iio: light: us5182d: Add interrupt support and events
Add interrupt support for proximity. Add two threshold events to signal rising and falling directions. Signed-off-by: Adriana Reus <adriana.reus@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Adriana Reus
Jonathan Cameron
parent
58e9042f5f
commit
b6695254f8
@ -20,7 +20,10 @@
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/iio/events.h>
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#include <linux/iio/iio.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/iio/sysfs.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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@ -30,6 +33,8 @@
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#define US5182D_CFG0_ONESHOT_EN BIT(6)
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#define US5182D_CFG0_SHUTDOWN_EN BIT(7)
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#define US5182D_CFG0_WORD_ENABLE BIT(0)
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#define US5182D_CFG0_PROX BIT(3)
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#define US5182D_CFG0_PX_IRQ BIT(2)
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#define US5182D_REG_CFG1 0x01
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#define US5182D_CFG1_ALS_RES16 BIT(4)
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@ -41,6 +46,7 @@
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#define US5182D_REG_CFG3 0x03
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#define US5182D_CFG3_LED_CURRENT100 (BIT(4) | BIT(5))
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#define US5182D_CFG3_INT_SOURCE_PX BIT(3)
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#define US5182D_REG_CFG4 0x10
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@ -55,6 +61,13 @@
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#define US5182D_REG_AUTO_LDARK_GAIN 0x29
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#define US5182D_REG_AUTO_HDARK_GAIN 0x2a
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/* Thresholds for events: px low (0x08-l, 0x09-h), px high (0x0a-l 0x0b-h) */
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#define US5182D_REG_PXL_TH 0x08
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#define US5182D_REG_PXH_TH 0x0a
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#define US5182D_REG_PXL_TH_DEFAULT 1000
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#define US5182D_REG_PXH_TH_DEFAULT 30000
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#define US5182D_OPMODE_ALS 0x01
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#define US5182D_OPMODE_PX 0x02
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#define US5182D_OPMODE_SHIFT 4
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@ -84,6 +97,8 @@
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#define US5182D_READ_WORD 2
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#define US5182D_OPSTORE_SLEEP_TIME 20 /* ms */
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#define US5182D_SLEEP_MS 3000 /* ms */
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#define US5182D_PXH_TH_DISABLE 0xffff
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#define US5182D_PXL_TH_DISABLE 0x0000
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/* Available ranges: [12354, 7065, 3998, 2202, 1285, 498, 256, 138] lux */
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static const int us5182d_scales[] = {188500, 107800, 61000, 33600, 19600, 7600,
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@ -119,6 +134,12 @@ struct us5182d_data {
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u8 upper_dark_gain;
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u16 *us5182d_dark_ths;
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u16 px_low_th;
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u16 px_high_th;
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int rising_en;
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int falling_en;
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u8 opmode;
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u8 power_mode;
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@ -148,10 +169,26 @@ static const struct {
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{US5182D_REG_CFG1, US5182D_CFG1_ALS_RES16},
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{US5182D_REG_CFG2, (US5182D_CFG2_PX_RES16 |
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US5182D_CFG2_PXGAIN_DEFAULT)},
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{US5182D_REG_CFG3, US5182D_CFG3_LED_CURRENT100},
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{US5182D_REG_CFG3, US5182D_CFG3_LED_CURRENT100 |
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US5182D_CFG3_INT_SOURCE_PX},
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{US5182D_REG_CFG4, 0x00},
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};
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static const struct iio_event_spec us5182d_events[] = {
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_RISING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE) |
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BIT(IIO_EV_INFO_ENABLE),
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},
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_FALLING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE) |
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BIT(IIO_EV_INFO_ENABLE),
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},
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};
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static const struct iio_chan_spec us5182d_channels[] = {
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{
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.type = IIO_LIGHT,
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@ -161,6 +198,8 @@ static const struct iio_chan_spec us5182d_channels[] = {
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{
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.type = IIO_PROXIMITY,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.event_spec = us5182d_events,
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.num_event_specs = ARRAY_SIZE(us5182d_events),
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}
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};
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@ -487,11 +526,201 @@ static int us5182d_write_raw(struct iio_dev *indio_dev,
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return -EINVAL;
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}
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static int us5182d_setup_prox(struct iio_dev *indio_dev,
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enum iio_event_direction dir, u16 val)
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{
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struct us5182d_data *data = iio_priv(indio_dev);
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if (dir == IIO_EV_DIR_FALLING)
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return i2c_smbus_write_word_data(data->client,
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US5182D_REG_PXL_TH, val);
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else if (dir == IIO_EV_DIR_RISING)
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return i2c_smbus_write_word_data(data->client,
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US5182D_REG_PXH_TH, val);
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return 0;
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}
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static int us5182d_read_thresh(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, enum iio_event_type type,
