2010-10-22 06:44:19 +08:00
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/*
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* gpio-fan.c - Hwmon driver for fans connected to GPIO lines.
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*
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* Copyright (C) 2010 LaCie
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*
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* Author: Simon Guinot <sguinot@lacie.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/hwmon.h>
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#include <linux/gpio.h>
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2013-09-27 19:26:00 +08:00
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#include <linux/of.h>
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2012-09-15 00:07:06 +08:00
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#include <linux/of_platform.h>
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#include <linux/of_gpio.h>
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2015-01-09 02:05:03 +08:00
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#include <linux/thermal.h>
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2010-10-22 06:44:19 +08:00
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2017-09-26 07:09:05 +08:00
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struct gpio_fan_alarm {
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unsigned int gpio;
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unsigned int active_low;
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};
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struct gpio_fan_speed {
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int rpm;
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int ctrl_val;
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};
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2010-10-22 06:44:19 +08:00
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struct gpio_fan_data {
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2017-09-26 07:09:06 +08:00
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struct device *dev;
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2010-10-22 06:44:19 +08:00
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struct device *hwmon_dev;
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2015-01-09 02:05:03 +08:00
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/* Cooling device if any */
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struct thermal_cooling_device *cdev;
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2010-10-22 06:44:19 +08:00
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struct mutex lock; /* lock GPIOs operations. */
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int num_ctrl;
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unsigned *ctrl;
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int num_speed;
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struct gpio_fan_speed *speed;
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int speed_index;
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2012-07-08 06:01:03 +08:00
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#ifdef CONFIG_PM_SLEEP
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2010-10-22 06:44:19 +08:00
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int resume_speed;
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#endif
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bool pwm_enable;
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struct gpio_fan_alarm *alarm;
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struct work_struct alarm_work;
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};
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/*
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* Alarm GPIO.
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*/
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static void fan_alarm_notify(struct work_struct *ws)
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{
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struct gpio_fan_data *fan_data =
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container_of(ws, struct gpio_fan_data, alarm_work);
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2017-09-26 07:09:06 +08:00
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sysfs_notify(&fan_data->dev->kobj, NULL, "fan1_alarm");
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kobject_uevent(&fan_data->dev->kobj, KOBJ_CHANGE);
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2010-10-22 06:44:19 +08:00
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}
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static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id)
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{
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struct gpio_fan_data *fan_data = dev_id;
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schedule_work(&fan_data->alarm_work);
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return IRQ_NONE;
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}
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2016-12-22 20:04:44 +08:00
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static ssize_t fan1_alarm_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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2010-10-22 06:44:19 +08:00
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{
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struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
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struct gpio_fan_alarm *alarm = fan_data->alarm;
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2014-12-05 00:58:47 +08:00
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int value = gpio_get_value_cansleep(alarm->gpio);
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2010-10-22 06:44:19 +08:00
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if (alarm->active_low)
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value = !value;
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return sprintf(buf, "%d\n", value);
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}
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2016-12-22 20:04:44 +08:00
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static DEVICE_ATTR_RO(fan1_alarm);
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2010-10-22 06:44:19 +08:00
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2017-09-26 07:09:08 +08:00
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static int fan_alarm_init(struct gpio_fan_data *fan_data)
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2010-10-22 06:44:19 +08:00
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{
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int err;
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int alarm_irq;
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2017-09-26 07:09:06 +08:00
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struct device *dev = fan_data->dev;
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2017-09-26 07:09:08 +08:00
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struct gpio_fan_alarm *alarm = fan_data->alarm;
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2010-10-22 06:44:19 +08:00
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2017-09-26 07:09:06 +08:00
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err = devm_gpio_request(dev, alarm->gpio, "GPIO fan alarm");
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2010-10-22 06:44:19 +08:00
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if (err)
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return err;
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err = gpio_direction_input(alarm->gpio);
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if (err)
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2012-06-03 00:58:07 +08:00
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return err;
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2010-10-22 06:44:19 +08:00
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/*
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* If the alarm GPIO don't support interrupts, just leave
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* without initializing the fail notification support.
