On 07/12/15 17:26, Andrew F. Davis wrote: > On 12/05/2015 12:21 PM, Jonathan Cameron wrote: >> On 02/12/15 19:57, Andrew F. Davis wrote: >>> Add driver for the TI AFE4404 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. >>> >>> Datasheet: http://www.ti.com/product/AFE4404/datasheet >>> >>> Signed-off-by: Andrew F. Davis <afd@xxxxxx> >> I like this a lot. Seems much simpler to me. >> >> Various bits and bobs inline though. You quite rightly stated there >> was too much to describe in the change log so I've kind of started >> from scratch on the review as well. >> >> Thanks for your hard work on this. >> >> Jonathan Reponses inline. >>> --- >>> .../ABI/testing/sysfs-bus-iio-health-afe4404 | 20 + >>> drivers/iio/Kconfig | 1 + >>> drivers/iio/Makefile | 1 + >>> drivers/iio/health/Kconfig | 25 + >>> drivers/iio/health/Makefile | 6 + >>> drivers/iio/health/afe4404.c | 619 +++++++++++++++++++++ >>> drivers/iio/health/afe440x.h | 168 ++++++ >>> 7 files changed, 840 insertions(+) >>> create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-health-afe4404 >>> create mode 100644 drivers/iio/health/Kconfig >>> create mode 100644 drivers/iio/health/Makefile >>> create mode 100644 drivers/iio/health/afe4404.c >>> create mode 100644 drivers/iio/health/afe440x.h >>> >>> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-health-afe4404 b/Documentation/ABI/testing/sysfs-bus-iio-health-afe4404 >>> new file mode 100644 >>> index 0000000..c104d66 >>> --- /dev/null >>> +++ b/Documentation/ABI/testing/sysfs-bus-iio-health-afe4404 >>> @@ -0,0 +1,20 @@ >>> +What: /sys/bus/iio/devices/iio:deviceX/tia_resistanceY >>> + /sys/bus/iio/devices/iio:deviceX/tia_capacitanceY >>> +Date: December 2015 >>> +KernelVersion: >>> +Contact: Andrew F. Davis <afd@xxxxxx> >>> +Description: >>> + Get and set the resistance and the capacitance settings for the >>> + Transimpedance Amplifier. Y is 1 for Rf1 and Cf1, Y is 2 for >>> + Rf2 and Cf2 values. >>> + Resistance setting is from 0 -> 7 >>> + Capcitance setting is from 0 -> 15 >> No magic numbers if at all possible. These correspond to real resistances >> and capacitances. >> >> You also want an _available attribute for each of them for the different >> possible values. >> >> I'm not overly keep on the naming still but it's part specific enough that >> if you fix the units I'll let it go ;) > > I'm not sure if there is a clean way to do this, these are not channels > so parsing input will need checks based on what kind of register and value > we send in, these are raw input to the registers for other registers, I > changed the name to attempt to make it clear to users these are not > channels but raw registers (out_resistance1_raw -> tia_resistance1). > > I could still make this more clear in the ABI doc: > > Valid capacitance settings are 0 -> 7 which correspond to > 5pF, 2.5pF, 10pF, 7.5pF, 20pF, 17.5pF, 25pF, and 22.5pF > respectively. Just do a simple mapping in the driver from magic number to real value and the other way around + provide the available attribute. Rule 2 of sysfs interfaces: no magic values where a real meaningful one can be provided for the cost of a few more lines of code. You can use the existing floating point to value pair functions from IIO to get you to a couple of values that can be trivially matched against a const table. It's not free, but probably only 20 lines including the static const table of values. > > or something similar. > >>> + >>> +What: /sys/bus/iio/devices/iio:deviceX/tia_separate_en >>> +Date: December 2015 >>> +KernelVersion: >>> +Contact: Andrew F. Davis <afd@xxxxxx> >>> +Description: >>> + Enable or disable separate settings for the TransImpedance >>> + Amplifier above, when disabled both values are set by the >>> + first channel. >> Weird and wonderful but fine for a part specific attibute! >> >> As noted below, I think we need to document all the new ABI even though >> much of it is just extended names on standard channels. >> > > Works for me, I'll add them back. > >>> diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig >>> index 66792e7..ac085ab 100644 >>> --- a/drivers/iio/Kconfig >>> +++ b/drivers/iio/Kconfig >>> @@ -52,6 +52,7 @@ source "drivers/iio/common/Kconfig" >>> source "drivers/iio/dac/Kconfig" >>> source "drivers/iio/frequency/Kconfig" >>> source "drivers/iio/gyro/Kconfig" >>> +source "drivers/iio/health/Kconfig" >>> source "drivers/iio/humidity/Kconfig" >>> source "drivers/iio/imu/Kconfig" >>> source "drivers/iio/light/Kconfig" >>> diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile >>> index aeca726..6c5eb2a 100644 >>> --- a/drivers/iio/Makefile >>> +++ b/drivers/iio/Makefile >>> @@ -18,6 +18,7 @@ obj-y += common/ >>> obj-y += dac/ >>> obj-y += gyro/ >>> obj-y += frequency/ >>> +obj-y += health/ >>> obj-y += humidity/ >>> obj-y += imu/ >>> obj-y += light/ >>> diff --git a/drivers/iio/health/Kconfig b/drivers/iio/health/Kconfig >>> new file mode 100644 >>> index 0000000..526e7af >>> --- /dev/null >>> +++ b/drivers/iio/health/Kconfig >>> @@ -0,0 +1,25 @@ >>> +# >>> +# Health drivers >>> +# >>> +# When adding new entries keep the list in alphabetical order >>> + >>> +menu "Health" >>> + >>> +menu "Heart Rate Monitors" >>> + >>> +config AFE4404 >>> + tristate "TI AFE4404 Heart Rate Monitor" >>> + depends on I2C >>> + select REGMAP_I2C >>> + select IIO_BUFFER >>> + select IIO_TRIGGERED_BUFFER >>> + help >>> + Say yes to choose the Texas Instruments AFE4404 >>> + heart rate monitor and low-cost pulse oximeter. >>> + >>> + To compile this driver as a module, choose M here: the >>> + module will be called afe4404. >>> + >>> +endmenu >>> + >>> +endmenu >>> diff --git a/drivers/iio/health/Makefile b/drivers/iio/health/Makefile >>> new file mode 100644 >>> index 0000000..c108c8d >>> --- /dev/null >>> +++ b/drivers/iio/health/Makefile >>> @@ -0,0 +1,6 @@ >>> +# >>> +# Makefile for IIO Health drivers >>> +# >>> +# When adding new entries keep the list in alphabetical order >>> + >>> +obj-$(CONFIG_AFE4404) += afe4404.o >>> diff --git a/drivers/iio/health/afe4404.c b/drivers/iio/health/afe4404.c >>> new file mode 100644 >>> index 0000000..d36c1d9 >>> --- /dev/null >>> +++ b/drivers/iio/health/afe4404.c >>> @@ -0,0 +1,619 @@ >>> +/* >>> + * AFE4404 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/delay.h> >>> +#include <linux/err.h> >>> +#include <linux/interrupt.h> >>> +#include <linux/i2c.h> >>> +#include <linux/kernel.h> >>> +#include <linux/module.h> >>> +#include <linux/of_gpio.h> >>> +#include <linux/regmap.h> >>> +#include <linux/slab.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 GAIN register fields */ >>> +#define AFE4404_TIA_GAIN_RES_MASK GENMASK(2, 0) >>> +#define AFE4404_TIA_GAIN_RES_SHIFT 0 >>> +#define AFE4404_TIA_GAIN_CAP_MASK GENMASK(5, 3) >>> +#define AFE4404_TIA_GAIN_CAP_SHIFT 3 >>> + >>> +/* AFE4404 LEDCNTRL register fields */ >>> +#define AFE4404_LEDCNTRL_ILED1_MASK GENMASK(5, 0) >>> +#define AFE4404_LEDCNTRL_ILED1_SHIFT 0 >>> +#define AFE4404_LEDCNTRL_ILED2_MASK GENMASK(11, 6) >>> +#define AFE4404_LEDCNTRL_ILED2_SHIFT 6 >>> +#define AFE4404_LEDCNTRL_ILED3_MASK GENMASK(17, 12) >>> +#define AFE4404_LEDCNTRL_ILED3_SHIFT 12 >>> + >>> +/* AFE4404 CONTROL2 register fields */ >>> +#define AFE440X_CONTROL2_ILED_2X_MASK BIT(17) >>> +#define AFE440X_CONTROL2_ILED_2X_SHIFT 17 >>> + >>> +/* AFE4404 CONTROL3 register fields */ >>> +#define AFE440X_CONTROL3_OSC_ENABLE BIT(9) >>> + >>> +/* AFE4404 OFFDAC register current fields */ >>> +#define AFE4404_OFFDAC_CURR_LED1_MASK GENMASK(9, 5) >>> +#define AFE4404_OFFDAC_CURR_LED1_SHIFT 5 >>> +#define AFE4404_OFFDAC_CURR_LED2_MASK GENMASK(19, 15) >>> +#define AFE4404_OFFDAC_CURR_LED2_SHIFT 15 >>> +#define AFE4404_OFFDAC_CURR_LED3_MASK GENMASK(4, 0) >>> +#define AFE4404_OFFDAC_CURR_LED3_SHIFT 0 >>> +#define AFE4404_OFFDAC_CURR_ALED1_MASK GENMASK(14, 10) >>> +#define AFE4404_OFFDAC_CURR_ALED1_SHIFT 10 >>> +#define AFE4404_OFFDAC_CURR_ALED2_MASK GENMASK(4, 0) >>> +#define AFE4404_OFFDAC_CURR_ALED2_SHIFT 0 >>> + >>> +/* AFE4404 NULL fields */ >>> +#define NULL_MASK 0 >>> +#define NULL_SHIFT 0 >>> + >>> +/* AFE4404 TIA_GAIN_CAP values */ >>> +#define AFE4404_TIA_GAIN_CAP_5_P 0x0 >>> +#define AFE4404_TIA_GAIN_CAP_2_5_P 0x1 >>> +#define AFE4404_TIA_GAIN_CAP_10_P 0x2 >>> +#define AFE4404_TIA_GAIN_CAP_7_5_P 0x3 >>> +#define AFE4404_TIA_GAIN_CAP_20_P 0x4 >>> +#define AFE4404_TIA_GAIN_CAP_17_5_P 0x5 >>> +#define AFE4404_TIA_GAIN_CAP_25_P 0x6 >>> +#define AFE4404_TIA_GAIN_CAP_22_5_P 0x7 >>> + >>> +/* AFE4404 TIA_GAIN_RES values */ >>> +#define AFE4404_TIA_GAIN_RES_500_K 0x0 >>> +#define AFE4404_TIA_GAIN_RES_250_K 0x1 >>> +#define AFE4404_TIA_GAIN_RES_100_K 0x2 >>> +#define AFE4404_TIA_GAIN_RES_50_K 0x3 >>> +#define AFE4404_TIA_GAIN_RES_25_K 0x4 >>> +#define AFE4404_TIA_GAIN_RES_10_K 0x5 >>> +#define AFE4404_TIA_GAIN_RES_1_M 0x6 >>> +#define AFE4404_TIA_GAIN_RES_2_M 0x7 >>> + >>> +enum afe4404_chan_id { >>> + LED1, >>> + ALED1, >>> + LED2, >>> + ALED2, >>> + LED3, >>> + LED1_ALED1, >>> + LED2_ALED2, >>> + AVG_LED1_ALED1, >>> + AVG_LED2_ALED2, >>> + ILED1, >>> + ILED2, >>> + ILED3, >>> +}; >>> + >>> +#define AFE4404_REG_INFO(_id, _reg, _offreg, _sm) \ >>> + [_id] = { \ >>> + .reg = _reg, \ >>> + .offreg = _offreg, \ >>> + .shift = _sm ## _SHIFT, \ >>> + .mask = _sm ## _MASK, \ >>> + } >>> + >>> +struct { >>> + unsigned int reg; >>> + unsigned int offreg; >>> + unsigned int shift; >>> + unsigned int mask; >>> +} reg_info[] = { >>> + AFE4404_REG_INFO(LED1, AFE440X_LED1VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_LED1), >>> + AFE4404_REG_INFO(ALED1, AFE440X_ALED1VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_ALED1), >>> + AFE4404_REG_INFO(LED2, AFE440X_LED2VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_LED2), >>> + AFE4404_REG_INFO(ALED2, AFE440X_ALED2VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_ALED2), >>> + AFE4404_REG_INFO(LED3, AFE440X_ALED2VAL, 0, NULL), >>> + AFE4404_REG_INFO(LED1_ALED1, AFE440X_LED1_ALED1VAL, 0, NULL), >>> + AFE4404_REG_INFO(LED2_ALED2, AFE440X_LED2_ALED2VAL, 0, NULL), >>> + AFE4404_REG_INFO(AVG_LED1_ALED1, AFE4404_AVG_LED1_ALED1VAL, 0, NULL), >>> + AFE4404_REG_INFO(AVG_LED2_ALED2, AFE4404_AVG_LED2_ALED2VAL, 0, NULL), >>> + AFE4404_REG_INFO(ILED1, AFE440X_LEDCNTRL, 0, AFE4404_LEDCNTRL_ILED1), >>> + AFE4404_REG_INFO(ILED2, AFE440X_LEDCNTRL, 0, AFE4404_LEDCNTRL_ILED2), >>> + AFE4404_REG_INFO(ILED3, AFE440X_LEDCNTRL, 0, AFE4404_LEDCNTRL_ILED3), >>> +}; >>> + >>> +static const struct iio_chan_spec afe4404_channels[] = { >>> + /* ADC values */ >>> + AFE440X_INTENSITY_CHAN(LED1, "led1", BIT(IIO_CHAN_INFO_OFFSET)), >>> + AFE440X_INTENSITY_CHAN(ALED1, "led1_ambient", BIT(IIO_CHAN_INFO_OFFSET)), >> (this one is still 'interesting' as it's nothing to do with led1 other than it's >> taken temporily close to it - the led is presumably off at the time! - I can't >> think of a better way though - maybe another reviewer will) >>> + AFE440X_INTENSITY_CHAN(LED2, "led2", BIT(IIO_CHAN_INFO_OFFSET)), >>> + AFE440X_INTENSITY_CHAN(ALED2, "led2_ambient", BIT(IIO_CHAN_INFO_OFFSET)), >>> + AFE440X_INTENSITY_CHAN(LED3, "led3", BIT(IIO_CHAN_INFO_OFFSET)), >>> + AFE440X_INTENSITY_CHAN(LED1_ALED1, "led1-led1_ambient", 0), >>> + AFE440X_INTENSITY_CHAN(LED2_ALED2, "led2-led2_ambient", 0), >> This trick for the differential cases is a cludge to work around deficiencies >> in our existing infrastructure, but it's straight forward one for an unusual >> case so fair enough. >> >>> + AFE440X_INTENSITY_CHAN(AVG_LED1_ALED1, "led1-led1_ambient_mean", 0), >>> + AFE440X_INTENSITY_CHAN(AVG_LED2_ALED2, "led2-led2_ambient_mean", 0), >> I'd love to better describe these two with the filters made explicit as >> separate sysfs attributes rather than here. It's kind of backwards but >> we do have oversampling to define what is happening here. I also note >> that the true output rate of this is lower than the other channels. >> >> If we were to propose a decimation to match with oversampling and to >> explicitly document them as a pair it might work. Which is relevant >> for a channel is dependent on the 'natural - e.g. the trigger rate' >> at which we fill the buffer. So if the whole device is performing >> decimation and we read at the reduced frequency then it is oversampling >> - if we read at the original frequency it is decimation. >> >> What do you think? > > I'm thinking these last two are kind of a mess right