dsp: add support to send uevents
Add a common function handle to send uevents from q6 layer.
Add functions to initialize and cleanup the kernel object required
to send uevents.
CRs-Fixed: 2211324
Change-Id: I9dceb4eb16d6941600455602f78f4f1498171d19
Signed-off-by: Vignesh Kulothungan <vigneshk@codeaurora.org>
diff --git a/dsp/q6core.c b/dsp/q6core.c
index 1844523..2cf5117 100644
--- a/dsp/q6core.c
+++ b/dsp/q6core.c
@@ -18,6 +18,8 @@
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/kobject.h>
#include <dsp/q6core.h>
#include <dsp/audio_cal_utils.h>
#include <dsp/apr_audio-v2.h>
@@ -82,6 +84,106 @@
};
static struct generic_get_data_ *generic_get_data;
+static DEFINE_MUTEX(kset_lock);
+static struct kset *audio_uevent_kset;
+
+static int q6core_init_uevent_kset(void)
+{
+ int ret = 0;
+
+ mutex_lock(&kset_lock);
+ if (audio_uevent_kset)
+ goto done;
+
+ /* Create a kset under /sys/kernel/ */
+ audio_uevent_kset = kset_create_and_add("q6audio", NULL, kernel_kobj);
+ if (!audio_uevent_kset) {
+ pr_err("%s: error creating uevent kernel set", __func__);
+ ret = -EINVAL;
+ }
+done:
+ mutex_unlock(&kset_lock);
+ return ret;
+}
+
+static void q6core_destroy_uevent_kset(void)
+{
+ if (audio_uevent_kset) {
+ kset_unregister(audio_uevent_kset);
+ audio_uevent_kset = NULL;
+ }
+}
+
+/**
+ * q6core_init_uevent_data - initialize kernel object required to send uevents.
+ *
+ * @uevent_data: uevent data (dynamically allocated memory).
+ * @name: name of the kernel object.
+ *
+ * Returns 0 on success or error otherwise.
+ */
+int q6core_init_uevent_data(struct audio_uevent_data *uevent_data, char *name)
+{
+ int ret = -EINVAL;
+
+ if (!uevent_data || !name)
+ return ret;
+
+ ret = q6core_init_uevent_kset();
+ if (ret)
+ return ret;
+
+ /* Set kset for kobject before initializing the kobject */
+ uevent_data->kobj.kset = audio_uevent_kset;
+
+ /* Initialize kobject and add it to kernel */
+ ret = kobject_init_and_add(&uevent_data->kobj, &uevent_data->ktype,
+ NULL, "%s", name);
+ if (ret) {
+ pr_err("%s: error initializing uevent kernel object: %d",
+ __func__, ret);
+ kobject_put(&uevent_data->kobj);
+ return ret;
+ }
+
+ /* Send kobject add event to the system */
+ kobject_uevent(&uevent_data->kobj, KOBJ_ADD);
+
+ return ret;
+}
+EXPORT_SYMBOL(q6core_init_uevent_data);
+
+/**
+ * q6core_destroy_uevent_data - destroy kernel object.
+ *
+ * @uevent_data: uevent data.
+ */
+void q6core_destroy_uevent_data(struct audio_uevent_data *uevent_data)
+{
+ if (uevent_data)
+ kobject_put(&uevent_data->kobj);
+}
+EXPORT_SYMBOL(q6core_destroy_uevent_data);
+
+/**
+ * q6core_send_uevent - send uevent to userspace.
+ *
+ * @uevent_data: uevent data.
+ * @event: event to send.
+ *
+ * Returns 0 on success or error otherwise.
+ */
+int q6core_send_uevent(struct audio_uevent_data *uevent_data, char *event)
+{
+ char *env[] = { event, NULL };
+
+ if (!event || !uevent_data)
+ return -EINVAL;
+
+ return kobject_uevent_env(&uevent_data->kobj, KOBJ_CHANGE, env);
+}
+EXPORT_SYMBOL(q6core_send_uevent);
+
static int parse_fwk_version_info(uint32_t *payload)
{
size_t ver_size;
@@ -1110,6 +1212,7 @@
mutex_init(&q6core_lcl.ver_lock);
q6core_init_cal_data();
+ q6core_init_uevent_kset();
return 0;
}
@@ -1119,6 +1222,7 @@
mutex_destroy(&q6core_lcl.cmd_lock);
mutex_destroy(&q6core_lcl.ver_lock);
q6core_delete_cal_data();
+ q6core_destroy_uevent_kset();
}
MODULE_DESCRIPTION("ADSP core driver");
MODULE_LICENSE("GPL v2");