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Date: Sat, 6 Jun 2020 16:24:21 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<johan@...nel.org>, <andy.shevchenko@...il.com>
Subject: Re: [PATCH v2 1/6] iio: core: pass parent device as parameter
during allocation
On Wed, 3 Jun 2020 14:40:18 +0300
Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:
> The change passes the parent device to the iio_device_alloc() call. This
> also updates the devm_iio_device_alloc() call to consider the device object
> as the parent device by default.
>
> Having it passed like this, should ensure that any IIO device object
> already has a device object as parent, allowing for neater control, like
> passing the 'indio_dev' object for other stuff [like buffers/triggers/etc],
> and potentially creating iiom_xxx(indio_dev) functions.
>
> With this patch, only the 'drivers/platform/x86/toshiba_acpi.c' needs an
> update to pass the parent object as a parameter.
>
> In the next patch all devm_iio_device_alloc() calls will be handled.
>
> Acked-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
Applied to the togreg branch of iio.git and pushed out as testing
for the all the usual reasons.
Hmm. I should probably clear out that bit of docs that is left in staging.
I'd imagine they have rotted pretty badly and our main docs are probably
more useful.
Thanks,
Jonathan
> ---
> drivers/iio/dummy/iio_simple_dummy.c | 14 ++++++++------
> drivers/iio/industrialio-core.c | 11 ++++++-----
> drivers/platform/x86/toshiba_acpi.c | 3 +--
> drivers/staging/iio/Documentation/device.txt | 4 +---
> include/linux/iio/iio.h | 4 ++--
> 5 files changed, 18 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/iio/dummy/iio_simple_dummy.c b/drivers/iio/dummy/iio_simple_dummy.c
> index 6cb02299a215..b35ae7c039f7 100644
> --- a/drivers/iio/dummy/iio_simple_dummy.c
> +++ b/drivers/iio/dummy/iio_simple_dummy.c
> @@ -566,6 +566,13 @@ static struct iio_sw_device *iio_dummy_probe(const char *name)
> struct iio_dev *indio_dev;
> struct iio_dummy_state *st;
> struct iio_sw_device *swd;
> + struct device *parent = NULL;
> +
> + /*
> + * With hardware: Set the parent device.
> + * parent = &spi->dev;
> + * parent = &client->dev;
> + */
>
> swd = kzalloc(sizeof(*swd), GFP_KERNEL);
> if (!swd) {
> @@ -580,7 +587,7 @@ static struct iio_sw_device *iio_dummy_probe(const char *name)
> * It also has a region (accessed by iio_priv()
> * for chip specific state information.
> */
> - indio_dev = iio_device_alloc(sizeof(*st));
> + indio_dev = iio_device_alloc(parent, sizeof(*st));
> if (!indio_dev) {
> ret = -ENOMEM;
> goto error_ret;
> @@ -590,11 +597,6 @@ static struct iio_sw_device *iio_dummy_probe(const char *name)
> mutex_init(&st->lock);
>
> iio_dummy_init_device(indio_dev);
> - /*
> - * With hardware: Set the parent device.
> - * indio_dev->dev.parent = &spi->dev;
> - * indio_dev->dev.parent = &client->dev;
> - */
>
> /*
> * Make the iio_dev struct available to remove function.
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 1527f01a44f1..75661661aaba 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -1493,7 +1493,7 @@ struct device_type iio_device_type = {
> * iio_device_alloc() - allocate an iio_dev from a driver
> * @sizeof_priv: Space to allocate for private structure.
> **/
> -struct iio_dev *iio_device_alloc(int sizeof_priv)
> +struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
> {
> struct iio_dev *dev;
> size_t alloc_size;
> @@ -1510,6 +1510,7 @@ struct iio_dev *iio_device_alloc(int sizeof_priv)
> if (!dev)
> return NULL;
>
> + dev->dev.parent = parent;
> dev->dev.groups = dev->groups;
> dev->dev.type = &iio_device_type;
> dev->dev.bus = &iio_bus_type;
> @@ -1551,7 +1552,7 @@ static void devm_iio_device_release(struct device *dev, void *res)
>
> /**
> * devm_iio_device_alloc - Resource-managed iio_device_alloc()
> - * @dev: Device to allocate iio_dev for
> + * @parent: Device to allocate iio_dev for, and parent for this IIO device
> * @sizeof_priv: Space to allocate for private structure.
