> Add driver for the TI AFE4403 heart rate monitor and pulse oximeter. > This device detects reflected LED light fluctuations and presents an ADC > value to the user space for further signal processing. some comments below > Data sheet located here: > http://www.ti.com/product/AFE4403/datasheet > > Signed-off-by: Andrew F. Davis <afd@xxxxxx> > --- > drivers/iio/health/Kconfig | 12 + > drivers/iio/health/Makefile | 1 + > drivers/iio/health/afe4403.c | 698 +++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 711 insertions(+) > create mode 100644 drivers/iio/health/afe4403.c > > diff --git a/drivers/iio/health/Kconfig b/drivers/iio/health/Kconfig > index 632a14b..f0c1977 100644 > --- a/drivers/iio/health/Kconfig > +++ b/drivers/iio/health/Kconfig > @@ -7,6 +7,18 @@ menu "Health Sensors" > > menu "Heart Rate Monitors" > > +config AFE4403 > + tristate "TI AFE4403 Heart Rate Monitor" > + depends on SPI_MASTER > + select IIO_BUFFER > + select IIO_TRIGGERED_BUFFER > + help > + Say yes to choose the Texas Instruments AFE4403 > + heart rate monitor and low-cost pulse oximeter. > + > + To compile this driver as a module, choose M here: the > + module will be called afe4403. > + > config AFE4404 > tristate "TI AFE4404 heart rate and pulse oximeter sensor" > depends on I2C > diff --git a/drivers/iio/health/Makefile b/drivers/iio/health/Makefile > index b37c0d5..9955a2a 100644 > --- a/drivers/iio/health/Makefile > +++ b/drivers/iio/health/Makefile > @@ -4,5 +4,6 @@ > > # When adding new entries keep the list in alphabetical order > > +obj-$(CONFIG_AFE4403) += afe4403.o > obj-$(CONFIG_AFE4404) += afe4404.o > obj-$(CONFIG_MAX30100) += max30100.o > diff --git a/drivers/iio/health/afe4403.c b/drivers/iio/health/afe4403.c > new file mode 100644 > index 0000000..2c8565f > --- /dev/null > +++ b/drivers/iio/health/afe4403.c > @@ -0,0 +1,698 @@ > +/* > + * AFE4403 Heart Rate Monitors and Low-Cost Pulse Oximeters > + * > + * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/ > + * Andrew F. Davis <afd@xxxxxx> > + * > + * 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/kernel.h> > +#include <linux/module.h> > +#include <linux/regmap.h> > +#include <linux/spi/spi.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 AFE4403_DRIVER_NAME "afe4403" > + > +/* AFE4403 Registers */ > +#define AFE4403_TIAGAIN 0x20 > +#define AFE4403_TIA_AMB_GAIN 0x21 > + > +/* AFE4403 GAIN register fields */ > +#define AFE4403_TIAGAIN_RES_MASK GENMASK(2, 0) > +#define AFE4403_TIAGAIN_RES_SHIFT 0 > +#define AFE4403_TIAGAIN_CAP_MASK GENMASK(7, 3) > +#define AFE4403_TIAGAIN_CAP_SHIFT 3 > + > +/* AFE4403 LEDCNTRL register fields */ > +#define AFE440X_LEDCNTRL_LED1_MASK GENMASK(15, 8) if these defines are generic for AFE440X, they should go to the header file; if not, they should be named AFE4403 > +#define AFE440X_LEDCNTRL_LED1_SHIFT 8 > +#define AFE440X_LEDCNTRL_LED2_MASK GENMASK(7, 0) > +#define AFE440X_LEDCNTRL_LED2_SHIFT 0 > +#define AFE440X_LEDCNTRL_LED_RANGE_MASK GENMASK(17, 16) > +#define AFE440X_LEDCNTRL_LED_RANGE_SHIFT 16 > + > +/* AFE4403 CONTROL2 register fields */ > +#define AFE440X_CONTROL2_PWR_DWN_TX BIT(2) > +#define AFE440X_CONTROL2_EN_SLOW_DIAG BIT(8) > +#define AFE440X_CONTROL2_DIAG_OUT_TRI BIT(10) > +#define AFE440X_CONTROL2_TX_BRDG_MOD BIT(11) > +#define