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SubjectRe: [PATCH 3/3] i2c / ACPI: add ACPI enumeration support
On Sat, Nov 3, 2012 at 7:46 AM, Mika Westerberg
<mika.westerberg@linux.intel.com> wrote:
> ACPI 5 introduced I2cSerialBus resource that makes it possible to enumerate
> and configure the I2C slave devices behind the I2C controller. This patch
> adds helper functions to support I2C slave enumeration.
>
> An ACPI enabled I2C controller driver only needs to call acpi_i2c_register_devices()
> in order to get its slave devices enumerated, created and bound to the
> corresponding ACPI handle.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
> drivers/acpi/Kconfig | 6 ++
> drivers/acpi/Makefile | 1 +
> drivers/acpi/acpi_i2c.c | 234 ++++++++++++++++++++++++++++++++++++++++++++++
> drivers/i2c/i2c-core.c | 9 ++
> include/linux/acpi_i2c.h | 29 ++++++
> 5 files changed, 279 insertions(+)
> create mode 100644 drivers/acpi/acpi_i2c.c
> create mode 100644 include/linux/acpi_i2c.h
>
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index 119d58d..0300bf6 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -181,6 +181,12 @@ config ACPI_DOCK
> This driver supports ACPI-controlled docking stations and removable
> drive bays such as the IBM Ultrabay and the Dell Module Bay.
>
> +config ACPI_I2C
> + def_tristate I2C
> + depends on I2C
> + help
> + ACPI I2C enumeration support.
> +
> config ACPI_PROCESSOR
> tristate "Processor"
> select THERMAL
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index a7badb5..8573346 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -69,6 +69,7 @@ obj-$(CONFIG_ACPI_HED) += hed.o
> obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o
> obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o
> obj-$(CONFIG_ACPI_BGRT) += bgrt.o
> +obj-$(CONFIG_ACPI_I2C) += acpi_i2c.o
>
> # processor has its own "processor." module_param namespace
> processor-y := processor_driver.o processor_throttling.o
> diff --git a/drivers/acpi/acpi_i2c.c b/drivers/acpi/acpi_i2c.c
> new file mode 100644
> index 0000000..dc6997e
> --- /dev/null
> +++ b/drivers/acpi/acpi_i2c.c
> @@ -0,0 +1,234 @@
> +/*
> + * ACPI I2C enumeration support
> + *
> + * Copyright (C) 2012, Intel Corporation
> + * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +
> +struct acpi_i2c {
> + acpi_status (*callback)(struct acpi_device *, void *);
> + void *data;
> +};
> +
> +static acpi_status acpi_i2c_enumerate_device(acpi_handle handle, u32 level,
> + void *data, void **return_value)
> +{
> + struct acpi_i2c *acpi_i2c = data;
> + struct acpi_device *adev;
> +
> + if (acpi_bus_get_device(handle, &adev))
> + return AE_OK;
> + if (acpi_bus_get_status(adev) || !adev->status.present)
> + return AE_OK;
> +
> + return acpi_i2c->callback(adev, acpi_i2c->data);
> +}
> +
> +static acpi_status acpi_i2c_enumerate(acpi_handle handle,
> + acpi_status (*callback)(struct acpi_device *, void *), void *data)
> +{
> + struct acpi_i2c acpi_i2c;
> +
> + acpi_i2c.callback = callback;
> + acpi_i2c.data = data;
> +
> + return acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
> + acpi_i2c_enumerate_device, NULL,
> + &acpi_i2c, NULL);
> +}

Same comment here as for the SPI patch. The two levels of indirection
is more convoluted than it needs to be. Can acpi_i2c_find_client and
acpi_i2c_add_device be passed directly to acpi_walk_namespace?

g.


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