[IIO_RESISTANCE] = "resistance",
[IIO_PH] = "ph",
[IIO_UVINDEX] = "uvindex",
+ [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
};
static const char * const iio_modifier_names[] = {
}
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;
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) {
*/
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]),
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;
projects / cascardo / linux.git / blobdiff