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Diffstat (limited to 'drivers/iio/health/afe4404.c')
-rw-r--r--drivers/iio/health/afe4404.c637
1 files changed, 637 insertions, 0 deletions
diff --git a/drivers/iio/health/afe4404.c b/drivers/iio/health/afe4404.c
new file mode 100644
index 000000000..23e1ac650
--- /dev/null
+++ b/drivers/iio/health/afe4404.c
@@ -0,0 +1,637 @@
+/*
+ * AFE4404 Heart Rate Monitors and Low-Cost Pulse Oximeters
+ *
+ * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
+ * Andrew F. Davis <afd@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/sysfs.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+
+#include "afe440x.h"
+
+#define AFE4404_DRIVER_NAME "afe4404"
+
+/* AFE4404 registers */
+#define AFE4404_TIA_GAIN_SEP 0x20
+#define AFE4404_TIA_GAIN 0x21
+#define AFE4404_PROG_TG_STC 0x34
+#define AFE4404_PROG_TG_ENDC 0x35
+#define AFE4404_LED3LEDSTC 0x36
+#define AFE4404_LED3LEDENDC 0x37
+#define AFE4404_CLKDIV_PRF 0x39
+#define AFE4404_OFFDAC 0x3a
+#define AFE4404_DEC 0x3d
+#define AFE4404_AVG_LED2_ALED2VAL 0x3f
+#define AFE4404_AVG_LED1_ALED1VAL 0x40
+
+/* AFE4404 CONTROL2 register fields */
+#define AFE440X_CONTROL2_OSC_ENABLE BIT(9)
+
+enum afe4404_fields {
+ /* Gains */
+ F_TIA_GAIN_SEP, F_TIA_CF_SEP,
+ F_TIA_GAIN, TIA_CF,
+
+ /* LED Current */
+ F_ILED1, F_ILED2, F_ILED3,
+
+ /* Offset DAC */
+ F_OFFDAC_AMB2, F_OFFDAC_LED1, F_OFFDAC_AMB1, F_OFFDAC_LED2,
+
+ /* sentinel */
+ F_MAX_FIELDS
+};
+
+static const struct reg_field afe4404_reg_fields[] = {
+ /* Gains */
+ [F_TIA_GAIN_SEP] = REG_FIELD(AFE4404_TIA_GAIN_SEP, 0, 2),
+ [F_TIA_CF_SEP] = REG_FIELD(AFE4404_TIA_GAIN_SEP, 3, 5),
+ [F_TIA_GAIN] = REG_FIELD(AFE4404_TIA_GAIN, 0, 2),
+ [TIA_CF] = REG_FIELD(AFE4404_TIA_GAIN, 3, 5),
+ /* LED Current */
+ [F_ILED1] = REG_FIELD(AFE440X_LEDCNTRL, 0, 5),
+ [F_ILED2] = REG_FIELD(AFE440X_LEDCNTRL, 6, 11),
+ [F_ILED3] = REG_FIELD(AFE440X_LEDCNTRL, 12, 17),
+ /* Offset DAC */
+ [F_OFFDAC_AMB2] = REG_FIELD(AFE4404_OFFDAC, 0, 4),
+ [F_OFFDAC_LED1] = REG_FIELD(AFE4404_OFFDAC, 5, 9),
+ [F_OFFDAC_AMB1] = REG_FIELD(AFE4404_OFFDAC, 10, 14),
+ [F_OFFDAC_LED2] = REG_FIELD(AFE4404_OFFDAC, 15, 19),
+};
+
+/**
+ * struct afe4404_data - AFE4404 device instance data
+ * @dev: Device structure
+ * @regmap: Register map of the device
+ * @fields: Register fields of the device
+ * @regulator: Pointer to the regulator for the IC
+ * @trig: IIO trigger for this device
+ * @irq: ADC_RDY line interrupt number
+ * @buffer: Used to construct a scan to push to the iio buffer.
