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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * RPR-0521 ROHM Ambient Light and Proximity Sensor
0004  *
0005  * Copyright (c) 2015, Intel Corporation.
0006  *
0007  * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38).
0008  *
0009  * TODO: illuminance channel
0010  */
0011 
0012 #include <linux/module.h>
0013 #include <linux/init.h>
0014 #include <linux/i2c.h>
0015 #include <linux/regmap.h>
0016 #include <linux/delay.h>
0017 #include <linux/acpi.h>
0018 
0019 #include <linux/iio/iio.h>
0020 #include <linux/iio/buffer.h>
0021 #include <linux/iio/trigger.h>
0022 #include <linux/iio/trigger_consumer.h>
0023 #include <linux/iio/triggered_buffer.h>
0024 #include <linux/iio/sysfs.h>
0025 #include <linux/pm_runtime.h>
0026 
0027 #define RPR0521_REG_SYSTEM_CTRL     0x40
0028 #define RPR0521_REG_MODE_CTRL       0x41
0029 #define RPR0521_REG_ALS_CTRL        0x42
0030 #define RPR0521_REG_PXS_CTRL        0x43
0031 #define RPR0521_REG_PXS_DATA        0x44 /* 16-bit, little endian */
0032 #define RPR0521_REG_ALS_DATA0       0x46 /* 16-bit, little endian */
0033 #define RPR0521_REG_ALS_DATA1       0x48 /* 16-bit, little endian */
0034 #define RPR0521_REG_INTERRUPT       0x4A
0035 #define RPR0521_REG_PS_OFFSET_LSB   0x53
0036 #define RPR0521_REG_ID          0x92
0037 
0038 #define RPR0521_MODE_ALS_MASK       BIT(7)
0039 #define RPR0521_MODE_PXS_MASK       BIT(6)
0040 #define RPR0521_MODE_MEAS_TIME_MASK GENMASK(3, 0)
0041 #define RPR0521_ALS_DATA0_GAIN_MASK GENMASK(5, 4)
0042 #define RPR0521_ALS_DATA0_GAIN_SHIFT    4
0043 #define RPR0521_ALS_DATA1_GAIN_MASK GENMASK(3, 2)
0044 #define RPR0521_ALS_DATA1_GAIN_SHIFT    2
0045 #define RPR0521_PXS_GAIN_MASK       GENMASK(5, 4)
0046 #define RPR0521_PXS_GAIN_SHIFT      4
0047 #define RPR0521_PXS_PERSISTENCE_MASK    GENMASK(3, 0)
0048 #define RPR0521_INTERRUPT_INT_TRIG_PS_MASK  BIT(0)
0049 #define RPR0521_INTERRUPT_INT_TRIG_ALS_MASK BIT(1)
0050 #define RPR0521_INTERRUPT_INT_REASSERT_MASK BIT(3)
0051 #define RPR0521_INTERRUPT_ALS_INT_STATUS_MASK   BIT(6)
0052 #define RPR0521_INTERRUPT_PS_INT_STATUS_MASK    BIT(7)
0053 
0054 #define RPR0521_MODE_ALS_ENABLE     BIT(7)
0055 #define RPR0521_MODE_ALS_DISABLE    0x00
0056 #define RPR0521_MODE_PXS_ENABLE     BIT(6)
0057 #define RPR0521_MODE_PXS_DISABLE    0x00
0058 #define RPR0521_PXS_PERSISTENCE_DRDY    0x00
0059 
0060 #define RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE    BIT(0)
0061 #define RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE   0x00
0062 #define RPR0521_INTERRUPT_INT_TRIG_ALS_ENABLE   BIT(1)
0063 #define RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE  0x00
0064 #define RPR0521_INTERRUPT_INT_REASSERT_ENABLE   BIT(3)
0065 #define RPR0521_INTERRUPT_INT_REASSERT_DISABLE  0x00
0066 
0067 #define RPR0521_MANUFACT_ID     0xE0
0068 #define RPR0521_DEFAULT_MEAS_TIME   0x06 /* ALS - 100ms, PXS - 100ms */
0069 
0070 #define RPR0521_DRV_NAME        "RPR0521"
0071 #define RPR0521_IRQ_NAME        "rpr0521_event"
0072 #define RPR0521_REGMAP_NAME     "rpr0521_regmap"
0073 
0074 #define RPR0521_SLEEP_DELAY_MS  2000
0075 
0076 #define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1"
0077 #define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1"
0078 
0079 struct rpr0521_gain {
0080     int scale;
0081     int uscale;
0082 };
0083 
0084 static const struct rpr0521_gain rpr0521_als_gain[4] = {
0085     {1, 0},     /* x1 */
0086     {0, 500000},    /* x2 */
0087     {0, 15625}, /* x64 */
0088     {0, 7812},  /* x128 */
0089 };
0090 
0091 static const struct rpr0521_gain rpr0521_pxs_gain[3] = {
0092     {1, 0},     /* x1 */
0093     {0, 500000},    /* x2 */
0094     {0, 125000},    /* x4 */
0095 };
0096 
0097 enum rpr0521_channel {
0098     RPR0521_CHAN_PXS,
0099     RPR0521_CHAN_ALS_DATA0,
0100     RPR0521_CHAN_ALS_DATA1,
