diff options
Diffstat (limited to 'drivers/gpio/gpiolib.c')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 1299 |
1 files changed, 735 insertions, 564 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 86bde1e30a60..40f2d7f69be2 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -81,14 +81,14 @@ LIST_HEAD(gpio_devices); static DEFINE_MUTEX(gpio_machine_hogs_mutex); static LIST_HEAD(gpio_machine_hogs); -static void gpiochip_free_hogs(struct gpio_chip *chip); -static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, +static void gpiochip_free_hogs(struct gpio_chip *gc); +static int gpiochip_add_irqchip(struct gpio_chip *gc, struct lock_class_key *lock_key, struct lock_class_key *request_key); -static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); -static int gpiochip_irqchip_init_hw(struct gpio_chip *gpiochip); -static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip); -static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip); +static void gpiochip_irqchip_remove(struct gpio_chip *gc); +static int gpiochip_irqchip_init_hw(struct gpio_chip *gc); +static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gc); +static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gc); static bool gpiolib_initialized; @@ -132,17 +132,17 @@ EXPORT_SYMBOL_GPL(gpio_to_desc); /** * gpiochip_get_desc - get the GPIO descriptor corresponding to the given * hardware number for this chip - * @chip: GPIO chip + * @gc: GPIO chip * @hwnum: hardware number of the GPIO for this chip * * Returns: - * A pointer to the GPIO descriptor or %ERR_PTR(-EINVAL) if no GPIO exists + * A pointer to the GPIO descriptor or ``ERR_PTR(-EINVAL)`` if no GPIO exists * in the given chip for the specified hardware number. */ -struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, +struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum) { - struct gpio_device *gdev = chip->gpiodev; + struct gpio_device *gdev = gc->gpiodev; if (hwnum >= gdev->ngpio) return ERR_PTR(-EINVAL); @@ -214,11 +214,11 @@ static int gpiochip_find_base(int ngpio) */ int gpiod_get_direction(struct gpio_desc *desc) { - struct gpio_chip *chip; + struct gpio_chip *gc; unsigned offset; int ret; - chip = gpiod_to_chip(desc); + gc = gpiod_to_chip(desc); offset = gpio_chip_hwgpio(desc); /* @@ -229,10 +229,10 @@ int gpiod_get_direction(struct gpio_desc *desc) test_bit(FLAG_IS_OUT, &desc->flags)) return 0; - if (!chip->get_direction) + if (!gc->get_direction) return -ENOTSUPP; - ret = chip->get_direction(chip, offset); + ret = gc->get_direction(gc, offset); if (ret < 0) return ret; @@ -302,6 +302,9 @@ static struct gpio_desc *gpio_name_to_desc(const char * const name) struct gpio_device *gdev; unsigned long flags; + if (!name) + return NULL; + spin_lock_irqsave(&gpio_lock, flags); list_for_each_entry(gdev, &gpio_devices, list) { @@ -310,7 +313,7 @@ static struct gpio_desc *gpio_name_to_desc(const char * const name) for (i = 0; i != gdev->ngpio; ++i) { struct gpio_desc *desc = &gdev->descs[i]; - if (!desc->name || !name) + if (!desc->name) continue; if (!strcmp(desc->name, name)) { @@ -357,16 +360,16 @@ static int gpiochip_set_desc_names(struct gpio_chip *gc) return 0; } -static unsigned long *gpiochip_allocate_mask(struct gpio_chip *chip) +static unsigned long *gpiochip_allocate_mask(struct gpio_chip *gc) { unsigned long *p; - p = bitmap_alloc(chip->ngpio, GFP_KERNEL); + p = bitmap_alloc(gc->ngpio, GFP_KERNEL); if (!p) return NULL; /* Assume by default all GPIOs are valid */ - bitmap_fill(p, chip->ngpio); + bitmap_fill(p, gc->ngpio); return p; } @@ -393,10 +396,10 @@ static int gpiochip_init_valid_mask(struct gpio_chip *gc) return 0; } -static void gpiochip_free_valid_mask(struct gpio_chip *gpiochip) +static void gpiochip_free_valid_mask(struct gpio_chip *gc) { - bitmap_free(gpiochip->valid_mask); - gpiochip->valid_mask = NULL; + bitmap_free(gc->valid_mask); + gc->valid_mask = NULL; } static int gpiochip_add_pin_ranges(struct gpio_chip *gc) @@ -407,13 +410,13 @@ static int gpiochip_add_pin_ranges(struct gpio_chip *gc) return 0; } -bool gpiochip_line_is_valid(const struct gpio_chip *gpiochip, +bool gpiochip_line_is_valid(const struct gpio_chip *gc, unsigned int offset) { /* No mask means all valid */ - if (likely(!gpiochip->valid_mask)) + if (likely(!gc->valid_mask)) return true; - return test_bit(offset, gpiochip->valid_mask); + return test_bit(offset, gc->valid_mask); } EXPORT_SYMBOL_GPL(gpiochip_line_is_valid); @@ -547,6 +550,9 @@ static long linehandle_set_config(struct linehandle_state *lh, if (ret) return ret; } + + atomic_notifier_call_chain(&desc->gdev->notifier, + GPIOLINE_CHANGED_CONFIG, desc); } return 0; } @@ -788,8 +794,6 @@ out_free_lh: * @irq: the interrupt that trigger in response to events on this GPIO * @wait: wait queue that handles blocking reads of events * @events: KFIFO for the GPIO events - * @read_lock: mutex lock to protect reads from colliding with adding - * new events to the FIFO * @timestamp: cache for the timestamp storing it between hardirq * and IRQ thread, used to bring the timestamp close to the actual * event @@ -802,7 +806,6 @@ struct lineevent_state { int irq; wait_queue_head_t wait; DECLARE_KFIFO(events, struct gpioevent_data, 16); - struct mutex read_lock; u64 timestamp; }; @@ -818,7 +821,7 @@ static __poll_t lineevent_poll(struct file *filep, poll_wait(filep, &le->wait, wait); - if (!kfifo_is_empty(&le->events)) + if (!kfifo_is_empty_spinlocked_noirqsave(&le->events, &le->wait.lock)) events = EPOLLIN | EPOLLRDNORM; return events; @@ -831,43 +834,52 @@ static ssize_t lineevent_read(struct file *filep, loff_t *f_ps) { struct lineevent_state *le = filep->private_data; - unsigned int copied; + struct gpioevent_data ge; + ssize_t bytes_read = 0; int ret; - if (count < sizeof(struct gpioevent_data)) + if (count < sizeof(ge)) return -EINVAL; do { + spin_lock(&le->wait.lock); if (kfifo_is_empty(&le->events)) { - if (filep->f_flags & O_NONBLOCK) + if (bytes_read) { + spin_unlock(&le->wait.lock); + return bytes_read; + } + + if (filep->f_flags & O_NONBLOCK) { + spin_unlock(&le->wait.lock); return -EAGAIN; + } - ret = wait_event_interruptible(le->wait, + ret = wait_event_interruptible_locked(le->wait, !kfifo_is_empty(&le->events)); - if (ret) + if (ret) { + spin_unlock(&le->wait.lock); return ret; + } } - if (mutex_lock_interruptible(&le->read_lock)) - return -ERESTARTSYS; - ret = kfifo_to_user(&le->events, buf, count, &copied); - mutex_unlock(&le->read_lock); - - if (ret) - return ret; - - /* - * If we couldn't read anything from the fifo (a different - * thread might have been faster) we either return -EAGAIN if - * the file descriptor is non-blocking, otherwise we go back to - * sleep and wait for more data to arrive. - */ - if (copied == 0 && (filep->f_flags & O_NONBLOCK)) - return -EAGAIN; + ret = kfifo_out(&le->events, &ge, 1); + spin_unlock(&le->wait.lock); + if (ret != 1) { + /* + * This should never happen - we were holding the lock + * from the moment we learned the fifo is no longer + * empty until now. + */ + ret = -EIO; + break; + } - } while (copied == 0); + if (copy_to_user(buf + bytes_read, &ge, sizeof(ge))) + return -EFAULT; + bytes_read += sizeof(ge); + } while (count >= bytes_read + sizeof(ge)); - return copied; + return bytes_read; } static int lineevent_release(struct inode *inode, struct file *filep) @@ -946,7 +958,7 @@ static irqreturn_t lineevent_irq_thread(int irq, void *p) * we didn't get the timestamp from lineevent_irq_handler(). */ if (!le->timestamp) - ge.timestamp = ktime_get_real_ns(); + ge.timestamp = ktime_get_ns(); else ge.timestamp = le->timestamp; @@ -969,9 +981,12 @@ static irqreturn_t lineevent_irq_thread(int irq, void *p) return IRQ_NONE; } - ret = kfifo_put(&le->events, ge); + ret = kfifo_in_spinlocked_noirqsave(&le->events, &ge, + 1, &le->wait.lock); if (ret) wake_up_poll(&le->wait, EPOLLIN); + else + pr_debug_ratelimited("event FIFO is full - event dropped\n"); return IRQ_HANDLED; } @@ -984,7 +999,7 @@ static irqreturn_t lineevent_irq_handler(int irq, void *p) * Just store the timestamp in hardirq context so we get it as * close in time as possible to the actual event. */ - le->timestamp = ktime_get_real_ns(); + le->timestamp = ktime_get_ns(); return IRQ_WAKE_THREAD; } @@ -1084,7 +1099,6 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) INIT_KFIFO(le->events); init_waitqueue_head(&le->wait); - mutex_init(&le->read_lock); /* Request a thread to read the events */ ret = request_threaded_irq(le->irq, @@ -1140,17 +1154,82 @@ out_free_le: return ret; } +static void gpio_desc_to_lineinfo(struct gpio_desc *desc, + struct gpioline_info *info) +{ + struct gpio_chip *gc = desc->gdev->chip; + unsigned long flags; + + spin_lock_irqsave(&gpio_lock, flags); + + if (desc->name) { + strncpy(info->name, desc->name, sizeof(info->name)); + info->name[sizeof(info->name) - 1] = '\0'; + } else { + info->name[0] = '\0'; + } + + if (desc->label) { + strncpy(info->consumer, desc->label, sizeof(info->consumer)); + info->consumer[sizeof(info->consumer) - 1] = '\0'; + } else { + info->consumer[0] = '\0'; + } + + /* + * Userspace only need to know that the kernel is using this GPIO so + * it can't use it. + */ + info->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) || + !pinctrl_gpio_can_use_line(gc->base + info->line_offset)) + info->flags |= GPIOLINE_FLAG_KERNEL; + if (test_bit(FLAG_IS_OUT, &desc->flags)) + info->flags |= GPIOLINE_FLAG_IS_OUT; + if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) + info->flags |= GPIOLINE_FLAG_ACTIVE_LOW; + if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) + info->flags |= (GPIOLINE_FLAG_OPEN_DRAIN | + GPIOLINE_FLAG_IS_OUT); + if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) + info->flags |= (GPIOLINE_FLAG_OPEN_SOURCE | + GPIOLINE_FLAG_IS_OUT); + if (test_bit(FLAG_BIAS_DISABLE, &desc->flags)) + info->flags |= GPIOLINE_FLAG_BIAS_DISABLE; + if (test_bit(FLAG_PULL_DOWN, &desc->flags)) + info->flags |= GPIOLINE_FLAG_BIAS_PULL_DOWN; + if (test_bit(FLAG_PULL_UP, &desc->flags)) + info->flags |= GPIOLINE_FLAG_BIAS_PULL_UP; + + spin_unlock_irqrestore(&gpio_lock, flags); +} + +struct gpio_chardev_data { + struct gpio_device *gdev; + wait_queue_head_t wait; + DECLARE_KFIFO(events, struct gpioline_info_changed, 32); + struct notifier_block lineinfo_changed_nb; + unsigned long *watched_lines; +}; + /* * 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; + struct gpio_chardev_data *priv = filp->private_data; + struct gpio_device *gdev = priv->gdev; + struct gpio_chip *gc = gdev->chip; void __user *ip = (void __user *)arg; + struct gpio_desc *desc; + __u32 offset; /* We fail any subsequent ioctl():s when the chip is gone */ - if (!chip) + if (!gc) return -ENODEV; /* Fill in the struct and pass to userspace */ @@ -1169,68 +1248,40 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) return -EFAULT; return 0; - } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { + } else if (cmd == GPIO_GET_LINEINFO_IOCTL || + cmd == GPIO_GET_LINEINFO_WATCH_IOCTL) { struct gpioline_info lineinfo; - struct gpio_desc *desc; if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) return -EFAULT; - desc = gpiochip_get_desc(chip, lineinfo.line_offset); + desc = gpiochip_get_desc(gc, lineinfo.line_offset); if (IS_ERR(desc)) return PTR_ERR(desc); - 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) || - !pinctrl_gpio_can_use_line(chip->base + lineinfo.line_offset)) - 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 | - GPIOLINE_FLAG_IS_OUT); - if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) - lineinfo.flags |= (GPIOLINE_FLAG_OPEN_SOURCE | - GPIOLINE_FLAG_IS_OUT); - if (test_bit(FLAG_BIAS_DISABLE, &desc->flags)) - lineinfo.flags |= GPIOLINE_FLAG_BIAS_DISABLE; - if (test_bit(FLAG_PULL_DOWN, &desc->flags)) - lineinfo.flags |= GPIOLINE_FLAG_BIAS_PULL_DOWN; - if (test_bit(FLAG_PULL_UP, &desc->flags)) - lineinfo.flags |= GPIOLINE_FLAG_BIAS_PULL_UP; + gpio_desc_to_lineinfo(desc, &lineinfo); if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) return -EFAULT; + + if (cmd == GPIO_GET_LINEINFO_WATCH_IOCTL) + set_bit(gpio_chip_hwgpio(desc), priv->watched_lines); + return 0; } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { return linehandle_create(gdev, ip); } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { return lineevent_create(gdev, ip); + } else if (cmd == GPIO_GET_LINEINFO_UNWATCH_IOCTL) { + if (copy_from_user(&offset, ip, sizeof(offset))) + return -EFAULT; + + desc = gpiochip_get_desc(gc, offset); + if (IS_ERR(desc)) + return PTR_ERR(desc); + + clear_bit(gpio_chip_hwgpio(desc), priv->watched_lines); + return 0; } return -EINVAL; } @@ -1243,6 +1294,101 @@ static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, } #endif +static struct gpio_chardev_data * +to_gpio_chardev_data(struct notifier_block *nb) +{ + return container_of(nb, struct gpio_chardev_data, lineinfo_changed_nb); +} + +static int lineinfo_changed_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct gpio_chardev_data *priv = to_gpio_chardev_data(nb); + struct gpioline_info_changed chg; + struct gpio_desc *desc = data; + int ret; + + if (!test_bit(gpio_chip_hwgpio(desc), priv->watched_lines)) + return NOTIFY_DONE; + + memset(&chg, 0, sizeof(chg)); + chg.info.line_offset = gpio_chip_hwgpio(desc); + chg.event_type = action; + chg.timestamp = ktime_get_ns(); + gpio_desc_to_lineinfo(desc, &chg.info); + + ret = kfifo_in_spinlocked(&priv->events, &chg, 1, &priv->wait.lock); + if (ret) + wake_up_poll(&priv->wait, EPOLLIN); + else + pr_debug_ratelimited("lineinfo event FIFO is full - event dropped\n"); + + return NOTIFY_OK; +} + +static __poll_t lineinfo_watch_poll(struct file *filep, + struct poll_table_struct *pollt) +{ + struct gpio_chardev_data *priv = filep->private_data; + __poll_t events = 0; + + poll_wait(filep, &priv->wait, pollt); + + if (!kfifo_is_empty_spinlocked_noirqsave(&priv->events, + &priv->wait.lock)) + events = EPOLLIN | EPOLLRDNORM; + + return events; +} + +static ssize_t lineinfo_watch_read(struct file *filep, char __user *buf, + size_t count, loff_t *off) +{ + struct gpio_chardev_data *priv = filep->private_data; + struct gpioline_info_changed event; + ssize_t bytes_read = 0; + int ret; + + if (count < sizeof(event)) + return -EINVAL; + + do { + spin_lock(&priv->wait.lock); + if (kfifo_is_empty(&priv->events)) { + if (bytes_read) { + spin_unlock(&priv->wait.lock); + return bytes_read; + } + + if (filep->f_flags & O_NONBLOCK) { + spin_unlock(&priv->wait.lock); + return -EAGAIN; + } + + ret = wait_event_interruptible_locked(priv->wait, + !kfifo_is_empty(&priv->events)); + if (ret) { + spin_unlock(&priv->wait.lock); + return ret; + } + } + + ret = kfifo_out(&priv->events, &event, 1); + spin_unlock(&priv->wait.lock); + if (ret != 1) { + ret = -EIO; + break; + /* We should never get here. See lineevent_read(). */ + } + + if (copy_to_user(buf + bytes_read, &event, sizeof(event))) + return -EFAULT; + bytes_read += sizeof(event); + } while (count >= bytes_read + sizeof(event)); + + return bytes_read; +} + /** * gpio_chrdev_open() - open the chardev for ioctl operations * @inode: inode for this chardev @@ -1253,14 +1399,48 @@ static int gpio_chrdev_open(struct inode *inode, struct file *filp) { struct gpio_device *gdev = container_of(inode->i_cdev, struct gpio_device, chrdev); + struct gpio_chardev_data *priv; + int ret = -ENOMEM; /* Fail on open if the backing gpiochip is gone */ if (!gdev->chip) return -ENODEV; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->watched_lines = bitmap_zalloc(gdev->chip->ngpio, GFP_KERNEL); + if (!priv->watched_lines) + goto out_free_priv; + + init_waitqueue_head(&priv->wait); + INIT_KFIFO(priv->events); + priv->gdev = gdev; + + priv->lineinfo_changed_nb.notifier_call = lineinfo_changed_notify; + ret = atomic_notifier_chain_register(&gdev->notifier, + &priv->lineinfo_changed_nb); + if (ret) + goto out_free_bitmap; + get_device(&gdev->dev); - filp->private_data = gdev; + filp->private_data = priv; - return nonseekable_open(inode, filp); + ret = nonseekable_open(inode, filp); + if (ret) + goto out_unregister_notifier; + + return ret; + +out_unregister_notifier: + atomic_notifier_chain_unregister(&gdev->notifier, + &priv->lineinfo_changed_nb); +out_free_bitmap: + bitmap_free(priv->watched_lines); +out_free_priv: + kfree(priv); + return ret; } /** @@ -1271,17 +1451,23 @@ static int gpio_chrdev_open(struct inode *inode, struct file *filp) */ static int gpio_chrdev_release(struct inode *inode, struct file *filp) { - struct gpio_device *gdev = container_of(inode->i_cdev, - struct gpio_device, chrdev); + struct gpio_chardev_data *priv = filp->private_data; + struct gpio_device *gdev = priv->gdev; + bitmap_free(priv->watched_lines); + atomic_notifier_chain_unregister(&gdev->notifier, + &priv->lineinfo_changed_nb); put_device(&gdev->dev); + kfree(priv); + return 0; } - static const struct file_operations gpio_fileops = { .release = gpio_chrdev_release, .open = gpio_chrdev_open, + .poll = lineinfo_watch_poll, + .read = lineinfo_watch_read, .owner = THIS_MODULE, .llseek = no_llseek, .unlocked_ioctl = gpio_ioctl, @@ -1333,12 +1519,12 @@ err_remove_device: return ret; } -static void gpiochip_machine_hog(struct gpio_chip *chip, struct gpiod_hog *hog) +static void gpiochip_machine_hog(struct gpio_chip *gc, struct gpiod_hog *hog) { struct gpio_desc *desc; int rv; - desc = gpiochip_get_desc(chip, hog->chip_hwnum); + desc = gpiochip_get_desc(gc, hog->chip_hwnum); if (IS_ERR(desc)) { pr_err("%s: unable to get GPIO desc: %ld\n", __func__, PTR_ERR(desc)); @@ -1351,18 +1537,18 @@ static void gpiochip_machine_hog(struct gpio_chip *chip, struct gpiod_hog *hog) rv = gpiod_hog(desc, hog->line_name, hog->lflags, hog->dflags); if (rv) pr_err("%s: unable to hog GPIO line (%s:%u): %d\n", - __func__, chip->label, hog->chip_hwnum, rv); + __func__, gc->label, hog->chip_hwnum, rv); } -static void machine_gpiochip_add(struct gpio_chip *chip) +static void machine_gpiochip_add(struct gpio_chip *gc) { struct gpiod_hog *hog; mutex_lock(&gpio_machine_hogs_mutex); list_for_each_entry(hog, &gpio_machine_hogs, list) { - if (!strcmp(chip->label, hog->chip_label)) - gpiochip_machine_hog(chip, hog); + if (!strcmp(gc->label, hog->chip_label)) + gpiochip_machine_hog(gc, hog); } mutex_unlock(&gpio_machine_hogs_mutex); @@ -1381,14 +1567,14 @@ static void gpiochip_setup_devs(void) } } -int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, +int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, struct lock_class_key *lock_key, struct lock_class_key *request_key) { unsigned long flags; int ret = 0; unsigned i; - int base = chip->base; + int base = gc->base; struct gpio_device *gdev; /* @@ -1399,19 +1585,19 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, 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; + gdev->chip = gc; + gc->gpiodev = gdev; + if (gc->parent) { + gdev->dev.parent = gc->parent; + gdev->dev.of_node = gc->parent->of_node; } #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; + if (gc->of_node) + gdev->dev.of_node = gc->of_node; else - chip->of_node = gdev->dev.of_node; + gc->of_node = gdev->dev.of_node; #endif gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); @@ -1422,37 +1608,37 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, dev_set_name(&gdev->dev, GPIOCHIP_NAME "%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) + if (gc->parent && gc->parent->driver) + gdev->owner = gc->parent->driver->owner; + else if (gc->owner) /* TODO: remove chip->owner */ - gdev->owner = chip->owner; + gdev->owner = gc->owner; else gdev->owner = THIS_MODULE; - gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); + gdev->descs = kcalloc(gc->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); if (!gdev->descs) { ret = -ENOMEM; goto err_free_ida; } - if (chip->ngpio == 0) { - chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); + if (gc->ngpio == 0) { + chip_err(gc, "tried to insert a GPIO chip with zero lines\n"); ret = -EINVAL; goto err_free_descs; } - if (chip->ngpio > FASTPATH_NGPIO) - chip_warn(chip, "line cnt %u is greater than fast path cnt %u\n", - chip->ngpio, FASTPATH_NGPIO); + if (gc->ngpio > FASTPATH_NGPIO) + chip_warn(gc, "line cnt %u is greater than fast path cnt %u\n", + gc->ngpio, FASTPATH_NGPIO); - gdev->label = kstrdup_const(chip->label ?: "unknown", GFP_KERNEL); + gdev->label = kstrdup_const(gc->label ?: "unknown", GFP_KERNEL); if (!gdev->label) { ret = -ENOMEM; goto err_free_descs; } - gdev->ngpio = chip->ngpio; + gdev->ngpio = gc->ngpio; gdev->data = data; spin_lock_irqsave(&gpio_lock, flags); @@ -1465,7 +1651,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, * of