* [PATCH 2/3] Input - aw8695: Add driver for AW8695 haptics
2026-09-14 14:37 [PATCH 0/3] AW8695 haptic driver Griffin Kroah-Hartman
2026-09-14 14:37 ` [PATCH 1/3] dt-bindings: input: Add compatibility for Awinic AW8695 Griffin Kroah-Hartman
@ 2026-09-14 14:37 ` Griffin Kroah-Hartman
2026-09-14 14:55 ` sashiko-bot
2026-09-17 8:43 ` Krzysztof Kozlowski
2026-09-14 14:37 ` [PATCH 3/3] arm64: dts: qcom: sm7225-fairphone-fp4: Add " Griffin Kroah-Hartman
2026-09-15 4:14 ` [PATCH 0/3] AW8695 haptic driver Val Packett
3 siblings, 2 replies; 11+ messages in thread
From: Griffin Kroah-Hartman @ 2026-09-14 14:37 UTC (permalink / raw)
To: Dmitry Torokhov, Rob Herring, Krzysztof Kozlowski, Conor Dooley,
Luca Weiss, Bjorn Andersson, Konrad Dybcio
Cc: linux-input, devicetree, linux-kernel, linux-arm-msm,
Griffin Kroah-Hartman
From: Luca Weiss <luca.weiss@fairphone.com>
Add a driver for interfacing with the Awinic AW8695 LRA Haptic Driver.
The chip supports multiple modes of which only RAM mode is implemented.
RTP mode would enable a user to "stream" waveform data but to my
knowledge no such user space API exists in the kernel yet.
We upload a basic sine wave to the chip and play this on request.
Co-developed-by: Griffin Kroah-Hartman <griffin.kroah@fairphone.com>
Signed-off-by: Griffin Kroah-Hartman <griffin.kroah@fairphone.com>
Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
---
drivers/input/misc/Kconfig | 11 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/aw8695.c | 753 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 765 insertions(+)
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 1f6c57dba030813c248c068eda26ca1842271cb2..8bc0fdc1a7bc4c1fb1bea69ed08dcd6002a7d5fe 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -137,6 +137,17 @@ config INPUT_AW86927
To compile this driver as a module, choose M here: the
module will be called aw86927.
+config INPUT_AW8695
+ tristate "Awinic AW8695 haptics support"
+ depends on INPUT && I2C
+ select INPUT_FF_MEMLESS
+ select REGMAP_I2C
+ help
+ Say Y to enable support for the Awinic AW8695 haptics driver.
+
+ To compile this driver as a module, choose M here: the module will
+ be called aw8695.
+
config INPUT_BBNSM_PWRKEY
tristate "NXP BBNSM Power Key Driver"
depends on ARCH_MXC || COMPILE_TEST
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 2281d6803fce92e54a05c2c4f57ee7f7ea7ef2b8..25fb845125f9bee5b808d3f3b8ee74b9e89af5f5 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_INPUT_ATI_REMOTE2) += ati_remote2.o
obj-$(CONFIG_INPUT_ATLAS_BTNS) += atlas_btns.o
obj-$(CONFIG_INPUT_ATMEL_CAPTOUCH) += atmel_captouch.o
obj-$(CONFIG_INPUT_AW86927) += aw86927.o
+obj-$(CONFIG_INPUT_AW8695) += aw8695.o
obj-$(CONFIG_INPUT_BBNSM_PWRKEY) += nxp-bbnsm-pwrkey.o
obj-$(CONFIG_INPUT_BMA150) += bma150.o
obj-$(CONFIG_INPUT_CM109) += cm109.o