AFE440X_CONTROL2_TX_REF_MASK GENMASK(18, 17) > +#define AFE440X_CONTROL2_TX_REF_SHIFT 17 > + > +/* AFE4404 NULL fields */ > +#define NULL_MASK 0 > +#define NULL_SHIFT 0 needed? prefix? > + > +/* AFE4403 LEDCNTRL values */ > +#define AFE440X_LEDCNTRL_RANGE_TX_HALF 0x1 > +#define AFE440X_LEDCNTRL_RANGE_TX_FULL 0x2 > +#define AFE440X_LEDCNTRL_RANGE_TX_OFF 0x3 > + > +/* AFE4403 CONTROL2 values */ > +#define AFE440X_CONTROL2_TX_REF_025 0x0 > +#define AFE440X_CONTROL2_TX_REF_050 0x1 > +#define AFE440X_CONTROL2_TX_REF_100 0x2 > +#define AFE440X_CONTROL2_TX_REF_075 0x3 > + > +/* AFE4403 CONTROL3 values */ > +#define AFE440X_CONTROL3_CLK_DIV_2 0x0 AFE440X (then move to .h) or AFE4403? > +#define AFE440X_CONTROL3_CLK_DIV_4 0x2 > +#define AFE440X_CONTROL3_CLK_DIV_6 0x3 > +#define AFE440X_CONTROL3_CLK_DIV_8 0x4 > +#define AFE440X_CONTROL3_CLK_DIV_12 0x5 > +#define AFE440X_CONTROL3_CLK_DIV_1 0x7 > + > +/* AFE4403 TIAGAIN_CAP values */ > +#define AFE4403_TIAGAIN_CAP_5_P 0x0 > +#define AFE4403_TIAGAIN_CAP_10_P 0x1 > +#define AFE4403_TIAGAIN_CAP_20_P 0x2 > +#define AFE4403_TIAGAIN_CAP_30_P 0x3 > +#define AFE4403_TIAGAIN_CAP_55_P 0x8 > +#define AFE4403_TIAGAIN_CAP_155_P 0x10 > + > +/* AFE4403 TIAGAIN_RES values */ > +#define AFE4403_TIAGAIN_RES_500_K 0x0 > +#define AFE4403_TIAGAIN_RES_250_K 0x1 > +#define AFE4403_TIAGAIN_RES_100_K 0x2 > +#define AFE4403_TIAGAIN_RES_50_K 0x3 > +#define AFE4403_TIAGAIN_RES_25_K 0x4 > +#define AFE4403_TIAGAIN_RES_10_K 0x5 > +#define AFE4403_TIAGAIN_RES_1_M 0x6 > +#define AFE4403_TIAGAIN_RES_NONE 0x7 > + > +/** > + * struct afe4403_data > + * @dev - Device structure > + * @spi - SPI device handle > + * @regmap - Register map of the device > + * @regulator - Pointer to the regulator for the IC > + * @trig - IIO trigger for this device > + * @irq - ADC_RDY line interrupt number > + */ > +struct afe4403_data { > + struct device *dev; > + struct spi_device *spi; > + struct regmap *regmap; > + struct regulator *regulator; > + struct iio_trigger *trig; > + int irq; > +}; > + > +enum afe4403_chan_id { > + LED1, > + ALED1, > + LED2, > + ALED2, > + LED1_ALED1, > + LED2_ALED2, > + ILED1, > + ILED2, > +}; > + > +static const struct afe440x_reg_info afe4403_reg_info[] = { > + AFE440X_REG_INFO(LED1, AFE440X_LED1VAL, 0, NULL), > + AFE440X_REG_INFO(ALED1, AFE440X_ALED1VAL, 0, NULL), > + AFE440X_REG_INFO(LED2, AFE440X_LED2VAL, 0, NULL), > + AFE440X_REG_INFO(ALED2, AFE440X_ALED2VAL, 0, NULL), > + AFE440X_REG_INFO(LED1_ALED1, AFE440X_LED1_ALED1VAL, 0, NULL), > + AFE440X_REG_INFO(LED2_ALED2, AFE440X_LED2_ALED2VAL, 0, NULL), > + AFE440X_REG_INFO(ILED1, AFE440X_LEDCNTRL, 0, AFE440X_LEDCNTRL_LED1), > + AFE440X_REG_INFO(ILED2, AFE440X_LEDCNTRL, 0, AFE440X_LEDCNTRL_LED2), > +}; > + > +static const struct iio_chan_spec afe4403_channels[] = { > + /* ADC values */ > + AFE440X_INTENSITY_CHAN(LED1, "led1", 0), > + AFE440X_INTENSITY_CHAN(ALED1, "led1_ambient", 0), > + AFE440X_INTENSITY_CHAN(LED2, "led2", 0), > + AFE440X_INTENSITY_CHAN(ALED2, "led2_ambient", 0), > + AFE440X_INTENSITY_CHAN(LED1_ALED1, "led1-led1_ambient", 0), > + AFE440X_INTENSITY_CHAN(LED2_ALED2, "led2-led2_ambient", 0), > + /* LED current */ > + AFE440X_CURRENT_CHAN(ILED1, "led1"), > + AFE440X_CURRENT_CHAN(ILED2, "led2"), > +}; > + > +static const struct afe440x_val_table afe4403_res_table[] = { > + { 