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authorGwendal Grignou <gwendal@chromium.org>2018-02-21 16:11:09 +0100
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2018-03-03 15:02:58 +0000
commit0dad1eceeb9c7497e7e2a592900ddac79b128c56 (patch)
tree6a1f397e17e73163e41166a651fa2c1a0cbad7d4 /drivers/iio/common
parent6de543e31d187a6cc4944c76b6234aa1c8f79383 (diff)
downloadlinux-0dad1eceeb9c7497e7e2a592900ddac79b128c56.tar.bz2
iio: cros_ec: Relax sampling frequency before suspending
If an application set a tight sampling frequency, given the interrupt use is a wakeup source, suspend will not happen: the kernel will receive a wake up interrupt and will cancel the suspend process. Given cros_ec sensors type is non wake up, this patch adds prepare and complete callbacks to set 1s sampling period just before suspend. This ensures the sensor hub will not be a source of interrupt during the suspend process. Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/common')
-rw-r--r--drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c1
-rw-r--r--drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c49
-rw-r--r--drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.h2
3 files changed, 52 insertions, 0 deletions
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
index 7d30c59da3e2..705cb3e72663 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
@@ -289,6 +289,7 @@ MODULE_DEVICE_TABLE(platform, cros_ec_sensors_ids);
static struct platform_driver cros_ec_sensors_platform_driver = {
.driver = {
.name = "cros-ec-sensors",
+ .pm = &cros_ec_sensors_pm_ops,
},
.probe = cros_ec_sensors_probe,
.id_table = cros_ec_sensors_ids,
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
index 416cae5ebbd0..a620eb5ce202 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
@@ -446,5 +446,54 @@ int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state *st,
}
EXPORT_SYMBOL_GPL(cros_ec_sensors_core_write);
+static int __maybe_unused cros_ec_sensors_prepare(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+
+ if (st->curr_sampl_freq == 0)
+ return 0;
+
+ /*
+ * If the sensors are sampled at high frequency, we will not be able to
+ * sleep. Set sampling to a long period if necessary.
+ */
+ if (st->curr_sampl_freq < CROS_EC_MIN_SUSPEND_SAMPLING_FREQUENCY) {
+ mutex_lock(&st->cmd_lock);
+ st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
+ st->param.ec_rate.data = CROS_EC_MIN_SUSPEND_SAMPLING_FREQUENCY;
+ cros_ec_motion_send_host_cmd(st, 0);
+ mutex_unlock(&st->cmd_lock);
+ }
+ return 0;
+}
+
+static void __maybe_unused cros_ec_sensors_complete(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+
+ if (st->curr_sampl_freq == 0)
+ return;
+
+ if (st->curr_sampl_freq < CROS_EC_MIN_SUSPEND_SAMPLING_FREQUENCY) {
+ mutex_lock(&st->cmd_lock);
+ st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
+ st->param.ec_rate.data = st->curr_sampl_freq;
+ cros_ec_motion_send_host_cmd(st, 0);
+ mutex_unlock(&st->cmd_lock);
+ }
+}
+
+const struct dev_pm_ops cros_ec_sensors_pm_ops = {
+#ifdef CONFIG_PM_SLEEP
+ .prepare = cros_ec_sensors_prepare,
+ .complete = cros_ec_sensors_complete
+#endif
+};
+EXPORT_SYMBOL_GPL(cros_ec_sensors_pm_ops);
+
MODULE_DESCRIPTION("ChromeOS EC sensor hub core functions");
MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.h b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.h
index 8bc2ca3c2e2e..2edf68dc7336 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.h
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.h
@@ -169,6 +169,8 @@ int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state *st,
struct iio_chan_spec const *chan,
int val, int val2, long mask);
+extern const struct dev_pm_ops cros_ec_sensors_pm_ops;
+
/* List of extended channel specification for all sensors */
extern const struct iio_chan_spec_ext_info cros_ec_sensors_ext_info[];