diff options
| -rw-r--r-- | drivers/acpi/fan.c | 268 |
1 files changed, 241 insertions, 27 deletions
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c index 8a5b450576df..f7d1c8027736 100644 --- a/drivers/acpi/fan.c +++ b/drivers/acpi/fan.c @@ -31,6 +31,7 @@ #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"); @@ -59,6 +60,29 @@ static struct dev_pm_ops acpi_fan_pm = { #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, @@ -73,21 +97,62 @@ static struct platform_driver acpi_fan_driver = { static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state) { - /* ACPI fan device only support two states: ON/OFF */ - *state = 1; + 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_cur_state(struct thermal_cooling_device *cdev, unsigned long - *state) +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++) { + 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) { - struct acpi_device *device = cdev->devdata; int result; int acpi_state = ACPI_STATE_D0; - if (!device) - return -EINVAL; - result = acpi_device_update_power(device, &acpi_state); if (result) return result; @@ -97,21 +162,57 @@ static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long return 0; } -static int -fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) +static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long + *state) { struct acpi_device *device = cdev->devdata; - int result; + 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); +} - if (!device || (state != 0 && state != 1)) +static int fan_set_state(struct acpi_device *device, unsigned long state) +{ + if (state != 0 && state != 1) return -EINVAL; - result = acpi_device_set_power(device, - state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD); + return acpi_device_set_power(device, + state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD); +} - return result; +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, @@ -122,16 +223,125 @@ static const struct thermal_cooling_device_ops fan_cooling_ops = { 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_kzalloc(&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); - result = acpi_device_update_power(device, NULL); - if (result) { - dev_err(&pdev->dev, "Setting initial power state\n"); - goto end; + 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, "Setting initial power state\n"); + goto end; + } } cdev = thermal_cooling_device_register("Fan", device, @@ -143,7 +353,7 @@ static int acpi_fan_probe(struct platform_device *pdev) dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id); - platform_set_drvdata(pdev, cdev); + fan->cdev = cdev; result = sysfs_create_link(&pdev->dev.kobj, &cdev->device.kobj, "thermal_cooling"); @@ -158,21 +368,17 @@ static int acpi_fan_probe(struct platform_device *pdev) dev_err(&pdev->dev, "Failed to create sysfs link " "'device'\n"); - dev_info(&pdev->dev, "%s [%s] (%s)\n", - acpi_device_name(device), acpi_device_bid(device), - !device->power.state ? "on" : "off"); - end: return result; } static int acpi_fan_remove(struct platform_device *pdev) { - struct thermal_cooling_device *cdev = platform_get_drvdata(pdev); + struct acpi_fan *fan = platform_get_drvdata(pdev); sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling"); - sysfs_remove_link(&cdev->device.kobj, "device"); - thermal_cooling_device_unregister(cdev); + sysfs_remove_link(&fan->cdev->device.kobj, "device"); + thermal_cooling_device_unregister(fan->cdev); return 0; } @@ -180,6 +386,10 @@ static int acpi_fan_remove(struct platform_device *pdev) #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; @@ -188,6 +398,10 @@ static int acpi_fan_suspend(struct device *dev) 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) |