[net-next-2.6.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/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);
	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>
	33	#include <linux/types.h>
	34	#include <linux/pci.h>
	35	#include <linux/pm.h>
	36
	37	#include <linux/thermal.h>
	38	#include <acpi/acpi_bus.h>
	39	#include <acpi/acpi_drivers.h>
	40
	41	MODULE_AUTHOR("Thomas Sujith");
	42	MODULE_AUTHOR("Zhang Rui");
	43	MODULE_DESCRIPTION("Intel Menlow platform specific driver");
	44	MODULE_LICENSE("GPL");
	45
	46	/*
	47	* Memory controller device control
	48	*/
	49
	50	#define MEMORY_GET_BANDWIDTH "GTHS"
	51	#define MEMORY_SET_BANDWIDTH "STHS"
	52	#define MEMORY_ARG_CUR_BANDWIDTH 1
	53	#define MEMORY_ARG_MAX_BANDWIDTH 0
	54
d65dcdcf TS	55	/*
	56	* GTHS returning 'n' would mean that [0,n-1] states are supported
	57	* In that case max_cstate would be n-1
	58	* GTHS returning '0' would mean that no bandwidth control states are supported
	59	*/
6503e5df MG	60	static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
6503e5df MG	61	unsigned long *max_state)
cc0573b3 TS	62	{
	63	struct acpi_device *device = cdev->devdata;
	64	acpi_handle handle = device->handle;
27663c58	65	unsigned long long value;
cc0573b3 TS	66	struct acpi_object_list arg_list;
	67	union acpi_object arg;
	68	acpi_status status = AE_OK;
	69
	70	arg_list.count = 1;
	71	arg_list.pointer = &arg;
	72	arg.type = ACPI_TYPE_INTEGER;
	73	arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
	74	status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
	75	&arg_list, &value);
	76	if (ACPI_FAILURE(status))
	77	return -EFAULT;
	78
c2d06fe3 ZR	79	if (!value)
	80	return -EINVAL;
	81
cc0573b3 TS	82	*max_state = value - 1;
	83	return 0;
	84	}
	85
cc0573b3	86	static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
6503e5df	87	unsigned long *value)
cc0573b3 TS	88	{
	89	struct acpi_device *device = cdev->devdata;
	90	acpi_handle handle = device->handle;
6503e5df	91	unsigned long long result;
cc0573b3 TS	92	struct acpi_object_list arg_list;
	93	union acpi_object arg;
	94	acpi_status status = AE_OK;
	95
	96	arg_list.count = 1;
	97	arg_list.pointer = &arg;
	98	arg.type = ACPI_TYPE_INTEGER;
	99	arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
	100	status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
6503e5df	101	&arg_list, &result);
cc0573b3 TS	102	if (ACPI_FAILURE(status))
	103	return -EFAULT;
	104
6503e5df MG	105	*value = result;
6503e5df MG	106	return 0;
cc0573b3 TS	107	}
	108
	109	static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
6503e5df	110	unsigned long state)
cc0573b3 TS	111	{
	112	struct acpi_device *device = cdev->devdata;
	113	acpi_handle handle = device->handle;
	114	struct acpi_object_list arg_list;
	115	union acpi_object arg;
	116	acpi_status status;
27663c58	117	unsigned long long temp;
cc0573b3 TS	118	unsigned long max_state;
cc0573b3 TS	119
6503e5df	120	if (memory_get_max_bandwidth(cdev, &max_state))
cc0573b3 TS	121	return -EFAULT;
cc0573b3 TS	122
c2d06fe3	123	if (state > max_state)
cc0573b3 TS	124	return -EINVAL;
	125
	126	arg_list.count = 1;
	127	arg_list.pointer = &arg;
	128	arg.type = ACPI_TYPE_INTEGER;
	129	arg.integer.value = state;
	130
	131	status =
	132	acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
27663c58	133	&temp);
cc0573b3 TS	134
cc0573b3 TS	135	printk(KERN_INFO
6503e5df	136	"Bandwidth value was %ld: status is %d\n", state, status);
cc0573b3 TS	137	if (ACPI_FAILURE(status))
	138	return -EFAULT;
	139
	140	return 0;
	141	}
	142
