Date:   Sat, 15 Oct 2022 17:30:56 +0000
From:   Caleb Connolly <caleb@...nolly.tech>
To:     caleb@...nolly.tech
Cc:     krzysztof.kozlowski@...aro.org, phone-devel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        devicetree@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jeff LaBundy <jeff@...undy.com>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Rob Herring <robh+dt@...nel.org>, Tom Rix <trix@...hat.com>
Subject: [PATCH v7 2/2] input: add Qualcomm SPMI haptics driver

Add support for the haptics found in pmi8998 and related PMICs.
Based on the ff-memless interface. Currently this driver provides
a partial implementation of hardware features.

This driver only supports LRAs (Linear Resonant Actuators) in the "buffer"
mode with a single wave pattern.

Signed-off-by: Caleb Connolly <caleb@...nolly.tech>
---
 drivers/input/misc/Kconfig                |  15 +
 drivers/input/misc/Makefile               |   1 +
 drivers/input/misc/qcom-pmi8998-haptics.c | 690 ++++++++++++++++++++++
 3 files changed, 706 insertions(+)
 create mode 100644 drivers/input/misc/qcom-pmi8998-haptics.c

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index a18ab7358d8f..608a64fa7914 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -186,6 +186,21 @@ config INPUT_PMIC8XXX_PWRKEY
 	  To compile this driver as a module, choose M here: the
 	  module will be called pmic8xxx-pwrkey.

+config INPUT_QCOM_PMI8998_HAPTICS
+	tristate "Qualcomm SPMI HAPTICS"
+	depends on ARCH_QCOM || COMPILE_TEST
+	depends on MFD_PM8XXX || MFD_SPMI_PMIC || COMPILE_TEST
+	select INPUT_FF_MEMLESS
+	help
+	  This option enables support for the haptics found in pmi8998 and
+	  related PMICs. Based on the ff-memless interface.
+
+	  This driver is for hardware too new for the INPUT_PM8XXX_VIBRATOR
+	  driver.
+
+	  To compile this driver as module, choose M here: the
+	  module will be called qcom_pmi8998_haptics.
+
 config INPUT_SPARCSPKR
 	tristate "SPARC Speaker support"
 	depends on PCI && SPARC64
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 28dfc444f0a9..039d0a97f2f4 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY)	+= pmic8xxx-pwrkey.o
 obj-$(CONFIG_INPUT_POWERMATE)		+= powermate.o
 obj-$(CONFIG_INPUT_PWM_BEEPER)		+= pwm-beeper.o
 obj-$(CONFIG_INPUT_PWM_VIBRA)		+= pwm-vibra.o
+obj-$(CONFIG_INPUT_QCOM_PMI8998_HAPTICS)+= qcom-pmi8998-haptics.o
 obj-$(CONFIG_INPUT_RAVE_SP_PWRBUTTON)	+= rave-sp-pwrbutton.o
 obj-$(CONFIG_INPUT_RB532_BUTTON)	+= rb532_button.o
 obj-$(CONFIG_INPUT_REGULATOR_HAPTIC)	+= regulator-haptic.o
diff --git a/drivers/input/misc/qcom-pmi8998-haptics.c b/drivers/input/misc/qcom-pmi8998-haptics.c
new file mode 100644
index 000000000000..e9eec2d9de2d
--- /dev/null
+++ b/drivers/input/misc/qcom-pmi8998-haptics.c
@@ -0,0 +1,690 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022, Caleb Connolly <caleb@...nolly.tech>
+ * Qualcomm QPMI haptics driver for pmi8998 and related PMICs.
