From c81cc5a4c14d8d7cc5c891ddf6cb8e7750a44dee Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Sat, 30 Mar 2013 09:09:39 -0700 Subject: hwmon: (gpio-fan) Use is_visible to determine if attributes should be created Simplify code and reduce object size by more than 300 bytes (x86_64). Cc: Jamie Lentin Cc: Simon Guinot Tested-by: Simon Guinot Signed-off-by: Guenter Roeck --- drivers/hwmon/gpio-fan.c | 104 ++++++++++++++++++----------------------------- 1 file changed, 39 insertions(+), 65 deletions(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c index 4e02480b456..3104149795c 100644 --- a/drivers/hwmon/gpio-fan.c +++ b/drivers/hwmon/gpio-fan.c @@ -105,10 +105,6 @@ 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 +117,9 @@ 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. */ @@ -327,6 +309,12 @@ exit_unlock: return ret; } +static ssize_t show_name(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "gpio-fan\n"); +} + 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); @@ -336,8 +324,26 @@ 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 DEVICE_ATTR(name, S_IRUGO, show_name, NULL); + +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 == 1 && !data->alarm) + return 0; + if (index > 1 && !data->ctrl) + return 0; + + return attr->mode; +} + +static struct attribute *gpio_fan_attributes[] = { + &dev_attr_name.attr, + &dev_attr_fan1_alarm.attr, /* 1 */ + &dev_attr_pwm1.attr, /* 2 */ &dev_attr_pwm1_enable.attr, &dev_attr_pwm1_mode.attr, &dev_attr_fan1_input.attr, @@ -347,8 +353,9 @@ 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 int fan_ctrl_init(struct gpio_fan_data *fan_data, @@ -379,30 +386,9 @@ static int fan_ctrl_init(struct gpio_fan_data *fan_data, if (fan_data->speed_index < 0) return -ENODEV; - 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 @@ -546,38 +532,30 @@ 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); + err = sysfs_create_group(&pdev->dev.kobj, &gpio_fan_group); if (err) - goto err_free_ctrl; + return err; /* 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; + goto err_remove; } 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_remove: + sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_group); return err; } @@ -586,11 +564,7 @@ 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); + sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_group); return 0; } -- cgit v1.2.3-70-g09d2