now, also I don't > expose the setting to enable these yet anyway, so, I think I will just > drop them and add them back in a latter patch that adds all their > required functionality together. Fair enough. > >>> + /* LED current */ >>> + AFE440X_CURRENT_CHAN(ILED1, "led1"), >>> + AFE440X_CURRENT_CHAN(ILED2, "led2"), >>> + AFE440X_CURRENT_CHAN(ILED3, "led3"), >> >> Whilst all these now just 'stretch' :) the current ABI structure they >> do need explicitly documenting somewhere. Probably odd enough that they'll >> want to go in your part specific doc rather than just adding the specific >> naming to the existing abi. >> > > ACK > >>> +}; >>> + >>> +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 afe440x_data *afe440x = iio_device_get_drvdata(indio_dev); >>> + struct afe440x_reg *afe440x_reg = to_afe440x_reg(attr); >>> + unsigned int reg_val; >>> + int ret; >>> + >>> + ret = regmap_read(afe440x->regmap, afe440x_reg->reg, ®_val); >>> + if (ret) >>> + return ret; >>> + >>> + reg_val >>= afe440x_reg->shift; >>> + reg_val &= afe440x_reg->mask; >>> + >>> + return scnprintf(buf, PAGE_SIZE, "%u\n", reg_val); >>> +} >>> + >>> +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 afe440x_data *afe440x = iio_device_get_drvdata(indio_dev); >>> + struct afe440x_reg *afe440x_reg = to_afe440x_reg(attr); >>> + unsigned int reg_val; >>> + int val, ret; >>> + >>> + if (kstrtoint(buf, 0, &val)) >>> + return -EINVAL; >>> + >>> + ret = regmap_read(afe440x->regmap, afe440x_reg->reg, ®_val); >>> + if (ret) >>> + return ret; >>> + >>> + reg_val &= ~afe440x_reg->mask; >>> + reg_val |= ((val << afe440x_reg->shift) & afe440x_reg->mask); >>> + >>> + ret = regmap_write(afe440x->regmap, afe440x_reg->reg, reg_val); >>> + if (ret) >>> + return ret; >>> + >>> + return count; >>> +} >>> + >>> +AFE440X_ATTR(tia_separate_en, AFE4404_TIA_GAIN_SEP, AFE440X_TIAGAIN_ENSEPGAIN); >>> + >>> +AFE440X_ATTR(tia_resistance1, AFE4404_TIA_GAIN, AFE4404_TIA_GAIN_RES); >>> +AFE440X_ATTR(tia_capacitance1, AFE4404_TIA_GAIN, AFE4404_TIA_GAIN_CAP); >>> + >>> +AFE440X_ATTR(tia_resistance2, AFE4404_TIA_GAIN_SEP, AFE4404_TIA_GAIN_RES); >>> +AFE440X_ATTR(tia_capacitance2, AFE4404_TIA_GAIN_SEP, AFE4404_TIA_GAIN_CAP); >>> + >>> +static struct attribute *afe4404_attributes[] = { >>> + &afe440x_reg_tia_separate_en.dev_attr.attr, >>> + &afe440x_reg_tia_resistance1.dev_attr.attr, >>> + &afe440x_reg_tia_capacitance1.dev_attr.attr, >>> + &afe440x_reg_tia_resistance2.dev_attr.attr, >>> + &afe440x_reg_tia_capacitance2.dev_attr.attr, >>> + NULL >>> +}; >>> + >>> +static const struct attribute_group afe4404_attribute_group = { >>> + .attrs = afe4404_attributes >>> +}; >>> + >>> +static int afe440x_read_raw(struct iio_dev *indio_dev, >>> + struct iio_chan_spec const *chan, >>> + int *val, int *val2, long mask) >>> +{ >>> + struct afe440x_data *afe440x = iio_device_get_drvdata(indio_dev); >>> + int ret; >>> + >>> + switch (chan->type) { >>> + case IIO_INTENSITY: >>> + switch (mask) { >>> + case IIO_CHAN_INFO_RAW: >>> + ret = regmap_read(afe440x->regmap, >>> + reg_info[chan->address].reg, val); >>> + if (ret) >>> + return ret; >>> + return IIO_VAL_INT; >>> + case IIO_CHAN_INFO_OFFSET: >>> + ret = regmap_read(afe440x->regmap, >>> + reg_info[chan->address].offreg, val); >>> + if (ret) >>> + return ret; >>> + *val &= reg_info[chan->address].mask; >>> + *val >>= reg_info[chan->address].shift; >>> + return IIO_VAL_INT; >>> + } >>> + break; >>> + case IIO_CURRENT: >>> + switch (mask) { >>> + case IIO_CHAN_INFO_RAW: >>> + ret = regmap_read(afe440x->regmap, >>> + reg_info[chan->address].reg, val); >>> + if (ret) >>> + return ret; >>> + *val &= reg_info[chan->address].mask; >>> + *val >>= reg_info[chan->address].