Quelle  da7280.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0+
/*
 * DA7280 Haptic device driver
 *
 * Copyright (c) 2020 Dialog Semiconductor.
 * Author: Roy Im <Roy.Im.Opensource@diasemi.com>
 */

#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pwm.h>
#include <linux/regmap.h>
#include <linux/workqueue.h>
#include <linux/uaccess.h>

/* Registers */
#define DA7280_IRQ_EVENT1   0x03
#define DA7280_IRQ_EVENT_WARNING_DIAG  0x04
#define DA7280_IRQ_EVENT_SEQ_DIAG  0x05
#define DA7280_IRQ_STATUS1   0x06
#define DA7280_IRQ_MASK1   0x07
#define DA7280_FRQ_LRA_PER_H   0x0A
#define DA7280_FRQ_LRA_PER_L   0x0B
#define DA7280_ACTUATOR1   0x0C
#define DA7280_ACTUATOR2   0x0D
#define DA7280_ACTUATOR3   0x0E
#define DA7280_CALIB_V2I_H   0x0F
#define DA7280_CALIB_V2I_L   0x10
#define DA7280_TOP_CFG1    0x13
#define DA7280_TOP_CFG2    0x14
#define DA7280_TOP_CFG4    0x16
#define DA7280_TOP_INT_CFG1   0x17
#define DA7280_TOP_CTL1    0x22
#define DA7280_TOP_CTL2    0x23
#define DA7280_SEQ_CTL2    0x28
#define DA7280_GPI_0_CTL   0x29
#define DA7280_GPI_1_CTL   0x2A
#define DA7280_GPI_2_CTL   0x2B
#define DA7280_MEM_CTL1    0x2C
#define DA7280_MEM_CTL2    0x2D
#define DA7280_TOP_CFG5    0x6E
#define DA7280_IRQ_MASK2   0x83
#define DA7280_SNP_MEM_99   0xE7

/* Register field */

/* DA7280_IRQ_EVENT1 (Address 0x03) */
#define DA7280_E_SEQ_CONTINUE_MASK  BIT(0)
#define DA7280_E_UVLO_MASK   BIT(1)
#define DA7280_E_SEQ_DONE_MASK   BIT(2)
#define DA7280_E_OVERTEMP_CRIT_MASK  BIT(3)
#define DA7280_E_SEQ_FAULT_MASK   BIT(4)
#define DA7280_E_WARNING_MASK   BIT(5)
#define DA7280_E_ACTUATOR_FAULT_MASK  BIT(6)
#define DA7280_E_OC_FAULT_MASK   BIT(7)

/* DA7280_IRQ_EVENT_WARNING_DIAG (Address 0x04) */
#define DA7280_E_OVERTEMP_WARN_MASK             BIT(3)
#define DA7280_E_MEM_TYPE_MASK                  BIT(4)
#define DA7280_E_LIM_DRIVE_ACC_MASK             BIT(6)
#define DA7280_E_LIM_DRIVE_MASK                 BIT(7)

/* DA7280_IRQ_EVENT_PAT_DIAG (Address 0x05) */
#define DA7280_E_PWM_FAULT_MASK   BIT(5)
#define DA7280_E_MEM_FAULT_MASK   BIT(6)
#define DA7280_E_SEQ_ID_FAULT_MASK  BIT(7)

/* DA7280_IRQ_STATUS1 (Address 0x06) */
#define DA7280_STA_SEQ_CONTINUE_MASK  BIT(0)
#define DA7280_STA_UVLO_VBAT_OK_MASK  BIT(1)
#define DA7280_STA_SEQ_DONE_MASK  BIT(2)
#define DA7280_STA_OVERTEMP_CRIT_MASK  BIT(3)
#define DA7280_STA_SEQ_FAULT_MASK  BIT(4)
#define DA7280_STA_WARNING_MASK   BIT(5)
#define DA7280_STA_ACTUATOR_MASK  BIT(6)
#define DA7280_STA_OC_MASK   BIT(7)

/* DA7280_IRQ_MASK1 (Address 0x07) */
#define DA7280_SEQ_CONTINUE_M_MASK  BIT(0)
#define DA7280_E_UVLO_M_MASK   BIT(1)
#define DA7280_SEQ_DONE_M_MASK   BIT(2)
#define DA7280_OVERTEMP_CRIT_M_MASK  BIT(3)
#define DA7280_SEQ_FAULT_M_MASK   BIT(4)
#define DA7280_WARNING_M_MASK   BIT(5)
#define DA7280_ACTUATOR_M_MASK   BIT(6)
#define DA7280_OC_M_MASK   BIT(7)

/* DA7280_ACTUATOR3 (Address 0x0e) */
#define DA7280_IMAX_MASK   GENMASK(4, 0)

/* DA7280_TOP_CFG1 (Address 0x13) */
#define DA7280_AMP_PID_EN_MASK   BIT(0)
#define DA7280_RAPID_STOP_EN_MASK  BIT(1)
#define DA7280_ACCELERATION_EN_MASK  BIT(2)
#define DA7280_FREQ_TRACK_EN_MASK  BIT(3)
#define DA7280_BEMF_SENSE_EN_MASK  BIT(4)
#define DA7280_ACTUATOR_TYPE_MASK  BIT(5)

/* DA7280_TOP_CFG2 (Address 0x14) */
#define DA7280_FULL_BRAKE_THR_MASK  GENMASK(3, 0)
#define DA7280_MEM_DATA_SIGNED_MASK  BIT(4)

/* DA7280_TOP_CFG4 (Address 0x16) */
#define DA7280_TST_CALIB_IMPEDANCE_DIS_MASK BIT(6)
#define DA7280_V2I_FACTOR_FREEZE_MASK  BIT(7)

/* DA7280_TOP_INT_CFG1 (Address 0x17) */
#define DA7280_BEMF_FAULT_LIM_MASK  GENMASK(1, 0)

/* DA7280_TOP_CTL1 (Address 0x22) */
#define DA7280_OPERATION_MODE_MASK  GENMASK(2, 0)
#define DA7280_STANDBY_EN_MASK   BIT(3)
#define DA7280_SEQ_START_MASK   BIT(4)

