drivers/iio/light/gp2ap020a00f.c

   1 /*
   2  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
   3  * Author: Jacek Anaszewski <j.anaszewski@samsung.com>
   4  *
   5  * IIO features supported by the driver:
   6  *
   7  * Read-only raw channels:
   8  *   - illuminance_clear [lux]
   9  *   - illuminance_ir
  10  *   - proximity
  11  *
  12  * Triggered buffer:
  13  *   - illuminance_clear
  14  *   - illuminance_ir
  15  *   - proximity
  16  *
  17  * Events:
  18  *   - illuminance_clear (rising and falling)
  19  *   - proximity (rising and falling)
  20  *     - both falling and rising thresholds for the proximity events
  21  *       must be set to the values greater than 0.
  22  *
  23  * The driver supports triggered buffers for all the three
  24  * channels as well as high and low threshold events for the
  25  * illuminance_clear and proxmimity channels. Triggers
  26  * can be enabled simultaneously with both illuminance_clear
  27  * events. Proximity events cannot be enabled simultaneously
  28  * with any triggers or illuminance events. Enabling/disabling
  29  * one of the proximity events automatically enables/disables
  30  * the other one.
  31  *
  32  * This program is free software; you can redistribute it and/or modify
  33  * it under the terms of the GNU General Public License version 2, as
  34  * published by the Free Software Foundation.
  35  */
  36
  37 #include <linux/debugfs.h>
  38 #include <linux/delay.h>
  39 #include <linux/i2c.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/irq.h>
  42 #include <linux/irq_work.h>
  43 #include <linux/module.h>
  44 #include <linux/mutex.h>
  45 #include <linux/of.h>
  46 #include <linux/regmap.h>
  47 #include <linux/regulator/consumer.h>
  48 #include <linux/slab.h>
  49 #include <linux/iio/buffer.h>
  50 #include <linux/iio/events.h>
  51 #include <linux/iio/iio.h>
  52 #include <linux/iio/sysfs.h>
  53 #include <linux/iio/trigger.h>
  54 #include <linux/iio/trigger_consumer.h>
  55 #include <linux/iio/triggered_buffer.h>
  56
  57 #define GP2A_I2C_NAME "gp2ap020a00f"
  58
  59 /* Registers */
  60 #define GP2AP020A00F_OP_REG     0x00 /* Basic operations */
  61 #define GP2AP020A00F_ALS_REG    0x01 /* ALS related settings */
  62 #define GP2AP020A00F_PS_REG     0x02 /* PS related settings */
  63 #define GP2AP020A00F_LED_REG    0x03 /* LED reg */
  64 #define GP2AP020A00F_TL_L_REG   0x04 /* ALS: Threshold low LSB */
  65 #define GP2AP020A00F_TL_H_REG   0x05 /* ALS: Threshold low MSB */
  66 #define GP2AP020A00F_TH_L_REG   0x06 /* ALS: Threshold high LSB */
  67 #define GP2AP020A00F_TH_H_REG   0x07 /* ALS: Threshold high MSB */
  68 #define GP2AP020A00F_PL_L_REG   0x08 /* PS: Threshold low LSB */
  69 #define GP2AP020A00F_PL_H_REG   0x09 /* PS: Threshold low MSB */
  70 #define GP2AP020A00F_PH_L_REG   0x0a /* PS: Threshold high LSB */
  71 #define GP2AP020A00F_PH_H_REG   0x0b /* PS: Threshold high MSB */
  72 #define GP2AP020A00F_D0_L_REG   0x0c /* ALS result: Clear/Illuminance LSB */
  73 #define GP2AP020A00F_D0_H_REG   0x0d /* ALS result: Clear/Illuminance MSB */
  74 #define GP2AP020A00F_D1_L_REG   0x0e /* ALS result: IR LSB */
  75 #define GP2AP020A00F_D1_H_REG   0x0f /* ALS result: IR LSB */
  76 #define GP2AP020A00F_D2_L_REG   0x10 /* PS result LSB */
  77 #define GP2AP020A00F_D2_H_REG   0x11 /* PS result MSB */
  78 #define GP2AP020A00F_NUM_REGS   0x12 /* Number of registers */
  79
  80 /* OP_REG bits */
  81 #define GP2AP020A00F_OP3_MASK           0x80 /* Software shutdown */
  82 #define GP2AP020A00F_OP3_SHUTDOWN       0x00
  83 #define GP2AP020A00F_OP3_OPERATION      0x80
  84 #define GP2AP020A00F_OP2_MASK           0x40 /* Auto shutdown/Continuous mode */
  85 #define GP2AP020A00F_OP2_AUTO_SHUTDOWN  0x00
  86 #define GP2AP020A00F_OP2_CONT_OPERATION 0x40
  87 #define GP2AP020A00F_OP_MASK            0x30 /* Operating mode selection  */
  88 #define GP2AP020A00F_OP_ALS_AND_PS      0x00
  89 #define GP2AP020A00F_OP_ALS             0x10
  90 #define GP2AP020A00F_OP_PS              0x20
  91 #define GP2AP020A00F_OP_DEBUG           0x30
  92 #define GP2AP020A00F_PROX_MASK          0x08 /* PS: detection/non-detection */
  93 #define GP2AP020A00F_PROX_NON_DETECT    0x00
  94 #define GP2AP020A00F_PROX_DETECT        0x08
  95 #define GP2AP020A00F_FLAG_P             0x04 /* PS: interrupt result  */
  96 #define GP2AP020A00F_FLAG_A             0x02 /* ALS: interrupt result  */
  97 #define GP2AP020A00F_TYPE_MASK          0x01 /* Output data type selection */
  98 #define GP2AP020A00F_TYPE_MANUAL_CALC   0x00
  99 #define GP2AP020A00F_TYPE_AUTO_CALC     0x01
 100
 101 /* ALS_REG bits */
 102 #define GP2AP020A00F_PRST_MASK          0xc0 /* Number of measurement cycles */
 103 #define GP2AP020A00F_PRST_ONCE          0x00
 104 #define GP2AP020A00F_PRST_4_CYCLES      0x40
 105 #define GP2AP020A00F_PRST_8_CYCLES      0x80
 106 #define GP2AP020A00F_PRST_16_CYCLES     0xc0
 107 #define GP2AP020A00F_RES_A_MASK         0x38 /* ALS: Resolution */
 108 #define GP2AP020A00F_RES_A_800ms        0x00
 109 #define GP2AP020A00F_RES_A_400ms        0x08
 110 #define GP2AP020A00F_RES_A_200ms        0x10
 111 #define GP2AP020A00F_RES_A_100ms        0x18
 112 #define GP2AP020A00F_RES_A_25ms         0x20
 113 #define GP2AP020A00F_RES_A_6_25ms       0x28
 114 #define GP2AP020A00F_RES_A_1_56ms       0x30
 115 #define GP2AP020A00F_RES_A_0_39ms       0x38
 116 #define GP2AP020A00F_RANGE_A_MASK       0x07 /* ALS: Max measurable range */
 117 #define GP2AP020A00F_RANGE_A_x1         0x00
 118 #define GP2AP020A00F_RANGE_A_x2         0x01
 119 #define GP2AP020A00F_RANGE_A_x4         0x02
 120 #define GP2AP020A00F_RANGE_A_x8         0x03
 121 #define GP2AP020A00F_RANGE_A_x16        0x04
 122 #define GP2AP020A00F_RANGE_A_x32        0x05
 123 #define GP2AP020A00F_RANGE_A_x64        0x06
 124 #define GP2AP020A00F_RANGE_A_x128       0x07
 125
 126 /* PS_REG bits */
 127 #define GP2AP020A00F_ALC_MASK           0x80 /* Auto light cancel */
 128 #define GP2AP020A00F_ALC_ON             0x80
 129 #define GP2AP020A00F_ALC_OFF            0x00
 130 #define GP2AP020A00F_INTTYPE_MASK       0x40 /* Interrupt type setting */
 131 #define GP2AP020A00F_INTTYPE_LEVEL      0x00
 132 #define GP2AP020A00F_INTTYPE_PULSE      0x40
 133 #define GP2AP020A00F_RES_P_MASK         0x38 /* PS: Resolution */
 134 #define GP2AP020A00F_RES_P_800ms_x2     0x00
 135 #define GP2AP020A00F_RES_P_400ms_x2     0x08
 136 #define GP2AP020A00F_RES_P_200ms_x2     0x10
 137 #define GP2AP020A00F_RES_P_100ms_x2     0x18
 138 #define GP2AP020A00F_RES_P_25ms_x2      0x20
 139 #define GP2AP020A00F_RES_P_6_25ms_x2    0x28
 140 #define GP2AP020A00F_RES_P_1_56ms_x2    0x30
 141 #define GP2AP020A00F_RES_P_0_39ms_x2    0x38
 142 #define GP2AP020A00F_RANGE_P_MASK       0x07 /* PS: Max measurable range */
 143 #define GP2AP020A00F_RANGE_P_x1         0x00
 144 #define GP2AP020A00F_RANGE_P_x2         0x01
 145 #define GP2AP020A00F_RANGE_P_x4         0x02
 146 #define GP2AP020A00F_RANGE_P_x8         0x03
 147 #define GP2AP020A00F_RANGE_P_x16        0x04
 148 #define GP2AP020A00F_RANGE_P_x32        0x05
 149 #define GP2AP020A00F_RANGE_P_x64        0x06
 150 #define GP2AP020A00F_RANGE_P_x128       0x07
 151
 152 /* LED reg bits */
 153 #define GP2AP020A00F_INTVAL_MASK        0xc0 /* Intermittent operating */
 154 #define GP2AP020A00F_INTVAL_0           0x00