> *
> * Managed iio_device_alloc. iio_dev allocated with this function is
> @@ -1560,7 +1561,7 @@ static void devm_iio_device_release(struct device *dev, void *res)
> * RETURNS:
> * Pointer to allocated iio_dev on success, NULL on failure.
> */
> -struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
> +struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv)
> {
> struct iio_dev **ptr, *iio_dev;
>
> @@ -1569,10 +1570,10 @@ struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
> if (!ptr)
> return NULL;
>
> - iio_dev = iio_device_alloc(sizeof_priv);
> + iio_dev = iio_device_alloc(parent, sizeof_priv);
> if (iio_dev) {
> *ptr = iio_dev;
> - devres_add(dev, ptr);
> + devres_add(parent, ptr);
> } else {
> devres_free(ptr);
> }
> diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
> index 808944546739..4a4d09c352dd 100644
> --- a/drivers/platform/x86/toshiba_acpi.c
> +++ b/drivers/platform/x86/toshiba_acpi.c
> @@ -3128,7 +3128,7 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
>
> toshiba_accelerometer_available(dev);
> if (dev->accelerometer_supported) {
> - dev->indio_dev = iio_device_alloc(sizeof(*dev));
> + dev->indio_dev = iio_device_alloc(&acpi_dev->dev, sizeof(*dev));
> if (!dev->indio_dev) {
> pr_err("Unable to allocate iio device\n");
> goto iio_error;
> @@ -3138,7 +3138,6 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
>
> dev->indio_dev->info = &toshiba_iio_accel_info;
> dev->indio_dev->name = "Toshiba accelerometer";
> - dev->indio_dev->dev.parent = &acpi_dev->dev;
> dev->indio_dev->modes = INDIO_DIRECT_MODE;
> dev->indio_dev->channels = toshiba_iio_accel_channels;
> dev->indio_dev->num_channels =
> diff --git a/drivers/staging/iio/Documentation/device.txt b/drivers/staging/iio/Documentation/device.txt
> index ec42544a46aa..0d1275b1eb3f 100644
> --- a/drivers/staging/iio/Documentation/device.txt
> +++ b/drivers/staging/iio/Documentation/device.txt
> @@ -8,7 +8,7 @@ The crucial structure for device drivers in iio is iio_dev.
>
> First allocate one using:
>
> -struct iio_dev *indio_dev = iio_device_alloc(sizeof(struct chip_state));
> +struct iio_dev *indio_dev = iio_device_alloc(parent, sizeof(struct chip_state));
> where chip_state is a structure of local state data for this instance of
> the chip.
>
> @@ -16,8 +16,6 @@ That data can be accessed using iio_priv(struct iio_dev *).
>
> Then fill in the following:
>
> -- indio_dev->dev.parent
> - Struct device associated with the underlying hardware.
> - indio_dev->name
> Name of the device being driven - made available as the name
> attribute in sysfs.
> diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
> index a1be82e74c93..91a69f4751aa 100644
> --- a/include/linux/iio/iio.h
> +++ b/include/linux/iio/iio.h
> @@ -676,7 +676,7 @@ static inline void *iio_device_get_drvdata(struct iio_dev *indio_dev)
>
> /* Can we make this smaller? */
> #define IIO_ALIGN L1_CACHE_BYTES
> -struct iio_dev *iio_device_alloc(int sizeof_priv);
> +struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv);
>
> static inline void *iio_priv(const struct iio_dev *indio_dev)
> {
> @@ -690,7 +690,7 @@ static inline struct iio_dev *iio_priv_to_dev(void *priv)
> }
>
> void iio_device_free(struct iio_dev *indio_dev);
> -struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv);
> +struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv);
> struct iio_trigger *devm_iio_trigger_alloc(struct device *dev,
> const char *fmt, ...);
> /**
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