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iio:temperature:tmp007: Add irq and threshold events support
This patch adds ALERT irq and limit threshold events support for TI TMP007 - 16 bit IR thermopile sensor with integrated math engine. Following threshold events are supported: 1. TObj high limit 2. TObj low limit 3. TDie high limit 4. TDie low limit Signed-off-by: Manivannan Sadhasivam <manivannanece23@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
parent
b3c590ce14
commit
7c5bc7e87c
1 changed files with 265 additions and 12 deletions
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@ -11,9 +11,10 @@
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*
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* (7-bit I2C slave address (0x40 - 0x47), changeable via ADR pins)
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*
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* Note: This driver assumes that the sensor has been calibrated beforehand
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*
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* TODO: ALERT irq, limit threshold events
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* Note:
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* 1. This driver assumes that the sensor has been calibrated beforehand
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* 2. Limit threshold events are enabled at the start
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* 3. Operating mode: INT
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*
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*/
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@ -24,25 +25,38 @@
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#include <linux/pm.h>
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#include <linux/bitops.h>
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#include <linux/of.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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#define TMP007_TDIE 0x01
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#define TMP007_CONFIG 0x02
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#define TMP007_TOBJECT 0x03
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#define TMP007_STATUS 0x04
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#define TMP007_STATUS_MASK 0x05
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#define TMP007_TOBJ_HIGH_LIMIT 0x06
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#define TMP007_TOBJ_LOW_LIMIT 0x07
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#define TMP007_TDIE_HIGH_LIMIT 0x08
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#define TMP007_TDIE_LOW_LIMIT 0x09
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#define TMP007_MANUFACTURER_ID 0x1e
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#define TMP007_DEVICE_ID 0x1f
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#define TMP007_CONFIG_CONV_EN BIT(12)
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#define TMP007_CONFIG_COMP_EN BIT(5)
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#define TMP007_CONFIG_TC_EN BIT(6)
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#define TMP007_CONFIG_CR_MASK GENMASK(11, 9)
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#define TMP007_CONFIG_ALERT_EN BIT(8)
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#define TMP007_CONFIG_CR_SHIFT 9
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/* Status register flags */
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#define TMP007_STATUS_ALERT BIT(15)
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#define TMP007_STATUS_CONV_READY BIT(14)
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#define TMP007_STATUS_OHF BIT(13)
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#define TMP007_STATUS_OLF BIT(12)
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#define TMP007_STATUS_LHF BIT(11)
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#define TMP007_STATUS_LLF BIT(10)
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#define TMP007_STATUS_DATA_VALID BIT(9)
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#define TMP007_MANUFACTURER_MAGIC 0x5449
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@ -52,7 +66,9 @@
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struct tmp007_data {
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struct i2c_client *client;
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struct mutex lock;
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u16 config;
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u16 status_mask;
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};
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static const int tmp007_avgs[5][2] = { {4, 0}, {2, 0}, {1, 0},
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@ -156,6 +172,188 @@ static int tmp007_write_raw(struct iio_dev *indio_dev,
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return -EINVAL;
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}
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static irqreturn_t tmp007_interrupt_handler(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct tmp007_data *data = iio_priv(indio_dev);
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int ret;
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ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS);
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if ((ret < 0) || !(ret & (TMP007_STATUS_OHF | TMP007_STATUS_OLF |
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TMP007_STATUS_LHF | TMP007_STATUS_LLF)))
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return IRQ_NONE;
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if (ret & TMP007_STATUS_OHF)
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iio_push_event(indio_dev,
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IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
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IIO_MOD_TEMP_OBJECT,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_RISING),
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iio_get_time_ns(indio_dev));
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if (ret & TMP007_STATUS_OLF)
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iio_push_event(indio_dev,
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IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
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IIO_MOD_TEMP_OBJECT,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_FALLING),
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iio_get_time_ns(indio_dev));
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if (ret & TMP007_STATUS_LHF)
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iio_push_event(indio_dev,
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IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
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IIO_MOD_TEMP_AMBIENT,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_RISING),
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iio_get_time_ns(indio_dev));
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if (ret & TMP007_STATUS_LLF)
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iio_push_event(indio_dev,
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IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
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IIO_MOD_TEMP_AMBIENT,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_FALLING),
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iio_get_time_ns(indio_dev));
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return IRQ_HANDLED;
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}
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static int tmp007_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 tmp007_data *data = iio_priv(indio_dev);
