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path: root/drivers/gpio/gpiolib.c
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Diffstat (limited to 'drivers/gpio/gpiolib.c')
-rw-r--r--drivers/gpio/gpiolib.c822
1 files changed, 605 insertions, 217 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 5c1ba879f889..72065532c1c7 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -16,6 +16,11 @@
#include <linux/gpio/driver.h>
#include <linux/gpio/machine.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/idr.h>
+#include <linux/cdev.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <uapi/linux/gpio.h>
#include "gpiolib.h"
@@ -42,6 +47,14 @@
#define extra_checks 0
#endif
+/* Device and char device-related information */
+static DEFINE_IDA(gpio_ida);
+static dev_t gpio_devt;
+#define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */
+static struct bus_type gpio_bus_type = {
+ .name = "gpio",
+};
+
/* gpio_lock prevents conflicts during gpio_desc[] table updates.
* While any GPIO is requested, its gpio_chip is not removable;
* each GPIO's "requested" flag serves as a lock and refcount.
@@ -50,8 +63,7 @@ DEFINE_SPINLOCK(gpio_lock);
static DEFINE_MUTEX(gpio_lookup_lock);
static LIST_HEAD(gpio_lookup_list);
-LIST_HEAD(gpio_chips);
-
+LIST_HEAD(gpio_devices);
static void gpiochip_free_hogs(struct gpio_chip *chip);
static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip);
@@ -67,15 +79,16 @@ static inline void desc_set_label(struct gpio_desc *d, const char *label)
*/
struct gpio_desc *gpio_to_desc(unsigned gpio)
{
- struct gpio_chip *chip;
+ struct gpio_device *gdev;
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
- list_for_each_entry(chip, &gpio_chips, list) {
- if (chip->base <= gpio && chip->base + chip->ngpio > gpio) {
+ list_for_each_entry(gdev, &gpio_devices, list) {
+ if (gdev->base <= gpio &&
+ gdev->base + gdev->ngpio > gpio) {
spin_unlock_irqrestore(&gpio_lock, flags);
- return &chip->desc[gpio - chip->base];
+ return &gdev->descs[gpio - gdev->base];
}
}
@@ -94,10 +107,12 @@ EXPORT_SYMBOL_GPL(gpio_to_desc);
struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
u16 hwnum)
{
- if (hwnum >= chip->ngpio)
+ struct gpio_device *gdev = chip->gpiodev;
+
+ if (hwnum >= gdev->ngpio)
return ERR_PTR(-EINVAL);
- return &chip->desc[hwnum];
+ return &gdev->descs[hwnum];
}
/**
@@ -107,7 +122,7 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
*/
int desc_to_gpio(const struct gpio_desc *desc)
{
- return desc->chip->base + (desc - &desc->chip->desc[0]);
+ return desc->gdev->base + (desc - &desc->gdev->descs[0]);
}
EXPORT_SYMBOL_GPL(desc_to_gpio);
@@ -118,23 +133,25 @@ EXPORT_SYMBOL_GPL(desc_to_gpio);
*/
struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
{
- return desc ? desc->chip : NULL;
+ if (!desc || !desc->gdev || !desc->gdev->chip)
+ return NULL;
+ return desc->gdev->chip;
}
EXPORT_SYMBOL_GPL(gpiod_to_chip);
/* dynamic allocation of GPIOs, e.g. on a hotplugged device */
static int gpiochip_find_base(int ngpio)
{
- struct gpio_chip *chip;
+ struct gpio_device *gdev;
int base = ARCH_NR_GPIOS - ngpio;
- list_for_each_entry_reverse(chip, &gpio_chips, list) {
+ list_for_each_entry_reverse(gdev, &gpio_devices, list) {
/* found a free space? */
- if (chip->base + chip->ngpio <= base)
+ if (gdev->base + gdev->ngpio <= base)
break;
else
/* nope, check the space right before the chip */
- base = chip->base - ngpio;
+ base = gdev->base - ngpio;
}
if (gpio_is_valid(base)) {
@@ -187,57 +204,45 @@ EXPORT_SYMBOL_GPL(gpiod_get_direction);
* Return -EBUSY if the new chip overlaps with some other chip's integer
* space.
*/
-static int gpiochip_add_to_list(struct gpio_chip *chip)
+static int gpiodev_add_to_list(struct gpio_device *gdev)
{
- struct gpio_chip *iterator;
- struct gpio_chip *previous = NULL;
+ struct gpio_device *prev, *next;
- if (list_empty(&gpio_chips)) {
- list_add_tail(&chip->list, &gpio_chips);
+ if (list_empty(&gpio_devices)) {
+ /* initial entry in list */
+ list_add_tail(&gdev->list, &gpio_devices);
return 0;
}
- list_for_each_entry(iterator, &gpio_chips, list) {
- if (iterator->base >= chip->base + chip->ngpio) {
- /*
- * Iterator is the first GPIO chip so there is no
- * previous one
- */
- if (!previous) {
- goto found;
- } else {
- /*
- * We found a valid range(means
- * [base, base + ngpio - 1]) between previous
- * and iterator chip.
- */
- if (previous->base + previous->ngpio
- <= chip->base)
- goto found;
- }
- }
- previous = iterator;
+ next = list_entry(gpio_devices.next, struct gpio_device, list);
+ if (gdev->base + gdev->ngpio <= next->base) {
+ /* add before first entry */
+ list_add(&gdev->list, &gpio_devices);
+ return 0;
}
- /*
- * We are beyond the last chip in the list and iterator now
- * points to the head.
- * Let iterator point to the last chip in the list.
