ASoC: wm_adsp: Add support for TLV based binary controls

This patch adds support for the arbitrary length TLV based binary
controls. This allows users to properly access controls that are
more than 512 bytes in length.
Signed-off-by: NCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/codecs/wm_adsp.c

@@ -160,6 +160,8 @@
 #define ADSP2_RAM_RDY_SHIFT                    0
 #define ADSP2_RAM_RDY_WIDTH                    1
 
+#define ADSP_MAX_STD_CTRL_SIZE               512
+
 struct wm_adsp_buf {
 	struct list_head list;
 	void *buf;
@@ -435,6 +437,7 @@ struct wm_coeff_ctl {
 	size_t len;
 	unsigned int set:1;
 	struct snd_kcontrol *kcontrol;
+	struct soc_bytes_ext bytes_ext;
 	unsigned int flags;
 };
 
@@ -711,10 +714,17 @@ static void wm_adsp2_show_fw_status(struct wm_adsp *dsp)
 		 be16_to_cpu(scratch[3]));
 }
 
+static inline struct wm_coeff_ctl *bytes_ext_to_ctl(struct soc_bytes_ext *ext)
+{
+	return container_of(ext, struct wm_coeff_ctl, bytes_ext);
+}
+
 static int wm_coeff_info(struct snd_kcontrol *kctl,
 			 struct snd_ctl_elem_info *uinfo)
 {
-	struct wm_coeff_ctl *ctl = (struct wm_coeff_ctl *)kctl->private_value;
+	struct soc_bytes_ext *bytes_ext =
+		(struct soc_bytes_ext *)kctl->private_value;
+	struct wm_coeff_ctl *ctl = bytes_ext_to_ctl(bytes_ext);
 
 	uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
 	uinfo->count = ctl->len;
@@ -763,7 +773,9 @@ static int wm_coeff_write_control(struct wm_coeff_ctl *ctl,
 static int wm_coeff_put(struct snd_kcontrol *kctl,
 			struct snd_ctl_elem_value *ucontrol)
 {
-	struct wm_coeff_ctl *ctl = (struct wm_coeff_ctl *)kctl->private_value;
+	struct soc_bytes_ext *bytes_ext =
+		(struct soc_bytes_ext *)kctl->private_value;
+	struct wm_coeff_ctl *ctl = bytes_ext_to_ctl(bytes_ext);
 	char *p = ucontrol->value.bytes.data;
 	int ret = 0;
 
@@ -780,6 +792,29 @@ static int wm_coeff_put(struct snd_kcontrol *kctl,
 	return ret;
 }
 
+static int wm_coeff_tlv_put(struct snd_kcontrol *kctl,
+			    const unsigned int __user *bytes, unsigned int size)
+{
+	struct soc_bytes_ext *bytes_ext =
+		(struct soc_bytes_ext *)kctl->private_value;
+	struct wm_coeff_ctl *ctl = bytes_ext_to_ctl(bytes_ext);
+	int ret = 0;
+
+	mutex_lock(&ctl->dsp->pwr_lock);
+
+	if (copy_from_user(ctl->cache, bytes, size)) {
+		ret = -EFAULT;
+	} else {
+		ctl->set = 1;
+		if (ctl->enabled)
+			ret = wm_coeff_write_control(ctl, ctl->cache, size);
+	}
+
+	mutex_unlock(&ctl->dsp->pwr_lock);
+
+	return ret;
+}
+
 static int wm_coeff_read_control(struct wm_coeff_ctl *ctl,
 				 void *buf, size_t len)
 {
@@ -822,7 +857,9 @@ static int wm_coeff_read_control(struct wm_coeff_ctl *ctl,
 static int wm_coeff_get(struct snd_kcontrol *kctl,
 			struct snd_ctl_elem_value *ucontrol)
 {
-	struct wm_coeff_ctl *ctl = (struct wm_coeff_ctl *)kctl->private_value;
+	struct soc_bytes_ext *bytes_ext =
+		(struct soc_bytes_ext *)kctl->private_value;
+	struct wm_coeff_ctl *ctl = bytes_ext_to_ctl(bytes_ext);
 	char *p = ucontrol->value.bytes.data;
 	int ret = 0;
 
@@ -845,12 +882,72 @@ static int wm_coeff_get(struct snd_kcontrol *kctl,
 	return ret;
 }
 