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*/
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alarm_irq = gpio_to_irq(alarm->gpio);
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if (alarm_irq < 0)
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return 0;
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INIT_WORK(&fan_data->alarm_work, fan_alarm_notify);
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2011-03-28 23:49:12 +08:00
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irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH);
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2017-09-26 07:09:06 +08:00
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err = devm_request_irq(dev, alarm_irq, fan_alarm_irq_handler,
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2012-06-03 00:58:07 +08:00
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IRQF_SHARED, "GPIO fan alarm", fan_data);
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2010-10-22 06:44:19 +08:00
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return err;
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}
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/*
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* Control GPIOs.
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*/
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/* Must be called with fan_data->lock held, except during initialization. */
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static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val)
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{
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int i;
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for (i = 0; i < fan_data->num_ctrl; i++)
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2014-12-05 00:58:47 +08:00
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gpio_set_value_cansleep(fan_data->ctrl[i], (ctrl_val >> i) & 1);
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2010-10-22 06:44:19 +08:00
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}
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static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
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{
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int i;
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int ctrl_val = 0;
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for (i = 0; i < fan_data->num_ctrl; i++) {
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int value;
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2014-12-05 00:58:47 +08:00
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value = gpio_get_value_cansleep(fan_data->ctrl[i]);
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2010-10-22 06:44:19 +08:00
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ctrl_val |= (value << i);
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}
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return ctrl_val;
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}
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/* Must be called with fan_data->lock held, except during initialization. */
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static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index)
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{
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if (fan_data->speed_index == speed_index)
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return;
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__set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val);
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fan_data->speed_index = speed_index;
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}
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static int get_fan_speed_index(struct gpio_fan_data *fan_data)
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{
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int ctrl_val = __get_fan_ctrl(fan_data);
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int i;
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for (i = 0; i < fan_data->num_speed; i++)
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if (fan_data->speed[i].ctrl_val == ctrl_val)
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return i;
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2017-09-26 07:09:06 +08:00
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dev_warn(fan_data->dev,
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2010-10-22 06:44:19 +08:00
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"missing speed array entry for GPIO value 0x%x\n", ctrl_val);