- */
-
- iterator = list_last_entry(&gpio_chips, struct gpio_chip, list);
- if (iterator->base + iterator->ngpio <= chip->base) {
- list_add(&chip->list, &iterator->list);
+ prev = list_entry(gpio_devices.prev, struct gpio_device, list);
+ if (prev->base + prev->ngpio <= gdev->base) {
+ /* add behind last entry */
+ list_add_tail(&gdev->list, &gpio_devices);
return 0;
}
- dev_err(chip->parent,
- "GPIO integer space overlap, cannot add chip\n");
- return -EBUSY;
+ list_for_each_entry_safe(prev, next, &gpio_devices, list) {
+ /* at the end of the list */
+ if (&next->list == &gpio_devices)
+ break;
-found:
- list_add_tail(&chip->list, &iterator->list);
- return 0;
+ /* add between prev and next */
+ if (prev->base + prev->ngpio <= gdev->base
+ && gdev->base + gdev->ngpio <= next->base) {
+ list_add(&gdev->list, &prev->list);
+ return 0;
+ }
+ }
+
+ dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n");
+ return -EBUSY;
}
/**
@@ -245,23 +250,23 @@ found:
*/
static struct gpio_desc *gpio_name_to_desc(const char * const name)
{
- struct gpio_chip *chip;
+ struct gpio_device *gdev;
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
- list_for_each_entry(chip, &gpio_chips, list) {
+ list_for_each_entry(gdev, &gpio_devices, list) {
int i;
- for (i = 0; i != chip->ngpio; ++i) {
- struct gpio_desc *gpio = &chip->desc[i];
+ for (i = 0; i != gdev->ngpio; ++i) {
+ struct gpio_desc *desc = &gdev->descs[i];
- if (!gpio->name || !name)
+ if (!desc->name || !name)
continue;
- if (!strcmp(gpio->name, name)) {
+ if (!strcmp(desc->name, name)) {
spin_unlock_irqrestore(&gpio_lock, flags);
- return gpio;
+ return desc;
}
}
}
@@ -279,6 +284,7 @@ static struct gpio_desc *gpio_name_to_desc(const char * const name)
*/
static int gpiochip_set_desc_names(struct gpio_chip *gc)
{
+ struct gpio_device *gdev = gc->gpiodev;
int i;
if (!gc->names)
@@ -290,18 +296,153 @@ static int gpiochip_set_desc_names(struct gpio_chip *gc)
gpio = gpio_name_to_desc(gc->names[i]);
if (gpio)
- dev_warn(gc->parent, "Detected name collision for "
- "GPIO name '%s'\n",
+ dev_warn(&gdev->dev,
+ "Detected name collision for GPIO name '%s'\n",
gc->names[i]);
}
/* Then add all names to the GPIO descriptors */
for (i = 0; i != gc->ngpio; ++i)
- gc->desc[i].name = gc->names[i];
+ gdev->descs[i].name = gc->names[i];
+
+ return 0;
+}
+
+/**
+ * gpio_ioctl() - ioctl handler for the GPIO chardev
+ */
+static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct gpio_device *gdev = filp->private_data;
+ struct gpio_chip *chip = gdev->chip;
+ int __user *ip = (int __user *)arg;
+
+ /* We fail any subsequent ioctl():s when the chip is gone */
+ if (!chip)
+ return -ENODEV;
+
+ /* Fill in the struct and pass to userspace */
+ if (cmd == GPIO_GET_CHIPINFO_IOCTL) {
+ struct gpiochip_info chipinfo;
+
+ strncpy(chipinfo.name, dev_name(&gdev->dev),
+ sizeof(chipinfo.name));
+ chipinfo.name[sizeof(chipinfo.name)-1] = '\0';
+ strncpy(chipinfo.label, gdev->label,
+ sizeof(chipinfo.label));
+ chipinfo.label[sizeof(chipinfo.label)-1] = '\0';
+ chipinfo.lines = gdev->ngpio;
+ if (copy_to_user(ip, &chipinfo, sizeof(chipinfo)))
+ return -EFAULT;
+ return 0;
+ } else if (cmd == GPIO_GET_LINEINFO_IOCTL) {
+ struct gpioline_info lineinfo;
+ struct gpio_desc *desc;
+
+ if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
+ return -EFAULT;
+ if (lineinfo.line_offset > gdev->ngpio)
+ return -EINVAL;
+
+ desc = &gdev->descs[lineinfo.line_offset];
+ if (desc->name) {
+ strncpy(lineinfo.name, desc->name,
+ sizeof(lineinfo.name));
+ lineinfo.name[sizeof(lineinfo.name)-1] = '\0';
+ } else {
+ lineinfo.name[0] = '\0';
+ }
+ if (desc->label) {
+ strncpy(lineinfo.consumer, desc->label,
+ sizeof(lineinfo.consumer));
+ lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0';
+ } else {
+ lineinfo.consumer[0] = '\0';
+ }
+
+ /*
+ * Userspace only need to know that the kernel is using
+ * this GPIO so it can't use it.
