diff options
Diffstat (limited to 'drivers/iio/industrialio-core.c')
| -rw-r--r-- | drivers/iio/industrialio-core.c | 179 |
1 files changed, 175 insertions, 4 deletions
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 2a85bd888619..f914d5d140e4 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -178,6 +178,86 @@ ssize_t iio_read_const_attr(struct device *dev, } EXPORT_SYMBOL(iio_read_const_attr); +static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id) +{ + int ret; + const struct iio_event_interface *ev_int = indio_dev->event_interface; + + ret = mutex_lock_interruptible(&indio_dev->mlock); + if (ret) + return ret; + if ((ev_int && iio_event_enabled(ev_int)) || + iio_buffer_enabled(indio_dev)) { + mutex_unlock(&indio_dev->mlock); + return -EBUSY; + } + indio_dev->clock_id = clock_id; + mutex_unlock(&indio_dev->mlock); + + return 0; +} + +/** + * iio_get_time_ns() - utility function to get a time stamp for events etc + * @indio_dev: device + */ +s64 iio_get_time_ns(const struct iio_dev *indio_dev) +{ + struct timespec tp; + + switch (iio_device_get_clock(indio_dev)) { + case CLOCK_REALTIME: + ktime_get_real_ts(&tp); + break; + case CLOCK_MONOTONIC: + ktime_get_ts(&tp); + break; + case CLOCK_MONOTONIC_RAW: + getrawmonotonic(&tp); + break; + case CLOCK_REALTIME_COARSE: + tp = current_kernel_time(); + break; + case CLOCK_MONOTONIC_COARSE: + tp = get_monotonic_coarse(); + break; + case CLOCK_BOOTTIME: + get_monotonic_boottime(&tp); + break; + case CLOCK_TAI: + timekeeping_clocktai(&tp); + break; + default: + BUG(); + } + + return timespec_to_ns(&tp); +} +EXPORT_SYMBOL(iio_get_time_ns); + +/** + * iio_get_time_res() - utility function to get time stamp clock resolution in + * nano seconds. + * @indio_dev: device + */ +unsigned int iio_get_time_res(const struct iio_dev *indio_dev) +{ + switch (iio_device_get_clock(indio_dev)) { + case CLOCK_REALTIME: + case CLOCK_MONOTONIC: + case CLOCK_MONOTONIC_RAW: + case CLOCK_BOOTTIME: + case CLOCK_TAI: + return hrtimer_resolution; + case CLOCK_REALTIME_COARSE: + case CLOCK_MONOTONIC_COARSE: + return LOW_RES_NSEC; + default: + BUG(); + } +} +EXPORT_SYMBOL(iio_get_time_res); + static int __init iio_init(void) { int ret; @@ -990,11 +1070,91 @@ static ssize_t iio_show_dev_name(struct device *dev, static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); +static ssize_t iio_show_timestamp_clock(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + const struct iio_dev *indio_dev = dev_to_iio_dev(dev); + const clockid_t clk = iio_device_get_clock(indio_dev); + const char *name; + ssize_t sz; + + switch (clk) { + case CLOCK_REALTIME: + name = "realtime\n"; + sz = sizeof("realtime\n"); + break; + case CLOCK_MONOTONIC: + name = "monotonic\n"; + sz = sizeof("monotonic\n"); + break; + case CLOCK_MONOTONIC_RAW: + name = "monotonic_raw\n"; + sz = sizeof("monotonic_raw\n"); + break; + case CLOCK_REALTIME_COARSE: + name = "realtime_coarse\n"; + sz = sizeof("realtime_coarse\n"); + break; + case CLOCK_MONOTONIC_COARSE: + name = "monotonic_coarse\n"; + sz = sizeof("monotonic_coarse\n"); + break; + case CLOCK_BOOTTIME: + name = "boottime\n"; + sz = sizeof("boottime\n"); + break; + case CLOCK_TAI: + name = "tai\n"; + sz = sizeof("tai\n"); + break; + default: + BUG(); + } + + memcpy(buf, name, sz); + return sz; +} + +static ssize_t iio_store_timestamp_clock(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + clockid_t clk; + int ret; + + if (sysfs_streq(buf, "realtime")) + clk = CLOCK_REALTIME; + else if (sysfs_streq(buf, "monotonic")) + clk = CLOCK_MONOTONIC; + else if (sysfs_streq(buf, "monotonic_raw")) + clk = CLOCK_MONOTONIC_RAW; + else if (sysfs_streq(buf, "realtime_coarse")) + clk = CLOCK_REALTIME_COARSE; + else if (sysfs_streq(buf, "monotonic_coarse")) + clk = CLOCK_MONOTONIC_COARSE; + else if (sysfs_streq(buf, "boottime")) + clk = CLOCK_BOOTTIME; + else if (sysfs_streq(buf, "tai")) + clk = CLOCK_TAI; + else + return -EINVAL; + + ret = iio_device_set_clock(dev_to_iio_dev(dev), clk); + if (ret) + return ret; + + return len; +} + +static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR, + iio_show_timestamp_clock, iio_store_timestamp_clock); + static int iio_device_register_sysfs(struct iio_dev *indio_dev) { int i, ret = 0, attrcount, attrn, attrcount_orig = 0; struct iio_dev_attr *p; - struct attribute **attr; + struct attribute **attr, *clk = NULL; /* First count elements in any existing group */ if (indio_dev->info->attrs) { @@ -1009,16 +1169,25 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev) */ if (indio_dev->channels) for (i = 0; i < indio_dev->num_channels; i++) { - ret = iio_device_add_channel_sysfs(indio_dev, - &indio_dev - ->channels[i]); + const struct iio_chan_spec *chan = + &indio_dev->channels[i]; + + if (chan->type == IIO_TIMESTAMP) + clk = &dev_attr_current_timestamp_clock.attr; + + ret = iio_device_add_channel_sysfs(indio_dev, chan); if (ret < 0) goto error_clear_attrs; attrcount += ret; } + if (indio_dev->event_interface) + clk = &dev_attr_current_timestamp_clock.attr; + if (indio_dev->name) attrcount++; + if (clk) + attrcount++; indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, sizeof(indio_dev->chan_attr_group.attrs[0]), @@ -1039,6 +1208,8 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev) indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; if (indio_dev->name) indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; + if (clk) + indio_dev->chan_attr_group.attrs[attrn++] = clk; indio_dev->groups[indio_dev->groupcounter++] = &indio_dev->chan_attr_group; |