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Message-ID: <1F3AC3675D538145B1661F571FE1805F199FDE3C@irsmsx105.ger.corp.intel.com>
Date: Sun, 11 Jan 2015 15:10:42 +0000
From: "Tirdea, Irina" <irina.tirdea@...el.com>
To: Jonathan Cameron <jic23@...nel.org>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Dogaru, Vlad" <vlad.dogaru@...el.com>,
"Baluta, Daniel" <daniel.baluta@...el.com>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald <pmeerw@...erw.net>
Subject: RE: [PATCH 8/8] iio: add driver for Freescale MMA9553
> -----Original Message-----
> From: Jonathan Cameron [mailto:jic23@...nel.org]
> Sent: 01 January, 2015 13:58
> To: Tirdea, Irina; linux-iio@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org; Dogaru, Vlad; Baluta, Daniel; Hartmut Knaack; Lars-Peter Clausen; Peter Meerwald
> Subject: Re: [PATCH 8/8] iio: add driver for Freescale MMA9553
>
> On 19/12/14 22:57, Irina Tirdea wrote:
> > Add support for Freescale MMA9553L Intelligent Pedometer Platform.
> >
> > The following functionalities are supported:
> > - step counter (counts the number of steps using a HW register)
> > - step detector (generates an iio event at every step the user takes)
> > - activity recognition (rest, walking, jogging, running)
> > - speed
> > - calories
> > - distance
> >
> > To get accurate pedometer results, the user's height, weight and gender
> > need to be configured.
> >
> > The specifications can be downloaded from:
> > http://www.freescale.com/files/sensors/doc/ref_manual/MMA955xLSWRM.pdf
> > http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf
> >
> > Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
> A few bits an bobs beyond the interface discussions in the earlier patches
> in the series.
>
> A nice looking driver on the whole, for a complex little device ;)
Thanks for the detailed review, Jonathan!
>
> Jonathan
> > ---
> > drivers/iio/accel/Kconfig | 12 +-
> > drivers/iio/accel/Makefile | 1 +
> > drivers/iio/accel/mma9551_core.c | 88 +++
> > drivers/iio/accel/mma9551_core.h | 17 +-
> > drivers/iio/accel/mma9553.c | 1239 ++++++++++++++++++++++++++++++++++++++
> > 5 files changed, 1355 insertions(+), 2 deletions(-)
> > create mode 100644 drivers/iio/accel/mma9553.c
> >
> > diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> > index 0600798..afd50d0 100644
> > --- a/drivers/iio/accel/Kconfig
> > +++ b/drivers/iio/accel/Kconfig
> > @@ -107,7 +107,7 @@ config KXCJK1013
> >
> > config MMA9551_CORE
> > tristate
> > - depends on MMA9551
> > + depends on MMA9551 || MMA9553
> >
> > config MMA9551
> > tristate "Freescale MMA9551L Intelligent Motion-Sensing Platform Driver"
> > @@ -121,4 +121,14 @@ config MMA9551
> > To compile this driver as a module, choose M here: the module
> > will be called mma9551.
> >
> > +config MMA9553
> > + tristate "Freescale MMA9553L Intelligent Pedometer Platform Driver"
> > + depends on I2C
> > + select MMA9551_CORE
> > + help
> > + Say yes here to build support for the Freescale MMA9553L
> > + Intelligent Pedometer Platform Driver.
> > +
> > + To compile this driver as a module, choose M here: the module
> > + will be called mma9553.
> > endmenu
> > diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> > index 8105316..f815695 100644
> > --- a/drivers/iio/accel/Makefile
> > +++ b/drivers/iio/accel/Makefile
> > @@ -12,6 +12,7 @@ obj-$(CONFIG_MMA8452) += mma8452.o
> >
> > obj-$(CONFIG_MMA9551_CORE) += mma9551_core.o
> > obj-$(CONFIG_MMA9551) += mma9551.o
> > +obj-$(CONFIG_MMA9553) += mma9553.o
> >
> > obj-$(CONFIG_IIO_ST_ACCEL_3AXIS) += st_accel.o
> > st_accel-y := st_accel_core.o
> > diff --git a/drivers/iio/accel/mma9551_core.c b/drivers/iio/accel/mma9551_core.c
> > index cab481b..743a868 100644
> > --- a/drivers/iio/accel/mma9551_core.c
> > +++ b/drivers/iio/accel/mma9551_core.c
> > @@ -53,6 +53,11 @@
> > #define MMA9551_AFE_Y_ACCEL_REG 0x02
> > #define MMA9551_AFE_Z_ACCEL_REG 0x04
> >
> > +/* Reset/Suspend/Clear application */
> > +#define MMA9551_RSC_RESET 0x00
> > +#define MMA9551_RSC_OFFSET(mask) (3 - (ffs(mask) - 1) / 8)
> > +#define MMA9551_RSC_VAL(mask) (mask >> (((ffs(mask) - 1) / 8) * 8))
> > +
> > /*
> > * A response is composed of:
> > * - control registers: MB0-3
> > @@ -215,6 +220,30 @@ int mma9551_read_status_byte(struct i2c_client *client, u8 app_id,
> > }
> > EXPORT_SYMBOL(mma9551_read_status_byte);
> >
> > +int mma9551_read_config_word(struct i2c_client *client, u8 app_id,
> > + u16 reg, u16 *val)
> > +{
> > + int ret;
> > + __be16 v;
> > +
> > + ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
> > + reg, NULL, 0, (u8 *)&v, 2);
> > + *val = be16_to_cpu(v);
> > +
> > + return ret;
> > +}
> > +EXPORT_SYMBOL(mma9551_read_config_word);
> > +
> > +int mma9551_write_config_word(struct i2c_client *client, u8 app_id,
> > + u16 reg, u16 val)
> > +{
> > + __be16 v = cpu_to_be16(val);
> > +
> > + return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg,
> > + (u8 *) &v, 2, NULL, 0);
> > +}
> > +EXPORT_SYMBOL(mma9551_write_config_word);
> > +
> > int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
> > u16 reg, u16 *val)
> > {
> > @@ -229,6 +258,56 @@ int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
> > }
> > EXPORT_SYMBOL(mma9551_read_status_word);
> >
> > +int mma9551_read_config_words(struct i2c_client *client, u8 app_id,
> > + u16 reg, u8 len, u16 *buf)
> > +{
> > + int ret, i;
> > + int len_words = len / sizeof(u16);
> > + __be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS];
> > +
> > + ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
> > + reg, NULL, 0, (u8 *) be_buf, len);
> > + if (ret < 0)
> > + return ret;
> > +
> > + for (i = 0; i < len_words; i++)
> > + buf[i] = be16_to_cpu(be_buf[i]);
> blank line
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(mma9551_read_config_words);
> > +
> > +int mma9551_read_status_words(struct i2c_client *client, u8 app_id,
> > + u16 reg, u8 len, u16 *buf)
> > +{
> > + int ret, i;
> > + int len_words = len / sizeof(u16);
> > + __be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS];
> > +
> > + ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
> > + reg, NULL, 0, (u8 *) be_buf, len);
> > + if (ret < 0)
> > + return ret;
> > +
> > + for (i = 0; i < len_words; i++)
> > + buf[i] = be16_to_cpu(be_buf[i]);
> blank line
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(mma9551_read_status_words);
> > +
> > +int mma9551_write_config_words(struct i2c_client *client, u8 app_id,
> > + u16 reg, u8 len, u16 *buf)
> > +{
> > + int i;
> > + int len_words = len / sizeof(u16);
> > + __be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS];
> > +
> > + for (i = 0; i < len_words; i++)
> > + be_buf[i] = cpu_to_be16(buf[i]);
> blank line.