0101 };
0102 
0103 struct rpr0521_reg_desc {
0104     u8 address;
0105     u8 device_mask;
0106 };
0107 
0108 static const struct rpr0521_reg_desc rpr0521_data_reg[] = {
0109     [RPR0521_CHAN_PXS]  = {
0110         .address    = RPR0521_REG_PXS_DATA,
0111         .device_mask    = RPR0521_MODE_PXS_MASK,
0112     },
0113     [RPR0521_CHAN_ALS_DATA0] = {
0114         .address    = RPR0521_REG_ALS_DATA0,
0115         .device_mask    = RPR0521_MODE_ALS_MASK,
0116     },
0117     [RPR0521_CHAN_ALS_DATA1] = {
0118         .address    = RPR0521_REG_ALS_DATA1,
0119         .device_mask    = RPR0521_MODE_ALS_MASK,
0120     },
0121 };
0122 
0123 static const struct rpr0521_gain_info {
0124     u8 reg;
0125     u8 mask;
0126     u8 shift;
0127     const struct rpr0521_gain *gain;
0128     int size;
0129 } rpr0521_gain[] = {
0130     [RPR0521_CHAN_PXS] = {
0131         .reg    = RPR0521_REG_PXS_CTRL,
0132         .mask   = RPR0521_PXS_GAIN_MASK,
0133         .shift  = RPR0521_PXS_GAIN_SHIFT,
0134         .gain   = rpr0521_pxs_gain,
0135         .size   = ARRAY_SIZE(rpr0521_pxs_gain),
0136     },
0137     [RPR0521_CHAN_ALS_DATA0] = {
0138         .reg    = RPR0521_REG_ALS_CTRL,
0139         .mask   = RPR0521_ALS_DATA0_GAIN_MASK,
0140         .shift  = RPR0521_ALS_DATA0_GAIN_SHIFT,
0141         .gain   = rpr0521_als_gain,
0142         .size   = ARRAY_SIZE(rpr0521_als_gain),
0143     },
0144     [RPR0521_CHAN_ALS_DATA1] = {
0145         .reg    = RPR0521_REG_ALS_CTRL,
0146         .mask   = RPR0521_ALS_DATA1_GAIN_MASK,
0147         .shift  = RPR0521_ALS_DATA1_GAIN_SHIFT,
0148         .gain   = rpr0521_als_gain,
0149         .size   = ARRAY_SIZE(rpr0521_als_gain),
0150     },
0151 };
0152 
0153 struct rpr0521_samp_freq {
0154     int als_hz;
0155     int als_uhz;
0156     int pxs_hz;
0157     int pxs_uhz;
0158 };
0159 
0160 static const struct rpr0521_samp_freq rpr0521_samp_freq_i[13] = {
0161 /*  {ALS, PXS},        W==currently writable option */
0162     {0, 0, 0, 0},       /* W0000, 0=standby */
0163     {0, 0, 100, 0},     /*  0001 */
0164     {0, 0, 25, 0},      /*  0010 */
0165     {0, 0, 10, 0},      /*  0011 */
0166     {0, 0, 2, 500000},  /*  0100 */
0167     {10, 0, 20, 0},     /*  0101 */
0168     {10, 0, 10, 0},     /* W0110 */
0169     {10, 0, 2, 500000}, /*  0111 */
0170     {2, 500000, 20, 0}, /*  1000, measurement 100ms, sleep 300ms */
0171     {2, 500000, 10, 0}, /*  1001, measurement 100ms, sleep 300ms */
0172     {2, 500000, 0, 0},  /*  1010, high sensitivity mode */
0173     {2, 500000, 2, 500000}, /* W1011, high sensitivity mode */
0174     {20, 0, 20, 0}  /* 1100, ALS_data x 0.5, see specification P.18 */
0175 };
0176 
0177 struct rpr0521_data {
0178     struct i2c_client *client;
0179 
0180     /* protect device params updates (e.g state, gain) */
0181     struct mutex lock;
0182 
0183     /* device active status */
0184     bool als_dev_en;
0185     bool pxs_dev_en;
0186 
0187     struct iio_trigger *drdy_trigger0;
0188     s64 irq_timestamp;
0189 
0190     /* optimize runtime pm ops - enable/disable device only if needed */
0191     bool als_ps_need_en;
0192     bool pxs_ps_need_en;
0193     bool als_need_dis;
0194     bool pxs_need_dis;
0195 
0196     struct regmap *regmap;
0197 
0198     /*
0199      * Ensure correct naturally aligned timestamp.
0200      * Note that the read will put garbage data into
0201      * the padding but this should not be a problem
0202      */
0203     struct {
0204         __le16 channels[3];
0205         u8 garbage;
0206         s64 ts __aligned(8);
0207     } scan;
0208 };
0209 
0210 static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL);
0211 static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL);
0212 
0213 /*
0214  * Start with easy freq first, whole table of freq combinations is more
0215  * complicated.
