2 * intel_menlow.c - Intel menlow Driver for thermal management extension
4 * Copyright (C) 2008 Intel Corp
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
36 #include <linux/types.h>
37 #include <linux/pci.h>
40 #include <linux/thermal.h>
41 #include <acpi/acpi_bus.h>
42 #include <acpi/acpi_drivers.h>
44 MODULE_AUTHOR("Thomas Sujith");
45 MODULE_AUTHOR("Zhang Rui");
46 MODULE_DESCRIPTION("Intel Menlow platform specific driver");
47 MODULE_LICENSE("GPL");
50 * Memory controller device control
53 #define MEMORY_GET_BANDWIDTH "GTHS"
54 #define MEMORY_SET_BANDWIDTH "STHS"
55 #define MEMORY_ARG_CUR_BANDWIDTH 1
56 #define MEMORY_ARG_MAX_BANDWIDTH 0
58 static void intel_menlow_unregister_sensor(void);
61 * GTHS returning 'n' would mean that [0,n-1] states are supported
62 * In that case max_cstate would be n-1
63 * GTHS returning '0' would mean that no bandwidth control states are supported
65 static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
66 unsigned long *max_state)
68 struct acpi_device *device = cdev->devdata;
69 acpi_handle handle = device->handle;
70 unsigned long long value;
71 struct acpi_object_list arg_list;
72 union acpi_object arg;
73 acpi_status status = AE_OK;
76 arg_list.pointer = &arg;
77 arg.type = ACPI_TYPE_INTEGER;
78 arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
79 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
81 if (ACPI_FAILURE(status))
87 *max_state = value - 1;
91 static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
94 struct acpi_device *device = cdev->devdata;
95 acpi_handle handle = device->handle;
96 unsigned long long result;
97 struct acpi_object_list arg_list;
98 union acpi_object arg;
99 acpi_status status = AE_OK;
102 arg_list.pointer = &arg;
103 arg.type = ACPI_TYPE_INTEGER;
104 arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
105 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
107 if (ACPI_FAILURE(status))
114 static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
117 struct acpi_device *device = cdev->devdata;
118 acpi_handle handle = device->handle;
119 struct acpi_object_list arg_list;
120 union acpi_object arg;
122 unsigned long long temp;
123 unsigned long max_state;
125 if (memory_get_max_bandwidth(cdev, &max_state))
128 if (state > max_state)
132 arg_list.pointer = &arg;
133 arg.type = ACPI_TYPE_INTEGER;
134 arg.integer.value = state;
137 acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
140 pr_info("Bandwidth value was %ld: status is %d\n", state, status);
141 if (ACPI_FAILURE(status))
147 static struct thermal_cooling_device_ops memory_cooling_ops = {
148 .get_max_state = memory_get_max_bandwidth,
149 .get_cur_state = memory_get_cur_bandwidth,
150 .set_cur_state = memory_set_cur_bandwidth,
154 * Memory Device Management
156 static int intel_menlow_memory_add(struct acpi_device *device)
158 int result = -ENODEV;
159 acpi_status status = AE_OK;
161 struct thermal_cooling_device *cdev;
166 status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy);
167 if (ACPI_FAILURE(status))
170 status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy);
171 if (ACPI_FAILURE(status))
174 cdev = thermal_cooling_device_register("Memory controller", device,
175 &memory_cooling_ops);
177 result = PTR_ERR(cdev);
181 device->driver_data = cdev;
182 result = sysfs_create_link(&device->dev.kobj,
183 &cdev->device.kobj, "thermal_cooling");
187 result = sysfs_create_link(&cdev->device.kobj,
188 &device->dev.kobj, "device");
190 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
198 thermal_cooling_device_unregister(cdev);
203 static int intel_menlow_memory_remove(struct acpi_device *device)
205 struct thermal_cooling_device *cdev = acpi_driver_data(device);
207 if (!device || !cdev)
210 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
211 sysfs_remove_link(&cdev->device.kobj, "device");
212 thermal_cooling_device_unregister(cdev);
217 static const struct acpi_device_id intel_menlow_memory_ids[] = {
222 static struct acpi_driver intel_menlow_memory_driver = {
223 .name = "intel_menlow_thermal_control",
224 .ids = intel_menlow_memory_ids,
226 .add = intel_menlow_memory_add,
227 .remove = intel_menlow_memory_remove,
232 * Sensor control on menlow platform
235 #define THERMAL_AUX0 0
236 #define THERMAL_AUX1 1
237 #define GET_AUX0 "GAX0"
238 #define GET_AUX1 "GAX1"
239 #define SET_AUX0 "SAX0"
240 #define SET_AUX1 "SAX1"
242 struct intel_menlow_attribute {
243 struct device_attribute attr;
244 struct device *device;
246 struct list_head node;
249 static LIST_HEAD(intel_menlow_attr_list);
250 static DEFINE_MUTEX(intel_menlow_attr_lock);
253 * sensor_get_auxtrip - get the current auxtrip value from sensor
254 * @name: Thermalzone name
255 * @auxtype : AUX0/AUX1
258 static int sensor_get_auxtrip(acpi_handle handle, int index,
259 unsigned long long *value)
263 if ((index != 0 && index != 1) || !value)
266 status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
268 if (ACPI_FAILURE(status))
275 * sensor_set_auxtrip - set the new auxtrip value to sensor
276 * @name: Thermalzone name
277 * @auxtype : AUX0/AUX1
280 static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
283 union acpi_object arg = {
286 struct acpi_object_list args = {
289 unsigned long long temp;
291 if (index != 0 && index != 1)