+ */
+
+#include <linux/bits.h>
+#include <linux/bitfield.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/log2.h>
+#include <linux/minmax.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/time.h>
+#include <linux/types.h>
+
+// clang-format off
+#define HAP_STATUS_1_REG		0x0A
+#define HAP_BUSY_BIT			BIT(1)
+#define SC_FLAG_BIT			BIT(3)
+#define AUTO_RES_ERROR_BIT		BIT(4)
+
+#define HAP_LRA_AUTO_RES_LO_REG		0x0B
+#define HAP_LRA_AUTO_RES_HI_REG		0x0C
+
+#define HAP_EN_CTL_REG			0x46
+#define HAP_EN_BIT			BIT(7)
+
+#define HAP_EN_CTL2_REG			0x48
+#define BRAKE_EN_BIT			BIT(0)
+
+#define HAP_AUTO_RES_CTRL_REG		0x4B
+#define AUTO_RES_EN_BIT			BIT(7)
+#define AUTO_RES_ERR_RECOVERY_BIT	BIT(3)
+#define AUTO_RES_EN_FLAG_BIT		BIT(0)
+
+#define HAP_CFG1_REG			0x4C
+#define HAP_ACT_TYPE_MASK		BIT(0)
+
+#define HAP_CFG2_REG			0x4D
+#define HAP_LRA_RES_TYPE_MASK		BIT(0)
+
+#define HAP_SEL_REG			0x4E
+#define HAP_WF_SOURCE_MASK		GENMASK(5, 4)
+#define HAP_WF_SOURCE_SHIFT		4
+
+#define HAP_LRA_AUTO_RES_REG		0x4F
+#define LRA_AUTO_RES_MODE_MASK		GENMASK(6, 4)
+#define LRA_AUTO_RES_MODE_SHIFT		4
+#define LRA_HIGH_Z_MASK			GENMASK(3, 2)
+#define LRA_HIGH_Z_SHIFT		2
+#define LRA_RES_CAL_MASK		GENMASK(1, 0)
+#define HAP_RES_CAL_PERIOD_MIN		4
+#define HAP_RES_CAL_PERIOD_MAX		32
+
+#define HAP_VMAX_CFG_REG		0x51
+#define HAP_VMAX_OVD_BIT		BIT(6)
+#define HAP_VMAX_MASK			GENMASK(5, 1)
+#define HAP_VMAX_SHIFT			1
+
+#define HAP_ILIM_CFG_REG		0x52
+#define HAP_ILIM_SEL_MASK		BIT(0)
+#define HAP_ILIM_400_MA			0
+#define HAP_ILIM_800_MA			1
+
+#define HAP_SC_DEB_REG			0x53
+#define HAP_SC_DEB_MASK			GENMASK(2, 0)
+#define HAP_SC_DEB_CYCLES_MIN		0
+#define HAP_DEF_SC_DEB_CYCLES		8
+#define HAP_SC_DEB_CYCLES_MAX		32
+
+#define HAP_RATE_CFG1_REG		0x54
+#define HAP_RATE_CFG1_MASK		GENMASK(7, 0)
+#define HAP_RATE_CFG2_SHIFT		8 // As CFG2 is the most significant byte
+
+#define HAP_RATE_CFG2_REG		0x55
+#define HAP_RATE_CFG2_MASK		GENMASK(3, 0)
+
+#define HAP_SC_CLR_REG			0x59
+#define SC_CLR_BIT			BIT(0)
+
+#define HAP_BRAKE_REG			0x5C
+#define HAP_BRAKE_PAT_MASK		0x3
+
+#define HAP_WF_REPEAT_REG		0x5E
+#define WF_REPEAT_MASK			GENMASK(6, 4)
+#define WF_REPEAT_SHIFT			4
+#define WF_REPEAT_MIN			1
+#define WF_REPEAT_MAX			128
+#define WF_S_REPEAT_MASK		GENMASK(1, 0)
+#define WF_S_REPEAT_MIN			1
+#define WF_S_REPEAT_MAX			8
+
+#define HAP_WF_S1_REG			0x60
+#define HAP_WF_SIGN_BIT			BIT(7)
+#define HAP_WF_OVD_BIT			BIT(6)
+#define HAP_WF_SAMP_MAX			GENMASK(5, 1)
+#define HAP_WF_SAMPLE_LEN		8
+
+#define HAP_PLAY_REG			0x70
+#define HAP_PLAY_BIT			BIT(7)
+#define HAP_PAUSE_BIT			BIT(0)
+
+#define HAP_SEC_ACCESS_REG		0xD0
+#define HAP_SEC_ACCESS_UNLOCK		0xA5
+
+#define HAP_TEST2_REG			0xE3
+
+
+#define HAP_VMAX_MIN_MV			116
+#define HAP_VMAX_MAX_MV			3596
+#define HAP_VMAX_MAX_MV_STRONG		3596
+
+#define HAP_WAVE_PLAY_RATE_MIN_US	0
+#define HAP_WAVE_PLAY_RATE_MAX_US	20475
+#define HAP_WAVE_PLAY_TIME_MAX_MS	15000
+
+#define AUTO_RES_ERR_POLL_TIME_NS	(20 * NSEC_PER_MSEC)
+#define HAPTICS_BACK_EMF_DELAY_US	20000
+
+#define HAP_BRAKE_PAT_LEN		4
+#define HAP_WAVE_SAMP_LEN		8
+#define NUM_WF_SET			4
+#define HAP_WAVE_SAMP_SET_LEN		(HAP_WAVE_SAMP_LEN * NUM_WF_SET)
+#define HAP_RATE_CFG_STEP_US		5
+