	143	static struct thermal_cooling_device_ops memory_cooling_ops = {
	144	.get_max_state = memory_get_max_bandwidth,
	145	.get_cur_state = memory_get_cur_bandwidth,
	146	.set_cur_state = memory_set_cur_bandwidth,
	147	};
	148
	149	/*
	150	* Memory Device Management
	151	*/
	152	static int intel_menlow_memory_add(struct acpi_device *device)
	153	{
	154	int result = -ENODEV;
	155	acpi_status status = AE_OK;
	156	acpi_handle dummy;
	157	struct thermal_cooling_device *cdev;
	158
	159	if (!device)
	160	return -EINVAL;
	161
	162	status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy);
	163	if (ACPI_FAILURE(status))
	164	goto end;
	165
	166	status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy);
	167	if (ACPI_FAILURE(status))
	168	goto end;
	169
	170	cdev = thermal_cooling_device_register("Memory controller", device,
	171	&memory_cooling_ops);
69f6b8dd TS	172	if (IS_ERR(cdev)) {
	173	result = PTR_ERR(cdev);
	174	goto end;
	175	}
	176
db89b4f0	177	device->driver_data = cdev;
3a8ca95e JL	178	result = sysfs_create_link(&device->dev.kobj,
	179	&cdev->device.kobj, "thermal_cooling");
	180	if (result)
	181	goto unregister;
	182
	183	result = sysfs_create_link(&cdev->device.kobj,
	184	&device->dev.kobj, "device");
	185	if (result) {
	186	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
	187	goto unregister;
cc0573b3 TS	188	}
	189
	190	end:
	191	return result;
	192
	193	unregister:
	194	thermal_cooling_device_unregister(cdev);
	195	return result;
	196
	197	}
	198
	199	static int intel_menlow_memory_remove(struct acpi_device *device, int type)
	200	{
	201	struct thermal_cooling_device *cdev = acpi_driver_data(device);
	202
	203	if (!device \|\| !cdev)
	204	return -EINVAL;
	205
	206	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
	207	sysfs_remove_link(&cdev->device.kobj, "device");
	208	thermal_cooling_device_unregister(cdev);
	209
	210	return 0;
	211	}
	212
f7e8dd50	213	static const struct acpi_device_id intel_menlow_memory_ids[] = {
cc0573b3 TS	214	{"INT0002", 0},
	215	{"", 0},
	216	};
	217
	218	static struct acpi_driver intel_menlow_memory_driver = {
	219	.name = "intel_menlow_thermal_control",
	220	.ids = intel_menlow_memory_ids,
	221	.ops = {
	222	.add = intel_menlow_memory_add,
	223	.remove = intel_menlow_memory_remove,
	224	},
	225	};
	226
	227	/*
	228	* Sensor control on menlow platform
	229	*/
	230
	231	#define THERMAL_AUX0 0
	232	#define THERMAL_AUX1 1
	233	#define GET_AUX0 "GAX0"
	234	#define GET_AUX1 "GAX1"
	235	#define SET_AUX0 "SAX0"
	236	#define SET_AUX1 "SAX1"
	237
	238	struct intel_menlow_attribute {
	239	struct device_attribute attr;
	240	struct device *device;
	241	acpi_handle handle;
	242	struct list_head node;
	243	};
	244
	245	static LIST_HEAD(intel_menlow_attr_list);
	246	static DEFINE_MUTEX(intel_menlow_attr_lock);
	247
	248	/*
	249	* sensor_get_auxtrip - get the current auxtrip value from sensor
	250	* @name: Thermalzone name
	251	* @auxtype : AUX0/AUX1
	252	* @buf: syfs buffer
	253	*/
27663c58 MW	254	static int sensor_get_auxtrip(acpi_handle handle, int index,
27663c58 MW	255	unsigned long long *value)
cc0573b3 TS	256	{
	257	acpi_status status;
	258
	259	if ((index != 0 && index != 1) \|\| !value)
	260	return -EINVAL;
	261
	262	status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
27663c58	263	NULL, value);
cc0573b3 TS	264	if (ACPI_FAILURE(status))
	265	return -EIO;
	266
	267	return 0;
	268	}
	269
	270	/*
	271	* sensor_set_auxtrip - set the new auxtrip value to sensor
	272	* @name: Thermalzone name
	273	* @auxtype : AUX0/AUX1
