Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Lukasz Majewski | 660 | 30.75% | 3 | 13.04% |
Stefan Wahren | 613 | 28.56% | 2 | 8.70% |
Kamil Debski | 561 | 26.14% | 2 | 8.70% |
Guenter Roeck | 92 | 4.29% | 4 | 17.39% |
Bartlomiej Zolnierkiewicz | 70 | 3.26% | 1 | 4.35% |
Thierry Reding | 64 | 2.98% | 3 | 13.04% |
Boris Brezillon | 30 | 1.40% | 1 | 4.35% |
Linus Torvalds | 27 | 1.26% | 1 | 4.35% |
Robin Murphy | 15 | 0.70% | 1 | 4.35% |
Luis de Bethencourt | 7 | 0.33% | 1 | 4.35% |
Anand Moon | 2 | 0.09% | 1 | 4.35% |
Kees Cook | 2 | 0.09% | 1 | 4.35% |
Thomas Gleixner | 2 | 0.09% | 1 | 4.35% |
Fabian Frederick | 1 | 0.05% | 1 | 4.35% |
Total | 2146 | 23 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * pwm-fan.c - Hwmon driver for fans connected to PWM lines. * * Copyright (c) 2014 Samsung Electronics Co., Ltd. * * Author: Kamil Debski <k.debski@samsung.com> */ #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pwm.h> #include <linux/regulator/consumer.h> #include <linux/sysfs.h> #include <linux/thermal.h> #include <linux/timer.h> #define MAX_PWM 255 struct pwm_fan_ctx { struct mutex lock; struct pwm_device *pwm; struct regulator *reg_en; int irq; atomic_t pulses; unsigned int rpm; u8 pulses_per_revolution; ktime_t sample_start; struct timer_list rpm_timer; 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; }; /* This handler assumes self resetting edge triggered interrupt. */ static irqreturn_t pulse_handler(int irq, void *dev_id) { struct pwm_fan_ctx *ctx = dev_id; atomic_inc(&ctx->pulses); return IRQ_HANDLED; } static void sample_timer(struct timer_list *t) { struct pwm_fan_ctx *ctx = from_timer(ctx, t, rpm_timer); int pulses; u64 tmp; pulses = atomic_read(&ctx->pulses); atomic_sub(pulses, &ctx->pulses); tmp = (u64)pulses * ktime_ms_delta(ktime_get(), ctx->sample_start) * 60; do_div(tmp, ctx->pulses_per_revolution * 1000); ctx->rpm = tmp; ctx->sample_start = ktime_get(); mod_timer(&ctx->rpm_timer, jiffies + HZ); } static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm) { unsigned long period; int ret = 0; struct pwm_state state = { }; mutex_lock(&ctx->lock); if (ctx->pwm_value == pwm) goto exit_set_pwm_err; pwm_init_state(ctx->pwm, &state); period = ctx->pwm->args.period; state.duty_cycle = DIV_ROUND_UP(pwm * (period - 1), MAX_PWM); state.enabled = pwm ? true : false; ret = pwm_apply_state(ctx->pwm, &state); if (!ret) ctx->pwm_value = pwm; exit_set_pwm_err: mutex_unlock(&ctx->lock); return ret; } 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 pwm_store(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; ret = __set_pwm(ctx, pwm); if (ret) return ret; pwm_fan_update_state(ctx, pwm); return count; } static ssize_t pwm_show(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 ssize_t rpm_show(struct device *dev, struct device_attribute *attr, char *buf) { struct pwm_fan_ctx *ctx = dev_get_drvdata(dev); return sprintf(buf, "%u\n", ctx->rpm); } static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0); static SENSOR_DEVICE_ATTR_RO(fan1_input, rpm, 0); static struct attribute *pwm_fan_attrs[] = { &sensor_dev_attr_pwm1.dev_attr.attr, &sensor_dev_attr_fan1_input.dev_attr.attr, NULL, }; static umode_t pwm_fan_attrs_visible(struct kobject *kobj, struct attribute *a, int n) { struct device *dev = container_of(kobj, struct device, kobj); struct pwm_fan_ctx *ctx = dev_get_drvdata(dev); /* Hide fan_input in case no interrupt is available */ if (n == 1 && ctx->irq <= 0) return 0; return a->mode; } static const struct attribute_group pwm_fan_group = { .attrs = pwm_fan_attrs, .is_visible = pwm_fan_attrs_visible, }; static const struct attribute_group *pwm_fan_groups[] = { &pwm_fan_group, NULL, }; /* 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 (!