Revert "Revert "misc: cs40l25: Add plwe ramp down interface""

This reverts commit bb43033eb703bfb38b3bb4a13756ae41f36f3250.

Reason for revert: vendor release a 10.7.9 FW to solve this issue
Bug: 205323128
Bug: 206645006
Test: Reproduce step: adb shell cmd vibrator_manager synced waveform 1 10 20 20 10 40
Change-Id: I38ee4a799ef28b86490509d168fd4a8a29db177c

Change-Id: Idf8942f26c62c9de7c6a48501f4c3cc242c789f3

1 files changed, 77 insertions, 0 deletions

diff --git a/cs40l25/cs40l2x.c b/cs40l25/cs40l2x.c
index 1c65044..977c09c 100644
--- a/cs40l25/cs40l2x.c
+++ b/cs40l25/cs40l2x.c
@@ -6438,10 +6438,86 @@ err_mutex:
 	return count;
 }
 
+static ssize_t cs40l2x_pwle_ramp_down_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct cs40l2x_private *cs40l2x = cs40l2x_get_private(dev);
+	int ret;
+	unsigned int reg, val;
+
+	pm_runtime_get_sync(cs40l2x->dev);
+	mutex_lock(&cs40l2x->lock);
+
+	reg = cs40l2x_dsp_reg(cs40l2x, "RAMPDOWN_COEFF",
+			      CS40L2X_XM_UNPACKED_TYPE,
+				cs40l2x->fw_desc->id);
+	if (!reg) {
+		ret = -EPERM;
+		goto err_mutex;
+	}
+
+	ret = regmap_read(cs40l2x->regmap, reg, &val);
+	if (ret)
+		goto err_mutex;
+
+	/* Q0.24 format */
+	ret = snprintf(buf, PAGE_SIZE, "%u\n", val);
+
+err_mutex:
+	mutex_unlock(&cs40l2x->lock);
+	pm_runtime_mark_last_busy(cs40l2x->dev);
+	pm_runtime_put_autosuspend(cs40l2x->dev);
+
+	return ret;
+}
+
+static ssize_t cs40l2x_pwle_ramp_down_store(struct device *dev,
+					  struct device_attribute *attr,
+					  const char *buf,
+					  size_t count)
+{
+	struct cs40l2x_private *cs40l2x = cs40l2x_get_private(dev);
+	int ret;
+	unsigned int reg, val;
+
+	ret = kstrtou32(buf, 10, &val);
+	if (ret)
+		return -EINVAL;
+
+	pm_runtime_get_sync(cs40l2x->dev);
+	mutex_lock(&cs40l2x->lock);
+
+	reg = cs40l2x_dsp_reg(cs40l2x, "RAMPDOWN_COEFF",
+			      CS40L2X_XM_UNPACKED_TYPE,
+				cs40l2x->fw_desc->id);
+	if (!reg) {
+		ret = -EPERM;
+		goto err_mutex;
+	}
+
+	/* Q0.24 format */
+	/* Zero value means that PWLE Ramp down is off */
+	ret = regmap_write(cs40l2x->regmap, reg, val);
+	if (ret)
+		goto err_mutex;
+
+	ret = count;
+
+err_mutex:
+	mutex_unlock(&cs40l2x->lock);
+	pm_runtime_mark_last_busy(cs40l2x->dev);
+	pm_runtime_put_autosuspend(cs40l2x->dev);
+
+	return ret;
+}
+
 static DEVICE_ATTR(cp_trigger_index, 0660, cs40l2x_cp_trigger_index_show,
 		cs40l2x_cp_trigger_index_store);
 static DEVICE_ATTR(cp_trigger_queue, 0660, cs40l2x_cp_trigger_queue_show,
 		cs40l2x_cp_trigger_queue_store);
+static DEVICE_ATTR(pwle_ramp_down, 0660, cs40l2x_pwle_ramp_down_show,
+		cs40l2x_pwle_ramp_down_store);
 static DEVICE_ATTR(cp_trigger_duration, 0660, cs40l2x_cp_trigger_duration_show,
 		NULL);
 static DEVICE_ATTR(cp_trigger_q_sub, 0660, cs40l2x_cp_trigger_q_sub_show,
@@ -6656,6 +6732,7 @@ static struct attribute *cs40l2x_dev_attrs[] = {
 	&dev_attr_virtual_pwle_indexes.attr,
 	&dev_attr_available_pwle_segments.attr,
 	&dev_attr_boost_ipk.attr,
+	&dev_attr_pwle_ramp_down.attr,
 	NULL,
 };