> > + return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG,
> > + reg, (u8 *) be_buf, len, NULL, 0);
> > +}
> > +EXPORT_SYMBOL(mma9551_write_config_words);
> > +
> > int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
> > u16 reg, u8 mask, u8 val)
> > {
> > @@ -437,6 +516,15 @@ int mma9551_read_accel_scale(int *val, int *val2)
> > }
> > EXPORT_SYMBOL(mma9551_read_accel_scale);
> >
> > +int mma9551_app_reset(struct i2c_client *client, u32 app_mask)
> > +{
> > + return mma9551_write_config_byte(client, MMA9551_APPID_RCS,
> > + MMA9551_RSC_RESET +
> > + MMA9551_RSC_OFFSET(app_mask),
> > + MMA9551_RSC_VAL(app_mask));
> > +}
> > +EXPORT_SYMBOL(mma9551_app_reset);
> > +
> > MODULE_AUTHOR("Irina Tirdea <irina.tirdea@...el.com>");
> > MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@...el.com>");
> > MODULE_LICENSE("GPL v2");
> > diff --git a/drivers/iio/accel/mma9551_core.h b/drivers/iio/accel/mma9551_core.h
> > index 0e1c9bb..19b6253 100644
> > --- a/drivers/iio/accel/mma9551_core.h
> > +++ b/drivers/iio/accel/mma9551_core.h
> > @@ -21,9 +21,13 @@
> > #define MMA9551_APPID_AFE 0x06
> > #define MMA9551_APPID_TILT 0x0B
> > #define MMA9551_APPID_SLEEP_WAKE 0x12
> > -#define MMA9551_APPID_RESET 0x17
> > +#define MMA9551_APPID_PEDOMETER 0x15
> > +#define MMA9551_APPID_RCS 0x17
> > #define MMA9551_APPID_NONE 0xff
> >
> > +/* Reset/Suspend/Clear application app masks */
> > +#define MMA9551_RSC_PED BIT(21)
> > +
> > #define MMA9551_AUTO_SUSPEND_DELAY_MS 2000
> >
> > enum mma9551_gpio_pin {
> > @@ -56,8 +60,18 @@ int mma9551_write_config_byte(struct i2c_client *client, u8 app_id,
> > u16 reg, u8 val);
> > int mma9551_read_status_byte(struct i2c_client *client, u8 app_id,
> > u16 reg, u8 *val);
> > +int mma9551_read_config_word(struct i2c_client *client, u8 app_id,
> > + u16 reg, u16 *val);
> > +int mma9551_write_config_word(struct i2c_client *client, u8 app_id,
> > + u16 reg, u16 val);
> > int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
> > u16 reg, u16 *val);
> > +int mma9551_read_config_words(struct i2c_client *client, u8 app_id,
> > + u16 reg, u8 len, u16 *buf);
> > +int mma9551_read_status_words(struct i2c_client *client, u8 app_id,
> > + u16 reg, u8 len, u16 *buf);
> > +int mma9551_write_config_words(struct i2c_client *client, u8 app_id,
> > + u16 reg, u8 len, u16 *buf);
> > int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
> > u16 reg, u8 mask, u8 val);
> > int mma9551_gpio_config(struct i2c_client *client, enum mma9551_gpio_pin pin,
> > @@ -70,5 +84,6 @@ int mma9551_read_accel_chan(struct i2c_client *client,
> > const struct iio_chan_spec *chan,
> > int *val, int *val2);
> > int mma9551_read_accel_scale(int *val, int *val2);
> > +int mma9551_app_reset(struct i2c_client *client, u32 app_mask);
> >
> > #endif /* _MMA9551_CORE_H_ */
> > diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c
> > new file mode 100644
> > index 0000000..35b657d
> > --- /dev/null
> > +++ b/drivers/iio/accel/mma9553.c
> > @@ -0,0 +1,1239 @@
> > +/*
> > + * Freescale MMA9553L Intelligent Pedometer driver
> > + * Copyright (c) 2014, Intel Corporation.
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms and conditions of the GNU General Public License,
> > + * version 2, as published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope 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/module.h>
> > +#include <linux/i2c.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/slab.h>
> > +#include <linux/acpi.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/iio/iio.h>
> > +#include <linux/iio/sysfs.h>
> > +#include <linux/iio/events.h>
> > +#include <linux/pm_runtime.h>
> > +#include "mma9551_core.h"
> > +
> > +#define MMA9553_DRV_NAME "mma9553"
> > +#define MMA9553_IRQ_NAME "mma9553_event"
> > +#define MMA9553_GPIO_NAME "mma9553_int"
> > +
> > +/* Pedometer configuration registers (R/W) */
> > +#define MMA9553_CONF_SLEEPMIN 0x00
> > +#define MMA9553_CONF_SLEEPMAX 0x02
> > +#define MMA9553_CONF_SLEEPTHD 0x04
> > +#define MMA9553_CONF_WORD GENMASK(15, 0)
> > +
> > +#define MMA9553_CONF_CONF_STEPLEN 0x06
> > +#define MMA9553_CONF_CONFIG BIT(15)
> > +#define MMA9553_CONF_ACT_DBCNTM BIT(14)
> > +#define MMA9553_CONF_SLP_DBCNTM BIT(13)
> > +#define MMA9553_CONF_STEPLEN GENMASK(7, 0)
> > +
> > +#define MMA9553_CONF_HEIGHT_WEIGHT 0x08
> > +#define MMA9553_CONF_HEIGHT GENMASK(15, 8)
> > +#define MMA9553_CONF_WEIGHT GENMASK(7, 0)
> > +
> > +#define MMA9553_CONF_FILTER 0x0A
> > +#define MMA9553_CONF_FILTSTEP GENMASK(15, 8)
> > +#define MMA9553_CONF_MALE BIT(7)
> > +#define MMA9553_CONF_FILTTIME GENMASK(6, 0)
> > +
> > +#define MMA9553_CONF_SPEED_STEP 0x0C
> > +#define MMA9553_CONF_SPDPRD GENMASK(15, 8)
> > +#define MMA9553_CONF_STEPCOALESCE GENMASK(7, 0)
> > +
> > +#define MMA9553_CONF_ACTTHD 0x0E
> > +
> > +/* Pedometer status registers (R-only) */
> > +#define MMA9553_STATUS 0x00
> > +#define MMA9553_STATUS_MRGFL BIT(15)
> > +#define MMA9553_STATUS_SUSPCHG BIT(14)
> > +#define MMA9553_STATUS_STEPCHG BIT(13)
> > +#define MMA9553_STATUS_ACTCHG BIT(12)
> > +#define MMA9553_STATUS_SUSP BIT(11)
> > +#define MMA9553_STATUS_ACTIVITY (BIT(10) | BIT(9) | BIT(8))
> > +#define MMA9553_STATUS_VERSION 0x00FF
> > +
> > +#define MMA9553_STEPCNT 0x02
> > +#define MMA9553_DISTANCE 0x04
> > +#define MMA9553_SPEED 0x06
> > +#define MMA9553_CALORIES 0x08
> > +#define MMA9553_SLEEPCNT 0x0A
> > +
> > +/* Pedometer events are always mapped to this pin. */
> > +#define MMA9553_DEFAULT_GPIO_PIN mma9551_gpio6
> > +#define MMA9553_DEFAULT_GPIO_POLARITY 0
> > +
> > +/* Bitnum used for gpio configuration = bit number in high status byte */
> > +#define STATUS_TO_BITNUM(bit) (ffs(bit) - 9)
> > +
> > +#define MMA9553_DEFAULT_SAMPLE_RATE 30 /* Hz */
> > +
> > +/*
> > + * The internal activity level must be stable for ACTTHD samples before
> > + * ACTIVITY is updated.The ACTIVITY variable contains the current activity
> > + * level and is updated every time a step is detected or once a second
> > + * if there are no steps. So for 100% confidence level we need to have
> > + * the same activity level for about 30 sec.
