diff options
Diffstat (limited to 'drivers/iio/health/afe4404.c')
| -rw-r--r-- | drivers/iio/health/afe4404.c | 630 |
1 files changed, 630 insertions, 0 deletions
diff --git a/drivers/iio/health/afe4404.c b/drivers/iio/health/afe4404.c new file mode 100644 index 000000000..0eaa34da5 --- /dev/null +++ b/drivers/iio/health/afe4404.c @@ -0,0 +1,630 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AFE4404 Heart Rate Monitors and Low-Cost Pulse Oximeters + * + * Copyright (C) 2015-2016 Texas Instruments Incorporated - https://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, led_field, offdac_field; + int ret; + + switch (chan->type) { + case IIO_INTENSITY: + switch (mask) { + case IIO_CHAN_INFO_RAW: + value_reg = afe4404_channel_values[chan->address]; + ret = regmap_read(afe->regmap, value_reg, val); + if (ret) + return ret; + return IIO_VAL_INT; + case IIO_CHAN_INFO_OFFSET: + offdac_field = afe4404_channel_offdacs[chan->address]; + 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: + led_field = afe4404_channel_leds[chan->address]; + 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, offdac_field; + + switch (chan->type) { + case IIO_INTENSITY: + switch (mask) { + case IIO_CHAN_INFO_OFFSET: + offdac_field = afe4404_channel_offdacs[chan->address]; + return regmap_field_write(afe->fields[offdac_field], val); + } + break; + case IIO_CURRENT: + switch (mask) { + case IIO_CHAN_INFO_RAW: + led_field = afe4404_channel_leds[chan->address]; + 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->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"); |