0216  */
0217 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2.5 10");
0218 
0219 static struct attribute *rpr0521_attributes[] = {
0220     &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
0221     &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
0222     &iio_const_attr_sampling_frequency_available.dev_attr.attr,
0223     NULL,
0224 };
0225 
0226 static const struct attribute_group rpr0521_attribute_group = {
0227     .attrs = rpr0521_attributes,
0228 };
0229 
0230 /* Order of the channel data in buffer */
0231 enum rpr0521_scan_index_order {
0232     RPR0521_CHAN_INDEX_PXS,
0233     RPR0521_CHAN_INDEX_BOTH,
0234     RPR0521_CHAN_INDEX_IR,
0235 };
0236 
0237 static const unsigned long rpr0521_available_scan_masks[] = {
0238     BIT(RPR0521_CHAN_INDEX_PXS) | BIT(RPR0521_CHAN_INDEX_BOTH) |
0239     BIT(RPR0521_CHAN_INDEX_IR),
0240     0
0241 };
0242 
0243 static const struct iio_chan_spec rpr0521_channels[] = {
0244     {
0245         .type = IIO_PROXIMITY,
0246         .address = RPR0521_CHAN_PXS,
0247         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
0248             BIT(IIO_CHAN_INFO_OFFSET) |
0249             BIT(IIO_CHAN_INFO_SCALE),
0250         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
0251         .scan_index = RPR0521_CHAN_INDEX_PXS,
0252         .scan_type = {
0253             .sign = 'u',
0254             .realbits = 16,
0255             .storagebits = 16,
0256             .endianness = IIO_LE,
0257         },
0258     },
0259     {
0260         .type = IIO_INTENSITY,
0261         .modified = 1,
0262         .address = RPR0521_CHAN_ALS_DATA0,
0263         .channel2 = IIO_MOD_LIGHT_BOTH,
0264         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
0265             BIT(IIO_CHAN_INFO_SCALE),
0266         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
0267         .scan_index = RPR0521_CHAN_INDEX_BOTH,
0268         .scan_type = {
0269             .sign = 'u',
0270             .realbits = 16,
0271             .storagebits = 16,
0272             .endianness = IIO_LE,
0273         },
0274     },
0275     {
0276         .type = IIO_INTENSITY,
0277         .modified = 1,
0278         .address = RPR0521_CHAN_ALS_DATA1,
0279         .channel2 = IIO_MOD_LIGHT_IR,
0280         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
0281             BIT(IIO_CHAN_INFO_SCALE),
0282         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
0283         .scan_index = RPR0521_CHAN_INDEX_IR,
0284         .scan_type = {
0285             .sign = 'u',
0286             .realbits = 16,
0287             .storagebits = 16,
0288             .endianness = IIO_LE,
0289         },
0290     },
0291 };
0292 
0293 static int rpr0521_als_enable(struct rpr0521_data *data, u8 status)
0294 {
0295     int ret;
0296 
0297     ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
0298                  RPR0521_MODE_ALS_MASK,
0299                  status);
0300     if (ret < 0)
0301         return ret;
0302 
0303     if (status & RPR0521_MODE_ALS_MASK)
0304         data->als_dev_en = true;
0305     else
0306         data->als_dev_en = false;
0307 
0308     return 0;
0309 }
0310 
0311 static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status)
0312 {
0313     int ret;
0314 
0315     ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
0316                  RPR0521_MODE_PXS_MASK,
0317                  status);
0318     if (ret < 0)
0319         return ret;
0320 
0321     if (status & RPR0521_MODE_PXS_MASK)
0322         data->pxs_dev_en = true;
0323     else
0324         data->pxs_dev_en = false;
0325 
0326     return 0;
0327 }
0328 
0329 /**
0330  * rpr0521_set_power_state - handles runtime PM state and sensors enabled status
0331  *
0332  * @data: rpr0521 device private data
0333  * @on: state to be set for devices in @device_mask
0334  * @device_mask: bitmask specifying for which device we need to update @on state
0335  *
0336  * Calls for this function must be balanced so that each ON should have matching
0337  * OFF. Otherwise pm usage_count gets out of sync.
0338  */
0339 static int rpr0521_set_power_state(struct rpr0521_data *data, bool on,
0340                    u8 device_mask)
0341 {
0342 #ifdef CONFIG_PM
0343     int ret;
0344 
0345     if (device_mask & RPR0521_MODE_ALS_MASK) {
0346         data->als_ps_need_en = on;
0347         data->als_need_dis = !on;
0348     }
0349 
0350     if (device_mask & RPR0521_MODE_PXS_MASK) {
0351         data->pxs_ps_need_en = on;
0352         data->pxs_need_dis = !on;
0353     }
0354 
0355     /*
0356      * On: _resume() is called only when we are suspended
0357      * Off: _suspend() is called after delay if _resume() is not
0358      * called before that.
0359      * Note: If either measurement is re-enabled before _suspend(),
0360      * both stay enabled until _suspend().
