gpio: sysfs: add gpiod class-device data

Add gpiod class-device data.

This is a first step in getting rid of the insane gpio-descriptor flag
overloading, backward irq-interface implementation, and course grained
sysfs-interface locking (a single static mutex for every operation on
all exported gpios in a system).

Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 46 insertions, 16 deletions

diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index 10baf31efe74..097e7e539c9d 100644
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -6,9 +6,14 @@
 #include <linux/gpio/driver.h>
 #include <linux/interrupt.h>
 #include <linux/kdev_t.h>
+#include <linux/slab.h>
 
 #include "gpiolib.h"
 
+struct gpiod_data {
+        struct gpio_desc *desc;
+};
+
 static DEFINE_IDR(dirent_idr);
 
 
@@ -41,7 +46,8 @@ static DEFINE_MUTEX(sysfs_lock);
 static ssize_t direction_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
-        struct gpio_desc        *desc = dev_get_drvdata(dev);
+        struct gpiod_data *data = dev_get_drvdata(dev);
+        struct gpio_desc *desc = data->desc;
         ssize_t                 status;
 
         mutex_lock(&sysfs_lock);
@@ -58,7 +64,8 @@ static ssize_t direction_show(struct device *dev,
 static ssize_t direction_store(struct device *dev,
                 struct device_attribute *attr, const char *buf, size_t size)
 {
-        struct gpio_desc        *desc = dev_get_drvdata(dev);
+        struct gpiod_data *data = dev_get_drvdata(dev);
+        struct gpio_desc *desc = data->desc;
         ssize_t                 status;
 
         mutex_lock(&sysfs_lock);
@@ -80,7 +87,8 @@ static DEVICE_ATTR_RW(direction);
 static ssize_t value_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
-        struct gpio_desc        *desc = dev_get_drvdata(dev);
+        struct gpiod_data *data = dev_get_drvdata(dev);
+        struct gpio_desc *desc = data->desc;
         ssize_t                 status;
 
         mutex_lock(&sysfs_lock);
@@ -94,7 +102,8 @@ static ssize_t value_show(struct device *dev,
 static ssize_t value_store(struct device *dev,
                 struct device_attribute *attr, const char *buf, size_t size)
 {
-        struct gpio_desc        *desc = dev_get_drvdata(dev);
+        struct gpiod_data *data = dev_get_drvdata(dev);
+        struct gpio_desc *desc = data->desc;
         ssize_t                 status;
 
         mutex_lock(&sysfs_lock);
@@ -225,7 +234,8 @@ static const struct {
 static ssize_t edge_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
-        const struct gpio_desc  *desc = dev_get_drvdata(dev);
+        struct gpiod_data *data = dev_get_drvdata(dev);
+        struct gpio_desc *desc = data->desc;
         unsigned long mask;
         ssize_t status = 0;
         int i;
@@ -247,7 +257,8 @@ static ssize_t edge_show(struct device *dev,
 static ssize_t edge_store(struct device *dev,
                 struct device_attribute *attr, const char *buf, size_t size)
 {
-        struct gpio_desc        *desc = dev_get_drvdata(dev);
+        struct gpiod_data *data = dev_get_drvdata(dev);
+        struct gpio_desc *desc = data->desc;
         ssize_t                 status;
         int                     i;
 
@@ -297,7 +308,8 @@ static int sysfs_set_active_low(struct gpio_desc *desc, struct device *dev,
 static ssize_t active_low_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
-        const struct gpio_desc  *desc = dev_get_drvdata(dev);
+        struct gpiod_data *data = dev_get_drvdata(dev);
+        struct gpio_desc *desc = data->desc;
         ssize_t                 status;
 
         mutex_lock(&sysfs_lock);
@@ -313,7 +325,8 @@ static ssize_t active_low_show(struct device *dev,
 static ssize_t active_low_store(struct device *dev,
                 struct device_attribute *attr, const char *buf, size_t size)
 {
-        struct gpio_desc        *desc = dev_get_drvdata(dev);
+        struct gpiod_data *data = dev_get_drvdata(dev);
+        struct gpio_desc *desc = data->desc;
         ssize_t                 status;
         long                    value;
 
