ASoC: wm_adsp: Add basic debugfs entries

This patch adds some debugfs nodes to get information
about the currently running firmware.

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 192 insertions, 3 deletions

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index 214b86b8b132..f9f90b0f5db4 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -23,6 +23,7 @@
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/workqueue.h>
+#include <linux/debugfs.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -248,6 +249,175 @@ struct wm_coeff_ctl {
         unsigned int flags;
 };
 
+#ifdef CONFIG_DEBUG_FS
+static void wm_adsp_debugfs_save_wmfwname(struct wm_adsp *dsp, const char *s)
+{
+        char *tmp = kasprintf(GFP_KERNEL, "%s\n", s);
+
+        mutex_lock(&dsp->debugfs_lock);
+        kfree(dsp->wmfw_file_name);
+        dsp->wmfw_file_name = tmp;
+        mutex_unlock(&dsp->debugfs_lock);
+}
+
+static void wm_adsp_debugfs_save_binname(struct wm_adsp *dsp, const char *s)
+{
+        char *tmp = kasprintf(GFP_KERNEL, "%s\n", s);
+
+        mutex_lock(&dsp->debugfs_lock);
+        kfree(dsp->bin_file_name);
+        dsp->bin_file_name = tmp;
+        mutex_unlock(&dsp->debugfs_lock);
+}
+
+static void wm_adsp_debugfs_clear(struct wm_adsp *dsp)
+{
+        mutex_lock(&dsp->debugfs_lock);
+        kfree(dsp->wmfw_file_name);
+        kfree(dsp->bin_file_name);
+        dsp->wmfw_file_name = NULL;
+        dsp->bin_file_name = NULL;
+        mutex_unlock(&dsp->debugfs_lock);
+}
+
+static ssize_t wm_adsp_debugfs_wmfw_read(struct file *file,
+                                         char __user *user_buf,
+                                         size_t count, loff_t *ppos)
+{
+        struct wm_adsp *dsp = file->private_data;
+        ssize_t ret;
+
+        mutex_lock(&dsp->debugfs_lock);
+
+        if (!dsp->wmfw_file_name || !dsp->running)
+                ret = 0;
+        else
+                ret = simple_read_from_buffer(user_buf, count, ppos,
+                                              dsp->wmfw_file_name,
+                                              strlen(dsp->wmfw_file_name));
+
+        mutex_unlock(&dsp->debugfs_lock);
+        return ret;
+}
+
+static ssize_t wm_adsp_debugfs_bin_read(struct file *file,
+                                        char __user *user_buf,
+                                        size_t count, loff_t *ppos)
+{
+        struct wm_adsp *dsp = file->private_data;
+        ssize_t ret;
+
+        mutex_lock(&dsp->debugfs_lock);
+
+        if (!dsp->bin_file_name || !dsp->running)
+                ret = 0;
+        else
+                ret = simple_read_from_buffer(user_buf, count, ppos,
+                                              dsp->bin_file_name,
+                                              strlen(dsp->bin_file_name));
+
+        mutex_unlock(&dsp->debugfs_lock);
+        return ret;
+}
+
+static const struct {
+        const char *name;
+        const struct file_operations fops;
+} wm_adsp_debugfs_fops[] = {
+        {
+                .name = "wmfw_file_name",
+                .fops = {
+                        .open = simple_open,
+                        .read = wm_adsp_debugfs_wmfw_read,
+                },
+        },
+        {
+                .name = "bin_file_name",
+                .fops = {
+                        .open = simple_open,
+                        .read = wm_adsp_debugfs_bin_read,
+                },
+        },
+};
+
+static void wm_adsp2_init_debugfs(struct wm_adsp *dsp,
+                                  struct snd_soc_codec *codec)
+{
+        struct dentry *root = NULL;
+        char *root_name;
+        int i;
+
+        if (!codec->component.debugfs_root) {
+                adsp_err(dsp, "No codec debugfs root\n");
+                goto err;
+        }
+
+        root_name = kmalloc(PAGE_SIZE, GFP_KERNEL);
+        if (!root_name)
+                goto err;
+
+        snprintf(root_name, PAGE_SIZE, "dsp%d", dsp->num);
+        root = debugfs_create_dir(root_name, codec->component.debugfs_root);
+        kfree(root_name);
+
+        if (!root)
+                goto err;
+
+        if (!debugfs_create_bool("running", S_IRUGO, root, &dsp->running))
+                goto err;
+
+        if (!debugfs_create_x32("fw_id", S_IRUGO, root, &dsp->fw_id))
+                goto err;
+
+        if (!debugfs_create_x32("fw_version", S_IRUGO, root,
+                                &dsp->fw_id_version))
+                goto err;
+
+        for (i = 0; i < ARRAY_SIZE(wm_adsp_debugfs_fops); ++i) {
+                if (!debugfs_create_file(wm_adsp_debugfs_fops[i].name,
+                                         S_IRUGO, root, dsp,
+                                         &wm_adsp_debugfs_fops[i].fops))
+                        goto err;
+        }
+
+        dsp->debugfs_root = root;
+        return;
+
+err:
+        debugfs_remove_recursive(root);
+        adsp_err(dsp, "Failed to create debugfs\n");
+}
+
+static void wm_adsp2_cleanup_debugfs(struct wm_adsp *dsp)
+{
+        wm_adsp_debugfs_clear(dsp);
+        debugfs_remove_recursive(dsp->debugfs_root);
+}
+#else
+static inline void wm_adsp2_init_debugfs(struct wm_adsp *dsp,
+                                         struct snd_soc_codec *codec)
+{
+}
+
+static inline void wm_adsp2_cleanup_debugfs(struct wm_adsp *dsp)
+{
+}
+
+static inline void wm_adsp_debugfs_save_wmfwname(struct wm_adsp *dsp,
+                                                 const char *s)
+{
+}
+
+static inline void wm_adsp_debugfs_save_binname(struct wm_adsp *dsp,
+                                                const char *s)
+{
+}
+
+static inline void wm_adsp_debugfs_clear(struct wm_adsp *dsp)
+{
+}
+#endif
+
 static int wm_adsp_fw_get(struct snd_kcontrol *kcontrol,
                           struct snd_ctl_elem_value *ucontrol)
 {
@@ -1133,6 +1303,8 @@ static int wm_adsp_load(struct wm_adsp *dsp)
                 adsp_warn(dsp, "%s.%d: %zu bytes at end of file\n",
                           file, regions, pos - firmware->size);
 