+ */
+ lineinfo.flags = 0;
+ if (test_bit(FLAG_REQUESTED, &desc->flags) ||
+ test_bit(FLAG_IS_HOGGED, &desc->flags) ||
+ test_bit(FLAG_USED_AS_IRQ, &desc->flags) ||
+ test_bit(FLAG_EXPORT, &desc->flags) ||
+ test_bit(FLAG_SYSFS, &desc->flags))
+ lineinfo.flags |= GPIOLINE_FLAG_KERNEL;
+ if (test_bit(FLAG_IS_OUT, &desc->flags))
+ lineinfo.flags |= GPIOLINE_FLAG_IS_OUT;
+ if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
+ lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW;
+ if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
+ lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN;
+ if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
+ lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE;
+
+ if (copy_to_user(ip, &lineinfo, sizeof(lineinfo)))
+ return -EFAULT;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+/**
+ * gpio_chrdev_open() - open the chardev for ioctl operations
+ * @inode: inode for this chardev
+ * @filp: file struct for storing private data
+ * Returns 0 on success
+ */
+static int gpio_chrdev_open(struct inode *inode, struct file *filp)
+{
+ struct gpio_device *gdev = container_of(inode->i_cdev,
+ struct gpio_device, chrdev);
+
+ /* Fail on open if the backing gpiochip is gone */
+ if (!gdev || !gdev->chip)
+ return -ENODEV;
+ get_device(&gdev->dev);
+ filp->private_data = gdev;
+ return 0;
+}
+/**
+ * gpio_chrdev_release() - close chardev after ioctl operations
+ * @inode: inode for this chardev
+ * @filp: file struct for storing private data
+ * Returns 0 on success
+ */
+static int gpio_chrdev_release(struct inode *inode, struct file *filp)
+{
+ struct gpio_device *gdev = container_of(inode->i_cdev,
+ struct gpio_device, chrdev);
+
+ if (!gdev)
+ return -ENODEV;
+ put_device(&gdev->dev);
return 0;
}
+
+static const struct file_operations gpio_fileops = {
+ .release = gpio_chrdev_release,
+ .open = gpio_chrdev_open,
+ .owner = THIS_MODULE,
+ .llseek = noop_llseek,
+ .unlocked_ioctl = gpio_ioctl,
+ .compat_ioctl = gpio_ioctl,
+};
+
+static void gpiodevice_release(struct device *dev)
+{
+ struct gpio_device *gdev = dev_get_drvdata(dev);
+
+ cdev_del(&gdev->chrdev);
+ list_del(&gdev->list);
+ ida_simple_remove(&gpio_ida, gdev->id);
+ kfree(gdev);
+}
+
/**
* gpiochip_add_data() - register a gpio_chip
* @chip: the chip to register, with chip->base initialized
@@ -323,43 +464,107 @@ int gpiochip_add_data(struct gpio_chip *chip, void *data)
{
unsigned long flags;
int status = 0;
- unsigned id;
+ unsigned i;
int base = chip->base;
- struct gpio_desc *descs;
+ struct gpio_device *gdev;
- descs = kcalloc(chip->ngpio, sizeof(descs[0]), GFP_KERNEL);
- if (!descs)
+ /*
+ * First: allocate and populate the internal stat container, and
+ * set up the struct device.
+ */
+ gdev = kzalloc(sizeof(*gdev), GFP_KERNEL);
+ if (!gdev)
return -ENOMEM;
+ gdev->dev.bus = &gpio_bus_type;
+ gdev->chip = chip;
+ chip->gpiodev = gdev;
+ if (chip->parent) {
+ gdev->dev.parent = chip->parent;
+ gdev->dev.of_node = chip->parent->of_node;
+ } else {
+#ifdef CONFIG_OF_GPIO
+ /* If the gpiochip has an assigned OF node this takes precedence */
+ if (chip->of_node)
+ gdev->dev.of_node = chip->of_node;
+#endif
+ }
+ gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL);
+ if (gdev->id < 0) {
+ status = gdev->id;
+ goto err_free_gdev;
+ }
+ dev_set_name(&gdev->dev, "gpiochip%d", gdev->id);
+ device_initialize(&gdev->dev);
+ dev_set_drvdata(&gdev->dev, gdev);
+ if (chip->parent && chip->parent->driver)
+ gdev->owner = chip->parent->driver->owner;
+ else if (chip->owner)
+ /* TODO: remove chip->owner */
+ gdev->owner = chip->owner;
+ else
+ gdev->owner = THIS_MODULE;
- chip->data = data;
+ gdev->descs = devm_kcalloc(&gdev->dev, chip->ngpio,
+ sizeof(gdev->descs[0]), GFP_KERNEL);
+ if (!gdev->descs) {
+ status = -ENOMEM;
+ goto err_free_gdev;
+ }
if (chip->ngpio == 0) {
chip_err(chip, "tried to insert a GPIO chip with zero lines\n");
- return -EINVAL;
+ status = -EINVAL;
+ goto err_free_gdev;
}
+ if (chip->label)
+ gdev->label = devm_kstrdup(&gdev->dev, chip->label, GFP_KERNEL);
+ else
+ gdev->label = devm_kstrdup(&gdev->dev, "unknown", GFP_KERNEL);
+ if (!gdev->label) {
+ status = -ENOMEM;
+ goto err_free_gdev;
+ }
+
+ gdev->ngpio = chip->ngpio;
+ gdev->data = data;
+
spin_lock_irqsave(&gpio_lock, flags);
+ /*
+ * TODO: this allocates a Linux GPIO number base in the global
+ * GPIO numberspace for this chip. In the long run we want to
+ * get *rid* of this numberspace and use only descriptors, but
+ * it may be a pipe dream. It will not happen before we get rid
+ * of the sysfs interface anyways.
+ */
if (base < 0) {
base = gpiochip_find_base(chip->ngpio);
if (base < 0) {
status = base;
spin_unlock_irqrestore(&gpio_lock, flags);
- goto err_free_descs;
+ goto err_free_gdev;
}
+ /*
+ * TODO: it should not be necessary to reflect the assigned
+ * base outside of the GPIO subsystem. Go over drivers and
+ * see if anyone makes use of this, else drop this and assign
+ * a poison instead.
+ */
chip->base = base;
}
+ gdev->base = base;
- status = gpiochip_add_to_list(chip);
+ status = gpiodev_add_to_list(gdev);
if (status) {
spin_unlock_irqrestore(&gpio_lock, flags);
- goto err_free_descs;
+ goto err_free_gdev;
}
- for (id = 0; id < chip->ngpio; id++) {
- struct gpio_desc *desc = &descs[id];
+ for (i = 0; i < chip->ngpio; i++) {
+ struct gpio_desc *desc = &gdev->descs[i];
- desc->chip = chip;
+ desc->gdev = gdev;
/* REVISIT: most hardware initializes GPIOs as inputs (often
* with pullups enabled) so power usage is minimized. Linux
@@ -370,17 +575,12 @@ int gpiochip_add_data(struct gpio_chip *chip, void *data)
desc->flags = !chip->direction_input ? (1 << FLAG_IS_OUT) : 0;
}
- chip->desc = descs;
-
spin_unlock_irqrestore(&gpio_lock, flags);
#ifdef CONFIG_PINCTRL
- INIT_LIST_HEAD(&chip->pin_ranges);
+ INIT_LIST_HEAD(&gdev->pin_ranges);
#endif
- if (!chip->owner && chip->parent && chip->parent->driver)
- chip->owner = chip->parent->driver->owner;
-
status = gpiochip_set_desc_names(chip);
if (status)
goto err_remove_from_list;
@@ -391,37 +591,73 @@ int gpiochip_add_data(struct gpio_chip *chip, void *data)
acpi_gpiochip_add(chip);
- status = gpiochip_sysfs_register(chip);
+ /*
+ * By first adding the chardev, and then adding the device,
+ * we get a device node entry in sysfs under
+ * /sys/bus/gpio/devices/gpiochipN/dev that can be used for
+ * coldplug of device nodes and other udev business.