@@ -333,7 +346,8 @@ static umode_t gpio_is_visible(struct kobject *kobj, struct attribute *attr,
                                int n)
 {
         struct device *dev = container_of(kobj, struct device, kobj);
-        struct gpio_desc *desc = dev_get_drvdata(dev);
+        struct gpiod_data *data = dev_get_drvdata(dev);
+        struct gpio_desc *desc = data->desc;
         umode_t mode = attr->mode;
         bool show_direction = test_bit(FLAG_SYSFS_DIR, &desc->flags);
 
@@ -525,6 +539,7 @@ static struct class gpio_class = {
 int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
 {
         struct gpio_chip        *chip;
+        struct gpiod_data       *data;
         unsigned long           flags;
         int                     status;
         const char              *ioname = NULL;
@@ -549,7 +564,7 @@ int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
         /* check if chip is being removed */
         if (!chip || !chip->cdev) {
                 status = -ENODEV;
-                goto fail_unlock;
+                goto err_unlock;
         }
 
         spin_lock_irqsave(&gpio_lock, flags);
@@ -561,7 +576,7 @@ int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
                                 test_bit(FLAG_REQUESTED, &desc->flags),
                                 test_bit(FLAG_EXPORT, &desc->flags));
                 status = -EPERM;
-                goto fail_unlock;
+                goto err_unlock;
         }
 
         if (chip->direction_input && chip->direction_output &&
@@ -571,33 +586,45 @@ int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
 
         spin_unlock_irqrestore(&gpio_lock, flags);
 
+        data = kzalloc(sizeof(*data), GFP_KERNEL);
+        if (!data) {
+                status = -ENOMEM;
+                goto err_unlock;
+        }
+
+        data->desc = desc;
+
         offset = gpio_chip_hwgpio(desc);
         if (chip->names && chip->names[offset])
                 ioname = chip->names[offset];
 
         dev = device_create_with_groups(&gpio_class, chip->dev,
-                                        MKDEV(0, 0), desc, gpio_groups,
+                                        MKDEV(0, 0), data, gpio_groups,
                                         ioname ? ioname : "gpio%u",
                                         desc_to_gpio(desc));
         if (IS_ERR(dev)) {
                 status = PTR_ERR(dev);
-                goto fail_unlock;
+                goto err_free_data;
         }
 
         set_bit(FLAG_EXPORT, &desc->flags);
         mutex_unlock(&sysfs_lock);
         return 0;
 
-fail_unlock:
+err_free_data:
+        kfree(data);
+err_unlock:
         mutex_unlock(&sysfs_lock);
         gpiod_dbg(desc, "%s: status %d\n", __func__, status);
         return status;
 }
 EXPORT_SYMBOL_GPL(gpiod_export);
 
-static int match_export(struct device *dev, const void *data)
+static int match_export(struct device *dev, const void *desc)
 {
-        return dev_get_drvdata(dev) == data;
+        struct gpiod_data *data = dev_get_drvdata(dev);
+
+        return data->desc == desc;
 }
 
 /**
@@ -653,6 +680,7 @@ EXPORT_SYMBOL_GPL(gpiod_export_link);
  */
 void gpiod_unexport(struct gpio_desc *desc)
 {
+        struct gpiod_data       *data;
         int                     status = 0;
         struct device           *dev = NULL;
 
@@ -676,6 +704,7 @@ void gpiod_unexport(struct gpio_desc *desc)
         mutex_unlock(&sysfs_lock);
 
         if (dev) {
+                data = dev_get_drvdata(dev);
                 device_unregister(dev);
                 /*
                  * Release irq after deregistration to prevent race with
@@ -683,6 +712,7 @@ void gpiod_unexport(struct gpio_desc *desc)
                  */
                 gpio_setup_irq(desc, dev, 0);
                 put_device(dev);
+                kfree(data);
         }
 
         if (status)