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>
26 MODULE_AUTHOR("Thomas Sujith");
27 MODULE_AUTHOR("Zhang Rui");
28 MODULE_DESCRIPTION("Intel Menlow platform specific driver");
29 MODULE_LICENSE("GPL v2");
32 * Memory controller device control
35 #define MEMORY_GET_BANDWIDTH "GTHS"
36 #define MEMORY_SET_BANDWIDTH "STHS"
37 #define MEMORY_ARG_CUR_BANDWIDTH 1
38 #define MEMORY_ARG_MAX_BANDWIDTH 0
40 static void intel_menlow_unregister_sensor(void);
43 * GTHS returning 'n' would mean that [0,n-1] states are supported
44 * In that case max_cstate would be n-1
45 * GTHS returning '0' would mean that no bandwidth control states are supported
47 static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
48 unsigned long *max_state)
50 struct acpi_device *device = cdev->devdata;
51 acpi_handle handle = device->handle;
52 unsigned long long value;
53 struct acpi_object_list arg_list;
54 union acpi_object arg;
55 acpi_status status = AE_OK;
58 arg_list.pointer = &arg;
59 arg.type = ACPI_TYPE_INTEGER;
60 arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
61 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
63 if (ACPI_FAILURE(status))
69 *max_state = value - 1;
73 static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
76 struct acpi_device *device = cdev->devdata;
77 acpi_handle handle = device->handle;
78 unsigned long long result;
79 struct acpi_object_list arg_list;
80 union acpi_object arg;
81 acpi_status status = AE_OK;
84 arg_list.pointer = &arg;
85 arg.type = ACPI_TYPE_INTEGER;
86 arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
87 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
89 if (ACPI_FAILURE(status))
96 static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
99 struct acpi_device *device = cdev->devdata;
100 acpi_handle handle = device->handle;
101 struct acpi_object_list arg_list;
102 union acpi_object arg;
104 unsigned long long temp;
105 unsigned long max_state;
107 if (memory_get_max_bandwidth(cdev, &max_state))
110 if (state > max_state)
114 arg_list.pointer = &arg;
115 arg.type = ACPI_TYPE_INTEGER;
116 arg.integer.value = state;
119 acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
122 pr_info("Bandwidth value was %ld: status is %d\n", state, status);
123 if (ACPI_FAILURE(status))
129 static const struct thermal_cooling_device_ops memory_cooling_ops = {
130 .get_max_state = memory_get_max_bandwidth,
131 .get_cur_state = memory_get_cur_bandwidth,
132 .set_cur_state = memory_set_cur_bandwidth,
136 * Memory Device Management
138 static int intel_menlow_memory_add(struct acpi_device *device)
140 int result = -ENODEV;
141 struct thermal_cooling_device *cdev;
146 if (!acpi_has_method(device->handle, MEMORY_GET_BANDWIDTH))
149 if (!acpi_has_method(device->handle, MEMORY_SET_BANDWIDTH))
152 cdev = thermal_cooling_device_register("Memory controller", device,
153 &memory_cooling_ops);
155 result = PTR_ERR(cdev);
159 device->driver_data = cdev;
160 result = sysfs_create_link(&device->dev.kobj,
161 &cdev->device.kobj, "thermal_cooling");
165 result = sysfs_create_link(&cdev->device.kobj,
166 &device->dev.kobj, "device");
168 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
176 thermal_cooling_device_unregister(cdev);
181 static int intel_menlow_memory_remove(struct acpi_device *device)
183 struct thermal_cooling_device *cdev = acpi_driver_data(device);
185 if (!device || !cdev)
188 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
189 sysfs_remove_link(&cdev->device.kobj, "device");
190 thermal_cooling_device_unregister(cdev);
195 static const struct acpi_device_id intel_menlow_memory_ids[] = {
200 static struct acpi_driver intel_menlow_memory_driver = {
201 .name = "intel_menlow_thermal_control",
202 .ids = intel_menlow_memory_ids,
204 .add = intel_menlow_memory_add,
205 .remove = intel_menlow_memory_remove,
210 * Sensor control on menlow platform
213 #define THERMAL_AUX0 0
214 #define THERMAL_AUX1 1
215 #define GET_AUX0 "GAX0"
216 #define GET_AUX1 "GAX1"
217 #define SET_AUX0 "SAX0"
218 #define SET_AUX1 "SAX1"
220 struct intel_menlow_attribute {
221 struct device_attribute attr;
222 struct device *device;
224 struct list_head node;
227 static LIST_HEAD(intel_menlow_attr_list);
228 static DEFINE_MUTEX(intel_menlow_attr_lock);
231 * sensor_get_auxtrip - get the current auxtrip value from sensor
232 * @name: Thermalzone name
233 * @auxtype : AUX0/AUX1
236 static int sensor_get_auxtrip(acpi_handle handle, int index,
237 unsigned long long *value)
241 if ((index != 0 && index != 1) || !value)
244 status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
246 if (ACPI_FAILURE(status))
253 * sensor_set_auxtrip - set the new auxtrip value to sensor
254 * @name: Thermalzone name
255 * @auxtype : AUX0/AUX1
258 static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
261 union acpi_object arg = {
264 struct acpi_object_list args = {
267 unsigned long long temp;
269 if (index != 0 && index != 1)
272 status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
274 if (ACPI_FAILURE(status))
276 if ((index && value < temp) || (!index && value > temp))