 155 #define GP2AP020A00F_INTVAL_4           0x40
 156 #define GP2AP020A00F_INTVAL_8           0x80
 157 #define GP2AP020A00F_INTVAL_16          0xc0
 158 #define GP2AP020A00F_IS_MASK            0x30 /* ILED drive peak current */
 159 #define GP2AP020A00F_IS_13_8mA          0x00
 160 #define GP2AP020A00F_IS_27_5mA          0x10
 161 #define GP2AP020A00F_IS_55mA            0x20
 162 #define GP2AP020A00F_IS_110mA           0x30
 163 #define GP2AP020A00F_PIN_MASK           0x0c /* INT terminal setting */
 164 #define GP2AP020A00F_PIN_ALS_OR_PS      0x00
 165 #define GP2AP020A00F_PIN_ALS            0x04
 166 #define GP2AP020A00F_PIN_PS             0x08
 167 #define GP2AP020A00F_PIN_PS_DETECT      0x0c
 168 #define GP2AP020A00F_FREQ_MASK          0x02 /* LED modulation frequency */
 169 #define GP2AP020A00F_FREQ_327_5kHz      0x00
 170 #define GP2AP020A00F_FREQ_81_8kHz       0x02
 171 #define GP2AP020A00F_RST                0x01 /* Software reset */
 172
 173 #define GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR      0
 174 #define GP2AP020A00F_SCAN_MODE_LIGHT_IR         1
 175 #define GP2AP020A00F_SCAN_MODE_PROXIMITY        2
 176 #define GP2AP020A00F_CHAN_TIMESTAMP             3
 177
 178 #define GP2AP020A00F_DATA_READY_TIMEOUT         msecs_to_jiffies(1000)
 179 #define GP2AP020A00F_DATA_REG(chan)             (GP2AP020A00F_D0_L_REG + \
 180                                                         (chan) * 2)
 181 #define GP2AP020A00F_THRESH_REG(th_val_id)      (GP2AP020A00F_TL_L_REG + \
 182                                                         (th_val_id) * 2)
 183 #define GP2AP020A00F_THRESH_VAL_ID(reg_addr)    ((reg_addr - 4) / 2)
 184
 185 #define GP2AP020A00F_SUBTRACT_MODE      0
 186 #define GP2AP020A00F_ADD_MODE           1
 187
 188 #define GP2AP020A00F_MAX_CHANNELS       3
 189
 190 enum gp2ap020a00f_opmode {
 191         GP2AP020A00F_OPMODE_READ_RAW_CLEAR,
 192         GP2AP020A00F_OPMODE_READ_RAW_IR,
 193         GP2AP020A00F_OPMODE_READ_RAW_PROXIMITY,
 194         GP2AP020A00F_OPMODE_ALS,
 195         GP2AP020A00F_OPMODE_PS,
 196         GP2AP020A00F_OPMODE_ALS_AND_PS,
 197         GP2AP020A00F_OPMODE_PROX_DETECT,
 198         GP2AP020A00F_OPMODE_SHUTDOWN,
 199         GP2AP020A00F_NUM_OPMODES,
 200 };
 201
 202 enum gp2ap020a00f_cmd {
 203         GP2AP020A00F_CMD_READ_RAW_CLEAR,
 204         GP2AP020A00F_CMD_READ_RAW_IR,
 205         GP2AP020A00F_CMD_READ_RAW_PROXIMITY,
 206         GP2AP020A00F_CMD_TRIGGER_CLEAR_EN,
 207         GP2AP020A00F_CMD_TRIGGER_CLEAR_DIS,
 208         GP2AP020A00F_CMD_TRIGGER_IR_EN,
 209         GP2AP020A00F_CMD_TRIGGER_IR_DIS,
 210         GP2AP020A00F_CMD_TRIGGER_PROX_EN,
 211         GP2AP020A00F_CMD_TRIGGER_PROX_DIS,
 212         GP2AP020A00F_CMD_ALS_HIGH_EV_EN,
 213         GP2AP020A00F_CMD_ALS_HIGH_EV_DIS,
 214         GP2AP020A00F_CMD_ALS_LOW_EV_EN,
 215         GP2AP020A00F_CMD_ALS_LOW_EV_DIS,
 216         GP2AP020A00F_CMD_PROX_HIGH_EV_EN,
 217         GP2AP020A00F_CMD_PROX_HIGH_EV_DIS,
 218         GP2AP020A00F_CMD_PROX_LOW_EV_EN,
 219         GP2AP020A00F_CMD_PROX_LOW_EV_DIS,
 220 };
 221
 222 enum gp2ap020a00f_flags {
 223         GP2AP020A00F_FLAG_ALS_CLEAR_TRIGGER,
 224         GP2AP020A00F_FLAG_ALS_IR_TRIGGER,
 225         GP2AP020A00F_FLAG_PROX_TRIGGER,
 226         GP2AP020A00F_FLAG_PROX_RISING_EV,
 227         GP2AP020A00F_FLAG_PROX_FALLING_EV,
 228         GP2AP020A00F_FLAG_ALS_RISING_EV,
 229         GP2AP020A00F_FLAG_ALS_FALLING_EV,
 230         GP2AP020A00F_FLAG_LUX_MODE_HI,
 231         GP2AP020A00F_FLAG_DATA_READY,
 232 };
 233
 234 enum gp2ap020a00f_thresh_val_id {
 235         GP2AP020A00F_THRESH_TL,
 236         GP2AP020A00F_THRESH_TH,
 237         GP2AP020A00F_THRESH_PL,
 238         GP2AP020A00F_THRESH_PH,
 239 };
 240
 241 struct gp2ap020a00f_data {
 242         const struct gp2ap020a00f_platform_data *pdata;
 243         struct i2c_client *client;
 244         struct mutex lock;
 245         char *buffer;
 246         struct regulator *vled_reg;
 247         unsigned long flags;
 248         enum gp2ap020a00f_opmode cur_opmode;
 249         struct iio_trigger *trig;
 250         struct regmap *regmap;
 251         unsigned int thresh_val[4];
 252         u8 debug_reg_addr;
 253         struct irq_work work;
 254         wait_queue_head_t data_ready_queue;
 255 };
 256
 257 static const u8 gp2ap020a00f_reg_init_tab[] = {
 258         [GP2AP020A00F_OP_REG] = GP2AP020A00F_OP3_SHUTDOWN,
 259         [GP2AP020A00F_ALS_REG] = GP2AP020A00F_RES_A_25ms |
 260                                  GP2AP020A00F_RANGE_A_x8,
 261         [GP2AP020A00F_PS_REG] = GP2AP020A00F_ALC_ON |
 262                                 GP2AP020A00F_RES_P_1_56ms_x2 |
 263                                 GP2AP020A00F_RANGE_P_x4,
 264         [GP2AP020A00F_LED_REG] = GP2AP020A00F_INTVAL_0 |
 265                                  GP2AP020A00F_IS_110mA |
 266                                  GP2AP020A00F_FREQ_327_5kHz,
 267         [GP2AP020A00F_TL_L_REG] = 0,
 268         [GP2AP020A00F_TL_H_REG] = 0,
 269         [GP2AP020A00F_TH_L_REG] = 0,
 270         [GP2AP020A00F_TH_H_REG] = 0,
 271         [GP2AP020A00F_PL_L_REG] = 0,
 272         [GP2AP020A00F_PL_H_REG] = 0,
 273         [GP2AP020A00F_PH_L_REG] = 0,
 274         [GP2AP020A00F_PH_H_REG] = 0,
 275 };
 276
 277 static bool gp2ap020a00f_is_volatile_reg(struct device *dev, unsigned int reg)
 278 {
 279         switch (reg) {
 280         case GP2AP020A00F_OP_REG:
 281         case GP2AP020A00F_D0_L_REG:
 282         case GP2AP020A00F_D0_H_REG:
 283         case GP2AP020A00F_D1_L_REG:
 284         case GP2AP020A00F_D1_H_REG:
 285         case GP2AP020A00F_D2_L_REG:
 286         case GP2AP020A00F_D2_H_REG:
 287                 return true;
 288         default:
 289                 return false;
 290         }
 291 }
 292
 293 static const struct regmap_config gp2ap020a00f_regmap_config = {
 294         .reg_bits = 8,
 295         .val_bits = 8,
 296
 297         .max_register = GP2AP020A00F_D2_H_REG,
 298         .cache_type = REGCACHE_RBTREE,
 299
 300         .volatile_reg = gp2ap020a00f_is_volatile_reg,
 301 };
 302
 303 static const struct gp2ap020a00f_mutable_config_regs {
 304         u8 op_reg;
 305         u8 als_reg;
 306         u8 ps_reg;
 307         u8 led_reg;
 308 } opmode_regs_settings[GP2AP020A00F_NUM_OPMODES] = {
 309         [GP2AP020A00F_OPMODE_READ_RAW_CLEAR] = {
 310                 GP2AP020A00F_OP_ALS | GP2AP020A00F_OP2_CONT_OPERATION
 311                 | GP2AP020A00F_OP3_OPERATION
 312                 | GP2AP020A00F_TYPE_AUTO_CALC,
 313                 GP2AP020A00F_PRST_ONCE,
 314                 GP2AP020A00F_INTTYPE_LEVEL,
 315                 GP2AP020A00F_PIN_ALS
 316         },
 317         [GP2AP020A00F_OPMODE_READ_RAW_IR] = {
 318                 GP2AP020A00F_OP_ALS | GP2AP020A00F_OP2_CONT_OPERATION
 319                 | GP2AP020A00F_OP3_OPERATION
 320                 | GP2AP020A00F_TYPE_MANUAL_CALC,
 321                 GP2AP020A00F_PRST_ONCE,
 322                 GP2AP020A00F_INTTYPE_LEVEL,
 323                 GP2AP020A00F_PIN_ALS
 324         },
 325         [GP2AP020A00F_OPMODE_READ_RAW_PROXIMITY] = {
 326                 GP2AP020A00F_OP_PS | GP2AP020A00F_OP2_CONT_OPERATION
 327                 | GP2AP020A00F_OP3_OPERATION
 328                 | GP2AP020A00F_TYPE_MANUAL_CALC,