+ */
+struct afe4404_data {
+ struct device *dev;
+ struct regmap *regmap;
+ struct regmap_field *fields[F_MAX_FIELDS];
+ struct regulator *regulator;
+ struct iio_trigger *trig;
+ int irq;
+ s32 buffer[10] __aligned(8);
+};
+
+enum afe4404_chan_id {
+ LED2 = 1,
+ ALED2,
+ LED1,
+ ALED1,
+ LED2_ALED2,
+ LED1_ALED1,
+};
+
+static const unsigned int afe4404_channel_values[] = {
+ [LED2] = AFE440X_LED2VAL,
+ [ALED2] = AFE440X_ALED2VAL,
+ [LED1] = AFE440X_LED1VAL,
+ [ALED1] = AFE440X_ALED1VAL,
+ [LED2_ALED2] = AFE440X_LED2_ALED2VAL,
+ [LED1_ALED1] = AFE440X_LED1_ALED1VAL,
+};
+
+static const unsigned int afe4404_channel_leds[] = {
+ [LED2] = F_ILED2,
+ [ALED2] = F_ILED3,
+ [LED1] = F_ILED1,
+};
+
+static const unsigned int afe4404_channel_offdacs[] = {
+ [LED2] = F_OFFDAC_LED2,
+ [ALED2] = F_OFFDAC_AMB2,
+ [LED1] = F_OFFDAC_LED1,
+ [ALED1] = F_OFFDAC_AMB1,
+};
+
+static const struct iio_chan_spec afe4404_channels[] = {
+ /* ADC values */
+ AFE440X_INTENSITY_CHAN(LED2, BIT(IIO_CHAN_INFO_OFFSET)),
+ AFE440X_INTENSITY_CHAN(ALED2, BIT(IIO_CHAN_INFO_OFFSET)),
+ AFE440X_INTENSITY_CHAN(LED1, BIT(IIO_CHAN_INFO_OFFSET)),
+ AFE440X_INTENSITY_CHAN(ALED1, BIT(IIO_CHAN_INFO_OFFSET)),
+ AFE440X_INTENSITY_CHAN(LED2_ALED2, 0),
+ AFE440X_INTENSITY_CHAN(LED1_ALED1, 0),
+ /* LED current */
+ AFE440X_CURRENT_CHAN(LED2),
+ AFE440X_CURRENT_CHAN(ALED2),
+ AFE440X_CURRENT_CHAN(LED1),
+};
+
+static const struct afe440x_val_table afe4404_res_table[] = {
+ { .integer = 500000, .fract = 0 },
+ { .integer = 250000, .fract = 0 },
+ { .integer = 100000, .fract = 0 },
+ { .integer = 50000, .fract = 0 },
+ { .integer = 25000, .fract = 0 },
+ { .integer = 10000, .fract = 0 },
+ { .integer = 1000000, .fract = 0 },
+ { .integer = 2000000, .fract = 0 },
+};
+AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4404_res_table);
+
+static const struct afe440x_val_table afe4404_cap_table[] = {
+ { .integer = 0, .fract = 5000 },
+ { .integer = 0, .fract = 2500 },
+ { .integer = 0, .fract = 10000 },
+ { .integer = 0, .fract = 7500 },
+ { .integer = 0, .fract = 20000 },
+ { .integer = 0, .fract = 17500 },
+ { .integer = 0, .fract = 25000 },
+ { .integer = 0, .fract = 22500 },
+};
+AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4404_cap_table);
+
+static ssize_t afe440x_show_register(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct afe4404_data *afe = iio_priv(indio_dev);
+ struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
+ unsigned int reg_val;
+ int vals[2];
+ int ret;
+
+ ret = regmap_field_read(afe->fields[afe440x_attr->field], &reg_val);
+ if (ret)
+ return ret;
+
+ if (reg_val >= afe440x_attr->table_size)
+ return -EINVAL;
+
+ vals[0] = afe440x_attr->val_table[reg_val].integer;
+ vals[1] = afe440x_attr->val_table[reg_val].fract;
+
+ return iio_format_value(buf, IIO_VAL_INT_PLUS_MICRO, 2, vals);
+}
+
+static ssize_t afe440x_store_register(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct afe4404_data *afe = iio_priv(indio_dev);
+ struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
+ int val, integer, fract, ret;
+
+ ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
+ if (ret)
+ return ret;
+
+ for (val = 0; val < afe440x_attr->table_size; val++)
+ if (afe440x_attr->val_table[val].integer == integer &&
+ afe440x_attr->val_table[val].fract == fract)
+ break;
+ if (val == afe440x_attr->table_size)
+ return -EINVAL;
+
+ ret = regmap_field_write(afe->fields[afe440x_attr->field], val);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static AFE440X_ATTR(in_intensity1_resistance, F_TIA_GAIN_SEP, afe4404_res_table);
