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ACPI / Fan: add ACPI 4.0 style fan support
This patch adds support for ACPI 4.0 style fan, lacking part is: no support for 'Low Speed Notification Support', 'Fine Grain Control' is not used yet. It's not clear what to do on suspend/resume callback for 4.0 style ACPI fan, so it does nothing for now. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Aaron Lu
Zhang Rui
parent
19593a1fb1
commit
9519a6356c
@ -31,6 +31,7 @@
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#include <linux/thermal.h>
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#include <linux/acpi.h>
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#include <linux/platform_device.h>
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#include <linux/sort.h>
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI Fan Driver");
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@ -59,6 +60,29 @@ static struct dev_pm_ops acpi_fan_pm = {
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#define FAN_PM_OPS_PTR NULL
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#endif
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struct acpi_fan_fps {
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u64 control;
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u64 trip_point;
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u64 speed;
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u64 noise_level;
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u64 power;
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};
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struct acpi_fan_fif {
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u64 revision;
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u64 fine_grain_ctrl;
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u64 step_size;
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u64 low_speed_notification;
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};
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struct acpi_fan {
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bool acpi4;
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struct acpi_fan_fif fif;
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struct acpi_fan_fps *fps;
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int fps_count;
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struct thermal_cooling_device *cdev;
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};
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static struct platform_driver acpi_fan_driver = {
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.probe = acpi_fan_probe,
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.remove = acpi_fan_remove,
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@ -73,21 +97,62 @@ static struct platform_driver acpi_fan_driver = {
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static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
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*state)
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{
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/* ACPI fan device only support two states: ON/OFF */
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*state = 1;
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struct acpi_device *device = cdev->devdata;
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struct acpi_fan *fan = acpi_driver_data(device);
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if (fan->acpi4)
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*state = fan->fps_count - 1;
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else
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*state = 1;
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return 0;
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}
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static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
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*state)
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static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state)
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{
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_fan *fan = acpi_driver_data(device);
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union acpi_object *obj;
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acpi_status status;
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int control, i;
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status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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dev_err(&device->dev, "Get fan state failed\n");
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return status;
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}
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obj = buffer.pointer;
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if (!obj || obj->type != ACPI_TYPE_PACKAGE ||
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obj->package.count != 3 ||
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obj->package.elements[1].type != ACPI_TYPE_INTEGER) {
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dev_err(&device->dev, "Invalid _FST data\n");
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status = -EINVAL;
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goto err;
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}
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control = obj->package.elements[1].integer.value;
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for (i = 0; i < fan->fps_count; i++) {
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if (control == fan->fps[i].control)
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break;
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}
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if (i == fan->fps_count) {
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dev_dbg(&device->dev, "Invalid control value returned\n");
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status = -EINVAL;
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goto err;
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}
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*state = i;
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err:
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kfree(obj);
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return status;
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}
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static int fan_get_state(struct acpi_device *device, unsigned long *state)
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{
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struct acpi_device *device = cdev->devdata;
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int result;
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int acpi_state = ACPI_STATE_D0;
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if (!device)
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return -EINVAL;
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result = acpi_device_update_power(device, &acpi_state);
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if (result)
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return result;
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@ -97,20 +162,56 @@ static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
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return 0;
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}
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static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
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*state)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_fan *fan = acpi_driver_data(device);
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if (fan->acpi4)
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return fan_get_state_acpi4(device, state);
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else
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return fan_get_state(device, state);
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}
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static int fan_set_state(struct acpi_device *device, unsigned long state)
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{
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if (state != 0 && state != 1)
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return -EINVAL;
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return acpi_device_set_power(device,
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state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
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}
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static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state)
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{
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struct acpi_fan *fan = acpi_driver_data(device);
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acpi_status status;
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if (state >= fan->fps_count)
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return -EINVAL;
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status = acpi_execute_simple_method(device->handle, "_FSL",
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fan->fps[state].control);
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if (ACPI_FAILURE(status)) {
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dev_dbg(&device->dev, "Failed to set state by _FSL\n");
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return status;
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}
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return 0;
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}
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static int
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fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
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{
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struct acpi_device *device = cdev->devdata;
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int result;
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struct acpi_fan *fan = acpi_driver_data(device);
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if (!device || (state != 0 && state != 1))
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return -EINVAL;
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result = acpi_device_set_power(device,
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state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
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return result;
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}
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if (fan->acpi4)
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return fan_set_state_acpi4(device, state);
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else
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return fan_set_state(device, state);
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}
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static const struct thermal_cooling_device_ops fan_cooling_ops = {
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.get_max_state = fan_get_max_state,
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@ -122,16 +223,125 @@ static const struct thermal_cooling_device_ops fan_cooling_ops = {
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Driver Interface
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-------------------------------------------------------------------------- */
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static bool acpi_fan_is_acpi4(struct acpi_device *device)
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{
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return acpi_has_method(device->handle, "_FIF") &&
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acpi_has_method(device->handle, "_FPS") &&
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acpi_has_method(device->handle, "_FSL") &&