> Not entirely sure I follow this argument on the confidence level.
> We do have period to directly in_activity_walking_thresh_rising_period etc
> to directly handle how long a condition has to be active before we fire an
> event. Perhaps that would be better. You'd then make the activity threshold
> read only (just return -EINVAL in the write) and set it at say 50% when read
> back.
Yes, this does not seem to fit in_activity_walking_thresh_rising_value at all and is a perfect fit for in_activity_walking_thresh_rising_period. Will change this.
> > + */
> > +#define MMA9553_MAX_ACTTHD (MMA9553_DEFAULT_SAMPLE_RATE * 30)
> > +#define MMA9553_PERCENTAGE_TO_THD(prc) (((prc) * MMA9553_MAX_ACTTHD) / 100)
> > +#define MMA9553_THD_TO_PERCENTAGE(thr) (((thr) * 100) / MMA9553_MAX_ACTTHD)
> > +
> > +/*
> > + * Autonomously suspend pedometer if acceleration vector magnitude
> > + * is near 1g (4096 at 0.244 mg/LSB resolution) for 30 seconds.
> > + */
> > +#define MMA9553_DEFAULT_SLEEPMIN 3688 /* 0,9 g */
> > +#define MMA9553_DEFAULT_SLEEPMAX 4508 /* 1,1 g */
> > +#define MMA9553_DEFAULT_SLEEPTHD (MMA9553_DEFAULT_SAMPLE_RATE * 30)
> > +
> > +#define MMA9553_CONFIG_RETRIES 2
> > +
> > +/* Status register - activity field */
> > +enum activity_level {
> > + ACTIVITY_UNKNOWN,
> > + ACTIVITY_REST,
> > + ACTIVITY_WALKING,
> > + ACTIVITY_JOGGING,
> > + ACTIVITY_RUNNING,
> > +};
> > +
> > +struct mma9553_event {
> > + enum iio_chan_type type;
> > + enum iio_modifier mod;
> > + enum iio_event_direction dir;
> > + bool enabled;
> > +};
> > +
> > +struct mma9553_conf_regs {
> > + u16 sleepmin;
> > + u16 sleepmax;
> > + u16 sleepthd;
> > + u16 config;
> > + u16 height_weight;
> > + u16 filter;
> > + u16 speed_step;
> > + u16 actthd;
> > +} __packed;
> > +
> > +struct mma9553_data {
> > + struct i2c_client *client;
> > + struct mutex mutex;
> > + struct mma9553_conf_regs conf;
> > + struct mma9553_event *events;
> > + int num_events;
> > + u8 gpio_bitnum;
> > + /*
> > + * This is used for all features that depend on step count:
> > + * step count, distance, speed, calories.
> > + */
> > + bool stepcnt_enabled;
> > + u16 stepcnt;
> > + u8 activity;
> > +};
> > +
> > +static u8 mma9553_get_bits(u16 val, u16 mask)
> > +{
> > + return (val & mask) >> (ffs(mask) - 1);
> > +}
> > +
> > +static u16 mma9553_set_bits(u16 current_val, u16 val, u16 mask)
> > +{
> > + return (current_val & ~mask) | (val << (ffs(mask) - 1));
> > +}
> > +
> > +static enum iio_modifier mma9553_activity_to_mod(enum activity_level activity)
> > +{
> > + switch (activity) {
> > + case ACTIVITY_RUNNING:
> > + return IIO_MOD_RUNNING;
> > + case ACTIVITY_JOGGING:
> > + return IIO_MOD_JOGGING;
> > + case ACTIVITY_WALKING:
> > + return IIO_MOD_WALKING;
> > + case ACTIVITY_REST:
> > + return IIO_MOD_STILL;
> > + case ACTIVITY_UNKNOWN:
> > + default:
> > + return IIO_NO_MOD;
> > + }
> > +}
> > +
> > +static struct mma9553_event *mma9553_get_event(struct mma9553_data *data,
> > + enum iio_chan_type type,
> > + enum iio_modifier mod,
> > + enum iio_event_direction dir)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < data->num_events; i++)
> > + if (data->events[i].type == type &&
> > + data->events[i].mod == mod &&
> > + data->events[i].dir == dir)
> > + return &data->events[i];
> blank line.
> > + return NULL;
> > +}
> > +
> > +static bool mma9553_is_any_event_enabled(struct mma9553_data *data,
> > + bool check_type,
> > + enum iio_chan_type type)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < data->num_events; i++)
> > + if ((check_type && data->events[i].type == type &&
> > + data->events[i].enabled) ||
> > + (!check_type && data->events[i].enabled))
> > + return true;
> > + return false;
> > +}
> > +
> > +static int mma9553_set_config(struct mma9553_data *data, u16 reg,
> > + u16 *p_reg_val, u16 val, u16 mask)
> > +{
> > + int ret, retries;
> > + u16 reg_val, config;
> > +
> > + reg_val = *p_reg_val;
> > + if (val == mma9553_get_bits(reg_val, mask))
> > + return 0;
> > +
> > + reg_val = mma9553_set_bits(reg_val, val, mask);
> > + ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
> > + reg, reg_val);
> > + if (ret < 0) {
> > + dev_err(&data->client->dev,
> > + "error writing config register 0x%x\n", reg);
> > + return ret;
> > + }
> > +
> > + *p_reg_val = reg_val;
> > +
> > + /* Reinitializes the pedometer with current configuration values */
> > + config = mma9553_set_bits(data->conf.config, 1, MMA9553_CONF_CONFIG);
> > +
> > + ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
> > + MMA9553_CONF_CONF_STEPLEN, config);
> > + if (ret < 0) {
> > + dev_err(&data->client->dev,
> > + "error writing config register 0x%x\n",
> > + MMA9553_CONF_CONF_STEPLEN);
> > + return ret;
> > + }
> > +
> > + retries = MMA9553_CONFIG_RETRIES;
> > + do {
> > + mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
> > + ret = mma9551_read_config_word(data->client,
> > + MMA9551_APPID_PEDOMETER,
> > + MMA9553_CONF_CONF_STEPLEN,
> > + &config);
> > + if (ret < 0)
> > + return ret;
> > + } while (mma9553_get_bits(config, MMA9553_CONF_CONFIG) &&
> > + --retries > 0);
> > +
> > + return 0;
> > +}
> > +
> > +static int mma9553_read_activity_stepcnt(struct mma9553_data *data,
> > + u8 *activity, u16 *stepcnt)
> > +{
> > + u32 status_stepcnt;
> > + u16 status;
> > + int ret;
> > +
> > + ret = mma9551_read_status_words(data->client, MMA9551_APPID_PEDOMETER,
> > + MMA9553_STATUS, sizeof(u32),
> > + (u16 *) &status_stepcnt);
> > + if (ret < 0) {
> > + dev_err(&data->client->dev,
> > + "error reading status and stepcnt\n");
> > + return ret;
> > + }
> > +
> > + status = status_stepcnt & MMA9553_CONF_WORD;
> > + *activity = mma9553_get_bits(status, MMA9553_STATUS_ACTIVITY);
> > + *stepcnt = status_stepcnt >> 16;
> > + return 0;
> > +}
> > +
> > +static int mma9553_conf_gpio(struct mma9553_data *data)
> > +{
> > + u8 bitnum = 0, appid = MMA9551_APPID_PEDOMETER;
> > + int ret;
> > + struct mma9553_event *ev_step_detect;
> > + bool activity_enabled;
> > +
> > + activity_enabled =
> > + mma9553_is_any_event_enabled(data, true, IIO_ACTIVITY);
> > + ev_step_detect =
> > + mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD, IIO_EV_DIR_NONE);
> > +
> > + /*
> > + * If both step detector and activity are enabled, use the MRGFL bit.