the sysfs interface anyways. */ if (base < 0) { - base = gpiochip_find_base(chip->ngpio); + base = gpiochip_find_base(gc->ngpio); if (base < 0) { ret = base; spin_unlock_irqrestore(&gpio_lock, flags); @@ -1477,7 +1663,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, * see if anyone makes use of this, else drop this and assign * a poison instead. */ - chip->base = base; + gc->base = base; } gdev->base = base; @@ -1487,60 +1673,62 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, goto err_free_label; } - for (i = 0; i < chip->ngpio; i++) + for (i = 0; i < gc->ngpio; i++) gdev->descs[i].gdev = gdev; spin_unlock_irqrestore(&gpio_lock, flags); + ATOMIC_INIT_NOTIFIER_HEAD(&gdev->notifier); + #ifdef CONFIG_PINCTRL INIT_LIST_HEAD(&gdev->pin_ranges); #endif - ret = gpiochip_set_desc_names(chip); + ret = gpiochip_set_desc_names(gc); if (ret) goto err_remove_from_list; - ret = gpiochip_alloc_valid_mask(chip); + ret = gpiochip_alloc_valid_mask(gc); if (ret) goto err_remove_from_list; - ret = of_gpiochip_add(chip); + ret = of_gpiochip_add(gc); if (ret) goto err_free_gpiochip_mask; - ret = gpiochip_init_valid_mask(chip); + ret = gpiochip_init_valid_mask(gc); if (ret) goto err_remove_of_chip; - for (i = 0; i < chip->ngpio; i++) { + for (i = 0; i < gc->ngpio; i++) { struct gpio_desc *desc = &gdev->descs[i]; - if (chip->get_direction && gpiochip_line_is_valid(chip, i)) { + if (gc->get_direction && gpiochip_line_is_valid(gc, i)) { assign_bit(FLAG_IS_OUT, - &desc->flags, !chip->get_direction(chip, i)); + &desc->flags, !gc->get_direction(gc, i)); } else { assign_bit(FLAG_IS_OUT, - &desc->flags, !chip->direction_input); + &desc->flags, !gc->direction_input); } } - ret = gpiochip_add_pin_ranges(chip); + ret = gpiochip_add_pin_ranges(gc); if (ret) goto err_remove_of_chip; - acpi_gpiochip_add(chip); + acpi_gpiochip_add(gc); - machine_gpiochip_add(chip); + machine_gpiochip_add(gc); - ret = gpiochip_irqchip_init_valid_mask(chip); + ret = gpiochip_irqchip_init_valid_mask(gc); if (ret) goto err_remove_acpi_chip; - ret = gpiochip_irqchip_init_hw(chip); + ret = gpiochip_irqchip_init_hw(gc); if (ret) goto err_remove_acpi_chip; - ret = gpiochip_add_irqchip(chip, lock_key, request_key); + ret = gpiochip_add_irqchip(gc, lock_key, request_key); if (ret) goto err_remove_irqchip_mask; @@ -1560,17 +1748,17 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, return 0; err_remove_irqchip: - gpiochip_irqchip_remove(chip); + gpiochip_irqchip_remove(gc); err_remove_irqchip_mask: - gpiochip_irqchip_free_valid_mask(chip); + gpiochip_irqchip_free_valid_mask(gc); err_remove_acpi_chip: - acpi_gpiochip_remove(chip); + acpi_gpiochip_remove(gc); err_remove_of_chip: - gpiochip_free_hogs(chip); - of_gpiochip_remove(chip); + gpiochip_free_hogs(gc); + of_gpiochip_remove(gc); err_free_gpiochip_mask: - gpiochip_remove_pin_ranges(chip); - gpiochip_free_valid_mask(chip); + gpiochip_remove_pin_ranges(gc); + gpiochip_free_valid_mask(gc); err_remove_from_list: spin_lock_irqsave(&gpio_lock, flags); list_del(&gdev->list); @@ -1585,7 +1773,7 @@ err_free_gdev: /* failures here can mean systems won't boot... */ pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__, gdev->base, gdev->base + gdev->ngpio - 1, - chip->label ? : "generic", ret); + gc->label ? : "generic", ret); kfree(gdev); return ret; } @@ -1593,41 +1781,39 @@ EXPORT_SYMBOL_GPL(gpiochip_add_data_with_key); /** * gpiochip_get_data() - get per-subdriver data for the chip - * @chip: GPIO chip + * @gc: GPIO chip * * Returns: * The per-subdriver data for the chip. */ -void *gpiochip_get_data(struct gpio_chip *chip) +void *gpiochip_get_data(struct gpio_chip *gc) { - return chip->gpiodev->data; + return gc->gpiodev->data; } EXPORT_SYMBOL_GPL(gpiochip_get_data); /** * gpiochip_remove() - unregister a gpio_chip - * @chip: the chip to unregister + * @gc: the chip to unregister * * A gpio_chip with any GPIOs still requested may not be removed. */ -void gpiochip_remove(struct gpio_chip *chip) +void gpiochip_remove(struct gpio_chip *gc) { - struct gpio_device *gdev = chip->gpiodev; - struct gpio_desc *desc; + struct gpio_device *gdev = gc->gpiodev; unsigned long flags; - unsigned i; - bool requested = false; + unsigned int i; /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ gpiochip_sysfs_unregister(gdev); - gpiochip_free_hogs(chip); + gpiochip_free_hogs(gc); /* Numb the device, cancelling all outstanding operations */ gdev->chip = NULL; - gpiochip_irqchip_remove(chip); - acpi_gpiochip_remove(chip); - of_gpiochip_remove(chip); - gpiochip_remove_pin_ranges(chip); - gpiochip_free_valid_mask(chip); + gpiochip_irqchip_remove(gc); + acpi_gpiochip_remove(gc); + of_gpiochip_remove(gc); + gpiochip_remove_pin_ranges(gc); + gpiochip_free_valid_mask(gc); /* * We accept no more calls into the driver from this point, so * NULL the driver data pointer @@ -1636,13 +1822,12 @@ void gpiochip_remove(struct gpio_chip *chip) spin_lock_irqsave(&gpio_lock, flags); for (i = 0; i < gdev->ngpio; i++) { - desc = &gdev->descs[i]; - if (test_bit(FLAG_REQUESTED, &desc->flags)) - requested = true; + if (gpiochip_is_requested(gc, i)) + break; } spin_unlock_irqrestore(&gpio_lock, flags); - if (requested) + if (i != gdev->ngpio) dev_crit(&gdev->dev, "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); @@ -1657,52 +1842,6 @@ void gpiochip_remove(struct gpio_chip *chip) } 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); -} - -/** - * devm_gpiochip_add_data() - Resource managed gpiochip_add_data() - * @dev: pointer to the device that gpio_chip belongs to. - * @chip: the chip to register, with chip->base initialized - * @data: driver-private data associated with this chip - * - * Context: potentially before irqs will work - * - * The gpio chip automatically be released when the device is unbound. - * - * 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. - */ -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); - /** * gpiochip_find() - iterator for locating a specific gpio_chip * @data: data to pass to match function @@ -1715,31 +1854,31 @@ EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); * more gpio_chips. */ struct gpio_chip *gpiochip_find(void *data, - int (*match)(struct gpio_chip *chip, + int (*match)(struct gpio_chip *gc, void *data)) { struct gpio_device *gdev; - struct gpio_chip *chip = NULL; + struct gpio_chip *gc = NULL; unsigned long flags; spin_lock_irqsave(&gpio_lock, flags); list_for_each_entry(gdev, &gpio_devices, list) if (gdev->chip && match(gdev->chip, data)) { - chip = gdev->chip; + gc = gdev->chip; break; } spin_unlock_irqrestore(&gpio_lock, flags); - return chip; + return gc; } EXPORT_SYMBOL_GPL(gpiochip_find); -static int gpiochip_match_name(struct gpio_chip *chip, void *data) +static int gpiochip_match_name(struct gpio_chip *gc, void *data) { const char *name = data; - return !strcmp(chip->label, name); + return !strcmp(gc->label, name); } static struct gpio_chip *find_chip_by_name(const char *name) @@ -1779,21 +1918,21 @@ static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gc) return 0; } -static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) +static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gc) { - bitmap_free(gpiochip->irq.valid_mask); - gpiochip->irq.valid_mask = NULL; + bitmap_free(gc->irq.valid_mask); + gc->irq.valid_mask = NULL; } -bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, +bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gc, unsigned int offset) { - if (!gpiochip_line_is_valid(gpiochip, offset)) + if (!gpiochip_line_is_valid(gc, offset)) return false; /* No mask means all valid */ - if (likely(!gpiochip->irq.valid_mask)) + if (likely(!gc->irq.valid_mask)) return true; - return test_bit(offset, gpiochip->irq.valid_mask); + return test_bit(offset, gc->irq.valid_mask); } EXPORT_SYMBOL_GPL(gpiochip_irqchip_irq_valid); @@ -1845,16 +1984,16 @@ static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gc, /** * gpiochip_set_nested_irqchip() - connects a nested irqchip to a gpiochip - * @gpiochip: the gpiochip to set the irqchip nested handler to + * @gc: the gpiochip to set the irqchip nested handler to * @irqchip: the irqchip to nest to the gpiochip * @parent_irq: the irq number corresponding to the parent IRQ for this * nested irqchip */ -void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip, +void gpiochip_set_nested_irqchip(struct gpio_chip *gc, struct irq_chip *irqchip, unsigned int parent_irq) { - gpiochip_set_cascaded_irqchip(gpiochip, parent_irq, NULL); + gpiochip_set_cascaded_irqchip(gc, parent_irq, NULL); } EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip); @@ -2031,7 +2170,7 @@ static int gpiochip_hierarchy_irq_domain_alloc(struct irq_domain *d, return ret; } -static unsigned int gpiochip_child_offset_to_irq_noop(struct gpio_chip *chip, +static unsigned int gpiochip_child_offset_to_irq_noop(struct gpio_chip *gc, unsigned int offset) { return offset; @@ -2091,7 +2230,7 @@ static bool gpiochip_hierarchy_is_hierarchical(struct gpio_chip *gc) return !!gc->irq.parent_domain; } -void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *chip, +void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc, unsigned int parent_hwirq, unsigned int parent_type) { @@ -2101,7 +2240,7 @@ void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *chip, if (!fwspec) return NULL; - fwspec->fwnode = chip->irq.parent_domain->fwnode; + fwspec->fwnode = gc->irq.parent_domain->fwnode; fwspec->param_count = 2; fwspec->param[0] = parent_hwirq; fwspec->param[1] = parent_type; @@ -2110,7 +2249,7 @@ void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *chip, } EXPORT_SYMBOL_GPL(gpiochip_populate_parent_fwspec_twocell); -void *gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *chip, +void *gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc, unsigned int parent_hwirq, unsigned int parent_type) { @@ -2120,7 +2259,7 @@ void *gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *chip, if (!fwspec) return NULL; - fwspec->fwnode = chip->irq.parent_domain->fwnode; + fwspec->fwnode = gc->irq.parent_domain->fwnode; fwspec->param_count = 4; fwspec->param[0] = 0; fwspec->param[1] = parent_hwirq; @@ -2158,28 +2297,28 @@ static bool gpiochip_hierarchy_is_hierarchical(struct gpio_chip *gc) int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hwirq) { - struct gpio_chip *chip = d->host_data; + struct gpio_chip *gc = d->host_data; int ret = 0; - if (!gpiochip_irqchip_irq_valid(chip, hwirq)) + if (!gpiochip_irqchip_irq_valid(gc, hwirq)) return -ENXIO; - irq_set_chip_data(irq, chip); + irq_set_chip_data(irq, gc); /* * This lock class tells lockdep that GPIO irqs are in a different * category than their parents, so it won't report false recursion. */ - irq_set_lockdep_class(irq, chip->irq.lock_key, chip->irq.request_key); - irq_set_chip_and_handler(irq, chip->irq.chip, chip->irq.handler); + irq_set_lockdep_class(irq, gc->irq.lock_key, gc->irq.request_key); + irq_set_chip_and_handler(irq, gc->irq.chip, gc->irq.handler); /* Chips that use nested thread handlers have them marked */ - if (chip->irq.threaded) + if (gc->irq.threaded) irq_set_nested_thread(irq, 1); irq_set_noprobe(irq); - if (chip->irq.num_parents == 1) - ret = irq_set_parent(irq, chip->irq.parents[0]); - else if (chip->irq.map) - ret = irq_set_parent(irq, chip->irq.map[hwirq]); + if (gc->irq.num_parents == 1) + ret = irq_set_parent(irq, gc->irq.parents[0]); + else if (gc->irq.map) + ret = irq_set_parent(irq, gc->irq.map[hwirq]); if (ret < 0) return ret; @@ -2188,8 +2327,8 @@ int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, * No set-up of the hardware will happen if IRQ_TYPE_NONE * is passed as default type. */ - if (chip->irq.default_type != IRQ_TYPE_NONE) - irq_set_irq_type(irq, chip->irq.default_type); + if (gc->irq.default_type != IRQ_TYPE_NONE) + irq_set_irq_type(irq, gc->irq.default_type); return 0; } @@ -2197,9 +2336,9 @@ EXPORT_SYMBOL_GPL(gpiochip_irq_map); void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) { - struct gpio_chip *chip = d->host_data; + struct gpio_chip *gc = d->host_data; - if (chip->irq.threaded) + if (gc->irq.threaded) irq_set_nested_thread(irq, 0); irq_set_chip_and_handler(irq, NULL, NULL); irq_set_chip_data(irq, NULL); @@ -2231,9 +2370,9 @@ static const struct irq_domain_ops gpiochip_domain_ops = { int gpiochip_irq_domain_activate(struct irq_domain *domain, struct irq_data *data, bool reserve) { - struct gpio_chip *chip = domain->host_data; + struct gpio_chip *gc = domain->host_data; - return gpiochip_lock_as_irq(chip, data->hwirq); + return gpiochip_lock_as_irq(gc, data->hwirq); } EXPORT_SYMBOL_GPL(gpiochip_irq_domain_activate); @@ -2249,17 +2388,17 @@ EXPORT_SYMBOL_GPL(gpiochip_irq_domain_activate); void gpiochip_irq_domain_deactivate(struct irq_domain *domain, struct irq_data *data) { - struct gpio_chip *chip = domain->host_data; + struct gpio_chip *gc = domain->host_data; - return gpiochip_unlock_as_irq(chip, data->hwirq); + return gpiochip_unlock_as_irq(gc, data->hwirq); } EXPORT_SYMBOL_GPL(gpiochip_irq_domain_deactivate); -static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) +static int gpiochip_to_irq(struct gpio_chip *gc, unsigned offset) { - struct irq_domain *domain = chip->irq.domain; + struct irq_domain *domain = gc->irq.domain; - if (!gpiochip_irqchip_irq_valid(chip, offset)) + if (!gpiochip_irqchip_irq_valid(gc, offset)) return -ENXIO; #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY @@ -2268,7 +2407,7 @@ static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) spec.fwnode = domain->fwnode; spec.param_count = 2; - spec.param[0] = chip->irq.child_offset_to_irq(chip, offset); + spec.param[0] = gc->irq.child_offset_to_irq(gc, offset); spec.param[1] = IRQ_TYPE_NONE; return irq_create_fwspec_mapping(&spec); @@ -2280,32 +2419,32 @@ static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) static int gpiochip_irq_reqres(struct irq_data *d) { - struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); - return gpiochip_reqres_irq(chip, d->hwirq); + return gpiochip_reqres_irq(gc, d->hwirq); } static void gpiochip_irq_relres(struct irq_data *d) { - struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); - gpiochip_relres_irq(chip, d->hwirq); + gpiochip_relres_irq(gc, d->hwirq); } static void gpiochip_irq_enable(struct irq_data *d) { - struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); - gpiochip_enable_irq(chip, d->hwirq); - if (chip->irq.irq_enable) - chip->irq.irq_enable(d); + gpiochip_enable_irq(gc, d->hwirq); + if (gc->irq.irq_enable) + gc->irq.irq_enable(d); else - chip->irq.chip->irq_unmask(d); + gc->irq.chip->irq_unmask(d); } static void gpiochip_irq_disable(struct irq_data *d) { - struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); /* * Since we override .irq_disable() we need to mimic the @@ -2314,23 +2453,23 @@ static void gpiochip_irq_disable(struct irq_data *d) * behaviour of mask_irq() which calls .irq_mask() if * it exists. */ - if (chip->irq.irq_disable) - chip->irq.irq_disable(d); - else if (chip->irq.chip->irq_mask) - chip->irq.chip->irq_mask(d); - gpiochip_disable_irq(chip, d->hwirq); + if (gc->irq.irq_disable) + gc->irq.irq_disable(d); + else if (gc->irq.chip->irq_mask) + gc->irq.chip->irq_mask(d); + gpiochip_disable_irq(gc, d->hwirq); } -static void gpiochip_set_irq_hooks(struct gpio_chip *gpiochip) +static void gpiochip_set_irq_hooks(struct gpio_chip *gc) { - struct irq_chip *irqchip = gpiochip->irq.chip; + struct irq_chip *irqchip = gc->irq.chip; if (!irqchip->irq_request_resources && !irqchip->irq_release_resources) { irqchip->irq_request_resources = gpiochip_irq_reqres; irqchip->irq_release_resources = gpiochip_irq_relres; } - if (WARN_ON(gpiochip->irq.irq_enable)) + if (WARN_ON(gc->irq.irq_enable)) return; /* Check if the irqchip already has this hook... */ if (irqchip->irq_enable == gpiochip_irq_enable) { @@ -2338,27 +2477,27 @@ static void gpiochip_set_irq_hooks(struct gpio_chip *gpiochip) * ...and if so, give a gentle warning that this is bad * practice. */ - chip_info(gpiochip, + chip_info(gc, "detected irqchip that is shared with multiple gpiochips: please fix the driver.\n"); return; } - gpiochip->irq.irq_enable = irqchip->irq_enable; - gpiochip->irq.irq_disable = irqchip->irq_disable; + gc->irq.irq_enable = irqchip->irq_enable; + gc->irq.irq_disable = irqchip->irq_disable; irqchip->irq_enable = gpiochip_irq_enable; irqchip->irq_disable = gpiochip_irq_disable; } /** * gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip - * @gpiochip: the GPIO chip to add the IRQ chip to + * @gc: the GPIO chip to add the IRQ chip to * @lock_key: lockdep class for IRQ lock * @request_key: lockdep class for IRQ request */ -static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, +static int gpiochip_add_irqchip(struct gpio_chip *gc, struct lock_class_key *lock_key, struct lock_class_key *request_key) { - struct irq_chip *irqchip = gpiochip->irq.chip; + struct irq_chip *irqchip = gc->irq.chip; const struct irq_domain_ops *ops = NULL; struct device_node *np; unsigned int type; @@ -2367,13 +2506,13 @@ static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, if (!irqchip) return 0; - if (gpiochip->irq.parent_handler && gpiochip->can_sleep) { - chip_err(gpiochip, "you cannot have chained interrupts on a chip that may sleep\n"); + if (gc->irq.parent_handler && gc->can_sleep) { + chip_err(gc, "you cannot have chained interrupts on a chip that may sleep\n"); return -EINVAL; } - np = gpiochip->gpiodev->dev.of_node; - type = gpiochip->irq.default_type; + np = gc->gpiodev->dev.of_node; + type = gc->irq.default_type; /* * Specifying a default trigger is a terrible idea if DT or ACPI is @@ -2384,74 +2523,74 @@ static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, "%s: Ignoring %u default trigger\n", np->full_name, type)) type = IRQ_TYPE_NONE; - if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { - acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), + if (has_acpi_companion(gc->parent) && type != IRQ_TYPE_NONE) { + acpi_handle_warn(ACPI_HANDLE(gc->parent), "Ignoring %u default trigger\n", type); type = IRQ_TYPE_NONE; } - gpiochip->to_irq = gpiochip_to_irq; - gpiochip->irq.default_type = type; - gpiochip->irq.lock_key = lock_key; - gpiochip->irq.request_key = request_key; + gc->to_irq = gpiochip_to_irq; + gc->irq.default_type = type; + gc->irq.lock_key = lock_key; + gc->irq.request_key = request_key; /* If a parent irqdomain is provided, let's build a hierarchy */ - if (gpiochip_hierarchy_is_hierarchical(gpiochip)) { - int ret = gpiochip_hierarchy_add_domain(gpiochip); + if (gpiochip_hierarchy_is_hierarchical(gc)) { + int ret = gpiochip_hierarchy_add_domain(gc); if (ret) return ret; } else { /* Some drivers provide custom irqdomain ops */ - if (gpiochip->irq.domain_ops) - ops = gpiochip->irq.domain_ops; + if (gc->irq.domain_ops) + ops = gc->irq.domain_ops; if (!ops) ops = &gpiochip_domain_ops; - gpiochip->irq.domain = irq_domain_add_simple(np, - gpiochip->ngpio, - gpiochip->irq.first, - ops, gpiochip); - if (!gpiochip->irq.domain) + gc->irq.domain = irq_domain_add_simple(np, + gc->ngpio, + gc->irq.first, + ops, gc); + if (!gc->irq.domain) return -EINVAL; } - if (gpiochip->irq.parent_handler) { - void *data = gpiochip->irq.parent_handler_data ?: gpiochip; + if (gc->irq.parent_handler) { + void *data = gc->irq.parent_handler_data ?: gc; - for (i = 0; i < gpiochip->irq.num_parents; i++) { + for (i = 0; i < gc->irq.num_parents; i++) { /* * The parent IRQ chip is already using the chip_data * for this IRQ chip, so our callbacks simply use the * handler_data. */ - irq_set_chained_handler_and_data(gpiochip->irq.parents[i], - gpiochip->irq.parent_handler, + irq_set_chained_handler_and_data(gc->irq.parents[i], + gc->irq.parent_handler, data); } } - gpiochip_set_irq_hooks(gpiochip); + gpiochip_set_irq_hooks(gc); - acpi_gpiochip_request_interrupts(gpiochip); + acpi_gpiochip_request_interrupts(gc); return 0; } /** * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip - * @gpiochip: the gpiochip to remove the irqchip from + * @gc: the gpiochip to remove the irqchip from * * This is called only from gpiochip_remove() */ -static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) +static void gpiochip_irqchip_remove(struct gpio_chip *gc) { - struct irq_chip *irqchip = gpiochip->irq.chip; + struct irq_chip *irqchip = gc->irq.chip; unsigned int offset; - acpi_gpiochip_free_interrupts(gpiochip); + acpi_gpiochip_free_interrupts(gc); - if (irqchip && gpiochip->irq.parent_handler) { - struct gpio_irq_chip *irq = &gpiochip->irq; + if (irqchip && gc->irq.parent_handler) { + struct gpio_irq_chip *irq = &gc->irq; unsigned int i; for (i = 0; i < irq->num_parents; i++) @@ -2460,18 +2599,18 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) } /* Remove all IRQ mappings and delete the domain */ - if (gpiochip->irq.domain) { + if (gc->irq.domain) { unsigned int irq; - for (offset = 0; offset < gpiochip->ngpio; offset++) { - if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) + for (offset = 0; offset < gc->ngpio; offset++) { + if (!gpiochip_irqchip_irq_valid(gc, offset)) continue; - irq = irq_find_mapping(gpiochip->irq.domain, offset); + irq = irq_find_mapping(gc->irq.domain, offset); irq_dispose_mapping(irq); } - irq_domain_remove(gpiochip->irq.domain); + irq_domain_remove(gc->irq.domain); } if (irqchip) { @@ -2480,20 +2619,20 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) irqchip->irq_release_resources = NULL; } if (irqchip->irq_enable == gpiochip_irq_enable) { - irqchip->irq_enable = gpiochip->irq.irq_enable; - irqchip->irq_disable = gpiochip->irq.irq_disable; + irqchip->irq_enable = gc->irq.irq_enable; + irqchip->irq_disable = gc->irq.irq_disable; } } - gpiochip->irq.irq_enable = NULL; - gpiochip->irq.irq_disable = NULL; - gpiochip->irq.chip = NULL; + gc->irq.irq_enable = NULL; + gc->irq.irq_disable = NULL; + gc->irq.chip = NULL; - gpiochip_irqchip_free_valid_mask(gpiochip); + gpiochip_irqchip_free_valid_mask(gc); } /** * gpiochip_irqchip_add_key() - adds an irqchip to a gpiochip - * @gpiochip: the gpiochip to add the irqchip to + * @gc: the gpiochip to add the irqchip to * @irqchip: the irqchip to add to the gpiochip * @first_irq: if not dynamically assigned, the base (first) IRQ to * allocate gpiochip irqs from @@ -2518,7 +2657,7 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) * the pins on the gpiochip can generate a unique IRQ. Everything else * need to be open coded. */ -int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip, +int gpiochip_irqchip_add_key(struct gpio_chip *gc, struct irq_chip *irqchip, unsigned int first_irq, irq_flow_handler_t handler, @@ -2529,23 +2668,23 @@ int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip, { struct device_node *of_node; - if (!gpiochip || !irqchip) + if (!gc || !irqchip) return -EINVAL; - if (!gpiochip->parent) { + if (!gc->parent) { pr_err("missing gpiochip .dev parent pointer\n"); return -EINVAL; } - gpiochip->irq.threaded = threaded; - of_node = gpiochip->parent->of_node; + gc->irq.threaded = threaded; + of_node = gc->parent->of_node; #ifdef CONFIG_OF_GPIO /* * If the gpiochip has an assigned OF node this takes precedence - * FIXME: get rid of this and use gpiochip->parent->of_node + * FIXME: get rid of this and use gc->parent->of_node * everywhere */ - if (gpiochip->of_node) - of_node = gpiochip->of_node; + if (gc->of_node) + of_node = gc->of_node; #endif /* * Specifying a default trigger is a terrible idea if DT or ACPI is @@ -2555,29 +2694,29 @@ int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip, if (WARN(of_node && type != IRQ_TYPE_NONE, "%pOF: Ignoring %d default trigger\n", of_node, type)) type = IRQ_TYPE_NONE; - if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { - acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), + if (has_acpi_companion(gc->parent) && type != IRQ_TYPE_NONE) { + acpi_handle_warn(ACPI_HANDLE(gc->parent), "Ignoring %d default trigger\n", type); type = IRQ_TYPE_NONE; } - gpiochip->irq.chip = irqchip; - gpiochip->irq.handler = handler; - gpiochip->irq.default_type = type; - gpiochip->to_irq = gpiochip_to_irq; - gpiochip->irq.lock_key = lock_key; - gpiochip->irq.request_key = request_key; - gpiochip->irq.domain = irq_domain_add_simple(of_node, - gpiochip->ngpio, first_irq, - &gpiochip_domain_ops, gpiochip); - if (!gpiochip->irq.domain) { - gpiochip->irq.chip = NULL; + gc->irq.chip = irqchip; + gc->irq.handler = handler; + gc->irq.default_type = type; + gc->to_irq = gpiochip_to_irq; + gc->irq.lock_key = lock_key; + gc->irq.request_key = request_key; + gc->irq.domain = irq_domain_add_simple(of_node, + gc->ngpio, first_irq, + &gpiochip_domain_ops, gc); + if (!gc->irq.domain) { + gc->irq.chip = NULL; return -EINVAL; } - gpiochip_set_irq_hooks(gpiochip); + gpiochip_set_irq_hooks(gc); - acpi_gpiochip_request_interrupts(gpiochip); + acpi_gpiochip_request_interrupts(gc); return 0; } @@ -2585,60 +2724,65 @@ EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key); #else /* CONFIG_GPIOLIB_IRQCHIP */ -static inline int gpiochip_add_irqchip(struct gpio_chip *gpiochip, +static inline int gpiochip_add_irqchip(struct gpio_chip *gc, struct lock_class_key *lock_key, struct lock_class_key *request_key) { return 0; } -static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} +static void gpiochip_irqchip_remove(struct gpio_chip *gc) {} -static inline int gpiochip_irqchip_init_hw(struct gpio_chip *gpiochip) +static inline int gpiochip_irqchip_init_hw(struct gpio_chip *gc) { return 0; } -static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) +static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gc) { return 0; } -static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) +static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gc) { } #endif /* CONFIG_GPIOLIB_IRQCHIP */ /** * gpiochip_generic_request() - request the gpio function for a pin - * @chip: the gpiochip owning the GPIO + * @gc: the gpiochip owning the GPIO * @offset: the offset of the GPIO to request for GPIO function */ -int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) +int gpiochip_generic_request(struct gpio_chip *gc, unsigned offset) { - return pinctrl_gpio_request(chip->gpiodev->base + offset); +#ifdef CONFIG_PINCTRL + if (list_empty(&gc->gpiodev->pin_ranges)) + return 0; +#endif + + return pinctrl_gpio_request(gc->gpiodev->base + offset); } EXPORT_SYMBOL_GPL(gpiochip_generic_request); /** * gpiochip_generic_free() - free the gpio function from a pin - * @chip: the gpiochip to request the gpio function for + * @gc: the gpiochip to request the gpio function for * @offset: the offset of the GPIO to free from GPIO function */ -void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) +void gpiochip_generic_free(struct gpio_chip *gc, unsigned offset) { - pinctrl_gpio_free(chip->gpiodev->base + offset); + pinctrl_gpio_free(gc->gpiodev->base + offset); } EXPORT_SYMBOL_GPL(gpiochip_generic_free); /** * gpiochip_generic_config() - apply configuration for a pin - * @chip: the gpiochip owning the GPIO + * @gc: the gpiochip owning the GPIO * @offset: the offset of the GPIO to apply the configuration * @config: the configuration to be applied */ -int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset, +int gpiochip_generic_config(struct gpio_chip *gc, unsigned offset, unsigned long config) { - return pinctrl_gpio_set_config(chip->gpiodev->base + offset, config); + return pinctrl_gpio_set_config(gc->gpiodev->base + offset, config); } EXPORT_SYMBOL_GPL(gpiochip_generic_config); @@ -2646,7 +2790,7 @@ EXPORT_SYMBOL_GPL(gpiochip_generic_config); /** * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping - * @chip: the gpiochip to add the range for + * @gc: the gpiochip to add the range for * @pctldev: the pin controller to map to * @gpio_offset: the start offset in the current gpio_chip number space * @pin_group: name of the pin group inside the pin controller @@ -2656,24 +2800,24 @@ EXPORT_SYMBOL_GPL(gpiochip_generic_config); * Documentation/devicetree/bindings/gpio/gpio.txt on how to * bind pinctrl and gpio drivers via the "gpio-ranges" property. */ -int gpiochip_add_pingroup_range(struct gpio_chip *chip, +int gpiochip_add_pingroup_range(struct gpio_chip *gc, struct pinctrl_dev *pctldev, unsigned int gpio_offset, const char *pin_group) { struct gpio_pin_range *pin_range; - struct gpio_device *gdev = chip->gpiodev; + struct gpio_device *gdev = gc->gpiodev; int ret; pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); if (!pin_range) { - chip_err(chip, "failed to allocate pin ranges\n"); + chip_err(gc, "failed to allocate pin ranges\n"); return -ENOMEM; } /* Use local offset as range ID */ pin_range->range.id = gpio_offset; - pin_range->range.gc = chip; - pin_range->range.name = chip->label; + pin_range->range.gc = gc; + pin_range->range.name = gc->label; pin_range->range.base = gdev->base + gpio_offset; pin_range->pctldev = pctldev; @@ -2687,7 +2831,7 @@ int gpiochip_add_pingroup_range(struct gpio_chip *chip, pinctrl_add_gpio_range(pctldev, &pin_range->range); - chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", + chip_dbg(gc, "created GPIO range %d->%d ==> %s PINGRP %s\n", gpio_offset, gpio_offset + pin_range->range.npins - 1, pinctrl_dev_get_devname(pctldev), pin_group); @@ -2699,7 +2843,7 @@ EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); /** * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping - * @chip: the gpiochip to add the range for + * @gc: the gpiochip to add the range for * @pinctl_name: the dev_name() of the pin controller to map to * @gpio_offset: the start offset in the current gpio_chip number space * @pin_offset: the start offset in the pin controller number space @@ -2714,24 +2858,24 @@ EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); * Documentation/devicetree/bindings/gpio/gpio.txt on how to * bind pinctrl and gpio drivers via the "gpio-ranges" property. */ -int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, +int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name, unsigned int gpio_offset, unsigned int pin_offset, unsigned int npins) { struct gpio_pin_range *pin_range; - struct gpio_device *gdev = chip->gpiodev; + struct gpio_device *gdev = gc->gpiodev; int ret; pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); if (!pin_range) { - chip_err(chip, "failed to allocate pin ranges\n"); + chip_err(gc, "failed to allocate pin ranges\n"); return -ENOMEM; } /* Use local offset as range ID */ pin_range->range.id = gpio_offset; - pin_range->range.gc = chip; - pin_range->range.name = chip->label; + pin_range->range.gc = gc; + pin_range->range.name = gc->label; pin_range->range.base = gdev->base + gpio_offset; pin_range->range.pin_base = pin_offset; pin_range->range.npins = npins; @@ -2739,11 +2883,11 @@ int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, &pin_range->range); if (IS_ERR(pin_range->pctldev)) { ret = PTR_ERR(pin_range->pctldev); - chip_err(chip, "could not create pin range\n"); + chip_err(gc, "could