hwmon: add generic GPIO fan driver
This patch adds hwmon support for fans connected to GPIO lines. Platform specific information such as GPIO pinout and speed conversion array (rpm from/to GPIO value) are passed to the driver via platform_data. Signed-off-by: Simon Guinot <sguinot@lacie.com> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
This commit is contained in:
Simon Guinot
Guenter Roeck
parent
3247800676
commit
d6fe1360f4
4 changed files with 604 additions and 0 deletions
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@ -399,6 +399,15 @@ config SENSORS_GL520SM
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This driver can also be built as a module. If so, the module
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will be called gl520sm.
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config SENSORS_GPIO_FAN
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tristate "GPIO fan"
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depends on GENERIC_GPIO
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help
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If you say yes here you get support for fans connected to GPIO lines.
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This driver can also be built as a module. If so, the module
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will be called gpio-fan.
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config SENSORS_CORETEMP
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tristate "Intel Core/Core2/Atom temperature sensor"
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depends on X86 && PCI && EXPERIMENTAL
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@ -51,6 +51,7 @@ obj-$(CONFIG_SENSORS_FSCHMD) += fschmd.o
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obj-$(CONFIG_SENSORS_G760A) += g760a.o
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obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o
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obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o
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obj-$(CONFIG_SENSORS_GPIO_FAN) += gpio-fan.o
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obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
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obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
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obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
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558
drivers/hwmon/gpio-fan.c
Normal file
558
drivers/hwmon/gpio-fan.c
Normal file
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@ -0,0 +1,558 @@
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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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#include <linux/gpio-fan.h>
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struct gpio_fan_data {
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struct platform_device *pdev;
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struct device *hwmon_dev;
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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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#ifdef CONFIG_PM
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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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sysfs_notify(&fan_data->pdev->dev.kobj, NULL, "fan1_alarm");
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kobject_uevent(&fan_data->pdev->dev.kobj, KOBJ_CHANGE);
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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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static ssize_t show_fan_alarm(struct device *dev,
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struct device_attribute *attr, char *buf)
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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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int value = gpio_get_value(alarm->gpio);
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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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static DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL);
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static int fan_alarm_init(struct gpio_fan_data *fan_data,
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struct gpio_fan_alarm *alarm)
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{
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int err;
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int alarm_irq;
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struct platform_device *pdev = fan_data->pdev;
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fan_data->alarm = alarm;
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err = gpio_request(alarm->gpio, "GPIO fan alarm");
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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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goto err_free_gpio;
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err = device_create_file(&pdev->dev, &dev_attr_fan1_alarm);
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if (err)
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goto err_free_gpio;
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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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set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH);
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err = request_irq(alarm_irq, fan_alarm_irq_handler, IRQF_SHARED,
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"GPIO fan alarm", fan_data);
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if (err)
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goto err_free_sysfs;
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return 0;
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err_free_sysfs:
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device_remove_file(&pdev->dev, &dev_attr_fan1_alarm);
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err_free_gpio:
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gpio_free(alarm->gpio);
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return err;
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}
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static void fan_alarm_free(struct gpio_fan_data *fan_data)
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{
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struct platform_device *pdev = fan_data->pdev;
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int alarm_irq = gpio_to_irq(fan_data->alarm->gpio);
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if (alarm_irq >= 0)
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free_irq(alarm_irq, fan_data);
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device_remove_file(&pdev->dev, &dev_attr_fan1_alarm);
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gpio_free(fan_data->alarm->gpio);
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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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gpio_set_value(fan_data->ctrl[i], (ctrl_val >> i) & 1);