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acpi_has_method(device->handle, "_FST");
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}
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static int acpi_fan_get_fif(struct acpi_device *device)
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{
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_fan *fan = acpi_driver_data(device);
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struct acpi_buffer format = { sizeof("NNNN"), "NNNN" };
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struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif };
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union acpi_object *obj;
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acpi_status status;
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status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer);
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if (ACPI_FAILURE(status))
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return status;
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obj = buffer.pointer;
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if (!obj || obj->type != ACPI_TYPE_PACKAGE) {
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dev_err(&device->dev, "Invalid _FIF data\n");
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status = -EINVAL;
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goto err;
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}
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status = acpi_extract_package(obj, &format, &fif);
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if (ACPI_FAILURE(status)) {
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dev_err(&device->dev, "Invalid _FIF element\n");
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status = -EINVAL;
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}
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err:
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kfree(obj);
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return status;
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}
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static int acpi_fan_speed_cmp(const void *a, const void *b)
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{
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const struct acpi_fan_fps *fps1 = a;
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const struct acpi_fan_fps *fps2 = b;
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return fps1->speed - fps2->speed;
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}
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static int acpi_fan_get_fps(struct acpi_device *device)
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{
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struct acpi_fan *fan = acpi_driver_data(device);
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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acpi_status status;
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int i;
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status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer);
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if (ACPI_FAILURE(status))
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return status;
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obj = buffer.pointer;
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if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
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dev_err(&device->dev, "Invalid _FPS data\n");
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status = -EINVAL;
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goto err;
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}
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fan->fps_count = obj->package.count - 1; /* minus revision field */
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fan->fps = devm_kzalloc(&device->dev,
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fan->fps_count * sizeof(struct acpi_fan_fps),
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GFP_KERNEL);
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if (!fan->fps) {
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dev_err(&device->dev, "Not enough memory\n");
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status = -ENOMEM;
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goto err;
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}
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for (i = 0; i < fan->fps_count; i++) {
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struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
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struct acpi_buffer fps = { sizeof(fan->fps[i]), &fan->fps[i] };
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status = acpi_extract_package(&obj->package.elements[i + 1],
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&format, &fps);
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if (ACPI_FAILURE(status)) {
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dev_err(&device->dev, "Invalid _FPS element\n");
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break;
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}
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}
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/* sort the state array according to fan speed in increase order */
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sort(fan->fps, fan->fps_count, sizeof(*fan->fps),
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acpi_fan_speed_cmp, NULL);
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err:
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kfree(obj);
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return status;
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}
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static int acpi_fan_probe(struct platform_device *pdev)
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{
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int result = 0;
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struct thermal_cooling_device *cdev;
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struct acpi_fan *fan;
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struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
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result = acpi_device_update_power(device, NULL);
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if (result) {
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dev_err(&pdev->dev, "Setting initial power state\n");
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goto end;
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fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
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if (!fan) {
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dev_err(&device->dev, "No memory for fan\n");
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return -ENOMEM;
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}
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device->driver_data = fan;
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platform_set_drvdata(pdev, fan);
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if (acpi_fan_is_acpi4(device)) {
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if (acpi_fan_get_fif(device) || acpi_fan_get_fps(device))
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goto end;
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fan->acpi4 = true;
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} else {
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result = acpi_device_update_power(device, NULL);
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if (result) {
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dev_err(&device->dev, "Setting initial power state\n");
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goto end;
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}
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}
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cdev = thermal_cooling_device_register("Fan", device,
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@ -143,7 +353,7 @@ static int acpi_fan_probe(struct platform_device *pdev)
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dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
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platform_set_drvdata(pdev, cdev);
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fan->cdev = cdev;
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result = sysfs_create_link(&pdev->dev.kobj,
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&cdev->device.kobj,
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"thermal_cooling");
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@ -158,21 +368,17 @@ static int acpi_fan_probe(struct platform_device *pdev)
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dev_err(&pdev->dev, "Failed to create sysfs link "
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"'device'\n");
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dev_info(&pdev->dev, "%s [%s] (%s)\n",
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acpi_device_name(device), acpi_device_bid(device),
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!device->power.state ? "on" : "off");
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end:
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return result;
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}
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static int acpi_fan_remove(struct platform_device *pdev)
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{
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struct thermal_cooling_device *cdev = platform_get_drvdata(pdev);
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struct acpi_fan *fan = platform_get_drvdata(pdev);
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sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
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sysfs_remove_link(&cdev->device.kobj, "device");
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thermal_cooling_device_unregister(cdev);
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sysfs_remove_link(&fan->cdev->device.kobj, "device");
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thermal_cooling_device_unregister(fan->cdev);
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return 0;
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}
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@ -180,6 +386,10 @@ static int acpi_fan_remove(struct platform_device *pdev)
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#ifdef CONFIG_PM_SLEEP
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static int acpi_fan_suspend(struct device *dev)
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{
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struct acpi_fan *fan = dev_get_drvdata(dev);
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if (fan->acpi4)
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return 0;
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acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);
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return AE_OK;
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@ -188,6 +398,10 @@ static int acpi_fan_suspend(struct device *dev)
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static int acpi_fan_resume(struct device *dev)
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{
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int result;
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struct acpi_fan *fan = dev_get_drvdata(dev);
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if (fan->acpi4)
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return 0;
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result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
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if (result)
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