+ */
+ cdev_init(&gdev->chrdev, &gpio_fileops);
+ gdev->chrdev.owner = THIS_MODULE;
+ gdev->chrdev.kobj.parent = &gdev->dev.kobj;
+ gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id);
+ status = cdev_add(&gdev->chrdev, gdev->dev.devt, 1);
+ if (status < 0)
+ chip_warn(chip, "failed to add char device %d:%d\n",
+ MAJOR(gpio_devt), gdev->id);
+ else
+ chip_dbg(chip, "added GPIO chardev (%d:%d)\n",
+ MAJOR(gpio_devt), gdev->id);
+ status = device_add(&gdev->dev);
if (status)
- goto err_remove_chip;
+ goto err_remove_chardev;
+
+ status = gpiochip_sysfs_register(gdev);
+ if (status)
+ goto err_remove_device;
- pr_debug("%s: registered GPIOs %d to %d on device: %s\n", __func__,
- chip->base, chip->base + chip->ngpio - 1,
- chip->label ? : "generic");
+ /* From this point, the .release() function cleans up gpio_device */
+ gdev->dev.release = gpiodevice_release;
+ get_device(&gdev->dev);
+ pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n",
+ __func__, gdev->base, gdev->base + gdev->ngpio - 1,
+ dev_name(&gdev->dev), chip->label ? : "generic");
return 0;
+err_remove_device:
+ device_del(&gdev->dev);
+err_remove_chardev:
+ cdev_del(&gdev->chrdev);
err_remove_chip:
acpi_gpiochip_remove(chip);
gpiochip_free_hogs(chip);
of_gpiochip_remove(chip);
err_remove_from_list:
spin_lock_irqsave(&gpio_lock, flags);
- list_del(&chip->list);
+ list_del(&gdev->list);
spin_unlock_irqrestore(&gpio_lock, flags);
- chip->desc = NULL;
-err_free_descs:
- kfree(descs);
-
+err_free_gdev:
+ ida_simple_remove(&gpio_ida, gdev->id);
/* failures here can mean systems won't boot... */
pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__,
- chip->base, chip->base + chip->ngpio - 1,
- chip->label ? : "generic");
+ gdev->base, gdev->base + gdev->ngpio - 1,
+ chip->label ? : "generic");
+ kfree(gdev);
return status;
}
EXPORT_SYMBOL_GPL(gpiochip_add_data);
/**
+ * gpiochip_get_data() - get per-subdriver data for the chip
+ */
+void *gpiochip_get_data(struct gpio_chip *chip)
+{
+ return chip->gpiodev->data;
+}
+EXPORT_SYMBOL_GPL(gpiochip_get_data);
+
+/**
* gpiochip_remove() - unregister a gpio_chip
* @chip: the chip to unregister
*
@@ -429,39 +665,123 @@ EXPORT_SYMBOL_GPL(gpiochip_add_data);
*/
void gpiochip_remove(struct gpio_chip *chip)
{
+ struct gpio_device *gdev = chip->gpiodev;
struct gpio_desc *desc;
unsigned long flags;
- unsigned id;
+ unsigned i;
bool requested = false;
- gpiochip_sysfs_unregister(chip);
-
+ /* FIXME: should the legacy sysfs handling be moved to gpio_device? */
+ gpiochip_sysfs_unregister(gdev);
+ /* Numb the device, cancelling all outstanding operations */
+ gdev->chip = NULL;
gpiochip_irqchip_remove(chip);
-
acpi_gpiochip_remove(chip);
gpiochip_remove_pin_ranges(chip);
gpiochip_free_hogs(chip);
of_gpiochip_remove(chip);
+ /*
+ * We accept no more calls into the driver from this point, so
+ * NULL the driver data pointer
+ */
+ gdev->data = NULL;
spin_lock_irqsave(&gpio_lock, flags);
- for (id = 0; id < chip->ngpio; id++) {
- desc = &chip->desc[id];
- desc->chip = NULL;
+ for (i = 0; i < gdev->ngpio; i++) {
+ desc = &gdev->descs[i];
if (test_bit(FLAG_REQUESTED, &desc->flags))
requested = true;
}
- list_del(&chip->list);
spin_unlock_irqrestore(&gpio_lock, flags);
if (requested)
- dev_crit(chip->parent,
+ dev_crit(&gdev->dev,
"REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n");
- kfree(chip->desc);
- chip->desc = NULL;
+ /*
+ * The gpiochip side puts its use of the device to rest here:
+ * if there are no userspace clients, the chardev and device will
+ * be removed, else it will be dangling until the last user is
+ * gone.
+ */
+ put_device(&gdev->dev);
}
EXPORT_SYMBOL_GPL(gpiochip_remove);
+static void devm_gpio_chip_release(struct device *dev, void *res)
+{
+ struct gpio_chip *chip = *(struct gpio_chip **)res;
+
+ gpiochip_remove(chip);
+}
+
+static int devm_gpio_chip_match(struct device *dev, void *res, void *data)
+
+{
+ struct gpio_chip **r = res;
+
+ if (!r || !*r) {
+ WARN_ON(!r || !*r);
+ return 0;
+ }
+
+ return *r == data;
+}
+
+/**
+ * devm_gpiochip_add_data() - Resource manager piochip_add_data()
+ * @dev: the device pointer on which irq_chip belongs to.
