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path: root/drivers/hwmon/gpio-fan.c
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Diffstat (limited to 'drivers/hwmon/gpio-fan.c')
-rw-r--r--drivers/hwmon/gpio-fan.c122
1 files changed, 42 insertions, 80 deletions
diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index 4e04c1228e5..2566c43dd1e 100644
--- a/drivers/hwmon/gpio-fan.c
+++ b/drivers/hwmon/gpio-fan.c
@@ -31,6 +31,7 @@
#include <linux/hwmon.h>
#include <linux/gpio.h>
#include <linux/gpio-fan.h>
+#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
@@ -105,10 +106,6 @@ static int fan_alarm_init(struct gpio_fan_data *fan_data,
if (err)
return err;
- err = device_create_file(&pdev->dev, &dev_attr_fan1_alarm);
- if (err)
- return err;
-
/*
* If the alarm GPIO don't support interrupts, just leave
* without initializing the fail notification support.
@@ -121,23 +118,9 @@ static int fan_alarm_init(struct gpio_fan_data *fan_data,
irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH);
err = devm_request_irq(&pdev->dev, 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);
return err;
}
-static void fan_alarm_free(struct gpio_fan_data *fan_data)
-{
- struct platform_device *pdev = fan_data->pdev;
-
- device_remove_file(&pdev->dev, &dev_attr_fan1_alarm);
-}
-
/*
* Control GPIOs.
*/
@@ -187,7 +170,7 @@ static int get_fan_speed_index(struct gpio_fan_data *fan_data)
dev_warn(&fan_data->pdev->dev,
"missing speed array entry for GPIO value 0x%x\n", ctrl_val);
- return -EINVAL;
+ return -ENODEV;
}
static int rpm_to_speed_index(struct gpio_fan_data *fan_data, int rpm)
@@ -336,8 +319,23 @@ 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,
+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);
+
+ if (index == 0 && !data->alarm)
+ return 0;
+ if (index > 0 && !data->ctrl)
+ return 0;
+
+ return attr->mode;
+}
+
+static struct attribute *gpio_fan_attributes[] = {
+ &dev_attr_fan1_alarm.attr, /* 0 */
+ &dev_attr_pwm1.attr, /* 1 */
&dev_attr_pwm1_enable.attr,
&dev_attr_pwm1_mode.attr,
&dev_attr_fan1_input.attr,
@@ -347,8 +345,14 @@ static struct attribute *gpio_fan_ctrl_attributes[] = {
NULL
};
-static const struct attribute_group gpio_fan_ctrl_group = {
- .attrs = gpio_fan_ctrl_attributes,
+static const struct attribute_group gpio_fan_group = {
+ .attrs = gpio_fan_attributes,
+ .is_visible = gpio_fan_is_visible,
+};
+
+static const struct attribute_group *gpio_fan_groups[] = {
+ &gpio_fan_group,
+ NULL
};
static int fan_ctrl_init(struct gpio_fan_data *fan_data,
@@ -377,32 +381,11 @@ static int fan_ctrl_init(struct gpio_fan_data *fan_data,
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)
- return -ENODEV;
+ return fan_data->speed_index;
- err = sysfs_create_group(&pdev->dev.kobj, &gpio_fan_ctrl_group);
- return err;
-}
-
-static void fan_ctrl_free(struct gpio_fan_data *fan_data)
-{
- struct platform_device *pdev = fan_data->pdev;
-
- sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_ctrl_group);
-}
-
-/*
- * Platform driver.
- */
-
-static ssize_t show_name(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- return sprintf(buf, "gpio-fan\n");
+ return 0;
}
-static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
-
-
#ifdef CONFIG_OF_GPIO
/*
* Translate OpenFirmware node properties into platform_data
@@ -422,7 +405,7 @@ static int gpio_fan_get_of_pdata(struct device *dev,
/* Fill GPIO pin array */
pdata->num_ctrl = of_gpio_count(node);
- if (!pdata->num_ctrl) {
+ if (pdata->num_ctrl <= 0) {
dev_err(dev, "gpios DT property empty / missing");
return -ENODEV;
}
@@ -477,7 +460,7 @@ static int gpio_fan_get_of_pdata(struct device *dev,
pdata->speed = speed;
/* Alarm GPIO if one exists */
- if (of_gpio_named_count(node, "alarm-gpios")) {
+ if (of_gpio_named_count(node, "alarm-gpios") > 0) {
struct gpio_fan_alarm *alarm;
int val;
enum of_gpio_flags flags;
@@ -499,7 +482,7 @@ static int gpio_fan_get_of_pdata(struct device *dev,
return 0;
}
-static struct of_device_id of_gpio_fan_match[] = {
+static const struct of_device_id of_gpio_fan_match[] = {
{ .compatible = "gpio-fan", },
{},
};
@@ -509,7 +492,7 @@ static int 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;
+ struct gpio_fan_platform_data *pdata = dev_get_platdata(&pdev->dev);
#ifdef CONFIG_OF_GPIO
if (!pdata) {
@@ -546,39 +529,23 @@ static int gpio_fan_probe(struct platform_device *pdev)
/* 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;
- }
+ if (!pdata->speed || pdata->num_speed <= 1)
+ return -EINVAL;
err = fan_ctrl_init(fan_data, pdata);
if (err)
- goto err_free_alarm;
+ return err;
}
- 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;
- }
+ fan_data->hwmon_dev = hwmon_device_register_with_groups(&pdev->dev,
+ "gpio_fan", fan_data,
+ gpio_fan_groups);
+ if (IS_ERR(fan_data->hwmon_dev))
+ return PTR_ERR(fan_data->hwmon_dev);
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);
- return err;
}
static int gpio_fan_remove(struct platform_device *pdev)
@@ -586,11 +553,6 @@ static int 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);
return 0;
}
@@ -619,7 +581,7 @@ static int gpio_fan_resume(struct device *dev)
}
static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume);
-#define GPIO_FAN_PM &gpio_fan_pm
+#define GPIO_FAN_PM (&gpio_fan_pm)
#else
#define GPIO_FAN_PM NULL
#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 16:08:56 +0000