 329                 GP2AP020A00F_PRST_ONCE,
 330                 GP2AP020A00F_INTTYPE_LEVEL,
 331                 GP2AP020A00F_PIN_PS
 332         },
 333         [GP2AP020A00F_OPMODE_PROX_DETECT] = {
 334                 GP2AP020A00F_OP_PS | GP2AP020A00F_OP2_CONT_OPERATION
 335                 | GP2AP020A00F_OP3_OPERATION
 336                 | GP2AP020A00F_TYPE_MANUAL_CALC,
 337                 GP2AP020A00F_PRST_4_CYCLES,
 338                 GP2AP020A00F_INTTYPE_PULSE,
 339                 GP2AP020A00F_PIN_PS_DETECT
 340         },
 341         [GP2AP020A00F_OPMODE_ALS] = {
 342                 GP2AP020A00F_OP_ALS | GP2AP020A00F_OP2_CONT_OPERATION
 343                 | GP2AP020A00F_OP3_OPERATION
 344                 | GP2AP020A00F_TYPE_AUTO_CALC,
 345                 GP2AP020A00F_PRST_ONCE,
 346                 GP2AP020A00F_INTTYPE_LEVEL,
 347                 GP2AP020A00F_PIN_ALS
 348         },
 349         [GP2AP020A00F_OPMODE_PS] = {
 350                 GP2AP020A00F_OP_PS | GP2AP020A00F_OP2_CONT_OPERATION
 351                 | GP2AP020A00F_OP3_OPERATION
 352                 | GP2AP020A00F_TYPE_MANUAL_CALC,
 353                 GP2AP020A00F_PRST_4_CYCLES,
 354                 GP2AP020A00F_INTTYPE_LEVEL,
 355                 GP2AP020A00F_PIN_PS
 356         },
 357         [GP2AP020A00F_OPMODE_ALS_AND_PS] = {
 358                 GP2AP020A00F_OP_ALS_AND_PS
 359                 | GP2AP020A00F_OP2_CONT_OPERATION
 360                 | GP2AP020A00F_OP3_OPERATION
 361                 | GP2AP020A00F_TYPE_AUTO_CALC,
 362                 GP2AP020A00F_PRST_4_CYCLES,
 363                 GP2AP020A00F_INTTYPE_LEVEL,
 364                 GP2AP020A00F_PIN_ALS_OR_PS
 365         },
 366         [GP2AP020A00F_OPMODE_SHUTDOWN] = { GP2AP020A00F_OP3_SHUTDOWN, },
 367 };
 368
 369 static int gp2ap020a00f_set_operation_mode(struct gp2ap020a00f_data *data,
 370                                         enum gp2ap020a00f_opmode op)
 371 {
 372         unsigned int op_reg_val;
 373         int err;
 374
 375         if (op != GP2AP020A00F_OPMODE_SHUTDOWN) {
 376                 err = regmap_read(data->regmap, GP2AP020A00F_OP_REG,
 377                                         &op_reg_val);
 378                 if (err < 0)
 379                         return err;
 380                 /*
 381                  * Shutdown the device if the operation being executed entails
 382                  * mode transition.
 383                  */
 384                 if ((opmode_regs_settings[op].op_reg & GP2AP020A00F_OP_MASK) !=
 385                     (op_reg_val & GP2AP020A00F_OP_MASK)) {
 386                         /* set shutdown mode */
 387                         err = regmap_update_bits(data->regmap,
 388                                 GP2AP020A00F_OP_REG, GP2AP020A00F_OP3_MASK,
 389                                 GP2AP020A00F_OP3_SHUTDOWN);
 390                         if (err < 0)
 391                                 return err;
 392                 }
 393
 394                 err = regmap_update_bits(data->regmap, GP2AP020A00F_ALS_REG,
 395                         GP2AP020A00F_PRST_MASK, opmode_regs_settings[op]
 396                                                                 .als_reg);
 397                 if (err < 0)
 398                         return err;
 399
 400                 err = regmap_update_bits(data->regmap, GP2AP020A00F_PS_REG,
 401                         GP2AP020A00F_INTTYPE_MASK, opmode_regs_settings[op]
 402                                                                 .ps_reg);
 403                 if (err < 0)
 404                         return err;
 405
 406                 err = regmap_update_bits(data->regmap, GP2AP020A00F_LED_REG,
 407                         GP2AP020A00F_PIN_MASK, opmode_regs_settings[op]
 408                                                                 .led_reg);
 409                 if (err < 0)
 410                         return err;
 411         }
 412
 413         /* Set OP_REG and apply operation mode (power on / off) */
 414         err = regmap_update_bits(data->regmap,
 415                                  GP2AP020A00F_OP_REG,
 416                                  GP2AP020A00F_OP_MASK | GP2AP020A00F_OP2_MASK |
 417                                  GP2AP020A00F_OP3_MASK | GP2AP020A00F_TYPE_MASK,
 418                                  opmode_regs_settings[op].op_reg);
 419         if (err < 0)
 420                 return err;
 421
 422         data->cur_opmode = op;
 423
 424         return 0;
 425 }
 426
 427 static bool gp2ap020a00f_als_enabled(struct gp2ap020a00f_data *data)
 428 {
 429         return test_bit(GP2AP020A00F_FLAG_ALS_CLEAR_TRIGGER, &data->flags) ||
 430                test_bit(GP2AP020A00F_FLAG_ALS_IR_TRIGGER, &data->flags) ||
 431                test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags) ||
 432                test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags);
 433 }
 434
 435 static bool gp2ap020a00f_prox_detect_enabled(struct gp2ap020a00f_data *data)
 436 {
 437         return test_bit(GP2AP020A00F_FLAG_PROX_RISING_EV, &data->flags) ||
 438                test_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV, &data->flags);
 439 }
 440
 441 static int gp2ap020a00f_write_event_threshold(struct gp2ap020a00f_data *data,
 442                                 enum gp2ap020a00f_thresh_val_id th_val_id,
 443                                 bool enable)
 444 {
 445         __le16 thresh_buf = 0;
 446         unsigned int thresh_reg_val;
 447
 448         if (!enable)
 449                 thresh_reg_val = 0;
 450         else if (test_bit(GP2AP020A00F_FLAG_LUX_MODE_HI, &data->flags) &&
 451                  th_val_id != GP2AP020A00F_THRESH_PL &&
 452                  th_val_id != GP2AP020A00F_THRESH_PH)
 453                 /*
 454                  * For the high lux mode ALS threshold has to be scaled down
 455                  * to allow for proper comparison with the output value.
 456                  */
 457                 thresh_reg_val = data->thresh_val[th_val_id] / 16;
 458         else
 459                 thresh_reg_val = data->thresh_val[th_val_id] > 16000 ?
 460                                         16000 :
 461                                         data->thresh_val[th_val_id];
 462
 463         thresh_buf = cpu_to_le16(thresh_reg_val);
 464
 465         return regmap_bulk_write(data->regmap,
 466                                  GP2AP020A00F_THRESH_REG(th_val_id),
 467                                  (u8 *)&thresh_buf, 2);
 468 }
 469
 470 static int gp2ap020a00f_alter_opmode(struct gp2ap020a00f_data *data,
 471                         enum gp2ap020a00f_opmode diff_mode, int add_sub)
 472 {
 473         enum gp2ap020a00f_opmode new_mode;
 474
 475         if (diff_mode != GP2AP020A00F_OPMODE_ALS &&
 476             diff_mode != GP2AP020A00F_OPMODE_PS)
 477                 return -EINVAL;
 478
 479         if (add_sub == GP2AP020A00F_ADD_MODE) {
 480                 if (data->cur_opmode == GP2AP020A00F_OPMODE_SHUTDOWN)
 481                         new_mode =  diff_mode;
 482                 else
 483                         new_mode = GP2AP020A00F_OPMODE_ALS_AND_PS;
 484         } else {
 485                 if (data->cur_opmode == GP2AP020A00F_OPMODE_ALS_AND_PS)
 486                         new_mode = (diff_mode == GP2AP020A00F_OPMODE_ALS) ?