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enum iio_event_direction dir, enum iio_event_info info, int *val,
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int *val2)
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{
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struct us5182d_data *data = iio_priv(indio_dev);
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switch (dir) {
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case IIO_EV_DIR_RISING:
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mutex_lock(&data->lock);
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*val = data->px_high_th;
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mutex_unlock(&data->lock);
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break;
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case IIO_EV_DIR_FALLING:
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mutex_lock(&data->lock);
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*val = data->px_low_th;
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mutex_unlock(&data->lock);
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break;
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default:
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return -EINVAL;
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}
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return IIO_VAL_INT;
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}
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static int us5182d_write_thresh(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, enum iio_event_type type,
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enum iio_event_direction dir, enum iio_event_info info, int val,
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int val2)
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{
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struct us5182d_data *data = iio_priv(indio_dev);
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int ret;
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if (val < 0 || val > USHRT_MAX || val2 != 0)
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return -EINVAL;
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switch (dir) {
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case IIO_EV_DIR_RISING:
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mutex_lock(&data->lock);
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if (data->rising_en) {
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ret = us5182d_setup_prox(indio_dev, dir, val);
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if (ret < 0)
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goto err;
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}
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data->px_high_th = val;
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mutex_unlock(&data->lock);
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break;
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case IIO_EV_DIR_FALLING:
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mutex_lock(&data->lock);
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if (data->falling_en) {
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ret = us5182d_setup_prox(indio_dev, dir, val);
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if (ret < 0)
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goto err;
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}
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data->px_low_th = val;
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mutex_unlock(&data->lock);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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err:
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mutex_unlock(&data->lock);
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return ret;
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}
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static int us5182d_read_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, enum iio_event_type type,
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enum iio_event_direction dir)
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{
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struct us5182d_data *data = iio_priv(indio_dev);
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int ret;
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switch (dir) {
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case IIO_EV_DIR_RISING:
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mutex_lock(&data->lock);
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ret = data->rising_en;
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mutex_unlock(&data->lock);
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break;
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case IIO_EV_DIR_FALLING:
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mutex_lock(&data->lock);
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ret = data->falling_en;
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mutex_unlock(&data->lock);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static int us5182d_write_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, enum iio_event_type type,
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enum iio_event_direction dir, int state)
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{
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struct us5182d_data *data = iio_priv(indio_dev);
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int ret;
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u16 new_th;
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mutex_lock(&data->lock);
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switch (dir) {
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case IIO_EV_DIR_RISING:
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if (data->rising_en == state) {
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mutex_unlock(&data->lock);
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return 0;
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}
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new_th = US5182D_PXH_TH_DISABLE;
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if (state) {
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data->power_mode = US5182D_CONTINUOUS;
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ret = us5182d_set_power_state(data, true);
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if (ret < 0)
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goto err;
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ret = us5182d_px_enable(data);
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if (ret < 0)
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goto err_poweroff;
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new_th = data->px_high_th;
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}
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ret = us5182d_setup_prox(indio_dev, dir, new_th);
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if (ret < 0)
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goto err_poweroff;
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data->rising_en = state;
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break;
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case IIO_EV_DIR_FALLING:
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if (data->falling_en == state) {
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mutex_unlock(&data->lock);