+#define SC_MAX_COUNT			5
+#define SC_COUNT_RST_DELAY_US		1000000
+
+// Actuator types
+#define HAP_TYPE_LRA			0
+#define HAP_TYPE_ERM			1
+
+// LRA Wave type
+#define HAP_WAVE_SINE			0
+#define HAP_WAVE_SQUARE			1
+
+// Play modes
+#define HAP_PLAY_DIRECT			0
+#define HAP_PLAY_BUFFER			1
+#define HAP_PLAY_AUDIO			2
+#define HAP_PLAY_PWM			3
+
+#define HAP_PLAY_MAX			HAP_PLAY_PWM
+
+// Auto resonance type
+#define HAP_AUTO_RES_NONE		0
+#define HAP_AUTO_RES_ZXD		1
+#define HAP_AUTO_RES_QWD		2
+#define HAP_AUTO_RES_MAX_QWD		3
+#define HAP_AUTO_RES_ZXD_EOP		4
+// clang-format on
+
+static const uint8_t default_brake_pattern[] = {
+	0x3, 0x3, 0x3, 0x3, 0x3,
+};
+
+static const uint8_t wave_sample_pattern[] = {
+	0x7e, 0x7e, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
+};
+
+/**
+ * struct spmi_haptics - struct for spmi haptics data.
+ *
+ * @dev: Our device parent.
+ * @regmap: Register map for the hardware block.
+ * @input: The input device used to receive events.
+ * @work: Work struct to play effects.
+ * @base: Base address of the regmap.
+ * @play_irq: Fired to load the next wave pattern.
+ * @sc_irq: Short circuit irq.
+ * @last_sc_time: Time since the short circuit IRQ last fired.
+ * @sc_count: Number of times the short circuit IRQ has fired in this interval.
+ * @actuator_type: The type of actuator in use.
+ * @wave_shape: The shape of the waves to use (sine or square).
+ * @play_mode: The play mode to use (direct, buffer, pwm, audio).
+ * @vmax: Max voltage to use when playing.
+ * @current_limit: The current limit for this hardware (400mA or 800mA).
+ * @play_wave_rate: The wave rate to use for this hardware.
+ * @play_lock: Lock to be held when updating the hardware state.
+ */
+struct spmi_haptics {
+	struct device *dev;
+	struct regmap *regmap;
+	struct input_dev *input;
+	struct work_struct work;
+	uint32_t base;
+
+	int play_irq;
+	int sc_irq;
+	ktime_t last_sc_time;
+	uint8_t sc_count;
+
+	uint8_t actuator_type;
+	uint8_t wave_shape;
+	uint8_t play_mode;
+	uint32_t vmax;
+	uint32_t current_limit;
+	uint32_t play_wave_rate;
+	struct mutex play_lock;
+};
+
+static int haptics_write_vmax(struct spmi_haptics *haptics)
+{
+	uint8_t val = 0;
+	uint32_t vmax_mv = haptics->vmax;
+
+	vmax_mv = clamp_t(uint32_t, vmax_mv, HAP_VMAX_MIN_MV, HAP_VMAX_MAX_MV);
+	vmax_mv = DIV_ROUND_CLOSEST(vmax_mv, HAP_VMAX_MIN_MV);
+
+	val = FIELD_PREP(HAP_VMAX_MASK, vmax_mv);
+
+	return regmap_update_bits(haptics->regmap,
+				  haptics->base + HAP_VMAX_CFG_REG,
+				  HAP_VMAX_MASK | HAP_WF_OVD_BIT, val);
+}
+
+static int haptics_module_enable(struct spmi_haptics *haptics, bool enable)
+{
+	return regmap_update_bits(haptics->regmap,
+				  haptics->base + HAP_EN_CTL_REG, HAP_EN_BIT,
+				  enable ? HAP_EN_BIT : 0);
+}
+
+static int haptics_play(struct spmi_haptics *haptics, bool play)
+{
+	return regmap_update_bits(haptics->regmap, haptics->base + HAP_PLAY_REG,
+				  HAP_PLAY_BIT | HAP_PAUSE_BIT,
+				  play ? HAP_PLAY_BIT : 0);
+}
+
+static bool is_haptics_module_enabled(struct spmi_haptics *haptics)
+{
+	uint32_t val;
+
+	regmap_read(haptics->regmap, haptics->base + HAP_EN_CTL_REG, &val);
+	return !!val;
+}
+
+/*
+ * This IRQ is fired to tell us to load the next wave sample set.