diff --git a/drivers/input/misc/aw8695.c b/drivers/input/misc/aw8695.c
new file mode 100644
index 0000000000000000000000000000000000000000..ea72562a7c2a7c4ab82e535a9cce2224623b5ffa
--- /dev/null
+++ b/drivers/input/misc/aw8695.c
@@ -0,0 +1,753 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2026 Luca Weiss <luca.weiss@fairphone.com>
+ * Copyright (C) 2026 Griffin Kroah-Hartman <griffin.kroah@fairphone.com>
+ *
+ * Partially based on vendor driver:
+ * Copyright (c) 2018 AWINIC Technology CO., LTD
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#define AW8695_CHIPID 0x95
+#define AW8695_RESET 0xaa
+/* Default of BASE_ADDR* registers */
+#define AW8695_RAM_BASE_ADDR 0x800
+
+#define AW8695_HIGH_MASK GENMASK(15, 8)
+#define AW8695_LOW_MASK GENMASK(7, 0)
+
+/* Chip ID */
+#define AW8695_ID_REG 0x00
+
+/* System Status */
+#define AW8695_SYSST_REG 0x01
+
+/* System Interrupt */
+#define AW8695_SYSINT_REG 0x02
+#define AW8695_SYSINT_BSTERRI BIT(7)
+#define AW8695_SYSINT_OVI BIT(6)
+#define AW8695_SYSINT_UVLI BIT(5)
+#define AW8695_SYSINT_FF_AEI BIT(4)
+#define AW8695_SYSINT_FF_AFI BIT(3)
+#define AW8695_SYSINT_OCDI BIT(2)
+#define AW8695_SYSINT_OTI BIT(1)
+#define AW8695_SYSINT_DONEI BIT(0)
+
+/* System Interrupt Mask */
+#define AW8695_SYSINTM_REG 0x03
+#define AW8695_SYSINTM_BSTERR_OFF BIT(7)
+#define AW8695_SYSINTM_OV_OFF BIT(6)
+#define AW8695_SYSINTM_UVLO_OFF BIT(5)
+#define AW8695_SYSINTM_OCD_OFF BIT(2)
+#define AW8695_SYSINTM_OT_OFF BIT(1)
+
+/* System Control */
+#define AW8695_SYSCTRL_REG 0x04
+#define AW8695_SYSCTRL_RAMINIT_EN BIT(5)
+
+#define AW8695_SYSCTRL_PLAY_MODE_MASK GENMASK(3, 2)
+#define AW8695_SYSCTRL_PLAY_MODE_RAM (0)
+
+#define AW8695_SYSCTRL_BST_MODE_MASK GENMASK(1, 1)
+#define AW8695_SYSCTRL_BST_MODE_BYPASS (0)
+
+#define AW8695_SYSCTRL_WORK_MODE_MASK GENMASK(0, 0)
+#define AW8695_SYSCTRL_STANDBY (1)
+#define AW8695_SYSCTRL_ACTIVE (0)
+
+/* Process Control */
+#define AW8695_GO_REG 0x05
+#define AW8695_GO_ENABLE BIT(0)
+
+/* Waveform #1 */
+#define AW8695_WAVSEQ1_REG 0x07
+
+/* Waveform #2 */
+#define AW8695_WAVSEQ2_REG 0x08
+
+/* Waveform Loop #1 */
+#define AW8695_WAVLOOP1_REG 0x0f
+#define AW8695_WAVLOOP1_SEQ1_MASK GENMASK(7, 4)
+#define AW8695_WAVLOOP1_SEQ2_MASK GENMASK(3, 0)
+
+#define AW8695_WAVLOOP_INFINITE 0xf
+
+/* Debug Control */
+#define AW8695_DBGCTRL_REG 0x20
+#define AW8695_DBGCTRL_INT_MODE_MASK GENMASK(2, 2)
+#define AW8695_DBGCTRL_INT_MODE_EDGE (1)
+
+/* PWM Output Protect Configuration */
+#define AW8695_PWMPRC_REG 0x2d
+#define AW8695_PWMPRC_PRC_ENABLE BIT(7)
+
+/* PWM Debug */
+#define AW8695_PWMDBG_REG 0x2e
+#define AW8695_PWMDBG_PWM_MODE_MASK GENMASK(6, 5)
+#define AW8695_PWMDBG_PWM_24K (2)
+
+/* Debug Status */
+#define AW8695_DBGSTAT_REG 0x30
+
+/* Boost Debug #1 */
+#define AW8695_BSTDBG1_REG 0x31
+#define AW8695_BSTDBG1_DEFAULT 0x30
+
+/* Boost Debug #2 */