> > + * This bit is the logical OR of the SUSPCHG, STEPCHG, and ACTCHG flags.
> > + */
> No brackets around single line statements (i.e. Drop all the {} below.)
Ok.
> > + if (activity_enabled && ev_step_detect->enabled) {
> > + bitnum = STATUS_TO_BITNUM(MMA9553_STATUS_MRGFL);
> > + } else if (ev_step_detect->enabled) {
> > + bitnum = STATUS_TO_BITNUM(MMA9553_STATUS_STEPCHG);
> > + } else if (activity_enabled) {
> > + bitnum = STATUS_TO_BITNUM(MMA9553_STATUS_ACTCHG);
> > + } else { /* Reset */
> > + appid = MMA9551_APPID_NONE;
> > + }
> > +
> > + if (data->gpio_bitnum == bitnum)
> > + return 0;
> > +
> > + /* Save initial values for activity and stepcnt */
> > + if (activity_enabled || ev_step_detect->enabled)
> > + mma9553_read_activity_stepcnt(data, &data->activity,
> > + &data->stepcnt);
> > +
> > + ret = mma9551_gpio_config(data->client,
> > + MMA9553_DEFAULT_GPIO_PIN,
> > + appid, bitnum, MMA9553_DEFAULT_GPIO_POLARITY);
> > + if (ret < 0)
> > + return ret;
> > + data->gpio_bitnum = bitnum;
> blank line here.
Seems I am consistent in missing these blank lines ... :) I will fix all instances.
> > + return 0;
> > +}
> > +
> > +static int mma9553_init(struct mma9553_data *data)
> > +{
> > + int ret;
> > +
> > + ret = mma9551_read_version(data->client);
> > + if (ret)
> > + return ret;
> > +
> > + /*
> > + * Read all the pedometer configuration registers. This is used as
> > + * a device identification command to differentiate the MMA9553L
> > + * from the MMA9550L.
> > + */
> > + ret =
> > + mma9551_read_config_words(data->client, MMA9551_APPID_PEDOMETER,
> > + MMA9553_CONF_SLEEPMIN,
> > + sizeof(data->conf), (u16 *) &data->conf);
> > + if (ret < 0) {
> > + dev_err(&data->client->dev,
> > + "device is not MMA9553L: failed to read cfg regs.\n");
> > + return ret;
> > + }
> > +
> > +
> > + /* Reset gpio */
> > + data->gpio_bitnum = -1;
> > + ret = mma9553_conf_gpio(data);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = mma9551_app_reset(data->client, MMA9551_RSC_PED);
> > + if (ret < 0)
> > + return ret;
> > +
> > + /* Init config registers */
> > + data->conf.sleepmin = MMA9553_DEFAULT_SLEEPMIN;
> > + data->conf.sleepmax = MMA9553_DEFAULT_SLEEPMAX;
> > + data->conf.sleepthd = MMA9553_DEFAULT_SLEEPTHD;
> > + data->conf.config =
> > + mma9553_set_bits(data->conf.config, 1, MMA9553_CONF_CONFIG);
> > + /*
> > + * Clear the activity debounce counter when the activity level changes,
> > + * so that the confidence level applies for any activity level.
> > + */
> > + data->conf.config =
> > + mma9553_set_bits(data->conf.config, 1, MMA9553_CONF_ACT_DBCNTM);
> > + ret =
> > + mma9551_write_config_words(data->client, MMA9551_APPID_PEDOMETER,
> > + MMA9553_CONF_SLEEPMIN,
> > + sizeof(data->conf), (u16 *) &data->conf);
> > + if (ret < 0) {
> > + dev_err(&data->client->dev,
> > + "failed to write configuration registers.\n");
> > + return ret;
> > + }
> > +
> > + return mma9551_set_device_state(data->client, true);
> > +}
> > +
> > +static int mma9553_read_raw(struct iio_dev *indio_dev,
> > + struct iio_chan_spec const *chan,
> > + int *val, int *val2, long mask)
> > +{
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > + int ret;
> > + u16 tmp;
> > + u8 activity;
> > + bool powered_on;
> > +
> > + switch (mask) {
> > + case IIO_CHAN_INFO_PROCESSED:
> > + switch (chan->type) {
> > + case IIO_STEPS:
> > + /*
> > + * The HW only counts steps and other dependent
> > + * parameters (speed, distance, calories, activity)
> > + * if power is on (from enabling an event or the
> > + * step counter */
> > + powered_on =
> > + mma9553_is_any_event_enabled(data, false, 0) ||
> > + data->stepcnt_enabled;
> > + if (!powered_on)
> > + return -EINVAL;
> > + mutex_lock(&data->mutex);
> > + ret = mma9551_read_status_word(data->client,
> > + MMA9551_APPID_PEDOMETER,
> > + MMA9553_STEPCNT, &tmp);
> > + mutex_unlock(&data->mutex);
> > + if (ret < 0)
> > + return ret;
> > + *val = tmp;
> > + return IIO_VAL_INT;
> > + case IIO_DISTANCE:
> > + powered_on =
> > + mma9553_is_any_event_enabled(data, false, 0) ||
> > + data->stepcnt_enabled;
> > + if (!powered_on)
> > + return -EINVAL;
> > + mutex_lock(&data->mutex);
> > + ret = mma9551_read_status_word(data->client,
> > + MMA9551_APPID_PEDOMETER,
> > + MMA9553_DISTANCE, &tmp);
> > + mutex_unlock(&data->mutex);
> > + if (ret < 0)
> > + return ret;
> > + *val = tmp;
> > + return IIO_VAL_INT;
> > + case IIO_ACTIVITY:
> > + powered_on =
> > + mma9553_is_any_event_enabled(data, false, 0) ||
> > + data->stepcnt_enabled;
> > + if (!powered_on)
> > + return -EINVAL;
> > + mutex_lock(&data->mutex);
> > + ret = mma9551_read_status_word(data->client,
> > + MMA9551_APPID_PEDOMETER,
> > + MMA9553_STATUS, &tmp);
> > + mutex_unlock(&data->mutex);
> > + if (ret < 0)
> > + return ret;
> > +
> > + activity =
> > + mma9553_get_bits(tmp, MMA9553_STATUS_ACTIVITY);
> > +
> > + /*
> > + * The device does not support confidence value levels,
> > + * so we will always have 100% for current activity and
> > + * 0% for the others.
> > + */
> > + if (chan->channel2 == mma9553_activity_to_mod(activity))
> > + *val = 100;
> > + else
> > + *val = 0;
> > + return IIO_VAL_INT;
> > + default:
> > + return -EINVAL;
> > + }
> > + case IIO_CHAN_INFO_RAW:
> > + switch (chan->type) {
> > + case IIO_SPEED: /* m/h */
> > + powered_on =
> > + mma9553_is_any_event_enabled(data, false, 0) ||
> > + data->stepcnt_enabled;
> > + if (!powered_on)
> > + return -EINVAL;
> Seems like there ought to be a better error code - but I can't find one ;)
Yes, EINVAL does not offer enough information to the user, but I could not find a better option either. I will print an error message as well to make this more clear to the user.