+ * As we only currently support a single sample set, it's unused.
+ */
+static irqreturn_t haptics_play_irq(int irq, void *data)
+{
+	struct spmi_haptics *haptics = data;
+
+	dev_dbg(haptics->dev, "play_irq triggered");
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Fires every ~50ms whilst the haptics are active.
+ * If the SC_FLAG_BIT is set then that means there isn't a short circuit
+ * and we just need to clear the IRQ to indicate that the device should
+ * keep vibrating.
+ *
+ * Otherwise, it means a short circuit situation has occurred.
+ */
+static irqreturn_t haptics_sc_irq(int irq, void *data)
+{
+	struct spmi_haptics *haptics = data;
+	int ret;
+	uint32_t val;
+	long sc_delta_time_us;
+	ktime_t temp;
+
+	mutex_lock(&haptics->play_lock);
+
+	ret = regmap_read(haptics->regmap, haptics->base + HAP_STATUS_1_REG,
+			  &val);
+	if (ret)
+		goto out;
+
+	if (!(val & SC_FLAG_BIT)) {
+		haptics->sc_count = 0;
+		goto out;
+	}
+
+	temp = ktime_get();
+	sc_delta_time_us = ktime_us_delta(temp, haptics->last_sc_time);
+	haptics->last_sc_time = temp;
+
+	if (sc_delta_time_us > SC_COUNT_RST_DELAY_US)
+		haptics->sc_count = 0;
+	else
+		haptics->sc_count++;
+
+	ret = regmap_update_bits(haptics->regmap,
+				 haptics->base + HAP_SC_CLR_REG, SC_CLR_BIT,
+				 SC_CLR_BIT);
+	if (ret)
+		goto out;
+
+	if (haptics->sc_count > SC_MAX_COUNT) {
+		cancel_work_sync(&haptics->work);
+		dev_err(haptics->dev,
+			"Short circuit persists, disabling haptics\n");
+		ret = haptics_module_enable(haptics, false);
+		if (ret)
+			dev_err(haptics->dev, "Error disabling module, rc=%d\n",
+				ret);
+	}
+
+out:
+	mutex_unlock(&haptics->play_lock);
+	return IRQ_HANDLED;
+}
+
+static int haptics_vibrate(struct spmi_haptics *haptics)
+{
+	int ret;
+
+	if (haptics->sc_count > SC_MAX_COUNT) {
+		dev_err(haptics->dev, "Can't play while in short circuit");
+		return -EINVAL;
+	}
+
+	ret = haptics_write_vmax(haptics);
+	if (ret)
+		return ret;
+
+	ret = haptics_module_enable(haptics, true);
+	if (ret) {
+		dev_err(haptics->dev, "Error enabling module, ret=%d\n", ret);
+		return ret;
+	}
+
+	ret = haptics_play(haptics, true);
+	if (ret) {
+		dev_err(haptics->dev, "Error enabling play, ret=%d\n", ret);
+		return ret;
+	}
+
+	return ret;
+}
+
+static int haptics_stop_vibrate(struct spmi_haptics *haptics)
+{
+	int ret;
+
+	ret = haptics_play(haptics, false);
+	if (ret) {
+		dev_err(haptics->dev, "Error disabling play, ret=%d\n", ret);
+		return ret;
+	}
+
+	ret = haptics_module_enable(haptics, false);
+	if (ret) {
