pwm-fan.rar

/* * pwm-fan.c - driver for fans connected to PWM lines. * * Copyright (c) 2014 . * * Author: Geroge * * 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. */ #ifdef HWMON #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #endif #include <linux/module.h> #include <linux/mutex.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pwm.h> #include <linux/sysfs.h> #include <linux/thermal.h> #define MAX_PWM 255 struct pwm_fan_ctx { struct mutex lock; struct device *dev; // struct pwm_device *pwm; unsigned int pwm_value; unsigned int pwm_fan_state; unsigned int pwm_fan_max_state; unsigned int *pwm_fan_cooling_levels; struct thermal_cooling_device *cdev; }; static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm) { unsigned long duty; int ret = 0; // dump_stack(); // printk("__set_pwm pwm:%ld\n",pwm); mutex_lock(&ctx->lock); if (ctx->pwm_value == pwm) goto exit_set_pwm_err; duty = DIV_ROUND_UP(pwm * (ctx->pwm->args.period - 1), MAX_PWM); // printk("__set_pwm duty:%ld,%d\n",duty,ctx->pwm->args.period); ret = pwm_config(ctx->pwm, duty, ctx->pwm->args.period); if (ret) goto exit_set_pwm_err; if (pwm == 0) pwm_disable(ctx->pwm); if (ctx->pwm_value == 0) { ret = pwm_enable(ctx->pwm); if (ret) goto exit_set_pwm_err; } ctx->pwm_value = pwm; exit_set_pwm_err: mutex_unlock(&ctx->lock); return ret; } #ifdef HWMON static void pwm_fan_update_state(struct pwm_fan_ctx *ctx, unsigned long pwm) { int i; for (i = 0; i < ctx->pwm_fan_max_state; ++i) if (pwm < ctx->pwm_fan_cooling_levels[i + 1]) break; ctx->pwm_fan_state = i; } static ssize_t set_pwm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct pwm_fan_ctx *ctx = dev_get_drvdata(dev); unsigned long pwm; int ret; if (kstrtoul(buf, 10, &pwm) || pwm > MAX_PWM) return -EINVAL; printk("set_pwm pwm:%ld\n",pwm); ret = __set_pwm(ctx, pwm); if (ret) return ret; pwm_fan_update_state(ctx, pwm); return count; } static ssize_t show_pwm(struct device *dev, struct device_attribute *attr, char *buf) { struct pwm_fan_ctx *ctx = dev_get_drvdata(dev); return sprintf(buf, "%u\n", ctx->pwm_value); } static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 0); static struct attribute *pwm_fan_attrs[] = { &sensor_dev_attr_pwm1.dev_attr.attr, NULL, }; ATTRIBUTE_GROUPS(pwm_fan); #endif /* thermal cooling device callbacks */ static int pwm_fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state) { struct pwm_fan_ctx *ctx = cdev->devdata; if (!ctx) return -EINVAL; *state = ctx->pwm_fan_max_state; return 0; } static int pwm_fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long *state) { struct pwm_fan_ctx *ctx = cdev->devdata; if (!ctx) return -EINVAL; *state = ctx->pwm_fan_state; return 0; } static int pwm_fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) { struct pwm_fan_ctx *ctx = cdev->devdata; int ret; #if 0 struct thermal_instance *instance; mutex_lock(&cdev->lock); /* Make sure cdev enters the deepest cooling state */ list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) { dev_err(&cdev->device, "temperature:%d\n",instance->tz->temperature); } mutex_unlock(&cdev->lock); #endif if (!ctx || (state > ctx->pwm_fan_max_state)) return -EINVAL; if (state == ctx->pwm_fan_state) return 0; ret = __set_pwm(ctx, ctx->pwm_fan_cooling_levels[state]); if (ret) { dev_err(&cdev->device, "Cannot set pwm!