+ * @chip: the chip to register, with chip->base initialized
+ * Context: potentially before irqs will work
+ *
+ * Returns a negative errno if the chip can't be registered, such as
+ * because the chip->base is invalid or already associated with a
+ * different chip. Otherwise it returns zero as a success code.
+ *
+ * The gpio chip automatically be released when the device is unbound.
+ */
+int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip,
+ void *data)
+{
+ struct gpio_chip **ptr;
+ int ret;
+
+ ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr),
+ GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ ret = gpiochip_add_data(chip, data);
+ if (ret < 0) {
+ devres_free(ptr);
+ return ret;
+ }
+
+ *ptr = chip;
+ devres_add(dev, ptr);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_gpiochip_add_data);
+
+/**
+ * devm_gpiochip_remove() - Resource manager of gpiochip_remove()
+ * @dev: device for which which resource was allocated
+ * @chip: the chip to remove
+ *
+ * A gpio_chip with any GPIOs still requested may not be removed.
+ */
+void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip)
+{
+ int ret;
+
+ ret = devres_release(dev, devm_gpio_chip_release,
+ devm_gpio_chip_match, chip);
+ if (!ret)
+ WARN_ON(ret);
+}
+EXPORT_SYMBOL_GPL(devm_gpiochip_remove);
+
/**
* gpiochip_find() - iterator for locating a specific gpio_chip
* @data: data to pass to match function
@@ -477,17 +797,21 @@ struct gpio_chip *gpiochip_find(void *data,
int (*match)(struct gpio_chip *chip,
void *data))
{
+ struct gpio_device *gdev;
struct gpio_chip *chip;
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
- list_for_each_entry(chip, &gpio_chips, list)
- if (match(chip, data))
+ list_for_each_entry(gdev, &gpio_devices, list)
+ if (match(gdev->chip, data))
break;
/* No match? */
- if (&chip->list == &gpio_chips)
+ if (&gdev->list == &gpio_devices)
chip = NULL;
+ else
+ chip = gdev->chip;
+
spin_unlock_irqrestore(&gpio_lock, flags);
return chip;
@@ -617,14 +941,14 @@ static int gpiochip_irq_reqres(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
- if (!try_module_get(chip->owner))
+ if (!try_module_get(chip->gpiodev->owner))
return -ENODEV;
if (gpiochip_lock_as_irq(chip, d->hwirq)) {
chip_err(chip,
"unable to lock HW IRQ %lu for IRQ\n",
d->hwirq);
- module_put(chip->owner);
+ module_put(chip->gpiodev->owner);
return -EINVAL;
}
return 0;
@@ -635,7 +959,7 @@ static void gpiochip_irq_relres(struct irq_data *d)
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
gpiochip_unlock_as_irq(chip, d->hwirq);
- module_put(chip->owner);
+ module_put(chip->gpiodev->owner);
}
static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset)
@@ -785,7 +1109,7 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {}
*/
int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset)
{
- return pinctrl_request_gpio(chip->base + offset);
+ return pinctrl_request_gpio(chip->gpiodev->base + offset);
}
EXPORT_SYMBOL_GPL(gpiochip_generic_request);
@@ -796,7 +1120,7 @@ EXPORT_SYMBOL_GPL(gpiochip_generic_request);
*/
void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset)
{
- pinctrl_free_gpio(chip->base + offset);
+ pinctrl_free_gpio(chip->gpiodev->base + offset);
}
EXPORT_SYMBOL_GPL(gpiochip_generic_free);
@@ -814,6 +1138,7 @@ int gpiochip_add_pingroup_range(struct gpio_chip *chip,
unsigned int gpio_offset, const char *pin_group)
{
struct gpio_pin_range *pin_range;
+ struct gpio_device *gdev = chip->gpiodev;
int ret;
pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
@@ -826,7 +1151,7 @@ int gpiochip_add_pingroup_range(struct gpio_chip *chip,
pin_range->range.id = gpio_offset;
pin_range->range.gc = chip;
pin_range->range.name = chip->label;
- pin_range->range.base = chip->base + gpio_offset;
+ pin_range->range.base = gdev->base + gpio_offset;
pin_range->pctldev = pctldev;
ret = pinctrl_get_group_pins(pctldev, pin_group,
@@ -843,7 +1168,7 @@ int gpiochip_add_pingroup_range(struct gpio_chip *chip,
gpio_offset, gpio_offset + pin_range->range.npins - 1,
pinctrl_dev_get_devname(pctldev), pin_group);
- list_add_tail(&pin_range->node, &chip->pin_ranges);
+ list_add_tail(&pin_range->node, &gdev->pin_ranges);
return 0;
}
@@ -863,6 +1188,7 @@ int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
unsigned int npins)
{
struct gpio_pin_range *pin_range;
+ struct gpio_device *gdev = chip->gpiodev;
int ret;
pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
@@ -875,7 +1201,7 @@ int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
pin_range->range.id = gpio_offset;
pin_range->range.gc = chip;
pin_range->range.name = chip->label;
- pin_range->range.base = chip->base + gpio_offset;
+ pin_range->range.base = gdev->base + gpio_offset;
pin_range->range.pin_base = pin_offset;
pin_range->range.npins = npins;
pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name,
@@ -891,7 +1217,7 @@ int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
pinctl_name,
pin_offset, pin_offset + npins - 1);
- list_add_tail(&pin_range->node, &chip->pin_ranges);
+ list_add_tail(&pin_range->node, &gdev->pin_ranges);
return 0;
}
@@ -904,8 +1230,9 @@ EXPORT_SYMBOL_GPL(gpiochip_add_pin_range);
void gpiochip_remove_pin_ranges(struct gpio_chip *chip)
{
struct gpio_pin_range *pin_range, *tmp;
+ struct gpio_device *gdev = chip->gpiodev;
- list_for_each_entry_safe(pin_range, tmp, &chip->pin_ranges, node) {
+ list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) {
list_del(&pin_range->node);
pinctrl_remove_gpio_range(pin_range->pctldev,
&pin_range->range);
@@ -922,7 +1249,7 @@ EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges);
*/
static int __gpiod_request(struct gpio_desc *desc, const char *label)
{
- struct gpio_chip *chip = desc->chip;
+ struct gpio_chip *chip = desc->gdev->chip;
int status;
unsigned long flags;
@@ -971,27 +1298,50 @@ done:
return status;
}
+/*
+ * This descriptor validation needs to be inserted verbatim into each
+ * function taking a descriptor, so we need to use a preprocessor
+ * macro to avoid endless duplication.
