]> git.openfabrics.org - ~shefty/rdma-dev.git/commitdiff
hwmon: add generic GPIO fan driver
authorSimon Guinot <sguinot@lacie.com>
Thu, 21 Oct 2010 22:44:19 +0000 (00:44 +0200)
committerGuenter Roeck <guenter.roeck@ericsson.com>
Mon, 25 Oct 2010 21:11:37 +0000 (14:11 -0700)
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>
drivers/hwmon/Kconfig
drivers/hwmon/Makefile
drivers/hwmon/gpio-fan.c [new file with mode: 0644]
include/linux/gpio-fan.h [new file with mode: 0644]

index ec4295fd22f6674a1163749f72f2a81add857f66..c357c835eb1e232387f755553c285e911c793a2a 100644 (file)
@@ -399,6 +399,15 @@ config SENSORS_GL520SM
          This driver can also be built as a module.  If so, the module
          will be called gl520sm.
 
+config SENSORS_GPIO_FAN
+       tristate "GPIO fan"
+       depends on GENERIC_GPIO
+       help
+         If you say yes here you get support for fans connected to GPIO lines.
+
+         This driver can also be built as a module.  If so, the module
+         will be called gpio-fan.
+
 config SENSORS_CORETEMP
        tristate "Intel Core/Core2/Atom temperature sensor"
        depends on X86 && PCI && EXPERIMENTAL
index fc38e7c131f8448e1dd4e995d6c0730a0f67df7f..d30f0f6870e02ff859c6df5d19f3762eb3dc78a1 100644 (file)
@@ -51,6 +51,7 @@ obj-$(CONFIG_SENSORS_FSCHMD)  += fschmd.o
 obj-$(CONFIG_SENSORS_G760A)    += g760a.o
 obj-$(CONFIG_SENSORS_GL518SM)  += gl518sm.o
 obj-$(CONFIG_SENSORS_GL520SM)  += gl520sm.o
+obj-$(CONFIG_SENSORS_GPIO_FAN) += gpio-fan.o
 obj-$(CONFIG_SENSORS_ULTRA45)  += ultra45_env.o
 obj-$(CONFIG_SENSORS_I5K_AMB)  += i5k_amb.o
 obj-$(CONFIG_SENSORS_IBMAEM)   += ibmaem.o
diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
new file mode 100644 (file)
index 0000000..aa701a1
--- /dev/null
@@ -0,0 +1,558 @@
+/*
+ * gpio-fan.c - Hwmon driver for fans connected to GPIO lines.
+ *
+ * Copyright (C) 2010 LaCie
+ *
+ * Author: Simon Guinot <sguinot@lacie.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/hwmon.h>
+#include <linux/gpio.h>
+#include <linux/gpio-fan.h>
+
+struct gpio_fan_data {
+       struct platform_device  *pdev;
+       struct device           *hwmon_dev;
+       struct mutex            lock; /* lock GPIOs operations. */
+       int                     num_ctrl;
+       unsigned                *ctrl;
+       int                     num_speed;
+       struct gpio_fan_speed   *speed;
+       int                     speed_index;
+#ifdef CONFIG_PM
+       int                     resume_speed;
+#endif
+       bool                    pwm_enable;
+       struct gpio_fan_alarm   *alarm;
+       struct work_struct      alarm_work;
+};
+
+/*
+ * Alarm GPIO.
+ */
+
+static void fan_alarm_notify(struct work_struct *ws)
+{
+       struct gpio_fan_data *fan_data =
+               container_of(ws, struct gpio_fan_data, alarm_work);
+
+       sysfs_notify(&fan_data->pdev->dev.kobj, NULL, "fan1_alarm");
+       kobject_uevent(&fan_data->pdev->dev.kobj, KOBJ_CHANGE);
+}
+
+static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id)
+{
+       struct gpio_fan_data *fan_data = dev_id;
+
+       schedule_work(&fan_data->alarm_work);
+
+       return IRQ_NONE;
+}
+
+static ssize_t show_fan_alarm(struct device *dev,
+                             struct device_attribute *attr, char *buf)
+{
+       struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
+       struct gpio_fan_alarm *alarm = fan_data->alarm;
+       int value = gpio_get_value(alarm->gpio);
+
+       if (alarm->active_low)
+               value = !value;
+
+       return sprintf(buf, "%d\n", value);
+}
+
+static DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL);
+
+static int fan_alarm_init(struct gpio_fan_data *fan_data,
+                         struct gpio_fan_alarm *alarm)
+{
+       int err;
+       int alarm_irq;
+       struct platform_device *pdev = fan_data->pdev;
+
+       fan_data->alarm = alarm;
+
+       err = gpio_request(alarm->gpio, "GPIO fan alarm");
+       if (err)
+               return err;
+
+       err = gpio_direction_input(alarm->gpio);
+       if (err)
+               goto err_free_gpio;
+
+       err = device_create_file(&pdev->dev, &dev_attr_fan1_alarm);
+       if (err)
+               goto err_free_gpio;
+
+       /*
+        * If the alarm GPIO don't support interrupts, just leave
+        * without initializing the fail notification support.