+#define AW8695_BSTDBG2_REG 0x32
+#define AW8695_BSTDBG2_DEFAULT 0xeb
+
+/* Boost Debug #3 */
+#define AW8695_BSTDBG3_REG 0x33
+#define AW8695_BSTDBG3_DEFAULT 0xd4
+
+/* Boost Config */
+#define AW8695_BSTCFG_REG 0x34
+#define AW8695_BSTCFG_PEAKCUR_MASK GENMASK(2, 0)
+#define AW8695_BSTCFG_PEAKCUR_2A (1)
+
+#define AW8695_ANADBG_REG 0x35
+#define AW8695_ANADBG_IOC_MASK GENMASK(3, 2)
+#define AW8695_ANADBG_IOC_4P65A (3)
+
+/* Waveform Protect Level */
+#define AW8695_PRLVL_REG 0x3e
+#define AW8695_PRLVL_PR_ENABLE BIT(7)
+
+/* SRAM Address 0xhigh */
+#define AW8695_RAMADDRH_REG 0x40
+
+/* SRAM Address 0xlow */
+#define AW8695_RAMADDRL_REG 0x41
+
+/* SRAM Data */
+#define AW8695_RAMDATA_REG 0x42
+
+#define AW8695_GLB_STATE_REG 0x46
+
+#define AW8695_BST_AUTO_REG 0x47
+#define AW8695_BST_AUTO_BST_AUTOSW_MASK GENMASK(2, 2)
+#define AW8695_BST_AUTO_BST_MANUAL_BOOST (0)
+
+#define AW8695_TSET_REG 0x4d
+#define AW8695_TSET_DEFAULT 0x12
+
+#define AW8695_R_SPARE_REG 0x5d
+#define Aw8695_R_SPARE_DEFAULT 0x68
+
+/* Detection Control */
+#define AW8695_DETCTRL_REG 0x5f
+#define AW8695_DETCTRL_PROTECT_MASK GENMASK(5, 5)
+#define AW8695_DETCTRL_PROTECT_NO_ACTION (1)
+#define AW8695_DETCTRL_DIAG_GO_ENABLE BIT(0)
+
+/* ADC Test */
+#define AW8695_ADCTEST_REG 0x66
+#define AW8695_ADCTEST_VBAT_MODE_MASK GENMASK(6, 6)
+#define AW8695_ADCTEST_VBAT_HW_COMP (1)
+
+#define AW8695_BEMF_VTHH_H_REG 0x74
+
+#define AW8695_BEMF_VTHH_L_REG 0x75
+
+#define AW8695_BEMF_VTHL_H_REG 0x76
+
+#define AW8695_BEMF_VTHL_L_REG 0x77
+
+#define AW8695_MAX_REG 0x7f
+
+#define AW8695_BEMF_UPPER_THRESHOLD 0x1008
+#define AW8695_BEMF_LOWER_THRESHOLD 0x3f8
+
+enum aw8695_work_mode {
+ AW8695_STANDBY_MODE,
+ AW8695_RAM_MODE,
+};
+
+struct aw8695_data {
+ struct input_dev *input_dev;
+ struct i2c_client *client;
+ struct regmap *regmap;
+ struct gpio_desc *reset_gpio;
+ u16 level;
+ struct work_struct play_work;
+};
+
+/*
+ * Sine wave representing the magnitude of the drive to be used.
+ * Data is encoded in two's complement.
+ * round(84 * sin(x / 16.25))
+ */
+static const u8 aw8695_sine_waveform[] = {
+ 0x00, 0x05, 0x0a, 0x0f, 0x14, 0x19, 0x1e, 0x23, 0x28, 0x2c, 0x30, 0x35,
+ 0x39, 0x3c, 0x40, 0x43, 0x46, 0x49, 0x4b, 0x4d, 0x4f, 0x51, 0x52, 0x53,
+ 0x54, 0x54, 0x54, 0x54, 0x53, 0x52, 0x51, 0x4f, 0x4d, 0x4b, 0x49, 0x46,
+ 0x43, 0x40, 0x3c, 0x39, 0x35, 0x31, 0x2c, 0x28, 0x23, 0x1f, 0x1a, 0x15,
+ 0x10, 0x0b, 0x05, 0x00, 0xfb, 0xf6, 0xf1, 0xec, 0xe7, 0xe2, 0xdd, 0xd9,
+ 0xd4, 0xd0, 0xcc, 0xc8, 0xc4, 0xc0, 0xbd, 0xba, 0xb7, 0xb5, 0xb3, 0xb1,
+ 0xaf, 0xae, 0xad, 0xac, 0xac, 0xac, 0xac, 0xad, 0xae, 0xaf, 0xb1, 0xb2,
+ 0xb5, 0xb7, 0xba, 0xbd, 0xc0, 0xc3, 0xc7, 0xcb, 0xcf, 0xd3, 0xd8, 0xdc,
+ 0xe1, 0xe6, 0xeb, 0xf0, 0xf5, 0xfa
+};
+
+/*
+ * Header that gets written to AW8695 SRAM that describes the available
+ * waveforms being transferred afterwards.
