1 // SPDX-License-Identifier: GPL-2.0
3 * Intel menlow Driver for thermal management extension
5 * Copyright (C) 2008 Intel Corp
9 * This driver creates the sys I/F for programming the sensors.
10 * It also implements the driver for intel menlow memory controller (hardware
11 * id is INT0002) which makes use of the platform specific ACPI methods
12 * to get/set bandwidth.
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17 #include <linux/acpi.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/pci.h>
22 #include <linux/slab.h>
23 #include <linux/thermal.h>
24 #include <linux/types.h>
25 #include <linux/units.h>
27 MODULE_AUTHOR("Thomas Sujith");
28 MODULE_AUTHOR("Zhang Rui");
29 MODULE_DESCRIPTION("Intel Menlow platform specific driver");
30 MODULE_LICENSE("GPL v2");
33 * Memory controller device control
36 #define MEMORY_GET_BANDWIDTH "GTHS"
37 #define MEMORY_SET_BANDWIDTH "STHS"
38 #define MEMORY_ARG_CUR_BANDWIDTH 1
39 #define MEMORY_ARG_MAX_BANDWIDTH 0
41 static void intel_menlow_unregister_sensor(void);
44 * GTHS returning 'n' would mean that [0,n-1] states are supported
45 * In that case max_cstate would be n-1
46 * GTHS returning '0' would mean that no bandwidth control states are supported
48 static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
49 unsigned long *max_state)
51 struct acpi_device *device = cdev->devdata;
52 acpi_handle handle = device->handle;
53 unsigned long long value;
54 struct acpi_object_list arg_list;
55 union acpi_object arg;
56 acpi_status status = AE_OK;
59 arg_list.pointer = &arg;
60 arg.type = ACPI_TYPE_INTEGER;
61 arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
62 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
64 if (ACPI_FAILURE(status))
70 *max_state = value - 1;
74 static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
77 struct acpi_device *device = cdev->devdata;
78 acpi_handle handle = device->handle;
79 unsigned long long result;
80 struct acpi_object_list arg_list;
81 union acpi_object arg;
82 acpi_status status = AE_OK;
85 arg_list.pointer = &arg;
86 arg.type = ACPI_TYPE_INTEGER;
87 arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
88 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
90 if (ACPI_FAILURE(status))
97 static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
100 struct acpi_device *device = cdev->devdata;
101 acpi_handle handle = device->handle;
102 struct acpi_object_list arg_list;
103 union acpi_object arg;
105 unsigned long long temp;
106 unsigned long max_state;
108 if (memory_get_max_bandwidth(cdev, &max_state))
111 if (state > max_state)
115 arg_list.pointer = &arg;
116 arg.type = ACPI_TYPE_INTEGER;
117 arg.integer.value = state;
120 acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
123 pr_info("Bandwidth value was %ld: status is %d\n", state, status);
124 if (ACPI_FAILURE(status))
130 static const struct thermal_cooling_device_ops memory_cooling_ops = {
131 .get_max_state = memory_get_max_bandwidth,
132 .get_cur_state = memory_get_cur_bandwidth,
133 .set_cur_state = memory_set_cur_bandwidth,
137 * Memory Device Management
139 static int intel_menlow_memory_add(struct acpi_device *device)
141 int result = -ENODEV;
142 struct thermal_cooling_device *cdev;
147 if (!acpi_has_method(device->handle, MEMORY_GET_BANDWIDTH))
150 if (!acpi_has_method(device->handle, MEMORY_SET_BANDWIDTH))
153 cdev = thermal_cooling_device_register("Memory controller", device,
154 &memory_cooling_ops);
156 result = PTR_ERR(cdev);
160 device->driver_data = cdev;
161 result = sysfs_create_link(&device->dev.kobj,
162 &cdev->device.kobj, "thermal_cooling");
166 result = sysfs_create_link(&cdev->device.kobj,
167 &device->dev.kobj, "device");
169 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
177 thermal_cooling_device_unregister(cdev);
182 static void intel_menlow_memory_remove(struct acpi_device *device)
184 struct thermal_cooling_device *cdev;
189 cdev = acpi_driver_data(device);
193 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
194 sysfs_remove_link(&cdev->device.kobj, "device");
195 thermal_cooling_device_unregister(cdev);
198 static const struct acpi_device_id intel_menlow_memory_ids[] = {
203 static struct acpi_driver intel_menlow_memory_driver = {
204 .name = "intel_menlow_thermal_control",
205 .ids = intel_menlow_memory_ids,
207 .add = intel_menlow_memory_add,
208 .remove = intel_menlow_memory_remove,
213 * Sensor control on menlow platform
216 #define THERMAL_AUX0 0
217 #define THERMAL_AUX1 1
218 #define GET_AUX0 "GAX0"
219 #define GET_AUX1 "GAX1"
220 #define SET_AUX0 "SAX0"
221 #define SET_AUX1 "SAX1"
223 struct intel_menlow_attribute {
224 struct device_attribute attr;
225 struct device *device;
227 struct list_head node;
230 static LIST_HEAD(intel_menlow_attr_list);
231 static DEFINE_MUTEX(intel_menlow_attr_lock);
234 * sensor_get_auxtrip - get the current auxtrip value from sensor
235 * @handle: Object handle
236 * @index : GET_AUX1/GET_AUX0
237 * @value : The address will be fill by the value
239 static int sensor_get_auxtrip(acpi_handle handle, int index,
240 unsigned long long *value)
244 if ((index != 0 && index != 1) || !value)
247 status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
249 if (ACPI_FAILURE(status))
256 * sensor_set_auxtrip - set the new auxtrip value to sensor
257 * @handle: Object handle
258 * @index : GET_AUX1/GET_AUX0
259 * @value : The value will be set
261 static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