 487                                         GP2AP020A00F_OPMODE_PS :
 488                                         GP2AP020A00F_OPMODE_ALS;
 489                 else
 490                         new_mode = GP2AP020A00F_OPMODE_SHUTDOWN;
 491         }
 492
 493         return gp2ap020a00f_set_operation_mode(data, new_mode);
 494 }
 495
 496 static int gp2ap020a00f_exec_cmd(struct gp2ap020a00f_data *data,
 497                                         enum gp2ap020a00f_cmd cmd)
 498 {
 499         int err = 0;
 500
 501         switch (cmd) {
 502         case GP2AP020A00F_CMD_READ_RAW_CLEAR:
 503                 if (data->cur_opmode != GP2AP020A00F_OPMODE_SHUTDOWN)
 504                         return -EBUSY;
 505                 err = gp2ap020a00f_set_operation_mode(data,
 506                                         GP2AP020A00F_OPMODE_READ_RAW_CLEAR);
 507                 break;
 508         case GP2AP020A00F_CMD_READ_RAW_IR:
 509                 if (data->cur_opmode != GP2AP020A00F_OPMODE_SHUTDOWN)
 510                         return -EBUSY;
 511                 err = gp2ap020a00f_set_operation_mode(data,
 512                                         GP2AP020A00F_OPMODE_READ_RAW_IR);
 513                 break;
 514         case GP2AP020A00F_CMD_READ_RAW_PROXIMITY:
 515                 if (data->cur_opmode != GP2AP020A00F_OPMODE_SHUTDOWN)
 516                         return -EBUSY;
 517                 err = gp2ap020a00f_set_operation_mode(data,
 518                                         GP2AP020A00F_OPMODE_READ_RAW_PROXIMITY);
 519                 break;
 520         case GP2AP020A00F_CMD_TRIGGER_CLEAR_EN:
 521                 if (data->cur_opmode == GP2AP020A00F_OPMODE_PROX_DETECT)
 522                         return -EBUSY;
 523                 if (!gp2ap020a00f_als_enabled(data))
 524                         err = gp2ap020a00f_alter_opmode(data,
 525                                                 GP2AP020A00F_OPMODE_ALS,
 526                                                 GP2AP020A00F_ADD_MODE);
 527                 set_bit(GP2AP020A00F_FLAG_ALS_CLEAR_TRIGGER, &data->flags);
 528                 break;
 529         case GP2AP020A00F_CMD_TRIGGER_CLEAR_DIS:
 530                 clear_bit(GP2AP020A00F_FLAG_ALS_CLEAR_TRIGGER, &data->flags);
 531                 if (gp2ap020a00f_als_enabled(data))
 532                         break;
 533                 err = gp2ap020a00f_alter_opmode(data,
 534                                                 GP2AP020A00F_OPMODE_ALS,
 535                                                 GP2AP020A00F_SUBTRACT_MODE);
 536                 break;
 537         case GP2AP020A00F_CMD_TRIGGER_IR_EN:
 538                 if (data->cur_opmode == GP2AP020A00F_OPMODE_PROX_DETECT)
 539                         return -EBUSY;
 540                 if (!gp2ap020a00f_als_enabled(data))
 541                         err = gp2ap020a00f_alter_opmode(data,
 542                                                 GP2AP020A00F_OPMODE_ALS,
 543                                                 GP2AP020A00F_ADD_MODE);
 544                 set_bit(GP2AP020A00F_FLAG_ALS_IR_TRIGGER, &data->flags);
 545                 break;
 546         case GP2AP020A00F_CMD_TRIGGER_IR_DIS:
 547                 clear_bit(GP2AP020A00F_FLAG_ALS_IR_TRIGGER, &data->flags);
 548                 if (gp2ap020a00f_als_enabled(data))
 549                         break;
 550                 err = gp2ap020a00f_alter_opmode(data,
 551                                                 GP2AP020A00F_OPMODE_ALS,
 552                                                 GP2AP020A00F_SUBTRACT_MODE);
 553                 break;
 554         case GP2AP020A00F_CMD_TRIGGER_PROX_EN:
 555                 if (data->cur_opmode == GP2AP020A00F_OPMODE_PROX_DETECT)
 556                         return -EBUSY;
 557                 err = gp2ap020a00f_alter_opmode(data,
 558                                                 GP2AP020A00F_OPMODE_PS,
 559                                                 GP2AP020A00F_ADD_MODE);
 560                 set_bit(GP2AP020A00F_FLAG_PROX_TRIGGER, &data->flags);
 561                 break;
 562         case GP2AP020A00F_CMD_TRIGGER_PROX_DIS:
 563                 clear_bit(GP2AP020A00F_FLAG_PROX_TRIGGER, &data->flags);
 564                 err = gp2ap020a00f_alter_opmode(data,
 565                                                 GP2AP020A00F_OPMODE_PS,
 566                                                 GP2AP020A00F_SUBTRACT_MODE);
 567                 break;
 568         case GP2AP020A00F_CMD_ALS_HIGH_EV_EN:
 569                 if (test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags))
 570                         return 0;
 571                 if (data->cur_opmode == GP2AP020A00F_OPMODE_PROX_DETECT)
 572                         return -EBUSY;
 573                 if (!gp2ap020a00f_als_enabled(data)) {
 574                         err = gp2ap020a00f_alter_opmode(data,
 575                                                 GP2AP020A00F_OPMODE_ALS,
 576                                                 GP2AP020A00F_ADD_MODE);
 577                         if (err < 0)
 578                                 return err;
 579                 }
 580                 set_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags);
 581                 err =  gp2ap020a00f_write_event_threshold(data,
 582                                         GP2AP020A00F_THRESH_TH, true);
 583                 break;
 584         case GP2AP020A00F_CMD_ALS_HIGH_EV_DIS:
 585                 if (!test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags))
 586                         return 0;
 587                 clear_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags);
 588                 if (!gp2ap020a00f_als_enabled(data)) {
 589                         err = gp2ap020a00f_alter_opmode(data,
 590                                                 GP2AP020A00F_OPMODE_ALS,
 591                                                 GP2AP020A00F_SUBTRACT_MODE);
 592                         if (err < 0)
 593                                 return err;
 594                 }
 595                 err =  gp2ap020a00f_write_event_threshold(data,
 596                                         GP2AP020A00F_THRESH_TH, false);
 597                 break;
 598         case GP2AP020A00F_CMD_ALS_LOW_EV_EN:
 599                 if (test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags))
 600                         return 0;
 601                 if (data->cur_opmode == GP2AP020A00F_OPMODE_PROX_DETECT)
 602                         return -EBUSY;
 603                 if (!gp2ap020a00f_als_enabled(data)) {
 604                         err = gp2ap020a00f_alter_opmode(data,
 605                                                 GP2AP020A00F_OPMODE_ALS,
 606                                                 GP2AP020A00F_ADD_MODE);
 607                         if (err < 0)
 608                                 return err;
 609                 }
 610                 set_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags);
 611                 err =  gp2ap020a00f_write_event_threshold(data,
 612                                         GP2AP020A00F_THRESH_TL, true);
 613                 break;
 614         case GP2AP020A00F_CMD_ALS_LOW_EV_DIS:
 615                 if (!test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags))
 616                         return 0;
 617                 clear_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags);
 618                 if (!gp2ap020a00f_als_enabled(data)) {
 619                         err = gp2ap020a00f_alter_opmode(data,
 620                                                 GP2AP020A00F_OPMODE_ALS,
 621                                                 GP2AP020A00F_SUBTRACT_MODE);
 622                         if (err < 0)
 623                                 return err;
 624                 }
 625                 err =  gp2ap020a00f_write_event_threshold(data,
 626                                         GP2AP020A00F_THRESH_TL, false);
 627                 break;
 628         case GP2AP020A00F_CMD_PROX_HIGH_EV_EN:
 629                 if (test_bit(GP2AP020A00F_FLAG_PROX_RISING_EV, &data->flags))
 630                         return 0;
 631                 if (gp2ap020a00f_als_enabled(data) ||
 632                     data->cur_opmode == GP2AP020A00F_OPMODE_PS)
 633                         return -EBUSY;
 634                 if (!gp2ap020a00f_prox_detect_enabled(data)) {
 635                         err = gp2ap020a00f_set_operation_mode(data,
 636                                         GP2AP020A00F_OPMODE_PROX_DETECT);
 637                         if (err < 0)
 638                                 return err;
 639                 }
 640                 set_bit(GP2AP020A00F_FLAG_PROX_RISING_EV, &data->flags);
 641                 err =  gp2ap020a00f_write_event_threshold(data,
 642                                         GP2AP020A00F_THRESH_PH, true);
 643                 break;
 644         case GP2AP020A00F_CMD_PROX_HIGH_EV_DIS:
 645                 if (!test_bit(GP2AP020A00F_FLAG_PROX_RISING_EV, &data->flags))
 646                         return 0;
 647                 clear_bit(GP2AP020A00F_FLAG_PROX_RISING_EV, &data->flags);
 648                 err = gp2ap020a00f_set_operation_mode(data,
 649                                         GP2AP020A00F_OPMODE_SHUTDOWN);
 650                 if (err < 0)
 651                         return err;
 652                 err =  gp2ap020a00f_write_event_threshold(data,
 653                                         GP2AP020A00F_THRESH_PH, false);
 654                 break;
 655         case GP2AP020A00F_CMD_PROX_LOW_EV_EN:
 656                 if (test_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV, &data->flags))
 657                         return 0;
 658                 if (gp2ap020a00f_als_enabled(data) ||
 659                     data->cur_opmode == GP2AP020A00F_OPMODE_PS)
 660                         return -EBUSY;
 661                 if (!gp2ap020a00f_prox_detect_enabled(data)) {
 662                         err = gp2ap020a00f_set_operation_mode(data,
 663                                         GP2AP020A00F_OPMODE_PROX_DETECT);
 664                         if (err < 0)
 665                                 return err;
 666                 }
 667                 set_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV, &data->flags);
 668                 err =  gp2ap020a00f_write_event_threshold(data,
 669                                         GP2AP020A00F_THRESH_PL, true);
 670                 break;
 671         case GP2AP020A00F_CMD_PROX_LOW_EV_DIS:
 672                 if (!test_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV, &data->flags))
 673                         return 0;
 674                 clear_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV, &data->flags);
 675                 err = gp2ap020a00f_set_operation_mode(data,
 676                                         GP2AP020A00F_OPMODE_SHUTDOWN);
 677                 if (err < 0)
 678                         return err;
 679                 err =  gp2ap020a00f_write_event_threshold(data,
 680                                         GP2AP020A00F_THRESH_PL, false);
 681                 break;
 682         }
 683
 684         return err;
 685 }
 686
 687 static int wait_conversion_complete_irq(struct gp2ap020a00f_data *data)
 688 {
 689         int ret;
 690
 691         ret = wait_event_timeout(data->data_ready_queue,
 692                                  test_bit(GP2AP020A00F_FLAG_DATA_READY,
 693                                           &data->flags),
 694                                  GP2AP020A00F_DATA_READY_TIMEOUT);
 695         clear_bit(GP2AP020A00F_FLAG_DATA_READY, &data->flags);
 696
 697         return ret > 0 ? 0 : -ETIME;
 698 }
 699
 700 static int gp2ap020a00f_read_output(struct gp2ap020a00f_data *data,
 701                                         unsigned int output_reg, int *val)
 702 {
 703         u8 reg_buf[2];
 704         int err;
 705
 706         err = wait_conversion_complete_irq(data);
 707         if (err < 0)
 708                 dev_dbg(&data->client->dev, "data ready timeout\n");
 709
 710         err = regmap_bulk_read(data->regmap, output_reg, reg_buf, 2);
 711         if (err < 0)
 712                 return err;
 713
 714         *val = le16_to_cpup((__le16 *)reg_buf);
 715
 716         return err;
 717 }
 718
 719 static bool gp2ap020a00f_adjust_lux_mode(struct gp2ap020a00f_data *data,
 720                                  int output_val)
 721 {
 722         u8 new_range = 0xff;
 723         int err;
 724
 725         if (!test_bit(GP2AP020A00F_FLAG_LUX_MODE_HI, &data->flags)) {
 726                 if (output_val > 16000) {
 727                         set_bit(GP2AP020A00F_FLAG_LUX_MODE_HI, &data->flags);
 728                         new_range = GP2AP020A00F_RANGE_A_x128;
 729                 }
 730         } else {
 731                 if (output_val < 1000) {
 732                         clear_bit(GP2AP020A00F_FLAG_LUX_MODE_HI, &data->flags);
 733                         new_range = GP2AP020A00F_RANGE_A_x8;
 734                 }
 735         }
 736
 737         if (new_range != 0xff) {
 738                 /* Clear als threshold registers to avoid spurious
 739                  * events caused by lux mode transition.