+ */
+#define VALIDATE_DESC(desc) do { \
+ if (!desc || !desc->gdev) { \
+ pr_warn("%s: invalid GPIO\n", __func__); \
+ return -EINVAL; \
+ } \
+ if ( !desc->gdev->chip ) { \
+ dev_warn(&desc->gdev->dev, \
+ "%s: backing chip is gone\n", __func__); \
+ return 0; \
+ } } while (0)
+
+#define VALIDATE_DESC_VOID(desc) do { \
+ if (!desc || !desc->gdev) { \
+ pr_warn("%s: invalid GPIO\n", __func__); \
+ return; \
+ } \
+ if (!desc->gdev->chip) { \
+ dev_warn(&desc->gdev->dev, \
+ "%s: backing chip is gone\n", __func__); \
+ return; \
+ } } while (0)
+
+
int gpiod_request(struct gpio_desc *desc, const char *label)
{
int status = -EPROBE_DEFER;
- struct gpio_chip *chip;
+ struct gpio_device *gdev;
- if (!desc) {
- pr_warn("%s: invalid GPIO\n", __func__);
- return -EINVAL;
- }
+ VALIDATE_DESC(desc);
+ gdev = desc->gdev;
- chip = desc->chip;
- if (!chip)
- goto done;
-
- if (try_module_get(chip->owner)) {
+ if (try_module_get(gdev->owner)) {
status = __gpiod_request(desc, label);
if (status < 0)
- module_put(chip->owner);
+ module_put(gdev->owner);
+ else
+ get_device(&gdev->dev);
}
-done:
if (status)
gpiod_dbg(desc, "%s: status %d\n", __func__, status);
@@ -1010,7 +1360,7 @@ static bool __gpiod_free(struct gpio_desc *desc)
spin_lock_irqsave(&gpio_lock, flags);
- chip = desc->chip;
+ chip = desc->gdev->chip;
if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) {
if (chip->free) {
spin_unlock_irqrestore(&gpio_lock, flags);
@@ -1033,10 +1383,12 @@ static bool __gpiod_free(struct gpio_desc *desc)
void gpiod_free(struct gpio_desc *desc)
{
- if (desc && __gpiod_free(desc))
- module_put(desc->chip->owner);
- else
+ if (desc && desc->gdev && __gpiod_free(desc)) {
+ module_put(desc->gdev->owner);
+ put_device(&desc->gdev->dev);
+ } else {
WARN_ON(extra_checks);
+ }
}
/**
@@ -1059,7 +1411,7 @@ const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset)
if (offset >= chip->ngpio)
return NULL;
- desc = &chip->desc[offset];
+ desc = &chip->gpiodev->descs[offset];
if (test_bit(FLAG_REQUESTED, &desc->flags) == 0)
return NULL;
@@ -1111,7 +1463,8 @@ void gpiochip_free_own_desc(struct gpio_desc *desc)
}
EXPORT_SYMBOL_GPL(gpiochip_free_own_desc);
-/* Drivers MUST set GPIO direction before making get/set calls. In
+/*
+ * Drivers MUST set GPIO direction before making get/set calls. In
* some cases this is done in early boot, before IRQs are enabled.
*
* As a rule these aren't called more than once (except for drivers
@@ -1134,12 +1487,9 @@ int gpiod_direction_input(struct gpio_desc *desc)
struct gpio_chip *chip;
int status = -EINVAL;
- if (!desc || !desc->chip) {
- pr_warn("%s: invalid GPIO\n", __func__);
- return -EINVAL;
- }
+ VALIDATE_DESC(desc);
+ chip = desc->gdev->chip;
- chip = desc->chip;
if (!chip->get || !chip->direction_input) {
gpiod_warn(desc,
"%s: missing get() or direction_input() operations\n",
@@ -1178,7 +1528,7 @@ static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value)
if (!value && test_bit(FLAG_OPEN_SOURCE, &desc->flags))
return gpiod_direction_input(desc);
- chip = desc->chip;
+ chip = desc->gdev->chip;
if (!chip->set || !chip->direction_output) {
gpiod_warn(desc,
"%s: missing set() or direction_output() operations\n",
@@ -1207,10 +1557,7 @@ static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value)
*/
int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
{
- if (!desc || !desc->chip) {
- pr_warn("%s: invalid GPIO\n", __func__);
- return -EINVAL;
- }
+ VALIDATE_DESC(desc);
return _gpiod_direction_output_raw(desc, value);
}
EXPORT_SYMBOL_GPL(gpiod_direction_output_raw);
@@ -1229,10 +1576,7 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output_raw);
*/
int gpiod_direction_output(struct gpio_desc *desc, int value)
{
- if (!desc || !desc->chip) {
- pr_warn("%s: invalid GPIO\n", __func__);
- return -EINVAL;
- }
+ VALIDATE_DESC(desc);
if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
return _gpiod_direction_output_raw(desc, value);
@@ -1251,12 +1595,8 @@ int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
{
struct gpio_chip *chip;
- if (!desc || !desc->chip) {
- pr_warn("%s: invalid GPIO\n", __func__);
- return -EINVAL;
- }
-
- chip = desc->chip;
+ VALIDATE_DESC(desc);
+ chip = desc->gdev->chip;
if (!chip->set || !chip->set_debounce) {
gpiod_dbg(desc,
"%s: missing set() or set_debounce() operations\n",
@@ -1276,6 +1616,7 @@ EXPORT_SYMBOL_GPL(gpiod_set_debounce);
*/
int gpiod_is_active_low(const struct gpio_desc *desc)
{
+ VALIDATE_DESC(desc);
return test_bit(FLAG_ACTIVE_LOW, &desc->flags);
}
EXPORT_SYMBOL_GPL(gpiod_is_active_low);
@@ -1308,7 +1649,7 @@ static int _gpiod_get_raw_value(const struct gpio_desc *desc)
int offset;
int value;
- chip = desc->chip;
+ chip = desc->gdev->chip;
offset = gpio_chip_hwgpio(desc);
value = chip->get ? chip->get(chip, offset) : -EIO;
value = value < 0 ? value : !!value;
@@ -1328,10 +1669,9 @@ static int _gpiod_get_raw_value(const struct gpio_desc *desc)
*/
int gpiod_get_raw_value(const struct gpio_desc *desc)
{
- if (!desc)