0361      */
0362     if (on) {
0363         ret = pm_runtime_resume_and_get(&data->client->dev);
0364     } else {
0365         pm_runtime_mark_last_busy(&data->client->dev);
0366         ret = pm_runtime_put_autosuspend(&data->client->dev);
0367     }
0368     if (ret < 0) {
0369         dev_err(&data->client->dev,
0370             "Failed: rpr0521_set_power_state for %d, ret %d\n",
0371             on, ret);
0372         return ret;
0373     }
0374 
0375     if (on) {
0376         /* If _resume() was not called, enable measurement now. */
0377         if (data->als_ps_need_en) {
0378             ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
0379             if (ret)
0380                 return ret;
0381             data->als_ps_need_en = false;
0382         }
0383 
0384         if (data->pxs_ps_need_en) {
0385             ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
0386             if (ret)
0387                 return ret;
0388             data->pxs_ps_need_en = false;
0389         }
0390     }
0391 #endif
0392     return 0;
0393 }
0394 
0395 /* Interrupt register tells if this sensor caused the interrupt or not. */
0396 static inline bool rpr0521_is_triggered(struct rpr0521_data *data)
0397 {
0398     int ret;
0399     int reg;
0400 
0401     ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &reg);
0402     if (ret < 0)
0403         return false;   /* Reg read failed. */
0404     if (reg &
0405         (RPR0521_INTERRUPT_ALS_INT_STATUS_MASK |
0406         RPR0521_INTERRUPT_PS_INT_STATUS_MASK))
0407         return true;
0408     else
0409         return false;   /* Int not from this sensor. */
0410 }
0411 
0412 /* IRQ to trigger handler */
0413 static irqreturn_t rpr0521_drdy_irq_handler(int irq, void *private)
0414 {
0415     struct iio_dev *indio_dev = private;
0416     struct rpr0521_data *data = iio_priv(indio_dev);
0417 
0418     data->irq_timestamp = iio_get_time_ns(indio_dev);
0419     /*
0420      * We need to wake the thread to read the interrupt reg. It
0421      * is not possible to do that here because regmap_read takes a
0422      * mutex.
0423      */
0424 
0425     return IRQ_WAKE_THREAD;
0426 }
0427 
0428 static irqreturn_t rpr0521_drdy_irq_thread(int irq, void *private)
0429 {
0430     struct iio_dev *indio_dev = private;
0431     struct rpr0521_data *data = iio_priv(indio_dev);
0432 
0433     if (rpr0521_is_triggered(data)) {
0434         iio_trigger_poll_chained(data->drdy_trigger0);
0435         return IRQ_HANDLED;
0436     }
0437 
0438     return IRQ_NONE;
0439 }
0440 
0441 static irqreturn_t rpr0521_trigger_consumer_store_time(int irq, void *p)
0442 {
0443     struct iio_poll_func *pf = p;
0444     struct iio_dev *indio_dev = pf->indio_dev;
0445 
0446     /* Other trigger polls store time here. */
0447     if (!iio_trigger_using_own(indio_dev))
0448         pf->timestamp = iio_get_time_ns(indio_dev);
0449 
0450     return IRQ_WAKE_THREAD;
0451 }
0452 
0453 static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p)
0454 {
0455     struct iio_poll_func *pf = p;
0456     struct iio_dev *indio_dev = pf->indio_dev;
0457     struct rpr0521_data *data = iio_priv(indio_dev);
0458     int err;
0459 
0460     /* Use irq timestamp when reasonable. */
0461     if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) {
0462         pf->timestamp = data->irq_timestamp;
0463         data->irq_timestamp = 0;
0464     }
0465     /* Other chained trigger polls get timestamp only here. */
0466     if (!pf->timestamp)
0467         pf->timestamp = iio_get_time_ns(indio_dev);
0468 
0469     err = regmap_bulk_read(data->regmap, RPR0521_REG_PXS_DATA,
0470         data->scan.channels,
0471         (3 * 2) + 1);   /* 3 * 16-bit + (discarded) int clear reg. */
0472     if (!err)
0473         iio_push_to_buffers_with_timestamp(indio_dev,
0474                            &data->scan, pf->timestamp);
0475     else
0476         dev_err(&data->client->dev,
0477             "Trigger consumer can't read from sensor.\n");
0478     pf->timestamp = 0;
0479 
0480     iio_trigger_notify_done(indio_dev->trig);
0481 
0482     return IRQ_HANDLED;
0483 }
0484 
0485 static int rpr0521_write_int_enable(struct rpr0521_data *data)
0486 {
0487     int err;
0488 
0489     /* Interrupt after each measurement */
0490     err = regmap_update_bits(data->regmap, RPR0521_REG_PXS_CTRL,
0491         RPR0521_PXS_PERSISTENCE_MASK,
0492         RPR0521_PXS_PERSISTENCE_DRDY);
0493     if (err) {
0494         dev_err(&data->client->dev, "PS control reg write fail.\n");
0495         return -EBUSY;
0496         }
0497 
0498     /* Ignore latch and mode because of drdy */
0499     err = regmap_write(data->regmap, RPR0521_REG_INTERRUPT,
0500         RPR0521_INTERRUPT_INT_REASSERT_DISABLE |
0501         RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE |
0502         RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE
0503         );
0504     if (err) {
0505         dev_err(&data->client->dev, "Interrupt setup write fail.\n");
0506         return -EBUSY;
0507         }
0508 
0509     return 0;
0510 }
0511 
0512 static int rpr0521_write_int_disable(struct rpr0521_data *data)
0513 {
0514     /* Don't care of clearing mode, assert and latch. */
0515     return regmap_write(data->regmap, RPR0521_REG_INTERRUPT,
0516                 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE |
0517                 RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE
0518                 );
0519 }
0520 
0521 /*
0522  * Trigger producer enable / disable. Note that there will be trigs only when
0523  * measurement data is ready to be read.