500000 }, { 250000 }, { 100000 }, { 50000 }, > + { 25000 }, { 10000 }, { 1000000 }, { 0 }, > +}; > +AFE440X_TABLE_ATTR(tia_resistance_available, afe4403_res_table); > + > +static const struct afe440x_val_table afe4403_cap_table[] = { > + { 0, 5000 }, { 0, 10000 }, { 0, 20000 }, { 0, 25000 }, > + { 0, 30000 }, { 0, 35000 }, { 0, 45000 }, { 0, 50000 }, > + { 0, 55000 }, { 0, 60000 }, { 0, 70000 }, { 0, 75000 }, > + { 0, 80000 }, { 0, 85000 }, { 0, 95000 }, { 0, 100000 }, > + { 0, 155000 }, { 0, 160000 }, { 0, 170000 }, { 0, 175000 }, > + { 0, 180000 }, { 0, 185000 }, { 0, 195000 }, { 0, 200000 }, > + { 0, 205000 }, { 0, 210000 }, { 0, 220000 }, { 0, 225000 }, > + { 0, 230000 }, { 0, 235000 }, { 0, 245000 }, { 0, 250000 }, > +}; > +AFE440X_TABLE_ATTR(tia_capacitance_available, afe4403_cap_table); > + > +static ssize_t afe440x_show_register(struct device *dev, > + struct device_attribute *attr, > + char *buf) common code with afe4404? > +{ > + struct iio_dev *indio_dev = dev_to_iio_dev(dev); > + struct afe4403_data *afe = iio_priv(indio_dev); > + struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr); > + unsigned int reg_val, type; > + int vals[2]; > + int ret, val_len; > + > + ret = regmap_read(afe->regmap, afe440x_attr->reg, ®_val); > + if (ret) > + return ret; > + > + reg_val &= afe440x_attr->mask; > + reg_val >>= afe440x_attr->shift; > + > + switch (afe440x_attr->type) { > + case SIMPLE: > + type = IIO_VAL_INT; > + val_len = 1; > + vals[0] = reg_val; > + break; > + case RESISTANCE: > + case CAPACITANCE: > + type = IIO_VAL_INT_PLUS_MICRO; > + val_len = 2; > + if (reg_val < afe440x_attr->table_size) { > + vals[0] = afe440x_attr->val_table[reg_val].integer; > + vals[1] = afe440x_attr->val_table[reg_val].fract; > + break; > + } > + return -EINVAL; > + default: > + return -EINVAL; > + } > + > + return iio_format_value(buf, type, val_len, 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 afe4403_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; > + > + switch (afe440x_attr->type) { > + case SIMPLE: > + val = integer; > + break; > + case RESISTANCE: > + case CAPACITANCE: > + 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; > + break; > + default: > + return -EINVAL; > + } > + > + ret = regmap_update_bits(afe->regmap, afe440x_attr->reg, > + afe440x_attr->mask, > + (val << afe440x_attr->shift)); > + if (ret) > + return ret; > + > + return count; > +} > + > +static AFE440X_ATTR(tia_separate_en, AFE4403_TIAGAIN, AFE440X_TIAGAIN_ENSEPGAIN, SIMPLE, NULL, 0); > + > +static AFE440X_ATTR(tia_resistance1, AFE4403_TIAGAIN, AFE4403_TIAGAIN_RES, RESISTANCE, afe4403_res_table, ARRAY_SIZE(afe4403_res_table)); > +static AFE440X_ATTR(tia_capacitance1, AFE4403_TIAGAIN, AFE4403_TIAGAIN_CAP, CAPACITANCE, afe4403_cap_table, ARRAY_SIZE(afe4403_cap_table)); > + > +static AFE440X_ATTR(tia_resistance2, AFE4403_TIA_AMB_GAIN, AFE4403_TIAGAIN_RES, RESISTANCE, afe4403_res_table, ARRAY_SIZE(afe4403_res_table)); > +static AFE440X_ATTR(tia_capacitance2, AFE4403_TIA_AMB_GAIN, AFE4403_TIAGAIN_RES, CAPACITANCE, afe4403_cap_table, ARRAY_SIZE(afe4403_cap_table)); > + > +static struct attribute *afe440x_attributes[] = { > + &afe440x_attr_tia_separate_en.dev_attr.attr, > + &afe440x_attr_tia_resistance1.dev_attr.attr, > + &afe440x_attr_tia_capacitance1.dev_attr.attr, > + &afe440x_attr_tia_resistance2.dev_attr.attr, > + &afe440x_attr_tia_capacitance2.dev_attr.attr, > + &dev_attr_tia_resistance_available.attr, > + &dev_attr_tia_capacitance_available.attr, > + NULL > +}; > + > +static const struct attribute_group afe440x_attribute_group = { > + .attrs = afe440x_attributes > +}; > + > +static int afe4403_read(struct afe4403_data *afe, unsigned int reg, u32 *val) > +{ > + u8 tx[4] ____cacheline_aligned = {AFE440X_CONTROL0, 0x0, 0x0, > + AFE440X_CONTROL0_READ}; > + u8 rx[3]; > + int ret; > + > + /* Enable reading from the device */ > + ret = spi_write(afe->spi, tx, 4); > + if (ret) > + goto out; > + > + ret = spi_write_then_read(afe->spi, ®, 1, rx, 3); > + if (ret) > + goto out; > + > + *val = (rx[0] << 16) | > + (rx[1] << 8) | > + (rx[2]); > + > + /* Disable reading from the device */ > + tx[3] = AFE440X_CONTROL0_WRITE; > + ret = spi_write(afe->spi, tx, 4); > + if (ret) > + goto out; > + > +out: > + > + return ret; > +} > + > +static int afe4403_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int *val, int *val2, long mask) > +{ > + struct afe4403_data *afe = iio_priv(indio_dev); > + const struct afe440x_reg_info reg_info = afe4403_reg_info[chan->address]; > + int ret; > + > + switch (chan->type) { > + case IIO_INTENSITY: > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + ret = afe4403_read(afe, reg_info.reg, val); > + if (ret) > + return ret; > + return IIO_VAL_INT; > + case IIO_CHAN_INFO_OFFSET: > + ret = regmap_read(afe->regmap, reg_info.offreg, > + val); > + if (ret) > + return ret; > + *val &= reg_info.mask; > + *val >>= reg_info.shift; > + return IIO_VAL_INT; > + } > + break; > + case IIO_CURRENT: > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + ret = regmap_read(afe->regmap, reg_info.reg, val); > + if (ret) > + return ret; > + *val &= reg_info.mask; > + *val >>= reg_info.shift; > + 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 afe4403_write_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int val, int val2, long mask) > +{ > + struct afe4403_data *afe = iio_priv(indio_dev); > + const struct afe440x_reg_info reg_info = afe4403_reg_info[chan->address]; > + > + switch (chan->type) { > + case IIO_INTENSITY: > + switch (mask) { > + case IIO_CHAN_INFO_OFFSET: > + return regmap_update_bits(afe->regmap, > + reg_info.offreg, > + reg_info.mask, > + (val << reg_info.shift)); > + } > + break; > + case IIO_CURRENT: > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + return regmap_update_bits(afe->regmap, > + reg_info.reg, > + reg_info.mask, > + (val << reg_info.shift)); > + } > + break; > + default: > + break; > + } > + > + return -EINVAL; > +} > + > +static const struct iio_info afe4403_iio_info = { > + .attrs = &afe440x_attribute_group, > + .read_raw = afe4403_read_raw, > + .write_raw = afe4403_write_raw, > + .driver_module = THIS_MODULE, > +}; > + > +static irqreturn_t afe4403_trigger_handler(int irq, void *private) > +{ > + struct iio_poll_func *pf = private; > + struct iio_dev *indio_dev = pf->indio_dev; > + struct afe4403_data *afe = iio_priv(indio_dev); > + int ret, bit, i = 0; > + s32 buffer[8]; > + u8 tx[4] ____cacheline_aligned = {AFE440X_CONTROL0, 0x0, 0x0, > + AFE440X_CONTROL0_READ}; > + u8 rx[3]; > + > + /* Enable reading from the device */ > + ret = spi_write(afe->spi, tx, 