264 union acpi_object arg = {
267 struct acpi_object_list args = {
270 unsigned long long temp;
272 if (index != 0 && index != 1)
275 status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
277 if (ACPI_FAILURE(status))
279 if ((index && value < temp) || (!index && value > temp))
282 arg.integer.value = value;
283 status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
285 if (ACPI_FAILURE(status))
288 /* do we need to check the return value of SAX0/SAX1 ? */
293 #define to_intel_menlow_attr(_attr) \
294 container_of(_attr, struct intel_menlow_attribute, attr)
296 static ssize_t aux_show(struct device *dev, struct device_attribute *dev_attr,
299 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
300 unsigned long long value;
303 result = sensor_get_auxtrip(attr->handle, idx, &value);
307 return sprintf(buf, "%lu", deci_kelvin_to_celsius(value));
310 static ssize_t aux0_show(struct device *dev,
311 struct device_attribute *dev_attr, char *buf)
313 return aux_show(dev, dev_attr, buf, 0);
316 static ssize_t aux1_show(struct device *dev,
317 struct device_attribute *dev_attr, char *buf)
319 return aux_show(dev, dev_attr, buf, 1);
322 static ssize_t aux_store(struct device *dev, struct device_attribute *dev_attr,
323 const char *buf, size_t count, int idx)
325 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
329 /*Sanity check; should be a positive integer */
330 if (!sscanf(buf, "%d", &value))
336 result = sensor_set_auxtrip(attr->handle, idx,
337 celsius_to_deci_kelvin(value));
338 return result ? result : count;
341 static ssize_t aux0_store(struct device *dev,
342 struct device_attribute *dev_attr,
343 const char *buf, size_t count)
345 return aux_store(dev, dev_attr, buf, count, 0);
348 static ssize_t aux1_store(struct device *dev,
349 struct device_attribute *dev_attr,
350 const char *buf, size_t count)
352 return aux_store(dev, dev_attr, buf, count, 1);
355 /* BIOS can enable/disable the thermal user application in dabney platform */
356 #define BIOS_ENABLED "\\_TZ.GSTS"
357 static ssize_t bios_enabled_show(struct device *dev,
358 struct device_attribute *attr, char *buf)
361 unsigned long long bios_enabled;
363 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
364 if (ACPI_FAILURE(status))
367 return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
370 static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show,
371 void *store, struct device *dev,
374 struct intel_menlow_attribute *attr;
377 attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
381 sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
382 attr->attr.attr.name = name;
383 attr->attr.attr.mode = mode;
384 attr->attr.show = show;
385 attr->attr.store = store;
387 attr->handle = handle;
389 result = device_create_file(dev, &attr->attr);
395 mutex_lock(&intel_menlow_attr_lock);
396 list_add_tail(&attr->node, &intel_menlow_attr_list);
397 mutex_unlock(&intel_menlow_attr_lock);
402 static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
403 void *context, void **rv)
407 struct thermal_zone_device *thermal;
410 result = acpi_bus_get_private_data(handle, (void **)&thermal);
414 /* _TZ must have the AUX0/1 methods */
415 status = acpi_get_handle(handle, GET_AUX0, &dummy);
416 if (ACPI_FAILURE(status))
417 return (status == AE_NOT_FOUND) ? AE_OK : status;
419 status = acpi_get_handle(handle, SET_AUX0, &dummy);
420 if (ACPI_FAILURE(status))
421 return (status == AE_NOT_FOUND) ? AE_OK : status;
423 result = intel_menlow_add_one_attribute("aux0", 0644,
424 aux0_show, aux0_store,
425 &thermal->device, handle);
429 status = acpi_get_handle(handle, GET_AUX1, &dummy);
430 if (ACPI_FAILURE(status))
433 status = acpi_get_handle(handle, SET_AUX1, &dummy);
434 if (ACPI_FAILURE(status))
437 result = intel_menlow_add_one_attribute("aux1", 0644,
438 aux1_show, aux1_store,
439 &thermal->device, handle);
441 intel_menlow_unregister_sensor();
446 * create the "dabney_enabled" attribute which means the user app
447 * should be loaded or not
450 result = intel_menlow_add_one_attribute("bios_enabled", 0444,
451 bios_enabled_show, NULL,
452 &thermal->device, handle);
454 intel_menlow_unregister_sensor();
461 if (status == AE_NOT_FOUND)
464 intel_menlow_unregister_sensor();
468 static void intel_menlow_unregister_sensor(void)
470 struct intel_menlow_attribute *pos, *next;
472 mutex_lock(&intel_menlow_attr_lock);
473 list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
474 list_del(&pos->node);
475 device_remove_file(pos->device, &pos->attr);
478 mutex_unlock(&intel_menlow_attr_lock);
483 static int __init intel_menlow_module_init(void)
485 int result = -ENODEV;
487 unsigned long long enable;
492 /* Looking for the \_TZ.GSTS method */
493 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
494 if (ACPI_FAILURE(status) || !enable)
497 /* Looking for ACPI device MEM0 with hardware id INT0002 */
498 result = acpi_bus_register_driver(&intel_menlow_memory_driver);
502 /* Looking for sensors in each ACPI thermal zone */
503 status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
505 intel_menlow_register_sensor, NULL, NULL, NULL);
506 if (ACPI_FAILURE(status)) {
507 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
514 static void __exit intel_menlow_module_exit(void)
516 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
517 intel_menlow_unregister_sensor();
520 module_init(intel_menlow_module_init);
521 module_exit(intel_menlow_module_exit);