// SPDX-License-Identifier: GPL-2.0-only /* * RPR-0521 ROHM Ambient Light and Proximity Sensor * * Copyright (c) 2015, Intel Corporation. * * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38). * * TODO: illuminance channel */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define RPR0521_REG_SYSTEM_CTRL 0x40 #define RPR0521_REG_MODE_CTRL 0x41 #define RPR0521_REG_ALS_CTRL 0x42 #define RPR0521_REG_PXS_CTRL 0x43 #define RPR0521_REG_PXS_DATA 0x44 /* 16-bit, little endian */ #define RPR0521_REG_ALS_DATA0 0x46 /* 16-bit, little endian */ #define RPR0521_REG_ALS_DATA1 0x48 /* 16-bit, little endian */ #define RPR0521_REG_INTERRUPT 0x4A #define RPR0521_REG_PS_OFFSET_LSB 0x53 #define RPR0521_REG_ID 0x92 #define RPR0521_MODE_ALS_MASK BIT(7) #define RPR0521_MODE_PXS_MASK BIT(6) #define RPR0521_MODE_MEAS_TIME_MASK GENMASK(3, 0) #define RPR0521_ALS_DATA0_GAIN_MASK GENMASK(5, 4) #define RPR0521_ALS_DATA0_GAIN_SHIFT 4 #define RPR0521_ALS_DATA1_GAIN_MASK GENMASK(3, 2) #define RPR0521_ALS_DATA1_GAIN_SHIFT 2 #define RPR0521_PXS_GAIN_MASK GENMASK(5, 4) #define RPR0521_PXS_GAIN_SHIFT 4 #define RPR0521_PXS_PERSISTENCE_MASK GENMASK(3, 0) #define RPR0521_INTERRUPT_INT_TRIG_PS_MASK BIT(0) #define RPR0521_INTERRUPT_INT_TRIG_ALS_MASK BIT(1) #define RPR0521_INTERRUPT_INT_REASSERT_MASK BIT(3) #define RPR0521_INTERRUPT_ALS_INT_STATUS_MASK BIT(6) #define RPR0521_INTERRUPT_PS_INT_STATUS_MASK BIT(7) #define RPR0521_MODE_ALS_ENABLE BIT(7) #define RPR0521_MODE_ALS_DISABLE 0x00 #define RPR0521_MODE_PXS_ENABLE BIT(6) #define RPR0521_MODE_PXS_DISABLE 0x00 #define RPR0521_PXS_PERSISTENCE_DRDY 0x00 #define RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE BIT(0) #define RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE 0x00 #define RPR0521_INTERRUPT_INT_TRIG_ALS_ENABLE BIT(1) #define RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE 0x00 #define RPR0521_INTERRUPT_INT_REASSERT_ENABLE BIT(3) #define RPR0521_INTERRUPT_INT_REASSERT_DISABLE 0x00 #define RPR0521_MANUFACT_ID 0xE0 #define RPR0521_DEFAULT_MEAS_TIME 0x06 /* ALS - 100ms, PXS - 100ms */ #define RPR0521_DRV_NAME "RPR0521" #define RPR0521_IRQ_NAME "rpr0521_event" #define RPR0521_REGMAP_NAME "rpr0521_regmap" #define RPR0521_SLEEP_DELAY_MS 2000 #define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1" #define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1" struct rpr0521_gain { int scale; int uscale; }; static const struct rpr0521_gain rpr0521_als_gain[4] = { {1, 0}, /* x1 */ {0, 500000}, /* x2 */ {0, 15625}, /* x64 */ {0, 7812}, /* x128 */ }; static const struct rpr0521_gain rpr0521_pxs_gain[3] = { {1, 0}, /* x1 */ {0, 500000}, /* x2 */ {0, 125000}, /* x4 */ }; enum rpr0521_channel { RPR0521_CHAN_PXS, RPR0521_CHAN_ALS_DATA0, RPR0521_CHAN_ALS_DATA1, }; struct rpr0521_reg_desc { u8 address; u8 device_mask; }; static const struct rpr0521_reg_desc rpr0521_data_reg[] = { [RPR0521_CHAN_PXS] = { .address = RPR0521_REG_PXS_DATA, .device_mask = RPR0521_MODE_PXS_MASK, }, [RPR0521_CHAN_ALS_DATA0] = { .address = RPR0521_REG_ALS_DATA0, .device_mask = RPR0521_MODE_ALS_MASK, }, [RPR0521_CHAN_ALS_DATA1] = { .address = RPR0521_REG_ALS_DATA1, .device_mask = RPR0521_MODE_ALS_MASK, }, }; static const struct rpr0521_gain_info { u8 reg; u8 mask; u8 shift; const struct rpr0521_gain *gain; int size; } rpr0521_gain[] = { [RPR0521_CHAN_PXS] = { .reg = RPR0521_REG_PXS_CTRL, .mask = RPR0521_PXS_GAIN_MASK, .shift = RPR0521_PXS_GAIN_SHIFT, .gain = rpr0521_pxs_gain, .size = ARRAY_SIZE(rpr0521_pxs_gain), }, [RPR0521_CHAN_ALS_DATA0] = { .reg = RPR0521_REG_ALS_CTRL, .mask = RPR0521_ALS_DATA0_GAIN_MASK, .shift = RPR0521_ALS_DATA0_GAIN_SHIFT, .gain = rpr0521_als_gain, .size = ARRAY_SIZE(rpr0521_als_gain), }, [RPR0521_CHAN_ALS_DATA1] = { .reg = RPR0521_REG_ALS_CTRL, .mask = RPR0521_ALS_DATA1_GAIN_MASK, .shift = RPR0521_ALS_DATA1_GAIN_SHIFT, .gain = rpr0521_als_gain, .size = ARRAY_SIZE(rpr0521_als_gain), }, }; struct rpr0521_samp_freq { int als_hz; int als_uhz; int pxs_hz; int pxs_uhz; }; static const struct rpr0521_samp_freq rpr0521_samp_freq_i[13] = { /* {ALS, PXS}, W==currently writable option */ {0, 0, 0, 0}, /* W0000, 0=standby */ {0, 0, 100, 0}, /* 0001 */ {0, 0, 25, 0}, /* 0010 */ {0, 0, 10, 0}, /* 0011 */ {0, 0, 2, 500000}, /* 0100 */ {10, 0, 20, 0}, /* 0101 */ {10, 0, 10, 0}, /* W0110 */ {10, 0, 2, 500000}, /* 0111 */ {2, 500000, 20, 0}, /* 1000, measurement 100ms, sleep 300ms */ {2, 500000, 10, 0}, /* 1001, measurement 100ms, sleep 300ms */ {2, 500000, 0, 0}, /* 1010, high sensitivity mode */ {2, 500000, 2, 500000}, /* W1011, high sensitivity mode */ {20, 0, 20, 0} /* 1100, ALS_data x 0.5, see specification P.18 */ }; struct rpr0521_data { struct i2c_client *client; /* protect device params updates (e.g state, gain) */ struct mutex lock; /* device active status */ bool als_dev_en; bool pxs_dev_en; struct iio_trigger *drdy_trigger0; s64 irq_timestamp; /* optimize runtime pm ops - enable/disable device only if needed */ bool als_ps_need_en; bool pxs_ps_need_en; bool als_need_dis; bool pxs_need_dis; struct regmap *regmap; /* * Ensure correct naturally aligned timestamp. * Note that the read will put garbage data into * the padding but this should not be a problem */ struct { __le16 channels[3]; u8 garbage; s64 ts __aligned(8); } scan; }; static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL); static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL); /* * Start with easy freq first, whole table of freq combinations is more * complicated. */ static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2.5 10"); static struct attribute *rpr0521_attributes[] = { &iio_const_attr_in_intensity_scale_available.dev_attr.attr, &iio_const_attr_in_proximity_scale_available.dev_attr.attr, &iio_const_attr_sampling_frequency_available.dev_attr.attr, NULL, }; static const struct attribute_group rpr0521_attribute_group = { .attrs = rpr0521_attributes, }; /* Order of the channel data in buffer */ enum rpr0521_scan_index_order { RPR0521_CHAN_INDEX_PXS, RPR0521_CHAN_INDEX_BOTH, RPR0521_CHAN_INDEX_IR, }; static const unsigned long rpr0521_available_scan_masks[] = { BIT(RPR0521_CHAN_INDEX_PXS) | BIT(RPR0521_CHAN_INDEX_BOTH) | BIT(RPR0521_CHAN_INDEX_IR), 0 }; static const struct iio_chan_spec rpr0521_channels[] = { { .type = IIO_PROXIMITY, .address = RPR0521_CHAN_PXS, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), .scan_index = RPR0521_CHAN_INDEX_PXS, .scan_type = { .sign = 'u', .realbits = 16, .storagebits = 16, .endianness = IIO_LE, }, }, { .type = IIO_INTENSITY, .modified = 1, .address = RPR0521_CHAN_ALS_DATA0, .channel2 = IIO_MOD_LIGHT_BOTH, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), .scan_index = RPR0521_CHAN_INDEX_BOTH, .scan_type = { .sign = 'u', .realbits = 16, .storagebits = 16, .endianness = IIO_LE, }, }, { .type = IIO_INTENSITY, .modified = 1, .address = RPR0521_CHAN_ALS_DATA1, .channel2 = IIO_MOD_LIGHT_IR, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), .scan_index = RPR0521_CHAN_INDEX_IR, .scan_type = { .sign = 'u', .realbits = 16, .storagebits = 16, .endianness = IIO_LE, }, }, }; static int rpr0521_als_enable(struct rpr0521_data *data, u8 status) { int ret; ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, RPR0521_MODE_ALS_MASK, status); if (ret < 0) return ret; if (status & RPR0521_MODE_ALS_MASK) data->als_dev_en = true; else data->als_dev_en = false; return 0; } static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status) { int ret; ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, RPR0521_MODE_PXS_MASK, status); if (ret < 0) return ret; if (status & RPR0521_MODE_PXS_MASK) data->pxs_dev_en = true; else data->pxs_dev_en = false; return 0; } /** * rpr0521_set_power_state - handles runtime PM state and sensors enabled status * * @data: rpr0521 device private data * @on: state to be set for devices in @device_mask * @device_mask: bitmask specifying for which device we need to update @on state * * Calls for this function must be balanced so that each ON should have matching * OFF. Otherwise pm usage_count gets out of sync. */ static int rpr0521_set_power_state(struct rpr0521_data *data, bool on, u8 device_mask) { #ifdef CONFIG_PM int ret; if (device_mask & RPR0521_MODE_ALS_MASK) { data->als_ps_need_en = on; data->als_need_dis = !on; } if (device_mask & RPR0521_MODE_PXS_MASK) { data->pxs_ps_need_en = on; data->pxs_need_dis = !on; } /* * On: _resume() is called only when we are suspended * Off: _suspend() is called after delay if _resume() is not * called before that. * Note: If either measurement is re-enabled before _suspend(), * both stay enabled until _suspend(). */ if (on) { ret = pm_runtime_resume_and_get(&data->client->dev); } else { pm_runtime_mark_last_busy(&data->client->dev); ret = pm_runtime_put_autosuspend(&data->client->dev); } if (ret < 0) { dev_err(&data->client->dev, "Failed: rpr0521_set_power_state for %d, ret %d\n", on, ret); return ret; } if (on) { /* If _resume() was not called, enable measurement now. */ if (data->als_ps_need_en) { ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); if (ret) return ret; data->als_ps_need_en = false; } if (data->pxs_ps_need_en) { ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); if (ret) return ret; data->pxs_ps_need_en = false; } } #endif return 0; } /* Interrupt register tells if this sensor caused the interrupt or not. */ static inline bool rpr0521_is_triggered(struct rpr0521_data *data) { int ret; int reg; ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, ®); if (ret < 0) return false; /* Reg read failed. */ if (reg & (RPR0521_INTERRUPT_ALS_INT_STATUS_MASK | RPR0521_INTERRUPT_PS_INT_STATUS_MASK)) return true; else return false; /* Int not from this sensor. */ } /* IRQ to trigger handler */ static irqreturn_t rpr0521_drdy_irq_handler(int irq, void *private) { struct iio_dev *indio_dev = private; struct rpr0521_data *data = iio_priv(indio_dev); data->irq_timestamp = iio_get_time_ns(indio_dev); /* * We need to wake the thread to read the interrupt reg. It * is not possible to do that here because regmap_read takes a * mutex. */ return IRQ_WAKE_THREAD; } static irqreturn_t rpr0521_drdy_irq_thread(int irq, void *private) { struct iio_dev *indio_dev = private; struct rpr0521_data *data = iio_priv(indio_dev); if (rpr0521_is_triggered(data)) { iio_trigger_poll_nested(data->drdy_trigger0); return IRQ_HANDLED; } return IRQ_NONE; } static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p) { struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct rpr0521_data *data = iio_priv(indio_dev); int err; /* Use irq timestamp when reasonable. */ if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) { pf->timestamp = data->irq_timestamp; data->irq_timestamp = 0; } /* Other chained trigger polls get timestamp only here. */ if (!pf->timestamp) pf->timestamp = iio_get_time_ns(indio_dev); err = regmap_bulk_read(data->regmap, RPR0521_REG_PXS_DATA, data->scan.channels, (3 * 2) + 1); /* 3 * 16-bit + (discarded) int clear reg. */ if (!err) iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, pf->timestamp); else dev_err(&data->client->dev, "Trigger consumer can't read from sensor.