279 arg.integer.value = value;
280 status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
282 if (ACPI_FAILURE(status))
285 /* do we need to check the return value of SAX0/SAX1 ? */
290 #define to_intel_menlow_attr(_attr) \
291 container_of(_attr, struct intel_menlow_attribute, attr)
293 static ssize_t aux_show(struct device *dev, struct device_attribute *dev_attr,
296 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
297 unsigned long long value;
300 result = sensor_get_auxtrip(attr->handle, idx, &value);
302 return result ? result : sprintf(buf, "%lu", DECI_KELVIN_TO_CELSIUS(value));
305 static ssize_t aux0_show(struct device *dev,
306 struct device_attribute *dev_attr, char *buf)
308 return aux_show(dev, dev_attr, buf, 0);
311 static ssize_t aux1_show(struct device *dev,
312 struct device_attribute *dev_attr, char *buf)
314 return aux_show(dev, dev_attr, buf, 1);
317 static ssize_t aux_store(struct device *dev, struct device_attribute *dev_attr,
318 const char *buf, size_t count, int idx)
320 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
324 /*Sanity check; should be a positive integer */
325 if (!sscanf(buf, "%d", &value))
331 result = sensor_set_auxtrip(attr->handle, idx,
332 CELSIUS_TO_DECI_KELVIN(value));
333 return result ? result : count;
336 static ssize_t aux0_store(struct device *dev,
337 struct device_attribute *dev_attr,
338 const char *buf, size_t count)
340 return aux_store(dev, dev_attr, buf, count, 0);
343 static ssize_t aux1_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, 1);
350 /* BIOS can enable/disable the thermal user application in dabney platform */
351 #define BIOS_ENABLED "\\_TZ.GSTS"
352 static ssize_t bios_enabled_show(struct device *dev,
353 struct device_attribute *attr, char *buf)
356 unsigned long long bios_enabled;
358 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
359 if (ACPI_FAILURE(status))
362 return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
365 static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show,
366 void *store, struct device *dev,
369 struct intel_menlow_attribute *attr;
372 attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
376 sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
377 attr->attr.attr.name = name;
378 attr->attr.attr.mode = mode;
379 attr->attr.show = show;
380 attr->attr.store = store;
382 attr->handle = handle;
384 result = device_create_file(dev, &attr->attr);
390 mutex_lock(&intel_menlow_attr_lock);
391 list_add_tail(&attr->node, &intel_menlow_attr_list);
392 mutex_unlock(&intel_menlow_attr_lock);
397 static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
398 void *context, void **rv)
402 struct thermal_zone_device *thermal;
405 result = acpi_bus_get_private_data(handle, (void **)&thermal);
409 /* _TZ must have the AUX0/1 methods */
410 status = acpi_get_handle(handle, GET_AUX0, &dummy);
411 if (ACPI_FAILURE(status))
412 return (status == AE_NOT_FOUND) ? AE_OK : status;
414 status = acpi_get_handle(handle, SET_AUX0, &dummy);
415 if (ACPI_FAILURE(status))
416 return (status == AE_NOT_FOUND) ? AE_OK : status;
418 result = intel_menlow_add_one_attribute("aux0", 0644,
419 aux0_show, aux0_store,
420 &thermal->device, handle);
424 status = acpi_get_handle(handle, GET_AUX1, &dummy);
425 if (ACPI_FAILURE(status))
428 status = acpi_get_handle(handle, SET_AUX1, &dummy);
429 if (ACPI_FAILURE(status))
432 result = intel_menlow_add_one_attribute("aux1", 0644,
433 aux1_show, aux1_store,
434 &thermal->device, handle);
436 intel_menlow_unregister_sensor();
441 * create the "dabney_enabled" attribute which means the user app
442 * should be loaded or not
445 result = intel_menlow_add_one_attribute("bios_enabled", 0444,
446 bios_enabled_show, NULL,
447 &thermal->device, handle);
449 intel_menlow_unregister_sensor();
456 if (status == AE_NOT_FOUND)
459 intel_menlow_unregister_sensor();
463 static void intel_menlow_unregister_sensor(void)
465 struct intel_menlow_attribute *pos, *next;
467 mutex_lock(&intel_menlow_attr_lock);
468 list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
469 list_del(&pos->node);
470 device_remove_file(pos->device, &pos->attr);
473 mutex_unlock(&intel_menlow_attr_lock);
478 static int __init intel_menlow_module_init(void)
480 int result = -ENODEV;
482 unsigned long long enable;
487 /* Looking for the \_TZ.GSTS method */
488 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
489 if (ACPI_FAILURE(status) || !enable)
492 /* Looking for ACPI device MEM0 with hardware id INT0002 */
493 result = acpi_bus_register_driver(&intel_menlow_memory_driver);
497 /* Looking for sensors in each ACPI thermal zone */
498 status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
500 intel_menlow_register_sensor, NULL, NULL, NULL);
501 if (ACPI_FAILURE(status)) {
502 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
509 static void __exit intel_menlow_module_exit(void)
511 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
512 intel_menlow_unregister_sensor();
515 module_init(intel_menlow_module_init);
516 module_exit(intel_menlow_module_exit);