/* DA7280_SEQ_CTL2 (Address 0x28) */
#define DA7280_PS_SEQ_ID_MASK   GENMASK(3, 0)
#define DA7280_PS_SEQ_LOOP_MASK   GENMASK(7, 4)

/* DA7280_GPIO_0_CTL (Address 0x29) */
#define DA7280_GPI0_POLARITY_MASK  GENMASK(1, 0)
#define DA7280_GPI0_MODE_MASK   BIT(2)
#define DA7280_GPI0_SEQUENCE_ID_MASK  GENMASK(6, 3)

/* DA7280_GPIO_1_CTL (Address 0x2a) */
#define DA7280_GPI1_POLARITY_MASK  GENMASK(1, 0)
#define DA7280_GPI1_MODE_MASK   BIT(2)
#define DA7280_GPI1_SEQUENCE_ID_MASK  GENMASK(6, 3)

/* DA7280_GPIO_2_CTL (Address 0x2b) */
#define DA7280_GPI2_POLARITY_MASK  GENMASK(1, 0)
#define DA7280_GPI2_MODE_MASK   BIT(2)
#define DA7280_GPI2_SEQUENCE_ID_MASK  GENMASK(6, 3)

/* DA7280_MEM_CTL2 (Address 0x2d) */
#define DA7280_WAV_MEM_LOCK_MASK  BIT(7)

/* DA7280_TOP_CFG5 (Address 0x6e) */
#define DA7280_V2I_FACTOR_OFFSET_EN_MASK BIT(0)

/* DA7280_IRQ_MASK2 (Address 0x83) */
#define DA7280_ADC_SAT_M_MASK   BIT(7)

/* Controls */

#define DA7280_VOLTAGE_RATE_MAX   6000000
#define DA7280_VOLTAGE_RATE_STEP  23400
#define DA7280_NOMMAX_DFT   0x6B
#define DA7280_ABSMAX_DFT   0x78

#define DA7280_IMPD_MAX    1500000000
#define DA7280_IMPD_DEFAULT   22000000

#define DA7280_IMAX_DEFAULT   0x0E
#define DA7280_IMAX_STEP   7200
#define DA7280_IMAX_LIMIT   252000

#define DA7280_RESONT_FREQH_DFT   0x39
#define DA7280_RESONT_FREQL_DFT   0x32
#define DA7280_MIN_RESONAT_FREQ_HZ  50
#define DA7280_MAX_RESONAT_FREQ_HZ  300

#define DA7280_SEQ_ID_MAX   15
#define DA7280_SEQ_LOOP_MAX   15
#define DA7280_GPI_SEQ_ID_DFT   0
#define DA7280_GPI_SEQ_ID_MAX   2

#define DA7280_SNP_MEM_SIZE   100
#define DA7280_SNP_MEM_MAX   DA7280_SNP_MEM_99

#define DA7280_IRQ_NUM    3

#define DA7280_SKIP_INIT   0x100

#define DA7280_FF_EFFECT_COUNT_MAX  15

/* Maximum gain is 0x7fff for PWM mode */
#define DA7280_MAX_MAGNITUDE_SHIFT  15

enum da7280_haptic_dev_t {
 DA7280_LRA = 0,
 DA7280_ERM_BAR = 1,
 DA7280_ERM_COIN = 2,
 DA7280_DEV_MAX,
};

enum da7280_op_mode {
 DA7280_INACTIVE  = 0,
 DA7280_DRO_MODE  = 1,
 DA7280_PWM_MODE  = 2,
 DA7280_RTWM_MODE = 3,
 DA7280_ETWM_MODE = 4,
 DA7280_OPMODE_MAX,
};

#define DA7280_FF_CONSTANT_DRO   1
#define DA7280_FF_PERIODIC_PWM   2
#define DA7280_FF_PERIODIC_RTWM   1
#define DA7280_FF_PERIODIC_ETWM   2

#define DA7280_FF_PERIODIC_MODE   DA7280_RTWM_MODE
#define DA7280_FF_CONSTANT_MODE   DA7280_DRO_MODE

enum da7280_custom_effect_param {
 DA7280_CUSTOM_SEQ_ID_IDX = 0,
 DA7280_CUSTOM_SEQ_LOOP_IDX = 1,
 DA7280_CUSTOM_DATA_LEN  = 2,
};

enum da7280_custom_gpi_effect_param {
 DA7280_CUSTOM_GPI_SEQ_ID_IDX = 0,
 DA7280_CUSTOM_GPI_NUM_IDX = 2,
 DA7280_CUSTOM_GP_DATA_LEN = 3,
};

struct da7280_gpi_ctl {
 u8 seq_id;
 u8 mode;
 u8 polarity;
};

struct da7280_haptic {
 struct regmap *regmap;
 struct input_dev *input_dev;
 struct device *dev;
 struct i2c_client *client;
 struct pwm_device *pwm_dev;

 struct work_struct work;
 int val;
 u16 gain;
 s16 level;

 u8 dev_type;
 u8 op_mode;
 u8 const_op_mode;
 u8 periodic_op_mode;
 u16 nommax;
 u16 absmax;
 u32 imax;
 u32 impd;
 u32 resonant_freq_h;
 u32 resonant_freq_l;
 bool bemf_sense_en;
 bool freq_track_en;
 bool acc_en;
 bool rapid_stop_en;
 bool amp_pid_en;
 u8 ps_seq_id;
 u8 ps_seq_loop;
 struct da7280_gpi_ctl gpi_ctl[3];
 bool mem_update;
 u8 snp_mem[DA7280_SNP_MEM_SIZE];
 bool active;
 bool suspended;
};

static bool da7280_volatile_register(struct device *dev, unsigned int reg)
{
 switch (reg) {
 case DA7280_IRQ_EVENT1:
 case DA7280_IRQ_EVENT_WARNING_DIAG:
 case DA7280_IRQ_EVENT_SEQ_DIAG:
 case DA7280_IRQ_STATUS1:
 case DA7280_TOP_CTL1:
  return true;
 default:
  return false;
 }
}

static const struct regmap_config da7280_haptic_regmap_config = {
 .reg_bits = 8,
 .val_bits = 8,
 .max_register = DA7280_SNP_MEM_MAX,
 .volatile_reg = da7280_volatile_register,
};

static int da7280_haptic_mem_update(struct da7280_haptic *haptics)
{
 unsigned int val;
 int error;