+ *
+ * @version: waveform library version
+ * @start_address: start address of waveform in SRAM
+ * @end_address: end address of waveform in SRAM
+ */
+struct aw8695_sram_waveform_header {
+ u8 version;
+ __be16 start_address;
+ __be16 end_address;
+} __packed;
+
+static const struct aw8695_sram_waveform_header sram_waveform_header = {
+ .version = 0x01,
+ .start_address = cpu_to_be16(AW8695_RAM_BASE_ADDR +
+ sizeof(struct aw8695_sram_waveform_header)),
+ .end_address = cpu_to_be16(AW8695_RAM_BASE_ADDR +
+ sizeof(struct aw8695_sram_waveform_header) +
+ ARRAY_SIZE(aw8695_sine_waveform) - 1),
+};
+
+static int aw8695_interrupt_clear(struct aw8695_data *haptics)
+{
+ unsigned int read_buf;
+
+ /* Clear UVLI bit by reading register */
+ return regmap_read(haptics->regmap, AW8695_SYSINT_REG, &read_buf);
+}
+
+static int aw8695_haptic_set_active(struct aw8695_data *haptics)
+{
+ int err;
+
+ err = regmap_update_bits(haptics->regmap, AW8695_SYSCTRL_REG,
+ AW8695_SYSCTRL_WORK_MODE_MASK,
+ FIELD_PREP(AW8695_SYSCTRL_WORK_MODE_MASK,
+ AW8695_SYSCTRL_ACTIVE));
+ if (err)
+ return err;
+
+ err = aw8695_interrupt_clear(haptics);
+ if (err)
+ return err;
+
+ return regmap_update_bits(haptics->regmap, AW8695_SYSINTM_REG,
+ AW8695_SYSINTM_UVLO_OFF, 0);
+}
+
+static int aw8695_play_mode(struct aw8695_data *haptics,
+ enum aw8695_work_mode mode)
+{
+ struct device *dev = &haptics->client->dev;
+ int err;
+
+ switch (mode) {
+ case AW8695_STANDBY_MODE:
+ err = regmap_update_bits(haptics->regmap, AW8695_SYSINTM_REG,
+ AW8695_SYSINTM_UVLO_OFF, AW8695_SYSINTM_UVLO_OFF);
+ if (err)
+ return err;
+
+ return regmap_update_bits(haptics->regmap, AW8695_SYSCTRL_REG,
+ AW8695_SYSCTRL_WORK_MODE_MASK,
+ FIELD_PREP(AW8695_SYSCTRL_WORK_MODE_MASK,
+ AW8695_SYSCTRL_STANDBY));
+ case AW8695_RAM_MODE:
+ err = regmap_update_bits(haptics->regmap, AW8695_SYSCTRL_REG,
+ AW8695_SYSCTRL_PLAY_MODE_MASK,
+ FIELD_PREP(AW8695_SYSCTRL_PLAY_MODE_MASK,
+ AW8695_SYSCTRL_PLAY_MODE_RAM));
+ if (err)
+ return err;
+
+ err = regmap_update_bits(haptics->regmap, AW8695_SYSCTRL_REG,
+ AW8695_SYSCTRL_BST_MODE_MASK,
+ FIELD_PREP(AW8695_SYSCTRL_BST_MODE_MASK,
+ AW8695_SYSCTRL_BST_MODE_BYPASS));
+ if (err)
+ return err;
+
+ return aw8695_haptic_set_active(haptics);
+ default:
+ dev_err(dev, "Unhandled mode: %d\n", mode);
+ return -EINVAL;
+ }
+}
+
+static int aw8695_haptics_play(struct input_dev *dev, void *data,
+ struct ff_effect *effect)
+{
+ struct aw8695_data *haptics = input_get_drvdata(dev);
+ int level;
+
+ level = effect->u.rumble.strong_magnitude;
+ if (!level)
+ level = effect->u.rumble.weak_magnitude;
+
+ if (haptics->level == level)
+ return 0;
+
+ haptics->level = level;
+ schedule_work(&haptics->play_work);
+
+ return 0;
+}
+
+static void aw8695_hw_reset(struct aw8695_data *haptics)
+{
+ gpiod_set_value_cansleep(haptics->reset_gpio, 1);
+
+ usleep_range(1000, 2000);
+
+ gpiod_set_value_cansleep(haptics->reset_gpio, 0);
+
+ usleep_range(3500, 4000);
+}
+
+static int aw8695_stop(struct aw8695_data *haptics)
+{
+ int err;
+ unsigned int read_buf;
+ struct device *dev = &haptics->client->dev;
+
+ err = regmap_update_bits(haptics->regmap, AW8695_GO_REG,
+ AW8695_GO_ENABLE, 0);
+ if (err)
+ return err;
+
+ err = regmap_read_poll_timeout(haptics->regmap, AW8695_GLB_STATE_REG, read_buf,
+ (read_buf & 0x0f) == 0, 2000, 2000 * 100);
+ if (err) {
+ dev_err(dev, "Did not enter standby: %d\n Trying to force it...\n", err);
+ err = aw8695_play_mode(haptics, AW8695_STANDBY_MODE);
+ return err;
+ }
+
+ return aw8695_play_mode(haptics, AW8695_STANDBY_MODE);
+}
+
+static int aw8695_play_sine(struct aw8695_data *haptics)
+{
+ int err;
+
+ err = aw8695_stop(haptics);
+ if (err)
+ return err;
+
+ /*
+ * Configure for waveform #1 to be played infinitely,
+ * and waveform #2 to not be played.