 740                  */
 741                 err =  gp2ap020a00f_write_event_threshold(data,
 742                                         GP2AP020A00F_THRESH_TH, false);
 743                 if (err < 0) {
 744                         dev_err(&data->client->dev,
 745                                 "Clearing als threshold register failed.\n");
 746                         return false;
 747                 }
 748
 749                 err =  gp2ap020a00f_write_event_threshold(data,
 750                                         GP2AP020A00F_THRESH_TL, false);
 751                 if (err < 0) {
 752                         dev_err(&data->client->dev,
 753                                 "Clearing als threshold register failed.\n");
 754                         return false;
 755                 }
 756
 757                 /* Change lux mode */
 758                 err = regmap_update_bits(data->regmap,
 759                         GP2AP020A00F_OP_REG,
 760                         GP2AP020A00F_OP3_MASK,
 761                         GP2AP020A00F_OP3_SHUTDOWN);
 762
 763                 if (err < 0) {
 764                         dev_err(&data->client->dev,
 765                                 "Shutting down the device failed.\n");
 766                         return false;
 767                 }
 768
 769                 err = regmap_update_bits(data->regmap,
 770                         GP2AP020A00F_ALS_REG,
 771                         GP2AP020A00F_RANGE_A_MASK,
 772                         new_range);
 773
 774                 if (err < 0) {
 775                         dev_err(&data->client->dev,
 776                                 "Adjusting device lux mode failed.\n");
 777                         return false;
 778                 }
 779
 780                 err = regmap_update_bits(data->regmap,
 781                         GP2AP020A00F_OP_REG,
 782                         GP2AP020A00F_OP3_MASK,
 783                         GP2AP020A00F_OP3_OPERATION);
 784
 785                 if (err < 0) {
 786                         dev_err(&data->client->dev,
 787                                 "Powering up the device failed.\n");
 788                         return false;
 789                 }
 790
 791                 /* Adjust als threshold register values to the new lux mode */
 792                 if (test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags)) {
 793                         err =  gp2ap020a00f_write_event_threshold(data,
 794                                         GP2AP020A00F_THRESH_TH, true);
 795                         if (err < 0) {
 796                                 dev_err(&data->client->dev,
 797                                 "Adjusting als threshold value failed.\n");
 798                                 return false;
 799                         }
 800                 }
 801
 802                 if (test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags)) {
 803                         err =  gp2ap020a00f_write_event_threshold(data,
 804                                         GP2AP020A00F_THRESH_TL, true);
 805                         if (err < 0) {
 806                                 dev_err(&data->client->dev,
 807                                 "Adjusting als threshold value failed.\n");
 808                                 return false;
 809                         }
 810                 }
 811
 812                 return true;
 813         }
 814
 815         return false;
 816 }
 817
 818 static void gp2ap020a00f_output_to_lux(struct gp2ap020a00f_data *data,
 819                                                 int *output_val)
 820 {
 821         if (test_bit(GP2AP020A00F_FLAG_LUX_MODE_HI, &data->flags))
 822                 *output_val *= 16;
 823 }
 824
 825 static void gp2ap020a00f_iio_trigger_work(struct irq_work *work)
 826 {
 827         struct gp2ap020a00f_data *data =
 828                 container_of(work, struct gp2ap020a00f_data, work);
 829
 830         iio_trigger_poll(data->trig);
 831 }
 832
 833 static irqreturn_t gp2ap020a00f_prox_sensing_handler(int irq, void *data)
 834 {
 835         struct iio_dev *indio_dev = data;
 836         struct gp2ap020a00f_data *priv = iio_priv(indio_dev);
 837         unsigned int op_reg_val;
 838         int ret;
 839
 840         /* Read interrupt flags */
 841         ret = regmap_read(priv->regmap, GP2AP020A00F_OP_REG, &op_reg_val);
 842         if (ret < 0)
 843                 return IRQ_HANDLED;
 844
 845         if (gp2ap020a00f_prox_detect_enabled(priv)) {
 846                 if (op_reg_val & GP2AP020A00F_PROX_DETECT) {
 847                         iio_push_event(indio_dev,
 848                                IIO_UNMOD_EVENT_CODE(
 849                                     IIO_PROXIMITY,
 850                                     GP2AP020A00F_SCAN_MODE_PROXIMITY,
 851                                     IIO_EV_TYPE_ROC,
 852                                     IIO_EV_DIR_RISING),
 853                                iio_get_time_ns());
 854                 } else {
 855                         iio_push_event(indio_dev,
 856                                IIO_UNMOD_EVENT_CODE(
 857                                     IIO_PROXIMITY,
 858                                     GP2AP020A00F_SCAN_MODE_PROXIMITY,
 859                                     IIO_EV_TYPE_ROC,
 860                                     IIO_EV_DIR_FALLING),
 861                                iio_get_time_ns());
 862                 }
 863         }
 864
 865         return IRQ_HANDLED;
 866 }
 867
 868 static irqreturn_t gp2ap020a00f_thresh_event_handler(int irq, void *data)
 869 {
 870         struct iio_dev *indio_dev = data;
 871         struct gp2ap020a00f_data *priv = iio_priv(indio_dev);
 872         u8 op_reg_flags, d0_reg_buf[2];
 873         unsigned int output_val, op_reg_val;
 874         int thresh_val_id, ret;
 875
 876         /* Read interrupt flags */
 877         ret = regmap_read(priv->regmap, GP2AP020A00F_OP_REG,
 878                                                         &op_reg_val);
 879         if (ret < 0)
 880                 goto done;
 881
 882         op_reg_flags = op_reg_val & (GP2AP020A00F_FLAG_A | GP2AP020A00F_FLAG_P
 883                                         | GP2AP020A00F_PROX_DETECT);
 884
 885         op_reg_val &= (~GP2AP020A00F_FLAG_A & ~GP2AP020A00F_FLAG_P
 886                                         & ~GP2AP020A00F_PROX_DETECT);
 887
 888         /* Clear interrupt flags (if not in INTTYPE_PULSE mode) */
 889         if (priv->cur_opmode != GP2AP020A00F_OPMODE_PROX_DETECT) {
 890                 ret = regmap_write(priv->regmap, GP2AP020A00F_OP_REG,
 891                                                                 op_reg_val);
 892                 if (ret < 0)
 893                         goto done;
 894         }
 895
 896         if (op_reg_flags & GP2AP020A00F_FLAG_A) {
 897                 /* Check D0 register to assess if the lux mode
 898                  * transition is required.
 899                  */
 900                 ret = regmap_bulk_read(priv->regmap, GP2AP020A00F_D0_L_REG,
 901                                                         d0_reg_buf, 2);
 902                 if (ret < 0)
 903                         goto done;
 904
 905                 output_val = le16_to_cpup((__le16 *)d0_reg_buf);
 906
 907                 if (gp2ap020a00f_adjust_lux_mode(priv, output_val))
 908                         goto done;
 909
 910                 gp2ap020a00f_output_to_lux(priv, &output_val);
 911
 912                 /*
 913                  * We need to check output value to distinguish
 914                  * between high and low ambient light threshold event.