0524  */
0525 static int rpr0521_pxs_drdy_set_state(struct iio_trigger *trigger,
0526     bool enable_drdy)
0527 {
0528     struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger);
0529     struct rpr0521_data *data = iio_priv(indio_dev);
0530     int err;
0531 
0532     if (enable_drdy)
0533         err = rpr0521_write_int_enable(data);
0534     else
0535         err = rpr0521_write_int_disable(data);
0536     if (err)
0537         dev_err(&data->client->dev, "rpr0521_pxs_drdy_set_state failed\n");
0538 
0539     return err;
0540 }
0541 
0542 static const struct iio_trigger_ops rpr0521_trigger_ops = {
0543     .set_trigger_state = rpr0521_pxs_drdy_set_state,
0544     };
0545 
0546 
0547 static int rpr0521_buffer_preenable(struct iio_dev *indio_dev)
0548 {
0549     int err;
0550     struct rpr0521_data *data = iio_priv(indio_dev);
0551 
0552     mutex_lock(&data->lock);
0553     err = rpr0521_set_power_state(data, true,
0554         (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK));
0555     mutex_unlock(&data->lock);
0556     if (err)
0557         dev_err(&data->client->dev, "_buffer_preenable fail\n");
0558 
0559     return err;
0560 }
0561 
0562 static int rpr0521_buffer_postdisable(struct iio_dev *indio_dev)
0563 {
0564     int err;
0565     struct rpr0521_data *data = iio_priv(indio_dev);
0566 
0567     mutex_lock(&data->lock);
0568     err = rpr0521_set_power_state(data, false,
0569         (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK));
0570     mutex_unlock(&data->lock);
0571     if (err)
0572         dev_err(&data->client->dev, "_buffer_postdisable fail\n");
0573 
0574     return err;
0575 }
0576 
0577 static const struct iio_buffer_setup_ops rpr0521_buffer_setup_ops = {
0578     .preenable = rpr0521_buffer_preenable,
0579     .postdisable = rpr0521_buffer_postdisable,
0580 };
0581 
0582 static int rpr0521_get_gain(struct rpr0521_data *data, int chan,
0583                 int *val, int *val2)
0584 {
0585     int ret, reg, idx;
0586 
0587     ret = regmap_read(data->regmap, rpr0521_gain[chan].reg, &reg);
0588     if (ret < 0)
0589         return ret;
0590 
0591     idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift;
0592     *val = rpr0521_gain[chan].gain[idx].scale;
0593     *val2 = rpr0521_gain[chan].gain[idx].uscale;
0594 
0595     return 0;
0596 }
0597 
0598 static int rpr0521_set_gain(struct rpr0521_data *data, int chan,
0599                 int val, int val2)
0600 {
0601     int i, idx = -EINVAL;
0602 
0603     /* get gain index */
0604     for (i = 0; i < rpr0521_gain[chan].size; i++)
0605         if (val == rpr0521_gain[chan].gain[i].scale &&
0606             val2 == rpr0521_gain[chan].gain[i].uscale) {
0607             idx = i;
0608             break;
0609         }
0610 
0611     if (idx < 0)
0612         return idx;
0613 
0614     return regmap_update_bits(data->regmap, rpr0521_gain[chan].reg,
0615                   rpr0521_gain[chan].mask,
0616                   idx << rpr0521_gain[chan].shift);
0617 }
0618 
0619 static int rpr0521_read_samp_freq(struct rpr0521_data *data,
0620                 enum iio_chan_type chan_type,
0621                 int *val, int *val2)
0622 {
0623     int reg, ret;
0624 
0625     ret = regmap_read(data->regmap, RPR0521_REG_MODE_CTRL, &reg);
0626     if (ret < 0)
0627         return ret;
0628 
0629     reg &= RPR0521_MODE_MEAS_TIME_MASK;
0630     if (reg >= ARRAY_SIZE(rpr0521_samp_freq_i))
0631         return -EINVAL;
0632 
0633     switch (chan_type) {
0634     case IIO_INTENSITY:
0635         *val = rpr0521_samp_freq_i[reg].als_hz;
0636         *val2 = rpr0521_samp_freq_i[reg].als_uhz;
0637         return 0;
0638 
0639     case IIO_PROXIMITY:
0640         *val = rpr0521_samp_freq_i[reg].pxs_hz;
0641         *val2 = rpr0521_samp_freq_i[reg].pxs_uhz;
0642         return 0;
0643 
0644     default:
0645         return -EINVAL;
0646     }
0647 }
0648 
0649 static int rpr0521_write_samp_freq_common(struct rpr0521_data *data,
0650                 enum iio_chan_type chan_type,
0651                 int val, int val2)
0652 {
0653     int i;
0654 
0655     /*
0656      * Ignore channel
0657      * both pxs and als are setup only to same freq because of simplicity
0658      */
0659     switch (val) {
0660     case 0:
0661         i = 0;
0662         break;
0663 
0664     case 2:
0665         if (val2 != 500000)
0666             return -EINVAL;
0667 
0668         i = 11;
0669         break;
0670 
0671     case 10:
0672         i = 6;
0673         break;
0674 
0675     default:
0676         return -EINVAL;
0677     }
0678 