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 afe440x_write_raw(struct iio_dev *indio_dev, >>> + struct iio_chan_spec const *chan, >>> + int val, int val2, long mask) >>> +{ >>> + struct afe440x_data *afe440x = iio_device_get_drvdata(indio_dev); >>> + unsigned int reg_val; >>> + int ret; >>> + >>> + switch (chan->type) { >>> + case IIO_INTENSITY: >>> + switch (mask) { >>> + case IIO_CHAN_INFO_OFFSET: >>> + ret = regmap_read(afe440x->regmap, >>> + reg_info[chan->address].offreg, >>> + ®_val); >>> + if (ret) >>> + return ret; >>> + reg_val &= ~reg_info[chan->address].mask; >>> + reg_val |= ((val << reg_info[chan->address].shift) & >>> + reg_info[chan->address].mask); >>> + return regmap_write(afe440x->regmap, >>> + reg_info[chan->address].offreg, >>> + reg_val); >>> + } >>> + break; >>> + case IIO_CURRENT: >>> + switch (mask) { >>> + case IIO_CHAN_INFO_RAW: >>> + ret = regmap_read(afe440x->regmap, >>> + reg_info[chan->address].reg, >>> + ®_val); >>> + if (ret) >>> + return ret; >>> + reg_val &= ~reg_info[chan->address].mask; >>> + reg_val |= ((val << reg_info[chan->address].shift) & >>> + reg_info[chan->address].mask); >>> + return regmap_write(afe440x->regmap, >>> + reg_info[chan->address].reg, >>> + reg_val); >>> + } >>> + break; >>> + default: >>> + break; >>> + } >>> + >>> + return -EINVAL; >>> +} >>> + >>> +static const struct iio_info afe4404_iio_info = { >>> + .attrs = &afe4404_attribute_group, >>> + .read_raw = afe440x_read_raw, >>> + .write_raw = afe440x_write_raw, >>> + .driver_module = THIS_MODULE, >>> +}; >>> + >>> +static irqreturn_t afe440x_trigger_handler(int irq, void *private) >>> +{ >>> + struct iio_poll_func *pf = private; >>> + struct iio_dev *indio_dev = pf->indio_dev; >>> + struct afe440x_data *afe440x = iio_device_get_drvdata(indio_dev); >>> + int ret, bit, reg, i = 0; >>> + s32 buffer[12]; >>> + >>> + for_each_set_bit(bit, indio_dev->active_scan_mask, >>> + indio_dev->masklength) { >>> + reg = reg_info[bit].reg; >> why the local reg variable? Stick it dirrectly in the functional call. > > No reason, just looked better to me. Will fix. > >>> + ret = regmap_read(afe440x->regmap, reg, &buffer[i++]); >>> + 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 afe440x_trigger_ops = { >>> + .owner = THIS_MODULE, >>> +}; >>> + >>> +/* 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, AFE4404_TIA_GAIN_RES_50_K }, >>> + { AFE440X_LEDCNTRL, (0xf << AFE4404_LEDCNTRL_ILED1_SHIFT) | >>> + (0x3 << AFE4404_LEDCNTRL_ILED2_SHIFT) | >>> + (0x3 << AFE4404_LEDCNTRL_ILED3_SHIFT) }, >>> + { AFE440X_CONTROL2, AFE440X_CONTROL3_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, >>> +}; >>> + >>> +#ifdef CONFIG_OF >>> +static const struct of_device_id afe4404_of_match[] = { >>> + { .compatible = "ti,afe4404", }, >>> + { /* sentinel */ }, >>> +}; >>> +MODULE_DEVICE_TABLE(of, afe4404_of_match); >>> +#endif >>> + >>> +static int afe440x_suspend(struct device *dev) >>> +{ >>> + struct afe440x_data *afe440x = dev_get_drvdata(dev); >>> + int ret; >>> + >>> + ret = regmap_update_bits(afe440x->regmap, AFE440X_CONTROL2, >>> + AFE440X_CONTROL2_PDN_AFE, >>> + AFE440X_CONTROL2_PDN_AFE); >>> + if (ret) >>> + return ret; >>> + >>> + ret = regulator_disable(afe440x->regulator); >>> + if (ret) { >>> + dev_err(dev, "Failed to disable regulator\n"); >>> + return ret; >>> + } >> Some of the static code checkers (probably coccicheck) will >> point out that moving the return ret out of the above brackets >> will have the same effect as you have here in less code. >> >> It's worth running sparse, smatch and coccicheck on drivers before >> submitting as otherwise we miss things and then get a series >> of 'fix' patches after this hits a public tree rather than the list >> (you sometimes get them for posting on the list as well these days!) > > Makes sense, will do. > >>> + >>> + return 0; >>> +} >>> + >>> +static int afe440x_resume(struct device *dev) >>> +{ >>> + struct afe440x_data *afe440x = dev_get_drvdata(dev); >>> + int ret; >>> + >>> + ret = regmap_update_bits(afe440x->regmap, AFE440X_CONTROL2, >>> + AFE440X_CONTROL2_PDN_AFE, 0); >>> + if (ret) >>> + return ret; >> I'd expect you want to turn the device off on remove given you turn >> it on during a resume... >>> + >>> + ret = regulator_enable(afe440x->regulator); >>> + if (ret) { >>> + dev_err(dev, "Failed to enable regulator\n"); >>> + return ret; >>> + } >> You turn the reg on here, but nowhere else that I can see. >> Why should it be on during the initial start? > > I'm not sure but I belive the regulator will be enabled