2 * intel_menlow.c - Intel menlow Driver for thermal management extension
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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/types.h>
34 #include <linux/pci.h>
37 #include <linux/thermal.h>
38 #include <acpi/acpi_bus.h>
39 #include <acpi/acpi_drivers.h>
41 MODULE_AUTHOR("Thomas Sujith");
42 MODULE_AUTHOR("Zhang Rui");
43 MODULE_DESCRIPTION("Intel Menlow platform specific driver");
44 MODULE_LICENSE("GPL");
47 * Memory controller device control
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
55 static int memory_get_int_max_bandwidth(struct thermal_cooling_device *cdev,
56 unsigned long *max_state)
58 struct acpi_device *device = cdev->devdata;
59 acpi_handle handle = device->handle;
61 struct acpi_object_list arg_list;
62 union acpi_object arg;
63 acpi_status status = AE_OK;
66 arg_list.pointer = &arg;
67 arg.type = ACPI_TYPE_INTEGER;
68 arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
69 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
71 if (ACPI_FAILURE(status))
74 *max_state = value - 1;
78 static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
82 if (memory_get_int_max_bandwidth(cdev, &value))
85 return sprintf(buf, "%ld\n", value);
88 static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
91 struct acpi_device *device = cdev->devdata;
92 acpi_handle handle = device->handle;
94 struct acpi_object_list arg_list;
95 union acpi_object arg;
96 acpi_status status = AE_OK;
99 arg_list.pointer = &arg;
100 arg.type = ACPI_TYPE_INTEGER;
101 arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
102 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
104 if (ACPI_FAILURE(status))
107 return sprintf(buf, "%ld\n", value);
110 static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
113 struct acpi_device *device = cdev->devdata;
114 acpi_handle handle = device->handle;
115 struct acpi_object_list arg_list;
116 union acpi_object arg;
119 unsigned long max_state;
121 if (memory_get_int_max_bandwidth(cdev, &max_state))
124 if (max_state < 0 || state > max_state)
128 arg_list.pointer = &arg;
129 arg.type = ACPI_TYPE_INTEGER;
130 arg.integer.value = state;
133 acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
134 (unsigned long *)&temp);
137 "Bandwidth value was %d: status is %d\n", state, status);
138 if (ACPI_FAILURE(status))
144 static struct thermal_cooling_device_ops memory_cooling_ops = {
145 .get_max_state = memory_get_max_bandwidth,
146 .get_cur_state = memory_get_cur_bandwidth,
147 .set_cur_state = memory_set_cur_bandwidth,
151 * Memory Device Management
153 static int intel_menlow_memory_add(struct acpi_device *device)
155 int result = -ENODEV;
156 acpi_status status = AE_OK;
158 struct thermal_cooling_device *cdev;
163 status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy);
164 if (ACPI_FAILURE(status))
167 status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy);
168 if (ACPI_FAILURE(status))
171 cdev = thermal_cooling_device_register("Memory controller", device,
172 &memory_cooling_ops);
174 result = PTR_ERR(cdev);
178 acpi_driver_data(device) = cdev;
179 result = sysfs_create_link(&device->dev.kobj,
180 &cdev->device.kobj, "thermal_cooling");
182 printk(KERN_ERR PREFIX "Create sysfs link\n");
183 result = sysfs_create_link(&cdev->device.kobj,
184 &device->dev.kobj, "device");
186 printk(KERN_ERR PREFIX "Create sysfs link\n");
192 thermal_cooling_device_unregister(cdev);
197 static int intel_menlow_memory_remove(struct acpi_device *device, int type)
199 struct thermal_cooling_device *cdev = acpi_driver_data(device);
201 if (!device || !cdev)
204 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
205 sysfs_remove_link(&cdev->device.kobj, "device");
206 thermal_cooling_device_unregister(cdev);
211 static const struct acpi_device_id intel_menlow_memory_ids[] = {
216 static struct acpi_driver intel_menlow_memory_driver = {
217 .name = "intel_menlow_thermal_control",
218 .ids = intel_menlow_memory_ids,
220 .add = intel_menlow_memory_add,
221 .remove = intel_menlow_memory_remove,
226 * Sensor control on menlow platform
229 #define THERMAL_AUX0 0
230 #define THERMAL_AUX1 1
231 #define GET_AUX0 "GAX0"
232 #define GET_AUX1 "GAX1"
233 #define SET_AUX0 "SAX0"
234 #define SET_AUX1 "SAX1"
236 struct intel_menlow_attribute {
237 struct device_attribute attr;
238 struct device *device;
240 struct list_head node;
243 static LIST_HEAD(intel_menlow_attr_list);
244 static DEFINE_MUTEX(intel_menlow_attr_lock);
247 * sensor_get_auxtrip - get the current auxtrip value from sensor
248 * @name: Thermalzone name
249 * @auxtype : AUX0/AUX1
252 static int sensor_get_auxtrip(acpi_handle handle, int index, int *value)
256 if ((index != 0 && index != 1) || !value)
259 status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
260 NULL, (unsigned long *)value);
261 if (ACPI_FAILURE(status))
268 * sensor_set_auxtrip - set the new auxtrip value to sensor
269 * @name: Thermalzone name
270 * @auxtype : AUX0/AUX1
273 static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
276 union acpi_object arg = {
