[PATCH v9 4/4] input: pm8xxx-vibrator: add new SPMI vibrator support

[Fenglin Wu via B4 Relay]

From: Fenglin Wu <quic_fenglinw@xxxxxxxxxxx>

Add support for a new SPMI vibrator module which is very similar
to the vibrator module inside PM8916 but has a finer drive voltage
step and different output voltage range, its drive level control
is expanded across 2 registers. The vibrator module can be found
in following Qualcomm PMICs: PMI632, PM7250B, PM7325B, PM7550BA.

Signed-off-by: Fenglin Wu <quic_fenglinw@xxxxxxxxxxx>
---
 drivers/input/misc/pm8xxx-vibrator.c | 51 +++++++++++++++++++++++++++++-------
 1 file changed, 42 insertions(+), 9 deletions(-)

diff --git a/drivers/input/misc/pm8xxx-vibrator.c b/drivers/input/misc/pm8xxx-vibrator.c
index 2959edca8eb9..35bb6f450fd2 100644
--- a/drivers/input/misc/pm8xxx-vibrator.c
+++ b/drivers/input/misc/pm8xxx-vibrator.c
@@ -12,10 +12,10 @@
 #include <linux/regmap.h>
 #include <linux/slab.h>
 
-#define VIB_MAX_LEVEL_mV	(3100)
-#define VIB_MIN_LEVEL_mV	(1200)
-#define VIB_PER_STEP_mV	(100)
-#define VIB_MAX_LEVELS		(VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV + VIB_PER_STEP_mV)
+#define VIB_MAX_LEVEL_mV(vib)	(vib->drv2_addr ? 3544 : 3100)
+#define VIB_MIN_LEVEL_mV(vib)	(vib->drv2_addr ? 1504 : 1200)
+#define VIB_PER_STEP_mV(vib)	(vib->drv2_addr ? 8 : 100)
+#define VIB_MAX_LEVELS(vib)	(VIB_MAX_LEVEL_mV(vib) - VIB_MIN_LEVEL_mV(vib) + VIB_PER_STEP_mV(vib))
 
 #define MAX_FF_SPEED		0xff
 
@@ -26,6 +26,9 @@ struct pm8xxx_regs {
 	unsigned int drv_offset;
 	unsigned int drv_mask;
 	unsigned int drv_shift;
+	unsigned int drv2_offset;
+	unsigned int drv2_mask;
+	unsigned int drv2_shift;
 	unsigned int drv_en_manual_mask;
 };
 
@@ -45,6 +48,18 @@ static struct pm8xxx_regs pm8916_regs = {
 	.drv_en_manual_mask = 0,
 };
 
+static struct pm8xxx_regs pmi632_regs = {
+	.enable_offset = 0x46,
+	.enable_mask = BIT(7),
+	.drv_offset = 0x40,
+	.drv_mask = GENMASK(7, 0),
+	.drv_shift = 0,
+	.drv2_offset = 0x41,
+	.drv2_mask = GENMASK(3, 0),
+	.drv2_shift = 8,
+	.drv_en_manual_mask = 0,
+};
+
 /**
  * struct pm8xxx_vib - structure to hold vibrator data
  * @vib_input_dev: input device supporting force feedback
@@ -53,6 +68,7 @@ static struct pm8xxx_regs pm8916_regs = {
  * @regs: registers' info
  * @enable_addr: vibrator enable register
  * @drv_addr: vibrator drive strength register
+ * @drv2_addr: vibrator drive strength upper byte register
  * @speed: speed of vibration set from userland
  * @active: state of vibrator
  * @level: level of vibration to set in the chip
@@ -65,6 +81,7 @@ struct pm8xxx_vib {
 	const struct pm8xxx_regs *regs;
 	unsigned int enable_addr;
 	unsigned int drv_addr;
+	unsigned int drv2_addr;
 	int speed;
 	int level;
 	bool active;
@@ -82,6 +99,10 @@ static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on)
 	unsigned int val = vib->reg_vib_drv;
 	const struct pm8xxx_regs *regs = vib->regs;
 
+	/* vibrator without drv2_addr needs be programmed in step increments */
+	if (!vib->drv2_addr)
+		vib->level /= VIB_PER_STEP_mV(vib);
+
 	if (on)
 		val |= (vib->level << regs->drv_shift) & regs->drv_mask;
 	else
@@ -93,6 +114,17 @@ static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on)
 
 	vib->reg_vib_drv = val;
 
+	if (regs->drv2_mask) {
+		if (on)
+			val = (vib->level << regs->drv2_shift) & regs->drv2_mask;
+		else
+			val = 0;
+
+		rc = regmap_write_bits(vib->regmap, vib->drv2_addr, regs->drv2_mask, val);
+		if (rc < 0)
+			return rc;
+	}
+
 	if (regs->enable_mask)
 		rc = regmap_update_bits(vib->regmap, vib->enable_addr,
 					regs->enable_mask, on ? regs->enable_mask : 0);
@@ -115,17 +147,16 @@ static void pm8xxx_work_handler(struct work_struct *work)
 		return;
 
 	/*
-	 * pmic vibrator supports voltage ranges from 1.2 to 3.1V, so
+	 * pmic vibrator supports voltage ranges from MIN_LEVEL to MAX_LEVEL, so
 	 * scale the level to fit into these ranges.
 	 */
 	if (vib->speed) {
 		vib->active = true;
-		vib->level = ((VIB_MAX_LEVELS * vib->speed) / MAX_FF_SPEED) +
-						VIB_MIN_LEVEL_mV;
-		vib->level /= VIB_PER_STEP_mV;
+		vib->level = VIB_MIN_LEVEL_mV(vib);
+		vib->level += mult_frac(VIB_MAX_LEVELS(vib), vib->speed, MAX_FF_SPEED);
 	} else {
 		vib->active = false;
-		vib->level = VIB_MIN_LEVEL_mV / VIB_PER_STEP_mV;
+		vib->level = VIB_MIN_LEVEL_mV(vib);
 	}
 
 	pm8xxx_vib_set(vib, vib->active);
@@ -203,6 +234,7 @@ static int pm8xxx_vib_probe(struct platform_device *pdev)
 
 	vib->enable_addr = reg_base + regs->enable_offset;
 	vib->drv_addr = reg_base + regs->drv_offset;
+	vib->drv2_addr = reg_base + regs->drv2_offset;
 
 	/* operate in manual mode */
 	error = regmap_read(vib->regmap, vib->drv_addr, &val);
@@ -257,6 +289,7 @@ static const struct of_device_id pm8xxx_vib_id_table[] = {
 	{ .compatible = "qcom,pm8058-vib", .data = &pm8058_regs },
 	{ .compatible = "qcom,pm8921-vib", .data = &pm8058_regs },
 	{ .compatible = "qcom,pm8916-vib", .data = &pm8916_regs },
+	{ .compatible = "qcom,pmi632-vib", .data = &pmi632_regs },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, pm8xxx_vib_id_table);

-- 
2.25.1