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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:
Johan Hovold 2015-05-04 17:10:39 +02:00 committed by Linus Walleij
parent 0f62850808
commit a08f5c21f4
2 changed files with 18 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
drivers/gpio/gpiolib-sysfs.c
View File

@ -12,11 +12,9 @@
struct gpiod_data {
struct gpio_desc *desc;
struct kernfs_node *value_kn;
};
static DEFINE_IDR(dirent_idr);
/* lock protects against unexport_gpio() being called while
* sysfs files are active.
*/
@ -127,9 +125,10 @@ static DEVICE_ATTR_RW(value);
static irqreturn_t gpio_sysfs_irq(int irq, void *priv)
{
struct kernfs_node *value_sd = priv;
struct gpiod_data *data = priv;
sysfs_notify_dirent(data->value_kn);
sysfs_notify_dirent(value_sd);
return IRQ_HANDLED;
}
@ -137,9 +136,8 @@ static int gpio_setup_irq(struct device *dev, unsigned long gpio_flags)
{
struct gpiod_data *data = dev_get_drvdata(dev);
struct gpio_desc *desc = data->desc;
struct kernfs_node *value_sd;
unsigned long irq_flags;
int ret, irq, id;
int ret, irq;
if ((desc->flags & GPIO_TRIGGER_MASK) == gpio_flags)
return 0;
@ -148,17 +146,15 @@ static int gpio_setup_irq(struct device *dev, unsigned long gpio_flags)
if (irq < 0)
return -EIO;
id = desc->flags >> ID_SHIFT;
value_sd = idr_find(&dirent_idr, id);
if (value_sd)
free_irq(irq, value_sd);
if (data->value_kn)
free_irq(irq, data);
desc->flags &= ~GPIO_TRIGGER_MASK;
if (!gpio_flags) {
gpiochip_unlock_as_irq(desc->chip, gpio_chip_hwgpio(desc));
ret = 0;
goto free_id;
goto free_kn;
}
irq_flags = IRQF_SHARED;
@ -169,25 +165,12 @@ static int gpio_setup_irq(struct device *dev, unsigned long gpio_flags)
irq_flags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
if (!value_sd) {
value_sd = sysfs_get_dirent(dev->kobj.sd, "value");
if (!value_sd) {
if (!data->value_kn) {
data->value_kn = sysfs_get_dirent(dev->kobj.sd, "value");
if (!data->value_kn) {
ret = -ENODEV;
goto err_out;
}
ret = idr_alloc(&dirent_idr, value_sd, 1, 0, GFP_KERNEL);
if (ret < 0)
goto free_sd;
id = ret;
desc->flags &= GPIO_FLAGS_MASK;
desc->flags |= (unsigned long)id << ID_SHIFT;
if (desc->flags >> ID_SHIFT != id) {
ret = -ERANGE;
goto free_id;
}
}
/*
@ -200,10 +183,10 @@ static int gpio_setup_irq(struct device *dev, unsigned long gpio_flags)
*/
ret = gpiochip_lock_as_irq(desc->chip, gpio_chip_hwgpio(desc));
if (ret < 0)
goto free_id;
goto free_kn;
ret = request_any_context_irq(irq, gpio_sysfs_irq, irq_flags,
"gpiolib", value_sd);
"gpiolib", data);
if (ret < 0)
goto err_unlock;
@ -212,12 +195,11 @@ static int gpio_setup_irq(struct device *dev, unsigned long gpio_flags)
err_unlock:
gpiochip_unlock_as_irq(desc->chip, gpio_chip_hwgpio(desc));
free_id:
idr_remove(&dirent_idr, id);
desc->flags &= GPIO_FLAGS_MASK;
free_sd:
if (value_sd)
sysfs_put(value_sd);
free_kn:
if (data->value_kn) {
sysfs_put(data->value_kn);
data->value_kn = NULL;
}
err_out:
return ret;
}

3
drivers/gpio/gpiolib.h
View File

@ -92,9 +92,6 @@ struct gpio_desc {
#define FLAG_SYSFS_DIR 10 /* show sysfs direction attribute */
#define FLAG_IS_HOGGED 11 /* GPIO is hogged */
#define ID_SHIFT 16 /* add new flags before this one */
#define GPIO_FLAGS_MASK ((1 << ID_SHIFT) - 1)
#define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
const char *label;