diff options
Diffstat (limited to 'drivers/acpi/fan.c')
| -rw-r--r-- | drivers/acpi/fan.c | 427 |
1 files changed, 427 insertions, 0 deletions
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c new file mode 100644 index 000000000..fe0183d48 --- /dev/null +++ b/drivers/acpi/fan.c @@ -0,0 +1,427 @@ +/* + * acpi_fan.c - ACPI Fan Driver ($Revision: 29 $) + * + * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> + * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/uaccess.h> +#include <linux/thermal.h> +#include <linux/acpi.h> +#include <linux/platform_device.h> +#include <linux/sort.h> + +MODULE_AUTHOR("Paul Diefenbaugh"); +MODULE_DESCRIPTION("ACPI Fan Driver"); +MODULE_LICENSE("GPL"); + +static int acpi_fan_probe(struct platform_device *pdev); +static int acpi_fan_remove(struct platform_device *pdev); + +static const struct acpi_device_id fan_device_ids[] = { + {"PNP0C0B", 0}, + {"INT3404", 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, fan_device_ids); + +#ifdef CONFIG_PM_SLEEP +static int acpi_fan_suspend(struct device *dev); +static int acpi_fan_resume(struct device *dev); +static const struct dev_pm_ops acpi_fan_pm = { + .resume = acpi_fan_resume, + .freeze = acpi_fan_suspend, + .thaw = acpi_fan_resume, + .restore = acpi_fan_resume, +}; +#define FAN_PM_OPS_PTR (&acpi_fan_pm) +#else +#define FAN_PM_OPS_PTR NULL +#endif + +struct acpi_fan_fps { + u64 control; + u64 trip_point; + u64 speed; + u64 noise_level; + u64 power; +}; + +struct acpi_fan_fif { + u64 revision; + u64 fine_grain_ctrl; + u64 step_size; + u64 low_speed_notification; +}; + +struct acpi_fan { + bool acpi4; + struct acpi_fan_fif fif; + struct acpi_fan_fps *fps; + int fps_count; + struct thermal_cooling_device *cdev; +}; + +static struct platform_driver acpi_fan_driver = { + .probe = acpi_fan_probe, + .remove = acpi_fan_remove, + .driver = { + .name = "acpi-fan", + .acpi_match_table = fan_device_ids, + .pm = FAN_PM_OPS_PTR, + }, +}; + +/* thermal cooling device callbacks */ +static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long + *state) +{ + struct acpi_device *device = cdev->devdata; + struct acpi_fan *fan = acpi_driver_data(device); + + if (fan->acpi4) + *state = fan->fps_count - 1; + else + *state = 1; + return 0; +} + +static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state) +{ + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + struct acpi_fan *fan = acpi_driver_data(device); + union acpi_object *obj; + acpi_status status; + int control, i; + + status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer); + if (ACPI_FAILURE(status)) { + dev_err(&device->dev, "Get fan state failed\n"); + return status; + } + + obj = buffer.pointer; + if (!obj || obj->type != ACPI_TYPE_PACKAGE || + obj->package.count != 3 || + obj->package.elements[1].type != ACPI_TYPE_INTEGER) { + dev_err(&device->dev, "Invalid _FST data\n"); + status = -EINVAL; + goto err; + } + + control = obj->package.elements[1].integer.value; + for (i = 0; i < fan->fps_count; i++) { + /* + * When Fine Grain Control is set, return the state + * corresponding to maximum fan->fps[i].control + * value compared to the current speed. Here the + * fan->fps[] is sorted array with increasing speed. + */ + if (fan->fif.fine_grain_ctrl && control < fan->fps[i].control) { + i = (i > 0) ? i - 1 : 0; + break; + } else if (control == fan->fps[i].control) { + break; + } + } + if (i == fan->fps_count) { + dev_dbg(&device->dev, "Invalid control value returned\n"); + status = -EINVAL; + goto err; + } + + *state = i; + +err: + kfree(obj); + return status; +} + +static int fan_get_state(struct acpi_device *device, unsigned long *state) +{ + int result; + int acpi_state = ACPI_STATE_D0; + + result = acpi_device_update_power(device, &acpi_state); + if (result) + return result; + + *state = acpi_state == ACPI_STATE_D3_COLD + || acpi_state == ACPI_STATE_D3_HOT ? + 0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1); + return 0; +} + +static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long + *state) +{ + struct acpi_device *device = cdev->devdata; + struct acpi_fan *fan = acpi_driver_data(device); + + if (fan->acpi4) + return fan_get_state_acpi4(device, state); + else + return fan_get_state(device, state); +} + +static int fan_set_state(struct acpi_device *device, unsigned long state) +{ + if (state != 0 && state != 1) + return -EINVAL; + + return acpi_device_set_power(device, + state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD); +} + +static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state) +{ + struct acpi_fan *fan = acpi_driver_data(device); + acpi_status status; + + if (state >= fan->fps_count) + return -EINVAL; + + status = acpi_execute_simple_method(device->handle, "_FSL", + fan->fps[state].control); + if (ACPI_FAILURE(status)) { + dev_dbg(&device->dev, "Failed to set state by _FSL\n"); + return status; + } + + return 0; +} + +static int +fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) +{ + struct acpi_device *device = cdev->devdata; + struct acpi_fan *fan = acpi_driver_data(device); + + if (fan->acpi4) + return fan_set_state_acpi4(device, state); + else + return fan_set_state(device, state); +} + +static const struct