[PATCH v4 02/17] ALSA: hda: hda_cs_dsp_ctl: Add apis to write the controls directly

[Vitaly Rodionov <vitalyr@xxxxxxxxxxxxxxxxxxxxx>]

From: Stefan Binding <sbinding@xxxxxxxxxxxxxxxxxxxxx>

DSP controls are exposed as ALSA controls, however,
some of these controls are required to be accessed by
the driver. Add apis which allow read/write of these
controls. The write api will also notify the ALSA control
on value change.

Signed-off-by: Stefan Binding <sbinding@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Vitaly Rodionov <vitalyr@xxxxxxxxxxxxxxxxxxxxx>
---

Changes since v2:
 - No change

 sound/pci/hda/hda_cs_dsp_ctl.c | 52 ++++++++++++++++++++++++++++++++++
 sound/pci/hda/hda_cs_dsp_ctl.h |  4 +++
 2 files changed, 56 insertions(+)

diff --git a/sound/pci/hda/hda_cs_dsp_ctl.c b/sound/pci/hda/hda_cs_dsp_ctl.c
index 46df48ff2ae1..3b837d000a00 100644
--- a/sound/pci/hda/hda_cs_dsp_ctl.c
+++ b/sound/pci/hda/hda_cs_dsp_ctl.c
@@ -237,6 +237,58 @@ void hda_cs_dsp_control_remove(struct cs_dsp_coeff_ctl *cs_ctl)
 }
 EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_control_remove, SND_HDA_CS_DSP_CONTROLS);
 
+int hda_cs_dsp_write_ctl(struct cs_dsp *dsp, const char *name, int type,
+			 unsigned int alg, void *buf, size_t len)
+{
+	struct cs_dsp_coeff_ctl *cs_ctl;
+	struct hda_cs_dsp_coeff_ctl *ctl;
+	struct snd_kcontrol *kctl;
+	int ret;
+
+	cs_ctl = cs_dsp_get_ctl(dsp, name, type, alg);
+	if (!cs_ctl)
+		return -EINVAL;
+
+	ctl = cs_ctl->priv;
+
+	if (len > cs_ctl->len)
+		return -EINVAL;
+
+	ret = cs_dsp_coeff_write_ctrl(cs_ctl, 0, buf, len);
+	if (ret)
+		return ret;
+
+	if (cs_ctl->flags & WMFW_CTL_FLAG_SYS)
+		return 0;
+
+	list_for_each_entry(kctl, &ctl->card->controls, list)
+		if (!strncmp(kctl->id.name, ctl->name, sizeof(kctl->id.name))) {
+			snd_ctl_notify(ctl->card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
+			return 0;
+		}
+
+	dev_warn(dsp->dev, "Cannot find Control for %s\n", name);
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_write_ctl, SND_HDA_CS_DSP_CONTROLS);
+
+int hda_cs_dsp_read_ctl(struct cs_dsp *dsp, const char *name, int type,
+			unsigned int alg, void *buf, size_t len)
+{
+	struct cs_dsp_coeff_ctl *cs_ctl;
+
+	cs_ctl = cs_dsp_get_ctl(dsp, name, type, alg);
+	if (!cs_ctl)
+		return -EINVAL;
+
+	if (len > cs_ctl->len)
+		return -EINVAL;
+
+	return cs_dsp_coeff_read_ctrl(cs_ctl, 0, buf, len);
+}
+EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_read_ctl, SND_HDA_CS_DSP_CONTROLS);
+
 MODULE_DESCRIPTION("CS_DSP ALSA Control HDA Library");
 MODULE_AUTHOR("Stefan Binding, <sbinding@xxxxxxxxxxxxxxxxxxxxx>");
 MODULE_LICENSE("GPL");
diff --git a/sound/pci/hda/hda_cs_dsp_ctl.h b/sound/pci/hda/hda_cs_dsp_ctl.h
index 3c90312b45d6..65b9c5c68957 100644
--- a/sound/pci/hda/hda_cs_dsp_ctl.h
+++ b/sound/pci/hda/hda_cs_dsp_ctl.h
@@ -30,5 +30,9 @@ struct hda_cs_dsp_ctl_info {
 int hda_cs_dsp_control_add(struct cs_dsp_coeff_ctl *cs_ctl, struct hda_cs_dsp_ctl_info *info);
 void hda_cs_dsp_control_remove(struct cs_dsp_coeff_ctl *cs_ctl);
 int hda_cs_dsp_remove_kcontrol(struct snd_card *card, const char *name);
+int hda_cs_dsp_write_ctl(struct cs_dsp *dsp, const char *name, int type,
+			 unsigned int alg, void *buf, size_t len);
+int hda_cs_dsp_read_ctl(struct cs_dsp *dsp, const char *name, int type,
+			unsigned int alg, void *buf, size_t len);
 
 #endif /*__HDA_CS_DSP_CTL_H__*/
-- 
2.34.1