diff options
Diffstat (limited to 'drivers/iio/light/rpr0521.c')
| -rw-r--r-- | drivers/iio/light/rpr0521.c | 336 |
1 files changed, 329 insertions, 7 deletions
diff --git a/drivers/iio/light/rpr0521.c b/drivers/iio/light/rpr0521.c index 9d0c2e859bb2..a6efa12613a2 100644 --- a/drivers/iio/light/rpr0521.c +++ b/drivers/iio/light/rpr0521.c @@ -9,7 +9,7 @@ * * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38). * - * TODO: illuminance channel, buffer + * TODO: illuminance channel */ #include <linux/module.h> @@ -20,6 +20,10 @@ #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> @@ -30,6 +34,7 @@ #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 @@ -42,16 +47,31 @@ #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 @@ -167,6 +187,9 @@ struct rpr0521_data { 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; @@ -196,6 +219,19 @@ 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, @@ -204,6 +240,13 @@ static const struct iio_chan_spec rpr0521_channels[] = { 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, @@ -213,6 +256,13 @@ static const struct iio_chan_spec rpr0521_channels[] = { .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, @@ -222,6 +272,13 @@ static const struct iio_chan_spec rpr0521_channels[] = { .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, + }, }, }; @@ -330,6 +387,198 @@ static int rpr0521_set_power_state(struct rpr0521_data *data, bool on, 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; + + u8 buffer[16]; /* 3 16-bit channels + padding + ts */ + + /* 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, + &buffer, + (3 * 2) + 1); /* 3 * 16-bit + (discarded) int clear reg. */ + if (!err) + iio_push_to_buffers_with_timestamp(indio_dev, + buffer, 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, + .owner = THIS_MODULE, + }; + + +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) { @@ -473,6 +722,7 @@ static int rpr0521_read_raw(struct iio_dev *indio_dev, { struct rpr0521_data *data = iio_priv(indio_dev); int ret; + int busy; u8 device_mask; __le16 raw_data; @@ -481,26 +731,30 @@ static int rpr0521_read_raw(struct iio_dev *indio_dev, 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) { - mutex_unlock(&data->lock); - return ret; - } + 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); - mutex_unlock(&data->lock); - return ret; + 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; @@ -617,12 +871,15 @@ static int rpr0521_init(struct rpr0521_data *data) 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 | @@ -635,6 +892,16 @@ static int rpr0521_poweroff(struct rpr0521_data *data) 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; } @@ -707,6 +974,61 @@ static int rpr0521_probe(struct i2c_client *client, 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; |