+        wm_adsp_debugfs_save_wmfwname(dsp, file);
+
 out_fw:
         regmap_async_complete(regmap);
         wm_adsp_buf_free(&buf_list);
@@ -1350,11 +1522,12 @@ static int wm_adsp2_setup_algs(struct wm_adsp *dsp)
 
         n_algs = be32_to_cpu(adsp2_id.n_algs);
         dsp->fw_id = be32_to_cpu(adsp2_id.fw.id);
+        dsp->fw_id_version = be32_to_cpu(adsp2_id.fw.ver);
         adsp_info(dsp, "Firmware: %x v%d.%d.%d, %zu algorithms\n",
                   dsp->fw_id,
-                  (be32_to_cpu(adsp2_id.fw.ver) & 0xff0000) >> 16,
-                  (be32_to_cpu(adsp2_id.fw.ver) & 0xff00) >> 8,
-                  be32_to_cpu(adsp2_id.fw.ver) & 0xff,
+                  (dsp->fw_id_version & 0xff0000) >> 16,
+                  (dsp->fw_id_version & 0xff00) >> 8,
+                  dsp->fw_id_version & 0xff,
                   n_algs);
 
         alg_region = wm_adsp_create_region(dsp, WMFW_ADSP2_XM,
@@ -1630,6 +1803,8 @@ static int wm_adsp_load_coeff(struct wm_adsp *dsp)
                 adsp_warn(dsp, "%s.%d: %zu bytes at end of file\n",
                           file, blocks, pos - firmware->size);
 
+        wm_adsp_debugfs_save_binname(dsp, file);
+
 out_fw:
         regmap_async_complete(regmap);
         release_firmware(firmware);
@@ -1643,6 +1818,9 @@ int wm_adsp1_init(struct wm_adsp *dsp)
 {
         INIT_LIST_HEAD(&dsp->alg_regions);
 
+#ifdef CONFIG_DEBUG_FS
+        mutex_init(&dsp->debugfs_lock);
+#endif
         return 0;
 }
 EXPORT_SYMBOL_GPL(wm_adsp1_init);
@@ -1901,6 +2079,10 @@ int wm_adsp2_event(struct snd_soc_dapm_widget *w,
                 /* Log firmware state, it can be useful for analysis */
                 wm_adsp2_show_fw_status(dsp);
 
+                wm_adsp_debugfs_clear(dsp);
+
+                dsp->fw_id = 0;
+                dsp->fw_id_version = 0;
                 dsp->running = false;
 
                 regmap_update_bits(dsp->regmap, dsp->base + ADSP2_CONTROL,
@@ -1940,6 +2122,8 @@ EXPORT_SYMBOL_GPL(wm_adsp2_event);
 
 int wm_adsp2_codec_probe(struct wm_adsp *dsp, struct snd_soc_codec *codec)
 {
+        wm_adsp2_init_debugfs(dsp, codec);
+
         return snd_soc_add_codec_controls(codec,
                                           wm_adsp2_fw_controls[dsp->num - 1],
                                           ARRAY_SIZE(wm_adsp2_fw_controls[0]));
@@ -1948,6 +2132,8 @@ EXPORT_SYMBOL_GPL(wm_adsp2_codec_probe);
 
 int wm_adsp2_codec_remove(struct wm_adsp *dsp, struct snd_soc_codec *codec)
 {
+        wm_adsp2_cleanup_debugfs(dsp);
+
         return 0;
 }
 EXPORT_SYMBOL_GPL(wm_adsp2_codec_remove);
@@ -1971,6 +2157,9 @@ int wm_adsp2_init(struct wm_adsp *dsp)
         INIT_LIST_HEAD(&dsp->ctl_list);
         INIT_WORK(&dsp->boot_work, wm_adsp2_boot_work);
 
+#ifdef CONFIG_DEBUG_FS
+        mutex_init(&dsp->debugfs_lock);
+#endif
         return 0;
 }
 EXPORT_SYMBOL_GPL(wm_adsp2_init);