linux-kernel - [PATCH v8 6/7] i3c: master: sysfs key for acquire bus

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Date:   Sun, 31 May 2020 09:15:46 +0200
From:   Parshuram Thombare <pthombar@...ence.com>
To:     <bbrezillon@...nel.org>, <vitor.soares@...opsys.com>
CC:     <pgaj@...ence.com>, <linux-i3c@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <mparab@...ence.com>,
        <praneeth@...com>, Parshuram Thombare <pthombar@...ence.com>
Subject: [PATCH v8 6/7] i3c: master: sysfs key for acquire bus

Added support to acquire I3C bus through sysfs interface.

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

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index de3cb39df9ff..17c0c9a6099d 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -596,6 +596,23 @@ 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,
@@ -606,6 +623,7 @@ static struct attribute *i3c_masterdev_attrs[] = {
 	&dev_attr_pid.attr,
 	&dev_attr_dynamic_address.attr,
 	&dev_attr_hdrcap.attr,
+	&dev_attr_i3c_acquire_bus.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(i3c_masterdev);
-- 
2.17.1