+		dev_err(haptics->dev, "Error disabling module, ret=%d\n", ret);
+		return ret;
+	}
+
+	return ret;
+}
+
+static void haptics_play_stop_work(struct work_struct *work)
+{
+	struct spmi_haptics *haptics =
+		container_of(work, struct spmi_haptics, work);
+
+	int ret;
+
+	mutex_lock(&haptics->play_lock);
+
+	if (!is_haptics_module_enabled(haptics) && haptics->vmax)
+		ret = haptics_vibrate(haptics);
+	else
+		ret = haptics_stop_vibrate(haptics);
+	if (ret)
+		dev_err(haptics->dev, "Error setting haptics, ret=%d", ret);
+
+	mutex_unlock(&haptics->play_lock);
+}
+
+static int spmi_haptics_play_effect(struct input_dev *dev, void *data,
+				    struct ff_effect *effect)
+{
+	struct spmi_haptics *haptics = input_get_drvdata(dev);
+	uint32_t magnitude;
+
+	dev_dbg(haptics->dev, "%s: Rumbling with strong: %d and weak: %d",
+		 __func__, effect->u.rumble.strong_magnitude,
+		 effect->u.rumble.weak_magnitude);
+
+	magnitude = effect->u.rumble.strong_magnitude >> 8;
+	if (!magnitude)
+		magnitude = effect->u.rumble.weak_magnitude >> 10;
+
+	if (!magnitude)
+		haptics->vmax = 0;
+	else
+		haptics->vmax =
+			((HAP_VMAX_MAX_MV - HAP_VMAX_MIN_MV) * magnitude) /
+				100 +
+			HAP_VMAX_MIN_MV;
+
+	schedule_work(&haptics->work);
+
+	return 0;
+}
+
+/**
+ * spmi_haptics_close - callback for input device close
+ * @dev: input device pointer
+ *
+ * Turns off the vibrator.
+ */
+static void spmi_haptics_close(struct input_dev *dev)
+{
+	struct spmi_haptics *haptics = input_get_drvdata(dev);
+
+	cancel_work_sync(&haptics->work);
+	haptics->vmax = 0;
+
+	if (is_haptics_module_enabled(haptics))
+		haptics_stop_vibrate(haptics);
+}
+
+static int haptics_write_brake_pattern(struct spmi_haptics *haptics,
+				       const uint8_t *brake_pattern)
+{
+	int ret, i;
+	uint8_t val = 0;
+
+	for (i = HAP_BRAKE_PAT_LEN - 1; i >= 0; i--)
+		val |= FIELD_PREP(HAP_BRAKE_PAT_MASK, brake_pattern[i])
+		       << (i * 2);
+
+	ret = regmap_update_bits(haptics->regmap, haptics->base + HAP_BRAKE_REG,
+				 0xff, val);
+
+	return ret   ?:
+		       regmap_update_bits(haptics->regmap,
+					  haptics->base + HAP_EN_CTL2_REG,
+					  BRAKE_EN_BIT, BRAKE_EN_BIT);
+}
+
+static int haptics_init(struct spmi_haptics *haptics)
+{
+	int ret;
+	uint8_t val, mask;
+	uint16_t play_rate;
+
+	ret = regmap_update_bits(haptics->regmap, haptics->base + HAP_CFG1_REG,
+				 HAP_ACT_TYPE_MASK, haptics->actuator_type);
+	if (ret)
+		return ret;
+
+	/*
+	 * Configure auto resonance
+	 * see qpnp_haptics_lra_auto_res_config downstream
+	 * This is greatly simplified.
