From 63b19547cc3d96041d7bc7ab8de6292b0ebaf2c9 Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Sun, 23 Jul 2017 17:25:43 +0100 Subject: [PATCH] iio: Use macro magic to avoid manual assign of driver_module Starting point in boiler plate reduction similar to that done for many similar cases elsewhere in the kernel. Signed-off-by: Jonathan Cameron Reviewed-by: Lars-Peter Clausen --- drivers/iio/industrialio-core.c | 35 +++++++++-------------------------- drivers/iio/industrialio-trigger.c | 6 +++--- include/linux/iio/iio.h | 31 +++++++++++++++++++++++++++++-- 3 files changed, 41 insertions(+), 31 deletions(-) diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 17ec4ce..7a5aa12 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -1660,14 +1660,11 @@ static int iio_check_unique_scan_index(struct iio_dev *indio_dev) static const struct iio_buffer_setup_ops noop_ring_setup_ops; -/** - * iio_device_register() - register a device with the IIO subsystem - * @indio_dev: Device structure filled by the device driver - **/ -int iio_device_register(struct iio_dev *indio_dev) +int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod) { int ret; + indio_dev->driver_module = this_mod; /* If the calling driver did not initialize of_node, do it here */ if (!indio_dev->dev.of_node && indio_dev->dev.parent) indio_dev->dev.of_node = indio_dev->dev.parent->of_node; @@ -1713,7 +1710,8 @@ int iio_device_register(struct iio_dev *indio_dev) indio_dev->setup_ops = &noop_ring_setup_ops; cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); - indio_dev->chrdev.owner = indio_dev->info->driver_module; + + indio_dev->chrdev.owner = this_mod; ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev); if (ret < 0) @@ -1731,7 +1729,7 @@ error_unreg_debugfs: iio_device_unregister_debugfs(indio_dev); return ret; } -EXPORT_SYMBOL(iio_device_register); +EXPORT_SYMBOL(__iio_device_register); /** * iio_device_unregister() - unregister a device from the IIO subsystem @@ -1763,23 +1761,8 @@ static void devm_iio_device_unreg(struct device *dev, void *res) iio_device_unregister(*(struct iio_dev **)res); } -/** - * devm_iio_device_register - Resource-managed iio_device_register() - * @dev: Device to allocate iio_dev for - * @indio_dev: Device structure filled by the device driver - * - * Managed iio_device_register. The IIO device registered with this - * function is automatically unregistered on driver detach. This function - * calls iio_device_register() internally. Refer to that function for more - * information. - * - * If an iio_dev registered with this function needs to be unregistered - * separately, devm_iio_device_unregister() must be used. - * - * RETURNS: - * 0 on success, negative error number on failure. - */ -int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) +int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, + struct module *this_mod) { struct iio_dev **ptr; int ret; @@ -1789,7 +1772,7 @@ int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) return -ENOMEM; *ptr = indio_dev; - ret = iio_device_register(indio_dev); + ret = __iio_device_register(indio_dev, this_mod); if (!ret) devres_add(dev, ptr); else @@ -1797,7 +1780,7 @@ int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) return ret; } -EXPORT_SYMBOL_GPL(devm_iio_device_register); +EXPORT_SYMBOL_GPL(__devm_iio_device_register); /** * devm_iio_device_unregister - Resource-managed iio_device_unregister() diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c index 4061fed..9596fed 100644 --- a/drivers/iio/industrialio-trigger.c +++ b/drivers/iio/industrialio-trigger.c @@ -250,7 +250,7 @@ static int iio_trigger_attach_poll_func(struct iio_trigger *trig, = bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER); /* Prevent the module from being removed whilst attached to a trigger */ - __module_get(pf->indio_dev->info->driver_module); + __module_get(pf->indio_dev->driver_module); /* Get irq number */ pf->irq = iio_trigger_get_irq(trig); @@ -286,7 +286,7 @@ out_free_irq: out_put_irq: iio_trigger_put_irq(trig, pf->irq); out_put_module: - module_put(pf->indio_dev->info->driver_module); + module_put(pf->indio_dev->driver_module); return ret; } @@ -307,7 +307,7 @@ static int iio_trigger_detach_poll_func(struct iio_trigger *trig, trig->attached_own_device = false; iio_trigger_put_irq(trig, pf->irq); free_irq(pf->irq, pf); - module_put(pf->indio_dev->info->driver_module); + module_put(pf->indio_dev->driver_module); return ret; } diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h index d68bec2..97a0143 100644 --- a/include/linux/iio/iio.h +++ b/include/linux/iio/iio.h @@ -518,6 +518,7 @@ struct iio_buffer_setup_ops { /** * struct iio_dev - industrial I/O device * @id: [INTERN] used to identify device internally + * @driver_module: [INTERN] used to make it harder to undercut users * @modes: [DRIVER] operating modes supported by device * @currentmode: [DRIVER] current operating mode * @dev: [DRIVER] device structure, should be assigned a parent @@ -558,6 +559,7 @@ struct iio_buffer_setup_ops { */ struct iio_dev { int id; + struct module *driver_module; int modes; int currentmode; @@ -604,9 +606,34 @@ struct iio_dev { const struct iio_chan_spec *iio_find_channel_from_si(struct iio_dev *indio_dev, int si); -int iio_device_register(struct iio_dev *indio_dev); +/** + * iio_device_register() - register a device with the IIO subsystem + * @indio_dev: Device structure filled by the device driver + **/ +#define iio_device_register(iio_dev) \ + __iio_device_register((iio_dev), THIS_MODULE) +int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod); void iio_device_unregister(struct iio_dev *indio_dev); -int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev); +/** + * devm_iio_device_register - Resource-managed iio_device_register() + * @dev: Device to allocate iio_dev for + * @indio_dev: Device structure filled by the device driver + * + * Managed iio_device_register. The IIO device registered with this + * function is automatically unregistered on driver detach. This function + * calls iio_device_register() internally. Refer to that function for more + * information. + * + * If an iio_dev registered with this function needs to be unregistered + * separately, devm_iio_device_unregister() must be used. + * + * RETURNS: + * 0 on success, negative error number on failure. + */ +#define devm_iio_device_register(dev, indio_dev) \ + __devm_iio_device_register((dev), (indio_dev), THIS_MODULE); +int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, + struct module *this_mod); void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev); int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp); int iio_device_claim_direct_mode(struct iio_dev *indio_dev); -- 2.7.4