| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * 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> |
| */ |
| |
| #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], ®_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"); |