+static AFE440X_ATTR(in_intensity1_capacitance, F_TIA_CF_SEP, afe4404_cap_table);
+
+static AFE440X_ATTR(in_intensity2_resistance, F_TIA_GAIN_SEP, afe4404_res_table);
+static AFE440X_ATTR(in_intensity2_capacitance, F_TIA_CF_SEP, afe4404_cap_table);
+
+static AFE440X_ATTR(in_intensity3_resistance, F_TIA_GAIN, afe4404_res_table);
+static AFE440X_ATTR(in_intensity3_capacitance, TIA_CF, afe4404_cap_table);
+
+static AFE440X_ATTR(in_intensity4_resistance, F_TIA_GAIN, afe4404_res_table);
+static AFE440X_ATTR(in_intensity4_capacitance, TIA_CF, afe4404_cap_table);
+
+static struct attribute *afe440x_attributes[] = {
+ &dev_attr_in_intensity_resistance_available.attr,
+ &dev_attr_in_intensity_capacitance_available.attr,
+ &afe440x_attr_in_intensity1_resistance.dev_attr.attr,
+ &afe440x_attr_in_intensity1_capacitance.dev_attr.attr,
+ &afe440x_attr_in_intensity2_resistance.dev_attr.attr,
+ &afe440x_attr_in_intensity2_capacitance.dev_attr.attr,
+ &afe440x_attr_in_intensity3_resistance.dev_attr.attr,
+ &afe440x_attr_in_intensity3_capacitance.dev_attr.attr,
+ &afe440x_attr_in_intensity4_resistance.dev_attr.attr,
+ &afe440x_attr_in_intensity4_capacitance.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group afe440x_attribute_group = {
+ .attrs = afe440x_attributes
+};
+
+static int afe4404_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct afe4404_data *afe = iio_priv(indio_dev);
+ unsigned int value_reg = afe4404_channel_values[chan->address];
+ unsigned int led_field = afe4404_channel_leds[chan->address];
+ unsigned int offdac_field = afe4404_channel_offdacs[chan->address];
+ int ret;
+
+ switch (chan->type) {
+ case IIO_INTENSITY:
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = regmap_read(afe->regmap, value_reg, val);
+ if (ret)
+ return ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_OFFSET:
+ ret = regmap_field_read(afe->fields[offdac_field], val);
+ if (ret)
+ return ret;
+ return IIO_VAL_INT;
+ }
+ break;
+ case IIO_CURRENT:
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = regmap_field_read(afe->fields[led_field], val);
+ if (ret)
+ return ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 0;
+ *val2 = 800000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static int afe4404_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct afe4404_data *afe = iio_priv(indio_dev);
+ unsigned int led_field = afe4404_channel_leds[chan->address];
+ unsigned int offdac_field = afe4404_channel_offdacs[chan->address];
+
+ switch (chan->type) {
+ case IIO_INTENSITY:
+ switch (mask) {
+ case IIO_CHAN_INFO_OFFSET:
+ return regmap_field_write(afe->fields[offdac_field], val);
+ }
+ break;
+ case IIO_CURRENT:
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ return regmap_field_write(afe->fields[led_field], val);
+ }
+ break;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static const struct iio_info afe4404_iio_info = {
+ .attrs = &afe440x_attribute_group,
+ .read_raw = afe4404_read_raw,
+ .write_raw = afe4404_write_raw,
+};
+
+static irqreturn_t afe4404_trigger_handler(int irq, void *private)
+{
+ struct iio_poll_func *pf = private;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct afe4404_data *afe = iio_priv(indio_dev);
+ int ret, bit, i = 0;
+
+ for_each_set_bit(bit, indio_dev->active_scan_mask,
+ indio_dev->masklength) {
+ ret = regmap_read(afe->regmap, afe4404_channel_values[bit],
+ &afe->buffer[i++]);
+ if (ret)
+ goto err;
+ }
+
+ iio_push_to_buffers_with_timestamp(indio_dev, afe->buffer,
+ pf->timestamp);
+err:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static const struct iio_trigger_ops afe4404_trigger_ops = {
+};
+
