From: Daniel Scally <djrscally@gmail.com>
To: "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Daniel Scally <djrscally@gmail.com>,
Wolfram Sang <wsa@kernel.org>, Lee Jones <lee.jones@linaro.org>,
Hans de Goede <hdegoede@redhat.com>,
Maximilian Luz <luzmaximilian@gmail.com>,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org,
linux-i2c@vger.kernel.org, platform-driver-x86@vger.kernel.org,
devel@acpica.org
Cc: Len Brown <lenb@kernel.org>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Russell King <linux@armlinux.org.uk>,
Linus Walleij <linus.walleij@linaro.org>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
Mark Gross <mgross@linux.intel.com>,
Robert Moore <robert.moore@intel.com>,
Erik Kaneda <erik.kaneda@intel.com>,
laurent.pinchart@ideasonboard.com,
kieran.bingham@ideasonboard.com,
Andy Shevchenko <andy.shevchenko@gmail.com>
Subject: [PATCH v4 2/8] ACPI: scan: Add function to fetch dependent of acpi device
Date: Thu, 20 May 2021 15:09:22 +0100 [thread overview]
Message-ID: <20210520140928.3252671-3-djrscally@gmail.com> (raw)
In-Reply-To: <20210520140928.3252671-1-djrscally@gmail.com>
In some ACPI tables we encounter, devices use the _DEP method to assert
a dependence on other ACPI devices as opposed to the OpRegions that the
specification intends. We need to be able to find those devices "from"
the dependee, so add a callback and a wrapper to walk over the
acpi_dep_list and return the dependent ACPI device.
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
Changes since v3:
Both new functions were renamed.
drivers/acpi/scan.c | 38 ++++++++++++++++++++++++++++++++++++++
include/acpi/acpi_bus.h | 1 +
2 files changed, 39 insertions(+)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 195635c3462b..1a76fbdfa669 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -2105,6 +2105,21 @@ static void acpi_bus_attach(struct acpi_device *device, bool first_pass)
device->handler->hotplug.notify_online(device);
}
+static int acpi_return_dep_dev(struct acpi_dep_data *dep, void *data)
+{
+ struct acpi_device *adev;
+ int ret;
+
+ ret = acpi_bus_get_device(dep->consumer, &adev);
+ if (ret)
+ /* If we don't find an adev then we want to continue parsing */
+ return 0;
+
+ *(struct acpi_device **)data = adev;
+
+ return 1;
+}
+
static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
{
struct acpi_device *adev;
@@ -2168,6 +2183,29 @@ void acpi_dev_clear_dependencies(struct acpi_device *supplier)
}
EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
+/**
+ * acpi_dev_get_dependent_dev - Return ACPI device dependent on @supplier
+ * @supplier: Pointer to the dependee device
+ *
+ * Returns the first &struct acpi_device which declares itself dependent on
+ * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
+ *
+ * The caller is responsible for putting the reference to adev when it is no
+ * longer needed.
+ */
+struct acpi_device *acpi_dev_get_dependent_dev(struct acpi_device *supplier)
+{
+ struct acpi_device *adev = NULL;
+
+ acpi_walk_dep_device_list(supplier->handle, acpi_return_dep_dev, &adev);
+
+ if (adev)
+ get_device(&adev->dev);
+
+ return adev;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_get_dependent_dev);
+
/**
* acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
* @handle: Root of the namespace scope to scan.
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 0b2c4f170f4d..68d378207704 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -692,6 +692,7 @@ static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
bool acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *uid2);
void acpi_dev_clear_dependencies(struct acpi_device *supplier);
+struct acpi_device *acpi_dev_get_dependent_dev(struct acpi_device *supplier);
struct acpi_device *
acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv);
struct acpi_device *
--
2.25.1
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next prev parent reply other threads:[~2021-05-20 14:12 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-20 14:09 [PATCH v4 0/8] Introduce intel_skl_int3472 module Daniel Scally
2021-05-20 14:09 ` [PATCH v4 1/8] ACPI: scan: Extend acpi_walk_dep_device_list() Daniel Scally
2021-05-20 17:15 ` Maximilian Luz
2021-05-20 18:22 ` Rafael J. Wysocki
2021-05-20 21:03 ` Hans de Goede
2021-05-21 12:59 ` Andy Shevchenko
2021-05-20 14:09 ` Daniel Scally [this message]
2021-05-20 18:33 ` [PATCH v4 2/8] ACPI: scan: Add function to fetch dependent of acpi device Rafael J. Wysocki
2021-05-20 18:55 ` Rafael J. Wysocki
2021-05-21 19:25 ` Daniel Scally
2021-05-20 14:09 ` [PATCH v4 3/8] i2c: core: Add a format macro for I2C device names Daniel Scally
2021-05-20 14:09 ` [PATCH v4 4/8] gpiolib: acpi: Export acpi_get_gpiod() Daniel Scally
2021-05-20 14:09 ` [PATCH v4 5/8] clkdev: Make clkdev_drop() null aware Daniel Scally
2021-05-20 14:09 ` [PATCH v4 6/8] gpiolib: acpi: Add acpi_gpio_get_io_resource() Daniel Scally
2021-05-21 12:05 ` Andy Shevchenko
2021-05-25 22:30 ` Daniel Scally
2021-05-20 14:09 ` [PATCH v4 7/8] platform/x86: Add intel_skl_int3472 driver Daniel Scally
2021-05-21 12:57 ` Andy Shevchenko
2021-05-25 22:53 ` Daniel Scally
2021-05-26 7:54 ` Andy Shevchenko
2021-05-20 14:09 ` [PATCH v4 8/8] mfd: tps68470: Remove tps68470 MFD driver Daniel Scally
2021-05-25 13:10 ` [PATCH v4 0/8] Introduce intel_skl_int3472 module Hans de Goede
2021-05-25 13:12 ` Hans de Goede
2021-05-25 13:23 ` Andy Shevchenko
2021-05-25 23:03 ` Daniel Scally
2021-05-26 7:55 ` Andy Shevchenko
2021-05-26 12:36 ` Hans de Goede
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