diff options
Diffstat (limited to 'drivers/gpio/gpiolib.c')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 883 |
1 files changed, 660 insertions, 223 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 5c1ba879f..b747c76fd 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. @@ -50,12 +63,12 @@ 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); +static bool gpiolib_initialized; static inline void desc_set_label(struct gpio_desc *d, const char *label) { @@ -67,15 +80,16 @@ 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 +108,12 @@ 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 +123,7 @@ 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 +134,25 @@ 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 +205,45 @@ 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 +251,23 @@ 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 +285,7 @@ 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) @@ -290,19 +297,208 @@ 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->label); + kfree(gdev->descs); + kfree(gdev); +} + +static int gpiochip_setup_dev(struct gpio_device *gdev) +{ + int status; + + 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(gdev->chip, "failed to add char device %d:%d\n", + MAJOR(gpio_devt), gdev->id); + else + chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", + MAJOR(gpio_devt), gdev->id); + status = device_add(&gdev->dev); + if (status) + goto err_remove_chardev; + + status = gpiochip_sysfs_register(gdev); + if (status) + goto err_remove_device; + + /* 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), gdev->chip->label ? : "generic"); + + return 0; + +err_remove_device: + device_del(&gdev->dev); +err_remove_chardev: + cdev_del(&gdev->chrdev); + return status; +} + +static void gpiochip_setup_devs(void) +{ + struct gpio_device *gdev; + int err; + + list_for_each_entry(gdev, &gpio_devices, list) { + err = gpiochip_setup_dev(gdev); + if (err) + pr_err("%s: Failed to initialize gpio device (%d)\n", + dev_name(&gdev->dev), err); + } +} + +/** * gpiochip_add_data() - register a gpio_chip * @chip: the chip to register, with chip->base initialized * Context: potentially before irqs will work @@ -316,6 +512,9 @@ static int gpiochip_set_desc_names(struct gpio_chip *gc) * the gpio framework's arch_initcall(). Otherwise sysfs initialization * for GPIOs will fail rudely. * + * gpiochip_add_data() must only be called after gpiolib initialization, + * ie after core_initcall(). + * * If chip->base is negative, this requests dynamic assignment of * a range of valid GPIOs. */ @@ -323,43 +522,106 @@ 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 = kcalloc(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_descs; + } + + if (chip->label) + gdev->label = kstrdup(chip->label, GFP_KERNEL); + else + gdev->label = kstrdup("unknown", GFP_KERNEL); + if (!gdev->label) { + status = -ENOMEM; + goto err_free_descs; } + 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_label; } + /* + * 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_label; } - 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 +632,12 @@ 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; @@ -391,14 +648,19 @@ int gpiochip_add_data(struct gpio_chip *chip, void *data) acpi_gpiochip_add(chip); - status = gpiochip_sysfs_register(chip); - if (status) - goto err_remove_chip; - - pr_debug("%s: registered GPIOs %d to %d on device: %s\n", __func__, - chip->base, chip->base + chip->ngpio - 1, - chip->label ? : "generic"); - + /* + * 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. + * We can do this only if gpiolib has been initialized. + * Otherwise, defer until later. + */ + if (gpiolib_initialized) { + status = gpiochip_setup_dev(gdev); + if (status) + goto err_remove_chip; + } return 0; err_remove_chip: @@ -407,21 +669,33 @@ err_remove_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_label: + kfree(gdev->label); err_free_descs: - kfree(descs); - + kfree(gdev->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 +703,123 @@ 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 +835,21 @@ 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 +979,14 @@ 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 +997,7 @@ 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 +1147,7 @@ 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 +1158,7 @@ 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 +1176,7 @@ 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 +1189,7 @@ 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 +1206,7 @@ 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 +1226,7 @@ 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 +1239,7 @@ 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 +1255,7 @@ 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 +1268,9 @@ 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 +1287,7 @@ 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 +1336,50 @@ 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; - - if (!desc) { - pr_warn("%s: invalid GPIO\n", __func__); - return -EINVAL; - } + struct gpio_device *gdev; - chip = desc->chip; - if (!chip) - goto done; + VALIDATE_DESC(desc); + gdev = desc->gdev; - 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 +1398,7 @@ 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 +1421,12 @@ 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 +1449,7 @@ 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 +1501,8 @@ 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 +1525,9 @@ 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 +1566,7 @@ 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 +1595,7 @@ 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 +1614,7 @@ 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 +1633,8 @@ 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 +1654,7 @@ 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 +1687,7 @@ 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 +1707,9 @@ 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 +1727,10 @@ 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 +1751,7 @@ 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 +1778,7 @@ 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 +1801,7 @@ 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 +1849,7 @@ 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 +1883,8 @@ 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 +1904,9 @@ 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 +1924,9 @@ 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 +1984,8 @@ 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 +2001,8 @@ 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 +2021,14 @@ 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 +2046,37 @@ 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 +2089,7 @@ 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 +2108,7 @@ 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 +2133,7 @@ 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 +2151,7 @@ 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); @@ -1873,9 +2269,11 @@ static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, return desc; } -static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id, +static struct gpio_desc *acpi_find_gpio(struct device *dev, + const char *con_id, unsigned int idx, - enum gpio_lookup_flags *flags) + enum gpiod_flags flags, + enum gpio_lookup_flags *lookupflags) { struct acpi_device *adev = ACPI_COMPANION(dev); struct acpi_gpio_info info; @@ -1906,10 +2304,16 @@ static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id, desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); if (IS_ERR(desc)) return desc; + + if ((flags == GPIOD_OUT_LOW || flags == GPIOD_OUT_HIGH) && + info.gpioint) { + dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n"); + return ERR_PTR(-ENOENT); + } } if (info.polarity == GPIO_ACTIVE_LOW) - *flags |= GPIO_ACTIVE_LOW; + *lookupflags |= GPIO_ACTIVE_LOW; return desc; } @@ -2172,7 +2576,7 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev, desc = of_find_gpio(dev, con_id, idx, &lookupflags); } else if (ACPI_COMPANION(dev)) { dev_dbg(dev, "using ACPI for GPIO lookup\n"); - desc = acpi_find_gpio(dev, con_id, idx, &lookupflags); + desc = acpi_find_gpio(dev, con_id, idx, flags, &lookupflags); } } @@ -2358,8 +2762,8 @@ 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 +2860,41 @@ 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); + } else { + gpiolib_initialized = true; + gpiochip_setup_devs(); + } + 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 +2920,16 @@ 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 +2939,14 @@ 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 +2961,24 @@ 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 +2988,7 @@ 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; } |