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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 | /* * STMicroelectronics hts221 sensor driver * * Copyright 2016 STMicroelectronics Inc. * * Lorenzo Bianconi <lorenzo.bianconi@st.com> * * Licensed under the GPL-2. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/device.h> #include <linux/interrupt.h> #include <linux/irqreturn.h> #include <linux/iio/iio.h> #include <linux/iio/trigger.h> #include <linux/iio/events.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> #include <linux/iio/buffer.h> #include "hts221.h" #define HTS221_REG_STATUS_ADDR 0x27 #define HTS221_RH_DRDY_MASK BIT(1) #define HTS221_TEMP_DRDY_MASK BIT(0) static int hts221_trig_set_state(struct iio_trigger *trig, bool state) { struct iio_dev *iio_dev = iio_trigger_get_drvdata(trig); struct hts221_hw *hw = iio_priv(iio_dev); return hts221_config_drdy(hw, state); } static const struct iio_trigger_ops hts221_trigger_ops = { .owner = THIS_MODULE, .set_trigger_state = hts221_trig_set_state, }; static irqreturn_t hts221_trigger_handler_thread(int irq, void *private) { struct hts221_hw *hw = (struct hts221_hw *)private; u8 status; int err; err = hw->tf->read(hw->dev, HTS221_REG_STATUS_ADDR, sizeof(status), &status); if (err < 0) return IRQ_HANDLED; /* * H_DA bit (humidity data available) is routed to DRDY line. * Humidity sample is computed after temperature one. * Here we can assume data channels are both available if H_DA bit * is set in status register */ if (!(status & HTS221_RH_DRDY_MASK)) return IRQ_NONE; iio_trigger_poll_chained(hw->trig); return IRQ_HANDLED; } int hts221_allocate_trigger(struct hts221_hw *hw) { struct iio_dev *iio_dev = iio_priv_to_dev(hw); unsigned long irq_type; int err; irq_type = irqd_get_trigger_type(irq_get_irq_data(hw->irq)); switch (irq_type) { case IRQF_TRIGGER_HIGH: case IRQF_TRIGGER_RISING: break; default: dev_info(hw->dev, "mode %lx unsupported, using IRQF_TRIGGER_RISING\n", irq_type); irq_type = IRQF_TRIGGER_RISING; break; } err = devm_request_threaded_irq(hw->dev, hw->irq, NULL, hts221_trigger_handler_thread, irq_type | IRQF_ONESHOT, hw->name, hw); if (err) { dev_err(hw->dev, "failed to request trigger irq %d\n", hw->irq); return err; } hw->trig = devm_iio_trigger_alloc(hw->dev, "%s-trigger", iio_dev->name); if (!hw->trig) return -ENOMEM; iio_trigger_set_drvdata(hw->trig, iio_dev); hw->trig->ops = &hts221_trigger_ops; hw->trig->dev.parent = hw->dev; iio_dev->trig = iio_trigger_get(hw->trig); return devm_iio_trigger_register(hw->dev, hw->trig); } static int hts221_buffer_preenable(struct iio_dev *iio_dev) { return hts221_power_on(iio_priv(iio_dev)); } static int hts221_buffer_postdisable(struct iio_dev *iio_dev) { return hts221_power_off(iio_priv(iio_dev)); } static const struct iio_buffer_setup_ops hts221_buffer_ops = { .preenable = hts221_buffer_preenable, .postenable = iio_triggered_buffer_postenable, .predisable = iio_triggered_buffer_predisable, .postdisable = hts221_buffer_postdisable, }; static irqreturn_t hts221_buffer_handler_thread(int irq, void *p) { u8 buffer[ALIGN(2 * HTS221_DATA_SIZE, sizeof(s64)) + sizeof(s64)]; struct iio_poll_func *pf = p; struct iio_dev *iio_dev = pf->indio_dev; struct hts221_hw *hw = iio_priv(iio_dev); struct iio_chan_spec const *ch; int err; /* humidity data */ ch = &iio_dev->channels[HTS221_SENSOR_H]; err = hw->tf->read(hw->dev, ch->address, HTS221_DATA_SIZE, buffer); if (err < 0) goto out; /* temperature data */ ch = &iio_dev->channels[HTS221_SENSOR_T]; err = hw->tf->read(hw->dev, ch->address, HTS221_DATA_SIZE, buffer + HTS221_DATA_SIZE); if (err < 0) goto out; iio_push_to_buffers_with_timestamp(iio_dev, buffer, iio_get_time_ns(iio_dev)); out: iio_trigger_notify_done(hw->trig); return IRQ_HANDLED; } int hts221_allocate_buffers(struct hts221_hw *hw) { return devm_iio_triggered_buffer_setup(hw->dev, iio_priv_to_dev(hw), NULL, hts221_buffer_handler_thread, &hts221_buffer_ops); } MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>"); MODULE_DESCRIPTION("STMicroelectronics hts221 buffer driver"); MODULE_LICENSE("GPL v2"); |