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Date: Wed, 7 May 2014 15:08:10 -0500
From: Mario Limonciello <mario_limonciello@...l.com>
To: matthew.garrett@...ula.com
Cc: LKML <linux-kernel@...r.kernel.org>,
platform-driver-x86@...r.kernel.org,
Mario Limonciello <mario_limonciello@...l.com>
Subject: [PATCH 2/2] alienware-wmi: For WMAX HDMI method, introduce a way to query HDMI cable status
Since there are now multiple HDMI attributes associated with the WMAX method,
create a sysfs group for them instead.
Signed-off-by: Mario Limonciello <mario_limonciello@...l.com>
---
drivers/platform/x86/alienware-wmi.c | 116 +++++++++++++++++++++++++---------
1 file changed, 86 insertions(+), 30 deletions(-)
diff --git a/drivers/platform/x86/alienware-wmi.c b/drivers/platform/x86/alienware-wmi.c
index e5329ea..3b175b1 100644
--- a/drivers/platform/x86/alienware-wmi.c
+++ b/drivers/platform/x86/alienware-wmi.c
@@ -32,6 +32,7 @@
#define WMAX_METHOD_HDMI_STATUS 0x2
#define WMAX_METHOD_BRIGHTNESS 0x3
#define WMAX_METHOD_ZONE_CONTROL 0x4
+#define WMAX_METHOD_HDMI_CABLE 0x5
MODULE_AUTHOR("Mario Limonciello <mario_limonciello@...l.com>");
MODULE_DESCRIPTION("Alienware special feature control");
@@ -422,41 +423,84 @@ static void alienware_zone_exit(struct platform_device *dev)
The HDMI mux sysfs node indicates the status of the HDMI input mux.
It can toggle between standard system GPU output and HDMI input.
*/
-static ssize_t show_hdmi(struct device *dev, struct device_attribute *attr,
- char *buf)
+static acpi_status alienware_hdmi_command(struct hdmi_args *in_args,
+ u32 command, int *out_data)
{
acpi_status status;
- struct acpi_buffer input;
union acpi_object *obj;
- u32 tmp = 0;
- struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct acpi_buffer input;
+ struct acpi_buffer output;
+ input.length = (acpi_size) sizeof(*in_args);
+ input.pointer = in_args;
+ if (out_data != NULL) {
+ output.length = ACPI_ALLOCATE_BUFFER;
+ output.pointer = NULL;
+ status = wmi_evaluate_method(WMAX_CONTROL_GUID, 1,
+ command, &input, &output);
+ } else
+ status = wmi_evaluate_method(WMAX_CONTROL_GUID, 1,
+ command, &input, NULL);
+
+ if (ACPI_SUCCESS(status) && out_data != NULL) {
+ obj = (union acpi_object *)output.pointer;
+ if (obj && obj->type == ACPI_TYPE_INTEGER)
+ *out_data = (u32) obj->integer.value;
+ }
+ return status;
+
+}
+
+static ssize_t show_hdmi_cable(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ acpi_status status;
+ u32 out_data;
struct hdmi_args in_args = {
.arg = 0,
};
- input.length = (acpi_size) sizeof(in_args);
- input.pointer = &in_args;
- status = wmi_evaluate_method(WMAX_CONTROL_GUID, 1,
- WMAX_METHOD_HDMI_STATUS, &input, &output);
+ status =
+ alienware_hdmi_command(&in_args, WMAX_METHOD_HDMI_CABLE,
+ (u32 *) &out_data);
+ if (ACPI_SUCCESS(status)) {
+ if (out_data == 0)
+ return scnprintf(buf, PAGE_SIZE,
+ "[unconnected] connected unknown\n");
+ else if (out_data == 1)
+ return scnprintf(buf, PAGE_SIZE,
+ "unconnected [connected] unknown\n");
+ }