> > + mutex_lock(&data->mutex);
> > + ret = mma9551_read_status_word(data->client,
> > + MMA9551_APPID_PEDOMETER,
> > + MMA9553_SPEED, &tmp);
> > + mutex_unlock(&data->mutex);
> > + if (ret < 0)
> > + return ret;
> > + *val = tmp;
> > + return IIO_VAL_INT;
> > + case IIO_CALORIES: /* Cal or kcal */
> > + powered_on =
> > + mma9553_is_any_event_enabled(data, false, 0) ||
> > + data->stepcnt_enabled;
> > + if (!powered_on)
> > + return -EINVAL;
> > + mutex_lock(&data->mutex);
> > + ret = mma9551_read_status_word(data->client,
> > + MMA9551_APPID_PEDOMETER,
> > + MMA9553_CALORIES, &tmp);
> > + mutex_unlock(&data->mutex);
> > + if (ret < 0)
> > + return ret;
> > + *val = tmp;
> > + return IIO_VAL_INT;
> > + case IIO_ACCEL:
> > + mutex_lock(&data->mutex);
> > + ret = mma9551_read_accel_chan(data->client,
> > + chan, val, val2);
> > + mutex_unlock(&data->mutex);
> > + return ret;
> > + default:
> > + return -EINVAL;
> > + }
> > + case IIO_CHAN_INFO_SCALE:
> > + switch (chan->type) {
> > + case IIO_SPEED: /* m/h to m/s */
> > + *val = 0;
> > + *val2 = 277; /* 0.000277 */
> > + return IIO_VAL_INT_PLUS_MICRO;
> > + case IIO_CALORIES: /* Cal or kcal to J */
> > + *val = 4184;
> > + return IIO_VAL_INT;
> > + case IIO_ACCEL:
> > + return mma9551_read_accel_scale(val, val2);
> > + default:
> > + return -EINVAL;
> > + }
> > + case IIO_CHAN_INFO_ENABLE:
> > + *val = data->stepcnt_enabled;
> > + return IIO_VAL_INT;
> > + case IIO_CHAN_INFO_CALIBHEIGHT:
> > + *val = mma9553_get_bits(data->conf.height_weight,
> > + MMA9553_CONF_HEIGHT);
> > + return IIO_VAL_INT;
> > + case IIO_CHAN_INFO_CALIBWEIGHT:
> > + *val = mma9553_get_bits(data->conf.height_weight,
> > + MMA9553_CONF_WEIGHT);
> > + return IIO_VAL_INT;
> > + case IIO_CHAN_INFO_CALIBGENDER:
> > + *val = mma9553_get_bits(data->conf.filter, MMA9553_CONF_MALE);
> > + return IIO_VAL_INT;
> > + case IIO_CHAN_INFO_OFFSET:
> > + switch (chan->type) {
> > + case IIO_STEPS:
> > + *val = mma9553_get_bits(data->conf.filter,
> > + MMA9553_CONF_FILTSTEP);
> > + return IIO_VAL_INT;
> > + default:
> > + return -EINVAL;
> > + }
> > + case IIO_CHAN_INFO_INT_TIME:
> > + switch (chan->type) {
> > + case IIO_STEPS:
> > + *val = mma9553_get_bits(data->conf.filter,
> > + MMA9553_CONF_FILTTIME);
> > + return IIO_VAL_INT;
> > + case IIO_SPEED:
> > + *val = mma9553_get_bits(data->conf.speed_step,
> > + MMA9553_CONF_SPDPRD);
> > + return IIO_VAL_INT;
> > + default:
> > + return -EINVAL;
> > + }
> > + default:
> > + return -EINVAL;
> > + }
> > +}
> > +
> > +static int mma9553_write_raw(struct iio_dev *indio_dev,
> > + struct iio_chan_spec const *chan,
> > + int val, int val2, long mask)
> > +{
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > + int ret;
> > +
> > + switch (mask) {
> > + case IIO_CHAN_INFO_ENABLE:
> > + if (data->stepcnt_enabled == !!val)
> > + return 0;
> > + mutex_lock(&data->mutex);
> > + ret = mma9551_set_power_state(data->client, val);
> > + if (ret < 0) {
> > + mutex_unlock(&data->mutex);
> > + return ret;
> > + }
> > + data->stepcnt_enabled = val;
> > + mutex_unlock(&data->mutex);
> > + return 0;
> > + case IIO_CHAN_INFO_CALIBHEIGHT:
> > + if (val < 0 || val > 255)
> > + return -EINVAL;
> > + mutex_lock(&data->mutex);
> > + ret = mma9553_set_config(data,
> > + MMA9553_CONF_HEIGHT_WEIGHT,
> > + &data->conf.height_weight,
> > + val, MMA9553_CONF_HEIGHT);
> > + mutex_unlock(&data->mutex);
> > + return ret;
> > + case IIO_CHAN_INFO_CALIBWEIGHT:
> > + if (val < 0 || val > 255)
> > + return -EINVAL;
> > + mutex_lock(&data->mutex);
> > + ret = mma9553_set_config(data,
> > + MMA9553_CONF_HEIGHT_WEIGHT,
> > + &data->conf.height_weight,
> > + val, MMA9553_CONF_WEIGHT);
> > + mutex_unlock(&data->mutex);
> > + return ret;
> > + case IIO_CHAN_INFO_CALIBGENDER:
> As commented before - no magic numbers. Hence this will need to use
> the extended interface with enums etc.
Yes, will replace this with ext_info.
> > + /* Gender can only be 0(female) or 1(male) */
> > + if ((val != 0) && (val != 1))
> > + return -EINVAL;
> > + mutex_lock(&data->mutex);
> > + ret = mma9553_set_config(data, MMA9553_CONF_FILTER,
> > + &data->conf.filter, val,
> > + MMA9553_CONF_MALE);
> > + mutex_unlock(&data->mutex);
> > + return ret;
> > + case IIO_CHAN_INFO_OFFSET:
> > + switch (chan->type) {
> > + case IIO_STEPS:
> This seems like an ususual use of offset.
> A quick look is this is about rejection of steps based on the fact the
> user doesn't seem to be walking. It's not an offset that I can see.
> Probably needs a completely new interface.
>
> Off the top of my head
>
> in_steps_filter_outliers_num
> and
> in_steps_filter_outliers_period
>
> err. Not that keen on this though but will let you propose something better!
This sounds good. I would use in_steps_filter_outliers_thresh instead of in_steps_filter_outliers_num to make it more clear we filter steps below a threshold.
> > + /*
> > + * Set to 0 to disable step filtering. If the value
> > + * specified is greater than 6, then 6 will be used.
> > + */
> > + if (val < 0)
> > + return -EINVAL;
> > + if (val > 6)
> > + val = 6;
> > + mutex_lock(&data->mutex);
> > + ret = mma9553_set_config(data, MMA9553_CONF_FILTER,
> > + &data->conf.filter, val,
> > + MMA9553_CONF_FILTSTEP);
> > + mutex_unlock(&data->mutex);
> > + return ret;
> > + default:
> > + return -EINVAL;
> > + }
> > + case IIO_CHAN_INFO_INT_TIME:
> > + switch (chan->type) {
> > + case IIO_STEPS:
> > + if (val < 0 || val > 127)
> > + return -EINVAL;
> > + mutex_lock(&data->mutex);
> > + ret = mma9553_set_config(data, MMA9553_CONF_FILTER,
> > + &data->conf.filter, val,
> > + MMA9553_CONF_FILTTIME);
> This isn't an integration time really either... Hence need a new element
> for this.
Yes, will use in_steps_filter_outliers_period mentioned above.
> > + mutex_unlock(&data->mutex);
> > + return ret;
> > + case IIO_SPEED:
> > + /*
> > + * If set to a value greater than 5, then 5 will be
> > + * used. Warning: Do not set SPDPRD to 0 or 1 as
> > + * this may cause undesirable behavior.
> > + */
> I suppose this one is an integration time (be in it a different fashion to
> normal!)
