--- /dev/null
+/*
+ * 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/interrupt.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");
--- /dev/null
+/*
+ * 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/iio/sysfs.h>
+#include <linux/delay.h>
+#include <asm/unaligned.h>
+
+#include "hts221.h"
+
+#define HTS221_REG_WHOAMI_ADDR 0x0f
+#define HTS221_REG_WHOAMI_VAL 0xbc
+
+#define HTS221_REG_CNTRL1_ADDR 0x20
+#define HTS221_REG_CNTRL2_ADDR 0x21
+#define HTS221_REG_CNTRL3_ADDR 0x22
+
+#define HTS221_REG_AVG_ADDR 0x10
+#define HTS221_REG_H_OUT_L 0x28
+#define HTS221_REG_T_OUT_L 0x2a
+
+#define HTS221_HUMIDITY_AVG_MASK 0x07
+#define HTS221_TEMP_AVG_MASK 0x38
+
+#define HTS221_ODR_MASK 0x87
+#define HTS221_BDU_MASK BIT(2)
+
+#define HTS221_DRDY_MASK BIT(2)
+
+#define HTS221_ENABLE_SENSOR BIT(7)
+
+#define HTS221_HUMIDITY_AVG_4 0x00 /* 0.4 %RH */
+#define HTS221_HUMIDITY_AVG_8 0x01 /* 0.3 %RH */
+#define HTS221_HUMIDITY_AVG_16 0x02 /* 0.2 %RH */
+#define HTS221_HUMIDITY_AVG_32 0x03 /* 0.15 %RH */
+#define HTS221_HUMIDITY_AVG_64 0x04 /* 0.1 %RH */
+#define HTS221_HUMIDITY_AVG_128 0x05 /* 0.07 %RH */
+#define HTS221_HUMIDITY_AVG_256 0x06 /* 0.05 %RH */
+#define HTS221_HUMIDITY_AVG_512 0x07 /* 0.03 %RH */
+
+#define HTS221_TEMP_AVG_2 0x00 /* 0.08 degC */
+#define HTS221_TEMP_AVG_4 0x08 /* 0.05 degC */
+#define HTS221_TEMP_AVG_8 0x10 /* 0.04 degC */
+#define HTS221_TEMP_AVG_16 0x18 /* 0.03 degC */
+#define HTS221_TEMP_AVG_32 0x20 /* 0.02 degC */
+#define HTS221_TEMP_AVG_64 0x28 /* 0.015 degC */
+#define HTS221_TEMP_AVG_128 0x30 /* 0.01 degC */
+#define HTS221_TEMP_AVG_256 0x38 /* 0.007 degC */
+
+/* calibration registers */
+#define HTS221_REG_0RH_CAL_X_H 0x36
+#define HTS221_REG_1RH_CAL_X_H 0x3a
+#define HTS221_REG_0RH_CAL_Y_H 0x30
+#define HTS221_REG_1RH_CAL_Y_H 0x31
+#define HTS221_REG_0T_CAL_X_L 0x3c
+#define HTS221_REG_1T_CAL_X_L 0x3e
+#define HTS221_REG_0T_CAL_Y_H 0x32
+#define HTS221_REG_1T_CAL_Y_H 0x33
+#define HTS221_REG_T1_T0_CAL_Y_H 0x35
+
+struct hts221_odr {
+ u8 hz;
+ u8 val;
+};
+
+struct hts221_avg {
+ u8 addr;
+ u8 mask;
+ struct hts221_avg_avl avg_avl[HTS221_AVG_DEPTH];
+};
+
+static const struct hts221_odr hts221_odr_table[] = {
+ { 1, 0x01 }, /* 1Hz */
+ { 7, 0x02 }, /* 7Hz */
+ { 13, 0x03 }, /* 12.5Hz */
+};
+
+static const struct hts221_avg hts221_avg_list[] = {
+ {
+ .addr = HTS221_REG_AVG_ADDR,
+ .mask = HTS221_HUMIDITY_AVG_MASK,
+ .avg_avl = {
+ { 4, HTS221_HUMIDITY_AVG_4 },
+ { 8, HTS221_HUMIDITY_AVG_8 },
+ { 16, HTS221_HUMIDITY_AVG_16 },
+ { 32, HTS221_HUMIDITY_AVG_32 },
+ { 64, HTS221_HUMIDITY_AVG_64 },
+ { 128, HTS221_HUMIDITY_AVG_128 },
+ { 256, HTS221_HUMIDITY_AVG_256 },
+ { 512, HTS221_HUMIDITY_AVG_512 },
+ },
+ },
+ {
+ .addr = HTS221_REG_AVG_ADDR,
+ .mask = HTS221_TEMP_AVG_MASK,
+ .avg_avl = {
+ { 2, HTS221_TEMP_AVG_2 },
+ { 4, HTS221_TEMP_AVG_4 },
+ { 8, HTS221_TEMP_AVG_8 },
+ { 16, HTS221_TEMP_AVG_16 },
+ { 32, HTS221_TEMP_AVG_32 },
+ { 64, HTS221_TEMP_AVG_64 },
+ { 128, HTS221_TEMP_AVG_128 },
+ { 256, HTS221_TEMP_AVG_256 },
+ },
+ },
+};
+
+static const struct iio_chan_spec hts221_channels[] = {
+ {
