| // 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 <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/i2c.h> |
| #include <linux/regmap.h> |
| #include <linux/delay.h> |
| #include <linux/acpi.h> |
| |
| #include <linux/iio/iio.h> |
| #include <linux/iio/buffer.h> |
| #include <linux/iio/trigger.h> |
| #include <linux/iio/trigger_consumer.h> |
| #include <linux/iio/triggered_buffer.h> |
| #include <linux/iio/sysfs.h> |
| #include <linux/pm_runtime.h> |
| |
| #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_get_sync(&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); |
| if (on) |
| pm_runtime_put_noidle(&data->client->dev); |
| |
| 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_chained(data->drdy_trigger0); |
| return IRQ_HANDLED; |
| } |
| |
| return IRQ_NONE; |
| } |
| |
| static irqreturn_t rpr0521_trigger_consumer_store_time(int irq, void *p) |
| { |
| struct iio_poll_func *pf = p; |
| struct iio_dev *indio_dev = pf->indio_dev; |
| |
| /* Other trigger polls store time here. */ |
| if (!iio_trigger_using_own(indio_dev)) |
| pf->timestamp = iio_get_time_ns(indio_dev); |
| |
| return IRQ_WAKE_THREAD; |
| } |
| |
| 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, |
| .postenable = iio_triggered_buffer_postenable, |
| .predisable = iio_triggered_buffer_predisable, |
| .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, |
| const struct i2c_device_id *id) |
| { |
| 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->dev.parent = &client->dev; |
| 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, indio_dev->id); |
| if (!data->drdy_trigger0) { |
| ret = -ENOMEM; |
| goto err_pm_disable; |
| } |
| data->drdy_trigger0->dev.parent = indio_dev->dev.parent; |
| 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, |
| rpr0521_trigger_consumer_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); |
| pm_runtime_put_noidle(&client->dev); |
| err_poweroff: |
| rpr0521_poweroff(data); |
| |
| return ret; |
| } |
| |
| static int 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); |
| pm_runtime_put_noidle(&client->dev); |
| |
| rpr0521_poweroff(iio_priv(indio_dev)); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| 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; |
| } |
| #endif |
| |
| static const struct dev_pm_ops rpr0521_pm_ops = { |
| SET_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", 0}, |
| { } |
| }; |
| |
| MODULE_DEVICE_TABLE(i2c, rpr0521_id); |
| |
| static struct i2c_driver rpr0521_driver = { |
| .driver = { |
| .name = RPR0521_DRV_NAME, |
| .pm = &rpr0521_pm_ops, |
| .acpi_match_table = ACPI_PTR(rpr0521_acpi_match), |
| }, |
| .probe = rpr0521_probe, |
| .remove = rpr0521_remove, |
| .id_table = rpr0521_id, |
| }; |
| |
| module_i2c_driver(rpr0521_driver); |
| |
| MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>"); |
| MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver"); |
| MODULE_LICENSE("GPL v2"); |