279 struct acpi_object_list args = {
284 if (index != 0 && index != 1)
287 status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
288 NULL, (unsigned long *)&temp);
289 if (ACPI_FAILURE(status))
291 if ((index && value < temp) || (!index && value > temp))
294 arg.integer.value = value;
295 status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
296 &args, (unsigned long *)&temp);
297 if (ACPI_FAILURE(status))
300 /* do we need to check the return value of SAX0/SAX1 ? */
305 #define to_intel_menlow_attr(_attr) \
306 container_of(_attr, struct intel_menlow_attribute, attr)
308 static ssize_t aux0_show(struct device *dev,
309 struct device_attribute *dev_attr, char *buf)
311 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
315 result = sensor_get_auxtrip(attr->handle, 0, &value);
317 return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
320 static ssize_t aux1_show(struct device *dev,
321 struct device_attribute *dev_attr, char *buf)
323 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
327 result = sensor_get_auxtrip(attr->handle, 1, &value);
329 return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
332 static ssize_t aux0_store(struct device *dev,
333 struct device_attribute *dev_attr,
334 const char *buf, size_t count)
336 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
340 /*Sanity check; should be a positive integer */
341 if (!sscanf(buf, "%d", &value))
347 result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
348 return result ? result : count;
351 static ssize_t aux1_store(struct device *dev,
352 struct device_attribute *dev_attr,
353 const char *buf, size_t count)
355 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
359 /*Sanity check; should be a positive integer */
360 if (!sscanf(buf, "%d", &value))
366 result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
367 return result ? result : count;
370 /* BIOS can enable/disable the thermal user application in dabney platform */
371 #define BIOS_ENABLED "\\_TZ.GSTS"
372 static ssize_t bios_enabled_show(struct device *dev,
373 struct device_attribute *attr, char *buf)
376 unsigned long bios_enabled;
378 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
379 if (ACPI_FAILURE(status))
382 return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
385 static int intel_menlow_add_one_attribute(char *name, int mode, void *show,
386 void *store, struct device *dev,
389 struct intel_menlow_attribute *attr;
392 attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
396 attr->attr.attr.name = name;
397 attr->attr.attr.mode = mode;
398 attr->attr.show = show;
399 attr->attr.store = store;
401 attr->handle = handle;
403 result = device_create_file(dev, &attr->attr);
407 mutex_lock(&intel_menlow_attr_lock);
408 list_add_tail(&attr->node, &intel_menlow_attr_list);
409 mutex_unlock(&intel_menlow_attr_lock);
414 static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
415 void *context, void **rv)
419 struct thermal_zone_device *thermal;
422 result = acpi_bus_get_private_data(handle, (void **)&thermal);
426 /* _TZ must have the AUX0/1 methods */
427 status = acpi_get_handle(handle, GET_AUX0, &dummy);
428 if (ACPI_FAILURE(status))
431 status = acpi_get_handle(handle, SET_AUX0, &dummy);
432 if (ACPI_FAILURE(status))
435 result = intel_menlow_add_one_attribute("aux0", 0644,
436 aux0_show, aux0_store,
437 &thermal->device, handle);
441 status = acpi_get_handle(handle, GET_AUX1, &dummy);
442 if (ACPI_FAILURE(status))
445 status = acpi_get_handle(handle, SET_AUX1, &dummy);
446 if (ACPI_FAILURE(status))
449 result = intel_menlow_add_one_attribute("aux1", 0644,
450 aux1_show, aux1_store,
451 &thermal->device, handle);
456 * create the "dabney_enabled" attribute which means the user app
457 * should be loaded or not
460 result = intel_menlow_add_one_attribute("bios_enabled", 0444,
461 bios_enabled_show, NULL,
462 &thermal->device, handle);
467 if (status == AE_NOT_FOUND)
473 static void intel_menlow_unregister_sensor(void)
475 struct intel_menlow_attribute *pos, *next;
477 mutex_lock(&intel_menlow_attr_lock);
478 list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
479 list_del(&pos->node);
480 device_remove_file(pos->device, &pos->attr);
483 mutex_unlock(&intel_menlow_attr_lock);
488 static int __init intel_menlow_module_init(void)
490 int result = -ENODEV;
492 unsigned long enable;
497 /* Looking for the \_TZ.GSTS method */
498 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
499 if (ACPI_FAILURE(status) || !enable)
502 /* Looking for ACPI device MEM0 with hardware id INT0002 */
503 result = acpi_bus_register_driver(&intel_menlow_memory_driver);
507 /* Looking for sensors in each ACPI thermal zone */
508 status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
510 intel_menlow_register_sensor, NULL, NULL);
511 if (ACPI_FAILURE(status))
517 static void __exit intel_menlow_module_exit(void)
519 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
520 intel_menlow_unregister_sensor();
523 module_init(intel_menlow_module_init);
524 module_exit(intel_menlow_module_exit);