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return 0;
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}
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new_th = US5182D_PXL_TH_DISABLE;
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if (state) {
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data->power_mode = US5182D_CONTINUOUS;
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ret = us5182d_set_power_state(data, true);
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if (ret < 0)
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goto err;
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ret = us5182d_px_enable(data);
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if (ret < 0)
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goto err_poweroff;
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new_th = data->px_low_th;
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}
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ret = us5182d_setup_prox(indio_dev, dir, new_th);
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if (ret < 0)
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goto err_poweroff;
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data->falling_en = state;
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break;
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default:
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ret = -EINVAL;
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goto err;
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}
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if (!state) {
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ret = us5182d_set_power_state(data, false);
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if (ret < 0)
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goto err;
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}
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if (!data->falling_en && !data->rising_en && !data->default_continuous)
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data->power_mode = US5182D_ONESHOT;
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mutex_unlock(&data->lock);
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return 0;
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err_poweroff:
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if (state)
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us5182d_set_power_state(data, false);
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err:
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mutex_unlock(&data->lock);
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return ret;
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}
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static const struct iio_info us5182d_info = {
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.driver_module = THIS_MODULE,
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.read_raw = us5182d_read_raw,
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.write_raw = us5182d_write_raw,
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.attrs = &us5182d_attr_group,
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.read_event_value = &us5182d_read_thresh,
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.write_event_value = &us5182d_write_thresh,
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.read_event_config = &us5182d_read_event_config,
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.write_event_config = &us5182d_write_event_config,
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};
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static int us5182d_reset(struct iio_dev *indio_dev)
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@ -513,6 +742,9 @@ static int us5182d_init(struct iio_dev *indio_dev)
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data->opmode = 0;
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data->power_mode = US5182D_CONTINUOUS;
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data->px_low_th = US5182D_REG_PXL_TH_DEFAULT;
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data->px_high_th = US5182D_REG_PXH_TH_DEFAULT;
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for (i = 0; i < ARRAY_SIZE(us5182d_regvals); i++) {
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ret = i2c_smbus_write_byte_data(data->client,
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us5182d_regvals[i].reg,
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@ -583,6 +815,33 @@ static int us5182d_dark_gain_config(struct iio_dev *indio_dev)
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US5182D_REG_DARK_AUTO_EN_DEFAULT);
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}
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static irqreturn_t us5182d_irq_thread_handler(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct us5182d_data *data = iio_priv(indio_dev);
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enum iio_event_direction dir;
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int ret;
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u64 ev;
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ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
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if (ret < 0) {
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dev_err(&data->client->dev, "i2c transfer error in irq\n");
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return IRQ_HANDLED;
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}
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dir = ret & US5182D_CFG0_PROX ? IIO_EV_DIR_RISING : IIO_EV_DIR_FALLING;
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ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1, IIO_EV_TYPE_THRESH, dir);
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iio_push_event(indio_dev, ev, iio_get_time_ns());
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ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0,
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ret & ~US5182D_CFG0_PX_IRQ);
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if (ret < 0)
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dev_err(&data->client->dev, "i2c transfer error in irq\n");
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return IRQ_HANDLED;
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}
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static int us5182d_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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@ -614,6 +873,16 @@ static int us5182d_probe(struct i2c_client *client,
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return (ret < 0) ? ret : -ENODEV;
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}
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if (client->irq > 0) {
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ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
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us5182d_irq_thread_handler,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"us5182d-irq", indio_dev);
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if (ret < 0)
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return ret;
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} else
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dev_warn(&client->dev, "no valid irq found\n");
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us5182d_get_platform_data(indio_dev);
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ret = us5182d_init(indio_dev);
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if (ret < 0)
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