 /* The patterns should be updated when haptic is not working */
 error = regmap_read(haptics->regmap, DA7280_IRQ_STATUS1, &val);
 if (error)
  return error;
 if (val & DA7280_STA_WARNING_MASK) {
  dev_warn(haptics->dev,
    "Warning! Please check HAPTIC status.\n");
  return -EBUSY;
 }

 /* Patterns are not updated if the lock bit is enabled */
 val = 0;
 error = regmap_read(haptics->regmap, DA7280_MEM_CTL2, &val);
 if (error)
  return error;
 if (~val & DA7280_WAV_MEM_LOCK_MASK) {
  dev_warn(haptics->dev, "Please unlock the bit first\n");
  return -EACCES;
 }

 /* Set to Inactive mode to make sure safety */
 error = regmap_update_bits(haptics->regmap,
       DA7280_TOP_CTL1,
       DA7280_OPERATION_MODE_MASK,
       0);
 if (error)
  return error;

 error = regmap_read(haptics->regmap, DA7280_MEM_CTL1, &val);
 if (error)
  return error;

 return regmap_bulk_write(haptics->regmap, val, haptics->snp_mem,
     DA7280_SNP_MEM_MAX - val + 1);
}

static int da7280_haptic_set_pwm(struct da7280_haptic *haptics, bool enabled)
{
 struct pwm_state state;
 u64 period_mag_multi;
 int error;

 if (!haptics->gain && enabled) {
  dev_err(haptics->dev, "Unable to enable pwm with 0 gain\n");
  return -EINVAL;
 }

 pwm_get_state(haptics->pwm_dev, &state);
 state.enabled = enabled;
 if (enabled) {
  period_mag_multi = (u64)state.period * haptics->gain;
  period_mag_multi >>= DA7280_MAX_MAGNITUDE_SHIFT;

  /*
 * The interpretation of duty cycle depends on the acc_en,
 * it should be between 50% and 100% for acc_en = 0.
 * See datasheet 'PWM mode' section.
 */
  if (!haptics->acc_en) {
   period_mag_multi += state.period;
   period_mag_multi /= 2;
  }

  state.duty_cycle = period_mag_multi;
 }

 error = pwm_apply_might_sleep(haptics->pwm_dev, &state);
 if (error)
  dev_err(haptics->dev, "Failed to apply pwm state: %d\n", error);

 return error;
}

static void da7280_haptic_activate(struct da7280_haptic *haptics)
{
 int error;

 if (haptics->active)
  return;

 switch (haptics->op_mode) {
 case DA7280_DRO_MODE:
  /* the valid range check when acc_en is enabled */
  if (haptics->acc_en && haptics->level > 0x7F)
   haptics->level = 0x7F;
  else if (haptics->level > 0xFF)
   haptics->level = 0xFF;

  /* Set level as a % of ACTUATOR_NOMMAX (nommax) */
  error = regmap_write(haptics->regmap, DA7280_TOP_CTL2,
         haptics->level);
  if (error) {
   dev_err(haptics->dev,
    "Failed to set level to %d: %d\n",
    haptics->level, error);
   return;
  }
  break;

 case DA7280_PWM_MODE:
  if (da7280_haptic_set_pwm(haptics, true))
   return;
  break;

 case DA7280_RTWM_MODE:
  /*
 * The pattern will be played by the PS_SEQ_ID and the
 * PS_SEQ_LOOP
 */
  break;

 case DA7280_ETWM_MODE:
  /*
 * The pattern will be played by the GPI[N] state,
 * GPI(N)_SEQUENCE_ID and the PS_SEQ_LOOP. See the
 * datasheet for the details.
 */
  break;

 default:
  dev_err(haptics->dev, "Invalid op mode %d\n", haptics->op_mode);
  return;
 }

 error = regmap_update_bits(haptics->regmap,
       DA7280_TOP_CTL1,
       DA7280_OPERATION_MODE_MASK,
       haptics->op_mode);
 if (error) {
  dev_err(haptics->dev,
   "Failed to set operation mode: %d", error);
  return;
 }

 if (haptics->op_mode == DA7280_PWM_MODE ||
     haptics->op_mode == DA7280_RTWM_MODE) {
  error = regmap_update_bits(haptics->regmap,
        DA7280_TOP_CTL1,
        DA7280_SEQ_START_MASK,
        DA7280_SEQ_START_MASK);
  if (error) {
   dev_err(haptics->dev,
    "Failed to start sequence: %d\n", error);
   return;
  }
 }

 haptics->active = true;
}

static void da7280_haptic_deactivate(struct da7280_haptic *haptics)
{
 int error;

 if (!haptics->active)
  return;

 /* Set to Inactive mode */
 error = regmap_update_bits(haptics->regmap,
       DA7280_TOP_CTL1,
       DA7280_OPERATION_MODE_MASK, 0);
 if (error) {
  dev_err(haptics->dev,
   "Failed to clear operation mode: %d", error);
  return;
 }

 switch (haptics->op_mode) {
 case DA7280_DRO_MODE:
  error = regmap_write(haptics->regmap,
         DA7280_TOP_CTL2, 0);
  if (error) {
   dev_err(haptics->dev,
    "Failed to disable DRO mode: %d\n", error);
   return;
  }
  break;

 case DA7280_PWM_MODE:
  if (da7280_haptic_set_pwm(haptics, false))
   return;
  break;

 case DA7280_RTWM_MODE:
 case DA7280_ETWM_MODE:
  error = regmap_update_bits(haptics->regmap,
        DA7280_TOP_CTL1,
        DA7280_SEQ_START_MASK, 0);
  if (error) {
   dev_err(haptics->dev,
    "Failed to disable RTWM/ETWM mode: %d\n",
    error);
   return;
  }
  break;

 default:
  dev_err(haptics->dev, "Invalid op mode %d\n", haptics->op_mode);
  return;
 }

 haptics->active = false;
}

static void da7280_haptic_work(struct work_struct *work)
{
 struct da7280_haptic *haptics =
  container_of(work, struct da7280_haptic, work);
 int val = haptics->val;

 if (val)
  da7280_haptic_activate(haptics);
 else
  da7280_haptic_deactivate(haptics);
}

static int da7280_haptics_upload_effect(struct input_dev *dev,
     struct ff_effect *effect,
     struct ff_effect *old)
{
 struct da7280_haptic *haptics = input_get_drvdata(dev);
 s16 data[DA7280_SNP_MEM_SIZE] = { 0 };
 unsigned int val;
 int tmp, i, num;
 int error;