- return 0;
+ VALIDATE_DESC(desc);
/* Should be using gpio_get_value_cansleep() */
- WARN_ON(desc->chip->can_sleep);
+ WARN_ON(desc->gdev->chip->can_sleep);
return _gpiod_get_raw_value(desc);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_value);
@@ -1349,10 +1689,10 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_value);
int gpiod_get_value(const struct gpio_desc *desc)
{
int value;
- if (!desc)
- return 0;
+
+ VALIDATE_DESC(desc);
/* Should be using gpio_get_value_cansleep() */
- WARN_ON(desc->chip->can_sleep);
+ WARN_ON(desc->gdev->chip->can_sleep);
value = _gpiod_get_raw_value(desc);
if (value < 0)
@@ -1373,7 +1713,7 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value)
{
int err = 0;
- struct gpio_chip *chip = desc->chip;
+ struct gpio_chip *chip = desc->gdev->chip;
int offset = gpio_chip_hwgpio(desc);
if (value) {
@@ -1400,7 +1740,7 @@ static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value)
static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value)
{
int err = 0;
- struct gpio_chip *chip = desc->chip;
+ struct gpio_chip *chip = desc->gdev->chip;
int offset = gpio_chip_hwgpio(desc);
if (value) {
@@ -1423,7 +1763,7 @@ static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value)
{
struct gpio_chip *chip;
- chip = desc->chip;
+ chip = desc->gdev->chip;
trace_gpio_value(desc_to_gpio(desc), 0, value);
if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
_gpio_set_open_drain_value(desc, value);
@@ -1471,7 +1811,7 @@ static void gpiod_set_array_value_priv(bool raw, bool can_sleep,
int i = 0;
while (i < array_size) {
- struct gpio_chip *chip = desc_array[i]->chip;
+ struct gpio_chip *chip = desc_array[i]->gdev->chip;
unsigned long mask[BITS_TO_LONGS(chip->ngpio)];
unsigned long bits[BITS_TO_LONGS(chip->ngpio)];
int count = 0;
@@ -1505,7 +1845,8 @@ static void gpiod_set_array_value_priv(bool raw, bool can_sleep,
count++;
}
i++;
- } while ((i < array_size) && (desc_array[i]->chip == chip));
+ } while ((i < array_size) &&
+ (desc_array[i]->gdev->chip == chip));
/* push collected bits to outputs */
if (count != 0)
gpio_chip_set_multiple(chip, mask, bits);
@@ -1525,10 +1866,9 @@ static void gpiod_set_array_value_priv(bool raw, bool can_sleep,
*/
void gpiod_set_raw_value(struct gpio_desc *desc, int value)
{
- if (!desc)
- return;
- /* Should be using gpio_set_value_cansleep() */
- WARN_ON(desc->chip->can_sleep);
+ VALIDATE_DESC_VOID(desc);
+ /* Should be using gpiod_set_value_cansleep() */
+ WARN_ON(desc->gdev->chip->can_sleep);
_gpiod_set_raw_value(desc, value);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
@@ -1546,10 +1886,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
*/
void gpiod_set_value(struct gpio_desc *desc, int value)
{
- if (!desc)
- return;
- /* Should be using gpio_set_value_cansleep() */
- WARN_ON(desc->chip->can_sleep);
+ VALIDATE_DESC_VOID(desc);
+ /* Should be using gpiod_set_value_cansleep() */
+ WARN_ON(desc->gdev->chip->can_sleep);
if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
_gpiod_set_raw_value(desc, value);
@@ -1607,9 +1946,8 @@ EXPORT_SYMBOL_GPL(gpiod_set_array_value);
*/
int gpiod_cansleep(const struct gpio_desc *desc)
{
- if (!desc)
- return 0;
- return desc->chip->can_sleep;
+ VALIDATE_DESC(desc);
+ return desc->gdev->chip->can_sleep;
}
EXPORT_SYMBOL_GPL(gpiod_cansleep);
@@ -1625,9 +1963,8 @@ int gpiod_to_irq(const struct gpio_desc *desc)
struct gpio_chip *chip;
int offset;
- if (!desc)
- return -EINVAL;
- chip = desc->chip;
+ VALIDATE_DESC(desc);
+ chip = desc->gdev->chip;
offset = gpio_chip_hwgpio(desc);
return chip->to_irq ? chip->to_irq(chip, offset) : -ENXIO;
}
@@ -1646,14 +1983,14 @@ int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
if (offset >= chip->ngpio)
return -EINVAL;
- if (test_bit(FLAG_IS_OUT, &chip->desc[offset].flags)) {
+ if (test_bit(FLAG_IS_OUT, &chip->gpiodev->descs[offset].flags)) {
chip_err(chip,
"%s: tried to flag a GPIO set as output for IRQ\n",
__func__);
return -EIO;
}
- set_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags);
+ set_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags);
return 0;
}
EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq);
@@ -1671,10 +2008,37 @@ void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
if (offset >= chip->ngpio)
return;
- clear_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags);
+ clear_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags);
}
EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq);
+bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset)
+{
+ if (offset >= chip->ngpio)
+ return false;
+
+ return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags);
+}
+EXPORT_SYMBOL_GPL(gpiochip_line_is_irq);
+
+bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset)
+{
+ if (offset >= chip->ngpio)
+ return false;
+
+ return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags);
+}
+EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain);
+
+bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset)