> > + if (val < 2)
> > + return -EINVAL;
> > + if (val > 5)
> > + val = 5;
> > + mutex_lock(&data->mutex);
> > + ret = mma9553_set_config(data, MMA9553_CONF_SPEED_STEP,
> > + &data->conf.speed_step, val,
> > + MMA9553_CONF_SPDPRD);
> > + mutex_unlock(&data->mutex);
> > + return ret;
> > + default:
> > + return -EINVAL;
> > + }
> > + default:
> > + return -EINVAL;
> > + }
> > +}
> > +
> > +static int mma9553_read_event_config(struct iio_dev *indio_dev,
> > + const struct iio_chan_spec *chan,
> > + enum iio_event_type type,
> > + enum iio_event_direction dir)
> > +{
> > +
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > + struct mma9553_event *event;
> > +
> > + event = mma9553_get_event(data, chan->type, chan->channel2, dir);
> > + if (!event)
> > + return -EINVAL;
> blank line here prefered. (or someone one will send me a patch adding
> one within the week!)
> > + return event->enabled;
> > +}
> > +
> > +static int mma9553_write_event_config(struct iio_dev *indio_dev,
> > + const struct iio_chan_spec *chan,
> > + enum iio_event_type type,
> > + enum iio_event_direction dir, int state)
> > +{
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > + struct mma9553_event *event;
> > + int ret;
> > +
> > + event = mma9553_get_event(data, chan->type, chan->channel2, dir);
> > + if (!event)
> > + return -EINVAL;
> > +
> > + if (event->enabled == state)
> > + return 0;
> > +
> > + mutex_lock(&data->mutex);
> > +
> > + ret = mma9551_set_power_state(data->client, state);
> > + if (ret < 0)
> > + goto out;
> > + event->enabled = state;
> > +
> > + ret = mma9553_conf_gpio(data);
> > + if (ret < 0)
> > + goto err_conf_gpio;
> > +
> > + goto out;
> Normal code style in IIO at least would be to have a separate return
> here (with unlocking) rather than jumping to the end of the error
> handling. Bit easier to follow.
Ok, will change this.
> > +
> > +err_conf_gpio:
> > + if (state) {
> > + event->enabled = false;
> > + mma9551_set_power_state(data->client, false);
> > + }
> > +out:
> > + mutex_unlock(&data->mutex);
> > + return ret;
> > +}
> > +
> > +static int mma9553_read_event_value(struct iio_dev *indio_dev,
> > + const struct iio_chan_spec *chan,
> > + enum iio_event_type type,
> > + enum iio_event_direction dir,
> > + enum iio_event_info info,
> > + int *val, int *val2)
> > +{
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > + int prc;
> > +
> > + *val2 = 0;
> > + switch (info) {
> > + case IIO_EV_INFO_VALUE:
> > + switch (chan->type) {
> > + case IIO_ACTIVITY:
> > + prc = MMA9553_THD_TO_PERCENTAGE(data->conf.actthd);
> > + if (dir == IIO_EV_DIR_RISING)
> > + *val = prc;
> > + else if (dir == IIO_EV_DIR_FALLING)
> > + *val = 100 - prc;
> > + else
> > + return -EINVAL;
> > + return IIO_VAL_INT;
> > + default:
> > + return -EINVAL;
> > + }
> > + case IIO_EV_INFO_PERIOD:
> > + switch (chan->type) {
> > + case IIO_STEPS:
> > + *val = mma9553_get_bits(data->conf.speed_step,
> > + MMA9553_CONF_STEPCOALESCE);
> > + return IIO_VAL_INT;
> > + default:
> > + return -EINVAL;
> > + }
> > + default:
> > + return -EINVAL;
> > + }
> > +}
> > +
> > +static int mma9553_write_event_value(struct iio_dev *indio_dev,
> > + const struct iio_chan_spec *chan,
> > + enum iio_event_type type,
> > + enum iio_event_direction dir,
> > + enum iio_event_info info,
> > + int val, int val2)
> > +{
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > + int prc, thd;
> > + int ret;
> > +
> > + switch (info) {
> > + case IIO_EV_INFO_VALUE:
> > + switch (chan->type) {
> > + case IIO_ACTIVITY:
> > + if (val < 0 || val > 100)
> > + return -EINVAL;
> > +
> > + if (dir == IIO_EV_DIR_RISING)
> > + prc = val;
> > + else if (dir == IIO_EV_DIR_FALLING)
> > + prc = 100 - val;
> > + else
> > + return -EINVAL;
> > + thd = MMA9553_PERCENTAGE_TO_THD(prc);
> > +
> > + mutex_lock(&data->mutex);
> > + ret = mma9553_set_config(data, MMA9553_CONF_ACTTHD,
> > + &data->conf.actthd, thd,
> > + MMA9553_CONF_WORD);
> As commented above. this is a threshold on how long an activity is true
> - not the direct confidence interval - so I'd suggest handling it as as
> the event period, not threshold.
> > + mutex_unlock(&data->mutex);
> > + return ret;
> > + default:
> > + return -EINVAL;
> > + }
> > + case IIO_EV_INFO_PERIOD:
> > + switch (chan->type) {
> > + case IIO_STEPS:
> > + if (val < 0 || val > 255)
> > + return -EINVAL;
> > + mutex_lock(&data->mutex);
> > + ret = mma9553_set_config(data, MMA9553_CONF_SPEED_STEP,
> > + &data->conf.speed_step, val,
> > + MMA9553_CONF_STEPCOALESCE);
> So this makes it fire every N steps? Kind of nice, but not quite what period
> is usually used for. We have talked about having an absolute change
> (rather than ROC) event type before - (requires a change of N and doesn't care
> how long it took to happen). Perhaps that makes sense here rather than
> an instance event and a period?
Considering the stepcoalesce option, a change event does make more sense. I will add IIO_CHANGE and use it instead.
Adding IIO_CHANGE event type will make IIO_INSTANCE redundant (since instance is change with a value of 1). I know once an interface is introduced it cannot be changed, but since nobody is using IIO_INSTANCE could we remove it?
>
> > + mutex_unlock(&data->mutex);
> > + return ret;
> > + default:
> > + return -EINVAL;
> > + }
> > + default:
> > + return -EINVAL;
> > + }
> > +}
> > +
> > +static const struct iio_event_spec mma9553_step_event = {
> > + .type = IIO_EV_TYPE_INSTANCE,
> > + .dir = IIO_EV_DIR_NONE,
> > + .mask_separate = BIT(IIO_EV_INFO_ENABLE) | BIT(IIO_EV_INFO_PERIOD),
> > +};
> > +
> > +static const struct iio_event_spec mma9553_activity_events[] = {
> > + {
> > + .type = IIO_EV_TYPE_THRESH,
> > + .dir = IIO_EV_DIR_RISING,
> > + .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
> > + BIT(IIO_EV_INFO_VALUE),
> > + },
> > + {
> > + .type = IIO_EV_TYPE_THRESH,
> > + .dir = IIO_EV_DIR_FALLING,
> > + .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
> > + BIT(IIO_EV_INFO_VALUE),
> > + },
> > +};
> > +
> > +#define MMA9553_PEDOMETER_CHANNEL(_type, _mask) { \
> > + .type = _type, \
> > + .info_mask_separate = BIT(IIO_CHAN_INFO_ENABLE) | \
> > + BIT(IIO_CHAN_INFO_CALIBHEIGHT) | \
> > + BIT(IIO_CHAN_INFO_CALIBGENDER) | \
> > + _mask, \
> > +}
> > +
> > +#define MMA9553_ACTIVITY_CHANNEL(_chan2) { \
> > + .type = IIO_ACTIVITY, \
> > + .modified = 1, \
> > + .channel2 = _chan2, \
> > + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
> > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT) | \
> > + BIT(IIO_CHAN_INFO_CALIBGENDER), \
> > + .event_spec = mma9553_activity_events, \
> > + .num_event_specs = ARRAY_SIZE(mma9553_activity_events), \
> > +}
> > +
> > +static const struct iio_chan_spec mma9553_channels[] = {
> > + MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
> > + MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
> > + MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
> > +
> > + {
> > + .type = IIO_STEPS,
> > + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
> > + BIT(IIO_CHAN_INFO_ENABLE) |
> > + BIT(IIO_CHAN_INFO_OFFSET) |
> > + BIT(IIO_CHAN_INFO_INT_TIME),
> > + .event_spec = &mma9553_step_event,
> > + .num_event_specs = 1,
> > + },
> > +
> > + MMA9553_PEDOMETER_CHANNEL(IIO_DISTANCE, BIT(IIO_CHAN_INFO_PROCESSED)),
> > + MMA9553_PEDOMETER_CHANNEL(IIO_SPEED, BIT(IIO_CHAN_INFO_RAW) |
> > + BIT(IIO_CHAN_INFO_SCALE) |
> > + BIT(IIO_CHAN_INFO_INT_TIME)),
> > + MMA9553_PEDOMETER_CHANNEL(IIO_CALORIES, BIT(IIO_CHAN_INFO_RAW) |
> > + BIT(IIO_CHAN_INFO_SCALE) |
> > + BIT(IIO_CHAN_INFO_CALIBWEIGHT)),
> > +
> > + MMA9553_ACTIVITY_CHANNEL(IIO_MOD_RUNNING),
> > + MMA9553_ACTIVITY_CHANNEL(IIO_MOD_JOGGING),
> > + MMA9553_ACTIVITY_CHANNEL(IIO_MOD_WALKING),
> > + MMA9553_ACTIVITY_CHANNEL(IIO_MOD_STILL),
> > +};
> > +
> > +static const struct iio_info mma9553_info = {
> > + .driver_module = THIS_MODULE,
> > + .read_raw = mma9553_read_raw,
> > + .write_raw = mma9553_write_raw,
> > + .read_event_config = mma9553_read_event_config,
> > + .write_event_config = mma9553_write_event_config,
> > + .read_event_value = mma9553_read_event_value,
> > + .write_event_value = mma9553_write_event_value,
> > +};
> > +
> Only one copy of this? We don't want to prevent people having more
> than one of these devices attached to a given machine.