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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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value = gpio_get_value(fan_data->ctrl[i]);
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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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dev_warn(&fan_data->pdev->dev,
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"missing speed array entry for GPIO value 0x%x\n", ctrl_val);
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return -EINVAL;
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}
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static int rpm_to_speed_index(struct gpio_fan_data *fan_data, int rpm)
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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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static ssize_t show_pwm(struct device *dev,
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struct device_attribute *attr, char *buf)
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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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static ssize_t set_pwm(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 pwm;
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int speed_index;
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int ret = count;
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if (strict_strtoul(buf, 10, &pwm) || pwm > 255)
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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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static ssize_t show_pwm_enable(struct device *dev,
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struct device_attribute *attr, char *buf)
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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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static ssize_t set_pwm_enable(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 val;
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if (strict_strtoul(buf, 10, &val) || val > 1)
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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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static ssize_t show_pwm_mode(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "0\n");
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}
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static ssize_t show_rpm_min(struct device *dev,
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struct device_attribute *attr, char *buf)
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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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static ssize_t show_rpm_max(struct device *dev,
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struct device_attribute *attr, char *buf)
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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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static ssize_t show_rpm(struct device *dev,
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struct device_attribute *attr, char *buf)
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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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if (strict_strtoul(buf, 10, &rpm))
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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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static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm);
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static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
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show_pwm_enable, set_pwm_enable);
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static DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL);
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static DEVICE_ATTR(fan1_min, S_IRUGO, show_rpm_min, NULL);
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static DEVICE_ATTR(fan1_max, S_IRUGO, show_rpm_max, NULL);
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static DEVICE_ATTR(fan1_input, S_IRUGO, show_rpm, NULL);
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static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_rpm, set_rpm);
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static struct attribute *gpio_fan_ctrl_attributes[] = {
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&dev_attr_pwm1.attr,
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&dev_attr_pwm1_enable.attr,
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&dev_attr_pwm1_mode.attr,
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&dev_attr_fan1_input.attr,
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&dev_attr_fan1_target.attr,
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&dev_attr_fan1_min.attr,
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&dev_attr_fan1_max.attr,
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NULL
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};
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static const struct attribute_group gpio_fan_ctrl_group = {
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.attrs = gpio_fan_ctrl_attributes,
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};
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static int fan_ctrl_init(struct gpio_fan_data *fan_data,
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struct gpio_fan_platform_data *pdata)
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{
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struct platform_device *pdev = fan_data->pdev;
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int num_ctrl = pdata->num_ctrl;
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unsigned *ctrl = pdata->ctrl;
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int i, err;
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for (i = 0; i < num_ctrl; i++) {
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err = gpio_request(ctrl[i], "GPIO fan control");
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if (err)
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goto err_free_gpio;
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err = gpio_direction_output(ctrl[i], gpio_get_value(ctrl[i]));
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if (err) {
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gpio_free(ctrl[i]);
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goto err_free_gpio;
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}
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}
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err = sysfs_create_group(&pdev->dev.kobj, &gpio_fan_ctrl_group);
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if (err)
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goto err_free_gpio;
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fan_data->num_ctrl = num_ctrl;
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fan_data->ctrl = ctrl;
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fan_data->num_speed = pdata->num_speed;
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fan_data->speed = pdata->speed;
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fan_data->pwm_enable = true; /* Enable manual fan speed control. */