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2013-09-14 01:42:39 +08:00
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return -ENODEV;
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2010-10-22 06:44:19 +08:00
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}
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2014-08-02 13:36:38 +08:00
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static int rpm_to_speed_index(struct gpio_fan_data *fan_data, unsigned long rpm)
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2010-10-22 06:44:19 +08:00
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{
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struct gpio_fan_speed *speed = fan_data->speed;
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int i;
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for (i = 0; i < fan_data->num_speed; i++)
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if (speed[i].rpm >= rpm)
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return i;
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return fan_data->num_speed - 1;
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}
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2016-12-22 20:04:44 +08:00
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static ssize_t pwm1_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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2010-10-22 06:44:19 +08:00
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{
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struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
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u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1);
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return sprintf(buf, "%d\n", pwm);
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}
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2016-12-22 20:04:44 +08:00
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static ssize_t pwm1_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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2010-10-22 06:44:19 +08:00
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{
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struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
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unsigned long pwm;
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int speed_index;
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int ret = count;
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2012-01-05 03:58:52 +08:00
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if (kstrtoul(buf, 10, &pwm) || pwm > 255)
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2010-10-22 06:44:19 +08:00
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return -EINVAL;
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mutex_lock(&fan_data->lock);
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if (!fan_data->pwm_enable) {
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ret = -EPERM;
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goto exit_unlock;
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}
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speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255);
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set_fan_speed(fan_data, speed_index);
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exit_unlock:
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mutex_unlock(&fan_data->lock);
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return ret;
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}
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2016-12-22 20:04:44 +08:00
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static ssize_t pwm1_enable_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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2010-10-22 06:44:19 +08:00
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{
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struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", fan_data->pwm_enable);
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}
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2016-12-22 20:04:44 +08:00
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static ssize_t pwm1_enable_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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2010-10-22 06:44:19 +08:00
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{
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struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