+	 */
+	val = FIELD_PREP(LRA_RES_CAL_MASK, ilog2(32 / HAP_RES_CAL_PERIOD_MIN)) |
+	      FIELD_PREP(LRA_AUTO_RES_MODE_MASK, HAP_AUTO_RES_ZXD_EOP) |
+	      FIELD_PREP(LRA_HIGH_Z_MASK, 1);
+	mask = LRA_AUTO_RES_MODE_MASK | LRA_HIGH_Z_MASK | LRA_RES_CAL_MASK;
+
+	ret = regmap_update_bits(haptics->regmap,
+				 haptics->base + HAP_LRA_AUTO_RES_REG, mask,
+				 val);
+	if (ret)
+		return ret;
+
+	val = FIELD_PREP(HAP_WF_SOURCE_MASK, haptics->play_mode);
+	ret = regmap_update_bits(haptics->regmap, haptics->base + HAP_SEL_REG,
+				 HAP_WF_SOURCE_MASK, val);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(haptics->regmap,
+				 haptics->base + HAP_ILIM_CFG_REG,
+				 HAP_ILIM_SEL_MASK, haptics->current_limit);
+	if (ret)
+		return ret;
+
+	/* Configure the debounce for short-circuit detection. */
+	ret = regmap_update_bits(haptics->regmap,
+				 haptics->base + HAP_SC_DEB_REG,
+				 HAP_SC_DEB_MASK, HAP_SC_DEB_CYCLES_MAX);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(haptics->regmap, haptics->base + HAP_CFG2_REG,
+				 HAP_LRA_RES_TYPE_MASK, haptics->wave_shape);
+	if (ret)
+		return ret;
+
+	/*
+	 * Configure RATE_CFG1 and RATE_CFG2 registers.
+	 * Note: For ERM (unsupported) these registers act as play rate and
+	 * for LRA these represent resonance period
+	 */
+	play_rate = haptics->play_wave_rate / HAP_RATE_CFG_STEP_US;
+	val = FIELD_PREP(HAP_RATE_CFG1_MASK, play_rate);
+	ret = regmap_update_bits(haptics->regmap,
+				 haptics->base + HAP_RATE_CFG1_REG,
+				 HAP_RATE_CFG1_MASK, val);
+	val = FIELD_PREP(HAP_RATE_CFG2_MASK, play_rate >> 8);
+	ret = ret   ?:
+		      regmap_update_bits(haptics->regmap,
+					 haptics->base + HAP_RATE_CFG2_REG,
+					 HAP_RATE_CFG1_MASK, val);
+	if (ret)
+		return ret;
+
+	ret = haptics_write_brake_pattern(haptics, default_brake_pattern);
+	if (ret)
+		return ret;
+
+	/* Currently this is the only supported play mode */
+	if (haptics->play_mode == HAP_PLAY_BUFFER) {
+		/* zero repeats and zero sample repeats */
+		val = FIELD_PREP(WF_REPEAT_MASK, 0) |
+		      FIELD_PREP(WF_S_REPEAT_MASK, 0);
+		ret = regmap_update_bits(haptics->regmap,
+					 haptics->base + HAP_WF_REPEAT_REG,
+					 WF_REPEAT_MASK | WF_S_REPEAT_MASK,
+					 val);
+		if (ret)
+			return ret;
+
+		ret = regmap_bulk_write(haptics->regmap,
+					haptics->base + HAP_WF_S1_REG,
+					wave_sample_pattern, HAP_WAVE_SAMP_LEN);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int spmi_haptics_probe(struct platform_device *pdev)
+{
+	struct spmi_haptics *haptics;
+	struct input_dev *input_dev;
+	int ret, irq;
+
+	haptics = devm_kzalloc(&pdev->dev, sizeof(*haptics), GFP_KERNEL);
+	if (!haptics)
+		return -ENOMEM;
+
+	haptics->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!haptics->regmap)
+		return -ENODEV;
+
+	haptics->dev = &pdev->dev;
+
+	platform_set_drvdata(pdev, haptics);
+
+	ret = device_property_read_u32(haptics->dev, "reg", &haptics->base);
+	if (ret)
+		return dev_err_probe(haptics->dev, ret,
+				     "Couldn't read base address");
+
+	/* This is the only currently supported configuration, these values
+	 * are left to allow future additions
+	 */
+	haptics->actuator_type = HAP_TYPE_LRA;
+	haptics->play_mode = HAP_PLAY_BUFFER;
+	haptics->wave_shape = HAP_WAVE_SINE;
+	haptics->current_limit = HAP_ILIM_400_MA;
+
+	ret = device_property_read_u32(haptics->dev, "qcom,wave-play-rate-us",