+ */
+ err = regmap_write(haptics->regmap, AW8695_WAVSEQ1_REG, 0x1);
+ if (err)
+ return err;
+
+ err = regmap_write(haptics->regmap, AW8695_WAVSEQ2_REG, 0x0);
+ if (err)
+ return err;
+
+ err = regmap_write(haptics->regmap, AW8695_WAVLOOP1_REG,
+ FIELD_PREP(AW8695_WAVLOOP1_SEQ1_MASK,
+ AW8695_WAVLOOP_INFINITE) |
+ FIELD_PREP(AW8695_WAVLOOP1_SEQ2_MASK, 0));
+ if (err)
+ return err;
+
+ /* Configure for RAM mode */
+ err = aw8695_play_mode(haptics, AW8695_RAM_MODE);
+ if (err)
+ return err;
+
+ /* Start vibration */
+ return regmap_update_bits(haptics->regmap, AW8695_GO_REG,
+ AW8695_GO_ENABLE, AW8695_GO_ENABLE);
+}
+
+static void aw8695_close(struct input_dev *input)
+{
+ struct aw8695_data *haptics = input_get_drvdata(input);
+ struct device *dev = &haptics->client->dev;
+ int err;
+
+ cancel_work_sync(&haptics->play_work);
+ err = aw8695_stop(haptics);
+ if (err)
+ dev_err(dev, "Failed to stop haptics: %d\n", err);
+}
+
+static void aw8695_haptics_play_work(struct work_struct *work)
+{
+ struct aw8695_data *haptics =
+ container_of(work, struct aw8695_data, play_work);
+ struct device *dev = &haptics->client->dev;
+ int err;
+
+ if (haptics->level)
+ err = aw8695_play_sine(haptics);
+ else
+ err = aw8695_stop(haptics);
+
+ if (err)
+ dev_err(dev, "Failed to execute work command: %d\n", err);
+}
+
+static int aw8695_haptic_offset_calibration(struct aw8695_data *haptics)
+{
+ unsigned int read_buf;
+ int err;
+
+ err = regmap_update_bits(haptics->regmap, AW8695_SYSCTRL_REG,
+ AW8695_SYSCTRL_RAMINIT_EN,
+ AW8695_SYSCTRL_RAMINIT_EN);
+ if (err)
+ return err;
+
+ err = regmap_update_bits(haptics->regmap, AW8695_DETCTRL_REG,
+ AW8695_DETCTRL_DIAG_GO_ENABLE,
+ AW8695_DETCTRL_DIAG_GO_ENABLE);
+ if (err)
+ return err;
+
+ err = regmap_read_poll_timeout(haptics->regmap, AW8695_DETCTRL_REG, read_buf,
+ (read_buf & AW8695_DETCTRL_DIAG_GO_ENABLE) == 0, 10000, 10000 * 50);
+ if (err)
+ return err;
+
+ return regmap_update_bits(haptics->regmap, AW8695_SYSCTRL_REG,
+ AW8695_SYSCTRL_RAMINIT_EN, 0);
+}
+
+static int aw8695_init(struct aw8695_data *haptics)
+{
+ int err;
+ unsigned int read_buf;
+ struct device *dev = &haptics->client->dev;
+
+ aw8695_hw_reset(haptics);
+
+ err = regmap_read(haptics->regmap, AW8695_ID_REG, &read_buf);
+ if (err) {
+ dev_err(dev, "Failed to read ID register: %d\n", err);
+ return err;
+ }
+
+ if (read_buf != AW8695_CHIPID) {
+ dev_err(dev, "Chip ID mismatch: expected %x, got %x\n",
+ AW8695_CHIPID, read_buf);
+ return -ENODEV;
+ }
+
+ err = regmap_write(haptics->regmap, AW8695_ID_REG, AW8695_RESET);
+ if (err) {
+ dev_err(dev, "Failed to reset: %d\n", err);
+ return err;
+ }
+
+ /* Wait ~1ms after reset */
+ usleep_range(1000, 1500);
+
+ /* Clear UVLI bit by reading register */
+ err = aw8695_interrupt_clear(haptics);
+ if (err) {
+ dev_err(dev, "Failed to clear interrupt: %d\n", err);
+ return err;