0679     return regmap_update_bits(data->regmap,
0680         RPR0521_REG_MODE_CTRL,
0681         RPR0521_MODE_MEAS_TIME_MASK,
0682         i);
0683 }
0684 
0685 static int rpr0521_read_ps_offset(struct rpr0521_data *data, int *offset)
0686 {
0687     int ret;
0688     __le16 buffer;
0689 
0690     ret = regmap_bulk_read(data->regmap,
0691         RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));
0692 
0693     if (ret < 0) {
0694         dev_err(&data->client->dev, "Failed to read PS OFFSET register\n");
0695         return ret;
0696     }
0697     *offset = le16_to_cpu(buffer);
0698 
0699     return ret;
0700 }
0701 
0702 static int rpr0521_write_ps_offset(struct rpr0521_data *data, int offset)
0703 {
0704     int ret;
0705     __le16 buffer;
0706 
0707     buffer = cpu_to_le16(offset & 0x3ff);
0708     ret = regmap_raw_write(data->regmap,
0709         RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));
0710 
0711     if (ret < 0) {
0712         dev_err(&data->client->dev, "Failed to write PS OFFSET register\n");
0713         return ret;
0714     }
0715 
0716     return ret;
0717 }
0718 
0719 static int rpr0521_read_raw(struct iio_dev *indio_dev,
0720                 struct iio_chan_spec const *chan, int *val,
0721                 int *val2, long mask)
0722 {
0723     struct rpr0521_data *data = iio_priv(indio_dev);
0724     int ret;
0725     int busy;
0726     u8 device_mask;
0727     __le16 raw_data;
0728 
0729     switch (mask) {
0730     case IIO_CHAN_INFO_RAW:
0731         if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY)
0732             return -EINVAL;
0733 
0734         busy = iio_device_claim_direct_mode(indio_dev);
0735         if (busy)
0736             return -EBUSY;
0737 
0738         device_mask = rpr0521_data_reg[chan->address].device_mask;
0739 
0740         mutex_lock(&data->lock);
0741         ret = rpr0521_set_power_state(data, true, device_mask);
0742         if (ret < 0)
0743             goto rpr0521_read_raw_out;
0744 
0745         ret = regmap_bulk_read(data->regmap,
0746                        rpr0521_data_reg[chan->address].address,
0747                        &raw_data, sizeof(raw_data));
0748         if (ret < 0) {
0749             rpr0521_set_power_state(data, false, device_mask);
0750             goto rpr0521_read_raw_out;
0751         }
0752 
0753         ret = rpr0521_set_power_state(data, false, device_mask);
0754 
0755 rpr0521_read_raw_out:
0756         mutex_unlock(&data->lock);
0757         iio_device_release_direct_mode(indio_dev);
0758         if (ret < 0)
0759             return ret;
0760 
0761         *val = le16_to_cpu(raw_data);
0762 
0763         return IIO_VAL_INT;
0764 
0765     case IIO_CHAN_INFO_SCALE:
0766         mutex_lock(&data->lock);
0767         ret = rpr0521_get_gain(data, chan->address, val, val2);
0768         mutex_unlock(&data->lock);
0769         if (ret < 0)
0770             return ret;
0771 
0772         return IIO_VAL_INT_PLUS_MICRO;
0773 
0774     case IIO_CHAN_INFO_SAMP_FREQ:
0775         mutex_lock(&data->lock);
0776         ret = rpr0521_read_samp_freq(data, chan->type, val, val2);
0777         mutex_unlock(&data->lock);
0778         if (ret < 0)
0779             return ret;
0780 
0781         return IIO_VAL_INT_PLUS_MICRO;
0782 
0783     case IIO_CHAN_INFO_OFFSET:
0784         mutex_lock(&data->lock);
0785         ret = rpr0521_read_ps_offset(data, val);
0786         mutex_unlock(&data->lock);
0787         if (ret < 0)
0788             return ret;
0789 
0790         return IIO_VAL_INT;
0791 
0792     default:
0793         return -EINVAL;
0794     }
0795 }
0796 
0797 static int rpr0521_write_raw(struct iio_dev *indio_dev,
0798                  struct iio_chan_spec const *chan, int val,
0799                  int val2, long mask)
0800 {
0801     struct rpr0521_data *data = iio_priv(indio_dev);
0802     int ret;
0803 
0804     switch (mask) {
0805     case IIO_CHAN_INFO_SCALE:
0806         mutex_lock(&data->lock);
0807         ret = rpr0521_set_gain(data, chan->address, val, val2);
0808         mutex_unlock(&data->lock);
0809 
0810         return ret;
0811 
0812     case IIO_CHAN_INFO_SAMP_FREQ:
0813         mutex_lock(&data->lock);
0814         ret = rpr0521_write_samp_freq_common(data, chan->type,
0815                              val, val2);
0816         mutex_unlock(&data->lock);
0817 
0818         return ret;
0819 
0820     case IIO_CHAN_INFO_OFFSET:
0821         mutex_lock(&data->lock);
0822         ret = rpr0521_write_ps_offset(data, val);
0823         mutex_unlock(&data->lock);
0824 
0825         return ret;
0826 
0827     default:
0828         return -EINVAL;
0829     }
0830 }
0831 
0832 static const struct iio_info rpr0521_info = {
0833     .read_raw   = rpr0521_read_raw,
0834     .write_raw  = rpr0521_write_raw,
0835     .attrs      = &rpr0521_attribute_group,
0836 };
0837 
0838 static int rpr0521_init(struct rpr0521_data *data)
0839 {
0840     int ret;
0841     int id;
0842 
0843     ret = regmap_read(data->regmap, RPR0521_REG_ID, &id);
0844     if (ret < 0) {
0845         dev_err(&data->client->dev, "Failed to read REG_ID register\n");
0846         return ret;
0847     }
0848 
0849     if (id != RPR0521_MANUFACT_ID) {
0850         dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",
0851             id, RPR0521_MANUFACT_ID);
0852         return -ENODEV;
0853     }
0854 
0855     /* set default measurement time - 100 ms for both ALS and PS */
0856     ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
0857                  RPR0521_MODE_MEAS_TIME_MASK,
0858                  RPR0521_DEFAULT_MEAS_TIME);
0859     if (ret) {
0860         pr_err("regmap_update_bits returned %d\n", ret);
0861         return ret;
0862     }
0863 
0864 #ifndef CONFIG_PM
0865     ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
0866     if (ret < 0)
0867         return ret;
0868     ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
0869     if (ret < 0)
0870         return ret;
0871 #endif
0872 
0873     data->irq_timestamp = 0;
0874 
0875     return 0;
0876 }
0877 
0878 static int rpr0521_poweroff(struct rpr0521_data *data)
0879 {
0880     int ret;
0881     int tmp;
0882 
0883     ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
0884                  RPR0521_MODE_ALS_MASK |
0885                  RPR0521_MODE_PXS_MASK,
0886                  RPR0521_MODE_ALS_DISABLE |
0887                  RPR0521_MODE_PXS_DISABLE);
0888     if (ret < 0)
0889         return ret;
0890 
0891     data->als_dev_en = false;
0892     data->pxs_dev_en = false;
0893 
0894     /*
0895      * Int pin keeps state after power off. Set pin to high impedance
0896      * mode to prevent power drain.
0897      */
0898     ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &tmp);
0899     if (ret) {
0900         dev_err(&data->client->dev, "Failed to reset int pin.\n");
0901         return ret;
0902     }
0903 
0904     return 0;
0905 }
0906 
0907 static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg)
0908 {
0909     switch (reg) {
0910     case RPR0521_REG_MODE_CTRL:
0911     case RPR0521_REG_ALS_CTRL:
0912     case RPR0521_REG_PXS_CTRL:
0913         return false;
0914     default:
0915         return true;
0916     }
0917 }
0918 
0919 static const struct regmap_config rpr0521_regmap_config = {
0920     .name       = RPR0521_REGMAP_NAME,
0921 
0922     .reg_bits   = 8,
0923     .val_bits   = 8,
0924 
0925     .max_register   = RPR0521_REG_ID,
0926     .cache_type = REGCACHE_RBTREE,
0927     .volatile_reg   = rpr0521_is_volatile_reg,
0928 };
0929 
0930 static int rpr0521_probe(struct i2c_client *client,
0931              const struct i2c_device_id *id)
0932 {
0933     struct rpr0521_data *data;
0934     struct iio_dev *indio_dev;
0935     struct regmap *regmap;
0936     int ret;
0937 
0938     indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
0939     if (!indio_dev)
0940         return -ENOMEM;
0941 
0942     regmap = devm_regmap_init_i2c(client, &rpr0521_regmap_config);
0943     if (IS_ERR(regmap)) {
0944         dev_err(&client->dev, "regmap_init failed!\n");
0945         return PTR_ERR(regmap);
0946     }
0947 
0948     data = iio_priv(indio_dev);
0949     i2c_set_clientdata(client, indio_dev);
0950     data->client = client;
0951     data->regmap = regmap;
0952 
0953     mutex_init(&data->lock);
0954 
0955     indio_dev->info = &rpr0521_info;
0956     indio_dev->name = RPR0521_DRV_NAME;
0957     indio_dev->channels = rpr0521_channels;
0958     indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels);
0959     indio_dev->modes = INDIO_DIRECT_MODE;
0960 
0961     ret = rpr0521_init(data);
0962     if (ret < 0) {
0963         dev_err(&client->dev, "rpr0521 chip init failed\n");
0964         return ret;
0965     }
0966 
0967     ret = pm_runtime_set_active(&client->dev);
0968     if (ret < 0)
0969         goto err_poweroff;
0970 
0971     pm_runtime_enable(&client->dev);
0972     pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS);
0973     pm_runtime_use_autosuspend(&client->dev);
0974 
0975     /*
0976      * If sensor write/read is needed in _probe after _use_autosuspend,
0977      * sensor needs to be _resumed first using rpr0521_set_power_state().