+/* Default timings from data-sheet */
+#define AFE4404_TIMING_PAIRS \
+ { AFE440X_PRPCOUNT, 39999 }, \
+ { AFE440X_LED2LEDSTC, 0 }, \
+ { AFE440X_LED2LEDENDC, 398 }, \
+ { AFE440X_LED2STC, 80 }, \
+ { AFE440X_LED2ENDC, 398 }, \
+ { AFE440X_ADCRSTSTCT0, 5600 }, \
+ { AFE440X_ADCRSTENDCT0, 5606 }, \
+ { AFE440X_LED2CONVST, 5607 }, \
+ { AFE440X_LED2CONVEND, 6066 }, \
+ { AFE4404_LED3LEDSTC, 400 }, \
+ { AFE4404_LED3LEDENDC, 798 }, \
+ { AFE440X_ALED2STC, 480 }, \
+ { AFE440X_ALED2ENDC, 798 }, \
+ { AFE440X_ADCRSTSTCT1, 6068 }, \
+ { AFE440X_ADCRSTENDCT1, 6074 }, \
+ { AFE440X_ALED2CONVST, 6075 }, \
+ { AFE440X_ALED2CONVEND, 6534 }, \
+ { AFE440X_LED1LEDSTC, 800 }, \
+ { AFE440X_LED1LEDENDC, 1198 }, \
+ { AFE440X_LED1STC, 880 }, \
+ { AFE440X_LED1ENDC, 1198 }, \
+ { AFE440X_ADCRSTSTCT2, 6536 }, \
+ { AFE440X_ADCRSTENDCT2, 6542 }, \
+ { AFE440X_LED1CONVST, 6543 }, \
+ { AFE440X_LED1CONVEND, 7003 }, \
+ { AFE440X_ALED1STC, 1280 }, \
+ { AFE440X_ALED1ENDC, 1598 }, \
+ { AFE440X_ADCRSTSTCT3, 7005 }, \
+ { AFE440X_ADCRSTENDCT3, 7011 }, \
+ { AFE440X_ALED1CONVST, 7012 }, \
+ { AFE440X_ALED1CONVEND, 7471 }, \
+ { AFE440X_PDNCYCLESTC, 7671 }, \
+ { AFE440X_PDNCYCLEENDC, 39199 }
+
+static const struct reg_sequence afe4404_reg_sequences[] = {
+ AFE4404_TIMING_PAIRS,
+ { AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN },
+ { AFE4404_TIA_GAIN_SEP, AFE440X_TIAGAIN_ENSEPGAIN },
+ { AFE440X_CONTROL2, AFE440X_CONTROL2_OSC_ENABLE },
+};
+
+static const struct regmap_range afe4404_yes_ranges[] = {
+ regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL),
+ regmap_reg_range(AFE4404_AVG_LED2_ALED2VAL, AFE4404_AVG_LED1_ALED1VAL),
+};
+
+static const struct regmap_access_table afe4404_volatile_table = {
+ .yes_ranges = afe4404_yes_ranges,
+ .n_yes_ranges = ARRAY_SIZE(afe4404_yes_ranges),
+};
+
+static const struct regmap_config afe4404_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 24,
+
+ .max_register = AFE4404_AVG_LED1_ALED1VAL,
+ .cache_type = REGCACHE_RBTREE,
+ .volatile_table = &afe4404_volatile_table,
+};
+
+static const struct of_device_id afe4404_of_match[] = {
+ { .compatible = "ti,afe4404", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, afe4404_of_match);
+
+static int __maybe_unused afe4404_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct afe4404_data *afe = iio_priv(indio_dev);
+ int ret;
+
+ ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
+ AFE440X_CONTROL2_PDN_AFE,
+ AFE440X_CONTROL2_PDN_AFE);
+ if (ret)
+ return ret;
+
+ ret = regulator_disable(afe->regulator);
+ if (ret) {
+ dev_err(dev, "Unable to disable regulator\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __maybe_unused afe4404_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct afe4404_data *afe = iio_priv(indio_dev);
+ int ret;
+
+ ret = regulator_enable(afe->regulator);
+ if (ret) {
+ dev_err(dev, "Unable to enable regulator\n");
+ return ret;
+ }
+
+ ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
+ AFE440X_CONTROL2_PDN_AFE, 0);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(afe4404_pm_ops, afe4404_suspend, afe4404_resume);
+
+static int afe4404_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct iio_dev *indio_dev;
+ struct afe4404_data *afe;
+ int i, ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*afe));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ afe = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+
+ afe->dev = &client->dev;
+ afe->irq = client->irq;
+
+ afe->regmap = devm_regmap_init_i2c(client, &afe4404_regmap_config);
+ if (IS_ERR(afe->regmap)) {
+ dev_err(afe->dev, "Unable to allocate register map\n");
