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161 lines
3.6 KiB
161 lines
3.6 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Khadas MCU FAN driver"); |
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MODULE_LICENSE("GPL");
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