 /* The effect should be uploaded when haptic is not working */
 if (haptics->active)
  return -EBUSY;

 switch (effect->type) {
 /* DRO/PWM modes support this type */
 case FF_CONSTANT:
  haptics->op_mode = haptics->const_op_mode;
  if (haptics->op_mode == DA7280_DRO_MODE) {
   tmp = effect->u.constant.level * 254;
   haptics->level = tmp / 0x7FFF;
   break;
  }

  haptics->gain = effect->u.constant.level <= 0 ?
     0 : effect->u.constant.level;
  break;

 /* RTWM/ETWM modes support this type */
 case FF_PERIODIC:
  if (effect->u.periodic.waveform != FF_CUSTOM) {
   dev_err(haptics->dev,
    "Device can only accept FF_CUSTOM waveform\n");
   return -EINVAL;
  }

  /*
 * Load the data and check the length.
 * the data will be patterns in this case: 4 < X <= 100,
 * and will be saved into the waveform memory inside DA728x.
 * If X = 2, the data will be PS_SEQ_ID and PS_SEQ_LOOP.
 * If X = 3, the 1st data will be GPIX_SEQUENCE_ID .
 */
  if (effect->u.periodic.custom_len == DA7280_CUSTOM_DATA_LEN)
   goto set_seq_id_loop;

  if (effect->u.periodic.custom_len == DA7280_CUSTOM_GP_DATA_LEN)
   goto set_gpix_seq_id;

  if (effect->u.periodic.custom_len < DA7280_CUSTOM_DATA_LEN ||
      effect->u.periodic.custom_len > DA7280_SNP_MEM_SIZE) {
   dev_err(haptics->dev, "Invalid waveform data size\n");
   return -EINVAL;
  }

  if (copy_from_user(data, effect->u.periodic.custom_data,
       sizeof(s16) *
       effect->u.periodic.custom_len))
   return -EFAULT;

  memset(haptics->snp_mem, 0, DA7280_SNP_MEM_SIZE);

  for (i = 0; i < effect->u.periodic.custom_len; i++) {
   if (data[i] < 0 || data[i] > 0xff) {
    dev_err(haptics->dev,
     "Invalid waveform data %d at offset %d\n",
     data[i], i);
    return -EINVAL;
   }
   haptics->snp_mem[i] = (u8)data[i];
  }

  error = da7280_haptic_mem_update(haptics);
  if (error) {
   dev_err(haptics->dev,
    "Failed to upload waveform: %d\n", error);
   return error;
  }
  break;

set_seq_id_loop:
  if (copy_from_user(data, effect->u.periodic.custom_data,
       sizeof(s16) * DA7280_CUSTOM_DATA_LEN))
   return -EFAULT;

  if (data[DA7280_CUSTOM_SEQ_ID_IDX] < 0 ||
      data[DA7280_CUSTOM_SEQ_ID_IDX] > DA7280_SEQ_ID_MAX ||
      data[DA7280_CUSTOM_SEQ_LOOP_IDX] < 0 ||
      data[DA7280_CUSTOM_SEQ_LOOP_IDX] > DA7280_SEQ_LOOP_MAX) {
   dev_err(haptics->dev,
    "Invalid custom id (%d) or loop (%d)\n",
    data[DA7280_CUSTOM_SEQ_ID_IDX],
    data[DA7280_CUSTOM_SEQ_LOOP_IDX]);
   return -EINVAL;
  }

  haptics->ps_seq_id = data[DA7280_CUSTOM_SEQ_ID_IDX] & 0x0f;
  haptics->ps_seq_loop = data[DA7280_CUSTOM_SEQ_LOOP_IDX] & 0x0f;
  haptics->op_mode = haptics->periodic_op_mode;

  val = FIELD_PREP(DA7280_PS_SEQ_ID_MASK, haptics->ps_seq_id) |
   FIELD_PREP(DA7280_PS_SEQ_LOOP_MASK,
       haptics->ps_seq_loop);
  error = regmap_write(haptics->regmap, DA7280_SEQ_CTL2, val);
  if (error) {
   dev_err(haptics->dev,
    "Failed to update PS sequence: %d\n", error);
   return error;
  }
  break;

set_gpix_seq_id:
  if (copy_from_user(data, effect->u.periodic.custom_data,
       sizeof(s16) * DA7280_CUSTOM_GP_DATA_LEN))
   return -EFAULT;

  if (data[DA7280_CUSTOM_GPI_SEQ_ID_IDX] < 0 ||
      data[DA7280_CUSTOM_GPI_SEQ_ID_IDX] > DA7280_SEQ_ID_MAX ||
      data[DA7280_CUSTOM_GPI_NUM_IDX] < 0 ||
      data[DA7280_CUSTOM_GPI_NUM_IDX] > DA7280_GPI_SEQ_ID_MAX) {
   dev_err(haptics->dev,
    "Invalid custom GPI id (%d) or num (%d)\n",
    data[DA7280_CUSTOM_GPI_SEQ_ID_IDX],
    data[DA7280_CUSTOM_GPI_NUM_IDX]);
   return -EINVAL;
  }

  num = data[DA7280_CUSTOM_GPI_NUM_IDX] & 0x0f;
  haptics->gpi_ctl[num].seq_id =
   data[DA7280_CUSTOM_GPI_SEQ_ID_IDX] & 0x0f;
  haptics->op_mode = haptics->periodic_op_mode;