+ return PTR_ERR(afe->regmap);
+ }
+
+ for (i = 0; i < F_MAX_FIELDS; i++) {
+ afe->fields[i] = devm_regmap_field_alloc(afe->dev, afe->regmap,
+ afe4404_reg_fields[i]);
+ if (IS_ERR(afe->fields[i])) {
+ dev_err(afe->dev, "Unable to allocate regmap fields\n");
+ return PTR_ERR(afe->fields[i]);
+ }
+ }
+
+ afe->regulator = devm_regulator_get(afe->dev, "tx_sup");
+ if (IS_ERR(afe->regulator)) {
+ dev_err(afe->dev, "Unable to get regulator\n");
+ return PTR_ERR(afe->regulator);
+ }
+ ret = regulator_enable(afe->regulator);
+ if (ret) {
+ dev_err(afe->dev, "Unable to enable regulator\n");
+ return ret;
+ }
+
+ ret = regmap_write(afe->regmap, AFE440X_CONTROL0,
+ AFE440X_CONTROL0_SW_RESET);
+ if (ret) {
+ dev_err(afe->dev, "Unable to reset device\n");
+ goto disable_reg;
+ }
+
+ ret = regmap_multi_reg_write(afe->regmap, afe4404_reg_sequences,
+ ARRAY_SIZE(afe4404_reg_sequences));
+ if (ret) {
+ dev_err(afe->dev, "Unable to set register defaults\n");
+ goto disable_reg;
+ }
+
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->dev.parent = afe->dev;
+ indio_dev->channels = afe4404_channels;
+ indio_dev->num_channels = ARRAY_SIZE(afe4404_channels);
+ indio_dev->name = AFE4404_DRIVER_NAME;
+ indio_dev->info = &afe4404_iio_info;
+
+ if (afe->irq > 0) {
+ afe->trig = devm_iio_trigger_alloc(afe->dev,
+ "%s-dev%d",
+ indio_dev->name,
+ indio_dev->id);
+ if (!afe->trig) {
+ dev_err(afe->dev, "Unable to allocate IIO trigger\n");
+ ret = -ENOMEM;
+ goto disable_reg;
+ }
+
+ iio_trigger_set_drvdata(afe->trig, indio_dev);
+
+ afe->trig->ops = &afe4404_trigger_ops;
+ afe->trig->dev.parent = afe->dev;
+
+ ret = iio_trigger_register(afe->trig);
+ if (ret) {
+ dev_err(afe->dev, "Unable to register IIO trigger\n");
+ goto disable_reg;
+ }
+
+ ret = devm_request_threaded_irq(afe->dev, afe->irq,
+ iio_trigger_generic_data_rdy_poll,
+ NULL, IRQF_ONESHOT,
+ AFE4404_DRIVER_NAME,
+ afe->trig);
+ if (ret) {
+ dev_err(afe->dev, "Unable to request IRQ\n");
+ goto disable_reg;
+ }
+ }
+
+ ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+ afe4404_trigger_handler, NULL);
+ if (ret) {
+ dev_err(afe->dev, "Unable to setup buffer\n");
+ goto unregister_trigger;
+ }
+
+ ret = iio_device_register(indio_dev);
+ if (ret) {
+ dev_err(afe->dev, "Unable to register IIO device\n");
+ goto unregister_triggered_buffer;
+ }
+
+ return 0;
+
+unregister_triggered_buffer:
+ iio_triggered_buffer_cleanup(indio_dev);
+unregister_trigger:
+ if (afe->irq > 0)
+ iio_trigger_unregister(afe->trig);
+disable_reg:
+ regulator_disable(afe->regulator);
+
+ return ret;
+}
+
+static int afe4404_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct afe4404_data *afe = iio_priv(indio_dev);
+ int ret;
+
+ iio_device_unregister(indio_dev);
+
+ iio_triggered_buffer_cleanup(indio_dev);
+
+ if (afe->irq > 0)
+ iio_trigger_unregister(afe->trig);
+
+ ret = regulator_disable(afe->regulator);
+ if (ret) {
+ dev_err(afe->dev, "Unable to disable regulator\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct i2c_device_id afe4404_ids[] = {
+ { "afe4404", 0 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, afe4404_ids);
+
+static struct i2c_driver afe4404_i2c_driver = {
+ .driver = {
+ .name = AFE4404_DRIVER_NAME,
+ .of_match_table = afe4404_of_match,
+ .pm = &afe4404_pm_ops,
+ },
+ .probe = afe4404_probe,
+ .remove = afe4404_remove,
+ .id_table = afe4404_ids,
+};
+module_i2c_driver(afe4404_i2c_driver);
+
+MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
+MODULE_DESCRIPTION("TI AFE4404 Heart Rate Monitor and Pulse Oximeter AFE");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-19 21:58:06 +0000