+ .type = IIO_HUMIDITYRELATIVE,
+ .address = HTS221_REG_H_OUT_L,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 16,
+ .endianness = IIO_LE,
+ },
+ },
+ {
+ .type = IIO_TEMP,
+ .address = HTS221_REG_T_OUT_L,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .scan_index = 1,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 16,
+ .endianness = IIO_LE,
+ },
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(2),
+};
+
+static int hts221_write_with_mask(struct hts221_hw *hw, u8 addr, u8 mask,
+ u8 val)
+{
+ u8 data;
+ int err;
+
+ mutex_lock(&hw->lock);
+
+ err = hw->tf->read(hw->dev, addr, sizeof(data), &data);
+ if (err < 0) {
+ dev_err(hw->dev, "failed to read %02x register\n", addr);
+ goto unlock;
+ }
+
+ data = (data & ~mask) | (val & mask);
+
+ err = hw->tf->write(hw->dev, addr, sizeof(data), &data);
+ if (err < 0)
+ dev_err(hw->dev, "failed to write %02x register\n", addr);
+
+unlock:
+ mutex_unlock(&hw->lock);
+
+ return err;
+}
+
+static int hts221_check_whoami(struct hts221_hw *hw)
+{
+ u8 data;
+ int err;
+
+ err = hw->tf->read(hw->dev, HTS221_REG_WHOAMI_ADDR, sizeof(data),
+ &data);
+ if (err < 0) {
+ dev_err(hw->dev, "failed to read whoami register\n");
+ return err;
+ }
+
+ if (data != HTS221_REG_WHOAMI_VAL) {
+ dev_err(hw->dev, "wrong whoami {%02x vs %02x}\n",
+ data, HTS221_REG_WHOAMI_VAL);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+int hts221_config_drdy(struct hts221_hw *hw, bool enable)
+{
+ u8 val = enable ? BIT(2) : 0;
+ int err;
+
+ err = hts221_write_with_mask(hw, HTS221_REG_CNTRL3_ADDR,
+ HTS221_DRDY_MASK, val);
+
+ return err < 0 ? err : 0;
+}
+
+static int hts221_update_odr(struct hts221_hw *hw, u8 odr)
+{
+ int i, err;
+ u8 val;
+
+ for (i = 0; i < ARRAY_SIZE(hts221_odr_table); i++)
+ if (hts221_odr_table[i].hz == odr)
+ break;
+
+ if (i == ARRAY_SIZE(hts221_odr_table))
+ return -EINVAL;
+
+ val = HTS221_ENABLE_SENSOR | HTS221_BDU_MASK | hts221_odr_table[i].val;
+ err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
+ HTS221_ODR_MASK, val);
+ if (err < 0)
+ return err;
+
+ hw->odr = odr;
+
+ return 0;
+}
+
+static int hts221_update_avg(struct hts221_hw *hw,
+ enum hts221_sensor_type type,
+ u16 val)
+{
+ int i, err;
+ const struct hts221_avg *avg = &hts221_avg_list[type];
+
+ for (i = 0; i < HTS221_AVG_DEPTH; i++)
+ if (avg->avg_avl[i].avg == val)
+ break;
+
+ if (i == HTS221_AVG_DEPTH)
+ return -EINVAL;
+
+ err = hts221_write_with_mask(hw, avg->addr, avg->mask,
+ avg->avg_avl[i].val);
+ if (err < 0)
+ return err;
+
+ hw->sensors[type].cur_avg_idx = i;
+
+ return 0;
+}
+
+static ssize_t hts221_sysfs_sampling_freq(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int i;
+ ssize_t len = 0;
+
+ for (i = 0; i < ARRAY_SIZE(hts221_odr_table); i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
+ hts221_odr_table[i].hz);
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static ssize_t
+hts221_sysfs_rh_oversampling_avail(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ const struct hts221_avg *avg = &hts221_avg_list[HTS221_SENSOR_H];
