^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * STMicroelectronics hts221 sensor driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2016 STMicroelectronics Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Lorenzo Bianconi <lorenzo.bianconi@st.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/irqreturn.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/bitfield.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/iio/trigger.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/iio/events.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/iio/trigger_consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/iio/triggered_buffer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/iio/buffer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/platform_data/st_sensors_pdata.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include "hts221.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define HTS221_REG_DRDY_HL_ADDR 0x22
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define HTS221_REG_DRDY_HL_MASK BIT(7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define HTS221_REG_DRDY_PP_OD_ADDR 0x22
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define HTS221_REG_DRDY_PP_OD_MASK BIT(6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define HTS221_REG_DRDY_EN_ADDR 0x22
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define HTS221_REG_DRDY_EN_MASK BIT(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define HTS221_REG_STATUS_ADDR 0x27
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define HTS221_RH_DRDY_MASK BIT(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define HTS221_TEMP_DRDY_MASK BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static int hts221_trig_set_state(struct iio_trigger *trig, bool state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct iio_dev *iio_dev = iio_trigger_get_drvdata(trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct hts221_hw *hw = iio_priv(iio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return regmap_update_bits(hw->regmap, HTS221_REG_DRDY_EN_ADDR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) HTS221_REG_DRDY_EN_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) FIELD_PREP(HTS221_REG_DRDY_EN_MASK, state));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static const struct iio_trigger_ops hts221_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) .set_trigger_state = hts221_trig_set_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static irqreturn_t hts221_trigger_handler_thread(int irq, void *private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct hts221_hw *hw = private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) int err, status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) err = regmap_read(hw->regmap, HTS221_REG_STATUS_ADDR, &status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * H_DA bit (humidity data available) is routed to DRDY line.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * Humidity sample is computed after temperature one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * Here we can assume data channels are both available if H_DA bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * is set in status register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (!(status & HTS221_RH_DRDY_MASK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) iio_trigger_poll_chained(hw->trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int hts221_allocate_trigger(struct iio_dev *iio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct hts221_hw *hw = iio_priv(iio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct st_sensors_platform_data *pdata = dev_get_platdata(hw->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) bool irq_active_low = false, open_drain = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) unsigned long irq_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) irq_type = irqd_get_trigger_type(irq_get_irq_data(hw->irq));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) switch (irq_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) case IRQF_TRIGGER_HIGH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) case IRQF_TRIGGER_RISING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) case IRQF_TRIGGER_LOW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) case IRQF_TRIGGER_FALLING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) irq_active_low = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) dev_info(hw->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) "mode %lx unsupported, using IRQF_TRIGGER_RISING\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) irq_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) irq_type = IRQF_TRIGGER_RISING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) err = regmap_update_bits(hw->regmap, HTS221_REG_DRDY_HL_ADDR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) HTS221_REG_DRDY_HL_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) FIELD_PREP(HTS221_REG_DRDY_HL_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) irq_active_low));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (device_property_read_bool(hw->dev, "drive-open-drain") ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) (pdata && pdata->open_drain)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) irq_type |= IRQF_SHARED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) open_drain = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) err = regmap_update_bits(hw->regmap, HTS221_REG_DRDY_PP_OD_ADDR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) HTS221_REG_DRDY_PP_OD_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) FIELD_PREP(HTS221_REG_DRDY_PP_OD_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) open_drain));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) err = devm_request_threaded_irq(hw->dev, hw->irq, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) hts221_trigger_handler_thread,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) irq_type | IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) hw->name, hw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) dev_err(hw->dev, "failed to request trigger irq %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) hw->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) hw->trig = devm_iio_trigger_alloc(hw->dev, "%s-trigger",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) iio_dev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (!hw->trig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) iio_trigger_set_drvdata(hw->trig, iio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) hw->trig->ops = &hts221_trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) hw->trig->dev.parent = hw->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) iio_dev->trig = iio_trigger_get(hw->trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return devm_iio_trigger_register(hw->dev, hw->trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static int hts221_buffer_preenable(struct iio_dev *iio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return hts221_set_enable(iio_priv(iio_dev), true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) static int hts221_buffer_postdisable(struct iio_dev *iio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return hts221_set_enable(iio_priv(iio_dev), false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static const struct iio_buffer_setup_ops hts221_buffer_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) .preenable = hts221_buffer_preenable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) .postdisable = hts221_buffer_postdisable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static irqreturn_t hts221_buffer_handler_thread(int irq, void *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) struct iio_poll_func *pf = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) struct iio_dev *iio_dev = pf->indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) struct hts221_hw *hw = iio_priv(iio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct iio_chan_spec const *ch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /* humidity data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) ch = &iio_dev->channels[HTS221_SENSOR_H];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) err = regmap_bulk_read(hw->regmap, ch->address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) &hw->scan.channels[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) sizeof(hw->scan.channels[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* temperature data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) ch = &iio_dev->channels[HTS221_SENSOR_T];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) err = regmap_bulk_read(hw->regmap, ch->address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) &hw->scan.channels[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) sizeof(hw->scan.channels[1]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) iio_push_to_buffers_with_timestamp(iio_dev, &hw->scan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) iio_get_time_ns(iio_dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) iio_trigger_notify_done(hw->trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) int hts221_allocate_buffers(struct iio_dev *iio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct hts221_hw *hw = iio_priv(iio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return devm_iio_triggered_buffer_setup(hw->dev, iio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) NULL, hts221_buffer_handler_thread,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) &hts221_buffer_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) MODULE_DESCRIPTION("STMicroelectronics hts221 buffer driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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