diff options
Diffstat (limited to 'drivers/iio/light/rpr0521.c')
| -rw-r--r-- | drivers/iio/light/rpr0521.c | 1151 |
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, ®); + 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"); |