	274	* @buf: syfs buffer
	275	*/
	276	static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
	277	{
	278	acpi_status status;
	279	union acpi_object arg = {
	280	ACPI_TYPE_INTEGER
	281	};
	282	struct acpi_object_list args = {
	283	1, &arg
	284	};
27663c58	285	unsigned long long temp;
cc0573b3 TS	286
	287	if (index != 0 && index != 1)
	288	return -EINVAL;
	289
	290	status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
27663c58	291	NULL, &temp);
cc0573b3 TS	292	if (ACPI_FAILURE(status))
	293	return -EIO;
	294	if ((index && value < temp) \|\| (!index && value > temp))
	295	return -EINVAL;
	296
	297	arg.integer.value = value;
	298	status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
27663c58	299	&args, &temp);
cc0573b3 TS	300	if (ACPI_FAILURE(status))
	301	return -EIO;
	302
	303	/* do we need to check the return value of SAX0/SAX1 ? */
	304
	305	return 0;
	306	}
	307
	308	#define to_intel_menlow_attr(_attr) \
	309	container_of(_attr, struct intel_menlow_attribute, attr)
	310
	311	static ssize_t aux0_show(struct device *dev,
	312	struct device_attribute dev_attr, char buf)
	313	{
	314	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
27663c58	315	unsigned long long value;
cc0573b3 TS	316	int result;
	317
	318	result = sensor_get_auxtrip(attr->handle, 0, &value);
	319
	320	return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
	321	}
	322
	323	static ssize_t aux1_show(struct device *dev,
	324	struct device_attribute dev_attr, char buf)
	325	{
	326	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
27663c58	327	unsigned long long value;
cc0573b3 TS	328	int result;
	329
	330	result = sensor_get_auxtrip(attr->handle, 1, &value);
	331
	332	return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
	333	}
	334
	335	static ssize_t aux0_store(struct device *dev,
	336	struct device_attribute *dev_attr,
	337	const char *buf, size_t count)
	338	{
	339	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	340	int value;
	341	int result;
	342
	343	/Sanity check; should be a positive integer /
	344	if (!sscanf(buf, "%d", &value))
	345	return -EINVAL;
	346
	347	if (value < 0)
	348	return -EINVAL;
	349
	350	result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
	351	return result ? result : count;
	352	}
	353
	354	static ssize_t aux1_store(struct device *dev,
	355	struct device_attribute *dev_attr,
	356	const char *buf, size_t count)
	357	{
	358	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	359	int value;
	360	int result;
	361
	362	/Sanity check; should be a positive integer /
	363	if (!sscanf(buf, "%d", &value))
	364	return -EINVAL;
	365
	366	if (value < 0)
	367	return -EINVAL;
	368
	369	result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
	370	return result ? result : count;
	371	}
	372
	373	/* BIOS can enable/disable the thermal user application in dabney platform */
	374	#define BIOS_ENABLED "\\_TZ.GSTS"
	375	static ssize_t bios_enabled_show(struct device *dev,
	376	struct device_attribute attr, char buf)
	377	{
	378	acpi_status status;
27663c58	379	unsigned long long bios_enabled;
cc0573b3 TS	380
	381	status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
	382	if (ACPI_FAILURE(status))
	383	return -ENODEV;
	384
	385	return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
	386	}
	387
	388	static int intel_menlow_add_one_attribute(char name, int mode, void show,
	389	void store, struct device dev,
	390	acpi_handle handle)
	391	{
	392	struct intel_menlow_attribute *attr;
	393	int result;
	394
	395	attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