> Hence by all means have a default version of this but then
> clone it into the mma9553_data structure for manipulation.
> Or have a mached array of booleans in there (same indexes)
> to use for the "enabled"s.
>
Will fix this.
> > +static struct mma9553_event mma9553_events[] = {
> > + {
> > + .type = IIO_STEPS,
> > + .mod = IIO_NO_MOD,
> > + .dir = IIO_EV_DIR_NONE,
> > + .enabled = false,
> > + },
> > + {
> > + .type = IIO_ACTIVITY,
> > + .mod = IIO_MOD_STILL,
> > + .dir = IIO_EV_DIR_RISING,
> > + .enabled = false,
> > + },
> > + {
> > + .type = IIO_ACTIVITY,
> > + .mod = IIO_MOD_STILL,
> > + .dir = IIO_EV_DIR_FALLING,
> > + .enabled = false,
> > + },
> > + {
> > + .type = IIO_ACTIVITY,
> > + .mod = IIO_MOD_WALKING,
> > + .dir = IIO_EV_DIR_RISING,
> > + .enabled = false,
> > + },
> > + {
> > + .type = IIO_ACTIVITY,
> > + .mod = IIO_MOD_WALKING,
> > + .dir = IIO_EV_DIR_FALLING,
> > + .enabled = false,
> > + },
> > + {
> > + .type = IIO_ACTIVITY,
> > + .mod = IIO_MOD_JOGGING,
> > + .dir = IIO_EV_DIR_RISING,
> > + .enabled = false,
> > + },
> > + {
> > + .type = IIO_ACTIVITY,
> > + .mod = IIO_MOD_JOGGING,
> > + .dir = IIO_EV_DIR_FALLING,
> > + .enabled = false,
> > + },
> > + {
> > + .type = IIO_ACTIVITY,
> > + .mod = IIO_MOD_RUNNING,
> > + .dir = IIO_EV_DIR_RISING,
> > + .enabled = false,
> > + },
> > + {
> > + .type = IIO_ACTIVITY,
> > + .mod = IIO_MOD_RUNNING,
> > + .dir = IIO_EV_DIR_FALLING,
> > + .enabled = false,
> > + },
> > +};
> > +
> > +static irqreturn_t mma9553_irq_handler(int irq, void *private)
> > +{
> > + /*
> > + * Since we only configure the interrupt pin when an
> > + * event is enabled, we are sure we have at least
> > + * one event enabled at this point.
> > + */
> IIRC simply not supplyling the top half handler has the same effect as
> this (though then you don't have anywhere to put the comment!)
> Actually - I'd be tempted to grab and stash a timestamp in here to
> increase the precision of you step timing etc.
Initially I used a NULL pointer instead of mma9553_irq_handler in devm_request_threaded_irq, but the registration failed with "Threaded irq requested with handler=NULL and !ONESHOT".
However, it is better to grab the timestamp anyway so I will do that here.
> > + return IRQ_WAKE_THREAD;
> > +}
> > +
> > +static irqreturn_t mma9553_event_handler(int irq, void *private)
> > +{
> > + struct iio_dev *indio_dev = private;
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > + u16 stepcnt;
> > + u8 activity;
> > + struct mma9553_event *ev_activity, *ev_prev_activity, *ev_step_detect;
> > + int ret;
> > +
> > + mutex_lock(&data->mutex);
> > + ret = mma9553_read_activity_stepcnt(data, &activity, &stepcnt);
> > + if (ret < 0) {
> > + mutex_unlock(&data->mutex);
> > + return IRQ_HANDLED;
> > + }
> > +
> > + ev_prev_activity =
> > + mma9553_get_event(data, IIO_ACTIVITY,
> > + mma9553_activity_to_mod(data->activity),
> > + IIO_EV_DIR_FALLING);
> > + ev_activity =
> > + mma9553_get_event(data, IIO_ACTIVITY,
> > + mma9553_activity_to_mod(activity),
> > + IIO_EV_DIR_RISING);
> > + ev_step_detect =
> > + mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD, IIO_EV_DIR_NONE);
> > +
> > + if (ev_step_detect->enabled && (stepcnt != data->stepcnt)) {
> > + data->stepcnt = stepcnt;
> > + iio_push_event(indio_dev,
> > + IIO_EVENT_CODE(IIO_STEPS, 0, IIO_NO_MOD,
> > + IIO_EV_DIR_NONE, IIO_EV_TYPE_INSTANCE, 0, 0, 0),
> > + iio_get_time_ns());
> Worth grabbing the timestamp earlier than this for precision reasons?
