ASoC: Intel: atom: Add sysfs entry in order to store FW version

This patch is adding a sysfs entry in order to be able to get
access to SST FW version.

Signed-off-by: Sebastien Guiriec <sebastien.guiriec@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/sound/soc/intel/atom/sst/sst.c b/sound/soc/intel/atom/sst/sst.c
index 9b6e27385dc9..f9ba71315e33 100644
--- a/sound/soc/intel/atom/sst/sst.c
+++ b/sound/soc/intel/atom/sst/sst.c
@@ -27,6 +27,7 @@
 #include <linux/pm_qos.h>
 #include <linux/async.h>
 #include <linux/acpi.h>
+#include <linux/sysfs.h>
 #include <sound/core.h>
 #include <sound/soc.h>
 #include <asm/platform_sst_audio.h>
@@ -242,6 +243,32 @@ int sst_alloc_drv_context(struct intel_sst_drv **ctx,
 }
 EXPORT_SYMBOL_GPL(sst_alloc_drv_context);
 
+static ssize_t firmware_version_show(struct device *dev,
+                            struct device_attribute *attr, char *buf)
+{
+        struct intel_sst_drv *ctx = dev_get_drvdata(dev);
+
+        if (ctx->fw_version.type == 0 && ctx->fw_version.major == 0 &&
+            ctx->fw_version.minor == 0 && ctx->fw_version.build == 0)
+                return sprintf(buf, "FW not yet loaded\n");
+        else
+                return sprintf(buf, "v%02x.%02x.%02x.%02x\n",
+                               ctx->fw_version.type, ctx->fw_version.major,
+                               ctx->fw_version.minor, ctx->fw_version.build);
+
+}
+
+DEVICE_ATTR_RO(firmware_version);
+
+static const struct attribute *sst_fw_version_attrs[] = {
+        &dev_attr_firmware_version.attr,
+        NULL,
+};
+
+static const struct attribute_group sst_fw_version_attr_group = {
+        .attrs = (struct attribute **)sst_fw_version_attrs,
+};
+
 int sst_context_init(struct intel_sst_drv *ctx)
 {
         int ret = 0, i;
@@ -315,8 +342,19 @@ int sst_context_init(struct intel_sst_drv *ctx)
                 dev_err(ctx->dev, "Firmware download failed:%d\n", ret);
                 goto do_free_mem;
         }
+
+        ret = sysfs_create_group(&ctx->dev->kobj,
+                                 &sst_fw_version_attr_group);
+        if (ret) {
+                dev_err(ctx->dev,
+                        "Unable to create sysfs\n");
+                goto err_sysfs;
+        }
+
         sst_register(ctx->dev);
         return 0;
+err_sysfs:
+        sysfs_remove_group(&ctx->dev->kobj, &sst_fw_version_attr_group);
 
 do_free_mem:
         destroy_workqueue(ctx->post_msg_wq);
@@ -330,6 +368,7 @@ void sst_context_cleanup(struct intel_sst_drv *ctx)
         pm_runtime_disable(ctx->dev);
         sst_unregister(ctx->dev);
         sst_set_fw_state_locked(ctx, SST_SHUTDOWN);
+        sysfs_remove_group(&ctx->dev->kobj, &sst_fw_version_attr_group);
         flush_scheduled_work();
         destroy_workqueue(ctx->post_msg_wq);
         pm_qos_remove_request(ctx->qos);