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 int 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);
200 static const struct acpi_device_id intel_menlow_memory_ids[] = {
205 static struct acpi_driver intel_menlow_memory_driver = {
206 .name = "intel_menlow_thermal_control",
207 .ids = intel_menlow_memory_ids,
209 .add = intel_menlow_memory_add,
210 .remove = intel_menlow_memory_remove,
215 * Sensor control on menlow platform
218 #define THERMAL_AUX0 0
219 #define THERMAL_AUX1 1
220 #define GET_AUX0 "GAX0"
221 #define GET_AUX1 "GAX1"
222 #define SET_AUX0 "SAX0"
223 #define SET_AUX1 "SAX1"
225 struct intel_menlow_attribute {
226 struct device_attribute attr;
227 struct device *device;
229 struct list_head node;
232 static LIST_HEAD(intel_menlow_attr_list);
233 static DEFINE_MUTEX(intel_menlow_attr_lock);
236 * sensor_get_auxtrip - get the current auxtrip value from sensor
237 * @name: Thermalzone name
238 * @auxtype : AUX0/AUX1
241 static int sensor_get_auxtrip(acpi_handle handle, int index,
242 unsigned long long *value)
246 if ((index != 0 && index != 1) || !value)
249 status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
251 if (ACPI_FAILURE(status))
258 * sensor_set_auxtrip - set the new auxtrip value to sensor
259 * @name: Thermalzone name
260 * @auxtype : AUX0/AUX1
263 static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
266 union acpi_object arg = {
269 struct acpi_object_list args = {
272 unsigned long long temp;
274 if (index != 0 && index != 1)
277 status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
279 if (ACPI_FAILURE(status))
281 if ((index && value < temp) || (!index && value > temp))
284 arg.integer.value = value;
285 status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
287 if (ACPI_FAILURE(status))
290 /* do we need to check the return value of SAX0/SAX1 ? */
295 #define to_intel_menlow_attr(_attr) \
296 container_of(_attr, struct intel_menlow_attribute, attr)
298 static ssize_t aux_show(struct device *dev, struct device_attribute *dev_attr,
301 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
302 unsigned long long value;
305 result = sensor_get_auxtrip(attr->handle, idx, &value);
309 return sprintf(buf, "%lu", deci_kelvin_to_celsius(value));
312 static ssize_t aux0_show(struct device *dev,
313 struct device_attribute *dev_attr, char *buf)
315 return aux_show(dev, dev_attr, buf, 0);
318 static ssize_t aux1_show(struct device *dev,
319 struct device_attribute *dev_attr, char *buf)
321 return aux_show(dev, dev_attr, buf, 1);
324 static ssize_t aux_store(struct device *dev, struct device_attribute *dev_attr,
325 const char *buf, size_t count, int idx)
327 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
331 /*Sanity check; should be a positive integer */
332 if (!sscanf(buf, "%d", &value))
338 result = sensor_set_auxtrip(attr->handle, idx,
339 celsius_to_deci_kelvin(value));
340 return result ? result : count;
343 static ssize_t aux0_store(struct device *dev,
344 struct device_attribute *dev_attr,
345 const char *buf, size_t count)
347 return aux_store(dev, dev_attr, buf, count, 0);
350 static ssize_t aux1_store(struct device *dev,
351 struct device_attribute *dev_attr,
352 const char *buf, size_t count)
354 return aux_store(dev, dev_attr, buf, count, 1);
357 /* BIOS can enable/disable the thermal user application in dabney platform */
358 #define BIOS_ENABLED "\\_TZ.GSTS"
359 static ssize_t bios_enabled_show(struct device *dev,
360 struct device_attribute *attr, char *buf)
363 unsigned long long bios_enabled;
365 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
366 if (ACPI_FAILURE(status))
369 return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
372 static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show,
373 void *store, struct device *dev,
376 struct intel_menlow_attribute *attr;
379 attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
383 sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
384 attr->attr.attr.name = name;
385 attr->attr.attr.mode = mode;
386 attr->attr.show = show;
387 attr->attr.store = store;
389 attr->handle = handle;
391 result = device_create_file(dev, &attr->attr);
397 mutex_lock(&intel_menlow_attr_lock);
398 list_add_tail(&attr->node, &intel_menlow_attr_list);
399 mutex_unlock(&intel_menlow_attr_lock);
404 static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
405 void *context, void **rv)
409 struct thermal_zone_device *thermal;
412 result = acpi_bus_get_private_data(handle, (void **)&thermal);
416 /* _TZ must have the AUX0/1 methods */
417 status = acpi_get_handle(handle, GET_AUX0, &dummy);
418 if (ACPI_FAILURE(status))
419 return (status == AE_NOT_FOUND) ? AE_OK : status;
421 status = acpi_get_handle(handle, SET_AUX0, &dummy);
422 if (ACPI_FAILURE(status))
423 return (status == AE_NOT_FOUND) ? AE_OK : status;
425 result = intel_menlow_add_one_attribute("aux0", 0644,
426 aux0_show, aux0_store,
427 &thermal->device, handle);
431 status = acpi_get_handle(handle, GET_AUX1, &dummy);
432 if (ACPI_FAILURE(status))
435 status = acpi_get_handle(handle, SET_AUX1, &dummy);
436 if (ACPI_FAILURE(status))
439 result = intel_menlow_add_one_attribute("aux1", 0644,
440 aux1_show, aux1_store,
441 &thermal->device, handle);
443 intel_menlow_unregister_sensor();
448 * create the "dabney_enabled" attribute which means the user app
449 * should be loaded or not
452 result = intel_menlow_add_one_attribute("bios_enabled", 0444,
453 bios_enabled_show, NULL,
454 &thermal->device, handle);
456 intel_menlow_unregister_sensor();
463 if (status == AE_NOT_FOUND)
466 intel_menlow_unregister_sensor();
470 static void intel_menlow_unregister_sensor(void)
472 struct intel_menlow_attribute *pos, *next;
474 mutex_lock(&intel_menlow_attr_lock);
475 list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
476 list_del(&pos->node);
477 device_remove_file(pos->device, &pos->attr);
480 mutex_unlock(&intel_menlow_attr_lock);
485 static int __init intel_menlow_module_init(void)
487 int result = -ENODEV;
489 unsigned long long enable;
494 /* Looking for the \_TZ.GSTS method */
495 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
496 if (ACPI_FAILURE(status) || !enable)
499 /* Looking for ACPI device MEM0 with hardware id INT0002 */
500 result = acpi_bus_register_driver(&intel_menlow_memory_driver);
504 /* Looking for sensors in each ACPI thermal zone */
505 status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
507 intel_menlow_register_sensor, NULL, NULL, NULL);
508 if (ACPI_FAILURE(status)) {
509 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
516 static void __exit intel_menlow_module_exit(void)
518 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
519 intel_menlow_unregister_sensor();
522 module_init(intel_menlow_module_init);
523 module_exit(intel_menlow_module_exit);