+ }
+
+ /* Set interrupt mode to edge */
+ err = regmap_update_bits(haptics->regmap, AW8695_DBGCTRL_REG,
+ AW8695_DBGCTRL_INT_MODE_MASK,
+ FIELD_PREP(AW8695_DBGCTRL_INT_MODE_MASK,
+ AW8695_DBGCTRL_INT_MODE_EDGE));
+ if (err) {
+ dev_err(dev, "Failed to set interrupt mode: %d\n", err);
+ return err;
+ }
+
+ /* Configure interrupts */
+ err = regmap_update_bits(haptics->regmap, AW8695_SYSINTM_REG,
+ AW8695_SYSINTM_BSTERR_OFF | AW8695_SYSINTM_OV_OFF |
+ AW8695_SYSINTM_UVLO_OFF | AW8695_SYSINTM_OCD_OFF |
+ AW8695_SYSINTM_OT_OFF,
+ AW8695_SYSINTM_BSTERR_OFF);
+ if (err)
+ return err;
+
+ err = aw8695_play_mode(haptics, AW8695_STANDBY_MODE);
+ if (err)
+ return err;
+
+ err = regmap_update_bits(haptics->regmap, AW8695_PWMDBG_REG,
+ AW8695_PWMDBG_PWM_MODE_MASK,
+ FIELD_PREP(AW8695_PWMDBG_PWM_MODE_MASK,
+ AW8695_PWMDBG_PWM_24K));
+ if (err)
+ return err;
+
+ err = regmap_write(haptics->regmap, AW8695_BSTDBG1_REG, AW8695_BSTDBG1_DEFAULT);
+ if (err)
+ return err;
+ err = regmap_write(haptics->regmap, AW8695_BSTDBG2_REG, AW8695_BSTDBG2_DEFAULT);
+ if (err)
+ return err;
+ err = regmap_write(haptics->regmap, AW8695_BSTDBG3_REG, AW8695_BSTDBG3_DEFAULT);
+ if (err)
+ return err;
+ err = regmap_write(haptics->regmap, AW8695_TSET_REG, AW8695_TSET_DEFAULT);
+ if (err)
+ return err;
+ err = regmap_write(haptics->regmap, AW8695_R_SPARE_REG, Aw8695_R_SPARE_DEFAULT);
+ if (err)
+ return err;
+
+ err = regmap_update_bits(haptics->regmap, AW8695_ANADBG_REG,
+ AW8695_ANADBG_IOC_MASK,
+ FIELD_PREP(AW8695_ANADBG_IOC_MASK,
+ AW8695_ANADBG_IOC_4P65A));
+ if (err)
+ return err;
+
+ /* Set boost peak current */
+ err = regmap_update_bits(haptics->regmap, AW8695_BSTCFG_REG,
+ AW8695_BSTCFG_PEAKCUR_MASK,
+ FIELD_PREP(AW8695_BSTCFG_PEAKCUR_MASK,
+ AW8695_BSTCFG_PEAKCUR_2A));
+ if (err)
+ return err;
+
+ /* Adjust motorprotect config */
+ err = regmap_update_bits(haptics->regmap, AW8695_DETCTRL_REG,
+ AW8695_DETCTRL_PROTECT_MASK,
+ FIELD_PREP(AW8695_DETCTRL_PROTECT_MASK,
+ AW8695_DETCTRL_PROTECT_NO_ACTION));
+ if (err)
+ return err;
+ err = regmap_update_bits(haptics->regmap, AW8695_PWMPRC_REG,
+ AW8695_PWMPRC_PRC_ENABLE, 0);
+ if (err)
+ return err;
+ err = regmap_update_bits(haptics->regmap, AW8695_PRLVL_REG,
+ AW8695_PRLVL_PR_ENABLE, 0);
+ if (err)
+ return err;
+
+ /* Adjust auto boost config */
+ err = regmap_update_bits(haptics->regmap, AW8695_BST_AUTO_REG,
+ AW8695_BST_AUTO_BST_AUTOSW_MASK,
+ FIELD_PREP(AW8695_BST_AUTO_BST_AUTOSW_MASK,
+ AW8695_BST_AUTO_BST_MANUAL_BOOST));
+ if (err)
+ return err;
+
+ err = aw8695_haptic_offset_calibration(haptics);
+ if (err)
+ return err;
+
+ /* Set vbat compensation mode */
+ err = regmap_update_bits(haptics->regmap, AW8695_ADCTEST_REG,
+ AW8695_ADCTEST_VBAT_MODE_MASK,
+ FIELD_PREP(AW8695_ADCTEST_VBAT_MODE_MASK,
+ AW8695_ADCTEST_VBAT_HW_COMP));
+ if (err)
+ return err;
+
+ /* bemf config */