  val = FIELD_PREP(DA7280_GPI0_SEQUENCE_ID_MASK,
     haptics->gpi_ctl[num].seq_id);
  error = regmap_update_bits(haptics->regmap,
        DA7280_GPI_0_CTL + num,
        DA7280_GPI0_SEQUENCE_ID_MASK,
        val);
  if (error) {
   dev_err(haptics->dev,
    "Failed to update GPI sequence: %d\n", error);
   return error;
  }
  break;

 default:
  dev_err(haptics->dev, "Unsupported effect type: %d\n",
   effect->type);
  return -EINVAL;
 }

 return 0;
}

static int da7280_haptics_playback(struct input_dev *dev,
       int effect_id, int val)
{
 struct da7280_haptic *haptics = input_get_drvdata(dev);

 if (!haptics->op_mode) {
  dev_warn(haptics->dev, "No effects have been uploaded\n");
  return -EINVAL;
 }

 if (likely(!haptics->suspended)) {
  haptics->val = val;
  schedule_work(&haptics->work);
 }

 return 0;
}

static int da7280_haptic_start(struct da7280_haptic *haptics)
{
 int error;

 error = regmap_update_bits(haptics->regmap,
       DA7280_TOP_CTL1,
       DA7280_STANDBY_EN_MASK,
       DA7280_STANDBY_EN_MASK);
 if (error) {
  dev_err(haptics->dev, "Unable to enable device: %d\n", error);
  return error;
 }

 return 0;
}

static void da7280_haptic_stop(struct da7280_haptic *haptics)
{
 int error;

 cancel_work_sync(&haptics->work);


 da7280_haptic_deactivate(haptics);

 error = regmap_update_bits(haptics->regmap, DA7280_TOP_CTL1,
       DA7280_STANDBY_EN_MASK, 0);
 if (error)
  dev_err(haptics->dev, "Failed to disable device: %d\n", error);
}

static int da7280_haptic_open(struct input_dev *dev)
{
 struct da7280_haptic *haptics = input_get_drvdata(dev);

 return da7280_haptic_start(haptics);
}

static void da7280_haptic_close(struct input_dev *dev)
{
 struct da7280_haptic *haptics = input_get_drvdata(dev);

 da7280_haptic_stop(haptics);
}

static u8 da7280_haptic_of_mode_str(struct device *dev,
        const char *str)
{
 if (!strcmp(str, "LRA")) {
  return DA7280_LRA;
 } else if (!strcmp(str, "ERM-bar")) {
  return DA7280_ERM_BAR;
 } else if (!strcmp(str, "ERM-coin")) {
  return DA7280_ERM_COIN;
 } else {
  dev_warn(dev, "Invalid string - set to LRA\n");
  return DA7280_LRA;
 }
}

static u8 da7280_haptic_of_gpi_mode_str(struct device *dev,
     const char *str)
{
 if (!strcmp(str, "Single-pattern")) {
  return 0;
 } else if (!strcmp(str, "Multi-pattern")) {
  return 1;
 } else {
  dev_warn(dev, "Invalid string - set to Single-pattern\n");
  return 0;
 }
}

static u8 da7280_haptic_of_gpi_pol_str(struct device *dev,
           const char *str)
{
 if (!strcmp(str, "Rising-edge")) {
  return 0;
 } else if (!strcmp(str, "Falling-edge")) {
  return 1;
 } else if (!strcmp(str, "Both-edge")) {
  return 2;
 } else {
  dev_warn(dev, "Invalid string - set to Rising-edge\n");
  return 0;
 }
}

static u8 da7280_haptic_of_volt_rating_set(u32 val)
{
 u32 voltage = val / DA7280_VOLTAGE_RATE_STEP + 1;

 return min_t(u32, voltage, 0xff);
}

static void da7280_parse_properties(struct device *dev,
        struct da7280_haptic *haptics)
{
 unsigned int i, mem[DA7280_SNP_MEM_SIZE];
 char gpi_str1[] = "dlg,gpi0-seq-id";
 char gpi_str2[] = "dlg,gpi0-mode";
 char gpi_str3[] = "dlg,gpi0-polarity";
 const char *str;
 u32 val;
 int error;

 /*
 * If there is no property, then use the mode programmed into the chip.
 */
 haptics->dev_type = DA7280_DEV_MAX;
 error = device_property_read_string(dev, "dlg,actuator-type", &str);
 if (!error)
  haptics->dev_type = da7280_haptic_of_mode_str(dev, str);

 haptics->const_op_mode = DA7280_DRO_MODE;
 error = device_property_read_u32(dev, "dlg,const-op-mode", &val);
 if (!error && val == DA7280_FF_PERIODIC_PWM)
  haptics->const_op_mode = DA7280_PWM_MODE;

 haptics->periodic_op_mode = DA7280_RTWM_MODE;
 error = device_property_read_u32(dev, "dlg,periodic-op-mode", &val);
 if (!error && val == DA7280_FF_PERIODIC_ETWM)
  haptics->periodic_op_mode = DA7280_ETWM_MODE;

 haptics->nommax = DA7280_SKIP_INIT;
 error = device_property_read_u32(dev, "dlg,nom-microvolt", &val);
 if (!error && val < DA7280_VOLTAGE_RATE_MAX)
  haptics->nommax = da7280_haptic_of_volt_rating_set(val);

 haptics->absmax = DA7280_SKIP_INIT;
 error = device_property_read_u32(dev, "dlg,abs-max-microvolt", &val);
 if (!error && val < DA7280_VOLTAGE_RATE_MAX)
  haptics->absmax = da7280_haptic_of_volt_rating_set(val);

 haptics->imax = DA7280_IMAX_DEFAULT;
 error = device_property_read_u32(dev, "dlg,imax-microamp", &val);
 if (!error && val < DA7280_IMAX_LIMIT)
  haptics->imax = (val - 28600) / DA7280_IMAX_STEP + 1;

 haptics->impd = DA7280_IMPD_DEFAULT;
 error = device_property_read_u32(dev, "dlg,impd-micro-ohms", &val);
 if (!error && val <= DA7280_IMPD_MAX)
  haptics->impd = val;

 haptics->resonant_freq_h = DA7280_SKIP_INIT;
 haptics->resonant_freq_l = DA7280_SKIP_INIT;
 error = device_property_read_u32(dev, "dlg,resonant-freq-hz", &val);
 if (!error) {
  if (val < DA7280_MAX_RESONAT_FREQ_HZ &&
      val > DA7280_MIN_RESONAT_FREQ_HZ) {
   haptics->resonant_freq_h =
    ((1000000000 / (val * 1333)) >> 7) & 0xFF;
   haptics->resonant_freq_l =
    (1000000000 / (val * 1333)) & 0x7F;
  } else {
   haptics->resonant_freq_h = DA7280_RESONT_FREQH_DFT;
   haptics->resonant_freq_l = DA7280_RESONT_FREQL_DFT;
  }
 }

