On Thu, Jan 01, 2015 at 01:14:55PM +0000, Jonathan Cameron wrote: > On 29/12/14 12:41, Vlad Dogaru wrote: > > Supports buffering, IIO events and changing sampling frequency. > > > > Datasheet available at: > > http://www.semtech.com/images/datasheet/sx9500_ag.pdf > > > > Signed-off-by: Vlad Dogaru <vlad.dogaru@xxxxxxxxx> > > Reviewed-by: Hartmut Knaack <knaack.h@xxxxxx> > one last bit as a result of new stuff. > Update_scan_mode can do an allocation of 0 size which gets us into > 'interesting' territory. Not sure what gcc will do in that case, but > probably best avoided. Otherwise fine. > > Actually as it's just that I'll fix it up and apply. Please take a look > at my testing branch to check I haven't messed it up though! Fixup looks good to me, but I am not sure if it was needed. It looks like kmalloc(0) returns ZERO_SIZE_PTR, which cannot be safely dereferenced, but can be passed to kfree(). This is documented in include/linux/slab.h. If you think it's better to explicitly disallow kzalloc(0), I have no problem with keeping the code as it is now in the testing branch. Thanks, Vlad > > --- > > Changes since v4: > > - don't use ternary operator inside function call in write_event_config; > > - allocate buffer only once, in update_scan_mode callback, instead of each > > time the trigger is called; > > - correctly unregister trigger and buffer with respect to client->irq; > > > > Changes since v3: > > - remove unnecessary typecast and double negation; > > > > Changes since v2: > > - use GENMASK, BIT, ARRAY_SIZE macros where appropriate; > > - use bool instead of int for prox_stat; > > - rework sample frequency table code; > > - consolidate event config sanity checks to a single condition; > > - fix bug when deciding to disable proximity IRQ; > > - prefer kzalloc to kmalloc; > > - only cleanup trigger if it was registered (irq > 0); > > - add mention for building as module in Kconfig help text; > > > > Changes since v1: > > - report raw readings of the channels instead of just 0 or 1. > > - add a new Kconfig section for proximity and leave the lightning sensor in its > > own one. > > > > drivers/iio/proximity/Kconfig | 17 + > > drivers/iio/proximity/Makefile | 1 + > > drivers/iio/proximity/sx9500.c | 752 +++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 770 insertions(+) > > create mode 100644 drivers/iio/proximity/sx9500.c > > > > diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig > > index 0c8cdf5..41a8d8f 100644 > > --- a/drivers/iio/proximity/Kconfig > > +++ b/drivers/iio/proximity/Kconfig > > @@ -17,3 +17,20 @@ config AS3935 > > module will be called as3935 > > > > endmenu > > + > > +menu "Proximity sensors" > > + > > +config SX9500 > > + tristate "SX9500 Semtech proximity sensor" > > + select IIO_BUFFER > > + select IIO_TRIGGERED_BUFFER > > + select REGMAP_I2C > > + depends on I2C > > + help > > + Say Y here to build a driver for Semtech's SX9500 capacitive > > + proximity/button sensor. > > + > > + To compile this driver as a module, choose M here: the > > + module will be called sx9500. > > + > > +endmenu > > diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile > > index 743adee..9818dc5 100644 > > --- a/drivers/iio/proximity/Makefile > > +++ b/drivers/iio/proximity/Makefile > > @@ -4,3 +4,4 @@ > > > > # When adding new entries keep the list in alphabetical order > > obj-$(CONFIG_AS3935) += as3935.o > > +obj-$(CONFIG_SX9500) += sx9500.o > > diff --git a/drivers/iio/proximity/sx9500.c b/drivers/iio/proximity/sx9500.c > > new file mode 100644 > > index 0000000..74dff4e > > --- /dev/null > > +++ b/drivers/iio/proximity/sx9500.c > > @@ -0,0 +1,752 @@ > > +/* > > + * Copyright (c) 2014 Intel Corporation > > + * > > + * Driver for Semtech's SX9500 capacitive proximity/button solution. > > + * Datasheet available at > > + * <http://www.semtech.com/images/datasheet/sx9500.pdf>. > > + * > > + * 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. > > + */ > > + > > +#include <linux/kernel.h> > > +#include <linux/slab.h> > > +#include <linux/module.h> > > +#include <linux/i2c.h> > > +#include <linux/irq.h> > > +#include <linux/acpi.h> > > +#include <linux/gpio/consumer.h> > > +#include <linux/regmap.h> > > + > > +#include <linux/iio/iio.h> > > +#include <linux/iio/buffer.h> > > +#include <linux/iio/sysfs.h> > > +#include <linux/iio/events.h> > > +#include <linux/iio/trigger.h> > > +#include <linux/iio/triggered_buffer.h> > > +#include <linux/iio/trigger_consumer.h> > > + > > +#define SX9500_DRIVER_NAME "sx9500" > > +#define SX9500_IRQ_NAME "sx9500_event" > > +#define SX9500_GPIO_NAME "sx9500_gpio" > > + > > +/* Register definitions. */ > > +#define SX9500_REG_IRQ_SRC 0x00 > > +#define SX9500_REG_STAT 0x01 > > +#define SX9500_REG_IRQ_MSK 0x03 > > + > > +#define SX9500_REG_PROX_CTRL0 0x06 > > +#define SX9500_REG_PROX_CTRL1 0x07 > > +#define SX9500_REG_PROX_CTRL2 0x08 > > +#define SX9500_REG_PROX_CTRL3 0x09 > > +#define SX9500_REG_PROX_CTRL4 0x0a > > +#define SX9500_REG_PROX_CTRL5 0x0b > > +#define SX9500_REG_PROX_CTRL6 0x0c > > +#define SX9500_REG_PROX_CTRL7 0x0d > > +#define SX9500_REG_PROX_CTRL8 0x0e > > + > > +#define SX9500_REG_SENSOR_SEL 0x20 > > +#define SX9500_REG_USE_MSB 0x21 > > +#define SX9500_REG_USE_LSB 0x22 > > +#define SX9500_REG_AVG_MSB 0x23 > > +#define SX9500_REG_AVG_LSB 0x24 > > +#define SX9500_REG_DIFF_MSB 0x25 > > +#define SX9500_REG_DIFF_LSB 0x26 > > +#define SX9500_REG_OFFSET_MSB 0x27 > > +#define SX9500_REG_OFFSET_LSB 0x28 > > + > > +#define SX9500_REG_RESET 0x7f > > + > > +/* Write this to REG_RESET to do a soft reset. */ > > +#define SX9500_SOFT_RESET 0xde > > + > > +#define SX9500_SCAN_PERIOD_MASK GENMASK(6, 4) > > +#define SX9500_SCAN_PERIOD_SHIFT 4 > > + > > +/* > > + * These serve for identifying IRQ source in the IRQ_SRC register, and > > + * also for masking the IRQs in the IRQ_MSK register. > > + */ > > +#define SX9500_CLOSE_IRQ BIT(6) > > +#define SX9500_FAR_IRQ BIT(5) > > +#define SX9500_CONVDONE_IRQ BIT(3) > > + > > +#define SX9500_PROXSTAT_SHIFT 4 > > + > > +#define SX9500_NUM_CHANNELS 4 > > + > > +struct sx9500_data { > > + struct mutex mutex; > > + struct i2c_client *client; > > + struct iio_trigger *trig; > > + struct regmap *regmap; > > + /* > > + * Last reading of the proximity status for each channel. We > > + * only send an event to user space when this changes. > > + */ > > + bool prox_stat[SX9500_NUM_CHANNELS]; > > + bool event_enabled[SX9500_NUM_CHANNELS]; > > + bool trigger_enabled; > > + u16 *buffer; > > +}; > > + > > +static const struct iio_event_spec sx9500_events[] = { > > + { > > + .type = IIO_EV_TYPE_THRESH, > > + .dir = IIO_EV_DIR_EITHER, > > + .mask_separate = BIT(IIO_EV_INFO_ENABLE), > > + }, > > +}; > > + > > +#define SX9500_CHANNEL(idx) \ > > + { \ > > + .type = IIO_PROXIMITY, \ > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > > + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ > > + .indexed = 1, \ > > + .channel = idx, \ > > + .event_spec = sx9500_events, \ > > + .num_event_specs = ARRAY_SIZE(sx9500_events), \ > > + .scan_index = idx, \ > > + .scan_type = { \ > > + .sign = 'u', \ > > + .realbits = 16, \ > > + .storagebits = 16, \ > > + .shift = 0, \ > > + }, \ > > + } > > + > > +static const struct iio_chan_spec sx9500_channels[] = { > > + SX9500_CHANNEL(0), > > + SX9500_CHANNEL(1), > > + SX9500_CHANNEL(2), > > + SX9500_CHANNEL(3), > > + IIO_CHAN_SOFT_TIMESTAMP(4), > > +}; > > + > > +static const struct { > > + int val; > > + int val2; > > +} sx9500_samp_freq_table[] = { > > + {33, 333333}, > > + {16, 666666}, > > + {11, 111111}, > > + {8, 333333}, > > + {6, 666666}, > > + {5, 0}, > > + {3, 333333}, > > + {2, 500000}, > > +}; > > + > > +static const struct regmap_range sx9500_writable_reg_ranges[] = { > > + regmap_reg_range(SX9500_REG_IRQ_MSK, SX9500_REG_IRQ_MSK), > > + regmap_reg_range(SX9500_REG_PROX_CTRL0, SX9500_REG_PROX_CTRL8), > > + regmap_reg_range(SX9500_REG_SENSOR_SEL, SX9500_REG_SENSOR_SEL), > > + regmap_reg_range(SX9500_REG_OFFSET_MSB, SX9500_REG_OFFSET_LSB), > > + regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET), > > +}; > > + > > +static const struct regmap_access_table sx9500_writeable_regs = { > > + .yes_ranges = sx9500_writable_reg_ranges, > > + .n_yes_ranges = ARRAY_SIZE(sx9500_writable_reg_ranges), > > +}; > > + > > +/* > > + * All allocated registers are readable, so we just list unallocated > > + * ones. > > + */ > > +static const struct regmap_range sx9500_non_readable_reg_ranges[] = { > > + regmap_reg_range(SX9500_REG_STAT + 1, SX9500_REG_STAT + 1), > > + regmap_reg_range(SX9500_REG_IRQ_MSK + 1, SX9500_REG_PROX_CTRL0 - 1), > > + regmap_reg_range(SX9500_REG_PROX_CTRL8 + 1, SX9500_REG_SENSOR_SEL - 1), > > + regmap_reg_range(SX9500_REG_OFFSET_LSB + 1, SX9500_REG_RESET - 1), > > +}; > > + > > +static const struct regmap_access_table sx9500_readable_regs = { > > + .no_ranges = sx9500_non_readable_reg_ranges, > > + .n_no_ranges = ARRAY_SIZE(sx9500_non_readable_reg_ranges), > > +}; > > + > > +static const struct regmap_range sx9500_volatile_reg_ranges[] = { > > + regmap_reg_range(SX9500_REG_IRQ_SRC, SX9500_REG_STAT), > > + regmap_reg_range(SX9500_REG_USE_MSB, SX9500_REG_OFFSET_LSB), > > + regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET), > > +}; > > + > > +static const struct regmap_access_table sx9500_volatile_regs = { > > + .yes_ranges = sx9500_volatile_reg_ranges, > > + .n_yes_ranges = ARRAY_SIZE(sx9500_volatile_reg_ranges), > > +}; > > + > > +static const struct regmap_config sx9500_regmap_config = { > > + .reg_bits = 8, > > + .val_bits = 8, > > + > > + .max_register = SX9500_REG_RESET, > > + .cache_type = REGCACHE_RBTREE, > > + > > + .wr_table = &sx9500_writeable_regs, > > + .rd_table = &sx9500_readable_regs, > > + .volatile_table = &sx9500_volatile_regs, > > +}; > > + > > +static int sx9500_read_proximity(struct sx9500_data *data, > > + const struct iio_chan_spec *chan, > > + int *val) > > +{ > > + int ret; > > + __be16 regval; > > + > > + ret = regmap_write(data->regmap, SX9500_REG_SENSOR_SEL, chan->channel); > > + if (ret < 0) > > + return ret; > > + > > + ret = regmap_bulk_read(data->regmap, SX9500_REG_USE_MSB, ®val, 2); > > + if (ret < 0) > > + return ret; > > + > > + *val = 32767 - (s16)be16_to_cpu(regval); > > + > > + return IIO_VAL_INT; > > +} > > + > > +static int sx9500_read_samp_freq(struct sx9500_data *data, > > + int *val, int *val2) > > +{ > > + int ret; > > + unsigned int regval; > > + > > + mutex_lock(&data->mutex); > > + ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, ®val); > > + mutex_unlock(&data->mutex); > > + > > + if (ret < 0) > > + return ret; > > + > > + regval = (regval & SX9500_SCAN_PERIOD_MASK) >> SX9500_SCAN_PERIOD_SHIFT; > > + *val = sx9500_samp_freq_table[regval].val; > > + *val2 = sx9500_samp_freq_table[regval].val2; > > + > > + return IIO_VAL_INT_PLUS_MICRO; > > +} > > + > > +static int sx9500_read_raw(struct iio_dev *indio_dev, > > + const struct iio_chan_spec *chan, > > + int *val, int *val2, long mask) > > +{ > > + struct sx9500_data *data = iio_priv(indio_dev); > > + int ret; > > + > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + switch (mask) { > > + case IIO_CHAN_INFO_RAW: > > + if (iio_buffer_enabled(indio_dev)) > > + return -EBUSY; > > + mutex_lock(&data->mutex); > > + ret = sx9500_read_proximity(data, chan, val); > > + mutex_unlock(&data->mutex); > > + return ret; > > + case IIO_CHAN_INFO_SAMP_FREQ: > > + return sx9500_read_samp_freq(data, val, val2); > > + default: > > + return -EINVAL; > > + } > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int sx9500_set_samp_freq(struct sx9500_data *data, > > + int val, int val2) > > +{ > > + int i, ret; > > + > > + for (i = 0; i < ARRAY_SIZE(sx9500_samp_freq_table); i++) > > + if (val == sx9500_samp_freq_table[i].val && > > + val2 == sx9500_samp_freq_table[i].val2) > > + break; > > + > > + if (i == ARRAY_SIZE(sx9500_samp_freq_table)) > > + return -EINVAL; > > + > > + mutex_lock(&data->mutex); > > + > > + ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0, > > + SX9500_SCAN_PERIOD_MASK, > > + i << SX9500_SCAN_PERIOD_SHIFT); > > + > > + mutex_unlock(&data->mutex); > > + > > + return ret; > > +} > > + > > +static int sx9500_write_raw(struct iio_dev *indio_dev, > > + const struct iio_chan_spec *chan, > > + int val, int val2, long mask) > > +{ > > + struct sx9500_data *data = iio_priv(indio_dev); > > + > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + switch (mask) { > > + case IIO_CHAN_INFO_SAMP_FREQ: > > + return sx9500_set_samp_freq(data, val, val2); > > + default: > > + return -EINVAL; > > + } > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static irqreturn_t sx9500_irq_handler(int irq, void *private) > > +{ > > + struct iio_dev *indio_dev = private; > > + struct sx9500_data *data = iio_priv(indio_dev); > > + > > + if (data->trigger_enabled) > > + iio_trigger_poll(data->trig); > > + > > + /* > > + * Even if no event is enabled, we need to wake the thread to > > + * clear the interrupt state by reading SX9500_REG_IRQ_SRC. It > > + * is not possible to do that here because regmap_read takes a > > + * mutex. > > + */ > > + return IRQ_WAKE_THREAD; > > +} > > + > > +static irqreturn_t sx9500_irq_thread_handler(int irq, void *private) > > +{ > > + struct iio_dev *indio_dev = private; > > + struct sx9500_data *data = iio_priv(indio_dev); > > + int ret; > > + unsigned int val, chan; > > + > > + mutex_lock(&data->mutex); > > + > > + ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val); > > + if (ret < 0) { > > + dev_err(&data->client->dev, "i2c transfer error in irq\n"); > > + goto out; > > + } > > + > > + if (!