msm: qpnp-haptic: set up sysfs interface for common cmhw implementation

 * Export vmax_mv as vtg_level
 * Add min/max/default voltage sysfs entries
 * Make min/max voltage adjustable via DT

Change-Id: Iefa3accdb75fcef9bcb2d4c730ca0a72763994f3

1 files changed, 74 insertions, 7 deletions

diff --git a/drivers/soc/qcom/qpnp-haptic.c b/drivers/soc/qcom/qpnp-haptic.c
index 064608fc81cf..c4f311f4afc4 100644
--- a/drivers/soc/qcom/qpnp-haptic.c
+++ b/drivers/soc/qcom/qpnp-haptic.c
@@ -364,6 +364,9 @@ struct qpnp_hap {
 	u32				timeout_ms;
 	u32				time_required_to_generate_back_emf_us;
 	u32				vmax_mv;
+	u32				vtg_min;
+	u32				vtg_max;
+	u32				vtg_default;
 	u32				ilim_ma;
 	u32				sc_deb_cycles;
 	u32				int_pwm_freq_khz;
@@ -889,12 +892,12 @@ static int qpnp_hap_vmax_config(struct qpnp_hap *hap, int vmax_mv,
 	if (hap->pmic_subtype != PM660_SUBTYPE)
 		overdrive = false;
 
-	if (vmax_mv < QPNP_HAP_VMAX_MIN_MV)
-		vmax_mv = QPNP_HAP_VMAX_MIN_MV;
-	else if (vmax_mv > QPNP_HAP_VMAX_MAX_MV)
-		vmax_mv = QPNP_HAP_VMAX_MAX_MV;
+	if (vmax_mv < hap->vtg_min)
+		vmax_mv = hap->vtg_min;
+	else if (vmax_mv > hap->vtg_max)
+		vmax_mv = hap->vtg_max;
 
-	val = (vmax_mv / QPNP_HAP_VMAX_MIN_MV) << QPNP_HAP_VMAX_SHIFT;
+	val = (vmax_mv / hap->vtg_min) << QPNP_HAP_VMAX_SHIFT;
 	if (overdrive)
 		val |= QPNP_HAP_VMAX_OVD_BIT;
 	rc = qpnp_hap_masked_write_reg(hap, QPNP_HAP_VMAX_REG(hap->base),
@@ -1788,9 +1791,43 @@ static ssize_t qpnp_hap_vmax_store(struct device *dev,
 		return rc;
 
 	hap->vmax_mv = data;
+	rc = qpnp_hap_vmax_config(hap, hap->vmax_mv, true);
+	if (rc)
+		return rc;
+
 	return count;
 }
 
+static ssize_t qpnp_hap_min_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct timed_output_dev *timed_dev = dev_get_drvdata(dev);
+	struct qpnp_hap *hap = container_of(timed_dev, struct qpnp_hap,
+					 timed_dev);
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", hap->vtg_min);
+}
+
+static ssize_t qpnp_hap_max_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct timed_output_dev *timed_dev = dev_get_drvdata(dev);
+	struct qpnp_hap *hap = container_of(timed_dev, struct qpnp_hap,
+					 timed_dev);
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", hap->vtg_max);
+}
+
+static ssize_t qpnp_hap_default_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct timed_output_dev *timed_dev = dev_get_drvdata(dev);
+	struct qpnp_hap *hap = container_of(timed_dev, struct qpnp_hap,
+					 timed_dev);
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", hap->vtg_default);
+}
+
 /* sysfs attributes */
 static struct device_attribute qpnp_hap_attrs[] = {
 	__ATTR(wf_s0, 0664, qpnp_hap_wf_s0_show, qpnp_hap_wf_s0_store),
@@ -1822,6 +1859,10 @@ static struct device_attribute qpnp_hap_attrs[] = {
 		qpnp_hap_override_auto_mode_show,
 		qpnp_hap_override_auto_mode_store),
 	__ATTR(vmax_mv, 0664, qpnp_hap_vmax_show, qpnp_hap_vmax_store),
+	__ATTR(vtg_level, 0664, qpnp_hap_vmax_show, qpnp_hap_vmax_store),
+	__ATTR(vtg_min, 0664, qpnp_hap_min_show, NULL),
+	__ATTR(vtg_max, 0664, qpnp_hap_max_show, NULL),
+	__ATTR(vtg_default, 0664, qpnp_hap_default_show, NULL),
 };
 
 static int calculate_lra_code(struct qpnp_hap *hap)
@@ -2148,7 +2189,7 @@ static int qpnp_hap_auto_mode_config(struct qpnp_hap *hap, int time_ms)
 			ares_cfg.calibrate_at_eop = -EINVAL;
 		}
 
-		vmax_mv = QPNP_HAP_VMAX_MAX_MV;
+		vmax_mv = hap->vtg_max;
 		rc = qpnp_hap_vmax_config(hap, vmax_mv, true);
 		if (rc < 0)
 			return rc;
@@ -2859,7 +2900,25 @@ static int qpnp_hap_parse_dt(struct qpnp_hap *hap)
 		return rc;
 	}
 
-	hap->vmax_mv = QPNP_HAP_VMAX_MAX_MV;
+	hap->vtg_min = QPNP_HAP_VMAX_MIN_MV;
+	rc = of_property_read_u32(pdev->dev.of_node, "qcom,vtg-min", &temp);
+	if (!rc) {
+		hap->vtg_min = temp;
+	} else if (rc != -EINVAL) {
+		pr_err("Unable to read vtg_min\n");
+		return rc;
+	}
+
+	hap->vtg_max = QPNP_HAP_VMAX_MAX_MV;
+	rc = of_property_read_u32(pdev->dev.of_node, "qcom,vtg-max", &temp);
+	if (!rc) {
+		hap->vtg_max = temp;
+	} else if (rc != -EINVAL) {
+		pr_err("Unable to read vtg_max\n");
+		return rc;
+	}
+
+	hap->vmax_mv = hap->vtg_max;
 	rc = of_property_read_u32(pdev->dev.of_node, "qcom,vmax-mv", &temp);
 	if (!rc) {
 		hap->vmax_mv = temp;
@@ -2868,6 +2927,14 @@ static int qpnp_hap_parse_dt(struct qpnp_hap *hap)
 		return rc;
 	}
 
+	if (hap->vmax_mv < hap->vtg_min) {
+		hap->vmax_mv = hap->vtg_min;
+	} else if (hap->vmax_mv > hap->vtg_max) {
+		hap->vmax_mv = hap->vtg_max;
+	}
+
+	hap->vtg_default = hap->vmax_mv;
+
 	hap->ilim_ma = QPNP_HAP_ILIM_MIN_MV;
 	rc = of_property_read_u32(pdev->dev.of_node, "qcom,ilim-ma", &temp);
 	if (!rc) {