+ pr_err("alienware-wmi: unknown HDMI cable status: %d\n", status);
+ return scnprintf(buf, PAGE_SIZE, "unconnected connected [unknown]\n");
+}
+
+static ssize_t show_hdmi_source(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ acpi_status status;
+ u32 out_data;
+ struct hdmi_args in_args = {
+ .arg = 0,
+ };
+ status =
+ alienware_hdmi_command(&in_args, WMAX_METHOD_HDMI_STATUS,
+ (u32 *) &out_data);
if (ACPI_SUCCESS(status)) {
- obj = (union acpi_object *)output.pointer;
- if (obj && obj->type == ACPI_TYPE_INTEGER)
- tmp = (u32) obj->integer.value;
- if (tmp == 1)
+ if (out_data == 1)
return scnprintf(buf, PAGE_SIZE,
"[input] gpu unknown\n");
- else if (tmp == 2)
+ else if (out_data == 2)
return scnprintf(buf, PAGE_SIZE,
"input [gpu] unknown\n");
}
- pr_err("alienware-wmi: unknown HDMI status: %d\n", status);
+ pr_err("alienware-wmi: unknown HDMI source status: %d\n", out_data);
return scnprintf(buf, PAGE_SIZE, "input gpu [unknown]\n");
}
-static ssize_t toggle_hdmi(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
+static ssize_t toggle_hdmi_source(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
- struct acpi_buffer input;
acpi_status status;
struct hdmi_args args;
if (strcmp(buf, "gpu\n") == 0)
@@ -466,33 +510,45 @@ static ssize_t toggle_hdmi(struct device *dev, struct device_attribute *attr,
else
args.arg = 3;
pr_debug("alienware-wmi: setting hdmi to %d : %s", args.arg, buf);
- input.length = (acpi_size) sizeof(args);
- input.pointer = &args;
- status = wmi_evaluate_method(WMAX_CONTROL_GUID, 1,
- WMAX_METHOD_HDMI_SOURCE, &input, NULL);
+
+ status = alienware_hdmi_command(&args, WMAX_METHOD_HDMI_SOURCE, NULL);
+
if (ACPI_FAILURE(status))
pr_err("alienware-wmi: HDMI toggle failed: results: %u\n",
status);
return count;
}
-static DEVICE_ATTR(hdmi, S_IRUGO | S_IWUSR, show_hdmi, toggle_hdmi);
+static DEVICE_ATTR(cable, S_IRUGO, show_hdmi_cable, NULL);
+static DEVICE_ATTR(source, S_IRUGO | S_IWUSR, show_hdmi_source,
+ toggle_hdmi_source);
-static void remove_hdmi(struct platform_device *device)
+static struct attribute *hdmi_attrs[] = {
+ &dev_attr_cable.attr,
+ &dev_attr_source.attr,
+ NULL,
+};
+
+static struct attribute_group hdmi_attribute_group = {
+ .name = "hdmi",
+ .attrs = hdmi_attrs,
+};
+
+static void remove_hdmi(struct platform_device *dev)
{
- device_remove_file(&device->dev, &dev_attr_hdmi);
+ sysfs_remove_group(&dev->dev.kobj, &hdmi_attribute_group);
}
-static int create_hdmi(void)
+static int create_hdmi(struct platform_device *dev)
{
- int ret = -ENOMEM;
- ret = device_create_file(&platform_device->dev, &dev_attr_hdmi);
+ int ret;
+ ret = sysfs_create_group(&dev->dev.kobj, &hdmi_attribute_group);
if (ret)
goto error_create_hdmi;
return 0;
error_create_hdmi:
- remove_hdmi(platform_device);
+ remove_hdmi(dev);
return ret;
}
@@ -526,7 +582,7 @@ static int __init alienware_wmi_init(void)
goto fail_platform_device2;
if (interface == WMAX) {
- ret = create_hdmi();
+ ret = create_hdmi(platform_device);
if (ret)
goto fail_prep_hdmi;
}
--
1.7.9.5
--
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