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fan_data->speed_index = get_fan_speed_index(fan_data);
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if (fan_data->speed_index < 0) {
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err = -ENODEV;
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goto err_free_gpio;
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}
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return 0;
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err_free_gpio:
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for (i = i - 1; i >= 0; i--)
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gpio_free(ctrl[i]);
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return err;
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}
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static void fan_ctrl_free(struct gpio_fan_data *fan_data)
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{
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struct platform_device *pdev = fan_data->pdev;
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int i;
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sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_ctrl_group);
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for (i = 0; i < fan_data->num_ctrl; i++)
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gpio_free(fan_data->ctrl[i]);
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}
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/*
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* Platform driver.
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*/
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static ssize_t show_name(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "gpio-fan\n");
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}
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static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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static int __devinit gpio_fan_probe(struct platform_device *pdev)
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{
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int err;
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struct gpio_fan_data *fan_data;
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struct gpio_fan_platform_data *pdata = pdev->dev.platform_data;
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if (!pdata)
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return -EINVAL;
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fan_data = kzalloc(sizeof(struct gpio_fan_data), GFP_KERNEL);
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if (!fan_data)
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return -ENOMEM;
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fan_data->pdev = pdev;
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platform_set_drvdata(pdev, fan_data);
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mutex_init(&fan_data->lock);
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/* Configure alarm GPIO if available. */
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if (pdata->alarm) {
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err = fan_alarm_init(fan_data, pdata->alarm);
|
||||
if (err)
|
||||
goto err_free_data;
|
||||
}
|
||||
|
||||
/* Configure control GPIOs if available. */
|
||||
if (pdata->ctrl && pdata->num_ctrl > 0) {
|
||||
if (!pdata->speed || pdata->num_speed <= 1) {
|
||||
err = -EINVAL;
|
||||
goto err_free_alarm;
|
||||
}
|
||||
err = fan_ctrl_init(fan_data, pdata);
|
||||
if (err)
|
||||
goto err_free_alarm;
|
||||
}
|
||||
|
||||
err = device_create_file(&pdev->dev, &dev_attr_name);
|
||||
if (err)
|
||||
goto err_free_ctrl;
|
||||
|
||||
/* Make this driver part of hwmon class. */
|
||||
fan_data->hwmon_dev = hwmon_device_register(&pdev->dev);
|
||||
if (IS_ERR(fan_data->hwmon_dev)) {
|
||||
err = PTR_ERR(fan_data->hwmon_dev);
|
||||
goto err_remove_name;
|
||||
}
|
||||
|
||||
dev_info(&pdev->dev, "GPIO fan initialized\n");
|
||||
|
||||
return 0;
|
||||
|
||||
err_remove_name:
|
||||
device_remove_file(&pdev->dev, &dev_attr_name);
|
||||
err_free_ctrl:
|
||||
if (fan_data->ctrl)
|
||||
fan_ctrl_free(fan_data);
|
||||
err_free_alarm:
|
||||
if (fan_data->alarm)
|
||||
fan_alarm_free(fan_data);
|
||||
err_free_data:
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
kfree(fan_data);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __devexit gpio_fan_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct gpio_fan_data *fan_data = platform_get_drvdata(pdev);
|
||||
|
||||
hwmon_device_unregister(fan_data->hwmon_dev);
|
||||
device_remove_file(&pdev->dev, &dev_attr_name);
|
||||
if (fan_data->alarm)
|
||||
fan_alarm_free(fan_data);
|
||||
if (fan_data->ctrl)
|
||||
fan_ctrl_free(fan_data);
|
||||
kfree(fan_data);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int gpio_fan_suspend(struct platform_device *pdev, pm_message_t state)
|
||||
{
|
||||
struct gpio_fan_data *fan_data = platform_get_drvdata(pdev);
|
||||
|
||||
if (fan_data->ctrl) {
|
||||
fan_data->resume_speed = fan_data->speed_index;
|
||||
set_fan_speed(fan_data, 0);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gpio_fan_resume(struct platform_device *pdev)
|
||||
{
|
||||
struct gpio_fan_data *fan_data = platform_get_drvdata(pdev);
|
||||
|
||||
if (fan_data->ctrl)
|
||||
set_fan_speed(fan_data, fan_data->resume_speed);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
#define gpio_fan_suspend NULL
|
||||
#define gpio_fan_resume NULL
|
||||
#endif
|
||||
|
||||
static struct platform_driver gpio_fan_driver = {
|
||||
.probe = gpio_fan_probe,
|
||||
.remove = __devexit_p(gpio_fan_remove),
|
||||
.suspend = gpio_fan_suspend,
|
||||
.resume = gpio_fan_resume,
|
||||
.driver = {
|
||||
.name = "gpio-fan",
|
||||
},
|
||||
};
|
||||
|
||||
static int __init gpio_fan_init(void)
|
||||
{
|
||||
return platform_driver_register(&gpio_fan_driver);
|
||||
}
|
||||
|
||||
static void __exit gpio_fan_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&gpio_fan_driver);
|
||||
}
|
||||
|
||||
module_init(gpio_fan_init);
|
||||
module_exit(gpio_fan_exit);
|
||||
|
||||
MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
|
||||
MODULE_DESCRIPTION("GPIO FAN driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:gpio-fan");
|
||||
36
include/linux/gpio-fan.h
Normal file
36
include/linux/gpio-fan.h
Normal file
|
|
@ -0,0 +1,36 @@
|
|||
/*
|
||||
* include/linux/gpio-fan.h
|
||||
*
|
||||
* Platform data structure for GPIO fan driver
|
||||
*
|
||||
* This file is licensed under the terms of the GNU General Public
|
||||
* License version 2. This program is licensed "as is" without any
|
||||
* warranty of any kind, whether express or implied.
|
||||
*/
|
||||
|
||||
#ifndef __LINUX_GPIO_FAN_H
|
||||
#define __LINUX_GPIO_FAN_H
|
||||
|
||||
struct gpio_fan_alarm {
|
||||
unsigned gpio;
|
||||
unsigned active_low;
|
||||
};
|
||||
|
||||
struct gpio_fan_speed {
|
||||
int rpm;
|
||||
int ctrl_val;
|
||||
};
|
||||
|
||||
struct gpio_fan_platform_data {
|
||||
int num_ctrl;
|
||||
unsigned *ctrl; /* fan control GPIOs. */
|
||||
struct gpio_fan_alarm *alarm; /* fan alarm GPIO. */
|
||||
/*
|
||||
* Speed conversion array: rpm from/to GPIO bit field.
|
||||
* This array _must_ be sorted in ascending rpm order.
|
||||
*/
|
||||
int num_speed;
|
||||
struct gpio_fan_speed *speed;
|
||||
};
|
||||
|
||||
#endif /* __LINUX_GPIO_FAN_H */
|
||||
Loading…
Reference in a new issue