(val & (SX9500_CLOSE_IRQ | SX9500_FAR_IRQ))) > > + goto out; > > + > > + ret = regmap_read(data->regmap, SX9500_REG_STAT, &val); > > + if (ret < 0) { > > + dev_err(&data->client->dev, "i2c transfer error in irq\n"); > > + goto out; > > + } > > + > > + val >>= SX9500_PROXSTAT_SHIFT; > > + for (chan = 0; chan < SX9500_NUM_CHANNELS; chan++) { > > + int dir; > > + u64 ev; > > + bool new_prox = val & BIT(chan); > > + > > + if (!data->event_enabled[chan]) > > + continue; > > + if (new_prox == data->prox_stat[chan]) > > + /* No change on this channel. */ > > + continue; > > + > > + dir = new_prox ? IIO_EV_DIR_FALLING : > > + IIO_EV_DIR_RISING; > > + ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, > > + chan, > > + IIO_EV_TYPE_THRESH, > > + dir); > > + iio_push_event(indio_dev, ev, iio_get_time_ns()); > > + data->prox_stat[chan] = new_prox; > > + } > > + > > +out: > > + mutex_unlock(&data->mutex); > > + > > + return IRQ_HANDLED; > > +} > > + > > +static int sx9500_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 sx9500_data *data = iio_priv(indio_dev); > > + > > + if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH || > > + dir != IIO_EV_DIR_EITHER) > > + return -EINVAL; > > + > > + return data->event_enabled[chan->channel]; > > +} > > + > > +static int sx9500_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 sx9500_data *data = iio_priv(indio_dev); > > + int ret, i; > > + bool any_active = false; > > + unsigned int irqmask; > > + > > + if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH || > > + dir != IIO_EV_DIR_EITHER) > > + return -EINVAL; > > + > > + mutex_lock(&data->mutex); > > + > > + data->event_enabled[chan->channel] = state; > > + > > + for (i = 0; i < SX9500_NUM_CHANNELS; i++) > > + if (data->event_enabled[i]) { > > + any_active = true; > > + break; > > + } > > + > > + irqmask = SX9500_CLOSE_IRQ | SX9500_FAR_IRQ; > > + if (any_active) > > + ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK, > > + irqmask, irqmask); > > + else > > + ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK, > > + irqmask, 0); > > + > > + mutex_unlock(&data->mutex); > > + > > + return ret; > > +} > > + > > +static int sx9500_update_scan_mode(struct iio_dev *indio_dev, > > + const unsigned long *scan_mask) > > +{ > > + struct sx9500_data *data = iio_priv(indio_dev); > > + > > + mutex_lock(&data->mutex); > > + kfree(data->buffer); > It's possible here that scan_bytes == 0 which gets us into undefined > teritory. Best check for that and set to null if it is 0. > > + data->buffer = kzalloc(indio_dev->scan_bytes, GFP_KERNEL); > > + mutex_unlock(&data->mutex); > > + > > + if (data->buffer == NULL) > > + return -ENOMEM; > > + > > + return 0; > > +} > > + > > +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( > > + "2.500000 3.333333 5 6.666666 8.333333 11.111111 16.666666 33.333333"); > > + > > +static struct attribute *sx9500_attributes[] = { > > + &iio_const_attr_sampling_frequency_available.dev_attr.attr, > > + NULL, > > +}; > > + > > +static const struct attribute_group sx9500_attribute_group = { > > + .attrs = sx9500_attributes, > > +}; > > + > > +static const struct iio_info sx9500_info = { > > + .driver_module = THIS_MODULE, > > + .attrs = &sx9500_attribute_group, > > + .read_raw = &sx9500_read_raw, > > + .write_raw = &sx9500_write_raw, > > + .read_event_config = &sx9500_read_event_config, > > + .write_event_config = &sx9500_write_event_config, > > + .update_scan_mode = &sx9500_update_scan_mode, > > +}; > > + > > +static int sx9500_set_trigger_state(struct iio_trigger *trig, > > + bool state) > > +{ > > + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); > > + struct sx9500_data *data = iio_priv(indio_dev); > > + int ret; > > + > > + mutex_lock(&data->mutex); > > + > > + ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK, > > + SX9500_CONVDONE_IRQ, > > + state ? SX9500_CONVDONE_IRQ : 0); > > + if (ret == 0) > > + data->trigger_enabled = state; > > + > > + mutex_unlock(&data->mutex); > > + > > + return ret; > > +} > > + > > +static const struct iio_trigger_ops sx9500_trigger_ops = { > > + .set_trigger_state = sx9500_set_trigger_state, > > + .owner = THIS_MODULE, > > +}; > > + > > +static irqreturn_t sx9500_trigger_handler(int irq, void *private) > > +{ > > + struct iio_poll_func *pf = private; > > + struct iio_dev *indio_dev = pf->indio_dev; > > + struct sx9500_data *data = iio_priv(indio_dev); > > + int val, bit, ret, i = 0; > > + > > + mutex_lock(&data->mutex); > > + > > + for_each_set_bit(bit, indio_dev->buffer->scan_mask, > > + indio_dev->masklength) { > > + ret = sx9500_read_proximity(data, &indio_dev->channels[bit], > > + &val); > > + if (ret < 0) > > + goto out; > > + > > + data->buffer[i++] = val; > > + } > > + > > + iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, > > + iio_get_time_ns()); > > + > > +out: > > + mutex_unlock(&data->mutex); > > + > > + iio_trigger_notify_done(indio_dev->trig); > > + > > + return IRQ_HANDLED; > > +} > > + > > +struct sx9500_reg_default { > > + u8 reg; > > + u8 def; > > +}; > > + > > +static const struct sx9500_reg_default sx9500_default_regs[] = { > > + { > > + .reg = SX9500_REG_PROX_CTRL1, > > + /* Shield enabled, small range. */ > > + .def = 0x43, > > + }, > > + { > > + .reg = SX9500_REG_PROX_CTRL2, > > + /* x8 gain, 167kHz frequency, finest resolution. */ > > + .def = 0x77, > > + }, > > + { > > + .reg = SX9500_REG_PROX_CTRL3, > > + /* Doze enabled, 2x scan period doze, no raw filter. */ > > + .def = 0x40, > > + }, > > + { > > + .reg = SX9500_REG_PROX_CTRL4, > > + /* Average threshold. */ > > + .def = 0x30, > > + }, > > + { > > + .reg = SX9500_REG_PROX_CTRL5, > > + /* > > + * Debouncer off, lowest average negative filter, > > + * highest average postive filter. > > + */ > > + .def = 0x0f, > > + }, > > + { > > + .reg = SX9500_REG_PROX_CTRL6, > > + /* Proximity detection threshold: 280 */ > > + .def = 0x0e, > > + }, > > + { > > + .reg = SX9500_REG_PROX_CTRL7, > > + /* > > + * No automatic compensation, compensate each pin > > + * independently, proximity hysteresis: 32, close > > + * debouncer off, far debouncer off. > > + */ > > + .def = 0x00, > > + }, > > + { > > + .reg = SX9500_REG_PROX_CTRL8, > > + /* No stuck timeout, no periodic compensation. */ > > + .def = 0x00, > > + }, > > + { > > + .reg = SX9500_REG_PROX_CTRL0, > > + /* Scan period: 30ms, all sensors enabled. */ > > + .def = 0x0f, > > + }, > > +}; > > + > > +static int sx9500_init_device(struct iio_dev *indio_dev) > > +{ > > + struct sx9500_data *data = iio_priv(indio_dev); > > + int ret, i; > > + unsigned int val; > > + > > + ret = regmap_write(data->regmap, SX9500_REG_IRQ_MSK, 0); > > + if (ret < 0) > > + return ret; > > + > > + ret = regmap_write(data->regmap, SX9500_REG_RESET, > > + SX9500_SOFT_RESET); > > + if (ret < 0) > > + return ret; > > + > > + ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val); > > + if (ret < 0) > > + return ret; > > + > > + for (i = 0; i < ARRAY_SIZE(sx9500_default_regs); i++) { > > + ret = regmap_write(data->regmap, > > + sx9500_default_regs[i].reg, > > + sx9500_default_regs[i].def); > > + if (ret < 0) > > + return ret; > > + } > > + > > + return 0; > > +} > > + > > +static int sx9500_gpio_probe(struct i2c_client *client, > > + struct sx9500_data *data) > > +{ > > + 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, SX9500_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 int