+static int wm_coeff_tlv_get(struct snd_kcontrol *kctl,
+			    unsigned int __user *bytes, unsigned int size)
+{
+	struct soc_bytes_ext *bytes_ext =
+		(struct soc_bytes_ext *)kctl->private_value;
+	struct wm_coeff_ctl *ctl = bytes_ext_to_ctl(bytes_ext);
+	int ret = 0;
+
+	mutex_lock(&ctl->dsp->pwr_lock);
+
+	if (ctl->flags & WMFW_CTL_FLAG_VOLATILE) {
+		if (ctl->enabled)
+			ret = wm_coeff_read_control(ctl, ctl->cache, size);
+		else
+			ret = -EPERM;
+	} else {
+		if (!ctl->flags && ctl->enabled)
+			ret = wm_coeff_read_control(ctl, ctl->cache, size);
+	}
+
+	if (!ret && copy_to_user(bytes, ctl->cache, size))
+		ret = -EFAULT;
+
+	mutex_unlock(&ctl->dsp->pwr_lock);
+
+	return ret;
+}
+
 struct wmfw_ctl_work {
 	struct wm_adsp *dsp;
 	struct wm_coeff_ctl *ctl;
 	struct work_struct work;
 };
 
+static unsigned int wmfw_convert_flags(unsigned int in, unsigned int len)
+{
+	unsigned int out, rd, wr, vol;
+
+	if (len > ADSP_MAX_STD_CTRL_SIZE) {
+		rd = SNDRV_CTL_ELEM_ACCESS_TLV_READ;
+		wr = SNDRV_CTL_ELEM_ACCESS_TLV_WRITE;
+		vol = SNDRV_CTL_ELEM_ACCESS_VOLATILE;
+
+		out = SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
+	} else {
+		rd = SNDRV_CTL_ELEM_ACCESS_READ;
+		wr = SNDRV_CTL_ELEM_ACCESS_WRITE;
+		vol = SNDRV_CTL_ELEM_ACCESS_VOLATILE;
+
+		out = 0;
+	}
+
+	if (in) {
+		if (in & WMFW_CTL_FLAG_READABLE)
+			out |= rd;
+		if (in & WMFW_CTL_FLAG_WRITEABLE)
+			out |= wr;
+		if (in & WMFW_CTL_FLAG_VOLATILE)
+			out |= vol;
+	} else {
+		out |= rd | wr | vol;
+	}
+
+	return out;
+}
+
 static int wmfw_add_ctl(struct wm_adsp *dsp, struct wm_coeff_ctl *ctl)
 {
 	struct snd_kcontrol_new *kcontrol;
@@ -868,19 +965,15 @@ static int wmfw_add_ctl(struct wm_adsp *dsp, struct wm_coeff_ctl *ctl)
 	kcontrol->info = wm_coeff_info;
 	kcontrol->get = wm_coeff_get;
 	kcontrol->put = wm_coeff_put;
-	kcontrol->private_value = (unsigned long)ctl;
+	kcontrol->iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+	kcontrol->tlv.c = snd_soc_bytes_tlv_callback;
+	kcontrol->private_value = (unsigned long)&ctl->bytes_ext;
 
-	if (ctl->flags) {
-		if (ctl->flags & WMFW_CTL_FLAG_WRITEABLE)
-			kcontrol->access |= SNDRV_CTL_ELEM_ACCESS_WRITE;
-		if (ctl->flags & WMFW_CTL_FLAG_READABLE)
-			kcontrol->access |= SNDRV_CTL_ELEM_ACCESS_READ;
-		if (ctl->flags & WMFW_CTL_FLAG_VOLATILE)
-			kcontrol->access |= SNDRV_CTL_ELEM_ACCESS_VOLATILE;
-	} else {
-		kcontrol->access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
-		kcontrol->access |= SNDRV_CTL_ELEM_ACCESS_VOLATILE;
-	}
+	ctl->bytes_ext.max = ctl->len;
+	ctl->bytes_ext.get = wm_coeff_tlv_get;
+	ctl->bytes_ext.put = wm_coeff_tlv_put;
+
+	kcontrol->access = wmfw_convert_flags(ctl->flags, ctl->len);
 
 	ret = snd_soc_add_card_controls(dsp->card, kcontrol, 1);
 	if (ret < 0)
@@ -1032,11 +1125,6 @@ static int wm_adsp_create_control(struct wm_adsp *dsp,
 
 	ctl->flags = flags;
 	ctl->offset = offset;
-	if (len > 512) {
-		adsp_warn(dsp, "Truncating control %s from %d\n",
-			  ctl->name, len);
-		len = 512;
-	}
 	ctl->len = len;
 	ctl->cache = kzalloc(ctl->len, GFP_KERNEL);
 	if (!ctl->cache) {