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unsigned int status_mask;
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int ret;
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switch (chan->channel2) {
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case IIO_MOD_TEMP_AMBIENT:
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if (dir == IIO_EV_DIR_RISING)
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status_mask = TMP007_STATUS_LHF;
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else
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status_mask = TMP007_STATUS_LLF;
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break;
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case IIO_MOD_TEMP_OBJECT:
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if (dir == IIO_EV_DIR_RISING)
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status_mask = TMP007_STATUS_OHF;
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else
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status_mask = TMP007_STATUS_OLF;
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break;
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default:
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return -EINVAL;
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}
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mutex_lock(&data->lock);
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ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK);
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mutex_unlock(&data->lock);
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if (ret < 0)
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return ret;
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if (state)
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ret |= status_mask;
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else
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ret &= ~status_mask;
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return i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK,
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data->status_mask = ret);
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}
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static int tmp007_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 tmp007_data *data = iio_priv(indio_dev);
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unsigned int mask;
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switch (chan->channel2) {
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case IIO_MOD_TEMP_AMBIENT:
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if (dir == IIO_EV_DIR_RISING)
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mask = TMP007_STATUS_LHF;
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else
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mask = TMP007_STATUS_LLF;
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break;
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case IIO_MOD_TEMP_OBJECT:
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if (dir == IIO_EV_DIR_RISING)
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mask = TMP007_STATUS_OHF;
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else
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mask = TMP007_STATUS_OLF;
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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 !!(data->status_mask & mask);
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}
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static int tmp007_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,
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int *val, int *val2)
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{
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struct tmp007_data *data = iio_priv(indio_dev);
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int ret;
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u8 reg;
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switch (chan->channel2) {
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case IIO_MOD_TEMP_AMBIENT: /* LSB: 0.5 degree Celsius */
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if (dir == IIO_EV_DIR_RISING)
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reg = TMP007_TDIE_HIGH_LIMIT;
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else
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reg = TMP007_TDIE_LOW_LIMIT;
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break;
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case IIO_MOD_TEMP_OBJECT:
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if (dir == IIO_EV_DIR_RISING)
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reg = TMP007_TOBJ_HIGH_LIMIT;
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else
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reg = TMP007_TOBJ_LOW_LIMIT;
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break;
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default:
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return -EINVAL;
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}
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ret = i2c_smbus_read_word_swapped(data->client, reg);
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if (ret < 0)
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return ret;
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/* Shift length 7 bits = 6(15:6) + 1(0.5 LSB) */
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*val = sign_extend32(ret, 15) >> 7;
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return IIO_VAL_INT;
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}
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static int tmp007_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,
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int val, int val2)
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{
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struct tmp007_data *data = iio_priv(indio_dev);
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u8 reg;
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switch (chan->channel2) {
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case IIO_MOD_TEMP_AMBIENT:
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if (dir == IIO_EV_DIR_RISING)
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reg = TMP007_TDIE_HIGH_LIMIT;
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else
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reg = TMP007_TDIE_LOW_LIMIT;
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break;
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case IIO_MOD_TEMP_OBJECT:
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if (dir == IIO_EV_DIR_RISING)
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reg = TMP007_TOBJ_HIGH_LIMIT;
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else
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reg = TMP007_TOBJ_LOW_LIMIT;
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break;
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default:
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return -EINVAL;
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}
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/* Full scale threshold value is +/- 256 degree Celsius */
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if (val < -256 || val > 255)
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return -EINVAL;
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/* Shift length 7 bits = 6(15:6) + 1(0.5 LSB) */
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return i2c_smbus_write_word_swapped(data->client, reg, (val << 7));
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}
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static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");
