[PATCH v10 6/7] i3c: master: sysfs key for acquire bus

Parshuram Thombare
2020-11-30T06:21:34Z

Added support to acquire I3C bus through sysfs interface.

Signed-off-by: Parshuram Thombare <pthombar@cadence.com>
---
drivers/i3c/master.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index c01ba00..beb7495 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -581,6 +581,23 @@ static ssize_t i2c_scl_frequency_show(struct device *dev,
}
static DEVICE_ATTR_RO(i2c_scl_frequency);

+static ssize_t i3c_acquire_bus_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i3c_master_controller *master = dev_to_i3cmaster(dev);
+ int ret;
+
+ i3c_bus_normaluse_lock(&master->bus);
+ ret = i3c_master_acquire_bus(master);
+ i3c_bus_normaluse_unlock(&master->bus);
+ if (!ret)
+ i3c_master_enable_mr_events(master);
+
+ return ret ?: count;
+}
+static DEVICE_ATTR_WO(i3c_acquire_bus);
+
static struct attribute *i3c_masterdev_attrs[] = {
&dev_attr_mode.attr,
&dev_attr_current_master.attr,
@@ -591,6 +608,7 @@ static ssize_t i2c_scl_frequency_show(struct device *dev,
&dev_attr_pid.attr,
&dev_attr_dynamic_address.attr,
&dev_attr_hdrcap.attr,
+ &dev_attr_i3c_acquire_bus.attr,
NULL,
};
ATTRIBUTE_GROUPS(i3c_masterdev);
--
1.7.1