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SubjectRe: [PATCH 3/3] i2c / ACPI: add ACPI enumeration support
On Thu, Nov 08, 2012 at 06:58:47PM +0000, Grant Likely wrote:
> 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?

Yes they can, I'll do that in the next version. Thanks.


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