on 'get' It won't - has to be explicity enabled. Now as likely as not on most boards it will be on anyway, but you never know! > and when all devices using the regulator have 'put' it will be > turned off. Not true either. Will leave it on unless explicitly disabled. >I manualy disable/enable in the PM code so I don't > have to put/get them agian. > >>> + >>> + return 0; >>> +} >>> + >>> +SIMPLE_DEV_PM_OPS(afe440x_pm_ops, afe440x_suspend, afe440x_resume); >>> + >>> +static int afe440x_iio_setup(struct afe440x_data *afe440x) >>> +{ >>> + struct iio_dev *indio_dev; >>> + int ret; >>> + >>> + indio_dev = devm_iio_device_alloc(afe440x->dev, 0); >>> + if (!indio_dev) { >>> + dev_err(afe440x->dev, "Unable to allocate IIO device\n"); >>> + return -ENOMEM; >>> + } >>> + >>> + iio_device_set_drvdata(indio_dev, afe440x); >>> + >>> + indio_dev->modes = INDIO_DIRECT_MODE; >>> + indio_dev->dev.parent = afe440x->dev; >>> + indio_dev->channels = afe440x->channels; >>> + indio_dev->num_channels = afe440x->num_channels; >>> + indio_dev->name = afe440x->name; >>> + indio_dev->info = afe440x->info; >>> + >>> + if (afe440x->irq > 0) { >>> + afe440x->trig = devm_iio_trigger_alloc(afe440x->dev, >>> + "%s-dev%d", >>> + indio_dev->name, >>> + indio_dev->id); >>> + if (!afe440x->trig) { >>> + dev_err(afe440x->dev, "Unable to allocate IIO trigger\n"); >>> + return -ENOMEM; >>> + } >>> + >>> + iio_trigger_set_drvdata(afe440x->trig, indio_dev); >>> + >>> + afe440x->trig->ops = &afe440x_trigger_ops; >>> + afe440x->trig->dev.parent = afe440x->dev; >>> + >>> + ret = iio_trigger_register(afe440x->trig); >>> + if (ret) { >>> + dev_err(afe440x->dev, "Unable to register IIO trigger\n"); >>> + return ret; >>> + } >>> + >>> + ret = devm_request_threaded_irq(afe440x->dev, afe440x->irq, >>> + iio_trigger_generic_data_rdy_poll, >>> + NULL, IRQF_ONESHOT, >>> + afe440x->name, afe440x->trig); >>> + if (ret) { >>> + dev_err(afe440x->dev, "Unable to request IRQ\n"); >>> + return ret; >>> + } >>> + } >>> + >>> + ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, >>> + &afe440x_trigger_handler, NULL); >>> + if (ret) { >>> + dev_err(afe440x->dev, "Unable to setup buffer\n"); >>> + return ret; >>> + } >>> + >>> + ret = devm_iio_device_register(afe440x->dev, indio_dev); >> This suprises me a little - I'd expect such a complex part to >> do at least some power saving or similar... >> >> If that is the case you'll want to do that in the remove after the device >> is unregistered (to avoid a race with userspace interfaces still available). >> >> Can always be added in a later patch however! > > Why do today what you can put off until tomorrow :) I'll look into that > in a later patch. > >>> + if (ret) { >>> + dev_err(afe440x->dev, "Unable to register IIO device\n"); >>> + return ret; >>> + } >>> + >>> + return 0; >>> +} >>> + >>> +static int afe4404_probe(struct i2c_client *client, >>> + const struct i2c_device_id *id) >>> +{ >>> + struct afe440x_data *afe440x; >>> + int ret; >>> + >>> + afe440x = devm_kzalloc(&client->dev, sizeof(*afe440x), GFP_KERNEL); >>> + if (!afe440x) >>> + return -ENOMEM; >> This is all still backwards to my mind and could be easily refactored >> to provide the device specific stuff in a similar way to other IIO drivers >> do it with a mixture of const data and appropriate callbacks. >> >> I appreciate I haven't seen the other driver you mentioned shares a lot >> of the code, but I doubt it does anything that couldn't be handled that >> way around. > > I'm thinking now that this driver may be getting close to correct, I will > add the other part as part of this series if that is OK. Should clear up > some of the issues below to have them at the same time. Cool > >>> + >>> + i2c_set_clientdata(client, afe440x); >>> + >>> + afe440x->dev = &client->dev; >>> + afe440x->irq = client->irq; >>> + >>> + afe440x->regmap = devm_regmap_init_i2c(client, &afe4404_regmap_config); >>> + if (IS_ERR(afe440x->regmap)) { >>> + dev_err(afe440x->dev, "Unable to allocate register map\n"); >>> + return PTR_ERR(afe440x->regmap); >>> + } >>> + >>> + afe440x->regulator = devm_regulator_get(afe440x->dev, "tx_sup"); >>> + if (IS_ERR(afe440x->regulator)) { >>> + dev_err(afe440x->dev, "Unable to get regulator\n"); >>> + return PTR_ERR(afe440x->regulator); >>> + } >> Given you turn the reg on during the resume, I'm guessing you want to turn >> it on here and off in remove? No reason to assume it is on when the >> board is powered up! >> >>> + >>> + ret = regmap_write(afe440x->regmap, AFE440X_CONTROL0, >>> + AFE440X_CONTROL0_SW_RESET); >>> + if (ret) { >>> + dev_err(afe440x->dev, "Unable to reset device\n"); >>> + return ret; >>> + } >>> + >>> + ret = regmap_register_patch(afe440x->regmap, afe4404_reg_sequences, >>> + ARRAY_SIZE(afe4404_reg_sequences)); >>> + if (ret) { >>> + dev_err(afe440x->dev, "Unable to set register defaults\n"); >>> + return ret; >>> + } >>> + >> As I suggest below in the header, I'd put these elements >> into a separate structure (as they are constant for a given part) > > ACK > >>> + afe440x->channels = afe4404_channels; >>> + afe440x->num_channels = ARRAY_SIZE(afe4404_channels); >>> + afe440x->name = AFE4404_DRIVER_NAME; >>> + afe440x->info = &afe4404_iio_info; >>> + >>> + return afe440x_iio_setup(afe440x); >>> +} >>> + >>> +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 = of_match_ptr(afe4404_of_match), >>> + .pm = &afe440x_pm_ops, >>> + }, >>> + .probe = afe4404_probe, >>> + .id_table = afe4404_ids, >>> +}; >>> +module_i2c_driver(afe4404_i2c_driver); >>> + >>> +MODULE_AUTHOR("Andrew F. Davis <afd@xxxxxx>"); >>> +MODULE_DESCRIPTION("TI AFE4404 Heart Rate and Pulse Oximeter"); >>> +MODULE_LICENSE("GPL"); >>> diff --git a/drivers/iio/health/afe440x.h b/drivers/iio/health/afe440x.h >>> new file mode 100644 >>> index 0000000..73a2577 >>> --- /dev/null >>> +++ b/drivers/iio/health/afe440x.h >>> @@ -0,0 +1,168 @@ >>> +/* >>> + * AFE440X Heart Rate Monitors and Low-Cost Pulse Oximeters >>> + * >>> + * Author: Andrew F. Davis <afd@xxxxxx> >>> + * >>> + * Copyright: (C) 2015 Texas Instruments, Inc. >>> + * >>> + * 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. >>> + */ >>> + >>> +#ifndef _AFE440X_H >>> +#define _AFE440X_H >> I know you are aiming to support more devices and hence the header file >> spit may make sense, but please squish it into the .c file for now and >> pull it out as part of the series adding the new devices - avoids >> me getting patches 'tidying this up' in the interval before the other >> device support makes it. > > As above would it be better for me to push both now? Probably, easier to look at whether any refactoring make sense with both infront of us. > >>> + >>> +/* AFE440X registers */ >>> +#define AFE440X_CONTROL0 0x00 >>> +#define AFE440X_LED2STC 0x01 >>> +#define AFE440X_LED2ENDC 0x02 >>> +#define AFE440X_LED1LEDSTC 0x03 >>> +#define AFE440X_LED1LEDENDC 0x04 >>> +#define AFE440X_ALED2STC 0x05 >>> +#define AFE440X_ALED2ENDC 0x06 >>> +#define AFE440X_LED1STC 0x07 >>> +#define AFE440X_LED1ENDC 0x08 >>> +#define AFE440X_LED2LEDSTC 0x09 >>> +#define AFE440X_LED2LEDENDC 0x0a >>> +#define AFE440X_ALED1STC 0x0b >>> +#define AFE440X_ALED1ENDC 0x0c >>> +#define AFE440X_LED2CONVST 0x0d >>> +#define AFE440X_LED2CONVEND 0x0e >>> +#define AFE440X_ALED2CONVST 0x0f >>> +#define AFE440X_ALED2CONVEND 0x10 >>> +#define AFE440X_LED1CONVST 0x11 >>> +#define AFE440X_LED1CONVEND 0x12 >>> +#define AFE440X_ALED1CONVST 0x13 >>> +#define AFE440X_ALED1CONVEND 0x14 >>> +#define AFE440X_ADCRSTSTCT0 0x15 >>> +#define AFE440X_ADCRSTENDCT0 0x16 >>> +#define AFE440X_ADCRSTSTCT1 0x17 >>> +#define AFE440X_ADCRSTENDCT1 0x18 >>> +#define AFE440X_ADCRSTSTCT2 0x19 >>> +#define AFE440X_ADCRSTENDCT2 0x1a >>> +#define AFE440X_ADCRSTSTCT3 0x1b >>> +#define AFE440X_ADCRSTENDCT3 0x1c >>> +#define AFE440X_PRPCOUNT 0x1d >>> +#define AFE440X_CONTROL1 0x1e >>> +#define AFE440X_TIAGAIN 0x20 >>> +#define AFE440X_TIA_AMB_GAIN 0x21 >>> +#define AFE440X_LEDCNTRL 0x22 >>> +#define AFE440X_CONTROL2 0x23 >>> +#define AFE440X_ALARM 0x29 >>> +#define AFE440X_LED2VAL 0x2a >>> +#define AFE440X_ALED2VAL 0x2b >>> +#define AFE440X_LED1VAL 0x2c >>> +#define AFE440X_ALED1VAL 0x2d >>> +#define AFE440X_LED2_ALED2VAL 0x2e >>> +#define AFE440X_LED1_ALED1VAL 0x2f >>> +#define AFE440X_CONTROL3 0x31 >>> +#define AFE440X_PDNCYCLESTC 0x32 >>> +#define AFE440X_PDNCYCLEENDC 0x33 >>> + >>> +/* CONTROL0 register fields */ >>> +#define AFE440X_CONTROL0_REG_READ BIT(0) >>> +#define AFE440X_CONTROL0_TM_COUNT_RST BIT(1) >>> +#define AFE440X_CONTROL0_SW_RESET BIT(3) >>> + >>> +/* CONTROL1 register fields */ >>> +#define AFE440X_CONTROL1_TIMEREN BIT(8) >>> + >>> +/* TIAGAIN register fields */ >>> +#define AFE440X_TIAGAIN_ENSEPGAIN_MASK BIT(15) >>> +#define AFE440X_TIAGAIN_ENSEPGAIN_SHIFT 15 >>> + >>> +/* CONTROL2 register fields */ >>> +#define AFE440X_CONTROL2_PDN_AFE BIT(0) >>> +#define AFE440X_CONTROL2_PDN_RX BIT(1) >>> +#define AFE440X_CONTROL2_DYNAMIC4 BIT(3) >>> +#define AFE440X_CONTROL2_DYNAMIC3 BIT(4) >>> +#define AFE440X_CONTROL2_DYNAMIC2 BIT(14) >>> +#define AFE440X_CONTROL2_DYNAMIC1 BIT(20) >>> + >>> +/* CONTROL3 register fields */ >>> +#define AFE440X_CONTROL3_CLKDIV GENMASK(2, 0) >>> + >>> +/* CONTROL0 values */ >>> +#define AFE440X_CONTROL0_WRITE 0x0 >>> +#define AFE440X_CONTROL0_READ 0x1 >>> + >>> +#define AFE440X_INTENSITY_CHAN(_index, _name, _mask) \ >>> + { \ >>> + .type = IIO_INTENSITY, \ >>> + .channel = _index, \ >>> + .address = _index, \ >>> + .scan_index = _index, \ >>> + .scan_type = { \ >>> + .sign = 's', \ >>> + .realbits = 24, \ >>> + .storagebits = 32, \ >>> + .endianness = IIO_CPU, \ >>> + }, \ >>> + .extend_name = _name, \ >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ >>> + _mask, \ >>> + } >>> + >>> +#define AFE440X_CURRENT_CHAN(_index, _name) \ >>> + { \ >>> + .type = IIO_CURRENT, \ >>> + .channel = _index, \ >>> + .address = _index, \ >>> + .scan_index = _index, \ >>> + .extend_name = _name, \ >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ >>> + BIT(IIO_CHAN_INFO_SCALE), \ >>> + .output = true, \ >>> + } >> I'd particularly like to see the above two definitions next to the >> arrays they are used to instantiate - makes for easier review! >> >>> + >>> +struct afe440x_reg { >>> + struct device_attribute dev_attr; >>> + unsigned int reg; >>> + unsigned int shift; >>> + unsigned int mask; >>> +}; >>> + >>> +#define to_afe440x_reg(_dev_attr) \ >>> + container_of(_dev_attr, struct afe440x_reg, dev_attr) >>> + >>> +#define AFE440X_ATTR(_name, _reg, _field) \ >>> + struct afe440x_reg afe440x_reg_##_name = { \ >>> + .dev_attr = __ATTR(_name, (S_IRUGO | S_IWUSR), \ >>> + afe440x_show_register, \ >>> + afe440x_store_register), \ >>> + .reg = _reg, \ >>> + .shift = _field ## _SHIFT, \ >>> + .mask = _field ## _MASK, \ >>> + } >> For now I'd like to see this in the .c file >>> + >>> +/** >>> + * struct afe440x_data >>> + * @dev - Device structure >>> + * @name - Device name >> You still have a few bits in here that are presumably there >> to assist supporting multiple drivers. I don't think they >> belong in this structure. >> >> Split them out to say >> struct afe440x_device_info and pass that into your iio_setup >> function as well. Then they won't be in this struct for it's >> other uses which would be cleaner (at the cost of one extra >> parameter to that function call) >> >> It will also split out thsoe parts that are constant for a given >> type of device from those that are instance specific >> (such as Irq's etc). >> > > ACK > >>> + * @regmap - Register map of the device >>> + * @regulator - Pointer to the regulator for the IC >>> + * @channels - IIO channels >>> + * @num_channels - Number of IIO channels >>> + * @info - IIO info for device >>> + * @trig - IIO trigger for this device >>> + * @irq - ADC_RDY line interrupt number >>> +**/ >> Nicely documented - thanks. >>> +struct afe440x_data { >>> + struct device *dev; >>> + const char *name; >>> + struct regmap *regmap; >>> + struct regulator *regulator; >>> + struct iio_chan_spec const *channels; >>> + int num_channels; >>> + const struct iio_info *info; >>> + struct iio_trigger *trig; >>> + int irq; >>> +}; >>> + >>> +#endif /* _AFE440X_H */ >>> >> > -- > To unsubscribe from this list: send the line "unsubscribe linux-iio" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- 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
