forked from Minki/linux
gpio: sysfs: clean up interrupt-interface implementation
Store the value sysfs entry in the gpiod data rather than in a global table accessed through an index stored in the overloaded gpio-descriptor flag field. Signed-off-by: Johan Hovold <johan@kernel.org> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
parent
0f62850808
commit
a08f5c21f4
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@ -12,11 +12,9 @@
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struct gpiod_data {
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struct gpiod_data {
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struct gpio_desc *desc;
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struct gpio_desc *desc;
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struct kernfs_node *value_kn;
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};
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};
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static DEFINE_IDR(dirent_idr);
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/* lock protects against unexport_gpio() being called while
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/* lock protects against unexport_gpio() being called while
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* sysfs files are active.
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* sysfs files are active.
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*/
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*/
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@ -127,9 +125,10 @@ static DEVICE_ATTR_RW(value);
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static irqreturn_t gpio_sysfs_irq(int irq, void *priv)
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static irqreturn_t gpio_sysfs_irq(int irq, void *priv)
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{
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{
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struct kernfs_node *value_sd = priv;
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struct gpiod_data *data = priv;
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sysfs_notify_dirent(data->value_kn);
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sysfs_notify_dirent(value_sd);
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return IRQ_HANDLED;
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return IRQ_HANDLED;
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}
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}
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@ -137,9 +136,8 @@ static int gpio_setup_irq(struct device *dev, unsigned long gpio_flags)
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{
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{
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struct gpiod_data *data = dev_get_drvdata(dev);
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struct gpiod_data *data = dev_get_drvdata(dev);
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struct gpio_desc *desc = data->desc;
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struct gpio_desc *desc = data->desc;
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struct kernfs_node *value_sd;
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unsigned long irq_flags;
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unsigned long irq_flags;
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int ret, irq, id;
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int ret, irq;
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if ((desc->flags & GPIO_TRIGGER_MASK) == gpio_flags)
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if ((desc->flags & GPIO_TRIGGER_MASK) == gpio_flags)
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return 0;
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return 0;
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@ -148,17 +146,15 @@ static int gpio_setup_irq(struct device *dev, unsigned long gpio_flags)
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if (irq < 0)
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if (irq < 0)
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return -EIO;
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return -EIO;
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id = desc->flags >> ID_SHIFT;
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if (data->value_kn)
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value_sd = idr_find(&dirent_idr, id);
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free_irq(irq, data);
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if (value_sd)
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free_irq(irq, value_sd);
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desc->flags &= ~GPIO_TRIGGER_MASK;
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desc->flags &= ~GPIO_TRIGGER_MASK;
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if (!gpio_flags) {
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if (!gpio_flags) {
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gpiochip_unlock_as_irq(desc->chip, gpio_chip_hwgpio(desc));
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gpiochip_unlock_as_irq(desc->chip, gpio_chip_hwgpio(desc));
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ret = 0;
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ret = 0;
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goto free_id;
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goto free_kn;
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}
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}
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irq_flags = IRQF_SHARED;
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irq_flags = IRQF_SHARED;
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@ -169,25 +165,12 @@ static int gpio_setup_irq(struct device *dev, unsigned long gpio_flags)
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irq_flags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
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irq_flags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
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IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
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IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
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if (!value_sd) {
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if (!data->value_kn) {
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value_sd = sysfs_get_dirent(dev->kobj.sd, "value");
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data->value_kn = sysfs_get_dirent(dev->kobj.sd, "value");
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if (!value_sd) {
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if (!data->value_kn) {
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ret = -ENODEV;
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ret = -ENODEV;
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goto err_out;
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goto err_out;
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}
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}
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ret = idr_alloc(&dirent_idr, value_sd, 1, 0, GFP_KERNEL);
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if (ret < 0)
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goto free_sd;
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id = ret;
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desc->flags &= GPIO_FLAGS_MASK;
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desc->flags |= (unsigned long)id << ID_SHIFT;
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if (desc->flags >> ID_SHIFT != id) {
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ret = -ERANGE;
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goto free_id;
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}
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}
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}
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/*
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/*
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@ -200,10 +183,10 @@ static int gpio_setup_irq(struct device *dev, unsigned long gpio_flags)
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*/
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*/
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ret = gpiochip_lock_as_irq(desc->chip, gpio_chip_hwgpio(desc));
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ret = gpiochip_lock_as_irq(desc->chip, gpio_chip_hwgpio(desc));
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if (ret < 0)
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if (ret < 0)
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goto free_id;
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goto free_kn;
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ret = request_any_context_irq(irq, gpio_sysfs_irq, irq_flags,
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ret = request_any_context_irq(irq, gpio_sysfs_irq, irq_flags,
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"gpiolib", value_sd);
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"gpiolib", data);
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if (ret < 0)
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if (ret < 0)
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goto err_unlock;
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goto err_unlock;
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@ -212,12 +195,11 @@ static int gpio_setup_irq(struct device *dev, unsigned long gpio_flags)
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err_unlock:
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err_unlock:
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gpiochip_unlock_as_irq(desc->chip, gpio_chip_hwgpio(desc));
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gpiochip_unlock_as_irq(desc->chip, gpio_chip_hwgpio(desc));
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free_id:
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free_kn:
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idr_remove(&dirent_idr, id);
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if (data->value_kn) {
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desc->flags &= GPIO_FLAGS_MASK;
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sysfs_put(data->value_kn);
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free_sd:
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data->value_kn = NULL;
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if (value_sd)
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}
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sysfs_put(value_sd);
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err_out:
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err_out:
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return ret;
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return ret;
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}
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}
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@ -92,9 +92,6 @@ struct gpio_desc {
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#define FLAG_SYSFS_DIR 10 /* show sysfs direction attribute */
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#define FLAG_SYSFS_DIR 10 /* show sysfs direction attribute */
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#define FLAG_IS_HOGGED 11 /* GPIO is hogged */
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#define FLAG_IS_HOGGED 11 /* GPIO is hogged */
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#define ID_SHIFT 16 /* add new flags before this one */
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#define GPIO_FLAGS_MASK ((1 << ID_SHIFT) - 1)
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#define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
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#define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
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const char *label;
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const char *label;
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