\n"); pf->timestamp = 0; iio_trigger_notify_done(indio_dev->trig); return IRQ_HANDLED; } static int rpr0521_write_int_enable(struct rpr0521_data *data) { int err; /* Interrupt after each measurement */ err = regmap_update_bits(data->regmap, RPR0521_REG_PXS_CTRL, RPR0521_PXS_PERSISTENCE_MASK, RPR0521_PXS_PERSISTENCE_DRDY); if (err) { dev_err(&data->client->dev, "PS control reg write fail.\n"); return -EBUSY; } /* Ignore latch and mode because of drdy */ err = regmap_write(data->regmap, RPR0521_REG_INTERRUPT, RPR0521_INTERRUPT_INT_REASSERT_DISABLE | RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE | RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE ); if (err) { dev_err(&data->client->dev, "Interrupt setup write fail.\n"); return -EBUSY; } return 0; } static int rpr0521_write_int_disable(struct rpr0521_data *data) { /* Don't care of clearing mode, assert and latch. */ return regmap_write(data->regmap, RPR0521_REG_INTERRUPT, RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE | RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE ); } /* * Trigger producer enable / disable. Note that there will be trigs only when * measurement data is ready to be read. */ static int rpr0521_pxs_drdy_set_state(struct iio_trigger *trigger, bool enable_drdy) { struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger); struct rpr0521_data *data = iio_priv(indio_dev); int err; if (enable_drdy) err = rpr0521_write_int_enable(data); else err = rpr0521_write_int_disable(data); if (err) dev_err(&data->client->dev, "rpr0521_pxs_drdy_set_state failed\n"); return err; } static const struct iio_trigger_ops rpr0521_trigger_ops = { .set_trigger_state = rpr0521_pxs_drdy_set_state, }; static int rpr0521_buffer_preenable(struct iio_dev *indio_dev) { int err; struct rpr0521_data *data = iio_priv(indio_dev); mutex_lock(&data->lock); err = rpr0521_set_power_state(data, true, (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK)); mutex_unlock(&data->lock); if (err) dev_err(&data->client->dev, "_buffer_preenable fail\n"); return err; } static int rpr0521_buffer_postdisable(struct iio_dev *indio_dev) { int err; struct rpr0521_data *data = iio_priv(indio_dev); mutex_lock(&data->lock); err = rpr0521_set_power_state(data, false, (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK)); mutex_unlock(&data->lock); if (err) dev_err(&data->client->dev, "_buffer_postdisable fail\n"); return err; } static const struct iio_buffer_setup_ops rpr0521_buffer_setup_ops = { .preenable = rpr0521_buffer_preenable, .postdisable = rpr0521_buffer_postdisable, }; static int rpr0521_get_gain(struct rpr0521_data *data, int chan, int *val, int *val2) { int ret, reg, idx; ret = regmap_read(data->regmap, rpr0521_gain[chan].reg, ®); if (ret < 0) return ret; idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift; *val = rpr0521_gain[chan].gain[idx].scale; *val2 = rpr0521_gain[chan].gain[idx].uscale; return 0; } static int rpr0521_set_gain(struct rpr0521_data *data, int chan, int val, int val2) { int i, idx = -EINVAL; /* get gain index */ for (i = 0; i < rpr0521_gain[chan].size; i++) if (val == rpr0521_gain[chan].gain[i].scale && val2 == rpr0521_gain[chan].gain[i].uscale) { idx = i; break; } if (idx < 0) return idx; return