 /* If no property, set to zero as default is to do nothing. */
 haptics->ps_seq_id = 0;
 error = device_property_read_u32(dev, "dlg,ps-seq-id", &val);
 if (!error && val <= DA7280_SEQ_ID_MAX)
  haptics->ps_seq_id = val;

 haptics->ps_seq_loop = 0;
 error = device_property_read_u32(dev, "dlg,ps-seq-loop", &val);
 if (!error && val <= DA7280_SEQ_LOOP_MAX)
  haptics->ps_seq_loop = val;

 /* GPI0~2 Control */
 for (i = 0; i <= DA7280_GPI_SEQ_ID_MAX; i++) {
  gpi_str1[7] = '0' + i;
  haptics->gpi_ctl[i].seq_id = DA7280_GPI_SEQ_ID_DFT + i;
  error = device_property_read_u32 (dev, gpi_str1, &val);
  if (!error && val <= DA7280_SEQ_ID_MAX)
   haptics->gpi_ctl[i].seq_id = val;

  gpi_str2[7] = '0' + i;
  haptics->gpi_ctl[i].mode = 0;
  error = device_property_read_string(dev, gpi_str2, &str);
  if (!error)
   haptics->gpi_ctl[i].mode =
    da7280_haptic_of_gpi_mode_str(dev, str);

  gpi_str3[7] = '0' + i;
  haptics->gpi_ctl[i].polarity = 0;
  error = device_property_read_string(dev, gpi_str3, &str);
  if (!error)
   haptics->gpi_ctl[i].polarity =
    da7280_haptic_of_gpi_pol_str(dev, str);
 }

 haptics->bemf_sense_en =
  device_property_read_bool(dev, "dlg,bemf-sens-enable");
 haptics->freq_track_en =
  device_property_read_bool(dev, "dlg,freq-track-enable");
 haptics->acc_en =
  device_property_read_bool(dev, "dlg,acc-enable");
 haptics->rapid_stop_en =
  device_property_read_bool(dev, "dlg,rapid-stop-enable");
 haptics->amp_pid_en =
  device_property_read_bool(dev, "dlg,amp-pid-enable");

 haptics->mem_update = false;
 error = device_property_read_u32_array(dev, "dlg,mem-array",
            &mem[0], DA7280_SNP_MEM_SIZE);
 if (!error) {
  haptics->mem_update = true;
  memset(haptics->snp_mem, 0, DA7280_SNP_MEM_SIZE);
  for (i = 0; i < DA7280_SNP_MEM_SIZE; i++) {
   if (mem[i] <= 0xff) {
    haptics->snp_mem[i] = (u8)mem[i];
   } else {
    dev_err(haptics->dev,
     "Invalid data in mem-array at %d: %x\n",
     i, mem[i]);
    haptics->mem_update = false;
    break;
   }
  }
 }
}

static irqreturn_t da7280_irq_handler(int irq, void *data)
{
 struct da7280_haptic *haptics = data;
 struct device *dev = haptics->dev;
 u8 events[DA7280_IRQ_NUM];
 int error;

 /* Check what events have happened */
 error = regmap_bulk_read(haptics->regmap, DA7280_IRQ_EVENT1,
     events, sizeof(events));
 if (error) {
  dev_err(dev, "failed to read interrupt data: %d\n", error);
  goto out;
 }

 /* Clear events */
 error = regmap_write(haptics->regmap, DA7280_IRQ_EVENT1, events[0]);
 if (error) {
  dev_err(dev, "failed to clear interrupts: %d\n", error);
  goto out;
 }

 if (events[0] & DA7280_E_SEQ_FAULT_MASK) {
  /*
 * Stop first if haptic is active, otherwise, the fault may
 * happen continually even though the bit is cleared.
 */
  error = regmap_update_bits(haptics->regmap, DA7280_TOP_CTL1,
        DA7280_OPERATION_MODE_MASK, 0);
  if (error)
   dev_err(dev, "failed to clear op mode on fault: %d\n",
    error);
 }

 if (events[0] & DA7280_E_SEQ_DONE_MASK)
  haptics->active = false;

 if (events[0] & DA7280_E_WARNING_MASK) {
  if (events[1] & DA7280_E_LIM_DRIVE_MASK ||
      events[1] & DA7280_E_LIM_DRIVE_ACC_MASK)
   dev_warn(dev, "Please reduce the driver level\n");
  if (events[1] & DA7280_E_MEM_TYPE_MASK)
   dev_warn(dev, "Please check the mem data format\n");
  if (events[1] & DA7280_E_OVERTEMP_WARN_MASK)
   dev_warn(dev, "Over-temperature warning\n");
 }

 if (events[0] & DA7280_E_SEQ_FAULT_MASK) {
  if (events[2] & DA7280_E_SEQ_ID_FAULT_MASK)
   dev_info(dev, "Please reload PS_SEQ_ID & mem data\n");
  if (events[2] & DA7280_E_MEM_FAULT_MASK)
   dev_info(dev, "Please reload the mem data\n");
  if (events[2] & DA7280_E_PWM_FAULT_MASK)
   dev_info(dev, "Please restart PWM interface\n");
 }

out:
 return IRQ_HANDLED;
}

static int da7280_init(struct da7280_haptic *haptics)
{
 unsigned int val = 0;
 u32 v2i_factor;
 int error, i;
 u8 mask = 0;

 /*
 * If device type is DA7280_DEV_MAX then simply use currently
 * programmed mode.
 */
 if (haptics->dev_type == DA7280_DEV_MAX) {
  error = regmap_read(haptics->regmap, DA7280_TOP_CFG1, &val);
  if (error)
   goto out_err;

  haptics->dev_type = val & DA7280_ACTUATOR_TYPE_MASK ?
     DA7280_ERM_COIN : DA7280_LRA;
 }

