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| author | Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> | 2017-07-17 19:39:03 +0200 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2017-07-25 20:00:47 +0100 |
| commit | 9251f7aaa53c0315c45ee000461002f971f01ea0 (patch) | |
| tree | 4ce96c6d5000f474c0814e7515cd6daa987adc4e /drivers/iio/humidity/hts221_buffer.c | |
| parent | 8614206a054a2b53237d5d5c47f8669477cf267f (diff) | |
| download | lwn-9251f7aaa53c0315c45ee000461002f971f01ea0.tar.gz lwn-9251f7aaa53c0315c45ee000461002f971f01ea0.zip | |
iio: humidity: hts221: support open drain mode
Add open drain support in order to share requested IRQ line between
hts221 device and other peripherals
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/humidity/hts221_buffer.c')
| -rw-r--r-- | drivers/iio/humidity/hts221_buffer.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/iio/humidity/hts221_buffer.c b/drivers/iio/humidity/hts221_buffer.c index ad5222295b2c..f29f01a22375 100644 --- a/drivers/iio/humidity/hts221_buffer.c +++ b/drivers/iio/humidity/hts221_buffer.c @@ -20,10 +20,14 @@ #include <linux/iio/triggered_buffer.h> #include <linux/iio/buffer.h> +#include <linux/platform_data/st_sensors_pdata.h> + #include "hts221.h" #define HTS221_REG_DRDY_HL_ADDR 0x22 #define HTS221_REG_DRDY_HL_MASK BIT(7) +#define HTS221_REG_DRDY_PP_OD_ADDR 0x22 +#define HTS221_REG_DRDY_PP_OD_MASK BIT(6) #define HTS221_REG_STATUS_ADDR 0x27 #define HTS221_RH_DRDY_MASK BIT(1) #define HTS221_TEMP_DRDY_MASK BIT(0) @@ -69,7 +73,9 @@ static irqreturn_t hts221_trigger_handler_thread(int irq, void *private) int hts221_allocate_trigger(struct hts221_hw *hw) { struct iio_dev *iio_dev = iio_priv_to_dev(hw); - bool irq_active_low = false; + bool irq_active_low = false, open_drain = false; + struct device_node *np = hw->dev->of_node; + struct st_sensors_platform_data *pdata; unsigned long irq_type; int err; @@ -95,6 +101,20 @@ int hts221_allocate_trigger(struct hts221_hw *hw) HTS221_REG_DRDY_HL_MASK, irq_active_low); if (err < 0) return err; + + pdata = (struct st_sensors_platform_data *)hw->dev->platform_data; + if ((np && of_property_read_bool(np, "drive-open-drain")) || + (pdata && pdata->open_drain)) { + irq_type |= IRQF_SHARED; + open_drain = true; + } + + err = hts221_write_with_mask(hw, HTS221_REG_DRDY_PP_OD_ADDR, + HTS221_REG_DRDY_PP_OD_MASK, + open_drain); + if (err < 0) + return err; + err = devm_request_threaded_irq(hw->dev, hw->irq, NULL, hts221_trigger_handler_thread, irq_type | IRQF_ONESHOT, |