4); > + if (ret) > + goto err; > + > + for_each_set_bit(bit, indio_dev->active_scan_mask, > + indio_dev->masklength) { > + ret = spi_write_then_read(afe->spi, > + &afe4403_reg_info[bit].reg, 1, > + rx, 3); > + if (ret) > + goto err; > + > + buffer[i++] = (rx[0] << 16) | > + (rx[1] << 8) | > + (rx[2]); > + } > + > + /* Disable reading from the device */ > + tx[3] = AFE440X_CONTROL0_WRITE; > + ret = spi_write(afe->spi, tx, 4); > + if (ret) > + goto err; > + > + iio_push_to_buffers_with_timestamp(indio_dev, buffer, pf->timestamp); > +err: > + iio_trigger_notify_done(indio_dev->trig); > + > + return IRQ_HANDLED; > +} > + > +static const struct iio_trigger_ops afe4403_trigger_ops = { > + .owner = THIS_MODULE, > +}; > + > +#define AFE4403_TIMING_PAIRS \ > + { AFE440X_LED2STC, 0x000050 }, \ > + { AFE440X_LED2ENDC, 0x0003e7 }, \ > + { AFE440X_LED1LEDSTC, 0x0007d0 }, \ > + { AFE440X_LED1LEDENDC, 0x000bb7 }, \ > + { AFE440X_ALED2STC, 0x000438 }, \ > + { AFE440X_ALED2ENDC, 0x0007cf }, \ > + { AFE440X_LED1STC, 0x000820 }, \ > + { AFE440X_LED1ENDC, 0x000bb7 }, \ > + { AFE440X_LED2LEDSTC, 0x000000 }, \ > + { AFE440X_LED2LEDENDC, 0x0003e7 }, \ > + { AFE440X_ALED1STC, 0x000c08 }, \ > + { AFE440X_ALED1ENDC, 0x000f9f }, \ > + { AFE440X_LED2CONVST, 0x0003ef }, \ > + { AFE440X_LED2CONVEND, 0x0007cf }, \ > + { AFE440X_ALED2CONVST, 0x0007d7 }, \ > + { AFE440X_ALED2CONVEND, 0x000bb7 }, \ > + { AFE440X_LED1CONVST, 0x000bbf }, \ > + { AFE440X_LED1CONVEND, 0x009c3f }, \ > + { AFE440X_ALED1CONVST, 0x000fa7 }, \ > + { AFE440X_ALED1CONVEND, 0x001387 }, \ > + { AFE440X_ADCRSTSTCT0, 0x0003e8 }, \ > + { AFE440X_ADCRSTENDCT0, 0x0003eb }, \ > + { AFE440X_ADCRSTSTCT1, 0x0007d0 }, \ > + { AFE440X_ADCRSTENDCT1, 0x0007d3 }, \ > + { AFE440X_ADCRSTSTCT2, 0x000bb8 }, \ > + { AFE440X_ADCRSTENDCT2, 0x000bbb }, \ > + { AFE440X_ADCRSTSTCT3, 0x000fa0 }, \ > + { AFE440X_ADCRSTENDCT3, 0x000fa3 }, \ > + { AFE440X_PRPCOUNT, 0x009c3f }, \ > + { AFE440X_PDNCYCLESTC, 0x001518 }, \ > + { AFE440X_PDNCYCLEENDC, 0x00991f } > + > +static const struct reg_sequence afe4403_reg_sequences[] = { > + AFE4403_TIMING_PAIRS, > + { AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN | 0x000007}, > + { AFE4403_TIA_AMB_GAIN, AFE4403_TIAGAIN_RES_1_M }, > + { AFE440X_LEDCNTRL, (0x14 << AFE440X_LEDCNTRL_LED1_SHIFT) | > + (0x14 << AFE440X_LEDCNTRL_LED2_SHIFT) }, > + { AFE440X_CONTROL2, AFE440X_CONTROL2_TX_REF_050 << > + AFE440X_CONTROL2_TX_REF_SHIFT }, > +}; > + > +static const struct regmap_range afe4403_yes_ranges[] = { > + regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL), > +}; > + > +static const struct regmap_access_table afe4403_volatile_table = { > + .yes_ranges = afe4403_yes_ranges, > + .n_yes_ranges = ARRAY_SIZE(afe4403_yes_ranges), > +}; > + > +static const struct regmap_config afe4403_regmap_config = { > + .reg_bits = 8, > + .val_bits = 24, > + > + .max_register = AFE440X_PDNCYCLEENDC, > + .cache_type = REGCACHE_RBTREE, > + .volatile_table = &afe4403_volatile_table, > +}; > + > +#ifdef CONFIG_OF > +static const struct of_device_id afe4403_of_match[] = { > + { .compatible = "ti,afe4403", }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(of, afe4403_of_match); > +#endif > + > +static int afe4403_suspend(struct device *dev) > +{ > + struct iio_dev *indio_dev = dev_to_iio_dev(dev); > + struct