 915                  */
 916                 if (test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &priv->flags)) {
 917                         thresh_val_id =
 918                             GP2AP020A00F_THRESH_VAL_ID(GP2AP020A00F_TH_L_REG);
 919                         if (output_val > priv->thresh_val[thresh_val_id])
 920                                 iio_push_event(indio_dev,
 921                                        IIO_MOD_EVENT_CODE(
 922                                             IIO_LIGHT,
 923                                             GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR,
 924                                             IIO_MOD_LIGHT_CLEAR,
 925                                             IIO_EV_TYPE_THRESH,
 926                                             IIO_EV_DIR_RISING),
 927                                        iio_get_time_ns());
 928                 }
 929
 930                 if (test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &priv->flags)) {
 931                         thresh_val_id =
 932                             GP2AP020A00F_THRESH_VAL_ID(GP2AP020A00F_TL_L_REG);
 933                         if (output_val < priv->thresh_val[thresh_val_id])
 934                                 iio_push_event(indio_dev,
 935                                        IIO_MOD_EVENT_CODE(
 936                                             IIO_LIGHT,
 937                                             GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR,
 938                                             IIO_MOD_LIGHT_CLEAR,
 939                                             IIO_EV_TYPE_THRESH,
 940                                             IIO_EV_DIR_FALLING),
 941                                        iio_get_time_ns());
 942                 }
 943         }
 944
 945         if (priv->cur_opmode == GP2AP020A00F_OPMODE_READ_RAW_CLEAR ||
 946             priv->cur_opmode == GP2AP020A00F_OPMODE_READ_RAW_IR ||
 947             priv->cur_opmode == GP2AP020A00F_OPMODE_READ_RAW_PROXIMITY) {
 948                 set_bit(GP2AP020A00F_FLAG_DATA_READY, &priv->flags);
 949                 wake_up(&priv->data_ready_queue);
 950                 goto done;
 951         }
 952
 953         if (test_bit(GP2AP020A00F_FLAG_ALS_CLEAR_TRIGGER, &priv->flags) ||
 954             test_bit(GP2AP020A00F_FLAG_ALS_IR_TRIGGER, &priv->flags) ||
 955             test_bit(GP2AP020A00F_FLAG_PROX_TRIGGER, &priv->flags))
 956                 /* This fires off the trigger. */
 957                 irq_work_queue(&priv->work);
 958
 959 done:
 960         return IRQ_HANDLED;
 961 }
 962
 963 static irqreturn_t gp2ap020a00f_trigger_handler(int irq, void *data)
 964 {
 965         struct iio_poll_func *pf = data;
 966         struct iio_dev *indio_dev = pf->indio_dev;
 967         struct gp2ap020a00f_data *priv = iio_priv(indio_dev);
 968         size_t d_size = 0;
 969         __le32 light_lux;
 970         int i, out_val, ret;
 971
 972         for_each_set_bit(i, indio_dev->active_scan_mask,
 973                 indio_dev->masklength) {
 974                 ret = regmap_bulk_read(priv->regmap,
 975                                 GP2AP020A00F_DATA_REG(i),
 976                                 &priv->buffer[d_size], 2);
 977                 if (ret < 0)
 978                         goto done;
 979
 980                 if (i == GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR ||
 981                     i == GP2AP020A00F_SCAN_MODE_LIGHT_IR) {
 982                         out_val = le16_to_cpup((__le16 *)&priv->buffer[d_size]);
 983                         gp2ap020a00f_output_to_lux(priv, &out_val);
 984                         light_lux = cpu_to_le32(out_val);
 985                         memcpy(&priv->buffer[d_size], (u8 *)&light_lux, 4);
 986                         d_size += 4;
 987                 } else {
 988                         d_size += 2;
 989                 }
 990         }
 991
 992         iio_push_to_buffers_with_timestamp(indio_dev, priv->buffer,
 993                 pf->timestamp);
 994 done:
 995         iio_trigger_notify_done(indio_dev->trig);
 996
 997         return IRQ_HANDLED;
 998 }
 999
1000 static u8 gp2ap020a00f_get_thresh_reg(const struct iio_chan_spec *chan,
1001                                              enum iio_event_direction event_dir)
1002 {
1003         switch (chan->type) {
1004         case IIO_PROXIMITY:
1005                 if (event_dir == IIO_EV_DIR_RISING)
1006                         return GP2AP020A00F_PH_L_REG;
1007                 else
1008                         return GP2AP020A00F_PL_L_REG;
1009         case IIO_LIGHT:
1010                 if (event_dir == IIO_EV_DIR_RISING)
1011                         return GP2AP020A00F_TH_L_REG;
1012                 else
1013                         return GP2AP020A00F_TL_L_REG;
1014         default:
1015                 break;
1016         }
1017
1018         return -EINVAL;
1019 }
1020
1021 static int gp2ap020a00f_write_event_val(struct iio_dev *indio_dev,
1022                                         const struct iio_chan_spec *chan,
1023                                         enum iio_event_type type,
1024                                         enum iio_event_direction dir,
1025                                         enum iio_event_info info,
1026                                         int val, int val2)
1027 {
1028         struct gp2ap020a00f_data *data = iio_priv(indio_dev);
1029         bool event_en = false;
1030         u8 thresh_val_id;
1031         u8 thresh_reg_l;
1032         int err = 0;
1033
1034         mutex_lock(&data->lock);
1035
1036         thresh_reg_l = gp2ap020a00f_get_thresh_reg(chan, dir);
1037         thresh_val_id = GP2AP020A00F_THRESH_VAL_ID(thresh_reg_l);
1038
1039         if (thresh_val_id > GP2AP020A00F_THRESH_PH) {
1040                 err = -EINVAL;
1041                 goto error_unlock;
1042         }
1043
1044         switch (thresh_reg_l) {
1045         case GP2AP020A00F_TH_L_REG:
1046                 event_en = test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV,
1047                                                         &data->flags);
1048                 break;
1049         case GP2AP020A00F_TL_L_REG:
1050                 event_en = test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV,
1051                                                         &data->flags);
1052                 break;
1053         case GP2AP020A00F_PH_L_REG:
1054                 if (val == 0) {
1055                         err = -EINVAL;
1056                         goto error_unlock;
1057                 }
1058                 event_en = test_bit(GP2AP020A00F_FLAG_PROX_RISING_EV,
1059                                                         &data->flags);
1060                 break;
1061         case GP2AP020A00F_PL_L_REG:
1062                 if (val == 0) {
1063                         err = -EINVAL;
1064                         goto error_unlock;
1065                 }
1066                 event_en = test_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV,
1067                                                         &data->flags);
1068                 break;
1069         }
1070
1071         data->thresh_val[thresh_val_id] = val;
1072         err =  gp2ap020a00f_write_event_threshold(data, thresh_val_id,
1073                                                         event_en);
1074 error_unlock:
1075         mutex_unlock(&data->lock);
1076
1077         return err;
1078 }
1079
1080 static int gp2ap020a00f_read_event_val(struct iio_dev *indio_dev,
1081                                        const struct iio_chan_spec *chan,
1082                                        enum iio_event_type type,
1083                                        enum iio_event_direction dir,
1084                                        enum iio_event_info info,
1085                                        int *val, int *val2)
1086 {
1087         struct gp2ap020a00f_data *data = iio_priv(indio_dev);
1088         u8 thresh_reg_l;
1089         int err = IIO_VAL_INT;
1090
1091         mutex_lock(&data->lock);
1092
1093         thresh_reg_l = gp2ap020a00f_get_thresh_reg(chan, dir);
1094
1095         if (thresh_reg_l > GP2AP020A00F_PH_L_REG) {
1096                 err = -EINVAL;
1097                 goto error_unlock;
1098         }
1099
1100         *val = data->thresh_val[GP2AP020A00F_THRESH_VAL_ID(thresh_reg_l)];
1101
1102 error_unlock:
1103         mutex_unlock(&data->lock);
1104
1105         return err;
1106 }
1107
1108 static int gp2ap020a00f_write_prox_event_config(struct iio_dev *indio_dev,
1109                                                 int state)
1110 {
1111         struct gp2ap020a00f_data *data = iio_priv(indio_dev);
1112         enum gp2ap020a00f_cmd cmd_high_ev, cmd_low_ev;
1113         int err;
1114
1115         cmd_high_ev = state ? GP2AP020A00F_CMD_PROX_HIGH_EV_EN :
1116                               GP2AP020A00F_CMD_PROX_HIGH_EV_DIS;
1117         cmd_low_ev = state ? GP2AP020A00F_CMD_PROX_LOW_EV_EN :
1118                              GP2AP020A00F_CMD_PROX_LOW_EV_DIS;
1119
1120         /*
1121          * In order to enable proximity detection feature in the device
1122          * both high and low threshold registers have to be written
1123          * with different values, greater than zero.