 /* Apply user settings */
 if (haptics->dev_type == DA7280_LRA &&
     haptics->resonant_freq_l != DA7280_SKIP_INIT) {
  error = regmap_write(haptics->regmap, DA7280_FRQ_LRA_PER_H,
         haptics->resonant_freq_h);
  if (error)
   goto out_err;
  error = regmap_write(haptics->regmap, DA7280_FRQ_LRA_PER_L,
         haptics->resonant_freq_l);
  if (error)
   goto out_err;
 } else if (haptics->dev_type == DA7280_ERM_COIN) {
  error = regmap_update_bits(haptics->regmap, DA7280_TOP_INT_CFG1,
        DA7280_BEMF_FAULT_LIM_MASK, 0);
  if (error)
   goto out_err;

  mask = DA7280_TST_CALIB_IMPEDANCE_DIS_MASK |
   DA7280_V2I_FACTOR_FREEZE_MASK;
  val = DA7280_TST_CALIB_IMPEDANCE_DIS_MASK |
   DA7280_V2I_FACTOR_FREEZE_MASK;
  error = regmap_update_bits(haptics->regmap, DA7280_TOP_CFG4,
        mask, val);
  if (error)
   goto out_err;

  haptics->acc_en = false;
  haptics->rapid_stop_en = false;
  haptics->amp_pid_en = false;
 }

 mask = DA7280_ACTUATOR_TYPE_MASK |
   DA7280_BEMF_SENSE_EN_MASK |
   DA7280_FREQ_TRACK_EN_MASK |
   DA7280_ACCELERATION_EN_MASK |
   DA7280_RAPID_STOP_EN_MASK |
   DA7280_AMP_PID_EN_MASK;
 val = FIELD_PREP(DA7280_ACTUATOR_TYPE_MASK,
    (haptics->dev_type ? 1 : 0)) |
  FIELD_PREP(DA7280_BEMF_SENSE_EN_MASK,
      (haptics->bemf_sense_en ? 1 : 0)) |
  FIELD_PREP(DA7280_FREQ_TRACK_EN_MASK,
      (haptics->freq_track_en ? 1 : 0)) |
  FIELD_PREP(DA7280_ACCELERATION_EN_MASK,
      (haptics->acc_en ? 1 : 0)) |
  FIELD_PREP(DA7280_RAPID_STOP_EN_MASK,
      (haptics->rapid_stop_en ? 1 : 0)) |
  FIELD_PREP(DA7280_AMP_PID_EN_MASK,
      (haptics->amp_pid_en ? 1 : 0));

 error = regmap_update_bits(haptics->regmap, DA7280_TOP_CFG1, mask, val);
 if (error)
  goto out_err;

 error = regmap_update_bits(haptics->regmap, DA7280_TOP_CFG5,
       DA7280_V2I_FACTOR_OFFSET_EN_MASK,
       haptics->acc_en ?
     DA7280_V2I_FACTOR_OFFSET_EN_MASK : 0);
 if (error)
  goto out_err;

 error = regmap_update_bits(haptics->regmap,
       DA7280_TOP_CFG2,
       DA7280_MEM_DATA_SIGNED_MASK,
       haptics->acc_en ?
     0 : DA7280_MEM_DATA_SIGNED_MASK);
 if (error)
  goto out_err;

 if (haptics->nommax != DA7280_SKIP_INIT) {
  error = regmap_write(haptics->regmap, DA7280_ACTUATOR1,
         haptics->nommax);
  if (error)
   goto out_err;
 }

 if (haptics->absmax != DA7280_SKIP_INIT) {
  error = regmap_write(haptics->regmap, DA7280_ACTUATOR2,
         haptics->absmax);
  if (error)
   goto out_err;
 }

 error = regmap_update_bits(haptics->regmap, DA7280_ACTUATOR3,
       DA7280_IMAX_MASK, haptics->imax);
 if (error)
  goto out_err;

 v2i_factor = haptics->impd * (haptics->imax + 4) / 1610400;
 error = regmap_write(haptics->regmap, DA7280_CALIB_V2I_L,
        v2i_factor & 0xff);
 if (error)
  goto out_err;
 error = regmap_write(haptics->regmap, DA7280_CALIB_V2I_H,
        v2i_factor >> 8);
 if (error)
  goto out_err;

 error = regmap_update_bits(haptics->regmap,
       DA7280_TOP_CTL1,
       DA7280_STANDBY_EN_MASK,
       DA7280_STANDBY_EN_MASK);
 if (error)
  goto out_err;

 if (haptics->mem_update) {
  error = da7280_haptic_mem_update(haptics);
  if (error)
   goto out_err;
 }

 /* Set  PS_SEQ_ID and PS_SEQ_LOOP */
 val = FIELD_PREP(DA7280_PS_SEQ_ID_MASK, haptics->ps_seq_id) |
  FIELD_PREP(DA7280_PS_SEQ_LOOP_MASK, haptics->ps_seq_loop);
 error = regmap_write(haptics->regmap, DA7280_SEQ_CTL2, val);
 if (error)
  goto out_err;

 /* GPI(N) CTL */
 for (i = 0; i < 3; i++) {
  val = FIELD_PREP(DA7280_GPI0_SEQUENCE_ID_MASK,
     haptics->gpi_ctl[i].seq_id) |
   FIELD_PREP(DA7280_GPI0_MODE_MASK,
       haptics->gpi_ctl[i].mode) |
   FIELD_PREP(DA7280_GPI0_POLARITY_MASK,
       haptics->gpi_ctl[i].polarity);
  error = regmap_write(haptics->regmap,
         DA7280_GPI_0_CTL + i, val);
  if (error)
   goto out_err;
 }

 /* Mask ADC_SAT_M bit as default */
 error = regmap_update_bits(haptics->regmap,
       DA7280_IRQ_MASK2,
       DA7280_ADC_SAT_M_MASK,
       DA7280_ADC_SAT_M_MASK);
 if (error)
  goto out_err;