> > + }
> > +
> > + if (activity != data->activity) {
> > + data->activity = activity;
> > + /* ev_activity can be NULL if activity == ACTIVITY_UNKNOWN */
> > + if (ev_prev_activity && ev_prev_activity->enabled)
> > + iio_push_event(indio_dev,
> > + IIO_EVENT_CODE(IIO_ACTIVITY, 0,
> > + ev_prev_activity->mod,
> > + IIO_EV_DIR_FALLING,
> > + IIO_EV_TYPE_THRESH, 0, 0, 0),
> > + iio_get_time_ns());
> > +
> > + if (ev_activity && ev_activity->enabled)
> > + iio_push_event(indio_dev,
> > + IIO_EVENT_CODE(IIO_ACTIVITY, 0,
> > + ev_activity->mod,
> > + IIO_EV_DIR_RISING,
> > + IIO_EV_TYPE_THRESH, 0, 0, 0),
> > + iio_get_time_ns());
> > + }
> > + mutex_unlock(&data->mutex);
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int mma9553_gpio_probe(struct i2c_client *client)
> > +{
> > + struct device *dev;
> > + struct gpio_desc *gpio;
> > + int ret;
> > +
> > + if (!client)
> > + return -EINVAL;
> > +
> > + dev = &client->dev;
> > +
> > + /* data ready gpio interrupt pin */
> > + gpio = devm_gpiod_get_index(dev, MMA9553_GPIO_NAME, 0);
> > + if (IS_ERR(gpio)) {
> > + dev_err(dev, "acpi gpio get index failed\n");
> > + return PTR_ERR(gpio);
> > + }
> > +
> > + ret = gpiod_direction_input(gpio);
> > + if (ret)
> > + return ret;
> > +
> > + ret = gpiod_to_irq(gpio);
> > +
> > + dev_dbg(dev, "gpio resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
> > +
> > + return ret;
> > +}
> > +
> > +static const char *mma9553_match_acpi_device(struct device *dev)
> > +{
> > + const struct acpi_device_id *id;
> > +
> > + id = acpi_match_device(dev->driver->acpi_match_table, dev);
> > + if (!id)
> > + return NULL;
> > +
> > + return dev_name(dev);
> > +}
> > +
> > +static int mma9553_probe(struct i2c_client *client,
> > + const struct i2c_device_id *id)
> > +{
> > + struct mma9553_data *data;
> > + struct iio_dev *indio_dev;
> > + const char *name = NULL;
> > + int ret;
> > +
> > + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
> > + if (!indio_dev)
> > + return -ENOMEM;
> > +
> > + data = iio_priv(indio_dev);
> > + i2c_set_clientdata(client, indio_dev);
> > + data->client = client;
> > +
> > + if (id)
> > + name = id->name;
> > + else if (ACPI_HANDLE(&client->dev))
> > + name = mma9553_match_acpi_device(&client->dev);
> > + else
> Interesting to note the original driver doesn't have this else. Worth
> checking?
There was a similar check in the initial driver (it checked for name == NULL instead) that somehow got removed in a later version.
I could add the check in mma9551 as well, but I am not sure on what is the proper way to handle this.
There is an ongoing discussion on this: http://www.spinics.net/lists/linux-iio/msg16231.html.
I would rather for this to be cleared out and send a separate patch to fix both drivers if needed.
> > + return -ENOSYS;
> > +
> > + mutex_init(&data->mutex);
> > + data->events = mma9553_events;
> > + data->num_events = ARRAY_SIZE(mma9553_events);
> > +
> > + ret = mma9553_init(data);
> > + if (ret < 0)
> > + return ret;
> > +
> > + indio_dev->dev.parent = &client->dev;
> > + indio_dev->channels = mma9553_channels;
> > + indio_dev->num_channels = ARRAY_SIZE(mma9553_channels);
> > + indio_dev->name = name;
> > + indio_dev->modes = INDIO_DIRECT_MODE;
> > + indio_dev->info = &mma9553_info;
> > +
> > + if (client->irq < 0)
> > + client->irq = mma9553_gpio_probe(client);
> > +
> So this time we just have a single irq. That makes life simpler!
Yes, mma9553 provides the option to combine all its interrupts in one status bit (while mma9551 does not).
> > + if (client->irq >= 0) {
> > + ret = devm_request_threaded_irq(&client->dev, client->irq,
> > + mma9553_irq_handler,
> > + mma9553_event_handler,
> > + IRQF_TRIGGER_RISING,
> > + MMA9553_IRQ_NAME, indio_dev);
> > + if (ret < 0) {
> > + dev_err(&client->dev, "request irq %d failed\n",
> > + client->irq);
> > + goto out_poweroff;
> > + }
> > +
> > + }
> > +
> > + ret = iio_device_register(indio_dev);
> > + if (ret < 0) {
> > + dev_err(&client->dev, "unable to register iio device\n");
> > + goto out_poweroff;
> > + }
> > +
> > + ret = pm_runtime_set_active(&client->dev);
> > + if (ret < 0)
> > + goto out_iio_unregister;
> > +
> > + pm_runtime_enable(&client->dev);
> > + pm_runtime_set_autosuspend_delay(&client->dev,
> > + MMA9551_AUTO_SUSPEND_DELAY_MS);
> > + pm_runtime_use_autosuspend(&client->dev);
> > +
> > + dev_dbg(&indio_dev->dev, "Registered device %s\n", name);
> > + return 0;
> > +
> > +out_iio_unregister:
> > + iio_device_unregister(indio_dev);
> > +out_poweroff:
> > + mma9551_set_device_state(client, false);
> > + return ret;
> > +}
> > +
> > +static int mma9553_remove(struct i2c_client *client)
> > +{
> > + struct iio_dev *indio_dev = i2c_get_clientdata(client);
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > +
> > + pm_runtime_disable(&client->dev);
> > + pm_runtime_set_suspended(&client->dev);
> > + pm_runtime_put_noidle(&client->dev);
> > +
> > + iio_device_unregister(indio_dev);
> > + mutex_lock(&data->mutex);
> > + mma9551_set_device_state(data->client, false);
> > + mutex_unlock(&data->mutex);
> > +
> > + return 0;
> > +}
> > +
> > +#ifdef CONFIG_PM
> > +static int mma9553_runtime_suspend(struct device *dev)
> > +{
> > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > + int ret;
> > +
> > + mutex_lock(&data->mutex);
> > + ret = mma9551_set_device_state(data->client, false);
> > + mutex_unlock(&data->mutex);
> > + if (ret < 0) {
> > + dev_err(&data->client->dev, "powering off device failed\n");
> > + return -EAGAIN;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int mma9553_runtime_resume(struct device *dev)
> > +{
> > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > + int ret;
> > +
> > + ret = mma9551_set_device_state(data->client, true);
> > + if (ret < 0)
> > + return ret;
> > +
> > + mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
> > + return 0;
> > +}
> > +#endif
> > +
> > +#ifdef CONFIG_PM_SLEEP
> > +static int mma9553_suspend(struct device *dev)
> > +{
> > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > + int ret;
> > +
> > + mutex_lock(&data->mutex);
> > + ret = mma9551_set_device_state(data->client, false);
> > + mutex_unlock(&data->mutex);
> > +
> > + return ret;
> > +}
> > +
> > +static int mma9553_resume(struct device *dev)
> > +{
> > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> > + struct mma9553_data *data = iio_priv(indio_dev);
> > + int ret;
> > +
> > + mutex_lock(&data->mutex);
> > + ret = mma9551_set_device_state(data->client, true);
> > + mutex_unlock(&data->mutex);
> > +
> > + return ret;
> > +}
> > +#endif
> > +
> > +static const struct dev_pm_ops mma9553_pm_ops = {
> > + SET_SYSTEM_SLEEP_PM_OPS(mma9553_suspend, mma9553_resume)
> > + SET_RUNTIME_PM_OPS(mma9553_runtime_suspend,
> > + mma9553_runtime_resume, NULL)
> > +};
> > +
> > +static const struct acpi_device_id mma9553_acpi_match[] = {
> > + {"MMA9553", 0},
> > + {},
> > +};
> > +
> > +MODULE_DEVICE_TABLE(acpi, mma9553_acpi_match);
> > +
> > +static const struct i2c_device_id mma9553_id[] = {
> > + {"mma9553", 0},
> > + {},
> > +};
> > +
> > +MODULE_DEVICE_TABLE(i2c, mma9553_id);
> > +
> > +static struct i2c_driver mma9553_driver = {
> > + .driver = {
> > + .name = MMA9553_DRV_NAME,
> > + .acpi_match_table = ACPI_PTR(mma9553_acpi_match),
> > + .pm = &mma9553_pm_ops,
> > + },
> > + .probe = mma9553_probe,
> > + .remove = mma9553_remove,
> > + .id_table = mma9553_id,
> > +};
> > +
> > +module_i2c_driver(mma9553_driver);
> > +
> > +MODULE_AUTHOR("Irina Tirdea <irina.tirdea@...el.com>");
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_DESCRIPTION("MMA9553L pedometer platform driver");
> >
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