thermal_cooling_device_ops fan_cooling_ops = { + .get_max_state = fan_get_max_state, + .get_cur_state = fan_get_cur_state, + .set_cur_state = fan_set_cur_state, +}; + +/* -------------------------------------------------------------------------- + * Driver Interface + * -------------------------------------------------------------------------- +*/ + +static bool acpi_fan_is_acpi4(struct acpi_device *device) +{ + return acpi_has_method(device->handle, "_FIF") && + acpi_has_method(device->handle, "_FPS") && + acpi_has_method(device->handle, "_FSL") && + acpi_has_method(device->handle, "_FST"); +} + +static int acpi_fan_get_fif(struct acpi_device *device) +{ + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + struct acpi_fan *fan = acpi_driver_data(device); + struct acpi_buffer format = { sizeof("NNNN"), "NNNN" }; + struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif }; + union acpi_object *obj; + acpi_status status; + + status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer); + if (ACPI_FAILURE(status)) + return status; + + obj = buffer.pointer; + if (!obj || obj->type != ACPI_TYPE_PACKAGE) { + dev_err(&device->dev, "Invalid _FIF data\n"); + status = -EINVAL; + goto err; + } + + status = acpi_extract_package(obj, &format, &fif); + if (ACPI_FAILURE(status)) { + dev_err(&device->dev, "Invalid _FIF element\n"); + status = -EINVAL; + } + +err: + kfree(obj); + return status; +} + +static int acpi_fan_speed_cmp(const void *a, const void *b) +{ + const struct acpi_fan_fps *fps1 = a; + const struct acpi_fan_fps *fps2 = b; + return fps1->speed - fps2->speed; +} + +static int acpi_fan_get_fps(struct acpi_device *device) +{ + struct acpi_fan *fan = acpi_driver_data(device); + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + acpi_status status; + int i; + + status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer); + if (ACPI_FAILURE(status)) + return status; + + obj = buffer.pointer; + if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) { + dev_err(&device->dev, "Invalid _FPS data\n"); + status = -EINVAL; + goto err; + } + + fan->fps_count = obj->package.count - 1; /* minus revision field */ + fan->fps = devm_kcalloc(&device->dev, + fan->fps_count, sizeof(struct acpi_fan_fps), + GFP_KERNEL); + if (!fan->fps) { + dev_err(&device->dev, "Not enough memory\n"); + status = -ENOMEM; + goto err; + } + for (i = 0; i < fan->fps_count; i++) { + struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; + struct acpi_buffer fps = { sizeof(fan->fps[i]), &fan->fps[i] }; + status = acpi_extract_package(&obj->package.elements[i + 1], + &format, &fps); + if (ACPI_FAILURE(status)) { + dev_err(&device->dev, "Invalid _FPS element\n"); + break; + } + } + + /* sort the state array according to fan speed in increase order */ + sort(fan->fps, fan->fps_count, sizeof(*fan->fps), + acpi_fan_speed_cmp, NULL); + +err: + kfree(obj); + return status; +} + +static int acpi_fan_probe(struct platform_device *pdev) +{ + int result = 0; + struct thermal_cooling_device *cdev; + struct acpi_fan *fan; + struct acpi_device *device = ACPI_COMPANION(&pdev->dev); + char *name; + + fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL); + if (!fan) { + dev_err(&device->dev, "No memory for fan\n"); + return -ENOMEM; + } + device->driver_data = fan; + platform_set_drvdata(pdev, fan); + + if (acpi_fan_is_acpi4(device)) { + if (acpi_fan_get_fif(device) || acpi_fan_get_fps(device)) + goto end; + fan->acpi4 = true; + } else { + result = acpi_device_update_power(device, NULL); + if (result) { + dev_err(&device->dev, "Failed to set initial power state\n"); + goto end; + } + } + + if (!strncmp(pdev->name, "PNP0C0B", strlen("PNP0C0B"))) + name = "Fan"; + else + name = acpi_device_bid(device); + + cdev = thermal_cooling_device_register(name, device, + &fan_cooling_ops); + if (IS_ERR(cdev)) { + result = PTR_ERR(cdev); + goto end; + } + + dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id); + + fan->cdev = cdev; + result = sysfs_create_link(&pdev->dev.kobj, + &cdev->device.kobj, + "thermal_cooling"); + if (result) + dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n"); + + result = sysfs_create_link(&cdev->device.kobj, + &pdev->dev.kobj, + "device"); + if (result) + dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n"); + +end: + return result; +} + +static int acpi_fan_remove(struct platform_device *pdev) +{ + struct acpi_fan *fan = platform_get_drvdata(pdev); + + sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling"); + sysfs_remove_link(&fan->cdev->device.kobj, "device"); + thermal_cooling_device_unregister(fan->cdev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int acpi_fan_suspend(struct device *dev) +{ + struct acpi_fan *fan = dev_get_drvdata(dev); + if (fan->acpi4) + return 0; + + acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0); + + return AE_OK; +} + +static int acpi_fan_resume(struct device *dev) +{ + int result; + struct acpi_fan *fan = dev_get_drvdata(dev); + + if (fan->acpi4) + return 0; + + result = acpi_device_update_power(ACPI_COMPANION(dev), NULL); + if (result) + dev_err(dev, "Error updating fan power state\n"); + + return result; +} +#endif + +module_platform_driver(acpi_fan_driver); |