+				       &haptics->play_wave_rate);
+	if (ret)
+		return dev_err_probe(haptics->dev, ret,
+				     "qcom,wave-play-rate-us is required\n");
+
+	INIT_WORK(&haptics->work, haptics_play_stop_work);
+
+	ret = haptics_init(haptics);
+	if (ret)
+		return ret;
+
+	input_dev = devm_input_allocate_device(&pdev->dev);
+	if (!input_dev)
+		return -ENOMEM;
+
+	input_dev->name = "spmi_haptics";
+	input_dev->id.version = 1;
+	input_dev->close = spmi_haptics_close;
+	input_set_drvdata(input_dev, haptics);
+
+	haptics->input = input_dev;
+
+	/* In the future this should become FF_PERIODIC */
+	input_set_capability(haptics->input, EV_FF, FF_RUMBLE);
+
+	ret = input_ff_create_memless(input_dev, NULL,
+				      spmi_haptics_play_effect);
+	if (ret)
+		return dev_err_probe(
+			&pdev->dev, ret,
+			"Couldn't register haptics as EV_FF device\n");
+
+	ret = input_register_device(input_dev);
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret,
+				     "Couldn't register input device\n");
+
+	/* NOTE: the play IRQ is only used for buffer mode */
+	irq = platform_get_irq_byname(pdev, "play");
+	if (irq < 0) {
+		return dev_err_probe(&pdev->dev, irq,
+				     "Unable to get play irq\n");
+	}
+	ret = devm_request_threaded_irq(haptics->dev, irq, NULL,
+					haptics_play_irq, IRQF_ONESHOT,
+					"haptics_play_irq", haptics);
+	if (ret)
+		return dev_err_probe(haptics->dev, ret,
+				     "Couldn't request play irq\n");
+
+	irq = platform_get_irq_byname(pdev, "short");
+	if (irq < 0)
+		return dev_err_probe(&pdev->dev, irq,
+				     "Unable to get short circut irq\n");
+	ret = devm_request_threaded_irq(haptics->dev, irq, NULL, haptics_sc_irq,
+					IRQF_ONESHOT, "haptics_short_irq",
+					haptics);
+	if (ret)
+		return dev_err_probe(haptics->dev, ret,
+				     "Couldn't request short circuit irq\n");
+
+	mutex_init(&haptics->play_lock);
+
+	return 0;
+}
+
+static int __maybe_unused spmi_haptics_suspend(struct device *dev)
+{
+	struct spmi_haptics *haptics = dev_get_drvdata(dev);
+
+	cancel_work_sync(&haptics->work);
+	haptics_stop_vibrate(haptics);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(spmi_haptics_pm_ops, spmi_haptics_suspend, NULL);
+
+static int spmi_haptics_remove(struct platform_device *pdev)
+{
+	struct spmi_haptics *haptics = dev_get_drvdata(&pdev->dev);
+
+	cancel_work_sync(&haptics->work);
+	mutex_destroy(&haptics->play_lock);
+	input_unregister_device(haptics->input);
+
+	return 0;
+}
+
+static void spmi_haptics_shutdown(struct platform_device *pdev)
+{
+	struct spmi_haptics *haptics = dev_get_drvdata(&pdev->dev);
+
+	cancel_work_sync(&haptics->work);
+	haptics_stop_vibrate(haptics);
+}
+
+static const struct of_device_id spmi_haptics_match_table[] = {
+	{ .compatible = "qcom,pmi8998-haptics" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, spmi_haptics_match_table);
+
+static struct platform_driver spmi_haptics_driver = {
+	.probe		= spmi_haptics_probe,
+	.remove		= spmi_haptics_remove,
+	.shutdown	= spmi_haptics_shutdown,
+	.driver		= {
+		.name	= "spmi-haptics",
+		.pm	= &spmi_haptics_pm_ops,
+		.of_match_table = spmi_haptics_match_table,
+	},
+};
+module_platform_driver(spmi_haptics_driver);
+
+MODULE_DESCRIPTION("spmi haptics driver using ff-memless framework");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Caleb Connolly <caleb@...nolly.tech>");
--
2.38.0

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