1124          */
1125         if (state) {
1126                 if (data->thresh_val[GP2AP020A00F_THRESH_PL] == 0)
1127                         return -EINVAL;
1128
1129                 if (data->thresh_val[GP2AP020A00F_THRESH_PH] == 0)
1130                         return -EINVAL;
1131         }
1132
1133         err = gp2ap020a00f_exec_cmd(data, cmd_high_ev);
1134         if (err < 0)
1135                 return err;
1136
1137         err = gp2ap020a00f_exec_cmd(data, cmd_low_ev);
1138         if (err < 0)
1139                 return err;
1140
1141         free_irq(data->client->irq, indio_dev);
1142
1143         if (state)
1144                 err = request_threaded_irq(data->client->irq, NULL,
1145                                            &gp2ap020a00f_prox_sensing_handler,
1146                                            IRQF_TRIGGER_RISING |
1147                                            IRQF_TRIGGER_FALLING |
1148                                            IRQF_ONESHOT,
1149                                            "gp2ap020a00f_prox_sensing",
1150                                            indio_dev);
1151         else {
1152                 err = request_threaded_irq(data->client->irq, NULL,
1153                                            &gp2ap020a00f_thresh_event_handler,
1154                                            IRQF_TRIGGER_FALLING |
1155                                            IRQF_ONESHOT,
1156                                            "gp2ap020a00f_thresh_event",
1157                                            indio_dev);
1158         }
1159
1160         return err;
1161 }
1162
1163 static int gp2ap020a00f_write_event_config(struct iio_dev *indio_dev,
1164                                            const struct iio_chan_spec *chan,
1165                                            enum iio_event_type type,
1166                                            enum iio_event_direction dir,
1167                                            int state)
1168 {
1169         struct gp2ap020a00f_data *data = iio_priv(indio_dev);
1170         enum gp2ap020a00f_cmd cmd;
1171         int err;
1172
1173         mutex_lock(&data->lock);
1174
1175         switch (chan->type) {
1176         case IIO_PROXIMITY:
1177                 err = gp2ap020a00f_write_prox_event_config(indio_dev, state);
1178                 break;
1179         case IIO_LIGHT:
1180                 if (dir == IIO_EV_DIR_RISING) {
1181                         cmd = state ? GP2AP020A00F_CMD_ALS_HIGH_EV_EN :
1182                                       GP2AP020A00F_CMD_ALS_HIGH_EV_DIS;
1183                         err = gp2ap020a00f_exec_cmd(data, cmd);
1184                 } else {
1185                         cmd = state ? GP2AP020A00F_CMD_ALS_LOW_EV_EN :
1186                                       GP2AP020A00F_CMD_ALS_LOW_EV_DIS;
1187                         err = gp2ap020a00f_exec_cmd(data, cmd);
1188                 }
1189                 break;
1190         default:
1191                 err = -EINVAL;
1192         }
1193
1194         mutex_unlock(&data->lock);
1195
1196         return err;
1197 }
1198
1199 static int gp2ap020a00f_read_event_config(struct iio_dev *indio_dev,
1200                                            const struct iio_chan_spec *chan,
1201                                            enum iio_event_type type,
1202                                            enum iio_event_direction dir)
1203 {
1204         struct gp2ap020a00f_data *data = iio_priv(indio_dev);
1205         int event_en = 0;
1206
1207         mutex_lock(&data->lock);
1208
1209         switch (chan->type) {
1210         case IIO_PROXIMITY:
1211                 if (dir == IIO_EV_DIR_RISING)
1212                         event_en = test_bit(GP2AP020A00F_FLAG_PROX_RISING_EV,
1213                                                                 &data->flags);
1214                 else
1215                         event_en = test_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV,
1216                                                                 &data->flags);
1217                 break;
1218         case IIO_LIGHT:
1219                 if (dir == IIO_EV_DIR_RISING)
1220                         event_en = test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV,
1221                                                                 &data->flags);
1222                 else
1223                         event_en = test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV,
1224                                                                 &data->flags);
1225                 break;
1226         default:
1227                 event_en = -EINVAL;
1228                 break;
1229         }
1230
1231         mutex_unlock(&data->lock);
1232
1233         return event_en;
1234 }
1235
1236 static int gp2ap020a00f_read_channel(struct gp2ap020a00f_data *data,
1237                                 struct iio_chan_spec const *chan, int *val)
1238 {
1239         enum gp2ap020a00f_cmd cmd;
1240         int err;
1241
1242         switch (chan->scan_index) {
1243         case GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR:
1244                 cmd = GP2AP020A00F_CMD_READ_RAW_CLEAR;
1245                 break;
1246         case GP2AP020A00F_SCAN_MODE_LIGHT_IR:
1247                 cmd = GP2AP020A00F_CMD_READ_RAW_IR;
1248                 break;
1249         case GP2AP020A00F_SCAN_MODE_PROXIMITY:
1250                 cmd = GP2AP020A00F_CMD_READ_RAW_PROXIMITY;
1251                 break;
1252         default:
1253                 return -EINVAL;
1254         }
1255
1256         err = gp2ap020a00f_exec_cmd(data, cmd);
1257         if (err < 0) {
1258                 dev_err(&data->client->dev,
1259                         "gp2ap020a00f_exec_cmd failed\n");
1260                 goto error_ret;
1261         }
1262
1263         err = gp2ap020a00f_read_output(data, chan->address, val);
1264         if (err < 0)
1265                 dev_err(&data->client->dev,
1266                         "gp2ap020a00f_read_output failed\n");
1267
1268         err = gp2ap020a00f_set_operation_mode(data,
1269                                         GP2AP020A00F_OPMODE_SHUTDOWN);
1270         if (err < 0)
1271                 dev_err(&data->client->dev,
1272                         "Failed to shut down the device.\n");
1273
1274         if (cmd == GP2AP020A00F_CMD_READ_RAW_CLEAR ||
1275             cmd == GP2AP020A00F_CMD_READ_RAW_IR)
1276                 gp2ap020a00f_output_to_lux(data, val);
1277
1278 error_ret:
1279         return err;
1280 }
1281
1282 static int gp2ap020a00f_read_raw(struct iio_dev *indio_dev,
1283                            struct iio_chan_spec const *chan,
1284                            int *val, int *val2,
1285                            long mask)
1286 {
1287         struct gp2ap020a00f_data *data = iio_priv(indio_dev);
1288         int err = -EINVAL;
1289
1290         mutex_lock(&data->lock);
1291
1292         switch (mask) {
1293         case IIO_CHAN_INFO_RAW:
1294                 if (iio_buffer_enabled(indio_dev)) {
1295                         err = -EBUSY;
1296                         goto error_unlock;
1297                 }
1298
1299                 err = gp2ap020a00f_read_channel(data, chan, val);
1300                 break;
1301         }
1302
1303 error_unlock:
1304         mutex_unlock(&data->lock);
1305
1306         return err < 0 ? err : IIO_VAL_INT;
1307 }
1308
1309 static const struct iio_event_spec gp2ap020a00f_event_spec_light[] = {
1310         {
1311                 .type = IIO_EV_TYPE_THRESH,
1312                 .dir = IIO_EV_DIR_RISING,
1313                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
1314                         BIT(IIO_EV_INFO_ENABLE),
1315         }, {
1316                 .type = IIO_EV_TYPE_THRESH,
1317                 .dir = IIO_EV_DIR_FALLING,
1318                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
1319                         BIT(IIO_EV_INFO_ENABLE),
1320         },
1321 };
1322
1323 static const struct iio_event_spec gp2ap020a00f_event_spec_prox[] = {
1324         {
1325                 .type = IIO_EV_TYPE_ROC,
1326                 .dir = IIO_EV_DIR_RISING,
1327                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
1328                         BIT(IIO_EV_INFO_ENABLE),
1329         }, {
1330                 .type = IIO_EV_TYPE_ROC,
1331                 .dir = IIO_EV_DIR_FALLING,
1332                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
1333                         BIT(IIO_EV_INFO_ENABLE),
1334         },
1335 };
1336
1337 static const struct iio_chan_spec gp2ap020a00f_channels[] = {
1338         {
1339                 .type = IIO_LIGHT,
1340                 .channel2 = IIO_MOD_LIGHT_CLEAR,
1341                 .modified = 1,
1342                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1343                 .scan_type = {
1344                         .sign = 'u',
1345                         .realbits = 24,
1346                         .shift = 0,
1347                         .storagebits = 32,
1348                         .endianness = IIO_LE,
1349                 },
1350                 .scan_index = GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR,
1351                 .address = GP2AP020A00F_D0_L_REG,
1352                 .event_spec = gp2ap020a00f_event_spec_light,
1353                 .num_event_specs = ARRAY_SIZE(gp2ap020a00f_event_spec_light),
1354         },
1355         {
1356                 .type = IIO_LIGHT,
1357                 .channel2 = IIO_MOD_LIGHT_IR,
1358                 .modified = 1,
1359                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1360                 .scan_type = {
1361                         .sign = 'u',
1362                         .realbits = 24,
1363                         .shift = 0,
1364                         .storagebits = 32,
1365                         .endianness = IIO_LE,
1366                 },
1367                 .scan_index = GP2AP020A00F_SCAN_MODE_LIGHT_IR,
1368                 .address = GP2AP020A00F_D1_L_REG,
1369         },
1370         {
1371                 .type = IIO_PROXIMITY,
1372                 .modified = 0,
1373                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1374                 .scan_type = {
1375                         .sign = 'u',
1376                         .realbits = 16,
1377                         .shift = 0,
1378                         .storagebits = 16,
1379                         .endianness = IIO_LE,
1380                 },
1381                 .scan_index = GP2AP020A00F_SCAN_MODE_PROXIMITY,
1382                 .address = GP2AP020A00F_D2_L_REG,
1383                 .event_spec = gp2ap020a00f_event_spec_prox,
1384                 .num_event_specs = ARRAY_SIZE(gp2ap020a00f_event_spec_prox),
1385         },
1386         IIO_CHAN_SOFT_TIMESTAMP(GP2AP020A00F_CHAN_TIMESTAMP),
1387 };
1388
1389 static const struct iio_info gp2ap020a00f_info = {
1390         .read_raw = &gp2ap020a00f_read_raw,
1391         .read_event_value = &gp2ap020a00f_read_event_val,
1392         .read_event_config = &gp2ap020a00f_read_event_config,
1393         .write_event_value = &gp2ap020a00f_write_event_val,
1394         .write_event_config = &gp2ap020a00f_write_event_config,
1395         .driver_module = THIS_MODULE,
1396 };
1397
1398 static int gp2ap020a00f_buffer_postenable(struct iio_dev *indio_dev)
1399 {
1400         struct gp2ap020a00f_data *data = iio_priv(indio_dev);
1401         int i, err = 0;
1402
1403         mutex_lock(&data->lock);
1404
1405         /*
1406          * Enable triggers according to the scan_mask. Enabling either
1407          * LIGHT_CLEAR or LIGHT_IR scan mode results in enabling ALS
1408          * module in the device, which generates samples in both D0 (clear)
1409          * and D1 (ir) registers. As the two registers are bound to the
1410          * two separate IIO channels they are treated in the driver logic
1411          * as if they were controlled independently.