+ err = regmap_write(haptics->regmap, AW8695_BEMF_VTHH_H_REG,
+ FIELD_GET(AW8695_HIGH_MASK, AW8695_BEMF_UPPER_THRESHOLD));
+ if (err)
+ return err;
+ err = regmap_write(haptics->regmap, AW8695_BEMF_VTHH_L_REG,
+ FIELD_GET(AW8695_LOW_MASK, AW8695_BEMF_UPPER_THRESHOLD));
+ if (err)
+ return err;
+ err = regmap_write(haptics->regmap, AW8695_BEMF_VTHL_H_REG,
+ FIELD_GET(AW8695_HIGH_MASK, AW8695_BEMF_LOWER_THRESHOLD));
+ if (err)
+ return err;
+ return regmap_write(haptics->regmap, AW8695_BEMF_VTHL_L_REG,
+ FIELD_GET(AW8695_LOW_MASK, AW8695_BEMF_LOWER_THRESHOLD));
+}
+
+static int aw8695_ram_init(struct aw8695_data *haptics)
+{
+ int err;
+
+ /* Enable SRAM init */
+ err = regmap_update_bits(haptics->regmap, AW8695_SYSCTRL_REG,
+ AW8695_SYSCTRL_RAMINIT_EN, AW8695_SYSCTRL_RAMINIT_EN);
+ if (err)
+ return err;
+
+ /* Set RAMDATA write address */
+ err = regmap_write(haptics->regmap, AW8695_RAMADDRH_REG,
+ FIELD_GET(AW8695_HIGH_MASK, AW8695_RAM_BASE_ADDR));
+ if (err)
+ return err;
+ err = regmap_write(haptics->regmap, AW8695_RAMADDRL_REG,
+ FIELD_GET(AW8695_LOW_MASK, AW8695_RAM_BASE_ADDR));
+ if (err)
+ return err;
+
+ err = regmap_noinc_write(haptics->regmap, AW8695_RAMDATA_REG,
+ &sram_waveform_header, sizeof(sram_waveform_header));
+ if (err)
+ return err;
+
+ err = regmap_noinc_write(haptics->regmap, AW8695_RAMDATA_REG,
+ aw8695_sine_waveform, ARRAY_SIZE(aw8695_sine_waveform));
+ if (err)
+ return err;
+
+ /* Disable SRAM init */
+ return regmap_update_bits(haptics->regmap, AW8695_SYSCTRL_REG,
+ AW8695_SYSCTRL_RAMINIT_EN, 0);
+}
+
+static irqreturn_t aw8695_irq(int irq, void *data)
+{
+ struct aw8695_data *haptics = data;
+ struct device *dev = &haptics->client->dev;
+ unsigned int read_buf;
+ int err;
+
+ err = regmap_read(haptics->regmap, AW8695_SYSINT_REG, &read_buf);
+ if (err) {
+ dev_err(dev, "Failed to read SYSINT register: %d\n", err);
+ return IRQ_NONE;
+ }
+ dev_dbg(dev, "Interrupt: SYSINT=0x%x\n", read_buf);
+
+ if (read_buf & AW8695_SYSINT_BSTERRI)
+ dev_err(dev, "Received boost short circuit protection or over-voltage protection interrupt!\n");
+ if (read_buf & AW8695_SYSINT_OVI)
+ dev_err(dev, "Received wave data overflow or DPWM DC error interrupt!\n");
+ if (read_buf & AW8695_SYSINT_UVLI)
+ dev_err(dev, "Received under voltage lock out interrupt!\n");
+ if (read_buf & AW8695_SYSINT_OCDI)
+ dev_err(dev, "Received over current interrupt!\n");
+ if (read_buf & AW8695_SYSINT_OTI)
+ dev_err(dev, "Received over temperature interrupt!\n");
+
+ if (read_buf & AW8695_SYSINT_DONEI)
+ dev_dbg(dev, "Received playback done interrupt\n");
+ /* FIFO mode is not (yet) implemented in this driver */
+ if (read_buf & AW8695_SYSINT_FF_AEI)
+ dev_dbg(dev, "Received FIFO almost empty interrupt\n");
+ if (read_buf & AW8695_SYSINT_FF_AFI)
+ dev_dbg(dev, "Received FIFO almost full interrupt\n");
+
+ err = regmap_read(haptics->regmap, AW8695_DBGSTAT_REG, &read_buf);