not create pin range\n"); kfree(pin_range); return ret; } - chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", + chip_dbg(gc, "created GPIO range %d->%d ==> %s PIN %d->%d\n", gpio_offset, gpio_offset + npins - 1, pinctl_name, pin_offset, pin_offset + npins - 1); @@ -2756,12 +2900,12 @@ EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); /** * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings - * @chip: the chip to remove all the mappings for + * @gc: the chip to remove all the mappings for */ -void gpiochip_remove_pin_ranges(struct gpio_chip *chip) +void gpiochip_remove_pin_ranges(struct gpio_chip *gc) { struct gpio_pin_range *pin_range, *tmp; - struct gpio_device *gdev = chip->gpiodev; + struct gpio_device *gdev = gc->gpiodev; list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { list_del(&pin_range->node); @@ -2780,7 +2924,7 @@ EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); */ static int gpiod_request_commit(struct gpio_desc *desc, const char *label) { - struct gpio_chip *chip = desc->gdev->chip; + struct gpio_chip *gc = desc->gdev->chip; int ret; unsigned long flags; unsigned offset; @@ -2806,12 +2950,12 @@ static int gpiod_request_commit(struct gpio_desc *desc, const char *label) goto done; } - if (chip->request) { - /* chip->request may sleep */ + if (gc->request) { + /* gc->request may sleep */ spin_unlock_irqrestore(&gpio_lock, flags); offset = gpio_chip_hwgpio(desc); - if (gpiochip_line_is_valid(chip, offset)) - ret = chip->request(chip, offset); + if (gpiochip_line_is_valid(gc, offset)) + ret = gc->request(gc, offset); else ret = -EINVAL; spin_lock_irqsave(&gpio_lock, flags); @@ -2823,14 +2967,16 @@ static int gpiod_request_commit(struct gpio_desc *desc, const char *label) goto done; } } - if (chip->get_direction) { - /* chip->get_direction may sleep */ + if (gc->get_direction) { + /* gc->get_direction may sleep */ spin_unlock_irqrestore(&gpio_lock, flags); gpiod_get_direction(desc); spin_lock_irqsave(&gpio_lock, flags); } done: spin_unlock_irqrestore(&gpio_lock, flags); + atomic_notifier_call_chain(&desc->gdev->notifier, + GPIOLINE_CHANGED_REQUESTED, desc); return ret; } @@ -2898,7 +3044,7 @@ static bool gpiod_free_commit(struct gpio_desc *desc) { bool ret = false; unsigned long flags; - struct gpio_chip *chip; + struct gpio_chip *gc; might_sleep(); @@ -2906,12 +3052,12 @@ static bool gpiod_free_commit(struct gpio_desc *desc) spin_lock_irqsave(&gpio_lock, flags); - chip = desc->gdev->chip; - if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { - if (chip->free) { + gc = desc->gdev->chip; + if (gc && test_bit(FLAG_REQUESTED, &desc->flags)) { + if (gc->free) { spin_unlock_irqrestore(&gpio_lock, flags); - might_sleep_if(chip->can_sleep); - chip->free(chip, gpio_chip_hwgpio(desc)); + might_sleep_if(gc->can_sleep); + gc->free(gc, gpio_chip_hwgpio(desc)); spin_lock_irqsave(&gpio_lock, flags); } kfree_const(desc->label); @@ -2924,10 +3070,16 @@ static bool gpiod_free_commit(struct gpio_desc *desc) clear_bit(FLAG_PULL_DOWN, &desc->flags); clear_bit(FLAG_BIAS_DISABLE, &desc->flags); clear_bit(FLAG_IS_HOGGED, &desc->flags); +#ifdef CONFIG_OF_DYNAMIC + desc->hog = NULL; +#endif ret = true; } spin_unlock_irqrestore(&gpio_lock, flags); + atomic_notifier_call_chain(&desc->gdev->notifier, + GPIOLINE_CHANGED_RELEASED, desc); + return ret; } @@ -2943,7 +3095,7 @@ void gpiod_free(struct gpio_desc *desc) /** * gpiochip_is_requested - return string iff signal was requested - * @chip: controller managing the signal + * @gc: controller managing the signal * @offset: of signal within controller's 0..(ngpio - 1) range * * Returns NULL if the GPIO is not currently requested, else a string. @@ -2954,14 +3106,16 @@ void gpiod_free(struct gpio_desc *desc) * help with diagnostics, and knowing that the signal is used as a GPIO * can help avoid accidentally multiplexing it to another controller. */ -const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) +const char *gpiochip_is_requested(struct gpio_chip *gc, unsigned offset) { struct gpio_desc *desc; - if (offset >= chip->ngpio) + if (offset >= gc->ngpio) return NULL; - desc = &chip->gpiodev->descs[offset]; + desc = gpiochip_get_desc(gc, offset); + if (IS_ERR(desc)) + return NULL; if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) return NULL; @@ -2971,7 +3125,7 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested); /** * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor - * @chip: GPIO chip + * @gc: GPIO chip * @hwnum: hardware number of the GPIO for which to request the descriptor * @label: label for the GPIO * @lflags: lookup flags for this GPIO or 0 if default, this can be used to @@ -2990,17 +3144,17 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested); * A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error * code on failure. */ -struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, +struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc, unsigned int hwnum, const char *label, enum gpio_lookup_flags lflags, enum gpiod_flags dflags) { - struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); + struct gpio_desc *desc = gpiochip_get_desc(gc, hwnum); int ret; if (IS_ERR(desc)) { - chip_err(chip, "failed to get GPIO descriptor\n"); + chip_err(gc, "failed to get GPIO descriptor\n"); return desc; } @@ -3010,7 +3164,7 @@ struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, ret = gpiod_configure_flags(desc, label, lflags, dflags); if (ret) { - chip_err(chip, "setup of own GPIO %s failed\n", label); + chip_err(gc, "setup of own GPIO %s failed\n", label); gpiod_free_commit(desc); return ERR_PTR(ret); } @@ -3052,9 +3206,9 @@ static int gpio_do_set_config(struct gpio_chip *gc, unsigned int offset, return gc->set_config(gc, offset, config); } -static int gpio_set_config(struct gpio_chip *gc, unsigned int offset, - enum pin_config_param mode) +static int gpio_set_config(struct gpio_desc *desc, enum pin_config_param mode) { + struct gpio_chip *gc = desc->gdev->chip; unsigned long config; unsigned arg; @@ -3069,10 +3223,10 @@ static int gpio_set_config(struct gpio_chip *gc, unsigned int offset, } config = PIN_CONF_PACKED(mode, arg); - return gpio_do_set_config(gc, offset, config); + return gpio_do_set_config(gc, gpio_chip_hwgpio(desc), config); } -static int gpio_set_bias(struct gpio_chip *chip, struct gpio_desc *desc) +static int gpio_set_bias(struct gpio_desc *desc) { int bias = 0; int ret = 0; @@ -3085,7 +3239,7 @@ static int gpio_set_bias(struct gpio_chip *chip, struct gpio_desc *desc) bias = PIN_CONFIG_BIAS_PULL_DOWN; if (bias) { - ret = gpio_set_config(chip, gpio_chip_hwgpio(desc), bias); + ret = gpio_set_config(desc, bias); if (ret != -ENOTSUPP) return ret; } @@ -3103,18 +3257,18 @@ static int gpio_set_bias(struct gpio_chip *chip, struct gpio_desc *desc) */ int gpiod_direction_input(struct gpio_desc *desc) { - struct gpio_chip *chip; + struct gpio_chip *gc; int ret = 0; VALIDATE_DESC(desc); - chip = desc->gdev->chip; + gc = desc->gdev->chip; /* * It is legal to have no .get() and .direction_input() specified if * the chip is output-only, but you can't specify .direction_input() * and not support the .get() operation, that doesn't make sense. */ - if (!chip->get && chip->direction_input) { + if (!gc->get && gc->direction_input) { gpiod_warn(desc, "%s: missing get() but have direction_input()\n", __func__); @@ -3127,10 +3281,10 @@ int gpiod_direction_input(struct gpio_desc *desc) * direction (if .get_direction() is supported) else we silently * assume we are in input mode after this. */ - if (chip->direction_input) { - ret = chip->direction_input(chip, gpio_chip_hwgpio(desc)); - } else if (chip->get_direction && - (chip->get_direction(chip, gpio_chip_hwgpio(desc)) != 1)) { + if (gc->direction_input) { + ret = gc->direction_input(gc, gpio_chip_hwgpio(desc)); + } else if (gc->get_direction && + (gc->get_direction(gc, gpio_chip_hwgpio(desc)) != 1)) { gpiod_warn(desc, "%s: missing direction_input() operation and line is output\n", __func__); @@ -3138,7 +3292,7 @@ int gpiod_direction_input(struct gpio_desc *desc) } if (ret == 0) { clear_bit(FLAG_IS_OUT, &desc->flags); - ret = gpio_set_bias(chip, desc); + ret = gpio_set_bias(desc); } trace_gpio_direction(desc_to_gpio(desc), 1, ret); @@ -3222,7 +3376,6 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); */ int gpiod_direction_output(struct gpio_desc *desc, int value) { - struct gpio_chip *gc; int ret; VALIDATE_DESC(desc); @@ -3240,11 +3393,9 @@ int gpiod_direction_output(struct gpio_desc *desc, int value) return -EIO; } - gc = desc->gdev->chip; if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { /* First see if we can enable open drain in hardware */ - ret = gpio_set_config(gc, gpio_chip_hwgpio(desc), - PIN_CONFIG_DRIVE_OPEN_DRAIN); + ret = gpio_set_config(desc, PIN_CONFIG_DRIVE_OPEN_DRAIN); if (!ret) goto set_output_value; /* Emulate open drain by not actively driving the line high */ @@ -3254,8 +3405,7 @@ int gpiod_direction_output(struct gpio_desc *desc, int value) } } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { - ret = gpio_set_config(gc, gpio_chip_hwgpio(desc), - PIN_CONFIG_DRIVE_OPEN_SOURCE); + ret = gpio_set_config(desc, PIN_CONFIG_DRIVE_OPEN_SOURCE); if (!ret) goto set_output_value; /* Emulate open source by not actively driving the line low */ @@ -3264,12 +3414,11 @@ int gpiod_direction_output(struct gpio_desc *desc, int value) goto set_output_flag; } } else { - gpio_set_config(gc, gpio_chip_hwgpio(desc), - PIN_CONFIG_DRIVE_PUSH_PULL); + gpio_set_config(desc, PIN_CONFIG_DRIVE_PUSH_PULL); } set_output_value: - ret = gpio_set_bias(gc, desc); + ret = gpio_set_bias(desc); if (ret) return ret; return gpiod_direction_output_raw_commit(desc, value); @@ -3288,6 +3437,26 @@ set_output_flag: EXPORT_SYMBOL_GPL(gpiod_direction_output); /** + * gpiod_set_config - sets @config for a GPIO + * @desc: descriptor of the GPIO for which to set the configuration + * @config: Same packed config format as generic pinconf + * + * Returns: + * 0 on success, %-ENOTSUPP if the controller doesn't support setting the + * configuration. + */ +int gpiod_set_config(struct gpio_desc *desc, unsigned long config) +{ + struct gpio_chip *gc; + + VALIDATE_DESC(desc); + gc = desc->gdev->chip; + + return gpio_do_set_config(gc, gpio_chip_hwgpio(desc), config); +} +EXPORT_SYMBOL_GPL(gpiod_set_config); + +/** * gpiod_set_debounce - sets @debounce time for a GPIO * @desc: descriptor of the GPIO for which to set debounce time * @debounce: debounce time in microseconds @@ -3298,14 +3467,10 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output); */ int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) { - struct gpio_chip *chip; - unsigned long config; - - VALIDATE_DESC(desc); - chip = desc->gdev->chip; + unsigned long config; config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce); - return gpio_do_set_config(chip, gpio_chip_hwgpio(desc), config); + return gpiod_set_config(desc, config); } EXPORT_SYMBOL_GPL(gpiod_set_debounce); @@ -3319,7 +3484,7 @@ EXPORT_SYMBOL_GPL(gpiod_set_debounce); */ int gpiod_set_transitory(struct gpio_desc *desc, bool transitory) { - struct gpio_chip *chip; + struct gpio_chip *gc; unsigned long packed; int gpio; int rc; @@ -3332,14 +3497,14 @@ int gpiod_set_transitory(struct gpio_desc *desc, bool transitory) assign_bit(FLAG_TRANSITORY, &desc->flags, transitory); /* If the driver supports it, set the persistence state now */ - chip = desc->gdev->chip; - if (!chip->set_config) + gc = desc->gdev->chip; + if (!gc->set_config) return 0; packed = pinconf_to_config_packed(PIN_CONFIG_PERSIST_STATE, !transitory); gpio = gpio_chip_hwgpio(desc); - rc = gpio_do_set_config(chip, gpio, packed); + rc = gpio_do_set_config(gc, gpio, packed); if (rc == -ENOTSUPP) { dev_dbg(&desc->gdev->dev, "Persistence not supported for GPIO %d\n", gpio); @@ -3398,28 +3563,28 @@ EXPORT_SYMBOL_GPL(gpiod_toggle_active_low); static int gpiod_get_raw_value_commit(const struct gpio_desc *desc) { - struct gpio_chip *chip; + struct gpio_chip *gc; int offset; int value; - chip = desc->gdev->chip; + gc = desc->gdev->chip; offset = gpio_chip_hwgpio(desc); - value = chip->get ? chip->get(chip, offset) : -EIO; + value = gc->get ? gc->get(gc, offset) : -EIO; value = value < 0 ? value : !!value; trace_gpio_value(desc_to_gpio(desc), 1, value); return value; } -static int gpio_chip_get_multiple(struct gpio_chip *chip, +static int gpio_chip_get_multiple(struct gpio_chip *gc, unsigned long *mask, unsigned long *bits) { - if (chip->get_multiple) { - return chip->get_multiple(chip, mask, bits); - } else if (chip->get) { + if (gc->get_multiple) { + return gc->get_multiple(gc, mask, bits); + } else if (gc->get) { int i, value; - for_each_set_bit(i, mask, chip->ngpio) { - value = chip->get(chip, i); + for_each_set_bit(i, mask, gc->ngpio) { + value = gc->get(gc, i); if (value < 0) return value; __assign_bit(i, bits, value); @@ -3467,26 +3632,26 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep, } while (i < array_size) { - struct gpio_chip *chip = desc_array[i]->gdev->chip; + struct gpio_chip *gc = desc_array[i]->gdev->chip; unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; unsigned long *mask, *bits; int first, j, ret; - if (likely(chip->ngpio <= FASTPATH_NGPIO)) { + if (likely(gc->ngpio <= FASTPATH_NGPIO)) { mask = fastpath; } else { - mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), + mask = kmalloc_array(2 * BITS_TO_LONGS(gc->ngpio), sizeof(*mask), can_sleep ? GFP_KERNEL : GFP_ATOMIC); if (!mask) return -ENOMEM; } - bits = mask + BITS_TO_LONGS(chip->ngpio); - bitmap_zero(mask, chip->ngpio); + bits = mask + BITS_TO_LONGS(gc->ngpio); + bitmap_zero(mask, gc->ngpio); if (!can_sleep) - WARN_ON(chip->can_sleep); + WARN_ON(gc->can_sleep); /* collect all inputs belonging to the same chip */ first = i; @@ -3501,9 +3666,9 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep, i = find_next_zero_bit(array_info->get_mask, array_size, i); } while ((i < array_size) && - (desc_array[i]->gdev->chip == chip)); + (desc_array[i]->gdev->chip == gc)); - ret = gpio_chip_get_multiple(chip, mask, bits); + ret = gpio_chip_get_multiple(gc, mask, bits); if (ret) { if (mask != fastpath) kfree(mask); @@ -3641,13 +3806,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_array_value); static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value) { int ret = 0; - struct gpio_chip *chip = desc->gdev->chip; + struct gpio_chip *gc = desc->gdev->chip; int offset = gpio_chip_hwgpio(desc); if (value) { - ret = chip->direction_input(chip, offset); + ret = gc->direction_input(gc, offset); } else { - ret = chip->direction_output(chip, offset, 0); + ret = gc->direction_output(gc, offset, 0); if (!ret) set_bit(FLAG_IS_OUT, &desc->flags); } @@ -3666,15 +3831,15 @@ static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value) static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value) { int ret = 0; - struct gpio_chip *chip = desc->gdev->chip; + struct gpio_chip *gc = desc->gdev->chip; int offset = gpio_chip_hwgpio(desc); if (value) { - ret = chip->direction_output(chip, offset, 1); + ret = gc->direction_output(gc, offset, 1); if (!ret) set_bit(FLAG_IS_OUT, &desc->flags); } else { - ret = chip->direction_input(chip, offset); + ret = gc->direction_input(gc, offset); } trace_gpio_direction(desc_to_gpio(desc), !value, ret); if (ret < 0) @@ -3685,33 +3850,34 @@ static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value static void gpiod_set_raw_value_commit(struct gpio_desc *desc, bool value) { - struct gpio_chip *chip; + struct gpio_chip *gc; - chip = desc->gdev->chip; + gc = desc->gdev->chip; trace_gpio_value(desc_to_gpio(desc), 0, value); - chip->set(chip, gpio_chip_hwgpio(desc), value); + gc->set(gc, gpio_chip_hwgpio(desc), value); } /* * set multiple outputs on the same chip; * use the chip's set_multiple function if available; * otherwise set the outputs sequentially; + * @chip: the GPIO chip we operate on * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word * defines which outputs are to be changed * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word * defines the values the outputs specified by mask are to be set to */ -static void gpio_chip_set_multiple(struct gpio_chip *chip, +static void gpio_chip_set_multiple(struct gpio_chip *gc, unsigned long *mask, unsigned long *bits) { - if (chip->set_multiple) { - chip->set_multiple(chip, mask, bits); + if (gc->set_multiple) { + gc->set_multiple(gc, mask, bits); } else { unsigned int i; /* set outputs if the corresponding mask bit is set */ - for_each_set_bit(i, mask, chip->ngpio) - chip->set(chip, i, test_bit(i, bits)); + for_each_set_bit(i, mask, gc->ngpio) + gc->set(gc, i, test_bit(i, bits)); } } @@ -3750,26 +3916,26 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep, } while (i < array_size) { - struct gpio_chip *chip = desc_array[i]->gdev->chip; + struct gpio_chip *gc = desc_array[i]->gdev->chip; unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; unsigned long *mask, *bits; int count = 0; - if (likely(chip->ngpio <= FASTPATH_NGPIO)) { + if (likely(gc->ngpio <= FASTPATH_NGPIO)) { mask = fastpath; } else { - mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), + mask = kmalloc_array(2 * BITS_TO_LONGS(gc->ngpio), sizeof(*mask), can_sleep ? GFP_KERNEL : GFP_ATOMIC); if (!mask) return -ENOMEM; } - bits = mask + BITS_TO_LONGS(chip->ngpio); - bitmap_zero(mask, chip->ngpio); + bits = mask + BITS_TO_LONGS(gc->ngpio); + bitmap_zero(mask, gc->ngpio); if (!can_sleep) - WARN_ON(chip->can_sleep); + WARN_ON(gc->can_sleep); do { struct gpio_desc *desc = desc_array[i]; @@ -3805,10 +3971,10 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep, i = find_next_zero_bit(array_info->set_mask, array_size, i); } while ((i < array_size) && - (desc_array[i]->gdev->chip == chip)); + (desc_array[i]->gdev->chip == gc)); /* push collected bits to outputs */ if (count != 0) - gpio_chip_set_multiple(chip, mask, bits); + gpio_chip_set_multiple(gc, mask, bits); if (mask != fastpath) kfree(mask); @@ -3970,7 +4136,7 @@ EXPORT_SYMBOL_GPL(gpiod_set_consumer_name); */ int gpiod_to_irq(const struct gpio_desc *desc) { - struct gpio_chip *chip; + struct gpio_chip *gc; int offset; /* @@ -3981,10 +4147,10 @@ int gpiod_to_irq(const struct gpio_desc *desc) if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) return -EINVAL; - chip = desc->gdev->chip; + gc = desc->gdev->chip; offset = gpio_chip_hwgpio(desc); - if (chip->to_irq) { - int retirq = chip->to_irq(chip, offset); + if (gc->to_irq) { + int retirq = gc->to_irq(gc, offset); /* Zero means NO_IRQ */ if (!retirq) @@ -3998,17 +4164,17 @@ EXPORT_SYMBOL_GPL(gpiod_to_irq); /** * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ - * @chip: the chip the GPIO to lock belongs to + * @gc: the chip the GPIO to lock belongs to * @offset: the offset of the GPIO to lock as IRQ * * This is used directly by GPIO drivers that want to lock down * a certain GPIO line to be used for IRQs. */ -int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) +int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset) { struct gpio_desc *desc; - desc = gpiochip_get_desc(chip, offset); + desc = gpiochip_get_desc(gc, offset); if (IS_ERR(desc)) return PTR_ERR(desc); @@ -4016,18 +4182,18 @@ int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) * If it's fast: flush the direction setting if something changed * behind our back */ - if (!chip->can_sleep && chip->get_direction) { + if (!gc->can_sleep && gc->get_direction) { int dir = gpiod_get_direction(desc); if (dir < 0) { - chip_err(chip, "%s: cannot get GPIO direction\n", + chip_err(gc, "%s: cannot get GPIO direction\n", __func__); return dir; } } if (test_bit(FLAG_IS_OUT, &desc->flags)) { - chip_err(chip, + chip_err(gc, "%s: tried to flag a GPIO set as output for IRQ\n", __func__); return -EIO; @@ -4050,17 +4216,17 @@ EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); /** * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ - * @chip: the chip the GPIO to lock belongs to + * @gc: the chip the GPIO to lock belongs to * @offset: the offset of the GPIO to lock as IRQ * * This is used directly by GPIO drivers that want to indicate * that a certain GPIO is no longer used exclusively for IRQ. */ -void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) +void gpiochip_unlock_as_irq(struct gpio_chip *gc, unsigned int offset) { struct gpio_desc *desc; - desc = gpiochip_get_desc(chip, offset); + desc = gpiochip_get_desc(gc, offset); if (IS_ERR(desc)) return; @@ -4073,9 +4239,9 @@ void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) } EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); -void gpiochip_disable_irq(struct gpio_chip *chip, unsigned int offset) +void gpiochip_disable_irq(struct gpio_chip *gc, unsigned int offset) { - struct gpio_desc *desc = gpiochip_get_desc(chip, offset); + struct gpio_desc *desc = gpiochip_get_desc(gc, offset); if (!IS_ERR(desc) && !