linux-kernel - [PATCH 11/15] i2c: core: Allow getting ACPI info by index

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Message-Id: <20170317095527.10487-12-hdegoede@redhat.com>
Date:   Fri, 17 Mar 2017 10:55:23 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Wolfram Sang <wsa@...-dreams.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Lee Jones <lee.jones@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Cc:     Hans de Goede <hdegoede@...hat.com>, linux-acpi@...r.kernel.org,
        Takashi Iwai <tiwai@...e.de>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: [PATCH 11/15] i2c: core: Allow getting ACPI info by index

Modify struct i2c_acpi_lookup and i2c_acpi_fill_info() to allow
using them to get the info from a certain index in the ACPI-resource
list rather then taking the first I2cSerialBus resource.

Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
 drivers/i2c/i2c-core.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index d2402bb..32b58fb 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -112,6 +112,8 @@ struct i2c_acpi_lookup {
 	acpi_handle adapter_handle;
 	acpi_handle device_handle;
 	acpi_handle search_handle;
+	int n;
+	int index;
 	u32 speed;
 	u32 min_speed;
 };
@@ -123,6 +125,9 @@ static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data)
 	struct acpi_resource_i2c_serialbus *sb;
 	acpi_status status;
 
+	if (lookup->index != -1 && lookup->n++ != lookup->index)
+		return 1;
+
 	if (info->addr || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
 		return 1;
 
@@ -182,6 +187,7 @@ static int i2c_acpi_get_info(struct acpi_device *adev,
 
 	memset(&lookup, 0, sizeof(lookup));
 	lookup.info = info;
+	lookup.index = -1;
 
 	ret = i2c_acpi_do_lookup(adev, &lookup);
 	if (ret)
@@ -328,6 +334,7 @@ u32 i2c_acpi_find_bus_speed(struct device *dev)
 	lookup.search_handle = ACPI_HANDLE(dev);
 	lookup.min_speed = UINT_MAX;
 	lookup.info = &dummy;
+	lookup.index = -1;
 
 	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 				     I2C_ACPI_MAX_SCAN_DEPTH,
-- 
2.9.3