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static struct attribute *tmp007_attributes[] = {
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.attrs = tmp007_attributes,
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};
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static const struct iio_event_spec tmp007_obj_event[] = {
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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_event_spec tmp007_die_event[] = {
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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 tmp007_channels[] = {
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{
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.type = IIO_TEMP,
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@ -175,6 +403,8 @@ static const struct iio_chan_spec tmp007_channels[] = {
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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.event_spec = tmp007_die_event,
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.num_event_specs = ARRAY_SIZE(tmp007_die_event),
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},
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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.event_spec = tmp007_obj_event,
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.num_event_specs = ARRAY_SIZE(tmp007_obj_event),
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}
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};
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static const struct iio_info tmp007_info = {
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.read_raw = tmp007_read_raw,
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.write_raw = tmp007_write_raw,
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.read_event_config = tmp007_read_event_config,
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.write_event_config = tmp007_write_event_config,
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.read_event_value = tmp007_read_thresh,
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.write_event_value = tmp007_write_thresh,
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.attrs = &tmp007_attribute_group,
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.driver_module = THIS_MODULE,
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};
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@ -214,7 +450,6 @@ static int tmp007_probe(struct i2c_client *client,
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struct tmp007_data *data;
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struct iio_dev *indio_dev;
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int ret;
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u16 status;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
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return -EOPNOTSUPP;
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@ -231,6 +466,7 @@ static int tmp007_probe(struct i2c_client *client,
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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mutex_init(&data->lock);
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indio_dev->dev.parent = &client->dev;
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indio_dev->name = "tmp007";
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@ -243,7 +479,7 @@ static int tmp007_probe(struct i2c_client *client,
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/*
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* Set Configuration register:
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* 1. Conversion ON
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* 2. Comparator mode
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* 2. ALERT enable
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* 3. Transient correction enable
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*/
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@ -252,7 +488,7 @@ static int tmp007_probe(struct i2c_client *client,
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return ret;
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data->config = ret;
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data->config |= (TMP007_CONFIG_CONV_EN | TMP007_CONFIG_COMP_EN | TMP007_CONFIG_TC_EN);
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data->config |= (TMP007_CONFIG_CONV_EN | TMP007_CONFIG_ALERT_EN | TMP007_CONFIG_TC_EN);
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ret = i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
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data->config);
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@ -260,22 +496,39 @@ static int tmp007_probe(struct i2c_client *client,
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return ret;
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/*
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* Only the following flags can activate ALERT pin. Data conversion/validity flags
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* flags can still be polled for getting temperature data
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*
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* Set Status Mask register:
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* 1. Conversion ready enable
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* 2. Data valid enable
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* 1. Object temperature high limit enable
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* 2. Object temperature low limit enable
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* 3. TDIE temperature high limit enable
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* 4. TDIE temperature low limit enable
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*/
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ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK);
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if (ret < 0)
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goto error_powerdown;
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status = ret;
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status |= (TMP007_STATUS_CONV_READY | TMP007_STATUS_DATA_VALID);
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data->status_mask = ret;
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data->status_mask |= (TMP007_STATUS_OHF | TMP007_STATUS_OLF
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| TMP007_STATUS_LHF | TMP007_STATUS_LLF);
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ret = i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK, status);
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ret = i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK, data->status_mask);
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if (ret < 0)
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goto error_powerdown;
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if (client->irq) {
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ret = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, tmp007_interrupt_handler,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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tmp007_id->name, indio_dev);
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if (ret) {
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dev_err(&client->dev, "irq request error %d\n", -ret);
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goto error_powerdown;
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}
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}
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return iio_device_register(indio_dev);
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error_powerdown:
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