regmap_update_bits(data->regmap, rpr0521_gain[chan].reg, rpr0521_gain[chan].mask, idx << rpr0521_gain[chan].shift); } static int rpr0521_read_samp_freq(struct rpr0521_data *data, enum iio_chan_type chan_type, int *val, int *val2) { int reg, ret; ret = regmap_read(data->regmap, RPR0521_REG_MODE_CTRL, ®); if (ret < 0) return ret; reg &= RPR0521_MODE_MEAS_TIME_MASK; if (reg >= ARRAY_SIZE(rpr0521_samp_freq_i)) return -EINVAL; switch (chan_type) { case IIO_INTENSITY: *val = rpr0521_samp_freq_i[reg].als_hz; *val2 = rpr0521_samp_freq_i[reg].als_uhz; return 0; case IIO_PROXIMITY: *val = rpr0521_samp_freq_i[reg].pxs_hz; *val2 = rpr0521_samp_freq_i[reg].pxs_uhz; return 0; default: return -EINVAL; } } static int rpr0521_write_samp_freq_common(struct rpr0521_data *data, enum iio_chan_type chan_type, int val, int val2) { int i; /* * Ignore channel * both pxs and als are setup only to same freq because of simplicity */ switch (val) { case 0: i = 0; break; case 2: if (val2 != 500000) return -EINVAL; i = 11; break; case 10: i = 6; break; default: return -EINVAL; } return regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, RPR0521_MODE_MEAS_TIME_MASK, i); } static int rpr0521_read_ps_offset(struct rpr0521_data *data, int *offset) { int ret; __le16 buffer; ret = regmap_bulk_read(data->regmap, RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer)); if (ret < 0) { dev_err(&data->client->dev, "Failed to read PS OFFSET register\n"); return ret; } *offset = le16_to_cpu(buffer); return ret; } static int rpr0521_write_ps_offset(struct rpr0521_data *data, int offset) { int ret; __le16 buffer; buffer = cpu_to_le16(offset & 0x3ff); ret = regmap_raw_write(data->regmap, RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer)); if (ret < 0) { dev_err(&data->client->dev, "Failed to write PS OFFSET register\n"); return ret; } return ret; } static int rpr0521_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct rpr0521_data *data = iio_priv(indio_dev); int ret; int busy; u8 device_mask; __le16 raw_data; switch (mask) { case IIO_CHAN_INFO_RAW: if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY) return -EINVAL; busy = iio_device_claim_direct_mode(indio_dev); if (busy) return -EBUSY; device_mask = rpr0521_data_reg[chan->address].device_mask; mutex_lock(&data->lock); ret = rpr0521_set_power_state(data, true, device_mask); if (ret < 0) goto rpr0521_read_raw_out; ret = regmap_bulk_read(data->regmap, rpr0521_data_reg[chan->address].address, &raw_data, sizeof(raw_data)); if (ret < 0) { rpr0521_set_power_state(data, false, device_mask); goto rpr0521_read_raw_out; } ret = rpr0521_set_power_state(data, false, device_mask); rpr0521_read_raw_out: mutex_unlock(&data->lock); iio_device_release_direct_mode(indio_dev); if (ret < 0) return ret; *val = le16_to_cpu(raw_data); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: mutex_lock(&data->lock); ret = rpr0521_get_gain(data, chan->address, val, val2); mutex_unlock(&data->lock); if (ret < 0) return ret; return IIO_VAL_INT_PLUS_MICRO; case IIO_CHAN_INFO_SAMP_FREQ: mutex_lock(&data->lock); ret = rpr0521_read_samp_freq(data, chan->type, val, val2); mutex_unlock(&data->lock); if (ret < 0) return ret; return IIO_VAL_INT_PLUS_MICRO; case IIO_CHAN_INFO_OFFSET: mutex_lock(&data->lock); ret = rpr0521_read_ps_offset(data, val); mutex_unlock(&data->lock); if (ret < 0) return ret; return IIO_VAL_INT; default: return -EINVAL; } } static int rpr0521_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct rpr0521_data *data = iio_priv(indio_dev); int ret; switch (mask) { case IIO_CHAN_INFO_SCALE: mutex_lock(&data->lock); ret = rpr0521_set_gain(data, chan->address, val, val2); mutex_unlock(&data->lock); return ret; case IIO_CHAN_INFO_SAMP_FREQ: mutex_lock(&data->lock); ret = rpr0521_write_samp_freq_common(data, chan->type, val, val2); mutex_unlock(&data->lock); return ret; case IIO_CHAN_INFO_OFFSET: mutex_lock(&data->lock); ret = rpr0521_write_ps_offset(data, val); mutex_unlock(&data->lock); return ret; default: return -EINVAL; } } static const struct iio_info rpr0521_info = { .read_raw = rpr0521_read_raw, .write_raw = rpr0521_write_raw, .attrs = &rpr0521_attribute_group, }; static int rpr0521_init(struct rpr0521_data *data) { int ret; int id; ret = regmap_read(data->regmap, RPR0521_REG_ID, &id); if (ret < 0) { dev_err(&data->client->dev, "Failed to read REG_ID register\n"); return ret; } if (id != RPR0521_MANUFACT_ID) { dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n", id, RPR0521_MANUFACT_ID); return -ENODEV; } /* set default measurement time - 100 ms for both ALS and PS */ ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, RPR0521_MODE_MEAS_TIME_MASK, RPR0521_DEFAULT_MEAS_TIME); if (ret) { pr_err("regmap_update_bits returned %d\n", ret); return ret; } #ifndef CONFIG_PM ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); if (ret < 0) return ret; ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); if (ret < 0) return ret; #endif data->irq_timestamp = 0; return 0; } static int rpr0521_poweroff(struct rpr0521_data *data) { int ret; int tmp; ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, RPR0521_MODE_ALS_MASK | RPR0521_MODE_PXS_MASK, RPR0521_MODE_ALS_DISABLE | RPR0521_MODE_PXS_DISABLE); if (ret < 0) return ret; data->als_dev_en = false; data->pxs_dev_en = false; /* * Int pin keeps state after power off. Set pin to high impedance * mode to prevent power drain. */ ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &tmp); if (ret) { dev_err(&data->client->dev, "Failed to reset int pin.\n"); return ret; } return 0; } static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg) { switch (reg) { case RPR0521_REG_MODE_CTRL: case RPR0521_REG_ALS_CTRL: case RPR0521_REG_PXS_CTRL: return false; default: return true; } } static const struct regmap_config rpr0521_regmap_config = { .name = RPR0521_REGMAP_NAME, .reg_bits = 8, .val_bits = 8, .max_register = RPR0521_REG_ID, .cache_type = REGCACHE_RBTREE, .volatile_reg = rpr0521_is_volatile_reg, }; static int rpr0521_probe(struct i2c_client *client) { struct rpr0521_data *data; struct iio_dev *indio_dev; struct regmap *regmap; int ret; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (!indio_dev) return -ENOMEM; regmap = devm_regmap_init_i2c(client, &rpr0521_regmap_config); if (IS_ERR(regmap)) { dev_err(&client->dev, "regmap_init failed!\n"); return PTR_ERR(regmap); } data = iio_priv(indio_dev); i2c_set_clientdata(client, indio_dev); data->client = client; data->regmap = regmap; mutex_init(&data->lock); indio_dev->info = &rpr0521_info; indio_dev->name = RPR0521_DRV_NAME; indio_dev->channels = rpr0521_channels; indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels); indio_dev->modes = INDIO_DIRECT_MODE; ret = rpr0521_init(data); if (ret < 0) { dev_err(&client->dev, "rpr0521 chip init failed\n"); return ret; } ret = pm_runtime_set_active(&client->dev); if (ret < 0) goto err_poweroff; pm_runtime_enable(&client->dev); pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS); pm_runtime_use_autosuspend(&client->dev); /* * If sensor write/read is needed in _probe after _use_autosuspend, * sensor needs to be _resumed first using rpr0521_set_power_state(). */ /* IRQ to trigger setup */ if (client->irq) { /* Trigger0 producer setup */ data->drdy_trigger0 = devm_iio_trigger_alloc( indio_dev->dev.parent, "%s-dev%d", indio_dev->name, iio_device_id(indio_dev)); if (!data->drdy_trigger0) { ret = -ENOMEM; goto err_pm_disable; } data->drdy_trigger0->ops = &rpr0521_trigger_ops; indio_dev->available_scan_masks = rpr0521_available_scan_masks; iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev); /* Ties irq to trigger producer handler. */ ret = devm_request_threaded_irq(&client->dev, client->irq, rpr0521_drdy_irq_handler, rpr0521_drdy_irq_thread, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, RPR0521_IRQ_NAME, indio_dev); if (ret < 0) { dev_err(&client->dev, "request irq %d for trigger0 failed\n", client->irq); goto err_pm_disable; } ret = devm_iio_trigger_register(indio_dev->dev.parent, data->drdy_trigger0); if (ret) { dev_err(&client->dev, "iio trigger register failed\n"); goto err_pm_disable; } /* * Now whole pipe from physical interrupt (irq defined by * devicetree to device) to trigger0 output is set up. */ /* Trigger consumer setup */ ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent, indio_dev, iio_pollfunc_store_time, rpr0521_trigger_consumer_handler, &rpr0521_buffer_setup_ops); if (ret < 0) { dev_err(&client->dev, "iio triggered buffer setup failed\n"); goto err_pm_disable; } } ret = iio_device_register(indio_dev); if (ret) goto err_pm_disable; return 0; err_pm_disable: pm_runtime_disable(&client->dev); pm_runtime_set_suspended(&client->dev); err_poweroff: rpr0521_poweroff(data); return ret; } static void rpr0521_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); iio_device_unregister(indio_dev); pm_runtime_disable(&client->dev); pm_runtime_set_suspended(&client->dev); rpr0521_poweroff(iio_priv(indio_dev)); } static int rpr0521_runtime_suspend(struct device *dev) { struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); struct rpr0521_data *data = iio_priv(indio_dev); int ret; mutex_lock(&data->lock); /* If measurements are enabled, enable them on resume */ if (!data->als_need_dis) data->als_ps_need_en = data->als_dev_en; if (!data->pxs_need_dis) data->pxs_ps_need_en = data->pxs_dev_en; /* disable channels and sets {als,pxs}_dev_en to false */ ret = rpr0521_poweroff(data); regcache_mark_dirty(data->regmap); mutex_unlock(&data->lock); return ret; } static int rpr0521_runtime_resume(struct device *dev) { struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); struct rpr0521_data *data = iio_priv(indio_dev); int ret; regcache_sync(data->regmap); if (data->als_ps_need_en) { ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); if (ret < 0) return ret; data->als_ps_need_en = false; } if (data->pxs_ps_need_en) { ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); if (ret < 0) return ret; data->pxs_ps_need_en = false; } msleep(100); //wait for first measurement result return 0; } static const struct dev_pm_ops rpr0521_pm_ops = { RUNTIME_PM_OPS(rpr0521_runtime_suspend, rpr0521_runtime_resume, NULL) }; static const struct acpi_device_id rpr0521_acpi_match[] = { {"RPR0521", 0}, { } }; MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match); static const struct i2c_device_id rpr0521_id[] = { { "rpr0521" }, { } }; MODULE_DEVICE_TABLE(i2c, rpr0521_id); static struct i2c_driver rpr0521_driver = { .driver = { .name = RPR0521_DRV_NAME, .pm = pm_ptr(&rpr0521_pm_ops), .acpi_match_table = rpr0521_acpi_match, }, .probe = rpr0521_probe, .remove = rpr0521_remove, .id_table = rpr0521_id, }; module_i2c_driver(rpr0521_driver); MODULE_AUTHOR("Daniel Baluta "); MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver"); MODULE_LICENSE("GPL v2");