	396	if (!attr)
	397	return -ENOMEM;
	398
	399	attr->attr.attr.name = name;
	400	attr->attr.attr.mode = mode;
	401	attr->attr.show = show;
	402	attr->attr.store = store;
	403	attr->device = dev;
	404	attr->handle = handle;
	405
	406	result = device_create_file(dev, &attr->attr);
	407	if (result)
	408	return result;
	409
	410	mutex_lock(&intel_menlow_attr_lock);
	411	list_add_tail(&attr->node, &intel_menlow_attr_list);
	412	mutex_unlock(&intel_menlow_attr_lock);
	413
	414	return 0;
	415	}
	416
	417	static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
	418	void context, void *rv)
	419	{
	420	acpi_status status;
	421	acpi_handle dummy;
	422	struct thermal_zone_device *thermal;
	423	int result;
	424
	425	result = acpi_bus_get_private_data(handle, (void **)&thermal);
	426	if (result)
	427	return 0;
	428
	429	/* _TZ must have the AUX0/1 methods */
	430	status = acpi_get_handle(handle, GET_AUX0, &dummy);
	431	if (ACPI_FAILURE(status))
	432	goto not_found;
	433
	434	status = acpi_get_handle(handle, SET_AUX0, &dummy);
	435	if (ACPI_FAILURE(status))
	436	goto not_found;
	437
	438	result = intel_menlow_add_one_attribute("aux0", 0644,
	439	aux0_show, aux0_store,
	440	&thermal->device, handle);
	441	if (result)
	442	return AE_ERROR;
	443
444	status = acpi_get_handle(handle, GET_AUX1, &dummy);
445	if (ACPI_FAILURE(status))
446	goto not_found;
447
448	status = acpi_get_handle(handle, SET_AUX1, &dummy);
449	if (ACPI_FAILURE(status))
450	goto not_found;
451
452	result = intel_menlow_add_one_attribute("aux1", 0644,
453	aux1_show, aux1_store,
454	&thermal->device, handle);
455	if (result)
456	return AE_ERROR;
457
458	/*
459	* create the "dabney_enabled" attribute which means the user app
460	* should be loaded or not
461	*/
462
463	result = intel_menlow_add_one_attribute("bios_enabled", 0444,
464	bios_enabled_show, NULL,
465	&thermal->device, handle);
466	if (result)
467	return AE_ERROR;
468
469	not_found:
470	if (status == AE_NOT_FOUND)
471	return AE_OK;
472	else
473	return status;
474	}
475
476	static void intel_menlow_unregister_sensor(void)
477	{
478	struct intel_menlow_attribute pos, next;
479
480	mutex_lock(&intel_menlow_attr_lock);
481	list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
482	list_del(&pos->node);
483	device_remove_file(pos->device, &pos->attr);
484	kfree(pos);
485	}
486	mutex_unlock(&intel_menlow_attr_lock);
487
488	return;
489	}
490
491	static int __init intel_menlow_module_init(void)
492	{
493	int result = -ENODEV;
494	acpi_status status;
27663c58	495	unsigned long long enable;
cc0573b3 TS	496
	497	if (acpi_disabled)
	498	return result;
	499
	500	/* Looking for the \_TZ.GSTS method */
	501	status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
	502	if (ACPI_FAILURE(status) \|\| !enable)
	503	return -ENODEV;
	504
	505	/* Looking for ACPI device MEM0 with hardware id INT0002 */
	506	result = acpi_bus_register_driver(&intel_menlow_memory_driver);
	507	if (result)
	508	return result;
	509
	510	/* Looking for sensors in each ACPI thermal zone */
	511	status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
	512	ACPI_UINT32_MAX,
	513	intel_menlow_register_sensor, NULL, NULL);
	514	if (ACPI_FAILURE(status))
	515	return -ENODEV;
	516
	517	return 0;
	518	}
	519
	520	static void __exit intel_menlow_module_exit(void)
	521	{
	522	acpi_bus_unregister_driver(&intel_menlow_memory_driver);
	523	intel_menlow_unregister_sensor();
	524	}
	525
	526	module_init(intel_menlow_module_init);
	527	module_exit(intel_menlow_module_exit);