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) @@ -4083,9 +4249,9 @@ void gpiochip_disable_irq(struct gpio_chip *chip, unsigned int offset) } EXPORT_SYMBOL_GPL(gpiochip_disable_irq); -void gpiochip_enable_irq(struct gpio_chip *chip, unsigned int offset) +void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset) { - struct gpio_desc *desc = gpiochip_get_desc(chip, offset); + struct gpio_desc *desc = gpiochip_get_desc(gc, offset); if (!IS_ERR(desc) && !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) { @@ -4095,63 +4261,63 @@ void gpiochip_enable_irq(struct gpio_chip *chip, unsigned int offset) } EXPORT_SYMBOL_GPL(gpiochip_enable_irq); -bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) +bool gpiochip_line_is_irq(struct gpio_chip *gc, unsigned int offset) { - if (offset >= chip->ngpio) + if (offset >= gc->ngpio) return false; - return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); + return test_bit(FLAG_USED_AS_IRQ, &gc->gpiodev->descs[offset].flags); } EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); -int gpiochip_reqres_irq(struct gpio_chip *chip, unsigned int offset) +int gpiochip_reqres_irq(struct gpio_chip *gc, unsigned int offset) { int ret; - if (!try_module_get(chip->gpiodev->owner)) + if (!try_module_get(gc->gpiodev->owner)) return -ENODEV; - ret = gpiochip_lock_as_irq(chip, offset); + ret = gpiochip_lock_as_irq(gc, offset); if (ret) { - chip_err(chip, "unable to lock HW IRQ %u for IRQ\n", offset); - module_put(chip->gpiodev->owner); + chip_err(gc, "unable to lock HW IRQ %u for IRQ\n", offset); + module_put(gc->gpiodev->owner); return ret; } return 0; } EXPORT_SYMBOL_GPL(gpiochip_reqres_irq); -void gpiochip_relres_irq(struct gpio_chip *chip, unsigned int offset) +void gpiochip_relres_irq(struct gpio_chip *gc, unsigned int offset) { - gpiochip_unlock_as_irq(chip, offset); - module_put(chip->gpiodev->owner); + gpiochip_unlock_as_irq(gc, offset); + module_put(gc->gpiodev->owner); } EXPORT_SYMBOL_GPL(gpiochip_relres_irq); -bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) +bool gpiochip_line_is_open_drain(struct gpio_chip *gc, unsigned int offset) { - if (offset >= chip->ngpio) + if (offset >= gc->ngpio) return false; - return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); + return test_bit(FLAG_OPEN_DRAIN, &gc->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) +bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset) { - if (offset >= chip->ngpio) + if (offset >= gc->ngpio) return false; - return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); + return test_bit(FLAG_OPEN_SOURCE, &gc->gpiodev->descs[offset].flags); } EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); -bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset) +bool gpiochip_line_is_persistent(struct gpio_chip *gc, unsigned int offset) { - if (offset >= chip->ngpio) + if (offset >= gc->ngpio) return false; - return !test_bit(FLAG_TRANSITORY, &chip->gpiodev->descs[offset].flags); + return !test_bit(FLAG_TRANSITORY, &gc->gpiodev->descs[offset].flags); } EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent); @@ -4389,7 +4555,7 @@ EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table); */ void gpiod_add_hogs(struct gpiod_hog *hogs) { - struct gpio_chip *chip; + struct gpio_chip *gc; struct gpiod_hog *hog; mutex_lock(&gpio_machine_hogs_mutex); @@ -4401,9 +4567,9 @@ void gpiod_add_hogs(struct gpiod_hog *hogs) * The chip may have been registered earlier, so check if it * exists and, if so, try to hog the line now. */ - chip = find_chip_by_name(hog->chip_label); - if (chip) - gpiochip_machine_hog(chip, hog); + gc = find_chip_by_name(hog->chip_label); + if (gc) + gpiochip_machine_hog(gc, hog); } mutex_unlock(&gpio_machine_hogs_mutex); @@ -4453,7 +4619,7 @@ static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, return desc; for (p = &table->table[0]; p->chip_label; p++) { - struct gpio_chip *chip; + struct gpio_chip *gc; /* idx must always match exactly */ if (p->idx != idx) @@ -4463,9 +4629,9 @@ static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) continue; - chip = find_chip_by_name(p->chip_label); + gc = find_chip_by_name(p->chip_label); - if (!chip) { + if (!gc) { /* * As the lookup table indicates a chip with * p->chip_label should exist, assume it may @@ -4478,15 +4644,15 @@ static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, return ERR_PTR(-EPROBE_DEFER); } - if (chip->ngpio <= p->chip_hwnum) { + if (gc->ngpio <= p->chip_hwnum) { dev_err(dev, "requested GPIO %u (%u) is out of range [0..%u] for chip %s\n", - idx, p->chip_hwnum, chip->ngpio - 1, - chip->label); + idx, p->chip_hwnum, gc->ngpio - 1, + gc->label); return ERR_PTR(-EINVAL); } - desc = gpiochip_get_desc(chip, p->chip_hwnum); + desc = gpiochip_get_desc(gc, p->chip_hwnum); *flags = p->flags; return desc; @@ -4881,20 +5047,20 @@ EXPORT_SYMBOL_GPL(gpiod_get_index_optional); int gpiod_hog(struct gpio_desc *desc, const char *name, unsigned long lflags, enum gpiod_flags dflags) { - struct gpio_chip *chip; + struct gpio_chip *gc; struct gpio_desc *local_desc; int hwnum; int ret; - chip = gpiod_to_chip(desc); + gc = gpiod_to_chip(desc); hwnum = gpio_chip_hwgpio(desc); - local_desc = gpiochip_request_own_desc(chip, hwnum, name, + local_desc = gpiochip_request_own_desc(gc, hwnum, name, lflags, dflags); if (IS_ERR(local_desc)) { ret = PTR_ERR(local_desc); pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", - name, chip->label, hwnum, ret); + name, gc->label, hwnum, ret); return ret; } @@ -4912,15 +5078,15 @@ int gpiod_hog(struct gpio_desc *desc, const char *name, /** * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog - * @chip: gpio chip to act on + * @gc: gpio chip to act on */ -static void gpiochip_free_hogs(struct gpio_chip *chip) +static void gpiochip_free_hogs(struct gpio_chip *gc) { int id; - for (id = 0; id < chip->ngpio; id++) { - if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) - gpiochip_free_own_desc(&chip->gpiodev->descs[id]); + for (id = 0; id < gc->ngpio; id++) { + if (test_bit(FLAG_IS_HOGGED, &gc->gpiodev->descs[id].flags)) + gpiochip_free_own_desc(&gc->gpiodev->descs[id]); } } @@ -4943,7 +5109,7 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev, struct gpio_desc *desc; struct gpio_descs *descs; struct gpio_array *array_info = NULL; - struct gpio_chip *chip; + struct gpio_chip *gc; int count, bitmap_size; count = gpiod_count(dev, con_id); @@ -4963,7 +5129,7 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev, descs->desc[descs->ndescs] = desc; - chip = gpiod_to_chip(desc); + gc = gpiod_to_chip(desc); /* * If pin hardware number of array member 0 is also 0, select * its chip as a candidate for fast bitmap processing path. @@ -4971,8 +5137,8 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev, if (descs->ndescs == 0 && gpio_chip_hwgpio(desc) == 0) { struct gpio_descs *array; - bitmap_size = BITS_TO_LONGS(chip->ngpio > count ? - chip->ngpio : count); + bitmap_size = BITS_TO_LONGS(gc->ngpio > count ? + gc->ngpio : count); array = kzalloc(struct_size(descs, desc, count) + struct_size(array_info, invert_mask, @@ -4995,7 +5161,7 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev, array_info->desc = descs->desc; array_info->size = count; - array_info->chip = chip; + array_info->chip = gc; bitmap_set(array_info->get_mask, descs->ndescs, count - descs->ndescs); bitmap_set(array_info->set_mask, descs->ndescs, @@ -5003,7 +5169,7 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev, descs->info = array_info; } /* Unmark array members which don't belong to the 'fast' chip */ - if (array_info && array_info->chip != chip) { + if (array_info && array_info->chip != gc) { __clear_bit(descs->ndescs, array_info->get_mask); __clear_bit(descs->ndescs, array_info->set_mask); } @@ -5028,8 +5194,8 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev, } } else if (array_info) { /* Exclude open drain or open source from fast output */ - if (gpiochip_line_is_open_drain(chip, descs->ndescs) || - gpiochip_line_is_open_source(chip, descs->ndescs)) + if (gpiochip_line_is_open_drain(gc, descs->ndescs) || + gpiochip_line_is_open_source(gc, descs->ndescs)) __clear_bit(descs->ndescs, array_info->set_mask); /* Identify 'fast' pins which require invertion */ @@ -5117,10 +5283,15 @@ static int __init gpiolib_dev_init(void) 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; } + + gpiolib_initialized = true; + gpiochip_setup_devs(); + + if (IS_ENABLED(CONFIG_OF_DYNAMIC)) + WARN_ON(of_reconfig_notifier_register(&gpio_of_notifier)); + return ret; } core_initcall(gpiolib_dev_init); @@ -5130,7 +5301,7 @@ core_initcall(gpiolib_dev_init); static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) { unsigned i; - struct gpio_chip *chip = gdev->chip; + struct gpio_chip *gc = gdev->chip; unsigned gpio = gdev->base; struct gpio_desc *gdesc = &gdev->descs[0]; bool is_out; @@ -5153,7 +5324,7 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s%s", gpio, gdesc->name ? gdesc->name : "", gdesc->label, is_out ? "out" : "in ", - chip->get ? (chip->get(chip, i) ? "hi" : "lo") : "? ", + gc->get ? (gc->get(gc, i) ? "hi" : "lo") : "? ", is_irq ? "IRQ " : "", active_low ? "ACTIVE LOW" : ""); seq_printf(s, "\n"); @@ -5205,10 +5376,10 @@ static void gpiolib_seq_stop(struct seq_file *s, void *v) static int gpiolib_seq_show(struct seq_file *s, void *v) { struct gpio_device *gdev = v; - struct gpio_chip *chip = gdev->chip; + struct gpio_chip *gc = gdev->chip; struct device *parent; - if (!chip) { + if (!gc) { seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, dev_name(&gdev->dev)); return 0; @@ -5217,19 +5388,19 @@ static int gpiolib_seq_show(struct seq_file *s, void *v) 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; + parent = gc->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) + if (gc->label) + seq_printf(s, ", %s", gc->label); + if (gc->can_sleep) seq_printf(s, ", can sleep"); seq_printf(s, ":\n"); - if (chip->dbg_show) - chip->dbg_show(s, chip); + if (gc->dbg_show) + gc->dbg_show(s, gc); else gpiolib_dbg_show(s, gdev); |