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unsigned long val;
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|
2012-01-05 03:58:52 +08:00
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if (kstrtoul(buf, 10, &val) || val > 1)
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2010-10-22 06:44:19 +08:00
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return -EINVAL;
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if (fan_data->pwm_enable == val)
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return count;
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mutex_lock(&fan_data->lock);
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fan_data->pwm_enable = val;
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/* Disable manual control mode: set fan at full speed. */
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if (val == 0)
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set_fan_speed(fan_data, fan_data->num_speed - 1);
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mutex_unlock(&fan_data->lock);
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return count;
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}
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|
2016-12-22 20:04:44 +08:00
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static ssize_t pwm1_mode_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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2010-10-22 06:44:19 +08:00
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{
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return sprintf(buf, "0\n");
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}
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|
2016-12-22 20:04:44 +08:00
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static ssize_t fan1_min_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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2010-10-22 06:44:19 +08:00
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{
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struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", fan_data->speed[0].rpm);
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}
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|
2016-12-22 20:04:44 +08:00
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static ssize_t fan1_max_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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2010-10-22 06:44:19 +08:00
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{
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struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n",
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fan_data->speed[fan_data->num_speed - 1].rpm);
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}
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|
2016-12-22 20:04:44 +08:00
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static ssize_t fan1_input_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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2010-10-22 06:44:19 +08:00
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{
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struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm);
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}
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static ssize_t set_rpm(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
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unsigned long rpm;
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int ret = count;
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|
2012-01-05 03:58:52 +08:00
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if (kstrtoul(buf, 10, &rpm))
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2010-10-22 06:44:19 +08:00
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return -EINVAL;
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mutex_lock(&fan_data->lock);
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if (!fan_data->pwm_enable) {
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ret = -EPERM;
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goto exit_unlock;
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}
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set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm));
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exit_unlock:
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mutex_unlock(&fan_data->lock);
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return ret;