+ ssize_t len = 0;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(avg->avg_avl); i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
+ avg->avg_avl[i].avg);
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static ssize_t
+hts221_sysfs_temp_oversampling_avail(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ const struct hts221_avg *avg = &hts221_avg_list[HTS221_SENSOR_T];
+ ssize_t len = 0;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(avg->avg_avl); i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
+ avg->avg_avl[i].avg);
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+int hts221_power_on(struct hts221_hw *hw)
+{
+ return hts221_update_odr(hw, hw->odr);
+}
+
+int hts221_power_off(struct hts221_hw *hw)
+{
+ u8 data[] = {0x00, 0x00};
+
+ return hw->tf->write(hw->dev, HTS221_REG_CNTRL1_ADDR, sizeof(data),
+ data);
+}
+
+static int hts221_parse_temp_caldata(struct hts221_hw *hw)
+{
+ int err, *slope, *b_gen;
+ s16 cal_x0, cal_x1, cal_y0, cal_y1;
+ u8 cal0, cal1;
+
+ err = hw->tf->read(hw->dev, HTS221_REG_0T_CAL_Y_H,
+ sizeof(cal0), &cal0);
+ if (err < 0)
+ return err;
+
+ err = hw->tf->read(hw->dev, HTS221_REG_T1_T0_CAL_Y_H,
+ sizeof(cal1), &cal1);
+ if (err < 0)
+ return err;
+ cal_y0 = (le16_to_cpu(cal1 & 0x3) << 8) | cal0;
+
+ err = hw->tf->read(hw->dev, HTS221_REG_1T_CAL_Y_H,
+ sizeof(cal0), &cal0);
+ if (err < 0)
+ return err;
+ cal_y1 = (((cal1 & 0xc) >> 2) << 8) | cal0;
+
+ err = hw->tf->read(hw->dev, HTS221_REG_0T_CAL_X_L, sizeof(cal_x0),
+ (u8 *)&cal_x0);
+ if (err < 0)
+ return err;
+ cal_x0 = le16_to_cpu(cal_x0);
+
+ err = hw->tf->read(hw->dev, HTS221_REG_1T_CAL_X_L, sizeof(cal_x1),
+ (u8 *)&cal_x1);
+ if (err < 0)
+ return err;
+ cal_x1 = le16_to_cpu(cal_x1);
+
+ slope = &hw->sensors[HTS221_SENSOR_T].slope;
+ b_gen = &hw->sensors[HTS221_SENSOR_T].b_gen;
+
+ *slope = ((cal_y1 - cal_y0) * 8000) / (cal_x1 - cal_x0);
+ *b_gen = (((s32)cal_x1 * cal_y0 - (s32)cal_x0 * cal_y1) * 1000) /
+ (cal_x1 - cal_x0);
+ *b_gen *= 8;
+
+ return 0;
+}
+
+static int hts221_parse_rh_caldata(struct hts221_hw *hw)
+{
+ int err, *slope, *b_gen;
+ s16 cal_x0, cal_x1, cal_y0, cal_y1;
+ u8 data;
+
+ err = hw->tf->read(hw->dev, HTS221_REG_0RH_CAL_Y_H, sizeof(data),
+ &data);
+ if (err < 0)
+ return err;
+ cal_y0 = data;
+
+ err = hw->tf->read(hw->dev, HTS221_REG_1RH_CAL_Y_H, sizeof(data),
+ &data);
+ if (err < 0)
+ return err;
+ cal_y1 = data;
+
+ err = hw->tf->read(hw->dev, HTS221_REG_0RH_CAL_X_H, sizeof(cal_x0),
+ (u8 *)&cal_x0);
+ if (err < 0)
+ return err;
+ cal_x0 = le16_to_cpu(cal_x0);
+
+ err = hw->tf->read(hw->dev, HTS221_REG_1RH_CAL_X_H, sizeof(cal_x1),
+ (u8 *)&cal_x1);
+ if (err < 0)
+ return err;
+ cal_x1 = le16_to_cpu(cal_x1);
+
+ slope = &hw->sensors[HTS221_SENSOR_H].slope;
+ b_gen = &hw->sensors[HTS221_SENSOR_H].b_gen;
+
+ *slope = ((cal_y1 - cal_y0) * 8000) / (cal_x1 - cal_x0);
+ *b_gen = (((s32)cal_x1 * cal_y0 - (s32)cal_x0 * cal_y1) * 1000) /
+ (cal_x1 - cal_x0);
+ *b_gen *= 8;
+
+ return 0;
+}
+
+static int hts221_get_sensor_scale(struct hts221_hw *hw,
+ enum iio_chan_type ch_type,
+ int *val, int *val2)
+{
+ s64 tmp;
+ s32 rem, div, data;
+
+ switch (ch_type) {