 /* Clear Interrupts */
 error = regmap_write(haptics->regmap, DA7280_IRQ_EVENT1, 0xff);
 if (error)
  goto out_err;

 error = regmap_update_bits(haptics->regmap,
       DA7280_IRQ_MASK1,
       DA7280_SEQ_FAULT_M_MASK |
     DA7280_SEQ_DONE_M_MASK,
       0);
 if (error)
  goto out_err;

 haptics->active = false;
 return 0;

out_err:
 dev_err(haptics->dev, "chip initialization error: %d\n", error);
 return error;
}

static int da7280_probe(struct i2c_client *client)
{
 struct device *dev = &client->dev;
 struct da7280_haptic *haptics;
 struct input_dev *input_dev;
 struct pwm_state state;
 struct ff_device *ff;
 int error;

 if (!client->irq) {
  dev_err(dev, "No IRQ configured\n");
  return -EINVAL;
 }

 haptics = devm_kzalloc(dev, sizeof(*haptics), GFP_KERNEL);
 if (!haptics)
  return -ENOMEM;

 haptics->dev = dev;

 da7280_parse_properties(dev, haptics);

 if (haptics->const_op_mode == DA7280_PWM_MODE) {
  haptics->pwm_dev = devm_pwm_get(dev, NULL);
  error = PTR_ERR_OR_ZERO(haptics->pwm_dev);
  if (error) {
   if (error != -EPROBE_DEFER)
    dev_err(dev, "Unable to request PWM: %d\n",
     error);
   return error;
  }

  /* Sync up PWM state and ensure it is off. */
  pwm_init_state(haptics->pwm_dev, &state);
  state.enabled = false;
  error = pwm_apply_might_sleep(haptics->pwm_dev, &state);
  if (error) {
   dev_err(dev, "Failed to apply PWM state: %d\n", error);
   return error;
  }

  /*
 * Check PWM period, PWM freq = 1000000 / state.period.
 * The valid PWM freq range: 10k ~ 250kHz.
 */
  if (state.period > 100000 || state.period < 4000) {
   dev_err(dev, "Unsupported PWM period: %lld\n",
    state.period);
   return -EINVAL;
  }
 }

 INIT_WORK(&haptics->work, da7280_haptic_work);

 haptics->client = client;
 i2c_set_clientdata(client, haptics);

 haptics->regmap = devm_regmap_init_i2c(client,
            &da7280_haptic_regmap_config);
 error = PTR_ERR_OR_ZERO(haptics->regmap);
 if (error) {
  dev_err(dev, "Failed to allocate register map: %d\n", error);
  return error;
 }

 error = da7280_init(haptics);
 if (error) {
  dev_err(dev, "Failed to initialize device: %d\n", error);
  return error;
 }

 /* Initialize input device for haptic device */
 input_dev = devm_input_allocate_device(dev);
 if (!input_dev) {
  dev_err(dev, "Failed to allocate input device\n");
  return -ENOMEM;
 }

 input_dev->name = "da7280-haptic";
 input_dev->dev.parent = client->dev.parent;
 input_dev->open = da7280_haptic_open;
 input_dev->close = da7280_haptic_close;
 input_set_drvdata(input_dev, haptics);
 haptics->input_dev = input_dev;

 input_set_capability(haptics->input_dev, EV_FF, FF_PERIODIC);
 input_set_capability(haptics->input_dev, EV_FF, FF_CUSTOM);
 input_set_capability(haptics->input_dev, EV_FF, FF_CONSTANT);
 input_set_capability(haptics->input_dev, EV_FF, FF_GAIN);

 error = input_ff_create(haptics->input_dev,
    DA7280_FF_EFFECT_COUNT_MAX);
 if (error) {
  dev_err(dev, "Failed to create FF input device: %d\n", error);
  return error;
 }

 ff = input_dev->ff;
 ff->upload = da7280_haptics_upload_effect;
 ff->playback = da7280_haptics_playback;

 error = input_register_device(input_dev);
 if (error) {
  dev_err(dev, "Failed to register input device: %d\n", error);
  return error;
 }

 error = devm_request_threaded_irq(dev, client->irq,
       NULL, da7280_irq_handler,
       IRQF_ONESHOT,
       "da7280-haptics", haptics);
 if (error) {
  dev_err(dev, "Failed to request IRQ %d: %d\n",
   client->irq, error);
  return error;
 }

 return 0;
}

static int da7280_suspend(struct device *dev)
{
 struct da7280_haptic *haptics = dev_get_drvdata(dev);

 guard(mutex)(&haptics->input_dev->mutex);

 /*
 * Make sure no new requests will be submitted while device is
 * suspended.
 */
 scoped_guard(spinlock_irq, &haptics->input_dev->event_lock) {
  haptics->suspended = true;
 }

 da7280_haptic_stop(haptics);

 return 0;
}

static int da7280_resume(struct device *dev)
{
 struct da7280_haptic *haptics = dev_get_drvdata(dev);
 int error;

 guard(mutex)(&haptics->input_dev->mutex);

 error = da7280_haptic_start(haptics);
 if (error)
  return error;

 scoped_guard(spinlock_irq, &haptics->input_dev->event_lock) {
  haptics->suspended = false;
 }

 return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id da7280_of_match[] = {
 { .compatible = "dlg,da7280", },
 { }
};
MODULE_DEVICE_TABLE(of, da7280_of_match);
#endif

static const struct i2c_device_id da7280_i2c_id[] = {
 { "da7280", },
 { }
};
MODULE_DEVICE_TABLE(i2c, da7280_i2c_id);

static DEFINE_SIMPLE_DEV_PM_OPS(da7280_pm_ops, da7280_suspend, da7280_resume);

static struct i2c_driver da7280_driver = {
 .driver = {
  .name = "da7280",
  .of_match_table = of_match_ptr(da7280_of_match),
  .pm = pm_sleep_ptr(&da7280_pm_ops),
 },
 .probe = da7280_probe,
 .id_table = da7280_i2c_id,
};
module_i2c_driver(da7280_driver);

MODULE_DESCRIPTION("DA7280 haptics driver");
MODULE_AUTHOR("Roy Im ");
MODULE_LICENSE("GPL");