294 status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
296 if (ACPI_FAILURE(status))
298 if ((index && value < temp) || (!index && value > temp))
301 arg.integer.value = value;
302 status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
304 if (ACPI_FAILURE(status))
307 /* do we need to check the return value of SAX0/SAX1 ? */
312 #define to_intel_menlow_attr(_attr) \
313 container_of(_attr, struct intel_menlow_attribute, attr)
315 static ssize_t aux0_show(struct device *dev,
316 struct device_attribute *dev_attr, char *buf)
318 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
319 unsigned long long value;
322 result = sensor_get_auxtrip(attr->handle, 0, &value);
324 return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
327 static ssize_t aux1_show(struct device *dev,
328 struct device_attribute *dev_attr, char *buf)
330 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
331 unsigned long long value;
334 result = sensor_get_auxtrip(attr->handle, 1, &value);
336 return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
339 static ssize_t aux0_store(struct device *dev,
340 struct device_attribute *dev_attr,
341 const char *buf, size_t count)
343 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
347 /*Sanity check; should be a positive integer */
348 if (!sscanf(buf, "%d", &value))
354 result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
355 return result ? result : count;
358 static ssize_t aux1_store(struct device *dev,
359 struct device_attribute *dev_attr,
360 const char *buf, size_t count)
362 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
366 /*Sanity check; should be a positive integer */
367 if (!sscanf(buf, "%d", &value))
373 result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
374 return result ? result : count;
377 /* BIOS can enable/disable the thermal user application in dabney platform */
378 #define BIOS_ENABLED "\\_TZ.GSTS"
379 static ssize_t bios_enabled_show(struct device *dev,
380 struct device_attribute *attr, char *buf)
383 unsigned long long bios_enabled;
385 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
386 if (ACPI_FAILURE(status))
389 return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
392 static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show,
393 void *store, struct device *dev,
396 struct intel_menlow_attribute *attr;
399 attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
403 sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
404 attr->attr.attr.name = name;
405 attr->attr.attr.mode = mode;
406 attr->attr.show = show;
407 attr->attr.store = store;
409 attr->handle = handle;
411 result = device_create_file(dev, &attr->attr);
417 mutex_lock(&intel_menlow_attr_lock);
418 list_add_tail(&attr->node, &intel_menlow_attr_list);
419 mutex_unlock(&intel_menlow_attr_lock);
424 static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
425 void *context, void **rv)
429 struct thermal_zone_device *thermal;
432 result = acpi_bus_get_private_data(handle, (void **)&thermal);
436 /* _TZ must have the AUX0/1 methods */
437 status = acpi_get_handle(handle, GET_AUX0, &dummy);
438 if (ACPI_FAILURE(status))
439 return (status == AE_NOT_FOUND) ? AE_OK : status;
441 status = acpi_get_handle(handle, SET_AUX0, &dummy);
442 if (ACPI_FAILURE(status))
443 return (status == AE_NOT_FOUND) ? AE_OK : status;
445 result = intel_menlow_add_one_attribute("aux0", 0644,
446 aux0_show, aux0_store,
447 &thermal->device, handle);
451 status = acpi_get_handle(handle, GET_AUX1, &dummy);
452 if (ACPI_FAILURE(status))
455 status = acpi_get_handle(handle, SET_AUX1, &dummy);
456 if (ACPI_FAILURE(status))
459 result = intel_menlow_add_one_attribute("aux1", 0644,
460 aux1_show, aux1_store,
461 &thermal->device, handle);
463 intel_menlow_unregister_sensor();
468 * create the "dabney_enabled" attribute which means the user app
469 * should be loaded or not
472 result = intel_menlow_add_one_attribute("bios_enabled", 0444,
473 bios_enabled_show, NULL,
474 &thermal->device, handle);
476 intel_menlow_unregister_sensor();
483 if (status == AE_NOT_FOUND)
486 intel_menlow_unregister_sensor();
490 static void intel_menlow_unregister_sensor(void)
492 struct intel_menlow_attribute *pos, *next;
494 mutex_lock(&intel_menlow_attr_lock);
495 list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
496 list_del(&pos->node);
497 device_remove_file(pos->device, &pos->attr);
500 mutex_unlock(&intel_menlow_attr_lock);
505 static int __init intel_menlow_module_init(void)
507 int result = -ENODEV;
509 unsigned long long enable;
514 /* Looking for the \_TZ.GSTS method */
515 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
516 if (ACPI_FAILURE(status) || !enable)
519 /* Looking for ACPI device MEM0 with hardware id INT0002 */
520 result = acpi_bus_register_driver(&intel_menlow_memory_driver);
524 /* Looking for sensors in each ACPI thermal zone */
525 status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
527 intel_menlow_register_sensor, NULL, NULL, NULL);
528 if (ACPI_FAILURE(status)) {
529 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
536 static void __exit intel_menlow_module_exit(void)
538 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
539 intel_menlow_unregister_sensor();
542 module_init(intel_menlow_module_init);
543 module_exit(intel_menlow_module_exit);