+ case IIO_HUMIDITYRELATIVE:
+ data = hw->sensors[HTS221_SENSOR_H].slope;
+ div = (1 << 4) * 1000;
+ break;
+ case IIO_TEMP:
+ data = hw->sensors[HTS221_SENSOR_T].slope;
+ div = (1 << 6) * 1000;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ tmp = div_s64(data * 1000000000LL, div);
+ tmp = div_s64_rem(tmp, 1000000000LL, &rem);
+
+ *val = tmp;
+ *val2 = rem;
+
+ return IIO_VAL_INT_PLUS_NANO;
+}
+
+static int hts221_get_sensor_offset(struct hts221_hw *hw,
+ enum iio_chan_type ch_type,
+ int *val, int *val2)
+{
+ s64 tmp;
+ s32 rem, div, data;
+
+ switch (ch_type) {
+ case IIO_HUMIDITYRELATIVE:
+ data = hw->sensors[HTS221_SENSOR_H].b_gen;
+ div = hw->sensors[HTS221_SENSOR_H].slope;
+ break;
+ case IIO_TEMP:
+ data = hw->sensors[HTS221_SENSOR_T].b_gen;
+ div = hw->sensors[HTS221_SENSOR_T].slope;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ tmp = div_s64(data * 1000000000LL, div);
+ tmp = div_s64_rem(tmp, 1000000000LL, &rem);
+
+ *val = tmp;
+ *val2 = rem;
+
+ return IIO_VAL_INT_PLUS_NANO;
+}
+
+static int hts221_read_oneshot(struct hts221_hw *hw, u8 addr, int *val)
+{
+ u8 data[HTS221_DATA_SIZE];
+ int err;
+
+ err = hts221_power_on(hw);
+ if (err < 0)
+ return err;
+
+ msleep(50);
+
+ err = hw->tf->read(hw->dev, addr, sizeof(data), data);
+ if (err < 0)
+ return err;
+
+ hts221_power_off(hw);
+
+ *val = (s16)get_unaligned_le16(data);
+
+ return IIO_VAL_INT;
+}
+
+static int hts221_read_raw(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *ch,
+ int *val, int *val2, long mask)
+{
+ struct hts221_hw *hw = iio_priv(iio_dev);
+ int ret;
+
+ ret = iio_device_claim_direct_mode(iio_dev);
+ if (ret)
+ return ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = hts221_read_oneshot(hw, ch->address, val);
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ ret = hts221_get_sensor_scale(hw, ch->type, val, val2);
+ break;
+ case IIO_CHAN_INFO_OFFSET:
+ ret = hts221_get_sensor_offset(hw, ch->type, val, val2);
+ break;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *val = hw->odr;
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO: {
+ u8 idx;
+ const struct hts221_avg *avg;
+
+ switch (ch->type) {
+ case IIO_HUMIDITYRELATIVE:
+ avg = &hts221_avg_list[HTS221_SENSOR_H];
+ idx = hw->sensors[HTS221_SENSOR_H].cur_avg_idx;
+ *val = avg->avg_avl[idx].avg;
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_TEMP:
+ avg = &hts221_avg_list[HTS221_SENSOR_T];
+ idx = hw->sensors[HTS221_SENSOR_T].cur_avg_idx;
+ *val = avg->avg_avl[idx].avg;
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ break;
+ }
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ iio_device_release_direct_mode(iio_dev);
+
+ return ret;
+}
+
+static int hts221_write_raw(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct hts221_hw *hw = iio_priv(iio_dev);
+ int ret;
+
+ ret = iio_device_claim_direct_mode(iio_dev);
+ if (ret)
+ return ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret = hts221_update_odr(hw, val);
+ break;
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ switch (chan->type) {
+ case IIO_HUMIDITYRELATIVE:
+ ret = hts221_update_avg(hw, HTS221_SENSOR_H, val);
+ break;
+ case IIO_TEMP:
+ ret = hts221_update_avg(hw, HTS221_SENSOR_T, val);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ iio_device_release_direct_mode(iio_dev);
+
+ return ret;
+}
+
+static int hts221_validate_trigger(struct iio_dev *iio_dev,
+ struct iio_trigger *trig)
+{
+ struct hts221_hw *hw = iio_priv(iio_dev);
+
+ return hw->trig == trig ? 0 : -EINVAL;
+}
+
+static IIO_DEVICE_ATTR(in_humidity_oversampling_ratio_available, S_IRUGO,
+ hts221_sysfs_rh_oversampling_avail, NULL, 0);
+static IIO_DEVICE_ATTR(in_temp_oversampling_ratio_available, S_IRUGO,
+ hts221_sysfs_temp_oversampling_avail, NULL, 0);
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hts221_sysfs_sampling_freq);
+
+static struct attribute *hts221_attributes[] = {
+ &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+ &iio_dev_attr_in_humidity_oversampling_ratio_available.dev_attr.attr,
+ &iio_dev_attr_in_temp_oversampling_ratio_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group hts221_attribute_group = {
+ .attrs = hts221_attributes,
+};
+
+static const struct iio_info hts221_info = {
+ .driver_module = THIS_MODULE,
+ .attrs = &hts221_attribute_group,
+ .read_raw = hts221_read_raw,
+ .write_raw = hts221_write_raw,
+ .validate_trigger = hts221_validate_trigger,
+};
+
+static const unsigned long hts221_scan_masks[] = {0x3, 0x0};
+
+int hts221_probe(struct iio_dev *iio_dev)
+{
+ struct hts221_hw *hw = iio_priv(iio_dev);
+ int err;
+ u8 data;
+
+ mutex_init(&hw->lock);
+
+ err = hts221_check_whoami(hw);
+ if (err < 0)
+ return err;
+
+ hw->odr = hts221_odr_table[0].hz;
+
+ iio_dev->modes = INDIO_DIRECT_MODE;
+ iio_dev->dev.parent = hw->dev;
+ iio_dev->available_scan_masks = hts221_scan_masks;
+ iio_dev->channels = hts221_channels;
+ iio_dev->num_channels = ARRAY_SIZE(hts221_channels);
+ iio_dev->name = HTS221_DEV_NAME;
+ iio_dev->info = &hts221_info;
+
+ /* configure humidity sensor */
+ err = hts221_parse_rh_caldata(hw);
+ if (err < 0) {
+ dev_err(hw->dev, "failed to get rh calibration data\n");
+ return err;
+ }
+
+ data = hts221_avg_list[HTS221_SENSOR_H].avg_avl[3].avg;
+ err = hts221_update_avg(hw, HTS221_SENSOR_H, data);
+ if (err < 0) {
+ dev_err(hw->dev, "failed to set rh oversampling ratio\n");
+ return err;
+ }
+
+ /* configure temperature sensor */
+ err = hts221_parse_temp_caldata(hw);
+ if (err < 0) {
+ dev_err(hw->dev,
+ "failed to get temperature calibration data\n");
+ return err;
+ }
+
+ data = hts221_avg_list[HTS221_SENSOR_T].avg_avl[3].avg;
+ err = hts221_update_avg(hw, HTS221_SENSOR_T, data);
+ if (err < 0) {
+ dev_err(hw->dev,
+ "failed to set temperature oversampling ratio\n");
+ return err;
+ }
+
+ if (hw->irq > 0) {
+ err = hts221_allocate_buffers(hw);
+ if (err < 0)
+ return err;
+
+ err = hts221_allocate_trigger(hw);
+ if (err)
+ return err;
+ }
+
+ return devm_iio_device_register(hw->dev, iio_dev);
+}
+EXPORT_SYMBOL(hts221_probe);
+
+MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics hts221 sensor driver");
+MODULE_LICENSE("GPL v2");
projects / users / willy / pagecache.git / commitdiff