1412          */
1413         for_each_set_bit(i, indio_dev->active_scan_mask,
1414                 indio_dev->masklength) {
1415                 switch (i) {
1416                 case GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR:
1417                         err = gp2ap020a00f_exec_cmd(data,
1418                                         GP2AP020A00F_CMD_TRIGGER_CLEAR_EN);
1419                         break;
1420                 case GP2AP020A00F_SCAN_MODE_LIGHT_IR:
1421                         err = gp2ap020a00f_exec_cmd(data,
1422                                         GP2AP020A00F_CMD_TRIGGER_IR_EN);
1423                         break;
1424                 case GP2AP020A00F_SCAN_MODE_PROXIMITY:
1425                         err = gp2ap020a00f_exec_cmd(data,
1426                                         GP2AP020A00F_CMD_TRIGGER_PROX_EN);
1427                         break;
1428                 }
1429         }
1430
1431         if (err < 0)
1432                 goto error_unlock;
1433
1434         data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
1435         if (!data->buffer) {
1436                 err = -ENOMEM;
1437                 goto error_unlock;
1438         }
1439
1440         err = iio_triggered_buffer_postenable(indio_dev);
1441
1442 error_unlock:
1443         mutex_unlock(&data->lock);
1444
1445         return err;
1446 }
1447
1448 static int gp2ap020a00f_buffer_predisable(struct iio_dev *indio_dev)
1449 {
1450         struct gp2ap020a00f_data *data = iio_priv(indio_dev);
1451         int i, err;
1452
1453         mutex_lock(&data->lock);
1454
1455         err = iio_triggered_buffer_predisable(indio_dev);
1456         if (err < 0)
1457                 goto error_unlock;
1458
1459         for_each_set_bit(i, indio_dev->active_scan_mask,
1460                 indio_dev->masklength) {
1461                 switch (i) {
1462                 case GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR:
1463                         err = gp2ap020a00f_exec_cmd(data,
1464                                         GP2AP020A00F_CMD_TRIGGER_CLEAR_DIS);
1465                         break;
1466                 case GP2AP020A00F_SCAN_MODE_LIGHT_IR:
1467                         err = gp2ap020a00f_exec_cmd(data,
1468                                         GP2AP020A00F_CMD_TRIGGER_IR_DIS);
1469                         break;
1470                 case GP2AP020A00F_SCAN_MODE_PROXIMITY:
1471                         err = gp2ap020a00f_exec_cmd(data,
1472                                         GP2AP020A00F_CMD_TRIGGER_PROX_DIS);
1473                         break;
1474                 }
1475         }
1476
1477         if (err == 0)
1478                 kfree(data->buffer);
1479
1480 error_unlock:
1481         mutex_unlock(&data->lock);
1482
1483         return err;
1484 }
1485
1486 static const struct iio_buffer_setup_ops gp2ap020a00f_buffer_setup_ops = {
1487         .postenable = &gp2ap020a00f_buffer_postenable,
1488         .predisable = &gp2ap020a00f_buffer_predisable,
1489 };
1490
1491 static const struct iio_trigger_ops gp2ap020a00f_trigger_ops = {
1492         .owner = THIS_MODULE,
1493 };
1494
1495 static int gp2ap020a00f_probe(struct i2c_client *client,
1496                                 const struct i2c_device_id *id)
1497 {
1498         struct gp2ap020a00f_data *data;
1499         struct iio_dev *indio_dev;
1500         struct regmap *regmap;
1501         int err;
1502
1503         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1504         if (!indio_dev)
1505                 return -ENOMEM;
1506
1507         data = iio_priv(indio_dev);
1508
1509         data->vled_reg = devm_regulator_get(&client->dev, "vled");
1510         if (IS_ERR(data->vled_reg))
1511                 return PTR_ERR(data->vled_reg);
1512
1513         err = regulator_enable(data->vled_reg);
1514         if (err)
1515                 return err;
1516
1517         regmap = devm_regmap_init_i2c(client, &gp2ap020a00f_regmap_config);
1518         if (IS_ERR(regmap)) {
1519                 dev_err(&client->dev, "Regmap initialization failed.\n");
1520                 err = PTR_ERR(regmap);
1521                 goto error_regulator_disable;
1522         }
1523
1524         /* Initialize device registers */
1525         err = regmap_bulk_write(regmap, GP2AP020A00F_OP_REG,
1526                         gp2ap020a00f_reg_init_tab,
1527                         ARRAY_SIZE(gp2ap020a00f_reg_init_tab));
1528
1529         if (err < 0) {
1530                 dev_err(&client->dev, "Device initialization failed.\n");
1531                 goto error_regulator_disable;
1532         }
1533
1534         i2c_set_clientdata(client, indio_dev);
1535
1536         data->client = client;
1537         data->cur_opmode = GP2AP020A00F_OPMODE_SHUTDOWN;
1538         data->regmap = regmap;
1539         init_waitqueue_head(&data->data_ready_queue);
1540
1541         mutex_init(&data->lock);
1542         indio_dev->dev.parent = &client->dev;
1543         indio_dev->channels = gp2ap020a00f_channels;
1544         indio_dev->num_channels = ARRAY_SIZE(gp2ap020a00f_channels);
1545         indio_dev->info = &gp2ap020a00f_info;
1546         indio_dev->name = id->name;
1547         indio_dev->modes = INDIO_DIRECT_MODE;
1548
1549         /* Allocate buffer */
1550         err = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
1551                 &gp2ap020a00f_trigger_handler, &gp2ap020a00f_buffer_setup_ops);
1552         if (err < 0)
1553                 goto error_regulator_disable;
1554
1555         /* Allocate trigger */
1556         data->trig = devm_iio_trigger_alloc(&client->dev, "%s-trigger",
1557                                                         indio_dev->name);
1558         if (data->trig == NULL) {
1559                 err = -ENOMEM;
1560                 dev_err(&indio_dev->dev, "Failed to allocate iio trigger.\n");
1561                 goto error_uninit_buffer;
1562         }
1563
1564         /* This needs to be requested here for read_raw calls to work. */
1565         err = request_threaded_irq(client->irq, NULL,
1566                                    &gp2ap020a00f_thresh_event_handler,
1567                                    IRQF_TRIGGER_FALLING |
1568                                    IRQF_ONESHOT,
1569                                    "gp2ap020a00f_als_event",
1570                                    indio_dev);
1571         if (err < 0) {
1572                 dev_err(&client->dev, "Irq request failed.\n");
1573                 goto error_uninit_buffer;
1574         }
1575
1576         data->trig->ops = &gp2ap020a00f_trigger_ops;
1577         data->trig->dev.parent = &data->client->dev;
1578
1579         init_irq_work(&data->work, gp2ap020a00f_iio_trigger_work);
1580
1581         err = iio_trigger_register(data->trig);
1582         if (err < 0) {
1583                 dev_err(&client->dev, "Failed to register iio trigger.\n");
1584                 goto error_free_irq;
1585         }
1586
1587         err = iio_device_register(indio_dev);
1588         if (err < 0)
1589                 goto error_trigger_unregister;
1590
1591         return 0;
1592
1593 error_trigger_unregister:
1594         iio_trigger_unregister(data->trig);
1595 error_free_irq:
1596         free_irq(client->irq, indio_dev);
1597 error_uninit_buffer:
1598         iio_triggered_buffer_cleanup(indio_dev);
1599 error_regulator_disable:
1600         regulator_disable(data->vled_reg);
1601
1602         return err;
1603 }
1604
1605 static int gp2ap020a00f_remove(struct i2c_client *client)
1606 {
1607         struct iio_dev *indio_dev = i2c_get_clientdata(client);
1608         struct gp2ap020a00f_data *data = iio_priv(indio_dev);
1609         int err;
1610
1611         err = gp2ap020a00f_set_operation_mode(data,
1612                                         GP2AP020A00F_OPMODE_SHUTDOWN);
1613         if (err < 0)
1614                 dev_err(&indio_dev->dev, "Failed to power off the device.\n");
1615
1616         iio_device_unregister(indio_dev);
1617         iio_trigger_unregister(data->trig);
1618         free_irq(client->irq, indio_dev);
1619         iio_triggered_buffer_cleanup(indio_dev);
1620         regulator_disable(data->vled_reg);
1621
1622         return 0;
1623 }
1624
1625 static const struct i2c_device_id gp2ap020a00f_id[] = {
1626         { GP2A_I2C_NAME, 0 },
1627         { }
1628 };
1629
1630 MODULE_DEVICE_TABLE(i2c, gp2ap020a00f_id);
1631
1632 #ifdef CONFIG_OF
1633 static const struct of_device_id gp2ap020a00f_of_match[] = {
1634         { .compatible = "sharp,gp2ap020a00f" },
1635         { }
1636 };
1637 #endif
1638
1639 static struct i2c_driver gp2ap020a00f_driver = {
1640         .driver = {
1641                 .name   = GP2A_I2C_NAME,
1642                 .of_match_table = of_match_ptr(gp2ap020a00f_of_match),
1643                 .owner  = THIS_MODULE,
1644         },
1645         .probe          = gp2ap020a00f_probe,
1646         .remove         = gp2ap020a00f_remove,
1647         .id_table       = gp2ap020a00f_id,
1648 };
1649
1650 module_i2c_driver(gp2ap020a00f_driver);
1651
1652 MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
1653 MODULE_DESCRIPTION("Sharp GP2AP020A00F Proximity/ALS sensor driver");
1654 MODULE_LICENSE("GPL v2");