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}
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|
2016-12-22 20:04:44 +08:00
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static DEVICE_ATTR_RW(pwm1);
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static DEVICE_ATTR_RW(pwm1_enable);
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static DEVICE_ATTR_RO(pwm1_mode);
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static DEVICE_ATTR_RO(fan1_min);
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static DEVICE_ATTR_RO(fan1_max);
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static DEVICE_ATTR_RO(fan1_input);
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static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, fan1_input_show, set_rpm);
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2010-10-22 06:44:19 +08:00
|
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|
|
2013-03-31 00:09:39 +08:00
|
|
|
static umode_t gpio_fan_is_visible(struct kobject *kobj,
|
|
|
|
struct attribute *attr, int index)
|
|
|
|
{
|
|
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
|
|
struct gpio_fan_data *data = dev_get_drvdata(dev);
|
|
|
|
|
2013-07-07 00:46:14 +08:00
|
|
|
if (index == 0 && !data->alarm)
|
2013-03-31 00:09:39 +08:00
|
|
|
return 0;
|
2013-07-07 00:46:14 +08:00
|
|
|
if (index > 0 && !data->ctrl)
|
2013-03-31 00:09:39 +08:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
return attr->mode;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct attribute *gpio_fan_attributes[] = {
|
2013-07-07 00:46:14 +08:00
|
|
|
&dev_attr_fan1_alarm.attr, /* 0 */
|
|
|
|
&dev_attr_pwm1.attr, /* 1 */
|
2010-10-22 06:44:19 +08:00
|
|
|
&dev_attr_pwm1_enable.attr,
|
|
|
|
&dev_attr_pwm1_mode.attr,
|
|
|
|
&dev_attr_fan1_input.attr,
|
|
|
|
&dev_attr_fan1_target.attr,
|
|
|
|
&dev_attr_fan1_min.attr,
|
|
|
|
&dev_attr_fan1_max.attr,
|
|
|
|
NULL
|
|
|
|
};
|
|
|
|
|
2013-03-31 00:09:39 +08:00
|
|
|
static const struct attribute_group gpio_fan_group = {
|
|
|
|
.attrs = gpio_fan_attributes,
|
|
|
|
.is_visible = gpio_fan_is_visible,
|
2010-10-22 06:44:19 +08:00
|
|
|
};
|
|
|
|
|
2013-07-07 00:46:14 +08:00
|
|
|
static const struct attribute_group *gpio_fan_groups[] = {
|
|
|
|
&gpio_fan_group,
|
|
|
|
NULL
|
|
|
|
};
|
|
|
|
|
2017-09-26 07:09:08 +08:00
|
|
|
static int fan_ctrl_init(struct gpio_fan_data *fan_data)
|
2010-10-22 06:44:19 +08:00
|
|
|
{
|
2017-09-26 07:09:06 +08:00
|
|
|
struct device *dev = fan_data->dev;
|
2017-09-26 07:09:08 +08:00
|
|
|
int num_ctrl = fan_data->num_ctrl;
|
|
|
|
unsigned int *ctrl = fan_data->ctrl;
|
2010-10-22 06:44:19 +08:00
|
|
|
int i, err;
|
|
|
|
|
|
|
|
for (i = 0; i < num_ctrl; i++) {
|
2017-09-26 07:09:06 +08:00
|
|
|
err = devm_gpio_request(dev, ctrl[i],
|
2012-06-03 00:58:07 +08:00
|
|
|
"GPIO fan control");
|
2010-10-22 06:44:19 +08:00
|
|
|
if (err)
|
2012-06-03 00:58:07 +08:00
|
|
|
return err;
|
2010-10-22 06:44:19 +08:00
|
|
|
|
2014-12-05 00:58:47 +08:00
|
|
|
err = gpio_direction_output(ctrl[i],
|
|
|
|
gpio_get_value_cansleep(ctrl[i]));
|
2012-06-03 00:58:07 +08:00
|
|
|
if (err)
|
|
|
|
return err;
|
2010-10-22 06:44:19 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
fan_data->pwm_enable = true; /* Enable manual fan speed control. */
|
|
|
|
fan_data->speed_index = get_fan_speed_index(fan_data);
|
2012-06-03 00:58:07 +08:00
|
|
|
if (fan_data->speed_index < 0)
|
2013-09-14 01:42:39 +08:00
|
|
|
return fan_data->speed_index;
|
2010-10-22 06:44:19 +08:00
|
|
|
|
2013-03-31 00:09:39 +08:00
|
|
|
return 0;
|
2010-10-22 06:44:19 +08:00
|
|
|
}
|
|
|
|
|
2015-01-09 02:05:03 +08:00
|
|
|
static int gpio_fan_get_max_state(struct thermal_cooling_device *cdev,
|
|
|
|
unsigned long *state)
|
|
|
|
{
|
|
|
|
struct gpio_fan_data *fan_data = cdev->devdata;
|
|
|
|
|
|
|
|
if (!fan_data)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
*state = fan_data->num_speed - 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int gpio_fan_get_cur_state(struct thermal_cooling_device *cdev,
|
|
|
|
unsigned long *state)
|
|
|
|
{
|
|
|
|
struct gpio_fan_data *fan_data = cdev->devdata;
|
|
|
|
|
|
|
|
if (!fan_data)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2016-02-20 08:09:51 +08:00
|
|
|
*state = fan_data->speed_index;
|
2015-01-09 02:05:03 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int gpio_fan_set_cur_state(struct thermal_cooling_device *cdev,
|
|
|
|
unsigned long state)
|
|
|
|
{
|
|
|
|
struct gpio_fan_data *fan_data = cdev->devdata;
|
|
|
|
|
|
|
|
if (!fan_data)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
set_fan_speed(fan_data, state);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct thermal_cooling_device_ops gpio_fan_cool_ops = {