sx9500_probe(struct i2c_client *client, > > + const struct i2c_device_id *id) > > +{ > > + int ret; > > + struct iio_dev *indio_dev; > > + struct sx9500_data *data; > > + > > + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); > > + if (indio_dev == NULL) > > + return -ENOMEM; > > + > > + data = iio_priv(indio_dev); > > + data->client = client; > > + mutex_init(&data->mutex); > > + data->trigger_enabled = false; > > + > > + data->regmap = devm_regmap_init_i2c(client, &sx9500_regmap_config); > > + if (IS_ERR(data->regmap)) > > + return PTR_ERR(data->regmap); > > + > > + sx9500_init_device(indio_dev); > > + > > + indio_dev->dev.parent = &client->dev; > > + indio_dev->name = SX9500_DRIVER_NAME; > > + indio_dev->channels = sx9500_channels; > > + indio_dev->num_channels = ARRAY_SIZE(sx9500_channels); > > + indio_dev->info = &sx9500_info; > > + indio_dev->modes = INDIO_DIRECT_MODE; > > + i2c_set_clientdata(client, indio_dev); > > + > > + if (client->irq <= 0) > > + client->irq = sx9500_gpio_probe(client, data); > > + > > + if (client->irq > 0) { > > + ret = devm_request_threaded_irq(&client->dev, client->irq, > > + sx9500_irq_handler, sx9500_irq_thread_handler, > > + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, > > + SX9500_IRQ_NAME, indio_dev); > > + if (ret < 0) > > + return ret; > > + > > + data->trig = devm_iio_trigger_alloc(&client->dev, > > + "%s-dev%d", indio_dev->name, indio_dev->id); > > + if (!data->trig) > > + return -ENOMEM; > > + > > + data->trig->dev.parent = &client->dev; > > + data->trig->ops = &sx9500_trigger_ops; > > + iio_trigger_set_drvdata(data->trig, indio_dev); > > + > > + ret = iio_trigger_register(data->trig); > > + if (ret) > > + return ret; > > + } > > + > > + ret = iio_triggered_buffer_setup(indio_dev, NULL, > > + sx9500_trigger_handler, NULL); > > + if (ret < 0) > > + goto out_trigger_unregister; > > + > > + ret = iio_device_register(indio_dev); > > + if (ret < 0) > > + goto out_buffer_cleanup; > > + > > + return 0; > > + > > +out_buffer_cleanup: > > + iio_triggered_buffer_cleanup(indio_dev); > > +out_trigger_unregister: > > + if (client->irq > 0) > > + iio_trigger_unregister(data->trig); > > + > > + return ret; > > +} > > + > > +static int sx9500_remove(struct i2c_client *client) > > +{ > > + struct iio_dev *indio_dev = i2c_get_clientdata(client); > > + struct sx9500_data *data = iio_priv(indio_dev); > > + > > + iio_device_unregister(indio_dev); > > + iio_triggered_buffer_cleanup(indio_dev); > > + if (client->irq > 0) > > + iio_trigger_unregister(data->trig); > > + kfree(data->buffer); > > + > > + return 0; > > +} > > + > > +static const struct acpi_device_id sx9500_acpi_match[] = { > > + {"SSX9500", 0}, > > + { }, > > +}; > > +MODULE_DEVICE_TABLE(acpi, sx9500_acpi_match); > > + > > +static const struct i2c_device_id sx9500_id[] = { > > + {"sx9500", 0}, > > + {} > > +}; > > +MODULE_DEVICE_TABLE(i2c, sx9500_id); > > + > > +static struct i2c_driver sx9500_driver = { > > + .driver = { > > + .name = SX9500_DRIVER_NAME, > > + .acpi_match_table = ACPI_PTR(sx9500_acpi_match), > > + }, > > + .probe = sx9500_probe, > > + .remove = sx9500_remove, > > + .id_table = sx9500_id, > > +}; > > +module_i2c_driver(sx9500_driver); > > + > > +MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@xxxxxxxxx>"); > > +MODULE_DESCRIPTION("Driver for Semtech SX9500 proximity sensor"); > > +MODULE_LICENSE("GPL v2"); > > > > -- > 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-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