+        */
+       alarm_irq = gpio_to_irq(alarm->gpio);
+       if (alarm_irq < 0)
+               return 0;
+
+       INIT_WORK(&fan_data->alarm_work, fan_alarm_notify);
+       set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH);
+       err = request_irq(alarm_irq, fan_alarm_irq_handler, IRQF_SHARED,
+                         "GPIO fan alarm", fan_data);
+       if (err)
+               goto err_free_sysfs;
+
+       return 0;
+
+err_free_sysfs:
+       device_remove_file(&pdev->dev, &dev_attr_fan1_alarm);
+err_free_gpio:
+       gpio_free(alarm->gpio);
+
+       return err;
+}
+
+static void fan_alarm_free(struct gpio_fan_data *fan_data)
+{
+       struct platform_device *pdev = fan_data->pdev;
+       int alarm_irq = gpio_to_irq(fan_data->alarm->gpio);
+
+       if (alarm_irq >= 0)
+               free_irq(alarm_irq, fan_data);
+       device_remove_file(&pdev->dev, &dev_attr_fan1_alarm);
+       gpio_free(fan_data->alarm->gpio);
+}
+
+/*
+ * Control GPIOs.
+ */
+
+/* Must be called with fan_data->lock held, except during initialization. */
+static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val)
+{
+       int i;
+
+       for (i = 0; i < fan_data->num_ctrl; i++)
+               gpio_set_value(fan_data->ctrl[i], (ctrl_val >> i) & 1);
+}
+
+static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
+{
+       int i;
+       int ctrl_val = 0;
+
+       for (i = 0; i < fan_data->num_ctrl; i++) {
+               int value;
+
+               value = gpio_get_value(fan_data->ctrl[i]);
+               ctrl_val |= (value << i);
+       }
+       return ctrl_val;
+}
+
+/* Must be called with fan_data->lock held, except during initialization. */
+static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index)
+{
+       if (fan_data->speed_index == speed_index)
+               return;
+
+       __set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val);
+       fan_data->speed_index = speed_index;
+}
+
+static int get_fan_speed_index(struct gpio_fan_data *fan_data)
+{
+       int ctrl_val = __get_fan_ctrl(fan_data);
+       int i;
+
+       for (i = 0; i < fan_data->num_speed; i++)
+               if (fan_data->speed[i].ctrl_val == ctrl_val)
+                       return i;
+
+       dev_warn(&fan_data->pdev->dev,
+                "missing speed array entry for GPIO value 0x%x\n", ctrl_val);
+
+       return -EINVAL;
+}
+
+static int rpm_to_speed_index(struct gpio_fan_data *fan_data, int rpm)
+{
+       struct gpio_fan_speed *speed = fan_data->speed;
+       int i;
+
+       for (i = 0; i < fan_data->num_speed; i++)
+               if (speed[i].rpm >= rpm)
+                       return i;
+
+       return fan_data->num_speed - 1;
+}
+
+static ssize_t show_pwm(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+       struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
+       u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1);
+
+       return sprintf(buf, "%d\n", pwm);
+}
+
+static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
+                      const char *buf, size_t count)
+{
+       struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
+       unsigned long pwm;
+       int speed_index;
+       int ret = count;
+
+       if (strict_strtoul(buf, 10, &pwm) || pwm > 255)
+               return -EINVAL;
+
+       mutex_lock(&fan_data->lock);
+
+       if (!fan_data->pwm_enable) {
+               ret = -EPERM;
+               goto exit_unlock;
+       }
+
+       speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255);
+       set_fan_speed(fan_data, speed_index);
+
+exit_unlock:
+       mutex_unlock(&fan_data->lock);
+
+       return ret;
+}
+
+static ssize_t show_pwm_enable(struct device *dev,
+                              struct device_attribute *attr, char *buf)
+{
+       struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
+
+       return sprintf(buf, "%d\n", fan_data->pwm_enable);
+}
+
+static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr,
+                             const char *buf, size_t count)
+{
+       struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
+       unsigned long val;
+
+       if (strict_strtoul(buf, 10, &val) || val > 1)
+               return -EINVAL;
+
+       if (fan_data->pwm_enable == val)
+               return count;
+
+       mutex_lock(&fan_data->lock);
+
+       fan_data->pwm_enable = val;
+
+       /* Disable manual control mode: set fan at full speed. */
+       if (val == 0)
+               set_fan_speed(fan_data, fan_data->num_speed - 1);
+
+       mutex_unlock(&fan_data->lock);
+
+       return count;
+}
+
+static ssize_t show_pwm_mode(struct device *dev,
+                            struct device_attribute *attr, char *buf)
+{
+       return sprintf(buf, "0\n");
+}
+
+static ssize_t show_rpm_min(struct device *dev,
