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23ff8529ee
The change of the cooling device state should be used by the governor or at least by the core code, not by the drivers themselves. Remove the API usage and move the function declaration to the internal headers. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Zhang Rui <rui.zhang@intel.com> Link: https://lore.kernel.org/r/20210118173824.9970-1-daniel.lezcano@linaro.org
161 lines
3.6 KiB
C
161 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Khadas MCU Controlled FAN driver
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*
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* Copyright (C) 2020 BayLibre SAS
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* Author(s): Neil Armstrong <narmstrong@baylibre.com>
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*/
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/khadas-mcu.h>
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#include <linux/regmap.h>
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#include <linux/sysfs.h>
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#include <linux/thermal.h>
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#define MAX_LEVEL 3
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struct khadas_mcu_fan_ctx {
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struct khadas_mcu *mcu;
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unsigned int level;
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struct thermal_cooling_device *cdev;
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};
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static int khadas_mcu_fan_set_level(struct khadas_mcu_fan_ctx *ctx,
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unsigned int level)
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{
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int ret;
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ret = regmap_write(ctx->mcu->regmap, KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG,
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level);
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if (ret)
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return ret;
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ctx->level = level;
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return 0;
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}
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static int khadas_mcu_fan_get_max_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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*state = MAX_LEVEL;
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return 0;
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}
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static int khadas_mcu_fan_get_cur_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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struct khadas_mcu_fan_ctx *ctx = cdev->devdata;
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*state = ctx->level;
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return 0;
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}
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static int
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khadas_mcu_fan_set_cur_state(struct thermal_cooling_device *cdev,
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unsigned long state)
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{
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struct khadas_mcu_fan_ctx *ctx = cdev->devdata;
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if (state > MAX_LEVEL)
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return -EINVAL;
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if (state == ctx->level)
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return 0;
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return khadas_mcu_fan_set_level(ctx, state);
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}
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static const struct thermal_cooling_device_ops khadas_mcu_fan_cooling_ops = {
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.get_max_state = khadas_mcu_fan_get_max_state,
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.get_cur_state = khadas_mcu_fan_get_cur_state,
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.set_cur_state = khadas_mcu_fan_set_cur_state,
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};
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static int khadas_mcu_fan_probe(struct platform_device *pdev)
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{
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struct khadas_mcu *mcu = dev_get_drvdata(pdev->dev.parent);
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struct thermal_cooling_device *cdev;
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struct device *dev = &pdev->dev;
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struct khadas_mcu_fan_ctx *ctx;
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int ret;
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ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->mcu = mcu;
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platform_set_drvdata(pdev, ctx);
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cdev = devm_thermal_of_cooling_device_register(dev->parent,
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dev->parent->of_node, "khadas-mcu-fan", ctx,
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&khadas_mcu_fan_cooling_ops);
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if (IS_ERR(cdev)) {
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ret = PTR_ERR(cdev);
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dev_err(dev, "Failed to register khadas-mcu-fan as cooling device: %d\n",
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ret);
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return ret;
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}
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ctx->cdev = cdev;
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return 0;
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}
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static void khadas_mcu_fan_shutdown(struct platform_device *pdev)
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{
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struct khadas_mcu_fan_ctx *ctx = platform_get_drvdata(pdev);
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khadas_mcu_fan_set_level(ctx, 0);
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}
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#ifdef CONFIG_PM_SLEEP
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static int khadas_mcu_fan_suspend(struct device *dev)
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{
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struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
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unsigned int level_save = ctx->level;
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int ret;
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ret = khadas_mcu_fan_set_level(ctx, 0);
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if (ret)
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return ret;
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ctx->level = level_save;
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return 0;
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}
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static int khadas_mcu_fan_resume(struct device *dev)
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{
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struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
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return khadas_mcu_fan_set_level(ctx, ctx->level);
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}
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#endif
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static SIMPLE_DEV_PM_OPS(khadas_mcu_fan_pm, khadas_mcu_fan_suspend,
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khadas_mcu_fan_resume);
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static const struct platform_device_id khadas_mcu_fan_id_table[] = {
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{ .name = "khadas-mcu-fan-ctrl", },
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{},
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};
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MODULE_DEVICE_TABLE(platform, khadas_mcu_fan_id_table);
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static struct platform_driver khadas_mcu_fan_driver = {
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.probe = khadas_mcu_fan_probe,
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.shutdown = khadas_mcu_fan_shutdown,
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.driver = {
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.name = "khadas-mcu-fan-ctrl",
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.pm = &khadas_mcu_fan_pm,
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},
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.id_table = khadas_mcu_fan_id_table,
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};
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module_platform_driver(khadas_mcu_fan_driver);
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MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
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MODULE_DESCRIPTION("Khadas MCU FAN driver");
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MODULE_LICENSE("GPL");
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