+ if (err) {
+ dev_err(dev, "Failed to read DBGSTAT register: %d\n", err);
+ return IRQ_NONE;
+ }
+ dev_dbg(dev, "Interrupt: DBGSTAT=0x%x\n", read_buf);
+
+ err = regmap_read(haptics->regmap, AW8695_SYSST_REG, &read_buf);
+ if (err) {
+ dev_err(dev, "Failed to read SYSST register: %d\n", err);
+ return IRQ_NONE;
+ }
+ dev_dbg(dev, "Interrupt: SYSST=0x%x\n", read_buf);
+
+ return IRQ_HANDLED;
+}
+
+static const struct regmap_config aw8695_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .max_register = AW8695_MAX_REG,
+ .cache_type = REGCACHE_NONE,
+};
+
+static int aw8695_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct aw8695_data *haptics;
+ int err;
+
+ haptics = devm_kzalloc(dev, sizeof(*haptics), GFP_KERNEL);
+ if (!haptics)
+ return -ENOMEM;
+
+ haptics->client = client;
+ i2c_set_clientdata(client, haptics);
+
+ haptics->regmap = devm_regmap_init_i2c(client, &aw8695_regmap_config);
+ if (IS_ERR(haptics->regmap))
+ return dev_err_probe(dev, PTR_ERR(haptics->regmap),
+ "Failed to allocate register map\n");
+
+ haptics->input_dev = devm_input_allocate_device(dev);
+ if (!haptics->input_dev)
+ return -ENOMEM;
+
+ haptics->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(haptics->reset_gpio))
+ return dev_err_probe(dev, PTR_ERR(haptics->reset_gpio),
+ "Failed to get reset gpio\n");
+
+ err = devm_request_threaded_irq(dev, client->irq, NULL, aw8695_irq,
+ IRQF_ONESHOT, NULL, haptics);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to request interrupt\n");
+
+ INIT_WORK(&haptics->play_work, aw8695_haptics_play_work);
+
+ haptics->input_dev->name = "aw8695";
+ haptics->input_dev->close = aw8695_close;
+
+ input_set_drvdata(haptics->input_dev, haptics);
+ input_set_capability(haptics->input_dev, EV_FF, FF_RUMBLE);
+
+ err = input_ff_create_memless(haptics->input_dev, NULL,
+ aw8695_haptics_play);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to create FF dev\n");
+
+ err = aw8695_init(haptics);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to init aw8695\n");
+
+ err = aw8695_ram_init(haptics);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to init aw8695 sram\n");
+
+ err = input_register_device(haptics->input_dev);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to register input device\n");
+
+ return 0;
+}
+
+static const struct of_device_id aw8695_of_id[] = {
+ { .compatible = "awinic,aw8695", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, aw8695_of_id);
+
+static struct i2c_driver aw8695_driver = {
+ .driver = {
+ .name = "aw8695",
+ .of_match_table = aw8695_of_id,
+ },
+ .probe = aw8695_probe,
+};
+
+module_i2c_driver(aw8695_driver);
+
+MODULE_AUTHOR("Luca Weiss <luca.weiss@fairphone.com>");
+MODULE_DESCRIPTION("AW8695 LRA Haptic Driver");
+MODULE_LICENSE("GPL");
--
2.43.0
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