|
|
|
|
.get_max_state = gpio_fan_get_max_state,
|
|
|
|
.get_cur_state = gpio_fan_get_cur_state,
|
|
|
|
.set_cur_state = gpio_fan_set_cur_state,
|
|
|
|
};
|
|
|
|
|
2012-09-15 00:07:06 +08:00
|
|
|
/*
|
|
|
|
* Translate OpenFirmware node properties into platform_data
|
|
|
|
*/
|
2017-09-26 07:09:08 +08:00
|
|
|
static int gpio_fan_get_of_data(struct gpio_fan_data *fan_data)
|
2012-09-15 00:07:06 +08:00
|
|
|
{
|
|
|
|
struct gpio_fan_speed *speed;
|
2017-09-26 07:09:08 +08:00
|
|
|
struct device *dev = fan_data->dev;
|
|
|
|
struct device_node *np = dev->of_node;
|
2012-09-15 00:07:06 +08:00
|
|
|
unsigned *ctrl;
|
|
|
|
unsigned i;
|
|
|
|
u32 u;
|
|
|
|
struct property *prop;
|
|
|
|
const __be32 *p;
|
|
|
|
|
2015-02-26 01:58:19 +08:00
|
|
|
/* Alarm GPIO if one exists */
|
2017-09-26 07:09:08 +08:00
|
|
|
if (of_gpio_named_count(np, "alarm-gpios") > 0) {
|
2015-02-26 01:58:19 +08:00
|
|
|
struct gpio_fan_alarm *alarm;
|
|
|
|
int val;
|
|
|
|
enum of_gpio_flags flags;
|
|
|
|
|
|
|
|
alarm = devm_kzalloc(dev, sizeof(struct gpio_fan_alarm),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!alarm)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2017-09-26 07:09:08 +08:00
|
|
|
val = of_get_named_gpio_flags(np, "alarm-gpios", 0, &flags);
|
2015-02-26 01:58:19 +08:00
|
|
|
if (val < 0)
|
|
|
|
return val;
|
|
|
|
alarm->gpio = val;
|
|
|
|
alarm->active_low = flags & OF_GPIO_ACTIVE_LOW;
|
|
|
|
|
2017-09-26 07:09:08 +08:00
|
|
|
fan_data->alarm = alarm;
|
2015-02-26 01:58:19 +08:00
|
|
|
}
|
|
|
|
|
2012-09-15 00:07:06 +08:00
|
|
|
/* Fill GPIO pin array */
|
2017-09-26 07:09:08 +08:00
|
|
|
fan_data->num_ctrl = of_gpio_count(np);
|
|
|
|
if (fan_data->num_ctrl <= 0) {
|
|
|
|
if (fan_data->alarm)
|
2015-02-26 01:58:19 +08:00
|
|
|
return 0;
|
|
|
|
dev_err(dev, "DT properties empty / missing");
|
2012-09-15 00:07:06 +08:00
|
|
|
return -ENODEV;
|
|
|
|
}
|
2017-09-26 07:09:08 +08:00
|
|
|
ctrl = devm_kzalloc(dev, fan_data->num_ctrl * sizeof(unsigned int),
|
|
|
|
GFP_KERNEL);
|
2012-09-15 00:07:06 +08:00
|
|
|
if (!ctrl)
|
|
|
|
return -ENOMEM;
|
2017-09-26 07:09:08 +08:00
|
|
|
for (i = 0; i < fan_data->num_ctrl; i++) {
|
2012-09-15 00:07:06 +08:00
|
|
|
int val;
|
|
|
|
|
2017-09-26 07:09:08 +08:00
|
|
|
val = of_get_gpio(np, i);
|
2012-09-15 00:07:06 +08:00
|
|
|
if (val < 0)
|
|
|
|
return val;
|
|
|
|
ctrl[i] = val;
|
|
|
|
}
|
2017-09-26 07:09:08 +08:00
|
|
|
fan_data->ctrl = ctrl;
|
2012-09-15 00:07:06 +08:00
|
|
|
|
|
|
|
/* Get number of RPM/ctrl_val pairs in speed map */
|
2017-09-26 07:09:08 +08:00
|
|
|
prop = of_find_property(np, "gpio-fan,speed-map", &i);
|
2012-09-15 00:07:06 +08:00
|
|
|
if (!prop) {
|
|
|
|
dev_err(dev, "gpio-fan,speed-map DT property missing");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
i = i / sizeof(u32);
|
|
|
|
if (i == 0 || i & 1) {
|
|
|
|
dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
2017-09-26 07:09:08 +08:00
|
|
|
fan_data->num_speed = i / 2;
|
2012-09-15 00:07:06 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Populate speed map
|
|
|
|
* Speed map is in the form <RPM ctrl_val RPM ctrl_val ...>
|
|
|
|
* this needs splitting into pairs to create gpio_fan_speed structs
|
|
|
|
*/
|
|
|
|
speed = devm_kzalloc(dev,
|
2017-09-26 07:09:08 +08:00
|
|
|
fan_data->num_speed * sizeof(struct gpio_fan_speed),
|
2012-09-15 00:07:06 +08:00
|
|
|
GFP_KERNEL);
|
|
|
|
if (!speed)
|
|
|
|
return -ENOMEM;
|
|
|
|
p = NULL;
|
2017-09-26 07:09:08 +08:00
|
|
|
for (i = 0; i < fan_data->num_speed; i++) {
|
2012-09-15 00:07:06 +08:00
|
|
|
p = of_prop_next_u32(prop, p, &u);
|
|
|
|
if (!p)
|
|
|
|
return -ENODEV;
|
|
|
|
speed[i].rpm = u;
|
|
|
|
p = of_prop_next_u32(prop, p, &u);
|
|
|
|
if (!p)
|
|
|
|
return -ENODEV;
|
|
|
|
speed[i].ctrl_val = u;
|
|
|
|
}
|
2017-09-26 07:09:08 +08:00
|
|
|
fan_data->speed = speed;
|
2012-09-15 00:07:06 +08:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2014-05-07 16:27:54 +08:00
|
|
|
static const struct of_device_id of_gpio_fan_match[] = {
|
2012-09-15 00:07:06 +08:00
|
|
|
{ .compatible = "gpio-fan", },
|
|
|
|
{},
|
|
|
|
};
|
2015-09-18 00:09:28 +08:00
|
|
|
MODULE_DEVICE_TABLE(of, of_gpio_fan_match);
|
2012-09-15 00:07:06 +08:00
|
|
|
|
2012-11-20 02:22:35 +08:00
|
|
|
static int gpio_fan_probe(struct platform_device *pdev)
|
2010-10-22 06:44:19 +08:00
|
|
|
{
|
|
|
|
int err;
|
|
|
|
struct gpio_fan_data *fan_data;
|
2017-09-26 07:09:04 +08:00
|
|
|
struct device *dev = &pdev->dev;
|
|
|
|
struct device_node *np = dev->of_node;
|
2010-10-22 06:44:19 +08:00
|
|
|
|
2017-09-26 07:09:04 +08:00
|
|
|
fan_data = devm_kzalloc(dev, sizeof(struct gpio_fan_data),
|
2015-01-09 02:05:03 +08:00