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 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, }; 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_kcalloc(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 void pwm_fan_regulator_disable(void *data) { regulator_disable(data); } static void pwm_fan_pwm_disable(void *__ctx) { struct pwm_fan_ctx *ctx = __ctx; pwm_disable(ctx->pwm); del_timer_sync(&ctx->rpm_timer); } static int pwm_fan_probe(struct platform_device *pdev) { struct thermal_cooling_device *cdev; struct device *dev = &pdev->dev; struct pwm_fan_ctx *ctx; struct device *hwmon; int ret; struct pwm_state state = { }; u32 ppr = 2; ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); if (!ctx) return -ENOMEM; mutex_init(&ctx->lock); ctx->pwm = devm_of_pwm_get(dev, dev->of_node, NULL); if (IS_ERR(ctx->pwm)) { ret = PTR_ERR(ctx->pwm); if (ret != -EPROBE_DEFER) dev_err(dev, "Could not get PWM: %d\n", ret); return ret; } platform_set_drvdata(pdev, ctx); ctx->irq = platform_get_irq_optional(pdev, 0); if (ctx->irq == -EPROBE_DEFER) return ctx->irq; ctx->reg_en = devm_regulator_get_optional(dev, "fan"); if (IS_ERR(ctx->reg_en)) { if (PTR_ERR(ctx->reg_en) != -ENODEV) return PTR_ERR(ctx->reg_en); ctx->reg_en = NULL; } else { ret = regulator_enable(ctx->reg_en); if (ret) { dev_err(dev, "Failed to enable fan supply: %d\n", ret); return ret; } ret = devm_add_action_or_reset(dev, pwm_fan_regulator_disable, ctx->reg_en); if (ret) return ret; } ctx->pwm_value = MAX_PWM; /* Set duty cycle to maximum allowed and enable PWM output */ pwm_init_state(ctx->pwm, &state); state.duty_cycle = ctx->pwm->args.period - 1; state.enabled = true; ret = pwm_apply_state(ctx->pwm, &state); if (ret) { dev_err(dev, "Failed to configure PWM: %d\n", ret); return ret; } timer_setup(&ctx->rpm_timer, sample_timer, 0); ret = devm_add_action_or_reset(dev, pwm_fan_pwm_disable, ctx); if (ret) return ret; of_property_read_u32(dev->of_node, "pulses-per-revolution", &ppr); ctx->pulses_per_revolution = ppr; if (!ctx->pulses_per_revolution) { dev_err(dev, "pulses-per-revolution can't be zero.\n"); return -EINVAL; } if (ctx->irq > 0) { ret = devm_request_irq(dev, ctx->irq, pulse_handler, 0, pdev->name, ctx); if (ret) { dev_err(dev, "Failed to request interrupt: %d\n", ret); return ret; } ctx->sample_start = ktime_get(); mod_timer(&ctx->rpm_timer, jiffies + HZ); } hwmon = devm_hwmon_device_register_with_groups(dev, "pwmfan", ctx, pwm_fan_groups); if (IS_ERR(hwmon)) { dev_err(dev, "Failed to register hwmon device\n"); return PTR_ERR(hwmon); } ret = pwm_fan_of_get_cooling_data(dev, ctx); if (ret) return ret; ctx->pwm_fan_state = ctx->pwm_fan_max_state; if (IS_ENABLED(CONFIG_THERMAL)) { cdev = devm_thermal_of_cooling_device_register(dev, dev->of_node, "pwm-fan", ctx, &pwm_fan_cooling_ops); if (IS_ERR(cdev)) { ret = PTR_ERR(cdev); dev_err(dev, "Failed to register pwm-fan as cooling device: %d\n", ret); return ret; } ctx->cdev = cdev; thermal_cdev_update(cdev); } return 0; } #ifdef CONFIG_PM_SLEEP static int pwm_fan_suspend(struct device *dev) { struct pwm_fan_ctx *ctx = dev_get_drvdata(dev); struct pwm_args args; int ret; pwm_get_args(ctx->pwm, &args); if (ctx->pwm_value) { ret = pwm_config(ctx->pwm, 0, args.period); if (ret < 0) return ret; pwm_disable(ctx->pwm); } if (ctx->reg_en) { ret = regulator_disable(ctx->reg_en); if (ret) { dev_err(dev, "Failed to disable fan supply: %d\n", ret); return ret; } } return 0; } static int pwm_fan_resume(struct device *dev) { struct pwm_fan_ctx *ctx = dev_get_drvdata(dev); struct pwm_args pargs; unsigned long duty; int ret; if (ctx->reg_en) { ret = regulator_enable(ctx->reg_en); if (ret) { dev_err(dev, "Failed to enable fan supply: %d\n", ret); return ret; } } if (ctx->pwm_value == 0) return 0; pwm_get_args(ctx->pwm, &pargs); duty = DIV_ROUND_UP(ctx->pwm_value * (pargs.period - 1), MAX_PWM); ret = pwm_config(ctx->pwm, duty, pargs.period); if (ret) return ret; return pwm_enable(ctx->pwm); } #endif static SIMPLE_DEV_PM_OPS(pwm_fan_pm, pwm_fan_suspend, pwm_fan_resume); static const struct of_device_id of_pwm_fan_match[] = { { .compatible = "pwm-fan", }, {}, }; MODULE_DEVICE_TABLE(of, of_pwm_fan_match); static struct platform_driver pwm_fan_driver = { .probe = pwm_fan_probe, .driver = { .name = "pwm-fan", .pm = &pwm_fan_pm, .of_match_table = of_pwm_fan_match, }, }; module_platform_driver(pwm_fan_driver); MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>"); MODULE_ALIAS("platform:pwm-fan"); MODULE_DESCRIPTION("PWM FAN driver"); MODULE_LICENSE("GPL");
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