0978      */
0979 
0980     /* IRQ to trigger setup */
0981     if (client->irq) {
0982         /* Trigger0 producer setup */
0983         data->drdy_trigger0 = devm_iio_trigger_alloc(
0984             indio_dev->dev.parent,
0985             "%s-dev%d", indio_dev->name, iio_device_id(indio_dev));
0986         if (!data->drdy_trigger0) {
0987             ret = -ENOMEM;
0988             goto err_pm_disable;
0989         }
0990         data->drdy_trigger0->ops = &rpr0521_trigger_ops;
0991         indio_dev->available_scan_masks = rpr0521_available_scan_masks;
0992         iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev);
0993 
0994         /* Ties irq to trigger producer handler. */
0995         ret = devm_request_threaded_irq(&client->dev, client->irq,
0996             rpr0521_drdy_irq_handler, rpr0521_drdy_irq_thread,
0997             IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
0998             RPR0521_IRQ_NAME, indio_dev);
0999         if (ret < 0) {
1000             dev_err(&client->dev, "request irq %d for trigger0 failed\n",
1001                 client->irq);
1002             goto err_pm_disable;
1003             }
1004 
1005         ret = devm_iio_trigger_register(indio_dev->dev.parent,
1006                         data->drdy_trigger0);
1007         if (ret) {
1008             dev_err(&client->dev, "iio trigger register failed\n");
1009             goto err_pm_disable;
1010         }
1011 
1012         /*
1013          * Now whole pipe from physical interrupt (irq defined by
1014          * devicetree to device) to trigger0 output is set up.
1015          */
1016 
1017         /* Trigger consumer setup */
1018         ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent,
1019             indio_dev,
1020             rpr0521_trigger_consumer_store_time,
1021             rpr0521_trigger_consumer_handler,
1022             &rpr0521_buffer_setup_ops);
1023         if (ret < 0) {
1024             dev_err(&client->dev, "iio triggered buffer setup failed\n");
1025             goto err_pm_disable;
1026         }
1027     }
1028 
1029     ret = iio_device_register(indio_dev);
1030     if (ret)
1031         goto err_pm_disable;
1032 
1033     return 0;
1034 
1035 err_pm_disable:
1036     pm_runtime_disable(&client->dev);
1037     pm_runtime_set_suspended(&client->dev);
1038 err_poweroff:
1039     rpr0521_poweroff(data);
1040 
1041     return ret;
1042 }
1043 
1044 static int rpr0521_remove(struct i2c_client *client)
1045 {
1046     struct iio_dev *indio_dev = i2c_get_clientdata(client);
1047 
1048     iio_device_unregister(indio_dev);
1049 
1050     pm_runtime_disable(&client->dev);
1051     pm_runtime_set_suspended(&client->dev);
1052 
1053     rpr0521_poweroff(iio_priv(indio_dev));
1054 
1055     return 0;
1056 }
1057 
1058 static int rpr0521_runtime_suspend(struct device *dev)
1059 {
1060     struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1061     struct rpr0521_data *data = iio_priv(indio_dev);
1062     int ret;
1063 
1064     mutex_lock(&data->lock);
1065     /* If measurements are enabled, enable them on resume */
1066     if (!data->als_need_dis)
1067         data->als_ps_need_en = data->als_dev_en;
1068     if (!data->pxs_need_dis)
1069         data->pxs_ps_need_en = data->pxs_dev_en;
1070 
1071     /* disable channels and sets {als,pxs}_dev_en to false */
1072     ret = rpr0521_poweroff(data);
1073     regcache_mark_dirty(data->regmap);
1074     mutex_unlock(&data->lock);
1075 
1076     return ret;
1077 }
1078 
1079 static int rpr0521_runtime_resume(struct device *dev)
1080 {
1081     struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1082     struct rpr0521_data *data = iio_priv(indio_dev);
1083     int ret;
1084 
1085     regcache_sync(data->regmap);
1086     if (data->als_ps_need_en) {
1087         ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
1088         if (ret < 0)
1089             return ret;
1090         data->als_ps_need_en = false;
1091     }
1092 
1093     if (data->pxs_ps_need_en) {
1094         ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
1095         if (ret < 0)
1096             return ret;
1097         data->pxs_ps_need_en = false;
1098     }
1099     msleep(100);    //wait for first measurement result
1100 
1101     return 0;
1102 }
1103 
1104 static const struct dev_pm_ops rpr0521_pm_ops = {
1105     RUNTIME_PM_OPS(rpr0521_runtime_suspend, rpr0521_runtime_resume, NULL)
1106 };
1107 
1108 static const struct acpi_device_id rpr0521_acpi_match[] = {
1109     {"RPR0521", 0},
1110     { }
1111 };
1112 MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match);
1113 
1114 static const struct i2c_device_id rpr0521_id[] = {
1115     {"rpr0521", 0},
1116     { }
1117 };
1118 
1119 MODULE_DEVICE_TABLE(i2c, rpr0521_id);
1120 
1121 static struct i2c_driver rpr0521_driver = {
1122     .driver = {
1123         .name   = RPR0521_DRV_NAME,
1124         .pm = pm_ptr(&rpr0521_pm_ops),
1125         .acpi_match_table = ACPI_PTR(rpr0521_acpi_match),
1126     },
1127     .probe      = rpr0521_probe,
1128     .remove     = rpr0521_remove,
1129     .id_table   = rpr0521_id,
1130 };
1131 
1132 module_i2c_driver(rpr0521_driver);
1133 
1134 MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
1135 MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver");
1136 MODULE_LICENSE("GPL v2");
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