_handle(handle, SET_AUX0, &dummy);
	436	if (ACPI_FAILURE(status))
	437	goto not_found;
	438
	439	result = intel_menlow_add_one_attribute("aux0", 0644,
	440	aux0_show, aux0_store,
	441	&thermal->device, handle);
	442	if (result)
	443	return AE_ERROR;
	444
445	status = acpi_get_handle(handle, GET_AUX1, &dummy);
446	if (ACPI_FAILURE(status))
447	goto not_found;
448
449	status = acpi_get_handle(handle, SET_AUX1, &dummy);
450	if (ACPI_FAILURE(status))
451	goto not_found;
452
453	result = intel_menlow_add_one_attribute("aux1", 0644,
454	aux1_show, aux1_store,
455	&thermal->device, handle);
456	if (result)
457	return AE_ERROR;
458
459	/*
460	* create the "dabney_enabled" attribute which means the user app
461	* should be loaded or not
462	*/
463
464	result = intel_menlow_add_one_attribute("bios_enabled", 0444,
465	bios_enabled_show, NULL,
466	&thermal->device, handle);
467	if (result)
468	return AE_ERROR;
469
470	not_found:
471	if (status == AE_NOT_FOUND)
472	return AE_OK;
473	else
474	return status;
475	}
476
477	static void intel_menlow_unregister_sensor(void)
478	{
479	struct intel_menlow_attribute pos, next;
480
481	mutex_lock(&intel_menlow_attr_lock);
482	list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
483	list_del(&pos->node);
484	device_remove_file(pos->device, &pos->attr);
485	kfree(pos);
486	}
487	mutex_unlock(&intel_menlow_attr_lock);
488
489	return;
490	}
491
492	static int __init intel_menlow_module_init(void)
493	{
494	int result = -ENODEV;
495	acpi_status status;
27663c58	496	unsigned long long enable;
cc0573b3 TS	497
	498	if (acpi_disabled)
	499	return result;
	500
	501	/* Looking for the \_TZ.GSTS method */
	502	status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
	503	if (ACPI_FAILURE(status) \|\| !enable)
	504	return -ENODEV;
	505
	506	/* Looking for ACPI device MEM0 with hardware id INT0002 */
	507	result = acpi_bus_register_driver(&intel_menlow_memory_driver);
	508	if (result)
	509	return result;
	510
	511	/* Looking for sensors in each ACPI thermal zone */
	512	status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
	513	ACPI_UINT32_MAX,
2263576c	514	intel_menlow_register_sensor, NULL, NULL, NULL);
cc0573b3 TS	515	if (ACPI_FAILURE(status))
	516	return -ENODEV;
	517
	518	return 0;
	519	}
	520
	521	static void __exit intel_menlow_module_exit(void)
	522	{
	523	acpi_bus_unregister_driver(&intel_menlow_memory_driver);
	524	intel_menlow_unregister_sensor();
	525	}
	526
	527	module_init(intel_menlow_module_init);
	528	module_exit(intel_menlow_module_exit);