summaryrefslogtreecommitdiffstats
path: root/drivers/iio/light/rpr0521.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--drivers/iio/light/rpr0521.c1151
1 files changed, 1151 insertions, 0 deletions
diff --git a/drivers/iio/light/rpr0521.c b/drivers/iio/light/rpr0521.c
new file mode 100644
index 000000000..d61c06452
--- /dev/null
+++ b/drivers/iio/light/rpr0521.c
@@ -0,0 +1,1151 @@
+/*
+ * RPR-0521 ROHM Ambient Light and Proximity Sensor
+ *
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * This file is subject to the terms and conditions of version 2 of
+ * the GNU General Public License. See the file COPYING in the main
+ * directory of this archive for more details.
+ *
+ * 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, &reg);
+ 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, &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, &reg);
+ 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");