\n"); return ret; } ctx->pwm_fan_state = state; return ret; } // static int pwm_fan_get_requested_power(struct thermal_cooling_device *cdev, struct thermal_zone_device *tz, u32 *power) { return 0; } static int pwm_fan_state2power(struct thermal_cooling_device *cdev, struct thermal_zone_device *tz, unsigned long state, u32 *power) { return 0; } static int pwm_fan_power2state(struct thermal_cooling_device *cdev, struct thermal_zone_device *tz, u32 power, unsigned long *state) { #if 0 struct pwm_fan_ctx *ctx = cdev->devdata; int ret; printk("pwm_fan_set_cur_state state : %ld\n",state); if (!ctx || (state > ctx->pwm_fan_max_state)) return -EINVAL; if (state == ctx->pwm_fan_state) return 0; ret = __set_pwm(ctx, ctx->pwm_fan_cooling_levels[state]); if (ret) { dev_err(&cdev->device, "Cannot set pwm!\n"); return ret; } ctx->pwm_fan_state = state; #endif // printk("tz->temperature:%d\n",tz->temperature); if(tz->temperature > 70000 && tz->temperature <= 80000) { *state = 1; } else if(tz->temperature > 80000 && tz->temperature <= 100000) { *state = 2; } else if(tz->temperature > 100000 && tz->temperature <= 114000) { *state = 3; } return 0; } static int pwm_fan_monitor_fan(int temperature,unsigned long *state) { if(temperature < 50000) { *state = 0; } else if(temperature > 70000 && temperature <= 75000) { *state = 1; } else if(temperature > 75000 && temperature <= 100000) { *state = 2; } else if(temperature > 100000 && temperature <= 114000) { *state = 3; } return 0; } //end static const struct thermal_cooling_device_ops pwm_fan_cooling_ops = { .get_max_state = pwm_fan_get_max_state, .get_cur_state = pwm_fan_get_cur_state, .set_cur_state = pwm_fan_set_cur_state, // .get_requested_power = pwm_fan_get_requested_power, .state2power = pwm_fan_state2power, .power2state = pwm_fan_power2state, .monitor_fan = pwm_fan_monitor_fan, //end }; static int pwm_fan_of_get_cooling_data(struct device *dev, struct pwm_fan_ctx *ctx) { struct device_node *np = dev->of_node; int num, i, ret; if (!of_find_property(np, "cooling-levels", NULL)) return 0; ret = of_property_count_u32_elems(np, "cooling-levels"); if (ret <= 0) { dev_err(dev, "Wrong data!\n"); return ret ? : -EINVAL; } num = ret; ctx->pwm_fan_cooling_levels = devm_kzalloc(dev, num * sizeof(u32), GFP_KERNEL); if (!ctx->pwm_fan_cooling_levels) return -ENOMEM; ret = of_property_read_u32_array(np, "cooling-levels", ctx->pwm_fan_cooling_levels, num); if (ret) { dev_err(dev, "Property 'cooling-levels' cannot be read!\n"); return ret; } for (i = 0; i < num; i++) { if (ctx->pwm_fan_cooling_levels[i] > MAX_PWM) { dev_err(dev, "PWM fan state[%d]:%d > %d\n", i, ctx->pwm_fan_cooling_levels[i], MAX_PWM); return -EINVAL; } } ctx->pwm_fan_max_state = num - 1; return 0; } static int pwm_fan_probe(struct platform_device *pdev) { struct thermal_cooling_device *cdev; struct pwm_fan_ctx *ctx; #ifdef HWMON struct device *hwmon; #endif int duty_cycle; int ret; ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); if (!ctx) return -ENOMEM; mutex_init(&ctx->lock); ctx->dev = &pdev->dev; ctx->pwm = devm_of_pwm_get(&pdev->dev, pdev->dev.of_node, NULL); if (IS_ERR(ctx->pwm)) { dev_err(&pdev->dev, "Could not get PWM\n"); return PTR_ERR(ctx->pwm); } #if 0 ctx->pwm = devm_pwm_get(&pdev->dev, NULL); if (IS_ERR(ctx->pwm) && PTR_ERR(ctx->pwm) != -EPROBE_DEFER) { dev_err(&pdev->dev, "unable to request PWM, trying devm_of_pwm_get\n"); return PTR_ERR(ctx->pwm); // ctx->pwm = devm_of_pwm_get(&pdev->dev, pdev->dev.of_node, NULL); // if (IS_