+                           struct device_attribute *attr, char *buf)
+{
+       struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
+
+       return sprintf(buf, "%d\n", fan_data->speed[0].rpm);
+}
+
+static ssize_t show_rpm_max(struct device *dev,
+                           struct device_attribute *attr, char *buf)
+{
+       struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
+
+       return sprintf(buf, "%d\n",
+                      fan_data->speed[fan_data->num_speed - 1].rpm);
+}
+
+static ssize_t show_rpm(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+       struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
+
+       return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm);
+}
+
+static ssize_t set_rpm(struct device *dev, struct device_attribute *attr,
+                      const char *buf, size_t count)
+{
+       struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
+       unsigned long rpm;
+       int ret = count;
+
+       if (strict_strtoul(buf, 10, &rpm))
+               return -EINVAL;
+
+       mutex_lock(&fan_data->lock);
+
+       if (!fan_data->pwm_enable) {
+               ret = -EPERM;
+               goto exit_unlock;
+       }
+
+       set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm));
+
+exit_unlock:
+       mutex_unlock(&fan_data->lock);
+
+       return ret;
+}
+
+static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm);
+static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
+                  show_pwm_enable, set_pwm_enable);
+static DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL);
+static DEVICE_ATTR(fan1_min, S_IRUGO, show_rpm_min, NULL);
+static DEVICE_ATTR(fan1_max, S_IRUGO, show_rpm_max, NULL);
+static DEVICE_ATTR(fan1_input, S_IRUGO, show_rpm, NULL);
+static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_rpm, set_rpm);
+
+static struct attribute *gpio_fan_ctrl_attributes[] = {
+       &dev_attr_pwm1.attr,
+       &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
+};
+
+static const struct attribute_group gpio_fan_ctrl_group = {
+       .attrs = gpio_fan_ctrl_attributes,
+};
+
+static int fan_ctrl_init(struct gpio_fan_data *fan_data,
+                        struct gpio_fan_platform_data *pdata)
+{
+       struct platform_device *pdev = fan_data->pdev;
+       int num_ctrl = pdata->num_ctrl;
+       unsigned *ctrl = pdata->ctrl;
+       int i, err;
+
+       for (i = 0; i < num_ctrl; i++) {
+               err = gpio_request(ctrl[i], "GPIO fan control");
+               if (err)
+                       goto err_free_gpio;
+
+               err = gpio_direction_output(ctrl[i], gpio_get_value(ctrl[i]));
+               if (err) {
+                       gpio_free(ctrl[i]);
+                       goto err_free_gpio;
+               }
+       }
+
+       err = sysfs_create_group(&pdev->dev.kobj, &gpio_fan_ctrl_group);
+       if (err)
+               goto err_free_gpio;
+
+       fan_data->num_ctrl = num_ctrl;
+       fan_data->ctrl = ctrl;
+       fan_data->num_speed = pdata->num_speed;
+       fan_data->speed = pdata->speed;
+       fan_data->pwm_enable = true; /* Enable manual fan speed control. */
+       fan_data->speed_index = get_fan_speed_index(fan_data);
+       if (fan_data->speed_index < 0) {
+               err = -ENODEV;
+               goto err_free_gpio;
+       }
+
+       return 0;
+
+err_free_gpio:
+       for (i = i - 1; i >= 0; i--)
+               gpio_free(ctrl[i]);
+
+       return err;
+}
+
+static void fan_ctrl_free(struct gpio_fan_data *fan_data)
+{
+       struct platform_device *pdev = fan_data->pdev;
+       int i;
+
+       sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_ctrl_group);
+       for (i = 0; i < fan_data->num_ctrl; i++)
+               gpio_free(fan_data->ctrl[i]);
+}
+
+/*
+ * Platform driver.
+ */
+
+static ssize_t show_name(struct device *dev,
+                        struct device_attribute *attr, char *buf)
+{
+       return sprintf(buf, "gpio-fan\n");
+}
+
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+static int __devinit gpio_fan_probe(struct platform_device *pdev)
+{
+       int err;
+       struct gpio_fan_data *fan_data;
+       struct gpio_fan_platform_data *pdata = pdev->dev.platform_data;
+
+       if (!pdata)
+               return -EINVAL;
+
+       fan_data = kzalloc(sizeof(struct gpio_fan_data), GFP_KERNEL);
+       if (!fan_data)
+               return -ENOMEM;
+
+       fan_data->pdev = pdev;
+       platform_set_drvdata(pdev, fan_data);
+       mutex_init(&fan_data->lock);
+
+       /* Configure alarm GPIO if available. */
+       if (pdata->alarm) {
+               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");
diff --git a/include/linux/gpio-fan.h b/include/linux/gpio-fan.h
new file mode 100644 (file)
index 0000000..0966591
--- /dev/null
@@ -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 */