afe4403_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 afe4403_resume(struct device *dev) > +{ > + struct iio_dev *indio_dev = dev_to_iio_dev(dev); > + struct afe4403_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(afe4403_pm_ops, afe4403_suspend, afe4403_resume); > + > +static int afe4403_probe(struct spi_device *spi) > +{ > + struct iio_dev *indio_dev; > + struct afe4403_data *afe; > + int ret; > + > + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*afe)); > + if (!indio_dev) > + return -ENOMEM; > + > + afe = iio_priv(indio_dev); > + spi_set_drvdata(spi, indio_dev); > + > + afe->dev = &spi->dev; > + afe->spi = spi; > + afe->irq = spi->irq; > + > + afe->regmap = devm_regmap_init_spi(spi, &afe4403_regmap_config); > + if (IS_ERR(afe->regmap)) { > + dev_err(afe->dev, "Unable to allocate register map\n"); > + return PTR_ERR(afe->regmap); > + } > + > + 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"); > + return ret; > + } > + > + ret = regmap_multi_reg_write(afe->regmap, afe4403_reg_sequences, > + ARRAY_SIZE(afe4403_reg_sequences)); > + if (ret) { > + dev_err(afe->dev, "Unable to set register defaults\n"); > + return ret; > + } > + > + indio_dev->modes = INDIO_DIRECT_MODE; > + indio_dev->dev.parent = afe->dev; > + indio_dev->channels = afe4403_channels; > + indio_dev->num_channels = ARRAY_SIZE(afe4403_channels); > + indio_dev->name = AFE4403_DRIVER_NAME; > + indio_dev->info = &afe4403_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"); > + return -ENOMEM; > + } > + > + iio_trigger_set_drvdata(afe->trig, indio_dev); > + > + afe->trig->ops = &afe4403_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"); > + return ret; > + } > + > + ret = devm_request_threaded_irq(afe->dev, afe->irq, > + iio_trigger_generic_data_rdy_poll, > + NULL, IRQF_ONESHOT, > + AFE4403_DRIVER_NAME, > + afe->trig); > + if (ret) { > + dev_err(afe->dev, "Unable to request IRQ\n"); > + return ret; > + } > + } > + > + ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, > + afe4403_trigger_handler, NULL); > + if (ret) { > + dev_err(afe->dev, "Unable to setup buffer\n"); > + return ret; > + } > + > + ret = iio_device_register(indio_dev); > + if (ret) { > + dev_err(afe->dev, "Unable to register IIO device\n"); > + return ret; > + } > + > + return 0; > +} > + > +static int afe4403_remove(struct spi_device *spi) > +{ > + struct iio_dev *indio_dev = spi_get_drvdata(spi); > + struct afe4403_data *afe = iio_priv(indio_dev); > + int ret; > + > + iio_device_unregister(indio_dev); > + > + 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 spi_device_id afe4403_ids[] = { > + { "afe4403", 0 }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(spi, afe4403_ids); > + > +static struct spi_driver afe4403_spi_driver = { > + .driver = { > + .name = AFE4403_DRIVER_NAME, > + .of_match_table = of_match_ptr(afe4403_of_match), > + .pm = &afe4403_pm_ops, > + }, > + .probe = afe4403_probe, > + .remove = afe4403_remove, > + .id_table = afe4403_ids, > +}; > +module_spi_driver(afe4403_spi_driver); > + > +MODULE_AUTHOR("Andrew F. Davis <afd@xxxxxx>"); > +MODULE_DESCRIPTION("TI AFE4403 Heart Rate and Pulse Oximeter"); > +MODULE_LICENSE("GPL v2"); > -- Peter Meerwald-Stadler +43-664-2444418 (mobile) -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