+{
+ if (offset >= chip->ngpio)
+ return false;
+
+ return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags);
+}
+EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source);
+
/**
* gpiod_get_raw_value_cansleep() - return a gpio's raw value
* @desc: gpio whose value will be returned
@@ -1687,8 +2051,7 @@ EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
{
might_sleep_if(extra_checks);
- if (!desc)
- return 0;
+ VALIDATE_DESC(desc);
return _gpiod_get_raw_value(desc);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep);
@@ -1707,9 +2070,7 @@ int gpiod_get_value_cansleep(const struct gpio_desc *desc)
int value;
might_sleep_if(extra_checks);
- if (!desc)
- return 0;
-
+ VALIDATE_DESC(desc);
value = _gpiod_get_raw_value(desc);
if (value < 0)
return value;
@@ -1734,8 +2095,7 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value)
{
might_sleep_if(extra_checks);
- if (!desc)
- return;
+ VALIDATE_DESC_VOID(desc);
_gpiod_set_raw_value(desc, value);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep);
@@ -1753,9 +2113,7 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
{
might_sleep_if(extra_checks);
- if (!desc)
- return;
-
+ VALIDATE_DESC_VOID(desc);
if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
_gpiod_set_raw_value(desc, value);
@@ -2358,8 +2716,8 @@ static void gpiochip_free_hogs(struct gpio_chip *chip)
int id;
for (id = 0; id < chip->ngpio; id++) {
- if (test_bit(FLAG_IS_HOGGED, &chip->desc[id].flags))
- gpiochip_free_own_desc(&chip->desc[id]);
+ if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags))
+ gpiochip_free_own_desc(&chip->gpiodev->descs[id]);
}
}
@@ -2456,17 +2814,38 @@ void gpiod_put_array(struct gpio_descs *descs)
}
EXPORT_SYMBOL_GPL(gpiod_put_array);
+static int __init gpiolib_dev_init(void)
+{
+ int ret;
+
+ /* Register GPIO sysfs bus */
+ ret = bus_register(&gpio_bus_type);
+ if (ret < 0) {
+ pr_err("gpiolib: could not register GPIO bus type\n");
+ return ret;
+ }
+
+ ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip");
+ if (ret < 0) {
+ pr_err("gpiolib: failed to allocate char dev region\n");
+ bus_unregister(&gpio_bus_type);
+ }
+ return ret;
+}
+core_initcall(gpiolib_dev_init);
+
#ifdef CONFIG_DEBUG_FS
-static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev)
{
unsigned i;
- unsigned gpio = chip->base;
- struct gpio_desc *gdesc = &chip->desc[0];
+ struct gpio_chip *chip = gdev->chip;
+ unsigned gpio = gdev->base;
+ struct gpio_desc *gdesc = &gdev->descs[0];
int is_out;
int is_irq;
- for (i = 0; i < chip->ngpio; i++, gpio++, gdesc++) {
+ for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) {
if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) {
if (gdesc->name) {
seq_printf(s, " gpio-%-3d (%-20.20s)\n",
@@ -2492,16 +2871,16 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos)
{
unsigned long flags;
- struct gpio_chip *chip = NULL;
+ struct gpio_device *gdev = NULL;
loff_t index = *pos;
s->private = "";
spin_lock_irqsave(&gpio_lock, flags);
- list_for_each_entry(chip, &gpio_chips, list)
+ list_for_each_entry(gdev, &gpio_devices, list)
if (index-- == 0) {
spin_unlock_irqrestore(&gpio_lock, flags);
- return chip;
+ return gdev;
}
spin_unlock_irqrestore(&gpio_lock, flags);
@@ -2511,14 +2890,14 @@ static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos)
static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
unsigned long flags;
- struct gpio_chip *chip = v;
+ struct gpio_device *gdev = v;
void *ret = NULL;
spin_lock_irqsave(&gpio_lock, flags);
- if (list_is_last(&chip->list, &gpio_chips))
+ if (list_is_last(&gdev->list, &gpio_devices))
ret = NULL;
else
- ret = list_entry(chip->list.next, struct gpio_chip, list);
+ ret = list_entry(gdev->list.next, struct gpio_device, list);
spin_unlock_irqrestore(&gpio_lock, flags);
s->private = "\n";
@@ -2533,15 +2912,24 @@ static void gpiolib_seq_stop(struct seq_file *s, void *v)
static int gpiolib_seq_show(struct seq_file *s, void *v)
{
- struct gpio_chip *chip = v;
- struct device *dev;
+ struct gpio_device *gdev = v;
+ struct gpio_chip *chip = gdev->chip;
+ struct device *parent;
+
+ if (!chip) {
+ seq_printf(s, "%s%s: (dangling chip)", (char *)s->private,
+ dev_name(&gdev->dev));
+ return 0;
+ }
- seq_printf(s, "%sGPIOs %d-%d", (char *)s->private,
- chip->base, chip->base + chip->ngpio - 1);
- dev = chip->parent;
- if (dev)
- seq_printf(s, ", %s/%s", dev->bus ? dev->bus->name : "no-bus",
- dev_name(dev));
+ seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private,
+ dev_name(&gdev->dev),
+ gdev->base, gdev->base + gdev->ngpio - 1);
+ parent = chip->parent;
+ if (parent)
+ seq_printf(s, ", parent: %s/%s",
+ parent->bus ? parent->bus->name : "no-bus",
+ dev_name(parent));
if (chip->label)
seq_printf(s, ", %s", chip->label);
if (chip->can_sleep)
@@ -2551,7 +2939,7 @@ static int gpiolib_seq_show(struct seq_file *s, void *v)
if (chip->dbg_show)
chip->dbg_show(s, chip);
else
- gpiolib_dbg_show(s, chip);
+ gpiolib_dbg_show(s, gdev);
return 0;
}