|
|
|
GFP_KERNEL);
|
|
|
|
if (!fan_data)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2017-09-26 07:09:08 +08:00
|
|
|
err = gpio_fan_get_of_data(fan_data);
|
2017-09-26 07:09:07 +08:00
|
|
|
if (err)
|
|
|
|
return err;
|
2010-10-22 06:44:19 +08:00
|
|
|
|
2017-09-26 07:09:06 +08:00
|
|
|
fan_data->dev = dev;
|
2010-10-22 06:44:19 +08:00
|
|
|
platform_set_drvdata(pdev, fan_data);
|
|
|
|
mutex_init(&fan_data->lock);
|
|
|
|
|
|
|
|
/* Configure alarm GPIO if available. */
|
2017-09-26 07:09:08 +08:00
|
|
|
if (fan_data->alarm) {
|
|
|
|
err = fan_alarm_init(fan_data);
|
2010-10-22 06:44:19 +08:00
|
|
|
if (err)
|
2012-06-03 00:58:07 +08:00
|
|
|
return err;
|
2010-10-22 06:44:19 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Configure control GPIOs if available. */
|
2017-09-26 07:09:08 +08:00
|
|
|
if (fan_data->ctrl && fan_data->num_ctrl > 0) {
|
|
|
|
if (!fan_data->speed || fan_data->num_speed <= 1)
|
2013-03-31 00:09:39 +08:00
|
|
|
return -EINVAL;
|
2017-09-26 07:09:08 +08:00
|
|
|
err = fan_ctrl_init(fan_data);
|
2010-10-22 06:44:19 +08:00
|
|
|
if (err)
|
2013-03-31 00:09:39 +08:00
|
|
|
return err;
|
2010-10-22 06:44:19 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Make this driver part of hwmon class. */
|
2014-06-14 14:50:50 +08:00
|
|
|
fan_data->hwmon_dev =
|
2017-09-26 07:09:04 +08:00
|
|
|
devm_hwmon_device_register_with_groups(dev,
|
2014-06-14 14:50:50 +08:00
|
|
|
"gpio_fan", fan_data,
|
|
|
|
gpio_fan_groups);
|
2013-07-07 00:46:14 +08:00
|
|
|
if (IS_ERR(fan_data->hwmon_dev))
|
|
|
|
return PTR_ERR(fan_data->hwmon_dev);
|
2017-09-26 07:09:07 +08:00
|
|
|
|
2015-04-09 07:23:52 +08:00
|
|
|
/* Optional cooling device register for Device tree platforms */
|
2017-09-26 07:09:04 +08:00
|
|
|
fan_data->cdev = thermal_of_cooling_device_register(np,
|
2015-04-09 07:23:52 +08:00
|
|
|
"gpio-fan",
|
|
|
|
fan_data,
|
|
|
|
&gpio_fan_cool_ops);
|
2010-10-22 06:44:19 +08:00
|
|
|
|
2017-09-26 07:09:04 +08:00
|
|
|
dev_info(dev, "GPIO fan initialized\n");
|
2010-10-22 06:44:19 +08:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2015-01-09 02:05:03 +08:00
|
|
|
static int gpio_fan_remove(struct platform_device *pdev)
|
2014-12-05 00:58:56 +08:00
|
|
|
{
|
2015-01-09 02:05:03 +08:00
|
|
|
struct gpio_fan_data *fan_data = platform_get_drvdata(pdev);
|
|
|
|
|
|
|
|
if (!IS_ERR(fan_data->cdev))
|
|
|
|
thermal_cooling_device_unregister(fan_data->cdev);
|
2014-12-05 00:58:56 +08:00
|
|
|
|
|
|
|
if (fan_data->ctrl)
|
|
|
|
set_fan_speed(fan_data, 0);
|
2015-01-09 02:05:03 +08:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void gpio_fan_shutdown(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
gpio_fan_remove(pdev);
|
2014-12-05 00:58:56 +08:00
|
|
|
}
|
|
|
|
|
2012-07-08 06:01:03 +08:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
static int gpio_fan_suspend(struct device *dev)
|
2010-10-22 06:44:19 +08:00
|
|
|
{
|
2012-07-08 06:01:03 +08:00
|
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
2010-10-22 06:44:19 +08:00
|
|
|
|
|
|
|
if (fan_data->ctrl) {
|
|
|
|
fan_data->resume_speed = fan_data->speed_index;
|
|
|
|
set_fan_speed(fan_data, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2012-07-08 06:01:03 +08:00
|
|
|
static int gpio_fan_resume(struct device *dev)
|
2010-10-22 06:44:19 +08:00
|
|
|
{
|
2012-07-08 06:01:03 +08:00
|
|
|
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
|
2010-10-22 06:44:19 +08:00
|
|
|
|
|
|
|
if (fan_data->ctrl)
|
|
|
|
set_fan_speed(fan_data, fan_data->resume_speed);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2012-07-08 06:01:03 +08:00
|
|
|
|
|
|
|
static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume);
|
2013-01-10 21:54:40 +08:00
|
|
|
#define GPIO_FAN_PM (&gpio_fan_pm)
|
2010-10-22 06:44:19 +08:00
|
|
|
#else
|
2012-07-08 06:01:03 +08:00
|
|
|
#define GPIO_FAN_PM NULL
|
2010-10-22 06:44:19 +08:00
|
|
|
#endif
|
|
|
|
|
|
|
|
static struct platform_driver gpio_fan_driver = {
|
|
|
|
.probe = gpio_fan_probe,
|
2015-01-09 02:05:03 +08:00
|
|
|
.remove = gpio_fan_remove,
|
2014-12-05 00:58:56 +08:00
|
|
|
.shutdown = gpio_fan_shutdown,
|
2010-10-22 06:44:19 +08:00
|
|
|
.driver = {
|
|
|
|
.name = "gpio-fan",
|
2012-07-08 06:01:03 +08:00
|
|
|
.pm = GPIO_FAN_PM,
|
2012-09-15 00:07:06 +08:00
|
|
|
.of_match_table = of_match_ptr(of_gpio_fan_match),
|
2010-10-22 06:44:19 +08:00
|
|
|
},
|
|
|
|
};
|
|
|
|
|
2011-11-25 15:31:00 +08:00
|
|
|
module_platform_driver(gpio_fan_driver);
|
2010-10-22 06:44:19 +08:00
|
|
|
|
|
|
|
MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
|
|
|
|
MODULE_DESCRIPTION("GPIO FAN driver");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_ALIAS("platform:gpio-fan");
|